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
qedf_cmd_timer_set(struct qedf_ctx * qedf,struct qedf_ioreq * io_req,unsigned int timer_msec)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
qedf_cmd_timeout(struct work_struct * work)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 fcport = io_req->fcport;
27 if (io_req->fcport == NULL) {
28 QEDF_INFO(NULL, QEDF_LOG_IO, "fcport is NULL.\n");
29 return;
30 }
31
32 qedf = fcport->qedf;
33
34 switch (io_req->cmd_type) {
35 case QEDF_ABTS:
36 if (qedf == NULL) {
37 QEDF_INFO(NULL, QEDF_LOG_IO,
38 "qedf is NULL for ABTS xid=0x%x.\n",
39 io_req->xid);
40 return;
41 }
42
43 QEDF_ERR((&qedf->dbg_ctx), "ABTS timeout, xid=0x%x.\n",
44 io_req->xid);
45 /* Cleanup timed out ABTS */
46 qedf_initiate_cleanup(io_req, true);
47 complete(&io_req->abts_done);
48
49 /*
50 * Need to call kref_put for reference taken when initiate_abts
51 * was called since abts_compl won't be called now that we've
52 * cleaned up the task.
53 */
54 kref_put(&io_req->refcount, qedf_release_cmd);
55
56 /* Clear in abort bit now that we're done with the command */
57 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
58
59 /*
60 * Now that the original I/O and the ABTS are complete see
61 * if we need to reconnect to the target.
62 */
63 qedf_restart_rport(fcport);
64 break;
65 case QEDF_ELS:
66 if (!qedf) {
67 QEDF_INFO(NULL, QEDF_LOG_IO,
68 "qedf is NULL for ELS xid=0x%x.\n",
69 io_req->xid);
70 return;
71 }
72 /* ELS request no longer outstanding since it timed out */
73 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
74
75 kref_get(&io_req->refcount);
76 /*
77 * Don't attempt to clean an ELS timeout as any subseqeunt
78 * ABTS or cleanup requests just hang. For now just free
79 * the resources of the original I/O and the RRQ
80 */
81 QEDF_ERR(&(qedf->dbg_ctx), "ELS timeout, xid=0x%x.\n",
82 io_req->xid);
83 qedf_initiate_cleanup(io_req, true);
84 io_req->event = QEDF_IOREQ_EV_ELS_TMO;
85 /* Call callback function to complete command */
86 if (io_req->cb_func && io_req->cb_arg) {
87 io_req->cb_func(io_req->cb_arg);
88 io_req->cb_arg = NULL;
89 }
90 kref_put(&io_req->refcount, qedf_release_cmd);
91 break;
92 case QEDF_SEQ_CLEANUP:
93 QEDF_ERR(&(qedf->dbg_ctx), "Sequence cleanup timeout, "
94 "xid=0x%x.\n", io_req->xid);
95 qedf_initiate_cleanup(io_req, true);
96 io_req->event = QEDF_IOREQ_EV_ELS_TMO;
97 qedf_process_seq_cleanup_compl(qedf, NULL, io_req);
98 break;
99 default:
100 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
101 "Hit default case, xid=0x%x.\n", io_req->xid);
102 break;
103 }
104 }
105
qedf_cmd_mgr_free(struct qedf_cmd_mgr * cmgr)106 void qedf_cmd_mgr_free(struct qedf_cmd_mgr *cmgr)
107 {
108 struct io_bdt *bdt_info;
109 struct qedf_ctx *qedf = cmgr->qedf;
110 size_t bd_tbl_sz;
111 u16 min_xid = 0;
112 u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
113 int num_ios;
114 int i;
115 struct qedf_ioreq *io_req;
116
117 num_ios = max_xid - min_xid + 1;
118
119 /* Free fcoe_bdt_ctx structures */
120 if (!cmgr->io_bdt_pool) {
121 QEDF_ERR(&qedf->dbg_ctx, "io_bdt_pool is NULL.\n");
122 goto free_cmd_pool;
123 }
124
125 bd_tbl_sz = QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge);
126 for (i = 0; i < num_ios; i++) {
127 bdt_info = cmgr->io_bdt_pool[i];
128 if (bdt_info->bd_tbl) {
129 dma_free_coherent(&qedf->pdev->dev, bd_tbl_sz,
130 bdt_info->bd_tbl, bdt_info->bd_tbl_dma);
131 bdt_info->bd_tbl = NULL;
132 }
133 }
134
135 /* Destroy io_bdt pool */
136 for (i = 0; i < num_ios; i++) {
137 kfree(cmgr->io_bdt_pool[i]);
138 cmgr->io_bdt_pool[i] = NULL;
139 }
140
141 kfree(cmgr->io_bdt_pool);
142 cmgr->io_bdt_pool = NULL;
143
144 free_cmd_pool:
145
146 for (i = 0; i < num_ios; i++) {
147 io_req = &cmgr->cmds[i];
148 kfree(io_req->sgl_task_params);
149 kfree(io_req->task_params);
150 /* Make sure we free per command sense buffer */
151 if (io_req->sense_buffer)
152 dma_free_coherent(&qedf->pdev->dev,
153 QEDF_SCSI_SENSE_BUFFERSIZE, io_req->sense_buffer,
154 io_req->sense_buffer_dma);
155 cancel_delayed_work_sync(&io_req->rrq_work);
156 }
157
158 /* Free command manager itself */
159 vfree(cmgr);
160 }
161
qedf_handle_rrq(struct work_struct * work)162 static void qedf_handle_rrq(struct work_struct *work)
163 {
164 struct qedf_ioreq *io_req =
165 container_of(work, struct qedf_ioreq, rrq_work.work);
166
167 atomic_set(&io_req->state, QEDFC_CMD_ST_RRQ_ACTIVE);
168 qedf_send_rrq(io_req);
169
170 }
171
qedf_cmd_mgr_alloc(struct qedf_ctx * qedf)172 struct qedf_cmd_mgr *qedf_cmd_mgr_alloc(struct qedf_ctx *qedf)
173 {
174 struct qedf_cmd_mgr *cmgr;
175 struct io_bdt *bdt_info;
176 struct qedf_ioreq *io_req;
177 u16 xid;
178 int i;
179 int num_ios;
180 u16 min_xid = 0;
181 u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
182
183 /* Make sure num_queues is already set before calling this function */
184 if (!qedf->num_queues) {
185 QEDF_ERR(&(qedf->dbg_ctx), "num_queues is not set.\n");
186 return NULL;
187 }
188
189 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
190 QEDF_WARN(&(qedf->dbg_ctx), "Invalid min_xid 0x%x and "
191 "max_xid 0x%x.\n", min_xid, max_xid);
192 return NULL;
193 }
194
195 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "min xid 0x%x, max xid "
196 "0x%x.\n", min_xid, max_xid);
197
198 num_ios = max_xid - min_xid + 1;
199
200 cmgr = vzalloc(sizeof(struct qedf_cmd_mgr));
201 if (!cmgr) {
202 QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc cmd mgr.\n");
203 return NULL;
204 }
205
206 cmgr->qedf = qedf;
207 spin_lock_init(&cmgr->lock);
208
209 /*
210 * Initialize I/O request fields.
211 */
212 xid = 0;
213
214 for (i = 0; i < num_ios; i++) {
215 io_req = &cmgr->cmds[i];
216 INIT_DELAYED_WORK(&io_req->timeout_work, qedf_cmd_timeout);
217
218 io_req->xid = xid++;
219
220 INIT_DELAYED_WORK(&io_req->rrq_work, qedf_handle_rrq);
221
222 /* Allocate DMA memory to hold sense buffer */
223 io_req->sense_buffer = dma_alloc_coherent(&qedf->pdev->dev,
224 QEDF_SCSI_SENSE_BUFFERSIZE, &io_req->sense_buffer_dma,
225 GFP_KERNEL);
226 if (!io_req->sense_buffer) {
227 QEDF_ERR(&qedf->dbg_ctx,
228 "Failed to alloc sense buffer.\n");
229 goto mem_err;
230 }
231
232 /* Allocate task parameters to pass to f/w init funcions */
233 io_req->task_params = kzalloc(sizeof(*io_req->task_params),
234 GFP_KERNEL);
235 if (!io_req->task_params) {
236 QEDF_ERR(&(qedf->dbg_ctx),
237 "Failed to allocate task_params for xid=0x%x\n",
238 i);
239 goto mem_err;
240 }
241
242 /*
243 * Allocate scatter/gather list info to pass to f/w init
244 * functions.
245 */
246 io_req->sgl_task_params = kzalloc(
247 sizeof(struct scsi_sgl_task_params), GFP_KERNEL);
248 if (!io_req->sgl_task_params) {
249 QEDF_ERR(&(qedf->dbg_ctx),
250 "Failed to allocate sgl_task_params for xid=0x%x\n",
251 i);
252 goto mem_err;
253 }
254 }
255
256 /* Allocate pool of io_bdts - one for each qedf_ioreq */
257 cmgr->io_bdt_pool = kmalloc_array(num_ios, sizeof(struct io_bdt *),
258 GFP_KERNEL);
259
260 if (!cmgr->io_bdt_pool) {
261 QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc io_bdt_pool.\n");
262 goto mem_err;
263 }
264
265 for (i = 0; i < num_ios; i++) {
266 cmgr->io_bdt_pool[i] = kmalloc(sizeof(struct io_bdt),
267 GFP_KERNEL);
268 if (!cmgr->io_bdt_pool[i]) {
269 QEDF_WARN(&(qedf->dbg_ctx),
270 "Failed to alloc io_bdt_pool[%d].\n", i);
271 goto mem_err;
272 }
273 }
274
275 for (i = 0; i < num_ios; i++) {
276 bdt_info = cmgr->io_bdt_pool[i];
277 bdt_info->bd_tbl = dma_alloc_coherent(&qedf->pdev->dev,
278 QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge),
279 &bdt_info->bd_tbl_dma, GFP_KERNEL);
280 if (!bdt_info->bd_tbl) {
281 QEDF_WARN(&(qedf->dbg_ctx),
282 "Failed to alloc bdt_tbl[%d].\n", i);
283 goto mem_err;
284 }
285 }
286 atomic_set(&cmgr->free_list_cnt, num_ios);
287 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
288 "cmgr->free_list_cnt=%d.\n",
289 atomic_read(&cmgr->free_list_cnt));
290
291 return cmgr;
292
293 mem_err:
294 qedf_cmd_mgr_free(cmgr);
295 return NULL;
296 }
297
qedf_alloc_cmd(struct qedf_rport * fcport,u8 cmd_type)298 struct qedf_ioreq *qedf_alloc_cmd(struct qedf_rport *fcport, u8 cmd_type)
299 {
300 struct qedf_ctx *qedf = fcport->qedf;
301 struct qedf_cmd_mgr *cmd_mgr = qedf->cmd_mgr;
302 struct qedf_ioreq *io_req = NULL;
303 struct io_bdt *bd_tbl;
304 u16 xid;
305 uint32_t free_sqes;
306 int i;
307 unsigned long flags;
308
309 free_sqes = atomic_read(&fcport->free_sqes);
310
311 if (!free_sqes) {
312 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
313 "Returning NULL, free_sqes=%d.\n ",
314 free_sqes);
315 goto out_failed;
316 }
317
318 /* Limit the number of outstanding R/W tasks */
319 if ((atomic_read(&fcport->num_active_ios) >=
320 NUM_RW_TASKS_PER_CONNECTION)) {
321 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
322 "Returning NULL, num_active_ios=%d.\n",
323 atomic_read(&fcport->num_active_ios));
324 goto out_failed;
325 }
326
327 /* Limit global TIDs certain tasks */
328 if (atomic_read(&cmd_mgr->free_list_cnt) <= GBL_RSVD_TASKS) {
329 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
330 "Returning NULL, free_list_cnt=%d.\n",
331 atomic_read(&cmd_mgr->free_list_cnt));
332 goto out_failed;
333 }
334
335 spin_lock_irqsave(&cmd_mgr->lock, flags);
336 for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
337 io_req = &cmd_mgr->cmds[cmd_mgr->idx];
338 cmd_mgr->idx++;
339 if (cmd_mgr->idx == FCOE_PARAMS_NUM_TASKS)
340 cmd_mgr->idx = 0;
341
342 /* Check to make sure command was previously freed */
343 if (!io_req->alloc)
344 break;
345 }
346
347 if (i == FCOE_PARAMS_NUM_TASKS) {
348 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
349 goto out_failed;
350 }
351
352 if (test_bit(QEDF_CMD_DIRTY, &io_req->flags))
353 QEDF_ERR(&qedf->dbg_ctx,
354 "io_req found to be dirty ox_id = 0x%x.\n",
355 io_req->xid);
356
357 /* Clear any flags now that we've reallocated the xid */
358 io_req->flags = 0;
359 io_req->alloc = 1;
360 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
361
362 atomic_inc(&fcport->num_active_ios);
363 atomic_dec(&fcport->free_sqes);
364 xid = io_req->xid;
365 atomic_dec(&cmd_mgr->free_list_cnt);
366
367 io_req->cmd_mgr = cmd_mgr;
368 io_req->fcport = fcport;
369
370 /* Clear any stale sc_cmd back pointer */
371 io_req->sc_cmd = NULL;
372 io_req->lun = -1;
373
374 /* Hold the io_req against deletion */
375 kref_init(&io_req->refcount); /* ID: 001 */
376 atomic_set(&io_req->state, QEDFC_CMD_ST_IO_ACTIVE);
377
378 /* Bind io_bdt for this io_req */
379 /* Have a static link between io_req and io_bdt_pool */
380 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
381 if (bd_tbl == NULL) {
382 QEDF_ERR(&(qedf->dbg_ctx), "bd_tbl is NULL, xid=%x.\n", xid);
383 kref_put(&io_req->refcount, qedf_release_cmd);
384 goto out_failed;
385 }
386 bd_tbl->io_req = io_req;
387 io_req->cmd_type = cmd_type;
