]>
Commit | Line | Data |
---|---|---|
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 | ||
e4dca7b7 | 83 | static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp) |
a42d985b BVA |
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; | |
a42d985b | 257 | |
507f6afa | 258 | ib_set_cpi_resp_time(cif, 20); |
a42d985b BVA |
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; | |
dea26209 | 298 | int send_queue_depth; |
a42d985b BVA |
299 | |
300 | iocp = (struct ib_dm_ioc_profile *)mad->data; | |
301 | ||
302 | if (!slot || slot > 16) { | |
303 | mad->mad_hdr.status | |
b356c1c1 | 304 | = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
a42d985b BVA |
305 | return; |
306 | } | |
307 | ||
308 | if (slot > 2) { | |
309 | mad->mad_hdr.status | |
b356c1c1 | 310 | = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
a42d985b BVA |
311 | return; |
312 | } | |
313 | ||
dea26209 BVA |
314 | if (sdev->use_srq) |
315 | send_queue_depth = sdev->srq_size; | |
316 | else | |
317 | send_queue_depth = min(SRPT_RQ_SIZE, | |
318 | sdev->device->attrs.max_qp_wr); | |
319 | ||
9d2aa2b4 | 320 | memset(iocp, 0, sizeof(*iocp)); |
a42d985b BVA |
321 | strcpy(iocp->id_string, SRPT_ID_STRING); |
322 | iocp->guid = cpu_to_be64(srpt_service_guid); | |
4a061b28 OG |
323 | iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); |
324 | iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id); | |
325 | iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver); | |
326 | iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); | |
a42d985b | 327 | iocp->subsys_device_id = 0x0; |
b356c1c1 VT |
328 | iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS); |
329 | iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS); | |
330 | iocp->protocol = cpu_to_be16(SRP_PROTOCOL); | |
331 | iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION); | |
dea26209 | 332 | iocp->send_queue_depth = cpu_to_be16(send_queue_depth); |
a42d985b BVA |
333 | iocp->rdma_read_depth = 4; |
334 | iocp->send_size = cpu_to_be32(srp_max_req_size); | |
335 | iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size, | |
336 | 1U << 24)); | |
337 | iocp->num_svc_entries = 1; | |
338 | iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC | | |
339 | SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC; | |
340 | ||
341 | mad->mad_hdr.status = 0; | |
342 | } | |
343 | ||
344 | /** | |
345 | * srpt_get_svc_entries() - Write ServiceEntries to a management datagram. | |
346 | * | |
347 | * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture | |
348 | * Specification. See also section B.7, table B.8 in the SRP r16a document. | |
349 | */ | |
350 | static void srpt_get_svc_entries(u64 ioc_guid, | |
351 | u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad) | |
352 | { | |
353 | struct ib_dm_svc_entries *svc_entries; | |
354 | ||
355 | WARN_ON(!ioc_guid); | |
356 | ||
357 | if (!slot || slot > 16) { | |
358 | mad->mad_hdr.status | |
b356c1c1 | 359 | = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
a42d985b BVA |
360 | return; |
361 | } | |
362 | ||
363 | if (slot > 2 || lo > hi || hi > 1) { | |
364 | mad->mad_hdr.status | |
b356c1c1 | 365 | = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
a42d985b BVA |
366 | return; |
367 | } | |
368 | ||
369 | svc_entries = (struct ib_dm_svc_entries *)mad->data; | |
9d2aa2b4 | 370 | memset(svc_entries, 0, sizeof(*svc_entries)); |
a42d985b BVA |
371 | svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid); |
372 | snprintf(svc_entries->service_entries[0].name, | |
373 | sizeof(svc_entries->service_entries[0].name), | |
374 | "%s%016llx", | |
375 | SRP_SERVICE_NAME_PREFIX, | |
376 | ioc_guid); | |
377 | ||
378 | mad->mad_hdr.status = 0; | |
379 | } | |
380 | ||
381 | /** | |
382 | * srpt_mgmt_method_get() - Process a received management datagram. | |
383 | * @sp: source port through which the MAD has been received. | |
384 | * @rq_mad: received MAD. | |
385 | * @rsp_mad: response MAD. | |
386 | */ | |
387 | static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad, | |
388 | struct ib_dm_mad *rsp_mad) | |
389 | { | |
390 | u16 attr_id; | |
391 | u32 slot; | |
392 | u8 hi, lo; | |
393 | ||
394 | attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id); | |
395 | switch (attr_id) { | |
396 | case DM_ATTR_CLASS_PORT_INFO: | |
397 | srpt_get_class_port_info(rsp_mad); | |
398 | break; | |
399 | case DM_ATTR_IOU_INFO: | |
400 | srpt_get_iou(rsp_mad); | |
401 | break; | |
402 | case DM_ATTR_IOC_PROFILE: | |
403 | slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); | |
404 | srpt_get_ioc(sp, slot, rsp_mad); | |
405 | break; | |
406 | case DM_ATTR_SVC_ENTRIES: | |
407 | slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); | |
408 | hi = (u8) ((slot >> 8) & 0xff); | |
409 | lo = (u8) (slot & 0xff); | |
410 | slot = (u16) ((slot >> 16) & 0xffff); | |
411 | srpt_get_svc_entries(srpt_service_guid, | |
412 | slot, hi, lo, rsp_mad); | |
413 | break; | |
414 | default: | |
415 | rsp_mad->mad_hdr.status = | |
b356c1c1 | 416 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
a42d985b BVA |
417 | break; |
418 | } | |
419 | } | |
420 | ||
421 | /** | |
422 | * srpt_mad_send_handler() - Post MAD-send callback function. | |
423 | */ | |
424 | static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent, | |
425 | struct ib_mad_send_wc *mad_wc) | |
426 | { | |
36523159 | 427 | rdma_destroy_ah(mad_wc->send_buf->ah); |
a42d985b BVA |
428 | ib_free_send_mad(mad_wc->send_buf); |
429 | } | |
430 | ||
431 | /** | |
432 | * srpt_mad_recv_handler() - MAD reception callback function. | |
433 | */ | |
434 | static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent, | |
ca281265 | 435 | struct ib_mad_send_buf *send_buf, |
a42d985b BVA |
436 | struct ib_mad_recv_wc *mad_wc) |
437 | { | |
438 | struct srpt_port *sport = (struct srpt_port *)mad_agent->context; | |
439 | struct ib_ah *ah; | |
440 | struct ib_mad_send_buf *rsp; | |
441 | struct ib_dm_mad *dm_mad; | |
442 | ||
443 | if (!mad_wc || !mad_wc->recv_buf.mad) | |
444 | return; | |
445 | ||
446 | ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc, | |
447 | mad_wc->recv_buf.grh, mad_agent->port_num); | |
448 | if (IS_ERR(ah)) | |
449 | goto err; | |
450 | ||
451 | BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR); | |
452 | ||
453 | rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp, | |
454 | mad_wc->wc->pkey_index, 0, | |
455 | IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA, | |
da2dfaa3 IW |
456 | GFP_KERNEL, |
457 | IB_MGMT_BASE_VERSION); | |
a42d985b BVA |
458 | if (IS_ERR(rsp)) |
459 | goto err_rsp; | |
460 | ||
461 | rsp->ah = ah; | |
462 | ||
463 | dm_mad = rsp->mad; | |
9d2aa2b4 | 464 | memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad)); |
a42d985b BVA |
465 | dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP; |
466 | dm_mad->mad_hdr.status = 0; | |
467 | ||
468 | switch (mad_wc->recv_buf.mad->mad_hdr.method) { | |
469 | case IB_MGMT_METHOD_GET: | |
470 | srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad); | |
471 | break; | |
472 | case IB_MGMT_METHOD_SET: | |
473 | dm_mad->mad_hdr.status = | |
b356c1c1 | 474 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
a42d985b BVA |
475 | break; |
476 | default: | |
477 | dm_mad->mad_hdr.status = | |
b356c1c1 | 478 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD); |
a42d985b BVA |
479 | break; |
480 | } | |
481 | ||
482 | if (!ib_post_send_mad(rsp, NULL)) { | |
483 | ib_free_recv_mad(mad_wc); | |
484 | /* will destroy_ah & free_send_mad in send completion */ | |
485 | return; | |
486 | } | |
487 | ||
488 | ib_free_send_mad(rsp); | |
489 | ||
490 | err_rsp: | |
36523159 | 491 | rdma_destroy_ah(ah); |
a42d985b BVA |
492 | err: |
493 | ib_free_recv_mad(mad_wc); | |
494 | } | |
495 | ||
496 | /** | |
497 | * srpt_refresh_port() - Configure a HCA port. | |
498 | * | |
499 | * Enable InfiniBand management datagram processing, update the cached sm_lid, | |
500 | * lid and gid values, and register a callback function for processing MADs | |
501 | * on the specified port. | |
502 | * | |
503 | * Note: It is safe to call this function more than once for the same port. | |
504 | */ | |
505 | static int srpt_refresh_port(struct srpt_port *sport) | |
506 | { | |
507 | struct ib_mad_reg_req reg_req; | |
508 | struct ib_port_modify port_modify; | |
509 | struct ib_port_attr port_attr; | |
2bce1a6d | 510 | __be16 *guid; |
a42d985b BVA |
511 | int ret; |
512 | ||
9d2aa2b4 | 513 | memset(&port_modify, 0, sizeof(port_modify)); |
a42d985b BVA |
514 | port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; |
515 | port_modify.clr_port_cap_mask = 0; | |
516 | ||
517 | ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
518 | if (ret) | |
519 | goto err_mod_port; | |
520 | ||
521 | ret = ib_query_port(sport->sdev->device, sport->port, &port_attr); | |
522 | if (ret) | |
523 | goto err_query_port; | |
524 | ||
525 | sport->sm_lid = port_attr.sm_lid; | |
526 | sport->lid = port_attr.lid; | |
527 | ||
55ee3ab2 MB |
528 | ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid, |
529 | NULL); | |
a42d985b BVA |
530 | if (ret) |
531 | goto err_query_port; | |
532 | ||
2bce1a6d BVA |
533 | sport->port_guid_wwn.priv = sport; |
534 | guid = (__be16 *)&sport->gid.global.interface_id; | |
716b076b | 535 | snprintf(sport->port_guid, sizeof(sport->port_guid), |
2bce1a6d BVA |
536 | "%04x:%04x:%04x:%04x", |
537 | be16_to_cpu(guid[0]), be16_to_cpu(guid[1]), | |
538 | be16_to_cpu(guid[2]), be16_to_cpu(guid[3])); | |
539 | sport->port_gid_wwn.priv = sport; | |
540 | snprintf(sport->port_gid, sizeof(sport->port_gid), | |
541 | "0x%016llx%016llx", | |
542 | be64_to_cpu(sport->gid.global.subnet_prefix), | |
543 | be64_to_cpu(sport->gid.global.interface_id)); | |
716b076b | 544 | |
a42d985b | 545 | if (!sport->mad_agent) { |
9d2aa2b4 | 546 | memset(®_req, 0, sizeof(reg_req)); |
a42d985b BVA |
547 | reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT; |
548 | reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION; | |
549 | set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask); | |
550 | set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask); | |
551 | ||
552 | sport->mad_agent = ib_register_mad_agent(sport->sdev->device, | |
553 | sport->port, | |
554 | IB_QPT_GSI, | |
555 | ®_req, 0, | |
556 | srpt_mad_send_handler, | |
557 | srpt_mad_recv_handler, | |
0f29b46d | 558 | sport, 0); |
a42d985b BVA |
559 | if (IS_ERR(sport->mad_agent)) { |
560 | ret = PTR_ERR(sport->mad_agent); | |
561 | sport->mad_agent = NULL; | |
562 | goto err_query_port; | |
563 | } | |
564 | } | |
565 | ||
566 | return 0; | |
567 | ||
568 | err_query_port: | |
569 | ||
570 | port_modify.set_port_cap_mask = 0; | |
571 | port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; | |
572 | ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
573 | ||
574 | err_mod_port: | |
575 | ||
576 | return ret; | |
577 | } | |
578 | ||
579 | /** | |
580 | * srpt_unregister_mad_agent() - Unregister MAD callback functions. | |
581 | * | |
582 | * Note: It is safe to call this function more than once for the same device. | |
583 | */ | |
584 | static void srpt_unregister_mad_agent(struct srpt_device *sdev) | |
585 | { | |
586 | struct ib_port_modify port_modify = { | |
587 | .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP, | |
588 | }; | |
589 | struct srpt_port *sport; | |
590 | int i; | |
591 | ||
592 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
593 | sport = &sdev->port[i - 1]; | |
594 | WARN_ON(sport->port != i); | |
595 | if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0) | |
9f5d32af | 596 | pr_err("disabling MAD processing failed.\n"); |
a42d985b BVA |
597 | if (sport->mad_agent) { |
598 | ib_unregister_mad_agent(sport->mad_agent); | |
599 | sport->mad_agent = NULL; | |
600 | } | |
601 | } | |
602 | } | |
603 | ||
604 | /** | |
605 | * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure. | |
606 | */ | |
607 | static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev, | |
608 | int ioctx_size, int dma_size, | |
609 | enum dma_data_direction dir) | |
610 | { | |
611 | struct srpt_ioctx *ioctx; | |
612 | ||
613 | ioctx = kmalloc(ioctx_size, GFP_KERNEL); | |
614 | if (!ioctx) | |
615 | goto err; | |
616 | ||
617 | ioctx->buf = kmalloc(dma_size, GFP_KERNEL); | |
618 | if (!ioctx->buf) | |
619 | goto err_free_ioctx; | |
620 | ||
621 | ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir); | |
622 | if (ib_dma_mapping_error(sdev->device, ioctx->dma)) | |
623 | goto err_free_buf; | |
624 | ||
625 | return ioctx; | |
626 | ||
627 | err_free_buf: | |
628 | kfree(ioctx->buf); | |
629 | err_free_ioctx: | |
630 | kfree(ioctx); | |
631 | err: | |
632 | return NULL; | |
633 | } | |
634 | ||
635 | /** | |
636 | * srpt_free_ioctx() - Free an SRPT I/O context structure. | |
637 | */ | |
638 | static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx, | |
639 | int dma_size, enum dma_data_direction dir) | |
640 | { | |
641 | if (!ioctx) | |
642 | return; | |
643 | ||
644 | ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir); | |
645 | kfree(ioctx->buf); | |
646 | kfree(ioctx); | |
647 | } | |
648 | ||
649 | /** | |
650 | * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures. | |
651 | * @sdev: Device to allocate the I/O context ring for. | |
652 | * @ring_size: Number of elements in the I/O context ring. | |
653 | * @ioctx_size: I/O context size. | |
654 | * @dma_size: DMA buffer size. | |
655 | * @dir: DMA data direction. | |
656 | */ | |
657 | static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev, | |
658 | int ring_size, int ioctx_size, | |
659 | int dma_size, enum dma_data_direction dir) | |
660 | { | |
661 | struct srpt_ioctx **ring; | |
662 | int i; | |
663 | ||
664 | WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) | |
665 | && ioctx_size != sizeof(struct srpt_send_ioctx)); | |
666 | ||
667 | ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL); | |
668 | if (!ring) | |
669 | goto out; | |
670 | for (i = 0; i < ring_size; ++i) { | |
671 | ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir); | |
672 | if (!ring[i]) | |
673 | goto err; | |
674 | ring[i]->index = i; | |
675 | } | |
676 | goto out; | |
677 | ||
678 | err: | |
679 | while (--i >= 0) | |
680 | srpt_free_ioctx(sdev, ring[i], dma_size, dir); | |
681 | kfree(ring); | |
715252d4 | 682 | ring = NULL; |
a42d985b BVA |
683 | out: |
