drivers/scsi/lpfc/lpfc_scsi.c

   1 /*******************************************************************
   2  * This file is part of the Emulex Linux Device Driver for         *
   3  * Fibre Channel Host Bus Adapters.                                *
   4  * Copyright (C) 2004-2006 Emulex.  All rights reserved.           *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
   8  *                                                                 *
   9  * This program is free software; you can redistribute it and/or   *
  10  * modify it under the terms of version 2 of the GNU General       *
  11  * Public License as published by the Free Software Foundation.    *
  12  * This program is distributed in the hope that it will be useful. *
  13  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  14  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  15  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  16  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  17  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  18  * more details, a copy of which can be found in the file COPYING  *
  19  * included with this package.                                     *
  20  *******************************************************************/
  21
  22 #include <linux/pci.h>
  23 #include <linux/interrupt.h>
  24
  25 #include <scsi/scsi.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <scsi/scsi_transport_fc.h>
  30
  31 #include "lpfc_version.h"
  32 #include "lpfc_hw.h"
  33 #include "lpfc_sli.h"
  34 #include "lpfc_disc.h"
  35 #include "lpfc_scsi.h"
  36 #include "lpfc.h"
  37 #include "lpfc_logmsg.h"
  38 #include "lpfc_crtn.h"
  39
  40 #define LPFC_RESET_WAIT  2
  41 #define LPFC_ABORT_WAIT  2
  42
  43
  44 /*
  45  * This routine allocates a scsi buffer, which contains all the necessary
  46  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
  47  * contains information to build the IOCB.  The DMAable region contains
  48  * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
  49  * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
  50  * and the BPL BDE is setup in the IOCB.
  51  */
  52 static struct lpfc_scsi_buf *
  53 lpfc_new_scsi_buf(struct lpfc_hba * phba)
  54 {
  55         struct lpfc_scsi_buf *psb;
  56         struct ulp_bde64 *bpl;
  57         IOCB_t *iocb;
  58         dma_addr_t pdma_phys;
  59         uint16_t iotag;
  60
  61         psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
  62         if (!psb)
  63                 return NULL;
  64         memset(psb, 0, sizeof (struct lpfc_scsi_buf));
  65         psb->scsi_hba = phba;
  66
  67         /*
  68          * Get memory from the pci pool to map the virt space to pci bus space
  69          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
  70          * struct fcp_rsp and the number of bde's necessary to support the
  71          * sg_tablesize.
  72          */
  73         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
  74                                                         &psb->dma_handle);
  75         if (!psb->data) {
  76                 kfree(psb);
  77                 return NULL;
  78         }
  79
  80         /* Initialize virtual ptrs to dma_buf region. */
  81         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
  82
  83         /* Allocate iotag for psb->cur_iocbq. */
  84         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
  85         if (iotag == 0) {
  86                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
  87                               psb->data, psb->dma_handle);
  88                 kfree (psb);
  89                 return NULL;
  90         }
  91         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
  92
  93         psb->fcp_cmnd = psb->data;
  94         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
  95         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
  96                                                         sizeof(struct fcp_rsp);
  97
  98         /* Initialize local short-hand pointers. */
  99         bpl = psb->fcp_bpl;
 100         pdma_phys = psb->dma_handle;
 101
 102         /*
 103          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
 104          * list bdes.  Initialize the first two and leave the rest for
 105          * queuecommand.
 106          */
 107         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 108         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 109         bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
 110         bpl->tus.f.bdeFlags = BUFF_USE_CMND;
 111         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 112         bpl++;
 113
 114         /* Setup the physical region for the FCP RSP */
 115         pdma_phys += sizeof (struct fcp_cmnd);
 116         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 117         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 118         bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
 119         bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
 120         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 121
 122         /*
 123          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
 124          * initialize it with all known data now.
 125          */
 126         pdma_phys += (sizeof (struct fcp_rsp));
 127         iocb = &psb->cur_iocbq.iocb;
 128         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
 129         iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
 130         iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
 131         iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 132         iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
 133         iocb->ulpBdeCount = 1;
 134         iocb->ulpClass = CLASS3;
 135
 136         return psb;
 137 }
 138
 139 static struct lpfc_scsi_buf*
 140 lpfc_get_scsi_buf(struct lpfc_hba * phba)
 141 {
 142         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
 143         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
 144         unsigned long iflag = 0;
 145
 146         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 147         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
 148         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 149         return  lpfc_cmd;
 150 }
 151
 152 static void
 153 lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 154 {
 155         unsigned long iflag = 0;
 156         /*
 157          * There are only two special cases to consider.  (1) the scsi command
 158          * requested scatter-gather usage or (2) the scsi command allocated
 159          * a request buffer, but did not request use_sg.  There is a third
 160          * case, but it does not require resource deallocation.
