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 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 static 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         int result;
 413         struct scsi_device *sdev, *tmp_sdev;
 414         int depth = 0;
 415
 416         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 417         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 418
 419         if (lpfc_cmd->status) {
 420                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 421                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 422                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 423                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 424                         lpfc_cmd->status = IOSTAT_DEFAULT;
 425
 426                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 427                                 "%d:0729 FCP cmd x%x failed <%d/%d> status: "
 428                                 "x%x result: x%x Data: x%x x%x\n",
 429                                 phba->brd_no, cmd->cmnd[0], cmd->device->id,
 430                                 cmd->device->lun, lpfc_cmd->status,
 431                                 lpfc_cmd->result, pIocbOut->iocb.ulpContext,
 432                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 433
 434                 switch (lpfc_cmd->status) {
 435                 case IOSTAT_FCP_RSP_ERROR:
 436                         /* Call FCP RSP handler to determine result */
 437                         lpfc_handle_fcp_err(lpfc_cmd);
 438                         break;
 439                 case IOSTAT_NPORT_BSY:
 440                 case IOSTAT_FABRIC_BSY:
 441                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
 442                         break;
 443                 default:
 444                         cmd->result = ScsiResult(DID_ERROR, 0);
 445                         break;
 446                 }
 447
 448                 if ((pnode == NULL )
 449                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
 450                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
 451         } else {
 452                 cmd->result = ScsiResult(DID_OK, 0);
 453         }
 454
 455         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
 456                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
 457
 458                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 459                                 "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
 460                                 "SNS x%x x%x Data: x%x x%x\n",
 461                                 phba->brd_no, cmd->device->id,
 462                                 cmd->device->lun, cmd, cmd->result,
 463                                 *lp, *(lp + 3), cmd->retries, cmd->resid);
 464         }
 465
 466         result = cmd->result;
 467         sdev = cmd->device;
 468         cmd->scsi_done(cmd);
 469
 470         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 471                 lpfc_release_scsi_buf(phba, lpfc_cmd);
 472                 return;
 473         }
 474
 475         if (!result && pnode != NULL &&
 476            ((jiffies - pnode->last_ramp_up_time) >
 477                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 478            ((jiffies - pnode->last_q_full_time) >
 479                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 480            (phba->cfg_lun_queue_depth > sdev->queue_depth)) {
 481                 shost_for_each_device(tmp_sdev, sdev->host) {
 482                         if (phba->cfg_lun_queue_depth > tmp_sdev->queue_depth) {
 483                                 if (tmp_sdev->id != sdev->id)
 484                                         continue;
 485                                 if (tmp_sdev->ordered_tags)
 486                                         scsi_adjust_queue_depth(tmp_sdev,
 487                                                 MSG_ORDERED_TAG,
 488                                                 tmp_sdev->queue_depth+1);
 489                                 else
 490                                         scsi_adjust_queue_depth(tmp_sdev,
 491                                                 MSG_SIMPLE_TAG,
 492                                                 tmp_sdev->queue_depth+1);
 493
 494                                 pnode->last_ramp_up_time = jiffies;
 495                         }
 496                 }
 497         }
 498
 499         /*
 500          * Check for queue full.  If the lun is reporting queue full, then
 501          * back off the lun queue depth to prevent target overloads.
 502          */
 503         if (result == SAM_STAT_TASK_SET_FULL && pnode != NULL) {
 504                 pnode->last_q_full_time = jiffies;
 505
 506                 shost_for_each_device(tmp_sdev, sdev->host) {
 507                         if (tmp_sdev->id != sdev->id)
 508                                 continue;
 509                         depth = scsi_track_queue_full(tmp_sdev,
 510                                         tmp_sdev->queue_depth - 1);
 511                 }
 512                 /*
 513                  * The queue depth cannot be lowered any more.
 514                  * Modify the returned error code to store
 515                  * the final depth value set by
 516                  * scsi_track_queue_full.
