drivers/scsi/bnx2fc/bnx2fc

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
bnx2fc_cmd_timer_set
bnx2fc_cmd_timeout
bnx2fc_scsi_done
bnx2fc_cmd_mgr_alloc
bnx2fc_cmd_mgr_free
bnx2fc_elstm_alloc
bnx2fc_cmd_alloc
bnx2fc_cmd_release
bnx2fc_free_mp_resc
bnx2fc_init_mp_req
bnx2fc_initiate_tmf
bnx2fc_initiate_abts
bnx2fc_initiate_seq_cleanup
bnx2fc_initiate_cleanup
bnx2fc_eh_target_reset
bnx2fc_eh_device_reset
bnx2fc_abts_cleanup
bnx2fc_eh_abort
bnx2fc_process_seq_cleanup_compl
bnx2fc_process_cleanup_compl
bnx2fc_process_abts_compl
bnx2fc_lun_reset_cmpl
bnx2fc_tgt_reset_cmpl
bnx2fc_process_tm_compl
bnx2fc_split_bd
bnx2fc_map_sg
bnx2fc_build_bd_list_from_sg
bnx2fc_unmap_sg_list
bnx2fc_build_fcp_cmnd
bnx2fc_parse_fcp_rsp
bnx2fc_queuecommand
bnx2fc_process_scsi_cmd_compl
bnx2fc_post_io_req
   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 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 
 951         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 952         if (!cb_arg) {
 953                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 954                 rc = -ENOMEM;
 955                 goto cleanup_err;
 956         }
 957 
 958         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 959         if (!seq_clnp_req) {
 960                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 961                 rc = -ENOMEM;
 962                 kfree(cb_arg);
 963                 goto cleanup_err;
 964         }
 965         /* Initialize rest of io_req fields */
 966         seq_clnp_req->sc_cmd = NULL;
 967         seq_clnp_req->port = port;
 968         seq_clnp_req->tgt = tgt;
 969         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 970 
 971         xid = seq_clnp_req->xid;
 972 
 973         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 974         index = xid % BNX2FC_TASKS_PER_PAGE;
 975 
 976         /* Initialize task context for this IO request */
 977         task_page = (struct fcoe_task_ctx_entry *)
 978                      interface->hba->task_ctx[task_idx];
 979         task = &(task_page[index]);
 980         cb_arg->aborted_io_req = orig_io_req;
 981         cb_arg->io_req = seq_clnp_req;
 982         cb_arg->r_ctl = r_ctl;
 983         cb_arg->offset = offset;
 984         seq_clnp_req->cb_arg = cb_arg;
 985 
 986         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 987         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 988 
 989         /* Obtain free SQ entry */
 990         bnx2fc_add_2_sq(tgt, xid);
 991 
 992         /* Ring doorbell */
 993         bnx2fc_ring_doorbell(tgt);
 994 cleanup_err:
 995         return rc;
 996 }
 997 
 998 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
 999 {
1000         struct bnx2fc_rport *tgt = io_req->tgt;
1001         struct bnx2fc_interface *interface;
1002         struct fcoe_port *port;
1003         struct bnx2fc_cmd *cleanup_io_req;
1004         struct fcoe_task_ctx_entry *task;
1005         struct fcoe_task_ctx_entry *task_page;
1006         int task_idx, index;
1007         u16 xid, orig_xid;
1008         int rc = 0;
1009 
1010         /* ASSUMPTION: called with tgt_lock held */
1011         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1012 
1013         port = io_req->port;
1014         interface = port->priv;
1015 
1016         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1017         if (!cleanup_io_req) {
1018                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1019                 rc = -1;
1020                 goto cleanup_err;
1021         }
1022 
1023         /* Initialize rest of io_req fields */
1024         cleanup_io_req->sc_cmd = NULL;
1025         cleanup_io_req->port = port;
1026         cleanup_io_req->tgt = tgt;
1027         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1028 
1029         xid = cleanup_io_req->xid;
1030 
1031         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1032         index = xid % BNX2FC_TASKS_PER_PAGE;
1033 
1034         /* Initialize task context for this IO request */
1035         task_page = (struct fcoe_task_ctx_entry *)
1036                         interface->hba->task_ctx[task_idx];
1037         task = &(task_page[index]);
1038         orig_xid = io_req->xid;
1039 
1040         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1041 
1042         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1043 
1044         /* Obtain free SQ entry */
1045         bnx2fc_add_2_sq(tgt, xid);
1046 
1047         /* Set flag that cleanup request is pending with the firmware */
1048         set_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
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         unsigned int time_left;
1087 
1088         init_completion(&io_req->cleanup_done);
1089         io_req->wait_for_cleanup_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->cleanup_done,
1099                                                 BNX2FC_FW_TIMEOUT);
1100         if (!time_left) {
1101                 BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1102                               __func__);
1103 
1104                 /*
1105                  * Put the extra reference to the SCSI command since it would
1106                  * not have been returned in this case.