388 io_req->tm_flags = 0;
389
390 /* Reset sequence offset data */
391 io_req->rx_buf_off = 0;
392 io_req->tx_buf_off = 0;
393 io_req->rx_id = 0xffff; /* No OX_ID */
394
395 return io_req;
396
397 out_failed:
398 /* Record failure for stats and return NULL to caller */
399 qedf->alloc_failures++;
400 return NULL;
401 }
402
qedf_free_mp_resc(struct qedf_ioreq * io_req)403 static void qedf_free_mp_resc(struct qedf_ioreq *io_req)
404 {
405 struct qedf_mp_req *mp_req = &(io_req->mp_req);
406 struct qedf_ctx *qedf = io_req->fcport->qedf;
407 uint64_t sz = sizeof(struct scsi_sge);
408
409 /* clear tm flags */
410 if (mp_req->mp_req_bd) {
411 dma_free_coherent(&qedf->pdev->dev, sz,
412 mp_req->mp_req_bd, mp_req->mp_req_bd_dma);
413 mp_req->mp_req_bd = NULL;
414 }
415 if (mp_req->mp_resp_bd) {
416 dma_free_coherent(&qedf->pdev->dev, sz,
417 mp_req->mp_resp_bd, mp_req->mp_resp_bd_dma);
418 mp_req->mp_resp_bd = NULL;
419 }
420 if (mp_req->req_buf) {
421 dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
422 mp_req->req_buf, mp_req->req_buf_dma);
423 mp_req->req_buf = NULL;
424 }
425 if (mp_req->resp_buf) {
426 dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
427 mp_req->resp_buf, mp_req->resp_buf_dma);
428 mp_req->resp_buf = NULL;
429 }
430 }
431
qedf_release_cmd(struct kref * ref)432 void qedf_release_cmd(struct kref *ref)
433 {
434 struct qedf_ioreq *io_req =
435 container_of(ref, struct qedf_ioreq, refcount);
436 struct qedf_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
437 struct qedf_rport *fcport = io_req->fcport;
438 unsigned long flags;
439
440 if (io_req->cmd_type == QEDF_SCSI_CMD) {
441 QEDF_WARN(&fcport->qedf->dbg_ctx,
442 "Cmd released called without scsi_done called, io_req %p xid=0x%x.\n",
443 io_req, io_req->xid);
444 WARN_ON(io_req->sc_cmd);
445 }
446
447 if (io_req->cmd_type == QEDF_ELS ||
448 io_req->cmd_type == QEDF_TASK_MGMT_CMD)
449 qedf_free_mp_resc(io_req);
450
451 atomic_inc(&cmd_mgr->free_list_cnt);
452 atomic_dec(&fcport->num_active_ios);
453 atomic_set(&io_req->state, QEDF_CMD_ST_INACTIVE);
454 if (atomic_read(&fcport->num_active_ios) < 0) {
455 QEDF_WARN(&(fcport->qedf->dbg_ctx), "active_ios < 0.\n");
456 WARN_ON(1);
457 }
458
459 /* Increment task retry identifier now that the request is released */
460 io_req->task_retry_identifier++;
461 io_req->fcport = NULL;
462
463 clear_bit(QEDF_CMD_DIRTY, &io_req->flags);
464 io_req->cpu = 0;
465 spin_lock_irqsave(&cmd_mgr->lock, flags);
466 io_req->fcport = NULL;
467 io_req->alloc = 0;
468 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
469 }
470
qedf_map_sg(struct qedf_ioreq * io_req)471 static int qedf_map_sg(struct qedf_ioreq *io_req)
472 {
473 struct scsi_cmnd *sc = io_req->sc_cmd;
474 struct Scsi_Host *host = sc->device->host;
475 struct fc_lport *lport = shost_priv(host);
476 struct qedf_ctx *qedf = lport_priv(lport);
477 struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
478 struct scatterlist *sg;
479 int byte_count = 0;
480 int sg_count = 0;
481 int bd_count = 0;
482 u32 sg_len;
483 u64 addr;
484 int i = 0;
485
486 sg_count = dma_map_sg(&qedf->pdev->dev, scsi_sglist(sc),
487 scsi_sg_count(sc), sc->sc_data_direction);
488 sg = scsi_sglist(sc);
489
490 io_req->sge_type = QEDF_IOREQ_UNKNOWN_SGE;
491
492 if (sg_count <= 8 || io_req->io_req_flags == QEDF_READ)
493 io_req->sge_type = QEDF_IOREQ_FAST_SGE;
494
495 scsi_for_each_sg(sc, sg, sg_count, i) {
496 sg_len = (u32)sg_dma_len(sg);
497 addr = (u64)sg_dma_address(sg);
498
499 /*
500 * Intermediate s/g element so check if start address
501 * is page aligned. Only required for writes and only if the
502 * number of scatter/gather elements is 8 or more.
503 */
504 if (io_req->sge_type == QEDF_IOREQ_UNKNOWN_SGE && (i) &&
505 (i != (sg_count - 1)) && sg_len < QEDF_PAGE_SIZE)
506 io_req->sge_type = QEDF_IOREQ_SLOW_SGE;
507
508 bd[bd_count].sge_addr.lo = cpu_to_le32(U64_LO(addr));
509 bd[bd_count].sge_addr.hi = cpu_to_le32(U64_HI(addr));
510 bd[bd_count].sge_len = cpu_to_le32(sg_len);
511
512 bd_count++;
513 byte_count += sg_len;
514 }
515
516 /* To catch a case where FAST and SLOW nothing is set, set FAST */
517 if (io_req->sge_type == QEDF_IOREQ_UNKNOWN_SGE)
518 io_req->sge_type = QEDF_IOREQ_FAST_SGE;
519
520 if (byte_count != scsi_bufflen(sc))
521 QEDF_ERR(&(qedf->dbg_ctx), "byte_count = %d != "
522 "scsi_bufflen = %d, task_id = 0x%x.\n", byte_count,
523 scsi_bufflen(sc), io_req->xid);
524
525 return bd_count;
526 }
527
qedf_build_bd_list_from_sg(struct qedf_ioreq * io_req)528 static int qedf_build_bd_list_from_sg(struct qedf_ioreq *io_req)
529 {
530 struct scsi_cmnd *sc = io_req->sc_cmd;
531 struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
532 int bd_count;
533
534 if (scsi_sg_count(sc)) {
535 bd_count = qedf_map_sg(io_req);
536 if (bd_count == 0)
537 return -ENOMEM;
538 } else {
539 bd_count = 0;
540 bd[0].sge_addr.lo = bd[0].sge_addr.hi = 0;
541 bd[0].sge_len = 0;
542 }
543 io_req->bd_tbl->bd_valid = bd_count;
544
545 return 0;
546 }
547
qedf_build_fcp_cmnd(struct qedf_ioreq * io_req,struct fcp_cmnd * fcp_cmnd)548 static void qedf_build_fcp_cmnd(struct qedf_ioreq *io_req,
549 struct fcp_cmnd *fcp_cmnd)
550 {
551 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
552
553 /* fcp_cmnd is 32 bytes */
554 memset(fcp_cmnd, 0, FCP_CMND_LEN);
555
556 /* 8 bytes: SCSI LUN info */
557 int_to_scsilun(sc_cmd->device->lun,
558 (struct scsi_lun *)&fcp_cmnd->fc_lun);
559
560 /* 4 bytes: flag info */
561 fcp_cmnd->fc_pri_ta = 0;
562 fcp_cmnd->fc_tm_flags = io_req->tm_flags;
563 fcp_cmnd->fc_flags = io_req->io_req_flags;
564 fcp_cmnd->fc_cmdref = 0;
565
566 /* Populate data direction */
567 if (io_req->cmd_type == QEDF_TASK_MGMT_CMD) {
568 fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
569 } else {
570 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE)
571 fcp_cmnd->fc_flags |= FCP_CFL_WRDATA;
572 else if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE)
573 fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
574 }
575
576 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
577
578 /* 16 bytes: CDB information */
579 if (io_req->cmd_type != QEDF_TASK_MGMT_CMD)
580 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
581
582 /* 4 bytes: FCP data length */
583 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
584 }
585
qedf_init_task(struct qedf_rport * fcport,struct fc_lport * lport,struct qedf_ioreq * io_req,struct e4_fcoe_task_context * task_ctx,struct fcoe_wqe * sqe)586 static void qedf_init_task(struct qedf_rport *fcport, struct fc_lport *lport,
587 struct qedf_ioreq *io_req, struct e4_fcoe_task_context *task_ctx,
588 struct fcoe_wqe *sqe)
589 {
590 enum fcoe_task_type task_type;
591 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
592 struct io_bdt *bd_tbl = io_req->bd_tbl;
593 u8 fcp_cmnd[32];
594 u32 tmp_fcp_cmnd[8];
595 int bd_count = 0;
596 struct qedf_ctx *qedf = fcport->qedf;
597 uint16_t cq_idx = smp_processor_id() % qedf->num_queues;
598 struct regpair sense_data_buffer_phys_addr;
599 u32 tx_io_size = 0;
600 u32 rx_io_size = 0;
601 int i, cnt;
602
603 /* Note init_initiator_rw_fcoe_task memsets the task context */
604 io_req->task = task_ctx;
605 memset(task_ctx, 0, sizeof(struct e4_fcoe_task_context));
606 memset(io_req->task_params, 0, sizeof(struct fcoe_task_params));
607 memset(io_req->sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
608
609 /* Set task type bassed on DMA directio of command */
610 if (io_req->cmd_type == QEDF_TASK_MGMT_CMD) {
611 task_type = FCOE_TASK_TYPE_READ_INITIATOR;
612 } else {
613 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
614 task_type = FCOE_TASK_TYPE_WRITE_INITIATOR;
615 tx_io_size = io_req->data_xfer_len;
616 } else {
617 task_type = FCOE_TASK_TYPE_READ_INITIATOR;
618 rx_io_size = io_req->data_xfer_len;
619 }
620 }
621
622 /* Setup the fields for fcoe_task_params */
623 io_req->task_params->context = task_ctx;
624 io_req->task_params->sqe = sqe;
625 io_req->task_params->task_type = task_type;
626 io_req->task_params->tx_io_size = tx_io_size;
627 io_req->task_params->rx_io_size = rx_io_size;
628 io_req->task_params->conn_cid = fcport->fw_cid;
629 io_req->task_params->itid = io_req->xid;
630 io_req->task_params->cq_rss_number = cq_idx;
631 io_req->task_params->is_tape_device = fcport->dev_type;
632
633 /* Fill in information for scatter/gather list */
634 if (io_req->cmd_type != QEDF_TASK_MGMT_CMD) {
635 bd_count = bd_tbl->bd_valid;
636 io_req->sgl_task_params->sgl = bd_tbl->bd_tbl;
637 io_req->sgl_task_params->sgl_phys_addr.lo =
638 U64_LO(bd_tbl->bd_tbl_dma);
639 io_req->sgl_task_params->sgl_phys_addr.hi =
640 U64_HI(bd_tbl->bd_tbl_dma);
641 io_req->sgl_task_params->num_sges = bd_count;
642 io_req->sgl_task_params->total_buffer_size =
643 scsi_bufflen(io_req->sc_cmd);
644 if (io_req->sge_type == QEDF_IOREQ_SLOW_SGE)
645 io_req->sgl_task_params->small_mid_sge = 1;
646 else
647 io_req->sgl_task_params->small_mid_sge = 0;
648 }
649
650 /* Fill in physical address of sense buffer */
651 sense_data_buffer_phys_addr.lo = U64_LO(io_req->sense_buffer_dma);
652 sense_data_buffer_phys_addr.hi = U64_HI(io_req->sense_buffer_dma);
653
654 /* fill FCP_CMND IU */
655 qedf_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tmp_fcp_cmnd);
656
657 /* Swap fcp_cmnd since FC is big endian */
658 cnt = sizeof(struct fcp_cmnd) / sizeof(u32);
659 for (i = 0; i < cnt; i++) {
660 tmp_fcp_cmnd[i] = cpu_to_be32(tmp_fcp_cmnd[i]);
661 }
662 memcpy(fcp_cmnd, tmp_fcp_cmnd, sizeof(struct fcp_cmnd));
663
664 init_initiator_rw_fcoe_task(io_req->task_params,
665 io_req->sgl_task_params,
666 sense_data_buffer_phys_addr,
667 io_req->task_retry_identifier, fcp_cmnd);
668
669 /* Increment SGL type counters */
670 if (io_req->sge_type == QEDF_IOREQ_SLOW_SGE)
671 qedf->slow_sge_ios++;
672 else
673 qedf->fast_sge_ios++;
674 }
675
qedf_init_mp_task(struct qedf_ioreq * io_req,struct e4_fcoe_task_context * task_ctx,struct fcoe_wqe * sqe)676 void qedf_init_mp_task(struct qedf_ioreq *io_req,
677 struct e4_fcoe_task_context *task_ctx, struct fcoe_wqe *sqe)
678 {
679 struct qedf_mp_req *mp_req = &(io_req->mp_req);
680 struct qedf_rport *fcport = io_req->fcport;
681 struct qedf_ctx *qedf = io_req->fcport->qedf;
682 struct fc_frame_header *fc_hdr;
683 struct fcoe_tx_mid_path_params task_fc_hdr;
684 struct scsi_sgl_task_params tx_sgl_task_params;
685 struct scsi_sgl_task_params rx_sgl_task_params;
686
687 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
688 "Initializing MP task for cmd_type=%d\n",
689 io_req->cmd_type);
690
691 qedf->control_requests++;
692
693 memset(&tx_sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
694 memset(&rx_sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
695 memset(task_ctx, 0, sizeof(struct e4_fcoe_task_context));
696 memset(&task_fc_hdr, 0, sizeof(struct fcoe_tx_mid_path_params));