 161          */
 162         if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
 163                 dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
 164                                 psb->seg_cnt, psb->pCmd->sc_data_direction);
 165         } else {
 166                  if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
 167                         dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
 168                                                 psb->pCmd->request_bufflen,
 169                                                 psb->pCmd->sc_data_direction);
 170                  }
 171         }
 172
 173         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 174         psb->pCmd = NULL;
 175         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
 176         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 177 }
 178
 179 static int
 180 lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
 181 {
 182         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 183         struct scatterlist *sgel = NULL;
 184         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 185         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
 186         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 187         dma_addr_t physaddr;
 188         uint32_t i, num_bde = 0;
 189         int datadir = scsi_cmnd->sc_data_direction;
 190         int dma_error;
 191
 192         /*
 193          * There are three possibilities here - use scatter-gather segment, use
 194          * the single mapping, or neither.  Start the lpfc command prep by
 195          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 196          * data bde entry.
 197          */
 198         bpl += 2;
 199         if (scsi_cmnd->use_sg) {
 200                 /*
 201                  * The driver stores the segment count returned from pci_map_sg
 202                  * because this a count of dma-mappings used to map the use_sg
 203                  * pages.  They are not guaranteed to be the same for those
 204                  * architectures that implement an IOMMU.
 205                  */
 206                 sgel = (struct scatterlist *)scsi_cmnd->request_buffer;
 207                 lpfc_cmd->seg_cnt = dma_map_sg(&phba->pcidev->dev, sgel,
 208                                                 scsi_cmnd->use_sg, datadir);
 209                 if (lpfc_cmd->seg_cnt == 0)
 210                         return 1;
 211
 212                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
 213                         printk(KERN_ERR "%s: Too many sg segments from "
 214                                "dma_map_sg.  Config %d, seg_cnt %d",
 215                                __FUNCTION__, phba->cfg_sg_seg_cnt,
 216                                lpfc_cmd->seg_cnt);
 217                         dma_unmap_sg(&phba->pcidev->dev, sgel,
 218                                      lpfc_cmd->seg_cnt, datadir);
 219                         return 1;
 220                 }
 221
 222                 /*
 223                  * The driver established a maximum scatter-gather segment count
 224                  * during probe that limits the number of sg elements in any
 225                  * single scsi command.  Just run through the seg_cnt and format
 226                  * the bde's.
 227                  */
 228                 for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
 229                         physaddr = sg_dma_address(sgel);
 230                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 231                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 232                         bpl->tus.f.bdeSize = sg_dma_len(sgel);
 233                         if (datadir == DMA_TO_DEVICE)
 234                                 bpl->tus.f.bdeFlags = 0;
 235                         else
 236                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 237                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 238                         bpl++;
 239                         sgel++;
 240                         num_bde++;
 241                 }
 242         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 243                 physaddr = dma_map_single(&phba->pcidev->dev,
 244                                           scsi_cmnd->request_buffer,
 245                                           scsi_cmnd->request_bufflen,
 246                                           datadir);
 247                 dma_error = dma_mapping_error(physaddr);
 248                 if (dma_error) {
 249                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 250                                 "%d:0718 Unable to dma_map_single "
 251                                 "request_buffer: x%x\n",
 252                                 phba->brd_no, dma_error);
 253                         return 1;
 254                 }
 255
 256                 lpfc_cmd->nonsg_phys = physaddr;
 257                 bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 258                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 259                 bpl->tus.f.bdeSize = scsi_cmnd->request_bufflen;
 260                 if (datadir == DMA_TO_DEVICE)
 261                         bpl->tus.f.bdeFlags = 0;
 262                 else
 263                         bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 264                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
 265                 num_bde = 1;
 266                 bpl++;
 267         }
 268
 269         /*
 270          * Finish initializing those IOCB fields that are dependent on the
 271          * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
 272          * reinitialized since all iocb memory resources are used many times
 273          * for transmit, receive, and continuation bpl's.
 274          */
 275         iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 276         iocb_cmd->un.fcpi64.bdl.bdeSize +=
 277                 (num_bde * sizeof (struct ulp_bde64));
 278         iocb_cmd->ulpBdeCount = 1;
 279         iocb_cmd->ulpLe = 1;
 280         fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
 281         return 0;
 282 }
 283
 284 static void
 285 lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
 286 {
 287         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 288         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
 289         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 290         struct lpfc_hba *phba = lpfc_cmd->scsi_hba;
 291         uint32_t fcpi_parm = lpfc_cmd->cur_iocbq.iocb.un.fcpi.fcpi_parm;
 292         uint32_t resp_info = fcprsp->rspStatus2;
 293         uint32_t scsi_status = fcprsp->rspStatus3;
 294         uint32_t host_status = DID_OK;
 295         uint32_t rsplen = 0;
 296
 297         /*
 298          *  If this is a task management command, there is no
 299          *  scsi packet associated with this lpfc_cmd.  The driver
 300          *  consumes it.
