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 static LIST_HEAD(cdev_rcu_list);
  61 static DEFINE_SPINLOCK(cdev_rcu_lock);
  62
  63 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  64                                 unsigned int max_conn)
  65 {
  66         struct cxgbi_ports_map *pmap = &cdev->pmap;
  67
  68         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  69                                              sizeof(struct cxgbi_sock *),
  70                                              GFP_KERNEL);
  71         if (!pmap->port_csk) {
  72                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  73                 return -ENOMEM;
  74         }
  75
  76         pmap->max_connect = max_conn;
  77         pmap->sport_base = base;
  78         spin_lock_init(&pmap->lock);
  79         return 0;
  80 }
  81 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  82
  83 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  84 {
  85         struct cxgbi_ports_map *pmap = &cdev->pmap;
  86         struct cxgbi_sock *csk;
  87         int i;
  88
  89         for (i = 0; i < pmap->max_connect; i++) {
  90                 if (pmap->port_csk[i]) {
  91                         csk = pmap->port_csk[i];
  92                         pmap->port_csk[i] = NULL;
  93                         log_debug(1 << CXGBI_DBG_SOCK,
  94                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  95                                 csk, cdev);
  96                         spin_lock_bh(&csk->lock);
  97                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
  98                         cxgbi_sock_closed(csk);
  99                         spin_unlock_bh(&csk->lock);
 100                         cxgbi_sock_put(csk);
 101                 }
 102         }
 103 }
 104 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 105
 106 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 107 {
 108         log_debug(1 << CXGBI_DBG_DEV,
 109                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 110         cxgbi_hbas_remove(cdev);
 111         cxgbi_device_portmap_cleanup(cdev);
 112         if (cdev->dev_ddp_cleanup)
 113                 cdev->dev_ddp_cleanup(cdev);
 114         else
 115                 cxgbi_ddp_cleanup(cdev);
 116         if (cdev->ddp)
 117                 cxgbi_ddp_cleanup(cdev);
 118         if (cdev->pmap.max_connect)
 119                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 120         kfree(cdev);
 121 }
 122
 123 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 124                                            unsigned int nports)
 125 {
 126         struct cxgbi_device *cdev;
 127
 128         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 129                         (sizeof(struct cxgbi_hba *) +
 130                          sizeof(struct net_device *)),
 131                         GFP_KERNEL);
 132         if (!cdev) {
 133                 pr_warn("nport %d, OOM.\n", nports);
 134                 return NULL;
 135         }
 136         cdev->ports = (struct net_device **)(cdev + 1);
 137         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 138                                                 sizeof(struct net_device *));
 139         if (extra)
 140                 cdev->dd_data = ((char *)cdev->hbas) +
 141                                 nports * sizeof(struct cxgbi_hba *);
 142         spin_lock_init(&cdev->pmap.lock);
 143
 144         mutex_lock(&cdev_mutex);
 145         list_add_tail(&cdev->list_head, &cdev_list);
 146         mutex_unlock(&cdev_mutex);
 147
 148         spin_lock(&cdev_rcu_lock);
 149         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 150         spin_unlock(&cdev_rcu_lock);
 151
 152         log_debug(1 << CXGBI_DBG_DEV,
 153                 "cdev 0x%p, p# %u.\n", cdev, nports);
 154         return cdev;
 155 }
 156 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 157
 158 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 159 {
 160         log_debug(1 << CXGBI_DBG_DEV,
 161                 "cdev 0x%p, p# %u,%s.\n",
 162                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 163
 164         mutex_lock(&cdev_mutex);
 165         list_del(&cdev->list_head);
 166         mutex_unlock(&cdev_mutex);
 167
 168         spin_lock(&cdev_rcu_lock);
 169         list_del_rcu(&cdev->rcu_node);
 170         spin_unlock(&cdev_rcu_lock);
 171         synchronize_rcu();
 172
 173         cxgbi_device_destroy(cdev);
 174 }
 175 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 176
 177 void cxgbi_device_unregister_all(unsigned int flag)
 178 {
 179         struct cxgbi_device *cdev, *tmp;
 180
 181         mutex_lock(&cdev_mutex);
 182         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 183                 if ((cdev->flags & flag) == flag) {
 184                         mutex_unlock(&cdev_mutex);
 185                         cxgbi_device_unregister(cdev);
 186                         mutex_lock(&cdev_mutex);
 187                 }
 188         }
 189         mutex_unlock(&cdev_mutex);
 190 }
 191 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 192
 193 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 194 {
 195         struct cxgbi_device *cdev, *tmp;
 196
 197         mutex_lock(&cdev_mutex);
 198         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 199                 if (cdev->lldev == lldev) {
 200                         mutex_unlock(&cdev_mutex);
 201                         return cdev;
 202                 }
 203         }
 204         mutex_unlock(&cdev_mutex);
 205
 206         log_debug(1 << CXGBI_DBG_DEV,
 207                 "lldev 0x%p, NO match found.\n", lldev);
 208         return NULL;
 209 }
 210 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 211
 212 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 213                                                  int *port)
 214 {
 215         struct net_device *vdev = NULL;
 216         struct cxgbi_device *cdev, *tmp;
 217         int i;
 218
 219         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 220                 vdev = ndev;
 221                 ndev = vlan_dev_real_dev(ndev);
 222                 log_debug(1 << CXGBI_DBG_DEV,
 223                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 224         }
 225
 226         mutex_lock(&cdev_mutex);
 227         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 228                 for (i = 0; i < cdev->nports; i++) {
 229                         if (ndev == cdev->ports[i]) {
 230                                 cdev->hbas[i]->vdev = vdev;
 231                                 mutex_unlock(&cdev_mutex);
 232                                 if (port)
 233                                         *port = i;
 234                                 return cdev;
 235                         }
 236                 }
 237         }
 238         mutex_unlock(&cdev_mutex);
 239         log_debug(1 << CXGBI_DBG_DEV,
 240                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 241         return NULL;
 242 }
 243 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 244
 245 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 246                                                      int *port)
 247 {
 248         struct net_device *vdev = NULL;
 249         struct cxgbi_device *cdev;
 250         int i;
 251
 252         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 253                 vdev = ndev;
 254                 ndev = vlan_dev_real_dev(ndev);
 255                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 256         }
 257
 258         rcu_read_lock();
 259         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 260                 for (i = 0; i < cdev->nports; i++) {
 261                         if (ndev == cdev->ports[i]) {
 262                                 cdev->hbas[i]->vdev = vdev;
 263                                 rcu_read_unlock();
 264                                 if (port)
 265                                         *port = i;
 266                                 return cdev;
 267                         }
 268                 }
 269         }
 270         rcu_read_unlock();
 271
 272         log_debug(1 << CXGBI_DBG_DEV,
 273                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 274         return NULL;
 275 }
 276 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 277
 278 #if IS_ENABLED(CONFIG_IPV6)
 279 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 280                                                      int *port)
 281 {
 282         struct net_device *vdev = NULL;
 283         struct cxgbi_device *cdev, *tmp;
 284         int i;
 285
 286         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 287                 vdev = ndev;
 288                 ndev = vlan_dev_real_dev(ndev);
 289                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 290         }
 291
 292         mutex_lock(&cdev_mutex);
 293         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 294                 for (i = 0; i < cdev->nports; i++) {
 295                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 296                                     MAX_ADDR_LEN)) {
 297                                 cdev->hbas[i]->vdev = vdev;
 298                                 mutex_unlock(&cdev_mutex);
 299                                 if (port)
 300                                         *port = i;
 301                                 return cdev;
 302                         }
 303                 }
 304         }
 305         mutex_unlock(&cdev_mutex);
 306         log_debug(1 << CXGBI_DBG_DEV,
 307                   "ndev 0x%p, %s, NO match mac found.\n",
 308                   ndev, ndev->name);
 309         return NULL;
 310 }
 311 #endif
 312
 313 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 314 {
 315         int i;
 316         struct cxgbi_hba *chba;
 317
 318         log_debug(1 << CXGBI_DBG_DEV,
 319                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 320
 321         for (i = 0; i < cdev->nports; i++) {
 322                 chba = cdev->hbas[i];
 323                 if (chba) {
 324                         cdev->hbas[i] = NULL;
 325                         iscsi_host_remove(chba->shost);
 326                         pci_dev_put(cdev->pdev);
 327                         iscsi_host_free(chba->shost);
 328                 }
 329         }
 330 }
 331 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 332
 333 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 334                 unsigned int max_id, struct scsi_host_template *sht,
 335                 struct scsi_transport_template *stt)
 336 {
 337         struct cxgbi_hba *chba;
 338         struct Scsi_Host *shost;
 339         int i, err;
 340
 341         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 342
 343         for (i = 0; i < cdev->nports; i++) {
 344                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 345                 if (!shost) {
 346                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 347                                 cdev, i, cdev->ports[i]->name);
 348                         err = -ENOMEM;
 349                         goto err_out;
 350                 }
 351
 352                 shost->transportt = stt;
 353                 shost->max_lun = max_lun;
 354                 shost->max_id = max_id;
 355                 shost->max_channel = 0;
 356                 shost->max_cmd_len = 16;
 357
 358                 chba = iscsi_host_priv(shost);
 359                 chba->cdev = cdev;
 360                 chba->ndev = cdev->ports[i];
 361                 chba->shost = shost;
 362
 363                 log_debug(1 << CXGBI_DBG_DEV,
 364                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 365                         cdev, i, cdev->ports[i]->name, chba);
 366
 367                 pci_dev_get(cdev->pdev);
 368                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 369                 if (err) {
 370                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 371                                 cdev, i, cdev->ports[i]->name);
 372                         pci_dev_put(cdev->pdev);
 373                         scsi_host_put(shost);
 374                         goto  err_out;
 375                 }
 376
 377                 cdev->hbas[i] = chba;
 378         }
 379
 380         return 0;
 381
 382 err_out:
 383         cxgbi_hbas_remove(cdev);
 384         return err;
 385 }
 386 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 387
 388 /*
 389  * iSCSI offload
 390  *
 391  * - source port management
 392  *   To find a free source port in the port allocation map we use a very simple
 393  *   rotor scheme to look for the next free port.
 394  *
 395  *   If a source port has been specified make sure that it doesn't collide with
 396  *   our normal source port allocation map.  If it's outside the range of our
 397  *   allocation/deallocation scheme just let them use it.
