drivers/scsi/bnx2fc/bnx2fc_io.c

   1 /* bnx2fc_io.c: QLogic Linux FCoE offload driver.
   2  * IO manager and SCSI IO processing.
   3  *
   4  * Copyright (c) 2008-2013 Broadcom Corporation
   5  * Copyright (c) 2014-2016 QLogic Corporation
   6  * Copyright (c) 2016-2017 Cavium Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation.
  11  *
  12  * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  13  */
  14
  15 #include "bnx2fc.h"
  16
  17 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  18
  19 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  20                            int bd_index);
  21 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  22 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  23 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  24 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  25 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  26                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
  27                                  u8 num_rq);
  28
  29 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  30                           unsigned int timer_msec)
  31 {
  32         struct bnx2fc_interface *interface = io_req->port->priv;
  33
  34         if (queue_delayed_work(interface->timer_work_queue,
  35                                &io_req->timeout_work,
  36                                msecs_to_jiffies(timer_msec)))
  37                 kref_get(&io_req->refcount);
  38 }
  39
  40 static void bnx2fc_cmd_timeout(struct work_struct *work)
  41 {
  42         struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  43                                                  timeout_work.work);
  44         u8 cmd_type = io_req->cmd_type;
  45         struct bnx2fc_rport *tgt = io_req->tgt;
  46         int rc;
  47
  48         BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  49                       "req_flags = %lx\n", cmd_type, io_req->req_flags);
  50
  51         spin_lock_bh(&tgt->tgt_lock);
  52         if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  53                 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  54                 /*
  55                  * ideally we should hold the io_req until RRQ complets,
  56                  * and release io_req from timeout hold.
  57                  */
  58                 spin_unlock_bh(&tgt->tgt_lock);
  59                 bnx2fc_send_rrq(io_req);
  60                 return;
  61         }
  62         if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  63                 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
  64                 goto done;
  65         }
  66
  67         switch (cmd_type) {
  68         case BNX2FC_SCSI_CMD:
  69                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  70                                                         &io_req->req_flags)) {
  71                         /* Handle eh_abort timeout */
  72                         BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
  73                         complete(&io_req->abts_done);
  74                 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  75                                     &io_req->req_flags)) {
  76                         /* Handle internally generated ABTS timeout */
  77                         BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
  78                                         kref_read(&io_req->refcount));
  79                         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  80                                                &io_req->req_flags))) {
  81                                 /*
  82                                  * Cleanup and return original command to
  83                                  * mid-layer.
  84                                  */
  85                                 bnx2fc_initiate_cleanup(io_req);
  86                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
  87                                 spin_unlock_bh(&tgt->tgt_lock);
  88
  89                                 return;
  90                         }
  91                 } else {
  92                         /* Hanlde IO timeout */
  93                         BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
  94                         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
  95                                              &io_req->req_flags)) {
  96                                 BNX2FC_IO_DBG(io_req, "IO completed before "
  97                                                            " timer expiry\n");
  98                                 goto done;
  99                         }
 100
 101                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
 102                                               &io_req->req_flags)) {
 103                                 rc = bnx2fc_initiate_abts(io_req);
 104                                 if (rc == SUCCESS)
 105                                         goto done;
 106
 107                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 108                                 spin_unlock_bh(&tgt->tgt_lock);
 109
 110                                 return;
 111                         } else {
 112                                 BNX2FC_IO_DBG(io_req, "IO already in "
 113                                                       "ABTS processing\n");
 114                         }
 115                 }
 116                 break;
 117         case BNX2FC_ELS:
 118
 119                 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
 120                         BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
 121
 122                         if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
 123                                               &io_req->req_flags)) {
 124                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 125                                 spin_unlock_bh(&tgt->tgt_lock);
 126
 127                                 return;
 128                         }
 129                 } else {
 130                         /*
 131                          * Handle ELS timeout.
 132                          * tgt_lock is used to sync compl path and timeout
 133                          * path. If els compl path is processing this IO, we
 134                          * have nothing to do here, just release the timer hold
 135                          */
 136                         BNX2FC_IO_DBG(io_req, "ELS timed out\n");
 137                         if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
 138                                                &io_req->req_flags))
 139                                 goto done;
 140
 141                         /* Indicate the cb_func that this ELS is timed out */
 142                         set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
 143
 144                         if ((io_req->cb_func) && (io_req->cb_arg)) {
 145                                 io_req->cb_func(io_req->cb_arg);
 146                                 io_req->cb_arg = NULL;
 147                         }
 148                 }
 149                 break;
 150         default:
 151                 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
 152                         cmd_type);
 153                 break;
 154         }
 155
 156 done:
 157         /* release the cmd that was held when timer was set */
 158         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 159         spin_unlock_bh(&tgt->tgt_lock);
 160 }
 161
 162 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
 163 {
 164         /* Called with host lock held */
 165         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 166
 167         /*
 168          * active_cmd_queue may have other command types as well,
 169          * and during flush operation,  we want to error back only
 170          * scsi commands.
 171          */
 172         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 173                 return;
 174
 175         BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
 176         if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
 177                 /* Do not call scsi done for this IO */
 178                 return;
 179         }
 180
 181         bnx2fc_unmap_sg_list(io_req);
 182         io_req->sc_cmd = NULL;
 183
 184         /* Sanity checks before returning command to mid-layer */
 185         if (!sc_cmd) {
 186                 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
 187                                     "IO(0x%x) already cleaned up\n",
 188                        io_req->xid);
 189                 return;
 190         }
 191         if (!sc_cmd->device) {
 192                 pr_err(PFX "0x%x: sc_cmd->device is NULL.\n", io_req->xid);
 193                 return;
 194         }
 195         if (!sc_cmd->device->host) {
 196                 pr_err(PFX "0x%x: sc_cmd->device->host is NULL.\n",
 197                     io_req->xid);
 198                 return;
 199         }
 200
 201         sc_cmd->result = err_code << 16;
 202
 203         BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
 204                 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
 205                 sc_cmd->allowed);
 206         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
 207         sc_cmd->SCp.ptr = NULL;
 208         sc_cmd->scsi_done(sc_cmd);
 209 }
 210
 211 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 212 {
 213         struct bnx2fc_cmd_mgr *cmgr;
 214         struct io_bdt *bdt_info;
 215         struct bnx2fc_cmd *io_req;
 216         size_t len;
 217         u32 mem_size;
 218         u16 xid;
 219         int i;
 220         int num_ios, num_pri_ios;
 221         size_t bd_tbl_sz;
 222         int arr_sz = num_possible_cpus() + 1;
 223         u16 min_xid = BNX2FC_MIN_XID;
 224         u16 max_xid = hba->max_xid;
 225
 226         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 227                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 228                                         and max_xid 0x%x\n", min_xid, max_xid);
 229                 return NULL;
 230         }
 231         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 232
 233         num_ios = max_xid - min_xid + 1;
 234         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 235         len += sizeof(struct bnx2fc_cmd_mgr);
 236
 237         cmgr = kzalloc(len, GFP_KERNEL);
 238         if (!cmgr) {
 239                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
 240                 return NULL;
 241         }
 242
 243         cmgr->hba = hba;
 244         cmgr->free_list = kcalloc(arr_sz, sizeof(*cmgr->free_list),
 245                                   GFP_KERNEL);
 246         if (!cmgr->free_list) {
 247                 printk(KERN_ERR PFX "failed to alloc free_list\n");
 248                 goto mem_err;
 249         }
 250
 251         cmgr->free_list_lock = kcalloc(arr_sz, sizeof(*cmgr->free_list_lock),
 252                                        GFP_KERNEL);
 253         if (!cmgr->free_list_lock) {
 254                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 255                 kfree(cmgr->free_list);
 256                 cmgr->free_list = NULL;
 257                 goto mem_err;
 258         }
 259
 260         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 261
 262         for (i = 0; i < arr_sz; i++)  {
 263                 INIT_LIST_HEAD(&cmgr->free_list[i]);
 264                 spin_lock_init(&cmgr->free_list_lock[i]);
 265         }
 266
 267         /*
 268          * Pre-allocated pool of bnx2fc_cmds.
 269          * Last entry in the free list array is the free list
 270          * of slow path requests.
