Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6.git] / drivers / infiniband / ulp / srp / ib_srp.c
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
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 #include <linux/jiffies.h>
43
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
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62                    "v" DRV_VERSION " (" DRV_RELDATE ")");
63 MODULE_LICENSE("Dual BSD/GPL");
64
65 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
66 static int srp_max_iu_len;
67
68 module_param(srp_sg_tablesize, int, 0444);
69 MODULE_PARM_DESC(srp_sg_tablesize,
70                  "Max number of gather/scatter entries per I/O (default is 12)");
71
72 static int topspin_workarounds = 1;
73
74 module_param(topspin_workarounds, int, 0444);
75 MODULE_PARM_DESC(topspin_workarounds,
76                  "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
77
78 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
79
80 static void srp_add_one(struct ib_device *device);
81 static void srp_remove_one(struct ib_device *device);
82 static void srp_completion(struct ib_cq *cq, void *target_ptr);
83 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
84
85 static struct ib_client srp_client = {
86         .name   = "srp",
87         .add    = srp_add_one,
88         .remove = srp_remove_one
89 };
90
91 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
92 {
93         return (struct srp_target_port *) host->hostdata;
94 }
95
96 static const char *srp_target_info(struct Scsi_Host *host)
97 {
98         return host_to_target(host)->target_name;
99 }
100
101 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
102                                    gfp_t gfp_mask,
103                                    enum dma_data_direction direction)
104 {
105         struct srp_iu *iu;
106
107         iu = kmalloc(sizeof *iu, gfp_mask);
108         if (!iu)
109                 goto out;
110
111         iu->buf = kzalloc(size, gfp_mask);
112         if (!iu->buf)
113                 goto out_free_iu;
114
115         iu->dma = dma_map_single(host->dev->dev->dma_device,
116                                  iu->buf, size, direction);
117         if (dma_mapping_error(iu->dma))
118                 goto out_free_buf;
119
120         iu->size      = size;
121         iu->direction = direction;
122
123         return iu;
124
125 out_free_buf:
126         kfree(iu->buf);
127 out_free_iu:
128         kfree(iu);
129 out:
130         return NULL;
131 }
132
133 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
134 {
135         if (!iu)
136                 return;
137
138         dma_unmap_single(host->dev->dev->dma_device,
139                          iu->dma, iu->size, iu->direction);
140         kfree(iu->buf);
141         kfree(iu);
142 }
143
144 static void srp_qp_event(struct ib_event *event, void *context)
145 {
146         printk(KERN_ERR PFX "QP event %d\n", event->event);
147 }
148
149 static int srp_init_qp(struct srp_target_port *target,
150                        struct ib_qp *qp)
151 {
152         struct ib_qp_attr *attr;
153         int ret;
154
155         attr = kmalloc(sizeof *attr, GFP_KERNEL);
156         if (!attr)
157                 return -ENOMEM;
158
159         ret = ib_find_cached_pkey(target->srp_host->dev->dev,
160                                   target->srp_host->port,
161                                   be16_to_cpu(target->path.pkey),
162                                   &attr->pkey_index);
163         if (ret)
164                 goto out;
165
166         attr->qp_state        = IB_QPS_INIT;
167         attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
168                                     IB_ACCESS_REMOTE_WRITE);
169         attr->port_num        = target->srp_host->port;
170
171         ret = ib_modify_qp(qp, attr,
172                            IB_QP_STATE          |
173                            IB_QP_PKEY_INDEX     |
174                            IB_QP_ACCESS_FLAGS   |
175                            IB_QP_PORT);
176
177 out:
178         kfree(attr);
179         return ret;
180 }
181
182 static int srp_create_target_ib(struct srp_target_port *target)
183 {
184         struct ib_qp_init_attr *init_attr;
185         int ret;
186
187         init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
188         if (!init_attr)
189                 return -ENOMEM;
190
191         target->cq = ib_create_cq(target->srp_host->dev->dev, srp_completion,
192                                   NULL, target, SRP_CQ_SIZE);
193         if (IS_ERR(target->cq)) {
194                 ret = PTR_ERR(target->cq);
195                 goto out;
196         }
197
198         ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
199
200         init_attr->event_handler       = srp_qp_event;
201         init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
202         init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
203         init_attr->cap.max_recv_sge    = 1;
204         init_attr->cap.max_send_sge    = 1;
205         init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
206         init_attr->qp_type             = IB_QPT_RC;
207         init_attr->send_cq             = target->cq;
208         init_attr->recv_cq             = target->cq;
209
210         target->qp = ib_create_qp(target->srp_host->dev->pd, init_attr);
211         if (IS_ERR(target->qp)) {
212                 ret = PTR_ERR(target->qp);
213                 ib_destroy_cq(target->cq);
214                 goto out;
215         }
216
217         ret = srp_init_qp(target, target->qp);
218         if (ret) {
219                 ib_destroy_qp(target->qp);
220                 ib_destroy_cq(target->cq);
221                 goto out;
222         }
223
224 out:
225         kfree(init_attr);
226         return ret;
227 }
228
229 static void srp_free_target_ib(struct srp_target_port *target)
230 {
231         int i;
232
233         ib_destroy_qp(target->qp);
234         ib_destroy_cq(target->cq);
235
236         for (i = 0; i < SRP_RQ_SIZE; ++i)
237                 srp_free_iu(target->srp_host, target->rx_ring[i]);
238         for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
239                 srp_free_iu(target->srp_host, target->tx_ring[i]);
240 }
241
242 static void srp_path_rec_completion(int status,
243                                     struct ib_sa_path_rec *pathrec,
244                                     void *target_ptr)
245 {
246         struct srp_target_port *target = target_ptr;
247
248         target->status = status;
249         if (status)
250                 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
251         else
252                 target->path = *pathrec;
253         complete(&target->done);
254 }
255
256 static int srp_lookup_path(struct srp_target_port *target)
257 {
258         target->path.numb_path = 1;
259
260         init_completion(&target->done);
261
262         target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev->dev,
263                                                    target->srp_host->port,
264                                                    &target->path,
265                                                    IB_SA_PATH_REC_DGID          |
266                                                    IB_SA_PATH_REC_SGID          |
267                                                    IB_SA_PATH_REC_NUMB_PATH     |
268                                                    IB_SA_PATH_REC_PKEY,
269                                                    SRP_PATH_REC_TIMEOUT_MS,
270                                                    GFP_KERNEL,
271                                                    srp_path_rec_completion,
272                                                    target, &target->path_query);
273         if (target->path_query_id < 0)
274                 return target->path_query_id;
275
276         wait_for_completion(&target->done);
277
278         if (target->status < 0)
279                 printk(KERN_WARNING PFX "Path record query failed\n");
280
281         return target->status;
282 }
283
284 static int srp_send_req(struct srp_target_port *target)
285 {
286         struct {
287                 struct ib_cm_req_param param;
288                 struct srp_login_req   priv;
289         } *req = NULL;
290         int status;
291
292         req = kzalloc(sizeof *req, GFP_KERNEL);
293         if (!req)
294                 return -ENOMEM;
295
296         req->param.primary_path               = &target->path;
297         req->param.alternate_path             = NULL;
298         req->param.service_id                 = target->service_id;
299         req->param.qp_num                     = target->qp->qp_num;
300         req->param.qp_type                    = target->qp->qp_type;
301         req->param.private_data               = &req->priv;
302         req->param.private_data_len           = sizeof req->priv;
303         req->param.flow_control               = 1;
304
305         get_random_bytes(&req->param.starting_psn, 4);
306         req->param.starting_psn              &= 0xffffff;
307
308         /*
309          * Pick some arbitrary defaults here; we could make these
310          * module parameters if anyone cared about setting them.
