drivers/scsi/bnx2fc/bnx2fc_io.c

   1 /* bnx2fc_io.c: QLogic Linux FCoE offload driver.
   2  * IO manager and SCSI IO processing.
   3  *
   4  * Copyright (c) 2008-2013 Broadcom Corporation
   5  * Copyright (c) 2014-2015 QLogic Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation.
  10  *
  11  * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  12  */
  13
  14 #include "bnx2fc.h"
  15
  16 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  17
  18 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  19                            int bd_index);
  20 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  21 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  22 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  23 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  24 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  25                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
  26                                  u8 num_rq);
  27
  28 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  29                           unsigned int timer_msec)
  30 {
  31         struct bnx2fc_interface *interface = io_req->port->priv;
  32
  33         if (queue_delayed_work(interface->timer_work_queue,
  34                                &io_req->timeout_work,
  35                                msecs_to_jiffies(timer_msec)))
  36                 kref_get(&io_req->refcount);
  37 }
  38
  39 static void bnx2fc_cmd_timeout(struct work_struct *work)
  40 {
  41         struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  42                                                  timeout_work.work);
  43         u8 cmd_type = io_req->cmd_type;
  44         struct bnx2fc_rport *tgt = io_req->tgt;
  45         int rc;
  46
  47         BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  48                       "req_flags = %lx\n", cmd_type, io_req->req_flags);
  49
  50         spin_lock_bh(&tgt->tgt_lock);
  51         if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  52                 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  53                 /*
  54                  * ideally we should hold the io_req until RRQ complets,
  55                  * and release io_req from timeout hold.
  56                  */
  57                 spin_unlock_bh(&tgt->tgt_lock);
  58                 bnx2fc_send_rrq(io_req);
  59                 return;
  60         }
  61         if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  62                 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
  63                 goto done;
  64         }
  65
  66         switch (cmd_type) {
  67         case BNX2FC_SCSI_CMD:
  68                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  69                                                         &io_req->req_flags)) {
  70                         /* Handle eh_abort timeout */
  71                         BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
  72                         complete(&io_req->tm_done);
  73                 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  74                                     &io_req->req_flags)) {
  75                         /* Handle internally generated ABTS timeout */
  76                         BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
  77                                         io_req->refcount.refcount.counter);
  78                         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  79                                                &io_req->req_flags))) {
  80                                 /*
  81                                  * Cleanup and return original command to
  82                                  * mid-layer.
  83                                  */
  84                                 bnx2fc_initiate_cleanup(io_req);
  85                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
  86                                 spin_unlock_bh(&tgt->tgt_lock);
  87
  88                                 return;
  89                         }
  90                 } else {
  91                         /* Hanlde IO timeout */
  92                         BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
  93                         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
  94                                              &io_req->req_flags)) {
  95                                 BNX2FC_IO_DBG(io_req, "IO completed before "
  96                                                            " timer expiry\n");
  97                                 goto done;
  98                         }
  99
 100                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
 101                                               &io_req->req_flags)) {
 102                                 rc = bnx2fc_initiate_abts(io_req);
 103                                 if (rc == SUCCESS)
 104                                         goto done;
 105
 106                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 107                                 spin_unlock_bh(&tgt->tgt_lock);
 108
 109                                 return;
 110                         } else {
 111                                 BNX2FC_IO_DBG(io_req, "IO already in "
 112                                                       "ABTS processing\n");
 113                         }
 114                 }
 115                 break;
 116         case BNX2FC_ELS:
 117
 118                 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
 119                         BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
 120
 121                         if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
 122                                               &io_req->req_flags)) {
 123                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 124                                 spin_unlock_bh(&tgt->tgt_lock);
 125
 126                                 return;
 127                         }
 128                 } else {
 129                         /*
 130                          * Handle ELS timeout.
 131                          * tgt_lock is used to sync compl path and timeout
 132                          * path. If els compl path is processing this IO, we
 133                          * have nothing to do here, just release the timer hold
 134                          */
 135                         BNX2FC_IO_DBG(io_req, "ELS timed out\n");
 136                         if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
 137                                                &io_req->req_flags))
 138                                 goto done;
 139
 140                         /* Indicate the cb_func that this ELS is timed out */
 141                         set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
 142
 143                         if ((io_req->cb_func) && (io_req->cb_arg)) {
 144                                 io_req->cb_func(io_req->cb_arg);
 145                                 io_req->cb_arg = NULL;
 146                         }
 147                 }
 148                 break;
 149         default:
 150                 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
 151                         cmd_type);
 152                 break;
 153         }
 154
 155 done:
 156         /* release the cmd that was held when timer was set */
 157         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 158         spin_unlock_bh(&tgt->tgt_lock);
 159 }
 160
 161 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
 162 {
 163         /* Called with host lock held */
 164         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 165
 166         /*
 167          * active_cmd_queue may have other command types as well,
 168          * and during flush operation,  we want to error back only
 169          * scsi commands.
 170          */
 171         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 172                 return;
 173
 174         BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
 175         if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
 176                 /* Do not call scsi done for this IO */
 177                 return;
 178         }
 179
 180         bnx2fc_unmap_sg_list(io_req);
 181         io_req->sc_cmd = NULL;
 182         if (!sc_cmd) {
 183                 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
 184                                     "IO(0x%x) already cleaned up\n",
 185                        io_req->xid);
 186                 return;
 187         }
 188         sc_cmd->result = err_code << 16;
 189
 190         BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
 191                 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
 192                 sc_cmd->allowed);
 193         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
 194         sc_cmd->SCp.ptr = NULL;
 195         sc_cmd->scsi_done(sc_cmd);
 196 }
 197
 198 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 199 {
 200         struct bnx2fc_cmd_mgr *cmgr;
 201         struct io_bdt *bdt_info;
 202         struct bnx2fc_cmd *io_req;
 203         size_t len;
 204         u32 mem_size;
 205         u16 xid;
 206         int i;
 207         int num_ios, num_pri_ios;
 208         size_t bd_tbl_sz;
 209         int arr_sz = num_possible_cpus() + 1;
 210         u16 min_xid = BNX2FC_MIN_XID;
 211         u16 max_xid = hba->max_xid;
 212
 213         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 214                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 215                                         and max_xid 0x%x\n", min_xid, max_xid);
 216                 return NULL;
 217         }
 218         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 219
 220         num_ios = max_xid - min_xid + 1;
 221         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 222         len += sizeof(struct bnx2fc_cmd_mgr);
 223
 224         cmgr = kzalloc(len, GFP_KERNEL);
 225         if (!cmgr) {
 226                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
 227                 return NULL;
 228         }
 229
 230         cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
 231                                   arr_sz, GFP_KERNEL);
 232         if (!cmgr->free_list) {
 233                 printk(KERN_ERR PFX "failed to alloc free_list\n");
 234                 goto mem_err;
 235         }
 236
 237         cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
 238                                        arr_sz, GFP_KERNEL);
 239         if (!cmgr->free_list_lock) {
 240                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 241                 kfree(cmgr->free_list);
 242                 cmgr->free_list = NULL;
 243                 goto mem_err;
 244         }
 245
 246         cmgr->hba = hba;
 247         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 248
 249         for (i = 0; i < arr_sz; i++)  {
 250                 INIT_LIST_HEAD(&cmgr->free_list[i]);
 251                 spin_lock_init(&cmgr->free_list_lock[i]);
 252         }
 253
 254         /*
 255          * Pre-allocated pool of bnx2fc_cmds.
 256          * Last entry in the free list array is the free list
 257          * of slow path requests.
