drivers/scsi/fnic/fnic_scsi.c

   1 /*
   2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  */
  18 #include <linux/mempool.h>
  19 #include <linux/errno.h>
  20 #include <linux/init.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/pci.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/delay.h>
  29 #include <linux/gfp.h>
  30 #include <scsi/scsi.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_cmnd.h>
  34 #include <scsi/scsi_tcq.h>
  35 #include <scsi/fc/fc_els.h>
  36 #include <scsi/fc/fc_fcoe.h>
  37 #include <scsi/libfc.h>
  38 #include <scsi/fc_frame.h>
  39 #include "fnic_io.h"
  40 #include "fnic.h"
  41
  42 const char *fnic_state_str[] = {
  43         [FNIC_IN_FC_MODE] =           "FNIC_IN_FC_MODE",
  44         [FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE",
  45         [FNIC_IN_ETH_MODE] =          "FNIC_IN_ETH_MODE",
  46         [FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE",
  47 };
  48
  49 static const char *fnic_ioreq_state_str[] = {
  50         [FNIC_IOREQ_NOT_INITED] = "FNIC_IOREQ_NOT_INITED",
  51         [FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING",
  52         [FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING",
  53         [FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE",
  54         [FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE",
  55 };
  56
  57 static const char *fcpio_status_str[] =  {
  58         [FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/
  59         [FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER",
  60         [FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE",
  61         [FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]",
  62         [FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED",
  63         [FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND",
  64         [FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/
  65         [FCPIO_TIMEOUT] = "FCPIO_TIMEOUT",
  66         [FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID",
  67         [FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID",
  68         [FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH",
  69         [FCPIO_FW_ERR] = "FCPIO_FW_ERR",
  70         [FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED",
  71         [FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED",
  72         [FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN",
  73         [FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED",
  74         [FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL",
  75         [FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED",
  76         [FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND",
  77 };
  78
  79 const char *fnic_state_to_str(unsigned int state)
  80 {
  81         if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state])
  82                 return "unknown";
  83
  84         return fnic_state_str[state];
  85 }
  86
  87 static const char *fnic_ioreq_state_to_str(unsigned int state)
  88 {
  89         if (state >= ARRAY_SIZE(fnic_ioreq_state_str) ||
  90             !fnic_ioreq_state_str[state])
  91                 return "unknown";
  92
  93         return fnic_ioreq_state_str[state];
  94 }
  95
  96 static const char *fnic_fcpio_status_to_str(unsigned int status)
  97 {
  98         if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status])
  99                 return "unknown";
 100
 101         return fcpio_status_str[status];
 102 }
 103
 104 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id);
 105
 106 static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
 107                                             struct scsi_cmnd *sc)
 108 {
 109         u32 hash = sc->request->tag & (FNIC_IO_LOCKS - 1);
 110
 111         return &fnic->io_req_lock[hash];
 112 }
 113
 114 static inline spinlock_t *fnic_io_lock_tag(struct fnic *fnic,
 115                                             int tag)
 116 {
 117         return &fnic->io_req_lock[tag & (FNIC_IO_LOCKS - 1)];
 118 }
 119
 120 /*
 121  * Unmap the data buffer and sense buffer for an io_req,
 122  * also unmap and free the device-private scatter/gather list.
 123  */
 124 static void fnic_release_ioreq_buf(struct fnic *fnic,
 125                                    struct fnic_io_req *io_req,
 126                                    struct scsi_cmnd *sc)
 127 {
 128         if (io_req->sgl_list_pa)
 129                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 130                                  sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
 131                                  DMA_TO_DEVICE);
 132         scsi_dma_unmap(sc);
 133
 134         if (io_req->sgl_cnt)
 135                 mempool_free(io_req->sgl_list_alloc,
 136                              fnic->io_sgl_pool[io_req->sgl_type]);
 137         if (io_req->sense_buf_pa)
 138                 dma_unmap_single(&fnic->pdev->dev, io_req->sense_buf_pa,
 139                                  SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 140 }
 141
 142 /* Free up Copy Wq descriptors. Called with copy_wq lock held */
 143 static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
 144 {
 145         /* if no Ack received from firmware, then nothing to clean */
 146         if (!fnic->fw_ack_recd[0])
 147                 return 1;
 148
 149         /*
 150          * Update desc_available count based on number of freed descriptors
 151          * Account for wraparound
 152          */
 153         if (wq->to_clean_index <= fnic->fw_ack_index[0])
 154                 wq->ring.desc_avail += (fnic->fw_ack_index[0]
 155                                         - wq->to_clean_index + 1);
 156         else
 157                 wq->ring.desc_avail += (wq->ring.desc_count
 158                                         - wq->to_clean_index
 159                                         + fnic->fw_ack_index[0] + 1);
 160
 161         /*
 162          * just bump clean index to ack_index+1 accounting for wraparound
 163          * this will essentially free up all descriptors between
 164          * to_clean_index and fw_ack_index, both inclusive
 165          */
 166         wq->to_clean_index =
 167                 (fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;
 168
 169         /* we have processed the acks received so far */
 170         fnic->fw_ack_recd[0] = 0;
 171         return 0;
 172 }
 173
 174
 175 /**
 176  * __fnic_set_state_flags
 177  * Sets/Clears bits in fnic's state_flags
 178  **/
 179 void
 180 __fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags,
 181                         unsigned long clearbits)
 182 {
 183         unsigned long flags = 0;
 184         unsigned long host_lock_flags = 0;
 185
 186         spin_lock_irqsave(&fnic->fnic_lock, flags);
 187         spin_lock_irqsave(fnic->lport->host->host_lock, host_lock_flags);
 188
 189         if (clearbits)
 190                 fnic->state_flags &= ~st_flags;
 191         else
 192                 fnic->state_flags |= st_flags;
 193
 194         spin_unlock_irqrestore(fnic->lport->host->host_lock, host_lock_flags);
 195         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 196
 197         return;
 198 }
 199
 200
 201 /*
 202  * fnic_fw_reset_handler
 203  * Routine to send reset msg to fw
 204  */
 205 int fnic_fw_reset_handler(struct fnic *fnic)
 206 {
 207         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 208         int ret = 0;
 209         unsigned long flags;
 210
 211         /* indicate fwreset to io path */
 212         fnic_set_state_flags(fnic, FNIC_FLAGS_FWRESET);
 213
 214         skb_queue_purge(&fnic->frame_queue);
 215         skb_queue_purge(&fnic->tx_queue);
 216
 217         /* wait for io cmpl */
 218         while (atomic_read(&fnic->in_flight))
 219                 schedule_timeout(msecs_to_jiffies(1));
 220
 221         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 222
 223         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 224                 free_wq_copy_descs(fnic, wq);
 225
 226         if (!vnic_wq_copy_desc_avail(wq))
 227                 ret = -EAGAIN;
 228         else {
 229                 fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG);
 230                 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 231                 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 232                           atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 233                         atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 234                                 atomic64_read(
 235                                   &fnic->fnic_stats.fw_stats.active_fw_reqs));
 236         }
 237
 238         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 239
 240         if (!ret) {
 241                 atomic64_inc(&fnic->fnic_stats.reset_stats.fw_resets);
 242                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 243                               "Issued fw reset\n");
 244         } else {
 245                 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 246                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 247                               "Failed to issue fw reset\n");
 248         }
 249
 250         return ret;
 251 }
 252
 253
 254 /*
 255  * fnic_flogi_reg_handler
 256  * Routine to send flogi register msg to fw
 257  */
 258 int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id)
 259 {
 260         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 261         enum fcpio_flogi_reg_format_type format;
 262         struct fc_lport *lp = fnic->lport;
 263         u8 gw_mac[ETH_ALEN];
 264         int ret = 0;
 265         unsigned long flags;
 266
 267         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 268
 269         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 270                 free_wq_copy_descs(fnic, wq);
 271
 272         if (!vnic_wq_copy_desc_avail(wq)) {
 273                 ret = -EAGAIN;
 274                 goto flogi_reg_ioreq_end;
 275         }
 276
 277         if (fnic->ctlr.map_dest) {
 278                 memset(gw_mac, 0xff, ETH_ALEN);
 279                 format = FCPIO_FLOGI_REG_DEF_DEST;
 280         } else {
 281                 memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN);
 282                 format = FCPIO_FLOGI_REG_GW_DEST;
 283         }
 284
 285         if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) {
 286                 fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG,
 287                                                 fc_id, gw_mac,
 288                                                 fnic->data_src_addr,
 289                                                 lp->r_a_tov, lp->e_d_tov);
 290                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 291                               "FLOGI FIP reg issued fcid %x src %pM dest %pM\n",
 292                               fc_id, fnic->data_src_addr, gw_mac);
 293         } else {
 294                 fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG,
 295                                                   format, fc_id, gw_mac);
 296                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 297                               "FLOGI reg issued fcid %x map %d dest %pM\n",
 298                               fc_id, fnic->ctlr.map_dest, gw_mac);
 299         }
 300
 301         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 302         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 303                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 304                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 305                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 306
 307 flogi_reg_ioreq_end:
 308         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 309         return ret;
 310 }
 311
 312 /*
 313  * fnic_queue_wq_copy_desc
 314  * Routine to enqueue a wq copy desc
 315  */
 316 static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
 317                                           struct vnic_wq_copy *wq,
 318                                           struct fnic_io_req *io_req,
 319                                           struct scsi_cmnd *sc,
 320                                           int sg_count)
 321 {
 322         struct scatterlist *sg;
 323         struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
 324         struct fc_rport_libfc_priv *rp = rport->dd_data;
 325         struct host_sg_desc *desc;
 326         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
 327         unsigned int i;
 328         unsigned long intr_flags;
 329         int flags;
 330         u8 exch_flags;
 331         struct scsi_lun fc_lun;
 332
 333         if (sg_count) {
 334                 /* For each SGE, create a device desc entry */
 335                 desc = io_req->sgl_list;
 336                 for_each_sg(scsi_sglist(sc), sg, sg_count, i) {
 337                         desc->addr = cpu_to_le64(sg_dma_address(sg));
 338                         desc->len = cpu_to_le32(sg_dma_len(sg));
 339                         desc->_resvd = 0;
 340                         desc++;
 341                 }
 342
 343                 io_req->sgl_list_pa = dma_map_single(&fnic->pdev->dev,
 344                                 io_req->sgl_list,
 345                                 sizeof(io_req->sgl_list[0]) * sg_count,
 346                                 DMA_TO_DEVICE);
 347                 if (dma_mapping_error(&fnic->pdev->dev, io_req->sgl_list_pa)) {
 348                         printk(KERN_ERR "DMA mapping failed\n");
 349                         return SCSI_MLQUEUE_HOST_BUSY;
 350                 }
 351         }
 352
 353         io_req->sense_buf_pa = dma_map_single(&fnic->pdev->dev,
 354                                               sc->sense_buffer,
 355                                               SCSI_SENSE_BUFFERSIZE,
 356                                               DMA_FROM_DEVICE);
 357         if (dma_mapping_error(&fnic->pdev->dev, io_req->sense_buf_pa)) {
 358                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 359                                 sizeof(io_req->sgl_list[0]) * sg_count,
 360                                 DMA_TO_DEVICE);
 361                 printk(KERN_ERR "DMA mapping failed\n");
 362                 return SCSI_MLQUEUE_HOST_BUSY;
 363         }
 364
 365         int_to_scsilun(sc->device->lun, &fc_lun);
 366
 367         /* Enqueue the descriptor in the Copy WQ */
 368         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
 369
 370         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 371                 free_wq_copy_descs(fnic, wq);
 372
 373         if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
 374                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 375                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 376                           "fnic_queue_wq_copy_desc failure - no descriptors\n");
 377                 atomic64_inc(&misc_stats->io_cpwq_alloc_failures);
 378                 return SCSI_MLQUEUE_HOST_BUSY;
 379         }
 380
 381         flags = 0;
 382         if (sc->sc_data_direction == DMA_FROM_DEVICE)
 383                 flags = FCPIO_ICMND_RDDATA;
 384         else if (sc->sc_data_direction == DMA_TO_DEVICE)
 385                 flags = FCPIO_ICMND_WRDATA;
 386
 387         exch_flags = 0;
 388         if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
 389             (rp->flags & FC_RP_FLAGS_RETRY))
 390                 exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;
 391
 392         fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag,
 393                                          0, exch_flags, io_req->sgl_cnt,
 394                                          SCSI_SENSE_BUFFERSIZE,
 395                                          io_req->sgl_list_pa,
 396                                          io_req->sense_buf_pa,
 397                                          0, /* scsi cmd ref, always 0 */
 398                                          FCPIO_ICMND_PTA_SIMPLE,
 399                                                 /* scsi pri and tag */
 400                                          flags, /* command flags */
 401                                          sc->cmnd, sc->cmd_len,
 402                                          scsi_bufflen(sc),
 403                                          fc_lun.scsi_lun, io_req->port_id,
 404                                          rport->maxframe_size, rp->r_a_tov,
 405                                          rp->e_d_tov);
 406
 407         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 408         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 409                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 410                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 411                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 412
 413         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 414         return 0;
 415 }
 416
 417 /*
 418  * fnic_queuecommand
 419  * Routine to send a scsi cdb
 420  * Called with host_lock held and interrupts disabled.
