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 - 2011 Broadcom Corporation
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation.
   9 *
  10 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
  11 */
  12
  13#include "bnx2fc.h"
  14
  15#define RESERVE_FREE_LIST_INDEX num_possible_cpus()
  16
  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                                                u16 min_xid, u16 max_xid)
 244{
 245        struct bnx2fc_cmd_mgr *cmgr;
 246        struct io_bdt *bdt_info;
 247        struct bnx2fc_cmd *io_req;
 248        size_t len;
 249        u32 mem_size;
 250        u16 xid;
 251        int i;
 252        int num_ios, num_pri_ios;
 253        size_t bd_tbl_sz;
 254        int arr_sz = num_possible_cpus() + 1;
 255
 256        if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 257                printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
 258                                        and max_xid 0x%x\n", min_xid, max_xid);
 259                return NULL;
 260        }
 261        BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
 262
 263        num_ios = max_xid - min_xid + 1;
 264        len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
 265        len += sizeof(struct bnx2fc_cmd_mgr);
 266
 267        cmgr = kzalloc(len, GFP_KERNEL);
 268        if (!cmgr) {
 269                printk(KERN_ERR PFX "failed to alloc cmgr\n");
 270                return NULL;
 271        }
 272
 273        cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
 274                                  arr_sz, GFP_KERNEL);
 275        if (!cmgr->free_list) {
 276                printk(KERN_ERR PFX "failed to alloc free_list\n");
 277                goto mem_err;
 278        }
 279
 280        cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
 281                                       arr_sz, GFP_KERNEL);
 282        if (!cmgr->free_list_lock) {
 283                printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
 284                goto mem_err;
 285        }
 286
 287        cmgr->hba = hba;
 288        cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 289
 290        for (i = 0; i < arr_sz; i++)  {
 291                INIT_LIST_HEAD(&cmgr->free_list[i]);
 292                spin_lock_init(&cmgr->free_list_lock[i]);
 293        }
 294
 295        /*
 296         * Pre-allocated pool of bnx2fc_cmds.
 297         * Last entry in the free list array is the free list
 298         * of slow path requests.
 299         */
 300        xid = BNX2FC_MIN_XID;
 301        num_pri_ios = num_ios - BNX2FC_ELSTM_XIDS;
 302        for (i = 0; i < num_ios; i++) {
 303                io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
 304
 305                if (!io_req) {
 306                        printk(KERN_ERR PFX "failed to alloc io_req\n");
 307                        goto mem_err;
 308                }
 309
 310                INIT_LIST_HEAD(&io_req->link);
 311                INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
 312
 313                io_req->xid = xid++;
 314                if (i < num_pri_ios)
 315                        list_add_tail(&io_req->link,
 316                                &cmgr->free_list[io_req->xid %
 317                                                 num_possible_cpus()]);
 318                else
 319                        list_add_tail(&io_req->link,
 320                                &cmgr->free_list[num_possible_cpus()]);
 321                io_req++;
 322        }
 323
 324        /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 325        mem_size = num_ios * sizeof(struct io_bdt *);
 326        cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
 327        if (!cmgr->io_bdt_pool) {
 328                printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 329                goto mem_err;
 330        }
 331
 332        mem_size = sizeof(struct io_bdt);
 333        for (i = 0; i < num_ios; i++) {
 334                cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
 335                if (!cmgr->io_bdt_pool[i]) {
 336                        printk(KERN_ERR PFX "failed to alloc "
 337                                "io_bdt_pool[%d]\n", i);
 338                        goto mem_err;
 339                }
 340        }
 341
 342        /* Allocate an map fcoe_bdt_ctx structures */
 343        bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 344        for (i = 0; i < num_ios; i++) {
 345                bdt_info = cmgr->io_bdt_pool[i];
 346                bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
 347                                                      bd_tbl_sz,
 348                                                      &bdt_info->bd_tbl_dma,
 349                                                      GFP_KERNEL);
 350                if (!bdt_info->bd_tbl) {
 351                        printk(KERN_ERR PFX "failed to alloc "
 352                                "bdt_tbl[%d]\n", i);
 353                        goto mem_err;
 354                }
 355        }
 356
 357        return cmgr;
 358
 359mem_err:
 360        bnx2fc_cmd_mgr_free(cmgr);
 361        return NULL;
 362}
 363
 364void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
 365{
 366        struct io_bdt *bdt_info;
 367        struct bnx2fc_hba *hba = cmgr->hba;
 368        size_t bd_tbl_sz;
 369        u16 min_xid = BNX2FC_MIN_XID;
 370        u16 max_xid = BNX2FC_MAX_XID;
 371        int num_ios;
 372        int i;
 373
 374        num_ios = max_xid - min_xid + 1;
 375
 376        /* Free fcoe_bdt_ctx structures */
 377        if (!cmgr->io_bdt_pool)
 378                goto free_cmd_pool;
 379
 380        bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
 381        for (i = 0; i < num_ios; i++) {
 382                bdt_info = cmgr->io_bdt_pool[i];
 383                if (bdt_info->bd_tbl) {
 384                        dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
 385                                            bdt_info->bd_tbl,
 386                                            bdt_info->bd_tbl_dma);
 387                        bdt_info->bd_tbl = NULL;
 388                }
 389        }
 390
 391        /* Destroy io_bdt pool */
 392        for (i = 0; i < num_ios; i++) {
 393                kfree(cmgr->io_bdt_pool[i]);
 394                cmgr->io_bdt_pool[i] = NULL;
 395        }
 396
 397        kfree(cmgr->io_bdt_pool);
 398        cmgr->io_bdt_pool = NULL;
 399
 400free_cmd_pool:
 401        kfree(cmgr->free_list_lock);
 402
 403        /* Destroy cmd pool */
 404        if (!cmgr->free_list)
 405                goto free_cmgr;
 406
 407        for (i = 0; i < num_possible_cpus() + 1; i++)  {
 408                struct list_head *list;
 409                struct list_head *tmp;
 410
 411                list_for_each_safe(list, tmp, &cmgr->free_list[i]) {
 412                        struct bnx2fc_cmd *io_req = (struct bnx2fc_cmd *)list;
 413                        list_del(&io_req->link);
 414                        kfree(io_req);
 415                }
 416        }
 417        kfree(cmgr->free_list);
 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_req_bd) {
 659                printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
 660                bnx2fc_free_mp_resc(io_req);
 661                return FAILED;
 662        }
 663        /* Fill bd table */
 664        addr = mp_req->req_buf_dma;
 665        mp_req_bd = mp_req->mp_req_bd;
 666        mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 667        mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 668        mp_req_bd->buf_len = PAGE_SIZE;
 669        mp_req_bd->flags = 0;
 670
 671        /*
 672         * MP buffer is either a task mgmt command or an ELS.