 301          */
 302         if (fcpcmd->fcpCntl2) {
 303                 scsi_status = 0;
 304                 goto out;
 305         }
 306
 307         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 308                         "%d:0730 FCP command failed: RSP "
 309                         "Data: x%x x%x x%x x%x x%x x%x\n",
 310                         phba->brd_no, resp_info, scsi_status,
 311                         be32_to_cpu(fcprsp->rspResId),
 312                         be32_to_cpu(fcprsp->rspSnsLen),
 313                         be32_to_cpu(fcprsp->rspRspLen),
 314                         fcprsp->rspInfo3);
 315
 316         if (resp_info & RSP_LEN_VALID) {
 317                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
 318                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
 319                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
 320                         host_status = DID_ERROR;
 321                         goto out;
 322                 }
 323         }
 324
 325         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
 326                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
 327                 if (snslen > SCSI_SENSE_BUFFERSIZE)
 328                         snslen = SCSI_SENSE_BUFFERSIZE;
 329
 330                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
 331         }
 332
 333         cmnd->resid = 0;
 334         if (resp_info & RESID_UNDER) {
 335                 cmnd->resid = be32_to_cpu(fcprsp->rspResId);
 336
 337                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 338                                 "%d:0716 FCP Read Underrun, expected %d, "
 339                                 "residual %d Data: x%x x%x x%x\n", phba->brd_no,
 340                                 be32_to_cpu(fcpcmd->fcpDl), cmnd->resid,
 341                                 fcpi_parm, cmnd->cmnd[0], cmnd->underflow);
 342
 343                 /*
 344                  * The cmnd->underflow is the minimum number of bytes that must
 345                  * be transfered for this command.  Provided a sense condition
 346                  * is not present, make sure the actual amount transferred is at
 347                  * least the underflow value or fail.
 348                  */
 349                 if (!(resp_info & SNS_LEN_VALID) &&
 350                     (scsi_status == SAM_STAT_GOOD) &&
 351                     (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
 352                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 353                                         "%d:0717 FCP command x%x residual "
 354                                         "underrun converted to error "
 355                                         "Data: x%x x%x x%x\n", phba->brd_no,
 356                                         cmnd->cmnd[0], cmnd->request_bufflen,
 357                                         cmnd->resid, cmnd->underflow);
 358
 359                         host_status = DID_ERROR;
 360                 }
 361         } else if (resp_info & RESID_OVER) {
 362                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 363                                 "%d:0720 FCP command x%x residual "
 364                                 "overrun error. Data: x%x x%x \n",
 365                                 phba->brd_no, cmnd->cmnd[0],
 366                                 cmnd->request_bufflen, cmnd->resid);
 367                 host_status = DID_ERROR;
 368
 369         /*
 370          * Check SLI validation that all the transfer was actually done
 371          * (fcpi_parm should be zero). Apply check only to reads.
 372          */
 373         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
 374                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
 375                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 376                         "%d:0734 FCP Read Check Error Data: "
 377                         "x%x x%x x%x x%x\n", phba->brd_no,
 378                         be32_to_cpu(fcpcmd->fcpDl),
 379                         be32_to_cpu(fcprsp->rspResId),
 380                         fcpi_parm, cmnd->cmnd[0]);
 381                 host_status = DID_ERROR;
 382                 cmnd->resid = cmnd->request_bufflen;
 383         }
 384
 385  out:
 386         cmnd->result = ScsiResult(host_status, scsi_status);
 387 }
 388
 389 static void
 390 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 391                         struct lpfc_iocbq *pIocbOut)
 392 {
 393         struct lpfc_scsi_buf *lpfc_cmd =
 394                 (struct lpfc_scsi_buf *) pIocbIn->context1;
 395         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 396         struct lpfc_nodelist *pnode = rdata->pnode;
 397         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
 398         int result;
 399         struct scsi_device *sdev, *tmp_sdev;
 400         int depth = 0;
 401
 402         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 403         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 404
 405         if (lpfc_cmd->status) {
 406                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 407                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 408                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 409                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 410                         lpfc_cmd->status = IOSTAT_DEFAULT;
 411
 412                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 413                                 "%d:0729 FCP cmd x%x failed <%d/%d> status: "
 414                                 "x%x result: x%x Data: x%x x%x\n",
 415                                 phba->brd_no, cmd->cmnd[0], cmd->device->id,
 416                                 cmd->device->lun, lpfc_cmd->status,
 417                                 lpfc_cmd->result, pIocbOut->iocb.ulpContext,
 418                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 419
 420                 switch (lpfc_cmd->status) {
 421                 case IOSTAT_FCP_RSP_ERROR:
 422                         /* Call FCP RSP handler to determine result */
 423                         lpfc_handle_fcp_err(lpfc_cmd);
 424                         break;
 425                 case IOSTAT_NPORT_BSY:
 426                 case IOSTAT_FABRIC_BSY:
 427                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
 428                         break;
 429                 default:
 430                         cmd->result = ScsiResult(DID_ERROR, 0);
 431                         break;
 432                 }
 433
 434                 if ((pnode == NULL )
 435                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
 436                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
 437         } else {
 438                 cmd->result = ScsiResult(DID_OK, 0);
 439         }
 440
 441         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
 442                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
 443
 444                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 445                                 "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
 446                                 "SNS x%x x%x Data: x%x x%x\n",
 447                                 phba->brd_no, cmd->device->id,
 448                                 cmd->device->lun, cmd, cmd->result,
 449                                 *lp, *(lp + 3), cmd->retries, cmd->resid);
 450         }
 451
 452         result = cmd->result;
 453         sdev = cmd->device;
 454         cmd->scsi_done(cmd);
 455
 456         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 457                 lpfc_release_scsi_buf(phba, lpfc_cmd);
 458                 return;
 459         }
 460
 461         if (!result && pnode != NULL &&
 462            ((jiffies - pnode->last_ramp_up_time) >
 463                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 464            ((jiffies - pnode->last_q_full_time) >
 465                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 466            (phba->cfg_lun_queue_depth > sdev->queue_depth)) {
 467                 shost_for_each_device(tmp_sdev, sdev->host) {
 468                         if (phba->cfg_lun_queue_depth > tmp_sdev->queue_depth) {
 469                                 if (tmp_sdev->id != sdev->id)
 470                                         continue;
 471                                 if (tmp_sdev->ordered_tags)
 472                                         scsi_adjust_queue_depth(tmp_sdev,
 473                                                 MSG_ORDERED_TAG,
 474                                                 tmp_sdev->queue_depth+1);
 475                                 else
 476                                         scsi_adjust_queue_depth(tmp_sdev,
 477                                                 MSG_SIMPLE_TAG,
 478                                                 tmp_sdev->queue_depth+1);
 479
 480                                 pnode->last_ramp_up_time = jiffies;
 481                         }
 482                 }
 483         }
 484
 485         /*
 486          * Check for queue full.  If the lun is reporting queue full, then
 487          * back off the lun queue depth to prevent target overloads.
