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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); |
aaf45bd8 | 95 | static void srpt_free_ch(struct kref *kref); |
a42d985b | 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); | |
387add46 | 99 | static void srpt_process_wait_list(struct srpt_rdma_ch *ch); |
a42d985b | 100 | |
f130c220 BVA |
101 | /* |
102 | * The only allowed channel state changes are those that change the channel | |
103 | * state into a state with a higher numerical value. Hence the new > prev test. | |
a42d985b | 104 | */ |
f130c220 | 105 | static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new) |
a42d985b BVA |
106 | { |
107 | unsigned long flags; | |
108 | enum rdma_ch_state prev; | |
f130c220 | 109 | bool changed = false; |
a42d985b BVA |
110 | |
111 | spin_lock_irqsave(&ch->spinlock, flags); | |
112 | prev = ch->state; | |
f130c220 | 113 | if (new > prev) { |
a42d985b | 114 | ch->state = new; |
f130c220 BVA |
115 | changed = true; |
116 | } | |
a42d985b | 117 | spin_unlock_irqrestore(&ch->spinlock, flags); |
f130c220 BVA |
118 | |
119 | return changed; | |
a42d985b BVA |
120 | } |
121 | ||
122 | /** | |
123 | * srpt_event_handler() - Asynchronous IB event callback function. | |
124 | * | |
125 | * Callback function called by the InfiniBand core when an asynchronous IB | |
126 | * event occurs. This callback may occur in interrupt context. See also | |
127 | * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand | |
128 | * Architecture Specification. | |
129 | */ | |
130 | static void srpt_event_handler(struct ib_event_handler *handler, | |
131 | struct ib_event *event) | |
132 | { | |
133 | struct srpt_device *sdev; | |
134 | struct srpt_port *sport; | |
135 | ||
136 | sdev = ib_get_client_data(event->device, &srpt_client); | |
137 | if (!sdev || sdev->device != event->device) | |
138 | return; | |
139 | ||
140 | pr_debug("ASYNC event= %d on device= %s\n", event->event, | |
f68cba4e | 141 | sdev->device->name); |
a42d985b BVA |
142 | |
143 | switch (event->event) { | |
144 | case IB_EVENT_PORT_ERR: | |
145 | if (event->element.port_num <= sdev->device->phys_port_cnt) { | |
146 | sport = &sdev->port[event->element.port_num - 1]; | |
147 | sport->lid = 0; | |
148 | sport->sm_lid = 0; | |
149 | } | |
150 | break; | |
151 | case IB_EVENT_PORT_ACTIVE: | |
152 | case IB_EVENT_LID_CHANGE: | |
153 | case IB_EVENT_PKEY_CHANGE: | |
154 | case IB_EVENT_SM_CHANGE: | |
155 | case IB_EVENT_CLIENT_REREGISTER: | |
2aa1cf64 | 156 | case IB_EVENT_GID_CHANGE: |
a42d985b BVA |
157 | /* Refresh port data asynchronously. */ |
158 | if (event->element.port_num <= sdev->device->phys_port_cnt) { | |
159 | sport = &sdev->port[event->element.port_num - 1]; | |
160 | if (!sport->lid && !sport->sm_lid) | |
161 | schedule_work(&sport->work); | |
162 | } | |
163 | break; | |
164 | default: | |
9f5d32af | 165 | pr_err("received unrecognized IB event %d\n", |
a42d985b BVA |
166 | event->event); |
167 | break; | |
168 | } | |
169 | } | |
170 | ||
171 | /** | |
172 | * srpt_srq_event() - SRQ event callback function. | |
173 | */ | |
174 | static void srpt_srq_event(struct ib_event *event, void *ctx) | |
175 | { | |
9f5d32af | 176 | pr_info("SRQ event %d\n", event->event); |
a42d985b BVA |
177 | } |
178 | ||
aaf45bd8 BVA |
179 | static const char *get_ch_state_name(enum rdma_ch_state s) |
180 | { | |
181 | switch (s) { | |
182 | case CH_CONNECTING: | |
183 | return "connecting"; | |
184 | case CH_LIVE: | |
185 | return "live"; | |
186 | case CH_DISCONNECTING: | |
187 | return "disconnecting"; | |
188 | case CH_DRAINING: | |
189 | return "draining"; | |
190 | case CH_DISCONNECTED: | |
191 | return "disconnected"; | |
192 | } | |
193 | return "???"; | |
194 | } | |
195 | ||
a42d985b BVA |
196 | /** |
197 | * srpt_qp_event() - QP event callback function. | |
198 | */ | |
199 | static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch) | |
200 | { | |
201 | pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n", | |
33912d73 | 202 | event->event, ch->cm_id, ch->sess_name, ch->state); |
a42d985b BVA |
203 | |
204 | switch (event->event) { | |
205 | case IB_EVENT_COMM_EST: | |
206 | ib_cm_notify(ch->cm_id, event->event); | |
207 | break; | |
208 | case IB_EVENT_QP_LAST_WQE_REACHED: | |
aaf45bd8 BVA |
209 | pr_debug("%s-%d, state %s: received Last WQE event.\n", |
210 | ch->sess_name, ch->qp->qp_num, | |
211 | get_ch_state_name(ch->state)); | |
a42d985b BVA |
212 | break; |
213 | default: | |
9f5d32af | 214 | pr_err("received unrecognized IB QP event %d\n", event->event); |
a42d985b BVA |
215 | break; |
216 | } | |
217 | } | |
218 | ||
219 | /** | |
220 | * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure. | |
221 | * | |
222 | * @slot: one-based slot number. | |
223 | * @value: four-bit value. | |
224 | * | |
225 | * Copies the lowest four bits of value in element slot of the array of four | |
226 | * bit elements called c_list (controller list). The index slot is one-based. | |
227 | */ | |
228 | static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value) | |
229 | { | |
230 | u16 id; | |
231 | u8 tmp; | |
232 | ||
233 | id = (slot - 1) / 2; | |
234 | if (slot & 0x1) { | |
235 | tmp = c_list[id] & 0xf; | |
236 | c_list[id] = (value << 4) | tmp; | |
237 | } else { | |
238 | tmp = c_list[id] & 0xf0; | |
239 | c_list[id] = (value & 0xf) | tmp; | |
240 | } | |
241 | } | |
242 | ||
243 | /** | |
244 | * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram. | |
245 | * | |
246 | * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture | |
247 | * Specification. | |
248 | */ | |
249 | static void srpt_get_class_port_info(struct ib_dm_mad *mad) | |
250 | { | |
251 | struct ib_class_port_info *cif; | |
252 | ||
253 | cif = (struct ib_class_port_info *)mad->data; | |
9d2aa2b4 | 254 | memset(cif, 0, sizeof(*cif)); |
a42d985b BVA |
255 | cif->base_version = 1; |
256 | cif->class_version = 1; | |
257 | cif->resp_time_value = 20; | |
258 | ||
259 | mad->mad_hdr.status = 0; | |
260 | } | |
261 | ||
262 | /** | |
263 | * srpt_get_iou() - Write IOUnitInfo to a management datagram. | |
264 | * | |
265 | * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture | |
266 | * Specification. See also section B.7, table B.6 in the SRP r16a document. | |
267 | */ | |
268 | static void srpt_get_iou(struct ib_dm_mad *mad) | |
269 | { | |
270 | struct ib_dm_iou_info *ioui; | |
271 | u8 slot; | |
272 | int i; | |
273 | ||
274 | ioui = (struct ib_dm_iou_info *)mad->data; | |
b356c1c1 | 275 | ioui->change_id = cpu_to_be16(1); |
a42d985b BVA |
276 | ioui->max_controllers = 16; |
277 | ||
278 | /* set present for slot 1 and empty for the rest */ | |
279 | srpt_set_ioc(ioui->controller_list, 1, 1); | |
280 | for (i = 1, slot = 2; i < 16; i++, slot++) | |
281 | srpt_set_ioc(ioui->controller_list, slot, 0); | |
282 | ||
283 | mad->mad_hdr.status = 0; | |
284 | } | |
285 | ||
286 | /** | |
287 | * srpt_get_ioc() - Write IOControllerprofile to a management datagram. | |
288 | * | |
289 | * See also section 16.3.3.4 IOControllerProfile in the InfiniBand | |
290 | * Architecture Specification. See also section B.7, table B.7 in the SRP | |
291 | * r16a document. | |
292 | */ | |
293 | static void srpt_get_ioc(struct srpt_port *sport, u32 slot, | |
294 | struct ib_dm_mad *mad) | |
295 | { | |
296 | struct srpt_device *sdev = sport->sdev; | |
297 | struct ib_dm_ioc_profile *iocp; | |
298 | ||
299 | iocp = (struct ib_dm_ioc_profile *)mad->data; | |
300 | ||
301 | if (!slot || slot > 16) { | |
302 | mad->mad_hdr.status | |
b356c1c1 | 303 | = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
a42d985b BVA |
304 | return; |
305 | } | |
306 | ||
307 | if (slot > 2) { | |
308 | mad->mad_hdr.status | |
b356c1c1 | 309 | = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
a42d985b BVA |
310 | return; |
311 | } | |
312 | ||
9d2aa2b4 | 313 | memset(iocp, 0, sizeof(*iocp)); |
a42d985b BVA |
314 | strcpy(iocp->id_string, SRPT_ID_STRING); |
315 | iocp->guid = cpu_to_be64(srpt_service_guid); | |
4a061b28 OG |
316 | iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); |
317 | iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id); | |
318 | iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver); | |
319 | iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); | |
a42d985b | 320 | iocp->subsys_device_id = 0x0; |
b356c1c1 VT |
321 | iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS); |
322 | iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS); | |
323 | iocp->protocol = cpu_to_be16(SRP_PROTOCOL); | |
324 | iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION); | |
a42d985b BVA |
325 | iocp->send_queue_depth = cpu_to_be16(sdev->srq_size); |
326 | iocp->rdma_read_depth = 4; | |
327 | iocp->send_size = cpu_to_be32(srp_max_req_size); | |
328 | iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size, | |
329 | 1U << 24)); | |
330 | iocp->num_svc_entries = 1; | |
331 | iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC | | |
332 | SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC; | |
333 | ||
334 | mad->mad_hdr.status = 0; | |
335 | } | |
336 | ||
337 | /** | |
338 | * srpt_get_svc_entries() - Write ServiceEntries to a management datagram. | |
339 | * | |
340 | * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture | |
341 | * Specification. See also section B.7, table B.8 in the SRP r16a document. | |
342 | */ | |
343 | static void srpt_get_svc_entries(u64 ioc_guid, | |
344 | u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad) | |
345 | { | |
346 | struct ib_dm_svc_entries *svc_entries; | |
347 | ||
348 | WARN_ON(!ioc_guid); | |
349 | ||
350 | if (!slot || slot > 16) { | |
351 | mad->mad_hdr.status | |
b356c1c1 | 352 | = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
a42d985b BVA |
353 | return; |
354 | } | |
355 | ||
356 | if (slot > 2 || lo > hi || hi > 1) { | |
357 | mad->mad_hdr.status | |
b356c1c1 | 358 | = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
a42d985b BVA |
359 | return; |
360 | } | |
361 | ||
362 | svc_entries = (struct ib_dm_svc_entries *)mad->data; | |
9d2aa2b4 | 363 | memset(svc_entries, 0, sizeof(*svc_entries)); |
a42d985b BVA |
364 | svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid); |
365 | snprintf(svc_entries->service_entries[0].name, | |
366 | sizeof(svc_entries->service_entries[0].name), | |
367 | "%s%016llx", | |
368 | SRP_SERVICE_NAME_PREFIX, | |
369 | ioc_guid); | |
370 | ||
371 | mad->mad_hdr.status = 0; | |
372 | } | |
373 | ||
374 | /** | |
375 | * srpt_mgmt_method_get() - Process a received management datagram. | |
376 | * @sp: source port through which the MAD has been received. | |
377 | * @rq_mad: received MAD. | |
378 | * @rsp_mad: response MAD. | |
379 | */ | |
380 | static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad, | |
381 | struct ib_dm_mad *rsp_mad) | |
382 | { | |
383 | u16 attr_id; | |
384 | u32 slot; | |
385 | u8 hi, lo; | |
386 | ||
387 | attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id); | |
388 | switch (attr_id) { | |
389 | case DM_ATTR_CLASS_PORT_INFO: | |
390 | srpt_get_class_port_info(rsp_mad); | |
391 | break; | |
392 | case DM_ATTR_IOU_INFO: | |
393 | srpt_get_iou(rsp_mad); | |
394 | break; | |
395 | case DM_ATTR_IOC_PROFILE: | |
396 | slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); | |
397 | srpt_get_ioc(sp, slot, rsp_mad); | |
398 | break; | |
399 | case DM_ATTR_SVC_ENTRIES: | |
400 | slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); | |
401 | hi = (u8) ((slot >> 8) & 0xff); | |
402 | lo = (u8) (slot & 0xff); | |
403 | slot = (u16) ((slot >> 16) & 0xffff); | |
404 | srpt_get_svc_entries(srpt_service_guid, | |
405 | slot, hi, lo, rsp_mad); | |
406 | break; | |
407 | default: | |
408 | rsp_mad->mad_hdr.status = | |
b356c1c1 | 409 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
a42d985b BVA |
410 | break; |
411 | } | |
412 | } | |
413 | ||
414 | /** | |
415 | * srpt_mad_send_handler() - Post MAD-send callback function. | |
416 | */ | |
417 | static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent, | |
418 | struct ib_mad_send_wc *mad_wc) | |
419 | { | |
420 | ib_destroy_ah(mad_wc->send_buf->ah); | |
421 | ib_free_send_mad(mad_wc->send_buf); | |
422 | } | |
423 | ||
424 | /** | |
425 | * srpt_mad_recv_handler() - MAD reception callback function. | |
426 | */ | |
427 | static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent, | |
ca281265 | 428 | struct ib_mad_send_buf *send_buf, |
a42d985b BVA |
429 | struct ib_mad_recv_wc *mad_wc) |
430 | { | |
431 | struct srpt_port *sport = (struct srpt_port *)mad_agent->context; | |
432 | struct ib_ah *ah; | |
433 | struct ib_mad_send_buf *rsp; | |
434 | struct ib_dm_mad *dm_mad; | |
435 | ||
436 | if (!mad_wc || !mad_wc->recv_buf.mad) | |
437 | return; | |
438 | ||
439 | ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc, | |
440 | mad_wc->recv_buf.grh, mad_agent->port_num); | |
441 | if (IS_ERR(ah)) | |
442 | goto err; | |
443 | ||
444 | BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR); | |
445 | ||
446 | rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp, | |
447 | mad_wc->wc->pkey_index, 0, | |
448 | IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA, | |
da2dfaa3 IW |
449 | GFP_KERNEL, |
450 | IB_MGMT_BASE_VERSION); | |
a42d985b BVA |
451 | if (IS_ERR(rsp)) |
452 | goto err_rsp; | |
453 | ||
454 | rsp->ah = ah; | |
455 | ||
456 | dm_mad = rsp->mad; | |
9d2aa2b4 | 457 | memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad)); |
a42d985b BVA |
458 | dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP; |
459 | dm_mad->mad_hdr.status = 0; | |
460 | ||
461 | switch (mad_wc->recv_buf.mad->mad_hdr.method) { | |
462 | case IB_MGMT_METHOD_GET: | |
463 | srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad); | |
464 | break; | |
465 | case IB_MGMT_METHOD_SET: | |
466 | dm_mad->mad_hdr.status = | |
b356c1c1 | 467 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
a42d985b BVA |
468 | break; |
469 | default: | |
470 | dm_mad->mad_hdr.status = | |
b356c1c1 | 471 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD); |
a42d985b BVA |
472 | break; |
473 | } | |
474 | ||
475 | if (!ib_post_send_mad(rsp, NULL)) { | |
476 | ib_free_recv_mad(mad_wc); | |
477 | /* will destroy_ah & free_send_mad in send completion */ | |
478 | return; | |
479 | } | |
480 | ||
481 | ib_free_send_mad(rsp); | |
482 | ||
483 | err_rsp: | |
484 | ib_destroy_ah(ah); | |
485 | err: | |
486 | ib_free_recv_mad(mad_wc); | |
487 | } | |
488 | ||
489 | /** | |
490 | * srpt_refresh_port() - Configure a HCA port. | |
491 | * | |
492 | * Enable InfiniBand management datagram processing, update the cached sm_lid, | |
493 | * lid and gid values, and register a callback function for processing MADs | |
494 | * on the specified port. | |
495 | * | |
496 | * Note: It is safe to call this function more than once for the same port. | |
497 | */ | |
498 | static int srpt_refresh_port(struct srpt_port *sport) | |
499 | { | |
500 | struct ib_mad_reg_req reg_req; | |
501 | struct ib_port_modify port_modify; | |
502 | struct ib_port_attr port_attr; | |
503 | int ret; | |
504 | ||
9d2aa2b4 | 505 | memset(&port_modify, 0, sizeof(port_modify)); |
a42d985b BVA |
