1 /*
2 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
4 *
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16 * SOFTWARE.
17 */
18 #include <linux/mempool.h>
19 #include <linux/errno.h>
20 #include <linux/init.h>
21 #include <linux/workqueue.h>
22 #include <linux/pci.h>
23 #include <linux/scatterlist.h>
24 #include <linux/skbuff.h>
25 #include <linux/spinlock.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/delay.h>
29 #include <linux/gfp.h>
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_cmnd.h>
34 #include <scsi/scsi_tcq.h>
35 #include <scsi/fc/fc_els.h>
36 #include <scsi/fc/fc_fcoe.h>
37 #include <scsi/libfc.h>
38 #include <scsi/fc_frame.h>
39 #include "fnic_io.h"
40 #include "fnic.h"
41
42 const char *fnic_state_str[] = {
43 [FNIC_IN_FC_MODE] = "FNIC_IN_FC_MODE",
44 [FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE",
45 [FNIC_IN_ETH_MODE] = "FNIC_IN_ETH_MODE",
46 [FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE",
47 };
48
49 static const char *fnic_ioreq_state_str[] = {
50 [FNIC_IOREQ_NOT_INITED] = "FNIC_IOREQ_NOT_INITED",
51 [FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING",
52 [FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING",
53 [FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE",
54 [FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE",
55 };
56
57 static const char *fcpio_status_str[] = {
58 [FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/
59 [FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER",
60 [FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE",
61 [FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]",
62 [FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED",
63 [FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND",
64 [FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/
65 [FCPIO_TIMEOUT] = "FCPIO_TIMEOUT",
66 [FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID",
67 [FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID",
68 [FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH",
69 [FCPIO_FW_ERR] = "FCPIO_FW_ERR",
70 [FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED",
71 [FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED",
72 [FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN",
73 [FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED",
74 [FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL",
75 [FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED",
76 [FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND",
77 };
78
fnic_state_to_str(unsigned int state)79 const char *fnic_state_to_str(unsigned int state)
80 {
81 if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state])
82 return "unknown";
83
84 return fnic_state_str[state];
85 }
86
fnic_ioreq_state_to_str(unsigned int state)87 static const char *fnic_ioreq_state_to_str(unsigned int state)
88 {
89 if (state >= ARRAY_SIZE(fnic_ioreq_state_str) ||
90 !fnic_ioreq_state_str[state])
91 return "unknown";
92
93 return fnic_ioreq_state_str[state];
94 }
95
fnic_fcpio_status_to_str(unsigned int status)96 static const char *fnic_fcpio_status_to_str(unsigned int status)
97 {
98 if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status])
99 return "unknown";
100
101 return fcpio_status_str[status];
102 }
103
104 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id);
105
fnic_io_lock_hash(struct fnic * fnic,struct scsi_cmnd * sc)106 static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
107 struct scsi_cmnd *sc)
108 {
109 u32 hash = sc->request->tag & (FNIC_IO_LOCKS - 1);
110
111 return &fnic->io_req_lock[hash];
112 }
113
fnic_io_lock_tag(struct fnic * fnic,int tag)114 static inline spinlock_t *fnic_io_lock_tag(struct fnic *fnic,
115 int tag)
116 {
117 return &fnic->io_req_lock[tag & (FNIC_IO_LOCKS - 1)];
118 }
119
120 /*
121 * Unmap the data buffer and sense buffer for an io_req,
122 * also unmap and free the device-private scatter/gather list.
123 */
fnic_release_ioreq_buf(struct fnic * fnic,struct fnic_io_req * io_req,struct scsi_cmnd * sc)124 static void fnic_release_ioreq_buf(struct fnic *fnic,
125 struct fnic_io_req *io_req,
126 struct scsi_cmnd *sc)
127 {
128 if (io_req->sgl_list_pa)
129 pci_unmap_single(fnic->pdev, io_req->sgl_list_pa,
130 sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
131 PCI_DMA_TODEVICE);
132 scsi_dma_unmap(sc);
133
134 if (io_req->sgl_cnt)
135 mempool_free(io_req->sgl_list_alloc,
136 fnic->io_sgl_pool[io_req->sgl_type]);
137 if (io_req->sense_buf_pa)
138 pci_unmap_single(fnic->pdev, io_req->sense_buf_pa,
139 SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
140 }
141
142 /* Free up Copy Wq descriptors. Called with copy_wq lock held */
free_wq_copy_descs(struct fnic * fnic,struct vnic_wq_copy * wq)143 static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
144 {
145 /* if no Ack received from firmware, then nothing to clean */
146 if (!fnic->fw_ack_recd[0])
147 return 1;
148
149 /*
150 * Update desc_available count based on number of freed descriptors
151 * Account for wraparound
152 */
153 if (wq->to_clean_index <= fnic->fw_ack_index[0])
154 wq->ring.desc_avail += (fnic->fw_ack_index[0]
155 - wq->to_clean_index + 1);
156 else
157 wq->ring.desc_avail += (wq->ring.desc_count
158 - wq->to_clean_index
159 + fnic->fw_ack_index[0] + 1);
160
161 /*
162 * just bump clean index to ack_index+1 accounting for wraparound
163 * this will essentially free up all descriptors between
164 * to_clean_index and fw_ack_index, both inclusive
165 */
166 wq->to_clean_index =
167 (fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;
168
169 /* we have processed the acks received so far */
170 fnic->fw_ack_recd[0] = 0;
171 return 0;
172 }
173
174
175 /**
176 * __fnic_set_state_flags
177 * Sets/Clears bits in fnic's state_flags
178 **/
179 void
__fnic_set_state_flags(struct fnic * fnic,unsigned long st_flags,unsigned long clearbits)180 __fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags,
181 unsigned long clearbits)
182 {
183 struct Scsi_Host *host = fnic->lport->host;
184 int sh_locked = spin_is_locked(host->host_lock);
185 unsigned long flags = 0;
186
187 if (!sh_locked)
188 spin_lock_irqsave(host->host_lock, flags);
189
190 if (clearbits)
191 fnic->state_flags &= ~st_flags;
192 else
193 fnic->state_flags |= st_flags;
194
195 if (!sh_locked)
196 spin_unlock_irqrestore(host->host_lock, flags);
197
198 return;
199 }
200
201
202 /*
203 * fnic_fw_reset_handler
204 * Routine to send reset msg to fw
205 */
fnic_fw_reset_handler(struct fnic * fnic)206 int fnic_fw_reset_handler(struct fnic *fnic)
207 {
208 struct vnic_wq_copy *wq = &fnic->wq_copy[0];
209 int ret = 0;
210 unsigned long flags;
211
212 /* indicate fwreset to io path */
213 fnic_set_state_flags(fnic, FNIC_FLAGS_FWRESET);
214
215 skb_queue_purge(&fnic->frame_queue);
216 skb_queue_purge(&fnic->tx_queue);
217
218 /* wait for io cmpl */
219 while (atomic_read(&fnic->in_flight))
220 schedule_timeout(msecs_to_jiffies(1));
221
222 spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
223
224 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
225 free_wq_copy_descs(fnic, wq);
226
227 if (!vnic_wq_copy_desc_avail(wq))
228 ret = -EAGAIN;
229 else {
230 fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG);
231 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
232 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
233 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
234 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
235 atomic64_read(
236 &fnic->fnic_stats.fw_stats.active_fw_reqs));
237 }
238
239 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
240
241 if (!ret) {
242 atomic64_inc(&fnic->fnic_stats.reset_stats.fw_resets);
243 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
244 "Issued fw reset\n");
245 } else {
246 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
247 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
248 "Failed to issue fw reset\n");
249 }
250
251 return ret;
252 }
253
254
255 /*
256 * fnic_flogi_reg_handler
257 * Routine to send flogi register msg to fw
258 */
fnic_flogi_reg_handler(struct fnic * fnic,u32 fc_id)259 int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id)
260 {
261 struct vnic_wq_copy *wq = &fnic->wq_copy[0];
262 enum fcpio_flogi_reg_format_type format;
263 struct fc_lport *lp = fnic->lport;
264 u8 gw_mac[ETH_ALEN];
265 int ret = 0;
266 unsigned long flags;
267
268 spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
269
270 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
271 free_wq_copy_descs(fnic, wq);
272
273 if (!vnic_wq_copy_desc_avail(wq)) {
274 ret = -EAGAIN;
275 goto flogi_reg_ioreq_end;
276 }
277
278 if (fnic->ctlr.map_dest) {
279 memset(gw_mac, 0xff, ETH_ALEN);
280 format = FCPIO_FLOGI_REG_DEF_DEST;
281 } else {
282 memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN);
283 format = FCPIO_FLOGI_REG_GW_DEST;
284 }
285
286 if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) {
287 fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG,
288 fc_id, gw_mac,
289 fnic->data_src_addr,
290 lp->r_a_tov, lp->e_d_tov);
291 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
292 "FLOGI FIP reg issued fcid %x src %pM dest %pM\n",
293 fc_id, fnic->data_src_addr, gw_mac);
294 } else {
295 fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG,
296 format, fc_id, gw_mac);
297 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
298 "FLOGI reg issued fcid %x map %d dest %pM\n",
299 fc_id, fnic->ctlr.map_dest, gw_mac);
300 }
301
302 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
303 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
304 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
305 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
306 atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
307
308 flogi_reg_ioreq_end:
309 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
310 return ret;
311 }
312
313 /*
314 * fnic_queue_wq_copy_desc
315 * Routine to enqueue a wq copy desc
316 */
fnic_queue_wq_copy_desc(struct fnic * fnic,struct vnic_wq_copy * wq,struct fnic_io_req * io_req,struct scsi_cmnd * sc,int sg_count)317 static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
318 struct vnic_wq_copy *wq,
319 struct fnic_io_req *io_req,
320 struct scsi_cmnd *sc,
321 int sg_count)
322 {
323 struct scatterlist *sg;
324 struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
325 struct fc_rport_libfc_priv *rp = rport->dd_data;
326 struct host_sg_desc *desc;
327 struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
328 unsigned int i;
329 unsigned long intr_flags;
330 int flags;
331 u8 exch_flags;
332 struct scsi_lun fc_lun;
333 int r;
334
335 if (sg_count) {
336 /* For each SGE, create a device desc entry */
337 desc = io_req->sgl_list;
338 for_each_sg(scsi_sglist(sc), sg, sg_count, i) {
339 desc->addr = cpu_to_le64(sg_dma_address(sg));
340 desc->len = cpu_to_le32(sg_dma_len(sg));
341 desc->_resvd = 0;
342 desc++;
343 }
344
345 io_req->sgl_list_pa = pci_map_single
346 (fnic->pdev,
347 io_req->sgl_list,
348 sizeof(io_req->sgl_list[0]) * sg_count,
349 PCI_DMA_TODEVICE);
350
351 r = pci_dma_mapping_error(fnic->pdev, io_req->sgl_list_pa);
352 if (r) {
353 printk(KERN_ERR "PCI mapping failed with error %d\n", r);
354 return SCSI_MLQUEUE_HOST_BUSY;
355 }
356 }
357
358 io_req->sense_buf_pa = pci_map_single(fnic->pdev,
359 sc->sense_buffer,
360 SCSI_SENSE_BUFFERSIZE,
361 PCI_DMA_FROMDEVICE);
362
363 r = pci_dma_mapping_error(fnic->pdev, io_req->sense_buf_pa);
364 if (r) {
365 pci_unmap_single(fnic->pdev, io_req->sgl_list_pa,
366 sizeof(io_req->sgl_list[0]) * sg_count,
367 PCI_DMA_TODEVICE);
368 printk(KERN_ERR "PCI mapping failed with error %d\n", r);
369 return SCSI_MLQUEUE_HOST_BUSY;
370 }
371
372 int_to_scsilun(sc->device->lun, &fc_lun);
373
374 /* Enqueue the descriptor in the Copy WQ */
375 spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
376
377 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
378 free_wq_copy_descs(fnic, wq);
379
380 if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
381 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
382 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
383 "fnic_queue_wq_copy_desc failure - no descriptors\n");
384 atomic64_inc(&misc_stats->io_cpwq_alloc_failures);
385 return SCSI_MLQUEUE_HOST_BUSY;
386 }
387
388 flags = 0;
389 if (sc->sc_data_direction == DMA_FROM_DEVICE)
390 flags = FCPIO_ICMND_RDDATA;
391 else if (sc->sc_data_direction == DMA_TO_DEVICE)
392 flags = FCPIO_ICMND_WRDATA;
393
394 exch_flags = 0;
395 if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
396 (rp->flags & FC_RP_FLAGS_RETRY))
397 exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;
398
399 fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag,
400 0, exch_flags, io_req->sgl_cnt,
401 SCSI_SENSE_BUFFERSIZE,
402 io_req->sgl_list_pa,
403 io_req->sense_buf_pa,
404 0, /* scsi cmd ref, always 0 */
405 FCPIO_ICMND_PTA_SIMPLE,
406 /* scsi pri and tag */
407 flags, /* command flags */
408 sc->cmnd, sc->cmd_len,
409 scsi_bufflen(sc),
410 fc_lun.scsi_lun, io_req->port_id,
411 rport->maxframe_size, rp->r_a_tov,
412 rp->e_d_tov);
413
414 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
415 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
416 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
417 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
418 atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
419
420 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
421 return 0;
422 }
423
424 /*
425 * fnic_queuecommand
426 * Routine to send a scsi cdb
427 * Called with host_lock held and interrupts disabled.