 517                  */
 518                 if (depth == -1)
 519                         depth = sdev->host->cmd_per_lun;
 520
 521                 if (depth) {
 522                         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 523                                 "%d:0711 detected queue full - lun queue depth "
 524                                 " adjusted to %d.\n", phba->brd_no, depth);
 525                 }
 526         }
 527
 528         lpfc_release_scsi_buf(phba, lpfc_cmd);
 529 }
 530
 531 static void
 532 lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
 533                         struct lpfc_nodelist *pnode)
 534 {
 535         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 536         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 537         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 538         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
 539         int datadir = scsi_cmnd->sc_data_direction;
 540
 541         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
 542         /* clear task management bits */
 543         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
 544
 545         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 546                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 547
 548         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
 549
 550         if (scsi_cmnd->device->tagged_supported) {
 551                 switch (scsi_cmnd->tag) {
 552                 case HEAD_OF_QUEUE_TAG:
 553                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
 554                         break;
 555                 case ORDERED_QUEUE_TAG:
 556                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
 557                         break;
 558                 default:
 559                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
 560                         break;
 561                 }
 562         } else
 563                 fcp_cmnd->fcpCntl1 = 0;
 564
 565         /*
 566          * There are three possibilities here - use scatter-gather segment, use
 567          * the single mapping, or neither.  Start the lpfc command prep by
 568          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 569          * data bde entry.
 570          */
 571         if (scsi_cmnd->use_sg) {
 572                 if (datadir == DMA_TO_DEVICE) {
 573                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 574                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 575                         iocb_cmd->ulpPU = 0;
 576                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 577                         phba->fc4OutputRequests++;
 578                 } else {
 579                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 580                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 581                         iocb_cmd->un.fcpi.fcpi_parm =
 582                                 scsi_cmnd->request_bufflen;
 583                         fcp_cmnd->fcpCntl3 = READ_DATA;
 584                         phba->fc4InputRequests++;
 585                 }
 586         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 587                 if (datadir == DMA_TO_DEVICE) {
 588                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 589                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 590                         iocb_cmd->ulpPU = 0;
 591                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 592                         phba->fc4OutputRequests++;
 593                 } else {
 594                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 595                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 596                         iocb_cmd->un.fcpi.fcpi_parm =
 597                                 scsi_cmnd->request_bufflen;
 598                         fcp_cmnd->fcpCntl3 = READ_DATA;
 599                         phba->fc4InputRequests++;
 600                 }
 601         } else {
 602                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
 603                 iocb_cmd->un.fcpi.fcpi_parm = 0;
 604                 iocb_cmd->ulpPU = 0;
 605                 fcp_cmnd->fcpCntl3 = 0;
 606                 phba->fc4ControlRequests++;
 607         }
 608
 609         /*
 610          * Finish initializing those IOCB fields that are independent
 611          * of the scsi_cmnd request_buffer
 612          */
 613         piocbq->iocb.ulpContext = pnode->nlp_rpi;
 614         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
 615                 piocbq->iocb.ulpFCP2Rcvy = 1;
 616
 617         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
 618         piocbq->context1  = lpfc_cmd;
 619         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
 620         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
 621 }
 622
 623 static int
 624 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
 625                              struct lpfc_scsi_buf *lpfc_cmd,
 626                              uint8_t task_mgmt_cmd)
 627 {
 628         struct lpfc_sli *psli;
 629         struct lpfc_iocbq *piocbq;
 630         IOCB_t *piocb;
 631         struct fcp_cmnd *fcp_cmnd;
 632         struct scsi_device *scsi_dev = lpfc_cmd->pCmd->device;
 633         struct lpfc_rport_data *rdata = scsi_dev->hostdata;
 634         struct lpfc_nodelist *ndlp = rdata->pnode;
 635
 636         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
 637                 return 0;
 638         }
 639
 640         psli = &phba->sli;
 641         piocbq = &(lpfc_cmd->cur_iocbq);
 642         piocb = &piocbq->iocb;
 643
 644         fcp_cmnd = lpfc_cmd->fcp_cmnd;
 645         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 646                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 647         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
 648
 649         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
 650
 651         piocb->ulpContext = ndlp->nlp_rpi;
 652         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
 653                 piocb->ulpFCP2Rcvy = 1;
 654         }
 655         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
 656
 657         /* ulpTimeout is only one byte */
 658         if (lpfc_cmd->timeout > 0xff) {
 659                 /*
 660                  * Do not timeout the command at the firmware level.
 661                  * The driver will provide the timeout mechanism.
