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->tm_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->tm_done);
 779         io_req->wait_for_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->tm_done,
 786                                          interface->tm_timeout * HZ);
 787         spin_lock_bh(&tgt->tgt_lock);
 788
 789         io_req->wait_for_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_comp = 1;
 797                 bnx2fc_initiate_cleanup(io_req);
 798                 spin_unlock_bh(&tgt->tgt_lock);
 799                 rc = wait_for_completion_timeout(&io_req->tm_done,
 800                                                  BNX2FC_FW_TIMEOUT);
 801                 spin_lock_bh(&tgt->tgt_lock);
 802                 io_req->wait_for_comp = 0;
 803                 if (!rc)
 804                         kref_put(&io_req->refcount, bnx2fc_cmd_release);
 805         }
 806
 807         spin_unlock_bh(&tgt->tgt_lock);
 808
 809         if (!rc) {
 810                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 811                 rc = FAILED;
 812         } else {
 813                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 814                 rc = SUCCESS;
 815         }
 816 tmf_err:
 817         return rc;
 818 }
 819
 820 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 821 {
 822         struct fc_lport *lport;
 823         struct bnx2fc_rport *tgt = io_req->tgt;
 824         struct fc_rport *rport = tgt->rport;
 825         struct fc_rport_priv *rdata = tgt->rdata;
 826         struct bnx2fc_interface *interface;
 827         struct fcoe_port *port;
 828         struct bnx2fc_cmd *abts_io_req;
 829         struct fcoe_task_ctx_entry *task;
 830         struct fcoe_task_ctx_entry *task_page;
 831         struct fc_frame_header *fc_hdr;
 832         struct bnx2fc_mp_req *abts_req;
 833         int task_idx, index;
 834         u32 sid, did;
 835         u16 xid;
 836         int rc = SUCCESS;
 837         u32 r_a_tov = rdata->r_a_tov;
 838
 839         /* called with tgt_lock held */
 840         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 841
 842         port = io_req->port;
 843         interface = port->priv;
 844         lport = port->lport;
 845
 846         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 847                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 848                 rc = FAILED;
 849                 goto abts_err;
 850         }
 851
 852         if (rport == NULL) {
 853                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 854                 rc = FAILED;
 855                 goto abts_err;
 856         }
 857
 858         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 859                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 860                 rc = FAILED;
 861                 goto abts_err;
 862         }
 863
 864         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 865         if (!abts_io_req) {
 866                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 867                 rc = FAILED;
 868                 goto abts_err;
 869         }
 870
 871         /* Initialize rest of io_req fields */
 872         abts_io_req->sc_cmd = NULL;
 873         abts_io_req->port = port;
 874         abts_io_req->tgt = tgt;
 875         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 876
 877         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 878         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 879
 880         /* Fill FC header */
 881         fc_hdr = &(abts_req->req_fc_hdr);
 882
 883         /* Obtain oxid and rxid for the original exchange to be aborted */
 884         fc_hdr->fh_ox_id = htons(io_req->xid);
 885         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 886
 887         sid = tgt->sid;
 888         did = rport->port_id;
 889
 890         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 891                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 892                            FC_FC_SEQ_INIT, 0);
 893
 894         xid = abts_io_req->xid;
 895         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 896         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 897         index = xid % BNX2FC_TASKS_PER_PAGE;
 898
 899         /* Initialize task context for this IO request */
 900         task_page = (struct fcoe_task_ctx_entry *)
 901                         interface->hba->task_ctx[task_idx];
 902         task = &(task_page[index]);
 903         bnx2fc_init_mp_task(abts_io_req, task);
 904
 905         /*
 906          * ABTS task is a temporary task that will be cleaned up
 907          * irrespective of ABTS response. We need to start the timer
 908          * for the original exchange, as the CQE is posted for the original
 909          * IO request.
 910          *
 911          * Timer for ABTS is started only when it is originated by a
 912          * TM request. For the ABTS issued as part of ULP timeout,
 913          * scsi-ml maintains the timers.
