drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010-2015 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      "0.9.1-ko"
  42 #define DRV_MODULE_RELDATE      "Apr. 2015"
  43
  44 static char version[] =
  45         DRV_MODULE_DESC " " DRV_MODULE_NAME
  46         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  47
  48 MODULE_AUTHOR("Chelsio Communications, Inc.");
  49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  50 MODULE_VERSION(DRV_MODULE_VERSION);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(dbg_level, uint, 0644);
  54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  55
  56
  57 /*
  58  * cxgbi device management
  59  * maintains a list of the cxgbi devices
  60  */
  61 static LIST_HEAD(cdev_list);
  62 static DEFINE_MUTEX(cdev_mutex);
  63
  64 static LIST_HEAD(cdev_rcu_list);
  65 static DEFINE_SPINLOCK(cdev_rcu_lock);
  66
  67 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  68                                 unsigned int max_conn)
  69 {
  70         struct cxgbi_ports_map *pmap = &cdev->pmap;
  71
  72         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  73                                              sizeof(struct cxgbi_sock *),
  74                                              GFP_KERNEL);
  75         if (!pmap->port_csk) {
  76                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  77                 return -ENOMEM;
  78         }
  79
  80         pmap->max_connect = max_conn;
  81         pmap->sport_base = base;
  82         spin_lock_init(&pmap->lock);
  83         return 0;
  84 }
  85 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  86
  87 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  88 {
  89         struct cxgbi_ports_map *pmap = &cdev->pmap;
  90         struct cxgbi_sock *csk;
  91         int i;
  92
  93         for (i = 0; i < pmap->max_connect; i++) {
  94                 if (pmap->port_csk[i]) {
  95                         csk = pmap->port_csk[i];
  96                         pmap->port_csk[i] = NULL;
  97                         log_debug(1 << CXGBI_DBG_SOCK,
  98                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  99                                 csk, cdev);
 100                         spin_lock_bh(&csk->lock);
 101                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
 102                         cxgbi_sock_closed(csk);
 103                         spin_unlock_bh(&csk->lock);
 104                         cxgbi_sock_put(csk);
 105                 }
 106         }
 107 }
 108 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 109
 110 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 111 {
 112         log_debug(1 << CXGBI_DBG_DEV,
 113                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 114         cxgbi_hbas_remove(cdev);
 115         cxgbi_device_portmap_cleanup(cdev);
 116         if (cdev->dev_ddp_cleanup)
 117                 cdev->dev_ddp_cleanup(cdev);
 118         else
 119                 cxgbi_ddp_cleanup(cdev);
 120         if (cdev->ddp)
 121                 cxgbi_ddp_cleanup(cdev);
 122         if (cdev->pmap.max_connect)
 123                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 124         kfree(cdev);
 125 }
 126
 127 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 128                                            unsigned int nports)
 129 {
 130         struct cxgbi_device *cdev;
 131
 132         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 133                         (sizeof(struct cxgbi_hba *) +
 134                          sizeof(struct net_device *)),
 135                         GFP_KERNEL);
 136         if (!cdev) {
 137                 pr_warn("nport %d, OOM.\n", nports);
 138                 return NULL;
 139         }
 140         cdev->ports = (struct net_device **)(cdev + 1);
 141         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 142                                                 sizeof(struct net_device *));
 143         if (extra)
 144                 cdev->dd_data = ((char *)cdev->hbas) +
 145                                 nports * sizeof(struct cxgbi_hba *);
 146         spin_lock_init(&cdev->pmap.lock);
 147
 148         mutex_lock(&cdev_mutex);
 149         list_add_tail(&cdev->list_head, &cdev_list);
 150         mutex_unlock(&cdev_mutex);
 151
 152         spin_lock(&cdev_rcu_lock);
 153         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 154         spin_unlock(&cdev_rcu_lock);
 155
 156         log_debug(1 << CXGBI_DBG_DEV,
 157                 "cdev 0x%p, p# %u.\n", cdev, nports);
 158         return cdev;
 159 }
 160 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 161
 162 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 163 {
 164         log_debug(1 << CXGBI_DBG_DEV,
 165                 "cdev 0x%p, p# %u,%s.\n",
 166                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 167
 168         mutex_lock(&cdev_mutex);
 169         list_del(&cdev->list_head);
 170         mutex_unlock(&cdev_mutex);
 171
 172         spin_lock(&cdev_rcu_lock);
 173         list_del_rcu(&cdev->rcu_node);
 174         spin_unlock(&cdev_rcu_lock);
 175         synchronize_rcu();
 176
 177         cxgbi_device_destroy(cdev);
 178 }
 179 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 180
 181 void cxgbi_device_unregister_all(unsigned int flag)
 182 {
 183         struct cxgbi_device *cdev, *tmp;
 184
 185         mutex_lock(&cdev_mutex);
 186         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 187                 if ((cdev->flags & flag) == flag) {
 188                         mutex_unlock(&cdev_mutex);
 189                         cxgbi_device_unregister(cdev);
 190                         mutex_lock(&cdev_mutex);
 191                 }
 192         }
 193         mutex_unlock(&cdev_mutex);
 194 }
 195 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 196
 197 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 198 {
 199         struct cxgbi_device *cdev, *tmp;
 200
 201         mutex_lock(&cdev_mutex);
 202         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 203                 if (cdev->lldev == lldev) {
 204                         mutex_unlock(&cdev_mutex);
 205                         return cdev;
 206                 }
 207         }
 208         mutex_unlock(&cdev_mutex);
 209
 210         log_debug(1 << CXGBI_DBG_DEV,
 211                 "lldev 0x%p, NO match found.\n", lldev);
 212         return NULL;
 213 }
 214 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 215
 216 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 217                                                  int *port)
 218 {
 219         struct net_device *vdev = NULL;
 220         struct cxgbi_device *cdev, *tmp;
 221         int i;
 222
 223         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 224                 vdev = ndev;
 225                 ndev = vlan_dev_real_dev(ndev);
 226                 log_debug(1 << CXGBI_DBG_DEV,
 227                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 228         }
 229
 230         mutex_lock(&cdev_mutex);
 231         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 232                 for (i = 0; i < cdev->nports; i++) {
 233                         if (ndev == cdev->ports[i]) {
 234                                 cdev->hbas[i]->vdev = vdev;
 235                                 mutex_unlock(&cdev_mutex);
 236                                 if (port)
 237                                         *port = i;
 238                                 return cdev;
 239                         }
 240                 }
 241         }
 242         mutex_unlock(&cdev_mutex);
 243         log_debug(1 << CXGBI_DBG_DEV,
 244                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 245         return NULL;
 246 }
 247 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 248
 249 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 250                                                      int *port)
 251 {
 252         struct net_device *vdev = NULL;
 253         struct cxgbi_device *cdev;
 254         int i;
 255
 256         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 257                 vdev = ndev;
 258                 ndev = vlan_dev_real_dev(ndev);
 259                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 260         }
 261
 262         rcu_read_lock();
 263         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 264                 for (i = 0; i < cdev->nports; i++) {
 265                         if (ndev == cdev->ports[i]) {
 266                                 cdev->hbas[i]->vdev = vdev;
 267                                 rcu_read_unlock();
 268                                 if (port)
 269                                         *port = i;
 270                                 return cdev;
 271                         }
 272                 }
 273         }
 274         rcu_read_unlock();
 275
 276         log_debug(1 << CXGBI_DBG_DEV,
 277                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 278         return NULL;
 279 }
 280 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 281
 282 #if IS_ENABLED(CONFIG_IPV6)
 283 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 284                                                      int *port)
 285 {
 286         struct net_device *vdev = NULL;
 287         struct cxgbi_device *cdev, *tmp;
 288         int i;
 289
 290         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 291                 vdev = ndev;
 292                 ndev = vlan_dev_real_dev(ndev);
 293                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 294         }
 295
 296         mutex_lock(&cdev_mutex);
 297         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 298                 for (i = 0; i < cdev->nports; i++) {
 299                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 300                                     MAX_ADDR_LEN)) {
 301                                 cdev->hbas[i]->vdev = vdev;
 302                                 mutex_unlock(&cdev_mutex);
 303                                 if (port)
 304                                         *port = i;
 305                                 return cdev;
 306                         }
 307                 }
 308         }
 309         mutex_unlock(&cdev_mutex);
 310         log_debug(1 << CXGBI_DBG_DEV,
 311                   "ndev 0x%p, %s, NO match mac found.\n",
 312                   ndev, ndev->name);
 313         return NULL;
 314 }
 315 #endif
 316
 317 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 318 {
 319         int i;
 320         struct cxgbi_hba *chba;
 321
 322         log_debug(1 << CXGBI_DBG_DEV,
 323                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 324
 325         for (i = 0; i < cdev->nports; i++) {
 326                 chba = cdev->hbas[i];
 327                 if (chba) {
 328                         cdev->hbas[i] = NULL;
 329                         iscsi_host_remove(chba->shost);
 330                         pci_dev_put(cdev->pdev);
 331                         iscsi_host_free(chba->shost);
 332                 }
 333         }
 334 }
 335 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 336
 337 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 338                 unsigned int max_id, struct scsi_host_template *sht,
 339                 struct scsi_transport_template *stt)
 340 {
 341         struct cxgbi_hba *chba;
 342         struct Scsi_Host *shost;
 343         int i, err;
 344
 345         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 346
 347         for (i = 0; i < cdev->nports; i++) {
 348                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 349                 if (!shost) {
 350                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 351                                 cdev, i, cdev->ports[i]->name);
 352                         err = -ENOMEM;
 353                         goto err_out;
 354                 }
 355
 356                 shost->transportt = stt;
 357                 shost->max_lun = max_lun;
 358                 shost->max_id = max_id;
 359                 shost->max_channel = 0;
 360                 shost->max_cmd_len = 16;
 361
 362                 chba = iscsi_host_priv(shost);
 363                 chba->cdev = cdev;
 364                 chba->ndev = cdev->ports[i];
 365                 chba->shost = shost;
 366
 367                 log_debug(1 << CXGBI_DBG_DEV,
 368                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 369                         cdev, i, cdev->ports[i]->name, chba);
 370
 371                 pci_dev_get(cdev->pdev);
 372                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 373                 if (err) {
 374                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 375                                 cdev, i, cdev->ports[i]->name);
 376                         pci_dev_put(cdev->pdev);
 377                         scsi_host_put(shost);
 378                         goto  err_out;
 379                 }
 380
 381                 cdev->hbas[i] = chba;
 382         }
 383
 384         return 0;
 385
 386 err_out:
 387         cxgbi_hbas_remove(cdev);
 388         return err;
 389 }
 390 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 391
 392 /*
 393  * iSCSI offload
 394  *
 395  * - source port management
 396  *   To find a free source port in the port allocation map we use a very simple
 397  *   rotor scheme to look for the next free port.