 421  */
 422 static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 423 {
 424         struct fc_lport *lp = shost_priv(sc->device->host);
 425         struct fc_rport *rport;
 426         struct fnic_io_req *io_req = NULL;
 427         struct fnic *fnic = lport_priv(lp);
 428         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 429         struct vnic_wq_copy *wq;
 430         int ret;
 431         u64 cmd_trace;
 432         int sg_count = 0;
 433         unsigned long flags = 0;
 434         unsigned long ptr;
 435         spinlock_t *io_lock = NULL;
 436         int io_lock_acquired = 0;
 437         struct fc_rport_libfc_priv *rp;
 438
 439         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
 440                 return SCSI_MLQUEUE_HOST_BUSY;
 441
 442         rport = starget_to_rport(scsi_target(sc->device));
 443         if (!rport) {
 444                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 445                                 "returning DID_NO_CONNECT for IO as rport is NULL\n");
 446                 sc->result = DID_NO_CONNECT << 16;
 447                 done(sc);
 448                 return 0;
 449         }
 450
 451         ret = fc_remote_port_chkready(rport);
 452         if (ret) {
 453                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 454                                 "rport is not ready\n");
 455                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 456                 sc->result = ret;
 457                 done(sc);
 458                 return 0;
 459         }
 460
 461         rp = rport->dd_data;
 462         if (!rp || rp->rp_state == RPORT_ST_DELETE) {
 463                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 464                         "rport 0x%x removed, returning DID_NO_CONNECT\n",
 465                         rport->port_id);
 466
 467                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 468                 sc->result = DID_NO_CONNECT<<16;
 469                 done(sc);
 470                 return 0;
 471         }
 472
 473         if (rp->rp_state != RPORT_ST_READY) {
 474                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 475                         "rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
 476                         rport->port_id, rp->rp_state);
 477
 478                 sc->result = DID_IMM_RETRY << 16;
 479                 done(sc);
 480                 return 0;
 481         }
 482
 483         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 484                 return SCSI_MLQUEUE_HOST_BUSY;
 485
 486         atomic_inc(&fnic->in_flight);
 487
 488         /*
 489          * Release host lock, use driver resource specific locks from here.
 490          * Don't re-enable interrupts in case they were disabled prior to the
 491          * caller disabling them.
 492          */
 493         spin_unlock(lp->host->host_lock);
 494         CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
 495         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
 496
 497         /* Get a new io_req for this SCSI IO */
 498         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 499         if (!io_req) {
 500                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 501                 ret = SCSI_MLQUEUE_HOST_BUSY;
 502                 goto out;
 503         }
 504         memset(io_req, 0, sizeof(*io_req));
 505
 506         /* Map the data buffer */
 507         sg_count = scsi_dma_map(sc);
 508         if (sg_count < 0) {
 509                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 510                           sc->request->tag, sc, 0, sc->cmnd[0],
 511                           sg_count, CMD_STATE(sc));
 512                 mempool_free(io_req, fnic->io_req_pool);
 513                 goto out;
 514         }
 515
 516         /* Determine the type of scatter/gather list we need */
 517         io_req->sgl_cnt = sg_count;
 518         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 519         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 520                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 521
 522         if (sg_count) {
 523                 io_req->sgl_list =
 524                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 525                                       GFP_ATOMIC);
 526                 if (!io_req->sgl_list) {
 527                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 528                         ret = SCSI_MLQUEUE_HOST_BUSY;
 529                         scsi_dma_unmap(sc);
 530                         mempool_free(io_req, fnic->io_req_pool);
 531                         goto out;
 532                 }
 533
 534                 /* Cache sgl list allocated address before alignment */
 535                 io_req->sgl_list_alloc = io_req->sgl_list;
 536                 ptr = (unsigned long) io_req->sgl_list;
 537                 if (ptr % FNIC_SG_DESC_ALIGN) {
 538                         io_req->sgl_list = (struct host_sg_desc *)
 539                                 (((unsigned long) ptr
 540                                   + FNIC_SG_DESC_ALIGN - 1)
 541                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 542                 }
 543         }
 544
 545         /*
 546         * Will acquire lock defore setting to IO initialized.
 547         */
 548
 549         io_lock = fnic_io_lock_hash(fnic, sc);
 550         spin_lock_irqsave(io_lock, flags);
 551
 552         /* initialize rest of io_req */
 553         io_lock_acquired = 1;
 554         io_req->port_id = rport->port_id;
 555         io_req->start_time = jiffies;
 556         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
 557         CMD_SP(sc) = (char *)io_req;
 558         CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
 559         sc->scsi_done = done;
 560
 561         /* create copy wq desc and enqueue it */
 562         wq = &fnic->wq_copy[0];
 563         ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
 564         if (ret) {
 565                 /*
 566                  * In case another thread cancelled the request,
 567                  * refetch the pointer under the lock.
 568                  */
 569                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 570                           sc->request->tag, sc, 0, 0, 0,
 571                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
 572                 io_req = (struct fnic_io_req *)CMD_SP(sc);
 573                 CMD_SP(sc) = NULL;
 574                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 575                 spin_unlock_irqrestore(io_lock, flags);
 576                 if (io_req) {
 577                         fnic_release_ioreq_buf(fnic, io_req, sc);
 578                         mempool_free(io_req, fnic->io_req_pool);
 579                 }
 580                 atomic_dec(&fnic->in_flight);
 581                 /* acquire host lock before returning to SCSI */
 582                 spin_lock(lp->host->host_lock);
 583                 return ret;
 584         } else {
 585                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 586                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 587                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 588                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 589                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 590                              atomic64_read(&fnic_stats->io_stats.active_ios));
 591
 592                 /* REVISIT: Use per IO lock in the final code */
 593                 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
 594         }
 595 out:
 596         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 597                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 598                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 599                         sc->cmnd[5]);
 600
 601         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 602                   sc->request->tag, sc, io_req,
 603                   sg_count, cmd_trace,
 604                   (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
 605
 606         /* if only we issued IO, will we have the io lock */
 607         if (io_lock_acquired)
 608                 spin_unlock_irqrestore(io_lock, flags);
 609
 610         atomic_dec(&fnic->in_flight);
 611         /* acquire host lock before returning to SCSI */
 612         spin_lock(lp->host->host_lock);
 613         return ret;
 614 }
 615
 616 DEF_SCSI_QCMD(fnic_queuecommand)
 617
 618 /*
 619  * fnic_fcpio_fw_reset_cmpl_handler
 620  * Routine to handle fw reset completion
 621  */
 622 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 623                                             struct fcpio_fw_req *desc)
 624 {
 625         u8 type;
 626         u8 hdr_status;
 627         struct fcpio_tag tag;
 628         int ret = 0;
 629         unsigned long flags;
 630         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 631
 632         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 633
 634         atomic64_inc(&reset_stats->fw_reset_completions);
 635
 636         /* Clean up all outstanding io requests */
 637         fnic_cleanup_io(fnic, SCSI_NO_TAG);
 638
 639         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 640         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 641         atomic64_set(&fnic->io_cmpl_skip, 0);
 642
 643         spin_lock_irqsave(&fnic->fnic_lock, flags);
 644
 645         /* fnic should be in FC_TRANS_ETH_MODE */
 646         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 647                 /* Check status of reset completion */
 648                 if (!hdr_status) {
 649                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 650                                       "reset cmpl success\n");
 651                         /* Ready to send flogi out */
 652                         fnic->state = FNIC_IN_ETH_MODE;
 653                 } else {
 654                         FNIC_SCSI_DBG(KERN_DEBUG,
 655                                       fnic->lport->host,
 656                                       "fnic fw_reset : failed %s\n",
 657                                       fnic_fcpio_status_to_str(hdr_status));
 658
 659                         /*
 660                          * Unable to change to eth mode, cannot send out flogi
 661                          * Change state to fc mode, so that subsequent Flogi
 662                          * requests from libFC will cause more attempts to
 663                          * reset the firmware. Free the cached flogi
 664                          */
 665                         fnic->state = FNIC_IN_FC_MODE;
 666                         atomic64_inc(&reset_stats->fw_reset_failures);
 667                         ret = -1;
 668                 }
 669         } else {
 670                 FNIC_SCSI_DBG(KERN_DEBUG,
 671                               fnic->lport->host,
 672                               "Unexpected state %s while processing"
 673                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 674                 atomic64_inc(&reset_stats->fw_reset_failures);
 675                 ret = -1;
 676         }
 677
 678         /* Thread removing device blocks till firmware reset is complete */
 679         if (fnic->remove_wait)
 680                 complete(fnic->remove_wait);
 681
 682         /*
 683          * If fnic is being removed, or fw reset failed
 684          * free the flogi frame. Else, send it out
 685          */
 686         if (fnic->remove_wait || ret) {
 687                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 688                 skb_queue_purge(&fnic->tx_queue);
 689                 goto reset_cmpl_handler_end;
 690         }
 691
 692         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 693
 694         fnic_flush_tx(fnic);
 695
 696  reset_cmpl_handler_end:
 697         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 698
 699         return ret;
 700 }
 701
 702 /*
 703  * fnic_fcpio_flogi_reg_cmpl_handler
 704  * Routine to handle flogi register completion
 705  */
 706 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 707                                              struct fcpio_fw_req *desc)
 708 {
 709         u8 type;
 710         u8 hdr_status;
 711         struct fcpio_tag tag;
 712         int ret = 0;
 713         unsigned long flags;
 714
 715         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 716
 717         /* Update fnic state based on status of flogi reg completion */
 718         spin_lock_irqsave(&fnic->fnic_lock, flags);
 719
 720         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 721
 722                 /* Check flogi registration completion status */
 723                 if (!hdr_status) {
 724                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 725                                       "flog reg succeeded\n");
 726                         fnic->state = FNIC_IN_FC_MODE;
 727                 } else {
 728                         FNIC_SCSI_DBG(KERN_DEBUG,
 729                                       fnic->lport->host,
 730                                       "fnic flogi reg :failed %s\n",
 731                                       fnic_fcpio_status_to_str(hdr_status));
 732                         fnic->state = FNIC_IN_ETH_MODE;
 733                         ret = -1;
 734                 }
 735         } else {
 736                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 737                               "Unexpected fnic state %s while"
 738                               " processing flogi reg completion\n",
 739                               fnic_state_to_str(fnic->state));
 740                 ret = -1;
 741         }
 742
 743         if (!ret) {
 744                 if (fnic->stop_rx_link_events) {
 745                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 746                         goto reg_cmpl_handler_end;
 747                 }
 748                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 749
 750                 fnic_flush_tx(fnic);
 751                 queue_work(fnic_event_queue, &fnic->frame_work);
 752         } else {
 753                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 754         }
 755
 756 reg_cmpl_handler_end:
 757         return ret;
 758 }
 759
 760 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 761                                         u16 request_out)
 762 {
 763         if (wq->to_clean_index <= wq->to_use_index) {
 764                 /* out of range, stale request_out index */
