drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <net/ipv6.h>
  28 #include <net/ip6_route.h>
  29 #include <net/addrconf.h>
  30
  31 #include <linux/inetdevice.h>   /* ip_dev_find */
  32 #include <linux/module.h>
  33 #include <net/tcp.h>
  34
  35 static unsigned int dbg_level;
  36
  37 #include "libcxgbi.h"
  38
  39 #define DRV_MODULE_NAME         "libcxgbi"
  40 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  41 #define DRV_MODULE_VERSION      "0.9.0"
  42 #define DRV_MODULE_RELDATE      "Jun. 2010"
  43
  44 MODULE_AUTHOR("Chelsio Communications, Inc.");
  45 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  46 MODULE_VERSION(DRV_MODULE_VERSION);
  47 MODULE_LICENSE("GPL");
  48
  49 module_param(dbg_level, uint, 0644);
  50 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  51
  52
  53 /*
  54  * cxgbi device management
  55  * maintains a list of the cxgbi devices
  56  */
  57 static LIST_HEAD(cdev_list);
  58 static DEFINE_MUTEX(cdev_mutex);
  59
  60 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  61                                 unsigned int max_conn)
  62 {
  63         struct cxgbi_ports_map *pmap = &cdev->pmap;
  64
  65         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  66                                              sizeof(struct cxgbi_sock *),
  67                                              GFP_KERNEL);
  68         if (!pmap->port_csk) {
  69                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  70                 return -ENOMEM;
  71         }
  72
  73         pmap->max_connect = max_conn;
  74         pmap->sport_base = base;
  75         spin_lock_init(&pmap->lock);
  76         return 0;
  77 }
  78 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  79
  80 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  81 {
  82         struct cxgbi_ports_map *pmap = &cdev->pmap;
  83         struct cxgbi_sock *csk;
  84         int i;
  85
  86         for (i = 0; i < pmap->max_connect; i++) {
  87                 if (pmap->port_csk[i]) {
  88                         csk = pmap->port_csk[i];
  89                         pmap->port_csk[i] = NULL;
  90                         log_debug(1 << CXGBI_DBG_SOCK,
  91                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  92                                 csk, cdev);
  93                         spin_lock_bh(&csk->lock);
  94                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
  95                         cxgbi_sock_closed(csk);
  96                         spin_unlock_bh(&csk->lock);
  97                         cxgbi_sock_put(csk);
  98                 }
  99         }
 100 }
 101 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 102
 103 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 104 {
 105         log_debug(1 << CXGBI_DBG_DEV,
 106                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 107         cxgbi_hbas_remove(cdev);
 108         cxgbi_device_portmap_cleanup(cdev);
 109         if (cdev->dev_ddp_cleanup)
 110                 cdev->dev_ddp_cleanup(cdev);
 111         else
 112                 cxgbi_ddp_cleanup(cdev);
 113         if (cdev->ddp)
 114                 cxgbi_ddp_cleanup(cdev);
 115         if (cdev->pmap.max_connect)
 116                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 117         kfree(cdev);
 118 }
 119
 120 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 121                                            unsigned int nports)
 122 {
 123         struct cxgbi_device *cdev;
 124
 125         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 126                         (sizeof(struct cxgbi_hba *) +
 127                          sizeof(struct net_device *)),
 128                         GFP_KERNEL);
 129         if (!cdev) {
 130                 pr_warn("nport %d, OOM.\n", nports);
 131                 return NULL;
 132         }
 133         cdev->ports = (struct net_device **)(cdev + 1);
 134         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 135                                                 sizeof(struct net_device *));
 136         if (extra)
 137                 cdev->dd_data = ((char *)cdev->hbas) +
 138                                 nports * sizeof(struct cxgbi_hba *);
 139         spin_lock_init(&cdev->pmap.lock);
 140
 141         mutex_lock(&cdev_mutex);
 142         list_add_tail(&cdev->list_head, &cdev_list);
 143         mutex_unlock(&cdev_mutex);
 144
 145         log_debug(1 << CXGBI_DBG_DEV,
 146                 "cdev 0x%p, p# %u.\n", cdev, nports);
 147         return cdev;
 148 }
 149 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 150
 151 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 152 {
 153         log_debug(1 << CXGBI_DBG_DEV,
 154                 "cdev 0x%p, p# %u,%s.\n",
 155                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 156         mutex_lock(&cdev_mutex);
 157         list_del(&cdev->list_head);
 158         mutex_unlock(&cdev_mutex);
 159         cxgbi_device_destroy(cdev);
 160 }
 161 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 162
 163 void cxgbi_device_unregister_all(unsigned int flag)
 164 {
 165         struct cxgbi_device *cdev, *tmp;
 166
 167         mutex_lock(&cdev_mutex);
 168         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 169                 if ((cdev->flags & flag) == flag) {
 170                         log_debug(1 << CXGBI_DBG_DEV,
 171                                 "cdev 0x%p, p# %u,%s.\n",
 172                                 cdev, cdev->nports, cdev->nports ?
 173                                  cdev->ports[0]->name : "");
 174                         list_del(&cdev->list_head);
 175                         cxgbi_device_destroy(cdev);
 176                 }
 177         }
 178         mutex_unlock(&cdev_mutex);
 179 }
 180 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 181
 182 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 183 {
 184         struct cxgbi_device *cdev, *tmp;
 185
 186         mutex_lock(&cdev_mutex);
 187         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 188                 if (cdev->lldev == lldev) {
 189                         mutex_unlock(&cdev_mutex);
 190                         return cdev;
 191                 }
 192         }
 193         mutex_unlock(&cdev_mutex);
 194         log_debug(1 << CXGBI_DBG_DEV,
 195                 "lldev 0x%p, NO match found.\n", lldev);
 196         return NULL;
 197 }
 198 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 199
 200 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 201                                                  int *port)
 202 {
 203         struct net_device *vdev = NULL;
 204         struct cxgbi_device *cdev, *tmp;
 205         int i;
 206
 207         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 208                 vdev = ndev;
 209                 ndev = vlan_dev_real_dev(ndev);
 210                 log_debug(1 << CXGBI_DBG_DEV,
 211                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 212         }
 213
 214         mutex_lock(&cdev_mutex);
 215         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 216                 for (i = 0; i < cdev->nports; i++) {
 217                         if (ndev == cdev->ports[i]) {
 218                                 cdev->hbas[i]->vdev = vdev;
 219                                 mutex_unlock(&cdev_mutex);
 220                                 if (port)
 221                                         *port = i;
 222                                 return cdev;
 223                         }
 224                 }
 225         }
 226         mutex_unlock(&cdev_mutex);
 227         log_debug(1 << CXGBI_DBG_DEV,
 228                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 229         return NULL;
 230 }
 231 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 232
 233 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 234                                                      int *port)
 235 {
 236         struct net_device *vdev = NULL;
 237         struct cxgbi_device *cdev, *tmp;
 238         int i;
 239
 240         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 241                 vdev = ndev;
 242                 ndev = vlan_dev_real_dev(ndev);
 243                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 244         }
 245
 246         mutex_lock(&cdev_mutex);
 247         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 248                 for (i = 0; i < cdev->nports; i++) {
 249                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 250                                     MAX_ADDR_LEN)) {
 251                                 cdev->hbas[i]->vdev = vdev;
 252                                 mutex_unlock(&cdev_mutex);
 253                                 if (port)
 254                                         *port = i;
 255                                 return cdev;
 256                         }
 257                 }
 258         }
 259         mutex_unlock(&cdev_mutex);
 260         log_debug(1 << CXGBI_DBG_DEV,
 261                   "ndev 0x%p, %s, NO match mac found.\n",
 262                   ndev, ndev->name);
 263         return NULL;
 264 }
 265
 266 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 267 {
 268         int i;
 269         struct cxgbi_hba *chba;
 270
 271         log_debug(1 << CXGBI_DBG_DEV,
 272                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 273
 274         for (i = 0; i < cdev->nports; i++) {
 275                 chba = cdev->hbas[i];
 276                 if (chba) {
 277                         cdev->hbas[i] = NULL;
 278                         iscsi_host_remove(chba->shost);
 279                         pci_dev_put(cdev->pdev);
 280                         iscsi_host_free(chba->shost);
 281                 }
 282         }
 283 }
 284 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 285
 286 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 287                 unsigned int max_id, struct scsi_host_template *sht,
 288                 struct scsi_transport_template *stt)
 289 {
 290         struct cxgbi_hba *chba;
 291         struct Scsi_Host *shost;
 292         int i, err;
 293
 294         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 295
 296         for (i = 0; i < cdev->nports; i++) {
 297                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 298                 if (!shost) {
 299                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 300                                 cdev, i, cdev->ports[i]->name);
 301                         err = -ENOMEM;
 302                         goto err_out;
 303                 }
 304
 305                 shost->transportt = stt;
 306                 shost->max_lun = max_lun;
 307                 shost->max_id = max_id;
 308                 shost->max_channel = 0;
 309                 shost->max_cmd_len = 16;
 310
 311                 chba = iscsi_host_priv(shost);
 312                 chba->cdev = cdev;
 313                 chba->ndev = cdev->ports[i];
 314                 chba->shost = shost;
 315
 316                 log_debug(1 << CXGBI_DBG_DEV,
 317                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 318                         cdev, i, cdev->ports[i]->name, chba);
 319
 320                 pci_dev_get(cdev->pdev);
 321                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 322                 if (err) {
 323                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 324                                 cdev, i, cdev->ports[i]->name);
 325                         pci_dev_put(cdev->pdev);
 326                         scsi_host_put(shost);
 327                         goto  err_out;
 328                 }
 329
 330                 cdev->hbas[i] = chba;
 331         }
 332
 333         return 0;
 334
 335 err_out:
 336         cxgbi_hbas_remove(cdev);
 337         return err;
 338 }
 339 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 340
 341 /*
 342  * iSCSI offload
 343  *
 344  * - source port management
 345  *   To find a free source port in the port allocation map we use a very simple
 346  *   rotor scheme to look for the next free port.
 347  *
 348  *   If a source port has been specified make sure that it doesn't collide with
 349  *   our normal source port allocation map.  If it's outside the range of our
 350  *   allocation/deallocation scheme just let them use it.
 351  *
 352  *   If the source port is outside our allocation range, the caller is
 353  *   responsible for keeping track of their port usage.