684 | return ring; | |
685 | } | |
686 | ||
687 | /** | |
688 | * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures. | |
689 | */ | |
690 | static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring, | |
691 | struct srpt_device *sdev, int ring_size, | |
692 | int dma_size, enum dma_data_direction dir) | |
693 | { | |
694 | int i; | |
695 | ||
dea26209 BVA |
696 | if (!ioctx_ring) |
697 | return; | |
698 | ||
a42d985b BVA |
699 | for (i = 0; i < ring_size; ++i) |
700 | srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir); | |
701 | kfree(ioctx_ring); | |
702 | } | |
703 | ||
704 | /** | |
705 | * srpt_get_cmd_state() - Get the state of a SCSI command. | |
706 | */ | |
707 | static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx) | |
708 | { | |
709 | enum srpt_command_state state; | |
710 | unsigned long flags; | |
711 | ||
712 | BUG_ON(!ioctx); | |
713 | ||
714 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
715 | state = ioctx->state; | |
716 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
717 | return state; | |
718 | } | |
719 | ||
720 | /** | |
721 | * srpt_set_cmd_state() - Set the state of a SCSI command. | |
722 | * | |
723 | * Does not modify the state of aborted commands. Returns the previous command | |
724 | * state. | |
725 | */ | |
726 | static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
727 | enum srpt_command_state new) | |
728 | { | |
729 | enum srpt_command_state previous; | |
730 | unsigned long flags; | |
731 | ||
732 | BUG_ON(!ioctx); | |
733 | ||
734 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
735 | previous = ioctx->state; | |
736 | if (previous != SRPT_STATE_DONE) | |
737 | ioctx->state = new; | |
738 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
739 | ||
740 | return previous; | |
741 | } | |
742 | ||
743 | /** | |
744 | * srpt_test_and_set_cmd_state() - Test and set the state of a command. | |
745 | * | |
746 | * Returns true if and only if the previous command state was equal to 'old'. | |
747 | */ | |
748 | static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
749 | enum srpt_command_state old, | |
750 | enum srpt_command_state new) | |
751 | { | |
752 | enum srpt_command_state previous; | |
753 | unsigned long flags; | |
754 | ||
755 | WARN_ON(!ioctx); | |
756 | WARN_ON(old == SRPT_STATE_DONE); | |
757 | WARN_ON(new == SRPT_STATE_NEW); | |
758 | ||
759 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
760 | previous = ioctx->state; | |
761 | if (previous == old) | |
762 | ioctx->state = new; | |
763 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
764 | return previous == old; | |
765 | } | |
766 | ||
767 | /** | |
768 | * srpt_post_recv() - Post an IB receive request. | |
769 | */ | |
dea26209 | 770 | static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch, |
a42d985b BVA |
771 | struct srpt_recv_ioctx *ioctx) |
772 | { | |
773 | struct ib_sge list; | |
774 | struct ib_recv_wr wr, *bad_wr; | |
775 | ||
776 | BUG_ON(!sdev); | |
a42d985b BVA |
777 | list.addr = ioctx->ioctx.dma; |
778 | list.length = srp_max_req_size; | |
74333f12 | 779 | list.lkey = sdev->lkey; |
a42d985b | 780 | |
59fae4de CH |
781 | ioctx->ioctx.cqe.done = srpt_recv_done; |
782 | wr.wr_cqe = &ioctx->ioctx.cqe; | |
a42d985b BVA |
783 | wr.next = NULL; |
784 | wr.sg_list = &list; | |
785 | wr.num_sge = 1; | |
786 | ||
dea26209 BVA |
787 | if (sdev->use_srq) |
788 | return ib_post_srq_recv(sdev->srq, &wr, &bad_wr); | |
789 | else | |
790 | return ib_post_recv(ch->qp, &wr, &bad_wr); | |
a42d985b BVA |
791 | } |
792 | ||
aaf45bd8 BVA |
793 | /** |
794 | * srpt_zerolength_write() - Perform a zero-length RDMA write. | |
795 | * | |
796 | * A quote from the InfiniBand specification: C9-88: For an HCA responder | |
797 | * using Reliable Connection service, for each zero-length RDMA READ or WRITE | |
798 | * request, the R_Key shall not be validated, even if the request includes | |
799 | * Immediate data. | |
800 | */ | |
801 | static int srpt_zerolength_write(struct srpt_rdma_ch *ch) | |
802 | { | |
803 | struct ib_send_wr wr, *bad_wr; | |
804 | ||
805 | memset(&wr, 0, sizeof(wr)); | |
806 | wr.opcode = IB_WR_RDMA_WRITE; | |
807 | wr.wr_cqe = &ch->zw_cqe; | |
808 | wr.send_flags = IB_SEND_SIGNALED; | |
809 | return ib_post_send(ch->qp, &wr, &bad_wr); | |
810 | } | |
811 | ||
812 | static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc) | |
813 | { | |
814 | struct srpt_rdma_ch *ch = cq->cq_context; | |
815 | ||
387add46 BVA |
816 | if (wc->status == IB_WC_SUCCESS) { |
817 | srpt_process_wait_list(ch); | |
818 | } else { | |
819 | if (srpt_set_ch_state(ch, CH_DISCONNECTED)) | |
820 | schedule_work(&ch->release_work); | |
821 | else | |
5658600e | 822 | WARN_ONCE(1, "%s-%d\n", ch->sess_name, ch->qp->qp_num); |
387add46 | 823 | } |
aaf45bd8 BVA |
824 | } |
825 | ||
b99f8e4d CH |
826 | static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx, |
827 | struct srp_direct_buf *db, int nbufs, struct scatterlist **sg, | |
828 | unsigned *sg_cnt) | |
829 | { | |
830 | enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd); | |
831 | struct srpt_rdma_ch *ch = ioctx->ch; | |
832 | struct scatterlist *prev = NULL; | |
833 | unsigned prev_nents; | |
834 | int ret, i; | |
835 | ||
836 | if (nbufs == 1) { | |
837 | ioctx->rw_ctxs = &ioctx->s_rw_ctx; | |
838 | } else { | |
839 | ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs), | |
840 | GFP_KERNEL); | |
841 | if (!ioctx->rw_ctxs) | |
842 | return -ENOMEM; | |
843 | } | |
844 | ||
845 | for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) { | |
846 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
847 | u64 remote_addr = be64_to_cpu(db->va); | |
848 | u32 size = be32_to_cpu(db->len); | |
849 | u32 rkey = be32_to_cpu(db->key); | |
850 | ||
851 | ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false, | |
852 | i < nbufs - 1); | |
853 | if (ret) | |
854 | goto unwind; | |
855 | ||
856 | ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port, | |
857 | ctx->sg, ctx->nents, 0, remote_addr, rkey, dir); | |
858 | if (ret < 0) { | |
859 | target_free_sgl(ctx->sg, ctx->nents); | |
860 | goto unwind; | |
861 | } | |
862 | ||
863 | ioctx->n_rdma += ret; | |
864 | ioctx->n_rw_ctx++; | |
865 | ||
866 | if (prev) { | |
867 | sg_unmark_end(&prev[prev_nents - 1]); | |
868 | sg_chain(prev, prev_nents + 1, ctx->sg); | |
869 | } else { | |
870 | *sg = ctx->sg; | |
871 | } | |
872 | ||
873 | prev = ctx->sg; | |
874 | prev_nents = ctx->nents; | |
875 | ||
876 | *sg_cnt += ctx->nents; | |
877 | } | |
878 | ||
879 | return 0; | |
880 | ||
881 | unwind: | |
882 | while (--i >= 0) { | |
883 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
884 | ||
885 | rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port, | |
886 | ctx->sg, ctx->nents, dir); | |
887 | target_free_sgl(ctx->sg, ctx->nents); | |
888 | } | |
889 | if (ioctx->rw_ctxs != &ioctx->s_rw_ctx) | |
890 | kfree(ioctx->rw_ctxs); | |
891 | return ret; | |
892 | } | |
893 | ||
894 | static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch, | |
895 | struct srpt_send_ioctx *ioctx) | |
896 | { | |
897 | enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd); | |
898 | int i; | |
899 | ||
900 | for (i = 0; i < ioctx->n_rw_ctx; i++) { | |
901 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
902 | ||
903 | rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port, | |
904 | ctx->sg, ctx->nents, dir); | |
905 | target_free_sgl(ctx->sg, ctx->nents); | |
906 | } | |
907 | ||
908 | if (ioctx->rw_ctxs != &ioctx->s_rw_ctx) | |
909 | kfree(ioctx->rw_ctxs); | |
910 | } | |
911 | ||
912 | static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd) | |
913 | { | |
914 | /* | |
915 | * The pointer computations below will only be compiled correctly | |
916 | * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check | |
917 | * whether srp_cmd::add_data has been declared as a byte pointer. | |
918 | */ | |
919 | BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) && | |
920 | !__same_type(srp_cmd->add_data[0], (u8)0)); | |
921 | ||
922 | /* | |
923 | * According to the SRP spec, the lower two bits of the 'ADDITIONAL | |
924 | * CDB LENGTH' field are reserved and the size in bytes of this field | |
925 | * is four times the value specified in bits 3..7. Hence the "& ~3". | |
926 | */ | |
927 | return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3); | |
928 | } | |
929 | ||
a42d985b BVA |
930 | /** |
931 | * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request. | |
932 | * @ioctx: Pointer to the I/O context associated with the request. | |
933 | * @srp_cmd: Pointer to the SRP_CMD request data. | |
934 | * @dir: Pointer to the variable to which the transfer direction will be | |
935 | * written. | |
936 | * @data_len: Pointer to the variable to which the total data length of all | |
937 | * descriptors in the SRP_CMD request will be written. | |
938 | * | |
939 | * This function initializes ioctx->nrbuf and ioctx->r_bufs. | |
940 | * | |
941 | * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors; | |
942 | * -ENOMEM when memory allocation fails and zero upon success. | |
943 | */ | |
944 | static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx, | |
b99f8e4d CH |
945 | struct srp_cmd *srp_cmd, enum dma_data_direction *dir, |
946 | struct scatterlist **sg, unsigned *sg_cnt, u64 *data_len) | |
a42d985b | 947 | { |
a42d985b BVA |
948 | BUG_ON(!dir); |
949 | BUG_ON(!data_len); | |
950 | ||
a42d985b BVA |
951 | /* |
952 | * The lower four bits of the buffer format field contain the DATA-IN | |
953 | * buffer descriptor format, and the highest four bits contain the | |
954 | * DATA-OUT buffer descriptor format. | |
955 | */ | |
a42d985b BVA |
956 | if (srp_cmd->buf_fmt & 0xf) |
957 | /* DATA-IN: transfer data from target to initiator (read). */ | |
958 | *dir = DMA_FROM_DEVICE; | |
959 | else if (srp_cmd->buf_fmt >> 4) | |
960 | /* DATA-OUT: transfer data from initiator to target (write). */ | |
961 | *dir = DMA_TO_DEVICE; | |
b99f8e4d CH |
962 | else |
963 | *dir = DMA_NONE; | |
964 | ||
965 | /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */ | |
966 | ioctx->cmd.data_direction = *dir; | |
a42d985b | 967 | |
a42d985b BVA |
968 | if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) || |
969 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) { | |
b99f8e4d | 970 | struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd); |
a42d985b | 971 | |
a42d985b | 972 | *data_len = be32_to_cpu(db->len); |
b99f8e4d | 973 | return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt); |
a42d985b BVA |
974 | } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) || |
975 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) { | |
b99f8e4d CH |
976 | struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd); |
977 | int nbufs = be32_to_cpu(idb->table_desc.len) / | |
978 | sizeof(struct srp_direct_buf); | |
a42d985b | 979 | |
b99f8e4d | 980 | if (nbufs > |
a42d985b | 981 | (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) { |
9f5d32af | 982 | pr_err("received unsupported SRP_CMD request" |
a42d985b BVA |
983 | " type (%u out + %u in != %u / %zu)\n", |
984 | srp_cmd->data_out_desc_cnt, | |
985 | srp_cmd->data_in_desc_cnt, | |
986 | be32_to_cpu(idb->table_desc.len), | |
b99f8e4d CH |
987 | sizeof(struct srp_direct_buf)); |
988 | return -EINVAL; | |
a42d985b BVA |
989 | } |
990 | ||
a42d985b | 991 | *data_len = be32_to_cpu(idb->len); |
b99f8e4d CH |
992 | return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs, |
993 | sg, sg_cnt); | |
994 | } else { | |
995 | *data_len = 0; | |
996 | return 0; | |
a42d985b | 997 | } |
a42d985b BVA |
998 | } |
999 | ||
1000 | /** | |
1001 | * srpt_init_ch_qp() - Initialize queue pair attributes. | |
1002 | * | |
1003 | * Initialized the attributes of queue pair 'qp' by allowing local write, | |
1004 | * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT. | |
1005 | */ | |
1006 | static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1007 | { | |
1008 | struct ib_qp_attr *attr; | |
1009 | int ret; | |
1010 | ||
9d2aa2b4 | 1011 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
a42d985b BVA |
1012 | if (!attr) |
1013 | return -ENOMEM; | |
1014 | ||
1015 | attr->qp_state = IB_QPS_INIT; | |
bec40c26 | 1016 | attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE; |
a42d985b BVA |
1017 | attr->port_num = ch->sport->port; |
1018 | attr->pkey_index = 0; | |
1019 | ||
1020 | ret = ib_modify_qp(qp, attr, | |
1021 | IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT | | |
1022 | IB_QP_PKEY_INDEX); | |
1023 | ||
1024 | kfree(attr); | |
1025 | return ret; | |
1026 | } | |
1027 | ||
1028 | /** | |
1029 | * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR). | |
1030 | * @ch: channel of the queue pair. | |
1031 | * @qp: queue pair to change the state of. | |
1032 | * | |
1033 | * Returns zero upon success and a negative value upon failure. | |
1034 | * | |
1035 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
1036 | * If this structure ever becomes larger, it might be necessary to allocate | |
1037 | * it dynamically instead of on the stack. | |
1038 | */ | |
1039 | static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1040 | { | |
1041 | struct ib_qp_attr qp_attr; | |
1042 | int attr_mask; | |
1043 | int ret; | |
1044 | ||
1045 | qp_attr.qp_state = IB_QPS_RTR; | |
1046 | ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask); | |
1047 | if (ret) | |
1048 | goto out; | |
1049 | ||
1050 | qp_attr.max_dest_rd_atomic = 4; | |
1051 | ||
1052 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
1053 | ||
1054 | out: | |
1055 | return ret; | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS). | |
1060 | * @ch: channel of the queue pair. | |
1061 | * @qp: queue pair to change the state of. | |
1062 | * | |
1063 | * Returns zero upon success and a negative value upon failure. | |
1064 | * | |
1065 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
1066 | * If this structure ever becomes larger, it might be necessary to allocate | |
1067 | * it dynamically instead of on the stack. | |
1068 | */ | |
1069 | static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1070 | { | |
1071 | struct ib_qp_attr qp_attr; | |
1072 | int attr_mask; | |
1073 | int ret; | |
1074 | ||
1075 | qp_attr.qp_state = IB_QPS_RTS; | |
1076 | ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask); | |
1077 | if (ret) | |
