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 (is_vlan_dev(ndev)) {
 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 (is_vlan_dev(ndev)) {
 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 (is_vlan_dev(ndev)) {
 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         timer_setup(&csk->retry_timer, NULL, 0);
 577         init_completion(&csk->cmpl);
 578         rwlock_init(&csk->callback_lock);
 579         csk->cdev = cdev;
 580         csk->flags = 0;
 581         cxgbi_sock_set_state(csk, CTP_CLOSED);
 582
 583         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 584
 585         return csk;
 586 }
 587
 588 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 589                                       __be32 saddr, __be32 daddr,
 590                                       __be16 sport, __be16 dport, u8 tos,
 591                                       int ifindex)
 592 {
 593         struct rtable *rt;
 594
 595         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 596                                    dport, sport, IPPROTO_TCP, tos, ifindex);
 597         if (IS_ERR(rt))
 598                 return NULL;
 599
 600         return rt;
 601 }
 602
 603 static struct cxgbi_sock *
 604 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
 605 {
 606         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 607         struct dst_entry *dst;
 608         struct net_device *ndev;
 609         struct cxgbi_device *cdev;
 610         struct rtable *rt = NULL;
 611         struct neighbour *n;
 612         struct flowi4 fl4;
 613         struct cxgbi_sock *csk = NULL;
 614         unsigned int mtu = 0;
 615         int port = 0xFFFF;
 616         int err = 0;
 617
 618         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
 619                              daddr->sin_port, 0, ifindex);
 620         if (!rt) {
 621                 pr_info("no route to ipv4 0x%x, port %u.\n",
 622                         be32_to_cpu(daddr->sin_addr.s_addr),
 623                         be16_to_cpu(daddr->sin_port));
 624                 err = -ENETUNREACH;
 625                 goto err_out;
 626         }
 627         dst = &rt->dst;
 628         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 629         if (!n) {
 630                 err = -ENODEV;
 631                 goto rel_rt;
 632         }
 633         ndev = n->dev;
 634
 635         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 636                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 637                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 638                         ndev->name);
 639                 err = -ENETUNREACH;
 640                 goto rel_neigh;
 641         }
 642
 643         if (ndev->flags & IFF_LOOPBACK) {
 644                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 645                 if (!ndev) {
 646                         err = -ENETUNREACH;
 647                         goto rel_neigh;
 648                 }
 649                 mtu = ndev->mtu;
 650                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 651                         n->dev->name, ndev->name, mtu);
 652         }
 653
 654         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 655                 pr_info("%s interface not up.\n", ndev->name);
 656                 err = -ENETDOWN;
 657                 goto rel_neigh;
 658         }
 659
 660         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 661         if (!cdev) {
 662                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 663                         &daddr->sin_addr.s_addr, ndev->name);
 664                 err = -ENETUNREACH;
 665                 goto rel_neigh;
 666         }
 667         log_debug(1 << CXGBI_DBG_SOCK,
 668                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 669                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 670                            port, ndev->name, cdev);
 671
 672         csk = cxgbi_sock_create(cdev);
 673         if (!csk) {
 674                 err = -ENOMEM;
 675                 goto rel_neigh;
 676         }
 677         csk->cdev = cdev;
 678         csk->port_id = port;
 679         csk->mtu = mtu;
 680         csk->dst = dst;
 681
 682         csk->csk_family = AF_INET;
 683         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 684         csk->daddr.sin_port = daddr->sin_port;
 685         csk->daddr.sin_family = daddr->sin_family;
 686         csk->saddr.sin_family = daddr->sin_family;
 687         csk->saddr.sin_addr.s_addr = fl4.saddr;
 688         neigh_release(n);
 689
 690         return csk;
 691
 692 rel_neigh:
 693         neigh_release(n);
 694
 695 rel_rt:
 696         ip_rt_put(rt);
 697 err_out:
 698         return ERR_PTR(err);
 699 }
 700
 701 #if IS_ENABLED(CONFIG_IPV6)
 702 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 703                                         const struct in6_addr *daddr,
 704                                         int ifindex)
 705 {
 706         struct flowi6 fl;
 707
 708         memset(&fl, 0, sizeof(fl));
 709         fl.flowi6_oif = ifindex;
 710         if (saddr)
 711                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 712         if (daddr)
 713                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 714         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 715 }
 716
 717 static struct cxgbi_sock *
 718 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
 719 {
 720         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 721         struct dst_entry *dst;
 722         struct net_device *ndev;
 723         struct cxgbi_device *cdev;
 724         struct rt6_info *rt = NULL;
 725         struct neighbour *n;
 726         struct in6_addr pref_saddr;
 727         struct cxgbi_sock *csk = NULL;
 728         unsigned int mtu = 0;
 729         int port = 0xFFFF;
 730         int err = 0;
 731
 732         rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
 733
 734         if (!rt) {
 735                 pr_info("no route to ipv6 %pI6 port %u\n",
 736                         daddr6->sin6_addr.s6_addr,
 737                         be16_to_cpu(daddr6->sin6_port));
 738                 err = -ENETUNREACH;
 739                 goto err_out;
 740         }
 741
 742         dst = &rt->dst;
 743
 744         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 745
 746         if (!n) {
 747                 pr_info("%pI6, port %u, dst no neighbour.\n",
 748                         daddr6->sin6_addr.s6_addr,
 749                         be16_to_cpu(daddr6->sin6_port));
 750                 err = -ENETUNREACH;
 751                 goto rel_rt;
 752         }
 753         ndev = n->dev;
 754
 755         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 756                 pr_info("%s interface not up.\n", ndev->name);
 757                 err = -ENETDOWN;
 758                 goto rel_rt;
 759         }
 760
 761         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 762                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 763                         daddr6->sin6_addr.s6_addr,
 764                         ntohs(daddr6->sin6_port), ndev->name);
 765                 err = -ENETUNREACH;
 766                 goto rel_rt;
 767         }
 768
 769         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 770         if (!cdev)
 771                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 772         if (!cdev) {
 773                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 774                         daddr6->sin6_addr.s6_addr, ndev->name);
 775                 err = -ENETUNREACH;
 776                 goto rel_rt;
 777         }
 778         log_debug(1 << CXGBI_DBG_SOCK,
 779                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 780                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 781                   ndev->name, cdev);
 782
 783         csk = cxgbi_sock_create(cdev);
 784         if (!csk) {
 785                 err = -ENOMEM;
 786                 goto rel_rt;
 787         }
 788         csk->cdev = cdev;
 789         csk->port_id = port;
 790         csk->mtu = mtu;
 791         csk->dst = dst;
 792
 793         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 794                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 795
 796                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 797                                          &daddr6->sin6_addr, 0, &pref_saddr);
 798                 if (err) {
 799                         pr_info("failed to get source address to reach %pI6\n",
 800                                 &daddr6->sin6_addr);
 801                         goto rel_rt;
 802                 }
 803         } else {
 804                 pref_saddr = rt->rt6i_prefsrc.addr;
 805         }
 806
 807         csk->csk_family = AF_INET6;
 808         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 809         csk->daddr6.sin6_port = daddr6->sin6_port;
 810         csk->daddr6.sin6_family = daddr6->sin6_family;
 811         csk->saddr6.sin6_family = daddr6->sin6_family;
 812         csk->saddr6.sin6_addr = pref_saddr;
 813
 814         neigh_release(n);
 815         return csk;
 816
 817 rel_rt:
 818         if (n)
 819                 neigh_release(n);
 820
 821         ip6_rt_put(rt);
 822         if (csk)
 823                 cxgbi_sock_closed(csk);
 824 err_out:
 825         return ERR_PTR(err);
 826 }
 827 #endif /* IS_ENABLED(CONFIG_IPV6) */
 828
 829 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 830                         unsigned int opt)
 831 {
 832         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 833         dst_confirm(csk->dst);
 834         smp_mb();
 835         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 836 }
 837 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 838
 839 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 840 {
 841         log_debug(1 << CXGBI_DBG_SOCK,
 842                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 843                 csk, csk->state, csk->flags, csk->user_data);
 844
 845         if (csk->state != CTP_ESTABLISHED) {
 846                 read_lock_bh(&csk->callback_lock);
 847                 if (csk->user_data)
 848                         iscsi_conn_failure(csk->user_data,
 849                                         ISCSI_ERR_TCP_CONN_CLOSE);
 850                 read_unlock_bh(&csk->callback_lock);
 851         }
 852 }
 853
 854 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 855 {
 856         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 857                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 858         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 859         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 860                 return;
 861         if (csk->saddr.sin_port)
 862                 sock_put_port(csk);
 863         if (csk->dst)
 864                 dst_release(csk->dst);
 865         csk->cdev->csk_release_offload_resources(csk);