 673         * So the assumption is that it consumes a single bd
 674         * entry in the bd table
 675         */
 676        mp_resp_bd = mp_req->mp_resp_bd;
 677        addr = mp_req->resp_buf_dma;
 678        mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
 679        mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
 680        mp_resp_bd->buf_len = PAGE_SIZE;
 681        mp_resp_bd->flags = 0;
 682
 683        return SUCCESS;
 684}
 685
 686static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
 687{
 688        struct fc_lport *lport;
 689        struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
 690        struct fc_rport_libfc_priv *rp = rport->dd_data;
 691        struct fcoe_port *port;
 692        struct bnx2fc_interface *interface;
 693        struct bnx2fc_rport *tgt;
 694        struct bnx2fc_cmd *io_req;
 695        struct bnx2fc_mp_req *tm_req;
 696        struct fcoe_task_ctx_entry *task;
 697        struct fcoe_task_ctx_entry *task_page;
 698        struct Scsi_Host *host = sc_cmd->device->host;
 699        struct fc_frame_header *fc_hdr;
 700        struct fcp_cmnd *fcp_cmnd;
 701        int task_idx, index;
 702        int rc = SUCCESS;
 703        u16 xid;
 704        u32 sid, did;
 705        unsigned long start = jiffies;
 706
 707        lport = shost_priv(host);
 708        port = lport_priv(lport);
 709        interface = port->priv;
 710
 711        if (rport == NULL) {
 712                printk(KERN_ERR PFX "device_reset: rport is NULL\n");
 713                rc = FAILED;
 714                goto tmf_err;
 715        }
 716
 717        rc = fc_block_scsi_eh(sc_cmd);
 718        if (rc)
 719                return rc;
 720
 721        if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 722                printk(KERN_ERR PFX "device_reset: link is not ready\n");
 723                rc = FAILED;
 724                goto tmf_err;
 725        }
 726        /* rport and tgt are allocated together, so tgt should be non-NULL */
 727        tgt = (struct bnx2fc_rport *)&rp[1];
 728
 729        if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
 730                printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
 731                rc = FAILED;
 732                goto tmf_err;
 733        }
 734retry_tmf:
 735        io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
 736        if (!io_req) {
 737                if (time_after(jiffies, start + HZ)) {
 738                        printk(KERN_ERR PFX "tmf: Failed TMF");
 739                        rc = FAILED;
 740                        goto tmf_err;
 741                }
 742                msleep(20);
 743                goto retry_tmf;
 744        }
 745        /* Initialize rest of io_req fields */
 746        io_req->sc_cmd = sc_cmd;
 747        io_req->port = port;
 748        io_req->tgt = tgt;
 749
 750        tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
 751
 752        rc = bnx2fc_init_mp_req(io_req);
 753        if (rc == FAILED) {
 754                printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
 755                spin_lock_bh(&tgt->tgt_lock);
 756                kref_put(&io_req->refcount, bnx2fc_cmd_release);
 757                spin_unlock_bh(&tgt->tgt_lock);
 758                goto tmf_err;
 759        }
 760
 761        /* Set TM flags */
 762        io_req->io_req_flags = 0;
 763        tm_req->tm_flags = tm_flags;
 764
 765        /* Fill FCP_CMND */
 766        bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
 767        fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
 768        memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
 769        fcp_cmnd->fc_dl = 0;
 770
 771        /* Fill FC header */
 772        fc_hdr = &(tm_req->req_fc_hdr);
 773        sid = tgt->sid;
 774        did = rport->port_id;
 775        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
 776                           FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 777                           FC_FC_SEQ_INIT, 0);
 778        /* Obtain exchange id */
 779        xid = io_req->xid;
 780
 781        BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
 782        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 783        index = xid % BNX2FC_TASKS_PER_PAGE;
 784
 785        /* Initialize task context for this IO request */
 786        task_page = (struct fcoe_task_ctx_entry *)
 787                        interface->hba->task_ctx[task_idx];
 788        task = &(task_page[index]);
 789        bnx2fc_init_mp_task(io_req, task);
 790
 791        sc_cmd->SCp.ptr = (char *)io_req;
 792
 793        /* Obtain free SQ entry */
 794        spin_lock_bh(&tgt->tgt_lock);
 795        bnx2fc_add_2_sq(tgt, xid);
 796
 797        /* Enqueue the io_req to active_tm_queue */
 798        io_req->on_tmf_queue = 1;
 799        list_add_tail(&io_req->link, &tgt->active_tm_queue);
 800
 801        init_completion(&io_req->tm_done);
 802        io_req->wait_for_comp = 1;
 803
 804        /* Ring doorbell */
 805        bnx2fc_ring_doorbell(tgt);
 806        spin_unlock_bh(&tgt->tgt_lock);
 807
 808        rc = wait_for_completion_timeout(&io_req->tm_done,
 809                                         BNX2FC_TM_TIMEOUT * HZ);
 810        spin_lock_bh(&tgt->tgt_lock);
 811
 812        io_req->wait_for_comp = 0;
 813        if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags)))
 814                set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
 815
 816        spin_unlock_bh(&tgt->tgt_lock);
 817
 818        if (!rc) {
 819                BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
 820                rc = FAILED;
 821        } else {
 822                BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
 823                rc = SUCCESS;
 824        }
 825tmf_err:
 826        return rc;
 827}
 828
 829int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
 830{
 831        struct fc_lport *lport;
 832        struct bnx2fc_rport *tgt = io_req->tgt;
 833        struct fc_rport *rport = tgt->rport;
 834        struct fc_rport_priv *rdata = tgt->rdata;
 835        struct bnx2fc_interface *interface;
 836        struct fcoe_port *port;
 837        struct bnx2fc_cmd *abts_io_req;
 838        struct fcoe_task_ctx_entry *task;
 839        struct fcoe_task_ctx_entry *task_page;
 840        struct fc_frame_header *fc_hdr;
 841        struct bnx2fc_mp_req *abts_req;
 842        int task_idx, index;
 843        u32 sid, did;
 844        u16 xid;
 845        int rc = SUCCESS;
 846        u32 r_a_tov = rdata->r_a_tov;
 847
 848        /* called with tgt_lock held */
 849        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
 850
 851        port = io_req->port;
 852        interface = port->priv;
 853        lport = port->lport;
 854
 855        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
 856                printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
 857                rc = FAILED;
 858                goto abts_err;
 859        }
 860
 861        if (rport == NULL) {
 862                printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
 863                rc = FAILED;
 864                goto abts_err;
 865        }
 866
 867        if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
 868                printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
 869                rc = FAILED;
 870                goto abts_err;
 871        }
 872
 873        abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
