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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / nvme / target / fcloop.c
blob1c50af6219f321360b05b729a9f382842b6fb46b
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2016 Avago Technologies. All rights reserved.
4 */
5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6 #include <linux/module.h>
7 #include <linux/parser.h>
8 #include <uapi/scsi/fc/fc_fs.h>
9
10 #include "../host/nvme.h"
11 #include "../target/nvmet.h"
12 #include <linux/nvme-fc-driver.h>
13 #include <linux/nvme-fc.h>
14
15
16 enum {
17 NVMF_OPT_ERR = 0,
18 NVMF_OPT_WWNN = 1 << 0,
19 NVMF_OPT_WWPN = 1 << 1,
20 NVMF_OPT_ROLES = 1 << 2,
21 NVMF_OPT_FCADDR = 1 << 3,
22 NVMF_OPT_LPWWNN = 1 << 4,
23 NVMF_OPT_LPWWPN = 1 << 5,
24 };
25
26 struct fcloop_ctrl_options {
27 int mask;
28 u64 wwnn;
29 u64 wwpn;
30 u32 roles;
31 u32 fcaddr;
32 u64 lpwwnn;
33 u64 lpwwpn;
34 };
35
36 static const match_table_t opt_tokens = {
37 { NVMF_OPT_WWNN, "wwnn=%s" },
38 { NVMF_OPT_WWPN, "wwpn=%s" },
39 { NVMF_OPT_ROLES, "roles=%d" },
40 { NVMF_OPT_FCADDR, "fcaddr=%x" },
41 { NVMF_OPT_LPWWNN, "lpwwnn=%s" },
42 { NVMF_OPT_LPWWPN, "lpwwpn=%s" },
43 { NVMF_OPT_ERR, NULL }
44 };
45
46 static int
47 fcloop_parse_options(struct fcloop_ctrl_options *opts,
48 const char *buf)
49 {
50 substring_t args[MAX_OPT_ARGS];
51 char *options, *o, *p;
52 int token, ret = 0;
53 u64 token64;
54
55 options = o = kstrdup(buf, GFP_KERNEL);
56 if (!options)
57 return -ENOMEM;
58
59 while ((p = strsep(&o, ",\n")) != NULL) {
60 if (!*p)
61 continue;
62
63 token = match_token(p, opt_tokens, args);
64 opts->mask |= token;
65 switch (token) {
66 case NVMF_OPT_WWNN:
67 if (match_u64(args, &token64)) {
68 ret = -EINVAL;
69 goto out_free_options;
70 }
71 opts->wwnn = token64;
72 break;
73 case NVMF_OPT_WWPN:
74 if (match_u64(args, &token64)) {
75 ret = -EINVAL;
76 goto out_free_options;
77 }
78 opts->wwpn = token64;
79 break;
80 case NVMF_OPT_ROLES:
81 if (match_int(args, &token)) {
82 ret = -EINVAL;
83 goto out_free_options;
84 }
85 opts->roles = token;
86 break;
87 case NVMF_OPT_FCADDR:
88 if (match_hex(args, &token)) {
89 ret = -EINVAL;
90 goto out_free_options;
91 }
92 opts->fcaddr = token;
93 break;
94 case NVMF_OPT_LPWWNN:
95 if (match_u64(args, &token64)) {
96 ret = -EINVAL;
97 goto out_free_options;
98 }
99 opts->lpwwnn = token64;
100 break;
101 case NVMF_OPT_LPWWPN:
102 if (match_u64(args, &token64)) {
103 ret = -EINVAL;
104 goto out_free_options;
105 }
106 opts->lpwwpn = token64;
107 break;
108 default:
109 pr_warn("unknown parameter or missing value '%s'\n", p);
110 ret = -EINVAL;
111 goto out_free_options;
112 }
113 }
114
115 out_free_options:
116 kfree(options);
117 return ret;
118 }
119
120
121 static int
122 fcloop_parse_nm_options(struct device *dev, u64 *nname, u64 *pname,
123 const char *buf)
124 {
125 substring_t args[MAX_OPT_ARGS];
126 char *options, *o, *p;
127 int token, ret = 0;
128 u64 token64;
129
130 *nname = -1;
131 *pname = -1;
132
133 options = o = kstrdup(buf, GFP_KERNEL);
134 if (!options)
135 return -ENOMEM;
136
137 while ((p = strsep(&o, ",\n")) != NULL) {
138 if (!*p)
139 continue;
140
141 token = match_token(p, opt_tokens, args);
142 switch (token) {
143 case NVMF_OPT_WWNN:
144 if (match_u64(args, &token64)) {
145 ret = -EINVAL;
146 goto out_free_options;
147 }
148 *nname = token64;
149 break;
150 case NVMF_OPT_WWPN:
151 if (match_u64(args, &token64)) {
152 ret = -EINVAL;
153 goto out_free_options;
154 }
155 *pname = token64;
156 break;
157 default:
158 pr_warn("unknown parameter or missing value '%s'\n", p);
159 ret = -EINVAL;
160 goto out_free_options;
161 }
162 }
163
164 out_free_options:
165 kfree(options);
166
167 if (!ret) {
168 if (*nname == -1)
169 return -EINVAL;
170 if (*pname == -1)
171 return -EINVAL;
172 }
173
174 return ret;
175 }
176
177
178 #define LPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN)
179
180 #define RPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN | \
181 NVMF_OPT_LPWWNN | NVMF_OPT_LPWWPN)
182
183 #define TGTPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN)
184
185
186 static DEFINE_SPINLOCK(fcloop_lock);
187 static LIST_HEAD(fcloop_lports);
188 static LIST_HEAD(fcloop_nports);
189
190 struct fcloop_lport {
