Merge tag 'r8169-20060920-00' of git://electric-eye.fr.zoreil.com/home/romieu/linux...
[linux-2.6] / 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 #include <linux/delay.h>
25
26 #include <scsi/scsi.h>
27 #include <scsi/scsi_device.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_tcq.h>
30 #include <scsi/scsi_transport_fc.h>
31
32 #include "lpfc_version.h"
33 #include "lpfc_hw.h"
34 #include "lpfc_sli.h"
35 #include "lpfc_disc.h"
36 #include "lpfc_scsi.h"
37 #include "lpfc.h"
38 #include "lpfc_logmsg.h"
39 #include "lpfc_crtn.h"
40
41 #define LPFC_RESET_WAIT  2
42 #define LPFC_ABORT_WAIT  2
43
44
45 /*
46  * This routine allocates a scsi buffer, which contains all the necessary
47  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
48  * contains information to build the IOCB.  The DMAable region contains
49  * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
50  * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
51  * and the BPL BDE is setup in the IOCB.
52  */
53 static struct lpfc_scsi_buf *
54 lpfc_new_scsi_buf(struct lpfc_hba * phba)
55 {
56         struct lpfc_scsi_buf *psb;
57         struct ulp_bde64 *bpl;
58         IOCB_t *iocb;
59         dma_addr_t pdma_phys;
60         uint16_t iotag;
61
62         psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
63         if (!psb)
64                 return NULL;
65         memset(psb, 0, sizeof (struct lpfc_scsi_buf));
66         psb->scsi_hba = phba;
67
68         /*
69          * Get memory from the pci pool to map the virt space to pci bus space
70          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
71          * struct fcp_rsp and the number of bde's necessary to support the
72          * sg_tablesize.
73          */
74         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
75                                                         &psb->dma_handle);
76         if (!psb->data) {
77                 kfree(psb);
78                 return NULL;
79         }
80
81         /* Initialize virtual ptrs to dma_buf region. */
82         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
83
84         /* Allocate iotag for psb->cur_iocbq. */
85         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
86         if (iotag == 0) {
87                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
88                               psb->data, psb->dma_handle);
89                 kfree (psb);
90                 return NULL;
91         }
92         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
93
94         psb->fcp_cmnd = psb->data;
95         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
96         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
97                                                         sizeof(struct fcp_rsp);
98
99         /* Initialize local short-hand pointers. */
100         bpl = psb->fcp_bpl;
101         pdma_phys = psb->dma_handle;
102
103         /*
104          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
105          * list bdes.  Initialize the first two and leave the rest for
106          * queuecommand.
107          */
108         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
109         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
110         bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
111         bpl->tus.f.bdeFlags = BUFF_USE_CMND;
112         bpl->tus.w = le32_to_cpu(bpl->tus.w);
113         bpl++;
114
115         /* Setup the physical region for the FCP RSP */
116         pdma_phys += sizeof (struct fcp_cmnd);
117         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
118         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
119         bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
120         bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
121         bpl->tus.w = le32_to_cpu(bpl->tus.w);
122
123         /*
124          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
125          * initialize it with all known data now.
126          */
127         pdma_phys += (sizeof (struct fcp_rsp));
128         iocb = &psb->cur_iocbq.iocb;
129         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
130         iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
131         iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
132         iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
133         iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
134         iocb->ulpBdeCount = 1;
135         iocb->ulpClass = CLASS3;
136
137         return psb;
138 }
139
140 static struct lpfc_scsi_buf*
141 lpfc_get_scsi_buf(struct lpfc_hba * phba)
142 {
143         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
144         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
145         unsigned long iflag = 0;
146
147         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
148         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
149         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
150         return  lpfc_cmd;
151 }
152
153 static void
154 lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
155 {
156         unsigned long iflag = 0;
157
158         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
159         psb->pCmd = NULL;
160         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
161         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
162 }
163
164 static int
165 lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
166 {
167         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
168         struct scatterlist *sgel = NULL;
169         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
170         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
171         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
172         dma_addr_t physaddr;
173         uint32_t i, num_bde = 0;
174         int datadir = scsi_cmnd->sc_data_direction;
175         int dma_error;
176
177         /*
178          * There are three possibilities here - use scatter-gather segment, use
179          * the single mapping, or neither.  Start the lpfc command prep by
180          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
181          * data bde entry.
182          */
183         bpl += 2;
184         if (scsi_cmnd->use_sg) {
185                 /*
186                  * The driver stores the segment count returned from pci_map_sg
187                  * because this a count of dma-mappings used to map the use_sg
188                  * pages.  They are not guaranteed to be the same for those
189                  * architectures that implement an IOMMU.
