drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010-2015 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <net/ipv6.h>
  28 #include <net/ip6_route.h>
  29 #include <net/addrconf.h>
  30
  31 #include <linux/inetdevice.h>   /* ip_dev_find */
  32 #include <linux/module.h>
  33 #include <net/tcp.h>
  34
  35 static unsigned int dbg_level;
  36
  37 #include "libcxgbi.h"
  38
  39 #define DRV_MODULE_NAME         "libcxgbi"
  40 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  41 #define DRV_MODULE_VERSION      "0.9.1-ko"
  42 #define DRV_MODULE_RELDATE      "Apr. 2015"
  43
  44 static char version[] =
  45         DRV_MODULE_DESC " " DRV_MODULE_NAME
  46         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  47
  48 MODULE_AUTHOR("Chelsio Communications, Inc.");
  49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  50 MODULE_VERSION(DRV_MODULE_VERSION);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(dbg_level, uint, 0644);
  54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  55
  56
  57 /*
  58  * cxgbi device management
  59  * maintains a list of the cxgbi devices
  60  */
  61 static LIST_HEAD(cdev_list);
  62 static DEFINE_MUTEX(cdev_mutex);
  63
  64 static LIST_HEAD(cdev_rcu_list);
  65 static DEFINE_SPINLOCK(cdev_rcu_lock);
  66
  67 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         if (cdev->cdev2ppm)
 125                 cxgbi_ppm_release(cdev->cdev2ppm(cdev));
 126         if (cdev->pmap.max_connect)
 127                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 128         kfree(cdev);
 129 }
 130
 131 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 132                                            unsigned int nports)
 133 {
 134         struct cxgbi_device *cdev;
 135
 136         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 137                         (sizeof(struct cxgbi_hba *) +
 138                          sizeof(struct net_device *)),
 139                         GFP_KERNEL);
 140         if (!cdev) {
 141                 pr_warn("nport %d, OOM.\n", nports);
 142                 return NULL;
 143         }
 144         cdev->ports = (struct net_device **)(cdev + 1);
 145         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 146                                                 sizeof(struct net_device *));
 147         if (extra)
 148                 cdev->dd_data = ((char *)cdev->hbas) +
 149                                 nports * sizeof(struct cxgbi_hba *);
 150         spin_lock_init(&cdev->pmap.lock);
 151
 152         mutex_lock(&cdev_mutex);
 153         list_add_tail(&cdev->list_head, &cdev_list);
 154         mutex_unlock(&cdev_mutex);
 155
 156         spin_lock(&cdev_rcu_lock);
 157         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 158         spin_unlock(&cdev_rcu_lock);
 159
 160         log_debug(1 << CXGBI_DBG_DEV,
 161                 "cdev 0x%p, p# %u.\n", cdev, nports);
 162         return cdev;
 163 }
 164 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 165
 166 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 167 {
 168         log_debug(1 << CXGBI_DBG_DEV,
 169                 "cdev 0x%p, p# %u,%s.\n",
 170                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 171
 172         mutex_lock(&cdev_mutex);
 173         list_del(&cdev->list_head);
 174         mutex_unlock(&cdev_mutex);
 175
 176         spin_lock(&cdev_rcu_lock);
 177         list_del_rcu(&cdev->rcu_node);
 178         spin_unlock(&cdev_rcu_lock);
 179         synchronize_rcu();
 180
 181         cxgbi_device_destroy(cdev);
 182 }
 183 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 184
 185 void cxgbi_device_unregister_all(unsigned int flag)
 186 {
 187         struct cxgbi_device *cdev, *tmp;
 188
 189         mutex_lock(&cdev_mutex);
 190         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 191                 if ((cdev->flags & flag) == flag) {
 192                         mutex_unlock(&cdev_mutex);
 193                         cxgbi_device_unregister(cdev);
 194                         mutex_lock(&cdev_mutex);
 195                 }
 196         }
 197         mutex_unlock(&cdev_mutex);
 198 }
 199 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 200
 201 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 202 {
 203         struct cxgbi_device *cdev, *tmp;
 204
 205         mutex_lock(&cdev_mutex);
 206         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 207                 if (cdev->lldev == lldev) {
 208                         mutex_unlock(&cdev_mutex);
 209                         return cdev;
 210                 }
 211         }
 212         mutex_unlock(&cdev_mutex);
 213
 214         log_debug(1 << CXGBI_DBG_DEV,
 215                 "lldev 0x%p, NO match found.\n", lldev);
 216         return NULL;
 217 }
 218 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 219
 220 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 221                                                  int *port)
 222 {
 223         struct net_device *vdev = NULL;
 224         struct cxgbi_device *cdev, *tmp;
 225         int i;
 226
 227         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 228                 vdev = ndev;
 229                 ndev = vlan_dev_real_dev(ndev);
 230                 log_debug(1 << CXGBI_DBG_DEV,
 231                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 232         }
 233
 234         mutex_lock(&cdev_mutex);
 235         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 236                 for (i = 0; i < cdev->nports; i++) {
 237                         if (ndev == cdev->ports[i]) {
 238                                 cdev->hbas[i]->vdev = vdev;
 239                                 mutex_unlock(&cdev_mutex);
 240                                 if (port)
 241                                         *port = i;
 242                                 return cdev;
 243                         }
 244                 }
 245         }
 246         mutex_unlock(&cdev_mutex);
 247         log_debug(1 << CXGBI_DBG_DEV,
 248                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 249         return NULL;
 250 }
 251 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 252
 253 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 254                                                      int *port)
 255 {
 256         struct net_device *vdev = NULL;
 257         struct cxgbi_device *cdev;
 258         int i;
 259
 260         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 261                 vdev = ndev;
 262                 ndev = vlan_dev_real_dev(ndev);
 263                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 264         }
 265
 266         rcu_read_lock();
 267         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 268                 for (i = 0; i < cdev->nports; i++) {
 269                         if (ndev == cdev->ports[i]) {
 270                                 cdev->hbas[i]->vdev = vdev;
 271                                 rcu_read_unlock();
 272                                 if (port)
 273                                         *port = i;
 274                                 return cdev;
 275                         }
 276                 }
 277         }
 278         rcu_read_unlock();
 279
 280         log_debug(1 << CXGBI_DBG_DEV,
 281                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 282         return NULL;
 283 }
 284 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 285
 286 #if IS_ENABLED(CONFIG_IPV6)
 287 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 288                                                      int *port)
 289 {
 290         struct net_device *vdev = NULL;
 291         struct cxgbi_device *cdev, *tmp;
 292         int i;
 293
 294         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 295                 vdev = ndev;
 296                 ndev = vlan_dev_real_dev(ndev);
 297                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 298         }
 299
 300         mutex_lock(&cdev_mutex);
 301         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 302                 for (i = 0; i < cdev->nports; i++) {
 303                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 304                                     MAX_ADDR_LEN)) {
 305                                 cdev->hbas[i]->vdev = vdev;
 306                                 mutex_unlock(&cdev_mutex);
 307                                 if (port)
 308                                         *port = i;
 309                                 return cdev;
 310                         }
 311                 }
 312         }
 313         mutex_unlock(&cdev_mutex);
 314         log_debug(1 << CXGBI_DBG_DEV,
 315                   "ndev 0x%p, %s, NO match mac found.\n",
 316                   ndev, ndev->name);
 317         return NULL;
 318 }
 319 #endif
 320
 321 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 322 {
 323         int i;
 324         struct cxgbi_hba *chba;
 325
 326         log_debug(1 << CXGBI_DBG_DEV,
 327                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 328
 329         for (i = 0; i < cdev->nports; i++) {
 330                 chba = cdev->hbas[i];
 331                 if (chba) {
 332                         cdev->hbas[i] = NULL;
 333                         iscsi_host_remove(chba->shost);
 334                         pci_dev_put(cdev->pdev);
 335                         iscsi_host_free(chba->shost);
 336                 }
 337         }
 338 }
 339 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 340
 341 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 342                 unsigned int max_id, struct scsi_host_template *sht,
 343                 struct scsi_transport_template *stt)
 344 {
 345         struct cxgbi_hba *chba;
 346         struct Scsi_Host *shost;
 347         int i, err;
 348
 349         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 350
 351         for (i = 0; i < cdev->nports; i++) {
 352                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 353                 if (!shost) {
 354                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 355                                 cdev, i, cdev->ports[i]->name);
 356                         err = -ENOMEM;
 357                         goto err_out;
 358                 }
 359
 360                 shost->transportt = stt;
 361                 shost->max_lun = max_lun;
 362                 shost->max_id = max_id;
 363                 shost->max_channel = 0;
 364                 shost->max_cmd_len = 16;
 365
 366                 chba = iscsi_host_priv(shost);
 367                 chba->cdev = cdev;
 368                 chba->ndev = cdev->ports[i];
 369                 chba->shost = shost;
 370
 371                 log_debug(1 << CXGBI_DBG_DEV,
 372                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 373                         cdev, i, cdev->ports[i]->name, chba);
 374
 375                 pci_dev_get(cdev->pdev);
 376                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 377                 if (err) {
 378                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 379                                 cdev, i, cdev->ports[i]->name);
 380                         pci_dev_put(cdev->pdev);
 381                         scsi_host_put(shost);
 382                         goto  err_out;
 383                 }
 384
 385                 cdev->hbas[i] = chba;
 386         }
 387
 388         return 0;
 389
 390 err_out:
 391         cxgbi_hbas_remove(cdev);
 392         return err;
 393 }
 394 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 395
 396 /*
 397  * iSCSI offload
 398  *
 399  * - source port management
 400  *   To find a free source port in the port allocation map we use a very simple
 401  *   rotor scheme to look for the next free port.
