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a42d985b BVA |
1 | /* |
2 | * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved. | |
3 | * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>. | |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | * | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/err.h> | |
39 | #include <linux/ctype.h> | |
40 | #include <linux/kthread.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/delay.h> | |
43 | #include <linux/atomic.h> | |
63cf1a90 | 44 | #include <linux/inet.h> |
c5efb621 | 45 | #include <rdma/ib_cache.h> |
ba929992 | 46 | #include <scsi/scsi_proto.h> |
a42d985b | 47 | #include <scsi/scsi_tcq.h> |
a42d985b | 48 | #include <target/target_core_base.h> |
a42d985b | 49 | #include <target/target_core_fabric.h> |
a42d985b BVA |
50 | #include "ib_srpt.h" |
51 | ||
52 | /* Name of this kernel module. */ | |
53 | #define DRV_NAME "ib_srpt" | |
54 | #define DRV_VERSION "2.0.0" | |
55 | #define DRV_RELDATE "2011-02-14" | |
56 | ||
57 | #define SRPT_ID_STRING "Linux SRP target" | |
58 | ||
59 | #undef pr_fmt | |
60 | #define pr_fmt(fmt) DRV_NAME " " fmt | |
61 | ||
62 | MODULE_AUTHOR("Vu Pham and Bart Van Assche"); | |
63 | MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target " | |
64 | "v" DRV_VERSION " (" DRV_RELDATE ")"); | |
65 | MODULE_LICENSE("Dual BSD/GPL"); | |
66 | ||
67 | /* | |
68 | * Global Variables | |
69 | */ | |
70 | ||
71 | static u64 srpt_service_guid; | |
486d8b9f RD |
72 | static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */ |
73 | static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */ | |
a42d985b BVA |
74 | |
75 | static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE; | |
76 | module_param(srp_max_req_size, int, 0444); | |
77 | MODULE_PARM_DESC(srp_max_req_size, | |
78 | "Maximum size of SRP request messages in bytes."); | |
79 | ||
80 | static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE; | |
81 | module_param(srpt_srq_size, int, 0444); | |
82 | MODULE_PARM_DESC(srpt_srq_size, | |
83 | "Shared receive queue (SRQ) size."); | |
84 | ||
e4dca7b7 | 85 | static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp) |
a42d985b BVA |
86 | { |
87 | return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg); | |
88 | } | |
89 | module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid, | |
90 | 0444); | |
91 | MODULE_PARM_DESC(srpt_service_guid, | |
92 | "Using this value for ioc_guid, id_ext, and cm_listen_id" | |
93 | " instead of using the node_guid of the first HCA."); | |
94 | ||
95 | static struct ib_client srpt_client; | |
63cf1a90 BVA |
96 | /* Protects both rdma_cm_port and rdma_cm_id. */ |
97 | static DEFINE_MUTEX(rdma_cm_mutex); | |
98 | /* Port number RDMA/CM will bind to. */ | |
99 | static u16 rdma_cm_port; | |
100 | static struct rdma_cm_id *rdma_cm_id; | |
2c7f37ff | 101 | static void srpt_release_cmd(struct se_cmd *se_cmd); |
aaf45bd8 | 102 | static void srpt_free_ch(struct kref *kref); |
a42d985b | 103 | static int srpt_queue_status(struct se_cmd *cmd); |
59fae4de CH |
104 | static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc); |
105 | static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc); | |
387add46 | 106 | static void srpt_process_wait_list(struct srpt_rdma_ch *ch); |
a42d985b | 107 | |
f130c220 BVA |
108 | /* |
109 | * The only allowed channel state changes are those that change the channel | |
110 | * state into a state with a higher numerical value. Hence the new > prev test. | |
a42d985b | 111 | */ |
f130c220 | 112 | static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new) |
a42d985b BVA |
113 | { |
114 | unsigned long flags; | |
115 | enum rdma_ch_state prev; | |
f130c220 | 116 | bool changed = false; |
a42d985b BVA |
117 | |
118 | spin_lock_irqsave(&ch->spinlock, flags); | |
119 | prev = ch->state; | |
f130c220 | 120 | if (new > prev) { |
a42d985b | 121 | ch->state = new; |
f130c220 BVA |
122 | changed = true; |
123 | } | |
a42d985b | 124 | spin_unlock_irqrestore(&ch->spinlock, flags); |
f130c220 BVA |
125 | |
126 | return changed; | |
a42d985b BVA |
127 | } |
128 | ||
129 | /** | |
10eac19b BVA |
130 | * srpt_event_handler - asynchronous IB event callback function |
131 | * @handler: IB event handler registered by ib_register_event_handler(). | |
132 | * @event: Description of the event that occurred. | |
a42d985b BVA |
133 | * |
134 | * Callback function called by the InfiniBand core when an asynchronous IB | |
135 | * event occurs. This callback may occur in interrupt context. See also | |
136 | * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand | |
137 | * Architecture Specification. | |
138 | */ | |
139 | static void srpt_event_handler(struct ib_event_handler *handler, | |
140 | struct ib_event *event) | |
141 | { | |
142 | struct srpt_device *sdev; | |
143 | struct srpt_port *sport; | |
5f1141b1 | 144 | u8 port_num; |
a42d985b BVA |
145 | |
146 | sdev = ib_get_client_data(event->device, &srpt_client); | |
147 | if (!sdev || sdev->device != event->device) | |
148 | return; | |
149 | ||
150 | pr_debug("ASYNC event= %d on device= %s\n", event->event, | |
f68cba4e | 151 | sdev->device->name); |
a42d985b BVA |
152 | |
153 | switch (event->event) { | |
154 | case IB_EVENT_PORT_ERR: | |
5f1141b1 BVA |
155 | port_num = event->element.port_num - 1; |
156 | if (port_num < sdev->device->phys_port_cnt) { | |
157 | sport = &sdev->port[port_num]; | |
a42d985b BVA |
158 | sport->lid = 0; |
159 | sport->sm_lid = 0; | |
5f1141b1 BVA |
160 | } else { |
161 | WARN(true, "event %d: port_num %d out of range 1..%d\n", | |
162 | event->event, port_num + 1, | |
163 | sdev->device->phys_port_cnt); | |
a42d985b BVA |
164 | } |
165 | break; | |
166 | case IB_EVENT_PORT_ACTIVE: | |
167 | case IB_EVENT_LID_CHANGE: | |
168 | case IB_EVENT_PKEY_CHANGE: | |
169 | case IB_EVENT_SM_CHANGE: | |
170 | case IB_EVENT_CLIENT_REREGISTER: | |
2aa1cf64 | 171 | case IB_EVENT_GID_CHANGE: |
a42d985b | 172 | /* Refresh port data asynchronously. */ |
5f1141b1 BVA |
173 | port_num = event->element.port_num - 1; |
174 | if (port_num < sdev->device->phys_port_cnt) { | |
175 | sport = &sdev->port[port_num]; | |
a42d985b BVA |
176 | if (!sport->lid && !sport->sm_lid) |
177 | schedule_work(&sport->work); | |
5f1141b1 BVA |
178 | } else { |
179 | WARN(true, "event %d: port_num %d out of range 1..%d\n", | |
180 | event->event, port_num + 1, | |
181 | sdev->device->phys_port_cnt); | |
a42d985b BVA |
182 | } |
183 | break; | |
184 | default: | |
5f1141b1 | 185 | pr_err("received unrecognized IB event %d\n", event->event); |
a42d985b BVA |
186 | break; |
187 | } | |
188 | } | |
189 | ||
190 | /** | |
10eac19b BVA |
191 | * srpt_srq_event - SRQ event callback function |
192 | * @event: Description of the event that occurred. | |
193 | * @ctx: Context pointer specified at SRQ creation time. | |
a42d985b BVA |
194 | */ |
195 | static void srpt_srq_event(struct ib_event *event, void *ctx) | |
196 | { | |
d9f45ae6 | 197 | pr_debug("SRQ event %d\n", event->event); |
a42d985b BVA |
198 | } |
199 | ||
aaf45bd8 BVA |
200 | static const char *get_ch_state_name(enum rdma_ch_state s) |
201 | { | |
202 | switch (s) { | |
203 | case CH_CONNECTING: | |
204 | return "connecting"; | |
205 | case CH_LIVE: | |
206 | return "live"; | |
207 | case CH_DISCONNECTING: | |
208 | return "disconnecting"; | |
209 | case CH_DRAINING: | |
210 | return "draining"; | |
211 | case CH_DISCONNECTED: | |
212 | return "disconnected"; | |
213 | } | |
214 | return "???"; | |
215 | } | |
216 | ||
a42d985b | 217 | /** |
10eac19b BVA |
218 | * srpt_qp_event - QP event callback function |
219 | * @event: Description of the event that occurred. | |
220 | * @ch: SRPT RDMA channel. | |
a42d985b BVA |
221 | */ |
222 | static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch) | |
223 | { | |
090fa24b BVA |
224 | pr_debug("QP event %d on ch=%p sess_name=%s state=%d\n", |
225 | event->event, ch, ch->sess_name, ch->state); | |
a42d985b BVA |
226 | |
227 | switch (event->event) { | |
228 | case IB_EVENT_COMM_EST: | |
63cf1a90 BVA |
229 | if (ch->using_rdma_cm) |
230 | rdma_notify(ch->rdma_cm.cm_id, event->event); | |
231 | else | |
232 | ib_cm_notify(ch->ib_cm.cm_id, event->event); | |
a42d985b BVA |
233 | break; |
234 | case IB_EVENT_QP_LAST_WQE_REACHED: | |
aaf45bd8 BVA |
235 | pr_debug("%s-%d, state %s: received Last WQE event.\n", |
236 | ch->sess_name, ch->qp->qp_num, | |
237 | get_ch_state_name(ch->state)); | |
a42d985b BVA |
238 | break; |
239 | default: | |
9f5d32af | 240 | pr_err("received unrecognized IB QP event %d\n", event->event); |
a42d985b BVA |
241 | break; |
242 | } | |
243 | } | |
244 | ||
245 | /** | |
10eac19b BVA |
246 | * srpt_set_ioc - initialize a IOUnitInfo structure |
247 | * @c_list: controller list. | |
a42d985b BVA |
248 | * @slot: one-based slot number. |
249 | * @value: four-bit value. | |
250 | * | |
251 | * Copies the lowest four bits of value in element slot of the array of four | |
252 | * bit elements called c_list (controller list). The index slot is one-based. | |
253 | */ | |
254 | static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value) | |
255 | { | |
256 | u16 id; | |
257 | u8 tmp; | |
258 | ||
259 | id = (slot - 1) / 2; | |
260 | if (slot & 0x1) { | |
261 | tmp = c_list[id] & 0xf; | |
262 | c_list[id] = (value << 4) | tmp; | |
263 | } else { | |
264 | tmp = c_list[id] & 0xf0; | |
265 | c_list[id] = (value & 0xf) | tmp; | |
266 | } | |
267 | } | |
268 | ||
269 | /** | |
10eac19b BVA |
270 | * srpt_get_class_port_info - copy ClassPortInfo to a management datagram |
271 | * @mad: Datagram that will be sent as response to DM_ATTR_CLASS_PORT_INFO. | |
a42d985b BVA |
272 | * |
273 | * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture | |
274 | * Specification. | |
275 | */ | |
276 | static void srpt_get_class_port_info(struct ib_dm_mad *mad) | |
277 | { | |
278 | struct ib_class_port_info *cif; | |
279 | ||
280 | cif = (struct ib_class_port_info *)mad->data; | |
9d2aa2b4 | 281 | memset(cif, 0, sizeof(*cif)); |
a42d985b BVA |
282 | cif->base_version = 1; |
283 | cif->class_version = 1; | |
a42d985b | 284 | |
507f6afa | 285 | ib_set_cpi_resp_time(cif, 20); |
a42d985b BVA |
286 | mad->mad_hdr.status = 0; |
287 | } | |
288 | ||
289 | /** | |
10eac19b BVA |
290 | * srpt_get_iou - write IOUnitInfo to a management datagram |
291 | * @mad: Datagram that will be sent as response to DM_ATTR_IOU_INFO. | |
a42d985b BVA |
292 | * |
293 | * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture | |
294 | * Specification. See also section B.7, table B.6 in the SRP r16a document. | |
295 | */ | |
296 | static void srpt_get_iou(struct ib_dm_mad *mad) | |
297 | { | |
298 | struct ib_dm_iou_info *ioui; | |
299 | u8 slot; | |
300 | int i; | |
301 | ||
302 | ioui = (struct ib_dm_iou_info *)mad->data; | |
b356c1c1 | 303 | ioui->change_id = cpu_to_be16(1); |
a42d985b BVA |
304 | ioui->max_controllers = 16; |
305 | ||
306 | /* set present for slot 1 and empty for the rest */ | |
307 | srpt_set_ioc(ioui->controller_list, 1, 1); | |
308 | for (i = 1, slot = 2; i < 16; i++, slot++) | |
309 | srpt_set_ioc(ioui->controller_list, slot, 0); | |
310 | ||
311 | mad->mad_hdr.status = 0; | |
312 | } | |
313 | ||
314 | /** | |
10eac19b BVA |
315 | * srpt_get_ioc - write IOControllerprofile to a management datagram |
316 | * @sport: HCA port through which the MAD has been received. | |
317 | * @slot: Slot number specified in DM_ATTR_IOC_PROFILE query. | |
318 | * @mad: Datagram that will be sent as response to DM_ATTR_IOC_PROFILE. | |
a42d985b BVA |
319 | * |
320 | * See also section 16.3.3.4 IOControllerProfile in the InfiniBand | |
321 | * Architecture Specification. See also section B.7, table B.7 in the SRP | |
322 | * r16a document. | |
323 | */ | |
324 | static void srpt_get_ioc(struct srpt_port *sport, u32 slot, | |
325 | struct ib_dm_mad *mad) | |
326 | { | |
327 | struct srpt_device *sdev = sport->sdev; | |
328 | struct ib_dm_ioc_profile *iocp; | |
dea26209 | 329 | int send_queue_depth; |
a42d985b BVA |
330 | |
331 | iocp = (struct ib_dm_ioc_profile *)mad->data; | |
332 | ||
333 | if (!slot || slot > 16) { | |
334 | mad->mad_hdr.status | |
b356c1c1 | 335 | = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
a42d985b BVA |
336 | return; |
337 | } | |
338 | ||
339 | if (slot > 2) { | |
340 | mad->mad_hdr.status | |
b356c1c1 | 341 | = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
a42d985b BVA |
342 | return; |
343 | } | |
344 | ||
dea26209 BVA |
345 | if (sdev->use_srq) |
346 | send_queue_depth = sdev->srq_size; | |
347 | else | |
ed262287 | 348 | send_queue_depth = min(MAX_SRPT_RQ_SIZE, |
dea26209 BVA |
349 | sdev->device->attrs.max_qp_wr); |
350 | ||
9d2aa2b4 | 351 | memset(iocp, 0, sizeof(*iocp)); |
a42d985b BVA |
352 | strcpy(iocp->id_string, SRPT_ID_STRING); |
353 | iocp->guid = cpu_to_be64(srpt_service_guid); | |
4a061b28 OG |
354 | iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); |
355 | iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id); | |
356 | iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver); | |
357 | iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id); | |
a42d985b | 358 | iocp->subsys_device_id = 0x0; |
b356c1c1 VT |
359 | iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS); |
360 | iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS); | |
361 | iocp->protocol = cpu_to_be16(SRP_PROTOCOL); | |
362 | iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION); | |
dea26209 | 363 | iocp->send_queue_depth = cpu_to_be16(send_queue_depth); |
a42d985b BVA |
364 | iocp->rdma_read_depth = 4; |
365 | iocp->send_size = cpu_to_be32(srp_max_req_size); | |
366 | iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size, | |
367 | 1U << 24)); | |
368 | iocp->num_svc_entries = 1; | |
369 | iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC | | |
370 | SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC; | |
371 | ||
372 | mad->mad_hdr.status = 0; | |
373 | } | |
374 | ||
375 | /** | |
10eac19b BVA |
376 | * srpt_get_svc_entries - write ServiceEntries to a management datagram |
377 | * @ioc_guid: I/O controller GUID to use in reply. | |
378 | * @slot: I/O controller number. | |
379 | * @hi: End of the range of service entries to be specified in the reply. | |
380 | * @lo: Start of the range of service entries to be specified in the reply.. | |
381 | * @mad: Datagram that will be sent as response to DM_ATTR_SVC_ENTRIES. | |
a42d985b BVA |
382 | * |
383 | * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture | |
384 | * Specification. See also section B.7, table B.8 in the SRP r16a document. | |
385 | */ | |
386 | static void srpt_get_svc_entries(u64 ioc_guid, | |
387 | u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad) | |
388 | { | |
389 | struct ib_dm_svc_entries *svc_entries; | |
390 | ||
391 | WARN_ON(!ioc_guid); | |
392 | ||
393 | if (!slot || slot > 16) { | |
394 | mad->mad_hdr.status | |
b356c1c1 | 395 | = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD); |
a42d985b BVA |
396 | return; |
397 | } | |
398 | ||
399 | if (slot > 2 || lo > hi || hi > 1) { | |
400 | mad->mad_hdr.status | |
b356c1c1 | 401 | = cpu_to_be16(DM_MAD_STATUS_NO_IOC); |
a42d985b BVA |
402 | return; |
403 | } | |
404 | ||
405 | svc_entries = (struct ib_dm_svc_entries *)mad->data; | |
9d2aa2b4 | 406 | memset(svc_entries, 0, sizeof(*svc_entries)); |
a42d985b BVA |
407 | svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid); |
408 | snprintf(svc_entries->service_entries[0].name, | |
409 | sizeof(svc_entries->service_entries[0].name), | |
410 | "%s%016llx", | |
411 | SRP_SERVICE_NAME_PREFIX, | |
412 | ioc_guid); | |
413 | ||
414 | mad->mad_hdr.status = 0; | |
415 | } | |
416 | ||
417 | /** | |
10eac19b BVA |
418 | * srpt_mgmt_method_get - process a received management datagram |
419 | * @sp: HCA port through which the MAD has been received. | |
a42d985b BVA |
420 | * @rq_mad: received MAD. |
421 | * @rsp_mad: response MAD. | |
422 | */ | |
423 | static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad, | |
424 | struct ib_dm_mad *rsp_mad) | |
425 | { | |
426 | u16 attr_id; | |
427 | u32 slot; | |
428 | u8 hi, lo; | |
429 | ||
430 | attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id); | |
431 | switch (attr_id) { | |
432 | case DM_ATTR_CLASS_PORT_INFO: | |
433 | srpt_get_class_port_info(rsp_mad); | |
434 | break; | |
435 | case DM_ATTR_IOU_INFO: | |
436 | srpt_get_iou(rsp_mad); | |
437 | break; | |
438 | case DM_ATTR_IOC_PROFILE: | |
439 | slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); | |
440 | srpt_get_ioc(sp, slot, rsp_mad); | |
441 | break; | |
442 | case DM_ATTR_SVC_ENTRIES: | |
443 | slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod); | |
444 | hi = (u8) ((slot >> 8) & 0xff); | |
445 | lo = (u8) (slot & 0xff); | |
446 | slot = (u16) ((slot >> 16) & 0xffff); | |
447 | srpt_get_svc_entries(srpt_service_guid, | |
448 | slot, hi, lo, rsp_mad); | |
449 | break; | |
450 | default: | |
451 | rsp_mad->mad_hdr.status = | |
b356c1c1 | 452 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
a42d985b BVA |
453 | break; |
454 | } | |
455 | } | |
456 | ||
457 | /** | |
10eac19b BVA |
458 | * srpt_mad_send_handler - MAD send completion callback |
459 | * @mad_agent: Return value of ib_register_mad_agent(). | |
460 | * @mad_wc: Work completion reporting that the MAD has been sent. | |
a42d985b BVA |
461 | */ |
462 | static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent, | |
463 | struct ib_mad_send_wc *mad_wc) | |
464 | { | |
36523159 | 465 | rdma_destroy_ah(mad_wc->send_buf->ah); |
a42d985b BVA |
466 | ib_free_send_mad(mad_wc->send_buf); |
467 | } | |
468 | ||
469 | /** | |
10eac19b BVA |
470 | * srpt_mad_recv_handler - MAD reception callback function |
471 | * @mad_agent: Return value of ib_register_mad_agent(). | |
472 | * @send_buf: Not used. | |
473 | * @mad_wc: Work completion reporting that a MAD has been received. | |
a42d985b BVA |
474 | */ |
475 | static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent, | |
ca281265 | 476 | struct ib_mad_send_buf *send_buf, |
a42d985b BVA |
477 | struct ib_mad_recv_wc *mad_wc) |
478 | { | |
479 | struct srpt_port *sport = (struct srpt_port *)mad_agent->context; | |
480 | struct ib_ah *ah; | |
