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a42d985b BVA |
1 | /* |
2 | * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved. | |
3 | * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>. | |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | * | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/err.h> | |
39 | #include <linux/ctype.h> | |
40 | #include <linux/kthread.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/delay.h> | |
43 | #include <linux/atomic.h> | |
ba929992 | 44 | #include <scsi/scsi_proto.h> |
a42d985b | 45 | #include <scsi/scsi_tcq.h> |
a42d985b | 46 | #include <target/target_core_base.h> |
a42d985b | 47 | #include <target/target_core_fabric.h> |
a42d985b BVA |
48 | #include "ib_srpt.h" |
49 | ||
50 | /* Name of this kernel module. */ | |
51 | #define DRV_NAME "ib_srpt" | |
52 | #define DRV_VERSION "2.0.0" | |
53 | #define DRV_RELDATE "2011-02-14" | |
54 | ||
55 | #define SRPT_ID_STRING "Linux SRP target" | |
56 | ||
57 | #undef pr_fmt | |
58 | #define pr_fmt(fmt) DRV_NAME " " fmt | |
59 | ||
60 | MODULE_AUTHOR("Vu Pham and Bart Van Assche"); | |
61 | MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target " | |
62 | "v" DRV_VERSION " (" DRV_RELDATE ")"); | |
63 | MODULE_LICENSE("Dual BSD/GPL"); | |
64 | ||
65 | /* | |
66 | * Global Variables | |
67 | */ | |
68 | ||
69 | static u64 srpt_service_guid; | |
486d8b9f RD |
70 | static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */ |
71 | static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */ | |
a42d985b BVA |
72 | |
73 | static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE; | |
74 | module_param(srp_max_req_size, int, 0444); | |
75 | MODULE_PARM_DESC(srp_max_req_size, | |
76 | "Maximum size of SRP request messages in bytes."); | |
77 | ||
78 | static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE; | |
79 | module_param(srpt_srq_size, int, 0444); | |
80 | MODULE_PARM_DESC(srpt_srq_size, | |
81 | "Shared receive queue (SRQ) size."); | |
82 | ||
83 | static int srpt_get_u64_x(char *buffer, struct kernel_param *kp) | |
84 | { | |
85 | return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg); | |
86 | } | |
87 | module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid, | |
88 | 0444); | |
89 | MODULE_PARM_DESC(srpt_service_guid, | |
90 | "Using this value for ioc_guid, id_ext, and cm_listen_id" | |
91 | " instead of using the node_guid of the first HCA."); | |
92 | ||
93 | static struct ib_client srpt_client; | |
2c7f37ff | 94 | static void srpt_release_cmd(struct se_cmd *se_cmd); |
a42d985b BVA |
95 | static void srpt_release_channel(struct srpt_rdma_ch *ch); |
96 | static int srpt_queue_status(struct se_cmd *cmd); | |
59fae4de CH |
97 | static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc); |
98 | static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc); | |
a42d985b | 99 | |
f130c220 BVA |
100 | /* |
101 | * The only allowed channel state changes are those that change the channel | |
102 | * state into a state with a higher numerical value. Hence the new > prev test. | |
a42d985b | 103 | */ |
f130c220 | 104 | static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new) |
a42d985b BVA |
105 | { |
106 | unsigned long flags; | |
107 | enum rdma_ch_state prev; | |
f130c220 | 108 | bool changed = false; |
a42d985b BVA |
109 | |
110 | spin_lock_irqsave(&ch->spinlock, flags); | |
111 | prev = ch->state; | |
f130c220 | 112 | if (new > prev) { |
a42d985b | 113 | ch->state = new; |
f130c220 BVA |
114 | changed = true; |
115 | } | |
a42d985b | 116 | spin_unlock_irqrestore(&ch->spinlock, flags); |
f130c220 BVA |
117 | |
118 | return changed; | |
a42d985b BVA |
119 | } |
120 | ||
121 | /** | |
122 | * srpt_event_handler() - Asynchronous IB event callback function. | |
123 | * | |
124 | * Callback function called by the InfiniBand core when an asynchronous IB | |
125 | * event occurs. This callback may occur in interrupt context. See also | |
126 | * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand | |
127 | * Architecture Specification. | |
128 | */ | |
129 | static void srpt_event_handler(struct ib_event_handler *handler, | |
130 | struct ib_event *event) | |
131 | { | |
132 | struct srpt_device *sdev; | |
133 | struct srpt_port *sport; | |
134 | ||
135 | sdev = ib_get_client_data(event->device, &srpt_client); | |
136 | if (!sdev || sdev->device != event->device) | |
137 | return; | |
138 | ||
139 | pr_debug("ASYNC event= %d on device= %s\n", event->event, | |
f68cba4e | 140 | sdev->device->name); |
a42d985b BVA |
141 | |
142 | switch (event->event) { | |
143 | case IB_EVENT_PORT_ERR: | |
144 | if (event->element.port_num <= sdev->device->phys_port_cnt) { | |
145 | sport = &sdev->port[event->element.port_num - 1]; | |
146 | sport->lid = 0; | |
147 | sport->sm_lid = 0; | |
148 | } | |
149 | break; | |
150 | case IB_EVENT_PORT_ACTIVE: | |
151 | case IB_EVENT_LID_CHANGE: | |
152 | case IB_EVENT_PKEY_CHANGE: | |
153 | case IB_EVENT_SM_CHANGE: | |
154 | case IB_EVENT_CLIENT_REREGISTER: | |
2aa1cf64 | 155 | case IB_EVENT_GID_CHANGE: |
a42d985b BVA |
156 | /* Refresh port data asynchronously. */ |
157 | if (event->element.port_num <= sdev->device->phys_port_cnt) { | |
158 | sport = &sdev->port[event->element.port_num - 1]; | |
159 | if (!sport->lid && !sport->sm_lid) | |
160 | schedule_work(&sport->work); | |
161 | } | |
162 | break; | |
163 | default: | |
9f5d32af | 164 | pr_err("received unrecognized IB event %d\n", |
a42d985b BVA |
165 | event->event); |
166 | break; | |
167 | } | |
168 | } | |
169 | ||
170 | /** | |
171 | * srpt_srq_event() - SRQ event callback function. | |
172 | */ | |
173 | static void srpt_srq_event(struct ib_event *event, void *ctx) | |
174 | { | |
9f5d32af | 175 | pr_info("SRQ event %d\n", event->event); |
a42d985b BVA |
176 | } |
177 | ||
178 | /** | |
179 | * srpt_qp_event() - QP event callback function. | |
180 | */ | |
181 | static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch) | |
182 | { | |
183 | pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n", | |
33912d73 | 184 | event->event, ch->cm_id, ch->sess_name, ch->state); |
a42d985b BVA |
185 | |
186 | switch (event->event) { | |
187 | case IB_EVENT_COMM_EST: | |
188 | ib_cm_notify(ch->cm_id, event->event); | |
189 | break; | |
190 | case IB_EVENT_QP_LAST_WQE_REACHED: | |
f130c220 | 191 | if (srpt_set_ch_state(ch, CH_RELEASING)) |
a42d985b BVA |
192 | srpt_release_channel(ch); |
193 | else | |
194 | pr_debug("%s: state %d - ignored LAST_WQE.\n", | |
33912d73 | 195 | ch->sess_name, ch->state); |
a42d985b BVA |
196 | break; |
197 | default: | |
9f5d32af | 198 | pr_err("received unrecognized IB QP event %d\n", event->event); |
a42d985b BVA |
199 | break; |
200 | } | |
201 | } | |
202 | ||
203 | /** | |
204 | * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure. | |
205 | * | |
206 | * @slot: one-based slot number. | |
207 | * @value: four-bit value. | |
208 | * | |
209 | * Copies the lowest four bits of value in element slot of the array of four | |
210 | * bit elements called c_list (controller list). The index slot is one-based. | |
211 | */ | |
212 | static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value) | |
213 | { | |
214 | u16 id; | |
215 | u8 tmp; | |
216 | ||
217 | id = (slot - 1) / 2; | |
218 | if (slot & 0x1) { | |
219 | tmp = c_list[id] & 0xf; | |
220 | c_list[id] = (value << 4) | tmp; | |
221 | } else { | |
222 | tmp = c_list[id] & 0xf0; | |
223 | c_list[id] = (value & 0xf) | tmp; | |
224 | } | |
225 | } | |
226 | ||
227 | /** | |
228 | * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram. | |
229 | * | |
230 | * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture | |
231 | * Specification. | |
232 | */ | |
233 | static void srpt_get_class_port_info(struct ib_dm_mad *mad) | |
234 | { | |
235 | struct ib_class_port_info *cif; | |
236 | ||
237 | cif = (struct ib_class_port_info *)mad->data; | |
9d2aa2b4 | 238 | memset(cif, 0, sizeof(*cif)); |
a42d985b BVA |
239 | cif->base_version = 1; |
240 | cif->class_version = 1; | |
241 | cif->resp_time_value = 20; | |
242 | ||
243 | mad->mad_hdr.status = 0; | |
244 | } | |
245 | ||
246 | /** | |
247 | * srpt_get_iou() - Write IOUnitInfo to a management datagram. | |
248 | * | |
249 | * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture | |
250 | * Specification. See also section B.7, table B.6 in the SRP r16a document. | |
251 | */ | |
252 | static void srpt_get_iou(struct ib_dm_mad *mad) | |
253 | { | |
254 | struct ib_dm_iou_info *ioui; | |
255 | u8 slot; | |
256 | int i; | |
257 | ||
258 | ioui = (struct ib_dm_iou_info *)mad->data; | |
b356c1c1 | 259 | ioui->change_id = cpu_to_be16(1); |
a42d985b BVA |
260 | ioui->max_controllers = 16; |
261 | ||
262 | /* set present for slot 1 and empty for the rest */ | |
263 | srpt_set_ioc(ioui->controller_list, 1, 1); | |
264 | for (i = 1, slot = 2; i < 16; i++, slot++) | |
265 | srpt_set_ioc(ioui->controller_list, slot, 0); | |
266 | ||
267 | mad->mad_hdr.status = 0; | |
268 | } | |
269 | ||
270 | /** | |
271 | * srpt_get_ioc() - Write IOControllerprofile to a management datagram. | |
272 | * | |
273 | * See also section 16.3.3.4 IOControllerProfile in the InfiniBand | |
274 | * Architecture Specification. See also section B.7, table B.7 in the SRP | |
275 | * r16a document. | |
276 | */ | |
277 | static void srpt_get_ioc(struct srpt_port *sport, u32 slot, | |
278 | struct ib_dm_mad *mad) | |
279 | { | |
280 | struct srpt_device *sdev = sport->sdev; | |
281 | struct ib_dm_ioc_profile *iocp; | |
282 | ||
283 | iocp = (struct ib_dm_ioc_profile *)mad->data; | |
284 | ||
285 | if (!slot || slot > 16) { | |
286 | mad->mad_hdr.status | |
b356c1c1 | 287 | = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
a42d985b BVA |
288 | return; |
289 | } | |
290 | ||
291 | if (slot > 2) { | |
292 | mad->mad_hdr.status | |
b356c1c1 | 293 | = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
a42d985b BVA |
294 | return; |
295 | } | |
296 | ||
9d2aa2b4 | 297 | memset(iocp, 0, sizeof(*iocp)); |
a42d985b BVA |
298 | strcpy(iocp->id_string, SRPT_ID_STRING); |
299 | iocp->guid = cpu_to_be64(srpt_service_guid); | |
4a061b28 OG |
300 | iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); |
301 | iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id); | |
302 | iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver); | |
303 | iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); | |
a42d985b | 304 | iocp->subsys_device_id = 0x0; |
b356c1c1 VT |
305 | iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS); |
306 | iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS); | |
307 | iocp->protocol = cpu_to_be16(SRP_PROTOCOL); | |
308 | iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION); | |
a42d985b BVA |
309 | iocp->send_queue_depth = cpu_to_be16(sdev->srq_size); |
310 | iocp->rdma_read_depth = 4; | |
311 | iocp->send_size = cpu_to_be32(srp_max_req_size); | |
312 | iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size, | |
313 | 1U << 24)); | |
314 | iocp->num_svc_entries = 1; | |
315 | iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC | | |
316 | SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC; | |
317 | ||
318 | mad->mad_hdr.status = 0; | |
319 | } | |
320 | ||
321 | /** | |
322 | * srpt_get_svc_entries() - Write ServiceEntries to a management datagram. | |
323 | * | |
324 | * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture | |
325 | * Specification. See also section B.7, table B.8 in the SRP r16a document. | |
326 | */ | |
327 | static void srpt_get_svc_entries(u64 ioc_guid, | |
328 | u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad) | |
329 | { | |
330 | struct ib_dm_svc_entries *svc_entries; | |
331 | ||
332 | WARN_ON(!ioc_guid); | |
333 | ||
334 | if (!slot || slot > 16) { | |
335 | mad->mad_hdr.status | |
b356c1c1 | 336 | = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
a42d985b BVA |
337 | return; |
338 | } | |
339 | ||
340 | if (slot > 2 || lo > hi || hi > 1) { | |
341 | mad->mad_hdr.status | |
b356c1c1 | 342 | = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
a42d985b BVA |
343 | return; |
344 | } | |
345 | ||
346 | svc_entries = (struct ib_dm_svc_entries *)mad->data; | |
9d2aa2b4 | 347 | memset(svc_entries, 0, sizeof(*svc_entries)); |
a42d985b BVA |
348 | svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid); |
349 | snprintf(svc_entries->service_entries[0].name, | |
350 | sizeof(svc_entries->service_entries[0].name), | |
351 | "%s%016llx", | |
352 | SRP_SERVICE_NAME_PREFIX, | |
353 | ioc_guid); | |
354 | ||
355 | mad->mad_hdr.status = 0; | |
356 | } | |
357 | ||
358 | /** | |
359 | * srpt_mgmt_method_get() - Process a received management datagram. | |
360 | * @sp: source port through which the MAD has been received. | |
361 | * @rq_mad: received MAD. | |
362 | * @rsp_mad: response MAD. | |
363 | */ | |
364 | static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad, | |
365 | struct ib_dm_mad *rsp_mad) | |
366 | { | |
367 | u16 attr_id; | |
368 | u32 slot; | |
369 | u8 hi, lo; | |
370 | ||
371 | attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id); | |
372 | switch (attr_id) { | |
373 | case DM_ATTR_CLASS_PORT_INFO: | |
374 | srpt_get_class_port_info(rsp_mad); | |
375 | break; | |
376 | case DM_ATTR_IOU_INFO: | |
377 | srpt_get_iou(rsp_mad); | |
378 | break; | |
379 | case DM_ATTR_IOC_PROFILE: | |
380 | slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); | |
381 | srpt_get_ioc(sp, slot, rsp_mad); | |
382 | break; | |
383 | case DM_ATTR_SVC_ENTRIES: | |
384 | slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); | |
385 | hi = (u8) ((slot >> 8) & 0xff); | |
386 | lo = (u8) (slot & 0xff); | |
387 | slot = (u16) ((slot >> 16) & 0xffff); | |
388 | srpt_get_svc_entries(srpt_service_guid, | |
389 | slot, hi, lo, rsp_mad); | |
390 | break; | |
391 | default: | |
392 | rsp_mad->mad_hdr.status = | |
b356c1c1 | 393 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
a42d985b BVA |
394 | break; |
395 | } | |
396 | } | |
397 | ||
398 | /** | |
399 | * srpt_mad_send_handler() - Post MAD-send callback function. | |
400 | */ | |
401 | static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent, | |
402 | struct ib_mad_send_wc *mad_wc) | |
403 | { | |
404 | ib_destroy_ah(mad_wc->send_buf->ah); | |
405 | ib_free_send_mad(mad_wc->send_buf); | |
406 | } | |
407 | ||
408 | /** | |
409 | * srpt_mad_recv_handler() - MAD reception callback function. | |
410 | */ | |
411 | static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent, | |
ca281265 | 412 | struct ib_mad_send_buf *send_buf, |
a42d985b BVA |
413 | struct ib_mad_recv_wc *mad_wc) |
414 | { | |
415 | struct srpt_port *sport = (struct srpt_port *)mad_agent->context; | |
416 | struct ib_ah *ah; | |
417 | struct ib_mad_send_buf *rsp; | |
418 | struct ib_dm_mad *dm_mad; | |
419 | ||
420 | if (!mad_wc || !mad_wc->recv_buf.mad) | |
421 | return; | |
422 | ||
423 | ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc, | |
424 | mad_wc->recv_buf.grh, mad_agent->port_num); | |
425 | if (IS_ERR(ah)) | |
426 | goto err; | |
427 | ||
428 | BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR); | |
429 | ||
430 | rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp, | |
431 | mad_wc->wc->pkey_index, 0, | |
432 | IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA, | |
da2dfaa3 IW |
433 | GFP_KERNEL, |
434 | IB_MGMT_BASE_VERSION); | |
a42d985b BVA |
435 | if (IS_ERR(rsp)) |
436 | goto err_rsp; | |
437 | ||
438 | rsp->ah = ah; | |
439 | ||
440 | dm_mad = rsp->mad; | |
