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 ([email protected])
  11  * Written by: Rakesh Ranjan ([email protected])
  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 static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
  68 {
  69         if (age)
  70                 *age = sw_tag & 0x7FFF;
  71         if (idx)
  72                 *idx = (sw_tag >> 16) & 0x7FFF;
  73 }
  74
  75 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  76                                 unsigned int max_conn)
  77 {
  78         struct cxgbi_ports_map *pmap = &cdev->pmap;
  79
  80         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  81                                              sizeof(struct cxgbi_sock *),
  82                                              GFP_KERNEL);
  83         if (!pmap->port_csk) {
  84                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  85                 return -ENOMEM;
  86         }
  87
  88         pmap->max_connect = max_conn;
  89         pmap->sport_base = base;
  90         spin_lock_init(&pmap->lock);
  91         return 0;
  92 }
  93 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  94
  95 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  96 {
  97         struct cxgbi_ports_map *pmap = &cdev->pmap;
  98         struct cxgbi_sock *csk;
  99         int i;
 100
 101         for (i = 0; i < pmap->max_connect; i++) {
 102                 if (pmap->port_csk[i]) {
 103                         csk = pmap->port_csk[i];
 104                         pmap->port_csk[i] = NULL;
 105                         log_debug(1 << CXGBI_DBG_SOCK,
 106                                 "csk 0x%p, cdev 0x%p, offload down.\n",
 107                                 csk, cdev);
 108                         spin_lock_bh(&csk->lock);
 109                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
 110                         cxgbi_sock_closed(csk);
 111                         spin_unlock_bh(&csk->lock);
 112                         cxgbi_sock_put(csk);
 113                 }
 114         }
 115 }
 116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 117
 118 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 119 {
 120         log_debug(1 << CXGBI_DBG_DEV,
 121                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 122         cxgbi_hbas_remove(cdev);
 123         cxgbi_device_portmap_cleanup(cdev);
 124         cxgbi_ppm_release(cdev->cdev2ppm(cdev));
 125         if (cdev->pmap.max_connect)
 126                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 127         kfree(cdev);
 128 }
 129
 130 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 131                                            unsigned int nports)
 132 {
 133         struct cxgbi_device *cdev;
 134
 135         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 136                         (sizeof(struct cxgbi_hba *) +
 137                          sizeof(struct net_device *)),
 138                         GFP_KERNEL);
 139         if (!cdev) {
 140                 pr_warn("nport %d, OOM.\n", nports);
 141                 return NULL;
 142         }
 143         cdev->ports = (struct net_device **)(cdev + 1);
 144         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 145                                                 sizeof(struct net_device *));
 146         if (extra)
 147                 cdev->dd_data = ((char *)cdev->hbas) +
 148                                 nports * sizeof(struct cxgbi_hba *);
 149         spin_lock_init(&cdev->pmap.lock);
 150
 151         mutex_lock(&cdev_mutex);
 152         list_add_tail(&cdev->list_head, &cdev_list);
 153         mutex_unlock(&cdev_mutex);
 154
 155         spin_lock(&cdev_rcu_lock);
 156         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 157         spin_unlock(&cdev_rcu_lock);
 158
 159         log_debug(1 << CXGBI_DBG_DEV,
 160                 "cdev 0x%p, p# %u.\n", cdev, nports);
 161         return cdev;
 162 }
 163 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 164
 165 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 166 {
 167         log_debug(1 << CXGBI_DBG_DEV,
 168                 "cdev 0x%p, p# %u,%s.\n",
 169                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 170
 171         mutex_lock(&cdev_mutex);
 172         list_del(&cdev->list_head);
 173         mutex_unlock(&cdev_mutex);
 174
 175         spin_lock(&cdev_rcu_lock);
 176         list_del_rcu(&cdev->rcu_node);
 177         spin_unlock(&cdev_rcu_lock);
 178         synchronize_rcu();
 179
 180         cxgbi_device_destroy(cdev);
 181 }
 182 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 183
 184 void cxgbi_device_unregister_all(unsigned int flag)
 185 {
 186         struct cxgbi_device *cdev, *tmp;
 187
 188         mutex_lock(&cdev_mutex);
 189         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 190                 if ((cdev->flags & flag) == flag) {
 191                         mutex_unlock(&cdev_mutex);
 192                         cxgbi_device_unregister(cdev);
 193                         mutex_lock(&cdev_mutex);
 194                 }
 195         }
 196         mutex_unlock(&cdev_mutex);
 197 }
 198 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 199
 200 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 201 {
 202         struct cxgbi_device *cdev, *tmp;
 203
 204         mutex_lock(&cdev_mutex);
 205         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 206                 if (cdev->lldev == lldev) {
 207                         mutex_unlock(&cdev_mutex);
 208                         return cdev;
 209                 }
 210         }
 211         mutex_unlock(&cdev_mutex);
 212
 213         log_debug(1 << CXGBI_DBG_DEV,
 214                 "lldev 0x%p, NO match found.\n", lldev);
 215         return NULL;
 216 }
 217 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 218
 219 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 220                                                  int *port)
 221 {
 222         struct net_device *vdev = NULL;
 223         struct cxgbi_device *cdev, *tmp;
 224         int i;
 225
 226         if (is_vlan_dev(ndev)) {
 227                 vdev = ndev;
 228                 ndev = vlan_dev_real_dev(ndev);
 229                 log_debug(1 << CXGBI_DBG_DEV,
 230                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 231         }
 232
 233         mutex_lock(&cdev_mutex);
 234         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 235                 for (i = 0; i < cdev->nports; i++) {
 236                         if (ndev == cdev->ports[i]) {
 237                                 cdev->hbas[i]->vdev = vdev;
 238                                 mutex_unlock(&cdev_mutex);
 239                                 if (port)
 240                                         *port = i;
 241                                 return cdev;
 242                         }
 243                 }
 244         }
 245         mutex_unlock(&cdev_mutex);
 246         log_debug(1 << CXGBI_DBG_DEV,
 247                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 248         return NULL;
 249 }
 250 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 251
 252 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 253                                                      int *port)
 254 {
 255         struct net_device *vdev = NULL;
 256         struct cxgbi_device *cdev;
 257         int i;
 258
 259         if (is_vlan_dev(ndev)) {
 260                 vdev = ndev;
 261                 ndev = vlan_dev_real_dev(ndev);
 262                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 263         }
 264
 265         rcu_read_lock();
 266         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 267                 for (i = 0; i < cdev->nports; i++) {
 268                         if (ndev == cdev->ports[i]) {
 269                                 cdev->hbas[i]->vdev = vdev;
 270                                 rcu_read_unlock();
 271                                 if (port)
 272                                         *port = i;
 273                                 return cdev;
 274                         }
 275                 }
 276         }
 277         rcu_read_unlock();
 278
 279         log_debug(1 << CXGBI_DBG_DEV,
 280                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 281         return NULL;
 282 }
 283 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 284
 285 #if IS_ENABLED(CONFIG_IPV6)
 286 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 287                                                      int *port)
 288 {
 289         struct net_device *vdev = NULL;
 290         struct cxgbi_device *cdev, *tmp;
 291         int i;
 292
 293         if (is_vlan_dev(ndev)) {
 294                 vdev = ndev;
 295                 ndev = vlan_dev_real_dev(ndev);
 296                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 297         }
 298
 299         mutex_lock(&cdev_mutex);
 300         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 301                 for (i = 0; i < cdev->nports; i++) {
 302                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 303                                     MAX_ADDR_LEN)) {
 304                                 cdev->hbas[i]->vdev = vdev;
 305                                 mutex_unlock(&cdev_mutex);
 306                                 if (port)
 307                                         *port = i;
 308                                 return cdev;
 309                         }
 310                 }
 311         }
 312         mutex_unlock(&cdev_mutex);
 313         log_debug(1 << CXGBI_DBG_DEV,
 314                   "ndev 0x%p, %s, NO match mac found.\n",
 315                   ndev, ndev->name);
 316         return NULL;
 317 }
 318 #endif
 319
 320 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 321 {
 322         int i;
 323         struct cxgbi_hba *chba;
 324
 325         log_debug(1 << CXGBI_DBG_DEV,
 326                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 327
 328         for (i = 0; i < cdev->nports; i++) {
 329                 chba = cdev->hbas[i];
 330                 if (chba) {
 331                         cdev->hbas[i] = NULL;
 332                         iscsi_host_remove(chba->shost);
 333                         pci_dev_put(cdev->pdev);
 334                         iscsi_host_free(chba->shost);
 335                 }
 336         }
 337 }
 338 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 339
 340 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 341                 unsigned int max_id, struct scsi_host_template *sht,
 342                 struct scsi_transport_template *stt)
 343 {
 344         struct cxgbi_hba *chba;
 345         struct Scsi_Host *shost;
 346         int i, err;
 347
 348         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 349
 350         for (i = 0; i < cdev->nports; i++) {
 351                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 352                 if (!shost) {
 353                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 354                                 cdev, i, cdev->ports[i]->name);
 355                         err = -ENOMEM;
 356                         goto err_out;
 357                 }
 358
 359                 shost->transportt = stt;
 360                 shost->max_lun = max_lun;
 361                 shost->max_id = max_id;
 362                 shost->max_channel = 0;
 363                 shost->max_cmd_len = 16;
 364
 365                 chba = iscsi_host_priv(shost);
 366                 chba->cdev = cdev;
 367                 chba->ndev = cdev->ports[i];
 368                 chba->shost = shost;
 369
 370                 log_debug(1 << CXGBI_DBG_DEV,
 371                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 372                         cdev, i, cdev->ports[i]->name, chba);
 373
 374                 pci_dev_get(cdev->pdev);
 375                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 376                 if (err) {
 377                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 378                                 cdev, i, cdev->ports[i]->name);
 379                         pci_dev_put(cdev->pdev);
 380                         scsi_host_put(shost);
 381                         goto  err_out;
 382                 }
 383
 384                 cdev->hbas[i] = chba;
 385         }
 386
 387         return 0;
 388
 389 err_out:
 390         cxgbi_hbas_remove(cdev);
 391         return err;
 392 }
 393 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 394
 395 /*
 396  * iSCSI offload
 397  *
 398  * - source port management
 399  *   To find a free source port in the port allocation map we use a very simple
 400  *   rotor scheme to look for the next free port.
