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WIP FPC-III support
[linux/fpc-iii.git] / drivers / scsi / qedf / qedf_io.c
blob4869ef813dc4ff8cdbde6d5a347248c7a178874c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * QLogic FCoE Offload Driver
4 * Copyright (c) 2016-2018 Cavium Inc.
5 */
6 #include <linux/spinlock.h>
7 #include <linux/vmalloc.h>
8 #include "qedf.h"
9 #include <scsi/scsi_tcq.h>
10
11 void qedf_cmd_timer_set(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
12 unsigned int timer_msec)
13 {
14 queue_delayed_work(qedf->timer_work_queue, &io_req->timeout_work,
15 msecs_to_jiffies(timer_msec));
16 }
17
18 static void qedf_cmd_timeout(struct work_struct *work)
19 {
20
21 struct qedf_ioreq *io_req =
22 container_of(work, struct qedf_ioreq, timeout_work.work);
23 struct qedf_ctx *qedf;
24 struct qedf_rport *fcport;
25
26 if (io_req == NULL) {
27 QEDF_INFO(NULL, QEDF_LOG_IO, "io_req is NULL.\n");
28 return;
29 }
30
31 fcport = io_req->fcport;
32 if (io_req->fcport == NULL) {
33 QEDF_INFO(NULL, QEDF_LOG_IO, "fcport is NULL.\n");
34 return;
35 }
36
37 qedf = fcport->qedf;
38
39 switch (io_req->cmd_type) {
40 case QEDF_ABTS:
41 if (qedf == NULL) {
42 QEDF_INFO(NULL, QEDF_LOG_IO,
43 "qedf is NULL for ABTS xid=0x%x.\n",
44 io_req->xid);
45 return;
46 }
47
48 QEDF_ERR((&qedf->dbg_ctx), "ABTS timeout, xid=0x%x.\n",
49 io_req->xid);
50 /* Cleanup timed out ABTS */
51 qedf_initiate_cleanup(io_req, true);
52 complete(&io_req->abts_done);
53
54 /*
55 * Need to call kref_put for reference taken when initiate_abts
56 * was called since abts_compl won't be called now that we've
57 * cleaned up the task.
58 */
59 kref_put(&io_req->refcount, qedf_release_cmd);
60
61 /* Clear in abort bit now that we're done with the command */
62 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
63
64 /*
65 * Now that the original I/O and the ABTS are complete see
66 * if we need to reconnect to the target.
67 */
68 qedf_restart_rport(fcport);
69 break;
70 case QEDF_ELS:
71 if (!qedf) {
72 QEDF_INFO(NULL, QEDF_LOG_IO,
73 "qedf is NULL for ELS xid=0x%x.\n",
74 io_req->xid);
75 return;
76 }
77 /* ELS request no longer outstanding since it timed out */
78 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
79
80 kref_get(&io_req->refcount);
81 /*
82 * Don't attempt to clean an ELS timeout as any subseqeunt
83 * ABTS or cleanup requests just hang. For now just free
84 * the resources of the original I/O and the RRQ
85 */
86 QEDF_ERR(&(qedf->dbg_ctx), "ELS timeout, xid=0x%x.\n",
87 io_req->xid);
88 qedf_initiate_cleanup(io_req, true);
89 io_req->event = QEDF_IOREQ_EV_ELS_TMO;
90 /* Call callback function to complete command */
91 if (io_req->cb_func && io_req->cb_arg) {
92 io_req->cb_func(io_req->cb_arg);
93 io_req->cb_arg = NULL;
94 }
95 kref_put(&io_req->refcount, qedf_release_cmd);
96 break;
97 case QEDF_SEQ_CLEANUP:
98 QEDF_ERR(&(qedf->dbg_ctx), "Sequence cleanup timeout, "
99 "xid=0x%x.\n", io_req->xid);
100 qedf_initiate_cleanup(io_req, true);
101 io_req->event = QEDF_IOREQ_EV_ELS_TMO;
102 qedf_process_seq_cleanup_compl(qedf, NULL, io_req);
103 break;
104 default:
105 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
106 "Hit default case, xid=0x%x.\n", io_req->xid);
107 break;
108 }
109 }
110
111 void qedf_cmd_mgr_free(struct qedf_cmd_mgr *cmgr)
112 {
113 struct io_bdt *bdt_info;
114 struct qedf_ctx *qedf = cmgr->qedf;
115 size_t bd_tbl_sz;
116 u16 min_xid = 0;
117 u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
118 int num_ios;
119 int i;
120 struct qedf_ioreq *io_req;
121
122 num_ios = max_xid - min_xid + 1;
123
124 /* Free fcoe_bdt_ctx structures */
125 if (!cmgr->io_bdt_pool) {
126 QEDF_ERR(&qedf->dbg_ctx, "io_bdt_pool is NULL.\n");
127 goto free_cmd_pool;
128 }
129
130 bd_tbl_sz = QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge);
131 for (i = 0; i < num_ios; i++) {
132 bdt_info = cmgr->io_bdt_pool[i];
133 if (bdt_info->bd_tbl) {
134 dma_free_coherent(&qedf->pdev->dev, bd_tbl_sz,
135 bdt_info->bd_tbl, bdt_info->bd_tbl_dma);
136 bdt_info->bd_tbl = NULL;
137 }
138 }
139
140 /* Destroy io_bdt pool */
141 for (i = 0; i < num_ios; i++) {
142 kfree(cmgr->io_bdt_pool[i]);
143 cmgr->io_bdt_pool[i] = NULL;
144 }
145
146 kfree(cmgr->io_bdt_pool);
147 cmgr->io_bdt_pool = NULL;
148
149 free_cmd_pool:
150
151 for (i = 0; i < num_ios; i++) {
152 io_req = &cmgr->cmds[i];
153 kfree(io_req->sgl_task_params);
154 kfree(io_req->task_params);
155 /* Make sure we free per command sense buffer */
156 if (io_req->sense_buffer)
157 dma_free_coherent(&qedf->pdev->dev,
158 QEDF_SCSI_SENSE_BUFFERSIZE, io_req->sense_buffer,
159 io_req->sense_buffer_dma);
160 cancel_delayed_work_sync(&io_req->rrq_work);
161 }
162
163 /* Free command manager itself */
164 vfree(cmgr);
165 }
166
167 static void qedf_handle_rrq(struct work_struct *work)
168 {
169 struct qedf_ioreq *io_req =
170 container_of(work, struct qedf_ioreq, rrq_work.work);
171
172 atomic_set(&io_req->state, QEDFC_CMD_ST_RRQ_ACTIVE);
173 qedf_send_rrq(io_req);
174
175 }
176
177 struct qedf_cmd_mgr *qedf_cmd_mgr_alloc(struct qedf_ctx *qedf)
178 {
179 struct qedf_cmd_mgr *cmgr;
180 struct io_bdt *bdt_info;
181 struct qedf_ioreq *io_req;
182 u16 xid;
183 int i;
184 int num_ios;
185 u16 min_xid = 0;
186 u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
187
188 /* Make sure num_queues is already set before calling this function */
189 if (!qedf->num_queues) {
190 QEDF_ERR(&(qedf->dbg_ctx), "num_queues is not set.\n");
191 return NULL;
192 }
193
194 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
195 QEDF_WARN(&(qedf->dbg_ctx), "Invalid min_xid 0x%x and "
196 "max_xid 0x%x.\n", min_xid, max_xid);
197 return NULL;
198 }
199
200 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "min xid 0x%x, max xid "
201 "0x%x.\n", min_xid, max_xid);
202
203 num_ios = max_xid - min_xid + 1;
204
205 cmgr = vzalloc(sizeof(struct qedf_cmd_mgr));
206 if (!cmgr) {
207 QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc cmd mgr.\n");
208 return NULL;
209 }
210
211 cmgr->qedf = qedf;
212 spin_lock_init(&cmgr->lock);
213
214 /*
215 * Initialize I/O request fields.
216 */
217 xid = 0;
218
219 for (i = 0; i < num_ios; i++) {
220 io_req = &cmgr->cmds[i];
221 INIT_DELAYED_WORK(&io_req->timeout_work, qedf_cmd_timeout);
222
223 io_req->xid = xid++;
224
225 INIT_DELAYED_WORK(&io_req->rrq_work, qedf_handle_rrq);
226
227 /* Allocate DMA memory to hold sense buffer */
228 io_req->sense_buffer = dma_alloc_coherent(&qedf->pdev->dev,
229 QEDF_SCSI_SENSE_BUFFERSIZE, &io_req->sense_buffer_dma,
230 GFP_KERNEL);
231 if (!io_req->sense_buffer) {
232 QEDF_ERR(&qedf->dbg_ctx,
233 "Failed to alloc sense buffer.\n");
234 goto mem_err;
235 }
236
237 /* Allocate task parameters to pass to f/w init funcions */
238 io_req->task_params = kzalloc(sizeof(*io_req->task_params),
239 GFP_KERNEL);
240 if (!io_req->task_params) {
241 QEDF_ERR(&(qedf->dbg_ctx),
242 "Failed to allocate task_params for xid=0x%x\n",
243 i);
244 goto mem_err;
245 }
246
247 /*
248 * Allocate scatter/gather list info to pass to f/w init
249 * functions.