9d2aa2b4 | 441 | memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad)); |
a42d985b BVA |
442 | dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP; |
443 | dm_mad->mad_hdr.status = 0; | |
444 | ||
445 | switch (mad_wc->recv_buf.mad->mad_hdr.method) { | |
446 | case IB_MGMT_METHOD_GET: | |
447 | srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad); | |
448 | break; | |
449 | case IB_MGMT_METHOD_SET: | |
450 | dm_mad->mad_hdr.status = | |
b356c1c1 | 451 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
a42d985b BVA |
452 | break; |
453 | default: | |
454 | dm_mad->mad_hdr.status = | |
b356c1c1 | 455 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD); |
a42d985b BVA |
456 | break; |
457 | } | |
458 | ||
459 | if (!ib_post_send_mad(rsp, NULL)) { | |
460 | ib_free_recv_mad(mad_wc); | |
461 | /* will destroy_ah & free_send_mad in send completion */ | |
462 | return; | |
463 | } | |
464 | ||
465 | ib_free_send_mad(rsp); | |
466 | ||
467 | err_rsp: | |
468 | ib_destroy_ah(ah); | |
469 | err: | |
470 | ib_free_recv_mad(mad_wc); | |
471 | } | |
472 | ||
473 | /** | |
474 | * srpt_refresh_port() - Configure a HCA port. | |
475 | * | |
476 | * Enable InfiniBand management datagram processing, update the cached sm_lid, | |
477 | * lid and gid values, and register a callback function for processing MADs | |
478 | * on the specified port. | |
479 | * | |
480 | * Note: It is safe to call this function more than once for the same port. | |
481 | */ | |
482 | static int srpt_refresh_port(struct srpt_port *sport) | |
483 | { | |
484 | struct ib_mad_reg_req reg_req; | |
485 | struct ib_port_modify port_modify; | |
486 | struct ib_port_attr port_attr; | |
487 | int ret; | |
488 | ||
9d2aa2b4 | 489 | memset(&port_modify, 0, sizeof(port_modify)); |
a42d985b BVA |
490 | port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; |
491 | port_modify.clr_port_cap_mask = 0; | |
492 | ||
493 | ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
494 | if (ret) | |
495 | goto err_mod_port; | |
496 | ||
497 | ret = ib_query_port(sport->sdev->device, sport->port, &port_attr); | |
498 | if (ret) | |
499 | goto err_query_port; | |
500 | ||
501 | sport->sm_lid = port_attr.sm_lid; | |
502 | sport->lid = port_attr.lid; | |
503 | ||
55ee3ab2 MB |
504 | ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid, |
505 | NULL); | |
a42d985b BVA |
506 | if (ret) |
507 | goto err_query_port; | |
508 | ||
509 | if (!sport->mad_agent) { | |
9d2aa2b4 | 510 | memset(®_req, 0, sizeof(reg_req)); |
a42d985b BVA |
511 | reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT; |
512 | reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION; | |
513 | set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask); | |
514 | set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask); | |
515 | ||
516 | sport->mad_agent = ib_register_mad_agent(sport->sdev->device, | |
517 | sport->port, | |
518 | IB_QPT_GSI, | |
519 | ®_req, 0, | |
520 | srpt_mad_send_handler, | |
521 | srpt_mad_recv_handler, | |
0f29b46d | 522 | sport, 0); |
a42d985b BVA |
523 | if (IS_ERR(sport->mad_agent)) { |
524 | ret = PTR_ERR(sport->mad_agent); | |
525 | sport->mad_agent = NULL; | |
526 | goto err_query_port; | |
527 | } | |
528 | } | |
529 | ||
530 | return 0; | |
531 | ||
532 | err_query_port: | |
533 | ||
534 | port_modify.set_port_cap_mask = 0; | |
535 | port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; | |
536 | ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
537 | ||
538 | err_mod_port: | |
539 | ||
540 | return ret; | |
541 | } | |
542 | ||
543 | /** | |
544 | * srpt_unregister_mad_agent() - Unregister MAD callback functions. | |
545 | * | |
546 | * Note: It is safe to call this function more than once for the same device. | |
547 | */ | |
548 | static void srpt_unregister_mad_agent(struct srpt_device *sdev) | |
549 | { | |
550 | struct ib_port_modify port_modify = { | |
551 | .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP, | |
552 | }; | |
553 | struct srpt_port *sport; | |
554 | int i; | |
555 | ||
556 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
557 | sport = &sdev->port[i - 1]; | |
558 | WARN_ON(sport->port != i); | |
559 | if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0) | |
9f5d32af | 560 | pr_err("disabling MAD processing failed.\n"); |
a42d985b BVA |
561 | if (sport->mad_agent) { |
562 | ib_unregister_mad_agent(sport->mad_agent); | |
563 | sport->mad_agent = NULL; | |
564 | } | |
565 | } | |
566 | } | |
567 | ||
568 | /** | |
569 | * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure. | |
570 | */ | |
571 | static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev, | |
572 | int ioctx_size, int dma_size, | |
573 | enum dma_data_direction dir) | |
574 | { | |
575 | struct srpt_ioctx *ioctx; | |
576 | ||
577 | ioctx = kmalloc(ioctx_size, GFP_KERNEL); | |
578 | if (!ioctx) | |
579 | goto err; | |
580 | ||
581 | ioctx->buf = kmalloc(dma_size, GFP_KERNEL); | |
582 | if (!ioctx->buf) | |
583 | goto err_free_ioctx; | |
584 | ||
585 | ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir); | |
586 | if (ib_dma_mapping_error(sdev->device, ioctx->dma)) | |
587 | goto err_free_buf; | |
588 | ||
589 | return ioctx; | |
590 | ||
591 | err_free_buf: | |
592 | kfree(ioctx->buf); | |
593 | err_free_ioctx: | |
594 | kfree(ioctx); | |
595 | err: | |
596 | return NULL; | |
597 | } | |
598 | ||
599 | /** | |
600 | * srpt_free_ioctx() - Free an SRPT I/O context structure. | |
601 | */ | |
602 | static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx, | |
603 | int dma_size, enum dma_data_direction dir) | |
604 | { | |
605 | if (!ioctx) | |
606 | return; | |
607 | ||
608 | ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir); | |
609 | kfree(ioctx->buf); | |
610 | kfree(ioctx); | |
611 | } | |
612 | ||
613 | /** | |
614 | * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures. | |
615 | * @sdev: Device to allocate the I/O context ring for. | |
616 | * @ring_size: Number of elements in the I/O context ring. | |
617 | * @ioctx_size: I/O context size. | |
618 | * @dma_size: DMA buffer size. | |
619 | * @dir: DMA data direction. | |
620 | */ | |
621 | static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev, | |
622 | int ring_size, int ioctx_size, | |
623 | int dma_size, enum dma_data_direction dir) | |
624 | { | |
625 | struct srpt_ioctx **ring; | |
626 | int i; | |
627 | ||
628 | WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) | |
629 | && ioctx_size != sizeof(struct srpt_send_ioctx)); | |
630 | ||
631 | ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL); | |
632 | if (!ring) | |
633 | goto out; | |
634 | for (i = 0; i < ring_size; ++i) { | |
635 | ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir); | |
636 | if (!ring[i]) | |
637 | goto err; | |
638 | ring[i]->index = i; | |
639 | } | |
640 | goto out; | |
641 | ||
642 | err: | |
643 | while (--i >= 0) | |
644 | srpt_free_ioctx(sdev, ring[i], dma_size, dir); | |
645 | kfree(ring); | |
715252d4 | 646 | ring = NULL; |
a42d985b BVA |
647 | out: |
648 | return ring; | |
649 | } | |
650 | ||
651 | /** | |
652 | * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures. | |
653 | */ | |
654 | static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring, | |
655 | struct srpt_device *sdev, int ring_size, | |
656 | int dma_size, enum dma_data_direction dir) | |
657 | { | |
658 | int i; | |
659 | ||
660 | for (i = 0; i < ring_size; ++i) | |
661 | srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir); | |
662 | kfree(ioctx_ring); | |
663 | } | |
664 | ||
665 | /** | |
666 | * srpt_get_cmd_state() - Get the state of a SCSI command. | |
667 | */ | |
668 | static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx) | |
669 | { | |
670 | enum srpt_command_state state; | |
671 | unsigned long flags; | |
672 | ||
673 | BUG_ON(!ioctx); | |
674 | ||
675 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
676 | state = ioctx->state; | |
677 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
678 | return state; | |
679 | } | |
680 | ||
681 | /** | |
682 | * srpt_set_cmd_state() - Set the state of a SCSI command. | |
683 | * | |
684 | * Does not modify the state of aborted commands. Returns the previous command | |
685 | * state. | |
686 | */ | |
687 | static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
688 | enum srpt_command_state new) | |
689 | { | |
690 | enum srpt_command_state previous; | |
691 | unsigned long flags; | |
692 | ||
693 | BUG_ON(!ioctx); | |
694 | ||
695 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
696 | previous = ioctx->state; | |
697 | if (previous != SRPT_STATE_DONE) | |
698 | ioctx->state = new; | |
699 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
700 | ||
701 | return previous; | |
702 | } | |
703 | ||
704 | /** | |
705 | * srpt_test_and_set_cmd_state() - Test and set the state of a command. | |
706 | * | |
707 | * Returns true if and only if the previous command state was equal to 'old'. | |
708 | */ | |
709 | static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
710 | enum srpt_command_state old, | |
711 | enum srpt_command_state new) | |
712 | { | |
713 | enum srpt_command_state previous; | |
714 | unsigned long flags; | |
715 | ||
716 | WARN_ON(!ioctx); | |
717 | WARN_ON(old == SRPT_STATE_DONE); | |
718 | WARN_ON(new == SRPT_STATE_NEW); | |
719 | ||
720 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
721 | previous = ioctx->state; | |
722 | if (previous == old) | |
723 | ioctx->state = new; | |
724 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
725 | return previous == old; | |
726 | } | |
727 | ||
728 | /** | |
729 | * srpt_post_recv() - Post an IB receive request. | |
730 | */ | |
731 | static int srpt_post_recv(struct srpt_device *sdev, | |
732 | struct srpt_recv_ioctx *ioctx) | |
733 | { | |
734 | struct ib_sge list; | |
735 | struct ib_recv_wr wr, *bad_wr; | |
736 | ||
737 | BUG_ON(!sdev); | |
a42d985b BVA |
738 | list.addr = ioctx->ioctx.dma; |
739 | list.length = srp_max_req_size; | |
5a783956 | 740 | list.lkey = sdev->pd->local_dma_lkey; |
a42d985b | 741 | |
59fae4de CH |
742 | ioctx->ioctx.cqe.done = srpt_recv_done; |
743 | wr.wr_cqe = &ioctx->ioctx.cqe; | |
a42d985b BVA |
744 | wr.next = NULL; |
745 | wr.sg_list = &list; | |
746 | wr.num_sge = 1; | |
747 | ||
748 | return ib_post_srq_recv(sdev->srq, &wr, &bad_wr); | |
749 | } | |
750 | ||
751 | /** | |
752 | * srpt_post_send() - Post an IB send request. | |
753 | * | |
754 | * Returns zero upon success and a non-zero value upon failure. | |
755 | */ | |
756 | static int srpt_post_send(struct srpt_rdma_ch *ch, | |
757 | struct srpt_send_ioctx *ioctx, int len) | |
758 | { | |
759 | struct ib_sge list; | |
760 | struct ib_send_wr wr, *bad_wr; | |
761 | struct srpt_device *sdev = ch->sport->sdev; | |
762 | int ret; | |
763 | ||
764 | atomic_inc(&ch->req_lim); | |
765 | ||
766 | ret = -ENOMEM; | |
767 | if (unlikely(atomic_dec_return(&ch->sq_wr_avail) < 0)) { | |
9f5d32af | 768 | pr_warn("IB send queue full (needed 1)\n"); |
a42d985b BVA |
769 | goto out; |
770 | } | |
771 | ||
772 | ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len, | |
773 | DMA_TO_DEVICE); | |
774 | ||
775 | list.addr = ioctx->ioctx.dma; | |
776 | list.length = len; | |
5a783956 | 777 | list.lkey = sdev->pd->local_dma_lkey; |
a42d985b | 778 | |
59fae4de | 779 | ioctx->ioctx.cqe.done = srpt_send_done; |
a42d985b | 780 | wr.next = NULL; |
59fae4de | 781 | wr.wr_cqe = &ioctx->ioctx.cqe; |
a42d985b BVA |
782 | wr.sg_list = &list; |
783 | wr.num_sge = 1; | |
784 | wr.opcode = IB_WR_SEND; | |
785 | wr.send_flags = IB_SEND_SIGNALED; | |
786 | ||
787 | ret = ib_post_send(ch->qp, &wr, &bad_wr); | |
788 | ||
789 | out: | |
790 | if (ret < 0) { | |
791 | atomic_inc(&ch->sq_wr_avail); | |
792 | atomic_dec(&ch->req_lim); | |
793 | } | |
794 | return ret; | |
795 | } | |
796 | ||
797 | /** | |
798 | * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request. | |
799 | * @ioctx: Pointer to the I/O context associated with the request. | |
800 | * @srp_cmd: Pointer to the SRP_CMD request data. | |
801 | * @dir: Pointer to the variable to which the transfer direction will be | |
802 | * written. | |
803 | * @data_len: Pointer to the variable to which the total data length of all | |
804 | * descriptors in the SRP_CMD request will be written. | |
805 | * | |
806 | * This function initializes ioctx->nrbuf and ioctx->r_bufs. | |
807 | * | |
808 | * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors; | |
809 | * -ENOMEM when memory allocation fails and zero upon success. | |
810 | */ | |
811 | static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx, | |
812 | struct srp_cmd *srp_cmd, | |
813 | enum dma_data_direction *dir, u64 *data_len) | |
814 | { | |
815 | struct srp_indirect_buf *idb; | |
816 | struct srp_direct_buf *db; | |
817 | unsigned add_cdb_offset; | |
818 | int ret; | |
819 | ||
820 | /* | |
821 | * The pointer computations below will only be compiled correctly | |
822 | * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check | |
823 | * whether srp_cmd::add_data has been declared as a byte pointer. | |
824 | */ | |
825 | BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) | |
826 | && !__same_type(srp_cmd->add_data[0], (u8)0)); | |
827 | ||
828 | BUG_ON(!dir); | |
829 | BUG_ON(!data_len); | |
830 | ||
831 | ret = 0; | |
832 | *data_len = 0; | |
833 | ||
834 | /* | |
835 | * The lower four bits of the buffer format field contain the DATA-IN | |
836 | * buffer descriptor format, and the highest four bits contain the | |
837 | * DATA-OUT buffer descriptor format. | |
838 | */ | |
839 | *dir = DMA_NONE; | |
840 | if (srp_cmd->buf_fmt & 0xf) | |
841 | /* DATA-IN: transfer data from target to initiator (read). */ | |
842 | *dir = DMA_FROM_DEVICE; | |
843 | else if (srp_cmd->buf_fmt >> 4) | |
844 | /* DATA-OUT: transfer data from initiator to target (write). */ | |
845 | *dir = DMA_TO_DEVICE; | |
846 | ||
847 | /* | |
848 | * According to the SRP spec, the lower two bits of the 'ADDITIONAL | |
849 | * CDB LENGTH' field are reserved and the size in bytes of this field | |
850 | * is four times the value specified in bits 3..7. Hence the "& ~3". | |
851 | */ | |
852 | add_cdb_offset = srp_cmd->add_cdb_len & ~3; | |
853 | if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) || | |
854 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) { | |
855 | ioctx->n_rbuf = 1; | |
856 | ioctx->rbufs = &ioctx->single_rbuf; | |
857 | ||
858 | db = (struct srp_direct_buf *)(srp_cmd->add_data | |
859 | + add_cdb_offset); | |
9d2aa2b4 | 860 | memcpy(ioctx->rbufs, db, sizeof(*db)); |
a42d985b BVA |
861 | *data_len = be32_to_cpu(db->len); |
862 | } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) || | |
863 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) { | |
864 | idb = (struct srp_indirect_buf *)(srp_cmd->add_data | |
865 | + add_cdb_offset); | |
866 | ||
9d2aa2b4 | 867 | ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof(*db); |
a42d985b BVA |
868 | |
869 | if (ioctx->n_rbuf > | |
870 | (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) { | |
9f5d32af | 871 | pr_err("received unsupported SRP_CMD request" |
a42d985b BVA |
872 | " type (%u out + %u in != %u / %zu)\n", |
873 | srp_cmd->data_out_desc_cnt, | |
874 | srp_cmd->data_in_desc_cnt, | |
875 | be32_to_cpu(idb->table_desc.len), | |
876 | sizeof(*db)); | |
877 | ioctx->n_rbuf = 0; | |
878 | ret = -EINVAL; | |
879 | goto out; | |
880 | } | |
881 | ||
882 | if (ioctx->n_rbuf == 1) | |
883 | ioctx->rbufs = &ioctx->single_rbuf; | |
884 | else { | |
