LXR linux/drivers/scsi/bnx2fc/bnx2fc

   1/* bnx2fc_io.c: Broadcom NetXtreme II Linux FCoE offload driver.
   2 * IO manager and SCSI IO processing.
   3 *
   4 * Copyright (c) 2008 - 2013 Broadcom Corporation
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation.
   9 *
  10 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  11 */
  12
  13#include "bnx2fc.h"
  14
  15#define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  16
  17static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
  18                           int bd_index);
  19static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
  20static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
  21static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
  22static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
  23static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
  24                                 struct fcoe_fcp_rsp_payload *fcp_rsp,
  25                                 u8 num_rq);
  26
  27void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
  28                          unsigned int timer_msec)
  29{
  30        struct bnx2fc_interface *interface = io_req->port->priv;
  31
  32        if (queue_delayed_work(interface->timer_work_queue,
  33                               &io_req->timeout_work,
  34                               msecs_to_jiffies(timer_msec)))
  35                kref_get(&io_req->refcount);
  36}
  37
  38static void bnx2fc_cmd_timeout(struct work_struct *work)
  39{
  40        struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
  41                                                 timeout_work.work);
  42        struct fc_lport *lport;
  43        struct fc_rport_priv *rdata;
  44        u8 cmd_type = io_req->cmd_type;
  45        struct bnx2fc_rport *tgt = io_req->tgt;
  46        int logo_issued;
  47        int rc;
  48
  49        BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
  50                      "req_flags = %lx\n", cmd_type, io_req->req_flags);
  51
  52        spin_lock_bh(&tgt->tgt_lock);
  53        if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
  54                clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
  55                /*
  56                 * ideally we should hold the io_req until RRQ complets,
  57                 * and release io_req from timeout hold.
  58                 */
  59                spin_unlock_bh(&tgt->tgt_lock);
  60                bnx2fc_send_rrq(io_req);
  61                return;
  62        }
  63        if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
  64                BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
  65                goto done;
  66        }
  67
  68        switch (cmd_type) {
  69        case BNX2FC_SCSI_CMD:
  70                if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
  71                                                        &io_req->req_flags)) {
  72                        /* Handle eh_abort timeout */
  73                        BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
  74                        complete(&io_req->tm_done);
  75                } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
  76                                    &io_req->req_flags)) {
  77                        /* Handle internally generated ABTS timeout */
  78                        BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
  79                                        io_req->refcount.refcount.counter);
  80                        if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
  81                                               &io_req->req_flags))) {
  82
  83                                lport = io_req->port->lport;
  84                                rdata = io_req->tgt->rdata;
  85                                logo_issued = test_and_set_bit(
  86                                                BNX2FC_FLAG_EXPL_LOGO,
  87                                                &tgt->flags);
  88                                kref_put(&io_req->refcount, bnx2fc_cmd_release);
  89                                spin_unlock_bh(&tgt->tgt_lock);
  90
  91                                /* Explicitly logo the target */
  92                                if (!logo_issued) {
  93                                        BNX2FC_IO_DBG(io_req, "Explicit "
  94                                                   "logo - tgt flags = 0x%lx\n",
  95                                                   tgt->flags);
  96
  97                                        mutex_lock(&lport->disc.disc_mutex);
  98                                        lport->tt.rport_logoff(rdata);
  99                                        mutex_unlock(&lport->disc.disc_mutex);
 100                                }
 101                                return;
 102                        }
 103                } else {
 104                        /* Hanlde IO timeout */
 105                        BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
 106                        if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
 107                                             &io_req->req_flags)) {
 108                                BNX2FC_IO_DBG(io_req, "IO completed before "
 109                                                           " timer expiry\n");
 110                                goto done;
 111                        }
 112
 113                        if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
 114                                              &io_req->req_flags)) {
 115                                rc = bnx2fc_initiate_abts(io_req);
 116                                if (rc == SUCCESS)
 117                                        goto done;
 118                                /*
 119                                 * Explicitly logo the target if
 120                                 * abts initiation fails
 121                                 */
 122                                lport = io_req->port->lport;
 123                                rdata = io_req->tgt->rdata;
 124                                logo_issued = test_and_set_bit(
 125                                                BNX2FC_FLAG_EXPL_LOGO,
 126                                                &tgt->flags);
 127                                kref_put(&io_req->refcount, bnx2fc_cmd_release);
 128                                spin_unlock_bh(&tgt->tgt_lock);
 129
 130                                if (!logo_issued) {
 131                                        BNX2FC_IO_DBG(io_req, "Explicit "
 132                                                   "logo - tgt flags = 0x%lx\n",
 133                                                   tgt->flags);
 134
 135
 136                                        mutex_lock(&lport->disc.disc_mutex);
 137                                        lport->tt.rport_logoff(rdata);
 138                                        mutex_unlock(&lport->disc.disc_mutex);
 139                                }
 140                                return;
 141                        } else {
 142                                BNX2FC_IO_DBG(io_req, "IO already in "
 143                                                      "ABTS processing\n");
 144                        }
 145                }
 146                break;
 147        case BNX2FC_ELS:
 148
 149                if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
 150                        BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
 151
 152                        if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
 153                                              &io_req->req_flags)) {
 154                                lport = io_req->port->lport;
 155                                rdata = io_req->tgt->rdata;
 156                                logo_issued = test_and_set_bit(
 157                                                BNX2FC_FLAG_EXPL_LOGO,
 158                                                &tgt->flags);
 159                                kref_put(&io_req->refcount, bnx2fc_cmd_release);
 160                                spin_unlock_bh(&tgt->tgt_lock);
 161
 162                                /* Explicitly logo the target */
 163                                if (!logo_issued) {
 164                                        BNX2FC_IO_DBG(io_req, "Explicitly logo"
 165                                                   "(els)\n");
 166                                        mutex_lock(&lport->disc.disc_mutex);
 167                                        lport->tt.rport_logoff(rdata);
 168                                        mutex_unlock(&lport->disc.disc_mutex);
 169                                }
 170                                return;
 171                        }
 172                } else {
 173                        /*
 174                         * Handle ELS timeout.
 175                         * tgt_lock is used to sync compl path and timeout
 176                         * path. If els compl path is processing this IO, we
 177                         * have nothing to do here, just release the timer hold
 178                         */
 179                        BNX2FC_IO_DBG(io_req, "ELS timed out\n");
 180                        if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
 181                                               &io_req->req_flags))
 182                                goto done;
 183
 184                        /* Indicate the cb_func that this ELS is timed out */
 185                        set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
 186
 187                        if ((io_req->cb_func) && (io_req->cb_arg)) {
 188                                io_req->cb_func(io_req->cb_arg);
 189                                io_req->cb_arg = NULL;
 190                        }
 191                }
 192                break;
 193        default:
 194                printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
 195                        cmd_type);
 196                break;
 197        }
 198
 199done:
 200        /* release the cmd that was held when timer was set */
 201        kref_put(&io_req->refcount, bnx2fc_cmd_release);
 202        spin_unlock_bh(&tgt->tgt_lock);
 203}
 204
 205static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
 206{
 207        /* Called with host lock held */
 208        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 209
 210        /*
 211         * active_cmd_queue may have other command types as well,
 212         * and during flush operation,  we want to error back only
 213         * scsi commands.