 258          */
 259         xid = BNX2FC_MIN_XID;
 260         num_pri_ios = num_ios - hba->elstm_xids;
 261         for (i = 0; i < num_ios; i++) {
 262                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 263
 264                 if (!io_req) {
 265                         printk(KERN_ERR PFX "failed to alloc io_req\n");
 266                         goto mem_err;
 267                 }
 268
 269                 INIT_LIST_HEAD(&io_req->link);
 270                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 271
 272                 io_req->xid = xid++;
 273                 if (i < num_pri_ios)
 274                         list_add_tail(&io_req->link,
 275                                 &cmgr->free_list[io_req->xid %
 276                                                  num_possible_cpus()]);
 277                 else
 278                         list_add_tail(&io_req->link,
 279                                 &cmgr->free_list[num_possible_cpus()]);
 280                 io_req++;
 281         }
 282
 283         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 284         mem_size = num_ios * sizeof(struct io_bdt *);
 285         cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
 286         if (!cmgr->io_bdt_pool) {
 287                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 288                 goto mem_err;
 289         }
 290
 291         mem_size = sizeof(struct io_bdt);
 292         for (i = 0; i < num_ios; i++) {
 293                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 294                 if (!cmgr->io_bdt_pool[i]) {
 295                         printk(KERN_ERR PFX "failed to alloc "
 296                                 "io_bdt_pool[%d]\n", i);
 297                         goto mem_err;
 298                 }
 299         }
 300
 301         /* Allocate an map fcoe_bdt_ctx structures */
 302         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 303         for (i = 0; i < num_ios; i++) {
 304                 bdt_info = cmgr->io_bdt_pool[i];
 305                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 306                                                       bd_tbl_sz,
 307                                                       &bdt_info->bd_tbl_dma,
 308                                                       GFP_KERNEL);
 309                 if (!bdt_info->bd_tbl) {
 310                         printk(KERN_ERR PFX "failed to alloc "
 311                                 "bdt_tbl[%d]\n", i);
 312                         goto mem_err;
 313                 }
 314         }
 315
 316         return cmgr;
 317
 318 mem_err:
 319         bnx2fc_cmd_mgr_free(cmgr);
 320         return NULL;
 321 }
 322
 323 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 324 {
 325         struct io_bdt *bdt_info;
 326         struct bnx2fc_hba *hba = cmgr->hba;
 327         size_t bd_tbl_sz;
 328         u16 min_xid = BNX2FC_MIN_XID;
 329         u16 max_xid = hba->max_xid;
 330         int num_ios;
 331         int i;
 332
 333         num_ios = max_xid - min_xid + 1;
 334
 335         /* Free fcoe_bdt_ctx structures */
 336         if (!cmgr->io_bdt_pool)
 337                 goto free_cmd_pool;
 338
 339         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 340         for (i = 0; i < num_ios; i++) {
 341                 bdt_info = cmgr->io_bdt_pool[i];
 342                 if (bdt_info->bd_tbl) {
 343                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 344                                             bdt_info->bd_tbl,
 345                                             bdt_info->bd_tbl_dma);
 346                         bdt_info->bd_tbl = NULL;
 347                 }
 348         }
 349
 350         /* Destroy io_bdt pool */
 351         for (i = 0; i < num_ios; i++) {
 352                 kfree(cmgr->io_bdt_pool[i]);
 353                 cmgr->io_bdt_pool[i] = NULL;
 354         }
 355
 356         kfree(cmgr->io_bdt_pool);
 357         cmgr->io_bdt_pool = NULL;
 358
 359 free_cmd_pool:
 360         kfree(cmgr->free_list_lock);
 361
 362         /* Destroy cmd pool */
 363         if (!cmgr->free_list)
 364                 goto free_cmgr;
 365
 366         for (i = 0; i < num_possible_cpus() + 1; i++)  {
 367                 struct bnx2fc_cmd *tmp, *io_req;
 368
 369                 list_for_each_entry_safe(io_req, tmp,
 370                                          &cmgr->free_list[i], link) {
 371                         list_del(&io_req->link);
 372                         kfree(io_req);
 373                 }
 374         }
 375         kfree(cmgr->free_list);
 376 free_cmgr:
 377         /* Free command manager itself */
 378         kfree(cmgr);
 379 }
 380
 381 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 382 {
 383         struct fcoe_port *port = tgt->port;
 384         struct bnx2fc_interface *interface = port->priv;
 385         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 386         struct bnx2fc_cmd *io_req;
 387         struct list_head *listp;
 388         struct io_bdt *bd_tbl;
 389         int index = RESERVE_FREE_LIST_INDEX;
 390         u32 free_sqes;
 391         u32 max_sqes;
 392         u16 xid;
 393
 394         max_sqes = tgt->max_sqes;
 395         switch (type) {
 396         case BNX2FC_TASK_MGMT_CMD:
 397                 max_sqes = BNX2FC_TM_MAX_SQES;
 398                 break;
 399         case BNX2FC_ELS:
 400                 max_sqes = BNX2FC_ELS_MAX_SQES;
 401                 break;
 402         default:
 403                 break;
 404         }
 405
 406         /*
 407          * NOTE: Free list insertions and deletions are protected with
 408          * cmgr lock
 409          */
 410         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 411         free_sqes = atomic_read(&tgt->free_sqes);
 412         if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 413             (tgt->num_active_ios.counter  >= max_sqes) ||
 414             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 415                 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 416                         "ios(%d):sqes(%d)\n",
 417                         tgt->num_active_ios.counter, tgt->max_sqes);
 418                 if (list_empty(&(cmd_mgr->free_list[index])))
 419                         printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 420                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 421                 return NULL;
 422         }
 423
 424         listp = (struct list_head *)
 425                         cmd_mgr->free_list[index].next;
 426         list_del_init(listp);
 427         io_req = (struct bnx2fc_cmd *) listp;
 428         xid = io_req->xid;
 429         cmd_mgr->cmds[xid] = io_req;
 430         atomic_inc(&tgt->num_active_ios);
 431         atomic_dec(&tgt->free_sqes);
 432         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 433
 434         INIT_LIST_HEAD(&io_req->link);
 435
 436         io_req->port = port;
 437         io_req->cmd_mgr = cmd_mgr;
 438         io_req->req_flags = 0;
 439         io_req->cmd_type = type;
 440
 441         /* Bind io_bdt for this io_req */
 442         /* Have a static link between io_req and io_bdt_pool */
 443         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 444         bd_tbl->io_req = io_req;
 445
 446         /* Hold the io_req  against deletion */
 447         kref_init(&io_req->refcount);
 448         return io_req;
 449 }
 450
 451 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 452 {
 453         struct fcoe_port *port = tgt->port;
 454         struct bnx2fc_interface *interface = port->priv;
 455         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 456         struct bnx2fc_cmd *io_req;
 457         struct list_head *listp;
 458         struct io_bdt *bd_tbl;
 459         u32 free_sqes;
 460         u32 max_sqes;
 461         u16 xid;
 462         int index = get_cpu();
 463
 464         max_sqes = BNX2FC_SCSI_MAX_SQES;
 465         /*
 466          * NOTE: Free list insertions and deletions are protected with
 467          * cmgr lock
 468          */
 469         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 470         free_sqes = atomic_read(&tgt->free_sqes);
 471         if ((list_empty(&cmd_mgr->free_list[index])) ||
 472             (tgt->num_active_ios.counter  >= max_sqes) ||
 473             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 474                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 475                 put_cpu();
 476                 return NULL;
 477         }
 478
 479         listp = (struct list_head *)
 480                 cmd_mgr->free_list[index].next;
 481         list_del_init(listp);
 482         io_req = (struct bnx2fc_cmd *) listp;
 483         xid = io_req->xid;
 484         cmd_mgr->cmds[xid] = io_req;
 485         atomic_inc(&tgt->num_active_ios);
 486         atomic_dec(&tgt->free_sqes);
 487         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 488         put_cpu();
 489
 490         INIT_LIST_HEAD(&io_req->link);
 491
 492         io_req->port = port;
 493         io_req->cmd_mgr = cmd_mgr;
 494         io_req->req_flags = 0;
 495
 496         /* Bind io_bdt for this io_req */
 497         /* Have a static link between io_req and io_bdt_pool */
 498         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 499         bd_tbl->io_req = io_req;
 500
 501         /* Hold the io_req  against deletion */
 502         kref_init(&io_req->refcount);
 503         return io_req;
 504 }
 505
 506 void bnx2fc_cmd_release(struct kref *ref)
 507 {
 508         struct bnx2fc_cmd *io_req = container_of(ref,