1078 | goto out; | |
1079 | ||
1080 | qp_attr.max_rd_atomic = 4; | |
1081 | ||
1082 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
1083 | ||
1084 | out: | |
1085 | return ret; | |
1086 | } | |
1087 | ||
1088 | /** | |
1089 | * srpt_ch_qp_err() - Set the channel queue pair state to 'error'. | |
1090 | */ | |
1091 | static int srpt_ch_qp_err(struct srpt_rdma_ch *ch) | |
1092 | { | |
1093 | struct ib_qp_attr qp_attr; | |
1094 | ||
1095 | qp_attr.qp_state = IB_QPS_ERR; | |
1096 | return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE); | |
1097 | } | |
1098 | ||
a42d985b BVA |
1099 | /** |
1100 | * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator. | |
1101 | */ | |
1102 | static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch) | |
1103 | { | |
1104 | struct srpt_send_ioctx *ioctx; | |
3c968887 | 1105 | unsigned long flags; |
a42d985b BVA |
1106 | |
1107 | BUG_ON(!ch); | |
1108 | ||
3c968887 BVA |
1109 | ioctx = NULL; |
1110 | spin_lock_irqsave(&ch->spinlock, flags); | |
1111 | if (!list_empty(&ch->free_list)) { | |
1112 | ioctx = list_first_entry(&ch->free_list, | |
1113 | struct srpt_send_ioctx, free_list); | |
1114 | list_del(&ioctx->free_list); | |
a42d985b | 1115 | } |
3c968887 BVA |
1116 | spin_unlock_irqrestore(&ch->spinlock, flags); |
1117 | ||
1118 | if (!ioctx) | |
1119 | return ioctx; | |
1120 | ||
1121 | BUG_ON(ioctx->ch != ch); | |
a42d985b BVA |
1122 | spin_lock_init(&ioctx->spinlock); |
1123 | ioctx->state = SRPT_STATE_NEW; | |
3c968887 | 1124 | ioctx->n_rdma = 0; |
b99f8e4d | 1125 | ioctx->n_rw_ctx = 0; |
a42d985b | 1126 | init_completion(&ioctx->tx_done); |
3c968887 BVA |
1127 | ioctx->queue_status_only = false; |
1128 | /* | |
1129 | * transport_init_se_cmd() does not initialize all fields, so do it | |
1130 | * here. | |
1131 | */ | |
1132 | memset(&ioctx->cmd, 0, sizeof(ioctx->cmd)); | |
1133 | memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data)); | |
a42d985b BVA |
1134 | |
1135 | return ioctx; | |
1136 | } | |
1137 | ||
a42d985b BVA |
1138 | /** |
1139 | * srpt_abort_cmd() - Abort a SCSI command. | |
1140 | * @ioctx: I/O context associated with the SCSI command. | |
1141 | * @context: Preferred execution context. | |
1142 | */ | |
1143 | static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx) | |
1144 | { | |
1145 | enum srpt_command_state state; | |
1146 | unsigned long flags; | |
1147 | ||
1148 | BUG_ON(!ioctx); | |
1149 | ||
1150 | /* | |
1151 | * If the command is in a state where the target core is waiting for | |
49f40163 | 1152 | * the ib_srpt driver, change the state to the next state. |
a42d985b BVA |
1153 | */ |
1154 | ||
1155 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
1156 | state = ioctx->state; | |
1157 | switch (state) { | |
1158 | case SRPT_STATE_NEED_DATA: | |
1159 | ioctx->state = SRPT_STATE_DATA_IN; | |
1160 | break; | |
a42d985b BVA |
1161 | case SRPT_STATE_CMD_RSP_SENT: |
1162 | case SRPT_STATE_MGMT_RSP_SENT: | |
1163 | ioctx->state = SRPT_STATE_DONE; | |
1164 | break; | |
1165 | default: | |
49f40163 BVA |
1166 | WARN_ONCE(true, "%s: unexpected I/O context state %d\n", |
1167 | __func__, state); | |
a42d985b BVA |
1168 | break; |
1169 | } | |
1170 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
1171 | ||
13fdd445 BVA |
1172 | pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state, |
1173 | ioctx->state, ioctx->cmd.tag); | |
a42d985b BVA |
1174 | |
1175 | switch (state) { | |
1176 | case SRPT_STATE_NEW: | |
1177 | case SRPT_STATE_DATA_IN: | |
1178 | case SRPT_STATE_MGMT: | |
49f40163 | 1179 | case SRPT_STATE_DONE: |
a42d985b BVA |
1180 | /* |
1181 | * Do nothing - defer abort processing until | |
1182 | * srpt_queue_response() is invoked. | |
1183 | */ | |
a42d985b BVA |
1184 | break; |
1185 | case SRPT_STATE_NEED_DATA: | |
49f40163 BVA |
1186 | pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag); |
1187 | transport_generic_request_failure(&ioctx->cmd, | |
1188 | TCM_CHECK_CONDITION_ABORT_CMD); | |
a42d985b BVA |
1189 | break; |
1190 | case SRPT_STATE_CMD_RSP_SENT: | |
1191 | /* | |
1192 | * SRP_RSP sending failed or the SRP_RSP send completion has | |
1193 | * not been received in time. | |
1194 | */ | |
49f40163 | 1195 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1196 | break; |
1197 | case SRPT_STATE_MGMT_RSP_SENT: | |
49f40163 | 1198 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1199 | break; |
1200 | default: | |
532ec6f1 | 1201 | WARN(1, "Unexpected command state (%d)", state); |
a42d985b BVA |
1202 | break; |
1203 | } | |
1204 | ||
a42d985b BVA |
1205 | return state; |
1206 | } | |
1207 | ||
1208 | /** | |
e672a47f CH |
1209 | * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping |
1210 | * the data that has been transferred via IB RDMA had to be postponed until the | |
142ad5db | 1211 | * check_stop_free() callback. None of this is necessary anymore and needs to |
e672a47f | 1212 | * be cleaned up. |
a42d985b | 1213 | */ |
59fae4de | 1214 | static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1215 | { |
59fae4de CH |
1216 | struct srpt_rdma_ch *ch = cq->cq_context; |
1217 | struct srpt_send_ioctx *ioctx = | |
19f57298 | 1218 | container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe); |
59fae4de | 1219 | |
a42d985b BVA |
1220 | WARN_ON(ioctx->n_rdma <= 0); |
1221 | atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); | |
b99f8e4d | 1222 | ioctx->n_rdma = 0; |
a42d985b | 1223 | |
59fae4de CH |
1224 | if (unlikely(wc->status != IB_WC_SUCCESS)) { |
1225 | pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n", | |
1226 | ioctx, wc->status); | |
1227 | srpt_abort_cmd(ioctx); | |
1228 | return; | |
a42d985b | 1229 | } |
59fae4de CH |
1230 | |
1231 | if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, | |
1232 | SRPT_STATE_DATA_IN)) | |
1233 | target_execute_cmd(&ioctx->cmd); | |
1234 | else | |
1235 | pr_err("%s[%d]: wrong state = %d\n", __func__, | |
1236 | __LINE__, srpt_get_cmd_state(ioctx)); | |
a42d985b BVA |
1237 | } |
1238 | ||
a42d985b BVA |
1239 | /** |
1240 | * srpt_build_cmd_rsp() - Build an SRP_RSP response. | |
1241 | * @ch: RDMA channel through which the request has been received. | |
1242 | * @ioctx: I/O context associated with the SRP_CMD request. The response will | |
1243 | * be built in the buffer ioctx->buf points at and hence this function will | |
1244 | * overwrite the request data. | |
1245 | * @tag: tag of the request for which this response is being generated. | |
1246 | * @status: value for the STATUS field of the SRP_RSP information unit. | |
1247 | * | |
1248 | * Returns the size in bytes of the SRP_RSP response. | |
1249 | * | |
1250 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1251 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1252 | * response. See also SPC-2 for more information about sense data. | |
1253 | */ | |
1254 | static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch, | |
1255 | struct srpt_send_ioctx *ioctx, u64 tag, | |
1256 | int status) | |
1257 | { | |
1258 | struct srp_rsp *srp_rsp; | |
1259 | const u8 *sense_data; | |
1260 | int sense_data_len, max_sense_len; | |
1261 | ||
1262 | /* | |
1263 | * The lowest bit of all SAM-3 status codes is zero (see also | |
1264 | * paragraph 5.3 in SAM-3). | |
1265 | */ | |
1266 | WARN_ON(status & 1); | |
1267 | ||
1268 | srp_rsp = ioctx->ioctx.buf; | |
1269 | BUG_ON(!srp_rsp); | |
1270 | ||
1271 | sense_data = ioctx->sense_data; | |
1272 | sense_data_len = ioctx->cmd.scsi_sense_length; | |
1273 | WARN_ON(sense_data_len > sizeof(ioctx->sense_data)); | |
1274 | ||
9d2aa2b4 | 1275 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1276 | srp_rsp->opcode = SRP_RSP; |
1277 | srp_rsp->req_lim_delta = | |
b356c1c1 | 1278 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); |
a42d985b BVA |
1279 | srp_rsp->tag = tag; |
1280 | srp_rsp->status = status; | |
1281 | ||
1282 | if (sense_data_len) { | |
1283 | BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp)); | |
1284 | max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp); | |
1285 | if (sense_data_len > max_sense_len) { | |
9f5d32af DL |
1286 | pr_warn("truncated sense data from %d to %d" |
1287 | " bytes\n", sense_data_len, max_sense_len); | |
a42d985b BVA |
1288 | sense_data_len = max_sense_len; |
1289 | } | |
1290 | ||
1291 | srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
1292 | srp_rsp->sense_data_len = cpu_to_be32(sense_data_len); | |
1293 | memcpy(srp_rsp + 1, sense_data, sense_data_len); | |
1294 | } | |
1295 | ||
1296 | return sizeof(*srp_rsp) + sense_data_len; | |
1297 | } | |
1298 | ||
1299 | /** | |
1300 | * srpt_build_tskmgmt_rsp() - Build a task management response. | |
1301 | * @ch: RDMA channel through which the request has been received. | |
1302 | * @ioctx: I/O context in which the SRP_RSP response will be built. | |
1303 | * @rsp_code: RSP_CODE that will be stored in the response. | |
1304 | * @tag: Tag of the request for which this response is being generated. | |
1305 | * | |
1306 | * Returns the size in bytes of the SRP_RSP response. | |
1307 | * | |
1308 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1309 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1310 | * response. | |
1311 | */ | |
1312 | static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch, | |
1313 | struct srpt_send_ioctx *ioctx, | |
1314 | u8 rsp_code, u64 tag) | |
1315 | { | |
1316 | struct srp_rsp *srp_rsp; | |
1317 | int resp_data_len; | |
1318 | int resp_len; | |
1319 | ||
c807f643 | 1320 | resp_data_len = 4; |
a42d985b BVA |
1321 | resp_len = sizeof(*srp_rsp) + resp_data_len; |
1322 | ||
1323 | srp_rsp = ioctx->ioctx.buf; | |
1324 | BUG_ON(!srp_rsp); | |
9d2aa2b4 | 1325 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1326 | |
1327 | srp_rsp->opcode = SRP_RSP; | |
b356c1c1 VT |
1328 | srp_rsp->req_lim_delta = |
1329 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); | |
a42d985b BVA |
1330 | srp_rsp->tag = tag; |
1331 | ||
c807f643 JW |
1332 | srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID; |
1333 | srp_rsp->resp_data_len = cpu_to_be32(resp_data_len); | |
1334 | srp_rsp->data[3] = rsp_code; | |
a42d985b BVA |
1335 | |
1336 | return resp_len; | |
1337 | } | |
1338 | ||
a42d985b BVA |
1339 | static int srpt_check_stop_free(struct se_cmd *cmd) |
1340 | { | |
9474b043 NB |
1341 | struct srpt_send_ioctx *ioctx = container_of(cmd, |
1342 | struct srpt_send_ioctx, cmd); | |
a42d985b | 1343 | |
afc16604 | 1344 | return target_put_sess_cmd(&ioctx->cmd); |
a42d985b BVA |
1345 | } |
1346 | ||
1347 | /** | |
1348 | * srpt_handle_cmd() - Process SRP_CMD. | |
1349 | */ | |
2c7f37ff BVA |
1350 | static void srpt_handle_cmd(struct srpt_rdma_ch *ch, |
1351 | struct srpt_recv_ioctx *recv_ioctx, | |
1352 | struct srpt_send_ioctx *send_ioctx) | |
a42d985b BVA |
1353 | { |
1354 | struct se_cmd *cmd; | |
1355 | struct srp_cmd *srp_cmd; | |
b99f8e4d CH |
1356 | struct scatterlist *sg = NULL; |
1357 | unsigned sg_cnt = 0; | |
a42d985b BVA |
1358 | u64 data_len; |
1359 | enum dma_data_direction dir; | |
9474b043 | 1360 | int rc; |
a42d985b BVA |
1361 | |
1362 | BUG_ON(!send_ioctx); | |
1363 | ||
1364 | srp_cmd = recv_ioctx->ioctx.buf; | |
a42d985b | 1365 | cmd = &send_ioctx->cmd; |
649ee054 | 1366 | cmd->tag = srp_cmd->tag; |
a42d985b BVA |
1367 | |
1368 | switch (srp_cmd->task_attr) { | |
1369 | case SRP_CMD_SIMPLE_Q: | |
68d81f40 | 1370 | cmd->sam_task_attr = TCM_SIMPLE_TAG; |
a42d985b BVA |
1371 | break; |
1372 | case SRP_CMD_ORDERED_Q: | |
1373 | default: | |
68d81f40 | 1374 | cmd->sam_task_attr = TCM_ORDERED_TAG; |
a42d985b BVA |
1375 | break; |
1376 | case SRP_CMD_HEAD_OF_Q: | |
68d81f40 | 1377 | cmd->sam_task_attr = TCM_HEAD_TAG; |
a42d985b BVA |
1378 | break; |
1379 | case SRP_CMD_ACA: | |
68d81f40 | 1380 | cmd->sam_task_attr = TCM_ACA_TAG; |
a42d985b BVA |
1381 | break; |
1382 | } | |
1383 | ||
b99f8e4d CH |
1384 | rc = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &sg, &sg_cnt, |
1385 | &data_len); | |
1386 | if (rc) { | |
1387 | if (rc != -EAGAIN) { | |
1388 | pr_err("0x%llx: parsing SRP descriptor table failed.\n", | |
1389 | srp_cmd->tag); | |
1390 | } | |
2c7f37ff | 1391 | goto release_ioctx; |
a42d985b BVA |
1392 | } |
1393 | ||
b99f8e4d | 1394 | rc = target_submit_cmd_map_sgls(cmd, ch->sess, srp_cmd->cdb, |
e1dd413c BVA |
1395 | &send_ioctx->sense_data[0], |
1396 | scsilun_to_int(&srp_cmd->lun), data_len, | |
b99f8e4d CH |
1397 | TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF, |
1398 | sg, sg_cnt, NULL, 0, NULL, 0); | |
9474b043 | 1399 | if (rc != 0) { |
2c7f37ff BVA |
1400 | pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc, |
1401 | srp_cmd->tag); | |
1402 | goto release_ioctx; | |
187e70a5 | 1403 | } |
2c7f37ff | 1404 | return; |
a42d985b | 1405 | |
2c7f37ff BVA |
1406 | release_ioctx: |
1407 | send_ioctx->state = SRPT_STATE_DONE; | |
1408 | srpt_release_cmd(cmd); | |
a42d985b BVA |
1409 | } |
1410 | ||
a42d985b BVA |
1411 | static int srp_tmr_to_tcm(int fn) |
1412 | { | |
1413 | switch (fn) { | |
1414 | case SRP_TSK_ABORT_TASK: | |
1415 | return TMR_ABORT_TASK; | |
1416 | case SRP_TSK_ABORT_TASK_SET: | |
1417 | return TMR_ABORT_TASK_SET; | |
1418 | case SRP_TSK_CLEAR_TASK_SET: | |
1419 | return TMR_CLEAR_TASK_SET; | |
1420 | case SRP_TSK_LUN_RESET: | |
1421 | return TMR_LUN_RESET; | |
1422 | case SRP_TSK_CLEAR_ACA: | |
1423 | return TMR_CLEAR_ACA; | |
1424 | default: | |
1425 | return -1; | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | /** | |
1430 | * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit. | |
1431 | * | |
1432 | * Returns 0 if and only if the request will be processed by the target core. | |
1433 | * | |
1434 | * For more information about SRP_TSK_MGMT information units, see also section | |
1435 | * 6.7 in the SRP r16a document. | |
1436 | */ | |
1437 | static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch, | |
1438 | struct srpt_recv_ioctx *recv_ioctx, | |
1439 | struct srpt_send_ioctx *send_ioctx) | |
1440 | { | |
1441 | struct srp_tsk_mgmt *srp_tsk; | |
1442 | struct se_cmd *cmd; | |
3e4f5748 | 1443 | struct se_session *sess = ch->sess; |
a42d985b | 1444 | int tcm_tmr; |
3e4f5748 | 1445 | int rc; |
a42d985b BVA |
1446 | |
1447 | BUG_ON(!send_ioctx); | |
1448 | ||
1449 | srp_tsk = recv_ioctx->ioctx.buf; | |
1450 | cmd = &send_ioctx->cmd; | |
1451 | ||
1452 | pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld" | |
1453 | " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func, | |