 214         */
 215        if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 216                return;
 217
 218        BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
 219        if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
 220                /* Do not call scsi done for this IO */
 221                return;
 222        }
 223
 224        bnx2fc_unmap_sg_list(io_req);
 225        io_req->sc_cmd = NULL;
 226        if (!sc_cmd) {
 227                printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
 228                                    "IO(0x%x) already cleaned up\n",
 229                       io_req->xid);
 230                return;
 231        }
 232        sc_cmd->result = err_code << 16;
 233
 234        BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
 235                sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
 236                sc_cmd->allowed);
 237        scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
 238        sc_cmd->SCp.ptr = NULL;
 239        sc_cmd->scsi_done(sc_cmd);
 240}
 241
 242struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 243{
 244        struct bnx2fc_cmd_mgr *cmgr;
 245        struct io_bdt *bdt_info;
 246        struct bnx2fc_cmd *io_req;
 247        size_t len;
 248        u32 mem_size;
 249        u16 xid;
 250        int i;
 251        int num_ios, num_pri_ios;
 252        size_t bd_tbl_sz;
 253        int arr_sz = num_possible_cpus() + 1;
 254        u16 min_xid = BNX2FC_MIN_XID;
 255        u16 max_xid = hba->max_xid;
 256
 257        if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 258                printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 259                                        and max_xid 0x%x\n", min_xid, max_xid);
 260                return NULL;
 261        }
 262        BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 263
 264        num_ios = max_xid - min_xid + 1;
 265        len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 266        len += sizeof(struct bnx2fc_cmd_mgr);
 267
 268        cmgr = kzalloc(len, GFP_KERNEL);
 269        if (!cmgr) {
 270                printk(KERN_ERR PFX "failed to alloc cmgr\n");
 271                return NULL;
 272        }
 273
 274        cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
 275                                  arr_sz, GFP_KERNEL);
 276        if (!cmgr->free_list) {
 277                printk(KERN_ERR PFX "failed to alloc free_list\n");
 278                goto mem_err;
 279        }
 280
 281        cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
 282                                       arr_sz, GFP_KERNEL);
 283        if (!cmgr->free_list_lock) {
 284                printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 285                goto mem_err;
 286        }
 287
 288        cmgr->hba = hba;
 289        cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 290
 291        for (i = 0; i < arr_sz; i++)  {
 292                INIT_LIST_HEAD(&cmgr->free_list[i]);
 293                spin_lock_init(&cmgr->free_list_lock[i]);
 294        }
 295
 296        /*
 297         * Pre-allocated pool of bnx2fc_cmds.
 298         * Last entry in the free list array is the free list
 299         * of slow path requests.
 300         */
 301        xid = BNX2FC_MIN_XID;
 302        num_pri_ios = num_ios - hba->elstm_xids;
 303        for (i = 0; i < num_ios; i++) {
 304                io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 305
 306                if (!io_req) {
 307                        printk(KERN_ERR PFX "failed to alloc io_req\n");
 308                        goto mem_err;
 309                }
 310
 311                INIT_LIST_HEAD(&io_req->link);
 312                INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 313
 314                io_req->xid = xid++;
 315                if (i < num_pri_ios)
 316                        list_add_tail(&io_req->link,
 317                                &cmgr->free_list[io_req->xid %
 318                                                 num_possible_cpus()]);
 319                else
 320                        list_add_tail(&io_req->link,
 321                                &cmgr->free_list[num_possible_cpus()]);
 322                io_req++;
 323        }
 324
 325        /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 326        mem_size = num_ios * sizeof(struct io_bdt *);
 327        cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
 328        if (!cmgr->io_bdt_pool) {
 329                printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 330                goto mem_err;
 331        }
 332
 333        mem_size = sizeof(struct io_bdt);
 334        for (i = 0; i < num_ios; i++) {
 335                cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 336                if (!cmgr->io_bdt_pool[i]) {
 337                        printk(KERN_ERR PFX "failed to alloc "
 338                                "io_bdt_pool[%d]\n", i);
 339                        goto mem_err;
 340                }
 341        }
 342
 343        /* Allocate an map fcoe_bdt_ctx structures */
 344        bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 345        for (i = 0; i < num_ios; i++) {
 346                bdt_info = cmgr->io_bdt_pool[i];
 347                bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 348                                                      bd_tbl_sz,
 349                                                      &bdt_info->bd_tbl_dma,
 350                                                      GFP_KERNEL);
 351                if (!bdt_info->bd_tbl) {
 352                        printk(KERN_ERR PFX "failed to alloc "
 353                                "bdt_tbl[%d]\n", i);
 354                        goto mem_err;
 355                }
 356        }
 357
 358        return cmgr;
 359
 360mem_err:
 361        bnx2fc_cmd_mgr_free(cmgr);
 362        return NULL;
 363}
 364
 365void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 366{
 367        struct io_bdt *bdt_info;
 368        struct bnx2fc_hba *hba = cmgr->hba;
 369        size_t bd_tbl_sz;
 370        u16 min_xid = BNX2FC_MIN_XID;
 371        u16 max_xid = hba->max_xid;
 372        int num_ios;
 373        int i;
 374
 375        num_ios = max_xid - min_xid + 1;
 376
 377        /* Free fcoe_bdt_ctx structures */
 378        if (!cmgr->io_bdt_pool)
 379                goto free_cmd_pool;
 380
 381        bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 382        for (i = 0; i < num_ios; i++) {
 383                bdt_info = cmgr->io_bdt_pool[i];
 384                if (bdt_info->bd_tbl) {
 385                        dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 386                                            bdt_info->bd_tbl,
 387                                            bdt_info->bd_tbl_dma);
 388                        bdt_info->bd_tbl = NULL;
 389                }
 390        }
 391
 392        /* Destroy io_bdt pool */
 393        for (i = 0; i < num_ios; i++) {
 394                kfree(cmgr->io_bdt_pool[i]);
 395                cmgr->io_bdt_pool[i] = NULL;
 396        }
 397
 398        kfree(cmgr->io_bdt_pool);
 399        cmgr->io_bdt_pool = NULL;
 400
 401free_cmd_pool:
 402        kfree(cmgr->free_list_lock);
 403
 404        /* Destroy cmd pool */
 405        if (!cmgr->free_list)
 406                goto free_cmgr;
 407
 408        for (i = 0; i < num_possible_cpus() + 1; i++)  {
 409                struct bnx2fc_cmd *tmp, *io_req;
 410
 411                list_for_each_entry_safe(io_req, tmp,
 412                                         &cmgr->free_list[i], link) {
 413                        list_del(&io_req->link);
 414                        kfree(io_req);
 415                }
 416        }
 417        kfree(cmgr->free_list);
 418free_cmgr:
 419        /* Free command manager itself */
 420        kfree(cmgr);
 421}
 422
 423struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
 424{
 425        struct fcoe_port *port = tgt->port;
 426        struct bnx2fc_interface *interface = port->priv;
 427        struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 428        struct bnx2fc_cmd *io_req;
 429        struct list_head *listp;
 430        struct io_bdt *bd_tbl;
 431        int index = RESERVE_FREE_LIST_INDEX;
 432        u32 free_sqes;
 433        u32 max_sqes;
 434        u16 xid;
 435
 436        max_sqes = tgt->max_sqes;
 437        switch (type) {
 438        case BNX2FC_TASK_MGMT_CMD:
 439                max_sqes = BNX2FC_TM_MAX_SQES;
 440                break;
 441        case BNX2FC_ELS:
 442                max_sqes = BNX2FC_ELS_MAX_SQES;
 443                break;
 444        default:
 445                break;
 446        }
 447
 448        /*
 449         * NOTE: Free list insertions and deletions are protected with
 450         * cmgr lock
 451         */
 452        spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 453        free_sqes = atomic_read(&tgt->free_sqes);
 454        if ((list_empty(&(cmd_mgr->free_list[index]))) ||
