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) 2004-2005 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 static inline void
  45 lpfc_block_requests(struct lpfc_hba * phba)
  46 {
  47         down(&phba->hba_can_block);
  48         scsi_block_requests(phba->host);
  49 }
  50
  51 static inline void
  52 lpfc_unblock_requests(struct lpfc_hba * phba)
  53 {
  54         scsi_unblock_requests(phba->host);
  55         up(&phba->hba_can_block);
  56 }
  57
  58 /*
  59  * This routine allocates a scsi buffer, which contains all the necessary
  60  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
  61  * contains information to build the IOCB.  The DMAable region contains
  62  * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
  63  * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
  64  * and the BPL BDE is setup in the IOCB.
  65  */
  66 static struct lpfc_scsi_buf *
  67 lpfc_new_scsi_buf(struct lpfc_hba * phba)
  68 {
  69         struct lpfc_scsi_buf *psb;
  70         struct ulp_bde64 *bpl;
  71         IOCB_t *iocb;
  72         dma_addr_t pdma_phys;
  73         uint16_t iotag;
  74
  75         psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
  76         if (!psb)
  77                 return NULL;
  78         memset(psb, 0, sizeof (struct lpfc_scsi_buf));
  79         psb->scsi_hba = phba;
  80
  81         /*
  82          * Get memory from the pci pool to map the virt space to pci bus space
  83          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
  84          * struct fcp_rsp and the number of bde's necessary to support the
  85          * sg_tablesize.
  86          */
  87         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
  88                                                         &psb->dma_handle);
  89         if (!psb->data) {
  90                 kfree(psb);
  91                 return NULL;
  92         }
  93
  94         /* Initialize virtual ptrs to dma_buf region. */
  95         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
  96
  97         /* Allocate iotag for psb->cur_iocbq. */
  98         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
  99         if (iotag == 0) {
 100                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
 101                               psb->data, psb->dma_handle);
 102                 kfree (psb);
 103                 return NULL;
 104         }
 105         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
 106
 107         psb->fcp_cmnd = psb->data;
 108         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
 109         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
 110                                                         sizeof(struct fcp_rsp);
 111
 112         /* Initialize local short-hand pointers. */
 113         bpl = psb->fcp_bpl;
 114         pdma_phys = psb->dma_handle;
 115
 116         /*
 117          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
 118          * list bdes.  Initialize the first two and leave the rest for
 119          * queuecommand.
 120          */
 121         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 122         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 123         bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
 124         bpl->tus.f.bdeFlags = BUFF_USE_CMND;
 125         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 126         bpl++;
 127
 128         /* Setup the physical region for the FCP RSP */
 129         pdma_phys += sizeof (struct fcp_cmnd);
 130         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 131         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 132         bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
 133         bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
 134         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 135
 136         /*
 137          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
 138          * initialize it with all known data now.
 139          */
 140         pdma_phys += (sizeof (struct fcp_rsp));
 141         iocb = &psb->cur_iocbq.iocb;
 142         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
 143         iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
 144         iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
 145         iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 146         iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
 147         iocb->ulpBdeCount = 1;
 148         iocb->ulpClass = CLASS3;
 149
 150         return psb;
 151 }
 152
 153 struct  lpfc_scsi_buf*
 154 lpfc_get_scsi_buf(struct lpfc_hba * phba)
 155 {
 156         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
 157         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
 158         unsigned long iflag = 0;
 159
 160         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 161         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
 162         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 163         return  lpfc_cmd;
 164 }
 165
 166 static void
 167 lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 168 {
 169         unsigned long iflag = 0;
 170         /*
 171          * There are only two special cases to consider.  (1) the scsi command
 172          * requested scatter-gather usage or (2) the scsi command allocated
 173          * a request buffer, but did not request use_sg.  There is a third
 174          * case, but it does not require resource deallocation.
 175          */
 176         if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
 177                 dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
 178                                 psb->seg_cnt, psb->pCmd->sc_data_direction);
 179         } else {
 180                  if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
 181                         dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
 182                                                 psb->pCmd->request_bufflen,
 183                                                 psb->pCmd->sc_data_direction);
 184                  }
 185         }
 186
 187         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 188         psb->pCmd = NULL;
 189         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
 190         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 191 }
 192
 193 static int
 194 lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
 195 {
 196         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 197         struct scatterlist *sgel = NULL;
 198         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 199         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
 200         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 201         dma_addr_t physaddr;
 202         uint32_t i, num_bde = 0;
 203         int datadir = scsi_cmnd->sc_data_direction;
 204         int dma_error;
 205
 206         /*
 207          * There are three possibilities here - use scatter-gather segment, use
 208          * the single mapping, or neither.  Start the lpfc command prep by
 209          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 210          * data bde entry.
 211          */
 212         bpl += 2;
 213         if (scsi_cmnd->use_sg) {
 214                 /*
 215                  * The driver stores the segment count returned from pci_map_sg
 216                  * because this a count of dma-mappings used to map the use_sg
 217                  * pages.  They are not guaranteed to be the same for those
 218                  * architectures that implement an IOMMU.