191 struct nvme_fc_local_port *localport;
192 struct list_head lport_list;
193 struct completion unreg_done;
194 };
195
196 struct fcloop_lport_priv {
197 struct fcloop_lport *lport;
198 };
199
200 struct fcloop_rport {
201 struct nvme_fc_remote_port *remoteport;
202 struct nvmet_fc_target_port *targetport;
203 struct fcloop_nport *nport;
204 struct fcloop_lport *lport;
205 };
206
207 struct fcloop_tport {
208 struct nvmet_fc_target_port *targetport;
209 struct nvme_fc_remote_port *remoteport;
210 struct fcloop_nport *nport;
211 struct fcloop_lport *lport;
212 };
213
214 struct fcloop_nport {
215 struct fcloop_rport *rport;
216 struct fcloop_tport *tport;
217 struct fcloop_lport *lport;
218 struct list_head nport_list;
219 struct kref ref;
220 u64 node_name;
221 u64 port_name;
222 u32 port_role;
223 u32 port_id;
224 };
225
226 struct fcloop_lsreq {
227 struct fcloop_tport *tport;
228 struct nvmefc_ls_req *lsreq;
229 struct work_struct work;
230 struct nvmefc_tgt_ls_req tgt_ls_req;
231 int status;
232 };
233
234 struct fcloop_rscn {
235 struct fcloop_tport *tport;
236 struct work_struct work;
237 };
238
239 enum {
240 INI_IO_START = 0,
241 INI_IO_ACTIVE = 1,
242 INI_IO_ABORTED = 2,
243 INI_IO_COMPLETED = 3,
244 };
245
246 struct fcloop_fcpreq {
247 struct fcloop_tport *tport;
248 struct nvmefc_fcp_req *fcpreq;
249 spinlock_t reqlock;
250 u16 status;
251 u32 inistate;
252 bool active;
253 bool aborted;
254 struct kref ref;
255 struct work_struct fcp_rcv_work;
256 struct work_struct abort_rcv_work;
257 struct work_struct tio_done_work;
258 struct nvmefc_tgt_fcp_req tgt_fcp_req;
259 };
260
261 struct fcloop_ini_fcpreq {
262 struct nvmefc_fcp_req *fcpreq;
263 struct fcloop_fcpreq *tfcp_req;
264 spinlock_t inilock;
265 };
266
267 static inline struct fcloop_lsreq *
268 tgt_ls_req_to_lsreq(struct nvmefc_tgt_ls_req *tgt_lsreq)
269 {
270 return container_of(tgt_lsreq, struct fcloop_lsreq, tgt_ls_req);
271 }
272
273 static inline struct fcloop_fcpreq *
274 tgt_fcp_req_to_fcpreq(struct nvmefc_tgt_fcp_req *tgt_fcpreq)
275 {
276 return container_of(tgt_fcpreq, struct fcloop_fcpreq, tgt_fcp_req);
277 }
278
279
280 static int
281 fcloop_create_queue(struct nvme_fc_local_port *localport,
282 unsigned int qidx, u16 qsize,
283 void **handle)
284 {
285 *handle = localport;
286 return 0;
287 }
288
289 static void
290 fcloop_delete_queue(struct nvme_fc_local_port *localport,
291 unsigned int idx, void *handle)
292 {
293 }
294
295
296 /*
297 * Transmit of LS RSP done (e.g. buffers all set). call back up
298 * initiator "done" flows.
299 */
300 static void
301 fcloop_tgt_lsrqst_done_work(struct work_struct *work)
302 {
303 struct fcloop_lsreq *tls_req =
304 container_of(work, struct fcloop_lsreq, work);
305 struct fcloop_tport *tport = tls_req->tport;
306 struct nvmefc_ls_req *lsreq = tls_req->lsreq;
307
308 if (!tport || tport->remoteport)
309 lsreq->done(lsreq, tls_req->status);
310 }
311
312 static int
313 fcloop_ls_req(struct nvme_fc_local_port *localport,
314 struct nvme_fc_remote_port *remoteport,
315 struct nvmefc_ls_req *lsreq)
316 {
317 struct fcloop_lsreq *tls_req = lsreq->private;
318 struct fcloop_rport *rport = remoteport->private;
319 int ret = 0;
320
321 tls_req->lsreq = lsreq;
322 INIT_WORK(&tls_req->work, fcloop_tgt_lsrqst_done_work);
323
324 if (!rport->targetport) {
325 tls_req->status = -ECONNREFUSED;
326 tls_req->tport = NULL;
327 schedule_work(&tls_req->work);
328 return ret;
329 }
330
331 tls_req->status = 0;
332 tls_req->tport = rport->targetport->private;
333 ret = nvmet_fc_rcv_ls_req(rport->targetport, &tls_req->tgt_ls_req,
334 lsreq->rqstaddr, lsreq->rqstlen);
335
336 return ret;
337 }
338
339 static int
340 fcloop_xmt_ls_rsp(struct nvmet_fc_target_port *tport,
341 struct nvmefc_tgt_ls_req *tgt_lsreq)
342 {
343 struct fcloop_lsreq *tls_req = tgt_ls_req_to_lsreq(tgt_lsreq);
344 struct nvmefc_ls_req *lsreq = tls_req->lsreq;
345
346 memcpy(lsreq->rspaddr, tgt_lsreq->rspbuf,
347 ((lsreq->rsplen < tgt_lsreq->rsplen) ?
348 lsreq->rsplen : tgt_lsreq->rsplen));
349 tgt_lsreq->done(tgt_lsreq);
350
351 schedule_work(&tls_req->work);
352
353 return 0;
354 }
355
356 /*
357 * Simulate reception of RSCN and converting it to a initiator transport
358 * call to rescan a remote port.
