Pileus Git - ~andy/linux/blob - drivers/scsi/bnx2fc/bnx2fc_io.c

   1 /* bnx2fc_io.c: Broadcom NetXtreme II Linux FCoE offload driver.
   2  * IO manager and SCSI IO processing.
   3  *
   4  * Copyright (c) 2008 - 2013 Broadcom Corporation
   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: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  11  */
  12
  13 #include "bnx2fc.h"
  14
  15 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  16
  17 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  18                            int bd_index);
  19 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  20 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  21 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  22 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  23 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  24                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
  25                                  u8 num_rq);
  26
  27 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  28                           unsigned int timer_msec)
  29 {
  30         struct bnx2fc_interface *interface = io_req->port->priv;
  31
  32         if (queue_delayed_work(interface->timer_work_queue,
  33                                &io_req->timeout_work,
  34                                msecs_to_jiffies(timer_msec)))
  35                 kref_get(&io_req->refcount);
  36 }
  37
  38 static void bnx2fc_cmd_timeout(struct work_struct *work)
  39 {
  40         struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  41                                                  timeout_work.work);
  42         struct fc_lport *lport;
  43         struct fc_rport_priv *rdata;
  44         u8 cmd_type = io_req->cmd_type;
  45         struct bnx2fc_rport *tgt = io_req->tgt;
  46         int logo_issued;
  47         int rc;
  48
  49         BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  50                       "req_flags = %lx\n", cmd_type, io_req->req_flags);
  51
  52         spin_lock_bh(&tgt->tgt_lock);
  53         if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  54                 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  55                 /*
  56                  * ideally we should hold the io_req until RRQ complets,
  57                  * and release io_req from timeout hold.
  58                  */
  59                 spin_unlock_bh(&tgt->tgt_lock);
  60                 bnx2fc_send_rrq(io_req);
  61                 return;
  62         }
  63         if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  64                 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
  65                 goto done;
  66         }
  67
  68         switch (cmd_type) {
  69         case BNX2FC_SCSI_CMD:
  70                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  71                                                         &io_req->req_flags)) {
  72                         /* Handle eh_abort timeout */
  73                         BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
  74                         complete(&io_req->tm_done);
  75                 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  76                                     &io_req->req_flags)) {
  77                         /* Handle internally generated ABTS timeout */
  78                         BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
  79                                         io_req->refcount.refcount.counter);
  80                         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  81                                                &io_req->req_flags))) {
  82
  83                                 lport = io_req->port->lport;
  84                                 rdata = io_req->tgt->rdata;
  85                                 logo_issued = test_and_set_bit(
  86                                                 BNX2FC_FLAG_EXPL_LOGO,
  87                                                 &tgt->flags);
  88                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
  89                                 spin_unlock_bh(&tgt->tgt_lock);
  90
  91                                 /* Explicitly logo the target */
  92                                 if (!logo_issued) {
  93                                         BNX2FC_IO_DBG(io_req, "Explicit "
  94                                                    "logo - tgt flags = 0x%lx\n",
  95                                                    tgt->flags);
  96
  97                                         mutex_lock(&lport->disc.disc_mutex);
  98                                         lport->tt.rport_logoff(rdata);
  99                                         mutex_unlock(&lport->disc.disc_mutex);
 100                                 }
 101                                 return;
 102                         }
 103                 } else {
 104                         /* Hanlde IO timeout */
 105                         BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
 106                         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
 107                                              &io_req->req_flags)) {
 108                                 BNX2FC_IO_DBG(io_req, "IO completed before "
 109                                                            " timer expiry\n");
 110                                 goto done;
 111                         }
 112
 113                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
 114                                               &io_req->req_flags)) {
 115                                 rc = bnx2fc_initiate_abts(io_req);
 116                                 if (rc == SUCCESS)
 117                                         goto done;
 118                                 /*
 119                                  * Explicitly logo the target if
 120                                  * abts initiation fails
 121                                  */
 122                                 lport = io_req->port->lport;
 123                                 rdata = io_req->tgt->rdata;
 124                                 logo_issued = test_and_set_bit(
 125                                                 BNX2FC_FLAG_EXPL_LOGO,
 126                                                 &tgt->flags);
 127                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 128                                 spin_unlock_bh(&tgt->tgt_lock);
 129
 130                                 if (!logo_issued) {
 131                                         BNX2FC_IO_DBG(io_req, "Explicit "
 132                                                    "logo - tgt flags = 0x%lx\n",
 133                                                    tgt->flags);
 134
 135
 136                                         mutex_lock(&lport->disc.disc_mutex);
 137                                         lport->tt.rport_logoff(rdata);
 138                                         mutex_unlock(&lport->disc.disc_mutex);
 139                                 }
 140                                 return;
 141                         } else {
 142                                 BNX2FC_IO_DBG(io_req, "IO already in "
 143                                                       "ABTS processing\n");
 144                         }
 145                 }
 146                 break;
 147         case BNX2FC_ELS:
 148
 149                 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
 150                         BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
 151
 152                         if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
 153                                               &io_req->req_flags)) {
 154                                 lport = io_req->port->lport;
 155                                 rdata = io_req->tgt->rdata;
 156                                 logo_issued = test_and_set_bit(
 157                                                 BNX2FC_FLAG_EXPL_LOGO,
 158                                                 &tgt->flags);
 159                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 160                                 spin_unlock_bh(&tgt->tgt_lock);
 161
 162                                 /* Explicitly logo the target */
 163                                 if (!logo_issued) {
 164                                         BNX2FC_IO_DBG(io_req, "Explicitly logo"
 165                                                    "(els)\n");
 166                                         mutex_lock(&lport->disc.disc_mutex);
 167                                         lport->tt.rport_logoff(rdata);
 168                                         mutex_unlock(&lport->disc.disc_mutex);
 169                                 }
 170                                 return;
 171                         }
 172                 } else {
 173                         /*
 174                          * Handle ELS timeout.
 175                          * tgt_lock is used to sync compl path and timeout
 176                          * path. If els compl path is processing this IO, we
 177                          * have nothing to do here, just release the timer hold
 178                          */
 179                         BNX2FC_IO_DBG(io_req, "ELS timed out\n");
 180                         if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
 181                                                &io_req->req_flags))
 182                                 goto done;
 183
 184                         /* Indicate the cb_func that this ELS is timed out */
 185                         set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
 186
 187                         if ((io_req->cb_func) && (io_req->cb_arg)) {
 188                                 io_req->cb_func(io_req->cb_arg);
 189                                 io_req->cb_arg = NULL;
 190                         }
 191                 }
 192                 break;
 193         default:
 194                 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
 195                         cmd_type);
 196                 break;
 197         }
 198
 199 done:
 200         /* release the cmd that was held when timer was set */
 201         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 202         spin_unlock_bh(&tgt->tgt_lock);
 203 }
 204
 205 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
 206 {
 207         /* Called with host lock held */
 208         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 209
 210         /*
 211          * active_cmd_queue may have other command types as well,
 212          * and during flush operation,  we want to error back only
 213          * scsi commands.