 509                                                 struct bnx2fc_cmd, refcount);
 510         struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 511         int index;
 512
 513         if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 514                 index = io_req->xid % num_possible_cpus();
 515         else
 516                 index = RESERVE_FREE_LIST_INDEX;
 517
 518
 519         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 520         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 521                 bnx2fc_free_mp_resc(io_req);
 522         cmd_mgr->cmds[io_req->xid] = NULL;
 523         /* Delete IO from retire queue */
 524         list_del_init(&io_req->link);
 525         /* Add it to the free list */
 526         list_add(&io_req->link,
 527                         &cmd_mgr->free_list[index]);
 528         atomic_dec(&io_req->tgt->num_active_ios);
 529         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 530
 531 }
 532
 533 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 534 {
 535         struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 536         struct bnx2fc_interface *interface = io_req->port->priv;
 537         struct bnx2fc_hba *hba = interface->hba;
 538         size_t sz = sizeof(struct fcoe_bd_ctx);
 539
 540         /* clear tm flags */
 541         mp_req->tm_flags = 0;
 542         if (mp_req->mp_req_bd) {
 543                 dma_free_coherent(&hba->pcidev->dev, sz,
 544                                      mp_req->mp_req_bd,
 545                                      mp_req->mp_req_bd_dma);
 546                 mp_req->mp_req_bd = NULL;
 547         }
 548         if (mp_req->mp_resp_bd) {
 549                 dma_free_coherent(&hba->pcidev->dev, sz,
 550                                      mp_req->mp_resp_bd,
 551                                      mp_req->mp_resp_bd_dma);
 552                 mp_req->mp_resp_bd = NULL;
 553         }
 554         if (mp_req->req_buf) {
 555                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 556                                      mp_req->req_buf,
 557                                      mp_req->req_buf_dma);
 558                 mp_req->req_buf = NULL;
 559         }
 560         if (mp_req->resp_buf) {
 561                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 562                                      mp_req->resp_buf,
 563                                      mp_req->resp_buf_dma);
 564                 mp_req->resp_buf = NULL;
 565         }
 566 }
 567
 568 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 569 {
 570         struct bnx2fc_mp_req *mp_req;
 571         struct fcoe_bd_ctx *mp_req_bd;
 572         struct fcoe_bd_ctx *mp_resp_bd;
 573         struct bnx2fc_interface *interface = io_req->port->priv;
 574         struct bnx2fc_hba *hba = interface->hba;
 575         dma_addr_t addr;
 576         size_t sz;
 577
 578         mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 579         memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 580
 581         if (io_req->cmd_type != BNX2FC_ELS) {
 582                 mp_req->req_len = sizeof(struct fcp_cmnd);
 583                 io_req->data_xfer_len = mp_req->req_len;
 584         } else
 585                 mp_req->req_len = io_req->data_xfer_len;
 586
 587         mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 588                                              &mp_req->req_buf_dma,
 589                                              GFP_ATOMIC);
 590         if (!mp_req->req_buf) {
 591                 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 592                 bnx2fc_free_mp_resc(io_req);
 593                 return FAILED;
 594         }
 595
 596         mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 597                                               &mp_req->resp_buf_dma,
 598                                               GFP_ATOMIC);
 599         if (!mp_req->resp_buf) {
 600                 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 601                 bnx2fc_free_mp_resc(io_req);
 602                 return FAILED;
 603         }
 604         memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
 605         memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
 606
 607         /* Allocate and map mp_req_bd and mp_resp_bd */
 608         sz = sizeof(struct fcoe_bd_ctx);
 609         mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 610                                                  &mp_req->mp_req_bd_dma,
 611                                                  GFP_ATOMIC);
 612         if (!mp_req->mp_req_bd) {
 613                 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 614                 bnx2fc_free_mp_resc(io_req);
 615                 return FAILED;
 616         }
 617         mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 618                                                  &mp_req->mp_resp_bd_dma,
 619                                                  GFP_ATOMIC);
 620         if (!mp_req->mp_resp_bd) {
 621                 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 622                 bnx2fc_free_mp_resc(io_req);
 623                 return FAILED;
 624         }
 625         /* Fill bd table */
 626         addr = mp_req->req_buf_dma;
 627         mp_req_bd = mp_req->mp_req_bd;
 628         mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 629         mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 630         mp_req_bd->buf_len = CNIC_PAGE_SIZE;
 631         mp_req_bd->flags = 0;
 632
 633         /*
 634          * MP buffer is either a task mgmt command or an ELS.
 635          * So the assumption is that it consumes a single bd
 636          * entry in the bd table
 637          */
 638         mp_resp_bd = mp_req->mp_resp_bd;
 639         addr = mp_req->resp_buf_dma;
 640         mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 641         mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 642         mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
 643         mp_resp_bd->flags = 0;
 644
 645         return SUCCESS;
 646 }
 647
 648 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 649 {
 650         struct fc_lport *lport;
 651         struct fc_rport *rport;
 652         struct fc_rport_libfc_priv *rp;
 653         struct fcoe_port *port;
 654         struct bnx2fc_interface *interface;
 655         struct bnx2fc_rport *tgt;
 656         struct bnx2fc_cmd *io_req;
 657         struct bnx2fc_mp_req *tm_req;
 658         struct fcoe_task_ctx_entry *task;
 659         struct fcoe_task_ctx_entry *task_page;
 660         struct Scsi_Host *host = sc_cmd->device->host;
 661         struct fc_frame_header *fc_hdr;
 662         struct fcp_cmnd *fcp_cmnd;
 663         int task_idx, index;
 664         int rc = SUCCESS;
 665         u16 xid;
 666         u32 sid, did;
 667         unsigned long start = jiffies;
 668
 669         lport = shost_priv(host);
 670         rport = starget_to_rport(scsi_target(sc_cmd->device));
 671         port = lport_priv(lport);
 672         interface = port->priv;
 673
 674         if (rport == NULL) {
 675                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 676                 rc = FAILED;
 677                 goto tmf_err;
 678         }
 679         rp = rport->dd_data;
 680
 681         rc = fc_block_scsi_eh(sc_cmd);
 682         if (rc)
 683                 return rc;
 684
 685         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 686                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 687                 rc = FAILED;
 688                 goto tmf_err;
 689         }
 690         /* rport and tgt are allocated together, so tgt should be non-NULL */
 691         tgt = (struct bnx2fc_rport *)&rp[1];
 692
 693         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 694                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 695                 rc = FAILED;
 696                 goto tmf_err;
 697         }
 698 retry_tmf:
 699         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 700         if (!io_req) {
 701                 if (time_after(jiffies, start + HZ)) {
 702                         printk(KERN_ERR PFX "tmf: Failed TMF");
 703                         rc = FAILED;
 704                         goto tmf_err;
 705                 }
 706                 msleep(20);
 707                 goto retry_tmf;
 708         }
 709         /* Initialize rest of io_req fields */
 710         io_req->sc_cmd = sc_cmd;
 711         io_req->port = port;
 712         io_req->tgt = tgt;
 713
 714         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 715
 716         rc = bnx2fc_init_mp_req(io_req);
 717         if (rc == FAILED) {
 718                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 719                 spin_lock_bh(&tgt->tgt_lock);
 720                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 721                 spin_unlock_bh(&tgt->tgt_lock);
 722                 goto tmf_err;
 723         }
 724
 725         /* Set TM flags */
 726         io_req->io_req_flags = 0;
 727         tm_req->tm_flags = tm_flags;
 728
 729         /* Fill FCP_CMND */
 730         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 731         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 732         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 733         fcp_cmnd->fc_dl = 0;
 734
 735         /* Fill FC header */
 736         fc_hdr = &(tm_req->req_fc_hdr);
 737         sid = tgt->sid;
 738         did = rport->port_id;
