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 - 2011 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                                                 u16 min_xid, u16 max_xid)
 244 {
 245         struct bnx2fc_cmd_mgr *cmgr;
 246         struct io_bdt *bdt_info;
 247         struct bnx2fc_cmd *io_req;
 248         size_t len;
 249         u32 mem_size;
 250         u16 xid;
 251         int i;
 252         int num_ios, num_pri_ios;
 253         size_t bd_tbl_sz;
 254         int arr_sz = num_possible_cpus() + 1;
 255
 256         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 257                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 258                                         and max_xid 0x%x\n", min_xid, max_xid);
 259                 return NULL;
 260         }
 261         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 262
 263         num_ios = max_xid - min_xid + 1;
 264         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 265         len += sizeof(struct bnx2fc_cmd_mgr);
 266
 267         cmgr = kzalloc(len, GFP_KERNEL);
 268         if (!cmgr) {
 269                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
 270                 return NULL;
 271         }
 272
 273         cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
 274                                   arr_sz, GFP_KERNEL);
 275         if (!cmgr->free_list) {
 276                 printk(KERN_ERR PFX "failed to alloc free_list\n");
 277                 goto mem_err;
 278         }
 279
 280         cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
 281                                        arr_sz, GFP_KERNEL);
 282         if (!cmgr->free_list_lock) {
 283                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 284                 goto mem_err;
 285         }
 286
 287         cmgr->hba = hba;
 288         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 289
 290         for (i = 0; i < arr_sz; i++)  {
 291                 INIT_LIST_HEAD(&cmgr->free_list[i]);
 292                 spin_lock_init(&cmgr->free_list_lock[i]);
 293         }
 294
 295         /*
 296          * Pre-allocated pool of bnx2fc_cmds.
 297          * Last entry in the free list array is the free list
 298          * of slow path requests.
 299          */
 300         xid = BNX2FC_MIN_XID;
 301         num_pri_ios = num_ios - BNX2FC_ELSTM_XIDS;
 302         for (i = 0; i < num_ios; i++) {
 303                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 304
 305                 if (!io_req) {
 306                         printk(KERN_ERR PFX "failed to alloc io_req\n");
 307                         goto mem_err;
 308                 }
 309
 310                 INIT_LIST_HEAD(&io_req->link);
 311                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 312
 313                 io_req->xid = xid++;
 314                 if (i < num_pri_ios)
 315                         list_add_tail(&io_req->link,
 316                                 &cmgr->free_list[io_req->xid %
 317                                                  num_possible_cpus()]);
 318                 else
 319                         list_add_tail(&io_req->link,
 320                                 &cmgr->free_list[num_possible_cpus()]);
 321                 io_req++;
 322         }
 323
 324         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 325         mem_size = num_ios * sizeof(struct io_bdt *);
 326         cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
 327         if (!cmgr->io_bdt_pool) {
 328                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 329                 goto mem_err;
 330         }
 331
 332         mem_size = sizeof(struct io_bdt);
 333         for (i = 0; i < num_ios; i++) {
 334                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 335                 if (!cmgr->io_bdt_pool[i]) {
 336                         printk(KERN_ERR PFX "failed to alloc "
 337                                 "io_bdt_pool[%d]\n", i);
 338                         goto mem_err;
 339                 }
 340         }
 341
 342         /* Allocate an map fcoe_bdt_ctx structures */
 343         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 344         for (i = 0; i < num_ios; i++) {
 345                 bdt_info = cmgr->io_bdt_pool[i];
 346                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 347                                                       bd_tbl_sz,
 348                                                       &bdt_info->bd_tbl_dma,
 349                                                       GFP_KERNEL);
 350                 if (!bdt_info->bd_tbl) {
 351                         printk(KERN_ERR PFX "failed to alloc "
 352                                 "bdt_tbl[%d]\n", i);
 353                         goto mem_err;
 354                 }
 355         }
 356
 357         return cmgr;
 358
 359 mem_err:
 360         bnx2fc_cmd_mgr_free(cmgr);
 361         return NULL;
 362 }
 363
 364 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 365 {
 366         struct io_bdt *bdt_info;
 367         struct bnx2fc_hba *hba = cmgr->hba;
 368         size_t bd_tbl_sz;
 369         u16 min_xid = BNX2FC_MIN_XID;
 370         u16 max_xid = BNX2FC_MAX_XID;
 371         int num_ios;
 372         int i;
 373
 374         num_ios = max_xid - min_xid + 1;
 375
 376         /* Free fcoe_bdt_ctx structures */
 377         if (!cmgr->io_bdt_pool)
 378                 goto free_cmd_pool;
 379
 380         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 381         for (i = 0; i < num_ios; i++) {
 382                 bdt_info = cmgr->io_bdt_pool[i];
 383                 if (bdt_info->bd_tbl) {
 384                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 385                                             bdt_info->bd_tbl,
 386                                             bdt_info->bd_tbl_dma);
 387                         bdt_info->bd_tbl = NULL;
 388                 }
 389         }
 390
 391         /* Destroy io_bdt pool */
 392         for (i = 0; i < num_ios; i++) {
 393                 kfree(cmgr->io_bdt_pool[i]);
 394                 cmgr->io_bdt_pool[i] = NULL;
 395         }
 396
 397         kfree(cmgr->io_bdt_pool);
 398         cmgr->io_bdt_pool = NULL;
 399
 400 free_cmd_pool:
 401         kfree(cmgr->free_list_lock);
 402
 403         /* Destroy cmd pool */
 404         if (!cmgr->free_list)
 405                 goto free_cmgr;
 406
 407         for (i = 0; i < num_possible_cpus() + 1; i++)  {
 408                 struct list_head *list;
 409                 struct list_head *tmp;
 410
 411                 list_for_each_safe(list, tmp, &cmgr->free_list[i]) {
 412                         struct bnx2fc_cmd *io_req = (struct bnx2fc_cmd *)list;
 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_req_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 = starget_to_rport(scsi_target(sc_cmd->device));
 690         struct fc_rport_libfc_priv *rp = rport->dd_data;
 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         port = lport_priv(lport);
 709         interface = port->priv;
 710
 711         if (rport == NULL) {
 712                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 713                 rc = FAILED;
 714                 goto tmf_err;
 715         }
 716
 717         rc = fc_block_scsi_eh(sc_cmd);
 718         if (rc)
 719                 return rc;
 720
 721         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 722                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 723                 rc = FAILED;