 398  *
 399  *   If a source port has been specified make sure that it doesn't collide with
 400  *   our normal source port allocation map.  If it's outside the range of our
 401  *   allocation/deallocation scheme just let them use it.
 402  *
 403  *   If the source port is outside our allocation range, the caller is
 404  *   responsible for keeping track of their port usage.
 405  */
 406
 407 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 408                                             unsigned char port_id)
 409 {
 410         struct cxgbi_ports_map *pmap = &cdev->pmap;
 411         unsigned int i;
 412         unsigned int used;
 413
 414         if (!pmap->max_connect || !pmap->used)
 415                 return NULL;
 416
 417         spin_lock_bh(&pmap->lock);
 418         used = pmap->used;
 419         for (i = 0; used && i < pmap->max_connect; i++) {
 420                 struct cxgbi_sock *csk = pmap->port_csk[i];
 421
 422                 if (csk) {
 423                         if (csk->port_id == port_id) {
 424                                 spin_unlock_bh(&pmap->lock);
 425                                 return csk;
 426                         }
 427                         used--;
 428                 }
 429         }
 430         spin_unlock_bh(&pmap->lock);
 431
 432         return NULL;
 433 }
 434
 435 static int sock_get_port(struct cxgbi_sock *csk)
 436 {
 437         struct cxgbi_device *cdev = csk->cdev;
 438         struct cxgbi_ports_map *pmap = &cdev->pmap;
 439         unsigned int start;
 440         int idx;
 441         __be16 *port;
 442
 443         if (!pmap->max_connect) {
 444                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 445                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 446                 return -EADDRNOTAVAIL;
 447         }
 448
 449         if (csk->csk_family == AF_INET)
 450                 port = &csk->saddr.sin_port;
 451         else /* ipv6 */
 452                 port = &csk->saddr6.sin6_port;
 453
 454         if (*port) {
 455                 pr_err("source port NON-ZERO %u.\n",
 456                         ntohs(*port));
 457                 return -EADDRINUSE;
 458         }
 459
 460         spin_lock_bh(&pmap->lock);
 461         if (pmap->used >= pmap->max_connect) {
 462                 spin_unlock_bh(&pmap->lock);
 463                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 464                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 465                 return -EADDRNOTAVAIL;
 466         }
 467
 468         start = idx = pmap->next;
 469         do {
 470                 if (++idx >= pmap->max_connect)
 471                         idx = 0;
 472                 if (!pmap->port_csk[idx]) {
 473                         pmap->used++;
 474                         *port = htons(pmap->sport_base + idx);
 475                         pmap->next = idx;
 476                         pmap->port_csk[idx] = csk;
 477                         spin_unlock_bh(&pmap->lock);
 478                         cxgbi_sock_get(csk);
 479                         log_debug(1 << CXGBI_DBG_SOCK,
 480                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 481                                 cdev, csk->port_id,
 482                                 cdev->ports[csk->port_id]->name,
 483                                 pmap->sport_base + idx, pmap->next);
 484                         return 0;
 485                 }
 486         } while (idx != start);
 487         spin_unlock_bh(&pmap->lock);
 488
 489         /* should not happen */
 490         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 491                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 492                 pmap->next);
 493         return -EADDRNOTAVAIL;
 494 }
 495
 496 static void sock_put_port(struct cxgbi_sock *csk)
 497 {
 498         struct cxgbi_device *cdev = csk->cdev;
 499         struct cxgbi_ports_map *pmap = &cdev->pmap;
 500         __be16 *port;
 501
 502         if (csk->csk_family == AF_INET)
 503                 port = &csk->saddr.sin_port;
 504         else /* ipv6 */
 505                 port = &csk->saddr6.sin6_port;
 506
 507         if (*port) {
 508                 int idx = ntohs(*port) - pmap->sport_base;
 509
 510                 *port = 0;
 511                 if (idx < 0 || idx >= pmap->max_connect) {
 512                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 513                                 cdev, csk->port_id,
 514                                 cdev->ports[csk->port_id]->name,
 515                                 ntohs(*port));
 516                         return;
 517                 }
 518
 519                 spin_lock_bh(&pmap->lock);
 520                 pmap->port_csk[idx] = NULL;
 521                 pmap->used--;
 522                 spin_unlock_bh(&pmap->lock);
 523
 524                 log_debug(1 << CXGBI_DBG_SOCK,
 525                         "cdev 0x%p, p#%u %s, release %u.\n",
 526                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 527                         pmap->sport_base + idx);
 528
 529                 cxgbi_sock_put(csk);
 530         }
 531 }
 532
 533 /*
 534  * iscsi tcp connection
 535  */
 536 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 537 {
 538         if (csk->cpl_close) {
 539                 kfree_skb(csk->cpl_close);
 540                 csk->cpl_close = NULL;
 541         }
 542         if (csk->cpl_abort_req) {
 543                 kfree_skb(csk->cpl_abort_req);
 544                 csk->cpl_abort_req = NULL;
 545         }
 546         if (csk->cpl_abort_rpl) {
 547                 kfree_skb(csk->cpl_abort_rpl);
 548                 csk->cpl_abort_rpl = NULL;
 549         }
 550 }
 551 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 552
 553 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 554 {
 555         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 556
 557         if (!csk) {
 558                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 559                 return NULL;
 560         }
 561
 562         if (cdev->csk_alloc_cpls(csk) < 0) {
 563                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 564                 kfree(csk);
 565                 return NULL;
 566         }
 567
 568         spin_lock_init(&csk->lock);
 569         kref_init(&csk->refcnt);
 570         skb_queue_head_init(&csk->receive_queue);
 571         skb_queue_head_init(&csk->write_queue);
 572         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 573         rwlock_init(&csk->callback_lock);
 574         csk->cdev = cdev;
 575         csk->flags = 0;
 576         cxgbi_sock_set_state(csk, CTP_CLOSED);
 577
 578         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 579
 580         return csk;
 581 }
 582
 583 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 584                                       __be32 saddr, __be32 daddr,
 585                                       __be16 sport, __be16 dport, u8 tos)
 586 {
 587         struct rtable *rt;
 588
 589         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 590                                    dport, sport, IPPROTO_TCP, tos, 0);
 591         if (IS_ERR(rt))
 592                 return NULL;
 593
 594         return rt;
 595 }
 596
 597 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 598 {
 599         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 600         struct dst_entry *dst;
 601         struct net_device *ndev;
 602         struct cxgbi_device *cdev;
 603         struct rtable *rt = NULL;
 604         struct neighbour *n;
 605         struct flowi4 fl4;
 606         struct cxgbi_sock *csk = NULL;
 607         unsigned int mtu = 0;
 608         int port = 0xFFFF;
 609         int err = 0;
 610
 611         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 612         if (!rt) {
 613                 pr_info("no route to ipv4 0x%x, port %u.\n",
 614                         be32_to_cpu(daddr->sin_addr.s_addr),
 615                         be16_to_cpu(daddr->sin_port));
 616                 err = -ENETUNREACH;
 617                 goto err_out;
 618         }
 619         dst = &rt->dst;
 620         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 621         if (!n) {
 622                 err = -ENODEV;
 623                 goto rel_rt;
 624         }
 625         ndev = n->dev;
 626
 627         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 628                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 629                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 630                         ndev->name);
 631                 err = -ENETUNREACH;
 632                 goto rel_neigh;
 633         }
 634
 635         if (ndev->flags & IFF_LOOPBACK) {
 636                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 637                 if (!ndev) {
 638                         err = -ENETUNREACH;
 639                         goto rel_neigh;
 640                 }
 641                 mtu = ndev->mtu;
 642                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 643                         n->dev->name, ndev->name, mtu);
 644         }
 645
 646         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 647         if (!cdev) {
 648                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 649                         &daddr->sin_addr.s_addr, ndev->name);
 650                 err = -ENETUNREACH;
 651                 goto rel_neigh;
 652         }
 653         log_debug(1 << CXGBI_DBG_SOCK,
 654                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 655                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 656                            port, ndev->name, cdev);
 657
 658         csk = cxgbi_sock_create(cdev);
 659         if (!csk) {
 660                 err = -ENOMEM;
 661                 goto rel_neigh;
 662         }
 663         csk->cdev = cdev;
 664         csk->port_id = port;
 665         csk->mtu = mtu;
 666         csk->dst = dst;
 667
 668         csk->csk_family = AF_INET;
 669         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 670         csk->daddr.sin_port = daddr->sin_port;
 671         csk->daddr.sin_family = daddr->sin_family;
 672         csk->saddr.sin_family = daddr->sin_family;
 673         csk->saddr.sin_addr.s_addr = fl4.saddr;
 674         neigh_release(n);
 675
 676         return csk;
 677
 678 rel_neigh:
 679         neigh_release(n);
 680
 681 rel_rt:
 682         ip_rt_put(rt);
 683         if (csk)
 684                 cxgbi_sock_closed(csk);
 685 err_out:
 686         return ERR_PTR(err);
 687 }
 688
 689 #if IS_ENABLED(CONFIG_IPV6)
 690 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 691                                         const struct in6_addr *daddr)
 692 {
 693         struct flowi6 fl;
 694
 695         memset(&fl, 0, sizeof(fl));
 696         if (saddr)
 697                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 698         if (daddr)
 699                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 700         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 701 }
 702
 703 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 704 {
 705         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 706         struct dst_entry *dst;
 707         struct net_device *ndev;
 708         struct cxgbi_device *cdev;
 709         struct rt6_info *rt = NULL;
 710         struct neighbour *n;
 711         struct in6_addr pref_saddr;
 712         struct cxgbi_sock *csk = NULL;
 713         unsigned int mtu = 0;
 714         int port = 0xFFFF;
 715         int err = 0;
 716
 717         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 718
 719         if (!rt) {
 720                 pr_info("no route to ipv6 %pI6 port %u\n",
 721                         daddr6->sin6_addr.s6_addr,
 722                         be16_to_cpu(daddr6->sin6_port));
 723                 err = -ENETUNREACH;
 724                 goto err_out;
 725         }
 726
 727         dst = &rt->dst;
 728
 729         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 730
 731         if (!n) {
 732                 pr_info("%pI6, port %u, dst no neighbour.\n",
 733                         daddr6->sin6_addr.s6_addr,
 734                         be16_to_cpu(daddr6->sin6_port));
 735                 err = -ENETUNREACH;
 736                 goto rel_rt;
 737         }
 738         ndev = n->dev;
 739
 740         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 741                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 742                         daddr6->sin6_addr.s6_addr,
 743                         ntohs(daddr6->sin6_port), ndev->name);
 744                 err = -ENETUNREACH;
 745                 goto rel_rt;
 746         }
 747
 748         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 749         if (!cdev)
 750                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 751         if (!cdev) {
 752                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 753                         daddr6->sin6_addr.s6_addr, ndev->name);
 754                 err = -ENETUNREACH;
 755                 goto rel_rt;
 756         }
 757         log_debug(1 << CXGBI_DBG_SOCK,
 758                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 759                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 760                   ndev->name, cdev);
 761
 762         csk = cxgbi_sock_create(cdev);
 763         if (!csk) {
 764                 err = -ENOMEM;
 765                 goto rel_rt;
 766         }
 767         csk->cdev = cdev;
 768         csk->port_id = port;
 769         csk->mtu = mtu;
 770         csk->dst = dst;
 771
 772         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 773                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 774
 775                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 776                                          &daddr6->sin6_addr, 0, &pref_saddr);
 777                 if (err) {
 778                         pr_info("failed to get source address to reach %pI6\n",
 779                                 &daddr6->sin6_addr);
 780                         goto rel_rt;
 781                 }
 782         } else {
 783                 pref_saddr = rt->rt6i_prefsrc.addr;
 784         }
 785
 786         csk->csk_family = AF_INET6;
 787         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 788         csk->daddr6.sin6_port = daddr6->sin6_port;
 789         csk->daddr6.sin6_family = daddr6->sin6_family;
 790         csk->saddr6.sin6_family = daddr6->sin6_family;
 791         csk->saddr6.sin6_addr = pref_saddr;
 792
 793         neigh_release(n);
 794         return csk;
 795
 796 rel_rt:
 797         if (n)
 798                 neigh_release(n);
 799
 800         ip6_rt_put(rt);
 801         if (csk)
 802                 cxgbi_sock_closed(csk);
 803 err_out:
 804         return ERR_PTR(err);
 805 }
 806 #endif /* IS_ENABLED(CONFIG_IPV6) */
 807