1107                  */
1108                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1109         }
1110 
1111         spin_lock_bh(&tgt->tgt_lock);
1112         io_req->wait_for_cleanup_comp = 0;
1113         return SUCCESS;
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->abts_done);
1202         init_completion(&io_req->cleanup_done);
1203 
1204         if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1205                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1206                                 "already in abts processing\n", io_req->xid);
1207                 if (cancel_delayed_work(&io_req->timeout_work))
1208                         kref_put(&io_req->refcount,
1209                                  bnx2fc_cmd_release); /* drop timer hold */
1210                 /*
1211                  * We don't want to hold off the upper layer timer so simply
1212                  * cleanup the command and return that I/O was successfully
1213                  * aborted.
1214                  */
1215                 rc = bnx2fc_abts_cleanup(io_req);
1216                 /* This only occurs when an task abort was requested while ABTS
1217                    is in progress.  Setting the IO_CLEANUP flag will skip the
1218                    RRQ process in the case when the fw generated SCSI_CMD cmpl
1219                    was a result from the ABTS request rather than the CLEANUP
1220                    request */
1221                 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
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_abts_comp = 1;
1231         rc = bnx2fc_initiate_abts(io_req);
1232         if (rc == FAILED) {
1233                 io_req->wait_for_cleanup_comp = 1;
1234                 bnx2fc_initiate_cleanup(io_req);
1235                 spin_unlock_bh(&tgt->tgt_lock);
1236                 wait_for_completion(&io_req->cleanup_done);
1237                 spin_lock_bh(&tgt->tgt_lock);
1238                 io_req->wait_for_cleanup_comp = 0;
1239                 goto done;
1240         }
1241         spin_unlock_bh(&tgt->tgt_lock);
1242 
1243         /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1244         time_left = wait_for_completion_timeout(&io_req->abts_done,
1245                                                 (2 * rp->r_a_tov + 1) * HZ);
1246         if (time_left)
1247                 BNX2FC_IO_DBG(io_req,
1248                               "Timed out in eh_abort waiting for abts_done");
1249 
1250         spin_lock_bh(&tgt->tgt_lock);
1251         io_req->wait_for_abts_comp = 0;
1252         if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1253                 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1254                 rc = SUCCESS;
1255         } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1256                                       &io_req->req_flags))) {
1257                 /* Let the scsi-ml try to recover this command */
1258                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1259                        io_req->xid);
1260                 /*
1261                  * Cleanup firmware residuals before returning control back
1262                  * to SCSI ML.
1263                  */
1264                 rc = bnx2fc_abts_cleanup(io_req);
1265                 goto done;
1266         } else {
1267                 /*
1268                  * We come here even when there was a race condition
1269                  * between timeout and abts completion, and abts
1270                  * completion happens just in time.
1271                  */
1272                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1273                 rc = SUCCESS;
1274                 bnx2fc_scsi_done(io_req, DID_ABORT);
1275                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1276         }
1277 done:
1278         /* release the reference taken in eh_abort */
1279         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1280         spin_unlock_bh(&tgt->tgt_lock);
1281         return rc;
1282 }
1283 
1284 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1285                                       struct fcoe_task_ctx_entry *task,
1286                                       u8 rx_state)
1287 {
1288         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1289         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1290         u32 offset = cb_arg->offset;
1291         enum fc_rctl r_ctl = cb_arg->r_ctl;
1292         int rc = 0;
1293         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1294 
1295         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1296                               "cmd_type = %d\n",
1297                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1298 
1299         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1300                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1301                         seq_clnp_req->xid);
1302                 goto free_cb_arg;
1303         }
1304 
1305         spin_unlock_bh(&tgt->tgt_lock);
1306         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1307         spin_lock_bh(&tgt->tgt_lock);
1308 
1309         if (rc)
1310                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1311                         " IO will abort\n");
1312         seq_clnp_req->cb_arg = NULL;
1313         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1314 free_cb_arg:
1315         kfree(cb_arg);
1316         return;
1317 }
1318 
1319 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1320                                   struct fcoe_task_ctx_entry *task,
1321                                   u8 num_rq)
1322 {
1323         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1324                               "refcnt = %d, cmd_type = %d\n",
1325                    kref_read(&io_req->refcount), io_req->cmd_type);
1326         /*
1327          * Test whether there is a cleanup request pending. If not just
1328          * exit.