311          */
312         req->param.responder_resources        = 4;
313         req->param.remote_cm_response_timeout = 20;
314         req->param.local_cm_response_timeout  = 20;
315         req->param.retry_count                = 7;
316         req->param.rnr_retry_count            = 7;
317         req->param.max_cm_retries             = 15;
318
319         req->priv.opcode        = SRP_LOGIN_REQ;
320         req->priv.tag           = 0;
321         req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
322         req->priv.req_buf_fmt   = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
323                                               SRP_BUF_FORMAT_INDIRECT);
324         /*
325          * In the published SRP specification (draft rev. 16a), the 
326          * port identifier format is 8 bytes of ID extension followed
327          * by 8 bytes of GUID.  Older drafts put the two halves in the
328          * opposite order, so that the GUID comes first.
329          *
330          * Targets conforming to these obsolete drafts can be
331          * recognized by the I/O Class they report.
332          */
333         if (target->io_class == SRP_REV10_IB_IO_CLASS) {
334                 memcpy(req->priv.initiator_port_id,
335                        target->srp_host->initiator_port_id + 8, 8);
336                 memcpy(req->priv.initiator_port_id + 8,
337                        target->srp_host->initiator_port_id, 8);
338                 memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
339                 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
340         } else {
341                 memcpy(req->priv.initiator_port_id,
342                        target->srp_host->initiator_port_id, 16);
343                 memcpy(req->priv.target_port_id,     &target->id_ext, 8);
344                 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
345         }
346
347         /*
348          * Topspin/Cisco SRP targets will reject our login unless we
349          * zero out the first 8 bytes of our initiator port ID.  The
350          * second 8 bytes must be our local node GUID, but we always
351          * use that anyway.
352          */
353         if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
354                 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
355                        "activated for target GUID %016llx\n",
356                        (unsigned long long) be64_to_cpu(target->ioc_guid));
357                 memset(req->priv.initiator_port_id, 0, 8);
358         }
359
360         status = ib_send_cm_req(target->cm_id, &req->param);
361
362         kfree(req);
363
364         return status;
365 }
366
367 static void srp_disconnect_target(struct srp_target_port *target)
368 {
369         /* XXX should send SRP_I_LOGOUT request */
370
371         init_completion(&target->done);
372         if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
373                 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
374                 return;
375         }
376         wait_for_completion(&target->done);
377 }
378
379 static void srp_remove_work(void *target_ptr)
380 {
381         struct srp_target_port *target = target_ptr;
382
383         spin_lock_irq(target->scsi_host->host_lock);
384         if (target->state != SRP_TARGET_DEAD) {
385                 spin_unlock_irq(target->scsi_host->host_lock);
386                 return;
387         }
388         target->state = SRP_TARGET_REMOVED;
389         spin_unlock_irq(target->scsi_host->host_lock);
390
391         spin_lock(&target->srp_host->target_lock);
392         list_del(&target->list);
393         spin_unlock(&target->srp_host->target_lock);
394
395         scsi_remove_host(target->scsi_host);
396         ib_destroy_cm_id(target->cm_id);
397         srp_free_target_ib(target);
398         scsi_host_put(target->scsi_host);
399 }
400
401 static int srp_connect_target(struct srp_target_port *target)
402 {
403         int ret;
404
405         ret = srp_lookup_path(target);
406         if (ret)
407                 return ret;
408
409         while (1) {
410                 init_completion(&target->done);
411                 ret = srp_send_req(target);
412                 if (ret)
413                         return ret;
414                 wait_for_completion(&target->done);
415
416                 /*
417                  * The CM event handling code will set status to
418                  * SRP_PORT_REDIRECT if we get a port redirect REJ
419                  * back, or SRP_DLID_REDIRECT if we get a lid/qp
420                  * redirect REJ back.
421                  */
422                 switch (target->status) {
423                 case 0:
424                         return 0;
425
426                 case SRP_PORT_REDIRECT:
427                         ret = srp_lookup_path(target);
428                         if (ret)
429                                 return ret;
430                         break;
431
432                 case SRP_DLID_REDIRECT:
433                         break;
434
435                 default:
436                         return target->status;
437                 }
438         }
439 }
440
441 static void srp_unmap_data(struct scsi_cmnd *scmnd,
442                            struct srp_target_port *target,
443                            struct srp_request *req)
444 {
445         struct scatterlist *scat;
446         int nents;
447
448         if (!scmnd->request_buffer ||
449             (scmnd->sc_data_direction != DMA_TO_DEVICE &&
450              scmnd->sc_data_direction != DMA_FROM_DEVICE))
451                 return;
452
453         if (req->fmr) {
454                 ib_fmr_pool_unmap(req->fmr);
455                 req->fmr = NULL;
456         }
457
458         /*
459          * This handling of non-SG commands can be killed when the
460          * SCSI midlayer no longer generates non-SG commands.
461          */
462         if (likely(scmnd->use_sg)) {
463                 nents = scmnd->use_sg;
464                 scat  = scmnd->request_buffer;
465         } else {
466                 nents = 1;
467                 scat  = &req->fake_sg;
468         }
469
470         dma_unmap_sg(target->srp_host->dev->dev->dma_device, scat, nents,
471                      scmnd->sc_data_direction);
472 }
473
474 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
475 {
476         srp_unmap_data(req->scmnd, target, req);
477         list_move_tail(&req->list, &target->free_reqs);
478 }
479
480 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
481 {
482         req->scmnd->result = DID_RESET << 16;
483         req->scmnd->scsi_done(req->scmnd);
484         srp_remove_req(target, req);
485 }
486
487 static int srp_reconnect_target(struct srp_target_port *target)
488 {
489         struct ib_cm_id *new_cm_id;
490         struct ib_qp_attr qp_attr;
491         struct srp_request *req, *tmp;
492         struct ib_wc wc;
493         int ret;
494
495         spin_lock_irq(target->scsi_host->host_lock);
496         if (target->state != SRP_TARGET_LIVE) {
497                 spin_unlock_irq(target->scsi_host->host_lock);
498                 return -EAGAIN;
499         }
500         target->state = SRP_TARGET_CONNECTING;
501         spin_unlock_irq(target->scsi_host->host_lock);
502
503         srp_disconnect_target(target);
504         /*
505          * Now get a new local CM ID so that we avoid confusing the
506          * target in case things are really fouled up.
507          */
508         new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
509                                     srp_cm_handler, target);
510         if (IS_ERR(new_cm_id)) {
511                 ret = PTR_ERR(new_cm_id);
512                 goto err;
513         }
514         ib_destroy_cm_id(target->cm_id);
515         target->cm_id = new_cm_id;
516
517         qp_attr.qp_state = IB_QPS_RESET;
518         ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
519         if (ret)
520                 goto err;
521
522         ret = srp_init_qp(target, target->qp);
523         if (ret)
524                 goto err;
525
526         while (ib_poll_cq(target->cq, 1, &wc) > 0)
527                 ; /* nothing */
528
529         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
530                 srp_reset_req(target, req);
531
532         target->rx_head  = 0;
533         target->tx_head  = 0;
534         target->tx_tail  = 0;
535
536         ret = srp_connect_target(target);
537         if (ret)
538                 goto err;
539
540         spin_lock_irq(target->scsi_host->host_lock);
541         if (target->state == SRP_TARGET_CONNECTING) {
542                 ret = 0;
543                 target->state = SRP_TARGET_LIVE;
544         } else
545                 ret = -EAGAIN;
546         spin_unlock_irq(target->scsi_host->host_lock);
547
548         return ret;
549
550 err:
551         printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
552
553         /*
554          * We couldn't reconnect, so kill our target port off.