 402  *
 403  *   If a source port has been specified make sure that it doesn't collide with
 404  *   our normal source port allocation map.  If it's outside the range of our
 405  *   allocation/deallocation scheme just let them use it.
 406  *
 407  *   If the source port is outside our allocation range, the caller is
 408  *   responsible for keeping track of their port usage.
 409  */
 410
 411 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 412                                             unsigned char port_id)
 413 {
 414         struct cxgbi_ports_map *pmap = &cdev->pmap;
 415         unsigned int i;
 416         unsigned int used;
 417
 418         if (!pmap->max_connect || !pmap->used)
 419                 return NULL;
 420
 421         spin_lock_bh(&pmap->lock);
 422         used = pmap->used;
 423         for (i = 0; used && i < pmap->max_connect; i++) {
 424                 struct cxgbi_sock *csk = pmap->port_csk[i];
 425
 426                 if (csk) {
 427                         if (csk->port_id == port_id) {
 428                                 spin_unlock_bh(&pmap->lock);
 429                                 return csk;
 430                         }
 431                         used--;
 432                 }
 433         }
 434         spin_unlock_bh(&pmap->lock);
 435
 436         return NULL;
 437 }
 438
 439 static int sock_get_port(struct cxgbi_sock *csk)
 440 {
 441         struct cxgbi_device *cdev = csk->cdev;
 442         struct cxgbi_ports_map *pmap = &cdev->pmap;
 443         unsigned int start;
 444         int idx;
 445         __be16 *port;
 446
 447         if (!pmap->max_connect) {
 448                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 449                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 450                 return -EADDRNOTAVAIL;
 451         }
 452
 453         if (csk->csk_family == AF_INET)
 454                 port = &csk->saddr.sin_port;
 455         else /* ipv6 */
 456                 port = &csk->saddr6.sin6_port;
 457
 458         if (*port) {
 459                 pr_err("source port NON-ZERO %u.\n",
 460                         ntohs(*port));
 461                 return -EADDRINUSE;
 462         }
 463
 464         spin_lock_bh(&pmap->lock);
 465         if (pmap->used >= pmap->max_connect) {
 466                 spin_unlock_bh(&pmap->lock);
 467                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 468                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 469                 return -EADDRNOTAVAIL;
 470         }
 471
 472         start = idx = pmap->next;
 473         do {
 474                 if (++idx >= pmap->max_connect)
 475                         idx = 0;
 476                 if (!pmap->port_csk[idx]) {
 477                         pmap->used++;
 478                         *port = htons(pmap->sport_base + idx);
 479                         pmap->next = idx;
 480                         pmap->port_csk[idx] = csk;
 481                         spin_unlock_bh(&pmap->lock);
 482                         cxgbi_sock_get(csk);
 483                         log_debug(1 << CXGBI_DBG_SOCK,
 484                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 485                                 cdev, csk->port_id,
 486                                 cdev->ports[csk->port_id]->name,
 487                                 pmap->sport_base + idx, pmap->next);
 488                         return 0;
 489                 }
 490         } while (idx != start);
 491         spin_unlock_bh(&pmap->lock);
 492
 493         /* should not happen */
 494         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 495                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 496                 pmap->next);
 497         return -EADDRNOTAVAIL;
 498 }
 499
 500 static void sock_put_port(struct cxgbi_sock *csk)
 501 {
 502         struct cxgbi_device *cdev = csk->cdev;
 503         struct cxgbi_ports_map *pmap = &cdev->pmap;
 504         __be16 *port;
 505
 506         if (csk->csk_family == AF_INET)
 507                 port = &csk->saddr.sin_port;
 508         else /* ipv6 */
 509                 port = &csk->saddr6.sin6_port;
 510
 511         if (*port) {
 512                 int idx = ntohs(*port) - pmap->sport_base;
 513
 514                 *port = 0;
 515                 if (idx < 0 || idx >= pmap->max_connect) {
 516                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 517                                 cdev, csk->port_id,
 518                                 cdev->ports[csk->port_id]->name,
 519                                 ntohs(*port));
 520                         return;
 521                 }
 522
 523                 spin_lock_bh(&pmap->lock);
 524                 pmap->port_csk[idx] = NULL;
 525                 pmap->used--;
 526                 spin_unlock_bh(&pmap->lock);
 527
 528                 log_debug(1 << CXGBI_DBG_SOCK,
 529                         "cdev 0x%p, p#%u %s, release %u.\n",
 530                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 531                         pmap->sport_base + idx);
 532
 533                 cxgbi_sock_put(csk);
 534         }
 535 }
 536
 537 /*
 538  * iscsi tcp connection
 539  */
 540 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 541 {
 542         if (csk->cpl_close) {
 543                 kfree_skb(csk->cpl_close);
 544                 csk->cpl_close = NULL;
 545         }
 546         if (csk->cpl_abort_req) {
 547                 kfree_skb(csk->cpl_abort_req);
 548                 csk->cpl_abort_req = NULL;
 549         }
 550         if (csk->cpl_abort_rpl) {
 551                 kfree_skb(csk->cpl_abort_rpl);
 552                 csk->cpl_abort_rpl = NULL;
 553         }
 554 }
 555 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 556
 557 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 558 {
 559         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 560
 561         if (!csk) {
 562                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 563                 return NULL;
 564         }
 565
 566         if (cdev->csk_alloc_cpls(csk) < 0) {
 567                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 568                 kfree(csk);
 569                 return NULL;
 570         }
 571
 572         spin_lock_init(&csk->lock);
 573         kref_init(&csk->refcnt);
 574         skb_queue_head_init(&csk->receive_queue);
 575         skb_queue_head_init(&csk->write_queue);
 576         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 577         rwlock_init(&csk->callback_lock);
 578         csk->cdev = cdev;
 579         csk->flags = 0;
 580         cxgbi_sock_set_state(csk, CTP_CLOSED);
 581
 582         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 583
 584         return csk;
 585 }
 586
 587 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 588                                       __be32 saddr, __be32 daddr,
 589                                       __be16 sport, __be16 dport, u8 tos)
 590 {
 591         struct rtable *rt;
 592
 593         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 594                                    dport, sport, IPPROTO_TCP, tos, 0);
 595         if (IS_ERR(rt))
 596                 return NULL;
 597
 598         return rt;
 599 }
 600
 601 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 602 {
 603         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 604         struct dst_entry *dst;
 605         struct net_device *ndev;
 606         struct cxgbi_device *cdev;
 607         struct rtable *rt = NULL;
 608         struct neighbour *n;
 609         struct flowi4 fl4;
 610         struct cxgbi_sock *csk = NULL;
 611         unsigned int mtu = 0;
 612         int port = 0xFFFF;
 613         int err = 0;
 614
 615         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 616         if (!rt) {
 617                 pr_info("no route to ipv4 0x%x, port %u.\n",
 618                         be32_to_cpu(daddr->sin_addr.s_addr),
 619                         be16_to_cpu(daddr->sin_port));
 620                 err = -ENETUNREACH;
 621                 goto err_out;
 622         }
 623         dst = &rt->dst;
 624         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 625         if (!n) {
 626                 err = -ENODEV;
 627                 goto rel_rt;
 628         }
 629         ndev = n->dev;
 630
 631         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 632                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 633                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 634                         ndev->name);
 635                 err = -ENETUNREACH;
 636                 goto rel_neigh;
 637         }
 638
 639         if (ndev->flags & IFF_LOOPBACK) {
 640                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 641                 if (!ndev) {
 642                         err = -ENETUNREACH;
 643                         goto rel_neigh;
 644                 }
 645                 mtu = ndev->mtu;
 646                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 647                         n->dev->name, ndev->name, mtu);
 648         }
 649
 650         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 651         if (!cdev) {
 652                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 653                         &daddr->sin_addr.s_addr, ndev->name);
 654                 err = -ENETUNREACH;
 655                 goto rel_neigh;
 656         }
 657         log_debug(1 << CXGBI_DBG_SOCK,
 658                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 659                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 660                            port, ndev->name, cdev);
 661
 662         csk = cxgbi_sock_create(cdev);
 663         if (!csk) {
 664                 err = -ENOMEM;
 665                 goto rel_neigh;
 666         }
 667         csk->cdev = cdev;
 668         csk->port_id = port;
 669         csk->mtu = mtu;
 670         csk->dst = dst;
 671
 672         csk->csk_family = AF_INET;
 673         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 674         csk->daddr.sin_port = daddr->sin_port;
 675         csk->daddr.sin_family = daddr->sin_family;
 676         csk->saddr.sin_family = daddr->sin_family;
 677         csk->saddr.sin_addr.s_addr = fl4.saddr;
 678         neigh_release(n);
 679
 680         return csk;
 681
 682 rel_neigh:
 683         neigh_release(n);
 684
 685 rel_rt:
 686         ip_rt_put(rt);
 687         if (csk)
 688                 cxgbi_sock_closed(csk);
 689 err_out:
 690         return ERR_PTR(err);
 691 }
 692
 693 #if IS_ENABLED(CONFIG_IPV6)
 694 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 695                                         const struct in6_addr *daddr)
 696 {
 697         struct flowi6 fl;
 698
 699         memset(&fl, 0, sizeof(fl));
 700         if (saddr)
 701                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 702         if (daddr)
 703                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 704         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 705 }
 706
 707 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 708 {
 709         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 710         struct dst_entry *dst;
 711         struct net_device *ndev;
 712         struct cxgbi_device *cdev;
 713         struct rt6_info *rt = NULL;
 714         struct neighbour *n;
 715         struct in6_addr pref_saddr;
 716         struct cxgbi_sock *csk = NULL;
 717         unsigned int mtu = 0;
 718         int port = 0xFFFF;
 719         int err = 0;
 720
 721         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 722
 723         if (!rt) {
 724                 pr_info("no route to ipv6 %pI6 port %u\n",
 725                         daddr6->sin6_addr.s6_addr,
 726                         be16_to_cpu(daddr6->sin6_port));
 727                 err = -ENETUNREACH;
 728                 goto err_out;
 729         }
 730
 731         dst = &rt->dst;
 732
 733         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 734
 735         if (!n) {
 736                 pr_info("%pI6, port %u, dst no neighbour.\n",
 737                         daddr6->sin6_addr.s6_addr,
 738                         be16_to_cpu(daddr6->sin6_port));
 739                 err = -ENETUNREACH;
 740                 goto rel_rt;
 741         }
 742         ndev = n->dev;
 743
 744         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 745                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 746                         daddr6->sin6_addr.s6_addr,
 747                         ntohs(daddr6->sin6_port), ndev->name);
 748                 err = -ENETUNREACH;
 749                 goto rel_rt;
 750         }
 751
 752         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 753         if (!cdev)
 754                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 755         if (!cdev) {
