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         cxgbi_ppm_release(cdev->cdev2ppm(cdev));
 125         if (cdev->pmap.max_connect)
 126                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 127         kfree(cdev);
 128 }
 129
 130 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 131                                            unsigned int nports)
 132 {
 133         struct cxgbi_device *cdev;
 134
 135         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 136                         (sizeof(struct cxgbi_hba *) +
 137                          sizeof(struct net_device *)),
 138                         GFP_KERNEL);
 139         if (!cdev) {
 140                 pr_warn("nport %d, OOM.\n", nports);
 141                 return NULL;
 142         }
 143         cdev->ports = (struct net_device **)(cdev + 1);
 144         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 145                                                 sizeof(struct net_device *));
 146         if (extra)
 147                 cdev->dd_data = ((char *)cdev->hbas) +
 148                                 nports * sizeof(struct cxgbi_hba *);
 149         spin_lock_init(&cdev->pmap.lock);
 150
 151         mutex_lock(&cdev_mutex);
 152         list_add_tail(&cdev->list_head, &cdev_list);
 153         mutex_unlock(&cdev_mutex);
 154
 155         spin_lock(&cdev_rcu_lock);
 156         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 157         spin_unlock(&cdev_rcu_lock);
 158
 159         log_debug(1 << CXGBI_DBG_DEV,
 160                 "cdev 0x%p, p# %u.\n", cdev, nports);
 161         return cdev;
 162 }
 163 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 164
 165 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 166 {
 167         log_debug(1 << CXGBI_DBG_DEV,
 168                 "cdev 0x%p, p# %u,%s.\n",
 169                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 170
 171         mutex_lock(&cdev_mutex);
 172         list_del(&cdev->list_head);
 173         mutex_unlock(&cdev_mutex);
 174
 175         spin_lock(&cdev_rcu_lock);
 176         list_del_rcu(&cdev->rcu_node);
 177         spin_unlock(&cdev_rcu_lock);
 178         synchronize_rcu();
 179
 180         cxgbi_device_destroy(cdev);
 181 }
 182 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 183
 184 void cxgbi_device_unregister_all(unsigned int flag)
 185 {
 186         struct cxgbi_device *cdev, *tmp;
 187
 188         mutex_lock(&cdev_mutex);
 189         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 190                 if ((cdev->flags & flag) == flag) {
 191                         mutex_unlock(&cdev_mutex);
 192                         cxgbi_device_unregister(cdev);
 193                         mutex_lock(&cdev_mutex);
 194                 }
 195         }
 196         mutex_unlock(&cdev_mutex);
 197 }
 198 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 199
 200 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 201 {
 202         struct cxgbi_device *cdev, *tmp;
 203
 204         mutex_lock(&cdev_mutex);
 205         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 206                 if (cdev->lldev == lldev) {
 207                         mutex_unlock(&cdev_mutex);
 208                         return cdev;
 209                 }
 210         }
 211         mutex_unlock(&cdev_mutex);
 212
 213         log_debug(1 << CXGBI_DBG_DEV,
 214                 "lldev 0x%p, NO match found.\n", lldev);
 215         return NULL;
 216 }
 217 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 218
 219 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 220                                                  int *port)
 221 {
 222         struct net_device *vdev = NULL;
 223         struct cxgbi_device *cdev, *tmp;
 224         int i;
 225
 226         if (is_vlan_dev(ndev)) {
 227                 vdev = ndev;
 228                 ndev = vlan_dev_real_dev(ndev);
 229                 log_debug(1 << CXGBI_DBG_DEV,
 230                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 231         }
 232
 233         mutex_lock(&cdev_mutex);
 234         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 235                 for (i = 0; i < cdev->nports; i++) {
 236                         if (ndev == cdev->ports[i]) {
 237                                 cdev->hbas[i]->vdev = vdev;
 238                                 mutex_unlock(&cdev_mutex);
 239                                 if (port)
 240                                         *port = i;
 241                                 return cdev;
 242                         }
 243                 }
 244         }
 245         mutex_unlock(&cdev_mutex);
 246         log_debug(1 << CXGBI_DBG_DEV,
 247                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 248         return NULL;
 249 }
 250 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 251
 252 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 253                                                      int *port)
 254 {
 255         struct net_device *vdev = NULL;
 256         struct cxgbi_device *cdev;
 257         int i;
 258
 259         if (is_vlan_dev(ndev)) {
 260                 vdev = ndev;
 261                 ndev = vlan_dev_real_dev(ndev);
 262                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 263         }
 264
 265         rcu_read_lock();
 266         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 267                 for (i = 0; i < cdev->nports; i++) {
 268                         if (ndev == cdev->ports[i]) {
 269                                 cdev->hbas[i]->vdev = vdev;
 270                                 rcu_read_unlock();
 271                                 if (port)
 272                                         *port = i;
 273                                 return cdev;
 274                         }
 275                 }
 276         }
 277         rcu_read_unlock();
 278
 279         log_debug(1 << CXGBI_DBG_DEV,
 280                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 281         return NULL;
 282 }
 283 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 284
 285 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 286                                                      int *port)
 287 {
 288         struct net_device *vdev = NULL;
 289         struct cxgbi_device *cdev, *tmp;
 290         int i;
 291
 292         if (is_vlan_dev(ndev)) {
 293                 vdev = ndev;
 294                 ndev = vlan_dev_real_dev(ndev);
 295                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 296         }
 297
 298         mutex_lock(&cdev_mutex);
 299         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 300                 for (i = 0; i < cdev->nports; i++) {
 301                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 302                                     MAX_ADDR_LEN)) {
 303                                 cdev->hbas[i]->vdev = vdev;
 304                                 mutex_unlock(&cdev_mutex);
 305                                 if (port)
 306                                         *port = i;
 307                                 return cdev;
 308                         }
 309                 }
 310         }
 311         mutex_unlock(&cdev_mutex);
 312         log_debug(1 << CXGBI_DBG_DEV,
 313                   "ndev 0x%p, %s, NO match mac found.\n",
 314                   ndev, ndev->name);
 315         return NULL;
 316 }
 317
 318 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 319 {
 320         int i;
 321         struct cxgbi_hba *chba;
 322
 323         log_debug(1 << CXGBI_DBG_DEV,
 324                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 325
 326         for (i = 0; i < cdev->nports; i++) {
 327                 chba = cdev->hbas[i];
 328                 if (chba) {
 329                         cdev->hbas[i] = NULL;
 330                         iscsi_host_remove(chba->shost);
 331                         pci_dev_put(cdev->pdev);
 332                         iscsi_host_free(chba->shost);
 333                 }
 334         }
 335 }
 336 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 337
 338 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 339                 unsigned int max_id, struct scsi_host_template *sht,
 340                 struct scsi_transport_template *stt)
 341 {
 342         struct cxgbi_hba *chba;
 343         struct Scsi_Host *shost;
 344         int i, err;
 345
 346         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 347
 348         for (i = 0; i < cdev->nports; i++) {
 349                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 350                 if (!shost) {
 351                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 352                                 cdev, i, cdev->ports[i]->name);
 353                         err = -ENOMEM;
 354                         goto err_out;
 355                 }
 356
 357                 shost->transportt = stt;
 358                 shost->max_lun = max_lun;
 359                 shost->max_id = max_id;
 360                 shost->max_channel = 0;
 361                 shost->max_cmd_len = 16;
 362
 363                 chba = iscsi_host_priv(shost);
 364                 chba->cdev = cdev;
 365                 chba->ndev = cdev->ports[i];
 366                 chba->shost = shost;
 367
 368                 log_debug(1 << CXGBI_DBG_DEV,
 369                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 370                         cdev, i, cdev->ports[i]->name, chba);
 371
 372                 pci_dev_get(cdev->pdev);
 373                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 374                 if (err) {
 375                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 376                                 cdev, i, cdev->ports[i]->name);
 377                         pci_dev_put(cdev->pdev);
 378                         scsi_host_put(shost);
 379                         goto  err_out;
 380                 }
 381
 382                 cdev->hbas[i] = chba;
 383         }
 384
 385         return 0;
 386
 387 err_out:
 388         cxgbi_hbas_remove(cdev);
 389         return err;
 390 }
 391 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 392
 393 /*
 394  * iSCSI offload
 395  *
 396  * - source port management
 397  *   To find a free source port in the port allocation map we use a very simple
 398  *   rotor scheme to look for the next free port.
 399  *
 400  *   If a source port has been specified make sure that it doesn't collide with
 401  *   our normal source port allocation map.  If it's outside the range of our
 402  *   allocation/deallocation scheme just let them use it.
 403  *
 404  *   If the source port is outside our allocation range, the caller is
 405  *   responsible for keeping track of their port usage.