 354  */
 355 static int sock_get_port(struct cxgbi_sock *csk)
 356 {
 357         struct cxgbi_device *cdev = csk->cdev;
 358         struct cxgbi_ports_map *pmap = &cdev->pmap;
 359         unsigned int start;
 360         int idx;
 361         __be16 *port;
 362
 363         if (!pmap->max_connect) {
 364                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 365                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 366                 return -EADDRNOTAVAIL;
 367         }
 368
 369         if (csk->csk_family == AF_INET)
 370                 port = &csk->saddr.sin_port;
 371         else /* ipv6 */
 372                 port = &csk->saddr6.sin6_port;
 373
 374         if (*port) {
 375                 pr_err("source port NON-ZERO %u.\n",
 376                         ntohs(*port));
 377                 return -EADDRINUSE;
 378         }
 379
 380         spin_lock_bh(&pmap->lock);
 381         if (pmap->used >= pmap->max_connect) {
 382                 spin_unlock_bh(&pmap->lock);
 383                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 384                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 385                 return -EADDRNOTAVAIL;
 386         }
 387
 388         start = idx = pmap->next;
 389         do {
 390                 if (++idx >= pmap->max_connect)
 391                         idx = 0;
 392                 if (!pmap->port_csk[idx]) {
 393                         pmap->used++;
 394                         *port = htons(pmap->sport_base + idx);
 395                         pmap->next = idx;
 396                         pmap->port_csk[idx] = csk;
 397                         spin_unlock_bh(&pmap->lock);
 398                         cxgbi_sock_get(csk);
 399                         log_debug(1 << CXGBI_DBG_SOCK,
 400                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 401                                 cdev, csk->port_id,
 402                                 cdev->ports[csk->port_id]->name,
 403                                 pmap->sport_base + idx, pmap->next);
 404                         return 0;
 405                 }
 406         } while (idx != start);
 407         spin_unlock_bh(&pmap->lock);
 408
 409         /* should not happen */
 410         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 411                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 412                 pmap->next);
 413         return -EADDRNOTAVAIL;
 414 }
 415
 416 static void sock_put_port(struct cxgbi_sock *csk)
 417 {
 418         struct cxgbi_device *cdev = csk->cdev;
 419         struct cxgbi_ports_map *pmap = &cdev->pmap;
 420         __be16 *port;
 421
 422         if (csk->csk_family == AF_INET)
 423                 port = &csk->saddr.sin_port;
 424         else /* ipv6 */
 425                 port = &csk->saddr6.sin6_port;
 426
 427         if (*port) {
 428                 int idx = ntohs(*port) - pmap->sport_base;
 429
 430                 *port = 0;
 431                 if (idx < 0 || idx >= pmap->max_connect) {
 432                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 433                                 cdev, csk->port_id,
 434                                 cdev->ports[csk->port_id]->name,
 435                                 ntohs(*port));
 436                         return;
 437                 }
 438
 439                 spin_lock_bh(&pmap->lock);
 440                 pmap->port_csk[idx] = NULL;
 441                 pmap->used--;
 442                 spin_unlock_bh(&pmap->lock);
 443
 444                 log_debug(1 << CXGBI_DBG_SOCK,
 445                         "cdev 0x%p, p#%u %s, release %u.\n",
 446                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 447                         pmap->sport_base + idx);
 448
 449                 cxgbi_sock_put(csk);
 450         }
 451 }
 452
 453 /*
 454  * iscsi tcp connection
 455  */
 456 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 457 {
 458         if (csk->cpl_close) {
 459                 kfree_skb(csk->cpl_close);
 460                 csk->cpl_close = NULL;
 461         }
 462         if (csk->cpl_abort_req) {
 463                 kfree_skb(csk->cpl_abort_req);
 464                 csk->cpl_abort_req = NULL;
 465         }
 466         if (csk->cpl_abort_rpl) {
 467                 kfree_skb(csk->cpl_abort_rpl);
 468                 csk->cpl_abort_rpl = NULL;
 469         }
 470 }
 471 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 472
 473 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 474 {
 475         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 476
 477         if (!csk) {
 478                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 479                 return NULL;
 480         }
 481
 482         if (cdev->csk_alloc_cpls(csk) < 0) {
 483                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 484                 kfree(csk);
 485                 return NULL;
 486         }
 487
 488         spin_lock_init(&csk->lock);
 489         kref_init(&csk->refcnt);
 490         skb_queue_head_init(&csk->receive_queue);
 491         skb_queue_head_init(&csk->write_queue);
 492         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 493         rwlock_init(&csk->callback_lock);
 494         csk->cdev = cdev;
 495         csk->flags = 0;
 496         cxgbi_sock_set_state(csk, CTP_CLOSED);
 497
 498         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 499
 500         return csk;
 501 }
 502
 503 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 504                                       __be32 saddr, __be32 daddr,
 505                                       __be16 sport, __be16 dport, u8 tos)
 506 {
 507         struct rtable *rt;
 508
 509         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 510                                    dport, sport, IPPROTO_TCP, tos, 0);
 511         if (IS_ERR(rt))
 512                 return NULL;
 513
 514         return rt;
 515 }
 516
 517 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 518 {
 519         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 520         struct dst_entry *dst;
 521         struct net_device *ndev;
 522         struct cxgbi_device *cdev;
 523         struct rtable *rt = NULL;
 524         struct neighbour *n;
 525         struct flowi4 fl4;
 526         struct cxgbi_sock *csk = NULL;
 527         unsigned int mtu = 0;
 528         int port = 0xFFFF;
 529         int err = 0;
 530
 531         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 532         if (!rt) {
 533                 pr_info("no route to ipv4 0x%x, port %u.\n",
 534                         be32_to_cpu(daddr->sin_addr.s_addr),
 535                         be16_to_cpu(daddr->sin_port));
 536                 err = -ENETUNREACH;
 537                 goto err_out;
 538         }
 539         dst = &rt->dst;
 540         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 541         if (!n) {
 542                 err = -ENODEV;
 543                 goto rel_rt;
 544         }
 545         ndev = n->dev;
 546
 547         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 548                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 549                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 550                         ndev->name);
 551                 err = -ENETUNREACH;
 552                 goto rel_neigh;
 553         }
 554
 555         if (ndev->flags & IFF_LOOPBACK) {
 556                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 557                 mtu = ndev->mtu;
 558                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 559                         n->dev->name, ndev->name, mtu);
 560         }
 561
 562         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 563         if (!cdev) {
 564                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 565                         &daddr->sin_addr.s_addr, ndev->name);
 566                 err = -ENETUNREACH;
 567                 goto rel_neigh;
 568         }
 569         log_debug(1 << CXGBI_DBG_SOCK,
 570                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 571                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 572                            port, ndev->name, cdev);
 573
 574         csk = cxgbi_sock_create(cdev);
 575         if (!csk) {
 576                 err = -ENOMEM;
 577                 goto rel_neigh;
 578         }
 579         csk->cdev = cdev;
 580         csk->port_id = port;
 581         csk->mtu = mtu;
 582         csk->dst = dst;
 583
 584         csk->csk_family = AF_INET;
 585         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 586         csk->daddr.sin_port = daddr->sin_port;
 587         csk->daddr.sin_family = daddr->sin_family;
 588         csk->saddr.sin_family = daddr->sin_family;
 589         csk->saddr.sin_addr.s_addr = fl4.saddr;
 590         neigh_release(n);
 591
 592         return csk;
 593
 594 rel_neigh:
 595         neigh_release(n);
 596
 597 rel_rt:
 598         ip_rt_put(rt);
 599         if (csk)
 600                 cxgbi_sock_closed(csk);
 601 err_out:
 602         return ERR_PTR(err);
 603 }
 604
 605 #if IS_ENABLED(CONFIG_IPV6)
 606 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 607                                         const struct in6_addr *daddr)
 608 {
 609         struct flowi6 fl;
 610
 611         if (saddr)
 612                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 613         if (daddr)
 614                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 615         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 616 }
 617
 618 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 619 {
 620         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 621         struct dst_entry *dst;
 622         struct net_device *ndev;
 623         struct cxgbi_device *cdev;
 624         struct rt6_info *rt = NULL;
 625         struct neighbour *n;
 626         struct in6_addr pref_saddr;
 627         struct cxgbi_sock *csk = NULL;
 628         unsigned int mtu = 0;
 629         int port = 0xFFFF;
 630         int err = 0;
 631
 632         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 633
 634         if (!rt) {
 635                 pr_info("no route to ipv6 %pI6 port %u\n",
 636                         daddr6->sin6_addr.s6_addr,
 637                         be16_to_cpu(daddr6->sin6_port));
 638                 err = -ENETUNREACH;
 639                 goto err_out;
 640         }
 641
 642         dst = &rt->dst;
 643
 644         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 645
 646         if (!n) {
 647                 pr_info("%pI6, port %u, dst no neighbour.\n",
 648                         daddr6->sin6_addr.s6_addr,
 649                         be16_to_cpu(daddr6->sin6_port));
 650                 err = -ENETUNREACH;
 651                 goto rel_rt;
 652         }
 653         ndev = n->dev;
 654
 655         if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
 656                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 657                         daddr6->sin6_addr.s6_addr,
 658                         ntohs(daddr6->sin6_port), ndev->name);
 659                 err = -ENETUNREACH;
 660                 goto rel_rt;
 661         }
 662
 663         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 664         if (!cdev)
 665                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 666         if (!cdev) {
 667                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 668                         daddr6->sin6_addr.s6_addr, ndev->name);
 669                 err = -ENETUNREACH;
 670                 goto rel_rt;
 671         }
 672         log_debug(1 << CXGBI_DBG_SOCK,
 673                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 674                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 675                   ndev->name, cdev);
 676
 677         csk = cxgbi_sock_create(cdev);
 678         if (!csk) {
 679                 err = -ENOMEM;
 680                 goto rel_rt;
 681         }
 682         csk->cdev = cdev;
 683         csk->port_id = port;
 684         csk->mtu = mtu;
 685         csk->dst = dst;
 686
 687         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 688                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 689
 690                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 691                                          &daddr6->sin6_addr, 0, &pref_saddr);
 692                 if (err) {
 693                         pr_info("failed to get source address to reach %pI6\n",
 694                                 &daddr6->sin6_addr);
 695                         goto rel_rt;
 696                 }
 697         } else {
 698                 pref_saddr = rt->rt6i_prefsrc.addr;
 699         }
 700
 701         csk->csk_family = AF_INET6;
 702         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 703         csk->daddr6.sin6_port = daddr6->sin6_port;
 704         csk->daddr6.sin6_family = daddr6->sin6_family;
 705         csk->saddr6.sin6_addr = pref_saddr;
 706
 707         neigh_release(n);
 708         return csk;
 709
 710 rel_rt:
 711         if (n)
 712                 neigh_release(n);
 713
 714         ip6_rt_put(rt);
 715         if (csk)
 716                 cxgbi_sock_closed(csk);
 717 err_out:
 718         return ERR_PTR(err);
 719 }
 720 #endif /* IS_ENABLED(CONFIG_IPV6) */
 721
 722 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 723                         unsigned int opt)
 724 {
 725         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 726         dst_confirm(csk->dst);
 727         smp_mb();
 728         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 729 }
 730 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 731
 732 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 733 {
 734         log_debug(1 << CXGBI_DBG_SOCK,
 735                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 736                 csk, csk->state, csk->flags, csk->user_data);
 737
 738         if (csk->state != CTP_ESTABLISHED) {
 739                 read_lock_bh(&csk->callback_lock);
 740                 if (csk->user_data)
 741                         iscsi_conn_failure(csk->user_data,
 742                                         ISCSI_ERR_CONN_FAILED);
 743                 read_unlock_bh(&csk->callback_lock);