428 */
fnic_queuecommand_lck(struct scsi_cmnd * sc,void (* done)(struct scsi_cmnd *))429 static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
430 {
431 struct fc_lport *lp = shost_priv(sc->device->host);
432 struct fc_rport *rport;
433 struct fnic_io_req *io_req = NULL;
434 struct fnic *fnic = lport_priv(lp);
435 struct fnic_stats *fnic_stats = &fnic->fnic_stats;
436 struct vnic_wq_copy *wq;
437 int ret;
438 u64 cmd_trace;
439 int sg_count = 0;
440 unsigned long flags = 0;
441 unsigned long ptr;
442 spinlock_t *io_lock = NULL;
443 int io_lock_acquired = 0;
444
445 if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
446 return SCSI_MLQUEUE_HOST_BUSY;
447
448 rport = starget_to_rport(scsi_target(sc->device));
449 ret = fc_remote_port_chkready(rport);
450 if (ret) {
451 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
452 sc->result = ret;
453 done(sc);
454 return 0;
455 }
456
457 if (rport) {
458 struct fc_rport_libfc_priv *rp = rport->dd_data;
459
460 if (!rp || rp->rp_state != RPORT_ST_READY) {
461 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
462 "returning DID_NO_CONNECT for IO as rport is removed\n");
463 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
464 sc->result = DID_NO_CONNECT<<16;
465 done(sc);
466 return 0;
467 }
468 }
469
470 if (lp->state != LPORT_ST_READY || !(lp->link_up))
471 return SCSI_MLQUEUE_HOST_BUSY;
472
473 atomic_inc(&fnic->in_flight);
474
475 /*
476 * Release host lock, use driver resource specific locks from here.
477 * Don't re-enable interrupts in case they were disabled prior to the
478 * caller disabling them.
479 */
480 spin_unlock(lp->host->host_lock);
481 CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
482 CMD_FLAGS(sc) = FNIC_NO_FLAGS;
483
484 /* Get a new io_req for this SCSI IO */
485 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
486 if (!io_req) {
487 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
488 ret = SCSI_MLQUEUE_HOST_BUSY;
489 goto out;
490 }
491 memset(io_req, 0, sizeof(*io_req));
492
493 /* Map the data buffer */
494 sg_count = scsi_dma_map(sc);
495 if (sg_count < 0) {
496 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
497 sc->request->tag, sc, 0, sc->cmnd[0],
498 sg_count, CMD_STATE(sc));
499 mempool_free(io_req, fnic->io_req_pool);
500 goto out;
501 }
502
503 /* Determine the type of scatter/gather list we need */
504 io_req->sgl_cnt = sg_count;
505 io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
506 if (sg_count > FNIC_DFLT_SG_DESC_CNT)
507 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
508
509 if (sg_count) {
510 io_req->sgl_list =
511 mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
512 GFP_ATOMIC);
513 if (!io_req->sgl_list) {
514 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
515 ret = SCSI_MLQUEUE_HOST_BUSY;
516 scsi_dma_unmap(sc);
517 mempool_free(io_req, fnic->io_req_pool);
518 goto out;
519 }
520
521 /* Cache sgl list allocated address before alignment */
522 io_req->sgl_list_alloc = io_req->sgl_list;
523 ptr = (unsigned long) io_req->sgl_list;
524 if (ptr % FNIC_SG_DESC_ALIGN) {
525 io_req->sgl_list = (struct host_sg_desc *)
526 (((unsigned long) ptr
527 + FNIC_SG_DESC_ALIGN - 1)
528 & ~(FNIC_SG_DESC_ALIGN - 1));
529 }
530 }
531
532 /*
533 * Will acquire lock defore setting to IO initialized.
534 */
535
536 io_lock = fnic_io_lock_hash(fnic, sc);
537 spin_lock_irqsave(io_lock, flags);
538
539 /* initialize rest of io_req */
540 io_lock_acquired = 1;
541 io_req->port_id = rport->port_id;
542 io_req->start_time = jiffies;
543 CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
544 CMD_SP(sc) = (char *)io_req;
545 CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
546 sc->scsi_done = done;
547
548 /* create copy wq desc and enqueue it */
549 wq = &fnic->wq_copy[0];
550 ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
551 if (ret) {
552 /*
553 * In case another thread cancelled the request,
554 * refetch the pointer under the lock.
555 */
556 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
557 sc->request->tag, sc, 0, 0, 0,
558 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
559 io_req = (struct fnic_io_req *)CMD_SP(sc);
560 CMD_SP(sc) = NULL;
561 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
562 spin_unlock_irqrestore(io_lock, flags);
563 if (io_req) {
564 fnic_release_ioreq_buf(fnic, io_req, sc);
565 mempool_free(io_req, fnic->io_req_pool);
566 }
567 atomic_dec(&fnic->in_flight);
568 /* acquire host lock before returning to SCSI */
569 spin_lock(lp->host->host_lock);
570 return ret;
571 } else {
572 atomic64_inc(&fnic_stats->io_stats.active_ios);
573 atomic64_inc(&fnic_stats->io_stats.num_ios);
574 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
575 atomic64_read(&fnic_stats->io_stats.max_active_ios))
576 atomic64_set(&fnic_stats->io_stats.max_active_ios,
577 atomic64_read(&fnic_stats->io_stats.active_ios));
578
579 /* REVISIT: Use per IO lock in the final code */
580 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
581 }
582 out:
583 cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
584 (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
585 (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
586 sc->cmnd[5]);
587
588 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
589 sc->request->tag, sc, io_req,
590 sg_count, cmd_trace,
591 (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
592
593 /* if only we issued IO, will we have the io lock */
594 if (io_lock_acquired)
595 spin_unlock_irqrestore(io_lock, flags);
596
597 atomic_dec(&fnic->in_flight);
598 /* acquire host lock before returning to SCSI */
599 spin_lock(lp->host->host_lock);
600 return ret;
601 }
602
DEF_SCSI_QCMD(fnic_queuecommand)603 DEF_SCSI_QCMD(fnic_queuecommand)
604
605 /*
606 * fnic_fcpio_fw_reset_cmpl_handler
607 * Routine to handle fw reset completion
608 */
609 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
610 struct fcpio_fw_req *desc)
611 {
612 u8 type;
613 u8 hdr_status;
614 struct fcpio_tag tag;
615 int ret = 0;
616 unsigned long flags;
617 struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
618
619 fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
620
621 atomic64_inc(&reset_stats->fw_reset_completions);
622
623 /* Clean up all outstanding io requests */
624 fnic_cleanup_io(fnic, SCSI_NO_TAG);
625
626 atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
627 atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
628
629 spin_lock_irqsave(&fnic->fnic_lock, flags);
630
631 /* fnic should be in FC_TRANS_ETH_MODE */
632 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
633 /* Check status of reset completion */
634 if (!hdr_status) {
635 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
636 "reset cmpl success\n");
637 /* Ready to send flogi out */
638 fnic->state = FNIC_IN_ETH_MODE;
639 } else {
640 FNIC_SCSI_DBG(KERN_DEBUG,
641 fnic->lport->host,
642 "fnic fw_reset : failed %s\n",
643 fnic_fcpio_status_to_str(hdr_status));
644
645 /*
646 * Unable to change to eth mode, cannot send out flogi
647 * Change state to fc mode, so that subsequent Flogi
648 * requests from libFC will cause more attempts to
649 * reset the firmware. Free the cached flogi
650 */
651 fnic->state = FNIC_IN_FC_MODE;
652 atomic64_inc(&reset_stats->fw_reset_failures);
653 ret = -1;
654 }
655 } else {
656 FNIC_SCSI_DBG(KERN_DEBUG,
657 fnic->lport->host,
658 "Unexpected state %s while processing"
659 " reset cmpl\n", fnic_state_to_str(fnic->state));
660 atomic64_inc(&reset_stats->fw_reset_failures);
661 ret = -1;
662 }
663
664 /* Thread removing device blocks till firmware reset is complete */
665 if (fnic->remove_wait)
666 complete(fnic->remove_wait);
667
668 /*
669 * If fnic is being removed, or fw reset failed
670 * free the flogi frame. Else, send it out
671 */
672 if (fnic->remove_wait || ret) {
673 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
674 skb_queue_purge(&fnic->tx_queue);
675 goto reset_cmpl_handler_end;
676 }
677
678 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
679
680 fnic_flush_tx(fnic);
681
682 reset_cmpl_handler_end:
683 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
684
685 return ret;
686 }
687
688 /*
689 * fnic_fcpio_flogi_reg_cmpl_handler
690 * Routine to handle flogi register completion
691 */
fnic_fcpio_flogi_reg_cmpl_handler(struct fnic * fnic,struct fcpio_fw_req * desc)692 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
693 struct fcpio_fw_req *desc)
694 {
695 u8 type;
696 u8 hdr_status;
697 struct fcpio_tag tag;
698 int ret = 0;
699 unsigned long flags;
700
701 fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
702
703 /* Update fnic state based on status of flogi reg completion */
704 spin_lock_irqsave(&fnic->fnic_lock, flags);
705
706 if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
707
708 /* Check flogi registration completion status */
709 if (!hdr_status) {
710 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
711 "flog reg succeeded\n");
712 fnic->state = FNIC_IN_FC_MODE;
713 } else {
714 FNIC_SCSI_DBG(KERN_DEBUG,
715 fnic->lport->host,
716 "fnic flogi reg :failed %s\n",
717 fnic_fcpio_status_to_str(hdr_status));
718 fnic->state = FNIC_IN_ETH_MODE;
719 ret = -1;
720 }
721 } else {
722 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
723 "Unexpected fnic state %s while"
724 " processing flogi reg completion\n",
725 fnic_state_to_str(fnic->state));
726 ret = -1;
727 }
728
729 if (!ret) {
730 if (fnic->stop_rx_link_events) {
731 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
732 goto reg_cmpl_handler_end;
733 }
734 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
735
736 fnic_flush_tx(fnic);
737 queue_work(fnic_event_queue, &fnic->frame_work);
738 } else {
739 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
740 }
741
742 reg_cmpl_handler_end:
743 return ret;
744 }
745
is_ack_index_in_range(struct vnic_wq_copy * wq,u16 request_out)746 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
747 u16 request_out)
748 {