481 | struct ib_mad_send_buf *rsp; | |
482 | struct ib_dm_mad *dm_mad; | |
483 | ||
484 | if (!mad_wc || !mad_wc->recv_buf.mad) | |
485 | return; | |
486 | ||
487 | ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc, | |
488 | mad_wc->recv_buf.grh, mad_agent->port_num); | |
489 | if (IS_ERR(ah)) | |
490 | goto err; | |
491 | ||
492 | BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR); | |
493 | ||
494 | rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp, | |
495 | mad_wc->wc->pkey_index, 0, | |
496 | IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA, | |
da2dfaa3 IW |
497 | GFP_KERNEL, |
498 | IB_MGMT_BASE_VERSION); | |
a42d985b BVA |
499 | if (IS_ERR(rsp)) |
500 | goto err_rsp; | |
501 | ||
502 | rsp->ah = ah; | |
503 | ||
504 | dm_mad = rsp->mad; | |
9d2aa2b4 | 505 | memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad)); |
a42d985b BVA |
506 | dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP; |
507 | dm_mad->mad_hdr.status = 0; | |
508 | ||
509 | switch (mad_wc->recv_buf.mad->mad_hdr.method) { | |
510 | case IB_MGMT_METHOD_GET: | |
511 | srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad); | |
512 | break; | |
513 | case IB_MGMT_METHOD_SET: | |
514 | dm_mad->mad_hdr.status = | |
b356c1c1 | 515 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR); |
a42d985b BVA |
516 | break; |
517 | default: | |
518 | dm_mad->mad_hdr.status = | |
b356c1c1 | 519 | cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD); |
a42d985b BVA |
520 | break; |
521 | } | |
522 | ||
523 | if (!ib_post_send_mad(rsp, NULL)) { | |
524 | ib_free_recv_mad(mad_wc); | |
525 | /* will destroy_ah & free_send_mad in send completion */ | |
526 | return; | |
527 | } | |
528 | ||
529 | ib_free_send_mad(rsp); | |
530 | ||
531 | err_rsp: | |
36523159 | 532 | rdma_destroy_ah(ah); |
a42d985b BVA |
533 | err: |
534 | ib_free_recv_mad(mad_wc); | |
535 | } | |
536 | ||
b14cb744 BVA |
537 | static int srpt_format_guid(char *buf, unsigned int size, const __be64 *guid) |
538 | { | |
539 | const __be16 *g = (const __be16 *)guid; | |
540 | ||
541 | return snprintf(buf, size, "%04x:%04x:%04x:%04x", | |
542 | be16_to_cpu(g[0]), be16_to_cpu(g[1]), | |
543 | be16_to_cpu(g[2]), be16_to_cpu(g[3])); | |
544 | } | |
545 | ||
a42d985b | 546 | /** |
10eac19b BVA |
547 | * srpt_refresh_port - configure a HCA port |
548 | * @sport: SRPT HCA port. | |
a42d985b BVA |
549 | * |
550 | * Enable InfiniBand management datagram processing, update the cached sm_lid, | |
551 | * lid and gid values, and register a callback function for processing MADs | |
552 | * on the specified port. | |
553 | * | |
554 | * Note: It is safe to call this function more than once for the same port. | |
555 | */ | |
556 | static int srpt_refresh_port(struct srpt_port *sport) | |
557 | { | |
558 | struct ib_mad_reg_req reg_req; | |
559 | struct ib_port_modify port_modify; | |
560 | struct ib_port_attr port_attr; | |
561 | int ret; | |
562 | ||
9d2aa2b4 | 563 | memset(&port_modify, 0, sizeof(port_modify)); |
a42d985b BVA |
564 | port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; |
565 | port_modify.clr_port_cap_mask = 0; | |
566 | ||
567 | ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
568 | if (ret) | |
569 | goto err_mod_port; | |
570 | ||
571 | ret = ib_query_port(sport->sdev->device, sport->port, &port_attr); | |
572 | if (ret) | |
573 | goto err_query_port; | |
574 | ||
575 | sport->sm_lid = port_attr.sm_lid; | |
576 | sport->lid = port_attr.lid; | |
577 | ||
1dfce294 | 578 | ret = rdma_query_gid(sport->sdev->device, sport->port, 0, &sport->gid); |
a42d985b BVA |
579 | if (ret) |
580 | goto err_query_port; | |
581 | ||
2bce1a6d | 582 | sport->port_guid_wwn.priv = sport; |
b14cb744 BVA |
583 | srpt_format_guid(sport->port_guid, sizeof(sport->port_guid), |
584 | &sport->gid.global.interface_id); | |
2bce1a6d BVA |
585 | sport->port_gid_wwn.priv = sport; |
586 | snprintf(sport->port_gid, sizeof(sport->port_gid), | |
587 | "0x%016llx%016llx", | |
588 | be64_to_cpu(sport->gid.global.subnet_prefix), | |
589 | be64_to_cpu(sport->gid.global.interface_id)); | |
716b076b | 590 | |
a42d985b | 591 | if (!sport->mad_agent) { |
9d2aa2b4 | 592 | memset(®_req, 0, sizeof(reg_req)); |
a42d985b BVA |
593 | reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT; |
594 | reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION; | |
595 | set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask); | |
596 | set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask); | |
597 | ||
598 | sport->mad_agent = ib_register_mad_agent(sport->sdev->device, | |
599 | sport->port, | |
600 | IB_QPT_GSI, | |
601 | ®_req, 0, | |
602 | srpt_mad_send_handler, | |
603 | srpt_mad_recv_handler, | |
0f29b46d | 604 | sport, 0); |
a42d985b BVA |
605 | if (IS_ERR(sport->mad_agent)) { |
606 | ret = PTR_ERR(sport->mad_agent); | |
607 | sport->mad_agent = NULL; | |
608 | goto err_query_port; | |
609 | } | |
610 | } | |
611 | ||
612 | return 0; | |
613 | ||
614 | err_query_port: | |
615 | ||
616 | port_modify.set_port_cap_mask = 0; | |
617 | port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; | |
618 | ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
619 | ||
620 | err_mod_port: | |
621 | ||
622 | return ret; | |
623 | } | |
624 | ||
625 | /** | |
10eac19b BVA |
626 | * srpt_unregister_mad_agent - unregister MAD callback functions |
627 | * @sdev: SRPT HCA pointer. | |
a42d985b BVA |
628 | * |
629 | * Note: It is safe to call this function more than once for the same device. | |
630 | */ | |
631 | static void srpt_unregister_mad_agent(struct srpt_device *sdev) | |
632 | { | |
633 | struct ib_port_modify port_modify = { | |
634 | .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP, | |
635 | }; | |
636 | struct srpt_port *sport; | |
637 | int i; | |
638 | ||
639 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
640 | sport = &sdev->port[i - 1]; | |
641 | WARN_ON(sport->port != i); | |
642 | if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0) | |
9f5d32af | 643 | pr_err("disabling MAD processing failed.\n"); |
a42d985b BVA |
644 | if (sport->mad_agent) { |
645 | ib_unregister_mad_agent(sport->mad_agent); | |
646 | sport->mad_agent = NULL; | |
647 | } | |
648 | } | |
649 | } | |
650 | ||
651 | /** | |
10eac19b BVA |
652 | * srpt_alloc_ioctx - allocate a SRPT I/O context structure |
653 | * @sdev: SRPT HCA pointer. | |
654 | * @ioctx_size: I/O context size. | |
655 | * @dma_size: Size of I/O context DMA buffer. | |
656 | * @dir: DMA data direction. | |
a42d985b BVA |
657 | */ |
658 | static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev, | |
659 | int ioctx_size, int dma_size, | |
660 | enum dma_data_direction dir) | |
661 | { | |
662 | struct srpt_ioctx *ioctx; | |
663 | ||
664 | ioctx = kmalloc(ioctx_size, GFP_KERNEL); | |
665 | if (!ioctx) | |
666 | goto err; | |
667 | ||
668 | ioctx->buf = kmalloc(dma_size, GFP_KERNEL); | |
669 | if (!ioctx->buf) | |
670 | goto err_free_ioctx; | |
671 | ||
672 | ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir); | |
673 | if (ib_dma_mapping_error(sdev->device, ioctx->dma)) | |
674 | goto err_free_buf; | |
675 | ||
676 | return ioctx; | |
677 | ||
678 | err_free_buf: | |
679 | kfree(ioctx->buf); | |
680 | err_free_ioctx: | |
681 | kfree(ioctx); | |
682 | err: | |
683 | return NULL; | |
684 | } | |
685 | ||
686 | /** | |
10eac19b BVA |
687 | * srpt_free_ioctx - free a SRPT I/O context structure |
688 | * @sdev: SRPT HCA pointer. | |
689 | * @ioctx: I/O context pointer. | |
690 | * @dma_size: Size of I/O context DMA buffer. | |
691 | * @dir: DMA data direction. | |
a42d985b BVA |
692 | */ |
693 | static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx, | |
694 | int dma_size, enum dma_data_direction dir) | |
695 | { | |
696 | if (!ioctx) | |
697 | return; | |
698 | ||
699 | ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir); | |
700 | kfree(ioctx->buf); | |
701 | kfree(ioctx); | |
702 | } | |
703 | ||
704 | /** | |
10eac19b | 705 | * srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures |
a42d985b BVA |
706 | * @sdev: Device to allocate the I/O context ring for. |
707 | * @ring_size: Number of elements in the I/O context ring. | |
708 | * @ioctx_size: I/O context size. | |
709 | * @dma_size: DMA buffer size. | |
710 | * @dir: DMA data direction. | |
711 | */ | |
712 | static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev, | |
713 | int ring_size, int ioctx_size, | |
714 | int dma_size, enum dma_data_direction dir) | |
715 | { | |
716 | struct srpt_ioctx **ring; | |
717 | int i; | |
718 | ||
719 | WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) | |
720 | && ioctx_size != sizeof(struct srpt_send_ioctx)); | |
721 | ||
781a4016 | 722 | ring = kvmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL); |
a42d985b BVA |
723 | if (!ring) |
724 | goto out; | |
725 | for (i = 0; i < ring_size; ++i) { | |
726 | ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir); | |
727 | if (!ring[i]) | |
728 | goto err; | |
729 | ring[i]->index = i; | |
730 | } | |
731 | goto out; | |
732 | ||
733 | err: | |
734 | while (--i >= 0) | |
735 | srpt_free_ioctx(sdev, ring[i], dma_size, dir); | |
781a4016 | 736 | kvfree(ring); |
715252d4 | 737 | ring = NULL; |
a42d985b BVA |
738 | out: |
739 | return ring; | |
740 | } | |
741 | ||
742 | /** | |
10eac19b BVA |
743 | * srpt_free_ioctx_ring - free the ring of SRPT I/O context structures |
744 | * @ioctx_ring: I/O context ring to be freed. | |
745 | * @sdev: SRPT HCA pointer. | |
746 | * @ring_size: Number of ring elements. | |
747 | * @dma_size: Size of I/O context DMA buffer. | |
748 | * @dir: DMA data direction. | |
a42d985b BVA |
749 | */ |
750 | static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring, | |
751 | struct srpt_device *sdev, int ring_size, | |
752 | int dma_size, enum dma_data_direction dir) | |
753 | { | |
754 | int i; | |
755 | ||
dea26209 BVA |
756 | if (!ioctx_ring) |
757 | return; | |
758 | ||
a42d985b BVA |
759 | for (i = 0; i < ring_size; ++i) |
760 | srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir); | |
781a4016 | 761 | kvfree(ioctx_ring); |
a42d985b BVA |
762 | } |
763 | ||
a42d985b | 764 | /** |
10eac19b BVA |
765 | * srpt_set_cmd_state - set the state of a SCSI command |
766 | * @ioctx: Send I/O context. | |
767 | * @new: New I/O context state. | |
a42d985b BVA |
768 | * |
769 | * Does not modify the state of aborted commands. Returns the previous command | |
770 | * state. | |
771 | */ | |
772 | static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
773 | enum srpt_command_state new) | |
774 | { | |
775 | enum srpt_command_state previous; | |
a42d985b | 776 | |
a42d985b BVA |
777 | previous = ioctx->state; |
778 | if (previous != SRPT_STATE_DONE) | |
779 | ioctx->state = new; | |
a42d985b BVA |
780 | |
781 | return previous; | |
782 | } | |
783 | ||
784 | /** | |
10eac19b BVA |
785 | * srpt_test_and_set_cmd_state - test and set the state of a command |
786 | * @ioctx: Send I/O context. | |
787 | * @old: Current I/O context state. | |
788 | * @new: New I/O context state. | |
a42d985b BVA |
789 | * |
790 | * Returns true if and only if the previous command state was equal to 'old'. | |
791 | */ | |
792 | static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
793 | enum srpt_command_state old, | |
794 | enum srpt_command_state new) | |
795 | { | |
796 | enum srpt_command_state previous; | |
a42d985b BVA |
797 | |
798 | WARN_ON(!ioctx); | |
799 | WARN_ON(old == SRPT_STATE_DONE); | |
800 | WARN_ON(new == SRPT_STATE_NEW); | |
801 | ||
a42d985b BVA |
802 | previous = ioctx->state; |
803 | if (previous == old) | |
804 | ioctx->state = new; | |
2d67017c | 805 | |
a42d985b BVA |
806 | return previous == old; |
807 | } | |
808 | ||
809 | /** | |
10eac19b BVA |
810 | * srpt_post_recv - post an IB receive request |
811 | * @sdev: SRPT HCA pointer. | |
812 | * @ch: SRPT RDMA channel. | |
813 | * @ioctx: Receive I/O context pointer. | |
a42d985b | 814 | */ |
dea26209 | 815 | static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch, |
a42d985b BVA |
816 | struct srpt_recv_ioctx *ioctx) |
817 | { | |
818 | struct ib_sge list; | |
9b32a596 | 819 | struct ib_recv_wr wr; |
a42d985b BVA |
820 | |
821 | BUG_ON(!sdev); | |
a42d985b BVA |
822 | list.addr = ioctx->ioctx.dma; |
823 | list.length = srp_max_req_size; | |
74333f12 | 824 | list.lkey = sdev->lkey; |
a42d985b | 825 | |
59fae4de CH |
826 | ioctx->ioctx.cqe.done = srpt_recv_done; |
827 | wr.wr_cqe = &ioctx->ioctx.cqe; | |
a42d985b BVA |
828 | wr.next = NULL; |
829 | wr.sg_list = &list; | |
830 | wr.num_sge = 1; | |
831 | ||
dea26209 | 832 | if (sdev->use_srq) |
9b32a596 | 833 | return ib_post_srq_recv(sdev->srq, &wr, NULL); |
dea26209 | 834 | else |
9b32a596 | 835 | return ib_post_recv(ch->qp, &wr, NULL); |
a42d985b BVA |
836 | } |
837 | ||
aaf45bd8 | 838 | /** |
10eac19b BVA |
839 | * srpt_zerolength_write - perform a zero-length RDMA write |
840 | * @ch: SRPT RDMA channel. | |
aaf45bd8 BVA |
841 | * |
842 | * A quote from the InfiniBand specification: C9-88: For an HCA responder | |
843 | * using Reliable Connection service, for each zero-length RDMA READ or WRITE | |
844 | * request, the R_Key shall not be validated, even if the request includes | |
845 | * Immediate data. | |
846 | */ | |
847 | static int srpt_zerolength_write(struct srpt_rdma_ch *ch) | |
848 | { | |
2a78cb4d BVA |
849 | struct ib_rdma_wr wr = { |
850 | .wr = { | |
06892cc1 AM |
851 | .next = NULL, |
852 | { .wr_cqe = &ch->zw_cqe, }, | |
2a78cb4d | 853 | .opcode = IB_WR_RDMA_WRITE, |
2a78cb4d BVA |
854 | .send_flags = IB_SEND_SIGNALED, |
855 | } | |
856 | }; | |
aaf45bd8 | 857 | |
63d370a6 BVA |
858 | pr_debug("%s-%d: queued zerolength write\n", ch->sess_name, |
859 | ch->qp->qp_num); | |
860 | ||
9b32a596 | 861 | return ib_post_send(ch->qp, &wr.wr, NULL); |
aaf45bd8 BVA |
862 | } |
863 | ||
864 | static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc) | |
865 | { | |
866 | struct srpt_rdma_ch *ch = cq->cq_context; | |
867 | ||
63d370a6 BVA |
868 | pr_debug("%s-%d wc->status %d\n", ch->sess_name, ch->qp->qp_num, |
869 | wc->status); | |
870 | ||
387add46 BVA |
871 | if (wc->status == IB_WC_SUCCESS) { |
872 | srpt_process_wait_list(ch); | |
873 | } else { | |
874 | if (srpt_set_ch_state(ch, CH_DISCONNECTED)) | |
875 | schedule_work(&ch->release_work); | |
876 | else | |
ea51d2e1 BVA |
877 | pr_debug("%s-%d: already disconnected.\n", |
878 | ch->sess_name, ch->qp->qp_num); | |
387add46 | 879 | } |
aaf45bd8 BVA |
880 | } |
881 | ||
b99f8e4d CH |
882 | static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx, |
883 | struct srp_direct_buf *db, int nbufs, struct scatterlist **sg, | |
884 | unsigned *sg_cnt) | |
885 | { | |
886 | enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd); | |
887 | struct srpt_rdma_ch *ch = ioctx->ch; | |
888 | struct scatterlist *prev = NULL; | |
889 | unsigned prev_nents; | |
890 | int ret, i; | |
891 | ||
892 | if (nbufs == 1) { | |
893 | ioctx->rw_ctxs = &ioctx->s_rw_ctx; | |
894 | } else { | |
895 | ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs), | |
896 | GFP_KERNEL); | |
897 | if (!ioctx->rw_ctxs) | |
898 | return -ENOMEM; | |
899 | } | |
900 | ||
901 | for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) { | |
902 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
903 | u64 remote_addr = be64_to_cpu(db->va); | |
904 | u32 size = be32_to_cpu(db->len); | |
905 | u32 rkey = be32_to_cpu(db->key); | |
906 | ||
907 | ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false, | |
908 | i < nbufs - 1); | |
909 | if (ret) | |
910 | goto unwind; | |
911 | ||
912 | ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port, | |
913 | ctx->sg, ctx->nents, 0, remote_addr, rkey, dir); | |
914 | if (ret < 0) { | |
915 | target_free_sgl(ctx->sg, ctx->nents); | |
916 | goto unwind; | |
917 | } | |
918 | ||
919 | ioctx->n_rdma += ret; | |
920 | ioctx->n_rw_ctx++; | |
921 | ||
922 | if (prev) { | |
923 | sg_unmark_end(&prev[prev_nents - 1]); | |
924 | sg_chain(prev, prev_nents + 1, ctx->sg); | |
925 | } else { | |
926 | *sg = ctx->sg; | |
927 | } | |
928 | ||
929 | prev = ctx->sg; | |
930 | prev_nents = ctx->nents; | |
931 | ||
932 | *sg_cnt += ctx->nents; | |
933 | } | |
934 | ||
935 | return 0; | |
936 | ||
937 | unwind: | |
938 | while (--i >= 0) { | |
939 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
940 | ||
941 | rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port, | |
942 | ctx->sg, ctx->nents, dir); | |
943 | target_free_sgl(ctx->sg, ctx->nents); | |
944 | } | |
945 | if (ioctx->rw_ctxs != &ioctx->s_rw_ctx) | |
946 | kfree(ioctx->rw_ctxs); | |
947 | return ret; | |
948 | } | |
949 | ||
950 | static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch, | |
951 | struct srpt_send_ioctx *ioctx) | |
952 | { | |
953 | enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd); | |
954 | int i; | |
955 | ||
956 | for (i = 0; i < ioctx->n_rw_ctx; i++) { | |
957 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
958 | ||
959 | rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port, | |
960 | ctx->sg, ctx->nents, dir); | |
961 | target_free_sgl(ctx->sg, ctx->nents); | |
962 | } | |
963 | ||
964 | if (ioctx->rw_ctxs != &ioctx->s_rw_ctx) | |
965 | kfree(ioctx->rw_ctxs); | |
966 | } | |
967 | ||
968 | static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd) | |
969 | { | |
970 | /* | |
971 | * The pointer computations below will only be compiled correctly | |
972 | * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check | |
973 | * whether srp_cmd::add_data has been declared as a byte pointer. | |
974 | */ | |
975 | BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) && | |
976 | !__same_type(srp_cmd->add_data[0], (u8)0)); | |
977 | ||
978 | /* | |
979 | * According to the SRP spec, the lower two bits of the 'ADDITIONAL | |
980 | * CDB LENGTH' field are reserved and the size in bytes of this field | |
981 | * is four times the value specified in bits 3..7. Hence the "& ~3". | |
982 | */ | |
983 | return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3); | |
984 | } | |
985 | ||
a42d985b | 986 | /** |
10eac19b | 987 | * srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request |
a42d985b BVA |