 914          */
 915
 916         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 917         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 918
 919         /* Obtain free SQ entry */
 920         bnx2fc_add_2_sq(tgt, xid);
 921
 922         /* Ring doorbell */
 923         bnx2fc_ring_doorbell(tgt);
 924
 925 abts_err:
 926         return rc;
 927 }
 928
 929 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 930                                 enum fc_rctl r_ctl)
 931 {
 932         struct fc_lport *lport;
 933         struct bnx2fc_rport *tgt = orig_io_req->tgt;
 934         struct bnx2fc_interface *interface;
 935         struct fcoe_port *port;
 936         struct bnx2fc_cmd *seq_clnp_req;
 937         struct fcoe_task_ctx_entry *task;
 938         struct fcoe_task_ctx_entry *task_page;
 939         struct bnx2fc_els_cb_arg *cb_arg = NULL;
 940         int task_idx, index;
 941         u16 xid;
 942         int rc = 0;
 943
 944         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 945                    orig_io_req->xid);
 946         kref_get(&orig_io_req->refcount);
 947
 948         port = orig_io_req->port;
 949         interface = port->priv;
 950         lport = port->lport;
 951
 952         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 953         if (!cb_arg) {
 954                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 955                 rc = -ENOMEM;
 956                 goto cleanup_err;
 957         }
 958
 959         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 960         if (!seq_clnp_req) {
 961                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 962                 rc = -ENOMEM;
 963                 kfree(cb_arg);
 964                 goto cleanup_err;
 965         }
 966         /* Initialize rest of io_req fields */
 967         seq_clnp_req->sc_cmd = NULL;
 968         seq_clnp_req->port = port;
 969         seq_clnp_req->tgt = tgt;
 970         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 971
 972         xid = seq_clnp_req->xid;
 973
 974         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 975         index = xid % BNX2FC_TASKS_PER_PAGE;
 976
 977         /* Initialize task context for this IO request */
 978         task_page = (struct fcoe_task_ctx_entry *)
 979                      interface->hba->task_ctx[task_idx];
 980         task = &(task_page[index]);
 981         cb_arg->aborted_io_req = orig_io_req;
 982         cb_arg->io_req = seq_clnp_req;
 983         cb_arg->r_ctl = r_ctl;
 984         cb_arg->offset = offset;
 985         seq_clnp_req->cb_arg = cb_arg;
 986
 987         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 988         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 989
 990         /* Obtain free SQ entry */
 991         bnx2fc_add_2_sq(tgt, xid);
 992
 993         /* Ring doorbell */
 994         bnx2fc_ring_doorbell(tgt);
 995 cleanup_err:
 996         return rc;
 997 }
 998
 999 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1000 {
1001         struct fc_lport *lport;
1002         struct bnx2fc_rport *tgt = io_req->tgt;
1003         struct bnx2fc_interface *interface;
1004         struct fcoe_port *port;
1005         struct bnx2fc_cmd *cleanup_io_req;
1006         struct fcoe_task_ctx_entry *task;
1007         struct fcoe_task_ctx_entry *task_page;
1008         int task_idx, index;
1009         u16 xid, orig_xid;
1010         int rc = 0;
1011
1012         /* ASSUMPTION: called with tgt_lock held */
1013         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1014
1015         port = io_req->port;
1016         interface = port->priv;
1017         lport = port->lport;
1018
1019         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1020         if (!cleanup_io_req) {
1021                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1022                 rc = -1;
1023                 goto cleanup_err;
1024         }
1025
1026         /* Initialize rest of io_req fields */
1027         cleanup_io_req->sc_cmd = NULL;
1028         cleanup_io_req->port = port;
1029         cleanup_io_req->tgt = tgt;
1030         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1031
1032         xid = cleanup_io_req->xid;
1033
1034         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1035         index = xid % BNX2FC_TASKS_PER_PAGE;
1036
1037         /* Initialize task context for this IO request */
1038         task_page = (struct fcoe_task_ctx_entry *)
1039                         interface->hba->task_ctx[task_idx];
1040         task = &(task_page[index]);
1041         orig_xid = io_req->xid;
1042
1043         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1044
1045         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1046
1047         /* Obtain free SQ entry */
1048         bnx2fc_add_2_sq(tgt, xid);
1049
1050         /* Ring doorbell */
1051         bnx2fc_ring_doorbell(tgt);
1052
1053 cleanup_err:
1054         return rc;
1055 }
1056
1057 /**
1058  * bnx2fc_eh_target_reset: Reset a target
1059  *
1060  * @sc_cmd:     SCSI command
1061  *
1062  * Set from SCSI host template to send task mgmt command to the target
1063  *      and wait for the response
1064  */
1065 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1066 {
1067         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1068 }
1069
1070 /**
1071  * bnx2fc_eh_device_reset - Reset a single LUN
1072  *
1073  * @sc_cmd:     SCSI command
1074  *
1075  * Set from SCSI host template to send task mgmt command to the target
1076  *      and wait for the response
1077  */
1078 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1079 {
1080         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1081 }
1082
1083 static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1084 {
1085         struct bnx2fc_rport *tgt = io_req->tgt;
1086         int rc = SUCCESS;
1087         unsigned int time_left;
1088
1089         io_req->wait_for_comp = 1;
1090         bnx2fc_initiate_cleanup(io_req);
1091
1092         spin_unlock_bh(&tgt->tgt_lock);
1093
1094         /*
1095          * Can't wait forever on cleanup response lest we let the SCSI error
1096          * handler wait forever
1097          */
1098         time_left = wait_for_completion_timeout(&io_req->tm_done,
1099                                                 BNX2FC_FW_TIMEOUT);
1100         io_req->wait_for_comp = 0;
1101         if (!time_left)
1102                 BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1103                               __func__);
1104
1105         /*
1106          * Release reference held by SCSI command the cleanup completion
1107          * hits the BNX2FC_CLEANUP case in bnx2fc_process_cq_compl() and
1108          * thus the SCSI command is not returnedi by bnx2fc_scsi_done().
