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authorRoland Dreier <rolandd@cisco.com>2005-11-02 17:07:13 -0500
committerRoland Dreier <rolandd@cisco.com>2005-11-02 17:07:13 -0500
commitaef9ec39c47f0cece886ddd6b53c440321e0b2a6 (patch)
treed9a0f0fb69ef336bec4317ef5f95adc8c062e445 /drivers
parent89fbb69c4f285019ba5e029963dc11cc6beb078a (diff)
IB: Add SCSI RDMA Protocol (SRP) initiator
Add an InfiniBand SCSI RDMA Protocol (SRP) initiator. This driver is used to talk talk to InfiniBand SRP targets (storage devices). Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/infiniband/Kconfig2
-rw-r--r--drivers/infiniband/Makefile1
-rw-r--r--drivers/infiniband/ulp/srp/Kbuild1
-rw-r--r--drivers/infiniband/ulp/srp/Kconfig11
-rw-r--r--drivers/infiniband/ulp/srp/ib_srp.c1700
-rw-r--r--drivers/infiniband/ulp/srp/ib_srp.h150
6 files changed, 1865 insertions, 0 deletions
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index 325d502e25cd..bdf0891a92dd 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -33,4 +33,6 @@ source "drivers/infiniband/hw/mthca/Kconfig"
33 33
34source "drivers/infiniband/ulp/ipoib/Kconfig" 34source "drivers/infiniband/ulp/ipoib/Kconfig"
35 35
36source "drivers/infiniband/ulp/srp/Kconfig"
37
36endmenu 38endmenu
diff --git a/drivers/infiniband/Makefile b/drivers/infiniband/Makefile
index d256cf798218..a43fb34cca94 100644
--- a/drivers/infiniband/Makefile
+++ b/drivers/infiniband/Makefile
@@ -1,3 +1,4 @@
1obj-$(CONFIG_INFINIBAND) += core/ 1obj-$(CONFIG_INFINIBAND) += core/
2obj-$(CONFIG_INFINIBAND_MTHCA) += hw/mthca/ 2obj-$(CONFIG_INFINIBAND_MTHCA) += hw/mthca/
3obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/ 3obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/
4obj-$(CONFIG_INFINIBAND_SRP) += ulp/srp/
diff --git a/drivers/infiniband/ulp/srp/Kbuild b/drivers/infiniband/ulp/srp/Kbuild
new file mode 100644
index 000000000000..a16c73c667cb
--- /dev/null
+++ b/drivers/infiniband/ulp/srp/Kbuild
@@ -0,0 +1 @@
obj-$(CONFIG_INFINIBAND_SRP) += ib_srp.o
diff --git a/drivers/infiniband/ulp/srp/Kconfig b/drivers/infiniband/ulp/srp/Kconfig
new file mode 100644
index 000000000000..8fe3be4e9910
--- /dev/null
+++ b/drivers/infiniband/ulp/srp/Kconfig
@@ -0,0 +1,11 @@
1config INFINIBAND_SRP
2 tristate "InfiniBand SCSI RDMA Protocol"
3 depends on INFINIBAND && SCSI
4 ---help---
5 Support for the SCSI RDMA Protocol over InfiniBand. This
6 allows you to access storage devices that speak SRP over
7 InfiniBand.
8
9 The SRP protocol is defined by the INCITS T10 technical
10 committee. See <http://www.t10.org/>.
11
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
new file mode 100644
index 000000000000..2687e34aa5bc
--- /dev/null
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -0,0 +1,1700 @@
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/version.h>
36#include <linux/module.h>
37#include <linux/init.h>
38#include <linux/slab.h>
39#include <linux/err.h>
40#include <linux/string.h>
41#include <linux/parser.h>
42#include <linux/random.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
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);
343 ib_send_cm_dreq(target->cm_id, NULL, 0);
344 wait_for_completion(&target->done);
345}
346
347static void srp_remove_work(void *target_ptr)
348{
349 struct srp_target_port *target = target_ptr;
350
351 spin_lock_irq(target->scsi_host->host_lock);
352 if (target->state != SRP_TARGET_DEAD) {
353 spin_unlock_irq(target->scsi_host->host_lock);
354 scsi_host_put(target->scsi_host);
355 return;
356 }
357 target->state = SRP_TARGET_REMOVED;
358 spin_unlock_irq(target->scsi_host->host_lock);
359
360 down(&target->srp_host->target_mutex);
361 list_del(&target->list);
362 up(&target->srp_host->target_mutex);
363
364 scsi_remove_host(target->scsi_host);
365 ib_destroy_cm_id(target->cm_id);
366 srp_free_target_ib(target);
367 scsi_host_put(target->scsi_host);
368 /* And another put to really free the target port... */
369 scsi_host_put(target->scsi_host);
370}
371
372static int srp_connect_target(struct srp_target_port *target)
373{
374 int ret;
375
376 ret = srp_lookup_path(target);
377 if (ret)
378 return ret;
379
380 while (1) {
381 init_completion(&target->done);
382 ret = srp_send_req(target);
383 if (ret)
384 return ret;
385 wait_for_completion(&target->done);
386
387 /*
388 * The CM event handling code will set status to
389 * SRP_PORT_REDIRECT if we get a port redirect REJ
390 * back, or SRP_DLID_REDIRECT if we get a lid/qp
391 * redirect REJ back.