 756                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 757                         daddr6->sin6_addr.s6_addr, ndev->name);
 758                 err = -ENETUNREACH;
 759                 goto rel_rt;
 760         }
 761         log_debug(1 << CXGBI_DBG_SOCK,
 762                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 763                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 764                   ndev->name, cdev);
 765
 766         csk = cxgbi_sock_create(cdev);
 767         if (!csk) {
 768                 err = -ENOMEM;
 769                 goto rel_rt;
 770         }
 771         csk->cdev = cdev;
 772         csk->port_id = port;
 773         csk->mtu = mtu;
 774         csk->dst = dst;
 775
 776         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 777                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 778
 779                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 780                                          &daddr6->sin6_addr, 0, &pref_saddr);
 781                 if (err) {
 782                         pr_info("failed to get source address to reach %pI6\n",
 783                                 &daddr6->sin6_addr);
 784                         goto rel_rt;
 785                 }
 786         } else {
 787                 pref_saddr = rt->rt6i_prefsrc.addr;
 788         }
 789
 790         csk->csk_family = AF_INET6;
 791         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 792         csk->daddr6.sin6_port = daddr6->sin6_port;
 793         csk->daddr6.sin6_family = daddr6->sin6_family;
 794         csk->saddr6.sin6_family = daddr6->sin6_family;
 795         csk->saddr6.sin6_addr = pref_saddr;
 796
 797         neigh_release(n);
 798         return csk;
 799
 800 rel_rt:
 801         if (n)
 802                 neigh_release(n);
 803
 804         ip6_rt_put(rt);
 805         if (csk)
 806                 cxgbi_sock_closed(csk);
 807 err_out:
 808         return ERR_PTR(err);
 809 }
 810 #endif /* IS_ENABLED(CONFIG_IPV6) */
 811
 812 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 813                         unsigned int opt)
 814 {
 815         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 816         dst_confirm(csk->dst);
 817         smp_mb();
 818         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 819 }
 820 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 821
 822 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 823 {
 824         log_debug(1 << CXGBI_DBG_SOCK,
 825                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 826                 csk, csk->state, csk->flags, csk->user_data);
 827
 828         if (csk->state != CTP_ESTABLISHED) {
 829                 read_lock_bh(&csk->callback_lock);
 830                 if (csk->user_data)
 831                         iscsi_conn_failure(csk->user_data,
 832                                         ISCSI_ERR_TCP_CONN_CLOSE);
 833                 read_unlock_bh(&csk->callback_lock);
 834         }
 835 }
 836
 837 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 838 {
 839         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 840                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 841         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 842         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 843                 return;
 844         if (csk->saddr.sin_port)
 845                 sock_put_port(csk);
 846         if (csk->dst)
 847                 dst_release(csk->dst);
 848         csk->cdev->csk_release_offload_resources(csk);
 849         cxgbi_sock_set_state(csk, CTP_CLOSED);
 850         cxgbi_inform_iscsi_conn_closing(csk);
 851         cxgbi_sock_put(csk);
 852 }
 853 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 854
 855 static void need_active_close(struct cxgbi_sock *csk)
 856 {
 857         int data_lost;
 858         int close_req = 0;
 859
 860         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 861                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 862         spin_lock_bh(&csk->lock);
 863         dst_confirm(csk->dst);
 864         data_lost = skb_queue_len(&csk->receive_queue);
 865         __skb_queue_purge(&csk->receive_queue);
 866
 867         if (csk->state == CTP_ACTIVE_OPEN)
 868                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 869         else if (csk->state == CTP_ESTABLISHED) {
 870                 close_req = 1;
 871                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 872         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 873                 close_req = 1;
 874                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 875         }
 876
 877         if (close_req) {
 878                 if (data_lost)
 879                         csk->cdev->csk_send_abort_req(csk);
 880                 else
 881                         csk->cdev->csk_send_close_req(csk);
 882         }
 883
 884         spin_unlock_bh(&csk->lock);
 885 }
 886
 887 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 888 {
 889         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 890                         csk, csk->state, csk->flags,
 891                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 892                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 893                         errno);
 894
 895         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 896         csk->err = errno;
 897         cxgbi_sock_closed(csk);
 898 }
 899 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 900
 901 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 902 {
 903         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 904
 905         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 906                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 907         cxgbi_sock_get(csk);
 908         spin_lock_bh(&csk->lock);
 909         if (csk->state == CTP_ACTIVE_OPEN)
 910                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 911         spin_unlock_bh(&csk->lock);
 912         cxgbi_sock_put(csk);
 913         __kfree_skb(skb);
 914 }
 915 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 916
 917 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 918 {
 919         cxgbi_sock_get(csk);
 920         spin_lock_bh(&csk->lock);
 921
 922         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 923         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 924                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 925                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 926                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 927                                csk, csk->state, csk->flags, csk->tid);
 928                 cxgbi_sock_closed(csk);
 929         }
 930
 931         spin_unlock_bh(&csk->lock);
 932         cxgbi_sock_put(csk);
 933 }
 934 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 935
 936 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 937 {
 938         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 939                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 940         cxgbi_sock_get(csk);
 941         spin_lock_bh(&csk->lock);
 942
 943         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 944                 goto done;
 945
 946         switch (csk->state) {
 947         case CTP_ESTABLISHED:
 948                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 949                 break;
 950         case CTP_ACTIVE_CLOSE:
 951                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 952                 break;
 953         case CTP_CLOSE_WAIT_1:
 954                 cxgbi_sock_closed(csk);
 955                 break;
 956         case CTP_ABORTING:
 957                 break;
 958         default:
 959                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 960                         csk, csk->state, csk->flags, csk->tid);
 961         }
 962         cxgbi_inform_iscsi_conn_closing(csk);
 963 done:
 964         spin_unlock_bh(&csk->lock);
 965         cxgbi_sock_put(csk);
 966 }
 967 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 968
 969 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 970 {
 971         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 972                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 973         cxgbi_sock_get(csk);
 974         spin_lock_bh(&csk->lock);
 975
 976         csk->snd_una = snd_nxt - 1;
 977         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 978                 goto done;
 979
 980         switch (csk->state) {
 981         case CTP_ACTIVE_CLOSE:
 982                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 983                 break;
 984         case CTP_CLOSE_WAIT_1:
 985         case CTP_CLOSE_WAIT_2:
 986                 cxgbi_sock_closed(csk);
 987                 break;
 988         case CTP_ABORTING:
 989                 break;
 990         default:
 991                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 992                         csk, csk->state, csk->flags, csk->tid);
 993         }
 994 done:
 995         spin_unlock_bh(&csk->lock);
 996         cxgbi_sock_put(csk);
 997 }
 998 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 999
1000 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1001                            unsigned int snd_una, int seq_chk)
1002 {
1003         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1004                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1005                         csk, csk->state, csk->flags, csk->tid, credits,
1006                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1007
1008         spin_lock_bh(&csk->lock);
1009
1010         csk->wr_cred += credits;
1011         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1012                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1013
1014         while (credits) {
1015                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1016
1017                 if (unlikely(!p)) {
1018                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1019                                 csk, csk->state, csk->flags, csk->tid, credits,
1020                                 csk->wr_cred, csk->wr_una_cred);
1021                         break;
1022                 }
1023
1024                 if (unlikely(credits < p->csum)) {
1025                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1026                                 csk, csk->state, csk->flags, csk->tid,
1027                                 credits, csk->wr_cred, csk->wr_una_cred,
1028                                 p->csum);
1029                         p->csum -= credits;
1030                         break;
1031                 } else {
1032                         cxgbi_sock_dequeue_wr(csk);
1033                         credits -= p->csum;
1034                         kfree_skb(p);
1035                 }
1036         }
1037
1038         cxgbi_sock_check_wr_invariants(csk);
1039
1040         if (seq_chk) {
1041                 if (unlikely(before(snd_una, csk->snd_una))) {
1042                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1043                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1044                                 csk->snd_una);
1045                         goto done;
1046                 }
1047
1048                 if (csk->snd_una != snd_una) {
1049                         csk->snd_una = snd_una;
1050                         dst_confirm(csk->dst);
1051                 }
1052         }
1053
1054         if (skb_queue_len(&csk->write_queue)) {
1055                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1056                         cxgbi_conn_tx_open(csk);
1057         } else
1058                 cxgbi_conn_tx_open(csk);
1059 done:
1060         spin_unlock_bh(&csk->lock);
1061 }
1062 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1063
1064 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1065                                              unsigned short mtu)
1066 {
1067         int i = 0;
1068
1069         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1070                 ++i;
1071
1072         return i;
1073 }
1074
1075 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1076 {
1077         unsigned int idx;
1078         struct dst_entry *dst = csk->dst;
1079
1080         csk->advmss = dst_metric_advmss(dst);
1081
1082         if (csk->advmss > pmtu - 40)
1083                 csk->advmss = pmtu - 40;
1084         if (csk->advmss < csk->cdev->mtus[0] - 40)
1085                 csk->advmss = csk->cdev->mtus[0] - 40;
1086         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1087
1088         return idx;
1089 }
1090 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1091
1092 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1093 {