1329          */
1330         if (!test_and_clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ,
1331                                 &io_req->req_flags))
1332                 return;
1333         /*
1334          * If we receive a cleanup completion for this request then the
1335          * firmware will not give us an abort completion for this request
1336          * so clear any ABTS pending flags.
1337          */
1338         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags) &&
1339             !test_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags)) {
1340                 set_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags);
1341                 if (io_req->wait_for_abts_comp)
1342                         complete(&io_req->abts_done);
1343         }
1344 
1345         bnx2fc_scsi_done(io_req, DID_ERROR);
1346         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1347         if (io_req->wait_for_cleanup_comp)
1348                 complete(&io_req->cleanup_done);
1349 }
1350 
1351 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1352                                struct fcoe_task_ctx_entry *task,
1353                                u8 num_rq)
1354 {
1355         u32 r_ctl;
1356         u32 r_a_tov = FC_DEF_R_A_TOV;
1357         u8 issue_rrq = 0;
1358         struct bnx2fc_rport *tgt = io_req->tgt;
1359 
1360         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1361                               "refcnt = %d, cmd_type = %d\n",
1362                    io_req->xid,
1363                    kref_read(&io_req->refcount), io_req->cmd_type);
1364 
1365         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1366                                        &io_req->req_flags)) {
1367                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1368                                 " this io\n");
1369                 return;
1370         }
1371 
1372         /*
1373          * If we receive an ABTS completion here then we will not receive
1374          * a cleanup completion so clear any cleanup pending flags.
1375          */
1376         if (test_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags)) {
1377                 clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1378                 if (io_req->wait_for_cleanup_comp)
1379                         complete(&io_req->cleanup_done);
1380         }
1381 
1382         /* Do not issue RRQ as this IO is already cleanedup */
1383         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1384                                 &io_req->req_flags))
1385                 goto io_compl;
1386 
1387         /*
1388          * For ABTS issued due to SCSI eh_abort_handler, timeout
1389          * values are maintained by scsi-ml itself. Cancel timeout
1390          * in case ABTS issued as part of task management function
1391          * or due to FW error.
1392          */
1393         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1394                 if (cancel_delayed_work(&io_req->timeout_work))
1395                         kref_put(&io_req->refcount,
1396                                  bnx2fc_cmd_release); /* drop timer hold */
1397 
1398         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1399 
1400         switch (r_ctl) {
1401         case FC_RCTL_BA_ACC:
1402                 /*
1403                  * Dont release this cmd yet. It will be relesed
1404                  * after we get RRQ response
1405                  */
1406                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1407                 issue_rrq = 1;
1408                 break;
1409 
1410         case FC_RCTL_BA_RJT:
1411                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1412                 break;
1413         default:
1414                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1415                 break;
1416         }
1417 
1418         if (issue_rrq) {
1419                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1420                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1421         }
1422         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1423         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1424 
1425 io_compl:
1426         if (io_req->wait_for_abts_comp) {
1427                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1428                                        &io_req->req_flags))
1429                         complete(&io_req->abts_done);
1430         } else {
1431                 /*
1432                  * We end up here when ABTS is issued as
1433                  * in asynchronous context, i.e., as part
1434                  * of task management completion, or
1435                  * when FW error is received or when the
1436                  * ABTS is issued when the IO is timed
1437                  * out.