555          * However, we have to defer the real removal because we might
556          * be in the context of the SCSI error handler now, which
557          * would deadlock if we call scsi_remove_host().
558          */
559         spin_lock_irq(target->scsi_host->host_lock);
560         if (target->state == SRP_TARGET_CONNECTING) {
561                 target->state = SRP_TARGET_DEAD;
562                 INIT_WORK(&target->work, srp_remove_work, target);
563                 schedule_work(&target->work);
564         }
565         spin_unlock_irq(target->scsi_host->host_lock);
566
567         return ret;
568 }
569
570 static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat,
571                        int sg_cnt, struct srp_request *req,
572                        struct srp_direct_buf *buf)
573 {
574         u64 io_addr = 0;
575         u64 *dma_pages;
576         u32 len;
577         int page_cnt;
578         int i, j;
579         int ret;
580
581         if (!dev->fmr_pool)
582                 return -ENODEV;
583
584         len = page_cnt = 0;
585         for (i = 0; i < sg_cnt; ++i) {
586                 if (sg_dma_address(&scat[i]) & ~dev->fmr_page_mask) {
587                         if (i > 0)
588                                 return -EINVAL;
589                         else
590                                 ++page_cnt;
591                 }
592                 if ((sg_dma_address(&scat[i]) + sg_dma_len(&scat[i])) &
593                     ~dev->fmr_page_mask) {
594                         if (i < sg_cnt - 1)
595                                 return -EINVAL;
596                         else
597                                 ++page_cnt;
598                 }
599
600                 len += sg_dma_len(&scat[i]);
601         }
602
603         page_cnt += len >> dev->fmr_page_shift;
604         if (page_cnt > SRP_FMR_SIZE)
605                 return -ENOMEM;
606
607         dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
608         if (!dma_pages)
609                 return -ENOMEM;
610
611         page_cnt = 0;
612         for (i = 0; i < sg_cnt; ++i)
613                 for (j = 0; j < sg_dma_len(&scat[i]); j += dev->fmr_page_size)
614                         dma_pages[page_cnt++] =
615                                 (sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
616
617         req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
618                                         dma_pages, page_cnt, &io_addr);
619         if (IS_ERR(req->fmr)) {
620                 ret = PTR_ERR(req->fmr);
621                 goto out;
622         }
623
624         buf->va  = cpu_to_be64(sg_dma_address(&scat[0]) & ~dev->fmr_page_mask);
625         buf->key = cpu_to_be32(req->fmr->fmr->rkey);
626         buf->len = cpu_to_be32(len);
627
628         ret = 0;
629
630 out:
631         kfree(dma_pages);
632
633         return ret;
634 }
635
636 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
637                         struct srp_request *req)
638 {
639         struct scatterlist *scat;
640         struct srp_cmd *cmd = req->cmd->buf;
641         int len, nents, count;
642         u8 fmt = SRP_DATA_DESC_DIRECT;
643
644         if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
645                 return sizeof (struct srp_cmd);
646
647         if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
648             scmnd->sc_data_direction != DMA_TO_DEVICE) {
649                 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
650                        scmnd->sc_data_direction);
651                 return -EINVAL;
652         }
653
654         /*
655          * This handling of non-SG commands can be killed when the
656          * SCSI midlayer no longer generates non-SG commands.
657          */
658         if (likely(scmnd->use_sg)) {
659                 nents = scmnd->use_sg;
660                 scat  = scmnd->request_buffer;
661         } else {
662                 nents = 1;
663                 scat  = &req->fake_sg;
664                 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
665         }
666
667         count = dma_map_sg(target->srp_host->dev->dev->dma_device,
668                            scat, nents, scmnd->sc_data_direction);
669
670         fmt = SRP_DATA_DESC_DIRECT;
671         len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
672
673         if (count == 1) {
674                 /*
675                  * The midlayer only generated a single gather/scatter
676                  * entry, or DMA mapping coalesced everything to a
677                  * single entry.  So a direct descriptor along with
678                  * the DMA MR suffices.
679                  */
680                 struct srp_direct_buf *buf = (void *) cmd->add_data;
681
682                 buf->va  = cpu_to_be64(sg_dma_address(scat));
683                 buf->key = cpu_to_be32(target->srp_host->dev->mr->rkey);
684                 buf->len = cpu_to_be32(sg_dma_len(scat));
685         } else if (srp_map_fmr(target->srp_host->dev, scat, count, req,
686                                (void *) cmd->add_data)) {
687                 /*
688                  * FMR mapping failed, and the scatterlist has more
689                  * than one entry.  Generate an indirect memory
690                  * descriptor.
691                  */
692                 struct srp_indirect_buf *buf = (void *) cmd->add_data;
693                 u32 datalen = 0;
694                 int i;
695
696                 fmt = SRP_DATA_DESC_INDIRECT;
697                 len = sizeof (struct srp_cmd) +
698                         sizeof (struct srp_indirect_buf) +
699                         count * sizeof (struct srp_direct_buf);
700
701                 for (i = 0; i < count; ++i) {
702                         buf->desc_list[i].va  =
703                                 cpu_to_be64(sg_dma_address(&scat[i]));
704                         buf->desc_list[i].key =
705                                 cpu_to_be32(target->srp_host->dev->mr->rkey);
706                         buf->desc_list[i].len =
707                                 cpu_to_be32(sg_dma_len(&scat[i]));
708                         datalen += sg_dma_len(&scat[i]);
709                 }
710
711                 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
712                         cmd->data_out_desc_cnt = count;
713                 else
714                         cmd->data_in_desc_cnt = count;
715
716                 buf->table_desc.va  =
717                         cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
718                 buf->table_desc.key =
719                         cpu_to_be32(target->srp_host->dev->mr->rkey);
720                 buf->table_desc.len =
721                         cpu_to_be32(count * sizeof (struct srp_direct_buf));
722
723                 buf->len = cpu_to_be32(datalen);
724         }
725
726         if (scmnd->sc_data_direction == DMA_TO_DEVICE)
727                 cmd->buf_fmt = fmt << 4;
728         else
729                 cmd->buf_fmt = fmt;
730
731         return len;
732 }
733
734 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
735 {
736         struct srp_request *req;
737         struct scsi_cmnd *scmnd;
738         unsigned long flags;
739         s32 delta;
740
741         delta = (s32) be32_to_cpu(rsp->req_lim_delta);
742
743         spin_lock_irqsave(target->scsi_host->host_lock, flags);
744
745         target->req_lim += delta;
746
747         req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
748
749         if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
750                 if (be32_to_cpu(rsp->resp_data_len) < 4)
751                         req->tsk_status = -1;
752                 else
753                         req->tsk_status = rsp->data[3];
754                 complete(&req->done);
755         } else {
756                 scmnd = req->scmnd;
757                 if (!scmnd)
758                         printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
759                                (unsigned long long) rsp->tag);
760                 scmnd->result = rsp->status;
761
762                 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
763                         memcpy(scmnd->sense_buffer, rsp->data +
764                                be32_to_cpu(rsp->resp_data_len),
765                                min_t(int, be32_to_cpu(rsp->sense_data_len),
766                                      SCSI_SENSE_BUFFERSIZE));
767                 }
768
769                 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
770                         scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
771                 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
772                         scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
773
774                 if (!req->tsk_mgmt) {
775                         scmnd->host_scribble = (void *) -1L;
776                         scmnd->scsi_done(scmnd);
777
778                         srp_remove_req(target, req);
779                 } else
780                         req->cmd_done = 1;
781         }
782
783         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
784 }
785
786 static void srp_reconnect_work(void *target_ptr)
787 {
788         struct srp_target_port *target = target_ptr;
789
790         srp_reconnect_target(target);
791 }
792
793 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
794 {
795         struct srp_iu *iu;
796         u8 opcode;
797
798         iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
799
800         dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