988 | * @ioctx: Pointer to the I/O context associated with the request. |
989 | * @srp_cmd: Pointer to the SRP_CMD request data. | |
990 | * @dir: Pointer to the variable to which the transfer direction will be | |
991 | * written. | |
10eac19b BVA |
992 | * @sg: [out] scatterlist allocated for the parsed SRP_CMD. |
993 | * @sg_cnt: [out] length of @sg. | |
a42d985b BVA |
994 | * @data_len: Pointer to the variable to which the total data length of all |
995 | * descriptors in the SRP_CMD request will be written. | |
996 | * | |
997 | * This function initializes ioctx->nrbuf and ioctx->r_bufs. | |
998 | * | |
999 | * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors; | |
1000 | * -ENOMEM when memory allocation fails and zero upon success. | |
1001 | */ | |
1002 | static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx, | |
b99f8e4d CH |
1003 | struct srp_cmd *srp_cmd, enum dma_data_direction *dir, |
1004 | struct scatterlist **sg, unsigned *sg_cnt, u64 *data_len) | |
a42d985b | 1005 | { |
a42d985b BVA |
1006 | BUG_ON(!dir); |
1007 | BUG_ON(!data_len); | |
1008 | ||
a42d985b BVA |
1009 | /* |
1010 | * The lower four bits of the buffer format field contain the DATA-IN | |
1011 | * buffer descriptor format, and the highest four bits contain the | |
1012 | * DATA-OUT buffer descriptor format. | |
1013 | */ | |
a42d985b BVA |
1014 | if (srp_cmd->buf_fmt & 0xf) |
1015 | /* DATA-IN: transfer data from target to initiator (read). */ | |
1016 | *dir = DMA_FROM_DEVICE; | |
1017 | else if (srp_cmd->buf_fmt >> 4) | |
1018 | /* DATA-OUT: transfer data from initiator to target (write). */ | |
1019 | *dir = DMA_TO_DEVICE; | |
b99f8e4d CH |
1020 | else |
1021 | *dir = DMA_NONE; | |
1022 | ||
1023 | /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */ | |
1024 | ioctx->cmd.data_direction = *dir; | |
a42d985b | 1025 | |
a42d985b BVA |
1026 | if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) || |
1027 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) { | |
b99f8e4d | 1028 | struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd); |
a42d985b | 1029 | |
a42d985b | 1030 | *data_len = be32_to_cpu(db->len); |
b99f8e4d | 1031 | return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt); |
a42d985b BVA |
1032 | } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) || |
1033 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) { | |
b99f8e4d CH |
1034 | struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd); |
1035 | int nbufs = be32_to_cpu(idb->table_desc.len) / | |
1036 | sizeof(struct srp_direct_buf); | |
a42d985b | 1037 | |
b99f8e4d | 1038 | if (nbufs > |
a42d985b | 1039 | (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) { |
9f5d32af | 1040 | pr_err("received unsupported SRP_CMD request" |
a42d985b BVA |
1041 | " type (%u out + %u in != %u / %zu)\n", |
1042 | srp_cmd->data_out_desc_cnt, | |
1043 | srp_cmd->data_in_desc_cnt, | |
1044 | be32_to_cpu(idb->table_desc.len), | |
b99f8e4d CH |
1045 | sizeof(struct srp_direct_buf)); |
1046 | return -EINVAL; | |
a42d985b BVA |
1047 | } |
1048 | ||
a42d985b | 1049 | *data_len = be32_to_cpu(idb->len); |
b99f8e4d CH |
1050 | return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs, |
1051 | sg, sg_cnt); | |
1052 | } else { | |
1053 | *data_len = 0; | |
1054 | return 0; | |
a42d985b | 1055 | } |
a42d985b BVA |
1056 | } |
1057 | ||
1058 | /** | |
10eac19b BVA |
1059 | * srpt_init_ch_qp - initialize queue pair attributes |
1060 | * @ch: SRPT RDMA channel. | |
1061 | * @qp: Queue pair pointer. | |
a42d985b BVA |
1062 | * |
1063 | * Initialized the attributes of queue pair 'qp' by allowing local write, | |
1064 | * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT. | |
1065 | */ | |
1066 | static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1067 | { | |
1068 | struct ib_qp_attr *attr; | |
1069 | int ret; | |
1070 | ||
63cf1a90 BVA |
1071 | WARN_ON_ONCE(ch->using_rdma_cm); |
1072 | ||
9d2aa2b4 | 1073 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
a42d985b BVA |
1074 | if (!attr) |
1075 | return -ENOMEM; | |
1076 | ||
1077 | attr->qp_state = IB_QPS_INIT; | |
bec40c26 | 1078 | attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE; |
a42d985b | 1079 | attr->port_num = ch->sport->port; |
c5efb621 BVA |
1080 | |
1081 | ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port, | |
1082 | ch->pkey, &attr->pkey_index); | |
1083 | if (ret < 0) | |
1084 | pr_err("Translating pkey %#x failed (%d) - using index 0\n", | |
1085 | ch->pkey, ret); | |
a42d985b BVA |
1086 | |
1087 | ret = ib_modify_qp(qp, attr, | |
1088 | IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT | | |
1089 | IB_QP_PKEY_INDEX); | |
1090 | ||
1091 | kfree(attr); | |
1092 | return ret; | |
1093 | } | |
1094 | ||
1095 | /** | |
10eac19b | 1096 | * srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR) |
a42d985b BVA |
1097 | * @ch: channel of the queue pair. |
1098 | * @qp: queue pair to change the state of. | |
1099 | * | |
1100 | * Returns zero upon success and a negative value upon failure. | |
1101 | * | |
1102 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
1103 | * If this structure ever becomes larger, it might be necessary to allocate | |
1104 | * it dynamically instead of on the stack. | |
1105 | */ | |
1106 | static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1107 | { | |
1108 | struct ib_qp_attr qp_attr; | |
1109 | int attr_mask; | |
1110 | int ret; | |
1111 | ||
63cf1a90 BVA |
1112 | WARN_ON_ONCE(ch->using_rdma_cm); |
1113 | ||
a42d985b | 1114 | qp_attr.qp_state = IB_QPS_RTR; |
090fa24b | 1115 | ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask); |
a42d985b BVA |
1116 | if (ret) |
1117 | goto out; | |
1118 | ||
1119 | qp_attr.max_dest_rd_atomic = 4; | |
1120 | ||
1121 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
1122 | ||
1123 | out: | |
1124 | return ret; | |
1125 | } | |
1126 | ||
1127 | /** | |
10eac19b | 1128 | * srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS) |
a42d985b BVA |
1129 | * @ch: channel of the queue pair. |
1130 | * @qp: queue pair to change the state of. | |
1131 | * | |
1132 | * Returns zero upon success and a negative value upon failure. | |
1133 | * | |
1134 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
1135 | * If this structure ever becomes larger, it might be necessary to allocate | |
1136 | * it dynamically instead of on the stack. | |
1137 | */ | |
1138 | static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1139 | { | |
1140 | struct ib_qp_attr qp_attr; | |
1141 | int attr_mask; | |
1142 | int ret; | |
1143 | ||
1144 | qp_attr.qp_state = IB_QPS_RTS; | |
090fa24b | 1145 | ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask); |
a42d985b BVA |
1146 | if (ret) |
1147 | goto out; | |
1148 | ||
1149 | qp_attr.max_rd_atomic = 4; | |
1150 | ||
1151 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
1152 | ||
1153 | out: | |
1154 | return ret; | |
1155 | } | |
1156 | ||
1157 | /** | |
10eac19b BVA |
1158 | * srpt_ch_qp_err - set the channel queue pair state to 'error' |
1159 | * @ch: SRPT RDMA channel. | |
a42d985b BVA |
1160 | */ |
1161 | static int srpt_ch_qp_err(struct srpt_rdma_ch *ch) | |
1162 | { | |
1163 | struct ib_qp_attr qp_attr; | |
1164 | ||
1165 | qp_attr.qp_state = IB_QPS_ERR; | |
1166 | return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE); | |
1167 | } | |
1168 | ||
a42d985b | 1169 | /** |
10eac19b BVA |
1170 | * srpt_get_send_ioctx - obtain an I/O context for sending to the initiator |
1171 | * @ch: SRPT RDMA channel. | |
a42d985b BVA |
1172 | */ |
1173 | static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch) | |
1174 | { | |
1175 | struct srpt_send_ioctx *ioctx; | |
3c968887 | 1176 | unsigned long flags; |
a42d985b BVA |
1177 | |
1178 | BUG_ON(!ch); | |
1179 | ||
3c968887 BVA |
1180 | ioctx = NULL; |
1181 | spin_lock_irqsave(&ch->spinlock, flags); | |
1182 | if (!list_empty(&ch->free_list)) { | |
1183 | ioctx = list_first_entry(&ch->free_list, | |
1184 | struct srpt_send_ioctx, free_list); | |
1185 | list_del(&ioctx->free_list); | |
a42d985b | 1186 | } |
3c968887 BVA |
1187 | spin_unlock_irqrestore(&ch->spinlock, flags); |
1188 | ||
1189 | if (!ioctx) | |
1190 | return ioctx; | |
1191 | ||
1192 | BUG_ON(ioctx->ch != ch); | |
a42d985b | 1193 | ioctx->state = SRPT_STATE_NEW; |
3c968887 | 1194 | ioctx->n_rdma = 0; |
b99f8e4d | 1195 | ioctx->n_rw_ctx = 0; |
3c968887 BVA |
1196 | ioctx->queue_status_only = false; |
1197 | /* | |
1198 | * transport_init_se_cmd() does not initialize all fields, so do it | |
1199 | * here. | |
1200 | */ | |
1201 | memset(&ioctx->cmd, 0, sizeof(ioctx->cmd)); | |
1202 | memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data)); | |
a42d985b BVA |
1203 | |
1204 | return ioctx; | |
1205 | } | |
1206 | ||
a42d985b | 1207 | /** |
10eac19b | 1208 | * srpt_abort_cmd - abort a SCSI command |
a42d985b | 1209 | * @ioctx: I/O context associated with the SCSI command. |
a42d985b BVA |
1210 | */ |
1211 | static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx) | |
1212 | { | |
1213 | enum srpt_command_state state; | |
a42d985b BVA |
1214 | |
1215 | BUG_ON(!ioctx); | |
1216 | ||
1217 | /* | |
1218 | * If the command is in a state where the target core is waiting for | |
49f40163 | 1219 | * the ib_srpt driver, change the state to the next state. |
a42d985b BVA |
1220 | */ |
1221 | ||
a42d985b BVA |
1222 | state = ioctx->state; |
1223 | switch (state) { | |
1224 | case SRPT_STATE_NEED_DATA: | |
1225 | ioctx->state = SRPT_STATE_DATA_IN; | |
1226 | break; | |
a42d985b BVA |
1227 | case SRPT_STATE_CMD_RSP_SENT: |
1228 | case SRPT_STATE_MGMT_RSP_SENT: | |
1229 | ioctx->state = SRPT_STATE_DONE; | |
1230 | break; | |
1231 | default: | |
49f40163 BVA |
1232 | WARN_ONCE(true, "%s: unexpected I/O context state %d\n", |
1233 | __func__, state); | |
a42d985b BVA |
1234 | break; |
1235 | } | |
a42d985b | 1236 | |
13fdd445 BVA |
1237 | pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state, |
1238 | ioctx->state, ioctx->cmd.tag); | |
a42d985b BVA |
1239 | |
1240 | switch (state) { | |
1241 | case SRPT_STATE_NEW: | |
1242 | case SRPT_STATE_DATA_IN: | |
1243 | case SRPT_STATE_MGMT: | |
49f40163 | 1244 | case SRPT_STATE_DONE: |
a42d985b BVA |
1245 | /* |
1246 | * Do nothing - defer abort processing until | |
1247 | * srpt_queue_response() is invoked. | |
1248 | */ | |
a42d985b BVA |
1249 | break; |
1250 | case SRPT_STATE_NEED_DATA: | |
49f40163 BVA |
1251 | pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag); |
1252 | transport_generic_request_failure(&ioctx->cmd, | |
1253 | TCM_CHECK_CONDITION_ABORT_CMD); | |
a42d985b BVA |
1254 | break; |
1255 | case SRPT_STATE_CMD_RSP_SENT: | |
1256 | /* | |
1257 | * SRP_RSP sending failed or the SRP_RSP send completion has | |
1258 | * not been received in time. | |
1259 | */ | |
49f40163 | 1260 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1261 | break; |
1262 | case SRPT_STATE_MGMT_RSP_SENT: | |
49f40163 | 1263 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1264 | break; |
1265 | default: | |
532ec6f1 | 1266 | WARN(1, "Unexpected command state (%d)", state); |
a42d985b BVA |
1267 | break; |
1268 | } | |
1269 | ||
a42d985b BVA |
1270 | return state; |
1271 | } | |
1272 | ||
1273 | /** | |
10eac19b BVA |
1274 | * srpt_rdma_read_done - RDMA read completion callback |
1275 | * @cq: Completion queue. | |
1276 | * @wc: Work completion. | |
1277 | * | |
e672a47f CH |
1278 | * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping |
1279 | * the data that has been transferred via IB RDMA had to be postponed until the | |
142ad5db | 1280 | * check_stop_free() callback. None of this is necessary anymore and needs to |
e672a47f | 1281 | * be cleaned up. |
a42d985b | 1282 | */ |
59fae4de | 1283 | static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1284 | { |
59fae4de CH |
1285 | struct srpt_rdma_ch *ch = cq->cq_context; |
1286 | struct srpt_send_ioctx *ioctx = | |
19f57298 | 1287 | container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe); |
59fae4de | 1288 | |
a42d985b BVA |
1289 | WARN_ON(ioctx->n_rdma <= 0); |
1290 | atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); | |
b99f8e4d | 1291 | ioctx->n_rdma = 0; |
a42d985b | 1292 | |
59fae4de CH |
1293 | if (unlikely(wc->status != IB_WC_SUCCESS)) { |
1294 | pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n", | |
1295 | ioctx, wc->status); | |
1296 | srpt_abort_cmd(ioctx); | |
1297 | return; | |
a42d985b | 1298 | } |
59fae4de CH |
1299 | |
1300 | if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, | |
1301 | SRPT_STATE_DATA_IN)) | |
1302 | target_execute_cmd(&ioctx->cmd); | |
1303 | else | |
1304 | pr_err("%s[%d]: wrong state = %d\n", __func__, | |
dd3bec86 | 1305 | __LINE__, ioctx->state); |
a42d985b BVA |
1306 | } |
1307 | ||
a42d985b | 1308 | /** |
10eac19b | 1309 | * srpt_build_cmd_rsp - build a SRP_RSP response |
a42d985b BVA |
1310 | * @ch: RDMA channel through which the request has been received. |
1311 | * @ioctx: I/O context associated with the SRP_CMD request. The response will | |
1312 | * be built in the buffer ioctx->buf points at and hence this function will | |
1313 | * overwrite the request data. | |
1314 | * @tag: tag of the request for which this response is being generated. | |
1315 | * @status: value for the STATUS field of the SRP_RSP information unit. | |
1316 | * | |
1317 | * Returns the size in bytes of the SRP_RSP response. | |
1318 | * | |
1319 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1320 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1321 | * response. See also SPC-2 for more information about sense data. | |
1322 | */ | |
1323 | static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch, | |
1324 | struct srpt_send_ioctx *ioctx, u64 tag, | |
1325 | int status) | |
1326 | { | |
1327 | struct srp_rsp *srp_rsp; | |
1328 | const u8 *sense_data; | |
1329 | int sense_data_len, max_sense_len; | |
1330 | ||
1331 | /* | |
1332 | * The lowest bit of all SAM-3 status codes is zero (see also | |
1333 | * paragraph 5.3 in SAM-3). | |
1334 | */ | |
1335 | WARN_ON(status & 1); | |
1336 | ||
1337 | srp_rsp = ioctx->ioctx.buf; | |
1338 | BUG_ON(!srp_rsp); | |
1339 | ||
1340 | sense_data = ioctx->sense_data; | |
1341 | sense_data_len = ioctx->cmd.scsi_sense_length; | |
1342 | WARN_ON(sense_data_len > sizeof(ioctx->sense_data)); | |
1343 | ||
9d2aa2b4 | 1344 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1345 | srp_rsp->opcode = SRP_RSP; |
1346 | srp_rsp->req_lim_delta = | |
b356c1c1 | 1347 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); |
a42d985b BVA |
1348 | srp_rsp->tag = tag; |
1349 | srp_rsp->status = status; | |
1350 | ||
1351 | if (sense_data_len) { | |
1352 | BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp)); | |
1353 | max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp); | |
1354 | if (sense_data_len > max_sense_len) { | |
9f5d32af DL |
1355 | pr_warn("truncated sense data from %d to %d" |
1356 | " bytes\n", sense_data_len, max_sense_len); | |
a42d985b BVA |
1357 | sense_data_len = max_sense_len; |
1358 | } | |
1359 | ||
1360 | srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
1361 | srp_rsp->sense_data_len = cpu_to_be32(sense_data_len); | |
1362 | memcpy(srp_rsp + 1, sense_data, sense_data_len); | |
1363 | } | |
1364 | ||
1365 | return sizeof(*srp_rsp) + sense_data_len; | |
1366 | } | |
1367 | ||
1368 | /** | |
10eac19b | 1369 | * srpt_build_tskmgmt_rsp - build a task management response |
a42d985b BVA |
1370 | * @ch: RDMA channel through which the request has been received. |
1371 | * @ioctx: I/O context in which the SRP_RSP response will be built. | |
1372 | * @rsp_code: RSP_CODE that will be stored in the response. | |
1373 | * @tag: Tag of the request for which this response is being generated. | |
1374 | * | |
1375 | * Returns the size in bytes of the SRP_RSP response. | |
1376 | * | |
1377 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1378 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1379 | * response. | |
1380 | */ | |
1381 | static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch, | |
1382 | struct srpt_send_ioctx *ioctx, | |
1383 | u8 rsp_code, u64 tag) | |
1384 | { | |
1385 | struct srp_rsp *srp_rsp; | |
1386 | int resp_data_len; | |
1387 | int resp_len; | |
1388 | ||
c807f643 | 1389 | resp_data_len = 4; |
a42d985b BVA |
1390 | resp_len = sizeof(*srp_rsp) + resp_data_len; |
1391 | ||
1392 | srp_rsp = ioctx->ioctx.buf; | |
1393 | BUG_ON(!srp_rsp); | |
9d2aa2b4 | 1394 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1395 | |
1396 | srp_rsp->opcode = SRP_RSP; | |
b356c1c1 VT |
1397 | srp_rsp->req_lim_delta = |
1398 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); | |
a42d985b BVA |
1399 | srp_rsp->tag = tag; |
1400 | ||
c807f643 JW |
1401 | srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID; |
1402 | srp_rsp->resp_data_len = cpu_to_be32(resp_data_len); | |
1403 | srp_rsp->data[3] = rsp_code; | |
a42d985b BVA |
1404 | |
1405 | return resp_len; | |
1406 | } | |
1407 | ||
a42d985b BVA |
1408 | static int srpt_check_stop_free(struct se_cmd *cmd) |
1409 | { | |
9474b043 NB |
1410 | struct srpt_send_ioctx *ioctx = container_of(cmd, |
1411 | struct srpt_send_ioctx, cmd); | |
a42d985b | 1412 | |
afc16604 | 1413 | return target_put_sess_cmd(&ioctx->cmd); |
a42d985b BVA |
1414 | } |
1415 | ||
1416 | /** | |
10eac19b BVA |
1417 | * srpt_handle_cmd - process a SRP_CMD information unit |
1418 | * @ch: SRPT RDMA channel. | |
1419 | * @recv_ioctx: Receive I/O context. | |
1420 | * @send_ioctx: Send I/O context. | |
a42d985b | 1421 | */ |
2c7f37ff BVA |
1422 | static void srpt_handle_cmd(struct srpt_rdma_ch *ch, |
1423 | struct srpt_recv_ioctx *recv_ioctx, | |
1424 | struct srpt_send_ioctx *send_ioctx) | |
a42d985b BVA |
1425 | { |
1426 | struct se_cmd *cmd; | |
1427 | struct srp_cmd *srp_cmd; | |
b99f8e4d CH |
1428 | struct scatterlist *sg = NULL; |
1429 | unsigned sg_cnt = 0; | |
a42d985b BVA |
1430 | u64 data_len; |
1431 | enum dma_data_direction dir; | |
9474b043 | 1432 | int rc; |
a42d985b BVA |
1433 | |
1434 | BUG_ON(!send_ioctx); | |
1435 | ||
1436 | srp_cmd = recv_ioctx->ioctx.buf; | |
a42d985b | 1437 | cmd = &send_ioctx->cmd; |
649ee054 | 1438 | cmd->tag = srp_cmd->tag; |
a42d985b BVA |
1439 | |
1440 | switch (srp_cmd->task_attr) { | |