 874        if (!abts_io_req) {
 875                printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
 876                rc = FAILED;
 877                goto abts_err;
 878        }
 879
 880        /* Initialize rest of io_req fields */
 881        abts_io_req->sc_cmd = NULL;
 882        abts_io_req->port = port;
 883        abts_io_req->tgt = tgt;
 884        abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
 885
 886        abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
 887        memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
 888
 889        /* Fill FC header */
 890        fc_hdr = &(abts_req->req_fc_hdr);
 891
 892        /* Obtain oxid and rxid for the original exchange to be aborted */
 893        fc_hdr->fh_ox_id = htons(io_req->xid);
 894        fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
 895
 896        sid = tgt->sid;
 897        did = rport->port_id;
 898
 899        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
 900                           FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
 901                           FC_FC_SEQ_INIT, 0);
 902
 903        xid = abts_io_req->xid;
 904        BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
 905        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 906        index = xid % BNX2FC_TASKS_PER_PAGE;
 907
 908        /* Initialize task context for this IO request */
 909        task_page = (struct fcoe_task_ctx_entry *)
 910                        interface->hba->task_ctx[task_idx];
 911        task = &(task_page[index]);
 912        bnx2fc_init_mp_task(abts_io_req, task);
 913
 914        /*
 915         * ABTS task is a temporary task that will be cleaned up
 916         * irrespective of ABTS response. We need to start the timer
 917         * for the original exchange, as the CQE is posted for the original
 918         * IO request.
 919         *
 920         * Timer for ABTS is started only when it is originated by a
 921         * TM request. For the ABTS issued as part of ULP timeout,
 922         * scsi-ml maintains the timers.
 923         */
 924
 925        /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
 926        bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
 927
 928        /* Obtain free SQ entry */
 929        bnx2fc_add_2_sq(tgt, xid);
 930
 931        /* Ring doorbell */
 932        bnx2fc_ring_doorbell(tgt);
 933
 934abts_err:
 935        return rc;
 936}
 937
 938int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
 939                                enum fc_rctl r_ctl)
 940{
 941        struct fc_lport *lport;
 942        struct bnx2fc_rport *tgt = orig_io_req->tgt;
 943        struct bnx2fc_interface *interface;
 944        struct fcoe_port *port;
 945        struct bnx2fc_cmd *seq_clnp_req;
 946        struct fcoe_task_ctx_entry *task;
 947        struct fcoe_task_ctx_entry *task_page;
 948        struct bnx2fc_els_cb_arg *cb_arg = NULL;
 949        int task_idx, index;
 950        u16 xid;
 951        int rc = 0;
 952
 953        BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
 954                   orig_io_req->xid);
 955        kref_get(&orig_io_req->refcount);
 956
 957        port = orig_io_req->port;
 958        interface = port->priv;
 959        lport = port->lport;
 960
 961        cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
 962        if (!cb_arg) {
 963                printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
 964                rc = -ENOMEM;
 965                goto cleanup_err;
 966        }
 967
 968        seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
 969        if (!seq_clnp_req) {
 970                printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
 971                rc = -ENOMEM;
 972                kfree(cb_arg);
 973                goto cleanup_err;
 974        }
 975        /* Initialize rest of io_req fields */
 976        seq_clnp_req->sc_cmd = NULL;
 977        seq_clnp_req->port = port;
 978        seq_clnp_req->tgt = tgt;
 979        seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
 980
 981        xid = seq_clnp_req->xid;
 982
 983        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
 984        index = xid % BNX2FC_TASKS_PER_PAGE;
 985
 986        /* Initialize task context for this IO request */
 987        task_page = (struct fcoe_task_ctx_entry *)
 988                     interface->hba->task_ctx[task_idx];
 989        task = &(task_page[index]);
 990        cb_arg->aborted_io_req = orig_io_req;
 991        cb_arg->io_req = seq_clnp_req;
 992        cb_arg->r_ctl = r_ctl;
 993        cb_arg->offset = offset;
 994        seq_clnp_req->cb_arg = cb_arg;
 995
 996        printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
 997        bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
 998
 999        /* Obtain free SQ entry */
1000        bnx2fc_add_2_sq(tgt, xid);

1001
1002        /* Ring doorbell */
1003        bnx2fc_ring_doorbell(tgt);
1004cleanup_err:
1005        return rc;
1006}
1007
1008int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1009{
1010        struct fc_lport *lport;
1011        struct bnx2fc_rport *tgt = io_req->tgt;
1012        struct bnx2fc_interface *interface;
1013        struct fcoe_port *port;
1014        struct bnx2fc_cmd *cleanup_io_req;
1015        struct fcoe_task_ctx_entry *task;
1016        struct fcoe_task_ctx_entry *task_page;
1017        int task_idx, index;
1018        u16 xid, orig_xid;
1019        int rc = 0;
1020
1021        /* ASSUMPTION: called with tgt_lock held */
1022        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1023
1024        port = io_req->port;
1025        interface = port->priv;
1026        lport = port->lport;
1027
1028        cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1029        if (!cleanup_io_req) {
1030                printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1031                rc = -1;
1032                goto cleanup_err;
1033        }
1034
1035        /* Initialize rest of io_req fields */
1036        cleanup_io_req->sc_cmd = NULL;
1037        cleanup_io_req->port = port;
1038        cleanup_io_req->tgt = tgt;
1039        cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1040
1041        xid = cleanup_io_req->xid;
1042
1043        task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1044        index = xid % BNX2FC_TASKS_PER_PAGE;
1045
1046        /* Initialize task context for this IO request */
1047        task_page = (struct fcoe_task_ctx_entry *)
1048                        interface->hba->task_ctx[task_idx];
1049        task = &(task_page[index]);
1050        orig_xid = io_req->xid;
1051
1052        BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1053
1054        bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1055
1056        /* Obtain free SQ entry */
1057        bnx2fc_add_2_sq(tgt, xid);
1058
1059        /* Ring doorbell */
1060        bnx2fc_ring_doorbell(tgt);
1061
1062cleanup_err:
1063        return rc;
1064}
1065
1066/**
1067 * bnx2fc_eh_target_reset: Reset a target
1068 *
1069 * @sc_cmd:     SCSI command
1070 *
1071 * Set from SCSI host template to send task mgmt command to the target
1072 *      and wait for the response
1073 */
1074int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1075{
1076        return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1077}
1078
1079/**
1080 * bnx2fc_eh_device_reset - Reset a single LUN
1081 *