 219                  */
 220                 sgel = (struct scatterlist *)scsi_cmnd->request_buffer;
 221                 lpfc_cmd->seg_cnt = dma_map_sg(&phba->pcidev->dev, sgel,
 222                                                 scsi_cmnd->use_sg, datadir);
 223                 if (lpfc_cmd->seg_cnt == 0)
 224                         return 1;
 225
 226                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
 227                         printk(KERN_ERR "%s: Too many sg segments from "
 228                                "dma_map_sg.  Config %d, seg_cnt %d",
 229                                __FUNCTION__, phba->cfg_sg_seg_cnt,
 230                                lpfc_cmd->seg_cnt);
 231                         dma_unmap_sg(&phba->pcidev->dev, sgel,
 232                                      lpfc_cmd->seg_cnt, datadir);
 233                         return 1;
 234                 }
 235
 236                 /*
 237                  * The driver established a maximum scatter-gather segment count
 238                  * during probe that limits the number of sg elements in any
 239                  * single scsi command.  Just run through the seg_cnt and format
 240                  * the bde's.
 241                  */
 242                 for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
 243                         physaddr = sg_dma_address(sgel);
 244                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 245                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 246                         bpl->tus.f.bdeSize = sg_dma_len(sgel);
 247                         if (datadir == DMA_TO_DEVICE)
 248                                 bpl->tus.f.bdeFlags = 0;
 249                         else
 250                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 251                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 252                         bpl++;
 253                         sgel++;
 254                         num_bde++;
 255                 }
 256         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 257                 physaddr = dma_map_single(&phba->pcidev->dev,
 258                                           scsi_cmnd->request_buffer,
 259                                           scsi_cmnd->request_bufflen,
 260                                           datadir);
 261                 dma_error = dma_mapping_error(physaddr);
 262                 if (dma_error) {
 263                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 264                                 "%d:0718 Unable to dma_map_single "
 265                                 "request_buffer: x%x\n",
 266                                 phba->brd_no, dma_error);
 267                         return 1;
 268                 }
 269
 270                 lpfc_cmd->nonsg_phys = physaddr;
 271                 bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 272                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 273                 bpl->tus.f.bdeSize = scsi_cmnd->request_bufflen;
 274                 if (datadir == DMA_TO_DEVICE)
 275                         bpl->tus.f.bdeFlags = 0;
 276                 else
 277                         bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 278                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
 279                 num_bde = 1;
 280                 bpl++;
 281         }
 282
 283         /*
 284          * Finish initializing those IOCB fields that are dependent on the
 285          * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
 286          * reinitialized since all iocb memory resources are used many times
 287          * for transmit, receive, and continuation bpl's.
 288          */
 289         iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 290         iocb_cmd->un.fcpi64.bdl.bdeSize +=
 291                 (num_bde * sizeof (struct ulp_bde64));
 292         iocb_cmd->ulpBdeCount = 1;
 293         iocb_cmd->ulpLe = 1;
 294         fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
 295         return 0;
 296 }
 297
 298 static void
 299 lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
 300 {
 301         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 302         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
 303         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 304         struct lpfc_hba *phba = lpfc_cmd->scsi_hba;
 305         uint32_t fcpi_parm = lpfc_cmd->cur_iocbq.iocb.un.fcpi.fcpi_parm;
 306         uint32_t resp_info = fcprsp->rspStatus2;
 307         uint32_t scsi_status = fcprsp->rspStatus3;
 308         uint32_t host_status = DID_OK;
 309         uint32_t rsplen = 0;
 310
 311         /*
 312          *  If this is a task management command, there is no
 313          *  scsi packet associated with this lpfc_cmd.  The driver
 314          *  consumes it.
 315          */
 316         if (fcpcmd->fcpCntl2) {
 317                 scsi_status = 0;
 318                 goto out;
 319         }
 320
 321         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 322                         "%d:0730 FCP command failed: RSP "
 323                         "Data: x%x x%x x%x x%x x%x x%x\n",
 324                         phba->brd_no, resp_info, scsi_status,
 325                         be32_to_cpu(fcprsp->rspResId),
 326                         be32_to_cpu(fcprsp->rspSnsLen),
 327                         be32_to_cpu(fcprsp->rspRspLen),
 328                         fcprsp->rspInfo3);
 329
 330         if (resp_info & RSP_LEN_VALID) {
 331                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
 332                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
 333                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
 334                         host_status = DID_ERROR;
 335                         goto out;
 336                 }
 337         }
 338
 339         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
 340                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
 341                 if (snslen > SCSI_SENSE_BUFFERSIZE)
 342                         snslen = SCSI_SENSE_BUFFERSIZE;
 343
 344                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
 345         }
 346
 347         cmnd->resid = 0;
 348         if (resp_info & RESID_UNDER) {
 349                 cmnd->resid = be32_to_cpu(fcprsp->rspResId);
 350
 351                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 352                                 "%d:0716 FCP Read Underrun, expected %d, "
 353                                 "residual %d Data: x%x x%x x%x\n", phba->brd_no,
 354                                 be32_to_cpu(fcpcmd->fcpDl), cmnd->resid,
 355                                 fcpi_parm, cmnd->cmnd[0], cmnd->underflow);
 356
 357                 /*
 358                  * The cmnd->underflow is the minimum number of bytes that must
 359                  * be transfered for this command.  Provided a sense condition
 360                  * is not present, make sure the actual amount transferred is at
 361                  * least the underflow value or fail.