 271          */
 272         xid = BNX2FC_MIN_XID;
 273         num_pri_ios = num_ios - hba->elstm_xids;
 274         for (i = 0; i < num_ios; i++) {
 275                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 276
 277                 if (!io_req) {
 278                         printk(KERN_ERR PFX "failed to alloc io_req\n");
 279                         goto mem_err;
 280                 }
 281
 282                 INIT_LIST_HEAD(&io_req->link);
 283                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 284
 285                 io_req->xid = xid++;
 286                 if (i < num_pri_ios)
 287                         list_add_tail(&io_req->link,
 288                                 &cmgr->free_list[io_req->xid %
 289                                                  num_possible_cpus()]);
 290                 else
 291                         list_add_tail(&io_req->link,
 292                                 &cmgr->free_list[num_possible_cpus()]);
 293                 io_req++;
 294         }
 295
 296         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 297         mem_size = num_ios * sizeof(struct io_bdt *);
 298         cmgr->io_bdt_pool = kzalloc(mem_size, GFP_KERNEL);
 299         if (!cmgr->io_bdt_pool) {
 300                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 301                 goto mem_err;
 302         }
 303
 304         mem_size = sizeof(struct io_bdt);
 305         for (i = 0; i < num_ios; i++) {
 306                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 307                 if (!cmgr->io_bdt_pool[i]) {
 308                         printk(KERN_ERR PFX "failed to alloc "
 309                                 "io_bdt_pool[%d]\n", i);
 310                         goto mem_err;
 311                 }
 312         }
 313
 314         /* Allocate an map fcoe_bdt_ctx structures */
 315         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 316         for (i = 0; i < num_ios; i++) {
 317                 bdt_info = cmgr->io_bdt_pool[i];
 318                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 319                                                       bd_tbl_sz,
 320                                                       &bdt_info->bd_tbl_dma,
 321                                                       GFP_KERNEL);
 322                 if (!bdt_info->bd_tbl) {
 323                         printk(KERN_ERR PFX "failed to alloc "
 324                                 "bdt_tbl[%d]\n", i);
 325                         goto mem_err;
 326                 }
 327         }
 328
 329         return cmgr;
 330
 331 mem_err:
 332         bnx2fc_cmd_mgr_free(cmgr);
 333         return NULL;
 334 }
 335
 336 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 337 {
 338         struct io_bdt *bdt_info;
 339         struct bnx2fc_hba *hba = cmgr->hba;
 340         size_t bd_tbl_sz;
 341         u16 min_xid = BNX2FC_MIN_XID;
 342         u16 max_xid = hba->max_xid;
 343         int num_ios;
 344         int i;
 345
 346         num_ios = max_xid - min_xid + 1;
 347
 348         /* Free fcoe_bdt_ctx structures */
 349         if (!cmgr->io_bdt_pool)
 350                 goto free_cmd_pool;
 351
 352         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 353         for (i = 0; i < num_ios; i++) {
 354                 bdt_info = cmgr->io_bdt_pool[i];
 355                 if (bdt_info->bd_tbl) {
 356                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 357                                             bdt_info->bd_tbl,
 358                                             bdt_info->bd_tbl_dma);
 359                         bdt_info->bd_tbl = NULL;
 360                 }
 361         }
 362
 363         /* Destroy io_bdt pool */
 364         for (i = 0; i < num_ios; i++) {
 365                 kfree(cmgr->io_bdt_pool[i]);
 366                 cmgr->io_bdt_pool[i] = NULL;
 367         }
 368
 369         kfree(cmgr->io_bdt_pool);
 370         cmgr->io_bdt_pool = NULL;
 371
 372 free_cmd_pool:
 373         kfree(cmgr->free_list_lock);
 374
 375         /* Destroy cmd pool */
 376         if (!cmgr->free_list)
 377                 goto free_cmgr;
 378
 379         for (i = 0; i < num_possible_cpus() + 1; i++)  {
 380                 struct bnx2fc_cmd *tmp, *io_req;
 381
 382                 list_for_each_entry_safe(io_req, tmp,
 383                                          &cmgr->free_list[i], link) {
 384                         list_del(&io_req->link);
 385                         kfree(io_req);
 386                 }
 387         }
 388         kfree(cmgr->free_list);
 389 free_cmgr:
 390         /* Free command manager itself */
 391         kfree(cmgr);
 392 }
 393
 394 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 395 {
 396         struct fcoe_port *port = tgt->port;
 397         struct bnx2fc_interface *interface = port->priv;
 398         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 399         struct bnx2fc_cmd *io_req;
 400         struct list_head *listp;
 401         struct io_bdt *bd_tbl;
 402         int index = RESERVE_FREE_LIST_INDEX;
 403         u32 free_sqes;
 404         u32 max_sqes;
 405         u16 xid;
 406
 407         max_sqes = tgt->max_sqes;
 408         switch (type) {
 409         case BNX2FC_TASK_MGMT_CMD:
 410                 max_sqes = BNX2FC_TM_MAX_SQES;
 411                 break;
 412         case BNX2FC_ELS:
 413                 max_sqes = BNX2FC_ELS_MAX_SQES;
 414                 break;
 415         default:
 416                 break;
 417         }
 418
 419         /*
 420          * NOTE: Free list insertions and deletions are protected with
 421          * cmgr lock
 422          */
 423         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 424         free_sqes = atomic_read(&tgt->free_sqes);
 425         if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 426             (tgt->num_active_ios.counter  >= max_sqes) ||
 427             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 428                 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 429                         "ios(%d):sqes(%d)\n",
 430                         tgt->num_active_ios.counter, tgt->max_sqes);
 431                 if (list_empty(&(cmd_mgr->free_list[index])))
 432                         printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 433                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 434                 return NULL;
 435         }
 436
 437         listp = (struct list_head *)
 438                         cmd_mgr->free_list[index].next;
 439         list_del_init(listp);
 440         io_req = (struct bnx2fc_cmd *) listp;
 441         xid = io_req->xid;
 442         cmd_mgr->cmds[xid] = io_req;
 443         atomic_inc(&tgt->num_active_ios);
 444         atomic_dec(&tgt->free_sqes);
 445         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 446
 447         INIT_LIST_HEAD(&io_req->link);
 448
 449         io_req->port = port;
 450         io_req->cmd_mgr = cmd_mgr;
 451         io_req->req_flags = 0;
 452         io_req->cmd_type = type;
 453
 454         /* Bind io_bdt for this io_req */
 455         /* Have a static link between io_req and io_bdt_pool */
 456         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 457         bd_tbl->io_req = io_req;
 458
 459         /* Hold the io_req  against deletion */
 460         kref_init(&io_req->refcount);
 461         return io_req;
 462 }
 463
 464 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 465 {
 466         struct fcoe_port *port = tgt->port;
 467         struct bnx2fc_interface *interface = port->priv;
 468         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 469         struct bnx2fc_cmd *io_req;
 470         struct list_head *listp;
 471         struct io_bdt *bd_tbl;
 472         u32 free_sqes;
 473         u32 max_sqes;
 474         u16 xid;
 475         int index = get_cpu();
 476
 477         max_sqes = BNX2FC_SCSI_MAX_SQES;
 478         /*
 479          * NOTE: Free list insertions and deletions are protected with
 480          * cmgr lock
 481          */
 482         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 483         free_sqes = atomic_read(&tgt->free_sqes);
 484         if ((list_empty(&cmd_mgr->free_list[index])) ||
 485             (tgt->num_active_ios.counter  >= max_sqes) ||
 486             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 487                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 488                 put_cpu();
 489                 return NULL;
 490         }
 491
 492         listp = (struct list_head *)
 493                 cmd_mgr->free_list[index].next;
 494         list_del_init(listp);
 495         io_req = (struct bnx2fc_cmd *) listp;
 496         xid = io_req->xid;
 497         cmd_mgr->cmds[xid] = io_req;
 498         atomic_inc(&tgt->num_active_ios);
 499         atomic_dec(&tgt->free_sqes);
 500         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 501         put_cpu();
 502
 503         INIT_LIST_HEAD(&io_req->link);
 504
 505         io_req->port = port;
 506         io_req->cmd_mgr = cmd_mgr;
 507         io_req->req_flags = 0;
 508
 509         /* Bind io_bdt for this io_req */
 510         /* Have a static link between io_req and io_bdt_pool */
 511         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 512         bd_tbl->io_req = io_req;
 513
 514         /* Hold the io_req  against deletion */
 515         kref_init(&io_req->refcount);
 516         return io_req;
 517 }
 518
 519 void bnx2fc_cmd_release(struct kref *ref)
 520 {
 521         struct bnx2fc_cmd *io_req = container_of(ref,
 522                                                 struct bnx2fc_cmd, refcount);
 523         struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 524         int index;
 525
 526         if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 527                 index = io_req->xid % num_possible_cpus();
 528         else
 529                 index = RESERVE_FREE_LIST_INDEX;
 530
 531
 532         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 533         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 534                 bnx2fc_free_mp_resc(io_req);
 535         cmd_mgr->cmds[io_req->xid] = NULL;
 536         /* Delete IO from retire queue */
 537         list_del_init(&io_req->link);
 538         /* Add it to the free list */
 539         list_add(&io_req->link,
 540                         &cmd_mgr->free_list[index]);
 541         atomic_dec(&io_req->tgt->num_active_ios);
 542         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 543
 544 }
 545
 546 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 547 {
 548         struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 549         struct bnx2fc_interface *interface = io_req->port->priv;
 550         struct bnx2fc_hba *hba = interface->hba;