392 */
393 switch (target->status) {
394 case 0:
395 return 0;
396
397 case SRP_PORT_REDIRECT:
398 ret = srp_lookup_path(target);
399 if (ret)
400 return ret;
401 break;
402
403 case SRP_DLID_REDIRECT:
404 break;
405
406 default:
407 return target->status;
408 }
409 }
410}
411
412static int srp_reconnect_target(struct srp_target_port *target)
413{
414 struct ib_cm_id *new_cm_id;
415 struct ib_qp_attr qp_attr;
416 struct srp_request *req;
417 struct ib_wc wc;
418 int ret;
419 int i;
420
421 spin_lock_irq(target->scsi_host->host_lock);
422 if (target->state != SRP_TARGET_LIVE) {
423 spin_unlock_irq(target->scsi_host->host_lock);
424 return -EAGAIN;
425 }
426 target->state = SRP_TARGET_CONNECTING;
427 spin_unlock_irq(target->scsi_host->host_lock);
428
429 srp_disconnect_target(target);
430 /*
431 * Now get a new local CM ID so that we avoid confusing the
432 * target in case things are really fouled up.
433 */
434 new_cm_id = ib_create_cm_id(target->srp_host->dev,
435 srp_cm_handler, target);
436 if (IS_ERR(new_cm_id)) {
437 ret = PTR_ERR(new_cm_id);
438 goto err;
439 }
440 ib_destroy_cm_id(target->cm_id);
441 target->cm_id = new_cm_id;
442
443 qp_attr.qp_state = IB_QPS_RESET;
444 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
445 if (ret)
446 goto err;
447
448 ret = srp_init_qp(target, target->qp);
449 if (ret)
450 goto err;
451
452 while (ib_poll_cq(target->cq, 1, &wc) > 0)
453 ; /* nothing */
454
455 list_for_each_entry(req, &target->req_queue, list) {
456 req->scmnd->result = DID_RESET << 16;
457 req->scmnd->scsi_done(req->scmnd);
458 }
459
460 target->rx_head = 0;
461 target->tx_head = 0;
462 target->tx_tail = 0;
463 target->req_head = 0;
464 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
465 target->req_ring[i].next = i + 1;
466 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
467 INIT_LIST_HEAD(&target->req_queue);
468
469 ret = srp_connect_target(target);
470 if (ret)
471 goto err;
472
473 spin_lock_irq(target->scsi_host->host_lock);
474 if (target->state == SRP_TARGET_CONNECTING) {
475 ret = 0;
476 target->state = SRP_TARGET_LIVE;
477 } else
478 ret = -EAGAIN;
479 spin_unlock_irq(target->scsi_host->host_lock);
480
481 return ret;
482
483err:
484 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
485
486 /*
487 * We couldn't reconnect, so kill our target port off.
488 * However, we have to defer the real removal because we might
489 * be in the context of the SCSI error handler now, which
490 * would deadlock if we call scsi_remove_host().
491 */
492 spin_lock_irq(target->scsi_host->host_lock);
493 if (target->state == SRP_TARGET_CONNECTING) {
494 target->state = SRP_TARGET_DEAD;
495 INIT_WORK(&target->work, srp_remove_work, target);
496 schedule_work(&target->work);
497 }
498 spin_unlock_irq(target->scsi_host->host_lock);
499
500 return ret;
501}
502
503static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
504 struct srp_request *req)
505{
506 struct srp_cmd *cmd = req->cmd->buf;
507 int len;
508 u8 fmt;
509
510 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
511 return sizeof (struct srp_cmd);
512
513 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
514 scmnd->sc_data_direction != DMA_TO_DEVICE) {
515 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
516 scmnd->sc_data_direction);
517 return -EINVAL;
518 }
519
520 if (scmnd->use_sg) {
521 struct scatterlist *scat = scmnd->request_buffer;
522 int n;
523 int i;
524
525 n = dma_map_sg(target->srp_host->dev->dma_device,
526 scat, scmnd->use_sg, scmnd->sc_data_direction);
527
528 if (n == 1) {
529 struct srp_direct_buf *buf = (void *) cmd->add_data;
530
531 fmt = SRP_DATA_DESC_DIRECT;
532
533 buf->va = cpu_to_be64(sg_dma_address(scat));
534 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
535 buf->len = cpu_to_be32(sg_dma_len(scat));
536
537 len = sizeof (struct srp_cmd) +
538 sizeof (struct srp_direct_buf);
539 } else {
540 struct srp_indirect_buf *buf = (void *) cmd->add_data;
541 u32 datalen = 0;
542
543 fmt = SRP_DATA_DESC_INDIRECT;
544
545 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
546 cmd->data_out_desc_cnt = n;
547 else
548 cmd->data_in_desc_cnt = n;
549
550 buf->table_desc.va = cpu_to_be64(req->cmd->dma +
551 sizeof *cmd +
552 sizeof *buf);
553 buf->table_desc.key =
554 cpu_to_be32(target->srp_host->mr->rkey);
555 buf->table_desc.len =
556 cpu_to_be32(n * sizeof (struct srp_direct_buf));
557
558 for (i = 0; i < n; ++i) {
559 buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
560 buf->desc_list[i].key =
561 cpu_to_be32(target->srp_host->mr->rkey);
562 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
563
564 datalen += sg_dma_len(&scat[i]);
565 }
566
567 buf->len = cpu_to_be32(datalen);
568
569 len = sizeof (struct srp_cmd) +
570 sizeof (struct srp_indirect_buf) +
571 n * sizeof (struct srp_direct_buf);
572 }
573 } else {
574 struct srp_direct_buf *buf = (void *) cmd->add_data;
575 dma_addr_t dma;
576
577 dma = dma_map_single(target->srp_host->dev->dma_device,
578 scmnd->request_buffer, scmnd->request_bufflen,
579 scmnd->sc_data_direction);
580 if (dma_mapping_error(dma)) {
581 printk(KERN_WARNING PFX "unable to map %p/%d (dir %d)\n",
582 scmnd->request_buffer, (int) scmnd->request_bufflen,
583 scmnd->sc_data_direction);
584 return -EINVAL;
585 }
586
587 pci_unmap_addr_set(req, direct_mapping, dma);
588
589 buf->va = cpu_to_be64(dma);
590 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
591 buf->len = cpu_to_be32(scmnd->request_bufflen);
592