 362                  */
 363                 if (!(resp_info & SNS_LEN_VALID) &&
 364                     (scsi_status == SAM_STAT_GOOD) &&
 365                     (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
 366                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 367                                         "%d:0717 FCP command x%x residual "
 368                                         "underrun converted to error "
 369                                         "Data: x%x x%x x%x\n", phba->brd_no,
 370                                         cmnd->cmnd[0], cmnd->request_bufflen,
 371                                         cmnd->resid, cmnd->underflow);
 372
 373                         host_status = DID_ERROR;
 374                 }
 375         } else if (resp_info & RESID_OVER) {
 376                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 377                                 "%d:0720 FCP command x%x residual "
 378                                 "overrun error. Data: x%x x%x \n",
 379                                 phba->brd_no, cmnd->cmnd[0],
 380                                 cmnd->request_bufflen, cmnd->resid);
 381                 host_status = DID_ERROR;
 382
 383         /*
 384          * Check SLI validation that all the transfer was actually done
 385          * (fcpi_parm should be zero). Apply check only to reads.
 386          */
 387         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
 388                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
 389                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 390                         "%d:0734 FCP Read Check Error Data: "
 391                         "x%x x%x x%x x%x\n", phba->brd_no,
 392                         be32_to_cpu(fcpcmd->fcpDl),
 393                         be32_to_cpu(fcprsp->rspResId),
 394                         fcpi_parm, cmnd->cmnd[0]);
 395                 host_status = DID_ERROR;
 396                 cmnd->resid = cmnd->request_bufflen;
 397         }
 398
 399  out:
 400         cmnd->result = ScsiResult(host_status, scsi_status);
 401 }
 402
 403 static void
 404 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 405                         struct lpfc_iocbq *pIocbOut)
 406 {
 407         struct lpfc_scsi_buf *lpfc_cmd =
 408                 (struct lpfc_scsi_buf *) pIocbIn->context1;
 409         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 410         struct lpfc_nodelist *pnode = rdata->pnode;
 411         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
 412
 413         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 414         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 415
 416         if (lpfc_cmd->status) {
 417                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 418                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 419                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 420                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 421                         lpfc_cmd->status = IOSTAT_DEFAULT;
 422
 423                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 424                                 "%d:0729 FCP cmd x%x failed <%d/%d> status: "
 425                                 "x%x result: x%x Data: x%x x%x\n",
 426                                 phba->brd_no, cmd->cmnd[0], cmd->device->id,
 427                                 cmd->device->lun, lpfc_cmd->status,
 428                                 lpfc_cmd->result, pIocbOut->iocb.ulpContext,
 429                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 430
 431                 switch (lpfc_cmd->status) {
 432                 case IOSTAT_FCP_RSP_ERROR:
 433                         /* Call FCP RSP handler to determine result */
 434                         lpfc_handle_fcp_err(lpfc_cmd);
 435                         break;
 436                 case IOSTAT_NPORT_BSY:
 437                 case IOSTAT_FABRIC_BSY:
 438                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
 439                         break;
 440                 default:
 441                         cmd->result = ScsiResult(DID_ERROR, 0);
 442                         break;
 443                 }
 444
 445                 if ((pnode == NULL )
 446                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
 447                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
 448         } else {
 449                 cmd->result = ScsiResult(DID_OK, 0);
 450         }
 451
 452         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
 453                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
 454
 455                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 456                                 "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
 457                                 "SNS x%x x%x Data: x%x x%x\n",
 458                                 phba->brd_no, cmd->device->id,
 459                                 cmd->device->lun, cmd, cmd->result,
 460                                 *lp, *(lp + 3), cmd->retries, cmd->resid);
 461         }
 462
 463         cmd->scsi_done(cmd);
 464
 465         lpfc_release_scsi_buf(phba, lpfc_cmd);
 466 }
 467
 468 static void
 469 lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
 470                         struct lpfc_nodelist *pnode)
 471 {
 472         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 473         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 474         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 475         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
 476         int datadir = scsi_cmnd->sc_data_direction;
 477
 478         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
 479         /* clear task management bits */
 480         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
 481
 482         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 483                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 484
 485         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
 486
 487         if (scsi_cmnd->device->tagged_supported) {
 488                 switch (scsi_cmnd->tag) {
 489                 case HEAD_OF_QUEUE_TAG:
 490                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
 491                         break;
 492                 case ORDERED_QUEUE_TAG:
 493                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
 494                         break;
 495                 default:
 496                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
 497                         break;
 498                 }
 499         } else
 500                 fcp_cmnd->fcpCntl1 = 0;
 501
 502         /*
 503          * There are three possibilities here - use scatter-gather segment, use
 504          * the single mapping, or neither.  Start the lpfc command prep by
 505          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 506          * data bde entry.