1438                  */
1439 
1440                 if (io_req->on_active_queue) {
1441                         list_del_init(&io_req->link);
1442                         io_req->on_active_queue = 0;
1443                         /* Move IO req to retire queue */
1444                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1445                 }
1446                 bnx2fc_scsi_done(io_req, DID_ERROR);
1447                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1448         }
1449 }
1450 
1451 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1452 {
1453         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1454         struct bnx2fc_rport *tgt = io_req->tgt;
1455         struct bnx2fc_cmd *cmd, *tmp;
1456         u64 tm_lun = sc_cmd->device->lun;
1457         u64 lun;
1458         int rc = 0;
1459 
1460         /* called with tgt_lock held */
1461         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1462         /*
1463          * Walk thru the active_ios queue and ABORT the IO
1464          * that matches with the LUN that was reset
1465          */
1466         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1467                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1468                 lun = cmd->sc_cmd->device->lun;
1469                 if (lun == tm_lun) {
1470                         /* Initiate ABTS on this cmd */
1471                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1472                                               &cmd->req_flags)) {
1473                                 /* cancel the IO timeout */
1474                                 if (cancel_delayed_work(&io_req->timeout_work))
1475                                         kref_put(&io_req->refcount,
1476                                                  bnx2fc_cmd_release);
1477                                                         /* timer hold */
1478                                 rc = bnx2fc_initiate_abts(cmd);
1479                                 /* abts shouldn't fail in this context */
1480                                 WARN_ON(rc != SUCCESS);
1481                         } else
1482                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1483                                         " progress for this IO 0x%x\n",
1484                                         cmd->xid);
1485                 }
1486         }
1487 }
1488 
1489 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1490 {
1491         struct bnx2fc_rport *tgt = io_req->tgt;
1492         struct bnx2fc_cmd *cmd, *tmp;
1493         int rc = 0;
1494 
1495         /* called with tgt_lock held */
1496         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1497         /*
1498          * Walk thru the active_ios queue and ABORT the IO
1499          * that matches with the LUN that was reset
1500          */
1501         list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1502                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1503                 /* Initiate ABTS */
1504                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1505                                                         &cmd->req_flags)) {
1506                         /* cancel the IO timeout */
1507                         if (cancel_delayed_work(&io_req->timeout_work))
1508                                 kref_put(&io_req->refcount,
1509                                          bnx2fc_cmd_release); /* timer hold */
1510                         rc = bnx2fc_initiate_abts(cmd);
1511                         /* abts shouldn't fail in this context */
1512                         WARN_ON(rc != SUCCESS);
1513 
1514                 } else
1515                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1516                                 " for this IO 0x%x\n", cmd->xid);
1517         }
1518 }
1519 
1520 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1521                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1522 {
1523         struct bnx2fc_mp_req *tm_req;
1524         struct fc_frame_header *fc_hdr;
1525         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1526         u64 *hdr;
1527         u64 *temp_hdr;
1528         void *rsp_buf;
1529 
1530         /* Called with tgt_lock held */
1531         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1532 
1533         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1534                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1535         else {
1536                 /* TM has already timed out and we got
1537                  * delayed completion. Ignore completion
1538                  * processing.
1539                  */
1540                 return;
1541         }
1542 
1543         tm_req = &(io_req->mp_req);
1544         fc_hdr = &(tm_req->resp_fc_hdr);
1545         hdr = (u64 *)fc_hdr;
1546         temp_hdr = (u64 *)
1547                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1548         hdr[0] = cpu_to_be64(temp_hdr[0]);
1549         hdr[1] = cpu_to_be64(temp_hdr[1]);
1550         hdr[2] = cpu_to_be64(temp_hdr[2]);
1551 
1552         tm_req->resp_len =
1553                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1554 
1555         rsp_buf = tm_req->resp_buf;
1556 
1557         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1558                 bnx2fc_parse_fcp_rsp(io_req,
1559                                      (struct fcoe_fcp_rsp_payload *)
1560                                      rsp_buf, num_rq);
1561                 if (io_req->fcp_rsp_code == 0) {
1562                         /* TM successful */
1563                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1564                                 bnx2fc_lun_reset_cmpl(io_req);
1565                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1566                                 bnx2fc_tgt_reset_cmpl(io_req);
1567                 }
1568         } else {
1569                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1570                         fc_hdr->fh_r_ctl);
1571         }
1572         if (!sc_cmd->SCp.ptr) {