 744         }
 745 }
 746
 747 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 748 {
 749         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 750                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 751         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 752         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 753                 return;
 754         if (csk->saddr.sin_port)
 755                 sock_put_port(csk);
 756         if (csk->dst)
 757                 dst_release(csk->dst);
 758         csk->cdev->csk_release_offload_resources(csk);
 759         cxgbi_sock_set_state(csk, CTP_CLOSED);
 760         cxgbi_inform_iscsi_conn_closing(csk);
 761         cxgbi_sock_put(csk);
 762 }
 763 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 764
 765 static void need_active_close(struct cxgbi_sock *csk)
 766 {
 767         int data_lost;
 768         int close_req = 0;
 769
 770         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 771                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 772         spin_lock_bh(&csk->lock);
 773         dst_confirm(csk->dst);
 774         data_lost = skb_queue_len(&csk->receive_queue);
 775         __skb_queue_purge(&csk->receive_queue);
 776
 777         if (csk->state == CTP_ACTIVE_OPEN)
 778                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 779         else if (csk->state == CTP_ESTABLISHED) {
 780                 close_req = 1;
 781                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 782         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 783                 close_req = 1;
 784                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 785         }
 786
 787         if (close_req) {
 788                 if (data_lost)
 789                         csk->cdev->csk_send_abort_req(csk);
 790                 else
 791                         csk->cdev->csk_send_close_req(csk);
 792         }
 793
 794         spin_unlock_bh(&csk->lock);
 795 }
 796
 797 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 798 {
 799         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 800                         csk, csk->state, csk->flags,
 801                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 802                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 803                         errno);
 804
 805         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 806         csk->err = errno;
 807         cxgbi_sock_closed(csk);
 808 }
 809 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 810
 811 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 812 {
 813         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 814
 815         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 816                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 817         cxgbi_sock_get(csk);
 818         spin_lock_bh(&csk->lock);
 819         if (csk->state == CTP_ACTIVE_OPEN)
 820                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 821         spin_unlock_bh(&csk->lock);
 822         cxgbi_sock_put(csk);
 823         __kfree_skb(skb);
 824 }
 825 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 826
 827 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 828 {
 829         cxgbi_sock_get(csk);
 830         spin_lock_bh(&csk->lock);
 831         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 832                 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
 833                         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 834                 else {
 835                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
 836                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 837                         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 838                                 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 839                                         csk, csk->state, csk->flags, csk->tid);
 840                         cxgbi_sock_closed(csk);
 841                 }
 842         }
 843         spin_unlock_bh(&csk->lock);
 844         cxgbi_sock_put(csk);
 845 }
 846 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 847
 848 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 849 {
 850         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 851                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 852         cxgbi_sock_get(csk);
 853         spin_lock_bh(&csk->lock);
 854
 855         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 856                 goto done;
 857
 858         switch (csk->state) {
 859         case CTP_ESTABLISHED:
 860                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 861                 break;
 862         case CTP_ACTIVE_CLOSE:
 863                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 864                 break;
 865         case CTP_CLOSE_WAIT_1:
 866                 cxgbi_sock_closed(csk);
 867                 break;
 868         case CTP_ABORTING:
 869                 break;
 870         default:
 871                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 872                         csk, csk->state, csk->flags, csk->tid);
 873         }
 874         cxgbi_inform_iscsi_conn_closing(csk);
 875 done:
 876         spin_unlock_bh(&csk->lock);
 877         cxgbi_sock_put(csk);
 878 }
 879 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 880
 881 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 882 {
 883         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 884                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 885         cxgbi_sock_get(csk);
 886         spin_lock_bh(&csk->lock);
 887
 888         csk->snd_una = snd_nxt - 1;
 889         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 890                 goto done;
 891
 892         switch (csk->state) {
 893         case CTP_ACTIVE_CLOSE:
 894                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 895                 break;
 896         case CTP_CLOSE_WAIT_1:
 897         case CTP_CLOSE_WAIT_2:
 898                 cxgbi_sock_closed(csk);
 899                 break;
 900         case CTP_ABORTING:
 901                 break;
 902         default:
 903                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 904                         csk, csk->state, csk->flags, csk->tid);
 905         }
 906 done:
 907         spin_unlock_bh(&csk->lock);
 908         cxgbi_sock_put(csk);
 909 }
 910 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 911
 912 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 913                            unsigned int snd_una, int seq_chk)
 914 {
 915         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 916                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 917                         csk, csk->state, csk->flags, csk->tid, credits,
 918                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 919
 920         spin_lock_bh(&csk->lock);
 921
 922         csk->wr_cred += credits;
 923         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
 924                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
 925
 926         while (credits) {
 927                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
 928
 929                 if (unlikely(!p)) {
 930                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
 931                                 csk, csk->state, csk->flags, csk->tid, credits,
 932                                 csk->wr_cred, csk->wr_una_cred);
 933                         break;
 934                 }
 935
 936                 if (unlikely(credits < p->csum)) {
 937                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
 938                                 csk, csk->state, csk->flags, csk->tid,
 939                                 credits, csk->wr_cred, csk->wr_una_cred,
 940                                 p->csum);
 941                         p->csum -= credits;
 942                         break;
 943                 } else {
 944                         cxgbi_sock_dequeue_wr(csk);
 945                         credits -= p->csum;
 946                         kfree_skb(p);
 947                 }
 948         }
 949
 950         cxgbi_sock_check_wr_invariants(csk);
 951
 952         if (seq_chk) {
 953                 if (unlikely(before(snd_una, csk->snd_una))) {
 954                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
 955                                 csk, csk->state, csk->flags, csk->tid, snd_una,
 956                                 csk->snd_una);
 957                         goto done;
 958                 }
 959
 960                 if (csk->snd_una != snd_una) {
 961                         csk->snd_una = snd_una;
 962                         dst_confirm(csk->dst);
 963                 }
 964         }
 965
 966         if (skb_queue_len(&csk->write_queue)) {
 967                 if (csk->cdev->csk_push_tx_frames(csk, 0))
 968                         cxgbi_conn_tx_open(csk);
 969         } else
 970                 cxgbi_conn_tx_open(csk);
 971 done:
 972         spin_unlock_bh(&csk->lock);
 973 }
 974 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
 975
 976 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
 977                                              unsigned short mtu)
 978 {
 979         int i = 0;
 980
 981         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
 982                 ++i;
 983
 984         return i;
 985 }
 986
 987 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
 988 {
 989         unsigned int idx;
 990         struct dst_entry *dst = csk->dst;
 991
 992         csk->advmss = dst_metric_advmss(dst);
 993
 994         if (csk->advmss > pmtu - 40)
 995                 csk->advmss = pmtu - 40;
 996         if (csk->advmss < csk->cdev->mtus[0] - 40)
 997                 csk->advmss = csk->cdev->mtus[0] - 40;
 998         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
 999
1000         return idx;
1001 }
1002 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1003
1004 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1005 {
1006         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1007         __skb_queue_tail(&csk->write_queue, skb);
1008 }
1009 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1010
1011 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1012 {
1013         struct sk_buff *skb;
1014
1015         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1016                 kfree_skb(skb);
1017 }
1018 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1019
1020 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1021 {
1022         int pending = cxgbi_sock_count_pending_wrs(csk);
1023
1024         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1025                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1026                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1027 }
1028 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1029
1030 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1031 {
1032         struct cxgbi_device *cdev = csk->cdev;
1033         struct sk_buff *next;
1034         int err, copied = 0;
1035
1036         spin_lock_bh(&csk->lock);
1037
1038         if (csk->state != CTP_ESTABLISHED) {
1039                 log_debug(1 << CXGBI_DBG_PDU_TX,
1040                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1041                         csk, csk->state, csk->flags, csk->tid);
1042                 err = -EAGAIN;
1043                 goto out_err;
1044         }
1045
1046         if (csk->err) {
1047                 log_debug(1 << CXGBI_DBG_PDU_TX,
1048                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1049                         csk, csk->state, csk->flags, csk->tid, csk->err);
1050                 err = -EPIPE;
1051                 goto out_err;
1052         }
1053
1054         if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
1055                 log_debug(1 << CXGBI_DBG_PDU_TX,
1056                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1057                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1058                         csk->snd_una, cdev->snd_win);
1059                 err = -ENOBUFS;
1060                 goto out_err;
1061         }
1062
1063         while (skb) {
1064                 int frags = skb_shinfo(skb)->nr_frags +
1065                                 (skb->len != skb->data_len);
1066
1067                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1068                         pr_err("csk 0x%p, skb head %u < %u.\n",
1069                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1070                         err = -EINVAL;
1071                         goto out_err;
1072                 }
1073
1074                 if (frags >= SKB_WR_LIST_SIZE) {
1075                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1076                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1077                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1078                         err = -EINVAL;
1079                         goto out_err;
1080                 }
1081
1082                 next = skb->next;
1083                 skb->next = NULL;
1084                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1085                 cxgbi_sock_skb_entail(csk, skb);
1086                 copied += skb->len;
1087                 csk->write_seq += skb->len +
1088                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1089                 skb = next;
1090         }
1091 done:
1092         if (likely(skb_queue_len(&csk->write_queue)))
1093                 cdev->csk_push_tx_frames(csk, 1);
1094         spin_unlock_bh(&csk->lock);
1095         return copied;
1096
1097 out_err:
1098         if (copied == 0 && err == -EPIPE)
1099                 copied = csk->err ? csk->err : -EPIPE;
1100         else
1101                 copied = err;
1102         goto done;
1103 }
1104
1105 /*
1106  * Direct Data Placement -
1107  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1108  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1109  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1110  * The host memory address is programmed into h/w in the format of pagepod
1111  * entries.
