diff options
Diffstat (limited to 'drivers/infiniband')
-rw-r--r-- | drivers/infiniband/Kconfig | 2 | ||||
-rw-r--r-- | drivers/infiniband/Makefile | 1 | ||||
-rw-r--r-- | drivers/infiniband/ulp/srp/Kbuild | 1 | ||||
-rw-r--r-- | drivers/infiniband/ulp/srp/Kconfig | 11 | ||||
-rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.c | 1700 | ||||
-rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.h | 150 |
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 | ||
34 | source "drivers/infiniband/ulp/ipoib/Kconfig" | 34 | source "drivers/infiniband/ulp/ipoib/Kconfig" |
35 | 35 | ||
36 | source "drivers/infiniband/ulp/srp/Kconfig" | ||
37 | |||
36 | endmenu | 38 | endmenu |
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 @@ | |||
1 | obj-$(CONFIG_INFINIBAND) += core/ | 1 | obj-$(CONFIG_INFINIBAND) += core/ |
2 | obj-$(CONFIG_INFINIBAND_MTHCA) += hw/mthca/ | 2 | obj-$(CONFIG_INFINIBAND_MTHCA) += hw/mthca/ |
3 | obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/ | 3 | obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/ |
4 | obj-$(CONFIG_INFINIBAND_SRP) += ulp/srp/ | ||
diff --git a/drivers/infiniband/ulp/srp/Kbuild b/drivers/infiniband/ulp/srp/Kbuild new file mode 100644 index 000000000000..a16c73c667cb --- /dev/null +++ b/drivers/infiniband/ulp/srp/Kbuild | |||
@@ -0,0 +1 @@ | |||
obj-$(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 @@ | |||
1 | config 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 | |||
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 topspin_workarounds = 1; | ||
66 | |||
67 | module_param(topspin_workarounds, int, 0444); | ||
68 | MODULE_PARM_DESC(topspin_workarounds, | ||
69 | "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); | ||
70 | |||
71 | static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; | ||
72 | |||
73 | static void srp_add_one(struct ib_device *device); | ||
74 | static void srp_remove_one(struct ib_device *device); | ||
75 | static void srp_completion(struct ib_cq *cq, void *target_ptr); | ||
76 | static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); | ||
77 | |||
78 | static struct ib_client srp_client = { | ||
79 | .name = "srp", | ||
80 | .add = srp_add_one, | ||
81 | .remove = srp_remove_one | ||
82 | }; | ||
83 | |||
84 | static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) | ||
85 | { | ||
86 | return (struct srp_target_port *) host->hostdata; | ||
87 | } | ||
88 | |||
89 | static const char *srp_target_info(struct Scsi_Host *host) | ||
90 | { | ||
91 | return host_to_target(host)->target_name; | ||
92 | } | ||
93 | |||
94 | static 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 | |||
117 | out_free_buf: | ||
118 | kfree(iu->buf); | ||
119 | out_free_iu: | ||
120 | kfree(iu); | ||
121 | out: | ||
122 | return NULL; | ||
123 | } | ||
124 | |||
125 | static 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 | |||
135 | static void srp_qp_event(struct ib_event *event, void *context) | ||
136 | { | ||
137 | printk(KERN_ERR PFX "QP event %d\n", event->event); | ||
138 | } | ||
139 | |||
140 | static 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 | |||
168 | out: | ||
169 | kfree(attr); | ||
170 | return ret; | ||
171 | } | ||
172 | |||
173 | static 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 | |||
215 | out: | ||
216 | kfree(init_attr); | ||
217 | return ret; | ||
218 | } | ||
219 | |||
220 | static 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 | |||
233 | static 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 | |||
247 | static 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 | |||
275 | static 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 | |||
338 | static 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 | |||
347 | static 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 | |||
372 | static 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 | |||
412 | static 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 | |||
483 | err: | ||
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 | |||
503 | static 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 | |||
607 | static 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 | |||
627 | static 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 | |||
684 | static void srp_reconnect_work(void *target_ptr) | ||
685 | { | ||
686 | struct srp_target_port *target = target_ptr; | ||
687 | |||
688 | srp_reconnect_target(target); | ||
689 | } | ||
690 | |||
691 | static 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 | |||
739 | static 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 | |||
765 | static 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 | |||
792 | static 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 | */ | ||
808 | static 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 | */ | ||
820 | static 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 | |||
853 | static 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 | |||
925 | err_unmap: | ||
926 | srp_unmap_data(scmnd, target, req); | ||
927 | |||
928 | err: | ||
929 | return SCSI_MLQUEUE_HOST_BUSY; | ||
930 | } | ||
931 | |||
932 | static 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 | |||
954 | err: | ||
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 | |||
968 | static 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 | |||
1039 | static 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 | |||
1144 | static 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 | |||
1199 | out: | ||
1200 | spin_unlock_irq(target->scsi_host->host_lock); | ||
1201 | return ret; | ||
1202 | } | ||
1203 | |||
1204 | static 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 | |||
1211 | static 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 | |||
1218 | static 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 | |||
1231 | static 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 | |||
1246 | static 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 | |||
1267 | static 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 | |||
1275 | static 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 | */ | ||
1288 | enum { | ||
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 | |||
1303 | static 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 | |||
1313 | static 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 | |||
1401 | out: | ||
1402 | kfree(options); | ||
1403 | return ret; | ||
1404 | } | ||
1405 | |||
1406 | static 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 | |||
1477 | err_disconnect: | ||
1478 | srp_disconnect_target(target); | ||
1479 | |||
1480 | err_cm_id: | ||
1481 | ib_destroy_cm_id(target->cm_id); | ||
1482 | |||
1483 | err_free: | ||
1484 | srp_free_target_ib(target); | ||
1485 | |||
1486 | err: | ||
1487 | scsi_host_put(target_host); | ||
1488 | |||
1489 | return ret; | ||
1490 | } | ||
1491 | |||
1492 | static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); | ||
1493 | |||
1494 | static 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 | |||
1502 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | ||
1503 | |||
1504 | static 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 | |||
1512 | static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); | ||
1513 | |||
1514 | static 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 | |||
1559 | err_class: | ||
1560 | class_device_unregister(&host->class_dev); | ||
1561 | |||
1562 | err_mr: | ||
1563 | ib_dereg_mr(host->mr); | ||
1564 | |||
1565 | err_pd: | ||
1566 | ib_dealloc_pd(host->pd); | ||
1567 | |||
1568 | err_free: | ||
1569 | kfree(host); | ||
1570 | |||
1571 | return NULL; | ||
1572 | } | ||
1573 | |||
1574 | static 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 | |||
1613 | out: | ||
1614 | kfree(dev_attr); | ||
1615 | } | ||
1616 | |||
1617 | static 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 | |||
1673 | static 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 | |||
1693 | static void __exit srp_cleanup_module(void) | ||
1694 | { | ||
1695 | ib_unregister_client(&srp_client); | ||
1696 | class_unregister(&srp_class); | ||
1697 | } | ||
1698 | |||
1699 | module_init(srp_init_module); | ||
1700 | module_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 | |||
50 | enum { | ||
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 | |||
72 | enum srp_target_state { | ||
73 | SRP_TARGET_LIVE, | ||
74 | SRP_TARGET_CONNECTING, | ||
75 | SRP_TARGET_DEAD, | ||
76 | SRP_TARGET_REMOVED | ||
77 | }; | ||
78 | |||
79 | struct 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 | |||
92 | struct 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 | |||
104 | struct 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 | |||
143 | struct 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 */ | ||