 455            (tgt->num_active_ios.counter  >= max_sqes) ||
 456            (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 457                BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
 458                        "ios(%d):sqes(%d)\n",
 459                        tgt->num_active_ios.counter, tgt->max_sqes);
 460                if (list_empty(&(cmd_mgr->free_list[index])))
 461                        printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
 462                spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 463                return NULL;
 464        }
 465
 466        listp = (struct list_head *)
 467                        cmd_mgr->free_list[index].next;
 468        list_del_init(listp);
 469        io_req = (struct bnx2fc_cmd *) listp;
 470        xid = io_req->xid;
 471        cmd_mgr->cmds[xid] = io_req;
 472        atomic_inc(&tgt->num_active_ios);
 473        atomic_dec(&tgt->free_sqes);
 474        spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 475
 476        INIT_LIST_HEAD(&io_req->link);
 477
 478        io_req->port = port;
 479        io_req->cmd_mgr = cmd_mgr;
 480        io_req->req_flags = 0;
 481        io_req->cmd_type = type;
 482
 483        /* Bind io_bdt for this io_req */
 484        /* Have a static link between io_req and io_bdt_pool */
 485        bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 486        bd_tbl->io_req = io_req;
 487
 488        /* Hold the io_req  against deletion */
 489        kref_init(&io_req->refcount);
 490        return io_req;
 491}
 492
 493struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
 494{
 495        struct fcoe_port *port = tgt->port;
 496        struct bnx2fc_interface *interface = port->priv;
 497        struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
 498        struct bnx2fc_cmd *io_req;
 499        struct list_head *listp;
 500        struct io_bdt *bd_tbl;
 501        u32 free_sqes;
 502        u32 max_sqes;
 503        u16 xid;
 504        int index = get_cpu();
 505
 506        max_sqes = BNX2FC_SCSI_MAX_SQES;
 507        /*
 508         * NOTE: Free list insertions and deletions are protected with
 509         * cmgr lock
 510         */
 511        spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 512        free_sqes = atomic_read(&tgt->free_sqes);
 513        if ((list_empty(&cmd_mgr->free_list[index])) ||
 514            (tgt->num_active_ios.counter  >= max_sqes) ||
 515            (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
 516                spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 517                put_cpu();
 518                return NULL;
 519        }
 520
 521        listp = (struct list_head *)
 522                cmd_mgr->free_list[index].next;
 523        list_del_init(listp);
 524        io_req = (struct bnx2fc_cmd *) listp;
 525        xid = io_req->xid;
 526        cmd_mgr->cmds[xid] = io_req;
 527        atomic_inc(&tgt->num_active_ios);
 528        atomic_dec(&tgt->free_sqes);
 529        spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 530        put_cpu();
 531
 532        INIT_LIST_HEAD(&io_req->link);
 533
 534        io_req->port = port;
 535        io_req->cmd_mgr = cmd_mgr;
 536        io_req->req_flags = 0;
 537
 538        /* Bind io_bdt for this io_req */
 539        /* Have a static link between io_req and io_bdt_pool */
 540        bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 541        bd_tbl->io_req = io_req;
 542
 543        /* Hold the io_req  against deletion */
 544        kref_init(&io_req->refcount);
 545        return io_req;
 546}
 547
 548void bnx2fc_cmd_release(struct kref *ref)
 549{
 550        struct bnx2fc_cmd *io_req = container_of(ref,
 551                                                struct bnx2fc_cmd, refcount);
 552        struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 553        int index;
 554
 555        if (io_req->cmd_type == BNX2FC_SCSI_CMD)
 556                index = io_req->xid % num_possible_cpus();
 557        else
 558                index = RESERVE_FREE_LIST_INDEX;
 559
 560
 561        spin_lock_bh(&cmd_mgr->free_list_lock[index]);
 562        if (io_req->cmd_type != BNX2FC_SCSI_CMD)
 563                bnx2fc_free_mp_resc(io_req);
 564        cmd_mgr->cmds[io_req->xid] = NULL;
 565        /* Delete IO from retire queue */
 566        list_del_init(&io_req->link);
 567        /* Add it to the free list */
 568        list_add(&io_req->link,
 569                        &cmd_mgr->free_list[index]);
 570        atomic_dec(&io_req->tgt->num_active_ios);
 571        spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
 572
 573}
 574
 575static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
 576{
 577        struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
 578        struct bnx2fc_interface *interface = io_req->port->priv;
 579        struct bnx2fc_hba *hba = interface->hba;
 580        size_t sz = sizeof(struct fcoe_bd_ctx);
 581
 582        /* clear tm flags */
 583        mp_req->tm_flags = 0;
 584        if (mp_req->mp_req_bd) {
 585                dma_free_coherent(&hba->pcidev->dev, sz,
 586                                     mp_req->mp_req_bd,
 587                                     mp_req->mp_req_bd_dma);
 588                mp_req->mp_req_bd = NULL;
 589        }
 590        if (mp_req->mp_resp_bd) {
 591                dma_free_coherent(&hba->pcidev->dev, sz,
 592                                     mp_req->mp_resp_bd,
 593                                     mp_req->mp_resp_bd_dma);
 594                mp_req->mp_resp_bd = NULL;
 595        }
 596        if (mp_req->req_buf) {
 597                dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 598                                     mp_req->req_buf,
 599                                     mp_req->req_buf_dma);
 600                mp_req->req_buf = NULL;
 601        }
 602        if (mp_req->resp_buf) {
 603                dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
 604                                     mp_req->resp_buf,
 605                                     mp_req->resp_buf_dma);
 606                mp_req->resp_buf = NULL;
 607        }
 608}
 609
 610int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
 611{
 612        struct bnx2fc_mp_req *mp_req;
 613        struct fcoe_bd_ctx *mp_req_bd;
 614        struct fcoe_bd_ctx *mp_resp_bd;
 615        struct bnx2fc_interface *interface = io_req->port->priv;
 616        struct bnx2fc_hba *hba = interface->hba;
 617        dma_addr_t addr;
 618        size_t sz;
 619
 620        mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 621        memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
 622
 623        mp_req->req_len = sizeof(struct fcp_cmnd);
 624        io_req->data_xfer_len = mp_req->req_len;
 625        mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 626                                             &mp_req->req_buf_dma,
 627                                             GFP_ATOMIC);
 628        if (!mp_req->req_buf) {
 629                printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
 630                bnx2fc_free_mp_resc(io_req);
 631                return FAILED;
 632        }
 633
 634        mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
 635                                              &mp_req->resp_buf_dma,
 636                                              GFP_ATOMIC);
 637        if (!mp_req->resp_buf) {
 638                printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
 639                bnx2fc_free_mp_resc(io_req);
 640                return FAILED;
 641        }
 642        memset(mp_req->req_buf, 0, PAGE_SIZE);
 643        memset(mp_req->resp_buf, 0, PAGE_SIZE);
 644
 645        /* Allocate and map mp_req_bd and mp_resp_bd */
 646        sz = sizeof(struct fcoe_bd_ctx);
 647        mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 648                                                 &mp_req->mp_req_bd_dma,
 649                                                 GFP_ATOMIC);
 650        if (!mp_req->mp_req_bd) {
 651                printk(KERN_ERR PFX "unable to alloc MP req bd\n");
 652                bnx2fc_free_mp_resc(io_req);
 653                return FAILED;
 654        }
 655        mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
 656                                                 &mp_req->mp_resp_bd_dma,
 657                                                 GFP_ATOMIC);
 658        if (!mp_req->mp_resp_bd) {
 659                printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 660                bnx2fc_free_mp_resc(io_req);
 661                return FAILED;
 662        }
 663        /* Fill bd table */
 664        addr = mp_req->req_buf_dma;
 665        mp_req_bd = mp_req->mp_req_bd;
 666        mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 667        mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 668        mp_req_bd->buf_len = PAGE_SIZE;
 669        mp_req_bd->flags = 0;
 670
 671        /*
 672         * MP buffer is either a task mgmt command or an ELS.