801                                 target->max_ti_iu_len, DMA_FROM_DEVICE);
802
803         opcode = *(u8 *) iu->buf;
804
805         if (0) {
806                 int i;
807
808                 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
809
810                 for (i = 0; i < wc->byte_len; ++i) {
811                         if (i % 8 == 0)
812                                 printk(KERN_ERR "  [%02x] ", i);
813                         printk(" %02x", ((u8 *) iu->buf)[i]);
814                         if ((i + 1) % 8 == 0)
815                                 printk("\n");
816                 }
817
818                 if (wc->byte_len % 8)
819                         printk("\n");
820         }
821
822         switch (opcode) {
823         case SRP_RSP:
824                 srp_process_rsp(target, iu->buf);
825                 break;
826
827         case SRP_T_LOGOUT:
828                 /* XXX Handle target logout */
829                 printk(KERN_WARNING PFX "Got target logout request\n");
830                 break;
831
832         default:
833                 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
834                 break;
835         }
836
837         dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
838                                    target->max_ti_iu_len, DMA_FROM_DEVICE);
839 }
840
841 static void srp_completion(struct ib_cq *cq, void *target_ptr)
842 {
843         struct srp_target_port *target = target_ptr;
844         struct ib_wc wc;
845         unsigned long flags;
846
847         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
848         while (ib_poll_cq(cq, 1, &wc) > 0) {
849                 if (wc.status) {
850                         printk(KERN_ERR PFX "failed %s status %d\n",
851                                wc.wr_id & SRP_OP_RECV ? "receive" : "send",
852                                wc.status);
853                         spin_lock_irqsave(target->scsi_host->host_lock, flags);
854                         if (target->state == SRP_TARGET_LIVE)
855                                 schedule_work(&target->work);
856                         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
857                         break;
858                 }
859
860                 if (wc.wr_id & SRP_OP_RECV)
861                         srp_handle_recv(target, &wc);
862                 else
863                         ++target->tx_tail;
864         }
865 }
866
867 static int __srp_post_recv(struct srp_target_port *target)
868 {
869         struct srp_iu *iu;
870         struct ib_sge list;
871         struct ib_recv_wr wr, *bad_wr;
872         unsigned int next;
873         int ret;
874
875         next     = target->rx_head & (SRP_RQ_SIZE - 1);
876         wr.wr_id = next | SRP_OP_RECV;
877         iu       = target->rx_ring[next];
878
879         list.addr   = iu->dma;
880         list.length = iu->size;
881         list.lkey   = target->srp_host->dev->mr->lkey;
882
883         wr.next     = NULL;
884         wr.sg_list  = &list;
885         wr.num_sge  = 1;
886
887         ret = ib_post_recv(target->qp, &wr, &bad_wr);
888         if (!ret)
889                 ++target->rx_head;
890
891         return ret;
892 }
893
894 static int srp_post_recv(struct srp_target_port *target)
895 {
896         unsigned long flags;
897         int ret;
898
899         spin_lock_irqsave(target->scsi_host->host_lock, flags);
900         ret = __srp_post_recv(target);
901         spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
902
903         return ret;
904 }
905
906 /*
907  * Must be called with target->scsi_host->host_lock held to protect
908  * req_lim and tx_head.  Lock cannot be dropped between call here and
909  * call to __srp_post_send().
910  */
911 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
912 {
913         if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
914                 return NULL;
915
916         if (unlikely(target->req_lim < 1))
917                 ++target->zero_req_lim;
918
919         return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
920 }
921
922 /*
923  * Must be called with target->scsi_host->host_lock held to protect
924  * req_lim and tx_head.
925  */
926 static int __srp_post_send(struct srp_target_port *target,
927                            struct srp_iu *iu, int len)
928 {
929         struct ib_sge list;
930         struct ib_send_wr wr, *bad_wr;
931         int ret = 0;
932
933         list.addr   = iu->dma;
934         list.length = len;
935         list.lkey   = target->srp_host->dev->mr->lkey;
936
937         wr.next       = NULL;
938         wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
939         wr.sg_list    = &list;
940         wr.num_sge    = 1;
941         wr.opcode     = IB_WR_SEND;
942         wr.send_flags = IB_SEND_SIGNALED;
943
944         ret = ib_post_send(target->qp, &wr, &bad_wr);
945
946         if (!ret) {
947                 ++target->tx_head;
948                 --target->req_lim;
949         }
950
951         return ret;
952 }
953
954 static int srp_queuecommand(struct scsi_cmnd *scmnd,
955                             void (*done)(struct scsi_cmnd *))
956 {
957         struct srp_target_port *target = host_to_target(scmnd->device->host);
958         struct srp_request *req;
959         struct srp_iu *iu;
960         struct srp_cmd *cmd;
961         int len;
962
963         if (target->state == SRP_TARGET_CONNECTING)
964                 goto err;
965
966         if (target->state == SRP_TARGET_DEAD ||
967             target->state == SRP_TARGET_REMOVED) {
968                 scmnd->result = DID_BAD_TARGET << 16;
969                 done(scmnd);
970                 return 0;
971         }
972
973         iu = __srp_get_tx_iu(target);
974         if (!iu)
975                 goto err;
976
977         dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
978                                 srp_max_iu_len, DMA_TO_DEVICE);
979
980         req = list_entry(target->free_reqs.next, struct srp_request, list);
981
982         scmnd->scsi_done     = done;
983         scmnd->result        = 0;
984         scmnd->host_scribble = (void *) (long) req->index;
985
986         cmd = iu->buf;
987         memset(cmd, 0, sizeof *cmd);
988
989         cmd->opcode = SRP_CMD;
990         cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
991         cmd->tag    = req->index;
992         memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
993
994         req->scmnd    = scmnd;
995         req->cmd      = iu;
996         req->cmd_done = 0;
997         req->tsk_mgmt = NULL;
998
999         len = srp_map_data(scmnd, target, req);
1000         if (len < 0) {
1001                 printk(KERN_ERR PFX "Failed to map data\n");
1002                 goto err;
1003         }
1004
1005         if (__srp_post_recv(target)) {
1006                 printk(KERN_ERR PFX "Recv failed\n");
1007                 goto err_unmap;
1008         }
1009
1010         dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
1011                                    srp_max_iu_len, DMA_TO_DEVICE);
1012
1013         if (__srp_post_send(target, iu, len)) {
1014                 printk(KERN_ERR PFX "Send failed\n");
1015                 goto err_unmap;
1016         }
1017
1018         list_move_tail(&req->list, &target->req_queue);
1019
1020         return 0;
1021
1022 err_unmap:
1023         srp_unmap_data(scmnd, target, req);
1024
1025 err:
1026         return SCSI_MLQUEUE_HOST_BUSY;
1027 }
1028
1029 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1030 {
1031         int i;
1032
1033         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1034                 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1035                                                   target->max_ti_iu_len,
1036                                                   GFP_KERNEL, DMA_FROM_DEVICE);
1037                 if (!target->rx_ring[i])
1038                         goto err;
1039         }
1040
1041         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1042                 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1043                                                   srp_max_iu_len,
1044                                                   GFP_KERNEL, DMA_TO_DEVICE);
1045                 if (!target->tx_ring[i])
1046                         goto err;
1047         }
1048
1049         return 0;
1050
1051 err:
1052         for (i = 0; i < SRP_RQ_SIZE; ++i) {
1053                 srp_free_iu(target->srp_host, target->rx_ring[i]);
1054                 target->rx_ring[i] = NULL;
1055         }
1056
1057         for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
1058                 srp_free_iu(target->srp_host, target->tx_ring[i]);
1059                 target->tx_ring[i] = NULL;
1060         }
1061
1062         return -ENOMEM;
1063 }
1064
1065 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1066                                struct ib_cm_event *event,
1067                                struct srp_target_port *target)
1068 {
1069         struct ib_class_port_info *cpi;
1070         int opcode;
1071
1072         switch (event->param.rej_rcvd.reason) {
1073         case IB_CM_REJ_PORT_CM_REDIRECT:
1074                 cpi = event->param.rej_rcvd.ari;
1075                 target->path.dlid = cpi->redirect_lid;
1076                 target->path.pkey = cpi->redirect_pkey;
1077                 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1078                 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1079
1080                 target->status = target->path.dlid ?
