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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 | ||
55ee3ab2 MB |
578 | ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid, |
579 | NULL); | |
a42d985b BVA |
580 | if (ret) |
581 | goto err_query_port; | |
582 | ||
2bce1a6d | 583 | sport->port_guid_wwn.priv = sport; |
b14cb744 BVA |
584 | srpt_format_guid(sport->port_guid, sizeof(sport->port_guid), |
585 | &sport->gid.global.interface_id); | |
2bce1a6d BVA |
586 | sport->port_gid_wwn.priv = sport; |
587 | snprintf(sport->port_gid, sizeof(sport->port_gid), | |
588 | "0x%016llx%016llx", | |
589 | be64_to_cpu(sport->gid.global.subnet_prefix), | |
590 | be64_to_cpu(sport->gid.global.interface_id)); | |
716b076b | 591 | |
a42d985b | 592 | if (!sport->mad_agent) { |
9d2aa2b4 | 593 | memset(®_req, 0, sizeof(reg_req)); |
a42d985b BVA |
594 | reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT; |
595 | reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION; | |
596 | set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask); | |
597 | set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask); | |
598 | ||
599 | sport->mad_agent = ib_register_mad_agent(sport->sdev->device, | |
600 | sport->port, | |
601 | IB_QPT_GSI, | |
602 | ®_req, 0, | |
603 | srpt_mad_send_handler, | |
604 | srpt_mad_recv_handler, | |
0f29b46d | 605 | sport, 0); |
a42d985b BVA |
606 | if (IS_ERR(sport->mad_agent)) { |
607 | ret = PTR_ERR(sport->mad_agent); | |
608 | sport->mad_agent = NULL; | |
609 | goto err_query_port; | |
610 | } | |
611 | } | |
612 | ||
613 | return 0; | |
614 | ||
615 | err_query_port: | |
616 | ||
617 | port_modify.set_port_cap_mask = 0; | |
618 | port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP; | |
619 | ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify); | |
620 | ||
621 | err_mod_port: | |
622 | ||
623 | return ret; | |
624 | } | |
625 | ||
626 | /** | |
10eac19b BVA |
627 | * srpt_unregister_mad_agent - unregister MAD callback functions |
628 | * @sdev: SRPT HCA pointer. | |
a42d985b BVA |
629 | * |
630 | * Note: It is safe to call this function more than once for the same device. | |
631 | */ | |
632 | static void srpt_unregister_mad_agent(struct srpt_device *sdev) | |
633 | { | |
634 | struct ib_port_modify port_modify = { | |
635 | .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP, | |
636 | }; | |
637 | struct srpt_port *sport; | |
638 | int i; | |
639 | ||
640 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
641 | sport = &sdev->port[i - 1]; | |
642 | WARN_ON(sport->port != i); | |
643 | if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0) | |
9f5d32af | 644 | pr_err("disabling MAD processing failed.\n"); |
a42d985b BVA |
645 | if (sport->mad_agent) { |
646 | ib_unregister_mad_agent(sport->mad_agent); | |
647 | sport->mad_agent = NULL; | |
648 | } | |
649 | } | |
650 | } | |
651 | ||
652 | /** | |
10eac19b BVA |
653 | * srpt_alloc_ioctx - allocate a SRPT I/O context structure |
654 | * @sdev: SRPT HCA pointer. | |
655 | * @ioctx_size: I/O context size. | |
656 | * @dma_size: Size of I/O context DMA buffer. | |
657 | * @dir: DMA data direction. | |
a42d985b BVA |
658 | */ |
659 | static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev, | |
660 | int ioctx_size, int dma_size, | |
661 | enum dma_data_direction dir) | |
662 | { | |
663 | struct srpt_ioctx *ioctx; | |
664 | ||
665 | ioctx = kmalloc(ioctx_size, GFP_KERNEL); | |
666 | if (!ioctx) | |
667 | goto err; | |
668 | ||
669 | ioctx->buf = kmalloc(dma_size, GFP_KERNEL); | |
670 | if (!ioctx->buf) | |
671 | goto err_free_ioctx; | |
672 | ||
673 | ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir); | |
674 | if (ib_dma_mapping_error(sdev->device, ioctx->dma)) | |
675 | goto err_free_buf; | |
676 | ||
677 | return ioctx; | |
678 | ||
679 | err_free_buf: | |
680 | kfree(ioctx->buf); | |
681 | err_free_ioctx: | |
682 | kfree(ioctx); | |
683 | err: | |
684 | return NULL; | |
685 | } | |
686 | ||
687 | /** | |
10eac19b BVA |
688 | * srpt_free_ioctx - free a SRPT I/O context structure |
689 | * @sdev: SRPT HCA pointer. | |
690 | * @ioctx: I/O context pointer. | |
691 | * @dma_size: Size of I/O context DMA buffer. | |
692 | * @dir: DMA data direction. | |
a42d985b BVA |
693 | */ |
694 | static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx, | |
695 | int dma_size, enum dma_data_direction dir) | |
696 | { | |
697 | if (!ioctx) | |
698 | return; | |
699 | ||
700 | ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir); | |
701 | kfree(ioctx->buf); | |
702 | kfree(ioctx); | |
703 | } | |
704 | ||
705 | /** | |
10eac19b | 706 | * srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures |
a42d985b BVA |
707 | * @sdev: Device to allocate the I/O context ring for. |
708 | * @ring_size: Number of elements in the I/O context ring. | |
709 | * @ioctx_size: I/O context size. | |
710 | * @dma_size: DMA buffer size. | |
711 | * @dir: DMA data direction. | |
712 | */ | |
713 | static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev, | |
714 | int ring_size, int ioctx_size, | |
715 | int dma_size, enum dma_data_direction dir) | |
716 | { | |
717 | struct srpt_ioctx **ring; | |
718 | int i; | |
719 | ||
720 | WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) | |
721 | && ioctx_size != sizeof(struct srpt_send_ioctx)); | |
722 | ||
6da2ec56 | 723 | ring = kmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL); |
a42d985b BVA |
724 | if (!ring) |
725 | goto out; | |
726 | for (i = 0; i < ring_size; ++i) { | |
727 | ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir); | |
728 | if (!ring[i]) | |
729 | goto err; | |
730 | ring[i]->index = i; | |
731 | } | |
732 | goto out; | |
733 | ||
734 | err: | |
735 | while (--i >= 0) | |
736 | srpt_free_ioctx(sdev, ring[i], dma_size, dir); | |
737 | kfree(ring); | |
715252d4 | 738 | ring = NULL; |
a42d985b BVA |
739 | out: |
740 | return ring; | |
741 | } | |
742 | ||
743 | /** | |
10eac19b BVA |
744 | * srpt_free_ioctx_ring - free the ring of SRPT I/O context structures |
745 | * @ioctx_ring: I/O context ring to be freed. | |
746 | * @sdev: SRPT HCA pointer. | |
747 | * @ring_size: Number of ring elements. | |
748 | * @dma_size: Size of I/O context DMA buffer. | |
749 | * @dir: DMA data direction. | |
a42d985b BVA |
750 | */ |
751 | static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring, | |
752 | struct srpt_device *sdev, int ring_size, | |
753 | int dma_size, enum dma_data_direction dir) | |
754 | { | |
755 | int i; | |
756 | ||
dea26209 BVA |
757 | if (!ioctx_ring) |
758 | return; | |
759 | ||
a42d985b BVA |
760 | for (i = 0; i < ring_size; ++i) |
761 | srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir); | |
762 | kfree(ioctx_ring); | |
763 | } | |
764 | ||
a42d985b | 765 | /** |
10eac19b BVA |
766 | * srpt_set_cmd_state - set the state of a SCSI command |
767 | * @ioctx: Send I/O context. | |
768 | * @new: New I/O context state. | |
a42d985b BVA |
769 | * |
770 | * Does not modify the state of aborted commands. Returns the previous command | |
771 | * state. | |
772 | */ | |
773 | static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
774 | enum srpt_command_state new) | |
775 | { | |
776 | enum srpt_command_state previous; | |
a42d985b | 777 | |
a42d985b BVA |
778 | previous = ioctx->state; |
779 | if (previous != SRPT_STATE_DONE) | |
780 | ioctx->state = new; | |
a42d985b BVA |
781 | |
782 | return previous; | |
783 | } | |
784 | ||
785 | /** | |
10eac19b BVA |
786 | * srpt_test_and_set_cmd_state - test and set the state of a command |
787 | * @ioctx: Send I/O context. | |
788 | * @old: Current I/O context state. | |
789 | * @new: New I/O context state. | |
a42d985b BVA |
790 | * |
791 | * Returns true if and only if the previous command state was equal to 'old'. | |
792 | */ | |
793 | static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx, | |
794 | enum srpt_command_state old, | |
795 | enum srpt_command_state new) | |
796 | { | |
797 | enum srpt_command_state previous; | |
a42d985b BVA |
798 | |
799 | WARN_ON(!ioctx); | |
