drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <linux/bsg-lib.h>
  27 #include <linux/idr.h>
  28 #include <net/tcp.h>
  29 #include <scsi/scsi.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_iscsi.h>
  34 #include <scsi/iscsi_if.h>
  35 #include <scsi/scsi_cmnd.h>
  36 #include <scsi/scsi_bsg_iscsi.h>
  37
  38 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  39
  40 static int dbg_session;
  41 module_param_named(debug_session, dbg_session, int,
  42                    S_IRUGO | S_IWUSR);
  43 MODULE_PARM_DESC(debug_session,
  44                  "Turn on debugging for sessions in scsi_transport_iscsi "
  45                  "module. Set to 1 to turn on, and zero to turn off. Default "
  46                  "is off.");
  47
  48 static int dbg_conn;
  49 module_param_named(debug_conn, dbg_conn, int,
  50                    S_IRUGO | S_IWUSR);
  51 MODULE_PARM_DESC(debug_conn,
  52                  "Turn on debugging for connections in scsi_transport_iscsi "
  53                  "module. Set to 1 to turn on, and zero to turn off. Default "
  54                  "is off.");
  55
  56 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  57         do {                                                            \
  58                 if (dbg_session)                                        \
  59                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  60                                                  "%s: " dbg_fmt,        \
  61                                                  __func__, ##arg);      \
  62         } while (0);
  63
  64 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  65         do {                                                            \
  66                 if (dbg_conn)                                           \
  67                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  68                                               "%s: " dbg_fmt,           \
  69                                               __func__, ##arg); \
  70         } while (0);
  71
  72 struct iscsi_internal {
  73         struct scsi_transport_template t;
  74         struct iscsi_transport *iscsi_transport;
  75         struct list_head list;
  76         struct device dev;
  77
  78         struct transport_container conn_cont;
  79         struct transport_container session_cont;
  80 };
  81
  82 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  83 static struct workqueue_struct *iscsi_eh_timer_workq;
  84
  85 static DEFINE_IDA(iscsi_sess_ida);
  86 /*
  87  * list of registered transports and lock that must
  88  * be held while accessing list. The iscsi_transport_lock must
  89  * be acquired after the rx_queue_mutex.
  90  */
  91 static LIST_HEAD(iscsi_transports);
  92 static DEFINE_SPINLOCK(iscsi_transport_lock);
  93
  94 #define to_iscsi_internal(tmpl) \
  95         container_of(tmpl, struct iscsi_internal, t)
  96
  97 #define dev_to_iscsi_internal(_dev) \
  98         container_of(_dev, struct iscsi_internal, dev)
  99
 100 static void iscsi_transport_release(struct device *dev)
 101 {
 102         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 103         kfree(priv);
 104 }
 105
 106 /*
 107  * iscsi_transport_class represents the iscsi_transports that are
 108  * registered.
 109  */
 110 static struct class iscsi_transport_class = {
 111         .name = "iscsi_transport",
 112         .dev_release = iscsi_transport_release,
 113 };
 114
 115 static ssize_t
 116 show_transport_handle(struct device *dev, struct device_attribute *attr,
 117                       char *buf)
 118 {
 119         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 120         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 121 }
 122 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 123
 124 #define show_transport_attr(name, format)                               \
 125 static ssize_t                                                          \
 126 show_transport_##name(struct device *dev,                               \
 127                       struct device_attribute *attr,char *buf)          \
 128 {                                                                       \
 129         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 130         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 131 }                                                                       \
 132 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 133
 134 show_transport_attr(caps, "0x%x");
 135
 136 static struct attribute *iscsi_transport_attrs[] = {
 137         &dev_attr_handle.attr,
 138         &dev_attr_caps.attr,
 139         NULL,
 140 };
 141
 142 static struct attribute_group iscsi_transport_group = {
 143         .attrs = iscsi_transport_attrs,
 144 };
 145
 146 /*
 147  * iSCSI endpoint attrs
 148  */
 149 #define iscsi_dev_to_endpoint(_dev) \
 150         container_of(_dev, struct iscsi_endpoint, dev)
 151
 152 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 153 struct device_attribute dev_attr_##_prefix##_##_name =  \
 154         __ATTR(_name,_mode,_show,_store)
 155
 156 static void iscsi_endpoint_release(struct device *dev)
 157 {
 158         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 159         kfree(ep);
 160 }
 161
 162 static struct class iscsi_endpoint_class = {
 163         .name = "iscsi_endpoint",
 164         .dev_release = iscsi_endpoint_release,
 165 };
 166
 167 static ssize_t
 168 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 169 {
 170         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 171         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 172 }
 173 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 174
 175 static struct attribute *iscsi_endpoint_attrs[] = {
 176         &dev_attr_ep_handle.attr,
 177         NULL,
 178 };
 179
 180 static struct attribute_group iscsi_endpoint_group = {
 181         .attrs = iscsi_endpoint_attrs,
 182 };
 183
 184 #define ISCSI_MAX_EPID -1
 185
 186 static int iscsi_match_epid(struct device *dev, const void *data)
 187 {
 188         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 189         const uint64_t *epid = data;
 190
 191         return *epid == ep->id;
 192 }
 193
 194 struct iscsi_endpoint *
 195 iscsi_create_endpoint(int dd_size)
 196 {
 197         struct device *dev;
 198         struct iscsi_endpoint *ep;
 199         uint64_t id;
 200         int err;
 201
 202         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 203                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 204                                         iscsi_match_epid);
 205                 if (!dev)
 206                         break;
 207                 else
 208                         put_device(dev);
 209         }
 210         if (id == ISCSI_MAX_EPID) {
 211                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 212                        ISCSI_MAX_EPID - 1);
 213                 return NULL;
 214         }
 215
 216         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 217         if (!ep)
 218                 return NULL;
 219
 220         ep->id = id;
 221         ep->dev.class = &iscsi_endpoint_class;
 222         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 223         err = device_register(&ep->dev);
 224         if (err)
 225                 goto free_ep;
 226
 227         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 228         if (err)
 229                 goto unregister_dev;
 230
 231         if (dd_size)
 232                 ep->dd_data = &ep[1];
 233         return ep;
 234
 235 unregister_dev:
 236         device_unregister(&ep->dev);
 237         return NULL;
 238
 239 free_ep:
 240         kfree(ep);
 241         return NULL;
 242 }
 243 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 244
 245 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 246 {
 247         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 248         device_unregister(&ep->dev);
 249 }
 250 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 251
 252 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 253 {
 254         struct iscsi_endpoint *ep;
 255         struct device *dev;
 256
 257         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 258                                 iscsi_match_epid);
 259         if (!dev)
 260                 return NULL;
 261
 262         ep = iscsi_dev_to_endpoint(dev);
 263         /*
 264          * we can drop this now because the interface will prevent
 265          * removals and lookups from racing.
 266          */
 267         put_device(dev);
 268         return ep;
 269 }
 270 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 271
 272 /*
 273  * Interface to display network param to sysfs
 274  */
 275
 276 static void iscsi_iface_release(struct device *dev)
 277 {
 278         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 279         struct device *parent = iface->dev.parent;
 280
 281         kfree(iface);
 282         put_device(parent);
 283 }
 284
 285
 286 static struct class iscsi_iface_class = {
 287         .name = "iscsi_iface",
 288         .dev_release = iscsi_iface_release,
 289 };
 290
 291 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 292 struct device_attribute dev_attr_##_prefix##_##_name =          \
 293         __ATTR(_name, _mode, _show, _store)
 294
 295 /* iface attrs show */
 296 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 297 static ssize_t                                                          \
 298 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 299                      char *buf)                                         \
 300 {                                                                       \
 301         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 302         struct iscsi_transport *t = iface->transport;                   \
 303         return t->get_iface_param(iface, param_type, param, buf);       \
 304 }                                                                       \
 305
 306 #define iscsi_iface_net_attr(type, name, param)                         \
 307         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 308 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 309
 310 #define iscsi_iface_attr(type, name, param)                             \
 311         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 312 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 313
 314 /* generic read only ipv4 attribute */
 315 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 316 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 317 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 318 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 319 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 320                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 321 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 322                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 323 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 324 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 325 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 326                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 327 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 328                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 329 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 330                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 331 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 332                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 333 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 334                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 335 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 336                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 337 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 338                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 339 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 340                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 341 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 342                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 343 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 344
 345 /* generic read only ipv6 attribute */
 346 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 347 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 348                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 349 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 350 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 351                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 352 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 353                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 354 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 355                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 356 iscsi_iface_net_attr(ipv6_iface, router_state,
 357                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 358 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 359                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 360 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 361 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 362 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 363                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 364 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 365 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 366                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 367 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 368                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 369 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 370                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 371 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 372                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 373 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 374                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 375
 376 /* common read only iface attribute */
 377 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 378 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 379 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 380 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 381 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 382 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 383 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 384 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 385 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 386                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 387 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 388 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 389 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 390 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 391 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 392 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 393
 394 /* common iscsi specific settings attributes */
 395 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 396 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 397 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 398 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 399 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 400 iscsi_iface_attr(iface, data_seq_in_order,
 401                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 402 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 403 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 404 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 405 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 406 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 407 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 408 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 409 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 410 iscsi_iface_attr(iface, discovery_auth_optional,
 411                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 412 iscsi_iface_attr(iface, discovery_logout,
 413                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 414 iscsi_iface_attr(iface, strict_login_comp_en,
 415                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 416 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 417
 418 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 419                                           struct attribute *attr, int i)
 420 {
 421         struct device *dev = container_of(kobj, struct device, kobj);
 422         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 423         struct iscsi_transport *t = iface->transport;
 424         int param;
 425         int param_type;
 426
 427         if (attr == &dev_attr_iface_enabled.attr)
 428                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 429         else if (attr == &dev_attr_iface_vlan_id.attr)
 430                 param = ISCSI_NET_PARAM_VLAN_ID;
 431         else if (attr == &dev_attr_iface_vlan_priority.attr)
 432                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 433         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 434                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 435         else if (attr == &dev_attr_iface_mtu.attr)
 436                 param = ISCSI_NET_PARAM_MTU;
 437         else if (attr == &dev_attr_iface_port.attr)
 438                 param = ISCSI_NET_PARAM_PORT;
 439         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 440                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 441         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 442                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 443         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 444                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 445         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 446                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 447         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 448                 param = ISCSI_NET_PARAM_TCP_WSF;
 449         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 450                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 451         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 452                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 453         else if (attr == &dev_attr_iface_cache_id.attr)
 454                 param = ISCSI_NET_PARAM_CACHE_ID;
 455         else if (attr == &dev_attr_iface_redirect_en.attr)
 456                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 457         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 458                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 459         else if (attr == &dev_attr_iface_header_digest.attr)
 460                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 461         else if (attr == &dev_attr_iface_data_digest.attr)
 462                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 463         else if (attr == &dev_attr_iface_immediate_data.attr)
 464                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 465         else if (attr == &dev_attr_iface_initial_r2t.attr)
 466                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 467         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 468                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 469         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 470                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 471         else if (attr == &dev_attr_iface_erl.attr)
 472                 param = ISCSI_IFACE_PARAM_ERL;
 473         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 474                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 475         else if (attr == &dev_attr_iface_first_burst_len.attr)
 476                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 477         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 478                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 479         else if (attr == &dev_attr_iface_max_burst_len.attr)
 480                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 481         else if (attr == &dev_attr_iface_chap_auth.attr)
 482                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 483         else if (attr == &dev_attr_iface_bidi_chap.attr)
 484                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 485         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 486                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 487         else if (attr == &dev_attr_iface_discovery_logout.attr)
 488                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 489         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 490                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 491         else if (attr == &dev_attr_iface_initiator_name.attr)
 492                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 493         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 494                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 495                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 496                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 497                         param = ISCSI_NET_PARAM_IPV4_GW;
 498                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 499                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 500                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 501                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 502                 else if (attr ==
 503                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 504                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 505                 else if (attr ==
 506                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 507                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 508                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 509                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 510                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 511                         param = ISCSI_NET_PARAM_IPV4_TOS;
 512                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 513                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 514                 else if (attr ==
 515                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 517                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 519                 else if (attr ==
 520                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 521                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 522                 else if (attr ==
 523                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 524                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 525                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 526                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 527                 else if (attr ==
 528                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 529                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 530                 else if (attr ==
 531                          &dev_attr_ipv4_iface_fragment_disable.attr)
 532                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 533                 else if (attr ==
 534                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 535                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 536                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_TTL;
 538                 else
 539                         return 0;
 540         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 541                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 542                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 543                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 544                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 545                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 546                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 547                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 548                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 549                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 550                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 551                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 552                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 553                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 554                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 555                 else if (attr ==
 556                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 557                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 558                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 559                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 560                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 561                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 562                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 563                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 564                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 565                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 566                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 567                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 568                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 569                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 570                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 571                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 572                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 573                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 574                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 575                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 576                 else
 577                         return 0;
 578         } else {
 579                 WARN_ONCE(1, "Invalid iface attr");
 580                 return 0;
 581         }
 582
 583         switch (param) {