1081                         SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1082                 break;
1083
1084         case IB_CM_REJ_PORT_REDIRECT:
1085                 if (topspin_workarounds &&
1086                     !memcmp(&target->ioc_guid, topspin_oui, 3)) {
1087                         /*
1088                          * Topspin/Cisco SRP gateways incorrectly send
1089                          * reject reason code 25 when they mean 24
1090                          * (port redirect).
1091                          */
1092                         memcpy(target->path.dgid.raw,
1093                                event->param.rej_rcvd.ari, 16);
1094
1095                         printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1096                                (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1097                                (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1098
1099                         target->status = SRP_PORT_REDIRECT;
1100                 } else {
1101                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1102                         target->status = -ECONNRESET;
1103                 }
1104                 break;
1105
1106         case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1107                 printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1108                 target->status = -ECONNRESET;
1109                 break;
1110
1111         case IB_CM_REJ_CONSUMER_DEFINED:
1112                 opcode = *(u8 *) event->private_data;
1113                 if (opcode == SRP_LOGIN_REJ) {
1114                         struct srp_login_rej *rej = event->private_data;
1115                         u32 reason = be32_to_cpu(rej->reason);
1116
1117                         if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1118                                 printk(KERN_WARNING PFX
1119                                        "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1120                         else
1121                                 printk(KERN_WARNING PFX
1122                                        "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1123                 } else
1124                         printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1125                                " opcode 0x%02x\n", opcode);
1126                 target->status = -ECONNRESET;
1127                 break;
1128
1129         default:
1130                 printk(KERN_WARNING "  REJ reason 0x%x\n",
1131                        event->param.rej_rcvd.reason);
1132                 target->status = -ECONNRESET;
1133         }
1134 }
1135
1136 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1137 {
1138         struct srp_target_port *target = cm_id->context;
1139         struct ib_qp_attr *qp_attr = NULL;
1140         int attr_mask = 0;
1141         int comp = 0;
1142         int opcode = 0;
1143
1144         switch (event->event) {
1145         case IB_CM_REQ_ERROR:
1146                 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1147                 comp = 1;
1148                 target->status = -ECONNRESET;
1149                 break;
1150
1151         case IB_CM_REP_RECEIVED:
1152                 comp = 1;
1153                 opcode = *(u8 *) event->private_data;
1154
1155                 if (opcode == SRP_LOGIN_RSP) {
1156                         struct srp_login_rsp *rsp = event->private_data;
1157
1158                         target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1159                         target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
1160
1161                         target->scsi_host->can_queue = min(target->req_lim,
1162                                                            target->scsi_host->can_queue);
1163                 } else {
1164                         printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1165                         target->status = -ECONNRESET;
1166                         break;
1167                 }
1168
1169                 target->status = srp_alloc_iu_bufs(target);
1170                 if (target->status)
1171                         break;
1172
1173                 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1174                 if (!qp_attr) {
1175                         target->status = -ENOMEM;
1176                         break;
1177                 }
1178
1179                 qp_attr->qp_state = IB_QPS_RTR;
1180                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1181                 if (target->status)
1182                         break;
1183
1184                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1185                 if (target->status)
1186                         break;
1187
1188                 target->status = srp_post_recv(target);
1189                 if (target->status)
1190                         break;
1191
1192                 qp_attr->qp_state = IB_QPS_RTS;
1193                 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1194                 if (target->status)
1195                         break;
1196
1197                 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1198                 if (target->status)
1199                         break;
1200
1201                 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1202                 if (target->status)
1203                         break;
1204
1205                 break;
1206
1207         case IB_CM_REJ_RECEIVED:
1208                 printk(KERN_DEBUG PFX "REJ received\n");
1209                 comp = 1;
1210
1211                 srp_cm_rej_handler(cm_id, event, target);
1212                 break;
1213
1214         case IB_CM_DREQ_RECEIVED:
1215                 printk(KERN_WARNING PFX "DREQ received - connection closed\n");
1216                 if (ib_send_cm_drep(cm_id, NULL, 0))
1217                         printk(KERN_ERR PFX "Sending CM DREP failed\n");
1218                 break;
1219
1220         case IB_CM_TIMEWAIT_EXIT:
1221                 printk(KERN_ERR PFX "connection closed\n");
1222
1223                 comp = 1;
1224                 target->status = 0;
1225                 break;
1226
1227         case IB_CM_MRA_RECEIVED:
1228         case IB_CM_DREQ_ERROR:
1229         case IB_CM_DREP_RECEIVED:
1230                 break;
1231
1232         default:
1233                 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1234                 break;
1235         }
1236
1237         if (comp)
1238                 complete(&target->done);
1239
1240         kfree(qp_attr);
1241
1242         return 0;
1243 }
1244
1245 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1246                              struct srp_request *req, u8 func)
1247 {
1248         struct srp_iu *iu;
1249         struct srp_tsk_mgmt *tsk_mgmt;
1250
1251         spin_lock_irq(target->scsi_host->host_lock);
1252
1253         if (target->state == SRP_TARGET_DEAD ||
1254             target->state == SRP_TARGET_REMOVED) {
1255                 req->scmnd->result = DID_BAD_TARGET << 16;
1256                 goto out;
1257         }
1258
1259         init_completion(&req->done);
1260
1261         iu = __srp_get_tx_iu(target);
1262         if (!iu)
1263                 goto out;
1264
1265         tsk_mgmt = iu->buf;
1266         memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1267
1268         tsk_mgmt->opcode        = SRP_TSK_MGMT;
1269         tsk_mgmt->lun           = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1270         tsk_mgmt->tag           = req->index | SRP_TAG_TSK_MGMT;
1271         tsk_mgmt->tsk_mgmt_func = func;
1272         tsk_mgmt->task_tag      = req->index;
1273
1274         if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1275                 goto out;
1276
1277         req->tsk_mgmt = iu;
1278
1279         spin_unlock_irq(target->scsi_host->host_lock);
1280
1281         if (!wait_for_completion_timeout(&req->done,
1282                                          msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1283                 return -1;
1284
1285         return 0;
1286
1287 out:
1288         spin_unlock_irq(target->scsi_host->host_lock);
1289         return -1;
1290 }
1291
1292 static int srp_find_req(struct srp_target_port *target,
1293                         struct scsi_cmnd *scmnd,
