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Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
[linux-block.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
33 */
34
aef9ec39
RD		 35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/string.h>
40#include <linux/parser.h>
41#include <linux/random.h>
42
43#include <asm/atomic.h>
44
45#include <scsi/scsi.h>
46#include <scsi/scsi_device.h>
47#include <scsi/scsi_dbg.h>
48#include <scsi/srp.h>
49
50#include <rdma/ib_cache.h>
51
52#include "ib_srp.h"
53
54#define DRV_NAME "ib_srp"
55#define PFX DRV_NAME ": "
56#define DRV_VERSION "0.2"
57#define DRV_RELDATE "November 1, 2005"
58
59MODULE_AUTHOR("Roland Dreier");
60MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
61 "v" DRV_VERSION " (" DRV_RELDATE ")");
62MODULE_LICENSE("Dual BSD/GPL");
63
64static int topspin_workarounds = 1;
65
66module_param(topspin_workarounds, int, 0444);
67MODULE_PARM_DESC(topspin_workarounds,
68 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
69
70static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
71
72static void srp_add_one(struct ib_device *device);
73static void srp_remove_one(struct ib_device *device);
74static void srp_completion(struct ib_cq *cq, void *target_ptr);
75static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
76
77static struct ib_client srp_client = {
78 .name = "srp",
79 .add = srp_add_one,
80 .remove = srp_remove_one
81};
82
83static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
84{
85 return (struct srp_target_port *) host->hostdata;
86}
87
88static const char *srp_target_info(struct Scsi_Host *host)
89{
90 return host_to_target(host)->target_name;
91}
92
93static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
94 gfp_t gfp_mask,
95 enum dma_data_direction direction)
96{
97 struct srp_iu *iu;
98
99 iu = kmalloc(sizeof *iu, gfp_mask);
100 if (!iu)
101 goto out;
102
103 iu->buf = kzalloc(size, gfp_mask);
104 if (!iu->buf)
105 goto out_free_iu;
106
107 iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
108 if (dma_mapping_error(iu->dma))
109 goto out_free_buf;
110
111 iu->size = size;
112 iu->direction = direction;
113
114 return iu;
115
116out_free_buf:
117 kfree(iu->buf);
118out_free_iu:
119 kfree(iu);
120out:
121 return NULL;
122}
123
124static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
125{
126 if (!iu)
127 return;
128
129 dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
130 kfree(iu->buf);
131 kfree(iu);
132}
133
134static void srp_qp_event(struct ib_event *event, void *context)
135{
136 printk(KERN_ERR PFX "QP event %d\n", event->event);
137}
138
139static int srp_init_qp(struct srp_target_port *target,
140 struct ib_qp *qp)
141{
142 struct ib_qp_attr *attr;
143 int ret;
144
145 attr = kmalloc(sizeof *attr, GFP_KERNEL);
146 if (!attr)
147 return -ENOMEM;
148
149 ret = ib_find_cached_pkey(target->srp_host->dev,
150 target->srp_host->port,
151 be16_to_cpu(target->path.pkey),
152 &attr->pkey_index);
153 if (ret)
154 goto out;
155
156 attr->qp_state = IB_QPS_INIT;
157 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
158 IB_ACCESS_REMOTE_WRITE);
159 attr->port_num = target->srp_host->port;
160
161 ret = ib_modify_qp(qp, attr,
162 IB_QP_STATE |
163 IB_QP_PKEY_INDEX |
164 IB_QP_ACCESS_FLAGS |
165 IB_QP_PORT);
166
167out:
168 kfree(attr);
169 return ret;
170}
171
172static int srp_create_target_ib(struct srp_target_port *target)
173{
174 struct ib_qp_init_attr *init_attr;
175 int ret;
176
177 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
178 if (!init_attr)
179 return -ENOMEM;
180
181 target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
182 NULL, target, SRP_CQ_SIZE);
183 if (IS_ERR(target->cq)) {
184 ret = PTR_ERR(target->cq);
185 goto out;
186 }
187
188 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
189
190 init_attr->event_handler = srp_qp_event;
191 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
192 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
193 init_attr->cap.max_recv_sge = 1;
194 init_attr->cap.max_send_sge = 1;
195 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
196 init_attr->qp_type = IB_QPT_RC;
197 init_attr->send_cq = target->cq;
198 init_attr->recv_cq = target->cq;
199
200 target->qp = ib_create_qp(target->srp_host->pd, init_attr);
201 if (IS_ERR(target->qp)) {
202 ret = PTR_ERR(target->qp);
203 ib_destroy_cq(target->cq);
204 goto out;
205 }
206
207 ret = srp_init_qp(target, target->qp);
208 if (ret) {
209 ib_destroy_qp(target->qp);
210 ib_destroy_cq(target->cq);
211 goto out;
212 }
213
214out:
215 kfree(init_attr);
216 return ret;
217}
218
219static void srp_free_target_ib(struct srp_target_port *target)
220{
221 int i;
222
223 ib_destroy_qp(target->qp);
224 ib_destroy_cq(target->cq);
225
226 for (i = 0; i < SRP_RQ_SIZE; ++i)
227 srp_free_iu(target->srp_host, target->rx_ring[i]);
228 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
229 srp_free_iu(target->srp_host, target->tx_ring[i]);
230}
231
232static void srp_path_rec_completion(int status,
233 struct ib_sa_path_rec *pathrec,
234 void *target_ptr)
235{
236 struct srp_target_port *target = target_ptr;
237
238 target->status = status;
239 if (status)
240 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
241 else
242 target->path = *pathrec;
243 complete(&target->done);
244}
245
246static int srp_lookup_path(struct srp_target_port *target)
247{
248 target->path.numb_path = 1;
249
250 init_completion(&target->done);
251
252 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
253 target->srp_host->port,
254 &target->path,
255 IB_SA_PATH_REC_DGID |
256 IB_SA_PATH_REC_SGID |
257 IB_SA_PATH_REC_NUMB_PATH |
258 IB_SA_PATH_REC_PKEY,
259 SRP_PATH_REC_TIMEOUT_MS,
260 GFP_KERNEL,
261 srp_path_rec_completion,
262 target, &target->path_query);
263 if (target->path_query_id < 0)
264 return target->path_query_id;
265
266 wait_for_completion(&target->done);
267
268 if (target->status < 0)
269 printk(KERN_WARNING PFX "Path record query failed\n");
270
271 return target->status;
272}
273
274static int srp_send_req(struct srp_target_port *target)
275{
276 struct {
277 struct ib_cm_req_param param;
278 struct srp_login_req priv;
279 } *req = NULL;
280 int status;
281
282 req = kzalloc(sizeof *req, GFP_KERNEL);
283 if (!req)
284 return -ENOMEM;
285
286 req->param.primary_path = &target->path;
287 req->param.alternate_path = NULL;
288 req->param.service_id = target->service_id;
289 req->param.qp_num = target->qp->qp_num;
290 req->param.qp_type = target->qp->qp_type;
291 req->param.private_data = &req->priv;
292 req->param.private_data_len = sizeof req->priv;
293 req->param.flow_control = 1;
294
295 get_random_bytes(&req->param.starting_psn, 4);
296 req->param.starting_psn &= 0xffffff;
297
298 /*
299 * Pick some arbitrary defaults here; we could make these
300 * module parameters if anyone cared about setting them.