 551         size_t sz = sizeof(struct fcoe_bd_ctx);
 552
 553         /* clear tm flags */
 554         mp_req->tm_flags = 0;
 555         if (mp_req->mp_req_bd) {
 556                 dma_free_coherent(&hba->pcidev->dev, sz,
 557                                      mp_req->mp_req_bd,
 558                                      mp_req->mp_req_bd_dma);
 559                 mp_req->mp_req_bd = NULL;
 560         }
 561         if (mp_req->mp_resp_bd) {
 562                 dma_free_coherent(&hba->pcidev->dev, sz,
 563                                      mp_req->mp_resp_bd,
 564                                      mp_req->mp_resp_bd_dma);
 565                 mp_req->mp_resp_bd = NULL;
 566         }
 567         if (mp_req->req_buf) {
 568                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 569                                      mp_req->req_buf,
 570                                      mp_req->req_buf_dma);
 571                 mp_req->req_buf = NULL;
 572         }
 573         if (mp_req->resp_buf) {
 574                 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 575                                      mp_req->resp_buf,
 576                                      mp_req->resp_buf_dma);
 577                 mp_req->resp_buf = NULL;
 578         }
 579 }
 580
 581 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 582 {
 583         struct bnx2fc_mp_req *mp_req;
 584         struct fcoe_bd_ctx *mp_req_bd;
 585         struct fcoe_bd_ctx *mp_resp_bd;
 586         struct bnx2fc_interface *interface = io_req->port->priv;
 587         struct bnx2fc_hba *hba = interface->hba;
 588         dma_addr_t addr;
 589         size_t sz;
 590
 591         mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 592         memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 593
 594         if (io_req->cmd_type != BNX2FC_ELS) {
 595                 mp_req->req_len = sizeof(struct fcp_cmnd);
 596                 io_req->data_xfer_len = mp_req->req_len;
 597         } else
 598                 mp_req->req_len = io_req->data_xfer_len;
 599
 600         mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 601                                              &mp_req->req_buf_dma,
 602                                              GFP_ATOMIC);
 603         if (!mp_req->req_buf) {
 604                 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 605                 bnx2fc_free_mp_resc(io_req);
 606                 return FAILED;
 607         }
 608
 609         mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
 610                                               &mp_req->resp_buf_dma,
 611                                               GFP_ATOMIC);
 612         if (!mp_req->resp_buf) {
 613                 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 614                 bnx2fc_free_mp_resc(io_req);
 615                 return FAILED;
 616         }
 617         memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
 618         memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
 619
 620         /* Allocate and map mp_req_bd and mp_resp_bd */
 621         sz = sizeof(struct fcoe_bd_ctx);
 622         mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 623                                                  &mp_req->mp_req_bd_dma,
 624                                                  GFP_ATOMIC);
 625         if (!mp_req->mp_req_bd) {
 626                 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 627                 bnx2fc_free_mp_resc(io_req);
 628                 return FAILED;
 629         }
 630         mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 631                                                  &mp_req->mp_resp_bd_dma,
 632                                                  GFP_ATOMIC);
 633         if (!mp_req->mp_resp_bd) {
 634                 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 635                 bnx2fc_free_mp_resc(io_req);
 636                 return FAILED;
 637         }
 638         /* Fill bd table */
 639         addr = mp_req->req_buf_dma;
 640         mp_req_bd = mp_req->mp_req_bd;
 641         mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 642         mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 643         mp_req_bd->buf_len = CNIC_PAGE_SIZE;
 644         mp_req_bd->flags = 0;
 645
 646         /*
 647          * MP buffer is either a task mgmt command or an ELS.
 648          * So the assumption is that it consumes a single bd
 649          * entry in the bd table
 650          */
 651         mp_resp_bd = mp_req->mp_resp_bd;
 652         addr = mp_req->resp_buf_dma;
 653         mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 654         mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 655         mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
 656         mp_resp_bd->flags = 0;
 657
 658         return SUCCESS;
 659 }
 660
 661 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 662 {
 663         struct fc_lport *lport;
 664         struct fc_rport *rport;
 665         struct fc_rport_libfc_priv *rp;
 666         struct fcoe_port *port;
 667         struct bnx2fc_interface *interface;
 668         struct bnx2fc_rport *tgt;
 669         struct bnx2fc_cmd *io_req;
 670         struct bnx2fc_mp_req *tm_req;
 671         struct fcoe_task_ctx_entry *task;
 672         struct fcoe_task_ctx_entry *task_page;
 673         struct Scsi_Host *host = sc_cmd->device->host;
 674         struct fc_frame_header *fc_hdr;
 675         struct fcp_cmnd *fcp_cmnd;
 676         int task_idx, index;
 677         int rc = SUCCESS;
 678         u16 xid;
 679         u32 sid, did;
 680         unsigned long start = jiffies;
 681
 682         lport = shost_priv(host);
 683         rport = starget_to_rport(scsi_target(sc_cmd->device));
 684         port = lport_priv(lport);
 685         interface = port->priv;
 686
 687         if (rport == NULL) {
 688                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 689                 rc = FAILED;
 690                 goto tmf_err;
 691         }
 692         rp = rport->dd_data;
 693
 694         rc = fc_block_scsi_eh(sc_cmd);
 695         if (rc)
 696                 return rc;
 697
 698         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 699                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
 700                 rc = FAILED;
 701                 goto tmf_err;
 702         }
 703         /* rport and tgt are allocated together, so tgt should be non-NULL */
 704         tgt = (struct bnx2fc_rport *)&rp[1];
 705
 706         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 707                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 708                 rc = FAILED;
 709                 goto tmf_err;
 710         }
 711 retry_tmf:
 712         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 713         if (!io_req) {
 714                 if (time_after(jiffies, start + HZ)) {
 715                         printk(KERN_ERR PFX "tmf: Failed TMF");
 716                         rc = FAILED;
 717                         goto tmf_err;
 718                 }
 719                 msleep(20);
 720                 goto retry_tmf;
 721         }
 722         /* Initialize rest of io_req fields */
 723         io_req->sc_cmd = sc_cmd;
 724         io_req->port = port;
 725         io_req->tgt = tgt;
 726
 727         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 728
 729         rc = bnx2fc_init_mp_req(io_req);
 730         if (rc == FAILED) {
 731                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 732                 spin_lock_bh(&tgt->tgt_lock);
 733                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
 734                 spin_unlock_bh(&tgt->tgt_lock);
 735                 goto tmf_err;
 736         }
 737
 738         /* Set TM flags */
 739         io_req->io_req_flags = 0;
 740         tm_req->tm_flags = tm_flags;
 741
 742         /* Fill FCP_CMND */
 743         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 744         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 745         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 746         fcp_cmnd->fc_dl = 0;
 747
 748         /* Fill FC header */
 749         fc_hdr = &(tm_req->req_fc_hdr);
 750         sid = tgt->sid;
 751         did = rport->port_id;
 752         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 753                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 754                            FC_FC_SEQ_INIT, 0);
 755         /* Obtain exchange id */
 756         xid = io_req->xid;
 757
 758         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 759         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 760         index = xid % BNX2FC_TASKS_PER_PAGE;
 761
 762         /* Initialize task context for this IO request */
 763         task_page = (struct fcoe_task_ctx_entry *)
 764                         interface->hba->task_ctx[task_idx];
 765         task = &(task_page[index]);
 766         bnx2fc_init_mp_task(io_req, task);
 767
 768         sc_cmd->SCp.ptr = (char *)io_req;
 769
 770         /* Obtain free SQ entry */
 771         spin_lock_bh(&tgt->tgt_lock);
 772         bnx2fc_add_2_sq(tgt, xid);
 773
 774         /* Enqueue the io_req to active_tm_queue */
 775         io_req->on_tmf_queue = 1;
 776         list_add_tail(&io_req->link, &tgt->active_tm_queue);
 777
 778         init_completion(&io_req->abts_done);
 779         io_req->wait_for_abts_comp = 1;
 780
 781         /* Ring doorbell */
 782         bnx2fc_ring_doorbell(tgt);
 783         spin_unlock_bh(&tgt->tgt_lock);
 784
 785         rc = wait_for_completion_timeout(&io_req->abts_done,
 786                                          interface->tm_timeout * HZ);
 787         spin_lock_bh(&tgt->tgt_lock);
 788
 789         io_req->wait_for_abts_comp = 0;
 790         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 791                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 792                 if (io_req->on_tmf_queue) {
 793                         list_del_init(&io_req->link);
 794                         io_req->on_tmf_queue = 0;
 795                 }
 796                 io_req->wait_for_cleanup_comp = 1;
 797                 init_completion(&io_req->cleanup_done);
 798                 bnx2fc_initiate_cleanup(io_req);
 799                 spin_unlock_bh(&tgt->tgt_lock);
 800                 rc = wait_for_completion_timeout(&io_req->cleanup_done,
 801                                                  BNX2FC_FW_TIMEOUT);
 802                 spin_lock_bh(&tgt->tgt_lock);
 803                 io_req->wait_for_cleanup_comp = 0;
 804                 if (!rc)
 805                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 806         }
 807
 808         spin_unlock_bh(&tgt->tgt_lock);
 809
 810         if (!rc) {