1294                         struct srp_request **req)
1295 {
1296         if (scmnd->host_scribble == (void *) -1L)
1297                 return -1;
1298
1299         *req = &target->req_ring[(long) scmnd->host_scribble];
1300
1301         return 0;
1302 }
1303
1304 static int srp_abort(struct scsi_cmnd *scmnd)
1305 {
1306         struct srp_target_port *target = host_to_target(scmnd->device->host);
1307         struct srp_request *req;
1308         int ret = SUCCESS;
1309
1310         printk(KERN_ERR "SRP abort called\n");
1311
1312         if (srp_find_req(target, scmnd, &req))
1313                 return FAILED;
1314         if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1315                 return FAILED;
1316
1317         spin_lock_irq(target->scsi_host->host_lock);
1318
1319         if (req->cmd_done) {
1320                 srp_remove_req(target, req);
1321                 scmnd->scsi_done(scmnd);
1322         } else if (!req->tsk_status) {
1323                 srp_remove_req(target, req);
1324                 scmnd->result = DID_ABORT << 16;
1325         } else
1326                 ret = FAILED;
1327
1328         spin_unlock_irq(target->scsi_host->host_lock);
1329
1330         return ret;
1331 }
1332
1333 static int srp_reset_device(struct scsi_cmnd *scmnd)
1334 {
1335         struct srp_target_port *target = host_to_target(scmnd->device->host);
1336         struct srp_request *req, *tmp;
1337
1338         printk(KERN_ERR "SRP reset_device called\n");
1339
1340         if (srp_find_req(target, scmnd, &req))
1341                 return FAILED;
1342         if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1343                 return FAILED;
1344         if (req->tsk_status)
1345                 return FAILED;
1346
1347         spin_lock_irq(target->scsi_host->host_lock);
1348
1349         list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1350                 if (req->scmnd->device == scmnd->device)
1351                         srp_reset_req(target, req);
1352
1353         spin_unlock_irq(target->scsi_host->host_lock);
1354
1355         return SUCCESS;
1356 }
1357
1358 static int srp_reset_host(struct scsi_cmnd *scmnd)
1359 {
1360         struct srp_target_port *target = host_to_target(scmnd->device->host);
1361         int ret = FAILED;
1362
1363         printk(KERN_ERR PFX "SRP reset_host called\n");
1364
1365         if (!srp_reconnect_target(target))
1366                 ret = SUCCESS;
1367
1368         return ret;
1369 }
1370
1371 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1372 {
1373         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1374
1375         if (target->state == SRP_TARGET_DEAD ||
1376             target->state == SRP_TARGET_REMOVED)
1377                 return -ENODEV;
1378
1379         return sprintf(buf, "0x%016llx\n",
1380                        (unsigned long long) be64_to_cpu(target->id_ext));
1381 }
1382
1383 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1384 {
1385         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1386
1387         if (target->state == SRP_TARGET_DEAD ||
1388             target->state == SRP_TARGET_REMOVED)
1389                 return -ENODEV;
1390
1391         return sprintf(buf, "0x%016llx\n",
1392                        (unsigned long long) be64_to_cpu(target->ioc_guid));
1393 }
1394
1395 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1396 {
1397         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1398
1399         if (target->state == SRP_TARGET_DEAD ||
1400             target->state == SRP_TARGET_REMOVED)
1401                 return -ENODEV;
1402
1403         return sprintf(buf, "0x%016llx\n",
1404                        (unsigned long long) be64_to_cpu(target->service_id));
1405 }
1406
1407 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1408 {
1409         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1410
1411         if (target->state == SRP_TARGET_DEAD ||
1412             target->state == SRP_TARGET_REMOVED)
1413                 return -ENODEV;
1414
1415         return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1416 }
1417
1418 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1419 {
1420         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1421
1422         if (target->state == SRP_TARGET_DEAD ||
1423             target->state == SRP_TARGET_REMOVED)
1424                 return -ENODEV;
1425
1426         return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1427                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1428                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1429                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1430                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1431                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1432                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1433                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1434                        be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1435 }
1436
1437 static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
1438 {
1439         struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1440
1441         if (target->state == SRP_TARGET_DEAD ||
1442             target->state == SRP_TARGET_REMOVED)
1443                 return -ENODEV;
1444
1445         return sprintf(buf, "%d\n", target->zero_req_lim);
1446 }
1447
1448 static CLASS_DEVICE_ATTR(id_ext,        S_IRUGO, show_id_ext,           NULL);
1449 static CLASS_DEVICE_ATTR(ioc_guid,      S_IRUGO, show_ioc_guid,         NULL);
1450 static CLASS_DEVICE_ATTR(service_id,    S_IRUGO, show_service_id,       NULL);
1451 static CLASS_DEVICE_ATTR(pkey,          S_IRUGO, show_pkey,             NULL);
1452 static CLASS_DEVICE_ATTR(dgid,          S_IRUGO, show_dgid,             NULL);
1453 static CLASS_DEVICE_ATTR(zero_req_lim,  S_IRUGO, show_zero_req_lim,     NULL);
1454
1455 static struct class_device_attribute *srp_host_attrs[] = {
1456         &class_device_attr_id_ext,
1457         &class_device_attr_ioc_guid,
1458         &class_device_attr_service_id,
1459         &class_device_attr_pkey,
1460         &class_device_attr_dgid,
1461         &class_device_attr_zero_req_lim,
1462         NULL
1463 };
1464
1465 static struct scsi_host_template srp_template = {
1466         .module                         = THIS_MODULE,
1467         .name                           = DRV_NAME,
1468         .info                           = srp_target_info,
1469         .queuecommand                   = srp_queuecommand,
1470         .eh_abort_handler               = srp_abort,
1471         .eh_device_reset_handler        = srp_reset_device,
1472         .eh_host_reset_handler          = srp_reset_host,
1473         .can_queue                      = SRP_SQ_SIZE,
1474         .this_id                        = -1,
1475         .cmd_per_lun                    = SRP_SQ_SIZE,
1476         .use_clustering                 = ENABLE_CLUSTERING,
1477         .shost_attrs                    = srp_host_attrs
1478 };
1479
1480 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1481 {
1482         sprintf(target->target_name, "SRP.T10:%016llX",
1483                  (unsigned long long) be64_to_cpu(target->id_ext));
1484
1485         if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1486                 return -ENODEV;
1487
1488         spin_lock(&host->target_lock);
1489         list_add_tail(&target->list, &host->target_list);
1490         spin_unlock(&host->target_lock);
1491
1492         target->state = SRP_TARGET_LIVE;
1493
1494         scsi_scan_target(&target->scsi_host->shost_gendev,
1495                          0, target->scsi_id, SCAN_WILD_CARD, 0);
1496
1497         return 0;
1498 }
1499
1500 static void srp_release_class_dev(struct class_device *class_dev)
1501 {
1502         struct srp_host *host =
1503                 container_of(class_dev, struct srp_host, class_dev);
1504
1505         complete(&host->released);
1506 }
1507
1508 static struct class srp_class = {
1509         .name    = "infiniband_srp",
1510         .release = srp_release_class_dev
1511 };
1512
1513 /*
1514  * Target ports are added by writing
1515  *
1516  *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1517  *     pkey=<P_Key>,service_id=<service ID>
1518  *
1519  * to the add_target sysfs attribute.