359 */
360 static void
361 fcloop_tgt_rscn_work(struct work_struct *work)
362 {
363 struct fcloop_rscn *tgt_rscn =
364 container_of(work, struct fcloop_rscn, work);
365 struct fcloop_tport *tport = tgt_rscn->tport;
366
367 if (tport->remoteport)
368 nvme_fc_rescan_remoteport(tport->remoteport);
369 kfree(tgt_rscn);
370 }
371
372 static void
373 fcloop_tgt_discovery_evt(struct nvmet_fc_target_port *tgtport)
374 {
375 struct fcloop_rscn *tgt_rscn;
376
377 tgt_rscn = kzalloc(sizeof(*tgt_rscn), GFP_KERNEL);
378 if (!tgt_rscn)
379 return;
380
381 tgt_rscn->tport = tgtport->private;
382 INIT_WORK(&tgt_rscn->work, fcloop_tgt_rscn_work);
383
384 schedule_work(&tgt_rscn->work);
385 }
386
387 static void
388 fcloop_tfcp_req_free(struct kref *ref)
389 {
390 struct fcloop_fcpreq *tfcp_req =
391 container_of(ref, struct fcloop_fcpreq, ref);
392
393 kfree(tfcp_req);
394 }
395
396 static void
397 fcloop_tfcp_req_put(struct fcloop_fcpreq *tfcp_req)
398 {
399 kref_put(&tfcp_req->ref, fcloop_tfcp_req_free);
400 }
401
402 static int
403 fcloop_tfcp_req_get(struct fcloop_fcpreq *tfcp_req)
404 {
405 return kref_get_unless_zero(&tfcp_req->ref);
406 }
407
408 static void
409 fcloop_call_host_done(struct nvmefc_fcp_req *fcpreq,
410 struct fcloop_fcpreq *tfcp_req, int status)
411 {
412 struct fcloop_ini_fcpreq *inireq = NULL;
413
414 if (fcpreq) {
415 inireq = fcpreq->private;
416 spin_lock(&inireq->inilock);
417 inireq->tfcp_req = NULL;
418 spin_unlock(&inireq->inilock);
419
420 fcpreq->status = status;
421 fcpreq->done(fcpreq);
422 }
423
424 /* release original io reference on tgt struct */
425 fcloop_tfcp_req_put(tfcp_req);
426 }
427
428 static void
429 fcloop_fcp_recv_work(struct work_struct *work)
430 {
431 struct fcloop_fcpreq *tfcp_req =
432 container_of(work, struct fcloop_fcpreq, fcp_rcv_work);
433 struct nvmefc_fcp_req *fcpreq = tfcp_req->fcpreq;
434 int ret = 0;
435 bool aborted = false;
436
437 spin_lock_irq(&tfcp_req->reqlock);
438 switch (tfcp_req->inistate) {
439 case INI_IO_START:
440 tfcp_req->inistate = INI_IO_ACTIVE;
441 break;
442 case INI_IO_ABORTED:
443 aborted = true;
444 break;
445 default:
446 spin_unlock_irq(&tfcp_req->reqlock);
447 WARN_ON(1);
448 return;
449 }
450 spin_unlock_irq(&tfcp_req->reqlock);
451
452 if (unlikely(aborted))
453 ret = -ECANCELED;
454 else
455 ret = nvmet_fc_rcv_fcp_req(tfcp_req->tport->targetport,
456 &tfcp_req->tgt_fcp_req,
457 fcpreq->cmdaddr, fcpreq->cmdlen);
458 if (ret)
459 fcloop_call_host_done(fcpreq, tfcp_req, ret);
460
461 return;
462 }
463
464 static void
465 fcloop_fcp_abort_recv_work(struct work_struct *work)
466 {
467 struct fcloop_fcpreq *tfcp_req =
468 container_of(work, struct fcloop_fcpreq, abort_rcv_work);
469 struct nvmefc_fcp_req *fcpreq;
470 bool completed = false;
471
472 spin_lock_irq(&tfcp_req->reqlock);
473 fcpreq = tfcp_req->fcpreq;
474 switch (tfcp_req->inistate) {
475 case INI_IO_ABORTED:
476 break;
477 case INI_IO_COMPLETED:
478 completed = true;
479 break;
480 default:
481 spin_unlock_irq(&tfcp_req->reqlock);
482 WARN_ON(1);
483 return;
484 }
485 spin_unlock_irq(&tfcp_req->reqlock);
486
487 if (unlikely(completed)) {
488 /* remove reference taken in original abort downcall */
489 fcloop_tfcp_req_put(tfcp_req);
490 return;
491 }
492
493 if (tfcp_req->tport->targetport)
494 nvmet_fc_rcv_fcp_abort(tfcp_req->tport->targetport,
495 &tfcp_req->tgt_fcp_req);
496
497 spin_lock_irq(&tfcp_req->reqlock);
498 tfcp_req->fcpreq = NULL;
499 spin_unlock_irq(&tfcp_req->reqlock);
500
501 fcloop_call_host_done(fcpreq, tfcp_req, -ECANCELED);
502 /* call_host_done releases reference for abort downcall */
503 }
504
505 /*
506 * FCP IO operation done by target completion.
507 * call back up initiator "done" flows.