885 | ioctx->rbufs = | |
9d2aa2b4 | 886 | kmalloc(ioctx->n_rbuf * sizeof(*db), GFP_ATOMIC); |
a42d985b BVA |
887 | if (!ioctx->rbufs) { |
888 | ioctx->n_rbuf = 0; | |
889 | ret = -ENOMEM; | |
890 | goto out; | |
891 | } | |
892 | } | |
893 | ||
894 | db = idb->desc_list; | |
9d2aa2b4 | 895 | memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof(*db)); |
a42d985b BVA |
896 | *data_len = be32_to_cpu(idb->len); |
897 | } | |
898 | out: | |
899 | return ret; | |
900 | } | |
901 | ||
902 | /** | |
903 | * srpt_init_ch_qp() - Initialize queue pair attributes. | |
904 | * | |
905 | * Initialized the attributes of queue pair 'qp' by allowing local write, | |
906 | * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT. | |
907 | */ | |
908 | static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
909 | { | |
910 | struct ib_qp_attr *attr; | |
911 | int ret; | |
912 | ||
9d2aa2b4 | 913 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
a42d985b BVA |
914 | if (!attr) |
915 | return -ENOMEM; | |
916 | ||
917 | attr->qp_state = IB_QPS_INIT; | |
918 | attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ | | |
919 | IB_ACCESS_REMOTE_WRITE; | |
920 | attr->port_num = ch->sport->port; | |
921 | attr->pkey_index = 0; | |
922 | ||
923 | ret = ib_modify_qp(qp, attr, | |
924 | IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT | | |
925 | IB_QP_PKEY_INDEX); | |
926 | ||
927 | kfree(attr); | |
928 | return ret; | |
929 | } | |
930 | ||
931 | /** | |
932 | * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR). | |
933 | * @ch: channel of the queue pair. | |
934 | * @qp: queue pair to change the state of. | |
935 | * | |
936 | * Returns zero upon success and a negative value upon failure. | |
937 | * | |
938 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
939 | * If this structure ever becomes larger, it might be necessary to allocate | |
940 | * it dynamically instead of on the stack. | |
941 | */ | |
942 | static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
943 | { | |
944 | struct ib_qp_attr qp_attr; | |
945 | int attr_mask; | |
946 | int ret; | |
947 | ||
948 | qp_attr.qp_state = IB_QPS_RTR; | |
949 | ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask); | |
950 | if (ret) | |
951 | goto out; | |
952 | ||
953 | qp_attr.max_dest_rd_atomic = 4; | |
954 | ||
955 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
956 | ||
957 | out: | |
958 | return ret; | |
959 | } | |
960 | ||
961 | /** | |
962 | * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS). | |
963 | * @ch: channel of the queue pair. | |
964 | * @qp: queue pair to change the state of. | |
965 | * | |
966 | * Returns zero upon success and a negative value upon failure. | |
967 | * | |
968 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
969 | * If this structure ever becomes larger, it might be necessary to allocate | |
970 | * it dynamically instead of on the stack. | |
971 | */ | |
972 | static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
973 | { | |
974 | struct ib_qp_attr qp_attr; | |
975 | int attr_mask; | |
976 | int ret; | |
977 | ||
978 | qp_attr.qp_state = IB_QPS_RTS; | |
979 | ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask); | |
980 | if (ret) | |
981 | goto out; | |
982 | ||
983 | qp_attr.max_rd_atomic = 4; | |
984 | ||
985 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
986 | ||
987 | out: | |
988 | return ret; | |
989 | } | |
990 | ||
991 | /** | |
992 | * srpt_ch_qp_err() - Set the channel queue pair state to 'error'. | |
993 | */ | |
994 | static int srpt_ch_qp_err(struct srpt_rdma_ch *ch) | |
995 | { | |
996 | struct ib_qp_attr qp_attr; | |
997 | ||
998 | qp_attr.qp_state = IB_QPS_ERR; | |
999 | return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE); | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list. | |
1004 | */ | |
1005 | static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch, | |
1006 | struct srpt_send_ioctx *ioctx) | |
1007 | { | |
1008 | struct scatterlist *sg; | |
1009 | enum dma_data_direction dir; | |
1010 | ||
1011 | BUG_ON(!ch); | |
1012 | BUG_ON(!ioctx); | |
59fae4de | 1013 | BUG_ON(ioctx->n_rdma && !ioctx->rdma_wrs); |
a42d985b BVA |
1014 | |
1015 | while (ioctx->n_rdma) | |
59fae4de | 1016 | kfree(ioctx->rdma_wrs[--ioctx->n_rdma].wr.sg_list); |
a42d985b | 1017 | |
59fae4de CH |
1018 | kfree(ioctx->rdma_wrs); |
1019 | ioctx->rdma_wrs = NULL; | |
a42d985b BVA |
1020 | |
1021 | if (ioctx->mapped_sg_count) { | |
1022 | sg = ioctx->sg; | |
1023 | WARN_ON(!sg); | |
1024 | dir = ioctx->cmd.data_direction; | |
1025 | BUG_ON(dir == DMA_NONE); | |
1026 | ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt, | |
671ec1b2 | 1027 | target_reverse_dma_direction(&ioctx->cmd)); |
a42d985b BVA |
1028 | ioctx->mapped_sg_count = 0; |
1029 | } | |
1030 | } | |
1031 | ||
1032 | /** | |
1033 | * srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list. | |
1034 | */ | |
1035 | static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch, | |
1036 | struct srpt_send_ioctx *ioctx) | |
1037 | { | |
b0768080 | 1038 | struct ib_device *dev = ch->sport->sdev->device; |
a42d985b BVA |
1039 | struct se_cmd *cmd; |
1040 | struct scatterlist *sg, *sg_orig; | |
1041 | int sg_cnt; | |
1042 | enum dma_data_direction dir; | |
59fae4de | 1043 | struct ib_rdma_wr *riu; |
a42d985b BVA |
1044 | struct srp_direct_buf *db; |
1045 | dma_addr_t dma_addr; | |
1046 | struct ib_sge *sge; | |
1047 | u64 raddr; | |
1048 | u32 rsize; | |
1049 | u32 tsize; | |
1050 | u32 dma_len; | |
1051 | int count, nrdma; | |
1052 | int i, j, k; | |
1053 | ||
1054 | BUG_ON(!ch); | |
1055 | BUG_ON(!ioctx); | |
1056 | cmd = &ioctx->cmd; | |
1057 | dir = cmd->data_direction; | |
1058 | BUG_ON(dir == DMA_NONE); | |
1059 | ||
6f9e7f01 RD |
1060 | ioctx->sg = sg = sg_orig = cmd->t_data_sg; |
1061 | ioctx->sg_cnt = sg_cnt = cmd->t_data_nents; | |
a42d985b BVA |
1062 | |
1063 | count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt, | |
671ec1b2 | 1064 | target_reverse_dma_direction(cmd)); |
a42d985b BVA |
1065 | if (unlikely(!count)) |
1066 | return -EAGAIN; | |
1067 | ||
1068 | ioctx->mapped_sg_count = count; | |
1069 | ||
59fae4de CH |
1070 | if (ioctx->rdma_wrs && ioctx->n_rdma_wrs) |
1071 | nrdma = ioctx->n_rdma_wrs; | |
a42d985b BVA |
1072 | else { |
1073 | nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE | |
1074 | + ioctx->n_rbuf; | |
1075 | ||
59fae4de CH |
1076 | ioctx->rdma_wrs = kcalloc(nrdma, sizeof(*ioctx->rdma_wrs), |
1077 | GFP_KERNEL); | |
1078 | if (!ioctx->rdma_wrs) | |
a42d985b BVA |
1079 | goto free_mem; |
1080 | ||
59fae4de | 1081 | ioctx->n_rdma_wrs = nrdma; |
a42d985b BVA |
1082 | } |
1083 | ||
1084 | db = ioctx->rbufs; | |
1085 | tsize = cmd->data_length; | |
b0768080 | 1086 | dma_len = ib_sg_dma_len(dev, &sg[0]); |
59fae4de | 1087 | riu = ioctx->rdma_wrs; |
a42d985b BVA |
1088 | |
1089 | /* | |
1090 | * For each remote desc - calculate the #ib_sge. | |
1091 | * If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then | |
1092 | * each remote desc rdma_iu is required a rdma wr; | |
1093 | * else | |
1094 | * we need to allocate extra rdma_iu to carry extra #ib_sge in | |
1095 | * another rdma wr | |
1096 | */ | |
1097 | for (i = 0, j = 0; | |
1098 | j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) { | |
1099 | rsize = be32_to_cpu(db->len); | |
1100 | raddr = be64_to_cpu(db->va); | |
59fae4de | 1101 | riu->remote_addr = raddr; |
a42d985b | 1102 | riu->rkey = be32_to_cpu(db->key); |
59fae4de | 1103 | riu->wr.num_sge = 0; |
a42d985b BVA |
1104 | |
1105 | /* calculate how many sge required for this remote_buf */ | |
1106 | while (rsize > 0 && tsize > 0) { | |
1107 | ||
1108 | if (rsize >= dma_len) { | |
1109 | tsize -= dma_len; | |
1110 | rsize -= dma_len; | |
1111 | raddr += dma_len; | |
1112 | ||
1113 | if (tsize > 0) { | |
1114 | ++j; | |
1115 | if (j < count) { | |
1116 | sg = sg_next(sg); | |
b0768080 MM |
1117 | dma_len = ib_sg_dma_len( |
1118 | dev, sg); | |
a42d985b BVA |
1119 | } |
1120 | } | |
1121 | } else { | |
1122 | tsize -= rsize; | |
1123 | dma_len -= rsize; | |
1124 | rsize = 0; | |
1125 | } | |
1126 | ||
59fae4de | 1127 | ++riu->wr.num_sge; |
a42d985b | 1128 | |
59fae4de CH |
1129 | if (rsize > 0 && |
1130 | riu->wr.num_sge == SRPT_DEF_SG_PER_WQE) { | |
a42d985b | 1131 | ++ioctx->n_rdma; |
59fae4de CH |
1132 | riu->wr.sg_list = kmalloc_array(riu->wr.num_sge, |
1133 | sizeof(*riu->wr.sg_list), | |
1134 | GFP_KERNEL); | |
1135 | if (!riu->wr.sg_list) | |
a42d985b BVA |
1136 | goto free_mem; |
1137 | ||
1138 | ++riu; | |
59fae4de CH |
1139 | riu->wr.num_sge = 0; |
1140 | riu->remote_addr = raddr; | |
a42d985b BVA |
1141 | riu->rkey = be32_to_cpu(db->key); |
1142 | } | |
1143 | } | |
1144 | ||
1145 | ++ioctx->n_rdma; | |
59fae4de CH |
1146 | riu->wr.sg_list = kmalloc_array(riu->wr.num_sge, |
1147 | sizeof(*riu->wr.sg_list), | |
1148 | GFP_KERNEL); | |
1149 | if (!riu->wr.sg_list) | |
a42d985b BVA |
1150 | goto free_mem; |
1151 | } | |
1152 | ||
1153 | db = ioctx->rbufs; | |
1154 | tsize = cmd->data_length; | |
59fae4de | 1155 | riu = ioctx->rdma_wrs; |
a42d985b | 1156 | sg = sg_orig; |
b0768080 MM |
1157 | dma_len = ib_sg_dma_len(dev, &sg[0]); |
1158 | dma_addr = ib_sg_dma_address(dev, &sg[0]); | |
a42d985b BVA |
1159 | |
1160 | /* this second loop is really mapped sg_addres to rdma_iu->ib_sge */ | |
1161 | for (i = 0, j = 0; | |
1162 | j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) { | |
1163 | rsize = be32_to_cpu(db->len); | |
59fae4de | 1164 | sge = riu->wr.sg_list; |
a42d985b BVA |
1165 | k = 0; |
1166 | ||
1167 | while (rsize > 0 && tsize > 0) { | |
1168 | sge->addr = dma_addr; | |
5a783956 | 1169 | sge->lkey = ch->sport->sdev->pd->local_dma_lkey; |
a42d985b BVA |
1170 | |
1171 | if (rsize >= dma_len) { | |
1172 | sge->length = | |
1173 | (tsize < dma_len) ? tsize : dma_len; | |
1174 | tsize -= dma_len; | |
1175 | rsize -= dma_len; | |
1176 | ||
1177 | if (tsize > 0) { | |
1178 | ++j; | |
1179 | if (j < count) { | |
1180 | sg = sg_next(sg); | |
b0768080 MM |
1181 | dma_len = ib_sg_dma_len( |
1182 | dev, sg); | |
1183 | dma_addr = ib_sg_dma_address( | |
1184 | dev, sg); | |
a42d985b BVA |
1185 | } |
1186 | } | |
1187 | } else { | |
1188 | sge->length = (tsize < rsize) ? tsize : rsize; | |
1189 | tsize -= rsize; | |
1190 | dma_len -= rsize; | |
1191 | dma_addr += rsize; | |
1192 | rsize = 0; | |
1193 | } | |
1194 | ||
1195 | ++k; | |
59fae4de | 1196 | if (k == riu->wr.num_sge && rsize > 0 && tsize > 0) { |
a42d985b | 1197 | ++riu; |
59fae4de | 1198 | sge = riu->wr.sg_list; |
a42d985b BVA |
1199 | k = 0; |
1200 | } else if (rsize > 0 && tsize > 0) | |
1201 | ++sge; | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | return 0; | |
1206 | ||
1207 | free_mem: | |
1208 | srpt_unmap_sg_to_ib_sge(ch, ioctx); | |
1209 | ||
1210 | return -ENOMEM; | |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator. | |
1215 | */ | |
1216 | static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch) | |
1217 | { | |
1218 | struct srpt_send_ioctx *ioctx; | |
1219 | unsigned long flags; | |
1220 | ||
1221 | BUG_ON(!ch); | |
1222 | ||
1223 | ioctx = NULL; | |
1224 | spin_lock_irqsave(&ch->spinlock, flags); | |
1225 | if (!list_empty(&ch->free_list)) { | |
1226 | ioctx = list_first_entry(&ch->free_list, | |
1227 | struct srpt_send_ioctx, free_list); | |
1228 | list_del(&ioctx->free_list); | |
1229 | } | |
1230 | spin_unlock_irqrestore(&ch->spinlock, flags); | |
1231 | ||
1232 | if (!ioctx) | |
1233 | return ioctx; | |
1234 | ||
1235 | BUG_ON(ioctx->ch != ch); | |
a42d985b BVA |
1236 | spin_lock_init(&ioctx->spinlock); |
1237 | ioctx->state = SRPT_STATE_NEW; | |
1238 | ioctx->n_rbuf = 0; | |
1239 | ioctx->rbufs = NULL; | |
1240 | ioctx->n_rdma = 0; | |
59fae4de CH |
1241 | ioctx->n_rdma_wrs = 0; |
1242 | ioctx->rdma_wrs = NULL; | |
a42d985b BVA |
1243 | ioctx->mapped_sg_count = 0; |
1244 | init_completion(&ioctx->tx_done); | |
1245 | ioctx->queue_status_only = false; | |
1246 | /* | |
1247 | * transport_init_se_cmd() does not initialize all fields, so do it | |
1248 | * here. | |
1249 | */ | |
1250 | memset(&ioctx->cmd, 0, sizeof(ioctx->cmd)); | |
1251 | memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data)); | |
1252 | ||
1253 | return ioctx; | |
1254 | } | |
1255 | ||
a42d985b BVA |
1256 | /** |
1257 | * srpt_abort_cmd() - Abort a SCSI command. | |
1258 | * @ioctx: I/O context associated with the SCSI command. | |
1259 | * @context: Preferred execution context. | |
1260 | */ | |
1261 | static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx) | |
1262 | { | |
1263 | enum srpt_command_state state; | |
1264 | unsigned long flags; | |
1265 | ||
1266 | BUG_ON(!ioctx); | |
1267 | ||
1268 | /* | |
1269 | * If the command is in a state where the target core is waiting for | |
49f40163 | 1270 | * the ib_srpt driver, change the state to the next state. |
a42d985b BVA |
1271 | */ |
1272 | ||
1273 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
1274 | state = ioctx->state; | |
1275 | switch (state) { | |
1276 | case SRPT_STATE_NEED_DATA: | |
1277 | ioctx->state = SRPT_STATE_DATA_IN; | |
1278 | break; | |
a42d985b BVA |
1279 | case SRPT_STATE_CMD_RSP_SENT: |
1280 | case SRPT_STATE_MGMT_RSP_SENT: | |
1281 | ioctx->state = SRPT_STATE_DONE; | |
1282 | break; | |
1283 | default: | |
49f40163 BVA |
1284 | WARN_ONCE(true, "%s: unexpected I/O context state %d\n", |
1285 | __func__, state); | |
a42d985b BVA |
1286 | break; |
1287 | } | |
1288 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
1289 | ||
a42d985b | 1290 | pr_debug("Aborting cmd with state %d and tag %lld\n", state, |
649ee054 | 1291 | ioctx->cmd.tag); |
a42d985b BVA |
1292 | |
1293 | switch (state) { | |
1294 | case SRPT_STATE_NEW: | |
1295 | case SRPT_STATE_DATA_IN: | |
1296 | case SRPT_STATE_MGMT: | |
49f40163 | 1297 | case SRPT_STATE_DONE: |
a42d985b BVA |
1298 | /* |
1299 | * Do nothing - defer abort processing until | |
1300 | * srpt_queue_response() is invoked. | |
1301 | */ | |
a42d985b BVA |
1302 | break; |
1303 | case SRPT_STATE_NEED_DATA: | |
49f40163 BVA |
1304 | pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag); |
1305 | transport_generic_request_failure(&ioctx->cmd, | |
1306 | TCM_CHECK_CONDITION_ABORT_CMD); | |
a42d985b BVA |
1307 | break; |
1308 | case SRPT_STATE_CMD_RSP_SENT: | |
1309 | /* | |
1310 | * SRP_RSP sending failed or the SRP_RSP send completion has | |
1311 | * not been received in time. | |
1312 | */ | |
1313 | srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx); | |
49f40163 | 1314 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1315 | break; |
1316 | case SRPT_STATE_MGMT_RSP_SENT: | |
49f40163 | 1317 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1318 | break; |
1319 | default: | |
532ec6f1 | 1320 | WARN(1, "Unexpected command state (%d)", state); |
a42d985b BVA |
1321 | break; |
1322 | } | |
1323 | ||
a42d985b BVA |
1324 | return state; |
1325 | } | |
1326 | ||
1327 | /** | |
e672a47f CH |
1328 | * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping |
1329 | * the data that has been transferred via IB RDMA had to be postponed until the | |
142ad5db | 1330 | * check_stop_free() callback. None of this is necessary anymore and needs to |
e672a47f | 1331 | * be cleaned up. |
a42d985b | 1332 | */ |
59fae4de | 1333 | static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1334 | { |
59fae4de CH |
1335 | struct srpt_rdma_ch *ch = cq->cq_context; |
1336 | struct srpt_send_ioctx *ioctx = | |
19f57298 | 1337 | container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe); |
59fae4de | 1338 | |
a42d985b BVA |