506 | port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; |
507 | port_modify.clr_port_cap_mask = 0; | |
508 | ||
509 | ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
510 | if (ret) | |
511 | goto err_mod_port; | |
512 | ||
513 | ret = ib_query_port(sport->sdev->device, sport->port, &port_attr); | |
514 | if (ret) | |
515 | goto err_query_port; | |
516 | ||
517 | sport->sm_lid = port_attr.sm_lid; | |
518 | sport->lid = port_attr.lid; | |
519 | ||
55ee3ab2 MB |
520 | ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid, |
521 | NULL); | |
a42d985b BVA |
522 | if (ret) |
523 | goto err_query_port; | |
524 | ||
525 | if (!sport->mad_agent) { | |
9d2aa2b4 | 526 | memset(®_req, 0, sizeof(reg_req)); |
a42d985b BVA |
527 | reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT; |
528 | reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION; | |
529 | set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask); | |
530 | set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask); | |
531 | ||
532 | sport->mad_agent = ib_register_mad_agent(sport->sdev->device, | |
533 | sport->port, | |
534 | IB_QPT_GSI, | |
535 | ®_req, 0, | |
536 | srpt_mad_send_handler, | |
537 | srpt_mad_recv_handler, | |
0f29b46d | 538 | sport, 0); |
a42d985b BVA |
539 | if (IS_ERR(sport->mad_agent)) { |
540 | ret = PTR_ERR(sport->mad_agent); | |
541 | sport->mad_agent = NULL; | |
542 | goto err_query_port; | |
543 | } | |
544 | } | |
545 | ||
546 | return 0; | |
547 | ||
548 | err_query_port: | |
549 | ||
550 | port_modify.set_port_cap_mask = 0; | |
551 | port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; | |
552 | ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
553 | ||
554 | err_mod_port: | |
555 | ||
556 | return ret; | |
557 | } | |
558 | ||
559 | /** | |
560 | * srpt_unregister_mad_agent() - Unregister MAD callback functions. | |
561 | * | |
562 | * Note: It is safe to call this function more than once for the same device. | |
563 | */ | |
564 | static void srpt_unregister_mad_agent(struct srpt_device *sdev) | |
565 | { | |
566 | struct ib_port_modify port_modify = { | |
567 | .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP, | |
568 | }; | |
569 | struct srpt_port *sport; | |
570 | int i; | |
571 | ||
572 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
573 | sport = &sdev->port[i - 1]; | |
574 | WARN_ON(sport->port != i); | |
575 | if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0) | |
9f5d32af | 576 | pr_err("disabling MAD processing failed.\n"); |
a42d985b BVA |
577 | if (sport->mad_agent) { |
578 | ib_unregister_mad_agent(sport->mad_agent); | |
579 | sport->mad_agent = NULL; | |
580 | } | |
581 | } | |
582 | } | |
583 | ||
584 | /** | |
585 | * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure. | |
586 | */ | |
587 | static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev, | |
588 | int ioctx_size, int dma_size, | |
589 | enum dma_data_direction dir) | |
590 | { | |
591 | struct srpt_ioctx *ioctx; | |
592 | ||
593 | ioctx = kmalloc(ioctx_size, GFP_KERNEL); | |
594 | if (!ioctx) | |
595 | goto err; | |
596 | ||
597 | ioctx->buf = kmalloc(dma_size, GFP_KERNEL); | |
598 | if (!ioctx->buf) | |
599 | goto err_free_ioctx; | |
600 | ||
601 | ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir); | |
602 | if (ib_dma_mapping_error(sdev->device, ioctx->dma)) | |
603 | goto err_free_buf; | |
604 | ||
605 | return ioctx; | |
606 | ||
607 | err_free_buf: | |
608 | kfree(ioctx->buf); | |
609 | err_free_ioctx: | |
610 | kfree(ioctx); | |
611 | err: | |
612 | return NULL; | |
613 | } | |
614 | ||
615 | /** | |
616 | * srpt_free_ioctx() - Free an SRPT I/O context structure. | |
617 | */ | |
618 | static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx, | |
619 | int dma_size, enum dma_data_direction dir) | |
620 | { | |
621 | if (!ioctx) | |
622 | return; | |
623 | ||
624 | ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir); | |
625 | kfree(ioctx->buf); | |
626 | kfree(ioctx); | |
627 | } | |
628 | ||
629 | /** | |
630 | * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures. | |
631 | * @sdev: Device to allocate the I/O context ring for. | |
632 | * @ring_size: Number of elements in the I/O context ring. | |
633 | * @ioctx_size: I/O context size. | |
634 | * @dma_size: DMA buffer size. | |
635 | * @dir: DMA data direction. | |
636 | */ | |
637 | static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev, | |
638 | int ring_size, int ioctx_size, | |
639 | int dma_size, enum dma_data_direction dir) | |
640 | { | |
641 | struct srpt_ioctx **ring; | |
642 | int i; | |
643 | ||
644 | WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) | |
645 | && ioctx_size != sizeof(struct srpt_send_ioctx)); | |
646 | ||
647 | ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL); | |
648 | if (!ring) | |
649 | goto out; | |
650 | for (i = 0; i < ring_size; ++i) { | |
651 | ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir); | |
652 | if (!ring[i]) | |
653 | goto err; | |
654 | ring[i]->index = i; | |
655 | } | |
656 | goto out; | |
657 | ||
658 | err: | |
659 | while (--i >= 0) | |
660 | srpt_free_ioctx(sdev, ring[i], dma_size, dir); | |
661 | kfree(ring); | |
715252d4 | 662 | ring = NULL; |
a42d985b BVA |
663 | out: |
664 | return ring; | |
665 | } | |
666 | ||
667 | /** | |
668 | * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures. | |
669 | */ | |
670 | static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring, | |
671 | struct srpt_device *sdev, int ring_size, | |
672 | int dma_size, enum dma_data_direction dir) | |
673 | { | |
674 | int i; | |
675 | ||
676 | for (i = 0; i < ring_size; ++i) | |
677 | srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir); | |
678 | kfree(ioctx_ring); | |
679 | } | |
680 | ||
681 | /** | |
682 | * srpt_get_cmd_state() - Get the state of a SCSI command. | |
683 | */ | |
684 | static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx) | |
685 | { | |
686 | enum srpt_command_state state; | |
687 | unsigned long flags; | |
688 | ||
689 | BUG_ON(!ioctx); | |
690 | ||
691 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
692 | state = ioctx->state; | |
693 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
694 | return state; | |
695 | } | |
696 | ||
697 | /** | |
698 | * srpt_set_cmd_state() - Set the state of a SCSI command. | |
699 | * | |
700 | * Does not modify the state of aborted commands. Returns the previous command | |
701 | * state. | |
702 | */ | |
703 | static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
704 | enum srpt_command_state new) | |
705 | { | |
706 | enum srpt_command_state previous; | |
707 | unsigned long flags; | |
708 | ||
709 | BUG_ON(!ioctx); | |
710 | ||
711 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
712 | previous = ioctx->state; | |
713 | if (previous != SRPT_STATE_DONE) | |
714 | ioctx->state = new; | |
715 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
716 | ||
717 | return previous; | |
718 | } | |
719 | ||
720 | /** | |
721 | * srpt_test_and_set_cmd_state() - Test and set the state of a command. | |
722 | * | |
723 | * Returns true if and only if the previous command state was equal to 'old'. | |
724 | */ | |
725 | static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
726 | enum srpt_command_state old, | |
727 | enum srpt_command_state new) | |
728 | { | |
729 | enum srpt_command_state previous; | |
730 | unsigned long flags; | |
731 | ||
732 | WARN_ON(!ioctx); | |
733 | WARN_ON(old == SRPT_STATE_DONE); | |
734 | WARN_ON(new == SRPT_STATE_NEW); | |
735 | ||
736 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
737 | previous = ioctx->state; | |
738 | if (previous == old) | |
739 | ioctx->state = new; | |
740 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
741 | return previous == old; | |
742 | } | |
743 | ||
744 | /** | |
745 | * srpt_post_recv() - Post an IB receive request. | |
746 | */ | |
747 | static int srpt_post_recv(struct srpt_device *sdev, | |
748 | struct srpt_recv_ioctx *ioctx) | |
749 | { | |
750 | struct ib_sge list; | |
751 | struct ib_recv_wr wr, *bad_wr; | |
752 | ||
753 | BUG_ON(!sdev); | |
a42d985b BVA |
754 | list.addr = ioctx->ioctx.dma; |
755 | list.length = srp_max_req_size; | |
5a783956 | 756 | list.lkey = sdev->pd->local_dma_lkey; |
a42d985b | 757 | |
59fae4de CH |
758 | ioctx->ioctx.cqe.done = srpt_recv_done; |
759 | wr.wr_cqe = &ioctx->ioctx.cqe; | |
a42d985b BVA |
760 | wr.next = NULL; |
761 | wr.sg_list = &list; | |
762 | wr.num_sge = 1; | |
763 | ||
764 | return ib_post_srq_recv(sdev->srq, &wr, &bad_wr); | |
765 | } | |
766 | ||
767 | /** | |
768 | * srpt_post_send() - Post an IB send request. | |
769 | * | |
770 | * Returns zero upon success and a non-zero value upon failure. | |
771 | */ | |
772 | static int srpt_post_send(struct srpt_rdma_ch *ch, | |
773 | struct srpt_send_ioctx *ioctx, int len) | |
774 | { | |
775 | struct ib_sge list; | |
776 | struct ib_send_wr wr, *bad_wr; | |
777 | struct srpt_device *sdev = ch->sport->sdev; | |
778 | int ret; | |
779 | ||
780 | atomic_inc(&ch->req_lim); | |
781 | ||
782 | ret = -ENOMEM; | |
783 | if (unlikely(atomic_dec_return(&ch->sq_wr_avail) < 0)) { | |
9f5d32af | 784 | pr_warn("IB send queue full (needed 1)\n"); |
a42d985b BVA |
785 | goto out; |
786 | } | |
787 | ||
788 | ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len, | |
789 | DMA_TO_DEVICE); | |
790 | ||
791 | list.addr = ioctx->ioctx.dma; | |
792 | list.length = len; | |
5a783956 | 793 | list.lkey = sdev->pd->local_dma_lkey; |
a42d985b | 794 | |
59fae4de | 795 | ioctx->ioctx.cqe.done = srpt_send_done; |
a42d985b | 796 | wr.next = NULL; |
59fae4de | 797 | wr.wr_cqe = &ioctx->ioctx.cqe; |
a42d985b BVA |
798 | wr.sg_list = &list; |
799 | wr.num_sge = 1; | |
800 | wr.opcode = IB_WR_SEND; | |
801 | wr.send_flags = IB_SEND_SIGNALED; | |
802 | ||
803 | ret = ib_post_send(ch->qp, &wr, &bad_wr); | |
804 | ||
805 | out: | |
806 | if (ret < 0) { | |
807 | atomic_inc(&ch->sq_wr_avail); | |
808 | atomic_dec(&ch->req_lim); | |
809 | } | |
810 | return ret; | |
811 | } | |
812 | ||
aaf45bd8 BVA |
813 | /** |
814 | * srpt_zerolength_write() - Perform a zero-length RDMA write. | |
815 | * | |
816 | * A quote from the InfiniBand specification: C9-88: For an HCA responder | |
817 | * using Reliable Connection service, for each zero-length RDMA READ or WRITE | |
818 | * request, the R_Key shall not be validated, even if the request includes | |
819 | * Immediate data. | |
820 | */ | |
821 | static int srpt_zerolength_write(struct srpt_rdma_ch *ch) | |
822 | { | |
823 | struct ib_send_wr wr, *bad_wr; | |
824 | ||
825 | memset(&wr, 0, sizeof(wr)); | |
826 | wr.opcode = IB_WR_RDMA_WRITE; | |
827 | wr.wr_cqe = &ch->zw_cqe; | |
828 | wr.send_flags = IB_SEND_SIGNALED; | |
829 | return ib_post_send(ch->qp, &wr, &bad_wr); | |
830 | } | |
831 | ||
832 | static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc) | |
833 | { | |
834 | struct srpt_rdma_ch *ch = cq->cq_context; | |
835 | ||
387add46 BVA |
836 | if (wc->status == IB_WC_SUCCESS) { |
837 | srpt_process_wait_list(ch); | |
838 | } else { | |
839 | if (srpt_set_ch_state(ch, CH_DISCONNECTED)) | |
840 | schedule_work(&ch->release_work); | |
841 | else | |
5658600e | 842 | WARN_ONCE(1, "%s-%d\n", ch->sess_name, ch->qp->qp_num); |
387add46 | 843 | } |
aaf45bd8 BVA |
844 | } |
845 | ||
a42d985b BVA |
846 | /** |
847 | * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request. | |
848 | * @ioctx: Pointer to the I/O context associated with the request. | |
849 | * @srp_cmd: Pointer to the SRP_CMD request data. | |
850 | * @dir: Pointer to the variable to which the transfer direction will be | |
851 | * written. | |
852 | * @data_len: Pointer to the variable to which the total data length of all | |
853 | * descriptors in the SRP_CMD request will be written. | |
854 | * | |
855 | * This function initializes ioctx->nrbuf and ioctx->r_bufs. | |
856 | * | |
857 | * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors; | |
858 | * -ENOMEM when memory allocation fails and zero upon success. | |
859 | */ | |
860 | static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx, | |
861 | struct srp_cmd *srp_cmd, | |
862 | enum dma_data_direction *dir, u64 *data_len) | |
863 | { | |
864 | struct srp_indirect_buf *idb; | |
865 | struct srp_direct_buf *db; | |
866 | unsigned add_cdb_offset; | |
867 | int ret; | |
868 | ||
869 | /* | |
870 | * The pointer computations below will only be compiled correctly | |
871 | * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check | |
872 | * whether srp_cmd::add_data has been declared as a byte pointer. | |
873 | */ | |
874 | BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) | |
875 | && !__same_type(srp_cmd->add_data[0], (u8)0)); | |
876 | ||
877 | BUG_ON(!dir); | |
878 | BUG_ON(!data_len); | |
879 | ||
880 | ret = 0; | |
881 | *data_len = 0; | |
882 | ||
883 | /* | |
884 | * The lower four bits of the buffer format field contain the DATA-IN | |
885 | * buffer descriptor format, and the highest four bits contain the | |
886 | * DATA-OUT buffer descriptor format. | |
887 | */ | |
888 | *dir = DMA_NONE; | |
889 | if (srp_cmd->buf_fmt & 0xf) | |
890 | /* DATA-IN: transfer data from target to initiator (read). */ | |
891 | *dir = DMA_FROM_DEVICE; | |
892 | else if (srp_cmd->buf_fmt >> 4) | |
893 | /* DATA-OUT: transfer data from initiator to target (write). */ | |
894 | *dir = DMA_TO_DEVICE; | |
895 | ||
896 | /* | |
897 | * According to the SRP spec, the lower two bits of the 'ADDITIONAL | |
898 | * CDB LENGTH' field are reserved and the size in bytes of this field | |
899 | * is four times the value specified in bits 3..7. Hence the "& ~3". | |
900 | */ | |
901 | add_cdb_offset = srp_cmd->add_cdb_len & ~3; | |
902 | if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) || | |
903 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) { | |
904 | ioctx->n_rbuf = 1; | |
905 | ioctx->rbufs = &ioctx->single_rbuf; | |
906 | ||
907 | db = (struct srp_direct_buf *)(srp_cmd->add_data | |
908 | + add_cdb_offset); | |
9d2aa2b4 | 909 | memcpy(ioctx->rbufs, db, sizeof(*db)); |
a42d985b BVA |
910 | *data_len = be32_to_cpu(db->len); |
911 | } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) || | |
912 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) { | |
913 | idb = (struct srp_indirect_buf *)(srp_cmd->add_data | |
914 | + add_cdb_offset); | |
915 | ||
9d2aa2b4 | 916 | ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof(*db); |
a42d985b BVA |
917 | |
918 | if (ioctx->n_rbuf > | |
919 | (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) { | |
9f5d32af | 920 | pr_err("received unsupported SRP_CMD request" |
a42d985b BVA |
921 | " type (%u out + %u in != %u / %zu)\n", |
922 | srp_cmd->data_out_desc_cnt, | |
923 | srp_cmd->data_in_desc_cnt, | |
924 | be32_to_cpu(idb->table_desc.len), | |
925 | sizeof(*db)); | |
926 | ioctx->n_rbuf = 0; | |
927 | ret = -EINVAL; | |
928 | goto out; | |
929 | } | |
930 | ||
931 | if (ioctx->n_rbuf == 1) | |
932 | ioctx->rbufs = &ioctx->single_rbuf; | |
933 | else { | |
934 | ioctx->rbufs = | |
9d2aa2b4 | 935 | kmalloc(ioctx->n_rbuf * sizeof(*db), GFP_ATOMIC); |
a42d985b BVA |
936 | if (!ioctx->rbufs) { |
937 | ioctx->n_rbuf = 0; | |
938 | ret = -ENOMEM; | |