1520  */
1521 enum {
1522         SRP_OPT_ERR             = 0,
1523         SRP_OPT_ID_EXT          = 1 << 0,
1524         SRP_OPT_IOC_GUID        = 1 << 1,
1525         SRP_OPT_DGID            = 1 << 2,
1526         SRP_OPT_PKEY            = 1 << 3,
1527         SRP_OPT_SERVICE_ID      = 1 << 4,
1528         SRP_OPT_MAX_SECT        = 1 << 5,
1529         SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1530         SRP_OPT_IO_CLASS        = 1 << 7,
1531         SRP_OPT_ALL             = (SRP_OPT_ID_EXT       |
1532                                    SRP_OPT_IOC_GUID     |
1533                                    SRP_OPT_DGID         |
1534                                    SRP_OPT_PKEY         |
1535                                    SRP_OPT_SERVICE_ID),
1536 };
1537
1538 static match_table_t srp_opt_tokens = {
1539         { SRP_OPT_ID_EXT,               "id_ext=%s"             },
1540         { SRP_OPT_IOC_GUID,             "ioc_guid=%s"           },
1541         { SRP_OPT_DGID,                 "dgid=%s"               },
1542         { SRP_OPT_PKEY,                 "pkey=%x"               },
1543         { SRP_OPT_SERVICE_ID,           "service_id=%s"         },
1544         { SRP_OPT_MAX_SECT,             "max_sect=%d"           },
1545         { SRP_OPT_MAX_CMD_PER_LUN,      "max_cmd_per_lun=%d"    },
1546         { SRP_OPT_IO_CLASS,             "io_class=%x"           },
1547         { SRP_OPT_ERR,                  NULL                    }
1548 };
1549
1550 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1551 {
1552         char *options, *sep_opt;
1553         char *p;
1554         char dgid[3];
1555         substring_t args[MAX_OPT_ARGS];
1556         int opt_mask = 0;
1557         int token;
1558         int ret = -EINVAL;
1559         int i;
1560
1561         options = kstrdup(buf, GFP_KERNEL);
1562         if (!options)
1563                 return -ENOMEM;
1564
1565         sep_opt = options;
1566         while ((p = strsep(&sep_opt, ",")) != NULL) {
1567                 if (!*p)
1568                         continue;
1569
1570                 token = match_token(p, srp_opt_tokens, args);
1571                 opt_mask |= token;
1572
1573                 switch (token) {
1574                 case SRP_OPT_ID_EXT:
1575                         p = match_strdup(args);
1576                         target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1577                         kfree(p);
1578                         break;
1579
1580                 case SRP_OPT_IOC_GUID:
1581                         p = match_strdup(args);
1582                         target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1583                         kfree(p);
1584                         break;
1585
1586                 case SRP_OPT_DGID:
1587                         p = match_strdup(args);
1588                         if (strlen(p) != 32) {
1589                                 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1590                                 kfree(p);
1591                                 goto out;
1592                         }
1593
1594                         for (i = 0; i < 16; ++i) {
1595                                 strlcpy(dgid, p + i * 2, 3);
1596                                 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1597                         }
1598                         kfree(p);
1599                         break;
1600
1601                 case SRP_OPT_PKEY:
1602                         if (match_hex(args, &token)) {
1603                                 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1604                                 goto out;
1605                         }
1606                         target->path.pkey = cpu_to_be16(token);
1607                         break;
1608
1609                 case SRP_OPT_SERVICE_ID:
1610                         p = match_strdup(args);
1611                         target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1612                         kfree(p);
1613                         break;
1614
1615                 case SRP_OPT_MAX_SECT:
1616                         if (match_int(args, &token)) {
1617                                 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1618                                 goto out;
1619                         }
1620                         target->scsi_host->max_sectors = token;
1621                         break;
1622
1623                 case SRP_OPT_MAX_CMD_PER_LUN:
1624                         if (match_int(args, &token)) {
1625                                 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1626                                 goto out;
1627                         }
1628                         target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
1629                         break;
1630
1631                 case SRP_OPT_IO_CLASS:
1632                         if (match_hex(args, &token)) {
1633                                 printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
1634                                 goto out;
1635                         }
1636                         if (token != SRP_REV10_IB_IO_CLASS &&
1637                             token != SRP_REV16A_IB_IO_CLASS) {
1638                                 printk(KERN_WARNING PFX "unknown IO class parameter value"
1639                                        " %x specified (use %x or %x).\n",
1640                                        token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1641                                 goto out;
1642                         }
1643                         target->io_class = token;
1644                         break;
1645
1646                 default:
1647                         printk(KERN_WARNING PFX "unknown parameter or missing value "
1648                                "'%s' in target creation request\n", p);
1649                         goto out;
1650                 }
1651         }
1652
1653         if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1654                 ret = 0;
1655         else
1656                 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1657                         if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1658                             !(srp_opt_tokens[i].token & opt_mask))
1659                                 printk(KERN_WARNING PFX "target creation request is "
1660                                        "missing parameter '%s'\n",
1661                                        srp_opt_tokens[i].pattern);
1662
1663 out:
1664         kfree(options);
1665         return ret;
1666 }
1667
1668 static ssize_t srp_create_target(struct class_device *class_dev,
1669                                  const char *buf, size_t count)
1670 {
1671         struct srp_host *host =
1672                 container_of(class_dev, struct srp_host, class_dev);
1673         struct Scsi_Host *target_host;
1674         struct srp_target_port *target;
1675         int ret;
1676         int i;
1677
1678         target_host = scsi_host_alloc(&srp_template,
1679                                       sizeof (struct srp_target_port));
1680         if (!target_host)
1681                 return -ENOMEM;
1682
1683         target_host->max_lun = SRP_MAX_LUN;
1684
1685         target = host_to_target(target_host);
1686         memset(target, 0, sizeof *target);
1687
1688         target->io_class   = SRP_REV16A_IB_IO_CLASS;
1689         target->scsi_host  = target_host;
1690         target->srp_host   = host;
1691
1692         INIT_WORK(&target->work, srp_reconnect_work, target);
1693
1694         INIT_LIST_HEAD(&target->free_reqs);
1695         INIT_LIST_HEAD(&target->req_queue);
1696         for (i = 0; i < SRP_SQ_SIZE; ++i) {
1697                 target->req_ring[i].index = i;
1698                 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1699         }
1700
1701         ret = srp_parse_options(buf, target);
1702         if (ret)
1703                 goto err;
1704
1705         ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1706
1707         printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1708                "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1709                (unsigned long long) be64_to_cpu(target->id_ext),
1710                (unsigned long long) be64_to_cpu(target->ioc_guid),
1711                be16_to_cpu(target->path.pkey),
1712                (unsigned long long) be64_to_cpu(target->service_id),
1713                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1714                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1715                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1716                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1717                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1718                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1719                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1720                (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1721
1722         ret = srp_create_target_ib(target);
1723         if (ret)
1724                 goto err;
1725
1726         target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1727         if (IS_ERR(target->cm_id)) {
1728                 ret = PTR_ERR(target->cm_id);
1729                 goto err_free;