 398  *
 399  *   If the source port is outside our allocation range, the caller is
 400  *   responsible for keeping track of their port usage.
 401  */
 402 static int sock_get_port(struct cxgbi_sock *csk)
 403 {
 404         struct cxgbi_device *cdev = csk->cdev;
 405         struct cxgbi_ports_map *pmap = &cdev->pmap;
 406         unsigned int start;
 407         int idx;
 408         __be16 *port;
 409
 410         if (!pmap->max_connect) {
 411                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 412                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 413                 return -EADDRNOTAVAIL;
 414         }
 415
 416         if (csk->csk_family == AF_INET)
 417                 port = &csk->saddr.sin_port;
 418         else /* ipv6 */
 419                 port = &csk->saddr6.sin6_port;
 420
 421         if (*port) {
 422                 pr_err("source port NON-ZERO %u.\n",
 423                         ntohs(*port));
 424                 return -EADDRINUSE;
 425         }
 426
 427         spin_lock_bh(&pmap->lock);
 428         if (pmap->used >= pmap->max_connect) {
 429                 spin_unlock_bh(&pmap->lock);
 430                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 431                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 432                 return -EADDRNOTAVAIL;
 433         }
 434
 435         start = idx = pmap->next;
 436         do {
 437                 if (++idx >= pmap->max_connect)
 438                         idx = 0;
 439                 if (!pmap->port_csk[idx]) {
 440                         pmap->used++;
 441                         *port = htons(pmap->sport_base + idx);
 442                         pmap->next = idx;
 443                         pmap->port_csk[idx] = csk;
 444                         spin_unlock_bh(&pmap->lock);
 445                         cxgbi_sock_get(csk);
 446                         log_debug(1 << CXGBI_DBG_SOCK,
 447                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 448                                 cdev, csk->port_id,
 449                                 cdev->ports[csk->port_id]->name,
 450                                 pmap->sport_base + idx, pmap->next);
 451                         return 0;
 452                 }
 453         } while (idx != start);
 454         spin_unlock_bh(&pmap->lock);
 455
 456         /* should not happen */
 457         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 458                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 459                 pmap->next);
 460         return -EADDRNOTAVAIL;
 461 }
 462
 463 static void sock_put_port(struct cxgbi_sock *csk)
 464 {
 465         struct cxgbi_device *cdev = csk->cdev;
 466         struct cxgbi_ports_map *pmap = &cdev->pmap;
 467         __be16 *port;
 468
 469         if (csk->csk_family == AF_INET)
 470                 port = &csk->saddr.sin_port;
 471         else /* ipv6 */
 472                 port = &csk->saddr6.sin6_port;
 473
 474         if (*port) {
 475                 int idx = ntohs(*port) - pmap->sport_base;
 476
 477                 *port = 0;
 478                 if (idx < 0 || idx >= pmap->max_connect) {
 479                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 480                                 cdev, csk->port_id,
 481                                 cdev->ports[csk->port_id]->name,
 482                                 ntohs(*port));
 483                         return;
 484                 }
 485
 486                 spin_lock_bh(&pmap->lock);
 487                 pmap->port_csk[idx] = NULL;
 488                 pmap->used--;
 489                 spin_unlock_bh(&pmap->lock);
 490
 491                 log_debug(1 << CXGBI_DBG_SOCK,
 492                         "cdev 0x%p, p#%u %s, release %u.\n",
 493                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 494                         pmap->sport_base + idx);
 495
 496                 cxgbi_sock_put(csk);
 497         }
 498 }
 499
 500 /*
 501  * iscsi tcp connection
 502  */
 503 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 504 {
 505         if (csk->cpl_close) {
 506                 kfree_skb(csk->cpl_close);
 507                 csk->cpl_close = NULL;
 508         }
 509         if (csk->cpl_abort_req) {
 510                 kfree_skb(csk->cpl_abort_req);
 511                 csk->cpl_abort_req = NULL;
 512         }
 513         if (csk->cpl_abort_rpl) {
 514                 kfree_skb(csk->cpl_abort_rpl);
 515                 csk->cpl_abort_rpl = NULL;
 516         }
 517 }
 518 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 519
 520 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 521 {
 522         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 523
 524         if (!csk) {
 525                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 526                 return NULL;
 527         }
 528
 529         if (cdev->csk_alloc_cpls(csk) < 0) {
 530                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 531                 kfree(csk);
 532                 return NULL;
 533         }
 534
 535         spin_lock_init(&csk->lock);
 536         kref_init(&csk->refcnt);
 537         skb_queue_head_init(&csk->receive_queue);
 538         skb_queue_head_init(&csk->write_queue);
 539         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 540         rwlock_init(&csk->callback_lock);
 541         csk->cdev = cdev;
 542         csk->flags = 0;
 543         cxgbi_sock_set_state(csk, CTP_CLOSED);
 544
 545         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 546
 547         return csk;
 548 }
 549
 550 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 551                                       __be32 saddr, __be32 daddr,
 552                                       __be16 sport, __be16 dport, u8 tos)
 553 {
 554         struct rtable *rt;
 555
 556         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 557                                    dport, sport, IPPROTO_TCP, tos, 0);
 558         if (IS_ERR(rt))
 559                 return NULL;
 560
 561         return rt;
 562 }
 563
 564 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 565 {
 566         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 567         struct dst_entry *dst;
 568         struct net_device *ndev;
 569         struct cxgbi_device *cdev;
 570         struct rtable *rt = NULL;
 571         struct neighbour *n;
 572         struct flowi4 fl4;
 573         struct cxgbi_sock *csk = NULL;
 574         unsigned int mtu = 0;
 575         int port = 0xFFFF;
 576         int err = 0;
 577
 578         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 579         if (!rt) {
 580                 pr_info("no route to ipv4 0x%x, port %u.\n",
 581                         be32_to_cpu(daddr->sin_addr.s_addr),
 582                         be16_to_cpu(daddr->sin_port));
 583                 err = -ENETUNREACH;
 584                 goto err_out;
 585         }
 586         dst = &rt->dst;
 587         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 588         if (!n) {
 589                 err = -ENODEV;
 590                 goto rel_rt;
 591         }
 592         ndev = n->dev;
 593
 594         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 595                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 596                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 597                         ndev->name);
 598                 err = -ENETUNREACH;
 599                 goto rel_neigh;
 600         }
 601
 602         if (ndev->flags & IFF_LOOPBACK) {
 603                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 604                 mtu = ndev->mtu;
 605                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 606                         n->dev->name, ndev->name, mtu);
 607         }
 608
 609         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 610         if (!cdev) {
 611                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 612                         &daddr->sin_addr.s_addr, ndev->name);
 613                 err = -ENETUNREACH;
 614                 goto rel_neigh;
 615         }
 616         log_debug(1 << CXGBI_DBG_SOCK,
 617                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 618                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 619                            port, ndev->name, cdev);
 620
 621         csk = cxgbi_sock_create(cdev);
 622         if (!csk) {
 623                 err = -ENOMEM;
 624                 goto rel_neigh;
 625         }
 626         csk->cdev = cdev;
 627         csk->port_id = port;
 628         csk->mtu = mtu;
 629         csk->dst = dst;
 630
 631         csk->csk_family = AF_INET;
 632         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 633         csk->daddr.sin_port = daddr->sin_port;
 634         csk->daddr.sin_family = daddr->sin_family;
 635         csk->saddr.sin_family = daddr->sin_family;
 636         csk->saddr.sin_addr.s_addr = fl4.saddr;
 637         neigh_release(n);
 638
 639         return csk;
 640
 641 rel_neigh:
 642         neigh_release(n);
 643
 644 rel_rt:
 645         ip_rt_put(rt);
 646         if (csk)
 647                 cxgbi_sock_closed(csk);
 648 err_out:
 649         return ERR_PTR(err);
 650 }
 651
 652 #if IS_ENABLED(CONFIG_IPV6)
 653 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 654                                         const struct in6_addr *daddr)
 655 {
 656         struct flowi6 fl;
 657
 658         if (saddr)
 659                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 660         if (daddr)
 661                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 662         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 663 }
 664
 665 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 666 {
 667         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 668         struct dst_entry *dst;
 669         struct net_device *ndev;
 670         struct cxgbi_device *cdev;
 671         struct rt6_info *rt = NULL;
 672         struct neighbour *n;
 673         struct in6_addr pref_saddr;
 674         struct cxgbi_sock *csk = NULL;
 675         unsigned int mtu = 0;
 676         int port = 0xFFFF;
 677         int err = 0;
 678
 679         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 680
 681         if (!rt) {
 682                 pr_info("no route to ipv6 %pI6 port %u\n",
 683                         daddr6->sin6_addr.s6_addr,
 684                         be16_to_cpu(daddr6->sin6_port));
 685                 err = -ENETUNREACH;
 686                 goto err_out;
 687         }
 688
 689         dst = &rt->dst;
 690
 691         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 692
 693         if (!n) {
 694                 pr_info("%pI6, port %u, dst no neighbour.\n",
 695                         daddr6->sin6_addr.s6_addr,
 696                         be16_to_cpu(daddr6->sin6_port));
 697                 err = -ENETUNREACH;
 698                 goto rel_rt;
 699         }
 700         ndev = n->dev;
 701
 702         if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
 703                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 704                         daddr6->sin6_addr.s6_addr,
 705                         ntohs(daddr6->sin6_port), ndev->name);
 706                 err = -ENETUNREACH;
 707                 goto rel_rt;
 708         }
 709
 710         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 711         if (!cdev)
 712                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 713         if (!cdev) {
 714                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 715                         daddr6->sin6_addr.s6_addr, ndev->name);
 716                 err = -ENETUNREACH;
 717                 goto rel_rt;
 718         }
 719         log_debug(1 << CXGBI_DBG_SOCK,
 720                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 721                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 722                   ndev->name, cdev);
 723
 724         csk = cxgbi_sock_create(cdev);
 725         if (!csk) {
 726                 err = -ENOMEM;
 727                 goto rel_rt;
 728         }
 729         csk->cdev = cdev;
 730         csk->port_id = port;
 731         csk->mtu = mtu;
 732         csk->dst = dst;
 733
 734         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 735                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 736
 737                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 738                                          &daddr6->sin6_addr, 0, &pref_saddr);
 739                 if (err) {
 740                         pr_info("failed to get source address to reach %pI6\n",
 741                                 &daddr6->sin6_addr);
 742                         goto rel_rt;
 743                 }
 744         } else {
 745                 pref_saddr = rt->rt6i_prefsrc.addr;
 746         }
 747
 748         csk->csk_family = AF_INET6;
 749         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 750         csk->daddr6.sin6_port = daddr6->sin6_port;
 751         csk->daddr6.sin6_family = daddr6->sin6_family;
 752         csk->saddr6.sin6_addr = pref_saddr;
 753
 754         neigh_release(n);
 755         return csk;
 756
 757 rel_rt:
 758         if (n)
 759                 neigh_release(n);
 760
 761         ip6_rt_put(rt);
 762         if (csk)
 763                 cxgbi_sock_closed(csk);
 764 err_out:
 765         return ERR_PTR(err);
 766 }
 767 #endif /* IS_ENABLED(CONFIG_IPV6) */
 768
 769 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 770                         unsigned int opt)
 771 {
 772         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 773         dst_confirm(csk->dst);
 774         smp_mb();
 775         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 776 }
 777 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 778
 779 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 780 {
 781         log_debug(1 << CXGBI_DBG_SOCK,
 782                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 783                 csk, csk->state, csk->flags, csk->user_data);
 784
 785         if (csk->state != CTP_ESTABLISHED) {
 786                 read_lock_bh(&csk->callback_lock);
 787                 if (csk->user_data)
 788                         iscsi_conn_failure(csk->user_data,
 789                                         ISCSI_ERR_CONN_FAILED);