939 | goto out; | |
940 | } | |
941 | } | |
942 | ||
943 | db = idb->desc_list; | |
9d2aa2b4 | 944 | memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof(*db)); |
a42d985b BVA |
945 | *data_len = be32_to_cpu(idb->len); |
946 | } | |
947 | out: | |
948 | return ret; | |
949 | } | |
950 | ||
951 | /** | |
952 | * srpt_init_ch_qp() - Initialize queue pair attributes. | |
953 | * | |
954 | * Initialized the attributes of queue pair 'qp' by allowing local write, | |
955 | * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT. | |
956 | */ | |
957 | static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
958 | { | |
959 | struct ib_qp_attr *attr; | |
960 | int ret; | |
961 | ||
9d2aa2b4 | 962 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
a42d985b BVA |
963 | if (!attr) |
964 | return -ENOMEM; | |
965 | ||
966 | attr->qp_state = IB_QPS_INIT; | |
967 | attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ | | |
968 | IB_ACCESS_REMOTE_WRITE; | |
969 | attr->port_num = ch->sport->port; | |
970 | attr->pkey_index = 0; | |
971 | ||
972 | ret = ib_modify_qp(qp, attr, | |
973 | IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT | | |
974 | IB_QP_PKEY_INDEX); | |
975 | ||
976 | kfree(attr); | |
977 | return ret; | |
978 | } | |
979 | ||
980 | /** | |
981 | * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR). | |
982 | * @ch: channel of the queue pair. | |
983 | * @qp: queue pair to change the state of. | |
984 | * | |
985 | * Returns zero upon success and a negative value upon failure. | |
986 | * | |
987 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
988 | * If this structure ever becomes larger, it might be necessary to allocate | |
989 | * it dynamically instead of on the stack. | |
990 | */ | |
991 | static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
992 | { | |
993 | struct ib_qp_attr qp_attr; | |
994 | int attr_mask; | |
995 | int ret; | |
996 | ||
997 | qp_attr.qp_state = IB_QPS_RTR; | |
998 | ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask); | |
999 | if (ret) | |
1000 | goto out; | |
1001 | ||
1002 | qp_attr.max_dest_rd_atomic = 4; | |
1003 | ||
1004 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
1005 | ||
1006 | out: | |
1007 | return ret; | |
1008 | } | |
1009 | ||
1010 | /** | |
1011 | * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS). | |
1012 | * @ch: channel of the queue pair. | |
1013 | * @qp: queue pair to change the state of. | |
1014 | * | |
1015 | * Returns zero upon success and a negative value upon failure. | |
1016 | * | |
1017 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
1018 | * If this structure ever becomes larger, it might be necessary to allocate | |
1019 | * it dynamically instead of on the stack. | |
1020 | */ | |
1021 | static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1022 | { | |
1023 | struct ib_qp_attr qp_attr; | |
1024 | int attr_mask; | |
1025 | int ret; | |
1026 | ||
1027 | qp_attr.qp_state = IB_QPS_RTS; | |
1028 | ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask); | |
1029 | if (ret) | |
1030 | goto out; | |
1031 | ||
1032 | qp_attr.max_rd_atomic = 4; | |
1033 | ||
1034 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
1035 | ||
1036 | out: | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1040 | /** | |
1041 | * srpt_ch_qp_err() - Set the channel queue pair state to 'error'. | |
1042 | */ | |
1043 | static int srpt_ch_qp_err(struct srpt_rdma_ch *ch) | |
1044 | { | |
1045 | struct ib_qp_attr qp_attr; | |
1046 | ||
1047 | qp_attr.qp_state = IB_QPS_ERR; | |
1048 | return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE); | |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list. | |
1053 | */ | |
1054 | static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch, | |
1055 | struct srpt_send_ioctx *ioctx) | |
1056 | { | |
1057 | struct scatterlist *sg; | |
1058 | enum dma_data_direction dir; | |
1059 | ||
1060 | BUG_ON(!ch); | |
1061 | BUG_ON(!ioctx); | |
59fae4de | 1062 | BUG_ON(ioctx->n_rdma && !ioctx->rdma_wrs); |
a42d985b BVA |
1063 | |
1064 | while (ioctx->n_rdma) | |
59fae4de | 1065 | kfree(ioctx->rdma_wrs[--ioctx->n_rdma].wr.sg_list); |
a42d985b | 1066 | |
59fae4de CH |
1067 | kfree(ioctx->rdma_wrs); |
1068 | ioctx->rdma_wrs = NULL; | |
a42d985b BVA |
1069 | |
1070 | if (ioctx->mapped_sg_count) { | |
1071 | sg = ioctx->sg; | |
1072 | WARN_ON(!sg); | |
1073 | dir = ioctx->cmd.data_direction; | |
1074 | BUG_ON(dir == DMA_NONE); | |
1075 | ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt, | |
671ec1b2 | 1076 | target_reverse_dma_direction(&ioctx->cmd)); |
a42d985b BVA |
1077 | ioctx->mapped_sg_count = 0; |
1078 | } | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list. | |
1083 | */ | |
1084 | static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch, | |
1085 | struct srpt_send_ioctx *ioctx) | |
1086 | { | |
b0768080 | 1087 | struct ib_device *dev = ch->sport->sdev->device; |
a42d985b BVA |
1088 | struct se_cmd *cmd; |
1089 | struct scatterlist *sg, *sg_orig; | |
1090 | int sg_cnt; | |
1091 | enum dma_data_direction dir; | |
59fae4de | 1092 | struct ib_rdma_wr *riu; |
a42d985b BVA |
1093 | struct srp_direct_buf *db; |
1094 | dma_addr_t dma_addr; | |
1095 | struct ib_sge *sge; | |
1096 | u64 raddr; | |
1097 | u32 rsize; | |
1098 | u32 tsize; | |
1099 | u32 dma_len; | |
1100 | int count, nrdma; | |
1101 | int i, j, k; | |
1102 | ||
1103 | BUG_ON(!ch); | |
1104 | BUG_ON(!ioctx); | |
1105 | cmd = &ioctx->cmd; | |
1106 | dir = cmd->data_direction; | |
1107 | BUG_ON(dir == DMA_NONE); | |
1108 | ||
6f9e7f01 RD |
1109 | ioctx->sg = sg = sg_orig = cmd->t_data_sg; |
1110 | ioctx->sg_cnt = sg_cnt = cmd->t_data_nents; | |
a42d985b BVA |
1111 | |
1112 | count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt, | |
671ec1b2 | 1113 | target_reverse_dma_direction(cmd)); |
a42d985b BVA |
1114 | if (unlikely(!count)) |
1115 | return -EAGAIN; | |
1116 | ||
1117 | ioctx->mapped_sg_count = count; | |
1118 | ||
59fae4de CH |
1119 | if (ioctx->rdma_wrs && ioctx->n_rdma_wrs) |
1120 | nrdma = ioctx->n_rdma_wrs; | |
a42d985b BVA |
1121 | else { |
1122 | nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE | |
1123 | + ioctx->n_rbuf; | |
1124 | ||
59fae4de CH |
1125 | ioctx->rdma_wrs = kcalloc(nrdma, sizeof(*ioctx->rdma_wrs), |
1126 | GFP_KERNEL); | |
1127 | if (!ioctx->rdma_wrs) | |
a42d985b BVA |
1128 | goto free_mem; |
1129 | ||
59fae4de | 1130 | ioctx->n_rdma_wrs = nrdma; |
a42d985b BVA |
1131 | } |
1132 | ||
1133 | db = ioctx->rbufs; | |
1134 | tsize = cmd->data_length; | |
b0768080 | 1135 | dma_len = ib_sg_dma_len(dev, &sg[0]); |
59fae4de | 1136 | riu = ioctx->rdma_wrs; |
a42d985b BVA |
1137 | |
1138 | /* | |
1139 | * For each remote desc - calculate the #ib_sge. | |
1140 | * If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then | |
1141 | * each remote desc rdma_iu is required a rdma wr; | |
1142 | * else | |
1143 | * we need to allocate extra rdma_iu to carry extra #ib_sge in | |
1144 | * another rdma wr | |
1145 | */ | |
1146 | for (i = 0, j = 0; | |
1147 | j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) { | |
1148 | rsize = be32_to_cpu(db->len); | |
1149 | raddr = be64_to_cpu(db->va); | |
59fae4de | 1150 | riu->remote_addr = raddr; |
a42d985b | 1151 | riu->rkey = be32_to_cpu(db->key); |
59fae4de | 1152 | riu->wr.num_sge = 0; |
a42d985b BVA |
1153 | |
1154 | /* calculate how many sge required for this remote_buf */ | |
1155 | while (rsize > 0 && tsize > 0) { | |
1156 | ||
1157 | if (rsize >= dma_len) { | |
1158 | tsize -= dma_len; | |
1159 | rsize -= dma_len; | |
1160 | raddr += dma_len; | |
1161 | ||
1162 | if (tsize > 0) { | |
1163 | ++j; | |
1164 | if (j < count) { | |
1165 | sg = sg_next(sg); | |
b0768080 MM |
1166 | dma_len = ib_sg_dma_len( |
1167 | dev, sg); | |
a42d985b BVA |
1168 | } |
1169 | } | |
1170 | } else { | |
1171 | tsize -= rsize; | |
1172 | dma_len -= rsize; | |
1173 | rsize = 0; | |
1174 | } | |
1175 | ||
59fae4de | 1176 | ++riu->wr.num_sge; |
a42d985b | 1177 | |
59fae4de CH |
1178 | if (rsize > 0 && |
1179 | riu->wr.num_sge == SRPT_DEF_SG_PER_WQE) { | |
a42d985b | 1180 | ++ioctx->n_rdma; |
59fae4de CH |
1181 | riu->wr.sg_list = kmalloc_array(riu->wr.num_sge, |
1182 | sizeof(*riu->wr.sg_list), | |
1183 | GFP_KERNEL); | |
1184 | if (!riu->wr.sg_list) | |
a42d985b BVA |
1185 | goto free_mem; |
1186 | ||
1187 | ++riu; | |
59fae4de CH |
1188 | riu->wr.num_sge = 0; |
1189 | riu->remote_addr = raddr; | |
a42d985b BVA |
1190 | riu->rkey = be32_to_cpu(db->key); |
1191 | } | |
1192 | } | |
1193 | ||
1194 | ++ioctx->n_rdma; | |
59fae4de CH |
1195 | riu->wr.sg_list = kmalloc_array(riu->wr.num_sge, |
1196 | sizeof(*riu->wr.sg_list), | |
1197 | GFP_KERNEL); | |
1198 | if (!riu->wr.sg_list) | |
a42d985b BVA |
1199 | goto free_mem; |
1200 | } | |
1201 | ||
1202 | db = ioctx->rbufs; | |
1203 | tsize = cmd->data_length; | |
59fae4de | 1204 | riu = ioctx->rdma_wrs; |
a42d985b | 1205 | sg = sg_orig; |
b0768080 MM |
1206 | dma_len = ib_sg_dma_len(dev, &sg[0]); |
1207 | dma_addr = ib_sg_dma_address(dev, &sg[0]); | |
a42d985b BVA |
1208 | |
1209 | /* this second loop is really mapped sg_addres to rdma_iu->ib_sge */ | |
1210 | for (i = 0, j = 0; | |
1211 | j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) { | |
1212 | rsize = be32_to_cpu(db->len); | |
59fae4de | 1213 | sge = riu->wr.sg_list; |
a42d985b BVA |
1214 | k = 0; |
1215 | ||
1216 | while (rsize > 0 && tsize > 0) { | |
1217 | sge->addr = dma_addr; | |
5a783956 | 1218 | sge->lkey = ch->sport->sdev->pd->local_dma_lkey; |
a42d985b BVA |
1219 | |
1220 | if (rsize >= dma_len) { | |
1221 | sge->length = | |
1222 | (tsize < dma_len) ? tsize : dma_len; | |
1223 | tsize -= dma_len; | |
1224 | rsize -= dma_len; | |
1225 | ||
1226 | if (tsize > 0) { | |
1227 | ++j; | |
1228 | if (j < count) { | |
1229 | sg = sg_next(sg); | |
b0768080 MM |
1230 | dma_len = ib_sg_dma_len( |
1231 | dev, sg); | |
1232 | dma_addr = ib_sg_dma_address( | |
1233 | dev, sg); | |
a42d985b BVA |
1234 | } |
1235 | } | |
1236 | } else { | |
1237 | sge->length = (tsize < rsize) ? tsize : rsize; | |
1238 | tsize -= rsize; | |
1239 | dma_len -= rsize; | |
1240 | dma_addr += rsize; | |
1241 | rsize = 0; | |
1242 | } | |
1243 | ||
1244 | ++k; | |
59fae4de | 1245 | if (k == riu->wr.num_sge && rsize > 0 && tsize > 0) { |
a42d985b | 1246 | ++riu; |
59fae4de | 1247 | sge = riu->wr.sg_list; |
a42d985b BVA |
1248 | k = 0; |
1249 | } else if (rsize > 0 && tsize > 0) | |
1250 | ++sge; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | return 0; | |
1255 | ||
1256 | free_mem: | |
1257 | srpt_unmap_sg_to_ib_sge(ch, ioctx); | |
1258 | ||
1259 | return -ENOMEM; | |
1260 | } | |
1261 | ||
1262 | /** | |
1263 | * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator. | |
1264 | */ | |
1265 | static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch) | |
1266 | { | |
0fd10721 | 1267 | struct se_session *se_sess; |
a42d985b | 1268 | struct srpt_send_ioctx *ioctx; |
0fd10721 | 1269 | int tag; |
a42d985b BVA |
1270 | |
1271 | BUG_ON(!ch); | |
0fd10721 | 1272 | se_sess = ch->sess; |
a42d985b | 1273 | |
0fd10721 NB |
1274 | tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING); |
1275 | if (tag < 0) { | |
1276 | pr_err("Unable to obtain tag for srpt_send_ioctx\n"); | |
1277 | return NULL; | |
a42d985b | 1278 | } |
0fd10721 NB |
1279 | ioctx = &((struct srpt_send_ioctx *)se_sess->sess_cmd_map)[tag]; |
1280 | memset(ioctx, 0, sizeof(struct srpt_send_ioctx)); | |
1281 | ioctx->ch = ch; | |
a42d985b BVA |
1282 | spin_lock_init(&ioctx->spinlock); |
1283 | ioctx->state = SRPT_STATE_NEW; | |
a42d985b | 1284 | init_completion(&ioctx->tx_done); |
0fd10721 NB |
1285 | |
1286 | ioctx->cmd.map_tag = tag; | |
a42d985b BVA |
1287 | |
1288 | return ioctx; | |
1289 | } | |
1290 | ||
a42d985b BVA |
1291 | /** |
1292 | * srpt_abort_cmd() - Abort a SCSI command. | |
1293 | * @ioctx: I/O context associated with the SCSI command. | |
1294 | * @context: Preferred execution context. | |
1295 | */ | |
1296 | static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx) | |
1297 | { | |
1298 | enum srpt_command_state state; | |
1299 | unsigned long flags; | |
1300 | ||
1301 | BUG_ON(!ioctx); | |
1302 | ||
1303 | /* | |
1304 | * If the command is in a state where the target core is waiting for | |
49f40163 | 1305 | * the ib_srpt driver, change the state to the next state. |
a42d985b BVA |
1306 | */ |
1307 | ||
1308 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
1309 | state = ioctx->state; | |
1310 | switch (state) { | |
1311 | case SRPT_STATE_NEED_DATA: | |
1312 | ioctx->state = SRPT_STATE_DATA_IN; | |
1313 | break; | |
a42d985b BVA |
1314 | case SRPT_STATE_CMD_RSP_SENT: |
1315 | case SRPT_STATE_MGMT_RSP_SENT: | |
1316 | ioctx->state = SRPT_STATE_DONE; | |
1317 | break; | |
1318 | default: | |
49f40163 BVA |
1319 | WARN_ONCE(true, "%s: unexpected I/O context state %d\n", |
1320 | __func__, state); | |
a42d985b BVA |
1321 | break; |
1322 | } | |
1323 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
1324 | ||
a42d985b | 1325 | pr_debug("Aborting cmd with state %d and tag %lld\n", state, |
649ee054 | 1326 | ioctx->cmd.tag); |
a42d985b BVA |
1327 | |
1328 | switch (state) { | |
1329 | case SRPT_STATE_NEW: | |
1330 | case SRPT_STATE_DATA_IN: | |
1331 | case SRPT_STATE_MGMT: | |
49f40163 | 1332 | case SRPT_STATE_DONE: |
a42d985b BVA |
1333 | /* |
1334 | * Do nothing - defer abort processing until | |
1335 | * srpt_queue_response() is invoked. | |
1336 | */ | |
a42d985b BVA |
1337 | break; |
1338 | case SRPT_STATE_NEED_DATA: | |
49f40163 BVA |
1339 | pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag); |
1340 | transport_generic_request_failure(&ioctx->cmd, | |
1341 | TCM_CHECK_CONDITION_ABORT_CMD); | |
a42d985b BVA |
1342 | break; |
1343 | case SRPT_STATE_CMD_RSP_SENT: | |
1344 | /* | |
1345 | * SRP_RSP sending failed or the SRP_RSP send completion has | |
1346 | * not been received in time. | |
1347 | */ | |
1348 | srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx); | |
49f40163 | 1349 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1350 | break; |
1351 | case SRPT_STATE_MGMT_RSP_SENT: | |
49f40163 | 1352 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1353 | break; |
1354 | default: | |
532ec6f1 | 1355 | WARN(1, "Unexpected command state (%d)", state); |
a42d985b BVA |
1356 | break; |
1357 | } | |
1358 | ||
a42d985b BVA |
1359 | return state; |
1360 | } | |
1361 | ||
1362 | /** | |
e672a47f CH |
1363 | * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping |
1364 | * the data that has been transferred via IB RDMA had to be postponed until the | |
142ad5db | 1365 | * check_stop_free() callback. None of this is necessary anymore and needs to |
e672a47f | 1366 | * be cleaned up. |
a42d985b | 1367 | */ |
59fae4de | 1368 | static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1369 | { |
59fae4de CH |
1370 | struct srpt_rdma_ch *ch = cq->cq_context; |
1371 | struct srpt_send_ioctx *ioctx = | |
19f57298 | 1372 | container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe); |
59fae4de | 1373 | |
a42d985b BVA |
1374 | WARN_ON(ioctx->n_rdma <= 0); |
1375 | atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); | |
1376 | ||
59fae4de CH |
1377 | if (unlikely(wc->status != IB_WC_SUCCESS)) { |