 584         case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
 585         case ISCSI_IFACE_PARAM_HDRDGST_EN:
 586         case ISCSI_IFACE_PARAM_DATADGST_EN:
 587         case ISCSI_IFACE_PARAM_IMM_DATA_EN:
 588         case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
 589         case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
 590         case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
 591         case ISCSI_IFACE_PARAM_ERL:
 592         case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
 593         case ISCSI_IFACE_PARAM_FIRST_BURST:
 594         case ISCSI_IFACE_PARAM_MAX_R2T:
 595         case ISCSI_IFACE_PARAM_MAX_BURST:
 596         case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
 597         case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
 598         case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
 599         case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
 600         case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
 601         case ISCSI_IFACE_PARAM_INITIATOR_NAME:
 602                 param_type = ISCSI_IFACE_PARAM;
 603                 break;
 604         default:
 605                 param_type = ISCSI_NET_PARAM;
 606         }
 607
 608         return t->attr_is_visible(param_type, param);
 609 }
 610
 611 static struct attribute *iscsi_iface_attrs[] = {
 612         &dev_attr_iface_enabled.attr,
 613         &dev_attr_iface_vlan_id.attr,
 614         &dev_attr_iface_vlan_priority.attr,
 615         &dev_attr_iface_vlan_enabled.attr,
 616         &dev_attr_ipv4_iface_ipaddress.attr,
 617         &dev_attr_ipv4_iface_gateway.attr,
 618         &dev_attr_ipv4_iface_subnet.attr,
 619         &dev_attr_ipv4_iface_bootproto.attr,
 620         &dev_attr_ipv6_iface_ipaddress.attr,
 621         &dev_attr_ipv6_iface_link_local_addr.attr,
 622         &dev_attr_ipv6_iface_router_addr.attr,
 623         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 624         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 625         &dev_attr_iface_mtu.attr,
 626         &dev_attr_iface_port.attr,
 627         &dev_attr_iface_ipaddress_state.attr,
 628         &dev_attr_iface_delayed_ack_en.attr,
 629         &dev_attr_iface_tcp_nagle_disable.attr,
 630         &dev_attr_iface_tcp_wsf_disable.attr,
 631         &dev_attr_iface_tcp_wsf.attr,
 632         &dev_attr_iface_tcp_timer_scale.attr,
 633         &dev_attr_iface_tcp_timestamp_en.attr,
 634         &dev_attr_iface_cache_id.attr,
 635         &dev_attr_iface_redirect_en.attr,
 636         &dev_attr_iface_def_taskmgmt_tmo.attr,
 637         &dev_attr_iface_header_digest.attr,
 638         &dev_attr_iface_data_digest.attr,
 639         &dev_attr_iface_immediate_data.attr,
 640         &dev_attr_iface_initial_r2t.attr,
 641         &dev_attr_iface_data_seq_in_order.attr,
 642         &dev_attr_iface_data_pdu_in_order.attr,
 643         &dev_attr_iface_erl.attr,
 644         &dev_attr_iface_max_recv_dlength.attr,
 645         &dev_attr_iface_first_burst_len.attr,
 646         &dev_attr_iface_max_outstanding_r2t.attr,
 647         &dev_attr_iface_max_burst_len.attr,
 648         &dev_attr_iface_chap_auth.attr,
 649         &dev_attr_iface_bidi_chap.attr,
 650         &dev_attr_iface_discovery_auth_optional.attr,
 651         &dev_attr_iface_discovery_logout.attr,
 652         &dev_attr_iface_strict_login_comp_en.attr,
 653         &dev_attr_iface_initiator_name.attr,
 654         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 655         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 656         &dev_attr_ipv4_iface_tos_en.attr,
 657         &dev_attr_ipv4_iface_tos.attr,
 658         &dev_attr_ipv4_iface_grat_arp_en.attr,
 659         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 660         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 661         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 662         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 663         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 664         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 665         &dev_attr_ipv4_iface_fragment_disable.attr,
 666         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 667         &dev_attr_ipv4_iface_ttl.attr,
 668         &dev_attr_ipv6_iface_link_local_state.attr,
 669         &dev_attr_ipv6_iface_router_state.attr,
 670         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 671         &dev_attr_ipv6_iface_mld_en.attr,
 672         &dev_attr_ipv6_iface_flow_label.attr,
 673         &dev_attr_ipv6_iface_traffic_class.attr,
 674         &dev_attr_ipv6_iface_hop_limit.attr,
 675         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 676         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 677         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 678         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 679         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 680         NULL,
 681 };
 682
 683 static struct attribute_group iscsi_iface_group = {
 684         .attrs = iscsi_iface_attrs,
 685         .is_visible = iscsi_iface_attr_is_visible,
 686 };
 687
 688 /* convert iscsi_ipaddress_state values to ascii string name */
 689 static const struct {
 690         enum iscsi_ipaddress_state      value;
 691         char                            *name;
 692 } iscsi_ipaddress_state_names[] = {
 693         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 694         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 695         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 696         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 697         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 698         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 699         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 700 };
 701
 702 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 703 {
 704         int i;
 705         char *state = NULL;
 706
 707         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 708                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 709                         state = iscsi_ipaddress_state_names[i].name;
 710                         break;
 711                 }
 712         }
 713         return state;
 714 }
 715 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 716
 717 /* convert iscsi_router_state values to ascii string name */
 718 static const struct {
 719         enum iscsi_router_state value;
 720         char                    *name;
 721 } iscsi_router_state_names[] = {
 722         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 723         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 724         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 725         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 726 };
 727
 728 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 729 {
 730         int i;
 731         char *state = NULL;
 732
 733         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 734                 if (iscsi_router_state_names[i].value == router_state) {
 735                         state = iscsi_router_state_names[i].name;
 736                         break;
 737                 }
 738         }
 739         return state;
 740 }
 741 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 742
 743 struct iscsi_iface *
 744 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 745                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 746 {
 747         struct iscsi_iface *iface;
 748         int err;
 749
 750         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 751         if (!iface)
 752                 return NULL;
 753
 754         iface->transport = transport;
 755         iface->iface_type = iface_type;
 756         iface->iface_num = iface_num;
 757         iface->dev.release = iscsi_iface_release;
 758         iface->dev.class = &iscsi_iface_class;
 759         /* parent reference released in iscsi_iface_release */
 760         iface->dev.parent = get_device(&shost->shost_gendev);
 761         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 762                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 763                              iface_num);
 764         else
 765                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 766                              iface_num);
 767
 768         err = device_register(&iface->dev);
 769         if (err)
 770                 goto free_iface;
 771
 772         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 773         if (err)
 774                 goto unreg_iface;
 775
 776         if (dd_size)
 777                 iface->dd_data = &iface[1];
 778         return iface;
 779
 780 unreg_iface:
 781         device_unregister(&iface->dev);
 782         return NULL;
 783
 784 free_iface:
 785         put_device(iface->dev.parent);
 786         kfree(iface);
 787         return NULL;
 788 }
 789 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 790
 791 void iscsi_destroy_iface(struct iscsi_iface *iface)
 792 {
 793         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 794         device_unregister(&iface->dev);
 795 }
 796 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 797
 798 /*
 799  * Interface to display flash node params to sysfs
 800  */
 801
 802 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 803 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 804         __ATTR(_name, _mode, _show, _store)
 805
 806 /* flash node session attrs show */
 807 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 808 static ssize_t                                                          \
 809 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 810                      char *buf)                                         \
 811 {                                                                       \
 812         struct iscsi_bus_flash_session *fnode_sess =                    \
 813                                         iscsi_dev_to_flash_session(dev);\
 814         struct iscsi_transport *t = fnode_sess->transport;              \
 815         return t->get_flashnode_param(fnode_sess, param, buf);          \
 816 }                                                                       \
 817
 818
 819 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 820         iscsi_flashnode_sess_attr_show(type, name, param)               \
 821 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 822                             show_##type##_##name, NULL);
 823
 824 /* Flash node session attributes */
 825
 826 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 827                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 828 iscsi_flashnode_sess_attr(fnode, discovery_session,
 829                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 830 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 831 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 832 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 833 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 834 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 835                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 836 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 837                           ISCSI_FLASHNODE_PDU_INORDER);
 838 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 839 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 840                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 841 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 842 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 843                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 844 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 845 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 846 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 847 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 848                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 849 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 850 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 851 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 852 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 853 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 854                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 855 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 856 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 857 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 858 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 859                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 860 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 861                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 862 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 863 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 864 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 865 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 866 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 867 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 868 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 869
 870 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 871         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 872         &dev_attr_fnode_discovery_session.attr,
 873         &dev_attr_fnode_portal_type.attr,
 874         &dev_attr_fnode_entry_enable.attr,
 875         &dev_attr_fnode_immediate_data.attr,
 876         &dev_attr_fnode_initial_r2t.attr,
 877         &dev_attr_fnode_data_seq_in_order.attr,
 878         &dev_attr_fnode_data_pdu_in_order.attr,
 879         &dev_attr_fnode_chap_auth.attr,
 880         &dev_attr_fnode_discovery_logout.attr,
 881         &dev_attr_fnode_bidi_chap.attr,
 882         &dev_attr_fnode_discovery_auth_optional.attr,
 883         &dev_attr_fnode_erl.attr,
 884         &dev_attr_fnode_first_burst_len.attr,
 885         &dev_attr_fnode_def_time2wait.attr,
 886         &dev_attr_fnode_def_time2retain.attr,
 887         &dev_attr_fnode_max_outstanding_r2t.attr,
 888         &dev_attr_fnode_isid.attr,
 889         &dev_attr_fnode_tsid.attr,
 890         &dev_attr_fnode_max_burst_len.attr,
 891         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 892         &dev_attr_fnode_targetalias.attr,
 893         &dev_attr_fnode_targetname.attr,
 894         &dev_attr_fnode_tpgt.attr,
 895         &dev_attr_fnode_discovery_parent_idx.attr,
 896         &dev_attr_fnode_discovery_parent_type.attr,
 897         &dev_attr_fnode_chap_in_idx.attr,
 898         &dev_attr_fnode_chap_out_idx.attr,
 899         &dev_attr_fnode_username.attr,
 900         &dev_attr_fnode_username_in.attr,
 901         &dev_attr_fnode_password.attr,
 902         &dev_attr_fnode_password_in.attr,
 903         &dev_attr_fnode_is_boot_target.attr,
 904         NULL,
 905 };
 906
 907 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 908                                                     struct attribute *attr,
 909                                                     int i)
 910 {
 911         struct device *dev = container_of(kobj, struct device, kobj);
 912         struct iscsi_bus_flash_session *fnode_sess =
 913                                                 iscsi_dev_to_flash_session(dev);
 914         struct iscsi_transport *t = fnode_sess->transport;
 915         int param;
 916
 917         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 918                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 919         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 920                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 921         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 922                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 923         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 924                 param = ISCSI_FLASHNODE_ENTRY_EN;
 925         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 926                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 927         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 928                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 929         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 930                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 931         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 932                 param = ISCSI_FLASHNODE_PDU_INORDER;
 933         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 934                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 935         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 936                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 937         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 938                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 939         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 940                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 941         } else if (attr == &dev_attr_fnode_erl.attr) {
 942                 param = ISCSI_FLASHNODE_ERL;
 943         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 944                 param = ISCSI_FLASHNODE_FIRST_BURST;
 945         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 946                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 947         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 948                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 949         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 950                 param = ISCSI_FLASHNODE_MAX_R2T;
 951         } else if (attr == &dev_attr_fnode_isid.attr) {
 952                 param = ISCSI_FLASHNODE_ISID;
 953         } else if (attr == &dev_attr_fnode_tsid.attr) {
 954                 param = ISCSI_FLASHNODE_TSID;
 955         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 956                 param = ISCSI_FLASHNODE_MAX_BURST;
 957         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 958                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 959         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 960                 param = ISCSI_FLASHNODE_ALIAS;
 961         } else if (attr == &dev_attr_fnode_targetname.attr) {
 962                 param = ISCSI_FLASHNODE_NAME;
 963         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 964                 param = ISCSI_FLASHNODE_TPGT;
 965         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 966                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 967         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 968                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 969         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 970                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 971         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 972                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 973         } else if (attr == &dev_attr_fnode_username.attr) {
 974                 param = ISCSI_FLASHNODE_USERNAME;
 975         } else if (attr == &dev_attr_fnode_username_in.attr) {
 976                 param = ISCSI_FLASHNODE_USERNAME_IN;
 977         } else if (attr == &dev_attr_fnode_password.attr) {
 978                 param = ISCSI_FLASHNODE_PASSWORD;
 979         } else if (attr == &dev_attr_fnode_password_in.attr) {
 980                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 981         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 982                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 983         } else {
 984                 WARN_ONCE(1, "Invalid flashnode session attr");
 985                 return 0;
 986         }
 987
 988         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 989 }
 990
 991 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 992         .attrs = iscsi_flashnode_sess_attrs,
 993         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 994 };
 995
 996 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 997         &iscsi_flashnode_sess_attr_group,
 998         NULL,
 999 };
1000
1001 static void iscsi_flashnode_sess_release(struct device *dev)
1002 {
1003         struct iscsi_bus_flash_session *fnode_sess =
1004                                                 iscsi_dev_to_flash_session(dev);
1005
1006         kfree(fnode_sess->targetname);
1007         kfree(fnode_sess->targetalias);
1008         kfree(fnode_sess->portal_type);
1009         kfree(fnode_sess);
1010 }
1011
1012 static struct device_type iscsi_flashnode_sess_dev_type = {
1013         .name = "iscsi_flashnode_sess_dev_type",
1014         .groups = iscsi_flashnode_sess_attr_groups,
1015         .release = iscsi_flashnode_sess_release,
1016 };
1017
1018 /* flash node connection attrs show */
1019 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1020 static ssize_t                                                          \
1021 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1022                      char *buf)                                         \
1023 {                                                                       \
1024         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1025         struct iscsi_bus_flash_session *fnode_sess =                    \
1026                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1027         struct iscsi_transport *t = fnode_conn->transport;              \
1028         return t->get_flashnode_param(fnode_sess, param, buf);          \
1029 }                                                                       \
1030
1031
1032 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1033         iscsi_flashnode_conn_attr_show(type, name, param)               \
1034 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1035                             show_##type##_##name, NULL);
1036
1037 /* Flash node connection attributes */
1038
1039 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1040                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1041 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1042 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1043 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1044 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1045                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1046 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1047                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1049                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1050 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1051                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1052 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1053                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1054 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1055                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1056 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1057 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1058 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1059 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1060                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1061 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1062                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1063 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1064 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1065 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1066 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1067                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1068 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1069                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1070 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1071                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1072 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1073                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1074 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1075 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1076 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1077 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1078
1079 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1080         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1081         &dev_attr_fnode_header_digest.attr,
1082         &dev_attr_fnode_data_digest.attr,
1083         &dev_attr_fnode_snack_req.attr,
1084         &dev_attr_fnode_tcp_timestamp_stat.attr,
1085         &dev_attr_fnode_tcp_nagle_disable.attr,
1086         &dev_attr_fnode_tcp_wsf_disable.attr,
1087         &dev_attr_fnode_tcp_timer_scale.attr,
1088         &dev_attr_fnode_tcp_timestamp_enable.attr,
1089         &dev_attr_fnode_fragment_disable.attr,
1090         &dev_attr_fnode_max_recv_dlength.attr,
1091         &dev_attr_fnode_max_xmit_dlength.attr,
1092         &dev_attr_fnode_keepalive_tmo.attr,
1093         &dev_attr_fnode_port.attr,
1094         &dev_attr_fnode_ipaddress.attr,
1095         &dev_attr_fnode_redirect_ipaddr.attr,
1096         &dev_attr_fnode_max_segment_size.attr,
1097         &dev_attr_fnode_local_port.attr,
1098         &dev_attr_fnode_ipv4_tos.attr,
1099         &dev_attr_fnode_ipv6_traffic_class.attr,
1100         &dev_attr_fnode_ipv6_flow_label.attr,
1101         &dev_attr_fnode_link_local_ipv6.attr,
1102         &dev_attr_fnode_tcp_xmit_wsf.attr,
1103         &dev_attr_fnode_tcp_recv_wsf.attr,
1104         &dev_attr_fnode_statsn.attr,
1105         &dev_attr_fnode_exp_statsn.attr,
1106         NULL,
1107 };
1108
1109 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1110                                                     struct attribute *attr,
1111                                                     int i)
1112 {
1113         struct device *dev = container_of(kobj, struct device, kobj);
1114         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1115         struct iscsi_transport *t = fnode_conn->transport;
1116         int param;
1117