 790                 read_unlock_bh(&csk->callback_lock);
 791         }
 792 }
 793
 794 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 795 {
 796         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 797                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 798         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 799         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 800                 return;
 801         if (csk->saddr.sin_port)
 802                 sock_put_port(csk);
 803         if (csk->dst)
 804                 dst_release(csk->dst);
 805         csk->cdev->csk_release_offload_resources(csk);
 806         cxgbi_sock_set_state(csk, CTP_CLOSED);
 807         cxgbi_inform_iscsi_conn_closing(csk);
 808         cxgbi_sock_put(csk);
 809 }
 810 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 811
 812 static void need_active_close(struct cxgbi_sock *csk)
 813 {
 814         int data_lost;
 815         int close_req = 0;
 816
 817         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 818                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 819         spin_lock_bh(&csk->lock);
 820         dst_confirm(csk->dst);
 821         data_lost = skb_queue_len(&csk->receive_queue);
 822         __skb_queue_purge(&csk->receive_queue);
 823
 824         if (csk->state == CTP_ACTIVE_OPEN)
 825                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 826         else if (csk->state == CTP_ESTABLISHED) {
 827                 close_req = 1;
 828                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 829         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 830                 close_req = 1;
 831                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 832         }
 833
 834         if (close_req) {
 835                 if (data_lost)
 836                         csk->cdev->csk_send_abort_req(csk);
 837                 else
 838                         csk->cdev->csk_send_close_req(csk);
 839         }
 840
 841         spin_unlock_bh(&csk->lock);
 842 }
 843
 844 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 845 {
 846         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 847                         csk, csk->state, csk->flags,
 848                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 849                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 850                         errno);
 851
 852         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 853         csk->err = errno;
 854         cxgbi_sock_closed(csk);
 855 }
 856 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 857
 858 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 859 {
 860         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 861
 862         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 863                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 864         cxgbi_sock_get(csk);
 865         spin_lock_bh(&csk->lock);
 866         if (csk->state == CTP_ACTIVE_OPEN)
 867                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 868         spin_unlock_bh(&csk->lock);
 869         cxgbi_sock_put(csk);
 870         __kfree_skb(skb);
 871 }
 872 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 873
 874 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 875 {
 876         cxgbi_sock_get(csk);
 877         spin_lock_bh(&csk->lock);
 878         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 879                 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
 880                         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 881                 else {
 882                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
 883                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 884                         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 885                                 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 886                                         csk, csk->state, csk->flags, csk->tid);
 887                         cxgbi_sock_closed(csk);
 888                 }
 889         }
 890         spin_unlock_bh(&csk->lock);
 891         cxgbi_sock_put(csk);
 892 }
 893 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 894
 895 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 896 {
 897         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 898                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 899         cxgbi_sock_get(csk);
 900         spin_lock_bh(&csk->lock);
 901
 902         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 903                 goto done;
 904
 905         switch (csk->state) {
 906         case CTP_ESTABLISHED:
 907                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 908                 break;
 909         case CTP_ACTIVE_CLOSE:
 910                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 911                 break;
 912         case CTP_CLOSE_WAIT_1:
 913                 cxgbi_sock_closed(csk);
 914                 break;
 915         case CTP_ABORTING:
 916                 break;
 917         default:
 918                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 919                         csk, csk->state, csk->flags, csk->tid);
 920         }
 921         cxgbi_inform_iscsi_conn_closing(csk);
 922 done:
 923         spin_unlock_bh(&csk->lock);
 924         cxgbi_sock_put(csk);
 925 }
 926 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 927
 928 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 929 {
 930         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 931                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 932         cxgbi_sock_get(csk);
 933         spin_lock_bh(&csk->lock);
 934
 935         csk->snd_una = snd_nxt - 1;
 936         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 937                 goto done;
 938
 939         switch (csk->state) {
 940         case CTP_ACTIVE_CLOSE:
 941                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 942                 break;
 943         case CTP_CLOSE_WAIT_1:
 944         case CTP_CLOSE_WAIT_2:
 945                 cxgbi_sock_closed(csk);
 946                 break;
 947         case CTP_ABORTING:
 948                 break;
 949         default:
 950                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 951                         csk, csk->state, csk->flags, csk->tid);
 952         }
 953 done:
 954         spin_unlock_bh(&csk->lock);
 955         cxgbi_sock_put(csk);
 956 }
 957 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 958
 959 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 960                            unsigned int snd_una, int seq_chk)
 961 {
 962         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 963                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 964                         csk, csk->state, csk->flags, csk->tid, credits,
 965                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 966
 967         spin_lock_bh(&csk->lock);
 968
 969         csk->wr_cred += credits;
 970         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
 971                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
 972
 973         while (credits) {
 974                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
 975
 976                 if (unlikely(!p)) {
 977                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
 978                                 csk, csk->state, csk->flags, csk->tid, credits,
 979                                 csk->wr_cred, csk->wr_una_cred);
 980                         break;
 981                 }
 982
 983                 if (unlikely(credits < p->csum)) {
 984                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
 985                                 csk, csk->state, csk->flags, csk->tid,
 986                                 credits, csk->wr_cred, csk->wr_una_cred,
 987                                 p->csum);
 988                         p->csum -= credits;
 989                         break;
 990                 } else {
 991                         cxgbi_sock_dequeue_wr(csk);
 992                         credits -= p->csum;
 993                         kfree_skb(p);
 994                 }
 995         }
 996
 997         cxgbi_sock_check_wr_invariants(csk);
 998
 999         if (seq_chk) {
1000                 if (unlikely(before(snd_una, csk->snd_una))) {
1001                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1002                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1003                                 csk->snd_una);
1004                         goto done;
1005                 }
1006
1007                 if (csk->snd_una != snd_una) {
1008                         csk->snd_una = snd_una;
1009                         dst_confirm(csk->dst);
1010                 }
1011         }
1012
1013         if (skb_queue_len(&csk->write_queue)) {
1014                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1015                         cxgbi_conn_tx_open(csk);
1016         } else
1017                 cxgbi_conn_tx_open(csk);
1018 done:
1019         spin_unlock_bh(&csk->lock);
1020 }
1021 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1022
1023 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1024                                              unsigned short mtu)
1025 {
1026         int i = 0;
1027
1028         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1029                 ++i;
1030
1031         return i;
1032 }
1033
1034 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1035 {
1036         unsigned int idx;
1037         struct dst_entry *dst = csk->dst;
1038
1039         csk->advmss = dst_metric_advmss(dst);
1040
1041         if (csk->advmss > pmtu - 40)
1042                 csk->advmss = pmtu - 40;
1043         if (csk->advmss < csk->cdev->mtus[0] - 40)
1044                 csk->advmss = csk->cdev->mtus[0] - 40;
1045         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1046
1047         return idx;
1048 }
1049 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1050
1051 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1052 {
1053         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1054         __skb_queue_tail(&csk->write_queue, skb);
1055 }
1056 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1057
1058 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1059 {
1060         struct sk_buff *skb;
1061
1062         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1063                 kfree_skb(skb);
1064 }
1065 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1066
1067 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1068 {
1069         int pending = cxgbi_sock_count_pending_wrs(csk);
1070
1071         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1072                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1073                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1074 }
1075 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1076
1077 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1078 {
1079         struct cxgbi_device *cdev = csk->cdev;
1080         struct sk_buff *next;
1081         int err, copied = 0;
1082
1083         spin_lock_bh(&csk->lock);
1084
1085         if (csk->state != CTP_ESTABLISHED) {
1086                 log_debug(1 << CXGBI_DBG_PDU_TX,
1087                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1088                         csk, csk->state, csk->flags, csk->tid);
1089                 err = -EAGAIN;
1090                 goto out_err;
1091         }
1092
1093         if (csk->err) {
1094                 log_debug(1 << CXGBI_DBG_PDU_TX,
1095                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1096                         csk, csk->state, csk->flags, csk->tid, csk->err);
1097                 err = -EPIPE;
1098                 goto out_err;
1099         }
1100
1101         if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
1102                 log_debug(1 << CXGBI_DBG_PDU_TX,
1103                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1104                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1105                         csk->snd_una, cdev->snd_win);
1106                 err = -ENOBUFS;
1107                 goto out_err;
1108         }
1109
1110         while (skb) {
1111                 int frags = skb_shinfo(skb)->nr_frags +
1112                                 (skb->len != skb->data_len);
1113
1114                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1115                         pr_err("csk 0x%p, skb head %u < %u.\n",
1116                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1117                         err = -EINVAL;
1118                         goto out_err;
1119                 }
1120
1121                 if (frags >= SKB_WR_LIST_SIZE) {
1122                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1123                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1124                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1125                         err = -EINVAL;
1126                         goto out_err;
1127                 }
1128
1129                 next = skb->next;
1130                 skb->next = NULL;
1131                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1132                 cxgbi_sock_skb_entail(csk, skb);
1133                 copied += skb->len;
1134                 csk->write_seq += skb->len +
1135                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1136                 skb = next;
1137         }
1138 done:
1139         if (likely(skb_queue_len(&csk->write_queue)))
1140                 cdev->csk_push_tx_frames(csk, 1);
1141         spin_unlock_bh(&csk->lock);
1142         return copied;
1143
1144 out_err:
1145         if (copied == 0 && err == -EPIPE)
1146                 copied = csk->err ? csk->err : -EPIPE;
1147         else
1148                 copied = err;
1149         goto done;
1150 }
1151
1152 /*
1153  * Direct Data Placement -
1154  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1155  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1156  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1157  * The host memory address is programmed into h/w in the format of pagepod
1158  * entries.