 765                 if (request_out < wq->to_clean_index ||
 766                     request_out >= wq->to_use_index)
 767                         return 0;
 768         } else {
 769                 /* out of range, stale request_out index */
 770                 if (request_out < wq->to_clean_index &&
 771                     request_out >= wq->to_use_index)
 772                         return 0;
 773         }
 774         /* request_out index is in range */
 775         return 1;
 776 }
 777
 778
 779 /*
 780  * Mark that ack received and store the Ack index. If there are multiple
 781  * acks received before Tx thread cleans it up, the latest value will be
 782  * used which is correct behavior. This state should be in the copy Wq
 783  * instead of in the fnic
 784  */
 785 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 786                                           unsigned int cq_index,
 787                                           struct fcpio_fw_req *desc)
 788 {
 789         struct vnic_wq_copy *wq;
 790         u16 request_out = desc->u.ack.request_out;
 791         unsigned long flags;
 792         u64 *ox_id_tag = (u64 *)(void *)desc;
 793
 794         /* mark the ack state */
 795         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 796         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 797
 798         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 799         if (is_ack_index_in_range(wq, request_out)) {
 800                 fnic->fw_ack_index[0] = request_out;
 801                 fnic->fw_ack_recd[0] = 1;
 802         } else
 803                 atomic64_inc(
 804                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 805
 806         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 807         FNIC_TRACE(fnic_fcpio_ack_handler,
 808                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 809                   ox_id_tag[4], ox_id_tag[5]);
 810 }
 811
 812 /*
 813  * fnic_fcpio_icmnd_cmpl_handler
 814  * Routine to handle icmnd completions
 815  */
 816 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 817                                          struct fcpio_fw_req *desc)
 818 {
 819         u8 type;
 820         u8 hdr_status;
 821         struct fcpio_tag tag;
 822         u32 id;
 823         u64 xfer_len = 0;
 824         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 825         struct fnic_io_req *io_req;
 826         struct scsi_cmnd *sc;
 827         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 828         unsigned long flags;
 829         spinlock_t *io_lock;
 830         u64 cmd_trace;
 831         unsigned long start_time;
 832         unsigned long io_duration_time;
 833
 834         /* Decode the cmpl description to get the io_req id */
 835         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 836         fcpio_tag_id_dec(&tag, &id);
 837         icmnd_cmpl = &desc->u.icmnd_cmpl;
 838
 839         if (id >= fnic->fnic_max_tag_id) {
 840                 shost_printk(KERN_ERR, fnic->lport->host,
 841                         "Tag out of range tag %x hdr status = %s\n",
 842                              id, fnic_fcpio_status_to_str(hdr_status));
 843                 return;
 844         }
 845
 846         sc = scsi_host_find_tag(fnic->lport->host, id);
 847         WARN_ON_ONCE(!sc);
 848         if (!sc) {
 849                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 850                 shost_printk(KERN_ERR, fnic->lport->host,
 851                           "icmnd_cmpl sc is null - "
 852                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 853                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 854                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 855                           fnic->lport->host->host_no, id,
 856                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 857                           (u64)icmnd_cmpl->_resvd0[0]),
 858                           ((u64)hdr_status << 16 |
 859                           (u64)icmnd_cmpl->scsi_status << 8 |
 860                           (u64)icmnd_cmpl->flags), desc,
 861                           (u64)icmnd_cmpl->residual, 0);
 862                 return;
 863         }
 864
 865         io_lock = fnic_io_lock_hash(fnic, sc);
 866         spin_lock_irqsave(io_lock, flags);
 867         io_req = (struct fnic_io_req *)CMD_SP(sc);
 868         WARN_ON_ONCE(!io_req);
 869         if (!io_req) {
 870                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 871                 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
 872                 spin_unlock_irqrestore(io_lock, flags);
 873                 shost_printk(KERN_ERR, fnic->lport->host,
 874                           "icmnd_cmpl io_req is null - "
 875                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 876                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 877                 return;
 878         }
 879         start_time = io_req->start_time;
 880
 881         /* firmware completed the io */
 882         io_req->io_completed = 1;
 883
 884         /*
 885          *  if SCSI-ML has already issued abort on this command,
 886          *  set completion of the IO. The abts path will clean it up
 887          */
 888         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
 889
 890                 /*
 891                  * set the FNIC_IO_DONE so that this doesn't get
 892                  * flagged as 'out of order' if it was not aborted
 893                  */
 894                 CMD_FLAGS(sc) |= FNIC_IO_DONE;
 895                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
 896                 spin_unlock_irqrestore(io_lock, flags);
 897                 if(FCPIO_ABORTED == hdr_status)
 898                         CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
 899
 900                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 901                         "icmnd_cmpl abts pending "
 902                           "hdr status = %s tag = 0x%x sc = 0x%p "
 903                           "scsi_status = %x residual = %d\n",
 904                           fnic_fcpio_status_to_str(hdr_status),
 905                           id, sc,
 906                           icmnd_cmpl->scsi_status,
 907                           icmnd_cmpl->residual);
 908                 return;
 909         }
 910
 911         /* Mark the IO as complete */
 912         CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 913
 914         icmnd_cmpl = &desc->u.icmnd_cmpl;
 915
 916         switch (hdr_status) {
 917         case FCPIO_SUCCESS:
 918                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 919                 xfer_len = scsi_bufflen(sc);
 920                 scsi_set_resid(sc, icmnd_cmpl->residual);
 921
 922                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
 923                         xfer_len -= icmnd_cmpl->residual;
 924
 925                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 926                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 927
 928                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 929                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 930                 break;
 931
 932         case FCPIO_TIMEOUT:          /* request was timed out */
 933                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 934                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 935                 break;
 936
 937         case FCPIO_ABORTED:          /* request was aborted */
 938                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 939                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 940                 break;
 941
 942         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 943                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 944                 scsi_set_resid(sc, icmnd_cmpl->residual);
 945                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 946                 break;
 947
 948         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 949                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 950                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 951                 break;
 952
 953         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 954                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 955                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 956                 break;
 957
 958         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 959                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 960                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 961                 break;
 962
 963         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 964                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 965                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 966                 break;
 967
 968         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 969                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 970                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 971                 break;
 972
 973         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 974         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 975         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 976         default:
 977                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 978                 break;
 979         }
 980
 981         /* Break link with the SCSI command */
 982         CMD_SP(sc) = NULL;
 983         CMD_FLAGS(sc) |= FNIC_IO_DONE;
 984
 985         spin_unlock_irqrestore(io_lock, flags);
 986
 987         if (hdr_status != FCPIO_SUCCESS) {
 988                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 989                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
 990                              fnic_fcpio_status_to_str(hdr_status));
 991         }
 992
 993         fnic_release_ioreq_buf(fnic, io_req, sc);
 994
 995         mempool_free(io_req, fnic->io_req_pool);
 996
 997         cmd_trace = ((u64)hdr_status << 56) |
 998                   (u64)icmnd_cmpl->scsi_status << 48 |
 999                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
1000                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1001                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
1002
1003         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
1004                   sc->device->host->host_no, id, sc,
1005                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
1006                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
1007                   jiffies_to_msecs(jiffies - start_time)),
1008                   desc, cmd_trace,
1009                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1010
1011         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
1012                 fnic->lport->host_stats.fcp_input_requests++;
1013                 fnic->fcp_input_bytes += xfer_len;
1014         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1015                 fnic->lport->host_stats.fcp_output_requests++;
1016                 fnic->fcp_output_bytes += xfer_len;
1017         } else
1018                 fnic->lport->host_stats.fcp_control_requests++;
1019
1020         atomic64_dec(&fnic_stats->io_stats.active_ios);
1021         if (atomic64_read(&fnic->io_cmpl_skip))
1022                 atomic64_dec(&fnic->io_cmpl_skip);
1023         else
1024                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1025
1026
1027         io_duration_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1028
1029         if(io_duration_time <= 10)
1030                 atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);
1031         else if(io_duration_time <= 100)
1032                 atomic64_inc(&fnic_stats->io_stats.io_btw_10_to_100_msec);
1033         else if(io_duration_time <= 500)
1034                 atomic64_inc(&fnic_stats->io_stats.io_btw_100_to_500_msec);
1035         else if(io_duration_time <= 5000)
1036                 atomic64_inc(&fnic_stats->io_stats.io_btw_500_to_5000_msec);
1037         else if(io_duration_time <= 10000)
1038                 atomic64_inc(&fnic_stats->io_stats.io_btw_5000_to_10000_msec);
1039         else if(io_duration_time <= 30000)
1040                 atomic64_inc(&fnic_stats->io_stats.io_btw_10000_to_30000_msec);
1041         else {
1042                 atomic64_inc(&fnic_stats->io_stats.io_greater_than_30000_msec);
1043
1044                 if(io_duration_time > atomic64_read(&fnic_stats->io_stats.current_max_io_time))
1045                         atomic64_set(&fnic_stats->io_stats.current_max_io_time, io_duration_time);
1046         }
1047
1048         /* Call SCSI completion function to complete the IO */
1049         if (sc->scsi_done)
1050                 sc->scsi_done(sc);
1051 }
1052
1053 /* fnic_fcpio_itmf_cmpl_handler
1054  * Routine to handle itmf completions
1055  */
1056 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1057                                         struct fcpio_fw_req *desc)
1058 {
1059         u8 type;
1060         u8 hdr_status;
1061         struct fcpio_tag tag;
1062         u32 id;
1063         struct scsi_cmnd *sc;
1064         struct fnic_io_req *io_req;
1065         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1066         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1067         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1068         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1069         unsigned long flags;
1070         spinlock_t *io_lock;
1071         unsigned long start_time;
1072
1073         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1074         fcpio_tag_id_dec(&tag, &id);
1075
1076         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1077                 shost_printk(KERN_ERR, fnic->lport->host,
1078                 "Tag out of range tag %x hdr status = %s\n",
1079                 id, fnic_fcpio_status_to_str(hdr_status));
1080                 return;
1081         }
1082
1083         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1084         WARN_ON_ONCE(!sc);
1085         if (!sc) {
1086                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1087                 shost_printk(KERN_ERR, fnic->lport->host,
1088                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1089                           fnic_fcpio_status_to_str(hdr_status), id);
1090                 return;
1091         }