 401  *
 402  *   If a source port has been specified make sure that it doesn't collide with
 403  *   our normal source port allocation map.  If it's outside the range of our
 404  *   allocation/deallocation scheme just let them use it.
 405  *
 406  *   If the source port is outside our allocation range, the caller is
 407  *   responsible for keeping track of their port usage.
 408  */
 409
 410 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 411                                             unsigned char port_id)
 412 {
 413         struct cxgbi_ports_map *pmap = &cdev->pmap;
 414         unsigned int i;
 415         unsigned int used;
 416
 417         if (!pmap->max_connect || !pmap->used)
 418                 return NULL;
 419
 420         spin_lock_bh(&pmap->lock);
 421         used = pmap->used;
 422         for (i = 0; used && i < pmap->max_connect; i++) {
 423                 struct cxgbi_sock *csk = pmap->port_csk[i];
 424
 425                 if (csk) {
 426                         if (csk->port_id == port_id) {
 427                                 spin_unlock_bh(&pmap->lock);
 428                                 return csk;
 429                         }
 430                         used--;
 431                 }
 432         }
 433         spin_unlock_bh(&pmap->lock);
 434
 435         return NULL;
 436 }
 437
 438 static int sock_get_port(struct cxgbi_sock *csk)
 439 {
 440         struct cxgbi_device *cdev = csk->cdev;
 441         struct cxgbi_ports_map *pmap = &cdev->pmap;
 442         unsigned int start;
 443         int idx;
 444         __be16 *port;
 445
 446         if (!pmap->max_connect) {
 447                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 448                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 449                 return -EADDRNOTAVAIL;
 450         }
 451
 452         if (csk->csk_family == AF_INET)
 453                 port = &csk->saddr.sin_port;
 454         else /* ipv6 */
 455                 port = &csk->saddr6.sin6_port;
 456
 457         if (*port) {
 458                 pr_err("source port NON-ZERO %u.\n",
 459                         ntohs(*port));
 460                 return -EADDRINUSE;
 461         }
 462
 463         spin_lock_bh(&pmap->lock);
 464         if (pmap->used >= pmap->max_connect) {
 465                 spin_unlock_bh(&pmap->lock);
 466                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 467                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 468                 return -EADDRNOTAVAIL;
 469         }
 470
 471         start = idx = pmap->next;
 472         do {
 473                 if (++idx >= pmap->max_connect)
 474                         idx = 0;
 475                 if (!pmap->port_csk[idx]) {
 476                         pmap->used++;
 477                         *port = htons(pmap->sport_base + idx);
 478                         pmap->next = idx;
 479                         pmap->port_csk[idx] = csk;
 480                         spin_unlock_bh(&pmap->lock);
 481                         cxgbi_sock_get(csk);
 482                         log_debug(1 << CXGBI_DBG_SOCK,
 483                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 484                                 cdev, csk->port_id,
 485                                 cdev->ports[csk->port_id]->name,
 486                                 pmap->sport_base + idx, pmap->next);
 487                         return 0;
 488                 }
 489         } while (idx != start);
 490         spin_unlock_bh(&pmap->lock);
 491
 492         /* should not happen */
 493         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 494                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 495                 pmap->next);
 496         return -EADDRNOTAVAIL;
 497 }
 498
 499 static void sock_put_port(struct cxgbi_sock *csk)
 500 {
 501         struct cxgbi_device *cdev = csk->cdev;
 502         struct cxgbi_ports_map *pmap = &cdev->pmap;
 503         __be16 *port;
 504
 505         if (csk->csk_family == AF_INET)
 506                 port = &csk->saddr.sin_port;
 507         else /* ipv6 */
 508                 port = &csk->saddr6.sin6_port;
 509
 510         if (*port) {
 511                 int idx = ntohs(*port) - pmap->sport_base;
 512
 513                 *port = 0;
 514                 if (idx < 0 || idx >= pmap->max_connect) {
 515                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 516                                 cdev, csk->port_id,
 517                                 cdev->ports[csk->port_id]->name,
 518                                 ntohs(*port));
 519                         return;
 520                 }
 521
 522                 spin_lock_bh(&pmap->lock);
 523                 pmap->port_csk[idx] = NULL;
 524                 pmap->used--;
 525                 spin_unlock_bh(&pmap->lock);
 526
 527                 log_debug(1 << CXGBI_DBG_SOCK,
 528                         "cdev 0x%p, p#%u %s, release %u.\n",
 529                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 530                         pmap->sport_base + idx);
 531
 532                 cxgbi_sock_put(csk);
 533         }
 534 }
 535
 536 /*
 537  * iscsi tcp connection
 538  */
 539 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 540 {
 541         if (csk->cpl_close) {
 542                 kfree_skb(csk->cpl_close);
 543                 csk->cpl_close = NULL;
 544         }
 545         if (csk->cpl_abort_req) {
 546                 kfree_skb(csk->cpl_abort_req);
 547                 csk->cpl_abort_req = NULL;
 548         }
 549         if (csk->cpl_abort_rpl) {
 550                 kfree_skb(csk->cpl_abort_rpl);
 551                 csk->cpl_abort_rpl = NULL;
 552         }
 553 }
 554 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 555
 556 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 557 {
 558         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 559
 560         if (!csk) {
 561                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 562                 return NULL;
 563         }
 564
 565         if (cdev->csk_alloc_cpls(csk) < 0) {
 566                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 567                 kfree(csk);
 568                 return NULL;
 569         }
 570
 571         spin_lock_init(&csk->lock);
 572         kref_init(&csk->refcnt);
 573         skb_queue_head_init(&csk->receive_queue);
 574         skb_queue_head_init(&csk->write_queue);
 575         timer_setup(&csk->retry_timer, NULL, 0);
 576         rwlock_init(&csk->callback_lock);
 577         csk->cdev = cdev;
 578         csk->flags = 0;
 579         cxgbi_sock_set_state(csk, CTP_CLOSED);
 580
 581         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 582
 583         return csk;
 584 }
 585
 586 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 587                                       __be32 saddr, __be32 daddr,
 588                                       __be16 sport, __be16 dport, u8 tos,
 589                                       int ifindex)
 590 {
 591         struct rtable *rt;
 592
 593         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 594                                    dport, sport, IPPROTO_TCP, tos, ifindex);
 595         if (IS_ERR(rt))
 596                 return NULL;
 597
 598         return rt;
 599 }
 600
 601 static struct cxgbi_sock *
 602 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
 603 {
 604         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 605         struct dst_entry *dst;
 606         struct net_device *ndev;
 607         struct cxgbi_device *cdev;
 608         struct rtable *rt = NULL;
 609         struct neighbour *n;
 610         struct flowi4 fl4;
 611         struct cxgbi_sock *csk = NULL;
 612         unsigned int mtu = 0;
 613         int port = 0xFFFF;
 614         int err = 0;
 615
 616         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
 617                              daddr->sin_port, 0, ifindex);
 618         if (!rt) {
 619                 pr_info("no route to ipv4 0x%x, port %u.\n",
 620                         be32_to_cpu(daddr->sin_addr.s_addr),
 621                         be16_to_cpu(daddr->sin_port));
 622                 err = -ENETUNREACH;
 623                 goto err_out;
 624         }
 625         dst = &rt->dst;
 626         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 627         if (!n) {
 628                 err = -ENODEV;
 629                 goto rel_rt;
 630         }
 631         ndev = n->dev;
 632
 633         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 634                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 635                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 636                         ndev->name);
 637                 err = -ENETUNREACH;
 638                 goto rel_neigh;
 639         }
 640
 641         if (ndev->flags & IFF_LOOPBACK) {
 642                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 643                 mtu = ndev->mtu;
 644                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 645                         n->dev->name, ndev->name, mtu);
 646         }
 647
 648         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 649                 pr_info("%s interface not up.\n", ndev->name);
 650                 err = -ENETDOWN;
 651                 goto rel_neigh;
 652         }
 653
 654         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 655         if (!cdev) {
 656                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 657                         &daddr->sin_addr.s_addr, ndev->name);
 658                 err = -ENETUNREACH;
 659                 goto rel_neigh;
 660         }
 661         log_debug(1 << CXGBI_DBG_SOCK,
 662                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 663                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 664                            port, ndev->name, cdev);
 665
 666         csk = cxgbi_sock_create(cdev);
 667         if (!csk) {
 668                 err = -ENOMEM;
 669                 goto rel_neigh;
 670         }
 671         csk->cdev = cdev;
 672         csk->port_id = port;
 673         csk->mtu = mtu;
 674         csk->dst = dst;
 675
 676         csk->csk_family = AF_INET;
 677         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 678         csk->daddr.sin_port = daddr->sin_port;
 679         csk->daddr.sin_family = daddr->sin_family;
 680         csk->saddr.sin_family = daddr->sin_family;
 681         csk->saddr.sin_addr.s_addr = fl4.saddr;
 682         neigh_release(n);
 683
 684         return csk;
 685
 686 rel_neigh:
 687         neigh_release(n);
 688
 689 rel_rt:
 690         ip_rt_put(rt);
 691 err_out:
 692         return ERR_PTR(err);
 693 }
 694
 695 #if IS_ENABLED(CONFIG_IPV6)
 696 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 697                                         const struct in6_addr *daddr,
 698                                         int ifindex)
 699 {
 700         struct flowi6 fl;
 701
 702         memset(&fl, 0, sizeof(fl));
 703         fl.flowi6_oif = ifindex;
 704         if (saddr)
 705                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 706         if (daddr)
 707                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 708         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 709 }
 710
 711 static struct cxgbi_sock *
 712 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
 713 {
 714         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 715         struct dst_entry *dst;
 716         struct net_device *ndev;
 717         struct cxgbi_device *cdev;
 718         struct rt6_info *rt = NULL;
 719         struct neighbour *n;
 720         struct in6_addr pref_saddr;
 721         struct cxgbi_sock *csk = NULL;
 722         unsigned int mtu = 0;
 723         int port = 0xFFFF;
 724         int err = 0;
 725
 726         rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
 727
 728         if (!rt) {
 729                 pr_info("no route to ipv6 %pI6 port %u\n",
 730                         daddr6->sin6_addr.s6_addr,
 731                         be16_to_cpu(daddr6->sin6_port));
 732                 err = -ENETUNREACH;
 733                 goto err_out;
 734         }
 735
 736         dst = &rt->dst;
 737
 738         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 739
 740         if (!n) {
 741                 pr_info("%pI6, port %u, dst no neighbour.\n",
 742                         daddr6->sin6_addr.s6_addr,
 743                         be16_to_cpu(daddr6->sin6_port));
 744                 err = -ENETUNREACH;
 745                 goto rel_rt;
 746         }
 747         ndev = n->dev;
 748
 749         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 750                 pr_info("%s interface not up.\n", ndev->name);
 751                 err = -ENETDOWN;
 752                 goto rel_rt;
 753         }
 754
 755         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 756                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 757                         daddr6->sin6_addr.s6_addr,
 758                         ntohs(daddr6->sin6_port), ndev->name);
 759                 err = -ENETUNREACH;
 760                 goto rel_rt;
 761         }
 762
 763         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 764         if (!cdev)
 765                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 766         if (!cdev) {