190                  */
191                 sgel = (struct scatterlist *)scsi_cmnd->request_buffer;
192                 lpfc_cmd->seg_cnt = dma_map_sg(&phba->pcidev->dev, sgel,
193                                                 scsi_cmnd->use_sg, datadir);
194                 if (lpfc_cmd->seg_cnt == 0)
195                         return 1;
196
197                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
198                         printk(KERN_ERR "%s: Too many sg segments from "
199                                "dma_map_sg.  Config %d, seg_cnt %d",
200                                __FUNCTION__, phba->cfg_sg_seg_cnt,
201                                lpfc_cmd->seg_cnt);
202                         dma_unmap_sg(&phba->pcidev->dev, sgel,
203                                      lpfc_cmd->seg_cnt, datadir);
204                         return 1;
205                 }
206
207                 /*
208                  * The driver established a maximum scatter-gather segment count
209                  * during probe that limits the number of sg elements in any
210                  * single scsi command.  Just run through the seg_cnt and format
211                  * the bde's.
212                  */
213                 for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
214                         physaddr = sg_dma_address(sgel);
215                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
216                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
217                         bpl->tus.f.bdeSize = sg_dma_len(sgel);
218                         if (datadir == DMA_TO_DEVICE)
219                                 bpl->tus.f.bdeFlags = 0;
220                         else
221                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
222                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
223                         bpl++;
224                         sgel++;
225                         num_bde++;
226                 }
227         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
228                 physaddr = dma_map_single(&phba->pcidev->dev,
229                                           scsi_cmnd->request_buffer,
230                                           scsi_cmnd->request_bufflen,
231                                           datadir);
232                 dma_error = dma_mapping_error(physaddr);
233                 if (dma_error) {
234                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
235                                 "%d:0718 Unable to dma_map_single "
236                                 "request_buffer: x%x\n",
237                                 phba->brd_no, dma_error);
238                         return 1;
239                 }
240
241                 lpfc_cmd->nonsg_phys = physaddr;
242                 bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
243                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
244                 bpl->tus.f.bdeSize = scsi_cmnd->request_bufflen;
245                 if (datadir == DMA_TO_DEVICE)
246                         bpl->tus.f.bdeFlags = 0;
247                 else
248                         bpl->tus.f.bdeFlags = BUFF_USE_RCV;
249                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
250                 num_bde = 1;
251                 bpl++;
252         }
253
254         /*
255          * Finish initializing those IOCB fields that are dependent on the
256          * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
257          * reinitialized since all iocb memory resources are used many times
258          * for transmit, receive, and continuation bpl's.
259          */
260         iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
261         iocb_cmd->un.fcpi64.bdl.bdeSize +=
262                 (num_bde * sizeof (struct ulp_bde64));
263         iocb_cmd->ulpBdeCount = 1;
264         iocb_cmd->ulpLe = 1;
265         fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
266         return 0;
267 }
268
269 static void
270 lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
271 {
272         /*
273          * There are only two special cases to consider.  (1) the scsi command
274          * requested scatter-gather usage or (2) the scsi command allocated
275          * a request buffer, but did not request use_sg.  There is a third
276          * case, but it does not require resource deallocation.
277          */
278         if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
279                 dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
280                                 psb->seg_cnt, psb->pCmd->sc_data_direction);
281         } else {
282                  if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
283                         dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
284                                                 psb->pCmd->request_bufflen,
285                                                 psb->pCmd->sc_data_direction);
286                  }
287         }
288 }
289
290 static void
291 lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
292 {
293         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
294         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
295         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
296         struct lpfc_hba *phba = lpfc_cmd->scsi_hba;
297         uint32_t fcpi_parm = lpfc_cmd->cur_iocbq.iocb.un.fcpi.fcpi_parm;
298         uint32_t resp_info = fcprsp->rspStatus2;
299         uint32_t scsi_status = fcprsp->rspStatus3;
300         uint32_t host_status = DID_OK;
301         uint32_t rsplen = 0;
302
303         /*
304          *  If this is a task management command, there is no
305          *  scsi packet associated with this lpfc_cmd.  The driver
306          *  consumes it.
307          */
308         if (fcpcmd->fcpCntl2) {
309                 scsi_status = 0;
310                 goto out;
311         }
312
313         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
314                         "%d:0730 FCP command failed: RSP "
315                         "Data: x%x x%x x%x x%x x%x x%x\n",
316                         phba->brd_no, resp_info, scsi_status,
317                         be32_to_cpu(fcprsp->rspResId),
318                         be32_to_cpu(fcprsp->rspSnsLen),
319                         be32_to_cpu(fcprsp->rspRspLen),
320                         fcprsp->rspInfo3);
321
322         if (resp_info & RSP_LEN_VALID) {
323                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
324                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
325                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
326                         host_status = DID_ERROR;
327                         goto out;
328                 }
329         }
330
331         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
332                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
333                 if (snslen > SCSI_SENSE_BUFFERSIZE)
334                         snslen = SCSI_SENSE_BUFFERSIZE;
335
336                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
337         }
338
339         cmnd->resid = 0;
340         if (resp_info & RESID_UNDER) {
341                 cmnd->resid = be32_to_cpu(fcprsp->rspResId);
342
343                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
344                                 "%d:0716 FCP Read Underrun, expected %d, "
345                                 "residual %d Data: x%x x%x x%x\n", phba->brd_no,
346                                 be32_to_cpu(fcpcmd->fcpDl), cmnd->resid,
347                                 fcpi_parm, cmnd->cmnd[0], cmnd->underflow);
348
349                 /*
350                  * The cmnd->underflow is the minimum number of bytes that must
351                  * be transfered for this command.  Provided a sense condition
352                  * is not present, make sure the actual amount transferred is at
353                  * least the underflow value or fail.