 488          */
 489         if (result == SAM_STAT_TASK_SET_FULL && pnode != NULL) {
 490                 pnode->last_q_full_time = jiffies;
 491
 492                 shost_for_each_device(tmp_sdev, sdev->host) {
 493                         if (tmp_sdev->id != sdev->id)
 494                                 continue;
 495                         depth = scsi_track_queue_full(tmp_sdev,
 496                                         tmp_sdev->queue_depth - 1);
 497                 }
 498                 /*
 499                  * The queue depth cannot be lowered any more.
 500                  * Modify the returned error code to store
 501                  * the final depth value set by
 502                  * scsi_track_queue_full.
 503                  */
 504                 if (depth == -1)
 505                         depth = sdev->host->cmd_per_lun;
 506
 507                 if (depth) {
 508                         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 509                                 "%d:0711 detected queue full - lun queue depth "
 510                                 " adjusted to %d.\n", phba->brd_no, depth);
 511                 }
 512         }
 513
 514         lpfc_release_scsi_buf(phba, lpfc_cmd);
 515 }
 516
 517 static void
 518 lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
 519                         struct lpfc_nodelist *pnode)
 520 {
 521         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 522         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 523         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 524         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
 525         int datadir = scsi_cmnd->sc_data_direction;
 526
 527         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
 528         /* clear task management bits */
 529         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
 530
 531         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 532                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 533
 534         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
 535
 536         if (scsi_cmnd->device->tagged_supported) {
 537                 switch (scsi_cmnd->tag) {
 538                 case HEAD_OF_QUEUE_TAG:
 539                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
 540                         break;
 541                 case ORDERED_QUEUE_TAG:
 542                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
 543                         break;
 544                 default:
 545                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
 546                         break;
 547                 }
 548         } else
 549                 fcp_cmnd->fcpCntl1 = 0;
 550
 551         /*
 552          * There are three possibilities here - use scatter-gather segment, use
 553          * the single mapping, or neither.  Start the lpfc command prep by
 554          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 555          * data bde entry.
 556          */
 557         if (scsi_cmnd->use_sg) {
 558                 if (datadir == DMA_TO_DEVICE) {
 559                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 560                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 561                         iocb_cmd->ulpPU = 0;
 562                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 563                         phba->fc4OutputRequests++;
 564                 } else {
 565                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 566                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 567                         iocb_cmd->un.fcpi.fcpi_parm =
 568                                 scsi_cmnd->request_bufflen;
 569                         fcp_cmnd->fcpCntl3 = READ_DATA;
 570                         phba->fc4InputRequests++;
 571                 }
 572         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 573                 if (datadir == DMA_TO_DEVICE) {
 574                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 575                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 576                         iocb_cmd->ulpPU = 0;
 577                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 578                         phba->fc4OutputRequests++;
 579                 } else {
 580                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 581                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 582                         iocb_cmd->un.fcpi.fcpi_parm =
 583                                 scsi_cmnd->request_bufflen;
 584                         fcp_cmnd->fcpCntl3 = READ_DATA;
 585                         phba->fc4InputRequests++;
 586                 }
 587         } else {
 588                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
 589                 iocb_cmd->un.fcpi.fcpi_parm = 0;
 590                 iocb_cmd->ulpPU = 0;
 591                 fcp_cmnd->fcpCntl3 = 0;
 592                 phba->fc4ControlRequests++;
 593         }
 594
 595         /*
 596          * Finish initializing those IOCB fields that are independent
 597          * of the scsi_cmnd request_buffer
 598          */
 599         piocbq->iocb.ulpContext = pnode->nlp_rpi;
 600         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
 601                 piocbq->iocb.ulpFCP2Rcvy = 1;
 602
 603         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
 604         piocbq->context1  = lpfc_cmd;
 605         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
 606         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
 607 }
 608
 609 static int
 610 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
 611                              struct lpfc_scsi_buf *lpfc_cmd,
 612                              uint8_t task_mgmt_cmd)
 613 {
 614         struct lpfc_sli *psli;
 615         struct lpfc_iocbq *piocbq;
 616         IOCB_t *piocb;
 617         struct fcp_cmnd *fcp_cmnd;
 618         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 619         struct lpfc_nodelist *ndlp = rdata->pnode;
 620
 621         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
 622                 return 0;
 623         }
 624
 625         psli = &phba->sli;
 626         piocbq = &(lpfc_cmd->cur_iocbq);
 627         piocb = &piocbq->iocb;
 628
 629         fcp_cmnd = lpfc_cmd->fcp_cmnd;
 630         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 631                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 632         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
 633
 634         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
 635
 636         piocb->ulpContext = ndlp->nlp_rpi;
 637         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
 638                 piocb->ulpFCP2Rcvy = 1;
 639         }
 640         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
 641
 642         /* ulpTimeout is only one byte */
 643         if (lpfc_cmd->timeout > 0xff) {
 644                 /*
 645                  * Do not timeout the command at the firmware level.