1378 | pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n", | |
1379 | ioctx, wc->status); | |
1380 | srpt_abort_cmd(ioctx); | |
1381 | return; | |
a42d985b | 1382 | } |
59fae4de CH |
1383 | |
1384 | if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, | |
1385 | SRPT_STATE_DATA_IN)) | |
1386 | target_execute_cmd(&ioctx->cmd); | |
1387 | else | |
1388 | pr_err("%s[%d]: wrong state = %d\n", __func__, | |
1389 | __LINE__, srpt_get_cmd_state(ioctx)); | |
a42d985b BVA |
1390 | } |
1391 | ||
59fae4de | 1392 | static void srpt_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1393 | { |
59fae4de | 1394 | struct srpt_send_ioctx *ioctx = |
19f57298 | 1395 | container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe); |
a42d985b | 1396 | |
59fae4de | 1397 | if (unlikely(wc->status != IB_WC_SUCCESS)) { |
49f40163 BVA |
1398 | /* |
1399 | * Note: if an RDMA write error completion is received that | |
1400 | * means that a SEND also has been posted. Defer further | |
1401 | * processing of the associated command until the send error | |
1402 | * completion has been received. | |
1403 | */ | |
59fae4de CH |
1404 | pr_info("RDMA_WRITE for ioctx 0x%p failed with status %d\n", |
1405 | ioctx, wc->status); | |
a42d985b BVA |
1406 | } |
1407 | } | |
1408 | ||
1409 | /** | |
1410 | * srpt_build_cmd_rsp() - Build an SRP_RSP response. | |
1411 | * @ch: RDMA channel through which the request has been received. | |
1412 | * @ioctx: I/O context associated with the SRP_CMD request. The response will | |
1413 | * be built in the buffer ioctx->buf points at and hence this function will | |
1414 | * overwrite the request data. | |
1415 | * @tag: tag of the request for which this response is being generated. | |
1416 | * @status: value for the STATUS field of the SRP_RSP information unit. | |
1417 | * | |
1418 | * Returns the size in bytes of the SRP_RSP response. | |
1419 | * | |
1420 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1421 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1422 | * response. See also SPC-2 for more information about sense data. | |
1423 | */ | |
1424 | static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch, | |
1425 | struct srpt_send_ioctx *ioctx, u64 tag, | |
1426 | int status) | |
1427 | { | |
1428 | struct srp_rsp *srp_rsp; | |
1429 | const u8 *sense_data; | |
1430 | int sense_data_len, max_sense_len; | |
1431 | ||
1432 | /* | |
1433 | * The lowest bit of all SAM-3 status codes is zero (see also | |
1434 | * paragraph 5.3 in SAM-3). | |
1435 | */ | |
1436 | WARN_ON(status & 1); | |
1437 | ||
1438 | srp_rsp = ioctx->ioctx.buf; | |
1439 | BUG_ON(!srp_rsp); | |
1440 | ||
1441 | sense_data = ioctx->sense_data; | |
1442 | sense_data_len = ioctx->cmd.scsi_sense_length; | |
1443 | WARN_ON(sense_data_len > sizeof(ioctx->sense_data)); | |
1444 | ||
9d2aa2b4 | 1445 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1446 | srp_rsp->opcode = SRP_RSP; |
1447 | srp_rsp->req_lim_delta = | |
b356c1c1 | 1448 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); |
a42d985b BVA |
1449 | srp_rsp->tag = tag; |
1450 | srp_rsp->status = status; | |
1451 | ||
1452 | if (sense_data_len) { | |
1453 | BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp)); | |
1454 | max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp); | |
1455 | if (sense_data_len > max_sense_len) { | |
9f5d32af DL |
1456 | pr_warn("truncated sense data from %d to %d" |
1457 | " bytes\n", sense_data_len, max_sense_len); | |
a42d985b BVA |
1458 | sense_data_len = max_sense_len; |
1459 | } | |
1460 | ||
1461 | srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
1462 | srp_rsp->sense_data_len = cpu_to_be32(sense_data_len); | |
1463 | memcpy(srp_rsp + 1, sense_data, sense_data_len); | |
1464 | } | |
1465 | ||
1466 | return sizeof(*srp_rsp) + sense_data_len; | |
1467 | } | |
1468 | ||
1469 | /** | |
1470 | * srpt_build_tskmgmt_rsp() - Build a task management response. | |
1471 | * @ch: RDMA channel through which the request has been received. | |
1472 | * @ioctx: I/O context in which the SRP_RSP response will be built. | |
1473 | * @rsp_code: RSP_CODE that will be stored in the response. | |
1474 | * @tag: Tag of the request for which this response is being generated. | |
1475 | * | |
1476 | * Returns the size in bytes of the SRP_RSP response. | |
1477 | * | |
1478 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1479 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1480 | * response. | |
1481 | */ | |
1482 | static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch, | |
1483 | struct srpt_send_ioctx *ioctx, | |
1484 | u8 rsp_code, u64 tag) | |
1485 | { | |
1486 | struct srp_rsp *srp_rsp; | |
1487 | int resp_data_len; | |
1488 | int resp_len; | |
1489 | ||
c807f643 | 1490 | resp_data_len = 4; |
a42d985b BVA |
1491 | resp_len = sizeof(*srp_rsp) + resp_data_len; |
1492 | ||
1493 | srp_rsp = ioctx->ioctx.buf; | |
1494 | BUG_ON(!srp_rsp); | |
9d2aa2b4 | 1495 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1496 | |
1497 | srp_rsp->opcode = SRP_RSP; | |
b356c1c1 VT |
1498 | srp_rsp->req_lim_delta = |
1499 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); | |
a42d985b BVA |
1500 | srp_rsp->tag = tag; |
1501 | ||
c807f643 JW |
1502 | srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID; |
1503 | srp_rsp->resp_data_len = cpu_to_be32(resp_data_len); | |
1504 | srp_rsp->data[3] = rsp_code; | |
a42d985b BVA |
1505 | |
1506 | return resp_len; | |
1507 | } | |
1508 | ||
a42d985b BVA |
1509 | static int srpt_check_stop_free(struct se_cmd *cmd) |
1510 | { | |
9474b043 NB |
1511 | struct srpt_send_ioctx *ioctx = container_of(cmd, |
1512 | struct srpt_send_ioctx, cmd); | |
a42d985b | 1513 | |
afc16604 | 1514 | return target_put_sess_cmd(&ioctx->cmd); |
a42d985b BVA |
1515 | } |
1516 | ||
1517 | /** | |
1518 | * srpt_handle_cmd() - Process SRP_CMD. | |
1519 | */ | |
2c7f37ff BVA |
1520 | static void srpt_handle_cmd(struct srpt_rdma_ch *ch, |
1521 | struct srpt_recv_ioctx *recv_ioctx, | |
1522 | struct srpt_send_ioctx *send_ioctx) | |
a42d985b BVA |
1523 | { |
1524 | struct se_cmd *cmd; | |
1525 | struct srp_cmd *srp_cmd; | |
a42d985b BVA |
1526 | u64 data_len; |
1527 | enum dma_data_direction dir; | |
9474b043 | 1528 | int rc; |
a42d985b BVA |
1529 | |
1530 | BUG_ON(!send_ioctx); | |
1531 | ||
1532 | srp_cmd = recv_ioctx->ioctx.buf; | |
a42d985b | 1533 | cmd = &send_ioctx->cmd; |
649ee054 | 1534 | cmd->tag = srp_cmd->tag; |
a42d985b BVA |
1535 | |
1536 | switch (srp_cmd->task_attr) { | |
1537 | case SRP_CMD_SIMPLE_Q: | |
68d81f40 | 1538 | cmd->sam_task_attr = TCM_SIMPLE_TAG; |
a42d985b BVA |
1539 | break; |
1540 | case SRP_CMD_ORDERED_Q: | |
1541 | default: | |
68d81f40 | 1542 | cmd->sam_task_attr = TCM_ORDERED_TAG; |
a42d985b BVA |
1543 | break; |
1544 | case SRP_CMD_HEAD_OF_Q: | |
68d81f40 | 1545 | cmd->sam_task_attr = TCM_HEAD_TAG; |
a42d985b BVA |
1546 | break; |
1547 | case SRP_CMD_ACA: | |
68d81f40 | 1548 | cmd->sam_task_attr = TCM_ACA_TAG; |
a42d985b BVA |
1549 | break; |
1550 | } | |
1551 | ||
de103c93 | 1552 | if (srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len)) { |
9f5d32af | 1553 | pr_err("0x%llx: parsing SRP descriptor table failed.\n", |
a42d985b | 1554 | srp_cmd->tag); |
2c7f37ff | 1555 | goto release_ioctx; |
a42d985b BVA |
1556 | } |
1557 | ||
9474b043 | 1558 | rc = target_submit_cmd(cmd, ch->sess, srp_cmd->cdb, |
e1dd413c BVA |
1559 | &send_ioctx->sense_data[0], |
1560 | scsilun_to_int(&srp_cmd->lun), data_len, | |
1561 | TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF); | |
9474b043 | 1562 | if (rc != 0) { |
2c7f37ff BVA |
1563 | pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc, |
1564 | srp_cmd->tag); | |
1565 | goto release_ioctx; | |
187e70a5 | 1566 | } |
2c7f37ff | 1567 | return; |
a42d985b | 1568 | |
2c7f37ff BVA |
1569 | release_ioctx: |
1570 | send_ioctx->state = SRPT_STATE_DONE; | |
1571 | srpt_release_cmd(cmd); | |
a42d985b BVA |
1572 | } |
1573 | ||
a42d985b BVA |
1574 | static int srp_tmr_to_tcm(int fn) |
1575 | { | |
1576 | switch (fn) { | |
1577 | case SRP_TSK_ABORT_TASK: | |
1578 | return TMR_ABORT_TASK; | |
1579 | case SRP_TSK_ABORT_TASK_SET: | |
1580 | return TMR_ABORT_TASK_SET; | |
1581 | case SRP_TSK_CLEAR_TASK_SET: | |
1582 | return TMR_CLEAR_TASK_SET; | |
1583 | case SRP_TSK_LUN_RESET: | |
1584 | return TMR_LUN_RESET; | |
1585 | case SRP_TSK_CLEAR_ACA: | |
1586 | return TMR_CLEAR_ACA; | |
1587 | default: | |
1588 | return -1; | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | /** | |
1593 | * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit. | |
1594 | * | |
1595 | * Returns 0 if and only if the request will be processed by the target core. | |
1596 | * | |
1597 | * For more information about SRP_TSK_MGMT information units, see also section | |
1598 | * 6.7 in the SRP r16a document. | |
1599 | */ | |
1600 | static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch, | |
1601 | struct srpt_recv_ioctx *recv_ioctx, | |
1602 | struct srpt_send_ioctx *send_ioctx) | |
1603 | { | |
1604 | struct srp_tsk_mgmt *srp_tsk; | |
1605 | struct se_cmd *cmd; | |
3e4f5748 | 1606 | struct se_session *sess = ch->sess; |
a42d985b | 1607 | int tcm_tmr; |
3e4f5748 | 1608 | int rc; |
a42d985b BVA |
1609 | |
1610 | BUG_ON(!send_ioctx); | |
1611 | ||
1612 | srp_tsk = recv_ioctx->ioctx.buf; | |
1613 | cmd = &send_ioctx->cmd; | |
1614 | ||
1615 | pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld" | |
1616 | " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func, | |
1617 | srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess); | |
1618 | ||
1619 | srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT); | |
649ee054 | 1620 | send_ioctx->cmd.tag = srp_tsk->tag; |
a42d985b | 1621 | tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func); |
e1dd413c BVA |
1622 | rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, |
1623 | scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr, | |
1624 | GFP_KERNEL, srp_tsk->task_tag, | |
1625 | TARGET_SCF_ACK_KREF); | |
3e4f5748 NB |
1626 | if (rc != 0) { |
1627 | send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED; | |
de103c93 | 1628 | goto fail; |
a42d985b | 1629 | } |
de103c93 CH |
1630 | return; |
1631 | fail: | |
de103c93 | 1632 | transport_send_check_condition_and_sense(cmd, 0, 0); // XXX: |
a42d985b BVA |
1633 | } |
1634 | ||
1635 | /** | |
1636 | * srpt_handle_new_iu() - Process a newly received information unit. | |
1637 | * @ch: RDMA channel through which the information unit has been received. | |
1638 | * @ioctx: SRPT I/O context associated with the information unit. | |
1639 | */ | |
1640 | static void srpt_handle_new_iu(struct srpt_rdma_ch *ch, | |
1641 | struct srpt_recv_ioctx *recv_ioctx, | |
1642 | struct srpt_send_ioctx *send_ioctx) | |
1643 | { | |
1644 | struct srp_cmd *srp_cmd; | |
a42d985b BVA |
1645 | |
1646 | BUG_ON(!ch); | |
1647 | BUG_ON(!recv_ioctx); | |
1648 | ||
1649 | ib_dma_sync_single_for_cpu(ch->sport->sdev->device, | |
1650 | recv_ioctx->ioctx.dma, srp_max_req_size, | |
1651 | DMA_FROM_DEVICE); | |
1652 | ||
33912d73 | 1653 | if (unlikely(ch->state == CH_CONNECTING)) { |
a42d985b BVA |
1654 | list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list); |
1655 | goto out; | |
1656 | } | |
1657 | ||
33912d73 | 1658 | if (unlikely(ch->state != CH_LIVE)) |
a42d985b BVA |
1659 | goto out; |
1660 | ||
1661 | srp_cmd = recv_ioctx->ioctx.buf; | |
1662 | if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) { | |
1663 | if (!send_ioctx) | |
1664 | send_ioctx = srpt_get_send_ioctx(ch); | |
1665 | if (unlikely(!send_ioctx)) { | |
1666 | list_add_tail(&recv_ioctx->wait_list, | |
1667 | &ch->cmd_wait_list); | |
1668 | goto out; | |
1669 | } | |
1670 | } | |
1671 | ||
a42d985b BVA |
1672 | switch (srp_cmd->opcode) { |
1673 | case SRP_CMD: | |
1674 | srpt_handle_cmd(ch, recv_ioctx, send_ioctx); | |
1675 | break; | |
1676 | case SRP_TSK_MGMT: | |
1677 | srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx); | |
1678 | break; | |
1679 | case SRP_I_LOGOUT: | |
9f5d32af | 1680 | pr_err("Not yet implemented: SRP_I_LOGOUT\n"); |
a42d985b BVA |
1681 | break; |
1682 | case SRP_CRED_RSP: | |
1683 | pr_debug("received SRP_CRED_RSP\n"); | |
1684 | break; | |
1685 | case SRP_AER_RSP: | |
1686 | pr_debug("received SRP_AER_RSP\n"); | |
1687 | break; | |
1688 | case SRP_RSP: | |
9f5d32af | 1689 | pr_err("Received SRP_RSP\n"); |
a42d985b BVA |
1690 | break; |
1691 | default: | |
9f5d32af | 1692 | pr_err("received IU with unknown opcode 0x%x\n", |
a42d985b BVA |
1693 | srp_cmd->opcode); |
1694 | break; | |
1695 | } | |
1696 | ||
1697 | srpt_post_recv(ch->sport->sdev, recv_ioctx); | |
1698 | out: | |
1699 | return; | |
1700 | } | |
1701 | ||
59fae4de | 1702 | static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1703 | { |
59fae4de CH |
1704 | struct srpt_rdma_ch *ch = cq->cq_context; |
1705 | struct srpt_recv_ioctx *ioctx = | |
1706 | container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe); | |
a42d985b | 1707 | |
a42d985b BVA |
1708 | if (wc->status == IB_WC_SUCCESS) { |
1709 | int req_lim; | |
1710 | ||
1711 | req_lim = atomic_dec_return(&ch->req_lim); | |
1712 | if (unlikely(req_lim < 0)) | |
9f5d32af | 1713 | pr_err("req_lim = %d < 0\n", req_lim); |
a42d985b BVA |
1714 | srpt_handle_new_iu(ch, ioctx, NULL); |
1715 | } else { | |
59fae4de CH |
1716 | pr_info("receiving failed for ioctx %p with status %d\n", |
1717 | ioctx, wc->status); | |
a42d985b BVA |
1718 | } |
1719 | } | |
1720 | ||
539b3248 BVA |
1721 | /* |
1722 | * This function must be called from the context in which RDMA completions are | |
1723 | * processed because it accesses the wait list without protection against | |
1724 | * access from other threads. | |
1725 | */ | |
1726 | static void srpt_process_wait_list(struct srpt_rdma_ch *ch) | |
1727 | { | |
1728 | struct srpt_send_ioctx *ioctx; | |
1729 | ||
1730 | while (!list_empty(&ch->cmd_wait_list) && | |
1731 | ch->state >= CH_LIVE && | |
1732 | (ioctx = srpt_get_send_ioctx(ch)) != NULL) { | |
1733 | struct srpt_recv_ioctx *recv_ioctx; | |
1734 | ||
1735 | recv_ioctx = list_first_entry(&ch->cmd_wait_list, | |
1736 | struct srpt_recv_ioctx, | |
1737 | wait_list); | |
1738 | list_del(&recv_ioctx->wait_list); | |
1739 | srpt_handle_new_iu(ch, recv_ioctx, ioctx); | |
1740 | } | |
1741 | } | |
1742 | ||
a42d985b | 1743 | /** |
a42d985b BVA |
1744 | * Note: Although this has not yet been observed during tests, at least in |
1745 | * theory it is possible that the srpt_get_send_ioctx() call invoked by | |
1746 | * srpt_handle_new_iu() fails. This is possible because the req_lim_delta | |
1747 | * value in each response is set to one, and it is possible that this response | |
1748 | * makes the initiator send a new request before the send completion for that | |
1749 | * response has been processed. This could e.g. happen if the call to | |
1750 | * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or | |
1751 | * if IB retransmission causes generation of the send completion to be | |
1752 | * delayed. Incoming information units for which srpt_get_send_ioctx() fails | |
1753 | * are queued on cmd_wait_list. The code below processes these delayed | |
1754 | * requests one at a time. | |
1755 | */ | |