 866         cxgbi_sock_set_state(csk, CTP_CLOSED);
 867         cxgbi_inform_iscsi_conn_closing(csk);
 868         cxgbi_sock_put(csk);
 869 }
 870 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 871
 872 static void need_active_close(struct cxgbi_sock *csk)
 873 {
 874         int data_lost;
 875         int close_req = 0;
 876
 877         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 878                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 879         spin_lock_bh(&csk->lock);
 880         if (csk->dst)
 881                 dst_confirm(csk->dst);
 882         data_lost = skb_queue_len(&csk->receive_queue);
 883         __skb_queue_purge(&csk->receive_queue);
 884
 885         if (csk->state == CTP_ACTIVE_OPEN)
 886                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 887         else if (csk->state == CTP_ESTABLISHED) {
 888                 close_req = 1;
 889                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 890         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 891                 close_req = 1;
 892                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 893         }
 894
 895         if (close_req) {
 896                 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
 897                     data_lost)
 898                         csk->cdev->csk_send_abort_req(csk);
 899                 else
 900                         csk->cdev->csk_send_close_req(csk);
 901         }
 902
 903         spin_unlock_bh(&csk->lock);
 904 }
 905
 906 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 907 {
 908         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 909                         csk, csk->state, csk->flags,
 910                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 911                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 912                         errno);
 913
 914         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 915         csk->err = errno;
 916         cxgbi_sock_closed(csk);
 917 }
 918 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 919
 920 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 921 {
 922         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 923         struct module *owner = csk->cdev->owner;
 924
 925         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 926                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 927         cxgbi_sock_get(csk);
 928         spin_lock_bh(&csk->lock);
 929         if (csk->state == CTP_ACTIVE_OPEN)
 930                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 931         spin_unlock_bh(&csk->lock);
 932         cxgbi_sock_put(csk);
 933         __kfree_skb(skb);
 934
 935         module_put(owner);
 936 }
 937 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 938
 939 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 940 {
 941         cxgbi_sock_get(csk);
 942         spin_lock_bh(&csk->lock);
 943
 944         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 945         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 946                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 947                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 948                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 949                                csk, csk->state, csk->flags, csk->tid);
 950                 cxgbi_sock_closed(csk);
 951         }
 952
 953         spin_unlock_bh(&csk->lock);
 954         cxgbi_sock_put(csk);
 955 }
 956 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 957
 958 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 959 {
 960         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 961                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 962         cxgbi_sock_get(csk);
 963         spin_lock_bh(&csk->lock);
 964
 965         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 966                 goto done;
 967
 968         switch (csk->state) {
 969         case CTP_ESTABLISHED:
 970                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 971                 break;
 972         case CTP_ACTIVE_CLOSE:
 973                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 974                 break;
 975         case CTP_CLOSE_WAIT_1:
 976                 cxgbi_sock_closed(csk);
 977                 break;
 978         case CTP_ABORTING:
 979                 break;
 980         default:
 981                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 982                         csk, csk->state, csk->flags, csk->tid);
 983         }
 984         cxgbi_inform_iscsi_conn_closing(csk);
 985 done:
 986         spin_unlock_bh(&csk->lock);
 987         cxgbi_sock_put(csk);
 988 }
 989 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 990
 991 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 992 {
 993         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 994                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 995         cxgbi_sock_get(csk);
 996         spin_lock_bh(&csk->lock);
 997
 998         csk->snd_una = snd_nxt - 1;
 999         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
1000                 goto done;
1001
1002         switch (csk->state) {
1003         case CTP_ACTIVE_CLOSE:
1004                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1005                 break;
1006         case CTP_CLOSE_WAIT_1:
1007         case CTP_CLOSE_WAIT_2:
1008                 cxgbi_sock_closed(csk);
1009                 break;
1010         case CTP_ABORTING:
1011                 break;
1012         default:
1013                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1014                         csk, csk->state, csk->flags, csk->tid);
1015         }
1016 done:
1017         spin_unlock_bh(&csk->lock);
1018         cxgbi_sock_put(csk);
1019 }
1020 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1021
1022 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1023                            unsigned int snd_una, int seq_chk)
1024 {
1025         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1026                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1027                         csk, csk->state, csk->flags, csk->tid, credits,
1028                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1029
1030         spin_lock_bh(&csk->lock);
1031
1032         csk->wr_cred += credits;
1033         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1034                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1035
1036         while (credits) {
1037                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1038
1039                 if (unlikely(!p)) {
1040                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1041                                 csk, csk->state, csk->flags, csk->tid, credits,
1042                                 csk->wr_cred, csk->wr_una_cred);
1043                         break;
1044                 }
1045
1046                 if (unlikely(credits < p->csum)) {
1047                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1048                                 csk, csk->state, csk->flags, csk->tid,
1049                                 credits, csk->wr_cred, csk->wr_una_cred,
1050                                 p->csum);
1051                         p->csum -= credits;
1052                         break;
1053                 } else {
1054                         cxgbi_sock_dequeue_wr(csk);
1055                         credits -= p->csum;
1056                         kfree_skb(p);
1057                 }
1058         }
1059
1060         cxgbi_sock_check_wr_invariants(csk);
1061
1062         if (seq_chk) {
1063                 if (unlikely(before(snd_una, csk->snd_una))) {
1064                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1065                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1066                                 csk->snd_una);
1067                         goto done;
1068                 }
1069
1070                 if (csk->snd_una != snd_una) {
1071                         csk->snd_una = snd_una;
1072                         dst_confirm(csk->dst);
1073                 }
1074         }
1075
1076         if (skb_queue_len(&csk->write_queue)) {
1077                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1078                         cxgbi_conn_tx_open(csk);
1079         } else
1080                 cxgbi_conn_tx_open(csk);
1081 done:
1082         spin_unlock_bh(&csk->lock);
1083 }
1084 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1085
1086 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1087                                              unsigned short mtu)
1088 {
1089         int i = 0;
1090
1091         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1092                 ++i;
1093
1094         return i;
1095 }
1096
1097 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1098 {
1099         unsigned int idx;
1100         struct dst_entry *dst = csk->dst;
1101
1102         csk->advmss = dst_metric_advmss(dst);
1103
1104         if (csk->advmss > pmtu - 40)
1105                 csk->advmss = pmtu - 40;
1106         if (csk->advmss < csk->cdev->mtus[0] - 40)
1107                 csk->advmss = csk->cdev->mtus[0] - 40;
1108         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1109
1110         return idx;
1111 }
1112 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1113
1114 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1115 {
1116         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1117         __skb_queue_tail(&csk->write_queue, skb);
1118 }
1119 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1120
1121 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1122 {
1123         struct sk_buff *skb;
1124
1125         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1126                 kfree_skb(skb);
1127 }
1128 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1129
1130 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1131 {
1132         int pending = cxgbi_sock_count_pending_wrs(csk);
1133
1134         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1135                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1136                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1137 }
1138 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1139
1140 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1141 {
1142         struct cxgbi_device *cdev = csk->cdev;
1143         struct sk_buff *next;
1144         int err, copied = 0;
1145
1146         spin_lock_bh(&csk->lock);
1147
1148         if (csk->state != CTP_ESTABLISHED) {
1149                 log_debug(1 << CXGBI_DBG_PDU_TX,
1150                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1151                         csk, csk->state, csk->flags, csk->tid);
1152                 err = -EAGAIN;
1153                 goto out_err;
1154         }
1155
1156         if (csk->err) {