749 if (wq->to_clean_index <= wq->to_use_index) {
750 /* out of range, stale request_out index */
751 if (request_out < wq->to_clean_index ||
752 request_out >= wq->to_use_index)
753 return 0;
754 } else {
755 /* out of range, stale request_out index */
756 if (request_out < wq->to_clean_index &&
757 request_out >= wq->to_use_index)
758 return 0;
759 }
760 /* request_out index is in range */
761 return 1;
762 }
763
764
765 /*
766 * Mark that ack received and store the Ack index. If there are multiple
767 * acks received before Tx thread cleans it up, the latest value will be
768 * used which is correct behavior. This state should be in the copy Wq
769 * instead of in the fnic
770 */
fnic_fcpio_ack_handler(struct fnic * fnic,unsigned int cq_index,struct fcpio_fw_req * desc)771 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
772 unsigned int cq_index,
773 struct fcpio_fw_req *desc)
774 {
775 struct vnic_wq_copy *wq;
776 u16 request_out = desc->u.ack.request_out;
777 unsigned long flags;
778 u64 *ox_id_tag = (u64 *)(void *)desc;
779
780 /* mark the ack state */
781 wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
782 spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
783
784 fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
785 if (is_ack_index_in_range(wq, request_out)) {
786 fnic->fw_ack_index[0] = request_out;
787 fnic->fw_ack_recd[0] = 1;
788 } else
789 atomic64_inc(
790 &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
791
792 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
793 FNIC_TRACE(fnic_fcpio_ack_handler,
794 fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
795 ox_id_tag[4], ox_id_tag[5]);
796 }
797
798 /*
799 * fnic_fcpio_icmnd_cmpl_handler
800 * Routine to handle icmnd completions
801 */
fnic_fcpio_icmnd_cmpl_handler(struct fnic * fnic,struct fcpio_fw_req * desc)802 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
803 struct fcpio_fw_req *desc)
804 {
805 u8 type;
806 u8 hdr_status;
807 struct fcpio_tag tag;
808 u32 id;
809 u64 xfer_len = 0;
810 struct fcpio_icmnd_cmpl *icmnd_cmpl;
811 struct fnic_io_req *io_req;
812 struct scsi_cmnd *sc;
813 struct fnic_stats *fnic_stats = &fnic->fnic_stats;
814 unsigned long flags;
815 spinlock_t *io_lock;
816 u64 cmd_trace;
817 unsigned long start_time;
818
819 /* Decode the cmpl description to get the io_req id */
820 fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
821 fcpio_tag_id_dec(&tag, &id);
822 icmnd_cmpl = &desc->u.icmnd_cmpl;
823
824 if (id >= fnic->fnic_max_tag_id) {
825 shost_printk(KERN_ERR, fnic->lport->host,
826 "Tag out of range tag %x hdr status = %s\n",
827 id, fnic_fcpio_status_to_str(hdr_status));
828 return;
829 }
830
831 sc = scsi_host_find_tag(fnic->lport->host, id);
832 WARN_ON_ONCE(!sc);
833 if (!sc) {
834 atomic64_inc(&fnic_stats->io_stats.sc_null);
835 shost_printk(KERN_ERR, fnic->lport->host,
836 "icmnd_cmpl sc is null - "
837 "hdr status = %s tag = 0x%x desc = 0x%p\n",
838 fnic_fcpio_status_to_str(hdr_status), id, desc);
839 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
840 fnic->lport->host->host_no, id,
841 ((u64)icmnd_cmpl->_resvd0[1] << 16 |
842 (u64)icmnd_cmpl->_resvd0[0]),
843 ((u64)hdr_status << 16 |
844 (u64)icmnd_cmpl->scsi_status << 8 |
845 (u64)icmnd_cmpl->flags), desc,
846 (u64)icmnd_cmpl->residual, 0);
847 return;
848 }
849
850 io_lock = fnic_io_lock_hash(fnic, sc);
851 spin_lock_irqsave(io_lock, flags);
852 io_req = (struct fnic_io_req *)CMD_SP(sc);
853 WARN_ON_ONCE(!io_req);
854 if (!io_req) {
855 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
856 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
857 spin_unlock_irqrestore(io_lock, flags);
858 shost_printk(KERN_ERR, fnic->lport->host,
859 "icmnd_cmpl io_req is null - "
860 "hdr status = %s tag = 0x%x sc 0x%p\n",
861 fnic_fcpio_status_to_str(hdr_status), id, sc);
862 return;
863 }
864 start_time = io_req->start_time;
865
866 /* firmware completed the io */
867 io_req->io_completed = 1;
868
869 /*
870 * if SCSI-ML has already issued abort on this command,
871 * ignore completion of the IO. The abts path will clean it up
872 */
873 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
874 spin_unlock_irqrestore(io_lock, flags);
875 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
876 switch (hdr_status) {
877 case FCPIO_SUCCESS:
878 CMD_FLAGS(sc) |= FNIC_IO_DONE;
879 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
880 "icmnd_cmpl ABTS pending hdr status = %s "
881 "sc 0x%p scsi_status %x residual %d\n",
882 fnic_fcpio_status_to_str(hdr_status), sc,
883 icmnd_cmpl->scsi_status,
884 icmnd_cmpl->residual);
885 break;
886 case FCPIO_ABORTED:
887 CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
888 break;
889 default:
890 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
891 "icmnd_cmpl abts pending "
892 "hdr status = %s tag = 0x%x sc = 0x%p\n",
893 fnic_fcpio_status_to_str(hdr_status),
894 id, sc);
895 break;
896 }
897 return;
898 }
899
900 /* Mark the IO as complete */
901 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
902
903 icmnd_cmpl = &desc->u.icmnd_cmpl;
904
905 switch (hdr_status) {
906 case FCPIO_SUCCESS:
907 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
908 xfer_len = scsi_bufflen(sc);
909 scsi_set_resid(sc, icmnd_cmpl->residual);
910
911 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
912 xfer_len -= icmnd_cmpl->residual;
913
914 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
915 atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
916 break;
917
918 case FCPIO_TIMEOUT: /* request was timed out */
919 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
920 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
921 break;
922
923 case FCPIO_ABORTED: /* request was aborted */
924 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
925 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
926 break;
927
928 case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
929 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
930 scsi_set_resid(sc, icmnd_cmpl->residual);
931 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
932 break;
933
934 case FCPIO_OUT_OF_RESOURCE: /* out of resources to complete request */
935 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
936 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
937 break;
938
939 case FCPIO_IO_NOT_FOUND: /* requested I/O was not found */
940 atomic64_inc(&fnic_stats->io_stats.io_not_found);
941 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
942 break;
943
944 case FCPIO_SGL_INVALID: /* request was aborted due to sgl error */
945 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
946 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
947 break;
948
949 case FCPIO_FW_ERR: /* request was terminated due fw error */
950 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
951 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
952 break;
953
954 case FCPIO_MSS_INVALID: /* request was aborted due to mss error */
955 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
956 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
957 break;
958
959 case FCPIO_INVALID_HEADER: /* header contains invalid data */
960 case FCPIO_INVALID_PARAM: /* some parameter in request invalid */
961 case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
962 default:
963 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
964 break;
965 }
966
967 /* Break link with the SCSI command */
968 CMD_SP(sc) = NULL;
969 CMD_FLAGS(sc) |= FNIC_IO_DONE;
970
971 spin_unlock_irqrestore(io_lock, flags);
972
973 if (hdr_status != FCPIO_SUCCESS) {
974 atomic64_inc(&fnic_stats->io_stats.io_failures);
975 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
976 fnic_fcpio_status_to_str(hdr_status));
977 }
978
979 fnic_release_ioreq_buf(fnic, io_req, sc);
980
981 mempool_free(io_req, fnic->io_req_pool);
982
983 cmd_trace = ((u64)hdr_status << 56) |
984 (u64)icmnd_cmpl->scsi_status << 48 |
985 (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
986 (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
987 (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
988
989 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
990 sc->device->host->host_no, id, sc,
991 ((u64)icmnd_cmpl->_resvd0[1] << 56 |
992 (u64)icmnd_cmpl->_resvd0[0] << 48 |
993 jiffies_to_msecs(jiffies - start_time)),
994 desc, cmd_trace,
995 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
996
997 if (sc->sc_data_direction == DMA_FROM_DEVICE) {
998 fnic->lport->host_stats.fcp_input_requests++;
999 fnic->fcp_input_bytes += xfer_len;
1000 } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1001 fnic->lport->host_stats.fcp_output_requests++;
1002 fnic->fcp_output_bytes += xfer_len;
1003 } else
1004 fnic->lport->host_stats.fcp_control_requests++;
1005
1006 atomic64_dec(&fnic_stats->io_stats.active_ios);
1007 if (atomic64_read(&fnic->io_cmpl_skip))
1008 atomic64_dec(&fnic->io_cmpl_skip);
1009 else
1010 atomic64_inc(&fnic_stats->io_stats.io_completions);
1011
1012 /* Call SCSI completion function to complete the IO */
1013 if (sc->scsi_done)
1014 sc->scsi_done(sc);
1015 }
1016
1017 /* fnic_fcpio_itmf_cmpl_handler
1018 * Routine to handle itmf completions
1019 */
fnic_fcpio_itmf_cmpl_handler(struct fnic * fnic,struct fcpio_fw_req * desc)1020 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1021 struct fcpio_fw_req *desc)
1022 {
1023 u8 type;
1024 u8 hdr_status;
1025 struct fcpio_tag tag;
1026 u32 id;
1027 struct scsi_cmnd *sc;
1028 struct fnic_io_req *io_req;
1029 struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1030 struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1031 struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1032 struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1033 unsigned long flags;
1034 spinlock_t *io_lock;
1035 unsigned long start_time;
1036
1037 fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1038 fcpio_tag_id_dec(&tag, &id);
1039