1109          */
1110         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1111
1112         spin_lock_bh(&tgt->tgt_lock);
1113         return rc;
1114 }
1115
1116 /**
1117  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1118  *                      SCSI command
1119  *
1120  * @sc_cmd:     SCSI_ML command pointer
1121  *
1122  * SCSI abort request handler
1123  */
1124 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1125 {
1126         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1127         struct fc_rport_libfc_priv *rp = rport->dd_data;
1128         struct bnx2fc_cmd *io_req;
1129         struct fc_lport *lport;
1130         struct bnx2fc_rport *tgt;
1131         int rc;
1132         unsigned int time_left;
1133
1134         rc = fc_block_scsi_eh(sc_cmd);
1135         if (rc)
1136                 return rc;
1137
1138         lport = shost_priv(sc_cmd->device->host);
1139         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1140                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1141                 return FAILED;
1142         }
1143
1144         tgt = (struct bnx2fc_rport *)&rp[1];
1145
1146         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1147
1148         spin_lock_bh(&tgt->tgt_lock);
1149         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1150         if (!io_req) {
1151                 /* Command might have just completed */
1152                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1153                 spin_unlock_bh(&tgt->tgt_lock);
1154                 return SUCCESS;
1155         }
1156         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1157                       kref_read(&io_req->refcount));
1158
1159         /* Hold IO request across abort processing */
1160         kref_get(&io_req->refcount);
1161
1162         BUG_ON(tgt != io_req->tgt);
1163
1164         /* Remove the io_req from the active_q. */
1165         /*
1166          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1167          * issue an ABTS on this particular IO req, as the
1168          * io_req is no longer in the active_q.
1169          */
1170         if (tgt->flush_in_prog) {
1171                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1172                         "flush in progress\n", io_req->xid);
1173                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1174                 spin_unlock_bh(&tgt->tgt_lock);
1175                 return SUCCESS;
1176         }
1177
1178         if (io_req->on_active_queue == 0) {
1179                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1180                                 "not on active_q\n", io_req->xid);
1181                 /*
1182                  * The IO is still with the FW.
1183                  * Return failure and let SCSI-ml retry eh_abort.
1184                  */
1185                 spin_unlock_bh(&tgt->tgt_lock);
1186                 return FAILED;
1187         }
1188
1189         /*
1190          * Only eh_abort processing will remove the IO from
1191          * active_cmd_q before processing the request. this is
1192          * done to avoid race conditions between IOs aborted
1193          * as part of task management completion and eh_abort
1194          * processing
1195          */
1196         list_del_init(&io_req->link);
1197         io_req->on_active_queue = 0;
1198         /* Move IO req to retire queue */
1199         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1200
1201         init_completion(&io_req->tm_done);
1202
1203         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1204                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1205                                 "already in abts processing\n", io_req->xid);
1206                 if (cancel_delayed_work(&io_req->timeout_work))
1207                         kref_put(&io_req->refcount,
1208                                  bnx2fc_cmd_release); /* drop timer hold */
1209                 /*
1210                  * We don't want to hold off the upper layer timer so simply
1211                  * cleanup the command and return that I/O was successfully
1212                  * aborted.
1213                  */
1214                 rc = bnx2fc_abts_cleanup(io_req);
1215                 /* This only occurs when an task abort was requested while ABTS
1216                    is in progress.  Setting the IO_CLEANUP flag will skip the
1217                    RRQ process in the case when the fw generated SCSI_CMD cmpl
1218                    was a result from the ABTS request rather than the CLEANUP
1219                    request */
1220                 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1221                 rc = FAILED;
1222                 goto done;
1223         }
1224
1225         /* Cancel the current timer running on this io_req */
1226         if (cancel_delayed_work(&io_req->timeout_work))
1227                 kref_put(&io_req->refcount,
1228                          bnx2fc_cmd_release); /* drop timer hold */
1229         set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1230         io_req->wait_for_comp = 1;
1231         rc = bnx2fc_initiate_abts(io_req);
1232         if (rc == FAILED) {
1233                 bnx2fc_initiate_cleanup(io_req);
1234                 spin_unlock_bh(&tgt->tgt_lock);
1235                 wait_for_completion(&io_req->tm_done);
1236                 spin_lock_bh(&tgt->tgt_lock);
1237                 io_req->wait_for_comp = 0;
1238                 goto done;
1239         }
1240         spin_unlock_bh(&tgt->tgt_lock);
1241
1242         /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1243         time_left = wait_for_completion_timeout(&io_req->tm_done,
1244             (2 * rp->r_a_tov + 1) * HZ);
1245         if (time_left)
1246                 BNX2FC_IO_DBG(io_req, "Timed out in eh_abort waiting for tm_done");
1247
1248         spin_lock_bh(&tgt->tgt_lock);
1249         io_req->wait_for_comp = 0;
1250         if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1251                 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1252                 rc = SUCCESS;
1253         } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1254                                       &io_req->req_flags))) {
1255                 /* Let the scsi-ml try to recover this command */
1256                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1257                        io_req->xid);
1258                 /*
1259                  * Cleanup firmware residuals before returning control back
1260                  * to SCSI ML.