 662                  */
 663                 piocb->ulpTimeout = 0;
 664         } else {
 665                 piocb->ulpTimeout = lpfc_cmd->timeout;
 666         }
 667
 668         lpfc_cmd->rdata = rdata;
 669
 670         switch (task_mgmt_cmd) {
 671         case FCP_LUN_RESET:
 672                 /* Issue LUN Reset to TGT <num> LUN <num> */
 673                 lpfc_printf_log(phba,
 674                                 KERN_INFO,
 675                                 LOG_FCP,
 676                                 "%d:0703 Issue LUN Reset to TGT %d LUN %d "
 677                                 "Data: x%x x%x\n",
 678                                 phba->brd_no,
 679                                 scsi_dev->id, scsi_dev->lun,
 680                                 ndlp->nlp_rpi, ndlp->nlp_flag);
 681
 682                 break;
 683         case FCP_ABORT_TASK_SET:
 684                 /* Issue Abort Task Set to TGT <num> LUN <num> */
 685                 lpfc_printf_log(phba,
 686                                 KERN_INFO,
 687                                 LOG_FCP,
 688                                 "%d:0701 Issue Abort Task Set to TGT %d LUN %d "
 689                                 "Data: x%x x%x\n",
 690                                 phba->brd_no,
 691                                 scsi_dev->id, scsi_dev->lun,
 692                                 ndlp->nlp_rpi, ndlp->nlp_flag);
 693
 694                 break;
 695         case FCP_TARGET_RESET:
 696                 /* Issue Target Reset to TGT <num> */
 697                 lpfc_printf_log(phba,
 698                                 KERN_INFO,
 699                                 LOG_FCP,
 700                                 "%d:0702 Issue Target Reset to TGT %d "
 701                                 "Data: x%x x%x\n",
 702                                 phba->brd_no,
 703                                 scsi_dev->id, ndlp->nlp_rpi,
 704                                 ndlp->nlp_flag);
 705                 break;
 706         }
 707
 708         return (1);
 709 }
 710
 711 static int
 712 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba)
 713 {
 714         struct lpfc_iocbq *iocbq;
 715         struct lpfc_iocbq *iocbqrsp;
 716         int ret;
 717
 718         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_TARGET_RESET);
 719         if (!ret)
 720                 return FAILED;
 721
 722         lpfc_cmd->scsi_hba = phba;
 723         iocbq = &lpfc_cmd->cur_iocbq;
 724         iocbqrsp = lpfc_sli_get_iocbq(phba);
 725
 726         if (!iocbqrsp)
 727                 return FAILED;
 728
 729         ret = lpfc_sli_issue_iocb_wait(phba,
 730                                        &phba->sli.ring[phba->sli.fcp_ring],
 731                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 732         if (ret != IOCB_SUCCESS) {
 733                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 734                 ret = FAILED;
 735         } else {
 736                 ret = SUCCESS;
 737                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 738                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 739                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 740                         (lpfc_cmd->result & IOERR_DRVR_MASK))
 741                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 742         }
 743
 744         lpfc_sli_release_iocbq(phba, iocbqrsp);
 745         return ret;
 746 }
 747
 748 const char *
 749 lpfc_info(struct Scsi_Host *host)
 750 {
 751         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata;
 752         int len;
 753         static char  lpfcinfobuf[384];
 754
 755         memset(lpfcinfobuf,0,384);
 756         if (phba && phba->pcidev){
 757                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
 758                 len = strlen(lpfcinfobuf);
 759                 snprintf(lpfcinfobuf + len,
 760                         384-len,
 761                         " on PCI bus %02x device %02x irq %d",
 762                         phba->pcidev->bus->number,
 763                         phba->pcidev->devfn,
 764                         phba->pcidev->irq);
 765                 len = strlen(lpfcinfobuf);
 766                 if (phba->Port[0]) {
 767                         snprintf(lpfcinfobuf + len,
 768                                  384-len,
 769                                  " port %s",
 770                                  phba->Port);
 771                 }
 772         }
 773         return lpfcinfobuf;
 774 }
 775
 776 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
 777 {
 778         unsigned long  poll_tmo_expires =
 779                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
 780
 781         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
 782                 mod_timer(&phba->fcp_poll_timer,
 783                           poll_tmo_expires);
 784 }
 785
 786 void lpfc_poll_start_timer(struct lpfc_hba * phba)
 787 {
 788         lpfc_poll_rearm_timer(phba);
 789 }
 790
 791 void lpfc_poll_timeout(unsigned long ptr)
 792 {
 793         struct lpfc_hba *phba = (struct lpfc_hba *)ptr;
 794         unsigned long iflag;
 795
 796         spin_lock_irqsave(phba->host->host_lock, iflag);
 797
 798         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 799                 lpfc_sli_poll_fcp_ring (phba);
 800                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 801                         lpfc_poll_rearm_timer(phba);
 802         }
 803
 804         spin_unlock_irqrestore(phba->host->host_lock, iflag);
 805 }
 806
 807 static int
 808 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 809 {
 810         struct lpfc_hba *phba =
 811                 (struct lpfc_hba *) cmnd->device->host->hostdata;
 812         struct lpfc_sli *psli = &phba->sli;
 813         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 814         struct lpfc_nodelist *ndlp = rdata->pnode;
 815         struct lpfc_scsi_buf *lpfc_cmd;
 816         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 817         int err;
 818
 819         err = fc_remote_port_chkready(rport);
 820         if (err) {
 821                 cmnd->result = err;
 822                 goto out_fail_command;
 823         }
 824
 825         /*
 826          * Catch race where our node has transitioned, but the
 827          * transport is still transitioning.