 646                  * The driver will provide the timeout mechanism.
 647                  */
 648                 piocb->ulpTimeout = 0;
 649         } else {
 650                 piocb->ulpTimeout = lpfc_cmd->timeout;
 651         }
 652
 653         return (1);
 654 }
 655
 656 static int
 657 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba,
 658                     unsigned  tgt_id, struct lpfc_rport_data *rdata)
 659 {
 660         struct lpfc_iocbq *iocbq;
 661         struct lpfc_iocbq *iocbqrsp;
 662         int ret;
 663
 664         lpfc_cmd->rdata = rdata;
 665         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_TARGET_RESET);
 666         if (!ret)
 667                 return FAILED;
 668
 669         lpfc_cmd->scsi_hba = phba;
 670         iocbq = &lpfc_cmd->cur_iocbq;
 671         iocbqrsp = lpfc_sli_get_iocbq(phba);
 672
 673         if (!iocbqrsp)
 674                 return FAILED;
 675
 676         /* Issue Target Reset to TGT <num> */
 677         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 678                         "%d:0702 Issue Target Reset to TGT %d "
 679                         "Data: x%x x%x\n",
 680                         phba->brd_no, tgt_id, rdata->pnode->nlp_rpi,
 681                         rdata->pnode->nlp_flag);
 682
 683         ret = lpfc_sli_issue_iocb_wait(phba,
 684                                        &phba->sli.ring[phba->sli.fcp_ring],
 685                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 686         if (ret != IOCB_SUCCESS) {
 687                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 688                 ret = FAILED;
 689         } else {
 690                 ret = SUCCESS;
 691                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 692                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 693                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 694                         (lpfc_cmd->result & IOERR_DRVR_MASK))
 695                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 696         }
 697
 698         lpfc_sli_release_iocbq(phba, iocbqrsp);
 699         return ret;
 700 }
 701
 702 const char *
 703 lpfc_info(struct Scsi_Host *host)
 704 {
 705         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata;
 706         int len;
 707         static char  lpfcinfobuf[384];
 708
 709         memset(lpfcinfobuf,0,384);
 710         if (phba && phba->pcidev){
 711                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
 712                 len = strlen(lpfcinfobuf);
 713                 snprintf(lpfcinfobuf + len,
 714                         384-len,
 715                         " on PCI bus %02x device %02x irq %d",
 716                         phba->pcidev->bus->number,
 717                         phba->pcidev->devfn,
 718                         phba->pcidev->irq);
 719                 len = strlen(lpfcinfobuf);
 720                 if (phba->Port[0]) {
 721                         snprintf(lpfcinfobuf + len,
 722                                  384-len,
 723                                  " port %s",
 724                                  phba->Port);
 725                 }
 726         }
 727         return lpfcinfobuf;
 728 }
 729
 730 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
 731 {
 732         unsigned long  poll_tmo_expires =
 733                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
 734
 735         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
 736                 mod_timer(&phba->fcp_poll_timer,
 737                           poll_tmo_expires);
 738 }
 739
 740 void lpfc_poll_start_timer(struct lpfc_hba * phba)
 741 {
 742         lpfc_poll_rearm_timer(phba);
 743 }
 744
 745 void lpfc_poll_timeout(unsigned long ptr)
 746 {
 747         struct lpfc_hba *phba = (struct lpfc_hba *)ptr;
 748         unsigned long iflag;
 749
 750         spin_lock_irqsave(phba->host->host_lock, iflag);
 751
 752         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 753                 lpfc_sli_poll_fcp_ring (phba);
 754                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 755                         lpfc_poll_rearm_timer(phba);
 756         }
 757
 758         spin_unlock_irqrestore(phba->host->host_lock, iflag);
 759 }
 760
 761 static int
 762 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 763 {
 764         struct lpfc_hba *phba =
 765                 (struct lpfc_hba *) cmnd->device->host->hostdata;
 766         struct lpfc_sli *psli = &phba->sli;
 767         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 768         struct lpfc_nodelist *ndlp = rdata->pnode;
 769         struct lpfc_scsi_buf *lpfc_cmd;
 770         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 771         int err;
 772
 773         err = fc_remote_port_chkready(rport);
 774         if (err) {
 775                 cmnd->result = err;
 776                 goto out_fail_command;
 777         }
 778
 779         /*
 780          * Catch race where our node has transitioned, but the
 781          * transport is still transitioning.
