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