 828          */
 829         if (!ndlp) {
 830                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
 831                 goto out_fail_command;
 832         }
 833         lpfc_cmd = lpfc_get_scsi_buf (phba);
 834         if (lpfc_cmd == NULL) {
 835                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 836                                 "%d:0707 driver's buffer pool is empty, "
 837                                 "IO busied\n", phba->brd_no);
 838                 goto out_host_busy;
 839         }
 840
 841         /*
 842          * Store the midlayer's command structure for the completion phase
 843          * and complete the command initialization.
 844          */
 845         lpfc_cmd->pCmd  = cmnd;
 846         lpfc_cmd->rdata = rdata;
 847         lpfc_cmd->timeout = 0;
 848         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
 849         cmnd->scsi_done = done;
 850
 851         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
 852         if (err)
 853                 goto out_host_busy_free_buf;
 854
 855         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
 856
 857         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
 858                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
 859         if (err)
 860                 goto out_host_busy_free_buf;
 861
 862         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 863                 lpfc_sli_poll_fcp_ring(phba);
 864                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 865                         lpfc_poll_rearm_timer(phba);
 866         }
 867
 868         return 0;
 869
 870  out_host_busy_free_buf:
 871         lpfc_release_scsi_buf(phba, lpfc_cmd);
 872  out_host_busy:
 873         return SCSI_MLQUEUE_HOST_BUSY;
 874
 875  out_fail_command:
 876         done(cmnd);
 877         return 0;
 878 }
 879
 880
 881 static int
 882 lpfc_abort_handler(struct scsi_cmnd *cmnd)
 883 {
 884         struct Scsi_Host *shost = cmnd->device->host;
 885         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 886         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
 887         struct lpfc_iocbq *iocb;
 888         struct lpfc_iocbq *abtsiocb;
 889         struct lpfc_scsi_buf *lpfc_cmd;
 890         IOCB_t *cmd, *icmd;
 891         unsigned int loop_count = 0;
 892         int ret = SUCCESS;
 893
 894         lpfc_block_requests(phba);
 895         spin_lock_irq(shost->host_lock);
 896
 897         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
 898         BUG_ON(!lpfc_cmd);
 899
 900         /*
 901          * If pCmd field of the corresponding lpfc_scsi_buf structure
 902          * points to a different SCSI command, then the driver has
 903          * already completed this command, but the midlayer did not
 904          * see the completion before the eh fired.  Just return
 905          * SUCCESS.
 906          */
 907         iocb = &lpfc_cmd->cur_iocbq;
 908         if (lpfc_cmd->pCmd != cmnd)
 909                 goto out;
 910
 911         BUG_ON(iocb->context1 != lpfc_cmd);
 912
 913         abtsiocb = lpfc_sli_get_iocbq(phba);
 914         if (abtsiocb == NULL) {
 915                 ret = FAILED;
 916                 goto out;
 917         }
 918
 919         /*
 920          * The scsi command can not be in txq and it is in flight because the
 921          * pCmd is still pointig at the SCSI command we have to abort. There
 922          * is no need to search the txcmplq. Just send an abort to the FW.