1159  * The location of the pagepod entry is encoded into ddp tag which is used as
1160  * the base for ITT/TTT.
1161  */
1162
1163 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1164 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1165 static unsigned char page_idx = DDP_PGIDX_MAX;
1166
1167 static unsigned char sw_tag_idx_bits;
1168 static unsigned char sw_tag_age_bits;
1169
1170 /*
1171  * Direct-Data Placement page size adjustment
1172  */
1173 static int ddp_adjust_page_table(void)
1174 {
1175         int i;
1176         unsigned int base_order, order;
1177
1178         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1179                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1180                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
1181                 return -EINVAL;
1182         }
1183
1184         base_order = get_order(1UL << ddp_page_shift[0]);
1185         order = get_order(1UL << PAGE_SHIFT);
1186
1187         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1188                 /* first is the kernel page size, then just doubling */
1189                 ddp_page_order[i] = order - base_order + i;
1190                 ddp_page_shift[i] = PAGE_SHIFT + i;
1191         }
1192         return 0;
1193 }
1194
1195 static int ddp_find_page_index(unsigned long pgsz)
1196 {
1197         int i;
1198
1199         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1200                 if (pgsz == (1UL << ddp_page_shift[i]))
1201                         return i;
1202         }
1203         pr_info("ddp page size %lu not supported.\n", pgsz);
1204         return DDP_PGIDX_MAX;
1205 }
1206
1207 static void ddp_setup_host_page_size(void)
1208 {
1209         if (page_idx == DDP_PGIDX_MAX) {
1210                 page_idx = ddp_find_page_index(PAGE_SIZE);
1211
1212                 if (page_idx == DDP_PGIDX_MAX) {
1213                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1214                         if (ddp_adjust_page_table() < 0) {
1215                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1216                                 return;
1217                         }
1218                         page_idx = ddp_find_page_index(PAGE_SIZE);
1219                 }
1220                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1221         }
1222 }
1223
1224 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1225 {
1226         int i;
1227
1228         for (i = 0; i < DDP_PGIDX_MAX; i++)
1229                 pgsz_factor[i] = ddp_page_order[i];
1230 }
1231 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1232
1233 /*
1234  * DDP setup & teardown
1235  */
1236
1237 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1238                         struct cxgbi_pagepod_hdr *hdr,
1239                         struct cxgbi_gather_list *gl, unsigned int gidx)
1240 {
1241         int i;
1242
1243         memcpy(ppod, hdr, sizeof(*hdr));
1244         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1245                 ppod->addr[i] = gidx < gl->nelem ?
1246                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1247         }
1248 }
1249 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1250
1251 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1252 {
1253         memset(ppod, 0, sizeof(*ppod));
1254 }
1255 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1256
1257 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1258                                         unsigned int start, unsigned int max,
1259                                         unsigned int count,
1260                                         struct cxgbi_gather_list *gl)
1261 {
1262         unsigned int i, j, k;
1263
1264         /*  not enough entries */
1265         if ((max - start) < count) {
1266                 log_debug(1 << CXGBI_DBG_DDP,
1267                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1268                 return -EBUSY;
1269         }
1270
1271         max -= count;
1272         spin_lock(&ddp->map_lock);
1273         for (i = start; i < max;) {
1274                 for (j = 0, k = i; j < count; j++, k++) {
1275                         if (ddp->gl_map[k])
1276                                 break;
1277                 }
1278                 if (j == count) {
1279                         for (j = 0, k = i; j < count; j++, k++)
1280                                 ddp->gl_map[k] = gl;
1281                         spin_unlock(&ddp->map_lock);
1282                         return i;
1283                 }
1284                 i += j + 1;
1285         }
1286         spin_unlock(&ddp->map_lock);
1287         log_debug(1 << CXGBI_DBG_DDP,
1288                 "NO suitable entries %u available.\n", count);
1289         return -EBUSY;
1290 }
1291
1292 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1293                                                 int start, int count)
1294 {
1295         spin_lock(&ddp->map_lock);
1296         memset(&ddp->gl_map[start], 0,
1297                 count * sizeof(struct cxgbi_gather_list *));
1298         spin_unlock(&ddp->map_lock);
1299 }
1300
1301 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1302                                         struct cxgbi_gather_list *gl)
1303 {
1304         int i;
1305
1306         for (i = 0; i < gl->nelem; i++)
1307                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1308                                 PCI_DMA_FROMDEVICE);
1309 }
1310
1311 static inline int ddp_gl_map(struct pci_dev *pdev,
1312                                     struct cxgbi_gather_list *gl)
1313 {
1314         int i;
1315
1316         for (i = 0; i < gl->nelem; i++) {
1317                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1318                                                 PAGE_SIZE,
1319                                                 PCI_DMA_FROMDEVICE);
1320                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1321                         log_debug(1 << CXGBI_DBG_DDP,
1322                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1323                                 i, gl->pages[i], pdev);
1324                         goto unmap;
1325                 }
1326         }
1327         return i;
1328 unmap:
1329         if (i) {
1330                 unsigned int nelem = gl->nelem;
1331
1332                 gl->nelem = i;
1333                 ddp_gl_unmap(pdev, gl);
1334                 gl->nelem = nelem;
1335         }
1336         return -EINVAL;
1337 }
1338
1339 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1340                                   struct pci_dev *pdev)
1341 {
1342         ddp_gl_unmap(pdev, gl);
1343         kfree(gl);
1344 }
1345
1346 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1347                                                     struct scatterlist *sgl,
1348                                                     unsigned int sgcnt,
1349                                                     struct pci_dev *pdev,
1350                                                     gfp_t gfp)
1351 {
1352         struct cxgbi_gather_list *gl;
1353         struct scatterlist *sg = sgl;
1354         struct page *sgpage = sg_page(sg);
1355         unsigned int sglen = sg->length;
1356         unsigned int sgoffset = sg->offset;
1357         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1358                                 PAGE_SHIFT;
1359         int i = 1, j = 0;
1360
1361         if (xferlen < DDP_THRESHOLD) {
1362                 log_debug(1 << CXGBI_DBG_DDP,
1363                         "xfer %u < threshold %u, no ddp.\n",
1364                         xferlen, DDP_THRESHOLD);
1365                 return NULL;
1366         }
1367
1368         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1369                      npages * (sizeof(dma_addr_t) +
1370                      sizeof(struct page *)), gfp);
1371         if (!gl) {
1372                 log_debug(1 << CXGBI_DBG_DDP,
1373                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1374                 return NULL;
1375         }
1376
1377          log_debug(1 << CXGBI_DBG_DDP,
1378                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1379
1380         gl->pages = (struct page **)&gl->phys_addr[npages];
1381         gl->nelem = npages;
1382         gl->length = xferlen;
1383         gl->offset = sgoffset;
1384         gl->pages[0] = sgpage;
1385
1386         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1387                 i++, sg = sg_next(sg)) {
1388                 struct page *page = sg_page(sg);
1389
1390                 if (sgpage == page && sg->offset == sgoffset + sglen)
1391                         sglen += sg->length;
1392                 else {
1393                         /*  make sure the sgl is fit for ddp:
1394                          *  each has the same page size, and
1395                          *  all of the middle pages are used completely
1396                          */
1397                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1398                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1399                                 log_debug(1 << CXGBI_DBG_DDP,
1400                                         "page %d/%u, %u + %u.\n",
1401                                         i, sgcnt, sgoffset, sglen);
1402                                 goto error_out;
1403                         }
1404
1405                         j++;
1406                         if (j == gl->nelem || sg->offset) {
1407                                 log_debug(1 << CXGBI_DBG_DDP,
1408                                         "page %d/%u, offset %u.\n",
1409                                         j, gl->nelem, sg->offset);
1410                                 goto error_out;
1411                         }
1412                         gl->pages[j] = page;
1413                         sglen = sg->length;
1414                         sgoffset = sg->offset;
1415                         sgpage = page;
1416                 }
1417         }
1418         gl->nelem = ++j;
1419
1420         if (ddp_gl_map(pdev, gl) < 0)
1421                 goto error_out;
1422
1423         return gl;
1424
1425 error_out:
1426         kfree(gl);
1427         return NULL;
1428 }
1429
1430 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1431 {
1432         struct cxgbi_device *cdev = chba->cdev;
1433         struct cxgbi_ddp_info *ddp = cdev->ddp;
1434         u32 idx;
1435
1436         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1437         if (idx < ddp->nppods) {
1438                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1439                 unsigned int npods;
1440
1441                 if (!gl || !gl->nelem) {
1442                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1443                                 tag, idx, gl, gl ? gl->nelem : 0);
1444                         return;
1445                 }
1446                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1447                 log_debug(1 << CXGBI_DBG_DDP,
1448                         "tag 0x%x, release idx %u, npods %u.\n",
1449                         tag, idx, npods);
1450                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1451                 ddp_unmark_entries(ddp, idx, npods);
1452                 ddp_release_gl(gl, ddp->pdev);
1453         } else
1454                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1455 }
1456
1457 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1458                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1459                            gfp_t gfp)
1460 {
1461         struct cxgbi_device *cdev = csk->cdev;
1462         struct cxgbi_ddp_info *ddp = cdev->ddp;
1463         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1464         struct cxgbi_pagepod_hdr hdr;
1465         unsigned int npods;
1466         int idx = -1;
1467         int err = -ENOMEM;
1468         u32 tag;
1469
1470         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1471         if (ddp->idx_last == ddp->nppods)
1472                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1473                                                         npods, gl);
1474         else {
