blob: 351d66f3250d6936a3783c6130a7458477607184 [file] [log] [blame]
Roland Dreieraef9ec32005-11-02 14:07:13 -08001/*
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
Roland Dreieraef9ec32005-11-02 14:07:13 -080035#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>
Tim Schmielaude259682006-01-08 01:02:05 -080042#include <linux/jiffies.h>
Roland Dreieraef9ec32005-11-02 14:07:13 -080043
44#include <asm/atomic.h>
45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/srp.h>
50
51#include <rdma/ib_cache.h>
52
53#include "ib_srp.h"
54
55#define DRV_NAME "ib_srp"
56#define PFX DRV_NAME ": "
57#define DRV_VERSION "0.2"
58#define DRV_RELDATE "November 1, 2005"
59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
65static int topspin_workarounds = 1;
66
67module_param(topspin_workarounds, int, 0444);
68MODULE_PARM_DESC(topspin_workarounds,
69 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
70
71static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
72
73static void srp_add_one(struct ib_device *device);
74static void srp_remove_one(struct ib_device *device);
75static void srp_completion(struct ib_cq *cq, void *target_ptr);
76static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
77
78static struct ib_client srp_client = {
79 .name = "srp",
80 .add = srp_add_one,
81 .remove = srp_remove_one
82};
83
84static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
85{
86 return (struct srp_target_port *) host->hostdata;
87}
88
89static const char *srp_target_info(struct Scsi_Host *host)
90{
91 return host_to_target(host)->target_name;
92}
93
94static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
95 gfp_t gfp_mask,
96 enum dma_data_direction direction)
97{
98 struct srp_iu *iu;
99
100 iu = kmalloc(sizeof *iu, gfp_mask);
101 if (!iu)
102 goto out;
103
104 iu->buf = kzalloc(size, gfp_mask);
105 if (!iu->buf)
106 goto out_free_iu;
107
108 iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
109 if (dma_mapping_error(iu->dma))
110 goto out_free_buf;
111
112 iu->size = size;
113 iu->direction = direction;
114
115 return iu;
116
117out_free_buf:
118 kfree(iu->buf);
119out_free_iu:
120 kfree(iu);
121out:
122 return NULL;
123}
124
125static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
126{
127 if (!iu)
128 return;
129
130 dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
131 kfree(iu->buf);
132 kfree(iu);
133}
134
135static void srp_qp_event(struct ib_event *event, void *context)
136{
137 printk(KERN_ERR PFX "QP event %d\n", event->event);
138}
139
140static int srp_init_qp(struct srp_target_port *target,
141 struct ib_qp *qp)
142{
143 struct ib_qp_attr *attr;
144 int ret;
145
146 attr = kmalloc(sizeof *attr, GFP_KERNEL);
147 if (!attr)
148 return -ENOMEM;
149
150 ret = ib_find_cached_pkey(target->srp_host->dev,
151 target->srp_host->port,
152 be16_to_cpu(target->path.pkey),
153 &attr->pkey_index);
154 if (ret)
155 goto out;
156
157 attr->qp_state = IB_QPS_INIT;
158 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
159 IB_ACCESS_REMOTE_WRITE);
160 attr->port_num = target->srp_host->port;
161
162 ret = ib_modify_qp(qp, attr,
163 IB_QP_STATE |
164 IB_QP_PKEY_INDEX |
165 IB_QP_ACCESS_FLAGS |
166 IB_QP_PORT);
167
168out:
169 kfree(attr);
170 return ret;
171}
172
173static int srp_create_target_ib(struct srp_target_port *target)
174{
175 struct ib_qp_init_attr *init_attr;
176 int ret;
177
178 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
179 if (!init_attr)
180 return -ENOMEM;
181
182 target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
183 NULL, target, SRP_CQ_SIZE);
184 if (IS_ERR(target->cq)) {
185 ret = PTR_ERR(target->cq);
186 goto out;
187 }
188
189 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
190
191 init_attr->event_handler = srp_qp_event;
192 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
193 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
194 init_attr->cap.max_recv_sge = 1;
195 init_attr->cap.max_send_sge = 1;
196 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
197 init_attr->qp_type = IB_QPT_RC;
198 init_attr->send_cq = target->cq;
199 init_attr->recv_cq = target->cq;
200
201 target->qp = ib_create_qp(target->srp_host->pd, init_attr);
202 if (IS_ERR(target->qp)) {
203 ret = PTR_ERR(target->qp);
204 ib_destroy_cq(target->cq);
205 goto out;
206 }
207
208 ret = srp_init_qp(target, target->qp);
209 if (ret) {
210 ib_destroy_qp(target->qp);
211 ib_destroy_cq(target->cq);
212 goto out;
213 }
214
215out:
216 kfree(init_attr);
217 return ret;
218}
219
220static void srp_free_target_ib(struct srp_target_port *target)
221{
222 int i;
223
224 ib_destroy_qp(target->qp);
225 ib_destroy_cq(target->cq);
226
227 for (i = 0; i < SRP_RQ_SIZE; ++i)
228 srp_free_iu(target->srp_host, target->rx_ring[i]);
229 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
230 srp_free_iu(target->srp_host, target->tx_ring[i]);
231}
232
233static void srp_path_rec_completion(int status,
234 struct ib_sa_path_rec *pathrec,
235 void *target_ptr)
236{
237 struct srp_target_port *target = target_ptr;
238
239 target->status = status;
240 if (status)
241 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
242 else
243 target->path = *pathrec;
244 complete(&target->done);
245}
246
247static int srp_lookup_path(struct srp_target_port *target)
248{
249 target->path.numb_path = 1;
250
251 init_completion(&target->done);
252
253 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
254 target->srp_host->port,
255 &target->path,
256 IB_SA_PATH_REC_DGID |
257 IB_SA_PATH_REC_SGID |
258 IB_SA_PATH_REC_NUMB_PATH |
259 IB_SA_PATH_REC_PKEY,
260 SRP_PATH_REC_TIMEOUT_MS,
261 GFP_KERNEL,
262 srp_path_rec_completion,
263 target, &target->path_query);
264 if (target->path_query_id < 0)
265 return target->path_query_id;
266
267 wait_for_completion(&target->done);
268
269 if (target->status < 0)
270 printk(KERN_WARNING PFX "Path record query failed\n");
271
272 return target->status;
273}
274
275static int srp_send_req(struct srp_target_port *target)
276{
277 struct {
278 struct ib_cm_req_param param;
279 struct srp_login_req priv;
280 } *req = NULL;
281 int status;
282
283 req = kzalloc(sizeof *req, GFP_KERNEL);
284 if (!req)
285 return -ENOMEM;
286
287 req->param.primary_path = &target->path;
288 req->param.alternate_path = NULL;
289 req->param.service_id = target->service_id;
290 req->param.qp_num = target->qp->qp_num;
291 req->param.qp_type = target->qp->qp_type;
292 req->param.private_data = &req->priv;
293 req->param.private_data_len = sizeof req->priv;
294 req->param.flow_control = 1;
295
296 get_random_bytes(&req->param.starting_psn, 4);
297 req->param.starting_psn &= 0xffffff;
298
299 /*
300 * Pick some arbitrary defaults here; we could make these
301 * module parameters if anyone cared about setting them.