1339 | WARN_ON(ioctx->n_rdma <= 0); |
1340 | atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); | |
1341 | ||
59fae4de CH |
1342 | if (unlikely(wc->status != IB_WC_SUCCESS)) { |
1343 | pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n", | |
1344 | ioctx, wc->status); | |
1345 | srpt_abort_cmd(ioctx); | |
1346 | return; | |
a42d985b | 1347 | } |
59fae4de CH |
1348 | |
1349 | if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, | |
1350 | SRPT_STATE_DATA_IN)) | |
1351 | target_execute_cmd(&ioctx->cmd); | |
1352 | else | |
1353 | pr_err("%s[%d]: wrong state = %d\n", __func__, | |
1354 | __LINE__, srpt_get_cmd_state(ioctx)); | |
a42d985b BVA |
1355 | } |
1356 | ||
59fae4de | 1357 | static void srpt_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1358 | { |
59fae4de | 1359 | struct srpt_send_ioctx *ioctx = |
19f57298 | 1360 | container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe); |
a42d985b | 1361 | |
59fae4de | 1362 | if (unlikely(wc->status != IB_WC_SUCCESS)) { |
49f40163 BVA |
1363 | /* |
1364 | * Note: if an RDMA write error completion is received that | |
1365 | * means that a SEND also has been posted. Defer further | |
1366 | * processing of the associated command until the send error | |
1367 | * completion has been received. | |
1368 | */ | |
59fae4de CH |
1369 | pr_info("RDMA_WRITE for ioctx 0x%p failed with status %d\n", |
1370 | ioctx, wc->status); | |
a42d985b BVA |
1371 | } |
1372 | } | |
1373 | ||
1374 | /** | |
1375 | * srpt_build_cmd_rsp() - Build an SRP_RSP response. | |
1376 | * @ch: RDMA channel through which the request has been received. | |
1377 | * @ioctx: I/O context associated with the SRP_CMD request. The response will | |
1378 | * be built in the buffer ioctx->buf points at and hence this function will | |
1379 | * overwrite the request data. | |
1380 | * @tag: tag of the request for which this response is being generated. | |
1381 | * @status: value for the STATUS field of the SRP_RSP information unit. | |
1382 | * | |
1383 | * Returns the size in bytes of the SRP_RSP response. | |
1384 | * | |
1385 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1386 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1387 | * response. See also SPC-2 for more information about sense data. | |
1388 | */ | |
1389 | static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch, | |
1390 | struct srpt_send_ioctx *ioctx, u64 tag, | |
1391 | int status) | |
1392 | { | |
1393 | struct srp_rsp *srp_rsp; | |
1394 | const u8 *sense_data; | |
1395 | int sense_data_len, max_sense_len; | |
1396 | ||
1397 | /* | |
1398 | * The lowest bit of all SAM-3 status codes is zero (see also | |
1399 | * paragraph 5.3 in SAM-3). | |
1400 | */ | |
1401 | WARN_ON(status & 1); | |
1402 | ||
1403 | srp_rsp = ioctx->ioctx.buf; | |
1404 | BUG_ON(!srp_rsp); | |
1405 | ||
1406 | sense_data = ioctx->sense_data; | |
1407 | sense_data_len = ioctx->cmd.scsi_sense_length; | |
1408 | WARN_ON(sense_data_len > sizeof(ioctx->sense_data)); | |
1409 | ||
9d2aa2b4 | 1410 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1411 | srp_rsp->opcode = SRP_RSP; |
1412 | srp_rsp->req_lim_delta = | |
b356c1c1 | 1413 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); |
a42d985b BVA |
1414 | srp_rsp->tag = tag; |
1415 | srp_rsp->status = status; | |
1416 | ||
1417 | if (sense_data_len) { | |
1418 | BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp)); | |
1419 | max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp); | |
1420 | if (sense_data_len > max_sense_len) { | |
9f5d32af DL |
1421 | pr_warn("truncated sense data from %d to %d" |
1422 | " bytes\n", sense_data_len, max_sense_len); | |
a42d985b BVA |
1423 | sense_data_len = max_sense_len; |
1424 | } | |
1425 | ||
1426 | srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
1427 | srp_rsp->sense_data_len = cpu_to_be32(sense_data_len); | |
1428 | memcpy(srp_rsp + 1, sense_data, sense_data_len); | |
1429 | } | |
1430 | ||
1431 | return sizeof(*srp_rsp) + sense_data_len; | |
1432 | } | |
1433 | ||
1434 | /** | |
1435 | * srpt_build_tskmgmt_rsp() - Build a task management response. | |
1436 | * @ch: RDMA channel through which the request has been received. | |
1437 | * @ioctx: I/O context in which the SRP_RSP response will be built. | |
1438 | * @rsp_code: RSP_CODE that will be stored in the response. | |
1439 | * @tag: Tag of the request for which this response is being generated. | |
1440 | * | |
1441 | * Returns the size in bytes of the SRP_RSP response. | |
1442 | * | |
1443 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1444 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1445 | * response. | |
1446 | */ | |
1447 | static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch, | |
1448 | struct srpt_send_ioctx *ioctx, | |
1449 | u8 rsp_code, u64 tag) | |
1450 | { | |
1451 | struct srp_rsp *srp_rsp; | |
1452 | int resp_data_len; | |
1453 | int resp_len; | |
1454 | ||
c807f643 | 1455 | resp_data_len = 4; |
a42d985b BVA |
1456 | resp_len = sizeof(*srp_rsp) + resp_data_len; |
1457 | ||
1458 | srp_rsp = ioctx->ioctx.buf; | |
1459 | BUG_ON(!srp_rsp); | |
9d2aa2b4 | 1460 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1461 | |
1462 | srp_rsp->opcode = SRP_RSP; | |
b356c1c1 VT |
1463 | srp_rsp->req_lim_delta = |
1464 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); | |
a42d985b BVA |
1465 | srp_rsp->tag = tag; |
1466 | ||
c807f643 JW |
1467 | srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID; |
1468 | srp_rsp->resp_data_len = cpu_to_be32(resp_data_len); | |
1469 | srp_rsp->data[3] = rsp_code; | |
a42d985b BVA |
1470 | |
1471 | return resp_len; | |
1472 | } | |
1473 | ||
a42d985b BVA |
1474 | static int srpt_check_stop_free(struct se_cmd *cmd) |
1475 | { | |
9474b043 NB |
1476 | struct srpt_send_ioctx *ioctx = container_of(cmd, |
1477 | struct srpt_send_ioctx, cmd); | |
a42d985b | 1478 | |
afc16604 | 1479 | return target_put_sess_cmd(&ioctx->cmd); |
a42d985b BVA |
1480 | } |
1481 | ||
1482 | /** | |
1483 | * srpt_handle_cmd() - Process SRP_CMD. | |
1484 | */ | |
2c7f37ff BVA |
1485 | static void srpt_handle_cmd(struct srpt_rdma_ch *ch, |
1486 | struct srpt_recv_ioctx *recv_ioctx, | |
1487 | struct srpt_send_ioctx *send_ioctx) | |
a42d985b BVA |
1488 | { |
1489 | struct se_cmd *cmd; | |
1490 | struct srp_cmd *srp_cmd; | |
a42d985b BVA |
1491 | u64 data_len; |
1492 | enum dma_data_direction dir; | |
9474b043 | 1493 | int rc; |
a42d985b BVA |
1494 | |
1495 | BUG_ON(!send_ioctx); | |
1496 | ||
1497 | srp_cmd = recv_ioctx->ioctx.buf; | |
a42d985b | 1498 | cmd = &send_ioctx->cmd; |
649ee054 | 1499 | cmd->tag = srp_cmd->tag; |
a42d985b BVA |
1500 | |
1501 | switch (srp_cmd->task_attr) { | |
1502 | case SRP_CMD_SIMPLE_Q: | |
68d81f40 | 1503 | cmd->sam_task_attr = TCM_SIMPLE_TAG; |
a42d985b BVA |
1504 | break; |
1505 | case SRP_CMD_ORDERED_Q: | |
1506 | default: | |
68d81f40 | 1507 | cmd->sam_task_attr = TCM_ORDERED_TAG; |
a42d985b BVA |
1508 | break; |
1509 | case SRP_CMD_HEAD_OF_Q: | |
68d81f40 | 1510 | cmd->sam_task_attr = TCM_HEAD_TAG; |
a42d985b BVA |
1511 | break; |
1512 | case SRP_CMD_ACA: | |
68d81f40 | 1513 | cmd->sam_task_attr = TCM_ACA_TAG; |
a42d985b BVA |
1514 | break; |
1515 | } | |
1516 | ||
de103c93 | 1517 | if (srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len)) { |
9f5d32af | 1518 | pr_err("0x%llx: parsing SRP descriptor table failed.\n", |
a42d985b | 1519 | srp_cmd->tag); |
2c7f37ff | 1520 | goto release_ioctx; |
a42d985b BVA |
1521 | } |
1522 | ||
9474b043 | 1523 | rc = target_submit_cmd(cmd, ch->sess, srp_cmd->cdb, |
e1dd413c BVA |
1524 | &send_ioctx->sense_data[0], |
1525 | scsilun_to_int(&srp_cmd->lun), data_len, | |
1526 | TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF); | |
9474b043 | 1527 | if (rc != 0) { |
2c7f37ff BVA |
1528 | pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc, |
1529 | srp_cmd->tag); | |
1530 | goto release_ioctx; | |
187e70a5 | 1531 | } |
2c7f37ff | 1532 | return; |
a42d985b | 1533 | |
2c7f37ff BVA |
1534 | release_ioctx: |
1535 | send_ioctx->state = SRPT_STATE_DONE; | |
1536 | srpt_release_cmd(cmd); | |
a42d985b BVA |
1537 | } |
1538 | ||
a42d985b BVA |
1539 | static int srp_tmr_to_tcm(int fn) |
1540 | { | |
1541 | switch (fn) { | |
1542 | case SRP_TSK_ABORT_TASK: | |
1543 | return TMR_ABORT_TASK; | |
1544 | case SRP_TSK_ABORT_TASK_SET: | |
1545 | return TMR_ABORT_TASK_SET; | |
1546 | case SRP_TSK_CLEAR_TASK_SET: | |
1547 | return TMR_CLEAR_TASK_SET; | |
1548 | case SRP_TSK_LUN_RESET: | |
1549 | return TMR_LUN_RESET; | |
1550 | case SRP_TSK_CLEAR_ACA: | |
1551 | return TMR_CLEAR_ACA; | |
1552 | default: | |
1553 | return -1; | |
1554 | } | |
1555 | } | |
1556 | ||
1557 | /** | |
1558 | * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit. | |
1559 | * | |
1560 | * Returns 0 if and only if the request will be processed by the target core. | |
1561 | * | |
1562 | * For more information about SRP_TSK_MGMT information units, see also section | |
1563 | * 6.7 in the SRP r16a document. | |
1564 | */ | |
1565 | static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch, | |
1566 | struct srpt_recv_ioctx *recv_ioctx, | |
1567 | struct srpt_send_ioctx *send_ioctx) | |
1568 | { | |
1569 | struct srp_tsk_mgmt *srp_tsk; | |
1570 | struct se_cmd *cmd; | |
3e4f5748 | 1571 | struct se_session *sess = ch->sess; |
a42d985b | 1572 | int tcm_tmr; |
3e4f5748 | 1573 | int rc; |
a42d985b BVA |
1574 | |
1575 | BUG_ON(!send_ioctx); | |
1576 | ||
1577 | srp_tsk = recv_ioctx->ioctx.buf; | |
1578 | cmd = &send_ioctx->cmd; | |
1579 | ||
1580 | pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld" | |
1581 | " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func, | |
1582 | srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess); | |
1583 | ||
1584 | srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT); | |
649ee054 | 1585 | send_ioctx->cmd.tag = srp_tsk->tag; |
a42d985b | 1586 | tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func); |
e1dd413c BVA |
1587 | rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, |
1588 | scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr, | |
1589 | GFP_KERNEL, srp_tsk->task_tag, | |
1590 | TARGET_SCF_ACK_KREF); | |
3e4f5748 NB |
1591 | if (rc != 0) { |
1592 | send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED; | |
de103c93 | 1593 | goto fail; |
a42d985b | 1594 | } |
de103c93 CH |
1595 | return; |
1596 | fail: | |
de103c93 | 1597 | transport_send_check_condition_and_sense(cmd, 0, 0); // XXX: |
a42d985b BVA |
1598 | } |
1599 | ||
1600 | /** | |
1601 | * srpt_handle_new_iu() - Process a newly received information unit. | |
1602 | * @ch: RDMA channel through which the information unit has been received. | |
1603 | * @ioctx: SRPT I/O context associated with the information unit. | |
1604 | */ | |
1605 | static void srpt_handle_new_iu(struct srpt_rdma_ch *ch, | |
1606 | struct srpt_recv_ioctx *recv_ioctx, | |
1607 | struct srpt_send_ioctx *send_ioctx) | |
1608 | { | |
1609 | struct srp_cmd *srp_cmd; | |
a42d985b BVA |
1610 | |
1611 | BUG_ON(!ch); | |
1612 | BUG_ON(!recv_ioctx); | |
1613 | ||
1614 | ib_dma_sync_single_for_cpu(ch->sport->sdev->device, | |
1615 | recv_ioctx->ioctx.dma, srp_max_req_size, | |
1616 | DMA_FROM_DEVICE); | |
1617 | ||
33912d73 | 1618 | if (unlikely(ch->state == CH_CONNECTING)) { |
a42d985b BVA |
1619 | list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list); |
1620 | goto out; | |
1621 | } | |
1622 | ||
33912d73 | 1623 | if (unlikely(ch->state != CH_LIVE)) |
a42d985b BVA |
1624 | goto out; |
1625 | ||
1626 | srp_cmd = recv_ioctx->ioctx.buf; | |
1627 | if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) { | |
1628 | if (!send_ioctx) | |
1629 | send_ioctx = srpt_get_send_ioctx(ch); | |
1630 | if (unlikely(!send_ioctx)) { | |
1631 | list_add_tail(&recv_ioctx->wait_list, | |
1632 | &ch->cmd_wait_list); | |
1633 | goto out; | |
1634 | } | |
1635 | } | |
1636 | ||
a42d985b BVA |
1637 | switch (srp_cmd->opcode) { |
1638 | case SRP_CMD: | |
1639 | srpt_handle_cmd(ch, recv_ioctx, send_ioctx); | |
1640 | break; | |
1641 | case SRP_TSK_MGMT: | |
1642 | srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx); | |
1643 | break; | |
1644 | case SRP_I_LOGOUT: | |
9f5d32af | 1645 | pr_err("Not yet implemented: SRP_I_LOGOUT\n"); |
a42d985b BVA |
1646 | break; |
1647 | case SRP_CRED_RSP: | |
1648 | pr_debug("received SRP_CRED_RSP\n"); | |
1649 | break; | |
1650 | case SRP_AER_RSP: | |
1651 | pr_debug("received SRP_AER_RSP\n"); | |
1652 | break; | |
1653 | case SRP_RSP: | |
9f5d32af | 1654 | pr_err("Received SRP_RSP\n"); |
a42d985b BVA |
1655 | break; |
1656 | default: | |
9f5d32af | 1657 | pr_err("received IU with unknown opcode 0x%x\n", |
a42d985b BVA |
1658 | srp_cmd->opcode); |
1659 | break; | |
1660 | } | |
1661 | ||
1662 | srpt_post_recv(ch->sport->sdev, recv_ioctx); | |
1663 | out: | |
1664 | return; | |
1665 | } | |
1666 | ||
59fae4de | 1667 | static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1668 | { |
59fae4de CH |
1669 | struct srpt_rdma_ch *ch = cq->cq_context; |
1670 | struct srpt_recv_ioctx *ioctx = | |
1671 | container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe); | |
a42d985b | 1672 | |
a42d985b BVA |
1673 | if (wc->status == IB_WC_SUCCESS) { |
1674 | int req_lim; | |
1675 | ||
1676 | req_lim = atomic_dec_return(&ch->req_lim); | |
1677 | if (unlikely(req_lim < 0)) | |
9f5d32af | 1678 | pr_err("req_lim = %d < 0\n", req_lim); |
a42d985b BVA |
1679 | srpt_handle_new_iu(ch, ioctx, NULL); |
1680 | } else { | |
59fae4de CH |
1681 | pr_info("receiving failed for ioctx %p with status %d\n", |
1682 | ioctx, wc->status); | |
a42d985b BVA |
1683 | } |
1684 | } | |
1685 | ||
1686 | /** | |
a42d985b BVA |
1687 | * Note: Although this has not yet been observed during tests, at least in |
1688 | * theory it is possible that the srpt_get_send_ioctx() call invoked by | |
1689 | * srpt_handle_new_iu() fails. This is possible because the req_lim_delta | |
1690 | * value in each response is set to one, and it is possible that this response | |
1691 | * makes the initiator send a new request before the send completion for that | |
1692 | * response has been processed. This could e.g. happen if the call to | |
1693 | * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or | |
1694 | * if IB retransmission causes generation of the send completion to be | |
1695 | * delayed. Incoming information units for which srpt_get_send_ioctx() fails | |
1696 | * are queued on cmd_wait_list. The code below processes these delayed | |
1697 | * requests one at a time. | |
1698 | */ | |
59fae4de | 1699 | static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1700 | { |
59fae4de CH |
1701 | struct srpt_rdma_ch *ch = cq->cq_context; |
1702 | struct srpt_send_ioctx *ioctx = | |
1703 | container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe); | |
1704 | enum srpt_command_state state; | |
a42d985b | 1705 | |
59fae4de CH |
1706 | state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); |
1707 | ||
1708 | WARN_ON(state != SRPT_STATE_CMD_RSP_SENT && | |
1709 | state != SRPT_STATE_MGMT_RSP_SENT); | |
1710 | ||
1711 | atomic_inc(&ch->sq_wr_avail); | |
1712 | ||
49f40163 | 1713 | if (wc->status != IB_WC_SUCCESS) |
59fae4de CH |
1714 | pr_info("sending response for ioctx 0x%p failed" |
1715 | " with status %d\n", ioctx, wc->status); | |
1716 | ||
59fae4de CH |
1717 | if (state != SRPT_STATE_DONE) { |
1718 | srpt_unmap_sg_to_ib_sge(ch, ioctx); | |
1719 | transport_generic_free_cmd(&ioctx->cmd, 0); | |
a42d985b | 1720 | } else { |
59fae4de CH |