 808 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 809                         unsigned int opt)
 810 {
 811         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 812         dst_confirm(csk->dst);
 813         smp_mb();
 814         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 815 }
 816 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 817
 818 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 819 {
 820         log_debug(1 << CXGBI_DBG_SOCK,
 821                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 822                 csk, csk->state, csk->flags, csk->user_data);
 823
 824         if (csk->state != CTP_ESTABLISHED) {
 825                 read_lock_bh(&csk->callback_lock);
 826                 if (csk->user_data)
 827                         iscsi_conn_failure(csk->user_data,
 828                                         ISCSI_ERR_TCP_CONN_CLOSE);
 829                 read_unlock_bh(&csk->callback_lock);
 830         }
 831 }
 832
 833 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 834 {
 835         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 836                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 837         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 838         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 839                 return;
 840         if (csk->saddr.sin_port)
 841                 sock_put_port(csk);
 842         if (csk->dst)
 843                 dst_release(csk->dst);
 844         csk->cdev->csk_release_offload_resources(csk);
 845         cxgbi_sock_set_state(csk, CTP_CLOSED);
 846         cxgbi_inform_iscsi_conn_closing(csk);
 847         cxgbi_sock_put(csk);
 848 }
 849 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 850
 851 static void need_active_close(struct cxgbi_sock *csk)
 852 {
 853         int data_lost;
 854         int close_req = 0;
 855
 856         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 857                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 858         spin_lock_bh(&csk->lock);
 859         dst_confirm(csk->dst);
 860         data_lost = skb_queue_len(&csk->receive_queue);
 861         __skb_queue_purge(&csk->receive_queue);
 862
 863         if (csk->state == CTP_ACTIVE_OPEN)
 864                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 865         else if (csk->state == CTP_ESTABLISHED) {
 866                 close_req = 1;
 867                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 868         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 869                 close_req = 1;
 870                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 871         }
 872
 873         if (close_req) {
 874                 if (data_lost)
 875                         csk->cdev->csk_send_abort_req(csk);
 876                 else
 877                         csk->cdev->csk_send_close_req(csk);
 878         }
 879
 880         spin_unlock_bh(&csk->lock);
 881 }
 882
 883 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 884 {
 885         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 886                         csk, csk->state, csk->flags,
 887                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 888                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 889                         errno);
 890
 891         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 892         csk->err = errno;
 893         cxgbi_sock_closed(csk);
 894 }
 895 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 896
 897 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 898 {
 899         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 900
 901         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 902                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 903         cxgbi_sock_get(csk);
 904         spin_lock_bh(&csk->lock);
 905         if (csk->state == CTP_ACTIVE_OPEN)
 906                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 907         spin_unlock_bh(&csk->lock);
 908         cxgbi_sock_put(csk);
 909         __kfree_skb(skb);
 910 }
 911 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 912
 913 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 914 {
 915         cxgbi_sock_get(csk);
 916         spin_lock_bh(&csk->lock);
 917
 918         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 919         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 920                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 921                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 922                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 923                                csk, csk->state, csk->flags, csk->tid);
 924                 cxgbi_sock_closed(csk);
 925         }
 926
 927         spin_unlock_bh(&csk->lock);
 928         cxgbi_sock_put(csk);
 929 }
 930 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 931
 932 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 933 {
 934         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 935                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 936         cxgbi_sock_get(csk);
 937         spin_lock_bh(&csk->lock);
 938
 939         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 940                 goto done;
 941
 942         switch (csk->state) {
 943         case CTP_ESTABLISHED:
 944                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 945                 break;
 946         case CTP_ACTIVE_CLOSE:
 947                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 948                 break;
 949         case CTP_CLOSE_WAIT_1:
 950                 cxgbi_sock_closed(csk);
 951                 break;
 952         case CTP_ABORTING:
 953                 break;
 954         default:
 955                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 956                         csk, csk->state, csk->flags, csk->tid);
 957         }
 958         cxgbi_inform_iscsi_conn_closing(csk);
 959 done:
 960         spin_unlock_bh(&csk->lock);
 961         cxgbi_sock_put(csk);
 962 }
 963 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 964
 965 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 966 {
 967         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 968                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 969         cxgbi_sock_get(csk);
 970         spin_lock_bh(&csk->lock);
 971
 972         csk->snd_una = snd_nxt - 1;
 973         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 974                 goto done;
 975
 976         switch (csk->state) {
 977         case CTP_ACTIVE_CLOSE:
 978                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 979                 break;
 980         case CTP_CLOSE_WAIT_1:
 981         case CTP_CLOSE_WAIT_2:
 982                 cxgbi_sock_closed(csk);
 983                 break;
 984         case CTP_ABORTING:
 985                 break;
 986         default:
 987                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 988                         csk, csk->state, csk->flags, csk->tid);
 989         }
 990 done:
 991         spin_unlock_bh(&csk->lock);
 992         cxgbi_sock_put(csk);
 993 }
 994 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 995
 996 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 997                            unsigned int snd_una, int seq_chk)
 998 {
 999         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1000                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1001                         csk, csk->state, csk->flags, csk->tid, credits,
1002                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1003
1004         spin_lock_bh(&csk->lock);
1005
1006         csk->wr_cred += credits;
1007         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1008                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1009
1010         while (credits) {
1011                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1012
1013                 if (unlikely(!p)) {
1014                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1015                                 csk, csk->state, csk->flags, csk->tid, credits,
1016                                 csk->wr_cred, csk->wr_una_cred);
1017                         break;
1018                 }
1019
1020                 if (unlikely(credits < p->csum)) {
1021                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1022                                 csk, csk->state, csk->flags, csk->tid,
1023                                 credits, csk->wr_cred, csk->wr_una_cred,
1024                                 p->csum);
1025                         p->csum -= credits;
1026                         break;
1027                 } else {
1028                         cxgbi_sock_dequeue_wr(csk);
1029                         credits -= p->csum;
1030                         kfree_skb(p);
1031                 }
1032         }
1033
1034         cxgbi_sock_check_wr_invariants(csk);
1035
1036         if (seq_chk) {
1037                 if (unlikely(before(snd_una, csk->snd_una))) {
1038                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1039                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1040                                 csk->snd_una);
1041                         goto done;
1042                 }
1043
1044                 if (csk->snd_una != snd_una) {
1045                         csk->snd_una = snd_una;
1046                         dst_confirm(csk->dst);
1047                 }
1048         }
1049
1050         if (skb_queue_len(&csk->write_queue)) {
1051                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1052                         cxgbi_conn_tx_open(csk);
1053         } else
1054                 cxgbi_conn_tx_open(csk);
1055 done:
1056         spin_unlock_bh(&csk->lock);
1057 }
1058 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1059
1060 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1061                                              unsigned short mtu)
1062 {
1063         int i = 0;
1064
1065         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1066                 ++i;
1067
1068         return i;
1069 }
1070
1071 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1072 {
1073         unsigned int idx;
1074         struct dst_entry *dst = csk->dst;
1075
1076         csk->advmss = dst_metric_advmss(dst);
1077
1078         if (csk->advmss > pmtu - 40)
1079                 csk->advmss = pmtu - 40;
1080         if (csk->advmss < csk->cdev->mtus[0] - 40)
1081                 csk->advmss = csk->cdev->mtus[0] - 40;
1082         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1083
1084         return idx;
1085 }
1086 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1087
1088 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1089 {
1090         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1091         __skb_queue_tail(&csk->write_queue, skb);
1092 }
1093 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1094
1095 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1096 {
1097         struct sk_buff *skb;
1098
1099         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1100                 kfree_skb(skb);
1101 }
1102 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1103
1104 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1105 {
1106         int pending = cxgbi_sock_count_pending_wrs(csk);
1107
1108         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1109                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1110                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1111 }
1112 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1113
1114 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1115 {
1116         struct cxgbi_device *cdev = csk->cdev;
1117         struct sk_buff *next;
1118         int err, copied = 0;
1119
1120         spin_lock_bh(&csk->lock);
1121
1122         if (csk->state != CTP_ESTABLISHED) {
1123                 log_debug(1 << CXGBI_DBG_PDU_TX,
1124                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1125                         csk, csk->state, csk->flags, csk->tid);
1126                 err = -EAGAIN;
1127                 goto out_err;
1128         }
1129
1130         if (csk->err) {
1131                 log_debug(1 << CXGBI_DBG_PDU_TX,
1132                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1133                         csk, csk->state, csk->flags, csk->tid, csk->err);
1134                 err = -EPIPE;
1135                 goto out_err;
1136         }
1137
1138         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1139                 log_debug(1 << CXGBI_DBG_PDU_TX,
1140                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1141                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1142                         csk->snd_una, csk->snd_win);
1143                 err = -ENOBUFS;
1144                 goto out_err;
1145         }
1146
1147         while (skb) {
1148                 int frags = skb_shinfo(skb)->nr_frags +
1149                                 (skb->len != skb->data_len);
1150
1151                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1152                         pr_err("csk 0x%p, skb head %u < %u.\n",
1153                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1154                         err = -EINVAL;
1155                         goto out_err;
1156                 }
1157
1158                 if (frags >= SKB_WR_LIST_SIZE) {
1159                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1160                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1161                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1162                         err = -EINVAL;
1163                         goto out_err;
1164                 }
1165
1166                 next = skb->next;
1167                 skb->next = NULL;
1168                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1169                 cxgbi_sock_skb_entail(csk, skb);
1170                 copied += skb->len;
1171                 csk->write_seq += skb->len +
1172                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1173                 skb = next;
1174         }
1175 done:
1176         if (likely(skb_queue_len(&csk->write_queue)))
1177                 cdev->csk_push_tx_frames(csk, 1);
1178         spin_unlock_bh(&csk->lock);
1179         return copied;
1180
1181 out_err:
1182         if (copied == 0 && err == -EPIPE)
1183                 copied = csk->err ? csk->err : -EPIPE;
1184         else
1185                 copied = err;
1186         goto done;
1187 }
1188
1189 /*
1190  * Direct Data Placement -
1191  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1192  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1193  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1194  * The host memory address is programmed into h/w in the format of pagepod
1195  * entries.