 406  */
 407
 408 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 409                                             unsigned char port_id)
 410 {
 411         struct cxgbi_ports_map *pmap = &cdev->pmap;
 412         unsigned int i;
 413         unsigned int used;
 414
 415         if (!pmap->max_connect || !pmap->used)
 416                 return NULL;
 417
 418         spin_lock_bh(&pmap->lock);
 419         used = pmap->used;
 420         for (i = 0; used && i < pmap->max_connect; i++) {
 421                 struct cxgbi_sock *csk = pmap->port_csk[i];
 422
 423                 if (csk) {
 424                         if (csk->port_id == port_id) {
 425                                 spin_unlock_bh(&pmap->lock);
 426                                 return csk;
 427                         }
 428                         used--;
 429                 }
 430         }
 431         spin_unlock_bh(&pmap->lock);
 432
 433         return NULL;
 434 }
 435
 436 static int sock_get_port(struct cxgbi_sock *csk)
 437 {
 438         struct cxgbi_device *cdev = csk->cdev;
 439         struct cxgbi_ports_map *pmap = &cdev->pmap;
 440         unsigned int start;
 441         int idx;
 442         __be16 *port;
 443
 444         if (!pmap->max_connect) {
 445                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 446                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 447                 return -EADDRNOTAVAIL;
 448         }
 449
 450         if (csk->csk_family == AF_INET)
 451                 port = &csk->saddr.sin_port;
 452         else /* ipv6 */
 453                 port = &csk->saddr6.sin6_port;
 454
 455         if (*port) {
 456                 pr_err("source port NON-ZERO %u.\n",
 457                         ntohs(*port));
 458                 return -EADDRINUSE;
 459         }
 460
 461         spin_lock_bh(&pmap->lock);
 462         if (pmap->used >= pmap->max_connect) {
 463                 spin_unlock_bh(&pmap->lock);
 464                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 465                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 466                 return -EADDRNOTAVAIL;
 467         }
 468
 469         start = idx = pmap->next;
 470         do {
 471                 if (++idx >= pmap->max_connect)
 472                         idx = 0;
 473                 if (!pmap->port_csk[idx]) {
 474                         pmap->used++;
 475                         *port = htons(pmap->sport_base + idx);
 476                         pmap->next = idx;
 477                         pmap->port_csk[idx] = csk;
 478                         spin_unlock_bh(&pmap->lock);
 479                         cxgbi_sock_get(csk);
 480                         log_debug(1 << CXGBI_DBG_SOCK,
 481                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 482                                 cdev, csk->port_id,
 483                                 cdev->ports[csk->port_id]->name,
 484                                 pmap->sport_base + idx, pmap->next);
 485                         return 0;
 486                 }
 487         } while (idx != start);
 488         spin_unlock_bh(&pmap->lock);
 489
 490         /* should not happen */
 491         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 492                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 493                 pmap->next);
 494         return -EADDRNOTAVAIL;
 495 }
 496
 497 static void sock_put_port(struct cxgbi_sock *csk)
 498 {
 499         struct cxgbi_device *cdev = csk->cdev;
 500         struct cxgbi_ports_map *pmap = &cdev->pmap;
 501         __be16 *port;
 502
 503         if (csk->csk_family == AF_INET)
 504                 port = &csk->saddr.sin_port;
 505         else /* ipv6 */
 506                 port = &csk->saddr6.sin6_port;
 507
 508         if (*port) {
 509                 int idx = ntohs(*port) - pmap->sport_base;
 510
 511                 *port = 0;
 512                 if (idx < 0 || idx >= pmap->max_connect) {
 513                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 514                                 cdev, csk->port_id,
 515                                 cdev->ports[csk->port_id]->name,
 516                                 ntohs(*port));
 517                         return;
 518                 }
 519
 520                 spin_lock_bh(&pmap->lock);
 521                 pmap->port_csk[idx] = NULL;
 522                 pmap->used--;
 523                 spin_unlock_bh(&pmap->lock);
 524
 525                 log_debug(1 << CXGBI_DBG_SOCK,
 526                         "cdev 0x%p, p#%u %s, release %u.\n",
 527                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 528                         pmap->sport_base + idx);
 529
 530                 cxgbi_sock_put(csk);
 531         }
 532 }
 533
 534 /*
 535  * iscsi tcp connection
 536  */
 537 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 538 {
 539         if (csk->cpl_close) {
 540                 kfree_skb(csk->cpl_close);
 541                 csk->cpl_close = NULL;
 542         }
 543         if (csk->cpl_abort_req) {
 544                 kfree_skb(csk->cpl_abort_req);
 545                 csk->cpl_abort_req = NULL;
 546         }
 547         if (csk->cpl_abort_rpl) {
 548                 kfree_skb(csk->cpl_abort_rpl);
 549                 csk->cpl_abort_rpl = NULL;
 550         }
 551 }
 552 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 553
 554 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 555 {
 556         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 557
 558         if (!csk) {
 559                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 560                 return NULL;
 561         }
 562
 563         if (cdev->csk_alloc_cpls(csk) < 0) {
 564                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 565                 kfree(csk);
 566                 return NULL;
 567         }
 568
 569         spin_lock_init(&csk->lock);
 570         kref_init(&csk->refcnt);
 571         skb_queue_head_init(&csk->receive_queue);
 572         skb_queue_head_init(&csk->write_queue);
 573         timer_setup(&csk->retry_timer, NULL, 0);
 574         init_completion(&csk->cmpl);
 575         rwlock_init(&csk->callback_lock);
 576         csk->cdev = cdev;
 577         csk->flags = 0;
 578         cxgbi_sock_set_state(csk, CTP_CLOSED);
 579
 580         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 581
 582         return csk;
 583 }
 584
 585 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 586                                       __be32 saddr, __be32 daddr,
 587                                       __be16 sport, __be16 dport, u8 tos,
 588                                       int ifindex)
 589 {
 590         struct rtable *rt;
 591
 592         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 593                                    dport, sport, IPPROTO_TCP, tos, ifindex);
 594         if (IS_ERR(rt))
 595                 return NULL;
 596
 597         return rt;
 598 }
 599
 600 static struct cxgbi_sock *
 601 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
 602 {
 603         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 604         struct dst_entry *dst;
 605         struct net_device *ndev;
 606         struct cxgbi_device *cdev;
 607         struct rtable *rt = NULL;
 608         struct neighbour *n;
 609         struct flowi4 fl4;
 610         struct cxgbi_sock *csk = NULL;
 611         unsigned int mtu = 0;
 612         int port = 0xFFFF;
 613         int err = 0;
 614
 615         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
 616                              daddr->sin_port, 0, ifindex);
 617         if (!rt) {
 618                 pr_info("no route to ipv4 0x%x, port %u.\n",
 619                         be32_to_cpu(daddr->sin_addr.s_addr),
 620                         be16_to_cpu(daddr->sin_port));
 621                 err = -ENETUNREACH;
 622                 goto err_out;
 623         }
 624         dst = &rt->dst;
 625         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 626         if (!n) {
 627                 err = -ENODEV;
 628                 goto rel_rt;
 629         }
 630         ndev = n->dev;
 631
 632         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 633                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 634                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 635                         ndev->name);
 636                 err = -ENETUNREACH;
 637                 goto rel_neigh;
 638         }
 639
 640         if (ndev->flags & IFF_LOOPBACK) {
 641                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 642                 if (!ndev) {
 643                         err = -ENETUNREACH;
 644                         goto rel_neigh;
 645                 }
 646                 mtu = ndev->mtu;
 647                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 648                         n->dev->name, ndev->name, mtu);
 649         }
 650
 651         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 652                 pr_info("%s interface not up.\n", ndev->name);
 653                 err = -ENETDOWN;
 654                 goto rel_neigh;
 655         }
 656
 657         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 658         if (!cdev)
 659                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 660         if (!cdev) {
 661                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 662                         &daddr->sin_addr.s_addr, ndev->name);
 663                 err = -ENETUNREACH;
 664                 goto rel_neigh;
 665         }
 666         log_debug(1 << CXGBI_DBG_SOCK,
 667                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 668                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 669                            port, ndev->name, cdev);
 670
 671         csk = cxgbi_sock_create(cdev);
 672         if (!csk) {
 673                 err = -ENOMEM;
 674                 goto rel_neigh;
 675         }
 676         csk->cdev = cdev;
 677         csk->port_id = port;
 678         csk->mtu = mtu;
 679         csk->dst = dst;
 680
 681         csk->csk_family = AF_INET;
 682         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 683         csk->daddr.sin_port = daddr->sin_port;
 684         csk->daddr.sin_family = daddr->sin_family;
 685         csk->saddr.sin_family = daddr->sin_family;
 686         csk->saddr.sin_addr.s_addr = fl4.saddr;
 687         neigh_release(n);
 688
 689         return csk;
 690
 691 rel_neigh:
 692         neigh_release(n);
 693
 694 rel_rt:
 695         ip_rt_put(rt);
 696 err_out:
 697         return ERR_PTR(err);
 698 }
 699
 700 #if IS_ENABLED(CONFIG_IPV6)
 701 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 702                                         const struct in6_addr *daddr,
 703                                         int ifindex)
 704 {
 705         struct flowi6 fl;
 706
 707         memset(&fl, 0, sizeof(fl));
 708         fl.flowi6_oif = ifindex;
 709         if (saddr)
 710                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 711         if (daddr)
 712                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 713         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 714 }
 715
 716 static struct cxgbi_sock *
 717 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
 718 {
 719         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 720         struct dst_entry *dst;
 721         struct net_device *ndev;
 722         struct cxgbi_device *cdev;
 723         struct rt6_info *rt = NULL;
 724         struct neighbour *n;
 725         struct in6_addr pref_saddr;
 726         struct cxgbi_sock *csk = NULL;
 727         unsigned int mtu = 0;
 728         int port = 0xFFFF;
 729         int err = 0;
 730
 731         rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
 732
 733         if (!rt) {
 734                 pr_info("no route to ipv6 %pI6 port %u\n",
 735                         daddr6->sin6_addr.s6_addr,
 736                         be16_to_cpu(daddr6->sin6_port));
 737                 err = -ENETUNREACH;
 738                 goto err_out;
 739         }
 740
 741         dst = &rt->dst;
 742
 743         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 744
 745         if (!n) {
 746                 pr_info("%pI6, port %u, dst no neighbour.\n",
 747                         daddr6->sin6_addr.s6_addr,
 748                         be16_to_cpu(daddr6->sin6_port));
 749                 err = -ENETUNREACH;
 750                 goto rel_rt;
 751         }
 752         ndev = n->dev;
 753
 754         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 755                 pr_info("%s interface not up.\n", ndev->name);
 756                 err = -ENETDOWN;
 757                 goto rel_rt;
 758         }
 759
 760         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 761                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 762                         daddr6->sin6_addr.s6_addr,
 763                         ntohs(daddr6->sin6_port), ndev->name);
 764                 err = -ENETUNREACH;
 765                 goto rel_rt;
 766         }
 767
 768         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 769         if (!cdev)
 770                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 771         if (!cdev) {
 772                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 773                         daddr6->sin6_addr.s6_addr, ndev->name);
 774                 err = -ENETUNREACH;
 775                 goto rel_rt;
 776         }
 777         log_debug(1 << CXGBI_DBG_SOCK,
 778                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 779                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 780                   ndev->name, cdev);
 781
 782         csk = cxgbi_sock_create(cdev);
 783         if (!csk) {
 784                 err = -ENOMEM;
 785                 goto rel_rt;
 786         }
 787         csk->cdev = cdev;
 788         csk->port_id = port;
 789         csk->mtu = mtu;
 790         csk->dst = dst;
 791
 792         rt6_get_prefsrc(rt, &pref_saddr);
 793         if (ipv6_addr_any(&pref_saddr)) {
 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         }
 804
 805         csk->csk_family = AF_INET6;
 806         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 807         csk->daddr6.sin6_port = daddr6->sin6_port;
 808         csk->daddr6.sin6_family = daddr6->sin6_family;
 809         csk->saddr6.sin6_family = daddr6->sin6_family;
 810         csk->saddr6.sin6_addr = pref_saddr;
 811
 812         neigh_release(n);
 813         return csk;
 814
 815 rel_rt:
 816         if (n)
 817                 neigh_release(n);