354                  */
355                 if (!(resp_info & SNS_LEN_VALID) &&
356                     (scsi_status == SAM_STAT_GOOD) &&
357                     (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
358                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
359                                         "%d:0717 FCP command x%x residual "
360                                         "underrun converted to error "
361                                         "Data: x%x x%x x%x\n", phba->brd_no,
362                                         cmnd->cmnd[0], cmnd->request_bufflen,
363                                         cmnd->resid, cmnd->underflow);
364
365                         host_status = DID_ERROR;
366                 }
367         } else if (resp_info & RESID_OVER) {
368                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
369                                 "%d:0720 FCP command x%x residual "
370                                 "overrun error. Data: x%x x%x \n",
371                                 phba->brd_no, cmnd->cmnd[0],
372                                 cmnd->request_bufflen, cmnd->resid);
373                 host_status = DID_ERROR;
374
375         /*
376          * Check SLI validation that all the transfer was actually done
377          * (fcpi_parm should be zero). Apply check only to reads.
378          */
379         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
380                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
381                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
382                         "%d:0734 FCP Read Check Error Data: "
383                         "x%x x%x x%x x%x\n", phba->brd_no,
384                         be32_to_cpu(fcpcmd->fcpDl),
385                         be32_to_cpu(fcprsp->rspResId),
386                         fcpi_parm, cmnd->cmnd[0]);
387                 host_status = DID_ERROR;
388                 cmnd->resid = cmnd->request_bufflen;
389         }
390
391  out:
392         cmnd->result = ScsiResult(host_status, scsi_status);
393 }
394
395 static void
396 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
397                         struct lpfc_iocbq *pIocbOut)
398 {
399         struct lpfc_scsi_buf *lpfc_cmd =
400                 (struct lpfc_scsi_buf *) pIocbIn->context1;
401         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
402         struct lpfc_nodelist *pnode = rdata->pnode;
403         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
404         int result;
405         struct scsi_device *sdev, *tmp_sdev;
406         int depth = 0;
407
408         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
409         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
410
411         if (lpfc_cmd->status) {
412                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
413                     (lpfc_cmd->result & IOERR_DRVR_MASK))
414                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
415                 else if (lpfc_cmd->status >= IOSTAT_CNT)
416                         lpfc_cmd->status = IOSTAT_DEFAULT;
417
418                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
419                                 "%d:0729 FCP cmd x%x failed <%d/%d> status: "
420                                 "x%x result: x%x Data: x%x x%x\n",
421                                 phba->brd_no, cmd->cmnd[0], cmd->device->id,
422                                 cmd->device->lun, lpfc_cmd->status,
423                                 lpfc_cmd->result, pIocbOut->iocb.ulpContext,
424                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
425
426                 switch (lpfc_cmd->status) {
427                 case IOSTAT_FCP_RSP_ERROR:
428                         /* Call FCP RSP handler to determine result */
429                         lpfc_handle_fcp_err(lpfc_cmd);
430                         break;
431                 case IOSTAT_NPORT_BSY:
432                 case IOSTAT_FABRIC_BSY:
433                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
434                         break;
435                 default:
436                         cmd->result = ScsiResult(DID_ERROR, 0);
437                         break;
438                 }
439
440                 if ((pnode == NULL )
441                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
442                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
443         } else {
444                 cmd->result = ScsiResult(DID_OK, 0);
445         }
446
447         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
448                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
449
450                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
451                                 "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
452                                 "SNS x%x x%x Data: x%x x%x\n",
453                                 phba->brd_no, cmd->device->id,
454                                 cmd->device->lun, cmd, cmd->result,
455                                 *lp, *(lp + 3), cmd->retries, cmd->resid);
456         }
457
458         result = cmd->result;
459         sdev = cmd->device;
460         cmd->scsi_done(cmd);
461
462         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
463                 lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
464                 lpfc_release_scsi_buf(phba, lpfc_cmd);
465                 return;
466         }
467
468         if (!result && pnode != NULL &&
469            ((jiffies - pnode->last_ramp_up_time) >
470                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
471            ((jiffies - pnode->last_q_full_time) >
472                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
473            (phba->cfg_lun_queue_depth > sdev->queue_depth)) {
474                 shost_for_each_device(tmp_sdev, sdev->host) {
475                         if (phba->cfg_lun_queue_depth > tmp_sdev->queue_depth) {
476                                 if (tmp_sdev->id != sdev->id)
477                                         continue;
478                                 if (tmp_sdev->ordered_tags)
479                                         scsi_adjust_queue_depth(tmp_sdev,
480                                                 MSG_ORDERED_TAG,
481                                                 tmp_sdev->queue_depth+1);
482                                 else
483                                         scsi_adjust_queue_depth(tmp_sdev,
484                                                 MSG_SIMPLE_TAG,
485                                                 tmp_sdev->queue_depth+1);
486
487                                 pnode->last_ramp_up_time = jiffies;
488                         }
489                 }
490         }
491
492         /*
493          * Check for queue full.  If the lun is reporting queue full, then
494          * back off the lun queue depth to prevent target overloads.