1157                 log_debug(1 << CXGBI_DBG_PDU_TX,
1158                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1159                         csk, csk->state, csk->flags, csk->tid, csk->err);
1160                 err = -EPIPE;
1161                 goto out_err;
1162         }
1163
1164         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1165                 log_debug(1 << CXGBI_DBG_PDU_TX,
1166                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1167                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1168                         csk->snd_una, csk->snd_win);
1169                 err = -ENOBUFS;
1170                 goto out_err;
1171         }
1172
1173         while (skb) {
1174                 int frags = skb_shinfo(skb)->nr_frags +
1175                                 (skb->len != skb->data_len);
1176
1177                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1178                         pr_err("csk 0x%p, skb head %u < %u.\n",
1179                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1180                         err = -EINVAL;
1181                         goto out_err;
1182                 }
1183
1184                 if (frags >= SKB_WR_LIST_SIZE) {
1185                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1186                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1187                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1188                         err = -EINVAL;
1189                         goto out_err;
1190                 }
1191
1192                 next = skb->next;
1193                 skb->next = NULL;
1194                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1195                 cxgbi_sock_skb_entail(csk, skb);
1196                 copied += skb->len;
1197                 csk->write_seq += skb->len +
1198                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1199                 skb = next;
1200         }
1201
1202         if (likely(skb_queue_len(&csk->write_queue)))
1203                 cdev->csk_push_tx_frames(csk, 1);
1204 done:
1205         spin_unlock_bh(&csk->lock);
1206         return copied;
1207
1208 out_err:
1209         if (copied == 0 && err == -EPIPE)
1210                 copied = csk->err ? csk->err : -EPIPE;
1211         else
1212                 copied = err;
1213         goto done;
1214 }
1215
1216 static inline void
1217 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1218                 unsigned int *sgcnt, unsigned int *dlen,
1219                 unsigned int prot)
1220 {
1221         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1222
1223         *sgl = sdb->table.sgl;
1224         *sgcnt = sdb->table.nents;
1225         *dlen = sdb->length;
1226         /* Caution: for protection sdb, sdb->length is invalid */
1227 }
1228
1229 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1230                             struct cxgbi_task_tag_info *ttinfo,
1231                             struct scatterlist **sg_pp, unsigned int *sg_off)
1232 {
1233         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1234         unsigned int offset = sg_off ? *sg_off : 0;
1235         dma_addr_t addr = 0UL;
1236         unsigned int len = 0;
1237         int i;
1238
1239         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1240
1241         if (sg) {
1242                 addr = sg_dma_address(sg);
1243                 len = sg_dma_len(sg);
1244         }
1245
1246         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1247                 if (sg) {
1248                         ppod->addr[i] = cpu_to_be64(addr + offset);
1249                         offset += PAGE_SIZE;
1250                         if (offset == (len + sg->offset)) {
1251                                 offset = 0;
1252                                 sg = sg_next(sg);
1253                                 if (sg) {
1254                                         addr = sg_dma_address(sg);
1255                                         len = sg_dma_len(sg);
1256                                 }
1257                         }
1258                 } else {
1259                         ppod->addr[i] = 0ULL;
1260                 }
1261         }
1262
1263         /*
1264          * the fifth address needs to be repeated in the next ppod, so do
1265          * not move sg
1266          */
1267         if (sg_pp) {
1268                 *sg_pp = sg;
1269                 *sg_off = offset;
1270         }
1271
1272         if (offset == len) {
1273                 offset = 0;
1274                 sg = sg_next(sg);
1275                 if (sg) {
1276                         addr = sg_dma_address(sg);
1277                         len = sg_dma_len(sg);
1278                 }
1279         }
1280         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1281 }
1282 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1283
1284 /*
1285  * APIs interacting with open-iscsi libraries
1286  */
1287
1288 static unsigned char padding[4];
1289
1290 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1291                          struct cxgbi_tag_format *tformat, unsigned int ppmax,
1292                          unsigned int llimit, unsigned int start,
1293                          unsigned int rsvd_factor)
1294 {
1295         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1296                                 cdev->lldev, tformat, ppmax, llimit, start,
1297                                 rsvd_factor);
1298
1299         if (err >= 0) {
1300                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1301
1302                 if (ppm->ppmax < 1024 ||
1303                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1304                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1305                 err = 0;
1306         } else {
1307                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1308         }
1309 }
1310 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1311
1312 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1313 {
1314         int i;
1315         int last_sgidx = nents - 1;
1316         struct scatterlist *sg = sgl;
1317
1318         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1319                 unsigned int len = sg->length + sg->offset;
1320
1321                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1322                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1323                         log_debug(1 << CXGBI_DBG_DDP,
1324                                   "sg %u/%u, %u,%u, not aligned.\n",
1325                                   i, nents, sg->offset, sg->length);
1326                         goto err_out;
1327                 }
1328         }
1329         return 0;
1330 err_out:
1331         return -EINVAL;
1332 }
1333
1334 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1335                              struct cxgbi_task_data *tdata, u32 sw_tag,
1336                              unsigned int xferlen)
1337 {
1338         struct cxgbi_sock *csk = cconn->cep->csk;
1339         struct cxgbi_device *cdev = csk->cdev;
1340         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1341         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1342         struct scatterlist *sgl = ttinfo->sgl;
1343         unsigned int sgcnt = ttinfo->nents;
1344         unsigned int sg_offset = sgl->offset;
1345         int err;
1346
1347         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1348                 log_debug(1 << CXGBI_DBG_DDP,
1349                           "cdev 0x%p DDP off.\n", cdev);
1350                 return -EINVAL;
1351         }
1352
1353         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1354             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1355                 log_debug(1 << CXGBI_DBG_DDP,
1356                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1357                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1358                           xferlen, ttinfo->nents);
1359                 return -EINVAL;
1360         }
1361
1362         /* make sure the buffer is suitable for ddp */
1363         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1364                 return -EINVAL;
1365
1366         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1367                             PAGE_SHIFT;
1368
1369         /*
1370          * the ddp tag will be used for the itt in the outgoing pdu,
1371          * the itt genrated by libiscsi is saved in the ppm and can be
1372          * retrieved via the ddp tag
1373          */
1374         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1375                                       &ttinfo->tag, (unsigned long)sw_tag);
1376         if (err < 0) {
1377                 cconn->ddp_full++;
1378                 return err;
1379         }
1380         ttinfo->npods = err;
1381
1382          /* setup dma from scsi command sgl */
1383         sgl->offset = 0;
1384         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1385         sgl->offset = sg_offset;
1386         if (err == 0) {
1387                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1388                         __func__, sw_tag, xferlen, sgcnt);
1389                 goto rel_ppods;
1390         }
1391         if (err != ttinfo->nr_pages) {
1392                 log_debug(1 << CXGBI_DBG_DDP,
1393                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1394                           __func__, sw_tag, xferlen, sgcnt, err);
1395         }
1396
1397         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1398         ttinfo->cid = csk->port_id;
1399
1400         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1401                                 xferlen, &ttinfo->hdr);
1402
1403         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1404                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1405                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1406         } else {
1407                 /* write ppod from control queue now */
1408                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1409                 if (err < 0)
1410                         goto rel_ppods;
1411         }
1412
1413         return 0;
1414
1415 rel_ppods:
1416         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1417
1418         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1419                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1420                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1421         }
1422         return -EINVAL;
1423 }
1424
1425 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1426 {
1427         struct scsi_cmnd *sc = task->sc;
1428         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1429         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1430         struct cxgbi_device *cdev = cconn->chba->cdev;
1431         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1432         u32 tag = ntohl((__force u32)hdr_itt);
1433
1434         log_debug(1 << CXGBI_DBG_DDP,