 673         * So the assumption is that it consumes a single bd
 674         * entry in the bd table
 675         */
 676        mp_resp_bd = mp_req->mp_resp_bd;
 677        addr = mp_req->resp_buf_dma;
 678        mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 679        mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 680        mp_resp_bd->buf_len = PAGE_SIZE;
 681        mp_resp_bd->flags = 0;
 682
 683        return SUCCESS;
 684}
 685
 686static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 687{
 688        struct fc_lport *lport;
 689        struct fc_rport *rport;
 690        struct fc_rport_libfc_priv *rp;
 691        struct fcoe_port *port;
 692        struct bnx2fc_interface *interface;
 693        struct bnx2fc_rport *tgt;
 694        struct bnx2fc_cmd *io_req;
 695        struct bnx2fc_mp_req *tm_req;
 696        struct fcoe_task_ctx_entry *task;
 697        struct fcoe_task_ctx_entry *task_page;
 698        struct Scsi_Host *host = sc_cmd->device->host;
 699        struct fc_frame_header *fc_hdr;
 700        struct fcp_cmnd *fcp_cmnd;
 701        int task_idx, index;
 702        int rc = SUCCESS;
 703        u16 xid;
 704        u32 sid, did;
 705        unsigned long start = jiffies;
 706
 707        lport = shost_priv(host);
 708        rport = starget_to_rport(scsi_target(sc_cmd->device));
 709        port = lport_priv(lport);
 710        interface = port->priv;
 711
 712        if (rport == NULL) {
 713                printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 714                rc = FAILED;
 715                goto tmf_err;
 716        }
 717        rp = rport->dd_data;
 718
 719        rc = fc_block_scsi_eh(sc_cmd);
 720        if (rc)
 721                return rc;
 722
 723        if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 724                printk(KERN_ERR PFX "device_reset: link is not ready\n");
 725                rc = FAILED;
 726                goto tmf_err;
 727        }
 728        /* rport and tgt are allocated together, so tgt should be non-NULL */
 729        tgt = (struct bnx2fc_rport *)&rp[1];
 730
 731        if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 732                printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 733                rc = FAILED;
 734                goto tmf_err;
 735        }
 736retry_tmf:
 737        io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 738        if (!io_req) {
 739                if (time_after(jiffies, start + HZ)) {
 740                        printk(KERN_ERR PFX "tmf: Failed TMF");
 741                        rc = FAILED;
 742                        goto tmf_err;
 743                }
 744                msleep(20);
 745                goto retry_tmf;
 746        }
 747        /* Initialize rest of io_req fields */
 748        io_req->sc_cmd = sc_cmd;
 749        io_req->port = port;
 750        io_req->tgt = tgt;
 751
 752        tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 753
 754        rc = bnx2fc_init_mp_req(io_req);
 755        if (rc == FAILED) {
 756                printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 757                spin_lock_bh(&tgt->tgt_lock);
 758                kref_put(&io_req->refcount, bnx2fc_cmd_release);
 759                spin_unlock_bh(&tgt->tgt_lock);
 760                goto tmf_err;
 761        }
 762
 763        /* Set TM flags */
 764        io_req->io_req_flags = 0;
 765        tm_req->tm_flags = tm_flags;
 766
 767        /* Fill FCP_CMND */
 768        bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 769        fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 770        memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 771        fcp_cmnd->fc_dl = 0;
 772
 773        /* Fill FC header */
 774        fc_hdr = &(tm_req->req_fc_hdr);
 775        sid = tgt->sid;
 776        did = rport->port_id;
 777        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 778                           FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 779                           FC_FC_SEQ_INIT, 0);
 780        /* Obtain exchange id */
 781        xid = io_req->xid;
 782
 783        BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 784        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 785        index = xid % BNX2FC_TASKS_PER_PAGE;
 786
 787        /* Initialize task context for this IO request */
 788        task_page = (struct fcoe_task_ctx_entry *)
 789                        interface->hba->task_ctx[task_idx];
 790        task = &(task_page[index]);
 791        bnx2fc_init_mp_task(io_req, task);
 792
 793        sc_cmd->SCp.ptr = (char *)io_req;
 794
 795        /* Obtain free SQ entry */
 796        spin_lock_bh(&tgt->tgt_lock);
 797        bnx2fc_add_2_sq(tgt, xid);
 798
 799        /* Enqueue the io_req to active_tm_queue */
 800        io_req->on_tmf_queue = 1;
 801        list_add_tail(&io_req->link, &tgt->active_tm_queue);
 802
 803        init_completion(&io_req->tm_done);
 804        io_req->wait_for_comp = 1;
 805
 806        /* Ring doorbell */
 807        bnx2fc_ring_doorbell(tgt);
 808        spin_unlock_bh(&tgt->tgt_lock);
 809
 810        rc = wait_for_completion_timeout(&io_req->tm_done,
 811                                         BNX2FC_TM_TIMEOUT * HZ);
 812        spin_lock_bh(&tgt->tgt_lock);
 813
 814        io_req->wait_for_comp = 0;
 815        if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
 816                set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 817                if (io_req->on_tmf_queue) {
 818                        list_del_init(&io_req->link);
 819                        io_req->on_tmf_queue = 0;
 820                }
 821                io_req->wait_for_comp = 1;
 822                bnx2fc_initiate_cleanup(io_req);
 823                spin_unlock_bh(&tgt->tgt_lock);
 824                rc = wait_for_completion_timeout(&io_req->tm_done,
 825                                                 BNX2FC_FW_TIMEOUT);
 826                spin_lock_bh(&tgt->tgt_lock);
 827                io_req->wait_for_comp = 0;
 828                if (!rc)
 829                        kref_put(&io_req->refcount, bnx2fc_cmd_release);
 830        }
 831
 832        spin_unlock_bh(&tgt->tgt_lock);
 833
 834        if (!rc) {
 835                BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 836                rc = FAILED;
 837        } else {
 838                BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 839                rc = SUCCESS;
 840        }
 841tmf_err:
 842        return rc;
 843}
 844
 845int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 846{
 847        struct fc_lport *lport;
 848        struct bnx2fc_rport *tgt = io_req->tgt;
 849        struct fc_rport *rport = tgt->rport;
 850        struct fc_rport_priv *rdata = tgt->rdata;
 851        struct bnx2fc_interface *interface;
 852        struct fcoe_port *port;
 853        struct bnx2fc_cmd *abts_io_req;
 854        struct fcoe_task_ctx_entry *task;
 855        struct fcoe_task_ctx_entry *task_page;
 856        struct fc_frame_header *fc_hdr;
 857        struct bnx2fc_mp_req *abts_req;
 858        int task_idx, index;
 859        u32 sid, did;
 860        u16 xid;
 861        int rc = SUCCESS;
 862        u32 r_a_tov = rdata->r_a_tov;
 863
 864        /* called with tgt_lock held */
 865        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 866
 867        port = io_req->port;
 868        interface = port->priv;
 869        lport = port->lport;
 870
 871        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 872                printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 873                rc = FAILED;
 874                goto abts_err;
 875        }
 876
 877        if (rport == NULL) {
 878                printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 879                rc = FAILED;
 880                goto abts_err;
 881        }
 882
 883        if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 884                printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 885                rc = FAILED;
 886                goto abts_err;
 887        }
 888
 889        abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 890        if (!abts_io_req) {
 891                printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 892                rc = FAILED;
 893                goto abts_err;
 894        }
 895
 896        /* Initialize rest of io_req fields */
 897        abts_io_req->sc_cmd = NULL;
 898        abts_io_req->port = port;
 899        abts_io_req->tgt = tgt;
 900        abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 901
 902        abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 903        memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 904
 905        /* Fill FC header */
 906        fc_hdr = &(abts_req->req_fc_hdr);
 907
 908        /* Obtain oxid and rxid for the original exchange to be aborted */
 909        fc_hdr->fh_ox_id = htons(io_req->xid);
 910        fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 911
 912        sid = tgt->sid;
 913        did = rport->port_id;
 914
 915        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 916                           FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 917                           FC_FC_SEQ_INIT, 0);
 918
 919        xid = abts_io_req->xid;
 920        BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 921        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 922        index = xid % BNX2FC_TASKS_PER_PAGE;
 923
 924        /* Initialize task context for this IO request */
 925        task_page = (struct fcoe_task_ctx_entry *)
 926                        interface->hba->task_ctx[task_idx];
 927        task = &(task_page[index]);
 928        bnx2fc_init_mp_task(abts_io_req, task);
 929
 930        /*
 931         * ABTS task is a temporary task that will be cleaned up
 932         * irrespective of ABTS response. We need to start the timer
 933         * for the original exchange, as the CQE is posted for the original
 934         * IO request.
 935         *
 936         * Timer for ABTS is started only when it is originated by a
 937         * TM request. For the ABTS issued as part of ULP timeout,
 938         * scsi-ml maintains the timers.