508 */
509 static void
510 fcloop_tgt_fcprqst_done_work(struct work_struct *work)
511 {
512 struct fcloop_fcpreq *tfcp_req =
513 container_of(work, struct fcloop_fcpreq, tio_done_work);
514 struct nvmefc_fcp_req *fcpreq;
515
516 spin_lock_irq(&tfcp_req->reqlock);
517 fcpreq = tfcp_req->fcpreq;
518 tfcp_req->inistate = INI_IO_COMPLETED;
519 spin_unlock_irq(&tfcp_req->reqlock);
520
521 fcloop_call_host_done(fcpreq, tfcp_req, tfcp_req->status);
522 }
523
524
525 static int
526 fcloop_fcp_req(struct nvme_fc_local_port *localport,
527 struct nvme_fc_remote_port *remoteport,
528 void *hw_queue_handle,
529 struct nvmefc_fcp_req *fcpreq)
530 {
531 struct fcloop_rport *rport = remoteport->private;
532 struct fcloop_ini_fcpreq *inireq = fcpreq->private;
533 struct fcloop_fcpreq *tfcp_req;
534
535 if (!rport->targetport)
536 return -ECONNREFUSED;
537
538 tfcp_req = kzalloc(sizeof(*tfcp_req), GFP_ATOMIC);
539 if (!tfcp_req)
540 return -ENOMEM;
541
542 inireq->fcpreq = fcpreq;
543 inireq->tfcp_req = tfcp_req;
544 spin_lock_init(&inireq->inilock);
545
546 tfcp_req->fcpreq = fcpreq;
547 tfcp_req->tport = rport->targetport->private;
548 tfcp_req->inistate = INI_IO_START;
549 spin_lock_init(&tfcp_req->reqlock);
550 INIT_WORK(&tfcp_req->fcp_rcv_work, fcloop_fcp_recv_work);
551 INIT_WORK(&tfcp_req->abort_rcv_work, fcloop_fcp_abort_recv_work);
552 INIT_WORK(&tfcp_req->tio_done_work, fcloop_tgt_fcprqst_done_work);
553 kref_init(&tfcp_req->ref);
554
555 schedule_work(&tfcp_req->fcp_rcv_work);
556
557 return 0;
558 }
559
560 static void
561 fcloop_fcp_copy_data(u8 op, struct scatterlist *data_sg,
562 struct scatterlist *io_sg, u32 offset, u32 length)
563 {
564 void *data_p, *io_p;
565 u32 data_len, io_len, tlen;
566
567 io_p = sg_virt(io_sg);
568 io_len = io_sg->length;
569
570 for ( ; offset; ) {
571 tlen = min_t(u32, offset, io_len);
572 offset -= tlen;
573 io_len -= tlen;
574 if (!io_len) {
575 io_sg = sg_next(io_sg);
576 io_p = sg_virt(io_sg);
577 io_len = io_sg->length;
578 } else
579 io_p += tlen;
580 }
581
582 data_p = sg_virt(data_sg);
583 data_len = data_sg->length;
584
585 for ( ; length; ) {
586 tlen = min_t(u32, io_len, data_len);
587 tlen = min_t(u32, tlen, length);
588
589 if (op == NVMET_FCOP_WRITEDATA)
590 memcpy(data_p, io_p, tlen);
591 else
592 memcpy(io_p, data_p, tlen);
593
594 length -= tlen;
595
596 io_len -= tlen;
597 if ((!io_len) && (length)) {
598 io_sg = sg_next(io_sg);
599 io_p = sg_virt(io_sg);
600 io_len = io_sg->length;
601 } else
602 io_p += tlen;
603
604 data_len -= tlen;
605 if ((!data_len) && (length)) {
606 data_sg = sg_next(data_sg);
607 data_p = sg_virt(data_sg);
608 data_len = data_sg->length;
609 } else
610 data_p += tlen;
611 }
612 }
613
614 static int
615 fcloop_fcp_op(struct nvmet_fc_target_port *tgtport,
616 struct nvmefc_tgt_fcp_req *tgt_fcpreq)
617 {
618 struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
619 struct nvmefc_fcp_req *fcpreq;
620 u32 rsplen = 0, xfrlen = 0;
621 int fcp_err = 0, active, aborted;
622 u8 op = tgt_fcpreq->op;
623
624 spin_lock_irq(&tfcp_req->reqlock);
625 fcpreq = tfcp_req->fcpreq;
626 active = tfcp_req->active;
627 aborted = tfcp_req->aborted;
628 tfcp_req->active = true;
629 spin_unlock_irq(&tfcp_req->reqlock);
630
631 if (unlikely(active))
632 /* illegal - call while i/o active */
633 return -EALREADY;
634
635 if (unlikely(aborted)) {
636 /* target transport has aborted i/o prior */
637 spin_lock_irq(&tfcp_req->reqlock);
638 tfcp_req->active = false;
639 spin_unlock_irq(&tfcp_req->reqlock);
640 tgt_fcpreq->transferred_length = 0;
641 tgt_fcpreq->fcp_error = -ECANCELED;
642 tgt_fcpreq->done(tgt_fcpreq);
643 return 0;
644 }
645
646 /*
647 * if fcpreq is NULL, the I/O has been aborted (from
648 * initiator side). For the target side, act as if all is well
649 * but don't actually move data.
650 */
651
652 switch (op) {
653 case NVMET_FCOP_WRITEDATA:
654 xfrlen = tgt_fcpreq->transfer_length;
655 if (fcpreq) {
656 fcloop_fcp_copy_data(op, tgt_fcpreq->sg,
657 fcpreq->first_sgl, tgt_fcpreq->offset,
658 xfrlen);
659 fcpreq->transferred_length += xfrlen;
660 }
661 break;
662
663 case NVMET_FCOP_READDATA:
664 case NVMET_FCOP_READDATA_RSP:
665 xfrlen = tgt_fcpreq->transfer_length;
666 if (fcpreq) {
667 fcloop_fcp_copy_data(op, tgt_fcpreq->sg,
668 fcpreq->first_sgl, tgt_fcpreq->offset,
669 xfrlen);
670 fcpreq->transferred_length += xfrlen;
671 }
672 if (op == NVMET_FCOP_READDATA)
673 break;
674
675 /* Fall-Thru to RSP handling */
676 /* FALLTHRU */
677
678 case NVMET_FCOP_RSP:
679 if (fcpreq) {
680 rsplen = ((fcpreq->rsplen < tgt_fcpreq->rsplen) ?
681 fcpreq->rsplen : tgt_fcpreq->rsplen);
682 memcpy(fcpreq->rspaddr, tgt_fcpreq->rspaddr, rsplen);
683 if (rsplen < tgt_fcpreq->rsplen)
684 fcp_err = -E2BIG;
685 fcpreq->rcv_rsplen = rsplen;
686 fcpreq->status = 0;
687 }
688 tfcp_req->status = 0;
689 break;
690
691 default:
692 fcp_err = -EINVAL;
693 break;
694 }
695
696 spin_lock_irq(&tfcp_req->reqlock);
697 tfcp_req->active = false;
698 spin_unlock_irq(&tfcp_req->reqlock);
699
700 tgt_fcpreq->transferred_length = xfrlen;
701 tgt_fcpreq->fcp_error = fcp_err;
702 tgt_fcpreq->done(tgt_fcpreq);
703
704 return 0;
705 }
706
707 static void
708 fcloop_tgt_fcp_abort(struct nvmet_fc_target_port *tgtport,
709 struct nvmefc_tgt_fcp_req *tgt_fcpreq)
710 {
711 struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
712
713 /*
714 * mark aborted only in case there were 2 threads in transport
715 * (one doing io, other doing abort) and only kills ops posted
716 * after the abort request
717 */
718 spin_lock_irq(&tfcp_req->reqlock);
719 tfcp_req->aborted = true;
720 spin_unlock_irq(&tfcp_req->reqlock);
721
722 tfcp_req->status = NVME_SC_INTERNAL;
723
724 /*
725 * nothing more to do. If io wasn't active, the transport should
726 * immediately call the req_release. If it was active, the op
727 * will complete, and the lldd should call req_release.