1261                  */
1262                 rc = bnx2fc_abts_cleanup(io_req);
1263                 goto done;
1264         } else {
1265                 /*
1266                  * We come here even when there was a race condition
1267                  * between timeout and abts completion, and abts
1268                  * completion happens just in time.
1269                  */
1270                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1271                 rc = SUCCESS;
1272                 bnx2fc_scsi_done(io_req, DID_ABORT);
1273                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1274         }
1275 done:
1276         /* release the reference taken in eh_abort */
1277         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1278         spin_unlock_bh(&tgt->tgt_lock);
1279         return rc;
1280 }
1281
1282 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1283                                       struct fcoe_task_ctx_entry *task,
1284                                       u8 rx_state)
1285 {
1286         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1287         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1288         u32 offset = cb_arg->offset;
1289         enum fc_rctl r_ctl = cb_arg->r_ctl;
1290         int rc = 0;
1291         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1292
1293         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1294                               "cmd_type = %d\n",
1295                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1296
1297         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1298                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1299                         seq_clnp_req->xid);
1300                 goto free_cb_arg;
1301         }
1302
1303         spin_unlock_bh(&tgt->tgt_lock);
1304         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1305         spin_lock_bh(&tgt->tgt_lock);
1306
1307         if (rc)
1308                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1309                         " IO will abort\n");
1310         seq_clnp_req->cb_arg = NULL;
1311         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1312 free_cb_arg:
1313         kfree(cb_arg);
1314         return;
1315 }
1316
1317 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1318                                   struct fcoe_task_ctx_entry *task,
1319                                   u8 num_rq)
1320 {
1321         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1322                               "refcnt = %d, cmd_type = %d\n",
1323                    kref_read(&io_req->refcount), io_req->cmd_type);
1324         bnx2fc_scsi_done(io_req, DID_ERROR);
1325         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1326         if (io_req->wait_for_comp)
1327                 complete(&io_req->tm_done);
1328 }
1329
1330 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1331                                struct fcoe_task_ctx_entry *task,
1332                                u8 num_rq)
1333 {
1334         u32 r_ctl;
1335         u32 r_a_tov = FC_DEF_R_A_TOV;
1336         u8 issue_rrq = 0;
1337         struct bnx2fc_rport *tgt = io_req->tgt;
1338
1339         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1340                               "refcnt = %d, cmd_type = %d\n",
1341                    io_req->xid,
1342                    kref_read(&io_req->refcount), io_req->cmd_type);
1343
1344         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1345                                        &io_req->req_flags)) {
1346                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1347                                 " this io\n");
1348                 return;
1349         }
1350
1351         /* Do not issue RRQ as this IO is already cleanedup */
1352         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1353                                 &io_req->req_flags))
1354                 goto io_compl;
1355
1356         /*
1357          * For ABTS issued due to SCSI eh_abort_handler, timeout
1358          * values are maintained by scsi-ml itself. Cancel timeout
1359          * in case ABTS issued as part of task management function
1360          * or due to FW error.
1361          */
1362         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1363                 if (cancel_delayed_work(&io_req->timeout_work))
1364                         kref_put(&io_req->refcount,
1365                                  bnx2fc_cmd_release); /* drop timer hold */
1366
1367         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1368
1369         switch (r_ctl) {
1370         case FC_RCTL_BA_ACC:
1371                 /*
1372                  * Dont release this cmd yet. It will be relesed
1373                  * after we get RRQ response
1374                  */
1375                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1376                 issue_rrq = 1;
1377                 break;
1378
1379         case FC_RCTL_BA_RJT:
1380                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1381                 break;
1382         default:
1383                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1384                 break;
1385         }
1386
1387         if (issue_rrq) {
1388                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1389                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1390         }
1391         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1392         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1393
1394 io_compl:
1395         if (io_req->wait_for_comp) {
1396                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1397                                        &io_req->req_flags))
1398                         complete(&io_req->tm_done);
1399         } else {
1400                 /*
1401                  * We end up here when ABTS is issued as
1402                  * in asynchronous context, i.e., as part
1403                  * of task management completion, or
1404                  * when FW error is received or when the
1405                  * ABTS is issued when the IO is timed
1406                  * out.