301 */
302 req->param.responder_resources = 4;
303 req->param.remote_cm_response_timeout = 20;
304 req->param.local_cm_response_timeout = 20;
305 req->param.retry_count = 7;
306 req->param.rnr_retry_count = 7;
307 req->param.max_cm_retries = 15;
308
309 req->priv.opcode = SRP_LOGIN_REQ;
310 req->priv.tag = 0;
311 req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
312 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
313 SRP_BUF_FORMAT_INDIRECT);
314 memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
315 /*
316 * Topspin/Cisco SRP targets will reject our login unless we
317 * zero out the first 8 bytes of our initiator port ID. The
318 * second 8 bytes must be our local node GUID, but we always
319 * use that anyway.
320 */
321 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
322 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
323 "activated for target GUID %016llx\n",
324 (unsigned long long) be64_to_cpu(target->ioc_guid));
325 memset(req->priv.initiator_port_id, 0, 8);
326 }
327 memcpy(req->priv.target_port_id, &target->id_ext, 8);
328 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
329
330 status = ib_send_cm_req(target->cm_id, &req->param);
331
332 kfree(req);
333
334 return status;
335}
336
337static void srp_disconnect_target(struct srp_target_port *target)
338{
339 /* XXX should send SRP_I_LOGOUT request */
340
341 init_completion(&target->done);
342 ib_send_cm_dreq(target->cm_id, NULL, 0);
343 wait_for_completion(&target->done);
344}
345
346static void srp_remove_work(void *target_ptr)
347{
348 struct srp_target_port *target = target_ptr;
349
350 spin_lock_irq(target->scsi_host->host_lock);
351 if (target->state != SRP_TARGET_DEAD) {
352 spin_unlock_irq(target->scsi_host->host_lock);
353 scsi_host_put(target->scsi_host);
354 return;
355 }
356 target->state = SRP_TARGET_REMOVED;
357 spin_unlock_irq(target->scsi_host->host_lock);
358
359 down(&target->srp_host->target_mutex);
360 list_del(&target->list);
361 up(&target->srp_host->target_mutex);
362
363 scsi_remove_host(target->scsi_host);
364 ib_destroy_cm_id(target->cm_id);
365 srp_free_target_ib(target);
366 scsi_host_put(target->scsi_host);
367 /* And another put to really free the target port... */
368 scsi_host_put(target->scsi_host);
369}
370
371static int srp_connect_target(struct srp_target_port *target)
372{
373 int ret;
374
375 ret = srp_lookup_path(target);
376 if (ret)
377 return ret;
378
379 while (1) {
380 init_completion(&target->done);
381 ret = srp_send_req(target);
382 if (ret)
383 return ret;
384 wait_for_completion(&target->done);
385
386 /*
387 * The CM event handling code will set status to
388 * SRP_PORT_REDIRECT if we get a port redirect REJ
389 * back, or SRP_DLID_REDIRECT if we get a lid/qp
390 * redirect REJ back.
391 */
392 switch (target->status) {
393 case 0:
394 return 0;
395
396 case SRP_PORT_REDIRECT:
397 ret = srp_lookup_path(target);
398 if (ret)
399 return ret;
400 break;
401
402 case SRP_DLID_REDIRECT:
403 break;
404
405 default:
406 return target->status;
407 }
408 }
409}
410
411static int srp_reconnect_target(struct srp_target_port *target)
412{
413 struct ib_cm_id *new_cm_id;
414 struct ib_qp_attr qp_attr;
415 struct srp_request *req;
416 struct ib_wc wc;
417 int ret;
418 int i;
419
420 spin_lock_irq(target->scsi_host->host_lock);
421 if (target->state != SRP_TARGET_LIVE) {
422 spin_unlock_irq(target->scsi_host->host_lock);
423 return -EAGAIN;
424 }
425 target->state = SRP_TARGET_CONNECTING;
426 spin_unlock_irq(target->scsi_host->host_lock);
427
428 srp_disconnect_target(target);
429 /*
430 * Now get a new local CM ID so that we avoid confusing the
431 * target in case things are really fouled up.