 818
 819         ip6_rt_put(rt);
 820         if (csk)
 821                 cxgbi_sock_closed(csk);
 822 err_out:
 823         return ERR_PTR(err);
 824 }
 825 #endif /* IS_ENABLED(CONFIG_IPV6) */
 826
 827 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 828                         unsigned int opt)
 829 {
 830         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 831         dst_confirm(csk->dst);
 832         smp_mb();
 833         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 834 }
 835 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 836
 837 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 838 {
 839         log_debug(1 << CXGBI_DBG_SOCK,
 840                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 841                 csk, csk->state, csk->flags, csk->user_data);
 842
 843         if (csk->state != CTP_ESTABLISHED) {
 844                 read_lock_bh(&csk->callback_lock);
 845                 if (csk->user_data)
 846                         iscsi_conn_failure(csk->user_data,
 847                                         ISCSI_ERR_TCP_CONN_CLOSE);
 848                 read_unlock_bh(&csk->callback_lock);
 849         }
 850 }
 851
 852 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 853 {
 854         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 855                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 856         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 857         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 858                 return;
 859         if (csk->saddr.sin_port)
 860                 sock_put_port(csk);
 861         if (csk->dst)
 862                 dst_release(csk->dst);
 863         csk->cdev->csk_release_offload_resources(csk);
 864         cxgbi_sock_set_state(csk, CTP_CLOSED);
 865         cxgbi_inform_iscsi_conn_closing(csk);
 866         cxgbi_sock_put(csk);
 867 }
 868 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 869
 870 static void need_active_close(struct cxgbi_sock *csk)
 871 {
 872         int data_lost;
 873         int close_req = 0;
 874
 875         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 876                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 877         spin_lock_bh(&csk->lock);
 878         if (csk->dst)
 879                 dst_confirm(csk->dst);
 880         data_lost = skb_queue_len(&csk->receive_queue);
 881         __skb_queue_purge(&csk->receive_queue);
 882
 883         if (csk->state == CTP_ACTIVE_OPEN)
 884                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 885         else if (csk->state == CTP_ESTABLISHED) {
 886                 close_req = 1;
 887                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 888         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 889                 close_req = 1;
 890                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 891         }
 892
 893         if (close_req) {
 894                 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
 895                     data_lost)
 896                         csk->cdev->csk_send_abort_req(csk);
 897                 else
 898                         csk->cdev->csk_send_close_req(csk);
 899         }
 900
 901         spin_unlock_bh(&csk->lock);
 902 }
 903
 904 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 905 {
 906         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 907                         csk, csk->state, csk->flags,
 908                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 909                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 910                         errno);
 911
 912         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 913         csk->err = errno;
 914         cxgbi_sock_closed(csk);
 915 }
 916 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 917
 918 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 919 {
 920         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 921         struct module *owner = csk->cdev->owner;
 922
 923         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 924                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 925         cxgbi_sock_get(csk);
 926         spin_lock_bh(&csk->lock);
 927         if (csk->state == CTP_ACTIVE_OPEN)
 928                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 929         spin_unlock_bh(&csk->lock);
 930         cxgbi_sock_put(csk);
 931         __kfree_skb(skb);
 932
 933         module_put(owner);
 934 }
 935 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 936
 937 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 938 {
 939         cxgbi_sock_get(csk);
 940         spin_lock_bh(&csk->lock);
 941
 942         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 943         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 944                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 945                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 946                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 947                                csk, csk->state, csk->flags, csk->tid);
 948                 cxgbi_sock_closed(csk);
 949         }
 950
 951         spin_unlock_bh(&csk->lock);
 952         cxgbi_sock_put(csk);
 953 }
 954 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 955
 956 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 957 {
 958         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 959                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 960         cxgbi_sock_get(csk);
 961         spin_lock_bh(&csk->lock);
 962
 963         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 964                 goto done;
 965
 966         switch (csk->state) {
 967         case CTP_ESTABLISHED:
 968                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 969                 break;
 970         case CTP_ACTIVE_CLOSE:
 971                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 972                 break;
 973         case CTP_CLOSE_WAIT_1:
 974                 cxgbi_sock_closed(csk);
 975                 break;
 976         case CTP_ABORTING:
 977                 break;
 978         default:
 979                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 980                         csk, csk->state, csk->flags, csk->tid);
 981         }
 982         cxgbi_inform_iscsi_conn_closing(csk);
 983 done:
 984         spin_unlock_bh(&csk->lock);
 985         cxgbi_sock_put(csk);
 986 }
 987 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 988
 989 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 990 {
 991         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 992                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 993         cxgbi_sock_get(csk);
 994         spin_lock_bh(&csk->lock);
 995
 996         csk->snd_una = snd_nxt - 1;
 997         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 998                 goto done;
 999
1000         switch (csk->state) {
1001         case CTP_ACTIVE_CLOSE:
1002                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1003                 break;
1004         case CTP_CLOSE_WAIT_1:
1005         case CTP_CLOSE_WAIT_2:
1006                 cxgbi_sock_closed(csk);
1007                 break;
1008         case CTP_ABORTING:
1009                 break;
1010         default:
1011                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1012                         csk, csk->state, csk->flags, csk->tid);
1013         }
1014 done:
1015         spin_unlock_bh(&csk->lock);
1016         cxgbi_sock_put(csk);
1017 }
1018 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1019
1020 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1021                            unsigned int snd_una, int seq_chk)
1022 {
1023         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1024                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1025                         csk, csk->state, csk->flags, csk->tid, credits,
1026                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1027
1028         spin_lock_bh(&csk->lock);
1029
1030         csk->wr_cred += credits;
1031         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1032                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1033
1034         while (credits) {
1035                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1036
1037                 if (unlikely(!p)) {
1038                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1039                                 csk, csk->state, csk->flags, csk->tid, credits,
1040                                 csk->wr_cred, csk->wr_una_cred);
1041                         break;
1042                 }
1043
1044                 if (unlikely(credits < p->csum)) {
1045                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1046                                 csk, csk->state, csk->flags, csk->tid,
1047                                 credits, csk->wr_cred, csk->wr_una_cred,
1048                                 p->csum);
1049                         p->csum -= credits;
1050                         break;
1051                 } else {
1052                         cxgbi_sock_dequeue_wr(csk);
1053                         credits -= p->csum;
1054                         kfree_skb(p);
1055                 }
1056         }
1057
1058         cxgbi_sock_check_wr_invariants(csk);
1059
1060         if (seq_chk) {
1061                 if (unlikely(before(snd_una, csk->snd_una))) {
1062                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1063                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1064                                 csk->snd_una);
1065                         goto done;
1066                 }
1067
1068                 if (csk->snd_una != snd_una) {
1069                         csk->snd_una = snd_una;
1070                         dst_confirm(csk->dst);
1071                 }
1072         }
1073
1074         if (skb_queue_len(&csk->write_queue)) {
1075                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1076                         cxgbi_conn_tx_open(csk);
1077         } else
1078                 cxgbi_conn_tx_open(csk);
1079 done:
1080         spin_unlock_bh(&csk->lock);
1081 }
1082 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1083
1084 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1085                                              unsigned short mtu)
1086 {
1087         int i = 0;
1088
1089         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1090                 ++i;
1091
1092         return i;
1093 }
1094
1095 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1096 {
1097         unsigned int idx;
1098         struct dst_entry *dst = csk->dst;
1099
1100         csk->advmss = dst_metric_advmss(dst);
1101
1102         if (csk->advmss > pmtu - 40)
1103                 csk->advmss = pmtu - 40;
1104         if (csk->advmss < csk->cdev->mtus[0] - 40)
1105                 csk->advmss = csk->cdev->mtus[0] - 40;
1106         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1107
1108         return idx;
1109 }
1110 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1111
1112 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1113 {
1114         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1115         __skb_queue_tail(&csk->write_queue, skb);
1116 }
1117 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1118
1119 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1120 {
1121         struct sk_buff *skb;
1122
1123         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1124                 kfree_skb(skb);
1125 }
1126 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1127
1128 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1129 {
1130         int pending = cxgbi_sock_count_pending_wrs(csk);
1131
1132         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1133                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1134                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1135 }
1136 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1137
1138 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1139 {
1140         struct cxgbi_device *cdev = csk->cdev;
1141         struct sk_buff *next;
1142         int err, copied = 0;
1143
1144         spin_lock_bh(&csk->lock);
1145
1146         if (csk->state != CTP_ESTABLISHED) {
1147                 log_debug(1 << CXGBI_DBG_PDU_TX,
1148                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1149                         csk, csk->state, csk->flags, csk->tid);
1150                 err = -EAGAIN;
1151                 goto out_err;
1152         }
1153
1154         if (csk->err) {
1155                 log_debug(1 << CXGBI_DBG_PDU_TX,
1156                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1157                         csk, csk->state, csk->flags, csk->tid, csk->err);
1158                 err = -EPIPE;
1159                 goto out_err;
1160         }
1161
1162         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1163                 log_debug(1 << CXGBI_DBG_PDU_TX,
1164                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1165                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1166                         csk->snd_una, csk->snd_win);
1167                 err = -ENOBUFS;
1168                 goto out_err;
1169         }
1170
1171         while (skb) {
1172                 int frags = skb_shinfo(skb)->nr_frags +
1173                                 (skb->len != skb->data_len);
1174
1175                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1176                         pr_err("csk 0x%p, skb head %u < %u.\n",
1177                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1178                         err = -EINVAL;
1179                         goto out_err;
1180                 }
1181
1182                 if (frags >= SKB_WR_LIST_SIZE) {
1183                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1184                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1185                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1186                         err = -EINVAL;
1187                         goto out_err;
1188                 }
1189
1190                 next = skb->next;
1191                 skb->next = NULL;
1192                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1193                 cxgbi_sock_skb_entail(csk, skb);
1194                 copied += skb->len;
1195                 csk->write_seq += skb->len +
1196                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1197                 skb = next;
1198         }