1092         io_lock = fnic_io_lock_hash(fnic, sc);
1093         spin_lock_irqsave(io_lock, flags);
1094         io_req = (struct fnic_io_req *)CMD_SP(sc);
1095         WARN_ON_ONCE(!io_req);
1096         if (!io_req) {
1097                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1098                 spin_unlock_irqrestore(io_lock, flags);
1099                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1100                 shost_printk(KERN_ERR, fnic->lport->host,
1101                           "itmf_cmpl io_req is null - "
1102                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1103                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1104                 return;
1105         }
1106         start_time = io_req->start_time;
1107
1108         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1109                 /* Abort and terminate completion of device reset req */
1110                 /* REVISIT : Add asserts about various flags */
1111                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1112                               "dev reset abts cmpl recd. id %x status %s\n",
1113                               id, fnic_fcpio_status_to_str(hdr_status));
1114                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1115                 CMD_ABTS_STATUS(sc) = hdr_status;
1116                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1117                 if (io_req->abts_done)
1118                         complete(io_req->abts_done);
1119                 spin_unlock_irqrestore(io_lock, flags);
1120         } else if (id & FNIC_TAG_ABORT) {
1121                 /* Completion of abort cmd */
1122                 switch (hdr_status) {
1123                 case FCPIO_SUCCESS:
1124                         break;
1125                 case FCPIO_TIMEOUT:
1126                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1127                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1128                         else
1129                                 atomic64_inc(
1130                                         &term_stats->terminate_fw_timeouts);
1131                         break;
1132                 case FCPIO_ITMF_REJECTED:
1133                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1134                                 "abort reject recd. id %d\n",
1135                                 (int)(id & FNIC_TAG_MASK));
1136                         break;
1137                 case FCPIO_IO_NOT_FOUND:
1138                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1139                                 atomic64_inc(&abts_stats->abort_io_not_found);
1140                         else
1141                                 atomic64_inc(
1142                                         &term_stats->terminate_io_not_found);
1143                         break;
1144                 default:
1145                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1146                                 atomic64_inc(&abts_stats->abort_failures);
1147                         else
1148                                 atomic64_inc(
1149                                         &term_stats->terminate_failures);
1150                         break;
1151                 }
1152                 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1153                         /* This is a late completion. Ignore it */
1154                         spin_unlock_irqrestore(io_lock, flags);
1155                         return;
1156                 }
1157
1158                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1159                 CMD_ABTS_STATUS(sc) = hdr_status;
1160
1161                 /* If the status is IO not found consider it as success */
1162                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1163                         CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1164
1165                 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1166                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1167
1168                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1169                               "abts cmpl recd. id %d status %s\n",
1170                               (int)(id & FNIC_TAG_MASK),
1171                               fnic_fcpio_status_to_str(hdr_status));
1172
1173                 /*
1174                  * If scsi_eh thread is blocked waiting for abts to complete,
1175                  * signal completion to it. IO will be cleaned in the thread
1176                  * else clean it in this context
1177                  */
1178                 if (io_req->abts_done) {
1179                         complete(io_req->abts_done);
1180                         spin_unlock_irqrestore(io_lock, flags);
1181                 } else {
1182                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1183                                       "abts cmpl, completing IO\n");
1184                         CMD_SP(sc) = NULL;
1185                         sc->result = (DID_ERROR << 16);
1186
1187                         spin_unlock_irqrestore(io_lock, flags);
1188
1189                         fnic_release_ioreq_buf(fnic, io_req, sc);
1190                         mempool_free(io_req, fnic->io_req_pool);
1191                         if (sc->scsi_done) {
1192                                 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1193                                         sc->device->host->host_no, id,
1194                                         sc,
1195                                         jiffies_to_msecs(jiffies - start_time),
1196                                         desc,
1197                                         (((u64)hdr_status << 40) |
1198                                         (u64)sc->cmnd[0] << 32 |
1199                                         (u64)sc->cmnd[2] << 24 |
1200                                         (u64)sc->cmnd[3] << 16 |
1201                                         (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1202                                         (((u64)CMD_FLAGS(sc) << 32) |
1203                                         CMD_STATE(sc)));
1204                                 sc->scsi_done(sc);
1205                                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1206                                 if (atomic64_read(&fnic->io_cmpl_skip))
1207                                         atomic64_dec(&fnic->io_cmpl_skip);
1208                                 else
1209                                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1210                         }
1211                 }
1212
1213         } else if (id & FNIC_TAG_DEV_RST) {
1214                 /* Completion of device reset */
1215                 CMD_LR_STATUS(sc) = hdr_status;
1216                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1217                         spin_unlock_irqrestore(io_lock, flags);
1218                         CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1219                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1220                                   sc->device->host->host_no, id, sc,
1221                                   jiffies_to_msecs(jiffies - start_time),
1222                                   desc, 0,
1223                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1224                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1225                                 "Terminate pending "
1226                                 "dev reset cmpl recd. id %d status %s\n",
1227                                 (int)(id & FNIC_TAG_MASK),
1228                                 fnic_fcpio_status_to_str(hdr_status));
1229                         return;
1230                 }
1231                 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1232                         /* Need to wait for terminate completion */
1233                         spin_unlock_irqrestore(io_lock, flags);
1234                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1235                                   sc->device->host->host_no, id, sc,
1236                                   jiffies_to_msecs(jiffies - start_time),
1237                                   desc, 0,
1238                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1239                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1240                                 "dev reset cmpl recd after time out. "
1241                                 "id %d status %s\n",
1242                                 (int)(id & FNIC_TAG_MASK),
1243                                 fnic_fcpio_status_to_str(hdr_status));
1244                         return;
1245                 }
1246                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1247                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1248                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1249                               "dev reset cmpl recd. id %d status %s\n",
1250                               (int)(id & FNIC_TAG_MASK),
1251                               fnic_fcpio_status_to_str(hdr_status));
1252                 if (io_req->dr_done)
1253                         complete(io_req->dr_done);
1254                 spin_unlock_irqrestore(io_lock, flags);
1255
1256         } else {
1257                 shost_printk(KERN_ERR, fnic->lport->host,
1258                              "Unexpected itmf io state %s tag %x\n",
1259                              fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1260                 spin_unlock_irqrestore(io_lock, flags);
1261         }
1262
1263 }
1264
1265 /*
1266  * fnic_fcpio_cmpl_handler
1267  * Routine to service the cq for wq_copy
1268  */
1269 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1270                                    unsigned int cq_index,
1271                                    struct fcpio_fw_req *desc)
1272 {
1273         struct fnic *fnic = vnic_dev_priv(vdev);
1274
1275         switch (desc->hdr.type) {
1276         case FCPIO_ICMND_CMPL: /* fw completed a command */
1277         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1278         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1279         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1280         case FCPIO_RESET_CMPL: /* fw completed reset */
1281                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1282                 break;
1283         default:
1284                 break;
1285         }
1286
1287         switch (desc->hdr.type) {
1288         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1289                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1290                 break;
1291
1292         case FCPIO_ICMND_CMPL: /* fw completed a command */
1293                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1294                 break;
1295
1296         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1297                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1298                 break;
1299
1300         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1301         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1302                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1303                 break;
1304
1305         case FCPIO_RESET_CMPL: /* fw completed reset */
1306                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1307                 break;
1308
1309         default:
1310                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1311                               "firmware completion type %d\n",
1312                               desc->hdr.type);
1313                 break;
1314         }
1315
1316         return 0;
1317 }
1318
1319 /*
1320  * fnic_wq_copy_cmpl_handler
1321  * Routine to process wq copy
1322  */
1323 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1324 {
1325         unsigned int wq_work_done = 0;
1326         unsigned int i, cq_index;
1327         unsigned int cur_work_done;
1328         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1329         u64 start_jiffies = 0;
1330         u64 end_jiffies = 0;
1331         u64 delta_jiffies = 0;
1332         u64 delta_ms = 0;
1333
1334         for (i = 0; i < fnic->wq_copy_count; i++) {
1335                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1336
1337                 start_jiffies = jiffies;
1338                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1339                                                      fnic_fcpio_cmpl_handler,
1340                                                      copy_work_to_do);
1341                 end_jiffies = jiffies;
1342
1343                 wq_work_done += cur_work_done;
1344                 delta_jiffies = end_jiffies - start_jiffies;
1345                 if (delta_jiffies >
1346                         (u64) atomic64_read(&misc_stats->max_isr_jiffies)) {
1347                         atomic64_set(&misc_stats->max_isr_jiffies,
1348                                         delta_jiffies);
1349                         delta_ms = jiffies_to_msecs(delta_jiffies);
1350                         atomic64_set(&misc_stats->max_isr_time_ms, delta_ms);
1351                         atomic64_set(&misc_stats->corr_work_done,
1352                                         cur_work_done);
1353                 }
1354         }
1355         return wq_work_done;
1356 }
1357
1358 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
1359 {
1360         int i;
1361         struct fnic_io_req *io_req;
1362         unsigned long flags = 0;
1363         struct scsi_cmnd *sc;
1364         spinlock_t *io_lock;
1365         unsigned long start_time = 0;
1366         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1367
1368         for (i = 0; i < fnic->fnic_max_tag_id; i++) {
1369                 if (i == exclude_id)
1370                         continue;
1371
1372                 io_lock = fnic_io_lock_tag(fnic, i);
1373                 spin_lock_irqsave(io_lock, flags);
1374                 sc = scsi_host_find_tag(fnic->lport->host, i);
1375                 if (!sc) {
1376                         spin_unlock_irqrestore(io_lock, flags);
1377                         continue;
1378                 }
1379
1380                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1381                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1382                         !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1383                         /*
1384                          * We will be here only when FW completes reset
1385                          * without sending completions for outstanding ios.