 811                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 812                 rc = FAILED;
 813         } else {
 814                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 815                 rc = SUCCESS;
 816         }
 817 tmf_err:
 818         return rc;
 819 }
 820
 821 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 822 {
 823         struct fc_lport *lport;
 824         struct bnx2fc_rport *tgt = io_req->tgt;
 825         struct fc_rport *rport = tgt->rport;
 826         struct fc_rport_priv *rdata = tgt->rdata;
 827         struct bnx2fc_interface *interface;
 828         struct fcoe_port *port;
 829         struct bnx2fc_cmd *abts_io_req;
 830         struct fcoe_task_ctx_entry *task;
 831         struct fcoe_task_ctx_entry *task_page;
 832         struct fc_frame_header *fc_hdr;
 833         struct bnx2fc_mp_req *abts_req;
 834         int task_idx, index;
 835         u32 sid, did;
 836         u16 xid;
 837         int rc = SUCCESS;
 838         u32 r_a_tov = rdata->r_a_tov;
 839
 840         /* called with tgt_lock held */
 841         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 842
 843         port = io_req->port;
 844         interface = port->priv;
 845         lport = port->lport;
 846
 847         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 848                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 849                 rc = FAILED;
 850                 goto abts_err;
 851         }
 852
 853         if (rport == NULL) {
 854                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 855                 rc = FAILED;
 856                 goto abts_err;
 857         }
 858
 859         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 860                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 861                 rc = FAILED;
 862                 goto abts_err;
 863         }
 864
 865         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 866         if (!abts_io_req) {
 867                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 868                 rc = FAILED;
 869                 goto abts_err;
 870         }
 871
 872         /* Initialize rest of io_req fields */
 873         abts_io_req->sc_cmd = NULL;
 874         abts_io_req->port = port;
 875         abts_io_req->tgt = tgt;
 876         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 877
 878         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 879         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 880
 881         /* Fill FC header */
 882         fc_hdr = &(abts_req->req_fc_hdr);
 883
 884         /* Obtain oxid and rxid for the original exchange to be aborted */
 885         fc_hdr->fh_ox_id = htons(io_req->xid);
 886         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 887
 888         sid = tgt->sid;
 889         did = rport->port_id;
 890
 891         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 892                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 893                            FC_FC_SEQ_INIT, 0);
 894
 895         xid = abts_io_req->xid;
 896         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 897         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 898         index = xid % BNX2FC_TASKS_PER_PAGE;
 899
 900         /* Initialize task context for this IO request */
 901         task_page = (struct fcoe_task_ctx_entry *)
 902                         interface->hba->task_ctx[task_idx];
 903         task = &(task_page[index]);
 904         bnx2fc_init_mp_task(abts_io_req, task);
 905
 906         /*
 907          * ABTS task is a temporary task that will be cleaned up
 908          * irrespective of ABTS response. We need to start the timer
 909          * for the original exchange, as the CQE is posted for the original
 910          * IO request.
 911          *
 912          * Timer for ABTS is started only when it is originated by a
 913          * TM request. For the ABTS issued as part of ULP timeout,
 914          * scsi-ml maintains the timers.
 915          */
 916
 917         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 918         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 919
 920         /* Obtain free SQ entry */
 921         bnx2fc_add_2_sq(tgt, xid);
 922
 923         /* Ring doorbell */
 924         bnx2fc_ring_doorbell(tgt);
 925
 926 abts_err:
 927         return rc;
 928 }
 929
 930 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 931                                 enum fc_rctl r_ctl)
 932 {
 933         struct fc_lport *lport;
 934         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 935         struct bnx2fc_interface *interface;
 936         struct fcoe_port *port;
 937         struct bnx2fc_cmd *seq_clnp_req;
 938         struct fcoe_task_ctx_entry *task;
 939         struct fcoe_task_ctx_entry *task_page;
 940         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 941         int task_idx, index;
 942         u16 xid;
 943         int rc = 0;
 944
 945         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 946                    orig_io_req->xid);
 947         kref_get(&orig_io_req->refcount);
 948
 949         port = orig_io_req->port;
 950         interface = port->priv;
 951         lport = port->lport;
 952
 953         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 954         if (!cb_arg) {
 955                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 956                 rc = -ENOMEM;
 957                 goto cleanup_err;
 958         }
 959
 960         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 961         if (!seq_clnp_req) {
 962                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 963                 rc = -ENOMEM;
 964                 kfree(cb_arg);
 965                 goto cleanup_err;
 966         }
 967         /* Initialize rest of io_req fields */
 968         seq_clnp_req->sc_cmd = NULL;
 969         seq_clnp_req->port = port;
 970         seq_clnp_req->tgt = tgt;
 971         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 972
 973         xid = seq_clnp_req->xid;
 974
 975         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 976         index = xid % BNX2FC_TASKS_PER_PAGE;
 977
 978         /* Initialize task context for this IO request */
 979         task_page = (struct fcoe_task_ctx_entry *)
 980                      interface->hba->task_ctx[task_idx];
 981         task = &(task_page[index]);
 982         cb_arg->aborted_io_req = orig_io_req;
 983         cb_arg->io_req = seq_clnp_req;
 984         cb_arg->r_ctl = r_ctl;
 985         cb_arg->offset = offset;
 986         seq_clnp_req->cb_arg = cb_arg;
 987
 988         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 989         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 990
 991         /* Obtain free SQ entry */
 992         bnx2fc_add_2_sq(tgt, xid);
 993
 994         /* Ring doorbell */
 995         bnx2fc_ring_doorbell(tgt);
 996 cleanup_err:
 997         return rc;
 998 }
 999
1000 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1001 {
1002         struct fc_lport *lport;
1003         struct bnx2fc_rport *tgt = io_req->tgt;
1004         struct bnx2fc_interface *interface;
1005         struct fcoe_port *port;
1006         struct bnx2fc_cmd *cleanup_io_req;
1007         struct fcoe_task_ctx_entry *task;
1008         struct fcoe_task_ctx_entry *task_page;
1009         int task_idx, index;
1010         u16 xid, orig_xid;
1011         int rc = 0;
1012
1013         /* ASSUMPTION: called with tgt_lock held */
1014         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1015
1016         port = io_req->port;
1017         interface = port->priv;
1018         lport = port->lport;
1019
1020         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1021         if (!cleanup_io_req) {
1022                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1023                 rc = -1;
1024                 goto cleanup_err;
1025         }
1026
1027         /* Initialize rest of io_req fields */
1028         cleanup_io_req->sc_cmd = NULL;
1029         cleanup_io_req->port = port;
1030         cleanup_io_req->tgt = tgt;
1031         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1032
1033         xid = cleanup_io_req->xid;
1034
1035         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1036         index = xid % BNX2FC_TASKS_PER_PAGE;
1037
1038         /* Initialize task context for this IO request */
1039         task_page = (struct fcoe_task_ctx_entry *)
1040                         interface->hba->task_ctx[task_idx];
1041         task = &(task_page[index]);
1042         orig_xid = io_req->xid;
1043
1044         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1045
1046         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1047
1048         /* Obtain free SQ entry */
1049         bnx2fc_add_2_sq(tgt, xid);
1050
1051         /* Set flag that cleanup request is pending with the firmware */
1052         set_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1053
1054         /* Ring doorbell */
1055         bnx2fc_ring_doorbell(tgt);
1056
1057 cleanup_err:
1058         return rc;
1059 }
1060
1061 /**
1062  * bnx2fc_eh_target_reset: Reset a target
1063  *
1064  * @sc_cmd:     SCSI command
1065  *
1066  * Set from SCSI host template to send task mgmt command to the target
1067  *      and wait for the response
1068  */
1069 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1070 {
1071         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1072 }
1073
1074 /**
1075  * bnx2fc_eh_device_reset - Reset a single LUN
1076  *
1077  * @sc_cmd:     SCSI command
1078  *
1079  * Set from SCSI host template to send task mgmt command to the target
1080  *      and wait for the response
1081  */
1082 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1083 {
1084         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1085 }
1086
1087 static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1088 {
1089         struct bnx2fc_rport *tgt = io_req->tgt;
1090         unsigned int time_left;
1091
1092         init_completion(&io_req->cleanup_done);
1093         io_req->wait_for_cleanup_comp = 1;
1094         bnx2fc_initiate_cleanup(io_req);
1095
1096         spin_unlock_bh(&tgt->tgt_lock);
1097
1098         /*
1099          * Can't wait forever on cleanup response lest we let the SCSI error
1100          * handler wait forever
1101          */
1102         time_left = wait_for_completion_timeout(&io_req->cleanup_done,
1103                                                 BNX2FC_FW_TIMEOUT);
1104         if (!time_left) {
1105                 BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1106                               __func__);
1107
1108                 /*
1109                  * Put the extra reference to the SCSI command since it would
1110                  * not have been returned in this case.