1721 | pr_err("IB completion has been received too late for" |
1722 | " wr_id = %u.\n", ioctx->ioctx.index); | |
a42d985b BVA |
1723 | } |
1724 | ||
59fae4de | 1725 | while (!list_empty(&ch->cmd_wait_list) && |
33912d73 | 1726 | ch->state == CH_LIVE && |
59fae4de | 1727 | (ioctx = srpt_get_send_ioctx(ch)) != NULL) { |
a42d985b BVA |
1728 | struct srpt_recv_ioctx *recv_ioctx; |
1729 | ||
1730 | recv_ioctx = list_first_entry(&ch->cmd_wait_list, | |
1731 | struct srpt_recv_ioctx, | |
1732 | wait_list); | |
1733 | list_del(&recv_ioctx->wait_list); | |
59fae4de | 1734 | srpt_handle_new_iu(ch, recv_ioctx, ioctx); |
a42d985b BVA |
1735 | } |
1736 | } | |
1737 | ||
a42d985b BVA |
1738 | /** |
1739 | * srpt_create_ch_ib() - Create receive and send completion queues. | |
1740 | */ | |
1741 | static int srpt_create_ch_ib(struct srpt_rdma_ch *ch) | |
1742 | { | |
1743 | struct ib_qp_init_attr *qp_init; | |
1744 | struct srpt_port *sport = ch->sport; | |
1745 | struct srpt_device *sdev = sport->sdev; | |
1746 | u32 srp_sq_size = sport->port_attrib.srp_sq_size; | |
1747 | int ret; | |
1748 | ||
1749 | WARN_ON(ch->rq_size < 1); | |
1750 | ||
1751 | ret = -ENOMEM; | |
9d2aa2b4 | 1752 | qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL); |
a42d985b BVA |
1753 | if (!qp_init) |
1754 | goto out; | |
1755 | ||
ab477c1f | 1756 | retry: |
59fae4de CH |
1757 | ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + srp_sq_size, |
1758 | 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE); | |
a42d985b BVA |
1759 | if (IS_ERR(ch->cq)) { |
1760 | ret = PTR_ERR(ch->cq); | |
9f5d32af | 1761 | pr_err("failed to create CQ cqe= %d ret= %d\n", |
a42d985b BVA |
1762 | ch->rq_size + srp_sq_size, ret); |
1763 | goto out; | |
1764 | } | |
1765 | ||
1766 | qp_init->qp_context = (void *)ch; | |
1767 | qp_init->event_handler | |
1768 | = (void(*)(struct ib_event *, void*))srpt_qp_event; | |
1769 | qp_init->send_cq = ch->cq; | |
1770 | qp_init->recv_cq = ch->cq; | |
1771 | qp_init->srq = sdev->srq; | |
1772 | qp_init->sq_sig_type = IB_SIGNAL_REQ_WR; | |
1773 | qp_init->qp_type = IB_QPT_RC; | |
1774 | qp_init->cap.max_send_wr = srp_sq_size; | |
1775 | qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE; | |
1776 | ||
1777 | ch->qp = ib_create_qp(sdev->pd, qp_init); | |
1778 | if (IS_ERR(ch->qp)) { | |
1779 | ret = PTR_ERR(ch->qp); | |
ab477c1f BVA |
1780 | if (ret == -ENOMEM) { |
1781 | srp_sq_size /= 2; | |
1782 | if (srp_sq_size >= MIN_SRPT_SQ_SIZE) { | |
1783 | ib_destroy_cq(ch->cq); | |
1784 | goto retry; | |
1785 | } | |
1786 | } | |
9f5d32af | 1787 | pr_err("failed to create_qp ret= %d\n", ret); |
a42d985b BVA |
1788 | goto err_destroy_cq; |
1789 | } | |
1790 | ||
1791 | atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr); | |
1792 | ||
1793 | pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n", | |
1794 | __func__, ch->cq->cqe, qp_init->cap.max_send_sge, | |
1795 | qp_init->cap.max_send_wr, ch->cm_id); | |
1796 | ||
1797 | ret = srpt_init_ch_qp(ch, ch->qp); | |
1798 | if (ret) | |
1799 | goto err_destroy_qp; | |
1800 | ||
a42d985b BVA |
1801 | out: |
1802 | kfree(qp_init); | |
1803 | return ret; | |
1804 | ||
1805 | err_destroy_qp: | |
1806 | ib_destroy_qp(ch->qp); | |
1807 | err_destroy_cq: | |
59fae4de | 1808 | ib_free_cq(ch->cq); |
a42d985b BVA |
1809 | goto out; |
1810 | } | |
1811 | ||
1812 | static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch) | |
1813 | { | |
a42d985b | 1814 | ib_destroy_qp(ch->qp); |
59fae4de | 1815 | ib_free_cq(ch->cq); |
a42d985b BVA |
1816 | } |
1817 | ||
1818 | /** | |
1819 | * __srpt_close_ch() - Close an RDMA channel by setting the QP error state. | |
1820 | * | |
1821 | * Reset the QP and make sure all resources associated with the channel will | |
1822 | * be deallocated at an appropriate time. | |
1823 | * | |
1824 | * Note: The caller must hold ch->sport->sdev->spinlock. | |
1825 | */ | |
1826 | static void __srpt_close_ch(struct srpt_rdma_ch *ch) | |
1827 | { | |
a42d985b BVA |
1828 | enum rdma_ch_state prev_state; |
1829 | unsigned long flags; | |
1830 | ||
a42d985b BVA |
1831 | spin_lock_irqsave(&ch->spinlock, flags); |
1832 | prev_state = ch->state; | |
1833 | switch (prev_state) { | |
1834 | case CH_CONNECTING: | |
1835 | case CH_LIVE: | |
1836 | ch->state = CH_DISCONNECTING; | |
1837 | break; | |
1838 | default: | |
1839 | break; | |
1840 | } | |
1841 | spin_unlock_irqrestore(&ch->spinlock, flags); | |
1842 | ||
1843 | switch (prev_state) { | |
1844 | case CH_CONNECTING: | |
1845 | ib_send_cm_rej(ch->cm_id, IB_CM_REJ_NO_RESOURCES, NULL, 0, | |
1846 | NULL, 0); | |
1847 | /* fall through */ | |
1848 | case CH_LIVE: | |
1849 | if (ib_send_cm_dreq(ch->cm_id, NULL, 0) < 0) | |
9f5d32af | 1850 | pr_err("sending CM DREQ failed.\n"); |
a42d985b BVA |
1851 | break; |
1852 | case CH_DISCONNECTING: | |
1853 | break; | |
1854 | case CH_DRAINING: | |
1855 | case CH_RELEASING: | |
1856 | break; | |
1857 | } | |
1858 | } | |
1859 | ||
1860 | /** | |
1861 | * srpt_close_ch() - Close an RDMA channel. | |
1862 | */ | |
1863 | static void srpt_close_ch(struct srpt_rdma_ch *ch) | |
1864 | { | |
1865 | struct srpt_device *sdev; | |
1866 | ||
1867 | sdev = ch->sport->sdev; | |
1868 | spin_lock_irq(&sdev->spinlock); | |
1869 | __srpt_close_ch(ch); | |
1870 | spin_unlock_irq(&sdev->spinlock); | |
1871 | } | |
1872 | ||
1d19f780 NB |
1873 | /** |
1874 | * srpt_shutdown_session() - Whether or not a session may be shut down. | |
1875 | */ | |
1876 | static int srpt_shutdown_session(struct se_session *se_sess) | |
1877 | { | |
88936259 | 1878 | return 1; |
1d19f780 NB |
1879 | } |
1880 | ||
a42d985b BVA |
1881 | /** |
1882 | * srpt_drain_channel() - Drain a channel by resetting the IB queue pair. | |
1883 | * @cm_id: Pointer to the CM ID of the channel to be drained. | |
1884 | * | |
1885 | * Note: Must be called from inside srpt_cm_handler to avoid a race between | |
1886 | * accessing sdev->spinlock and the call to kfree(sdev) in srpt_remove_one() | |
1887 | * (the caller of srpt_cm_handler holds the cm_id spinlock; srpt_remove_one() | |
1888 | * waits until all target sessions for the associated IB device have been | |
1889 | * unregistered and target session registration involves a call to | |
1890 | * ib_destroy_cm_id(), which locks the cm_id spinlock and hence waits until | |
1891 | * this function has finished). | |
1892 | */ | |
2739b592 | 1893 | static void srpt_drain_channel(struct srpt_rdma_ch *ch) |
a42d985b | 1894 | { |
a42d985b BVA |
1895 | int ret; |
1896 | bool do_reset = false; | |
1897 | ||
1898 | WARN_ON_ONCE(irqs_disabled()); | |
1899 | ||
2739b592 | 1900 | do_reset = srpt_set_ch_state(ch, CH_DRAINING); |
a42d985b BVA |
1901 | |
1902 | if (do_reset) { | |
1d19f780 NB |
1903 | if (ch->sess) |
1904 | srpt_shutdown_session(ch->sess); | |
1905 | ||
a42d985b BVA |
1906 | ret = srpt_ch_qp_err(ch); |
1907 | if (ret < 0) | |
9f5d32af | 1908 | pr_err("Setting queue pair in error state" |
a42d985b BVA |
1909 | " failed: %d\n", ret); |
1910 | } | |
1911 | } | |
1912 | ||
a42d985b BVA |
1913 | /** |
1914 | * srpt_release_channel() - Release channel resources. | |
1915 | * | |
1916 | * Schedules the actual release because: | |
1917 | * - Calling the ib_destroy_cm_id() call from inside an IB CM callback would | |
1918 | * trigger a deadlock. | |
1919 | * - It is not safe to call TCM transport_* functions from interrupt context. | |
1920 | */ | |
1921 | static void srpt_release_channel(struct srpt_rdma_ch *ch) | |
1922 | { | |
1923 | schedule_work(&ch->release_work); | |
1924 | } | |
1925 | ||
1926 | static void srpt_release_channel_work(struct work_struct *w) | |
1927 | { | |
1928 | struct srpt_rdma_ch *ch; | |
1929 | struct srpt_device *sdev; | |
9474b043 | 1930 | struct se_session *se_sess; |
a42d985b BVA |
1931 | |
1932 | ch = container_of(w, struct srpt_rdma_ch, release_work); | |
f108f0f6 BVA |
1933 | pr_debug("%s: %s-%d; release_done = %p\n", __func__, ch->sess_name, |
1934 | ch->qp->qp_num, ch->release_done); | |
a42d985b BVA |
1935 | |
1936 | sdev = ch->sport->sdev; | |
1937 | BUG_ON(!sdev); | |
1938 | ||
9474b043 NB |
1939 | se_sess = ch->sess; |
1940 | BUG_ON(!se_sess); | |
1941 | ||
88936259 | 1942 | target_sess_cmd_list_set_waiting(se_sess); |
be646c2d | 1943 | target_wait_for_sess_cmds(se_sess); |
9474b043 NB |
1944 | |
1945 | transport_deregister_session_configfs(se_sess); | |
1946 | transport_deregister_session(se_sess); | |
a42d985b BVA |
1947 | ch->sess = NULL; |
1948 | ||
0b41d6ca NB |
1949 | ib_destroy_cm_id(ch->cm_id); |
1950 | ||
a42d985b BVA |
1951 | srpt_destroy_ch_ib(ch); |
1952 | ||
1953 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
1954 | ch->sport->sdev, ch->rq_size, | |
1955 | ch->rsp_size, DMA_TO_DEVICE); | |
1956 | ||
1957 | spin_lock_irq(&sdev->spinlock); | |
f108f0f6 | 1958 | list_del_init(&ch->list); |
a42d985b BVA |
1959 | if (ch->release_done) |
1960 | complete(ch->release_done); | |
f108f0f6 | 1961 | spin_unlock_irq(&sdev->spinlock); |
a42d985b BVA |
1962 | |
1963 | wake_up(&sdev->ch_releaseQ); | |
1964 | ||
1965 | kfree(ch); | |
1966 | } | |
1967 | ||
a42d985b BVA |
1968 | /** |
1969 | * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED. | |
1970 | * | |
1971 | * Ownership of the cm_id is transferred to the target session if this | |
1972 | * functions returns zero. Otherwise the caller remains the owner of cm_id. | |
1973 | */ | |
1974 | static int srpt_cm_req_recv(struct ib_cm_id *cm_id, | |
1975 | struct ib_cm_req_event_param *param, | |
1976 | void *private_data) | |
1977 | { | |
1978 | struct srpt_device *sdev = cm_id->context; | |
1979 | struct srpt_port *sport = &sdev->port[param->port - 1]; | |
1980 | struct srp_login_req *req; | |
1981 | struct srp_login_rsp *rsp; | |
1982 | struct srp_login_rej *rej; | |
1983 | struct ib_cm_rep_param *rep_param; | |
1984 | struct srpt_rdma_ch *ch, *tmp_ch; | |
f246c941 | 1985 | struct se_node_acl *se_acl; |
a42d985b | 1986 | u32 it_iu_len; |
f246c941 NB |
1987 | int i, ret = 0; |
1988 | unsigned char *p; | |
a42d985b BVA |
1989 | |
1990 | WARN_ON_ONCE(irqs_disabled()); | |
1991 | ||
1992 | if (WARN_ON(!sdev || !private_data)) | |
1993 | return -EINVAL; | |
1994 | ||
1995 | req = (struct srp_login_req *)private_data; | |
1996 | ||
1997 | it_iu_len = be32_to_cpu(req->req_it_iu_len); | |
1998 | ||
9f5d32af DL |
1999 | pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx," |
2000 | " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d" | |
2001 | " (guid=0x%llx:0x%llx)\n", | |
2002 | be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]), | |
2003 | be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]), | |
2004 | be64_to_cpu(*(__be64 *)&req->target_port_id[0]), | |
2005 | be64_to_cpu(*(__be64 *)&req->target_port_id[8]), | |
2006 | it_iu_len, | |
2007 | param->port, | |
2008 | be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]), | |
2009 | be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8])); | |
a42d985b | 2010 | |
9d2aa2b4 BVA |
2011 | rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); |
2012 | rej = kzalloc(sizeof(*rej), GFP_KERNEL); | |
2013 | rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL); | |
a42d985b BVA |
2014 | |
2015 | if (!rsp || !rej || !rep_param) { | |
2016 | ret = -ENOMEM; | |
2017 | goto out; | |
2018 | } | |
2019 | ||
2020 | if (it_iu_len > srp_max_req_size || it_iu_len < 64) { | |
b356c1c1 VT |
2021 | rej->reason = cpu_to_be32( |
2022 | SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE); | |
a42d985b | 2023 | ret = -EINVAL; |
9f5d32af | 2024 | pr_err("rejected SRP_LOGIN_REQ because its" |
a42d985b BVA |
2025 | " length (%d bytes) is out of range (%d .. %d)\n", |
2026 | it_iu_len, 64, srp_max_req_size); | |
2027 | goto reject; | |
2028 | } | |
2029 | ||
2030 | if (!sport->enabled) { | |
b356c1c1 VT |
2031 | rej->reason = cpu_to_be32( |
2032 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
a42d985b | 2033 | ret = -EINVAL; |
9f5d32af | 2034 | pr_err("rejected SRP_LOGIN_REQ because the target port" |
a42d985b BVA |
2035 | " has not yet been enabled\n"); |
2036 | goto reject; | |
2037 | } | |
2038 | ||
2039 | if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) { | |
2040 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN; | |
2041 | ||
2042 | spin_lock_irq(&sdev->spinlock); | |
2043 | ||
2044 | list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) { | |
2045 | if (!memcmp(ch->i_port_id, req->initiator_port_id, 16) | |
2046 | && !memcmp(ch->t_port_id, req->target_port_id, 16) | |
2047 | && param->port == ch->sport->port | |
2048 | && param->listen_id == ch->sport->sdev->cm_id | |
2049 | && ch->cm_id) { | |
33912d73 BVA |
2050 | if (ch->state != CH_CONNECTING |
2051 | && ch->state != CH_LIVE) | |
a42d985b BVA |
2052 | continue; |
2053 | ||
2054 | /* found an existing channel */ | |
2055 | pr_debug("Found existing channel %s" | |
2056 | " cm_id= %p state= %d\n", | |
33912d73 | 2057 | ch->sess_name, ch->cm_id, ch->state); |
a42d985b BVA |
2058 | |
2059 | __srpt_close_ch(ch); | |
2060 | ||
2061 | rsp->rsp_flags = | |
2062 | SRP_LOGIN_RSP_MULTICHAN_TERMINATED; | |
2063 | } | |
2064 | } | |
2065 | ||
2066 | spin_unlock_irq(&sdev->spinlock); | |
2067 | ||
2068 | } else | |
2069 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED; | |
2070 | ||
2071 | if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid) | |
2072 | || *(__be64 *)(req->target_port_id + 8) != | |
2073 | cpu_to_be64(srpt_service_guid)) { | |
b356c1c1 VT |
2074 | rej->reason = cpu_to_be32( |
2075 | SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL); | |
a42d985b | 2076 | ret = -ENOMEM; |
9f5d32af | 2077 | pr_err("rejected SRP_LOGIN_REQ because it" |
a42d985b BVA |
2078 | " has an invalid target port identifier.\n"); |
2079 | goto reject; | |
2080 | } | |
2081 | ||
9d2aa2b4 | 2082 | ch = kzalloc(sizeof(*ch), GFP_KERNEL); |
a42d985b | 2083 | if (!ch) { |
b356c1c1 VT |
2084 | rej->reason = cpu_to_be32( |
2085 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
9f5d32af | 2086 | pr_err("rejected SRP_LOGIN_REQ because no memory.\n"); |
a42d985b BVA |
2087 | ret = -ENOMEM; |
2088 | goto reject; | |
2089 | } | |
2090 | ||
2091 | INIT_WORK(&ch->release_work, srpt_release_channel_work); | |
2092 | memcpy(ch->i_port_id, req->initiator_port_id, 16); | |
2093 | memcpy(ch->t_port_id, req->target_port_id, 16); | |
2094 | ch->sport = &sdev->port[param->port - 1]; | |
2095 | ch->cm_id = cm_id; | |
2739b592 | 2096 | cm_id->context = ch; |
a42d985b BVA |
2097 | /* |
2098 | * Avoid QUEUE_FULL conditions by limiting the number of buffers used | |
2099 | * for the SRP protocol to the command queue size. | |
2100 | */ | |
2101 | ch->rq_size = SRPT_RQ_SIZE; | |
2102 | spin_lock_init(&ch->spinlock); | |
2103 | ch->state = CH_CONNECTING; | |
2104 | INIT_LIST_HEAD(&ch->cmd_wait_list); | |
2105 | ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size; | |
2106 | ||
2107 | ch->ioctx_ring = (struct srpt_send_ioctx **) | |
2108 | srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, | |
2109 | sizeof(*ch->ioctx_ring[0]), | |
2110 | ch->rsp_size, DMA_TO_DEVICE); | |
2111 | if (!ch->ioctx_ring) | |
2112 | goto free_ch; | |
2113 | ||
2114 | INIT_LIST_HEAD(&ch->free_list); | |
2115 | for (i = 0; i < ch->rq_size; i++) { | |
2116 | ch->ioctx_ring[i]->ch = ch; | |
2117 | list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list); | |
2118 | } | |
2119 | ||
2120 | ret = srpt_create_ch_ib(ch); | |
2121 | if (ret) { | |
b356c1c1 VT |
2122 | rej->reason = cpu_to_be32( |
2123 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