59fae4de | 1756 | static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1757 | { |
59fae4de CH |
1758 | struct srpt_rdma_ch *ch = cq->cq_context; |
1759 | struct srpt_send_ioctx *ioctx = | |
1760 | container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe); | |
1761 | enum srpt_command_state state; | |
a42d985b | 1762 | |
59fae4de CH |
1763 | state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); |
1764 | ||
1765 | WARN_ON(state != SRPT_STATE_CMD_RSP_SENT && | |
1766 | state != SRPT_STATE_MGMT_RSP_SENT); | |
1767 | ||
1768 | atomic_inc(&ch->sq_wr_avail); | |
1769 | ||
49f40163 | 1770 | if (wc->status != IB_WC_SUCCESS) |
59fae4de CH |
1771 | pr_info("sending response for ioctx 0x%p failed" |
1772 | " with status %d\n", ioctx, wc->status); | |
1773 | ||
59fae4de CH |
1774 | if (state != SRPT_STATE_DONE) { |
1775 | srpt_unmap_sg_to_ib_sge(ch, ioctx); | |
1776 | transport_generic_free_cmd(&ioctx->cmd, 0); | |
a42d985b | 1777 | } else { |
59fae4de CH |
1778 | pr_err("IB completion has been received too late for" |
1779 | " wr_id = %u.\n", ioctx->ioctx.index); | |
a42d985b BVA |
1780 | } |
1781 | ||
539b3248 | 1782 | srpt_process_wait_list(ch); |
a42d985b BVA |
1783 | } |
1784 | ||
a42d985b BVA |
1785 | /** |
1786 | * srpt_create_ch_ib() - Create receive and send completion queues. | |
1787 | */ | |
1788 | static int srpt_create_ch_ib(struct srpt_rdma_ch *ch) | |
1789 | { | |
1790 | struct ib_qp_init_attr *qp_init; | |
1791 | struct srpt_port *sport = ch->sport; | |
1792 | struct srpt_device *sdev = sport->sdev; | |
1793 | u32 srp_sq_size = sport->port_attrib.srp_sq_size; | |
1794 | int ret; | |
1795 | ||
1796 | WARN_ON(ch->rq_size < 1); | |
1797 | ||
1798 | ret = -ENOMEM; | |
9d2aa2b4 | 1799 | qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL); |
a42d985b BVA |
1800 | if (!qp_init) |
1801 | goto out; | |
1802 | ||
ab477c1f | 1803 | retry: |
59fae4de CH |
1804 | ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + srp_sq_size, |
1805 | 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE); | |
a42d985b BVA |
1806 | if (IS_ERR(ch->cq)) { |
1807 | ret = PTR_ERR(ch->cq); | |
9f5d32af | 1808 | pr_err("failed to create CQ cqe= %d ret= %d\n", |
a42d985b BVA |
1809 | ch->rq_size + srp_sq_size, ret); |
1810 | goto out; | |
1811 | } | |
1812 | ||
1813 | qp_init->qp_context = (void *)ch; | |
1814 | qp_init->event_handler | |
1815 | = (void(*)(struct ib_event *, void*))srpt_qp_event; | |
1816 | qp_init->send_cq = ch->cq; | |
1817 | qp_init->recv_cq = ch->cq; | |
1818 | qp_init->srq = sdev->srq; | |
1819 | qp_init->sq_sig_type = IB_SIGNAL_REQ_WR; | |
1820 | qp_init->qp_type = IB_QPT_RC; | |
1821 | qp_init->cap.max_send_wr = srp_sq_size; | |
1822 | qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE; | |
1823 | ||
1824 | ch->qp = ib_create_qp(sdev->pd, qp_init); | |
1825 | if (IS_ERR(ch->qp)) { | |
1826 | ret = PTR_ERR(ch->qp); | |
ab477c1f BVA |
1827 | if (ret == -ENOMEM) { |
1828 | srp_sq_size /= 2; | |
1829 | if (srp_sq_size >= MIN_SRPT_SQ_SIZE) { | |
1830 | ib_destroy_cq(ch->cq); | |
1831 | goto retry; | |
1832 | } | |
1833 | } | |
9f5d32af | 1834 | pr_err("failed to create_qp ret= %d\n", ret); |
a42d985b BVA |
1835 | goto err_destroy_cq; |
1836 | } | |
1837 | ||
1838 | atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr); | |
1839 | ||
1840 | pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n", | |
1841 | __func__, ch->cq->cqe, qp_init->cap.max_send_sge, | |
1842 | qp_init->cap.max_send_wr, ch->cm_id); | |
1843 | ||
1844 | ret = srpt_init_ch_qp(ch, ch->qp); | |
1845 | if (ret) | |
1846 | goto err_destroy_qp; | |
1847 | ||
a42d985b BVA |
1848 | out: |
1849 | kfree(qp_init); | |
1850 | return ret; | |
1851 | ||
1852 | err_destroy_qp: | |
1853 | ib_destroy_qp(ch->qp); | |
1854 | err_destroy_cq: | |
59fae4de | 1855 | ib_free_cq(ch->cq); |
a42d985b BVA |
1856 | goto out; |
1857 | } | |
1858 | ||
1859 | static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch) | |
1860 | { | |
a42d985b | 1861 | ib_destroy_qp(ch->qp); |
59fae4de | 1862 | ib_free_cq(ch->cq); |
a42d985b BVA |
1863 | } |
1864 | ||
1865 | /** | |
aaf45bd8 | 1866 | * srpt_close_ch() - Close an RDMA channel. |
a42d985b | 1867 | * |
aaf45bd8 BVA |
1868 | * Make sure all resources associated with the channel will be deallocated at |
1869 | * an appropriate time. | |
a42d985b | 1870 | * |
aaf45bd8 BVA |
1871 | * Returns true if and only if the channel state has been modified into |
1872 | * CH_DRAINING. | |
a42d985b | 1873 | */ |
aaf45bd8 | 1874 | static bool srpt_close_ch(struct srpt_rdma_ch *ch) |
a42d985b | 1875 | { |
aaf45bd8 | 1876 | int ret; |
a42d985b | 1877 | |
aaf45bd8 BVA |
1878 | if (!srpt_set_ch_state(ch, CH_DRAINING)) { |
1879 | pr_debug("%s-%d: already closed\n", ch->sess_name, | |
1880 | ch->qp->qp_num); | |
1881 | return false; | |
a42d985b | 1882 | } |
a42d985b | 1883 | |
aaf45bd8 | 1884 | kref_get(&ch->kref); |
a42d985b | 1885 | |
aaf45bd8 BVA |
1886 | ret = srpt_ch_qp_err(ch); |
1887 | if (ret < 0) | |
1888 | pr_err("%s-%d: changing queue pair into error state failed: %d\n", | |
1889 | ch->sess_name, ch->qp->qp_num, ret); | |
a42d985b | 1890 | |
aaf45bd8 BVA |
1891 | pr_debug("%s-%d: queued zerolength write\n", ch->sess_name, |
1892 | ch->qp->qp_num); | |
1893 | ret = srpt_zerolength_write(ch); | |
1894 | if (ret < 0) { | |
1895 | pr_err("%s-%d: queuing zero-length write failed: %d\n", | |
1896 | ch->sess_name, ch->qp->qp_num, ret); | |
1897 | if (srpt_set_ch_state(ch, CH_DISCONNECTED)) | |
1898 | schedule_work(&ch->release_work); | |
1899 | else | |
1900 | WARN_ON_ONCE(true); | |
1901 | } | |
a42d985b | 1902 | |
aaf45bd8 BVA |
1903 | kref_put(&ch->kref, srpt_free_ch); |
1904 | ||
1905 | return true; | |
1d19f780 NB |
1906 | } |
1907 | ||
aaf45bd8 BVA |
1908 | /* |
1909 | * Change the channel state into CH_DISCONNECTING. If a channel has not yet | |
1910 | * reached the connected state, close it. If a channel is in the connected | |
1911 | * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is | |
1912 | * the responsibility of the caller to ensure that this function is not | |
1913 | * invoked concurrently with the code that accepts a connection. This means | |
1914 | * that this function must either be invoked from inside a CM callback | |
1915 | * function or that it must be invoked with the srpt_port.mutex held. | |
a42d985b | 1916 | */ |
aaf45bd8 | 1917 | static int srpt_disconnect_ch(struct srpt_rdma_ch *ch) |
a42d985b | 1918 | { |
a42d985b | 1919 | int ret; |
a42d985b | 1920 | |
aaf45bd8 BVA |
1921 | if (!srpt_set_ch_state(ch, CH_DISCONNECTING)) |
1922 | return -ENOTCONN; | |
a42d985b | 1923 | |
aaf45bd8 BVA |
1924 | ret = ib_send_cm_dreq(ch->cm_id, NULL, 0); |
1925 | if (ret < 0) | |
1926 | ret = ib_send_cm_drep(ch->cm_id, NULL, 0); | |
a42d985b | 1927 | |
aaf45bd8 BVA |
1928 | if (ret < 0 && srpt_close_ch(ch)) |
1929 | ret = 0; | |
1d19f780 | 1930 | |
aaf45bd8 BVA |
1931 | return ret; |
1932 | } | |
1933 | ||
1934 | static void __srpt_close_all_ch(struct srpt_device *sdev) | |
1935 | { | |
1936 | struct srpt_rdma_ch *ch; | |
1937 | ||
1938 | lockdep_assert_held(&sdev->mutex); | |
1939 | ||
1940 | list_for_each_entry(ch, &sdev->rch_list, list) { | |
1941 | if (srpt_disconnect_ch(ch) >= 0) | |
1942 | pr_info("Closing channel %s-%d because target %s has been disabled\n", | |
1943 | ch->sess_name, ch->qp->qp_num, | |
1944 | sdev->device->name); | |
1945 | srpt_close_ch(ch); | |
a42d985b BVA |
1946 | } |
1947 | } | |
1948 | ||
a42d985b | 1949 | /** |
aaf45bd8 | 1950 | * srpt_shutdown_session() - Whether or not a session may be shut down. |
a42d985b | 1951 | */ |
aaf45bd8 | 1952 | static int srpt_shutdown_session(struct se_session *se_sess) |
a42d985b | 1953 | { |
aaf45bd8 BVA |
1954 | return 1; |
1955 | } | |
1956 | ||
1957 | static void srpt_free_ch(struct kref *kref) | |
1958 | { | |
1959 | struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref); | |
1960 | ||
1961 | kfree(ch); | |
a42d985b BVA |
1962 | } |
1963 | ||
1964 | static void srpt_release_channel_work(struct work_struct *w) | |
1965 | { | |
1966 | struct srpt_rdma_ch *ch; | |
1967 | struct srpt_device *sdev; | |
9474b043 | 1968 | struct se_session *se_sess; |
a42d985b BVA |
1969 | |
1970 | ch = container_of(w, struct srpt_rdma_ch, release_work); | |
f108f0f6 BVA |
1971 | pr_debug("%s: %s-%d; release_done = %p\n", __func__, ch->sess_name, |
1972 | ch->qp->qp_num, ch->release_done); | |
a42d985b BVA |
1973 | |
1974 | sdev = ch->sport->sdev; | |
1975 | BUG_ON(!sdev); | |
1976 | ||
9474b043 NB |
1977 | se_sess = ch->sess; |
1978 | BUG_ON(!se_sess); | |
1979 | ||
88936259 | 1980 | target_sess_cmd_list_set_waiting(se_sess); |
be646c2d | 1981 | target_wait_for_sess_cmds(se_sess); |
9474b043 NB |
1982 | |
1983 | transport_deregister_session_configfs(se_sess); | |
1984 | transport_deregister_session(se_sess); | |
a42d985b BVA |
1985 | ch->sess = NULL; |
1986 | ||
0b41d6ca NB |
1987 | ib_destroy_cm_id(ch->cm_id); |
1988 | ||
a42d985b BVA |
1989 | srpt_destroy_ch_ib(ch); |
1990 | ||
1991 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
1992 | ch->sport->sdev, ch->rq_size, | |
1993 | ch->rsp_size, DMA_TO_DEVICE); | |
1994 | ||
8628991f | 1995 | mutex_lock(&sdev->mutex); |
f108f0f6 | 1996 | list_del_init(&ch->list); |
a42d985b BVA |
1997 | if (ch->release_done) |
1998 | complete(ch->release_done); | |
8628991f | 1999 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
2000 | |
2001 | wake_up(&sdev->ch_releaseQ); | |
2002 | ||
aaf45bd8 | 2003 | kref_put(&ch->kref, srpt_free_ch); |
a42d985b BVA |
2004 | } |
2005 | ||
a42d985b BVA |
2006 | /** |
2007 | * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED. | |
2008 | * | |
2009 | * Ownership of the cm_id is transferred to the target session if this | |
2010 | * functions returns zero. Otherwise the caller remains the owner of cm_id. | |
2011 | */ | |
2012 | static int srpt_cm_req_recv(struct ib_cm_id *cm_id, | |
2013 | struct ib_cm_req_event_param *param, | |
2014 | void *private_data) | |
2015 | { | |
2016 | struct srpt_device *sdev = cm_id->context; | |
2017 | struct srpt_port *sport = &sdev->port[param->port - 1]; | |
2018 | struct srp_login_req *req; | |
2019 | struct srp_login_rsp *rsp; | |
2020 | struct srp_login_rej *rej; | |
2021 | struct ib_cm_rep_param *rep_param; | |
2022 | struct srpt_rdma_ch *ch, *tmp_ch; | |
a42d985b | 2023 | u32 it_iu_len; |
0fd10721 | 2024 | int ret = 0; |
f246c941 | 2025 | unsigned char *p; |
a42d985b BVA |
2026 | |
2027 | WARN_ON_ONCE(irqs_disabled()); | |
2028 | ||
2029 | if (WARN_ON(!sdev || !private_data)) | |
2030 | return -EINVAL; | |
2031 | ||
2032 | req = (struct srp_login_req *)private_data; | |
2033 | ||
2034 | it_iu_len = be32_to_cpu(req->req_it_iu_len); | |
2035 | ||
9f5d32af DL |
2036 | pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx," |
2037 | " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d" | |
2038 | " (guid=0x%llx:0x%llx)\n", | |
2039 | be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]), | |
2040 | be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]), | |
2041 | be64_to_cpu(*(__be64 *)&req->target_port_id[0]), | |
2042 | be64_to_cpu(*(__be64 *)&req->target_port_id[8]), | |
2043 | it_iu_len, | |
2044 | param->port, | |
2045 | be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]), | |
2046 | be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8])); | |
a42d985b | 2047 | |
9d2aa2b4 BVA |
2048 | rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); |
2049 | rej = kzalloc(sizeof(*rej), GFP_KERNEL); | |
2050 | rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL); | |
a42d985b BVA |
2051 | |
2052 | if (!rsp || !rej || !rep_param) { | |
2053 | ret = -ENOMEM; | |
2054 | goto out; | |
2055 | } | |
2056 | ||
2057 | if (it_iu_len > srp_max_req_size || it_iu_len < 64) { | |
b356c1c1 VT |
2058 | rej->reason = cpu_to_be32( |
2059 | SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE); | |
a42d985b | 2060 | ret = -EINVAL; |
9f5d32af | 2061 | pr_err("rejected SRP_LOGIN_REQ because its" |
a42d985b BVA |
2062 | " length (%d bytes) is out of range (%d .. %d)\n", |
2063 | it_iu_len, 64, srp_max_req_size); | |
2064 | goto reject; | |
2065 | } | |
2066 | ||
2067 | if (!sport->enabled) { | |
b356c1c1 VT |
2068 | rej->reason = cpu_to_be32( |
2069 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
a42d985b | 2070 | ret = -EINVAL; |
9f5d32af | 2071 | pr_err("rejected SRP_LOGIN_REQ because the target port" |
a42d985b BVA |
2072 | " has not yet been enabled\n"); |
2073 | goto reject; | |
2074 | } | |
2075 | ||
2076 | if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) { | |
2077 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN; | |
2078 | ||
8628991f | 2079 | mutex_lock(&sdev->mutex); |
a42d985b BVA |
2080 | |
2081 | list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) { | |
2082 | if (!memcmp(ch->i_port_id, req->initiator_port_id, 16) | |
2083 | && !memcmp(ch->t_port_id, req->target_port_id, 16) | |
2084 | && param->port == ch->sport->port | |
2085 | && param->listen_id == ch->sport->sdev->cm_id | |
2086 | && ch->cm_id) { | |
aaf45bd8 | 2087 | if (srpt_disconnect_ch(ch) < 0) |
a42d985b | 2088 | continue; |
aaf45bd8 BVA |
2089 | pr_info("Relogin - closed existing channel %s\n", |
2090 | ch->sess_name); | |
a42d985b BVA |
2091 | rsp->rsp_flags = |
2092 | SRP_LOGIN_RSP_MULTICHAN_TERMINATED; | |
2093 | } | |
2094 | } | |
2095 | ||
8628991f | 2096 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
2097 | |
2098 | } else | |
2099 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED; | |
2100 | ||
2101 | if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid) | |
2102 | || *(__be64 *)(req->target_port_id + 8) != | |
2103 | cpu_to_be64(srpt_service_guid)) { | |
b356c1c1 VT |
2104 | rej->reason = cpu_to_be32( |
2105 | SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL); | |
a42d985b | 2106 | ret = -ENOMEM; |
9f5d32af | 2107 | pr_err("rejected SRP_LOGIN_REQ because it" |
a42d985b BVA |
2108 | " has an invalid target port identifier.\n"); |
2109 | goto reject; | |
2110 | } | |
2111 | ||
9d2aa2b4 | 2112 | ch = kzalloc(sizeof(*ch), GFP_KERNEL); |
a42d985b | 2113 | if (!ch) { |
b356c1c1 VT |
2114 | rej->reason = cpu_to_be32( |
2115 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
9f5d32af | 2116 | pr_err("rejected SRP_LOGIN_REQ because no memory.\n"); |
a42d985b BVA |
2117 | ret = -ENOMEM; |
2118 | goto reject; | |
2119 | } | |
2120 | ||
aaf45bd8 BVA |
2121 | kref_init(&ch->kref); |
2122 | ch->zw_cqe.done = srpt_zerolength_write_done; | |
a42d985b BVA |
2123 | INIT_WORK(&ch->release_work, srpt_release_channel_work); |
2124 | memcpy(ch->i_port_id, req->initiator_port_id, 16); | |
2125 | memcpy(ch->t_port_id, req->target_port_id, 16); | |
2126 | ch->sport = &sdev->port[param->port - 1]; | |
2127 | ch->cm_id = cm_id; | |
2739b592 | 2128 | cm_id->context = ch; |
a42d985b BVA |
2129 | /* |
2130 | * Avoid QUEUE_FULL conditions by limiting the number of buffers used | |
2131 | * for the SRP protocol to the command queue size. | |
2132 | */ | |
2133 | ch->rq_size = SRPT_RQ_SIZE; | |
2134 | spin_lock_init(&ch->spinlock); | |
2135 | ch->state = CH_CONNECTING; | |
2136 | INIT_LIST_HEAD(&ch->cmd_wait_list); | |
2137 | ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size; | |