593 fmt = SRP_DATA_DESC_DIRECT;
594
595 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
596 }
597
598 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
599 cmd->buf_fmt = fmt << 4;
600 else
601 cmd->buf_fmt = fmt;
602
603
604 return len;
605}
606
607static void srp_unmap_data(struct scsi_cmnd *scmnd,
608 struct srp_target_port *target,
609 struct srp_request *req)
610{
611 if (!scmnd->request_buffer ||
612 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
613 scmnd->sc_data_direction != DMA_FROM_DEVICE))
614 return;
615
616 if (scmnd->use_sg)
617 dma_unmap_sg(target->srp_host->dev->dma_device,
618 (struct scatterlist *) scmnd->request_buffer,
619 scmnd->use_sg, scmnd->sc_data_direction);
620 else
621 dma_unmap_single(target->srp_host->dev->dma_device,
622 pci_unmap_addr(req, direct_mapping),
623 scmnd->request_bufflen,
624 scmnd->sc_data_direction);
625}
626
627static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
628{
629 struct srp_request *req;
630 struct scsi_cmnd *scmnd;
631 unsigned long flags;
632 s32 delta;
633
634 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
635
636 spin_lock_irqsave(target->scsi_host->host_lock, flags);
637
638 target->req_lim += delta;
639
640 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
641
642 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
643 if (be32_to_cpu(rsp->resp_data_len) < 4)
644 req->tsk_status = -1;
645 else
646 req->tsk_status = rsp->data[3];
647 complete(&req->done);
648 } else {
649 scmnd = req->scmnd;
650 if (!scmnd)
651 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
652 (unsigned long long) rsp->tag);
653 scmnd->result = rsp->status;
654
655 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
656 memcpy(scmnd->sense_buffer, rsp->data +
657 be32_to_cpu(rsp->resp_data_len),
658 min_t(int, be32_to_cpu(rsp->sense_data_len),
659 SCSI_SENSE_BUFFERSIZE));
660 }
661
662 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
663 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
664 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
665 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
666
667 srp_unmap_data(scmnd, target, req);
668
669 if (!req->tsk_mgmt) {
670 req->scmnd = NULL;
671 scmnd->host_scribble = (void *) -1L;
672 scmnd->scsi_done(scmnd);
673
674 list_del(&req->list);
675 req->next = target->req_head;
676 target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
677 } else
678 req->cmd_done = 1;
679 }
680
681 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
682}
683
684static void srp_reconnect_work(void *target_ptr)
685{
686 struct srp_target_port *target = target_ptr;
687
688 srp_reconnect_target(target);
689}
690
691static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
692{
693 struct srp_iu *iu;
694 u8 opcode;
695
696 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
697
698 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
699 target->max_ti_iu_len, DMA_FROM_DEVICE);
700
701 opcode = *(u8 *) iu->buf;
702
703 if (0) {
704 int i;
705
706 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
707
708 for (i = 0; i < wc->byte_len; ++i) {
709 if (i % 8 == 0)
710 printk(KERN_ERR " [%02x] ", i);
711 printk(" %02x", ((u8 *) iu->buf)[i]);
712 if ((i + 1) % 8 == 0)
713 printk("\n");
714 }
715
716 if (wc->byte_len % 8)
717 printk("\n");
718 }
719
720 switch (opcode) {
721 case SRP_RSP:
722 srp_process_rsp(target, iu->buf);
723 break;
724
725 case SRP_T_LOGOUT:
726 /* XXX Handle target logout */
727 printk(KERN_WARNING PFX "Got target logout request\n");
728 break;
729
730 default:
731 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
732 break;
733 }
734
735 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
736 target->max_ti_iu_len, DMA_FROM_DEVICE);
737}
738
739static void srp_completion(struct ib_cq *cq, void *target_ptr)
740{
741 struct srp_target_port *target = target_ptr;
742 struct ib_wc wc;
743 unsigned long flags;
744
745 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
746 while (ib_poll_cq(cq, 1, &wc) > 0) {
747 if (wc.status) {
748 printk(KERN_ERR PFX "failed %s status %d\n",
749 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
750 wc.status);
751 spin_lock_irqsave(target->scsi_host->host_lock, flags);
752 if (target->state == SRP_TARGET_LIVE)
753 schedule_work(&target->work);
754 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
755 break;
756 }
757
758 if (wc.wr_id & SRP_OP_RECV)
759 srp_handle_recv(target, &wc);
760 else
761 ++target->tx_tail;
762 }
763}
764
765static int __srp_post_recv(struct srp_target_port *target)
766{
767 struct srp_iu *iu;
768 struct ib_sge list;
769 struct ib_recv_wr wr, *bad_wr;
770 unsigned int next;
771 int ret;
772
773 next = target->rx_head & (SRP_RQ_SIZE - 1);
774 wr.wr_id = next | SRP_OP_RECV;
775 iu = target->rx_ring[next];
776
777 list.addr = iu->dma;
778 list.length = iu->size;
779 list.lkey = target->srp_host->mr->lkey;
780
781 wr.next = NULL;
782 wr.sg_list = &list;
783 wr.num_sge = 1;
784
785 ret = ib_post_recv(target->qp, &wr, &bad_wr);
786 if (!ret)
787 ++target->rx_head;
788
789 return ret;
790}
791
792static int srp_post_recv(struct srp_target_port *target)
793{
794 unsigned long flags;
795 int ret;
796
797 spin_lock_irqsave(target->scsi_host->host_lock, flags);
798 ret = __srp_post_recv(target);
799 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
800
801 return ret;
802}
803
804/*
805 * Must be called with target->scsi_host->host_lock held to protect
806 * req_lim and tx_head.