1441 | case SRP_CMD_SIMPLE_Q: | |
68d81f40 | 1442 | cmd->sam_task_attr = TCM_SIMPLE_TAG; |
a42d985b BVA |
1443 | break; |
1444 | case SRP_CMD_ORDERED_Q: | |
1445 | default: | |
68d81f40 | 1446 | cmd->sam_task_attr = TCM_ORDERED_TAG; |
a42d985b BVA |
1447 | break; |
1448 | case SRP_CMD_HEAD_OF_Q: | |
68d81f40 | 1449 | cmd->sam_task_attr = TCM_HEAD_TAG; |
a42d985b BVA |
1450 | break; |
1451 | case SRP_CMD_ACA: | |
68d81f40 | 1452 | cmd->sam_task_attr = TCM_ACA_TAG; |
a42d985b BVA |
1453 | break; |
1454 | } | |
1455 | ||
b99f8e4d CH |
1456 | rc = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &sg, &sg_cnt, |
1457 | &data_len); | |
1458 | if (rc) { | |
1459 | if (rc != -EAGAIN) { | |
1460 | pr_err("0x%llx: parsing SRP descriptor table failed.\n", | |
1461 | srp_cmd->tag); | |
1462 | } | |
2c7f37ff | 1463 | goto release_ioctx; |
a42d985b BVA |
1464 | } |
1465 | ||
b99f8e4d | 1466 | rc = target_submit_cmd_map_sgls(cmd, ch->sess, srp_cmd->cdb, |
e1dd413c BVA |
1467 | &send_ioctx->sense_data[0], |
1468 | scsilun_to_int(&srp_cmd->lun), data_len, | |
b99f8e4d CH |
1469 | TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF, |
1470 | sg, sg_cnt, NULL, 0, NULL, 0); | |
9474b043 | 1471 | if (rc != 0) { |
2c7f37ff BVA |
1472 | pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc, |
1473 | srp_cmd->tag); | |
1474 | goto release_ioctx; | |
187e70a5 | 1475 | } |
2c7f37ff | 1476 | return; |
a42d985b | 1477 | |
2c7f37ff BVA |
1478 | release_ioctx: |
1479 | send_ioctx->state = SRPT_STATE_DONE; | |
1480 | srpt_release_cmd(cmd); | |
a42d985b BVA |
1481 | } |
1482 | ||
a42d985b BVA |
1483 | static int srp_tmr_to_tcm(int fn) |
1484 | { | |
1485 | switch (fn) { | |
1486 | case SRP_TSK_ABORT_TASK: | |
1487 | return TMR_ABORT_TASK; | |
1488 | case SRP_TSK_ABORT_TASK_SET: | |
1489 | return TMR_ABORT_TASK_SET; | |
1490 | case SRP_TSK_CLEAR_TASK_SET: | |
1491 | return TMR_CLEAR_TASK_SET; | |
1492 | case SRP_TSK_LUN_RESET: | |
1493 | return TMR_LUN_RESET; | |
1494 | case SRP_TSK_CLEAR_ACA: | |
1495 | return TMR_CLEAR_ACA; | |
1496 | default: | |
1497 | return -1; | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | /** | |
10eac19b BVA |
1502 | * srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit |
1503 | * @ch: SRPT RDMA channel. | |
1504 | * @recv_ioctx: Receive I/O context. | |
1505 | * @send_ioctx: Send I/O context. | |
a42d985b BVA |
1506 | * |
1507 | * Returns 0 if and only if the request will be processed by the target core. | |
1508 | * | |
1509 | * For more information about SRP_TSK_MGMT information units, see also section | |
1510 | * 6.7 in the SRP r16a document. | |
1511 | */ | |
1512 | static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch, | |
1513 | struct srpt_recv_ioctx *recv_ioctx, | |
1514 | struct srpt_send_ioctx *send_ioctx) | |
1515 | { | |
1516 | struct srp_tsk_mgmt *srp_tsk; | |
1517 | struct se_cmd *cmd; | |
3e4f5748 | 1518 | struct se_session *sess = ch->sess; |
a42d985b | 1519 | int tcm_tmr; |
3e4f5748 | 1520 | int rc; |
a42d985b BVA |
1521 | |
1522 | BUG_ON(!send_ioctx); | |
1523 | ||
1524 | srp_tsk = recv_ioctx->ioctx.buf; | |
1525 | cmd = &send_ioctx->cmd; | |
1526 | ||
090fa24b BVA |
1527 | pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n", |
1528 | srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, ch, | |
1529 | ch->sess); | |
a42d985b BVA |
1530 | |
1531 | srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT); | |
649ee054 | 1532 | send_ioctx->cmd.tag = srp_tsk->tag; |
a42d985b | 1533 | tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func); |
e1dd413c BVA |
1534 | rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, |
1535 | scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr, | |
1536 | GFP_KERNEL, srp_tsk->task_tag, | |
1537 | TARGET_SCF_ACK_KREF); | |
3e4f5748 NB |
1538 | if (rc != 0) { |
1539 | send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED; | |
de103c93 | 1540 | goto fail; |
a42d985b | 1541 | } |
de103c93 CH |
1542 | return; |
1543 | fail: | |
de103c93 | 1544 | transport_send_check_condition_and_sense(cmd, 0, 0); // XXX: |
a42d985b BVA |
1545 | } |
1546 | ||
1547 | /** | |
10eac19b | 1548 | * srpt_handle_new_iu - process a newly received information unit |
a42d985b | 1549 | * @ch: RDMA channel through which the information unit has been received. |
10eac19b | 1550 | * @recv_ioctx: Receive I/O context associated with the information unit. |
a42d985b | 1551 | */ |
fcf58936 BVA |
1552 | static bool |
1553 | srpt_handle_new_iu(struct srpt_rdma_ch *ch, struct srpt_recv_ioctx *recv_ioctx) | |
a42d985b | 1554 | { |
fcf58936 | 1555 | struct srpt_send_ioctx *send_ioctx = NULL; |
a42d985b | 1556 | struct srp_cmd *srp_cmd; |
fcf58936 BVA |
1557 | bool res = false; |
1558 | u8 opcode; | |
a42d985b BVA |
1559 | |
1560 | BUG_ON(!ch); | |
1561 | BUG_ON(!recv_ioctx); | |
1562 | ||
fcf58936 BVA |
1563 | if (unlikely(ch->state == CH_CONNECTING)) |
1564 | goto push; | |
1565 | ||
a42d985b BVA |
1566 | ib_dma_sync_single_for_cpu(ch->sport->sdev->device, |
1567 | recv_ioctx->ioctx.dma, srp_max_req_size, | |
1568 | DMA_FROM_DEVICE); | |
1569 | ||
a42d985b | 1570 | srp_cmd = recv_ioctx->ioctx.buf; |
fcf58936 BVA |
1571 | opcode = srp_cmd->opcode; |
1572 | if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) { | |
1573 | send_ioctx = srpt_get_send_ioctx(ch); | |
b99f8e4d | 1574 | if (unlikely(!send_ioctx)) |
fcf58936 | 1575 | goto push; |
a42d985b BVA |
1576 | } |
1577 | ||
fcf58936 BVA |
1578 | if (!list_empty(&recv_ioctx->wait_list)) { |
1579 | WARN_ON_ONCE(!ch->processing_wait_list); | |
1580 | list_del_init(&recv_ioctx->wait_list); | |
1581 | } | |
1582 | ||
1583 | switch (opcode) { | |
a42d985b BVA |
1584 | case SRP_CMD: |
1585 | srpt_handle_cmd(ch, recv_ioctx, send_ioctx); | |
1586 | break; | |
1587 | case SRP_TSK_MGMT: | |
1588 | srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx); | |
1589 | break; | |
1590 | case SRP_I_LOGOUT: | |
9f5d32af | 1591 | pr_err("Not yet implemented: SRP_I_LOGOUT\n"); |
a42d985b BVA |
1592 | break; |
1593 | case SRP_CRED_RSP: | |
1594 | pr_debug("received SRP_CRED_RSP\n"); | |
1595 | break; | |
1596 | case SRP_AER_RSP: | |
1597 | pr_debug("received SRP_AER_RSP\n"); | |
1598 | break; | |
1599 | case SRP_RSP: | |
9f5d32af | 1600 | pr_err("Received SRP_RSP\n"); |
a42d985b BVA |
1601 | break; |
1602 | default: | |
fcf58936 | 1603 | pr_err("received IU with unknown opcode 0x%x\n", opcode); |
a42d985b BVA |
1604 | break; |
1605 | } | |
1606 | ||
dea26209 | 1607 | srpt_post_recv(ch->sport->sdev, ch, recv_ioctx); |
fcf58936 | 1608 | res = true; |
b99f8e4d | 1609 | |
fcf58936 BVA |
1610 | out: |
1611 | return res; | |
1612 | ||
1613 | push: | |
1614 | if (list_empty(&recv_ioctx->wait_list)) { | |
1615 | WARN_ON_ONCE(ch->processing_wait_list); | |
1616 | list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list); | |
1617 | } | |
1618 | goto out; | |
a42d985b BVA |
1619 | } |
1620 | ||
59fae4de | 1621 | static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1622 | { |
59fae4de CH |
1623 | struct srpt_rdma_ch *ch = cq->cq_context; |
1624 | struct srpt_recv_ioctx *ioctx = | |
1625 | container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe); | |
a42d985b | 1626 | |
a42d985b BVA |
1627 | if (wc->status == IB_WC_SUCCESS) { |
1628 | int req_lim; | |
1629 | ||
1630 | req_lim = atomic_dec_return(&ch->req_lim); | |
1631 | if (unlikely(req_lim < 0)) | |
9f5d32af | 1632 | pr_err("req_lim = %d < 0\n", req_lim); |
fcf58936 | 1633 | srpt_handle_new_iu(ch, ioctx); |
a42d985b | 1634 | } else { |
3fa7f0e9 BVA |
1635 | pr_info_ratelimited("receiving failed for ioctx %p with status %d\n", |
1636 | ioctx, wc->status); | |
a42d985b BVA |
1637 | } |
1638 | } | |
1639 | ||
539b3248 BVA |
1640 | /* |
1641 | * This function must be called from the context in which RDMA completions are | |
1642 | * processed because it accesses the wait list without protection against | |
1643 | * access from other threads. | |
1644 | */ | |
1645 | static void srpt_process_wait_list(struct srpt_rdma_ch *ch) | |
1646 | { | |
fcf58936 | 1647 | struct srpt_recv_ioctx *recv_ioctx, *tmp; |
539b3248 | 1648 | |
fcf58936 | 1649 | WARN_ON_ONCE(ch->state == CH_CONNECTING); |
539b3248 | 1650 | |
fcf58936 BVA |
1651 | if (list_empty(&ch->cmd_wait_list)) |
1652 | return; | |
1653 | ||
1654 | WARN_ON_ONCE(ch->processing_wait_list); | |
1655 | ch->processing_wait_list = true; | |
1656 | list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list, | |
1657 | wait_list) { | |
1658 | if (!srpt_handle_new_iu(ch, recv_ioctx)) | |
1659 | break; | |
539b3248 | 1660 | } |
fcf58936 | 1661 | ch->processing_wait_list = false; |
539b3248 BVA |
1662 | } |
1663 | ||
a42d985b | 1664 | /** |
10eac19b BVA |
1665 | * srpt_send_done - send completion callback |
1666 | * @cq: Completion queue. | |
1667 | * @wc: Work completion. | |
1668 | * | |
a42d985b BVA |
1669 | * Note: Although this has not yet been observed during tests, at least in |
1670 | * theory it is possible that the srpt_get_send_ioctx() call invoked by | |
1671 | * srpt_handle_new_iu() fails. This is possible because the req_lim_delta | |
1672 | * value in each response is set to one, and it is possible that this response | |
1673 | * makes the initiator send a new request before the send completion for that | |
1674 | * response has been processed. This could e.g. happen if the call to | |
1675 | * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or | |
1676 | * if IB retransmission causes generation of the send completion to be | |
1677 | * delayed. Incoming information units for which srpt_get_send_ioctx() fails | |
1678 | * are queued on cmd_wait_list. The code below processes these delayed | |
1679 | * requests one at a time. | |
1680 | */ | |
59fae4de | 1681 | static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1682 | { |
59fae4de CH |
1683 | struct srpt_rdma_ch *ch = cq->cq_context; |
1684 | struct srpt_send_ioctx *ioctx = | |
1685 | container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe); | |
1686 | enum srpt_command_state state; | |
a42d985b | 1687 | |
59fae4de CH |
1688 | state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); |
1689 | ||
1690 | WARN_ON(state != SRPT_STATE_CMD_RSP_SENT && | |
1691 | state != SRPT_STATE_MGMT_RSP_SENT); | |
1692 | ||
b99f8e4d | 1693 | atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail); |
59fae4de | 1694 | |
49f40163 | 1695 | if (wc->status != IB_WC_SUCCESS) |
59fae4de CH |
1696 | pr_info("sending response for ioctx 0x%p failed" |
1697 | " with status %d\n", ioctx, wc->status); | |
1698 | ||
59fae4de | 1699 | if (state != SRPT_STATE_DONE) { |
59fae4de | 1700 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b | 1701 | } else { |
59fae4de CH |
1702 | pr_err("IB completion has been received too late for" |
1703 | " wr_id = %u.\n", ioctx->ioctx.index); | |
a42d985b BVA |
1704 | } |
1705 | ||
539b3248 | 1706 | srpt_process_wait_list(ch); |
a42d985b BVA |
1707 | } |
1708 | ||
a42d985b | 1709 | /** |
10eac19b BVA |
1710 | * srpt_create_ch_ib - create receive and send completion queues |
1711 | * @ch: SRPT RDMA channel. | |
a42d985b BVA |
1712 | */ |
1713 | static int srpt_create_ch_ib(struct srpt_rdma_ch *ch) | |
1714 | { | |
1715 | struct ib_qp_init_attr *qp_init; | |
1716 | struct srpt_port *sport = ch->sport; | |
1717 | struct srpt_device *sdev = sport->sdev; | |
30c6d877 | 1718 | const struct ib_device_attr *attrs = &sdev->device->attrs; |
ed262287 | 1719 | int sq_size = sport->port_attrib.srp_sq_size; |
dea26209 | 1720 | int i, ret; |
a42d985b BVA |
1721 | |
1722 | WARN_ON(ch->rq_size < 1); | |
1723 | ||
1724 | ret = -ENOMEM; | |
9d2aa2b4 | 1725 | qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL); |
a42d985b BVA |
1726 | if (!qp_init) |
1727 | goto out; | |
1728 | ||
ab477c1f | 1729 | retry: |
ed262287 | 1730 | ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + sq_size, |
59fae4de | 1731 | 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE); |
a42d985b BVA |
1732 | if (IS_ERR(ch->cq)) { |
1733 | ret = PTR_ERR(ch->cq); | |
9f5d32af | 1734 | pr_err("failed to create CQ cqe= %d ret= %d\n", |
ed262287 | 1735 | ch->rq_size + sq_size, ret); |
a42d985b BVA |
1736 | goto out; |
1737 | } | |
1738 | ||
1739 | qp_init->qp_context = (void *)ch; | |
1740 | qp_init->event_handler | |
1741 | = (void(*)(struct ib_event *, void*))srpt_qp_event; | |
1742 | qp_init->send_cq = ch->cq; | |
1743 | qp_init->recv_cq = ch->cq; | |
a42d985b BVA |
1744 | qp_init->sq_sig_type = IB_SIGNAL_REQ_WR; |
1745 | qp_init->qp_type = IB_QPT_RC; | |
b99f8e4d CH |
1746 | /* |
1747 | * We divide up our send queue size into half SEND WRs to send the | |
1748 | * completions, and half R/W contexts to actually do the RDMA | |
1749 | * READ/WRITE transfers. Note that we need to allocate CQ slots for | |
1750 | * both both, as RDMA contexts will also post completions for the | |
1751 | * RDMA READ case. | |
1752 | */ | |
ed262287 BVA |
1753 | qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr); |
1754 | qp_init->cap.max_rdma_ctxs = sq_size / 2; | |
33023fb8 SW |
1755 | qp_init->cap.max_send_sge = min(attrs->max_send_sge, |
1756 | SRPT_MAX_SG_PER_WQE); | |
b99f8e4d | 1757 | qp_init->port_num = ch->sport->port; |
dea26209 BVA |
1758 | if (sdev->use_srq) { |
1759 | qp_init->srq = sdev->srq; | |
1760 | } else { | |
1761 | qp_init->cap.max_recv_wr = ch->rq_size; | |
33023fb8 SW |
1762 | qp_init->cap.max_recv_sge = min(attrs->max_recv_sge, |
1763 | SRPT_MAX_SG_PER_WQE); | |
dea26209 | 1764 | } |
a42d985b | 1765 | |
63cf1a90 BVA |
1766 | if (ch->using_rdma_cm) { |
1767 | ret = rdma_create_qp(ch->rdma_cm.cm_id, sdev->pd, qp_init); | |
1768 | ch->qp = ch->rdma_cm.cm_id->qp; | |
1769 | } else { | |
1770 | ch->qp = ib_create_qp(sdev->pd, qp_init); | |
1771 | if (!IS_ERR(ch->qp)) { | |
1772 | ret = srpt_init_ch_qp(ch, ch->qp); | |
1773 | if (ret) | |
1774 | ib_destroy_qp(ch->qp); | |
1775 | } else { | |
1776 | ret = PTR_ERR(ch->qp); | |
1777 | } | |
1778 | } | |
1779 | if (ret) { | |
1780 | bool retry = sq_size > MIN_SRPT_SQ_SIZE; | |
1781 | ||
1782 | if (retry) { | |
1783 | pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n", | |
1784 | sq_size, ret); | |
1785 | ib_free_cq(ch->cq); | |
1786 | sq_size = max(sq_size / 2, MIN_SRPT_SQ_SIZE); | |
1787 | goto retry; | |
1788 | } else { | |
1789 | pr_err("failed to create queue pair with sq_size = %d (%d)\n", | |
1790 | sq_size, ret); | |
1791 | goto err_destroy_cq; | |
ab477c1f | 1792 | } |
a42d985b BVA |
1793 | } |
1794 | ||
1795 | atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr); | |
1796 | ||
090fa24b | 1797 | pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n", |
a42d985b | 1798 | __func__, ch->cq->cqe, qp_init->cap.max_send_sge, |
090fa24b | 1799 | qp_init->cap.max_send_wr, ch); |
a42d985b | 1800 | |
321e329b MM |
1801 | if (!sdev->use_srq) |
1802 | for (i = 0; i < ch->rq_size; i++) | |
1803 | srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]); | |
1804 | ||
a42d985b BVA |
1805 | out: |
1806 | kfree(qp_init); | |
1807 | return ret; | |
1808 | ||
a42d985b | 1809 | err_destroy_cq: |
63cf1a90 | 1810 | ch->qp = NULL; |
59fae4de | 1811 | ib_free_cq(ch->cq); |
a42d985b BVA |
1812 | goto out; |
1813 | } | |
1814 | ||
1815 | static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch) | |
1816 | { | |
a42d985b | 1817 | ib_destroy_qp(ch->qp); |
59fae4de | 1818 | ib_free_cq(ch->cq); |
a42d985b BVA |
1819 | } |
1820 | ||
1821 | /** | |
10eac19b BVA |
1822 | * srpt_close_ch - close a RDMA channel |
1823 | * @ch: SRPT RDMA channel. | |
a42d985b | 1824 | * |
aaf45bd8 BVA |
1825 | * Make sure all resources associated with the channel will be deallocated at |
1826 | * an appropriate time. | |
a42d985b | 1827 | * |
aaf45bd8 BVA |
1828 | * Returns true if and only if the channel state has been modified into |
1829 | * CH_DRAINING. | |
a42d985b | 1830 | */ |
aaf45bd8 | 1831 | static bool srpt_close_ch(struct srpt_rdma_ch *ch) |
a42d985b | 1832 | { |
aaf45bd8 | 1833 | int ret; |
a42d985b | 1834 | |
aaf45bd8 | 1835 | if (!srpt_set_ch_state(ch, CH_DRAINING)) { |
99525095 | 1836 | pr_debug("%s: already closed\n", ch->sess_name); |
aaf45bd8 | 1837 | return false; |
a42d985b | 1838 | } |
a42d985b | 1839 | |
aaf45bd8 | 1840 | kref_get(&ch->kref); |
a42d985b | 1841 | |
aaf45bd8 BVA |
1842 | ret = srpt_ch_qp_err(ch); |
1843 | if (ret < 0) | |
1844 | pr_err("%s-%d: changing queue pair into error state failed: %d\n", | |
1845 | ch->sess_name, ch->qp->qp_num, ret); | |
a42d985b | 1846 | |
aaf45bd8 BVA |
1847 | ret = srpt_zerolength_write(ch); |
1848 | if (ret < 0) { | |
1849 | pr_err("%s-%d: queuing zero-length write failed: %d\n", | |
1850 | ch->sess_name, ch->qp->qp_num, ret); | |
1851 | if (srpt_set_ch_state(ch, CH_DISCONNECTED)) | |
1852 | schedule_work(&ch->release_work); | |
1853 | else | |
1854 | WARN_ON_ONCE(true); | |
1855 | } | |
a42d985b | 1856 | |
aaf45bd8 BVA |
1857 | kref_put(&ch->kref, srpt_free_ch); |
1858 | ||
1859 | return true; | |
1d19f780 NB |
1860 | } |
1861 | ||
aaf45bd8 BVA |
1862 | /* |
1863 | * Change the channel state into CH_DISCONNECTING. If a channel has not yet | |
1864 | * reached the connected state, close it. If a channel is in the connected | |
1865 | * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is | |
1866 | * the responsibility of the caller to ensure that this function is not | |
1867 | * invoked concurrently with the code that accepts a connection. This means | |
1868 | * that this function must either be invoked from inside a CM callback | |
1869 | * function or that it must be invoked with the srpt_port.mutex held. | |
a42d985b | 1870 | */ |
aaf45bd8 | 1871 | static int srpt_disconnect_ch(struct srpt_rdma_ch *ch) |
a42d985b | 1872 | { |
a42d985b | 1873 | int ret; |
a42d985b | 1874 | |
aaf45bd8 BVA |
1875 | if (!srpt_set_ch_state(ch, CH_DISCONNECTING)) |
1876 | return -ENOTCONN; | |
a42d985b | 1877 | |
63cf1a90 BVA |
1878 | if (ch->using_rdma_cm) { |
1879 | ret = rdma_disconnect(ch->rdma_cm.cm_id); | |
1880 | } else { | |
1881 | ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0); | |
1882 | if (ret < 0) | |
1883 | ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0); | |
1884 | } | |
a42d985b | 1885 | |
aaf45bd8 BVA |
1886 | if (ret < 0 && srpt_close_ch(ch)) |
1887 | ret = 0; | |