800 | WARN_ON(old == SRPT_STATE_DONE); | |
801 | WARN_ON(new == SRPT_STATE_NEW); | |
802 | ||
a42d985b BVA |
803 | previous = ioctx->state; |
804 | if (previous == old) | |
805 | ioctx->state = new; | |
2d67017c | 806 | |
a42d985b BVA |
807 | return previous == old; |
808 | } | |
809 | ||
810 | /** | |
10eac19b BVA |
811 | * srpt_post_recv - post an IB receive request |
812 | * @sdev: SRPT HCA pointer. | |
813 | * @ch: SRPT RDMA channel. | |
814 | * @ioctx: Receive I/O context pointer. | |
a42d985b | 815 | */ |
dea26209 | 816 | static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch, |
a42d985b BVA |
817 | struct srpt_recv_ioctx *ioctx) |
818 | { | |
819 | struct ib_sge list; | |
820 | struct ib_recv_wr wr, *bad_wr; | |
821 | ||
822 | BUG_ON(!sdev); | |
a42d985b BVA |
823 | list.addr = ioctx->ioctx.dma; |
824 | list.length = srp_max_req_size; | |
74333f12 | 825 | list.lkey = sdev->lkey; |
a42d985b | 826 | |
59fae4de CH |
827 | ioctx->ioctx.cqe.done = srpt_recv_done; |
828 | wr.wr_cqe = &ioctx->ioctx.cqe; | |
a42d985b BVA |
829 | wr.next = NULL; |
830 | wr.sg_list = &list; | |
831 | wr.num_sge = 1; | |
832 | ||
dea26209 BVA |
833 | if (sdev->use_srq) |
834 | return ib_post_srq_recv(sdev->srq, &wr, &bad_wr); | |
835 | else | |
836 | return ib_post_recv(ch->qp, &wr, &bad_wr); | |
a42d985b BVA |
837 | } |
838 | ||
aaf45bd8 | 839 | /** |
10eac19b BVA |
840 | * srpt_zerolength_write - perform a zero-length RDMA write |
841 | * @ch: SRPT RDMA channel. | |
aaf45bd8 BVA |
842 | * |
843 | * A quote from the InfiniBand specification: C9-88: For an HCA responder | |
844 | * using Reliable Connection service, for each zero-length RDMA READ or WRITE | |
845 | * request, the R_Key shall not be validated, even if the request includes | |
846 | * Immediate data. | |
847 | */ | |
848 | static int srpt_zerolength_write(struct srpt_rdma_ch *ch) | |
849 | { | |
2a78cb4d BVA |
850 | struct ib_send_wr *bad_wr; |
851 | struct ib_rdma_wr wr = { | |
852 | .wr = { | |
06892cc1 AM |
853 | .next = NULL, |
854 | { .wr_cqe = &ch->zw_cqe, }, | |
2a78cb4d | 855 | .opcode = IB_WR_RDMA_WRITE, |
2a78cb4d BVA |
856 | .send_flags = IB_SEND_SIGNALED, |
857 | } | |
858 | }; | |
aaf45bd8 | 859 | |
63d370a6 BVA |
860 | pr_debug("%s-%d: queued zerolength write\n", ch->sess_name, |
861 | ch->qp->qp_num); | |
862 | ||
2a78cb4d | 863 | return ib_post_send(ch->qp, &wr.wr, &bad_wr); |
aaf45bd8 BVA |
864 | } |
865 | ||
866 | static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc) | |
867 | { | |
868 | struct srpt_rdma_ch *ch = cq->cq_context; | |
869 | ||
63d370a6 BVA |
870 | pr_debug("%s-%d wc->status %d\n", ch->sess_name, ch->qp->qp_num, |
871 | wc->status); | |
872 | ||
387add46 BVA |
873 | if (wc->status == IB_WC_SUCCESS) { |
874 | srpt_process_wait_list(ch); | |
875 | } else { | |
876 | if (srpt_set_ch_state(ch, CH_DISCONNECTED)) | |
877 | schedule_work(&ch->release_work); | |
878 | else | |
ea51d2e1 BVA |
879 | pr_debug("%s-%d: already disconnected.\n", |
880 | ch->sess_name, ch->qp->qp_num); | |
387add46 | 881 | } |
aaf45bd8 BVA |
882 | } |
883 | ||
b99f8e4d CH |
884 | static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx, |
885 | struct srp_direct_buf *db, int nbufs, struct scatterlist **sg, | |
886 | unsigned *sg_cnt) | |
887 | { | |
888 | enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd); | |
889 | struct srpt_rdma_ch *ch = ioctx->ch; | |
890 | struct scatterlist *prev = NULL; | |
891 | unsigned prev_nents; | |
892 | int ret, i; | |
893 | ||
894 | if (nbufs == 1) { | |
895 | ioctx->rw_ctxs = &ioctx->s_rw_ctx; | |
896 | } else { | |
897 | ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs), | |
898 | GFP_KERNEL); | |
899 | if (!ioctx->rw_ctxs) | |
900 | return -ENOMEM; | |
901 | } | |
902 | ||
903 | for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) { | |
904 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
905 | u64 remote_addr = be64_to_cpu(db->va); | |
906 | u32 size = be32_to_cpu(db->len); | |
907 | u32 rkey = be32_to_cpu(db->key); | |
908 | ||
909 | ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false, | |
910 | i < nbufs - 1); | |
911 | if (ret) | |
912 | goto unwind; | |
913 | ||
914 | ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port, | |
915 | ctx->sg, ctx->nents, 0, remote_addr, rkey, dir); | |
916 | if (ret < 0) { | |
917 | target_free_sgl(ctx->sg, ctx->nents); | |
918 | goto unwind; | |
919 | } | |
920 | ||
921 | ioctx->n_rdma += ret; | |
922 | ioctx->n_rw_ctx++; | |
923 | ||
924 | if (prev) { | |
925 | sg_unmark_end(&prev[prev_nents - 1]); | |
926 | sg_chain(prev, prev_nents + 1, ctx->sg); | |
927 | } else { | |
928 | *sg = ctx->sg; | |
929 | } | |
930 | ||
931 | prev = ctx->sg; | |
932 | prev_nents = ctx->nents; | |
933 | ||
934 | *sg_cnt += ctx->nents; | |
935 | } | |
936 | ||
937 | return 0; | |
938 | ||
939 | unwind: | |
940 | while (--i >= 0) { | |
941 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
942 | ||
943 | rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port, | |
944 | ctx->sg, ctx->nents, dir); | |
945 | target_free_sgl(ctx->sg, ctx->nents); | |
946 | } | |
947 | if (ioctx->rw_ctxs != &ioctx->s_rw_ctx) | |
948 | kfree(ioctx->rw_ctxs); | |
949 | return ret; | |
950 | } | |
951 | ||
952 | static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch, | |
953 | struct srpt_send_ioctx *ioctx) | |
954 | { | |
955 | enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd); | |
956 | int i; | |
957 | ||
958 | for (i = 0; i < ioctx->n_rw_ctx; i++) { | |
959 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
960 | ||
961 | rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port, | |
962 | ctx->sg, ctx->nents, dir); | |
963 | target_free_sgl(ctx->sg, ctx->nents); | |
964 | } | |
965 | ||
966 | if (ioctx->rw_ctxs != &ioctx->s_rw_ctx) | |
967 | kfree(ioctx->rw_ctxs); | |
968 | } | |
969 | ||
970 | static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd) | |
971 | { | |
972 | /* | |
973 | * The pointer computations below will only be compiled correctly | |
974 | * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check | |
975 | * whether srp_cmd::add_data has been declared as a byte pointer. | |
976 | */ | |
977 | BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) && | |
978 | !__same_type(srp_cmd->add_data[0], (u8)0)); | |
979 | ||
980 | /* | |
981 | * According to the SRP spec, the lower two bits of the 'ADDITIONAL | |
982 | * CDB LENGTH' field are reserved and the size in bytes of this field | |
983 | * is four times the value specified in bits 3..7. Hence the "& ~3". | |
984 | */ | |
985 | return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3); | |
986 | } | |
987 | ||
a42d985b | 988 | /** |
10eac19b | 989 | * srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request |
a42d985b BVA |
990 | * @ioctx: Pointer to the I/O context associated with the request. |
991 | * @srp_cmd: Pointer to the SRP_CMD request data. | |
992 | * @dir: Pointer to the variable to which the transfer direction will be | |
993 | * written. | |
10eac19b BVA |
994 | * @sg: [out] scatterlist allocated for the parsed SRP_CMD. |
995 | * @sg_cnt: [out] length of @sg. | |
a42d985b BVA |
996 | * @data_len: Pointer to the variable to which the total data length of all |
997 | * descriptors in the SRP_CMD request will be written. | |
998 | * | |
999 | * This function initializes ioctx->nrbuf and ioctx->r_bufs. | |
1000 | * | |
1001 | * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors; | |
1002 | * -ENOMEM when memory allocation fails and zero upon success. | |
1003 | */ | |
1004 | static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx, | |
b99f8e4d CH |
1005 | struct srp_cmd *srp_cmd, enum dma_data_direction *dir, |
1006 | struct scatterlist **sg, unsigned *sg_cnt, u64 *data_len) | |
a42d985b | 1007 | { |
a42d985b BVA |
1008 | BUG_ON(!dir); |
1009 | BUG_ON(!data_len); | |
1010 | ||
a42d985b BVA |
1011 | /* |
1012 | * The lower four bits of the buffer format field contain the DATA-IN | |
1013 | * buffer descriptor format, and the highest four bits contain the | |