 507          */
 508         if (scsi_cmnd->use_sg) {
 509                 if (datadir == DMA_TO_DEVICE) {
 510                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 511                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 512                         iocb_cmd->ulpPU = 0;
 513                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 514                         phba->fc4OutputRequests++;
 515                 } else {
 516                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 517                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 518                         iocb_cmd->un.fcpi.fcpi_parm =
 519                                 scsi_cmnd->request_bufflen;
 520                         fcp_cmnd->fcpCntl3 = READ_DATA;
 521                         phba->fc4InputRequests++;
 522                 }
 523         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 524                 if (datadir == DMA_TO_DEVICE) {
 525                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 526                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 527                         iocb_cmd->ulpPU = 0;
 528                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 529                         phba->fc4OutputRequests++;
 530                 } else {
 531                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 532                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 533                         iocb_cmd->un.fcpi.fcpi_parm =
 534                                 scsi_cmnd->request_bufflen;
 535                         fcp_cmnd->fcpCntl3 = READ_DATA;
 536                         phba->fc4InputRequests++;
 537                 }
 538         } else {
 539                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
 540                 iocb_cmd->un.fcpi.fcpi_parm = 0;
 541                 iocb_cmd->ulpPU = 0;
 542                 fcp_cmnd->fcpCntl3 = 0;
 543                 phba->fc4ControlRequests++;
 544         }
 545
 546         /*
 547          * Finish initializing those IOCB fields that are independent
 548          * of the scsi_cmnd request_buffer
 549          */
 550         piocbq->iocb.ulpContext = pnode->nlp_rpi;
 551         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
 552                 piocbq->iocb.ulpFCP2Rcvy = 1;
 553
 554         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
 555         piocbq->context1  = lpfc_cmd;
 556         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
 557         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
 558 }
 559
 560 static int
 561 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
 562                              struct lpfc_scsi_buf *lpfc_cmd,
 563                              uint8_t task_mgmt_cmd)
 564 {
 565         struct lpfc_sli *psli;
 566         struct lpfc_iocbq *piocbq;
 567         IOCB_t *piocb;
 568         struct fcp_cmnd *fcp_cmnd;
 569         struct scsi_device *scsi_dev = lpfc_cmd->pCmd->device;
 570         struct lpfc_rport_data *rdata = scsi_dev->hostdata;
 571         struct lpfc_nodelist *ndlp = rdata->pnode;
 572
 573         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
 574                 return 0;
 575         }
 576
 577         psli = &phba->sli;
 578         piocbq = &(lpfc_cmd->cur_iocbq);
 579         piocb = &piocbq->iocb;
 580
 581         fcp_cmnd = lpfc_cmd->fcp_cmnd;
 582         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 583                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 584         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
 585
 586         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
 587
 588         piocb->ulpContext = ndlp->nlp_rpi;
 589         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
 590                 piocb->ulpFCP2Rcvy = 1;
 591         }
 592         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
 593
 594         /* ulpTimeout is only one byte */
 595         if (lpfc_cmd->timeout > 0xff) {
 596                 /*
 597                  * Do not timeout the command at the firmware level.
 598                  * The driver will provide the timeout mechanism.
 599                  */
 600                 piocb->ulpTimeout = 0;
 601         } else {
 602                 piocb->ulpTimeout = lpfc_cmd->timeout;
 603         }
 604
 605         lpfc_cmd->rdata = rdata;
 606
 607         switch (task_mgmt_cmd) {
 608         case FCP_LUN_RESET:
 609                 /* Issue LUN Reset to TGT <num> LUN <num> */
 610                 lpfc_printf_log(phba,
 611                                 KERN_INFO,
 612                                 LOG_FCP,
 613                                 "%d:0703 Issue LUN Reset to TGT %d LUN %d "
 614                                 "Data: x%x x%x\n",
 615                                 phba->brd_no,
 616                                 scsi_dev->id, scsi_dev->lun,
 617                                 ndlp->nlp_rpi, ndlp->nlp_flag);
 618
 619                 break;
 620         case FCP_ABORT_TASK_SET:
 621                 /* Issue Abort Task Set to TGT <num> LUN <num> */
 622                 lpfc_printf_log(phba,
 623                                 KERN_INFO,
 624                                 LOG_FCP,
 625                                 "%d:0701 Issue Abort Task Set to TGT %d LUN %d "
 626                                 "Data: x%x x%x\n",
 627                                 phba->brd_no,
 628                                 scsi_dev->id, scsi_dev->lun,
 629                                 ndlp->nlp_rpi, ndlp->nlp_flag);
 630
 631                 break;