 939         */
 940
 941        /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 942        bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 943
 944        /* Obtain free SQ entry */
 945        bnx2fc_add_2_sq(tgt, xid);
 946
 947        /* Ring doorbell */
 948        bnx2fc_ring_doorbell(tgt);
 949
 950abts_err:
 951        return rc;
 952}
 953
 954int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 955                                enum fc_rctl r_ctl)
 956{
 957        struct fc_lport *lport;
 958        struct bnx2fc_rport *tgt = orig_io_req->tgt;
 959        struct bnx2fc_interface *interface;
 960        struct fcoe_port *port;
 961        struct bnx2fc_cmd *seq_clnp_req;
 962        struct fcoe_task_ctx_entry *task;
 963        struct fcoe_task_ctx_entry *task_page;
 964        struct bnx2fc_els_cb_arg *cb_arg = NULL;
 965        int task_idx, index;
 966        u16 xid;
 967        int rc = 0;
 968
 969        BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 970                   orig_io_req->xid);
 971        kref_get(&orig_io_req->refcount);
 972
 973        port = orig_io_req->port;
 974        interface = port->priv;
 975        lport = port->lport;
 976
 977        cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 978        if (!cb_arg) {
 979                printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 980                rc = -ENOMEM;
 981                goto cleanup_err;
 982        }
 983
 984        seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 985        if (!seq_clnp_req) {
 986                printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 987                rc = -ENOMEM;
 988                kfree(cb_arg);
 989                goto cleanup_err;
 990        }
 991        /* Initialize rest of io_req fields */
 992        seq_clnp_req->sc_cmd = NULL;
 993        seq_clnp_req->port = port;
 994        seq_clnp_req->tgt = tgt;
 995        seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 996
 997        xid = seq_clnp_req->xid;
 998
 999        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1000        index = xid % BNX2FC_TASKS_PER_PAGE;

1001
1002        /* Initialize task context for this IO request */
1003        task_page = (struct fcoe_task_ctx_entry *)
1004                     interface->hba->task_ctx[task_idx];
1005        task = &(task_page[index]);
1006        cb_arg->aborted_io_req = orig_io_req;
1007        cb_arg->io_req = seq_clnp_req;
1008        cb_arg->r_ctl = r_ctl;
1009        cb_arg->offset = offset;
1010        seq_clnp_req->cb_arg = cb_arg;
1011
1012        printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
1013        bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
1014
1015        /* Obtain free SQ entry */
1016        bnx2fc_add_2_sq(tgt, xid);
1017
1018        /* Ring doorbell */
1019        bnx2fc_ring_doorbell(tgt);
1020cleanup_err:
1021        return rc;
1022}
1023
1024int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1025{
1026        struct fc_lport *lport;
1027        struct bnx2fc_rport *tgt = io_req->tgt;
1028        struct bnx2fc_interface *interface;
1029        struct fcoe_port *port;
1030        struct bnx2fc_cmd *cleanup_io_req;
1031        struct fcoe_task_ctx_entry *task;
1032        struct fcoe_task_ctx_entry *task_page;
1033        int task_idx, index;
1034        u16 xid, orig_xid;
1035        int rc = 0;
1036
1037        /* ASSUMPTION: called with tgt_lock held */
1038        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1039
1040        port = io_req->port;
1041        interface = port->priv;
1042        lport = port->lport;
1043
1044        cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1045        if (!cleanup_io_req) {
1046                printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1047                rc = -1;
1048                goto cleanup_err;
1049        }
1050
1051        /* Initialize rest of io_req fields */
1052        cleanup_io_req->sc_cmd = NULL;
1053        cleanup_io_req->port = port;
1054        cleanup_io_req->tgt = tgt;
1055        cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1056
1057        xid = cleanup_io_req->xid;
1058
1059        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1060        index = xid % BNX2FC_TASKS_PER_PAGE;
1061
1062        /* Initialize task context for this IO request */
1063        task_page = (struct fcoe_task_ctx_entry *)
1064                        interface->hba->task_ctx[task_idx];
1065        task = &(task_page[index]);
1066        orig_xid = io_req->xid;
1067
1068        BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1069
1070        bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1071
1072        /* Obtain free SQ entry */
1073        bnx2fc_add_2_sq(tgt, xid);
1074
1075        /* Ring doorbell */
1076        bnx2fc_ring_doorbell(tgt);
1077
1078cleanup_err:
1079        return rc;
1080}
1081
1082/**
1083 * bnx2fc_eh_target_reset: Reset a target
1084 *
1085 * @sc_cmd:     SCSI command
1086 *
1087 * Set from SCSI host template to send task mgmt command to the target
1088 *      and wait for the response
1089 */
1090int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1091{
1092        return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1093}
1094
1095/**
1096 * bnx2fc_eh_device_reset - Reset a single LUN
1097 *
1098 * @sc_cmd:     SCSI command
1099 *
1100 * Set from SCSI host template to send task mgmt command to the target
1101 *      and wait for the response
1102 */
1103int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1104{
1105        return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1106}
1107
1108int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
1109{
1110        struct bnx2fc_rport *tgt = io_req->tgt;
1111        struct fc_rport_priv *rdata = tgt->rdata;
1112        int logo_issued;
1113        int rc = SUCCESS;
1114        int wait_cnt = 0;
1115
1116        BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1117                      tgt->flags);
1118        logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1119                                       &tgt->flags);
1120        io_req->wait_for_comp = 1;
1121        bnx2fc_initiate_cleanup(io_req);
1122
1123        spin_unlock_bh(&tgt->tgt_lock);
1124
1125        wait_for_completion(&io_req->tm_done);
1126
1127        io_req->wait_for_comp = 0;
1128        /*
1129         * release the reference taken in eh_abort to allow the
1130         * target to re-login after flushing IOs
1131         */
1132         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1133
1134        if (!logo_issued) {
1135                clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
1136                mutex_lock(&lport->disc.disc_mutex);
1137                lport->tt.rport_logoff(rdata);
1138                mutex_unlock(&lport->disc.disc_mutex);
1139                do {
1140                        msleep(BNX2FC_RELOGIN_WAIT_TIME);
1141                        if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
1142                                rc = FAILED;
1143                                break;
1144                        }
1145                } while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
1146        }
1147        spin_lock_bh(&tgt->tgt_lock);
1148        return rc;
1149}
1150/**
1151 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1152 *                      SCSI command
1153 *
1154 * @sc_cmd:     SCSI_ML command pointer
1155 *
1156 * SCSI abort request handler
1157 */
1158int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1159{
1160        struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1161        struct fc_rport_libfc_priv *rp = rport->dd_data;
1162        struct bnx2fc_cmd *io_req;
1163        struct fc_lport *lport;
1164        struct bnx2fc_rport *tgt;
1165        int rc = FAILED;
1166
1167
1168        rc = fc_block_scsi_eh(sc_cmd);
1169        if (rc)
1170                return rc;
1171
1172        lport = shost_priv(sc_cmd->device->host);
1173        if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1174                printk(KERN_ERR PFX "eh_abort: link not ready\n");
1175                return rc;
1176        }
1177
1178        tgt = (struct bnx2fc_rport *)&rp[1];
1179
1180        BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1181
1182        spin_lock_bh(&tgt->tgt_lock);
1183        io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1184        if (!io_req) {
1185                /* Command might have just completed */
1186                printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1187                spin_unlock_bh(&tgt->tgt_lock);
1188                return SUCCESS;
1189        }
1190        BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1191                      io_req->refcount.refcount.counter);
1192
1193        /* Hold IO request across abort processing */
1194        kref_get(&io_req->refcount);
1195
1196        BUG_ON(tgt != io_req->tgt);
1197
1198        /* Remove the io_req from the active_q. */
1199        /*
1200         * Task Mgmt functions (LUN RESET & TGT RESET) will not
1201         * issue an ABTS on this particular IO req, as the
1202         * io_req is no longer in the active_q.
1203         */
1204        if (tgt->flush_in_prog) {
1205                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1206                        "flush in progress\n", io_req->xid);
1207                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1208                spin_unlock_bh(&tgt->tgt_lock);
1209                return SUCCESS;
1210        }
1211
1212        if (io_req->on_active_queue == 0) {
1213                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1214                                "not on active_q\n", io_req->xid);
1215                /*
1216                 * This condition can happen only due to the FW bug,
1217                 * where we do not receive cleanup response from
1218                 * the FW. Handle this case gracefully by erroring
1219                 * back the IO request to SCSI-ml
1220                 */
1221                bnx2fc_scsi_done(io_req, DID_ABORT);
1222
1223                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1224                spin_unlock_bh(&tgt->tgt_lock);
1225                return SUCCESS;
1226        }
1227
1228        /*
1229         * Only eh_abort processing will remove the IO from
1230         * active_cmd_q before processing the request. this is
1231         * done to avoid race conditions between IOs aborted
1232         * as part of task management completion and eh_abort
1233         * processing
1234         */
1235        list_del_init(&io_req->link);
1236        io_req->on_active_queue = 0;
1237        /* Move IO req to retire queue */
1238        list_add_tail(&io_req->link, &tgt->io_retire_queue);
1239
1240        init_completion(&io_req->tm_done);
1241
1242        if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1243                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1244                                "already in abts processing\n", io_req->xid);
1245                if (cancel_delayed_work(&io_req->timeout_work))
1246                        kref_put(&io_req->refcount,
1247                                 bnx2fc_cmd_release); /* drop timer hold */
1248                rc = bnx2fc_expl_logo(lport, io_req);
1249                goto out;
1250        }
1251
1252        /* Cancel the current timer running on this io_req */
1253        if (cancel_delayed_work(&io_req->timeout_work))
1254                kref_put(&io_req->refcount,
1255                         bnx2fc_cmd_release); /* drop timer hold */
1256        set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1257        io_req->wait_for_comp = 1;
1258        rc = bnx2fc_initiate_abts(io_req);
1259        if (rc == FAILED) {
1260                bnx2fc_initiate_cleanup(io_req);
1261                spin_unlock_bh(&tgt->tgt_lock);
1262                wait_for_completion(&io_req->tm_done);
1263                spin_lock_bh(&tgt->tgt_lock);
1264                io_req->wait_for_comp = 0;
1265                goto done;
1266        }
1267        spin_unlock_bh(&tgt->tgt_lock);
1268
1269        wait_for_completion(&io_req->tm_done);
1270
1271        spin_lock_bh(&tgt->tgt_lock);
1272        io_req->wait_for_comp = 0;
1273        if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1274                BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1275                rc = SUCCESS;
1276        } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1277                                      &io_req->req_flags))) {
1278                /* Let the scsi-ml try to recover this command */
1279                printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1280                       io_req->xid);
1281                rc = bnx2fc_expl_logo(lport, io_req);
1282                goto out;
1283        } else {
1284                /*
1285                 * We come here even when there was a race condition
1286                 * between timeout and abts completion, and abts
1287                 * completion happens just in time.