495          */
496         if (result == SAM_STAT_TASK_SET_FULL && pnode != NULL) {
497                 pnode->last_q_full_time = jiffies;
498
499                 shost_for_each_device(tmp_sdev, sdev->host) {
500                         if (tmp_sdev->id != sdev->id)
501                                 continue;
502                         depth = scsi_track_queue_full(tmp_sdev,
503                                         tmp_sdev->queue_depth - 1);
504                 }
505                 /*
506                  * The queue depth cannot be lowered any more.
507                  * Modify the returned error code to store
508                  * the final depth value set by
509                  * scsi_track_queue_full.
510                  */
511                 if (depth == -1)
512                         depth = sdev->host->cmd_per_lun;
513
514                 if (depth) {
515                         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
516                                 "%d:0711 detected queue full - lun queue depth "
517                                 " adjusted to %d.\n", phba->brd_no, depth);
518                 }
519         }
520
521         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
522         lpfc_release_scsi_buf(phba, lpfc_cmd);
523 }
524
525 static void
526 lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
527                         struct lpfc_nodelist *pnode)
528 {
529         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
530         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
531         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
532         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
533         int datadir = scsi_cmnd->sc_data_direction;
534
535         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
536         /* clear task management bits */
537         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
538
539         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
540                         &lpfc_cmd->fcp_cmnd->fcp_lun);
541
542         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
543
544         if (scsi_cmnd->device->tagged_supported) {
545                 switch (scsi_cmnd->tag) {
546                 case HEAD_OF_QUEUE_TAG:
547                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
548                         break;
549                 case ORDERED_QUEUE_TAG:
550                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
551                         break;
552                 default:
553                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
554                         break;
555                 }
556         } else
557                 fcp_cmnd->fcpCntl1 = 0;
558
559         /*
560          * There are three possibilities here - use scatter-gather segment, use
561          * the single mapping, or neither.  Start the lpfc command prep by
562          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
563          * data bde entry.
564          */
565         if (scsi_cmnd->use_sg) {
566                 if (datadir == DMA_TO_DEVICE) {
567                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
568                         iocb_cmd->un.fcpi.fcpi_parm = 0;
569                         iocb_cmd->ulpPU = 0;
570                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
571                         phba->fc4OutputRequests++;
572                 } else {
573                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
574                         iocb_cmd->ulpPU = PARM_READ_CHECK;
575                         iocb_cmd->un.fcpi.fcpi_parm =
576                                 scsi_cmnd->request_bufflen;
577                         fcp_cmnd->fcpCntl3 = READ_DATA;
578                         phba->fc4InputRequests++;
579                 }
580         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
581                 if (datadir == DMA_TO_DEVICE) {
582                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
583                         iocb_cmd->un.fcpi.fcpi_parm = 0;
584                         iocb_cmd->ulpPU = 0;
585                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
586                         phba->fc4OutputRequests++;
587                 } else {
588                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
589                         iocb_cmd->ulpPU = PARM_READ_CHECK;
590                         iocb_cmd->un.fcpi.fcpi_parm =
591                                 scsi_cmnd->request_bufflen;
592                         fcp_cmnd->fcpCntl3 = READ_DATA;
593                         phba->fc4InputRequests++;
594                 }
595         } else {
596                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
597                 iocb_cmd->un.fcpi.fcpi_parm = 0;
598                 iocb_cmd->ulpPU = 0;
599                 fcp_cmnd->fcpCntl3 = 0;
600                 phba->fc4ControlRequests++;
601         }
602
603         /*
604          * Finish initializing those IOCB fields that are independent
605          * of the scsi_cmnd request_buffer
606          */
607         piocbq->iocb.ulpContext = pnode->nlp_rpi;
608         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
609                 piocbq->iocb.ulpFCP2Rcvy = 1;
610
611         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
612         piocbq->context1  = lpfc_cmd;
613         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
614         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
615 }
616
617 static int
618 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
619                              struct lpfc_scsi_buf *lpfc_cmd,
620                              unsigned int lun,
621                              uint8_t task_mgmt_cmd)
622 {
623         struct lpfc_sli *psli;
624         struct lpfc_iocbq *piocbq;
625         IOCB_t *piocb;
626         struct fcp_cmnd *fcp_cmnd;
627         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
628         struct lpfc_nodelist *ndlp = rdata->pnode;
629
630         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
631                 return 0;
632         }
633
634         psli = &phba->sli;
635         piocbq = &(lpfc_cmd->cur_iocbq);
636         piocb = &piocbq->iocb;
637
638         fcp_cmnd = lpfc_cmd->fcp_cmnd;
639         int_to_scsilun(lun, &lpfc_cmd->fcp_cmnd->fcp_lun);
640         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
641
642         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
643
644         piocb->ulpContext = ndlp->nlp_rpi;
645         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
646                 piocb->ulpFCP2Rcvy = 1;
647         }
648         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
649
650         /* ulpTimeout is only one byte */
651         if (lpfc_cmd->timeout > 0xff) {
652                 /*
653                  * Do not timeout the command at the firmware level.