1d19f780 | 1888 | |
aaf45bd8 BVA |
1889 | return ret; |
1890 | } | |
1891 | ||
ba60c84f | 1892 | static bool srpt_ch_closed(struct srpt_port *sport, struct srpt_rdma_ch *ch) |
44138344 | 1893 | { |
a1125314 | 1894 | struct srpt_nexus *nexus; |
44138344 BVA |
1895 | struct srpt_rdma_ch *ch2; |
1896 | bool res = true; | |
1897 | ||
1898 | rcu_read_lock(); | |
a1125314 BVA |
1899 | list_for_each_entry(nexus, &sport->nexus_list, entry) { |
1900 | list_for_each_entry(ch2, &nexus->ch_list, list) { | |
1901 | if (ch2 == ch) { | |
1902 | res = false; | |
1903 | goto done; | |
1904 | } | |
44138344 BVA |
1905 | } |
1906 | } | |
a1125314 | 1907 | done: |
44138344 BVA |
1908 | rcu_read_unlock(); |
1909 | ||
1910 | return res; | |
1911 | } | |
1912 | ||
940874f8 BVA |
1913 | /* Send DREQ and wait for DREP. */ |
1914 | static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch) | |
aaf45bd8 | 1915 | { |
ba60c84f | 1916 | struct srpt_port *sport = ch->sport; |
01b3ee13 BVA |
1917 | |
1918 | pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num, | |
1919 | ch->state); | |
1920 | ||
940874f8 BVA |
1921 | mutex_lock(&sport->mutex); |
1922 | srpt_disconnect_ch(ch); | |
ba60c84f | 1923 | mutex_unlock(&sport->mutex); |
01b3ee13 | 1924 | |
ba60c84f | 1925 | while (wait_event_timeout(sport->ch_releaseQ, srpt_ch_closed(sport, ch), |
44138344 | 1926 | 5 * HZ) == 0) |
01b3ee13 BVA |
1927 | pr_info("%s(%s-%d state %d): still waiting ...\n", __func__, |
1928 | ch->sess_name, ch->qp->qp_num, ch->state); | |
1929 | ||
01b3ee13 BVA |
1930 | } |
1931 | ||
a1125314 | 1932 | static void __srpt_close_all_ch(struct srpt_port *sport) |
aaf45bd8 | 1933 | { |
a1125314 | 1934 | struct srpt_nexus *nexus; |
aaf45bd8 BVA |
1935 | struct srpt_rdma_ch *ch; |
1936 | ||
ba60c84f | 1937 | lockdep_assert_held(&sport->mutex); |
aaf45bd8 | 1938 | |
a1125314 BVA |
1939 | list_for_each_entry(nexus, &sport->nexus_list, entry) { |
1940 | list_for_each_entry(ch, &nexus->ch_list, list) { | |
1941 | if (srpt_disconnect_ch(ch) >= 0) | |
14d15c2b BVA |
1942 | pr_info("Closing channel %s because target %s_%d has been disabled\n", |
1943 | ch->sess_name, | |
a1125314 BVA |
1944 | sport->sdev->device->name, sport->port); |
1945 | srpt_close_ch(ch); | |
1946 | } | |
1947 | } | |
1948 | } | |
1949 | ||
1950 | /* | |
1951 | * Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if | |
1952 | * it does not yet exist. | |
1953 | */ | |
1954 | static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport, | |
1955 | const u8 i_port_id[16], | |
1956 | const u8 t_port_id[16]) | |
1957 | { | |
1958 | struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n; | |
8b6dc529 | 1959 | |
a1125314 BVA |
1960 | for (;;) { |
1961 | mutex_lock(&sport->mutex); | |
1962 | list_for_each_entry(n, &sport->nexus_list, entry) { | |
1963 | if (memcmp(n->i_port_id, i_port_id, 16) == 0 && | |
1964 | memcmp(n->t_port_id, t_port_id, 16) == 0) { | |
1965 | nexus = n; | |
1966 | break; | |
1967 | } | |
1968 | } | |
1969 | if (!nexus && tmp_nexus) { | |
1970 | list_add_tail_rcu(&tmp_nexus->entry, | |
1971 | &sport->nexus_list); | |
1972 | swap(nexus, tmp_nexus); | |
1973 | } | |
1974 | mutex_unlock(&sport->mutex); | |
1975 | ||
1976 | if (nexus) | |
1977 | break; | |
1978 | tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); | |
1979 | if (!tmp_nexus) { | |
1980 | nexus = ERR_PTR(-ENOMEM); | |
1981 | break; | |
8b6dc529 | 1982 | } |
a1125314 BVA |
1983 | INIT_LIST_HEAD(&tmp_nexus->ch_list); |
1984 | memcpy(tmp_nexus->i_port_id, i_port_id, 16); | |
1985 | memcpy(tmp_nexus->t_port_id, t_port_id, 16); | |
a42d985b | 1986 | } |
8b6dc529 | 1987 | |
a1125314 BVA |
1988 | kfree(tmp_nexus); |
1989 | ||
1990 | return nexus; | |
1991 | } | |
1992 | ||
1993 | static void srpt_set_enabled(struct srpt_port *sport, bool enabled) | |
1994 | __must_hold(&sport->mutex) | |
1995 | { | |
1996 | lockdep_assert_held(&sport->mutex); | |
1997 | ||
1998 | if (sport->enabled == enabled) | |
1999 | return; | |
2000 | sport->enabled = enabled; | |
2001 | if (!enabled) | |
2002 | __srpt_close_all_ch(sport); | |
a42d985b BVA |
2003 | } |
2004 | ||
aaf45bd8 BVA |
2005 | static void srpt_free_ch(struct kref *kref) |
2006 | { | |
2007 | struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref); | |
2008 | ||
795bc112 | 2009 | kfree_rcu(ch, rcu); |
a42d985b BVA |
2010 | } |
2011 | ||
2012 | static void srpt_release_channel_work(struct work_struct *w) | |
2013 | { | |
2014 | struct srpt_rdma_ch *ch; | |
2015 | struct srpt_device *sdev; | |
ba60c84f | 2016 | struct srpt_port *sport; |
9474b043 | 2017 | struct se_session *se_sess; |
a42d985b BVA |
2018 | |
2019 | ch = container_of(w, struct srpt_rdma_ch, release_work); | |
44138344 | 2020 | pr_debug("%s-%d\n", ch->sess_name, ch->qp->qp_num); |
a42d985b BVA |
2021 | |
2022 | sdev = ch->sport->sdev; | |
2023 | BUG_ON(!sdev); | |
2024 | ||
9474b043 NB |
2025 | se_sess = ch->sess; |
2026 | BUG_ON(!se_sess); | |
2027 | ||
88936259 | 2028 | target_sess_cmd_list_set_waiting(se_sess); |
be646c2d | 2029 | target_wait_for_sess_cmds(se_sess); |
9474b043 | 2030 | |
b287e351 | 2031 | target_remove_session(se_sess); |
a42d985b BVA |
2032 | ch->sess = NULL; |
2033 | ||
63cf1a90 BVA |
2034 | if (ch->using_rdma_cm) |
2035 | rdma_destroy_id(ch->rdma_cm.cm_id); | |
2036 | else | |
2037 | ib_destroy_cm_id(ch->ib_cm.cm_id); | |
0b41d6ca | 2038 | |
a42d985b BVA |
2039 | srpt_destroy_ch_ib(ch); |
2040 | ||
2041 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
2042 | ch->sport->sdev, ch->rq_size, | |
ed262287 | 2043 | ch->max_rsp_size, DMA_TO_DEVICE); |
a42d985b | 2044 | |
dea26209 BVA |
2045 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, |
2046 | sdev, ch->rq_size, | |
2047 | srp_max_req_size, DMA_FROM_DEVICE); | |
2048 | ||
ba60c84f BVA |
2049 | sport = ch->sport; |
2050 | mutex_lock(&sport->mutex); | |
795bc112 | 2051 | list_del_rcu(&ch->list); |
ba60c84f | 2052 | mutex_unlock(&sport->mutex); |
795bc112 | 2053 | |
ba60c84f | 2054 | wake_up(&sport->ch_releaseQ); |
a42d985b | 2055 | |
aaf45bd8 | 2056 | kref_put(&ch->kref, srpt_free_ch); |
a42d985b BVA |
2057 | } |
2058 | ||
a42d985b | 2059 | /** |
10eac19b | 2060 | * srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED |
63cf1a90 BVA |
2061 | * @sdev: HCA through which the login request was received. |
2062 | * @ib_cm_id: IB/CM connection identifier in case of IB/CM. | |
2063 | * @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM. | |
2064 | * @port_num: Port through which the REQ message was received. | |
2ffcf042 BVA |
2065 | * @pkey: P_Key of the incoming connection. |
2066 | * @req: SRP login request. | |
63cf1a90 BVA |
2067 | * @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted |
2068 | * the login request. | |
a42d985b BVA |
2069 | * |
2070 | * Ownership of the cm_id is transferred to the target session if this | |
63cf1a90 | 2071 | * function returns zero. Otherwise the caller remains the owner of cm_id. |
a42d985b | 2072 | */ |
63cf1a90 BVA |
2073 | static int srpt_cm_req_recv(struct srpt_device *const sdev, |
2074 | struct ib_cm_id *ib_cm_id, | |
2075 | struct rdma_cm_id *rdma_cm_id, | |
2ffcf042 BVA |
2076 | u8 port_num, __be16 pkey, |
2077 | const struct srp_login_req *req, | |
2078 | const char *src_addr) | |
a42d985b | 2079 | { |
2ffcf042 | 2080 | struct srpt_port *sport = &sdev->port[port_num - 1]; |
a1125314 | 2081 | struct srpt_nexus *nexus; |
a1125314 BVA |
2082 | struct srp_login_rsp *rsp = NULL; |
2083 | struct srp_login_rej *rej = NULL; | |
63cf1a90 BVA |
2084 | union { |
2085 | struct rdma_conn_param rdma_cm; | |
2086 | struct ib_cm_rep_param ib_cm; | |
2087 | } *rep_param = NULL; | |
847462de | 2088 | struct srpt_rdma_ch *ch = NULL; |
2dc98f09 | 2089 | char i_port_id[36]; |
a42d985b | 2090 | u32 it_iu_len; |
db7683d7 | 2091 | int i, ret; |
a42d985b BVA |
2092 | |
2093 | WARN_ON_ONCE(irqs_disabled()); | |
2094 | ||
2ffcf042 | 2095 | if (WARN_ON(!sdev || !req)) |
a42d985b BVA |
2096 | return -EINVAL; |
2097 | ||
a42d985b BVA |
2098 | it_iu_len = be32_to_cpu(req->req_it_iu_len); |
2099 | ||
c5efb621 | 2100 | pr_info("Received SRP_LOGIN_REQ with i_port_id %pI6, t_port_id %pI6 and it_iu_len %d on port %d (guid=%pI6); pkey %#04x\n", |
b185d3f8 | 2101 | req->initiator_port_id, req->target_port_id, it_iu_len, |
2ffcf042 | 2102 | port_num, &sport->gid, be16_to_cpu(pkey)); |
a42d985b | 2103 | |
a1125314 BVA |
2104 | nexus = srpt_get_nexus(sport, req->initiator_port_id, |
2105 | req->target_port_id); | |
2106 | if (IS_ERR(nexus)) { | |
2107 | ret = PTR_ERR(nexus); | |
2108 | goto out; | |
2109 | } | |
2110 | ||
db7683d7 | 2111 | ret = -ENOMEM; |
9d2aa2b4 BVA |
2112 | rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); |
2113 | rej = kzalloc(sizeof(*rej), GFP_KERNEL); | |
2114 | rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL); | |
db7683d7 | 2115 | if (!rsp || !rej || !rep_param) |
a42d985b | 2116 | goto out; |
a42d985b | 2117 | |
db7683d7 | 2118 | ret = -EINVAL; |
a42d985b | 2119 | if (it_iu_len > srp_max_req_size || it_iu_len < 64) { |
b356c1c1 | 2120 | rej->reason = cpu_to_be32( |
db7683d7 BVA |
2121 | SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE); |
2122 | pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n", | |
a42d985b BVA |
2123 | it_iu_len, 64, srp_max_req_size); |
2124 | goto reject; | |
2125 | } | |
2126 | ||
2127 | if (!sport->enabled) { | |
db7683d7 BVA |
2128 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
2129 | pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n", | |
2ffcf042 | 2130 | sport->sdev->device->name, port_num); |
a42d985b BVA |
2131 | goto reject; |
2132 | } | |
2133 | ||
a42d985b BVA |
2134 | if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid) |
2135 | || *(__be64 *)(req->target_port_id + 8) != | |
2136 | cpu_to_be64(srpt_service_guid)) { | |
b356c1c1 | 2137 | rej->reason = cpu_to_be32( |
db7683d7 BVA |
2138 | SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL); |
2139 | pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n"); | |
a42d985b BVA |
2140 | goto reject; |
2141 | } | |
2142 | ||
db7683d7 | 2143 | ret = -ENOMEM; |
9d2aa2b4 | 2144 | ch = kzalloc(sizeof(*ch), GFP_KERNEL); |
a42d985b | 2145 | if (!ch) { |
db7683d7 BVA |
2146 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
2147 | pr_err("rejected SRP_LOGIN_REQ because out of memory.\n"); | |
a42d985b BVA |
2148 | goto reject; |
2149 | } | |
2150 | ||
aaf45bd8 | 2151 | kref_init(&ch->kref); |
2ffcf042 | 2152 | ch->pkey = be16_to_cpu(pkey); |
a1125314 | 2153 | ch->nexus = nexus; |
aaf45bd8 | 2154 | ch->zw_cqe.done = srpt_zerolength_write_done; |
a42d985b | 2155 | INIT_WORK(&ch->release_work, srpt_release_channel_work); |
2ffcf042 | 2156 | ch->sport = sport; |
63cf1a90 BVA |
2157 | if (ib_cm_id) { |
2158 | ch->ib_cm.cm_id = ib_cm_id; | |
2159 | ib_cm_id->context = ch; | |
2160 | } else { | |
2161 | ch->using_rdma_cm = true; | |
2162 | ch->rdma_cm.cm_id = rdma_cm_id; | |
2163 | rdma_cm_id->context = ch; | |
2164 | } | |
a42d985b | 2165 | /* |
7a01d05c BVA |
2166 | * ch->rq_size should be at least as large as the initiator queue |
2167 | * depth to avoid that the initiator driver has to report QUEUE_FULL | |
2168 | * to the SCSI mid-layer. | |
a42d985b | 2169 | */ |
ed262287 | 2170 | ch->rq_size = min(MAX_SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr); |
a42d985b BVA |
2171 | spin_lock_init(&ch->spinlock); |
2172 | ch->state = CH_CONNECTING; | |
2173 | INIT_LIST_HEAD(&ch->cmd_wait_list); | |
ed262287 | 2174 | ch->max_rsp_size = ch->sport->port_attrib.srp_max_rsp_size; |
a42d985b BVA |
2175 | |
2176 | ch->ioctx_ring = (struct srpt_send_ioctx **) | |
2177 | srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, | |
2178 | sizeof(*ch->ioctx_ring[0]), | |
ed262287 | 2179 | ch->max_rsp_size, DMA_TO_DEVICE); |
db7683d7 BVA |
2180 | if (!ch->ioctx_ring) { |
2181 | pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n"); | |
2182 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
a42d985b | 2183 | goto free_ch; |
db7683d7 | 2184 | } |
a42d985b | 2185 | |
3c968887 BVA |
2186 | INIT_LIST_HEAD(&ch->free_list); |
2187 | for (i = 0; i < ch->rq_size; i++) { | |
2188 | ch->ioctx_ring[i]->ch = ch; | |
2189 | list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list); | |
2190 | } | |
dea26209 BVA |
2191 | if (!sdev->use_srq) { |
2192 | ch->ioctx_recv_ring = (struct srpt_recv_ioctx **) | |
2193 | srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, | |
2194 | sizeof(*ch->ioctx_recv_ring[0]), | |
2195 | srp_max_req_size, | |
2196 | DMA_FROM_DEVICE); | |
2197 | if (!ch->ioctx_recv_ring) { | |
2198 | pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n"); | |
2199 | rej->reason = | |
2200 | cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
2201 | goto free_ring; | |
2202 | } | |
fcf58936 BVA |
2203 | for (i = 0; i < ch->rq_size; i++) |
2204 | INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list); | |
dea26209 | 2205 | } |
3c968887 | 2206 | |
a42d985b | 2207 | ret = srpt_create_ch_ib(ch); |
a42d985b | 2208 | if (ret) { |
b356c1c1 | 2209 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
db7683d7 BVA |
2210 | pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n"); |
2211 | goto free_recv_ring; | |
a42d985b | 2212 | } |
f246c941 | 2213 | |
2ffcf042 | 2214 | strlcpy(ch->sess_name, src_addr, sizeof(ch->sess_name)); |
2dc98f09 | 2215 | snprintf(i_port_id, sizeof(i_port_id), "0x%016llx%016llx", |
a1125314 BVA |
2216 | be64_to_cpu(*(__be64 *)nexus->i_port_id), |
2217 | be64_to_cpu(*(__be64 *)(nexus->i_port_id + 8))); | |
a42d985b BVA |
2218 | |
2219 | pr_debug("registering session %s\n", ch->sess_name); | |
2220 | ||
2bce1a6d | 2221 | if (sport->port_guid_tpg.se_tpg_wwn) |
fa834287 | 2222 | ch->sess = target_setup_session(&sport->port_guid_tpg, 0, 0, |
2bce1a6d | 2223 | TARGET_PROT_NORMAL, |
2dc98f09 | 2224 | ch->sess_name, ch, NULL); |
2bce1a6d | 2225 | if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess)) |
fa834287 | 2226 | ch->sess = target_setup_session(&sport->port_gid_tpg, 0, 0, |
2dc98f09 | 2227 | TARGET_PROT_NORMAL, i_port_id, ch, |
0d38c240 BVA |
2228 | NULL); |
2229 | /* Retry without leading "0x" */ | |
2bce1a6d | 2230 | if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess)) |
fa834287 | 2231 | ch->sess = target_setup_session(&sport->port_gid_tpg, 0, 0, |
0d38c240 | 2232 | TARGET_PROT_NORMAL, |
2dc98f09 | 2233 | i_port_id + 2, ch, NULL); |
2bce1a6d | 2234 | if (IS_ERR_OR_NULL(ch->sess)) { |
847462de | 2235 | WARN_ON_ONCE(ch->sess == NULL); |
db7683d7 | 2236 | ret = PTR_ERR(ch->sess); |
847462de | 2237 | ch->sess = NULL; |
db7683d7 BVA |
2238 | pr_info("Rejected login for initiator %s: ret = %d.\n", |
2239 | ch->sess_name, ret); | |
2240 | rej->reason = cpu_to_be32(ret == -ENOMEM ? | |
b42057ab | 2241 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES : |
f246c941 | 2242 | SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED); |
847462de | 2243 | goto destroy_ib; |
db7683d7 BVA |
2244 | } |
2245 | ||
2246 | mutex_lock(&sport->mutex); | |
2247 | ||
2248 | if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) { | |
2249 | struct srpt_rdma_ch *ch2; | |
2250 | ||
2251 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN; | |
2252 | ||
2253 | list_for_each_entry(ch2, &nexus->ch_list, list) { | |
2254 | if (srpt_disconnect_ch(ch2) < 0) | |
2255 | continue; | |
2256 | pr_info("Relogin - closed existing channel %s\n", | |
2257 | ch2->sess_name); | |
2258 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_TERMINATED; | |
2259 | } | |
2260 | } else { | |
2261 | rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED; | |
2262 | } | |
2263 | ||
2264 | list_add_tail_rcu(&ch->list, &nexus->ch_list); | |
2265 | ||
2266 | if (!sport->enabled) { | |
2267 | rej->reason = cpu_to_be32( | |
2268 | SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
2269 | pr_info("rejected SRP_LOGIN_REQ because target %s_%d is not enabled\n", | |
2ffcf042 | 2270 | sdev->device->name, port_num); |
db7683d7 BVA |
2271 | mutex_unlock(&sport->mutex); |
2272 | goto reject; | |
2273 | } | |
2274 | ||
2275 | mutex_unlock(&sport->mutex); | |
2276 | ||
63cf1a90 | 2277 | ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rtr(ch, ch->qp); |
db7683d7 BVA |
2278 | if (ret) { |
2279 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
2280 | pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n", | |
2281 | ret); | |
847462de | 2282 | goto reject; |
a42d985b | 2283 | } |
a42d985b | 2284 | |
090fa24b BVA |
2285 | pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch->sess, |
2286 | ch->sess_name, ch); | |
a42d985b BVA |
2287 | |
2288 | /* create srp_login_response */ | |
2289 | rsp->opcode = SRP_LOGIN_RSP; | |
2290 | rsp->tag = req->tag; | |
2291 | rsp->max_it_iu_len = req->req_it_iu_len; | |
2292 | rsp->max_ti_iu_len = req->req_it_iu_len; | |
2293 | ch->max_ti_iu_len = it_iu_len; | |
db7683d7 BVA |
2294 | rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
2295 | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b BVA |
2296 | rsp->req_lim_delta = cpu_to_be32(ch->rq_size); |
2297 | atomic_set(&ch->req_lim, ch->rq_size); | |
2298 | atomic_set(&ch->req_lim_delta, 0); | |
2299 | ||
2300 | /* create cm reply */ | |
63cf1a90 BVA |
2301 | if (ch->using_rdma_cm) { |
2302 | rep_param->rdma_cm.private_data = (void *)rsp; | |
2303 | rep_param->rdma_cm.private_data_len = sizeof(*rsp); | |
2304 | rep_param->rdma_cm.rnr_retry_count = 7; | |
2305 | rep_param->rdma_cm.flow_control = 1; | |
2306 | rep_param->rdma_cm.responder_resources = 4; | |
2307 | rep_param->rdma_cm.initiator_depth = 4; | |
2308 | } else { | |
2309 | rep_param->ib_cm.qp_num = ch->qp->qp_num; | |
2310 | rep_param->ib_cm.private_data = (void *)rsp; | |
2311 | rep_param->ib_cm.private_data_len = sizeof(*rsp); | |
2312 | rep_param->ib_cm.rnr_retry_count = 7; | |
2313 | rep_param->ib_cm.flow_control = 1; | |
2314 | rep_param->ib_cm.failover_accepted = 0; | |
2315 | rep_param->ib_cm.srq = 1; | |
2316 | rep_param->ib_cm.responder_resources = 4; | |
2317 | rep_param->ib_cm.initiator_depth = 4; | |
2318 | } | |
a42d985b | 2319 | |
db7683d7 BVA |
2320 | /* |
2321 | * Hold the sport mutex while accepting a connection to avoid that | |
2322 | * srpt_disconnect_ch() is invoked concurrently with this code. | |
2323 | */ | |