 782          */
 783         if (!ndlp) {
 784                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
 785                 goto out_fail_command;
 786         }
 787         lpfc_cmd = lpfc_get_scsi_buf (phba);
 788         if (lpfc_cmd == NULL) {
 789                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 790                                 "%d:0707 driver's buffer pool is empty, "
 791                                 "IO busied\n", phba->brd_no);
 792                 goto out_host_busy;
 793         }
 794
 795         /*
 796          * Store the midlayer's command structure for the completion phase
 797          * and complete the command initialization.
 798          */
 799         lpfc_cmd->pCmd  = cmnd;
 800         lpfc_cmd->rdata = rdata;
 801         lpfc_cmd->timeout = 0;
 802         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
 803         cmnd->scsi_done = done;
 804
 805         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
 806         if (err)
 807                 goto out_host_busy_free_buf;
 808
 809         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
 810
 811         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
 812                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
 813         if (err)
 814                 goto out_host_busy_free_buf;
 815
 816         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 817                 lpfc_sli_poll_fcp_ring(phba);
 818                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 819                         lpfc_poll_rearm_timer(phba);
 820         }
 821
 822         return 0;
 823
 824  out_host_busy_free_buf:
 825         lpfc_release_scsi_buf(phba, lpfc_cmd);
 826  out_host_busy:
 827         return SCSI_MLQUEUE_HOST_BUSY;
 828
 829  out_fail_command:
 830         done(cmnd);
 831         return 0;
 832 }
 833
 834
 835 static int
 836 lpfc_abort_handler(struct scsi_cmnd *cmnd)
 837 {
 838         struct Scsi_Host *shost = cmnd->device->host;
 839         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 840         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
 841         struct lpfc_iocbq *iocb;
 842         struct lpfc_iocbq *abtsiocb;
 843         struct lpfc_scsi_buf *lpfc_cmd;
 844         IOCB_t *cmd, *icmd;
 845         unsigned int loop_count = 0;
 846         int ret = SUCCESS;
 847
 848         spin_lock_irq(shost->host_lock);
 849
 850         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
 851         BUG_ON(!lpfc_cmd);
 852
 853         /*
 854          * If pCmd field of the corresponding lpfc_scsi_buf structure
 855          * points to a different SCSI command, then the driver has
 856          * already completed this command, but the midlayer did not
 857          * see the completion before the eh fired.  Just return
 858          * SUCCESS.
 859          */
 860         iocb = &lpfc_cmd->cur_iocbq;
 861         if (lpfc_cmd->pCmd != cmnd)
 862                 goto out;
 863
 864         BUG_ON(iocb->context1 != lpfc_cmd);
 865
 866         abtsiocb = lpfc_sli_get_iocbq(phba);
 867         if (abtsiocb == NULL) {
 868                 ret = FAILED;
 869                 goto out;
 870         }
 871
 872         /*
 873          * The scsi command can not be in txq and it is in flight because the
 874          * pCmd is still pointig at the SCSI command we have to abort. There
 875          * is no need to search the txcmplq. Just send an abort to the FW.
 876          */
 877
 878         cmd = &iocb->iocb;
 879         icmd = &abtsiocb->iocb;
 880         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
 881         icmd->un.acxri.abortContextTag = cmd->ulpContext;
 882         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
 883
 884         icmd->ulpLe = 1;
 885         icmd->ulpClass = cmd->ulpClass;
 886         if (phba->hba_state >= LPFC_LINK_UP)
 887                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
 888         else
 889                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
 890
 891         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
 892         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
 893                 lpfc_sli_release_iocbq(phba, abtsiocb);
 894                 ret = FAILED;
 895                 goto out;
 896         }
 897
 898         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 899                 lpfc_sli_poll_fcp_ring (phba);
 900
 901         /* Wait for abort to complete */
 902         while (lpfc_cmd->pCmd == cmnd)
 903         {
 904                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 905                         lpfc_sli_poll_fcp_ring (phba);
 906
 907                 spin_unlock_irq(phba->host->host_lock);
 908                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
 909                 spin_lock_irq(phba->host->host_lock);
 910                 if (++loop_count
 911                     > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
 912                         break;
 913         }
 914
 915         if (lpfc_cmd->pCmd == cmnd) {
 916                 ret = FAILED;
 917                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 918                                 "%d:0748 abort handler timed out waiting for "
 919                                 "abort to complete: ret %#x, ID %d, LUN %d, "
 920                                 "snum %#lx\n",
 921                                 phba->brd_no,  ret, cmnd->device->id,
 922                                 cmnd->device->lun, cmnd->serial_number);
 923         }
 924
 925  out:
 926         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 927                         "%d:0749 SCSI Layer I/O Abort Request "
 928                         "Status x%x ID %d LUN %d snum %#lx\n",
 929                         phba->brd_no, ret, cmnd->device->id,
 930                         cmnd->device->lun, cmnd->serial_number);
 931
 932         spin_unlock_irq(shost->host_lock);
 933
 934         return ret;
 935 }
 936
 937 static int
 938 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 939 {
 940         struct Scsi_Host *shost = cmnd->device->host;
 941         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 942         struct lpfc_scsi_buf *lpfc_cmd;
 943         struct lpfc_iocbq *iocbq, *iocbqrsp;
 944         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 945         struct lpfc_nodelist *pnode = rdata->pnode;
 946         uint32_t cmd_result = 0, cmd_status = 0;
 947         int ret = FAILED;
 948         int cnt, loopcnt;
 949
 950         spin_lock_irq(shost->host_lock);
 951         /*
 952          * If target is not in a MAPPED state, delay the reset until
 953          * target is rediscovered or nodev timeout expires.