1730         }
1731
1732         ret = srp_connect_target(target);
1733         if (ret) {
1734                 printk(KERN_ERR PFX "Connection failed\n");
1735                 goto err_cm_id;
1736         }
1737
1738         ret = srp_add_target(host, target);
1739         if (ret)
1740                 goto err_disconnect;
1741
1742         return count;
1743
1744 err_disconnect:
1745         srp_disconnect_target(target);
1746
1747 err_cm_id:
1748         ib_destroy_cm_id(target->cm_id);
1749
1750 err_free:
1751         srp_free_target_ib(target);
1752
1753 err:
1754         scsi_host_put(target_host);
1755
1756         return ret;
1757 }
1758
1759 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1760
1761 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1762 {
1763         struct srp_host *host =
1764                 container_of(class_dev, struct srp_host, class_dev);
1765
1766         return sprintf(buf, "%s\n", host->dev->dev->name);
1767 }
1768
1769 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1770
1771 static ssize_t show_port(struct class_device *class_dev, char *buf)
1772 {
1773         struct srp_host *host =
1774                 container_of(class_dev, struct srp_host, class_dev);
1775
1776         return sprintf(buf, "%d\n", host->port);
1777 }
1778
1779 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1780
1781 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1782 {
1783         struct srp_host *host;
1784
1785         host = kzalloc(sizeof *host, GFP_KERNEL);
1786         if (!host)
1787                 return NULL;
1788
1789         INIT_LIST_HEAD(&host->target_list);
1790         spin_lock_init(&host->target_lock);
1791         init_completion(&host->released);
1792         host->dev  = device;
1793         host->port = port;
1794
1795         host->initiator_port_id[7] = port;
1796         memcpy(host->initiator_port_id + 8, &device->dev->node_guid, 8);
1797
1798         host->class_dev.class = &srp_class;
1799         host->class_dev.dev   = device->dev->dma_device;
1800         snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1801                  device->dev->name, port);
1802
1803         if (class_device_register(&host->class_dev))
1804                 goto free_host;
1805         if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1806                 goto err_class;
1807         if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1808                 goto err_class;
1809         if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1810                 goto err_class;
1811
1812         return host;
1813
1814 err_class:
1815         class_device_unregister(&host->class_dev);
1816
1817 free_host:
1818         kfree(host);
1819
1820         return NULL;
1821 }
1822
1823 static void srp_add_one(struct ib_device *device)
1824 {
1825         struct srp_device *srp_dev;
1826         struct ib_device_attr *dev_attr;
1827         struct ib_fmr_pool_param fmr_param;
1828         struct srp_host *host;
1829         int s, e, p;
1830
1831         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1832         if (!dev_attr)
1833                 return;
1834
1835         if (ib_query_device(device, dev_attr)) {
1836                 printk(KERN_WARNING PFX "Query device failed for %s\n",
1837                        device->name);
1838                 goto free_attr;
1839         }
1840
1841         srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
1842         if (!srp_dev)
1843                 goto free_attr;
1844
1845         /*
1846          * Use the smallest page size supported by the HCA, down to a
1847          * minimum of 512 bytes (which is the smallest sector that a
1848          * SCSI command will ever carry).
1849          */
1850         srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
1851         srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
1852         srp_dev->fmr_page_mask  = ~((unsigned long) srp_dev->fmr_page_size - 1);
1853
1854         INIT_LIST_HEAD(&srp_dev->dev_list);
1855
1856         srp_dev->dev = device;
1857         srp_dev->pd  = ib_alloc_pd(device);
1858         if (IS_ERR(srp_dev->pd))
1859                 goto free_dev;
1860
1861         srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
1862                                     IB_ACCESS_LOCAL_WRITE |
1863                                     IB_ACCESS_REMOTE_READ |
1864                                     IB_ACCESS_REMOTE_WRITE);
1865         if (IS_ERR(srp_dev->mr))
1866                 goto err_pd;
1867
1868         memset(&fmr_param, 0, sizeof fmr_param);
1869         fmr_param.pool_size         = SRP_FMR_POOL_SIZE;
1870         fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
1871         fmr_param.cache             = 1;
1872         fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
1873         fmr_param.page_shift        = srp_dev->fmr_page_shift;
1874         fmr_param.access            = (IB_ACCESS_LOCAL_WRITE |
1875                                        IB_ACCESS_REMOTE_WRITE |
1876                                        IB_ACCESS_REMOTE_READ);
1877
1878         srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
1879         if (IS_ERR(srp_dev->fmr_pool))
1880                 srp_dev->fmr_pool = NULL;
1881
1882         if (device->node_type == IB_NODE_SWITCH) {
1883                 s = 0;
1884                 e = 0;
1885         } else {
1886                 s = 1;
1887                 e = device->phys_port_cnt;
1888         }
1889
1890         for (p = s; p <= e; ++p) {
1891                 host = srp_add_port(srp_dev, p);
1892                 if (host)
1893                         list_add_tail(&host->list, &srp_dev->dev_list);
1894         }
1895
1896         ib_set_client_data(device, &srp_client, srp_dev);
1897
1898         goto free_attr;
1899
1900 err_pd:
1901         ib_dealloc_pd(srp_dev->pd);
1902
1903 free_dev:
1904         kfree(srp_dev);
1905
1906 free_attr:
1907         kfree(dev_attr);
1908 }
1909
1910 static void srp_remove_one(struct ib_device *device)
1911 {
1912         struct srp_device *srp_dev;
1913         struct srp_host *host, *tmp_host;
1914         LIST_HEAD(target_list);
1915         struct srp_target_port *target, *tmp_target;
1916
1917         srp_dev = ib_get_client_data(device, &srp_client);
1918
1919         list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
1920                 class_device_unregister(&host->class_dev);
1921                 /*
1922                  * Wait for the sysfs entry to go away, so that no new
1923                  * target ports can be created.
1924                  */
1925                 wait_for_completion(&host->released);
1926
1927                 /*
1928                  * Mark all target ports as removed, so we stop queueing
1929                  * commands and don't try to reconnect.
1930                  */
1931                 spin_lock(&host->target_lock);
1932                 list_for_each_entry(target, &host->target_list, list) {
1933                         spin_lock_irq(target->scsi_host->host_lock);
1934                         target->state = SRP_TARGET_REMOVED;
1935                         spin_unlock_irq(target->scsi_host->host_lock);
1936                 }
1937                 spin_unlock(&host->target_lock);
1938
1939                 /*
1940                  * Wait for any reconnection tasks that may have
1941                  * started before we marked our target ports as
1942                  * removed, and any target port removal tasks.
1943                  */
1944                 flush_scheduled_work();
1945
1946                 list_for_each_entry_safe(target, tmp_target,
1947                                          &host->target_list, list) {
1948                         scsi_remove_host(target->scsi_host);
1949                         srp_disconnect_target(target);
1950                         ib_destroy_cm_id(target->cm_id);
1951                         srp_free_target_ib(target);
1952                         scsi_host_put(target->scsi_host);
1953                 }
1954
1955                 kfree(host);
1956         }
1957
1958         if (srp_dev->fmr_pool)
1959                 ib_destroy_fmr_pool(srp_dev->fmr_pool);
1960         ib_dereg_mr(srp_dev->mr);
1961         ib_dealloc_pd(srp_dev->pd);
1962
1963         kfree(srp_dev);
1964 }
1965
1966 static int __init srp_init_module(void)
1967 {
1968         int ret;
1969
1970         srp_template.sg_tablesize = srp_sg_tablesize;
1971         srp_max_iu_len = (sizeof (struct srp_cmd) +
1972                           sizeof (struct srp_indirect_buf) +
1973                           srp_sg_tablesize * 16);
1974
1975         ret = class_register(&srp_class);
1976         if (ret) {
1977                 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1978                 return ret;
1979         }
1980
1981         ret = ib_register_client(&srp_client);
1982         if (ret) {
1983                 printk(KERN_ERR PFX "couldn't register IB client\n");
1984                 class_unregister(&srp_class);
1985                 return ret;
1986         }
1987
1988         return 0;
1989 }
1990
1991 static void __exit srp_cleanup_module(void)
1992 {
1993         ib_unregister_client(&srp_client);
1994         class_unregister(&srp_class);
1995 }
1996
1997 module_init(srp_init_module);
1998 module_exit(srp_cleanup_module);