1199
1200         if (likely(skb_queue_len(&csk->write_queue)))
1201                 cdev->csk_push_tx_frames(csk, 1);
1202 done:
1203         spin_unlock_bh(&csk->lock);
1204         return copied;
1205
1206 out_err:
1207         if (copied == 0 && err == -EPIPE)
1208                 copied = csk->err ? csk->err : -EPIPE;
1209         else
1210                 copied = err;
1211         goto done;
1212 }
1213
1214 static inline void
1215 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1216                 unsigned int *sgcnt, unsigned int *dlen,
1217                 unsigned int prot)
1218 {
1219         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
1220
1221         *sgl = sdb->table.sgl;
1222         *sgcnt = sdb->table.nents;
1223         *dlen = sdb->length;
1224         /* Caution: for protection sdb, sdb->length is invalid */
1225 }
1226
1227 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1228                             struct cxgbi_task_tag_info *ttinfo,
1229                             struct scatterlist **sg_pp, unsigned int *sg_off)
1230 {
1231         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1232         unsigned int offset = sg_off ? *sg_off : 0;
1233         dma_addr_t addr = 0UL;
1234         unsigned int len = 0;
1235         int i;
1236
1237         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1238
1239         if (sg) {
1240                 addr = sg_dma_address(sg);
1241                 len = sg_dma_len(sg);
1242         }
1243
1244         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1245                 if (sg) {
1246                         ppod->addr[i] = cpu_to_be64(addr + offset);
1247                         offset += PAGE_SIZE;
1248                         if (offset == (len + sg->offset)) {
1249                                 offset = 0;
1250                                 sg = sg_next(sg);
1251                                 if (sg) {
1252                                         addr = sg_dma_address(sg);
1253                                         len = sg_dma_len(sg);
1254                                 }
1255                         }
1256                 } else {
1257                         ppod->addr[i] = 0ULL;
1258                 }
1259         }
1260
1261         /*
1262          * the fifth address needs to be repeated in the next ppod, so do
1263          * not move sg
1264          */
1265         if (sg_pp) {
1266                 *sg_pp = sg;
1267                 *sg_off = offset;
1268         }
1269
1270         if (offset == len) {
1271                 offset = 0;
1272                 sg = sg_next(sg);
1273                 if (sg) {
1274                         addr = sg_dma_address(sg);
1275                         len = sg_dma_len(sg);
1276                 }
1277         }
1278         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1279 }
1280 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1281
1282 /*
1283  * APIs interacting with open-iscsi libraries
1284  */
1285
1286 static unsigned char padding[4];
1287
1288 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1289                          struct cxgbi_tag_format *tformat, unsigned int ppmax,
1290                          unsigned int llimit, unsigned int start,
1291                          unsigned int rsvd_factor)
1292 {
1293         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1294                                 cdev->lldev, tformat, ppmax, llimit, start,
1295                                 rsvd_factor);
1296
1297         if (err >= 0) {
1298                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1299
1300                 if (ppm->ppmax < 1024 ||
1301                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1302                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1303                 err = 0;
1304         } else {
1305                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1306         }
1307 }
1308 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1309
1310 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1311 {
1312         int i;
1313         int last_sgidx = nents - 1;
1314         struct scatterlist *sg = sgl;
1315
1316         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1317                 unsigned int len = sg->length + sg->offset;
1318
1319                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1320                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1321                         log_debug(1 << CXGBI_DBG_DDP,
1322                                   "sg %u/%u, %u,%u, not aligned.\n",
1323                                   i, nents, sg->offset, sg->length);
1324                         goto err_out;
1325                 }
1326         }
1327         return 0;
1328 err_out:
1329         return -EINVAL;
1330 }
1331
1332 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1333                              struct cxgbi_task_data *tdata, u32 sw_tag,
1334                              unsigned int xferlen)
1335 {
1336         struct cxgbi_sock *csk = cconn->cep->csk;
1337         struct cxgbi_device *cdev = csk->cdev;
1338         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1339         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1340         struct scatterlist *sgl = ttinfo->sgl;
1341         unsigned int sgcnt = ttinfo->nents;
1342         unsigned int sg_offset = sgl->offset;
1343         int err;
1344
1345         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1346                 log_debug(1 << CXGBI_DBG_DDP,
1347                           "cdev 0x%p DDP off.\n", cdev);
1348                 return -EINVAL;
1349         }
1350
1351         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1352             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1353                 log_debug(1 << CXGBI_DBG_DDP,
1354                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1355                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1356                           xferlen, ttinfo->nents);
1357                 return -EINVAL;
1358         }
1359
1360         /* make sure the buffer is suitable for ddp */
1361         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1362                 return -EINVAL;
1363
1364         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1365                             PAGE_SHIFT;
1366
1367         /*
1368          * the ddp tag will be used for the itt in the outgoing pdu,
1369          * the itt genrated by libiscsi is saved in the ppm and can be
1370          * retrieved via the ddp tag
1371          */
1372         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1373                                       &ttinfo->tag, (unsigned long)sw_tag);
1374         if (err < 0) {
1375                 cconn->ddp_full++;
1376                 return err;
1377         }
1378         ttinfo->npods = err;
1379
1380          /* setup dma from scsi command sgl */
1381         sgl->offset = 0;
1382         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1383         sgl->offset = sg_offset;
1384         if (err == 0) {
1385                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1386                         __func__, sw_tag, xferlen, sgcnt);
1387                 goto rel_ppods;
1388         }
1389         if (err != ttinfo->nr_pages) {
1390                 log_debug(1 << CXGBI_DBG_DDP,
1391                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1392                           __func__, sw_tag, xferlen, sgcnt, err);
1393         }
1394
1395         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1396         ttinfo->cid = csk->port_id;
1397
1398         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1399                                 xferlen, &ttinfo->hdr);
1400
1401         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1402                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1403                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1404         } else {
1405                 /* write ppod from control queue now */
1406                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1407                 if (err < 0)
1408                         goto rel_ppods;
1409         }
1410
1411         return 0;
1412
1413 rel_ppods:
1414         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1415
1416         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1417                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1418                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1419         }
1420         return -EINVAL;
1421 }
1422
1423 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1424 {
1425         struct scsi_cmnd *sc = task->sc;
1426         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1427         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1428         struct cxgbi_device *cdev = cconn->chba->cdev;
1429         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1430         u32 tag = ntohl((__force u32)hdr_itt);
1431
1432         log_debug(1 << CXGBI_DBG_DDP,
1433                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1434                   cdev, task, tag);
1435         if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
1436             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1437                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1438                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1439
1440                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1441                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1442                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1443                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1444                              DMA_FROM_DEVICE);
1445         }
1446 }
1447
1448 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1449 {
1450         /* assume idx and age both are < 0x7FFF (32767) */
1451         return (idx << 16) | age;
1452 }
1453
1454 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1455 {
1456         struct scsi_cmnd *sc = task->sc;
1457         struct iscsi_conn *conn = task->conn;
1458         struct iscsi_session *sess = conn->session;
1459         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1460         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1461         struct cxgbi_device *cdev = cconn->chba->cdev;
1462         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1463         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1464         u32 tag = 0;
1465         int err = -EINVAL;
1466
1467         if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
1468                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1469                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1470
1471                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1472                                 &tdata->dlen, 0);
1473                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1474                 if (!err)
1475                         tag = ttinfo->tag;
1476                 else
1477                          log_debug(1 << CXGBI_DBG_DDP,
1478                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1479                                    cconn->cep->csk, task, tdata->dlen,
1480                                    ttinfo->nents);
1481         }
1482
1483         if (err < 0) {
1484                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1485                 if (err < 0)
1486                         return err;
1487         }
1488         /*  the itt need to sent in big-endian order */
1489         *hdr_itt = (__force itt_t)htonl(tag);
1490
1491         log_debug(1 << CXGBI_DBG_DDP,
1492                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1493                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1494         return 0;
1495 }
1496
1497 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1498 {
1499         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1500         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1501         struct cxgbi_device *cdev = cconn->chba->cdev;
1502         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1503         u32 tag = ntohl((__force u32)itt);
1504         u32 sw_bits;
1505
1506         if (ppm) {
1507                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1508                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1509                 else
1510                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1511         } else {
1512                 sw_bits = tag;
1513         }
1514
1515         cxgbi_decode_sw_tag(sw_bits, idx, age);
1516         log_debug(1 << CXGBI_DBG_DDP,
1517                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1518                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1519                   age ? *age : 0xFF);
1520 }
1521 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1522
1523 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1524 {
1525         struct iscsi_conn *conn = csk->user_data;
1526
1527         if (conn) {
1528                 log_debug(1 << CXGBI_DBG_SOCK,
1529                         "csk 0x%p, cid %d.\n", csk, conn->id);
1530                 iscsi_conn_queue_work(conn);
1531         }
1532 }
1533 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1534
1535 /*
1536  * pdu receive, interact with libiscsi_tcp
1537  */
1538 static inline int read_pdu_skb(struct iscsi_conn *conn,
1539                                struct sk_buff *skb,
1540                                unsigned int offset,
1541                                int offloaded)
1542 {
1543         int status = 0;
1544         int bytes_read;
1545
1546         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1547         switch (status) {
1548         case ISCSI_TCP_CONN_ERR:
1549                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1550                           skb, offset, offloaded);
1551                 return -EIO;
1552         case ISCSI_TCP_SUSPENDED:
1553                 log_debug(1 << CXGBI_DBG_PDU_RX,
1554                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1555                         skb, offset, offloaded, bytes_read);
1556                 /* no transfer - just have caller flush queue */
1557                 return bytes_read;
1558         case ISCSI_TCP_SKB_DONE:
1559                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1560                         skb, offset, offloaded);
1561                 /*
1562                  * pdus should always fit in the skb and we should get
1563                  * segment done notifcation.