 214          */
 215         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 216                 return;
 217
 218         BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
 219         if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
 220                 /* Do not call scsi done for this IO */
 221                 return;
 222         }
 223
 224         bnx2fc_unmap_sg_list(io_req);
 225         io_req->sc_cmd = NULL;
 226         if (!sc_cmd) {
 227                 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
 228                                     "IO(0x%x) already cleaned up\n",
 229                        io_req->xid);
 230                 return;
 231         }
 232         sc_cmd->result = err_code << 16;
 233
 234         BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
 235                 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
 236                 sc_cmd->allowed);
 237         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
 238         sc_cmd->SCp.ptr = NULL;
 239         sc_cmd->scsi_done(sc_cmd);
 240 }
 241
 242 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 243 {
 244         struct bnx2fc_cmd_mgr *cmgr;
 245         struct io_bdt *bdt_info;
 246         struct bnx2fc_cmd *io_req;
 247         size_t len;
 248         u32 mem_size;
 249         u16 xid;
 250         int i;
 251         int num_ios, num_pri_ios;
 252         size_t bd_tbl_sz;
 253         int arr_sz = num_possible_cpus() + 1;
 254         u16 min_xid = BNX2FC_MIN_XID;
 255         u16 max_xid = hba->max_xid;
 256
 257         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 258                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 259                                         and max_xid 0x%x\n", min_xid, max_xid);
 260                 return NULL;
 261         }
 262         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 263
 264         num_ios = max_xid - min_xid + 1;
 265         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 266         len += sizeof(struct bnx2fc_cmd_mgr);
 267
 268         cmgr = kzalloc(len, GFP_KERNEL);
 269         if (!cmgr) {
 270                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
 271                 return NULL;
 272         }
 273
 274         cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
 275                                   arr_sz, GFP_KERNEL);
 276         if (!cmgr->free_list) {
 277                 printk(KERN_ERR PFX "failed to alloc free_list\n");
 278                 goto mem_err;
 279         }
 280
 281         cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
 282                                        arr_sz, GFP_KERNEL);
 283         if (!cmgr->free_list_lock) {
 284                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 285                 goto mem_err;
 286         }
 287
 288         cmgr->hba = hba;
 289         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 290
 291         for (i = 0; i < arr_sz; i++)  {
 292                 INIT_LIST_HEAD(&cmgr->free_list[i]);
 293                 spin_lock_init(&cmgr->free_list_lock[i]);
 294         }
 295
 296         /*
 297          * Pre-allocated pool of bnx2fc_cmds.
 298          * Last entry in the free list array is the free list
 299          * of slow path requests.
 300          */
 301         xid = BNX2FC_MIN_XID;
 302         num_pri_ios = num_ios - hba->elstm_xids;
 303         for (i = 0; i < num_ios; i++) {
 304                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 305
 306                 if (!io_req) {
 307                         printk(KERN_ERR PFX "failed to alloc io_req\n");
 308                         goto mem_err;
 309                 }
 310
 311                 INIT_LIST_HEAD(&io_req->link);
 312                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 313
 314                 io_req->xid = xid++;
 315                 if (i < num_pri_ios)
 316                         list_add_tail(&io_req->link,
 317                                 &cmgr->free_list[io_req->xid %
 318                                                  num_possible_cpus()]);
 319                 else
 320                         list_add_tail(&io_req->link,
 321                                 &cmgr->free_list[num_possible_cpus()]);
 322                 io_req++;
 323         }
 324
 325         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 326         mem_size = num_ios * sizeof(struct io_bdt *);
 327         cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
 328         if (!cmgr->io_bdt_pool) {
 329                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 330                 goto mem_err;
 331         }
 332
 333         mem_size = sizeof(struct io_bdt);
 334         for (i = 0; i < num_ios; i++) {
 335                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 336                 if (!cmgr->io_bdt_pool[i]) {
 337                         printk(KERN_ERR PFX "failed to alloc "
 338                                 "io_bdt_pool[%d]\n", i);
 339                         goto mem_err;
 340                 }
 341         }
 342
 343         /* Allocate an map fcoe_bdt_ctx structures */
 344         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 345         for (i = 0; i < num_ios; i++) {
 346                 bdt_info = cmgr->io_bdt_pool[i];
 347                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 348                                                       bd_tbl_sz,
 349                                                       &bdt_info->bd_tbl_dma,
 350                                                       GFP_KERNEL);
 351                 if (!bdt_info->bd_tbl) {
 352                         printk(KERN_ERR PFX "failed to alloc "
 353                                 "bdt_tbl[%d]\n", i);
 354                         goto mem_err;
 355                 }
 356         }
 357
 358         return cmgr;
 359
 360 mem_err:
 361         bnx2fc_cmd_mgr_free(cmgr);
 362         return NULL;
 363 }
 364
 365 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 366 {
 367         struct io_bdt *bdt_info;
 368         struct bnx2fc_hba *hba = cmgr->hba;
 369         size_t bd_tbl_sz;
 370         u16 min_xid = BNX2FC_MIN_XID;
 371         u16 max_xid = hba->max_xid;
 372         int num_ios;
 373         int i;
 374
 375         num_ios = max_xid - min_xid + 1;
 376
 377         /* Free fcoe_bdt_ctx structures */
 378         if (!cmgr->io_bdt_pool)
 379                 goto free_cmd_pool;
 380
 381         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 382         for (i = 0; i < num_ios; i++) {
 383                 bdt_info = cmgr->io_bdt_pool[i];
 384                 if (bdt_info->bd_tbl) {
 385                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 386                                             bdt_info->bd_tbl,
 387                                             bdt_info->bd_tbl_dma);
 388                         bdt_info->bd_tbl = NULL;
 389                 }
 390         }
 391
 392         /* Destroy io_bdt pool */
 393         for (i = 0; i < num_ios; i++) {
 394                 kfree(cmgr->io_bdt_pool[i]);
 395                 cmgr->io_bdt_pool[i] = NULL;
 396         }
 397
 398         kfree(cmgr->io_bdt_pool);
 399         cmgr->io_bdt_pool = NULL;
 400
 401 free_cmd_pool:
 402         kfree(cmgr->free_list_lock);
 403
 404         /* Destroy cmd pool */
 405         if (!cmgr->free_list)
 406                 goto free_cmgr;
 407
 408         for (i = 0; i < num_possible_cpus() + 1; i++)  {
 409                 struct bnx2fc_cmd *tmp, *io_req;
 410
 411                 list_for_each_entry_safe(io_req, tmp,
 412                                          &cmgr->free_list[i], link) {
 413                         list_del(&io_req->link);
 414                         kfree(io_req);
 415                 }
 416         }
 417         kfree(cmgr->free_list);
 418 free_cmgr:
 419         /* Free command manager itself */
 420         kfree(cmgr);
 421 }
 422
 423 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 424 {
 425         struct fcoe_port *port = tgt->port;
 426         struct bnx2fc_interface *interface = port->priv;
 427         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 428         struct bnx2fc_cmd *io_req;
 429         struct list_head *listp;
 430         struct io_bdt *bd_tbl;
 431         int index = RESERVE_FREE_LIST_INDEX;
 432         u32 free_sqes;
 433         u32 max_sqes;
 434         u16 xid;
 435
 436         max_sqes = tgt->max_sqes;
 437         switch (type) {
 438         case BNX2FC_TASK_MGMT_CMD:
 439                 max_sqes = BNX2FC_TM_MAX_SQES;
 440                 break;
 441         case BNX2FC_ELS:
 442                 max_sqes = BNX2FC_ELS_MAX_SQES;
 443                 break;
 444         default:
 445                 break;
 446         }
 447
 448         /*
 449          * NOTE: Free list insertions and deletions are protected with
 450          * cmgr lock
 451          */
 452         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 453         free_sqes = atomic_read(&tgt->free_sqes);
 454         if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 455             (tgt->num_active_ios.counter  >= max_sqes) ||