1435                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1436                   cdev, task, tag);
1437         if (sc &&
1438             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1439             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1440                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1441                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1442
1443                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1444                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1445                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1446                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1447                              DMA_FROM_DEVICE);
1448         }
1449 }
1450
1451 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1452 {
1453         /* assume idx and age both are < 0x7FFF (32767) */
1454         return (idx << 16) | age;
1455 }
1456
1457 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1458 {
1459         struct scsi_cmnd *sc = task->sc;
1460         struct iscsi_conn *conn = task->conn;
1461         struct iscsi_session *sess = conn->session;
1462         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1463         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1464         struct cxgbi_device *cdev = cconn->chba->cdev;
1465         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1466         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1467         u32 tag = 0;
1468         int err = -EINVAL;
1469
1470         if (sc &&
1471             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1472         ) {
1473                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1474                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1475
1476                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1477                                 &tdata->dlen, 0);
1478                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1479                 if (!err)
1480                         tag = ttinfo->tag;
1481                 else
1482                          log_debug(1 << CXGBI_DBG_DDP,
1483                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1484                                    cconn->cep->csk, task, tdata->dlen,
1485                                    ttinfo->nents);
1486         }
1487
1488         if (err < 0) {
1489                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1490                 if (err < 0)
1491                         return err;
1492         }
1493         /*  the itt need to sent in big-endian order */
1494         *hdr_itt = (__force itt_t)htonl(tag);
1495
1496         log_debug(1 << CXGBI_DBG_DDP,
1497                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1498                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1499         return 0;
1500 }
1501
1502 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1503 {
1504         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1505         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1506         struct cxgbi_device *cdev = cconn->chba->cdev;
1507         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1508         u32 tag = ntohl((__force u32)itt);
1509         u32 sw_bits;
1510
1511         if (ppm) {
1512                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1513                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1514                 else
1515                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1516         } else {
1517                 sw_bits = tag;
1518         }
1519
1520         cxgbi_decode_sw_tag(sw_bits, idx, age);
1521         log_debug(1 << CXGBI_DBG_DDP,
1522                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1523                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1524                   age ? *age : 0xFF);
1525 }
1526 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1527
1528 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1529 {
1530         struct iscsi_conn *conn = csk->user_data;
1531
1532         if (conn) {
1533                 log_debug(1 << CXGBI_DBG_SOCK,
1534                         "csk 0x%p, cid %d.\n", csk, conn->id);
1535                 iscsi_conn_queue_work(conn);
1536         }
1537 }
1538 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1539
1540 /*
1541  * pdu receive, interact with libiscsi_tcp
1542  */
1543 static inline int read_pdu_skb(struct iscsi_conn *conn,
1544                                struct sk_buff *skb,
1545                                unsigned int offset,
1546                                int offloaded)
1547 {
1548         int status = 0;
1549         int bytes_read;
1550
1551         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1552         switch (status) {
1553         case ISCSI_TCP_CONN_ERR:
1554                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1555                           skb, offset, offloaded);
1556                 return -EIO;
1557         case ISCSI_TCP_SUSPENDED:
1558                 log_debug(1 << CXGBI_DBG_PDU_RX,
1559                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1560                         skb, offset, offloaded, bytes_read);
1561                 /* no transfer - just have caller flush queue */
1562                 return bytes_read;
1563         case ISCSI_TCP_SKB_DONE:
1564                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1565                         skb, offset, offloaded);
1566                 /*
1567                  * pdus should always fit in the skb and we should get
1568                  * segment done notifcation.
1569                  */
1570                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1571                 return -EFAULT;
1572         case ISCSI_TCP_SEGMENT_DONE:
1573                 log_debug(1 << CXGBI_DBG_PDU_RX,
1574                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1575                         skb, offset, offloaded, bytes_read);
1576                 return bytes_read;
1577         default:
1578                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1579                         skb, offset, offloaded, status);
1580                 return -EINVAL;
1581         }
1582 }
1583
1584 static int
1585 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1586                  struct sk_buff *skb)
1587 {
1588         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1589         int err;
1590
1591         log_debug(1 << CXGBI_DBG_PDU_RX,
1592                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1593                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1594
1595         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1596                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1597                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1598                 return -EIO;
1599         }
1600
1601         if (conn->hdrdgst_en &&
1602             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1603                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1604                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1605                 return -EIO;
1606         }
1607
1608         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1609             cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1610                 /* If completion flag is set and data is directly
1611                  * placed in to the host memory then update
1612                  * task->exp_datasn to the datasn in completion
1613                  * iSCSI hdr as T6 adapter generates completion only
1614                  * for the last pdu of a sequence.
1615                  */
1616                 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1617                 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1618                 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1619                                                         skb->data)->datasn);
1620                 if (task && task->sc) {
1621                         struct iscsi_tcp_task *tcp_task = task->dd_data;
1622
1623                         tcp_task->exp_datasn = data_sn;
1624                 }
1625         }
1626
1627         err = read_pdu_skb(conn, skb, 0, 0);
1628         if (likely(err >= 0)) {
1629                 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1630                 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1631
1632                 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1633                         cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1634         }
1635
1636         return err;
1637 }
1638
1639 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1640                              struct sk_buff *skb, unsigned int offset)
1641 {
1642         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1643         bool offloaded = 0;
1644         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1645
1646         log_debug(1 << CXGBI_DBG_PDU_RX,
1647                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1648                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1649
1650         if (conn->datadgst_en &&
1651             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1652                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1653                         conn, lskb, cxgbi_skcb_flags(lskb));
1654                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1655                 return -EIO;
1656         }
1657
1658         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1659                 return 0;
1660
1661         /* coalesced, add header digest length */
1662         if (lskb == skb && conn->hdrdgst_en)
1663                 offset += ISCSI_DIGEST_SIZE;
1664
1665         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1666                 offloaded = 1;
1667
1668         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1669                 log_debug(1 << CXGBI_DBG_PDU_RX,
1670                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1671                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1672                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1673
1674         return read_pdu_skb(conn, skb, offset, offloaded);
1675 }
1676
1677 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1678 {
1679         struct cxgbi_device *cdev = csk->cdev;
1680         int must_send;
1681         u32 credits;
1682
1683         log_debug(1 << CXGBI_DBG_PDU_RX,
1684                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1685                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1686                 csk->rcv_wup, cdev->rx_credit_thres,
1687                 csk->rcv_win);
1688
1689         if (!cdev->rx_credit_thres)
1690                 return;
1691
1692         if (csk->state != CTP_ESTABLISHED)
1693                 return;
1694