432 */
433 new_cm_id = ib_create_cm_id(target->srp_host->dev,
434 srp_cm_handler, target);
435 if (IS_ERR(new_cm_id)) {
436 ret = PTR_ERR(new_cm_id);
437 goto err;
438 }
439 ib_destroy_cm_id(target->cm_id);
440 target->cm_id = new_cm_id;
441
442 qp_attr.qp_state = IB_QPS_RESET;
443 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
444 if (ret)
445 goto err;
446
447 ret = srp_init_qp(target, target->qp);
448 if (ret)
449 goto err;
450
451 while (ib_poll_cq(target->cq, 1, &wc) > 0)
452 ; /* nothing */
453
454 list_for_each_entry(req, &target->req_queue, list) {
455 req->scmnd->result = DID_RESET << 16;
456 req->scmnd->scsi_done(req->scmnd);
457 }
458
459 target->rx_head = 0;
460 target->tx_head = 0;
461 target->tx_tail = 0;
462 target->req_head = 0;
463 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
464 target->req_ring[i].next = i + 1;
465 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
466 INIT_LIST_HEAD(&target->req_queue);
467
468 ret = srp_connect_target(target);
469 if (ret)
470 goto err;
471
472 spin_lock_irq(target->scsi_host->host_lock);
473 if (target->state == SRP_TARGET_CONNECTING) {
474 ret = 0;
475 target->state = SRP_TARGET_LIVE;
476 } else
477 ret = -EAGAIN;
478 spin_unlock_irq(target->scsi_host->host_lock);
479
480 return ret;
481
482err:
483 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
484
485 /*
486 * We couldn't reconnect, so kill our target port off.
487 * However, we have to defer the real removal because we might
488 * be in the context of the SCSI error handler now, which
489 * would deadlock if we call scsi_remove_host().
490 */
491 spin_lock_irq(target->scsi_host->host_lock);
492 if (target->state == SRP_TARGET_CONNECTING) {
493 target->state = SRP_TARGET_DEAD;
494 INIT_WORK(&target->work, srp_remove_work, target);
495 schedule_work(&target->work);
496 }
497 spin_unlock_irq(target->scsi_host->host_lock);
498
499 return ret;
500}
501
502static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
503 struct srp_request *req)
504{
505 struct srp_cmd *cmd = req->cmd->buf;
506 int len;
507 u8 fmt;
508
509 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
510 return sizeof (struct srp_cmd);
511
512 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
513 scmnd->sc_data_direction != DMA_TO_DEVICE) {
514 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
515 scmnd->sc_data_direction);
516 return -EINVAL;
517 }
518
519 if (scmnd->use_sg) {
520 struct scatterlist *scat = scmnd->request_buffer;
521 int n;
522 int i;
523
524 n = dma_map_sg(target->srp_host->dev->dma_device,
525 scat, scmnd->use_sg, scmnd->sc_data_direction);
526
527 if (n == 1) {
528 struct srp_direct_buf *buf = (void *) cmd->add_data;
529
530 fmt = SRP_DATA_DESC_DIRECT;
531
532 buf->va = cpu_to_be64(sg_dma_address(scat));
533 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
534 buf->len = cpu_to_be32(sg_dma_len(scat));
535
536 len = sizeof (struct srp_cmd) +
537 sizeof (struct srp_direct_buf);
538 } else {
539 struct srp_indirect_buf *buf = (void *) cmd->add_data;
540 u32 datalen = 0;
541
542 fmt = SRP_DATA_DESC_INDIRECT;
543
544 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
545 cmd->data_out_desc_cnt = n;
546 else
547 cmd->data_in_desc_cnt = n;
548
549 buf->table_desc.va = cpu_to_be64(req->cmd->dma +
550 sizeof *cmd +
551 sizeof *buf);
552 buf->table_desc.key =
553 cpu_to_be32(target->srp_host->mr->rkey);
554 buf->table_desc.len =
555 cpu_to_be32(n * sizeof (struct srp_direct_buf));
556
557 for (i = 0; i < n; ++i) {
558 buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
559 buf->desc_list[i].key =
560 cpu_to_be32(target->srp_host->mr->rkey);
561 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
562
563 datalen += sg_dma_len(&scat[i]);
564 }
565
566 buf->len = cpu_to_be32(datalen);
567
568 len = sizeof (struct srp_cmd) +
569 sizeof (struct srp_indirect_buf) +
570 n * sizeof (struct srp_direct_buf);
571 }
572 } else {
573 struct srp_direct_buf *buf = (void *) cmd->add_data;
574 dma_addr_t dma;
575
576 dma = dma_map_single(target->srp_host->dev->dma_device,
577 scmnd->request_buffer, scmnd->request_bufflen,
578 scmnd->sc_data_direction);
579 if (dma_mapping_error(dma)) {
580 printk(KERN_WARNING PFX "unable to map %p/%d (dir %d)\n",
581 scmnd->request_buffer, (int) scmnd->request_bufflen,
582 scmnd->sc_data_direction);
583 return -EINVAL;
584 }
585
586 pci_unmap_addr_set(req, direct_mapping, dma);
587
588 buf->va = cpu_to_be64(dma);
589 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
590 buf->len = cpu_to_be32(scmnd->request_bufflen);
591
592 fmt = SRP_DATA_DESC_DIRECT;
593
594 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
595 }
596
597 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
598 cmd->buf_fmt = fmt << 4;
599 else
600 cmd->buf_fmt = fmt;
601
602
603 return len;
604}
605
606static void srp_unmap_data(struct scsi_cmnd *scmnd,
607 struct srp_target_port *target,
608 struct srp_request *req)
609{
610 if (!scmnd->request_buffer ||
611 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
612 scmnd->sc_data_direction != DMA_FROM_DEVICE))
613 return;
614
615 if (scmnd->use_sg)
616 dma_unmap_sg(target->srp_host->dev->dma_device,