1112  * The location of the pagepod entry is encoded into ddp tag which is used as
1113  * the base for ITT/TTT.
1114  */
1115
1116 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1117 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1118 static unsigned char page_idx = DDP_PGIDX_MAX;
1119
1120 static unsigned char sw_tag_idx_bits;
1121 static unsigned char sw_tag_age_bits;
1122
1123 /*
1124  * Direct-Data Placement page size adjustment
1125  */
1126 static int ddp_adjust_page_table(void)
1127 {
1128         int i;
1129         unsigned int base_order, order;
1130
1131         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1132                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1133                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
1134                 return -EINVAL;
1135         }
1136
1137         base_order = get_order(1UL << ddp_page_shift[0]);
1138         order = get_order(1UL << PAGE_SHIFT);
1139
1140         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1141                 /* first is the kernel page size, then just doubling */
1142                 ddp_page_order[i] = order - base_order + i;
1143                 ddp_page_shift[i] = PAGE_SHIFT + i;
1144         }
1145         return 0;
1146 }
1147
1148 static int ddp_find_page_index(unsigned long pgsz)
1149 {
1150         int i;
1151
1152         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1153                 if (pgsz == (1UL << ddp_page_shift[i]))
1154                         return i;
1155         }
1156         pr_info("ddp page size %lu not supported.\n", pgsz);
1157         return DDP_PGIDX_MAX;
1158 }
1159
1160 static void ddp_setup_host_page_size(void)
1161 {
1162         if (page_idx == DDP_PGIDX_MAX) {
1163                 page_idx = ddp_find_page_index(PAGE_SIZE);
1164
1165                 if (page_idx == DDP_PGIDX_MAX) {
1166                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1167                         if (ddp_adjust_page_table() < 0) {
1168                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1169                                 return;
1170                         }
1171                         page_idx = ddp_find_page_index(PAGE_SIZE);
1172                 }
1173                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1174         }
1175 }
1176
1177 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1178 {
1179         int i;
1180
1181         for (i = 0; i < DDP_PGIDX_MAX; i++)
1182                 pgsz_factor[i] = ddp_page_order[i];
1183 }
1184 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1185
1186 /*
1187  * DDP setup & teardown
1188  */
1189
1190 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1191                         struct cxgbi_pagepod_hdr *hdr,
1192                         struct cxgbi_gather_list *gl, unsigned int gidx)
1193 {
1194         int i;
1195
1196         memcpy(ppod, hdr, sizeof(*hdr));
1197         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1198                 ppod->addr[i] = gidx < gl->nelem ?
1199                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1200         }
1201 }
1202 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1203
1204 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1205 {
1206         memset(ppod, 0, sizeof(*ppod));
1207 }
1208 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1209
1210 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1211                                         unsigned int start, unsigned int max,
1212                                         unsigned int count,
1213                                         struct cxgbi_gather_list *gl)
1214 {
1215         unsigned int i, j, k;
1216
1217         /*  not enough entries */
1218         if ((max - start) < count) {
1219                 log_debug(1 << CXGBI_DBG_DDP,
1220                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1221                 return -EBUSY;
1222         }
1223
1224         max -= count;
1225         spin_lock(&ddp->map_lock);
1226         for (i = start; i < max;) {
1227                 for (j = 0, k = i; j < count; j++, k++) {
1228                         if (ddp->gl_map[k])
1229                                 break;
1230                 }
1231                 if (j == count) {
1232                         for (j = 0, k = i; j < count; j++, k++)
1233                                 ddp->gl_map[k] = gl;
1234                         spin_unlock(&ddp->map_lock);
1235                         return i;
1236                 }
1237                 i += j + 1;
1238         }
1239         spin_unlock(&ddp->map_lock);
1240         log_debug(1 << CXGBI_DBG_DDP,
1241                 "NO suitable entries %u available.\n", count);
1242         return -EBUSY;
1243 }
1244
1245 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1246                                                 int start, int count)
1247 {
1248         spin_lock(&ddp->map_lock);
1249         memset(&ddp->gl_map[start], 0,
1250                 count * sizeof(struct cxgbi_gather_list *));
1251         spin_unlock(&ddp->map_lock);
1252 }
1253
1254 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1255                                         struct cxgbi_gather_list *gl)
1256 {
1257         int i;
1258
1259         for (i = 0; i < gl->nelem; i++)
1260                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1261                                 PCI_DMA_FROMDEVICE);
1262 }
1263
1264 static inline int ddp_gl_map(struct pci_dev *pdev,
1265                                     struct cxgbi_gather_list *gl)
1266 {
1267         int i;
1268
1269         for (i = 0; i < gl->nelem; i++) {
1270                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1271                                                 PAGE_SIZE,
1272                                                 PCI_DMA_FROMDEVICE);
1273                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1274                         log_debug(1 << CXGBI_DBG_DDP,
1275                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1276                                 i, gl->pages[i], pdev);
1277                         goto unmap;
1278                 }
1279         }
1280         return i;
1281 unmap:
1282         if (i) {
1283                 unsigned int nelem = gl->nelem;
1284
1285                 gl->nelem = i;
1286                 ddp_gl_unmap(pdev, gl);
1287                 gl->nelem = nelem;
1288         }
1289         return -EINVAL;
1290 }
1291
1292 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1293                                   struct pci_dev *pdev)
1294 {
1295         ddp_gl_unmap(pdev, gl);
1296         kfree(gl);
1297 }
1298
1299 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1300                                                     struct scatterlist *sgl,
1301                                                     unsigned int sgcnt,
1302                                                     struct pci_dev *pdev,
1303                                                     gfp_t gfp)
1304 {
1305         struct cxgbi_gather_list *gl;
1306         struct scatterlist *sg = sgl;
1307         struct page *sgpage = sg_page(sg);
1308         unsigned int sglen = sg->length;
1309         unsigned int sgoffset = sg->offset;
1310         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1311                                 PAGE_SHIFT;
1312         int i = 1, j = 0;
1313
1314         if (xferlen < DDP_THRESHOLD) {
1315                 log_debug(1 << CXGBI_DBG_DDP,
1316                         "xfer %u < threshold %u, no ddp.\n",
1317                         xferlen, DDP_THRESHOLD);
1318                 return NULL;
1319         }
1320
1321         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1322                      npages * (sizeof(dma_addr_t) +
1323                      sizeof(struct page *)), gfp);
1324         if (!gl) {
1325                 log_debug(1 << CXGBI_DBG_DDP,
1326                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1327                 return NULL;
1328         }
1329
1330          log_debug(1 << CXGBI_DBG_DDP,
1331                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1332
1333         gl->pages = (struct page **)&gl->phys_addr[npages];
1334         gl->nelem = npages;
1335         gl->length = xferlen;
1336         gl->offset = sgoffset;
1337         gl->pages[0] = sgpage;
1338
1339         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1340                 i++, sg = sg_next(sg)) {
1341                 struct page *page = sg_page(sg);
1342
1343                 if (sgpage == page && sg->offset == sgoffset + sglen)
1344                         sglen += sg->length;
1345                 else {
1346                         /*  make sure the sgl is fit for ddp:
1347                          *  each has the same page size, and
1348                          *  all of the middle pages are used completely
1349                          */
1350                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1351                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1352                                 log_debug(1 << CXGBI_DBG_DDP,
1353                                         "page %d/%u, %u + %u.\n",
1354                                         i, sgcnt, sgoffset, sglen);
1355                                 goto error_out;
1356                         }
1357
1358                         j++;
1359                         if (j == gl->nelem || sg->offset) {
1360                                 log_debug(1 << CXGBI_DBG_DDP,
1361                                         "page %d/%u, offset %u.\n",
1362                                         j, gl->nelem, sg->offset);
1363                                 goto error_out;
1364                         }
1365                         gl->pages[j] = page;
1366                         sglen = sg->length;
1367                         sgoffset = sg->offset;
1368                         sgpage = page;
1369                 }
1370         }
1371         gl->nelem = ++j;
1372
1373         if (ddp_gl_map(pdev, gl) < 0)
1374                 goto error_out;
1375
1376         return gl;
1377
1378 error_out:
1379         kfree(gl);
1380         return NULL;
1381 }
1382
1383 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1384 {
1385         struct cxgbi_device *cdev = chba->cdev;
1386         struct cxgbi_ddp_info *ddp = cdev->ddp;
1387         u32 idx;
1388
1389         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1390         if (idx < ddp->nppods) {
1391                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1392                 unsigned int npods;
1393
1394                 if (!gl || !gl->nelem) {
1395                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1396                                 tag, idx, gl, gl ? gl->nelem : 0);
1397                         return;
1398                 }
1399                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1400                 log_debug(1 << CXGBI_DBG_DDP,
1401                         "tag 0x%x, release idx %u, npods %u.\n",
1402                         tag, idx, npods);
1403                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1404                 ddp_unmark_entries(ddp, idx, npods);
1405                 ddp_release_gl(gl, ddp->pdev);
1406         } else
1407                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1408 }
1409
1410 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1411                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1412                            gfp_t gfp)
1413 {
1414         struct cxgbi_device *cdev = csk->cdev;
1415         struct cxgbi_ddp_info *ddp = cdev->ddp;
1416         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1417         struct cxgbi_pagepod_hdr hdr;
1418         unsigned int npods;
1419         int idx = -1;
1420         int err = -ENOMEM;
1421         u32 tag;
1422
1423         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1424         if (ddp->idx_last == ddp->nppods)
1425                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1426                                                         npods, gl);
1427         else {