1573                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1574                 return;
1575         }
1576         switch (io_req->fcp_status) {
1577         case FC_GOOD:
1578                 if (io_req->cdb_status == 0) {
1579                         /* Good IO completion */
1580                         sc_cmd->result = DID_OK << 16;
1581                 } else {
1582                         /* Transport status is good, SCSI status not good */
1583                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1584                 }
1585                 if (io_req->fcp_resid)
1586                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1587                 break;
1588 
1589         default:
1590                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1591                            io_req->fcp_status);
1592                 break;
1593         }
1594 
1595         sc_cmd = io_req->sc_cmd;
1596         io_req->sc_cmd = NULL;
1597 
1598         /* check if the io_req exists in tgt's tmf_q */
1599         if (io_req->on_tmf_queue) {
1600 
1601                 list_del_init(&io_req->link);
1602                 io_req->on_tmf_queue = 0;
1603         } else {
1604 
1605                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1606                 return;
1607         }
1608 
1609         sc_cmd->SCp.ptr = NULL;
1610         sc_cmd->scsi_done(sc_cmd);
1611 
1612         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1613         if (io_req->wait_for_abts_comp) {
1614                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1615                 complete(&io_req->abts_done);
1616         }
1617 }
1618 
1619 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1620                            int bd_index)
1621 {
1622         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1623         int frag_size, sg_frags;
1624 
1625         sg_frags = 0;
1626         while (sg_len) {
1627                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1628                         frag_size = BNX2FC_BD_SPLIT_SZ;
1629                 else
1630                         frag_size = sg_len;
1631                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1632                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1633                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1634                 bd[bd_index + sg_frags].flags = 0;
1635 
1636                 addr += (u64) frag_size;
1637                 sg_frags++;
1638                 sg_len -= frag_size;
1639         }
1640         return sg_frags;
1641 
1642 }
1643 
1644 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1645 {
1646         struct bnx2fc_interface *interface = io_req->port->priv;
1647         struct bnx2fc_hba *hba = interface->hba;
1648         struct scsi_cmnd *sc = io_req->sc_cmd;
1649         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1650         struct scatterlist *sg;
1651         int byte_count = 0;
1652         int sg_count = 0;
1653         int bd_count = 0;
1654         int sg_frags;
1655         unsigned int sg_len;
1656         u64 addr;
1657         int i;
1658 
1659         WARN_ON(scsi_sg_count(sc) > BNX2FC_MAX_BDS_PER_CMD);
1660         /*
1661          * Use dma_map_sg directly to ensure we're using the correct
1662          * dev struct off of pcidev.
1663          */
1664         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1665                               scsi_sg_count(sc), sc->sc_data_direction);
1666         scsi_for_each_sg(sc, sg, sg_count, i) {
1667                 sg_len = sg_dma_len(sg);
1668                 addr = sg_dma_address(sg);
1669                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1670                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1671                                                    bd_count);
1672                 } else {
1673 
1674                         sg_frags = 1;
1675                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1676                         bd[bd_count].buf_addr_hi  = addr >> 32;
1677                         bd[bd_count].buf_len = (u16)sg_len;
1678                         bd[bd_count].flags = 0;
1679                 }
1680                 bd_count += sg_frags;
1681                 byte_count += sg_len;
1682         }
1683         if (byte_count != scsi_bufflen(sc))
1684                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1685                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1686                         io_req->xid);
1687         return bd_count;
1688 }
1689 
1690 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1691 {
1692         struct scsi_cmnd *sc = io_req->sc_cmd;
1693         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1694         int bd_count;
1695 
1696         if (scsi_sg_count(sc)) {
1697                 bd_count = bnx2fc_map_sg(io_req);
1698                 if (bd_count == 0)
1699                         return -ENOMEM;
1700         } else {
1701                 bd_count = 0;
1702                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1703                 bd[0].buf_len = bd[0].flags = 0;
1704         }
1705         io_req->bd_tbl->bd_valid = bd_count;
1706 
1707         /*
1708          * Return the command to ML if BD count exceeds the max number
1709          * that can be handled by FW.
1710          */
1711         if (bd_count > BNX2FC_FW_MAX_BDS_PER_CMD) {
1712                 pr_err("bd_count = %d exceeded FW supported max BD(255), task_id = 0x%x\n",
1713                        bd_count, io_req->xid);
1714                 return -ENOMEM;
1715         }
1716 
1717         return 0;
1718 }
1719 
1720 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1721 {
1722         struct scsi_cmnd *sc = io_req->sc_cmd;
1723         struct bnx2fc_interface *interface = io_req->port->priv;
1724         struct bnx2fc_hba *hba = interface->hba;
1725 
1726         /*
1727          * Use dma_unmap_sg directly to ensure we're using the correct
1728          * dev struct off of pcidev.