1014 | * DATA-OUT buffer descriptor format. | |
1015 | */ | |
a42d985b BVA |
1016 | if (srp_cmd->buf_fmt & 0xf) |
1017 | /* DATA-IN: transfer data from target to initiator (read). */ | |
1018 | *dir = DMA_FROM_DEVICE; | |
1019 | else if (srp_cmd->buf_fmt >> 4) | |
1020 | /* DATA-OUT: transfer data from initiator to target (write). */ | |
1021 | *dir = DMA_TO_DEVICE; | |
b99f8e4d CH |
1022 | else |
1023 | *dir = DMA_NONE; | |
1024 | ||
1025 | /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */ | |
1026 | ioctx->cmd.data_direction = *dir; | |
a42d985b | 1027 | |
a42d985b BVA |
1028 | if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) || |
1029 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) { | |
b99f8e4d | 1030 | struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd); |
a42d985b | 1031 | |
a42d985b | 1032 | *data_len = be32_to_cpu(db->len); |
b99f8e4d | 1033 | return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt); |
a42d985b BVA |
1034 | } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) || |
1035 | ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) { | |
b99f8e4d CH |
1036 | struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd); |
1037 | int nbufs = be32_to_cpu(idb->table_desc.len) / | |
1038 | sizeof(struct srp_direct_buf); | |
a42d985b | 1039 | |
b99f8e4d | 1040 | if (nbufs > |
a42d985b | 1041 | (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) { |
9f5d32af | 1042 | pr_err("received unsupported SRP_CMD request" |
a42d985b BVA |
1043 | " type (%u out + %u in != %u / %zu)\n", |
1044 | srp_cmd->data_out_desc_cnt, | |
1045 | srp_cmd->data_in_desc_cnt, | |
1046 | be32_to_cpu(idb->table_desc.len), | |
b99f8e4d CH |
1047 | sizeof(struct srp_direct_buf)); |
1048 | return -EINVAL; | |
a42d985b BVA |
1049 | } |
1050 | ||
a42d985b | 1051 | *data_len = be32_to_cpu(idb->len); |
b99f8e4d CH |
1052 | return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs, |
1053 | sg, sg_cnt); | |
1054 | } else { | |
1055 | *data_len = 0; | |
1056 | return 0; | |
a42d985b | 1057 | } |
a42d985b BVA |
1058 | } |
1059 | ||
1060 | /** | |
10eac19b BVA |
1061 | * srpt_init_ch_qp - initialize queue pair attributes |
1062 | * @ch: SRPT RDMA channel. | |
1063 | * @qp: Queue pair pointer. | |
a42d985b BVA |
1064 | * |
1065 | * Initialized the attributes of queue pair 'qp' by allowing local write, | |
1066 | * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT. | |
1067 | */ | |
1068 | static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1069 | { | |
1070 | struct ib_qp_attr *attr; | |
1071 | int ret; | |
1072 | ||
63cf1a90 BVA |
1073 | WARN_ON_ONCE(ch->using_rdma_cm); |
1074 | ||
9d2aa2b4 | 1075 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
a42d985b BVA |
1076 | if (!attr) |
1077 | return -ENOMEM; | |
1078 | ||
1079 | attr->qp_state = IB_QPS_INIT; | |
bec40c26 | 1080 | attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE; |
a42d985b | 1081 | attr->port_num = ch->sport->port; |
c5efb621 BVA |
1082 | |
1083 | ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port, | |
1084 | ch->pkey, &attr->pkey_index); | |
1085 | if (ret < 0) | |
1086 | pr_err("Translating pkey %#x failed (%d) - using index 0\n", | |
1087 | ch->pkey, ret); | |
a42d985b BVA |
1088 | |
1089 | ret = ib_modify_qp(qp, attr, | |
1090 | IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT | | |
1091 | IB_QP_PKEY_INDEX); | |
1092 | ||
1093 | kfree(attr); | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1097 | /** | |
10eac19b | 1098 | * srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR) |
a42d985b BVA |
1099 | * @ch: channel of the queue pair. |
1100 | * @qp: queue pair to change the state of. | |
1101 | * | |
1102 | * Returns zero upon success and a negative value upon failure. | |
1103 | * | |
1104 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
1105 | * If this structure ever becomes larger, it might be necessary to allocate | |
1106 | * it dynamically instead of on the stack. | |
1107 | */ | |
1108 | static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1109 | { | |
1110 | struct ib_qp_attr qp_attr; | |
1111 | int attr_mask; | |
1112 | int ret; | |
1113 | ||
63cf1a90 BVA |
1114 | WARN_ON_ONCE(ch->using_rdma_cm); |
1115 | ||
a42d985b | 1116 | qp_attr.qp_state = IB_QPS_RTR; |
090fa24b | 1117 | ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask); |
a42d985b BVA |
1118 | if (ret) |
1119 | goto out; | |
1120 | ||
1121 | qp_attr.max_dest_rd_atomic = 4; | |
1122 | ||
1123 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
1124 | ||
1125 | out: | |
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | /** | |
10eac19b | 1130 | * srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS) |
a42d985b BVA |
1131 | * @ch: channel of the queue pair. |
1132 | * @qp: queue pair to change the state of. | |
1133 | * | |
1134 | * Returns zero upon success and a negative value upon failure. | |
1135 | * | |
1136 | * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system. | |
1137 | * If this structure ever becomes larger, it might be necessary to allocate | |
1138 | * it dynamically instead of on the stack. | |
1139 | */ | |
1140 | static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp) | |
1141 | { | |
1142 | struct ib_qp_attr qp_attr; | |
1143 | int attr_mask; | |
1144 | int ret; | |
1145 | ||
1146 | qp_attr.qp_state = IB_QPS_RTS; | |
090fa24b | 1147 | ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask); |
a42d985b BVA |
1148 | if (ret) |
1149 | goto out; | |
1150 | ||
1151 | qp_attr.max_rd_atomic = 4; | |
1152 | ||
1153 | ret = ib_modify_qp(qp, &qp_attr, attr_mask); | |
1154 | ||
1155 | out: | |
1156 | return ret; | |
1157 | } | |
1158 | ||
1159 | /** | |
10eac19b BVA |
1160 | * srpt_ch_qp_err - set the channel queue pair state to 'error' |
1161 | * @ch: SRPT RDMA channel. | |
a42d985b BVA |
1162 | */ |
1163 | static int srpt_ch_qp_err(struct srpt_rdma_ch *ch) | |
1164 | { | |
1165 | struct ib_qp_attr qp_attr; | |
1166 | ||
1167 | qp_attr.qp_state = IB_QPS_ERR; | |
1168 | return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE); | |
1169 | } | |
1170 | ||
a42d985b | 1171 | /** |
10eac19b BVA |
1172 | * srpt_get_send_ioctx - obtain an I/O context for sending to the initiator |
1173 | * @ch: SRPT RDMA channel. | |
a42d985b BVA |
1174 | */ |
1175 | static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch) | |
1176 | { | |
1177 | struct srpt_send_ioctx *ioctx; | |
3c968887 | 1178 | unsigned long flags; |
a42d985b BVA |
1179 | |
1180 | BUG_ON(!ch); | |
1181 | ||
3c968887 BVA |
1182 | ioctx = NULL; |
1183 | spin_lock_irqsave(&ch->spinlock, flags); | |
1184 | if (!list_empty(&ch->free_list)) { | |
1185 | ioctx = list_first_entry(&ch->free_list, | |
1186 | struct srpt_send_ioctx, free_list); | |
1187 | list_del(&ioctx->free_list); | |
a42d985b | 1188 | } |
3c968887 BVA |
1189 | spin_unlock_irqrestore(&ch->spinlock, flags); |
1190 | ||
1191 | if (!ioctx) | |
1192 | return ioctx; | |
1193 | ||
1194 | BUG_ON(ioctx->ch != ch); | |
a42d985b | 1195 | ioctx->state = SRPT_STATE_NEW; |
3c968887 | 1196 | ioctx->n_rdma = 0; |
b99f8e4d | 1197 | ioctx->n_rw_ctx = 0; |
3c968887 BVA |
1198 | ioctx->queue_status_only = false; |
1199 | /* | |
1200 | * transport_init_se_cmd() does not initialize all fields, so do it | |
1201 | * here. | |
1202 | */ | |
1203 | memset(&ioctx->cmd, 0, sizeof(ioctx->cmd)); | |
1204 | memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data)); | |
a42d985b BVA |
1205 | |
1206 | return ioctx; | |
1207 | } | |
1208 | ||
a42d985b | 1209 | /** |
10eac19b | 1210 | * srpt_abort_cmd - abort a SCSI command |
a42d985b | 1211 | * @ioctx: I/O context associated with the SCSI command. |
a42d985b BVA |
1212 | */ |
1213 | static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx) | |
1214 | { | |
1215 | enum srpt_command_state state; | |
a42d985b BVA |
1216 | |
1217 | BUG_ON(!ioctx); | |
1218 | ||
1219 | /* | |
1220 | * If the command is in a state where the target core is waiting for | |
49f40163 | 1221 | * the ib_srpt driver, change the state to the next state. |
a42d985b BVA |
1222 | */ |
1223 | ||