250 */
251 io_req->sgl_task_params = kzalloc(
252 sizeof(struct scsi_sgl_task_params), GFP_KERNEL);
253 if (!io_req->sgl_task_params) {
254 QEDF_ERR(&(qedf->dbg_ctx),
255 "Failed to allocate sgl_task_params for xid=0x%x\n",
256 i);
257 goto mem_err;
258 }
259 }
260
261 /* Allocate pool of io_bdts - one for each qedf_ioreq */
262 cmgr->io_bdt_pool = kmalloc_array(num_ios, sizeof(struct io_bdt *),
263 GFP_KERNEL);
264
265 if (!cmgr->io_bdt_pool) {
266 QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc io_bdt_pool.\n");
267 goto mem_err;
268 }
269
270 for (i = 0; i < num_ios; i++) {
271 cmgr->io_bdt_pool[i] = kmalloc(sizeof(struct io_bdt),
272 GFP_KERNEL);
273 if (!cmgr->io_bdt_pool[i]) {
274 QEDF_WARN(&(qedf->dbg_ctx),
275 "Failed to alloc io_bdt_pool[%d].\n", i);
276 goto mem_err;
277 }
278 }
279
280 for (i = 0; i < num_ios; i++) {
281 bdt_info = cmgr->io_bdt_pool[i];
282 bdt_info->bd_tbl = dma_alloc_coherent(&qedf->pdev->dev,
283 QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge),
284 &bdt_info->bd_tbl_dma, GFP_KERNEL);
285 if (!bdt_info->bd_tbl) {
286 QEDF_WARN(&(qedf->dbg_ctx),
287 "Failed to alloc bdt_tbl[%d].\n", i);
288 goto mem_err;
289 }
290 }
291 atomic_set(&cmgr->free_list_cnt, num_ios);
292 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
293 "cmgr->free_list_cnt=%d.\n",
294 atomic_read(&cmgr->free_list_cnt));
295
296 return cmgr;
297
298 mem_err:
299 qedf_cmd_mgr_free(cmgr);
300 return NULL;
301 }
302
303 struct qedf_ioreq *qedf_alloc_cmd(struct qedf_rport *fcport, u8 cmd_type)
304 {
305 struct qedf_ctx *qedf = fcport->qedf;
306 struct qedf_cmd_mgr *cmd_mgr = qedf->cmd_mgr;
307 struct qedf_ioreq *io_req = NULL;
308 struct io_bdt *bd_tbl;
309 u16 xid;
310 uint32_t free_sqes;
311 int i;
312 unsigned long flags;
313
314 free_sqes = atomic_read(&fcport->free_sqes);
315
316 if (!free_sqes) {
317 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
318 "Returning NULL, free_sqes=%d.\n ",
319 free_sqes);
320 goto out_failed;
321 }
322
323 /* Limit the number of outstanding R/W tasks */
324 if ((atomic_read(&fcport->num_active_ios) >=
325 NUM_RW_TASKS_PER_CONNECTION)) {
326 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
327 "Returning NULL, num_active_ios=%d.\n",
328 atomic_read(&fcport->num_active_ios));
329 goto out_failed;
330 }
331
332 /* Limit global TIDs certain tasks */
333 if (atomic_read(&cmd_mgr->free_list_cnt) <= GBL_RSVD_TASKS) {
334 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
335 "Returning NULL, free_list_cnt=%d.\n",
336 atomic_read(&cmd_mgr->free_list_cnt));
337 goto out_failed;
338 }
339
340 spin_lock_irqsave(&cmd_mgr->lock, flags);
341 for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
342 io_req = &cmd_mgr->cmds[cmd_mgr->idx];
343 cmd_mgr->idx++;
344 if (cmd_mgr->idx == FCOE_PARAMS_NUM_TASKS)
345 cmd_mgr->idx = 0;
346
347 /* Check to make sure command was previously freed */
348 if (!io_req->alloc)
349 break;
350 }
351
352 if (i == FCOE_PARAMS_NUM_TASKS) {
353 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
354 goto out_failed;
355 }
356
357 if (test_bit(QEDF_CMD_DIRTY, &io_req->flags))
358 QEDF_ERR(&qedf->dbg_ctx,
359 "io_req found to be dirty ox_id = 0x%x.\n",
360 io_req->xid);
361
362 /* Clear any flags now that we've reallocated the xid */
363 io_req->flags = 0;
364 io_req->alloc = 1;
365 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
366
367 atomic_inc(&fcport->num_active_ios);
368 atomic_dec(&fcport->free_sqes);
369 xid = io_req->xid;
370 atomic_dec(&cmd_mgr->free_list_cnt);
371
372 io_req->cmd_mgr = cmd_mgr;
373 io_req->fcport = fcport;
374
375 /* Clear any stale sc_cmd back pointer */
376 io_req->sc_cmd = NULL;
377 io_req->lun = -1;
378
379 /* Hold the io_req against deletion */
380 kref_init(&io_req->refcount); /* ID: 001 */
381 atomic_set(&io_req->state, QEDFC_CMD_ST_IO_ACTIVE);
382
383 /* Bind io_bdt for this io_req */
384 /* Have a static link between io_req and io_bdt_pool */
385 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
386 if (bd_tbl == NULL) {
387 QEDF_ERR(&(qedf->dbg_ctx), "bd_tbl is NULL, xid=%x.\n", xid);
388 kref_put(&io_req->refcount, qedf_release_cmd);
389 goto out_failed;
390 }
391 bd_tbl->io_req = io_req;
392 io_req->cmd_type = cmd_type;
393 io_req->tm_flags = 0;
394
395 /* Reset sequence offset data */
396 io_req->rx_buf_off = 0;
397 io_req->tx_buf_off = 0;
398 io_req->rx_id = 0xffff; /* No OX_ID */
399
400 return io_req;
401
402 out_failed:
403 /* Record failure for stats and return NULL to caller */
404 qedf->alloc_failures++;
405 return NULL;
406 }
407
408 static void qedf_free_mp_resc(struct qedf_ioreq *io_req)
409 {
410 struct qedf_mp_req *mp_req = &(io_req->mp_req);
411 struct qedf_ctx *qedf = io_req->fcport->qedf;
412 uint64_t sz = sizeof(struct scsi_sge);
413
414 /* clear tm flags */
415 if (mp_req->mp_req_bd) {
416 dma_free_coherent(&qedf->pdev->dev, sz,
417 mp_req->mp_req_bd, mp_req->mp_req_bd_dma);
418 mp_req->mp_req_bd = NULL;
419 }
420 if (mp_req->mp_resp_bd) {
421 dma_free_coherent(&qedf->pdev->dev, sz,
422 mp_req->mp_resp_bd, mp_req->mp_resp_bd_dma);
423 mp_req->mp_resp_bd = NULL;
424 }
425 if (mp_req->req_buf) {
426 dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
427 mp_req->req_buf, mp_req->req_buf_dma);
428 mp_req->req_buf = NULL;
429 }
430 if (mp_req->resp_buf) {
431 dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
432 mp_req->resp_buf, mp_req->resp_buf_dma);
433 mp_req->resp_buf = NULL;
434 }
435 }
436
437 void qedf_release_cmd(struct kref *ref)
438 {
439 struct qedf_ioreq *io_req =
440 container_of(ref, struct qedf_ioreq, refcount);
441 struct qedf_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
442 struct qedf_rport *fcport = io_req->fcport;
443 unsigned long flags;
444
445 if (io_req->cmd_type == QEDF_SCSI_CMD) {
446 QEDF_WARN(&fcport->qedf->dbg_ctx,
447 "Cmd released called without scsi_done called, io_req %p xid=0x%x.\n",
448 io_req, io_req->xid);
449 WARN_ON(io_req->sc_cmd);
450 }
451
452 if (io_req->cmd_type == QEDF_ELS ||
453 io_req->cmd_type == QEDF_TASK_MGMT_CMD)
454 qedf_free_mp_resc(io_req);
455
456 atomic_inc(&cmd_mgr->free_list_cnt);
457 atomic_dec(&fcport->num_active_ios);
458 atomic_set(&io_req->state, QEDF_CMD_ST_INACTIVE);
459 if (atomic_read(&fcport->num_active_ios) < 0) {
460 QEDF_WARN(&(fcport->qedf->dbg_ctx), "active_ios < 0.\n");
461 WARN_ON(1);
462 }
463
464 /* Increment task retry identifier now that the request is released */
465 io_req->task_retry_identifier++;
466 io_req->fcport = NULL;
467
468 clear_bit(QEDF_CMD_DIRTY, &io_req->flags);
469 io_req->cpu = 0;
470 spin_lock_irqsave(&cmd_mgr->lock, flags);
471 io_req->fcport = NULL;
472 io_req->alloc = 0;
473 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
474 }
475
476 static int qedf_map_sg(struct qedf_ioreq *io_req)
477 {
478 struct scsi_cmnd *sc = io_req->sc_cmd;
479 struct Scsi_Host *host = sc->device->host;
480 struct fc_lport *lport = shost_priv(host);
481 struct qedf_ctx *qedf = lport_priv(lport);
482 struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
483 struct scatterlist *sg;
484 int byte_count = 0;
485 int sg_count = 0;
486 int bd_count = 0;
487 u32 sg_len;
488 u64 addr;
489 int i = 0;
490
491 sg_count = dma_map_sg(&qedf->pdev->dev, scsi_sglist(sc),
492 scsi_sg_count(sc), sc->sc_data_direction);
493 sg = scsi_sglist(sc);
494
495 io_req->sge_type = QEDF_IOREQ_UNKNOWN_SGE;
496
497 if (sg_count <= 8 || io_req->io_req_flags == QEDF_READ)
498 io_req->sge_type = QEDF_IOREQ_FAST_SGE;
499
500 scsi_for_each_sg(sc, sg, sg_count, i) {
501 sg_len = (u32)sg_dma_len(sg);
502 addr = (u64)sg_dma_address(sg);
503
504 /*
505 * Intermediate s/g element so check if start address
506 * is page aligned. Only required for writes and only if the
507 * number of scatter/gather elements is 8 or more.
508 */
509 if (io_req->sge_type == QEDF_IOREQ_UNKNOWN_SGE && (i) &&
510 (i != (sg_count - 1)) && sg_len < QEDF_PAGE_SIZE)
511 io_req->sge_type = QEDF_IOREQ_SLOW_SGE;
512
513 bd[bd_count].sge_addr.lo = cpu_to_le32(U64_LO(addr));
514 bd[bd_count].sge_addr.hi = cpu_to_le32(U64_HI(addr));
515 bd[bd_count].sge_len = cpu_to_le32(sg_len);
516
517 bd_count++;
518 byte_count += sg_len;
519 }
520
521 /* To catch a case where FAST and SLOW nothing is set, set FAST */
522 if (io_req->sge_type == QEDF_IOREQ_UNKNOWN_SGE)
523 io_req->sge_type = QEDF_IOREQ_FAST_SGE;
524
525 if (byte_count != scsi_bufflen(sc))
526 QEDF_ERR(&(qedf->dbg_ctx), "byte_count = %d != "
527 "scsi_bufflen = %d, task_id = 0x%x.\n", byte_count,
528 scsi_bufflen(sc), io_req->xid);
529
530 return bd_count;
531 }
532
533 static int qedf_build_bd_list_from_sg(struct qedf_ioreq *io_req)
534 {
535 struct scsi_cmnd *sc = io_req->sc_cmd;
536 struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
537 int bd_count;
538
539 if (scsi_sg_count(sc)) {
540 bd_count = qedf_map_sg(io_req);
541 if (bd_count == 0)
542 return -ENOMEM;
543 } else {
544 bd_count = 0;
545 bd[0].sge_addr.lo = bd[0].sge_addr.hi = 0;
546 bd[0].sge_len = 0;
547 }
548 io_req->bd_tbl->bd_valid = bd_count;
549
550 return 0;
551 }
552
553 static void qedf_build_fcp_cmnd(struct qedf_ioreq *io_req,
554 struct fcp_cmnd *fcp_cmnd)
555 {
556 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
557
558 /* fcp_cmnd is 32 bytes */
559 memset(fcp_cmnd, 0, FCP_CMND_LEN);
560
561 /* 8 bytes: SCSI LUN info */
562 int_to_scsilun(sc_cmd->device->lun,
563 (struct scsi_lun *)&fcp_cmnd->fc_lun);
564
565 /* 4 bytes: flag info */
566 fcp_cmnd->fc_pri_ta = 0;
567 fcp_cmnd->fc_tm_flags = io_req->tm_flags;
568 fcp_cmnd->fc_flags = io_req->io_req_flags;
569 fcp_cmnd->fc_cmdref = 0;
570
571 /* Populate data direction */
572 if (io_req->cmd_type == QEDF_TASK_MGMT_CMD) {
573 fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
574 } else {
575 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE)
576 fcp_cmnd->fc_flags |= FCP_CFL_WRDATA;
577 else if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE)
578 fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
579 }
580
581 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
582
583 /* 16 bytes: CDB information */
584 if (io_req->cmd_type != QEDF_TASK_MGMT_CMD)
585 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
586
587 /* 4 bytes: FCP data length */
588 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
589 }
590
591 static void qedf_init_task(struct qedf_rport *fcport, struct fc_lport *lport,
592 struct qedf_ioreq *io_req, struct e4_fcoe_task_context *task_ctx,
593 struct fcoe_wqe *sqe)
594 {
595 enum fcoe_task_type task_type;
596 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
597 struct io_bdt *bd_tbl = io_req->bd_tbl;
598 u8 fcp_cmnd[32];
599 u32 tmp_fcp_cmnd[8];
600 int bd_count = 0;
601 struct qedf_ctx *qedf = fcport->qedf;
602 uint16_t cq_idx = smp_processor_id() % qedf->num_queues;
603 struct regpair sense_data_buffer_phys_addr;
604 u32 tx_io_size = 0;
605 u32 rx_io_size = 0;
606 int i, cnt;
607
608 /* Note init_initiator_rw_fcoe_task memsets the task context */
609 io_req->task = task_ctx;
610 memset(task_ctx, 0, sizeof(struct e4_fcoe_task_context));
611 memset(io_req->task_params, 0, sizeof(struct fcoe_task_params));
612 memset(io_req->sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
613
614 /* Set task type bassed on DMA directio of command */
615 if (io_req->cmd_type == QEDF_TASK_MGMT_CMD) {
616 task_type = FCOE_TASK_TYPE_READ_INITIATOR;
617 } else {
618 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
619 task_type = FCOE_TASK_TYPE_WRITE_INITIATOR;
620 tx_io_size = io_req->data_xfer_len;
621 } else {
622 task_type = FCOE_TASK_TYPE_READ_INITIATOR;
623 rx_io_size = io_req->data_xfer_len;
624 }
625 }
626
627 /* Setup the fields for fcoe_task_params */
628 io_req->task_params->context = task_ctx;
629 io_req->task_params->sqe = sqe;
630 io_req->task_params->task_type = task_type;
631 io_req->task_params->tx_io_size = tx_io_size;
632 io_req->task_params->rx_io_size = rx_io_size;
633 io_req->task_params->conn_cid = fcport->fw_cid;
634 io_req->task_params->itid = io_req->xid;
635 io_req->task_params->cq_rss_number = cq_idx;
636 io_req->task_params->is_tape_device = fcport->dev_type;
637
638 /* Fill in information for scatter/gather list */
639 if (io_req->cmd_type != QEDF_TASK_MGMT_CMD) {
640 bd_count = bd_tbl->bd_valid;
641 io_req->sgl_task_params->sgl = bd_tbl->bd_tbl;
642 io_req->sgl_task_params->sgl_phys_addr.lo =
643 U64_LO(bd_tbl->bd_tbl_dma);
644 io_req->sgl_task_params->sgl_phys_addr.hi =
645 U64_HI(bd_tbl->bd_tbl_dma);
646 io_req->sgl_task_params->num_sges = bd_count;