617 (struct scatterlist *) scmnd->request_buffer,
618 scmnd->use_sg, scmnd->sc_data_direction);
619 else
620 dma_unmap_single(target->srp_host->dev->dma_device,
621 pci_unmap_addr(req, direct_mapping),
622 scmnd->request_bufflen,
623 scmnd->sc_data_direction);
624}
625
626static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
627{
628 struct srp_request *req;
629 struct scsi_cmnd *scmnd;
630 unsigned long flags;
631 s32 delta;
632
633 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
634
635 spin_lock_irqsave(target->scsi_host->host_lock, flags);
636
637 target->req_lim += delta;
638
639 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
640
641 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
642 if (be32_to_cpu(rsp->resp_data_len) < 4)
643 req->tsk_status = -1;
644 else
645 req->tsk_status = rsp->data[3];
646 complete(&req->done);
647 } else {
648 scmnd = req->scmnd;
649 if (!scmnd)
650 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
651 (unsigned long long) rsp->tag);
652 scmnd->result = rsp->status;
653
654 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
655 memcpy(scmnd->sense_buffer, rsp->data +
656 be32_to_cpu(rsp->resp_data_len),
657 min_t(int, be32_to_cpu(rsp->sense_data_len),
658 SCSI_SENSE_BUFFERSIZE));
659 }
660
661 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
662 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
663 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
664 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
665
666 srp_unmap_data(scmnd, target, req);
667
668 if (!req->tsk_mgmt) {
669 req->scmnd = NULL;
670 scmnd->host_scribble = (void *) -1L;
671 scmnd->scsi_done(scmnd);
672
673 list_del(&req->list);
674 req->next = target->req_head;
675 target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
676 } else
677 req->cmd_done = 1;
678 }
679
680 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
681}
682
683static void srp_reconnect_work(void *target_ptr)
684{
685 struct srp_target_port *target = target_ptr;
686
687 srp_reconnect_target(target);
688}
689
690static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
691{
692 struct srp_iu *iu;
693 u8 opcode;
694
695 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
696
697 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
698 target->max_ti_iu_len, DMA_FROM_DEVICE);
699
700 opcode = *(u8 *) iu->buf;
701
702 if (0) {
703 int i;
704
705 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
706
707 for (i = 0; i < wc->byte_len; ++i) {
708 if (i % 8 == 0)
709 printk(KERN_ERR " [%02x] ", i);
710 printk(" %02x", ((u8 *) iu->buf)[i]);
711 if ((i + 1) % 8 == 0)
712 printk("\n");
713 }
714
715 if (wc->byte_len % 8)
716 printk("\n");
717 }
718
719 switch (opcode) {
720 case SRP_RSP:
721 srp_process_rsp(target, iu->buf);
722 break;
723
724 case SRP_T_LOGOUT:
725 /* XXX Handle target logout */
726 printk(KERN_WARNING PFX "Got target logout request\n");
727 break;
728
729 default:
730 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
731 break;
732 }
733
734 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
735 target->max_ti_iu_len, DMA_FROM_DEVICE);
736}
737
738static void srp_completion(struct ib_cq *cq, void *target_ptr)
739{
740 struct srp_target_port *target = target_ptr;
741 struct ib_wc wc;
742 unsigned long flags;
743
744 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
745 while (ib_poll_cq(cq, 1, &wc) > 0) {
746 if (wc.status) {
747 printk(KERN_ERR PFX "failed %s status %d\n",
748 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
749 wc.status);
750 spin_lock_irqsave(target->scsi_host->host_lock, flags);
751 if (target->state == SRP_TARGET_LIVE)
752 schedule_work(&target->work);
753 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
754 break;
755 }
756
757 if (wc.wr_id & SRP_OP_RECV)
758 srp_handle_recv(target, &wc);
759 else
760 ++target->tx_tail;
761 }
762}
763
764static int __srp_post_recv(struct srp_target_port *target)
765{
766 struct srp_iu *iu;
767 struct ib_sge list;
768 struct ib_recv_wr wr, *bad_wr;
769 unsigned int next;
770 int ret;
771
772 next = target->rx_head & (SRP_RQ_SIZE - 1);
773 wr.wr_id = next | SRP_OP_RECV;
774 iu = target->rx_ring[next];
775
776 list.addr = iu->dma;
777 list.length = iu->size;
778 list.lkey = target->srp_host->mr->lkey;
779
780 wr.next = NULL;
781 wr.sg_list = &list;
782 wr.num_sge = 1;
783
784 ret = ib_post_recv(target->qp, &wr, &bad_wr);
785 if (!ret)
786 ++target->rx_head;
787
788 return ret;
789}
790
791static int srp_post_recv(struct srp_target_port *target)
792{
793 unsigned long flags;
794 int ret;
795
796 spin_lock_irqsave(target->scsi_host->host_lock, flags);
797 ret = __srp_post_recv(target);
798 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
799
800 return ret;
801}
802
803/*
804 * Must be called with target->scsi_host->host_lock held to protect
805 * req_lim and tx_head.
806 */
807static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
808{
809 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
810 return NULL;
811
812 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
813}
814
815/*
816 * Must be called with target->scsi_host->host_lock held to protect
817 * req_lim and tx_head.