 632         case FCP_TARGET_RESET:
 633                 /* Issue Target Reset to TGT <num> */
 634                 lpfc_printf_log(phba,
 635                                 KERN_INFO,
 636                                 LOG_FCP,
 637                                 "%d:0702 Issue Target Reset to TGT %d "
 638                                 "Data: x%x x%x\n",
 639                                 phba->brd_no,
 640                                 scsi_dev->id, ndlp->nlp_rpi,
 641                                 ndlp->nlp_flag);
 642                 break;
 643         }
 644
 645         return (1);
 646 }
 647
 648 static int
 649 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba)
 650 {
 651         struct lpfc_iocbq *iocbq;
 652         struct lpfc_iocbq *iocbqrsp;
 653         int ret;
 654
 655         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_TARGET_RESET);
 656         if (!ret)
 657                 return FAILED;
 658
 659         lpfc_cmd->scsi_hba = phba;
 660         iocbq = &lpfc_cmd->cur_iocbq;
 661         iocbqrsp = lpfc_sli_get_iocbq(phba);
 662
 663         if (!iocbqrsp)
 664                 return FAILED;
 665
 666         ret = lpfc_sli_issue_iocb_wait(phba,
 667                                        &phba->sli.ring[phba->sli.fcp_ring],
 668                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 669         if (ret != IOCB_SUCCESS) {
 670                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 671                 ret = FAILED;
 672         } else {
 673                 ret = SUCCESS;
 674                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 675                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 676                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 677                         (lpfc_cmd->result & IOERR_DRVR_MASK))
 678                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 679         }
 680
 681         lpfc_sli_release_iocbq(phba, iocbqrsp);
 682         return ret;
 683 }
 684
 685 const char *
 686 lpfc_info(struct Scsi_Host *host)
 687 {
 688         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata[0];
 689         int len;
 690         static char  lpfcinfobuf[384];
 691
 692         memset(lpfcinfobuf,0,384);
 693         if (phba && phba->pcidev){
 694                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
 695                 len = strlen(lpfcinfobuf);
 696                 snprintf(lpfcinfobuf + len,
 697                         384-len,
 698                         " on PCI bus %02x device %02x irq %d",
 699                         phba->pcidev->bus->number,
 700                         phba->pcidev->devfn,
 701                         phba->pcidev->irq);
 702                 len = strlen(lpfcinfobuf);
 703                 if (phba->Port[0]) {
 704                         snprintf(lpfcinfobuf + len,
 705                                  384-len,
 706                                  " port %s",
 707                                  phba->Port);
 708                 }
 709         }
 710         return lpfcinfobuf;
 711 }
 712
 713 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
 714 {
 715         unsigned long  poll_tmo_expires =
 716                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
 717
 718         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
 719                 mod_timer(&phba->fcp_poll_timer,
 720                           poll_tmo_expires);
 721 }
 722
 723 void lpfc_poll_start_timer(struct lpfc_hba * phba)
 724 {
 725         lpfc_poll_rearm_timer(phba);
 726 }
 727
 728 void lpfc_poll_timeout(unsigned long ptr)
 729 {
 730         struct lpfc_hba *phba = (struct lpfc_hba *)ptr;
 731         unsigned long iflag;
 732
 733         spin_lock_irqsave(phba->host->host_lock, iflag);
 734
 735         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 736                 lpfc_sli_poll_fcp_ring (phba);
 737                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 738                         lpfc_poll_rearm_timer(phba);
 739         }
 740
 741         spin_unlock_irqrestore(phba->host->host_lock, iflag);
 742 }
 743
 744 static int
 745 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 746 {
 747         struct lpfc_hba *phba =
 748                 (struct lpfc_hba *) cmnd->device->host->hostdata[0];
 749         struct lpfc_sli *psli = &phba->sli;
 750         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 751         struct lpfc_nodelist *ndlp = rdata->pnode;
 752         struct lpfc_scsi_buf *lpfc_cmd;
 753         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 754         int err;
 755
 756         err = fc_remote_port_chkready(rport);
 757         if (err) {
 758                 cmnd->result = err;
 759                 goto out_fail_command;
 760         }
 761
 762         /*
 763          * Catch race where our node has transitioned, but the
 764          * transport is still transitioning.
 765          */
 766         if (!ndlp) {
 767                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
 768                 goto out_fail_command;
 769         }
 770         lpfc_cmd = lpfc_get_scsi_buf (phba);
 771         if (lpfc_cmd == NULL) {
 772                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 773                                 "%d:0707 driver's buffer pool is empty, "
 774                                 "IO busied\n", phba->brd_no);
 775                 goto out_host_busy;
 776         }
 777
 778         /*
 779          * Store the midlayer's command structure for the completion phase
 780          * and complete the command initialization.