697
698 /* Setup the task from io_req for easy reference */
699 io_req->task = task_ctx;
700
701 /* Setup the fields for fcoe_task_params */
702 io_req->task_params->context = task_ctx;
703 io_req->task_params->sqe = sqe;
704 io_req->task_params->task_type = FCOE_TASK_TYPE_MIDPATH;
705 io_req->task_params->tx_io_size = io_req->data_xfer_len;
706 /* rx_io_size tells the f/w how large a response buffer we have */
707 io_req->task_params->rx_io_size = PAGE_SIZE;
708 io_req->task_params->conn_cid = fcport->fw_cid;
709 io_req->task_params->itid = io_req->xid;
710 /* Return middle path commands on CQ 0 */
711 io_req->task_params->cq_rss_number = 0;
712 io_req->task_params->is_tape_device = fcport->dev_type;
713
714 fc_hdr = &(mp_req->req_fc_hdr);
715 /* Set OX_ID and RX_ID based on driver task id */
716 fc_hdr->fh_ox_id = io_req->xid;
717 fc_hdr->fh_rx_id = htons(0xffff);
718
719 /* Set up FC header information */
720 task_fc_hdr.parameter = fc_hdr->fh_parm_offset;
721 task_fc_hdr.r_ctl = fc_hdr->fh_r_ctl;
722 task_fc_hdr.type = fc_hdr->fh_type;
723 task_fc_hdr.cs_ctl = fc_hdr->fh_cs_ctl;
724 task_fc_hdr.df_ctl = fc_hdr->fh_df_ctl;
725 task_fc_hdr.rx_id = fc_hdr->fh_rx_id;
726 task_fc_hdr.ox_id = fc_hdr->fh_ox_id;
727
728 /* Set up s/g list parameters for request buffer */
729 tx_sgl_task_params.sgl = mp_req->mp_req_bd;
730 tx_sgl_task_params.sgl_phys_addr.lo = U64_LO(mp_req->mp_req_bd_dma);
731 tx_sgl_task_params.sgl_phys_addr.hi = U64_HI(mp_req->mp_req_bd_dma);
732 tx_sgl_task_params.num_sges = 1;
733 /* Set PAGE_SIZE for now since sg element is that size ??? */
734 tx_sgl_task_params.total_buffer_size = io_req->data_xfer_len;
735 tx_sgl_task_params.small_mid_sge = 0;
736
737 /* Set up s/g list parameters for request buffer */
738 rx_sgl_task_params.sgl = mp_req->mp_resp_bd;
739 rx_sgl_task_params.sgl_phys_addr.lo = U64_LO(mp_req->mp_resp_bd_dma);
740 rx_sgl_task_params.sgl_phys_addr.hi = U64_HI(mp_req->mp_resp_bd_dma);
741 rx_sgl_task_params.num_sges = 1;
742 /* Set PAGE_SIZE for now since sg element is that size ??? */
743 rx_sgl_task_params.total_buffer_size = PAGE_SIZE;
744 rx_sgl_task_params.small_mid_sge = 0;
745
746
747 /*
748 * Last arg is 0 as previous code did not set that we wanted the
749 * fc header information.
750 */
751 init_initiator_midpath_unsolicited_fcoe_task(io_req->task_params,
752 &task_fc_hdr,
753 &tx_sgl_task_params,
754 &rx_sgl_task_params, 0);
755 }
756
757 /* Presumed that fcport->rport_lock is held */
qedf_get_sqe_idx(struct qedf_rport * fcport)758 u16 qedf_get_sqe_idx(struct qedf_rport *fcport)
759 {
760 uint16_t total_sqe = (fcport->sq_mem_size)/(sizeof(struct fcoe_wqe));
761 u16 rval;
762
763 rval = fcport->sq_prod_idx;
764
765 /* Adjust ring index */
766 fcport->sq_prod_idx++;
767 fcport->fw_sq_prod_idx++;
768 if (fcport->sq_prod_idx == total_sqe)
769 fcport->sq_prod_idx = 0;
770
771 return rval;
772 }
773
qedf_ring_doorbell(struct qedf_rport * fcport)774 void qedf_ring_doorbell(struct qedf_rport *fcport)
775 {
776 struct fcoe_db_data dbell = { 0 };
777
778 dbell.agg_flags = 0;
779
780 dbell.params |= DB_DEST_XCM << FCOE_DB_DATA_DEST_SHIFT;
781 dbell.params |= DB_AGG_CMD_SET << FCOE_DB_DATA_AGG_CMD_SHIFT;
782 dbell.params |= DQ_XCM_FCOE_SQ_PROD_CMD <<
783 FCOE_DB_DATA_AGG_VAL_SEL_SHIFT;
784
785 dbell.sq_prod = fcport->fw_sq_prod_idx;
786 /* wmb makes sure that the BDs data is updated before updating the
787 * producer, otherwise FW may read old data from the BDs.
788 */
789 wmb();
790 barrier();
791 writel(*(u32 *)&dbell, fcport->p_doorbell);
792 /*
793 * Fence required to flush the write combined buffer, since another
794 * CPU may write to the same doorbell address and data may be lost
795 * due to relaxed order nature of write combined bar.
796 */
797 wmb();
798 }
799
qedf_trace_io(struct qedf_rport * fcport,struct qedf_ioreq * io_req,int8_t direction)800 static void qedf_trace_io(struct qedf_rport *fcport, struct qedf_ioreq *io_req,
801 int8_t direction)
802 {
803 struct qedf_ctx *qedf = fcport->qedf;
804 struct qedf_io_log *io_log;
805 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
806 unsigned long flags;
807 uint8_t op;
808
809 spin_lock_irqsave(&qedf->io_trace_lock, flags);
810
811 io_log = &qedf->io_trace_buf[qedf->io_trace_idx];
812 io_log->direction = direction;
813 io_log->task_id = io_req->xid;
814 io_log->port_id = fcport->rdata->ids.port_id;
815 io_log->lun = sc_cmd->device->lun;
816 io_log->op = op = sc_cmd->cmnd[0];
817 io_log->lba[0] = sc_cmd->cmnd[2];
818 io_log->lba[1] = sc_cmd->cmnd[3];
819 io_log->lba[2] = sc_cmd->cmnd[4];
820 io_log->lba[3] = sc_cmd->cmnd[5];
821 io_log->bufflen = scsi_bufflen(sc_cmd);
822 io_log->sg_count = scsi_sg_count(sc_cmd);
823 io_log->result = sc_cmd->result;
824 io_log->jiffies = jiffies;
825 io_log->refcount = kref_read(&io_req->refcount);
826
827 if (direction == QEDF_IO_TRACE_REQ) {
828 /* For requests we only care abot the submission CPU */
829 io_log->req_cpu = io_req->cpu;
830 io_log->int_cpu = 0;
831 io_log->rsp_cpu = 0;
832 } else if (direction == QEDF_IO_TRACE_RSP) {
833 io_log->req_cpu = io_req->cpu;
834 io_log->int_cpu = io_req->int_cpu;
835 io_log->rsp_cpu = smp_processor_id();
836 }
837
838 io_log->sge_type = io_req->sge_type;
839
840 qedf->io_trace_idx++;
841 if (qedf->io_trace_idx == QEDF_IO_TRACE_SIZE)
842 qedf->io_trace_idx = 0;
843
844 spin_unlock_irqrestore(&qedf->io_trace_lock, flags);
845 }
846
qedf_post_io_req(struct qedf_rport * fcport,struct qedf_ioreq * io_req)847 int qedf_post_io_req(struct qedf_rport *fcport, struct qedf_ioreq *io_req)
848 {
849 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
850 struct Scsi_Host *host = sc_cmd->device->host;
851 struct fc_lport *lport = shost_priv(host);
852 struct qedf_ctx *qedf = lport_priv(lport);
853 struct e4_fcoe_task_context *task_ctx;
854 u16 xid;
855 struct fcoe_wqe *sqe;
856 u16 sqe_idx;
857
858 /* Initialize rest of io_req fileds */
859 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
860 sc_cmd->SCp.ptr = (char *)io_req;
861 io_req->sge_type = QEDF_IOREQ_FAST_SGE; /* Assume fast SGL by default */
862
863 /* Record which cpu this request is associated with */
864 io_req->cpu = smp_processor_id();
865
866 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
867 io_req->io_req_flags = QEDF_READ;
868 qedf->input_requests++;
869 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
870 io_req->io_req_flags = QEDF_WRITE;
871 qedf->output_requests++;
872 } else {
873 io_req->io_req_flags = 0;
874 qedf->control_requests++;
875 }
876
877 xid = io_req->xid;
878
879 /* Build buffer descriptor list for firmware from sg list */
880 if (qedf_build_bd_list_from_sg(io_req)) {
881 QEDF_ERR(&(qedf->dbg_ctx), "BD list creation failed.\n");
882 /* Release cmd will release io_req, but sc_cmd is assigned */
883 io_req->sc_cmd = NULL;
884 kref_put(&io_req->refcount, qedf_release_cmd);
885 return -EAGAIN;
886 }
887
888 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
889 test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
890 QEDF_ERR(&(qedf->dbg_ctx), "Session not offloaded yet.\n");
891 /* Release cmd will release io_req, but sc_cmd is assigned */
892 io_req->sc_cmd = NULL;
893 kref_put(&io_req->refcount, qedf_release_cmd);
894 return -EINVAL;
895 }
896
897 /* Record LUN number for later use if we neeed them */
898 io_req->lun = (int)sc_cmd->device->lun;
899
900 /* Obtain free SQE */
901 sqe_idx = qedf_get_sqe_idx(fcport);
902 sqe = &fcport->sq[sqe_idx];
903 memset(sqe, 0, sizeof(struct fcoe_wqe));
904
905 /* Get the task context */
906 task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
907 if (!task_ctx) {
908 QEDF_WARN(&(qedf->dbg_ctx), "task_ctx is NULL, xid=%d.\n",
909 xid);
910 /* Release cmd will release io_req, but sc_cmd is assigned */
911 io_req->sc_cmd = NULL;
912 kref_put(&io_req->refcount, qedf_release_cmd);
913 return -EINVAL;
914 }
915
916 qedf_init_task(fcport, lport, io_req, task_ctx, sqe);
917
918 /* Ring doorbell */
919 qedf_ring_doorbell(fcport);
920
921 /* Set that command is with the firmware now */
922 set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
923
924 if (qedf_io_tracing && io_req->sc_cmd)
925 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_REQ);
926
927 return false;
928 }
929
930 int
qedf_queuecommand(struct Scsi_Host * host,struct scsi_cmnd * sc_cmd)931 qedf_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc_cmd)
932 {
933 struct fc_lport *lport = shost_priv(host);
934 struct qedf_ctx *qedf = lport_priv(lport);
935 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
936 struct fc_rport_libfc_priv *rp = rport->dd_data;
937 struct qedf_rport *fcport;
938 struct qedf_ioreq *io_req;
939 int rc = 0;
940 int rval;
941 unsigned long flags = 0;
942 int num_sgs = 0;
943
944 num_sgs = scsi_sg_count(sc_cmd);
945 if (scsi_sg_count(sc_cmd) > QEDF_MAX_BDS_PER_CMD) {
946 QEDF_ERR(&qedf->dbg_ctx,
947 "Number of SG elements %d exceeds what hardware limitation of %d.\n",
948 num_sgs, QEDF_MAX_BDS_PER_CMD);
949 sc_cmd->result = DID_ERROR;
950 sc_cmd->scsi_done(sc_cmd);
951 return 0;
952 }
953
954 if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
955 test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
956 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
957 "Returning DNC as unloading or stop io, flags 0x%lx.\n",
958 qedf->flags);
959 sc_cmd->result = DID_NO_CONNECT << 16;
960 sc_cmd->scsi_done(sc_cmd);
961 return 0;
962 }
963
964 if (!qedf->pdev->msix_enabled) {
965 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
966 "Completing sc_cmd=%p DID_NO_CONNECT as MSI-X is not enabled.\n",
967 sc_cmd);
968 sc_cmd->result = DID_NO_CONNECT << 16;
969 sc_cmd->scsi_done(sc_cmd);
970 return 0;
971 }
972
973 rval = fc_remote_port_chkready(rport);
974 if (rval) {
975 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
976 "fc_remote_port_chkready failed=0x%x for port_id=0x%06x.\n",
977 rval, rport->port_id);
978 sc_cmd->result = rval;
979 sc_cmd->scsi_done(sc_cmd);
980 return 0;
981 }
982
983 /* Retry command if we are doing a qed drain operation */
984 if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
985 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Drain active.\n");
986 rc = SCSI_MLQUEUE_HOST_BUSY;
987 goto exit_qcmd;
988 }
989
990 if (lport->state != LPORT_ST_READY ||
991 atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
992 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Link down.\n");
993 rc = SCSI_MLQUEUE_HOST_BUSY;
994 goto exit_qcmd;
995 }
996
997 /* rport and tgt are allocated together, so tgt should be non-NULL */
998 fcport = (struct qedf_rport *)&rp[1];
999
1000 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
1001 test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
1002 /*
1003 * Session is not offloaded yet. Let SCSI-ml retry
1004 * the command.