1118         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1119                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1120         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1121                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1122         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1123                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1124         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1125                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1126         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1127                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1128         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1129                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1130         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1131                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1132         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1133                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1134         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1135                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1136         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1137                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1138         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1139                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1140         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1141                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1142         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1143                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1144         } else if (attr == &dev_attr_fnode_port.attr) {
1145                 param = ISCSI_FLASHNODE_PORT;
1146         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1147                 param = ISCSI_FLASHNODE_IPADDR;
1148         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1149                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1150         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1151                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1152         } else if (attr == &dev_attr_fnode_local_port.attr) {
1153                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1154         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1155                 param = ISCSI_FLASHNODE_IPV4_TOS;
1156         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1157                 param = ISCSI_FLASHNODE_IPV6_TC;
1158         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1159                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1160         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1161                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1162         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1163                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1164         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1165                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1166         } else if (attr == &dev_attr_fnode_statsn.attr) {
1167                 param = ISCSI_FLASHNODE_STATSN;
1168         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1169                 param = ISCSI_FLASHNODE_EXP_STATSN;
1170         } else {
1171                 WARN_ONCE(1, "Invalid flashnode connection attr");
1172                 return 0;
1173         }
1174
1175         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1176 }
1177
1178 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1179         .attrs = iscsi_flashnode_conn_attrs,
1180         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1181 };
1182
1183 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1184         &iscsi_flashnode_conn_attr_group,
1185         NULL,
1186 };
1187
1188 static void iscsi_flashnode_conn_release(struct device *dev)
1189 {
1190         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1191
1192         kfree(fnode_conn->ipaddress);
1193         kfree(fnode_conn->redirect_ipaddr);
1194         kfree(fnode_conn->link_local_ipv6_addr);
1195         kfree(fnode_conn);
1196 }
1197
1198 static struct device_type iscsi_flashnode_conn_dev_type = {
1199         .name = "iscsi_flashnode_conn_dev_type",
1200         .groups = iscsi_flashnode_conn_attr_groups,
1201         .release = iscsi_flashnode_conn_release,
1202 };
1203
1204 static struct bus_type iscsi_flashnode_bus;
1205
1206 int iscsi_flashnode_bus_match(struct device *dev,
1207                                      struct device_driver *drv)
1208 {
1209         if (dev->bus == &iscsi_flashnode_bus)
1210                 return 1;
1211         return 0;
1212 }
1213 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1214
1215 static struct bus_type iscsi_flashnode_bus = {
1216         .name = "iscsi_flashnode",
1217         .match = &iscsi_flashnode_bus_match,
1218 };
1219
1220 /**
1221  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1222  * @shost: pointer to host data
1223  * @index: index of flashnode to add in sysfs
1224  * @transport: pointer to transport data
1225  * @dd_size: total size to allocate
1226  *
1227  * Adds a sysfs entry for the flashnode session attributes
1228  *
1229  * Returns:
1230  *  pointer to allocated flashnode sess on success
1231  *  %NULL on failure
1232  */
1233 struct iscsi_bus_flash_session *
1234 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1235                             struct iscsi_transport *transport,
1236                             int dd_size)
1237 {
1238         struct iscsi_bus_flash_session *fnode_sess;
1239         int err;
1240
1241         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1242         if (!fnode_sess)
1243                 return NULL;
1244
1245         fnode_sess->transport = transport;
1246         fnode_sess->target_id = index;
1247         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1248         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1249         fnode_sess->dev.parent = &shost->shost_gendev;
1250         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1251                      shost->host_no, index);
1252
1253         err = device_register(&fnode_sess->dev);
1254         if (err)
1255                 goto free_fnode_sess;
1256
1257         if (dd_size)
1258                 fnode_sess->dd_data = &fnode_sess[1];
1259
1260         return fnode_sess;
1261
1262 free_fnode_sess:
1263         kfree(fnode_sess);
1264         return NULL;
1265 }
1266 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1267
1268 /**
1269  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1270  * @shost: pointer to host data
1271  * @fnode_sess: pointer to the parent flashnode session entry
1272  * @transport: pointer to transport data
1273  * @dd_size: total size to allocate
1274  *
1275  * Adds a sysfs entry for the flashnode connection attributes
1276  *
1277  * Returns:
1278  *  pointer to allocated flashnode conn on success
1279  *  %NULL on failure
1280  */
1281 struct iscsi_bus_flash_conn *
1282 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1283                             struct iscsi_bus_flash_session *fnode_sess,
1284                             struct iscsi_transport *transport,
1285                             int dd_size)
1286 {
1287         struct iscsi_bus_flash_conn *fnode_conn;
1288         int err;
1289
1290         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1291         if (!fnode_conn)
1292                 return NULL;
1293
1294         fnode_conn->transport = transport;
1295         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1296         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1297         fnode_conn->dev.parent = &fnode_sess->dev;
1298         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1299                      shost->host_no, fnode_sess->target_id);
1300
1301         err = device_register(&fnode_conn->dev);
1302         if (err)
1303                 goto free_fnode_conn;
1304
1305         if (dd_size)
1306                 fnode_conn->dd_data = &fnode_conn[1];
1307
1308         return fnode_conn;
1309
1310 free_fnode_conn:
1311         kfree(fnode_conn);
1312         return NULL;
1313 }
1314 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1315
1316 /**
1317  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1318  * @dev: device to verify
1319  * @data: pointer to data containing value to use for verification
1320  *
1321  * Verifies if the passed device is flashnode conn device
1322  *
1323  * Returns:
1324  *  1 on success
1325  *  0 on failure
1326  */
1327 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1328 {
1329         return dev->bus == &iscsi_flashnode_bus;
1330 }
1331
1332 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1333 {
1334         device_unregister(&fnode_conn->dev);
1335         return 0;
1336 }
1337
1338 static int flashnode_match_index(struct device *dev, void *data)
1339 {
1340         struct iscsi_bus_flash_session *fnode_sess = NULL;
1341         int ret = 0;
1342
1343         if (!iscsi_flashnode_bus_match(dev, NULL))
1344                 goto exit_match_index;
1345
1346         fnode_sess = iscsi_dev_to_flash_session(dev);
1347         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1348
1349 exit_match_index:
1350         return ret;
1351 }
1352
1353 /**
1354  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1355  * @shost: pointer to host data
1356  * @idx: index to match
1357  *
1358  * Finds the flashnode session object for the passed index
1359  *
1360  * Returns:
1361  *  pointer to found flashnode session object on success
1362  *  %NULL on failure
1363  */
1364 static struct iscsi_bus_flash_session *
1365 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1366 {
1367         struct iscsi_bus_flash_session *fnode_sess = NULL;
1368         struct device *dev;
1369
1370         dev = device_find_child(&shost->shost_gendev, &idx,
1371                                 flashnode_match_index);
1372         if (dev)
1373                 fnode_sess = iscsi_dev_to_flash_session(dev);
1374
1375         return fnode_sess;
1376 }
1377
1378 /**
1379  * iscsi_find_flashnode_sess - finds flashnode session entry
1380  * @shost: pointer to host data
1381  * @data: pointer to data containing value to use for comparison
1382  * @fn: function pointer that does actual comparison
1383  *
1384  * Finds the flashnode session object comparing the data passed using logic
1385  * defined in passed function pointer
1386  *
1387  * Returns:
1388  *  pointer to found flashnode session device object on success
1389  *  %NULL on failure
1390  */
1391 struct device *
1392 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1393                           int (*fn)(struct device *dev, void *data))
1394 {
1395         return device_find_child(&shost->shost_gendev, data, fn);
1396 }
1397 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1398
1399 /**
1400  * iscsi_find_flashnode_conn - finds flashnode connection entry
1401  * @fnode_sess: pointer to parent flashnode session entry
1402  *
1403  * Finds the flashnode connection object comparing the data passed using logic
1404  * defined in passed function pointer
1405  *
1406  * Returns:
1407  *  pointer to found flashnode connection device object on success
1408  *  %NULL on failure
1409  */
1410 struct device *
1411 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1412 {
1413         return device_find_child(&fnode_sess->dev, NULL,
1414                                  iscsi_is_flashnode_conn_dev);
1415 }
1416 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1417
1418 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1419 {
1420         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1421                 return 0;
1422
1423         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1424 }
1425
1426 /**
1427  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1428  * @fnode_sess: pointer to flashnode session entry to be destroyed
1429  *
1430  * Deletes the flashnode session entry and all children flashnode connection
1431  * entries from sysfs
1432  */
1433 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1434 {
1435         int err;
1436
1437         err = device_for_each_child(&fnode_sess->dev, NULL,
1438                                     iscsi_iter_destroy_flashnode_conn_fn);
1439         if (err)
1440                 pr_err("Could not delete all connections for %s. Error %d.\n",
1441                        fnode_sess->dev.kobj.name, err);
1442
1443         device_unregister(&fnode_sess->dev);
1444 }
1445 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1446
1447 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1448 {
1449         if (!iscsi_flashnode_bus_match(dev, NULL))
1450                 return 0;
1451
1452         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1453         return 0;
1454 }
1455
1456 /**
1457  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1458  * @shost: pointer to host data
1459  *
1460  * Destroys all the flashnode session entries and all corresponding children
1461  * flashnode connection entries from sysfs
1462  */
1463 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1464 {
1465         device_for_each_child(&shost->shost_gendev, NULL,
1466                               iscsi_iter_destroy_flashnode_fn);
1467 }
1468 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1469
1470 /*
1471  * BSG support
1472  */
1473 /**
1474  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1475  * @job: bsg job to be processed
1476  */
1477 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1478 {
1479         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1480         struct iscsi_bsg_request *req = job->request;
1481         struct iscsi_bsg_reply *reply = job->reply;
1482         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1483         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1484         int ret;
1485
1486         /* check if we have the msgcode value at least */
1487         if (job->request_len < sizeof(uint32_t)) {
1488                 ret = -ENOMSG;
1489                 goto fail_host_msg;
1490         }
1491
1492         /* Validate the host command */
1493         switch (req->msgcode) {
1494         case ISCSI_BSG_HST_VENDOR:
1495                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1496                 if ((shost->hostt->vendor_id == 0L) ||
1497                     (req->rqst_data.h_vendor.vendor_id !=
1498                         shost->hostt->vendor_id)) {
1499                         ret = -ESRCH;
1500                         goto fail_host_msg;
1501                 }
1502                 break;
1503         default:
1504                 ret = -EBADR;
1505                 goto fail_host_msg;
1506         }
1507
1508         /* check if we really have all the request data needed */
1509         if (job->request_len < cmdlen) {
1510                 ret = -ENOMSG;
1511                 goto fail_host_msg;
1512         }
1513
1514         ret = i->iscsi_transport->bsg_request(job);
1515         if (!ret)
1516                 return 0;
1517
1518 fail_host_msg:
1519         /* return the errno failure code as the only status */
1520         BUG_ON(job->reply_len < sizeof(uint32_t));
1521         reply->reply_payload_rcv_len = 0;
1522         reply->result = ret;
1523         job->reply_len = sizeof(uint32_t);
1524         bsg_job_done(job, ret, 0);
1525         return 0;
1526 }
1527
1528 /**
1529  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1530  * @shost: shost for iscsi_host
1531  * @ihost: iscsi_cls_host adding the structures to
1532  */
1533 static int
1534 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1535 {
1536         struct device *dev = &shost->shost_gendev;
1537         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1538         struct request_queue *q;
1539         char bsg_name[20];
1540         int ret;
1541
1542         if (!i->iscsi_transport->bsg_request)
1543                 return -ENOTSUPP;
1544
1545         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1546
1547         q = __scsi_alloc_queue(shost, bsg_request_fn);
1548         if (!q)
1549                 return -ENOMEM;
1550
1551         ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
1552         if (ret) {
1553                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1554                              "initialize - no request queue\n");
1555                 blk_cleanup_queue(q);
1556                 return ret;
1557         }
1558
1559         ihost->bsg_q = q;
1560         return 0;
1561 }
1562
1563 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1564                             struct device *cdev)
1565 {
1566         struct Scsi_Host *shost = dev_to_shost(dev);
1567         struct iscsi_cls_host *ihost = shost->shost_data;
1568
1569         memset(ihost, 0, sizeof(*ihost));
1570         atomic_set(&ihost->nr_scans, 0);
1571         mutex_init(&ihost->mutex);
1572
1573         iscsi_bsg_host_add(shost, ihost);
1574         /* ignore any bsg add error - we just can't do sgio */
1575
1576         return 0;
1577 }
1578
1579 static int iscsi_remove_host(struct transport_container *tc,
1580                              struct device *dev, struct device *cdev)
1581 {
1582         struct Scsi_Host *shost = dev_to_shost(dev);
1583         struct iscsi_cls_host *ihost = shost->shost_data;
1584
1585         if (ihost->bsg_q) {
1586                 bsg_unregister_queue(ihost->bsg_q);
1587                 blk_cleanup_queue(ihost->bsg_q);
1588         }
1589         return 0;
1590 }
1591
1592 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1593                                "iscsi_host",
1594                                iscsi_setup_host,
1595                                iscsi_remove_host,
1596                                NULL);
1597
1598 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1599                                "iscsi_session",
1600                                NULL,
1601                                NULL,
1602                                NULL);
1603
1604 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1605                                "iscsi_connection",
1606                                NULL,
1607                                NULL,
1608                                NULL);
1609
1610 static struct sock *nls;
1611 static DEFINE_MUTEX(rx_queue_mutex);
1612
1613 static LIST_HEAD(sesslist);
1614 static DEFINE_SPINLOCK(sesslock);
1615 static LIST_HEAD(connlist);
1616 static DEFINE_SPINLOCK(connlock);
1617
1618 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1619 {
1620         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1621         return sess->sid;
1622 }
1623
1624 /*
1625  * Returns the matching session to a given sid
1626  */
1627 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1628 {
1629         unsigned long flags;
1630         struct iscsi_cls_session *sess;
1631
1632         spin_lock_irqsave(&sesslock, flags);
1633         list_for_each_entry(sess, &sesslist, sess_list) {
1634                 if (sess->sid == sid) {
1635                         spin_unlock_irqrestore(&sesslock, flags);
1636                         return sess;
1637                 }
1638         }
1639         spin_unlock_irqrestore(&sesslock, flags);
1640         return NULL;
1641 }
1642
1643 /*
1644  * Returns the matching connection to a given sid / cid tuple
1645  */
1646 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1647 {
1648         unsigned long flags;
1649         struct iscsi_cls_conn *conn;
1650
1651         spin_lock_irqsave(&connlock, flags);
1652         list_for_each_entry(conn, &connlist, conn_list) {
1653                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1654                         spin_unlock_irqrestore(&connlock, flags);
1655                         return conn;
1656                 }
1657         }
1658         spin_unlock_irqrestore(&connlock, flags);
1659         return NULL;
1660 }
1661
1662 /*
1663  * The following functions can be used by LLDs that allocate
1664  * their own scsi_hosts or by software iscsi LLDs
1665  */
1666 static struct {
1667         int value;
1668         char *name;
1669 } iscsi_session_state_names[] = {
1670         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1671         { ISCSI_SESSION_FAILED,         "FAILED" },
1672         { ISCSI_SESSION_FREE,           "FREE" },
1673 };
1674
1675 static const char *iscsi_session_state_name(int state)
1676 {
1677         int i;
1678         char *name = NULL;
1679
1680         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1681                 if (iscsi_session_state_names[i].value == state) {
1682                         name = iscsi_session_state_names[i].name;
1683                         break;
1684                 }
1685         }
1686         return name;
1687 }
1688
1689 int iscsi_session_chkready(struct iscsi_cls_session *session)
1690 {
1691         unsigned long flags;
1692         int err;
1693
1694         spin_lock_irqsave(&session->lock, flags);
1695         switch (session->state) {
1696         case ISCSI_SESSION_LOGGED_IN:
1697                 err = 0;
1698                 break;
1699         case ISCSI_SESSION_FAILED:
1700                 err = DID_IMM_RETRY << 16;
1701                 break;
1702         case ISCSI_SESSION_FREE:
1703                 err = DID_TRANSPORT_FAILFAST << 16;
1704                 break;
1705         default:
1706                 err = DID_NO_CONNECT << 16;
1707                 break;
1708         }
1709         spin_unlock_irqrestore(&session->lock, flags);
1710         return err;
1711 }
1712 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1713
1714 int iscsi_is_session_online(struct iscsi_cls_session *session)
1715 {
1716         unsigned long flags;
1717         int ret = 0;
1718
1719         spin_lock_irqsave(&session->lock, flags);
1720         if (session->state == ISCSI_SESSION_LOGGED_IN)
1721                 ret = 1;
1722         spin_unlock_irqrestore(&session->lock, flags);
1723         return ret;
1724 }
1725 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1726
1727 static void iscsi_session_release(struct device *dev)
1728 {
1729         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1730         struct Scsi_Host *shost;
1731
1732         shost = iscsi_session_to_shost(session);
1733         scsi_host_put(shost);
1734         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1735         kfree(session);
1736 }
1737
1738 int iscsi_is_session_dev(const struct device *dev)
1739 {
1740         return dev->release == iscsi_session_release;
1741 }
1742 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1743
1744 static int iscsi_iter_session_fn(struct device *dev, void *data)
1745 {
1746         void (* fn) (struct iscsi_cls_session *) = data;
1747
1748         if (!iscsi_is_session_dev(dev))
1749                 return 0;
1750         fn(iscsi_dev_to_session(dev));
1751         return 0;
1752 }
1753
1754 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1755                                  void (*fn)(struct iscsi_cls_session *))
1756 {
1757         device_for_each_child(&shost->shost_gendev, fn,
1758                               iscsi_iter_session_fn);
1759 }
1760 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1761
1762 /**
1763  * iscsi_scan_finished - helper to report when running scans are done
1764  * @shost: scsi host
1765  * @time: scan run time
1766  *
1767  * This function can be used by drives like qla4xxx to report to the scsi
1768  * layer when the scans it kicked off at module load time are done.
1769  */
1770 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1771 {
1772         struct iscsi_cls_host *ihost = shost->shost_data;
1773         /*
1774          * qla4xxx will have kicked off some session unblocks before calling
1775          * scsi_scan_host, so just wait for them to complete.
1776          */
1777         return !atomic_read(&ihost->nr_scans);
1778 }
1779 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1780
1781 struct iscsi_scan_data {
1782         unsigned int channel;
1783         unsigned int id;
1784         u64 lun;
1785         enum scsi_scan_mode rescan;
1786 };
1787
1788 static int iscsi_user_scan_session(struct device *dev, void *data)
1789 {
1790         struct iscsi_scan_data *scan_data = data;
1791         struct iscsi_cls_session *session;
1792         struct Scsi_Host *shost;
1793         struct iscsi_cls_host *ihost;
1794         unsigned long flags;
1795         unsigned int id;
1796
1797         if (!iscsi_is_session_dev(dev))
1798                 return 0;
1799
1800         session = iscsi_dev_to_session(dev);
1801
1802         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1803
1804         shost = iscsi_session_to_shost(session);
1805         ihost = shost->shost_data;
1806
1807         mutex_lock(&ihost->mutex);
1808         spin_lock_irqsave(&session->lock, flags);
1809         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1810                 spin_unlock_irqrestore(&session->lock, flags);
1811                 goto user_scan_exit;
1812         }
1813         id = session->target_id;
1814         spin_unlock_irqrestore(&session->lock, flags);
1815
1816         if (id != ISCSI_MAX_TARGET) {
1817                 if ((scan_data->channel == SCAN_WILD_CARD ||
1818                      scan_data->channel == 0) &&
1819                     (scan_data->id == SCAN_WILD_CARD ||
1820                      scan_data->id == id))
1821                         scsi_scan_target(&session->dev, 0, id,
1822                                          scan_data->lun, scan_data->rescan);
1823         }
1824
1825 user_scan_exit:
1826         mutex_unlock(&ihost->mutex);
1827         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1828         return 0;
1829 }
1830
1831 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1832                            uint id, u64 lun)
1833 {
1834         struct iscsi_scan_data scan_data;
1835
1836         scan_data.channel = channel;
1837         scan_data.id = id;
1838         scan_data.lun = lun;
1839         scan_data.rescan = SCSI_SCAN_MANUAL;
1840
1841         return device_for_each_child(&shost->shost_gendev, &scan_data,
1842                                      iscsi_user_scan_session);
1843 }
1844
1845 static void iscsi_scan_session(struct work_struct *work)
1846 {
1847         struct iscsi_cls_session *session =
1848                         container_of(work, struct iscsi_cls_session, scan_work);
1849         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1850         struct iscsi_cls_host *ihost = shost->shost_data;
1851         struct iscsi_scan_data scan_data;
1852
1853         scan_data.channel = 0;
1854         scan_data.id = SCAN_WILD_CARD;
1855         scan_data.lun = SCAN_WILD_CARD;
1856         scan_data.rescan = SCSI_SCAN_RESCAN;
1857
1858         iscsi_user_scan_session(&session->dev, &scan_data);
1859         atomic_dec(&ihost->nr_scans);
1860 }
1861
1862 /**
1863  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1864  * @cmd: scsi cmd passed to scsi eh handler
1865  *
1866  * If the session is down this function will wait for the recovery
1867  * timer to fire or for the session to be logged back in. If the
1868  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1869  * should pass this error value to the scsi eh.