807 */
808static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
809{
810 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
811 return NULL;
812
813 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
814}
815
816/*
817 * Must be called with target->scsi_host->host_lock held to protect
818 * req_lim and tx_head.
819 */
820static int __srp_post_send(struct srp_target_port *target,
821 struct srp_iu *iu, int len)
822{
823 struct ib_sge list;
824 struct ib_send_wr wr, *bad_wr;
825 int ret = 0;
826
827 if (target->req_lim < 1) {
828 printk(KERN_ERR PFX "Target has req_lim %d\n", target->req_lim);
829 return -EAGAIN;
830 }
831
832 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;
860 long req_index;
861 int len;
862
863 if (target->state == SRP_TARGET_CONNECTING)
864 goto err;
865
866 if (target->state == SRP_TARGET_DEAD ||
867 target->state == SRP_TARGET_REMOVED) {
868 scmnd->result = DID_BAD_TARGET << 16;
869 done(scmnd);
870 return 0;
871 }
872
873 iu = __srp_get_tx_iu(target);
874 if (!iu)
875 goto err;
876
877 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
878 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
879
880 req_index = target->req_head;
881
882 scmnd->scsi_done = done;
883 scmnd->result = 0;
884 scmnd->host_scribble = (void *) req_index;
885
886 cmd = iu->buf;
887 memset(cmd, 0, sizeof *cmd);
888
889 cmd->opcode = SRP_CMD;
890 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
891 cmd->tag = req_index;
892 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
893
894 req = &target->req_ring[req_index];
895
896 req->scmnd = scmnd;
897 req->cmd = iu;
898 req->cmd_done = 0;
899 req->tsk_mgmt = NULL;
900
901 len = srp_map_data(scmnd, target, req);
902 if (len < 0) {
903 printk(KERN_ERR PFX "Failed to map data\n");
904 goto err;
905 }
906
907 if (__srp_post_recv(target)) {
908 printk(KERN_ERR PFX "Recv failed\n");
909 goto err_unmap;
910 }
911
912 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
913 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
914
915 if (__srp_post_send(target, iu, len)) {
916 printk(KERN_ERR PFX "Send failed\n");
917 goto err_unmap;
918 }
919
920 target->req_head = req->next;
921 list_add_tail(&req->list, &target->req_queue);
922
923 return 0;
924
925err_unmap:
926 srp_unmap_data(scmnd, target, req);
927
928err:
929 return SCSI_MLQUEUE_HOST_BUSY;
930}
931
932static int srp_alloc_iu_bufs(struct srp_target_port *target)
933{
934 int i;
935
936 for (i = 0; i < SRP_RQ_SIZE; ++i) {
937 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
938 target->max_ti_iu_len,
939 GFP_KERNEL, DMA_FROM_DEVICE);
940 if (!target->rx_ring[i])
941 goto err;
942 }
943
944 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
945 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
946 SRP_MAX_IU_LEN,
947 GFP_KERNEL, DMA_TO_DEVICE);
948 if (!target->tx_ring[i])
949 goto err;
950 }
951
952 return 0;
953
954err:
955 for (i = 0; i < SRP_RQ_SIZE; ++i) {
956 srp_free_iu(target->srp_host, target->rx_ring[i]);
957 target->rx_ring[i] = NULL;
958 }
959
960 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
961 srp_free_iu(target->srp_host, target->tx_ring[i]);
962 target->tx_ring[i] = NULL;
963 }
964
965 return -ENOMEM;
966}
967
968static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
969 struct ib_cm_event *event,
970 struct srp_target_port *target)
971{
972 struct ib_class_port_info *cpi;
973 int opcode;
974
975 switch (event->param.rej_rcvd.reason) {
976 case IB_CM_REJ_PORT_CM_REDIRECT:
977 cpi = event->param.rej_rcvd.ari;
978 target->path.dlid = cpi->redirect_lid;
979 target->path.pkey = cpi->redirect_pkey;
980 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
981 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
982
983 target->status = target->path.dlid ?
984 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
985 break;
986
987 case IB_CM_REJ_PORT_REDIRECT:
988 if (topspin_workarounds &&
989 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
990 /*
991 * Topspin/Cisco SRP gateways incorrectly send
992 * reject reason code 25 when they mean 24
993 * (port redirect).