728 */
729 }
730
731 static void
732 fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport,
733 struct nvmefc_tgt_fcp_req *tgt_fcpreq)
734 {
735 struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
736
737 schedule_work(&tfcp_req->tio_done_work);
738 }
739
740 static void
741 fcloop_ls_abort(struct nvme_fc_local_port *localport,
742 struct nvme_fc_remote_port *remoteport,
743 struct nvmefc_ls_req *lsreq)
744 {
745 }
746
747 static void
748 fcloop_fcp_abort(struct nvme_fc_local_port *localport,
749 struct nvme_fc_remote_port *remoteport,
750 void *hw_queue_handle,
751 struct nvmefc_fcp_req *fcpreq)
752 {
753 struct fcloop_ini_fcpreq *inireq = fcpreq->private;
754 struct fcloop_fcpreq *tfcp_req;
755 bool abortio = true;
756
757 spin_lock(&inireq->inilock);
758 tfcp_req = inireq->tfcp_req;
759 if (tfcp_req)
760 fcloop_tfcp_req_get(tfcp_req);
761 spin_unlock(&inireq->inilock);
762
763 if (!tfcp_req)
764 /* abort has already been called */
765 return;
766
767 /* break initiator/target relationship for io */
768 spin_lock_irq(&tfcp_req->reqlock);
769 switch (tfcp_req->inistate) {
770 case INI_IO_START:
771 case INI_IO_ACTIVE:
772 tfcp_req->inistate = INI_IO_ABORTED;
773 break;
774 case INI_IO_COMPLETED:
775 abortio = false;
776 break;
777 default:
778 spin_unlock_irq(&tfcp_req->reqlock);
779 WARN_ON(1);
780 return;
781 }
782 spin_unlock_irq(&tfcp_req->reqlock);
783
784 if (abortio)
785 /* leave the reference while the work item is scheduled */
786 WARN_ON(!schedule_work(&tfcp_req->abort_rcv_work));
787 else {
788 /*
789 * as the io has already had the done callback made,
790 * nothing more to do. So release the reference taken above
791 */
792 fcloop_tfcp_req_put(tfcp_req);
793 }
794 }
795
796 static void
797 fcloop_nport_free(struct kref *ref)
798 {
799 struct fcloop_nport *nport =
800 container_of(ref, struct fcloop_nport, ref);
801 unsigned long flags;
802
803 spin_lock_irqsave(&fcloop_lock, flags);
804 list_del(&nport->nport_list);
805 spin_unlock_irqrestore(&fcloop_lock, flags);
806
807 kfree(nport);
808 }
809
810 static void
811 fcloop_nport_put(struct fcloop_nport *nport)
812 {
813 kref_put(&nport->ref, fcloop_nport_free);
814 }
815
816 static int
817 fcloop_nport_get(struct fcloop_nport *nport)
818 {
819 return kref_get_unless_zero(&nport->ref);
820 }
821
822 static void
823 fcloop_localport_delete(struct nvme_fc_local_port *localport)
824 {
825 struct fcloop_lport_priv *lport_priv = localport->private;
826 struct fcloop_lport *lport = lport_priv->lport;
827
828 /* release any threads waiting for the unreg to complete */
829 complete(&lport->unreg_done);
830 }
831
832 static void
833 fcloop_remoteport_delete(struct nvme_fc_remote_port *remoteport)
834 {
835 struct fcloop_rport *rport = remoteport->private;
836
837 fcloop_nport_put(rport->nport);
838 }
839
840 static void
841 fcloop_targetport_delete(struct nvmet_fc_target_port *targetport)
842 {
843 struct fcloop_tport *tport = targetport->private;
844
845 fcloop_nport_put(tport->nport);
846 }
847
848 #define FCLOOP_HW_QUEUES 4
849 #define FCLOOP_SGL_SEGS 256
850 #define FCLOOP_DMABOUND_4G 0xFFFFFFFF
851
852 static struct nvme_fc_port_template fctemplate = {
853 .module = THIS_MODULE,
854 .localport_delete = fcloop_localport_delete,
855 .remoteport_delete = fcloop_remoteport_delete,
856 .create_queue = fcloop_create_queue,
857 .delete_queue = fcloop_delete_queue,
858 .ls_req = fcloop_ls_req,
859 .fcp_io = fcloop_fcp_req,
860 .ls_abort = fcloop_ls_abort,
861 .fcp_abort = fcloop_fcp_abort,
862 .max_hw_queues = FCLOOP_HW_QUEUES,
863 .max_sgl_segments = FCLOOP_SGL_SEGS,
864 .max_dif_sgl_segments = FCLOOP_SGL_SEGS,
865 .dma_boundary = FCLOOP_DMABOUND_4G,
866 /* sizes of additional private data for data structures */
867 .local_priv_sz = sizeof(struct fcloop_lport_priv),
868 .remote_priv_sz = sizeof(struct fcloop_rport),
869 .lsrqst_priv_sz = sizeof(struct fcloop_lsreq),
870 .fcprqst_priv_sz = sizeof(struct fcloop_ini_fcpreq),
871 };
872
873 static struct nvmet_fc_target_template tgttemplate = {
874 .targetport_delete = fcloop_targetport_delete,
875 .xmt_ls_rsp = fcloop_xmt_ls_rsp,
876 .fcp_op = fcloop_fcp_op,
877 .fcp_abort = fcloop_tgt_fcp_abort,
878 .fcp_req_release = fcloop_fcp_req_release,
879 .discovery_event = fcloop_tgt_discovery_evt,
880 .max_hw_queues = FCLOOP_HW_QUEUES,
881 .max_sgl_segments = FCLOOP_SGL_SEGS,
882 .max_dif_sgl_segments = FCLOOP_SGL_SEGS,
883 .dma_boundary = FCLOOP_DMABOUND_4G,
884 /* optional features */
885 .target_features = 0,
886 /* sizes of additional private data for data structures */
887 .target_priv_sz = sizeof(struct fcloop_tport),