1005 */
1006 rc = SCSI_MLQUEUE_TARGET_BUSY;
1007 goto exit_qcmd;
1008 }
1009
1010 atomic_inc(&fcport->ios_to_queue);
1011
1012 if (fcport->retry_delay_timestamp) {
1013 /* Take fcport->rport_lock for resetting the delay_timestamp */
1014 spin_lock_irqsave(&fcport->rport_lock, flags);
1015 if (time_after(jiffies, fcport->retry_delay_timestamp)) {
1016 fcport->retry_delay_timestamp = 0;
1017 } else {
1018 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1019 /* If retry_delay timer is active, flow off the ML */
1020 rc = SCSI_MLQUEUE_TARGET_BUSY;
1021 atomic_dec(&fcport->ios_to_queue);
1022 goto exit_qcmd;
1023 }
1024 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1025 }
1026
1027 io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
1028 if (!io_req) {
1029 rc = SCSI_MLQUEUE_HOST_BUSY;
1030 atomic_dec(&fcport->ios_to_queue);
1031 goto exit_qcmd;
1032 }
1033
1034 io_req->sc_cmd = sc_cmd;
1035
1036 /* Take fcport->rport_lock for posting to fcport send queue */
1037 spin_lock_irqsave(&fcport->rport_lock, flags);
1038 if (qedf_post_io_req(fcport, io_req)) {
1039 QEDF_WARN(&(qedf->dbg_ctx), "Unable to post io_req\n");
1040 /* Return SQE to pool */
1041 atomic_inc(&fcport->free_sqes);
1042 rc = SCSI_MLQUEUE_HOST_BUSY;
1043 }
1044 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1045 atomic_dec(&fcport->ios_to_queue);
1046
1047 exit_qcmd:
1048 return rc;
1049 }
1050
qedf_parse_fcp_rsp(struct qedf_ioreq * io_req,struct fcoe_cqe_rsp_info * fcp_rsp)1051 static void qedf_parse_fcp_rsp(struct qedf_ioreq *io_req,
1052 struct fcoe_cqe_rsp_info *fcp_rsp)
1053 {
1054 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1055 struct qedf_ctx *qedf = io_req->fcport->qedf;
1056 u8 rsp_flags = fcp_rsp->rsp_flags.flags;
1057 int fcp_sns_len = 0;
1058 int fcp_rsp_len = 0;
1059 uint8_t *rsp_info, *sense_data;
1060
1061 io_req->fcp_status = FC_GOOD;
1062 io_req->fcp_resid = 0;
1063 if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1064 FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1065 io_req->fcp_resid = fcp_rsp->fcp_resid;
1066
1067 io_req->scsi_comp_flags = rsp_flags;
1068 CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1069 fcp_rsp->scsi_status_code;
1070
1071 if (rsp_flags &
1072 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID)
1073 fcp_rsp_len = fcp_rsp->fcp_rsp_len;
1074
1075 if (rsp_flags &
1076 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID)
1077 fcp_sns_len = fcp_rsp->fcp_sns_len;
1078
1079 io_req->fcp_rsp_len = fcp_rsp_len;
1080 io_req->fcp_sns_len = fcp_sns_len;
1081 rsp_info = sense_data = io_req->sense_buffer;
1082
1083 /* fetch fcp_rsp_code */
1084 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1085 /* Only for task management function */
1086 io_req->fcp_rsp_code = rsp_info[3];
1087 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1088 "fcp_rsp_code = %d\n", io_req->fcp_rsp_code);
1089 /* Adjust sense-data location. */
1090 sense_data += fcp_rsp_len;
1091 }
1092
1093 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1094 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1095 "Truncating sense buffer\n");
1096 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1097 }
1098
1099 /* The sense buffer can be NULL for TMF commands */
1100 if (sc_cmd->sense_buffer) {
1101 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1102 if (fcp_sns_len)
1103 memcpy(sc_cmd->sense_buffer, sense_data,
1104 fcp_sns_len);
1105 }
1106 }
1107
qedf_unmap_sg_list(struct qedf_ctx * qedf,struct qedf_ioreq * io_req)1108 static void qedf_unmap_sg_list(struct qedf_ctx *qedf, struct qedf_ioreq *io_req)
1109 {
1110 struct scsi_cmnd *sc = io_req->sc_cmd;
1111
1112 if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1113 dma_unmap_sg(&qedf->pdev->dev, scsi_sglist(sc),
1114 scsi_sg_count(sc), sc->sc_data_direction);
1115 io_req->bd_tbl->bd_valid = 0;
1116 }
1117 }
1118
qedf_scsi_completion(struct qedf_ctx * qedf,struct fcoe_cqe * cqe,struct qedf_ioreq * io_req)1119 void qedf_scsi_completion(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1120 struct qedf_ioreq *io_req)
1121 {
1122 struct scsi_cmnd *sc_cmd;
1123 struct fcoe_cqe_rsp_info *fcp_rsp;
1124 struct qedf_rport *fcport;
1125 int refcount;
1126 u16 scope, qualifier = 0;
1127 u8 fw_residual_flag = 0;
1128 unsigned long flags = 0;
1129 u16 chk_scope = 0;
1130
1131 if (!io_req)
1132 return;
1133 if (!cqe)
1134 return;
1135
1136 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1137 test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags) ||
1138 test_bit(QEDF_CMD_IN_ABORT, &io_req->flags)) {
1139 QEDF_ERR(&qedf->dbg_ctx,
1140 "io_req xid=0x%x already in cleanup or abort processing or already completed.\n",
1141 io_req->xid);
1142 return;
1143 }
1144
1145 sc_cmd = io_req->sc_cmd;
1146 fcp_rsp = &cqe->cqe_info.rsp_info;
1147
1148 if (!sc_cmd) {
1149 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1150 return;
1151 }
1152
1153 if (!sc_cmd->SCp.ptr) {
1154 QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
1155 "another context.\n");
1156 return;
1157 }
1158
1159 if (!sc_cmd->device) {
1160 QEDF_ERR(&qedf->dbg_ctx,
1161 "Device for sc_cmd %p is NULL.\n", sc_cmd);
1162 return;
1163 }
1164
1165 if (!scsi_cmd_to_rq(sc_cmd)->q) {
1166 QEDF_WARN(&(qedf->dbg_ctx), "request->q is NULL so request "
1167 "is not valid, sc_cmd=%p.\n", sc_cmd);
1168 return;
1169 }
1170
1171 fcport = io_req->fcport;
1172
1173 /*
1174 * When flush is active, let the cmds be completed from the cleanup
1175 * context
1176 */
1177 if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
1178 (test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags) &&
1179 sc_cmd->device->lun == (u64)fcport->lun_reset_lun)) {
1180 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1181 "Dropping good completion xid=0x%x as fcport is flushing",
1182 io_req->xid);
1183 return;
1184 }
1185
1186 qedf_parse_fcp_rsp(io_req, fcp_rsp);
1187
1188 qedf_unmap_sg_list(qedf, io_req);
1189
1190 /* Check for FCP transport error */
1191 if (io_req->fcp_rsp_len > 3 && io_req->fcp_rsp_code) {
1192 QEDF_ERR(&(qedf->dbg_ctx),
1193 "FCP I/O protocol failure xid=0x%x fcp_rsp_len=%d "
1194 "fcp_rsp_code=%d.\n", io_req->xid, io_req->fcp_rsp_len,
1195 io_req->fcp_rsp_code);
1196 sc_cmd->result = DID_BUS_BUSY << 16;
1197 goto out;
1198 }
1199
1200 fw_residual_flag = GET_FIELD(cqe->cqe_info.rsp_info.fw_error_flags,
1201 FCOE_CQE_RSP_INFO_FW_UNDERRUN);
1202 if (fw_residual_flag) {
1203 QEDF_ERR(&qedf->dbg_ctx,
1204 "Firmware detected underrun: xid=0x%x fcp_rsp.flags=0x%02x fcp_resid=%d fw_residual=0x%x lba=%02x%02x%02x%02x.\n",
1205 io_req->xid, fcp_rsp->rsp_flags.flags,
1206 io_req->fcp_resid,
1207 cqe->cqe_info.rsp_info.fw_residual, sc_cmd->cmnd[2],
1208 sc_cmd->cmnd[3], sc_cmd->cmnd[4], sc_cmd->cmnd[5]);
1209
1210 if (io_req->cdb_status == 0)
1211 sc_cmd->result = (DID_ERROR << 16) | io_req->cdb_status;
1212 else
1213 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1214
1215 /*
1216 * Set resid to the whole buffer length so we won't try to resue
1217 * any previously data.
1218 */
1219 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1220 goto out;
1221 }
1222
1223 switch (io_req->fcp_status) {
1224 case FC_GOOD:
1225 if (io_req->cdb_status == 0) {
1226 /* Good I/O completion */
1227 sc_cmd->result = DID_OK << 16;
1228 } else {
1229 refcount = kref_read(&io_req->refcount);
1230 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1231 "%d:0:%d:%lld xid=0x%0x op=0x%02x "
1232 "lba=%02x%02x%02x%02x cdb_status=%d "
1233 "fcp_resid=0x%x refcount=%d.\n",
1234 qedf->lport->host->host_no, sc_cmd->device->id,
1235 sc_cmd->device->lun, io_req->xid,
1236 sc_cmd->cmnd[0], sc_cmd->cmnd[2], sc_cmd->cmnd[3],
1237 sc_cmd->cmnd[4], sc_cmd->cmnd[5],
1238 io_req->cdb_status, io_req->fcp_resid,
1239 refcount);
1240 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1241
1242 if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1243 io_req->cdb_status == SAM_STAT_BUSY) {
1244 /*
1245 * Check whether we need to set retry_delay at
1246 * all based on retry_delay module parameter
1247 * and the status qualifier.