994 */
995 memcpy(target->path.dgid.raw,
996 event->param.rej_rcvd.ari, 16);
997
998 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
999 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1000 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1001
1002 target->status = SRP_PORT_REDIRECT;
1003 } else {
1004 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1005 target->status = -ECONNRESET;
1006 }
1007 break;
1008
1009 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1010 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1011 target->status = -ECONNRESET;
1012 break;
1013
1014 case IB_CM_REJ_CONSUMER_DEFINED:
1015 opcode = *(u8 *) event->private_data;
1016 if (opcode == SRP_LOGIN_REJ) {
1017 struct srp_login_rej *rej = event->private_data;
1018 u32 reason = be32_to_cpu(rej->reason);
1019
1020 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1021 printk(KERN_WARNING PFX
1022 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1023 else
1024 printk(KERN_WARNING PFX
1025 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1026 } else
1027 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1028 " opcode 0x%02x\n", opcode);
1029 target->status = -ECONNRESET;
1030 break;
1031
1032 default:
1033 printk(KERN_WARNING " REJ reason 0x%x\n",
1034 event->param.rej_rcvd.reason);
1035 target->status = -ECONNRESET;
1036 }
1037}
1038
1039static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1040{
1041 struct srp_target_port *target = cm_id->context;
1042 struct ib_qp_attr *qp_attr = NULL;
1043 int attr_mask = 0;
1044 int comp = 0;
1045 int opcode = 0;
1046
1047 switch (event->event) {
1048 case IB_CM_REQ_ERROR:
1049 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1050 comp = 1;
1051 target->status = -ECONNRESET;
1052 break;
1053
1054 case IB_CM_REP_RECEIVED:
1055 comp = 1;
1056 opcode = *(u8 *) event->private_data;
1057
1058 if (opcode == SRP_LOGIN_RSP) {
1059 struct srp_login_rsp *rsp = event->private_data;
1060
1061 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1062 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1063
1064 target->scsi_host->can_queue = min(target->req_lim,
1065 target->scsi_host->can_queue);
1066 } else {
1067 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1068 target->status = -ECONNRESET;
1069 break;
1070 }
1071
1072 target->status = srp_alloc_iu_bufs(target);
1073 if (target->status)
1074 break;
1075
1076 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1077 if (!qp_attr) {
1078 target->status = -ENOMEM;
1079 break;
1080 }
1081
1082 qp_attr->qp_state = IB_QPS_RTR;
1083 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1084 if (target->status)
1085 break;
1086
1087 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1088 if (target->status)
1089 break;
1090
1091 target->status = srp_post_recv(target);
1092 if (target->status)
1093 break;
1094
1095 qp_attr->qp_state = IB_QPS_RTS;
1096 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1097 if (target->status)
1098 break;
1099
1100 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1101 if (target->status)
1102 break;
1103
1104 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1105 if (target->status)
1106 break;
1107
1108 break;
1109
1110 case IB_CM_REJ_RECEIVED:
1111 printk(KERN_DEBUG PFX "REJ received\n");
1112 comp = 1;
1113
1114 srp_cm_rej_handler(cm_id, event, target);
1115 break;
1116
1117 case IB_CM_MRA_RECEIVED:
1118 printk(KERN_ERR PFX "MRA received\n");
1119 break;
1120
1121 case IB_CM_DREP_RECEIVED:
1122 break;
1123
1124 case IB_CM_TIMEWAIT_EXIT:
1125 printk(KERN_ERR PFX "connection closed\n");
1126
1127 comp = 1;
1128 target->status = 0;
1129 break;
1130
1131 default:
1132 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1133 break;
1134 }
1135
1136 if (comp)
1137 complete(&target->done);
1138
1139 kfree(qp_attr);
1140
1141 return 0;
1142}
1143
1144static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
1145{
1146 struct srp_target_port *target = host_to_target(scmnd->device->host);
1147 struct srp_request *req;
1148 struct srp_iu *iu;
1149 struct srp_tsk_mgmt *tsk_mgmt;
1150 int req_index;
1151 int ret = FAILED;
1152
1153 spin_lock_irq(target->scsi_host->host_lock);
1154
1155 if (scmnd->host_scribble == (void *) -1L)
1156 goto out;
1157
1158 req_index = (long) scmnd->host_scribble;
1159 printk(KERN_ERR "Abort for req_index %d\n", req_index);
1160
1161 req = &target->req_ring[req_index];
1162 init_completion(&req->done);
1163
1164 iu = __srp_get_tx_iu(target);
1165 if (!iu)
1166 goto out;
1167
1168 tsk_mgmt = iu->buf;
1169 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1170
1171 tsk_mgmt->opcode = SRP_TSK_MGMT;
1172 tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1173 tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
1174 tsk_mgmt->tsk_mgmt_func = func;
1175 tsk_mgmt->task_tag = req_index;
1176
1177 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1178 goto out;
1179
1180 req->tsk_mgmt = iu;
1181
1182 spin_unlock_irq(target->scsi_host->host_lock);
1183 if (!wait_for_completion_timeout(&req->done,
1184 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1185 return FAILED;
1186 spin_lock_irq(target->scsi_host->host_lock);
1187
1188 if (req->cmd_done) {
1189 list_del(&req->list);
1190 req->next = target->req_head;
1191 target->req_head = req_index;
1192
1193 scmnd->scsi_done(scmnd);
1194 } else if (!req->tsk_status) {
1195 scmnd->result = DID_ABORT << 16;
1196 ret = SUCCESS;
1197 }
1198
1199out:
1200 spin_unlock_irq(target->scsi_host->host_lock);
1201 return ret;
1202}
1203
1204static int srp_abort(struct scsi_cmnd *scmnd)
1205{
1206 printk(KERN_ERR "SRP abort called\n");
1207
1208 return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
1209}
1210
1211static int srp_reset_device(struct scsi_cmnd *scmnd)
1212{
1213 printk(KERN_ERR "SRP reset_device called\n");
1214
1215 return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
1216}
1217
1218static int srp_reset_host(struct scsi_cmnd *scmnd)
1219{
1220 struct srp_target_port *target = host_to_target(scmnd->device->host);
1221 int ret = FAILED;
1222
1223 printk(KERN_ERR PFX "SRP reset_host called\n");
1224
1225 if (!srp_reconnect_target(target))
1226 ret = SUCCESS;
1227
1228 return ret;
1229}
1230
1231static struct scsi_host_template srp_template = {
1232 .module = THIS_MODULE,
1233 .name = DRV_NAME,
1234 .info = srp_target_info,
1235 .queuecommand = srp_queuecommand,
1236 .eh_abort_handler = srp_abort,
1237 .eh_device_reset_handler = srp_reset_device,
1238 .eh_host_reset_handler = srp_reset_host,
1239 .can_queue = SRP_SQ_SIZE,
1240 .this_id = -1,
1241 .sg_tablesize = SRP_MAX_INDIRECT,
1242 .cmd_per_lun = SRP_SQ_SIZE,
1243 .use_clustering = ENABLE_CLUSTERING
1244};
1245
1246static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1247{
1248 sprintf(target->target_name, "SRP.T10:%016llX",
1249 (unsigned long long) be64_to_cpu(target->id_ext));
1250
1251 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1252 return -ENODEV;
1253
1254 down(&host->target_mutex);
1255 list_add_tail(&target->list, &host->target_list);
1256 up(&host->target_mutex);
1257
1258 target->state = SRP_TARGET_LIVE;
1259
1260 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1261 scsi_scan_target(&target->scsi_host->shost_gendev,
1262 0, target->scsi_id, ~0, 0);
1263
1264 return 0;
1265}
1266
1267static void srp_release_class_dev(struct class_device *class_dev)
1268{
1269 struct srp_host *host =
1270 container_of(class_dev, struct srp_host, class_dev);
1271
1272 complete(&host->released);
1273}
1274
1275static struct class srp_class = {
1276 .name = "infiniband_srp",
1277 .release = srp_release_class_dev
1278};
1279
1280/*
1281 * Target ports are added by writing
1282 *
1283 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1284 * pkey=<P_Key>,service_id=<service ID>
1285 *
1286 * to the add_target sysfs attribute.