1475                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1476                                                         ddp->nppods, npods,
1477                                                         gl);
1478                 if (idx < 0 && ddp->idx_last >= npods) {
1479                         idx = ddp_find_unused_entries(ddp, 0,
1480                                 min(ddp->idx_last + npods, ddp->nppods),
1481                                                         npods, gl);
1482                 }
1483         }
1484         if (idx < 0) {
1485                 log_debug(1 << CXGBI_DBG_DDP,
1486                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1487                         gl->length, gl->nelem, npods);
1488                 return idx;
1489         }
1490
1491         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1492         tag |= idx << PPOD_IDX_SHIFT;
1493
1494         hdr.rsvd = 0;
1495         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1496         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1497         hdr.max_offset = htonl(gl->length);
1498         hdr.page_offset = htonl(gl->offset);
1499
1500         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1501         if (err < 0)
1502                 goto unmark_entries;
1503
1504         ddp->idx_last = idx;
1505         log_debug(1 << CXGBI_DBG_DDP,
1506                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1507                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1508                 npods);
1509         *tagp = tag;
1510         return 0;
1511
1512 unmark_entries:
1513         ddp_unmark_entries(ddp, idx, npods);
1514         return err;
1515 }
1516
1517 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1518                         unsigned int sw_tag, unsigned int xferlen,
1519                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1520 {
1521         struct cxgbi_device *cdev = csk->cdev;
1522         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1523         struct cxgbi_gather_list *gl;
1524         int err;
1525
1526         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1527             xferlen < DDP_THRESHOLD) {
1528                 log_debug(1 << CXGBI_DBG_DDP,
1529                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1530                 return -EINVAL;
1531         }
1532
1533         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1534                 log_debug(1 << CXGBI_DBG_DDP,
1535                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1536                 return -EINVAL;
1537         }
1538
1539         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1540         if (!gl)
1541                 return -ENOMEM;
1542
1543         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1544         if (err < 0)
1545                 ddp_release_gl(gl, cdev->pdev);
1546
1547         return err;
1548 }
1549
1550 static void ddp_destroy(struct kref *kref)
1551 {
1552         struct cxgbi_ddp_info *ddp = container_of(kref,
1553                                                 struct cxgbi_ddp_info,
1554                                                 refcnt);
1555         struct cxgbi_device *cdev = ddp->cdev;
1556         int i = 0;
1557
1558         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1559
1560         while (i < ddp->nppods) {
1561                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1562
1563                 if (gl) {
1564                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1565                                         >> PPOD_PAGES_SHIFT;
1566                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1567                         kfree(gl);
1568                         i += npods;
1569                 } else
1570                         i++;
1571         }
1572         cxgbi_free_big_mem(ddp);
1573 }
1574
1575 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1576 {
1577         struct cxgbi_ddp_info *ddp = cdev->ddp;
1578
1579         log_debug(1 << CXGBI_DBG_DDP,
1580                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1581         cdev->ddp = NULL;
1582         if (ddp)
1583                 return kref_put(&ddp->refcnt, ddp_destroy);
1584         return 0;
1585 }
1586 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1587
1588 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1589                    unsigned int llimit, unsigned int ulimit,
1590                    unsigned int max_txsz, unsigned int max_rxsz)
1591 {
1592         struct cxgbi_ddp_info *ddp;
1593         unsigned int ppmax, bits;
1594
1595         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1596         bits = __ilog2_u32(ppmax) + 1;
1597         if (bits > PPOD_IDX_MAX_SIZE)
1598                 bits = PPOD_IDX_MAX_SIZE;
1599         ppmax = (1 << (bits - 1)) - 1;
1600
1601         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1602                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1603                                          sizeof(struct sk_buff *)),
1604                                 GFP_KERNEL);
1605         if (!ddp) {
1606                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1607                 return -ENOMEM;
1608         }
1609         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1610         cdev->ddp = ddp;
1611
1612         spin_lock_init(&ddp->map_lock);
1613         kref_init(&ddp->refcnt);
1614
1615         ddp->cdev = cdev;
1616         ddp->pdev = cdev->pdev;
1617         ddp->llimit = llimit;
1618         ddp->ulimit = ulimit;
1619         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1620         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1621         ddp->nppods = ppmax;
1622         ddp->idx_last = ppmax;
1623         ddp->idx_bits = bits;
1624         ddp->idx_mask = (1 << bits) - 1;
1625         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1626
1627         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1628         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1629         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1630         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1631
1632         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1633                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1634                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1635                 cdev->tag_format.rsvd_mask);
1636
1637         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1638                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1639         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1640                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1641
1642         log_debug(1 << CXGBI_DBG_DDP,
1643                 "%s max payload size: %u/%u, %u/%u.\n",
1644                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1645                 cdev->rx_max_size, ddp->max_rxsz);
1646         return 0;
1647 }
1648 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1649
1650 /*
1651  * APIs interacting with open-iscsi libraries
1652  */
1653
1654 static unsigned char padding[4];
1655
1656 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1657 {
1658         struct scsi_cmnd *sc = task->sc;
1659         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1660         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1661         struct cxgbi_hba *chba = cconn->chba;
1662         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1663         u32 tag = ntohl((__force u32)hdr_itt);
1664
1665         log_debug(1 << CXGBI_DBG_DDP,
1666                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1667         if (sc &&
1668             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1669             cxgbi_is_ddp_tag(tformat, tag))
1670                 ddp_tag_release(chba, tag);
1671 }
1672
1673 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1674 {
1675         struct scsi_cmnd *sc = task->sc;
1676         struct iscsi_conn *conn = task->conn;
1677         struct iscsi_session *sess = conn->session;
1678         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1679         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1680         struct cxgbi_hba *chba = cconn->chba;
1681         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1682         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1683         u32 tag = 0;
1684         int err = -EINVAL;
1685
1686         if (sc &&
1687             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1688                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1689                                         scsi_in(sc)->length,
1690                                         scsi_in(sc)->table.sgl,
1691                                         scsi_in(sc)->table.nents,
1692                                         GFP_ATOMIC);
1693                 if (err < 0)
1694                         log_debug(1 << CXGBI_DBG_DDP,
1695                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1696                                 cconn->cep->csk, task, scsi_in(sc)->length,
1697                                 scsi_in(sc)->table.nents);
1698         }
1699
1700         if (err < 0)
1701                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1702         /*  the itt need to sent in big-endian order */
1703         *hdr_itt = (__force itt_t)htonl(tag);
1704
1705         log_debug(1 << CXGBI_DBG_DDP,
1706                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1707                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1708         return 0;
1709 }
1710
1711 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1712 {
1713         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1714         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1715         struct cxgbi_device *cdev = cconn->chba->cdev;
1716         u32 tag = ntohl((__force u32) itt);
1717         u32 sw_bits;
1718
1719         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1720         if (idx)
1721                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1722         if (age)
1723                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1724
1725         log_debug(1 << CXGBI_DBG_DDP,
1726                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1727                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1728                 age ? *age : 0xFF);
1729 }
1730 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1731
1732 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1733 {
1734         struct iscsi_conn *conn = csk->user_data;
1735
1736         if (conn) {
1737                 log_debug(1 << CXGBI_DBG_SOCK,
1738                         "csk 0x%p, cid %d.\n", csk, conn->id);
1739                 iscsi_conn_queue_work(conn);
1740         }
1741 }
1742 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1743
1744 /*
1745  * pdu receive, interact with libiscsi_tcp
1746  */
1747 static inline int read_pdu_skb(struct iscsi_conn *conn,
1748                                struct sk_buff *skb,
1749                                unsigned int offset,
1750                                int offloaded)
1751 {
1752         int status = 0;
1753         int bytes_read;
1754
1755         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1756         switch (status) {
1757         case ISCSI_TCP_CONN_ERR:
1758                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1759                           skb, offset, offloaded);
1760                 return -EIO;
1761         case ISCSI_TCP_SUSPENDED:
1762                 log_debug(1 << CXGBI_DBG_PDU_RX,
1763                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1764                         skb, offset, offloaded, bytes_read);
1765                 /* no transfer - just have caller flush queue */
1766                 return bytes_read;
1767         case ISCSI_TCP_SKB_DONE:
1768                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1769                         skb, offset, offloaded);
1770                 /*
1771                  * pdus should always fit in the skb and we should get
1772                  * segment done notifcation.