1729          */
1730         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1731                 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1732                     scsi_sg_count(sc), sc->sc_data_direction);
1733                 io_req->bd_tbl->bd_valid = 0;
1734         }
1735 }
1736 
1737 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1738                                   struct fcp_cmnd *fcp_cmnd)
1739 {
1740         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1741 
1742         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1743 
1744         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1745 
1746         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1747         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1748 
1749         fcp_cmnd->fc_cmdref = 0;
1750         fcp_cmnd->fc_pri_ta = 0;
1751         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1752         fcp_cmnd->fc_flags = io_req->io_req_flags;
1753         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1754 }
1755 
1756 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1757                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1758                                  u8 num_rq)
1759 {
1760         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1761         struct bnx2fc_rport *tgt = io_req->tgt;
1762         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1763         u32 rq_buff_len = 0;
1764         int i;
1765         unsigned char *rq_data;
1766         unsigned char *dummy;
1767         int fcp_sns_len = 0;
1768         int fcp_rsp_len = 0;
1769 
1770         io_req->fcp_status = FC_GOOD;
1771         io_req->fcp_resid = 0;
1772         if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1773             FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1774                 io_req->fcp_resid = fcp_rsp->fcp_resid;
1775 
1776         io_req->scsi_comp_flags = rsp_flags;
1777         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1778                                 fcp_rsp->scsi_status_code;
1779 
1780         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1781         if (num_rq) {
1782 
1783                 /*
1784                  * We do not anticipate num_rq >1, as the linux defined
1785                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1786                  * 256 bytes of single rq buffer is good enough to hold this.
1787                  */
1788 
1789                 if (rsp_flags &
1790                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1791                         fcp_rsp_len = rq_buff_len
1792                                         = fcp_rsp->fcp_rsp_len;
1793                 }
1794 
1795                 if (rsp_flags &
1796                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1797                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1798                         rq_buff_len += fcp_rsp->fcp_sns_len;
1799                 }
1800 
1801                 io_req->fcp_rsp_len = fcp_rsp_len;
1802                 io_req->fcp_sns_len = fcp_sns_len;
1803 
1804                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1805                         /* Invalid sense sense length. */
1806                         printk(KERN_ERR PFX "invalid sns length %d\n",
1807                                 rq_buff_len);
1808                         /* reset rq_buff_len */
1809                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1810                 }
1811 
1812                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1813 
1814                 if (num_rq > 1) {
1815                         /* We do not need extra sense data */
1816                         for (i = 1; i < num_rq; i++)
1817                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1818                 }
1819 
1820                 /* fetch fcp_rsp_code */
1821                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1822                         /* Only for task management function */
1823                         io_req->fcp_rsp_code = rq_data[3];
1824                         BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1825                                 io_req->fcp_rsp_code);
1826                 }
1827 
1828                 /* fetch sense data */
1829                 rq_data += fcp_rsp_len;
1830 
1831                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1832                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1833                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1834                 }
1835 
1836                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1837                 if (fcp_sns_len)
1838                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1839 
1840                 /* return RQ entries */
1841                 for (i = 0; i < num_rq; i++)
1842                         bnx2fc_return_rqe(tgt, 1);
1843         }
1844 }
1845 
1846 /**
1847  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1848  *
1849  * @host:       The Scsi_Host the command was issued to
1850  * @sc_cmd:     struct scsi_cmnd to be executed
1851  *
1852  * This is the IO strategy routine, called by SCSI-ML
1853  **/
1854 int bnx2fc_queuecommand(struct Scsi_Host *host,
1855                         struct scsi_cmnd *sc_cmd)
1856 {
1857         struct fc_lport *lport = shost_priv(host);
1858         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1859         struct fc_rport_libfc_priv *rp = rport->dd_data;
1860         struct bnx2fc_rport *tgt;
1861         struct bnx2fc_cmd *io_req;
1862         int rc = 0;
1863         int rval;
1864 
1865         rval = fc_remote_port_chkready(rport);
1866         if (rval) {
1867                 sc_cmd->result = rval;
1868                 sc_cmd->scsi_done(sc_cmd);
1869                 return 0;
1870         }
1871 
1872         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1873                 rc = SCSI_MLQUEUE_HOST_BUSY;
1874                 goto exit_qcmd;
1875         }
1876 
1877         /* rport and tgt are allocated together, so tgt should be non-NULL */
1878         tgt = (struct bnx2fc_rport *)&rp[1];
1879 
1880         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1881                 /*
1882                  * Session is not offloaded yet. Let SCSI-ml retry
1883                  * the command.