a42d985b BVA |
1224 | state = ioctx->state; |
1225 | switch (state) { | |
1226 | case SRPT_STATE_NEED_DATA: | |
1227 | ioctx->state = SRPT_STATE_DATA_IN; | |
1228 | break; | |
a42d985b BVA |
1229 | case SRPT_STATE_CMD_RSP_SENT: |
1230 | case SRPT_STATE_MGMT_RSP_SENT: | |
1231 | ioctx->state = SRPT_STATE_DONE; | |
1232 | break; | |
1233 | default: | |
49f40163 BVA |
1234 | WARN_ONCE(true, "%s: unexpected I/O context state %d\n", |
1235 | __func__, state); | |
a42d985b BVA |
1236 | break; |
1237 | } | |
a42d985b | 1238 | |
13fdd445 BVA |
1239 | pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state, |
1240 | ioctx->state, ioctx->cmd.tag); | |
a42d985b BVA |
1241 | |
1242 | switch (state) { | |
1243 | case SRPT_STATE_NEW: | |
1244 | case SRPT_STATE_DATA_IN: | |
1245 | case SRPT_STATE_MGMT: | |
49f40163 | 1246 | case SRPT_STATE_DONE: |
a42d985b BVA |
1247 | /* |
1248 | * Do nothing - defer abort processing until | |
1249 | * srpt_queue_response() is invoked. | |
1250 | */ | |
a42d985b BVA |
1251 | break; |
1252 | case SRPT_STATE_NEED_DATA: | |
49f40163 BVA |
1253 | pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag); |
1254 | transport_generic_request_failure(&ioctx->cmd, | |
1255 | TCM_CHECK_CONDITION_ABORT_CMD); | |
a42d985b BVA |
1256 | break; |
1257 | case SRPT_STATE_CMD_RSP_SENT: | |
1258 | /* | |
1259 | * SRP_RSP sending failed or the SRP_RSP send completion has | |
1260 | * not been received in time. | |
1261 | */ | |
49f40163 | 1262 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1263 | break; |
1264 | case SRPT_STATE_MGMT_RSP_SENT: | |
49f40163 | 1265 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b BVA |
1266 | break; |
1267 | default: | |
532ec6f1 | 1268 | WARN(1, "Unexpected command state (%d)", state); |
a42d985b BVA |
1269 | break; |
1270 | } | |
1271 | ||
a42d985b BVA |
1272 | return state; |
1273 | } | |
1274 | ||
1275 | /** | |
10eac19b BVA |
1276 | * srpt_rdma_read_done - RDMA read completion callback |
1277 | * @cq: Completion queue. | |
1278 | * @wc: Work completion. | |
1279 | * | |
e672a47f CH |
1280 | * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping |
1281 | * the data that has been transferred via IB RDMA had to be postponed until the | |
142ad5db | 1282 | * check_stop_free() callback. None of this is necessary anymore and needs to |
e672a47f | 1283 | * be cleaned up. |
a42d985b | 1284 | */ |
59fae4de | 1285 | static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1286 | { |
59fae4de CH |
1287 | struct srpt_rdma_ch *ch = cq->cq_context; |
1288 | struct srpt_send_ioctx *ioctx = | |
19f57298 | 1289 | container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe); |
59fae4de | 1290 | |
a42d985b BVA |
1291 | WARN_ON(ioctx->n_rdma <= 0); |
1292 | atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); | |
b99f8e4d | 1293 | ioctx->n_rdma = 0; |
a42d985b | 1294 | |
59fae4de CH |
1295 | if (unlikely(wc->status != IB_WC_SUCCESS)) { |
1296 | pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n", | |
1297 | ioctx, wc->status); | |
1298 | srpt_abort_cmd(ioctx); | |
1299 | return; | |
a42d985b | 1300 | } |
59fae4de CH |
1301 | |
1302 | if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA, | |
1303 | SRPT_STATE_DATA_IN)) | |
1304 | target_execute_cmd(&ioctx->cmd); | |
1305 | else | |
1306 | pr_err("%s[%d]: wrong state = %d\n", __func__, | |
dd3bec86 | 1307 | __LINE__, ioctx->state); |
a42d985b BVA |
1308 | } |
1309 | ||
a42d985b | 1310 | /** |
10eac19b | 1311 | * srpt_build_cmd_rsp - build a SRP_RSP response |
a42d985b BVA |
1312 | * @ch: RDMA channel through which the request has been received. |
1313 | * @ioctx: I/O context associated with the SRP_CMD request. The response will | |
1314 | * be built in the buffer ioctx->buf points at and hence this function will | |
1315 | * overwrite the request data. | |
1316 | * @tag: tag of the request for which this response is being generated. | |
1317 | * @status: value for the STATUS field of the SRP_RSP information unit. | |
1318 | * | |
1319 | * Returns the size in bytes of the SRP_RSP response. | |
1320 | * | |
1321 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1322 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1323 | * response. See also SPC-2 for more information about sense data. | |
1324 | */ | |
1325 | static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch, | |
1326 | struct srpt_send_ioctx *ioctx, u64 tag, | |
1327 | int status) | |
1328 | { | |
1329 | struct srp_rsp *srp_rsp; | |
1330 | const u8 *sense_data; | |
1331 | int sense_data_len, max_sense_len; | |
1332 | ||
1333 | /* | |
1334 | * The lowest bit of all SAM-3 status codes is zero (see also | |
1335 | * paragraph 5.3 in SAM-3). | |
1336 | */ | |
1337 | WARN_ON(status & 1); | |
1338 | ||
1339 | srp_rsp = ioctx->ioctx.buf; | |
1340 | BUG_ON(!srp_rsp); | |
1341 | ||
1342 | sense_data = ioctx->sense_data; | |
1343 | sense_data_len = ioctx->cmd.scsi_sense_length; | |
1344 | WARN_ON(sense_data_len > sizeof(ioctx->sense_data)); | |
1345 | ||
9d2aa2b4 | 1346 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1347 | srp_rsp->opcode = SRP_RSP; |
1348 | srp_rsp->req_lim_delta = | |
b356c1c1 | 1349 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); |
a42d985b BVA |
1350 | srp_rsp->tag = tag; |
1351 | srp_rsp->status = status; | |
1352 | ||
1353 | if (sense_data_len) { | |
1354 | BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp)); | |
1355 | max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp); | |
1356 | if (sense_data_len > max_sense_len) { | |
9f5d32af DL |
1357 | pr_warn("truncated sense data from %d to %d" |
1358 | " bytes\n", sense_data_len, max_sense_len); | |
a42d985b BVA |
1359 | sense_data_len = max_sense_len; |
1360 | } | |
1361 | ||
1362 | srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
1363 | srp_rsp->sense_data_len = cpu_to_be32(sense_data_len); | |
1364 | memcpy(srp_rsp + 1, sense_data, sense_data_len); | |
1365 | } | |
1366 | ||
1367 | return sizeof(*srp_rsp) + sense_data_len; | |
1368 | } | |
1369 | ||
1370 | /** | |
10eac19b | 1371 | * srpt_build_tskmgmt_rsp - build a task management response |
a42d985b BVA |
1372 | * @ch: RDMA channel through which the request has been received. |
1373 | * @ioctx: I/O context in which the SRP_RSP response will be built. | |
1374 | * @rsp_code: RSP_CODE that will be stored in the response. | |
1375 | * @tag: Tag of the request for which this response is being generated. | |
1376 | * | |
1377 | * Returns the size in bytes of the SRP_RSP response. | |
1378 | * | |
1379 | * An SRP_RSP response contains a SCSI status or service response. See also | |
1380 | * section 6.9 in the SRP r16a document for the format of an SRP_RSP | |
1381 | * response. | |
1382 | */ | |
1383 | static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch, | |
1384 | struct srpt_send_ioctx *ioctx, | |
1385 | u8 rsp_code, u64 tag) | |
1386 | { | |
1387 | struct srp_rsp *srp_rsp; | |
1388 | int resp_data_len; | |
1389 | int resp_len; | |
1390 | ||
c807f643 | 1391 | resp_data_len = 4; |
a42d985b BVA |
1392 | resp_len = sizeof(*srp_rsp) + resp_data_len; |
1393 | ||
1394 | srp_rsp = ioctx->ioctx.buf; | |
1395 | BUG_ON(!srp_rsp); | |
9d2aa2b4 | 1396 | memset(srp_rsp, 0, sizeof(*srp_rsp)); |
a42d985b BVA |
1397 | |
1398 | srp_rsp->opcode = SRP_RSP; | |
b356c1c1 VT |
1399 | srp_rsp->req_lim_delta = |
1400 | cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0)); | |
a42d985b BVA |
1401 | srp_rsp->tag = tag; |
1402 | ||
c807f643 JW |
1403 | srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID; |
1404 | srp_rsp->resp_data_len = cpu_to_be32(resp_data_len); | |
1405 | srp_rsp->data[3] = rsp_code; | |
a42d985b BVA |
1406 | |
1407 | return resp_len; | |
1408 | } | |
1409 | ||
a42d985b BVA |
1410 | static int srpt_check_stop_free(struct se_cmd *cmd) |
1411 | { | |
9474b043 NB |
1412 | struct srpt_send_ioctx *ioctx = container_of(cmd, |
1413 | struct srpt_send_ioctx, cmd); | |
a42d985b | 1414 | |
afc16604 | 1415 | return target_put_sess_cmd(&ioctx->cmd); |
a42d985b BVA |
1416 | } |
1417 | ||
1418 | /** | |
10eac19b BVA |