1870  */
1871 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1872 {
1873         struct iscsi_cls_session *session =
1874                         starget_to_session(scsi_target(cmd->device));
1875         unsigned long flags;
1876         int ret = 0;
1877
1878         spin_lock_irqsave(&session->lock, flags);
1879         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1880                 if (session->state == ISCSI_SESSION_FREE) {
1881                         ret = FAST_IO_FAIL;
1882                         break;
1883                 }
1884                 spin_unlock_irqrestore(&session->lock, flags);
1885                 msleep(1000);
1886                 spin_lock_irqsave(&session->lock, flags);
1887         }
1888         spin_unlock_irqrestore(&session->lock, flags);
1889         return ret;
1890 }
1891 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1892
1893 static void session_recovery_timedout(struct work_struct *work)
1894 {
1895         struct iscsi_cls_session *session =
1896                 container_of(work, struct iscsi_cls_session,
1897                              recovery_work.work);
1898         unsigned long flags;
1899
1900         iscsi_cls_session_printk(KERN_INFO, session,
1901                                  "session recovery timed out after %d secs\n",
1902                                  session->recovery_tmo);
1903
1904         spin_lock_irqsave(&session->lock, flags);
1905         switch (session->state) {
1906         case ISCSI_SESSION_FAILED:
1907                 session->state = ISCSI_SESSION_FREE;
1908                 break;
1909         case ISCSI_SESSION_LOGGED_IN:
1910         case ISCSI_SESSION_FREE:
1911                 /* we raced with the unblock's flush */
1912                 spin_unlock_irqrestore(&session->lock, flags);
1913                 return;
1914         }
1915         spin_unlock_irqrestore(&session->lock, flags);
1916
1917         if (session->transport->session_recovery_timedout)
1918                 session->transport->session_recovery_timedout(session);
1919
1920         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1921         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1922         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1923 }
1924
1925 static void __iscsi_unblock_session(struct work_struct *work)
1926 {
1927         struct iscsi_cls_session *session =
1928                         container_of(work, struct iscsi_cls_session,
1929                                      unblock_work);
1930         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1931         struct iscsi_cls_host *ihost = shost->shost_data;
1932         unsigned long flags;
1933
1934         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1935         /*
1936          * The recovery and unblock work get run from the same workqueue,
1937          * so try to cancel it if it was going to run after this unblock.
1938          */
1939         cancel_delayed_work(&session->recovery_work);
1940         spin_lock_irqsave(&session->lock, flags);
1941         session->state = ISCSI_SESSION_LOGGED_IN;
1942         spin_unlock_irqrestore(&session->lock, flags);
1943         /* start IO */
1944         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1945         /*
1946          * Only do kernel scanning if the driver is properly hooked into
1947          * the async scanning code (drivers like iscsi_tcp do login and
1948          * scanning from userspace).
1949          */
1950         if (shost->hostt->scan_finished) {
1951                 if (scsi_queue_work(shost, &session->scan_work))
1952                         atomic_inc(&ihost->nr_scans);
1953         }
1954         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1955 }
1956
1957 /**
1958  * iscsi_unblock_session - set a session as logged in and start IO.
1959  * @session: iscsi session
1960  *
1961  * Mark a session as ready to accept IO.
1962  */
1963 void iscsi_unblock_session(struct iscsi_cls_session *session)
1964 {
1965         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1966         /*
1967          * make sure all the events have completed before tell the driver
1968          * it is safe
1969          */
1970         flush_workqueue(iscsi_eh_timer_workq);
1971 }
1972 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1973
1974 static void __iscsi_block_session(struct work_struct *work)
1975 {
1976         struct iscsi_cls_session *session =
1977                         container_of(work, struct iscsi_cls_session,
1978                                      block_work);
1979         unsigned long flags;
1980
1981         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1982         spin_lock_irqsave(&session->lock, flags);
1983         session->state = ISCSI_SESSION_FAILED;
1984         spin_unlock_irqrestore(&session->lock, flags);
1985         scsi_target_block(&session->dev);
1986         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1987         if (session->recovery_tmo >= 0)
1988                 queue_delayed_work(iscsi_eh_timer_workq,
1989                                    &session->recovery_work,
1990                                    session->recovery_tmo * HZ);
1991 }
1992
1993 void iscsi_block_session(struct iscsi_cls_session *session)
1994 {
1995         queue_work(iscsi_eh_timer_workq, &session->block_work);
1996 }
1997 EXPORT_SYMBOL_GPL(iscsi_block_session);
1998
1999 static void __iscsi_unbind_session(struct work_struct *work)
2000 {
2001         struct iscsi_cls_session *session =
2002                         container_of(work, struct iscsi_cls_session,
2003                                      unbind_work);
2004         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2005         struct iscsi_cls_host *ihost = shost->shost_data;
2006         unsigned long flags;
2007         unsigned int target_id;
2008
2009         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2010
2011         /* Prevent new scans and make sure scanning is not in progress */
2012         mutex_lock(&ihost->mutex);
2013         spin_lock_irqsave(&session->lock, flags);
2014         if (session->target_id == ISCSI_MAX_TARGET) {
2015                 spin_unlock_irqrestore(&session->lock, flags);
2016                 mutex_unlock(&ihost->mutex);
2017                 return;
2018         }
2019
2020         target_id = session->target_id;
2021         session->target_id = ISCSI_MAX_TARGET;
2022         spin_unlock_irqrestore(&session->lock, flags);
2023         mutex_unlock(&ihost->mutex);
2024
2025         if (session->ida_used)
2026                 ida_simple_remove(&iscsi_sess_ida, target_id);
2027
2028         scsi_remove_target(&session->dev);
2029         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2030         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2031 }
2032
2033 struct iscsi_cls_session *
2034 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2035                     int dd_size)
2036 {
2037         struct iscsi_cls_session *session;
2038
2039         session = kzalloc(sizeof(*session) + dd_size,
2040                           GFP_KERNEL);
2041         if (!session)
2042                 return NULL;
2043
2044         session->transport = transport;
2045         session->creator = -1;
2046         session->recovery_tmo = 120;
2047         session->recovery_tmo_sysfs_override = false;
2048         session->state = ISCSI_SESSION_FREE;
2049         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2050         INIT_LIST_HEAD(&session->sess_list);
2051         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2052         INIT_WORK(&session->block_work, __iscsi_block_session);
2053         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2054         INIT_WORK(&session->scan_work, iscsi_scan_session);
2055         spin_lock_init(&session->lock);
2056
2057         /* this is released in the dev's release function */
2058         scsi_host_get(shost);
2059         session->dev.parent = &shost->shost_gendev;
2060         session->dev.release = iscsi_session_release;
2061         device_initialize(&session->dev);
2062         if (dd_size)
2063                 session->dd_data = &session[1];
2064
2065         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2066         return session;
2067 }
2068 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2069
2070 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2071 {
2072         unsigned long flags;
2073         int id = 0;
2074         int err;
2075
2076         session->sid = atomic_add_return(1, &iscsi_session_nr);
2077
2078         if (target_id == ISCSI_MAX_TARGET) {
2079                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2080
2081                 if (id < 0) {
2082                         iscsi_cls_session_printk(KERN_ERR, session,
2083                                         "Failure in Target ID Allocation\n");
2084                         return id;
2085                 }
2086                 session->target_id = (unsigned int)id;
2087                 session->ida_used = true;
2088         } else
2089                 session->target_id = target_id;
2090
2091         dev_set_name(&session->dev, "session%u", session->sid);
2092         err = device_add(&session->dev);
2093         if (err) {
2094                 iscsi_cls_session_printk(KERN_ERR, session,
2095                                          "could not register session's dev\n");
2096                 goto release_ida;
2097         }
2098         transport_register_device(&session->dev);
2099
2100         spin_lock_irqsave(&sesslock, flags);
2101         list_add(&session->sess_list, &sesslist);
2102         spin_unlock_irqrestore(&sesslock, flags);
2103
2104         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2105         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2106         return 0;
2107
2108 release_ida:
2109         if (session->ida_used)
2110                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2111
2112         return err;
2113 }
2114 EXPORT_SYMBOL_GPL(iscsi_add_session);
2115
2116 /**
2117  * iscsi_create_session - create iscsi class session
2118  * @shost: scsi host
2119  * @transport: iscsi transport
2120  * @dd_size: private driver data size
2121  * @target_id: which target
2122  *
2123  * This can be called from a LLD or iscsi_transport.
2124  */
2125 struct iscsi_cls_session *
2126 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2127                      int dd_size, unsigned int target_id)
2128 {
2129         struct iscsi_cls_session *session;
2130
2131         session = iscsi_alloc_session(shost, transport, dd_size);
2132         if (!session)
2133                 return NULL;
2134
2135         if (iscsi_add_session(session, target_id)) {
2136                 iscsi_free_session(session);
2137                 return NULL;
2138         }
2139         return session;
2140 }
2141 EXPORT_SYMBOL_GPL(iscsi_create_session);
2142
2143 static void iscsi_conn_release(struct device *dev)
2144 {
2145         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2146         struct device *parent = conn->dev.parent;
2147
2148         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2149         kfree(conn);
2150         put_device(parent);
2151 }
2152
2153 static int iscsi_is_conn_dev(const struct device *dev)
2154 {
2155         return dev->release == iscsi_conn_release;
2156 }
2157
2158 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2159 {
2160         if (!iscsi_is_conn_dev(dev))
2161                 return 0;
2162         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2163 }
2164
2165 void iscsi_remove_session(struct iscsi_cls_session *session)
2166 {
2167         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2168         unsigned long flags;
2169         int err;
2170
2171         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2172
2173         spin_lock_irqsave(&sesslock, flags);
2174         list_del(&session->sess_list);
2175         spin_unlock_irqrestore(&sesslock, flags);
2176
2177         /* make sure there are no blocks/unblocks queued */
2178         flush_workqueue(iscsi_eh_timer_workq);
2179         /* make sure the timedout callout is not running */
2180         if (!cancel_delayed_work(&session->recovery_work))
2181                 flush_workqueue(iscsi_eh_timer_workq);
2182         /*
2183          * If we are blocked let commands flow again. The lld or iscsi
2184          * layer should set up the queuecommand to fail commands.
2185          * We assume that LLD will not be calling block/unblock while
2186          * removing the session.
2187          */
2188         spin_lock_irqsave(&session->lock, flags);
2189         session->state = ISCSI_SESSION_FREE;
2190         spin_unlock_irqrestore(&session->lock, flags);
2191
2192         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2193         /* flush running scans then delete devices */
2194         scsi_flush_work(shost);
2195         __iscsi_unbind_session(&session->unbind_work);
2196
2197         /* hw iscsi may not have removed all connections from session */
2198         err = device_for_each_child(&session->dev, NULL,
2199                                     iscsi_iter_destroy_conn_fn);
2200         if (err)
2201                 iscsi_cls_session_printk(KERN_ERR, session,
2202                                          "Could not delete all connections "
2203                                          "for session. Error %d.\n", err);
2204
2205         transport_unregister_device(&session->dev);
2206
2207         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2208         device_del(&session->dev);
2209 }
2210 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2211
2212 void iscsi_free_session(struct iscsi_cls_session *session)
2213 {
2214         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2215         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2216         put_device(&session->dev);
2217 }
2218 EXPORT_SYMBOL_GPL(iscsi_free_session);
2219
2220 /**
2221  * iscsi_destroy_session - destroy iscsi session
2222  * @session: iscsi_session
2223  *
2224  * Can be called by a LLD or iscsi_transport. There must not be
2225  * any running connections.
2226  */
2227 int iscsi_destroy_session(struct iscsi_cls_session *session)
2228 {
2229         iscsi_remove_session(session);
2230         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
2231         iscsi_free_session(session);
2232         return 0;
2233 }
2234 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
2235
2236 /**
2237  * iscsi_create_conn - create iscsi class connection
2238  * @session: iscsi cls session
2239  * @dd_size: private driver data size
2240  * @cid: connection id
2241  *
2242  * This can be called from a LLD or iscsi_transport. The connection
2243  * is child of the session so cid must be unique for all connections
2244  * on the session.
2245  *
2246  * Since we do not support MCS, cid will normally be zero. In some cases
2247  * for software iscsi we could be trying to preallocate a connection struct
2248  * in which case there could be two connection structs and cid would be
2249  * non-zero.
2250  */
2251 struct iscsi_cls_conn *
2252 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2253 {
2254         struct iscsi_transport *transport = session->transport;
2255         struct iscsi_cls_conn *conn;
2256         unsigned long flags;
2257         int err;
2258
2259         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2260         if (!conn)
2261                 return NULL;
2262         if (dd_size)
2263                 conn->dd_data = &conn[1];
2264
2265         mutex_init(&conn->ep_mutex);
2266         INIT_LIST_HEAD(&conn->conn_list);
2267         conn->transport = transport;
2268         conn->cid = cid;
2269
2270         /* this is released in the dev's release function */
2271         if (!get_device(&session->dev))
2272                 goto free_conn;
2273
2274         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2275         conn->dev.parent = &session->dev;
2276         conn->dev.release = iscsi_conn_release;
2277         err = device_register(&conn->dev);
2278         if (err) {
2279                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2280                                          "register connection's dev\n");
2281                 goto release_parent_ref;
2282         }
2283         transport_register_device(&conn->dev);
2284
2285         spin_lock_irqsave(&connlock, flags);
2286         list_add(&conn->conn_list, &connlist);
2287         spin_unlock_irqrestore(&connlock, flags);
2288
2289         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2290         return conn;
2291
2292 release_parent_ref:
2293         put_device(&session->dev);
2294 free_conn:
2295         kfree(conn);
2296         return NULL;
2297 }
2298
2299 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2300
2301 /**
2302  * iscsi_destroy_conn - destroy iscsi class connection
2303  * @conn: iscsi cls session
2304  *
2305  * This can be called from a LLD or iscsi_transport.