654                  * The driver will provide the timeout mechanism.
655                  */
656                 piocb->ulpTimeout = 0;
657         } else {
658                 piocb->ulpTimeout = lpfc_cmd->timeout;
659         }
660
661         return (1);
662 }
663
664 static int
665 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba,
666                     unsigned  tgt_id, unsigned int lun,
667                     struct lpfc_rport_data *rdata)
668 {
669         struct lpfc_iocbq *iocbq;
670         struct lpfc_iocbq *iocbqrsp;
671         int ret;
672
673         lpfc_cmd->rdata = rdata;
674         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, lun,
675                                            FCP_TARGET_RESET);
676         if (!ret)
677                 return FAILED;
678
679         lpfc_cmd->scsi_hba = phba;
680         iocbq = &lpfc_cmd->cur_iocbq;
681         iocbqrsp = lpfc_sli_get_iocbq(phba);
682
683         if (!iocbqrsp)
684                 return FAILED;
685
686         /* Issue Target Reset to TGT <num> */
687         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
688                         "%d:0702 Issue Target Reset to TGT %d "
689                         "Data: x%x x%x\n",
690                         phba->brd_no, tgt_id, rdata->pnode->nlp_rpi,
691                         rdata->pnode->nlp_flag);
692
693         ret = lpfc_sli_issue_iocb_wait(phba,
694                                        &phba->sli.ring[phba->sli.fcp_ring],
695                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
696         if (ret != IOCB_SUCCESS) {
697                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
698                 ret = FAILED;
699         } else {
700                 ret = SUCCESS;
701                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
702                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
703                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
704                         (lpfc_cmd->result & IOERR_DRVR_MASK))
705                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
706         }
707
708         lpfc_sli_release_iocbq(phba, iocbqrsp);
709         return ret;
710 }
711
712 const char *
713 lpfc_info(struct Scsi_Host *host)
714 {
715         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata;
716         int len;
717         static char  lpfcinfobuf[384];
718
719         memset(lpfcinfobuf,0,384);
720         if (phba && phba->pcidev){
721                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
722                 len = strlen(lpfcinfobuf);
723                 snprintf(lpfcinfobuf + len,
724                         384-len,
725                         " on PCI bus %02x device %02x irq %d",
726                         phba->pcidev->bus->number,
727                         phba->pcidev->devfn,
728                         phba->pcidev->irq);
729                 len = strlen(lpfcinfobuf);
730                 if (phba->Port[0]) {
731                         snprintf(lpfcinfobuf + len,
732                                  384-len,
733                                  " port %s",
734                                  phba->Port);
735                 }
736         }
737         return lpfcinfobuf;
738 }
739
740 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
741 {
742         unsigned long  poll_tmo_expires =
743                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
744
745         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
746                 mod_timer(&phba->fcp_poll_timer,
747                           poll_tmo_expires);
748 }
749
750 void lpfc_poll_start_timer(struct lpfc_hba * phba)
751 {
752         lpfc_poll_rearm_timer(phba);
753 }
754
755 void lpfc_poll_timeout(unsigned long ptr)
756 {
757         struct lpfc_hba *phba = (struct lpfc_hba *)ptr;
758         unsigned long iflag;
759
760         spin_lock_irqsave(phba->host->host_lock, iflag);
761
762         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
763                 lpfc_sli_poll_fcp_ring (phba);
764                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
765                         lpfc_poll_rearm_timer(phba);
766         }
767
768         spin_unlock_irqrestore(phba->host->host_lock, iflag);
769 }
770
771 static int
772 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
773 {
774         struct lpfc_hba *phba =
775                 (struct lpfc_hba *) cmnd->device->host->hostdata;
776         struct lpfc_sli *psli = &phba->sli;
777         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
778         struct lpfc_nodelist *ndlp = rdata->pnode;
779         struct lpfc_scsi_buf *lpfc_cmd;
780         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
781         int err;
782
783         err = fc_remote_port_chkready(rport);
784         if (err) {
785                 cmnd->result = err;
786                 goto out_fail_command;
787         }
788
789         /*
790          * Catch race where our node has transitioned, but the
791          * transport is still transitioning.
792          */
793         if (!ndlp) {
794                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
795                 goto out_fail_command;
796         }
797         lpfc_cmd = lpfc_get_scsi_buf (phba);
798         if (lpfc_cmd == NULL) {
799                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
800                                 "%d:0707 driver's buffer pool is empty, "
801                                 "IO busied\n", phba->brd_no);
802                 goto out_host_busy;
803         }
804
805         /*
806          * Store the midlayer's command structure for the completion phase
807          * and complete the command initialization.