 767                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 768                         daddr6->sin6_addr.s6_addr, ndev->name);
 769                 err = -ENETUNREACH;
 770                 goto rel_rt;
 771         }
 772         log_debug(1 << CXGBI_DBG_SOCK,
 773                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 774                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 775                   ndev->name, cdev);
 776
 777         csk = cxgbi_sock_create(cdev);
 778         if (!csk) {
 779                 err = -ENOMEM;
 780                 goto rel_rt;
 781         }
 782         csk->cdev = cdev;
 783         csk->port_id = port;
 784         csk->mtu = mtu;
 785         csk->dst = dst;
 786
 787         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 788                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 789
 790                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 791                                          &daddr6->sin6_addr, 0, &pref_saddr);
 792                 if (err) {
 793                         pr_info("failed to get source address to reach %pI6\n",
 794                                 &daddr6->sin6_addr);
 795                         goto rel_rt;
 796                 }
 797         } else {
 798                 pref_saddr = rt->rt6i_prefsrc.addr;
 799         }
 800
 801         csk->csk_family = AF_INET6;
 802         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 803         csk->daddr6.sin6_port = daddr6->sin6_port;
 804         csk->daddr6.sin6_family = daddr6->sin6_family;
 805         csk->saddr6.sin6_family = daddr6->sin6_family;
 806         csk->saddr6.sin6_addr = pref_saddr;
 807
 808         neigh_release(n);
 809         return csk;
 810
 811 rel_rt:
 812         if (n)
 813                 neigh_release(n);
 814
 815         ip6_rt_put(rt);
 816         if (csk)
 817                 cxgbi_sock_closed(csk);
 818 err_out:
 819         return ERR_PTR(err);
 820 }
 821 #endif /* IS_ENABLED(CONFIG_IPV6) */
 822
 823 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 824                         unsigned int opt)
 825 {
 826         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 827         dst_confirm(csk->dst);
 828         smp_mb();
 829         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 830 }
 831 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 832
 833 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 834 {
 835         log_debug(1 << CXGBI_DBG_SOCK,
 836                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 837                 csk, csk->state, csk->flags, csk->user_data);
 838
 839         if (csk->state != CTP_ESTABLISHED) {
 840                 read_lock_bh(&csk->callback_lock);
 841                 if (csk->user_data)
 842                         iscsi_conn_failure(csk->user_data,
 843                                         ISCSI_ERR_TCP_CONN_CLOSE);
 844                 read_unlock_bh(&csk->callback_lock);
 845         }
 846 }
 847
 848 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 849 {
 850         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 851                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 852         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 853         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 854                 return;
 855         if (csk->saddr.sin_port)
 856                 sock_put_port(csk);
 857         if (csk->dst)
 858                 dst_release(csk->dst);
 859         csk->cdev->csk_release_offload_resources(csk);
 860         cxgbi_sock_set_state(csk, CTP_CLOSED);
 861         cxgbi_inform_iscsi_conn_closing(csk);
 862         cxgbi_sock_put(csk);
 863 }
 864 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 865
 866 static void need_active_close(struct cxgbi_sock *csk)
 867 {
 868         int data_lost;
 869         int close_req = 0;
 870
 871         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 872                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 873         spin_lock_bh(&csk->lock);
 874         if (csk->dst)
 875                 dst_confirm(csk->dst);
 876         data_lost = skb_queue_len(&csk->receive_queue);
 877         __skb_queue_purge(&csk->receive_queue);
 878
 879         if (csk->state == CTP_ACTIVE_OPEN)
 880                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 881         else if (csk->state == CTP_ESTABLISHED) {
 882                 close_req = 1;
 883                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 884         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 885                 close_req = 1;
 886                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 887         }
 888
 889         if (close_req) {
 890                 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
 891                     data_lost)
 892                         csk->cdev->csk_send_abort_req(csk);
 893                 else
 894                         csk->cdev->csk_send_close_req(csk);
 895         }
 896
 897         spin_unlock_bh(&csk->lock);
 898 }
 899
 900 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 901 {
 902         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 903                         csk, csk->state, csk->flags,
 904                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 905                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 906                         errno);
 907
 908         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 909         csk->err = errno;
 910         cxgbi_sock_closed(csk);
 911 }
 912 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 913
 914 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 915 {
 916         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 917         struct module *owner = csk->cdev->owner;
 918
 919         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 920                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 921         cxgbi_sock_get(csk);
 922         spin_lock_bh(&csk->lock);
 923         if (csk->state == CTP_ACTIVE_OPEN)
 924                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 925         spin_unlock_bh(&csk->lock);
 926         cxgbi_sock_put(csk);
 927         __kfree_skb(skb);
 928
 929         module_put(owner);
 930 }
 931 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 932
 933 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 934 {
 935         cxgbi_sock_get(csk);
 936         spin_lock_bh(&csk->lock);
 937
 938         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 939         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 940                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 941                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 942                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 943                                csk, csk->state, csk->flags, csk->tid);
 944                 cxgbi_sock_closed(csk);
 945         }
 946
 947         spin_unlock_bh(&csk->lock);
 948         cxgbi_sock_put(csk);
 949 }
 950 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 951
 952 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 953 {
 954         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 955                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 956         cxgbi_sock_get(csk);
 957         spin_lock_bh(&csk->lock);
 958
 959         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 960                 goto done;
 961
 962         switch (csk->state) {
 963         case CTP_ESTABLISHED:
 964                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 965                 break;
 966         case CTP_ACTIVE_CLOSE:
 967                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 968                 break;
 969         case CTP_CLOSE_WAIT_1:
 970                 cxgbi_sock_closed(csk);
 971                 break;
 972         case CTP_ABORTING:
 973                 break;
 974         default:
 975                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 976                         csk, csk->state, csk->flags, csk->tid);
 977         }
 978         cxgbi_inform_iscsi_conn_closing(csk);
 979 done:
 980         spin_unlock_bh(&csk->lock);
 981         cxgbi_sock_put(csk);
 982 }
 983 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 984
 985 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 986 {
 987         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 988                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 989         cxgbi_sock_get(csk);
 990         spin_lock_bh(&csk->lock);
 991
 992         csk->snd_una = snd_nxt - 1;
 993         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 994                 goto done;
 995
 996         switch (csk->state) {
 997         case CTP_ACTIVE_CLOSE:
 998                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 999                 break;
1000         case CTP_CLOSE_WAIT_1:
1001         case CTP_CLOSE_WAIT_2:
1002                 cxgbi_sock_closed(csk);
1003                 break;
1004         case CTP_ABORTING:
1005                 break;
1006         default:
1007                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1008                         csk, csk->state, csk->flags, csk->tid);
1009         }
1010 done:
1011         spin_unlock_bh(&csk->lock);
1012         cxgbi_sock_put(csk);
1013 }
1014 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1015
1016 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1017                            unsigned int snd_una, int seq_chk)
1018 {
1019         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1020                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1021                         csk, csk->state, csk->flags, csk->tid, credits,
1022                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1023
1024         spin_lock_bh(&csk->lock);
1025
1026         csk->wr_cred += credits;
1027         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1028                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1029
1030         while (credits) {
1031                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1032
1033                 if (unlikely(!p)) {
1034                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1035                                 csk, csk->state, csk->flags, csk->tid, credits,
1036                                 csk->wr_cred, csk->wr_una_cred);
1037                         break;
1038                 }
1039
1040                 if (unlikely(credits < p->csum)) {
1041                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1042                                 csk, csk->state, csk->flags, csk->tid,
1043                                 credits, csk->wr_cred, csk->wr_una_cred,
1044                                 p->csum);
1045                         p->csum -= credits;
1046                         break;
1047                 } else {
1048                         cxgbi_sock_dequeue_wr(csk);
1049                         credits -= p->csum;
1050                         kfree_skb(p);
1051                 }
1052         }
1053
1054         cxgbi_sock_check_wr_invariants(csk);
1055
1056         if (seq_chk) {
1057                 if (unlikely(before(snd_una, csk->snd_una))) {
1058                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1059                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1060                                 csk->snd_una);
1061                         goto done;
1062                 }
1063
1064                 if (csk->snd_una != snd_una) {
1065                         csk->snd_una = snd_una;
1066                         dst_confirm(csk->dst);
1067                 }
1068         }
1069
1070         if (skb_queue_len(&csk->write_queue)) {
1071                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1072                         cxgbi_conn_tx_open(csk);
1073         } else
1074                 cxgbi_conn_tx_open(csk);
1075 done:
1076         spin_unlock_bh(&csk->lock);
1077 }
1078 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1079
1080 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1081                                              unsigned short mtu)
1082 {
1083         int i = 0;
1084
1085         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1086                 ++i;
1087
1088         return i;
1089 }
1090
1091 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1092 {
1093         unsigned int idx;
1094         struct dst_entry *dst = csk->dst;
1095
1096         csk->advmss = dst_metric_advmss(dst);
1097
1098         if (csk->advmss > pmtu - 40)
1099                 csk->advmss = pmtu - 40;
1100         if (csk->advmss < csk->cdev->mtus[0] - 40)
1101                 csk->advmss = csk->cdev->mtus[0] - 40;
1102         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1103
1104         return idx;
1105 }
1106 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1107
1108 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1109 {
1110         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1111         __skb_queue_tail(&csk->write_queue, skb);
1112 }
1113 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1114
1115 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1116 {
1117         struct sk_buff *skb;
1118
1119         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1120                 kfree_skb(skb);