1419 | * srpt_handle_cmd - process a SRP_CMD information unit |
1420 | * @ch: SRPT RDMA channel. | |
1421 | * @recv_ioctx: Receive I/O context. | |
1422 | * @send_ioctx: Send I/O context. | |
a42d985b | 1423 | */ |
2c7f37ff BVA |
1424 | static void srpt_handle_cmd(struct srpt_rdma_ch *ch, |
1425 | struct srpt_recv_ioctx *recv_ioctx, | |
1426 | struct srpt_send_ioctx *send_ioctx) | |
a42d985b BVA |
1427 | { |
1428 | struct se_cmd *cmd; | |
1429 | struct srp_cmd *srp_cmd; | |
b99f8e4d CH |
1430 | struct scatterlist *sg = NULL; |
1431 | unsigned sg_cnt = 0; | |
a42d985b BVA |
1432 | u64 data_len; |
1433 | enum dma_data_direction dir; | |
9474b043 | 1434 | int rc; |
a42d985b BVA |
1435 | |
1436 | BUG_ON(!send_ioctx); | |
1437 | ||
1438 | srp_cmd = recv_ioctx->ioctx.buf; | |
a42d985b | 1439 | cmd = &send_ioctx->cmd; |
649ee054 | 1440 | cmd->tag = srp_cmd->tag; |
a42d985b BVA |
1441 | |
1442 | switch (srp_cmd->task_attr) { | |
1443 | case SRP_CMD_SIMPLE_Q: | |
68d81f40 | 1444 | cmd->sam_task_attr = TCM_SIMPLE_TAG; |
a42d985b BVA |
1445 | break; |
1446 | case SRP_CMD_ORDERED_Q: | |
1447 | default: | |
68d81f40 | 1448 | cmd->sam_task_attr = TCM_ORDERED_TAG; |
a42d985b BVA |
1449 | break; |
1450 | case SRP_CMD_HEAD_OF_Q: | |
68d81f40 | 1451 | cmd->sam_task_attr = TCM_HEAD_TAG; |
a42d985b BVA |
1452 | break; |
1453 | case SRP_CMD_ACA: | |
68d81f40 | 1454 | cmd->sam_task_attr = TCM_ACA_TAG; |
a42d985b BVA |
1455 | break; |
1456 | } | |
1457 | ||
b99f8e4d CH |
1458 | rc = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &sg, &sg_cnt, |
1459 | &data_len); | |
1460 | if (rc) { | |
1461 | if (rc != -EAGAIN) { | |
1462 | pr_err("0x%llx: parsing SRP descriptor table failed.\n", | |
1463 | srp_cmd->tag); | |
1464 | } | |
2c7f37ff | 1465 | goto release_ioctx; |
a42d985b BVA |
1466 | } |
1467 | ||
b99f8e4d | 1468 | rc = target_submit_cmd_map_sgls(cmd, ch->sess, srp_cmd->cdb, |
e1dd413c BVA |
1469 | &send_ioctx->sense_data[0], |
1470 | scsilun_to_int(&srp_cmd->lun), data_len, | |
b99f8e4d CH |
1471 | TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF, |
1472 | sg, sg_cnt, NULL, 0, NULL, 0); | |
9474b043 | 1473 | if (rc != 0) { |
2c7f37ff BVA |
1474 | pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc, |
1475 | srp_cmd->tag); | |
1476 | goto release_ioctx; | |
187e70a5 | 1477 | } |
2c7f37ff | 1478 | return; |
a42d985b | 1479 | |
2c7f37ff BVA |
1480 | release_ioctx: |
1481 | send_ioctx->state = SRPT_STATE_DONE; | |
1482 | srpt_release_cmd(cmd); | |
a42d985b BVA |
1483 | } |
1484 | ||
a42d985b BVA |
1485 | static int srp_tmr_to_tcm(int fn) |
1486 | { | |
1487 | switch (fn) { | |
1488 | case SRP_TSK_ABORT_TASK: | |
1489 | return TMR_ABORT_TASK; | |
1490 | case SRP_TSK_ABORT_TASK_SET: | |
1491 | return TMR_ABORT_TASK_SET; | |
1492 | case SRP_TSK_CLEAR_TASK_SET: | |
1493 | return TMR_CLEAR_TASK_SET; | |
1494 | case SRP_TSK_LUN_RESET: | |
1495 | return TMR_LUN_RESET; | |
1496 | case SRP_TSK_CLEAR_ACA: | |
1497 | return TMR_CLEAR_ACA; | |
1498 | default: | |
1499 | return -1; | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | /** | |
10eac19b BVA |
1504 | * srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit |
1505 | * @ch: SRPT RDMA channel. | |
1506 | * @recv_ioctx: Receive I/O context. | |
1507 | * @send_ioctx: Send I/O context. | |
a42d985b BVA |
1508 | * |
1509 | * Returns 0 if and only if the request will be processed by the target core. | |
1510 | * | |
1511 | * For more information about SRP_TSK_MGMT information units, see also section | |
1512 | * 6.7 in the SRP r16a document. | |
1513 | */ | |
1514 | static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch, | |
1515 | struct srpt_recv_ioctx *recv_ioctx, | |
1516 | struct srpt_send_ioctx *send_ioctx) | |
1517 | { | |
1518 | struct srp_tsk_mgmt *srp_tsk; | |
1519 | struct se_cmd *cmd; | |
3e4f5748 | 1520 | struct se_session *sess = ch->sess; |
a42d985b | 1521 | int tcm_tmr; |
3e4f5748 | 1522 | int rc; |
a42d985b BVA |
1523 | |
1524 | BUG_ON(!send_ioctx); | |
1525 | ||
1526 | srp_tsk = recv_ioctx->ioctx.buf; | |
1527 | cmd = &send_ioctx->cmd; | |
1528 | ||
090fa24b BVA |
1529 | pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n", |
1530 | srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, ch, | |
1531 | ch->sess); | |
a42d985b BVA |
1532 | |
1533 | srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT); | |
649ee054 | 1534 | send_ioctx->cmd.tag = srp_tsk->tag; |
a42d985b | 1535 | tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func); |
e1dd413c BVA |
1536 | rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL, |
1537 | scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr, | |
1538 | GFP_KERNEL, srp_tsk->task_tag, | |
1539 | TARGET_SCF_ACK_KREF); | |
3e4f5748 NB |
1540 | if (rc != 0) { |
1541 | send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED; | |
de103c93 | 1542 | goto fail; |
a42d985b | 1543 | } |
de103c93 CH |
1544 | return; |
1545 | fail: | |
de103c93 | 1546 | transport_send_check_condition_and_sense(cmd, 0, 0); // XXX: |
a42d985b BVA |
1547 | } |
1548 | ||
1549 | /** | |
10eac19b | 1550 | * srpt_handle_new_iu - process a newly received information unit |
a42d985b | 1551 | * @ch: RDMA channel through which the information unit has been received. |
10eac19b | 1552 | * @recv_ioctx: Receive I/O context associated with the information unit. |
a42d985b | 1553 | */ |
fcf58936 BVA |
1554 | static bool |
1555 | srpt_handle_new_iu(struct srpt_rdma_ch *ch, struct srpt_recv_ioctx *recv_ioctx) | |
a42d985b | 1556 | { |
fcf58936 | 1557 | struct srpt_send_ioctx *send_ioctx = NULL; |
a42d985b | 1558 | struct srp_cmd *srp_cmd; |
fcf58936 BVA |
1559 | bool res = false; |
1560 | u8 opcode; | |
a42d985b BVA |
1561 | |
1562 | BUG_ON(!ch); | |
1563 | BUG_ON(!recv_ioctx); | |
1564 | ||
fcf58936 BVA |
1565 | if (unlikely(ch->state == CH_CONNECTING)) |
1566 | goto push; | |
1567 | ||
a42d985b BVA |
1568 | ib_dma_sync_single_for_cpu(ch->sport->sdev->device, |
1569 | recv_ioctx->ioctx.dma, srp_max_req_size, | |
1570 | DMA_FROM_DEVICE); | |
1571 | ||
a42d985b | 1572 | srp_cmd = recv_ioctx->ioctx.buf; |
fcf58936 BVA |
1573 | opcode = srp_cmd->opcode; |
1574 | if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) { | |
1575 | send_ioctx = srpt_get_send_ioctx(ch); | |
b99f8e4d | 1576 | if (unlikely(!send_ioctx)) |
fcf58936 | 1577 | goto push; |
a42d985b BVA |
1578 | } |
1579 | ||
fcf58936 BVA |
1580 | if (!list_empty(&recv_ioctx->wait_list)) { |
1581 | WARN_ON_ONCE(!ch->processing_wait_list); | |
1582 | list_del_init(&recv_ioctx->wait_list); | |
1583 | } | |
1584 | ||
1585 | switch (opcode) { | |
a42d985b BVA |
1586 | case SRP_CMD: |
1587 | srpt_handle_cmd(ch, recv_ioctx, send_ioctx); | |
1588 | break; | |
1589 | case SRP_TSK_MGMT: | |
1590 | srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx); | |
1591 | break; | |
1592 | case SRP_I_LOGOUT: | |
9f5d32af | 1593 | pr_err("Not yet implemented: SRP_I_LOGOUT\n"); |
a42d985b BVA |
1594 | break; |
1595 | case SRP_CRED_RSP: | |
1596 | pr_debug("received SRP_CRED_RSP\n"); | |
1597 | break; | |
1598 | case SRP_AER_RSP: | |
1599 | pr_debug("received SRP_AER_RSP\n"); | |
1600 | break; | |
1601 | case SRP_RSP: | |
9f5d32af | 1602 | pr_err("Received SRP_RSP\n"); |
a42d985b BVA |
1603 | break; |
1604 | default: | |
fcf58936 | 1605 | pr_err("received IU with unknown opcode 0x%x\n", opcode); |
a42d985b BVA |
1606 | break; |
1607 | } | |
1608 | ||
dea26209 | 1609 | srpt_post_recv(ch->sport->sdev, ch, recv_ioctx); |
fcf58936 | 1610 | res = true; |
b99f8e4d | 1611 | |
fcf58936 BVA |
1612 | out: |
1613 | return res; | |
1614 | ||
1615 | push: | |
1616 | if (list_empty(&recv_ioctx->wait_list)) { | |
1617 | WARN_ON_ONCE(ch->processing_wait_list); | |
1618 | list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list); | |
1619 | } | |
1620 | goto out; | |
a42d985b BVA |
1621 | } |
1622 | ||
59fae4de | 1623 | static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1624 | { |
59fae4de CH |
1625 | struct srpt_rdma_ch *ch = cq->cq_context; |
1626 | struct srpt_recv_ioctx *ioctx = | |