302 */
303 req->param.responder_resources = 4;
304 req->param.remote_cm_response_timeout = 20;
305 req->param.local_cm_response_timeout = 20;
306 req->param.retry_count = 7;
307 req->param.rnr_retry_count = 7;
308 req->param.max_cm_retries = 15;
309
310 req->priv.opcode = SRP_LOGIN_REQ;
311 req->priv.tag = 0;
312 req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
313 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
314 SRP_BUF_FORMAT_INDIRECT);
315 memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
316 /*
317 * Topspin/Cisco SRP targets will reject our login unless we
318 * zero out the first 8 bytes of our initiator port ID. The
319 * second 8 bytes must be our local node GUID, but we always
320 * use that anyway.
321 */
322 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
323 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
324 "activated for target GUID %016llx\n",
325 (unsigned long long) be64_to_cpu(target->ioc_guid));
326 memset(req->priv.initiator_port_id, 0, 8);
327 }
328 memcpy(req->priv.target_port_id, &target->id_ext, 8);
329 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
330
331 status = ib_send_cm_req(target->cm_id, &req->param);
332
333 kfree(req);
334
335 return status;
336}
337
338static void srp_disconnect_target(struct srp_target_port *target)
339{
340 /* XXX should send SRP_I_LOGOUT request */
341
342 init_completion(&target->done);
Roland Dreiere6581052006-05-17 09:13:21 -0700343 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
344 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
345 return;
346 }
Roland Dreieraef9ec32005-11-02 14:07:13 -0800347 wait_for_completion(&target->done);
348}
349
350static void srp_remove_work(void *target_ptr)
351{
352 struct srp_target_port *target = target_ptr;
353
354 spin_lock_irq(target->scsi_host->host_lock);
355 if (target->state != SRP_TARGET_DEAD) {
356 spin_unlock_irq(target->scsi_host->host_lock);
357 scsi_host_put(target->scsi_host);
358 return;
359 }
360 target->state = SRP_TARGET_REMOVED;
361 spin_unlock_irq(target->scsi_host->host_lock);
362
Ingo Molnar8e9e5f4f2006-01-30 15:21:21 -0800363 mutex_lock(&target->srp_host->target_mutex);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800364 list_del(&target->list);
Ingo Molnar8e9e5f4f2006-01-30 15:21:21 -0800365 mutex_unlock(&target->srp_host->target_mutex);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800366
367 scsi_remove_host(target->scsi_host);
368 ib_destroy_cm_id(target->cm_id);
369 srp_free_target_ib(target);
370 scsi_host_put(target->scsi_host);
371 /* And another put to really free the target port... */
372 scsi_host_put(target->scsi_host);
373}
374
375static int srp_connect_target(struct srp_target_port *target)
376{
377 int ret;
378
379 ret = srp_lookup_path(target);
380 if (ret)
381 return ret;
382
383 while (1) {
384 init_completion(&target->done);
385 ret = srp_send_req(target);
386 if (ret)
387 return ret;
388 wait_for_completion(&target->done);
389
390 /*
391 * The CM event handling code will set status to
392 * SRP_PORT_REDIRECT if we get a port redirect REJ
393 * back, or SRP_DLID_REDIRECT if we get a lid/qp
394 * redirect REJ back.
395 */
396 switch (target->status) {
397 case 0:
398 return 0;
399
400 case SRP_PORT_REDIRECT:
401 ret = srp_lookup_path(target);
402 if (ret)
403 return ret;
404 break;
405
406 case SRP_DLID_REDIRECT:
407 break;
408
409 default:
410 return target->status;
411 }
412 }
413}
414
Roland Dreierd945e1d2006-05-09 10:50:28 -0700415static void srp_unmap_data(struct scsi_cmnd *scmnd,
416 struct srp_target_port *target,
417 struct srp_request *req)
418{
419 struct scatterlist *scat;
420 int nents;
421
422 if (!scmnd->request_buffer ||
423 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
424 scmnd->sc_data_direction != DMA_FROM_DEVICE))
425 return;
426
427 /*
428 * This handling of non-SG commands can be killed when the
429 * SCSI midlayer no longer generates non-SG commands.
430 */
431 if (likely(scmnd->use_sg)) {
432 nents = scmnd->use_sg;
433 scat = scmnd->request_buffer;
434 } else {
435 nents = 1;
436 scat = &req->fake_sg;
437 }
438
439 dma_unmap_sg(target->srp_host->dev->dma_device, scat, nents,
440 scmnd->sc_data_direction);
441}
442
Roland Dreieraef9ec32005-11-02 14:07:13 -0800443static int srp_reconnect_target(struct srp_target_port *target)
444{
445 struct ib_cm_id *new_cm_id;
446 struct ib_qp_attr qp_attr;
447 struct srp_request *req;
448 struct ib_wc wc;
449 int ret;
450 int i;
451
452 spin_lock_irq(target->scsi_host->host_lock);
453 if (target->state != SRP_TARGET_LIVE) {
454 spin_unlock_irq(target->scsi_host->host_lock);
455 return -EAGAIN;
456 }
457 target->state = SRP_TARGET_CONNECTING;
458 spin_unlock_irq(target->scsi_host->host_lock);
459
460 srp_disconnect_target(target);
461 /*
462 * Now get a new local CM ID so that we avoid confusing the
463 * target in case things are really fouled up.
464 */
465 new_cm_id = ib_create_cm_id(target->srp_host->dev,
466 srp_cm_handler, target);
467 if (IS_ERR(new_cm_id)) {
468 ret = PTR_ERR(new_cm_id);
469 goto err;
470 }
471 ib_destroy_cm_id(target->cm_id);
472 target->cm_id = new_cm_id;
473
474 qp_attr.qp_state = IB_QPS_RESET;
475 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
476 if (ret)
477 goto err;
478
479 ret = srp_init_qp(target, target->qp);
480 if (ret)
481 goto err;
482
483 while (ib_poll_cq(target->cq, 1, &wc) > 0)
484 ; /* nothing */
485
486 list_for_each_entry(req, &target->req_queue, list) {
487 req->scmnd->result = DID_RESET << 16;
488 req->scmnd->scsi_done(req->scmnd);
Roland Dreierd945e1d2006-05-09 10:50:28 -0700489 srp_unmap_data(req->scmnd, target, req);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800490 }
491
492 target->rx_head = 0;
493 target->tx_head = 0;
494 target->tx_tail = 0;
Roland Dreierd945e1d2006-05-09 10:50:28 -0700495 INIT_LIST_HEAD(&target->free_reqs);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800496 INIT_LIST_HEAD(&target->req_queue);
Roland Dreierd945e1d2006-05-09 10:50:28 -0700497 for (i = 0; i < SRP_SQ_SIZE; ++i)
498 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800499
500 ret = srp_connect_target(target);
501 if (ret)
502 goto err;
503
504 spin_lock_irq(target->scsi_host->host_lock);
505 if (target->state == SRP_TARGET_CONNECTING) {
506 ret = 0;
507 target->state = SRP_TARGET_LIVE;
508 } else
509 ret = -EAGAIN;
510 spin_unlock_irq(target->scsi_host->host_lock);
511
512 return ret;
513
514err:
515 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
516
517 /*
518 * We couldn't reconnect, so kill our target port off.