1094         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1095         __skb_queue_tail(&csk->write_queue, skb);
1096 }
1097 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1098
1099 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1100 {
1101         struct sk_buff *skb;
1102
1103         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1104                 kfree_skb(skb);
1105 }
1106 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1107
1108 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1109 {
1110         int pending = cxgbi_sock_count_pending_wrs(csk);
1111
1112         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1113                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1114                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1115 }
1116 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1117
1118 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1119 {
1120         struct cxgbi_device *cdev = csk->cdev;
1121         struct sk_buff *next;
1122         int err, copied = 0;
1123
1124         spin_lock_bh(&csk->lock);
1125
1126         if (csk->state != CTP_ESTABLISHED) {
1127                 log_debug(1 << CXGBI_DBG_PDU_TX,
1128                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1129                         csk, csk->state, csk->flags, csk->tid);
1130                 err = -EAGAIN;
1131                 goto out_err;
1132         }
1133
1134         if (csk->err) {
1135                 log_debug(1 << CXGBI_DBG_PDU_TX,
1136                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1137                         csk, csk->state, csk->flags, csk->tid, csk->err);
1138                 err = -EPIPE;
1139                 goto out_err;
1140         }
1141
1142         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1143                 log_debug(1 << CXGBI_DBG_PDU_TX,
1144                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1145                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1146                         csk->snd_una, csk->snd_win);
1147                 err = -ENOBUFS;
1148                 goto out_err;
1149         }
1150
1151         while (skb) {
1152                 int frags = skb_shinfo(skb)->nr_frags +
1153                                 (skb->len != skb->data_len);
1154
1155                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1156                         pr_err("csk 0x%p, skb head %u < %u.\n",
1157                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1158                         err = -EINVAL;
1159                         goto out_err;
1160                 }
1161
1162                 if (frags >= SKB_WR_LIST_SIZE) {
1163                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1164                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1165                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1166                         err = -EINVAL;
1167                         goto out_err;
1168                 }
1169
1170                 next = skb->next;
1171                 skb->next = NULL;
1172                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1173                 cxgbi_sock_skb_entail(csk, skb);
1174                 copied += skb->len;
1175                 csk->write_seq += skb->len +
1176                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1177                 skb = next;
1178         }
1179 done:
1180         if (likely(skb_queue_len(&csk->write_queue)))
1181                 cdev->csk_push_tx_frames(csk, 1);
1182         spin_unlock_bh(&csk->lock);
1183         return copied;
1184
1185 out_err:
1186         if (copied == 0 && err == -EPIPE)
1187                 copied = csk->err ? csk->err : -EPIPE;
1188         else
1189                 copied = err;
1190         goto done;
1191 }
1192
1193 static inline void
1194 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1195                 unsigned int *sgcnt, unsigned int *dlen,
1196                 unsigned int prot)
1197 {
1198         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1199
1200         *sgl = sdb->table.sgl;
1201         *sgcnt = sdb->table.nents;
1202         *dlen = sdb->length;
1203         /* Caution: for protection sdb, sdb->length is invalid */
1204 }
1205
1206 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1207                             struct cxgbi_task_tag_info *ttinfo,
1208                             struct scatterlist **sg_pp, unsigned int *sg_off)
1209 {
1210         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1211         unsigned int offset = sg_off ? *sg_off : 0;
1212         dma_addr_t addr = 0UL;
1213         unsigned int len = 0;
1214         int i;
1215
1216         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1217
1218         if (sg) {
1219                 addr = sg_dma_address(sg);
1220                 len = sg_dma_len(sg);
1221         }
1222
1223         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1224                 if (sg) {
1225                         ppod->addr[i] = cpu_to_be64(addr + offset);
1226                         offset += PAGE_SIZE;
1227                         if (offset == (len + sg->offset)) {
1228                                 offset = 0;
1229                                 sg = sg_next(sg);
1230                                 if (sg) {
1231                                         addr = sg_dma_address(sg);
1232                                         len = sg_dma_len(sg);
1233                                 }
1234                         }
1235                 } else {
1236                         ppod->addr[i] = 0ULL;
1237                 }
1238         }
1239
1240         /*
1241          * the fifth address needs to be repeated in the next ppod, so do
1242          * not move sg
1243          */
1244         if (sg_pp) {
1245                 *sg_pp = sg;
1246                 *sg_off = offset;
1247         }
1248
1249         if (offset == len) {
1250                 offset = 0;
1251                 sg = sg_next(sg);
1252                 if (sg) {
1253                         addr = sg_dma_address(sg);
1254                         len = sg_dma_len(sg);
1255                 }
1256         }
1257         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1258 }
1259 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1260
1261 /*
1262  * APIs interacting with open-iscsi libraries
1263  */
1264
1265 static unsigned char padding[4];
1266
1267 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1268                          struct cxgbi_tag_format *tformat, unsigned int ppmax,
1269                          unsigned int llimit, unsigned int start,
1270                          unsigned int rsvd_factor)
1271 {
1272         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1273                                 cdev->lldev, tformat, ppmax, llimit, start,
1274                                 rsvd_factor);
1275
1276         if (err >= 0) {
1277                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1278
1279                 if (ppm->ppmax < 1024 ||
1280                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1281                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1282                 err = 0;
1283         } else {
1284                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1285         }
1286 }
1287 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1288
1289 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1290 {
1291         int i;
1292         int last_sgidx = nents - 1;
1293         struct scatterlist *sg = sgl;
1294
1295         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1296                 unsigned int len = sg->length + sg->offset;
1297
1298                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1299                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1300                         log_debug(1 << CXGBI_DBG_DDP,
1301                                   "sg %u/%u, %u,%u, not aligned.\n",
1302                                   i, nents, sg->offset, sg->length);
1303                         goto err_out;
1304                 }
1305         }
1306         return 0;
1307 err_out:
1308         return -EINVAL;
1309 }
1310
1311 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1312                              struct cxgbi_task_data *tdata, u32 sw_tag,
1313                              unsigned int xferlen)
1314 {
1315         struct cxgbi_sock *csk = cconn->cep->csk;
1316         struct cxgbi_device *cdev = csk->cdev;
1317         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1318         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1319         struct scatterlist *sgl = ttinfo->sgl;
1320         unsigned int sgcnt = ttinfo->nents;
1321         unsigned int sg_offset = sgl->offset;
1322         int err;
1323
1324         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1325                 log_debug(1 << CXGBI_DBG_DDP,
1326                           "cdev 0x%p DDP off.\n", cdev);
1327                 return -EINVAL;
1328         }
1329
1330         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1331             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1332                 log_debug(1 << CXGBI_DBG_DDP,
1333                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1334                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1335                           xferlen, ttinfo->nents);
1336                 return -EINVAL;
1337         }
1338
1339         /* make sure the buffer is suitable for ddp */
1340         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1341                 return -EINVAL;
1342
1343         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1344                             PAGE_SHIFT;
1345
1346         /*
1347          * the ddp tag will be used for the itt in the outgoing pdu,
1348          * the itt genrated by libiscsi is saved in the ppm and can be
1349          * retrieved via the ddp tag
1350          */
1351         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1352                                       &ttinfo->tag, (unsigned long)sw_tag);
1353         if (err < 0) {
1354                 cconn->ddp_full++;
1355                 return err;
1356         }
1357         ttinfo->npods = err;
1358
1359          /* setup dma from scsi command sgl */
1360         sgl->offset = 0;
1361         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1362         sgl->offset = sg_offset;
1363         if (err == 0) {
1364                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1365                         __func__, sw_tag, xferlen, sgcnt);
1366                 goto rel_ppods;
1367         }
1368         if (err != ttinfo->nr_pages) {
1369                 log_debug(1 << CXGBI_DBG_DDP,
1370                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1371                           __func__, sw_tag, xferlen, sgcnt, err);
1372         }
1373
1374         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1375         ttinfo->cid = csk->port_id;
1376
1377         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1378                                 xferlen, &ttinfo->hdr);
1379
1380         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1381                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1382                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1383         } else {
1384                 /* write ppod from control queue now */
1385                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1386                 if (err < 0)
1387                         goto rel_ppods;
1388         }
1389
1390         return 0;
1391
1392 rel_ppods:
1393         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1394
1395         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1396                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1397                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1398         }
1399         return -EINVAL;
1400 }
1401
1402 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1403 {
1404         struct scsi_cmnd *sc = task->sc;
1405         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1406         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1407         struct cxgbi_device *cdev = cconn->chba->cdev;
1408         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1409         u32 tag = ntohl((__force u32)hdr_itt);
1410
1411         log_debug(1 << CXGBI_DBG_DDP,
1412                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1413                   cdev, task, tag);
1414         if (sc &&
1415             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1416             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1417                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1418                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1419