1040 if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1041 shost_printk(KERN_ERR, fnic->lport->host,
1042 "Tag out of range tag %x hdr status = %s\n",
1043 id, fnic_fcpio_status_to_str(hdr_status));
1044 return;
1045 }
1046
1047 sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1048 WARN_ON_ONCE(!sc);
1049 if (!sc) {
1050 atomic64_inc(&fnic_stats->io_stats.sc_null);
1051 shost_printk(KERN_ERR, fnic->lport->host,
1052 "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1053 fnic_fcpio_status_to_str(hdr_status), id);
1054 return;
1055 }
1056 io_lock = fnic_io_lock_hash(fnic, sc);
1057 spin_lock_irqsave(io_lock, flags);
1058 io_req = (struct fnic_io_req *)CMD_SP(sc);
1059 WARN_ON_ONCE(!io_req);
1060 if (!io_req) {
1061 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1062 spin_unlock_irqrestore(io_lock, flags);
1063 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1064 shost_printk(KERN_ERR, fnic->lport->host,
1065 "itmf_cmpl io_req is null - "
1066 "hdr status = %s tag = 0x%x sc 0x%p\n",
1067 fnic_fcpio_status_to_str(hdr_status), id, sc);
1068 return;
1069 }
1070 start_time = io_req->start_time;
1071
1072 if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1073 /* Abort and terminate completion of device reset req */
1074 /* REVISIT : Add asserts about various flags */
1075 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1076 "dev reset abts cmpl recd. id %x status %s\n",
1077 id, fnic_fcpio_status_to_str(hdr_status));
1078 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1079 CMD_ABTS_STATUS(sc) = hdr_status;
1080 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1081 if (io_req->abts_done)
1082 complete(io_req->abts_done);
1083 spin_unlock_irqrestore(io_lock, flags);
1084 } else if (id & FNIC_TAG_ABORT) {
1085 /* Completion of abort cmd */
1086 switch (hdr_status) {
1087 case FCPIO_SUCCESS:
1088 break;
1089 case FCPIO_TIMEOUT:
1090 if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1091 atomic64_inc(&abts_stats->abort_fw_timeouts);
1092 else
1093 atomic64_inc(
1094 &term_stats->terminate_fw_timeouts);
1095 break;
1096 case FCPIO_ITMF_REJECTED:
1097 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1098 "abort reject recd. id %d\n",
1099 (int)(id & FNIC_TAG_MASK));
1100 break;
1101 case FCPIO_IO_NOT_FOUND:
1102 if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1103 atomic64_inc(&abts_stats->abort_io_not_found);
1104 else
1105 atomic64_inc(
1106 &term_stats->terminate_io_not_found);
1107 break;
1108 default:
1109 if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1110 atomic64_inc(&abts_stats->abort_failures);
1111 else
1112 atomic64_inc(
1113 &term_stats->terminate_failures);
1114 break;
1115 }
1116 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1117 /* This is a late completion. Ignore it */
1118 spin_unlock_irqrestore(io_lock, flags);
1119 return;
1120 }
1121
1122 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1123
1124 /* If the status is IO not found consider it as success */
1125 if (hdr_status == FCPIO_IO_NOT_FOUND)
1126 CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1127 else
1128 CMD_ABTS_STATUS(sc) = hdr_status;
1129
1130 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1131 atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1132
1133 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1134 "abts cmpl recd. id %d status %s\n",
1135 (int)(id & FNIC_TAG_MASK),
1136 fnic_fcpio_status_to_str(hdr_status));
1137
1138 /*
1139 * If scsi_eh thread is blocked waiting for abts to complete,
1140 * signal completion to it. IO will be cleaned in the thread
1141 * else clean it in this context
1142 */
1143 if (io_req->abts_done) {
1144 complete(io_req->abts_done);
1145 spin_unlock_irqrestore(io_lock, flags);
1146 } else {
1147 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1148 "abts cmpl, completing IO\n");
1149 CMD_SP(sc) = NULL;
1150 sc->result = (DID_ERROR << 16);
1151
1152 spin_unlock_irqrestore(io_lock, flags);
1153
1154 fnic_release_ioreq_buf(fnic, io_req, sc);
1155 mempool_free(io_req, fnic->io_req_pool);
1156 if (sc->scsi_done) {
1157 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1158 sc->device->host->host_no, id,
1159 sc,
1160 jiffies_to_msecs(jiffies - start_time),
1161 desc,
1162 (((u64)hdr_status << 40) |
1163 (u64)sc->cmnd[0] << 32 |
1164 (u64)sc->cmnd[2] << 24 |
1165 (u64)sc->cmnd[3] << 16 |
1166 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1167 (((u64)CMD_FLAGS(sc) << 32) |
1168 CMD_STATE(sc)));
1169 sc->scsi_done(sc);
1170 atomic64_dec(&fnic_stats->io_stats.active_ios);
1171 if (atomic64_read(&fnic->io_cmpl_skip))
1172 atomic64_dec(&fnic->io_cmpl_skip);
1173 else
1174 atomic64_inc(&fnic_stats->io_stats.io_completions);
1175 }
1176 }
1177
1178 } else if (id & FNIC_TAG_DEV_RST) {
1179 /* Completion of device reset */
1180 CMD_LR_STATUS(sc) = hdr_status;
1181 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1182 spin_unlock_irqrestore(io_lock, flags);
1183 CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1184 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1185 sc->device->host->host_no, id, sc,
1186 jiffies_to_msecs(jiffies - start_time),
1187 desc, 0,
1188 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1189 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1190 "Terminate pending "
1191 "dev reset cmpl recd. id %d status %s\n",
1192 (int)(id & FNIC_TAG_MASK),
1193 fnic_fcpio_status_to_str(hdr_status));
1194 return;
1195 }
1196 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1197 /* Need to wait for terminate completion */
1198 spin_unlock_irqrestore(io_lock, flags);
1199 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1200 sc->device->host->host_no, id, sc,
1201 jiffies_to_msecs(jiffies - start_time),
1202 desc, 0,
1203 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1204 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1205 "dev reset cmpl recd after time out. "
1206 "id %d status %s\n",
1207 (int)(id & FNIC_TAG_MASK),
1208 fnic_fcpio_status_to_str(hdr_status));
1209 return;
1210 }
1211 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1212 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1213 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1214 "dev reset cmpl recd. id %d status %s\n",
1215 (int)(id & FNIC_TAG_MASK),
1216 fnic_fcpio_status_to_str(hdr_status));
1217 if (io_req->dr_done)
1218 complete(io_req->dr_done);
1219 spin_unlock_irqrestore(io_lock, flags);
1220
1221 } else {
1222 shost_printk(KERN_ERR, fnic->lport->host,
1223 "Unexpected itmf io state %s tag %x\n",
1224 fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1225 spin_unlock_irqrestore(io_lock, flags);
1226 }
1227
1228 }
1229
1230 /*
1231 * fnic_fcpio_cmpl_handler
1232 * Routine to service the cq for wq_copy
1233 */
fnic_fcpio_cmpl_handler(struct vnic_dev * vdev,unsigned int cq_index,struct fcpio_fw_req * desc)1234 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1235 unsigned int cq_index,
1236 struct fcpio_fw_req *desc)
1237 {
1238 struct fnic *fnic = vnic_dev_priv(vdev);
1239
1240 switch (desc->hdr.type) {
1241 case FCPIO_ICMND_CMPL: /* fw completed a command */
1242 case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1243 case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1244 case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1245 case FCPIO_RESET_CMPL: /* fw completed reset */
1246 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1247 break;
1248 default:
1249 break;
1250 }
1251
1252 switch (desc->hdr.type) {
1253 case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1254 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1255 break;
1256
1257 case FCPIO_ICMND_CMPL: /* fw completed a command */
1258 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1259 break;
1260
1261 case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1262 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1263 break;
1264
1265 case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1266 case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1267 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1268 break;
1269
1270 case FCPIO_RESET_CMPL: /* fw completed reset */
1271 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1272 break;
1273
1274 default:
1275 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1276 "firmware completion type %d\n",
1277 desc->hdr.type);
1278 break;
1279 }
1280
1281 return 0;
1282 }
1283
1284 /*
1285 * fnic_wq_copy_cmpl_handler
1286 * Routine to process wq copy
1287 */
fnic_wq_copy_cmpl_handler(struct fnic * fnic,int copy_work_to_do)1288 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1289 {
1290 unsigned int wq_work_done = 0;
1291 unsigned int i, cq_index;
1292 unsigned int cur_work_done;
1293
1294 for (i = 0; i < fnic->wq_copy_count; i++) {
1295 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1296 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1297 fnic_fcpio_cmpl_handler,
1298 copy_work_to_do);
1299 wq_work_done += cur_work_done;
1300 }
1301 return wq_work_done;
1302 }
1303
fnic_cleanup_io(struct fnic * fnic,int exclude_id)1304 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
1305 {
1306 int i;
1307 struct fnic_io_req *io_req;
1308 unsigned long flags = 0;
1309 struct scsi_cmnd *sc;
1310 spinlock_t *io_lock;
1311 unsigned long start_time = 0;
1312 struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1313
1314 for (i = 0; i < fnic->fnic_max_tag_id; i++) {
1315 if (i == exclude_id)
1316 continue;
1317
1318 io_lock = fnic_io_lock_tag(fnic, i);
1319 spin_lock_irqsave(io_lock, flags);
1320 sc = scsi_host_find_tag(fnic->lport->host, i);
1321 if (!sc) {
1322 spin_unlock_irqrestore(io_lock, flags);
1323 continue;
1324 }
1325
1326 io_req = (struct fnic_io_req *)CMD_SP(sc);
1327 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1328 !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1329 /*
1330 * We will be here only when FW completes reset
1331 * without sending completions for outstanding ios.