519 * However, we have to defer the real removal because we might
520 * be in the context of the SCSI error handler now, which
521 * would deadlock if we call scsi_remove_host().
522 */
523 spin_lock_irq(target->scsi_host->host_lock);
524 if (target->state == SRP_TARGET_CONNECTING) {
525 target->state = SRP_TARGET_DEAD;
526 INIT_WORK(&target->work, srp_remove_work, target);
527 schedule_work(&target->work);
528 }
529 spin_unlock_irq(target->scsi_host->host_lock);
530
531 return ret;
532}
533
534static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
535 struct srp_request *req)
536{
Roland Dreiercf368712006-03-24 15:47:26 -0800537 struct scatterlist *scat;
Roland Dreieraef9ec32005-11-02 14:07:13 -0800538 struct srp_cmd *cmd = req->cmd->buf;
Roland Dreiercf368712006-03-24 15:47:26 -0800539 int len, nents, count;
540 int i;
Roland Dreieraef9ec32005-11-02 14:07:13 -0800541 u8 fmt;
542
543 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
544 return sizeof (struct srp_cmd);
545
546 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
547 scmnd->sc_data_direction != DMA_TO_DEVICE) {
548 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
549 scmnd->sc_data_direction);
550 return -EINVAL;
551 }
552
Roland Dreiercf368712006-03-24 15:47:26 -0800553 /*
554 * This handling of non-SG commands can be killed when the
555 * SCSI midlayer no longer generates non-SG commands.
556 */
557 if (likely(scmnd->use_sg)) {
558 nents = scmnd->use_sg;
559 scat = scmnd->request_buffer;
Roland Dreieraef9ec32005-11-02 14:07:13 -0800560 } else {
Roland Dreiercf368712006-03-24 15:47:26 -0800561 nents = 1;
562 scat = &req->fake_sg;
563 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
564 }
565
566 count = dma_map_sg(target->srp_host->dev->dma_device, scat, nents,
567 scmnd->sc_data_direction);
568
569 if (count == 1) {
Roland Dreieraef9ec32005-11-02 14:07:13 -0800570 struct srp_direct_buf *buf = (void *) cmd->add_data;
Roland Dreieraef9ec32005-11-02 14:07:13 -0800571
572 fmt = SRP_DATA_DESC_DIRECT;
573
Roland Dreiercf368712006-03-24 15:47:26 -0800574 buf->va = cpu_to_be64(sg_dma_address(scat));
575 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
576 buf->len = cpu_to_be32(sg_dma_len(scat));
577
578 len = sizeof (struct srp_cmd) +
579 sizeof (struct srp_direct_buf);
580 } else {
581 struct srp_indirect_buf *buf = (void *) cmd->add_data;
582 u32 datalen = 0;
583
584 fmt = SRP_DATA_DESC_INDIRECT;
585
586 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
587 cmd->data_out_desc_cnt = count;
588 else
589 cmd->data_in_desc_cnt = count;
590
591 buf->table_desc.va = cpu_to_be64(req->cmd->dma +
592 sizeof *cmd +
593 sizeof *buf);
594 buf->table_desc.key =
595 cpu_to_be32(target->srp_host->mr->rkey);
596 buf->table_desc.len =
597 cpu_to_be32(count * sizeof (struct srp_direct_buf));
598
599 for (i = 0; i < count; ++i) {
600 buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
601 buf->desc_list[i].key =
602 cpu_to_be32(target->srp_host->mr->rkey);
603 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
604
605 datalen += sg_dma_len(&scat[i]);
606 }
607
608 buf->len = cpu_to_be32(datalen);
609
610 len = sizeof (struct srp_cmd) +
611 sizeof (struct srp_indirect_buf) +
612 count * sizeof (struct srp_direct_buf);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800613 }
614
615 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
616 cmd->buf_fmt = fmt << 4;
617 else
618 cmd->buf_fmt = fmt;
619
Roland Dreieraef9ec32005-11-02 14:07:13 -0800620 return len;
621}
622
Roland Dreierd945e1d2006-05-09 10:50:28 -0700623static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
Roland Dreieraef9ec32005-11-02 14:07:13 -0800624{
Roland Dreierd945e1d2006-05-09 10:50:28 -0700625 srp_unmap_data(req->scmnd, target, req);
626 list_move_tail(&req->list, &target->free_reqs);
Roland Dreierf80887d2006-04-19 11:40:10 -0700627}
628
Roland Dreieraef9ec32005-11-02 14:07:13 -0800629static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
630{
631 struct srp_request *req;
632 struct scsi_cmnd *scmnd;
633 unsigned long flags;
634 s32 delta;
635
636 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
637
638 spin_lock_irqsave(target->scsi_host->host_lock, flags);
639
640 target->req_lim += delta;
641
642 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
643
644 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
645 if (be32_to_cpu(rsp->resp_data_len) < 4)
646 req->tsk_status = -1;
647 else
648 req->tsk_status = rsp->data[3];
649 complete(&req->done);
650 } else {
Roland Dreierd945e1d2006-05-09 10:50:28 -0700651 scmnd = req->scmnd;
Roland Dreieraef9ec32005-11-02 14:07:13 -0800652 if (!scmnd)
653 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
654 (unsigned long long) rsp->tag);
655 scmnd->result = rsp->status;
656
657 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
658 memcpy(scmnd->sense_buffer, rsp->data +
659 be32_to_cpu(rsp->resp_data_len),
660 min_t(int, be32_to_cpu(rsp->sense_data_len),
661 SCSI_SENSE_BUFFERSIZE));
662 }
663
664 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
665 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
666 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
667 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
668
Roland Dreieraef9ec32005-11-02 14:07:13 -0800669 if (!req->tsk_mgmt) {
Roland Dreieraef9ec32005-11-02 14:07:13 -0800670 scmnd->host_scribble = (void *) -1L;
671 scmnd->scsi_done(scmnd);
672
Roland Dreierd945e1d2006-05-09 10:50:28 -0700673 srp_remove_req(target, req);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800674 } else
675 req->cmd_done = 1;
676 }
677
678 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
679}
680
681static void srp_reconnect_work(void *target_ptr)
682{
683 struct srp_target_port *target = target_ptr;
684
685 srp_reconnect_target(target);
686}
687
688static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
689{
690 struct srp_iu *iu;
691 u8 opcode;
692
693 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
694
695 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
696 target->max_ti_iu_len, DMA_FROM_DEVICE);
697
698 opcode = *(u8 *) iu->buf;
699
700 if (0) {
701 int i;
702
703 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
704
705 for (i = 0; i < wc->byte_len; ++i) {
706 if (i % 8 == 0)
707 printk(KERN_ERR " [%02x] ", i);
708 printk(" %02x", ((u8 *) iu->buf)[i]);
709 if ((i + 1) % 8 == 0)
710 printk("\n");
711 }
712
713 if (wc->byte_len % 8)
714 printk("\n");
715 }
716
717 switch (opcode) {
718 case SRP_RSP:
719 srp_process_rsp(target, iu->buf);
720 break;
721
722 case SRP_T_LOGOUT:
723 /* XXX Handle target logout */
724 printk(KERN_WARNING PFX "Got target logout request\n");