ba60c84f | 2324 | mutex_lock(&sport->mutex); |
63cf1a90 BVA |
2325 | if (sport->enabled && ch->state == CH_CONNECTING) { |
2326 | if (ch->using_rdma_cm) | |
2327 | ret = rdma_accept(rdma_cm_id, &rep_param->rdma_cm); | |
2328 | else | |
2329 | ret = ib_send_cm_rep(ib_cm_id, &rep_param->ib_cm); | |
2330 | } else { | |
db7683d7 | 2331 | ret = -EINVAL; |
63cf1a90 | 2332 | } |
ba60c84f | 2333 | mutex_unlock(&sport->mutex); |
a42d985b | 2334 | |
db7683d7 BVA |
2335 | switch (ret) { |
2336 | case 0: | |
2337 | break; | |
2338 | case -EINVAL: | |
2339 | goto reject; | |
2340 | default: | |
2341 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
2342 | pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n", | |
2343 | ret); | |
2344 | goto reject; | |
2345 | } | |
a42d985b | 2346 | |
db7683d7 | 2347 | goto out; |
a42d985b BVA |
2348 | |
2349 | destroy_ib: | |
2350 | srpt_destroy_ch_ib(ch); | |
2351 | ||
dea26209 BVA |
2352 | free_recv_ring: |
2353 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, | |
2354 | ch->sport->sdev, ch->rq_size, | |
2355 | srp_max_req_size, DMA_FROM_DEVICE); | |
2356 | ||
a42d985b BVA |
2357 | free_ring: |
2358 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
2359 | ch->sport->sdev, ch->rq_size, | |
ed262287 | 2360 | ch->max_rsp_size, DMA_TO_DEVICE); |
6869e000 | 2361 | |
a42d985b | 2362 | free_ch: |
6869e000 BVA |
2363 | if (rdma_cm_id) |
2364 | rdma_cm_id->context = NULL; | |
2365 | else | |
63cf1a90 | 2366 | ib_cm_id->context = NULL; |
a42d985b | 2367 | kfree(ch); |
db7683d7 BVA |
2368 | ch = NULL; |
2369 | ||
2370 | WARN_ON_ONCE(ret == 0); | |
a42d985b BVA |
2371 | |
2372 | reject: | |
db7683d7 | 2373 | pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason)); |
a42d985b BVA |
2374 | rej->opcode = SRP_LOGIN_REJ; |
2375 | rej->tag = req->tag; | |
db7683d7 BVA |
2376 | rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
2377 | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b | 2378 | |
63cf1a90 BVA |
2379 | if (rdma_cm_id) |
2380 | rdma_reject(rdma_cm_id, rej, sizeof(*rej)); | |
2381 | else | |
2382 | ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, | |
2383 | rej, sizeof(*rej)); | |
a42d985b | 2384 | |
847462de BVA |
2385 | if (ch && ch->sess) { |
2386 | srpt_close_ch(ch); | |
2387 | /* | |
2388 | * Tell the caller not to free cm_id since | |
2389 | * srpt_release_channel_work() will do that. | |
2390 | */ | |
2391 | ret = 0; | |
2392 | } | |
2393 | ||
a42d985b BVA |
2394 | out: |
2395 | kfree(rep_param); | |
2396 | kfree(rsp); | |
2397 | kfree(rej); | |
2398 | ||
2399 | return ret; | |
2400 | } | |
2401 | ||
2ffcf042 | 2402 | static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id, |
e7ff98ae | 2403 | const struct ib_cm_req_event_param *param, |
2ffcf042 BVA |
2404 | void *private_data) |
2405 | { | |
2406 | char sguid[40]; | |
2407 | ||
2408 | srpt_format_guid(sguid, sizeof(sguid), | |
2409 | ¶m->primary_path->dgid.global.interface_id); | |
2410 | ||
63cf1a90 BVA |
2411 | return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port, |
2412 | param->primary_path->pkey, | |
2ffcf042 BVA |
2413 | private_data, sguid); |
2414 | } | |
2415 | ||
63cf1a90 BVA |
2416 | static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id, |
2417 | struct rdma_cm_event *event) | |
2418 | { | |
2419 | struct srpt_device *sdev; | |
2420 | struct srp_login_req req; | |
2421 | const struct srp_login_req_rdma *req_rdma; | |
2422 | char src_addr[40]; | |
2423 | ||
2424 | sdev = ib_get_client_data(cm_id->device, &srpt_client); | |
2425 | if (!sdev) | |
2426 | return -ECONNREFUSED; | |
2427 | ||
2428 | if (event->param.conn.private_data_len < sizeof(*req_rdma)) | |
2429 | return -EINVAL; | |
2430 | ||
2431 | /* Transform srp_login_req_rdma into srp_login_req. */ | |
2432 | req_rdma = event->param.conn.private_data; | |
2433 | memset(&req, 0, sizeof(req)); | |
2434 | req.opcode = req_rdma->opcode; | |
2435 | req.tag = req_rdma->tag; | |
2436 | req.req_it_iu_len = req_rdma->req_it_iu_len; | |
2437 | req.req_buf_fmt = req_rdma->req_buf_fmt; | |
2438 | req.req_flags = req_rdma->req_flags; | |
2439 | memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16); | |
2440 | memcpy(req.target_port_id, req_rdma->target_port_id, 16); | |
2441 | ||
2442 | snprintf(src_addr, sizeof(src_addr), "%pIS", | |
2443 | &cm_id->route.addr.src_addr); | |
2444 | ||
2445 | return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num, | |
2446 | cm_id->route.path_rec->pkey, &req, src_addr); | |
2447 | } | |
2448 | ||
2739b592 BVA |
2449 | static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch, |
2450 | enum ib_cm_rej_reason reason, | |
2451 | const u8 *private_data, | |
2452 | u8 private_data_len) | |
a42d985b | 2453 | { |
c13c90ea BVA |
2454 | char *priv = NULL; |
2455 | int i; | |
2456 | ||
2457 | if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1, | |
2458 | GFP_KERNEL))) { | |
2459 | for (i = 0; i < private_data_len; i++) | |
2460 | sprintf(priv + 3 * i, " %02x", private_data[i]); | |
2461 | } | |
2462 | pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n", | |
2463 | ch->sess_name, ch->qp->qp_num, reason, private_data_len ? | |
2464 | "; private data" : "", priv ? priv : " (?)"); | |
2465 | kfree(priv); | |
a42d985b BVA |
2466 | } |
2467 | ||
2468 | /** | |
10eac19b BVA |
2469 | * srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event |
2470 | * @ch: SRPT RDMA channel. | |
a42d985b | 2471 | * |
63cf1a90 BVA |
2472 | * An RTU (ready to use) message indicates that the connection has been |
2473 | * established and that the recipient may begin transmitting. | |
a42d985b | 2474 | */ |
2739b592 | 2475 | static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch) |
a42d985b | 2476 | { |
a42d985b BVA |
2477 | int ret; |
2478 | ||
63cf1a90 | 2479 | ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp); |
db7683d7 BVA |
2480 | if (ret < 0) { |
2481 | pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name, | |
2482 | ch->qp->qp_num); | |
2483 | srpt_close_ch(ch); | |
2484 | return; | |
a42d985b | 2485 | } |
db7683d7 | 2486 | |
db7683d7 BVA |
2487 | /* |
2488 | * Note: calling srpt_close_ch() if the transition to the LIVE state | |
2489 | * fails is not necessary since that means that that function has | |
2490 | * already been invoked from another thread. | |
2491 | */ | |
e28a547d | 2492 | if (!srpt_set_ch_state(ch, CH_LIVE)) { |
db7683d7 BVA |
2493 | pr_err("%s-%d: channel transition to LIVE state failed\n", |
2494 | ch->sess_name, ch->qp->qp_num); | |
e28a547d BVA |
2495 | return; |
2496 | } | |
2497 | ||
2498 | /* Trigger wait list processing. */ | |
2499 | ret = srpt_zerolength_write(ch); | |
2500 | WARN_ONCE(ret < 0, "%d\n", ret); | |
a42d985b BVA |
2501 | } |
2502 | ||
a42d985b | 2503 | /** |
10eac19b BVA |
2504 | * srpt_cm_handler - IB connection manager callback function |
2505 | * @cm_id: IB/CM connection identifier. | |
2506 | * @event: IB/CM event. | |
a42d985b BVA |
2507 | * |
2508 | * A non-zero return value will cause the caller destroy the CM ID. | |
2509 | * | |
2510 | * Note: srpt_cm_handler() must only return a non-zero value when transferring | |
2511 | * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning | |
2512 | * a non-zero value in any other case will trigger a race with the | |
2513 | * ib_destroy_cm_id() call in srpt_release_channel(). | |
2514 | */ | |
e7ff98ae PP |
2515 | static int srpt_cm_handler(struct ib_cm_id *cm_id, |
2516 | const struct ib_cm_event *event) | |
a42d985b | 2517 | { |
2739b592 | 2518 | struct srpt_rdma_ch *ch = cm_id->context; |
a42d985b BVA |
2519 | int ret; |
2520 | ||
2521 | ret = 0; | |
2522 | switch (event->event) { | |
2523 | case IB_CM_REQ_RECEIVED: | |
2ffcf042 BVA |
2524 | ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd, |
2525 | event->private_data); | |
a42d985b BVA |
2526 | break; |
2527 | case IB_CM_REJ_RECEIVED: | |
2739b592 BVA |
2528 | srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason, |
2529 | event->private_data, | |
2530 | IB_CM_REJ_PRIVATE_DATA_SIZE); | |
a42d985b BVA |
2531 | break; |
2532 | case IB_CM_RTU_RECEIVED: | |
2533 | case IB_CM_USER_ESTABLISHED: | |
2739b592 | 2534 | srpt_cm_rtu_recv(ch); |
a42d985b BVA |
2535 | break; |
2536 | case IB_CM_DREQ_RECEIVED: | |
aaf45bd8 | 2537 | srpt_disconnect_ch(ch); |
a42d985b BVA |
2538 | break; |
2539 | case IB_CM_DREP_RECEIVED: | |
2739b592 BVA |
2540 | pr_info("Received CM DREP message for ch %s-%d.\n", |
2541 | ch->sess_name, ch->qp->qp_num); | |
aaf45bd8 | 2542 | srpt_close_ch(ch); |
a42d985b BVA |
2543 | break; |
2544 | case IB_CM_TIMEWAIT_EXIT: | |
2739b592 BVA |
2545 | pr_info("Received CM TimeWait exit for ch %s-%d.\n", |
2546 | ch->sess_name, ch->qp->qp_num); | |
aaf45bd8 | 2547 | srpt_close_ch(ch); |
a42d985b BVA |
2548 | break; |
2549 | case IB_CM_REP_ERROR: | |
2739b592 BVA |
2550 | pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
2551 | ch->qp->qp_num); | |
a42d985b BVA |
2552 | break; |
2553 | case IB_CM_DREQ_ERROR: | |
1e20a2a5 | 2554 | pr_info("Received CM DREQ ERROR event.\n"); |
a42d985b BVA |
2555 | break; |
2556 | case IB_CM_MRA_RECEIVED: | |
1e20a2a5 | 2557 | pr_info("Received CM MRA event\n"); |
a42d985b BVA |
2558 | break; |
2559 | default: | |
1e20a2a5 | 2560 | pr_err("received unrecognized CM event %d\n", event->event); |
a42d985b BVA |
2561 | break; |
2562 | } | |
2563 | ||
2564 | return ret; | |
2565 | } | |
2566 | ||
63cf1a90 BVA |
2567 | static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id, |
2568 | struct rdma_cm_event *event) | |
2569 | { | |
2570 | struct srpt_rdma_ch *ch = cm_id->context; | |
2571 | int ret = 0; | |
2572 | ||
2573 | switch (event->event) { | |
2574 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
2575 | ret = srpt_rdma_cm_req_recv(cm_id, event); | |
2576 | break; | |
2577 | case RDMA_CM_EVENT_REJECTED: | |
2578 | srpt_cm_rej_recv(ch, event->status, | |
2579 | event->param.conn.private_data, | |
2580 | event->param.conn.private_data_len); | |
2581 | break; | |
2582 | case RDMA_CM_EVENT_ESTABLISHED: | |
2583 | srpt_cm_rtu_recv(ch); | |
2584 | break; | |
2585 | case RDMA_CM_EVENT_DISCONNECTED: | |
2586 | if (ch->state < CH_DISCONNECTING) | |
2587 | srpt_disconnect_ch(ch); | |
2588 | else | |
2589 | srpt_close_ch(ch); | |
2590 | break; | |
2591 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: | |
2592 | srpt_close_ch(ch); | |
2593 | break; | |
2594 | case RDMA_CM_EVENT_UNREACHABLE: | |
2595 | pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, | |
2596 | ch->qp->qp_num); | |
2597 | break; | |
2598 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
2599 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
2600 | break; | |
2601 | default: | |
2602 | pr_err("received unrecognized RDMA CM event %d\n", | |
2603 | event->event); | |
2604 | break; | |
2605 | } | |
2606 | ||
2607 | return ret; | |
2608 | } | |
2609 | ||
a42d985b BVA |
2610 | static int srpt_write_pending_status(struct se_cmd *se_cmd) |
2611 | { | |
2612 | struct srpt_send_ioctx *ioctx; | |
2613 | ||
2614 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
dd3bec86 | 2615 | return ioctx->state == SRPT_STATE_NEED_DATA; |
a42d985b BVA |
2616 | } |
2617 | ||
2618 | /* | |
10eac19b | 2619 | * srpt_write_pending - Start data transfer from initiator to target (write). |
a42d985b BVA |
2620 | */ |
2621 | static int srpt_write_pending(struct se_cmd *se_cmd) | |
2622 | { | |
fc3af58d BVA |
2623 | struct srpt_send_ioctx *ioctx = |
2624 | container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2625 | struct srpt_rdma_ch *ch = ioctx->ch; | |
9b32a596 | 2626 | struct ib_send_wr *first_wr = NULL; |
b99f8e4d | 2627 | struct ib_cqe *cqe = &ioctx->rdma_cqe; |
a42d985b | 2628 | enum srpt_command_state new_state; |
b99f8e4d | 2629 | int ret, i; |
a42d985b BVA |
2630 | |
2631 | new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA); | |
2632 | WARN_ON(new_state == SRPT_STATE_DONE); | |
b99f8e4d CH |
2633 | |
2634 | if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) { | |
2635 | pr_warn("%s: IB send queue full (needed %d)\n", | |
2636 | __func__, ioctx->n_rdma); | |
2637 | ret = -ENOMEM; | |
2638 | goto out_undo; | |
2639 | } | |
2640 | ||
2641 | cqe->done = srpt_rdma_read_done; | |
2642 | for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) { | |
2643 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
2644 | ||
2645 | first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port, | |
2646 | cqe, first_wr); | |
2647 | cqe = NULL; | |
2648 | } | |
dcc9881e | 2649 | |
9b32a596 | 2650 | ret = ib_post_send(ch->qp, first_wr, NULL); |
b99f8e4d CH |
2651 | if (ret) { |
2652 | pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n", | |
2653 | __func__, ret, ioctx->n_rdma, | |
2654 | atomic_read(&ch->sq_wr_avail)); | |
2655 | goto out_undo; | |
2656 | } | |
2657 | ||
2658 | return 0; | |
2659 | out_undo: | |
2660 | atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); | |
2661 | return ret; | |
a42d985b BVA |
2662 | } |
2663 | ||
2664 | static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status) | |
2665 | { | |
2666 | switch (tcm_mgmt_status) { | |
2667 | case TMR_FUNCTION_COMPLETE: | |
2668 | return SRP_TSK_MGMT_SUCCESS; | |
2669 | case TMR_FUNCTION_REJECTED: | |
2670 | return SRP_TSK_MGMT_FUNC_NOT_SUPP; | |
2671 | } | |
2672 | return SRP_TSK_MGMT_FAILED; | |
2673 | } | |
2674 | ||
2675 | /** | |
10eac19b BVA |
2676 | * srpt_queue_response - transmit the response to a SCSI command |
2677 | * @cmd: SCSI target command. | |
a42d985b BVA |
2678 | * |
2679 | * Callback function called by the TCM core. Must not block since it can be | |
2680 | * invoked on the context of the IB completion handler. | |
2681 | */ | |
b79fafac | 2682 | static void srpt_queue_response(struct se_cmd *cmd) |
a42d985b | 2683 | { |
b99f8e4d CH |
2684 | struct srpt_send_ioctx *ioctx = |
2685 | container_of(cmd, struct srpt_send_ioctx, cmd); | |
2686 | struct srpt_rdma_ch *ch = ioctx->ch; | |
2687 | struct srpt_device *sdev = ch->sport->sdev; | |
9b32a596 | 2688 | struct ib_send_wr send_wr, *first_wr = &send_wr; |
b99f8e4d | 2689 | struct ib_sge sge; |
a42d985b | 2690 | enum srpt_command_state state; |
b99f8e4d | 2691 | int resp_len, ret, i; |
a42d985b BVA |
2692 | u8 srp_tm_status; |
2693 | ||
a42d985b BVA |
2694 | BUG_ON(!ch); |
2695 | ||
a42d985b BVA |
2696 | state = ioctx->state; |
2697 | switch (state) { | |
2698 | case SRPT_STATE_NEW: | |
2699 | case SRPT_STATE_DATA_IN: | |
2700 | ioctx->state = SRPT_STATE_CMD_RSP_SENT; | |
2701 | break; | |
2702 | case SRPT_STATE_MGMT: | |
2703 | ioctx->state = SRPT_STATE_MGMT_RSP_SENT; | |
2704 | break; | |
2705 | default: | |
2706 | WARN(true, "ch %p; cmd %d: unexpected command state %d\n", | |
2707 | ch, ioctx->ioctx.index, ioctx->state); | |
2708 | break; | |
2709 | } | |
a42d985b | 2710 | |
55d69427 | 2711 | if (unlikely(WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) |
b79fafac | 2712 | return; |
a42d985b | 2713 | |
a42d985b | 2714 | /* For read commands, transfer the data to the initiator. */ |
b99f8e4d CH |
2715 | if (ioctx->cmd.data_direction == DMA_FROM_DEVICE && |
2716 | ioctx->cmd.data_length && | |
a42d985b | 2717 | !ioctx->queue_status_only) { |
b99f8e4d CH |
2718 | for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) { |
2719 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
2720 | ||
2721 | first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, | |
10fce586 | 2722 | ch->sport->port, NULL, first_wr); |
a42d985b BVA |
2723 | } |
2724 | } | |
2725 | ||
2726 | if (state != SRPT_STATE_MGMT) | |
649ee054 | 2727 | resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag, |
a42d985b BVA |
2728 | cmd->scsi_status); |
2729 | else { | |
2730 | srp_tm_status | |
2731 | = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response); | |
2732 | resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status, | |
649ee054 | 2733 | ioctx->cmd.tag); |
a42d985b | 2734 | } |
b99f8e4d CH |
2735 | |
2736 | atomic_inc(&ch->req_lim); | |
2737 | ||
2738 | if (unlikely(atomic_sub_return(1 + ioctx->n_rdma, | |
2739 | &ch->sq_wr_avail) < 0)) { | |
2740 | pr_warn("%s: IB send queue full (needed %d)\n", | |
2741 | __func__, ioctx->n_rdma); | |
2742 | ret = -ENOMEM; | |
2743 | goto out; | |
2744 | } | |
2745 | ||
2746 | ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len, | |
2747 | DMA_TO_DEVICE); | |
2748 | ||
2749 | sge.addr = ioctx->ioctx.dma; | |
2750 | sge.length = resp_len; | |
74333f12 | 2751 | sge.lkey = sdev->lkey; |
b99f8e4d CH |
2752 | |
2753 | ioctx->ioctx.cqe.done = srpt_send_done; | |
2754 | send_wr.next = NULL; | |
2755 | send_wr.wr_cqe = &ioctx->ioctx.cqe; | |
2756 | send_wr.sg_list = &sge; | |
2757 | send_wr.num_sge = 1; | |
2758 | send_wr.opcode = IB_WR_SEND; | |
2759 | send_wr.send_flags = IB_SEND_SIGNALED; | |
2760 | ||
9b32a596 | 2761 | ret = ib_post_send(ch->qp, first_wr, NULL); |
b99f8e4d CH |
2762 | if (ret < 0) { |
2763 | pr_err("%s: sending cmd response failed for tag %llu (%d)\n", | |
2764 | __func__, ioctx->cmd.tag, ret); | |
2765 | goto out; | |
a42d985b | 2766 | } |
b99f8e4d CH |
2767 | |
2768 | return; | |
2769 | ||
2770 | out: | |
2771 | atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail); | |
2772 | atomic_dec(&ch->req_lim); | |
2773 | srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); | |
2774 | target_put_sess_cmd(&ioctx->cmd); | |
b79fafac | 2775 | } |
a42d985b | 2776 | |
b79fafac JE |
2777 | static int srpt_queue_data_in(struct se_cmd *cmd) |
2778 | { | |
2779 | srpt_queue_response(cmd); | |
2780 | return 0; | |
2781 | } | |
2782 | ||
2783 | static void srpt_queue_tm_rsp(struct se_cmd *cmd) | |
2784 | { | |
2785 | srpt_queue_response(cmd); | |
a42d985b BVA |
2786 | } |
2787 | ||
131e6abc NB |
2788 | static void srpt_aborted_task(struct se_cmd *cmd) |
2789 | { | |
131e6abc NB |
2790 | } |
2791 | ||
a42d985b BVA |
2792 | static int srpt_queue_status(struct se_cmd *cmd) |
2793 | { | |
2794 | struct srpt_send_ioctx *ioctx; | |
2795 | ||
2796 | ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); | |
2797 | BUG_ON(ioctx->sense_data != cmd->sense_buffer); | |
2798 | if (cmd->se_cmd_flags & | |
2799 | (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE)) | |
2800 | WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION); | |