1121 }
1122 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1123
1124 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1125 {
1126         int pending = cxgbi_sock_count_pending_wrs(csk);
1127
1128         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1129                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1130                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1131 }
1132 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1133
1134 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1135 {
1136         struct cxgbi_device *cdev = csk->cdev;
1137         struct sk_buff *next;
1138         int err, copied = 0;
1139
1140         spin_lock_bh(&csk->lock);
1141
1142         if (csk->state != CTP_ESTABLISHED) {
1143                 log_debug(1 << CXGBI_DBG_PDU_TX,
1144                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1145                         csk, csk->state, csk->flags, csk->tid);
1146                 err = -EAGAIN;
1147                 goto out_err;
1148         }
1149
1150         if (csk->err) {
1151                 log_debug(1 << CXGBI_DBG_PDU_TX,
1152                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1153                         csk, csk->state, csk->flags, csk->tid, csk->err);
1154                 err = -EPIPE;
1155                 goto out_err;
1156         }
1157
1158         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1159                 log_debug(1 << CXGBI_DBG_PDU_TX,
1160                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1161                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1162                         csk->snd_una, csk->snd_win);
1163                 err = -ENOBUFS;
1164                 goto out_err;
1165         }
1166
1167         while (skb) {
1168                 int frags = skb_shinfo(skb)->nr_frags +
1169                                 (skb->len != skb->data_len);
1170
1171                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1172                         pr_err("csk 0x%p, skb head %u < %u.\n",
1173                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1174                         err = -EINVAL;
1175                         goto out_err;
1176                 }
1177
1178                 if (frags >= SKB_WR_LIST_SIZE) {
1179                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1180                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1181                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1182                         err = -EINVAL;
1183                         goto out_err;
1184                 }
1185
1186                 next = skb->next;
1187                 skb->next = NULL;
1188                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1189                 cxgbi_sock_skb_entail(csk, skb);
1190                 copied += skb->len;
1191                 csk->write_seq += skb->len +
1192                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1193                 skb = next;
1194         }
1195
1196         if (likely(skb_queue_len(&csk->write_queue)))
1197                 cdev->csk_push_tx_frames(csk, 1);
1198 done:
1199         spin_unlock_bh(&csk->lock);
1200         return copied;
1201
1202 out_err:
1203         if (copied == 0 && err == -EPIPE)
1204                 copied = csk->err ? csk->err : -EPIPE;
1205         else
1206                 copied = err;
1207         goto done;
1208 }
1209
1210 static inline void
1211 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1212                 unsigned int *sgcnt, unsigned int *dlen,
1213                 unsigned int prot)
1214 {
1215         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1216
1217         *sgl = sdb->table.sgl;
1218         *sgcnt = sdb->table.nents;
1219         *dlen = sdb->length;
1220         /* Caution: for protection sdb, sdb->length is invalid */
1221 }
1222
1223 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1224                             struct cxgbi_task_tag_info *ttinfo,
1225                             struct scatterlist **sg_pp, unsigned int *sg_off)
1226 {
1227         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1228         unsigned int offset = sg_off ? *sg_off : 0;
1229         dma_addr_t addr = 0UL;
1230         unsigned int len = 0;
1231         int i;
1232
1233         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1234
1235         if (sg) {
1236                 addr = sg_dma_address(sg);
1237                 len = sg_dma_len(sg);
1238         }
1239
1240         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1241                 if (sg) {
1242                         ppod->addr[i] = cpu_to_be64(addr + offset);
1243                         offset += PAGE_SIZE;
1244                         if (offset == (len + sg->offset)) {
1245                                 offset = 0;
1246                                 sg = sg_next(sg);
1247                                 if (sg) {
1248                                         addr = sg_dma_address(sg);
1249                                         len = sg_dma_len(sg);
1250                                 }
1251                         }
1252                 } else {
1253                         ppod->addr[i] = 0ULL;
1254                 }
1255         }
1256
1257         /*
1258          * the fifth address needs to be repeated in the next ppod, so do
1259          * not move sg
1260          */
1261         if (sg_pp) {
1262                 *sg_pp = sg;
1263                 *sg_off = offset;
1264         }
1265
1266         if (offset == len) {
1267                 offset = 0;
1268                 sg = sg_next(sg);
1269                 if (sg) {
1270                         addr = sg_dma_address(sg);
1271                         len = sg_dma_len(sg);
1272                 }
1273         }
1274         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1275 }
1276 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1277
1278 /*
1279  * APIs interacting with open-iscsi libraries
1280  */
1281
1282 static unsigned char padding[4];
1283
1284 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1285                          struct cxgbi_tag_format *tformat, unsigned int ppmax,
1286                          unsigned int llimit, unsigned int start,
1287                          unsigned int rsvd_factor)
1288 {
1289         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1290                                 cdev->lldev, tformat, ppmax, llimit, start,
1291                                 rsvd_factor);
1292
1293         if (err >= 0) {
1294                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1295
1296                 if (ppm->ppmax < 1024 ||
1297                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1298                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1299                 err = 0;
1300         } else {
1301                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1302         }
1303 }
1304 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1305
1306 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1307 {
1308         int i;
1309         int last_sgidx = nents - 1;
1310         struct scatterlist *sg = sgl;
1311
1312         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1313                 unsigned int len = sg->length + sg->offset;
1314
1315                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1316                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1317                         log_debug(1 << CXGBI_DBG_DDP,
1318                                   "sg %u/%u, %u,%u, not aligned.\n",
1319                                   i, nents, sg->offset, sg->length);
1320                         goto err_out;
1321                 }
1322         }
1323         return 0;
1324 err_out:
1325         return -EINVAL;
1326 }
1327
1328 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1329                              struct cxgbi_task_data *tdata, u32 sw_tag,
1330                              unsigned int xferlen)
1331 {
1332         struct cxgbi_sock *csk = cconn->cep->csk;
1333         struct cxgbi_device *cdev = csk->cdev;
1334         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1335         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1336         struct scatterlist *sgl = ttinfo->sgl;
1337         unsigned int sgcnt = ttinfo->nents;
1338         unsigned int sg_offset = sgl->offset;
1339         int err;
1340
1341         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1342                 log_debug(1 << CXGBI_DBG_DDP,
1343                           "cdev 0x%p DDP off.\n", cdev);
1344                 return -EINVAL;
1345         }
1346
1347         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1348             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1349                 log_debug(1 << CXGBI_DBG_DDP,
1350                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1351                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1352                           xferlen, ttinfo->nents);
1353                 return -EINVAL;
1354         }
1355
1356         /* make sure the buffer is suitable for ddp */
1357         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1358                 return -EINVAL;
1359
1360         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1361                             PAGE_SHIFT;
1362
1363         /*
1364          * the ddp tag will be used for the itt in the outgoing pdu,
1365          * the itt genrated by libiscsi is saved in the ppm and can be
1366          * retrieved via the ddp tag
1367          */
1368         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1369                                       &ttinfo->tag, (unsigned long)sw_tag);
1370         if (err < 0) {
1371                 cconn->ddp_full++;
1372                 return err;
1373         }
1374         ttinfo->npods = err;
1375
1376          /* setup dma from scsi command sgl */
1377         sgl->offset = 0;
1378         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1379         sgl->offset = sg_offset;
1380         if (err == 0) {
1381                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1382                         __func__, sw_tag, xferlen, sgcnt);
1383                 goto rel_ppods;
1384         }
1385         if (err != ttinfo->nr_pages) {
1386                 log_debug(1 << CXGBI_DBG_DDP,
1387                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1388                           __func__, sw_tag, xferlen, sgcnt, err);
1389         }
1390
1391         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1392         ttinfo->cid = csk->port_id;
1393
1394         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1395                                 xferlen, &ttinfo->hdr);
1396
1397         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1398                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1399                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1400         } else {
1401                 /* write ppod from control queue now */
1402                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1403                 if (err < 0)
1404                         goto rel_ppods;
1405         }
1406
1407         return 0;
1408
1409 rel_ppods:
1410         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1411
1412         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1413                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1414                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1415         }
1416         return -EINVAL;
1417 }
1418
1419 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1420 {
1421         struct scsi_cmnd *sc = task->sc;
1422         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1423         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1424         struct cxgbi_device *cdev = cconn->chba->cdev;
1425         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1426         u32 tag = ntohl((__force u32)hdr_itt);
1427
1428         log_debug(1 << CXGBI_DBG_DDP,
1429                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1430                   cdev, task, tag);
1431         if (sc &&
1432             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1433             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1434                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1435                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1436
1437                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1438                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1439                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1440                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1441                              DMA_FROM_DEVICE);
1442         }
1443 }
1444
1445 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1446 {
1447         /* assume idx and age both are < 0x7FFF (32767) */
1448         return (idx << 16) | age;
1449 }
1450
1451 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1452 {
1453         struct scsi_cmnd *sc = task->sc;
1454         struct iscsi_conn *conn = task->conn;
1455         struct iscsi_session *sess = conn->session;
1456         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1457         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1458         struct cxgbi_device *cdev = cconn->chba->cdev;