1082 * @sc_cmd:     SCSI command
1083 *
1084 * Set from SCSI host template to send task mgmt command to the target
1085 *      and wait for the response
1086 */
1087int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1088{
1089        return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1090}
1091
1092/**
1093 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1094 *                      SCSI command
1095 *
1096 * @sc_cmd:     SCSI_ML command pointer
1097 *
1098 * SCSI abort request handler
1099 */
1100int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1101{
1102        struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1103        struct fc_rport_libfc_priv *rp = rport->dd_data;
1104        struct bnx2fc_cmd *io_req;
1105        struct fc_lport *lport;
1106        struct fc_rport_priv *rdata;
1107        struct bnx2fc_rport *tgt;
1108        int logo_issued;
1109        int wait_cnt = 0;
1110        int rc = FAILED;
1111
1112
1113        rc = fc_block_scsi_eh(sc_cmd);
1114        if (rc)
1115                return rc;
1116
1117        lport = shost_priv(sc_cmd->device->host);
1118        if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1119                printk(KERN_ERR PFX "eh_abort: link not ready\n");
1120                return rc;
1121        }
1122
1123        tgt = (struct bnx2fc_rport *)&rp[1];
1124
1125        BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1126
1127        spin_lock_bh(&tgt->tgt_lock);
1128        io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1129        if (!io_req) {
1130                /* Command might have just completed */
1131                printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1132                spin_unlock_bh(&tgt->tgt_lock);
1133                return SUCCESS;
1134        }
1135        BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1136                      io_req->refcount.refcount.counter);
1137
1138        /* Hold IO request across abort processing */
1139        kref_get(&io_req->refcount);
1140
1141        BUG_ON(tgt != io_req->tgt);
1142
1143        /* Remove the io_req from the active_q. */
1144        /*
1145         * Task Mgmt functions (LUN RESET & TGT RESET) will not
1146         * issue an ABTS on this particular IO req, as the
1147         * io_req is no longer in the active_q.
1148         */
1149        if (tgt->flush_in_prog) {
1150                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1151                        "flush in progress\n", io_req->xid);
1152                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1153                spin_unlock_bh(&tgt->tgt_lock);
1154                return SUCCESS;
1155        }
1156
1157        if (io_req->on_active_queue == 0) {
1158                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1159                                "not on active_q\n", io_req->xid);
1160                /*
1161                 * This condition can happen only due to the FW bug,
1162                 * where we do not receive cleanup response from
1163                 * the FW. Handle this case gracefully by erroring
1164                 * back the IO request to SCSI-ml
1165                 */
1166                bnx2fc_scsi_done(io_req, DID_ABORT);
1167
1168                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1169                spin_unlock_bh(&tgt->tgt_lock);
1170                return SUCCESS;
1171        }
1172
1173        /*
1174         * Only eh_abort processing will remove the IO from
1175         * active_cmd_q before processing the request. this is
1176         * done to avoid race conditions between IOs aborted
1177         * as part of task management completion and eh_abort
1178         * processing
1179         */
1180        list_del_init(&io_req->link);
1181        io_req->on_active_queue = 0;
1182        /* Move IO req to retire queue */
1183        list_add_tail(&io_req->link, &tgt->io_retire_queue);
1184
1185        init_completion(&io_req->tm_done);
1186        io_req->wait_for_comp = 1;
1187
1188        if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1189                /* Cancel the current timer running on this io_req */
1190                if (cancel_delayed_work(&io_req->timeout_work))
1191                        kref_put(&io_req->refcount,
1192                                 bnx2fc_cmd_release); /* drop timer hold */
1193                set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1194                rc = bnx2fc_initiate_abts(io_req);
1195        } else {
1196                printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1197                                "already in abts processing\n", io_req->xid);
1198                if (cancel_delayed_work(&io_req->timeout_work))
1199                        kref_put(&io_req->refcount,
1200                                 bnx2fc_cmd_release); /* drop timer hold */
1201                bnx2fc_initiate_cleanup(io_req);
1202
1203                spin_unlock_bh(&tgt->tgt_lock);
1204
1205                wait_for_completion(&io_req->tm_done);
1206
1207                spin_lock_bh(&tgt->tgt_lock);
1208                io_req->wait_for_comp = 0;
1209                rdata = io_req->tgt->rdata;
1210                logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1211                                               &tgt->flags);
1212                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1213                spin_unlock_bh(&tgt->tgt_lock);
1214
1215                if (!logo_issued) {
1216                        BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1217                                      tgt->flags);
1218                        mutex_lock(&lport->disc.disc_mutex);
1219                        lport->tt.rport_logoff(rdata);
1220                        mutex_unlock(&lport->disc.disc_mutex);
1221                        do {
1222                                msleep(BNX2FC_RELOGIN_WAIT_TIME);
1223                                /*
1224                                 * If session not recovered, let SCSI-ml
1225                                 * escalate error recovery.
1226                                 */
1227                                if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT)
1228                                        return FAILED;
1229                        } while (!test_bit(BNX2FC_FLAG_SESSION_READY,
1230                                           &tgt->flags));
1231                }
1232                return SUCCESS;
1233        }
1234        if (rc == FAILED) {
1235                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1236                spin_unlock_bh(&tgt->tgt_lock);
1237                return rc;
1238        }
1239        spin_unlock_bh(&tgt->tgt_lock);
1240
1241        wait_for_completion(&io_req->tm_done);
1242
1243        spin_lock_bh(&tgt->tgt_lock);
1244        io_req->wait_for_comp = 0;
1245        if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1246                                    &io_req->req_flags))) {
1247                /* Let the scsi-ml try to recover this command */
1248                printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1249                       io_req->xid);
1250                rc = FAILED;
1251        } else {
1252                /*
1253                 * We come here even when there was a race condition
1254                 * between timeout and abts completion, and abts
1255                 * completion happens just in time.