1248 */
1249
1250 /* Upper 2 bits */
1251 scope = fcp_rsp->retry_delay_timer & 0xC000;
1252 /* Lower 14 bits */
1253 qualifier = fcp_rsp->retry_delay_timer & 0x3FFF;
1254
1255 if (qedf_retry_delay)
1256 chk_scope = 1;
1257 /* Record stats */
1258 if (io_req->cdb_status ==
1259 SAM_STAT_TASK_SET_FULL)
1260 qedf->task_set_fulls++;
1261 else
1262 qedf->busy++;
1263 }
1264 }
1265 if (io_req->fcp_resid)
1266 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1267
1268 if (chk_scope == 1) {
1269 if ((scope == 1 || scope == 2) &&
1270 (qualifier > 0 && qualifier <= 0x3FEF)) {
1271 /* Check we don't go over the max */
1272 if (qualifier > QEDF_RETRY_DELAY_MAX) {
1273 qualifier = QEDF_RETRY_DELAY_MAX;
1274 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1275 "qualifier = %d\n",
1276 (fcp_rsp->retry_delay_timer &
1277 0x3FFF));
1278 }
1279 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1280 "Scope = %d and qualifier = %d",
1281 scope, qualifier);
1282 /* Take fcport->rport_lock to
1283 * update the retry_delay_timestamp
1284 */
1285 spin_lock_irqsave(&fcport->rport_lock, flags);
1286 fcport->retry_delay_timestamp =
1287 jiffies + (qualifier * HZ / 10);
1288 spin_unlock_irqrestore(&fcport->rport_lock,
1289 flags);
1290
1291 } else {
1292 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1293 "combination of scope = %d and qualifier = %d is not handled in qedf.\n",
1294 scope, qualifier);
1295 }
1296 }
1297 break;
1298 default:
1299 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "fcp_status=%d.\n",
1300 io_req->fcp_status);
1301 break;
1302 }
1303
1304 out:
1305 if (qedf_io_tracing)
1306 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_RSP);
1307
1308 /*
1309 * We wait till the end of the function to clear the
1310 * outstanding bit in case we need to send an abort
1311 */
1312 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
1313
1314 io_req->sc_cmd = NULL;
1315 sc_cmd->SCp.ptr = NULL;
1316 sc_cmd->scsi_done(sc_cmd);
1317 kref_put(&io_req->refcount, qedf_release_cmd);
1318 }
1319
1320 /* Return a SCSI command in some other context besides a normal completion */
qedf_scsi_done(struct qedf_ctx * qedf,struct qedf_ioreq * io_req,int result)1321 void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
1322 int result)
1323 {
1324 struct scsi_cmnd *sc_cmd;
1325 int refcount;
1326
1327 if (!io_req) {
1328 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "io_req is NULL\n");
1329 return;
1330 }
1331
1332 if (test_and_set_bit(QEDF_CMD_ERR_SCSI_DONE, &io_req->flags)) {
1333 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1334 "io_req:%p scsi_done handling already done\n",
1335 io_req);
1336 return;
1337 }
1338
1339 /*
1340 * We will be done with this command after this call so clear the
1341 * outstanding bit.
1342 */
1343 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
1344
1345 sc_cmd = io_req->sc_cmd;
1346
1347 if (!sc_cmd) {
1348 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1349 return;
1350 }
1351
1352 if (!virt_addr_valid(sc_cmd)) {
1353 QEDF_ERR(&qedf->dbg_ctx, "sc_cmd=%p is not valid.", sc_cmd);
1354 goto bad_scsi_ptr;
1355 }
1356
1357 if (!sc_cmd->SCp.ptr) {
1358 QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
1359 "another context.\n");
1360 return;
1361 }
1362
1363 if (!sc_cmd->device) {
1364 QEDF_ERR(&qedf->dbg_ctx, "Device for sc_cmd %p is NULL.\n",
1365 sc_cmd);
1366 goto bad_scsi_ptr;
1367 }
1368
1369 if (!virt_addr_valid(sc_cmd->device)) {
1370 QEDF_ERR(&qedf->dbg_ctx,
1371 "Device pointer for sc_cmd %p is bad.\n", sc_cmd);
1372 goto bad_scsi_ptr;
1373 }
1374
1375 if (!sc_cmd->sense_buffer) {
1376 QEDF_ERR(&qedf->dbg_ctx,
1377 "sc_cmd->sense_buffer for sc_cmd %p is NULL.\n",
1378 sc_cmd);
1379 goto bad_scsi_ptr;
1380 }
1381
1382 if (!virt_addr_valid(sc_cmd->sense_buffer)) {
1383 QEDF_ERR(&qedf->dbg_ctx,
1384 "sc_cmd->sense_buffer for sc_cmd %p is bad.\n",
1385 sc_cmd);
1386 goto bad_scsi_ptr;
1387 }
1388
1389 if (!sc_cmd->scsi_done) {
1390 QEDF_ERR(&qedf->dbg_ctx,
1391 "sc_cmd->scsi_done for sc_cmd %p is NULL.\n",
1392 sc_cmd);
1393 goto bad_scsi_ptr;
1394 }
1395
1396 qedf_unmap_sg_list(qedf, io_req);
1397
1398 sc_cmd->result = result << 16;
1399 refcount = kref_read(&io_req->refcount);
1400 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "%d:0:%d:%lld: Completing "
1401 "sc_cmd=%p result=0x%08x op=0x%02x lba=0x%02x%02x%02x%02x, "
1402 "allowed=%d retries=%d refcount=%d.\n",
1403 qedf->lport->host->host_no, sc_cmd->device->id,
1404 sc_cmd->device->lun, sc_cmd, sc_cmd->result, sc_cmd->cmnd[0],
1405 sc_cmd->cmnd[2], sc_cmd->cmnd[3], sc_cmd->cmnd[4],
1406 sc_cmd->cmnd[5], sc_cmd->allowed, sc_cmd->retries,
1407 refcount);
1408
1409 /*
1410 * Set resid to the whole buffer length so we won't try to resue any
1411 * previously read data
1412 */
1413 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1414
1415 if (qedf_io_tracing)
1416 qedf_trace_io(io_req->fcport, io_req, QEDF_IO_TRACE_RSP);
1417
1418 io_req->sc_cmd = NULL;
1419 sc_cmd->SCp.ptr = NULL;
1420 sc_cmd->scsi_done(sc_cmd);
1421 kref_put(&io_req->refcount, qedf_release_cmd);
1422 return;
1423
1424 bad_scsi_ptr:
1425 /*
1426 * Clear the io_req->sc_cmd backpointer so we don't try to process
1427 * this again
1428 */
1429 io_req->sc_cmd = NULL;
1430 kref_put(&io_req->refcount, qedf_release_cmd); /* ID: 001 */
1431 }
1432
1433 /*
1434 * Handle warning type CQE completions. This is mainly used for REC timer
1435 * popping.
1436 */
qedf_process_warning_compl(struct qedf_ctx * qedf,struct fcoe_cqe * cqe,struct qedf_ioreq * io_req)1437 void qedf_process_warning_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1438 struct qedf_ioreq *io_req)
1439 {
1440 int rval, i;
1441 struct qedf_rport *fcport = io_req->fcport;
1442 u64 err_warn_bit_map;
1443 u8 err_warn = 0xff;
1444
1445 if (!cqe) {
1446 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1447 "cqe is NULL for io_req %p xid=0x%x\n",
1448 io_req, io_req->xid);
1449 return;
1450 }
1451
1452 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Warning CQE, "
1453 "xid=0x%x\n", io_req->xid);
1454 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1455 "err_warn_bitmap=%08x:%08x\n",
1456 le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1457 le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1458 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1459 "rx_buff_off=%08x, rx_id=%04x\n",
1460 le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1461 le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1462 le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1463
1464 /* Normalize the error bitmap value to an just an unsigned int */
1465 err_warn_bit_map = (u64)
1466 ((u64)cqe->cqe_info.err_info.err_warn_bitmap_hi << 32) |
1467 (u64)cqe->cqe_info.err_info.err_warn_bitmap_lo;
1468 for (i = 0; i < 64; i++) {
1469 if (err_warn_bit_map & (u64)((u64)1 << i)) {
1470 err_warn = i;
1471 break;
1472 }
1473 }
1474
1475 /* Check if REC TOV expired if this is a tape device */
1476 if (fcport->dev_type == QEDF_RPORT_TYPE_TAPE) {
1477 if (err_warn ==
1478 FCOE_WARNING_CODE_REC_TOV_TIMER_EXPIRATION) {
1479 QEDF_ERR(&(qedf->dbg_ctx), "REC timer expired.\n");
1480 if (!test_bit(QEDF_CMD_SRR_SENT, &io_req->flags)) {
1481 io_req->rx_buf_off =
1482 cqe->cqe_info.err_info.rx_buf_off;
1483 io_req->tx_buf_off =
1484 cqe->cqe_info.err_info.tx_buf_off;
1485 io_req->rx_id = cqe->cqe_info.err_info.rx_id;
1486 rval = qedf_send_rec(io_req);
1487 /*
1488 * We only want to abort the io_req if we
1489 * can't queue the REC command as we want to
1490 * keep the exchange open for recovery.
1491 */
1492 if (rval)
1493 goto send_abort;
1494 }
1495 return;
1496 }
1497 }
1498
1499 send_abort:
1500 init_completion(&io_req->abts_done);
1501 rval = qedf_initiate_abts(io_req, true);
1502 if (rval)
1503 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1504 }
1505
1506 /* Cleanup a command when we receive an error detection completion */
qedf_process_error_detect(struct qedf_ctx * qedf,struct fcoe_cqe * cqe,struct qedf_ioreq * io_req)1507 void qedf_process_error_detect(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1508 struct qedf_ioreq *io_req)
1509 {
1510 int rval;
1511
1512 if (io_req == NULL) {
1513 QEDF_INFO(NULL, QEDF_LOG_IO, "io_req is NULL.\n");
1514 return;
1515 }
1516
1517 if (io_req->fcport == NULL) {
1518 QEDF_INFO(NULL, QEDF_LOG_IO, "fcport is NULL.\n");
1519 return;
1520 }
1521
1522 if (!cqe) {
1523 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1524 "cqe is NULL for io_req %p\n", io_req);
1525 return;
1526 }
1527
1528 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Error detection CQE, "
1529 "xid=0x%x\n", io_req->xid);
1530 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1531 "err_warn_bitmap=%08x:%08x\n",
1532 le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1533 le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1534 QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1535 "rx_buff_off=%08x, rx_id=%04x\n",
1536 le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1537 le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1538 le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1539
1540 /* When flush is active, let the cmds be flushed out from the cleanup context */
1541 if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &io_req->fcport->flags) ||
1542 (test_bit(QEDF_RPORT_IN_LUN_RESET, &io_req->fcport->flags) &&
1543 io_req->sc_cmd->device->lun == (u64)io_req->fcport->lun_reset_lun)) {
1544 QEDF_ERR(&qedf->dbg_ctx,
1545 "Dropping EQE for xid=0x%x as fcport is flushing",
1546 io_req->xid);
1547 return;
1548 }
1549
1550 if (qedf->stop_io_on_error) {
1551 qedf_stop_all_io(qedf);
1552 return;
1553 }
1554
1555 init_completion(&io_req->abts_done);
1556 rval = qedf_initiate_abts(io_req, true);
1557 if (rval)
1558 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1559 }
1560
qedf_flush_els_req(struct qedf_ctx * qedf,struct qedf_ioreq * els_req)1561 static void qedf_flush_els_req(struct qedf_ctx *qedf,
1562 struct qedf_ioreq *els_req)
1563 {
1564 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1565 "Flushing ELS request xid=0x%x refcount=%d.\n", els_req->xid,
1566 kref_read(&els_req->refcount));
1567
1568 /*
1569 * Need to distinguish this from a timeout when calling the
1570 * els_req->cb_func.
1571 */
1572 els_req->event = QEDF_IOREQ_EV_ELS_FLUSH;
1573
1574 clear_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
1575
1576 /* Cancel the timer */
1577 cancel_delayed_work_sync(&els_req->timeout_work);
1578
1579 /* Call callback function to complete command */
1580 if (els_req->cb_func && els_req->cb_arg) {
1581 els_req->cb_func(els_req->cb_arg);
1582 els_req->cb_arg = NULL;
1583 }
1584
1585 /* Release kref for original initiate_els */
1586 kref_put(&els_req->refcount, qedf_release_cmd);
1587 }
1588
1589 /* A value of -1 for lun is a wild card that means flush all
1590 * active SCSI I/Os for the target.