1196  * The location of the pagepod entry is encoded into ddp tag which is used as
1197  * the base for ITT/TTT.
1198  */
1199
1200 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1201 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1202 static unsigned char page_idx = DDP_PGIDX_MAX;
1203
1204 static unsigned char sw_tag_idx_bits;
1205 static unsigned char sw_tag_age_bits;
1206
1207 /*
1208  * Direct-Data Placement page size adjustment
1209  */
1210 static int ddp_adjust_page_table(void)
1211 {
1212         int i;
1213         unsigned int base_order, order;
1214
1215         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1216                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1217                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
1218                 return -EINVAL;
1219         }
1220
1221         base_order = get_order(1UL << ddp_page_shift[0]);
1222         order = get_order(1UL << PAGE_SHIFT);
1223
1224         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1225                 /* first is the kernel page size, then just doubling */
1226                 ddp_page_order[i] = order - base_order + i;
1227                 ddp_page_shift[i] = PAGE_SHIFT + i;
1228         }
1229         return 0;
1230 }
1231
1232 static int ddp_find_page_index(unsigned long pgsz)
1233 {
1234         int i;
1235
1236         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1237                 if (pgsz == (1UL << ddp_page_shift[i]))
1238                         return i;
1239         }
1240         pr_info("ddp page size %lu not supported.\n", pgsz);
1241         return DDP_PGIDX_MAX;
1242 }
1243
1244 static void ddp_setup_host_page_size(void)
1245 {
1246         if (page_idx == DDP_PGIDX_MAX) {
1247                 page_idx = ddp_find_page_index(PAGE_SIZE);
1248
1249                 if (page_idx == DDP_PGIDX_MAX) {
1250                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1251                         if (ddp_adjust_page_table() < 0) {
1252                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1253                                 return;
1254                         }
1255                         page_idx = ddp_find_page_index(PAGE_SIZE);
1256                 }
1257                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1258         }
1259 }
1260
1261 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1262 {
1263         int i;
1264
1265         for (i = 0; i < DDP_PGIDX_MAX; i++)
1266                 pgsz_factor[i] = ddp_page_order[i];
1267 }
1268 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1269
1270 /*
1271  * DDP setup & teardown
1272  */
1273
1274 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1275                         struct cxgbi_pagepod_hdr *hdr,
1276                         struct cxgbi_gather_list *gl, unsigned int gidx)
1277 {
1278         int i;
1279
1280         memcpy(ppod, hdr, sizeof(*hdr));
1281         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1282                 ppod->addr[i] = gidx < gl->nelem ?
1283                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1284         }
1285 }
1286 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1287
1288 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1289 {
1290         memset(ppod, 0, sizeof(*ppod));
1291 }
1292 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1293
1294 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1295                                         unsigned int start, unsigned int max,
1296                                         unsigned int count,
1297                                         struct cxgbi_gather_list *gl)
1298 {
1299         unsigned int i, j, k;
1300
1301         /*  not enough entries */
1302         if ((max - start) < count) {
1303                 log_debug(1 << CXGBI_DBG_DDP,
1304                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1305                 return -EBUSY;
1306         }
1307
1308         max -= count;
1309         spin_lock(&ddp->map_lock);
1310         for (i = start; i < max;) {
1311                 for (j = 0, k = i; j < count; j++, k++) {
1312                         if (ddp->gl_map[k])
1313                                 break;
1314                 }
1315                 if (j == count) {
1316                         for (j = 0, k = i; j < count; j++, k++)
1317                                 ddp->gl_map[k] = gl;
1318                         spin_unlock(&ddp->map_lock);
1319                         return i;
1320                 }
1321                 i += j + 1;
1322         }
1323         spin_unlock(&ddp->map_lock);
1324         log_debug(1 << CXGBI_DBG_DDP,
1325                 "NO suitable entries %u available.\n", count);
1326         return -EBUSY;
1327 }
1328
1329 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1330                                                 int start, int count)
1331 {
1332         spin_lock(&ddp->map_lock);
1333         memset(&ddp->gl_map[start], 0,
1334                 count * sizeof(struct cxgbi_gather_list *));
1335         spin_unlock(&ddp->map_lock);
1336 }
1337
1338 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1339                                         struct cxgbi_gather_list *gl)
1340 {
1341         int i;
1342
1343         for (i = 0; i < gl->nelem; i++)
1344                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1345                                 PCI_DMA_FROMDEVICE);
1346 }
1347
1348 static inline int ddp_gl_map(struct pci_dev *pdev,
1349                                     struct cxgbi_gather_list *gl)
1350 {
1351         int i;
1352
1353         for (i = 0; i < gl->nelem; i++) {
1354                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1355                                                 PAGE_SIZE,
1356                                                 PCI_DMA_FROMDEVICE);
1357                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1358                         log_debug(1 << CXGBI_DBG_DDP,
1359                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1360                                 i, gl->pages[i], pdev);
1361                         goto unmap;
1362                 }
1363         }
1364         return i;
1365 unmap:
1366         if (i) {
1367                 unsigned int nelem = gl->nelem;
1368
1369                 gl->nelem = i;
1370                 ddp_gl_unmap(pdev, gl);
1371                 gl->nelem = nelem;
1372         }
1373         return -EINVAL;
1374 }
1375
1376 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1377                                   struct pci_dev *pdev)
1378 {
1379         ddp_gl_unmap(pdev, gl);
1380         kfree(gl);
1381 }
1382
1383 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1384                                                     struct scatterlist *sgl,
1385                                                     unsigned int sgcnt,
1386                                                     struct pci_dev *pdev,
1387                                                     gfp_t gfp)
1388 {
1389         struct cxgbi_gather_list *gl;
1390         struct scatterlist *sg = sgl;
1391         struct page *sgpage = sg_page(sg);
1392         unsigned int sglen = sg->length;
1393         unsigned int sgoffset = sg->offset;
1394         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1395                                 PAGE_SHIFT;
1396         int i = 1, j = 0;
1397
1398         if (xferlen < DDP_THRESHOLD) {
1399                 log_debug(1 << CXGBI_DBG_DDP,
1400                         "xfer %u < threshold %u, no ddp.\n",
1401                         xferlen, DDP_THRESHOLD);
1402                 return NULL;
1403         }
1404
1405         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1406                      npages * (sizeof(dma_addr_t) +
1407                      sizeof(struct page *)), gfp);
1408         if (!gl) {
1409                 log_debug(1 << CXGBI_DBG_DDP,
1410                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1411                 return NULL;
1412         }
1413
1414          log_debug(1 << CXGBI_DBG_DDP,
1415                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1416
1417         gl->pages = (struct page **)&gl->phys_addr[npages];
1418         gl->nelem = npages;
1419         gl->length = xferlen;
1420         gl->offset = sgoffset;
1421         gl->pages[0] = sgpage;
1422
1423         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1424                 i++, sg = sg_next(sg)) {
1425                 struct page *page = sg_page(sg);
1426
1427                 if (sgpage == page && sg->offset == sgoffset + sglen)
1428                         sglen += sg->length;
1429                 else {
1430                         /*  make sure the sgl is fit for ddp:
1431                          *  each has the same page size, and
1432                          *  all of the middle pages are used completely
1433                          */
1434                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1435                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1436                                 log_debug(1 << CXGBI_DBG_DDP,
1437                                         "page %d/%u, %u + %u.\n",
1438                                         i, sgcnt, sgoffset, sglen);
1439                                 goto error_out;
1440                         }
1441
1442                         j++;
1443                         if (j == gl->nelem || sg->offset) {
1444                                 log_debug(1 << CXGBI_DBG_DDP,
1445                                         "page %d/%u, offset %u.\n",
1446                                         j, gl->nelem, sg->offset);
1447                                 goto error_out;
1448                         }
1449                         gl->pages[j] = page;
1450                         sglen = sg->length;
1451                         sgoffset = sg->offset;
1452                         sgpage = page;
1453                 }
1454         }
1455         gl->nelem = ++j;
1456
1457         if (ddp_gl_map(pdev, gl) < 0)
1458                 goto error_out;
1459
1460         return gl;
1461
1462 error_out:
1463         kfree(gl);
1464         return NULL;
1465 }
1466
1467 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1468 {
1469         struct cxgbi_device *cdev = chba->cdev;
1470         struct cxgbi_ddp_info *ddp = cdev->ddp;
1471         u32 idx;
1472
1473         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1474         if (idx < ddp->nppods) {
1475                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1476                 unsigned int npods;
1477
1478                 if (!gl || !gl->nelem) {
1479                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1480                                 tag, idx, gl, gl ? gl->nelem : 0);
1481                         return;
1482                 }
1483                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1484                 log_debug(1 << CXGBI_DBG_DDP,
1485                         "tag 0x%x, release idx %u, npods %u.\n",
1486                         tag, idx, npods);
1487                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1488                 ddp_unmark_entries(ddp, idx, npods);
1489                 ddp_release_gl(gl, ddp->pdev);
1490         } else
1491                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1492 }
1493
1494 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1495                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1496                            gfp_t gfp)
1497 {
1498         struct cxgbi_device *cdev = csk->cdev;
1499         struct cxgbi_ddp_info *ddp = cdev->ddp;
1500         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1501         struct cxgbi_pagepod_hdr hdr;
1502         unsigned int npods;
1503         int idx = -1;
1504         int err = -ENOMEM;
1505         u32 tag;
1506
1507         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1508         if (ddp->idx_last == ddp->nppods)
1509                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1510                                                         npods, gl);
1511         else {