 456             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 457                 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 458                         "ios(%d):sqes(%d)\n",
 459                         tgt->num_active_ios.counter, tgt->max_sqes);
 460                 if (list_empty(&(cmd_mgr->free_list[index])))
 461                         printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 462                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 463                 return NULL;
 464         }
 465
 466         listp = (struct list_head *)
 467                         cmd_mgr->free_list[index].next;
 468         list_del_init(listp);
 469         io_req = (struct bnx2fc_cmd *) listp;
 470         xid = io_req->xid;
 471         cmd_mgr->cmds[xid] = io_req;
 472         atomic_inc(&tgt->num_active_ios);
 473         atomic_dec(&tgt->free_sqes);
 474         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 475
 476         INIT_LIST_HEAD(&io_req->link);
 477
 478         io_req->port = port;
 479         io_req->cmd_mgr = cmd_mgr;
 480         io_req->req_flags = 0;
 481         io_req->cmd_type = type;
 482
 483         /* Bind io_bdt for this io_req */
 484         /* Have a static link between io_req and io_bdt_pool */
 485         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 486         bd_tbl->io_req = io_req;
 487
 488         /* Hold the io_req  against deletion */
 489         kref_init(&io_req->refcount);
 490         return io_req;
 491 }
 492
 493 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 494 {
 495         struct fcoe_port *port = tgt->port;
 496         struct bnx2fc_interface *interface = port->priv;
 497         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 498         struct bnx2fc_cmd *io_req;
 499         struct list_head *listp;
 500         struct io_bdt *bd_tbl;
 501         u32 free_sqes;
 502         u32 max_sqes;
 503         u16 xid;
 504         int index = get_cpu();
 505
 506         max_sqes = BNX2FC_SCSI_MAX_SQES;
 507         /*
 508          * NOTE: Free list insertions and deletions are protected with
 509          * cmgr lock
 510          */
 511         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 512         free_sqes = atomic_read(&tgt->free_sqes);
 513         if ((list_empty(&cmd_mgr->free_list[index])) ||
 514             (tgt->num_active_ios.counter  >= max_sqes) ||
 515             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 516                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 517                 put_cpu();
 518                 return NULL;
 519         }
 520
 521         listp = (struct list_head *)
 522                 cmd_mgr->free_list[index].next;
 523         list_del_init(listp);
 524         io_req = (struct bnx2fc_cmd *) listp;
 525         xid = io_req->xid;
 526         cmd_mgr->cmds[xid] = io_req;
 527         atomic_inc(&tgt->num_active_ios);
 528         atomic_dec(&tgt->free_sqes);
 529         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 530         put_cpu();
 531
 532         INIT_LIST_HEAD(&io_req->link);
 533
 534         io_req->port = port;
 535         io_req->cmd_mgr = cmd_mgr;
 536         io_req->req_flags = 0;
 537
 538         /* Bind io_bdt for this io_req */
 539         /* Have a static link between io_req and io_bdt_pool */
 540         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 541         bd_tbl->io_req = io_req;
 542
 543         /* Hold the io_req  against deletion */
 544         kref_init(&io_req->refcount);
 545         return io_req;
 546 }
 547
 548 void bnx2fc_cmd_release(struct kref *ref)
 549 {
 550         struct bnx2fc_cmd *io_req = container_of(ref,
 551                                                 struct bnx2fc_cmd, refcount);
 552         struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 553         int index;
 554
 555         if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 556                 index = io_req->xid % num_possible_cpus();
 557         else
 558                 index = RESERVE_FREE_LIST_INDEX;
 559
 560
 561         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 562         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 563                 bnx2fc_free_mp_resc(io_req);
 564         cmd_mgr->cmds[io_req->xid] = NULL;
 565         /* Delete IO from retire queue */
 566         list_del_init(&io_req->link);
 567         /* Add it to the free list */
 568         list_add(&io_req->link,
 569                         &cmd_mgr->free_list[index]);
 570         atomic_dec(&io_req->tgt->num_active_ios);
 571         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 572
 573 }
 574
 575 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 576 {
 577         struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 578         struct bnx2fc_interface *interface = io_req->port->priv;
 579         struct bnx2fc_hba *hba = interface->hba;
 580         size_t sz = sizeof(struct fcoe_bd_ctx);
 581
 582         /* clear tm flags */
 583         mp_req->tm_flags = 0;
 584         if (mp_req->mp_req_bd) {
 585                 dma_free_coherent(&hba->pcidev->dev, sz,
 586                                      mp_req->mp_req_bd,
 587                                      mp_req->mp_req_bd_dma);
 588                 mp_req->mp_req_bd = NULL;
 589         }
 590         if (mp_req->mp_resp_bd) {
 591                 dma_free_coherent(&hba->pcidev->dev, sz,
 592                                      mp_req->mp_resp_bd,
 593                                      mp_req->mp_resp_bd_dma);
 594                 mp_req->mp_resp_bd = NULL;
 595         }
 596         if (mp_req->req_buf) {
 597                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 598                                      mp_req->req_buf,
 599                                      mp_req->req_buf_dma);
 600                 mp_req->req_buf = NULL;
 601         }
 602         if (mp_req->resp_buf) {
 603                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 604                                      mp_req->resp_buf,
 605                                      mp_req->resp_buf_dma);
 606                 mp_req->resp_buf = NULL;
 607         }
 608 }
 609
 610 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 611 {
 612         struct bnx2fc_mp_req *mp_req;
 613         struct fcoe_bd_ctx *mp_req_bd;
 614         struct fcoe_bd_ctx *mp_resp_bd;
 615         struct bnx2fc_interface *interface = io_req->port->priv;
 616         struct bnx2fc_hba *hba = interface->hba;
 617         dma_addr_t addr;
 618         size_t sz;
 619
 620         mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 621         memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 622
 623         mp_req->req_len = sizeof(struct fcp_cmnd);
 624         io_req->data_xfer_len = mp_req->req_len;
 625         mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 626                                              &mp_req->req_buf_dma,
 627                                              GFP_ATOMIC);
 628         if (!mp_req->req_buf) {
 629                 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 630                 bnx2fc_free_mp_resc(io_req);
 631                 return FAILED;
 632         }
 633
 634         mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 635                                               &mp_req->resp_buf_dma,
 636                                               GFP_ATOMIC);
 637         if (!mp_req->resp_buf) {
 638                 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 639                 bnx2fc_free_mp_resc(io_req);
 640                 return FAILED;
 641         }
 642         memset(mp_req->req_buf, 0, PAGE_SIZE);
 643         memset(mp_req->resp_buf, 0, PAGE_SIZE);
 644
 645         /* Allocate and map mp_req_bd and mp_resp_bd */
 646         sz = sizeof(struct fcoe_bd_ctx);
 647         mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 648                                                  &mp_req->mp_req_bd_dma,
 649                                                  GFP_ATOMIC);
 650         if (!mp_req->mp_req_bd) {
 651                 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 652                 bnx2fc_free_mp_resc(io_req);
 653                 return FAILED;
 654         }
 655         mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 656                                                  &mp_req->mp_resp_bd_dma,
 657                                                  GFP_ATOMIC);
 658         if (!mp_req->mp_resp_bd) {
 659                 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 660                 bnx2fc_free_mp_resc(io_req);
 661                 return FAILED;
 662         }
 663         /* Fill bd table */
 664         addr = mp_req->req_buf_dma;
 665         mp_req_bd = mp_req->mp_req_bd;
 666         mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 667         mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 668         mp_req_bd->buf_len = PAGE_SIZE;
 669         mp_req_bd->flags = 0;
 670
 671         /*
 672          * MP buffer is either a task mgmt command or an ELS.