1256                 */
1257                BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1258                rc = SUCCESS;
1259                bnx2fc_scsi_done(io_req, DID_ABORT);
1260                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1261        }
1262
1263        /* release the reference taken in eh_abort */
1264        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1265        spin_unlock_bh(&tgt->tgt_lock);
1266        return rc;
1267}
1268
1269void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1270                                      struct fcoe_task_ctx_entry *task,
1271                                      u8 rx_state)
1272{
1273        struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1274        struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1275        u32 offset = cb_arg->offset;
1276        enum fc_rctl r_ctl = cb_arg->r_ctl;
1277        int rc = 0;
1278        struct bnx2fc_rport *tgt = orig_io_req->tgt;
1279
1280        BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1281                              "cmd_type = %d\n",
1282                   seq_clnp_req->xid, seq_clnp_req->cmd_type);
1283
1284        if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1285                printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1286                        seq_clnp_req->xid);
1287                goto free_cb_arg;
1288        }
1289
1290        spin_unlock_bh(&tgt->tgt_lock);
1291        rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1292        spin_lock_bh(&tgt->tgt_lock);
1293
1294        if (rc)
1295                printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1296                        " IO will abort\n");
1297        seq_clnp_req->cb_arg = NULL;
1298        kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1299free_cb_arg:
1300        kfree(cb_arg);
1301        return;
1302}
1303
1304void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1305                                  struct fcoe_task_ctx_entry *task,
1306                                  u8 num_rq)
1307{
1308        BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1309                              "refcnt = %d, cmd_type = %d\n",
1310                   io_req->refcount.refcount.counter, io_req->cmd_type);
1311        bnx2fc_scsi_done(io_req, DID_ERROR);
1312        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1313        if (io_req->wait_for_comp)
1314                complete(&io_req->tm_done);
1315}
1316
1317void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1318                               struct fcoe_task_ctx_entry *task,
1319                               u8 num_rq)
1320{
1321        u32 r_ctl;
1322        u32 r_a_tov = FC_DEF_R_A_TOV;
1323        u8 issue_rrq = 0;
1324        struct bnx2fc_rport *tgt = io_req->tgt;
1325
1326        BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1327                              "refcnt = %d, cmd_type = %d\n",
1328                   io_req->xid,
1329                   io_req->refcount.refcount.counter, io_req->cmd_type);
1330
1331        if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1332                                       &io_req->req_flags)) {
1333                BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1334                                " this io\n");
1335                return;
1336        }
1337
1338        /* Do not issue RRQ as this IO is already cleanedup */
1339        if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1340                                &io_req->req_flags))
1341                goto io_compl;
1342
1343        /*
1344         * For ABTS issued due to SCSI eh_abort_handler, timeout
1345         * values are maintained by scsi-ml itself. Cancel timeout
1346         * in case ABTS issued as part of task management function
1347         * or due to FW error.
1348         */
1349        if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1350                if (cancel_delayed_work(&io_req->timeout_work))
1351                        kref_put(&io_req->refcount,
1352                                 bnx2fc_cmd_release); /* drop timer hold */
1353
1354        r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1355
1356        switch (r_ctl) {
1357        case FC_RCTL_BA_ACC:
1358                /*
1359                 * Dont release this cmd yet. It will be relesed
1360                 * after we get RRQ response
1361                 */
1362                BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1363                issue_rrq = 1;
1364                break;
1365
1366        case FC_RCTL_BA_RJT:
1367                BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1368                break;
1369        default:
1370                printk(KERN_ERR PFX "Unknown ABTS response\n");
1371                break;
1372        }
1373
1374        if (issue_rrq) {
1375                BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1376                set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1377        }
1378        set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1379        bnx2fc_cmd_timer_set(io_req, r_a_tov);
1380
1381io_compl:
1382        if (io_req->wait_for_comp) {
1383                if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1384                                       &io_req->req_flags))
1385                        complete(&io_req->tm_done);
1386        } else {
1387                /*
1388                 * We end up here when ABTS is issued as
1389                 * in asynchronous context, i.e., as part
1390                 * of task management completion, or
1391                 * when FW error is received or when the
1392                 * ABTS is issued when the IO is timed
1393                 * out.
1394                 */
1395
1396                if (io_req->on_active_queue) {
1397                        list_del_init(&io_req->link);
1398                        io_req->on_active_queue = 0;
1399                        /* Move IO req to retire queue */
1400                        list_add_tail(&io_req->link, &tgt->io_retire_queue);
1401                }
1402                bnx2fc_scsi_done(io_req, DID_ERROR);
1403                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1404        }
1405}
1406
1407static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1408{
1409        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1410        struct bnx2fc_rport *tgt = io_req->tgt;
1411        struct list_head *list;
1412        struct list_head *tmp;
1413        struct bnx2fc_cmd *cmd;
1414        int tm_lun = sc_cmd->device->lun;
1415        int rc = 0;
1416        int lun;
1417
1418        /* called with tgt_lock held */
1419        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1420        /*
1421         * Walk thru the active_ios queue and ABORT the IO
1422         * that matches with the LUN that was reset
1423         */
1424        list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1425                BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1426                cmd = (struct bnx2fc_cmd *)list;
1427                lun = cmd->sc_cmd->device->lun;
1428                if (lun == tm_lun) {
1429                        /* Initiate ABTS on this cmd */
1430                        if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1431                                              &cmd->req_flags)) {
1432                                /* cancel the IO timeout */
1433                                if (cancel_delayed_work(&io_req->timeout_work))
1434                                        kref_put(&io_req->refcount,
1435                                                 bnx2fc_cmd_release);
1436                                                        /* timer hold */
1437                                rc = bnx2fc_initiate_abts(cmd);
1438                                /* abts shouldn't fail in this context */
1439                                WARN_ON(rc != SUCCESS);
1440                        } else
1441                                printk(KERN_ERR PFX "lun_rst: abts already in"
1442                                        " progress for this IO 0x%x\n",
1443                                        cmd->xid);
1444                }
1445        }
1446}
1447
1448static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1449{
1450        struct bnx2fc_rport *tgt = io_req->tgt;
1451        struct list_head *list;
1452        struct list_head *tmp;
1453        struct bnx2fc_cmd *cmd;
1454        int rc = 0;
1455
1456        /* called with tgt_lock held */
1457        BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1458        /*
1459         * Walk thru the active_ios queue and ABORT the IO
1460         * that matches with the LUN that was reset
1461         */
1462        list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1463                BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1464                cmd = (struct bnx2fc_cmd *)list;
1465                /* Initiate ABTS */
1466                if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1467                                                        &cmd->req_flags)) {
1468                        /* cancel the IO timeout */
1469                        if (cancel_delayed_work(&io_req->timeout_work))
1470                                kref_put(&io_req->refcount,
1471                                         bnx2fc_cmd_release); /* timer hold */
1472                        rc = bnx2fc_initiate_abts(cmd);
1473                        /* abts shouldn't fail in this context */
1474                        WARN_ON(rc != SUCCESS);
1475
1476                } else
1477                        printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1478                                " for this IO 0x%x\n", cmd->xid);
1479        }
1480}
1481
1482void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1483                             struct fcoe_task_ctx_entry *task, u8 num_rq)
1484{
1485        struct bnx2fc_mp_req *tm_req;
1486        struct fc_frame_header *fc_hdr;
1487        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1488        u64 *hdr;
1489        u64 *temp_hdr;
1490        void *rsp_buf;
1491
1492        /* Called with tgt_lock held */
1493        BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1494
1495        if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1496                set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1497        else {
1498                /* TM has already timed out and we got
1499                 * delayed completion. Ignore completion
1500                 * processing.