 724                 goto tmf_err;
 725         }
 726         /* rport and tgt are allocated together, so tgt should be non-NULL */
 727         tgt = (struct bnx2fc_rport *)&rp[1];
 728
 729         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 730                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 731                 rc = FAILED;
 732                 goto tmf_err;
 733         }
 734 retry_tmf:
 735         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 736         if (!io_req) {
 737                 if (time_after(jiffies, start + HZ)) {
 738                         printk(KERN_ERR PFX "tmf: Failed TMF");
 739                         rc = FAILED;
 740                         goto tmf_err;
 741                 }
 742                 msleep(20);
 743                 goto retry_tmf;
 744         }
 745         /* Initialize rest of io_req fields */
 746         io_req->sc_cmd = sc_cmd;
 747         io_req->port = port;
 748         io_req->tgt = tgt;
 749
 750         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 751
 752         rc = bnx2fc_init_mp_req(io_req);
 753         if (rc == FAILED) {
 754                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 755                 spin_lock_bh(&tgt->tgt_lock);
 756                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 757                 spin_unlock_bh(&tgt->tgt_lock);
 758                 goto tmf_err;
 759         }
 760
 761         /* Set TM flags */
 762         io_req->io_req_flags = 0;
 763         tm_req->tm_flags = tm_flags;
 764
 765         /* Fill FCP_CMND */
 766         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 767         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 768         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 769         fcp_cmnd->fc_dl = 0;
 770
 771         /* Fill FC header */
 772         fc_hdr = &(tm_req->req_fc_hdr);
 773         sid = tgt->sid;
 774         did = rport->port_id;
 775         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 776                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 777                            FC_FC_SEQ_INIT, 0);
 778         /* Obtain exchange id */
 779         xid = io_req->xid;
 780
 781         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 782         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 783         index = xid % BNX2FC_TASKS_PER_PAGE;
 784
 785         /* Initialize task context for this IO request */
 786         task_page = (struct fcoe_task_ctx_entry *)
 787                         interface->hba->task_ctx[task_idx];
 788         task = &(task_page[index]);
 789         bnx2fc_init_mp_task(io_req, task);
 790
 791         sc_cmd->SCp.ptr = (char *)io_req;
 792
 793         /* Obtain free SQ entry */
 794         spin_lock_bh(&tgt->tgt_lock);
 795         bnx2fc_add_2_sq(tgt, xid);
 796
 797         /* Enqueue the io_req to active_tm_queue */
 798         io_req->on_tmf_queue = 1;
 799         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 800
 801         init_completion(&io_req->tm_done);
 802         io_req->wait_for_comp = 1;
 803
 804         /* Ring doorbell */
 805         bnx2fc_ring_doorbell(tgt);
 806         spin_unlock_bh(&tgt->tgt_lock);
 807
 808         rc = wait_for_completion_timeout(&io_req->tm_done,
 809                                          BNX2FC_TM_TIMEOUT * HZ);
 810         spin_lock_bh(&tgt->tgt_lock);
 811
 812         io_req->wait_for_comp = 0;
 813         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags)))
 814                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 815
 816         spin_unlock_bh(&tgt->tgt_lock);
 817
 818         if (!rc) {
 819                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 820                 rc = FAILED;
 821         } else {
 822                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 823                 rc = SUCCESS;
 824         }
 825 tmf_err:
 826         return rc;
 827 }
 828
 829 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 830 {
 831         struct fc_lport *lport;
 832         struct bnx2fc_rport *tgt = io_req->tgt;
 833         struct fc_rport *rport = tgt->rport;
 834         struct fc_rport_priv *rdata = tgt->rdata;
 835         struct bnx2fc_interface *interface;
 836         struct fcoe_port *port;
 837         struct bnx2fc_cmd *abts_io_req;
 838         struct fcoe_task_ctx_entry *task;
 839         struct fcoe_task_ctx_entry *task_page;
 840         struct fc_frame_header *fc_hdr;
 841         struct bnx2fc_mp_req *abts_req;
 842         int task_idx, index;
 843         u32 sid, did;
 844         u16 xid;
 845         int rc = SUCCESS;
 846         u32 r_a_tov = rdata->r_a_tov;
 847
 848         /* called with tgt_lock held */
 849         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 850
 851         port = io_req->port;
 852         interface = port->priv;
 853         lport = port->lport;
 854
 855         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 856                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 857                 rc = FAILED;
 858                 goto abts_err;
 859         }
 860
 861         if (rport == NULL) {
 862                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 863                 rc = FAILED;
 864                 goto abts_err;
 865         }
 866
 867         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 868                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 869                 rc = FAILED;
 870                 goto abts_err;
 871         }
 872
 873         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 874         if (!abts_io_req) {
 875                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 876                 rc = FAILED;
 877                 goto abts_err;
 878         }
 879
 880         /* Initialize rest of io_req fields */
 881         abts_io_req->sc_cmd = NULL;
 882         abts_io_req->port = port;
 883         abts_io_req->tgt = tgt;
 884         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 885
 886         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 887         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 888
 889         /* Fill FC header */
 890         fc_hdr = &(abts_req->req_fc_hdr);
 891
 892         /* Obtain oxid and rxid for the original exchange to be aborted */
 893         fc_hdr->fh_ox_id = htons(io_req->xid);
 894         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 895
 896         sid = tgt->sid;
 897         did = rport->port_id;
 898
 899         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 900                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 901                            FC_FC_SEQ_INIT, 0);
 902
 903         xid = abts_io_req->xid;
 904         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 905         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 906         index = xid % BNX2FC_TASKS_PER_PAGE;
 907
 908         /* Initialize task context for this IO request */
 909         task_page = (struct fcoe_task_ctx_entry *)
 910                         interface->hba->task_ctx[task_idx];
 911         task = &(task_page[index]);
 912         bnx2fc_init_mp_task(abts_io_req, task);
 913
 914         /*
 915          * ABTS task is a temporary task that will be cleaned up
 916          * irrespective of ABTS response. We need to start the timer
 917          * for the original exchange, as the CQE is posted for the original
 918          * IO request.