1407                  */
1408
1409                 if (io_req->on_active_queue) {
1410                         list_del_init(&io_req->link);
1411                         io_req->on_active_queue = 0;
1412                         /* Move IO req to retire queue */
1413                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1414                 }
1415                 bnx2fc_scsi_done(io_req, DID_ERROR);
1416                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1417         }
1418 }
1419
1420 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1421 {
1422         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1423         struct bnx2fc_rport *tgt = io_req->tgt;
1424         struct bnx2fc_cmd *cmd, *tmp;
1425         u64 tm_lun = sc_cmd->device->lun;
1426         u64 lun;
1427         int rc = 0;
1428
1429         /* called with tgt_lock held */
1430         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1431         /*
1432          * Walk thru the active_ios queue and ABORT the IO
1433          * that matches with the LUN that was reset
1434          */
1435         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1436                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1437                 lun = cmd->sc_cmd->device->lun;
1438                 if (lun == tm_lun) {
1439                         /* Initiate ABTS on this cmd */
1440                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1441                                               &cmd->req_flags)) {
1442                                 /* cancel the IO timeout */
1443                                 if (cancel_delayed_work(&io_req->timeout_work))
1444                                         kref_put(&io_req->refcount,
1445                                                  bnx2fc_cmd_release);
1446                                                         /* timer hold */
1447                                 rc = bnx2fc_initiate_abts(cmd);
1448                                 /* abts shouldn't fail in this context */
1449                                 WARN_ON(rc != SUCCESS);
1450                         } else
1451                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1452                                         " progress for this IO 0x%x\n",
1453                                         cmd->xid);
1454                 }
1455         }
1456 }
1457
1458 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1459 {
1460         struct bnx2fc_rport *tgt = io_req->tgt;
1461         struct bnx2fc_cmd *cmd, *tmp;
1462         int rc = 0;
1463
1464         /* called with tgt_lock held */
1465         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_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, "TGT RST cmpl: scan for pending IOs\n");
1472                 /* Initiate ABTS */
1473                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1474                                                         &cmd->req_flags)) {
1475                         /* cancel the IO timeout */
1476                         if (cancel_delayed_work(&io_req->timeout_work))
1477                                 kref_put(&io_req->refcount,
1478                                          bnx2fc_cmd_release); /* timer hold */
1479                         rc = bnx2fc_initiate_abts(cmd);
1480                         /* abts shouldn't fail in this context */
1481                         WARN_ON(rc != SUCCESS);
1482
1483                 } else
1484                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1485                                 " for this IO 0x%x\n", cmd->xid);
1486         }
1487 }
1488
1489 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1490                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1491 {
1492         struct bnx2fc_mp_req *tm_req;
1493         struct fc_frame_header *fc_hdr;
1494         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1495         u64 *hdr;
1496         u64 *temp_hdr;
1497         void *rsp_buf;
1498
1499         /* Called with tgt_lock held */
1500         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1501
1502         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1503                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1504         else {
1505                 /* TM has already timed out and we got
1506                  * delayed completion. Ignore completion
1507                  * processing.
1508                  */
1509                 return;
1510         }
1511
1512         tm_req = &(io_req->mp_req);
1513         fc_hdr = &(tm_req->resp_fc_hdr);
1514         hdr = (u64 *)fc_hdr;
1515         temp_hdr = (u64 *)
1516                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1517         hdr[0] = cpu_to_be64(temp_hdr[0]);
1518         hdr[1] = cpu_to_be64(temp_hdr[1]);
1519         hdr[2] = cpu_to_be64(temp_hdr[2]);
1520
1521         tm_req->resp_len =
1522                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1523
1524         rsp_buf = tm_req->resp_buf;
1525
1526         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1527                 bnx2fc_parse_fcp_rsp(io_req,
1528                                      (struct fcoe_fcp_rsp_payload *)
1529                                      rsp_buf, num_rq);
1530                 if (io_req->fcp_rsp_code == 0) {
1531                         /* TM successful */
1532                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1533                                 bnx2fc_lun_reset_cmpl(io_req);
1534                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1535                                 bnx2fc_tgt_reset_cmpl(io_req);
1536                 }
1537         } else {
1538                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1539                         fc_hdr->fh_r_ctl);
1540         }
1541         if (!sc_cmd->SCp.ptr) {
1542                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1543                 return;
1544         }
1545         switch (io_req->fcp_status) {
1546         case FC_GOOD:
1547                 if (io_req->cdb_status == 0) {
1548                         /* Good IO completion */
1549                         sc_cmd->result = DID_OK << 16;
1550                 } else {
1551                         /* Transport status is good, SCSI status not good */
1552                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1553                 }
1554                 if (io_req->fcp_resid)
1555                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1556                 break;
1557
1558         default:
1559                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1560                            io_req->fcp_status);
1561                 break;
1562         }
1563
1564         sc_cmd = io_req->sc_cmd;
1565         io_req->sc_cmd = NULL;
1566
1567         /* check if the io_req exists in tgt's tmf_q */
1568         if (io_req->on_tmf_queue) {
1569
1570                 list_del_init(&io_req->link);
1571                 io_req->on_tmf_queue = 0;
1572         } else {
1573
1574                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1575                 return;
1576         }
1577
1578         sc_cmd->SCp.ptr = NULL;
1579         sc_cmd->scsi_done(sc_cmd);
1580
1581         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1582         if (io_req->wait_for_comp) {
1583                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1584                 complete(&io_req->tm_done);
1585         }
1586 }
1587
1588 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1589                            int bd_index)
1590 {
1591         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1592         int frag_size, sg_frags;
1593
1594         sg_frags = 0;
1595         while (sg_len) {
1596                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1597                         frag_size = BNX2FC_BD_SPLIT_SZ;
1598                 else
1599                         frag_size = sg_len;
1600                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1601                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1602                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1603                 bd[bd_index + sg_frags].flags = 0;
1604
1605                 addr += (u64) frag_size;
1606                 sg_frags++;
1607                 sg_len -= frag_size;
1608         }
1609         return sg_frags;
1610
1611 }
1612
1613 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1614 {
1615         struct bnx2fc_interface *interface = io_req->port->priv;
1616         struct bnx2fc_hba *hba = interface->hba;
1617         struct scsi_cmnd *sc = io_req->sc_cmd;
1618         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1619         struct scatterlist *sg;
1620         int byte_count = 0;
1621         int sg_count = 0;
1622         int bd_count = 0;
1623         int sg_frags;
1624         unsigned int sg_len;
1625         u64 addr;
1626         int i;
1627
1628         /*
1629          * Use dma_map_sg directly to ensure we're using the correct
1630          * dev struct off of pcidev.