2306  */
2307 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2308 {
2309         unsigned long flags;
2310
2311         spin_lock_irqsave(&connlock, flags);
2312         list_del(&conn->conn_list);
2313         spin_unlock_irqrestore(&connlock, flags);
2314
2315         transport_unregister_device(&conn->dev);
2316         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2317         device_unregister(&conn->dev);
2318         return 0;
2319 }
2320 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2321
2322 /*
2323  * iscsi interface functions
2324  */
2325 static struct iscsi_internal *
2326 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2327 {
2328         struct iscsi_internal *priv;
2329         unsigned long flags;
2330
2331         spin_lock_irqsave(&iscsi_transport_lock, flags);
2332         list_for_each_entry(priv, &iscsi_transports, list) {
2333                 if (tt == priv->iscsi_transport) {
2334                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2335                         return priv;
2336                 }
2337         }
2338         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2339         return NULL;
2340 }
2341
2342 static int
2343 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2344 {
2345         return nlmsg_multicast(nls, skb, 0, group, gfp);
2346 }
2347
2348 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2349                    char *data, uint32_t data_size)
2350 {
2351         struct nlmsghdr *nlh;
2352         struct sk_buff *skb;
2353         struct iscsi_uevent *ev;
2354         char *pdu;
2355         struct iscsi_internal *priv;
2356         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2357                                    data_size);
2358
2359         priv = iscsi_if_transport_lookup(conn->transport);
2360         if (!priv)
2361                 return -EINVAL;
2362
2363         skb = alloc_skb(len, GFP_ATOMIC);
2364         if (!skb) {
2365                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2366                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2367                                       "control PDU: OOM\n");
2368                 return -ENOMEM;
2369         }
2370
2371         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2372         ev = nlmsg_data(nlh);
2373         memset(ev, 0, sizeof(*ev));
2374         ev->transport_handle = iscsi_handle(conn->transport);
2375         ev->type = ISCSI_KEVENT_RECV_PDU;
2376         ev->r.recv_req.cid = conn->cid;
2377         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2378         pdu = (char*)ev + sizeof(*ev);
2379         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2380         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2381
2382         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2383 }
2384 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2385
2386 int iscsi_offload_mesg(struct Scsi_Host *shost,
2387                        struct iscsi_transport *transport, uint32_t type,
2388                        char *data, uint16_t data_size)
2389 {
2390         struct nlmsghdr *nlh;
2391         struct sk_buff *skb;
2392         struct iscsi_uevent *ev;
2393         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2394
2395         skb = alloc_skb(len, GFP_ATOMIC);
2396         if (!skb) {
2397                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2398                 return -ENOMEM;
2399         }
2400
2401         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2402         ev = nlmsg_data(nlh);
2403         memset(ev, 0, sizeof(*ev));
2404         ev->type = type;
2405         ev->transport_handle = iscsi_handle(transport);
2406         switch (type) {
2407         case ISCSI_KEVENT_PATH_REQ:
2408                 ev->r.req_path.host_no = shost->host_no;
2409                 break;
2410         case ISCSI_KEVENT_IF_DOWN:
2411                 ev->r.notify_if_down.host_no = shost->host_no;
2412                 break;
2413         }
2414
2415         memcpy((char *)ev + sizeof(*ev), data, data_size);
2416
2417         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2418 }
2419 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2420
2421 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2422 {
2423         struct nlmsghdr *nlh;
2424         struct sk_buff  *skb;
2425         struct iscsi_uevent *ev;
2426         struct iscsi_internal *priv;
2427         int len = nlmsg_total_size(sizeof(*ev));
2428
2429         priv = iscsi_if_transport_lookup(conn->transport);
2430         if (!priv)
2431                 return;
2432
2433         skb = alloc_skb(len, GFP_ATOMIC);
2434         if (!skb) {
2435                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2436                                       "conn error (%d)\n", error);
2437                 return;
2438         }
2439
2440         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2441         ev = nlmsg_data(nlh);
2442         ev->transport_handle = iscsi_handle(conn->transport);
2443         ev->type = ISCSI_KEVENT_CONN_ERROR;
2444         ev->r.connerror.error = error;
2445         ev->r.connerror.cid = conn->cid;
2446         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2447
2448         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2449
2450         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2451                               error);
2452 }
2453 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2454
2455 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2456                             enum iscsi_conn_state state)
2457 {
2458         struct nlmsghdr *nlh;
2459         struct sk_buff  *skb;
2460         struct iscsi_uevent *ev;
2461         struct iscsi_internal *priv;
2462         int len = nlmsg_total_size(sizeof(*ev));
2463
2464         priv = iscsi_if_transport_lookup(conn->transport);
2465         if (!priv)
2466                 return;
2467
2468         skb = alloc_skb(len, GFP_ATOMIC);
2469         if (!skb) {
2470                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2471                                       "conn login (%d)\n", state);
2472                 return;
2473         }
2474
2475         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2476         ev = nlmsg_data(nlh);
2477         ev->transport_handle = iscsi_handle(conn->transport);
2478         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2479         ev->r.conn_login.state = state;
2480         ev->r.conn_login.cid = conn->cid;
2481         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2482         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2483
2484         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2485                               state);
2486 }
2487 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2488
2489 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2490                            enum iscsi_host_event_code code, uint32_t data_size,
2491                            uint8_t *data)
2492 {
2493         struct nlmsghdr *nlh;
2494         struct sk_buff *skb;
2495         struct iscsi_uevent *ev;
2496         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2497
2498         skb = alloc_skb(len, GFP_NOIO);
2499         if (!skb) {
2500                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2501                        host_no, code);
2502                 return;
2503         }
2504
2505         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2506         ev = nlmsg_data(nlh);
2507         ev->transport_handle = iscsi_handle(transport);
2508         ev->type = ISCSI_KEVENT_HOST_EVENT;
2509         ev->r.host_event.host_no = host_no;
2510         ev->r.host_event.code = code;
2511         ev->r.host_event.data_size = data_size;
2512
2513         if (data_size)
2514                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2515
2516         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2517 }
2518 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2519
2520 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2521                            uint32_t status, uint32_t pid, uint32_t data_size,
2522                            uint8_t *data)
2523 {
2524         struct nlmsghdr *nlh;
2525         struct sk_buff *skb;
2526         struct iscsi_uevent *ev;
2527         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2528
2529         skb = alloc_skb(len, GFP_NOIO);
2530         if (!skb) {
2531                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2532                 return;
2533         }
2534
2535         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2536         ev = nlmsg_data(nlh);
2537         ev->transport_handle = iscsi_handle(transport);
2538         ev->type = ISCSI_KEVENT_PING_COMP;
2539         ev->r.ping_comp.host_no = host_no;
2540         ev->r.ping_comp.status = status;
2541         ev->r.ping_comp.pid = pid;
2542         ev->r.ping_comp.data_size = data_size;
2543         memcpy((char *)ev + sizeof(*ev), data, data_size);
2544
2545         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2546 }
2547 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2548
2549 static int
2550 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
2551                     void *payload, int size)
2552 {
2553         struct sk_buff  *skb;
2554         struct nlmsghdr *nlh;
2555         int len = nlmsg_total_size(size);
2556         int flags = multi ? NLM_F_MULTI : 0;
2557         int t = done ? NLMSG_DONE : type;
2558
2559         skb = alloc_skb(len, GFP_ATOMIC);
2560         if (!skb) {
2561                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2562                 return -ENOMEM;
2563         }
2564
2565         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
2566         nlh->nlmsg_flags = flags;
2567         memcpy(nlmsg_data(nlh), payload, size);
2568         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
2569 }
2570
2571 static int
2572 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2573 {
2574         struct iscsi_uevent *ev = nlmsg_data(nlh);
2575         struct iscsi_stats *stats;
2576         struct sk_buff *skbstat;
2577         struct iscsi_cls_conn *conn;
2578         struct nlmsghdr *nlhstat;
2579         struct iscsi_uevent *evstat;
2580         struct iscsi_internal *priv;
2581         int len = nlmsg_total_size(sizeof(*ev) +
2582                                    sizeof(struct iscsi_stats) +
2583                                    sizeof(struct iscsi_stats_custom) *
2584                                    ISCSI_STATS_CUSTOM_MAX);
2585         int err = 0;
2586
2587         priv = iscsi_if_transport_lookup(transport);
2588         if (!priv)
2589                 return -EINVAL;
2590
2591         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2592         if (!conn)
2593                 return -EEXIST;
2594
2595         do {
2596                 int actual_size;
2597
2598                 skbstat = alloc_skb(len, GFP_ATOMIC);
2599                 if (!skbstat) {
2600                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2601                                               "deliver stats: OOM\n");
2602                         return -ENOMEM;
2603                 }
2604
2605                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2606                                       (len - sizeof(*nlhstat)), 0);
2607                 evstat = nlmsg_data(nlhstat);
2608                 memset(evstat, 0, sizeof(*evstat));
2609                 evstat->transport_handle = iscsi_handle(conn->transport);
2610                 evstat->type = nlh->nlmsg_type;
2611                 evstat->u.get_stats.cid =
2612                         ev->u.get_stats.cid;
2613                 evstat->u.get_stats.sid =
2614                         ev->u.get_stats.sid;
2615                 stats = (struct iscsi_stats *)
2616                         ((char*)evstat + sizeof(*evstat));
2617                 memset(stats, 0, sizeof(*stats));
2618
2619                 transport->get_stats(conn, stats);
2620                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2621                                                sizeof(struct iscsi_stats) +
2622                                                sizeof(struct iscsi_stats_custom) *
2623                                                stats->custom_length);
2624                 actual_size -= sizeof(*nlhstat);
2625                 actual_size = nlmsg_msg_size(actual_size);
2626                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2627                 nlhstat->nlmsg_len = actual_size;
2628
2629                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2630                                           GFP_ATOMIC);
2631         } while (err < 0 && err != -ECONNREFUSED);
2632
2633         return err;
2634 }
2635
2636 /**
2637  * iscsi_session_event - send session destr. completion event
2638  * @session: iscsi class session
2639  * @event: type of event
2640  */
2641 int iscsi_session_event(struct iscsi_cls_session *session,
2642                         enum iscsi_uevent_e event)
2643 {
2644         struct iscsi_internal *priv;
2645         struct Scsi_Host *shost;
2646         struct iscsi_uevent *ev;
2647         struct sk_buff  *skb;
2648         struct nlmsghdr *nlh;
2649         int rc, len = nlmsg_total_size(sizeof(*ev));
2650
2651         priv = iscsi_if_transport_lookup(session->transport);
2652         if (!priv)
2653                 return -EINVAL;
2654         shost = iscsi_session_to_shost(session);
2655
2656         skb = alloc_skb(len, GFP_KERNEL);
2657         if (!skb) {
2658                 iscsi_cls_session_printk(KERN_ERR, session,
2659                                          "Cannot notify userspace of session "
2660                                          "event %u\n", event);
2661                 return -ENOMEM;
2662         }
2663
2664         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2665         ev = nlmsg_data(nlh);
2666         ev->transport_handle = iscsi_handle(session->transport);
2667
2668         ev->type = event;
2669         switch (event) {
2670         case ISCSI_KEVENT_DESTROY_SESSION:
2671                 ev->r.d_session.host_no = shost->host_no;
2672                 ev->r.d_session.sid = session->sid;
2673                 break;
2674         case ISCSI_KEVENT_CREATE_SESSION:
2675                 ev->r.c_session_ret.host_no = shost->host_no;
2676                 ev->r.c_session_ret.sid = session->sid;
2677                 break;
2678         case ISCSI_KEVENT_UNBIND_SESSION:
2679                 ev->r.unbind_session.host_no = shost->host_no;
2680                 ev->r.unbind_session.sid = session->sid;
2681                 break;
2682         default:
2683                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2684                                          "%u.\n", event);
2685                 kfree_skb(skb);
2686                 return -EINVAL;
2687         }
2688
2689         /*
2690          * this will occur if the daemon is not up, so we just warn
2691          * the user and when the daemon is restarted it will handle it
2692          */
2693         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2694         if (rc == -ESRCH)
2695                 iscsi_cls_session_printk(KERN_ERR, session,
2696                                          "Cannot notify userspace of session "
2697                                          "event %u. Check iscsi daemon\n",
2698                                          event);
2699
2700         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2701                                 event, rc);
2702         return rc;
2703 }
2704 EXPORT_SYMBOL_GPL(iscsi_session_event);
2705
2706 static int
2707 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2708                         struct iscsi_uevent *ev, pid_t pid,
2709                         uint32_t initial_cmdsn, uint16_t cmds_max,
2710                         uint16_t queue_depth)
2711 {
2712         struct iscsi_transport *transport = priv->iscsi_transport;
2713         struct iscsi_cls_session *session;
2714         struct Scsi_Host *shost;
2715
2716         session = transport->create_session(ep, cmds_max, queue_depth,
2717                                             initial_cmdsn);
2718         if (!session)
2719                 return -ENOMEM;
2720
2721         session->creator = pid;
2722         shost = iscsi_session_to_shost(session);
2723         ev->r.c_session_ret.host_no = shost->host_no;
2724         ev->r.c_session_ret.sid = session->sid;
2725         ISCSI_DBG_TRANS_SESSION(session,
2726                                 "Completed creating transport session\n");
2727         return 0;
2728 }
2729
2730 static int
2731 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2732 {
2733         struct iscsi_cls_conn *conn;
2734         struct iscsi_cls_session *session;
2735
2736         session = iscsi_session_lookup(ev->u.c_conn.sid);
2737         if (!session) {
2738                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2739                        ev->u.c_conn.sid);
2740                 return -EINVAL;
2741         }
2742
2743         conn = transport->create_conn(session, ev->u.c_conn.cid);
2744         if (!conn) {
2745                 iscsi_cls_session_printk(KERN_ERR, session,
2746                                          "couldn't create a new connection.");
2747                 return -ENOMEM;
2748         }
2749
2750         ev->r.c_conn_ret.sid = session->sid;
2751         ev->r.c_conn_ret.cid = conn->cid;
2752
2753         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2754         return 0;
2755 }
2756
2757 static int
2758 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2759 {
2760         struct iscsi_cls_conn *conn;
2761
2762         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2763         if (!conn)
2764                 return -EINVAL;
2765
2766         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2767         if (transport->destroy_conn)
2768                 transport->destroy_conn(conn);
2769
2770         return 0;
2771 }
2772
2773 static int
2774 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2775 {
2776         char *data = (char*)ev + sizeof(*ev);
2777         struct iscsi_cls_conn *conn;
2778         struct iscsi_cls_session *session;
2779         int err = 0, value = 0;
2780
2781         session = iscsi_session_lookup(ev->u.set_param.sid);
2782         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2783         if (!conn || !session)
2784                 return -EINVAL;
2785
2786         switch (ev->u.set_param.param) {
2787         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2788                 sscanf(data, "%d", &value);
2789                 if (!session->recovery_tmo_sysfs_override)
2790                         session->recovery_tmo = value;
2791                 break;
2792         default:
2793                 err = transport->set_param(conn, ev->u.set_param.param,
2794                                            data, ev->u.set_param.len);
2795         }
2796
2797         return err;
2798 }
2799
2800 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2801                                struct iscsi_uevent *ev, int msg_type)
2802 {
2803         struct iscsi_endpoint *ep;
2804         struct sockaddr *dst_addr;
2805         struct Scsi_Host *shost = NULL;
2806         int non_blocking, err = 0;
2807
2808         if (!transport->ep_connect)
2809                 return -EINVAL;
2810
2811         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2812                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2813                 if (!shost) {
2814                         printk(KERN_ERR "ep connect failed. Could not find "
2815                                "host no %u\n",
2816                                ev->u.ep_connect_through_host.host_no);
2817                         return -ENODEV;
2818                 }
2819                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2820         } else
2821                 non_blocking = ev->u.ep_connect.non_blocking;
2822
2823         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2824         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2825         if (IS_ERR(ep)) {
2826                 err = PTR_ERR(ep);
2827                 goto release_host;
2828         }
2829
2830         ev->r.ep_connect_ret.handle = ep->id;
2831 release_host:
2832         if (shost)
2833                 scsi_host_put(shost);
2834         return err;
2835 }
2836
2837 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2838                                   u64 ep_handle)
2839 {
2840         struct iscsi_cls_conn *conn;
2841         struct iscsi_endpoint *ep;
2842
2843         if (!transport->ep_disconnect)
2844                 return -EINVAL;
2845
2846         ep = iscsi_lookup_endpoint(ep_handle);
2847         if (!ep)
2848                 return -EINVAL;
2849         conn = ep->conn;
2850         if (conn) {
2851                 mutex_lock(&conn->ep_mutex);
2852                 conn->ep = NULL;
2853                 mutex_unlock(&conn->ep_mutex);
2854         }
2855
2856         transport->ep_disconnect(ep);
2857         return 0;
2858 }
2859
2860 static int
2861 iscsi_if_transport_ep(struct iscsi_transport *transport,
2862                       struct iscsi_uevent *ev, int msg_type)
2863 {
2864         struct iscsi_endpoint *ep;
2865         int rc = 0;
2866
2867         switch (msg_type) {
2868         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2869         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2870                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2871                 break;
2872         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2873                 if (!transport->ep_poll)
2874                         return -EINVAL;
2875
2876                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2877                 if (!ep)
2878                         return -EINVAL;
2879
2880                 ev->r.retcode = transport->ep_poll(ep,
2881                                                    ev->u.ep_poll.timeout_ms);
2882                 break;
2883         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2884                 rc = iscsi_if_ep_disconnect(transport,
2885                                             ev->u.ep_disconnect.ep_handle);
2886                 break;
2887         }
2888         return rc;
2889 }
2890
2891 static int
2892 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2893                 struct iscsi_uevent *ev)
2894 {
2895         struct Scsi_Host *shost;
2896         struct sockaddr *dst_addr;
2897         int err;
2898
2899         if (!transport->tgt_dscvr)
2900                 return -EINVAL;
2901
2902         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2903         if (!shost) {
2904                 printk(KERN_ERR "target discovery could not find host no %u\n",
2905                        ev->u.tgt_dscvr.host_no);
2906                 return -ENODEV;
2907         }
2908
2909
2910         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2911         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2912                                    ev->u.tgt_dscvr.enable, dst_addr);
2913         scsi_host_put(shost);
2914         return err;
2915 }
2916
2917 static int
2918 iscsi_set_host_param(struct iscsi_transport *transport,
2919                      struct iscsi_uevent *ev)
2920 {
2921         char *data = (char*)ev + sizeof(*ev);
2922         struct Scsi_Host *shost;
2923         int err;
2924
2925         if (!transport->set_host_param)
2926                 return -ENOSYS;
2927
2928         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2929         if (!shost) {
2930                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2931                        ev->u.set_host_param.host_no);
2932                 return -ENODEV;
2933         }
2934
2935         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2936                                         data, ev->u.set_host_param.len);
2937         scsi_host_put(shost);
2938         return err;
2939 }
2940
2941 static int
2942 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2943 {
2944         struct Scsi_Host *shost;
2945         struct iscsi_path *params;
2946         int err;
2947
2948         if (!transport->set_path)
2949                 return -ENOSYS;
2950
2951         shost = scsi_host_lookup(ev->u.set_path.host_no);
2952         if (!shost) {
2953                 printk(KERN_ERR "set path could not find host no %u\n",
2954                        ev->u.set_path.host_no);
2955                 return -ENODEV;
2956         }
2957
2958         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2959         err = transport->set_path(shost, params);
2960
2961         scsi_host_put(shost);
2962         return err;
2963 }
2964
2965 static int
2966 iscsi_set_iface_params(struct iscsi_transport *transport,
2967                        struct iscsi_uevent *ev, uint32_t len)
2968 {
2969         char *data = (char *)ev + sizeof(*ev);
2970         struct Scsi_Host *shost;
2971         int err;
2972
2973         if (!transport->set_iface_param)
2974                 return -ENOSYS;
2975
2976         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2977         if (!shost) {
2978                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2979                        ev->u.set_iface_params.host_no);
2980                 return -ENODEV;
2981         }
2982
2983         err = transport->set_iface_param(shost, data, len);
2984         scsi_host_put(shost);
2985         return err;
2986 }
2987
2988 static int
2989 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2990 {
2991         struct Scsi_Host *shost;
2992         struct sockaddr *dst_addr;
2993         int err;
2994
2995         if (!transport->send_ping)
2996                 return -ENOSYS;
2997
2998         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
2999         if (!shost) {
3000                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3001                        ev->u.iscsi_ping.host_no);
3002                 return -ENODEV;
3003         }
3004