 919          *
 920          * Timer for ABTS is started only when it is originated by a
 921          * TM request. For the ABTS issued as part of ULP timeout,
 922          * scsi-ml maintains the timers.
 923          */
 924
 925         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 926         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 927
 928         /* Obtain free SQ entry */
 929         bnx2fc_add_2_sq(tgt, xid);
 930
 931         /* Ring doorbell */
 932         bnx2fc_ring_doorbell(tgt);
 933
 934 abts_err:
 935         return rc;
 936 }
 937
 938 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 939                                 enum fc_rctl r_ctl)
 940 {
 941         struct fc_lport *lport;
 942         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 943         struct bnx2fc_interface *interface;
 944         struct fcoe_port *port;
 945         struct bnx2fc_cmd *seq_clnp_req;
 946         struct fcoe_task_ctx_entry *task;
 947         struct fcoe_task_ctx_entry *task_page;
 948         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 949         int task_idx, index;
 950         u16 xid;
 951         int rc = 0;
 952
 953         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 954                    orig_io_req->xid);
 955         kref_get(&orig_io_req->refcount);
 956
 957         port = orig_io_req->port;
 958         interface = port->priv;
 959         lport = port->lport;
 960
 961         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 962         if (!cb_arg) {
 963                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 964                 rc = -ENOMEM;
 965                 goto cleanup_err;
 966         }
 967
 968         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 969         if (!seq_clnp_req) {
 970                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 971                 rc = -ENOMEM;
 972                 kfree(cb_arg);
 973                 goto cleanup_err;
 974         }
 975         /* Initialize rest of io_req fields */
 976         seq_clnp_req->sc_cmd = NULL;
 977         seq_clnp_req->port = port;
 978         seq_clnp_req->tgt = tgt;
 979         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 980
 981         xid = seq_clnp_req->xid;
 982
 983         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 984         index = xid % BNX2FC_TASKS_PER_PAGE;
 985
 986         /* Initialize task context for this IO request */
 987         task_page = (struct fcoe_task_ctx_entry *)
 988                      interface->hba->task_ctx[task_idx];
 989         task = &(task_page[index]);
 990         cb_arg->aborted_io_req = orig_io_req;
 991         cb_arg->io_req = seq_clnp_req;
 992         cb_arg->r_ctl = r_ctl;
 993         cb_arg->offset = offset;
 994         seq_clnp_req->cb_arg = cb_arg;
 995
 996         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 997         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 998
 999         /* Obtain free SQ entry */
1000         bnx2fc_add_2_sq(tgt, xid);
1001
1002         /* Ring doorbell */
1003         bnx2fc_ring_doorbell(tgt);
1004 cleanup_err:
1005         return rc;
1006 }
1007
1008 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1009 {
1010         struct fc_lport *lport;
1011         struct bnx2fc_rport *tgt = io_req->tgt;
1012         struct bnx2fc_interface *interface;
1013         struct fcoe_port *port;
1014         struct bnx2fc_cmd *cleanup_io_req;
1015         struct fcoe_task_ctx_entry *task;
1016         struct fcoe_task_ctx_entry *task_page;
1017         int task_idx, index;
1018         u16 xid, orig_xid;
1019         int rc = 0;
1020
1021         /* ASSUMPTION: called with tgt_lock held */
1022         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1023
1024         port = io_req->port;
1025         interface = port->priv;
1026         lport = port->lport;
1027
1028         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1029         if (!cleanup_io_req) {
1030                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1031                 rc = -1;
1032                 goto cleanup_err;
1033         }
1034
1035         /* Initialize rest of io_req fields */
1036         cleanup_io_req->sc_cmd = NULL;
1037         cleanup_io_req->port = port;
1038         cleanup_io_req->tgt = tgt;
1039         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1040
1041         xid = cleanup_io_req->xid;
1042
1043         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1044         index = xid % BNX2FC_TASKS_PER_PAGE;
1045
1046         /* Initialize task context for this IO request */
1047         task_page = (struct fcoe_task_ctx_entry *)
1048                         interface->hba->task_ctx[task_idx];
1049         task = &(task_page[index]);
1050         orig_xid = io_req->xid;
1051
1052         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1053
1054         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1055
1056         /* Obtain free SQ entry */
1057         bnx2fc_add_2_sq(tgt, xid);
1058
1059         /* Ring doorbell */
1060         bnx2fc_ring_doorbell(tgt);
1061
1062 cleanup_err:
1063         return rc;
1064 }
1065
1066 /**
1067  * bnx2fc_eh_target_reset: Reset a target
1068  *
1069  * @sc_cmd:     SCSI command
1070  *
1071  * Set from SCSI host template to send task mgmt command to the target
1072  *      and wait for the response
1073  */
1074 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1075 {
1076         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1077 }
1078
1079 /**
1080  * bnx2fc_eh_device_reset - Reset a single LUN
1081  *
1082  * @sc_cmd:     SCSI command
1083  *
1084  * Set from SCSI host template to send task mgmt command to the target
1085  *      and wait for the response
1086  */
1087 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1088 {
1089         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1090 }
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 = FAILED;
1108
1109
1110         rc = fc_block_scsi_eh(sc_cmd);
1111         if (rc)
1112                 return rc;
1113
1114         lport = shost_priv(sc_cmd->device->host);
1115         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1116                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1117                 return rc;
1118         }
1119
1120         tgt = (struct bnx2fc_rport *)&rp[1];
1121
1122         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1123
1124         spin_lock_bh(&tgt->tgt_lock);
1125         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1126         if (!io_req) {
1127                 /* Command might have just completed */
1128                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1129                 spin_unlock_bh(&tgt->tgt_lock);
1130                 return SUCCESS;
1131         }
1132         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1133                       io_req->refcount.refcount.counter);
1134
1135         /* Hold IO request across abort processing */
1136         kref_get(&io_req->refcount);
1137
1138         BUG_ON(tgt != io_req->tgt);
1139
1140         /* Remove the io_req from the active_q. */
1141         /*
1142          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1143          * issue an ABTS on this particular IO req, as the
1144          * io_req is no longer in the active_q.