1773                  */
1774                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1775                 return -EFAULT;
1776         case ISCSI_TCP_SEGMENT_DONE:
1777                 log_debug(1 << CXGBI_DBG_PDU_RX,
1778                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1779                         skb, offset, offloaded, bytes_read);
1780                 return bytes_read;
1781         default:
1782                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1783                         skb, offset, offloaded, status);
1784                 return -EINVAL;
1785         }
1786 }
1787
1788 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1789 {
1790         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1791
1792         log_debug(1 << CXGBI_DBG_PDU_RX,
1793                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1794                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1795
1796         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1797                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1798                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1799                 return -EIO;
1800         }
1801
1802         if (conn->hdrdgst_en &&
1803             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1804                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1805                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1806                 return -EIO;
1807         }
1808
1809         return read_pdu_skb(conn, skb, 0, 0);
1810 }
1811
1812 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1813                              struct sk_buff *skb, unsigned int offset)
1814 {
1815         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1816         bool offloaded = 0;
1817         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1818
1819         log_debug(1 << CXGBI_DBG_PDU_RX,
1820                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1821                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1822
1823         if (conn->datadgst_en &&
1824             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1825                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1826                         conn, lskb, cxgbi_skcb_flags(lskb));
1827                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1828                 return -EIO;
1829         }
1830
1831         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1832                 return 0;
1833
1834         /* coalesced, add header digest length */
1835         if (lskb == skb && conn->hdrdgst_en)
1836                 offset += ISCSI_DIGEST_SIZE;
1837
1838         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1839                 offloaded = 1;
1840
1841         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1842                 log_debug(1 << CXGBI_DBG_PDU_RX,
1843                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1844                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1845                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1846
1847         return read_pdu_skb(conn, skb, offset, offloaded);
1848 }
1849
1850 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1851 {
1852         struct cxgbi_device *cdev = csk->cdev;
1853         int must_send;
1854         u32 credits;
1855
1856         log_debug(1 << CXGBI_DBG_PDU_RX,
1857                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1858                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1859                 csk->rcv_wup, cdev->rx_credit_thres,
1860                 cdev->rcv_win);
1861
1862         if (csk->state != CTP_ESTABLISHED)
1863                 return;
1864
1865         credits = csk->copied_seq - csk->rcv_wup;
1866         if (unlikely(!credits))
1867                 return;
1868         if (unlikely(cdev->rx_credit_thres == 0))
1869                 return;
1870
1871         must_send = credits + 16384 >= cdev->rcv_win;
1872         if (must_send || credits >= cdev->rx_credit_thres)
1873                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1874 }
1875
1876 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1877 {
1878         struct cxgbi_device *cdev = csk->cdev;
1879         struct iscsi_conn *conn = csk->user_data;
1880         struct sk_buff *skb;
1881         unsigned int read = 0;
1882         int err = 0;
1883
1884         log_debug(1 << CXGBI_DBG_PDU_RX,
1885                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1886
1887         if (unlikely(!conn || conn->suspend_rx)) {
1888                 log_debug(1 << CXGBI_DBG_PDU_RX,
1889                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1890                         csk, conn, conn ? conn->id : 0xFF,
1891                         conn ? conn->suspend_rx : 0xFF);
1892                 return;
1893         }
1894
1895         while (!err) {
1896                 skb = skb_peek(&csk->receive_queue);
1897                 if (!skb ||
1898                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1899                         if (skb)
1900                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1901                                         "skb 0x%p, NOT ready 0x%lx.\n",
1902                                         skb, cxgbi_skcb_flags(skb));
1903                         break;
1904                 }
1905                 __skb_unlink(skb, &csk->receive_queue);
1906
1907                 read += cxgbi_skcb_rx_pdulen(skb);
1908                 log_debug(1 << CXGBI_DBG_PDU_RX,
1909                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1910                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1911                         cxgbi_skcb_rx_pdulen(skb));
1912
1913                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1914                         err = skb_read_pdu_bhs(conn, skb);
1915                         if (err < 0) {
1916                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1917                                         "f 0x%lx, plen %u.\n",
1918                                         csk, skb, skb->len,
1919                                         cxgbi_skcb_flags(skb),
1920                                         cxgbi_skcb_rx_pdulen(skb));
1921                                 goto skb_done;
1922                         }
1923                         err = skb_read_pdu_data(conn, skb, skb,
1924                                                 err + cdev->skb_rx_extra);
1925                         if (err < 0)
1926                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1927                                         "f 0x%lx, plen %u.\n",
1928                                         csk, skb, skb->len,
1929                                         cxgbi_skcb_flags(skb),
1930                                         cxgbi_skcb_rx_pdulen(skb));
1931                 } else {
1932                         err = skb_read_pdu_bhs(conn, skb);
1933                         if (err < 0) {
1934                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1935                                         "f 0x%lx, plen %u.\n",
1936                                         csk, skb, skb->len,
1937                                         cxgbi_skcb_flags(skb),
1938                                         cxgbi_skcb_rx_pdulen(skb));
1939                                 goto skb_done;
1940                         }
1941
1942                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1943                                 struct sk_buff *dskb;
1944
1945                                 dskb = skb_peek(&csk->receive_queue);
1946                                 if (!dskb) {
1947                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1948                                                 " plen %u, NO data.\n",
1949                                                 csk, skb, skb->len,
1950                                                 cxgbi_skcb_flags(skb),
1951                                                 cxgbi_skcb_rx_pdulen(skb));
1952                                         err = -EIO;
1953                                         goto skb_done;
1954                                 }
1955                                 __skb_unlink(dskb, &csk->receive_queue);
1956
1957                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1958                                 if (err < 0)
1959                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1960                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1961                                                 "%u.\n",
1962                                                 csk, skb, skb->len,
1963                                                 cxgbi_skcb_flags(skb),
1964                                                 cxgbi_skcb_rx_pdulen(skb),
1965                                                 dskb, dskb->len);
1966                                 __kfree_skb(dskb);
1967                         } else
1968                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1969                 }
1970 skb_done:
1971                 __kfree_skb(skb);
1972
1973                 if (err < 0)
1974                         break;
1975         }
1976
1977         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1978         if (read) {
1979                 csk->copied_seq += read;
1980                 csk_return_rx_credits(csk, read);
1981                 conn->rxdata_octets += read;
1982         }
1983
1984         if (err < 0) {
1985                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1986                         csk, conn, err, read);
1987                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1988         }
1989 }
1990 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1991
1992 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1993                                 unsigned int offset, unsigned int *off,
1994                                 struct scatterlist **sgp)
1995 {
1996         int i;
1997         struct scatterlist *sg;
1998
1999         for_each_sg(sgl, sg, sgcnt, i) {
2000                 if (offset < sg->length) {
2001                         *off = offset;
2002                         *sgp = sg;
2003                         return 0;
2004                 }
2005                 offset -= sg->length;
2006         }
2007         return -EFAULT;
2008 }
2009
2010 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
2011                                 unsigned int dlen, struct page_frag *frags,
2012                                 int frag_max)
2013 {
2014         unsigned int datalen = dlen;
2015         unsigned int sglen = sg->length - sgoffset;
2016         struct page *page = sg_page(sg);
2017         int i;
2018
2019         i = 0;
2020         do {
2021                 unsigned int copy;
2022
2023                 if (!sglen) {
2024                         sg = sg_next(sg);
2025                         if (!sg) {
2026                                 pr_warn("sg %d NULL, len %u/%u.\n",
2027                                         i, datalen, dlen);
2028                                 return -EINVAL;
2029                         }
2030                         sgoffset = 0;
2031                         sglen = sg->length;
2032                         page = sg_page(sg);
2033
2034                 }
2035                 copy = min(datalen, sglen);
2036                 if (i && page == frags[i - 1].page &&
2037                     sgoffset + sg->offset ==
2038                         frags[i - 1].offset + frags[i - 1].size) {
2039                         frags[i - 1].size += copy;
2040                 } else {
2041                         if (i >= frag_max) {
2042                                 pr_warn("too many pages %u, dlen %u.\n",
2043                                         frag_max, dlen);
2044                                 return -EINVAL;
2045                         }
2046
2047                         frags[i].page = page;
2048                         frags[i].offset = sg->offset + sgoffset;
2049                         frags[i].size = copy;
2050                         i++;
2051                 }
2052                 datalen -= copy;
2053                 sgoffset += copy;
2054                 sglen -= copy;
2055         } while (datalen);
2056
2057         return i;
2058 }
2059
2060 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2061 {
2062         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2063         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2064         struct cxgbi_device *cdev = cconn->chba->cdev;
2065         struct iscsi_conn *conn = task->conn;
2066         struct iscsi_tcp_task *tcp_task = task->dd_data;
2067         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2068         struct scsi_cmnd *sc = task->sc;
2069         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2070
2071         tcp_task->dd_data = tdata;
2072         task->hdr = NULL;
2073
2074         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2075             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2076              (opcode == ISCSI_OP_SCSI_CMD &&
2077               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2078                 /* data could goes into skb head */
2079                 headroom += min_t(unsigned int,
2080                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2081                                 conn->max_xmit_dlength);
2082
2083         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2084         if (!tdata->skb) {
2085                 struct cxgbi_sock *csk = cconn->cep->csk;
2086                 struct net_device *ndev = cdev->ports[csk->port_id];
2087                 ndev->stats.tx_dropped++;
2088                 return -ENOMEM;
2089         }
2090
2091         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2092         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2093         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2094
2095         /* data_out uses scsi_cmd's itt */
2096         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2097                 task_reserve_itt(task, &task->hdr->itt);
2098
2099         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2100                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2101                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2102                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2103
2104         return 0;
2105 }
2106 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2107
2108 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2109 {
2110         if (hcrc || dcrc) {
2111                 u8 submode = 0;
2112
2113                 if (hcrc)
2114                         submode |= 1;
2115                 if (dcrc)
2116                         submode |= 2;
2117                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2118         } else
2119                 cxgbi_skcb_ulp_mode(skb) = 0;
2120 }
2121
2122 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2123                               unsigned int count)
2124 {