1332 */
1333 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1334 if (io_req && io_req->dr_done)
1335 complete(io_req->dr_done);
1336 else if (io_req && io_req->abts_done)
1337 complete(io_req->abts_done);
1338 spin_unlock_irqrestore(io_lock, flags);
1339 continue;
1340 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1341 spin_unlock_irqrestore(io_lock, flags);
1342 continue;
1343 }
1344 if (!io_req) {
1345 spin_unlock_irqrestore(io_lock, flags);
1346 goto cleanup_scsi_cmd;
1347 }
1348
1349 CMD_SP(sc) = NULL;
1350
1351 spin_unlock_irqrestore(io_lock, flags);
1352
1353 /*
1354 * If there is a scsi_cmnd associated with this io_req, then
1355 * free the corresponding state
1356 */
1357 start_time = io_req->start_time;
1358 fnic_release_ioreq_buf(fnic, io_req, sc);
1359 mempool_free(io_req, fnic->io_req_pool);
1360
1361 cleanup_scsi_cmd:
1362 sc->result = DID_TRANSPORT_DISRUPTED << 16;
1363 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1364 "%s: sc duration = %lu DID_TRANSPORT_DISRUPTED\n",
1365 __func__, (jiffies - start_time));
1366
1367 if (atomic64_read(&fnic->io_cmpl_skip))
1368 atomic64_dec(&fnic->io_cmpl_skip);
1369 else
1370 atomic64_inc(&fnic_stats->io_stats.io_completions);
1371
1372 /* Complete the command to SCSI */
1373 if (sc->scsi_done) {
1374 FNIC_TRACE(fnic_cleanup_io,
1375 sc->device->host->host_no, i, sc,
1376 jiffies_to_msecs(jiffies - start_time),
1377 0, ((u64)sc->cmnd[0] << 32 |
1378 (u64)sc->cmnd[2] << 24 |
1379 (u64)sc->cmnd[3] << 16 |
1380 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1381 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1382
1383 sc->scsi_done(sc);
1384 }
1385 }
1386 }
1387
fnic_wq_copy_cleanup_handler(struct vnic_wq_copy * wq,struct fcpio_host_req * desc)1388 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1389 struct fcpio_host_req *desc)
1390 {
1391 u32 id;
1392 struct fnic *fnic = vnic_dev_priv(wq->vdev);
1393 struct fnic_io_req *io_req;
1394 struct scsi_cmnd *sc;
1395 unsigned long flags;
1396 spinlock_t *io_lock;
1397 unsigned long start_time = 0;
1398
1399 /* get the tag reference */
1400 fcpio_tag_id_dec(&desc->hdr.tag, &id);
1401 id &= FNIC_TAG_MASK;
1402
1403 if (id >= fnic->fnic_max_tag_id)
1404 return;
1405
1406 sc = scsi_host_find_tag(fnic->lport->host, id);
1407 if (!sc)
1408 return;
1409
1410 io_lock = fnic_io_lock_hash(fnic, sc);
1411 spin_lock_irqsave(io_lock, flags);
1412
1413 /* Get the IO context which this desc refers to */
1414 io_req = (struct fnic_io_req *)CMD_SP(sc);
1415
1416 /* fnic interrupts are turned off by now */
1417
1418 if (!io_req) {
1419 spin_unlock_irqrestore(io_lock, flags);
1420 goto wq_copy_cleanup_scsi_cmd;
1421 }
1422
1423 CMD_SP(sc) = NULL;
1424
1425 spin_unlock_irqrestore(io_lock, flags);
1426
1427 start_time = io_req->start_time;
1428 fnic_release_ioreq_buf(fnic, io_req, sc);
1429 mempool_free(io_req, fnic->io_req_pool);
1430
1431 wq_copy_cleanup_scsi_cmd:
1432 sc->result = DID_NO_CONNECT << 16;
1433 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1434 " DID_NO_CONNECT\n");
1435
1436 if (sc->scsi_done) {
1437 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1438 sc->device->host->host_no, id, sc,
1439 jiffies_to_msecs(jiffies - start_time),
1440 0, ((u64)sc->cmnd[0] << 32 |
1441 (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1442 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1443 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1444
1445 sc->scsi_done(sc);
1446 }
1447 }
1448
fnic_queue_abort_io_req(struct fnic * fnic,int tag,u32 task_req,u8 * fc_lun,struct fnic_io_req * io_req)1449 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1450 u32 task_req, u8 *fc_lun,
1451 struct fnic_io_req *io_req)
1452 {
1453 struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1454 struct Scsi_Host *host = fnic->lport->host;
1455 struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1456 unsigned long flags;
1457
1458 spin_lock_irqsave(host->host_lock, flags);
1459 if (unlikely(fnic_chk_state_flags_locked(fnic,
1460 FNIC_FLAGS_IO_BLOCKED))) {
1461 spin_unlock_irqrestore(host->host_lock, flags);
1462 return 1;
1463 } else
1464 atomic_inc(&fnic->in_flight);
1465 spin_unlock_irqrestore(host->host_lock, flags);
1466
1467 spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1468
1469 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1470 free_wq_copy_descs(fnic, wq);
1471
1472 if (!vnic_wq_copy_desc_avail(wq)) {
1473 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1474 atomic_dec(&fnic->in_flight);
1475 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1476 "fnic_queue_abort_io_req: failure: no descriptors\n");
1477 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1478 return 1;
1479 }
1480 fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1481 0, task_req, tag, fc_lun, io_req->port_id,
1482 fnic->config.ra_tov, fnic->config.ed_tov);
1483
1484 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1485 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1486 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1487 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1488 atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1489
1490 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1491 atomic_dec(&fnic->in_flight);
1492
1493 return 0;
1494 }
1495
fnic_rport_exch_reset(struct fnic * fnic,u32 port_id)1496 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1497 {
1498 int tag;
1499 int abt_tag;
1500 int term_cnt = 0;
1501 struct fnic_io_req *io_req;
1502 spinlock_t *io_lock;
1503 unsigned long flags;
1504 struct scsi_cmnd *sc;
1505 struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1506 struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1507 struct scsi_lun fc_lun;
1508 enum fnic_ioreq_state old_ioreq_state;
1509
1510 FNIC_SCSI_DBG(KERN_DEBUG,
1511 fnic->lport->host,
1512 "fnic_rport_exch_reset called portid 0x%06x\n",
1513 port_id);
1514
1515 if (fnic->in_remove)
1516 return;
1517
1518 for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1519 abt_tag = tag;
1520 io_lock = fnic_io_lock_tag(fnic, tag);
1521 spin_lock_irqsave(io_lock, flags);
1522 sc = scsi_host_find_tag(fnic->lport->host, tag);
1523 if (!sc) {
1524 spin_unlock_irqrestore(io_lock, flags);
1525 continue;
1526 }
1527
1528 io_req = (struct fnic_io_req *)CMD_SP(sc);
1529
1530 if (!io_req || io_req->port_id != port_id) {
1531 spin_unlock_irqrestore(io_lock, flags);
1532 continue;
1533 }
1534
1535 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1536 (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1537 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1538 "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1539 sc);
1540 spin_unlock_irqrestore(io_lock, flags);
1541 continue;
1542 }
1543
1544 /*
1545 * Found IO that is still pending with firmware and
1546 * belongs to rport that went away
1547 */
1548 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1549 spin_unlock_irqrestore(io_lock, flags);
1550 continue;
1551 }
1552 if (io_req->abts_done) {
1553 shost_printk(KERN_ERR, fnic->lport->host,
1554 "fnic_rport_exch_reset: io_req->abts_done is set "
1555 "state is %s\n",
1556 fnic_ioreq_state_to_str(CMD_STATE(sc)));
1557 }
1558
1559 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1560 shost_printk(KERN_ERR, fnic->lport->host,
1561 "rport_exch_reset "
1562 "IO not yet issued %p tag 0x%x flags "
1563 "%x state %d\n",
1564 sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1565 }
1566 old_ioreq_state = CMD_STATE(sc);
1567 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1568 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1569 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1570 atomic64_inc(&reset_stats->device_reset_terminates);
1571 abt_tag = (tag | FNIC_TAG_DEV_RST);
1572 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1573 "fnic_rport_exch_reset dev rst sc 0x%p\n",
1574 sc);
1575 }
1576
1577 BUG_ON(io_req->abts_done);
1578
1579 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1580 "fnic_rport_reset_exch: Issuing abts\n");
1581
1582 spin_unlock_irqrestore(io_lock, flags);
1583
1584 /* Now queue the abort command to firmware */
1585 int_to_scsilun(sc->device->lun, &fc_lun);
1586
1587 if (fnic_queue_abort_io_req(fnic, abt_tag,
1588 FCPIO_ITMF_ABT_TASK_TERM,
1589 fc_lun.scsi_lun, io_req)) {
1590 /*
1591 * Revert the cmd state back to old state, if
1592 * it hasn't changed in between. This cmd will get
1593 * aborted later by scsi_eh, or cleaned up during
1594 * lun reset
1595 */
1596 spin_lock_irqsave(io_lock, flags);
1597 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1598 CMD_STATE(sc) = old_ioreq_state;
1599 spin_unlock_irqrestore(io_lock, flags);
1600 } else {
1601 spin_lock_irqsave(io_lock, flags);
1602 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1603 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1604 else
1605 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1606 spin_unlock_irqrestore(io_lock, flags);
1607 atomic64_inc(&term_stats->terminates);
1608 term_cnt++;
1609 }
1610 }
1611 if (term_cnt > atomic64_read(&term_stats->max_terminates))
1612 atomic64_set(&term_stats->max_terminates, term_cnt);
1613
1614 }
1615
fnic_terminate_rport_io(struct fc_rport * rport)1616 void fnic_terminate_rport_io(struct fc_rport *rport)
1617 {
1618 int tag;
1619 int abt_tag;
1620 int term_cnt = 0;
1621 struct fnic_io_req *io_req;
1622 spinlock_t *io_lock;
1623 unsigned long flags;
1624 struct scsi_cmnd *sc;
1625 struct scsi_lun fc_lun;
1626 struct fc_rport_libfc_priv *rdata;
1627 struct fc_lport *lport;
1628 struct fnic *fnic;
1629 struct fc_rport *cmd_rport;
1630 struct reset_stats *reset_stats;
1631 struct terminate_stats *term_stats;
1632 enum fnic_ioreq_state old_ioreq_state;
1633
1634 if (!rport) {
1635 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1636 return;
1637 }
1638 rdata = rport->dd_data;
1639
1640 if (!rdata) {
1641 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1642 return;
1643 }
1644 lport = rdata->local_port;
1645
1646 if (!lport) {
1647 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1648 return;
1649 }
1650 fnic = lport_priv(lport);
1651 FNIC_SCSI_DBG(KERN_DEBUG,
1652 fnic->lport->host, "fnic_terminate_rport_io called"
1653 " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1654 rport->port_name, rport->node_name, rport,
1655 rport->port_id);
1656
1657 if (fnic->in_remove)
1658 return;
1659
1660 reset_stats = &fnic->fnic_stats.reset_stats;
1661 term_stats = &fnic->fnic_stats.term_stats;
1662
1663 for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1664 abt_tag = tag;
1665 io_lock = fnic_io_lock_tag(fnic, tag);
1666 spin_lock_irqsave(io_lock, flags);
1667 sc = scsi_host_find_tag(fnic->lport->host, tag);
1668 if (!sc) {
1669 spin_unlock_irqrestore(io_lock, flags);
1670 continue;
1671 }
1672
1673 cmd_rport = starget_to_rport(scsi_target(sc->device));
1674 if (rport != cmd_rport) {
1675 spin_unlock_irqrestore(io_lock, flags);
1676 continue;
1677 }
1678
1679 io_req = (struct fnic_io_req *)CMD_SP(sc);
1680
1681 if (!io_req || rport != cmd_rport) {
1682 spin_unlock_irqrestore(io_lock, flags);
1683 continue;
1684 }
1685
1686 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1687 (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1688 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1689 "fnic_terminate_rport_io dev rst not pending sc 0x%p\n",
1690 sc);
1691 spin_unlock_irqrestore(io_lock, flags);
1692 continue;
1693 }
1694 /*
1695 * Found IO that is still pending with firmware and
1696 * belongs to rport that went away
1697 */
1698 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1699 spin_unlock_irqrestore(io_lock, flags);
1700 continue;
1701 }
1702 if (io_req->abts_done) {
1703 shost_printk(KERN_ERR, fnic->lport->host,
1704 "fnic_terminate_rport_io: io_req->abts_done is set "
1705 "state is %s\n",
1706 fnic_ioreq_state_to_str(CMD_STATE(sc)));
1707 }
1708 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1709 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1710 "fnic_terminate_rport_io "
1711 "IO not yet issued %p tag 0x%x flags "
1712 "%x state %d\n",
1713 sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1714 }
1715 old_ioreq_state = CMD_STATE(sc);
1716 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1717 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1718 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1719 atomic64_inc(&reset_stats->device_reset_terminates);
1720 abt_tag = (tag | FNIC_TAG_DEV_RST);
1721 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1722 "fnic_terminate_rport_io dev rst sc 0x%p\n", sc);
1723 }
1724
1725 BUG_ON(io_req->abts_done);
1726
1727 FNIC_SCSI_DBG(KERN_DEBUG,
1728 fnic->lport->host,
1729 "fnic_terminate_rport_io: Issuing abts\n");
1730
1731 spin_unlock_irqrestore(io_lock, flags);
1732
1733 /* Now queue the abort command to firmware */
1734 int_to_scsilun(sc->device->lun, &fc_lun);
1735
1736 if (fnic_queue_abort_io_req(fnic, abt_tag,
1737 FCPIO_ITMF_ABT_TASK_TERM,
1738 fc_lun.scsi_lun, io_req)) {
1739 /*
1740 * Revert the cmd state back to old state, if
1741 * it hasn't changed in between. This cmd will get
1742 * aborted later by scsi_eh, or cleaned up during
1743 * lun reset
1744 */
1745 spin_lock_irqsave(io_lock, flags);
1746 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1747 CMD_STATE(sc) = old_ioreq_state;
1748 spin_unlock_irqrestore(io_lock, flags);
1749 } else {
1750 spin_lock_irqsave(io_lock, flags);
1751 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1752 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1753 else
1754 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1755 spin_unlock_irqrestore(io_lock, flags);
1756 atomic64_inc(&term_stats->terminates);
1757 term_cnt++;
1758 }
1759 }
1760 if (term_cnt > atomic64_read(&term_stats->max_terminates))
1761 atomic64_set(&term_stats->max_terminates, term_cnt);
1762
1763 }
1764
1765 /*
1766 * This function is exported to SCSI for sending abort cmnds.
1767 * A SCSI IO is represented by a io_req in the driver.