1564                  */
1565                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1566                 return -EFAULT;
1567         case ISCSI_TCP_SEGMENT_DONE:
1568                 log_debug(1 << CXGBI_DBG_PDU_RX,
1569                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1570                         skb, offset, offloaded, bytes_read);
1571                 return bytes_read;
1572         default:
1573                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1574                         skb, offset, offloaded, status);
1575                 return -EINVAL;
1576         }
1577 }
1578
1579 static int
1580 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1581                  struct sk_buff *skb)
1582 {
1583         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1584         int err;
1585
1586         log_debug(1 << CXGBI_DBG_PDU_RX,
1587                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1588                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1589
1590         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1591                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1592                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1593                 return -EIO;
1594         }
1595
1596         if (conn->hdrdgst_en &&
1597             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1598                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1599                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1600                 return -EIO;
1601         }
1602
1603         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1604             cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1605                 /* If completion flag is set and data is directly
1606                  * placed in to the host memory then update
1607                  * task->exp_datasn to the datasn in completion
1608                  * iSCSI hdr as T6 adapter generates completion only
1609                  * for the last pdu of a sequence.
1610                  */
1611                 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1612                 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1613                 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1614                                                         skb->data)->datasn);
1615                 if (task && task->sc) {
1616                         struct iscsi_tcp_task *tcp_task = task->dd_data;
1617
1618                         tcp_task->exp_datasn = data_sn;
1619                 }
1620         }
1621
1622         err = read_pdu_skb(conn, skb, 0, 0);
1623         if (likely(err >= 0)) {
1624                 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1625                 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1626
1627                 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1628                         cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1629         }
1630
1631         return err;
1632 }
1633
1634 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1635                              struct sk_buff *skb, unsigned int offset)
1636 {
1637         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1638         bool offloaded = 0;
1639         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1640
1641         log_debug(1 << CXGBI_DBG_PDU_RX,
1642                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1643                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1644
1645         if (conn->datadgst_en &&
1646             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1647                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1648                         conn, lskb, cxgbi_skcb_flags(lskb));
1649                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1650                 return -EIO;
1651         }
1652
1653         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1654                 return 0;
1655
1656         /* coalesced, add header digest length */
1657         if (lskb == skb && conn->hdrdgst_en)
1658                 offset += ISCSI_DIGEST_SIZE;
1659
1660         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1661                 offloaded = 1;
1662
1663         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1664                 log_debug(1 << CXGBI_DBG_PDU_RX,
1665                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1666                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1667                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1668
1669         return read_pdu_skb(conn, skb, offset, offloaded);
1670 }
1671
1672 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1673 {
1674         struct cxgbi_device *cdev = csk->cdev;
1675         int must_send;
1676         u32 credits;
1677
1678         log_debug(1 << CXGBI_DBG_PDU_RX,
1679                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1680                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1681                 csk->rcv_wup, cdev->rx_credit_thres,
1682                 csk->rcv_win);
1683
1684         if (!cdev->rx_credit_thres)
1685                 return;
1686
1687         if (csk->state != CTP_ESTABLISHED)
1688                 return;
1689
1690         credits = csk->copied_seq - csk->rcv_wup;
1691         if (unlikely(!credits))
1692                 return;
1693         must_send = credits + 16384 >= csk->rcv_win;
1694         if (must_send || credits >= cdev->rx_credit_thres)
1695                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1696 }
1697
1698 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1699 {
1700         struct cxgbi_device *cdev = csk->cdev;
1701         struct iscsi_conn *conn = csk->user_data;
1702         struct sk_buff *skb;
1703         unsigned int read = 0;
1704         int err = 0;
1705
1706         log_debug(1 << CXGBI_DBG_PDU_RX,
1707                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1708
1709         if (unlikely(!conn || conn->suspend_rx)) {
1710                 log_debug(1 << CXGBI_DBG_PDU_RX,
1711                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1712                         csk, conn, conn ? conn->id : 0xFF,
1713                         conn ? conn->suspend_rx : 0xFF);
1714                 return;
1715         }
1716
1717         while (!err) {
1718                 skb = skb_peek(&csk->receive_queue);
1719                 if (!skb ||
1720                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1721                         if (skb)
1722                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1723                                         "skb 0x%p, NOT ready 0x%lx.\n",
1724                                         skb, cxgbi_skcb_flags(skb));
1725                         break;
1726                 }
1727                 __skb_unlink(skb, &csk->receive_queue);
1728
1729                 read += cxgbi_skcb_rx_pdulen(skb);
1730                 log_debug(1 << CXGBI_DBG_PDU_RX,
1731                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1732                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1733                         cxgbi_skcb_rx_pdulen(skb));
1734
1735                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1736                         err = skb_read_pdu_bhs(csk, conn, skb);
1737                         if (err < 0) {
1738                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1739                                         "f 0x%lx, plen %u.\n",
1740                                         csk, skb, skb->len,
1741                                         cxgbi_skcb_flags(skb),
1742                                         cxgbi_skcb_rx_pdulen(skb));
1743                                 goto skb_done;
1744                         }
1745                         err = skb_read_pdu_data(conn, skb, skb,
1746                                                 err + cdev->skb_rx_extra);
1747                         if (err < 0)
1748                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1749                                         "f 0x%lx, plen %u.\n",
1750                                         csk, skb, skb->len,
1751                                         cxgbi_skcb_flags(skb),
1752                                         cxgbi_skcb_rx_pdulen(skb));
1753                 } else {
1754                         err = skb_read_pdu_bhs(csk, conn, skb);
1755                         if (err < 0) {
1756                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1757                                         "f 0x%lx, plen %u.\n",
1758                                         csk, skb, skb->len,
1759                                         cxgbi_skcb_flags(skb),
1760                                         cxgbi_skcb_rx_pdulen(skb));
1761                                 goto skb_done;
1762                         }
1763
1764                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1765                                 struct sk_buff *dskb;
1766
1767                                 dskb = skb_peek(&csk->receive_queue);
1768                                 if (!dskb) {
1769                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1770                                                 " plen %u, NO data.\n",
1771                                                 csk, skb, skb->len,
1772                                                 cxgbi_skcb_flags(skb),
1773                                                 cxgbi_skcb_rx_pdulen(skb));
1774                                         err = -EIO;
1775                                         goto skb_done;
1776                                 }
1777                                 __skb_unlink(dskb, &csk->receive_queue);
1778
1779                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1780                                 if (err < 0)
1781                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1782                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1783                                                 "%u.\n",
1784                                                 csk, skb, skb->len,
1785                                                 cxgbi_skcb_flags(skb),
1786                                                 cxgbi_skcb_rx_pdulen(skb),
1787                                                 dskb, dskb->len);
1788                                 __kfree_skb(dskb);
1789                         } else
1790                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1791                 }
1792 skb_done:
1793                 __kfree_skb(skb);
1794
1795                 if (err < 0)
1796                         break;
1797         }
1798
1799         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1800         if (read) {
1801                 csk->copied_seq += read;
1802                 csk_return_rx_credits(csk, read);
1803                 conn->rxdata_octets += read;
1804         }
1805
1806         if (err < 0) {
1807                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1808                         csk, conn, err, read);
1809                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1810         }
1811 }
1812 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1813
1814 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1815                                 unsigned int offset, unsigned int *off,
1816                                 struct scatterlist **sgp)
1817 {
1818         int i;
1819         struct scatterlist *sg;
1820
1821         for_each_sg(sgl, sg, sgcnt, i) {
1822                 if (offset < sg->length) {
1823                         *off = offset;
1824                         *sgp = sg;
1825                         return 0;
1826                 }
1827                 offset -= sg->length;
1828         }
1829         return -EFAULT;
1830 }
1831
1832 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1833                                 unsigned int dlen, struct page_frag *frags,
1834                                 int frag_max)
1835 {
1836         unsigned int datalen = dlen;
1837         unsigned int sglen = sg->length - sgoffset;
1838         struct page *page = sg_page(sg);
1839         int i;
1840
1841         i = 0;
1842         do {
1843                 unsigned int copy;