3005         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3006         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3007                                    ev->u.iscsi_ping.iface_type,
3008                                    ev->u.iscsi_ping.payload_size,
3009                                    ev->u.iscsi_ping.pid,
3010                                    dst_addr);
3011         scsi_host_put(shost);
3012         return err;
3013 }
3014
3015 static int
3016 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3017 {
3018         struct iscsi_uevent *ev = nlmsg_data(nlh);
3019         struct Scsi_Host *shost = NULL;
3020         struct iscsi_chap_rec *chap_rec;
3021         struct iscsi_internal *priv;
3022         struct sk_buff *skbchap;
3023         struct nlmsghdr *nlhchap;
3024         struct iscsi_uevent *evchap;
3025         uint32_t chap_buf_size;
3026         int len, err = 0;
3027         char *buf;
3028
3029         if (!transport->get_chap)
3030                 return -EINVAL;
3031
3032         priv = iscsi_if_transport_lookup(transport);
3033         if (!priv)
3034                 return -EINVAL;
3035
3036         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3037         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3038
3039         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3040         if (!shost) {
3041                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3042                        __func__, ev->u.get_chap.host_no);
3043                 return -ENODEV;
3044         }
3045
3046         do {
3047                 int actual_size;
3048
3049                 skbchap = alloc_skb(len, GFP_KERNEL);
3050                 if (!skbchap) {
3051                         printk(KERN_ERR "can not deliver chap: OOM\n");
3052                         err = -ENOMEM;
3053                         goto exit_get_chap;
3054                 }
3055
3056                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3057                                       (len - sizeof(*nlhchap)), 0);
3058                 evchap = nlmsg_data(nlhchap);
3059                 memset(evchap, 0, sizeof(*evchap));
3060                 evchap->transport_handle = iscsi_handle(transport);
3061                 evchap->type = nlh->nlmsg_type;
3062                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3063                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3064                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3065                 buf = (char *)evchap + sizeof(*evchap);
3066                 memset(buf, 0, chap_buf_size);
3067
3068                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3069                                     &evchap->u.get_chap.num_entries, buf);
3070
3071                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3072                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3073                 nlhchap->nlmsg_len = actual_size;
3074
3075                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3076                                           GFP_KERNEL);
3077         } while (err < 0 && err != -ECONNREFUSED);
3078
3079 exit_get_chap:
3080         scsi_host_put(shost);
3081         return err;
3082 }
3083
3084 static int iscsi_set_chap(struct iscsi_transport *transport,
3085                           struct iscsi_uevent *ev, uint32_t len)
3086 {
3087         char *data = (char *)ev + sizeof(*ev);
3088         struct Scsi_Host *shost;
3089         int err = 0;
3090
3091         if (!transport->set_chap)
3092                 return -ENOSYS;
3093
3094         shost = scsi_host_lookup(ev->u.set_path.host_no);
3095         if (!shost) {
3096                 pr_err("%s could not find host no %u\n",
3097                        __func__, ev->u.set_path.host_no);
3098                 return -ENODEV;
3099         }
3100
3101         err = transport->set_chap(shost, data, len);
3102         scsi_host_put(shost);
3103         return err;
3104 }
3105
3106 static int iscsi_delete_chap(struct iscsi_transport *transport,
3107                              struct iscsi_uevent *ev)
3108 {
3109         struct Scsi_Host *shost;
3110         int err = 0;
3111
3112         if (!transport->delete_chap)
3113                 return -ENOSYS;
3114
3115         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3116         if (!shost) {
3117                 printk(KERN_ERR "%s could not find host no %u\n",
3118                        __func__, ev->u.delete_chap.host_no);
3119                 return -ENODEV;
3120         }
3121
3122         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3123         scsi_host_put(shost);
3124         return err;
3125 }
3126
3127 static const struct {
3128         enum iscsi_discovery_parent_type value;
3129         char                            *name;
3130 } iscsi_discovery_parent_names[] = {
3131         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3132         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3133         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3134 };
3135
3136 char *iscsi_get_discovery_parent_name(int parent_type)
3137 {
3138         int i;
3139         char *state = "Unknown!";
3140
3141         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3142                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3143                         state = iscsi_discovery_parent_names[i].name;
3144                         break;
3145                 }
3146         }
3147         return state;
3148 }
3149 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3150
3151 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3152                                      struct iscsi_uevent *ev, uint32_t len)
3153 {
3154         char *data = (char *)ev + sizeof(*ev);
3155         struct Scsi_Host *shost;
3156         struct iscsi_bus_flash_session *fnode_sess;
3157         struct iscsi_bus_flash_conn *fnode_conn;
3158         struct device *dev;
3159         uint32_t idx;
3160         int err = 0;
3161
3162         if (!transport->set_flashnode_param) {
3163                 err = -ENOSYS;
3164                 goto exit_set_fnode;
3165         }
3166
3167         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3168         if (!shost) {
3169                 pr_err("%s could not find host no %u\n",
3170                        __func__, ev->u.set_flashnode.host_no);
3171                 err = -ENODEV;
3172                 goto put_host;
3173         }
3174
3175         idx = ev->u.set_flashnode.flashnode_idx;
3176         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3177         if (!fnode_sess) {
3178                 pr_err("%s could not find flashnode %u for host no %u\n",
3179                        __func__, idx, ev->u.set_flashnode.host_no);
3180                 err = -ENODEV;
3181                 goto put_host;
3182         }
3183
3184         dev = iscsi_find_flashnode_conn(fnode_sess);
3185         if (!dev) {
3186                 err = -ENODEV;
3187                 goto put_sess;
3188         }
3189
3190         fnode_conn = iscsi_dev_to_flash_conn(dev);
3191         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3192         put_device(dev);
3193
3194 put_sess:
3195         put_device(&fnode_sess->dev);
3196
3197 put_host:
3198         scsi_host_put(shost);
3199
3200 exit_set_fnode:
3201         return err;
3202 }
3203
3204 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3205                                struct iscsi_uevent *ev, uint32_t len)
3206 {
3207         char *data = (char *)ev + sizeof(*ev);
3208         struct Scsi_Host *shost;
3209         int index;
3210         int err = 0;
3211
3212         if (!transport->new_flashnode) {
3213                 err = -ENOSYS;
3214                 goto exit_new_fnode;
3215         }
3216
3217         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3218         if (!shost) {
3219                 pr_err("%s could not find host no %u\n",
3220                        __func__, ev->u.new_flashnode.host_no);
3221                 err = -ENODEV;
3222                 goto put_host;
3223         }
3224
3225         index = transport->new_flashnode(shost, data, len);
3226
3227         if (index >= 0)
3228                 ev->r.new_flashnode_ret.flashnode_idx = index;
3229         else
3230                 err = -EIO;
3231
3232 put_host:
3233         scsi_host_put(shost);
3234
3235 exit_new_fnode:
3236         return err;
3237 }
3238
3239 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3240                                struct iscsi_uevent *ev)
3241 {
3242         struct Scsi_Host *shost;
3243         struct iscsi_bus_flash_session *fnode_sess;
3244         uint32_t idx;
3245         int err = 0;
3246
3247         if (!transport->del_flashnode) {
3248                 err = -ENOSYS;
3249                 goto exit_del_fnode;
3250         }
3251
3252         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3253         if (!shost) {
3254                 pr_err("%s could not find host no %u\n",
3255                        __func__, ev->u.del_flashnode.host_no);
3256                 err = -ENODEV;
3257                 goto put_host;
3258         }
3259
3260         idx = ev->u.del_flashnode.flashnode_idx;
3261         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3262         if (!fnode_sess) {
3263                 pr_err("%s could not find flashnode %u for host no %u\n",
3264                        __func__, idx, ev->u.del_flashnode.host_no);
3265                 err = -ENODEV;
3266                 goto put_host;
3267         }
3268
3269         err = transport->del_flashnode(fnode_sess);
3270         put_device(&fnode_sess->dev);
3271
3272 put_host:
3273         scsi_host_put(shost);
3274
3275 exit_del_fnode:
3276         return err;
3277 }
3278
3279 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3280                                  struct iscsi_uevent *ev)
3281 {
3282         struct Scsi_Host *shost;
3283         struct iscsi_bus_flash_session *fnode_sess;
3284         struct iscsi_bus_flash_conn *fnode_conn;
3285         struct device *dev;
3286         uint32_t idx;
3287         int err = 0;
3288
3289         if (!transport->login_flashnode) {
3290                 err = -ENOSYS;
3291                 goto exit_login_fnode;
3292         }
3293
3294         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3295         if (!shost) {
3296                 pr_err("%s could not find host no %u\n",
3297                        __func__, ev->u.login_flashnode.host_no);
3298                 err = -ENODEV;
3299                 goto put_host;
3300         }
3301
3302         idx = ev->u.login_flashnode.flashnode_idx;
3303         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3304         if (!fnode_sess) {
3305                 pr_err("%s could not find flashnode %u for host no %u\n",
3306                        __func__, idx, ev->u.login_flashnode.host_no);
3307                 err = -ENODEV;
3308                 goto put_host;
3309         }
3310
3311         dev = iscsi_find_flashnode_conn(fnode_sess);
3312         if (!dev) {
3313                 err = -ENODEV;
3314                 goto put_sess;
3315         }
3316
3317         fnode_conn = iscsi_dev_to_flash_conn(dev);
3318         err = transport->login_flashnode(fnode_sess, fnode_conn);
3319         put_device(dev);
3320
3321 put_sess:
3322         put_device(&fnode_sess->dev);
3323
3324 put_host:
3325         scsi_host_put(shost);
3326
3327 exit_login_fnode:
3328         return err;
3329 }
3330
3331 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3332                                   struct iscsi_uevent *ev)
3333 {
3334         struct Scsi_Host *shost;
3335         struct iscsi_bus_flash_session *fnode_sess;
3336         struct iscsi_bus_flash_conn *fnode_conn;
3337         struct device *dev;
3338         uint32_t idx;
3339         int err = 0;
3340
3341         if (!transport->logout_flashnode) {
3342                 err = -ENOSYS;
3343                 goto exit_logout_fnode;
3344         }
3345
3346         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3347         if (!shost) {
3348                 pr_err("%s could not find host no %u\n",
3349                        __func__, ev->u.logout_flashnode.host_no);
3350                 err = -ENODEV;
3351                 goto put_host;
3352         }
3353
3354         idx = ev->u.logout_flashnode.flashnode_idx;
3355         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3356         if (!fnode_sess) {
3357                 pr_err("%s could not find flashnode %u for host no %u\n",
3358                        __func__, idx, ev->u.logout_flashnode.host_no);
3359                 err = -ENODEV;
3360                 goto put_host;
3361         }
3362
3363         dev = iscsi_find_flashnode_conn(fnode_sess);
3364         if (!dev) {
3365                 err = -ENODEV;
3366                 goto put_sess;
3367         }
3368
3369         fnode_conn = iscsi_dev_to_flash_conn(dev);
3370
3371         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3372         put_device(dev);
3373
3374 put_sess:
3375         put_device(&fnode_sess->dev);
3376
3377 put_host:
3378         scsi_host_put(shost);
3379
3380 exit_logout_fnode:
3381         return err;
3382 }
3383
3384 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3385                                       struct iscsi_uevent *ev)
3386 {
3387         struct Scsi_Host *shost;
3388         struct iscsi_cls_session *session;
3389         int err = 0;
3390
3391         if (!transport->logout_flashnode_sid) {
3392                 err = -ENOSYS;
3393                 goto exit_logout_sid;
3394         }
3395
3396         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3397         if (!shost) {
3398                 pr_err("%s could not find host no %u\n",
3399                        __func__, ev->u.logout_flashnode.host_no);
3400                 err = -ENODEV;
3401                 goto put_host;
3402         }
3403
3404         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3405         if (!session) {
3406                 pr_err("%s could not find session id %u\n",
3407                        __func__, ev->u.logout_flashnode_sid.sid);
3408                 err = -EINVAL;
3409                 goto put_host;
3410         }
3411
3412         err = transport->logout_flashnode_sid(session);
3413
3414 put_host:
3415         scsi_host_put(shost);
3416
3417 exit_logout_sid:
3418         return err;
3419 }
3420
3421 static int
3422 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3423 {
3424         struct iscsi_uevent *ev = nlmsg_data(nlh);
3425         struct Scsi_Host *shost = NULL;
3426         struct iscsi_internal *priv;
3427         struct sk_buff *skbhost_stats;
3428         struct nlmsghdr *nlhhost_stats;
3429         struct iscsi_uevent *evhost_stats;
3430         int host_stats_size = 0;
3431         int len, err = 0;
3432         char *buf;
3433
3434         if (!transport->get_host_stats)
3435                 return -ENOSYS;
3436
3437         priv = iscsi_if_transport_lookup(transport);
3438         if (!priv)
3439                 return -EINVAL;
3440
3441         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3442         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3443
3444         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3445         if (!shost) {
3446                 pr_err("%s: failed. Cound not find host no %u\n",
3447                        __func__, ev->u.get_host_stats.host_no);
3448                 return -ENODEV;
3449         }
3450
3451         do {
3452                 int actual_size;
3453
3454                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3455                 if (!skbhost_stats) {
3456                         pr_err("cannot deliver host stats: OOM\n");
3457                         err = -ENOMEM;
3458                         goto exit_host_stats;
3459                 }
3460
3461                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3462                                       (len - sizeof(*nlhhost_stats)), 0);
3463                 evhost_stats = nlmsg_data(nlhhost_stats);
3464                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3465                 evhost_stats->transport_handle = iscsi_handle(transport);
3466                 evhost_stats->type = nlh->nlmsg_type;
3467                 evhost_stats->u.get_host_stats.host_no =
3468                                         ev->u.get_host_stats.host_no;
3469                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3470                 memset(buf, 0, host_stats_size);
3471
3472                 err = transport->get_host_stats(shost, buf, host_stats_size);
3473                 if (err) {
3474                         kfree_skb(skbhost_stats);
3475                         goto exit_host_stats;
3476                 }
3477
3478                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3479                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3480                 nlhhost_stats->nlmsg_len = actual_size;
3481
3482                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3483                                           GFP_KERNEL);
3484         } while (err < 0 && err != -ECONNREFUSED);
3485
3486 exit_host_stats:
3487         scsi_host_put(shost);
3488         return err;
3489 }
3490
3491
3492 static int
3493 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3494 {
3495         int err = 0;
3496         struct iscsi_uevent *ev = nlmsg_data(nlh);
3497         struct iscsi_transport *transport = NULL;
3498         struct iscsi_internal *priv;
3499         struct iscsi_cls_session *session;
3500         struct iscsi_cls_conn *conn;
3501         struct iscsi_endpoint *ep = NULL;
3502
3503         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3504                 *group = ISCSI_NL_GRP_UIP;
3505         else
3506                 *group = ISCSI_NL_GRP_ISCSID;
3507
3508         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3509         if (!priv)
3510                 return -EINVAL;
3511         transport = priv->iscsi_transport;
3512
3513         if (!try_module_get(transport->owner))
3514                 return -EINVAL;
3515
3516         switch (nlh->nlmsg_type) {
3517         case ISCSI_UEVENT_CREATE_SESSION:
3518                 err = iscsi_if_create_session(priv, ep, ev,
3519                                               NETLINK_CB(skb).portid,
3520                                               ev->u.c_session.initial_cmdsn,
3521                                               ev->u.c_session.cmds_max,
3522                                               ev->u.c_session.queue_depth);
3523                 break;
3524         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3525                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3526                 if (!ep) {
3527                         err = -EINVAL;
3528                         break;
3529                 }
3530
3531                 err = iscsi_if_create_session(priv, ep, ev,
3532                                         NETLINK_CB(skb).portid,
3533                                         ev->u.c_bound_session.initial_cmdsn,
3534                                         ev->u.c_bound_session.cmds_max,
3535                                         ev->u.c_bound_session.queue_depth);
3536                 break;
3537         case ISCSI_UEVENT_DESTROY_SESSION:
3538                 session = iscsi_session_lookup(ev->u.d_session.sid);
3539                 if (session)
3540                         transport->destroy_session(session);
3541                 else
3542                         err = -EINVAL;
3543                 break;
3544         case ISCSI_UEVENT_UNBIND_SESSION:
3545                 session = iscsi_session_lookup(ev->u.d_session.sid);
3546                 if (session)
3547                         scsi_queue_work(iscsi_session_to_shost(session),
3548                                         &session->unbind_work);
3549                 else
3550                         err = -EINVAL;
3551                 break;
3552         case ISCSI_UEVENT_CREATE_CONN:
3553                 err = iscsi_if_create_conn(transport, ev);
3554                 break;
3555         case ISCSI_UEVENT_DESTROY_CONN:
3556                 err = iscsi_if_destroy_conn(transport, ev);
3557                 break;
3558         case ISCSI_UEVENT_BIND_CONN:
3559                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3560                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3561
3562                 if (conn && conn->ep)
3563                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3564
3565                 if (!session || !conn) {
3566                         err = -EINVAL;
3567                         break;
3568                 }
3569
3570                 ev->r.retcode = transport->bind_conn(session, conn,
3571                                                 ev->u.b_conn.transport_eph,
3572                                                 ev->u.b_conn.is_leading);
3573                 if (ev->r.retcode || !transport->ep_connect)
3574                         break;
3575
3576                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3577                 if (ep) {
3578                         ep->conn = conn;
3579
3580                         mutex_lock(&conn->ep_mutex);
3581                         conn->ep = ep;
3582                         mutex_unlock(&conn->ep_mutex);
3583                 } else
3584                         iscsi_cls_conn_printk(KERN_ERR, conn,
3585                                               "Could not set ep conn "
3586                                               "binding\n");
3587                 break;
3588         case ISCSI_UEVENT_SET_PARAM:
3589                 err = iscsi_set_param(transport, ev);
3590                 break;
3591         case ISCSI_UEVENT_START_CONN:
3592                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3593                 if (conn)
3594                         ev->r.retcode = transport->start_conn(conn);
3595                 else
3596                         err = -EINVAL;
3597                 break;
3598         case ISCSI_UEVENT_STOP_CONN:
3599                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3600                 if (conn)
3601                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3602                 else
3603                         err = -EINVAL;
3604                 break;
3605         case ISCSI_UEVENT_SEND_PDU:
3606                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3607                 if (conn)
3608                         ev->r.retcode = transport->send_pdu(conn,
3609                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3610                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3611                                 ev->u.send_pdu.data_size);
3612                 else
3613                         err = -EINVAL;
3614                 break;
3615         case ISCSI_UEVENT_GET_STATS:
3616                 err = iscsi_if_get_stats(transport, nlh);
3617                 break;
3618         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3619         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3620         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3621         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3622                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3623                 break;
3624         case ISCSI_UEVENT_TGT_DSCVR:
3625                 err = iscsi_tgt_dscvr(transport, ev);
3626                 break;
3627         case ISCSI_UEVENT_SET_HOST_PARAM:
3628                 err = iscsi_set_host_param(transport, ev);
3629                 break;
3630         case ISCSI_UEVENT_PATH_UPDATE:
3631                 err = iscsi_set_path(transport, ev);
3632                 break;
3633         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3634                 err = iscsi_set_iface_params(transport, ev,
3635                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3636                 break;
3637         case ISCSI_UEVENT_PING:
3638                 err = iscsi_send_ping(transport, ev);
3639                 break;
3640         case ISCSI_UEVENT_GET_CHAP:
3641                 err = iscsi_get_chap(transport, nlh);
3642                 break;
3643         case ISCSI_UEVENT_DELETE_CHAP:
3644                 err = iscsi_delete_chap(transport, ev);
3645                 break;
3646         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3647                 err = iscsi_set_flashnode_param(transport, ev,
3648                                                 nlmsg_attrlen(nlh,
3649                                                               sizeof(*ev)));
3650                 break;
3651         case ISCSI_UEVENT_NEW_FLASHNODE:
3652                 err = iscsi_new_flashnode(transport, ev,
3653                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3654                 break;
3655         case ISCSI_UEVENT_DEL_FLASHNODE:
3656                 err = iscsi_del_flashnode(transport, ev);
3657                 break;
3658         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3659                 err = iscsi_login_flashnode(transport, ev);
3660                 break;
3661         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3662                 err = iscsi_logout_flashnode(transport, ev);
3663                 break;
3664         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3665                 err = iscsi_logout_flashnode_sid(transport, ev);
3666                 break;
3667         case ISCSI_UEVENT_SET_CHAP:
3668                 err = iscsi_set_chap(transport, ev,
3669                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3670                 break;
3671         case ISCSI_UEVENT_GET_HOST_STATS:
3672                 err = iscsi_get_host_stats(transport, nlh);
3673                 break;
3674         default:
3675                 err = -ENOSYS;
3676                 break;
3677         }
3678
3679         module_put(transport->owner);
3680         return err;
3681 }
3682
3683 /*
3684  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3685  * Malformed skbs with wrong lengths or invalid creds are not processed.