1591 */
qedf_flush_active_ios(struct qedf_rport * fcport,int lun)1592 void qedf_flush_active_ios(struct qedf_rport *fcport, int lun)
1593 {
1594 struct qedf_ioreq *io_req;
1595 struct qedf_ctx *qedf;
1596 struct qedf_cmd_mgr *cmd_mgr;
1597 int i, rc;
1598 unsigned long flags;
1599 int flush_cnt = 0;
1600 int wait_cnt = 100;
1601 int refcount = 0;
1602
1603 if (!fcport) {
1604 QEDF_ERR(NULL, "fcport is NULL\n");
1605 return;
1606 }
1607
1608 /* Check that fcport is still offloaded */
1609 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1610 QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
1611 return;
1612 }
1613
1614 qedf = fcport->qedf;
1615
1616 if (!qedf) {
1617 QEDF_ERR(NULL, "qedf is NULL.\n");
1618 return;
1619 }
1620
1621 /* Only wait for all commands to be queued in the Upload context */
1622 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags) &&
1623 (lun == -1)) {
1624 while (atomic_read(&fcport->ios_to_queue)) {
1625 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1626 "Waiting for %d I/Os to be queued\n",
1627 atomic_read(&fcport->ios_to_queue));
1628 if (wait_cnt == 0) {
1629 QEDF_ERR(NULL,
1630 "%d IOs request could not be queued\n",
1631 atomic_read(&fcport->ios_to_queue));
1632 }
1633 msleep(20);
1634 wait_cnt--;
1635 }
1636 }
1637
1638 cmd_mgr = qedf->cmd_mgr;
1639
1640 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1641 "Flush active i/o's num=0x%x fcport=0x%p port_id=0x%06x scsi_id=%d.\n",
1642 atomic_read(&fcport->num_active_ios), fcport,
1643 fcport->rdata->ids.port_id, fcport->rport->scsi_target_id);
1644 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Locking flush mutex.\n");
1645
1646 mutex_lock(&qedf->flush_mutex);
1647 if (lun == -1) {
1648 set_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags);
1649 } else {
1650 set_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags);
1651 fcport->lun_reset_lun = lun;
1652 }
1653
1654 for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1655 io_req = &cmd_mgr->cmds[i];
1656
1657 if (!io_req)
1658 continue;
1659 if (!io_req->fcport)
1660 continue;
1661
1662 spin_lock_irqsave(&cmd_mgr->lock, flags);
1663
1664 if (io_req->alloc) {
1665 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags)) {
1666 if (io_req->cmd_type == QEDF_SCSI_CMD)
1667 QEDF_ERR(&qedf->dbg_ctx,
1668 "Allocated but not queued, xid=0x%x\n",
1669 io_req->xid);
1670 }
1671 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
1672 } else {
1673 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
1674 continue;
1675 }
1676
1677 if (io_req->fcport != fcport)
1678 continue;
1679
1680 /* In case of ABTS, CMD_OUTSTANDING is cleared on ABTS response,
1681 * but RRQ is still pending.
1682 * Workaround: Within qedf_send_rrq, we check if the fcport is
1683 * NULL, and we drop the ref on the io_req to clean it up.
1684 */
1685 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags)) {
1686 refcount = kref_read(&io_req->refcount);
1687 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1688 "Not outstanding, xid=0x%x, cmd_type=%d refcount=%d.\n",
1689 io_req->xid, io_req->cmd_type, refcount);
1690 /* If RRQ work has been queue, try to cancel it and
1691 * free the io_req
1692 */
1693 if (atomic_read(&io_req->state) ==
1694 QEDFC_CMD_ST_RRQ_WAIT) {
1695 if (cancel_delayed_work_sync
1696 (&io_req->rrq_work)) {
1697 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1698 "Putting reference for pending RRQ work xid=0x%x.\n",
1699 io_req->xid);
1700 /* ID: 003 */
1701 kref_put(&io_req->refcount,
1702 qedf_release_cmd);
1703 }
1704 }
1705 continue;
1706 }
1707
1708 /* Only consider flushing ELS during target reset */
1709 if (io_req->cmd_type == QEDF_ELS &&
1710 lun == -1) {
1711 rc = kref_get_unless_zero(&io_req->refcount);
1712 if (!rc) {
1713 QEDF_ERR(&(qedf->dbg_ctx),
1714 "Could not get kref for ELS io_req=0x%p xid=0x%x.\n",
1715 io_req, io_req->xid);
1716 continue;
1717 }
1718 qedf_initiate_cleanup(io_req, false);
1719 flush_cnt++;
1720 qedf_flush_els_req(qedf, io_req);
1721
1722 /*
1723 * Release the kref and go back to the top of the
1724 * loop.
1725 */
1726 goto free_cmd;
1727 }
1728
1729 if (io_req->cmd_type == QEDF_ABTS) {
1730 /* ID: 004 */
1731 rc = kref_get_unless_zero(&io_req->refcount);
1732 if (!rc) {
1733 QEDF_ERR(&(qedf->dbg_ctx),
1734 "Could not get kref for abort io_req=0x%p xid=0x%x.\n",
1735 io_req, io_req->xid);
1736 continue;
1737 }
1738 if (lun != -1 && io_req->lun != lun)
1739 goto free_cmd;
1740
1741 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1742 "Flushing abort xid=0x%x.\n", io_req->xid);
1743
1744 if (cancel_delayed_work_sync(&io_req->rrq_work)) {
1745 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1746 "Putting ref for cancelled RRQ work xid=0x%x.\n",
1747 io_req->xid);
1748 kref_put(&io_req->refcount, qedf_release_cmd);
1749 }
1750
1751 if (cancel_delayed_work_sync(&io_req->timeout_work)) {
1752 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1753 "Putting ref for cancelled tmo work xid=0x%x.\n",
1754 io_req->xid);
1755 qedf_initiate_cleanup(io_req, true);
1756 /* Notify eh_abort handler that ABTS is
1757 * complete
1758 */
1759 complete(&io_req->abts_done);
1760 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1761 /* ID: 002 */
1762 kref_put(&io_req->refcount, qedf_release_cmd);
1763 }
1764 flush_cnt++;
1765 goto free_cmd;
1766 }
1767
1768 if (!io_req->sc_cmd)
1769 continue;
1770 if (!io_req->sc_cmd->device) {
1771 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1772 "Device backpointer NULL for sc_cmd=%p.\n",
1773 io_req->sc_cmd);
1774 /* Put reference for non-existent scsi_cmnd */
1775 io_req->sc_cmd = NULL;
1776 qedf_initiate_cleanup(io_req, false);
1777 kref_put(&io_req->refcount, qedf_release_cmd);
1778 continue;
1779 }
1780 if (lun > -1) {
1781 if (io_req->lun != lun)
1782 continue;
1783 }
1784
1785 /*
1786 * Use kref_get_unless_zero in the unlikely case the command
1787 * we're about to flush was completed in the normal SCSI path
1788 */
1789 rc = kref_get_unless_zero(&io_req->refcount);
1790 if (!rc) {
1791 QEDF_ERR(&(qedf->dbg_ctx), "Could not get kref for "
1792 "io_req=0x%p xid=0x%x\n", io_req, io_req->xid);
1793 continue;
1794 }
1795
1796 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1797 "Cleanup xid=0x%x.\n", io_req->xid);
1798 flush_cnt++;
1799
1800 /* Cleanup task and return I/O mid-layer */
1801 qedf_initiate_cleanup(io_req, true);
1802
1803 free_cmd:
1804 kref_put(&io_req->refcount, qedf_release_cmd); /* ID: 004 */
1805 }
1806
1807 wait_cnt = 60;
1808 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1809 "Flushed 0x%x I/Os, active=0x%x.\n",
1810 flush_cnt, atomic_read(&fcport->num_active_ios));
1811 /* Only wait for all commands to complete in the Upload context */
1812 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags) &&
1813 (lun == -1)) {
1814 while (atomic_read(&fcport->num_active_ios)) {
1815 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1816 "Flushed 0x%x I/Os, active=0x%x cnt=%d.\n",
1817 flush_cnt,
1818 atomic_read(&fcport->num_active_ios),
1819 wait_cnt);
1820 if (wait_cnt == 0) {
1821 QEDF_ERR(&qedf->dbg_ctx,
1822 "Flushed %d I/Os, active=%d.\n",
1823 flush_cnt,
1824 atomic_read(&fcport->num_active_ios));
1825 for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1826 io_req = &cmd_mgr->cmds[i];
1827 if (io_req->fcport &&
1828 io_req->fcport == fcport) {
1829 refcount =
1830 kref_read(&io_req->refcount);
1831 set_bit(QEDF_CMD_DIRTY,
1832 &io_req->flags);
1833 QEDF_ERR(&qedf->dbg_ctx,
1834 "Outstanding io_req =%p xid=0x%x flags=0x%lx, sc_cmd=%p refcount=%d cmd_type=%d.\n",
1835 io_req, io_req->xid,
1836 io_req->flags,
1837 io_req->sc_cmd,
1838 refcount,
1839 io_req->cmd_type);
1840 }
1841 }
1842 WARN_ON(1);
1843 break;
1844 }
1845 msleep(500);
1846 wait_cnt--;
1847 }
1848 }
1849
1850 clear_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags);
1851 clear_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags);
1852 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Unlocking flush mutex.\n");
1853 mutex_unlock(&qedf->flush_mutex);
1854 }
1855
1856 /*
1857 * Initiate a ABTS middle path command. Note that we don't have to initialize
1858 * the task context for an ABTS task.
1859 */
qedf_initiate_abts(struct qedf_ioreq * io_req,bool return_scsi_cmd_on_abts)1860 int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
1861 {
1862 struct fc_lport *lport;
1863 struct qedf_rport *fcport = io_req->fcport;
1864 struct fc_rport_priv *rdata;
1865 struct qedf_ctx *qedf;
1866 u16 xid;
1867 int rc = 0;
1868 unsigned long flags;
1869 struct fcoe_wqe *sqe;
1870 u16 sqe_idx;
1871 int refcount = 0;
1872
1873 /* Sanity check qedf_rport before dereferencing any pointers */
1874 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1875 QEDF_ERR(NULL, "tgt not offloaded\n");
1876 rc = 1;
1877 goto out;
1878 }
1879
1880 qedf = fcport->qedf;
1881 rdata = fcport->rdata;
1882
1883 if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
1884 QEDF_ERR(&qedf->dbg_ctx, "stale rport\n");
1885 rc = 1;
1886 goto out;
1887 }
1888
1889 lport = qedf->lport;
1890
1891 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
1892 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
1893 rc = 1;
1894 goto drop_rdata_kref;
1895 }
1896
1897 if (atomic_read(&qedf->link_down_tmo_valid) > 0) {
1898 QEDF_ERR(&(qedf->dbg_ctx), "link_down_tmo active.\n");
1899 rc = 1;
1900 goto drop_rdata_kref;
1901 }
1902
1903 /* Ensure room on SQ */
1904 if (!atomic_read(&fcport->free_sqes)) {
1905 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
1906 rc = 1;
1907 goto drop_rdata_kref;
1908 }
1909
1910 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
1911 QEDF_ERR(&qedf->dbg_ctx, "fcport is uploading.\n");
1912 rc = 1;
1913 goto drop_rdata_kref;
1914 }
1915
1916 spin_lock_irqsave(&fcport->rport_lock, flags);
1917 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1918 test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags) ||
1919 test_bit(QEDF_CMD_IN_ABORT, &io_req->flags)) {
1920 QEDF_ERR(&qedf->dbg_ctx,
1921 "io_req xid=0x%x sc_cmd=%p already in cleanup or abort processing or already completed.\n",
1922 io_req->xid, io_req->sc_cmd);
1923 rc = 1;
1924 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1925 goto drop_rdata_kref;
1926 }
1927
1928 /* Set the command type to abort */
1929 io_req->cmd_type = QEDF_ABTS;
1930 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1931
1932 kref_get(&io_req->refcount);
1933
1934 xid = io_req->xid;
1935 qedf->control_requests++;
1936 qedf->packet_aborts++;
1937
1938 io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
1939
1940 set_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1941 refcount = kref_read(&io_req->refcount);
1942 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
1943 "ABTS io_req xid = 0x%x refcount=%d\n",
1944 xid, refcount);
1945
1946 qedf_cmd_timer_set(qedf, io_req, QEDF_ABORT_TIMEOUT);
1947
1948 spin_lock_irqsave(&fcport->rport_lock, flags);
1949
1950 sqe_idx = qedf_get_sqe_idx(fcport);
1951 sqe = &fcport->sq[sqe_idx];
1952 memset(sqe, 0, sizeof(struct fcoe_wqe));
1953 io_req->task_params->sqe = sqe;
1954
1955 init_initiator_abort_fcoe_task(io_req->task_params);
1956 qedf_ring_doorbell(fcport);
1957
1958 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1959
1960 drop_rdata_kref:
1961 kref_put(&rdata->kref, fc_rport_destroy);
1962 out:
1963 return rc;
1964 }
1965
qedf_process_abts_compl(struct qedf_ctx * qedf,struct fcoe_cqe * cqe,struct qedf_ioreq * io_req)1966 void qedf_process_abts_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1967 struct qedf_ioreq *io_req)
1968 {
1969 uint32_t r_ctl;
1970 int rc;
1971 struct qedf_rport *fcport = io_req->fcport;
1972
1973 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "Entered with xid = "
1974 "0x%x cmd_type = %d\n", io_req->xid, io_req->cmd_type);
1975
1976 r_ctl = cqe->cqe_info.abts_info.r_ctl;
1977
1978 /* This was added at a point when we were scheduling abts_compl &
1979 * cleanup_compl on different CPUs and there was a possibility of
1980 * the io_req to be freed from the other context before we got here.