818 */
819static int __srp_post_send(struct srp_target_port *target,
820 struct srp_iu *iu, int len)
821{
822 struct ib_sge list;
823 struct ib_send_wr wr, *bad_wr;
824 int ret = 0;
825
826 if (target->req_lim < 1) {
827 printk(KERN_ERR PFX "Target has req_lim %d\n", target->req_lim);
828 return -EAGAIN;
829 }
830
831 list.addr = iu->dma;
832 list.length = len;
833 list.lkey = target->srp_host->mr->lkey;
834
835 wr.next = NULL;
836 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
837 wr.sg_list = &list;
838 wr.num_sge = 1;
839 wr.opcode = IB_WR_SEND;
840 wr.send_flags = IB_SEND_SIGNALED;
841
842 ret = ib_post_send(target->qp, &wr, &bad_wr);
843
844 if (!ret) {
845 ++target->tx_head;
846 --target->req_lim;
847 }
848
849 return ret;
850}
851
852static int srp_queuecommand(struct scsi_cmnd *scmnd,
853 void (*done)(struct scsi_cmnd *))
854{
855 struct srp_target_port *target = host_to_target(scmnd->device->host);
856 struct srp_request *req;
857 struct srp_iu *iu;
858 struct srp_cmd *cmd;
859 long req_index;
860 int len;
861
862 if (target->state == SRP_TARGET_CONNECTING)
863 goto err;
864
865 if (target->state == SRP_TARGET_DEAD ||
866 target->state == SRP_TARGET_REMOVED) {
867 scmnd->result = DID_BAD_TARGET << 16;
868 done(scmnd);
869 return 0;
870 }
871
872 iu = __srp_get_tx_iu(target);
873 if (!iu)
874 goto err;
875
876 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
877 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
878
879 req_index = target->req_head;
880
881 scmnd->scsi_done = done;
882 scmnd->result = 0;
883 scmnd->host_scribble = (void *) req_index;
884
885 cmd = iu->buf;
886 memset(cmd, 0, sizeof *cmd);
887
888 cmd->opcode = SRP_CMD;
889 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
890 cmd->tag = req_index;
891 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
892
893 req = &target->req_ring[req_index];
894
895 req->scmnd = scmnd;
896 req->cmd = iu;
897 req->cmd_done = 0;
898 req->tsk_mgmt = NULL;
899
900 len = srp_map_data(scmnd, target, req);
901 if (len < 0) {
902 printk(KERN_ERR PFX "Failed to map data\n");
903 goto err;
904 }
905
906 if (__srp_post_recv(target)) {
907 printk(KERN_ERR PFX "Recv failed\n");
908 goto err_unmap;
909 }
910
911 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
912 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
913
914 if (__srp_post_send(target, iu, len)) {
915 printk(KERN_ERR PFX "Send failed\n");
916 goto err_unmap;
917 }
918
919 target->req_head = req->next;
920 list_add_tail(&req->list, &target->req_queue);
921
922 return 0;
923
924err_unmap:
925 srp_unmap_data(scmnd, target, req);
926
927err:
928 return SCSI_MLQUEUE_HOST_BUSY;
929}
930
931static int srp_alloc_iu_bufs(struct srp_target_port *target)
932{
933 int i;
934
935 for (i = 0; i < SRP_RQ_SIZE; ++i) {
936 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
937 target->max_ti_iu_len,
938 GFP_KERNEL, DMA_FROM_DEVICE);
939 if (!target->rx_ring[i])
940 goto err;
941 }
942
943 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
944 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
945 SRP_MAX_IU_LEN,
946 GFP_KERNEL, DMA_TO_DEVICE);
947 if (!target->tx_ring[i])
948 goto err;
949 }
950
951 return 0;
952
953err:
954 for (i = 0; i < SRP_RQ_SIZE; ++i) {
955 srp_free_iu(target->srp_host, target->rx_ring[i]);
956 target->rx_ring[i] = NULL;
957 }
958
959 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
960 srp_free_iu(target->srp_host, target->tx_ring[i]);
961 target->tx_ring[i] = NULL;
962 }
963
964 return -ENOMEM;
965}
966
967static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
968 struct ib_cm_event *event,
969 struct srp_target_port *target)
970{
971 struct ib_class_port_info *cpi;
972 int opcode;
973
974 switch (event->param.rej_rcvd.reason) {
975 case IB_CM_REJ_PORT_CM_REDIRECT:
976 cpi = event->param.rej_rcvd.ari;
977 target->path.dlid = cpi->redirect_lid;
978 target->path.pkey = cpi->redirect_pkey;
979 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
980 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
981
982 target->status = target->path.dlid ?
983 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
984 break;
985
986 case IB_CM_REJ_PORT_REDIRECT:
987 if (topspin_workarounds &&
988 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
989 /*
990 * Topspin/Cisco SRP gateways incorrectly send
991 * reject reason code 25 when they mean 24
992 * (port redirect).
993 */
994 memcpy(target->path.dgid.raw,
995 event->param.rej_rcvd.ari, 16);
996
997 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
998 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
999 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1000
1001 target->status = SRP_PORT_REDIRECT;
1002 } else {
1003 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1004 target->status = -ECONNRESET;
1005 }
1006 break;
1007
1008 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1009 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1010 target->status = -ECONNRESET;
1011 break;
1012
1013 case IB_CM_REJ_CONSUMER_DEFINED:
1014 opcode = *(u8 *) event->private_data;
1015 if (opcode == SRP_LOGIN_REJ) {
1016 struct srp_login_rej *rej = event->private_data;
1017 u32 reason = be32_to_cpu(rej->reason);
1018
1019 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1020 printk(KERN_WARNING PFX
1021 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1022 else
1023 printk(KERN_WARNING PFX
1024 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1025 } else
1026 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1027 " opcode 0x%02x\n", opcode);
1028 target->status = -ECONNRESET;
1029 break;
1030
1031 default:
1032 printk(KERN_WARNING " REJ reason 0x%x\n",
1033 event->param.rej_rcvd.reason);
1034 target->status = -ECONNRESET;
1035 }
1036}
1037
1038static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1039{
1040 struct srp_target_port *target = cm_id->context;
1041 struct ib_qp_attr *qp_attr = NULL;
1042 int attr_mask = 0;
1043 int comp = 0;
1044 int opcode = 0;
1045
1046 switch (event->event) {
1047 case IB_CM_REQ_ERROR:
1048 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1049 comp = 1;