2125         struct iscsi_conn *conn = task->conn;
2126         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2127         struct sk_buff *skb = tdata->skb;
2128         unsigned int datalen = count;
2129         int i, padlen = iscsi_padding(count);
2130         struct page *pg;
2131
2132         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2133                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2134                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2135                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2136
2137         skb_put(skb, task->hdr_len);
2138         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2139         if (!count)
2140                 return 0;
2141
2142         if (task->sc) {
2143                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2144                 struct scatterlist *sg = NULL;
2145                 int err;
2146
2147                 tdata->offset = offset;
2148                 tdata->count = count;
2149                 err = sgl_seek_offset(
2150                                         sdb->table.sgl, sdb->table.nents,
2151                                         tdata->offset, &tdata->sgoffset, &sg);
2152                 if (err < 0) {
2153                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2154                                 sdb->table.nents, tdata->offset, sdb->length);
2155                         return err;
2156                 }
2157                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2158                                         tdata->frags, MAX_PDU_FRAGS);
2159                 if (err < 0) {
2160                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2161                                 sdb->table.nents, tdata->offset, tdata->count);
2162                         return err;
2163                 }
2164                 tdata->nr_frags = err;
2165
2166                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2167                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2168                         char *dst = skb->data + task->hdr_len;
2169                         struct page_frag *frag = tdata->frags;
2170
2171                         /* data fits in the skb's headroom */
2172                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2173                                 char *src = kmap_atomic(frag->page);
2174
2175                                 memcpy(dst, src+frag->offset, frag->size);
2176                                 dst += frag->size;
2177                                 kunmap_atomic(src);
2178                         }
2179                         if (padlen) {
2180                                 memset(dst, 0, padlen);
2181                                 padlen = 0;
2182                         }
2183                         skb_put(skb, count + padlen);
2184                 } else {
2185                         /* data fit into frag_list */
2186                         for (i = 0; i < tdata->nr_frags; i++) {
2187                                 __skb_fill_page_desc(skb, i,
2188                                                 tdata->frags[i].page,
2189                                                 tdata->frags[i].offset,
2190                                                 tdata->frags[i].size);
2191                                 skb_frag_ref(skb, i);
2192                         }
2193                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2194                         skb->len += count;
2195                         skb->data_len += count;
2196                         skb->truesize += count;
2197                 }
2198
2199         } else {
2200                 pg = virt_to_page(task->data);
2201
2202                 get_page(pg);
2203                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2204                                         count);
2205                 skb->len += count;
2206                 skb->data_len += count;
2207                 skb->truesize += count;
2208         }
2209
2210         if (padlen) {
2211                 i = skb_shinfo(skb)->nr_frags;
2212                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2213                                 virt_to_page(padding), offset_in_page(padding),
2214                                 padlen);
2215
2216                 skb->data_len += padlen;
2217                 skb->truesize += padlen;
2218                 skb->len += padlen;
2219         }
2220
2221         return 0;
2222 }
2223 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2224
2225 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2226 {
2227         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2228         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2229         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2230         struct sk_buff *skb = tdata->skb;
2231         unsigned int datalen;
2232         int err;
2233
2234         if (!skb) {
2235                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2236                         "task 0x%p, skb NULL.\n", task);
2237                 return 0;
2238         }
2239
2240         datalen = skb->data_len;
2241         tdata->skb = NULL;
2242         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2243         if (err > 0) {
2244                 int pdulen = err;
2245
2246                 log_debug(1 << CXGBI_DBG_PDU_TX,
2247                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2248                         task, task->sc, skb, skb->len, skb->data_len, err);
2249
2250                 if (task->conn->hdrdgst_en)
2251                         pdulen += ISCSI_DIGEST_SIZE;
2252
2253                 if (datalen && task->conn->datadgst_en)
2254                         pdulen += ISCSI_DIGEST_SIZE;
2255
2256                 task->conn->txdata_octets += pdulen;
2257                 return 0;
2258         }
2259
2260         if (err == -EAGAIN || err == -ENOBUFS) {
2261                 log_debug(1 << CXGBI_DBG_PDU_TX,
2262                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2263                         task, skb, skb->len, skb->data_len, err);
2264                 /* reset skb to send when we are called again */
2265                 tdata->skb = skb;
2266                 return err;
2267         }
2268
2269         kfree_skb(skb);
2270         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2271                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2272                 task->itt, skb, skb->len, skb->data_len, err);
2273         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2274         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2275         return err;
2276 }
2277 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2278
2279 void cxgbi_cleanup_task(struct iscsi_task *task)
2280 {
2281         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2282
2283         log_debug(1 << CXGBI_DBG_ISCSI,
2284                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2285                 task, tdata->skb, task->hdr_itt);
2286
2287         /*  never reached the xmit task callout */
2288         if (tdata->skb)
2289                 __kfree_skb(tdata->skb);
2290         memset(tdata, 0, sizeof(*tdata));
2291
2292         task_release_itt(task, task->hdr_itt);
2293         iscsi_tcp_cleanup_task(task);
2294 }
2295 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2296
2297 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2298                                 struct iscsi_stats *stats)
2299 {
2300         struct iscsi_conn *conn = cls_conn->dd_data;
2301
2302         stats->txdata_octets = conn->txdata_octets;
2303         stats->rxdata_octets = conn->rxdata_octets;
2304         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2305         stats->dataout_pdus = conn->dataout_pdus_cnt;
2306         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2307         stats->datain_pdus = conn->datain_pdus_cnt;
2308         stats->r2t_pdus = conn->r2t_pdus_cnt;
2309         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2310         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2311         stats->digest_err = 0;
2312         stats->timeout_err = 0;
2313         stats->custom_length = 1;
2314         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2315         stats->custom[0].value = conn->eh_abort_cnt;
2316 }
2317 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2318
2319 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2320 {
2321         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2322         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2323         struct cxgbi_device *cdev = cconn->chba->cdev;
2324         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2325         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2326         unsigned int max = max(max_def, headroom);
2327
2328         max = min(cconn->chba->cdev->tx_max_size, max);
2329         if (conn->max_xmit_dlength)
2330                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2331         else
2332                 conn->max_xmit_dlength = max;
2333         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2334
2335         return 0;
2336 }
2337
2338 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2339 {
2340         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2341         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2342         unsigned int max = cconn->chba->cdev->rx_max_size;
2343
2344         cxgbi_align_pdu_size(max);
2345
2346         if (conn->max_recv_dlength) {
2347                 if (conn->max_recv_dlength > max) {
2348                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2349                                 conn->max_recv_dlength, max);
2350                         return -EINVAL;
2351                 }
2352                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2353                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2354         } else
2355                 conn->max_recv_dlength = max;
2356
2357         return 0;
2358 }
2359
2360 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2361                         enum iscsi_param param, char *buf, int buflen)
2362 {
2363         struct iscsi_conn *conn = cls_conn->dd_data;
2364         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2365         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2366         struct cxgbi_sock *csk = cconn->cep->csk;
2367         int err;
2368
2369         log_debug(1 << CXGBI_DBG_ISCSI,
2370                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2371                 cls_conn, param, buflen, buf);
2372
2373         switch (param) {
2374         case ISCSI_PARAM_HDRDGST_EN:
2375                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2376                 if (!err && conn->hdrdgst_en)
2377                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2378                                                         conn->hdrdgst_en,
2379                                                         conn->datadgst_en, 0);
2380                 break;
2381         case ISCSI_PARAM_DATADGST_EN:
2382                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2383                 if (!err && conn->datadgst_en)
2384                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2385                                                         conn->hdrdgst_en,
2386                                                         conn->datadgst_en, 0);
2387                 break;
2388         case ISCSI_PARAM_MAX_R2T:
2389                 return iscsi_tcp_set_max_r2t(conn, buf);
2390         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2391                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2392                 if (!err)
2393                         err = cxgbi_conn_max_recv_dlength(conn);
2394                 break;
2395         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2396                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2397                 if (!err)
2398                         err = cxgbi_conn_max_xmit_dlength(conn);
2399                 break;
2400         default:
2401                 return iscsi_set_param(cls_conn, param, buf, buflen);
2402         }
2403         return err;
2404 }
2405 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2406
2407 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2408 {
2409         int len;
2410
2411         cxgbi_sock_get(csk);
2412         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2413         cxgbi_sock_put(csk);
2414
2415         return len;
2416 }
2417
2418 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2419 {
2420         int len;
2421
2422         cxgbi_sock_get(csk);
2423         if (csk->csk_family == AF_INET)
2424                 len = sprintf(buf, "%pI4",
2425                               &csk->daddr.sin_addr.s_addr);
2426         else
2427                 len = sprintf(buf, "%pI6",
2428                               &csk->daddr6.sin6_addr);
2429
2430         cxgbi_sock_put(csk);
2431
2432         return len;
2433 }
2434
2435 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2436                        char *buf)
2437 {
2438         struct cxgbi_endpoint *cep = ep->dd_data;
2439         struct cxgbi_sock *csk;
2440         int len;
2441
2442         log_debug(1 << CXGBI_DBG_ISCSI,
2443                 "cls_conn 0x%p, param %d.\n", ep, param);
2444
2445         switch (param) {
2446         case ISCSI_PARAM_CONN_PORT:
2447         case ISCSI_PARAM_CONN_ADDRESS:
2448                 if (!cep)
2449                         return -ENOTCONN;
2450
2451                 csk = cep->csk;
2452                 if (!csk)
2453                         return -ENOTCONN;
2454
2455                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2456                                                  &csk->daddr, param, buf);
2457         default:
2458                 return -ENOSYS;
2459         }
2460         return len;
2461 }
2462 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2463
2464 struct iscsi_cls_conn *
2465 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2466 {
2467         struct iscsi_cls_conn *cls_conn;
2468         struct iscsi_conn *conn;
2469         struct iscsi_tcp_conn *tcp_conn;
2470         struct cxgbi_conn *cconn;
2471
2472         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2473         if (!cls_conn)
2474                 return NULL;
2475
2476         conn = cls_conn->dd_data;
2477         tcp_conn = conn->dd_data;
2478         cconn = tcp_conn->dd_data;
2479         cconn->iconn = conn;
2480
2481         log_debug(1 << CXGBI_DBG_ISCSI,
2482                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2483                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2484
2485         return cls_conn;
2486 }
2487 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2488
2489 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2490                                 struct iscsi_cls_conn *cls_conn,
2491                                 u64 transport_eph, int is_leading)
2492 {
2493         struct iscsi_conn *conn = cls_conn->dd_data;