1386                          */
1387                         CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1388                         if (io_req && io_req->dr_done)
1389                                 complete(io_req->dr_done);
1390                         else if (io_req && io_req->abts_done)
1391                                 complete(io_req->abts_done);
1392                         spin_unlock_irqrestore(io_lock, flags);
1393                         continue;
1394                 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1395                         spin_unlock_irqrestore(io_lock, flags);
1396                         continue;
1397                 }
1398                 if (!io_req) {
1399                         spin_unlock_irqrestore(io_lock, flags);
1400                         goto cleanup_scsi_cmd;
1401                 }
1402
1403                 CMD_SP(sc) = NULL;
1404
1405                 spin_unlock_irqrestore(io_lock, flags);
1406
1407                 /*
1408                  * If there is a scsi_cmnd associated with this io_req, then
1409                  * free the corresponding state
1410                  */
1411                 start_time = io_req->start_time;
1412                 fnic_release_ioreq_buf(fnic, io_req, sc);
1413                 mempool_free(io_req, fnic->io_req_pool);
1414
1415 cleanup_scsi_cmd:
1416                 sc->result = DID_TRANSPORT_DISRUPTED << 16;
1417                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1418                               "%s: tag:0x%x : sc:0x%p duration = %lu DID_TRANSPORT_DISRUPTED\n",
1419                               __func__, sc->request->tag, sc,
1420                               (jiffies - start_time));
1421
1422                 if (atomic64_read(&fnic->io_cmpl_skip))
1423                         atomic64_dec(&fnic->io_cmpl_skip);
1424                 else
1425                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1426
1427                 /* Complete the command to SCSI */
1428                 if (sc->scsi_done) {
1429                         if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED))
1430                                 shost_printk(KERN_ERR, fnic->lport->host,
1431                                 "Calling done for IO not issued to fw: tag:0x%x sc:0x%p\n",
1432                                  sc->request->tag, sc);
1433
1434                         FNIC_TRACE(fnic_cleanup_io,
1435                                   sc->device->host->host_no, i, sc,
1436                                   jiffies_to_msecs(jiffies - start_time),
1437                                   0, ((u64)sc->cmnd[0] << 32 |
1438                                   (u64)sc->cmnd[2] << 24 |
1439                                   (u64)sc->cmnd[3] << 16 |
1440                                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1441                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1442
1443                         sc->scsi_done(sc);
1444                 }
1445         }
1446 }
1447
1448 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1449                                   struct fcpio_host_req *desc)
1450 {
1451         u32 id;
1452         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1453         struct fnic_io_req *io_req;
1454         struct scsi_cmnd *sc;
1455         unsigned long flags;
1456         spinlock_t *io_lock;
1457         unsigned long start_time = 0;
1458
1459         /* get the tag reference */
1460         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1461         id &= FNIC_TAG_MASK;
1462
1463         if (id >= fnic->fnic_max_tag_id)
1464                 return;
1465
1466         sc = scsi_host_find_tag(fnic->lport->host, id);
1467         if (!sc)
1468                 return;
1469
1470         io_lock = fnic_io_lock_hash(fnic, sc);
1471         spin_lock_irqsave(io_lock, flags);
1472
1473         /* Get the IO context which this desc refers to */
1474         io_req = (struct fnic_io_req *)CMD_SP(sc);
1475
1476         /* fnic interrupts are turned off by now */
1477
1478         if (!io_req) {
1479                 spin_unlock_irqrestore(io_lock, flags);
1480                 goto wq_copy_cleanup_scsi_cmd;
1481         }
1482
1483         CMD_SP(sc) = NULL;
1484
1485         spin_unlock_irqrestore(io_lock, flags);
1486
1487         start_time = io_req->start_time;
1488         fnic_release_ioreq_buf(fnic, io_req, sc);
1489         mempool_free(io_req, fnic->io_req_pool);
1490
1491 wq_copy_cleanup_scsi_cmd:
1492         sc->result = DID_NO_CONNECT << 16;
1493         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1494                       " DID_NO_CONNECT\n");
1495
1496         if (sc->scsi_done) {
1497                 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1498                           sc->device->host->host_no, id, sc,
1499                           jiffies_to_msecs(jiffies - start_time),
1500                           0, ((u64)sc->cmnd[0] << 32 |
1501                           (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1502                           (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1503                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1504
1505                 sc->scsi_done(sc);
1506         }
1507 }
1508
1509 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1510                                           u32 task_req, u8 *fc_lun,
1511                                           struct fnic_io_req *io_req)
1512 {
1513         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1514         struct Scsi_Host *host = fnic->lport->host;
1515         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1516         unsigned long flags;
1517
1518         spin_lock_irqsave(host->host_lock, flags);
1519         if (unlikely(fnic_chk_state_flags_locked(fnic,
1520                                                 FNIC_FLAGS_IO_BLOCKED))) {
1521                 spin_unlock_irqrestore(host->host_lock, flags);
1522                 return 1;
1523         } else
1524                 atomic_inc(&fnic->in_flight);
1525         spin_unlock_irqrestore(host->host_lock, flags);
1526
1527         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1528
1529         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1530                 free_wq_copy_descs(fnic, wq);
1531
1532         if (!vnic_wq_copy_desc_avail(wq)) {
1533                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1534                 atomic_dec(&fnic->in_flight);
1535                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1536                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1537                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1538                 return 1;
1539         }
1540         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1541                                      0, task_req, tag, fc_lun, io_req->port_id,
1542                                      fnic->config.ra_tov, fnic->config.ed_tov);
1543
1544         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1545         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1546                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1547                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1548                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1549
1550         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1551         atomic_dec(&fnic->in_flight);
1552
1553         return 0;
1554 }
1555
1556 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1557 {
1558         int tag;
1559         int abt_tag;
1560         int term_cnt = 0;
1561         struct fnic_io_req *io_req;
1562         spinlock_t *io_lock;
1563         unsigned long flags;
1564         struct scsi_cmnd *sc;
1565         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1566         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1567         struct scsi_lun fc_lun;
1568         enum fnic_ioreq_state old_ioreq_state;
1569
1570         FNIC_SCSI_DBG(KERN_DEBUG,
1571                       fnic->lport->host,
1572                       "fnic_rport_exch_reset called portid 0x%06x\n",
1573                       port_id);
1574
1575         if (fnic->in_remove)
1576                 return;
1577
1578         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1579                 abt_tag = tag;
1580                 io_lock = fnic_io_lock_tag(fnic, tag);
1581                 spin_lock_irqsave(io_lock, flags);
1582                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1583                 if (!sc) {
1584                         spin_unlock_irqrestore(io_lock, flags);
1585                         continue;
1586                 }
1587
1588                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1589
1590                 if (!io_req || io_req->port_id != port_id) {
1591                         spin_unlock_irqrestore(io_lock, flags);
1592                         continue;
1593                 }
1594
1595                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1596                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1597                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1598                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1599                         sc);
1600                         spin_unlock_irqrestore(io_lock, flags);
1601                         continue;
1602                 }
1603
1604                 /*
1605                  * Found IO that is still pending with firmware and
1606                  * belongs to rport that went away
1607                  */
1608                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1609                         spin_unlock_irqrestore(io_lock, flags);
1610                         continue;
1611                 }
1612                 if (io_req->abts_done) {
1613                         shost_printk(KERN_ERR, fnic->lport->host,
1614                         "fnic_rport_exch_reset: io_req->abts_done is set "
1615                         "state is %s\n",
1616                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1617                 }
1618
1619                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1620                         shost_printk(KERN_ERR, fnic->lport->host,
1621                                   "rport_exch_reset "
1622                                   "IO not yet issued %p tag 0x%x flags "
1623                                   "%x state %d\n",
1624                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1625                 }
1626                 old_ioreq_state = CMD_STATE(sc);
1627                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1628                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1629                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1630                         atomic64_inc(&reset_stats->device_reset_terminates);
1631                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1632                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1633                         "fnic_rport_exch_reset dev rst sc 0x%p\n",
1634                         sc);
1635                 }
1636
1637                 BUG_ON(io_req->abts_done);
1638
1639                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1640                               "fnic_rport_reset_exch: Issuing abts\n");
1641
1642                 spin_unlock_irqrestore(io_lock, flags);
1643
1644                 /* Now queue the abort command to firmware */
1645                 int_to_scsilun(sc->device->lun, &fc_lun);
1646
1647                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1648                                             FCPIO_ITMF_ABT_TASK_TERM,
1649                                             fc_lun.scsi_lun, io_req)) {
1650                         /*
1651                          * Revert the cmd state back to old state, if
1652                          * it hasn't changed in between. This cmd will get
1653                          * aborted later by scsi_eh, or cleaned up during
1654                          * lun reset
1655                          */
1656                         spin_lock_irqsave(io_lock, flags);
1657                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1658                                 CMD_STATE(sc) = old_ioreq_state;
1659                         spin_unlock_irqrestore(io_lock, flags);
1660                 } else {
1661                         spin_lock_irqsave(io_lock, flags);
1662                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1663                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1664                         else
1665                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1666                         spin_unlock_irqrestore(io_lock, flags);
1667                         atomic64_inc(&term_stats->terminates);
1668                         term_cnt++;
1669                 }
1670         }
1671         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1672                 atomic64_set(&term_stats->max_terminates, term_cnt);
1673
1674 }
1675
1676 void fnic_terminate_rport_io(struct fc_rport *rport)
1677 {
1678         int tag;
1679         int abt_tag;
1680         int term_cnt = 0;
1681         struct fnic_io_req *io_req;
1682         spinlock_t *io_lock;
1683         unsigned long flags;
1684         struct scsi_cmnd *sc;
1685         struct scsi_lun fc_lun;
1686         struct fc_rport_libfc_priv *rdata;
1687         struct fc_lport *lport;
1688         struct fnic *fnic;
1689         struct fc_rport *cmd_rport;
1690         struct reset_stats *reset_stats;
1691         struct terminate_stats *term_stats;
1692         enum fnic_ioreq_state old_ioreq_state;
1693
1694         if (!rport) {
1695                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1696                 return;
1697         }
1698         rdata = rport->dd_data;
1699
1700         if (!rdata) {
1701                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1702                 return;
1703         }
1704         lport = rdata->local_port;
1705
1706         if (!lport) {
1707                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1708                 return;
1709         }
1710         fnic = lport_priv(lport);
1711         FNIC_SCSI_DBG(KERN_DEBUG,
1712                       fnic->lport->host, "fnic_terminate_rport_io called"
1713                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1714                       rport->port_name, rport->node_name, rport,
1715                       rport->port_id);
1716
1717         if (fnic->in_remove)
1718                 return;
1719
1720         reset_stats = &fnic->fnic_stats.reset_stats;
1721         term_stats = &fnic->fnic_stats.term_stats;
1722
1723         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1724                 abt_tag = tag;
1725                 io_lock = fnic_io_lock_tag(fnic, tag);
1726                 spin_lock_irqsave(io_lock, flags);
1727                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1728                 if (!sc) {
1729                         spin_unlock_irqrestore(io_lock, flags);
1730                         continue;
1731                 }
1732
1733                 cmd_rport = starget_to_rport(scsi_target(sc->device));
1734                 if (rport != cmd_rport) {
1735                         spin_unlock_irqrestore(io_lock, flags);
1736                         continue;
1737                 }
1738
1739                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1740
1741                 if (!io_req || rport != cmd_rport) {
1742                         spin_unlock_irqrestore(io_lock, flags);
1743                         continue;
1744                 }
1745
1746                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1747                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1748                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1749                         "fnic_terminate_rport_io dev rst not pending sc 0x%p\n",
1750                         sc);
1751                         spin_unlock_irqrestore(io_lock, flags);
1752                         continue;
1753                 }
1754                 /*
1755                  * Found IO that is still pending with firmware and
1756                  * belongs to rport that went away
1757                  */
1758                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1759                         spin_unlock_irqrestore(io_lock, flags);
1760                         continue;
1761                 }
1762                 if (io_req->abts_done) {
1763                         shost_printk(KERN_ERR, fnic->lport->host,
1764                         "fnic_terminate_rport_io: io_req->abts_done is set "
1765                         "state is %s\n",
1766                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1767                 }
1768                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1769                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1770                                   "fnic_terminate_rport_io "
1771                                   "IO not yet issued %p tag 0x%x flags "
1772                                   "%x state %d\n",
1773                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1774                 }
1775                 old_ioreq_state = CMD_STATE(sc);
1776                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1777                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1778                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1779                         atomic64_inc(&reset_stats->device_reset_terminates);
1780                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1781                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1782                         "fnic_terminate_rport_io dev rst sc 0x%p\n", sc);
1783                 }
1784
1785                 BUG_ON(io_req->abts_done);
1786
1787                 FNIC_SCSI_DBG(KERN_DEBUG,
1788                               fnic->lport->host,
1789                               "fnic_terminate_rport_io: Issuing abts\n");
1790
1791                 spin_unlock_irqrestore(io_lock, flags);
1792
1793                 /* Now queue the abort command to firmware */
1794                 int_to_scsilun(sc->device->lun, &fc_lun);
1795
1796                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1797                                             FCPIO_ITMF_ABT_TASK_TERM,
1798                                             fc_lun.scsi_lun, io_req)) {
1799                         /*
1800                          * Revert the cmd state back to old state, if
1801                          * it hasn't changed in between. This cmd will get
1802                          * aborted later by scsi_eh, or cleaned up during
1803                          * lun reset
1804                          */
1805                         spin_lock_irqsave(io_lock, flags);
1806                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1807                                 CMD_STATE(sc) = old_ioreq_state;
1808                         spin_unlock_irqrestore(io_lock, flags);
1809                 } else {
1810                         spin_lock_irqsave(io_lock, flags);
1811                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1812                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1813                         else
1814                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1815                         spin_unlock_irqrestore(io_lock, flags);
1816                         atomic64_inc(&term_stats->terminates);
1817                         term_cnt++;
1818                 }
1819         }
1820         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1821                 atomic64_set(&term_stats->max_terminates, term_cnt);
1822
1823 }
1824
1825 /*
1826  * This function is exported to SCSI for sending abort cmnds.