808          */
809         lpfc_cmd->pCmd  = cmnd;
810         lpfc_cmd->rdata = rdata;
811         lpfc_cmd->timeout = 0;
812         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
813         cmnd->scsi_done = done;
814
815         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
816         if (err)
817                 goto out_host_busy_free_buf;
818
819         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
820
821         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
822                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
823         if (err)
824                 goto out_host_busy_free_buf;
825
826         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
827                 lpfc_sli_poll_fcp_ring(phba);
828                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
829                         lpfc_poll_rearm_timer(phba);
830         }
831
832         return 0;
833
834  out_host_busy_free_buf:
835         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
836         lpfc_release_scsi_buf(phba, lpfc_cmd);
837  out_host_busy:
838         return SCSI_MLQUEUE_HOST_BUSY;
839
840  out_fail_command:
841         done(cmnd);
842         return 0;
843 }
844
845 static void
846 lpfc_block_error_handler(struct scsi_cmnd *cmnd)
847 {
848         struct Scsi_Host *shost = cmnd->device->host;
849         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
850
851         spin_lock_irq(shost->host_lock);
852         while (rport->port_state == FC_PORTSTATE_BLOCKED) {
853                 spin_unlock_irq(shost->host_lock);
854                 msleep(1000);
855                 spin_lock_irq(shost->host_lock);
856         }
857         spin_unlock_irq(shost->host_lock);
858         return;
859 }
860
861 static int
862 lpfc_abort_handler(struct scsi_cmnd *cmnd)
863 {
864         struct Scsi_Host *shost = cmnd->device->host;
865         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
866         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
867         struct lpfc_iocbq *iocb;
868         struct lpfc_iocbq *abtsiocb;
869         struct lpfc_scsi_buf *lpfc_cmd;
870         IOCB_t *cmd, *icmd;
871         unsigned int loop_count = 0;
872         int ret = SUCCESS;
873
874         lpfc_block_error_handler(cmnd);
875         spin_lock_irq(shost->host_lock);
876
877         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
878         BUG_ON(!lpfc_cmd);
879
880         /*
881          * If pCmd field of the corresponding lpfc_scsi_buf structure
882          * points to a different SCSI command, then the driver has
883          * already completed this command, but the midlayer did not
884          * see the completion before the eh fired.  Just return
885          * SUCCESS.
886          */
887         iocb = &lpfc_cmd->cur_iocbq;
888         if (lpfc_cmd->pCmd != cmnd)
889                 goto out;
890
891         BUG_ON(iocb->context1 != lpfc_cmd);
892
893         abtsiocb = lpfc_sli_get_iocbq(phba);
894         if (abtsiocb == NULL) {
895                 ret = FAILED;
896                 goto out;
897         }
898
899         /*
900          * The scsi command can not be in txq and it is in flight because the
901          * pCmd is still pointig at the SCSI command we have to abort. There
902          * is no need to search the txcmplq. Just send an abort to the FW.
903          */
904
905         cmd = &iocb->iocb;
906         icmd = &abtsiocb->iocb;
907         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
908         icmd->un.acxri.abortContextTag = cmd->ulpContext;
909         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
910
911         icmd->ulpLe = 1;
912         icmd->ulpClass = cmd->ulpClass;
913         if (phba->hba_state >= LPFC_LINK_UP)
914                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
915         else
916                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
917
918         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
919         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
920                 lpfc_sli_release_iocbq(phba, abtsiocb);
921                 ret = FAILED;
922                 goto out;
923         }
924
925         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
926                 lpfc_sli_poll_fcp_ring (phba);
927
928         /* Wait for abort to complete */
929         while (lpfc_cmd->pCmd == cmnd)
930         {
931                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
932                         lpfc_sli_poll_fcp_ring (phba);
933
934                 spin_unlock_irq(phba->host->host_lock);
935                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
936                 spin_lock_irq(phba->host->host_lock);
937                 if (++loop_count
938                     > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
939                         break;
940         }
941
942         if (lpfc_cmd->pCmd == cmnd) {
943                 ret = FAILED;
944                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
945                                 "%d:0748 abort handler timed out waiting for "
946                                 "abort to complete: ret %#x, ID %d, LUN %d, "
947                                 "snum %#lx\n",
948                                 phba->brd_no,  ret, cmnd->device->id,
949                                 cmnd->device->lun, cmnd->serial_number);
950         }
951
952  out:
953         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
954                         "%d:0749 SCSI Layer I/O Abort Request "
955                         "Status x%x ID %d LUN %d snum %#lx\n",
956                         phba->brd_no, ret, cmnd->device->id,
957                         cmnd->device->lun, cmnd->serial_number);
958
959         spin_unlock_irq(shost->host_lock);
960
961         return ret;
962 }
963
964 static int
965 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
966 {
967         struct Scsi_Host *shost = cmnd->device->host;
968         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
969         struct lpfc_scsi_buf *lpfc_cmd;
970         struct lpfc_iocbq *iocbq, *iocbqrsp;
971         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
972         struct lpfc_nodelist *pnode = rdata->pnode;
973         uint32_t cmd_result = 0, cmd_status = 0;
974         int ret = FAILED;
975         int cnt, loopcnt;
976
977         lpfc_block_error_handler(cmnd);
978         spin_lock_irq(shost->host_lock);
979         /*
980          * If target is not in a MAPPED state, delay the reset until
981          * target is rediscovered or nodev timeout expires.