888 };
889
890 static ssize_t
891 fcloop_create_local_port(struct device *dev, struct device_attribute *attr,
892 const char *buf, size_t count)
893 {
894 struct nvme_fc_port_info pinfo;
895 struct fcloop_ctrl_options *opts;
896 struct nvme_fc_local_port *localport;
897 struct fcloop_lport *lport;
898 struct fcloop_lport_priv *lport_priv;
899 unsigned long flags;
900 int ret = -ENOMEM;
901
902 lport = kzalloc(sizeof(*lport), GFP_KERNEL);
903 if (!lport)
904 return -ENOMEM;
905
906 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
907 if (!opts)
908 goto out_free_lport;
909
910 ret = fcloop_parse_options(opts, buf);
911 if (ret)
912 goto out_free_opts;
913
914 /* everything there ? */
915 if ((opts->mask & LPORT_OPTS) != LPORT_OPTS) {
916 ret = -EINVAL;
917 goto out_free_opts;
918 }
919
920 memset(&pinfo, 0, sizeof(pinfo));
921 pinfo.node_name = opts->wwnn;
922 pinfo.port_name = opts->wwpn;
923 pinfo.port_role = opts->roles;
924 pinfo.port_id = opts->fcaddr;
925
926 ret = nvme_fc_register_localport(&pinfo, &fctemplate, NULL, &localport);
927 if (!ret) {
928 /* success */
929 lport_priv = localport->private;
930 lport_priv->lport = lport;
931
932 lport->localport = localport;
933 INIT_LIST_HEAD(&lport->lport_list);
934
935 spin_lock_irqsave(&fcloop_lock, flags);
936 list_add_tail(&lport->lport_list, &fcloop_lports);
937 spin_unlock_irqrestore(&fcloop_lock, flags);
938 }
939
940 out_free_opts:
941 kfree(opts);
942 out_free_lport:
943 /* free only if we're going to fail */
944 if (ret)
945 kfree(lport);
946
947 return ret ? ret : count;
948 }
949
950
951 static void
952 __unlink_local_port(struct fcloop_lport *lport)
953 {
954 list_del(&lport->lport_list);
955 }
956
957 static int
958 __wait_localport_unreg(struct fcloop_lport *lport)
959 {
960 int ret;
961
962 init_completion(&lport->unreg_done);
963
964 ret = nvme_fc_unregister_localport(lport->localport);
965
966 wait_for_completion(&lport->unreg_done);
967
968 kfree(lport);
969
970 return ret;
971 }
972
973
974 static ssize_t
975 fcloop_delete_local_port(struct device *dev, struct device_attribute *attr,
976 const char *buf, size_t count)
977 {
978 struct fcloop_lport *tlport, *lport = NULL;
979 u64 nodename, portname;
980 unsigned long flags;
981 int ret;
982
983 ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
984 if (ret)
985 return ret;
986
987 spin_lock_irqsave(&fcloop_lock, flags);
988
989 list_for_each_entry(tlport, &fcloop_lports, lport_list) {
990 if (tlport->localport->node_name == nodename &&
991 tlport->localport->port_name == portname) {
992 lport = tlport;
993 __unlink_local_port(lport);
994 break;
995 }
996 }
997 spin_unlock_irqrestore(&fcloop_lock, flags);
998
999 if (!lport)
1000 return -ENOENT;
1001
1002 ret = __wait_localport_unreg(lport);
1003
1004 return ret ? ret : count;
1005 }
1006
1007 static struct fcloop_nport *
1008 fcloop_alloc_nport(const char *buf, size_t count, bool remoteport)
1009 {
1010 struct fcloop_nport *newnport, *nport = NULL;
1011 struct fcloop_lport *tmplport, *lport = NULL;
1012 struct fcloop_ctrl_options *opts;
1013 unsigned long flags;
1014 u32 opts_mask = (remoteport) ? RPORT_OPTS : TGTPORT_OPTS;
1015 int ret;
1016
1017 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1018 if (!opts)
1019 return NULL;
1020
1021 ret = fcloop_parse_options(opts, buf);
1022 if (ret)
1023 goto out_free_opts;
1024
1025 /* everything there ? */
1026 if ((opts->mask & opts_mask) != opts_mask) {
1027 ret = -EINVAL;
1028 goto out_free_opts;
1029 }
1030
1031 newnport = kzalloc(sizeof(*newnport), GFP_KERNEL);
1032 if (!newnport)
1033 goto out_free_opts;
1034
1035 INIT_LIST_HEAD(&newnport->nport_list);
1036 newnport->node_name = opts->wwnn;
1037 newnport->port_name = opts->wwpn;
1038 if (opts->mask & NVMF_OPT_ROLES)
1039 newnport->port_role = opts->roles;
1040 if (opts->mask & NVMF_OPT_FCADDR)
1041 newnport->port_id = opts->fcaddr;
1042 kref_init(&newnport->ref);
1043
1044 spin_lock_irqsave(&fcloop_lock, flags);
1045
1046 list_for_each_entry(tmplport, &fcloop_lports, lport_list) {
1047 if (tmplport->localport->node_name == opts->wwnn &&
1048 tmplport->localport->port_name == opts->wwpn)
1049 goto out_invalid_opts;
1050
1051 if (tmplport->localport->node_name == opts->lpwwnn &&
1052 tmplport->localport->port_name == opts->lpwwpn)
1053 lport = tmplport;
1054 }
1055
1056 if (remoteport) {
1057 if (!lport)
1058 goto out_invalid_opts;
1059 newnport->lport = lport;
1060 }
1061
1062 list_for_each_entry(nport, &fcloop_nports, nport_list) {
1063 if (nport->node_name == opts->wwnn &&
1064 nport->port_name == opts->wwpn) {
1065 if ((remoteport && nport->rport) ||