1768 * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1769 */
fnic_abort_cmd(struct scsi_cmnd * sc)1770 int fnic_abort_cmd(struct scsi_cmnd *sc)
1771 {
1772 struct fc_lport *lp;
1773 struct fnic *fnic;
1774 struct fnic_io_req *io_req = NULL;
1775 struct fc_rport *rport;
1776 spinlock_t *io_lock;
1777 unsigned long flags;
1778 unsigned long start_time = 0;
1779 int ret = SUCCESS;
1780 u32 task_req = 0;
1781 struct scsi_lun fc_lun;
1782 struct fnic_stats *fnic_stats;
1783 struct abort_stats *abts_stats;
1784 struct terminate_stats *term_stats;
1785 enum fnic_ioreq_state old_ioreq_state;
1786 int tag;
1787 DECLARE_COMPLETION_ONSTACK(tm_done);
1788
1789 /* Wait for rport to unblock */
1790 fc_block_scsi_eh(sc);
1791
1792 /* Get local-port, check ready and link up */
1793 lp = shost_priv(sc->device->host);
1794
1795 fnic = lport_priv(lp);
1796 fnic_stats = &fnic->fnic_stats;
1797 abts_stats = &fnic->fnic_stats.abts_stats;
1798 term_stats = &fnic->fnic_stats.term_stats;
1799
1800 rport = starget_to_rport(scsi_target(sc->device));
1801 tag = sc->request->tag;
1802 FNIC_SCSI_DBG(KERN_DEBUG,
1803 fnic->lport->host,
1804 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1805 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1806
1807 CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1808
1809 if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1810 ret = FAILED;
1811 goto fnic_abort_cmd_end;
1812 }
1813
1814 /*
1815 * Avoid a race between SCSI issuing the abort and the device
1816 * completing the command.
1817 *
1818 * If the command is already completed by the fw cmpl code,
1819 * we just return SUCCESS from here. This means that the abort
1820 * succeeded. In the SCSI ML, since the timeout for command has
1821 * happened, the completion wont actually complete the command
1822 * and it will be considered as an aborted command
1823 *
1824 * The CMD_SP will not be cleared except while holding io_req_lock.
1825 */
1826 io_lock = fnic_io_lock_hash(fnic, sc);
1827 spin_lock_irqsave(io_lock, flags);
1828 io_req = (struct fnic_io_req *)CMD_SP(sc);
1829 if (!io_req) {
1830 spin_unlock_irqrestore(io_lock, flags);
1831 goto fnic_abort_cmd_end;
1832 }
1833
1834 io_req->abts_done = &tm_done;
1835
1836 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1837 spin_unlock_irqrestore(io_lock, flags);
1838 goto wait_pending;
1839 }
1840 /*
1841 * Command is still pending, need to abort it
1842 * If the firmware completes the command after this point,
1843 * the completion wont be done till mid-layer, since abort
1844 * has already started.
1845 */
1846 old_ioreq_state = CMD_STATE(sc);
1847 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1848 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1849
1850 spin_unlock_irqrestore(io_lock, flags);
1851
1852 /*
1853 * Check readiness of the remote port. If the path to remote
1854 * port is up, then send abts to the remote port to terminate
1855 * the IO. Else, just locally terminate the IO in the firmware
1856 */
1857 if (fc_remote_port_chkready(rport) == 0)
1858 task_req = FCPIO_ITMF_ABT_TASK;
1859 else {
1860 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1861 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1862 }
1863
1864 /* Now queue the abort command to firmware */
1865 int_to_scsilun(sc->device->lun, &fc_lun);
1866
1867 if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1868 fc_lun.scsi_lun, io_req)) {
1869 spin_lock_irqsave(io_lock, flags);
1870 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1871 CMD_STATE(sc) = old_ioreq_state;
1872 io_req = (struct fnic_io_req *)CMD_SP(sc);
1873 if (io_req)
1874 io_req->abts_done = NULL;
1875 spin_unlock_irqrestore(io_lock, flags);
1876 ret = FAILED;
1877 goto fnic_abort_cmd_end;
1878 }
1879 if (task_req == FCPIO_ITMF_ABT_TASK) {
1880 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1881 atomic64_inc(&fnic_stats->abts_stats.aborts);
1882 } else {
1883 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1884 atomic64_inc(&fnic_stats->term_stats.terminates);
1885 }
1886
1887 /*
1888 * We queued an abort IO, wait for its completion.
1889 * Once the firmware completes the abort command, it will
1890 * wake up this thread.
1891 */
1892 wait_pending:
1893 wait_for_completion_timeout(&tm_done,
1894 msecs_to_jiffies
1895 (2 * fnic->config.ra_tov +
1896 fnic->config.ed_tov));
1897
1898 /* Check the abort status */
1899 spin_lock_irqsave(io_lock, flags);
1900
1901 io_req = (struct fnic_io_req *)CMD_SP(sc);
1902 if (!io_req) {
1903 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1904 spin_unlock_irqrestore(io_lock, flags);
1905 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1906 ret = FAILED;
1907 goto fnic_abort_cmd_end;
1908 }
1909 io_req->abts_done = NULL;
1910
1911 /* fw did not complete abort, timed out */
1912 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1913 spin_unlock_irqrestore(io_lock, flags);
1914 if (task_req == FCPIO_ITMF_ABT_TASK) {
1915 atomic64_inc(&abts_stats->abort_drv_timeouts);
1916 } else {
1917 atomic64_inc(&term_stats->terminate_drv_timeouts);
1918 }
1919 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
1920 ret = FAILED;
1921 goto fnic_abort_cmd_end;
1922 }
1923
1924 /* IO out of order */
1925
1926 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
1927 spin_unlock_irqrestore(io_lock, flags);
1928 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1929 "Issuing Host reset due to out of order IO\n");
1930
1931 if (fnic_host_reset(sc) == FAILED) {
1932 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1933 "fnic_host_reset failed.\n");
1934 }
1935 ret = FAILED;
1936 goto fnic_abort_cmd_end;
1937 }
1938
1939 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1940
1941 start_time = io_req->start_time;
1942 /*
1943 * firmware completed the abort, check the status,
1944 * free the io_req if successful. If abort fails,
1945 * Device reset will clean the I/O.
1946 */
1947 if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
1948 CMD_SP(sc) = NULL;
1949 else {
1950 ret = FAILED;
1951 spin_unlock_irqrestore(io_lock, flags);
1952 goto fnic_abort_cmd_end;
1953 }
1954
1955 spin_unlock_irqrestore(io_lock, flags);
1956
1957 fnic_release_ioreq_buf(fnic, io_req, sc);
1958 mempool_free(io_req, fnic->io_req_pool);
1959
1960 if (sc->scsi_done) {
1961 /* Call SCSI completion function to complete the IO */
1962 sc->result = (DID_ABORT << 16);
1963 sc->scsi_done(sc);
1964 atomic64_dec(&fnic_stats->io_stats.active_ios);
1965 if (atomic64_read(&fnic->io_cmpl_skip))
1966 atomic64_dec(&fnic->io_cmpl_skip);
1967 else
1968 atomic64_inc(&fnic_stats->io_stats.io_completions);
1969 }
1970
1971 fnic_abort_cmd_end:
1972 FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
1973 sc->request->tag, sc,
1974 jiffies_to_msecs(jiffies - start_time),
1975 0, ((u64)sc->cmnd[0] << 32 |
1976 (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1977 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1978 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1979
1980 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1981 "Returning from abort cmd type %x %s\n", task_req,
1982 (ret == SUCCESS) ?
1983 "SUCCESS" : "FAILED");
1984 return ret;
1985 }
1986
fnic_queue_dr_io_req(struct fnic * fnic,struct scsi_cmnd * sc,struct fnic_io_req * io_req)1987 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
1988 struct scsi_cmnd *sc,
1989 struct fnic_io_req *io_req)
1990 {
1991 struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1992 struct Scsi_Host *host = fnic->lport->host;
1993 struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1994 struct scsi_lun fc_lun;
1995 int ret = 0;
1996 unsigned long intr_flags;
1997
1998 spin_lock_irqsave(host->host_lock, intr_flags);
1999 if (unlikely(fnic_chk_state_flags_locked(fnic,
2000 FNIC_FLAGS_IO_BLOCKED))) {
2001 spin_unlock_irqrestore(host->host_lock, intr_flags);
2002 return FAILED;
2003 } else
2004 atomic_inc(&fnic->in_flight);
2005 spin_unlock_irqrestore(host->host_lock, intr_flags);
2006
2007 spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
2008
2009 if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
2010 free_wq_copy_descs(fnic, wq);
2011
2012 if (!vnic_wq_copy_desc_avail(wq)) {
2013 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2014 "queue_dr_io_req failure - no descriptors\n");
2015 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
2016 ret = -EAGAIN;
2017 goto lr_io_req_end;
2018 }
2019
2020 /* fill in the lun info */
2021 int_to_scsilun(sc->device->lun, &fc_lun);
2022
2023 fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
2024 0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
2025 fc_lun.scsi_lun, io_req->port_id,
2026 fnic->config.ra_tov, fnic->config.ed_tov);
2027
2028 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2029 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2030 atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2031 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2032 atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2033
2034 lr_io_req_end:
2035 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2036 atomic_dec(&fnic->in_flight);
2037
2038 return ret;
2039 }
2040
2041 /*
2042 * Clean up any pending aborts on the lun
2043 * For each outstanding IO on this lun, whose abort is not completed by fw,
2044 * issue a local abort. Wait for abort to complete. Return 0 if all commands
2045 * successfully aborted, 1 otherwise
2046 */
fnic_clean_pending_aborts(struct fnic * fnic,struct scsi_cmnd * lr_sc,bool new_sc)2047 static int fnic_clean_pending_aborts(struct fnic *fnic,
2048 struct scsi_cmnd *lr_sc,
2049 bool new_sc)
2050
2051 {
2052 int tag, abt_tag;
2053 struct fnic_io_req *io_req;
2054 spinlock_t *io_lock;
2055 unsigned long flags;
2056 int ret = 0;
2057 struct scsi_cmnd *sc;
2058 struct scsi_lun fc_lun;
2059 struct scsi_device *lun_dev = lr_sc->device;
2060 DECLARE_COMPLETION_ONSTACK(tm_done);
2061 enum fnic_ioreq_state old_ioreq_state;
2062
2063 for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2064 io_lock = fnic_io_lock_tag(fnic, tag);
2065 spin_lock_irqsave(io_lock, flags);
2066 sc = scsi_host_find_tag(fnic->lport->host, tag);
2067 /*
2068 * ignore this lun reset cmd if issued using new SC
2069 * or cmds that do not belong to this lun
2070 */
2071 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) {
2072 spin_unlock_irqrestore(io_lock, flags);
2073 continue;
2074 }
2075
2076 io_req = (struct fnic_io_req *)CMD_SP(sc);
2077
2078 if (!io_req || sc->device != lun_dev) {
2079 spin_unlock_irqrestore(io_lock, flags);
2080 continue;
2081 }
2082
2083 /*
2084 * Found IO that is still pending with firmware and
2085 * belongs to the LUN that we are resetting
2086 */
2087 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2088 "Found IO in %s on lun\n",
2089 fnic_ioreq_state_to_str(CMD_STATE(sc)));
2090
2091 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2092 spin_unlock_irqrestore(io_lock, flags);
2093 continue;
2094 }
2095 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2096 (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2097 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2098 "%s dev rst not pending sc 0x%p\n", __func__,
2099 sc);
2100 spin_unlock_irqrestore(io_lock, flags);
2101 continue;
2102 }
2103
2104 if (io_req->abts_done)
2105 shost_printk(KERN_ERR, fnic->lport->host,
2106 "%s: io_req->abts_done is set state is %s\n",
2107 __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2108 old_ioreq_state = CMD_STATE(sc);
2109 /*
2110 * Any pending IO issued prior to reset is expected to be
2111 * in abts pending state, if not we need to set
2112 * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2113 * When IO is completed, the IO will be handed over and
2114 * handled in this function.