3686  */
3687 static void
3688 iscsi_if_rx(struct sk_buff *skb)
3689 {
3690         mutex_lock(&rx_queue_mutex);
3691         while (skb->len >= NLMSG_HDRLEN) {
3692                 int err;
3693                 uint32_t rlen;
3694                 struct nlmsghdr *nlh;
3695                 struct iscsi_uevent *ev;
3696                 uint32_t group;
3697
3698                 nlh = nlmsg_hdr(skb);
3699                 if (nlh->nlmsg_len < sizeof(*nlh) ||
3700                     skb->len < nlh->nlmsg_len) {
3701                         break;
3702                 }
3703
3704                 ev = nlmsg_data(nlh);
3705                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3706                 if (rlen > skb->len)
3707                         rlen = skb->len;
3708
3709                 err = iscsi_if_recv_msg(skb, nlh, &group);
3710                 if (err) {
3711                         ev->type = ISCSI_KEVENT_IF_ERROR;
3712                         ev->iferror = err;
3713                 }
3714                 do {
3715                         /*
3716                          * special case for GET_STATS:
3717                          * on success - sending reply and stats from
3718                          * inside of if_recv_msg(),
3719                          * on error - fall through.
3720                          */
3721                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3722                                 break;
3723                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3724                                 break;
3725                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
3726                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
3727                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3728                 skb_pull(skb, rlen);
3729         }
3730         mutex_unlock(&rx_queue_mutex);
3731 }
3732
3733 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3734 struct device_attribute dev_attr_##_prefix##_##_name =  \
3735         __ATTR(_name,_mode,_show,_store)
3736
3737 /*
3738  * iSCSI connection attrs
3739  */
3740 #define iscsi_conn_attr_show(param)                                     \
3741 static ssize_t                                                          \
3742 show_conn_param_##param(struct device *dev,                             \
3743                         struct device_attribute *attr, char *buf)       \
3744 {                                                                       \
3745         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3746         struct iscsi_transport *t = conn->transport;                    \
3747         return t->get_conn_param(conn, param, buf);                     \
3748 }
3749
3750 #define iscsi_conn_attr(field, param)                                   \
3751         iscsi_conn_attr_show(param)                                     \
3752 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3753                         NULL);
3754
3755 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3756 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3757 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3758 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3759 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3760 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3761 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3762 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3763 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3764 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3765 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3766 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3767 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3768 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3769 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3770 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3771 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3772 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3773 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3774 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3775 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3776 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3777 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3778 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3779 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3780 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3781 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3782 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3783
3784
3785 #define iscsi_conn_ep_attr_show(param)                                  \
3786 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3787                                           struct device_attribute *attr,\
3788                                           char *buf)                    \
3789 {                                                                       \
3790         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3791         struct iscsi_transport *t = conn->transport;                    \
3792         struct iscsi_endpoint *ep;                                      \
3793         ssize_t rc;                                                     \
3794                                                                         \
3795         /*                                                              \
3796          * Need to make sure ep_disconnect does not free the LLD's      \
3797          * interconnect resources while we are trying to read them.     \
3798          */                                                             \
3799         mutex_lock(&conn->ep_mutex);                                    \
3800         ep = conn->ep;                                                  \
3801         if (!ep && t->ep_connect) {                                     \
3802                 mutex_unlock(&conn->ep_mutex);                          \
3803                 return -ENOTCONN;                                       \
3804         }                                                               \
3805                                                                         \
3806         if (ep)                                                         \
3807                 rc = t->get_ep_param(ep, param, buf);                   \
3808         else                                                            \
3809                 rc = t->get_conn_param(conn, param, buf);               \
3810         mutex_unlock(&conn->ep_mutex);                                  \
3811         return rc;                                                      \
3812 }
3813
3814 #define iscsi_conn_ep_attr(field, param)                                \
3815         iscsi_conn_ep_attr_show(param)                                  \
3816 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3817                         show_conn_ep_param_##param, NULL);
3818
3819 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3820 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3821
3822 static struct attribute *iscsi_conn_attrs[] = {
3823         &dev_attr_conn_max_recv_dlength.attr,
3824         &dev_attr_conn_max_xmit_dlength.attr,
3825         &dev_attr_conn_header_digest.attr,
3826         &dev_attr_conn_data_digest.attr,
3827         &dev_attr_conn_ifmarker.attr,
3828         &dev_attr_conn_ofmarker.attr,
3829         &dev_attr_conn_address.attr,
3830         &dev_attr_conn_port.attr,
3831         &dev_attr_conn_exp_statsn.attr,
3832         &dev_attr_conn_persistent_address.attr,
3833         &dev_attr_conn_persistent_port.attr,
3834         &dev_attr_conn_ping_tmo.attr,
3835         &dev_attr_conn_recv_tmo.attr,
3836         &dev_attr_conn_local_port.attr,
3837         &dev_attr_conn_statsn.attr,
3838         &dev_attr_conn_keepalive_tmo.attr,
3839         &dev_attr_conn_max_segment_size.attr,
3840         &dev_attr_conn_tcp_timestamp_stat.attr,
3841         &dev_attr_conn_tcp_wsf_disable.attr,
3842         &dev_attr_conn_tcp_nagle_disable.attr,
3843         &dev_attr_conn_tcp_timer_scale.attr,
3844         &dev_attr_conn_tcp_timestamp_enable.attr,
3845         &dev_attr_conn_fragment_disable.attr,
3846         &dev_attr_conn_ipv4_tos.attr,
3847         &dev_attr_conn_ipv6_traffic_class.attr,
3848         &dev_attr_conn_ipv6_flow_label.attr,
3849         &dev_attr_conn_is_fw_assigned_ipv6.attr,
3850         &dev_attr_conn_tcp_xmit_wsf.attr,
3851         &dev_attr_conn_tcp_recv_wsf.attr,
3852         &dev_attr_conn_local_ipaddr.attr,
3853         NULL,
3854 };
3855
3856 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3857                                          struct attribute *attr, int i)
3858 {
3859         struct device *cdev = container_of(kobj, struct device, kobj);
3860         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3861         struct iscsi_transport *t = conn->transport;
3862         int param;
3863
3864         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3865                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3866         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3867                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3868         else if (attr == &dev_attr_conn_header_digest.attr)
3869                 param = ISCSI_PARAM_HDRDGST_EN;
3870         else if (attr == &dev_attr_conn_data_digest.attr)
3871                 param = ISCSI_PARAM_DATADGST_EN;
3872         else if (attr == &dev_attr_conn_ifmarker.attr)
3873                 param = ISCSI_PARAM_IFMARKER_EN;
3874         else if (attr == &dev_attr_conn_ofmarker.attr)
3875                 param = ISCSI_PARAM_OFMARKER_EN;
3876         else if (attr == &dev_attr_conn_address.attr)
3877                 param = ISCSI_PARAM_CONN_ADDRESS;
3878         else if (attr == &dev_attr_conn_port.attr)
3879                 param = ISCSI_PARAM_CONN_PORT;
3880         else if (attr == &dev_attr_conn_exp_statsn.attr)
3881                 param = ISCSI_PARAM_EXP_STATSN;
3882         else if (attr == &dev_attr_conn_persistent_address.attr)
3883                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3884         else if (attr == &dev_attr_conn_persistent_port.attr)
3885                 param = ISCSI_PARAM_PERSISTENT_PORT;
3886         else if (attr == &dev_attr_conn_ping_tmo.attr)
3887                 param = ISCSI_PARAM_PING_TMO;
3888         else if (attr == &dev_attr_conn_recv_tmo.attr)
3889                 param = ISCSI_PARAM_RECV_TMO;
3890         else if (attr == &dev_attr_conn_local_port.attr)
3891                 param = ISCSI_PARAM_LOCAL_PORT;
3892         else if (attr == &dev_attr_conn_statsn.attr)
3893                 param = ISCSI_PARAM_STATSN;
3894         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3895                 param = ISCSI_PARAM_KEEPALIVE_TMO;
3896         else if (attr == &dev_attr_conn_max_segment_size.attr)
3897                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3898         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3899                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3900         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3901                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
3902         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3903                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3904         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3905                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
3906         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3907                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3908         else if (attr == &dev_attr_conn_fragment_disable.attr)
3909                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3910         else if (attr == &dev_attr_conn_ipv4_tos.attr)
3911                 param = ISCSI_PARAM_IPV4_TOS;
3912         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3913                 param = ISCSI_PARAM_IPV6_TC;
3914         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3915                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3916         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3917                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3918         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3919                 param = ISCSI_PARAM_TCP_XMIT_WSF;
3920         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3921                 param = ISCSI_PARAM_TCP_RECV_WSF;
3922         else if (attr == &dev_attr_conn_local_ipaddr.attr)
3923                 param = ISCSI_PARAM_LOCAL_IPADDR;
3924         else {
3925                 WARN_ONCE(1, "Invalid conn attr");
3926                 return 0;
3927         }
3928
3929         return t->attr_is_visible(ISCSI_PARAM, param);
3930 }
3931
3932 static struct attribute_group iscsi_conn_group = {
3933         .attrs = iscsi_conn_attrs,
3934         .is_visible = iscsi_conn_attr_is_visible,
3935 };
3936
3937 /*
3938  * iSCSI session attrs
3939  */
3940 #define iscsi_session_attr_show(param, perm)                            \
3941 static ssize_t                                                          \
3942 show_session_param_##param(struct device *dev,                          \
3943                            struct device_attribute *attr, char *buf)    \
3944 {                                                                       \
3945         struct iscsi_cls_session *session =                             \
3946                 iscsi_dev_to_session(dev->parent);                      \
3947         struct iscsi_transport *t = session->transport;                 \
3948                                                                         \
3949         if (perm && !capable(CAP_SYS_ADMIN))                            \
3950                 return -EACCES;                                         \
3951         return t->get_session_param(session, param, buf);               \
3952 }
3953
3954 #define iscsi_session_attr(field, param, perm)                          \
3955         iscsi_session_attr_show(param, perm)                            \
3956 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3957                         NULL);
3958 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3959 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3960 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3961 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3962 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3963 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3964 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3965 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3966 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3967 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3968 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3969 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3970 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
3971 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
3972 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
3973 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
3974 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
3975 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
3976 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3977 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
3978 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3979 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
3980 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
3981 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
3982 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
3983 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
3984 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
3985 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
3986 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
3987 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
3988 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
3989 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
3990 iscsi_session_attr(discovery_auth_optional,
3991                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
3992 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
3993 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
3994 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
3995 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
3996 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
3997 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
3998 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
3999
4000 static ssize_t
4001 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4002                         char *buf)
4003 {
4004         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4005         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4006 }
4007 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4008                         NULL);
4009 static ssize_t
4010 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4011                         char *buf)
4012 {
4013         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4014         return sprintf(buf, "%d\n", session->creator);
4015 }
4016 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4017                         NULL);
4018 static ssize_t
4019 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4020                             char *buf)
4021 {
4022         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4023         return sprintf(buf, "%d\n", session->target_id);
4024 }
4025 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4026                         show_priv_session_target_id, NULL);
4027
4028 #define iscsi_priv_session_attr_show(field, format)                     \
4029 static ssize_t                                                          \
4030 show_priv_session_##field(struct device *dev,                           \
4031                           struct device_attribute *attr, char *buf)     \
4032 {                                                                       \
4033         struct iscsi_cls_session *session =                             \
4034                         iscsi_dev_to_session(dev->parent);              \
4035         if (session->field == -1)                                       \
4036                 return sprintf(buf, "off\n");                           \
4037         return sprintf(buf, format"\n", session->field);                \
4038 }
4039
4040 #define iscsi_priv_session_attr_store(field)                            \
4041 static ssize_t                                                          \
4042 store_priv_session_##field(struct device *dev,                          \
4043                            struct device_attribute *attr,               \
4044                            const char *buf, size_t count)               \
4045 {                                                                       \
4046         int val;                                                        \
4047         char *cp;                                                       \
4048         struct iscsi_cls_session *session =                             \
4049                 iscsi_dev_to_session(dev->parent);                      \
4050         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4051             (session->state == ISCSI_SESSION_FAILED))                   \
4052                 return -EBUSY;                                          \
4053         if (strncmp(buf, "off", 3) == 0) {                              \
4054                 session->field = -1;                                    \
4055                 session->field##_sysfs_override = true;                 \
4056         } else {                                                        \
4057                 val = simple_strtoul(buf, &cp, 0);                      \
4058                 if (*cp != '\0' && *cp != '\n')                         \
4059                         return -EINVAL;                                 \
4060                 session->field = val;                                   \
4061                 session->field##_sysfs_override = true;                 \
4062         }                                                               \
4063         return count;                                                   \
4064 }
4065
4066 #define iscsi_priv_session_rw_attr(field, format)                       \
4067         iscsi_priv_session_attr_show(field, format)                     \
4068         iscsi_priv_session_attr_store(field)                            \
4069 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4070                         show_priv_session_##field,                      \
4071                         store_priv_session_##field)
4072
4073 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4074
4075 static struct attribute *iscsi_session_attrs[] = {
4076         &dev_attr_sess_initial_r2t.attr,
4077         &dev_attr_sess_max_outstanding_r2t.attr,
4078         &dev_attr_sess_immediate_data.attr,
4079         &dev_attr_sess_first_burst_len.attr,
4080         &dev_attr_sess_max_burst_len.attr,
4081         &dev_attr_sess_data_pdu_in_order.attr,
4082         &dev_attr_sess_data_seq_in_order.attr,
4083         &dev_attr_sess_erl.attr,
4084         &dev_attr_sess_targetname.attr,
4085         &dev_attr_sess_tpgt.attr,
4086         &dev_attr_sess_password.attr,
4087         &dev_attr_sess_password_in.attr,
4088         &dev_attr_sess_username.attr,
4089         &dev_attr_sess_username_in.attr,
4090         &dev_attr_sess_fast_abort.attr,
4091         &dev_attr_sess_abort_tmo.attr,