1981 */
1982 if (!fcport) {
1983 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1984 "Dropping ABTS completion xid=0x%x as fcport is NULL",
1985 io_req->xid);
1986 return;
1987 }
1988
1989 /*
1990 * When flush is active, let the cmds be completed from the cleanup
1991 * context
1992 */
1993 if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
1994 test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags)) {
1995 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1996 "Dropping ABTS completion xid=0x%x as fcport is flushing",
1997 io_req->xid);
1998 return;
1999 }
2000
2001 if (!cancel_delayed_work(&io_req->timeout_work)) {
2002 QEDF_ERR(&qedf->dbg_ctx,
2003 "Wasn't able to cancel abts timeout work.\n");
2004 }
2005
2006 switch (r_ctl) {
2007 case FC_RCTL_BA_ACC:
2008 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
2009 "ABTS response - ACC Send RRQ after R_A_TOV\n");
2010 io_req->event = QEDF_IOREQ_EV_ABORT_SUCCESS;
2011 rc = kref_get_unless_zero(&io_req->refcount); /* ID: 003 */
2012 if (!rc) {
2013 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2014 "kref is already zero so ABTS was already completed or flushed xid=0x%x.\n",
2015 io_req->xid);
2016 return;
2017 }
2018 /*
2019 * Dont release this cmd yet. It will be relesed
2020 * after we get RRQ response
2021 */
2022 queue_delayed_work(qedf->dpc_wq, &io_req->rrq_work,
2023 msecs_to_jiffies(qedf->lport->r_a_tov));
2024 atomic_set(&io_req->state, QEDFC_CMD_ST_RRQ_WAIT);
2025 break;
2026 /* For error cases let the cleanup return the command */
2027 case FC_RCTL_BA_RJT:
2028 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
2029 "ABTS response - RJT\n");
2030 io_req->event = QEDF_IOREQ_EV_ABORT_FAILED;
2031 break;
2032 default:
2033 QEDF_ERR(&(qedf->dbg_ctx), "Unknown ABTS response\n");
2034 break;
2035 }
2036
2037 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
2038
2039 if (io_req->sc_cmd) {
2040 if (!io_req->return_scsi_cmd_on_abts)
2041 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2042 "Not call scsi_done for xid=0x%x.\n",
2043 io_req->xid);
2044 if (io_req->return_scsi_cmd_on_abts)
2045 qedf_scsi_done(qedf, io_req, DID_ERROR);
2046 }
2047
2048 /* Notify eh_abort handler that ABTS is complete */
2049 complete(&io_req->abts_done);
2050
2051 kref_put(&io_req->refcount, qedf_release_cmd);
2052 }
2053
qedf_init_mp_req(struct qedf_ioreq * io_req)2054 int qedf_init_mp_req(struct qedf_ioreq *io_req)
2055 {
2056 struct qedf_mp_req *mp_req;
2057 struct scsi_sge *mp_req_bd;
2058 struct scsi_sge *mp_resp_bd;
2059 struct qedf_ctx *qedf = io_req->fcport->qedf;
2060 dma_addr_t addr;
2061 uint64_t sz;
2062
2063 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_MP_REQ, "Entered.\n");
2064
2065 mp_req = (struct qedf_mp_req *)&(io_req->mp_req);
2066 memset(mp_req, 0, sizeof(struct qedf_mp_req));
2067
2068 if (io_req->cmd_type != QEDF_ELS) {
2069 mp_req->req_len = sizeof(struct fcp_cmnd);
2070 io_req->data_xfer_len = mp_req->req_len;
2071 } else
2072 mp_req->req_len = io_req->data_xfer_len;
2073
2074 mp_req->req_buf = dma_alloc_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
2075 &mp_req->req_buf_dma, GFP_KERNEL);
2076 if (!mp_req->req_buf) {
2077 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req buffer\n");
2078 qedf_free_mp_resc(io_req);
2079 return -ENOMEM;
2080 }
2081
2082 mp_req->resp_buf = dma_alloc_coherent(&qedf->pdev->dev,
2083 QEDF_PAGE_SIZE, &mp_req->resp_buf_dma, GFP_KERNEL);
2084 if (!mp_req->resp_buf) {
2085 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc TM resp "
2086 "buffer\n");
2087 qedf_free_mp_resc(io_req);
2088 return -ENOMEM;
2089 }
2090
2091 /* Allocate and map mp_req_bd and mp_resp_bd */
2092 sz = sizeof(struct scsi_sge);
2093 mp_req->mp_req_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
2094 &mp_req->mp_req_bd_dma, GFP_KERNEL);
2095 if (!mp_req->mp_req_bd) {
2096 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req bd\n");
2097 qedf_free_mp_resc(io_req);
2098 return -ENOMEM;
2099 }
2100
2101 mp_req->mp_resp_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
2102 &mp_req->mp_resp_bd_dma, GFP_KERNEL);
2103 if (!mp_req->mp_resp_bd) {
2104 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP resp bd\n");
2105 qedf_free_mp_resc(io_req);
2106 return -ENOMEM;
2107 }
2108
2109 /* Fill bd table */
2110 addr = mp_req->req_buf_dma;
2111 mp_req_bd = mp_req->mp_req_bd;
2112 mp_req_bd->sge_addr.lo = U64_LO(addr);
2113 mp_req_bd->sge_addr.hi = U64_HI(addr);
2114 mp_req_bd->sge_len = QEDF_PAGE_SIZE;
2115
2116 /*
2117 * MP buffer is either a task mgmt command or an ELS.
2118 * So the assumption is that it consumes a single bd
2119 * entry in the bd table
2120 */
2121 mp_resp_bd = mp_req->mp_resp_bd;
2122 addr = mp_req->resp_buf_dma;
2123 mp_resp_bd->sge_addr.lo = U64_LO(addr);
2124 mp_resp_bd->sge_addr.hi = U64_HI(addr);
2125 mp_resp_bd->sge_len = QEDF_PAGE_SIZE;
2126
2127 return 0;
2128 }
2129
2130 /*
2131 * Last ditch effort to clear the port if it's stuck. Used only after a
2132 * cleanup task times out.
2133 */
qedf_drain_request(struct qedf_ctx * qedf)2134 static void qedf_drain_request(struct qedf_ctx *qedf)
2135 {
2136 if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
2137 QEDF_ERR(&(qedf->dbg_ctx), "MCP drain already active.\n");
2138 return;
2139 }
2140
2141 /* Set bit to return all queuecommand requests as busy */
2142 set_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
2143
2144 /* Call qed drain request for function. Should be synchronous */
2145 qed_ops->common->drain(qedf->cdev);
2146
2147 /* Settle time for CQEs to be returned */
2148 msleep(100);
2149
2150 /* Unplug and continue */
2151 clear_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
2152 }
2153
2154 /*
2155 * Returns SUCCESS if the cleanup task does not timeout, otherwise return
2156 * FAILURE.
2157 */
qedf_initiate_cleanup(struct qedf_ioreq * io_req,bool return_scsi_cmd_on_abts)2158 int qedf_initiate_cleanup(struct qedf_ioreq *io_req,
2159 bool return_scsi_cmd_on_abts)
2160 {
2161 struct qedf_rport *fcport;
2162 struct qedf_ctx *qedf;
2163 int tmo = 0;
2164 int rc = SUCCESS;
2165 unsigned long flags;
2166 struct fcoe_wqe *sqe;
2167 u16 sqe_idx;
2168 int refcount = 0;
2169
2170 fcport = io_req->fcport;
2171 if (!fcport) {
2172 QEDF_ERR(NULL, "fcport is NULL.\n");
2173 return SUCCESS;
2174 }
2175
2176 /* Sanity check qedf_rport before dereferencing any pointers */
2177 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
2178 QEDF_ERR(NULL, "tgt not offloaded\n");
2179 return SUCCESS;
2180 }
2181
2182 qedf = fcport->qedf;
2183 if (!qedf) {
2184 QEDF_ERR(NULL, "qedf is NULL.\n");
2185 return SUCCESS;
2186 }
2187
2188 if (io_req->cmd_type == QEDF_ELS) {
2189 goto process_els;
2190 }
2191
2192 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
2193 test_and_set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags)) {
2194 QEDF_ERR(&(qedf->dbg_ctx), "io_req xid=0x%x already in "
2195 "cleanup processing or already completed.\n",
2196 io_req->xid);
2197 return SUCCESS;
2198 }
2199 set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2200
2201 process_els:
2202 /* Ensure room on SQ */
2203 if (!atomic_read(&fcport->free_sqes)) {
2204 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
2205 /* Need to make sure we clear the flag since it was set */
2206 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2207 return FAILED;
2208 }
2209
2210 if (io_req->cmd_type == QEDF_CLEANUP) {
2211 QEDF_ERR(&qedf->dbg_ctx,
2212 "io_req=0x%x is already a cleanup command cmd_type=%d.\n",
2213 io_req->xid, io_req->cmd_type);
2214 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2215 return SUCCESS;
2216 }
2217
2218 refcount = kref_read(&io_req->refcount);
2219
2220 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
2221 "Entered xid=0x%x sc_cmd=%p cmd_type=%d flags=0x%lx refcount=%d fcport=%p port_id=0x%06x\n",
2222 io_req->xid, io_req->sc_cmd, io_req->cmd_type, io_req->flags,
2223 refcount, fcport, fcport->rdata->ids.port_id);
2224
2225 /* Cleanup cmds re-use the same TID as the original I/O */
2226 spin_lock_irqsave(&fcport->rport_lock, flags);
2227 io_req->cmd_type = QEDF_CLEANUP;
2228 spin_unlock_irqrestore(&fcport->rport_lock, flags);
2229 io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
2230
2231 init_completion(&io_req->cleanup_done);
2232
2233 spin_lock_irqsave(&fcport->rport_lock, flags);
2234
2235 sqe_idx = qedf_get_sqe_idx(fcport);
2236 sqe = &fcport->sq[sqe_idx];
2237 memset(sqe, 0, sizeof(struct fcoe_wqe));
2238 io_req->task_params->sqe = sqe;
2239
2240 init_initiator_cleanup_fcoe_task(io_req->task_params);
2241 qedf_ring_doorbell(fcport);
2242
2243 spin_unlock_irqrestore(&fcport->rport_lock, flags);
2244
2245 tmo = wait_for_completion_timeout(&io_req->cleanup_done,
2246 QEDF_CLEANUP_TIMEOUT * HZ);
2247
2248 if (!tmo) {
2249 rc = FAILED;
2250 /* Timeout case */
2251 QEDF_ERR(&(qedf->dbg_ctx), "Cleanup command timeout, "
2252 "xid=%x.\n", io_req->xid);
2253 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2254 /* Issue a drain request if cleanup task times out */
2255 QEDF_ERR(&(qedf->dbg_ctx), "Issuing MCP drain request.\n");
2256 qedf_drain_request(qedf);
2257 }
2258
2259 /* If it TASK MGMT handle it, reference will be decreased
2260 * in qedf_execute_tmf
2261 */
2262 if (io_req->tm_flags == FCP_TMF_LUN_RESET ||
2263 io_req->tm_flags == FCP_TMF_TGT_RESET) {
2264 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2265 io_req->sc_cmd = NULL;
2266 kref_put(&io_req->refcount, qedf_release_cmd);
2267 complete(&io_req->tm_done);
2268 }
2269
2270 if (io_req->sc_cmd) {
2271 if (!io_req->return_scsi_cmd_on_abts)
2272 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2273 "Not call scsi_done for xid=0x%x.\n",
2274 io_req->xid);
2275 if (io_req->return_scsi_cmd_on_abts)
2276 qedf_scsi_done(qedf, io_req, DID_ERROR);
2277 }
2278
2279 if (rc == SUCCESS)
2280 io_req->event = QEDF_IOREQ_EV_CLEANUP_SUCCESS;
2281 else
2282 io_req->event = QEDF_IOREQ_EV_CLEANUP_FAILED;
2283
2284 return rc;
2285 }
2286
qedf_process_cleanup_compl(struct qedf_ctx * qedf,struct fcoe_cqe * cqe,struct qedf_ioreq * io_req)2287 void qedf_process_cleanup_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
2288 struct qedf_ioreq *io_req)
2289 {
2290 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Entered xid = 0x%x\n",
2291 io_req->xid);
2292
2293 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2294
2295 /* Complete so we can finish cleaning up the I/O */
2296 complete(&io_req->cleanup_done);
2297 }
2298
qedf_execute_tmf(struct qedf_rport * fcport,struct scsi_cmnd * sc_cmd,uint8_t tm_flags)2299 static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
2300 uint8_t tm_flags)
2301 {
2302 struct qedf_ioreq *io_req;
2303 struct e4_fcoe_task_context *task;
2304 struct qedf_ctx *qedf = fcport->qedf;
2305 struct fc_lport *lport = qedf->lport;
2306 int rc = 0;
2307 uint16_t xid;
2308 int tmo = 0;
2309 int lun = 0;
2310 unsigned long flags;
2311 struct fcoe_wqe *sqe;
2312 u16 sqe_idx;
2313
2314 if (!sc_cmd) {
2315 QEDF_ERR(&qedf->dbg_ctx, "sc_cmd is NULL\n");
2316 return FAILED;
2317 }
2318
2319 lun = (int)sc_cmd->device->lun;
2320 if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
2321 QEDF_ERR(&(qedf->dbg_ctx), "fcport not offloaded\n");
2322 rc = FAILED;
2323 goto no_flush;
2324 }
2325
2326 io_req = qedf_alloc_cmd(fcport, QEDF_TASK_MGMT_CMD);
2327 if (!io_req) {
2328 QEDF_ERR(&(qedf->dbg_ctx), "Failed TMF");
2329 rc = -EAGAIN;
2330 goto no_flush;
2331 }
2332
2333 if (tm_flags == FCP_TMF_LUN_RESET)
2334 qedf->lun_resets++;
2335 else if (tm_flags == FCP_TMF_TGT_RESET)
2336 qedf->target_resets++;
2337
2338 /* Initialize rest of io_req fields */
2339 io_req->sc_cmd = sc_cmd;
2340 io_req->fcport = fcport;
2341 io_req->cmd_type = QEDF_TASK_MGMT_CMD;
2342
2343 /* Record which cpu this request is associated with */
2344 io_req->cpu = smp_processor_id();
2345
2346 /* Set TM flags */
2347 io_req->io_req_flags = QEDF_READ;
2348 io_req->data_xfer_len = 0;
2349 io_req->tm_flags = tm_flags;
2350
2351 /* Default is to return a SCSI command when an error occurs */
2352 io_req->return_scsi_cmd_on_abts = false;
2353
2354 /* Obtain exchange id */
2355 xid = io_req->xid;
2356
2357 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "TMF io_req xid = "
2358 "0x%x\n", xid);
2359
2360 /* Initialize task context for this IO request */
2361 task = qedf_get_task_mem(&qedf->tasks, xid);
2362
2363 init_completion(&io_req->tm_done);
2364
2365 spin_lock_irqsave(&fcport->rport_lock, flags);
2366
2367 sqe_idx = qedf_get_sqe_idx(fcport);
2368 sqe = &fcport->sq[sqe_idx];
2369 memset(sqe, 0, sizeof(struct fcoe_wqe));
2370
2371 qedf_init_task(fcport, lport, io_req, task, sqe);
2372 qedf_ring_doorbell(fcport);
2373
2374 spin_unlock_irqrestore(&fcport->rport_lock, flags);
2375
2376 set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2377 tmo = wait_for_completion_timeout(&io_req->tm_done,
2378 QEDF_TM_TIMEOUT * HZ);
2379
2380 if (!tmo) {
2381 rc = FAILED;
2382 QEDF_ERR(&(qedf->dbg_ctx), "wait for tm_cmpl timeout!\n");
2383 /* Clear outstanding bit since command timed out */
2384 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2385 io_req->sc_cmd = NULL;
2386 } else {
2387 /* Check TMF response code */
2388 if (io_req->fcp_rsp_code == 0)
2389 rc = SUCCESS;
2390 else
2391 rc = FAILED;
2392 }
2393 /*
2394 * Double check that fcport has not gone into an uploading state before
2395 * executing the command flush for the LUN/target.