982          */
983         while ( 1 ) {
984                 if (!pnode)
985                         break;
986
987                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
988                         spin_unlock_irq(phba->host->host_lock);
989                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
990                         spin_lock_irq(phba->host->host_lock);
991                 }
992                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
993                         break;
994         }
995
996         lpfc_cmd = lpfc_get_scsi_buf (phba);
997         if (lpfc_cmd == NULL)
998                 goto out;
999
1000         lpfc_cmd->timeout = 60;
1001         lpfc_cmd->scsi_hba = phba;
1002         lpfc_cmd->rdata = rdata;
1003
1004         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, cmnd->device->lun,
1005                                            FCP_LUN_RESET);
1006         if (!ret)
1007                 goto out_free_scsi_buf;
1008
1009         iocbq = &lpfc_cmd->cur_iocbq;
1010
1011         /* get a buffer for this IOCB command response */
1012         iocbqrsp = lpfc_sli_get_iocbq(phba);
1013         if (iocbqrsp == NULL)
1014                 goto out_free_scsi_buf;
1015
1016         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
1017                         "%d:0703 Issue LUN Reset to TGT %d LUN %d "
1018                         "Data: x%x x%x\n", phba->brd_no, cmnd->device->id,
1019                         cmnd->device->lun, pnode->nlp_rpi, pnode->nlp_flag);
1020
1021         ret = lpfc_sli_issue_iocb_wait(phba,
1022                                        &phba->sli.ring[phba->sli.fcp_ring],
1023                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
1024         if (ret == IOCB_SUCCESS)
1025                 ret = SUCCESS;
1026
1027
1028         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
1029         cmd_status = iocbqrsp->iocb.ulpStatus;
1030
1031         lpfc_sli_release_iocbq(phba, iocbqrsp);
1032
1033         /*
1034          * All outstanding txcmplq I/Os should have been aborted by the device.
1035          * Unfortunately, some targets do not abide by this forcing the driver
1036          * to double check.
1037          */
1038         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1039                                 cmnd->device->id, cmnd->device->lun,
1040                                 LPFC_CTX_LUN);
1041         if (cnt)
1042                 lpfc_sli_abort_iocb(phba,
1043                                     &phba->sli.ring[phba->sli.fcp_ring],
1044                                     cmnd->device->id, cmnd->device->lun,
1045                                     0, LPFC_CTX_LUN);
1046         loopcnt = 0;
1047         while(cnt) {
1048                 spin_unlock_irq(phba->host->host_lock);
1049                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1050                 spin_lock_irq(phba->host->host_lock);
1051
1052                 if (++loopcnt
1053                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1054                         break;
1055
1056                 cnt = lpfc_sli_sum_iocb(phba,
1057                                         &phba->sli.ring[phba->sli.fcp_ring],
1058                                         cmnd->device->id, cmnd->device->lun,
1059                                         LPFC_CTX_LUN);
1060         }
1061
1062         if (cnt) {
1063                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1064                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
1065                         phba->brd_no, cnt);
1066                 ret = FAILED;
1067         }
1068
1069 out_free_scsi_buf:
1070         lpfc_release_scsi_buf(phba, lpfc_cmd);
1071
1072         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1073                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
1074                         "Data: x%x x%x x%x\n",
1075                         phba->brd_no, cmnd->device->id,cmnd->device->lun,
1076                         ret, cmd_status, cmd_result);
1077
1078 out:
1079         spin_unlock_irq(shost->host_lock);
1080         return ret;
1081 }
1082
1083 static int
1084 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1085 {
1086         struct Scsi_Host *shost = cmnd->device->host;
1087         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
1088         struct lpfc_nodelist *ndlp = NULL;
1089         int match;
1090         int ret = FAILED, i, err_count = 0;
1091         int cnt, loopcnt;
1092         struct lpfc_scsi_buf * lpfc_cmd;
1093
1094         lpfc_block_error_handler(cmnd);
1095         spin_lock_irq(shost->host_lock);
1096
1097         lpfc_cmd = lpfc_get_scsi_buf(phba);
1098         if (lpfc_cmd == NULL)
1099                 goto out;
1100
1101         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1102         lpfc_cmd->timeout = 60;
1103         lpfc_cmd->scsi_hba = phba;
1104
1105         /*
1106          * Since the driver manages a single bus device, reset all
1107          * targets known to the driver.  Should any target reset
1108          * fail, this routine returns failure to the midlayer.
1109          */
1110         for (i = 0; i < LPFC_MAX_TARGET; i++) {
1111                 /* Search the mapped list for this target ID */
1112                 match = 0;
1113                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1114                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1115                                 match = 1;
1116                                 break;
1117                         }
1118                 }
1119                 if (!match)
1120                         continue;
1121
1122                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba, i, cmnd->device->lun,
1123                                           ndlp->rport->dd_data);
1124                 if (ret != SUCCESS) {
1125                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1126                                 "%d:0700 Bus Reset on target %d failed\n",
1127                                 phba->brd_no, i);
1128                         err_count++;
1129                 }
1130         }
1131
1132         if (err_count == 0)
1133                 ret = SUCCESS;
1134
1135         lpfc_release_scsi_buf(phba, lpfc_cmd);
1136
1137         /*
1138          * All outstanding txcmplq I/Os should have been aborted by
1139          * the targets.  Unfortunately, some targets do not abide by
1140          * this forcing the driver to double check.