1050 target->status = -ECONNRESET;
1051 break;
1052
1053 case IB_CM_REP_RECEIVED:
1054 comp = 1;
1055 opcode = *(u8 *) event->private_data;
1056
1057 if (opcode == SRP_LOGIN_RSP) {
1058 struct srp_login_rsp *rsp = event->private_data;
1059
1060 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1061 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1062
1063 target->scsi_host->can_queue = min(target->req_lim,
1064 target->scsi_host->can_queue);
1065 } else {
1066 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1067 target->status = -ECONNRESET;
1068 break;
1069 }
1070
1071 target->status = srp_alloc_iu_bufs(target);
1072 if (target->status)
1073 break;
1074
1075 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1076 if (!qp_attr) {
1077 target->status = -ENOMEM;
1078 break;
1079 }
1080
1081 qp_attr->qp_state = IB_QPS_RTR;
1082 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1083 if (target->status)
1084 break;
1085
1086 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1087 if (target->status)
1088 break;
1089
1090 target->status = srp_post_recv(target);
1091 if (target->status)
1092 break;
1093
1094 qp_attr->qp_state = IB_QPS_RTS;
1095 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1096 if (target->status)
1097 break;
1098
1099 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1100 if (target->status)
1101 break;
1102
1103 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1104 if (target->status)
1105 break;
1106
1107 break;
1108
1109 case IB_CM_REJ_RECEIVED:
1110 printk(KERN_DEBUG PFX "REJ received\n");
1111 comp = 1;
1112
1113 srp_cm_rej_handler(cm_id, event, target);
1114 break;
1115
1116 case IB_CM_MRA_RECEIVED:
1117 printk(KERN_ERR PFX "MRA received\n");
1118 break;
1119
1120 case IB_CM_DREP_RECEIVED:
1121 break;
1122
1123 case IB_CM_TIMEWAIT_EXIT:
1124 printk(KERN_ERR PFX "connection closed\n");
1125
1126 comp = 1;
1127 target->status = 0;
1128 break;
1129
1130 default:
1131 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1132 break;
1133 }
1134
1135 if (comp)
1136 complete(&target->done);
1137
1138 kfree(qp_attr);
1139
1140 return 0;
1141}
1142
1143static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
1144{
1145 struct srp_target_port *target = host_to_target(scmnd->device->host);
1146 struct srp_request *req;
1147 struct srp_iu *iu;
1148 struct srp_tsk_mgmt *tsk_mgmt;
1149 int req_index;
1150 int ret = FAILED;
1151
1152 spin_lock_irq(target->scsi_host->host_lock);
1153
1154 if (scmnd->host_scribble == (void *) -1L)
1155 goto out;
1156
1157 req_index = (long) scmnd->host_scribble;
1158 printk(KERN_ERR "Abort for req_index %d\n", req_index);
1159
1160 req = &target->req_ring[req_index];
1161 init_completion(&req->done);
1162
1163 iu = __srp_get_tx_iu(target);
1164 if (!iu)
1165 goto out;
1166
1167 tsk_mgmt = iu->buf;
1168 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1169
1170 tsk_mgmt->opcode = SRP_TSK_MGMT;
1171 tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1172 tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
1173 tsk_mgmt->tsk_mgmt_func = func;
1174 tsk_mgmt->task_tag = req_index;
1175
1176 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1177 goto out;
1178
1179 req->tsk_mgmt = iu;
1180
1181 spin_unlock_irq(target->scsi_host->host_lock);
1182 if (!wait_for_completion_timeout(&req->done,
1183 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1184 return FAILED;
1185 spin_lock_irq(target->scsi_host->host_lock);
1186
1187 if (req->cmd_done) {
1188 list_del(&req->list);
1189 req->next = target->req_head;
1190 target->req_head = req_index;
1191
1192 scmnd->scsi_done(scmnd);
1193 } else if (!req->tsk_status) {
1194 scmnd->result = DID_ABORT << 16;
1195 ret = SUCCESS;
1196 }
1197
1198out:
1199 spin_unlock_irq(target->scsi_host->host_lock);
1200 return ret;
1201}
1202
1203static int srp_abort(struct scsi_cmnd *scmnd)
1204{
1205 printk(KERN_ERR "SRP abort called\n");
1206
1207 return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
1208}
1209
1210static int srp_reset_device(struct scsi_cmnd *scmnd)
1211{
1212 printk(KERN_ERR "SRP reset_device called\n");
1213
1214 return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
1215}
1216
1217static int srp_reset_host(struct scsi_cmnd *scmnd)
1218{
1219 struct srp_target_port *target = host_to_target(scmnd->device->host);
1220 int ret = FAILED;
1221
1222 printk(KERN_ERR PFX "SRP reset_host called\n");
1223
1224 if (!srp_reconnect_target(target))
1225 ret = SUCCESS;
1226
1227 return ret;
1228}
1229
1230static struct scsi_host_template srp_template = {
1231 .module = THIS_MODULE,
1232 .name = DRV_NAME,
1233 .info = srp_target_info,
1234 .queuecommand = srp_queuecommand,
1235 .eh_abort_handler = srp_abort,
1236 .eh_device_reset_handler = srp_reset_device,
1237 .eh_host_reset_handler = srp_reset_host,
1238 .can_queue = SRP_SQ_SIZE,
1239 .this_id = -1,
1240 .sg_tablesize = SRP_MAX_INDIRECT,
1241 .cmd_per_lun = SRP_SQ_SIZE,
1242 .use_clustering = ENABLE_CLUSTERING
1243};
1244
1245static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1246{
1247 sprintf(target->target_name, "SRP.T10:%016llX",
1248 (unsigned long long) be64_to_cpu(target->id_ext));
1249
1250 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1251 return -ENODEV;
1252
1253 down(&host->target_mutex);
1254 list_add_tail(&target->list, &host->target_list);
1255 up(&host->target_mutex);
1256
1257 target->state = SRP_TARGET_LIVE;
1258
1259 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1260 scsi_scan_target(&target->scsi_host->shost_gendev,
1261 0, target->scsi_id, ~0, 0);
1262
1263 return 0;
1264}
1265
1266static void srp_release_class_dev(struct class_device *class_dev)
1267{
1268 struct srp_host *host =
1269 container_of(class_dev, struct srp_host, class_dev);
1270
1271 complete(&host->released);
1272}
1273
1274static struct class srp_class = {
1275 .name = "infiniband_srp",
1276 .release = srp_release_class_dev
1277};
1278
1279/*
1280 * Target ports are added by writing
1281 *
1282 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1283 * pkey=<P_Key>,service_id=<service ID>
1284 *
1285 * to the add_target sysfs attribute.