1627 | container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe); | |
a42d985b | 1628 | |
a42d985b BVA |
1629 | if (wc->status == IB_WC_SUCCESS) { |
1630 | int req_lim; | |
1631 | ||
1632 | req_lim = atomic_dec_return(&ch->req_lim); | |
1633 | if (unlikely(req_lim < 0)) | |
9f5d32af | 1634 | pr_err("req_lim = %d < 0\n", req_lim); |
fcf58936 | 1635 | srpt_handle_new_iu(ch, ioctx); |
a42d985b | 1636 | } else { |
3fa7f0e9 BVA |
1637 | pr_info_ratelimited("receiving failed for ioctx %p with status %d\n", |
1638 | ioctx, wc->status); | |
a42d985b BVA |
1639 | } |
1640 | } | |
1641 | ||
539b3248 BVA |
1642 | /* |
1643 | * This function must be called from the context in which RDMA completions are | |
1644 | * processed because it accesses the wait list without protection against | |
1645 | * access from other threads. | |
1646 | */ | |
1647 | static void srpt_process_wait_list(struct srpt_rdma_ch *ch) | |
1648 | { | |
fcf58936 | 1649 | struct srpt_recv_ioctx *recv_ioctx, *tmp; |
539b3248 | 1650 | |
fcf58936 | 1651 | WARN_ON_ONCE(ch->state == CH_CONNECTING); |
539b3248 | 1652 | |
fcf58936 BVA |
1653 | if (list_empty(&ch->cmd_wait_list)) |
1654 | return; | |
1655 | ||
1656 | WARN_ON_ONCE(ch->processing_wait_list); | |
1657 | ch->processing_wait_list = true; | |
1658 | list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list, | |
1659 | wait_list) { | |
1660 | if (!srpt_handle_new_iu(ch, recv_ioctx)) | |
1661 | break; | |
539b3248 | 1662 | } |
fcf58936 | 1663 | ch->processing_wait_list = false; |
539b3248 BVA |
1664 | } |
1665 | ||
a42d985b | 1666 | /** |
10eac19b BVA |
1667 | * srpt_send_done - send completion callback |
1668 | * @cq: Completion queue. | |
1669 | * @wc: Work completion. | |
1670 | * | |
a42d985b BVA |
1671 | * Note: Although this has not yet been observed during tests, at least in |
1672 | * theory it is possible that the srpt_get_send_ioctx() call invoked by | |
1673 | * srpt_handle_new_iu() fails. This is possible because the req_lim_delta | |
1674 | * value in each response is set to one, and it is possible that this response | |
1675 | * makes the initiator send a new request before the send completion for that | |
1676 | * response has been processed. This could e.g. happen if the call to | |
1677 | * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or | |
1678 | * if IB retransmission causes generation of the send completion to be | |
1679 | * delayed. Incoming information units for which srpt_get_send_ioctx() fails | |
1680 | * are queued on cmd_wait_list. The code below processes these delayed | |
1681 | * requests one at a time. | |
1682 | */ | |
59fae4de | 1683 | static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc) |
a42d985b | 1684 | { |
59fae4de CH |
1685 | struct srpt_rdma_ch *ch = cq->cq_context; |
1686 | struct srpt_send_ioctx *ioctx = | |
1687 | container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe); | |
1688 | enum srpt_command_state state; | |
a42d985b | 1689 | |
59fae4de CH |
1690 | state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); |
1691 | ||
1692 | WARN_ON(state != SRPT_STATE_CMD_RSP_SENT && | |
1693 | state != SRPT_STATE_MGMT_RSP_SENT); | |
1694 | ||
b99f8e4d | 1695 | atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail); |
59fae4de | 1696 | |
49f40163 | 1697 | if (wc->status != IB_WC_SUCCESS) |
59fae4de CH |
1698 | pr_info("sending response for ioctx 0x%p failed" |
1699 | " with status %d\n", ioctx, wc->status); | |
1700 | ||
59fae4de | 1701 | if (state != SRPT_STATE_DONE) { |
59fae4de | 1702 | transport_generic_free_cmd(&ioctx->cmd, 0); |
a42d985b | 1703 | } else { |
59fae4de CH |
1704 | pr_err("IB completion has been received too late for" |
1705 | " wr_id = %u.\n", ioctx->ioctx.index); | |
a42d985b BVA |
1706 | } |
1707 | ||
539b3248 | 1708 | srpt_process_wait_list(ch); |
a42d985b BVA |
1709 | } |
1710 | ||
a42d985b | 1711 | /** |
10eac19b BVA |
1712 | * srpt_create_ch_ib - create receive and send completion queues |
1713 | * @ch: SRPT RDMA channel. | |
a42d985b BVA |
1714 | */ |
1715 | static int srpt_create_ch_ib(struct srpt_rdma_ch *ch) | |
1716 | { | |
1717 | struct ib_qp_init_attr *qp_init; | |
1718 | struct srpt_port *sport = ch->sport; | |
1719 | struct srpt_device *sdev = sport->sdev; | |
30c6d877 | 1720 | const struct ib_device_attr *attrs = &sdev->device->attrs; |
ed262287 | 1721 | int sq_size = sport->port_attrib.srp_sq_size; |
dea26209 | 1722 | int i, ret; |
a42d985b BVA |
1723 | |
1724 | WARN_ON(ch->rq_size < 1); | |
1725 | ||
1726 | ret = -ENOMEM; | |
9d2aa2b4 | 1727 | qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL); |
a42d985b BVA |
1728 | if (!qp_init) |
1729 | goto out; | |
1730 | ||
ab477c1f | 1731 | retry: |
ed262287 | 1732 | ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + sq_size, |
59fae4de | 1733 | 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE); |
a42d985b BVA |
1734 | if (IS_ERR(ch->cq)) { |
1735 | ret = PTR_ERR(ch->cq); | |
9f5d32af | 1736 | pr_err("failed to create CQ cqe= %d ret= %d\n", |
ed262287 | 1737 | ch->rq_size + sq_size, ret); |
a42d985b BVA |
1738 | goto out; |
1739 | } | |
1740 | ||
1741 | qp_init->qp_context = (void *)ch; | |
1742 | qp_init->event_handler | |
1743 | = (void(*)(struct ib_event *, void*))srpt_qp_event; | |
1744 | qp_init->send_cq = ch->cq; | |
1745 | qp_init->recv_cq = ch->cq; | |
a42d985b BVA |
1746 | qp_init->sq_sig_type = IB_SIGNAL_REQ_WR; |
1747 | qp_init->qp_type = IB_QPT_RC; | |
b99f8e4d CH |
1748 | /* |
1749 | * We divide up our send queue size into half SEND WRs to send the | |
1750 | * completions, and half R/W contexts to actually do the RDMA | |
1751 | * READ/WRITE transfers. Note that we need to allocate CQ slots for | |
1752 | * both both, as RDMA contexts will also post completions for the | |
1753 | * RDMA READ case. | |
1754 | */ | |
ed262287 BVA |
1755 | qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr); |
1756 | qp_init->cap.max_rdma_ctxs = sq_size / 2; | |
30c6d877 | 1757 | qp_init->cap.max_send_sge = min(attrs->max_sge, SRPT_MAX_SG_PER_WQE); |
b99f8e4d | 1758 | qp_init->port_num = ch->sport->port; |
dea26209 BVA |
1759 | if (sdev->use_srq) { |
1760 | qp_init->srq = sdev->srq; | |
1761 | } else { | |
1762 | qp_init->cap.max_recv_wr = ch->rq_size; | |
1763 | qp_init->cap.max_recv_sge = qp_init->cap.max_send_sge; | |
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 BVA |
1835 | if (!srpt_set_ch_state(ch, CH_DRAINING)) { |
1836 | pr_debug("%s-%d: already closed\n", ch->sess_name, | |
1837 | ch->qp->qp_num); | |
1838 | return false; | |
a42d985b | 1839 | } |
a42d985b | 1840 | |
aaf45bd8 | 1841 | kref_get(&ch->kref); |
a42d985b | 1842 | |
aaf45bd8 BVA |
1843 | ret = srpt_ch_qp_err(ch); |
1844 | if (ret < 0) | |
1845 | pr_err("%s-%d: changing queue pair into error state failed: %d\n", | |
1846 | ch->sess_name, ch->qp->qp_num, ret); | |
a42d985b | 1847 | |
aaf45bd8 BVA |
1848 | ret = srpt_zerolength_write(ch); |
1849 | if (ret < 0) { | |
1850 | pr_err("%s-%d: queuing zero-length write failed: %d\n", | |
1851 | ch->sess_name, ch->qp->qp_num, ret); | |
1852 | if (srpt_set_ch_state(ch, CH_DISCONNECTED)) | |
1853 | schedule_work(&ch->release_work); | |
1854 | else | |
1855 | WARN_ON_ONCE(true); | |
1856 | } | |
a42d985b | 1857 | |
aaf45bd8 BVA |
1858 | kref_put(&ch->kref, srpt_free_ch); |
1859 | ||
1860 | return true; | |
1d19f780 NB |
1861 | } |
1862 | ||
aaf45bd8 BVA |
1863 | /* |
1864 | * Change the channel state into CH_DISCONNECTING. If a channel has not yet | |
1865 | * reached the connected state, close it. If a channel is in the connected | |
1866 | * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is | |
1867 | * the responsibility of the caller to ensure that this function is not | |
1868 | * invoked concurrently with the code that accepts a connection. This means | |
1869 | * that this function must either be invoked from inside a CM callback | |
1870 | * function or that it must be invoked with the srpt_port.mutex held. | |
a42d985b | 1871 | */ |
aaf45bd8 | 1872 | static int srpt_disconnect_ch(struct srpt_rdma_ch *ch) |
a42d985b | 1873 | { |
a42d985b | 1874 | int ret; |