647 io_req->sgl_task_params->total_buffer_size =
648 scsi_bufflen(io_req->sc_cmd);
649 if (io_req->sge_type == QEDF_IOREQ_SLOW_SGE)
650 io_req->sgl_task_params->small_mid_sge = 1;
651 else
652 io_req->sgl_task_params->small_mid_sge = 0;
653 }
654
655 /* Fill in physical address of sense buffer */
656 sense_data_buffer_phys_addr.lo = U64_LO(io_req->sense_buffer_dma);
657 sense_data_buffer_phys_addr.hi = U64_HI(io_req->sense_buffer_dma);
658
659 /* fill FCP_CMND IU */
660 qedf_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tmp_fcp_cmnd);
661
662 /* Swap fcp_cmnd since FC is big endian */
663 cnt = sizeof(struct fcp_cmnd) / sizeof(u32);
664 for (i = 0; i < cnt; i++) {
665 tmp_fcp_cmnd[i] = cpu_to_be32(tmp_fcp_cmnd[i]);
666 }
667 memcpy(fcp_cmnd, tmp_fcp_cmnd, sizeof(struct fcp_cmnd));
668
669 init_initiator_rw_fcoe_task(io_req->task_params,
670 io_req->sgl_task_params,
671 sense_data_buffer_phys_addr,
672 io_req->task_retry_identifier, fcp_cmnd);
673
674 /* Increment SGL type counters */
675 if (io_req->sge_type == QEDF_IOREQ_SLOW_SGE)
676 qedf->slow_sge_ios++;
677 else
678 qedf->fast_sge_ios++;
679 }
680
681 void qedf_init_mp_task(struct qedf_ioreq *io_req,
682 struct e4_fcoe_task_context *task_ctx, struct fcoe_wqe *sqe)
683 {
684 struct qedf_mp_req *mp_req = &(io_req->mp_req);
685 struct qedf_rport *fcport = io_req->fcport;
686 struct qedf_ctx *qedf = io_req->fcport->qedf;
687 struct fc_frame_header *fc_hdr;
688 struct fcoe_tx_mid_path_params task_fc_hdr;
689 struct scsi_sgl_task_params tx_sgl_task_params;
690 struct scsi_sgl_task_params rx_sgl_task_params;
691
692 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
693 "Initializing MP task for cmd_type=%d\n",
694 io_req->cmd_type);
695
696 qedf->control_requests++;
697
698 memset(&tx_sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
699 memset(&rx_sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
700 memset(task_ctx, 0, sizeof(struct e4_fcoe_task_context));
701 memset(&task_fc_hdr, 0, sizeof(struct fcoe_tx_mid_path_params));
702
703 /* Setup the task from io_req for easy reference */
704 io_req->task = task_ctx;
705
706 /* Setup the fields for fcoe_task_params */
707 io_req->task_params->context = task_ctx;
708 io_req->task_params->sqe = sqe;
709 io_req->task_params->task_type = FCOE_TASK_TYPE_MIDPATH;
710 io_req->task_params->tx_io_size = io_req->data_xfer_len;
711 /* rx_io_size tells the f/w how large a response buffer we have */
712 io_req->task_params->rx_io_size = PAGE_SIZE;
713 io_req->task_params->conn_cid = fcport->fw_cid;
714 io_req->task_params->itid = io_req->xid;
715 /* Return middle path commands on CQ 0 */
716 io_req->task_params->cq_rss_number = 0;
717 io_req->task_params->is_tape_device = fcport->dev_type;
718
719 fc_hdr = &(mp_req->req_fc_hdr);
720 /* Set OX_ID and RX_ID based on driver task id */
721 fc_hdr->fh_ox_id = io_req->xid;
722 fc_hdr->fh_rx_id = htons(0xffff);
723
724 /* Set up FC header information */
725 task_fc_hdr.parameter = fc_hdr->fh_parm_offset;
726 task_fc_hdr.r_ctl = fc_hdr->fh_r_ctl;
727 task_fc_hdr.type = fc_hdr->fh_type;
728 task_fc_hdr.cs_ctl = fc_hdr->fh_cs_ctl;
729 task_fc_hdr.df_ctl = fc_hdr->fh_df_ctl;
730 task_fc_hdr.rx_id = fc_hdr->fh_rx_id;
731 task_fc_hdr.ox_id = fc_hdr->fh_ox_id;
732
733 /* Set up s/g list parameters for request buffer */
734 tx_sgl_task_params.sgl = mp_req->mp_req_bd;
735 tx_sgl_task_params.sgl_phys_addr.lo = U64_LO(mp_req->mp_req_bd_dma);
736 tx_sgl_task_params.sgl_phys_addr.hi = U64_HI(mp_req->mp_req_bd_dma);
737 tx_sgl_task_params.num_sges = 1;
738 /* Set PAGE_SIZE for now since sg element is that size ??? */
739 tx_sgl_task_params.total_buffer_size = io_req->data_xfer_len;
740 tx_sgl_task_params.small_mid_sge = 0;
741
742 /* Set up s/g list parameters for request buffer */
743 rx_sgl_task_params.sgl = mp_req->mp_resp_bd;
744 rx_sgl_task_params.sgl_phys_addr.lo = U64_LO(mp_req->mp_resp_bd_dma);
745 rx_sgl_task_params.sgl_phys_addr.hi = U64_HI(mp_req->mp_resp_bd_dma);
746 rx_sgl_task_params.num_sges = 1;
747 /* Set PAGE_SIZE for now since sg element is that size ??? */
748 rx_sgl_task_params.total_buffer_size = PAGE_SIZE;
749 rx_sgl_task_params.small_mid_sge = 0;
750
751
752 /*
753 * Last arg is 0 as previous code did not set that we wanted the
754 * fc header information.
755 */
756 init_initiator_midpath_unsolicited_fcoe_task(io_req->task_params,
757 &task_fc_hdr,
758 &tx_sgl_task_params,
759 &rx_sgl_task_params, 0);
760 }
761
762 /* Presumed that fcport->rport_lock is held */
763 u16 qedf_get_sqe_idx(struct qedf_rport *fcport)
764 {
765 uint16_t total_sqe = (fcport->sq_mem_size)/(sizeof(struct fcoe_wqe));
766 u16 rval;
767
768 rval = fcport->sq_prod_idx;
769
770 /* Adjust ring index */
771 fcport->sq_prod_idx++;
772 fcport->fw_sq_prod_idx++;
773 if (fcport->sq_prod_idx == total_sqe)
774 fcport->sq_prod_idx = 0;
775
776 return rval;
777 }
778
779 void qedf_ring_doorbell(struct qedf_rport *fcport)
780 {
781 struct fcoe_db_data dbell = { 0 };
782
783 dbell.agg_flags = 0;
784
785 dbell.params |= DB_DEST_XCM << FCOE_DB_DATA_DEST_SHIFT;
786 dbell.params |= DB_AGG_CMD_SET << FCOE_DB_DATA_AGG_CMD_SHIFT;
787 dbell.params |= DQ_XCM_FCOE_SQ_PROD_CMD <<
788 FCOE_DB_DATA_AGG_VAL_SEL_SHIFT;
789
790 dbell.sq_prod = fcport->fw_sq_prod_idx;
791 /* wmb makes sure that the BDs data is updated before updating the
792 * producer, otherwise FW may read old data from the BDs.
793 */
794 wmb();
795 barrier();
796 writel(*(u32 *)&dbell, fcport->p_doorbell);
797 /*
798 * Fence required to flush the write combined buffer, since another
799 * CPU may write to the same doorbell address and data may be lost
800 * due to relaxed order nature of write combined bar.
801 */
802 wmb();
803 }
804
805 static void qedf_trace_io(struct qedf_rport *fcport, struct qedf_ioreq *io_req,
806 int8_t direction)
807 {
808 struct qedf_ctx *qedf = fcport->qedf;
809 struct qedf_io_log *io_log;
810 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
811 unsigned long flags;
812 uint8_t op;
813
814 spin_lock_irqsave(&qedf->io_trace_lock, flags);
815
816 io_log = &qedf->io_trace_buf[qedf->io_trace_idx];
817 io_log->direction = direction;
818 io_log->task_id = io_req->xid;
819 io_log->port_id = fcport->rdata->ids.port_id;
820 io_log->lun = sc_cmd->device->lun;
821 io_log->op = op = sc_cmd->cmnd[0];
822 io_log->lba[0] = sc_cmd->cmnd[2];
823 io_log->lba[1] = sc_cmd->cmnd[3];
824 io_log->lba[2] = sc_cmd->cmnd[4];
825 io_log->lba[3] = sc_cmd->cmnd[5];
826 io_log->bufflen = scsi_bufflen(sc_cmd);
827 io_log->sg_count = scsi_sg_count(sc_cmd);
828 io_log->result = sc_cmd->result;
829 io_log->jiffies = jiffies;
830 io_log->refcount = kref_read(&io_req->refcount);
831
832 if (direction == QEDF_IO_TRACE_REQ) {
833 /* For requests we only care abot the submission CPU */
834 io_log->req_cpu = io_req->cpu;
835 io_log->int_cpu = 0;
836 io_log->rsp_cpu = 0;
837 } else if (direction == QEDF_IO_TRACE_RSP) {
838 io_log->req_cpu = io_req->cpu;
839 io_log->int_cpu = io_req->int_cpu;
840 io_log->rsp_cpu = smp_processor_id();
841 }
842
843 io_log->sge_type = io_req->sge_type;
844
845 qedf->io_trace_idx++;
846 if (qedf->io_trace_idx == QEDF_IO_TRACE_SIZE)
847 qedf->io_trace_idx = 0;
848
849 spin_unlock_irqrestore(&qedf->io_trace_lock, flags);
850 }
851
852 int qedf_post_io_req(struct qedf_rport *fcport, struct qedf_ioreq *io_req)
853 {
854 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
855 struct Scsi_Host *host = sc_cmd->device->host;
856 struct fc_lport *lport = shost_priv(host);
857 struct qedf_ctx *qedf = lport_priv(lport);
858 struct e4_fcoe_task_context *task_ctx;
859 u16 xid;
860 struct fcoe_wqe *sqe;
861 u16 sqe_idx;
862
863 /* Initialize rest of io_req fileds */
864 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
865 sc_cmd->SCp.ptr = (char *)io_req;
866 io_req->sge_type = QEDF_IOREQ_FAST_SGE; /* Assume fast SGL by default */
867
868 /* Record which cpu this request is associated with */
869 io_req->cpu = smp_processor_id();
870
871 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
872 io_req->io_req_flags = QEDF_READ;
873 qedf->input_requests++;
874 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
875 io_req->io_req_flags = QEDF_WRITE;
876 qedf->output_requests++;
877 } else {
878 io_req->io_req_flags = 0;
879 qedf->control_requests++;
880 }
881
882 xid = io_req->xid;
883
884 /* Build buffer descriptor list for firmware from sg list */
885 if (qedf_build_bd_list_from_sg(io_req)) {
886 QEDF_ERR(&(qedf->dbg_ctx), "BD list creation failed.\n");
887 /* Release cmd will release io_req, but sc_cmd is assigned */
888 io_req->sc_cmd = NULL;
889 kref_put(&io_req->refcount, qedf_release_cmd);
890 return -EAGAIN;
891 }
892
893 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
894 test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
895 QEDF_ERR(&(qedf->dbg_ctx), "Session not offloaded yet.\n");
896 /* Release cmd will release io_req, but sc_cmd is assigned */
897 io_req->sc_cmd = NULL;
898 kref_put(&io_req->refcount, qedf_release_cmd);
899 return -EINVAL;
900 }
901
902 /* Record LUN number for later use if we neeed them */
903 io_req->lun = (int)sc_cmd->device->lun;
904
905 /* Obtain free SQE */
906 sqe_idx = qedf_get_sqe_idx(fcport);
907 sqe = &fcport->sq[sqe_idx];
908 memset(sqe, 0, sizeof(struct fcoe_wqe));
909
910 /* Get the task context */
911 task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
912 if (!task_ctx) {
913 QEDF_WARN(&(qedf->dbg_ctx), "task_ctx is NULL, xid=%d.\n",
914 xid);
915 /* Release cmd will release io_req, but sc_cmd is assigned */
916 io_req->sc_cmd = NULL;
917 kref_put(&io_req->refcount, qedf_release_cmd);
918 return -EINVAL;
919 }
920
921 qedf_init_task(fcport, lport, io_req, task_ctx, sqe);
922
923 /* Ring doorbell */
924 qedf_ring_doorbell(fcport);
925
926 /* Set that command is with the firmware now */
927 set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
928
929 if (qedf_io_tracing && io_req->sc_cmd)
930 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_REQ);
931
932 return false;
933 }
934
935 int
936 qedf_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc_cmd)
937 {
938 struct fc_lport *lport = shost_priv(host);
939 struct qedf_ctx *qedf = lport_priv(lport);
940 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
941 struct fc_rport_libfc_priv *rp = rport->dd_data;
942 struct qedf_rport *fcport;
943 struct qedf_ioreq *io_req;
944 int rc = 0;
945 int rval;
946 unsigned long flags = 0;
947 int num_sgs = 0;
948
949 num_sgs = scsi_sg_count(sc_cmd);
950 if (scsi_sg_count(sc_cmd) > QEDF_MAX_BDS_PER_CMD) {
951 QEDF_ERR(&qedf->dbg_ctx,
952 "Number of SG elements %d exceeds what hardware limitation of %d.\n",
953 num_sgs, QEDF_MAX_BDS_PER_CMD);
954 sc_cmd->result = DID_ERROR;
955 sc_cmd->scsi_done(sc_cmd);
956 return 0;
957 }
958
959 if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
960 test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
961 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
962 "Returning DNC as unloading or stop io, flags 0x%lx.\n",
963 qedf->flags);
964 sc_cmd->result = DID_NO_CONNECT << 16;
965 sc_cmd->scsi_done(sc_cmd);
966 return 0;
967 }
968
969 if (!qedf->pdev->msix_enabled) {
970 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
971 "Completing sc_cmd=%p DID_NO_CONNECT as MSI-X is not enabled.\n",
972 sc_cmd);
973 sc_cmd->result = DID_NO_CONNECT << 16;
974 sc_cmd->scsi_done(sc_cmd);
975 return 0;
976 }
977
978 rval = fc_remote_port_chkready(rport);
979 if (rval) {
980 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
981 "fc_remote_port_chkready failed=0x%x for port_id=0x%06x.\n",
982 rval, rport->port_id);
983 sc_cmd->result = rval;
984 sc_cmd->scsi_done(sc_cmd);
985 return 0;
986 }
987
988 /* Retry command if we are doing a qed drain operation */
989 if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
990 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Drain active.\n");
991 rc = SCSI_MLQUEUE_HOST_BUSY;
992 goto exit_qcmd;
993 }
994
995 if (lport->state != LPORT_ST_READY ||
996 atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
997 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Link down.\n");
998 rc = SCSI_MLQUEUE_HOST_BUSY;
999 goto exit_qcmd;
1000 }
1001
1002 /* rport and tgt are allocated together, so tgt should be non-NULL */
1003 fcport = (struct qedf_rport *)&rp[1];
1004
1005 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
1006 test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
1007 /*
1008 * Session is not offloaded yet. Let SCSI-ml retry
1009 * the command.