1454 | srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess); | |
1455 | ||
1456 | srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT); | |
649ee054 | 1457 | send_ioctx->cmd.tag = srp_tsk->tag; |
a42d985b | 1458 | tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func); |
e1dd413c BVA |
1459 | rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, |
1460 | scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr, | |
1461 | GFP_KERNEL, srp_tsk->task_tag, | |
1462 | TARGET_SCF_ACK_KREF); | |
3e4f5748 NB |
1463 | if (rc != 0) { |
1464 | send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED; | |
de103c93 | 1465 | goto fail; |
a42d985b | 1466 | } |
de103c93 CH |
1467 | return; |
1468 | fail: | |
de103c93 | 1469 | transport_send_check_condition_and_sense(cmd, 0, 0); // XXX: |
a42d985b BVA |
1470 | } |
1471 | ||
1472 | /** | |
1473 | * srpt_handle_new_iu() - Process a newly received information unit. | |
1474 | * @ch: RDMA channel through which the information unit has been received. | |
1475 | * @ioctx: SRPT I/O context associated with the information unit. | |
1476 | */ | |
1477 | static void srpt_handle_new_iu(struct srpt_rdma_ch *ch, | |
1478 | struct srpt_recv_ioctx *recv_ioctx, | |
1479 | struct srpt_send_ioctx *send_ioctx) | |
1480 | { | |
1481 | struct srp_cmd *srp_cmd; | |
a42d985b BVA |
1482 | |
1483 | BUG_ON(!ch); | |
1484 | BUG_ON(!recv_ioctx); | |
1485 | ||
1486 | ib_dma_sync_single_for_cpu(ch->sport->sdev->device, | |
1487 | recv_ioctx->ioctx.dma, srp_max_req_size, | |
1488 | DMA_FROM_DEVICE); | |
1489 | ||
b99f8e4d CH |
1490 | if (unlikely(ch->state == CH_CONNECTING)) |
1491 | goto out_wait; | |
a42d985b | 1492 | |
33912d73 | 1493 | if (unlikely(ch->state != CH_LIVE)) |
b99f8e4d | 1494 | return; |
a42d985b BVA |
1495 | |
1496 | srp_cmd = recv_ioctx->ioctx.buf; | |
1497 | if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) { | |
b99f8e4d CH |
1498 | if (!send_ioctx) { |
1499 | if (!list_empty(&ch->cmd_wait_list)) | |
1500 | goto out_wait; | |
a42d985b | 1501 | send_ioctx = srpt_get_send_ioctx(ch); |
a42d985b | 1502 | } |
b99f8e4d CH |
1503 | if (unlikely(!send_ioctx)) |
1504 | goto out_wait; | |
a42d985b BVA |
1505 | } |
1506 | ||
a42d985b BVA |
1507 | switch (srp_cmd->opcode) { |
1508 | case SRP_CMD: | |
1509 | srpt_handle_cmd(ch, recv_ioctx, send_ioctx); | |
1510 | break; | |
1511 | case SRP_TSK_MGMT: | |
1512 | srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx); | |
1513 | break; | |
1514 | case SRP_I_LOGOUT: | |
9f5d32af | 1515 | pr_err("Not yet implemented: SRP_I_LOGOUT\n"); |
a42d985b BVA |
1516 | break; |
1517 | case SRP_CRED_RSP: | |
1518 | pr_debug("received SRP_CRED_RSP\n"); | |
1519 | break; | |
1520 | case SRP_AER_RSP: | |
1521 | pr_debug("received SRP_AER_RSP\n"); | |
1522 | break; | |
1523 | case SRP_RSP: | |
9f5d32af | 1524 | pr_err("Received SRP_RSP\n"); |
a42d985b BVA |
1525 | break; |
1526 | default: | |
9f5d32af | 1527 | pr_err("received IU with unknown opcode 0x%x\n", |
a42d985b BVA |
1528 | srp_cmd->opcode); |
1529 | break; | |
1530 | } | |
1531 | ||
dea26209 | 1532 | srpt_post_recv(ch->sport->sdev, ch, recv_ioctx); |
a42d985b | 1533 | return; |
b99f8e4d CH |
1534 | |
1535 | out_wait: | |
1536 | list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list); | |
a42d985b BVA |
1537 | } |
1538 | ||
59fae4de | 1539 | static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1540 | { |
59fae4de CH |
1541 | struct srpt_rdma_ch *ch = cq->cq_context; |
1542 | struct srpt_recv_ioctx *ioctx = | |
1543 | container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe); | |
a42d985b | 1544 | |
a42d985b BVA |
1545 | if (wc->status == IB_WC_SUCCESS) { |
1546 | int req_lim; | |
1547 | ||
1548 | req_lim = atomic_dec_return(&ch->req_lim); | |
1549 | if (unlikely(req_lim < 0)) | |
9f5d32af | 1550 | pr_err("req_lim = %d < 0\n", req_lim); |
a42d985b BVA |
1551 | srpt_handle_new_iu(ch, ioctx, NULL); |
1552 | } else { | |
59fae4de CH |
1553 | pr_info("receiving failed for ioctx %p with status %d\n", |
1554 | ioctx, wc->status); | |
a42d985b BVA |
1555 | } |
1556 | } | |
1557 | ||
539b3248 BVA |
1558 | /* |
1559 | * This function must be called from the context in which RDMA completions are | |
1560 | * processed because it accesses the wait list without protection against | |
1561 | * access from other threads. | |
1562 | */ | |
1563 | static void srpt_process_wait_list(struct srpt_rdma_ch *ch) | |
1564 | { | |
1565 | struct srpt_send_ioctx *ioctx; | |
1566 | ||
1567 | while (!list_empty(&ch->cmd_wait_list) && | |
1568 | ch->state >= CH_LIVE && | |
1569 | (ioctx = srpt_get_send_ioctx(ch)) != NULL) { | |
1570 | struct srpt_recv_ioctx *recv_ioctx; | |
1571 | ||
1572 | recv_ioctx = list_first_entry(&ch->cmd_wait_list, | |
1573 | struct srpt_recv_ioctx, | |
1574 | wait_list); | |
1575 | list_del(&recv_ioctx->wait_list); | |
1576 | srpt_handle_new_iu(ch, recv_ioctx, ioctx); | |
1577 | } | |
1578 | } | |
1579 | ||
a42d985b | 1580 | /** |
a42d985b BVA |
1581 | * Note: Although this has not yet been observed during tests, at least in |
1582 | * theory it is possible that the srpt_get_send_ioctx() call invoked by | |
1583 | * srpt_handle_new_iu() fails. This is possible because the req_lim_delta | |
1584 | * value in each response is set to one, and it is possible that this response | |
1585 | * makes the initiator send a new request before the send completion for that | |
1586 | * response has been processed. This could e.g. happen if the call to | |
1587 | * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or | |
1588 | * if IB retransmission causes generation of the send completion to be | |
1589 | * delayed. Incoming information units for which srpt_get_send_ioctx() fails | |
1590 | * are queued on cmd_wait_list. The code below processes these delayed | |
1591 | * requests one at a time. | |
1592 | */ | |
59fae4de | 1593 | static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1594 | { |
59fae4de CH |
1595 | struct srpt_rdma_ch *ch = cq->cq_context; |
1596 | struct srpt_send_ioctx *ioctx = | |
1597 | container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe); | |
1598 | enum srpt_command_state state; | |
a42d985b | 1599 | |
59fae4de CH |
1600 | state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); |
1601 | ||
1602 | WARN_ON(state != SRPT_STATE_CMD_RSP_SENT && | |
1603 | state != SRPT_STATE_MGMT_RSP_SENT); | |
1604 | ||
b99f8e4d | 1605 | atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail); |
59fae4de | 1606 | |
49f40163 | 1607 | if (wc->status != IB_WC_SUCCESS) |
59fae4de CH |
1608 | pr_info("sending response for ioctx 0x%p failed" |
1609 | " with status %d\n", ioctx, wc->status); | |
1610 | ||
59fae4de | 1611 | if (state != SRPT_STATE_DONE) { |
59fae4de | 1612 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b | 1613 | } else { |
59fae4de CH |
1614 | pr_err("IB completion has been received too late for" |
1615 | " wr_id = %u.\n", ioctx->ioctx.index); | |
a42d985b BVA |
1616 | } |
1617 | ||
539b3248 | 1618 | srpt_process_wait_list(ch); |
a42d985b BVA |
1619 | } |
1620 | ||
a42d985b BVA |
1621 | /** |
1622 | * srpt_create_ch_ib() - Create receive and send completion queues. | |
1623 | */ | |
1624 | static int srpt_create_ch_ib(struct srpt_rdma_ch *ch) | |
1625 | { | |
1626 | struct ib_qp_init_attr *qp_init; | |
1627 | struct srpt_port *sport = ch->sport; | |
1628 | struct srpt_device *sdev = sport->sdev; | |
30c6d877 | 1629 | const struct ib_device_attr *attrs = &sdev->device->attrs; |
a42d985b | 1630 | u32 srp_sq_size = sport->port_attrib.srp_sq_size; |
dea26209 | 1631 | int i, ret; |
a42d985b BVA |
1632 | |
1633 | WARN_ON(ch->rq_size < 1); | |
1634 | ||
1635 | ret = -ENOMEM; | |
9d2aa2b4 | 1636 | qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL); |
a42d985b BVA |
1637 | if (!qp_init) |
1638 | goto out; | |
1639 | ||
ab477c1f | 1640 | retry: |
59fae4de CH |
1641 | ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + srp_sq_size, |
1642 | 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE); | |
a42d985b BVA |
1643 | if (IS_ERR(ch->cq)) { |
1644 | ret = PTR_ERR(ch->cq); | |
9f5d32af | 1645 | pr_err("failed to create CQ cqe= %d ret= %d\n", |
a42d985b BVA |
1646 | ch->rq_size + srp_sq_size, ret); |
1647 | goto out; | |
1648 | } | |
1649 | ||
1650 | qp_init->qp_context = (void *)ch; | |
1651 | qp_init->event_handler | |
1652 | = (void(*)(struct ib_event *, void*))srpt_qp_event; | |
1653 | qp_init->send_cq = ch->cq; | |
1654 | qp_init->recv_cq = ch->cq; | |
a42d985b BVA |
1655 | qp_init->sq_sig_type = IB_SIGNAL_REQ_WR; |
1656 | qp_init->qp_type = IB_QPT_RC; | |
b99f8e4d CH |
1657 | /* |
1658 | * We divide up our send queue size into half SEND WRs to send the | |
1659 | * completions, and half R/W contexts to actually do the RDMA | |
1660 | * READ/WRITE transfers. Note that we need to allocate CQ slots for | |
1661 | * both both, as RDMA contexts will also post completions for the | |
1662 | * RDMA READ case. | |
1663 | */ | |
7a01d05c | 1664 | qp_init->cap.max_send_wr = min(srp_sq_size / 2, attrs->max_qp_wr + 0U); |
b99f8e4d | 1665 | qp_init->cap.max_rdma_ctxs = srp_sq_size / 2; |
30c6d877 | 1666 | qp_init->cap.max_send_sge = min(attrs->max_sge, SRPT_MAX_SG_PER_WQE); |
b99f8e4d | 1667 | qp_init->port_num = ch->sport->port; |
dea26209 BVA |
1668 | if (sdev->use_srq) { |
1669 | qp_init->srq = sdev->srq; | |
1670 | } else { | |
1671 | qp_init->cap.max_recv_wr = ch->rq_size; | |
1672 | qp_init->cap.max_recv_sge = qp_init->cap.max_send_sge; | |
1673 | } | |
a42d985b BVA |
1674 | |
1675 | ch->qp = ib_create_qp(sdev->pd, qp_init); | |
1676 | if (IS_ERR(ch->qp)) { | |
1677 | ret = PTR_ERR(ch->qp); | |
ab477c1f BVA |
1678 | if (ret == -ENOMEM) { |
1679 | srp_sq_size /= 2; | |
1680 | if (srp_sq_size >= MIN_SRPT_SQ_SIZE) { | |
1681 | ib_destroy_cq(ch->cq); | |
1682 | goto retry; | |
1683 | } | |
1684 | } | |
9f5d32af | 1685 | pr_err("failed to create_qp ret= %d\n", ret); |
a42d985b BVA |
1686 | goto err_destroy_cq; |
1687 | } | |
1688 | ||
1689 | atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr); | |
1690 | ||
1691 | pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n", | |
1692 | __func__, ch->cq->cqe, qp_init->cap.max_send_sge, | |
1693 | qp_init->cap.max_send_wr, ch->cm_id); | |
1694 | ||
1695 | ret = srpt_init_ch_qp(ch, ch->qp); | |
1696 | if (ret) | |
1697 | goto err_destroy_qp; | |
1698 | ||
321e329b MM |
1699 | if (!sdev->use_srq) |
1700 | for (i = 0; i < ch->rq_size; i++) | |
1701 | srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]); | |
1702 | ||
a42d985b BVA |
1703 | out: |
1704 | kfree(qp_init); | |
1705 | return ret; | |
1706 | ||
1707 | err_destroy_qp: | |
1708 | ib_destroy_qp(ch->qp); | |
1709 | err_destroy_cq: | |
59fae4de | 1710 | ib_free_cq(ch->cq); |
a42d985b BVA |
1711 | goto out; |
1712 | } | |
1713 | ||
1714 | static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch) | |
1715 | { | |
a42d985b | 1716 | ib_destroy_qp(ch->qp); |
59fae4de | 1717 | ib_free_cq(ch->cq); |
a42d985b BVA |
1718 | } |
1719 | ||
1720 | /** | |
aaf45bd8 | 1721 | * srpt_close_ch() - Close an RDMA channel. |
a42d985b | 1722 | * |
aaf45bd8 BVA |
1723 | * Make sure all resources associated with the channel will be deallocated at |
1724 | * an appropriate time. | |
a42d985b | 1725 | * |
aaf45bd8 BVA |
1726 | * Returns true if and only if the channel state has been modified into |
1727 | * CH_DRAINING. | |
a42d985b | 1728 | */ |
aaf45bd8 | 1729 | static bool srpt_close_ch(struct srpt_rdma_ch *ch) |
a42d985b | 1730 | { |
aaf45bd8 | 1731 | int ret; |
a42d985b | 1732 | |
aaf45bd8 BVA |
1733 | if (!srpt_set_ch_state(ch, CH_DRAINING)) { |
1734 | pr_debug("%s-%d: already closed\n", ch->sess_name, | |
1735 | ch->qp->qp_num); | |
1736 | return false; | |
a42d985b | 1737 | } |
a42d985b | 1738 | |
aaf45bd8 | 1739 | kref_get(&ch->kref); |
a42d985b | 1740 | |
aaf45bd8 BVA |
1741 | ret = srpt_ch_qp_err(ch); |
1742 | if (ret < 0) | |
1743 | pr_err("%s-%d: changing queue pair into error state failed: %d\n", | |
1744 | ch->sess_name, ch->qp->qp_num, ret); | |
a42d985b | 1745 | |
aaf45bd8 BVA |
1746 | pr_debug("%s-%d: queued zerolength write\n", ch->sess_name, |
1747 | ch->qp->qp_num); | |
1748 | ret = srpt_zerolength_write(ch); | |
1749 | if (ret < 0) { | |
1750 | pr_err("%s-%d: queuing zero-length write failed: %d\n", | |
1751 | ch->sess_name, ch->qp->qp_num, ret); | |
1752 | if (srpt_set_ch_state(ch, CH_DISCONNECTED)) | |
1753 | schedule_work(&ch->release_work); | |
1754 | else | |
1755 | WARN_ON_ONCE(true); | |
1756 | } | |
a42d985b | 1757 | |
aaf45bd8 BVA |
1758 | kref_put(&ch->kref, srpt_free_ch); |
1759 | ||
1760 | return true; | |
1d19f780 NB |
1761 | } |
1762 | ||
aaf45bd8 BVA |
1763 | /* |
1764 | * Change the channel state into CH_DISCONNECTING. If a channel has not yet | |
1765 | * reached the connected state, close it. If a channel is in the connected | |
1766 | * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is | |
1767 | * the responsibility of the caller to ensure that this function is not | |
1768 | * invoked concurrently with the code that accepts a connection. This means | |
1769 | * that this function must either be invoked from inside a CM callback | |
1770 | * function or that it must be invoked with the srpt_port.mutex held. | |
a42d985b | 1771 | */ |
aaf45bd8 | 1772 | static int srpt_disconnect_ch(struct srpt_rdma_ch *ch) |
a42d985b | 1773 | { |
a42d985b | 1774 | int ret; |
a42d985b | 1775 | |
aaf45bd8 BVA |
1776 | if (!srpt_set_ch_state(ch, CH_DISCONNECTING)) |
1777 | return -ENOTCONN; | |
a42d985b | 1778 | |
aaf45bd8 BVA |
1779 | ret = ib_send_cm_dreq(ch->cm_id, NULL, 0); |
1780 | if (ret < 0) | |
1781 | ret = ib_send_cm_drep(ch->cm_id, NULL, 0); | |
a42d985b | 1782 | |
aaf45bd8 BVA |
1783 | if (ret < 0 && srpt_close_ch(ch)) |
1784 | ret = 0; | |
1d19f780 | 1785 | |
aaf45bd8 BVA |
1786 | return ret; |
1787 | } | |
1788 | ||
01b3ee13 BVA |
1789 | /* |
1790 | * Send DREQ and wait for DREP. Return true if and only if this function | |
1791 | * changed the state of @ch. | |
1792 | */ | |
1793 | static bool srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch) | |
1794 | __must_hold(&sdev->mutex) | |
aaf45bd8 | 1795 | { |
01b3ee13 BVA |
1796 | DECLARE_COMPLETION_ONSTACK(release_done); |
1797 | struct srpt_device *sdev = ch->sport->sdev; | |
1798 | bool wait; | |
1799 | ||
1800 | lockdep_assert_held(&sdev->mutex); | |
1801 | ||