 739         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 740                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 741                            FC_FC_SEQ_INIT, 0);
 742         /* Obtain exchange id */
 743         xid = io_req->xid;
 744
 745         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 746         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 747         index = xid % BNX2FC_TASKS_PER_PAGE;
 748
 749         /* Initialize task context for this IO request */
 750         task_page = (struct fcoe_task_ctx_entry *)
 751                         interface->hba->task_ctx[task_idx];
 752         task = &(task_page[index]);
 753         bnx2fc_init_mp_task(io_req, task);
 754
 755         sc_cmd->SCp.ptr = (char *)io_req;
 756
 757         /* Obtain free SQ entry */
 758         spin_lock_bh(&tgt->tgt_lock);
 759         bnx2fc_add_2_sq(tgt, xid);
 760
 761         /* Enqueue the io_req to active_tm_queue */
 762         io_req->on_tmf_queue = 1;
 763         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 764
 765         init_completion(&io_req->tm_done);
 766         io_req->wait_for_comp = 1;
 767
 768         /* Ring doorbell */
 769         bnx2fc_ring_doorbell(tgt);
 770         spin_unlock_bh(&tgt->tgt_lock);
 771
 772         rc = wait_for_completion_timeout(&io_req->tm_done,
 773                                          BNX2FC_TM_TIMEOUT * HZ);
 774         spin_lock_bh(&tgt->tgt_lock);
 775
 776         io_req->wait_for_comp = 0;
 777         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 778                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 779                 if (io_req->on_tmf_queue) {
 780                         list_del_init(&io_req->link);
 781                         io_req->on_tmf_queue = 0;
 782                 }
 783                 io_req->wait_for_comp = 1;
 784                 bnx2fc_initiate_cleanup(io_req);
 785                 spin_unlock_bh(&tgt->tgt_lock);
 786                 rc = wait_for_completion_timeout(&io_req->tm_done,
 787                                                  BNX2FC_FW_TIMEOUT);
 788                 spin_lock_bh(&tgt->tgt_lock);
 789                 io_req->wait_for_comp = 0;
 790                 if (!rc)
 791                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 792         }
 793
 794         spin_unlock_bh(&tgt->tgt_lock);
 795
 796         if (!rc) {
 797                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 798                 rc = FAILED;
 799         } else {
 800                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 801                 rc = SUCCESS;
 802         }
 803 tmf_err:
 804         return rc;
 805 }
 806
 807 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 808 {
 809         struct fc_lport *lport;
 810         struct bnx2fc_rport *tgt = io_req->tgt;
 811         struct fc_rport *rport = tgt->rport;
 812         struct fc_rport_priv *rdata = tgt->rdata;
 813         struct bnx2fc_interface *interface;
 814         struct fcoe_port *port;
 815         struct bnx2fc_cmd *abts_io_req;
 816         struct fcoe_task_ctx_entry *task;
 817         struct fcoe_task_ctx_entry *task_page;
 818         struct fc_frame_header *fc_hdr;
 819         struct bnx2fc_mp_req *abts_req;
 820         int task_idx, index;
 821         u32 sid, did;
 822         u16 xid;
 823         int rc = SUCCESS;
 824         u32 r_a_tov = rdata->r_a_tov;
 825
 826         /* called with tgt_lock held */
 827         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 828
 829         port = io_req->port;
 830         interface = port->priv;
 831         lport = port->lport;
 832
 833         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 834                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 835                 rc = FAILED;
 836                 goto abts_err;
 837         }
 838
 839         if (rport == NULL) {
 840                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 841                 rc = FAILED;
 842                 goto abts_err;
 843         }
 844
 845         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 846                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 847                 rc = FAILED;
 848                 goto abts_err;
 849         }
 850
 851         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 852         if (!abts_io_req) {
 853                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 854                 rc = FAILED;
 855                 goto abts_err;
 856         }
 857
 858         /* Initialize rest of io_req fields */
 859         abts_io_req->sc_cmd = NULL;
 860         abts_io_req->port = port;
 861         abts_io_req->tgt = tgt;
 862         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 863
 864         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 865         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 866
 867         /* Fill FC header */
 868         fc_hdr = &(abts_req->req_fc_hdr);
 869
 870         /* Obtain oxid and rxid for the original exchange to be aborted */
 871         fc_hdr->fh_ox_id = htons(io_req->xid);
 872         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 873
 874         sid = tgt->sid;
 875         did = rport->port_id;
 876
 877         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 878                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 879                            FC_FC_SEQ_INIT, 0);
 880
 881         xid = abts_io_req->xid;
 882         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 883         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 884         index = xid % BNX2FC_TASKS_PER_PAGE;
 885
 886         /* Initialize task context for this IO request */
 887         task_page = (struct fcoe_task_ctx_entry *)
 888                         interface->hba->task_ctx[task_idx];
 889         task = &(task_page[index]);
 890         bnx2fc_init_mp_task(abts_io_req, task);
 891
 892         /*
 893          * ABTS task is a temporary task that will be cleaned up
 894          * irrespective of ABTS response. We need to start the timer
 895          * for the original exchange, as the CQE is posted for the original
 896          * IO request.
 897          *
 898          * Timer for ABTS is started only when it is originated by a
 899          * TM request. For the ABTS issued as part of ULP timeout,
 900          * scsi-ml maintains the timers.
 901          */
 902
 903         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 904         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 905
 906         /* Obtain free SQ entry */
 907         bnx2fc_add_2_sq(tgt, xid);
 908
 909         /* Ring doorbell */
 910         bnx2fc_ring_doorbell(tgt);
 911
 912 abts_err:
 913         return rc;
 914 }
 915
 916 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 917                                 enum fc_rctl r_ctl)
 918 {
 919         struct fc_lport *lport;
 920         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 921         struct bnx2fc_interface *interface;
 922         struct fcoe_port *port;
 923         struct bnx2fc_cmd *seq_clnp_req;
 924         struct fcoe_task_ctx_entry *task;
 925         struct fcoe_task_ctx_entry *task_page;
 926         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 927         int task_idx, index;
 928         u16 xid;
 929         int rc = 0;
 930
 931         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 932                    orig_io_req->xid);
 933         kref_get(&orig_io_req->refcount);
 934
 935         port = orig_io_req->port;
 936         interface = port->priv;
 937         lport = port->lport;
 938
 939         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 940         if (!cb_arg) {
 941                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 942                 rc = -ENOMEM;
 943                 goto cleanup_err;
 944         }
 945
 946         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 947         if (!seq_clnp_req) {
 948                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 949                 rc = -ENOMEM;
 950                 kfree(cb_arg);
 951                 goto cleanup_err;
 952         }
 953         /* Initialize rest of io_req fields */
 954         seq_clnp_req->sc_cmd = NULL;
 955         seq_clnp_req->port = port;
 956         seq_clnp_req->tgt = tgt;
 957         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 958
 959         xid = seq_clnp_req->xid;
 960
 961         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 962         index = xid % BNX2FC_TASKS_PER_PAGE;
 963
 964         /* Initialize task context for this IO request */
 965         task_page = (struct fcoe_task_ctx_entry *)
 966                      interface->hba->task_ctx[task_idx];
 967         task = &(task_page[index]);
 968         cb_arg->aborted_io_req = orig_io_req;
 969         cb_arg->io_req = seq_clnp_req;
 970         cb_arg->r_ctl = r_ctl;
 971         cb_arg->offset = offset;
 972         seq_clnp_req->cb_arg = cb_arg;
 973
 974         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 975         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 976
 977         /* Obtain free SQ entry */
 978         bnx2fc_add_2_sq(tgt, xid);
 979
 980         /* Ring doorbell */
 981         bnx2fc_ring_doorbell(tgt);
 982 cleanup_err:
 983         return rc;
 984 }
 985
 986 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
 987 {
 988         struct fc_lport *lport;
 989         struct bnx2fc_rport *tgt = io_req->tgt;