1827  * A SCSI IO is represented by a io_req in the driver.
1828  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1829  */
1830 int fnic_abort_cmd(struct scsi_cmnd *sc)
1831 {
1832         struct fc_lport *lp;
1833         struct fnic *fnic;
1834         struct fnic_io_req *io_req = NULL;
1835         struct fc_rport *rport;
1836         spinlock_t *io_lock;
1837         unsigned long flags;
1838         unsigned long start_time = 0;
1839         int ret = SUCCESS;
1840         u32 task_req = 0;
1841         struct scsi_lun fc_lun;
1842         struct fnic_stats *fnic_stats;
1843         struct abort_stats *abts_stats;
1844         struct terminate_stats *term_stats;
1845         enum fnic_ioreq_state old_ioreq_state;
1846         int tag;
1847         unsigned long abt_issued_time;
1848         DECLARE_COMPLETION_ONSTACK(tm_done);
1849
1850         /* Wait for rport to unblock */
1851         fc_block_scsi_eh(sc);
1852
1853         /* Get local-port, check ready and link up */
1854         lp = shost_priv(sc->device->host);
1855
1856         fnic = lport_priv(lp);
1857         fnic_stats = &fnic->fnic_stats;
1858         abts_stats = &fnic->fnic_stats.abts_stats;
1859         term_stats = &fnic->fnic_stats.term_stats;
1860
1861         rport = starget_to_rport(scsi_target(sc->device));
1862         tag = sc->request->tag;
1863         FNIC_SCSI_DBG(KERN_DEBUG,
1864                 fnic->lport->host,
1865                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1866                 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1867
1868         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1869
1870         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1871                 ret = FAILED;
1872                 goto fnic_abort_cmd_end;
1873         }
1874
1875         /*
1876          * Avoid a race between SCSI issuing the abort and the device
1877          * completing the command.
1878          *
1879          * If the command is already completed by the fw cmpl code,
1880          * we just return SUCCESS from here. This means that the abort
1881          * succeeded. In the SCSI ML, since the timeout for command has
1882          * happened, the completion wont actually complete the command
1883          * and it will be considered as an aborted command
1884          *
1885          * The CMD_SP will not be cleared except while holding io_req_lock.
1886          */
1887         io_lock = fnic_io_lock_hash(fnic, sc);
1888         spin_lock_irqsave(io_lock, flags);
1889         io_req = (struct fnic_io_req *)CMD_SP(sc);
1890         if (!io_req) {
1891                 spin_unlock_irqrestore(io_lock, flags);
1892                 goto fnic_abort_cmd_end;
1893         }
1894
1895         io_req->abts_done = &tm_done;
1896
1897         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1898                 spin_unlock_irqrestore(io_lock, flags);
1899                 goto wait_pending;
1900         }
1901
1902         abt_issued_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1903         if (abt_issued_time <= 6000)
1904                 atomic64_inc(&abts_stats->abort_issued_btw_0_to_6_sec);
1905         else if (abt_issued_time > 6000 && abt_issued_time <= 20000)
1906                 atomic64_inc(&abts_stats->abort_issued_btw_6_to_20_sec);
1907         else if (abt_issued_time > 20000 && abt_issued_time <= 30000)
1908                 atomic64_inc(&abts_stats->abort_issued_btw_20_to_30_sec);
1909         else if (abt_issued_time > 30000 && abt_issued_time <= 40000)
1910                 atomic64_inc(&abts_stats->abort_issued_btw_30_to_40_sec);
1911         else if (abt_issued_time > 40000 && abt_issued_time <= 50000)
1912                 atomic64_inc(&abts_stats->abort_issued_btw_40_to_50_sec);
1913         else if (abt_issued_time > 50000 && abt_issued_time <= 60000)
1914                 atomic64_inc(&abts_stats->abort_issued_btw_50_to_60_sec);
1915         else
1916                 atomic64_inc(&abts_stats->abort_issued_greater_than_60_sec);
1917
1918         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1919                 "CBD Opcode: %02x Abort issued time: %lu msec\n", sc->cmnd[0], abt_issued_time);
1920         /*
1921          * Command is still pending, need to abort it
1922          * If the firmware completes the command after this point,
1923          * the completion wont be done till mid-layer, since abort
1924          * has already started.
1925          */
1926         old_ioreq_state = CMD_STATE(sc);
1927         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1928         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1929
1930         spin_unlock_irqrestore(io_lock, flags);
1931
1932         /*
1933          * Check readiness of the remote port. If the path to remote
1934          * port is up, then send abts to the remote port to terminate
1935          * the IO. Else, just locally terminate the IO in the firmware
1936          */
1937         if (fc_remote_port_chkready(rport) == 0)
1938                 task_req = FCPIO_ITMF_ABT_TASK;
1939         else {
1940                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1941                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1942         }
1943
1944         /* Now queue the abort command to firmware */
1945         int_to_scsilun(sc->device->lun, &fc_lun);
1946
1947         if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1948                                     fc_lun.scsi_lun, io_req)) {
1949                 spin_lock_irqsave(io_lock, flags);
1950                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1951                         CMD_STATE(sc) = old_ioreq_state;
1952                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1953                 if (io_req)
1954                         io_req->abts_done = NULL;
1955                 spin_unlock_irqrestore(io_lock, flags);
1956                 ret = FAILED;
1957                 goto fnic_abort_cmd_end;
1958         }
1959         if (task_req == FCPIO_ITMF_ABT_TASK) {
1960                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1961                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1962         } else {
1963                 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1964                 atomic64_inc(&fnic_stats->term_stats.terminates);
1965         }
1966
1967         /*
1968          * We queued an abort IO, wait for its completion.
1969          * Once the firmware completes the abort command, it will
1970          * wake up this thread.
1971          */
1972  wait_pending:
1973         wait_for_completion_timeout(&tm_done,
1974                                     msecs_to_jiffies
1975                                     (2 * fnic->config.ra_tov +
1976                                      fnic->config.ed_tov));
1977
1978         /* Check the abort status */
1979         spin_lock_irqsave(io_lock, flags);
1980
1981         io_req = (struct fnic_io_req *)CMD_SP(sc);
1982         if (!io_req) {
1983                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1984                 spin_unlock_irqrestore(io_lock, flags);
1985                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1986                 ret = FAILED;
1987                 goto fnic_abort_cmd_end;
1988         }
1989         io_req->abts_done = NULL;
1990
1991         /* fw did not complete abort, timed out */
1992         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1993                 spin_unlock_irqrestore(io_lock, flags);
1994                 if (task_req == FCPIO_ITMF_ABT_TASK) {
1995                         atomic64_inc(&abts_stats->abort_drv_timeouts);
1996                 } else {
1997                         atomic64_inc(&term_stats->terminate_drv_timeouts);
1998                 }
1999                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
2000                 ret = FAILED;
2001                 goto fnic_abort_cmd_end;
2002         }
2003
2004         /* IO out of order */
2005
2006         if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
2007                 spin_unlock_irqrestore(io_lock, flags);
2008                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2009                         "Issuing Host reset due to out of order IO\n");
2010
2011                 ret = FAILED;
2012                 goto fnic_abort_cmd_end;
2013         }
2014
2015         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2016
2017         start_time = io_req->start_time;
2018         /*
2019          * firmware completed the abort, check the status,
2020          * free the io_req if successful. If abort fails,
2021          * Device reset will clean the I/O.
2022          */
2023         if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
2024                 CMD_SP(sc) = NULL;
2025         else {
2026                 ret = FAILED;
2027                 spin_unlock_irqrestore(io_lock, flags);
2028                 goto fnic_abort_cmd_end;
2029         }
2030
2031         spin_unlock_irqrestore(io_lock, flags);
2032
2033         fnic_release_ioreq_buf(fnic, io_req, sc);
2034         mempool_free(io_req, fnic->io_req_pool);
2035
2036         if (sc->scsi_done) {
2037         /* Call SCSI completion function to complete the IO */
2038                 sc->result = (DID_ABORT << 16);
2039                 sc->scsi_done(sc);
2040                 atomic64_dec(&fnic_stats->io_stats.active_ios);
2041                 if (atomic64_read(&fnic->io_cmpl_skip))
2042                         atomic64_dec(&fnic->io_cmpl_skip);
2043                 else
2044                         atomic64_inc(&fnic_stats->io_stats.io_completions);
2045         }
2046
2047 fnic_abort_cmd_end:
2048         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
2049                   sc->request->tag, sc,
2050                   jiffies_to_msecs(jiffies - start_time),
2051                   0, ((u64)sc->cmnd[0] << 32 |
2052                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2053                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2054                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2055
2056         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2057                       "Returning from abort cmd type %x %s\n", task_req,
2058                       (ret == SUCCESS) ?