9f5d32af | 2124 | pr_err("rejected SRP_LOGIN_REQ because creating" |
a42d985b BVA |
2125 | " a new RDMA channel failed.\n"); |
2126 | goto free_ring; | |
2127 | } | |
2128 | ||
2129 | ret = srpt_ch_qp_rtr(ch, ch->qp); | |
2130 | if (ret) { | |
b356c1c1 | 2131 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
9f5d32af | 2132 | pr_err("rejected SRP_LOGIN_REQ because enabling" |
a42d985b BVA |
2133 | " RTR failed (error code = %d)\n", ret); |
2134 | goto destroy_ib; | |
2135 | } | |
f246c941 | 2136 | |
a42d985b | 2137 | /* |
f246c941 NB |
2138 | * Use the initator port identifier as the session name, when |
2139 | * checking against se_node_acl->initiatorname[] this can be | |
2140 | * with or without preceeding '0x'. | |
a42d985b BVA |
2141 | */ |
2142 | snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx", | |
2143 | be64_to_cpu(*(__be64 *)ch->i_port_id), | |
2144 | be64_to_cpu(*(__be64 *)(ch->i_port_id + 8))); | |
2145 | ||
2146 | pr_debug("registering session %s\n", ch->sess_name); | |
f246c941 | 2147 | p = &ch->sess_name[0]; |
a42d985b | 2148 | |
f246c941 NB |
2149 | ch->sess = transport_init_session(TARGET_PROT_NORMAL); |
2150 | if (IS_ERR(ch->sess)) { | |
b356c1c1 | 2151 | rej->reason = cpu_to_be32( |
f246c941 NB |
2152 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
2153 | pr_debug("Failed to create session\n"); | |
a42d985b BVA |
2154 | goto destroy_ib; |
2155 | } | |
2156 | ||
f246c941 NB |
2157 | try_again: |
2158 | se_acl = core_tpg_get_initiator_node_acl(&sport->port_tpg_1, p); | |
2159 | if (!se_acl) { | |
2160 | pr_info("Rejected login because no ACL has been" | |
2161 | " configured yet for initiator %s.\n", ch->sess_name); | |
2162 | /* | |
2163 | * XXX: Hack to retry of ch->i_port_id without leading '0x' | |
2164 | */ | |
2165 | if (p == &ch->sess_name[0]) { | |
2166 | p += 2; | |
2167 | goto try_again; | |
2168 | } | |
b356c1c1 | 2169 | rej->reason = cpu_to_be32( |
f246c941 NB |
2170 | SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED); |
2171 | transport_free_session(ch->sess); | |
2172 | goto destroy_ib; | |
a42d985b | 2173 | } |
f246c941 NB |
2174 | ch->sess->se_node_acl = se_acl; |
2175 | ||
2176 | transport_register_session(&sport->port_tpg_1, se_acl, ch->sess, ch); | |
a42d985b BVA |
2177 | |
2178 | pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess, | |
2179 | ch->sess_name, ch->cm_id); | |
2180 | ||
2181 | /* create srp_login_response */ | |
2182 | rsp->opcode = SRP_LOGIN_RSP; | |
2183 | rsp->tag = req->tag; | |
2184 | rsp->max_it_iu_len = req->req_it_iu_len; | |
2185 | rsp->max_ti_iu_len = req->req_it_iu_len; | |
2186 | ch->max_ti_iu_len = it_iu_len; | |
b356c1c1 VT |
2187 | rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2188 | | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b BVA |
2189 | rsp->req_lim_delta = cpu_to_be32(ch->rq_size); |
2190 | atomic_set(&ch->req_lim, ch->rq_size); | |
2191 | atomic_set(&ch->req_lim_delta, 0); | |
2192 | ||
2193 | /* create cm reply */ | |
2194 | rep_param->qp_num = ch->qp->qp_num; | |
2195 | rep_param->private_data = (void *)rsp; | |
9d2aa2b4 | 2196 | rep_param->private_data_len = sizeof(*rsp); |
a42d985b BVA |
2197 | rep_param->rnr_retry_count = 7; |
2198 | rep_param->flow_control = 1; | |
2199 | rep_param->failover_accepted = 0; | |
2200 | rep_param->srq = 1; | |
2201 | rep_param->responder_resources = 4; | |
2202 | rep_param->initiator_depth = 4; | |
2203 | ||
2204 | ret = ib_send_cm_rep(cm_id, rep_param); | |
2205 | if (ret) { | |
9f5d32af | 2206 | pr_err("sending SRP_LOGIN_REQ response failed" |
a42d985b BVA |
2207 | " (error code = %d)\n", ret); |
2208 | goto release_channel; | |
2209 | } | |
2210 | ||
2211 | spin_lock_irq(&sdev->spinlock); | |
2212 | list_add_tail(&ch->list, &sdev->rch_list); | |
2213 | spin_unlock_irq(&sdev->spinlock); | |
2214 | ||
2215 | goto out; | |
2216 | ||
2217 | release_channel: | |
2218 | srpt_set_ch_state(ch, CH_RELEASING); | |
2219 | transport_deregister_session_configfs(ch->sess); | |
a42d985b BVA |
2220 | transport_deregister_session(ch->sess); |
2221 | ch->sess = NULL; | |
2222 | ||
2223 | destroy_ib: | |
2224 | srpt_destroy_ch_ib(ch); | |
2225 | ||
2226 | free_ring: | |
2227 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
2228 | ch->sport->sdev, ch->rq_size, | |
2229 | ch->rsp_size, DMA_TO_DEVICE); | |
2230 | free_ch: | |
2231 | kfree(ch); | |
2232 | ||
2233 | reject: | |
2234 | rej->opcode = SRP_LOGIN_REJ; | |
2235 | rej->tag = req->tag; | |
b356c1c1 VT |
2236 | rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2237 | | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b BVA |
2238 | |
2239 | ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, | |
9d2aa2b4 | 2240 | (void *)rej, sizeof(*rej)); |
a42d985b BVA |
2241 | |
2242 | out: | |
2243 | kfree(rep_param); | |
2244 | kfree(rsp); | |
2245 | kfree(rej); | |
2246 | ||
2247 | return ret; | |
2248 | } | |
2249 | ||
2739b592 BVA |
2250 | static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch, |
2251 | enum ib_cm_rej_reason reason, | |
2252 | const u8 *private_data, | |
2253 | u8 private_data_len) | |
a42d985b | 2254 | { |
2739b592 BVA |
2255 | pr_info("Received CM REJ for ch %s-%d; reason %d.\n", |
2256 | ch->sess_name, ch->qp->qp_num, reason); | |
2257 | srpt_drain_channel(ch); | |
a42d985b BVA |
2258 | } |
2259 | ||
2260 | /** | |
2261 | * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event. | |
2262 | * | |
2263 | * An IB_CM_RTU_RECEIVED message indicates that the connection is established | |
2264 | * and that the recipient may begin transmitting (RTU = ready to use). | |
2265 | */ | |
2739b592 | 2266 | static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch) |
a42d985b | 2267 | { |
a42d985b BVA |
2268 | int ret; |
2269 | ||
f130c220 | 2270 | if (srpt_set_ch_state(ch, CH_LIVE)) { |
a42d985b BVA |
2271 | struct srpt_recv_ioctx *ioctx, *ioctx_tmp; |
2272 | ||
2273 | ret = srpt_ch_qp_rts(ch, ch->qp); | |
2274 | ||
2275 | list_for_each_entry_safe(ioctx, ioctx_tmp, &ch->cmd_wait_list, | |
2276 | wait_list) { | |
2277 | list_del(&ioctx->wait_list); | |
2278 | srpt_handle_new_iu(ch, ioctx, NULL); | |
2279 | } | |
2280 | if (ret) | |
2281 | srpt_close_ch(ch); | |
2282 | } | |
2283 | } | |
2284 | ||
a42d985b BVA |
2285 | /** |
2286 | * srpt_cm_dreq_recv() - Process reception of a DREQ message. | |
2287 | */ | |
2739b592 | 2288 | static void srpt_cm_dreq_recv(struct srpt_rdma_ch *ch) |
a42d985b | 2289 | { |
a42d985b BVA |
2290 | unsigned long flags; |
2291 | bool send_drep = false; | |
2292 | ||
2739b592 BVA |
2293 | pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num, |
2294 | ch->state); | |
a42d985b BVA |
2295 | |
2296 | spin_lock_irqsave(&ch->spinlock, flags); | |
2297 | switch (ch->state) { | |
2298 | case CH_CONNECTING: | |
2299 | case CH_LIVE: | |
2300 | send_drep = true; | |
2301 | ch->state = CH_DISCONNECTING; | |
2302 | break; | |
2303 | case CH_DISCONNECTING: | |
2304 | case CH_DRAINING: | |
2305 | case CH_RELEASING: | |
2306 | WARN(true, "unexpected channel state %d\n", ch->state); | |
2307 | break; | |
2308 | } | |
2309 | spin_unlock_irqrestore(&ch->spinlock, flags); | |
2310 | ||
2311 | if (send_drep) { | |
2312 | if (ib_send_cm_drep(ch->cm_id, NULL, 0) < 0) | |
9f5d32af DL |
2313 | pr_err("Sending IB DREP failed.\n"); |
2314 | pr_info("Received DREQ and sent DREP for session %s.\n", | |
2315 | ch->sess_name); | |
a42d985b BVA |
2316 | } |
2317 | } | |
2318 | ||
a42d985b BVA |
2319 | /** |
2320 | * srpt_cm_handler() - IB connection manager callback function. | |
2321 | * | |
2322 | * A non-zero return value will cause the caller destroy the CM ID. | |
2323 | * | |
2324 | * Note: srpt_cm_handler() must only return a non-zero value when transferring | |
2325 | * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning | |
2326 | * a non-zero value in any other case will trigger a race with the | |
2327 | * ib_destroy_cm_id() call in srpt_release_channel(). | |
2328 | */ | |
2329 | static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
2330 | { | |
2739b592 | 2331 | struct srpt_rdma_ch *ch = cm_id->context; |
a42d985b BVA |
2332 | int ret; |
2333 | ||
2334 | ret = 0; | |
2335 | switch (event->event) { | |
2336 | case IB_CM_REQ_RECEIVED: | |
2337 | ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd, | |
2338 | event->private_data); | |
2339 | break; | |
2340 | case IB_CM_REJ_RECEIVED: | |
2739b592 BVA |
2341 | srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason, |
2342 | event->private_data, | |
2343 | IB_CM_REJ_PRIVATE_DATA_SIZE); | |
a42d985b BVA |
2344 | break; |
2345 | case IB_CM_RTU_RECEIVED: | |
2346 | case IB_CM_USER_ESTABLISHED: | |
2739b592 | 2347 | srpt_cm_rtu_recv(ch); |
a42d985b BVA |
2348 | break; |
2349 | case IB_CM_DREQ_RECEIVED: | |
2739b592 | 2350 | srpt_cm_dreq_recv(ch); |
a42d985b BVA |
2351 | break; |
2352 | case IB_CM_DREP_RECEIVED: | |
2739b592 BVA |
2353 | pr_info("Received CM DREP message for ch %s-%d.\n", |
2354 | ch->sess_name, ch->qp->qp_num); | |
2355 | srpt_drain_channel(ch); | |
a42d985b BVA |
2356 | break; |
2357 | case IB_CM_TIMEWAIT_EXIT: | |
2739b592 BVA |
2358 | pr_info("Received CM TimeWait exit for ch %s-%d.\n", |
2359 | ch->sess_name, ch->qp->qp_num); | |
2360 | srpt_drain_channel(ch); | |
a42d985b BVA |
2361 | break; |
2362 | case IB_CM_REP_ERROR: | |
2739b592 BVA |
2363 | pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
2364 | ch->qp->qp_num); | |
2365 | srpt_drain_channel(ch); | |
a42d985b BVA |
2366 | break; |
2367 | case IB_CM_DREQ_ERROR: | |
1e20a2a5 | 2368 | pr_info("Received CM DREQ ERROR event.\n"); |
a42d985b BVA |
2369 | break; |
2370 | case IB_CM_MRA_RECEIVED: | |
1e20a2a5 | 2371 | pr_info("Received CM MRA event\n"); |
a42d985b BVA |
2372 | break; |
2373 | default: | |
1e20a2a5 | 2374 | pr_err("received unrecognized CM event %d\n", event->event); |
a42d985b BVA |
2375 | break; |
2376 | } | |
2377 | ||
2378 | return ret; | |
2379 | } | |
2380 | ||
2381 | /** | |
2382 | * srpt_perform_rdmas() - Perform IB RDMA. | |
2383 | * | |
2384 | * Returns zero upon success or a negative number upon failure. | |
2385 | */ | |
2386 | static int srpt_perform_rdmas(struct srpt_rdma_ch *ch, | |
2387 | struct srpt_send_ioctx *ioctx) | |
2388 | { | |
a42d985b | 2389 | struct ib_send_wr *bad_wr; |
59fae4de | 2390 | int sq_wr_avail, ret, i; |
a42d985b BVA |
2391 | enum dma_data_direction dir; |
2392 | const int n_rdma = ioctx->n_rdma; | |
2393 | ||
2394 | dir = ioctx->cmd.data_direction; | |
2395 | if (dir == DMA_TO_DEVICE) { | |
2396 | /* write */ | |
2397 | ret = -ENOMEM; | |
2398 | sq_wr_avail = atomic_sub_return(n_rdma, &ch->sq_wr_avail); | |
2399 | if (sq_wr_avail < 0) { | |
9f5d32af DL |
2400 | pr_warn("IB send queue full (needed %d)\n", |
2401 | n_rdma); | |
a42d985b BVA |
2402 | goto out; |
2403 | } | |
2404 | } | |
2405 | ||
59fae4de CH |
2406 | for (i = 0; i < n_rdma; i++) { |
2407 | struct ib_send_wr *wr = &ioctx->rdma_wrs[i].wr; | |
a42d985b | 2408 | |
59fae4de CH |
2409 | wr->opcode = (dir == DMA_FROM_DEVICE) ? |
2410 | IB_WR_RDMA_WRITE : IB_WR_RDMA_READ; | |
a42d985b | 2411 | |
59fae4de CH |
2412 | if (i == n_rdma - 1) { |
2413 | /* only get completion event for the last rdma read */ | |
2414 | if (dir == DMA_TO_DEVICE) { | |
2415 | wr->send_flags = IB_SEND_SIGNALED; | |
2416 | ioctx->rdma_cqe.done = srpt_rdma_read_done; | |
2417 | } else { | |
2418 | ioctx->rdma_cqe.done = srpt_rdma_write_done; | |
2419 | } | |
2420 | wr->wr_cqe = &ioctx->rdma_cqe; | |
2421 | wr->next = NULL; | |
2422 | } else { | |
2423 | wr->wr_cqe = NULL; | |
2424 | wr->next = &ioctx->rdma_wrs[i + 1].wr; | |
2425 | } | |
a42d985b BVA |
2426 | } |
2427 | ||
59fae4de | 2428 | ret = ib_post_send(ch->qp, &ioctx->rdma_wrs->wr, &bad_wr); |
a42d985b | 2429 | if (ret) |
9f5d32af | 2430 | pr_err("%s[%d]: ib_post_send() returned %d for %d/%d\n", |
a42d985b | 2431 | __func__, __LINE__, ret, i, n_rdma); |
a42d985b BVA |
2432 | out: |
2433 | if (unlikely(dir == DMA_TO_DEVICE && ret < 0)) | |
2434 | atomic_add(n_rdma, &ch->sq_wr_avail); | |
2435 | return ret; | |
2436 | } | |
2437 | ||
2438 | /** | |
2439 | * srpt_xfer_data() - Start data transfer from initiator to target. | |
2440 | */ | |
2441 | static int srpt_xfer_data(struct srpt_rdma_ch *ch, | |
2442 | struct srpt_send_ioctx *ioctx) | |
2443 | { | |
2444 | int ret; | |
2445 | ||
2446 | ret = srpt_map_sg_to_ib_sge(ch, ioctx); | |
2447 | if (ret) { | |
9f5d32af | 2448 | pr_err("%s[%d] ret=%d\n", __func__, __LINE__, ret); |
a42d985b BVA |
2449 | goto out; |
2450 | } | |
2451 | ||
2452 | ret = srpt_perform_rdmas(ch, ioctx); | |
2453 | if (ret) { | |
2454 | if (ret == -EAGAIN || ret == -ENOMEM) | |
9f5d32af DL |
2455 | pr_info("%s[%d] queue full -- ret=%d\n", |
2456 | __func__, __LINE__, ret); | |
a42d985b | 2457 | else |
9f5d32af | 2458 | pr_err("%s[%d] fatal error -- ret=%d\n", |
a42d985b BVA |
2459 | __func__, __LINE__, ret); |
2460 | goto out_unmap; | |
2461 | } | |
2462 | ||
2463 | out: | |
2464 | return ret; | |
2465 | out_unmap: | |
2466 | srpt_unmap_sg_to_ib_sge(ch, ioctx); | |
2467 | goto out; | |
2468 | } | |
2469 | ||
2470 | static int srpt_write_pending_status(struct se_cmd *se_cmd) | |
2471 | { | |
2472 | struct srpt_send_ioctx *ioctx; | |
2473 | ||
2474 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2475 | return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA; | |
2476 | } | |
2477 | ||
2478 | /* | |
2479 | * srpt_write_pending() - Start data transfer from initiator to target (write). | |
2480 | */ | |
2481 | static int srpt_write_pending(struct se_cmd *se_cmd) | |
2482 | { | |
2483 | struct srpt_rdma_ch *ch; | |
2484 | struct srpt_send_ioctx *ioctx; | |
2485 | enum srpt_command_state new_state; | |
a42d985b BVA |
2486 | int ret; |
2487 | ||
2488 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2489 | ||
2490 | new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA); | |
2491 | WARN_ON(new_state == SRPT_STATE_DONE); | |
2492 | ||
2493 | ch = ioctx->ch; | |
2494 | BUG_ON(!ch); | |
2495 | ||
33912d73 | 2496 | switch (ch->state) { |
a42d985b | 2497 | case CH_CONNECTING: |
33912d73 | 2498 | WARN(true, "unexpected channel state %d\n", ch->state); |
a42d985b BVA |
2499 | ret = -EINVAL; |
2500 | goto out; | |
2501 | case CH_LIVE: | |
2502 | break; | |
2503 | case CH_DISCONNECTING: | |
2504 | case CH_DRAINING: | |
2505 | case CH_RELEASING: | |
2506 | pr_debug("cmd with tag %lld: channel disconnecting\n", | |
649ee054 | 2507 | ioctx->cmd.tag); |
a42d985b BVA |
2508 | srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN); |
2509 | ret = -EINVAL; | |
2510 | goto out; | |
2511 | } | |
2512 | ret = srpt_xfer_data(ch, ioctx); | |
2513 | ||
2514 | out: | |
2515 | return ret; | |
2516 | } | |
2517 | ||
2518 | static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status) | |
2519 | { | |
2520 | switch (tcm_mgmt_status) { | |
2521 | case TMR_FUNCTION_COMPLETE: | |
2522 | return SRP_TSK_MGMT_SUCCESS; | |
2523 | case TMR_FUNCTION_REJECTED: | |
2524 | return SRP_TSK_MGMT_FUNC_NOT_SUPP; | |
2525 | } | |
2526 | return SRP_TSK_MGMT_FAILED; | |
2527 | } | |
2528 | ||
2529 | /** | |
2530 | * srpt_queue_response() - Transmits the response to a SCSI command. | |
2531 | * | |
2532 | * Callback function called by the TCM core. Must not block since it can be | |
2533 | * invoked on the context of the IB completion handler. | |
2534 | */ | |
b79fafac | 2535 | static void srpt_queue_response(struct se_cmd *cmd) |
a42d985b BVA |
2536 | { |
2537 | struct srpt_rdma_ch *ch; | |
2538 | struct srpt_send_ioctx *ioctx; | |
2539 | enum srpt_command_state state; | |
2540 | unsigned long flags; | |