725 break;
726
727 default:
728 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
729 break;
730 }
731
732 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
733 target->max_ti_iu_len, DMA_FROM_DEVICE);
734}
735
736static void srp_completion(struct ib_cq *cq, void *target_ptr)
737{
738 struct srp_target_port *target = target_ptr;
739 struct ib_wc wc;
740 unsigned long flags;
741
742 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
743 while (ib_poll_cq(cq, 1, &wc) > 0) {
744 if (wc.status) {
745 printk(KERN_ERR PFX "failed %s status %d\n",
746 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
747 wc.status);
748 spin_lock_irqsave(target->scsi_host->host_lock, flags);
749 if (target->state == SRP_TARGET_LIVE)
750 schedule_work(&target->work);
751 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
752 break;
753 }
754
755 if (wc.wr_id & SRP_OP_RECV)
756 srp_handle_recv(target, &wc);
757 else
758 ++target->tx_tail;
759 }
760}
761
762static int __srp_post_recv(struct srp_target_port *target)
763{
764 struct srp_iu *iu;
765 struct ib_sge list;
766 struct ib_recv_wr wr, *bad_wr;
767 unsigned int next;
768 int ret;
769
770 next = target->rx_head & (SRP_RQ_SIZE - 1);
771 wr.wr_id = next | SRP_OP_RECV;
772 iu = target->rx_ring[next];
773
774 list.addr = iu->dma;
775 list.length = iu->size;
776 list.lkey = target->srp_host->mr->lkey;
777
778 wr.next = NULL;
779 wr.sg_list = &list;
780 wr.num_sge = 1;
781
782 ret = ib_post_recv(target->qp, &wr, &bad_wr);
783 if (!ret)
784 ++target->rx_head;
785
786 return ret;
787}
788
789static int srp_post_recv(struct srp_target_port *target)
790{
791 unsigned long flags;
792 int ret;
793
794 spin_lock_irqsave(target->scsi_host->host_lock, flags);
795 ret = __srp_post_recv(target);
796 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
797
798 return ret;
799}
800
801/*
802 * Must be called with target->scsi_host->host_lock held to protect
Roland Dreier47f2bce2005-11-15 00:19:21 -0800803 * req_lim and tx_head. Lock cannot be dropped between call here and
804 * call to __srp_post_send().
Roland Dreieraef9ec32005-11-02 14:07:13 -0800805 */
806static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
807{
808 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
809 return NULL;
810
Roland Dreier47f2bce2005-11-15 00:19:21 -0800811 if (unlikely(target->req_lim < 1)) {
812 if (printk_ratelimit())
813 printk(KERN_DEBUG PFX "Target has req_lim %d\n",
814 target->req_lim);
815 return NULL;
816 }
817
Roland Dreieraef9ec32005-11-02 14:07:13 -0800818 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
819}
820
821/*
822 * Must be called with target->scsi_host->host_lock held to protect
823 * req_lim and tx_head.
824 */
825static int __srp_post_send(struct srp_target_port *target,
826 struct srp_iu *iu, int len)
827{
828 struct ib_sge list;
829 struct ib_send_wr wr, *bad_wr;
830 int ret = 0;
831
Roland Dreieraef9ec32005-11-02 14:07:13 -0800832 list.addr = iu->dma;
833 list.length = len;
834 list.lkey = target->srp_host->mr->lkey;
835
836 wr.next = NULL;
837 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
838 wr.sg_list = &list;
839 wr.num_sge = 1;
840 wr.opcode = IB_WR_SEND;
841 wr.send_flags = IB_SEND_SIGNALED;
842
843 ret = ib_post_send(target->qp, &wr, &bad_wr);
844
845 if (!ret) {
846 ++target->tx_head;
847 --target->req_lim;
848 }
849
850 return ret;
851}
852
853static int srp_queuecommand(struct scsi_cmnd *scmnd,
854 void (*done)(struct scsi_cmnd *))
855{
856 struct srp_target_port *target = host_to_target(scmnd->device->host);
857 struct srp_request *req;
858 struct srp_iu *iu;
859 struct srp_cmd *cmd;
Roland Dreieraef9ec32005-11-02 14:07:13 -0800860 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
Roland Dreierd945e1d2006-05-09 10:50:28 -0700879 req = list_entry(target->free_reqs.next, struct srp_request, list);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800880
881 scmnd->scsi_done = done;
882 scmnd->result = 0;
Roland Dreierd945e1d2006-05-09 10:50:28 -0700883 scmnd->host_scribble = (void *) (long) req->index;
Roland Dreieraef9ec32005-11-02 14:07:13 -0800884
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);
Roland Dreierd945e1d2006-05-09 10:50:28 -0700890 cmd->tag = req->index;
Roland Dreieraef9ec32005-11-02 14:07:13 -0800891 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
892
Roland Dreieraef9ec32005-11-02 14:07:13 -0800893 req->scmnd = scmnd;
894 req->cmd = iu;
895 req->cmd_done = 0;
896 req->tsk_mgmt = NULL;
897
898 len = srp_map_data(scmnd, target, req);
899 if (len < 0) {
900 printk(KERN_ERR PFX "Failed to map data\n");
901 goto err;
902 }
903
904 if (__srp_post_recv(target)) {
905 printk(KERN_ERR PFX "Recv failed\n");
906 goto err_unmap;
907 }
908
909 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
910 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
911
912 if (__srp_post_send(target, iu, len)) {
913 printk(KERN_ERR PFX "Send failed\n");
914 goto err_unmap;
915 }
916
Roland Dreierd945e1d2006-05-09 10:50:28 -0700917 list_move_tail(&req->list, &target->req_queue);
Roland Dreieraef9ec32005-11-02 14:07:13 -0800918
919 return 0;
920
921err_unmap:
922 srp_unmap_data(scmnd, target, req);
923
924err:
925 return SCSI_MLQUEUE_HOST_BUSY;
926}
927
928static int srp_alloc_iu_bufs(struct srp_target_port *target)
929{
930 int i;
931
932 for (i = 0; i < SRP_RQ_SIZE; ++i) {
933 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
934 target->max_ti_iu_len,
935 GFP_KERNEL, DMA_FROM_DEVICE);
936 if (!target->rx_ring[i])
937 goto err;
938 }
939
940 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
941 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
942 SRP_MAX_IU_LEN,
943 GFP_KERNEL, DMA_TO_DEVICE);
944 if (!target->tx_ring[i])
945 goto err;
946 }
947
948 return 0;
949
950err:
951 for (i = 0; i < SRP_RQ_SIZE; ++i) {
952 srp_free_iu(target->srp_host, target->rx_ring[i]);
953 target->rx_ring[i] = NULL;
954 }
955
956 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
957 srp_free_iu(target->srp_host, target->tx_ring[i]);
958 target->tx_ring[i] = NULL;
959 }
960
961 return -ENOMEM;
962}
963
964static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
965 struct ib_cm_event *event,
966 struct srp_target_port *target)
967{
968 struct ib_class_port_info *cpi;
969 int opcode;
970
971 switch (event->param.rej_rcvd.reason) {
972 case IB_CM_REJ_PORT_CM_REDIRECT:
973 cpi = event->param.rej_rcvd.ari;
974 target->path.dlid = cpi->redirect_lid;
975 target->path.pkey = cpi->redirect_pkey;
976 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
977 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
978
979 target->status = target->path.dlid ?