 673          * So the assumption is that it consumes a single bd
 674          * entry in the bd table
 675          */
 676         mp_resp_bd = mp_req->mp_resp_bd;
 677         addr = mp_req->resp_buf_dma;
 678         mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 679         mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 680         mp_resp_bd->buf_len = PAGE_SIZE;
 681         mp_resp_bd->flags = 0;
 682
 683         return SUCCESS;
 684 }
 685
 686 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 687 {
 688         struct fc_lport *lport;
 689         struct fc_rport *rport;
 690         struct fc_rport_libfc_priv *rp;
 691         struct fcoe_port *port;
 692         struct bnx2fc_interface *interface;
 693         struct bnx2fc_rport *tgt;
 694         struct bnx2fc_cmd *io_req;
 695         struct bnx2fc_mp_req *tm_req;
 696         struct fcoe_task_ctx_entry *task;
 697         struct fcoe_task_ctx_entry *task_page;
 698         struct Scsi_Host *host = sc_cmd->device->host;
 699         struct fc_frame_header *fc_hdr;
 700         struct fcp_cmnd *fcp_cmnd;
 701         int task_idx, index;
 702         int rc = SUCCESS;
 703         u16 xid;
 704         u32 sid, did;
 705         unsigned long start = jiffies;
 706
 707         lport = shost_priv(host);
 708         rport = starget_to_rport(scsi_target(sc_cmd->device));
 709         port = lport_priv(lport);
 710         interface = port->priv;
 711
 712         if (rport == NULL) {
 713                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 714                 rc = FAILED;
 715                 goto tmf_err;
 716         }
 717         rp = rport->dd_data;
 718
 719         rc = fc_block_scsi_eh(sc_cmd);
 720         if (rc)
 721                 return rc;
 722
 723         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 724                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 725                 rc = FAILED;
 726                 goto tmf_err;
 727         }
 728         /* rport and tgt are allocated together, so tgt should be non-NULL */
 729         tgt = (struct bnx2fc_rport *)&rp[1];
 730
 731         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 732                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 733                 rc = FAILED;
 734                 goto tmf_err;
 735         }
 736 retry_tmf:
 737         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 738         if (!io_req) {
 739                 if (time_after(jiffies, start + HZ)) {
 740                         printk(KERN_ERR PFX "tmf: Failed TMF");
 741                         rc = FAILED;
 742                         goto tmf_err;
 743                 }
 744                 msleep(20);
 745                 goto retry_tmf;
 746         }
 747         /* Initialize rest of io_req fields */
 748         io_req->sc_cmd = sc_cmd;
 749         io_req->port = port;
 750         io_req->tgt = tgt;
 751
 752         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 753
 754         rc = bnx2fc_init_mp_req(io_req);
 755         if (rc == FAILED) {
 756                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 757                 spin_lock_bh(&tgt->tgt_lock);
 758                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 759                 spin_unlock_bh(&tgt->tgt_lock);
 760                 goto tmf_err;
 761         }
 762
 763         /* Set TM flags */
 764         io_req->io_req_flags = 0;
 765         tm_req->tm_flags = tm_flags;
 766
 767         /* Fill FCP_CMND */
 768         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 769         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 770         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 771         fcp_cmnd->fc_dl = 0;
 772
 773         /* Fill FC header */
 774         fc_hdr = &(tm_req->req_fc_hdr);
 775         sid = tgt->sid;
 776         did = rport->port_id;
 777         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 778                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 779                            FC_FC_SEQ_INIT, 0);
 780         /* Obtain exchange id */
 781         xid = io_req->xid;
 782
 783         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 784         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 785         index = xid % BNX2FC_TASKS_PER_PAGE;
 786
 787         /* Initialize task context for this IO request */
 788         task_page = (struct fcoe_task_ctx_entry *)
 789                         interface->hba->task_ctx[task_idx];
 790         task = &(task_page[index]);
 791         bnx2fc_init_mp_task(io_req, task);
 792
 793         sc_cmd->SCp.ptr = (char *)io_req;
 794
 795         /* Obtain free SQ entry */
 796         spin_lock_bh(&tgt->tgt_lock);
 797         bnx2fc_add_2_sq(tgt, xid);
 798
 799         /* Enqueue the io_req to active_tm_queue */
 800         io_req->on_tmf_queue = 1;
 801         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 802
 803         init_completion(&io_req->tm_done);
 804         io_req->wait_for_comp = 1;
 805
 806         /* Ring doorbell */
 807         bnx2fc_ring_doorbell(tgt);
 808         spin_unlock_bh(&tgt->tgt_lock);
 809
 810         rc = wait_for_completion_timeout(&io_req->tm_done,
 811                                          BNX2FC_TM_TIMEOUT * HZ);
 812         spin_lock_bh(&tgt->tgt_lock);
 813
 814         io_req->wait_for_comp = 0;
 815         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 816                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 817                 if (io_req->on_tmf_queue) {
 818                         list_del_init(&io_req->link);
 819                         io_req->on_tmf_queue = 0;
 820                 }
 821                 io_req->wait_for_comp = 1;
 822                 bnx2fc_initiate_cleanup(io_req);
 823                 spin_unlock_bh(&tgt->tgt_lock);
 824                 rc = wait_for_completion_timeout(&io_req->tm_done,
 825                                                  BNX2FC_FW_TIMEOUT);
 826                 spin_lock_bh(&tgt->tgt_lock);
 827                 io_req->wait_for_comp = 0;
 828                 if (!rc)
 829                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 830         }
 831
 832         spin_unlock_bh(&tgt->tgt_lock);
 833
 834         if (!rc) {
 835                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 836                 rc = FAILED;
 837         } else {
 838                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 839                 rc = SUCCESS;
 840         }
 841 tmf_err:
 842         return rc;
 843 }
 844
 845 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 846 {
 847         struct fc_lport *lport;
 848         struct bnx2fc_rport *tgt = io_req->tgt;
 849         struct fc_rport *rport = tgt->rport;
 850         struct fc_rport_priv *rdata = tgt->rdata;
 851         struct bnx2fc_interface *interface;
 852         struct fcoe_port *port;
 853         struct bnx2fc_cmd *abts_io_req;
 854         struct fcoe_task_ctx_entry *task;
 855         struct fcoe_task_ctx_entry *task_page;
 856         struct fc_frame_header *fc_hdr;
 857         struct bnx2fc_mp_req *abts_req;
 858         int task_idx, index;
 859         u32 sid, did;
 860         u16 xid;
 861         int rc = SUCCESS;
 862         u32 r_a_tov = rdata->r_a_tov;
 863
 864         /* called with tgt_lock held */
 865         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 866
 867         port = io_req->port;
 868         interface = port->priv;
 869         lport = port->lport;
 870
 871         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 872                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 873                 rc = FAILED;
 874                 goto abts_err;
 875         }
 876
 877         if (rport == NULL) {
 878                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 879                 rc = FAILED;
 880                 goto abts_err;
 881         }
 882
 883         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 884                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 885                 rc = FAILED;
 886                 goto abts_err;
 887         }
 888
 889         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 890         if (!abts_io_req) {
 891                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 892                 rc = FAILED;
 893                 goto abts_err;
 894         }
 895
 896         /* Initialize rest of io_req fields */
 897         abts_io_req->sc_cmd = NULL;
 898         abts_io_req->port = port;
 899         abts_io_req->tgt = tgt;
 900         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 901
 902         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 903         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 904
 905         /* Fill FC header */
 906         fc_hdr = &(abts_req->req_fc_hdr);
 907
 908         /* Obtain oxid and rxid for the original exchange to be aborted */
 909         fc_hdr->fh_ox_id = htons(io_req->xid);
 910         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 911
 912         sid = tgt->sid;
 913         did = rport->port_id;
 914
 915         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 916                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 917                            FC_FC_SEQ_INIT, 0);
 918
 919         xid = abts_io_req->xid;
 920         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 921         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 922         index = xid % BNX2FC_TASKS_PER_PAGE;
 923
 924         /* Initialize task context for this IO request */
 925         task_page = (struct fcoe_task_ctx_entry *)
 926                         interface->hba->task_ctx[task_idx];
 927         task = &(task_page[index]);
 928         bnx2fc_init_mp_task(abts_io_req, task);
 929
 930         /*
 931          * ABTS task is a temporary task that will be cleaned up
 932          * irrespective of ABTS response. We need to start the timer
 933          * for the original exchange, as the CQE is posted for the original
 934          * IO request.
 935          *
 936          * Timer for ABTS is started only when it is originated by a
 937          * TM request. For the ABTS issued as part of ULP timeout,
 938          * scsi-ml maintains the timers.