1631          */
1632         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1633                               scsi_sg_count(sc), sc->sc_data_direction);
1634         scsi_for_each_sg(sc, sg, sg_count, i) {
1635                 sg_len = sg_dma_len(sg);
1636                 addr = sg_dma_address(sg);
1637                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1638                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1639                                                    bd_count);
1640                 } else {
1641
1642                         sg_frags = 1;
1643                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1644                         bd[bd_count].buf_addr_hi  = addr >> 32;
1645                         bd[bd_count].buf_len = (u16)sg_len;
1646                         bd[bd_count].flags = 0;
1647                 }
1648                 bd_count += sg_frags;
1649                 byte_count += sg_len;
1650         }
1651         if (byte_count != scsi_bufflen(sc))
1652                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1653                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1654                         io_req->xid);
1655         return bd_count;
1656 }
1657
1658 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1659 {
1660         struct scsi_cmnd *sc = io_req->sc_cmd;
1661         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1662         int bd_count;
1663
1664         if (scsi_sg_count(sc)) {
1665                 bd_count = bnx2fc_map_sg(io_req);
1666                 if (bd_count == 0)
1667                         return -ENOMEM;
1668         } else {
1669                 bd_count = 0;
1670                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1671                 bd[0].buf_len = bd[0].flags = 0;
1672         }
1673         io_req->bd_tbl->bd_valid = bd_count;
1674
1675         return 0;
1676 }
1677
1678 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1679 {
1680         struct scsi_cmnd *sc = io_req->sc_cmd;
1681         struct bnx2fc_interface *interface = io_req->port->priv;
1682         struct bnx2fc_hba *hba = interface->hba;
1683
1684         /*
1685          * Use dma_unmap_sg directly to ensure we're using the correct
1686          * dev struct off of pcidev.
1687          */
1688         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1689                 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1690                     scsi_sg_count(sc), sc->sc_data_direction);
1691                 io_req->bd_tbl->bd_valid = 0;
1692         }
1693 }
1694
1695 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1696                                   struct fcp_cmnd *fcp_cmnd)
1697 {
1698         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1699
1700         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1701
1702         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1703
1704         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1705         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1706
1707         fcp_cmnd->fc_cmdref = 0;
1708         fcp_cmnd->fc_pri_ta = 0;
1709         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1710         fcp_cmnd->fc_flags = io_req->io_req_flags;
1711         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1712 }
1713
1714 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1715                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1716                                  u8 num_rq)
1717 {
1718         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1719         struct bnx2fc_rport *tgt = io_req->tgt;
1720         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1721         u32 rq_buff_len = 0;
1722         int i;
1723         unsigned char *rq_data;
1724         unsigned char *dummy;
1725         int fcp_sns_len = 0;
1726         int fcp_rsp_len = 0;
1727
1728         io_req->fcp_status = FC_GOOD;
1729         io_req->fcp_resid = 0;
1730         if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1731             FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1732                 io_req->fcp_resid = fcp_rsp->fcp_resid;
1733
1734         io_req->scsi_comp_flags = rsp_flags;
1735         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1736                                 fcp_rsp->scsi_status_code;
1737
1738         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1739         if (num_rq) {
1740
1741                 /*
1742                  * We do not anticipate num_rq >1, as the linux defined
1743                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1744                  * 256 bytes of single rq buffer is good enough to hold this.