980 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
981 break;
982
983 case IB_CM_REJ_PORT_REDIRECT:
984 if (topspin_workarounds &&
985 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
986 /*
987 * Topspin/Cisco SRP gateways incorrectly send
988 * reject reason code 25 when they mean 24
989 * (port redirect).
990 */
991 memcpy(target->path.dgid.raw,
992 event->param.rej_rcvd.ari, 16);
993
994 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
995 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
996 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
997
998 target->status = SRP_PORT_REDIRECT;
999 } else {
1000 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1001 target->status = -ECONNRESET;
1002 }
1003 break;
1004
1005 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1006 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1007 target->status = -ECONNRESET;
1008 break;
1009
1010 case IB_CM_REJ_CONSUMER_DEFINED:
1011 opcode = *(u8 *) event->private_data;
1012 if (opcode == SRP_LOGIN_REJ) {
1013 struct srp_login_rej *rej = event->private_data;
1014 u32 reason = be32_to_cpu(rej->reason);
1015
1016 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1017 printk(KERN_WARNING PFX
1018 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1019 else
1020 printk(KERN_WARNING PFX
1021 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1022 } else
1023 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1024 " opcode 0x%02x\n", opcode);
1025 target->status = -ECONNRESET;
1026 break;
1027
1028 default:
1029 printk(KERN_WARNING " REJ reason 0x%x\n",
1030 event->param.rej_rcvd.reason);
1031 target->status = -ECONNRESET;
1032 }
1033}
1034
1035static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1036{
1037 struct srp_target_port *target = cm_id->context;
1038 struct ib_qp_attr *qp_attr = NULL;
1039 int attr_mask = 0;
1040 int comp = 0;
1041 int opcode = 0;
1042
1043 switch (event->event) {
1044 case IB_CM_REQ_ERROR:
1045 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1046 comp = 1;
1047 target->status = -ECONNRESET;
1048 break;
1049
1050 case IB_CM_REP_RECEIVED:
1051 comp = 1;
1052 opcode = *(u8 *) event->private_data;
1053
1054 if (opcode == SRP_LOGIN_RSP) {
1055 struct srp_login_rsp *rsp = event->private_data;
1056
1057 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1058 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1059
1060 target->scsi_host->can_queue = min(target->req_lim,
1061 target->scsi_host->can_queue);
1062 } else {
1063 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1064 target->status = -ECONNRESET;
1065 break;
1066 }
1067
1068 target->status = srp_alloc_iu_bufs(target);
1069 if (target->status)
1070 break;
1071
1072 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1073 if (!qp_attr) {
1074 target->status = -ENOMEM;
1075 break;
1076 }
1077
1078 qp_attr->qp_state = IB_QPS_RTR;
1079 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1080 if (target->status)
1081 break;
1082
1083 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1084 if (target->status)
1085 break;
1086
1087 target->status = srp_post_recv(target);
1088 if (target->status)
1089 break;
1090
1091 qp_attr->qp_state = IB_QPS_RTS;
1092 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1093 if (target->status)
1094 break;
1095
1096 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1097 if (target->status)
1098 break;
1099
1100 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1101 if (target->status)
1102 break;
1103
1104 break;
1105
1106 case IB_CM_REJ_RECEIVED:
1107 printk(KERN_DEBUG PFX "REJ received\n");
1108 comp = 1;
1109
1110 srp_cm_rej_handler(cm_id, event, target);
1111 break;
1112
1113 case IB_CM_MRA_RECEIVED:
1114 printk(KERN_ERR PFX "MRA received\n");
1115 break;
1116
1117 case IB_CM_DREP_RECEIVED:
1118 break;
1119
1120 case IB_CM_TIMEWAIT_EXIT:
1121 printk(KERN_ERR PFX "connection closed\n");
1122
1123 comp = 1;
1124 target->status = 0;
1125 break;
1126
1127 default:
1128 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1129 break;
1130 }
1131
1132 if (comp)
1133 complete(&target->done);
1134
1135 kfree(qp_attr);
1136
1137 return 0;
1138}
1139
Roland Dreierd945e1d2006-05-09 10:50:28 -07001140static int srp_send_tsk_mgmt(struct srp_target_port *target,
1141 struct srp_request *req, u8 func)
Roland Dreieraef9ec32005-11-02 14:07:13 -08001142{
Roland Dreieraef9ec32005-11-02 14:07:13 -08001143 struct srp_iu *iu;
1144 struct srp_tsk_mgmt *tsk_mgmt;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001145
1146 spin_lock_irq(target->scsi_host->host_lock);
1147
Roland Dreier1285b3a2006-03-03 15:47:25 -08001148 if (target->state == SRP_TARGET_DEAD ||
1149 target->state == SRP_TARGET_REMOVED) {
Roland Dreierd945e1d2006-05-09 10:50:28 -07001150 req->scmnd->result = DID_BAD_TARGET << 16;
Roland Dreier1285b3a2006-03-03 15:47:25 -08001151 goto out;
1152 }
1153
Roland Dreieraef9ec32005-11-02 14:07:13 -08001154 init_completion(&req->done);
1155
1156 iu = __srp_get_tx_iu(target);
1157 if (!iu)
1158 goto out;
1159
1160 tsk_mgmt = iu->buf;
1161 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1162
1163 tsk_mgmt->opcode = SRP_TSK_MGMT;
Roland Dreierd945e1d2006-05-09 10:50:28 -07001164 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1165 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001166 tsk_mgmt->tsk_mgmt_func = func;
Roland Dreierd945e1d2006-05-09 10:50:28 -07001167 tsk_mgmt->task_tag = req->index;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001168
1169 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1170 goto out;
1171
1172 req->tsk_mgmt = iu;
1173
1174 spin_unlock_irq(target->scsi_host->host_lock);
Roland Dreierd945e1d2006-05-09 10:50:28 -07001175
Roland Dreieraef9ec32005-11-02 14:07:13 -08001176 if (!wait_for_completion_timeout(&req->done,
1177 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
Roland Dreierd945e1d2006-05-09 10:50:28 -07001178 return -1;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001179
Roland Dreierd945e1d2006-05-09 10:50:28 -07001180 return 0;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001181
1182out:
1183 spin_unlock_irq(target->scsi_host->host_lock);
Roland Dreierd945e1d2006-05-09 10:50:28 -07001184 return -1;
1185}
1186
1187static int srp_find_req(struct srp_target_port *target,
1188 struct scsi_cmnd *scmnd,
1189 struct srp_request **req)
1190{
1191 if (scmnd->host_scribble == (void *) -1L)
1192 return -1;
1193
1194 *req = &target->req_ring[(long) scmnd->host_scribble];
1195
1196 return 0;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001197}
1198
1199static int srp_abort(struct scsi_cmnd *scmnd)
1200{
Roland Dreierd945e1d2006-05-09 10:50:28 -07001201 struct srp_target_port *target = host_to_target(scmnd->device->host);
1202 struct srp_request *req;
1203 int ret = SUCCESS;