2541 | int ret; | |
2542 | enum dma_data_direction dir; | |
2543 | int resp_len; | |
2544 | u8 srp_tm_status; | |
2545 | ||
a42d985b BVA |
2546 | ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); |
2547 | ch = ioctx->ch; | |
2548 | BUG_ON(!ch); | |
2549 | ||
2550 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
2551 | state = ioctx->state; | |
2552 | switch (state) { | |
2553 | case SRPT_STATE_NEW: | |
2554 | case SRPT_STATE_DATA_IN: | |
2555 | ioctx->state = SRPT_STATE_CMD_RSP_SENT; | |
2556 | break; | |
2557 | case SRPT_STATE_MGMT: | |
2558 | ioctx->state = SRPT_STATE_MGMT_RSP_SENT; | |
2559 | break; | |
2560 | default: | |
2561 | WARN(true, "ch %p; cmd %d: unexpected command state %d\n", | |
2562 | ch, ioctx->ioctx.index, ioctx->state); | |
2563 | break; | |
2564 | } | |
2565 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
2566 | ||
2567 | if (unlikely(transport_check_aborted_status(&ioctx->cmd, false) | |
2568 | || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) { | |
2569 | atomic_inc(&ch->req_lim_delta); | |
2570 | srpt_abort_cmd(ioctx); | |
b79fafac | 2571 | return; |
a42d985b BVA |
2572 | } |
2573 | ||
2574 | dir = ioctx->cmd.data_direction; | |
2575 | ||
2576 | /* For read commands, transfer the data to the initiator. */ | |
2577 | if (dir == DMA_FROM_DEVICE && ioctx->cmd.data_length && | |
2578 | !ioctx->queue_status_only) { | |
2579 | ret = srpt_xfer_data(ch, ioctx); | |
2580 | if (ret) { | |
9f5d32af | 2581 | pr_err("xfer_data failed for tag %llu\n", |
649ee054 | 2582 | ioctx->cmd.tag); |
b79fafac | 2583 | return; |
a42d985b BVA |
2584 | } |
2585 | } | |
2586 | ||
2587 | if (state != SRPT_STATE_MGMT) | |
649ee054 | 2588 | resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag, |
a42d985b BVA |
2589 | cmd->scsi_status); |
2590 | else { | |
2591 | srp_tm_status | |
2592 | = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response); | |
2593 | resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status, | |
649ee054 | 2594 | ioctx->cmd.tag); |
a42d985b BVA |
2595 | } |
2596 | ret = srpt_post_send(ch, ioctx, resp_len); | |
2597 | if (ret) { | |
9f5d32af | 2598 | pr_err("sending cmd response failed for tag %llu\n", |
649ee054 | 2599 | ioctx->cmd.tag); |
a42d985b BVA |
2600 | srpt_unmap_sg_to_ib_sge(ch, ioctx); |
2601 | srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); | |
afc16604 | 2602 | target_put_sess_cmd(&ioctx->cmd); |
a42d985b | 2603 | } |
b79fafac | 2604 | } |
a42d985b | 2605 | |
b79fafac JE |
2606 | static int srpt_queue_data_in(struct se_cmd *cmd) |
2607 | { | |
2608 | srpt_queue_response(cmd); | |
2609 | return 0; | |
2610 | } | |
2611 | ||
2612 | static void srpt_queue_tm_rsp(struct se_cmd *cmd) | |
2613 | { | |
2614 | srpt_queue_response(cmd); | |
a42d985b BVA |
2615 | } |
2616 | ||
131e6abc NB |
2617 | static void srpt_aborted_task(struct se_cmd *cmd) |
2618 | { | |
2619 | struct srpt_send_ioctx *ioctx = container_of(cmd, | |
2620 | struct srpt_send_ioctx, cmd); | |
2621 | ||
2622 | srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx); | |
2623 | } | |
2624 | ||
a42d985b BVA |
2625 | static int srpt_queue_status(struct se_cmd *cmd) |
2626 | { | |
2627 | struct srpt_send_ioctx *ioctx; | |
2628 | ||
2629 | ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); | |
2630 | BUG_ON(ioctx->sense_data != cmd->sense_buffer); | |
2631 | if (cmd->se_cmd_flags & | |
2632 | (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE)) | |
2633 | WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION); | |
2634 | ioctx->queue_status_only = true; | |
b79fafac JE |
2635 | srpt_queue_response(cmd); |
2636 | return 0; | |
a42d985b BVA |
2637 | } |
2638 | ||
2639 | static void srpt_refresh_port_work(struct work_struct *work) | |
2640 | { | |
2641 | struct srpt_port *sport = container_of(work, struct srpt_port, work); | |
2642 | ||
2643 | srpt_refresh_port(sport); | |
2644 | } | |
2645 | ||
2646 | static int srpt_ch_list_empty(struct srpt_device *sdev) | |
2647 | { | |
2648 | int res; | |
2649 | ||
2650 | spin_lock_irq(&sdev->spinlock); | |
2651 | res = list_empty(&sdev->rch_list); | |
2652 | spin_unlock_irq(&sdev->spinlock); | |
2653 | ||
2654 | return res; | |
2655 | } | |
2656 | ||
2657 | /** | |
2658 | * srpt_release_sdev() - Free the channel resources associated with a target. | |
2659 | */ | |
2660 | static int srpt_release_sdev(struct srpt_device *sdev) | |
2661 | { | |
2662 | struct srpt_rdma_ch *ch, *tmp_ch; | |
2663 | int res; | |
2664 | ||
2665 | WARN_ON_ONCE(irqs_disabled()); | |
2666 | ||
2667 | BUG_ON(!sdev); | |
2668 | ||
2669 | spin_lock_irq(&sdev->spinlock); | |
2670 | list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) | |
2671 | __srpt_close_ch(ch); | |
2672 | spin_unlock_irq(&sdev->spinlock); | |
2673 | ||
2674 | res = wait_event_interruptible(sdev->ch_releaseQ, | |
2675 | srpt_ch_list_empty(sdev)); | |
2676 | if (res) | |
9f5d32af | 2677 | pr_err("%s: interrupted.\n", __func__); |
a42d985b BVA |
2678 | |
2679 | return 0; | |
2680 | } | |
2681 | ||
2682 | static struct srpt_port *__srpt_lookup_port(const char *name) | |
2683 | { | |
2684 | struct ib_device *dev; | |
2685 | struct srpt_device *sdev; | |
2686 | struct srpt_port *sport; | |
2687 | int i; | |
2688 | ||
2689 | list_for_each_entry(sdev, &srpt_dev_list, list) { | |
2690 | dev = sdev->device; | |
2691 | if (!dev) | |
2692 | continue; | |
2693 | ||
2694 | for (i = 0; i < dev->phys_port_cnt; i++) { | |
2695 | sport = &sdev->port[i]; | |
2696 | ||
2697 | if (!strcmp(sport->port_guid, name)) | |
2698 | return sport; | |
2699 | } | |
2700 | } | |
2701 | ||
2702 | return NULL; | |
2703 | } | |
2704 | ||
2705 | static struct srpt_port *srpt_lookup_port(const char *name) | |
2706 | { | |
2707 | struct srpt_port *sport; | |
2708 | ||
2709 | spin_lock(&srpt_dev_lock); | |
2710 | sport = __srpt_lookup_port(name); | |
2711 | spin_unlock(&srpt_dev_lock); | |
2712 | ||
2713 | return sport; | |
2714 | } | |
2715 | ||
2716 | /** | |
2717 | * srpt_add_one() - Infiniband device addition callback function. | |
2718 | */ | |
2719 | static void srpt_add_one(struct ib_device *device) | |
2720 | { | |
2721 | struct srpt_device *sdev; | |
2722 | struct srpt_port *sport; | |
2723 | struct ib_srq_init_attr srq_attr; | |
2724 | int i; | |
2725 | ||
2726 | pr_debug("device = %p, device->dma_ops = %p\n", device, | |
2727 | device->dma_ops); | |
2728 | ||
9d2aa2b4 | 2729 | sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); |
a42d985b BVA |
2730 | if (!sdev) |
2731 | goto err; | |
2732 | ||
2733 | sdev->device = device; | |
2734 | INIT_LIST_HEAD(&sdev->rch_list); | |
2735 | init_waitqueue_head(&sdev->ch_releaseQ); | |
2736 | spin_lock_init(&sdev->spinlock); | |
2737 | ||
a42d985b BVA |
2738 | sdev->pd = ib_alloc_pd(device); |
2739 | if (IS_ERR(sdev->pd)) | |
2740 | goto free_dev; | |
2741 | ||
4a061b28 | 2742 | sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr); |
a42d985b BVA |
2743 | |
2744 | srq_attr.event_handler = srpt_srq_event; | |
2745 | srq_attr.srq_context = (void *)sdev; | |
2746 | srq_attr.attr.max_wr = sdev->srq_size; | |
2747 | srq_attr.attr.max_sge = 1; | |
2748 | srq_attr.attr.srq_limit = 0; | |
6f360336 | 2749 | srq_attr.srq_type = IB_SRQT_BASIC; |
a42d985b BVA |
2750 | |
2751 | sdev->srq = ib_create_srq(sdev->pd, &srq_attr); | |
2752 | if (IS_ERR(sdev->srq)) | |
5a783956 | 2753 | goto err_pd; |
a42d985b BVA |
2754 | |
2755 | pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n", | |
4a061b28 | 2756 | __func__, sdev->srq_size, sdev->device->attrs.max_srq_wr, |
a42d985b BVA |
2757 | device->name); |
2758 | ||
2759 | if (!srpt_service_guid) | |
2760 | srpt_service_guid = be64_to_cpu(device->node_guid); | |
2761 | ||
2762 | sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev); | |
2763 | if (IS_ERR(sdev->cm_id)) | |
2764 | goto err_srq; | |
2765 | ||
2766 | /* print out target login information */ | |
2767 | pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx," | |
2768 | "pkey=ffff,service_id=%016llx\n", srpt_service_guid, | |
2769 | srpt_service_guid, srpt_service_guid); | |
2770 | ||
2771 | /* | |
2772 | * We do not have a consistent service_id (ie. also id_ext of target_id) | |
2773 | * to identify this target. We currently use the guid of the first HCA | |
2774 | * in the system as service_id; therefore, the target_id will change | |
2775 | * if this HCA is gone bad and replaced by different HCA | |
2776 | */ | |
73fec7fd | 2777 | if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0)) |
a42d985b BVA |
2778 | goto err_cm; |
2779 | ||
2780 | INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device, | |
2781 | srpt_event_handler); | |
2782 | if (ib_register_event_handler(&sdev->event_handler)) | |
2783 | goto err_cm; | |
2784 | ||
2785 | sdev->ioctx_ring = (struct srpt_recv_ioctx **) | |
2786 | srpt_alloc_ioctx_ring(sdev, sdev->srq_size, | |
2787 | sizeof(*sdev->ioctx_ring[0]), | |
2788 | srp_max_req_size, DMA_FROM_DEVICE); | |
2789 | if (!sdev->ioctx_ring) | |
2790 | goto err_event; | |
2791 | ||
2792 | for (i = 0; i < sdev->srq_size; ++i) | |
2793 | srpt_post_recv(sdev, sdev->ioctx_ring[i]); | |
2794 | ||
f225066b | 2795 | WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port)); |
a42d985b BVA |
2796 | |
2797 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
2798 | sport = &sdev->port[i - 1]; | |
2799 | sport->sdev = sdev; | |
2800 | sport->port = i; | |
2801 | sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE; | |
2802 | sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE; | |
2803 | sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE; | |
2804 | INIT_WORK(&sport->work, srpt_refresh_port_work); | |
a42d985b BVA |
2805 | |
2806 | if (srpt_refresh_port(sport)) { | |
9f5d32af | 2807 | pr_err("MAD registration failed for %s-%d.\n", |
f68cba4e | 2808 | sdev->device->name, i); |
a42d985b BVA |
2809 | goto err_ring; |
2810 | } | |
2811 | snprintf(sport->port_guid, sizeof(sport->port_guid), | |
2812 | "0x%016llx%016llx", | |
2813 | be64_to_cpu(sport->gid.global.subnet_prefix), | |
2814 | be64_to_cpu(sport->gid.global.interface_id)); | |
2815 | } | |
2816 | ||
2817 | spin_lock(&srpt_dev_lock); | |
2818 | list_add_tail(&sdev->list, &srpt_dev_list); | |
2819 | spin_unlock(&srpt_dev_lock); | |
2820 | ||
2821 | out: | |
2822 | ib_set_client_data(device, &srpt_client, sdev); | |
2823 | pr_debug("added %s.\n", device->name); | |
2824 | return; | |
2825 | ||
2826 | err_ring: | |
2827 | srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, | |
2828 | sdev->srq_size, srp_max_req_size, | |
2829 | DMA_FROM_DEVICE); | |
2830 | err_event: | |
2831 | ib_unregister_event_handler(&sdev->event_handler); | |
2832 | err_cm: | |
2833 | ib_destroy_cm_id(sdev->cm_id); | |
2834 | err_srq: | |
2835 | ib_destroy_srq(sdev->srq); | |
a42d985b BVA |
2836 | err_pd: |
2837 | ib_dealloc_pd(sdev->pd); | |
2838 | free_dev: | |
2839 | kfree(sdev); | |
2840 | err: | |
2841 | sdev = NULL; | |
9f5d32af | 2842 | pr_info("%s(%s) failed.\n", __func__, device->name); |
a42d985b BVA |
2843 | goto out; |
2844 | } | |
2845 | ||
2846 | /** | |
2847 | * srpt_remove_one() - InfiniBand device removal callback function. | |
2848 | */ | |
7c1eb45a | 2849 | static void srpt_remove_one(struct ib_device *device, void *client_data) |
a42d985b | 2850 | { |
7c1eb45a | 2851 | struct srpt_device *sdev = client_data; |
a42d985b BVA |
2852 | int i; |
2853 | ||
a42d985b | 2854 | if (!sdev) { |
9f5d32af | 2855 | pr_info("%s(%s): nothing to do.\n", __func__, device->name); |
a42d985b BVA |
2856 | return; |
2857 | } | |
2858 | ||
2859 | srpt_unregister_mad_agent(sdev); | |
2860 | ||
2861 | ib_unregister_event_handler(&sdev->event_handler); | |
2862 | ||
2863 | /* Cancel any work queued by the just unregistered IB event handler. */ | |
2864 | for (i = 0; i < sdev->device->phys_port_cnt; i++) | |
2865 | cancel_work_sync(&sdev->port[i].work); | |
2866 | ||
2867 | ib_destroy_cm_id(sdev->cm_id); | |
2868 | ||
2869 | /* | |
2870 | * Unregistering a target must happen after destroying sdev->cm_id | |
2871 | * such that no new SRP_LOGIN_REQ information units can arrive while | |
2872 | * destroying the target. | |
2873 | */ | |
2874 | spin_lock(&srpt_dev_lock); | |
2875 | list_del(&sdev->list); | |
2876 | spin_unlock(&srpt_dev_lock); | |
2877 | srpt_release_sdev(sdev); | |
2878 | ||
2879 | ib_destroy_srq(sdev->srq); | |
a42d985b BVA |
2880 | ib_dealloc_pd(sdev->pd); |
2881 | ||
2882 | srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, | |
2883 | sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE); | |
2884 | sdev->ioctx_ring = NULL; | |
2885 | kfree(sdev); | |
2886 | } | |
2887 | ||
2888 | static struct ib_client srpt_client = { | |
2889 | .name = DRV_NAME, | |
2890 | .add = srpt_add_one, | |
2891 | .remove = srpt_remove_one | |
2892 | }; | |
2893 | ||
2894 | static int srpt_check_true(struct se_portal_group *se_tpg) | |
2895 | { | |
2896 | return 1; | |
2897 | } | |
2898 | ||
2899 | static int srpt_check_false(struct se_portal_group *se_tpg) | |
2900 | { | |
2901 | return 0; | |
2902 | } | |
2903 | ||
2904 | static char *srpt_get_fabric_name(void) | |
2905 | { | |
2906 | return "srpt"; | |
2907 | } | |
2908 | ||
a42d985b BVA |
2909 | static char *srpt_get_fabric_wwn(struct se_portal_group *tpg) |
2910 | { | |
2911 | struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1); | |
2912 | ||
2913 | return sport->port_guid; | |
2914 | } | |
2915 | ||
2916 | static u16 srpt_get_tag(struct se_portal_group *tpg) | |
2917 | { | |
2918 | return 1; | |
2919 | } | |
2920 | ||
a42d985b BVA |
2921 | static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg) |
2922 | { | |
2923 | return 1; | |
2924 | } | |
2925 | ||
2926 | static void srpt_release_cmd(struct se_cmd *se_cmd) | |
2927 | { | |
9474b043 NB |
2928 | struct srpt_send_ioctx *ioctx = container_of(se_cmd, |
2929 | struct srpt_send_ioctx, cmd); | |
2930 | struct srpt_rdma_ch *ch = ioctx->ch; | |
2931 | unsigned long flags; | |
2932 | ||
2933 | WARN_ON(ioctx->state != SRPT_STATE_DONE); | |
2934 | WARN_ON(ioctx->mapped_sg_count != 0); | |
2935 | ||
2936 | if (ioctx->n_rbuf > 1) { | |
2937 | kfree(ioctx->rbufs); | |
2938 | ioctx->rbufs = NULL; | |
2939 | ioctx->n_rbuf = 0; | |
2940 | } | |
2941 | ||
2942 | spin_lock_irqsave(&ch->spinlock, flags); | |
2943 | list_add(&ioctx->free_list, &ch->free_list); | |
2944 | spin_unlock_irqrestore(&ch->spinlock, flags); | |
a42d985b BVA |
2945 | } |
2946 | ||
a42d985b BVA |
2947 | /** |
2948 | * srpt_close_session() - Forcibly close a session. | |
2949 | * | |
2950 | * Callback function invoked by the TCM core to clean up sessions associated | |
2951 | * with a node ACL when the user invokes | |
2952 | * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
2953 | */ | |
2954 | static void srpt_close_session(struct se_session *se_sess) | |
2955 | { | |
2956 | DECLARE_COMPLETION_ONSTACK(release_done); | |
f108f0f6 BVA |
2957 | struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr; |
2958 | struct srpt_device *sdev = ch->sport->sdev; | |
2959 | bool wait; | |
a42d985b | 2960 | |
f108f0f6 BVA |
2961 | pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num, |
2962 | ch->state); | |
a42d985b | 2963 | |
a42d985b BVA |
2964 | spin_lock_irq(&sdev->spinlock); |
2965 | BUG_ON(ch->release_done); | |
2966 | ch->release_done = &release_done; | |
f108f0f6 | 2967 | wait = !list_empty(&ch->list); |
a42d985b BVA |
2968 | __srpt_close_ch(ch); |
2969 | spin_unlock_irq(&sdev->spinlock); | |
2970 | ||
f108f0f6 BVA |
2971 | if (!wait) |
2972 | return; | |
2973 | ||