 939          */
 940
 941         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 942         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 943
 944         /* Obtain free SQ entry */
 945         bnx2fc_add_2_sq(tgt, xid);
 946
 947         /* Ring doorbell */
 948         bnx2fc_ring_doorbell(tgt);
 949
 950 abts_err:
 951         return rc;
 952 }
 953
 954 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 955                                 enum fc_rctl r_ctl)
 956 {
 957         struct fc_lport *lport;
 958         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 959         struct bnx2fc_interface *interface;
 960         struct fcoe_port *port;
 961         struct bnx2fc_cmd *seq_clnp_req;
 962         struct fcoe_task_ctx_entry *task;
 963         struct fcoe_task_ctx_entry *task_page;
 964         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 965         int task_idx, index;
 966         u16 xid;
 967         int rc = 0;
 968
 969         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 970                    orig_io_req->xid);
 971         kref_get(&orig_io_req->refcount);
 972
 973         port = orig_io_req->port;
 974         interface = port->priv;
 975         lport = port->lport;
 976
 977         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 978         if (!cb_arg) {
 979                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 980                 rc = -ENOMEM;
 981                 goto cleanup_err;
 982         }
 983
 984         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 985         if (!seq_clnp_req) {
 986                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 987                 rc = -ENOMEM;
 988                 kfree(cb_arg);
 989                 goto cleanup_err;
 990         }
 991         /* Initialize rest of io_req fields */
 992         seq_clnp_req->sc_cmd = NULL;
 993         seq_clnp_req->port = port;
 994         seq_clnp_req->tgt = tgt;
 995         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 996
 997         xid = seq_clnp_req->xid;
 998
 999         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1000         index = xid % BNX2FC_TASKS_PER_PAGE;
1001
1002         /* Initialize task context for this IO request */
1003         task_page = (struct fcoe_task_ctx_entry *)
1004                      interface->hba->task_ctx[task_idx];
1005         task = &(task_page[index]);
1006         cb_arg->aborted_io_req = orig_io_req;
1007         cb_arg->io_req = seq_clnp_req;
1008         cb_arg->r_ctl = r_ctl;
1009         cb_arg->offset = offset;
1010         seq_clnp_req->cb_arg = cb_arg;
1011
1012         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
1013         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
1014
1015         /* Obtain free SQ entry */
1016         bnx2fc_add_2_sq(tgt, xid);
1017
1018         /* Ring doorbell */
1019         bnx2fc_ring_doorbell(tgt);
1020 cleanup_err:
1021         return rc;
1022 }
1023
1024 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1025 {
1026         struct fc_lport *lport;
1027         struct bnx2fc_rport *tgt = io_req->tgt;
1028         struct bnx2fc_interface *interface;
1029         struct fcoe_port *port;
1030         struct bnx2fc_cmd *cleanup_io_req;
1031         struct fcoe_task_ctx_entry *task;
1032         struct fcoe_task_ctx_entry *task_page;
1033         int task_idx, index;
1034         u16 xid, orig_xid;
1035         int rc = 0;
1036
1037         /* ASSUMPTION: called with tgt_lock held */
1038         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1039
1040         port = io_req->port;
1041         interface = port->priv;
1042         lport = port->lport;
1043
1044         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1045         if (!cleanup_io_req) {
1046                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1047                 rc = -1;
1048                 goto cleanup_err;
1049         }
1050
1051         /* Initialize rest of io_req fields */
1052         cleanup_io_req->sc_cmd = NULL;
1053         cleanup_io_req->port = port;
1054         cleanup_io_req->tgt = tgt;
1055         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1056
1057         xid = cleanup_io_req->xid;
1058
1059         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1060         index = xid % BNX2FC_TASKS_PER_PAGE;
1061
1062         /* Initialize task context for this IO request */
1063         task_page = (struct fcoe_task_ctx_entry *)
1064                         interface->hba->task_ctx[task_idx];
1065         task = &(task_page[index]);
1066         orig_xid = io_req->xid;
1067
1068         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1069
1070         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1071
1072         /* Obtain free SQ entry */
1073         bnx2fc_add_2_sq(tgt, xid);
1074
1075         /* Ring doorbell */
1076         bnx2fc_ring_doorbell(tgt);
1077
1078 cleanup_err:
1079         return rc;
1080 }
1081
1082 /**
1083  * bnx2fc_eh_target_reset: Reset a target
1084  *
1085  * @sc_cmd:     SCSI command
1086  *
1087  * Set from SCSI host template to send task mgmt command to the target
1088  *      and wait for the response
1089  */
1090 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1091 {
1092         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1093 }
1094
1095 /**
1096  * bnx2fc_eh_device_reset - Reset a single LUN
1097  *
1098  * @sc_cmd:     SCSI command
1099  *
1100  * Set from SCSI host template to send task mgmt command to the target
1101  *      and wait for the response
1102  */
1103 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1104 {
1105         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1106 }
1107
1108 int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
1109 {
1110         struct bnx2fc_rport *tgt = io_req->tgt;
1111         struct fc_rport_priv *rdata = tgt->rdata;
1112         int logo_issued;
1113         int rc = SUCCESS;
1114         int wait_cnt = 0;
1115
1116         BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1117                       tgt->flags);
1118         logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1119                                        &tgt->flags);
1120         io_req->wait_for_comp = 1;
1121         bnx2fc_initiate_cleanup(io_req);
1122
1123         spin_unlock_bh(&tgt->tgt_lock);
1124
1125         wait_for_completion(&io_req->tm_done);
1126
1127         io_req->wait_for_comp = 0;
1128         /*
1129          * release the reference taken in eh_abort to allow the
1130          * target to re-login after flushing IOs
1131          */
1132          kref_put(&io_req->refcount, bnx2fc_cmd_release);
1133
1134         if (!logo_issued) {
1135                 clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
1136                 mutex_lock(&lport->disc.disc_mutex);
1137                 lport->tt.rport_logoff(rdata);
1138                 mutex_unlock(&lport->disc.disc_mutex);
1139                 do {
1140                         msleep(BNX2FC_RELOGIN_WAIT_TIME);
1141                         if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
1142                                 rc = FAILED;
1143                                 break;
1144                         }
1145                 } while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
1146         }
1147         spin_lock_bh(&tgt->tgt_lock);
1148         return rc;
1149 }
1150 /**
1151  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1152  *                      SCSI command
1153  *
1154  * @sc_cmd:     SCSI_ML command pointer
1155  *
1156  * SCSI abort request handler
1157  */
1158 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1159 {
1160         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1161         struct fc_rport_libfc_priv *rp = rport->dd_data;
1162         struct bnx2fc_cmd *io_req;
1163         struct fc_lport *lport;
1164         struct bnx2fc_rport *tgt;
1165         int rc = FAILED;
1166
1167
1168         rc = fc_block_scsi_eh(sc_cmd);
1169         if (rc)
1170                 return rc;
1171
1172         lport = shost_priv(sc_cmd->device->host);
1173         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1174                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1175                 return rc;
1176         }
1177
1178         tgt = (struct bnx2fc_rport *)&rp[1];
1179
1180         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1181
1182         spin_lock_bh(&tgt->tgt_lock);
1183         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1184         if (!io_req) {
1185                 /* Command might have just completed */
1186                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1187                 spin_unlock_bh(&tgt->tgt_lock);
1188                 return SUCCESS;
1189         }
1190         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1191                       io_req->refcount.refcount.counter);
1192
1193         /* Hold IO request across abort processing */
1194         kref_get(&io_req->refcount);
1195
1196         BUG_ON(tgt != io_req->tgt);
1197
1198         /* Remove the io_req from the active_q. */
1199         /*
1200          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1201          * issue an ABTS on this particular IO req, as the
1202          * io_req is no longer in the active_q.
1203          */
1204         if (tgt->flush_in_prog) {
1205                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1206                         "flush in progress\n", io_req->xid);
1207                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1208                 spin_unlock_bh(&tgt->tgt_lock);
1209                 return SUCCESS;
1210         }
1211
1212         if (io_req->on_active_queue == 0) {
1213                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1214                                 "not on active_q\n", io_req->xid);
1215                 /*
1216                  * This condition can happen only due to the FW bug,
1217                  * where we do not receive cleanup response from
1218                  * the FW. Handle this case gracefully by erroring
1219                  * back the IO request to SCSI-ml
1220                  */
1221                 bnx2fc_scsi_done(io_req, DID_ABORT);
1222
1223                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1224                 spin_unlock_bh(&tgt->tgt_lock);
1225                 return SUCCESS;
1226         }
1227
1228         /*
1229          * Only eh_abort processing will remove the IO from
1230          * active_cmd_q before processing the request. this is
1231          * done to avoid race conditions between IOs aborted
1232          * as part of task management completion and eh_abort
1233          * processing
1234          */
1235         list_del_init(&io_req->link);
1236         io_req->on_active_queue = 0;
1237         /* Move IO req to retire queue */
1238         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1239
1240         init_completion(&io_req->tm_done);
1241
1242         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1243                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1244                                 "already in abts processing\n", io_req->xid);
1245                 if (cancel_delayed_work(&io_req->timeout_work))
1246                         kref_put(&io_req->refcount,
1247                                  bnx2fc_cmd_release); /* drop timer hold */
1248                 rc = bnx2fc_expl_logo(lport, io_req);
1249                 /* This only occurs when an task abort was requested while ABTS
1250                    is in progress.  Setting the IO_CLEANUP flag will skip the
1251                    RRQ process in the case when the fw generated SCSI_CMD cmpl
1252                    was a result from the ABTS request rather than the CLEANUP
1253                    request */
1254                 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1255                 goto out;
1256         }
1257
1258         /* Cancel the current timer running on this io_req */
1259         if (cancel_delayed_work(&io_req->timeout_work))
1260                 kref_put(&io_req->refcount,
1261                          bnx2fc_cmd_release); /* drop timer hold */
1262         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1263         io_req->wait_for_comp = 1;
1264         rc = bnx2fc_initiate_abts(io_req);
1265         if (rc == FAILED) {
1266                 bnx2fc_initiate_cleanup(io_req);
1267                 spin_unlock_bh(&tgt->tgt_lock);
1268                 wait_for_completion(&io_req->tm_done);
1269                 spin_lock_bh(&tgt->tgt_lock);
1270                 io_req->wait_for_comp = 0;
1271                 goto done;
1272         }
1273         spin_unlock_bh(&tgt->tgt_lock);
1274
1275         wait_for_completion(&io_req->tm_done);
1276
1277         spin_lock_bh(&tgt->tgt_lock);
1278         io_req->wait_for_comp = 0;
1279         if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1280                 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1281                 rc = SUCCESS;
1282         } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1283                                       &io_req->req_flags))) {
1284                 /* Let the scsi-ml try to recover this command */
1285                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1286                        io_req->xid);
1287                 rc = bnx2fc_expl_logo(lport, io_req);
1288                 goto out;
1289         } else {
1290                 /*
1291                  * We come here even when there was a race condition
1292                  * between timeout and abts completion, and abts
1293                  * completion happens just in time.