1420                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1421                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1422                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1423                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1424                              DMA_FROM_DEVICE);
1425         }
1426 }
1427
1428 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1429 {
1430         /* assume idx and age both are < 0x7FFF (32767) */
1431         return (idx << 16) | age;
1432 }
1433
1434 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1435 {
1436         struct scsi_cmnd *sc = task->sc;
1437         struct iscsi_conn *conn = task->conn;
1438         struct iscsi_session *sess = conn->session;
1439         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1440         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1441         struct cxgbi_device *cdev = cconn->chba->cdev;
1442         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1443         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1444         u32 tag = 0;
1445         int err = -EINVAL;
1446
1447         if (sc &&
1448             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1449         ) {
1450                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1451                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1452
1453                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1454                                 &tdata->dlen, 0);
1455                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1456                 if (!err)
1457                         tag = ttinfo->tag;
1458                 else
1459                          log_debug(1 << CXGBI_DBG_DDP,
1460                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1461                                    cconn->cep->csk, task, tdata->dlen,
1462                                    ttinfo->nents);
1463         }
1464
1465         if (err < 0) {
1466                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1467                 if (err < 0)
1468                         return err;
1469         }
1470         /*  the itt need to sent in big-endian order */
1471         *hdr_itt = (__force itt_t)htonl(tag);
1472
1473         log_debug(1 << CXGBI_DBG_DDP,
1474                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1475                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1476         return 0;
1477 }
1478
1479 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1480 {
1481         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1482         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1483         struct cxgbi_device *cdev = cconn->chba->cdev;
1484         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1485         u32 tag = ntohl((__force u32)itt);
1486         u32 sw_bits;
1487
1488         if (ppm) {
1489                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1490                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1491                 else
1492                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1493         } else {
1494                 sw_bits = tag;
1495         }
1496
1497         cxgbi_decode_sw_tag(sw_bits, idx, age);
1498         log_debug(1 << CXGBI_DBG_DDP,
1499                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1500                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1501                   age ? *age : 0xFF);
1502 }
1503 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1504
1505 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1506 {
1507         struct iscsi_conn *conn = csk->user_data;
1508
1509         if (conn) {
1510                 log_debug(1 << CXGBI_DBG_SOCK,
1511                         "csk 0x%p, cid %d.\n", csk, conn->id);
1512                 iscsi_conn_queue_work(conn);
1513         }
1514 }
1515 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1516
1517 /*
1518  * pdu receive, interact with libiscsi_tcp
1519  */
1520 static inline int read_pdu_skb(struct iscsi_conn *conn,
1521                                struct sk_buff *skb,
1522                                unsigned int offset,
1523                                int offloaded)
1524 {
1525         int status = 0;
1526         int bytes_read;
1527
1528         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1529         switch (status) {
1530         case ISCSI_TCP_CONN_ERR:
1531                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1532                           skb, offset, offloaded);
1533                 return -EIO;
1534         case ISCSI_TCP_SUSPENDED:
1535                 log_debug(1 << CXGBI_DBG_PDU_RX,
1536                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1537                         skb, offset, offloaded, bytes_read);
1538                 /* no transfer - just have caller flush queue */
1539                 return bytes_read;
1540         case ISCSI_TCP_SKB_DONE:
1541                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1542                         skb, offset, offloaded);
1543                 /*
1544                  * pdus should always fit in the skb and we should get
1545                  * segment done notifcation.
1546                  */
1547                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1548                 return -EFAULT;
1549         case ISCSI_TCP_SEGMENT_DONE:
1550                 log_debug(1 << CXGBI_DBG_PDU_RX,
1551                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1552                         skb, offset, offloaded, bytes_read);
1553                 return bytes_read;
1554         default:
1555                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1556                         skb, offset, offloaded, status);
1557                 return -EINVAL;
1558         }
1559 }
1560
1561 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1562 {
1563         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1564
1565         log_debug(1 << CXGBI_DBG_PDU_RX,
1566                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1567                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1568
1569         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1570                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1571                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1572                 return -EIO;
1573         }
1574
1575         if (conn->hdrdgst_en &&
1576             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1577                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1578                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1579                 return -EIO;
1580         }
1581
1582         return read_pdu_skb(conn, skb, 0, 0);
1583 }
1584
1585 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1586                              struct sk_buff *skb, unsigned int offset)
1587 {
1588         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1589         bool offloaded = 0;
1590         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1591
1592         log_debug(1 << CXGBI_DBG_PDU_RX,
1593                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1594                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1595
1596         if (conn->datadgst_en &&
1597             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1598                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1599                         conn, lskb, cxgbi_skcb_flags(lskb));
1600                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1601                 return -EIO;
1602         }
1603
1604         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1605                 return 0;
1606
1607         /* coalesced, add header digest length */
1608         if (lskb == skb && conn->hdrdgst_en)
1609                 offset += ISCSI_DIGEST_SIZE;
1610
1611         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1612                 offloaded = 1;
1613
1614         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1615                 log_debug(1 << CXGBI_DBG_PDU_RX,
1616                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1617                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1618                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1619
1620         return read_pdu_skb(conn, skb, offset, offloaded);
1621 }
1622
1623 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1624 {
1625         struct cxgbi_device *cdev = csk->cdev;
1626         int must_send;
1627         u32 credits;
1628
1629         log_debug(1 << CXGBI_DBG_PDU_RX,
1630                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1631                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1632                 csk->rcv_wup, cdev->rx_credit_thres,
1633                 csk->rcv_win);
1634
1635         if (csk->state != CTP_ESTABLISHED)
1636                 return;
1637
1638         credits = csk->copied_seq - csk->rcv_wup;
1639         if (unlikely(!credits))
1640                 return;
1641         if (unlikely(cdev->rx_credit_thres == 0))
1642                 return;
1643
1644         must_send = credits + 16384 >= csk->rcv_win;
1645         if (must_send || credits >= cdev->rx_credit_thres)
1646                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1647 }
1648
1649 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1650 {
1651         struct cxgbi_device *cdev = csk->cdev;
1652         struct iscsi_conn *conn = csk->user_data;
1653         struct sk_buff *skb;
1654         unsigned int read = 0;
1655         int err = 0;
1656
1657         log_debug(1 << CXGBI_DBG_PDU_RX,
1658                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1659
1660         if (unlikely(!conn || conn->suspend_rx)) {
1661                 log_debug(1 << CXGBI_DBG_PDU_RX,
1662                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1663                         csk, conn, conn ? conn->id : 0xFF,
1664                         conn ? conn->suspend_rx : 0xFF);
1665                 return;
1666         }
1667
1668         while (!err) {
1669                 skb = skb_peek(&csk->receive_queue);
1670                 if (!skb ||
1671                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1672                         if (skb)
1673                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1674                                         "skb 0x%p, NOT ready 0x%lx.\n",
1675                                         skb, cxgbi_skcb_flags(skb));
1676                         break;
1677                 }
1678                 __skb_unlink(skb, &csk->receive_queue);
1679
1680                 read += cxgbi_skcb_rx_pdulen(skb);
1681                 log_debug(1 << CXGBI_DBG_PDU_RX,
1682                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1683                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1684                         cxgbi_skcb_rx_pdulen(skb));
1685
1686                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1687                         err = skb_read_pdu_bhs(conn, skb);
1688                         if (err < 0) {
1689                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1690                                         "f 0x%lx, plen %u.\n",
1691                                         csk, skb, skb->len,
1692                                         cxgbi_skcb_flags(skb),
1693                                         cxgbi_skcb_rx_pdulen(skb));
1694                                 goto skb_done;
1695                         }
1696                         err = skb_read_pdu_data(conn, skb, skb,
1697                                                 err + cdev->skb_rx_extra);
1698                         if (err < 0)
1699                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1700                                         "f 0x%lx, plen %u.\n",
1701                                         csk, skb, skb->len,
1702                                         cxgbi_skcb_flags(skb),
1703                                         cxgbi_skcb_rx_pdulen(skb));
1704                 } else {
1705                         err = skb_read_pdu_bhs(conn, skb);
1706                         if (err < 0) {
1707                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1708                                         "f 0x%lx, plen %u.\n",
1709                                         csk, skb, skb->len,
1710                                         cxgbi_skcb_flags(skb),
1711                                         cxgbi_skcb_rx_pdulen(skb));
1712                                 goto skb_done;
1713                         }
1714
1715                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1716                                 struct sk_buff *dskb;
1717
1718                                 dskb = skb_peek(&csk->receive_queue);
1719                                 if (!dskb) {