1111                  */
1112                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1113         }
1114
1115         spin_lock_bh(&tgt->tgt_lock);
1116         io_req->wait_for_cleanup_comp = 0;
1117         return SUCCESS;
1118 }
1119
1120 /**
1121  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1122  *                      SCSI command
1123  *
1124  * @sc_cmd:     SCSI_ML command pointer
1125  *
1126  * SCSI abort request handler
1127  */
1128 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1129 {
1130         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1131         struct fc_rport_libfc_priv *rp = rport->dd_data;
1132         struct bnx2fc_cmd *io_req;
1133         struct fc_lport *lport;
1134         struct bnx2fc_rport *tgt;
1135         int rc;
1136         unsigned int time_left;
1137
1138         rc = fc_block_scsi_eh(sc_cmd);
1139         if (rc)
1140                 return rc;
1141
1142         lport = shost_priv(sc_cmd->device->host);
1143         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1144                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1145                 return FAILED;
1146         }
1147
1148         tgt = (struct bnx2fc_rport *)&rp[1];
1149
1150         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1151
1152         spin_lock_bh(&tgt->tgt_lock);
1153         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1154         if (!io_req) {
1155                 /* Command might have just completed */
1156                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1157                 spin_unlock_bh(&tgt->tgt_lock);
1158                 return SUCCESS;
1159         }
1160         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1161                       kref_read(&io_req->refcount));
1162
1163         /* Hold IO request across abort processing */
1164         kref_get(&io_req->refcount);
1165
1166         BUG_ON(tgt != io_req->tgt);
1167
1168         /* Remove the io_req from the active_q. */
1169         /*
1170          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1171          * issue an ABTS on this particular IO req, as the
1172          * io_req is no longer in the active_q.
1173          */
1174         if (tgt->flush_in_prog) {
1175                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1176                         "flush in progress\n", io_req->xid);
1177                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1178                 spin_unlock_bh(&tgt->tgt_lock);
1179                 return SUCCESS;
1180         }
1181
1182         if (io_req->on_active_queue == 0) {
1183                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1184                                 "not on active_q\n", io_req->xid);
1185                 /*
1186                  * The IO is still with the FW.
1187                  * Return failure and let SCSI-ml retry eh_abort.
1188                  */
1189                 spin_unlock_bh(&tgt->tgt_lock);
1190                 return FAILED;
1191         }
1192
1193         /*
1194          * Only eh_abort processing will remove the IO from
1195          * active_cmd_q before processing the request. this is
1196          * done to avoid race conditions between IOs aborted
1197          * as part of task management completion and eh_abort
1198          * processing
1199          */
1200         list_del_init(&io_req->link);
1201         io_req->on_active_queue = 0;
1202         /* Move IO req to retire queue */
1203         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1204
1205         init_completion(&io_req->abts_done);
1206         init_completion(&io_req->cleanup_done);
1207
1208         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1209                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1210                                 "already in abts processing\n", io_req->xid);
1211                 if (cancel_delayed_work(&io_req->timeout_work))
1212                         kref_put(&io_req->refcount,
1213                                  bnx2fc_cmd_release); /* drop timer hold */
1214                 /*
1215                  * We don't want to hold off the upper layer timer so simply
1216                  * cleanup the command and return that I/O was successfully
1217                  * aborted.
1218                  */
1219                 rc = bnx2fc_abts_cleanup(io_req);
1220                 /* This only occurs when an task abort was requested while ABTS
1221                    is in progress.  Setting the IO_CLEANUP flag will skip the
1222                    RRQ process in the case when the fw generated SCSI_CMD cmpl
1223                    was a result from the ABTS request rather than the CLEANUP
1224                    request */
1225                 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1226                 goto done;
1227         }
1228
1229         /* Cancel the current timer running on this io_req */
1230         if (cancel_delayed_work(&io_req->timeout_work))
1231                 kref_put(&io_req->refcount,
1232                          bnx2fc_cmd_release); /* drop timer hold */
1233         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1234         io_req->wait_for_abts_comp = 1;
1235         rc = bnx2fc_initiate_abts(io_req);
1236         if (rc == FAILED) {
1237                 io_req->wait_for_cleanup_comp = 1;
1238                 bnx2fc_initiate_cleanup(io_req);
1239                 spin_unlock_bh(&tgt->tgt_lock);
1240                 wait_for_completion(&io_req->cleanup_done);
1241                 spin_lock_bh(&tgt->tgt_lock);
1242                 io_req->wait_for_cleanup_comp = 0;
1243                 goto done;
1244         }
1245         spin_unlock_bh(&tgt->tgt_lock);
1246
1247         /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1248         time_left = wait_for_completion_timeout(&io_req->abts_done,
1249                                                 (2 * rp->r_a_tov + 1) * HZ);
1250         if (time_left)
1251                 BNX2FC_IO_DBG(io_req,
1252                               "Timed out in eh_abort waiting for abts_done");
1253
1254         spin_lock_bh(&tgt->tgt_lock);
1255         io_req->wait_for_abts_comp = 0;
1256         if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1257                 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1258                 rc = SUCCESS;
1259         } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1260                                       &io_req->req_flags))) {
1261                 /* Let the scsi-ml try to recover this command */
1262                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1263                        io_req->xid);
1264                 /*
1265                  * Cleanup firmware residuals before returning control back
1266                  * to SCSI ML.
1267                  */
1268                 rc = bnx2fc_abts_cleanup(io_req);
1269                 goto done;
1270         } else {
1271                 /*
1272                  * We come here even when there was a race condition
1273                  * between timeout and abts completion, and abts
1274                  * completion happens just in time.