1745                  */
1746
1747                 if (rsp_flags &
1748                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1749                         fcp_rsp_len = rq_buff_len
1750                                         = fcp_rsp->fcp_rsp_len;
1751                 }
1752
1753                 if (rsp_flags &
1754                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1755                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1756                         rq_buff_len += fcp_rsp->fcp_sns_len;
1757                 }
1758
1759                 io_req->fcp_rsp_len = fcp_rsp_len;
1760                 io_req->fcp_sns_len = fcp_sns_len;
1761
1762                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1763                         /* Invalid sense sense length. */
1764                         printk(KERN_ERR PFX "invalid sns length %d\n",
1765                                 rq_buff_len);
1766                         /* reset rq_buff_len */
1767                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1768                 }
1769
1770                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1771
1772                 if (num_rq > 1) {
1773                         /* We do not need extra sense data */
1774                         for (i = 1; i < num_rq; i++)
1775                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1776                 }
1777
1778                 /* fetch fcp_rsp_code */
1779                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1780                         /* Only for task management function */
1781                         io_req->fcp_rsp_code = rq_data[3];
1782                         BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1783                                 io_req->fcp_rsp_code);
1784                 }
1785
1786                 /* fetch sense data */
1787                 rq_data += fcp_rsp_len;
1788
1789                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1790                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1791                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1792                 }
1793
1794                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1795                 if (fcp_sns_len)
1796                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1797
1798                 /* return RQ entries */
1799                 for (i = 0; i < num_rq; i++)
1800                         bnx2fc_return_rqe(tgt, 1);
1801         }
1802 }
1803
1804 /**
1805  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1806  *
1807  * @host:       The Scsi_Host the command was issued to
1808  * @sc_cmd:     struct scsi_cmnd to be executed
1809  *
1810  * This is the IO strategy routine, called by SCSI-ML
1811  **/
1812 int bnx2fc_queuecommand(struct Scsi_Host *host,
1813                         struct scsi_cmnd *sc_cmd)
1814 {
1815         struct fc_lport *lport = shost_priv(host);
1816         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1817         struct fc_rport_libfc_priv *rp = rport->dd_data;
1818         struct bnx2fc_rport *tgt;
1819         struct bnx2fc_cmd *io_req;
1820         int rc = 0;
1821         int rval;
1822
1823         rval = fc_remote_port_chkready(rport);
1824         if (rval) {
1825                 sc_cmd->result = rval;
1826                 sc_cmd->scsi_done(sc_cmd);
1827                 return 0;
1828         }
1829
1830         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1831                 rc = SCSI_MLQUEUE_HOST_BUSY;
1832                 goto exit_qcmd;
1833         }
1834
1835         /* rport and tgt are allocated together, so tgt should be non-NULL */
1836         tgt = (struct bnx2fc_rport *)&rp[1];
1837
1838         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1839                 /*
1840                  * Session is not offloaded yet. Let SCSI-ml retry
1841                  * the command.
1842                  */
1843                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1844                 goto exit_qcmd;
1845         }
1846         if (tgt->retry_delay_timestamp) {
1847                 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1848                         tgt->retry_delay_timestamp = 0;
1849                 } else {
1850                         /* If retry_delay timer is active, flow off the ML */
1851                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1852                         goto exit_qcmd;
1853                 }
1854         }
1855
1856         spin_lock_bh(&tgt->tgt_lock);
1857
1858         io_req = bnx2fc_cmd_alloc(tgt);
1859         if (!io_req) {
1860                 rc = SCSI_MLQUEUE_HOST_BUSY;
1861                 goto exit_qcmd_tgtlock;
1862         }
1863         io_req->sc_cmd = sc_cmd;
1864
1865         if (bnx2fc_post_io_req(tgt, io_req)) {
1866                 printk(KERN_ERR PFX "Unable to post io_req\n");
1867                 rc = SCSI_MLQUEUE_HOST_BUSY;
1868                 goto exit_qcmd_tgtlock;
1869         }
1870
1871 exit_qcmd_tgtlock:
1872         spin_unlock_bh(&tgt->tgt_lock);
1873 exit_qcmd:
1874         return rc;
1875 }
1876
1877 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1878                                    struct fcoe_task_ctx_entry *task,
1879                                    u8 num_rq)
1880 {
1881         struct fcoe_fcp_rsp_payload *fcp_rsp;
1882         struct bnx2fc_rport *tgt = io_req->tgt;
1883         struct scsi_cmnd *sc_cmd;
1884         struct Scsi_Host *host;
1885
1886
1887         /* scsi_cmd_cmpl is called with tgt lock held */
1888
1889         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1890                 /* we will not receive ABTS response for this IO */
1891                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1892                            "this scsi cmd\n");
1893                 return;
1894         }
1895
1896         /* Cancel the timeout_work, as we received IO completion */
1897         if (cancel_delayed_work(&io_req->timeout_work))
1898                 kref_put(&io_req->refcount,
1899                          bnx2fc_cmd_release); /* drop timer hold */
1900
1901         sc_cmd = io_req->sc_cmd;
1902         if (sc_cmd == NULL) {
1903                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1904                 return;
1905         }
1906
1907         /* Fetch fcp_rsp from task context and perform cmd completion */
1908         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1909                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1910
1911         /* parse fcp_rsp and obtain sense data from RQ if available */
1912         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1913
1914         host = sc_cmd->device->host;
1915         if (!sc_cmd->SCp.ptr) {
1916                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1917                 return;
1918         }
1919
1920         if (io_req->on_active_queue) {
1921                 list_del_init(&io_req->link);
1922                 io_req->on_active_queue = 0;
1923                 /* Move IO req to retire queue */
1924                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1925         } else {
1926                 /* This should not happen, but could have been pulled
1927                  * by bnx2fc_flush_active_ios(), or during a race
1928                  * between command abort and (late) completion.