1512                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1513                                                         ddp->nppods, npods,
1514                                                         gl);
1515                 if (idx < 0 && ddp->idx_last >= npods) {
1516                         idx = ddp_find_unused_entries(ddp, 0,
1517                                 min(ddp->idx_last + npods, ddp->nppods),
1518                                                         npods, gl);
1519                 }
1520         }
1521         if (idx < 0) {
1522                 log_debug(1 << CXGBI_DBG_DDP,
1523                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1524                         gl->length, gl->nelem, npods);
1525                 return idx;
1526         }
1527
1528         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1529         tag |= idx << PPOD_IDX_SHIFT;
1530
1531         hdr.rsvd = 0;
1532         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1533         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1534         hdr.max_offset = htonl(gl->length);
1535         hdr.page_offset = htonl(gl->offset);
1536
1537         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1538         if (err < 0)
1539                 goto unmark_entries;
1540
1541         ddp->idx_last = idx;
1542         log_debug(1 << CXGBI_DBG_DDP,
1543                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1544                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1545                 npods);
1546         *tagp = tag;
1547         return 0;
1548
1549 unmark_entries:
1550         ddp_unmark_entries(ddp, idx, npods);
1551         return err;
1552 }
1553
1554 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1555                         unsigned int sw_tag, unsigned int xferlen,
1556                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1557 {
1558         struct cxgbi_device *cdev = csk->cdev;
1559         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1560         struct cxgbi_gather_list *gl;
1561         int err;
1562
1563         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1564             xferlen < DDP_THRESHOLD) {
1565                 log_debug(1 << CXGBI_DBG_DDP,
1566                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1567                 return -EINVAL;
1568         }
1569
1570         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1571                 log_debug(1 << CXGBI_DBG_DDP,
1572                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1573                 return -EINVAL;
1574         }
1575
1576         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1577         if (!gl)
1578                 return -ENOMEM;
1579
1580         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1581         if (err < 0)
1582                 ddp_release_gl(gl, cdev->pdev);
1583
1584         return err;
1585 }
1586
1587 static void ddp_destroy(struct kref *kref)
1588 {
1589         struct cxgbi_ddp_info *ddp = container_of(kref,
1590                                                 struct cxgbi_ddp_info,
1591                                                 refcnt);
1592         struct cxgbi_device *cdev = ddp->cdev;
1593         int i = 0;
1594
1595         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1596
1597         while (i < ddp->nppods) {
1598                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1599
1600                 if (gl) {
1601                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1602                                         >> PPOD_PAGES_SHIFT;
1603                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1604                         kfree(gl);
1605                         i += npods;
1606                 } else
1607                         i++;
1608         }
1609         cxgbi_free_big_mem(ddp);
1610 }
1611
1612 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1613 {
1614         struct cxgbi_ddp_info *ddp = cdev->ddp;
1615
1616         log_debug(1 << CXGBI_DBG_DDP,
1617                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1618         cdev->ddp = NULL;
1619         if (ddp)
1620                 return kref_put(&ddp->refcnt, ddp_destroy);
1621         return 0;
1622 }
1623 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1624
1625 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1626                    unsigned int llimit, unsigned int ulimit,
1627                    unsigned int max_txsz, unsigned int max_rxsz)
1628 {
1629         struct cxgbi_ddp_info *ddp;
1630         unsigned int ppmax, bits;
1631
1632         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1633         bits = __ilog2_u32(ppmax) + 1;
1634         if (bits > PPOD_IDX_MAX_SIZE)
1635                 bits = PPOD_IDX_MAX_SIZE;
1636         ppmax = (1 << (bits - 1)) - 1;
1637
1638         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1639                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1640                                          sizeof(struct sk_buff *)),
1641                                 GFP_KERNEL);
1642         if (!ddp) {
1643                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1644                 return -ENOMEM;
1645         }
1646         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1647         cdev->ddp = ddp;
1648
1649         spin_lock_init(&ddp->map_lock);
1650         kref_init(&ddp->refcnt);
1651
1652         ddp->cdev = cdev;
1653         ddp->pdev = cdev->pdev;
1654         ddp->llimit = llimit;
1655         ddp->ulimit = ulimit;
1656         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1657         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1658         ddp->nppods = ppmax;
1659         ddp->idx_last = ppmax;
1660         ddp->idx_bits = bits;
1661         ddp->idx_mask = (1 << bits) - 1;
1662         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1663
1664         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1665         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1666         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1667         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1668
1669         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1670                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1671                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1672                 cdev->tag_format.rsvd_mask);
1673
1674         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1675                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1676         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1677                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1678
1679         log_debug(1 << CXGBI_DBG_DDP,
1680                 "%s max payload size: %u/%u, %u/%u.\n",
1681                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1682                 cdev->rx_max_size, ddp->max_rxsz);
1683         return 0;
1684 }
1685 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1686
1687 /*
1688  * APIs interacting with open-iscsi libraries
1689  */
1690
1691 static unsigned char padding[4];
1692
1693 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1694 {
1695         struct scsi_cmnd *sc = task->sc;
1696         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1697         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1698         struct cxgbi_hba *chba = cconn->chba;
1699         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1700         u32 tag = ntohl((__force u32)hdr_itt);
1701
1702         log_debug(1 << CXGBI_DBG_DDP,
1703                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1704         if (sc &&
1705             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1706             cxgbi_is_ddp_tag(tformat, tag))
1707                 ddp_tag_release(chba, tag);
1708 }
1709
1710 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1711 {
1712         struct scsi_cmnd *sc = task->sc;
1713         struct iscsi_conn *conn = task->conn;
1714         struct iscsi_session *sess = conn->session;
1715         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1716         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1717         struct cxgbi_hba *chba = cconn->chba;
1718         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1719         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1720         u32 tag = 0;
1721         int err = -EINVAL;
1722
1723         if (sc &&
1724             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1725                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1726                                         scsi_in(sc)->length,
1727                                         scsi_in(sc)->table.sgl,
1728                                         scsi_in(sc)->table.nents,
1729                                         GFP_ATOMIC);
1730                 if (err < 0)
1731                         log_debug(1 << CXGBI_DBG_DDP,
1732                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1733                                 cconn->cep->csk, task, scsi_in(sc)->length,
1734                                 scsi_in(sc)->table.nents);
1735         }
1736
1737         if (err < 0)
1738                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1739         /*  the itt need to sent in big-endian order */
1740         *hdr_itt = (__force itt_t)htonl(tag);
1741
1742         log_debug(1 << CXGBI_DBG_DDP,
1743                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1744                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1745         return 0;
1746 }
1747
1748 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1749 {
1750         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1751         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1752         struct cxgbi_device *cdev = cconn->chba->cdev;
1753         u32 tag = ntohl((__force u32) itt);
1754         u32 sw_bits;
1755
1756         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1757         if (idx)
1758                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1759         if (age)
1760                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1761
1762         log_debug(1 << CXGBI_DBG_DDP,
1763                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1764                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1765                 age ? *age : 0xFF);
1766 }
1767 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1768
1769 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1770 {
1771         struct iscsi_conn *conn = csk->user_data;
1772
1773         if (conn) {
1774                 log_debug(1 << CXGBI_DBG_SOCK,
1775                         "csk 0x%p, cid %d.\n", csk, conn->id);
1776                 iscsi_conn_queue_work(conn);
1777         }
1778 }
1779 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1780
1781 /*
1782  * pdu receive, interact with libiscsi_tcp
1783  */
1784 static inline int read_pdu_skb(struct iscsi_conn *conn,
1785                                struct sk_buff *skb,
1786                                unsigned int offset,
1787                                int offloaded)
1788 {
1789         int status = 0;
1790         int bytes_read;
1791
1792         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1793         switch (status) {
1794         case ISCSI_TCP_CONN_ERR:
1795                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1796                           skb, offset, offloaded);
1797                 return -EIO;
1798         case ISCSI_TCP_SUSPENDED:
1799                 log_debug(1 << CXGBI_DBG_PDU_RX,
1800                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1801                         skb, offset, offloaded, bytes_read);
1802                 /* no transfer - just have caller flush queue */
1803                 return bytes_read;
1804         case ISCSI_TCP_SKB_DONE:
1805                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1806                         skb, offset, offloaded);
1807                 /*
1808                  * pdus should always fit in the skb and we should get
1809                  * segment done notifcation.