2138 | ||
2139 | ch->ioctx_ring = (struct srpt_send_ioctx **) | |
2140 | srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, | |
2141 | sizeof(*ch->ioctx_ring[0]), | |
2142 | ch->rsp_size, DMA_TO_DEVICE); | |
2143 | if (!ch->ioctx_ring) | |
2144 | goto free_ch; | |
2145 | ||
a42d985b BVA |
2146 | ret = srpt_create_ch_ib(ch); |
2147 | if (ret) { | |
b356c1c1 VT |
2148 | rej->reason = cpu_to_be32( |
2149 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
9f5d32af | 2150 | pr_err("rejected SRP_LOGIN_REQ because creating" |
a42d985b BVA |
2151 | " a new RDMA channel failed.\n"); |
2152 | goto free_ring; | |
2153 | } | |
2154 | ||
2155 | ret = srpt_ch_qp_rtr(ch, ch->qp); | |
2156 | if (ret) { | |
b356c1c1 | 2157 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
9f5d32af | 2158 | pr_err("rejected SRP_LOGIN_REQ because enabling" |
a42d985b BVA |
2159 | " RTR failed (error code = %d)\n", ret); |
2160 | goto destroy_ib; | |
2161 | } | |
f246c941 | 2162 | |
a42d985b | 2163 | /* |
f246c941 NB |
2164 | * Use the initator port identifier as the session name, when |
2165 | * checking against se_node_acl->initiatorname[] this can be | |
2166 | * with or without preceeding '0x'. | |
a42d985b BVA |
2167 | */ |
2168 | snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx", | |
2169 | be64_to_cpu(*(__be64 *)ch->i_port_id), | |
2170 | be64_to_cpu(*(__be64 *)(ch->i_port_id + 8))); | |
2171 | ||
2172 | pr_debug("registering session %s\n", ch->sess_name); | |
f246c941 | 2173 | p = &ch->sess_name[0]; |
a42d985b | 2174 | |
f246c941 | 2175 | try_again: |
0fd10721 NB |
2176 | ch->sess = target_alloc_session(&sport->port_tpg_1, ch->rq_size, |
2177 | sizeof(struct srpt_send_ioctx), | |
b42057ab NB |
2178 | TARGET_PROT_NORMAL, p, ch, NULL); |
2179 | if (IS_ERR(ch->sess)) { | |
f246c941 | 2180 | pr_info("Rejected login because no ACL has been" |
b42057ab | 2181 | " configured yet for initiator %s.\n", p); |
f246c941 NB |
2182 | /* |
2183 | * XXX: Hack to retry of ch->i_port_id without leading '0x' | |
2184 | */ | |
2185 | if (p == &ch->sess_name[0]) { | |
2186 | p += 2; | |
2187 | goto try_again; | |
2188 | } | |
b42057ab NB |
2189 | rej->reason = cpu_to_be32((PTR_ERR(ch->sess) == -ENOMEM) ? |
2190 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES : | |
f246c941 | 2191 | SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED); |
f246c941 | 2192 | goto destroy_ib; |
a42d985b | 2193 | } |
a42d985b BVA |
2194 | |
2195 | pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess, | |
2196 | ch->sess_name, ch->cm_id); | |
2197 | ||
2198 | /* create srp_login_response */ | |
2199 | rsp->opcode = SRP_LOGIN_RSP; | |
2200 | rsp->tag = req->tag; | |
2201 | rsp->max_it_iu_len = req->req_it_iu_len; | |
2202 | rsp->max_ti_iu_len = req->req_it_iu_len; | |
2203 | ch->max_ti_iu_len = it_iu_len; | |
b356c1c1 VT |
2204 | rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2205 | | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b BVA |
2206 | rsp->req_lim_delta = cpu_to_be32(ch->rq_size); |
2207 | atomic_set(&ch->req_lim, ch->rq_size); | |
2208 | atomic_set(&ch->req_lim_delta, 0); | |
2209 | ||
2210 | /* create cm reply */ | |
2211 | rep_param->qp_num = ch->qp->qp_num; | |
2212 | rep_param->private_data = (void *)rsp; | |
9d2aa2b4 | 2213 | rep_param->private_data_len = sizeof(*rsp); |
a42d985b BVA |
2214 | rep_param->rnr_retry_count = 7; |
2215 | rep_param->flow_control = 1; | |
2216 | rep_param->failover_accepted = 0; | |
2217 | rep_param->srq = 1; | |
2218 | rep_param->responder_resources = 4; | |
2219 | rep_param->initiator_depth = 4; | |
2220 | ||
2221 | ret = ib_send_cm_rep(cm_id, rep_param); | |
2222 | if (ret) { | |
9f5d32af | 2223 | pr_err("sending SRP_LOGIN_REQ response failed" |
a42d985b BVA |
2224 | " (error code = %d)\n", ret); |
2225 | goto release_channel; | |
2226 | } | |
2227 | ||
8628991f | 2228 | mutex_lock(&sdev->mutex); |
a42d985b | 2229 | list_add_tail(&ch->list, &sdev->rch_list); |
8628991f | 2230 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
2231 | |
2232 | goto out; | |
2233 | ||
2234 | release_channel: | |
aaf45bd8 | 2235 | srpt_disconnect_ch(ch); |
a42d985b | 2236 | transport_deregister_session_configfs(ch->sess); |
a42d985b BVA |
2237 | transport_deregister_session(ch->sess); |
2238 | ch->sess = NULL; | |
2239 | ||
2240 | destroy_ib: | |
2241 | srpt_destroy_ch_ib(ch); | |
2242 | ||
2243 | free_ring: | |
2244 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
2245 | ch->sport->sdev, ch->rq_size, | |
2246 | ch->rsp_size, DMA_TO_DEVICE); | |
2247 | free_ch: | |
2248 | kfree(ch); | |
2249 | ||
2250 | reject: | |
2251 | rej->opcode = SRP_LOGIN_REJ; | |
2252 | rej->tag = req->tag; | |
b356c1c1 VT |
2253 | rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2254 | | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b BVA |
2255 | |
2256 | ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, | |
9d2aa2b4 | 2257 | (void *)rej, sizeof(*rej)); |
a42d985b BVA |
2258 | |
2259 | out: | |
2260 | kfree(rep_param); | |
2261 | kfree(rsp); | |
2262 | kfree(rej); | |
2263 | ||
2264 | return ret; | |
2265 | } | |
2266 | ||
2739b592 BVA |
2267 | static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch, |
2268 | enum ib_cm_rej_reason reason, | |
2269 | const u8 *private_data, | |
2270 | u8 private_data_len) | |
a42d985b | 2271 | { |
c13c90ea BVA |
2272 | char *priv = NULL; |
2273 | int i; | |
2274 | ||
2275 | if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1, | |
2276 | GFP_KERNEL))) { | |
2277 | for (i = 0; i < private_data_len; i++) | |
2278 | sprintf(priv + 3 * i, " %02x", private_data[i]); | |
2279 | } | |
2280 | pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n", | |
2281 | ch->sess_name, ch->qp->qp_num, reason, private_data_len ? | |
2282 | "; private data" : "", priv ? priv : " (?)"); | |
2283 | kfree(priv); | |
a42d985b BVA |
2284 | } |
2285 | ||
2286 | /** | |
2287 | * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event. | |
2288 | * | |
2289 | * An IB_CM_RTU_RECEIVED message indicates that the connection is established | |
2290 | * and that the recipient may begin transmitting (RTU = ready to use). | |
2291 | */ | |
2739b592 | 2292 | static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch) |
a42d985b | 2293 | { |
a42d985b BVA |
2294 | int ret; |
2295 | ||
f130c220 | 2296 | if (srpt_set_ch_state(ch, CH_LIVE)) { |
a42d985b BVA |
2297 | ret = srpt_ch_qp_rts(ch, ch->qp); |
2298 | ||
387add46 BVA |
2299 | if (ret == 0) { |
2300 | /* Trigger wait list processing. */ | |
2301 | ret = srpt_zerolength_write(ch); | |
2302 | WARN_ONCE(ret < 0, "%d\n", ret); | |
2303 | } else { | |
a42d985b | 2304 | srpt_close_ch(ch); |
387add46 | 2305 | } |
a42d985b BVA |
2306 | } |
2307 | } | |
2308 | ||
a42d985b BVA |
2309 | /** |
2310 | * srpt_cm_handler() - IB connection manager callback function. | |
2311 | * | |
2312 | * A non-zero return value will cause the caller destroy the CM ID. | |
2313 | * | |
2314 | * Note: srpt_cm_handler() must only return a non-zero value when transferring | |
2315 | * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning | |
2316 | * a non-zero value in any other case will trigger a race with the | |
2317 | * ib_destroy_cm_id() call in srpt_release_channel(). | |
2318 | */ | |
2319 | static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
2320 | { | |
2739b592 | 2321 | struct srpt_rdma_ch *ch = cm_id->context; |
a42d985b BVA |
2322 | int ret; |
2323 | ||
2324 | ret = 0; | |
2325 | switch (event->event) { | |
2326 | case IB_CM_REQ_RECEIVED: | |
2327 | ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd, | |
2328 | event->private_data); | |
2329 | break; | |
2330 | case IB_CM_REJ_RECEIVED: | |
2739b592 BVA |
2331 | srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason, |
2332 | event->private_data, | |
2333 | IB_CM_REJ_PRIVATE_DATA_SIZE); | |
a42d985b BVA |
2334 | break; |
2335 | case IB_CM_RTU_RECEIVED: | |
2336 | case IB_CM_USER_ESTABLISHED: | |
2739b592 | 2337 | srpt_cm_rtu_recv(ch); |
a42d985b BVA |
2338 | break; |
2339 | case IB_CM_DREQ_RECEIVED: | |
aaf45bd8 | 2340 | srpt_disconnect_ch(ch); |
a42d985b BVA |
2341 | break; |
2342 | case IB_CM_DREP_RECEIVED: | |
2739b592 BVA |
2343 | pr_info("Received CM DREP message for ch %s-%d.\n", |
2344 | ch->sess_name, ch->qp->qp_num); | |
aaf45bd8 | 2345 | srpt_close_ch(ch); |
a42d985b BVA |
2346 | break; |
2347 | case IB_CM_TIMEWAIT_EXIT: | |
2739b592 BVA |
2348 | pr_info("Received CM TimeWait exit for ch %s-%d.\n", |
2349 | ch->sess_name, ch->qp->qp_num); | |
aaf45bd8 | 2350 | srpt_close_ch(ch); |
a42d985b BVA |
2351 | break; |
2352 | case IB_CM_REP_ERROR: | |
2739b592 BVA |
2353 | pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
2354 | ch->qp->qp_num); | |
a42d985b BVA |
2355 | break; |
2356 | case IB_CM_DREQ_ERROR: | |
1e20a2a5 | 2357 | pr_info("Received CM DREQ ERROR event.\n"); |
a42d985b BVA |
2358 | break; |
2359 | case IB_CM_MRA_RECEIVED: | |
1e20a2a5 | 2360 | pr_info("Received CM MRA event\n"); |
a42d985b BVA |
2361 | break; |
2362 | default: | |
1e20a2a5 | 2363 | pr_err("received unrecognized CM event %d\n", event->event); |
a42d985b BVA |
2364 | break; |
2365 | } | |
2366 | ||
2367 | return ret; | |
2368 | } | |
2369 | ||
2370 | /** | |
2371 | * srpt_perform_rdmas() - Perform IB RDMA. | |
2372 | * | |
2373 | * Returns zero upon success or a negative number upon failure. | |
2374 | */ | |
2375 | static int srpt_perform_rdmas(struct srpt_rdma_ch *ch, | |
2376 | struct srpt_send_ioctx *ioctx) | |
2377 | { | |
a42d985b | 2378 | struct ib_send_wr *bad_wr; |
59fae4de | 2379 | int sq_wr_avail, ret, i; |
a42d985b BVA |
2380 | enum dma_data_direction dir; |
2381 | const int n_rdma = ioctx->n_rdma; | |
2382 | ||
2383 | dir = ioctx->cmd.data_direction; | |
2384 | if (dir == DMA_TO_DEVICE) { | |
2385 | /* write */ | |
2386 | ret = -ENOMEM; | |
2387 | sq_wr_avail = atomic_sub_return(n_rdma, &ch->sq_wr_avail); | |
2388 | if (sq_wr_avail < 0) { | |
9f5d32af DL |
2389 | pr_warn("IB send queue full (needed %d)\n", |
2390 | n_rdma); | |
a42d985b BVA |
2391 | goto out; |
2392 | } | |
2393 | } | |
2394 | ||
59fae4de CH |
2395 | for (i = 0; i < n_rdma; i++) { |
2396 | struct ib_send_wr *wr = &ioctx->rdma_wrs[i].wr; | |
a42d985b | 2397 | |
59fae4de CH |
2398 | wr->opcode = (dir == DMA_FROM_DEVICE) ? |
2399 | IB_WR_RDMA_WRITE : IB_WR_RDMA_READ; | |
a42d985b | 2400 | |
59fae4de CH |
2401 | if (i == n_rdma - 1) { |
2402 | /* only get completion event for the last rdma read */ | |
2403 | if (dir == DMA_TO_DEVICE) { | |
2404 | wr->send_flags = IB_SEND_SIGNALED; | |
2405 | ioctx->rdma_cqe.done = srpt_rdma_read_done; | |
2406 | } else { | |
2407 | ioctx->rdma_cqe.done = srpt_rdma_write_done; | |
2408 | } | |
2409 | wr->wr_cqe = &ioctx->rdma_cqe; | |
2410 | wr->next = NULL; | |
2411 | } else { | |
2412 | wr->wr_cqe = NULL; | |
2413 | wr->next = &ioctx->rdma_wrs[i + 1].wr; | |
2414 | } | |
a42d985b BVA |
2415 | } |
2416 | ||
59fae4de | 2417 | ret = ib_post_send(ch->qp, &ioctx->rdma_wrs->wr, &bad_wr); |
a42d985b | 2418 | if (ret) |
9f5d32af | 2419 | pr_err("%s[%d]: ib_post_send() returned %d for %d/%d\n", |
a42d985b | 2420 | __func__, __LINE__, ret, i, n_rdma); |
a42d985b BVA |
2421 | out: |
2422 | if (unlikely(dir == DMA_TO_DEVICE && ret < 0)) | |
2423 | atomic_add(n_rdma, &ch->sq_wr_avail); | |
2424 | return ret; | |
2425 | } | |
2426 | ||
2427 | /** | |
2428 | * srpt_xfer_data() - Start data transfer from initiator to target. | |
2429 | */ | |
2430 | static int srpt_xfer_data(struct srpt_rdma_ch *ch, | |
2431 | struct srpt_send_ioctx *ioctx) | |
2432 | { | |
2433 | int ret; | |
2434 | ||
2435 | ret = srpt_map_sg_to_ib_sge(ch, ioctx); | |
2436 | if (ret) { | |
9f5d32af | 2437 | pr_err("%s[%d] ret=%d\n", __func__, __LINE__, ret); |
a42d985b BVA |
2438 | goto out; |
2439 | } | |
2440 | ||
2441 | ret = srpt_perform_rdmas(ch, ioctx); | |
2442 | if (ret) { | |
2443 | if (ret == -EAGAIN || ret == -ENOMEM) | |
9f5d32af DL |
2444 | pr_info("%s[%d] queue full -- ret=%d\n", |
2445 | __func__, __LINE__, ret); | |
a42d985b | 2446 | else |
9f5d32af | 2447 | pr_err("%s[%d] fatal error -- ret=%d\n", |
a42d985b BVA |
2448 | __func__, __LINE__, ret); |
2449 | goto out_unmap; | |
2450 | } | |
2451 | ||
2452 | out: | |
2453 | return ret; | |
2454 | out_unmap: | |
2455 | srpt_unmap_sg_to_ib_sge(ch, ioctx); | |
2456 | goto out; | |
2457 | } | |
2458 | ||
2459 | static int srpt_write_pending_status(struct se_cmd *se_cmd) | |
2460 | { | |
2461 | struct srpt_send_ioctx *ioctx; | |
2462 | ||
2463 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2464 | return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA; | |
2465 | } | |
2466 | ||
2467 | /* | |
2468 | * srpt_write_pending() - Start data transfer from initiator to target (write). | |
2469 | */ | |
2470 | static int srpt_write_pending(struct se_cmd *se_cmd) | |
2471 | { | |
fc3af58d BVA |
2472 | struct srpt_send_ioctx *ioctx = |
2473 | container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2474 | struct srpt_rdma_ch *ch = ioctx->ch; | |
a42d985b | 2475 | enum srpt_command_state new_state; |
a42d985b BVA |
2476 | |
2477 | new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA); | |
2478 | WARN_ON(new_state == SRPT_STATE_DONE); | |
fc3af58d | 2479 | return srpt_xfer_data(ch, ioctx); |
a42d985b BVA |
2480 | } |
2481 | ||
2482 | static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status) | |
2483 | { | |
2484 | switch (tcm_mgmt_status) { | |
2485 | case TMR_FUNCTION_COMPLETE: | |
2486 | return SRP_TSK_MGMT_SUCCESS; | |
2487 | case TMR_FUNCTION_REJECTED: | |
2488 | return SRP_TSK_MGMT_FUNC_NOT_SUPP; | |
2489 | } | |
2490 | return SRP_TSK_MGMT_FAILED; | |
2491 | } | |
2492 | ||
2493 | /** | |
2494 | * srpt_queue_response() - Transmits the response to a SCSI command. | |
2495 | * | |
2496 | * Callback function called by the TCM core. Must not block since it can be | |
2497 | * invoked on the context of the IB completion handler. | |
2498 | */ | |
b79fafac | 2499 | static void srpt_queue_response(struct se_cmd *cmd) |
a42d985b BVA |
2500 | { |
2501 | struct srpt_rdma_ch *ch; | |
2502 | struct srpt_send_ioctx *ioctx; | |
2503 | enum srpt_command_state state; | |
2504 | unsigned long flags; | |
2505 | int ret; | |
2506 | enum dma_data_direction dir; | |
2507 | int resp_len; | |
2508 | u8 srp_tm_status; | |
2509 | ||
a42d985b BVA |
2510 | ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); |
2511 | ch = ioctx->ch; | |
2512 | BUG_ON(!ch); | |
2513 | ||
2514 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
2515 | state = ioctx->state; | |
2516 | switch (state) { | |
2517 | case SRPT_STATE_NEW: | |
2518 | case SRPT_STATE_DATA_IN: | |
2519 | ioctx->state = SRPT_STATE_CMD_RSP_SENT; | |
2520 | break; | |
2521 | case SRPT_STATE_MGMT: | |
2522 | ioctx->state = SRPT_STATE_MGMT_RSP_SENT; | |
2523 | break; | |
2524 | default: | |
2525 | WARN(true, "ch %p; cmd %d: unexpected command state %d\n", | |
2526 | ch, ioctx->ioctx.index, ioctx->state); | |
2527 | break; | |
2528 | } | |
2529 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
2530 | ||
2531 | if (unlikely(transport_check_aborted_status(&ioctx->cmd, false) | |
2532 | || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) { | |