1204
Roland Dreieraef9ec32005-11-02 14:07:13 -08001205 printk(KERN_ERR "SRP abort called\n");
1206
Roland Dreierd945e1d2006-05-09 10:50:28 -07001207 if (srp_find_req(target, scmnd, &req))
1208 return FAILED;
1209 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1210 return FAILED;
1211
1212 spin_lock_irq(target->scsi_host->host_lock);
1213
1214 if (req->cmd_done) {
1215 srp_remove_req(target, req);
1216 scmnd->scsi_done(scmnd);
1217 } else if (!req->tsk_status) {
1218 srp_remove_req(target, req);
1219 scmnd->result = DID_ABORT << 16;
1220 } else
1221 ret = FAILED;
1222
1223 spin_unlock_irq(target->scsi_host->host_lock);
1224
1225 return ret;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001226}
1227
1228static int srp_reset_device(struct scsi_cmnd *scmnd)
1229{
Roland Dreierd945e1d2006-05-09 10:50:28 -07001230 struct srp_target_port *target = host_to_target(scmnd->device->host);
1231 struct srp_request *req, *tmp;
1232
Roland Dreieraef9ec32005-11-02 14:07:13 -08001233 printk(KERN_ERR "SRP reset_device called\n");
1234
Roland Dreierd945e1d2006-05-09 10:50:28 -07001235 if (srp_find_req(target, scmnd, &req))
1236 return FAILED;
1237 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1238 return FAILED;
1239 if (req->tsk_status)
1240 return FAILED;
1241
1242 spin_lock_irq(target->scsi_host->host_lock);
1243
1244 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1245 if (req->scmnd->device == scmnd->device) {
1246 req->scmnd->result = DID_RESET << 16;
1247 scmnd->scsi_done(scmnd);
1248 srp_remove_req(target, req);
1249 }
1250
1251 spin_unlock_irq(target->scsi_host->host_lock);
1252
1253 return SUCCESS;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001254}
1255
1256static int srp_reset_host(struct scsi_cmnd *scmnd)
1257{
1258 struct srp_target_port *target = host_to_target(scmnd->device->host);
1259 int ret = FAILED;
1260
1261 printk(KERN_ERR PFX "SRP reset_host called\n");
1262
1263 if (!srp_reconnect_target(target))
1264 ret = SUCCESS;
1265
1266 return ret;
1267}
1268
Roland Dreier6ecb0c82006-03-20 10:08:23 -08001269static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1270{
1271 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1272
1273 if (target->state == SRP_TARGET_DEAD ||
1274 target->state == SRP_TARGET_REMOVED)
1275 return -ENODEV;
1276
1277 return sprintf(buf, "0x%016llx\n",
1278 (unsigned long long) be64_to_cpu(target->id_ext));
1279}
1280
1281static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1282{
1283 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1284
1285 if (target->state == SRP_TARGET_DEAD ||
1286 target->state == SRP_TARGET_REMOVED)
1287 return -ENODEV;
1288
1289 return sprintf(buf, "0x%016llx\n",
1290 (unsigned long long) be64_to_cpu(target->ioc_guid));
1291}
1292
1293static ssize_t show_service_id(struct class_device *cdev, char *buf)
1294{
1295 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1296
1297 if (target->state == SRP_TARGET_DEAD ||
1298 target->state == SRP_TARGET_REMOVED)
1299 return -ENODEV;
1300
1301 return sprintf(buf, "0x%016llx\n",
1302 (unsigned long long) be64_to_cpu(target->service_id));
1303}
1304
1305static ssize_t show_pkey(struct class_device *cdev, char *buf)
1306{
1307 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1308
1309 if (target->state == SRP_TARGET_DEAD ||
1310 target->state == SRP_TARGET_REMOVED)
1311 return -ENODEV;
1312
1313 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1314}
1315
1316static ssize_t show_dgid(struct class_device *cdev, char *buf)
1317{
1318 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1319
1320 if (target->state == SRP_TARGET_DEAD ||
1321 target->state == SRP_TARGET_REMOVED)
1322 return -ENODEV;
1323
1324 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1325 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1326 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1327 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1328 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1329 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1330 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1331 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1332 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1333}
1334
1335static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1336static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1337static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1338static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1339static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1340
1341static struct class_device_attribute *srp_host_attrs[] = {
1342 &class_device_attr_id_ext,
1343 &class_device_attr_ioc_guid,
1344 &class_device_attr_service_id,
1345 &class_device_attr_pkey,
1346 &class_device_attr_dgid,
1347 NULL
1348};
1349
Roland Dreieraef9ec32005-11-02 14:07:13 -08001350static struct scsi_host_template srp_template = {
1351 .module = THIS_MODULE,
1352 .name = DRV_NAME,
1353 .info = srp_target_info,
1354 .queuecommand = srp_queuecommand,
1355 .eh_abort_handler = srp_abort,
1356 .eh_device_reset_handler = srp_reset_device,
1357 .eh_host_reset_handler = srp_reset_host,
1358 .can_queue = SRP_SQ_SIZE,
1359 .this_id = -1,
1360 .sg_tablesize = SRP_MAX_INDIRECT,
1361 .cmd_per_lun = SRP_SQ_SIZE,
Roland Dreier6ecb0c82006-03-20 10:08:23 -08001362 .use_clustering = ENABLE_CLUSTERING,
1363 .shost_attrs = srp_host_attrs
Roland Dreieraef9ec32005-11-02 14:07:13 -08001364};
1365
1366static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1367{
1368 sprintf(target->target_name, "SRP.T10:%016llX",
1369 (unsigned long long) be64_to_cpu(target->id_ext));
1370
1371 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1372 return -ENODEV;
1373
Ingo Molnar8e9e5f4f2006-01-30 15:21:21 -08001374 mutex_lock(&host->target_mutex);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001375 list_add_tail(&target->list, &host->target_list);
Ingo Molnar8e9e5f4f2006-01-30 15:21:21 -08001376 mutex_unlock(&host->target_mutex);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001377
1378 target->state = SRP_TARGET_LIVE;
1379
1380 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1381 scsi_scan_target(&target->scsi_host->shost_gendev,
1382 0, target->scsi_id, ~0, 0);
1383
1384 return 0;
1385}
1386
1387static void srp_release_class_dev(struct class_device *class_dev)
1388{
1389 struct srp_host *host =
1390 container_of(class_dev, struct srp_host, class_dev);
1391
1392 complete(&host->released);
1393}
1394
1395static struct class srp_class = {
1396 .name = "infiniband_srp",
1397 .release = srp_release_class_dev
1398};
1399
1400/*
1401 * Target ports are added by writing
1402 *
1403 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1404 * pkey=<P_Key>,service_id=<service ID>
1405 *
1406 * to the add_target sysfs attribute.