1066 (!remoteport && nport->tport)) {
1067 nport = NULL;
1068 goto out_invalid_opts;
1069 }
1070
1071 fcloop_nport_get(nport);
1072
1073 spin_unlock_irqrestore(&fcloop_lock, flags);
1074
1075 if (remoteport)
1076 nport->lport = lport;
1077 if (opts->mask & NVMF_OPT_ROLES)
1078 nport->port_role = opts->roles;
1079 if (opts->mask & NVMF_OPT_FCADDR)
1080 nport->port_id = opts->fcaddr;
1081 goto out_free_newnport;
1082 }
1083 }
1084
1085 list_add_tail(&newnport->nport_list, &fcloop_nports);
1086
1087 spin_unlock_irqrestore(&fcloop_lock, flags);
1088
1089 kfree(opts);
1090 return newnport;
1091
1092 out_invalid_opts:
1093 spin_unlock_irqrestore(&fcloop_lock, flags);
1094 out_free_newnport:
1095 kfree(newnport);
1096 out_free_opts:
1097 kfree(opts);
1098 return nport;
1099 }
1100
1101 static ssize_t
1102 fcloop_create_remote_port(struct device *dev, struct device_attribute *attr,
1103 const char *buf, size_t count)
1104 {
1105 struct nvme_fc_remote_port *remoteport;
1106 struct fcloop_nport *nport;
1107 struct fcloop_rport *rport;
1108 struct nvme_fc_port_info pinfo;
1109 int ret;
1110
1111 nport = fcloop_alloc_nport(buf, count, true);
1112 if (!nport)
1113 return -EIO;
1114
1115 memset(&pinfo, 0, sizeof(pinfo));
1116 pinfo.node_name = nport->node_name;
1117 pinfo.port_name = nport->port_name;
1118 pinfo.port_role = nport->port_role;
1119 pinfo.port_id = nport->port_id;
1120
1121 ret = nvme_fc_register_remoteport(nport->lport->localport,
1122 &pinfo, &remoteport);
1123 if (ret || !remoteport) {
1124 fcloop_nport_put(nport);
1125 return ret;
1126 }
1127
1128 /* success */
1129 rport = remoteport->private;
1130 rport->remoteport = remoteport;
1131 rport->targetport = (nport->tport) ? nport->tport->targetport : NULL;
1132 if (nport->tport) {
1133 nport->tport->remoteport = remoteport;
1134 nport->tport->lport = nport->lport;
1135 }
1136 rport->nport = nport;
1137 rport->lport = nport->lport;
1138 nport->rport = rport;
1139
1140 return count;
1141 }
1142
1143
1144 static struct fcloop_rport *
1145 __unlink_remote_port(struct fcloop_nport *nport)
1146 {
1147 struct fcloop_rport *rport = nport->rport;
1148
1149 if (rport && nport->tport)
1150 nport->tport->remoteport = NULL;
1151 nport->rport = NULL;
1152
1153 return rport;
1154 }
1155
1156 static int
1157 __remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport)
1158 {
1159 if (!rport)
1160 return -EALREADY;
1161
1162 return nvme_fc_unregister_remoteport(rport->remoteport);
1163 }
1164
1165 static ssize_t
1166 fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr,
1167 const char *buf, size_t count)
1168 {
1169 struct fcloop_nport *nport = NULL, *tmpport;
1170 static struct fcloop_rport *rport;
1171 u64 nodename, portname;
1172 unsigned long flags;
1173 int ret;
1174
1175 ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
1176 if (ret)
1177 return ret;
1178
1179 spin_lock_irqsave(&fcloop_lock, flags);
1180
1181 list_for_each_entry(tmpport, &fcloop_nports, nport_list) {
1182 if (tmpport->node_name == nodename &&
1183 tmpport->port_name == portname && tmpport->rport) {
1184 nport = tmpport;
1185 rport = __unlink_remote_port(nport);
1186 break;
1187 }
1188 }
1189
1190 spin_unlock_irqrestore(&fcloop_lock, flags);
1191
1192 if (!nport)
1193 return -ENOENT;
1194
1195 ret = __remoteport_unreg(nport, rport);
1196
1197 return ret ? ret : count;
1198 }
1199
1200 static ssize_t
1201 fcloop_create_target_port(struct device *dev, struct device_attribute *attr,
1202 const char *buf, size_t count)
1203 {
1204 struct nvmet_fc_target_port *targetport;
1205 struct fcloop_nport *nport;
1206 struct fcloop_tport *tport;
1207 struct nvmet_fc_port_info tinfo;
1208 int ret;
1209
1210 nport = fcloop_alloc_nport(buf, count, false);
1211 if (!nport)
1212 return -EIO;
1213
1214 tinfo.node_name = nport->node_name;
1215 tinfo.port_name = nport->port_name;
1216 tinfo.port_id = nport->port_id;
1217
1218 ret = nvmet_fc_register_targetport(&tinfo, &tgttemplate, NULL,
1219 &targetport);
1220 if (ret) {
1221 fcloop_nport_put(nport);
1222 return ret;
1223 }
1224
1225 /* success */
1226 tport = targetport->private;
1227 tport->targetport = targetport;
1228 tport->remoteport = (nport->rport) ? nport->rport->remoteport : NULL;
1229 if (nport->rport)
1230 nport->rport->targetport = targetport;
1231 tport->nport = nport;
1232 tport->lport = nport->lport;
1233 nport->tport = tport;
1234
1235 return count;
1236 }
1237
1238
1239 static struct fcloop_tport *
1240 __unlink_target_port(struct fcloop_nport *nport)
1241 {
1242 struct fcloop_tport *tport = nport->tport;
1243
1244 if (tport && nport->rport)