1010 */
1011 rc = SCSI_MLQUEUE_TARGET_BUSY;
1012 goto exit_qcmd;
1013 }
1014
1015 atomic_inc(&fcport->ios_to_queue);
1016
1017 if (fcport->retry_delay_timestamp) {
1018 /* Take fcport->rport_lock for resetting the delay_timestamp */
1019 spin_lock_irqsave(&fcport->rport_lock, flags);
1020 if (time_after(jiffies, fcport->retry_delay_timestamp)) {
1021 fcport->retry_delay_timestamp = 0;
1022 } else {
1023 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1024 /* If retry_delay timer is active, flow off the ML */
1025 rc = SCSI_MLQUEUE_TARGET_BUSY;
1026 atomic_dec(&fcport->ios_to_queue);
1027 goto exit_qcmd;
1028 }
1029 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1030 }
1031
1032 io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
1033 if (!io_req) {
1034 rc = SCSI_MLQUEUE_HOST_BUSY;
1035 atomic_dec(&fcport->ios_to_queue);
1036 goto exit_qcmd;
1037 }
1038
1039 io_req->sc_cmd = sc_cmd;
1040
1041 /* Take fcport->rport_lock for posting to fcport send queue */
1042 spin_lock_irqsave(&fcport->rport_lock, flags);
1043 if (qedf_post_io_req(fcport, io_req)) {
1044 QEDF_WARN(&(qedf->dbg_ctx), "Unable to post io_req\n");
1045 /* Return SQE to pool */
1046 atomic_inc(&fcport->free_sqes);
1047 rc = SCSI_MLQUEUE_HOST_BUSY;
1048 }
1049 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1050 atomic_dec(&fcport->ios_to_queue);
1051
1052 exit_qcmd:
1053 return rc;
1054 }
1055
1056 static void qedf_parse_fcp_rsp(struct qedf_ioreq *io_req,
1057 struct fcoe_cqe_rsp_info *fcp_rsp)
1058 {
1059 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1060 struct qedf_ctx *qedf = io_req->fcport->qedf;
1061 u8 rsp_flags = fcp_rsp->rsp_flags.flags;
1062 int fcp_sns_len = 0;
1063 int fcp_rsp_len = 0;
1064 uint8_t *rsp_info, *sense_data;
1065
1066 io_req->fcp_status = FC_GOOD;
1067 io_req->fcp_resid = 0;
1068 if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1069 FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1070 io_req->fcp_resid = fcp_rsp->fcp_resid;
1071
1072 io_req->scsi_comp_flags = rsp_flags;
1073 CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1074 fcp_rsp->scsi_status_code;
1075
1076 if (rsp_flags &
1077 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID)
1078 fcp_rsp_len = fcp_rsp->fcp_rsp_len;
1079
1080 if (rsp_flags &
1081 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID)
1082 fcp_sns_len = fcp_rsp->fcp_sns_len;
1083
1084 io_req->fcp_rsp_len = fcp_rsp_len;
1085 io_req->fcp_sns_len = fcp_sns_len;
1086 rsp_info = sense_data = io_req->sense_buffer;
1087
1088 /* fetch fcp_rsp_code */
1089 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1090 /* Only for task management function */
1091 io_req->fcp_rsp_code = rsp_info[3];
1092 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1093 "fcp_rsp_code = %d\n", io_req->fcp_rsp_code);
1094 /* Adjust sense-data location. */
1095 sense_data += fcp_rsp_len;
1096 }
1097
1098 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1099 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1100 "Truncating sense buffer\n");
1101 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1102 }
1103
1104 /* The sense buffer can be NULL for TMF commands */
1105 if (sc_cmd->sense_buffer) {
1106 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1107 if (fcp_sns_len)
1108 memcpy(sc_cmd->sense_buffer, sense_data,
1109 fcp_sns_len);
1110 }
1111 }
1112
1113 static void qedf_unmap_sg_list(struct qedf_ctx *qedf, struct qedf_ioreq *io_req)
1114 {
1115 struct scsi_cmnd *sc = io_req->sc_cmd;
1116
1117 if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1118 dma_unmap_sg(&qedf->pdev->dev, scsi_sglist(sc),
1119 scsi_sg_count(sc), sc->sc_data_direction);
1120 io_req->bd_tbl->bd_valid = 0;
1121 }
1122 }
1123
1124 void qedf_scsi_completion(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1125 struct qedf_ioreq *io_req)
1126 {
1127 struct scsi_cmnd *sc_cmd;
1128 struct fcoe_cqe_rsp_info *fcp_rsp;
1129 struct qedf_rport *fcport;
1130 int refcount;
1131 u16 scope, qualifier = 0;
1132 u8 fw_residual_flag = 0;
1133 unsigned long flags = 0;
1134 u16 chk_scope = 0;
1135
1136 if (!io_req)
1137 return;
1138 if (!cqe)
1139 return;
1140
1141 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1142 test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags) ||
1143 test_bit(QEDF_CMD_IN_ABORT, &io_req->flags)) {
1144 QEDF_ERR(&qedf->dbg_ctx,
1145 "io_req xid=0x%x already in cleanup or abort processing or already completed.\n",
1146 io_req->xid);
1147 return;
1148 }
1149
1150 sc_cmd = io_req->sc_cmd;
1151 fcp_rsp = &cqe->cqe_info.rsp_info;
1152
1153 if (!sc_cmd) {
1154 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1155 return;
1156 }
1157
1158 if (!sc_cmd->SCp.ptr) {
1159 QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
1160 "another context.\n");
1161 return;
1162 }
1163
1164 if (!sc_cmd->device) {
1165 QEDF_ERR(&qedf->dbg_ctx,
1166 "Device for sc_cmd %p is NULL.\n", sc_cmd);
1167 return;
1168 }
1169
1170 if (!sc_cmd->request) {
1171 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd->request is NULL, "
1172 "sc_cmd=%p.\n", sc_cmd);
1173 return;
1174 }
1175
1176 if (!sc_cmd->request->q) {
1177 QEDF_WARN(&(qedf->dbg_ctx), "request->q is NULL so request "
1178 "is not valid, sc_cmd=%p.\n", sc_cmd);
1179 return;
1180 }
1181
1182 fcport = io_req->fcport;
1183
1184 /*
1185 * When flush is active, let the cmds be completed from the cleanup
1186 * context
1187 */
1188 if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
1189 (test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags) &&
1190 sc_cmd->device->lun == (u64)fcport->lun_reset_lun)) {
1191 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1192 "Dropping good completion xid=0x%x as fcport is flushing",
1193 io_req->xid);
1194 return;
1195 }
1196
1197 qedf_parse_fcp_rsp(io_req, fcp_rsp);
1198
1199 qedf_unmap_sg_list(qedf, io_req);
1200
1201 /* Check for FCP transport error */
1202 if (io_req->fcp_rsp_len > 3 && io_req->fcp_rsp_code) {
1203 QEDF_ERR(&(qedf->dbg_ctx),
1204 "FCP I/O protocol failure xid=0x%x fcp_rsp_len=%d "
1205 "fcp_rsp_code=%d.\n", io_req->xid, io_req->fcp_rsp_len,
1206 io_req->fcp_rsp_code);
1207 sc_cmd->result = DID_BUS_BUSY << 16;
1208 goto out;
1209 }
1210
1211 fw_residual_flag = GET_FIELD(cqe->cqe_info.rsp_info.fw_error_flags,
1212 FCOE_CQE_RSP_INFO_FW_UNDERRUN);
1213 if (fw_residual_flag) {
1214 QEDF_ERR(&qedf->dbg_ctx,
1215 "Firmware detected underrun: xid=0x%x fcp_rsp.flags=0x%02x fcp_resid=%d fw_residual=0x%x lba=%02x%02x%02x%02x.\n",
1216 io_req->xid, fcp_rsp->rsp_flags.flags,
1217 io_req->fcp_resid,
1218 cqe->cqe_info.rsp_info.fw_residual, sc_cmd->cmnd[2],
1219 sc_cmd->cmnd[3], sc_cmd->cmnd[4], sc_cmd->cmnd[5]);
1220
1221 if (io_req->cdb_status == 0)
1222 sc_cmd->result = (DID_ERROR << 16) | io_req->cdb_status;
1223 else
1224 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1225
1226 /*
1227 * Set resid to the whole buffer length so we won't try to resue
1228 * any previously data.
1229 */
1230 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1231 goto out;
1232 }
1233
1234 switch (io_req->fcp_status) {
1235 case FC_GOOD:
1236 if (io_req->cdb_status == 0) {
1237 /* Good I/O completion */
1238 sc_cmd->result = DID_OK << 16;
1239 } else {
1240 refcount = kref_read(&io_req->refcount);
1241 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1242 "%d:0:%d:%lld xid=0x%0x op=0x%02x "
1243 "lba=%02x%02x%02x%02x cdb_status=%d "
1244 "fcp_resid=0x%x refcount=%d.\n",
1245 qedf->lport->host->host_no, sc_cmd->device->id,
1246 sc_cmd->device->lun, io_req->xid,
1247 sc_cmd->cmnd[0], sc_cmd->cmnd[2], sc_cmd->cmnd[3],
1248 sc_cmd->cmnd[4], sc_cmd->cmnd[5],
1249 io_req->cdb_status, io_req->fcp_resid,
1250 refcount);
1251 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1252
1253 if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1254 io_req->cdb_status == SAM_STAT_BUSY) {
1255 /*
1256 * Check whether we need to set retry_delay at
1257 * all based on retry_delay module parameter
1258 * and the status qualifier.