1884                  */
1885                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1886                 goto exit_qcmd;
1887         }
1888         if (tgt->retry_delay_timestamp) {
1889                 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1890                         tgt->retry_delay_timestamp = 0;
1891                 } else {
1892                         /* If retry_delay timer is active, flow off the ML */
1893                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1894                         goto exit_qcmd;
1895                 }
1896         }
1897 
1898         spin_lock_bh(&tgt->tgt_lock);
1899 
1900         io_req = bnx2fc_cmd_alloc(tgt);
1901         if (!io_req) {
1902                 rc = SCSI_MLQUEUE_HOST_BUSY;
1903                 goto exit_qcmd_tgtlock;
1904         }
1905         io_req->sc_cmd = sc_cmd;
1906 
1907         if (bnx2fc_post_io_req(tgt, io_req)) {
1908                 printk(KERN_ERR PFX "Unable to post io_req\n");
1909                 rc = SCSI_MLQUEUE_HOST_BUSY;
1910                 goto exit_qcmd_tgtlock;
1911         }
1912 
1913 exit_qcmd_tgtlock:
1914         spin_unlock_bh(&tgt->tgt_lock);
1915 exit_qcmd:
1916         return rc;
1917 }
1918 
1919 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1920                                    struct fcoe_task_ctx_entry *task,
1921                                    u8 num_rq)
1922 {
1923         struct fcoe_fcp_rsp_payload *fcp_rsp;
1924         struct bnx2fc_rport *tgt = io_req->tgt;
1925         struct scsi_cmnd *sc_cmd;
1926         u16 scope = 0, qualifier = 0;
1927 
1928         /* scsi_cmd_cmpl is called with tgt lock held */
1929 
1930         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1931                 /* we will not receive ABTS response for this IO */
1932                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1933                            "this scsi cmd\n");
1934                 return;
1935         }
1936 
1937         /* Cancel the timeout_work, as we received IO completion */
1938         if (cancel_delayed_work(&io_req->timeout_work))
1939                 kref_put(&io_req->refcount,
1940                          bnx2fc_cmd_release); /* drop timer hold */
1941 
1942         sc_cmd = io_req->sc_cmd;
1943         if (sc_cmd == NULL) {
1944                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1945                 return;
1946         }
1947 
1948         /* Fetch fcp_rsp from task context and perform cmd completion */
1949         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1950                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1951 
1952         /* parse fcp_rsp and obtain sense data from RQ if available */
1953         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1954 
1955         if (!sc_cmd->SCp.ptr) {
1956                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1957                 return;
1958         }
1959 
1960         if (io_req->on_active_queue) {
1961                 list_del_init(&io_req->link);
1962                 io_req->on_active_queue = 0;
1963                 /* Move IO req to retire queue */
1964                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1965         } else {
1966                 /* This should not happen, but could have been pulled
1967                  * by bnx2fc_flush_active_ios(), or during a race
1968                  * between command abort and (late) completion.
1969                  */
1970                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1971                 if (io_req->wait_for_abts_comp)
1972                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1973                                                &io_req->req_flags))
1974                                 complete(&io_req->abts_done);
1975         }
1976 
1977         bnx2fc_unmap_sg_list(io_req);
1978         io_req->sc_cmd = NULL;
1979 
1980         switch (io_req->fcp_status) {
1981         case FC_GOOD:
1982                 if (io_req->cdb_status == 0) {
1983                         /* Good IO completion */
1984                         sc_cmd->result = DID_OK << 16;
1985                 } else {
1986                         /* Transport status is good, SCSI status not good */
1987                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1988                                  " fcp_resid = 0x%x\n",
1989                                 io_req->cdb_status, io_req->fcp_resid);
1990                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1991 
1992                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1993                             io_req->cdb_status == SAM_STAT_BUSY) {
1994                                 /* Newer array firmware with BUSY or
1995                                  * TASK_SET_FULL may return a status that needs
1996                                  * the scope bits masked.