1501                 */
1502                return;
1503        }
1504
1505        tm_req = &(io_req->mp_req);
1506        fc_hdr = &(tm_req->resp_fc_hdr);
1507        hdr = (u64 *)fc_hdr;
1508        temp_hdr = (u64 *)
1509                &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1510        hdr[0] = cpu_to_be64(temp_hdr[0]);
1511        hdr[1] = cpu_to_be64(temp_hdr[1]);
1512        hdr[2] = cpu_to_be64(temp_hdr[2]);
1513
1514        tm_req->resp_len =
1515                task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1516
1517        rsp_buf = tm_req->resp_buf;
1518
1519        if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1520                bnx2fc_parse_fcp_rsp(io_req,
1521                                     (struct fcoe_fcp_rsp_payload *)
1522                                     rsp_buf, num_rq);
1523                if (io_req->fcp_rsp_code == 0) {
1524                        /* TM successful */
1525                        if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1526                                bnx2fc_lun_reset_cmpl(io_req);
1527                        else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1528                                bnx2fc_tgt_reset_cmpl(io_req);
1529                }
1530        } else {
1531                printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1532                        fc_hdr->fh_r_ctl);
1533        }
1534        if (!sc_cmd->SCp.ptr) {
1535                printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1536                return;
1537        }
1538        switch (io_req->fcp_status) {
1539        case FC_GOOD:
1540                if (io_req->cdb_status == 0) {
1541                        /* Good IO completion */
1542                        sc_cmd->result = DID_OK << 16;
1543                } else {
1544                        /* Transport status is good, SCSI status not good */
1545                        sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1546                }
1547                if (io_req->fcp_resid)
1548                        scsi_set_resid(sc_cmd, io_req->fcp_resid);
1549                break;
1550
1551        default:
1552                BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1553                           io_req->fcp_status);
1554                break;
1555        }
1556
1557        sc_cmd = io_req->sc_cmd;
1558        io_req->sc_cmd = NULL;
1559
1560        /* check if the io_req exists in tgt's tmf_q */
1561        if (io_req->on_tmf_queue) {
1562
1563                list_del_init(&io_req->link);
1564                io_req->on_tmf_queue = 0;
1565        } else {
1566
1567                printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1568                return;
1569        }
1570
1571        sc_cmd->SCp.ptr = NULL;
1572        sc_cmd->scsi_done(sc_cmd);
1573
1574        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1575        if (io_req->wait_for_comp) {
1576                BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1577                complete(&io_req->tm_done);
1578        }
1579}
1580
1581static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1582                           int bd_index)
1583{
1584        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1585        int frag_size, sg_frags;
1586
1587        sg_frags = 0;
1588        while (sg_len) {
1589                if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1590                        frag_size = BNX2FC_BD_SPLIT_SZ;
1591                else
1592                        frag_size = sg_len;
1593                bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1594                bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1595                bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1596                bd[bd_index + sg_frags].flags = 0;
1597
1598                addr += (u64) frag_size;
1599                sg_frags++;
1600                sg_len -= frag_size;
1601        }
1602        return sg_frags;
1603
1604}
1605
1606static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1607{
1608        struct bnx2fc_interface *interface = io_req->port->priv;
1609        struct bnx2fc_hba *hba = interface->hba;
1610        struct scsi_cmnd *sc = io_req->sc_cmd;
1611        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1612        struct scatterlist *sg;
1613        int byte_count = 0;
1614        int sg_count = 0;
1615        int bd_count = 0;
1616        int sg_frags;
1617        unsigned int sg_len;
1618        u64 addr;
1619        int i;
1620
1621        sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1622                              scsi_sg_count(sc), sc->sc_data_direction);
1623        scsi_for_each_sg(sc, sg, sg_count, i) {
1624                sg_len = sg_dma_len(sg);
1625                addr = sg_dma_address(sg);
1626                if (sg_len > BNX2FC_MAX_BD_LEN) {
1627                        sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1628                                                   bd_count);
1629                } else {
1630
1631                        sg_frags = 1;
1632                        bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1633                        bd[bd_count].buf_addr_hi  = addr >> 32;
1634                        bd[bd_count].buf_len = (u16)sg_len;
1635                        bd[bd_count].flags = 0;
1636                }
1637                bd_count += sg_frags;
1638                byte_count += sg_len;
1639        }
1640        if (byte_count != scsi_bufflen(sc))
1641                printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1642                        "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1643                        io_req->xid);
1644        return bd_count;
1645}
1646
1647static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1648{
1649        struct scsi_cmnd *sc = io_req->sc_cmd;
1650        struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1651        int bd_count;
1652
1653        if (scsi_sg_count(sc)) {
1654                bd_count = bnx2fc_map_sg(io_req);
1655                if (bd_count == 0)
1656                        return -ENOMEM;
1657        } else {
1658                bd_count = 0;
1659                bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1660                bd[0].buf_len = bd[0].flags = 0;
1661        }
1662        io_req->bd_tbl->bd_valid = bd_count;
1663
1664        return 0;
1665}
1666
1667static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1668{
1669        struct scsi_cmnd *sc = io_req->sc_cmd;
1670
1671        if (io_req->bd_tbl->bd_valid && sc) {
