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