1407 */
1408enum {
1409 SRP_OPT_ERR = 0,
1410 SRP_OPT_ID_EXT = 1 << 0,
1411 SRP_OPT_IOC_GUID = 1 << 1,
1412 SRP_OPT_DGID = 1 << 2,
1413 SRP_OPT_PKEY = 1 << 3,
1414 SRP_OPT_SERVICE_ID = 1 << 4,
1415 SRP_OPT_MAX_SECT = 1 << 5,
1416 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1417 SRP_OPT_IOC_GUID |
1418 SRP_OPT_DGID |
1419 SRP_OPT_PKEY |
1420 SRP_OPT_SERVICE_ID),
1421};
1422
1423static match_table_t srp_opt_tokens = {
1424 { SRP_OPT_ID_EXT, "id_ext=%s" },
1425 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1426 { SRP_OPT_DGID, "dgid=%s" },
1427 { SRP_OPT_PKEY, "pkey=%x" },
1428 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1429 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1430 { SRP_OPT_ERR, NULL }
1431};
1432
1433static int srp_parse_options(const char *buf, struct srp_target_port *target)
1434{
1435 char *options, *sep_opt;
1436 char *p;
1437 char dgid[3];
1438 substring_t args[MAX_OPT_ARGS];
1439 int opt_mask = 0;
1440 int token;
1441 int ret = -EINVAL;
1442 int i;
1443
1444 options = kstrdup(buf, GFP_KERNEL);
1445 if (!options)
1446 return -ENOMEM;
1447
1448 sep_opt = options;
1449 while ((p = strsep(&sep_opt, ",")) != NULL) {
1450 if (!*p)
1451 continue;
1452
1453 token = match_token(p, srp_opt_tokens, args);
1454 opt_mask |= token;
1455
1456 switch (token) {
1457 case SRP_OPT_ID_EXT:
1458 p = match_strdup(args);
1459 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1460 kfree(p);
1461 break;
1462
1463 case SRP_OPT_IOC_GUID:
1464 p = match_strdup(args);
1465 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1466 kfree(p);
1467 break;
1468
1469 case SRP_OPT_DGID:
1470 p = match_strdup(args);
1471 if (strlen(p) != 32) {
1472 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
Roland Dreierce1823f2006-04-03 09:31:04 -07001473 kfree(p);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001474 goto out;
1475 }
1476
1477 for (i = 0; i < 16; ++i) {
1478 strlcpy(dgid, p + i * 2, 3);
1479 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1480 }
Roland Dreierbf17c1c2006-03-20 10:08:25 -08001481 kfree(p);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001482 break;
1483
1484 case SRP_OPT_PKEY:
1485 if (match_hex(args, &token)) {
1486 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1487 goto out;
1488 }
1489 target->path.pkey = cpu_to_be16(token);
1490 break;
1491
1492 case SRP_OPT_SERVICE_ID:
1493 p = match_strdup(args);
1494 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1495 kfree(p);
1496 break;
1497
1498 case SRP_OPT_MAX_SECT:
1499 if (match_int(args, &token)) {
1500 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1501 goto out;
1502 }
1503 target->scsi_host->max_sectors = token;
1504 break;
1505
1506 default:
1507 printk(KERN_WARNING PFX "unknown parameter or missing value "
1508 "'%s' in target creation request\n", p);
1509 goto out;
1510 }
1511 }
1512
1513 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1514 ret = 0;
1515 else
1516 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1517 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1518 !(srp_opt_tokens[i].token & opt_mask))
1519 printk(KERN_WARNING PFX "target creation request is "
1520 "missing parameter '%s'\n",
1521 srp_opt_tokens[i].pattern);
1522
1523out:
1524 kfree(options);
1525 return ret;
1526}
1527
1528static ssize_t srp_create_target(struct class_device *class_dev,
1529 const char *buf, size_t count)
1530{
1531 struct srp_host *host =
1532 container_of(class_dev, struct srp_host, class_dev);
1533 struct Scsi_Host *target_host;
1534 struct srp_target_port *target;
1535 int ret;
1536 int i;
1537
1538 target_host = scsi_host_alloc(&srp_template,
1539 sizeof (struct srp_target_port));
1540 if (!target_host)
1541 return -ENOMEM;
1542
Roland Dreier5f068992005-11-11 14:06:01 -08001543 target_host->max_lun = SRP_MAX_LUN;
1544
Roland Dreieraef9ec32005-11-02 14:07:13 -08001545 target = host_to_target(target_host);
1546 memset(target, 0, sizeof *target);
1547
1548 target->scsi_host = target_host;
1549 target->srp_host = host;
1550
1551 INIT_WORK(&target->work, srp_reconnect_work, target);
1552
Roland Dreierd945e1d2006-05-09 10:50:28 -07001553 INIT_LIST_HEAD(&target->free_reqs);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001554 INIT_LIST_HEAD(&target->req_queue);
Roland Dreierd945e1d2006-05-09 10:50:28 -07001555 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1556 target->req_ring[i].index = i;
1557 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1558 }
Roland Dreieraef9ec32005-11-02 14:07:13 -08001559
1560 ret = srp_parse_options(buf, target);
1561 if (ret)
1562 goto err;
1563
1564 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1565
1566 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1567 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1568 (unsigned long long) be64_to_cpu(target->id_ext),
1569 (unsigned long long) be64_to_cpu(target->ioc_guid),
1570 be16_to_cpu(target->path.pkey),
1571 (unsigned long long) be64_to_cpu(target->service_id),
1572 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1573 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1574 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1575 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1576 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1577 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1578 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1579 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1580
1581 ret = srp_create_target_ib(target);
1582 if (ret)
1583 goto err;
1584
1585 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1586 if (IS_ERR(target->cm_id)) {
1587 ret = PTR_ERR(target->cm_id);
1588 goto err_free;
1589 }
1590
1591 ret = srp_connect_target(target);
1592 if (ret) {
1593 printk(KERN_ERR PFX "Connection failed\n");
1594 goto err_cm_id;
1595 }
1596
1597 ret = srp_add_target(host, target);
1598 if (ret)
1599 goto err_disconnect;
1600
1601 return count;
1602
1603err_disconnect:
1604 srp_disconnect_target(target);