1428                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1429                                                         ddp->nppods, npods,
1430                                                         gl);
1431                 if (idx < 0 && ddp->idx_last >= npods) {
1432                         idx = ddp_find_unused_entries(ddp, 0,
1433                                 min(ddp->idx_last + npods, ddp->nppods),
1434                                                         npods, gl);
1435                 }
1436         }
1437         if (idx < 0) {
1438                 log_debug(1 << CXGBI_DBG_DDP,
1439                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1440                         gl->length, gl->nelem, npods);
1441                 return idx;
1442         }
1443
1444         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1445         tag |= idx << PPOD_IDX_SHIFT;
1446
1447         hdr.rsvd = 0;
1448         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1449         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1450         hdr.max_offset = htonl(gl->length);
1451         hdr.page_offset = htonl(gl->offset);
1452
1453         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1454         if (err < 0)
1455                 goto unmark_entries;
1456
1457         ddp->idx_last = idx;
1458         log_debug(1 << CXGBI_DBG_DDP,
1459                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1460                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1461                 npods);
1462         *tagp = tag;
1463         return 0;
1464
1465 unmark_entries:
1466         ddp_unmark_entries(ddp, idx, npods);
1467         return err;
1468 }
1469
1470 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1471                         unsigned int sw_tag, unsigned int xferlen,
1472                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1473 {
1474         struct cxgbi_device *cdev = csk->cdev;
1475         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1476         struct cxgbi_gather_list *gl;
1477         int err;
1478
1479         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1480             xferlen < DDP_THRESHOLD) {
1481                 log_debug(1 << CXGBI_DBG_DDP,
1482                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1483                 return -EINVAL;
1484         }
1485
1486         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1487                 log_debug(1 << CXGBI_DBG_DDP,
1488                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1489                 return -EINVAL;
1490         }
1491
1492         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1493         if (!gl)
1494                 return -ENOMEM;
1495
1496         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1497         if (err < 0)
1498                 ddp_release_gl(gl, cdev->pdev);
1499
1500         return err;
1501 }
1502
1503 static void ddp_destroy(struct kref *kref)
1504 {
1505         struct cxgbi_ddp_info *ddp = container_of(kref,
1506                                                 struct cxgbi_ddp_info,
1507                                                 refcnt);
1508         struct cxgbi_device *cdev = ddp->cdev;
1509         int i = 0;
1510
1511         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1512
1513         while (i < ddp->nppods) {
1514                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1515
1516                 if (gl) {
1517                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1518                                         >> PPOD_PAGES_SHIFT;
1519                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1520                         kfree(gl);
1521                         i += npods;
1522                 } else
1523                         i++;
1524         }
1525         cxgbi_free_big_mem(ddp);
1526 }
1527
1528 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1529 {
1530         struct cxgbi_ddp_info *ddp = cdev->ddp;
1531
1532         log_debug(1 << CXGBI_DBG_DDP,
1533                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1534         cdev->ddp = NULL;
1535         if (ddp)
1536                 return kref_put(&ddp->refcnt, ddp_destroy);
1537         return 0;
1538 }
1539 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1540
1541 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1542                    unsigned int llimit, unsigned int ulimit,
1543                    unsigned int max_txsz, unsigned int max_rxsz)
1544 {
1545         struct cxgbi_ddp_info *ddp;
1546         unsigned int ppmax, bits;
1547
1548         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1549         bits = __ilog2_u32(ppmax) + 1;
1550         if (bits > PPOD_IDX_MAX_SIZE)
1551                 bits = PPOD_IDX_MAX_SIZE;
1552         ppmax = (1 << (bits - 1)) - 1;
1553
1554         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1555                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1556                                          sizeof(struct sk_buff *)),
1557                                 GFP_KERNEL);
1558         if (!ddp) {
1559                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1560                 return -ENOMEM;
1561         }
1562         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1563         cdev->ddp = ddp;
1564
1565         spin_lock_init(&ddp->map_lock);
1566         kref_init(&ddp->refcnt);
1567
1568         ddp->cdev = cdev;
1569         ddp->pdev = cdev->pdev;
1570         ddp->llimit = llimit;
1571         ddp->ulimit = ulimit;
1572         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1573         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1574         ddp->nppods = ppmax;
1575         ddp->idx_last = ppmax;
1576         ddp->idx_bits = bits;
1577         ddp->idx_mask = (1 << bits) - 1;
1578         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1579
1580         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1581         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1582         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1583         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1584
1585         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1586                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1587                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1588                 cdev->tag_format.rsvd_mask);
1589
1590         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1591                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1592         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1593                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1594
1595         log_debug(1 << CXGBI_DBG_DDP,
1596                 "%s max payload size: %u/%u, %u/%u.\n",
1597                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1598                 cdev->rx_max_size, ddp->max_rxsz);
1599         return 0;
1600 }
1601 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1602
1603 /*
1604  * APIs interacting with open-iscsi libraries
1605  */
1606
1607 static unsigned char padding[4];
1608
1609 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1610 {
1611         struct scsi_cmnd *sc = task->sc;
1612         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1613         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1614         struct cxgbi_hba *chba = cconn->chba;
1615         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1616         u32 tag = ntohl((__force u32)hdr_itt);
1617
1618         log_debug(1 << CXGBI_DBG_DDP,
1619                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1620         if (sc &&
1621             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1622             cxgbi_is_ddp_tag(tformat, tag))
1623                 ddp_tag_release(chba, tag);
1624 }
1625
1626 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1627 {
1628         struct scsi_cmnd *sc = task->sc;
1629         struct iscsi_conn *conn = task->conn;
1630         struct iscsi_session *sess = conn->session;
1631         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1632         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1633         struct cxgbi_hba *chba = cconn->chba;
1634         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1635         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1636         u32 tag = 0;
1637         int err = -EINVAL;
1638
1639         if (sc &&
1640             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1641                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1642                                         scsi_in(sc)->length,
1643                                         scsi_in(sc)->table.sgl,
1644                                         scsi_in(sc)->table.nents,
1645                                         GFP_ATOMIC);
1646                 if (err < 0)
1647                         log_debug(1 << CXGBI_DBG_DDP,
1648                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1649                                 cconn->cep->csk, task, scsi_in(sc)->length,
1650                                 scsi_in(sc)->table.nents);
1651         }
1652
1653         if (err < 0)
1654                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1655         /*  the itt need to sent in big-endian order */
1656         *hdr_itt = (__force itt_t)htonl(tag);
1657
1658         log_debug(1 << CXGBI_DBG_DDP,
1659                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1660                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1661         return 0;
1662 }
1663
1664 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1665 {
1666         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1667         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1668         struct cxgbi_device *cdev = cconn->chba->cdev;
1669         u32 tag = ntohl((__force u32) itt);
1670         u32 sw_bits;
1671
1672         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1673         if (idx)
1674                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1675         if (age)
1676                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1677
1678         log_debug(1 << CXGBI_DBG_DDP,
1679                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1680                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1681                 age ? *age : 0xFF);
1682 }
1683 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1684
1685 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1686 {
1687         struct iscsi_conn *conn = csk->user_data;
1688
1689         if (conn) {
1690                 log_debug(1 << CXGBI_DBG_SOCK,
1691                         "csk 0x%p, cid %d.\n", csk, conn->id);
1692                 iscsi_conn_queue_work(conn);
1693         }
1694 }
1695 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1696
1697 /*
1698  * pdu receive, interact with libiscsi_tcp
1699  */
1700 static inline int read_pdu_skb(struct iscsi_conn *conn,
1701                                struct sk_buff *skb,
1702                                unsigned int offset,
1703                                int offloaded)
1704 {
1705         int status = 0;
1706         int bytes_read;
1707
1708         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1709         switch (status) {
1710         case ISCSI_TCP_CONN_ERR:
1711                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1712                           skb, offset, offloaded);
1713                 return -EIO;
1714         case ISCSI_TCP_SUSPENDED:
1715                 log_debug(1 << CXGBI_DBG_PDU_RX,
1716                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1717                         skb, offset, offloaded, bytes_read);
1718                 /* no transfer - just have caller flush queue */
1719                 return bytes_read;
1720         case ISCSI_TCP_SKB_DONE:
1721                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1722                         skb, offset, offloaded);
1723                 /*
1724                  * pdus should always fit in the skb and we should get
1725                  * segment done notifcation.