1288                 */
1289                BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1290                rc = SUCCESS;
1291                bnx2fc_scsi_done(io_req, DID_ABORT);
1292                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1293        }
1294done:
1295        /* release the reference taken in eh_abort */
1296        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1297out:
1298        spin_unlock_bh(&tgt->tgt_lock);
1299        return rc;
1300}
1301
1302void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1303                                      struct fcoe_task_ctx_entry *task,
1304                                      u8 rx_state)
1305{
1306        struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1307        struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1308        u32 offset = cb_arg->offset;
1309        enum fc_rctl r_ctl = cb_arg->r_ctl;
1310        int rc = 0;
1311        struct bnx2fc_rport *tgt = orig_io_req->tgt;
1312
1313        BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1314                              "cmd_type = %d\n",
1315                   seq_clnp_req->xid, seq_clnp_req->cmd_type);
1316
1317        if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1318                printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1319                        seq_clnp_req->xid);
1320                goto free_cb_arg;
1321        }
1322
1323        spin_unlock_bh(&tgt->tgt_lock);
1324        rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1325        spin_lock_bh(&tgt->tgt_lock);
1326
1327        if (rc)
1328                printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1329                        " IO will abort\n");
1330        seq_clnp_req->cb_arg = NULL;
1331        kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1332free_cb_arg:
1333        kfree(cb_arg);
1334        return;
1335}
1336
1337void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1338                                  struct fcoe_task_ctx_entry *task,
1339                                  u8 num_rq)
1340{
1341        BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1342                              "refcnt = %d, cmd_type = %d\n",
1343                   io_req->refcount.refcount.counter, io_req->cmd_type);
1344        bnx2fc_scsi_done(io_req, DID_ERROR);
1345        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1346        if (io_req->wait_for_comp)
1347                complete(&io_req->tm_done);
1348}
1349
1350void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1351                               struct fcoe_task_ctx_entry *task,
1352                               u8 num_rq)
1353{
1354        u32 r_ctl;
1355        u32 r_a_tov = FC_DEF_R_A_TOV;
1356        u8 issue_rrq = 0;
1357        struct bnx2fc_rport *tgt = io_req->tgt;
1358
1359        BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1360                              "refcnt = %d, cmd_type = %d\n",
1361                   io_req->xid,
1362                   io_req->refcount.refcount.counter, io_req->cmd_type);
1363
1364        if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1365                                       &io_req->req_flags)) {
1366                BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1367                                " this io\n");
1368                return;
1369        }
1370
1371        /* Do not issue RRQ as this IO is already cleanedup */
1372        if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1373                                &io_req->req_flags))
1374                goto io_compl;
1375
1376        /*
1377         * For ABTS issued due to SCSI eh_abort_handler, timeout
1378         * values are maintained by scsi-ml itself. Cancel timeout
1379         * in case ABTS issued as part of task management function
1380         * or due to FW error.
1381         */
1382        if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1383                if (cancel_delayed_work(&io_req->timeout_work))
1384                        kref_put(&io_req->refcount,
1385                                 bnx2fc_cmd_release); /* drop timer hold */
1386
1387        r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1388
1389        switch (r_ctl) {
1390        case FC_RCTL_BA_ACC:
1391                /*
1392                 * Dont release this cmd yet. It will be relesed
1393                 * after we get RRQ response
1394                 */
1395                BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1396                issue_rrq = 1;
1397                break;
1398
1399        case FC_RCTL_BA_RJT:
1400                BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1401                break;
1402        default:
1403                printk(KERN_ERR PFX "Unknown ABTS response\n");
1404                break;
1405        }
1406
1407        if (issue_rrq) {
1408                BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1409                set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1410        }
1411        set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1412        bnx2fc_cmd_timer_set(io_req, r_a_tov);
1413
1414io_compl:
1415        if (io_req->wait_for_comp) {
1416                if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1417                                       &io_req->req_flags))
1418                        complete(&io_req->tm_done);
1419        } else {
1420                /*
1421                 * We end up here when ABTS is issued as
1422                 * in asynchronous context, i.e., as part
1423                 * of task management completion, or
1424                 * when FW error is received or when the
1425                 * ABTS is issued when the IO is timed
1426                 * out.
1427                 */
1428
1429                if (io_req->on_active_queue) {
1430                        list_del_init(&io_req->link);
1431                        io_req->on_active_queue = 0;
1432                        /* Move IO req to retire queue */
1433                        list_add_tail(&io_req->link, &tgt->io_retire_queue);
1434                }
1435                bnx2fc_scsi_done(io_req, DID_ERROR);
1436                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1437        }
1438}
1439
1440static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1441{
1442        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1443        struct bnx2fc_rport *tgt = io_req->tgt;
1444        struct bnx2fc_cmd *cmd, *tmp;
1445        int tm_lun = sc_cmd->device->lun;
1446        int rc = 0;
1447        int lun;
1448
1449        /* called with tgt_lock held */
1450        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1451        /*
1452         * Walk thru the active_ios queue and ABORT the IO
1453         * that matches with the LUN that was reset
1454         */
1455        list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1456                BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1457                lun = cmd->sc_cmd->device->lun;
1458                if (lun == tm_lun) {
1459                        /* Initiate ABTS on this cmd */
1460                        if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1461                                              &cmd->req_flags)) {
1462                                /* cancel the IO timeout */
1463                                if (cancel_delayed_work(&io_req->timeout_work))
1464                                        kref_put(&io_req->refcount,
1465                                                 bnx2fc_cmd_release);
1466                                                        /* timer hold */
1467                                rc = bnx2fc_initiate_abts(cmd);
1468                                /* abts shouldn't fail in this context */
1469                                WARN_ON(rc != SUCCESS);
1470                        } else
1471                                printk(KERN_ERR PFX "lun_rst: abts already in"
1472                                        " progress for this IO 0x%x\n",
1473                                        cmd->xid);
1474                }
1475        }
1476}
1477
1478static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1479{
1480        struct bnx2fc_rport *tgt = io_req->tgt;
1481        struct bnx2fc_cmd *cmd, *tmp;
1482        int rc = 0;
1483
1484        /* called with tgt_lock held */
1485        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1486        /*
1487         * Walk thru the active_ios queue and ABORT the IO
1488         * that matches with the LUN that was reset
1489         */
1490        list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1491                BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1492                /* Initiate ABTS */
1493                if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1494                                                        &cmd->req_flags)) {
1495                        /* cancel the IO timeout */
1496                        if (cancel_delayed_work(&io_req->timeout_work))
1497                                kref_put(&io_req->refcount,
1498                                         bnx2fc_cmd_release); /* timer hold */
1499                        rc = bnx2fc_initiate_abts(cmd);
1500                        /* abts shouldn't fail in this context */
1501                        WARN_ON(rc != SUCCESS);
1502
1503                } else
1504                        printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1505                                " for this IO 0x%x\n", cmd->xid);
1506        }
1507}
1508
1509void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1510                             struct fcoe_task_ctx_entry *task, u8 num_rq)
1511{
1512        struct bnx2fc_mp_req *tm_req;
1513        struct fc_frame_header *fc_hdr;
1514        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1515        u64 *hdr;
1516        u64 *temp_hdr;
1517        void *rsp_buf;
1518
1519        /* Called with tgt_lock held */
1520        BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1521
1522        if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1523                set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1524        else {
1525                /* TM has already timed out and we got
1526                 * delayed completion. Ignore completion
1527                 * processing.