2801 | ioctx->queue_status_only = true; | |
b79fafac JE |
2802 | srpt_queue_response(cmd); |
2803 | return 0; | |
a42d985b BVA |
2804 | } |
2805 | ||
2806 | static void srpt_refresh_port_work(struct work_struct *work) | |
2807 | { | |
2808 | struct srpt_port *sport = container_of(work, struct srpt_port, work); | |
2809 | ||
2810 | srpt_refresh_port(sport); | |
2811 | } | |
2812 | ||
a1125314 BVA |
2813 | static bool srpt_ch_list_empty(struct srpt_port *sport) |
2814 | { | |
2815 | struct srpt_nexus *nexus; | |
2816 | bool res = true; | |
2817 | ||
2818 | rcu_read_lock(); | |
2819 | list_for_each_entry(nexus, &sport->nexus_list, entry) | |
2820 | if (!list_empty(&nexus->ch_list)) | |
2821 | res = false; | |
2822 | rcu_read_unlock(); | |
2823 | ||
2824 | return res; | |
2825 | } | |
2826 | ||
a42d985b | 2827 | /** |
ba60c84f BVA |
2828 | * srpt_release_sport - disable login and wait for associated channels |
2829 | * @sport: SRPT HCA port. | |
a42d985b | 2830 | */ |
ba60c84f | 2831 | static int srpt_release_sport(struct srpt_port *sport) |
a42d985b | 2832 | { |
a1125314 BVA |
2833 | struct srpt_nexus *nexus, *next_n; |
2834 | struct srpt_rdma_ch *ch; | |
a42d985b BVA |
2835 | |
2836 | WARN_ON_ONCE(irqs_disabled()); | |
2837 | ||
ba60c84f BVA |
2838 | mutex_lock(&sport->mutex); |
2839 | srpt_set_enabled(sport, false); | |
2840 | mutex_unlock(&sport->mutex); | |
a42d985b | 2841 | |
a1125314 BVA |
2842 | while (wait_event_timeout(sport->ch_releaseQ, |
2843 | srpt_ch_list_empty(sport), 5 * HZ) <= 0) { | |
2844 | pr_info("%s_%d: waiting for session unregistration ...\n", | |
2845 | sport->sdev->device->name, sport->port); | |
2846 | rcu_read_lock(); | |
2847 | list_for_each_entry(nexus, &sport->nexus_list, entry) { | |
2848 | list_for_each_entry(ch, &nexus->ch_list, list) { | |
2849 | pr_info("%s-%d: state %s\n", | |
2850 | ch->sess_name, ch->qp->qp_num, | |
2851 | get_ch_state_name(ch->state)); | |
2852 | } | |
2853 | } | |
2854 | rcu_read_unlock(); | |
2855 | } | |
2856 | ||
2857 | mutex_lock(&sport->mutex); | |
2858 | list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) { | |
2859 | list_del(&nexus->entry); | |
2860 | kfree_rcu(nexus, rcu); | |
2861 | } | |
2862 | mutex_unlock(&sport->mutex); | |
a42d985b BVA |
2863 | |
2864 | return 0; | |
2865 | } | |
2866 | ||
2bce1a6d | 2867 | static struct se_wwn *__srpt_lookup_wwn(const char *name) |
a42d985b BVA |
2868 | { |
2869 | struct ib_device *dev; | |
2870 | struct srpt_device *sdev; | |
2871 | struct srpt_port *sport; | |
2872 | int i; | |
2873 | ||
2874 | list_for_each_entry(sdev, &srpt_dev_list, list) { | |
2875 | dev = sdev->device; | |
2876 | if (!dev) | |
2877 | continue; | |
2878 | ||
2879 | for (i = 0; i < dev->phys_port_cnt; i++) { | |
2880 | sport = &sdev->port[i]; | |
2881 | ||
2bce1a6d BVA |
2882 | if (strcmp(sport->port_guid, name) == 0) |
2883 | return &sport->port_guid_wwn; | |
2884 | if (strcmp(sport->port_gid, name) == 0) | |
2885 | return &sport->port_gid_wwn; | |
a42d985b BVA |
2886 | } |
2887 | } | |
2888 | ||
2889 | return NULL; | |
2890 | } | |
2891 | ||
2bce1a6d | 2892 | static struct se_wwn *srpt_lookup_wwn(const char *name) |
a42d985b | 2893 | { |
2bce1a6d | 2894 | struct se_wwn *wwn; |
a42d985b BVA |
2895 | |
2896 | spin_lock(&srpt_dev_lock); | |
2bce1a6d | 2897 | wwn = __srpt_lookup_wwn(name); |
a42d985b BVA |
2898 | spin_unlock(&srpt_dev_lock); |
2899 | ||
2bce1a6d | 2900 | return wwn; |
a42d985b BVA |
2901 | } |
2902 | ||
c76d7d64 BVA |
2903 | static void srpt_free_srq(struct srpt_device *sdev) |
2904 | { | |
2905 | if (!sdev->srq) | |
2906 | return; | |
2907 | ||
2908 | ib_destroy_srq(sdev->srq); | |
2909 | srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, | |
2910 | sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE); | |
2911 | sdev->srq = NULL; | |
2912 | } | |
2913 | ||
2914 | static int srpt_alloc_srq(struct srpt_device *sdev) | |
2915 | { | |
2916 | struct ib_srq_init_attr srq_attr = { | |
2917 | .event_handler = srpt_srq_event, | |
2918 | .srq_context = (void *)sdev, | |
2919 | .attr.max_wr = sdev->srq_size, | |
2920 | .attr.max_sge = 1, | |
2921 | .srq_type = IB_SRQT_BASIC, | |
2922 | }; | |
2923 | struct ib_device *device = sdev->device; | |
2924 | struct ib_srq *srq; | |
2925 | int i; | |
2926 | ||
2927 | WARN_ON_ONCE(sdev->srq); | |
2928 | srq = ib_create_srq(sdev->pd, &srq_attr); | |
2929 | if (IS_ERR(srq)) { | |
2930 | pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq)); | |
2931 | return PTR_ERR(srq); | |
2932 | } | |
2933 | ||
2934 | pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size, | |
2935 | sdev->device->attrs.max_srq_wr, device->name); | |
2936 | ||
2937 | sdev->ioctx_ring = (struct srpt_recv_ioctx **) | |
2938 | srpt_alloc_ioctx_ring(sdev, sdev->srq_size, | |
2939 | sizeof(*sdev->ioctx_ring[0]), | |
2940 | srp_max_req_size, DMA_FROM_DEVICE); | |
2941 | if (!sdev->ioctx_ring) { | |
2942 | ib_destroy_srq(srq); | |
2943 | return -ENOMEM; | |
2944 | } | |
2945 | ||
2946 | sdev->use_srq = true; | |
2947 | sdev->srq = srq; | |
2948 | ||
fcf58936 BVA |
2949 | for (i = 0; i < sdev->srq_size; ++i) { |
2950 | INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list); | |
c76d7d64 | 2951 | srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]); |
fcf58936 | 2952 | } |
c76d7d64 BVA |
2953 | |
2954 | return 0; | |
2955 | } | |
2956 | ||
2957 | static int srpt_use_srq(struct srpt_device *sdev, bool use_srq) | |
2958 | { | |
2959 | struct ib_device *device = sdev->device; | |
2960 | int ret = 0; | |
2961 | ||
2962 | if (!use_srq) { | |
2963 | srpt_free_srq(sdev); | |
2964 | sdev->use_srq = false; | |
2965 | } else if (use_srq && !sdev->srq) { | |
2966 | ret = srpt_alloc_srq(sdev); | |
2967 | } | |
2968 | pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__, device->name, | |
2969 | sdev->use_srq, ret); | |
2970 | return ret; | |
2971 | } | |
2972 | ||
a42d985b | 2973 | /** |
10eac19b BVA |
2974 | * srpt_add_one - InfiniBand device addition callback function |
2975 | * @device: Describes a HCA. | |
a42d985b BVA |
2976 | */ |
2977 | static void srpt_add_one(struct ib_device *device) | |
2978 | { | |
2979 | struct srpt_device *sdev; | |
2980 | struct srpt_port *sport; | |
63cf1a90 | 2981 | int i, ret; |
a42d985b | 2982 | |
e3dfa60c | 2983 | pr_debug("device = %p\n", device); |
a42d985b | 2984 | |
e620ebfc BVA |
2985 | sdev = kzalloc(struct_size(sdev, port, device->phys_port_cnt), |
2986 | GFP_KERNEL); | |
a42d985b BVA |
2987 | if (!sdev) |
2988 | goto err; | |
2989 | ||
2990 | sdev->device = device; | |
ba60c84f | 2991 | mutex_init(&sdev->sdev_mutex); |
a42d985b | 2992 | |
ed082d36 | 2993 | sdev->pd = ib_alloc_pd(device, 0); |
a42d985b BVA |
2994 | if (IS_ERR(sdev->pd)) |
2995 | goto free_dev; | |
2996 | ||
74333f12 | 2997 | sdev->lkey = sdev->pd->local_dma_lkey; |
a42d985b | 2998 | |
4a061b28 | 2999 | sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr); |
a42d985b | 3000 | |
c76d7d64 | 3001 | srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq); |
a42d985b BVA |
3002 | |
3003 | if (!srpt_service_guid) | |
3004 | srpt_service_guid = be64_to_cpu(device->node_guid); | |
3005 | ||
63cf1a90 BVA |
3006 | if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND) |
3007 | sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev); | |
3008 | if (IS_ERR(sdev->cm_id)) { | |
3009 | pr_info("ib_create_cm_id() failed: %ld\n", | |
3010 | PTR_ERR(sdev->cm_id)); | |
3011 | sdev->cm_id = NULL; | |
3012 | if (!rdma_cm_id) | |
3013 | goto err_ring; | |
3014 | } | |
a42d985b BVA |
3015 | |
3016 | /* print out target login information */ | |
3017 | pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx," | |
3018 | "pkey=ffff,service_id=%016llx\n", srpt_service_guid, | |
3019 | srpt_service_guid, srpt_service_guid); | |
3020 | ||
3021 | /* | |
3022 | * We do not have a consistent service_id (ie. also id_ext of target_id) | |
3023 | * to identify this target. We currently use the guid of the first HCA | |
3024 | * in the system as service_id; therefore, the target_id will change | |
3025 | * if this HCA is gone bad and replaced by different HCA | |
3026 | */ | |
63cf1a90 BVA |
3027 | ret = sdev->cm_id ? |
3028 | ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0) : | |
3029 | 0; | |
3030 | if (ret < 0) { | |
3031 | pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret, | |
3032 | sdev->cm_id->state); | |
a42d985b | 3033 | goto err_cm; |
63cf1a90 | 3034 | } |
a42d985b BVA |
3035 | |
3036 | INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device, | |
3037 | srpt_event_handler); | |
dcc9881e | 3038 | ib_register_event_handler(&sdev->event_handler); |
a42d985b | 3039 | |
a42d985b BVA |
3040 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { |
3041 | sport = &sdev->port[i - 1]; | |
a1125314 | 3042 | INIT_LIST_HEAD(&sport->nexus_list); |
ba60c84f BVA |
3043 | init_waitqueue_head(&sport->ch_releaseQ); |
3044 | mutex_init(&sport->mutex); | |
a42d985b BVA |
3045 | sport->sdev = sdev; |
3046 | sport->port = i; | |
3047 | sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE; | |
3048 | sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE; | |
3049 | sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE; | |
dea26209 | 3050 | sport->port_attrib.use_srq = false; |
a42d985b | 3051 | INIT_WORK(&sport->work, srpt_refresh_port_work); |
a42d985b BVA |
3052 | |
3053 | if (srpt_refresh_port(sport)) { | |
9f5d32af | 3054 | pr_err("MAD registration failed for %s-%d.\n", |
f68cba4e | 3055 | sdev->device->name, i); |
dea26209 | 3056 | goto err_event; |
a42d985b | 3057 | } |
a42d985b BVA |
3058 | } |
3059 | ||
3060 | spin_lock(&srpt_dev_lock); | |
3061 | list_add_tail(&sdev->list, &srpt_dev_list); | |
3062 | spin_unlock(&srpt_dev_lock); | |
3063 | ||
3064 | out: | |
3065 | ib_set_client_data(device, &srpt_client, sdev); | |
3066 | pr_debug("added %s.\n", device->name); | |
3067 | return; | |
3068 | ||
a42d985b BVA |
3069 | err_event: |
3070 | ib_unregister_event_handler(&sdev->event_handler); | |
3071 | err_cm: | |
63cf1a90 BVA |
3072 | if (sdev->cm_id) |
3073 | ib_destroy_cm_id(sdev->cm_id); | |
dea26209 | 3074 | err_ring: |
c76d7d64 | 3075 | srpt_free_srq(sdev); |
a42d985b BVA |
3076 | ib_dealloc_pd(sdev->pd); |
3077 | free_dev: | |
3078 | kfree(sdev); | |
3079 | err: | |
3080 | sdev = NULL; | |
9f5d32af | 3081 | pr_info("%s(%s) failed.\n", __func__, device->name); |
a42d985b BVA |
3082 | goto out; |
3083 | } | |
3084 | ||
3085 | /** | |
10eac19b BVA |
3086 | * srpt_remove_one - InfiniBand device removal callback function |
3087 | * @device: Describes a HCA. | |
3088 | * @client_data: The value passed as the third argument to ib_set_client_data(). | |
a42d985b | 3089 | */ |
7c1eb45a | 3090 | static void srpt_remove_one(struct ib_device *device, void *client_data) |
a42d985b | 3091 | { |
7c1eb45a | 3092 | struct srpt_device *sdev = client_data; |
a42d985b BVA |
3093 | int i; |
3094 | ||
a42d985b | 3095 | if (!sdev) { |
9f5d32af | 3096 | pr_info("%s(%s): nothing to do.\n", __func__, device->name); |
a42d985b BVA |
3097 | return; |
3098 | } | |
3099 | ||
3100 | srpt_unregister_mad_agent(sdev); | |
3101 | ||
3102 | ib_unregister_event_handler(&sdev->event_handler); | |
3103 | ||
3104 | /* Cancel any work queued by the just unregistered IB event handler. */ | |
3105 | for (i = 0; i < sdev->device->phys_port_cnt; i++) | |
3106 | cancel_work_sync(&sdev->port[i].work); | |
3107 | ||
63cf1a90 BVA |
3108 | if (sdev->cm_id) |
3109 | ib_destroy_cm_id(sdev->cm_id); | |
3110 | ||
3111 | ib_set_client_data(device, &srpt_client, NULL); | |
a42d985b BVA |
3112 | |
3113 | /* | |
3114 | * Unregistering a target must happen after destroying sdev->cm_id | |
3115 | * such that no new SRP_LOGIN_REQ information units can arrive while | |
3116 | * destroying the target. | |
3117 | */ | |
3118 | spin_lock(&srpt_dev_lock); | |
3119 | list_del(&sdev->list); | |
3120 | spin_unlock(&srpt_dev_lock); | |
ba60c84f BVA |
3121 | |
3122 | for (i = 0; i < sdev->device->phys_port_cnt; i++) | |
3123 | srpt_release_sport(&sdev->port[i]); | |
a42d985b | 3124 | |
c76d7d64 BVA |
3125 | srpt_free_srq(sdev); |
3126 | ||
a42d985b BVA |
3127 | ib_dealloc_pd(sdev->pd); |
3128 | ||
a42d985b BVA |
3129 | kfree(sdev); |
3130 | } | |
3131 | ||
3132 | static struct ib_client srpt_client = { | |
3133 | .name = DRV_NAME, | |
3134 | .add = srpt_add_one, | |
3135 | .remove = srpt_remove_one | |
3136 | }; | |
3137 | ||
3138 | static int srpt_check_true(struct se_portal_group *se_tpg) | |
3139 | { | |
3140 | return 1; | |
3141 | } | |
3142 | ||
3143 | static int srpt_check_false(struct se_portal_group *se_tpg) | |
3144 | { | |
3145 | return 0; | |
3146 | } | |
3147 | ||
3148 | static char *srpt_get_fabric_name(void) | |
3149 | { | |
3150 | return "srpt"; | |
3151 | } | |
3152 | ||
2bce1a6d BVA |
3153 | static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg) |
3154 | { | |
3155 | return tpg->se_tpg_wwn->priv; | |
3156 | } | |
3157 | ||
a42d985b BVA |
3158 | static char *srpt_get_fabric_wwn(struct se_portal_group *tpg) |
3159 | { | |
2bce1a6d | 3160 | struct srpt_port *sport = srpt_tpg_to_sport(tpg); |
a42d985b | 3161 | |
2bce1a6d BVA |
3162 | WARN_ON_ONCE(tpg != &sport->port_guid_tpg && |
3163 | tpg != &sport->port_gid_tpg); | |
3164 | return tpg == &sport->port_guid_tpg ? sport->port_guid : | |
3165 | sport->port_gid; | |
a42d985b BVA |
3166 | } |
3167 | ||
3168 | static u16 srpt_get_tag(struct se_portal_group *tpg) | |
3169 | { | |
3170 | return 1; | |
3171 | } | |
3172 | ||
a42d985b BVA |
3173 | static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg) |
3174 | { | |
3175 | return 1; | |
3176 | } | |
3177 | ||
3178 | static void srpt_release_cmd(struct se_cmd *se_cmd) | |
3179 | { | |
9474b043 NB |
3180 | struct srpt_send_ioctx *ioctx = container_of(se_cmd, |
3181 | struct srpt_send_ioctx, cmd); | |
3182 | struct srpt_rdma_ch *ch = ioctx->ch; | |
3c968887 | 3183 | unsigned long flags; |
9474b043 | 3184 | |
bd2c52d7 BVA |
3185 | WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE && |
3186 | !(ioctx->cmd.transport_state & CMD_T_ABORTED)); | |
9474b043 | 3187 | |
b99f8e4d CH |
3188 | if (ioctx->n_rw_ctx) { |
3189 | srpt_free_rw_ctxs(ch, ioctx); | |
3190 | ioctx->n_rw_ctx = 0; | |
9474b043 NB |
3191 | } |
3192 | ||
3c968887 BVA |
3193 | spin_lock_irqsave(&ch->spinlock, flags); |
3194 | list_add(&ioctx->free_list, &ch->free_list); | |
3195 | spin_unlock_irqrestore(&ch->spinlock, flags); | |
a42d985b BVA |
3196 | } |
3197 | ||
a42d985b | 3198 | /** |
10eac19b BVA |
3199 | * srpt_close_session - forcibly close a session |
3200 | * @se_sess: SCSI target session. | |
a42d985b BVA |
3201 | * |
3202 | * Callback function invoked by the TCM core to clean up sessions associated | |
3203 | * with a node ACL when the user invokes | |
3204 | * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
3205 | */ | |
3206 | static void srpt_close_session(struct se_session *se_sess) | |
3207 | { | |
f108f0f6 | 3208 | struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr; |
a42d985b | 3209 | |
01b3ee13 | 3210 | srpt_disconnect_ch_sync(ch); |
a42d985b BVA |
3211 | } |
3212 | ||
a42d985b | 3213 | /** |
10eac19b BVA |
3214 | * srpt_sess_get_index - return the value of scsiAttIntrPortIndex (SCSI-MIB) |
3215 | * @se_sess: SCSI target session. | |
a42d985b BVA |
3216 | * |
3217 | * A quote from RFC 4455 (SCSI-MIB) about this MIB object: | |
3218 | * This object represents an arbitrary integer used to uniquely identify a | |
3219 | * particular attached remote initiator port to a particular SCSI target port | |
3220 | * within a particular SCSI target device within a particular SCSI instance. | |
3221 | */ | |
3222 | static u32 srpt_sess_get_index(struct se_session *se_sess) | |
3223 | { | |
3224 | return 0; | |
3225 | } | |
3226 | ||
3227 | static void srpt_set_default_node_attrs(struct se_node_acl *nacl) | |
3228 | { | |
3229 | } | |
3230 | ||
a42d985b BVA |
3231 | /* Note: only used from inside debug printk's by the TCM core. */ |
3232 | static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd) | |
3233 | { | |
3234 | struct srpt_send_ioctx *ioctx; | |
3235 | ||
3236 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
dd3bec86 | 3237 | return ioctx->state; |
a42d985b BVA |
3238 | } |
3239 | ||
2bce1a6d BVA |
3240 | static int srpt_parse_guid(u64 *guid, const char *name) |
3241 | { | |
3242 | u16 w[4]; | |
3243 | int ret = -EINVAL; | |
3244 | ||
3245 | if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4) | |
3246 | goto out; | |
3247 | *guid = get_unaligned_be64(w); | |
3248 | ret = 0; | |
3249 | out: | |
3250 | return ret; | |
3251 | } | |
3252 | ||
a42d985b | 3253 | /** |
10eac19b | 3254 | * srpt_parse_i_port_id - parse an initiator port ID |
a42d985b BVA |
3255 | * @name: ASCII representation of a 128-bit initiator port ID. |
3256 | * @i_port_id: Binary 128-bit port ID. | |
3257 | */ | |
3258 | static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name) | |
3259 | { | |
3260 | const char *p; | |
3261 | unsigned len, count, leading_zero_bytes; | |
c70ca389 | 3262 | int ret; |
a42d985b BVA |
3263 | |
3264 | p = name; | |
b60459f0 | 3265 | if (strncasecmp(p, "0x", 2) == 0) |
a42d985b BVA |
3266 | p += 2; |
3267 | ret = -EINVAL; | |
3268 | len = strlen(p); | |
3269 | if (len % 2) | |
3270 | goto out; | |
3271 | count = min(len / 2, 16U); | |
3272 | leading_zero_bytes = 16 - count; | |
3273 | memset(i_port_id, 0, leading_zero_bytes); | |
c70ca389 | 3274 | ret = hex2bin(i_port_id + leading_zero_bytes, p, count); |
63cf1a90 | 3275 | |
a42d985b BVA |
3276 | out: |
3277 | return ret; | |
3278 | } | |
3279 | ||
3280 | /* | |
63cf1a90 BVA |
3281 | * configfs callback function invoked for mkdir |
3282 | * /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
3283 | * | |
3284 | * i_port_id must be an initiator port GUID, GID or IP address. See also the | |
3285 | * target_alloc_session() calls in this driver. Examples of valid initiator | |
3286 | * port IDs: | |
3287 | * 0x0000000000000000505400fffe4a0b7b | |
3288 | * 0000000000000000505400fffe4a0b7b | |
3289 | * 5054:00ff:fe4a:0b7b | |
3290 | * 192.168.122.76 | |
a42d985b | 3291 | */ |
c7d6a803 | 3292 | static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name) |
a42d985b | 3293 | { |