1286 */
1287enum {
1288 SRP_OPT_ERR = 0,
1289 SRP_OPT_ID_EXT = 1 << 0,
1290 SRP_OPT_IOC_GUID = 1 << 1,
1291 SRP_OPT_DGID = 1 << 2,
1292 SRP_OPT_PKEY = 1 << 3,
1293 SRP_OPT_SERVICE_ID = 1 << 4,
1294 SRP_OPT_MAX_SECT = 1 << 5,
1295 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1296 SRP_OPT_IOC_GUID |
1297 SRP_OPT_DGID |
1298 SRP_OPT_PKEY |
1299 SRP_OPT_SERVICE_ID),
1300};
1301
1302static match_table_t srp_opt_tokens = {
1303 { SRP_OPT_ID_EXT, "id_ext=%s" },
1304 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1305 { SRP_OPT_DGID, "dgid=%s" },
1306 { SRP_OPT_PKEY, "pkey=%x" },
1307 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1308 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1309 { SRP_OPT_ERR, NULL }
1310};
1311
1312static int srp_parse_options(const char *buf, struct srp_target_port *target)
1313{
1314 char *options, *sep_opt;
1315 char *p;
1316 char dgid[3];
1317 substring_t args[MAX_OPT_ARGS];
1318 int opt_mask = 0;
1319 int token;
1320 int ret = -EINVAL;
1321 int i;
1322
1323 options = kstrdup(buf, GFP_KERNEL);
1324 if (!options)
1325 return -ENOMEM;
1326
1327 sep_opt = options;
1328 while ((p = strsep(&sep_opt, ",")) != NULL) {
1329 if (!*p)
1330 continue;
1331
1332 token = match_token(p, srp_opt_tokens, args);
1333 opt_mask |= token;
1334
1335 switch (token) {
1336 case SRP_OPT_ID_EXT:
1337 p = match_strdup(args);
1338 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1339 kfree(p);
1340 break;
1341
1342 case SRP_OPT_IOC_GUID:
1343 p = match_strdup(args);
1344 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1345 kfree(p);
1346 break;
1347
1348 case SRP_OPT_DGID:
1349 p = match_strdup(args);
1350 if (strlen(p) != 32) {
1351 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1352 goto out;
1353 }
1354
1355 for (i = 0; i < 16; ++i) {
1356 strlcpy(dgid, p + i * 2, 3);
1357 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1358 }
1359 break;
1360
1361 case SRP_OPT_PKEY:
1362 if (match_hex(args, &token)) {
1363 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1364 goto out;
1365 }
1366 target->path.pkey = cpu_to_be16(token);
1367 break;
1368
1369 case SRP_OPT_SERVICE_ID:
1370 p = match_strdup(args);
1371 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1372 kfree(p);
1373 break;
1374
1375 case SRP_OPT_MAX_SECT:
1376 if (match_int(args, &token)) {
1377 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1378 goto out;
1379 }
1380 target->scsi_host->max_sectors = token;
1381 break;
1382
1383 default:
1384 printk(KERN_WARNING PFX "unknown parameter or missing value "
1385 "'%s' in target creation request\n", p);
1386 goto out;
1387 }
1388 }
1389
1390 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1391 ret = 0;
1392 else
1393 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1394 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1395 !(srp_opt_tokens[i].token & opt_mask))
1396 printk(KERN_WARNING PFX "target creation request is "
1397 "missing parameter '%s'\n",
1398 srp_opt_tokens[i].pattern);
1399
1400out:
1401 kfree(options);
1402 return ret;
1403}
1404
1405static ssize_t srp_create_target(struct class_device *class_dev,
1406 const char *buf, size_t count)
1407{
1408 struct srp_host *host =
1409 container_of(class_dev, struct srp_host, class_dev);
1410 struct Scsi_Host *target_host;
1411 struct srp_target_port *target;
1412 int ret;
1413 int i;
1414
1415 target_host = scsi_host_alloc(&srp_template,
1416 sizeof (struct srp_target_port));
1417 if (!target_host)
1418 return -ENOMEM;
1419
1420 target = host_to_target(target_host);
1421 memset(target, 0, sizeof *target);
1422
1423 target->scsi_host = target_host;
1424 target->srp_host = host;
1425
1426 INIT_WORK(&target->work, srp_reconnect_work, target);
1427
1428 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
1429 target->req_ring[i].next = i + 1;
1430 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
1431 INIT_LIST_HEAD(&target->req_queue);
1432
1433 ret = srp_parse_options(buf, target);
1434 if (ret)
1435 goto err;
1436
1437 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1438
1439 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1440 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1441 (unsigned long long) be64_to_cpu(target->id_ext),
1442 (unsigned long long) be64_to_cpu(target->ioc_guid),
1443 be16_to_cpu(target->path.pkey),
1444 (unsigned long long) be64_to_cpu(target->service_id),
1445 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1446 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1447 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1448 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1449 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1450 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1451 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1452 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1453
1454 ret = srp_create_target_ib(target);
1455 if (ret)
1456 goto err;
1457
1458 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1459 if (IS_ERR(target->cm_id)) {
1460 ret = PTR_ERR(target->cm_id);
1461 goto err_free;
1462 }
1463
1464 ret = srp_connect_target(target);
1465 if (ret) {
1466 printk(KERN_ERR PFX "Connection failed\n");
1467 goto err_cm_id;
1468 }
1469
1470 ret = srp_add_target(host, target);
1471 if (ret)
1472 goto err_disconnect;
1473
1474 return count;
1475
1476err_disconnect:
1477 srp_disconnect_target(target);
1478
1479err_cm_id:
1480 ib_destroy_cm_id(target->cm_id);
1481
1482err_free:
1483 srp_free_target_ib(target);
1484
1485err:
1486 scsi_host_put(target_host);
1487
1488 return ret;
1489}
1490
1491static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1492
1493static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1494{
1495 struct srp_host *host =
1496 container_of(class_dev, struct srp_host, class_dev);
1497
1498 return sprintf(buf, "%s\n", host->dev->name);
1499}
1500
1501static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1502
1503static ssize_t show_port(struct class_device *class_dev, char *buf)
1504{
1505 struct srp_host *host =
1506 container_of(class_dev, struct srp_host, class_dev);
1507
1508 return sprintf(buf, "%d\n", host->port);
1509}
1510
1511static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1512
1513static struct srp_host *srp_add_port(struct ib_device *device,
1514 __be64 node_guid, u8 port)
1515{
1516 struct srp_host *host;
1517
1518 host = kzalloc(sizeof *host, GFP_KERNEL);
1519 if (!host)
1520 return NULL;
1521
1522 INIT_LIST_HEAD(&host->target_list);
1523 init_MUTEX(&host->target_mutex);
1524 init_completion(&host->released);
1525 host->dev = device;
1526 host->port = port;
1527
1528 host->initiator_port_id[7] = port;
1529 memcpy(host->initiator_port_id + 8, &node_guid, 8);
1530
1531 host->pd = ib_alloc_pd(device);
1532 if (IS_ERR(host->pd))
1533 goto err_free;
1534
1535 host->mr = ib_get_dma_mr(host->pd,
1536 IB_ACCESS_LOCAL_WRITE |
1537 IB_ACCESS_REMOTE_READ |
1538 IB_ACCESS_REMOTE_WRITE);
1539 if (IS_ERR(host->mr))
1540 goto err_pd;
1541
1542 host->class_dev.class = &srp_class;
1543 host->class_dev.dev = device->dma_device;
1544 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1545 device->name, port);
1546
1547 if (class_device_register(&host->class_dev))
1548 goto err_mr;
1549 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1550 goto err_class;
1551 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1552 goto err_class;
1553 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1554 goto err_class;
1555
1556 return host;
1557
1558err_class:
1559 class_device_unregister(&host->class_dev);
1560
1561err_mr:
1562 ib_dereg_mr(host->mr);
1563
1564err_pd:
1565 ib_dealloc_pd(host->pd);
1566
1567err_free:
1568 kfree(host);
1569
1570 return NULL;
1571}
1572
1573static void srp_add_one(struct ib_device *device)
1574{
1575 struct list_head *dev_list;
1576 struct srp_host *host;
1577 struct ib_device_attr *dev_attr;
1578 int s, e, p;
1579
1580 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1581 if (!dev_attr)
1582 return;
1583
1584 if (ib_query_device(device, dev_attr)) {
1585 printk(KERN_WARNING PFX "Couldn't query node GUID for %s.\n",
1586 device->name);
1587 goto out;
1588 }
1589
1590 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1591 if (!dev_list)
1592 goto out;
1593
1594 INIT_LIST_HEAD(dev_list);
1595
1596 if (device->node_type == IB_NODE_SWITCH) {
1597 s = 0;
1598 e = 0;
1599 } else {
1600 s = 1;
1601 e = device->phys_port_cnt;
1602 }
1603
1604 for (p = s; p <= e; ++p) {
1605 host = srp_add_port(device, dev_attr->node_guid, p);
1606 if (host)
1607 list_add_tail(&host->list, dev_list);
1608 }
1609
1610 ib_set_client_data(device, &srp_client, dev_list);
1611
1612out:
1613 kfree(dev_attr);
1614}
1615
1616static void srp_remove_one(struct ib_device *device)
1617{
1618 struct list_head *dev_list;
1619 struct srp_host *host, *tmp_host;
1620 LIST_HEAD(target_list);
1621 struct srp_target_port *target, *tmp_target;
1622 unsigned long flags;
1623
1624 dev_list = ib_get_client_data(device, &srp_client);
1625
1626 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1627 class_device_unregister(&host->class_dev);
1628 /*
1629 * Wait for the sysfs entry to go away, so that no new
1630 * target ports can be created.
1631 */
1632 wait_for_completion(&host->released);
1633
1634 /*
1635 * Mark all target ports as removed, so we stop queueing
1636 * commands and don't try to reconnect.
1637 */
1638 down(&host->target_mutex);
1639 list_for_each_entry_safe(target, tmp_target,
1640 &host->target_list, list) {
1641 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1642 if (target->state != SRP_TARGET_REMOVED)
1643 target->state = SRP_TARGET_REMOVED;
1644 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1645 }
1646 up(&host->target_mutex);
1647
1648 /*
1649 * Wait for any reconnection tasks that may have
1650 * started before we marked our target ports as
1651 * removed, and any target port removal tasks.
1652 */
1653 flush_scheduled_work();
1654
1655 list_for_each_entry_safe(target, tmp_target,
1656 &host->target_list, list) {
1657 scsi_remove_host(target->scsi_host);
1658 srp_disconnect_target(target);
1659 ib_destroy_cm_id(target->cm_id);
1660 srp_free_target_ib(target);
1661 scsi_host_put(target->scsi_host);
1662 }
1663
1664 ib_dereg_mr(host->mr);
1665 ib_dealloc_pd(host->pd);
1666 kfree(host);
1667 }
1668
1669 kfree(dev_list);
1670}
1671
1672static int __init srp_init_module(void)
1673{
1674 int ret;
1675
1676 ret = class_register(&srp_class);
1677 if (ret) {
1678 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1679 return ret;
1680 }
1681
1682 ret = ib_register_client(&srp_client);
1683 if (ret) {
1684 printk(KERN_ERR PFX "couldn't register IB client\n");
1685 class_unregister(&srp_class);
1686 return ret;
1687 }
1688
1689 return 0;
1690}
1691
1692static void __exit srp_cleanup_module(void)
1693{
1694 ib_unregister_client(&srp_client);
1695 class_unregister(&srp_class);
1696}
1697
1698module_init(srp_init_module);
1699module_exit(srp_cleanup_module);
Linux 6.x block layer and io_uring tree(s)