1810                  */
1811                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1812                 return -EFAULT;
1813         case ISCSI_TCP_SEGMENT_DONE:
1814                 log_debug(1 << CXGBI_DBG_PDU_RX,
1815                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1816                         skb, offset, offloaded, bytes_read);
1817                 return bytes_read;
1818         default:
1819                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1820                         skb, offset, offloaded, status);
1821                 return -EINVAL;
1822         }
1823 }
1824
1825 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1826 {
1827         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1828
1829         log_debug(1 << CXGBI_DBG_PDU_RX,
1830                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1831                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1832
1833         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1834                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1835                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1836                 return -EIO;
1837         }
1838
1839         if (conn->hdrdgst_en &&
1840             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1841                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1842                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1843                 return -EIO;
1844         }
1845
1846         return read_pdu_skb(conn, skb, 0, 0);
1847 }
1848
1849 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1850                              struct sk_buff *skb, unsigned int offset)
1851 {
1852         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1853         bool offloaded = 0;
1854         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1855
1856         log_debug(1 << CXGBI_DBG_PDU_RX,
1857                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1858                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1859
1860         if (conn->datadgst_en &&
1861             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1862                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1863                         conn, lskb, cxgbi_skcb_flags(lskb));
1864                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1865                 return -EIO;
1866         }
1867
1868         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1869                 return 0;
1870
1871         /* coalesced, add header digest length */
1872         if (lskb == skb && conn->hdrdgst_en)
1873                 offset += ISCSI_DIGEST_SIZE;
1874
1875         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1876                 offloaded = 1;
1877
1878         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1879                 log_debug(1 << CXGBI_DBG_PDU_RX,
1880                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1881                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1882                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1883
1884         return read_pdu_skb(conn, skb, offset, offloaded);
1885 }
1886
1887 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1888 {
1889         struct cxgbi_device *cdev = csk->cdev;
1890         int must_send;
1891         u32 credits;
1892
1893         log_debug(1 << CXGBI_DBG_PDU_RX,
1894                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1895                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1896                 csk->rcv_wup, cdev->rx_credit_thres,
1897                 csk->rcv_win);
1898
1899         if (csk->state != CTP_ESTABLISHED)
1900                 return;
1901
1902         credits = csk->copied_seq - csk->rcv_wup;
1903         if (unlikely(!credits))
1904                 return;
1905         if (unlikely(cdev->rx_credit_thres == 0))
1906                 return;
1907
1908         must_send = credits + 16384 >= csk->rcv_win;
1909         if (must_send || credits >= cdev->rx_credit_thres)
1910                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1911 }
1912
1913 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1914 {
1915         struct cxgbi_device *cdev = csk->cdev;
1916         struct iscsi_conn *conn = csk->user_data;
1917         struct sk_buff *skb;
1918         unsigned int read = 0;
1919         int err = 0;
1920
1921         log_debug(1 << CXGBI_DBG_PDU_RX,
1922                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1923
1924         if (unlikely(!conn || conn->suspend_rx)) {
1925                 log_debug(1 << CXGBI_DBG_PDU_RX,
1926                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1927                         csk, conn, conn ? conn->id : 0xFF,
1928                         conn ? conn->suspend_rx : 0xFF);
1929                 return;
1930         }
1931
1932         while (!err) {
1933                 skb = skb_peek(&csk->receive_queue);
1934                 if (!skb ||
1935                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1936                         if (skb)
1937                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1938                                         "skb 0x%p, NOT ready 0x%lx.\n",
1939                                         skb, cxgbi_skcb_flags(skb));
1940                         break;
1941                 }
1942                 __skb_unlink(skb, &csk->receive_queue);
1943
1944                 read += cxgbi_skcb_rx_pdulen(skb);
1945                 log_debug(1 << CXGBI_DBG_PDU_RX,
1946                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1947                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1948                         cxgbi_skcb_rx_pdulen(skb));
1949
1950                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1951                         err = skb_read_pdu_bhs(conn, skb);
1952                         if (err < 0) {
1953                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1954                                         "f 0x%lx, plen %u.\n",
1955                                         csk, skb, skb->len,
1956                                         cxgbi_skcb_flags(skb),
1957                                         cxgbi_skcb_rx_pdulen(skb));
1958                                 goto skb_done;
1959                         }
1960                         err = skb_read_pdu_data(conn, skb, skb,
1961                                                 err + cdev->skb_rx_extra);
1962                         if (err < 0)
1963                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1964                                         "f 0x%lx, plen %u.\n",
1965                                         csk, skb, skb->len,
1966                                         cxgbi_skcb_flags(skb),
1967                                         cxgbi_skcb_rx_pdulen(skb));
1968                 } else {
1969                         err = skb_read_pdu_bhs(conn, skb);
1970                         if (err < 0) {
1971                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1972                                         "f 0x%lx, plen %u.\n",
1973                                         csk, skb, skb->len,
1974                                         cxgbi_skcb_flags(skb),
1975                                         cxgbi_skcb_rx_pdulen(skb));
1976                                 goto skb_done;
1977                         }
1978
1979                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1980                                 struct sk_buff *dskb;
1981
1982                                 dskb = skb_peek(&csk->receive_queue);
1983                                 if (!dskb) {
1984                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1985                                                 " plen %u, NO data.\n",
1986                                                 csk, skb, skb->len,
1987                                                 cxgbi_skcb_flags(skb),
1988                                                 cxgbi_skcb_rx_pdulen(skb));
1989                                         err = -EIO;
1990                                         goto skb_done;
1991                                 }
1992                                 __skb_unlink(dskb, &csk->receive_queue);
1993
1994                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1995                                 if (err < 0)
1996                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1997                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1998                                                 "%u.\n",
1999                                                 csk, skb, skb->len,
2000                                                 cxgbi_skcb_flags(skb),
2001                                                 cxgbi_skcb_rx_pdulen(skb),
2002                                                 dskb, dskb->len);
2003                                 __kfree_skb(dskb);
2004                         } else
2005                                 err = skb_read_pdu_data(conn, skb, skb, 0);
2006                 }
2007 skb_done:
2008                 __kfree_skb(skb);
2009
2010                 if (err < 0)
2011                         break;
2012         }
2013
2014         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
2015         if (read) {
2016                 csk->copied_seq += read;
2017                 csk_return_rx_credits(csk, read);
2018                 conn->rxdata_octets += read;
2019         }
2020
2021         if (err < 0) {
2022                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
2023                         csk, conn, err, read);
2024                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2025         }
2026 }
2027 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
2028
2029 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
2030                                 unsigned int offset, unsigned int *off,
2031                                 struct scatterlist **sgp)
2032 {
2033         int i;
2034         struct scatterlist *sg;
2035
2036         for_each_sg(sgl, sg, sgcnt, i) {
2037                 if (offset < sg->length) {
2038                         *off = offset;
2039                         *sgp = sg;
2040                         return 0;
2041                 }
2042                 offset -= sg->length;
2043         }
2044         return -EFAULT;
2045 }
2046
2047 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
2048                                 unsigned int dlen, struct page_frag *frags,
2049                                 int frag_max)
2050 {
2051         unsigned int datalen = dlen;
2052         unsigned int sglen = sg->length - sgoffset;
2053         struct page *page = sg_page(sg);
2054         int i;
2055
2056         i = 0;
2057         do {
2058                 unsigned int copy;
2059
2060                 if (!sglen) {
2061                         sg = sg_next(sg);
2062                         if (!sg) {
2063                                 pr_warn("sg %d NULL, len %u/%u.\n",
2064                                         i, datalen, dlen);
2065                                 return -EINVAL;
2066                         }
2067                         sgoffset = 0;
2068                         sglen = sg->length;
2069                         page = sg_page(sg);
2070
2071                 }
2072                 copy = min(datalen, sglen);
2073                 if (i && page == frags[i - 1].page &&
2074                     sgoffset + sg->offset ==
2075                         frags[i - 1].offset + frags[i - 1].size) {
2076                         frags[i - 1].size += copy;
2077                 } else {
2078                         if (i >= frag_max) {
2079                                 pr_warn("too many pages %u, dlen %u.\n",
2080                                         frag_max, dlen);
2081                                 return -EINVAL;
2082                         }
2083
2084                         frags[i].page = page;
2085                         frags[i].offset = sg->offset + sgoffset;
2086                         frags[i].size = copy;
2087                         i++;
2088                 }
2089                 datalen -= copy;
2090                 sgoffset += copy;
2091                 sglen -= copy;
2092         } while (datalen);
2093
2094         return i;
2095 }
2096
2097 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2098 {
2099         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2100         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2101         struct cxgbi_device *cdev = cconn->chba->cdev;
2102         struct iscsi_conn *conn = task->conn;
2103         struct iscsi_tcp_task *tcp_task = task->dd_data;
2104         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2105         struct scsi_cmnd *sc = task->sc;
2106         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2107
2108         tcp_task->dd_data = tdata;
2109         task->hdr = NULL;
2110
2111         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2112             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2113              (opcode == ISCSI_OP_SCSI_CMD &&
2114               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2115                 /* data could goes into skb head */
2116                 headroom += min_t(unsigned int,
2117                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2118                                 conn->max_xmit_dlength);
2119
2120         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2121         if (!tdata->skb) {
2122                 struct cxgbi_sock *csk = cconn->cep->csk;
2123                 struct net_device *ndev = cdev->ports[csk->port_id];
2124                 ndev->stats.tx_dropped++;
2125                 return -ENOMEM;
2126         }
2127
2128         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2129         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2130         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2131
2132         /* data_out uses scsi_cmd's itt */
2133         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2134                 task_reserve_itt(task, &task->hdr->itt);
2135
2136         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2137                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2138                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2139                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2140
2141         return 0;
2142 }
2143 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2144
2145 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2146 {
2147         if (hcrc || dcrc) {
2148                 u8 submode = 0;
2149
2150                 if (hcrc)
2151                         submode |= 1;
2152                 if (dcrc)
2153                         submode |= 2;
2154                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2155         } else
2156                 cxgbi_skcb_ulp_mode(skb) = 0;
2157 }
2158
2159 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2160                               unsigned int count)
2161 {
2162         struct iscsi_conn *conn = task->conn;