 954          */
 955         while ( 1 ) {
 956                 if (!pnode)
 957                         break;
 958
 959                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
 960                         spin_unlock_irq(phba->host->host_lock);
 961                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
 962                         spin_lock_irq(phba->host->host_lock);
 963                 }
 964                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
 965                         break;
 966         }
 967
 968         lpfc_cmd = lpfc_get_scsi_buf (phba);
 969         if (lpfc_cmd == NULL)
 970                 goto out;
 971
 972         lpfc_cmd->pCmd = cmnd;
 973         lpfc_cmd->timeout = 60;
 974         lpfc_cmd->scsi_hba = phba;
 975         lpfc_cmd->rdata = rdata;
 976
 977         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_LUN_RESET);
 978         if (!ret)
 979                 goto out_free_scsi_buf;
 980
 981         iocbq = &lpfc_cmd->cur_iocbq;
 982
 983         /* get a buffer for this IOCB command response */
 984         iocbqrsp = lpfc_sli_get_iocbq(phba);
 985         if (iocbqrsp == NULL)
 986                 goto out_free_scsi_buf;
 987
 988         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 989                         "%d:0703 Issue LUN Reset to TGT %d LUN %d "
 990                         "Data: x%x x%x\n", phba->brd_no, cmnd->device->id,
 991                         cmnd->device->lun, pnode->nlp_rpi, pnode->nlp_flag);
 992
 993         ret = lpfc_sli_issue_iocb_wait(phba,
 994                                        &phba->sli.ring[phba->sli.fcp_ring],
 995                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 996         if (ret == IOCB_SUCCESS)
 997                 ret = SUCCESS;
 998
 999
1000         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
1001         cmd_status = iocbqrsp->iocb.ulpStatus;
1002
1003         lpfc_sli_release_iocbq(phba, iocbqrsp);
1004         lpfc_release_scsi_buf(phba, lpfc_cmd);
1005
1006         /*
1007          * All outstanding txcmplq I/Os should have been aborted by the device.
1008          * Unfortunately, some targets do not abide by this forcing the driver
1009          * to double check.
1010          */
1011         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1012                                 cmnd->device->id, cmnd->device->lun,
1013                                 LPFC_CTX_LUN);
1014         if (cnt)
1015                 lpfc_sli_abort_iocb(phba,
1016                                     &phba->sli.ring[phba->sli.fcp_ring],
1017                                     cmnd->device->id, cmnd->device->lun,
1018                                     0, LPFC_CTX_LUN);
1019         loopcnt = 0;
1020         while(cnt) {
1021                 spin_unlock_irq(phba->host->host_lock);
1022                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1023                 spin_lock_irq(phba->host->host_lock);
1024
1025                 if (++loopcnt
1026                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1027                         break;
1028
1029                 cnt = lpfc_sli_sum_iocb(phba,
1030                                         &phba->sli.ring[phba->sli.fcp_ring],
1031                                         cmnd->device->id, cmnd->device->lun,
1032                                         LPFC_CTX_LUN);
1033         }
1034
1035         if (cnt) {
1036                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1037                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
1038                         phba->brd_no, cnt);
1039                 ret = FAILED;
1040         }
1041
1042 out_free_scsi_buf:
1043         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1044                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
1045                         "Data: x%x x%x x%x\n",
1046                         phba->brd_no, cmnd->device->id,cmnd->device->lun,
1047                         ret, cmd_status, cmd_result);
1048
1049 out:
1050         spin_unlock_irq(shost->host_lock);
1051         return ret;
1052 }
1053
1054 static int
1055 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1056 {
1057         struct Scsi_Host *shost = cmnd->device->host;
1058         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
1059         struct lpfc_nodelist *ndlp = NULL;
1060         int match;
1061         int ret = FAILED, i, err_count = 0;
1062         int cnt, loopcnt;
1063         struct lpfc_scsi_buf * lpfc_cmd;
1064
1065         spin_lock_irq(shost->host_lock);
1066
1067         lpfc_cmd = lpfc_get_scsi_buf(phba);
1068         if (lpfc_cmd == NULL)
1069                 goto out;
1070
1071         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1072         lpfc_cmd->timeout = 60;
1073         lpfc_cmd->pCmd = cmnd;
1074         lpfc_cmd->scsi_hba = phba;
1075
1076         /*
1077          * Since the driver manages a single bus device, reset all
1078          * targets known to the driver.  Should any target reset
1079          * fail, this routine returns failure to the midlayer.