 781          */
 782         lpfc_cmd->pCmd  = cmnd;
 783         lpfc_cmd->rdata = rdata;
 784         lpfc_cmd->timeout = 0;
 785         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
 786         cmnd->scsi_done = done;
 787
 788         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
 789         if (err)
 790                 goto out_host_busy_free_buf;
 791
 792         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
 793
 794         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
 795                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
 796         if (err)
 797                 goto out_host_busy_free_buf;
 798
 799         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 800                 lpfc_sli_poll_fcp_ring(phba);
 801                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 802                         lpfc_poll_rearm_timer(phba);
 803         }
 804
 805         return 0;
 806
 807  out_host_busy_free_buf:
 808         lpfc_release_scsi_buf(phba, lpfc_cmd);
 809  out_host_busy:
 810         return SCSI_MLQUEUE_HOST_BUSY;
 811
 812  out_fail_command:
 813         done(cmnd);
 814         return 0;
 815 }
 816
 817
 818 static int
 819 lpfc_abort_handler(struct scsi_cmnd *cmnd)
 820 {
 821         struct Scsi_Host *shost = cmnd->device->host;
 822         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
 823         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
 824         struct lpfc_iocbq *iocb;
 825         struct lpfc_iocbq *abtsiocb;
 826         struct lpfc_scsi_buf *lpfc_cmd;
 827         IOCB_t *cmd, *icmd;
 828         unsigned int loop_count = 0;
 829         int ret = SUCCESS;
 830
 831         lpfc_block_requests(phba);
 832         spin_lock_irq(shost->host_lock);
 833
 834         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
 835         BUG_ON(!lpfc_cmd);
 836
 837         /*
 838          * If pCmd field of the corresponding lpfc_scsi_buf structure
 839          * points to a different SCSI command, then the driver has
 840          * already completed this command, but the midlayer did not
 841          * see the completion before the eh fired.  Just return
 842          * SUCCESS.
 843          */
 844         iocb = &lpfc_cmd->cur_iocbq;
 845         if (lpfc_cmd->pCmd != cmnd)
 846                 goto out;
 847
 848         BUG_ON(iocb->context1 != lpfc_cmd);
 849
 850         abtsiocb = lpfc_sli_get_iocbq(phba);
 851         if (abtsiocb == NULL) {
 852                 ret = FAILED;
 853                 goto out;
 854         }
 855
 856         /*
 857          * The scsi command can not be in txq and it is in flight because the
 858          * pCmd is still pointig at the SCSI command we have to abort. There
 859          * is no need to search the txcmplq. Just send an abort to the FW.
 860          */
 861
 862         cmd = &iocb->iocb;
 863         icmd = &abtsiocb->iocb;
 864         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
 865         icmd->un.acxri.abortContextTag = cmd->ulpContext;
 866         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
 867
 868         icmd->ulpLe = 1;
 869         icmd->ulpClass = cmd->ulpClass;
 870         if (phba->hba_state >= LPFC_LINK_UP)
 871                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
 872         else
 873                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
 874
 875         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
 876         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
 877                 lpfc_sli_release_iocbq(phba, abtsiocb);
 878                 ret = FAILED;
 879                 goto out;
 880         }
 881
 882         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 883                 lpfc_sli_poll_fcp_ring (phba);
 884
 885         /* Wait for abort to complete */
 886         while (lpfc_cmd->pCmd == cmnd)
 887         {
 888                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 889                         lpfc_sli_poll_fcp_ring (phba);
 890
 891                 spin_unlock_irq(phba->host->host_lock);
 892                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
 893                 spin_lock_irq(phba->host->host_lock);
 894                 if (++loop_count
 895                     > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
 896                         break;
 897         }
 898
 899         if (lpfc_cmd->pCmd == cmnd) {
 900                 ret = FAILED;
 901                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 902                                 "%d:0748 abort handler timed out waiting for "
 903                                 "abort to complete: ret %#x, ID %d, LUN %d, "
 904                                 "snum %#lx\n",
 905                                 phba->brd_no,  ret, cmnd->device->id,
 906                                 cmnd->device->lun, cmnd->serial_number);
 907         }
 908
 909  out:
 910         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 911                         "%d:0749 SCSI Layer I/O Abort Request "
 912                         "Status x%x ID %d LUN %d snum %#lx\n",
 913                         phba->brd_no, ret, cmnd->device->id,
 914                         cmnd->device->lun, cmnd->serial_number);
 915
 916         spin_unlock_irq(shost->host_lock);
 917         lpfc_unblock_requests(phba);
 918
 919         return ret;
 920 }
 921
 922 static int
 923 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 924 {
 925         struct Scsi_Host *shost = cmnd->device->host;
 926         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
 927         struct lpfc_scsi_buf *lpfc_cmd;
 928         struct lpfc_iocbq *iocbq, *iocbqrsp;
 929         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 930         struct lpfc_nodelist *pnode = rdata->pnode;
 931         uint32_t cmd_result = 0, cmd_status = 0;
 932         int ret = FAILED;
 933         int cnt, loopcnt;
 934
 935         lpfc_block_requests(phba);
 936         spin_lock_irq(shost->host_lock);
 937         /*
 938          * If target is not in a MAPPED state, delay the reset until
 939          * target is rediscovered or nodev timeout expires.