a42d985b | 1875 | |
aaf45bd8 BVA |
1876 | if (!srpt_set_ch_state(ch, CH_DISCONNECTING)) |
1877 | return -ENOTCONN; | |
a42d985b | 1878 | |
63cf1a90 BVA |
1879 | if (ch->using_rdma_cm) { |
1880 | ret = rdma_disconnect(ch->rdma_cm.cm_id); | |
1881 | } else { | |
1882 | ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0); | |
1883 | if (ret < 0) | |
1884 | ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0); | |
1885 | } | |
a42d985b | 1886 | |
aaf45bd8 BVA |
1887 | if (ret < 0 && srpt_close_ch(ch)) |
1888 | ret = 0; | |
1d19f780 | 1889 | |
aaf45bd8 BVA |
1890 | return ret; |
1891 | } | |
1892 | ||
ba60c84f | 1893 | static bool srpt_ch_closed(struct srpt_port *sport, struct srpt_rdma_ch *ch) |
44138344 | 1894 | { |
a1125314 | 1895 | struct srpt_nexus *nexus; |
44138344 BVA |
1896 | struct srpt_rdma_ch *ch2; |
1897 | bool res = true; | |
1898 | ||
1899 | rcu_read_lock(); | |
a1125314 BVA |
1900 | list_for_each_entry(nexus, &sport->nexus_list, entry) { |
1901 | list_for_each_entry(ch2, &nexus->ch_list, list) { | |
1902 | if (ch2 == ch) { | |
1903 | res = false; | |
1904 | goto done; | |
1905 | } | |
44138344 BVA |
1906 | } |
1907 | } | |
a1125314 | 1908 | done: |
44138344 BVA |
1909 | rcu_read_unlock(); |
1910 | ||
1911 | return res; | |
1912 | } | |
1913 | ||
940874f8 BVA |
1914 | /* Send DREQ and wait for DREP. */ |
1915 | static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch) | |
aaf45bd8 | 1916 | { |
ba60c84f | 1917 | struct srpt_port *sport = ch->sport; |
01b3ee13 BVA |
1918 | |
1919 | pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num, | |
1920 | ch->state); | |
1921 | ||
940874f8 BVA |
1922 | mutex_lock(&sport->mutex); |
1923 | srpt_disconnect_ch(ch); | |
ba60c84f | 1924 | mutex_unlock(&sport->mutex); |
01b3ee13 | 1925 | |
ba60c84f | 1926 | while (wait_event_timeout(sport->ch_releaseQ, srpt_ch_closed(sport, ch), |
44138344 | 1927 | 5 * HZ) == 0) |
01b3ee13 BVA |
1928 | pr_info("%s(%s-%d state %d): still waiting ...\n", __func__, |
1929 | ch->sess_name, ch->qp->qp_num, ch->state); | |
1930 | ||
01b3ee13 BVA |
1931 | } |
1932 | ||
a1125314 | 1933 | static void __srpt_close_all_ch(struct srpt_port *sport) |
aaf45bd8 | 1934 | { |
a1125314 | 1935 | struct srpt_nexus *nexus; |
aaf45bd8 BVA |
1936 | struct srpt_rdma_ch *ch; |
1937 | ||
ba60c84f | 1938 | lockdep_assert_held(&sport->mutex); |
aaf45bd8 | 1939 | |
a1125314 BVA |
1940 | list_for_each_entry(nexus, &sport->nexus_list, entry) { |
1941 | list_for_each_entry(ch, &nexus->ch_list, list) { | |
1942 | if (srpt_disconnect_ch(ch) >= 0) | |
1943 | pr_info("Closing channel %s-%d because target %s_%d has been disabled\n", | |
1944 | ch->sess_name, ch->qp->qp_num, | |
1945 | sport->sdev->device->name, sport->port); | |
1946 | srpt_close_ch(ch); | |
1947 | } | |
1948 | } | |
1949 | } | |
1950 | ||
1951 | /* | |
1952 | * Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if | |
1953 | * it does not yet exist. | |
1954 | */ | |
1955 | static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport, | |
1956 | const u8 i_port_id[16], | |
1957 | const u8 t_port_id[16]) | |
1958 | { | |
1959 | struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n; | |
8b6dc529 | 1960 | |
a1125314 BVA |
1961 | for (;;) { |
1962 | mutex_lock(&sport->mutex); | |
1963 | list_for_each_entry(n, &sport->nexus_list, entry) { | |
1964 | if (memcmp(n->i_port_id, i_port_id, 16) == 0 && | |
1965 | memcmp(n->t_port_id, t_port_id, 16) == 0) { | |
1966 | nexus = n; | |
1967 | break; | |
1968 | } | |
1969 | } | |
1970 | if (!nexus && tmp_nexus) { | |
1971 | list_add_tail_rcu(&tmp_nexus->entry, | |
1972 | &sport->nexus_list); | |
1973 | swap(nexus, tmp_nexus); | |
1974 | } | |
1975 | mutex_unlock(&sport->mutex); | |
1976 | ||
1977 | if (nexus) | |
1978 | break; | |
1979 | tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); | |
1980 | if (!tmp_nexus) { | |
1981 | nexus = ERR_PTR(-ENOMEM); | |
1982 | break; | |
8b6dc529 | 1983 | } |
a1125314 BVA |
1984 | INIT_LIST_HEAD(&tmp_nexus->ch_list); |
1985 | memcpy(tmp_nexus->i_port_id, i_port_id, 16); | |
1986 | memcpy(tmp_nexus->t_port_id, t_port_id, 16); | |
a42d985b | 1987 | } |
8b6dc529 | 1988 | |
a1125314 BVA |
1989 | kfree(tmp_nexus); |
1990 | ||
1991 | return nexus; | |
1992 | } | |
1993 | ||
1994 | static void srpt_set_enabled(struct srpt_port *sport, bool enabled) | |
1995 | __must_hold(&sport->mutex) | |
1996 | { | |
1997 | lockdep_assert_held(&sport->mutex); | |
1998 | ||
1999 | if (sport->enabled == enabled) | |
2000 | return; | |
2001 | sport->enabled = enabled; | |
2002 | if (!enabled) | |
2003 | __srpt_close_all_ch(sport); | |
a42d985b BVA |
2004 | } |
2005 | ||
aaf45bd8 BVA |
2006 | static void srpt_free_ch(struct kref *kref) |
2007 | { | |
2008 | struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref); | |
2009 | ||
795bc112 | 2010 | kfree_rcu(ch, rcu); |
a42d985b BVA |
2011 | } |
2012 | ||
2013 | static void srpt_release_channel_work(struct work_struct *w) | |
2014 | { | |
2015 | struct srpt_rdma_ch *ch; | |
2016 | struct srpt_device *sdev; | |
ba60c84f | 2017 | struct srpt_port *sport; |
9474b043 | 2018 | struct se_session *se_sess; |
a42d985b BVA |
2019 | |
2020 | ch = container_of(w, struct srpt_rdma_ch, release_work); | |
44138344 | 2021 | pr_debug("%s-%d\n", ch->sess_name, ch->qp->qp_num); |
a42d985b BVA |
2022 | |
2023 | sdev = ch->sport->sdev; | |
2024 | BUG_ON(!sdev); | |
2025 | ||
9474b043 NB |
2026 | se_sess = ch->sess; |
2027 | BUG_ON(!se_sess); | |
2028 | ||
88936259 | 2029 | target_sess_cmd_list_set_waiting(se_sess); |
be646c2d | 2030 | target_wait_for_sess_cmds(se_sess); |
9474b043 NB |
2031 | |
2032 | transport_deregister_session_configfs(se_sess); | |
2033 | transport_deregister_session(se_sess); | |
a42d985b BVA |
2034 | ch->sess = NULL; |
2035 | ||
63cf1a90 BVA |
2036 | if (ch->using_rdma_cm) |
2037 | rdma_destroy_id(ch->rdma_cm.cm_id); | |
2038 | else | |
2039 | ib_destroy_cm_id(ch->ib_cm.cm_id); | |
0b41d6ca | 2040 | |
a42d985b BVA |
2041 | srpt_destroy_ch_ib(ch); |
2042 | ||
2043 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring, | |
2044 | ch->sport->sdev, ch->rq_size, | |
ed262287 | 2045 | ch->max_rsp_size, DMA_TO_DEVICE); |
a42d985b | 2046 | |
dea26209 BVA |
2047 | srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring, |
2048 | sdev, ch->rq_size, | |
2049 | srp_max_req_size, DMA_FROM_DEVICE); | |
2050 | ||
ba60c84f BVA |
2051 | sport = ch->sport; |
2052 | mutex_lock(&sport->mutex); | |
795bc112 | 2053 | list_del_rcu(&ch->list); |
ba60c84f | 2054 | mutex_unlock(&sport->mutex); |
795bc112 | 2055 | |
ba60c84f | 2056 | wake_up(&sport->ch_releaseQ); |
a42d985b | 2057 | |
aaf45bd8 | 2058 | kref_put(&ch->kref, srpt_free_ch); |
a42d985b BVA |
2059 | } |
2060 | ||
a42d985b | 2061 | /** |
10eac19b | 2062 | * srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED |
63cf1a90 BVA |
2063 | * @sdev: HCA through which the login request was received. |
2064 | * @ib_cm_id: IB/CM connection identifier in case of IB/CM. | |
2065 | * @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM. | |
2066 | * @port_num: Port through which the REQ message was received. | |
2ffcf042 BVA |
2067 | * @pkey: P_Key of the incoming connection. |
2068 | * @req: SRP login request. | |
63cf1a90 BVA |
2069 | * @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted |
2070 | * the login request. | |
a42d985b BVA |
2071 | * |
2072 | * Ownership of the cm_id is transferred to the target session if this | |
63cf1a90 | 2073 | * function returns zero. Otherwise the caller remains the owner of cm_id. |
a42d985b | 2074 | */ |
63cf1a90 BVA |
2075 | static int srpt_cm_req_recv(struct srpt_device *const sdev, |
2076 | struct ib_cm_id *ib_cm_id, | |
2077 | struct rdma_cm_id *rdma_cm_id, | |
2ffcf042 BVA |
2078 | u8 port_num, __be16 pkey, |
2079 | const struct srp_login_req *req, | |
2080 | const char *src_addr) | |
a42d985b | 2081 | { |
2ffcf042 | 2082 | struct srpt_port *sport = &sdev->port[port_num - 1]; |
a1125314 | 2083 | struct srpt_nexus *nexus; |
a1125314 BVA |
2084 | struct srp_login_rsp *rsp = NULL; |