 990         struct bnx2fc_interface *interface;
 991         struct fcoe_port *port;
 992         struct bnx2fc_cmd *cleanup_io_req;
 993         struct fcoe_task_ctx_entry *task;
 994         struct fcoe_task_ctx_entry *task_page;
 995         int task_idx, index;
 996         u16 xid, orig_xid;
 997         int rc = 0;
 998
 999         /* ASSUMPTION: called with tgt_lock held */
1000         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1001
1002         port = io_req->port;
1003         interface = port->priv;
1004         lport = port->lport;
1005
1006         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1007         if (!cleanup_io_req) {
1008                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1009                 rc = -1;
1010                 goto cleanup_err;
1011         }
1012
1013         /* Initialize rest of io_req fields */
1014         cleanup_io_req->sc_cmd = NULL;
1015         cleanup_io_req->port = port;
1016         cleanup_io_req->tgt = tgt;
1017         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1018
1019         xid = cleanup_io_req->xid;
1020
1021         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1022         index = xid % BNX2FC_TASKS_PER_PAGE;
1023
1024         /* Initialize task context for this IO request */
1025         task_page = (struct fcoe_task_ctx_entry *)
1026                         interface->hba->task_ctx[task_idx];
1027         task = &(task_page[index]);
1028         orig_xid = io_req->xid;
1029
1030         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1031
1032         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1033
1034         /* Obtain free SQ entry */
1035         bnx2fc_add_2_sq(tgt, xid);
1036
1037         /* Ring doorbell */
1038         bnx2fc_ring_doorbell(tgt);
1039
1040 cleanup_err:
1041         return rc;
1042 }
1043
1044 /**
1045  * bnx2fc_eh_target_reset: Reset a target
1046  *
1047  * @sc_cmd:     SCSI command
1048  *
1049  * Set from SCSI host template to send task mgmt command to the target
1050  *      and wait for the response
1051  */
1052 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1053 {
1054         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1055 }
1056
1057 /**
1058  * bnx2fc_eh_device_reset - Reset a single LUN
1059  *
1060  * @sc_cmd:     SCSI command
1061  *
1062  * Set from SCSI host template to send task mgmt command to the target
1063  *      and wait for the response
1064  */
1065 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1066 {
1067         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1068 }
1069
1070 int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1071 {
1072         struct bnx2fc_rport *tgt = io_req->tgt;
1073         int rc = SUCCESS;
1074
1075         io_req->wait_for_comp = 1;
1076         bnx2fc_initiate_cleanup(io_req);
1077
1078         spin_unlock_bh(&tgt->tgt_lock);
1079
1080         wait_for_completion(&io_req->tm_done);
1081
1082         io_req->wait_for_comp = 0;
1083         /*
1084          * release the reference taken in eh_abort to allow the
1085          * target to re-login after flushing IOs
1086          */
1087         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1088
1089         spin_lock_bh(&tgt->tgt_lock);
1090         return rc;
1091 }
1092 /**
1093  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1094  *                      SCSI command
1095  *
1096  * @sc_cmd:     SCSI_ML command pointer
1097  *
1098  * SCSI abort request handler
1099  */
1100 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1101 {
1102         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1103         struct fc_rport_libfc_priv *rp = rport->dd_data;
1104         struct bnx2fc_cmd *io_req;
1105         struct fc_lport *lport;
1106         struct bnx2fc_rport *tgt;
1107         int rc;
1108
1109         rc = fc_block_scsi_eh(sc_cmd);
1110         if (rc)
1111                 return rc;
1112
1113         lport = shost_priv(sc_cmd->device->host);
1114         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1115                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1116                 return FAILED;
1117         }
1118
1119         tgt = (struct bnx2fc_rport *)&rp[1];
1120
1121         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1122
1123         spin_lock_bh(&tgt->tgt_lock);
1124         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1125         if (!io_req) {
1126                 /* Command might have just completed */
1127                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1128                 spin_unlock_bh(&tgt->tgt_lock);
1129                 return SUCCESS;
1130         }
1131         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1132                       io_req->refcount.refcount.counter);
1133
1134         /* Hold IO request across abort processing */
1135         kref_get(&io_req->refcount);
1136
1137         BUG_ON(tgt != io_req->tgt);
1138
1139         /* Remove the io_req from the active_q. */
1140         /*
1141          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1142          * issue an ABTS on this particular IO req, as the
1143          * io_req is no longer in the active_q.
1144          */
1145         if (tgt->flush_in_prog) {
1146                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1147                         "flush in progress\n", io_req->xid);
1148                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1149                 spin_unlock_bh(&tgt->tgt_lock);
1150                 return SUCCESS;
1151         }
1152
1153         if (io_req->on_active_queue == 0) {
1154                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1155                                 "not on active_q\n", io_req->xid);
1156                 /*
1157                  * This condition can happen only due to the FW bug,
1158                  * where we do not receive cleanup response from
1159                  * the FW. Handle this case gracefully by erroring
1160                  * back the IO request to SCSI-ml
1161                  */
1162                 bnx2fc_scsi_done(io_req, DID_ABORT);
1163
1164                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1165                 spin_unlock_bh(&tgt->tgt_lock);
1166                 return SUCCESS;
1167         }
1168
1169         /*
1170          * Only eh_abort processing will remove the IO from
1171          * active_cmd_q before processing the request. this is
1172          * done to avoid race conditions between IOs aborted
1173          * as part of task management completion and eh_abort
1174          * processing
1175          */
1176         list_del_init(&io_req->link);
1177         io_req->on_active_queue = 0;
1178         /* Move IO req to retire queue */
1179         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1180
1181         init_completion(&io_req->tm_done);
1182
1183         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1184                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1185                                 "already in abts processing\n", io_req->xid);
1186                 if (cancel_delayed_work(&io_req->timeout_work))
1187                         kref_put(&io_req->refcount,
1188                                  bnx2fc_cmd_release); /* drop timer hold */
1189                 rc = bnx2fc_abts_cleanup(io_req);
1190                 /* This only occurs when an task abort was requested while ABTS
1191                    is in progress.  Setting the IO_CLEANUP flag will skip the
1192                    RRQ process in the case when the fw generated SCSI_CMD cmpl
1193                    was a result from the ABTS request rather than the CLEANUP
1194                    request */
1195                 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1196                 goto out;
1197         }
1198
1199         /* Cancel the current timer running on this io_req */
1200         if (cancel_delayed_work(&io_req->timeout_work))
1201                 kref_put(&io_req->refcount,
1202                          bnx2fc_cmd_release); /* drop timer hold */
1203         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1204         io_req->wait_for_comp = 1;
1205         rc = bnx2fc_initiate_abts(io_req);
1206         if (rc == FAILED) {
1207                 bnx2fc_initiate_cleanup(io_req);
1208                 spin_unlock_bh(&tgt->tgt_lock);
1209                 wait_for_completion(&io_req->tm_done);
1210                 spin_lock_bh(&tgt->tgt_lock);
1211                 io_req->wait_for_comp = 0;
1212                 goto done;
1213         }
1214         spin_unlock_bh(&tgt->tgt_lock);
1215
1216         wait_for_completion(&io_req->tm_done);
1217
1218         spin_lock_bh(&tgt->tgt_lock);
1219         io_req->wait_for_comp = 0;
1220         if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1221                 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1222                 rc = SUCCESS;
1223         } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1224                                       &io_req->req_flags))) {
1225                 /* Let the scsi-ml try to recover this command */
1226                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1227                        io_req->xid);
1228                 rc = bnx2fc_abts_cleanup(io_req);
1229                 goto out;
1230         } else {
1231                 /*
1232                  * We come here even when there was a race condition
1233                  * between timeout and abts completion, and abts
1234                  * completion happens just in time.