 923          */
 924
 925         cmd = &iocb->iocb;
 926         icmd = &abtsiocb->iocb;
 927         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
 928         icmd->un.acxri.abortContextTag = cmd->ulpContext;
 929         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
 930
 931         icmd->ulpLe = 1;
 932         icmd->ulpClass = cmd->ulpClass;
 933         if (phba->hba_state >= LPFC_LINK_UP)
 934                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
 935         else
 936                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
 937
 938         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
 939         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
 940                 lpfc_sli_release_iocbq(phba, abtsiocb);
 941                 ret = FAILED;
 942                 goto out;
 943         }
 944
 945         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 946                 lpfc_sli_poll_fcp_ring (phba);
 947
 948         /* Wait for abort to complete */
 949         while (lpfc_cmd->pCmd == cmnd)
 950         {
 951                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 952                         lpfc_sli_poll_fcp_ring (phba);
 953
 954                 spin_unlock_irq(phba->host->host_lock);
 955                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
 956                 spin_lock_irq(phba->host->host_lock);
 957                 if (++loop_count
 958                     > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
 959                         break;
 960         }
 961
 962         if (lpfc_cmd->pCmd == cmnd) {
 963                 ret = FAILED;
 964                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 965                                 "%d:0748 abort handler timed out waiting for "
 966                                 "abort to complete: ret %#x, ID %d, LUN %d, "
 967                                 "snum %#lx\n",
 968                                 phba->brd_no,  ret, cmnd->device->id,
 969                                 cmnd->device->lun, cmnd->serial_number);
 970         }
 971
 972  out:
 973         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 974                         "%d:0749 SCSI Layer I/O Abort Request "
 975                         "Status x%x ID %d LUN %d snum %#lx\n",
 976                         phba->brd_no, ret, cmnd->device->id,
 977                         cmnd->device->lun, cmnd->serial_number);
 978
 979         spin_unlock_irq(shost->host_lock);
 980         lpfc_unblock_requests(phba);
 981
 982         return ret;
 983 }
 984
 985 static int
 986 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 987 {
 988         struct Scsi_Host *shost = cmnd->device->host;
 989         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 990         struct lpfc_scsi_buf *lpfc_cmd;
 991         struct lpfc_iocbq *iocbq, *iocbqrsp;
 992         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 993         struct lpfc_nodelist *pnode = rdata->pnode;
 994         uint32_t cmd_result = 0, cmd_status = 0;
 995         int ret = FAILED;
 996         int cnt, loopcnt;
 997
 998         lpfc_block_requests(phba);
 999         spin_lock_irq(shost->host_lock);
1000         /*
1001          * If target is not in a MAPPED state, delay the reset until
1002          * target is rediscovered or nodev timeout expires.
1003          */
1004         while ( 1 ) {
1005                 if (!pnode)
1006                         break;
1007
1008                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
1009                         spin_unlock_irq(phba->host->host_lock);
1010                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
1011                         spin_lock_irq(phba->host->host_lock);
1012                 }
1013                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
1014                         break;
1015         }
1016
1017         lpfc_cmd = lpfc_get_scsi_buf (phba);
1018         if (lpfc_cmd == NULL)
1019                 goto out;
1020
1021         lpfc_cmd->pCmd = cmnd;
1022         lpfc_cmd->timeout = 60;
1023         lpfc_cmd->scsi_hba = phba;
1024
1025         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_LUN_RESET);
1026         if (!ret)
1027                 goto out_free_scsi_buf;
1028
1029         iocbq = &lpfc_cmd->cur_iocbq;
1030
1031         /* get a buffer for this IOCB command response */
1032         iocbqrsp = lpfc_sli_get_iocbq(phba);
1033         if (iocbqrsp == NULL)
1034                 goto out_free_scsi_buf;
1035
1036         ret = lpfc_sli_issue_iocb_wait(phba,
1037                                        &phba->sli.ring[phba->sli.fcp_ring],
1038                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
1039         if (ret == IOCB_SUCCESS)
1040                 ret = SUCCESS;
1041
1042
1043         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
1044         cmd_status = iocbqrsp->iocb.ulpStatus;
1045
1046         lpfc_sli_release_iocbq(phba, iocbqrsp);
1047         lpfc_release_scsi_buf(phba, lpfc_cmd);
1048
1049         /*
1050          * All outstanding txcmplq I/Os should have been aborted by the device.