1294                  */
1295                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1296                 rc = SUCCESS;
1297                 bnx2fc_scsi_done(io_req, DID_ABORT);
1298                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1299         }
1300 done:
1301         /* release the reference taken in eh_abort */
1302         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1303 out:
1304         spin_unlock_bh(&tgt->tgt_lock);
1305         return rc;
1306 }
1307
1308 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1309                                       struct fcoe_task_ctx_entry *task,
1310                                       u8 rx_state)
1311 {
1312         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1313         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1314         u32 offset = cb_arg->offset;
1315         enum fc_rctl r_ctl = cb_arg->r_ctl;
1316         int rc = 0;
1317         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1318
1319         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1320                               "cmd_type = %d\n",
1321                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1322
1323         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1324                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1325                         seq_clnp_req->xid);
1326                 goto free_cb_arg;
1327         }
1328
1329         spin_unlock_bh(&tgt->tgt_lock);
1330         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1331         spin_lock_bh(&tgt->tgt_lock);
1332
1333         if (rc)
1334                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1335                         " IO will abort\n");
1336         seq_clnp_req->cb_arg = NULL;
1337         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1338 free_cb_arg:
1339         kfree(cb_arg);
1340         return;
1341 }
1342
1343 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1344                                   struct fcoe_task_ctx_entry *task,
1345                                   u8 num_rq)
1346 {
1347         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1348                               "refcnt = %d, cmd_type = %d\n",
1349                    io_req->refcount.refcount.counter, io_req->cmd_type);
1350         bnx2fc_scsi_done(io_req, DID_ERROR);
1351         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1352         if (io_req->wait_for_comp)
1353                 complete(&io_req->tm_done);
1354 }
1355
1356 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1357                                struct fcoe_task_ctx_entry *task,
1358                                u8 num_rq)
1359 {
1360         u32 r_ctl;
1361         u32 r_a_tov = FC_DEF_R_A_TOV;
1362         u8 issue_rrq = 0;
1363         struct bnx2fc_rport *tgt = io_req->tgt;
1364
1365         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1366                               "refcnt = %d, cmd_type = %d\n",
1367                    io_req->xid,
1368                    io_req->refcount.refcount.counter, io_req->cmd_type);
1369
1370         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1371                                        &io_req->req_flags)) {
1372                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1373                                 " this io\n");
1374                 return;
1375         }
1376
1377         /* Do not issue RRQ as this IO is already cleanedup */
1378         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1379                                 &io_req->req_flags))
1380                 goto io_compl;
1381
1382         /*
1383          * For ABTS issued due to SCSI eh_abort_handler, timeout
1384          * values are maintained by scsi-ml itself. Cancel timeout
1385          * in case ABTS issued as part of task management function
1386          * or due to FW error.
1387          */
1388         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1389                 if (cancel_delayed_work(&io_req->timeout_work))
1390                         kref_put(&io_req->refcount,
1391                                  bnx2fc_cmd_release); /* drop timer hold */
1392
1393         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1394
1395         switch (r_ctl) {
1396         case FC_RCTL_BA_ACC:
1397                 /*
1398                  * Dont release this cmd yet. It will be relesed
1399                  * after we get RRQ response
1400                  */
1401                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1402                 issue_rrq = 1;
1403                 break;
1404
1405         case FC_RCTL_BA_RJT:
1406                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1407                 break;
1408         default:
1409                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1410                 break;
1411         }
1412
1413         if (issue_rrq) {
1414                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1415                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1416         }
1417         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1418         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1419
1420 io_compl:
1421         if (io_req->wait_for_comp) {
1422                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1423                                        &io_req->req_flags))
1424                         complete(&io_req->tm_done);
1425         } else {
1426                 /*
1427                  * We end up here when ABTS is issued as
1428                  * in asynchronous context, i.e., as part
1429                  * of task management completion, or
1430                  * when FW error is received or when the
1431                  * ABTS is issued when the IO is timed
1432                  * out.
1433                  */
1434
1435                 if (io_req->on_active_queue) {
1436                         list_del_init(&io_req->link);
1437                         io_req->on_active_queue = 0;
1438                         /* Move IO req to retire queue */
1439                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1440                 }
1441                 bnx2fc_scsi_done(io_req, DID_ERROR);
1442                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1443         }
1444 }
1445
1446 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1447 {
1448         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1449         struct bnx2fc_rport *tgt = io_req->tgt;
1450         struct bnx2fc_cmd *cmd, *tmp;
1451         int tm_lun = sc_cmd->device->lun;
1452         int rc = 0;
1453         int lun;
1454
1455         /* called with tgt_lock held */
1456         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1457         /*
1458          * Walk thru the active_ios queue and ABORT the IO
1459          * that matches with the LUN that was reset
1460          */
1461         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1462                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1463                 lun = cmd->sc_cmd->device->lun;
1464                 if (lun == tm_lun) {
1465                         /* Initiate ABTS on this cmd */
1466                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1467                                               &cmd->req_flags)) {
1468                                 /* cancel the IO timeout */
1469                                 if (cancel_delayed_work(&io_req->timeout_work))
1470                                         kref_put(&io_req->refcount,
1471                                                  bnx2fc_cmd_release);
1472                                                         /* timer hold */
1473                                 rc = bnx2fc_initiate_abts(cmd);
1474                                 /* abts shouldn't fail in this context */
1475                                 WARN_ON(rc != SUCCESS);
1476                         } else
1477                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1478                                         " progress for this IO 0x%x\n",
1479                                         cmd->xid);
1480                 }
1481         }
1482 }
1483
1484 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1485 {
1486         struct bnx2fc_rport *tgt = io_req->tgt;
1487         struct bnx2fc_cmd *cmd, *tmp;
1488         int rc = 0;
1489
1490         /* called with tgt_lock held */
1491         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1492         /*
1493          * Walk thru the active_ios queue and ABORT the IO
1494          * that matches with the LUN that was reset
1495          */
1496         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1497                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1498                 /* Initiate ABTS */
1499                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1500                                                         &cmd->req_flags)) {
1501                         /* cancel the IO timeout */
1502                         if (cancel_delayed_work(&io_req->timeout_work))
1503                                 kref_put(&io_req->refcount,
1504                                          bnx2fc_cmd_release); /* timer hold */
1505                         rc = bnx2fc_initiate_abts(cmd);
1506                         /* abts shouldn't fail in this context */
1507                         WARN_ON(rc != SUCCESS);
1508
1509                 } else
1510                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1511                                 " for this IO 0x%x\n", cmd->xid);
1512         }
1513 }
1514
1515 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1516                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1517 {
1518         struct bnx2fc_mp_req *tm_req;
1519         struct fc_frame_header *fc_hdr;
1520         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1521         u64 *hdr;
1522         u64 *temp_hdr;
1523         void *rsp_buf;
1524
1525         /* Called with tgt_lock held */
1526         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1527
1528         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1529                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1530         else {
1531                 /* TM has already timed out and we got
1532                  * delayed completion. Ignore completion
1533                  * processing.