1844
1845                 if (!sglen) {
1846                         sg = sg_next(sg);
1847                         if (!sg) {
1848                                 pr_warn("sg %d NULL, len %u/%u.\n",
1849                                         i, datalen, dlen);
1850                                 return -EINVAL;
1851                         }
1852                         sgoffset = 0;
1853                         sglen = sg->length;
1854                         page = sg_page(sg);
1855
1856                 }
1857                 copy = min(datalen, sglen);
1858                 if (i && page == frags[i - 1].page &&
1859                     sgoffset + sg->offset ==
1860                         frags[i - 1].offset + frags[i - 1].size) {
1861                         frags[i - 1].size += copy;
1862                 } else {
1863                         if (i >= frag_max) {
1864                                 pr_warn("too many pages %u, dlen %u.\n",
1865                                         frag_max, dlen);
1866                                 return -EINVAL;
1867                         }
1868
1869                         frags[i].page = page;
1870                         frags[i].offset = sg->offset + sgoffset;
1871                         frags[i].size = copy;
1872                         i++;
1873                 }
1874                 datalen -= copy;
1875                 sgoffset += copy;
1876                 sglen -= copy;
1877         } while (datalen);
1878
1879         return i;
1880 }
1881
1882 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1883 {
1884         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1885         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1886         struct cxgbi_device *cdev = cconn->chba->cdev;
1887         struct iscsi_conn *conn = task->conn;
1888         struct iscsi_tcp_task *tcp_task = task->dd_data;
1889         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1890         struct scsi_cmnd *sc = task->sc;
1891         struct cxgbi_sock *csk = cconn->cep->csk;
1892         struct net_device *ndev = cdev->ports[csk->port_id];
1893         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1894
1895         tcp_task->dd_data = tdata;
1896         task->hdr = NULL;
1897
1898         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1899             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1900              (opcode == ISCSI_OP_SCSI_CMD &&
1901               sc->sc_data_direction == DMA_TO_DEVICE)))
1902                 /* data could goes into skb head */
1903                 headroom += min_t(unsigned int,
1904                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1905                                 conn->max_xmit_dlength);
1906
1907         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1908         if (!tdata->skb) {
1909                 ndev->stats.tx_dropped++;
1910                 return -ENOMEM;
1911         }
1912
1913         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1914
1915         if (task->sc) {
1916                 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1917         } else {
1918                 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1919                 if (!task->hdr) {
1920                         __kfree_skb(tdata->skb);
1921                         tdata->skb = NULL;
1922                         ndev->stats.tx_dropped++;
1923                         return -ENOMEM;
1924                 }
1925         }
1926         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1927
1928         /* data_out uses scsi_cmd's itt */
1929         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1930                 task_reserve_itt(task, &task->hdr->itt);
1931
1932         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1933                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1934                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1935                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1936
1937         return 0;
1938 }
1939 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1940
1941 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1942 {
1943         if (hcrc || dcrc) {
1944                 u8 submode = 0;
1945
1946                 if (hcrc)
1947                         submode |= 1;
1948                 if (dcrc)
1949                         submode |= 2;
1950                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1951         } else
1952                 cxgbi_skcb_ulp_mode(skb) = 0;
1953 }
1954
1955 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1956                               unsigned int count)
1957 {
1958         struct iscsi_conn *conn = task->conn;
1959         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1960         struct sk_buff *skb = tdata->skb;
1961         unsigned int datalen = count;
1962         int i, padlen = iscsi_padding(count);
1963         struct page *pg;
1964
1965         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1966                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1967                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1968                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1969
1970         skb_put(skb, task->hdr_len);
1971         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1972         if (!count)
1973                 return 0;
1974
1975         if (task->sc) {
1976                 struct scsi_data_buffer *sdb = &task->sc->sdb;
1977                 struct scatterlist *sg = NULL;
1978                 int err;
1979
1980                 tdata->offset = offset;
1981                 tdata->count = count;
1982                 err = sgl_seek_offset(
1983                                         sdb->table.sgl, sdb->table.nents,
1984                                         tdata->offset, &tdata->sgoffset, &sg);
1985                 if (err < 0) {
1986                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1987                                 sdb->table.nents, tdata->offset, sdb->length);
1988                         return err;
1989                 }
1990                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1991                                         tdata->frags, MAX_PDU_FRAGS);
1992                 if (err < 0) {
1993                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1994                                 sdb->table.nents, tdata->offset, tdata->count);
1995                         return err;
1996                 }
1997                 tdata->nr_frags = err;
1998
1999                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2000                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2001                         char *dst = skb->data + task->hdr_len;
2002                         struct page_frag *frag = tdata->frags;
2003
2004                         /* data fits in the skb's headroom */
2005                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2006                                 char *src = kmap_atomic(frag->page);
2007
2008                                 memcpy(dst, src+frag->offset, frag->size);
2009                                 dst += frag->size;
2010                                 kunmap_atomic(src);
2011                         }
2012                         if (padlen) {
2013                                 memset(dst, 0, padlen);
2014                                 padlen = 0;
2015                         }
2016                         skb_put(skb, count + padlen);
2017                 } else {
2018                         /* data fit into frag_list */
2019                         for (i = 0; i < tdata->nr_frags; i++) {
2020                                 __skb_fill_page_desc(skb, i,
2021                                                 tdata->frags[i].page,
2022                                                 tdata->frags[i].offset,
2023                                                 tdata->frags[i].size);
2024                                 skb_frag_ref(skb, i);
2025                         }
2026                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2027                         skb->len += count;
2028                         skb->data_len += count;
2029                         skb->truesize += count;
2030                 }
2031
2032         } else {
2033                 pg = virt_to_page(task->data);
2034
2035                 get_page(pg);
2036                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2037                                         count);
2038                 skb->len += count;
2039                 skb->data_len += count;
2040                 skb->truesize += count;
2041         }
2042
2043         if (padlen) {
2044                 i = skb_shinfo(skb)->nr_frags;
2045                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2046                                 virt_to_page(padding), offset_in_page(padding),
2047                                 padlen);
2048
2049                 skb->data_len += padlen;
2050                 skb->truesize += padlen;
2051                 skb->len += padlen;
2052         }
2053
2054         return 0;
2055 }
2056 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2057
2058 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2059 {
2060         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2061         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2062         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2063         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2064         struct sk_buff *skb = tdata->skb;
2065         struct cxgbi_sock *csk = NULL;
2066         unsigned int datalen;
2067         int err;
2068
2069         if (!skb) {
2070                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2071                         "task 0x%p\n", task);
2072                 return 0;
2073         }
2074
2075         if (cconn && cconn->cep)
2076                 csk = cconn->cep->csk;
2077         if (!csk) {
2078                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2079                           "task 0x%p, csk gone.\n", task);
2080                 return -EPIPE;
2081         }
2082
2083         tdata->skb = NULL;
2084         datalen = skb->data_len;
2085
2086         /* write ppod first if using ofldq to write ppod */
2087         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2088                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2089
2090                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2091                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2092                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2093                                task);
2094                         /* continue. Let fl get the data */
2095         }
2096
2097         if (!task->sc)
2098                 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2099
2100         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2101         if (err > 0) {
2102                 int pdulen = err;
2103
2104                 log_debug(1 << CXGBI_DBG_PDU_TX,
2105                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2106                         task, task->sc, skb, skb->len, skb->data_len, err);
2107
2108                 if (task->conn->hdrdgst_en)
2109                         pdulen += ISCSI_DIGEST_SIZE;
2110
2111                 if (datalen && task->conn->datadgst_en)
2112                         pdulen += ISCSI_DIGEST_SIZE;
2113
2114                 task->conn->txdata_octets += pdulen;
2115                 return 0;
2116         }
2117
2118         if (err == -EAGAIN || err == -ENOBUFS) {
2119                 log_debug(1 << CXGBI_DBG_PDU_TX,
2120                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2121                         task, skb, skb->len, skb->data_len, err);
2122                 /* reset skb to send when we are called again */
2123                 tdata->skb = skb;
2124                 return err;
2125         }
2126
2127         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2128                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2129                 task->itt, skb, skb->len, skb->data_len, err);
2130
2131         __kfree_skb(skb);
2132
2133         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2134         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2135         return err;