1245 nport->rport->targetport = NULL;
1246 nport->tport = NULL;
1247
1248 return tport;
1249 }
1250
1251 static int
1252 __targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport)
1253 {
1254 if (!tport)
1255 return -EALREADY;
1256
1257 return nvmet_fc_unregister_targetport(tport->targetport);
1258 }
1259
1260 static ssize_t
1261 fcloop_delete_target_port(struct device *dev, struct device_attribute *attr,
1262 const char *buf, size_t count)
1263 {
1264 struct fcloop_nport *nport = NULL, *tmpport;
1265 struct fcloop_tport *tport = NULL;
1266 u64 nodename, portname;
1267 unsigned long flags;
1268 int ret;
1269
1270 ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
1271 if (ret)
1272 return ret;
1273
1274 spin_lock_irqsave(&fcloop_lock, flags);
1275
1276 list_for_each_entry(tmpport, &fcloop_nports, nport_list) {
1277 if (tmpport->node_name == nodename &&
1278 tmpport->port_name == portname && tmpport->tport) {
1279 nport = tmpport;
1280 tport = __unlink_target_port(nport);
1281 break;
1282 }
1283 }
1284
1285 spin_unlock_irqrestore(&fcloop_lock, flags);
1286
1287 if (!nport)
1288 return -ENOENT;
1289
1290 ret = __targetport_unreg(nport, tport);
1291
1292 return ret ? ret : count;
1293 }
1294
1295
1296 static DEVICE_ATTR(add_local_port, 0200, NULL, fcloop_create_local_port);
1297 static DEVICE_ATTR(del_local_port, 0200, NULL, fcloop_delete_local_port);
1298 static DEVICE_ATTR(add_remote_port, 0200, NULL, fcloop_create_remote_port);
1299 static DEVICE_ATTR(del_remote_port, 0200, NULL, fcloop_delete_remote_port);
1300 static DEVICE_ATTR(add_target_port, 0200, NULL, fcloop_create_target_port);
1301 static DEVICE_ATTR(del_target_port, 0200, NULL, fcloop_delete_target_port);
1302
1303 static struct attribute *fcloop_dev_attrs[] = {
1304 &dev_attr_add_local_port.attr,
1305 &dev_attr_del_local_port.attr,
1306 &dev_attr_add_remote_port.attr,
1307 &dev_attr_del_remote_port.attr,
1308 &dev_attr_add_target_port.attr,
1309 &dev_attr_del_target_port.attr,
1310 NULL
1311 };
1312
1313 static struct attribute_group fclopp_dev_attrs_group = {
1314 .attrs = fcloop_dev_attrs,
1315 };
1316
1317 static const struct attribute_group *fcloop_dev_attr_groups[] = {
1318 &fclopp_dev_attrs_group,
1319 NULL,
1320 };
1321
1322 static struct class *fcloop_class;
1323 static struct device *fcloop_device;
1324
1325
1326 static int __init fcloop_init(void)
1327 {
1328 int ret;
1329
1330 fcloop_class = class_create(THIS_MODULE, "fcloop");
1331 if (IS_ERR(fcloop_class)) {
1332 pr_err("couldn't register class fcloop\n");
1333 ret = PTR_ERR(fcloop_class);
1334 return ret;
1335 }
1336
1337 fcloop_device = device_create_with_groups(
1338 fcloop_class, NULL, MKDEV(0, 0), NULL,
1339 fcloop_dev_attr_groups, "ctl");
1340 if (IS_ERR(fcloop_device)) {
1341 pr_err("couldn't create ctl device!\n");
1342 ret = PTR_ERR(fcloop_device);
1343 goto out_destroy_class;
1344 }
1345
1346 get_device(fcloop_device);
1347
1348 return 0;
1349
1350 out_destroy_class:
1351 class_destroy(fcloop_class);
1352 return ret;
1353 }
1354
1355 static void __exit fcloop_exit(void)
1356 {
1357 struct fcloop_lport *lport;
1358 struct fcloop_nport *nport;
1359 struct fcloop_tport *tport;
1360 struct fcloop_rport *rport;
1361 unsigned long flags;
1362 int ret;
1363
1364 spin_lock_irqsave(&fcloop_lock, flags);
1365
1366 for (;;) {
1367 nport = list_first_entry_or_null(&fcloop_nports,
1368 typeof(*nport), nport_list);
1369 if (!nport)
1370 break;
1371
1372 tport = __unlink_target_port(nport);
1373 rport = __unlink_remote_port(nport);
1374
1375 spin_unlock_irqrestore(&fcloop_lock, flags);
1376
1377 ret = __targetport_unreg(nport, tport);
1378 if (ret)
1379 pr_warn("%s: Failed deleting target port\n", __func__);
1380
1381 ret = __remoteport_unreg(nport, rport);
1382 if (ret)
1383 pr_warn("%s: Failed deleting remote port\n", __func__);
1384
1385 spin_lock_irqsave(&fcloop_lock, flags);
1386 }
1387
1388 for (;;) {
1389 lport = list_first_entry_or_null(&fcloop_lports,
1390 typeof(*lport), lport_list);
1391 if (!lport)
1392 break;
1393
1394 __unlink_local_port(lport);
1395
1396 spin_unlock_irqrestore(&fcloop_lock, flags);
1397
1398 ret = __wait_localport_unreg(lport);
1399 if (ret)
1400 pr_warn("%s: Failed deleting local port\n", __func__);
1401
1402 spin_lock_irqsave(&fcloop_lock, flags);
1403 }
1404
1405 spin_unlock_irqrestore(&fcloop_lock, flags);
1406
1407 put_device(fcloop_device);
1408
1409 device_destroy(fcloop_class, MKDEV(0, 0));
1410 class_destroy(fcloop_class);
1411 }
1412
1413 module_init(fcloop_init);
1414 module_exit(fcloop_exit);
1415
1416 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support