1605
1606err_cm_id:
1607 ib_destroy_cm_id(target->cm_id);
1608
1609err_free:
1610 srp_free_target_ib(target);
1611
1612err:
1613 scsi_host_put(target_host);
1614
1615 return ret;
1616}
1617
1618static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1619
1620static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1621{
1622 struct srp_host *host =
1623 container_of(class_dev, struct srp_host, class_dev);
1624
1625 return sprintf(buf, "%s\n", host->dev->name);
1626}
1627
1628static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1629
1630static ssize_t show_port(struct class_device *class_dev, char *buf)
1631{
1632 struct srp_host *host =
1633 container_of(class_dev, struct srp_host, class_dev);
1634
1635 return sprintf(buf, "%d\n", host->port);
1636}
1637
1638static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1639
Sean Heftycf311cd2006-01-10 07:39:34 -08001640static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
Roland Dreieraef9ec32005-11-02 14:07:13 -08001641{
1642 struct srp_host *host;
1643
1644 host = kzalloc(sizeof *host, GFP_KERNEL);
1645 if (!host)
1646 return NULL;
1647
1648 INIT_LIST_HEAD(&host->target_list);
Ingo Molnar8e9e5f4f2006-01-30 15:21:21 -08001649 mutex_init(&host->target_mutex);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001650 init_completion(&host->released);
1651 host->dev = device;
1652 host->port = port;
1653
1654 host->initiator_port_id[7] = port;
Sean Heftycf311cd2006-01-10 07:39:34 -08001655 memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001656
1657 host->pd = ib_alloc_pd(device);
1658 if (IS_ERR(host->pd))
1659 goto err_free;
1660
1661 host->mr = ib_get_dma_mr(host->pd,
1662 IB_ACCESS_LOCAL_WRITE |
1663 IB_ACCESS_REMOTE_READ |
1664 IB_ACCESS_REMOTE_WRITE);
1665 if (IS_ERR(host->mr))
1666 goto err_pd;
1667
1668 host->class_dev.class = &srp_class;
1669 host->class_dev.dev = device->dma_device;
1670 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1671 device->name, port);
1672
1673 if (class_device_register(&host->class_dev))
1674 goto err_mr;
1675 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1676 goto err_class;
1677 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1678 goto err_class;
1679 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1680 goto err_class;
1681
1682 return host;
1683
1684err_class:
1685 class_device_unregister(&host->class_dev);
1686
1687err_mr:
1688 ib_dereg_mr(host->mr);
1689
1690err_pd:
1691 ib_dealloc_pd(host->pd);
1692
1693err_free:
1694 kfree(host);
1695
1696 return NULL;
1697}
1698
1699static void srp_add_one(struct ib_device *device)
1700{
1701 struct list_head *dev_list;
1702 struct srp_host *host;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001703 int s, e, p;
1704
Roland Dreieraef9ec32005-11-02 14:07:13 -08001705 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1706 if (!dev_list)
Sean Heftycf311cd2006-01-10 07:39:34 -08001707 return;
Roland Dreieraef9ec32005-11-02 14:07:13 -08001708
1709 INIT_LIST_HEAD(dev_list);
1710
1711 if (device->node_type == IB_NODE_SWITCH) {
1712 s = 0;
1713 e = 0;
1714 } else {
1715 s = 1;
1716 e = device->phys_port_cnt;
1717 }
1718
1719 for (p = s; p <= e; ++p) {
Sean Heftycf311cd2006-01-10 07:39:34 -08001720 host = srp_add_port(device, p);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001721 if (host)
1722 list_add_tail(&host->list, dev_list);
1723 }
1724
1725 ib_set_client_data(device, &srp_client, dev_list);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001726}
1727
1728static void srp_remove_one(struct ib_device *device)
1729{
1730 struct list_head *dev_list;
1731 struct srp_host *host, *tmp_host;
1732 LIST_HEAD(target_list);
1733 struct srp_target_port *target, *tmp_target;
1734 unsigned long flags;
1735
1736 dev_list = ib_get_client_data(device, &srp_client);
1737
1738 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1739 class_device_unregister(&host->class_dev);
1740 /*
1741 * Wait for the sysfs entry to go away, so that no new
1742 * target ports can be created.
1743 */
1744 wait_for_completion(&host->released);
1745
1746 /*
1747 * Mark all target ports as removed, so we stop queueing
1748 * commands and don't try to reconnect.
1749 */
Ingo Molnar8e9e5f4f2006-01-30 15:21:21 -08001750 mutex_lock(&host->target_mutex);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001751 list_for_each_entry_safe(target, tmp_target,
1752 &host->target_list, list) {
1753 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1754 if (target->state != SRP_TARGET_REMOVED)
1755 target->state = SRP_TARGET_REMOVED;
1756 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1757 }
Ingo Molnar8e9e5f4f2006-01-30 15:21:21 -08001758 mutex_unlock(&host->target_mutex);
Roland Dreieraef9ec32005-11-02 14:07:13 -08001759
1760 /*
1761 * Wait for any reconnection tasks that may have
1762 * started before we marked our target ports as
1763 * removed, and any target port removal tasks.
1764 */
1765 flush_scheduled_work();
1766
1767 list_for_each_entry_safe(target, tmp_target,
1768 &host->target_list, list) {
1769 scsi_remove_host(target->scsi_host);
1770 srp_disconnect_target(target);
1771 ib_destroy_cm_id(target->cm_id);
1772 srp_free_target_ib(target);
1773 scsi_host_put(target->scsi_host);
1774 }
1775
1776 ib_dereg_mr(host->mr);
1777 ib_dealloc_pd(host->pd);
1778 kfree(host);
1779 }
1780
1781 kfree(dev_list);
1782}
1783
1784static int __init srp_init_module(void)
1785{
1786 int ret;
1787
1788 ret = class_register(&srp_class);
1789 if (ret) {
1790 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1791 return ret;
1792 }
1793
1794 ret = ib_register_client(&srp_client);
1795 if (ret) {
1796 printk(KERN_ERR PFX "couldn't register IB client\n");
1797 class_unregister(&srp_class);
1798 return ret;
1799 }
1800
1801 return 0;
1802}
1803
1804static void __exit srp_cleanup_module(void)
1805{
1806 ib_unregister_client(&srp_client);
1807 class_unregister(&srp_class);
1808}
1809
1810module_init(srp_init_module);
1811module_exit(srp_cleanup_module);