1802 | pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num, | |
1803 | ch->state); | |
1804 | ||
1805 | WARN_ON(ch->release_done); | |
1806 | ch->release_done = &release_done; | |
1807 | wait = !list_empty(&ch->list); | |
1808 | srpt_disconnect_ch(ch); | |
1809 | mutex_unlock(&sdev->mutex); | |
1810 | ||
1811 | if (!wait) | |
1812 | goto out; | |
1813 | ||
1814 | while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0) | |
1815 | pr_info("%s(%s-%d state %d): still waiting ...\n", __func__, | |
1816 | ch->sess_name, ch->qp->qp_num, ch->state); | |
1817 | ||
1818 | out: | |
1819 | mutex_lock(&sdev->mutex); | |
1820 | return wait; | |
1821 | } | |
1822 | ||
8b6dc529 BVA |
1823 | static void srpt_set_enabled(struct srpt_port *sport, bool enabled) |
1824 | __must_hold(&sdev->mutex) | |
aaf45bd8 | 1825 | { |
8b6dc529 | 1826 | struct srpt_device *sdev = sport->sdev; |
aaf45bd8 BVA |
1827 | struct srpt_rdma_ch *ch; |
1828 | ||
1829 | lockdep_assert_held(&sdev->mutex); | |
1830 | ||
8b6dc529 BVA |
1831 | if (sport->enabled == enabled) |
1832 | return; | |
1833 | sport->enabled = enabled; | |
1834 | if (sport->enabled) | |
1835 | return; | |
1836 | ||
1837 | again: | |
aaf45bd8 | 1838 | list_for_each_entry(ch, &sdev->rch_list, list) { |
8b6dc529 BVA |
1839 | if (ch->sport == sport) { |
1840 | pr_info("%s: closing channel %s-%d\n", | |
1841 | sdev->device->name, ch->sess_name, | |
1842 | ch->qp->qp_num); | |
1843 | if (srpt_disconnect_ch_sync(ch)) | |
1844 | goto again; | |
1845 | } | |
a42d985b | 1846 | } |
8b6dc529 | 1847 | |
a42d985b BVA |
1848 | } |
1849 | ||
aaf45bd8 BVA |
1850 | static void srpt_free_ch(struct kref *kref) |
1851 | { | |
1852 | struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref); | |
1853 | ||
1854 | kfree(ch); | |
a42d985b BVA |
1855 | } |
1856 | ||
1857 | static void srpt_release_channel_work(struct work_struct *w) | |
1858 | { | |
1859 | struct srpt_rdma_ch *ch; | |
1860 | struct srpt_device *sdev; | |
9474b043 | 1861 | struct se_session *se_sess; |
a42d985b BVA |
1862 | |
1863 | ch = container_of(w, struct srpt_rdma_ch, release_work); | |
f108f0f6 BVA |
1864 | pr_debug("%s: %s-%d; release_done = %p\n", __func__, ch->sess_name, |
1865 | ch->qp->qp_num, ch->release_done); | |
a42d985b BVA |
1866 | |
1867 | sdev = ch->sport->sdev; | |
1868 | BUG_ON(!sdev); | |
1869 | ||
9474b043 NB |
1870 | se_sess = ch->sess; |
1871 | BUG_ON(!se_sess); | |
1872 | ||
88936259 | 1873 | target_sess_cmd_list_set_waiting(se_sess); |
be646c2d | 1874 | target_wait_for_sess_cmds(se_sess); |
9474b043 NB |
1875 | |
1876 | transport_deregister_session_configfs(se_sess); | |
1877 | transport_deregister_session(se_sess); | |
a42d985b BVA |
1878 | ch->sess = NULL; |
1879 | ||
0b41d6ca NB |
1880 | ib_destroy_cm_id(ch->cm_id); |
1881 | ||
a42d985b BVA |
1882 | srpt_destroy_ch_ib(ch); |
1883 | ||
1884 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
1885 | ch->sport->sdev, ch->rq_size, | |
1886 | ch->rsp_size, DMA_TO_DEVICE); | |
1887 | ||
dea26209 BVA |
1888 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, |
1889 | sdev, ch->rq_size, | |
1890 | srp_max_req_size, DMA_FROM_DEVICE); | |
1891 | ||
8628991f | 1892 | mutex_lock(&sdev->mutex); |
f108f0f6 | 1893 | list_del_init(&ch->list); |
a42d985b BVA |
1894 | if (ch->release_done) |
1895 | complete(ch->release_done); | |
8628991f | 1896 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
1897 | |
1898 | wake_up(&sdev->ch_releaseQ); | |
1899 | ||
aaf45bd8 | 1900 | kref_put(&ch->kref, srpt_free_ch); |
a42d985b BVA |
1901 | } |
1902 | ||
a42d985b BVA |
1903 | /** |
1904 | * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED. | |
1905 | * | |
1906 | * Ownership of the cm_id is transferred to the target session if this | |
1907 | * functions returns zero. Otherwise the caller remains the owner of cm_id. | |
1908 | */ | |
1909 | static int srpt_cm_req_recv(struct ib_cm_id *cm_id, | |
1910 | struct ib_cm_req_event_param *param, | |
1911 | void *private_data) | |
1912 | { | |
1913 | struct srpt_device *sdev = cm_id->context; | |
1914 | struct srpt_port *sport = &sdev->port[param->port - 1]; | |
1915 | struct srp_login_req *req; | |
1916 | struct srp_login_rsp *rsp; | |
1917 | struct srp_login_rej *rej; | |
1918 | struct ib_cm_rep_param *rep_param; | |
1919 | struct srpt_rdma_ch *ch, *tmp_ch; | |
2bce1a6d | 1920 | __be16 *guid; |
a42d985b | 1921 | u32 it_iu_len; |
3c968887 | 1922 | int i, ret = 0; |
a42d985b BVA |
1923 | |
1924 | WARN_ON_ONCE(irqs_disabled()); | |
1925 | ||
1926 | if (WARN_ON(!sdev || !private_data)) | |
1927 | return -EINVAL; | |
1928 | ||
1929 | req = (struct srp_login_req *)private_data; | |
1930 | ||
1931 | it_iu_len = be32_to_cpu(req->req_it_iu_len); | |
1932 | ||
9f5d32af DL |
1933 | pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx," |
1934 | " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d" | |
1935 | " (guid=0x%llx:0x%llx)\n", | |
1936 | be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]), | |
1937 | be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]), | |
1938 | be64_to_cpu(*(__be64 *)&req->target_port_id[0]), | |
1939 | be64_to_cpu(*(__be64 *)&req->target_port_id[8]), | |
1940 | it_iu_len, | |
1941 | param->port, | |
1942 | be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]), | |
1943 | be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8])); | |
a42d985b | 1944 | |
9d2aa2b4 BVA |
1945 | rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); |
1946 | rej = kzalloc(sizeof(*rej), GFP_KERNEL); | |
1947 | rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL); | |
a42d985b BVA |
1948 | |
1949 | if (!rsp || !rej || !rep_param) { | |
1950 | ret = -ENOMEM; | |
1951 | goto out; | |
1952 | } | |
1953 | ||
1954 | if (it_iu_len > srp_max_req_size || it_iu_len < 64) { | |
b356c1c1 VT |
1955 | rej->reason = cpu_to_be32( |
1956 | SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE); | |
a42d985b | 1957 | ret = -EINVAL; |
9f5d32af | 1958 | pr_err("rejected SRP_LOGIN_REQ because its" |
a42d985b BVA |
1959 | " length (%d bytes) is out of range (%d .. %d)\n", |
1960 | it_iu_len, 64, srp_max_req_size); | |
1961 | goto reject; | |
1962 | } | |
1963 | ||
1964 | if (!sport->enabled) { | |
b356c1c1 VT |
1965 | rej->reason = cpu_to_be32( |
1966 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
a42d985b | 1967 | ret = -EINVAL; |
9f5d32af | 1968 | pr_err("rejected SRP_LOGIN_REQ because the target port" |
a42d985b BVA |
1969 | " has not yet been enabled\n"); |
1970 | goto reject; | |
1971 | } | |
1972 | ||
1973 | if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) { | |
1974 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN; | |
1975 | ||
8628991f | 1976 | mutex_lock(&sdev->mutex); |
a42d985b BVA |
1977 | |
1978 | list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) { | |
1979 | if (!memcmp(ch->i_port_id, req->initiator_port_id, 16) | |
1980 | && !memcmp(ch->t_port_id, req->target_port_id, 16) | |
1981 | && param->port == ch->sport->port | |
1982 | && param->listen_id == ch->sport->sdev->cm_id | |
1983 | && ch->cm_id) { | |
aaf45bd8 | 1984 | if (srpt_disconnect_ch(ch) < 0) |
a42d985b | 1985 | continue; |
aaf45bd8 BVA |
1986 | pr_info("Relogin - closed existing channel %s\n", |
1987 | ch->sess_name); | |
a42d985b BVA |
1988 | rsp->rsp_flags = |
1989 | SRP_LOGIN_RSP_MULTICHAN_TERMINATED; | |
1990 | } | |
1991 | } | |
1992 | ||
8628991f | 1993 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
1994 | |
1995 | } else | |
1996 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED; | |
1997 | ||
1998 | if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid) | |
1999 | || *(__be64 *)(req->target_port_id + 8) != | |
2000 | cpu_to_be64(srpt_service_guid)) { | |
b356c1c1 VT |
2001 | rej->reason = cpu_to_be32( |
2002 | SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL); | |
a42d985b | 2003 | ret = -ENOMEM; |
9f5d32af | 2004 | pr_err("rejected SRP_LOGIN_REQ because it" |
a42d985b BVA |
2005 | " has an invalid target port identifier.\n"); |
2006 | goto reject; | |
2007 | } | |
2008 | ||
9d2aa2b4 | 2009 | ch = kzalloc(sizeof(*ch), GFP_KERNEL); |
a42d985b | 2010 | if (!ch) { |
b356c1c1 VT |
2011 | rej->reason = cpu_to_be32( |
2012 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
9f5d32af | 2013 | pr_err("rejected SRP_LOGIN_REQ because no memory.\n"); |
a42d985b BVA |
2014 | ret = -ENOMEM; |
2015 | goto reject; | |
2016 | } | |
2017 | ||
aaf45bd8 BVA |
2018 | kref_init(&ch->kref); |
2019 | ch->zw_cqe.done = srpt_zerolength_write_done; | |
a42d985b BVA |
2020 | INIT_WORK(&ch->release_work, srpt_release_channel_work); |
2021 | memcpy(ch->i_port_id, req->initiator_port_id, 16); | |
2022 | memcpy(ch->t_port_id, req->target_port_id, 16); | |
2023 | ch->sport = &sdev->port[param->port - 1]; | |
2024 | ch->cm_id = cm_id; | |
2739b592 | 2025 | cm_id->context = ch; |
a42d985b | 2026 | /* |
7a01d05c BVA |
2027 | * ch->rq_size should be at least as large as the initiator queue |
2028 | * depth to avoid that the initiator driver has to report QUEUE_FULL | |
2029 | * to the SCSI mid-layer. | |
a42d985b | 2030 | */ |
7a01d05c | 2031 | ch->rq_size = min(SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr); |
a42d985b BVA |
2032 | spin_lock_init(&ch->spinlock); |
2033 | ch->state = CH_CONNECTING; | |
2034 | INIT_LIST_HEAD(&ch->cmd_wait_list); | |
2035 | ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size; | |
2036 | ||
2037 | ch->ioctx_ring = (struct srpt_send_ioctx **) | |
2038 | srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, | |
2039 | sizeof(*ch->ioctx_ring[0]), | |
2040 | ch->rsp_size, DMA_TO_DEVICE); | |
2041 | if (!ch->ioctx_ring) | |
2042 | goto free_ch; | |
2043 | ||
3c968887 BVA |
2044 | INIT_LIST_HEAD(&ch->free_list); |
2045 | for (i = 0; i < ch->rq_size; i++) { | |
2046 | ch->ioctx_ring[i]->ch = ch; | |
2047 | list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list); | |
2048 | } | |
dea26209 BVA |
2049 | if (!sdev->use_srq) { |
2050 | ch->ioctx_recv_ring = (struct srpt_recv_ioctx **) | |
2051 | srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, | |
2052 | sizeof(*ch->ioctx_recv_ring[0]), | |
2053 | srp_max_req_size, | |
2054 | DMA_FROM_DEVICE); | |
2055 | if (!ch->ioctx_recv_ring) { | |
2056 | pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n"); | |
2057 | rej->reason = | |
2058 | cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
2059 | goto free_ring; | |
2060 | } | |
2061 | } | |
3c968887 | 2062 | |
a42d985b BVA |
2063 | ret = srpt_create_ch_ib(ch); |
2064 | if (ret) { | |
b356c1c1 VT |
2065 | rej->reason = cpu_to_be32( |
2066 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
9f5d32af | 2067 | pr_err("rejected SRP_LOGIN_REQ because creating" |
a42d985b | 2068 | " a new RDMA channel failed.\n"); |
dea26209 | 2069 | goto free_recv_ring; |
a42d985b BVA |
2070 | } |
2071 | ||
2072 | ret = srpt_ch_qp_rtr(ch, ch->qp); | |
2073 | if (ret) { | |
b356c1c1 | 2074 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
9f5d32af | 2075 | pr_err("rejected SRP_LOGIN_REQ because enabling" |
a42d985b BVA |
2076 | " RTR failed (error code = %d)\n", ret); |
2077 | goto destroy_ib; | |
2078 | } | |
f246c941 | 2079 | |
a1ffa467 | 2080 | guid = (__be16 *)¶m->primary_path->dgid.global.interface_id; |
2bce1a6d BVA |
2081 | snprintf(ch->ini_guid, sizeof(ch->ini_guid), "%04x:%04x:%04x:%04x", |
2082 | be16_to_cpu(guid[0]), be16_to_cpu(guid[1]), | |
2083 | be16_to_cpu(guid[2]), be16_to_cpu(guid[3])); | |
a42d985b BVA |
2084 | snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx", |
2085 | be64_to_cpu(*(__be64 *)ch->i_port_id), | |
2086 | be64_to_cpu(*(__be64 *)(ch->i_port_id + 8))); | |
2087 | ||
2088 | pr_debug("registering session %s\n", ch->sess_name); | |
2089 | ||
2bce1a6d BVA |
2090 | if (sport->port_guid_tpg.se_tpg_wwn) |
2091 | ch->sess = target_alloc_session(&sport->port_guid_tpg, 0, 0, | |
2092 | TARGET_PROT_NORMAL, | |
2093 | ch->ini_guid, ch, NULL); | |
2094 | if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess)) | |
2095 | ch->sess = target_alloc_session(&sport->port_gid_tpg, 0, 0, | |
0d38c240 BVA |
2096 | TARGET_PROT_NORMAL, ch->sess_name, ch, |
2097 | NULL); | |
2098 | /* Retry without leading "0x" */ | |
2bce1a6d BVA |
2099 | if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess)) |
2100 | ch->sess = target_alloc_session(&sport->port_gid_tpg, 0, 0, | |
0d38c240 BVA |
2101 | TARGET_PROT_NORMAL, |
2102 | ch->sess_name + 2, ch, NULL); | |
2bce1a6d | 2103 | if (IS_ERR_OR_NULL(ch->sess)) { |
0d38c240 BVA |
2104 | pr_info("Rejected login because no ACL has been configured yet for initiator %s.\n", |
2105 | ch->sess_name); | |
b42057ab NB |
2106 | rej->reason = cpu_to_be32((PTR_ERR(ch->sess) == -ENOMEM) ? |
2107 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES : | |
f246c941 | 2108 | SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED); |
f246c941 | 2109 | goto destroy_ib; |
a42d985b | 2110 | } |
a42d985b BVA |
2111 | |
2112 | pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess, | |
2113 | ch->sess_name, ch->cm_id); | |
2114 | ||
2115 | /* create srp_login_response */ | |
2116 | rsp->opcode = SRP_LOGIN_RSP; | |
2117 | rsp->tag = req->tag; | |
2118 | rsp->max_it_iu_len = req->req_it_iu_len; | |
2119 | rsp->max_ti_iu_len = req->req_it_iu_len; | |
2120 | ch->max_ti_iu_len = it_iu_len; | |
b356c1c1 VT |
2121 | rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2122 | | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b BVA |
2123 | rsp->req_lim_delta = cpu_to_be32(ch->rq_size); |
2124 | atomic_set(&ch->req_lim, ch->rq_size); | |
2125 | atomic_set(&ch->req_lim_delta, 0); | |
2126 | ||
2127 | /* create cm reply */ | |
2128 | rep_param->qp_num = ch->qp->qp_num; | |
2129 | rep_param->private_data = (void *)rsp; | |
9d2aa2b4 | 2130 | rep_param->private_data_len = sizeof(*rsp); |
a42d985b BVA |
2131 | rep_param->rnr_retry_count = 7; |
2132 | rep_param->flow_control = 1; | |
2133 | rep_param->failover_accepted = 0; | |
2134 | rep_param->srq = 1; | |
2135 | rep_param->responder_resources = 4; | |
2136 | rep_param->initiator_depth = 4; | |
2137 | ||
2138 | ret = ib_send_cm_rep(cm_id, rep_param); | |
2139 | if (ret) { | |
9f5d32af | 2140 | pr_err("sending SRP_LOGIN_REQ response failed" |
a42d985b BVA |
2141 | " (error code = %d)\n", ret); |
2142 | goto release_channel; | |
2143 | } | |
2144 | ||
8628991f | 2145 | mutex_lock(&sdev->mutex); |
a42d985b | 2146 | list_add_tail(&ch->list, &sdev->rch_list); |