2059                       "SUCCESS" : "FAILED");
2060         return ret;
2061 }
2062
2063 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
2064                                        struct scsi_cmnd *sc,
2065                                        struct fnic_io_req *io_req)
2066 {
2067         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
2068         struct Scsi_Host *host = fnic->lport->host;
2069         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
2070         struct scsi_lun fc_lun;
2071         int ret = 0;
2072         unsigned long intr_flags;
2073
2074         spin_lock_irqsave(host->host_lock, intr_flags);
2075         if (unlikely(fnic_chk_state_flags_locked(fnic,
2076                                                 FNIC_FLAGS_IO_BLOCKED))) {
2077                 spin_unlock_irqrestore(host->host_lock, intr_flags);
2078                 return FAILED;
2079         } else
2080                 atomic_inc(&fnic->in_flight);
2081         spin_unlock_irqrestore(host->host_lock, intr_flags);
2082
2083         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
2084
2085         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
2086                 free_wq_copy_descs(fnic, wq);
2087
2088         if (!vnic_wq_copy_desc_avail(wq)) {
2089                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2090                           "queue_dr_io_req failure - no descriptors\n");
2091                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
2092                 ret = -EAGAIN;
2093                 goto lr_io_req_end;
2094         }
2095
2096         /* fill in the lun info */
2097         int_to_scsilun(sc->device->lun, &fc_lun);
2098
2099         fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
2100                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
2101                                      fc_lun.scsi_lun, io_req->port_id,
2102                                      fnic->config.ra_tov, fnic->config.ed_tov);
2103
2104         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2105         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2106                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2107                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2108                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2109
2110 lr_io_req_end:
2111         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2112         atomic_dec(&fnic->in_flight);
2113
2114         return ret;
2115 }
2116
2117 /*
2118  * Clean up any pending aborts on the lun
2119  * For each outstanding IO on this lun, whose abort is not completed by fw,
2120  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2121  * successfully aborted, 1 otherwise
2122  */
2123 static int fnic_clean_pending_aborts(struct fnic *fnic,
2124                                      struct scsi_cmnd *lr_sc,
2125                                          bool new_sc)
2126
2127 {
2128         int tag, abt_tag;
2129         struct fnic_io_req *io_req;
2130         spinlock_t *io_lock;
2131         unsigned long flags;
2132         int ret = 0;
2133         struct scsi_cmnd *sc;
2134         struct scsi_lun fc_lun;
2135         struct scsi_device *lun_dev = lr_sc->device;
2136         DECLARE_COMPLETION_ONSTACK(tm_done);
2137         enum fnic_ioreq_state old_ioreq_state;
2138
2139         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2140                 io_lock = fnic_io_lock_tag(fnic, tag);
2141                 spin_lock_irqsave(io_lock, flags);
2142                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2143                 /*
2144                  * ignore this lun reset cmd if issued using new SC
2145                  * or cmds that do not belong to this lun
2146                  */
2147                 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) {
2148                         spin_unlock_irqrestore(io_lock, flags);
2149                         continue;
2150                 }
2151
2152                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2153
2154                 if (!io_req || sc->device != lun_dev) {
2155                         spin_unlock_irqrestore(io_lock, flags);
2156                         continue;
2157                 }
2158
2159                 /*
2160                  * Found IO that is still pending with firmware and
2161                  * belongs to the LUN that we are resetting
2162                  */
2163                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2164                               "Found IO in %s on lun\n",
2165                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2166
2167                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2168                         spin_unlock_irqrestore(io_lock, flags);
2169                         continue;
2170                 }
2171                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2172                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2173                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2174                                 "%s dev rst not pending sc 0x%p\n", __func__,
2175                                 sc);
2176                         spin_unlock_irqrestore(io_lock, flags);
2177                         continue;
2178                 }
2179
2180                 if (io_req->abts_done)
2181                         shost_printk(KERN_ERR, fnic->lport->host,
2182                           "%s: io_req->abts_done is set state is %s\n",
2183                           __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2184                 old_ioreq_state = CMD_STATE(sc);
2185                 /*
2186                  * Any pending IO issued prior to reset is expected to be
2187                  * in abts pending state, if not we need to set
2188                  * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2189                  * When IO is completed, the IO will be handed over and
2190                  * handled in this function.
2191                  */
2192                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2193
2194                 BUG_ON(io_req->abts_done);
2195
2196                 abt_tag = tag;
2197                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2198                         abt_tag |= FNIC_TAG_DEV_RST;
2199                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2200                                   "%s: dev rst sc 0x%p\n", __func__, sc);
2201                 }
2202
2203                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2204                 io_req->abts_done = &tm_done;
2205                 spin_unlock_irqrestore(io_lock, flags);
2206
2207                 /* Now queue the abort command to firmware */
2208                 int_to_scsilun(sc->device->lun, &fc_lun);
2209
2210                 if (fnic_queue_abort_io_req(fnic, abt_tag,
2211                                             FCPIO_ITMF_ABT_TASK_TERM,
2212                                             fc_lun.scsi_lun, io_req)) {
2213                         spin_lock_irqsave(io_lock, flags);
2214                         io_req = (struct fnic_io_req *)CMD_SP(sc);
2215                         if (io_req)
2216                                 io_req->abts_done = NULL;
2217                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2218                                 CMD_STATE(sc) = old_ioreq_state;
2219                         spin_unlock_irqrestore(io_lock, flags);
2220                         ret = 1;
2221                         goto clean_pending_aborts_end;
2222                 } else {
2223                         spin_lock_irqsave(io_lock, flags);
2224                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2225                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2226                         spin_unlock_irqrestore(io_lock, flags);
2227                 }
2228                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2229
2230                 wait_for_completion_timeout(&tm_done,
2231                                             msecs_to_jiffies
2232                                             (fnic->config.ed_tov));
2233
2234                 /* Recheck cmd state to check if it is now aborted */
2235                 spin_lock_irqsave(io_lock, flags);
2236                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2237                 if (!io_req) {
2238                         spin_unlock_irqrestore(io_lock, flags);
2239                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2240                         continue;
2241                 }
2242
2243                 io_req->abts_done = NULL;
2244
2245                 /* if abort is still pending with fw, fail */
2246                 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2247                         spin_unlock_irqrestore(io_lock, flags);
2248                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2249                         ret = 1;
2250                         goto clean_pending_aborts_end;
2251                 }
2252                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2253
2254                 /* original sc used for lr is handled by dev reset code */
2255                 if (sc != lr_sc)
2256                         CMD_SP(sc) = NULL;
2257                 spin_unlock_irqrestore(io_lock, flags);
2258
2259                 /* original sc used for lr is handled by dev reset code */
2260                 if (sc != lr_sc) {
2261                         fnic_release_ioreq_buf(fnic, io_req, sc);
2262                         mempool_free(io_req, fnic->io_req_pool);
2263                 }
2264
2265                 /*
2266                  * Any IO is returned during reset, it needs to call scsi_done
2267                  * to return the scsi_cmnd to upper layer.
2268                  */
2269                 if (sc->scsi_done) {
2270                         /* Set result to let upper SCSI layer retry */
2271                         sc->result = DID_RESET << 16;
2272                         sc->scsi_done(sc);
2273                 }
2274         }
2275
2276         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2277
2278         /* walk again to check, if IOs are still pending in fw */
2279         if (fnic_is_abts_pending(fnic, lr_sc))
2280                 ret = FAILED;
2281
2282 clean_pending_aborts_end:
2283         return ret;
2284 }
2285
2286 /**
2287  * fnic_scsi_host_start_tag
2288  * Allocates tagid from host's tag list
2289  **/
2290 static inline int
2291 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2292 {
2293         struct request_queue *q = sc->request->q;
2294         struct request *dummy;
2295
2296         dummy = blk_mq_alloc_request(q, REQ_OP_WRITE, BLK_MQ_REQ_NOWAIT);
2297         if (IS_ERR(dummy))
2298                 return SCSI_NO_TAG;
2299
2300         sc->tag = sc->request->tag = dummy->tag;
2301         sc->host_scribble = (unsigned char *)dummy;
2302
2303         return dummy->tag;
2304 }
2305
2306 /**
2307  * fnic_scsi_host_end_tag
2308  * frees tag allocated by fnic_scsi_host_start_tag.
2309  **/
2310 static inline void
2311 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2312 {
2313         struct request *dummy = (struct request *)sc->host_scribble;
2314
2315         blk_mq_free_request(dummy);
2316 }
2317
2318 /*
2319  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2320  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2321  * on the LUN.
2322  */
2323 int fnic_device_reset(struct scsi_cmnd *sc)
2324 {
2325         struct fc_lport *lp;
2326         struct fnic *fnic;
2327         struct fnic_io_req *io_req = NULL;
2328         struct fc_rport *rport;
2329         int status;
2330         int ret = FAILED;
2331         spinlock_t *io_lock;
2332         unsigned long flags;
2333         unsigned long start_time = 0;
2334         struct scsi_lun fc_lun;
2335         struct fnic_stats *fnic_stats;
2336         struct reset_stats *reset_stats;
2337         int tag = 0;
2338         DECLARE_COMPLETION_ONSTACK(tm_done);
2339         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2340         bool new_sc = 0;
2341
2342         /* Wait for rport to unblock */
2343         fc_block_scsi_eh(sc);
2344
2345         /* Get local-port, check ready and link up */
2346         lp = shost_priv(sc->device->host);
2347
2348         fnic = lport_priv(lp);
2349         fnic_stats = &fnic->fnic_stats;
2350         reset_stats = &fnic->fnic_stats.reset_stats;
2351
2352         atomic64_inc(&reset_stats->device_resets);
2353
2354         rport = starget_to_rport(scsi_target(sc->device));
2355         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2356                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2357                       rport->port_id, sc->device->lun, sc);
2358
2359         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2360                 goto fnic_device_reset_end;
2361
2362         /* Check if remote port up */
2363         if (fc_remote_port_chkready(rport)) {
2364                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2365                 goto fnic_device_reset_end;
2366         }
2367
2368         CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2369         /* Allocate tag if not present */
2370
2371         tag = sc->request->tag;
2372         if (unlikely(tag < 0)) {
2373                 /*
2374                  * Really should fix the midlayer to pass in a proper
2375                  * request for ioctls...
2376                  */
2377                 tag = fnic_scsi_host_start_tag(fnic, sc);
2378                 if (unlikely(tag == SCSI_NO_TAG))
2379                         goto fnic_device_reset_end;
2380                 tag_gen_flag = 1;
2381                 new_sc = 1;
2382         }
2383         io_lock = fnic_io_lock_hash(fnic, sc);
2384         spin_lock_irqsave(io_lock, flags);
2385         io_req = (struct fnic_io_req *)CMD_SP(sc);
2386
2387         /*
2388          * If there is a io_req attached to this command, then use it,
2389          * else allocate a new one.
2390          */
2391         if (!io_req) {
2392                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2393                 if (!io_req) {
2394                         spin_unlock_irqrestore(io_lock, flags);
2395                         goto fnic_device_reset_end;
2396                 }
2397                 memset(io_req, 0, sizeof(*io_req));
2398                 io_req->port_id = rport->port_id;
2399                 CMD_SP(sc) = (char *)io_req;
2400         }
2401         io_req->dr_done = &tm_done;
2402         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2403         CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2404         spin_unlock_irqrestore(io_lock, flags);
2405
2406         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2407
2408         /*
2409          * issue the device reset, if enqueue failed, clean up the ioreq
2410          * and break assoc with scsi cmd
2411          */
2412         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2413                 spin_lock_irqsave(io_lock, flags);
2414                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2415                 if (io_req)
2416                         io_req->dr_done = NULL;
2417                 goto fnic_device_reset_clean;
2418         }
2419         spin_lock_irqsave(io_lock, flags);
2420         CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2421         spin_unlock_irqrestore(io_lock, flags);
2422
2423         /*
2424          * Wait on the local completion for LUN reset.  The io_req may be
2425          * freed while we wait since we hold no lock.
2426          */
2427         wait_for_completion_timeout(&tm_done,
2428                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2429
2430         spin_lock_irqsave(io_lock, flags);
2431         io_req = (struct fnic_io_req *)CMD_SP(sc);
2432         if (!io_req) {
2433                 spin_unlock_irqrestore(io_lock, flags);
2434                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2435                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2436                 goto fnic_device_reset_end;
2437         }
2438         io_req->dr_done = NULL;
2439
2440         status = CMD_LR_STATUS(sc);
2441
2442         /*
2443          * If lun reset not completed, bail out with failed. io_req
2444          * gets cleaned up during higher levels of EH
2445          */
2446         if (status == FCPIO_INVALID_CODE) {
2447                 atomic64_inc(&reset_stats->device_reset_timeouts);
2448                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2449                               "Device reset timed out\n");
2450                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2451                 spin_unlock_irqrestore(io_lock, flags);
2452                 int_to_scsilun(sc->device->lun, &fc_lun);
2453                 /*
2454                  * Issue abort and terminate on device reset request.
2455                  * If q'ing of terminate fails, retry it after a delay.