1259 */
1260
1261 /* Upper 2 bits */
1262 scope = fcp_rsp->retry_delay_timer & 0xC000;
1263 /* Lower 14 bits */
1264 qualifier = fcp_rsp->retry_delay_timer & 0x3FFF;
1265
1266 if (qedf_retry_delay)
1267 chk_scope = 1;
1268 /* Record stats */
1269 if (io_req->cdb_status ==
1270 SAM_STAT_TASK_SET_FULL)
1271 qedf->task_set_fulls++;
1272 else
1273 qedf->busy++;
1274 }
1275 }
1276 if (io_req->fcp_resid)
1277 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1278
1279 if (chk_scope == 1) {
1280 if ((scope == 1 || scope == 2) &&
1281 (qualifier > 0 && qualifier <= 0x3FEF)) {
1282 /* Check we don't go over the max */
1283 if (qualifier > QEDF_RETRY_DELAY_MAX) {
1284 qualifier = QEDF_RETRY_DELAY_MAX;
1285 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1286 "qualifier = %d\n",
1287 (fcp_rsp->retry_delay_timer &
1288 0x3FFF));
1289 }
1290 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1291 "Scope = %d and qualifier = %d",
1292 scope, qualifier);
1293 /* Take fcport->rport_lock to
1294 * update the retry_delay_timestamp
1295 */
1296 spin_lock_irqsave(&fcport->rport_lock, flags);
1297 fcport->retry_delay_timestamp =
1298 jiffies + (qualifier * HZ / 10);
1299 spin_unlock_irqrestore(&fcport->rport_lock,
1300 flags);
1301
1302 } else {
1303 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1304 "combination of scope = %d and qualifier = %d is not handled in qedf.\n",
1305 scope, qualifier);
1306 }
1307 }
1308 break;
1309 default:
1310 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "fcp_status=%d.\n",
1311 io_req->fcp_status);
1312 break;
1313 }
1314
1315 out:
1316 if (qedf_io_tracing)
1317 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_RSP);
1318
1319 /*
1320 * We wait till the end of the function to clear the
1321 * outstanding bit in case we need to send an abort
1322 */
1323 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
1324
1325 io_req->sc_cmd = NULL;
1326 sc_cmd->SCp.ptr = NULL;
1327 sc_cmd->scsi_done(sc_cmd);
1328 kref_put(&io_req->refcount, qedf_release_cmd);
1329 }
1330
1331 /* Return a SCSI command in some other context besides a normal completion */
1332 void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
1333 int result)
1334 {
1335 struct scsi_cmnd *sc_cmd;
1336 int refcount;
1337
1338 if (!io_req) {
1339 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "io_req is NULL\n");
1340 return;
1341 }
1342
1343 if (test_and_set_bit(QEDF_CMD_ERR_SCSI_DONE, &io_req->flags)) {
1344 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1345 "io_req:%p scsi_done handling already done\n",
1346 io_req);
1347 return;
1348 }
1349
1350 /*
1351 * We will be done with this command after this call so clear the
1352 * outstanding bit.
1353 */
1354 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
1355
1356 sc_cmd = io_req->sc_cmd;
1357
1358 if (!sc_cmd) {
1359 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1360 return;
1361 }
1362
1363 if (!virt_addr_valid(sc_cmd)) {
1364 QEDF_ERR(&qedf->dbg_ctx, "sc_cmd=%p is not valid.", sc_cmd);
1365 goto bad_scsi_ptr;
1366 }
1367
1368 if (!sc_cmd->SCp.ptr) {
1369 QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
1370 "another context.\n");
1371 return;
1372 }
1373
1374 if (!sc_cmd->device) {
1375 QEDF_ERR(&qedf->dbg_ctx, "Device for sc_cmd %p is NULL.\n",
1376 sc_cmd);
1377 goto bad_scsi_ptr;
1378 }
1379
1380 if (!virt_addr_valid(sc_cmd->device)) {
1381 QEDF_ERR(&qedf->dbg_ctx,
1382 "Device pointer for sc_cmd %p is bad.\n", sc_cmd);
1383 goto bad_scsi_ptr;
1384 }
1385
1386 if (!sc_cmd->sense_buffer) {
1387 QEDF_ERR(&qedf->dbg_ctx,
1388 "sc_cmd->sense_buffer for sc_cmd %p is NULL.\n",
1389 sc_cmd);
1390 goto bad_scsi_ptr;
1391 }
1392
1393 if (!virt_addr_valid(sc_cmd->sense_buffer)) {
1394 QEDF_ERR(&qedf->dbg_ctx,
1395 "sc_cmd->sense_buffer for sc_cmd %p is bad.\n",
1396 sc_cmd);
1397 goto bad_scsi_ptr;
1398 }
1399
1400 if (!sc_cmd->scsi_done) {
1401 QEDF_ERR(&qedf->dbg_ctx,
1402 "sc_cmd->scsi_done for sc_cmd %p is NULL.\n",
1403 sc_cmd);
1404 goto bad_scsi_ptr;
1405 }
1406
1407 qedf_unmap_sg_list(qedf, io_req);
1408
1409 sc_cmd->result = result << 16;
1410 refcount = kref_read(&io_req->refcount);
1411 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "%d:0:%d:%lld: Completing "
1412 "sc_cmd=%p result=0x%08x op=0x%02x lba=0x%02x%02x%02x%02x, "
1413 "allowed=%d retries=%d refcount=%d.\n",
1414 qedf->lport->host->host_no, sc_cmd->device->id,
1415 sc_cmd->device->lun, sc_cmd, sc_cmd->result, sc_cmd->cmnd[0],
1416 sc_cmd->cmnd[2], sc_cmd->cmnd[3], sc_cmd->cmnd[4],
1417 sc_cmd->cmnd[5], sc_cmd->allowed, sc_cmd->retries,
1418 refcount);
1419
1420 /*
1421 * Set resid to the whole buffer length so we won't try to resue any
1422 * previously read data
1423 */
1424 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1425
1426 if (qedf_io_tracing)
1427 qedf_trace_io(io_req->fcport, io_req, QEDF_IO_TRACE_RSP);
1428
1429 io_req->sc_cmd = NULL;
1430 sc_cmd->SCp.ptr = NULL;
1431 sc_cmd->scsi_done(sc_cmd);
1432 kref_put(&io_req->refcount, qedf_release_cmd);
1433 return;
1434
1435 bad_scsi_ptr:
1436 /*
1437 * Clear the io_req->sc_cmd backpointer so we don't try to process
1438 * this again
1439 */
1440 io_req->sc_cmd = NULL;
1441 kref_put(&io_req->refcount, qedf_release_cmd); /* ID: 001 */
1442 }
1443
1444 /*
1445 * Handle warning type CQE completions. This is mainly used for REC timer
1446 * popping.
1447 */
1448 void qedf_process_warning_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1449 struct qedf_ioreq *io_req)
1450 {
1451 int rval, i;
1452 struct qedf_rport *fcport = io_req->fcport;
1453 u64 err_warn_bit_map;
1454 u8 err_warn = 0xff;
1455
1456 if (!cqe) {
1457 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1458 "cqe is NULL for io_req %p xid=0x%x\n",
1459 io_req, io_req->xid);
1460 return;
1461 }
1462
1463 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Warning CQE, "
1464 "xid=0x%x\n", io_req->xid);
1465 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1466 "err_warn_bitmap=%08x:%08x\n",
1467 le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1468 le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1469 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1470 "rx_buff_off=%08x, rx_id=%04x\n",
1471 le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1472 le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1473 le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1474
1475 /* Normalize the error bitmap value to an just an unsigned int */
1476 err_warn_bit_map = (u64)
1477 ((u64)cqe->cqe_info.err_info.err_warn_bitmap_hi << 32) |
1478 (u64)cqe->cqe_info.err_info.err_warn_bitmap_lo;
1479 for (i = 0; i < 64; i++) {
1480 if (err_warn_bit_map & (u64)((u64)1 << i)) {
1481 err_warn = i;
1482 break;
1483 }
1484 }
1485
1486 /* Check if REC TOV expired if this is a tape device */
1487 if (fcport->dev_type == QEDF_RPORT_TYPE_TAPE) {
1488 if (err_warn ==
1489 FCOE_WARNING_CODE_REC_TOV_TIMER_EXPIRATION) {
1490 QEDF_ERR(&(qedf->dbg_ctx), "REC timer expired.\n");
1491 if (!test_bit(QEDF_CMD_SRR_SENT, &io_req->flags)) {
1492 io_req->rx_buf_off =
1493 cqe->cqe_info.err_info.rx_buf_off;
1494 io_req->tx_buf_off =
1495 cqe->cqe_info.err_info.tx_buf_off;
1496 io_req->rx_id = cqe->cqe_info.err_info.rx_id;
1497 rval = qedf_send_rec(io_req);
1498 /*
1499 * We only want to abort the io_req if we
1500 * can't queue the REC command as we want to
1501 * keep the exchange open for recovery.
1502 */
1503 if (rval)
1504 goto send_abort;
1505 }
1506 return;
1507 }
1508 }
1509
1510 send_abort:
1511 init_completion(&io_req->abts_done);
1512 rval = qedf_initiate_abts(io_req, true);
1513 if (rval)
1514 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1515 }
1516
1517 /* Cleanup a command when we receive an error detection completion */
1518 void qedf_process_error_detect(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1519 struct qedf_ioreq *io_req)
1520 {
1521 int rval;
1522
1523 if (!cqe) {
1524 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1525 "cqe is NULL for io_req %p\n", io_req);
1526 return;
1527 }
1528
1529 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Error detection CQE, "
1530 "xid=0x%x\n", io_req->xid);
1531 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1532 "err_warn_bitmap=%08x:%08x\n",
1533 le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1534 le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1535 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1536 "rx_buff_off=%08x, rx_id=%04x\n",
1537 le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1538 le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1539 le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1540
1541 if (qedf->stop_io_on_error) {
1542 qedf_stop_all_io(qedf);
1543 return;
1544 }
1545
1546 init_completion(&io_req->abts_done);
1547 rval = qedf_initiate_abts(io_req, true);
1548 if (rval)
1549 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1550 }
1551
1552 static void qedf_flush_els_req(struct qedf_ctx *qedf,
1553 struct qedf_ioreq *els_req)
1554 {
1555 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1556 "Flushing ELS request xid=0x%x refcount=%d.\n", els_req->xid,
1557 kref_read(&els_req->refcount));
1558
1559 /*
1560 * Need to distinguish this from a timeout when calling the
1561 * els_req->cb_func.
1562 */
1563 els_req->event = QEDF_IOREQ_EV_ELS_FLUSH;
1564
1565 clear_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
1566
1567 /* Cancel the timer */
1568 cancel_delayed_work_sync(&els_req->timeout_work);
1569
1570 /* Call callback function to complete command */
1571 if (els_req->cb_func && els_req->cb_arg) {
1572 els_req->cb_func(els_req->cb_arg);
1573 els_req->cb_arg = NULL;
1574 }
1575
1576 /* Release kref for original initiate_els */
1577 kref_put(&els_req->refcount, qedf_release_cmd);
1578 }
1579
1580 /* A value of -1 for lun is a wild card that means flush all
1581 * active SCSI I/Os for the target.