2136 }
2137 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2138
2139 void cxgbi_cleanup_task(struct iscsi_task *task)
2140 {
2141         struct iscsi_tcp_task *tcp_task = task->dd_data;
2142         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2143
2144         if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2145                 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2146                         task, task->sc, tcp_task,
2147                         tcp_task ? tcp_task->dd_data : NULL, tdata);
2148                 return;
2149         }
2150
2151         log_debug(1 << CXGBI_DBG_ISCSI,
2152                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2153                 task, tdata->skb, task->hdr_itt);
2154
2155         tcp_task->dd_data = NULL;
2156
2157         if (!task->sc)
2158                 kfree(task->hdr);
2159         task->hdr = NULL;
2160
2161         /*  never reached the xmit task callout */
2162         if (tdata->skb) {
2163                 __kfree_skb(tdata->skb);
2164                 tdata->skb = NULL;
2165         }
2166
2167         task_release_itt(task, task->hdr_itt);
2168         memset(tdata, 0, sizeof(*tdata));
2169
2170         iscsi_tcp_cleanup_task(task);
2171 }
2172 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2173
2174 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2175                                 struct iscsi_stats *stats)
2176 {
2177         struct iscsi_conn *conn = cls_conn->dd_data;
2178
2179         stats->txdata_octets = conn->txdata_octets;
2180         stats->rxdata_octets = conn->rxdata_octets;
2181         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2182         stats->dataout_pdus = conn->dataout_pdus_cnt;
2183         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2184         stats->datain_pdus = conn->datain_pdus_cnt;
2185         stats->r2t_pdus = conn->r2t_pdus_cnt;
2186         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2187         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2188         stats->digest_err = 0;
2189         stats->timeout_err = 0;
2190         stats->custom_length = 1;
2191         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2192         stats->custom[0].value = conn->eh_abort_cnt;
2193 }
2194 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2195
2196 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2197 {
2198         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2199         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2200         struct cxgbi_device *cdev = cconn->chba->cdev;
2201         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2202         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2203         unsigned int max = max(max_def, headroom);
2204
2205         max = min(cconn->chba->cdev->tx_max_size, max);
2206         if (conn->max_xmit_dlength)
2207                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2208         else
2209                 conn->max_xmit_dlength = max;
2210         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2211
2212         return 0;
2213 }
2214
2215 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2216 {
2217         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2218         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2219         unsigned int max = cconn->chba->cdev->rx_max_size;
2220
2221         cxgbi_align_pdu_size(max);
2222
2223         if (conn->max_recv_dlength) {
2224                 if (conn->max_recv_dlength > max) {
2225                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2226                                 conn->max_recv_dlength, max);
2227                         return -EINVAL;
2228                 }
2229                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2230                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2231         } else
2232                 conn->max_recv_dlength = max;
2233
2234         return 0;
2235 }
2236
2237 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2238                         enum iscsi_param param, char *buf, int buflen)
2239 {
2240         struct iscsi_conn *conn = cls_conn->dd_data;
2241         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2242         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2243         struct cxgbi_sock *csk = cconn->cep->csk;
2244         int err;
2245
2246         log_debug(1 << CXGBI_DBG_ISCSI,
2247                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2248                 cls_conn, param, buflen, buf);
2249
2250         switch (param) {
2251         case ISCSI_PARAM_HDRDGST_EN:
2252                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2253                 if (!err && conn->hdrdgst_en)
2254                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2255                                                         conn->hdrdgst_en,
2256                                                         conn->datadgst_en);
2257                 break;
2258         case ISCSI_PARAM_DATADGST_EN:
2259                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2260                 if (!err && conn->datadgst_en)
2261                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2262                                                         conn->hdrdgst_en,
2263                                                         conn->datadgst_en);
2264                 break;
2265         case ISCSI_PARAM_MAX_R2T:
2266                 return iscsi_tcp_set_max_r2t(conn, buf);
2267         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2268                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2269                 if (!err)
2270                         err = cxgbi_conn_max_recv_dlength(conn);
2271                 break;
2272         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2273                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2274                 if (!err)
2275                         err = cxgbi_conn_max_xmit_dlength(conn);
2276                 break;
2277         default:
2278                 return iscsi_set_param(cls_conn, param, buf, buflen);
2279         }
2280         return err;
2281 }
2282 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2283
2284 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2285 {
2286         int len;
2287
2288         cxgbi_sock_get(csk);
2289         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2290         cxgbi_sock_put(csk);
2291
2292         return len;
2293 }
2294
2295 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2296 {
2297         int len;
2298
2299         cxgbi_sock_get(csk);
2300         if (csk->csk_family == AF_INET)
2301                 len = sprintf(buf, "%pI4",
2302                               &csk->daddr.sin_addr.s_addr);
2303         else
2304                 len = sprintf(buf, "%pI6",
2305                               &csk->daddr6.sin6_addr);
2306
2307         cxgbi_sock_put(csk);
2308
2309         return len;
2310 }
2311
2312 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2313                        char *buf)
2314 {
2315         struct cxgbi_endpoint *cep = ep->dd_data;
2316         struct cxgbi_sock *csk;
2317
2318         log_debug(1 << CXGBI_DBG_ISCSI,
2319                 "cls_conn 0x%p, param %d.\n", ep, param);
2320
2321         switch (param) {
2322         case ISCSI_PARAM_CONN_PORT:
2323         case ISCSI_PARAM_CONN_ADDRESS:
2324                 if (!cep)
2325                         return -ENOTCONN;
2326
2327                 csk = cep->csk;
2328                 if (!csk)
2329                         return -ENOTCONN;
2330
2331                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2332                                                  &csk->daddr, param, buf);
2333         default:
2334                 break;
2335         }
2336         return -ENOSYS;
2337 }
2338 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2339
2340 struct iscsi_cls_conn *
2341 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2342 {
2343         struct iscsi_cls_conn *cls_conn;
2344         struct iscsi_conn *conn;
2345         struct iscsi_tcp_conn *tcp_conn;
2346         struct cxgbi_conn *cconn;
2347
2348         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2349         if (!cls_conn)
2350                 return NULL;
2351
2352         conn = cls_conn->dd_data;
2353         tcp_conn = conn->dd_data;
2354         cconn = tcp_conn->dd_data;
2355         cconn->iconn = conn;
2356
2357         log_debug(1 << CXGBI_DBG_ISCSI,
2358                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2359                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2360
2361         return cls_conn;
2362 }
2363 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2364
2365 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2366                                 struct iscsi_cls_conn *cls_conn,
2367                                 u64 transport_eph, int is_leading)
2368 {
2369         struct iscsi_conn *conn = cls_conn->dd_data;
2370         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2371         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2372         struct cxgbi_ppm *ppm;
2373         struct iscsi_endpoint *ep;
2374         struct cxgbi_endpoint *cep;
2375         struct cxgbi_sock *csk;
2376         int err;
2377
2378         ep = iscsi_lookup_endpoint(transport_eph);
2379         if (!ep)
2380                 return -EINVAL;
2381
2382         /*  setup ddp pagesize */
2383         cep = ep->dd_data;
2384         csk = cep->csk;
2385
2386         ppm = csk->cdev->cdev2ppm(csk->cdev);
2387         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2388                                              ppm->tformat.pgsz_idx_dflt);
2389         if (err < 0)
2390                 return err;
2391
2392         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2393         if (err)
2394                 return -EINVAL;
2395
2396         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2397         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2398
2399         write_lock_bh(&csk->callback_lock);
2400         csk->user_data = conn;
2401         cconn->chba = cep->chba;
2402         cconn->cep = cep;
2403         cep->cconn = cconn;
2404         write_unlock_bh(&csk->callback_lock);
2405
2406         cxgbi_conn_max_xmit_dlength(conn);
2407         cxgbi_conn_max_recv_dlength(conn);
2408
2409         log_debug(1 << CXGBI_DBG_ISCSI,
2410                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2411                 cls_session, cls_conn, ep, cconn, csk);
2412         /*  init recv engine */
2413         iscsi_tcp_hdr_recv_prep(tcp_conn);
2414
2415         return 0;
2416 }
2417 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2418
2419 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2420                                                 u16 cmds_max, u16 qdepth,
2421                                                 u32 initial_cmdsn)
2422 {
2423         struct cxgbi_endpoint *cep;
2424         struct cxgbi_hba *chba;
2425         struct Scsi_Host *shost;
2426         struct iscsi_cls_session *cls_session;
2427         struct iscsi_session *session;
2428
2429         if (!ep) {
2430                 pr_err("missing endpoint.\n");
2431                 return NULL;
2432         }
2433
2434         cep = ep->dd_data;
2435         chba = cep->chba;
2436         shost = chba->shost;
2437
2438         BUG_ON(chba != iscsi_host_priv(shost));
2439
2440         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2441                                         cmds_max, 0,
2442                                         sizeof(struct iscsi_tcp_task) +
2443                                         sizeof(struct cxgbi_task_data),
2444                                         initial_cmdsn, ISCSI_MAX_TARGET);
2445         if (!cls_session)
2446                 return NULL;
2447
2448         session = cls_session->dd_data;
2449         if (iscsi_tcp_r2tpool_alloc(session))
2450                 goto remove_session;
2451
2452         log_debug(1 << CXGBI_DBG_ISCSI,
2453                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2454         return cls_session;
2455
2456 remove_session:
2457         iscsi_session_teardown(cls_session);
2458         return NULL;
2459 }
2460 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2461