2533 | atomic_inc(&ch->req_lim_delta); | |
2534 | srpt_abort_cmd(ioctx); | |
b79fafac | 2535 | return; |
a42d985b BVA |
2536 | } |
2537 | ||
2538 | dir = ioctx->cmd.data_direction; | |
2539 | ||
2540 | /* For read commands, transfer the data to the initiator. */ | |
2541 | if (dir == DMA_FROM_DEVICE && ioctx->cmd.data_length && | |
2542 | !ioctx->queue_status_only) { | |
2543 | ret = srpt_xfer_data(ch, ioctx); | |
2544 | if (ret) { | |
9f5d32af | 2545 | pr_err("xfer_data failed for tag %llu\n", |
649ee054 | 2546 | ioctx->cmd.tag); |
b79fafac | 2547 | return; |
a42d985b BVA |
2548 | } |
2549 | } | |
2550 | ||
2551 | if (state != SRPT_STATE_MGMT) | |
649ee054 | 2552 | resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag, |
a42d985b BVA |
2553 | cmd->scsi_status); |
2554 | else { | |
2555 | srp_tm_status | |
2556 | = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response); | |
2557 | resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status, | |
649ee054 | 2558 | ioctx->cmd.tag); |
a42d985b BVA |
2559 | } |
2560 | ret = srpt_post_send(ch, ioctx, resp_len); | |
2561 | if (ret) { | |
9f5d32af | 2562 | pr_err("sending cmd response failed for tag %llu\n", |
649ee054 | 2563 | ioctx->cmd.tag); |
a42d985b BVA |
2564 | srpt_unmap_sg_to_ib_sge(ch, ioctx); |
2565 | srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); | |
afc16604 | 2566 | target_put_sess_cmd(&ioctx->cmd); |
a42d985b | 2567 | } |
b79fafac | 2568 | } |
a42d985b | 2569 | |
b79fafac JE |
2570 | static int srpt_queue_data_in(struct se_cmd *cmd) |
2571 | { | |
2572 | srpt_queue_response(cmd); | |
2573 | return 0; | |
2574 | } | |
2575 | ||
2576 | static void srpt_queue_tm_rsp(struct se_cmd *cmd) | |
2577 | { | |
2578 | srpt_queue_response(cmd); | |
a42d985b BVA |
2579 | } |
2580 | ||
131e6abc NB |
2581 | static void srpt_aborted_task(struct se_cmd *cmd) |
2582 | { | |
2583 | struct srpt_send_ioctx *ioctx = container_of(cmd, | |
2584 | struct srpt_send_ioctx, cmd); | |
2585 | ||
2586 | srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx); | |
2587 | } | |
2588 | ||
a42d985b BVA |
2589 | static int srpt_queue_status(struct se_cmd *cmd) |
2590 | { | |
2591 | struct srpt_send_ioctx *ioctx; | |
2592 | ||
2593 | ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); | |
2594 | BUG_ON(ioctx->sense_data != cmd->sense_buffer); | |
2595 | if (cmd->se_cmd_flags & | |
2596 | (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE)) | |
2597 | WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION); | |
2598 | ioctx->queue_status_only = true; | |
b79fafac JE |
2599 | srpt_queue_response(cmd); |
2600 | return 0; | |
a42d985b BVA |
2601 | } |
2602 | ||
2603 | static void srpt_refresh_port_work(struct work_struct *work) | |
2604 | { | |
2605 | struct srpt_port *sport = container_of(work, struct srpt_port, work); | |
2606 | ||
2607 | srpt_refresh_port(sport); | |
2608 | } | |
2609 | ||
a42d985b BVA |
2610 | /** |
2611 | * srpt_release_sdev() - Free the channel resources associated with a target. | |
2612 | */ | |
2613 | static int srpt_release_sdev(struct srpt_device *sdev) | |
2614 | { | |
aaf45bd8 | 2615 | int i, res; |
a42d985b BVA |
2616 | |
2617 | WARN_ON_ONCE(irqs_disabled()); | |
2618 | ||
2619 | BUG_ON(!sdev); | |
2620 | ||
8628991f | 2621 | mutex_lock(&sdev->mutex); |
aaf45bd8 BVA |
2622 | for (i = 0; i < ARRAY_SIZE(sdev->port); i++) |
2623 | sdev->port[i].enabled = false; | |
2624 | __srpt_close_all_ch(sdev); | |
8628991f | 2625 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
2626 | |
2627 | res = wait_event_interruptible(sdev->ch_releaseQ, | |
8628991f | 2628 | list_empty_careful(&sdev->rch_list)); |
a42d985b | 2629 | if (res) |
9f5d32af | 2630 | pr_err("%s: interrupted.\n", __func__); |
a42d985b BVA |
2631 | |
2632 | return 0; | |
2633 | } | |
2634 | ||
2635 | static struct srpt_port *__srpt_lookup_port(const char *name) | |
2636 | { | |
2637 | struct ib_device *dev; | |
2638 | struct srpt_device *sdev; | |
2639 | struct srpt_port *sport; | |
2640 | int i; | |
2641 | ||
2642 | list_for_each_entry(sdev, &srpt_dev_list, list) { | |
2643 | dev = sdev->device; | |
2644 | if (!dev) | |
2645 | continue; | |
2646 | ||
2647 | for (i = 0; i < dev->phys_port_cnt; i++) { | |
2648 | sport = &sdev->port[i]; | |
2649 | ||
2650 | if (!strcmp(sport->port_guid, name)) | |
2651 | return sport; | |
2652 | } | |
2653 | } | |
2654 | ||
2655 | return NULL; | |
2656 | } | |
2657 | ||
2658 | static struct srpt_port *srpt_lookup_port(const char *name) | |
2659 | { | |
2660 | struct srpt_port *sport; | |
2661 | ||
2662 | spin_lock(&srpt_dev_lock); | |
2663 | sport = __srpt_lookup_port(name); | |
2664 | spin_unlock(&srpt_dev_lock); | |
2665 | ||
2666 | return sport; | |
2667 | } | |
2668 | ||
2669 | /** | |
2670 | * srpt_add_one() - Infiniband device addition callback function. | |
2671 | */ | |
2672 | static void srpt_add_one(struct ib_device *device) | |
2673 | { | |
2674 | struct srpt_device *sdev; | |
2675 | struct srpt_port *sport; | |
2676 | struct ib_srq_init_attr srq_attr; | |
2677 | int i; | |
2678 | ||
2679 | pr_debug("device = %p, device->dma_ops = %p\n", device, | |
2680 | device->dma_ops); | |
2681 | ||
9d2aa2b4 | 2682 | sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); |
a42d985b BVA |
2683 | if (!sdev) |
2684 | goto err; | |
2685 | ||
2686 | sdev->device = device; | |
2687 | INIT_LIST_HEAD(&sdev->rch_list); | |
2688 | init_waitqueue_head(&sdev->ch_releaseQ); | |
8628991f | 2689 | mutex_init(&sdev->mutex); |
a42d985b | 2690 | |
a42d985b BVA |
2691 | sdev->pd = ib_alloc_pd(device); |
2692 | if (IS_ERR(sdev->pd)) | |
2693 | goto free_dev; | |
2694 | ||
4a061b28 | 2695 | sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr); |
a42d985b BVA |
2696 | |
2697 | srq_attr.event_handler = srpt_srq_event; | |
2698 | srq_attr.srq_context = (void *)sdev; | |
2699 | srq_attr.attr.max_wr = sdev->srq_size; | |
2700 | srq_attr.attr.max_sge = 1; | |
2701 | srq_attr.attr.srq_limit = 0; | |
6f360336 | 2702 | srq_attr.srq_type = IB_SRQT_BASIC; |
a42d985b BVA |
2703 | |
2704 | sdev->srq = ib_create_srq(sdev->pd, &srq_attr); | |
2705 | if (IS_ERR(sdev->srq)) | |
5a783956 | 2706 | goto err_pd; |
a42d985b BVA |
2707 | |
2708 | pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n", | |
4a061b28 | 2709 | __func__, sdev->srq_size, sdev->device->attrs.max_srq_wr, |
a42d985b BVA |
2710 | device->name); |
2711 | ||
2712 | if (!srpt_service_guid) | |
2713 | srpt_service_guid = be64_to_cpu(device->node_guid); | |
2714 | ||
2715 | sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev); | |
2716 | if (IS_ERR(sdev->cm_id)) | |
2717 | goto err_srq; | |
2718 | ||
2719 | /* print out target login information */ | |
2720 | pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx," | |
2721 | "pkey=ffff,service_id=%016llx\n", srpt_service_guid, | |
2722 | srpt_service_guid, srpt_service_guid); | |
2723 | ||
2724 | /* | |
2725 | * We do not have a consistent service_id (ie. also id_ext of target_id) | |
2726 | * to identify this target. We currently use the guid of the first HCA | |
2727 | * in the system as service_id; therefore, the target_id will change | |
2728 | * if this HCA is gone bad and replaced by different HCA | |
2729 | */ | |
73fec7fd | 2730 | if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0)) |
a42d985b BVA |
2731 | goto err_cm; |
2732 | ||
2733 | INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device, | |
2734 | srpt_event_handler); | |
2735 | if (ib_register_event_handler(&sdev->event_handler)) | |
2736 | goto err_cm; | |
2737 | ||
2738 | sdev->ioctx_ring = (struct srpt_recv_ioctx **) | |
2739 | srpt_alloc_ioctx_ring(sdev, sdev->srq_size, | |
2740 | sizeof(*sdev->ioctx_ring[0]), | |
2741 | srp_max_req_size, DMA_FROM_DEVICE); | |
2742 | if (!sdev->ioctx_ring) | |
2743 | goto err_event; | |
2744 | ||
2745 | for (i = 0; i < sdev->srq_size; ++i) | |
2746 | srpt_post_recv(sdev, sdev->ioctx_ring[i]); | |
2747 | ||
f225066b | 2748 | WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port)); |
a42d985b BVA |
2749 | |
2750 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
2751 | sport = &sdev->port[i - 1]; | |
2752 | sport->sdev = sdev; | |
2753 | sport->port = i; | |
2754 | sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE; | |
2755 | sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE; | |
2756 | sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE; | |
2757 | INIT_WORK(&sport->work, srpt_refresh_port_work); | |
a42d985b BVA |
2758 | |
2759 | if (srpt_refresh_port(sport)) { | |
9f5d32af | 2760 | pr_err("MAD registration failed for %s-%d.\n", |
f68cba4e | 2761 | sdev->device->name, i); |
a42d985b BVA |
2762 | goto err_ring; |
2763 | } | |
2764 | snprintf(sport->port_guid, sizeof(sport->port_guid), | |
2765 | "0x%016llx%016llx", | |
2766 | be64_to_cpu(sport->gid.global.subnet_prefix), | |
2767 | be64_to_cpu(sport->gid.global.interface_id)); | |
2768 | } | |
2769 | ||
2770 | spin_lock(&srpt_dev_lock); | |
2771 | list_add_tail(&sdev->list, &srpt_dev_list); | |
2772 | spin_unlock(&srpt_dev_lock); | |
2773 | ||
2774 | out: | |
2775 | ib_set_client_data(device, &srpt_client, sdev); | |
2776 | pr_debug("added %s.\n", device->name); | |
2777 | return; | |
2778 | ||
2779 | err_ring: | |
2780 | srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, | |
2781 | sdev->srq_size, srp_max_req_size, | |
2782 | DMA_FROM_DEVICE); | |
2783 | err_event: | |
2784 | ib_unregister_event_handler(&sdev->event_handler); | |
2785 | err_cm: | |
2786 | ib_destroy_cm_id(sdev->cm_id); | |
2787 | err_srq: | |
2788 | ib_destroy_srq(sdev->srq); | |
a42d985b BVA |
2789 | err_pd: |
2790 | ib_dealloc_pd(sdev->pd); | |
2791 | free_dev: | |
2792 | kfree(sdev); | |
2793 | err: | |
2794 | sdev = NULL; | |
9f5d32af | 2795 | pr_info("%s(%s) failed.\n", __func__, device->name); |
a42d985b BVA |
2796 | goto out; |
2797 | } | |
2798 | ||
2799 | /** | |
2800 | * srpt_remove_one() - InfiniBand device removal callback function. | |
2801 | */ | |
7c1eb45a | 2802 | static void srpt_remove_one(struct ib_device *device, void *client_data) |
a42d985b | 2803 | { |
7c1eb45a | 2804 | struct srpt_device *sdev = client_data; |
a42d985b BVA |
2805 | int i; |
2806 | ||
a42d985b | 2807 | if (!sdev) { |
9f5d32af | 2808 | pr_info("%s(%s): nothing to do.\n", __func__, device->name); |
a42d985b BVA |
2809 | return; |
2810 | } | |
2811 | ||
2812 | srpt_unregister_mad_agent(sdev); | |
2813 | ||
2814 | ib_unregister_event_handler(&sdev->event_handler); | |
2815 | ||
2816 | /* Cancel any work queued by the just unregistered IB event handler. */ | |
2817 | for (i = 0; i < sdev->device->phys_port_cnt; i++) | |
2818 | cancel_work_sync(&sdev->port[i].work); | |
2819 | ||
2820 | ib_destroy_cm_id(sdev->cm_id); | |
2821 | ||
2822 | /* | |
2823 | * Unregistering a target must happen after destroying sdev->cm_id | |
2824 | * such that no new SRP_LOGIN_REQ information units can arrive while | |
2825 | * destroying the target. | |
2826 | */ | |
2827 | spin_lock(&srpt_dev_lock); | |
2828 | list_del(&sdev->list); | |
2829 | spin_unlock(&srpt_dev_lock); | |
2830 | srpt_release_sdev(sdev); | |
2831 | ||
2832 | ib_destroy_srq(sdev->srq); | |
a42d985b BVA |
2833 | ib_dealloc_pd(sdev->pd); |
2834 | ||
2835 | srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, | |
2836 | sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE); | |
2837 | sdev->ioctx_ring = NULL; | |
2838 | kfree(sdev); | |
2839 | } | |
2840 | ||
2841 | static struct ib_client srpt_client = { | |
2842 | .name = DRV_NAME, | |
2843 | .add = srpt_add_one, | |
2844 | .remove = srpt_remove_one | |
2845 | }; | |
2846 | ||
2847 | static int srpt_check_true(struct se_portal_group *se_tpg) | |
2848 | { | |
2849 | return 1; | |
2850 | } | |
2851 | ||
2852 | static int srpt_check_false(struct se_portal_group *se_tpg) | |
2853 | { | |
2854 | return 0; | |
2855 | } | |
2856 | ||
2857 | static char *srpt_get_fabric_name(void) | |
2858 | { | |
2859 | return "srpt"; | |
2860 | } | |
2861 | ||
a42d985b BVA |
2862 | static char *srpt_get_fabric_wwn(struct se_portal_group *tpg) |
2863 | { | |
2864 | struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1); | |
2865 | ||
2866 | return sport->port_guid; | |
2867 | } | |
2868 | ||
2869 | static u16 srpt_get_tag(struct se_portal_group *tpg) | |
2870 | { | |
2871 | return 1; | |
2872 | } | |
2873 | ||
a42d985b BVA |
2874 | static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg) |
2875 | { | |
2876 | return 1; | |
2877 | } | |
2878 | ||
2879 | static void srpt_release_cmd(struct se_cmd *se_cmd) | |
2880 | { | |
9474b043 NB |
2881 | struct srpt_send_ioctx *ioctx = container_of(se_cmd, |
2882 | struct srpt_send_ioctx, cmd); | |
2883 | struct srpt_rdma_ch *ch = ioctx->ch; | |
0fd10721 | 2884 | struct se_session *se_sess = ch->sess; |
9474b043 NB |
2885 | |
2886 | WARN_ON(ioctx->state != SRPT_STATE_DONE); | |
2887 | WARN_ON(ioctx->mapped_sg_count != 0); | |
2888 | ||
2889 | if (ioctx->n_rbuf > 1) { | |
2890 | kfree(ioctx->rbufs); | |
2891 | ioctx->rbufs = NULL; | |
2892 | ioctx->n_rbuf = 0; | |
2893 | } | |
2894 | ||
0fd10721 | 2895 | percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag); |
a42d985b BVA |
2896 | } |
2897 | ||
a42d985b BVA |
2898 | /** |
2899 | * srpt_close_session() - Forcibly close a session. | |
2900 | * | |
2901 | * Callback function invoked by the TCM core to clean up sessions associated | |
2902 | * with a node ACL when the user invokes | |
2903 | * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
2904 | */ | |
2905 | static void srpt_close_session(struct se_session *se_sess) | |
2906 | { | |
2907 | DECLARE_COMPLETION_ONSTACK(release_done); | |
f108f0f6 BVA |
2908 | struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr; |
2909 | struct srpt_device *sdev = ch->sport->sdev; | |
2910 | bool wait; | |
a42d985b | 2911 | |
f108f0f6 BVA |
2912 | pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num, |
2913 | ch->state); | |
a42d985b | 2914 | |
8628991f | 2915 | mutex_lock(&sdev->mutex); |
a42d985b BVA |
2916 | BUG_ON(ch->release_done); |
2917 | ch->release_done = &release_done; | |
f108f0f6 | 2918 | wait = !list_empty(&ch->list); |
aaf45bd8 | 2919 | srpt_disconnect_ch(ch); |
8628991f | 2920 | mutex_unlock(&sdev->mutex); |
a42d985b | 2921 | |
f108f0f6 BVA |
2922 | if (!wait) |
2923 | return; | |
2924 | ||
2925 | while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0) | |
2926 | pr_info("%s(%s-%d state %d): still waiting ...\n", __func__, | |
2927 | ch->sess_name, ch->qp->qp_num, ch->state); | |
a42d985b BVA |
2928 | } |
2929 | ||
a42d985b BVA |
2930 | /** |
2931 | * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB). | |
2932 | * | |
2933 | * A quote from RFC 4455 (SCSI-MIB) about this MIB object: | |
2934 | * This object represents an arbitrary integer used to uniquely identify a | |
2935 | * particular attached remote initiator port to a particular SCSI target port | |
2936 | * within a particular SCSI target device within a particular SCSI instance. | |
2937 | */ | |
2938 | static u32 srpt_sess_get_index(struct se_session *se_sess) | |
2939 | { | |
2940 | return 0; | |
2941 | } | |
2942 | ||
2943 | static void srpt_set_default_node_attrs(struct se_node_acl *nacl) | |
2944 | { | |
2945 | } | |
2946 | ||
a42d985b BVA |