4092         &dev_attr_sess_lu_reset_tmo.attr,
4093         &dev_attr_sess_tgt_reset_tmo.attr,
4094         &dev_attr_sess_ifacename.attr,
4095         &dev_attr_sess_initiatorname.attr,
4096         &dev_attr_sess_targetalias.attr,
4097         &dev_attr_sess_boot_root.attr,
4098         &dev_attr_sess_boot_nic.attr,
4099         &dev_attr_sess_boot_target.attr,
4100         &dev_attr_priv_sess_recovery_tmo.attr,
4101         &dev_attr_priv_sess_state.attr,
4102         &dev_attr_priv_sess_creator.attr,
4103         &dev_attr_sess_chap_out_idx.attr,
4104         &dev_attr_sess_chap_in_idx.attr,
4105         &dev_attr_priv_sess_target_id.attr,
4106         &dev_attr_sess_auto_snd_tgt_disable.attr,
4107         &dev_attr_sess_discovery_session.attr,
4108         &dev_attr_sess_portal_type.attr,
4109         &dev_attr_sess_chap_auth.attr,
4110         &dev_attr_sess_discovery_logout.attr,
4111         &dev_attr_sess_bidi_chap.attr,
4112         &dev_attr_sess_discovery_auth_optional.attr,
4113         &dev_attr_sess_def_time2wait.attr,
4114         &dev_attr_sess_def_time2retain.attr,
4115         &dev_attr_sess_isid.attr,
4116         &dev_attr_sess_tsid.attr,
4117         &dev_attr_sess_def_taskmgmt_tmo.attr,
4118         &dev_attr_sess_discovery_parent_idx.attr,
4119         &dev_attr_sess_discovery_parent_type.attr,
4120         NULL,
4121 };
4122
4123 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4124                                             struct attribute *attr, int i)
4125 {
4126         struct device *cdev = container_of(kobj, struct device, kobj);
4127         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4128         struct iscsi_transport *t = session->transport;
4129         int param;
4130
4131         if (attr == &dev_attr_sess_initial_r2t.attr)
4132                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4133         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4134                 param = ISCSI_PARAM_MAX_R2T;
4135         else if (attr == &dev_attr_sess_immediate_data.attr)
4136                 param = ISCSI_PARAM_IMM_DATA_EN;
4137         else if (attr == &dev_attr_sess_first_burst_len.attr)
4138                 param = ISCSI_PARAM_FIRST_BURST;
4139         else if (attr == &dev_attr_sess_max_burst_len.attr)
4140                 param = ISCSI_PARAM_MAX_BURST;
4141         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4142                 param = ISCSI_PARAM_PDU_INORDER_EN;
4143         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4144                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4145         else if (attr == &dev_attr_sess_erl.attr)
4146                 param = ISCSI_PARAM_ERL;
4147         else if (attr == &dev_attr_sess_targetname.attr)
4148                 param = ISCSI_PARAM_TARGET_NAME;
4149         else if (attr == &dev_attr_sess_tpgt.attr)
4150                 param = ISCSI_PARAM_TPGT;
4151         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4152                 param = ISCSI_PARAM_CHAP_IN_IDX;
4153         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4154                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4155         else if (attr == &dev_attr_sess_password.attr)
4156                 param = ISCSI_PARAM_USERNAME;
4157         else if (attr == &dev_attr_sess_password_in.attr)
4158                 param = ISCSI_PARAM_USERNAME_IN;
4159         else if (attr == &dev_attr_sess_username.attr)
4160                 param = ISCSI_PARAM_PASSWORD;
4161         else if (attr == &dev_attr_sess_username_in.attr)
4162                 param = ISCSI_PARAM_PASSWORD_IN;
4163         else if (attr == &dev_attr_sess_fast_abort.attr)
4164                 param = ISCSI_PARAM_FAST_ABORT;
4165         else if (attr == &dev_attr_sess_abort_tmo.attr)
4166                 param = ISCSI_PARAM_ABORT_TMO;
4167         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4168                 param = ISCSI_PARAM_LU_RESET_TMO;
4169         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4170                 param = ISCSI_PARAM_TGT_RESET_TMO;
4171         else if (attr == &dev_attr_sess_ifacename.attr)
4172                 param = ISCSI_PARAM_IFACE_NAME;
4173         else if (attr == &dev_attr_sess_initiatorname.attr)
4174                 param = ISCSI_PARAM_INITIATOR_NAME;
4175         else if (attr == &dev_attr_sess_targetalias.attr)
4176                 param = ISCSI_PARAM_TARGET_ALIAS;
4177         else if (attr == &dev_attr_sess_boot_root.attr)
4178                 param = ISCSI_PARAM_BOOT_ROOT;
4179         else if (attr == &dev_attr_sess_boot_nic.attr)
4180                 param = ISCSI_PARAM_BOOT_NIC;
4181         else if (attr == &dev_attr_sess_boot_target.attr)
4182                 param = ISCSI_PARAM_BOOT_TARGET;
4183         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4184                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4185         else if (attr == &dev_attr_sess_discovery_session.attr)
4186                 param = ISCSI_PARAM_DISCOVERY_SESS;
4187         else if (attr == &dev_attr_sess_portal_type.attr)
4188                 param = ISCSI_PARAM_PORTAL_TYPE;
4189         else if (attr == &dev_attr_sess_chap_auth.attr)
4190                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4191         else if (attr == &dev_attr_sess_discovery_logout.attr)
4192                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4193         else if (attr == &dev_attr_sess_bidi_chap.attr)
4194                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4195         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4196                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4197         else if (attr == &dev_attr_sess_def_time2wait.attr)
4198                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4199         else if (attr == &dev_attr_sess_def_time2retain.attr)
4200                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4201         else if (attr == &dev_attr_sess_isid.attr)
4202                 param = ISCSI_PARAM_ISID;
4203         else if (attr == &dev_attr_sess_tsid.attr)
4204                 param = ISCSI_PARAM_TSID;
4205         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4206                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4207         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4208                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4209         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4210                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4211         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4212                 return S_IRUGO | S_IWUSR;
4213         else if (attr == &dev_attr_priv_sess_state.attr)
4214                 return S_IRUGO;
4215         else if (attr == &dev_attr_priv_sess_creator.attr)
4216                 return S_IRUGO;
4217         else if (attr == &dev_attr_priv_sess_target_id.attr)
4218                 return S_IRUGO;
4219         else {
4220                 WARN_ONCE(1, "Invalid session attr");
4221                 return 0;
4222         }
4223
4224         return t->attr_is_visible(ISCSI_PARAM, param);
4225 }
4226
4227 static struct attribute_group iscsi_session_group = {
4228         .attrs = iscsi_session_attrs,
4229         .is_visible = iscsi_session_attr_is_visible,
4230 };
4231
4232 /*
4233  * iSCSI host attrs
4234  */
4235 #define iscsi_host_attr_show(param)                                     \
4236 static ssize_t                                                          \
4237 show_host_param_##param(struct device *dev,                             \
4238                         struct device_attribute *attr, char *buf)       \
4239 {                                                                       \
4240         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4241         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4242         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4243 }
4244
4245 #define iscsi_host_attr(field, param)                                   \
4246         iscsi_host_attr_show(param)                                     \
4247 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4248                         NULL);
4249
4250 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4251 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4252 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4253 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4254 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4255 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4256
4257 static struct attribute *iscsi_host_attrs[] = {
4258         &dev_attr_host_netdev.attr,
4259         &dev_attr_host_hwaddress.attr,
4260         &dev_attr_host_ipaddress.attr,
4261         &dev_attr_host_initiatorname.attr,
4262         &dev_attr_host_port_state.attr,
4263         &dev_attr_host_port_speed.attr,
4264         NULL,
4265 };
4266
4267 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4268                                          struct attribute *attr, int i)
4269 {
4270         struct device *cdev = container_of(kobj, struct device, kobj);
4271         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4272         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4273         int param;
4274
4275         if (attr == &dev_attr_host_netdev.attr)
4276                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4277         else if (attr == &dev_attr_host_hwaddress.attr)
4278                 param = ISCSI_HOST_PARAM_HWADDRESS;
4279         else if (attr == &dev_attr_host_ipaddress.attr)
4280                 param = ISCSI_HOST_PARAM_IPADDRESS;
4281         else if (attr == &dev_attr_host_initiatorname.attr)
4282                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4283         else if (attr == &dev_attr_host_port_state.attr)
4284                 param = ISCSI_HOST_PARAM_PORT_STATE;
4285         else if (attr == &dev_attr_host_port_speed.attr)
4286                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4287         else {
4288                 WARN_ONCE(1, "Invalid host attr");
4289                 return 0;
4290         }
4291
4292         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4293 }
4294
4295 static struct attribute_group iscsi_host_group = {
4296         .attrs = iscsi_host_attrs,
4297         .is_visible = iscsi_host_attr_is_visible,
4298 };
4299
4300 /* convert iscsi_port_speed values to ascii string name */
4301 static const struct {
4302         enum iscsi_port_speed   value;
4303         char                    *name;
4304 } iscsi_port_speed_names[] = {
4305         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4306         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4307         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4308         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4309         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4310         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4311         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4312 };
4313
4314 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4315 {
4316         int i;
4317         char *speed = "Unknown!";
4318         struct iscsi_cls_host *ihost = shost->shost_data;
4319         uint32_t port_speed = ihost->port_speed;
4320
4321         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4322                 if (iscsi_port_speed_names[i].value & port_speed) {
4323                         speed = iscsi_port_speed_names[i].name;
4324                         break;
4325                 }
4326         }
4327         return speed;
4328 }
4329 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4330
4331 /* convert iscsi_port_state values to ascii string name */
4332 static const struct {
4333         enum iscsi_port_state   value;
4334         char                    *name;
4335 } iscsi_port_state_names[] = {
4336         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4337         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4338 };
4339
4340 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4341 {
4342         int i;
4343         char *state = "Unknown!";
4344         struct iscsi_cls_host *ihost = shost->shost_data;
4345         uint32_t port_state = ihost->port_state;
4346
4347         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4348                 if (iscsi_port_state_names[i].value & port_state) {
4349                         state = iscsi_port_state_names[i].name;
4350                         break;
4351                 }
4352         }
4353         return state;
4354 }
4355 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4356
4357 static int iscsi_session_match(struct attribute_container *cont,
4358                            struct device *dev)
4359 {
4360         struct iscsi_cls_session *session;
4361         struct Scsi_Host *shost;
4362         struct iscsi_internal *priv;
4363
4364         if (!iscsi_is_session_dev(dev))
4365                 return 0;
4366
4367         session = iscsi_dev_to_session(dev);
4368         shost = iscsi_session_to_shost(session);
4369         if (!shost->transportt)
4370                 return 0;
4371
4372         priv = to_iscsi_internal(shost->transportt);
4373         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4374                 return 0;
4375
4376         return &priv->session_cont.ac == cont;
4377 }
4378
4379 static int iscsi_conn_match(struct attribute_container *cont,
4380                            struct device *dev)
4381 {
4382         struct iscsi_cls_session *session;
4383         struct iscsi_cls_conn *conn;
4384         struct Scsi_Host *shost;
4385         struct iscsi_internal *priv;
4386
4387         if (!iscsi_is_conn_dev(dev))
4388                 return 0;
4389
4390         conn = iscsi_dev_to_conn(dev);
4391         session = iscsi_dev_to_session(conn->dev.parent);
4392         shost = iscsi_session_to_shost(session);
4393
4394         if (!shost->transportt)
4395                 return 0;
4396
4397         priv = to_iscsi_internal(shost->transportt);
4398         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4399                 return 0;
4400
4401         return &priv->conn_cont.ac == cont;
4402 }
4403
4404 static int iscsi_host_match(struct attribute_container *cont,
4405                             struct device *dev)
4406 {
4407         struct Scsi_Host *shost;
4408         struct iscsi_internal *priv;
4409
4410         if (!scsi_is_host_device(dev))
4411                 return 0;
4412
4413         shost = dev_to_shost(dev);
4414         if (!shost->transportt  ||
4415             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4416                 return 0;
4417
4418         priv = to_iscsi_internal(shost->transportt);
4419         return &priv->t.host_attrs.ac == cont;
4420 }
4421
4422 struct scsi_transport_template *
4423 iscsi_register_transport(struct iscsi_transport *tt)
4424 {
4425         struct iscsi_internal *priv;
4426         unsigned long flags;
4427         int err;
4428
4429         BUG_ON(!tt);
4430
4431         priv = iscsi_if_transport_lookup(tt);
4432         if (priv)
4433                 return NULL;
4434
4435         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4436         if (!priv)
4437                 return NULL;
4438         INIT_LIST_HEAD(&priv->list);
4439         priv->iscsi_transport = tt;
4440         priv->t.user_scan = iscsi_user_scan;
4441         priv->t.create_work_queue = 1;
4442
4443         priv->dev.class = &iscsi_transport_class;
4444         dev_set_name(&priv->dev, "%s", tt->name);
4445         err = device_register(&priv->dev);
4446         if (err)
4447                 goto free_priv;
4448
4449         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4450         if (err)
4451                 goto unregister_dev;
4452
4453         /* host parameters */
4454         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4455         priv->t.host_attrs.ac.match = iscsi_host_match;
4456         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4457         priv->t.host_size = sizeof(struct iscsi_cls_host);
4458         transport_container_register(&priv->t.host_attrs);
4459
4460         /* connection parameters */
4461         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4462         priv->conn_cont.ac.match = iscsi_conn_match;
4463         priv->conn_cont.ac.grp = &iscsi_conn_group;
4464         transport_container_register(&priv->conn_cont);
4465
4466         /* session parameters */
4467         priv->session_cont.ac.class = &iscsi_session_class.class;
4468         priv->session_cont.ac.match = iscsi_session_match;
4469         priv->session_cont.ac.grp = &iscsi_session_group;
4470         transport_container_register(&priv->session_cont);
4471
4472         spin_lock_irqsave(&iscsi_transport_lock, flags);
4473         list_add(&priv->list, &iscsi_transports);
4474         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4475
4476         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4477         return &priv->t;
4478
4479 unregister_dev:
4480         device_unregister(&priv->dev);
4481         return NULL;
4482 free_priv:
4483         kfree(priv);
4484         return NULL;
4485 }
4486 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4487
4488 int iscsi_unregister_transport(struct iscsi_transport *tt)
4489 {
4490         struct iscsi_internal *priv;
4491         unsigned long flags;
4492
4493         BUG_ON(!tt);
4494
4495         mutex_lock(&rx_queue_mutex);
4496
4497         priv = iscsi_if_transport_lookup(tt);
4498         BUG_ON (!priv);
4499
4500         spin_lock_irqsave(&iscsi_transport_lock, flags);
4501         list_del(&priv->list);
4502         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4503
4504         transport_container_unregister(&priv->conn_cont);
4505         transport_container_unregister(&priv->session_cont);
4506         transport_container_unregister(&priv->t.host_attrs);
4507
4508         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4509         device_unregister(&priv->dev);
4510         mutex_unlock(&rx_queue_mutex);
4511
4512         return 0;
4513 }
4514 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4515
4516 static __init int iscsi_transport_init(void)
4517 {
4518         int err;
4519         struct netlink_kernel_cfg cfg = {
4520                 .groups = 1,
4521                 .input  = iscsi_if_rx,
4522         };
4523         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4524                 ISCSI_TRANSPORT_VERSION);
4525
4526         atomic_set(&iscsi_session_nr, 0);
4527
4528         err = class_register(&iscsi_transport_class);
4529         if (err)
4530                 return err;
4531
4532         err = class_register(&iscsi_endpoint_class);
4533         if (err)
4534                 goto unregister_transport_class;
4535
4536         err = class_register(&iscsi_iface_class);
4537         if (err)
4538                 goto unregister_endpoint_class;
4539
4540         err = transport_class_register(&iscsi_host_class);
4541         if (err)
4542                 goto unregister_iface_class;
4543
4544         err = transport_class_register(&iscsi_connection_class);
4545         if (err)
4546                 goto unregister_host_class;
4547
4548         err = transport_class_register(&iscsi_session_class);
4549         if (err)
4550                 goto unregister_conn_class;
4551
4552         err = bus_register(&iscsi_flashnode_bus);
4553         if (err)
4554                 goto unregister_session_class;
4555
4556         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4557         if (!nls) {
4558                 err = -ENOBUFS;
4559                 goto unregister_flashnode_bus;
4560         }
4561
4562         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4563         if (!iscsi_eh_timer_workq) {
4564                 err = -ENOMEM;
4565                 goto release_nls;
4566         }
4567
4568         return 0;
4569
4570 release_nls:
4571         netlink_kernel_release(nls);
4572 unregister_flashnode_bus:
4573         bus_unregister(&iscsi_flashnode_bus);
4574 unregister_session_class:
4575         transport_class_unregister(&iscsi_session_class);
4576 unregister_conn_class:
4577         transport_class_unregister(&iscsi_connection_class);
4578 unregister_host_class:
4579         transport_class_unregister(&iscsi_host_class);
4580 unregister_iface_class:
4581         class_unregister(&iscsi_iface_class);
4582 unregister_endpoint_class:
4583         class_unregister(&iscsi_endpoint_class);
4584 unregister_transport_class:
4585         class_unregister(&iscsi_transport_class);
4586         return err;
4587 }
4588
4589 static void __exit iscsi_transport_exit(void)
4590 {
4591         destroy_workqueue(iscsi_eh_timer_workq);
4592         netlink_kernel_release(nls);
4593         bus_unregister(&iscsi_flashnode_bus);
4594         transport_class_unregister(&iscsi_connection_class);
4595         transport_class_unregister(&iscsi_session_class);
4596         transport_class_unregister(&iscsi_host_class);
4597         class_unregister(&iscsi_endpoint_class);
4598         class_unregister(&iscsi_iface_class);
4599         class_unregister(&iscsi_transport_class);
4600 }
4601
4602 module_init(iscsi_transport_init);
4603 module_exit(iscsi_transport_exit);
4604
4605 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4606               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4607               "Alex Aizman <itn780@yahoo.com>");
4608 MODULE_DESCRIPTION("iSCSI Transport Interface");
4609 MODULE_LICENSE("GPL");
4610 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4611 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);