1726                  */
1727                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1728                 return -EFAULT;
1729         case ISCSI_TCP_SEGMENT_DONE:
1730                 log_debug(1 << CXGBI_DBG_PDU_RX,
1731                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1732                         skb, offset, offloaded, bytes_read);
1733                 return bytes_read;
1734         default:
1735                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1736                         skb, offset, offloaded, status);
1737                 return -EINVAL;
1738         }
1739 }
1740
1741 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1742 {
1743         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1744
1745         log_debug(1 << CXGBI_DBG_PDU_RX,
1746                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1747                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1748
1749         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1750                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1751                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1752                 return -EIO;
1753         }
1754
1755         if (conn->hdrdgst_en &&
1756             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1757                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1758                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1759                 return -EIO;
1760         }
1761
1762         return read_pdu_skb(conn, skb, 0, 0);
1763 }
1764
1765 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1766                              struct sk_buff *skb, unsigned int offset)
1767 {
1768         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1769         bool offloaded = 0;
1770         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1771
1772         log_debug(1 << CXGBI_DBG_PDU_RX,
1773                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1774                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1775
1776         if (conn->datadgst_en &&
1777             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1778                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1779                         conn, lskb, cxgbi_skcb_flags(lskb));
1780                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1781                 return -EIO;
1782         }
1783
1784         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1785                 return 0;
1786
1787         /* coalesced, add header digest length */
1788         if (lskb == skb && conn->hdrdgst_en)
1789                 offset += ISCSI_DIGEST_SIZE;
1790
1791         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1792                 offloaded = 1;
1793
1794         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1795                 log_debug(1 << CXGBI_DBG_PDU_RX,
1796                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1797                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1798                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1799
1800         return read_pdu_skb(conn, skb, offset, offloaded);
1801 }
1802
1803 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1804 {
1805         struct cxgbi_device *cdev = csk->cdev;
1806         int must_send;
1807         u32 credits;
1808
1809         log_debug(1 << CXGBI_DBG_PDU_RX,
1810                 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1811                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1812                 csk->rcv_wup, cdev->rx_credit_thres,
1813                 cdev->rcv_win);
1814
1815         if (csk->state != CTP_ESTABLISHED)
1816                 return;
1817
1818         credits = csk->copied_seq - csk->rcv_wup;
1819         if (unlikely(!credits))
1820                 return;
1821         if (unlikely(cdev->rx_credit_thres == 0))
1822                 return;
1823
1824         must_send = credits + 16384 >= cdev->rcv_win;
1825         if (must_send || credits >= cdev->rx_credit_thres)
1826                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1827 }
1828
1829 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1830 {
1831         struct cxgbi_device *cdev = csk->cdev;
1832         struct iscsi_conn *conn = csk->user_data;
1833         struct sk_buff *skb;
1834         unsigned int read = 0;
1835         int err = 0;
1836
1837         log_debug(1 << CXGBI_DBG_PDU_RX,
1838                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1839
1840         if (unlikely(!conn || conn->suspend_rx)) {
1841                 log_debug(1 << CXGBI_DBG_PDU_RX,
1842                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1843                         csk, conn, conn ? conn->id : 0xFF,
1844                         conn ? conn->suspend_rx : 0xFF);
1845                 return;
1846         }
1847
1848         while (!err) {
1849                 skb = skb_peek(&csk->receive_queue);
1850                 if (!skb ||
1851                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1852                         if (skb)
1853                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1854                                         "skb 0x%p, NOT ready 0x%lx.\n",
1855                                         skb, cxgbi_skcb_flags(skb));
1856                         break;
1857                 }
1858                 __skb_unlink(skb, &csk->receive_queue);
1859
1860                 read += cxgbi_skcb_rx_pdulen(skb);
1861                 log_debug(1 << CXGBI_DBG_PDU_RX,
1862                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1863                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1864                         cxgbi_skcb_rx_pdulen(skb));
1865
1866                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1867                         err = skb_read_pdu_bhs(conn, skb);
1868                         if (err < 0) {
1869                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1870                                         "f 0x%lx, plen %u.\n",
1871                                         csk, skb, skb->len,
1872                                         cxgbi_skcb_flags(skb),
1873                                         cxgbi_skcb_rx_pdulen(skb));
1874                                 goto skb_done;
1875                         }
1876                         err = skb_read_pdu_data(conn, skb, skb,
1877                                                 err + cdev->skb_rx_extra);
1878                         if (err < 0)
1879                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1880                                         "f 0x%lx, plen %u.\n",
1881                                         csk, skb, skb->len,
1882                                         cxgbi_skcb_flags(skb),
1883                                         cxgbi_skcb_rx_pdulen(skb));
1884                 } else {
1885                         err = skb_read_pdu_bhs(conn, skb);
1886                         if (err < 0) {
1887                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1888                                         "f 0x%lx, plen %u.\n",
1889                                         csk, skb, skb->len,
1890                                         cxgbi_skcb_flags(skb),
1891                                         cxgbi_skcb_rx_pdulen(skb));
1892                                 goto skb_done;
1893                         }
1894
1895                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1896                                 struct sk_buff *dskb;
1897
1898                                 dskb = skb_peek(&csk->receive_queue);
1899                                 if (!dskb) {
1900                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1901                                                 " plen %u, NO data.\n",
1902                                                 csk, skb, skb->len,
1903                                                 cxgbi_skcb_flags(skb),
1904                                                 cxgbi_skcb_rx_pdulen(skb));
1905                                         err = -EIO;
1906                                         goto skb_done;
1907                                 }
1908                                 __skb_unlink(dskb, &csk->receive_queue);
1909
1910                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1911                                 if (err < 0)
1912                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1913                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1914                                                 "%u.\n",
1915                                                 csk, skb, skb->len,
1916                                                 cxgbi_skcb_flags(skb),
1917                                                 cxgbi_skcb_rx_pdulen(skb),
1918                                                 dskb, dskb->len);
1919                                 __kfree_skb(dskb);
1920                         } else
1921                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1922                 }
1923 skb_done:
1924                 __kfree_skb(skb);
1925
1926                 if (err < 0)
1927                         break;
1928         }
1929
1930         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1931         if (read) {
1932                 csk->copied_seq += read;
1933                 csk_return_rx_credits(csk, read);
1934                 conn->rxdata_octets += read;
1935         }
1936
1937         if (err < 0) {
1938                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1939                         csk, conn, err, read);
1940                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1941         }
1942 }
1943 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1944
1945 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1946                                 unsigned int offset, unsigned int *off,
1947                                 struct scatterlist **sgp)
1948 {
1949         int i;
1950         struct scatterlist *sg;
1951
1952         for_each_sg(sgl, sg, sgcnt, i) {
1953                 if (offset < sg->length) {
1954                         *off = offset;
1955                         *sgp = sg;
1956                         return 0;
1957                 }
1958                 offset -= sg->length;
1959         }
1960         return -EFAULT;
1961 }
1962
1963 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1964                                 unsigned int dlen, struct page_frag *frags,
1965                                 int frag_max)
1966 {
1967         unsigned int datalen = dlen;
1968         unsigned int sglen = sg->length - sgoffset;
1969         struct page *page = sg_page(sg);
1970         int i;
1971
1972         i = 0;
1973         do {
1974                 unsigned int copy;
1975
1976                 if (!sglen) {
1977                         sg = sg_next(sg);
1978                         if (!sg) {
1979                                 pr_warn("sg %d NULL, len %u/%u.\n",
1980                                         i, datalen, dlen);
1981                                 return -EINVAL;
1982                         }
1983                         sgoffset = 0;
1984                         sglen = sg->length;
1985                         page = sg_page(sg);
1986
1987                 }
1988                 copy = min(datalen, sglen);
1989                 if (i && page == frags[i - 1].page &&
1990                     sgoffset + sg->offset ==
1991                         frags[i - 1].offset + frags[i - 1].size) {
1992                         frags[i - 1].size += copy;
1993                 } else {
1994                         if (i >= frag_max) {
1995                                 pr_warn("too many pages %u, dlen %u.\n",
1996                                         frag_max, dlen);
1997                                 return -EINVAL;
1998                         }
1999
2000                         frags[i].page = page;
2001                         frags[i].offset = sg->offset + sgoffset;
2002                         frags[i].size = copy;
2003                         i++;
2004                 }
2005                 datalen -= copy;
2006                 sgoffset += copy;
2007                 sglen -= copy;
2008         } while (datalen);
2009
2010         return i;
2011 }
2012
2013 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2014 {
2015         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2016         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2017         struct cxgbi_device *cdev = cconn->chba->cdev;
2018         struct iscsi_conn *conn = task->conn;
2019         struct iscsi_tcp_task *tcp_task = task->dd_data;
2020         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2021         struct scsi_cmnd *sc = task->sc;
2022         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2023
2024         tcp_task->dd_data = tdata;
2025         task->hdr = NULL;
2026
2027         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2028             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2029              (opcode == ISCSI_OP_SCSI_CMD &&
2030               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2031                 /* data could goes into skb head */
2032                 headroom += min_t(unsigned int,
2033                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2034                                 conn->max_xmit_dlength);
2035
2036         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2037         if (!tdata->skb) {
2038                 struct cxgbi_sock *csk = cconn->cep->csk;
2039                 struct net_device *ndev = cdev->ports[csk->port_id];
2040                 ndev->stats.tx_dropped++;
2041                 return -ENOMEM;
2042         }
2043
2044         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2045         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2046         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2047
2048         /* data_out uses scsi_cmd's itt */
2049         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2050                 task_reserve_itt(task, &task->hdr->itt);
2051
2052         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2053                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2054                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2055                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2056
2057         return 0;
2058 }
2059 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2060
2061 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2062 {
2063         if (hcrc || dcrc) {
2064                 u8 submode = 0;
2065
2066                 if (hcrc)
2067                         submode |= 1;
2068                 if (dcrc)
2069                         submode |= 2;
2070                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2071         } else
2072                 cxgbi_skcb_ulp_mode(skb) = 0;
2073 }
2074
2075 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2076                               unsigned int count)
2077 {