8628991f | 2147 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
2148 | |
2149 | goto out; | |
2150 | ||
2151 | release_channel: | |
aaf45bd8 | 2152 | srpt_disconnect_ch(ch); |
a42d985b | 2153 | transport_deregister_session_configfs(ch->sess); |
a42d985b BVA |
2154 | transport_deregister_session(ch->sess); |
2155 | ch->sess = NULL; | |
2156 | ||
2157 | destroy_ib: | |
2158 | srpt_destroy_ch_ib(ch); | |
2159 | ||
dea26209 BVA |
2160 | free_recv_ring: |
2161 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, | |
2162 | ch->sport->sdev, ch->rq_size, | |
2163 | srp_max_req_size, DMA_FROM_DEVICE); | |
2164 | ||
a42d985b BVA |
2165 | free_ring: |
2166 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
2167 | ch->sport->sdev, ch->rq_size, | |
2168 | ch->rsp_size, DMA_TO_DEVICE); | |
2169 | free_ch: | |
2170 | kfree(ch); | |
2171 | ||
2172 | reject: | |
2173 | rej->opcode = SRP_LOGIN_REJ; | |
2174 | rej->tag = req->tag; | |
b356c1c1 VT |
2175 | rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
2176 | | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b BVA |
2177 | |
2178 | ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, | |
9d2aa2b4 | 2179 | (void *)rej, sizeof(*rej)); |
a42d985b BVA |
2180 | |
2181 | out: | |
2182 | kfree(rep_param); | |
2183 | kfree(rsp); | |
2184 | kfree(rej); | |
2185 | ||
2186 | return ret; | |
2187 | } | |
2188 | ||
2739b592 BVA |
2189 | static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch, |
2190 | enum ib_cm_rej_reason reason, | |
2191 | const u8 *private_data, | |
2192 | u8 private_data_len) | |
a42d985b | 2193 | { |
c13c90ea BVA |
2194 | char *priv = NULL; |
2195 | int i; | |
2196 | ||
2197 | if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1, | |
2198 | GFP_KERNEL))) { | |
2199 | for (i = 0; i < private_data_len; i++) | |
2200 | sprintf(priv + 3 * i, " %02x", private_data[i]); | |
2201 | } | |
2202 | pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n", | |
2203 | ch->sess_name, ch->qp->qp_num, reason, private_data_len ? | |
2204 | "; private data" : "", priv ? priv : " (?)"); | |
2205 | kfree(priv); | |
a42d985b BVA |
2206 | } |
2207 | ||
2208 | /** | |
2209 | * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event. | |
2210 | * | |
2211 | * An IB_CM_RTU_RECEIVED message indicates that the connection is established | |
2212 | * and that the recipient may begin transmitting (RTU = ready to use). | |
2213 | */ | |
2739b592 | 2214 | static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch) |
a42d985b | 2215 | { |
a42d985b BVA |
2216 | int ret; |
2217 | ||
f130c220 | 2218 | if (srpt_set_ch_state(ch, CH_LIVE)) { |
a42d985b BVA |
2219 | ret = srpt_ch_qp_rts(ch, ch->qp); |
2220 | ||
387add46 BVA |
2221 | if (ret == 0) { |
2222 | /* Trigger wait list processing. */ | |
2223 | ret = srpt_zerolength_write(ch); | |
2224 | WARN_ONCE(ret < 0, "%d\n", ret); | |
2225 | } else { | |
a42d985b | 2226 | srpt_close_ch(ch); |
387add46 | 2227 | } |
a42d985b BVA |
2228 | } |
2229 | } | |
2230 | ||
a42d985b BVA |
2231 | /** |
2232 | * srpt_cm_handler() - IB connection manager callback function. | |
2233 | * | |
2234 | * A non-zero return value will cause the caller destroy the CM ID. | |
2235 | * | |
2236 | * Note: srpt_cm_handler() must only return a non-zero value when transferring | |
2237 | * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning | |
2238 | * a non-zero value in any other case will trigger a race with the | |
2239 | * ib_destroy_cm_id() call in srpt_release_channel(). | |
2240 | */ | |
2241 | static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
2242 | { | |
2739b592 | 2243 | struct srpt_rdma_ch *ch = cm_id->context; |
a42d985b BVA |
2244 | int ret; |
2245 | ||
2246 | ret = 0; | |
2247 | switch (event->event) { | |
2248 | case IB_CM_REQ_RECEIVED: | |
2249 | ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd, | |
2250 | event->private_data); | |
2251 | break; | |
2252 | case IB_CM_REJ_RECEIVED: | |
2739b592 BVA |
2253 | srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason, |
2254 | event->private_data, | |
2255 | IB_CM_REJ_PRIVATE_DATA_SIZE); | |
a42d985b BVA |
2256 | break; |
2257 | case IB_CM_RTU_RECEIVED: | |
2258 | case IB_CM_USER_ESTABLISHED: | |
2739b592 | 2259 | srpt_cm_rtu_recv(ch); |
a42d985b BVA |
2260 | break; |
2261 | case IB_CM_DREQ_RECEIVED: | |
aaf45bd8 | 2262 | srpt_disconnect_ch(ch); |
a42d985b BVA |
2263 | break; |
2264 | case IB_CM_DREP_RECEIVED: | |
2739b592 BVA |
2265 | pr_info("Received CM DREP message for ch %s-%d.\n", |
2266 | ch->sess_name, ch->qp->qp_num); | |
aaf45bd8 | 2267 | srpt_close_ch(ch); |
a42d985b BVA |
2268 | break; |
2269 | case IB_CM_TIMEWAIT_EXIT: | |
2739b592 BVA |
2270 | pr_info("Received CM TimeWait exit for ch %s-%d.\n", |
2271 | ch->sess_name, ch->qp->qp_num); | |
aaf45bd8 | 2272 | srpt_close_ch(ch); |
a42d985b BVA |
2273 | break; |
2274 | case IB_CM_REP_ERROR: | |
2739b592 BVA |
2275 | pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
2276 | ch->qp->qp_num); | |
a42d985b BVA |
2277 | break; |
2278 | case IB_CM_DREQ_ERROR: | |
1e20a2a5 | 2279 | pr_info("Received CM DREQ ERROR event.\n"); |
a42d985b BVA |
2280 | break; |
2281 | case IB_CM_MRA_RECEIVED: | |
1e20a2a5 | 2282 | pr_info("Received CM MRA event\n"); |
a42d985b BVA |
2283 | break; |
2284 | default: | |
1e20a2a5 | 2285 | pr_err("received unrecognized CM event %d\n", event->event); |
a42d985b BVA |
2286 | break; |
2287 | } | |
2288 | ||
2289 | return ret; | |
2290 | } | |
2291 | ||
a42d985b BVA |
2292 | static int srpt_write_pending_status(struct se_cmd *se_cmd) |
2293 | { | |
2294 | struct srpt_send_ioctx *ioctx; | |
2295 | ||
2296 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2297 | return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA; | |
2298 | } | |
2299 | ||
2300 | /* | |
2301 | * srpt_write_pending() - Start data transfer from initiator to target (write). | |
2302 | */ | |
2303 | static int srpt_write_pending(struct se_cmd *se_cmd) | |
2304 | { | |
fc3af58d BVA |
2305 | struct srpt_send_ioctx *ioctx = |
2306 | container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2307 | struct srpt_rdma_ch *ch = ioctx->ch; | |
b99f8e4d CH |
2308 | struct ib_send_wr *first_wr = NULL, *bad_wr; |
2309 | struct ib_cqe *cqe = &ioctx->rdma_cqe; | |
a42d985b | 2310 | enum srpt_command_state new_state; |
b99f8e4d | 2311 | int ret, i; |
a42d985b BVA |
2312 | |
2313 | new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA); | |
2314 | WARN_ON(new_state == SRPT_STATE_DONE); | |
b99f8e4d CH |
2315 | |
2316 | if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) { | |
2317 | pr_warn("%s: IB send queue full (needed %d)\n", | |
2318 | __func__, ioctx->n_rdma); | |
2319 | ret = -ENOMEM; | |
2320 | goto out_undo; | |
2321 | } | |
2322 | ||
2323 | cqe->done = srpt_rdma_read_done; | |
2324 | for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) { | |
2325 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
2326 | ||
2327 | first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port, | |
2328 | cqe, first_wr); | |
2329 | cqe = NULL; | |
2330 | } | |
dcc9881e | 2331 | |
b99f8e4d CH |
2332 | ret = ib_post_send(ch->qp, first_wr, &bad_wr); |
2333 | if (ret) { | |
2334 | pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n", | |
2335 | __func__, ret, ioctx->n_rdma, | |
2336 | atomic_read(&ch->sq_wr_avail)); | |
2337 | goto out_undo; | |
2338 | } | |
2339 | ||
2340 | return 0; | |
2341 | out_undo: | |
2342 | atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); | |
2343 | return ret; | |
a42d985b BVA |
2344 | } |
2345 | ||
2346 | static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status) | |
2347 | { | |
2348 | switch (tcm_mgmt_status) { | |
2349 | case TMR_FUNCTION_COMPLETE: | |
2350 | return SRP_TSK_MGMT_SUCCESS; | |
2351 | case TMR_FUNCTION_REJECTED: | |
2352 | return SRP_TSK_MGMT_FUNC_NOT_SUPP; | |
2353 | } | |
2354 | return SRP_TSK_MGMT_FAILED; | |
2355 | } | |
2356 | ||
2357 | /** | |
2358 | * srpt_queue_response() - Transmits the response to a SCSI command. | |
2359 | * | |
2360 | * Callback function called by the TCM core. Must not block since it can be | |
2361 | * invoked on the context of the IB completion handler. | |
2362 | */ | |
b79fafac | 2363 | static void srpt_queue_response(struct se_cmd *cmd) |
a42d985b | 2364 | { |
b99f8e4d CH |
2365 | struct srpt_send_ioctx *ioctx = |
2366 | container_of(cmd, struct srpt_send_ioctx, cmd); | |
2367 | struct srpt_rdma_ch *ch = ioctx->ch; | |
2368 | struct srpt_device *sdev = ch->sport->sdev; | |
10fce586 | 2369 | struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr; |
b99f8e4d | 2370 | struct ib_sge sge; |
a42d985b BVA |
2371 | enum srpt_command_state state; |
2372 | unsigned long flags; | |
b99f8e4d | 2373 | int resp_len, ret, i; |
a42d985b BVA |
2374 | u8 srp_tm_status; |
2375 | ||
a42d985b BVA |
2376 | BUG_ON(!ch); |
2377 | ||
2378 | spin_lock_irqsave(&ioctx->spinlock, flags); | |
2379 | state = ioctx->state; | |
2380 | switch (state) { | |
2381 | case SRPT_STATE_NEW: | |
2382 | case SRPT_STATE_DATA_IN: | |
2383 | ioctx->state = SRPT_STATE_CMD_RSP_SENT; | |
2384 | break; | |
2385 | case SRPT_STATE_MGMT: | |
2386 | ioctx->state = SRPT_STATE_MGMT_RSP_SENT; | |
2387 | break; | |
2388 | default: | |
2389 | WARN(true, "ch %p; cmd %d: unexpected command state %d\n", | |
2390 | ch, ioctx->ioctx.index, ioctx->state); | |
2391 | break; | |
2392 | } | |
2393 | spin_unlock_irqrestore(&ioctx->spinlock, flags); | |
2394 | ||
55d69427 | 2395 | if (unlikely(WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) |
b79fafac | 2396 | return; |
a42d985b | 2397 | |
a42d985b | 2398 | /* For read commands, transfer the data to the initiator. */ |
b99f8e4d CH |
2399 | if (ioctx->cmd.data_direction == DMA_FROM_DEVICE && |
2400 | ioctx->cmd.data_length && | |
a42d985b | 2401 | !ioctx->queue_status_only) { |
b99f8e4d CH |
2402 | for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) { |
2403 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
2404 | ||
2405 | first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, | |
10fce586 | 2406 | ch->sport->port, NULL, first_wr); |
a42d985b BVA |
2407 | } |
2408 | } | |
2409 | ||
2410 | if (state != SRPT_STATE_MGMT) | |
649ee054 | 2411 | resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag, |
a42d985b BVA |
2412 | cmd->scsi_status); |
2413 | else { | |
2414 | srp_tm_status | |
2415 | = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response); | |
2416 | resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status, | |
649ee054 | 2417 | ioctx->cmd.tag); |
a42d985b | 2418 | } |
b99f8e4d CH |
2419 | |
2420 | atomic_inc(&ch->req_lim); | |
2421 | ||
2422 | if (unlikely(atomic_sub_return(1 + ioctx->n_rdma, | |
2423 | &ch->sq_wr_avail) < 0)) { | |
2424 | pr_warn("%s: IB send queue full (needed %d)\n", | |
2425 | __func__, ioctx->n_rdma); | |
2426 | ret = -ENOMEM; | |
2427 | goto out; | |
2428 | } | |
2429 | ||
2430 | ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len, | |
2431 | DMA_TO_DEVICE); | |
2432 | ||
2433 | sge.addr = ioctx->ioctx.dma; | |
2434 | sge.length = resp_len; | |
74333f12 | 2435 | sge.lkey = sdev->lkey; |
b99f8e4d CH |
2436 | |
2437 | ioctx->ioctx.cqe.done = srpt_send_done; | |
2438 | send_wr.next = NULL; | |
2439 | send_wr.wr_cqe = &ioctx->ioctx.cqe; | |
2440 | send_wr.sg_list = &sge; | |
2441 | send_wr.num_sge = 1; | |
2442 | send_wr.opcode = IB_WR_SEND; | |
2443 | send_wr.send_flags = IB_SEND_SIGNALED; | |
2444 | ||
2445 | ret = ib_post_send(ch->qp, first_wr, &bad_wr); | |
2446 | if (ret < 0) { | |
2447 | pr_err("%s: sending cmd response failed for tag %llu (%d)\n", | |
2448 | __func__, ioctx->cmd.tag, ret); | |
2449 | goto out; | |
a42d985b | 2450 | } |
b99f8e4d CH |
2451 | |
2452 | return; | |
2453 | ||
2454 | out: | |
2455 | atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail); | |
2456 | atomic_dec(&ch->req_lim); | |
2457 | srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); | |
2458 | target_put_sess_cmd(&ioctx->cmd); | |
b79fafac | 2459 | } |
a42d985b | 2460 | |
b79fafac JE |
2461 | static int srpt_queue_data_in(struct se_cmd *cmd) |
2462 | { | |
2463 | srpt_queue_response(cmd); | |
2464 | return 0; | |
2465 | } | |
2466 | ||
2467 | static void srpt_queue_tm_rsp(struct se_cmd *cmd) | |
2468 | { | |
2469 | srpt_queue_response(cmd); | |
a42d985b BVA |
2470 | } |
2471 | ||
131e6abc NB |
2472 | static void srpt_aborted_task(struct se_cmd *cmd) |
2473 | { | |
131e6abc NB |
2474 | } |
2475 | ||
a42d985b BVA |
2476 | static int srpt_queue_status(struct se_cmd *cmd) |
2477 | { | |
2478 | struct srpt_send_ioctx *ioctx; | |
2479 | ||
2480 | ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); | |
2481 | BUG_ON(ioctx->sense_data != cmd->sense_buffer); | |
2482 | if (cmd->se_cmd_flags & | |
2483 | (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE)) | |
2484 | WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION); | |
2485 | ioctx->queue_status_only = true; | |
b79fafac JE |
2486 | srpt_queue_response(cmd); |
2487 | return 0; | |
a42d985b BVA |
2488 | } |
2489 | ||
2490 | static void srpt_refresh_port_work(struct work_struct *work) | |
2491 | { | |
2492 | struct srpt_port *sport = container_of(work, struct srpt_port, work); | |
2493 | ||
2494 | srpt_refresh_port(sport); | |
2495 | } | |
2496 | ||
a42d985b BVA |
2497 | /** |
2498 | * srpt_release_sdev() - Free the channel resources associated with a target. | |
2499 | */ | |
2500 | static int srpt_release_sdev(struct srpt_device *sdev) | |
2501 | { | |
aaf45bd8 | 2502 | int i, res; |
a42d985b BVA |
2503 | |
2504 | WARN_ON_ONCE(irqs_disabled()); | |
2505 | ||
2506 | BUG_ON(!sdev); | |
2507 | ||
8628991f | 2508 | mutex_lock(&sdev->mutex); |
aaf45bd8 | 2509 | for (i = 0; i < ARRAY_SIZE(sdev->port); i++) |
8b6dc529 | 2510 | srpt_set_enabled(&sdev->port[i], false); |
8628991f | 2511 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
2512 | |
2513 | res = wait_event_interruptible(sdev->ch_releaseQ, | |
8628991f | 2514 | list_empty_careful(&sdev->rch_list)); |
a42d985b | 2515 | if (res) |
9f5d32af | 2516 | pr_err("%s: interrupted.\n", __func__); |
a42d985b BVA |
2517 | |
2518 | return 0; | |
2519 | } | |
2520 | ||
2bce1a6d | 2521 | static struct se_wwn *__srpt_lookup_wwn(const char *name) |
a42d985b BVA |
2522 | { |
2523 | struct ib_device *dev; | |
2524 | struct srpt_device *sdev; | |
2525 | struct srpt_port *sport; | |
2526 | int i; | |
2527 | ||
2528 | list_for_each_entry(sdev, &srpt_dev_list, list) { | |