1051          * Unfortunately, some targets do not abide by this forcing the driver
1052          * to double check.
1053          */
1054         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1055                                 cmnd->device->id, cmnd->device->lun,
1056                                 LPFC_CTX_LUN);
1057         if (cnt)
1058                 lpfc_sli_abort_iocb(phba,
1059                                     &phba->sli.ring[phba->sli.fcp_ring],
1060                                     cmnd->device->id, cmnd->device->lun,
1061                                     0, LPFC_CTX_LUN);
1062         loopcnt = 0;
1063         while(cnt) {
1064                 spin_unlock_irq(phba->host->host_lock);
1065                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1066                 spin_lock_irq(phba->host->host_lock);
1067
1068                 if (++loopcnt
1069                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1070                         break;
1071
1072                 cnt = lpfc_sli_sum_iocb(phba,
1073                                         &phba->sli.ring[phba->sli.fcp_ring],
1074                                         cmnd->device->id, cmnd->device->lun,
1075                                         LPFC_CTX_LUN);
1076         }
1077
1078         if (cnt) {
1079                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1080                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
1081                         phba->brd_no, cnt);
1082                 ret = FAILED;
1083         }
1084
1085 out_free_scsi_buf:
1086         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1087                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
1088                         "Data: x%x x%x x%x\n",
1089                         phba->brd_no, cmnd->device->id,cmnd->device->lun,
1090                         ret, cmd_status, cmd_result);
1091
1092 out:
1093         spin_unlock_irq(shost->host_lock);
1094         lpfc_unblock_requests(phba);
1095         return ret;
1096 }
1097
1098 static int
1099 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1100 {
1101         struct Scsi_Host *shost = cmnd->device->host;
1102         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
1103         struct lpfc_nodelist *ndlp = NULL;
1104         int match;
1105         int ret = FAILED, i, err_count = 0;
1106         int cnt, loopcnt;
1107         unsigned int midlayer_id = 0;
1108         struct lpfc_scsi_buf * lpfc_cmd;
1109
1110         lpfc_block_requests(phba);
1111         spin_lock_irq(shost->host_lock);
1112
1113         lpfc_cmd = lpfc_get_scsi_buf(phba);
1114         if (lpfc_cmd == NULL)
1115                 goto out;
1116
1117         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1118         lpfc_cmd->timeout = 60;
1119         lpfc_cmd->pCmd = cmnd;
1120         lpfc_cmd->scsi_hba = phba;
1121
1122         /*
1123          * Since the driver manages a single bus device, reset all
1124          * targets known to the driver.  Should any target reset
1125          * fail, this routine returns failure to the midlayer.
1126          */
1127         midlayer_id = cmnd->device->id;
1128         for (i = 0; i < MAX_FCP_TARGET; i++) {
1129                 /* Search the mapped list for this target ID */
1130                 match = 0;
1131                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1132                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1133                                 match = 1;
1134                                 break;
1135                         }
1136                 }
1137                 if (!match)
1138                         continue;
1139
1140                 lpfc_cmd->pCmd->device->id = i;
1141                 lpfc_cmd->pCmd->device->hostdata = ndlp->rport->dd_data;
1142                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba);
1143                 if (ret != SUCCESS) {
1144                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1145                                 "%d:0713 Bus Reset on target %d failed\n",
1146                                 phba->brd_no, i);
1147                         err_count++;
1148                 }
1149         }
1150
1151         if (err_count == 0)
1152                 ret = SUCCESS;
1153
1154         lpfc_release_scsi_buf(phba, lpfc_cmd);
1155
1156         /*
1157          * All outstanding txcmplq I/Os should have been aborted by
1158          * the targets.  Unfortunately, some targets do not abide by
1159          * this forcing the driver to double check.