1695         credits = csk->copied_seq - csk->rcv_wup;
1696         if (unlikely(!credits))
1697                 return;
1698         must_send = credits + 16384 >= csk->rcv_win;
1699         if (must_send || credits >= cdev->rx_credit_thres)
1700                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1701 }
1702
1703 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1704 {
1705         struct cxgbi_device *cdev = csk->cdev;
1706         struct iscsi_conn *conn = csk->user_data;
1707         struct sk_buff *skb;
1708         unsigned int read = 0;
1709         int err = 0;
1710
1711         log_debug(1 << CXGBI_DBG_PDU_RX,
1712                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1713
1714         if (unlikely(!conn || conn->suspend_rx)) {
1715                 log_debug(1 << CXGBI_DBG_PDU_RX,
1716                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1717                         csk, conn, conn ? conn->id : 0xFF,
1718                         conn ? conn->suspend_rx : 0xFF);
1719                 return;
1720         }
1721
1722         while (!err) {
1723                 skb = skb_peek(&csk->receive_queue);
1724                 if (!skb ||
1725                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1726                         if (skb)
1727                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1728                                         "skb 0x%p, NOT ready 0x%lx.\n",
1729                                         skb, cxgbi_skcb_flags(skb));
1730                         break;
1731                 }
1732                 __skb_unlink(skb, &csk->receive_queue);
1733
1734                 read += cxgbi_skcb_rx_pdulen(skb);
1735                 log_debug(1 << CXGBI_DBG_PDU_RX,
1736                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1737                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1738                         cxgbi_skcb_rx_pdulen(skb));
1739
1740                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1741                         err = skb_read_pdu_bhs(csk, conn, skb);
1742                         if (err < 0) {
1743                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1744                                         "f 0x%lx, plen %u.\n",
1745                                         csk, skb, skb->len,
1746                                         cxgbi_skcb_flags(skb),
1747                                         cxgbi_skcb_rx_pdulen(skb));
1748                                 goto skb_done;
1749                         }
1750                         err = skb_read_pdu_data(conn, skb, skb,
1751                                                 err + cdev->skb_rx_extra);
1752                         if (err < 0)
1753                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1754                                         "f 0x%lx, plen %u.\n",
1755                                         csk, skb, skb->len,
1756                                         cxgbi_skcb_flags(skb),
1757                                         cxgbi_skcb_rx_pdulen(skb));
1758                 } else {
1759                         err = skb_read_pdu_bhs(csk, conn, skb);
1760                         if (err < 0) {
1761                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1762                                         "f 0x%lx, plen %u.\n",
1763                                         csk, skb, skb->len,
1764                                         cxgbi_skcb_flags(skb),
1765                                         cxgbi_skcb_rx_pdulen(skb));
1766                                 goto skb_done;
1767                         }
1768
1769                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1770                                 struct sk_buff *dskb;
1771
1772                                 dskb = skb_peek(&csk->receive_queue);
1773                                 if (!dskb) {
1774                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1775                                                 " plen %u, NO data.\n",
1776                                                 csk, skb, skb->len,
1777                                                 cxgbi_skcb_flags(skb),
1778                                                 cxgbi_skcb_rx_pdulen(skb));
1779                                         err = -EIO;
1780                                         goto skb_done;
1781                                 }
1782                                 __skb_unlink(dskb, &csk->receive_queue);
1783
1784                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1785                                 if (err < 0)
1786                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1787                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1788                                                 "%u.\n",
1789                                                 csk, skb, skb->len,
1790                                                 cxgbi_skcb_flags(skb),
1791                                                 cxgbi_skcb_rx_pdulen(skb),
1792                                                 dskb, dskb->len);
1793                                 __kfree_skb(dskb);
1794                         } else
1795                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1796                 }
1797 skb_done:
1798                 __kfree_skb(skb);
1799
1800                 if (err < 0)
1801                         break;
1802         }
1803
1804         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1805         if (read) {
1806                 csk->copied_seq += read;
1807                 csk_return_rx_credits(csk, read);
1808                 conn->rxdata_octets += read;
1809         }
1810
1811         if (err < 0) {
1812                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1813                         csk, conn, err, read);
1814                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1815         }
1816 }
1817 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1818
1819 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1820                                 unsigned int offset, unsigned int *off,
1821                                 struct scatterlist **sgp)
1822 {
1823         int i;
1824         struct scatterlist *sg;
1825
1826         for_each_sg(sgl, sg, sgcnt, i) {
1827                 if (offset < sg->length) {
1828                         *off = offset;
1829                         *sgp = sg;
1830                         return 0;
1831                 }
1832                 offset -= sg->length;
1833         }
1834         return -EFAULT;
1835 }
1836
1837 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1838                                 unsigned int dlen, struct page_frag *frags,
1839                                 int frag_max)
1840 {
1841         unsigned int datalen = dlen;
1842         unsigned int sglen = sg->length - sgoffset;
1843         struct page *page = sg_page(sg);
1844         int i;
1845
1846         i = 0;
1847         do {
1848                 unsigned int copy;
1849
1850                 if (!sglen) {
1851                         sg = sg_next(sg);
1852                         if (!sg) {
1853                                 pr_warn("sg %d NULL, len %u/%u.\n",
1854                                         i, datalen, dlen);
1855                                 return -EINVAL;
1856                         }
1857                         sgoffset = 0;
1858                         sglen = sg->length;
1859                         page = sg_page(sg);
1860
1861                 }
1862                 copy = min(datalen, sglen);
1863                 if (i && page == frags[i - 1].page &&
1864                     sgoffset + sg->offset ==
1865                         frags[i - 1].offset + frags[i - 1].size) {
1866                         frags[i - 1].size += copy;
1867                 } else {
1868                         if (i >= frag_max) {
1869                                 pr_warn("too many pages %u, dlen %u.\n",
1870                                         frag_max, dlen);
1871                                 return -EINVAL;
1872                         }
1873
1874                         frags[i].page = page;
1875                         frags[i].offset = sg->offset + sgoffset;
1876                         frags[i].size = copy;
1877                         i++;
1878                 }
1879                 datalen -= copy;
1880                 sgoffset += copy;
1881                 sglen -= copy;
1882         } while (datalen);
1883
1884         return i;
1885 }
1886
1887 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1888 {
1889         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1890         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1891         struct cxgbi_device *cdev = cconn->chba->cdev;
1892         struct iscsi_conn *conn = task->conn;
1893         struct iscsi_tcp_task *tcp_task = task->dd_data;
1894         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1895         struct scsi_cmnd *sc = task->sc;
1896         struct cxgbi_sock *csk = cconn->cep->csk;
1897         struct net_device *ndev = cdev->ports[csk->port_id];
1898         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1899
1900         tcp_task->dd_data = tdata;
1901         task->hdr = NULL;
1902
1903         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1904             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1905              (opcode == ISCSI_OP_SCSI_CMD &&
1906               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1907                 /* data could goes into skb head */
1908                 headroom += min_t(unsigned int,
1909                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1910                                 conn->max_xmit_dlength);
1911
1912         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1913         if (!tdata->skb) {
1914                 ndev->stats.tx_dropped++;
1915                 return -ENOMEM;
1916         }
1917
1918         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1919
1920         if (task->sc) {
1921                 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1922         } else {
1923                 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1924                 if (!task->hdr) {
1925                         __kfree_skb(tdata->skb);
1926                         tdata->skb = NULL;
1927                         ndev->stats.tx_dropped++;
1928                         return -ENOMEM;
1929                 }
1930         }
1931         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1932
1933         /* data_out uses scsi_cmd's itt */
1934         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1935                 task_reserve_itt(task, &task->hdr->itt);
1936
1937         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1938                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1939                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1940                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1941