2078         struct iscsi_conn *conn = task->conn;
2079         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2080         struct sk_buff *skb = tdata->skb;
2081         unsigned int datalen = count;
2082         int i, padlen = iscsi_padding(count);
2083         struct page *pg;
2084
2085         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2086                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2087                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2088                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2089
2090         skb_put(skb, task->hdr_len);
2091         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2092         if (!count)
2093                 return 0;
2094
2095         if (task->sc) {
2096                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2097                 struct scatterlist *sg = NULL;
2098                 int err;
2099
2100                 tdata->offset = offset;
2101                 tdata->count = count;
2102                 err = sgl_seek_offset(
2103                                         sdb->table.sgl, sdb->table.nents,
2104                                         tdata->offset, &tdata->sgoffset, &sg);
2105                 if (err < 0) {
2106                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2107                                 sdb->table.nents, tdata->offset, sdb->length);
2108                         return err;
2109                 }
2110                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2111                                         tdata->frags, MAX_PDU_FRAGS);
2112                 if (err < 0) {
2113                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2114                                 sdb->table.nents, tdata->offset, tdata->count);
2115                         return err;
2116                 }
2117                 tdata->nr_frags = err;
2118
2119                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2120                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2121                         char *dst = skb->data + task->hdr_len;
2122                         struct page_frag *frag = tdata->frags;
2123
2124                         /* data fits in the skb's headroom */
2125                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2126                                 char *src = kmap_atomic(frag->page);
2127
2128                                 memcpy(dst, src+frag->offset, frag->size);
2129                                 dst += frag->size;
2130                                 kunmap_atomic(src);
2131                         }
2132                         if (padlen) {
2133                                 memset(dst, 0, padlen);
2134                                 padlen = 0;
2135                         }
2136                         skb_put(skb, count + padlen);
2137                 } else {
2138                         /* data fit into frag_list */
2139                         for (i = 0; i < tdata->nr_frags; i++) {
2140                                 __skb_fill_page_desc(skb, i,
2141                                                 tdata->frags[i].page,
2142                                                 tdata->frags[i].offset,
2143                                                 tdata->frags[i].size);
2144                                 skb_frag_ref(skb, i);
2145                         }
2146                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2147                         skb->len += count;
2148                         skb->data_len += count;
2149                         skb->truesize += count;
2150                 }
2151
2152         } else {
2153                 pg = virt_to_page(task->data);
2154
2155                 get_page(pg);
2156                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2157                                         count);
2158                 skb->len += count;
2159                 skb->data_len += count;
2160                 skb->truesize += count;
2161         }
2162
2163         if (padlen) {
2164                 i = skb_shinfo(skb)->nr_frags;
2165                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2166                                 virt_to_page(padding), offset_in_page(padding),
2167                                 padlen);
2168
2169                 skb->data_len += padlen;
2170                 skb->truesize += padlen;
2171                 skb->len += padlen;
2172         }
2173
2174         return 0;
2175 }
2176 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2177
2178 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2179 {
2180         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2181         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2182         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2183         struct sk_buff *skb = tdata->skb;
2184         unsigned int datalen;
2185         int err;
2186
2187         if (!skb) {
2188                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2189                         "task 0x%p, skb NULL.\n", task);
2190                 return 0;
2191         }
2192
2193         datalen = skb->data_len;
2194         tdata->skb = NULL;
2195         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2196         if (err > 0) {
2197                 int pdulen = err;
2198
2199                 log_debug(1 << CXGBI_DBG_PDU_TX,
2200                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2201                         task, task->sc, skb, skb->len, skb->data_len, err);
2202
2203                 if (task->conn->hdrdgst_en)
2204                         pdulen += ISCSI_DIGEST_SIZE;
2205
2206                 if (datalen && task->conn->datadgst_en)
2207                         pdulen += ISCSI_DIGEST_SIZE;
2208
2209                 task->conn->txdata_octets += pdulen;
2210                 return 0;
2211         }
2212
2213         if (err == -EAGAIN || err == -ENOBUFS) {
2214                 log_debug(1 << CXGBI_DBG_PDU_TX,
2215                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2216                         task, skb, skb->len, skb->data_len, err);
2217                 /* reset skb to send when we are called again */
2218                 tdata->skb = skb;
2219                 return err;
2220         }
2221
2222         kfree_skb(skb);
2223         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2224                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2225                 task->itt, skb, skb->len, skb->data_len, err);
2226         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2227         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2228         return err;
2229 }
2230 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2231
2232 void cxgbi_cleanup_task(struct iscsi_task *task)
2233 {
2234         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2235
2236         log_debug(1 << CXGBI_DBG_ISCSI,
2237                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2238                 task, tdata->skb, task->hdr_itt);
2239
2240         /*  never reached the xmit task callout */
2241         if (tdata->skb)
2242                 __kfree_skb(tdata->skb);
2243         memset(tdata, 0, sizeof(*tdata));
2244
2245         task_release_itt(task, task->hdr_itt);
2246         iscsi_tcp_cleanup_task(task);
2247 }
2248 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2249
2250 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2251                                 struct iscsi_stats *stats)
2252 {
2253         struct iscsi_conn *conn = cls_conn->dd_data;
2254
2255         stats->txdata_octets = conn->txdata_octets;
2256         stats->rxdata_octets = conn->rxdata_octets;
2257         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2258         stats->dataout_pdus = conn->dataout_pdus_cnt;
2259         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2260         stats->datain_pdus = conn->datain_pdus_cnt;
2261         stats->r2t_pdus = conn->r2t_pdus_cnt;
2262         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2263         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2264         stats->digest_err = 0;
2265         stats->timeout_err = 0;
2266         stats->custom_length = 1;
2267         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2268         stats->custom[0].value = conn->eh_abort_cnt;
2269 }
2270 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2271
2272 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2273 {
2274         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2275         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2276         struct cxgbi_device *cdev = cconn->chba->cdev;
2277         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2278         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2279         unsigned int max = max(max_def, headroom);
2280
2281         max = min(cconn->chba->cdev->tx_max_size, max);
2282         if (conn->max_xmit_dlength)
2283                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2284         else
2285                 conn->max_xmit_dlength = max;
2286         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2287
2288         return 0;
2289 }
2290
2291 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2292 {
2293         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2294         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2295         unsigned int max = cconn->chba->cdev->rx_max_size;
2296
2297         cxgbi_align_pdu_size(max);
2298
2299         if (conn->max_recv_dlength) {
2300                 if (conn->max_recv_dlength > max) {
2301                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2302                                 conn->max_recv_dlength, max);
2303                         return -EINVAL;
2304                 }
2305                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2306                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2307         } else
2308                 conn->max_recv_dlength = max;
2309
2310         return 0;
2311 }
2312
2313 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2314                         enum iscsi_param param, char *buf, int buflen)
2315 {
2316         struct iscsi_conn *conn = cls_conn->dd_data;
2317         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2318         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2319         struct cxgbi_sock *csk = cconn->cep->csk;
2320         int err;
2321
2322         log_debug(1 << CXGBI_DBG_ISCSI,
2323                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2324                 cls_conn, param, buflen, buf);
2325
2326         switch (param) {
2327         case ISCSI_PARAM_HDRDGST_EN:
2328                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2329                 if (!err && conn->hdrdgst_en)
2330                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2331                                                         conn->hdrdgst_en,
2332                                                         conn->datadgst_en, 0);
2333                 break;
2334         case ISCSI_PARAM_DATADGST_EN:
2335                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2336                 if (!err && conn->datadgst_en)
2337                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2338                                                         conn->hdrdgst_en,
2339                                                         conn->datadgst_en, 0);
2340                 break;
2341         case ISCSI_PARAM_MAX_R2T:
2342                 return iscsi_tcp_set_max_r2t(conn, buf);
2343         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2344                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2345                 if (!err)
2346                         err = cxgbi_conn_max_recv_dlength(conn);
2347                 break;
2348         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2349                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2350                 if (!err)
2351                         err = cxgbi_conn_max_xmit_dlength(conn);
2352                 break;
2353         default:
2354                 return iscsi_set_param(cls_conn, param, buf, buflen);
2355         }
2356         return err;
2357 }
2358 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2359
2360 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2361 {
2362         int len;
2363
2364         cxgbi_sock_get(csk);
2365         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2366         cxgbi_sock_put(csk);
2367
2368         return len;
2369 }
2370
2371 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2372 {
2373         int len;
2374
2375         cxgbi_sock_get(csk);
2376         if (csk->csk_family == AF_INET)
2377                 len = sprintf(buf, "%pI4",
2378                               &csk->daddr.sin_addr.s_addr);
2379         else
2380                 len = sprintf(buf, "%pI6",
2381                               &csk->daddr6.sin6_addr);
2382
2383         cxgbi_sock_put(csk);
2384
2385         return len;
2386 }
2387
2388 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2389                        char *buf)
2390 {
2391         struct cxgbi_endpoint *cep = ep->dd_data;
2392         struct cxgbi_sock *csk;
2393         int len;
2394
2395         log_debug(1 << CXGBI_DBG_ISCSI,
2396                 "cls_conn 0x%p, param %d.\n", ep, param);
2397
2398         switch (param) {
2399         case ISCSI_PARAM_CONN_PORT:
2400         case ISCSI_PARAM_CONN_ADDRESS:
2401                 if (!cep)
2402                         return -ENOTCONN;
2403
2404                 csk = cep->csk;
2405                 if (!csk)
2406                         return -ENOTCONN;
2407
2408                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2409                                                  &csk->daddr, param, buf);
2410         default:
2411                 return -ENOSYS;
2412         }
2413         return len;
2414 }
2415 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2416
2417 struct iscsi_cls_conn *
2418 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2419 {
2420         struct iscsi_cls_conn *cls_conn;
2421         struct iscsi_conn *conn;
2422         struct iscsi_tcp_conn *tcp_conn;
2423         struct cxgbi_conn *cconn;
2424
2425         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2426         if (!cls_conn)
2427                 return NULL;
2428
2429         conn = cls_conn->dd_data;
2430         tcp_conn = conn->dd_data;
2431         cconn = tcp_conn->dd_data;
2432         cconn->iconn = conn;
2433
2434         log_debug(1 << CXGBI_DBG_ISCSI,
2435                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2436                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2437
2438         return cls_conn;
2439 }
2440 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2441
2442 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2443                                 struct iscsi_cls_conn *cls_conn,
2444                                 u64 transport_eph, int is_leading)
2445 {
2446         struct iscsi_conn *conn = cls_conn->dd_data;