1080          */
1081         for (i = 0; i < MAX_FCP_TARGET; i++) {
1082                 /* Search the mapped list for this target ID */
1083                 match = 0;
1084                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1085                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1086                                 match = 1;
1087                                 break;
1088                         }
1089                 }
1090                 if (!match)
1091                         continue;
1092
1093                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba,
1094                                           i, ndlp->rport->dd_data);
1095                 if (ret != SUCCESS) {
1096                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1097                                 "%d:0713 Bus Reset on target %d failed\n",
1098                                 phba->brd_no, i);
1099                         err_count++;
1100                 }
1101         }
1102
1103         if (err_count == 0)
1104                 ret = SUCCESS;
1105
1106         lpfc_release_scsi_buf(phba, lpfc_cmd);
1107
1108         /*
1109          * All outstanding txcmplq I/Os should have been aborted by
1110          * the targets.  Unfortunately, some targets do not abide by
1111          * this forcing the driver to double check.
1112          */
1113         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1114                                 0, 0, LPFC_CTX_HOST);
1115         if (cnt)
1116                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1117                                     0, 0, 0, LPFC_CTX_HOST);
1118         loopcnt = 0;
1119         while(cnt) {
1120                 spin_unlock_irq(phba->host->host_lock);
1121                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1122                 spin_lock_irq(phba->host->host_lock);
1123
1124                 if (++loopcnt
1125                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1126                         break;
1127
1128                 cnt = lpfc_sli_sum_iocb(phba,
1129                                         &phba->sli.ring[phba->sli.fcp_ring],
1130                                         0, 0, LPFC_CTX_HOST);
1131         }
1132
1133         if (cnt) {
1134                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1135                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1136                    phba->brd_no, cnt, i);
1137                 ret = FAILED;
1138         }
1139
1140         lpfc_printf_log(phba,
1141                         KERN_ERR,
1142                         LOG_FCP,
1143                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1144                         phba->brd_no, ret);
1145 out:
1146         spin_unlock_irq(shost->host_lock);
1147         return ret;
1148 }
1149
1150 static int
1151 lpfc_slave_alloc(struct scsi_device *sdev)
1152 {
1153         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata;
1154         struct lpfc_scsi_buf *scsi_buf = NULL;
1155         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1156         uint32_t total = 0, i;
1157         uint32_t num_to_alloc = 0;
1158         unsigned long flags;
1159
1160         if (!rport || fc_remote_port_chkready(rport))
1161                 return -ENXIO;
1162
1163         sdev->hostdata = rport->dd_data;
1164
1165         /*
1166          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1167          * available list of scsi buffers.  Don't allocate more than the
1168          * HBA limit conveyed to the midlayer via the host structure.  The
1169          * formula accounts for the lun_queue_depth + error handlers + 1
1170          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1171          */
1172         total = phba->total_scsi_bufs;
1173         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1174         if (total >= phba->cfg_hba_queue_depth) {
1175                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1176                                 "%d:0704 At limitation of %d preallocated "
1177                                 "command buffers\n", phba->brd_no, total);
1178                 return 0;
1179         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1180                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1181                                 "%d:0705 Allocation request of %d command "
1182                                 "buffers will exceed max of %d.  Reducing "
1183                                 "allocation request to %d.\n", phba->brd_no,
1184                                 num_to_alloc, phba->cfg_hba_queue_depth,
1185                                 (phba->cfg_hba_queue_depth - total));
1186                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1187         }
1188
1189         for (i = 0; i < num_to_alloc; i++) {
1190                 scsi_buf = lpfc_new_scsi_buf(phba);
1191                 if (!scsi_buf) {
1192                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1193                                         "%d:0706 Failed to allocate command "
1194                                         "buffer\n", phba->brd_no);
1195                         break;
1196                 }
1197
1198                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1199                 phba->total_scsi_bufs++;
1200                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1201                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1202         }
1203         return 0;
1204 }
1205
1206 static int
1207 lpfc_slave_configure(struct scsi_device *sdev)
1208 {
1209         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata;
1210         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1211
1212         if (sdev->tagged_supported)
1213                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1214         else
1215                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1216
1217         /*
1218          * Initialize the fc transport attributes for the target
1219          * containing this scsi device.  Also note that the driver's
1220          * target pointer is stored in the starget_data for the
1221          * driver's sysfs entry point functions.
1222          */
1223         rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;
1224
1225         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1226                 lpfc_sli_poll_fcp_ring(phba);
1227                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1228                         lpfc_poll_rearm_timer(phba);
1229         }
1230
1231         return 0;
1232 }
1233
1234 static void
1235 lpfc_slave_destroy(struct scsi_device *sdev)
1236 {
1237         sdev->hostdata = NULL;
1238         return;
1239 }
1240
1241 struct scsi_host_template lpfc_template = {
1242         .module                 = THIS_MODULE,
1243         .name                   = LPFC_DRIVER_NAME,
1244         .info                   = lpfc_info,
1245         .queuecommand           = lpfc_queuecommand,
1246         .eh_abort_handler       = lpfc_abort_handler,
1247         .eh_device_reset_handler= lpfc_reset_lun_handler,
1248         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1249         .slave_alloc            = lpfc_slave_alloc,
1250         .slave_configure        = lpfc_slave_configure,
1251         .slave_destroy          = lpfc_slave_destroy,
1252         .this_id                = -1,
1253         .sg_tablesize           = LPFC_SG_SEG_CNT,
1254         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1255         .use_clustering         = ENABLE_CLUSTERING,
1256         .shost_attrs            = lpfc_host_attrs,
1257         .max_sectors            = 0xFFFF,
1258 };