1997                                  * Or a huge delay timestamp up to 27 minutes
1998                                  * can result.
1999                                  */
2000                                 if (fcp_rsp->retry_delay_timer) {
2001                                         /* Upper 2 bits */
2002                                         scope = fcp_rsp->retry_delay_timer
2003                                                 & 0xC000;
2004                                         /* Lower 14 bits */
2005                                         qualifier = fcp_rsp->retry_delay_timer
2006                                                 & 0x3FFF;
2007                                 }
2008                                 if (scope > 0 && qualifier > 0 &&
2009                                         qualifier <= 0x3FEF) {
2010                                         /* Set the jiffies +
2011                                          * retry_delay_timer * 100ms
2012                                          * for the rport/tgt
2013                                          */
2014                                         tgt->retry_delay_timestamp = jiffies +
2015                                                 (qualifier * HZ / 10);
2016                                 }
2017                         }
2018                 }
2019                 if (io_req->fcp_resid)
2020                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
2021                 break;
2022         default:
2023                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
2024                         io_req->fcp_status);
2025                 break;
2026         }
2027         sc_cmd->SCp.ptr = NULL;
2028         sc_cmd->scsi_done(sc_cmd);
2029         kref_put(&io_req->refcount, bnx2fc_cmd_release);
2030 }
2031 
2032 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
2033                                struct bnx2fc_cmd *io_req)
2034 {
2035         struct fcoe_task_ctx_entry *task;
2036         struct fcoe_task_ctx_entry *task_page;
2037         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2038         struct fcoe_port *port = tgt->port;
2039         struct bnx2fc_interface *interface = port->priv;
2040         struct bnx2fc_hba *hba = interface->hba;
2041         struct fc_lport *lport = port->lport;
2042         struct fc_stats *stats;
2043         int task_idx, index;
2044         u16 xid;
2045 
2046         /* bnx2fc_post_io_req() is called with the tgt_lock held */
2047 
2048         /* Initialize rest of io_req fields */
2049         io_req->cmd_type = BNX2FC_SCSI_CMD;
2050         io_req->port = port;
2051         io_req->tgt = tgt;
2052         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2053         sc_cmd->SCp.ptr = (char *)io_req;
2054 
2055         stats = per_cpu_ptr(lport->stats, get_cpu());
2056         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2057                 io_req->io_req_flags = BNX2FC_READ;
2058                 stats->InputRequests++;
2059                 stats->InputBytes += io_req->data_xfer_len;
2060         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2061                 io_req->io_req_flags = BNX2FC_WRITE;
2062                 stats->OutputRequests++;
2063                 stats->OutputBytes += io_req->data_xfer_len;
2064         } else {
2065                 io_req->io_req_flags = 0;
2066                 stats->ControlRequests++;
2067         }
2068         put_cpu();
2069 
2070         xid = io_req->xid;
2071 
2072         /* Build buffer descriptor list for firmware from sg list */
2073         if (bnx2fc_build_bd_list_from_sg(io_req)) {
2074                 printk(KERN_ERR PFX "BD list creation failed\n");
2075                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2076                 return -EAGAIN;
2077         }
2078 
2079         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2080         index = xid % BNX2FC_TASKS_PER_PAGE;
2081 
2082         /* Initialize task context for this IO request */
2083         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2084         task = &(task_page[index]);
2085         bnx2fc_init_task(io_req, task);
2086 
2087         if (tgt->flush_in_prog) {
2088                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2089                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2090                 return -EAGAIN;
2091         }
2092 
2093         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2094                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2095                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2096                 return -EAGAIN;
2097         }
2098 
2099         /* Time IO req */
2100         if (tgt->io_timeout)
2101                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2102         /* Obtain free SQ entry */
2103         bnx2fc_add_2_sq(tgt, xid);
2104 
2105         /* Enqueue the io_req to active_cmd_queue */
2106 
2107         io_req->on_active_queue = 1;
2108         /* move io_req from pending_queue to active_queue */
2109         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2110 
2111         /* Ring doorbell */
2112         bnx2fc_ring_doorbell(tgt);
2113         return 0;
2114 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/scsi/bnx2fc/bnx2fc_io.c

DEFINITIONS