2163         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2164         struct sk_buff *skb = tdata->skb;
2165         unsigned int datalen = count;
2166         int i, padlen = iscsi_padding(count);
2167         struct page *pg;
2168
2169         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2170                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2171                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2172                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2173
2174         skb_put(skb, task->hdr_len);
2175         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2176         if (!count)
2177                 return 0;
2178
2179         if (task->sc) {
2180                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2181                 struct scatterlist *sg = NULL;
2182                 int err;
2183
2184                 tdata->offset = offset;
2185                 tdata->count = count;
2186                 err = sgl_seek_offset(
2187                                         sdb->table.sgl, sdb->table.nents,
2188                                         tdata->offset, &tdata->sgoffset, &sg);
2189                 if (err < 0) {
2190                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2191                                 sdb->table.nents, tdata->offset, sdb->length);
2192                         return err;
2193                 }
2194                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2195                                         tdata->frags, MAX_PDU_FRAGS);
2196                 if (err < 0) {
2197                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2198                                 sdb->table.nents, tdata->offset, tdata->count);
2199                         return err;
2200                 }
2201                 tdata->nr_frags = err;
2202
2203                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2204                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2205                         char *dst = skb->data + task->hdr_len;
2206                         struct page_frag *frag = tdata->frags;
2207
2208                         /* data fits in the skb's headroom */
2209                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2210                                 char *src = kmap_atomic(frag->page);
2211
2212                                 memcpy(dst, src+frag->offset, frag->size);
2213                                 dst += frag->size;
2214                                 kunmap_atomic(src);
2215                         }
2216                         if (padlen) {
2217                                 memset(dst, 0, padlen);
2218                                 padlen = 0;
2219                         }
2220                         skb_put(skb, count + padlen);
2221                 } else {
2222                         /* data fit into frag_list */
2223                         for (i = 0; i < tdata->nr_frags; i++) {
2224                                 __skb_fill_page_desc(skb, i,
2225                                                 tdata->frags[i].page,
2226                                                 tdata->frags[i].offset,
2227                                                 tdata->frags[i].size);
2228                                 skb_frag_ref(skb, i);
2229                         }
2230                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2231                         skb->len += count;
2232                         skb->data_len += count;
2233                         skb->truesize += count;
2234                 }
2235
2236         } else {
2237                 pg = virt_to_page(task->data);
2238
2239                 get_page(pg);
2240                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2241                                         count);
2242                 skb->len += count;
2243                 skb->data_len += count;
2244                 skb->truesize += count;
2245         }
2246
2247         if (padlen) {
2248                 i = skb_shinfo(skb)->nr_frags;
2249                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2250                                 virt_to_page(padding), offset_in_page(padding),
2251                                 padlen);
2252
2253                 skb->data_len += padlen;
2254                 skb->truesize += padlen;
2255                 skb->len += padlen;
2256         }
2257
2258         return 0;
2259 }
2260 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2261
2262 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2263 {
2264         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2265         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2266         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2267         struct sk_buff *skb = tdata->skb;
2268         unsigned int datalen;
2269         int err;
2270
2271         if (!skb) {
2272                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2273                         "task 0x%p, skb NULL.\n", task);
2274                 return 0;
2275         }
2276
2277         datalen = skb->data_len;
2278         tdata->skb = NULL;
2279         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2280         if (err > 0) {
2281                 int pdulen = err;
2282
2283                 log_debug(1 << CXGBI_DBG_PDU_TX,
2284                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2285                         task, task->sc, skb, skb->len, skb->data_len, err);
2286
2287                 if (task->conn->hdrdgst_en)
2288                         pdulen += ISCSI_DIGEST_SIZE;
2289
2290                 if (datalen && task->conn->datadgst_en)
2291                         pdulen += ISCSI_DIGEST_SIZE;
2292
2293                 task->conn->txdata_octets += pdulen;
2294                 return 0;
2295         }
2296
2297         if (err == -EAGAIN || err == -ENOBUFS) {
2298                 log_debug(1 << CXGBI_DBG_PDU_TX,
2299                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2300                         task, skb, skb->len, skb->data_len, err);
2301                 /* reset skb to send when we are called again */
2302                 tdata->skb = skb;
2303                 return err;
2304         }
2305
2306         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2307                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2308                 task->itt, skb, skb->len, skb->data_len, err);
2309
2310         kfree_skb(skb);
2311
2312         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2313         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2314         return err;
2315 }
2316 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2317
2318 void cxgbi_cleanup_task(struct iscsi_task *task)
2319 {
2320         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2321
2322         log_debug(1 << CXGBI_DBG_ISCSI,
2323                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2324                 task, tdata->skb, task->hdr_itt);
2325
2326         /*  never reached the xmit task callout */
2327         if (tdata->skb)
2328                 __kfree_skb(tdata->skb);
2329         memset(tdata, 0, sizeof(*tdata));
2330
2331         task_release_itt(task, task->hdr_itt);
2332         iscsi_tcp_cleanup_task(task);
2333 }
2334 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2335
2336 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2337                                 struct iscsi_stats *stats)
2338 {
2339         struct iscsi_conn *conn = cls_conn->dd_data;
2340
2341         stats->txdata_octets = conn->txdata_octets;
2342         stats->rxdata_octets = conn->rxdata_octets;
2343         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2344         stats->dataout_pdus = conn->dataout_pdus_cnt;
2345         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2346         stats->datain_pdus = conn->datain_pdus_cnt;
2347         stats->r2t_pdus = conn->r2t_pdus_cnt;
2348         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2349         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2350         stats->digest_err = 0;
2351         stats->timeout_err = 0;
2352         stats->custom_length = 1;
2353         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2354         stats->custom[0].value = conn->eh_abort_cnt;
2355 }
2356 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2357
2358 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2359 {
2360         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2361         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2362         struct cxgbi_device *cdev = cconn->chba->cdev;
2363         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2364         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2365         unsigned int max = max(max_def, headroom);
2366
2367         max = min(cconn->chba->cdev->tx_max_size, max);
2368         if (conn->max_xmit_dlength)
2369                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2370         else
2371                 conn->max_xmit_dlength = max;
2372         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2373
2374         return 0;
2375 }
2376
2377 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2378 {
2379         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2380         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2381         unsigned int max = cconn->chba->cdev->rx_max_size;
2382
2383         cxgbi_align_pdu_size(max);
2384
2385         if (conn->max_recv_dlength) {
2386                 if (conn->max_recv_dlength > max) {
2387                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2388                                 conn->max_recv_dlength, max);
2389                         return -EINVAL;
2390                 }
2391                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2392                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2393         } else
2394                 conn->max_recv_dlength = max;
2395
2396         return 0;
2397 }
2398
2399 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2400                         enum iscsi_param param, char *buf, int buflen)
2401 {
2402         struct iscsi_conn *conn = cls_conn->dd_data;
2403         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2404         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2405         struct cxgbi_sock *csk = cconn->cep->csk;
2406         int err;
2407
2408         log_debug(1 << CXGBI_DBG_ISCSI,
2409                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2410                 cls_conn, param, buflen, buf);
2411
2412         switch (param) {
2413         case ISCSI_PARAM_HDRDGST_EN:
2414                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2415                 if (!err && conn->hdrdgst_en)
2416                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2417                                                         conn->hdrdgst_en,
2418                                                         conn->datadgst_en, 0);
2419                 break;
2420         case ISCSI_PARAM_DATADGST_EN:
2421                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2422                 if (!err && conn->datadgst_en)
2423                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2424                                                         conn->hdrdgst_en,
2425                                                         conn->datadgst_en, 0);
2426                 break;
2427         case ISCSI_PARAM_MAX_R2T:
2428                 return iscsi_tcp_set_max_r2t(conn, buf);
2429         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2430                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2431                 if (!err)
2432                         err = cxgbi_conn_max_recv_dlength(conn);
2433                 break;
2434         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2435                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2436                 if (!err)
2437                         err = cxgbi_conn_max_xmit_dlength(conn);
2438                 break;
2439         default:
2440                 return iscsi_set_param(cls_conn, param, buf, buflen);
2441         }
2442         return err;
2443 }
2444 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2445
2446 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2447 {
2448         int len;
2449
2450         cxgbi_sock_get(csk);
2451         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2452         cxgbi_sock_put(csk);
2453
2454         return len;
2455 }
2456
2457 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2458 {
2459         int len;
2460
2461         cxgbi_sock_get(csk);
2462         if (csk->csk_family == AF_INET)
2463                 len = sprintf(buf, "%pI4",
2464                               &csk->daddr.sin_addr.s_addr);
2465         else
2466                 len = sprintf(buf, "%pI6",
2467                               &csk->daddr6.sin6_addr);
2468
2469         cxgbi_sock_put(csk);
2470
2471         return len;
2472 }
2473
2474 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2475                        char *buf)
2476 {
2477         struct cxgbi_endpoint *cep = ep->dd_data;
2478         struct cxgbi_sock *csk;
2479         int len;
2480
2481         log_debug(1 << CXGBI_DBG_ISCSI,
2482                 "cls_conn 0x%p, param %d.\n", ep, param);
2483
2484         switch (param) {
2485         case ISCSI_PARAM_CONN_PORT:
2486         case ISCSI_PARAM_CONN_ADDRESS:
2487                 if (!cep)
2488                         return -ENOTCONN;
2489
2490                 csk = cep->csk;
2491                 if (!csk)
2492                         return -ENOTCONN;
2493
2494                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2495                                                  &csk->daddr, param, buf);
2496         default:
2497                 return -ENOSYS;
2498         }
2499         return len;
2500 }
2501 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2502
2503 struct iscsi_cls_conn *
2504 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2505 {
2506         struct iscsi_cls_conn *cls_conn;
2507         struct iscsi_conn *conn;
2508         struct iscsi_tcp_conn *tcp_conn;
2509         struct cxgbi_conn *cconn;
2510
2511         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2512         if (!cls_conn)
2513                 return NULL;
2514
2515         conn = cls_conn->dd_data;
2516         tcp_conn = conn->dd_data;
2517         cconn = tcp_conn->dd_data;
2518         cconn->iconn = conn;
2519
2520         log_debug(1 << CXGBI_DBG_ISCSI,
2521                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2522                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2523
2524         return cls_conn;
2525 }
2526 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2527
2528 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2529                                 struct iscsi_cls_conn *cls_conn,
2530                                 u64 transport_eph, int is_leading)
2531 {
2532         struct iscsi_conn *conn = cls_conn->dd_data;
2533         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2534         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2535         struct iscsi_endpoint *ep;