1528                 */
1529                return;
1530        }
1531
1532        tm_req = &(io_req->mp_req);
1533        fc_hdr = &(tm_req->resp_fc_hdr);
1534        hdr = (u64 *)fc_hdr;
1535        temp_hdr = (u64 *)
1536                &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1537        hdr[0] = cpu_to_be64(temp_hdr[0]);
1538        hdr[1] = cpu_to_be64(temp_hdr[1]);
1539        hdr[2] = cpu_to_be64(temp_hdr[2]);
1540
1541        tm_req->resp_len =
1542                task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1543
1544        rsp_buf = tm_req->resp_buf;
1545
1546        if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1547                bnx2fc_parse_fcp_rsp(io_req,
1548                                     (struct fcoe_fcp_rsp_payload *)
1549                                     rsp_buf, num_rq);
1550                if (io_req->fcp_rsp_code == 0) {
1551                        /* TM successful */
1552                        if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1553                                bnx2fc_lun_reset_cmpl(io_req);
1554                        else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1555                                bnx2fc_tgt_reset_cmpl(io_req);
1556                }
1557        } else {
1558                printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1559                        fc_hdr->fh_r_ctl);
1560        }
1561        if (!sc_cmd->SCp.ptr) {
1562                printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1563                return;
1564        }
1565        switch (io_req->fcp_status) {
1566        case FC_GOOD:
1567                if (io_req->cdb_status == 0) {
1568                        /* Good IO completion */
1569                        sc_cmd->result = DID_OK << 16;
1570                } else {
1571                        /* Transport status is good, SCSI status not good */
1572                        sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1573                }
1574                if (io_req->fcp_resid)
1575                        scsi_set_resid(sc_cmd, io_req->fcp_resid);
1576                break;
1577
1578        default:
1579                BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1580                           io_req->fcp_status);
1581                break;
1582        }
1583
1584        sc_cmd = io_req->sc_cmd;
1585        io_req->sc_cmd = NULL;
1586
1587        /* check if the io_req exists in tgt's tmf_q */
1588        if (io_req->on_tmf_queue) {
1589
1590                list_del_init(&io_req->link);
1591                io_req->on_tmf_queue = 0;
1592        } else {
1593
1594                printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1595                return;
1596        }
1597
1598        sc_cmd->SCp.ptr = NULL;
1599        sc_cmd->scsi_done(sc_cmd);
1600
1601        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1602        if (io_req->wait_for_comp) {
1603                BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1604                complete(&io_req->tm_done);
1605        }
1606}
1607
1608static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1609                           int bd_index)
1610{
1611        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1612        int frag_size, sg_frags;
1613
1614        sg_frags = 0;
1615        while (sg_len) {
1616                if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1617                        frag_size = BNX2FC_BD_SPLIT_SZ;
1618                else
1619                        frag_size = sg_len;
1620                bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1621                bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1622                bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1623                bd[bd_index + sg_frags].flags = 0;
1624
1625                addr += (u64) frag_size;
1626                sg_frags++;
1627                sg_len -= frag_size;
1628        }
1629        return sg_frags;
1630
1631}
1632
1633static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1634{
1635        struct bnx2fc_interface *interface = io_req->port->priv;
1636        struct bnx2fc_hba *hba = interface->hba;
1637        struct scsi_cmnd *sc = io_req->sc_cmd;
1638        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1639        struct scatterlist *sg;
1640        int byte_count = 0;
1641        int sg_count = 0;
1642        int bd_count = 0;
1643        int sg_frags;
1644        unsigned int sg_len;
1645        u64 addr;
1646        int i;
1647
1648        sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1649                              scsi_sg_count(sc), sc->sc_data_direction);
1650        scsi_for_each_sg(sc, sg, sg_count, i) {
1651                sg_len = sg_dma_len(sg);
1652                addr = sg_dma_address(sg);
1653                if (sg_len > BNX2FC_MAX_BD_LEN) {
1654                        sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1655                                                   bd_count);
1656                } else {
1657
1658                        sg_frags = 1;
1659                        bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1660                        bd[bd_count].buf_addr_hi  = addr >> 32;
1661                        bd[bd_count].buf_len = (u16)sg_len;
1662                        bd[bd_count].flags = 0;
1663                }
1664                bd_count += sg_frags;
1665                byte_count += sg_len;
1666        }
1667        if (byte_count != scsi_bufflen(sc))
1668                printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1669                        "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1670                        io_req->xid);
1671        return bd_count;
1672}
1673
1674static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1675{
1676        struct scsi_cmnd *sc = io_req->sc_cmd;
1677        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1678        int bd_count;
1679
1680        if (scsi_sg_count(sc)) {
1681                bd_count = bnx2fc_map_sg(io_req);
1682                if (bd_count == 0)
1683                        return -ENOMEM;
1684        } else {
1685                bd_count = 0;
1686                bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1687                bd[0].buf_len = bd[0].flags = 0;
1688        }
1689        io_req->bd_tbl->bd_valid = bd_count;
1690
1691        return 0;
1692}
1693
1694static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1695{
1696        struct scsi_cmnd *sc = io_req->sc_cmd;
1697
1698        if (io_req->bd_tbl->bd_valid && sc) {
1699                scsi_dma_unmap(sc);
1700                io_req->bd_tbl->bd_valid = 0;
1701        }
1702}
1703
1704void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1705                                  struct fcp_cmnd *fcp_cmnd)
1706{
1707        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1708        char tag[2];
1709
1710        memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1711
1712        int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1713
1714        fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1715        memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1716
1717        fcp_cmnd->fc_cmdref = 0;
1718        fcp_cmnd->fc_pri_ta = 0;
1719        fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1720        fcp_cmnd->fc_flags = io_req->io_req_flags;
1721
1722        if (scsi_populate_tag_msg(sc_cmd, tag)) {
1723                switch (tag[0]) {
1724                case HEAD_OF_QUEUE_TAG:
1725                        fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1726                        break;
1727                case ORDERED_QUEUE_TAG:
1728                        fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1729                        break;
1730                default:
1731                        fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1732                        break;
1733                }
1734        } else {
1735                fcp_cmnd->fc_pri_ta = 0;
1736        }
1737}
1738
1739static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1740                                 struct fcoe_fcp_rsp_payload *fcp_rsp,
1741                                 u8 num_rq)
1742{
1743        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1744        struct bnx2fc_rport *tgt = io_req->tgt;
1745        u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1746        u32 rq_buff_len = 0;
1747        int i;
1748        unsigned char *rq_data;
1749        unsigned char *dummy;
1750        int fcp_sns_len = 0;
1751        int fcp_rsp_len = 0;
1752
1753        io_req->fcp_status = FC_GOOD;
1754        io_req->fcp_resid = fcp_rsp->fcp_resid;
1755
1756        io_req->scsi_comp_flags = rsp_flags;
1757        CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1758                                fcp_rsp->scsi_status_code;
1759
1760        /* Fetch fcp_rsp_info and fcp_sns_info if available */
1761        if (num_rq) {
1762
1763                /*
1764                 * We do not anticipate num_rq >1, as the linux defined
1765                 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1766                 * 256 bytes of single rq buffer is good enough to hold this.