1459         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1460         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1461         u32 tag = 0;
1462         int err = -EINVAL;
1463
1464         if (sc &&
1465             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1466         ) {
1467                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1468                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1469
1470                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1471                                 &tdata->dlen, 0);
1472                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1473                 if (!err)
1474                         tag = ttinfo->tag;
1475                 else
1476                          log_debug(1 << CXGBI_DBG_DDP,
1477                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1478                                    cconn->cep->csk, task, tdata->dlen,
1479                                    ttinfo->nents);
1480         }
1481
1482         if (err < 0) {
1483                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1484                 if (err < 0)
1485                         return err;
1486         }
1487         /*  the itt need to sent in big-endian order */
1488         *hdr_itt = (__force itt_t)htonl(tag);
1489
1490         log_debug(1 << CXGBI_DBG_DDP,
1491                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1492                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1493         return 0;
1494 }
1495
1496 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1497 {
1498         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1499         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1500         struct cxgbi_device *cdev = cconn->chba->cdev;
1501         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1502         u32 tag = ntohl((__force u32)itt);
1503         u32 sw_bits;
1504
1505         if (ppm) {
1506                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1507                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1508                 else
1509                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1510         } else {
1511                 sw_bits = tag;
1512         }
1513
1514         cxgbi_decode_sw_tag(sw_bits, idx, age);
1515         log_debug(1 << CXGBI_DBG_DDP,
1516                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1517                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1518                   age ? *age : 0xFF);
1519 }
1520 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1521
1522 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1523 {
1524         struct iscsi_conn *conn = csk->user_data;
1525
1526         if (conn) {
1527                 log_debug(1 << CXGBI_DBG_SOCK,
1528                         "csk 0x%p, cid %d.\n", csk, conn->id);
1529                 iscsi_conn_queue_work(conn);
1530         }
1531 }
1532 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1533
1534 /*
1535  * pdu receive, interact with libiscsi_tcp
1536  */
1537 static inline int read_pdu_skb(struct iscsi_conn *conn,
1538                                struct sk_buff *skb,
1539                                unsigned int offset,
1540                                int offloaded)
1541 {
1542         int status = 0;
1543         int bytes_read;
1544
1545         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1546         switch (status) {
1547         case ISCSI_TCP_CONN_ERR:
1548                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1549                           skb, offset, offloaded);
1550                 return -EIO;
1551         case ISCSI_TCP_SUSPENDED:
1552                 log_debug(1 << CXGBI_DBG_PDU_RX,
1553                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1554                         skb, offset, offloaded, bytes_read);
1555                 /* no transfer - just have caller flush queue */
1556                 return bytes_read;
1557         case ISCSI_TCP_SKB_DONE:
1558                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1559                         skb, offset, offloaded);
1560                 /*
1561                  * pdus should always fit in the skb and we should get
1562                  * segment done notifcation.
1563                  */
1564                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1565                 return -EFAULT;
1566         case ISCSI_TCP_SEGMENT_DONE:
1567                 log_debug(1 << CXGBI_DBG_PDU_RX,
1568                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1569                         skb, offset, offloaded, bytes_read);
1570                 return bytes_read;
1571         default:
1572                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1573                         skb, offset, offloaded, status);
1574                 return -EINVAL;
1575         }
1576 }
1577
1578 static int
1579 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1580                  struct sk_buff *skb)
1581 {
1582         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1583         int err;
1584
1585         log_debug(1 << CXGBI_DBG_PDU_RX,
1586                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1587                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1588
1589         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1590                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1591                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1592                 return -EIO;
1593         }
1594
1595         if (conn->hdrdgst_en &&
1596             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1597                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1598                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1599                 return -EIO;
1600         }
1601
1602         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1603             cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1604                 /* If completion flag is set and data is directly
1605                  * placed in to the host memory then update
1606                  * task->exp_datasn to the datasn in completion
1607                  * iSCSI hdr as T6 adapter generates completion only
1608                  * for the last pdu of a sequence.
1609                  */
1610                 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1611                 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1612                 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1613                                                         skb->data)->datasn);
1614                 if (task && task->sc) {
1615                         struct iscsi_tcp_task *tcp_task = task->dd_data;
1616
1617                         tcp_task->exp_datasn = data_sn;
1618                 }
1619         }
1620
1621         err = read_pdu_skb(conn, skb, 0, 0);
1622         if (likely(err >= 0)) {
1623                 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1624                 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1625
1626                 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1627                         cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1628         }
1629
1630         return err;
1631 }
1632
1633 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1634                              struct sk_buff *skb, unsigned int offset)
1635 {
1636         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1637         bool offloaded = 0;
1638         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1639
1640         log_debug(1 << CXGBI_DBG_PDU_RX,
1641                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1642                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1643
1644         if (conn->datadgst_en &&
1645             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1646                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1647                         conn, lskb, cxgbi_skcb_flags(lskb));
1648                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1649                 return -EIO;
1650         }
1651
1652         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1653                 return 0;
1654
1655         /* coalesced, add header digest length */
1656         if (lskb == skb && conn->hdrdgst_en)
1657                 offset += ISCSI_DIGEST_SIZE;
1658
1659         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1660                 offloaded = 1;
1661
1662         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1663                 log_debug(1 << CXGBI_DBG_PDU_RX,
1664                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1665                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1666                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1667
1668         return read_pdu_skb(conn, skb, offset, offloaded);
1669 }
1670
1671 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1672 {
1673         struct cxgbi_device *cdev = csk->cdev;
1674         int must_send;
1675         u32 credits;
1676
1677         log_debug(1 << CXGBI_DBG_PDU_RX,
1678                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1679                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1680                 csk->rcv_wup, cdev->rx_credit_thres,
1681                 csk->rcv_win);
1682
1683         if (!cdev->rx_credit_thres)
1684                 return;
1685
1686         if (csk->state != CTP_ESTABLISHED)
1687                 return;
1688
1689         credits = csk->copied_seq - csk->rcv_wup;
1690         if (unlikely(!credits))
1691                 return;
1692         must_send = credits + 16384 >= csk->rcv_win;
1693         if (must_send || credits >= cdev->rx_credit_thres)
1694                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1695 }
1696
1697 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1698 {
1699         struct cxgbi_device *cdev = csk->cdev;
1700         struct iscsi_conn *conn = csk->user_data;
1701         struct sk_buff *skb;
1702         unsigned int read = 0;
1703         int err = 0;
1704
1705         log_debug(1 << CXGBI_DBG_PDU_RX,
1706                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1707
1708         if (unlikely(!conn || conn->suspend_rx)) {
1709                 log_debug(1 << CXGBI_DBG_PDU_RX,
1710                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1711                         csk, conn, conn ? conn->id : 0xFF,
1712                         conn ? conn->suspend_rx : 0xFF);
1713                 return;
1714         }
1715
1716         while (!err) {
1717                 skb = skb_peek(&csk->receive_queue);
1718                 if (!skb ||
1719                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1720                         if (skb)
1721                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1722                                         "skb 0x%p, NOT ready 0x%lx.\n",
1723                                         skb, cxgbi_skcb_flags(skb));
1724                         break;
1725                 }
1726                 __skb_unlink(skb, &csk->receive_queue);
1727
1728                 read += cxgbi_skcb_rx_pdulen(skb);
1729                 log_debug(1 << CXGBI_DBG_PDU_RX,
1730                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1731                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1732                         cxgbi_skcb_rx_pdulen(skb));
1733
1734                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1735                         err = skb_read_pdu_bhs(csk, conn, skb);
1736                         if (err < 0) {
1737                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1738                                         "f 0x%lx, plen %u.\n",
1739                                         csk, skb, skb->len,
1740                                         cxgbi_skcb_flags(skb),
1741                                         cxgbi_skcb_rx_pdulen(skb));
1742                                 goto skb_done;
1743                         }
1744                         err = skb_read_pdu_data(conn, skb, skb,
1745                                                 err + cdev->skb_rx_extra);
1746                         if (err < 0)
1747                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1748                                         "f 0x%lx, plen %u.\n",
1749                                         csk, skb, skb->len,
1750                                         cxgbi_skcb_flags(skb),
1751                                         cxgbi_skcb_rx_pdulen(skb));
1752                 } else {
1753                         err = skb_read_pdu_bhs(csk, conn, skb);
1754                         if (err < 0) {
1755                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1756                                         "f 0x%lx, plen %u.\n",
1757                                         csk, skb, skb->len,
1758                                         cxgbi_skcb_flags(skb),
1759                                         cxgbi_skcb_rx_pdulen(skb));
1760                                 goto skb_done;
1761                         }
1762
1763                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1764                                 struct sk_buff *dskb;