2536         struct cxgbi_endpoint *cep;
2537         struct cxgbi_sock *csk;
2538         int err;
2539
2540         ep = iscsi_lookup_endpoint(transport_eph);
2541         if (!ep)
2542                 return -EINVAL;
2543
2544         /*  setup ddp pagesize */
2545         cep = ep->dd_data;
2546         csk = cep->csk;
2547         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2548         if (err < 0)
2549                 return err;
2550
2551         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2552         if (err)
2553                 return -EINVAL;
2554
2555         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2556         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2557
2558         write_lock_bh(&csk->callback_lock);
2559         csk->user_data = conn;
2560         cconn->chba = cep->chba;
2561         cconn->cep = cep;
2562         cep->cconn = cconn;
2563         write_unlock_bh(&csk->callback_lock);
2564
2565         cxgbi_conn_max_xmit_dlength(conn);
2566         cxgbi_conn_max_recv_dlength(conn);
2567
2568         log_debug(1 << CXGBI_DBG_ISCSI,
2569                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2570                 cls_session, cls_conn, ep, cconn, csk);
2571         /*  init recv engine */
2572         iscsi_tcp_hdr_recv_prep(tcp_conn);
2573
2574         return 0;
2575 }
2576 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2577
2578 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2579                                                 u16 cmds_max, u16 qdepth,
2580                                                 u32 initial_cmdsn)
2581 {
2582         struct cxgbi_endpoint *cep;
2583         struct cxgbi_hba *chba;
2584         struct Scsi_Host *shost;
2585         struct iscsi_cls_session *cls_session;
2586         struct iscsi_session *session;
2587
2588         if (!ep) {
2589                 pr_err("missing endpoint.\n");
2590                 return NULL;
2591         }
2592
2593         cep = ep->dd_data;
2594         chba = cep->chba;
2595         shost = chba->shost;
2596
2597         BUG_ON(chba != iscsi_host_priv(shost));
2598
2599         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2600                                         cmds_max, 0,
2601                                         sizeof(struct iscsi_tcp_task) +
2602                                         sizeof(struct cxgbi_task_data),
2603                                         initial_cmdsn, ISCSI_MAX_TARGET);
2604         if (!cls_session)
2605                 return NULL;
2606
2607         session = cls_session->dd_data;
2608         if (iscsi_tcp_r2tpool_alloc(session))
2609                 goto remove_session;
2610
2611         log_debug(1 << CXGBI_DBG_ISCSI,
2612                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2613         return cls_session;
2614
2615 remove_session:
2616         iscsi_session_teardown(cls_session);
2617         return NULL;
2618 }
2619 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2620
2621 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2622 {
2623         log_debug(1 << CXGBI_DBG_ISCSI,
2624                 "cls sess 0x%p.\n", cls_session);
2625
2626         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2627         iscsi_session_teardown(cls_session);
2628 }
2629 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2630
2631 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2632                         char *buf, int buflen)
2633 {
2634         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2635
2636         if (!chba->ndev) {
2637                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2638                                 "netdev for host not set.\n");
2639                 return -ENODEV;
2640         }
2641
2642         log_debug(1 << CXGBI_DBG_ISCSI,
2643                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2644                 shost, chba, chba->ndev->name, param, buflen, buf);
2645
2646         switch (param) {
2647         case ISCSI_HOST_PARAM_IPADDRESS:
2648         {
2649                 __be32 addr = in_aton(buf);
2650                 log_debug(1 << CXGBI_DBG_ISCSI,
2651                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2652                 cxgbi_set_iscsi_ipv4(chba, addr);
2653                 return 0;
2654         }
2655         case ISCSI_HOST_PARAM_HWADDRESS:
2656         case ISCSI_HOST_PARAM_NETDEV_NAME:
2657                 return 0;
2658         default:
2659                 return iscsi_host_set_param(shost, param, buf, buflen);
2660         }
2661 }
2662 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2663
2664 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2665                         char *buf)
2666 {
2667         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2668         int len = 0;
2669
2670         if (!chba->ndev) {
2671                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2672                                 "netdev for host not set.\n");
2673                 return -ENODEV;
2674         }
2675
2676         log_debug(1 << CXGBI_DBG_ISCSI,
2677                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2678                 shost, chba, chba->ndev->name, param);
2679
2680         switch (param) {
2681         case ISCSI_HOST_PARAM_HWADDRESS:
2682                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2683                 break;
2684         case ISCSI_HOST_PARAM_NETDEV_NAME:
2685                 len = sprintf(buf, "%s\n", chba->ndev->name);
2686                 break;
2687         case ISCSI_HOST_PARAM_IPADDRESS:
2688         {
2689                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2690                                                            chba->port_id);
2691                 if (csk) {
2692                         len = sprintf(buf, "%pIS",
2693                                       (struct sockaddr *)&csk->saddr);
2694                 }
2695                 log_debug(1 << CXGBI_DBG_ISCSI,
2696                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2697                 break;
2698         }
2699         default:
2700                 return iscsi_host_get_param(shost, param, buf);
2701         }
2702
2703         return len;
2704 }
2705 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2706
2707 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2708                                         struct sockaddr *dst_addr,
2709                                         int non_blocking)
2710 {
2711         struct iscsi_endpoint *ep;
2712         struct cxgbi_endpoint *cep;
2713         struct cxgbi_hba *hba = NULL;
2714         struct cxgbi_sock *csk;
2715         int err = -EINVAL;
2716
2717         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2718                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2719                 shost, non_blocking, dst_addr);
2720
2721         if (shost) {
2722                 hba = iscsi_host_priv(shost);
2723                 if (!hba) {
2724                         pr_info("shost 0x%p, priv NULL.\n", shost);
2725                         goto err_out;
2726                 }
2727         }
2728
2729         if (dst_addr->sa_family == AF_INET) {
2730                 csk = cxgbi_check_route(dst_addr);
2731 #if IS_ENABLED(CONFIG_IPV6)
2732         } else if (dst_addr->sa_family == AF_INET6) {
2733                 csk = cxgbi_check_route6(dst_addr);
2734 #endif
2735         } else {
2736                 pr_info("address family 0x%x NOT supported.\n",
2737                         dst_addr->sa_family);
2738                 err = -EAFNOSUPPORT;
2739                 return (struct iscsi_endpoint *)ERR_PTR(err);
2740         }
2741
2742         if (IS_ERR(csk))
2743                 return (struct iscsi_endpoint *)csk;
2744         cxgbi_sock_get(csk);
2745
2746         if (!hba)
2747                 hba = csk->cdev->hbas[csk->port_id];
2748         else if (hba != csk->cdev->hbas[csk->port_id]) {
2749                 pr_info("Could not connect through requested host %u"
2750                         "hba 0x%p != 0x%p (%u).\n",
2751                         shost->host_no, hba,
2752                         csk->cdev->hbas[csk->port_id], csk->port_id);
2753                 err = -ENOSPC;
2754                 goto release_conn;
2755         }
2756
2757         err = sock_get_port(csk);
2758         if (err)
2759                 goto release_conn;
2760
2761         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2762         err = csk->cdev->csk_init_act_open(csk);
2763         if (err)
2764                 goto release_conn;
2765
2766         if (cxgbi_sock_is_closing(csk)) {
2767                 err = -ENOSPC;
2768                 pr_info("csk 0x%p is closing.\n", csk);
2769                 goto release_conn;
2770         }
2771
2772         ep = iscsi_create_endpoint(sizeof(*cep));
2773         if (!ep) {
2774                 err = -ENOMEM;
2775                 pr_info("iscsi alloc ep, OOM.\n");
2776                 goto release_conn;
2777         }
2778
2779         cep = ep->dd_data;
2780         cep->csk = csk;
2781         cep->chba = hba;
2782
2783         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2784                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2785                 ep, cep, csk, hba, hba->ndev->name);
2786         return ep;
2787
2788 release_conn:
2789         cxgbi_sock_put(csk);
2790         cxgbi_sock_closed(csk);
2791 err_out:
2792         return ERR_PTR(err);
2793 }
2794 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2795
2796 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2797 {
2798         struct cxgbi_endpoint *cep = ep->dd_data;
2799         struct cxgbi_sock *csk = cep->csk;
2800
2801         if (!cxgbi_sock_is_established(csk))
2802                 return 0;
2803         return 1;
2804 }
2805 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2806
2807 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2808 {
2809         struct cxgbi_endpoint *cep = ep->dd_data;
2810         struct cxgbi_conn *cconn = cep->cconn;
2811         struct cxgbi_sock *csk = cep->csk;
2812
2813         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2814                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2815                 ep, cep, cconn, csk, csk->state, csk->flags);
2816
2817         if (cconn && cconn->iconn) {
2818                 iscsi_suspend_tx(cconn->iconn);
2819                 write_lock_bh(&csk->callback_lock);
2820                 cep->csk->user_data = NULL;
2821                 cconn->cep = NULL;
2822                 write_unlock_bh(&csk->callback_lock);
2823         }
2824         iscsi_destroy_endpoint(ep);
2825
2826         if (likely(csk->state >= CTP_ESTABLISHED))
2827                 need_active_close(csk);
2828         else
2829                 cxgbi_sock_closed(csk);
2830
2831         cxgbi_sock_put(csk);
2832 }
2833 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2834
2835 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2836                         struct scsi_transport_template **stt)
2837 {
2838         *stt = iscsi_register_transport(itp);
2839         if (*stt == NULL) {
2840                 pr_err("unable to register %s transport 0x%p.\n",
2841                         itp->name, itp);
2842                 return -ENODEV;
2843         }
2844         log_debug(1 << CXGBI_DBG_ISCSI,
2845                 "%s, registered iscsi transport 0x%p.\n",
2846                 itp->name, stt);
2847         return 0;
2848 }
2849 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2850
2851 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2852                         struct scsi_transport_template **stt)
2853 {
2854         if (*stt) {
2855                 log_debug(1 << CXGBI_DBG_ISCSI,
2856                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2857                         itp, itp->name, *stt);
2858                 *stt = NULL;
2859                 iscsi_unregister_transport(itp);
2860         }
2861 }
2862 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2863
2864 umode_t cxgbi_attr_is_visible(int param_type, int param)
2865 {
2866         switch (param_type) {
2867         case ISCSI_HOST_PARAM:
2868                 switch (param) {
2869                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2870                 case ISCSI_HOST_PARAM_HWADDRESS:
2871                 case ISCSI_HOST_PARAM_IPADDRESS:
2872                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2873                         return S_IRUGO;
2874                 default:
2875                         return 0;
2876                 }
2877         case ISCSI_PARAM:
2878                 switch (param) {
2879                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2880                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2881                 case ISCSI_PARAM_HDRDGST_EN:
2882                 case ISCSI_PARAM_DATADGST_EN:
2883                 case ISCSI_PARAM_CONN_ADDRESS:
2884                 case ISCSI_PARAM_CONN_PORT:
2885                 case ISCSI_PARAM_EXP_STATSN:
2886                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2887                 case ISCSI_PARAM_PERSISTENT_PORT:
2888                 case ISCSI_PARAM_PING_TMO:
2889                 case ISCSI_PARAM_RECV_TMO:
2890                 case ISCSI_PARAM_INITIAL_R2T_EN:
2891                 case ISCSI_PARAM_MAX_R2T:
2892                 case ISCSI_PARAM_IMM_DATA_EN:
2893                 case ISCSI_PARAM_FIRST_BURST:
2894                 case ISCSI_PARAM_MAX_BURST:
2895                 case ISCSI_PARAM_PDU_INORDER_EN:
2896                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2897                 case ISCSI_PARAM_ERL:
2898                 case ISCSI_PARAM_TARGET_NAME:
2899                 case ISCSI_PARAM_TPGT:
2900                 case ISCSI_PARAM_USERNAME:
2901                 case ISCSI_PARAM_PASSWORD:
2902                 case ISCSI_PARAM_USERNAME_IN:
2903                 case ISCSI_PARAM_PASSWORD_IN:
2904                 case ISCSI_PARAM_FAST_ABORT:
2905                 case ISCSI_PARAM_ABORT_TMO:
2906                 case ISCSI_PARAM_LU_RESET_TMO:
2907                 case ISCSI_PARAM_TGT_RESET_TMO:
2908                 case ISCSI_PARAM_IFACE_NAME:
2909                 case ISCSI_PARAM_INITIATOR_NAME:
2910                         return S_IRUGO;
2911                 default:
2912                         return 0;
2913                 }
2914         }
2915
2916         return 0;
2917 }
2918 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2919
2920 static int __init libcxgbi_init_module(void)
2921 {
2922         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2923         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2924
2925         pr_info("%s", version);
2926
2927         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2928                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2929                 ISCSI_AGE_MASK, sw_tag_age_bits);
2930
2931         ddp_setup_host_page_size();
2932         return 0;
2933 }
2934
2935 static void __exit libcxgbi_exit_module(void)
2936 {
2937         cxgbi_device_unregister_all(0xFF);
2938         return;
2939 }
2940
2941 module_init(libcxgbi_init_module);
2942 module_exit(libcxgbi_exit_module);