 940          */
 941         while ( 1 ) {
 942                 if (!pnode)
 943                         break;
 944
 945                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
 946                         spin_unlock_irq(phba->host->host_lock);
 947                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
 948                         spin_lock_irq(phba->host->host_lock);
 949                 }
 950                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
 951                         break;
 952         }
 953
 954         lpfc_cmd = lpfc_get_scsi_buf (phba);
 955         if (lpfc_cmd == NULL)
 956                 goto out;
 957
 958         lpfc_cmd->pCmd = cmnd;
 959         lpfc_cmd->timeout = 60;
 960         lpfc_cmd->scsi_hba = phba;
 961
 962         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_LUN_RESET);
 963         if (!ret)
 964                 goto out_free_scsi_buf;
 965
 966         iocbq = &lpfc_cmd->cur_iocbq;
 967
 968         /* get a buffer for this IOCB command response */
 969         iocbqrsp = lpfc_sli_get_iocbq(phba);
 970         if (iocbqrsp == NULL)
 971                 goto out_free_scsi_buf;
 972
 973         ret = lpfc_sli_issue_iocb_wait(phba,
 974                                        &phba->sli.ring[phba->sli.fcp_ring],
 975                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 976         if (ret == IOCB_SUCCESS)
 977                 ret = SUCCESS;
 978
 979
 980         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
 981         cmd_status = iocbqrsp->iocb.ulpStatus;
 982
 983         lpfc_sli_release_iocbq(phba, iocbqrsp);
 984         lpfc_release_scsi_buf(phba, lpfc_cmd);
 985
 986         /*
 987          * All outstanding txcmplq I/Os should have been aborted by the device.
 988          * Unfortunately, some targets do not abide by this forcing the driver
 989          * to double check.
 990          */
 991         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
 992                                 cmnd->device->id, cmnd->device->lun,
 993                                 LPFC_CTX_LUN);
 994         if (cnt)
 995                 lpfc_sli_abort_iocb(phba,
 996                                     &phba->sli.ring[phba->sli.fcp_ring],
 997                                     cmnd->device->id, cmnd->device->lun,
 998                                     0, LPFC_CTX_LUN);
 999         loopcnt = 0;
1000         while(cnt) {
1001                 spin_unlock_irq(phba->host->host_lock);
1002                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1003                 spin_lock_irq(phba->host->host_lock);
1004
1005                 if (++loopcnt
1006                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1007                         break;
1008
1009                 cnt = lpfc_sli_sum_iocb(phba,
1010                                         &phba->sli.ring[phba->sli.fcp_ring],
1011                                         cmnd->device->id, cmnd->device->lun,
1012                                         LPFC_CTX_LUN);
1013         }
1014
1015         if (cnt) {
1016                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1017                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
1018                         phba->brd_no, cnt);
1019                 ret = FAILED;
1020         }
1021
1022 out_free_scsi_buf:
1023         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1024                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
1025                         "Data: x%x x%x x%x\n",
1026                         phba->brd_no, cmnd->device->id,cmnd->device->lun,
1027                         ret, cmd_status, cmd_result);
1028
1029 out:
1030         spin_unlock_irq(shost->host_lock);
1031         lpfc_unblock_requests(phba);
1032         return ret;
1033 }
1034
1035 static int
1036 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1037 {
1038         struct Scsi_Host *shost = cmnd->device->host;
1039         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
1040         struct lpfc_nodelist *ndlp = NULL;
1041         int match;
1042         int ret = FAILED, i, err_count = 0;
1043         int cnt, loopcnt;
1044         unsigned int midlayer_id = 0;
1045         struct lpfc_scsi_buf * lpfc_cmd;
1046
1047         lpfc_block_requests(phba);
1048         spin_lock_irq(shost->host_lock);
1049
1050         lpfc_cmd = lpfc_get_scsi_buf(phba);
1051         if (lpfc_cmd == NULL)
1052                 goto out;
1053
1054         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1055         lpfc_cmd->timeout = 60;
1056         lpfc_cmd->pCmd = cmnd;
1057         lpfc_cmd->scsi_hba = phba;
1058
1059         /*
1060          * Since the driver manages a single bus device, reset all
1061          * targets known to the driver.  Should any target reset
1062          * fail, this routine returns failure to the midlayer.
1063          */
1064         midlayer_id = cmnd->device->id;
1065         for (i = 0; i < MAX_FCP_TARGET; i++) {
1066                 /* Search the mapped list for this target ID */
1067                 match = 0;
1068                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1069                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1070                                 match = 1;
1071                                 break;
1072                         }
1073                 }
1074                 if (!match)
1075                         continue;
1076
1077                 lpfc_cmd->pCmd->device->id = i;
1078                 lpfc_cmd->pCmd->device->hostdata = ndlp->rport->dd_data;
1079                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba);
1080                 if (ret != SUCCESS) {
1081                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1082                                 "%d:0713 Bus Reset on target %d failed\n",
1083                                 phba->brd_no, i);
1084                         err_count++;
1085                 }
1086         }
1087
1088         if (err_count == 0)
1089                 ret = SUCCESS;
1090
1091         lpfc_release_scsi_buf(phba, lpfc_cmd);
1092
1093         /*
1094          * All outstanding txcmplq I/Os should have been aborted by
1095          * the targets.  Unfortunately, some targets do not abide by
1096          * this forcing the driver to double check.