1275                  */
1276                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1277                 rc = SUCCESS;
1278                 bnx2fc_scsi_done(io_req, DID_ABORT);
1279                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1280         }
1281 done:
1282         /* release the reference taken in eh_abort */
1283         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1284         spin_unlock_bh(&tgt->tgt_lock);
1285         return rc;
1286 }
1287
1288 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1289                                       struct fcoe_task_ctx_entry *task,
1290                                       u8 rx_state)
1291 {
1292         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1293         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1294         u32 offset = cb_arg->offset;
1295         enum fc_rctl r_ctl = cb_arg->r_ctl;
1296         int rc = 0;
1297         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1298
1299         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1300                               "cmd_type = %d\n",
1301                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1302
1303         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1304                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1305                         seq_clnp_req->xid);
1306                 goto free_cb_arg;
1307         }
1308
1309         spin_unlock_bh(&tgt->tgt_lock);
1310         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1311         spin_lock_bh(&tgt->tgt_lock);
1312
1313         if (rc)
1314                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1315                         " IO will abort\n");
1316         seq_clnp_req->cb_arg = NULL;
1317         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1318 free_cb_arg:
1319         kfree(cb_arg);
1320         return;
1321 }
1322
1323 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1324                                   struct fcoe_task_ctx_entry *task,
1325                                   u8 num_rq)
1326 {
1327         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1328                               "refcnt = %d, cmd_type = %d\n",
1329                    kref_read(&io_req->refcount), io_req->cmd_type);
1330         /*
1331          * Test whether there is a cleanup request pending. If not just
1332          * exit.
1333          */
1334         if (!test_and_clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ,
1335                                 &io_req->req_flags))
1336                 return;
1337         /*
1338          * If we receive a cleanup completion for this request then the
1339          * firmware will not give us an abort completion for this request
1340          * so clear any ABTS pending flags.
1341          */
1342         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags) &&
1343             !test_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags)) {
1344                 set_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags);
1345                 if (io_req->wait_for_abts_comp)
1346                         complete(&io_req->abts_done);
1347         }
1348
1349         bnx2fc_scsi_done(io_req, DID_ERROR);
1350         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1351         if (io_req->wait_for_cleanup_comp)
1352                 complete(&io_req->cleanup_done);
1353 }
1354
1355 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1356                                struct fcoe_task_ctx_entry *task,
1357                                u8 num_rq)
1358 {
1359         u32 r_ctl;
1360         u32 r_a_tov = FC_DEF_R_A_TOV;
1361         u8 issue_rrq = 0;
1362         struct bnx2fc_rport *tgt = io_req->tgt;
1363
1364         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1365                               "refcnt = %d, cmd_type = %d\n",
1366                    io_req->xid,
1367                    kref_read(&io_req->refcount), io_req->cmd_type);
1368
1369         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1370                                        &io_req->req_flags)) {
1371                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1372                                 " this io\n");
1373                 return;
1374         }
1375
1376         /*
1377          * If we receive an ABTS completion here then we will not receive
1378          * a cleanup completion so clear any cleanup pending flags.
1379          */
1380         if (test_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags)) {
1381                 clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1382                 if (io_req->wait_for_cleanup_comp)
1383                         complete(&io_req->cleanup_done);
1384         }
1385
1386         /* Do not issue RRQ as this IO is already cleanedup */
1387         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1388                                 &io_req->req_flags))
1389                 goto io_compl;
1390
1391         /*
1392          * For ABTS issued due to SCSI eh_abort_handler, timeout
1393          * values are maintained by scsi-ml itself. Cancel timeout
1394          * in case ABTS issued as part of task management function
1395          * or due to FW error.
1396          */
1397         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1398                 if (cancel_delayed_work(&io_req->timeout_work))
1399                         kref_put(&io_req->refcount,
1400                                  bnx2fc_cmd_release); /* drop timer hold */
1401
1402         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1403
1404         switch (r_ctl) {
1405         case FC_RCTL_BA_ACC:
1406                 /*
1407                  * Dont release this cmd yet. It will be relesed
1408                  * after we get RRQ response
1409                  */
1410                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1411                 issue_rrq = 1;
1412                 break;
1413
1414         case FC_RCTL_BA_RJT:
1415                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1416                 break;
1417         default:
1418                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1419                 break;
1420         }
1421
1422         if (issue_rrq) {
1423                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1424                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1425         }
1426         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1427         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1428
1429 io_compl:
1430         if (io_req->wait_for_abts_comp) {
1431                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1432                                        &io_req->req_flags))
1433                         complete(&io_req->abts_done);
1434         } else {
1435                 /*
1436                  * We end up here when ABTS is issued as
1437                  * in asynchronous context, i.e., as part
1438                  * of task management completion, or
1439                  * when FW error is received or when the
1440                  * ABTS is issued when the IO is timed
1441                  * out.
1442                  */
1443
1444                 if (io_req->on_active_queue) {
1445                         list_del_init(&io_req->link);
1446                         io_req->on_active_queue = 0;
1447                         /* Move IO req to retire queue */
1448                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1449                 }
1450                 bnx2fc_scsi_done(io_req, DID_ERROR);
1451                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1452         }
1453 }
1454
1455 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1456 {
1457         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1458         struct bnx2fc_rport *tgt = io_req->tgt;
1459         struct bnx2fc_cmd *cmd, *tmp;
1460         u64 tm_lun = sc_cmd->device->lun;
1461         u64 lun;
1462         int rc = 0;
1463
1464         /* called with tgt_lock held */
1465         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1466         /*
1467          * Walk thru the active_ios queue and ABORT the IO
1468          * that matches with the LUN that was reset
1469          */
1470         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1471                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1472                 lun = cmd->sc_cmd->device->lun;
1473                 if (lun == tm_lun) {
1474                         /* Initiate ABTS on this cmd */
1475                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1476                                               &cmd->req_flags)) {
1477                                 /* cancel the IO timeout */
1478                                 if (cancel_delayed_work(&io_req->timeout_work))
1479                                         kref_put(&io_req->refcount,
1480                                                  bnx2fc_cmd_release);
1481                                                         /* timer hold */
1482                                 rc = bnx2fc_initiate_abts(cmd);
1483                                 /* abts shouldn't fail in this context */
1484                                 WARN_ON(rc != SUCCESS);
1485                         } else
1486                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1487                                         " progress for this IO 0x%x\n",
1488                                         cmd->xid);
1489                 }
1490         }
1491 }
1492
1493 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1494 {
1495         struct bnx2fc_rport *tgt = io_req->tgt;
1496         struct bnx2fc_cmd *cmd, *tmp;
1497         int rc = 0;
1498
1499         /* called with tgt_lock held */
1500         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1501         /*
1502          * Walk thru the active_ios queue and ABORT the IO
1503          * that matches with the LUN that was reset
1504          */
1505         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1506                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1507                 /* Initiate ABTS */
1508                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1509                                                         &cmd->req_flags)) {
1510                         /* cancel the IO timeout */
1511                         if (cancel_delayed_work(&io_req->timeout_work))
1512                                 kref_put(&io_req->refcount,
1513                                          bnx2fc_cmd_release); /* timer hold */
1514                         rc = bnx2fc_initiate_abts(cmd);
1515                         /* abts shouldn't fail in this context */
1516                         WARN_ON(rc != SUCCESS);
1517
1518                 } else
1519                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1520                                 " for this IO 0x%x\n", cmd->xid);
1521         }
1522 }
1523
1524 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1525                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1526 {
1527         struct bnx2fc_mp_req *tm_req;
1528         struct fc_frame_header *fc_hdr;
1529         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1530         u64 *hdr;
1531         u64 *temp_hdr;
1532         void *rsp_buf;
1533
1534         /* Called with tgt_lock held */
1535         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1536
1537         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1538                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1539         else {
1540                 /* TM has already timed out and we got
1541                  * delayed completion. Ignore completion
1542                  * processing.