2974 | while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0) | |
2975 | pr_info("%s(%s-%d state %d): still waiting ...\n", __func__, | |
2976 | ch->sess_name, ch->qp->qp_num, ch->state); | |
a42d985b BVA |
2977 | } |
2978 | ||
a42d985b BVA |
2979 | /** |
2980 | * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB). | |
2981 | * | |
2982 | * A quote from RFC 4455 (SCSI-MIB) about this MIB object: | |
2983 | * This object represents an arbitrary integer used to uniquely identify a | |
2984 | * particular attached remote initiator port to a particular SCSI target port | |
2985 | * within a particular SCSI target device within a particular SCSI instance. | |
2986 | */ | |
2987 | static u32 srpt_sess_get_index(struct se_session *se_sess) | |
2988 | { | |
2989 | return 0; | |
2990 | } | |
2991 | ||
2992 | static void srpt_set_default_node_attrs(struct se_node_acl *nacl) | |
2993 | { | |
2994 | } | |
2995 | ||
a42d985b BVA |
2996 | /* Note: only used from inside debug printk's by the TCM core. */ |
2997 | static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd) | |
2998 | { | |
2999 | struct srpt_send_ioctx *ioctx; | |
3000 | ||
3001 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
3002 | return srpt_get_cmd_state(ioctx); | |
3003 | } | |
3004 | ||
a42d985b BVA |
3005 | /** |
3006 | * srpt_parse_i_port_id() - Parse an initiator port ID. | |
3007 | * @name: ASCII representation of a 128-bit initiator port ID. | |
3008 | * @i_port_id: Binary 128-bit port ID. | |
3009 | */ | |
3010 | static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name) | |
3011 | { | |
3012 | const char *p; | |
3013 | unsigned len, count, leading_zero_bytes; | |
3014 | int ret, rc; | |
3015 | ||
3016 | p = name; | |
b60459f0 | 3017 | if (strncasecmp(p, "0x", 2) == 0) |
a42d985b BVA |
3018 | p += 2; |
3019 | ret = -EINVAL; | |
3020 | len = strlen(p); | |
3021 | if (len % 2) | |
3022 | goto out; | |
3023 | count = min(len / 2, 16U); | |
3024 | leading_zero_bytes = 16 - count; | |
3025 | memset(i_port_id, 0, leading_zero_bytes); | |
3026 | rc = hex2bin(i_port_id + leading_zero_bytes, p, count); | |
3027 | if (rc < 0) | |
3028 | pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc); | |
3029 | ret = 0; | |
3030 | out: | |
3031 | return ret; | |
3032 | } | |
3033 | ||
3034 | /* | |
3035 | * configfs callback function invoked for | |
3036 | * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
3037 | */ | |
c7d6a803 | 3038 | static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name) |
a42d985b | 3039 | { |
a42d985b BVA |
3040 | u8 i_port_id[16]; |
3041 | ||
3042 | if (srpt_parse_i_port_id(i_port_id, name) < 0) { | |
9f5d32af | 3043 | pr_err("invalid initiator port ID %s\n", name); |
c7d6a803 | 3044 | return -EINVAL; |
a42d985b | 3045 | } |
c7d6a803 | 3046 | return 0; |
a42d985b BVA |
3047 | } |
3048 | ||
2eafd729 CH |
3049 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item, |
3050 | char *page) | |
a42d985b | 3051 | { |
2eafd729 | 3052 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3053 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3054 | ||
3055 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size); | |
3056 | } | |
3057 | ||
2eafd729 CH |
3058 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item, |
3059 | const char *page, size_t count) | |
a42d985b | 3060 | { |
2eafd729 | 3061 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3062 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3063 | unsigned long val; | |
3064 | int ret; | |
3065 | ||
9d8abf45 | 3066 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3067 | if (ret < 0) { |
9d8abf45 | 3068 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3069 | return -EINVAL; |
3070 | } | |
3071 | if (val > MAX_SRPT_RDMA_SIZE) { | |
3072 | pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val, | |
3073 | MAX_SRPT_RDMA_SIZE); | |
3074 | return -EINVAL; | |
3075 | } | |
3076 | if (val < DEFAULT_MAX_RDMA_SIZE) { | |
3077 | pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n", | |
3078 | val, DEFAULT_MAX_RDMA_SIZE); | |
3079 | return -EINVAL; | |
3080 | } | |
3081 | sport->port_attrib.srp_max_rdma_size = val; | |
3082 | ||
3083 | return count; | |
3084 | } | |
3085 | ||
2eafd729 CH |
3086 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item, |
3087 | char *page) | |
a42d985b | 3088 | { |
2eafd729 | 3089 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3090 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3091 | ||
3092 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size); | |
3093 | } | |
3094 | ||
2eafd729 CH |
3095 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item, |
3096 | const char *page, size_t count) | |
a42d985b | 3097 | { |
2eafd729 | 3098 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3099 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3100 | unsigned long val; | |
3101 | int ret; | |
3102 | ||
9d8abf45 | 3103 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3104 | if (ret < 0) { |
9d8abf45 | 3105 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3106 | return -EINVAL; |
3107 | } | |
3108 | if (val > MAX_SRPT_RSP_SIZE) { | |
3109 | pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val, | |
3110 | MAX_SRPT_RSP_SIZE); | |
3111 | return -EINVAL; | |
3112 | } | |
3113 | if (val < MIN_MAX_RSP_SIZE) { | |
3114 | pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val, | |
3115 | MIN_MAX_RSP_SIZE); | |
3116 | return -EINVAL; | |
3117 | } | |
3118 | sport->port_attrib.srp_max_rsp_size = val; | |
3119 | ||
3120 | return count; | |
3121 | } | |
3122 | ||
2eafd729 CH |
3123 | static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item, |
3124 | char *page) | |
a42d985b | 3125 | { |
2eafd729 | 3126 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3127 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3128 | ||
3129 | return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size); | |
3130 | } | |
3131 | ||
2eafd729 CH |
3132 | static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item, |
3133 | const char *page, size_t count) | |
a42d985b | 3134 | { |
2eafd729 | 3135 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3136 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3137 | unsigned long val; | |
3138 | int ret; | |
3139 | ||
9d8abf45 | 3140 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3141 | if (ret < 0) { |
9d8abf45 | 3142 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3143 | return -EINVAL; |
3144 | } | |
3145 | if (val > MAX_SRPT_SRQ_SIZE) { | |
3146 | pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val, | |
3147 | MAX_SRPT_SRQ_SIZE); | |
3148 | return -EINVAL; | |
3149 | } | |
3150 | if (val < MIN_SRPT_SRQ_SIZE) { | |
3151 | pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val, | |
3152 | MIN_SRPT_SRQ_SIZE); | |
3153 | return -EINVAL; | |
3154 | } | |
3155 | sport->port_attrib.srp_sq_size = val; | |
3156 | ||
3157 | return count; | |
3158 | } | |
3159 | ||
2eafd729 CH |
3160 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size); |
3161 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size); | |
3162 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size); | |
a42d985b BVA |
3163 | |
3164 | static struct configfs_attribute *srpt_tpg_attrib_attrs[] = { | |
2eafd729 CH |
3165 | &srpt_tpg_attrib_attr_srp_max_rdma_size, |
3166 | &srpt_tpg_attrib_attr_srp_max_rsp_size, | |
3167 | &srpt_tpg_attrib_attr_srp_sq_size, | |
a42d985b BVA |
3168 | NULL, |
3169 | }; | |
3170 | ||
2eafd729 | 3171 | static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page) |
a42d985b | 3172 | { |
2eafd729 | 3173 | struct se_portal_group *se_tpg = to_tpg(item); |
a42d985b BVA |
3174 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3175 | ||
3176 | return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0); | |
3177 | } | |
3178 | ||
2eafd729 CH |
3179 | static ssize_t srpt_tpg_enable_store(struct config_item *item, |
3180 | const char *page, size_t count) | |
a42d985b | 3181 | { |
2eafd729 | 3182 | struct se_portal_group *se_tpg = to_tpg(item); |
a42d985b BVA |
3183 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3184 | unsigned long tmp; | |
3185 | int ret; | |
3186 | ||
9d8abf45 | 3187 | ret = kstrtoul(page, 0, &tmp); |
a42d985b | 3188 | if (ret < 0) { |
9f5d32af | 3189 | pr_err("Unable to extract srpt_tpg_store_enable\n"); |
a42d985b BVA |
3190 | return -EINVAL; |
3191 | } | |
3192 | ||
3193 | if ((tmp != 0) && (tmp != 1)) { | |
9f5d32af | 3194 | pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp); |
a42d985b BVA |
3195 | return -EINVAL; |
3196 | } | |
3197 | if (tmp == 1) | |
3198 | sport->enabled = true; | |
3199 | else | |
3200 | sport->enabled = false; | |
3201 | ||
3202 | return count; | |
3203 | } | |
3204 | ||
2eafd729 | 3205 | CONFIGFS_ATTR(srpt_tpg_, enable); |
a42d985b BVA |
3206 | |
3207 | static struct configfs_attribute *srpt_tpg_attrs[] = { | |
2eafd729 | 3208 | &srpt_tpg_attr_enable, |
a42d985b BVA |
3209 | NULL, |
3210 | }; | |
3211 | ||
3212 | /** | |
3213 | * configfs callback invoked for | |
3214 | * mkdir /sys/kernel/config/target/$driver/$port/$tpg | |
3215 | */ | |
3216 | static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn, | |
3217 | struct config_group *group, | |
3218 | const char *name) | |
3219 | { | |
3220 | struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn); | |
3221 | int res; | |
3222 | ||
3223 | /* Initialize sport->port_wwn and sport->port_tpg_1 */ | |
bc0c94b1 | 3224 | res = core_tpg_register(&sport->port_wwn, &sport->port_tpg_1, SCSI_PROTOCOL_SRP); |
a42d985b BVA |
3225 | if (res) |
3226 | return ERR_PTR(res); | |
3227 | ||
3228 | return &sport->port_tpg_1; | |
3229 | } | |
3230 | ||
3231 | /** | |
3232 | * configfs callback invoked for | |
3233 | * rmdir /sys/kernel/config/target/$driver/$port/$tpg | |
3234 | */ | |
3235 | static void srpt_drop_tpg(struct se_portal_group *tpg) | |
3236 | { | |
3237 | struct srpt_port *sport = container_of(tpg, | |
3238 | struct srpt_port, port_tpg_1); | |
3239 | ||
3240 | sport->enabled = false; | |
3241 | core_tpg_deregister(&sport->port_tpg_1); | |
3242 | } | |
3243 | ||
3244 | /** | |
3245 | * configfs callback invoked for | |
3246 | * mkdir /sys/kernel/config/target/$driver/$port | |
3247 | */ | |
3248 | static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf, | |
3249 | struct config_group *group, | |
3250 | const char *name) | |
3251 | { | |
3252 | struct srpt_port *sport; | |
3253 | int ret; | |
3254 | ||
3255 | sport = srpt_lookup_port(name); | |
3256 | pr_debug("make_tport(%s)\n", name); | |
3257 | ret = -EINVAL; | |
3258 | if (!sport) | |
3259 | goto err; | |
3260 | ||
3261 | return &sport->port_wwn; | |
3262 | ||
3263 | err: | |
3264 | return ERR_PTR(ret); | |
3265 | } | |
3266 | ||
3267 | /** | |
3268 | * configfs callback invoked for | |
3269 | * rmdir /sys/kernel/config/target/$driver/$port | |
3270 | */ | |
3271 | static void srpt_drop_tport(struct se_wwn *wwn) | |
3272 | { | |
3273 | struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn); | |
3274 | ||
3275 | pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item)); | |
3276 | } | |
3277 | ||
2eafd729 | 3278 | static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf) |
a42d985b BVA |
3279 | { |
3280 | return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION); | |
3281 | } | |
3282 | ||
2eafd729 | 3283 | CONFIGFS_ATTR_RO(srpt_wwn_, version); |
a42d985b BVA |
3284 | |
3285 | static struct configfs_attribute *srpt_wwn_attrs[] = { | |
2eafd729 | 3286 | &srpt_wwn_attr_version, |
a42d985b BVA |
3287 | NULL, |
3288 | }; | |
3289 | ||
9ac8928e CH |
3290 | static const struct target_core_fabric_ops srpt_template = { |
3291 | .module = THIS_MODULE, | |
3292 | .name = "srpt", | |
a42d985b | 3293 | .get_fabric_name = srpt_get_fabric_name, |
a42d985b BVA |
3294 | .tpg_get_wwn = srpt_get_fabric_wwn, |
3295 | .tpg_get_tag = srpt_get_tag, | |
a42d985b BVA |
3296 | .tpg_check_demo_mode = srpt_check_false, |
3297 | .tpg_check_demo_mode_cache = srpt_check_true, | |
3298 | .tpg_check_demo_mode_write_protect = srpt_check_true, | |
3299 | .tpg_check_prod_mode_write_protect = srpt_check_false, | |
a42d985b BVA |
3300 | .tpg_get_inst_index = srpt_tpg_get_inst_index, |
3301 | .release_cmd = srpt_release_cmd, | |
3302 | .check_stop_free = srpt_check_stop_free, | |
3303 | .shutdown_session = srpt_shutdown_session, | |
3304 | .close_session = srpt_close_session, | |
a42d985b BVA |
3305 | .sess_get_index = srpt_sess_get_index, |
3306 | .sess_get_initiator_sid = NULL, | |
3307 | .write_pending = srpt_write_pending, | |
3308 | .write_pending_status = srpt_write_pending_status, | |
3309 | .set_default_node_attributes = srpt_set_default_node_attrs, | |
a42d985b | 3310 | .get_cmd_state = srpt_get_tcm_cmd_state, |
b79fafac | 3311 | .queue_data_in = srpt_queue_data_in, |
a42d985b | 3312 | .queue_status = srpt_queue_status, |
b79fafac | 3313 | .queue_tm_rsp = srpt_queue_tm_rsp, |
131e6abc | 3314 | .aborted_task = srpt_aborted_task, |
a42d985b BVA |
3315 | /* |
3316 | * Setup function pointers for generic logic in | |
3317 | * target_core_fabric_configfs.c | |
3318 | */ | |
3319 | .fabric_make_wwn = srpt_make_tport, | |
3320 | .fabric_drop_wwn = srpt_drop_tport, | |
3321 | .fabric_make_tpg = srpt_make_tpg, | |
3322 | .fabric_drop_tpg = srpt_drop_tpg, | |
c7d6a803 | 3323 | .fabric_init_nodeacl = srpt_init_nodeacl, |
9ac8928e CH |
3324 | |
3325 | .tfc_wwn_attrs = srpt_wwn_attrs, | |
3326 | .tfc_tpg_base_attrs = srpt_tpg_attrs, | |
3327 | .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs, | |
a42d985b BVA |
3328 | }; |
3329 | ||
3330 | /** | |
3331 | * srpt_init_module() - Kernel module initialization. | |
3332 | * | |
3333 | * Note: Since ib_register_client() registers callback functions, and since at | |
3334 | * least one of these callback functions (srpt_add_one()) calls target core | |
3335 | * functions, this driver must be registered with the target core before | |
3336 | * ib_register_client() is called. | |
3337 | */ | |
3338 | static int __init srpt_init_module(void) | |
3339 | { | |
3340 | int ret; | |
3341 | ||
3342 | ret = -EINVAL; | |
3343 | if (srp_max_req_size < MIN_MAX_REQ_SIZE) { | |
9f5d32af | 3344 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3345 | " srp_max_req_size -- must be at least %d.\n", |
3346 | srp_max_req_size, MIN_MAX_REQ_SIZE); | |
3347 | goto out; | |
3348 | } | |
3349 | ||
3350 | if (srpt_srq_size < MIN_SRPT_SRQ_SIZE | |
3351 | || srpt_srq_size > MAX_SRPT_SRQ_SIZE) { | |
9f5d32af | 3352 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3353 | " srpt_srq_size -- must be in the range [%d..%d].\n", |
3354 | srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE); | |
3355 | goto out; | |
3356 | } | |
3357 | ||
9ac8928e CH |
3358 | ret = target_register_template(&srpt_template); |
3359 | if (ret) | |
a42d985b | 3360 | goto out; |
a42d985b BVA |
3361 | |
3362 | ret = ib_register_client(&srpt_client); | |
3363 | if (ret) { | |
9f5d32af | 3364 | pr_err("couldn't register IB client\n"); |
a42d985b BVA |
3365 | goto out_unregister_target; |
3366 | } | |
3367 | ||
3368 | return 0; | |
3369 | ||
3370 | out_unregister_target: | |
9ac8928e | 3371 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3372 | out: |
3373 | return ret; | |
3374 | } | |
3375 | ||
3376 | static void __exit srpt_cleanup_module(void) | |
3377 | { | |
3378 | ib_unregister_client(&srpt_client); | |
9ac8928e | 3379 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3380 | } |
3381 | ||
3382 | module_init(srpt_init_module); | |
3383 | module_exit(srpt_cleanup_module); |