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