2115 */
2116 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2117
2118 BUG_ON(io_req->abts_done);
2119
2120 abt_tag = tag;
2121 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2122 abt_tag |= FNIC_TAG_DEV_RST;
2123 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2124 "%s: dev rst sc 0x%p\n", __func__, sc);
2125 }
2126
2127 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2128 io_req->abts_done = &tm_done;
2129 spin_unlock_irqrestore(io_lock, flags);
2130
2131 /* Now queue the abort command to firmware */
2132 int_to_scsilun(sc->device->lun, &fc_lun);
2133
2134 if (fnic_queue_abort_io_req(fnic, abt_tag,
2135 FCPIO_ITMF_ABT_TASK_TERM,
2136 fc_lun.scsi_lun, io_req)) {
2137 spin_lock_irqsave(io_lock, flags);
2138 io_req = (struct fnic_io_req *)CMD_SP(sc);
2139 if (io_req)
2140 io_req->abts_done = NULL;
2141 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2142 CMD_STATE(sc) = old_ioreq_state;
2143 spin_unlock_irqrestore(io_lock, flags);
2144 ret = 1;
2145 goto clean_pending_aborts_end;
2146 } else {
2147 spin_lock_irqsave(io_lock, flags);
2148 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2149 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2150 spin_unlock_irqrestore(io_lock, flags);
2151 }
2152 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2153
2154 wait_for_completion_timeout(&tm_done,
2155 msecs_to_jiffies
2156 (fnic->config.ed_tov));
2157
2158 /* Recheck cmd state to check if it is now aborted */
2159 spin_lock_irqsave(io_lock, flags);
2160 io_req = (struct fnic_io_req *)CMD_SP(sc);
2161 if (!io_req) {
2162 spin_unlock_irqrestore(io_lock, flags);
2163 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2164 continue;
2165 }
2166
2167 io_req->abts_done = NULL;
2168
2169 /* if abort is still pending with fw, fail */
2170 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2171 spin_unlock_irqrestore(io_lock, flags);
2172 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2173 ret = 1;
2174 goto clean_pending_aborts_end;
2175 }
2176 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2177
2178 /* original sc used for lr is handled by dev reset code */
2179 if (sc != lr_sc)
2180 CMD_SP(sc) = NULL;
2181 spin_unlock_irqrestore(io_lock, flags);
2182
2183 /* original sc used for lr is handled by dev reset code */
2184 if (sc != lr_sc) {
2185 fnic_release_ioreq_buf(fnic, io_req, sc);
2186 mempool_free(io_req, fnic->io_req_pool);
2187 }
2188
2189 /*
2190 * Any IO is returned during reset, it needs to call scsi_done
2191 * to return the scsi_cmnd to upper layer.
2192 */
2193 if (sc->scsi_done) {
2194 /* Set result to let upper SCSI layer retry */
2195 sc->result = DID_RESET << 16;
2196 sc->scsi_done(sc);
2197 }
2198 }
2199
2200 schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2201
2202 /* walk again to check, if IOs are still pending in fw */
2203 if (fnic_is_abts_pending(fnic, lr_sc))
2204 ret = FAILED;
2205
2206 clean_pending_aborts_end:
2207 return ret;
2208 }
2209
2210 /**
2211 * fnic_scsi_host_start_tag
2212 * Allocates tagid from host's tag list
2213 **/
2214 static inline int
fnic_scsi_host_start_tag(struct fnic * fnic,struct scsi_cmnd * sc)2215 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2216 {
2217 struct blk_queue_tag *bqt = fnic->lport->host->bqt;
2218 int tag, ret = SCSI_NO_TAG;
2219
2220 BUG_ON(!bqt);
2221 if (!bqt) {
2222 pr_err("Tags are not supported\n");
2223 goto end;
2224 }
2225
2226 do {
2227 tag = find_next_zero_bit(bqt->tag_map, bqt->max_depth, 1);
2228 if (tag >= bqt->max_depth) {
2229 pr_err("Tag allocation failure\n");
2230 goto end;
2231 }
2232 } while (test_and_set_bit(tag, bqt->tag_map));
2233
2234 bqt->tag_index[tag] = sc->request;
2235 sc->request->tag = tag;
2236 sc->tag = tag;
2237 if (!sc->request->special)
2238 sc->request->special = sc;
2239
2240 ret = tag;
2241
2242 end:
2243 return ret;
2244 }
2245
2246 /**
2247 * fnic_scsi_host_end_tag
2248 * frees tag allocated by fnic_scsi_host_start_tag.
2249 **/
2250 static inline void
fnic_scsi_host_end_tag(struct fnic * fnic,struct scsi_cmnd * sc)2251 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2252 {
2253 struct blk_queue_tag *bqt = fnic->lport->host->bqt;
2254 int tag = sc->request->tag;
2255
2256 if (tag == SCSI_NO_TAG)
2257 return;
2258
2259 BUG_ON(!bqt || !bqt->tag_index[tag]);
2260 if (!bqt)
2261 return;
2262
2263 bqt->tag_index[tag] = NULL;
2264 clear_bit(tag, bqt->tag_map);
2265
2266 return;
2267 }
2268
2269 /*
2270 * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2271 * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2272 * on the LUN.
2273 */
fnic_device_reset(struct scsi_cmnd * sc)2274 int fnic_device_reset(struct scsi_cmnd *sc)
2275 {
2276 struct fc_lport *lp;
2277 struct fnic *fnic;
2278 struct fnic_io_req *io_req = NULL;
2279 struct fc_rport *rport;
2280 int status;
2281 int ret = FAILED;
2282 spinlock_t *io_lock;
2283 unsigned long flags;
2284 unsigned long start_time = 0;
2285 struct scsi_lun fc_lun;
2286 struct fnic_stats *fnic_stats;
2287 struct reset_stats *reset_stats;
2288 int tag = 0;
2289 DECLARE_COMPLETION_ONSTACK(tm_done);
2290 int tag_gen_flag = 0; /*to track tags allocated by fnic driver*/
2291 bool new_sc = 0;
2292
2293 /* Wait for rport to unblock */
2294 fc_block_scsi_eh(sc);
2295
2296 /* Get local-port, check ready and link up */
2297 lp = shost_priv(sc->device->host);
2298
2299 fnic = lport_priv(lp);
2300 fnic_stats = &fnic->fnic_stats;
2301 reset_stats = &fnic->fnic_stats.reset_stats;
2302
2303 atomic64_inc(&reset_stats->device_resets);
2304
2305 rport = starget_to_rport(scsi_target(sc->device));
2306 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2307 "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2308 rport->port_id, sc->device->lun, sc);
2309
2310 if (lp->state != LPORT_ST_READY || !(lp->link_up))
2311 goto fnic_device_reset_end;
2312
2313 /* Check if remote port up */
2314 if (fc_remote_port_chkready(rport)) {
2315 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2316 goto fnic_device_reset_end;
2317 }
2318
2319 CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2320 /* Allocate tag if not present */
2321
2322 tag = sc->request->tag;
2323 if (unlikely(tag < 0)) {
2324 /*
2325 * XXX(hch): current the midlayer fakes up a struct
2326 * request for the explicit reset ioctls, and those
2327 * don't have a tag allocated to them. The below
2328 * code pokes into midlayer structures to paper over
2329 * this design issue, but that won't work for blk-mq.
2330 *
2331 * Either someone who can actually test the hardware
2332 * will have to come up with a similar hack for the
2333 * blk-mq case, or we'll have to bite the bullet and
2334 * fix the way the EH ioctls work for real, but until
2335 * that happens we fail these explicit requests here.
2336 */
2337
2338 tag = fnic_scsi_host_start_tag(fnic, sc);
2339 if (unlikely(tag == SCSI_NO_TAG))
2340 goto fnic_device_reset_end;
2341 tag_gen_flag = 1;
2342 new_sc = 1;
2343 }
2344 io_lock = fnic_io_lock_hash(fnic, sc);
2345 spin_lock_irqsave(io_lock, flags);
2346 io_req = (struct fnic_io_req *)CMD_SP(sc);
2347
2348 /*
2349 * If there is a io_req attached to this command, then use it,
2350 * else allocate a new one.
2351 */
2352 if (!io_req) {
2353 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2354 if (!io_req) {
2355 spin_unlock_irqrestore(io_lock, flags);
2356 goto fnic_device_reset_end;
2357 }
2358 memset(io_req, 0, sizeof(*io_req));
2359 io_req->port_id = rport->port_id;
2360 CMD_SP(sc) = (char *)io_req;
2361 }
2362 io_req->dr_done = &tm_done;
2363 CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2364 CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2365 spin_unlock_irqrestore(io_lock, flags);
2366
2367 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2368
2369 /*
2370 * issue the device reset, if enqueue failed, clean up the ioreq
2371 * and break assoc with scsi cmd
2372 */
2373 if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2374 spin_lock_irqsave(io_lock, flags);
2375 io_req = (struct fnic_io_req *)CMD_SP(sc);
2376 if (io_req)
2377 io_req->dr_done = NULL;
2378 goto fnic_device_reset_clean;
2379 }
2380 spin_lock_irqsave(io_lock, flags);
2381 CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2382 spin_unlock_irqrestore(io_lock, flags);
2383
2384 /*
2385 * Wait on the local completion for LUN reset. The io_req may be
2386 * freed while we wait since we hold no lock.
2387 */
2388 wait_for_completion_timeout(&tm_done,
2389 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2390
2391 spin_lock_irqsave(io_lock, flags);
2392 io_req = (struct fnic_io_req *)CMD_SP(sc);
2393 if (!io_req) {
2394 spin_unlock_irqrestore(io_lock, flags);
2395 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2396 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2397 goto fnic_device_reset_end;
2398 }
2399 io_req->dr_done = NULL;
2400
2401 status = CMD_LR_STATUS(sc);
2402
2403 /*
2404 * If lun reset not completed, bail out with failed. io_req
2405 * gets cleaned up during higher levels of EH
2406 */
2407 if (status == FCPIO_INVALID_CODE) {
2408 atomic64_inc(&reset_stats->device_reset_timeouts);
2409 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2410 "Device reset timed out\n");
2411 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2412 spin_unlock_irqrestore(io_lock, flags);
2413 int_to_scsilun(sc->device->lun, &fc_lun);
2414 /*
2415 * Issue abort and terminate on device reset request.
2416 * If q'ing of terminate fails, retry it after a delay.