1534                  */
1535                 return;
1536         }
1537
1538         tm_req = &(io_req->mp_req);
1539         fc_hdr = &(tm_req->resp_fc_hdr);
1540         hdr = (u64 *)fc_hdr;
1541         temp_hdr = (u64 *)
1542                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1543         hdr[0] = cpu_to_be64(temp_hdr[0]);
1544         hdr[1] = cpu_to_be64(temp_hdr[1]);
1545         hdr[2] = cpu_to_be64(temp_hdr[2]);
1546
1547         tm_req->resp_len =
1548                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1549
1550         rsp_buf = tm_req->resp_buf;
1551
1552         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1553                 bnx2fc_parse_fcp_rsp(io_req,
1554                                      (struct fcoe_fcp_rsp_payload *)
1555                                      rsp_buf, num_rq);
1556                 if (io_req->fcp_rsp_code == 0) {
1557                         /* TM successful */
1558                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1559                                 bnx2fc_lun_reset_cmpl(io_req);
1560                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1561                                 bnx2fc_tgt_reset_cmpl(io_req);
1562                 }
1563         } else {
1564                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1565                         fc_hdr->fh_r_ctl);
1566         }
1567         if (!sc_cmd->SCp.ptr) {
1568                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1569                 return;
1570         }
1571         switch (io_req->fcp_status) {
1572         case FC_GOOD:
1573                 if (io_req->cdb_status == 0) {
1574                         /* Good IO completion */
1575                         sc_cmd->result = DID_OK << 16;
1576                 } else {
1577                         /* Transport status is good, SCSI status not good */
1578                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1579                 }
1580                 if (io_req->fcp_resid)
1581                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1582                 break;
1583
1584         default:
1585                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1586                            io_req->fcp_status);
1587                 break;
1588         }
1589
1590         sc_cmd = io_req->sc_cmd;
1591         io_req->sc_cmd = NULL;
1592
1593         /* check if the io_req exists in tgt's tmf_q */
1594         if (io_req->on_tmf_queue) {
1595
1596                 list_del_init(&io_req->link);
1597                 io_req->on_tmf_queue = 0;
1598         } else {
1599
1600                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1601                 return;
1602         }
1603
1604         sc_cmd->SCp.ptr = NULL;
1605         sc_cmd->scsi_done(sc_cmd);
1606
1607         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1608         if (io_req->wait_for_comp) {
1609                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1610                 complete(&io_req->tm_done);
1611         }
1612 }
1613
1614 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1615                            int bd_index)
1616 {
1617         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1618         int frag_size, sg_frags;
1619
1620         sg_frags = 0;
1621         while (sg_len) {
1622                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1623                         frag_size = BNX2FC_BD_SPLIT_SZ;
1624                 else
1625                         frag_size = sg_len;
1626                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1627                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1628                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1629                 bd[bd_index + sg_frags].flags = 0;
1630
1631                 addr += (u64) frag_size;
1632                 sg_frags++;
1633                 sg_len -= frag_size;
1634         }
1635         return sg_frags;
1636
1637 }
1638
1639 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1640 {
1641         struct bnx2fc_interface *interface = io_req->port->priv;
1642         struct bnx2fc_hba *hba = interface->hba;
1643         struct scsi_cmnd *sc = io_req->sc_cmd;
1644         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1645         struct scatterlist *sg;
1646         int byte_count = 0;
1647         int sg_count = 0;
1648         int bd_count = 0;
1649         int sg_frags;
1650         unsigned int sg_len;
1651         u64 addr;
1652         int i;
1653
1654         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1655                               scsi_sg_count(sc), sc->sc_data_direction);
1656         scsi_for_each_sg(sc, sg, sg_count, i) {
1657                 sg_len = sg_dma_len(sg);
1658                 addr = sg_dma_address(sg);
1659                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1660                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1661                                                    bd_count);
1662                 } else {
1663
1664                         sg_frags = 1;
1665                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1666                         bd[bd_count].buf_addr_hi  = addr >> 32;
1667                         bd[bd_count].buf_len = (u16)sg_len;
1668                         bd[bd_count].flags = 0;
1669                 }
1670                 bd_count += sg_frags;
1671                 byte_count += sg_len;
1672         }
1673         if (byte_count != scsi_bufflen(sc))
1674                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1675                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1676                         io_req->xid);
1677         return bd_count;
1678 }
1679
1680 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1681 {
1682         struct scsi_cmnd *sc = io_req->sc_cmd;
1683         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1684         int bd_count;
1685
1686         if (scsi_sg_count(sc)) {
1687                 bd_count = bnx2fc_map_sg(io_req);
1688                 if (bd_count == 0)
1689                         return -ENOMEM;
1690         } else {
1691                 bd_count = 0;
1692                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1693                 bd[0].buf_len = bd[0].flags = 0;
1694         }
1695         io_req->bd_tbl->bd_valid = bd_count;
1696
1697         return 0;
1698 }
1699
1700 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1701 {
1702         struct scsi_cmnd *sc = io_req->sc_cmd;
1703
1704         if (io_req->bd_tbl->bd_valid && sc) {
1705                 scsi_dma_unmap(sc);
1706                 io_req->bd_tbl->bd_valid = 0;
1707         }
1708 }
1709
1710 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1711                                   struct fcp_cmnd *fcp_cmnd)
1712 {
1713         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1714         char tag[2];
1715
1716         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1717
1718         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1719
1720         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1721         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1722
1723         fcp_cmnd->fc_cmdref = 0;
1724         fcp_cmnd->fc_pri_ta = 0;
1725         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1726         fcp_cmnd->fc_flags = io_req->io_req_flags;
1727
1728         if (scsi_populate_tag_msg(sc_cmd, tag)) {
1729                 switch (tag[0]) {
1730                 case HEAD_OF_QUEUE_TAG:
1731                         fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1732                         break;
1733                 case ORDERED_QUEUE_TAG:
1734                         fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1735                         break;
1736                 default:
1737                         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1738                         break;
1739                 }
1740         } else {
1741                 fcp_cmnd->fc_pri_ta = 0;
1742         }
1743 }
1744
1745 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1746                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1747                                  u8 num_rq)
1748 {
1749         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1750         struct bnx2fc_rport *tgt = io_req->tgt;
1751         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1752         u32 rq_buff_len = 0;
1753         int i;
1754         unsigned char *rq_data;
1755         unsigned char *dummy;
1756         int fcp_sns_len = 0;
1757         int fcp_rsp_len = 0;
1758
1759         io_req->fcp_status = FC_GOOD;
1760         io_req->fcp_resid = fcp_rsp->fcp_resid;
1761
1762         io_req->scsi_comp_flags = rsp_flags;
1763         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1764                                 fcp_rsp->scsi_status_code;
1765
1766         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1767         if (num_rq) {
1768
1769                 /*
1770                  * We do not anticipate num_rq >1, as the linux defined
1771                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1772                  * 256 bytes of single rq buffer is good enough to hold this.