1287 */
1288enum {
1289 SRP_OPT_ERR = 0,
1290 SRP_OPT_ID_EXT = 1 << 0,
1291 SRP_OPT_IOC_GUID = 1 << 1,
1292 SRP_OPT_DGID = 1 << 2,
1293 SRP_OPT_PKEY = 1 << 3,
1294 SRP_OPT_SERVICE_ID = 1 << 4,
1295 SRP_OPT_MAX_SECT = 1 << 5,
1296 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1297 SRP_OPT_IOC_GUID |
1298 SRP_OPT_DGID |
1299 SRP_OPT_PKEY |
1300 SRP_OPT_SERVICE_ID),
1301};
1302
1303static match_table_t srp_opt_tokens = {
1304 { SRP_OPT_ID_EXT, "id_ext=%s" },
1305 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1306 { SRP_OPT_DGID, "dgid=%s" },
1307 { SRP_OPT_PKEY, "pkey=%x" },
1308 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1309 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1310 { SRP_OPT_ERR, NULL }
1311};
1312
1313static int srp_parse_options(const char *buf, struct srp_target_port *target)
1314{
1315 char *options, *sep_opt;
1316 char *p;
1317 char dgid[3];
1318 substring_t args[MAX_OPT_ARGS];
1319 int opt_mask = 0;
1320 int token;
1321 int ret = -EINVAL;
1322 int i;
1323
1324 options = kstrdup(buf, GFP_KERNEL);
1325 if (!options)
1326 return -ENOMEM;
1327
1328 sep_opt = options;
1329 while ((p = strsep(&sep_opt, ",")) != NULL) {
1330 if (!*p)
1331 continue;
1332
1333 token = match_token(p, srp_opt_tokens, args);
1334 opt_mask |= token;
1335
1336 switch (token) {
1337 case SRP_OPT_ID_EXT:
1338 p = match_strdup(args);
1339 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1340 kfree(p);
1341 break;
1342
1343 case SRP_OPT_IOC_GUID:
1344 p = match_strdup(args);
1345 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1346 kfree(p);
1347 break;
1348
1349 case SRP_OPT_DGID:
1350 p = match_strdup(args);
1351 if (strlen(p) != 32) {
1352 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1353 goto out;
1354 }
1355
1356 for (i = 0; i < 16; ++i) {
1357 strlcpy(dgid, p + i * 2, 3);
1358 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1359 }
1360 break;
1361
1362 case SRP_OPT_PKEY:
1363 if (match_hex(args, &token)) {
1364 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1365 goto out;
1366 }
1367 target->path.pkey = cpu_to_be16(token);
1368 break;
1369
1370 case SRP_OPT_SERVICE_ID:
1371 p = match_strdup(args);
1372 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1373 kfree(p);
1374 break;
1375
1376 case SRP_OPT_MAX_SECT:
1377 if (match_int(args, &token)) {
1378 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1379 goto out;
1380 }
1381 target->scsi_host->max_sectors = token;
1382 break;
1383
1384 default:
1385 printk(KERN_WARNING PFX "unknown parameter or missing value "
1386 "'%s' in target creation request\n", p);
1387 goto out;
1388 }
1389 }
1390
1391 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1392 ret = 0;
1393 else
1394 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1395 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1396 !(srp_opt_tokens[i].token & opt_mask))
1397 printk(KERN_WARNING PFX "target creation request is "
1398 "missing parameter '%s'\n",
1399 srp_opt_tokens[i].pattern);
1400
1401out:
1402 kfree(options);
1403 return ret;
1404}
1405
1406static ssize_t srp_create_target(struct class_device *class_dev,
1407 const char *buf, size_t count)
1408{
1409 struct srp_host *host =
1410 container_of(class_dev, struct srp_host, class_dev);
1411 struct Scsi_Host *target_host;
1412 struct srp_target_port *target;
1413 int ret;
1414 int i;
1415
1416 target_host = scsi_host_alloc(&srp_template,
1417 sizeof (struct srp_target_port));
1418 if (!target_host)
1419 return -ENOMEM;
1420
1421 target = host_to_target(target_host);
1422 memset(target, 0, sizeof *target);
1423
1424 target->scsi_host = target_host;
1425 target->srp_host = host;
1426
1427 INIT_WORK(&target->work, srp_reconnect_work, target);
1428
1429 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
1430 target->req_ring[i].next = i + 1;
1431 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
1432 INIT_LIST_HEAD(&target->req_queue);
1433
1434 ret = srp_parse_options(buf, target);
1435 if (ret)
1436 goto err;
1437
1438 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1439
1440 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1441 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1442 (unsigned long long) be64_to_cpu(target->id_ext),
1443 (unsigned long long) be64_to_cpu(target->ioc_guid),
1444 be16_to_cpu(target->path.pkey),
1445 (unsigned long long) be64_to_cpu(target->service_id),