2462 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2463 {
2464         log_debug(1 << CXGBI_DBG_ISCSI,
2465                 "cls sess 0x%p.\n", cls_session);
2466
2467         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2468         iscsi_session_teardown(cls_session);
2469 }
2470 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2471
2472 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2473                         char *buf, int buflen)
2474 {
2475         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2476
2477         if (!chba->ndev) {
2478                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2479                                 "netdev for host not set.\n");
2480                 return -ENODEV;
2481         }
2482
2483         log_debug(1 << CXGBI_DBG_ISCSI,
2484                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2485                 shost, chba, chba->ndev->name, param, buflen, buf);
2486
2487         switch (param) {
2488         case ISCSI_HOST_PARAM_IPADDRESS:
2489         {
2490                 __be32 addr = in_aton(buf);
2491                 log_debug(1 << CXGBI_DBG_ISCSI,
2492                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2493                 cxgbi_set_iscsi_ipv4(chba, addr);
2494                 return 0;
2495         }
2496         case ISCSI_HOST_PARAM_HWADDRESS:
2497         case ISCSI_HOST_PARAM_NETDEV_NAME:
2498                 return 0;
2499         default:
2500                 return iscsi_host_set_param(shost, param, buf, buflen);
2501         }
2502 }
2503 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2504
2505 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2506                         char *buf)
2507 {
2508         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2509         int len = 0;
2510
2511         if (!chba->ndev) {
2512                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2513                                 "netdev for host not set.\n");
2514                 return -ENODEV;
2515         }
2516
2517         log_debug(1 << CXGBI_DBG_ISCSI,
2518                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2519                 shost, chba, chba->ndev->name, param);
2520
2521         switch (param) {
2522         case ISCSI_HOST_PARAM_HWADDRESS:
2523                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2524                 break;
2525         case ISCSI_HOST_PARAM_NETDEV_NAME:
2526                 len = sprintf(buf, "%s\n", chba->ndev->name);
2527                 break;
2528         case ISCSI_HOST_PARAM_IPADDRESS:
2529         {
2530                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2531                                                            chba->port_id);
2532                 if (csk) {
2533                         len = sprintf(buf, "%pIS",
2534                                       (struct sockaddr *)&csk->saddr);
2535                 }
2536                 log_debug(1 << CXGBI_DBG_ISCSI,
2537                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2538                 break;
2539         }
2540         default:
2541                 return iscsi_host_get_param(shost, param, buf);
2542         }
2543
2544         return len;
2545 }
2546 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2547
2548 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2549                                         struct sockaddr *dst_addr,
2550                                         int non_blocking)
2551 {
2552         struct iscsi_endpoint *ep;
2553         struct cxgbi_endpoint *cep;
2554         struct cxgbi_hba *hba = NULL;
2555         struct cxgbi_sock *csk;
2556         int ifindex = 0;
2557         int err = -EINVAL;
2558
2559         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2560                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2561                 shost, non_blocking, dst_addr);
2562
2563         if (shost) {
2564                 hba = iscsi_host_priv(shost);
2565                 if (!hba) {
2566                         pr_info("shost 0x%p, priv NULL.\n", shost);
2567                         goto err_out;
2568                 }
2569         }
2570
2571 check_route:
2572         if (dst_addr->sa_family == AF_INET) {
2573                 csk = cxgbi_check_route(dst_addr, ifindex);
2574 #if IS_ENABLED(CONFIG_IPV6)
2575         } else if (dst_addr->sa_family == AF_INET6) {
2576                 csk = cxgbi_check_route6(dst_addr, ifindex);
2577 #endif
2578         } else {
2579                 pr_info("address family 0x%x NOT supported.\n",
2580                         dst_addr->sa_family);
2581                 err = -EAFNOSUPPORT;
2582                 return (struct iscsi_endpoint *)ERR_PTR(err);
2583         }
2584
2585         if (IS_ERR(csk))
2586                 return (struct iscsi_endpoint *)csk;
2587         cxgbi_sock_get(csk);
2588
2589         if (!hba)
2590                 hba = csk->cdev->hbas[csk->port_id];
2591         else if (hba != csk->cdev->hbas[csk->port_id]) {
2592                 if (ifindex != hba->ndev->ifindex) {
2593                         cxgbi_sock_put(csk);
2594                         cxgbi_sock_closed(csk);
2595                         ifindex = hba->ndev->ifindex;
2596                         goto check_route;
2597                 }
2598
2599                 pr_info("Could not connect through requested host %u"
2600                         "hba 0x%p != 0x%p (%u).\n",
2601                         shost->host_no, hba,
2602                         csk->cdev->hbas[csk->port_id], csk->port_id);
2603                 err = -ENOSPC;
2604                 goto release_conn;
2605         }
2606
2607         err = sock_get_port(csk);
2608         if (err)
2609                 goto release_conn;
2610
2611         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2612         err = csk->cdev->csk_init_act_open(csk);
2613         if (err)
2614                 goto release_conn;
2615
2616         if (cxgbi_sock_is_closing(csk)) {
2617                 err = -ENOSPC;
2618                 pr_info("csk 0x%p is closing.\n", csk);
2619                 goto release_conn;
2620         }
2621
2622         ep = iscsi_create_endpoint(sizeof(*cep));
2623         if (!ep) {
2624                 err = -ENOMEM;
2625                 pr_info("iscsi alloc ep, OOM.\n");
2626                 goto release_conn;
2627         }
2628
2629         cep = ep->dd_data;
2630         cep->csk = csk;
2631         cep->chba = hba;
2632
2633         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2634                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2635                 ep, cep, csk, hba, hba->ndev->name);
2636         return ep;
2637
2638 release_conn:
2639         cxgbi_sock_put(csk);
2640         cxgbi_sock_closed(csk);
2641 err_out:
2642         return ERR_PTR(err);
2643 }
2644 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2645
2646 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2647 {
2648         struct cxgbi_endpoint *cep = ep->dd_data;
2649         struct cxgbi_sock *csk = cep->csk;
2650
2651         if (!cxgbi_sock_is_established(csk))
2652                 return 0;
2653         return 1;
2654 }
2655 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2656
2657 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2658 {
2659         struct cxgbi_endpoint *cep = ep->dd_data;
2660         struct cxgbi_conn *cconn = cep->cconn;
2661         struct cxgbi_sock *csk = cep->csk;
2662
2663         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2664                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2665                 ep, cep, cconn, csk, csk->state, csk->flags);
2666
2667         if (cconn && cconn->iconn) {
2668                 iscsi_suspend_tx(cconn->iconn);
2669                 write_lock_bh(&csk->callback_lock);
2670                 cep->csk->user_data = NULL;
2671                 cconn->cep = NULL;
2672                 write_unlock_bh(&csk->callback_lock);
2673         }
2674         iscsi_destroy_endpoint(ep);
2675
2676         if (likely(csk->state >= CTP_ESTABLISHED))
2677                 need_active_close(csk);
2678         else
2679                 cxgbi_sock_closed(csk);
2680
2681         cxgbi_sock_put(csk);
2682 }
2683 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2684
2685 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2686                         struct scsi_transport_template **stt)
2687 {
2688         *stt = iscsi_register_transport(itp);
2689         if (*stt == NULL) {
2690                 pr_err("unable to register %s transport 0x%p.\n",
2691                         itp->name, itp);
2692                 return -ENODEV;
2693         }
2694         log_debug(1 << CXGBI_DBG_ISCSI,
2695                 "%s, registered iscsi transport 0x%p.\n",
2696                 itp->name, stt);
2697         return 0;
2698 }
2699 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2700
2701 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2702                         struct scsi_transport_template **stt)
2703 {
2704         if (*stt) {
2705                 log_debug(1 << CXGBI_DBG_ISCSI,
2706                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2707                         itp, itp->name, *stt);
2708                 *stt = NULL;
2709                 iscsi_unregister_transport(itp);
2710         }
2711 }
2712 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2713
2714 umode_t cxgbi_attr_is_visible(int param_type, int param)
2715 {
2716         switch (param_type) {
2717         case ISCSI_HOST_PARAM:
2718                 switch (param) {
2719                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2720                 case ISCSI_HOST_PARAM_HWADDRESS:
2721                 case ISCSI_HOST_PARAM_IPADDRESS:
2722                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2723                         return S_IRUGO;
2724                 default:
2725                         return 0;
2726                 }
2727         case ISCSI_PARAM:
2728                 switch (param) {
2729                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2730                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2731                 case ISCSI_PARAM_HDRDGST_EN:
2732                 case ISCSI_PARAM_DATADGST_EN:
2733                 case ISCSI_PARAM_CONN_ADDRESS:
2734                 case ISCSI_PARAM_CONN_PORT:
2735                 case ISCSI_PARAM_EXP_STATSN:
2736                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2737                 case ISCSI_PARAM_PERSISTENT_PORT:
2738                 case ISCSI_PARAM_PING_TMO:
2739                 case ISCSI_PARAM_RECV_TMO:
2740                 case ISCSI_PARAM_INITIAL_R2T_EN:
2741                 case ISCSI_PARAM_MAX_R2T:
2742                 case ISCSI_PARAM_IMM_DATA_EN:
2743                 case ISCSI_PARAM_FIRST_BURST:
2744                 case ISCSI_PARAM_MAX_BURST:
2745                 case ISCSI_PARAM_PDU_INORDER_EN:
2746                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2747                 case ISCSI_PARAM_ERL:
2748                 case ISCSI_PARAM_TARGET_NAME:
2749                 case ISCSI_PARAM_TPGT:
2750                 case ISCSI_PARAM_USERNAME:
2751                 case ISCSI_PARAM_PASSWORD:
2752                 case ISCSI_PARAM_USERNAME_IN:
2753                 case ISCSI_PARAM_PASSWORD_IN:
2754                 case ISCSI_PARAM_FAST_ABORT:
2755                 case ISCSI_PARAM_ABORT_TMO:
2756                 case ISCSI_PARAM_LU_RESET_TMO:
2757                 case ISCSI_PARAM_TGT_RESET_TMO:
2758                 case ISCSI_PARAM_IFACE_NAME:
2759                 case ISCSI_PARAM_INITIATOR_NAME:
2760                         return S_IRUGO;
2761                 default:
2762                         return 0;
2763                 }
2764         }
2765
2766         return 0;
2767 }
2768 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2769
2770 static int __init libcxgbi_init_module(void)
2771 {
2772         pr_info("%s", version);
2773
2774         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2775                      sizeof(struct cxgbi_skb_cb));
2776         return 0;
2777 }
2778
2779 static void __exit libcxgbi_exit_module(void)
2780 {
2781         cxgbi_device_unregister_all(0xFF);
2782         return;
2783 }
2784
2785 module_init(libcxgbi_init_module);
2786 module_exit(libcxgbi_exit_module);