1235                  */
1236                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1237                 rc = SUCCESS;
1238                 bnx2fc_scsi_done(io_req, DID_ABORT);
1239                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1240         }
1241 done:
1242         /* release the reference taken in eh_abort */
1243         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1244 out:
1245         spin_unlock_bh(&tgt->tgt_lock);
1246         return rc;
1247 }
1248
1249 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1250                                       struct fcoe_task_ctx_entry *task,
1251                                       u8 rx_state)
1252 {
1253         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1254         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1255         u32 offset = cb_arg->offset;
1256         enum fc_rctl r_ctl = cb_arg->r_ctl;
1257         int rc = 0;
1258         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1259
1260         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1261                               "cmd_type = %d\n",
1262                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1263
1264         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1265                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1266                         seq_clnp_req->xid);
1267                 goto free_cb_arg;
1268         }
1269
1270         spin_unlock_bh(&tgt->tgt_lock);
1271         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1272         spin_lock_bh(&tgt->tgt_lock);
1273
1274         if (rc)
1275                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1276                         " IO will abort\n");
1277         seq_clnp_req->cb_arg = NULL;
1278         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1279 free_cb_arg:
1280         kfree(cb_arg);
1281         return;
1282 }
1283
1284 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1285                                   struct fcoe_task_ctx_entry *task,
1286                                   u8 num_rq)
1287 {
1288         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1289                               "refcnt = %d, cmd_type = %d\n",
1290                    io_req->refcount.refcount.counter, io_req->cmd_type);
1291         bnx2fc_scsi_done(io_req, DID_ERROR);
1292         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1293         if (io_req->wait_for_comp)
1294                 complete(&io_req->tm_done);
1295 }
1296
1297 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1298                                struct fcoe_task_ctx_entry *task,
1299                                u8 num_rq)
1300 {
1301         u32 r_ctl;
1302         u32 r_a_tov = FC_DEF_R_A_TOV;
1303         u8 issue_rrq = 0;
1304         struct bnx2fc_rport *tgt = io_req->tgt;
1305
1306         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1307                               "refcnt = %d, cmd_type = %d\n",
1308                    io_req->xid,
1309                    io_req->refcount.refcount.counter, io_req->cmd_type);
1310
1311         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1312                                        &io_req->req_flags)) {
1313                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1314                                 " this io\n");
1315                 return;
1316         }
1317
1318         /* Do not issue RRQ as this IO is already cleanedup */
1319         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1320                                 &io_req->req_flags))
1321                 goto io_compl;
1322
1323         /*
1324          * For ABTS issued due to SCSI eh_abort_handler, timeout
1325          * values are maintained by scsi-ml itself. Cancel timeout
1326          * in case ABTS issued as part of task management function
1327          * or due to FW error.
1328          */
1329         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1330                 if (cancel_delayed_work(&io_req->timeout_work))
1331                         kref_put(&io_req->refcount,
1332                                  bnx2fc_cmd_release); /* drop timer hold */
1333
1334         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1335
1336         switch (r_ctl) {
1337         case FC_RCTL_BA_ACC:
1338                 /*
1339                  * Dont release this cmd yet. It will be relesed
1340                  * after we get RRQ response
1341                  */
1342                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1343                 issue_rrq = 1;
1344                 break;
1345
1346         case FC_RCTL_BA_RJT:
1347                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1348                 break;
1349         default:
1350                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1351                 break;
1352         }
1353
1354         if (issue_rrq) {
1355                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1356                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1357         }
1358         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1359         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1360
1361 io_compl:
1362         if (io_req->wait_for_comp) {
1363                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1364                                        &io_req->req_flags))
1365                         complete(&io_req->tm_done);
1366         } else {
1367                 /*
1368                  * We end up here when ABTS is issued as
1369                  * in asynchronous context, i.e., as part
1370                  * of task management completion, or
1371                  * when FW error is received or when the
1372                  * ABTS is issued when the IO is timed
1373                  * out.
1374                  */
1375
1376                 if (io_req->on_active_queue) {
1377                         list_del_init(&io_req->link);
1378                         io_req->on_active_queue = 0;
1379                         /* Move IO req to retire queue */
1380                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1381                 }
1382                 bnx2fc_scsi_done(io_req, DID_ERROR);
1383                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1384         }
1385 }
1386
1387 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1388 {
1389         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1390         struct bnx2fc_rport *tgt = io_req->tgt;
1391         struct bnx2fc_cmd *cmd, *tmp;
1392         u64 tm_lun = sc_cmd->device->lun;
1393         u64 lun;
1394         int rc = 0;
1395
1396         /* called with tgt_lock held */
1397         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1398         /*
1399          * Walk thru the active_ios queue and ABORT the IO
1400          * that matches with the LUN that was reset
1401          */
1402         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1403                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1404                 lun = cmd->sc_cmd->device->lun;
1405                 if (lun == tm_lun) {
1406                         /* Initiate ABTS on this cmd */
1407                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1408                                               &cmd->req_flags)) {
1409                                 /* cancel the IO timeout */
1410                                 if (cancel_delayed_work(&io_req->timeout_work))
1411                                         kref_put(&io_req->refcount,
1412                                                  bnx2fc_cmd_release);
1413                                                         /* timer hold */
1414                                 rc = bnx2fc_initiate_abts(cmd);
1415                                 /* abts shouldn't fail in this context */
1416                                 WARN_ON(rc != SUCCESS);
1417                         } else
1418                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1419                                         " progress for this IO 0x%x\n",
1420                                         cmd->xid);
1421                 }
1422         }
1423 }
1424
1425 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1426 {
1427         struct bnx2fc_rport *tgt = io_req->tgt;
1428         struct bnx2fc_cmd *cmd, *tmp;
1429         int rc = 0;
1430
1431         /* called with tgt_lock held */
1432         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1433         /*
1434          * Walk thru the active_ios queue and ABORT the IO
1435          * that matches with the LUN that was reset
1436          */
1437         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1438                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1439                 /* Initiate ABTS */
1440                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1441                                                         &cmd->req_flags)) {
1442                         /* cancel the IO timeout */
1443                         if (cancel_delayed_work(&io_req->timeout_work))
1444                                 kref_put(&io_req->refcount,
1445                                          bnx2fc_cmd_release); /* timer hold */
1446                         rc = bnx2fc_initiate_abts(cmd);
1447                         /* abts shouldn't fail in this context */
1448                         WARN_ON(rc != SUCCESS);
1449
1450                 } else
1451                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1452                                 " for this IO 0x%x\n", cmd->xid);
1453         }
1454 }
1455
1456 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1457                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1458 {
1459         struct bnx2fc_mp_req *tm_req;
1460         struct fc_frame_header *fc_hdr;
1461         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1462         u64 *hdr;
1463         u64 *temp_hdr;
1464         void *rsp_buf;
1465
1466         /* Called with tgt_lock held */
1467         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1468
1469         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1470                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1471         else {
1472                 /* TM has already timed out and we got
1473                  * delayed completion. Ignore completion
1474                  * processing.