1446 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1447 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1448 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1449 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1450 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1451 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1452 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1453 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1454
1455 ret = srp_create_target_ib(target);
1456 if (ret)
1457 goto err;
1458
1459 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1460 if (IS_ERR(target->cm_id)) {
1461 ret = PTR_ERR(target->cm_id);
1462 goto err_free;
1463 }
1464
1465 ret = srp_connect_target(target);
1466 if (ret) {
1467 printk(KERN_ERR PFX "Connection failed\n");
1468 goto err_cm_id;
1469 }
1470
1471 ret = srp_add_target(host, target);
1472 if (ret)
1473 goto err_disconnect;
1474
1475 return count;
1476
1477err_disconnect:
1478 srp_disconnect_target(target);
1479
1480err_cm_id:
1481 ib_destroy_cm_id(target->cm_id);
1482
1483err_free:
1484 srp_free_target_ib(target);
1485
1486err:
1487 scsi_host_put(target_host);
1488
1489 return ret;
1490}
1491
1492static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1493
1494static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1495{
1496 struct srp_host *host =
1497 container_of(class_dev, struct srp_host, class_dev);
1498
1499 return sprintf(buf, "%s\n", host->dev->name);
1500}
1501
1502static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1503
1504static ssize_t show_port(struct class_device *class_dev, char *buf)
1505{
1506 struct srp_host *host =
1507 container_of(class_dev, struct srp_host, class_dev);
1508
1509 return sprintf(buf, "%d\n", host->port);
1510}
1511
1512static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1513
1514static struct srp_host *srp_add_port(struct ib_device *device,
1515 __be64 node_guid, u8 port)
1516{
1517 struct srp_host *host;
1518
1519 host = kzalloc(sizeof *host, GFP_KERNEL);
1520 if (!host)
1521 return NULL;
1522
1523 INIT_LIST_HEAD(&host->target_list);
1524 init_MUTEX(&host->target_mutex);
1525 init_completion(&host->released);
1526 host->dev = device;
1527 host->port = port;
1528
1529 host->initiator_port_id[7] = port;
1530 memcpy(host->initiator_port_id + 8, &node_guid, 8);
1531
1532 host->pd = ib_alloc_pd(device);
1533 if (IS_ERR(host->pd))
1534 goto err_free;
1535
1536 host->mr = ib_get_dma_mr(host->pd,
1537 IB_ACCESS_LOCAL_WRITE |
1538 IB_ACCESS_REMOTE_READ |
1539 IB_ACCESS_REMOTE_WRITE);
1540 if (IS_ERR(host->mr))
1541 goto err_pd;
1542
1543 host->class_dev.class = &srp_class;
1544 host->class_dev.dev = device->dma_device;
1545 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1546 device->name, port);
1547
1548 if (class_device_register(&host->class_dev))
1549 goto err_mr;
1550 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1551 goto err_class;
1552 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1553 goto err_class;
1554 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1555 goto err_class;
1556
1557 return host;
1558
1559err_class:
1560 class_device_unregister(&host->class_dev);
1561
1562err_mr:
1563 ib_dereg_mr(host->mr);
1564
1565err_pd:
1566 ib_dealloc_pd(host->pd);
1567
1568err_free:
1569 kfree(host);
1570
1571 return NULL;
1572}
1573
1574static void srp_add_one(struct ib_device *device)
1575{
1576 struct list_head *dev_list;
1577 struct srp_host *host;
1578 struct ib_device_attr *dev_attr;
1579 int s, e, p;
1580
1581 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1582 if (!dev_attr)
1583 return;
1584
1585 if (ib_query_device(device, dev_attr)) {
1586 printk(KERN_WARNING PFX "Couldn't query node GUID for %s.\n",
1587 device->name);
1588 goto out;
1589 }
1590
1591 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1592 if (!dev_list)
1593 goto out;
1594
1595 INIT_LIST_HEAD(dev_list);
1596
1597 if (device->node_type == IB_NODE_SWITCH) {
1598 s = 0;
1599 e = 0;
1600 } else {
1601 s = 1;
1602 e = device->phys_port_cnt;
1603 }
1604
1605 for (p = s; p <= e; ++p) {
1606 host = srp_add_port(device, dev_attr->node_guid, p);
1607 if (host)
1608 list_add_tail(&host->list, dev_list);
1609 }
1610
1611 ib_set_client_data(device, &srp_client, dev_list);
1612
1613out:
1614 kfree(dev_attr);
1615}
1616
1617static void srp_remove_one(struct ib_device *device)
1618{
1619 struct list_head *dev_list;
1620 struct srp_host *host, *tmp_host;
1621 LIST_HEAD(target_list);
1622 struct srp_target_port *target, *tmp_target;
1623 unsigned long flags;
1624
1625 dev_list = ib_get_client_data(device, &srp_client);
1626
1627 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1628 class_device_unregister(&host->class_dev);
1629 /*
1630 * Wait for the sysfs entry to go away, so that no new
1631 * target ports can be created.