1720                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1721                                                 " plen %u, NO data.\n",
1722                                                 csk, skb, skb->len,
1723                                                 cxgbi_skcb_flags(skb),
1724                                                 cxgbi_skcb_rx_pdulen(skb));
1725                                         err = -EIO;
1726                                         goto skb_done;
1727                                 }
1728                                 __skb_unlink(dskb, &csk->receive_queue);
1729
1730                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1731                                 if (err < 0)
1732                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1733                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1734                                                 "%u.\n",
1735                                                 csk, skb, skb->len,
1736                                                 cxgbi_skcb_flags(skb),
1737                                                 cxgbi_skcb_rx_pdulen(skb),
1738                                                 dskb, dskb->len);
1739                                 __kfree_skb(dskb);
1740                         } else
1741                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1742                 }
1743 skb_done:
1744                 __kfree_skb(skb);
1745
1746                 if (err < 0)
1747                         break;
1748         }
1749
1750         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1751         if (read) {
1752                 csk->copied_seq += read;
1753                 csk_return_rx_credits(csk, read);
1754                 conn->rxdata_octets += read;
1755         }
1756
1757         if (err < 0) {
1758                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1759                         csk, conn, err, read);
1760                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1761         }
1762 }
1763 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1764
1765 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1766                                 unsigned int offset, unsigned int *off,
1767                                 struct scatterlist **sgp)
1768 {
1769         int i;
1770         struct scatterlist *sg;
1771
1772         for_each_sg(sgl, sg, sgcnt, i) {
1773                 if (offset < sg->length) {
1774                         *off = offset;
1775                         *sgp = sg;
1776                         return 0;
1777                 }
1778                 offset -= sg->length;
1779         }
1780         return -EFAULT;
1781 }
1782
1783 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1784                                 unsigned int dlen, struct page_frag *frags,
1785                                 int frag_max)
1786 {
1787         unsigned int datalen = dlen;
1788         unsigned int sglen = sg->length - sgoffset;
1789         struct page *page = sg_page(sg);
1790         int i;
1791
1792         i = 0;
1793         do {
1794                 unsigned int copy;
1795
1796                 if (!sglen) {
1797                         sg = sg_next(sg);
1798                         if (!sg) {
1799                                 pr_warn("sg %d NULL, len %u/%u.\n",
1800                                         i, datalen, dlen);
1801                                 return -EINVAL;
1802                         }
1803                         sgoffset = 0;
1804                         sglen = sg->length;
1805                         page = sg_page(sg);
1806
1807                 }
1808                 copy = min(datalen, sglen);
1809                 if (i && page == frags[i - 1].page &&
1810                     sgoffset + sg->offset ==
1811                         frags[i - 1].offset + frags[i - 1].size) {
1812                         frags[i - 1].size += copy;
1813                 } else {
1814                         if (i >= frag_max) {
1815                                 pr_warn("too many pages %u, dlen %u.\n",
1816                                         frag_max, dlen);
1817                                 return -EINVAL;
1818                         }
1819
1820                         frags[i].page = page;
1821                         frags[i].offset = sg->offset + sgoffset;
1822                         frags[i].size = copy;
1823                         i++;
1824                 }
1825                 datalen -= copy;
1826                 sgoffset += copy;
1827                 sglen -= copy;
1828         } while (datalen);
1829
1830         return i;
1831 }
1832
1833 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1834 {
1835         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1836         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1837         struct cxgbi_device *cdev = cconn->chba->cdev;
1838         struct iscsi_conn *conn = task->conn;
1839         struct iscsi_tcp_task *tcp_task = task->dd_data;
1840         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1841         struct scsi_cmnd *sc = task->sc;
1842         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1843
1844         tcp_task->dd_data = tdata;
1845         task->hdr = NULL;
1846
1847         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1848             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1849              (opcode == ISCSI_OP_SCSI_CMD &&
1850               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1851                 /* data could goes into skb head */
1852                 headroom += min_t(unsigned int,
1853                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1854                                 conn->max_xmit_dlength);
1855
1856         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1857         if (!tdata->skb) {
1858                 struct cxgbi_sock *csk = cconn->cep->csk;
1859                 struct net_device *ndev = cdev->ports[csk->port_id];
1860                 ndev->stats.tx_dropped++;
1861                 return -ENOMEM;
1862         }
1863
1864         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1865         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1866         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1867
1868         /* data_out uses scsi_cmd's itt */
1869         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1870                 task_reserve_itt(task, &task->hdr->itt);
1871
1872         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1873                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1874                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1875                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1876
1877         return 0;
1878 }
1879 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1880
1881 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1882 {
1883         if (hcrc || dcrc) {
1884                 u8 submode = 0;
1885
1886                 if (hcrc)
1887                         submode |= 1;
1888                 if (dcrc)
1889                         submode |= 2;
1890                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1891         } else
1892                 cxgbi_skcb_ulp_mode(skb) = 0;
1893 }
1894
1895 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1896                               unsigned int count)
1897 {
1898         struct iscsi_conn *conn = task->conn;
1899         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1900         struct sk_buff *skb = tdata->skb;
1901         unsigned int datalen = count;
1902         int i, padlen = iscsi_padding(count);
1903         struct page *pg;
1904
1905         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1906                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1907                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1908                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1909
1910         skb_put(skb, task->hdr_len);
1911         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1912         if (!count)
1913                 return 0;
1914
1915         if (task->sc) {
1916                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1917                 struct scatterlist *sg = NULL;
1918                 int err;
1919
1920                 tdata->offset = offset;
1921                 tdata->count = count;
1922                 err = sgl_seek_offset(
1923                                         sdb->table.sgl, sdb->table.nents,
1924                                         tdata->offset, &tdata->sgoffset, &sg);
1925                 if (err < 0) {
1926                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1927                                 sdb->table.nents, tdata->offset, sdb->length);
1928                         return err;
1929                 }
1930                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1931                                         tdata->frags, MAX_PDU_FRAGS);
1932                 if (err < 0) {
1933                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1934                                 sdb->table.nents, tdata->offset, tdata->count);
1935                         return err;
1936                 }
1937                 tdata->nr_frags = err;
1938
1939                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1940                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1941                         char *dst = skb->data + task->hdr_len;
1942                         struct page_frag *frag = tdata->frags;
1943
1944                         /* data fits in the skb's headroom */
1945                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1946                                 char *src = kmap_atomic(frag->page);
1947
1948                                 memcpy(dst, src+frag->offset, frag->size);
1949                                 dst += frag->size;
1950                                 kunmap_atomic(src);
1951                         }
1952                         if (padlen) {
1953                                 memset(dst, 0, padlen);
1954                                 padlen = 0;
1955                         }
1956                         skb_put(skb, count + padlen);
1957                 } else {
1958                         /* data fit into frag_list */
1959                         for (i = 0; i < tdata->nr_frags; i++) {
1960                                 __skb_fill_page_desc(skb, i,
1961                                                 tdata->frags[i].page,
1962                                                 tdata->frags[i].offset,
1963                                                 tdata->frags[i].size);
1964                                 skb_frag_ref(skb, i);
1965                         }
1966                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1967                         skb->len += count;
1968                         skb->data_len += count;
1969                         skb->truesize += count;
1970                 }
1971
1972         } else {
1973                 pg = virt_to_page(task->data);
1974
1975                 get_page(pg);
1976                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1977                                         count);
1978                 skb->len += count;
1979                 skb->data_len += count;
1980                 skb->truesize += count;
1981         }
1982
1983         if (padlen) {
1984                 i = skb_shinfo(skb)->nr_frags;
1985                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1986                                 virt_to_page(padding), offset_in_page(padding),
1987                                 padlen);
1988
1989                 skb->data_len += padlen;
1990                 skb->truesize += padlen;
1991                 skb->len += padlen;
1992         }
1993
1994         return 0;
1995 }
1996 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
1997
1998 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
1999 {
2000         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2001         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2002         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2003         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2004         struct sk_buff *skb = tdata->skb;
2005         struct cxgbi_sock *csk = NULL;
2006         unsigned int datalen;
2007         int err;
2008
2009         if (!skb) {
2010                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2011                         "task 0x%p, skb NULL.\n", task);
2012                 return 0;
2013         }
2014
2015         if (cconn && cconn->cep)
2016                 csk = cconn->cep->csk;
2017         if (!csk) {
2018                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2019                           "task 0x%p, csk gone.\n", task);
2020                 return -EPIPE;
2021         }
2022