1145          */
1146         if (tgt->flush_in_prog) {
1147                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1148                         "flush in progress\n", io_req->xid);
1149                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1150                 spin_unlock_bh(&tgt->tgt_lock);
1151                 return SUCCESS;
1152         }
1153
1154         if (io_req->on_active_queue == 0) {
1155                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1156                                 "not on active_q\n", io_req->xid);
1157                 /*
1158                  * This condition can happen only due to the FW bug,
1159                  * where we do not receive cleanup response from
1160                  * the FW. Handle this case gracefully by erroring
1161                  * back the IO request to SCSI-ml
1162                  */
1163                 bnx2fc_scsi_done(io_req, DID_ABORT);
1164
1165                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1166                 spin_unlock_bh(&tgt->tgt_lock);
1167                 return SUCCESS;
1168         }
1169
1170         /*
1171          * Only eh_abort processing will remove the IO from
1172          * active_cmd_q before processing the request. this is
1173          * done to avoid race conditions between IOs aborted
1174          * as part of task management completion and eh_abort
1175          * processing
1176          */
1177         list_del_init(&io_req->link);
1178         io_req->on_active_queue = 0;
1179         /* Move IO req to retire queue */
1180         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1181
1182         init_completion(&io_req->tm_done);
1183         io_req->wait_for_comp = 1;
1184
1185         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1186                 /* Cancel the current timer running on this io_req */
1187                 if (cancel_delayed_work(&io_req->timeout_work))
1188                         kref_put(&io_req->refcount,
1189                                  bnx2fc_cmd_release); /* drop timer hold */
1190                 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1191                 rc = bnx2fc_initiate_abts(io_req);
1192         } else {
1193                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1194                                 "already in abts processing\n", io_req->xid);
1195                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1196                 spin_unlock_bh(&tgt->tgt_lock);
1197                 return SUCCESS;
1198         }
1199         if (rc == FAILED) {
1200                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1201                 spin_unlock_bh(&tgt->tgt_lock);
1202                 return rc;
1203         }
1204         spin_unlock_bh(&tgt->tgt_lock);
1205
1206         wait_for_completion(&io_req->tm_done);
1207
1208         spin_lock_bh(&tgt->tgt_lock);
1209         io_req->wait_for_comp = 0;
1210         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1211                                     &io_req->req_flags))) {
1212                 /* Let the scsi-ml try to recover this command */
1213                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1214                        io_req->xid);
1215                 rc = FAILED;
1216         } else {
1217                 /*
1218                  * We come here even when there was a race condition
1219                  * between timeout and abts completion, and abts
1220                  * completion happens just in time.
1221                  */
1222                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1223                 rc = SUCCESS;
1224                 bnx2fc_scsi_done(io_req, DID_ABORT);
1225                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1226         }
1227
1228         /* release the reference taken in eh_abort */
1229         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1230         spin_unlock_bh(&tgt->tgt_lock);
1231         return rc;
1232 }
1233
1234 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1235                                       struct fcoe_task_ctx_entry *task,
1236                                       u8 rx_state)
1237 {
1238         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1239         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1240         u32 offset = cb_arg->offset;
1241         enum fc_rctl r_ctl = cb_arg->r_ctl;
1242         int rc = 0;
1243         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1244
1245         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1246                               "cmd_type = %d\n",
1247                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1248
1249         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1250                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1251                         seq_clnp_req->xid);
1252                 goto free_cb_arg;
1253         }
1254
1255         spin_unlock_bh(&tgt->tgt_lock);
1256         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1257         spin_lock_bh(&tgt->tgt_lock);
1258
1259         if (rc)
1260                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1261                         " IO will abort\n");
1262         seq_clnp_req->cb_arg = NULL;
1263         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1264 free_cb_arg:
1265         kfree(cb_arg);
1266         return;
1267 }
1268
1269 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1270                                   struct fcoe_task_ctx_entry *task,
1271                                   u8 num_rq)
1272 {
1273         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1274                               "refcnt = %d, cmd_type = %d\n",
1275                    io_req->refcount.refcount.counter, io_req->cmd_type);
1276         bnx2fc_scsi_done(io_req, DID_ERROR);
1277         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1278 }
1279
1280 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1281                                struct fcoe_task_ctx_entry *task,
1282                                u8 num_rq)
1283 {
1284         u32 r_ctl;
1285         u32 r_a_tov = FC_DEF_R_A_TOV;
1286         u8 issue_rrq = 0;
1287         struct bnx2fc_rport *tgt = io_req->tgt;
1288
1289         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1290                               "refcnt = %d, cmd_type = %d\n",
1291                    io_req->xid,
1292                    io_req->refcount.refcount.counter, io_req->cmd_type);
1293
1294         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1295                                        &io_req->req_flags)) {
1296                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1297                                 " this io\n");
1298                 return;
1299         }
1300
1301         /* Do not issue RRQ as this IO is already cleanedup */
1302         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1303                                 &io_req->req_flags))
1304                 goto io_compl;
1305
1306         /*
1307          * For ABTS issued due to SCSI eh_abort_handler, timeout
1308          * values are maintained by scsi-ml itself. Cancel timeout
1309          * in case ABTS issued as part of task management function
1310          * or due to FW error.