1942         return 0;
1943 }
1944 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1945
1946 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1947 {
1948         if (hcrc || dcrc) {
1949                 u8 submode = 0;
1950
1951                 if (hcrc)
1952                         submode |= 1;
1953                 if (dcrc)
1954                         submode |= 2;
1955                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1956         } else
1957                 cxgbi_skcb_ulp_mode(skb) = 0;
1958 }
1959
1960 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1961                               unsigned int count)
1962 {
1963         struct iscsi_conn *conn = task->conn;
1964         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1965         struct sk_buff *skb = tdata->skb;
1966         unsigned int datalen = count;
1967         int i, padlen = iscsi_padding(count);
1968         struct page *pg;
1969
1970         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1971                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1972                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1973                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1974
1975         skb_put(skb, task->hdr_len);
1976         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1977         if (!count)
1978                 return 0;
1979
1980         if (task->sc) {
1981                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1982                 struct scatterlist *sg = NULL;
1983                 int err;
1984
1985                 tdata->offset = offset;
1986                 tdata->count = count;
1987                 err = sgl_seek_offset(
1988                                         sdb->table.sgl, sdb->table.nents,
1989                                         tdata->offset, &tdata->sgoffset, &sg);
1990                 if (err < 0) {
1991                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1992                                 sdb->table.nents, tdata->offset, sdb->length);
1993                         return err;
1994                 }
1995                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1996                                         tdata->frags, MAX_PDU_FRAGS);
1997                 if (err < 0) {
1998                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1999                                 sdb->table.nents, tdata->offset, tdata->count);
2000                         return err;
2001                 }
2002                 tdata->nr_frags = err;
2003
2004                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2005                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2006                         char *dst = skb->data + task->hdr_len;
2007                         struct page_frag *frag = tdata->frags;
2008
2009                         /* data fits in the skb's headroom */
2010                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2011                                 char *src = kmap_atomic(frag->page);
2012
2013                                 memcpy(dst, src+frag->offset, frag->size);
2014                                 dst += frag->size;
2015                                 kunmap_atomic(src);
2016                         }
2017                         if (padlen) {
2018                                 memset(dst, 0, padlen);
2019                                 padlen = 0;
2020                         }
2021                         skb_put(skb, count + padlen);
2022                 } else {
2023                         /* data fit into frag_list */
2024                         for (i = 0; i < tdata->nr_frags; i++) {
2025                                 __skb_fill_page_desc(skb, i,
2026                                                 tdata->frags[i].page,
2027                                                 tdata->frags[i].offset,
2028                                                 tdata->frags[i].size);
2029                                 skb_frag_ref(skb, i);
2030                         }
2031                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2032                         skb->len += count;
2033                         skb->data_len += count;
2034                         skb->truesize += count;
2035                 }
2036
2037         } else {
2038                 pg = virt_to_page(task->data);
2039
2040                 get_page(pg);
2041                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2042                                         count);
2043                 skb->len += count;
2044                 skb->data_len += count;
2045                 skb->truesize += count;
2046         }
2047
2048         if (padlen) {
2049                 i = skb_shinfo(skb)->nr_frags;
2050                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2051                                 virt_to_page(padding), offset_in_page(padding),
2052                                 padlen);
2053
2054                 skb->data_len += padlen;
2055                 skb->truesize += padlen;
2056                 skb->len += padlen;
2057         }
2058
2059         return 0;
2060 }
2061 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2062
2063 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2064 {
2065         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2066         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2067         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2068         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2069         struct sk_buff *skb = tdata->skb;
2070         struct cxgbi_sock *csk = NULL;
2071         unsigned int datalen;
2072         int err;
2073
2074         if (!skb) {
2075                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2076                         "task 0x%p\n", task);
2077                 return 0;
2078         }
2079
2080         if (cconn && cconn->cep)
2081                 csk = cconn->cep->csk;
2082         if (!csk) {
2083                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2084                           "task 0x%p, csk gone.\n", task);
2085                 return -EPIPE;
2086         }
2087
2088         tdata->skb = NULL;
2089         datalen = skb->data_len;
2090
2091         /* write ppod first if using ofldq to write ppod */
2092         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2093                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2094
2095                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2096                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2097                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2098                                task);
2099                         /* continue. Let fl get the data */
2100         }
2101
2102         if (!task->sc)
2103                 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2104
2105         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2106         if (err > 0) {
2107                 int pdulen = err;
2108
2109                 log_debug(1 << CXGBI_DBG_PDU_TX,
2110                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2111                         task, task->sc, skb, skb->len, skb->data_len, err);
2112
2113                 if (task->conn->hdrdgst_en)
2114                         pdulen += ISCSI_DIGEST_SIZE;
2115
2116                 if (datalen && task->conn->datadgst_en)
2117                         pdulen += ISCSI_DIGEST_SIZE;
2118
2119                 task->conn->txdata_octets += pdulen;
2120                 return 0;
2121         }
2122
2123         if (err == -EAGAIN || err == -ENOBUFS) {
2124                 log_debug(1 << CXGBI_DBG_PDU_TX,
2125                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2126                         task, skb, skb->len, skb->data_len, err);
2127                 /* reset skb to send when we are called again */
2128                 tdata->skb = skb;
2129                 return err;
2130         }
2131
2132         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2133                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2134                 task->itt, skb, skb->len, skb->data_len, err);
2135
2136         __kfree_skb(skb);
2137
2138         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2139         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2140         return err;
2141 }
2142 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2143
2144 void cxgbi_cleanup_task(struct iscsi_task *task)
2145 {
2146         struct iscsi_tcp_task *tcp_task = task->dd_data;
2147         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2148
2149         if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2150                 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2151                         task, task->sc, tcp_task,
2152                         tcp_task ? tcp_task->dd_data : NULL, tdata);
2153                 return;
2154         }
2155
2156         log_debug(1 << CXGBI_DBG_ISCSI,
2157                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2158                 task, tdata->skb, task->hdr_itt);
2159
2160         tcp_task->dd_data = NULL;
2161
2162         if (!task->sc)
2163                 kfree(task->hdr);
2164         task->hdr = NULL;
2165
2166         /*  never reached the xmit task callout */
2167         if (tdata->skb) {
2168                 __kfree_skb(tdata->skb);
2169                 tdata->skb = NULL;
2170         }
2171
2172         task_release_itt(task, task->hdr_itt);
2173         memset(tdata, 0, sizeof(*tdata));
2174
2175         iscsi_tcp_cleanup_task(task);
2176 }
2177 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2178
2179 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2180                                 struct iscsi_stats *stats)
2181 {
2182         struct iscsi_conn *conn = cls_conn->dd_data;
2183
2184         stats->txdata_octets = conn->txdata_octets;
2185         stats->rxdata_octets = conn->rxdata_octets;
2186         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2187         stats->dataout_pdus = conn->dataout_pdus_cnt;
2188         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2189         stats->datain_pdus = conn->datain_pdus_cnt;
2190         stats->r2t_pdus = conn->r2t_pdus_cnt;
2191         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2192         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2193         stats->digest_err = 0;
2194         stats->timeout_err = 0;
2195         stats->custom_length = 1;
2196         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2197         stats->custom[0].value = conn->eh_abort_cnt;
2198 }
2199 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2200
2201 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2202 {
2203         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2204         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2205         struct cxgbi_device *cdev = cconn->chba->cdev;