1475                  */
1476                 return;
1477         }
1478
1479         tm_req = &(io_req->mp_req);
1480         fc_hdr = &(tm_req->resp_fc_hdr);
1481         hdr = (u64 *)fc_hdr;
1482         temp_hdr = (u64 *)
1483                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1484         hdr[0] = cpu_to_be64(temp_hdr[0]);
1485         hdr[1] = cpu_to_be64(temp_hdr[1]);
1486         hdr[2] = cpu_to_be64(temp_hdr[2]);
1487
1488         tm_req->resp_len =
1489                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1490
1491         rsp_buf = tm_req->resp_buf;
1492
1493         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1494                 bnx2fc_parse_fcp_rsp(io_req,
1495                                      (struct fcoe_fcp_rsp_payload *)
1496                                      rsp_buf, num_rq);
1497                 if (io_req->fcp_rsp_code == 0) {
1498                         /* TM successful */
1499                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1500                                 bnx2fc_lun_reset_cmpl(io_req);
1501                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1502                                 bnx2fc_tgt_reset_cmpl(io_req);
1503                 }
1504         } else {
1505                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1506                         fc_hdr->fh_r_ctl);
1507         }
1508         if (!sc_cmd->SCp.ptr) {
1509                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1510                 return;
1511         }
1512         switch (io_req->fcp_status) {
1513         case FC_GOOD:
1514                 if (io_req->cdb_status == 0) {
1515                         /* Good IO completion */
1516                         sc_cmd->result = DID_OK << 16;
1517                 } else {
1518                         /* Transport status is good, SCSI status not good */
1519                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1520                 }
1521                 if (io_req->fcp_resid)
1522                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1523                 break;
1524
1525         default:
1526                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1527                            io_req->fcp_status);
1528                 break;
1529         }
1530
1531         sc_cmd = io_req->sc_cmd;
1532         io_req->sc_cmd = NULL;
1533
1534         /* check if the io_req exists in tgt's tmf_q */
1535         if (io_req->on_tmf_queue) {
1536
1537                 list_del_init(&io_req->link);
1538                 io_req->on_tmf_queue = 0;
1539         } else {
1540
1541                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1542                 return;
1543         }
1544
1545         sc_cmd->SCp.ptr = NULL;
1546         sc_cmd->scsi_done(sc_cmd);
1547
1548         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1549         if (io_req->wait_for_comp) {
1550                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1551                 complete(&io_req->tm_done);
1552         }
1553 }
1554
1555 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1556                            int bd_index)
1557 {
1558         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1559         int frag_size, sg_frags;
1560
1561         sg_frags = 0;
1562         while (sg_len) {
1563                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1564                         frag_size = BNX2FC_BD_SPLIT_SZ;
1565                 else
1566                         frag_size = sg_len;
1567                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1568                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1569                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1570                 bd[bd_index + sg_frags].flags = 0;
1571
1572                 addr += (u64) frag_size;
1573                 sg_frags++;
1574                 sg_len -= frag_size;
1575         }
1576         return sg_frags;
1577
1578 }
1579
1580 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1581 {
1582         struct bnx2fc_interface *interface = io_req->port->priv;
1583         struct bnx2fc_hba *hba = interface->hba;
1584         struct scsi_cmnd *sc = io_req->sc_cmd;
1585         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1586         struct scatterlist *sg;
1587         int byte_count = 0;
1588         int sg_count = 0;
1589         int bd_count = 0;
1590         int sg_frags;
1591         unsigned int sg_len;
1592         u64 addr;
1593         int i;
1594
1595         /*
1596          * Use dma_map_sg directly to ensure we're using the correct
1597          * dev struct off of pcidev.
1598          */
1599         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1600                               scsi_sg_count(sc), sc->sc_data_direction);
1601         scsi_for_each_sg(sc, sg, sg_count, i) {
1602                 sg_len = sg_dma_len(sg);
1603                 addr = sg_dma_address(sg);
1604                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1605                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1606                                                    bd_count);
1607                 } else {
1608
1609                         sg_frags = 1;
1610                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1611                         bd[bd_count].buf_addr_hi  = addr >> 32;
1612                         bd[bd_count].buf_len = (u16)sg_len;
1613                         bd[bd_count].flags = 0;
1614                 }
1615                 bd_count += sg_frags;
1616                 byte_count += sg_len;
1617         }
1618         if (byte_count != scsi_bufflen(sc))
1619                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1620                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1621                         io_req->xid);
1622         return bd_count;
1623 }
1624
1625 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1626 {
1627         struct scsi_cmnd *sc = io_req->sc_cmd;
1628         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1629         int bd_count;
1630
1631         if (scsi_sg_count(sc)) {
1632                 bd_count = bnx2fc_map_sg(io_req);
1633                 if (bd_count == 0)
1634                         return -ENOMEM;
1635         } else {
1636                 bd_count = 0;
1637                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1638                 bd[0].buf_len = bd[0].flags = 0;
1639         }
1640         io_req->bd_tbl->bd_valid = bd_count;
1641
1642         return 0;
1643 }
1644
1645 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1646 {
1647         struct scsi_cmnd *sc = io_req->sc_cmd;
1648         struct bnx2fc_interface *interface = io_req->port->priv;
1649         struct bnx2fc_hba *hba = interface->hba;
1650
1651         /*
1652          * Use dma_unmap_sg directly to ensure we're using the correct
1653          * dev struct off of pcidev.
1654          */
1655         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1656                 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1657                     scsi_sg_count(sc), sc->sc_data_direction);
1658                 io_req->bd_tbl->bd_valid = 0;
1659         }
1660 }
1661
1662 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1663                                   struct fcp_cmnd *fcp_cmnd)
1664 {
1665         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1666
1667         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1668
1669         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1670
1671         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1672         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1673
1674         fcp_cmnd->fc_cmdref = 0;
1675         fcp_cmnd->fc_pri_ta = 0;
1676         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1677         fcp_cmnd->fc_flags = io_req->io_req_flags;
1678         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1679 }
1680
1681 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1682                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1683                                  u8 num_rq)
1684 {
1685         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1686         struct bnx2fc_rport *tgt = io_req->tgt;
1687         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1688         u32 rq_buff_len = 0;
1689         int i;
1690         unsigned char *rq_data;
1691         unsigned char *dummy;
1692         int fcp_sns_len = 0;
1693         int fcp_rsp_len = 0;
1694
1695         io_req->fcp_status = FC_GOOD;
1696         io_req->fcp_resid = 0;
1697         if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1698             FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1699                 io_req->fcp_resid = fcp_rsp->fcp_resid;
1700
1701         io_req->scsi_comp_flags = rsp_flags;
1702         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1703                                 fcp_rsp->scsi_status_code;
1704
1705         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1706         if (num_rq) {
1707
1708                 /*
1709                  * We do not anticipate num_rq >1, as the linux defined
1710                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1711                  * 256 bytes of single rq buffer is good enough to hold this.
1712                  */
1713
1714                 if (rsp_flags &
1715                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1716                         fcp_rsp_len = rq_buff_len
1717                                         = fcp_rsp->fcp_rsp_len;
1718                 }
1719
1720                 if (rsp_flags &
1721                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1722                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1723                         rq_buff_len += fcp_rsp->fcp_sns_len;
1724                 }
1725
1726                 io_req->fcp_rsp_len = fcp_rsp_len;
1727                 io_req->fcp_sns_len = fcp_sns_len;
1728
1729                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1730                         /* Invalid sense sense length. */
1731                         printk(KERN_ERR PFX "invalid sns length %d\n",
1732                                 rq_buff_len);
1733                         /* reset rq_buff_len */
1734                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1735                 }
1736
1737                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1738
1739                 if (num_rq > 1) {
1740                         /* We do not need extra sense data */
1741                         for (i = 1; i < num_rq; i++)
1742                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1743                 }
1744
1745                 /* fetch fcp_rsp_code */
1746                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1747                         /* Only for task management function */
1748                         io_req->fcp_rsp_code = rq_data[3];
1749                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1750                                 io_req->fcp_rsp_code);
1751                 }
1752
1753                 /* fetch sense data */
1754                 rq_data += fcp_rsp_len;
1755
1756                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1757                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1758                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1759                 }
1760
1761                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1762                 if (fcp_sns_len)
1763                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1764
1765                 /* return RQ entries */
1766                 for (i = 0; i < num_rq; i++)
1767                         bnx2fc_return_rqe(tgt, 1);
1768         }
1769 }
1770
1771 /**
1772  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1773  *
1774  * @host:       The Scsi_Host the command was issued to
1775  * @sc_cmd:     struct scsi_cmnd to be executed
1776  *
1777  * This is the IO strategy routine, called by SCSI-ML
1778  **/
1779 int bnx2fc_queuecommand(struct Scsi_Host *host,
1780                         struct scsi_cmnd *sc_cmd)
1781 {
1782         struct fc_lport *lport = shost_priv(host);
1783         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1784         struct fc_rport_libfc_priv *rp = rport->dd_data;
1785         struct bnx2fc_rport *tgt;
1786         struct bnx2fc_cmd *io_req;
1787         int rc = 0;
1788         int rval;
1789
1790         rval = fc_remote_port_chkready(rport);
1791         if (rval) {
1792                 sc_cmd->result = rval;
1793                 sc_cmd->scsi_done(sc_cmd);
1794                 return 0;
1795         }
1796
1797         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1798                 rc = SCSI_MLQUEUE_HOST_BUSY;
1799                 goto exit_qcmd;
1800         }
1801
1802         /* rport and tgt are allocated together, so tgt should be non-NULL */
1803         tgt = (struct bnx2fc_rport *)&rp[1];
1804
1805         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1806                 /*
1807                  * Session is not offloaded yet. Let SCSI-ml retry
1808                  * the command.