1311          */
1312         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1313                 if (cancel_delayed_work(&io_req->timeout_work))
1314                         kref_put(&io_req->refcount,
1315                                  bnx2fc_cmd_release); /* drop timer hold */
1316
1317         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1318
1319         switch (r_ctl) {
1320         case FC_RCTL_BA_ACC:
1321                 /*
1322                  * Dont release this cmd yet. It will be relesed
1323                  * after we get RRQ response
1324                  */
1325                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1326                 issue_rrq = 1;
1327                 break;
1328
1329         case FC_RCTL_BA_RJT:
1330                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1331                 break;
1332         default:
1333                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1334                 break;
1335         }
1336
1337         if (issue_rrq) {
1338                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1339                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1340         }
1341         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1342         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1343
1344 io_compl:
1345         if (io_req->wait_for_comp) {
1346                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1347                                        &io_req->req_flags))
1348                         complete(&io_req->tm_done);
1349         } else {
1350                 /*
1351                  * We end up here when ABTS is issued as
1352                  * in asynchronous context, i.e., as part
1353                  * of task management completion, or
1354                  * when FW error is received or when the
1355                  * ABTS is issued when the IO is timed
1356                  * out.
1357                  */
1358
1359                 if (io_req->on_active_queue) {
1360                         list_del_init(&io_req->link);
1361                         io_req->on_active_queue = 0;
1362                         /* Move IO req to retire queue */
1363                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1364                 }
1365                 bnx2fc_scsi_done(io_req, DID_ERROR);
1366                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1367         }
1368 }
1369
1370 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1371 {
1372         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1373         struct bnx2fc_rport *tgt = io_req->tgt;
1374         struct list_head *list;
1375         struct list_head *tmp;
1376         struct bnx2fc_cmd *cmd;
1377         int tm_lun = sc_cmd->device->lun;
1378         int rc = 0;
1379         int lun;
1380
1381         /* called with tgt_lock held */
1382         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1383         /*
1384          * Walk thru the active_ios queue and ABORT the IO
1385          * that matches with the LUN that was reset
1386          */
1387         list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1388                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1389                 cmd = (struct bnx2fc_cmd *)list;
1390                 lun = cmd->sc_cmd->device->lun;
1391                 if (lun == tm_lun) {
1392                         /* Initiate ABTS on this cmd */
1393                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1394                                               &cmd->req_flags)) {
1395                                 /* cancel the IO timeout */
1396                                 if (cancel_delayed_work(&io_req->timeout_work))
1397                                         kref_put(&io_req->refcount,
1398                                                  bnx2fc_cmd_release);
1399                                                         /* timer hold */
1400                                 rc = bnx2fc_initiate_abts(cmd);
1401                                 /* abts shouldn't fail in this context */
1402                                 WARN_ON(rc != SUCCESS);
1403                         } else
1404                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1405                                         " progress for this IO 0x%x\n",
1406                                         cmd->xid);
1407                 }
1408         }
1409 }
1410
1411 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1412 {
1413         struct bnx2fc_rport *tgt = io_req->tgt;
1414         struct list_head *list;
1415         struct list_head *tmp;
1416         struct bnx2fc_cmd *cmd;
1417         int rc = 0;
1418
1419         /* called with tgt_lock held */
1420         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1421         /*
1422          * Walk thru the active_ios queue and ABORT the IO
1423          * that matches with the LUN that was reset
1424          */
1425         list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1426                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1427                 cmd = (struct bnx2fc_cmd *)list;
1428                 /* Initiate ABTS */
1429                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1430                                                         &cmd->req_flags)) {
1431                         /* cancel the IO timeout */
1432                         if (cancel_delayed_work(&io_req->timeout_work))
1433                                 kref_put(&io_req->refcount,
1434                                          bnx2fc_cmd_release); /* timer hold */
1435                         rc = bnx2fc_initiate_abts(cmd);
1436                         /* abts shouldn't fail in this context */
1437                         WARN_ON(rc != SUCCESS);
1438
1439                 } else
1440                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1441                                 " for this IO 0x%x\n", cmd->xid);
1442         }
1443 }
1444
1445 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1446                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1447 {
1448         struct bnx2fc_mp_req *tm_req;
1449         struct fc_frame_header *fc_hdr;
1450         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1451         u64 *hdr;
1452         u64 *temp_hdr;
1453         void *rsp_buf;
1454
1455         /* Called with tgt_lock held */
1456         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1457
1458         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1459                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1460         else {
1461                 /* TM has already timed out and we got
1462                  * delayed completion. Ignore completion
1463                  * processing.