2396 */
2397 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2398 QEDF_ERR(&qedf->dbg_ctx,
2399 "fcport is uploading, not executing flush.\n");
2400 goto no_flush;
2401 }
2402 /* We do not need this io_req any more */
2403 kref_put(&io_req->refcount, qedf_release_cmd);
2404
2405
2406 if (tm_flags == FCP_TMF_LUN_RESET)
2407 qedf_flush_active_ios(fcport, lun);
2408 else
2409 qedf_flush_active_ios(fcport, -1);
2410
2411 no_flush:
2412 if (rc != SUCCESS) {
2413 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command failed...\n");
2414 rc = FAILED;
2415 } else {
2416 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command success...\n");
2417 rc = SUCCESS;
2418 }
2419 return rc;
2420 }
2421
qedf_initiate_tmf(struct scsi_cmnd * sc_cmd,u8 tm_flags)2422 int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
2423 {
2424 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2425 struct fc_rport_libfc_priv *rp = rport->dd_data;
2426 struct qedf_rport *fcport = (struct qedf_rport *)&rp[1];
2427 struct qedf_ctx *qedf;
2428 struct fc_lport *lport = shost_priv(sc_cmd->device->host);
2429 int rc = SUCCESS;
2430 int rval;
2431 struct qedf_ioreq *io_req = NULL;
2432 int ref_cnt = 0;
2433 struct fc_rport_priv *rdata = fcport->rdata;
2434
2435 QEDF_ERR(NULL,
2436 "tm_flags 0x%x sc_cmd %p op = 0x%02x target_id = 0x%x lun=%d\n",
2437 tm_flags, sc_cmd, sc_cmd->cmd_len ? sc_cmd->cmnd[0] : 0xff,
2438 rport->scsi_target_id, (int)sc_cmd->device->lun);
2439
2440 if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
2441 QEDF_ERR(NULL, "stale rport\n");
2442 return FAILED;
2443 }
2444
2445 QEDF_ERR(NULL, "portid=%06x tm_flags =%s\n", rdata->ids.port_id,
2446 (tm_flags == FCP_TMF_TGT_RESET) ? "TARGET RESET" :
2447 "LUN RESET");
2448
2449 if (sc_cmd->SCp.ptr) {
2450 io_req = (struct qedf_ioreq *)sc_cmd->SCp.ptr;
2451 ref_cnt = kref_read(&io_req->refcount);
2452 QEDF_ERR(NULL,
2453 "orig io_req = %p xid = 0x%x ref_cnt = %d.\n",
2454 io_req, io_req->xid, ref_cnt);
2455 }
2456
2457 rval = fc_remote_port_chkready(rport);
2458 if (rval) {
2459 QEDF_ERR(NULL, "device_reset rport not ready\n");
2460 rc = FAILED;
2461 goto tmf_err;
2462 }
2463
2464 rc = fc_block_scsi_eh(sc_cmd);
2465 if (rc)
2466 goto tmf_err;
2467
2468 if (!fcport) {
2469 QEDF_ERR(NULL, "device_reset: rport is NULL\n");
2470 rc = FAILED;
2471 goto tmf_err;
2472 }
2473
2474 qedf = fcport->qedf;
2475
2476 if (!qedf) {
2477 QEDF_ERR(NULL, "qedf is NULL.\n");
2478 rc = FAILED;
2479 goto tmf_err;
2480 }
2481
2482 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2483 QEDF_ERR(&qedf->dbg_ctx, "Connection is getting uploaded.\n");
2484 rc = SUCCESS;
2485 goto tmf_err;
2486 }
2487
2488 if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
2489 test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
2490 rc = SUCCESS;
2491 goto tmf_err;
2492 }
2493
2494 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
2495 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
2496 rc = FAILED;
2497 goto tmf_err;
2498 }
2499
2500 if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2501 if (!fcport->rdata)
2502 QEDF_ERR(&qedf->dbg_ctx, "fcport %p is uploading.\n",
2503 fcport);
2504 else
2505 QEDF_ERR(&qedf->dbg_ctx,
2506 "fcport %p port_id=%06x is uploading.\n",
2507 fcport, fcport->rdata->ids.port_id);
2508 rc = FAILED;
2509 goto tmf_err;
2510 }
2511
2512 rc = qedf_execute_tmf(fcport, sc_cmd, tm_flags);
2513
2514 tmf_err:
2515 kref_put(&rdata->kref, fc_rport_destroy);
2516 return rc;
2517 }
2518
qedf_process_tmf_compl(struct qedf_ctx * qedf,struct fcoe_cqe * cqe,struct qedf_ioreq * io_req)2519 void qedf_process_tmf_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
2520 struct qedf_ioreq *io_req)
2521 {
2522 struct fcoe_cqe_rsp_info *fcp_rsp;
2523
2524 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2525
2526 fcp_rsp = &cqe->cqe_info.rsp_info;
2527 qedf_parse_fcp_rsp(io_req, fcp_rsp);
2528
2529 io_req->sc_cmd = NULL;
2530 complete(&io_req->tm_done);
2531 }
2532
qedf_process_unsol_compl(struct qedf_ctx * qedf,uint16_t que_idx,struct fcoe_cqe * cqe)2533 void qedf_process_unsol_compl(struct qedf_ctx *qedf, uint16_t que_idx,
2534 struct fcoe_cqe *cqe)
2535 {
2536 unsigned long flags;
2537 uint16_t pktlen = cqe->cqe_info.unsolic_info.pkt_len;
2538 u32 payload_len, crc;
2539 struct fc_frame_header *fh;
2540 struct fc_frame *fp;
2541 struct qedf_io_work *io_work;
2542 u32 bdq_idx;
2543 void *bdq_addr;
2544 struct scsi_bd *p_bd_info;
2545
2546 p_bd_info = &cqe->cqe_info.unsolic_info.bd_info;
2547 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2548 "address.hi=%x, address.lo=%x, opaque_data.hi=%x, opaque_data.lo=%x, bdq_prod_idx=%u, len=%u\n",
2549 le32_to_cpu(p_bd_info->address.hi),
2550 le32_to_cpu(p_bd_info->address.lo),
2551 le32_to_cpu(p_bd_info->opaque.fcoe_opaque.hi),
2552 le32_to_cpu(p_bd_info->opaque.fcoe_opaque.lo),
2553 qedf->bdq_prod_idx, pktlen);
2554
2555 bdq_idx = le32_to_cpu(p_bd_info->opaque.fcoe_opaque.lo);
2556 if (bdq_idx >= QEDF_BDQ_SIZE) {
2557 QEDF_ERR(&(qedf->dbg_ctx), "bdq_idx is out of range %d.\n",
2558 bdq_idx);
2559 goto increment_prod;
2560 }
2561
2562 bdq_addr = qedf->bdq[bdq_idx].buf_addr;
2563 if (!bdq_addr) {
2564 QEDF_ERR(&(qedf->dbg_ctx), "bdq_addr is NULL, dropping "
2565 "unsolicited packet.\n");
2566 goto increment_prod;
2567 }
2568
2569 if (qedf_dump_frames) {
2570 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2571 "BDQ frame is at addr=%p.\n", bdq_addr);
2572 print_hex_dump(KERN_WARNING, "bdq ", DUMP_PREFIX_OFFSET, 16, 1,
2573 (void *)bdq_addr, pktlen, false);
2574 }
2575
2576 /* Allocate frame */
2577 payload_len = pktlen - sizeof(struct fc_frame_header);
2578 fp = fc_frame_alloc(qedf->lport, payload_len);
2579 if (!fp) {
2580 QEDF_ERR(&(qedf->dbg_ctx), "Could not allocate fp.\n");
2581 goto increment_prod;
2582 }
2583
2584 /* Copy data from BDQ buffer into fc_frame struct */
2585 fh = (struct fc_frame_header *)fc_frame_header_get(fp);
2586 memcpy(fh, (void *)bdq_addr, pktlen);
2587
2588 QEDF_WARN(&qedf->dbg_ctx,
2589 "Processing Unsolicated frame, src=%06x dest=%06x r_ctl=0x%x type=0x%x cmd=%02x\n",
2590 ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id), fh->fh_r_ctl,
2591 fh->fh_type, fc_frame_payload_op(fp));
2592
2593 /* Initialize the frame so libfc sees it as a valid frame */
2594 crc = fcoe_fc_crc(fp);
2595 fc_frame_init(fp);
2596 fr_dev(fp) = qedf->lport;
2597 fr_sof(fp) = FC_SOF_I3;
2598 fr_eof(fp) = FC_EOF_T;
2599 fr_crc(fp) = cpu_to_le32(~crc);
2600
2601 /*
2602 * We need to return the frame back up to libfc in a non-atomic
2603 * context
2604 */
2605 io_work = mempool_alloc(qedf->io_mempool, GFP_ATOMIC);
2606 if (!io_work) {
2607 QEDF_WARN(&(qedf->dbg_ctx), "Could not allocate "
2608 "work for I/O completion.\n");
2609 fc_frame_free(fp);
2610 goto increment_prod;
2611 }
2612 memset(io_work, 0, sizeof(struct qedf_io_work));
2613
2614 INIT_WORK(&io_work->work, qedf_fp_io_handler);
2615
2616 /* Copy contents of CQE for deferred processing */
2617 memcpy(&io_work->cqe, cqe, sizeof(struct fcoe_cqe));
2618
2619 io_work->qedf = qedf;
2620 io_work->fp = fp;
2621
2622 queue_work_on(smp_processor_id(), qedf_io_wq, &io_work->work);
2623 increment_prod:
2624 spin_lock_irqsave(&qedf->hba_lock, flags);
2625
2626 /* Increment producer to let f/w know we've handled the frame */
2627 qedf->bdq_prod_idx++;
2628
2629 /* Producer index wraps at uint16_t boundary */
2630 if (qedf->bdq_prod_idx == 0xffff)
2631 qedf->bdq_prod_idx = 0;
2632
2633 writew(qedf->bdq_prod_idx, qedf->bdq_primary_prod);
2634 readw(qedf->bdq_primary_prod);
2635 writew(qedf->bdq_prod_idx, qedf->bdq_secondary_prod);
2636 readw(qedf->bdq_secondary_prod);
2637
2638 spin_unlock_irqrestore(&qedf->hba_lock, flags);
2639 }
2640