1809                  */
1810                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1811                 goto exit_qcmd;
1812         }
1813         if (tgt->retry_delay_timestamp) {
1814                 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1815                         tgt->retry_delay_timestamp = 0;
1816                 } else {
1817                         /* If retry_delay timer is active, flow off the ML */
1818                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1819                         goto exit_qcmd;
1820                 }
1821         }
1822
1823         spin_lock_bh(&tgt->tgt_lock);
1824
1825         io_req = bnx2fc_cmd_alloc(tgt);
1826         if (!io_req) {
1827                 rc = SCSI_MLQUEUE_HOST_BUSY;
1828                 goto exit_qcmd_tgtlock;
1829         }
1830         io_req->sc_cmd = sc_cmd;
1831
1832         if (bnx2fc_post_io_req(tgt, io_req)) {
1833                 printk(KERN_ERR PFX "Unable to post io_req\n");
1834                 rc = SCSI_MLQUEUE_HOST_BUSY;
1835                 goto exit_qcmd_tgtlock;
1836         }
1837
1838 exit_qcmd_tgtlock:
1839         spin_unlock_bh(&tgt->tgt_lock);
1840 exit_qcmd:
1841         return rc;
1842 }
1843
1844 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1845                                    struct fcoe_task_ctx_entry *task,
1846                                    u8 num_rq)
1847 {
1848         struct fcoe_fcp_rsp_payload *fcp_rsp;
1849         struct bnx2fc_rport *tgt = io_req->tgt;
1850         struct scsi_cmnd *sc_cmd;
1851         struct Scsi_Host *host;
1852
1853
1854         /* scsi_cmd_cmpl is called with tgt lock held */
1855
1856         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1857                 /* we will not receive ABTS response for this IO */
1858                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1859                            "this scsi cmd\n");
1860         }
1861
1862         /* Cancel the timeout_work, as we received IO completion */
1863         if (cancel_delayed_work(&io_req->timeout_work))
1864                 kref_put(&io_req->refcount,
1865                          bnx2fc_cmd_release); /* drop timer hold */
1866
1867         sc_cmd = io_req->sc_cmd;
1868         if (sc_cmd == NULL) {
1869                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1870                 return;
1871         }
1872
1873         /* Fetch fcp_rsp from task context and perform cmd completion */
1874         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1875                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1876
1877         /* parse fcp_rsp and obtain sense data from RQ if available */
1878         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1879
1880         host = sc_cmd->device->host;
1881         if (!sc_cmd->SCp.ptr) {
1882                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1883                 return;
1884         }
1885
1886         if (io_req->on_active_queue) {
1887                 list_del_init(&io_req->link);
1888                 io_req->on_active_queue = 0;
1889                 /* Move IO req to retire queue */
1890                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1891         } else {
1892                 /* This should not happen, but could have been pulled
1893                  * by bnx2fc_flush_active_ios(), or during a race
1894                  * between command abort and (late) completion.
1895                  */
1896                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1897                 if (io_req->wait_for_comp)
1898                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1899                                                &io_req->req_flags))
1900                                 complete(&io_req->tm_done);
1901         }
1902
1903         bnx2fc_unmap_sg_list(io_req);
1904         io_req->sc_cmd = NULL;
1905
1906         switch (io_req->fcp_status) {
1907         case FC_GOOD:
1908                 if (io_req->cdb_status == 0) {
1909                         /* Good IO completion */
1910                         sc_cmd->result = DID_OK << 16;
1911                 } else {
1912                         /* Transport status is good, SCSI status not good */
1913                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1914                                  " fcp_resid = 0x%x\n",
1915                                 io_req->cdb_status, io_req->fcp_resid);
1916                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1917
1918                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1919                             io_req->cdb_status == SAM_STAT_BUSY) {
1920                                 /* Set the jiffies + retry_delay_timer * 100ms
1921                                    for the rport/tgt */
1922                                 tgt->retry_delay_timestamp = jiffies +
1923                                         fcp_rsp->retry_delay_timer * HZ / 10;
1924                         }
1925
1926                 }
1927                 if (io_req->fcp_resid)
1928                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1929                 break;
1930         default:
1931                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1932                         io_req->fcp_status);
1933                 break;
1934         }
1935         sc_cmd->SCp.ptr = NULL;
1936         sc_cmd->scsi_done(sc_cmd);
1937         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1938 }
1939
1940 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1941                                struct bnx2fc_cmd *io_req)
1942 {
1943         struct fcoe_task_ctx_entry *task;
1944         struct fcoe_task_ctx_entry *task_page;
1945         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1946         struct fcoe_port *port = tgt->port;
1947         struct bnx2fc_interface *interface = port->priv;
1948         struct bnx2fc_hba *hba = interface->hba;
1949         struct fc_lport *lport = port->lport;
1950         struct fc_stats *stats;
1951         int task_idx, index;
1952         u16 xid;
1953
1954         /* bnx2fc_post_io_req() is called with the tgt_lock held */
1955
1956         /* Initialize rest of io_req fields */
1957         io_req->cmd_type = BNX2FC_SCSI_CMD;
1958         io_req->port = port;
1959         io_req->tgt = tgt;
1960         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1961         sc_cmd->SCp.ptr = (char *)io_req;
1962
1963         stats = per_cpu_ptr(lport->stats, get_cpu());
1964         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1965                 io_req->io_req_flags = BNX2FC_READ;
1966                 stats->InputRequests++;
1967                 stats->InputBytes += io_req->data_xfer_len;
1968         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1969                 io_req->io_req_flags = BNX2FC_WRITE;
1970                 stats->OutputRequests++;
1971                 stats->OutputBytes += io_req->data_xfer_len;
1972         } else {
1973                 io_req->io_req_flags = 0;
1974                 stats->ControlRequests++;
1975         }
1976         put_cpu();
1977
1978         xid = io_req->xid;
1979
1980         /* Build buffer descriptor list for firmware from sg list */
1981         if (bnx2fc_build_bd_list_from_sg(io_req)) {
1982                 printk(KERN_ERR PFX "BD list creation failed\n");
1983                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1984                 return -EAGAIN;
1985         }
1986
1987         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
1988         index = xid % BNX2FC_TASKS_PER_PAGE;
1989
1990         /* Initialize task context for this IO request */
1991         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
1992         task = &(task_page[index]);
1993         bnx2fc_init_task(io_req, task);
1994
1995         if (tgt->flush_in_prog) {
1996                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
1997                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1998                 return -EAGAIN;
1999         }
2000
2001         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2002                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2003                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2004                 return -EAGAIN;
2005         }
2006
2007         /* Time IO req */
2008         if (tgt->io_timeout)
2009                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2010         /* Obtain free SQ entry */
2011         bnx2fc_add_2_sq(tgt, xid);
2012
2013         /* Enqueue the io_req to active_cmd_queue */
2014
2015         io_req->on_active_queue = 1;
2016         /* move io_req from pending_queue to active_queue */
2017         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2018
2019         /* Ring doorbell */
2020         bnx2fc_ring_doorbell(tgt);
2021         return 0;
2022 }