1672                scsi_dma_unmap(sc);
1673                io_req->bd_tbl->bd_valid = 0;
1674        }
1675}
1676
1677void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1678                                  struct fcp_cmnd *fcp_cmnd)
1679{
1680        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1681        char tag[2];
1682
1683        memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1684
1685        int_to_scsilun(sc_cmd->device->lun,
1686                        (struct scsi_lun *) fcp_cmnd->fc_lun);
1687
1688
1689        fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1690        memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1691
1692        fcp_cmnd->fc_cmdref = 0;
1693        fcp_cmnd->fc_pri_ta = 0;
1694        fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1695        fcp_cmnd->fc_flags = io_req->io_req_flags;
1696
1697        if (scsi_populate_tag_msg(sc_cmd, tag)) {
1698                switch (tag[0]) {
1699                case HEAD_OF_QUEUE_TAG:
1700                        fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1701                        break;
1702                case ORDERED_QUEUE_TAG:
1703                        fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1704                        break;
1705                default:
1706                        fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1707                        break;
1708                }
1709        } else {
1710                fcp_cmnd->fc_pri_ta = 0;
1711        }
1712}
1713
1714static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1715                                 struct fcoe_fcp_rsp_payload *fcp_rsp,
1716                                 u8 num_rq)
1717{
1718        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1719        struct bnx2fc_rport *tgt = io_req->tgt;
1720        u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1721        u32 rq_buff_len = 0;
1722        int i;
1723        unsigned char *rq_data;
1724        unsigned char *dummy;
1725        int fcp_sns_len = 0;
1726        int fcp_rsp_len = 0;
1727
1728        io_req->fcp_status = FC_GOOD;
1729        io_req->fcp_resid = fcp_rsp->fcp_resid;
1730
1731        io_req->scsi_comp_flags = rsp_flags;
1732        CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1733                                fcp_rsp->scsi_status_code;
1734
1735        /* Fetch fcp_rsp_info and fcp_sns_info if available */
1736        if (num_rq) {
1737
1738                /*
1739                 * We do not anticipate num_rq >1, as the linux defined
1740                 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1741                 * 256 bytes of single rq buffer is good enough to hold this.
1742                 */
1743
1744                if (rsp_flags &
1745                    FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1746                        fcp_rsp_len = rq_buff_len
1747                                        = fcp_rsp->fcp_rsp_len;
1748                }
1749
1750                if (rsp_flags &
1751                    FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1752                        fcp_sns_len = fcp_rsp->fcp_sns_len;
1753                        rq_buff_len += fcp_rsp->fcp_sns_len;
1754                }
1755
1756                io_req->fcp_rsp_len = fcp_rsp_len;
1757                io_req->fcp_sns_len = fcp_sns_len;
1758
1759                if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1760                        /* Invalid sense sense length. */
1761                        printk(KERN_ERR PFX "invalid sns length %d\n",
1762                                rq_buff_len);
1763                        /* reset rq_buff_len */
1764                        rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1765                }
1766
1767                rq_data = bnx2fc_get_next_rqe(tgt, 1);
1768
1769                if (num_rq > 1) {
1770                        /* We do not need extra sense data */
1771                        for (i = 1; i < num_rq; i++)
1772                                dummy = bnx2fc_get_next_rqe(tgt, 1);
1773                }
1774
1775                /* fetch fcp_rsp_code */
1776                if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1777                        /* Only for task management function */
1778                        io_req->fcp_rsp_code = rq_data[3];
1779                        printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1780                                io_req->fcp_rsp_code);
1781                }
1782
1783                /* fetch sense data */
1784                rq_data += fcp_rsp_len;
1785
1786                if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1787                        printk(KERN_ERR PFX "Truncating sense buffer\n");
1788                        fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1789                }
1790
1791                memset(sc_cmd->sense_buffer, 0, sizeof(sc_cmd->sense_buffer));
1792                if (fcp_sns_len)
1793                        memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1794
1795                /* return RQ entries */
1796                for (i = 0; i < num_rq; i++)
1797                        bnx2fc_return_rqe(tgt, 1);
1798        }
1799}
1800
1801/**
1802 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1803 *
1804 * @host:       The Scsi_Host the command was issued to
1805 * @sc_cmd:     struct scsi_cmnd to be executed
1806 *
1807 * This is the IO strategy routine, called by SCSI-ML
1808 **/
1809int bnx2fc_queuecommand(struct Scsi_Host *host,
1810                        struct scsi_cmnd *sc_cmd)
1811{
1812        struct fc_lport *lport = shost_priv(host);
1813        struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1814        struct fc_rport_libfc_priv *rp = rport->dd_data;
1815        struct bnx2fc_rport *tgt;
1816        struct bnx2fc_cmd *io_req;
1817        int rc = 0;
1818        int rval;
1819
1820        rval = fc_remote_port_chkready(rport);
1821        if (rval) {
1822                sc_cmd->result = rval;
1823                sc_cmd->scsi_done(sc_cmd);
1824                return 0;
1825        }
1826
1827        if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1828                rc = SCSI_MLQUEUE_HOST_BUSY;
1829                goto exit_qcmd;
1830        }
1831
1832        /* rport and tgt are allocated together, so tgt should be non-NULL */
1833        tgt = (struct bnx2fc_rport *)&rp[1];
1834
1835        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1836                /*
1837                 * Session is not offloaded yet. Let SCSI-ml retry
1838                 * the command.