1765
1766                                 dskb = skb_peek(&csk->receive_queue);
1767                                 if (!dskb) {
1768                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1769                                                 " plen %u, NO data.\n",
1770                                                 csk, skb, skb->len,
1771                                                 cxgbi_skcb_flags(skb),
1772                                                 cxgbi_skcb_rx_pdulen(skb));
1773                                         err = -EIO;
1774                                         goto skb_done;
1775                                 }
1776                                 __skb_unlink(dskb, &csk->receive_queue);
1777
1778                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1779                                 if (err < 0)
1780                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1781                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1782                                                 "%u.\n",
1783                                                 csk, skb, skb->len,
1784                                                 cxgbi_skcb_flags(skb),
1785                                                 cxgbi_skcb_rx_pdulen(skb),
1786                                                 dskb, dskb->len);
1787                                 __kfree_skb(dskb);
1788                         } else
1789                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1790                 }
1791 skb_done:
1792                 __kfree_skb(skb);
1793
1794                 if (err < 0)
1795                         break;
1796         }
1797
1798         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1799         if (read) {
1800                 csk->copied_seq += read;
1801                 csk_return_rx_credits(csk, read);
1802                 conn->rxdata_octets += read;
1803         }
1804
1805         if (err < 0) {
1806                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1807                         csk, conn, err, read);
1808                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1809         }
1810 }
1811 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1812
1813 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1814                                 unsigned int offset, unsigned int *off,
1815                                 struct scatterlist **sgp)
1816 {
1817         int i;
1818         struct scatterlist *sg;
1819
1820         for_each_sg(sgl, sg, sgcnt, i) {
1821                 if (offset < sg->length) {
1822                         *off = offset;
1823                         *sgp = sg;
1824                         return 0;
1825                 }
1826                 offset -= sg->length;
1827         }
1828         return -EFAULT;
1829 }
1830
1831 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1832                                 unsigned int dlen, struct page_frag *frags,
1833                                 int frag_max)
1834 {
1835         unsigned int datalen = dlen;
1836         unsigned int sglen = sg->length - sgoffset;
1837         struct page *page = sg_page(sg);
1838         int i;
1839
1840         i = 0;
1841         do {
1842                 unsigned int copy;
1843
1844                 if (!sglen) {
1845                         sg = sg_next(sg);
1846                         if (!sg) {
1847                                 pr_warn("sg %d NULL, len %u/%u.\n",
1848                                         i, datalen, dlen);
1849                                 return -EINVAL;
1850                         }
1851                         sgoffset = 0;
1852                         sglen = sg->length;
1853                         page = sg_page(sg);
1854
1855                 }
1856                 copy = min(datalen, sglen);
1857                 if (i && page == frags[i - 1].page &&
1858                     sgoffset + sg->offset ==
1859                         frags[i - 1].offset + frags[i - 1].size) {
1860                         frags[i - 1].size += copy;
1861                 } else {
1862                         if (i >= frag_max) {
1863                                 pr_warn("too many pages %u, dlen %u.\n",
1864                                         frag_max, dlen);
1865                                 return -EINVAL;
1866                         }
1867
1868                         frags[i].page = page;
1869                         frags[i].offset = sg->offset + sgoffset;
1870                         frags[i].size = copy;
1871                         i++;
1872                 }
1873                 datalen -= copy;
1874                 sgoffset += copy;
1875                 sglen -= copy;
1876         } while (datalen);
1877
1878         return i;
1879 }
1880
1881 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1882 {
1883         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1884         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1885         struct cxgbi_device *cdev = cconn->chba->cdev;
1886         struct iscsi_conn *conn = task->conn;
1887         struct iscsi_tcp_task *tcp_task = task->dd_data;
1888         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1889         struct scsi_cmnd *sc = task->sc;
1890         struct cxgbi_sock *csk = cconn->cep->csk;
1891         struct net_device *ndev = cdev->ports[csk->port_id];
1892         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1893
1894         tcp_task->dd_data = tdata;
1895         task->hdr = NULL;
1896
1897         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1898             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1899              (opcode == ISCSI_OP_SCSI_CMD &&
1900               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1901                 /* data could goes into skb head */
1902                 headroom += min_t(unsigned int,
1903                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1904                                 conn->max_xmit_dlength);
1905
1906         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1907         if (!tdata->skb) {
1908                 ndev->stats.tx_dropped++;
1909                 return -ENOMEM;
1910         }
1911
1912         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1913
1914         if (task->sc) {
1915                 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1916         } else {
1917                 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1918                 if (!task->hdr) {
1919                         __kfree_skb(tdata->skb);
1920                         tdata->skb = NULL;
1921                         ndev->stats.tx_dropped++;
1922                         return -ENOMEM;
1923                 }
1924         }
1925         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1926
1927         /* data_out uses scsi_cmd's itt */
1928         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1929                 task_reserve_itt(task, &task->hdr->itt);
1930
1931         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1932                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1933                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1934                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1935
1936         return 0;
1937 }
1938 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1939
1940 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1941 {
1942         if (hcrc || dcrc) {
1943                 u8 submode = 0;
1944
1945                 if (hcrc)
1946                         submode |= 1;
1947                 if (dcrc)
1948                         submode |= 2;
1949                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1950         } else
1951                 cxgbi_skcb_ulp_mode(skb) = 0;
1952 }
1953
1954 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1955                               unsigned int count)
1956 {
1957         struct iscsi_conn *conn = task->conn;
1958         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1959         struct sk_buff *skb = tdata->skb;
1960         unsigned int datalen = count;
1961         int i, padlen = iscsi_padding(count);
1962         struct page *pg;
1963
1964         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1965                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1966                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1967                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1968
1969         skb_put(skb, task->hdr_len);
1970         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1971         if (!count)
1972                 return 0;
1973
1974         if (task->sc) {
1975                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1976                 struct scatterlist *sg = NULL;
1977                 int err;
1978
1979                 tdata->offset = offset;
1980                 tdata->count = count;
1981                 err = sgl_seek_offset(
1982                                         sdb->table.sgl, sdb->table.nents,
1983                                         tdata->offset, &tdata->sgoffset, &sg);
1984                 if (err < 0) {
1985                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1986                                 sdb->table.nents, tdata->offset, sdb->length);
1987                         return err;
1988                 }
1989                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1990                                         tdata->frags, MAX_PDU_FRAGS);
1991                 if (err < 0) {
1992                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1993                                 sdb->table.nents, tdata->offset, tdata->count);
1994                         return err;
1995                 }
1996                 tdata->nr_frags = err;
1997
1998                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1999                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2000                         char *dst = skb->data + task->hdr_len;
2001                         struct page_frag *frag = tdata->frags;
2002
2003                         /* data fits in the skb's headroom */
2004                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2005                                 char *src = kmap_atomic(frag->page);
2006
2007                                 memcpy(dst, src+frag->offset, frag->size);
2008                                 dst += frag->size;
2009                                 kunmap_atomic(src);
2010                         }
2011                         if (padlen) {
2012                                 memset(dst, 0, padlen);
2013                                 padlen = 0;
2014                         }
2015                         skb_put(skb, count + padlen);
2016                 } else {
2017                         /* data fit into frag_list */
2018                         for (i = 0; i < tdata->nr_frags; i++) {
2019                                 __skb_fill_page_desc(skb, i,
2020                                                 tdata->frags[i].page,
2021                                                 tdata->frags[i].offset,
2022                                                 tdata->frags[i].size);
2023                                 skb_frag_ref(skb, i);
2024                         }
2025                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2026                         skb->len += count;
2027                         skb->data_len += count;
2028                         skb->truesize += count;
2029                 }
2030
2031         } else {
2032                 pg = virt_to_page(task->data);
2033
2034                 get_page(pg);
2035                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2036                                         count);
2037                 skb->len += count;
2038                 skb->data_len += count;
2039                 skb->truesize += count;
2040         }
2041
2042         if (padlen) {
2043                 i = skb_shinfo(skb)->nr_frags;
2044                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2045                                 virt_to_page(padding), offset_in_page(padding),
2046                                 padlen);
2047
2048                 skb->data_len += padlen;
2049                 skb->truesize += padlen;
2050                 skb->len += padlen;
2051         }
2052
2053         return 0;
2054 }
2055 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2056
2057 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2058 {
2059         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2060         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2061         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2062         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2063         struct sk_buff *skb = tdata->skb;
2064         struct cxgbi_sock *csk = NULL;
2065         unsigned int datalen;
2066         int err;
2067
2068         if (!skb) {
2069                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2070                         "task 0x%p\n", task);
2071                 return 0;
2072         }
2073
2074         if (cconn && cconn->cep)
2075                 csk = cconn->cep->csk;
2076         if (!csk) {
2077                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2078                           "task 0x%p, csk gone.\n", task);