1632 */
1633 wait_for_completion(&host->released);
1634
1635 /*
1636 * Mark all target ports as removed, so we stop queueing
1637 * commands and don't try to reconnect.
1638 */
1639 down(&host->target_mutex);
1640 list_for_each_entry_safe(target, tmp_target,
1641 &host->target_list, list) {
1642 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1643 if (target->state != SRP_TARGET_REMOVED)
1644 target->state = SRP_TARGET_REMOVED;
1645 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1646 }
1647 up(&host->target_mutex);
1648
1649 /*
1650 * Wait for any reconnection tasks that may have
1651 * started before we marked our target ports as
1652 * removed, and any target port removal tasks.
1653 */
1654 flush_scheduled_work();
1655
1656 list_for_each_entry_safe(target, tmp_target,
1657 &host->target_list, list) {
1658 scsi_remove_host(target->scsi_host);
1659 srp_disconnect_target(target);
1660 ib_destroy_cm_id(target->cm_id);
1661 srp_free_target_ib(target);
1662 scsi_host_put(target->scsi_host);
1663 }
1664
1665 ib_dereg_mr(host->mr);
1666 ib_dealloc_pd(host->pd);
1667 kfree(host);
1668 }
1669
1670 kfree(dev_list);
1671}
1672
1673static int __init srp_init_module(void)
1674{
1675 int ret;
1676
1677 ret = class_register(&srp_class);
1678 if (ret) {
1679 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1680 return ret;
1681 }
1682
1683 ret = ib_register_client(&srp_client);
1684 if (ret) {
1685 printk(KERN_ERR PFX "couldn't register IB client\n");
1686 class_unregister(&srp_class);
1687 return ret;
1688 }
1689
1690 return 0;
1691}
1692
1693static void __exit srp_cleanup_module(void)
1694{
1695 ib_unregister_client(&srp_client);
1696 class_unregister(&srp_class);
1697}
1698
1699module_init(srp_init_module);
1700module_exit(srp_cleanup_module);
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
new file mode 100644
index 000000000000..4fec28a71367
--- /dev/null
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -0,0 +1,150 @@
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.h 3932 2005-11-01 17:19:29Z roland $
33 */
34
35#ifndef IB_SRP_H
36#define IB_SRP_H
37
38#include <linux/types.h>
39#include <linux/list.h>
40
41#include <asm/semaphore.h>
42
43#include <scsi/scsi_host.h>
44#include <scsi/scsi_cmnd.h>
45
46#include <rdma/ib_verbs.h>
47#include <rdma/ib_sa.h>
48#include <rdma/ib_cm.h>
49
50enum {
51 SRP_PATH_REC_TIMEOUT_MS = 1000,
52 SRP_ABORT_TIMEOUT_MS = 5000,
53
54 SRP_PORT_REDIRECT = 1,
55 SRP_DLID_REDIRECT = 2,
56
57 SRP_MAX_IU_LEN = 256,
58
59 SRP_RQ_SHIFT = 6,
60 SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
61 SRP_SQ_SIZE = SRP_RQ_SIZE - 1,
62 SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE,
63
64 SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1)
65};
66
67#define SRP_OP_RECV (1 << 31)
68#define SRP_MAX_INDIRECT ((SRP_MAX_IU_LEN - \
69 sizeof (struct srp_cmd) - \
70 sizeof (struct srp_indirect_buf)) / 16)
71
72enum srp_target_state {
73 SRP_TARGET_LIVE,
74 SRP_TARGET_CONNECTING,
75 SRP_TARGET_DEAD,
76 SRP_TARGET_REMOVED
77};
78
79struct srp_host {
80 u8 initiator_port_id[16];
81 struct ib_device *dev;
82 u8 port;
83 struct ib_pd *pd;
84 struct ib_mr *mr;
85 struct class_device class_dev;
86 struct list_head target_list;
87 struct semaphore target_mutex;
88 struct completion released;
89 struct list_head list;
90};
91
92struct srp_request {
93 struct list_head list;
94 struct scsi_cmnd *scmnd;
95 struct srp_iu *cmd;
96 struct srp_iu *tsk_mgmt;
97 DECLARE_PCI_UNMAP_ADDR(direct_mapping)
98 struct completion done;
99 short next;
100 u8 cmd_done;
101 u8 tsk_status;
102};
103
104struct srp_target_port {
105 __be64 id_ext;
106 __be64 ioc_guid;
107 __be64 service_id;
108 struct srp_host *srp_host;
109 struct Scsi_Host *scsi_host;
110 char target_name[32];
111 unsigned int scsi_id;
112
113 struct ib_sa_path_rec path;
114 struct ib_sa_query *path_query;
115 int path_query_id;
116
117 struct ib_cm_id *cm_id;
118 struct ib_cq *cq;
119 struct ib_qp *qp;
120
121 int max_ti_iu_len;
122 s32 req_lim;
123
124 unsigned rx_head;
125 struct srp_iu *rx_ring[SRP_RQ_SIZE];
126
127 unsigned tx_head;
128 unsigned tx_tail;
129 struct srp_iu *tx_ring[SRP_SQ_SIZE + 1];
130
131 int req_head;
132 struct list_head req_queue;
133 struct srp_request req_ring[SRP_SQ_SIZE];
134
135 struct work_struct work;
136
137 struct list_head list;
138 struct completion done;
139 int status;
140 enum srp_target_state state;
141};
142
143struct srp_iu {
144 dma_addr_t dma;
145 void *buf;
146 size_t size;
147 enum dma_data_direction direction;
148};
149
150#endif /* IB_SRP_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-17 22:53:12 -0500