1773                  */
1774
1775                 if (rsp_flags &
1776                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1777                         fcp_rsp_len = rq_buff_len
1778                                         = fcp_rsp->fcp_rsp_len;
1779                 }
1780
1781                 if (rsp_flags &
1782                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1783                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1784                         rq_buff_len += fcp_rsp->fcp_sns_len;
1785                 }
1786
1787                 io_req->fcp_rsp_len = fcp_rsp_len;
1788                 io_req->fcp_sns_len = fcp_sns_len;
1789
1790                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1791                         /* Invalid sense sense length. */
1792                         printk(KERN_ERR PFX "invalid sns length %d\n",
1793                                 rq_buff_len);
1794                         /* reset rq_buff_len */
1795                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1796                 }
1797
1798                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1799
1800                 if (num_rq > 1) {
1801                         /* We do not need extra sense data */
1802                         for (i = 1; i < num_rq; i++)
1803                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1804                 }
1805
1806                 /* fetch fcp_rsp_code */
1807                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1808                         /* Only for task management function */
1809                         io_req->fcp_rsp_code = rq_data[3];
1810                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1811                                 io_req->fcp_rsp_code);
1812                 }
1813
1814                 /* fetch sense data */
1815                 rq_data += fcp_rsp_len;
1816
1817                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1818                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1819                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1820                 }
1821
1822                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1823                 if (fcp_sns_len)
1824                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1825
1826                 /* return RQ entries */
1827                 for (i = 0; i < num_rq; i++)
1828                         bnx2fc_return_rqe(tgt, 1);
1829         }
1830 }
1831
1832 /**
1833  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1834  *
1835  * @host:       The Scsi_Host the command was issued to
1836  * @sc_cmd:     struct scsi_cmnd to be executed
1837  *
1838  * This is the IO strategy routine, called by SCSI-ML
1839  **/
1840 int bnx2fc_queuecommand(struct Scsi_Host *host,
1841                         struct scsi_cmnd *sc_cmd)
1842 {
1843         struct fc_lport *lport = shost_priv(host);
1844         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1845         struct fc_rport_libfc_priv *rp = rport->dd_data;
1846         struct bnx2fc_rport *tgt;
1847         struct bnx2fc_cmd *io_req;
1848         int rc = 0;
1849         int rval;
1850
1851         rval = fc_remote_port_chkready(rport);
1852         if (rval) {
1853                 sc_cmd->result = rval;
1854                 sc_cmd->scsi_done(sc_cmd);
1855                 return 0;
1856         }
1857
1858         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1859                 rc = SCSI_MLQUEUE_HOST_BUSY;
1860                 goto exit_qcmd;
1861         }
1862
1863         /* rport and tgt are allocated together, so tgt should be non-NULL */
1864         tgt = (struct bnx2fc_rport *)&rp[1];
1865
1866         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1867                 /*
1868                  * Session is not offloaded yet. Let SCSI-ml retry
1869                  * the command.
1870                  */
1871                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1872                 goto exit_qcmd;
1873         }
1874
1875         io_req = bnx2fc_cmd_alloc(tgt);
1876         if (!io_req) {
1877                 rc = SCSI_MLQUEUE_HOST_BUSY;
1878                 goto exit_qcmd;
1879         }
1880         io_req->sc_cmd = sc_cmd;
1881
1882         if (bnx2fc_post_io_req(tgt, io_req)) {
1883                 printk(KERN_ERR PFX "Unable to post io_req\n");
1884                 rc = SCSI_MLQUEUE_HOST_BUSY;
1885                 goto exit_qcmd;
1886         }
1887 exit_qcmd:
1888         return rc;
1889 }
1890
1891 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1892                                    struct fcoe_task_ctx_entry *task,
1893                                    u8 num_rq)
1894 {
1895         struct fcoe_fcp_rsp_payload *fcp_rsp;
1896         struct bnx2fc_rport *tgt = io_req->tgt;
1897         struct scsi_cmnd *sc_cmd;
1898         struct Scsi_Host *host;
1899
1900
1901         /* scsi_cmd_cmpl is called with tgt lock held */
1902
1903         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1904                 /* we will not receive ABTS response for this IO */
1905                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1906                            "this scsi cmd\n");
1907         }
1908
1909         /* Cancel the timeout_work, as we received IO completion */
1910         if (cancel_delayed_work(&io_req->timeout_work))
1911                 kref_put(&io_req->refcount,
1912                          bnx2fc_cmd_release); /* drop timer hold */
1913
1914         sc_cmd = io_req->sc_cmd;
1915         if (sc_cmd == NULL) {
1916                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1917                 return;
1918         }
1919
1920         /* Fetch fcp_rsp from task context and perform cmd completion */
1921         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1922                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1923
1924         /* parse fcp_rsp and obtain sense data from RQ if available */
1925         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1926
1927         host = sc_cmd->device->host;
1928         if (!sc_cmd->SCp.ptr) {
1929                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1930                 return;
1931         }
1932
1933         if (io_req->on_active_queue) {
1934                 list_del_init(&io_req->link);
1935                 io_req->on_active_queue = 0;
1936                 /* Move IO req to retire queue */
1937                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1938         } else {
1939                 /* This should not happen, but could have been pulled
1940                  * by bnx2fc_flush_active_ios(), or during a race
1941                  * between command abort and (late) completion.
1942                  */
1943                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1944                 if (io_req->wait_for_comp)
1945                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1946                                                &io_req->req_flags))
1947                                 complete(&io_req->tm_done);
1948         }
1949
1950         bnx2fc_unmap_sg_list(io_req);
1951         io_req->sc_cmd = NULL;
1952
1953         switch (io_req->fcp_status) {
1954         case FC_GOOD:
1955                 if (io_req->cdb_status == 0) {
1956                         /* Good IO completion */
1957                         sc_cmd->result = DID_OK << 16;
1958                 } else {
1959                         /* Transport status is good, SCSI status not good */
1960                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1961                                  " fcp_resid = 0x%x\n",
1962                                 io_req->cdb_status, io_req->fcp_resid);
1963                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1964                 }
1965                 if (io_req->fcp_resid)
1966                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1967                 break;
1968         default:
1969                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1970                         io_req->fcp_status);
1971                 break;
1972         }
1973         sc_cmd->SCp.ptr = NULL;
1974         sc_cmd->scsi_done(sc_cmd);
1975         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1976 }
1977
1978 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1979                                struct bnx2fc_cmd *io_req)
1980 {
1981         struct fcoe_task_ctx_entry *task;
1982         struct fcoe_task_ctx_entry *task_page;
1983         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1984         struct fcoe_port *port = tgt->port;
1985         struct bnx2fc_interface *interface = port->priv;
1986         struct bnx2fc_hba *hba = interface->hba;
1987         struct fc_lport *lport = port->lport;
1988         struct fc_stats *stats;
1989         int task_idx, index;
1990         u16 xid;
1991
1992         /* Initialize rest of io_req fields */
1993         io_req->cmd_type = BNX2FC_SCSI_CMD;
1994         io_req->port = port;
1995         io_req->tgt = tgt;
1996         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1997         sc_cmd->SCp.ptr = (char *)io_req;
1998
1999         stats = per_cpu_ptr(lport->stats, get_cpu());
2000         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2001                 io_req->io_req_flags = BNX2FC_READ;
2002                 stats->InputRequests++;
2003                 stats->InputBytes += io_req->data_xfer_len;
2004         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2005                 io_req->io_req_flags = BNX2FC_WRITE;
2006                 stats->OutputRequests++;
2007                 stats->OutputBytes += io_req->data_xfer_len;
2008         } else {
2009                 io_req->io_req_flags = 0;
2010                 stats->ControlRequests++;
2011         }
2012         put_cpu();
2013
2014         xid = io_req->xid;
2015
2016         /* Build buffer descriptor list for firmware from sg list */
2017         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2018                 printk(KERN_ERR PFX "BD list creation failed\n");
2019                 spin_lock_bh(&tgt->tgt_lock);
2020                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2021                 spin_unlock_bh(&tgt->tgt_lock);
2022                 return -EAGAIN;
2023         }
2024
2025         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2026         index = xid % BNX2FC_TASKS_PER_PAGE;
2027
2028         /* Initialize task context for this IO request */
2029         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2030         task = &(task_page[index]);
2031         bnx2fc_init_task(io_req, task);
2032
2033         spin_lock_bh(&tgt->tgt_lock);
2034
2035         if (tgt->flush_in_prog) {
2036                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2037                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2038                 spin_unlock_bh(&tgt->tgt_lock);
2039                 return -EAGAIN;
2040         }
2041
2042         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2043                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2044                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2045                 spin_unlock_bh(&tgt->tgt_lock);
2046                 return -EAGAIN;
2047         }
2048
2049         /* Time IO req */
2050         if (tgt->io_timeout)
2051                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2052         /* Obtain free SQ entry */
2053         bnx2fc_add_2_sq(tgt, xid);
2054
2055         /* Enqueue the io_req to active_cmd_queue */
2056
2057         io_req->on_active_queue = 1;
2058         /* move io_req from pending_queue to active_queue */
2059         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2060
2061         /* Ring doorbell */
2062         bnx2fc_ring_doorbell(tgt);
2063         spin_unlock_bh(&tgt->tgt_lock);
2064         return 0;
2065 }