2494         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2495         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2496         struct iscsi_endpoint *ep;
2497         struct cxgbi_endpoint *cep;
2498         struct cxgbi_sock *csk;
2499         int err;
2500
2501         ep = iscsi_lookup_endpoint(transport_eph);
2502         if (!ep)
2503                 return -EINVAL;
2504
2505         /*  setup ddp pagesize */
2506         cep = ep->dd_data;
2507         csk = cep->csk;
2508         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2509         if (err < 0)
2510                 return err;
2511
2512         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2513         if (err)
2514                 return -EINVAL;
2515
2516         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2517         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2518
2519         write_lock_bh(&csk->callback_lock);
2520         csk->user_data = conn;
2521         cconn->chba = cep->chba;
2522         cconn->cep = cep;
2523         cep->cconn = cconn;
2524         write_unlock_bh(&csk->callback_lock);
2525
2526         cxgbi_conn_max_xmit_dlength(conn);
2527         cxgbi_conn_max_recv_dlength(conn);
2528
2529         log_debug(1 << CXGBI_DBG_ISCSI,
2530                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2531                 cls_session, cls_conn, ep, cconn, csk);
2532         /*  init recv engine */
2533         iscsi_tcp_hdr_recv_prep(tcp_conn);
2534
2535         return 0;
2536 }
2537 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2538
2539 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2540                                                 u16 cmds_max, u16 qdepth,
2541                                                 u32 initial_cmdsn)
2542 {
2543         struct cxgbi_endpoint *cep;
2544         struct cxgbi_hba *chba;
2545         struct Scsi_Host *shost;
2546         struct iscsi_cls_session *cls_session;
2547         struct iscsi_session *session;
2548
2549         if (!ep) {
2550                 pr_err("missing endpoint.\n");
2551                 return NULL;
2552         }
2553
2554         cep = ep->dd_data;
2555         chba = cep->chba;
2556         shost = chba->shost;
2557
2558         BUG_ON(chba != iscsi_host_priv(shost));
2559
2560         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2561                                         cmds_max, 0,
2562                                         sizeof(struct iscsi_tcp_task) +
2563                                         sizeof(struct cxgbi_task_data),
2564                                         initial_cmdsn, ISCSI_MAX_TARGET);
2565         if (!cls_session)
2566                 return NULL;
2567
2568         session = cls_session->dd_data;
2569         if (iscsi_tcp_r2tpool_alloc(session))
2570                 goto remove_session;
2571
2572         log_debug(1 << CXGBI_DBG_ISCSI,
2573                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2574         return cls_session;
2575
2576 remove_session:
2577         iscsi_session_teardown(cls_session);
2578         return NULL;
2579 }
2580 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2581
2582 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2583 {
2584         log_debug(1 << CXGBI_DBG_ISCSI,
2585                 "cls sess 0x%p.\n", cls_session);
2586
2587         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2588         iscsi_session_teardown(cls_session);
2589 }
2590 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2591
2592 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2593                         char *buf, int buflen)
2594 {
2595         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2596
2597         if (!chba->ndev) {
2598                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2599                                 "netdev for host not set.\n");
2600                 return -ENODEV;
2601         }
2602
2603         log_debug(1 << CXGBI_DBG_ISCSI,
2604                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2605                 shost, chba, chba->ndev->name, param, buflen, buf);
2606
2607         switch (param) {
2608         case ISCSI_HOST_PARAM_IPADDRESS:
2609         {
2610                 __be32 addr = in_aton(buf);
2611                 log_debug(1 << CXGBI_DBG_ISCSI,
2612                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2613                 cxgbi_set_iscsi_ipv4(chba, addr);
2614                 return 0;
2615         }
2616         case ISCSI_HOST_PARAM_HWADDRESS:
2617         case ISCSI_HOST_PARAM_NETDEV_NAME:
2618                 return 0;
2619         default:
2620                 return iscsi_host_set_param(shost, param, buf, buflen);
2621         }
2622 }
2623 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2624
2625 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2626                         char *buf)
2627 {
2628         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2629         int len = 0;
2630
2631         if (!chba->ndev) {
2632                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2633                                 "netdev for host not set.\n");
2634                 return -ENODEV;
2635         }
2636
2637         log_debug(1 << CXGBI_DBG_ISCSI,
2638                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2639                 shost, chba, chba->ndev->name, param);
2640
2641         switch (param) {
2642         case ISCSI_HOST_PARAM_HWADDRESS:
2643                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2644                 break;
2645         case ISCSI_HOST_PARAM_NETDEV_NAME:
2646                 len = sprintf(buf, "%s\n", chba->ndev->name);
2647                 break;
2648         case ISCSI_HOST_PARAM_IPADDRESS:
2649         {
2650                 __be32 addr;
2651
2652                 addr = cxgbi_get_iscsi_ipv4(chba);
2653                 len = sprintf(buf, "%pI4", &addr);
2654                 log_debug(1 << CXGBI_DBG_ISCSI,
2655                         "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2656                 break;
2657         }
2658         default:
2659                 return iscsi_host_get_param(shost, param, buf);
2660         }
2661
2662         return len;
2663 }
2664 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2665
2666 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2667                                         struct sockaddr *dst_addr,
2668                                         int non_blocking)
2669 {
2670         struct iscsi_endpoint *ep;
2671         struct cxgbi_endpoint *cep;
2672         struct cxgbi_hba *hba = NULL;
2673         struct cxgbi_sock *csk;
2674         int err = -EINVAL;
2675
2676         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2677                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2678                 shost, non_blocking, dst_addr);
2679
2680         if (shost) {
2681                 hba = iscsi_host_priv(shost);
2682                 if (!hba) {
2683                         pr_info("shost 0x%p, priv NULL.\n", shost);
2684                         goto err_out;
2685                 }
2686         }
2687
2688         if (dst_addr->sa_family == AF_INET) {
2689                 csk = cxgbi_check_route(dst_addr);
2690 #if IS_ENABLED(CONFIG_IPV6)
2691         } else if (dst_addr->sa_family == AF_INET6) {
2692                 csk = cxgbi_check_route6(dst_addr);
2693 #endif
2694         } else {
2695                 pr_info("address family 0x%x NOT supported.\n",
2696                         dst_addr->sa_family);
2697                 err = -EAFNOSUPPORT;
2698                 return (struct iscsi_endpoint *)ERR_PTR(err);
2699         }
2700
2701         if (IS_ERR(csk))
2702                 return (struct iscsi_endpoint *)csk;
2703         cxgbi_sock_get(csk);
2704
2705         if (!hba)
2706                 hba = csk->cdev->hbas[csk->port_id];
2707         else if (hba != csk->cdev->hbas[csk->port_id]) {
2708                 pr_info("Could not connect through requested host %u"
2709                         "hba 0x%p != 0x%p (%u).\n",
2710                         shost->host_no, hba,
2711                         csk->cdev->hbas[csk->port_id], csk->port_id);
2712                 err = -ENOSPC;
2713                 goto release_conn;
2714         }
2715
2716         err = sock_get_port(csk);
2717         if (err)
2718                 goto release_conn;
2719
2720         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2721         err = csk->cdev->csk_init_act_open(csk);
2722         if (err)
2723                 goto release_conn;
2724
2725         if (cxgbi_sock_is_closing(csk)) {
2726                 err = -ENOSPC;
2727                 pr_info("csk 0x%p is closing.\n", csk);
2728                 goto release_conn;
2729         }
2730
2731         ep = iscsi_create_endpoint(sizeof(*cep));
2732         if (!ep) {
2733                 err = -ENOMEM;
2734                 pr_info("iscsi alloc ep, OOM.\n");
2735                 goto release_conn;
2736         }
2737
2738         cep = ep->dd_data;
2739         cep->csk = csk;
2740         cep->chba = hba;
2741
2742         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2743                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2744                 ep, cep, csk, hba, hba->ndev->name);
2745         return ep;
2746
2747 release_conn:
2748         cxgbi_sock_put(csk);
2749         cxgbi_sock_closed(csk);
2750 err_out:
2751         return ERR_PTR(err);
2752 }
2753 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2754
2755 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2756 {
2757         struct cxgbi_endpoint *cep = ep->dd_data;
2758         struct cxgbi_sock *csk = cep->csk;
2759
2760         if (!cxgbi_sock_is_established(csk))
2761                 return 0;
2762         return 1;
2763 }
2764 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2765
2766 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2767 {
2768         struct cxgbi_endpoint *cep = ep->dd_data;
2769         struct cxgbi_conn *cconn = cep->cconn;
2770         struct cxgbi_sock *csk = cep->csk;
2771
2772         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2773                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2774                 ep, cep, cconn, csk, csk->state, csk->flags);
2775
2776         if (cconn && cconn->iconn) {
2777                 iscsi_suspend_tx(cconn->iconn);
2778                 write_lock_bh(&csk->callback_lock);
2779                 cep->csk->user_data = NULL;
2780                 cconn->cep = NULL;
2781                 write_unlock_bh(&csk->callback_lock);
2782         }
2783         iscsi_destroy_endpoint(ep);
2784
2785         if (likely(csk->state >= CTP_ESTABLISHED))
2786                 need_active_close(csk);
2787         else
2788                 cxgbi_sock_closed(csk);
2789
2790         cxgbi_sock_put(csk);
2791 }
2792 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2793
2794 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2795                         struct scsi_transport_template **stt)
2796 {
2797         *stt = iscsi_register_transport(itp);
2798         if (*stt == NULL) {
2799                 pr_err("unable to register %s transport 0x%p.\n",
2800                         itp->name, itp);
2801                 return -ENODEV;
2802         }
2803         log_debug(1 << CXGBI_DBG_ISCSI,
2804                 "%s, registered iscsi transport 0x%p.\n",
2805                 itp->name, stt);
2806         return 0;
2807 }
2808 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2809
2810 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2811                         struct scsi_transport_template **stt)
2812 {
2813         if (*stt) {
2814                 log_debug(1 << CXGBI_DBG_ISCSI,
2815                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2816                         itp, itp->name, *stt);
2817                 *stt = NULL;
2818                 iscsi_unregister_transport(itp);
2819         }
2820 }
2821 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2822
2823 umode_t cxgbi_attr_is_visible(int param_type, int param)
2824 {
2825         switch (param_type) {
2826         case ISCSI_HOST_PARAM:
2827                 switch (param) {
2828                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2829                 case ISCSI_HOST_PARAM_HWADDRESS:
2830                 case ISCSI_HOST_PARAM_IPADDRESS:
2831                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2832                         return S_IRUGO;
2833                 default:
2834                         return 0;
2835                 }
2836         case ISCSI_PARAM:
2837                 switch (param) {
2838                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2839                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2840                 case ISCSI_PARAM_HDRDGST_EN:
2841                 case ISCSI_PARAM_DATADGST_EN:
2842                 case ISCSI_PARAM_CONN_ADDRESS:
2843                 case ISCSI_PARAM_CONN_PORT:
2844                 case ISCSI_PARAM_EXP_STATSN:
2845                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2846                 case ISCSI_PARAM_PERSISTENT_PORT:
2847                 case ISCSI_PARAM_PING_TMO:
2848                 case ISCSI_PARAM_RECV_TMO:
2849                 case ISCSI_PARAM_INITIAL_R2T_EN:
2850                 case ISCSI_PARAM_MAX_R2T:
2851                 case ISCSI_PARAM_IMM_DATA_EN:
2852                 case ISCSI_PARAM_FIRST_BURST:
2853                 case ISCSI_PARAM_MAX_BURST:
2854                 case ISCSI_PARAM_PDU_INORDER_EN:
2855                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2856                 case ISCSI_PARAM_ERL:
2857                 case ISCSI_PARAM_TARGET_NAME:
2858                 case ISCSI_PARAM_TPGT:
2859                 case ISCSI_PARAM_USERNAME:
2860                 case ISCSI_PARAM_PASSWORD:
2861                 case ISCSI_PARAM_USERNAME_IN:
2862                 case ISCSI_PARAM_PASSWORD_IN:
2863                 case ISCSI_PARAM_FAST_ABORT:
2864                 case ISCSI_PARAM_ABORT_TMO:
2865                 case ISCSI_PARAM_LU_RESET_TMO:
2866                 case ISCSI_PARAM_TGT_RESET_TMO:
2867                 case ISCSI_PARAM_IFACE_NAME:
2868                 case ISCSI_PARAM_INITIATOR_NAME:
2869                         return S_IRUGO;
2870                 default:
2871                         return 0;
2872                 }
2873         }
2874
2875         return 0;
2876 }
2877 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2878
2879 static int __init libcxgbi_init_module(void)
2880 {
2881         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2882         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2883
2884         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2885                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2886                 ISCSI_AGE_MASK, sw_tag_age_bits);
2887
2888         ddp_setup_host_page_size();
2889         return 0;
2890 }
2891
2892 static void __exit libcxgbi_exit_module(void)
2893 {
2894         cxgbi_device_unregister_all(0xFF);
2895         return;
2896 }
2897
2898 module_init(libcxgbi_init_module);
2899 module_exit(libcxgbi_exit_module);