2079                 return -EPIPE;
2080         }
2081
2082         tdata->skb = NULL;
2083         datalen = skb->data_len;
2084
2085         /* write ppod first if using ofldq to write ppod */
2086         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2087                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2088
2089                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2090                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2091                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2092                                task);
2093                         /* continue. Let fl get the data */
2094         }
2095
2096         if (!task->sc)
2097                 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2098
2099         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2100         if (err > 0) {
2101                 int pdulen = err;
2102
2103                 log_debug(1 << CXGBI_DBG_PDU_TX,
2104                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2105                         task, task->sc, skb, skb->len, skb->data_len, err);
2106
2107                 if (task->conn->hdrdgst_en)
2108                         pdulen += ISCSI_DIGEST_SIZE;
2109
2110                 if (datalen && task->conn->datadgst_en)
2111                         pdulen += ISCSI_DIGEST_SIZE;
2112
2113                 task->conn->txdata_octets += pdulen;
2114                 return 0;
2115         }
2116
2117         if (err == -EAGAIN || err == -ENOBUFS) {
2118                 log_debug(1 << CXGBI_DBG_PDU_TX,
2119                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2120                         task, skb, skb->len, skb->data_len, err);
2121                 /* reset skb to send when we are called again */
2122                 tdata->skb = skb;
2123                 return err;
2124         }
2125
2126         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2127                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2128                 task->itt, skb, skb->len, skb->data_len, err);
2129
2130         __kfree_skb(skb);
2131
2132         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2133         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2134         return err;
2135 }
2136 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2137
2138 void cxgbi_cleanup_task(struct iscsi_task *task)
2139 {
2140         struct iscsi_tcp_task *tcp_task = task->dd_data;
2141         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2142
2143         if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2144                 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2145                         task, task->sc, tcp_task,
2146                         tcp_task ? tcp_task->dd_data : NULL, tdata);
2147                 return;
2148         }
2149
2150         log_debug(1 << CXGBI_DBG_ISCSI,
2151                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2152                 task, tdata->skb, task->hdr_itt);
2153
2154         tcp_task->dd_data = NULL;
2155
2156         if (!task->sc)
2157                 kfree(task->hdr);
2158         task->hdr = NULL;
2159
2160         /*  never reached the xmit task callout */
2161         if (tdata->skb) {
2162                 __kfree_skb(tdata->skb);
2163                 tdata->skb = NULL;
2164         }
2165
2166         task_release_itt(task, task->hdr_itt);
2167         memset(tdata, 0, sizeof(*tdata));
2168
2169         iscsi_tcp_cleanup_task(task);
2170 }
2171 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2172
2173 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2174                                 struct iscsi_stats *stats)
2175 {
2176         struct iscsi_conn *conn = cls_conn->dd_data;
2177
2178         stats->txdata_octets = conn->txdata_octets;
2179         stats->rxdata_octets = conn->rxdata_octets;
2180         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2181         stats->dataout_pdus = conn->dataout_pdus_cnt;
2182         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2183         stats->datain_pdus = conn->datain_pdus_cnt;
2184         stats->r2t_pdus = conn->r2t_pdus_cnt;
2185         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2186         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2187         stats->digest_err = 0;
2188         stats->timeout_err = 0;
2189         stats->custom_length = 1;
2190         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2191         stats->custom[0].value = conn->eh_abort_cnt;
2192 }
2193 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2194
2195 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2196 {
2197         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2198         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2199         struct cxgbi_device *cdev = cconn->chba->cdev;
2200         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2201         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2202         unsigned int max = max(max_def, headroom);
2203
2204         max = min(cconn->chba->cdev->tx_max_size, max);
2205         if (conn->max_xmit_dlength)
2206                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2207         else
2208                 conn->max_xmit_dlength = max;
2209         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2210
2211         return 0;
2212 }
2213
2214 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2215 {
2216         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2217         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2218         unsigned int max = cconn->chba->cdev->rx_max_size;
2219
2220         cxgbi_align_pdu_size(max);
2221
2222         if (conn->max_recv_dlength) {
2223                 if (conn->max_recv_dlength > max) {
2224                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2225                                 conn->max_recv_dlength, max);
2226                         return -EINVAL;
2227                 }
2228                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2229                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2230         } else
2231                 conn->max_recv_dlength = max;
2232
2233         return 0;
2234 }
2235
2236 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2237                         enum iscsi_param param, char *buf, int buflen)
2238 {
2239         struct iscsi_conn *conn = cls_conn->dd_data;
2240         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2241         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2242         struct cxgbi_sock *csk = cconn->cep->csk;
2243         int err;
2244
2245         log_debug(1 << CXGBI_DBG_ISCSI,
2246                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2247                 cls_conn, param, buflen, buf);
2248
2249         switch (param) {
2250         case ISCSI_PARAM_HDRDGST_EN:
2251                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2252                 if (!err && conn->hdrdgst_en)
2253                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2254                                                         conn->hdrdgst_en,
2255                                                         conn->datadgst_en, 0);
2256                 break;
2257         case ISCSI_PARAM_DATADGST_EN:
2258                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2259                 if (!err && conn->datadgst_en)
2260                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2261                                                         conn->hdrdgst_en,
2262                                                         conn->datadgst_en, 0);
2263                 break;
2264         case ISCSI_PARAM_MAX_R2T:
2265                 return iscsi_tcp_set_max_r2t(conn, buf);
2266         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2267                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2268                 if (!err)
2269                         err = cxgbi_conn_max_recv_dlength(conn);
2270                 break;
2271         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2272                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2273                 if (!err)
2274                         err = cxgbi_conn_max_xmit_dlength(conn);
2275                 break;
2276         default:
2277                 return iscsi_set_param(cls_conn, param, buf, buflen);
2278         }
2279         return err;
2280 }
2281 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2282
2283 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2284 {
2285         int len;
2286
2287         cxgbi_sock_get(csk);
2288         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2289         cxgbi_sock_put(csk);
2290
2291         return len;
2292 }
2293
2294 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2295 {
2296         int len;
2297
2298         cxgbi_sock_get(csk);
2299         if (csk->csk_family == AF_INET)
2300                 len = sprintf(buf, "%pI4",
2301                               &csk->daddr.sin_addr.s_addr);
2302         else
2303                 len = sprintf(buf, "%pI6",
2304                               &csk->daddr6.sin6_addr);
2305
2306         cxgbi_sock_put(csk);
2307
2308         return len;
2309 }
2310
2311 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2312                        char *buf)
2313 {
2314         struct cxgbi_endpoint *cep = ep->dd_data;
2315         struct cxgbi_sock *csk;
2316         int len;
2317
2318         log_debug(1 << CXGBI_DBG_ISCSI,
2319                 "cls_conn 0x%p, param %d.\n", ep, param);
2320
2321         switch (param) {
2322         case ISCSI_PARAM_CONN_PORT:
2323         case ISCSI_PARAM_CONN_ADDRESS:
2324                 if (!cep)
2325                         return -ENOTCONN;
2326
2327                 csk = cep->csk;
2328                 if (!csk)
2329                         return -ENOTCONN;
2330
2331                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2332                                                  &csk->daddr, param, buf);
2333         default:
2334                 return -ENOSYS;
2335         }
2336         return len;
2337 }
2338 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2339
2340 struct iscsi_cls_conn *
2341 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2342 {
2343         struct iscsi_cls_conn *cls_conn;
2344         struct iscsi_conn *conn;
2345         struct iscsi_tcp_conn *tcp_conn;
2346         struct cxgbi_conn *cconn;
2347
2348         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2349         if (!cls_conn)
2350                 return NULL;
2351
2352         conn = cls_conn->dd_data;
2353         tcp_conn = conn->dd_data;
2354         cconn = tcp_conn->dd_data;
2355         cconn->iconn = conn;
2356
2357         log_debug(1 << CXGBI_DBG_ISCSI,
2358                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2359                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2360
2361         return cls_conn;
2362 }
2363 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2364
2365 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2366                                 struct iscsi_cls_conn *cls_conn,
2367                                 u64 transport_eph, int is_leading)
2368 {
2369         struct iscsi_conn *conn = cls_conn->dd_data;
2370         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2371         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2372         struct cxgbi_ppm *ppm;
2373         struct iscsi_endpoint *ep;
2374         struct cxgbi_endpoint *cep;
2375         struct cxgbi_sock *csk;
2376         int err;
2377
2378         ep = iscsi_lookup_endpoint(transport_eph);
2379         if (!ep)
2380                 return -EINVAL;
2381
2382         /*  setup ddp pagesize */
2383         cep = ep->dd_data;
2384         csk = cep->csk;
2385
2386         ppm = csk->cdev->cdev2ppm(csk->cdev);
2387         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2388                                              ppm->tformat.pgsz_idx_dflt, 0);
2389         if (err < 0)
2390                 return err;
2391
2392         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2393         if (err)
2394                 return -EINVAL;
2395
2396         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2397         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2398
2399         write_lock_bh(&csk->callback_lock);
2400         csk->user_data = conn;
2401         cconn->chba = cep->chba;
2402         cconn->cep = cep;
2403         cep->cconn = cconn;
2404         write_unlock_bh(&csk->callback_lock);
2405
2406         cxgbi_conn_max_xmit_dlength(conn);
2407         cxgbi_conn_max_recv_dlength(conn);
2408
2409         log_debug(1 << CXGBI_DBG_ISCSI,
2410                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2411                 cls_session, cls_conn, ep, cconn, csk);
2412         /*  init recv engine */
2413         iscsi_tcp_hdr_recv_prep(tcp_conn);
2414
2415         return 0;
2416 }
2417 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2418
2419 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2420                                                 u16 cmds_max, u16 qdepth,
2421                                                 u32 initial_cmdsn)
2422 {
2423         struct cxgbi_endpoint *cep;
2424         struct cxgbi_hba *chba;
2425         struct Scsi_Host *shost;
2426         struct iscsi_cls_session *cls_session;