2529 | dev = sdev->device; | |
2530 | if (!dev) | |
2531 | continue; | |
2532 | ||
2533 | for (i = 0; i < dev->phys_port_cnt; i++) { | |
2534 | sport = &sdev->port[i]; | |
2535 | ||
2bce1a6d BVA |
2536 | if (strcmp(sport->port_guid, name) == 0) |
2537 | return &sport->port_guid_wwn; | |
2538 | if (strcmp(sport->port_gid, name) == 0) | |
2539 | return &sport->port_gid_wwn; | |
a42d985b BVA |
2540 | } |
2541 | } | |
2542 | ||
2543 | return NULL; | |
2544 | } | |
2545 | ||
2bce1a6d | 2546 | static struct se_wwn *srpt_lookup_wwn(const char *name) |
a42d985b | 2547 | { |
2bce1a6d | 2548 | struct se_wwn *wwn; |
a42d985b BVA |
2549 | |
2550 | spin_lock(&srpt_dev_lock); | |
2bce1a6d | 2551 | wwn = __srpt_lookup_wwn(name); |
a42d985b BVA |
2552 | spin_unlock(&srpt_dev_lock); |
2553 | ||
2bce1a6d | 2554 | return wwn; |
a42d985b BVA |
2555 | } |
2556 | ||
c76d7d64 BVA |
2557 | static void srpt_free_srq(struct srpt_device *sdev) |
2558 | { | |
2559 | if (!sdev->srq) | |
2560 | return; | |
2561 | ||
2562 | ib_destroy_srq(sdev->srq); | |
2563 | srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, | |
2564 | sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE); | |
2565 | sdev->srq = NULL; | |
2566 | } | |
2567 | ||
2568 | static int srpt_alloc_srq(struct srpt_device *sdev) | |
2569 | { | |
2570 | struct ib_srq_init_attr srq_attr = { | |
2571 | .event_handler = srpt_srq_event, | |
2572 | .srq_context = (void *)sdev, | |
2573 | .attr.max_wr = sdev->srq_size, | |
2574 | .attr.max_sge = 1, | |
2575 | .srq_type = IB_SRQT_BASIC, | |
2576 | }; | |
2577 | struct ib_device *device = sdev->device; | |
2578 | struct ib_srq *srq; | |
2579 | int i; | |
2580 | ||
2581 | WARN_ON_ONCE(sdev->srq); | |
2582 | srq = ib_create_srq(sdev->pd, &srq_attr); | |
2583 | if (IS_ERR(srq)) { | |
2584 | pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq)); | |
2585 | return PTR_ERR(srq); | |
2586 | } | |
2587 | ||
2588 | pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size, | |
2589 | sdev->device->attrs.max_srq_wr, device->name); | |
2590 | ||
2591 | sdev->ioctx_ring = (struct srpt_recv_ioctx **) | |
2592 | srpt_alloc_ioctx_ring(sdev, sdev->srq_size, | |
2593 | sizeof(*sdev->ioctx_ring[0]), | |
2594 | srp_max_req_size, DMA_FROM_DEVICE); | |
2595 | if (!sdev->ioctx_ring) { | |
2596 | ib_destroy_srq(srq); | |
2597 | return -ENOMEM; | |
2598 | } | |
2599 | ||
2600 | sdev->use_srq = true; | |
2601 | sdev->srq = srq; | |
2602 | ||
2603 | for (i = 0; i < sdev->srq_size; ++i) | |
2604 | srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]); | |
2605 | ||
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | static int srpt_use_srq(struct srpt_device *sdev, bool use_srq) | |
2610 | { | |
2611 | struct ib_device *device = sdev->device; | |
2612 | int ret = 0; | |
2613 | ||
2614 | if (!use_srq) { | |
2615 | srpt_free_srq(sdev); | |
2616 | sdev->use_srq = false; | |
2617 | } else if (use_srq && !sdev->srq) { | |
2618 | ret = srpt_alloc_srq(sdev); | |
2619 | } | |
2620 | pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__, device->name, | |
2621 | sdev->use_srq, ret); | |
2622 | return ret; | |
2623 | } | |
2624 | ||
a42d985b BVA |
2625 | /** |
2626 | * srpt_add_one() - Infiniband device addition callback function. | |
2627 | */ | |
2628 | static void srpt_add_one(struct ib_device *device) | |
2629 | { | |
2630 | struct srpt_device *sdev; | |
2631 | struct srpt_port *sport; | |
a42d985b BVA |
2632 | int i; |
2633 | ||
e3dfa60c | 2634 | pr_debug("device = %p\n", device); |
a42d985b | 2635 | |
9d2aa2b4 | 2636 | sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); |
a42d985b BVA |
2637 | if (!sdev) |
2638 | goto err; | |
2639 | ||
2640 | sdev->device = device; | |
2641 | INIT_LIST_HEAD(&sdev->rch_list); | |
2642 | init_waitqueue_head(&sdev->ch_releaseQ); | |
8628991f | 2643 | mutex_init(&sdev->mutex); |
a42d985b | 2644 | |
ed082d36 | 2645 | sdev->pd = ib_alloc_pd(device, 0); |
a42d985b BVA |
2646 | if (IS_ERR(sdev->pd)) |
2647 | goto free_dev; | |
2648 | ||
74333f12 | 2649 | sdev->lkey = sdev->pd->local_dma_lkey; |
a42d985b | 2650 | |
4a061b28 | 2651 | sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr); |
a42d985b | 2652 | |
c76d7d64 | 2653 | srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq); |
a42d985b BVA |
2654 | |
2655 | if (!srpt_service_guid) | |
2656 | srpt_service_guid = be64_to_cpu(device->node_guid); | |
2657 | ||
2658 | sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev); | |
2659 | if (IS_ERR(sdev->cm_id)) | |
dea26209 | 2660 | goto err_ring; |
a42d985b BVA |
2661 | |
2662 | /* print out target login information */ | |
2663 | pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx," | |
2664 | "pkey=ffff,service_id=%016llx\n", srpt_service_guid, | |
2665 | srpt_service_guid, srpt_service_guid); | |
2666 | ||
2667 | /* | |
2668 | * We do not have a consistent service_id (ie. also id_ext of target_id) | |
2669 | * to identify this target. We currently use the guid of the first HCA | |
2670 | * in the system as service_id; therefore, the target_id will change | |
2671 | * if this HCA is gone bad and replaced by different HCA | |
2672 | */ | |
73fec7fd | 2673 | if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0)) |
a42d985b BVA |
2674 | goto err_cm; |
2675 | ||
2676 | INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device, | |
2677 | srpt_event_handler); | |
dcc9881e | 2678 | ib_register_event_handler(&sdev->event_handler); |
a42d985b | 2679 | |
f225066b | 2680 | WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port)); |
a42d985b BVA |
2681 | |
2682 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
2683 | sport = &sdev->port[i - 1]; | |
2684 | sport->sdev = sdev; | |
2685 | sport->port = i; | |
2686 | sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE; | |
2687 | sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE; | |
2688 | sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE; | |
dea26209 | 2689 | sport->port_attrib.use_srq = false; |
a42d985b | 2690 | INIT_WORK(&sport->work, srpt_refresh_port_work); |
a42d985b BVA |
2691 | |
2692 | if (srpt_refresh_port(sport)) { | |
9f5d32af | 2693 | pr_err("MAD registration failed for %s-%d.\n", |
f68cba4e | 2694 | sdev->device->name, i); |
dea26209 | 2695 | goto err_event; |
a42d985b | 2696 | } |
a42d985b BVA |
2697 | } |
2698 | ||
2699 | spin_lock(&srpt_dev_lock); | |
2700 | list_add_tail(&sdev->list, &srpt_dev_list); | |
2701 | spin_unlock(&srpt_dev_lock); | |
2702 | ||
2703 | out: | |
2704 | ib_set_client_data(device, &srpt_client, sdev); | |
2705 | pr_debug("added %s.\n", device->name); | |
2706 | return; | |
2707 | ||
a42d985b BVA |
2708 | err_event: |
2709 | ib_unregister_event_handler(&sdev->event_handler); | |
2710 | err_cm: | |
2711 | ib_destroy_cm_id(sdev->cm_id); | |
dea26209 | 2712 | err_ring: |
c76d7d64 | 2713 | srpt_free_srq(sdev); |
a42d985b BVA |
2714 | ib_dealloc_pd(sdev->pd); |
2715 | free_dev: | |
2716 | kfree(sdev); | |
2717 | err: | |
2718 | sdev = NULL; | |
9f5d32af | 2719 | pr_info("%s(%s) failed.\n", __func__, device->name); |
a42d985b BVA |
2720 | goto out; |
2721 | } | |
2722 | ||
2723 | /** | |
2724 | * srpt_remove_one() - InfiniBand device removal callback function. | |
2725 | */ | |
7c1eb45a | 2726 | static void srpt_remove_one(struct ib_device *device, void *client_data) |
a42d985b | 2727 | { |
7c1eb45a | 2728 | struct srpt_device *sdev = client_data; |
a42d985b BVA |
2729 | int i; |
2730 | ||
a42d985b | 2731 | if (!sdev) { |
9f5d32af | 2732 | pr_info("%s(%s): nothing to do.\n", __func__, device->name); |
a42d985b BVA |
2733 | return; |
2734 | } | |
2735 | ||
2736 | srpt_unregister_mad_agent(sdev); | |
2737 | ||
2738 | ib_unregister_event_handler(&sdev->event_handler); | |
2739 | ||
2740 | /* Cancel any work queued by the just unregistered IB event handler. */ | |
2741 | for (i = 0; i < sdev->device->phys_port_cnt; i++) | |
2742 | cancel_work_sync(&sdev->port[i].work); | |
2743 | ||
2744 | ib_destroy_cm_id(sdev->cm_id); | |
2745 | ||
2746 | /* | |
2747 | * Unregistering a target must happen after destroying sdev->cm_id | |
2748 | * such that no new SRP_LOGIN_REQ information units can arrive while | |
2749 | * destroying the target. | |
2750 | */ | |
2751 | spin_lock(&srpt_dev_lock); | |
2752 | list_del(&sdev->list); | |
2753 | spin_unlock(&srpt_dev_lock); | |
2754 | srpt_release_sdev(sdev); | |
2755 | ||
c76d7d64 BVA |
2756 | srpt_free_srq(sdev); |
2757 | ||
a42d985b BVA |
2758 | ib_dealloc_pd(sdev->pd); |
2759 | ||
a42d985b BVA |
2760 | kfree(sdev); |
2761 | } | |
2762 | ||
2763 | static struct ib_client srpt_client = { | |
2764 | .name = DRV_NAME, | |
2765 | .add = srpt_add_one, | |
2766 | .remove = srpt_remove_one | |
2767 | }; | |
2768 | ||
2769 | static int srpt_check_true(struct se_portal_group *se_tpg) | |
2770 | { | |
2771 | return 1; | |
2772 | } | |
2773 | ||
2774 | static int srpt_check_false(struct se_portal_group *se_tpg) | |
2775 | { | |
2776 | return 0; | |
2777 | } | |
2778 | ||
2779 | static char *srpt_get_fabric_name(void) | |
2780 | { | |
2781 | return "srpt"; | |
2782 | } | |
2783 | ||
2bce1a6d BVA |
2784 | static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg) |
2785 | { | |
2786 | return tpg->se_tpg_wwn->priv; | |
2787 | } | |
2788 | ||
a42d985b BVA |
2789 | static char *srpt_get_fabric_wwn(struct se_portal_group *tpg) |
2790 | { | |
2bce1a6d | 2791 | struct srpt_port *sport = srpt_tpg_to_sport(tpg); |
a42d985b | 2792 | |
2bce1a6d BVA |
2793 | WARN_ON_ONCE(tpg != &sport->port_guid_tpg && |
2794 | tpg != &sport->port_gid_tpg); | |
2795 | return tpg == &sport->port_guid_tpg ? sport->port_guid : | |
2796 | sport->port_gid; | |
a42d985b BVA |
2797 | } |
2798 | ||
2799 | static u16 srpt_get_tag(struct se_portal_group *tpg) | |
2800 | { | |
2801 | return 1; | |
2802 | } | |
2803 | ||
a42d985b BVA |
2804 | static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg) |
2805 | { | |
2806 | return 1; | |
2807 | } | |
2808 | ||
2809 | static void srpt_release_cmd(struct se_cmd *se_cmd) | |
2810 | { | |
9474b043 NB |
2811 | struct srpt_send_ioctx *ioctx = container_of(se_cmd, |
2812 | struct srpt_send_ioctx, cmd); | |
2813 | struct srpt_rdma_ch *ch = ioctx->ch; | |
3c968887 | 2814 | unsigned long flags; |
9474b043 | 2815 | |
bd2c52d7 BVA |
2816 | WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE && |
2817 | !(ioctx->cmd.transport_state & CMD_T_ABORTED)); | |
9474b043 | 2818 | |
b99f8e4d CH |
2819 | if (ioctx->n_rw_ctx) { |
2820 | srpt_free_rw_ctxs(ch, ioctx); | |
2821 | ioctx->n_rw_ctx = 0; | |
9474b043 NB |
2822 | } |
2823 | ||
3c968887 BVA |
2824 | spin_lock_irqsave(&ch->spinlock, flags); |
2825 | list_add(&ioctx->free_list, &ch->free_list); | |
2826 | spin_unlock_irqrestore(&ch->spinlock, flags); | |
a42d985b BVA |
2827 | } |
2828 | ||
a42d985b BVA |
2829 | /** |
2830 | * srpt_close_session() - Forcibly close a session. | |
2831 | * | |
2832 | * Callback function invoked by the TCM core to clean up sessions associated | |
2833 | * with a node ACL when the user invokes | |
2834 | * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
2835 | */ | |
2836 | static void srpt_close_session(struct se_session *se_sess) | |
2837 | { | |
f108f0f6 BVA |
2838 | struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr; |
2839 | struct srpt_device *sdev = ch->sport->sdev; | |
a42d985b | 2840 | |
8628991f | 2841 | mutex_lock(&sdev->mutex); |
01b3ee13 | 2842 | srpt_disconnect_ch_sync(ch); |
8628991f | 2843 | mutex_unlock(&sdev->mutex); |
a42d985b BVA |
2844 | } |
2845 | ||
a42d985b BVA |
2846 | /** |
2847 | * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB). | |
2848 | * | |
2849 | * A quote from RFC 4455 (SCSI-MIB) about this MIB object: | |
2850 | * This object represents an arbitrary integer used to uniquely identify a | |
2851 | * particular attached remote initiator port to a particular SCSI target port | |
2852 | * within a particular SCSI target device within a particular SCSI instance. | |
2853 | */ | |
2854 | static u32 srpt_sess_get_index(struct se_session *se_sess) | |
2855 | { | |
2856 | return 0; | |
2857 | } | |
2858 | ||
2859 | static void srpt_set_default_node_attrs(struct se_node_acl *nacl) | |
2860 | { | |
2861 | } | |
2862 | ||
a42d985b BVA |
2863 | /* Note: only used from inside debug printk's by the TCM core. */ |
2864 | static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd) | |
2865 | { | |
2866 | struct srpt_send_ioctx *ioctx; | |
2867 | ||
2868 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2869 | return srpt_get_cmd_state(ioctx); | |
2870 | } | |
2871 | ||
2bce1a6d BVA |
2872 | static int srpt_parse_guid(u64 *guid, const char *name) |
2873 | { | |
2874 | u16 w[4]; | |
2875 | int ret = -EINVAL; | |
2876 | ||
2877 | if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4) | |
2878 | goto out; | |
2879 | *guid = get_unaligned_be64(w); | |
2880 | ret = 0; | |
2881 | out: | |
2882 | return ret; | |
2883 | } | |
2884 | ||
a42d985b BVA |
2885 | /** |
2886 | * srpt_parse_i_port_id() - Parse an initiator port ID. | |
2887 | * @name: ASCII representation of a 128-bit initiator port ID. | |
2888 | * @i_port_id: Binary 128-bit port ID. | |
2889 | */ | |
2890 | static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name) | |
2891 | { | |
2892 | const char *p; | |
2893 | unsigned len, count, leading_zero_bytes; | |
c70ca389 | 2894 | int ret; |
a42d985b BVA |
2895 | |
2896 | p = name; | |
b60459f0 | 2897 | if (strncasecmp(p, "0x", 2) == 0) |
a42d985b BVA |
2898 | p += 2; |
2899 | ret = -EINVAL; | |
2900 | len = strlen(p); | |
2901 | if (len % 2) | |
2902 | goto out; | |
2903 | count = min(len / 2, 16U); | |
2904 | leading_zero_bytes = 16 - count; | |
2905 | memset(i_port_id, 0, leading_zero_bytes); | |
c70ca389 BVA |
2906 | ret = hex2bin(i_port_id + leading_zero_bytes, p, count); |
2907 | if (ret < 0) | |
2908 | pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", ret); | |
a42d985b BVA |
2909 | out: |
2910 | return ret; | |
2911 | } | |
2912 | ||
2913 | /* | |
2914 | * configfs callback function invoked for | |
2915 | * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
2916 | */ | |
c7d6a803 | 2917 | static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name) |
a42d985b | 2918 | { |
2bce1a6d | 2919 | u64 guid; |
a42d985b | 2920 | u8 i_port_id[16]; |
2bce1a6d | 2921 | int ret; |
a42d985b | 2922 | |
2bce1a6d BVA |
2923 | ret = srpt_parse_guid(&guid, name); |
2924 | if (ret < 0) | |