1464                  */
1465                 return;
1466         }
1467
1468         tm_req = &(io_req->mp_req);
1469         fc_hdr = &(tm_req->resp_fc_hdr);
1470         hdr = (u64 *)fc_hdr;
1471         temp_hdr = (u64 *)
1472                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1473         hdr[0] = cpu_to_be64(temp_hdr[0]);
1474         hdr[1] = cpu_to_be64(temp_hdr[1]);
1475         hdr[2] = cpu_to_be64(temp_hdr[2]);
1476
1477         tm_req->resp_len =
1478                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1479
1480         rsp_buf = tm_req->resp_buf;
1481
1482         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1483                 bnx2fc_parse_fcp_rsp(io_req,
1484                                      (struct fcoe_fcp_rsp_payload *)
1485                                      rsp_buf, num_rq);
1486                 if (io_req->fcp_rsp_code == 0) {
1487                         /* TM successful */
1488                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1489                                 bnx2fc_lun_reset_cmpl(io_req);
1490                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1491                                 bnx2fc_tgt_reset_cmpl(io_req);
1492                 }
1493         } else {
1494                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1495                         fc_hdr->fh_r_ctl);
1496         }
1497         if (!sc_cmd->SCp.ptr) {
1498                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1499                 return;
1500         }
1501         switch (io_req->fcp_status) {
1502         case FC_GOOD:
1503                 if (io_req->cdb_status == 0) {
1504                         /* Good IO completion */
1505                         sc_cmd->result = DID_OK << 16;
1506                 } else {
1507                         /* Transport status is good, SCSI status not good */
1508                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1509                 }
1510                 if (io_req->fcp_resid)
1511                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1512                 break;
1513
1514         default:
1515                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1516                            io_req->fcp_status);
1517                 break;
1518         }
1519
1520         sc_cmd = io_req->sc_cmd;
1521         io_req->sc_cmd = NULL;
1522
1523         /* check if the io_req exists in tgt's tmf_q */
1524         if (io_req->on_tmf_queue) {
1525
1526                 list_del_init(&io_req->link);
1527                 io_req->on_tmf_queue = 0;
1528         } else {
1529
1530                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1531                 return;
1532         }
1533
1534         sc_cmd->SCp.ptr = NULL;
1535         sc_cmd->scsi_done(sc_cmd);
1536
1537         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1538         if (io_req->wait_for_comp) {
1539                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1540                 complete(&io_req->tm_done);
1541         }
1542 }
1543
1544 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1545                            int bd_index)
1546 {
1547         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1548         int frag_size, sg_frags;
1549
1550         sg_frags = 0;
1551         while (sg_len) {
1552                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1553                         frag_size = BNX2FC_BD_SPLIT_SZ;
1554                 else
1555                         frag_size = sg_len;
1556                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1557                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1558                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1559                 bd[bd_index + sg_frags].flags = 0;
1560
1561                 addr += (u64) frag_size;
1562                 sg_frags++;
1563                 sg_len -= frag_size;
1564         }
1565         return sg_frags;
1566
1567 }
1568
1569 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1570 {
1571         struct bnx2fc_interface *interface = io_req->port->priv;
1572         struct bnx2fc_hba *hba = interface->hba;
1573         struct scsi_cmnd *sc = io_req->sc_cmd;
1574         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1575         struct scatterlist *sg;
1576         int byte_count = 0;
1577         int sg_count = 0;
1578         int bd_count = 0;
1579         int sg_frags;
1580         unsigned int sg_len;
1581         u64 addr;
1582         int i;
1583
1584         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1585                               scsi_sg_count(sc), sc->sc_data_direction);
1586         scsi_for_each_sg(sc, sg, sg_count, i) {
1587                 sg_len = sg_dma_len(sg);
1588                 addr = sg_dma_address(sg);
1589                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1590                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1591                                                    bd_count);
1592                 } else {
1593
1594                         sg_frags = 1;
1595                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1596                         bd[bd_count].buf_addr_hi  = addr >> 32;
1597                         bd[bd_count].buf_len = (u16)sg_len;
1598                         bd[bd_count].flags = 0;
1599                 }
1600                 bd_count += sg_frags;
1601                 byte_count += sg_len;
1602         }
1603         if (byte_count != scsi_bufflen(sc))
1604                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1605                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1606                         io_req->xid);
1607         return bd_count;
1608 }
1609
1610 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1611 {
1612         struct scsi_cmnd *sc = io_req->sc_cmd;
1613         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1614         int bd_count;
1615
1616         if (scsi_sg_count(sc)) {
1617                 bd_count = bnx2fc_map_sg(io_req);
1618                 if (bd_count == 0)
1619                         return -ENOMEM;
1620         } else {
1621                 bd_count = 0;
1622                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1623                 bd[0].buf_len = bd[0].flags = 0;
1624         }
1625         io_req->bd_tbl->bd_valid = bd_count;
1626
1627         return 0;
1628 }
1629
1630 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1631 {
1632         struct scsi_cmnd *sc = io_req->sc_cmd;
1633
1634         if (io_req->bd_tbl->bd_valid && sc) {
1635                 scsi_dma_unmap(sc);
1636                 io_req->bd_tbl->bd_valid = 0;
1637         }
1638 }
1639
1640 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1641                                   struct fcp_cmnd *fcp_cmnd)
1642 {
1643         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1644         char tag[2];
1645
1646         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1647
1648         int_to_scsilun(sc_cmd->device->lun,
1649                         (struct scsi_lun *) fcp_cmnd->fc_lun);
1650
1651
1652         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1653         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1654
1655         fcp_cmnd->fc_cmdref = 0;
1656         fcp_cmnd->fc_pri_ta = 0;
1657         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1658         fcp_cmnd->fc_flags = io_req->io_req_flags;
1659
1660         if (scsi_populate_tag_msg(sc_cmd, tag)) {
1661                 switch (tag[0]) {
1662                 case HEAD_OF_QUEUE_TAG:
1663                         fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1664                         break;
1665                 case ORDERED_QUEUE_TAG:
1666                         fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1667                         break;
1668                 default:
1669                         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1670                         break;
1671                 }
1672         } else {
1673                 fcp_cmnd->fc_pri_ta = 0;
1674         }
1675 }
1676
1677 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1678                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1679                                  u8 num_rq)
1680 {
1681         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1682         struct bnx2fc_rport *tgt = io_req->tgt;
1683         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1684         u32 rq_buff_len = 0;
1685         int i;
1686         unsigned char *rq_data;
1687         unsigned char *dummy;
1688         int fcp_sns_len = 0;
1689         int fcp_rsp_len = 0;
1690
1691         io_req->fcp_status = FC_GOOD;
1692         io_req->fcp_resid = fcp_rsp->fcp_resid;
1693
1694         io_req->scsi_comp_flags = rsp_flags;
1695         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1696                                 fcp_rsp->scsi_status_code;
1697
1698         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1699         if (num_rq) {
1700
1701                 /*
1702                  * We do not anticipate num_rq >1, as the linux defined
1703                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1704                  * 256 bytes of single rq buffer is good enough to hold this.