1160          */
1161         cmnd->device->id = midlayer_id;
1162         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1163                                 0, 0, LPFC_CTX_HOST);
1164         if (cnt)
1165                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1166                                     0, 0, 0, LPFC_CTX_HOST);
1167         loopcnt = 0;
1168         while(cnt) {
1169                 spin_unlock_irq(phba->host->host_lock);
1170                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1171                 spin_lock_irq(phba->host->host_lock);
1172
1173                 if (++loopcnt
1174                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1175                         break;
1176
1177                 cnt = lpfc_sli_sum_iocb(phba,
1178                                         &phba->sli.ring[phba->sli.fcp_ring],
1179                                         0, 0, LPFC_CTX_HOST);
1180         }
1181
1182         if (cnt) {
1183                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1184                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1185                    phba->brd_no, cnt, i);
1186                 ret = FAILED;
1187         }
1188
1189         lpfc_printf_log(phba,
1190                         KERN_ERR,
1191                         LOG_FCP,
1192                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1193                         phba->brd_no, ret);
1194 out:
1195         spin_unlock_irq(shost->host_lock);
1196         lpfc_unblock_requests(phba);
1197         return ret;
1198 }
1199
1200 static int
1201 lpfc_slave_alloc(struct scsi_device *sdev)
1202 {
1203         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata;
1204         struct lpfc_scsi_buf *scsi_buf = NULL;
1205         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1206         uint32_t total = 0, i;
1207         uint32_t num_to_alloc = 0;
1208         unsigned long flags;
1209
1210         if (!rport || fc_remote_port_chkready(rport))
1211                 return -ENXIO;
1212
1213         sdev->hostdata = rport->dd_data;
1214
1215         /*
1216          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1217          * available list of scsi buffers.  Don't allocate more than the
1218          * HBA limit conveyed to the midlayer via the host structure.  The
1219          * formula accounts for the lun_queue_depth + error handlers + 1
1220          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1221          */
1222         total = phba->total_scsi_bufs;
1223         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1224         if (total >= phba->cfg_hba_queue_depth) {
1225                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1226                                 "%d:0704 At limitation of %d preallocated "
1227                                 "command buffers\n", phba->brd_no, total);
1228                 return 0;
1229         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1230                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1231                                 "%d:0705 Allocation request of %d command "
1232                                 "buffers will exceed max of %d.  Reducing "
1233                                 "allocation request to %d.\n", phba->brd_no,
1234                                 num_to_alloc, phba->cfg_hba_queue_depth,
1235                                 (phba->cfg_hba_queue_depth - total));
1236                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1237         }
1238
1239         for (i = 0; i < num_to_alloc; i++) {
1240                 scsi_buf = lpfc_new_scsi_buf(phba);
1241                 if (!scsi_buf) {
1242                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1243                                         "%d:0706 Failed to allocate command "
1244                                         "buffer\n", phba->brd_no);
1245                         break;
1246                 }
1247
1248                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1249                 phba->total_scsi_bufs++;
1250                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1251                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1252         }
1253         return 0;
1254 }
1255
1256 static int
1257 lpfc_slave_configure(struct scsi_device *sdev)
1258 {
1259         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata;
1260         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1261
1262         if (sdev->tagged_supported)
1263                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1264         else
1265                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1266
1267         /*
1268          * Initialize the fc transport attributes for the target
1269          * containing this scsi device.  Also note that the driver's
1270          * target pointer is stored in the starget_data for the
1271          * driver's sysfs entry point functions.
1272          */
1273         rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;
1274
1275         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1276                 lpfc_sli_poll_fcp_ring(phba);
1277                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1278                         lpfc_poll_rearm_timer(phba);
1279         }
1280
1281         return 0;
1282 }
1283
1284 static void
1285 lpfc_slave_destroy(struct scsi_device *sdev)
1286 {
1287         sdev->hostdata = NULL;
1288         return;
1289 }
1290
1291 struct scsi_host_template lpfc_template = {
1292         .module                 = THIS_MODULE,
1293         .name                   = LPFC_DRIVER_NAME,
1294         .info                   = lpfc_info,
1295         .queuecommand           = lpfc_queuecommand,
1296         .eh_abort_handler       = lpfc_abort_handler,
1297         .eh_device_reset_handler= lpfc_reset_lun_handler,
1298         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1299         .slave_alloc            = lpfc_slave_alloc,
1300         .slave_configure        = lpfc_slave_configure,
1301         .slave_destroy          = lpfc_slave_destroy,
1302         .this_id                = -1,
1303         .sg_tablesize           = LPFC_SG_SEG_CNT,
1304         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1305         .use_clustering         = ENABLE_CLUSTERING,
1306         .shost_attrs            = lpfc_host_attrs,
1307         .max_sectors            = 0xFFFF,
1308 };