1097          */
1098         cmnd->device->id = midlayer_id;
1099         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1100                                 0, 0, LPFC_CTX_HOST);
1101         if (cnt)
1102                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1103                                     0, 0, 0, LPFC_CTX_HOST);
1104         loopcnt = 0;
1105         while(cnt) {
1106                 spin_unlock_irq(phba->host->host_lock);
1107                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1108                 spin_lock_irq(phba->host->host_lock);
1109
1110                 if (++loopcnt
1111                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1112                         break;
1113
1114                 cnt = lpfc_sli_sum_iocb(phba,
1115                                         &phba->sli.ring[phba->sli.fcp_ring],
1116                                         0, 0, LPFC_CTX_HOST);
1117         }
1118
1119         if (cnt) {
1120                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1121                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1122                    phba->brd_no, cnt, i);
1123                 ret = FAILED;
1124         }
1125
1126         lpfc_printf_log(phba,
1127                         KERN_ERR,
1128                         LOG_FCP,
1129                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1130                         phba->brd_no, ret);
1131 out:
1132         spin_unlock_irq(shost->host_lock);
1133         lpfc_unblock_requests(phba);
1134         return ret;
1135 }
1136
1137 static int
1138 lpfc_slave_alloc(struct scsi_device *sdev)
1139 {
1140         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata[0];
1141         struct lpfc_scsi_buf *scsi_buf = NULL;
1142         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1143         uint32_t total = 0, i;
1144         uint32_t num_to_alloc = 0;
1145         unsigned long flags;
1146
1147         if (!rport || fc_remote_port_chkready(rport))
1148                 return -ENXIO;
1149
1150         sdev->hostdata = rport->dd_data;
1151
1152         /*
1153          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1154          * available list of scsi buffers.  Don't allocate more than the
1155          * HBA limit conveyed to the midlayer via the host structure.  The
1156          * formula accounts for the lun_queue_depth + error handlers + 1
1157          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1158          */
1159         total = phba->total_scsi_bufs;
1160         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1161         if (total >= phba->cfg_hba_queue_depth) {
1162                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1163                                 "%d:0704 At limitation of %d preallocated "
1164                                 "command buffers\n", phba->brd_no, total);
1165                 return 0;
1166         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1167                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1168                                 "%d:0705 Allocation request of %d command "
1169                                 "buffers will exceed max of %d.  Reducing "
1170                                 "allocation request to %d.\n", phba->brd_no,
1171                                 num_to_alloc, phba->cfg_hba_queue_depth,
1172                                 (phba->cfg_hba_queue_depth - total));
1173                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1174         }
1175
1176         for (i = 0; i < num_to_alloc; i++) {
1177                 scsi_buf = lpfc_new_scsi_buf(phba);
1178                 if (!scsi_buf) {
1179                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1180                                         "%d:0706 Failed to allocate command "
1181                                         "buffer\n", phba->brd_no);
1182                         break;
1183                 }
1184
1185                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1186                 phba->total_scsi_bufs++;
1187                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1188                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1189         }
1190         return 0;
1191 }
1192
1193 static int
1194 lpfc_slave_configure(struct scsi_device *sdev)
1195 {
1196         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata[0];
1197         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1198
1199         if (sdev->tagged_supported)
1200                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1201         else
1202                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1203
1204         /*
1205          * Initialize the fc transport attributes for the target
1206          * containing this scsi device.  Also note that the driver's
1207          * target pointer is stored in the starget_data for the
1208          * driver's sysfs entry point functions.
1209          */
1210         rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;
1211
1212         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1213                 lpfc_sli_poll_fcp_ring(phba);
1214                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1215                         lpfc_poll_rearm_timer(phba);
1216         }
1217
1218         return 0;
1219 }
1220
1221 static void
1222 lpfc_slave_destroy(struct scsi_device *sdev)
1223 {
1224         sdev->hostdata = NULL;
1225         return;
1226 }
1227
1228 struct scsi_host_template lpfc_template = {
1229         .module                 = THIS_MODULE,
1230         .name                   = LPFC_DRIVER_NAME,
1231         .info                   = lpfc_info,
1232         .queuecommand           = lpfc_queuecommand,
1233         .eh_abort_handler       = lpfc_abort_handler,
1234         .eh_device_reset_handler= lpfc_reset_lun_handler,
1235         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1236         .slave_alloc            = lpfc_slave_alloc,
1237         .slave_configure        = lpfc_slave_configure,
1238         .slave_destroy          = lpfc_slave_destroy,
1239         .this_id                = -1,
1240         .sg_tablesize           = LPFC_SG_SEG_CNT,
1241         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1242         .use_clustering         = ENABLE_CLUSTERING,
1243         .shost_attrs            = lpfc_host_attrs,
1244         .max_sectors            = 0xFFFF,
1245 };