63cf1a90 | 3294 | struct sockaddr_storage sa; |
2bce1a6d | 3295 | u64 guid; |
a42d985b | 3296 | u8 i_port_id[16]; |
2bce1a6d | 3297 | int ret; |
a42d985b | 3298 | |
2bce1a6d BVA |
3299 | ret = srpt_parse_guid(&guid, name); |
3300 | if (ret < 0) | |
3301 | ret = srpt_parse_i_port_id(i_port_id, name); | |
63cf1a90 BVA |
3302 | if (ret < 0) |
3303 | ret = inet_pton_with_scope(&init_net, AF_UNSPEC, name, NULL, | |
3304 | &sa); | |
2bce1a6d | 3305 | if (ret < 0) |
9f5d32af | 3306 | pr_err("invalid initiator port ID %s\n", name); |
2bce1a6d | 3307 | return ret; |
a42d985b BVA |
3308 | } |
3309 | ||
2eafd729 CH |
3310 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item, |
3311 | char *page) | |
a42d985b | 3312 | { |
2eafd729 | 3313 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3314 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3315 | |
3316 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size); | |
3317 | } | |
3318 | ||
2eafd729 CH |
3319 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item, |
3320 | const char *page, size_t count) | |
a42d985b | 3321 | { |
2eafd729 | 3322 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3323 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3324 | unsigned long val; |
3325 | int ret; | |
3326 | ||
9d8abf45 | 3327 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3328 | if (ret < 0) { |
9d8abf45 | 3329 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3330 | return -EINVAL; |
3331 | } | |
3332 | if (val > MAX_SRPT_RDMA_SIZE) { | |
3333 | pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val, | |
3334 | MAX_SRPT_RDMA_SIZE); | |
3335 | return -EINVAL; | |
3336 | } | |
3337 | if (val < DEFAULT_MAX_RDMA_SIZE) { | |
3338 | pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n", | |
3339 | val, DEFAULT_MAX_RDMA_SIZE); | |
3340 | return -EINVAL; | |
3341 | } | |
3342 | sport->port_attrib.srp_max_rdma_size = val; | |
3343 | ||
3344 | return count; | |
3345 | } | |
3346 | ||
2eafd729 CH |
3347 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item, |
3348 | char *page) | |
a42d985b | 3349 | { |
2eafd729 | 3350 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3351 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3352 | |
3353 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size); | |
3354 | } | |
3355 | ||
2eafd729 CH |
3356 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item, |
3357 | const char *page, size_t count) | |
a42d985b | 3358 | { |
2eafd729 | 3359 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3360 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3361 | unsigned long val; |
3362 | int ret; | |
3363 | ||
9d8abf45 | 3364 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3365 | if (ret < 0) { |
9d8abf45 | 3366 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3367 | return -EINVAL; |
3368 | } | |
3369 | if (val > MAX_SRPT_RSP_SIZE) { | |
3370 | pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val, | |
3371 | MAX_SRPT_RSP_SIZE); | |
3372 | return -EINVAL; | |
3373 | } | |
3374 | if (val < MIN_MAX_RSP_SIZE) { | |
3375 | pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val, | |
3376 | MIN_MAX_RSP_SIZE); | |
3377 | return -EINVAL; | |
3378 | } | |
3379 | sport->port_attrib.srp_max_rsp_size = val; | |
3380 | ||
3381 | return count; | |
3382 | } | |
3383 | ||
2eafd729 CH |
3384 | static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item, |
3385 | char *page) | |
a42d985b | 3386 | { |
2eafd729 | 3387 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3388 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3389 | |
3390 | return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size); | |
3391 | } | |
3392 | ||
2eafd729 CH |
3393 | static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item, |
3394 | const char *page, size_t count) | |
a42d985b | 3395 | { |
2eafd729 | 3396 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3397 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3398 | unsigned long val; |
3399 | int ret; | |
3400 | ||
9d8abf45 | 3401 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3402 | if (ret < 0) { |
9d8abf45 | 3403 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3404 | return -EINVAL; |
3405 | } | |
3406 | if (val > MAX_SRPT_SRQ_SIZE) { | |
3407 | pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val, | |
3408 | MAX_SRPT_SRQ_SIZE); | |
3409 | return -EINVAL; | |
3410 | } | |
3411 | if (val < MIN_SRPT_SRQ_SIZE) { | |
3412 | pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val, | |
3413 | MIN_SRPT_SRQ_SIZE); | |
3414 | return -EINVAL; | |
3415 | } | |
3416 | sport->port_attrib.srp_sq_size = val; | |
3417 | ||
3418 | return count; | |
3419 | } | |
3420 | ||
dea26209 BVA |
3421 | static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item, |
3422 | char *page) | |
3423 | { | |
3424 | struct se_portal_group *se_tpg = attrib_to_tpg(item); | |
3425 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); | |
3426 | ||
3427 | return sprintf(page, "%d\n", sport->port_attrib.use_srq); | |
3428 | } | |
3429 | ||
3430 | static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item, | |
3431 | const char *page, size_t count) | |
3432 | { | |
3433 | struct se_portal_group *se_tpg = attrib_to_tpg(item); | |
3434 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); | |
57b0c460 | 3435 | struct srpt_device *sdev = sport->sdev; |
dea26209 | 3436 | unsigned long val; |
57b0c460 | 3437 | bool enabled; |
dea26209 BVA |
3438 | int ret; |
3439 | ||
3440 | ret = kstrtoul(page, 0, &val); | |
3441 | if (ret < 0) | |
3442 | return ret; | |
3443 | if (val != !!val) | |
3444 | return -EINVAL; | |
57b0c460 | 3445 | |
ba60c84f | 3446 | ret = mutex_lock_interruptible(&sdev->sdev_mutex); |
57b0c460 BVA |
3447 | if (ret < 0) |
3448 | return ret; | |
ba60c84f BVA |
3449 | ret = mutex_lock_interruptible(&sport->mutex); |
3450 | if (ret < 0) | |
3451 | goto unlock_sdev; | |
57b0c460 BVA |
3452 | enabled = sport->enabled; |
3453 | /* Log out all initiator systems before changing 'use_srq'. */ | |
3454 | srpt_set_enabled(sport, false); | |
dea26209 | 3455 | sport->port_attrib.use_srq = val; |
57b0c460 BVA |
3456 | srpt_use_srq(sdev, sport->port_attrib.use_srq); |
3457 | srpt_set_enabled(sport, enabled); | |
ba60c84f BVA |
3458 | ret = count; |
3459 | mutex_unlock(&sport->mutex); | |
3460 | unlock_sdev: | |
3461 | mutex_unlock(&sdev->sdev_mutex); | |
dea26209 | 3462 | |
ba60c84f | 3463 | return ret; |
dea26209 BVA |
3464 | } |
3465 | ||
2eafd729 CH |
3466 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size); |
3467 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size); | |
3468 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size); | |
dea26209 | 3469 | CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq); |
a42d985b BVA |
3470 | |
3471 | static struct configfs_attribute *srpt_tpg_attrib_attrs[] = { | |
2eafd729 CH |
3472 | &srpt_tpg_attrib_attr_srp_max_rdma_size, |
3473 | &srpt_tpg_attrib_attr_srp_max_rsp_size, | |
3474 | &srpt_tpg_attrib_attr_srp_sq_size, | |
dea26209 | 3475 | &srpt_tpg_attrib_attr_use_srq, |
a42d985b BVA |
3476 | NULL, |
3477 | }; | |
3478 | ||
63cf1a90 BVA |
3479 | static struct rdma_cm_id *srpt_create_rdma_id(struct sockaddr *listen_addr) |
3480 | { | |
3481 | struct rdma_cm_id *rdma_cm_id; | |
3482 | int ret; | |
3483 | ||
3484 | rdma_cm_id = rdma_create_id(&init_net, srpt_rdma_cm_handler, | |
3485 | NULL, RDMA_PS_TCP, IB_QPT_RC); | |
3486 | if (IS_ERR(rdma_cm_id)) { | |
3487 | pr_err("RDMA/CM ID creation failed: %ld\n", | |
3488 | PTR_ERR(rdma_cm_id)); | |
3489 | goto out; | |
3490 | } | |
3491 | ||
3492 | ret = rdma_bind_addr(rdma_cm_id, listen_addr); | |
3493 | if (ret) { | |
3494 | char addr_str[64]; | |
3495 | ||
3496 | snprintf(addr_str, sizeof(addr_str), "%pISp", listen_addr); | |
3497 | pr_err("Binding RDMA/CM ID to address %s failed: %d\n", | |
3498 | addr_str, ret); | |
3499 | rdma_destroy_id(rdma_cm_id); | |
3500 | rdma_cm_id = ERR_PTR(ret); | |
3501 | goto out; | |
3502 | } | |
3503 | ||
3504 | ret = rdma_listen(rdma_cm_id, 128); | |
3505 | if (ret) { | |
3506 | pr_err("rdma_listen() failed: %d\n", ret); | |
3507 | rdma_destroy_id(rdma_cm_id); | |
3508 | rdma_cm_id = ERR_PTR(ret); | |
3509 | } | |
3510 | ||
3511 | out: | |
3512 | return rdma_cm_id; | |
3513 | } | |
3514 | ||
3515 | static ssize_t srpt_rdma_cm_port_show(struct config_item *item, char *page) | |
3516 | { | |
3517 | return sprintf(page, "%d\n", rdma_cm_port); | |
3518 | } | |
3519 | ||
3520 | static ssize_t srpt_rdma_cm_port_store(struct config_item *item, | |
3521 | const char *page, size_t count) | |
3522 | { | |
3523 | struct sockaddr_in addr4 = { .sin_family = AF_INET }; | |
3524 | struct sockaddr_in6 addr6 = { .sin6_family = AF_INET6 }; | |
3525 | struct rdma_cm_id *new_id = NULL; | |
3526 | u16 val; | |
3527 | int ret; | |
3528 | ||
3529 | ret = kstrtou16(page, 0, &val); | |
3530 | if (ret < 0) | |
3531 | return ret; | |
3532 | ret = count; | |
3533 | if (rdma_cm_port == val) | |
3534 | goto out; | |
3535 | ||
3536 | if (val) { | |
3537 | addr6.sin6_port = cpu_to_be16(val); | |
3538 | new_id = srpt_create_rdma_id((struct sockaddr *)&addr6); | |
3539 | if (IS_ERR(new_id)) { | |
3540 | addr4.sin_port = cpu_to_be16(val); | |
3541 | new_id = srpt_create_rdma_id((struct sockaddr *)&addr4); | |
3542 | if (IS_ERR(new_id)) { | |
3543 | ret = PTR_ERR(new_id); | |
3544 | goto out; | |
3545 | } | |
3546 | } | |
3547 | } | |
3548 | ||
3549 | mutex_lock(&rdma_cm_mutex); | |
3550 | rdma_cm_port = val; | |
3551 | swap(rdma_cm_id, new_id); | |
3552 | mutex_unlock(&rdma_cm_mutex); | |
3553 | ||
3554 | if (new_id) | |
3555 | rdma_destroy_id(new_id); | |
3556 | ret = count; | |
3557 | out: | |
3558 | return ret; | |
3559 | } | |
3560 | ||
3561 | CONFIGFS_ATTR(srpt_, rdma_cm_port); | |
3562 | ||
3563 | static struct configfs_attribute *srpt_da_attrs[] = { | |
3564 | &srpt_attr_rdma_cm_port, | |
3565 | NULL, | |
3566 | }; | |
3567 | ||
2eafd729 | 3568 | static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page) |
a42d985b | 3569 | { |
2eafd729 | 3570 | struct se_portal_group *se_tpg = to_tpg(item); |
2bce1a6d | 3571 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3572 | |
3573 | return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0); | |
3574 | } | |
3575 | ||
2eafd729 CH |
3576 | static ssize_t srpt_tpg_enable_store(struct config_item *item, |
3577 | const char *page, size_t count) | |
a42d985b | 3578 | { |
2eafd729 | 3579 | struct se_portal_group *se_tpg = to_tpg(item); |
2bce1a6d | 3580 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3581 | unsigned long tmp; |
3582 | int ret; | |
3583 | ||
9d8abf45 | 3584 | ret = kstrtoul(page, 0, &tmp); |
a42d985b | 3585 | if (ret < 0) { |
9f5d32af | 3586 | pr_err("Unable to extract srpt_tpg_store_enable\n"); |
a42d985b BVA |
3587 | return -EINVAL; |
3588 | } | |
3589 | ||
3590 | if ((tmp != 0) && (tmp != 1)) { | |
9f5d32af | 3591 | pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp); |
a42d985b BVA |
3592 | return -EINVAL; |
3593 | } | |
a42d985b | 3594 | |
ba60c84f | 3595 | mutex_lock(&sport->mutex); |
8b6dc529 | 3596 | srpt_set_enabled(sport, tmp); |
ba60c84f | 3597 | mutex_unlock(&sport->mutex); |
043a6806 | 3598 | |
a42d985b BVA |
3599 | return count; |
3600 | } | |
3601 | ||
2eafd729 | 3602 | CONFIGFS_ATTR(srpt_tpg_, enable); |
a42d985b BVA |
3603 | |
3604 | static struct configfs_attribute *srpt_tpg_attrs[] = { | |
2eafd729 | 3605 | &srpt_tpg_attr_enable, |
a42d985b BVA |
3606 | NULL, |
3607 | }; | |
3608 | ||
3609 | /** | |
10eac19b BVA |
3610 | * srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg |
3611 | * @wwn: Corresponds to $driver/$port. | |
10eac19b | 3612 | * @name: $tpg. |
a42d985b BVA |
3613 | */ |
3614 | static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn, | |
a42d985b BVA |
3615 | const char *name) |
3616 | { | |
2bce1a6d BVA |
3617 | struct srpt_port *sport = wwn->priv; |
3618 | static struct se_portal_group *tpg; | |
a42d985b BVA |
3619 | int res; |
3620 | ||
2bce1a6d BVA |
3621 | WARN_ON_ONCE(wwn != &sport->port_guid_wwn && |
3622 | wwn != &sport->port_gid_wwn); | |
3623 | tpg = wwn == &sport->port_guid_wwn ? &sport->port_guid_tpg : | |
3624 | &sport->port_gid_tpg; | |
3625 | res = core_tpg_register(wwn, tpg, SCSI_PROTOCOL_SRP); | |
a42d985b BVA |
3626 | if (res) |
3627 | return ERR_PTR(res); | |
3628 | ||
2bce1a6d | 3629 | return tpg; |
a42d985b BVA |
3630 | } |
3631 | ||
3632 | /** | |
10eac19b BVA |
3633 | * srpt_drop_tpg - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port/$tpg |
3634 | * @tpg: Target portal group to deregister. | |
a42d985b BVA |
3635 | */ |
3636 | static void srpt_drop_tpg(struct se_portal_group *tpg) | |
3637 | { | |
2bce1a6d | 3638 | struct srpt_port *sport = srpt_tpg_to_sport(tpg); |
a42d985b BVA |
3639 | |
3640 | sport->enabled = false; | |
2bce1a6d | 3641 | core_tpg_deregister(tpg); |
a42d985b BVA |
3642 | } |
3643 | ||
3644 | /** | |
10eac19b BVA |
3645 | * srpt_make_tport - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port |
3646 | * @tf: Not used. | |
3647 | * @group: Not used. | |
3648 | * @name: $port. | |
a42d985b BVA |
3649 | */ |
3650 | static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf, | |
3651 | struct config_group *group, | |
3652 | const char *name) | |
3653 | { | |
2bce1a6d | 3654 | return srpt_lookup_wwn(name) ? : ERR_PTR(-EINVAL); |
a42d985b BVA |
3655 | } |
3656 | ||
3657 | /** | |
10eac19b BVA |
3658 | * srpt_drop_tport - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port |
3659 | * @wwn: $port. | |
a42d985b BVA |
3660 | */ |
3661 | static void srpt_drop_tport(struct se_wwn *wwn) | |
3662 | { | |
a42d985b BVA |
3663 | } |
3664 | ||
2eafd729 | 3665 | static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf) |
a42d985b BVA |
3666 | { |
3667 | return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION); | |
3668 | } | |
3669 | ||
2eafd729 | 3670 | CONFIGFS_ATTR_RO(srpt_wwn_, version); |
a42d985b BVA |
3671 | |
3672 | static struct configfs_attribute *srpt_wwn_attrs[] = { | |
2eafd729 | 3673 | &srpt_wwn_attr_version, |
a42d985b BVA |
3674 | NULL, |
3675 | }; | |
3676 | ||
9ac8928e CH |
3677 | static const struct target_core_fabric_ops srpt_template = { |
3678 | .module = THIS_MODULE, | |
3679 | .name = "srpt", | |
a42d985b | 3680 | .get_fabric_name = srpt_get_fabric_name, |
a42d985b BVA |
3681 | .tpg_get_wwn = srpt_get_fabric_wwn, |
3682 | .tpg_get_tag = srpt_get_tag, | |
a42d985b BVA |
3683 | .tpg_check_demo_mode = srpt_check_false, |
3684 | .tpg_check_demo_mode_cache = srpt_check_true, | |
3685 | .tpg_check_demo_mode_write_protect = srpt_check_true, | |
3686 | .tpg_check_prod_mode_write_protect = srpt_check_false, | |
a42d985b BVA |
3687 | .tpg_get_inst_index = srpt_tpg_get_inst_index, |
3688 | .release_cmd = srpt_release_cmd, | |
3689 | .check_stop_free = srpt_check_stop_free, | |
a42d985b | 3690 | .close_session = srpt_close_session, |
a42d985b BVA |
3691 | .sess_get_index = srpt_sess_get_index, |
3692 | .sess_get_initiator_sid = NULL, | |
3693 | .write_pending = srpt_write_pending, | |
3694 | .write_pending_status = srpt_write_pending_status, | |
3695 | .set_default_node_attributes = srpt_set_default_node_attrs, | |
a42d985b | 3696 | .get_cmd_state = srpt_get_tcm_cmd_state, |
b79fafac | 3697 | .queue_data_in = srpt_queue_data_in, |
a42d985b | 3698 | .queue_status = srpt_queue_status, |
b79fafac | 3699 | .queue_tm_rsp = srpt_queue_tm_rsp, |
131e6abc | 3700 | .aborted_task = srpt_aborted_task, |
a42d985b BVA |
3701 | /* |
3702 | * Setup function pointers for generic logic in | |
3703 | * target_core_fabric_configfs.c | |
3704 | */ | |
3705 | .fabric_make_wwn = srpt_make_tport, | |
3706 | .fabric_drop_wwn = srpt_drop_tport, | |
3707 | .fabric_make_tpg = srpt_make_tpg, | |
3708 | .fabric_drop_tpg = srpt_drop_tpg, | |
c7d6a803 | 3709 | .fabric_init_nodeacl = srpt_init_nodeacl, |
9ac8928e | 3710 | |
63cf1a90 | 3711 | .tfc_discovery_attrs = srpt_da_attrs, |
9ac8928e CH |
3712 | .tfc_wwn_attrs = srpt_wwn_attrs, |
3713 | .tfc_tpg_base_attrs = srpt_tpg_attrs, | |
3714 | .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs, | |
a42d985b BVA |
3715 | }; |
3716 | ||
3717 | /** | |
10eac19b | 3718 | * srpt_init_module - kernel module initialization |
a42d985b BVA |
3719 | * |
3720 | * Note: Since ib_register_client() registers callback functions, and since at | |
3721 | * least one of these callback functions (srpt_add_one()) calls target core | |
3722 | * functions, this driver must be registered with the target core before | |
3723 | * ib_register_client() is called. | |
3724 | */ | |
3725 | static int __init srpt_init_module(void) | |
3726 | { | |
3727 | int ret; | |
3728 | ||
3729 | ret = -EINVAL; | |
3730 | if (srp_max_req_size < MIN_MAX_REQ_SIZE) { | |
9f5d32af | 3731 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3732 | " srp_max_req_size -- must be at least %d.\n", |
3733 | srp_max_req_size, MIN_MAX_REQ_SIZE); | |
3734 | goto out; | |
3735 | } | |
3736 | ||
3737 | if (srpt_srq_size < MIN_SRPT_SRQ_SIZE | |
3738 | || srpt_srq_size > MAX_SRPT_SRQ_SIZE) { | |
9f5d32af | 3739 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3740 | " srpt_srq_size -- must be in the range [%d..%d].\n", |
3741 | srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE); | |
3742 | goto out; | |
3743 | } | |
3744 | ||
9ac8928e CH |
3745 | ret = target_register_template(&srpt_template); |
3746 | if (ret) | |
a42d985b | 3747 | goto out; |
a42d985b BVA |
3748 | |
3749 | ret = ib_register_client(&srpt_client); | |
3750 | if (ret) { | |
9f5d32af | 3751 | pr_err("couldn't register IB client\n"); |
a42d985b BVA |
3752 | goto out_unregister_target; |
3753 | } | |
3754 | ||
3755 | return 0; | |
3756 | ||
3757 | out_unregister_target: | |
9ac8928e | 3758 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3759 | out: |
3760 | return ret; | |
3761 | } | |
3762 | ||
3763 | static void __exit srpt_cleanup_module(void) | |
3764 | { | |
63cf1a90 BVA |
3765 | if (rdma_cm_id) |
3766 | rdma_destroy_id(rdma_cm_id); | |
a42d985b | 3767 | ib_unregister_client(&srpt_client); |
9ac8928e | 3768 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3769 | } |
3770 | ||
3771 | module_init(srpt_init_module); | |
3772 | module_exit(srpt_cleanup_module); |