2206         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2207         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2208         unsigned int max = max(max_def, headroom);
2209
2210         max = min(cconn->chba->cdev->tx_max_size, max);
2211         if (conn->max_xmit_dlength)
2212                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2213         else
2214                 conn->max_xmit_dlength = max;
2215         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2216
2217         return 0;
2218 }
2219
2220 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2221 {
2222         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2223         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2224         unsigned int max = cconn->chba->cdev->rx_max_size;
2225
2226         cxgbi_align_pdu_size(max);
2227
2228         if (conn->max_recv_dlength) {
2229                 if (conn->max_recv_dlength > max) {
2230                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2231                                 conn->max_recv_dlength, max);
2232                         return -EINVAL;
2233                 }
2234                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2235                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2236         } else
2237                 conn->max_recv_dlength = max;
2238
2239         return 0;
2240 }
2241
2242 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2243                         enum iscsi_param param, char *buf, int buflen)
2244 {
2245         struct iscsi_conn *conn = cls_conn->dd_data;
2246         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2247         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2248         struct cxgbi_sock *csk = cconn->cep->csk;
2249         int err;
2250
2251         log_debug(1 << CXGBI_DBG_ISCSI,
2252                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2253                 cls_conn, param, buflen, buf);
2254
2255         switch (param) {
2256         case ISCSI_PARAM_HDRDGST_EN:
2257                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2258                 if (!err && conn->hdrdgst_en)
2259                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2260                                                         conn->hdrdgst_en,
2261                                                         conn->datadgst_en);
2262                 break;
2263         case ISCSI_PARAM_DATADGST_EN:
2264                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2265                 if (!err && conn->datadgst_en)
2266                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2267                                                         conn->hdrdgst_en,
2268                                                         conn->datadgst_en);
2269                 break;
2270         case ISCSI_PARAM_MAX_R2T:
2271                 return iscsi_tcp_set_max_r2t(conn, buf);
2272         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2273                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2274                 if (!err)
2275                         err = cxgbi_conn_max_recv_dlength(conn);
2276                 break;
2277         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2278                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2279                 if (!err)
2280                         err = cxgbi_conn_max_xmit_dlength(conn);
2281                 break;
2282         default:
2283                 return iscsi_set_param(cls_conn, param, buf, buflen);
2284         }
2285         return err;
2286 }
2287 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2288
2289 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2290 {
2291         int len;
2292
2293         cxgbi_sock_get(csk);
2294         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2295         cxgbi_sock_put(csk);
2296
2297         return len;
2298 }
2299
2300 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2301 {
2302         int len;
2303
2304         cxgbi_sock_get(csk);
2305         if (csk->csk_family == AF_INET)
2306                 len = sprintf(buf, "%pI4",
2307                               &csk->daddr.sin_addr.s_addr);
2308         else
2309                 len = sprintf(buf, "%pI6",
2310                               &csk->daddr6.sin6_addr);
2311
2312         cxgbi_sock_put(csk);
2313
2314         return len;
2315 }
2316
2317 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2318                        char *buf)
2319 {
2320         struct cxgbi_endpoint *cep = ep->dd_data;
2321         struct cxgbi_sock *csk;
2322         int len;
2323
2324         log_debug(1 << CXGBI_DBG_ISCSI,
2325                 "cls_conn 0x%p, param %d.\n", ep, param);
2326
2327         switch (param) {
2328         case ISCSI_PARAM_CONN_PORT:
2329         case ISCSI_PARAM_CONN_ADDRESS:
2330                 if (!cep)
2331                         return -ENOTCONN;
2332
2333                 csk = cep->csk;
2334                 if (!csk)
2335                         return -ENOTCONN;
2336
2337                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2338                                                  &csk->daddr, param, buf);
2339         default:
2340                 return -ENOSYS;
2341         }
2342         return len;
2343 }
2344 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2345
2346 struct iscsi_cls_conn *
2347 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2348 {
2349         struct iscsi_cls_conn *cls_conn;
2350         struct iscsi_conn *conn;
2351         struct iscsi_tcp_conn *tcp_conn;
2352         struct cxgbi_conn *cconn;
2353
2354         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2355         if (!cls_conn)
2356                 return NULL;
2357
2358         conn = cls_conn->dd_data;
2359         tcp_conn = conn->dd_data;
2360         cconn = tcp_conn->dd_data;
2361         cconn->iconn = conn;
2362
2363         log_debug(1 << CXGBI_DBG_ISCSI,
2364                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2365                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2366
2367         return cls_conn;
2368 }
2369 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2370
2371 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2372                                 struct iscsi_cls_conn *cls_conn,
2373                                 u64 transport_eph, int is_leading)
2374 {
2375         struct iscsi_conn *conn = cls_conn->dd_data;
2376         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2377         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2378         struct cxgbi_ppm *ppm;
2379         struct iscsi_endpoint *ep;
2380         struct cxgbi_endpoint *cep;
2381         struct cxgbi_sock *csk;
2382         int err;
2383
2384         ep = iscsi_lookup_endpoint(transport_eph);
2385         if (!ep)
2386                 return -EINVAL;
2387
2388         /*  setup ddp pagesize */
2389         cep = ep->dd_data;
2390         csk = cep->csk;
2391
2392         ppm = csk->cdev->cdev2ppm(csk->cdev);
2393         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2394                                              ppm->tformat.pgsz_idx_dflt);
2395         if (err < 0)
2396                 return err;
2397
2398         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2399         if (err)
2400                 return -EINVAL;
2401
2402         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2403         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2404
2405         write_lock_bh(&csk->callback_lock);
2406         csk->user_data = conn;
2407         cconn->chba = cep->chba;
2408         cconn->cep = cep;
2409         cep->cconn = cconn;
2410         write_unlock_bh(&csk->callback_lock);
2411
2412         cxgbi_conn_max_xmit_dlength(conn);
2413         cxgbi_conn_max_recv_dlength(conn);
2414
2415         log_debug(1 << CXGBI_DBG_ISCSI,
2416                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2417                 cls_session, cls_conn, ep, cconn, csk);
2418         /*  init recv engine */
2419         iscsi_tcp_hdr_recv_prep(tcp_conn);
2420
2421         return 0;
2422 }
2423 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2424
2425 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2426                                                 u16 cmds_max, u16 qdepth,
2427                                                 u32 initial_cmdsn)
2428 {
2429         struct cxgbi_endpoint *cep;
2430         struct cxgbi_hba *chba;
2431         struct Scsi_Host *shost;
2432         struct iscsi_cls_session *cls_session;
2433         struct iscsi_session *session;
2434
2435         if (!ep) {
2436                 pr_err("missing endpoint.\n");
2437                 return NULL;
2438         }
2439
2440         cep = ep->dd_data;
2441         chba = cep->chba;
2442         shost = chba->shost;
2443
2444         BUG_ON(chba != iscsi_host_priv(shost));
2445
2446         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2447                                         cmds_max, 0,
2448                                         sizeof(struct iscsi_tcp_task) +
2449                                         sizeof(struct cxgbi_task_data),
2450                                         initial_cmdsn, ISCSI_MAX_TARGET);
2451         if (!cls_session)
2452                 return NULL;
2453
2454         session = cls_session->dd_data;
2455         if (iscsi_tcp_r2tpool_alloc(session))
2456                 goto remove_session;
2457
2458         log_debug(1 << CXGBI_DBG_ISCSI,
2459                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2460         return cls_session;
2461
2462 remove_session:
2463         iscsi_session_teardown(cls_session);
2464         return NULL;
2465 }
2466 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2467
2468 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2469 {
2470         log_debug(1 << CXGBI_DBG_ISCSI,
2471                 "cls sess 0x%p.\n", cls_session);
2472
2473         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2474         iscsi_session_teardown(cls_session);
2475 }
2476 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2477
2478 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2479                         char *buf, int buflen)
2480 {
2481         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2482
2483         if (!chba->ndev) {
2484                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2485                                 "netdev for host not set.\n");
2486                 return -ENODEV;
2487         }
2488
2489         log_debug(1 << CXGBI_DBG_ISCSI,
2490                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2491                 shost, chba, chba->ndev->name, param, buflen, buf);
2492
2493         switch (param) {
2494         case ISCSI_HOST_PARAM_IPADDRESS:
2495         {
2496                 __be32 addr = in_aton(buf);
2497                 log_debug(1 << CXGBI_DBG_ISCSI,