1582 */
1583 void qedf_flush_active_ios(struct qedf_rport *fcport, int lun)
1584 {
1585 struct qedf_ioreq *io_req;
1586 struct qedf_ctx *qedf;
1587 struct qedf_cmd_mgr *cmd_mgr;
1588 int i, rc;
1589 unsigned long flags;
1590 int flush_cnt = 0;
1591 int wait_cnt = 100;
1592 int refcount = 0;
1593
1594 if (!fcport) {
1595 QEDF_ERR(NULL, "fcport is NULL\n");
1596 return;
1597 }
1598
1599 /* Check that fcport is still offloaded */
1600 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1601 QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
1602 return;
1603 }
1604
1605 qedf = fcport->qedf;
1606
1607 if (!qedf) {
1608 QEDF_ERR(NULL, "qedf is NULL.\n");
1609 return;
1610 }
1611
1612 /* Only wait for all commands to be queued in the Upload context */
1613 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags) &&
1614 (lun == -1)) {
1615 while (atomic_read(&fcport->ios_to_queue)) {
1616 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1617 "Waiting for %d I/Os to be queued\n",
1618 atomic_read(&fcport->ios_to_queue));
1619 if (wait_cnt == 0) {
1620 QEDF_ERR(NULL,
1621 "%d IOs request could not be queued\n",
1622 atomic_read(&fcport->ios_to_queue));
1623 }
1624 msleep(20);
1625 wait_cnt--;
1626 }
1627 }
1628
1629 cmd_mgr = qedf->cmd_mgr;
1630
1631 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1632 "Flush active i/o's num=0x%x fcport=0x%p port_id=0x%06x scsi_id=%d.\n",
1633 atomic_read(&fcport->num_active_ios), fcport,
1634 fcport->rdata->ids.port_id, fcport->rport->scsi_target_id);
1635 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Locking flush mutex.\n");
1636
1637 mutex_lock(&qedf->flush_mutex);
1638 if (lun == -1) {
1639 set_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags);
1640 } else {
1641 set_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags);
1642 fcport->lun_reset_lun = lun;
1643 }
1644
1645 for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1646 io_req = &cmd_mgr->cmds[i];
1647
1648 if (!io_req)
1649 continue;
1650 if (!io_req->fcport)
1651 continue;
1652
1653 spin_lock_irqsave(&cmd_mgr->lock, flags);
1654
1655 if (io_req->alloc) {
1656 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags)) {
1657 if (io_req->cmd_type == QEDF_SCSI_CMD)
1658 QEDF_ERR(&qedf->dbg_ctx,
1659 "Allocated but not queued, xid=0x%x\n",
1660 io_req->xid);
1661 }
1662 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
1663 } else {
1664 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
1665 continue;
1666 }
1667
1668 if (io_req->fcport != fcport)
1669 continue;
1670
1671 /* In case of ABTS, CMD_OUTSTANDING is cleared on ABTS response,
1672 * but RRQ is still pending.
1673 * Workaround: Within qedf_send_rrq, we check if the fcport is
1674 * NULL, and we drop the ref on the io_req to clean it up.
1675 */
1676 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags)) {
1677 refcount = kref_read(&io_req->refcount);
1678 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1679 "Not outstanding, xid=0x%x, cmd_type=%d refcount=%d.\n",
1680 io_req->xid, io_req->cmd_type, refcount);
1681 /* If RRQ work has been queue, try to cancel it and
1682 * free the io_req
1683 */
1684 if (atomic_read(&io_req->state) ==
1685 QEDFC_CMD_ST_RRQ_WAIT) {
1686 if (cancel_delayed_work_sync
1687 (&io_req->rrq_work)) {
1688 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1689 "Putting reference for pending RRQ work xid=0x%x.\n",
1690 io_req->xid);
1691 /* ID: 003 */
1692 kref_put(&io_req->refcount,
1693 qedf_release_cmd);
1694 }
1695 }
1696 continue;
1697 }
1698
1699 /* Only consider flushing ELS during target reset */
1700 if (io_req->cmd_type == QEDF_ELS &&
1701 lun == -1) {
1702 rc = kref_get_unless_zero(&io_req->refcount);
1703 if (!rc) {
1704 QEDF_ERR(&(qedf->dbg_ctx),
1705 "Could not get kref for ELS io_req=0x%p xid=0x%x.\n",
1706 io_req, io_req->xid);
1707 continue;
1708 }
1709 qedf_initiate_cleanup(io_req, false);
1710 flush_cnt++;
1711 qedf_flush_els_req(qedf, io_req);
1712
1713 /*
1714 * Release the kref and go back to the top of the
1715 * loop.
1716 */
1717 goto free_cmd;
1718 }
1719
1720 if (io_req->cmd_type == QEDF_ABTS) {
1721 /* ID: 004 */
1722 rc = kref_get_unless_zero(&io_req->refcount);
1723 if (!rc) {
1724 QEDF_ERR(&(qedf->dbg_ctx),
1725 "Could not get kref for abort io_req=0x%p xid=0x%x.\n",
1726 io_req, io_req->xid);
1727 continue;
1728 }
1729 if (lun != -1 && io_req->lun != lun)
1730 goto free_cmd;
1731
1732 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1733 "Flushing abort xid=0x%x.\n", io_req->xid);
1734
1735 if (cancel_delayed_work_sync(&io_req->rrq_work)) {
1736 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1737 "Putting ref for cancelled RRQ work xid=0x%x.\n",
1738 io_req->xid);
1739 kref_put(&io_req->refcount, qedf_release_cmd);
1740 }
1741
1742 if (cancel_delayed_work_sync(&io_req->timeout_work)) {
1743 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1744 "Putting ref for cancelled tmo work xid=0x%x.\n",
1745 io_req->xid);
1746 qedf_initiate_cleanup(io_req, true);
1747 /* Notify eh_abort handler that ABTS is
1748 * complete
1749 */
1750 complete(&io_req->abts_done);
1751 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1752 /* ID: 002 */
1753 kref_put(&io_req->refcount, qedf_release_cmd);
1754 }
1755 flush_cnt++;
1756 goto free_cmd;
1757 }
1758
1759 if (!io_req->sc_cmd)
1760 continue;
1761 if (!io_req->sc_cmd->device) {
1762 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1763 "Device backpointer NULL for sc_cmd=%p.\n",
1764 io_req->sc_cmd);
1765 /* Put reference for non-existent scsi_cmnd */
1766 io_req->sc_cmd = NULL;
1767 qedf_initiate_cleanup(io_req, false);
1768 kref_put(&io_req->refcount, qedf_release_cmd);
1769 continue;
1770 }
1771 if (lun > -1) {
1772 if (io_req->lun != lun)
1773 continue;
1774 }
1775
1776 /*
1777 * Use kref_get_unless_zero in the unlikely case the command
1778 * we're about to flush was completed in the normal SCSI path
1779 */
1780 rc = kref_get_unless_zero(&io_req->refcount);
1781 if (!rc) {
1782 QEDF_ERR(&(qedf->dbg_ctx), "Could not get kref for "
1783 "io_req=0x%p xid=0x%x\n", io_req, io_req->xid);
1784 continue;
1785 }
1786
1787 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1788 "Cleanup xid=0x%x.\n", io_req->xid);
1789 flush_cnt++;
1790
1791 /* Cleanup task and return I/O mid-layer */
1792 qedf_initiate_cleanup(io_req, true);
1793
1794 free_cmd:
1795 kref_put(&io_req->refcount, qedf_release_cmd); /* ID: 004 */
1796 }
1797
1798 wait_cnt = 60;
1799 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1800 "Flushed 0x%x I/Os, active=0x%x.\n",
1801 flush_cnt, atomic_read(&fcport->num_active_ios));
1802 /* Only wait for all commands to complete in the Upload context */
1803 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags) &&
1804 (lun == -1)) {
1805 while (atomic_read(&fcport->num_active_ios)) {
1806 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1807 "Flushed 0x%x I/Os, active=0x%x cnt=%d.\n",
1808 flush_cnt,
1809 atomic_read(&fcport->num_active_ios),
1810 wait_cnt);
1811 if (wait_cnt == 0) {
1812 QEDF_ERR(&qedf->dbg_ctx,
1813 "Flushed %d I/Os, active=%d.\n",
1814 flush_cnt,
1815 atomic_read(&fcport->num_active_ios));
1816 for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1817 io_req = &cmd_mgr->cmds[i];
1818 if (io_req->fcport &&
1819 io_req->fcport == fcport) {
1820 refcount =
1821 kref_read(&io_req->refcount);
1822 set_bit(QEDF_CMD_DIRTY,
1823 &io_req->flags);
1824 QEDF_ERR(&qedf->dbg_ctx,
1825 "Outstanding io_req =%p xid=0x%x flags=0x%lx, sc_cmd=%p refcount=%d cmd_type=%d.\n",
1826 io_req, io_req->xid,
1827 io_req->flags,
1828 io_req->sc_cmd,
1829 refcount,
1830 io_req->cmd_type);
1831 }
1832 }
1833 WARN_ON(1);
1834 break;
1835 }
1836 msleep(500);
1837 wait_cnt--;
1838 }
1839 }
1840
1841 clear_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags);
1842 clear_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags);
1843 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Unlocking flush mutex.\n");
1844 mutex_unlock(&qedf->flush_mutex);
1845 }
1846
1847 /*
1848 * Initiate a ABTS middle path command. Note that we don't have to initialize
1849 * the task context for an ABTS task.
1850 */
1851 int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
1852 {
1853 struct fc_lport *lport;
1854 struct qedf_rport *fcport = io_req->fcport;
1855 struct fc_rport_priv *rdata;
1856 struct qedf_ctx *qedf;
1857 u16 xid;
1858 int rc = 0;
1859 unsigned long flags;
1860 struct fcoe_wqe *sqe;
1861 u16 sqe_idx;
1862 int refcount = 0;
1863
1864 /* Sanity check qedf_rport before dereferencing any pointers */
1865 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1866 QEDF_ERR(NULL, "tgt not offloaded\n");
1867 rc = 1;
1868 goto out;
1869 }
1870
1871 qedf = fcport->qedf;
1872 rdata = fcport->rdata;
1873
1874 if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
1875 QEDF_ERR(&qedf->dbg_ctx, "stale rport\n");
1876 rc = 1;
1877 goto out;
1878 }
1879
1880 lport = qedf->lport;
1881
1882 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
1883 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
1884 rc = 1;
1885 goto drop_rdata_kref;
1886 }
1887
1888 if (atomic_read(&qedf->link_down_tmo_valid) > 0) {
1889 QEDF_ERR(&(qedf->dbg_ctx), "link_down_tmo active.\n");
1890 rc = 1;
1891 goto drop_rdata_kref;
1892 }
1893
1894 /* Ensure room on SQ */
1895 if (!atomic_read(&fcport->free_sqes)) {
1896 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
1897 rc = 1;
1898 goto drop_rdata_kref;
1899 }
1900
1901 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
1902 QEDF_ERR(&qedf->dbg_ctx, "fcport is uploading.\n");
1903 rc = 1;
1904 goto drop_rdata_kref;
1905 }
1906
1907 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1908 test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags) ||
1909 test_bit(QEDF_CMD_IN_ABORT, &io_req->flags)) {
1910 QEDF_ERR(&qedf->dbg_ctx,
1911 "io_req xid=0x%x sc_cmd=%p already in cleanup or abort processing or already completed.\n",
1912 io_req->xid, io_req->sc_cmd);
1913 rc = 1;
1914 goto drop_rdata_kref;
1915 }
1916
1917 kref_get(&io_req->refcount);
1918
1919 xid = io_req->xid;
1920 qedf->control_requests++;
1921 qedf->packet_aborts++;
1922
1923 /* Set the command type to abort */
1924 io_req->cmd_type = QEDF_ABTS;
1925 io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
1926
1927 set_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1928 refcount = kref_read(&io_req->refcount);
1929 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
1930 "ABTS io_req xid = 0x%x refcount=%d\n",
1931 xid, refcount);
1932
1933 qedf_cmd_timer_set(qedf, io_req, QEDF_ABORT_TIMEOUT);
1934
1935 spin_lock_irqsave(&fcport->rport_lock, flags);
1936
1937 sqe_idx = qedf_get_sqe_idx(fcport);
1938 sqe = &fcport->sq[sqe_idx];
1939 memset(sqe, 0, sizeof(struct fcoe_wqe));
1940 io_req->task_params->sqe = sqe;
1941
1942 init_initiator_abort_fcoe_task(io_req->task_params);
1943 qedf_ring_doorbell(fcport);
1944
1945 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1946
1947 drop_rdata_kref:
1948 kref_put(&rdata->kref, fc_rport_destroy);
1949 out:
1950 return rc;
1951 }
1952
1953 void qedf_process_abts_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1954 struct qedf_ioreq *io_req)
1955 {
1956 uint32_t r_ctl;
1957 int rc;
1958 struct qedf_rport *fcport = io_req->fcport;
1959
1960 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "Entered with xid = "
1961 "0x%x cmd_type = %d\n", io_req->xid, io_req->cmd_type);
1962
1963 r_ctl = cqe->cqe_info.abts_info.r_ctl;
1964
1965 /* This was added at a point when we were scheduling abts_compl &
1966 * cleanup_compl on different CPUs and there was a possibility of
1967 * the io_req to be freed from the other context before we got here.