1767                 */
1768
1769                if (rsp_flags &
1770                    FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1771                        fcp_rsp_len = rq_buff_len
1772                                        = fcp_rsp->fcp_rsp_len;
1773                }
1774
1775                if (rsp_flags &
1776                    FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1777                        fcp_sns_len = fcp_rsp->fcp_sns_len;
1778                        rq_buff_len += fcp_rsp->fcp_sns_len;
1779                }
1780
1781                io_req->fcp_rsp_len = fcp_rsp_len;
1782                io_req->fcp_sns_len = fcp_sns_len;
1783
1784                if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1785                        /* Invalid sense sense length. */
1786                        printk(KERN_ERR PFX "invalid sns length %d\n",
1787                                rq_buff_len);
1788                        /* reset rq_buff_len */
1789                        rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1790                }
1791
1792                rq_data = bnx2fc_get_next_rqe(tgt, 1);
1793
1794                if (num_rq > 1) {
1795                        /* We do not need extra sense data */
1796                        for (i = 1; i < num_rq; i++)
1797                                dummy = bnx2fc_get_next_rqe(tgt, 1);
1798                }
1799
1800                /* fetch fcp_rsp_code */
1801                if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1802                        /* Only for task management function */
1803                        io_req->fcp_rsp_code = rq_data[3];
1804                        printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1805                                io_req->fcp_rsp_code);
1806                }
1807
1808                /* fetch sense data */
1809                rq_data += fcp_rsp_len;
1810
1811                if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1812                        printk(KERN_ERR PFX "Truncating sense buffer\n");
1813                        fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1814                }
1815
1816                memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1817                if (fcp_sns_len)
1818                        memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1819
1820                /* return RQ entries */
1821                for (i = 0; i < num_rq; i++)
1822                        bnx2fc_return_rqe(tgt, 1);
1823        }
1824}
1825
1826/**
1827 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1828 *
1829 * @host:       The Scsi_Host the command was issued to
1830 * @sc_cmd:     struct scsi_cmnd to be executed
1831 *
1832 * This is the IO strategy routine, called by SCSI-ML
1833 **/
1834int bnx2fc_queuecommand(struct Scsi_Host *host,
1835                        struct scsi_cmnd *sc_cmd)
1836{
1837        struct fc_lport *lport = shost_priv(host);
1838        struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1839        struct fc_rport_libfc_priv *rp = rport->dd_data;
1840        struct bnx2fc_rport *tgt;
1841        struct bnx2fc_cmd *io_req;
1842        int rc = 0;
1843        int rval;
1844
1845        rval = fc_remote_port_chkready(rport);
1846        if (rval) {
1847                sc_cmd->result = rval;
1848                sc_cmd->scsi_done(sc_cmd);
1849                return 0;
1850        }
1851
1852        if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1853                rc = SCSI_MLQUEUE_HOST_BUSY;
1854                goto exit_qcmd;
1855        }
1856
1857        /* rport and tgt are allocated together, so tgt should be non-NULL */
1858        tgt = (struct bnx2fc_rport *)&rp[1];
1859
1860        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1861                /*
1862                 * Session is not offloaded yet. Let SCSI-ml retry
1863                 * the command.
1864                 */
1865                rc = SCSI_MLQUEUE_TARGET_BUSY;
1866                goto exit_qcmd;
1867        }
1868
1869        io_req = bnx2fc_cmd_alloc(tgt);
1870        if (!io_req) {
1871                rc = SCSI_MLQUEUE_HOST_BUSY;
1872                goto exit_qcmd;
1873        }
1874        io_req->sc_cmd = sc_cmd;
1875
1876        if (bnx2fc_post_io_req(tgt, io_req)) {
1877                printk(KERN_ERR PFX "Unable to post io_req\n");
1878                rc = SCSI_MLQUEUE_HOST_BUSY;
1879                goto exit_qcmd;
1880        }
1881exit_qcmd:
1882        return rc;
1883}
1884
1885void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1886                                   struct fcoe_task_ctx_entry *task,
1887                                   u8 num_rq)
1888{
1889        struct fcoe_fcp_rsp_payload *fcp_rsp;
1890        struct bnx2fc_rport *tgt = io_req->tgt;
1891        struct scsi_cmnd *sc_cmd;
1892        struct Scsi_Host *host;
1893
1894
1895        /* scsi_cmd_cmpl is called with tgt lock held */
1896
1897        if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1898                /* we will not receive ABTS response for this IO */
1899                BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1900                           "this scsi cmd\n");
1901        }
1902
1903        /* Cancel the timeout_work, as we received IO completion */
1904        if (cancel_delayed_work(&io_req->timeout_work))
1905                kref_put(&io_req->refcount,
1906                         bnx2fc_cmd_release); /* drop timer hold */
1907
1908        sc_cmd = io_req->sc_cmd;
1909        if (sc_cmd == NULL) {
1910                printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1911                return;
1912        }
1913
1914        /* Fetch fcp_rsp from task context and perform cmd completion */
1915        fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1916                   &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1917
1918        /* parse fcp_rsp and obtain sense data from RQ if available */
1919        bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1920
1921        host = sc_cmd->device->host;
1922        if (!sc_cmd->SCp.ptr) {
1923                printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1924                return;
1925        }
1926
1927        if (io_req->on_active_queue) {
1928                list_del_init(&io_req->link);
1929                io_req->on_active_queue = 0;
1930                /* Move IO req to retire queue */
1931                list_add_tail(&io_req->link, &tgt->io_retire_queue);
1932        } else {
1933                /* This should not happen, but could have been pulled
1934                 * by bnx2fc_flush_active_ios(), or during a race
1935                 * between command abort and (late) completion.
1936                 */
1937                BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1938                if (io_req->wait_for_comp)
1939                        if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1940                                               &io_req->req_flags))
1941                                complete(&io_req->tm_done);
1942        }
1943
1944        bnx2fc_unmap_sg_list(io_req);
1945        io_req->sc_cmd = NULL;
1946
1947        switch (io_req->fcp_status) {
1948        case FC_GOOD:
1949                if (io_req->cdb_status == 0) {
1950                        /* Good IO completion */
1951                        sc_cmd->result = DID_OK << 16;
1952                } else {
1953                        /* Transport status is good, SCSI status not good */
1954                        BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1955                                 " fcp_resid = 0x%x\n",
1956                                io_req->cdb_status, io_req->fcp_resid);
1957                        sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1958                }
1959                if (io_req->fcp_resid)
1960                        scsi_set_resid(sc_cmd, io_req->fcp_resid);
1961                break;
1962        default:
1963                printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1964                        io_req->fcp_status);
1965                break;
1966        }
1967        sc_cmd->SCp.ptr = NULL;
1968        sc_cmd->scsi_done(sc_cmd);
1969        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1970}
1971
1972int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1973                               struct bnx2fc_cmd *io_req)
1974{
1975        struct fcoe_task_ctx_entry *task;
1976        struct fcoe_task_ctx_entry *task_page;
1977        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1978        struct fcoe_port *port = tgt->port;
1979        struct bnx2fc_interface *interface = port->priv;
1980        struct bnx2fc_hba *hba = interface->hba;
1981        struct fc_lport *lport = port->lport;
1982        struct fc_stats *stats;
1983        int task_idx, index;
1984        u16 xid;
1985
1986        /* Initialize rest of io_req fields */
1987        io_req->cmd_type = BNX2FC_SCSI_CMD;
1988        io_req->port = port;
1989        io_req->tgt = tgt;
1990        io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1991        sc_cmd->SCp.ptr = (char *)io_req;
1992
1993        stats = per_cpu_ptr(lport->stats, get_cpu());
1994        if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1995                io_req->io_req_flags = BNX2FC_READ;
1996                stats->InputRequests++;
1997                stats->InputBytes += io_req->data_xfer_len;
1998        } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1999                io_req->io_req_flags = BNX2FC_WRITE;
2000                stats->OutputRequests++;

2001                stats->OutputBytes += io_req->data_xfer_len;
2002        } else {
2003                io_req->io_req_flags = 0;
2004                stats->ControlRequests++;
2005        }
2006        put_cpu();
2007
2008        xid = io_req->xid;
2009
2010        /* Build buffer descriptor list for firmware from sg list */
2011        if (bnx2fc_build_bd_list_from_sg(io_req)) {
2012                printk(KERN_ERR PFX "BD list creation failed\n");
2013                spin_lock_bh(&tgt->tgt_lock);
2014                kref_put(&io_req->refcount, bnx2fc_cmd_release);
2015                spin_unlock_bh(&tgt->tgt_lock);
2016                return -EAGAIN;
2017        }
2018
2019        task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2020        index = xid % BNX2FC_TASKS_PER_PAGE;
2021
2022        /* Initialize task context for this IO request */
2023        task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2024        task = &(task_page[index]);
2025        bnx2fc_init_task(io_req, task);
2026
2027        spin_lock_bh(&tgt->tgt_lock);
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                spin_unlock_bh(&tgt->tgt_lock);
2033                return -EAGAIN;
2034        }
2035
2036        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2037                printk(KERN_ERR PFX "Session not ready...post_io\n");
2038                kref_put(&io_req->refcount, bnx2fc_cmd_release);
2039                spin_unlock_bh(&tgt->tgt_lock);
2040                return -EAGAIN;
2041        }
2042
2043        /* Time IO req */
2044        if (tgt->io_timeout)
2045                bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2046        /* Obtain free SQ entry */
2047        bnx2fc_add_2_sq(tgt, xid);
2048
2049        /* Enqueue the io_req to active_cmd_queue */
2050
2051        io_req->on_active_queue = 1;
2052        /* move io_req from pending_queue to active_queue */
2053        list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2054
2055        /* Ring doorbell */
2056        bnx2fc_ring_doorbell(tgt);
2057        spin_unlock_bh(&tgt->tgt_lock);
2058        return 0;
2059}
2060