2498                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2499                 cxgbi_set_iscsi_ipv4(chba, addr);
2500                 return 0;
2501         }
2502         case ISCSI_HOST_PARAM_HWADDRESS:
2503         case ISCSI_HOST_PARAM_NETDEV_NAME:
2504                 return 0;
2505         default:
2506                 return iscsi_host_set_param(shost, param, buf, buflen);
2507         }
2508 }
2509 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2510
2511 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2512                         char *buf)
2513 {
2514         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2515         int len = 0;
2516
2517         if (!chba->ndev) {
2518                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2519                                 "netdev for host not set.\n");
2520                 return -ENODEV;
2521         }
2522
2523         log_debug(1 << CXGBI_DBG_ISCSI,
2524                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2525                 shost, chba, chba->ndev->name, param);
2526
2527         switch (param) {
2528         case ISCSI_HOST_PARAM_HWADDRESS:
2529                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2530                 break;
2531         case ISCSI_HOST_PARAM_NETDEV_NAME:
2532                 len = sprintf(buf, "%s\n", chba->ndev->name);
2533                 break;
2534         case ISCSI_HOST_PARAM_IPADDRESS:
2535         {
2536                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2537                                                            chba->port_id);
2538                 if (csk) {
2539                         len = sprintf(buf, "%pIS",
2540                                       (struct sockaddr *)&csk->saddr);
2541                 }
2542                 log_debug(1 << CXGBI_DBG_ISCSI,
2543                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2544                 break;
2545         }
2546         default:
2547                 return iscsi_host_get_param(shost, param, buf);
2548         }
2549
2550         return len;
2551 }
2552 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2553
2554 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2555                                         struct sockaddr *dst_addr,
2556                                         int non_blocking)
2557 {
2558         struct iscsi_endpoint *ep;
2559         struct cxgbi_endpoint *cep;
2560         struct cxgbi_hba *hba = NULL;
2561         struct cxgbi_sock *csk;
2562         int ifindex = 0;
2563         int err = -EINVAL;
2564
2565         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2566                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2567                 shost, non_blocking, dst_addr);
2568
2569         if (shost) {
2570                 hba = iscsi_host_priv(shost);
2571                 if (!hba) {
2572                         pr_info("shost 0x%p, priv NULL.\n", shost);
2573                         goto err_out;
2574                 }
2575
2576                 rtnl_lock();
2577                 if (!vlan_uses_dev(hba->ndev))
2578                         ifindex = hba->ndev->ifindex;
2579                 rtnl_unlock();
2580         }
2581
2582         if (dst_addr->sa_family == AF_INET) {
2583                 csk = cxgbi_check_route(dst_addr, ifindex);
2584 #if IS_ENABLED(CONFIG_IPV6)
2585         } else if (dst_addr->sa_family == AF_INET6) {
2586                 csk = cxgbi_check_route6(dst_addr, ifindex);
2587 #endif
2588         } else {
2589                 pr_info("address family 0x%x NOT supported.\n",
2590                         dst_addr->sa_family);
2591                 err = -EAFNOSUPPORT;
2592                 return (struct iscsi_endpoint *)ERR_PTR(err);
2593         }
2594
2595         if (IS_ERR(csk))
2596                 return (struct iscsi_endpoint *)csk;
2597         cxgbi_sock_get(csk);
2598
2599         if (!hba)
2600                 hba = csk->cdev->hbas[csk->port_id];
2601         else if (hba != csk->cdev->hbas[csk->port_id]) {
2602                 pr_info("Could not connect through requested host %u"
2603                         "hba 0x%p != 0x%p (%u).\n",
2604                         shost->host_no, hba,
2605                         csk->cdev->hbas[csk->port_id], csk->port_id);
2606                 err = -ENOSPC;
2607                 goto release_conn;
2608         }
2609
2610         err = sock_get_port(csk);
2611         if (err)
2612                 goto release_conn;
2613
2614         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2615         err = csk->cdev->csk_init_act_open(csk);
2616         if (err)
2617                 goto release_conn;
2618
2619         if (cxgbi_sock_is_closing(csk)) {
2620                 err = -ENOSPC;
2621                 pr_info("csk 0x%p is closing.\n", csk);
2622                 goto release_conn;
2623         }
2624
2625         ep = iscsi_create_endpoint(sizeof(*cep));
2626         if (!ep) {
2627                 err = -ENOMEM;
2628                 pr_info("iscsi alloc ep, OOM.\n");
2629                 goto release_conn;
2630         }
2631
2632         cep = ep->dd_data;
2633         cep->csk = csk;
2634         cep->chba = hba;
2635
2636         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2637                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2638                 ep, cep, csk, hba, hba->ndev->name);
2639         return ep;
2640
2641 release_conn:
2642         cxgbi_sock_put(csk);
2643         cxgbi_sock_closed(csk);
2644 err_out:
2645         return ERR_PTR(err);
2646 }
2647 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2648
2649 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2650 {
2651         struct cxgbi_endpoint *cep = ep->dd_data;
2652         struct cxgbi_sock *csk = cep->csk;
2653
2654         if (!cxgbi_sock_is_established(csk))
2655                 return 0;
2656         return 1;
2657 }
2658 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2659
2660 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2661 {
2662         struct cxgbi_endpoint *cep = ep->dd_data;
2663         struct cxgbi_conn *cconn = cep->cconn;
2664         struct cxgbi_sock *csk = cep->csk;
2665
2666         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2667                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2668                 ep, cep, cconn, csk, csk->state, csk->flags);
2669
2670         if (cconn && cconn->iconn) {
2671                 iscsi_suspend_tx(cconn->iconn);
2672                 write_lock_bh(&csk->callback_lock);
2673                 cep->csk->user_data = NULL;
2674                 cconn->cep = NULL;
2675                 write_unlock_bh(&csk->callback_lock);
2676         }
2677         iscsi_destroy_endpoint(ep);
2678
2679         if (likely(csk->state >= CTP_ESTABLISHED))
2680                 need_active_close(csk);
2681         else
2682                 cxgbi_sock_closed(csk);
2683
2684         cxgbi_sock_put(csk);
2685 }
2686 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2687
2688 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2689                         struct scsi_transport_template **stt)
2690 {
2691         *stt = iscsi_register_transport(itp);
2692         if (*stt == NULL) {
2693                 pr_err("unable to register %s transport 0x%p.\n",
2694                         itp->name, itp);
2695                 return -ENODEV;
2696         }
2697         log_debug(1 << CXGBI_DBG_ISCSI,
2698                 "%s, registered iscsi transport 0x%p.\n",
2699                 itp->name, stt);
2700         return 0;
2701 }
2702 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2703
2704 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2705                         struct scsi_transport_template **stt)
2706 {
2707         if (*stt) {
2708                 log_debug(1 << CXGBI_DBG_ISCSI,
2709                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2710                         itp, itp->name, *stt);
2711                 *stt = NULL;
2712                 iscsi_unregister_transport(itp);
2713         }
2714 }
2715 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2716
2717 umode_t cxgbi_attr_is_visible(int param_type, int param)
2718 {
2719         switch (param_type) {
2720         case ISCSI_HOST_PARAM:
2721                 switch (param) {
2722                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2723                 case ISCSI_HOST_PARAM_HWADDRESS:
2724                 case ISCSI_HOST_PARAM_IPADDRESS:
2725                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2726                         return S_IRUGO;
2727                 default:
2728                         return 0;
2729                 }
2730         case ISCSI_PARAM:
2731                 switch (param) {
2732                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2733                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2734                 case ISCSI_PARAM_HDRDGST_EN:
2735                 case ISCSI_PARAM_DATADGST_EN:
2736                 case ISCSI_PARAM_CONN_ADDRESS:
2737                 case ISCSI_PARAM_CONN_PORT:
2738                 case ISCSI_PARAM_EXP_STATSN:
2739                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2740                 case ISCSI_PARAM_PERSISTENT_PORT:
2741                 case ISCSI_PARAM_PING_TMO:
2742                 case ISCSI_PARAM_RECV_TMO:
2743                 case ISCSI_PARAM_INITIAL_R2T_EN:
2744                 case ISCSI_PARAM_MAX_R2T:
2745                 case ISCSI_PARAM_IMM_DATA_EN:
2746                 case ISCSI_PARAM_FIRST_BURST:
2747                 case ISCSI_PARAM_MAX_BURST:
2748                 case ISCSI_PARAM_PDU_INORDER_EN:
2749                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2750                 case ISCSI_PARAM_ERL:
2751                 case ISCSI_PARAM_TARGET_NAME:
2752                 case ISCSI_PARAM_TPGT:
2753                 case ISCSI_PARAM_USERNAME:
2754                 case ISCSI_PARAM_PASSWORD:
2755                 case ISCSI_PARAM_USERNAME_IN:
2756                 case ISCSI_PARAM_PASSWORD_IN:
2757                 case ISCSI_PARAM_FAST_ABORT:
2758                 case ISCSI_PARAM_ABORT_TMO:
2759                 case ISCSI_PARAM_LU_RESET_TMO:
2760                 case ISCSI_PARAM_TGT_RESET_TMO:
2761                 case ISCSI_PARAM_IFACE_NAME:
2762                 case ISCSI_PARAM_INITIATOR_NAME:
2763                         return S_IRUGO;
2764                 default:
2765                         return 0;
2766                 }
2767         }
2768
2769         return 0;
2770 }
2771 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2772
2773 static int __init libcxgbi_init_module(void)
2774 {
2775         pr_info("%s", version);
2776
2777         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2778                      sizeof(struct cxgbi_skb_cb));
2779         return 0;
2780 }
2781
2782 static void __exit libcxgbi_exit_module(void)
2783 {
2784         cxgbi_device_unregister_all(0xFF);
2785         return;
2786 }
2787
2788 module_init(libcxgbi_init_module);
2789 module_exit(libcxgbi_exit_module);