2023         datalen = skb->data_len;
2024         tdata->skb = NULL;
2025
2026         /* write ppod first if using ofldq to write ppod */
2027         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2028                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2029
2030                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2031                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2032                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2033                                task);
2034                         /* continue. Let fl get the data */
2035         }
2036
2037         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2038         if (err > 0) {
2039                 int pdulen = err;
2040
2041                 log_debug(1 << CXGBI_DBG_PDU_TX,
2042                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2043                         task, task->sc, skb, skb->len, skb->data_len, err);
2044
2045                 if (task->conn->hdrdgst_en)
2046                         pdulen += ISCSI_DIGEST_SIZE;
2047
2048                 if (datalen && task->conn->datadgst_en)
2049                         pdulen += ISCSI_DIGEST_SIZE;
2050
2051                 task->conn->txdata_octets += pdulen;
2052                 return 0;
2053         }
2054
2055         if (err == -EAGAIN || err == -ENOBUFS) {
2056                 log_debug(1 << CXGBI_DBG_PDU_TX,
2057                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2058                         task, skb, skb->len, skb->data_len, err);
2059                 /* reset skb to send when we are called again */
2060                 tdata->skb = skb;
2061                 return err;
2062         }
2063
2064         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2065                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2066                 task->itt, skb, skb->len, skb->data_len, err);
2067
2068         kfree_skb(skb);
2069
2070         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2071         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2072         return err;
2073 }
2074 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2075
2076 void cxgbi_cleanup_task(struct iscsi_task *task)
2077 {
2078         struct iscsi_tcp_task *tcp_task = task->dd_data;
2079         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2080
2081         log_debug(1 << CXGBI_DBG_ISCSI,
2082                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2083                 task, tdata->skb, task->hdr_itt);
2084
2085         tcp_task->dd_data = NULL;
2086         /*  never reached the xmit task callout */
2087         if (tdata->skb)
2088                 __kfree_skb(tdata->skb);
2089
2090         task_release_itt(task, task->hdr_itt);
2091         memset(tdata, 0, sizeof(*tdata));
2092
2093         iscsi_tcp_cleanup_task(task);
2094 }
2095 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2096
2097 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2098                                 struct iscsi_stats *stats)
2099 {
2100         struct iscsi_conn *conn = cls_conn->dd_data;
2101
2102         stats->txdata_octets = conn->txdata_octets;
2103         stats->rxdata_octets = conn->rxdata_octets;
2104         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2105         stats->dataout_pdus = conn->dataout_pdus_cnt;
2106         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2107         stats->datain_pdus = conn->datain_pdus_cnt;
2108         stats->r2t_pdus = conn->r2t_pdus_cnt;
2109         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2110         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2111         stats->digest_err = 0;
2112         stats->timeout_err = 0;
2113         stats->custom_length = 1;
2114         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2115         stats->custom[0].value = conn->eh_abort_cnt;
2116 }
2117 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2118
2119 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2120 {
2121         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2122         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2123         struct cxgbi_device *cdev = cconn->chba->cdev;
2124         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2125         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2126         unsigned int max = max(max_def, headroom);
2127
2128         max = min(cconn->chba->cdev->tx_max_size, max);
2129         if (conn->max_xmit_dlength)
2130                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2131         else
2132                 conn->max_xmit_dlength = max;
2133         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2134
2135         return 0;
2136 }
2137
2138 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2139 {
2140         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2141         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2142         unsigned int max = cconn->chba->cdev->rx_max_size;
2143
2144         cxgbi_align_pdu_size(max);
2145
2146         if (conn->max_recv_dlength) {
2147                 if (conn->max_recv_dlength > max) {
2148                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2149                                 conn->max_recv_dlength, max);
2150                         return -EINVAL;
2151                 }
2152                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2153                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2154         } else
2155                 conn->max_recv_dlength = max;
2156
2157         return 0;
2158 }
2159
2160 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2161                         enum iscsi_param param, char *buf, int buflen)
2162 {
2163         struct iscsi_conn *conn = cls_conn->dd_data;
2164         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2165         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2166         struct cxgbi_sock *csk = cconn->cep->csk;
2167         int err;
2168
2169         log_debug(1 << CXGBI_DBG_ISCSI,
2170                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2171                 cls_conn, param, buflen, buf);
2172
2173         switch (param) {
2174         case ISCSI_PARAM_HDRDGST_EN:
2175                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2176                 if (!err && conn->hdrdgst_en)
2177                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2178                                                         conn->hdrdgst_en,
2179                                                         conn->datadgst_en, 0);
2180                 break;
2181         case ISCSI_PARAM_DATADGST_EN:
2182                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2183                 if (!err && conn->datadgst_en)
2184                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2185                                                         conn->hdrdgst_en,
2186                                                         conn->datadgst_en, 0);
2187                 break;
2188         case ISCSI_PARAM_MAX_R2T:
2189                 return iscsi_tcp_set_max_r2t(conn, buf);
2190         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2191                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2192                 if (!err)
2193                         err = cxgbi_conn_max_recv_dlength(conn);
2194                 break;
2195         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2196                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2197                 if (!err)
2198                         err = cxgbi_conn_max_xmit_dlength(conn);
2199                 break;
2200         default:
2201                 return iscsi_set_param(cls_conn, param, buf, buflen);
2202         }
2203         return err;
2204 }
2205 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2206
2207 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2208 {
2209         int len;
2210
2211         cxgbi_sock_get(csk);
2212         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2213         cxgbi_sock_put(csk);
2214
2215         return len;
2216 }
2217
2218 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2219 {
2220         int len;
2221
2222         cxgbi_sock_get(csk);
2223         if (csk->csk_family == AF_INET)
2224                 len = sprintf(buf, "%pI4",
2225                               &csk->daddr.sin_addr.s_addr);
2226         else
2227                 len = sprintf(buf, "%pI6",
2228                               &csk->daddr6.sin6_addr);
2229
2230         cxgbi_sock_put(csk);
2231
2232         return len;
2233 }
2234
2235 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2236                        char *buf)
2237 {
2238         struct cxgbi_endpoint *cep = ep->dd_data;
2239         struct cxgbi_sock *csk;
2240         int len;
2241
2242         log_debug(1 << CXGBI_DBG_ISCSI,
2243                 "cls_conn 0x%p, param %d.\n", ep, param);
2244
2245         switch (param) {
2246         case ISCSI_PARAM_CONN_PORT:
2247         case ISCSI_PARAM_CONN_ADDRESS:
2248                 if (!cep)
2249                         return -ENOTCONN;
2250
2251                 csk = cep->csk;
2252                 if (!csk)
2253                         return -ENOTCONN;
2254
2255                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2256                                                  &csk->daddr, param, buf);
2257         default:
2258                 return -ENOSYS;
2259         }
2260         return len;
2261 }
2262 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2263
2264 struct iscsi_cls_conn *
2265 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2266 {
2267         struct iscsi_cls_conn *cls_conn;
2268         struct iscsi_conn *conn;
2269         struct iscsi_tcp_conn *tcp_conn;
2270         struct cxgbi_conn *cconn;
2271
2272         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2273         if (!cls_conn)
2274                 return NULL;
2275
2276         conn = cls_conn->dd_data;
2277         tcp_conn = conn->dd_data;
2278         cconn = tcp_conn->dd_data;
2279         cconn->iconn = conn;
2280
2281         log_debug(1 << CXGBI_DBG_ISCSI,
2282                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2283                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2284
2285         return cls_conn;
2286 }
2287 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2288
2289 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2290                                 struct iscsi_cls_conn *cls_conn,
2291                                 u64 transport_eph, int is_leading)
2292 {
2293         struct iscsi_conn *conn = cls_conn->dd_data;
2294         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2295         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2296         struct cxgbi_ppm *ppm;
2297         struct iscsi_endpoint *ep;
2298         struct cxgbi_endpoint *cep;
2299         struct cxgbi_sock *csk;
2300         int err;
2301
2302         ep = iscsi_lookup_endpoint(transport_eph);
2303         if (!ep)
2304                 return -EINVAL;
2305
2306         /*  setup ddp pagesize */
2307         cep = ep->dd_data;
2308         csk = cep->csk;
2309
2310         ppm = csk->cdev->cdev2ppm(csk->cdev);
2311         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2312                                              ppm->tformat.pgsz_idx_dflt, 0);
2313         if (err < 0)
2314                 return err;
2315
2316         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2317         if (err)
2318                 return -EINVAL;
2319
2320         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2321         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2322
2323         write_lock_bh(&csk->callback_lock);
2324         csk->user_data = conn;
2325         cconn->chba = cep->chba;
2326         cconn->cep = cep;
2327         cep->cconn = cconn;
2328         write_unlock_bh(&csk->callback_lock);
2329
2330         cxgbi_conn_max_xmit_dlength(conn);
2331         cxgbi_conn_max_recv_dlength(conn);
2332
2333         log_debug(1 << CXGBI_DBG_ISCSI,
2334                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2335                 cls_session, cls_conn, ep, cconn, csk);
2336         /*  init recv engine */
2337         iscsi_tcp_hdr_recv_prep(tcp_conn);
2338
2339         return 0;
2340 }
2341 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2342
2343 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2344                                                 u16 cmds_max, u16 qdepth,
2345                                                 u32 initial_cmdsn)
2346 {
2347         struct cxgbi_endpoint *cep;
2348         struct cxgbi_hba *chba;
2349         struct Scsi_Host *shost;
2350         struct iscsi_cls_session *cls_session;
2351         struct iscsi_session *session;
2352
2353         if (!ep) {
2354                 pr_err("missing endpoint.\n");