1141          */
1142         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1143                                 0, 0, LPFC_CTX_HOST);
1144         if (cnt)
1145                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1146                                     0, 0, 0, LPFC_CTX_HOST);
1147         loopcnt = 0;
1148         while(cnt) {
1149                 spin_unlock_irq(phba->host->host_lock);
1150                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1151                 spin_lock_irq(phba->host->host_lock);
1152
1153                 if (++loopcnt
1154                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1155                         break;
1156
1157                 cnt = lpfc_sli_sum_iocb(phba,
1158                                         &phba->sli.ring[phba->sli.fcp_ring],
1159                                         0, 0, LPFC_CTX_HOST);
1160         }
1161
1162         if (cnt) {
1163                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1164                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1165                    phba->brd_no, cnt, i);
1166                 ret = FAILED;
1167         }
1168
1169         lpfc_printf_log(phba,
1170                         KERN_ERR,
1171                         LOG_FCP,
1172                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1173                         phba->brd_no, ret);
1174 out:
1175         spin_unlock_irq(shost->host_lock);
1176         return ret;
1177 }
1178
1179 static int
1180 lpfc_slave_alloc(struct scsi_device *sdev)
1181 {
1182         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata;
1183         struct lpfc_scsi_buf *scsi_buf = NULL;
1184         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1185         uint32_t total = 0, i;
1186         uint32_t num_to_alloc = 0;
1187         unsigned long flags;
1188
1189         if (!rport || fc_remote_port_chkready(rport))
1190                 return -ENXIO;
1191
1192         sdev->hostdata = rport->dd_data;
1193
1194         /*
1195          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1196          * available list of scsi buffers.  Don't allocate more than the
1197          * HBA limit conveyed to the midlayer via the host structure.  The
1198          * formula accounts for the lun_queue_depth + error handlers + 1
1199          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1200          */
1201         total = phba->total_scsi_bufs;
1202         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1203         if (total >= phba->cfg_hba_queue_depth) {
1204                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1205                                 "%d:0704 At limitation of %d preallocated "
1206                                 "command buffers\n", phba->brd_no, total);
1207                 return 0;
1208         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1209                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1210                                 "%d:0705 Allocation request of %d command "
1211                                 "buffers will exceed max of %d.  Reducing "
1212                                 "allocation request to %d.\n", phba->brd_no,
1213                                 num_to_alloc, phba->cfg_hba_queue_depth,
1214                                 (phba->cfg_hba_queue_depth - total));
1215                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1216         }
1217
1218         for (i = 0; i < num_to_alloc; i++) {
1219                 scsi_buf = lpfc_new_scsi_buf(phba);
1220                 if (!scsi_buf) {
1221                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1222                                         "%d:0706 Failed to allocate command "
1223                                         "buffer\n", phba->brd_no);
1224                         break;
1225                 }
1226
1227                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1228                 phba->total_scsi_bufs++;
1229                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1230                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1231         }
1232         return 0;
1233 }
1234
1235 static int
1236 lpfc_slave_configure(struct scsi_device *sdev)
1237 {
1238         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata;
1239         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1240
1241         if (sdev->tagged_supported)
1242                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1243         else
1244                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1245
1246         /*
1247          * Initialize the fc transport attributes for the target
1248          * containing this scsi device.  Also note that the driver's
1249          * target pointer is stored in the starget_data for the
1250          * driver's sysfs entry point functions.
1251          */
1252         rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;
1253
1254         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1255                 lpfc_sli_poll_fcp_ring(phba);
1256                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1257                         lpfc_poll_rearm_timer(phba);
1258         }
1259
1260         return 0;
1261 }
1262
1263 static void
1264 lpfc_slave_destroy(struct scsi_device *sdev)
1265 {
1266         sdev->hostdata = NULL;
1267         return;
1268 }
1269
1270 struct scsi_host_template lpfc_template = {
1271         .module                 = THIS_MODULE,
1272         .name                   = LPFC_DRIVER_NAME,
1273         .info                   = lpfc_info,
1274         .queuecommand           = lpfc_queuecommand,
1275         .eh_abort_handler       = lpfc_abort_handler,
1276         .eh_device_reset_handler= lpfc_reset_lun_handler,
1277         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1278         .slave_alloc            = lpfc_slave_alloc,
1279         .slave_configure        = lpfc_slave_configure,
1280         .slave_destroy          = lpfc_slave_destroy,
1281         .this_id                = -1,
1282         .sg_tablesize           = LPFC_SG_SEG_CNT,
1283         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1284         .use_clustering         = ENABLE_CLUSTERING,
1285         .shost_attrs            = lpfc_host_attrs,
1286         .max_sectors            = 0xFFFF,
1287 };