2947 | /* Note: only used from inside debug printk's by the TCM core. */ |
2948 | static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd) | |
2949 | { | |
2950 | struct srpt_send_ioctx *ioctx; | |
2951 | ||
2952 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2953 | return srpt_get_cmd_state(ioctx); | |
2954 | } | |
2955 | ||
a42d985b BVA |
2956 | /** |
2957 | * srpt_parse_i_port_id() - Parse an initiator port ID. | |
2958 | * @name: ASCII representation of a 128-bit initiator port ID. | |
2959 | * @i_port_id: Binary 128-bit port ID. | |
2960 | */ | |
2961 | static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name) | |
2962 | { | |
2963 | const char *p; | |
2964 | unsigned len, count, leading_zero_bytes; | |
2965 | int ret, rc; | |
2966 | ||
2967 | p = name; | |
b60459f0 | 2968 | if (strncasecmp(p, "0x", 2) == 0) |
a42d985b BVA |
2969 | p += 2; |
2970 | ret = -EINVAL; | |
2971 | len = strlen(p); | |
2972 | if (len % 2) | |
2973 | goto out; | |
2974 | count = min(len / 2, 16U); | |
2975 | leading_zero_bytes = 16 - count; | |
2976 | memset(i_port_id, 0, leading_zero_bytes); | |
2977 | rc = hex2bin(i_port_id + leading_zero_bytes, p, count); | |
2978 | if (rc < 0) | |
2979 | pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc); | |
2980 | ret = 0; | |
2981 | out: | |
2982 | return ret; | |
2983 | } | |
2984 | ||
2985 | /* | |
2986 | * configfs callback function invoked for | |
2987 | * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
2988 | */ | |
c7d6a803 | 2989 | static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name) |
a42d985b | 2990 | { |
a42d985b BVA |
2991 | u8 i_port_id[16]; |
2992 | ||
2993 | if (srpt_parse_i_port_id(i_port_id, name) < 0) { | |
9f5d32af | 2994 | pr_err("invalid initiator port ID %s\n", name); |
c7d6a803 | 2995 | return -EINVAL; |
a42d985b | 2996 | } |
c7d6a803 | 2997 | return 0; |
a42d985b BVA |
2998 | } |
2999 | ||
2eafd729 CH |
3000 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item, |
3001 | char *page) | |
a42d985b | 3002 | { |
2eafd729 | 3003 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3004 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3005 | ||
3006 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size); | |
3007 | } | |
3008 | ||
2eafd729 CH |
3009 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item, |
3010 | const char *page, size_t count) | |
a42d985b | 3011 | { |
2eafd729 | 3012 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3013 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3014 | unsigned long val; | |
3015 | int ret; | |
3016 | ||
9d8abf45 | 3017 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3018 | if (ret < 0) { |
9d8abf45 | 3019 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3020 | return -EINVAL; |
3021 | } | |
3022 | if (val > MAX_SRPT_RDMA_SIZE) { | |
3023 | pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val, | |
3024 | MAX_SRPT_RDMA_SIZE); | |
3025 | return -EINVAL; | |
3026 | } | |
3027 | if (val < DEFAULT_MAX_RDMA_SIZE) { | |
3028 | pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n", | |
3029 | val, DEFAULT_MAX_RDMA_SIZE); | |
3030 | return -EINVAL; | |
3031 | } | |
3032 | sport->port_attrib.srp_max_rdma_size = val; | |
3033 | ||
3034 | return count; | |
3035 | } | |
3036 | ||
2eafd729 CH |
3037 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item, |
3038 | char *page) | |
a42d985b | 3039 | { |
2eafd729 | 3040 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3041 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3042 | ||
3043 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size); | |
3044 | } | |
3045 | ||
2eafd729 CH |
3046 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item, |
3047 | const char *page, size_t count) | |
a42d985b | 3048 | { |
2eafd729 | 3049 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3050 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3051 | unsigned long val; | |
3052 | int ret; | |
3053 | ||
9d8abf45 | 3054 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3055 | if (ret < 0) { |
9d8abf45 | 3056 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3057 | return -EINVAL; |
3058 | } | |
3059 | if (val > MAX_SRPT_RSP_SIZE) { | |
3060 | pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val, | |
3061 | MAX_SRPT_RSP_SIZE); | |
3062 | return -EINVAL; | |
3063 | } | |
3064 | if (val < MIN_MAX_RSP_SIZE) { | |
3065 | pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val, | |
3066 | MIN_MAX_RSP_SIZE); | |
3067 | return -EINVAL; | |
3068 | } | |
3069 | sport->port_attrib.srp_max_rsp_size = val; | |
3070 | ||
3071 | return count; | |
3072 | } | |
3073 | ||
2eafd729 CH |
3074 | static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item, |
3075 | char *page) | |
a42d985b | 3076 | { |
2eafd729 | 3077 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3078 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3079 | ||
3080 | return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size); | |
3081 | } | |
3082 | ||
2eafd729 CH |
3083 | static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item, |
3084 | const char *page, size_t count) | |
a42d985b | 3085 | { |
2eafd729 | 3086 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
a42d985b BVA |
3087 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3088 | unsigned long val; | |
3089 | int ret; | |
3090 | ||
9d8abf45 | 3091 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3092 | if (ret < 0) { |
9d8abf45 | 3093 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3094 | return -EINVAL; |
3095 | } | |
3096 | if (val > MAX_SRPT_SRQ_SIZE) { | |
3097 | pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val, | |
3098 | MAX_SRPT_SRQ_SIZE); | |
3099 | return -EINVAL; | |
3100 | } | |
3101 | if (val < MIN_SRPT_SRQ_SIZE) { | |
3102 | pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val, | |
3103 | MIN_SRPT_SRQ_SIZE); | |
3104 | return -EINVAL; | |
3105 | } | |
3106 | sport->port_attrib.srp_sq_size = val; | |
3107 | ||
3108 | return count; | |
3109 | } | |
3110 | ||
2eafd729 CH |
3111 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size); |
3112 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size); | |
3113 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size); | |
a42d985b BVA |
3114 | |
3115 | static struct configfs_attribute *srpt_tpg_attrib_attrs[] = { | |
2eafd729 CH |
3116 | &srpt_tpg_attrib_attr_srp_max_rdma_size, |
3117 | &srpt_tpg_attrib_attr_srp_max_rsp_size, | |
3118 | &srpt_tpg_attrib_attr_srp_sq_size, | |
a42d985b BVA |
3119 | NULL, |
3120 | }; | |
3121 | ||
2eafd729 | 3122 | static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page) |
a42d985b | 3123 | { |
2eafd729 | 3124 | struct se_portal_group *se_tpg = to_tpg(item); |
a42d985b BVA |
3125 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
3126 | ||
3127 | return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0); | |
3128 | } | |
3129 | ||
2eafd729 CH |
3130 | static ssize_t srpt_tpg_enable_store(struct config_item *item, |
3131 | const char *page, size_t count) | |
a42d985b | 3132 | { |
2eafd729 | 3133 | struct se_portal_group *se_tpg = to_tpg(item); |
a42d985b | 3134 | struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1); |
043a6806 BVA |
3135 | struct srpt_device *sdev = sport->sdev; |
3136 | struct srpt_rdma_ch *ch; | |
a42d985b BVA |
3137 | unsigned long tmp; |
3138 | int ret; | |
3139 | ||
9d8abf45 | 3140 | ret = kstrtoul(page, 0, &tmp); |
a42d985b | 3141 | if (ret < 0) { |
9f5d32af | 3142 | pr_err("Unable to extract srpt_tpg_store_enable\n"); |
a42d985b BVA |
3143 | return -EINVAL; |
3144 | } | |
3145 | ||
3146 | if ((tmp != 0) && (tmp != 1)) { | |
9f5d32af | 3147 | pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp); |
a42d985b BVA |
3148 | return -EINVAL; |
3149 | } | |
043a6806 BVA |
3150 | if (sport->enabled == tmp) |
3151 | goto out; | |
3152 | sport->enabled = tmp; | |
3153 | if (sport->enabled) | |
3154 | goto out; | |
a42d985b | 3155 | |
043a6806 BVA |
3156 | mutex_lock(&sdev->mutex); |
3157 | list_for_each_entry(ch, &sdev->rch_list, list) { | |
3158 | if (ch->sport == sport) { | |
3159 | pr_debug("%s: ch %p %s-%d\n", __func__, ch, | |
3160 | ch->sess_name, ch->qp->qp_num); | |
3161 | srpt_disconnect_ch(ch); | |
3162 | srpt_close_ch(ch); | |
3163 | } | |
3164 | } | |
3165 | mutex_unlock(&sdev->mutex); | |
3166 | ||
3167 | out: | |
a42d985b BVA |
3168 | return count; |
3169 | } | |
3170 | ||
2eafd729 | 3171 | CONFIGFS_ATTR(srpt_tpg_, enable); |
a42d985b BVA |
3172 | |
3173 | static struct configfs_attribute *srpt_tpg_attrs[] = { | |
2eafd729 | 3174 | &srpt_tpg_attr_enable, |
a42d985b BVA |
3175 | NULL, |
3176 | }; | |
3177 | ||
3178 | /** | |
3179 | * configfs callback invoked for | |
3180 | * mkdir /sys/kernel/config/target/$driver/$port/$tpg | |
3181 | */ | |
3182 | static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn, | |
3183 | struct config_group *group, | |
3184 | const char *name) | |
3185 | { | |
3186 | struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn); | |
3187 | int res; | |
3188 | ||
3189 | /* Initialize sport->port_wwn and sport->port_tpg_1 */ | |
bc0c94b1 | 3190 | res = core_tpg_register(&sport->port_wwn, &sport->port_tpg_1, SCSI_PROTOCOL_SRP); |
a42d985b BVA |
3191 | if (res) |
3192 | return ERR_PTR(res); | |
3193 | ||
3194 | return &sport->port_tpg_1; | |
3195 | } | |
3196 | ||
3197 | /** | |
3198 | * configfs callback invoked for | |
3199 | * rmdir /sys/kernel/config/target/$driver/$port/$tpg | |
3200 | */ | |
3201 | static void srpt_drop_tpg(struct se_portal_group *tpg) | |
3202 | { | |
3203 | struct srpt_port *sport = container_of(tpg, | |
3204 | struct srpt_port, port_tpg_1); | |
3205 | ||
3206 | sport->enabled = false; | |
3207 | core_tpg_deregister(&sport->port_tpg_1); | |
3208 | } | |
3209 | ||
3210 | /** | |
3211 | * configfs callback invoked for | |
3212 | * mkdir /sys/kernel/config/target/$driver/$port | |
3213 | */ | |
3214 | static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf, | |
3215 | struct config_group *group, | |
3216 | const char *name) | |
3217 | { | |
3218 | struct srpt_port *sport; | |
3219 | int ret; | |
3220 | ||
3221 | sport = srpt_lookup_port(name); | |
3222 | pr_debug("make_tport(%s)\n", name); | |
3223 | ret = -EINVAL; | |
3224 | if (!sport) | |
3225 | goto err; | |
3226 | ||
3227 | return &sport->port_wwn; | |
3228 | ||
3229 | err: | |
3230 | return ERR_PTR(ret); | |
3231 | } | |
3232 | ||
3233 | /** | |
3234 | * configfs callback invoked for | |
3235 | * rmdir /sys/kernel/config/target/$driver/$port | |
3236 | */ | |
3237 | static void srpt_drop_tport(struct se_wwn *wwn) | |
3238 | { | |
3239 | struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn); | |
3240 | ||
3241 | pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item)); | |
3242 | } | |
3243 | ||
2eafd729 | 3244 | static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf) |
a42d985b BVA |
3245 | { |
3246 | return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION); | |
3247 | } | |
3248 | ||
2eafd729 | 3249 | CONFIGFS_ATTR_RO(srpt_wwn_, version); |
a42d985b BVA |
3250 | |
3251 | static struct configfs_attribute *srpt_wwn_attrs[] = { | |
2eafd729 | 3252 | &srpt_wwn_attr_version, |
a42d985b BVA |
3253 | NULL, |
3254 | }; | |
3255 | ||
9ac8928e CH |
3256 | static const struct target_core_fabric_ops srpt_template = { |
3257 | .module = THIS_MODULE, | |
3258 | .name = "srpt", | |
a42d985b | 3259 | .get_fabric_name = srpt_get_fabric_name, |
a42d985b BVA |
3260 | .tpg_get_wwn = srpt_get_fabric_wwn, |
3261 | .tpg_get_tag = srpt_get_tag, | |
a42d985b BVA |
3262 | .tpg_check_demo_mode = srpt_check_false, |
3263 | .tpg_check_demo_mode_cache = srpt_check_true, | |
3264 | .tpg_check_demo_mode_write_protect = srpt_check_true, | |
3265 | .tpg_check_prod_mode_write_protect = srpt_check_false, | |
a42d985b BVA |
3266 | .tpg_get_inst_index = srpt_tpg_get_inst_index, |
3267 | .release_cmd = srpt_release_cmd, | |
3268 | .check_stop_free = srpt_check_stop_free, | |
3269 | .shutdown_session = srpt_shutdown_session, | |
3270 | .close_session = srpt_close_session, | |
a42d985b BVA |
3271 | .sess_get_index = srpt_sess_get_index, |
3272 | .sess_get_initiator_sid = NULL, | |
3273 | .write_pending = srpt_write_pending, | |
3274 | .write_pending_status = srpt_write_pending_status, | |
3275 | .set_default_node_attributes = srpt_set_default_node_attrs, | |
a42d985b | 3276 | .get_cmd_state = srpt_get_tcm_cmd_state, |
b79fafac | 3277 | .queue_data_in = srpt_queue_data_in, |
a42d985b | 3278 | .queue_status = srpt_queue_status, |
b79fafac | 3279 | .queue_tm_rsp = srpt_queue_tm_rsp, |
131e6abc | 3280 | .aborted_task = srpt_aborted_task, |
a42d985b BVA |
3281 | /* |
3282 | * Setup function pointers for generic logic in | |
3283 | * target_core_fabric_configfs.c | |
3284 | */ | |
3285 | .fabric_make_wwn = srpt_make_tport, | |
3286 | .fabric_drop_wwn = srpt_drop_tport, | |
3287 | .fabric_make_tpg = srpt_make_tpg, | |
3288 | .fabric_drop_tpg = srpt_drop_tpg, | |
c7d6a803 | 3289 | .fabric_init_nodeacl = srpt_init_nodeacl, |
9ac8928e CH |
3290 | |
3291 | .tfc_wwn_attrs = srpt_wwn_attrs, | |
3292 | .tfc_tpg_base_attrs = srpt_tpg_attrs, | |
3293 | .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs, | |
a42d985b BVA |
3294 | }; |
3295 | ||
3296 | /** | |
3297 | * srpt_init_module() - Kernel module initialization. | |
3298 | * | |
3299 | * Note: Since ib_register_client() registers callback functions, and since at | |
3300 | * least one of these callback functions (srpt_add_one()) calls target core | |
3301 | * functions, this driver must be registered with the target core before | |
3302 | * ib_register_client() is called. | |
3303 | */ | |
3304 | static int __init srpt_init_module(void) | |
3305 | { | |
3306 | int ret; | |
3307 | ||
3308 | ret = -EINVAL; | |
3309 | if (srp_max_req_size < MIN_MAX_REQ_SIZE) { | |
9f5d32af | 3310 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3311 | " srp_max_req_size -- must be at least %d.\n", |
3312 | srp_max_req_size, MIN_MAX_REQ_SIZE); | |
3313 | goto out; | |
3314 | } | |
3315 | ||
3316 | if (srpt_srq_size < MIN_SRPT_SRQ_SIZE | |
3317 | || srpt_srq_size > MAX_SRPT_SRQ_SIZE) { | |
9f5d32af | 3318 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3319 | " srpt_srq_size -- must be in the range [%d..%d].\n", |
3320 | srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE); | |
3321 | goto out; | |
3322 | } | |
3323 | ||
9ac8928e CH |
3324 | ret = target_register_template(&srpt_template); |
3325 | if (ret) | |
a42d985b | 3326 | goto out; |
a42d985b BVA |
3327 | |
3328 | ret = ib_register_client(&srpt_client); | |
3329 | if (ret) { | |
9f5d32af | 3330 | pr_err("couldn't register IB client\n"); |
a42d985b BVA |
3331 | goto out_unregister_target; |
3332 | } | |
3333 | ||
3334 | return 0; | |
3335 | ||
3336 | out_unregister_target: | |
9ac8928e | 3337 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3338 | out: |
3339 | return ret; | |
3340 | } | |
3341 | ||
3342 | static void __exit srpt_cleanup_module(void) | |
3343 | { | |
3344 | ib_unregister_client(&srpt_client); | |
9ac8928e | 3345 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3346 | } |
3347 | ||
3348 | module_init(srpt_init_module); | |
3349 | module_exit(srpt_cleanup_module); |