2427         struct iscsi_session *session;
2428
2429         if (!ep) {
2430                 pr_err("missing endpoint.\n");
2431                 return NULL;
2432         }
2433
2434         cep = ep->dd_data;
2435         chba = cep->chba;
2436         shost = chba->shost;
2437
2438         BUG_ON(chba != iscsi_host_priv(shost));
2439
2440         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2441                                         cmds_max, 0,
2442                                         sizeof(struct iscsi_tcp_task) +
2443                                         sizeof(struct cxgbi_task_data),
2444                                         initial_cmdsn, ISCSI_MAX_TARGET);
2445         if (!cls_session)
2446                 return NULL;
2447
2448         session = cls_session->dd_data;
2449         if (iscsi_tcp_r2tpool_alloc(session))
2450                 goto remove_session;
2451
2452         log_debug(1 << CXGBI_DBG_ISCSI,
2453                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2454         return cls_session;
2455
2456 remove_session:
2457         iscsi_session_teardown(cls_session);
2458         return NULL;
2459 }
2460 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2461
2462 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2463 {
2464         log_debug(1 << CXGBI_DBG_ISCSI,
2465                 "cls sess 0x%p.\n", cls_session);
2466
2467         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2468         iscsi_session_teardown(cls_session);
2469 }
2470 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2471
2472 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2473                         char *buf, int buflen)
2474 {
2475         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2476
2477         if (!chba->ndev) {
2478                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2479                                 "netdev for host not set.\n");
2480                 return -ENODEV;
2481         }
2482
2483         log_debug(1 << CXGBI_DBG_ISCSI,
2484                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2485                 shost, chba, chba->ndev->name, param, buflen, buf);
2486
2487         switch (param) {
2488         case ISCSI_HOST_PARAM_IPADDRESS:
2489         {
2490                 __be32 addr = in_aton(buf);
2491                 log_debug(1 << CXGBI_DBG_ISCSI,
2492                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2493                 cxgbi_set_iscsi_ipv4(chba, addr);
2494                 return 0;
2495         }
2496         case ISCSI_HOST_PARAM_HWADDRESS:
2497         case ISCSI_HOST_PARAM_NETDEV_NAME:
2498                 return 0;
2499         default:
2500                 return iscsi_host_set_param(shost, param, buf, buflen);
2501         }
2502 }
2503 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2504
2505 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2506                         char *buf)
2507 {
2508         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2509         int len = 0;
2510
2511         if (!chba->ndev) {
2512                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2513                                 "netdev for host not set.\n");
2514                 return -ENODEV;
2515         }
2516
2517         log_debug(1 << CXGBI_DBG_ISCSI,
2518                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2519                 shost, chba, chba->ndev->name, param);
2520
2521         switch (param) {
2522         case ISCSI_HOST_PARAM_HWADDRESS:
2523                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2524                 break;
2525         case ISCSI_HOST_PARAM_NETDEV_NAME:
2526                 len = sprintf(buf, "%s\n", chba->ndev->name);
2527                 break;
2528         case ISCSI_HOST_PARAM_IPADDRESS:
2529         {
2530                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2531                                                            chba->port_id);
2532                 if (csk) {
2533                         len = sprintf(buf, "%pIS",
2534                                       (struct sockaddr *)&csk->saddr);
2535                 }
2536                 log_debug(1 << CXGBI_DBG_ISCSI,
2537                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2538                 break;
2539         }
2540         default:
2541                 return iscsi_host_get_param(shost, param, buf);
2542         }
2543
2544         return len;
2545 }
2546 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2547
2548 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2549                                         struct sockaddr *dst_addr,
2550                                         int non_blocking)
2551 {
2552         struct iscsi_endpoint *ep;
2553         struct cxgbi_endpoint *cep;
2554         struct cxgbi_hba *hba = NULL;
2555         struct cxgbi_sock *csk;
2556         int ifindex = 0;
2557         int err = -EINVAL;
2558
2559         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2560                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2561                 shost, non_blocking, dst_addr);
2562
2563         if (shost) {
2564                 hba = iscsi_host_priv(shost);
2565                 if (!hba) {
2566                         pr_info("shost 0x%p, priv NULL.\n", shost);
2567                         goto err_out;
2568                 }
2569
2570                 rtnl_lock();
2571                 if (!vlan_uses_dev(hba->ndev))
2572                         ifindex = hba->ndev->ifindex;
2573                 rtnl_unlock();
2574         }
2575
2576         if (dst_addr->sa_family == AF_INET) {
2577                 csk = cxgbi_check_route(dst_addr, ifindex);
2578 #if IS_ENABLED(CONFIG_IPV6)
2579         } else if (dst_addr->sa_family == AF_INET6) {
2580                 csk = cxgbi_check_route6(dst_addr, ifindex);
2581 #endif
2582         } else {
2583                 pr_info("address family 0x%x NOT supported.\n",
2584                         dst_addr->sa_family);
2585                 err = -EAFNOSUPPORT;
2586                 return (struct iscsi_endpoint *)ERR_PTR(err);
2587         }
2588
2589         if (IS_ERR(csk))
2590                 return (struct iscsi_endpoint *)csk;
2591         cxgbi_sock_get(csk);
2592
2593         if (!hba)
2594                 hba = csk->cdev->hbas[csk->port_id];
2595         else if (hba != csk->cdev->hbas[csk->port_id]) {
2596                 pr_info("Could not connect through requested host %u"
2597                         "hba 0x%p != 0x%p (%u).\n",
2598                         shost->host_no, hba,
2599                         csk->cdev->hbas[csk->port_id], csk->port_id);
2600                 err = -ENOSPC;
2601                 goto release_conn;
2602         }
2603
2604         err = sock_get_port(csk);
2605         if (err)
2606                 goto release_conn;
2607
2608         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2609         err = csk->cdev->csk_init_act_open(csk);
2610         if (err)
2611                 goto release_conn;
2612
2613         if (cxgbi_sock_is_closing(csk)) {
2614                 err = -ENOSPC;
2615                 pr_info("csk 0x%p is closing.\n", csk);
2616                 goto release_conn;
2617         }
2618
2619         ep = iscsi_create_endpoint(sizeof(*cep));
2620         if (!ep) {
2621                 err = -ENOMEM;
2622                 pr_info("iscsi alloc ep, OOM.\n");
2623                 goto release_conn;
2624         }
2625
2626         cep = ep->dd_data;
2627         cep->csk = csk;
2628         cep->chba = hba;
2629
2630         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2631                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2632                 ep, cep, csk, hba, hba->ndev->name);
2633         return ep;
2634
2635 release_conn:
2636         cxgbi_sock_put(csk);
2637         cxgbi_sock_closed(csk);
2638 err_out:
2639         return ERR_PTR(err);
2640 }
2641 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2642
2643 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2644 {
2645         struct cxgbi_endpoint *cep = ep->dd_data;
2646         struct cxgbi_sock *csk = cep->csk;
2647
2648         if (!cxgbi_sock_is_established(csk))
2649                 return 0;
2650         return 1;
2651 }
2652 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2653
2654 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2655 {
2656         struct cxgbi_endpoint *cep = ep->dd_data;
2657         struct cxgbi_conn *cconn = cep->cconn;
2658         struct cxgbi_sock *csk = cep->csk;
2659
2660         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2661                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2662                 ep, cep, cconn, csk, csk->state, csk->flags);
2663
2664         if (cconn && cconn->iconn) {
2665                 iscsi_suspend_tx(cconn->iconn);
2666                 write_lock_bh(&csk->callback_lock);
2667                 cep->csk->user_data = NULL;
2668                 cconn->cep = NULL;
2669                 write_unlock_bh(&csk->callback_lock);
2670         }
2671         iscsi_destroy_endpoint(ep);
2672
2673         if (likely(csk->state >= CTP_ESTABLISHED))
2674                 need_active_close(csk);
2675         else
2676                 cxgbi_sock_closed(csk);
2677
2678         cxgbi_sock_put(csk);
2679 }
2680 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2681
2682 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2683                         struct scsi_transport_template **stt)
2684 {
2685         *stt = iscsi_register_transport(itp);
2686         if (*stt == NULL) {
2687                 pr_err("unable to register %s transport 0x%p.\n",
2688                         itp->name, itp);
2689                 return -ENODEV;
2690         }
2691         log_debug(1 << CXGBI_DBG_ISCSI,
2692                 "%s, registered iscsi transport 0x%p.\n",
2693                 itp->name, stt);
2694         return 0;
2695 }
2696 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2697
2698 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2699                         struct scsi_transport_template **stt)
2700 {
2701         if (*stt) {
2702                 log_debug(1 << CXGBI_DBG_ISCSI,
2703                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2704                         itp, itp->name, *stt);
2705                 *stt = NULL;
2706                 iscsi_unregister_transport(itp);
2707         }
2708 }
2709 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2710
2711 umode_t cxgbi_attr_is_visible(int param_type, int param)
2712 {
2713         switch (param_type) {
2714         case ISCSI_HOST_PARAM:
2715                 switch (param) {
2716                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2717                 case ISCSI_HOST_PARAM_HWADDRESS:
2718                 case ISCSI_HOST_PARAM_IPADDRESS:
2719                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2720                         return S_IRUGO;
2721                 default:
2722                         return 0;
2723                 }
2724         case ISCSI_PARAM:
2725                 switch (param) {
2726                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2727                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2728                 case ISCSI_PARAM_HDRDGST_EN:
2729                 case ISCSI_PARAM_DATADGST_EN:
2730                 case ISCSI_PARAM_CONN_ADDRESS:
2731                 case ISCSI_PARAM_CONN_PORT:
2732                 case ISCSI_PARAM_EXP_STATSN:
2733                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2734                 case ISCSI_PARAM_PERSISTENT_PORT:
2735                 case ISCSI_PARAM_PING_TMO:
2736                 case ISCSI_PARAM_RECV_TMO:
2737                 case ISCSI_PARAM_INITIAL_R2T_EN:
2738                 case ISCSI_PARAM_MAX_R2T:
2739                 case ISCSI_PARAM_IMM_DATA_EN:
2740                 case ISCSI_PARAM_FIRST_BURST:
2741                 case ISCSI_PARAM_MAX_BURST:
2742                 case ISCSI_PARAM_PDU_INORDER_EN:
2743                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2744                 case ISCSI_PARAM_ERL:
2745                 case ISCSI_PARAM_TARGET_NAME:
2746                 case ISCSI_PARAM_TPGT:
2747                 case ISCSI_PARAM_USERNAME:
2748                 case ISCSI_PARAM_PASSWORD:
2749                 case ISCSI_PARAM_USERNAME_IN:
2750                 case ISCSI_PARAM_PASSWORD_IN:
2751                 case ISCSI_PARAM_FAST_ABORT:
2752                 case ISCSI_PARAM_ABORT_TMO:
2753                 case ISCSI_PARAM_LU_RESET_TMO:
2754                 case ISCSI_PARAM_TGT_RESET_TMO:
2755                 case ISCSI_PARAM_IFACE_NAME:
2756                 case ISCSI_PARAM_INITIATOR_NAME:
2757                         return S_IRUGO;
2758                 default:
2759                         return 0;
2760                 }
2761         }
2762
2763         return 0;
2764 }
2765 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2766
2767 static int __init libcxgbi_init_module(void)
2768 {
2769         pr_info("%s", version);
2770
2771         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2772                      sizeof(struct cxgbi_skb_cb));
2773         return 0;
2774 }
2775
2776 static void __exit libcxgbi_exit_module(void)
2777 {
2778         cxgbi_device_unregister_all(0xFF);
2779         return;
2780 }
2781
2782 module_init(libcxgbi_init_module);
2783 module_exit(libcxgbi_exit_module);