1839                 */
1840                rc = SCSI_MLQUEUE_TARGET_BUSY;
1841                goto exit_qcmd;
1842        }
1843
1844        io_req = bnx2fc_cmd_alloc(tgt);
1845        if (!io_req) {
1846                rc = SCSI_MLQUEUE_HOST_BUSY;
1847                goto exit_qcmd;
1848        }
1849        io_req->sc_cmd = sc_cmd;
1850
1851        if (bnx2fc_post_io_req(tgt, io_req)) {
1852                printk(KERN_ERR PFX "Unable to post io_req\n");
1853                rc = SCSI_MLQUEUE_HOST_BUSY;
1854                goto exit_qcmd;
1855        }
1856exit_qcmd:
1857        return rc;
1858}
1859
1860void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1861                                   struct fcoe_task_ctx_entry *task,
1862                                   u8 num_rq)
1863{
1864        struct fcoe_fcp_rsp_payload *fcp_rsp;
1865        struct bnx2fc_rport *tgt = io_req->tgt;
1866        struct scsi_cmnd *sc_cmd;
1867        struct Scsi_Host *host;
1868
1869
1870        /* scsi_cmd_cmpl is called with tgt lock held */
1871
1872        if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1873                /* we will not receive ABTS response for this IO */
1874                BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1875                           "this scsi cmd\n");
1876        }
1877
1878        /* Cancel the timeout_work, as we received IO completion */
1879        if (cancel_delayed_work(&io_req->timeout_work))
1880                kref_put(&io_req->refcount,
1881                         bnx2fc_cmd_release); /* drop timer hold */
1882
1883        sc_cmd = io_req->sc_cmd;
1884        if (sc_cmd == NULL) {
1885                printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1886                return;
1887        }
1888
1889        /* Fetch fcp_rsp from task context and perform cmd completion */
1890        fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1891                   &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1892
1893        /* parse fcp_rsp and obtain sense data from RQ if available */
1894        bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1895
1896        host = sc_cmd->device->host;
1897        if (!sc_cmd->SCp.ptr) {
1898                printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1899                return;
1900        }
1901
1902        if (io_req->on_active_queue) {
1903                list_del_init(&io_req->link);
1904                io_req->on_active_queue = 0;
1905                /* Move IO req to retire queue */
1906                list_add_tail(&io_req->link, &tgt->io_retire_queue);
1907        } else {
1908                /* This should not happen, but could have been pulled
1909                 * by bnx2fc_flush_active_ios(), or during a race
1910                 * between command abort and (late) completion.
1911                 */
1912                BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1913                if (io_req->wait_for_comp)
1914                        if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1915                                               &io_req->req_flags))
1916                                complete(&io_req->tm_done);
1917        }
1918
1919        bnx2fc_unmap_sg_list(io_req);
1920        io_req->sc_cmd = NULL;
1921
1922        switch (io_req->fcp_status) {
1923        case FC_GOOD:
1924                if (io_req->cdb_status == 0) {
1925                        /* Good IO completion */
1926                        sc_cmd->result = DID_OK << 16;
1927                } else {
1928                        /* Transport status is good, SCSI status not good */
1929                        BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1930                                 " fcp_resid = 0x%x\n",
1931                                io_req->cdb_status, io_req->fcp_resid);
1932                        sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1933                }
1934                if (io_req->fcp_resid)
1935                        scsi_set_resid(sc_cmd, io_req->fcp_resid);
1936                break;
1937        default:
1938                printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1939                        io_req->fcp_status);
1940                break;
1941        }
1942        sc_cmd->SCp.ptr = NULL;
1943        sc_cmd->scsi_done(sc_cmd);
1944        kref_put(&io_req->refcount, bnx2fc_cmd_release);
1945}
1946
1947int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1948                               struct bnx2fc_cmd *io_req)
1949{
1950        struct fcoe_task_ctx_entry *task;
1951        struct fcoe_task_ctx_entry *task_page;
1952        struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1953        struct fcoe_port *port = tgt->port;
1954        struct bnx2fc_interface *interface = port->priv;
1955        struct bnx2fc_hba *hba = interface->hba;
1956        struct fc_lport *lport = port->lport;
1957        struct fcoe_dev_stats *stats;
1958        int task_idx, index;
1959        u16 xid;
1960
1961        /* Initialize rest of io_req fields */
1962        io_req->cmd_type = BNX2FC_SCSI_CMD;
1963        io_req->port = port;
1964        io_req->tgt = tgt;
1965        io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1966        sc_cmd->SCp.ptr = (char *)io_req;
1967
1968        stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1969        if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1970                io_req->io_req_flags = BNX2FC_READ;
1971                stats->InputRequests++;
1972                stats->InputBytes += io_req->data_xfer_len;
1973        } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1974                io_req->io_req_flags = BNX2FC_WRITE;
1975                stats->OutputRequests++;
1976                stats->OutputBytes += io_req->data_xfer_len;
1977        } else {
1978                io_req->io_req_flags = 0;
1979                stats->ControlRequests++;
1980        }
1981        put_cpu();
1982
1983        xid = io_req->xid;
1984
1985        /* Build buffer descriptor list for firmware from sg list */
1986        if (bnx2fc_build_bd_list_from_sg(io_req)) {
1987                printk(KERN_ERR PFX "BD list creation failed\n");
1988                spin_lock_bh(&tgt->tgt_lock);
1989                kref_put(&io_req->refcount, bnx2fc_cmd_release);
1990                spin_unlock_bh(&tgt->tgt_lock);
1991                return -EAGAIN;
1992        }
1993
1994        task_idx = xid / BNX2FC_TASKS_PER_PAGE;
1995        index = xid % BNX2FC_TASKS_PER_PAGE;
1996
1997        /* Initialize task context for this IO request */
1998        task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
1999        task = &(task_page[index]);
2000        bnx2fc_init_task(io_req, task);

2001
2002        spin_lock_bh(&tgt->tgt_lock);
2003
2004        if (tgt->flush_in_prog) {
2005                printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2006                kref_put(&io_req->refcount, bnx2fc_cmd_release);
2007                spin_unlock_bh(&tgt->tgt_lock);
2008                return -EAGAIN;
2009        }
2010
2011        if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2012                printk(KERN_ERR PFX "Session not ready...post_io\n");
2013                kref_put(&io_req->refcount, bnx2fc_cmd_release);
2014                spin_unlock_bh(&tgt->tgt_lock);
2015                return -EAGAIN;
2016        }
2017
2018        /* Time IO req */
2019        if (tgt->io_timeout)
2020                bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2021        /* Obtain free SQ entry */
2022        bnx2fc_add_2_sq(tgt, xid);
2023
2024        /* Enqueue the io_req to active_cmd_queue */
2025
2026        io_req->on_active_queue = 1;
2027        /* move io_req from pending_queue to active_queue */
2028        list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2029
2030        /* Ring doorbell */
2031        bnx2fc_ring_doorbell(tgt);
2032        spin_unlock_bh(&tgt->tgt_lock);
2033        return 0;
2034}
2035