2925 | ret = srpt_parse_i_port_id(i_port_id, name); | |
2926 | if (ret < 0) | |
9f5d32af | 2927 | pr_err("invalid initiator port ID %s\n", name); |
2bce1a6d | 2928 | return ret; |
a42d985b BVA |
2929 | } |
2930 | ||
2eafd729 CH |
2931 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item, |
2932 | char *page) | |
a42d985b | 2933 | { |
2eafd729 | 2934 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 2935 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
2936 | |
2937 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size); | |
2938 | } | |
2939 | ||
2eafd729 CH |
2940 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item, |
2941 | const char *page, size_t count) | |
a42d985b | 2942 | { |
2eafd729 | 2943 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 2944 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
2945 | unsigned long val; |
2946 | int ret; | |
2947 | ||
9d8abf45 | 2948 | ret = kstrtoul(page, 0, &val); |
a42d985b | 2949 | if (ret < 0) { |
9d8abf45 | 2950 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
2951 | return -EINVAL; |
2952 | } | |
2953 | if (val > MAX_SRPT_RDMA_SIZE) { | |
2954 | pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val, | |
2955 | MAX_SRPT_RDMA_SIZE); | |
2956 | return -EINVAL; | |
2957 | } | |
2958 | if (val < DEFAULT_MAX_RDMA_SIZE) { | |
2959 | pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n", | |
2960 | val, DEFAULT_MAX_RDMA_SIZE); | |
2961 | return -EINVAL; | |
2962 | } | |
2963 | sport->port_attrib.srp_max_rdma_size = val; | |
2964 | ||
2965 | return count; | |
2966 | } | |
2967 | ||
2eafd729 CH |
2968 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item, |
2969 | char *page) | |
a42d985b | 2970 | { |
2eafd729 | 2971 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 2972 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
2973 | |
2974 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size); | |
2975 | } | |
2976 | ||
2eafd729 CH |
2977 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item, |
2978 | const char *page, size_t count) | |
a42d985b | 2979 | { |
2eafd729 | 2980 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 2981 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
2982 | unsigned long val; |
2983 | int ret; | |
2984 | ||
9d8abf45 | 2985 | ret = kstrtoul(page, 0, &val); |
a42d985b | 2986 | if (ret < 0) { |
9d8abf45 | 2987 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
2988 | return -EINVAL; |
2989 | } | |
2990 | if (val > MAX_SRPT_RSP_SIZE) { | |
2991 | pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val, | |
2992 | MAX_SRPT_RSP_SIZE); | |
2993 | return -EINVAL; | |
2994 | } | |
2995 | if (val < MIN_MAX_RSP_SIZE) { | |
2996 | pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val, | |
2997 | MIN_MAX_RSP_SIZE); | |
2998 | return -EINVAL; | |
2999 | } | |
3000 | sport->port_attrib.srp_max_rsp_size = val; | |
3001 | ||
3002 | return count; | |
3003 | } | |
3004 | ||
2eafd729 CH |
3005 | static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item, |
3006 | char *page) | |
a42d985b | 3007 | { |
2eafd729 | 3008 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3009 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3010 | |
3011 | return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size); | |
3012 | } | |
3013 | ||
2eafd729 CH |
3014 | static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item, |
3015 | const char *page, size_t count) | |
a42d985b | 3016 | { |
2eafd729 | 3017 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3018 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3019 | unsigned long val; |
3020 | int ret; | |
3021 | ||
9d8abf45 | 3022 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3023 | if (ret < 0) { |
9d8abf45 | 3024 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3025 | return -EINVAL; |
3026 | } | |
3027 | if (val > MAX_SRPT_SRQ_SIZE) { | |
3028 | pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val, | |
3029 | MAX_SRPT_SRQ_SIZE); | |
3030 | return -EINVAL; | |
3031 | } | |
3032 | if (val < MIN_SRPT_SRQ_SIZE) { | |
3033 | pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val, | |
3034 | MIN_SRPT_SRQ_SIZE); | |
3035 | return -EINVAL; | |
3036 | } | |
3037 | sport->port_attrib.srp_sq_size = val; | |
3038 | ||
3039 | return count; | |
3040 | } | |
3041 | ||
dea26209 BVA |
3042 | static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item, |
3043 | char *page) | |
3044 | { | |
3045 | struct se_portal_group *se_tpg = attrib_to_tpg(item); | |
3046 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); | |
3047 | ||
3048 | return sprintf(page, "%d\n", sport->port_attrib.use_srq); | |
3049 | } | |
3050 | ||
3051 | static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item, | |
3052 | const char *page, size_t count) | |
3053 | { | |
3054 | struct se_portal_group *se_tpg = attrib_to_tpg(item); | |
3055 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); | |
57b0c460 | 3056 | struct srpt_device *sdev = sport->sdev; |
dea26209 | 3057 | unsigned long val; |
57b0c460 | 3058 | bool enabled; |
dea26209 BVA |
3059 | int ret; |
3060 | ||
3061 | ret = kstrtoul(page, 0, &val); | |
3062 | if (ret < 0) | |
3063 | return ret; | |
3064 | if (val != !!val) | |
3065 | return -EINVAL; | |
57b0c460 BVA |
3066 | |
3067 | ret = mutex_lock_interruptible(&sdev->mutex); | |
3068 | if (ret < 0) | |
3069 | return ret; | |
3070 | enabled = sport->enabled; | |
3071 | /* Log out all initiator systems before changing 'use_srq'. */ | |
3072 | srpt_set_enabled(sport, false); | |
dea26209 | 3073 | sport->port_attrib.use_srq = val; |
57b0c460 BVA |
3074 | srpt_use_srq(sdev, sport->port_attrib.use_srq); |
3075 | srpt_set_enabled(sport, enabled); | |
3076 | mutex_unlock(&sdev->mutex); | |
dea26209 BVA |
3077 | |
3078 | return count; | |
3079 | } | |
3080 | ||
2eafd729 CH |
3081 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size); |
3082 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size); | |
3083 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size); | |
dea26209 | 3084 | CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq); |
a42d985b BVA |
3085 | |
3086 | static struct configfs_attribute *srpt_tpg_attrib_attrs[] = { | |
2eafd729 CH |
3087 | &srpt_tpg_attrib_attr_srp_max_rdma_size, |
3088 | &srpt_tpg_attrib_attr_srp_max_rsp_size, | |
3089 | &srpt_tpg_attrib_attr_srp_sq_size, | |
dea26209 | 3090 | &srpt_tpg_attrib_attr_use_srq, |
a42d985b BVA |
3091 | NULL, |
3092 | }; | |
3093 | ||
2eafd729 | 3094 | static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page) |
a42d985b | 3095 | { |
2eafd729 | 3096 | struct se_portal_group *se_tpg = to_tpg(item); |
2bce1a6d | 3097 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3098 | |
3099 | return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0); | |
3100 | } | |
3101 | ||
2eafd729 CH |
3102 | static ssize_t srpt_tpg_enable_store(struct config_item *item, |
3103 | const char *page, size_t count) | |
a42d985b | 3104 | { |
2eafd729 | 3105 | struct se_portal_group *se_tpg = to_tpg(item); |
2bce1a6d | 3106 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
043a6806 | 3107 | struct srpt_device *sdev = sport->sdev; |
a42d985b BVA |
3108 | unsigned long tmp; |
3109 | int ret; | |
3110 | ||
9d8abf45 | 3111 | ret = kstrtoul(page, 0, &tmp); |
a42d985b | 3112 | if (ret < 0) { |
9f5d32af | 3113 | pr_err("Unable to extract srpt_tpg_store_enable\n"); |
a42d985b BVA |
3114 | return -EINVAL; |
3115 | } | |
3116 | ||
3117 | if ((tmp != 0) && (tmp != 1)) { | |
9f5d32af | 3118 | pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp); |
a42d985b BVA |
3119 | return -EINVAL; |
3120 | } | |
a42d985b | 3121 | |
043a6806 | 3122 | mutex_lock(&sdev->mutex); |
8b6dc529 | 3123 | srpt_set_enabled(sport, tmp); |
043a6806 BVA |
3124 | mutex_unlock(&sdev->mutex); |
3125 | ||
a42d985b BVA |
3126 | return count; |
3127 | } | |
3128 | ||
2eafd729 | 3129 | CONFIGFS_ATTR(srpt_tpg_, enable); |
a42d985b BVA |
3130 | |
3131 | static struct configfs_attribute *srpt_tpg_attrs[] = { | |
2eafd729 | 3132 | &srpt_tpg_attr_enable, |
a42d985b BVA |
3133 | NULL, |
3134 | }; | |
3135 | ||
3136 | /** | |
3137 | * configfs callback invoked for | |
3138 | * mkdir /sys/kernel/config/target/$driver/$port/$tpg | |
3139 | */ | |
3140 | static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn, | |
3141 | struct config_group *group, | |
3142 | const char *name) | |
3143 | { | |
2bce1a6d BVA |
3144 | struct srpt_port *sport = wwn->priv; |
3145 | static struct se_portal_group *tpg; | |
a42d985b BVA |
3146 | int res; |
3147 | ||
2bce1a6d BVA |
3148 | WARN_ON_ONCE(wwn != &sport->port_guid_wwn && |
3149 | wwn != &sport->port_gid_wwn); | |
3150 | tpg = wwn == &sport->port_guid_wwn ? &sport->port_guid_tpg : | |
3151 | &sport->port_gid_tpg; | |
3152 | res = core_tpg_register(wwn, tpg, SCSI_PROTOCOL_SRP); | |
a42d985b BVA |
3153 | if (res) |
3154 | return ERR_PTR(res); | |
3155 | ||
2bce1a6d | 3156 | return tpg; |
a42d985b BVA |
3157 | } |
3158 | ||
3159 | /** | |
3160 | * configfs callback invoked for | |
3161 | * rmdir /sys/kernel/config/target/$driver/$port/$tpg | |
3162 | */ | |
3163 | static void srpt_drop_tpg(struct se_portal_group *tpg) | |
3164 | { | |
2bce1a6d | 3165 | struct srpt_port *sport = srpt_tpg_to_sport(tpg); |
a42d985b BVA |
3166 | |
3167 | sport->enabled = false; | |
2bce1a6d | 3168 | core_tpg_deregister(tpg); |
a42d985b BVA |
3169 | } |
3170 | ||
3171 | /** | |
3172 | * configfs callback invoked for | |
3173 | * mkdir /sys/kernel/config/target/$driver/$port | |
3174 | */ | |
3175 | static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf, | |
3176 | struct config_group *group, | |
3177 | const char *name) | |
3178 | { | |
2bce1a6d | 3179 | return srpt_lookup_wwn(name) ? : ERR_PTR(-EINVAL); |
a42d985b BVA |
3180 | } |
3181 | ||
3182 | /** | |
3183 | * configfs callback invoked for | |
3184 | * rmdir /sys/kernel/config/target/$driver/$port | |
3185 | */ | |
3186 | static void srpt_drop_tport(struct se_wwn *wwn) | |
3187 | { | |
a42d985b BVA |
3188 | } |
3189 | ||
2eafd729 | 3190 | static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf) |
a42d985b BVA |
3191 | { |
3192 | return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION); | |
3193 | } | |
3194 | ||
2eafd729 | 3195 | CONFIGFS_ATTR_RO(srpt_wwn_, version); |
a42d985b BVA |
3196 | |
3197 | static struct configfs_attribute *srpt_wwn_attrs[] = { | |
2eafd729 | 3198 | &srpt_wwn_attr_version, |
a42d985b BVA |
3199 | NULL, |
3200 | }; | |
3201 | ||
9ac8928e CH |
3202 | static const struct target_core_fabric_ops srpt_template = { |
3203 | .module = THIS_MODULE, | |
3204 | .name = "srpt", | |
a42d985b | 3205 | .get_fabric_name = srpt_get_fabric_name, |
a42d985b BVA |
3206 | .tpg_get_wwn = srpt_get_fabric_wwn, |
3207 | .tpg_get_tag = srpt_get_tag, | |
a42d985b BVA |
3208 | .tpg_check_demo_mode = srpt_check_false, |
3209 | .tpg_check_demo_mode_cache = srpt_check_true, | |
3210 | .tpg_check_demo_mode_write_protect = srpt_check_true, | |
3211 | .tpg_check_prod_mode_write_protect = srpt_check_false, | |
a42d985b BVA |
3212 | .tpg_get_inst_index = srpt_tpg_get_inst_index, |
3213 | .release_cmd = srpt_release_cmd, | |
3214 | .check_stop_free = srpt_check_stop_free, | |
a42d985b | 3215 | .close_session = srpt_close_session, |
a42d985b BVA |
3216 | .sess_get_index = srpt_sess_get_index, |
3217 | .sess_get_initiator_sid = NULL, | |
3218 | .write_pending = srpt_write_pending, | |
3219 | .write_pending_status = srpt_write_pending_status, | |
3220 | .set_default_node_attributes = srpt_set_default_node_attrs, | |
a42d985b | 3221 | .get_cmd_state = srpt_get_tcm_cmd_state, |
b79fafac | 3222 | .queue_data_in = srpt_queue_data_in, |
a42d985b | 3223 | .queue_status = srpt_queue_status, |
b79fafac | 3224 | .queue_tm_rsp = srpt_queue_tm_rsp, |
131e6abc | 3225 | .aborted_task = srpt_aborted_task, |
a42d985b BVA |
3226 | /* |
3227 | * Setup function pointers for generic logic in | |
3228 | * target_core_fabric_configfs.c | |
3229 | */ | |
3230 | .fabric_make_wwn = srpt_make_tport, | |
3231 | .fabric_drop_wwn = srpt_drop_tport, | |
3232 | .fabric_make_tpg = srpt_make_tpg, | |
3233 | .fabric_drop_tpg = srpt_drop_tpg, | |
c7d6a803 | 3234 | .fabric_init_nodeacl = srpt_init_nodeacl, |
9ac8928e CH |
3235 | |
3236 | .tfc_wwn_attrs = srpt_wwn_attrs, | |
3237 | .tfc_tpg_base_attrs = srpt_tpg_attrs, | |
3238 | .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs, | |
a42d985b BVA |
3239 | }; |
3240 | ||
3241 | /** | |
3242 | * srpt_init_module() - Kernel module initialization. | |
3243 | * | |
3244 | * Note: Since ib_register_client() registers callback functions, and since at | |
3245 | * least one of these callback functions (srpt_add_one()) calls target core | |
3246 | * functions, this driver must be registered with the target core before | |
3247 | * ib_register_client() is called. | |
3248 | */ | |
3249 | static int __init srpt_init_module(void) | |
3250 | { | |
3251 | int ret; | |
3252 | ||
3253 | ret = -EINVAL; | |
3254 | if (srp_max_req_size < MIN_MAX_REQ_SIZE) { | |
9f5d32af | 3255 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3256 | " srp_max_req_size -- must be at least %d.\n", |
3257 | srp_max_req_size, MIN_MAX_REQ_SIZE); | |
3258 | goto out; | |
3259 | } | |
3260 | ||
3261 | if (srpt_srq_size < MIN_SRPT_SRQ_SIZE | |
3262 | || srpt_srq_size > MAX_SRPT_SRQ_SIZE) { | |
9f5d32af | 3263 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3264 | " srpt_srq_size -- must be in the range [%d..%d].\n", |
3265 | srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE); | |
3266 | goto out; | |
3267 | } | |
3268 | ||
9ac8928e CH |
3269 | ret = target_register_template(&srpt_template); |
3270 | if (ret) | |
a42d985b | 3271 | goto out; |
a42d985b BVA |
3272 | |
3273 | ret = ib_register_client(&srpt_client); | |
3274 | if (ret) { | |
9f5d32af | 3275 | pr_err("couldn't register IB client\n"); |
a42d985b BVA |
3276 | goto out_unregister_target; |
3277 | } | |
3278 | ||
3279 | return 0; | |
3280 | ||
3281 | out_unregister_target: | |
9ac8928e | 3282 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3283 | out: |
3284 | return ret; | |
3285 | } | |
3286 | ||
3287 | static void __exit srpt_cleanup_module(void) | |
3288 | { | |
3289 | ib_unregister_client(&srpt_client); | |
9ac8928e | 3290 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3291 | } |
3292 | ||
3293 | module_init(srpt_init_module); | |
3294 | module_exit(srpt_cleanup_module); |