1968 */
1969 if (!fcport) {
1970 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1971 "Dropping ABTS completion xid=0x%x as fcport is NULL",
1972 io_req->xid);
1973 return;
1974 }
1975
1976 /*
1977 * When flush is active, let the cmds be completed from the cleanup
1978 * context
1979 */
1980 if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
1981 test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags)) {
1982 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1983 "Dropping ABTS completion xid=0x%x as fcport is flushing",
1984 io_req->xid);
1985 return;
1986 }
1987
1988 if (!cancel_delayed_work(&io_req->timeout_work)) {
1989 QEDF_ERR(&qedf->dbg_ctx,
1990 "Wasn't able to cancel abts timeout work.\n");
1991 }
1992
1993 switch (r_ctl) {
1994 case FC_RCTL_BA_ACC:
1995 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
1996 "ABTS response - ACC Send RRQ after R_A_TOV\n");
1997 io_req->event = QEDF_IOREQ_EV_ABORT_SUCCESS;
1998 rc = kref_get_unless_zero(&io_req->refcount); /* ID: 003 */
1999 if (!rc) {
2000 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2001 "kref is already zero so ABTS was already completed or flushed xid=0x%x.\n",
2002 io_req->xid);
2003 return;
2004 }
2005 /*
2006 * Dont release this cmd yet. It will be relesed
2007 * after we get RRQ response
2008 */
2009 queue_delayed_work(qedf->dpc_wq, &io_req->rrq_work,
2010 msecs_to_jiffies(qedf->lport->r_a_tov));
2011 atomic_set(&io_req->state, QEDFC_CMD_ST_RRQ_WAIT);
2012 break;
2013 /* For error cases let the cleanup return the command */
2014 case FC_RCTL_BA_RJT:
2015 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
2016 "ABTS response - RJT\n");
2017 io_req->event = QEDF_IOREQ_EV_ABORT_FAILED;
2018 break;
2019 default:
2020 QEDF_ERR(&(qedf->dbg_ctx), "Unknown ABTS response\n");
2021 break;
2022 }
2023
2024 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
2025
2026 if (io_req->sc_cmd) {
2027 if (!io_req->return_scsi_cmd_on_abts)
2028 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2029 "Not call scsi_done for xid=0x%x.\n",
2030 io_req->xid);
2031 if (io_req->return_scsi_cmd_on_abts)
2032 qedf_scsi_done(qedf, io_req, DID_ERROR);
2033 }
2034
2035 /* Notify eh_abort handler that ABTS is complete */
2036 complete(&io_req->abts_done);
2037
2038 kref_put(&io_req->refcount, qedf_release_cmd);
2039 }
2040
2041 int qedf_init_mp_req(struct qedf_ioreq *io_req)
2042 {
2043 struct qedf_mp_req *mp_req;
2044 struct scsi_sge *mp_req_bd;
2045 struct scsi_sge *mp_resp_bd;
2046 struct qedf_ctx *qedf = io_req->fcport->qedf;
2047 dma_addr_t addr;
2048 uint64_t sz;
2049
2050 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_MP_REQ, "Entered.\n");
2051
2052 mp_req = (struct qedf_mp_req *)&(io_req->mp_req);
2053 memset(mp_req, 0, sizeof(struct qedf_mp_req));
2054
2055 if (io_req->cmd_type != QEDF_ELS) {
2056 mp_req->req_len = sizeof(struct fcp_cmnd);
2057 io_req->data_xfer_len = mp_req->req_len;
2058 } else
2059 mp_req->req_len = io_req->data_xfer_len;
2060
2061 mp_req->req_buf = dma_alloc_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
2062 &mp_req->req_buf_dma, GFP_KERNEL);
2063 if (!mp_req->req_buf) {
2064 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req buffer\n");
2065 qedf_free_mp_resc(io_req);
2066 return -ENOMEM;
2067 }
2068
2069 mp_req->resp_buf = dma_alloc_coherent(&qedf->pdev->dev,
2070 QEDF_PAGE_SIZE, &mp_req->resp_buf_dma, GFP_KERNEL);
2071 if (!mp_req->resp_buf) {
2072 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc TM resp "
2073 "buffer\n");
2074 qedf_free_mp_resc(io_req);
2075 return -ENOMEM;
2076 }
2077
2078 /* Allocate and map mp_req_bd and mp_resp_bd */
2079 sz = sizeof(struct scsi_sge);
2080 mp_req->mp_req_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
2081 &mp_req->mp_req_bd_dma, GFP_KERNEL);
2082 if (!mp_req->mp_req_bd) {
2083 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req bd\n");
2084 qedf_free_mp_resc(io_req);
2085 return -ENOMEM;
2086 }
2087
2088 mp_req->mp_resp_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
2089 &mp_req->mp_resp_bd_dma, GFP_KERNEL);
2090 if (!mp_req->mp_resp_bd) {
2091 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP resp bd\n");
2092 qedf_free_mp_resc(io_req);
2093 return -ENOMEM;
2094 }
2095
2096 /* Fill bd table */
2097 addr = mp_req->req_buf_dma;
2098 mp_req_bd = mp_req->mp_req_bd;
2099 mp_req_bd->sge_addr.lo = U64_LO(addr);
2100 mp_req_bd->sge_addr.hi = U64_HI(addr);
2101 mp_req_bd->sge_len = QEDF_PAGE_SIZE;
2102
2103 /*
2104 * MP buffer is either a task mgmt command or an ELS.
2105 * So the assumption is that it consumes a single bd
2106 * entry in the bd table
2107 */
2108 mp_resp_bd = mp_req->mp_resp_bd;
2109 addr = mp_req->resp_buf_dma;
2110 mp_resp_bd->sge_addr.lo = U64_LO(addr);
2111 mp_resp_bd->sge_addr.hi = U64_HI(addr);
2112 mp_resp_bd->sge_len = QEDF_PAGE_SIZE;
2113
2114 return 0;
2115 }
2116
2117 /*
2118 * Last ditch effort to clear the port if it's stuck. Used only after a
2119 * cleanup task times out.
2120 */
2121 static void qedf_drain_request(struct qedf_ctx *qedf)
2122 {
2123 if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
2124 QEDF_ERR(&(qedf->dbg_ctx), "MCP drain already active.\n");
2125 return;
2126 }
2127
2128 /* Set bit to return all queuecommand requests as busy */
2129 set_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
2130
2131 /* Call qed drain request for function. Should be synchronous */
2132 qed_ops->common->drain(qedf->cdev);
2133
2134 /* Settle time for CQEs to be returned */
2135 msleep(100);
2136
2137 /* Unplug and continue */
2138 clear_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
2139 }
2140
2141 /*
2142 * Returns SUCCESS if the cleanup task does not timeout, otherwise return
2143 * FAILURE.
2144 */
2145 int qedf_initiate_cleanup(struct qedf_ioreq *io_req,
2146 bool return_scsi_cmd_on_abts)
2147 {
2148 struct qedf_rport *fcport;
2149 struct qedf_ctx *qedf;
2150 int tmo = 0;
2151 int rc = SUCCESS;
2152 unsigned long flags;
2153 struct fcoe_wqe *sqe;
2154 u16 sqe_idx;
2155 int refcount = 0;
2156
2157 fcport = io_req->fcport;
2158 if (!fcport) {
2159 QEDF_ERR(NULL, "fcport is NULL.\n");
2160 return SUCCESS;
2161 }
2162
2163 /* Sanity check qedf_rport before dereferencing any pointers */
2164 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
2165 QEDF_ERR(NULL, "tgt not offloaded\n");
2166 return SUCCESS;
2167 }
2168
2169 qedf = fcport->qedf;
2170 if (!qedf) {
2171 QEDF_ERR(NULL, "qedf is NULL.\n");
2172 return SUCCESS;
2173 }
2174
2175 if (io_req->cmd_type == QEDF_ELS) {
2176 goto process_els;
2177 }
2178
2179 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
2180 test_and_set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags)) {
2181 QEDF_ERR(&(qedf->dbg_ctx), "io_req xid=0x%x already in "
2182 "cleanup processing or already completed.\n",
2183 io_req->xid);
2184 return SUCCESS;
2185 }
2186 set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2187
2188 process_els:
2189 /* Ensure room on SQ */
2190 if (!atomic_read(&fcport->free_sqes)) {
2191 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
2192 /* Need to make sure we clear the flag since it was set */
2193 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2194 return FAILED;
2195 }
2196
2197 if (io_req->cmd_type == QEDF_CLEANUP) {
2198 QEDF_ERR(&qedf->dbg_ctx,
2199 "io_req=0x%x is already a cleanup command cmd_type=%d.\n",
2200 io_req->xid, io_req->cmd_type);
2201 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2202 return SUCCESS;
2203 }
2204
2205 refcount = kref_read(&io_req->refcount);
2206
2207 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
2208 "Entered xid=0x%x sc_cmd=%p cmd_type=%d flags=0x%lx refcount=%d fcport=%p port_id=0x%06x\n",
2209 io_req->xid, io_req->sc_cmd, io_req->cmd_type, io_req->flags,
2210 refcount, fcport, fcport->rdata->ids.port_id);
2211
2212 /* Cleanup cmds re-use the same TID as the original I/O */
2213 io_req->cmd_type = QEDF_CLEANUP;
2214 io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
2215
2216 init_completion(&io_req->cleanup_done);
2217
2218 spin_lock_irqsave(&fcport->rport_lock, flags);
2219
2220 sqe_idx = qedf_get_sqe_idx(fcport);
2221 sqe = &fcport->sq[sqe_idx];
2222 memset(sqe, 0, sizeof(struct fcoe_wqe));
2223 io_req->task_params->sqe = sqe;
2224
2225 init_initiator_cleanup_fcoe_task(io_req->task_params);
2226 qedf_ring_doorbell(fcport);
2227
2228 spin_unlock_irqrestore(&fcport->rport_lock, flags);
2229
2230 tmo = wait_for_completion_timeout(&io_req->cleanup_done,
2231 QEDF_CLEANUP_TIMEOUT * HZ);
2232
2233 if (!tmo) {
2234 rc = FAILED;
2235 /* Timeout case */
2236 QEDF_ERR(&(qedf->dbg_ctx), "Cleanup command timeout, "
2237 "xid=%x.\n", io_req->xid);
2238 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2239 /* Issue a drain request if cleanup task times out */
2240 QEDF_ERR(&(qedf->dbg_ctx), "Issuing MCP drain request.\n");
2241 qedf_drain_request(qedf);
2242 }
2243
2244 /* If it TASK MGMT handle it, reference will be decreased
2245 * in qedf_execute_tmf
2246 */
2247 if (io_req->tm_flags == FCP_TMF_LUN_RESET ||
2248 io_req->tm_flags == FCP_TMF_TGT_RESET) {
2249 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2250 io_req->sc_cmd = NULL;
2251 complete(&io_req->tm_done);
2252 }
2253
2254 if (io_req->sc_cmd) {
2255 if (!io_req->return_scsi_cmd_on_abts)
2256 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2257 "Not call scsi_done for xid=0x%x.\n",
2258 io_req->xid);
2259 if (io_req->return_scsi_cmd_on_abts)
2260 qedf_scsi_done(qedf, io_req, DID_ERROR);
2261 }
2262
2263 if (rc == SUCCESS)
2264 io_req->event = QEDF_IOREQ_EV_CLEANUP_SUCCESS;
2265 else
2266 io_req->event = QEDF_IOREQ_EV_CLEANUP_FAILED;
2267
2268 return rc;
2269 }
2270
2271 void qedf_process_cleanup_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
2272 struct qedf_ioreq *io_req)
2273 {
2274 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Entered xid = 0x%x\n",
2275 io_req->xid);
2276
2277 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2278
2279 /* Complete so we can finish cleaning up the I/O */
2280 complete(&io_req->cleanup_done);
2281 }
2282
2283 static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
2284 uint8_t tm_flags)
2285 {
2286 struct qedf_ioreq *io_req;
2287 struct e4_fcoe_task_context *task;
2288 struct qedf_ctx *qedf = fcport->qedf;
2289 struct fc_lport *lport = qedf->lport;
2290 int rc = 0;
2291 uint16_t xid;
2292 int tmo = 0;
2293 int lun = 0;
2294 unsigned long flags;
2295 struct fcoe_wqe *sqe;
2296 u16 sqe_idx;
2297
2298 if (!sc_cmd) {
2299 QEDF_ERR(&qedf->dbg_ctx, "sc_cmd is NULL\n");
2300 return FAILED;
2301 }
2302
2303 lun = (int)sc_cmd->device->lun;
2304 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
2305 QEDF_ERR(&(qedf->dbg_ctx), "fcport not offloaded\n");
2306 rc = FAILED;
2307 goto no_flush;
2308 }
2309
2310 io_req = qedf_alloc_cmd(fcport, QEDF_TASK_MGMT_CMD);
2311 if (!io_req) {
2312 QEDF_ERR(&(qedf->dbg_ctx), "Failed TMF");
2313 rc = -EAGAIN;
2314 goto no_flush;
2315 }
2316
2317 if (tm_flags == FCP_TMF_LUN_RESET)
2318 qedf->lun_resets++;
2319 else if (tm_flags == FCP_TMF_TGT_RESET)
2320 qedf->target_resets++;
2321
2322 /* Initialize rest of io_req fields */
2323 io_req->sc_cmd = sc_cmd;
2324 io_req->fcport = fcport;
2325 io_req->cmd_type = QEDF_TASK_MGMT_CMD;
2326
2327 /* Record which cpu this request is associated with */
2328 io_req->cpu = smp_processor_id();
2329
2330 /* Set TM flags */
2331 io_req->io_req_flags = QEDF_READ;
2332 io_req->data_xfer_len = 0;
2333 io_req->tm_flags = tm_flags;
2334
2335 /* Default is to return a SCSI command when an error occurs */
2336 io_req->return_scsi_cmd_on_abts = false;
2337
2338 /* Obtain exchange id */
2339 xid = io_req->xid;
2340
2341 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "TMF io_req xid = "
2342 "0x%x\n", xid);
2343
2344 /* Initialize task context for this IO request */
2345 task = qedf_get_task_mem(&qedf->tasks, xid);
2346
2347 init_completion(&io_req->tm_done);
2348
2349 spin_lock_irqsave(&fcport->rport_lock, flags);
2350
2351 sqe_idx = qedf_get_sqe_idx(fcport);
2352 sqe = &fcport->sq[sqe_idx];
2353 memset(sqe, 0, sizeof(struct fcoe_wqe));
2354
2355 qedf_init_task(fcport, lport, io_req, task, sqe);
2356 qedf_ring_doorbell(fcport);
2357
2358 spin_unlock_irqrestore(&fcport->rport_lock, flags);
2359
2360 set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2361 tmo = wait_for_completion_timeout(&io_req->tm_done,
2362 QEDF_TM_TIMEOUT * HZ);
2363
2364 if (!tmo) {
2365 rc = FAILED;
2366 QEDF_ERR(&(qedf->dbg_ctx), "wait for tm_cmpl timeout!\n");
2367 /* Clear outstanding bit since command timed out */
2368 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2369 io_req->sc_cmd = NULL;
2370 } else {
2371 /* Check TMF response code */
2372 if (io_req->fcp_rsp_code == 0)
2373 rc = SUCCESS;
2374 else
2375 rc = FAILED;
2376 }
2377 /*
2378 * Double check that fcport has not gone into an uploading state before
2379 * executing the command flush for the LUN/target.