2417 */
2418 while (1) {
2419 spin_lock_irqsave(io_lock, flags);
2420 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2421 spin_unlock_irqrestore(io_lock, flags);
2422 break;
2423 }
2424 spin_unlock_irqrestore(io_lock, flags);
2425 if (fnic_queue_abort_io_req(fnic,
2426 tag | FNIC_TAG_DEV_RST,
2427 FCPIO_ITMF_ABT_TASK_TERM,
2428 fc_lun.scsi_lun, io_req)) {
2429 wait_for_completion_timeout(&tm_done,
2430 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2431 } else {
2432 spin_lock_irqsave(io_lock, flags);
2433 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2434 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2435 io_req->abts_done = &tm_done;
2436 spin_unlock_irqrestore(io_lock, flags);
2437 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2438 "Abort and terminate issued on Device reset "
2439 "tag 0x%x sc 0x%p\n", tag, sc);
2440 break;
2441 }
2442 }
2443 while (1) {
2444 spin_lock_irqsave(io_lock, flags);
2445 if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2446 spin_unlock_irqrestore(io_lock, flags);
2447 wait_for_completion_timeout(&tm_done,
2448 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2449 break;
2450 } else {
2451 io_req = (struct fnic_io_req *)CMD_SP(sc);
2452 io_req->abts_done = NULL;
2453 goto fnic_device_reset_clean;
2454 }
2455 }
2456 } else {
2457 spin_unlock_irqrestore(io_lock, flags);
2458 }
2459
2460 /* Completed, but not successful, clean up the io_req, return fail */
2461 if (status != FCPIO_SUCCESS) {
2462 spin_lock_irqsave(io_lock, flags);
2463 FNIC_SCSI_DBG(KERN_DEBUG,
2464 fnic->lport->host,
2465 "Device reset completed - failed\n");
2466 io_req = (struct fnic_io_req *)CMD_SP(sc);
2467 goto fnic_device_reset_clean;
2468 }
2469
2470 /*
2471 * Clean up any aborts on this lun that have still not
2472 * completed. If any of these fail, then LUN reset fails.
2473 * clean_pending_aborts cleans all cmds on this lun except
2474 * the lun reset cmd. If all cmds get cleaned, the lun reset
2475 * succeeds
2476 */
2477 if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2478 spin_lock_irqsave(io_lock, flags);
2479 io_req = (struct fnic_io_req *)CMD_SP(sc);
2480 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2481 "Device reset failed"
2482 " since could not abort all IOs\n");
2483 goto fnic_device_reset_clean;
2484 }
2485
2486 /* Clean lun reset command */
2487 spin_lock_irqsave(io_lock, flags);
2488 io_req = (struct fnic_io_req *)CMD_SP(sc);
2489 if (io_req)
2490 /* Completed, and successful */
2491 ret = SUCCESS;
2492
2493 fnic_device_reset_clean:
2494 if (io_req)
2495 CMD_SP(sc) = NULL;
2496
2497 spin_unlock_irqrestore(io_lock, flags);
2498
2499 if (io_req) {
2500 start_time = io_req->start_time;
2501 fnic_release_ioreq_buf(fnic, io_req, sc);
2502 mempool_free(io_req, fnic->io_req_pool);
2503 }
2504
2505 fnic_device_reset_end:
2506 FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2507 sc->request->tag, sc,
2508 jiffies_to_msecs(jiffies - start_time),
2509 0, ((u64)sc->cmnd[0] << 32 |
2510 (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2511 (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2512 (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2513
2514 /* free tag if it is allocated */
2515 if (unlikely(tag_gen_flag))
2516 fnic_scsi_host_end_tag(fnic, sc);
2517
2518 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2519 "Returning from device reset %s\n",
2520 (ret == SUCCESS) ?
2521 "SUCCESS" : "FAILED");
2522
2523 if (ret == FAILED)
2524 atomic64_inc(&reset_stats->device_reset_failures);
2525
2526 return ret;
2527 }
2528
2529 /* Clean up all IOs, clean up libFC local port */
fnic_reset(struct Scsi_Host * shost)2530 int fnic_reset(struct Scsi_Host *shost)
2531 {
2532 struct fc_lport *lp;
2533 struct fnic *fnic;
2534 int ret = 0;
2535 struct reset_stats *reset_stats;
2536
2537 lp = shost_priv(shost);
2538 fnic = lport_priv(lp);
2539 reset_stats = &fnic->fnic_stats.reset_stats;
2540
2541 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2542 "fnic_reset called\n");
2543
2544 atomic64_inc(&reset_stats->fnic_resets);
2545
2546 /*
2547 * Reset local port, this will clean up libFC exchanges,
2548 * reset remote port sessions, and if link is up, begin flogi
2549 */
2550 ret = lp->tt.lport_reset(lp);
2551
2552 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2553 "Returning from fnic reset %s\n",
2554 (ret == 0) ?
2555 "SUCCESS" : "FAILED");
2556
2557 if (ret == 0)
2558 atomic64_inc(&reset_stats->fnic_reset_completions);
2559 else
2560 atomic64_inc(&reset_stats->fnic_reset_failures);
2561
2562 return ret;
2563 }
2564
2565 /*
2566 * SCSI Error handling calls driver's eh_host_reset if all prior
2567 * error handling levels return FAILED. If host reset completes
2568 * successfully, and if link is up, then Fabric login begins.
2569 *
2570 * Host Reset is the highest level of error recovery. If this fails, then
2571 * host is offlined by SCSI.
2572 *
2573 */
fnic_host_reset(struct scsi_cmnd * sc)2574 int fnic_host_reset(struct scsi_cmnd *sc)
2575 {
2576 int ret;
2577 unsigned long wait_host_tmo;
2578 struct Scsi_Host *shost = sc->device->host;
2579 struct fc_lport *lp = shost_priv(shost);
2580 struct fnic *fnic = lport_priv(lp);
2581 unsigned long flags;
2582
2583 spin_lock_irqsave(&fnic->fnic_lock, flags);
2584 if (fnic->internal_reset_inprogress == 0) {
2585 fnic->internal_reset_inprogress = 1;
2586 } else {
2587 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2588 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2589 "host reset in progress skipping another host reset\n");
2590 return SUCCESS;
2591 }
2592 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2593
2594 /*
2595 * If fnic_reset is successful, wait for fabric login to complete
2596 * scsi-ml tries to send a TUR to every device if host reset is
2597 * successful, so before returning to scsi, fabric should be up
2598 */
2599 ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2600 if (ret == SUCCESS) {
2601 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2602 ret = FAILED;
2603 while (time_before(jiffies, wait_host_tmo)) {
2604 if ((lp->state == LPORT_ST_READY) &&
2605 (lp->link_up)) {
2606 ret = SUCCESS;
2607 break;
2608 }
2609 ssleep(1);
2610 }
2611 }
2612
2613 spin_lock_irqsave(&fnic->fnic_lock, flags);
2614 fnic->internal_reset_inprogress = 0;
2615 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2616 return ret;
2617 }
2618
2619 /*
2620 * This fxn is called from libFC when host is removed
2621 */
fnic_scsi_abort_io(struct fc_lport * lp)2622 void fnic_scsi_abort_io(struct fc_lport *lp)
2623 {
2624 int err = 0;
2625 unsigned long flags;
2626 enum fnic_state old_state;
2627 struct fnic *fnic = lport_priv(lp);
2628 DECLARE_COMPLETION_ONSTACK(remove_wait);
2629
2630 /* Issue firmware reset for fnic, wait for reset to complete */
2631 retry_fw_reset:
2632 spin_lock_irqsave(&fnic->fnic_lock, flags);
2633 if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2634 /* fw reset is in progress, poll for its completion */
2635 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2636 schedule_timeout(msecs_to_jiffies(100));
2637 goto retry_fw_reset;
2638 }
2639
2640 fnic->remove_wait = &remove_wait;
2641 old_state = fnic->state;
2642 fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2643 fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2644 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2645
2646 err = fnic_fw_reset_handler(fnic);
2647 if (err) {
2648 spin_lock_irqsave(&fnic->fnic_lock, flags);
2649 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2650 fnic->state = old_state;
2651 fnic->remove_wait = NULL;
2652 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2653 return;
2654 }
2655
2656 /* Wait for firmware reset to complete */
2657 wait_for_completion_timeout(&remove_wait,
2658 msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2659
2660 spin_lock_irqsave(&fnic->fnic_lock, flags);
2661 fnic->remove_wait = NULL;
2662 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2663 "fnic_scsi_abort_io %s\n",
2664 (fnic->state == FNIC_IN_ETH_MODE) ?
2665 "SUCCESS" : "FAILED");
2666 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2667
2668 }
2669
2670 /*
2671 * This fxn called from libFC to clean up driver IO state on link down
2672 */
fnic_scsi_cleanup(struct fc_lport * lp)2673 void fnic_scsi_cleanup(struct fc_lport *lp)
2674 {
2675 unsigned long flags;
2676 enum fnic_state old_state;
2677 struct fnic *fnic = lport_priv(lp);
2678
2679 /* issue fw reset */
2680 retry_fw_reset:
2681 spin_lock_irqsave(&fnic->fnic_lock, flags);
2682 if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2683 /* fw reset is in progress, poll for its completion */
2684 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2685 schedule_timeout(msecs_to_jiffies(100));
2686 goto retry_fw_reset;
2687 }
2688 old_state = fnic->state;
2689 fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2690 fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2691 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2692
2693 if (fnic_fw_reset_handler(fnic)) {
2694 spin_lock_irqsave(&fnic->fnic_lock, flags);
2695 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2696 fnic->state = old_state;
2697 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2698 }
2699
2700 }
2701
fnic_empty_scsi_cleanup(struct fc_lport * lp)2702 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2703 {
2704 }
2705
fnic_exch_mgr_reset(struct fc_lport * lp,u32 sid,u32 did)2706 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2707 {
2708 struct fnic *fnic = lport_priv(lp);
2709
2710 /* Non-zero sid, nothing to do */
2711 if (sid)
2712 goto call_fc_exch_mgr_reset;
2713
2714 if (did) {
2715 fnic_rport_exch_reset(fnic, did);
2716 goto call_fc_exch_mgr_reset;
2717 }
2718
2719 /*
2720 * sid = 0, did = 0
2721 * link down or device being removed
2722 */
2723 if (!fnic->in_remove)
2724 fnic_scsi_cleanup(lp);
2725 else
2726 fnic_scsi_abort_io(lp);
2727
2728 /* call libFC exch mgr reset to reset its exchanges */
2729 call_fc_exch_mgr_reset:
2730 fc_exch_mgr_reset(lp, sid, did);
2731
2732 }
2733
2734 /*
2735 * fnic_is_abts_pending() is a helper function that
2736 * walks through tag map to check if there is any IOs pending,if there is one,
2737 * then it returns 1 (true), otherwise 0 (false)
2738 * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2739 * otherwise, it checks for all IOs.
2740 */
fnic_is_abts_pending(struct fnic * fnic,struct scsi_cmnd * lr_sc)2741 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2742 {
2743 int tag;
2744 struct fnic_io_req *io_req;
2745 spinlock_t *io_lock;
2746 unsigned long flags;
2747 int ret = 0;
2748 struct scsi_cmnd *sc;
2749 struct scsi_device *lun_dev = NULL;
2750
2751 if (lr_sc)
2752 lun_dev = lr_sc->device;
2753
2754 /* walk again to check, if IOs are still pending in fw */
2755 for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2756 sc = scsi_host_find_tag(fnic->lport->host, tag);
2757 /*
2758 * ignore this lun reset cmd or cmds that do not belong to
2759 * this lun
2760 */
2761 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc)))
2762 continue;
2763
2764 io_lock = fnic_io_lock_hash(fnic, sc);
2765 spin_lock_irqsave(io_lock, flags);
2766
2767 io_req = (struct fnic_io_req *)CMD_SP(sc);
2768
2769 if (!io_req || sc->device != lun_dev) {
2770 spin_unlock_irqrestore(io_lock, flags);
2771 continue;
2772 }
2773
2774 /*
2775 * Found IO that is still pending with firmware and
2776 * belongs to the LUN that we are resetting
2777 */
2778 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2779 "Found IO in %s on lun\n",
2780 fnic_ioreq_state_to_str(CMD_STATE(sc)));
2781
2782 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2783 ret = 1;
2784 spin_unlock_irqrestore(io_lock, flags);
2785 }
2786
2787 return ret;
2788 }
2789