2456                  */
2457                 while (1) {
2458                         spin_lock_irqsave(io_lock, flags);
2459                         if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2460                                 spin_unlock_irqrestore(io_lock, flags);
2461                                 break;
2462                         }
2463                         spin_unlock_irqrestore(io_lock, flags);
2464                         if (fnic_queue_abort_io_req(fnic,
2465                                 tag | FNIC_TAG_DEV_RST,
2466                                 FCPIO_ITMF_ABT_TASK_TERM,
2467                                 fc_lun.scsi_lun, io_req)) {
2468                                 wait_for_completion_timeout(&tm_done,
2469                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2470                         } else {
2471                                 spin_lock_irqsave(io_lock, flags);
2472                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2473                                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2474                                 io_req->abts_done = &tm_done;
2475                                 spin_unlock_irqrestore(io_lock, flags);
2476                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2477                                 "Abort and terminate issued on Device reset "
2478                                 "tag 0x%x sc 0x%p\n", tag, sc);
2479                                 break;
2480                         }
2481                 }
2482                 while (1) {
2483                         spin_lock_irqsave(io_lock, flags);
2484                         if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2485                                 spin_unlock_irqrestore(io_lock, flags);
2486                                 wait_for_completion_timeout(&tm_done,
2487                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2488                                 break;
2489                         } else {
2490                                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2491                                 io_req->abts_done = NULL;
2492                                 goto fnic_device_reset_clean;
2493                         }
2494                 }
2495         } else {
2496                 spin_unlock_irqrestore(io_lock, flags);
2497         }
2498
2499         /* Completed, but not successful, clean up the io_req, return fail */
2500         if (status != FCPIO_SUCCESS) {
2501                 spin_lock_irqsave(io_lock, flags);
2502                 FNIC_SCSI_DBG(KERN_DEBUG,
2503                               fnic->lport->host,
2504                               "Device reset completed - failed\n");
2505                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2506                 goto fnic_device_reset_clean;
2507         }
2508
2509         /*
2510          * Clean up any aborts on this lun that have still not
2511          * completed. If any of these fail, then LUN reset fails.
2512          * clean_pending_aborts cleans all cmds on this lun except
2513          * the lun reset cmd. If all cmds get cleaned, the lun reset
2514          * succeeds
2515          */
2516         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2517                 spin_lock_irqsave(io_lock, flags);
2518                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2519                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2520                               "Device reset failed"
2521                               " since could not abort all IOs\n");
2522                 goto fnic_device_reset_clean;
2523         }
2524
2525         /* Clean lun reset command */
2526         spin_lock_irqsave(io_lock, flags);
2527         io_req = (struct fnic_io_req *)CMD_SP(sc);
2528         if (io_req)
2529                 /* Completed, and successful */
2530                 ret = SUCCESS;
2531
2532 fnic_device_reset_clean:
2533         if (io_req)
2534                 CMD_SP(sc) = NULL;
2535
2536         spin_unlock_irqrestore(io_lock, flags);
2537
2538         if (io_req) {
2539                 start_time = io_req->start_time;
2540                 fnic_release_ioreq_buf(fnic, io_req, sc);
2541                 mempool_free(io_req, fnic->io_req_pool);
2542         }
2543
2544 fnic_device_reset_end:
2545         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2546                   sc->request->tag, sc,
2547                   jiffies_to_msecs(jiffies - start_time),
2548                   0, ((u64)sc->cmnd[0] << 32 |
2549                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2550                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2551                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2552
2553         /* free tag if it is allocated */
2554         if (unlikely(tag_gen_flag))
2555                 fnic_scsi_host_end_tag(fnic, sc);
2556
2557         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2558                       "Returning from device reset %s\n",
2559                       (ret == SUCCESS) ?
2560                       "SUCCESS" : "FAILED");
2561
2562         if (ret == FAILED)
2563                 atomic64_inc(&reset_stats->device_reset_failures);
2564
2565         return ret;
2566 }
2567
2568 /* Clean up all IOs, clean up libFC local port */
2569 int fnic_reset(struct Scsi_Host *shost)
2570 {
2571         struct fc_lport *lp;
2572         struct fnic *fnic;
2573         int ret = 0;
2574         struct reset_stats *reset_stats;
2575
2576         lp = shost_priv(shost);
2577         fnic = lport_priv(lp);
2578         reset_stats = &fnic->fnic_stats.reset_stats;
2579
2580         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2581                       "fnic_reset called\n");
2582
2583         atomic64_inc(&reset_stats->fnic_resets);
2584
2585         /*
2586          * Reset local port, this will clean up libFC exchanges,
2587          * reset remote port sessions, and if link is up, begin flogi
2588          */
2589         ret = fc_lport_reset(lp);
2590
2591         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2592                       "Returning from fnic reset %s\n",
2593                       (ret == 0) ?
2594                       "SUCCESS" : "FAILED");
2595
2596         if (ret == 0)
2597                 atomic64_inc(&reset_stats->fnic_reset_completions);
2598         else
2599                 atomic64_inc(&reset_stats->fnic_reset_failures);
2600
2601         return ret;
2602 }
2603
2604 /*
2605  * SCSI Error handling calls driver's eh_host_reset if all prior
2606  * error handling levels return FAILED. If host reset completes
2607  * successfully, and if link is up, then Fabric login begins.
2608  *
2609  * Host Reset is the highest level of error recovery. If this fails, then
2610  * host is offlined by SCSI.
2611  *
2612  */
2613 int fnic_host_reset(struct scsi_cmnd *sc)
2614 {
2615         int ret;
2616         unsigned long wait_host_tmo;
2617         struct Scsi_Host *shost = sc->device->host;
2618         struct fc_lport *lp = shost_priv(shost);
2619         struct fnic *fnic = lport_priv(lp);
2620         unsigned long flags;
2621
2622         spin_lock_irqsave(&fnic->fnic_lock, flags);
2623         if (fnic->internal_reset_inprogress == 0) {
2624                 fnic->internal_reset_inprogress = 1;
2625         } else {
2626                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2627                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2628                         "host reset in progress skipping another host reset\n");
2629                 return SUCCESS;
2630         }
2631         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2632
2633         /*
2634          * If fnic_reset is successful, wait for fabric login to complete
2635          * scsi-ml tries to send a TUR to every device if host reset is
2636          * successful, so before returning to scsi, fabric should be up
2637          */
2638         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2639         if (ret == SUCCESS) {
2640                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2641                 ret = FAILED;
2642                 while (time_before(jiffies, wait_host_tmo)) {
2643                         if ((lp->state == LPORT_ST_READY) &&
2644                             (lp->link_up)) {
2645                                 ret = SUCCESS;
2646                                 break;
2647                         }
2648                         ssleep(1);
2649                 }
2650         }
2651
2652         spin_lock_irqsave(&fnic->fnic_lock, flags);
2653         fnic->internal_reset_inprogress = 0;
2654         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2655         return ret;
2656 }
2657
2658 /*
2659  * This fxn is called from libFC when host is removed
2660  */
2661 void fnic_scsi_abort_io(struct fc_lport *lp)
2662 {
2663         int err = 0;
2664         unsigned long flags;
2665         enum fnic_state old_state;
2666         struct fnic *fnic = lport_priv(lp);
2667         DECLARE_COMPLETION_ONSTACK(remove_wait);
2668
2669         /* Issue firmware reset for fnic, wait for reset to complete */
2670 retry_fw_reset:
2671         spin_lock_irqsave(&fnic->fnic_lock, flags);
2672         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2673                 /* fw reset is in progress, poll for its completion */
2674                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2675                 schedule_timeout(msecs_to_jiffies(100));
2676                 goto retry_fw_reset;
2677         }
2678
2679         fnic->remove_wait = &remove_wait;
2680         old_state = fnic->state;
2681         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2682         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2683         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2684
2685         err = fnic_fw_reset_handler(fnic);
2686         if (err) {
2687                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2688                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2689                         fnic->state = old_state;
2690                 fnic->remove_wait = NULL;
2691                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2692                 return;
2693         }
2694
2695         /* Wait for firmware reset to complete */
2696         wait_for_completion_timeout(&remove_wait,
2697                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2698
2699         spin_lock_irqsave(&fnic->fnic_lock, flags);
2700         fnic->remove_wait = NULL;
2701         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2702                       "fnic_scsi_abort_io %s\n",
2703                       (fnic->state == FNIC_IN_ETH_MODE) ?
2704                       "SUCCESS" : "FAILED");
2705         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2706
2707 }
2708
2709 /*
2710  * This fxn called from libFC to clean up driver IO state on link down
2711  */
2712 void fnic_scsi_cleanup(struct fc_lport *lp)
2713 {
2714         unsigned long flags;
2715         enum fnic_state old_state;
2716         struct fnic *fnic = lport_priv(lp);
2717
2718         /* issue fw reset */
2719 retry_fw_reset:
2720         spin_lock_irqsave(&fnic->fnic_lock, flags);
2721         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2722                 /* fw reset is in progress, poll for its completion */
2723                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2724                 schedule_timeout(msecs_to_jiffies(100));
2725                 goto retry_fw_reset;
2726         }
2727         old_state = fnic->state;
2728         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2729         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2730         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2731
2732         if (fnic_fw_reset_handler(fnic)) {
2733                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2734                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2735                         fnic->state = old_state;
2736                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2737         }
2738
2739 }
2740
2741 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2742 {
2743 }
2744
2745 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2746 {
2747         struct fnic *fnic = lport_priv(lp);
2748
2749         /* Non-zero sid, nothing to do */
2750         if (sid)
2751                 goto call_fc_exch_mgr_reset;
2752
2753         if (did) {
2754                 fnic_rport_exch_reset(fnic, did);
2755                 goto call_fc_exch_mgr_reset;
2756         }
2757
2758         /*
2759          * sid = 0, did = 0
2760          * link down or device being removed
2761          */
2762         if (!fnic->in_remove)
2763                 fnic_scsi_cleanup(lp);
2764         else
2765                 fnic_scsi_abort_io(lp);
2766
2767         /* call libFC exch mgr reset to reset its exchanges */
2768 call_fc_exch_mgr_reset:
2769         fc_exch_mgr_reset(lp, sid, did);
2770
2771 }
2772
2773 /*
2774  * fnic_is_abts_pending() is a helper function that
2775  * walks through tag map to check if there is any IOs pending,if there is one,
2776  * then it returns 1 (true), otherwise 0 (false)
2777  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2778  * otherwise, it checks for all IOs.
2779  */
2780 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2781 {
2782         int tag;
2783         struct fnic_io_req *io_req;
2784         spinlock_t *io_lock;
2785         unsigned long flags;
2786         int ret = 0;
2787         struct scsi_cmnd *sc;
2788         struct scsi_device *lun_dev = NULL;
2789
2790         if (lr_sc)
2791                 lun_dev = lr_sc->device;
2792
2793         /* walk again to check, if IOs are still pending in fw */
2794         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2795                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2796                 /*
2797                  * ignore this lun reset cmd or cmds that do not belong to
2798                  * this lun
2799                  */
2800                 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc)))
2801                         continue;
2802
2803                 io_lock = fnic_io_lock_hash(fnic, sc);
2804                 spin_lock_irqsave(io_lock, flags);
2805
2806                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2807
2808                 if (!io_req || sc->device != lun_dev) {
2809                         spin_unlock_irqrestore(io_lock, flags);
2810                         continue;
2811                 }
2812
2813                 /*
2814                  * Found IO that is still pending with firmware and
2815                  * belongs to the LUN that we are resetting
2816                  */
2817                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2818                               "Found IO in %s on lun\n",
2819                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2820
2821                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2822                         ret = 1;
2823                 spin_unlock_irqrestore(io_lock, flags);
2824         }
2825
2826         return ret;
2827 }