2447         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2448         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2449         struct iscsi_endpoint *ep;
2450         struct cxgbi_endpoint *cep;
2451         struct cxgbi_sock *csk;
2452         int err;
2453
2454         ep = iscsi_lookup_endpoint(transport_eph);
2455         if (!ep)
2456                 return -EINVAL;
2457
2458         /*  setup ddp pagesize */
2459         cep = ep->dd_data;
2460         csk = cep->csk;
2461         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2462         if (err < 0)
2463                 return err;
2464
2465         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2466         if (err)
2467                 return -EINVAL;
2468
2469         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2470         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2471
2472         write_lock_bh(&csk->callback_lock);
2473         csk->user_data = conn;
2474         cconn->chba = cep->chba;
2475         cconn->cep = cep;
2476         cep->cconn = cconn;
2477         write_unlock_bh(&csk->callback_lock);
2478
2479         cxgbi_conn_max_xmit_dlength(conn);
2480         cxgbi_conn_max_recv_dlength(conn);
2481
2482         log_debug(1 << CXGBI_DBG_ISCSI,
2483                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2484                 cls_session, cls_conn, ep, cconn, csk);
2485         /*  init recv engine */
2486         iscsi_tcp_hdr_recv_prep(tcp_conn);
2487
2488         return 0;
2489 }
2490 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2491
2492 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2493                                                 u16 cmds_max, u16 qdepth,
2494                                                 u32 initial_cmdsn)
2495 {
2496         struct cxgbi_endpoint *cep;
2497         struct cxgbi_hba *chba;
2498         struct Scsi_Host *shost;
2499         struct iscsi_cls_session *cls_session;
2500         struct iscsi_session *session;
2501
2502         if (!ep) {
2503                 pr_err("missing endpoint.\n");
2504                 return NULL;
2505         }
2506
2507         cep = ep->dd_data;
2508         chba = cep->chba;
2509         shost = chba->shost;
2510
2511         BUG_ON(chba != iscsi_host_priv(shost));
2512
2513         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2514                                         cmds_max, 0,
2515                                         sizeof(struct iscsi_tcp_task) +
2516                                         sizeof(struct cxgbi_task_data),
2517                                         initial_cmdsn, ISCSI_MAX_TARGET);
2518         if (!cls_session)
2519                 return NULL;
2520
2521         session = cls_session->dd_data;
2522         if (iscsi_tcp_r2tpool_alloc(session))
2523                 goto remove_session;
2524
2525         log_debug(1 << CXGBI_DBG_ISCSI,
2526                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2527         return cls_session;
2528
2529 remove_session:
2530         iscsi_session_teardown(cls_session);
2531         return NULL;
2532 }
2533 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2534
2535 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2536 {
2537         log_debug(1 << CXGBI_DBG_ISCSI,
2538                 "cls sess 0x%p.\n", cls_session);
2539
2540         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2541         iscsi_session_teardown(cls_session);
2542 }
2543 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2544
2545 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2546                         char *buf, int buflen)
2547 {
2548         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2549
2550         if (!chba->ndev) {
2551                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2552                                 "netdev for host not set.\n");
2553                 return -ENODEV;
2554         }
2555
2556         log_debug(1 << CXGBI_DBG_ISCSI,
2557                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2558                 shost, chba, chba->ndev->name, param, buflen, buf);
2559
2560         switch (param) {
2561         case ISCSI_HOST_PARAM_IPADDRESS:
2562         {
2563                 __be32 addr = in_aton(buf);
2564                 log_debug(1 << CXGBI_DBG_ISCSI,
2565                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2566                 cxgbi_set_iscsi_ipv4(chba, addr);
2567                 return 0;
2568         }
2569         case ISCSI_HOST_PARAM_HWADDRESS:
2570         case ISCSI_HOST_PARAM_NETDEV_NAME:
2571                 return 0;
2572         default:
2573                 return iscsi_host_set_param(shost, param, buf, buflen);
2574         }
2575 }
2576 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2577
2578 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2579                         char *buf)
2580 {
2581         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2582         int len = 0;
2583
2584         if (!chba->ndev) {
2585                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2586                                 "netdev for host not set.\n");
2587                 return -ENODEV;
2588         }
2589
2590         log_debug(1 << CXGBI_DBG_ISCSI,
2591                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2592                 shost, chba, chba->ndev->name, param);
2593
2594         switch (param) {
2595         case ISCSI_HOST_PARAM_HWADDRESS:
2596                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2597                 break;
2598         case ISCSI_HOST_PARAM_NETDEV_NAME:
2599                 len = sprintf(buf, "%s\n", chba->ndev->name);
2600                 break;
2601         case ISCSI_HOST_PARAM_IPADDRESS:
2602         {
2603                 __be32 addr;
2604
2605                 addr = cxgbi_get_iscsi_ipv4(chba);
2606                 len = sprintf(buf, "%pI4", &addr);
2607                 log_debug(1 << CXGBI_DBG_ISCSI,
2608                         "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2609                 break;
2610         }
2611         default:
2612                 return iscsi_host_get_param(shost, param, buf);
2613         }
2614
2615         return len;
2616 }
2617 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2618
2619 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2620                                         struct sockaddr *dst_addr,
2621                                         int non_blocking)
2622 {
2623         struct iscsi_endpoint *ep;
2624         struct cxgbi_endpoint *cep;
2625         struct cxgbi_hba *hba = NULL;
2626         struct cxgbi_sock *csk;
2627         int err = -EINVAL;
2628
2629         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2630                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2631                 shost, non_blocking, dst_addr);
2632
2633         if (shost) {
2634                 hba = iscsi_host_priv(shost);
2635                 if (!hba) {
2636                         pr_info("shost 0x%p, priv NULL.\n", shost);
2637                         goto err_out;
2638                 }
2639         }
2640
2641         if (dst_addr->sa_family == AF_INET) {
2642                 csk = cxgbi_check_route(dst_addr);
2643 #if IS_ENABLED(CONFIG_IPV6)
2644         } else if (dst_addr->sa_family == AF_INET6) {
2645                 csk = cxgbi_check_route6(dst_addr);
2646 #endif
2647         } else {
2648                 pr_info("address family 0x%x NOT supported.\n",
2649                         dst_addr->sa_family);
2650                 err = -EAFNOSUPPORT;
2651                 return (struct iscsi_endpoint *)ERR_PTR(err);
2652         }
2653
2654         if (IS_ERR(csk))
2655                 return (struct iscsi_endpoint *)csk;
2656         cxgbi_sock_get(csk);
2657
2658         if (!hba)
2659                 hba = csk->cdev->hbas[csk->port_id];
2660         else if (hba != csk->cdev->hbas[csk->port_id]) {
2661                 pr_info("Could not connect through requested host %u"
2662                         "hba 0x%p != 0x%p (%u).\n",
2663                         shost->host_no, hba,
2664                         csk->cdev->hbas[csk->port_id], csk->port_id);
2665                 err = -ENOSPC;
2666                 goto release_conn;
2667         }
2668
2669         err = sock_get_port(csk);
2670         if (err)
2671                 goto release_conn;
2672
2673         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2674         err = csk->cdev->csk_init_act_open(csk);
2675         if (err)
2676                 goto release_conn;
2677
2678         if (cxgbi_sock_is_closing(csk)) {
2679                 err = -ENOSPC;
2680                 pr_info("csk 0x%p is closing.\n", csk);
2681                 goto release_conn;
2682         }
2683
2684         ep = iscsi_create_endpoint(sizeof(*cep));
2685         if (!ep) {
2686                 err = -ENOMEM;
2687                 pr_info("iscsi alloc ep, OOM.\n");
2688                 goto release_conn;
2689         }
2690
2691         cep = ep->dd_data;
2692         cep->csk = csk;
2693         cep->chba = hba;
2694
2695         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2696                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2697                 ep, cep, csk, hba, hba->ndev->name);
2698         return ep;
2699
2700 release_conn:
2701         cxgbi_sock_put(csk);
2702         cxgbi_sock_closed(csk);
2703 err_out:
2704         return ERR_PTR(err);
2705 }
2706 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2707
2708 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2709 {
2710         struct cxgbi_endpoint *cep = ep->dd_data;
2711         struct cxgbi_sock *csk = cep->csk;
2712
2713         if (!cxgbi_sock_is_established(csk))
2714                 return 0;
2715         return 1;
2716 }
2717 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2718
2719 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2720 {
2721         struct cxgbi_endpoint *cep = ep->dd_data;
2722         struct cxgbi_conn *cconn = cep->cconn;
2723         struct cxgbi_sock *csk = cep->csk;
2724
2725         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2726                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2727                 ep, cep, cconn, csk, csk->state, csk->flags);
2728
2729         if (cconn && cconn->iconn) {
2730                 iscsi_suspend_tx(cconn->iconn);
2731                 write_lock_bh(&csk->callback_lock);
2732                 cep->csk->user_data = NULL;
2733                 cconn->cep = NULL;
2734                 write_unlock_bh(&csk->callback_lock);
2735         }
2736         iscsi_destroy_endpoint(ep);
2737
2738         if (likely(csk->state >= CTP_ESTABLISHED))
2739                 need_active_close(csk);
2740         else
2741                 cxgbi_sock_closed(csk);
2742
2743         cxgbi_sock_put(csk);
2744 }
2745 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2746
2747 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2748                         struct scsi_transport_template **stt)
2749 {
2750         *stt = iscsi_register_transport(itp);
2751         if (*stt == NULL) {
2752                 pr_err("unable to register %s transport 0x%p.\n",
2753                         itp->name, itp);
2754                 return -ENODEV;
2755         }
2756         log_debug(1 << CXGBI_DBG_ISCSI,
2757                 "%s, registered iscsi transport 0x%p.\n",
2758                 itp->name, stt);
2759         return 0;
2760 }
2761 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2762
2763 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2764                         struct scsi_transport_template **stt)
2765 {
2766         if (*stt) {
2767                 log_debug(1 << CXGBI_DBG_ISCSI,
2768                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2769                         itp, itp->name, *stt);
2770                 *stt = NULL;
2771                 iscsi_unregister_transport(itp);
2772         }
2773 }
2774 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2775
2776 umode_t cxgbi_attr_is_visible(int param_type, int param)
2777 {
2778         switch (param_type) {
2779         case ISCSI_HOST_PARAM:
2780                 switch (param) {
2781                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2782                 case ISCSI_HOST_PARAM_HWADDRESS:
2783                 case ISCSI_HOST_PARAM_IPADDRESS:
2784                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2785                         return S_IRUGO;
2786                 default:
2787                         return 0;
2788                 }
2789         case ISCSI_PARAM:
2790                 switch (param) {
2791                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2792                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2793                 case ISCSI_PARAM_HDRDGST_EN:
2794                 case ISCSI_PARAM_DATADGST_EN:
2795                 case ISCSI_PARAM_CONN_ADDRESS:
2796                 case ISCSI_PARAM_CONN_PORT:
2797                 case ISCSI_PARAM_EXP_STATSN:
2798                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2799                 case ISCSI_PARAM_PERSISTENT_PORT:
2800                 case ISCSI_PARAM_PING_TMO:
2801                 case ISCSI_PARAM_RECV_TMO:
2802                 case ISCSI_PARAM_INITIAL_R2T_EN:
2803                 case ISCSI_PARAM_MAX_R2T:
2804                 case ISCSI_PARAM_IMM_DATA_EN:
2805                 case ISCSI_PARAM_FIRST_BURST:
2806                 case ISCSI_PARAM_MAX_BURST:
2807                 case ISCSI_PARAM_PDU_INORDER_EN:
2808                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2809                 case ISCSI_PARAM_ERL:
2810                 case ISCSI_PARAM_TARGET_NAME:
2811                 case ISCSI_PARAM_TPGT:
2812                 case ISCSI_PARAM_USERNAME:
2813                 case ISCSI_PARAM_PASSWORD:
2814                 case ISCSI_PARAM_USERNAME_IN:
2815                 case ISCSI_PARAM_PASSWORD_IN:
2816                 case ISCSI_PARAM_FAST_ABORT:
2817                 case ISCSI_PARAM_ABORT_TMO:
2818                 case ISCSI_PARAM_LU_RESET_TMO:
2819                 case ISCSI_PARAM_TGT_RESET_TMO:
2820                 case ISCSI_PARAM_IFACE_NAME:
2821                 case ISCSI_PARAM_INITIATOR_NAME:
2822                         return S_IRUGO;
2823                 default:
2824                         return 0;
2825                 }
2826         }
2827
2828         return 0;
2829 }
2830 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2831
2832 static int __init libcxgbi_init_module(void)
2833 {
2834         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2835         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2836
2837         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2838                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2839                 ISCSI_AGE_MASK, sw_tag_age_bits);
2840
2841         ddp_setup_host_page_size();
2842         return 0;
2843 }
2844
2845 static void __exit libcxgbi_exit_module(void)
2846 {
2847         cxgbi_device_unregister_all(0xFF);
2848         return;
2849 }
2850
2851 module_init(libcxgbi_init_module);
2852 module_exit(libcxgbi_exit_module);