2355                 return NULL;
2356         }
2357
2358         cep = ep->dd_data;
2359         chba = cep->chba;
2360         shost = chba->shost;
2361
2362         BUG_ON(chba != iscsi_host_priv(shost));
2363
2364         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2365                                         cmds_max, 0,
2366                                         sizeof(struct iscsi_tcp_task) +
2367                                         sizeof(struct cxgbi_task_data),
2368                                         initial_cmdsn, ISCSI_MAX_TARGET);
2369         if (!cls_session)
2370                 return NULL;
2371
2372         session = cls_session->dd_data;
2373         if (iscsi_tcp_r2tpool_alloc(session))
2374                 goto remove_session;
2375
2376         log_debug(1 << CXGBI_DBG_ISCSI,
2377                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2378         return cls_session;
2379
2380 remove_session:
2381         iscsi_session_teardown(cls_session);
2382         return NULL;
2383 }
2384 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2385
2386 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2387 {
2388         log_debug(1 << CXGBI_DBG_ISCSI,
2389                 "cls sess 0x%p.\n", cls_session);
2390
2391         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2392         iscsi_session_teardown(cls_session);
2393 }
2394 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2395
2396 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2397                         char *buf, int buflen)
2398 {
2399         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2400
2401         if (!chba->ndev) {
2402                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2403                                 "netdev for host not set.\n");
2404                 return -ENODEV;
2405         }
2406
2407         log_debug(1 << CXGBI_DBG_ISCSI,
2408                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2409                 shost, chba, chba->ndev->name, param, buflen, buf);
2410
2411         switch (param) {
2412         case ISCSI_HOST_PARAM_IPADDRESS:
2413         {
2414                 __be32 addr = in_aton(buf);
2415                 log_debug(1 << CXGBI_DBG_ISCSI,
2416                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2417                 cxgbi_set_iscsi_ipv4(chba, addr);
2418                 return 0;
2419         }
2420         case ISCSI_HOST_PARAM_HWADDRESS:
2421         case ISCSI_HOST_PARAM_NETDEV_NAME:
2422                 return 0;
2423         default:
2424                 return iscsi_host_set_param(shost, param, buf, buflen);
2425         }
2426 }
2427 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2428
2429 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2430                         char *buf)
2431 {
2432         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2433         int len = 0;
2434
2435         if (!chba->ndev) {
2436                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2437                                 "netdev for host not set.\n");
2438                 return -ENODEV;
2439         }
2440
2441         log_debug(1 << CXGBI_DBG_ISCSI,
2442                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2443                 shost, chba, chba->ndev->name, param);
2444
2445         switch (param) {
2446         case ISCSI_HOST_PARAM_HWADDRESS:
2447                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2448                 break;
2449         case ISCSI_HOST_PARAM_NETDEV_NAME:
2450                 len = sprintf(buf, "%s\n", chba->ndev->name);
2451                 break;
2452         case ISCSI_HOST_PARAM_IPADDRESS:
2453         {
2454                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2455                                                            chba->port_id);
2456                 if (csk) {
2457                         len = sprintf(buf, "%pIS",
2458                                       (struct sockaddr *)&csk->saddr);
2459                 }
2460                 log_debug(1 << CXGBI_DBG_ISCSI,
2461                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2462                 break;
2463         }
2464         default:
2465                 return iscsi_host_get_param(shost, param, buf);
2466         }
2467
2468         return len;
2469 }
2470 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2471
2472 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2473                                         struct sockaddr *dst_addr,
2474                                         int non_blocking)
2475 {
2476         struct iscsi_endpoint *ep;
2477         struct cxgbi_endpoint *cep;
2478         struct cxgbi_hba *hba = NULL;
2479         struct cxgbi_sock *csk;
2480         int err = -EINVAL;
2481
2482         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2483                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2484                 shost, non_blocking, dst_addr);
2485
2486         if (shost) {
2487                 hba = iscsi_host_priv(shost);
2488                 if (!hba) {
2489                         pr_info("shost 0x%p, priv NULL.\n", shost);
2490                         goto err_out;
2491                 }
2492         }
2493
2494         if (dst_addr->sa_family == AF_INET) {
2495                 csk = cxgbi_check_route(dst_addr);
2496 #if IS_ENABLED(CONFIG_IPV6)
2497         } else if (dst_addr->sa_family == AF_INET6) {
2498                 csk = cxgbi_check_route6(dst_addr);
2499 #endif
2500         } else {
2501                 pr_info("address family 0x%x NOT supported.\n",
2502                         dst_addr->sa_family);
2503                 err = -EAFNOSUPPORT;
2504                 return (struct iscsi_endpoint *)ERR_PTR(err);
2505         }
2506
2507         if (IS_ERR(csk))
2508                 return (struct iscsi_endpoint *)csk;
2509         cxgbi_sock_get(csk);
2510
2511         if (!hba)
2512                 hba = csk->cdev->hbas[csk->port_id];
2513         else if (hba != csk->cdev->hbas[csk->port_id]) {
2514                 pr_info("Could not connect through requested host %u"
2515                         "hba 0x%p != 0x%p (%u).\n",
2516                         shost->host_no, hba,
2517                         csk->cdev->hbas[csk->port_id], csk->port_id);
2518                 err = -ENOSPC;
2519                 goto release_conn;
2520         }
2521
2522         err = sock_get_port(csk);
2523         if (err)
2524                 goto release_conn;
2525
2526         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2527         err = csk->cdev->csk_init_act_open(csk);
2528         if (err)
2529                 goto release_conn;
2530
2531         if (cxgbi_sock_is_closing(csk)) {
2532                 err = -ENOSPC;
2533                 pr_info("csk 0x%p is closing.\n", csk);
2534                 goto release_conn;
2535         }
2536
2537         ep = iscsi_create_endpoint(sizeof(*cep));
2538         if (!ep) {
2539                 err = -ENOMEM;
2540                 pr_info("iscsi alloc ep, OOM.\n");
2541                 goto release_conn;
2542         }
2543
2544         cep = ep->dd_data;
2545         cep->csk = csk;
2546         cep->chba = hba;
2547
2548         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2549                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2550                 ep, cep, csk, hba, hba->ndev->name);
2551         return ep;
2552
2553 release_conn:
2554         cxgbi_sock_put(csk);
2555         cxgbi_sock_closed(csk);
2556 err_out:
2557         return ERR_PTR(err);
2558 }
2559 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2560
2561 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2562 {
2563         struct cxgbi_endpoint *cep = ep->dd_data;
2564         struct cxgbi_sock *csk = cep->csk;
2565
2566         if (!cxgbi_sock_is_established(csk))
2567                 return 0;
2568         return 1;
2569 }
2570 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2571
2572 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2573 {
2574         struct cxgbi_endpoint *cep = ep->dd_data;
2575         struct cxgbi_conn *cconn = cep->cconn;
2576         struct cxgbi_sock *csk = cep->csk;
2577
2578         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2579                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2580                 ep, cep, cconn, csk, csk->state, csk->flags);
2581
2582         if (cconn && cconn->iconn) {
2583                 iscsi_suspend_tx(cconn->iconn);
2584                 write_lock_bh(&csk->callback_lock);
2585                 cep->csk->user_data = NULL;
2586                 cconn->cep = NULL;
2587                 write_unlock_bh(&csk->callback_lock);
2588         }
2589         iscsi_destroy_endpoint(ep);
2590
2591         if (likely(csk->state >= CTP_ESTABLISHED))
2592                 need_active_close(csk);
2593         else
2594                 cxgbi_sock_closed(csk);
2595
2596         cxgbi_sock_put(csk);
2597 }
2598 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2599
2600 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2601                         struct scsi_transport_template **stt)
2602 {
2603         *stt = iscsi_register_transport(itp);
2604         if (*stt == NULL) {
2605                 pr_err("unable to register %s transport 0x%p.\n",
2606                         itp->name, itp);
2607                 return -ENODEV;
2608         }
2609         log_debug(1 << CXGBI_DBG_ISCSI,
2610                 "%s, registered iscsi transport 0x%p.\n",
2611                 itp->name, stt);
2612         return 0;
2613 }
2614 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2615
2616 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2617                         struct scsi_transport_template **stt)
2618 {
2619         if (*stt) {
2620                 log_debug(1 << CXGBI_DBG_ISCSI,
2621                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2622                         itp, itp->name, *stt);
2623                 *stt = NULL;
2624                 iscsi_unregister_transport(itp);
2625         }
2626 }
2627 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2628
2629 umode_t cxgbi_attr_is_visible(int param_type, int param)
2630 {
2631         switch (param_type) {
2632         case ISCSI_HOST_PARAM:
2633                 switch (param) {
2634                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2635                 case ISCSI_HOST_PARAM_HWADDRESS:
2636                 case ISCSI_HOST_PARAM_IPADDRESS:
2637                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2638                         return S_IRUGO;
2639                 default:
2640                         return 0;
2641                 }
2642         case ISCSI_PARAM:
2643                 switch (param) {
2644                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2645                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2646                 case ISCSI_PARAM_HDRDGST_EN:
2647                 case ISCSI_PARAM_DATADGST_EN:
2648                 case ISCSI_PARAM_CONN_ADDRESS:
2649                 case ISCSI_PARAM_CONN_PORT:
2650                 case ISCSI_PARAM_EXP_STATSN:
2651                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2652                 case ISCSI_PARAM_PERSISTENT_PORT:
2653                 case ISCSI_PARAM_PING_TMO:
2654                 case ISCSI_PARAM_RECV_TMO:
2655                 case ISCSI_PARAM_INITIAL_R2T_EN:
2656                 case ISCSI_PARAM_MAX_R2T:
2657                 case ISCSI_PARAM_IMM_DATA_EN:
2658                 case ISCSI_PARAM_FIRST_BURST:
2659                 case ISCSI_PARAM_MAX_BURST:
2660                 case ISCSI_PARAM_PDU_INORDER_EN:
2661                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2662                 case ISCSI_PARAM_ERL:
2663                 case ISCSI_PARAM_TARGET_NAME:
2664                 case ISCSI_PARAM_TPGT:
2665                 case ISCSI_PARAM_USERNAME:
2666                 case ISCSI_PARAM_PASSWORD:
2667                 case ISCSI_PARAM_USERNAME_IN:
2668                 case ISCSI_PARAM_PASSWORD_IN:
2669                 case ISCSI_PARAM_FAST_ABORT:
2670                 case ISCSI_PARAM_ABORT_TMO:
2671                 case ISCSI_PARAM_LU_RESET_TMO:
2672                 case ISCSI_PARAM_TGT_RESET_TMO:
2673                 case ISCSI_PARAM_IFACE_NAME:
2674                 case ISCSI_PARAM_INITIATOR_NAME:
2675                         return S_IRUGO;
2676                 default:
2677                         return 0;
2678                 }
2679         }
2680
2681         return 0;
2682 }
2683 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2684
2685 static int __init libcxgbi_init_module(void)
2686 {
2687         pr_info("%s", version);
2688         return 0;
2689 }
2690
2691 static void __exit libcxgbi_exit_module(void)
2692 {
2693         cxgbi_device_unregister_all(0xFF);
2694         return;
2695 }
2696
2697 module_init(libcxgbi_init_module);
2698 module_exit(libcxgbi_exit_module);