1705                  */
1706
1707                 if (rsp_flags &
1708                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1709                         fcp_rsp_len = rq_buff_len
1710                                         = fcp_rsp->fcp_rsp_len;
1711                 }
1712
1713                 if (rsp_flags &
1714                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1715                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1716                         rq_buff_len += fcp_rsp->fcp_sns_len;
1717                 }
1718
1719                 io_req->fcp_rsp_len = fcp_rsp_len;
1720                 io_req->fcp_sns_len = fcp_sns_len;
1721
1722                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1723                         /* Invalid sense sense length. */
1724                         printk(KERN_ERR PFX "invalid sns length %d\n",
1725                                 rq_buff_len);
1726                         /* reset rq_buff_len */
1727                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1728                 }
1729
1730                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1731
1732                 if (num_rq > 1) {
1733                         /* We do not need extra sense data */
1734                         for (i = 1; i < num_rq; i++)
1735                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1736                 }
1737
1738                 /* fetch fcp_rsp_code */
1739                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1740                         /* Only for task management function */
1741                         io_req->fcp_rsp_code = rq_data[3];
1742                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1743                                 io_req->fcp_rsp_code);
1744                 }
1745
1746                 /* fetch sense data */
1747                 rq_data += fcp_rsp_len;
1748
1749                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1750                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1751                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1752                 }
1753
1754                 memset(sc_cmd->sense_buffer, 0, sizeof(sc_cmd->sense_buffer));
1755                 if (fcp_sns_len)
1756                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1757
1758                 /* return RQ entries */
1759                 for (i = 0; i < num_rq; i++)
1760                         bnx2fc_return_rqe(tgt, 1);
1761         }
1762 }
1763
1764 /**
1765  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1766  *
1767  * @host:       The Scsi_Host the command was issued to
1768  * @sc_cmd:     struct scsi_cmnd to be executed
1769  *
1770  * This is the IO strategy routine, called by SCSI-ML
1771  **/
1772 int bnx2fc_queuecommand(struct Scsi_Host *host,
1773                         struct scsi_cmnd *sc_cmd)
1774 {
1775         struct fc_lport *lport = shost_priv(host);
1776         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1777         struct fc_rport_libfc_priv *rp = rport->dd_data;
1778         struct bnx2fc_rport *tgt;
1779         struct bnx2fc_cmd *io_req;
1780         int rc = 0;
1781         int rval;
1782
1783         rval = fc_remote_port_chkready(rport);
1784         if (rval) {
1785                 sc_cmd->result = rval;
1786                 sc_cmd->scsi_done(sc_cmd);
1787                 return 0;
1788         }
1789
1790         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1791                 rc = SCSI_MLQUEUE_HOST_BUSY;
1792                 goto exit_qcmd;
1793         }
1794
1795         /* rport and tgt are allocated together, so tgt should be non-NULL */
1796         tgt = (struct bnx2fc_rport *)&rp[1];
1797
1798         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1799                 /*
1800                  * Session is not offloaded yet. Let SCSI-ml retry
1801                  * the command.