1543                  */
1544                 return;
1545         }
1546
1547         tm_req = &(io_req->mp_req);
1548         fc_hdr = &(tm_req->resp_fc_hdr);
1549         hdr = (u64 *)fc_hdr;
1550         temp_hdr = (u64 *)
1551                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1552         hdr[0] = cpu_to_be64(temp_hdr[0]);
1553         hdr[1] = cpu_to_be64(temp_hdr[1]);
1554         hdr[2] = cpu_to_be64(temp_hdr[2]);
1555
1556         tm_req->resp_len =
1557                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1558
1559         rsp_buf = tm_req->resp_buf;
1560
1561         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1562                 bnx2fc_parse_fcp_rsp(io_req,
1563                                      (struct fcoe_fcp_rsp_payload *)
1564                                      rsp_buf, num_rq);
1565                 if (io_req->fcp_rsp_code == 0) {
1566                         /* TM successful */
1567                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1568                                 bnx2fc_lun_reset_cmpl(io_req);
1569                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1570                                 bnx2fc_tgt_reset_cmpl(io_req);
1571                 }
1572         } else {
1573                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1574                         fc_hdr->fh_r_ctl);
1575         }
1576         if (!sc_cmd->SCp.ptr) {
1577                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1578                 return;
1579         }
1580         switch (io_req->fcp_status) {
1581         case FC_GOOD:
1582                 if (io_req->cdb_status == 0) {
1583                         /* Good IO completion */
1584                         sc_cmd->result = DID_OK << 16;
1585                 } else {
1586                         /* Transport status is good, SCSI status not good */
1587                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1588                 }
1589                 if (io_req->fcp_resid)
1590                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1591                 break;
1592
1593         default:
1594                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1595                            io_req->fcp_status);
1596                 break;
1597         }
1598
1599         sc_cmd = io_req->sc_cmd;
1600         io_req->sc_cmd = NULL;
1601
1602         /* check if the io_req exists in tgt's tmf_q */
1603         if (io_req->on_tmf_queue) {
1604
1605                 list_del_init(&io_req->link);
1606                 io_req->on_tmf_queue = 0;
1607         } else {
1608
1609                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1610                 return;
1611         }
1612
1613         sc_cmd->SCp.ptr = NULL;
1614         sc_cmd->scsi_done(sc_cmd);
1615
1616         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1617         if (io_req->wait_for_abts_comp) {
1618                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1619                 complete(&io_req->abts_done);
1620         }
1621 }
1622
1623 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1624                            int bd_index)
1625 {
1626         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1627         int frag_size, sg_frags;
1628
1629         sg_frags = 0;
1630         while (sg_len) {
1631                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1632                         frag_size = BNX2FC_BD_SPLIT_SZ;
1633                 else
1634                         frag_size = sg_len;
1635                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1636                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1637                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1638                 bd[bd_index + sg_frags].flags = 0;
1639
1640                 addr += (u64) frag_size;
1641                 sg_frags++;
1642                 sg_len -= frag_size;
1643         }
1644         return sg_frags;
1645
1646 }
1647
1648 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1649 {
1650         struct bnx2fc_interface *interface = io_req->port->priv;
1651         struct bnx2fc_hba *hba = interface->hba;
1652         struct scsi_cmnd *sc = io_req->sc_cmd;
1653         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1654         struct scatterlist *sg;
1655         int byte_count = 0;
1656         int sg_count = 0;
1657         int bd_count = 0;
1658         int sg_frags;
1659         unsigned int sg_len;
1660         u64 addr;
1661         int i;
1662
1663         WARN_ON(scsi_sg_count(sc) > BNX2FC_MAX_BDS_PER_CMD);
1664         /*
1665          * Use dma_map_sg directly to ensure we're using the correct
1666          * dev struct off of pcidev.
1667          */
1668         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1669                               scsi_sg_count(sc), sc->sc_data_direction);
1670         scsi_for_each_sg(sc, sg, sg_count, i) {
1671                 sg_len = sg_dma_len(sg);
1672                 addr = sg_dma_address(sg);
1673                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1674                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1675                                                    bd_count);
1676                 } else {
1677
1678                         sg_frags = 1;
1679                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1680                         bd[bd_count].buf_addr_hi  = addr >> 32;
1681                         bd[bd_count].buf_len = (u16)sg_len;
1682                         bd[bd_count].flags = 0;
1683                 }
1684                 bd_count += sg_frags;
1685                 byte_count += sg_len;
1686         }
1687         if (byte_count != scsi_bufflen(sc))
1688                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1689                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1690                         io_req->xid);
1691         return bd_count;
1692 }
1693
1694 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1695 {
1696         struct scsi_cmnd *sc = io_req->sc_cmd;
1697         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1698         int bd_count;
1699
1700         if (scsi_sg_count(sc)) {
1701                 bd_count = bnx2fc_map_sg(io_req);
1702                 if (bd_count == 0)
1703                         return -ENOMEM;
1704         } else {
1705                 bd_count = 0;
1706                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1707                 bd[0].buf_len = bd[0].flags = 0;
1708         }
1709         io_req->bd_tbl->bd_valid = bd_count;
1710
1711         /*
1712          * Return the command to ML if BD count exceeds the max number
1713          * that can be handled by FW.
1714          */
1715         if (bd_count > BNX2FC_FW_MAX_BDS_PER_CMD) {
1716                 pr_err("bd_count = %d exceeded FW supported max BD(255), task_id = 0x%x\n",
1717                        bd_count, io_req->xid);
1718                 return -ENOMEM;
1719         }
1720
1721         return 0;
1722 }
1723
1724 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1725 {
1726         struct scsi_cmnd *sc = io_req->sc_cmd;
1727         struct bnx2fc_interface *interface = io_req->port->priv;
1728         struct bnx2fc_hba *hba = interface->hba;
1729
1730         /*
1731          * Use dma_unmap_sg directly to ensure we're using the correct
1732          * dev struct off of pcidev.
1733          */
1734         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1735                 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1736                     scsi_sg_count(sc), sc->sc_data_direction);
1737                 io_req->bd_tbl->bd_valid = 0;
1738         }
1739 }
1740
1741 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1742                                   struct fcp_cmnd *fcp_cmnd)
1743 {
1744         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1745
1746         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1747
1748         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1749
1750         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1751         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1752
1753         fcp_cmnd->fc_cmdref = 0;
1754         fcp_cmnd->fc_pri_ta = 0;
1755         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1756         fcp_cmnd->fc_flags = io_req->io_req_flags;
1757         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1758 }
1759
1760 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1761                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1762                                  u8 num_rq)
1763 {
1764         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1765         struct bnx2fc_rport *tgt = io_req->tgt;
1766         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1767         u32 rq_buff_len = 0;
1768         int i;
1769         unsigned char *rq_data;
1770         unsigned char *dummy;
1771         int fcp_sns_len = 0;
1772         int fcp_rsp_len = 0;
1773
1774         io_req->fcp_status = FC_GOOD;
1775         io_req->fcp_resid = 0;
1776         if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1777             FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1778                 io_req->fcp_resid = fcp_rsp->fcp_resid;
1779
1780         io_req->scsi_comp_flags = rsp_flags;
1781         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1782                                 fcp_rsp->scsi_status_code;
1783
1784         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1785         if (num_rq) {
1786
1787                 /*
1788                  * We do not anticipate num_rq >1, as the linux defined
1789                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1790                  * 256 bytes of single rq buffer is good enough to hold this.
1791                  */
1792
1793                 if (rsp_flags &
1794                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1795                         fcp_rsp_len = rq_buff_len
1796                                         = fcp_rsp->fcp_rsp_len;
1797                 }
1798
1799                 if (rsp_flags &
1800                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1801                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1802                         rq_buff_len += fcp_rsp->fcp_sns_len;
1803                 }
1804
1805                 io_req->fcp_rsp_len = fcp_rsp_len;
1806                 io_req->fcp_sns_len = fcp_sns_len;
1807
1808                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1809                         /* Invalid sense sense length. */
1810                         printk(KERN_ERR PFX "invalid sns length %d\n",
1811                                 rq_buff_len);
1812                         /* reset rq_buff_len */
1813                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1814                 }
1815
1816                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1817
1818                 if (num_rq > 1) {
1819                         /* We do not need extra sense data */
1820                         for (i = 1; i < num_rq; i++)
1821                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1822                 }
1823
1824                 /* fetch fcp_rsp_code */
1825                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1826                         /* Only for task management function */
1827                         io_req->fcp_rsp_code = rq_data[3];
1828                         BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1829                                 io_req->fcp_rsp_code);
1830                 }
1831
1832                 /* fetch sense data */
1833                 rq_data += fcp_rsp_len;
1834
1835                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1836                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1837                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1838                 }
1839
1840                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1841                 if (fcp_sns_len)
1842                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1843
1844                 /* return RQ entries */
1845                 for (i = 0; i < num_rq; i++)
1846                         bnx2fc_return_rqe(tgt, 1);
1847         }
1848 }
1849
1850 /**
1851  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1852  *
1853  * @host:       The Scsi_Host the command was issued to
1854  * @sc_cmd:     struct scsi_cmnd to be executed
1855  *
1856  * This is the IO strategy routine, called by SCSI-ML
1857  **/
1858 int bnx2fc_queuecommand(struct Scsi_Host *host,
1859                         struct scsi_cmnd *sc_cmd)
1860 {
1861         struct fc_lport *lport = shost_priv(host);
1862         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1863         struct fc_rport_libfc_priv *rp = rport->dd_data;
1864         struct bnx2fc_rport *tgt;
1865         struct bnx2fc_cmd *io_req;
1866         int rc = 0;
1867         int rval;
1868
1869         rval = fc_remote_port_chkready(rport);
1870         if (rval) {
1871                 sc_cmd->result = rval;
1872                 sc_cmd->scsi_done(sc_cmd);
1873                 return 0;
1874         }
1875
1876         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1877                 rc = SCSI_MLQUEUE_HOST_BUSY;
1878                 goto exit_qcmd;
1879         }
1880
1881         /* rport and tgt are allocated together, so tgt should be non-NULL */
1882         tgt = (struct bnx2fc_rport *)&rp[1];
1883
1884         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1885                 /*
1886                  * Session is not offloaded yet. Let SCSI-ml retry
1887                  * the command.