1929                  */
1930                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1931                 if (io_req->wait_for_comp)
1932                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1933                                                &io_req->req_flags))
1934                                 complete(&io_req->tm_done);
1935         }
1936
1937         bnx2fc_unmap_sg_list(io_req);
1938         io_req->sc_cmd = NULL;
1939
1940         switch (io_req->fcp_status) {
1941         case FC_GOOD:
1942                 if (io_req->cdb_status == 0) {
1943                         /* Good IO completion */
1944                         sc_cmd->result = DID_OK << 16;
1945                 } else {
1946                         /* Transport status is good, SCSI status not good */
1947                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1948                                  " fcp_resid = 0x%x\n",
1949                                 io_req->cdb_status, io_req->fcp_resid);
1950                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1951
1952                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1953                             io_req->cdb_status == SAM_STAT_BUSY) {
1954                                 /* Set the jiffies + retry_delay_timer * 100ms
1955                                    for the rport/tgt */
1956                                 tgt->retry_delay_timestamp = jiffies +
1957                                         fcp_rsp->retry_delay_timer * HZ / 10;
1958                         }
1959
1960                 }
1961                 if (io_req->fcp_resid)
1962                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1963                 break;
1964         default:
1965                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1966                         io_req->fcp_status);
1967                 break;
1968         }
1969         sc_cmd->SCp.ptr = NULL;
1970         sc_cmd->scsi_done(sc_cmd);
1971         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1972 }
1973
1974 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1975                                struct bnx2fc_cmd *io_req)
1976 {
1977         struct fcoe_task_ctx_entry *task;
1978         struct fcoe_task_ctx_entry *task_page;
1979         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1980         struct fcoe_port *port = tgt->port;
1981         struct bnx2fc_interface *interface = port->priv;
1982         struct bnx2fc_hba *hba = interface->hba;
1983         struct fc_lport *lport = port->lport;
1984         struct fc_stats *stats;
1985         int task_idx, index;
1986         u16 xid;
1987
1988         /* bnx2fc_post_io_req() is called with the tgt_lock held */
1989
1990         /* Initialize rest of io_req fields */
1991         io_req->cmd_type = BNX2FC_SCSI_CMD;
1992         io_req->port = port;
1993         io_req->tgt = tgt;
1994         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1995         sc_cmd->SCp.ptr = (char *)io_req;
1996
1997         stats = per_cpu_ptr(lport->stats, get_cpu());
1998         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1999                 io_req->io_req_flags = BNX2FC_READ;
2000                 stats->InputRequests++;
2001                 stats->InputBytes += io_req->data_xfer_len;
2002         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2003                 io_req->io_req_flags = BNX2FC_WRITE;
2004                 stats->OutputRequests++;
2005                 stats->OutputBytes += io_req->data_xfer_len;
2006         } else {
2007                 io_req->io_req_flags = 0;
2008                 stats->ControlRequests++;
2009         }
2010         put_cpu();
2011
2012         xid = io_req->xid;
2013
2014         /* Build buffer descriptor list for firmware from sg list */
2015         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2016                 printk(KERN_ERR PFX "BD list creation failed\n");
2017                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2018                 return -EAGAIN;
2019         }
2020
2021         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2022         index = xid % BNX2FC_TASKS_PER_PAGE;
2023
2024         /* Initialize task context for this IO request */
2025         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2026         task = &(task_page[index]);
2027         bnx2fc_init_task(io_req, task);
2028
2029         if (tgt->flush_in_prog) {
2030                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2031                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2032                 return -EAGAIN;
2033         }
2034
2035         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2036                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2037                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2038                 return -EAGAIN;
2039         }
2040
2041         /* Time IO req */
2042         if (tgt->io_timeout)
2043                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2044         /* Obtain free SQ entry */
2045         bnx2fc_add_2_sq(tgt, xid);
2046
2047         /* Enqueue the io_req to active_cmd_queue */
2048
2049         io_req->on_active_queue = 1;
2050         /* move io_req from pending_queue to active_queue */
2051         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2052
2053         /* Ring doorbell */
2054         bnx2fc_ring_doorbell(tgt);
2055         return 0;
2056 }