1802                  */
1803                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1804                 goto exit_qcmd;
1805         }
1806
1807         io_req = bnx2fc_cmd_alloc(tgt);
1808         if (!io_req) {
1809                 rc = SCSI_MLQUEUE_HOST_BUSY;
1810                 goto exit_qcmd;
1811         }
1812         io_req->sc_cmd = sc_cmd;
1813
1814         if (bnx2fc_post_io_req(tgt, io_req)) {
1815                 printk(KERN_ERR PFX "Unable to post io_req\n");
1816                 rc = SCSI_MLQUEUE_HOST_BUSY;
1817                 goto exit_qcmd;
1818         }
1819 exit_qcmd:
1820         return rc;
1821 }
1822
1823 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1824                                    struct fcoe_task_ctx_entry *task,
1825                                    u8 num_rq)
1826 {
1827         struct fcoe_fcp_rsp_payload *fcp_rsp;
1828         struct bnx2fc_rport *tgt = io_req->tgt;
1829         struct scsi_cmnd *sc_cmd;
1830         struct Scsi_Host *host;
1831
1832
1833         /* scsi_cmd_cmpl is called with tgt lock held */
1834
1835         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1836                 /* we will not receive ABTS response for this IO */
1837                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1838                            "this scsi cmd\n");
1839         }
1840
1841         /* Cancel the timeout_work, as we received IO completion */
1842         if (cancel_delayed_work(&io_req->timeout_work))
1843                 kref_put(&io_req->refcount,
1844                          bnx2fc_cmd_release); /* drop timer hold */
1845
1846         sc_cmd = io_req->sc_cmd;
1847         if (sc_cmd == NULL) {
1848                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1849                 return;
1850         }
1851
1852         /* Fetch fcp_rsp from task context and perform cmd completion */
1853         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1854                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1855
1856         /* parse fcp_rsp and obtain sense data from RQ if available */
1857         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1858
1859         host = sc_cmd->device->host;
1860         if (!sc_cmd->SCp.ptr) {
1861                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1862                 return;
1863         }
1864
1865         if (io_req->on_active_queue) {
1866                 list_del_init(&io_req->link);
1867                 io_req->on_active_queue = 0;
1868                 /* Move IO req to retire queue */
1869                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1870         } else {
1871                 /* This should not happen, but could have been pulled
1872                  * by bnx2fc_flush_active_ios(), or during a race
1873                  * between command abort and (late) completion.
1874                  */
1875                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1876                 if (io_req->wait_for_comp)
1877                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1878                                                &io_req->req_flags))
1879                                 complete(&io_req->tm_done);
1880         }
1881
1882         bnx2fc_unmap_sg_list(io_req);
1883         io_req->sc_cmd = NULL;
1884
1885         switch (io_req->fcp_status) {
1886         case FC_GOOD:
1887                 if (io_req->cdb_status == 0) {
1888                         /* Good IO completion */
1889                         sc_cmd->result = DID_OK << 16;
1890                 } else {
1891                         /* Transport status is good, SCSI status not good */
1892                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1893                                  " fcp_resid = 0x%x\n",
1894                                 io_req->cdb_status, io_req->fcp_resid);
1895                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1896                 }
1897                 if (io_req->fcp_resid)
1898                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1899                 break;
1900         default:
1901                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1902                         io_req->fcp_status);
1903                 break;
1904         }
1905         sc_cmd->SCp.ptr = NULL;
1906         sc_cmd->scsi_done(sc_cmd);
1907         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1908 }
1909
1910 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1911                                struct bnx2fc_cmd *io_req)
1912 {
1913         struct fcoe_task_ctx_entry *task;
1914         struct fcoe_task_ctx_entry *task_page;
1915         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1916         struct fcoe_port *port = tgt->port;
1917         struct bnx2fc_interface *interface = port->priv;
1918         struct bnx2fc_hba *hba = interface->hba;
1919         struct fc_lport *lport = port->lport;
1920         struct fcoe_dev_stats *stats;
1921         int task_idx, index;
1922         u16 xid;
1923
1924         /* Initialize rest of io_req fields */
1925         io_req->cmd_type = BNX2FC_SCSI_CMD;
1926         io_req->port = port;
1927         io_req->tgt = tgt;
1928         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1929         sc_cmd->SCp.ptr = (char *)io_req;
1930
1931         stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1932         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1933                 io_req->io_req_flags = BNX2FC_READ;
1934                 stats->InputRequests++;
1935                 stats->InputBytes += io_req->data_xfer_len;
1936         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1937                 io_req->io_req_flags = BNX2FC_WRITE;
1938                 stats->OutputRequests++;
1939                 stats->OutputBytes += io_req->data_xfer_len;
1940         } else {
1941                 io_req->io_req_flags = 0;
1942                 stats->ControlRequests++;
1943         }
1944         put_cpu();
1945
1946         xid = io_req->xid;
1947
1948         /* Build buffer descriptor list for firmware from sg list */
1949         if (bnx2fc_build_bd_list_from_sg(io_req)) {
1950                 printk(KERN_ERR PFX "BD list creation failed\n");
1951                 spin_lock_bh(&tgt->tgt_lock);
1952                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1953                 spin_unlock_bh(&tgt->tgt_lock);
1954                 return -EAGAIN;
1955         }
1956
1957         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
1958         index = xid % BNX2FC_TASKS_PER_PAGE;
1959
1960         /* Initialize task context for this IO request */
1961         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
1962         task = &(task_page[index]);
1963         bnx2fc_init_task(io_req, task);
1964
1965         spin_lock_bh(&tgt->tgt_lock);
1966
1967         if (tgt->flush_in_prog) {
1968                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
1969                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1970                 spin_unlock_bh(&tgt->tgt_lock);
1971                 return -EAGAIN;
1972         }
1973
1974         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1975                 printk(KERN_ERR PFX "Session not ready...post_io\n");
1976                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1977                 spin_unlock_bh(&tgt->tgt_lock);
1978                 return -EAGAIN;
1979         }
1980
1981         /* Time IO req */
1982         if (tgt->io_timeout)
1983                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
1984         /* Obtain free SQ entry */
1985         bnx2fc_add_2_sq(tgt, xid);
1986
1987         /* Enqueue the io_req to active_cmd_queue */
1988
1989         io_req->on_active_queue = 1;
1990         /* move io_req from pending_queue to active_queue */
1991         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
1992
1993         /* Ring doorbell */
1994         bnx2fc_ring_doorbell(tgt);
1995         spin_unlock_bh(&tgt->tgt_lock);
1996         return 0;
1997 }