1888                  */
1889                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1890                 goto exit_qcmd;
1891         }
1892         if (tgt->retry_delay_timestamp) {
1893                 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1894                         tgt->retry_delay_timestamp = 0;
1895                 } else {
1896                         /* If retry_delay timer is active, flow off the ML */
1897                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1898                         goto exit_qcmd;
1899                 }
1900         }
1901
1902         spin_lock_bh(&tgt->tgt_lock);
1903
1904         io_req = bnx2fc_cmd_alloc(tgt);
1905         if (!io_req) {
1906                 rc = SCSI_MLQUEUE_HOST_BUSY;
1907                 goto exit_qcmd_tgtlock;
1908         }
1909         io_req->sc_cmd = sc_cmd;
1910
1911         if (bnx2fc_post_io_req(tgt, io_req)) {
1912                 printk(KERN_ERR PFX "Unable to post io_req\n");
1913                 rc = SCSI_MLQUEUE_HOST_BUSY;
1914                 goto exit_qcmd_tgtlock;
1915         }
1916
1917 exit_qcmd_tgtlock:
1918         spin_unlock_bh(&tgt->tgt_lock);
1919 exit_qcmd:
1920         return rc;
1921 }
1922
1923 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1924                                    struct fcoe_task_ctx_entry *task,
1925                                    u8 num_rq)
1926 {
1927         struct fcoe_fcp_rsp_payload *fcp_rsp;
1928         struct bnx2fc_rport *tgt = io_req->tgt;
1929         struct scsi_cmnd *sc_cmd;
1930         struct Scsi_Host *host;
1931
1932
1933         /* scsi_cmd_cmpl is called with tgt lock held */
1934
1935         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1936                 /* we will not receive ABTS response for this IO */
1937                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1938                            "this scsi cmd\n");
1939                 return;
1940         }
1941
1942         /* Cancel the timeout_work, as we received IO completion */
1943         if (cancel_delayed_work(&io_req->timeout_work))
1944                 kref_put(&io_req->refcount,
1945                          bnx2fc_cmd_release); /* drop timer hold */
1946
1947         sc_cmd = io_req->sc_cmd;
1948         if (sc_cmd == NULL) {
1949                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1950                 return;
1951         }
1952
1953         /* Fetch fcp_rsp from task context and perform cmd completion */
1954         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1955                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1956
1957         /* parse fcp_rsp and obtain sense data from RQ if available */
1958         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1959
1960         host = sc_cmd->device->host;
1961         if (!sc_cmd->SCp.ptr) {
1962                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1963                 return;
1964         }
1965
1966         if (io_req->on_active_queue) {
1967                 list_del_init(&io_req->link);
1968                 io_req->on_active_queue = 0;
1969                 /* Move IO req to retire queue */
1970                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1971         } else {
1972                 /* This should not happen, but could have been pulled
1973                  * by bnx2fc_flush_active_ios(), or during a race
1974                  * between command abort and (late) completion.
1975                  */
1976                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1977                 if (io_req->wait_for_abts_comp)
1978                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1979                                                &io_req->req_flags))
1980                                 complete(&io_req->abts_done);
1981         }
1982
1983         bnx2fc_unmap_sg_list(io_req);
1984         io_req->sc_cmd = NULL;
1985
1986         switch (io_req->fcp_status) {
1987         case FC_GOOD:
1988                 if (io_req->cdb_status == 0) {
1989                         /* Good IO completion */
1990                         sc_cmd->result = DID_OK << 16;
1991                 } else {
1992                         /* Transport status is good, SCSI status not good */
1993                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1994                                  " fcp_resid = 0x%x\n",
1995                                 io_req->cdb_status, io_req->fcp_resid);
1996                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1997
1998                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1999                             io_req->cdb_status == SAM_STAT_BUSY) {
2000                                 /* Set the jiffies + retry_delay_timer * 100ms
2001                                    for the rport/tgt */
2002                                 tgt->retry_delay_timestamp = jiffies +
2003                                         fcp_rsp->retry_delay_timer * HZ / 10;
2004                         }
2005
2006                 }
2007                 if (io_req->fcp_resid)
2008                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
2009                 break;
2010         default:
2011                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
2012                         io_req->fcp_status);
2013                 break;
2014         }
2015         sc_cmd->SCp.ptr = NULL;
2016         sc_cmd->scsi_done(sc_cmd);
2017         kref_put(&io_req->refcount, bnx2fc_cmd_release);
2018 }
2019
2020 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
2021                                struct bnx2fc_cmd *io_req)
2022 {
2023         struct fcoe_task_ctx_entry *task;
2024         struct fcoe_task_ctx_entry *task_page;
2025         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2026         struct fcoe_port *port = tgt->port;
2027         struct bnx2fc_interface *interface = port->priv;
2028         struct bnx2fc_hba *hba = interface->hba;
2029         struct fc_lport *lport = port->lport;
2030         struct fc_stats *stats;
2031         int task_idx, index;
2032         u16 xid;
2033
2034         /* bnx2fc_post_io_req() is called with the tgt_lock held */
2035
2036         /* Initialize rest of io_req fields */
2037         io_req->cmd_type = BNX2FC_SCSI_CMD;
2038         io_req->port = port;
2039         io_req->tgt = tgt;
2040         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2041         sc_cmd->SCp.ptr = (char *)io_req;
2042
2043         stats = per_cpu_ptr(lport->stats, get_cpu());
2044         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2045                 io_req->io_req_flags = BNX2FC_READ;
2046                 stats->InputRequests++;
2047                 stats->InputBytes += io_req->data_xfer_len;
2048         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2049                 io_req->io_req_flags = BNX2FC_WRITE;
2050                 stats->OutputRequests++;
2051                 stats->OutputBytes += io_req->data_xfer_len;
2052         } else {
2053                 io_req->io_req_flags = 0;
2054                 stats->ControlRequests++;
2055         }
2056         put_cpu();
2057
2058         xid = io_req->xid;
2059
2060         /* Build buffer descriptor list for firmware from sg list */
2061         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2062                 printk(KERN_ERR PFX "BD list creation failed\n");
2063                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2064                 return -EAGAIN;
2065         }
2066
2067         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2068         index = xid % BNX2FC_TASKS_PER_PAGE;
2069
2070         /* Initialize task context for this IO request */
2071         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2072         task = &(task_page[index]);
2073         bnx2fc_init_task(io_req, task);
2074
2075         if (tgt->flush_in_prog) {
2076                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2077                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2078                 return -EAGAIN;
2079         }
2080
2081         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2082                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2083                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2084                 return -EAGAIN;
2085         }
2086
2087         /* Time IO req */
2088         if (tgt->io_timeout)
2089                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2090         /* Obtain free SQ entry */
2091         bnx2fc_add_2_sq(tgt, xid);
2092
2093         /* Enqueue the io_req to active_cmd_queue */
2094
2095         io_req->on_active_queue = 1;
2096         /* move io_req from pending_queue to active_queue */
2097         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2098
2099         /* Ring doorbell */
2100         bnx2fc_ring_doorbell(tgt);
2101         return 0;
2102 }