2380 */
2381 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2382 QEDF_ERR(&qedf->dbg_ctx,
2383 "fcport is uploading, not executing flush.\n");
2384 goto no_flush;
2385 }
2386 /* We do not need this io_req any more */
2387 kref_put(&io_req->refcount, qedf_release_cmd);
2388
2389
2390 if (tm_flags == FCP_TMF_LUN_RESET)
2391 qedf_flush_active_ios(fcport, lun);
2392 else
2393 qedf_flush_active_ios(fcport, -1);
2394
2395 no_flush:
2396 if (rc != SUCCESS) {
2397 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command failed...\n");
2398 rc = FAILED;
2399 } else {
2400 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command success...\n");
2401 rc = SUCCESS;
2402 }
2403 return rc;
2404 }
2405
2406 int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
2407 {
2408 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2409 struct fc_rport_libfc_priv *rp = rport->dd_data;
2410 struct qedf_rport *fcport = (struct qedf_rport *)&rp[1];
2411 struct qedf_ctx *qedf;
2412 struct fc_lport *lport = shost_priv(sc_cmd->device->host);
2413 int rc = SUCCESS;
2414 int rval;
2415 struct qedf_ioreq *io_req = NULL;
2416 int ref_cnt = 0;
2417 struct fc_rport_priv *rdata = fcport->rdata;
2418
2419 QEDF_ERR(NULL,
2420 "tm_flags 0x%x sc_cmd %p op = 0x%02x target_id = 0x%x lun=%d\n",
2421 tm_flags, sc_cmd, sc_cmd->cmd_len ? sc_cmd->cmnd[0] : 0xff,
2422 rport->scsi_target_id, (int)sc_cmd->device->lun);
2423
2424 if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
2425 QEDF_ERR(NULL, "stale rport\n");
2426 return FAILED;
2427 }
2428
2429 QEDF_ERR(NULL, "portid=%06x tm_flags =%s\n", rdata->ids.port_id,
2430 (tm_flags == FCP_TMF_TGT_RESET) ? "TARGET RESET" :
2431 "LUN RESET");
2432
2433 if (sc_cmd->SCp.ptr) {
2434 io_req = (struct qedf_ioreq *)sc_cmd->SCp.ptr;
2435 ref_cnt = kref_read(&io_req->refcount);
2436 QEDF_ERR(NULL,
2437 "orig io_req = %p xid = 0x%x ref_cnt = %d.\n",
2438 io_req, io_req->xid, ref_cnt);
2439 }
2440
2441 rval = fc_remote_port_chkready(rport);
2442 if (rval) {
2443 QEDF_ERR(NULL, "device_reset rport not ready\n");
2444 rc = FAILED;
2445 goto tmf_err;
2446 }
2447
2448 rc = fc_block_scsi_eh(sc_cmd);
2449 if (rc)
2450 goto tmf_err;
2451
2452 if (!fcport) {
2453 QEDF_ERR(NULL, "device_reset: rport is NULL\n");
2454 rc = FAILED;
2455 goto tmf_err;
2456 }
2457
2458 qedf = fcport->qedf;
2459
2460 if (!qedf) {
2461 QEDF_ERR(NULL, "qedf is NULL.\n");
2462 rc = FAILED;
2463 goto tmf_err;
2464 }
2465
2466 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2467 QEDF_ERR(&qedf->dbg_ctx, "Connection is getting uploaded.\n");
2468 rc = SUCCESS;
2469 goto tmf_err;
2470 }
2471
2472 if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
2473 test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
2474 rc = SUCCESS;
2475 goto tmf_err;
2476 }
2477
2478 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
2479 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
2480 rc = FAILED;
2481 goto tmf_err;
2482 }
2483
2484 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2485 if (!fcport->rdata)
2486 QEDF_ERR(&qedf->dbg_ctx, "fcport %p is uploading.\n",
2487 fcport);
2488 else
2489 QEDF_ERR(&qedf->dbg_ctx,
2490 "fcport %p port_id=%06x is uploading.\n",
2491 fcport, fcport->rdata->ids.port_id);
2492 rc = FAILED;
2493 goto tmf_err;
2494 }
2495
2496 rc = qedf_execute_tmf(fcport, sc_cmd, tm_flags);
2497
2498 tmf_err:
2499 kref_put(&rdata->kref, fc_rport_destroy);
2500 return rc;
2501 }
2502
2503 void qedf_process_tmf_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
2504 struct qedf_ioreq *io_req)
2505 {
2506 struct fcoe_cqe_rsp_info *fcp_rsp;
2507
2508 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2509
2510 fcp_rsp = &cqe->cqe_info.rsp_info;
2511 qedf_parse_fcp_rsp(io_req, fcp_rsp);
2512
2513 io_req->sc_cmd = NULL;
2514 complete(&io_req->tm_done);
2515 }
2516
2517 void qedf_process_unsol_compl(struct qedf_ctx *qedf, uint16_t que_idx,
2518 struct fcoe_cqe *cqe)
2519 {
2520 unsigned long flags;
2521 uint16_t pktlen = cqe->cqe_info.unsolic_info.pkt_len;
2522 u32 payload_len, crc;
2523 struct fc_frame_header *fh;
2524 struct fc_frame *fp;
2525 struct qedf_io_work *io_work;
2526 u32 bdq_idx;
2527 void *bdq_addr;
2528 struct scsi_bd *p_bd_info;
2529
2530 p_bd_info = &cqe->cqe_info.unsolic_info.bd_info;
2531 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2532 "address.hi=%x, address.lo=%x, opaque_data.hi=%x, opaque_data.lo=%x, bdq_prod_idx=%u, len=%u\n",
2533 le32_to_cpu(p_bd_info->address.hi),
2534 le32_to_cpu(p_bd_info->address.lo),
2535 le32_to_cpu(p_bd_info->opaque.fcoe_opaque.hi),
2536 le32_to_cpu(p_bd_info->opaque.fcoe_opaque.lo),
2537 qedf->bdq_prod_idx, pktlen);
2538
2539 bdq_idx = le32_to_cpu(p_bd_info->opaque.fcoe_opaque.lo);
2540 if (bdq_idx >= QEDF_BDQ_SIZE) {
2541 QEDF_ERR(&(qedf->dbg_ctx), "bdq_idx is out of range %d.\n",
2542 bdq_idx);
2543 goto increment_prod;
2544 }
2545
2546 bdq_addr = qedf->bdq[bdq_idx].buf_addr;
2547 if (!bdq_addr) {
2548 QEDF_ERR(&(qedf->dbg_ctx), "bdq_addr is NULL, dropping "
2549 "unsolicited packet.\n");
2550 goto increment_prod;
2551 }
2552
2553 if (qedf_dump_frames) {
2554 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2555 "BDQ frame is at addr=%p.\n", bdq_addr);
2556 print_hex_dump(KERN_WARNING, "bdq ", DUMP_PREFIX_OFFSET, 16, 1,
2557 (void *)bdq_addr, pktlen, false);
2558 }
2559
2560 /* Allocate frame */
2561 payload_len = pktlen - sizeof(struct fc_frame_header);
2562 fp = fc_frame_alloc(qedf->lport, payload_len);
2563 if (!fp) {
2564 QEDF_ERR(&(qedf->dbg_ctx), "Could not allocate fp.\n");
2565 goto increment_prod;
2566 }
2567
2568 /* Copy data from BDQ buffer into fc_frame struct */
2569 fh = (struct fc_frame_header *)fc_frame_header_get(fp);
2570 memcpy(fh, (void *)bdq_addr, pktlen);
2571
2572 QEDF_WARN(&qedf->dbg_ctx,
2573 "Processing Unsolicated frame, src=%06x dest=%06x r_ctl=0x%x type=0x%x cmd=%02x\n",
2574 ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id), fh->fh_r_ctl,
2575 fh->fh_type, fc_frame_payload_op(fp));
2576
2577 /* Initialize the frame so libfc sees it as a valid frame */
2578 crc = fcoe_fc_crc(fp);
2579 fc_frame_init(fp);
2580 fr_dev(fp) = qedf->lport;
2581 fr_sof(fp) = FC_SOF_I3;
2582 fr_eof(fp) = FC_EOF_T;
2583 fr_crc(fp) = cpu_to_le32(~crc);
2584
2585 /*
2586 * We need to return the frame back up to libfc in a non-atomic
2587 * context
2588 */
2589 io_work = mempool_alloc(qedf->io_mempool, GFP_ATOMIC);
2590 if (!io_work) {
2591 QEDF_WARN(&(qedf->dbg_ctx), "Could not allocate "
2592 "work for I/O completion.\n");
2593 fc_frame_free(fp);
2594 goto increment_prod;
2595 }
2596 memset(io_work, 0, sizeof(struct qedf_io_work));
2597
2598 INIT_WORK(&io_work->work, qedf_fp_io_handler);
2599
2600 /* Copy contents of CQE for deferred processing */
2601 memcpy(&io_work->cqe, cqe, sizeof(struct fcoe_cqe));
2602
2603 io_work->qedf = qedf;
2604 io_work->fp = fp;
2605
2606 queue_work_on(smp_processor_id(), qedf_io_wq, &io_work->work);
2607 increment_prod:
2608 spin_lock_irqsave(&qedf->hba_lock, flags);
2609
2610 /* Increment producer to let f/w know we've handled the frame */
2611 qedf->bdq_prod_idx++;
2612
2613 /* Producer index wraps at uint16_t boundary */
2614 if (qedf->bdq_prod_idx == 0xffff)
2615 qedf->bdq_prod_idx = 0;
2616
2617 writew(qedf->bdq_prod_idx, qedf->bdq_primary_prod);
2618 readw(qedf->bdq_primary_prod);
2619 writew(qedf->bdq_prod_idx, qedf->bdq_secondary_prod);
2620 readw(qedf->bdq_secondary_prod);
2621
2622 spin_unlock_irqrestore(&qedf->hba_lock, flags);
2623 }
Linux with added FPC-III support