2085 | struct srp_login_rej *rej = NULL; | |
63cf1a90 BVA |
2086 | union { |
2087 | struct rdma_conn_param rdma_cm; | |
2088 | struct ib_cm_rep_param ib_cm; | |
2089 | } *rep_param = NULL; | |
a1125314 | 2090 | struct srpt_rdma_ch *ch; |
2dc98f09 | 2091 | char i_port_id[36]; |
a42d985b | 2092 | u32 it_iu_len; |
db7683d7 | 2093 | int i, ret; |
a42d985b BVA |
2094 | |
2095 | WARN_ON_ONCE(irqs_disabled()); | |
2096 | ||
2ffcf042 | 2097 | if (WARN_ON(!sdev || !req)) |
a42d985b BVA |
2098 | return -EINVAL; |
2099 | ||
a42d985b BVA |
2100 | it_iu_len = be32_to_cpu(req->req_it_iu_len); |
2101 | ||
c5efb621 | 2102 | 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 | 2103 | req->initiator_port_id, req->target_port_id, it_iu_len, |
2ffcf042 | 2104 | port_num, &sport->gid, be16_to_cpu(pkey)); |
a42d985b | 2105 | |
a1125314 BVA |
2106 | nexus = srpt_get_nexus(sport, req->initiator_port_id, |
2107 | req->target_port_id); | |
2108 | if (IS_ERR(nexus)) { | |
2109 | ret = PTR_ERR(nexus); | |
2110 | goto out; | |
2111 | } | |
2112 | ||
db7683d7 | 2113 | ret = -ENOMEM; |
9d2aa2b4 BVA |
2114 | rsp = kzalloc(sizeof(*rsp), GFP_KERNEL); |
2115 | rej = kzalloc(sizeof(*rej), GFP_KERNEL); | |
2116 | rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL); | |
db7683d7 | 2117 | if (!rsp || !rej || !rep_param) |
a42d985b | 2118 | goto out; |
a42d985b | 2119 | |
db7683d7 | 2120 | ret = -EINVAL; |
a42d985b | 2121 | if (it_iu_len > srp_max_req_size || it_iu_len < 64) { |
b356c1c1 | 2122 | rej->reason = cpu_to_be32( |
db7683d7 BVA |
2123 | SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE); |
2124 | pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n", | |
a42d985b BVA |
2125 | it_iu_len, 64, srp_max_req_size); |
2126 | goto reject; | |
2127 | } | |
2128 | ||
2129 | if (!sport->enabled) { | |
db7683d7 BVA |
2130 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
2131 | pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n", | |
2ffcf042 | 2132 | sport->sdev->device->name, port_num); |
a42d985b BVA |
2133 | goto reject; |
2134 | } | |
2135 | ||
a42d985b BVA |
2136 | if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid) |
2137 | || *(__be64 *)(req->target_port_id + 8) != | |
2138 | cpu_to_be64(srpt_service_guid)) { | |
b356c1c1 | 2139 | rej->reason = cpu_to_be32( |
db7683d7 BVA |
2140 | SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL); |
2141 | pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n"); | |
a42d985b BVA |
2142 | goto reject; |
2143 | } | |
2144 | ||
db7683d7 | 2145 | ret = -ENOMEM; |
9d2aa2b4 | 2146 | ch = kzalloc(sizeof(*ch), GFP_KERNEL); |
a42d985b | 2147 | if (!ch) { |
db7683d7 BVA |
2148 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
2149 | pr_err("rejected SRP_LOGIN_REQ because out of memory.\n"); | |
a42d985b BVA |
2150 | goto reject; |
2151 | } | |
2152 | ||
aaf45bd8 | 2153 | kref_init(&ch->kref); |
2ffcf042 | 2154 | ch->pkey = be16_to_cpu(pkey); |
a1125314 | 2155 | ch->nexus = nexus; |
aaf45bd8 | 2156 | ch->zw_cqe.done = srpt_zerolength_write_done; |
a42d985b | 2157 | INIT_WORK(&ch->release_work, srpt_release_channel_work); |
2ffcf042 | 2158 | ch->sport = sport; |
63cf1a90 BVA |
2159 | if (ib_cm_id) { |
2160 | ch->ib_cm.cm_id = ib_cm_id; | |
2161 | ib_cm_id->context = ch; | |
2162 | } else { | |
2163 | ch->using_rdma_cm = true; | |
2164 | ch->rdma_cm.cm_id = rdma_cm_id; | |
2165 | rdma_cm_id->context = ch; | |
2166 | } | |
a42d985b | 2167 | /* |
7a01d05c BVA |
2168 | * ch->rq_size should be at least as large as the initiator queue |
2169 | * depth to avoid that the initiator driver has to report QUEUE_FULL | |
2170 | * to the SCSI mid-layer. | |
a42d985b | 2171 | */ |
ed262287 | 2172 | ch->rq_size = min(MAX_SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr); |
a42d985b BVA |
2173 | spin_lock_init(&ch->spinlock); |
2174 | ch->state = CH_CONNECTING; | |
2175 | INIT_LIST_HEAD(&ch->cmd_wait_list); | |
ed262287 | 2176 | ch->max_rsp_size = ch->sport->port_attrib.srp_max_rsp_size; |
a42d985b BVA |
2177 | |
2178 | ch->ioctx_ring = (struct srpt_send_ioctx **) | |
2179 | srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, | |
2180 | sizeof(*ch->ioctx_ring[0]), | |
ed262287 | 2181 | ch->max_rsp_size, DMA_TO_DEVICE); |
db7683d7 BVA |
2182 | if (!ch->ioctx_ring) { |
2183 | pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n"); | |
2184 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
a42d985b | 2185 | goto free_ch; |
db7683d7 | 2186 | } |
a42d985b | 2187 | |
3c968887 BVA |
2188 | INIT_LIST_HEAD(&ch->free_list); |
2189 | for (i = 0; i < ch->rq_size; i++) { | |
2190 | ch->ioctx_ring[i]->ch = ch; | |
2191 | list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list); | |
2192 | } | |
dea26209 BVA |
2193 | if (!sdev->use_srq) { |
2194 | ch->ioctx_recv_ring = (struct srpt_recv_ioctx **) | |
2195 | srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size, | |
2196 | sizeof(*ch->ioctx_recv_ring[0]), | |
2197 | srp_max_req_size, | |
2198 | DMA_FROM_DEVICE); | |
2199 | if (!ch->ioctx_recv_ring) { | |
2200 | pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n"); | |
2201 | rej->reason = | |
2202 | cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); | |
2203 | goto free_ring; | |
2204 | } | |
fcf58936 BVA |
2205 | for (i = 0; i < ch->rq_size; i++) |
2206 | INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list); | |
dea26209 | 2207 | } |
3c968887 | 2208 | |
a42d985b | 2209 | ret = srpt_create_ch_ib(ch); |
a42d985b | 2210 | if (ret) { |
b356c1c1 | 2211 | rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); |
db7683d7 BVA |
2212 | pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n"); |
2213 | goto free_recv_ring; | |
a42d985b | 2214 | } |
f246c941 | 2215 | |
2ffcf042 | 2216 | strlcpy(ch->sess_name, src_addr, sizeof(ch->sess_name)); |
2dc98f09 | 2217 | snprintf(i_port_id, sizeof(i_port_id), "0x%016llx%016llx", |
a1125314 BVA |
2218 | be64_to_cpu(*(__be64 *)nexus->i_port_id), |
2219 | be64_to_cpu(*(__be64 *)(nexus->i_port_id + 8))); | |
a42d985b BVA |
2220 | |
2221 | pr_debug("registering session %s\n", ch->sess_name); | |
2222 | ||
2bce1a6d BVA |
2223 | if (sport->port_guid_tpg.se_tpg_wwn) |
2224 | ch->sess = target_alloc_session(&sport->port_guid_tpg, 0, 0, | |
2225 | TARGET_PROT_NORMAL, | |
2dc98f09 | 2226 | ch->sess_name, ch, NULL); |
2bce1a6d BVA |
2227 | if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess)) |
2228 | ch->sess = target_alloc_session(&sport->port_gid_tpg, 0, 0, | |
2dc98f09 | 2229 | TARGET_PROT_NORMAL, i_port_id, ch, |
0d38c240 BVA |
2230 | NULL); |
2231 | /* Retry without leading "0x" */ | |
2bce1a6d BVA |
2232 | if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess)) |
2233 | ch->sess = target_alloc_session(&sport->port_gid_tpg, 0, 0, | |
0d38c240 | 2234 | TARGET_PROT_NORMAL, |
2dc98f09 | 2235 | i_port_id + 2, ch, NULL); |
2bce1a6d | 2236 | if (IS_ERR_OR_NULL(ch->sess)) { |
db7683d7 BVA |
2237 | ret = PTR_ERR(ch->sess); |
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); |
db7683d7 BVA |
2243 | goto reject; |
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); | |
f246c941 | 2282 | goto destroy_ib; |
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); |
a42d985b | 2361 | free_ch: |
63cf1a90 BVA |
2362 | if (ib_cm_id) |
2363 | ib_cm_id->context = NULL; | |
a42d985b | 2364 | kfree(ch); |
db7683d7 BVA |
2365 | ch = NULL; |
2366 | ||
2367 | WARN_ON_ONCE(ret == 0); | |
a42d985b BVA |
2368 | |
2369 | reject: | |
db7683d7 | 2370 | pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason)); |
a42d985b BVA |
2371 | rej->opcode = SRP_LOGIN_REJ; |
2372 | rej->tag = req->tag; | |
db7683d7 BVA |
2373 | rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | |
2374 | SRP_BUF_FORMAT_INDIRECT); | |
a42d985b | 2375 | |
63cf1a90 BVA |
2376 | if (rdma_cm_id) |
2377 | rdma_reject(rdma_cm_id, rej, sizeof(*rej)); | |
2378 | else | |
2379 | ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, | |
2380 | rej, sizeof(*rej)); | |
a42d985b BVA |
2381 | |
2382 | out: | |
2383 | kfree(rep_param); | |
2384 | kfree(rsp); | |
2385 | kfree(rej); | |
2386 | ||
2387 | return ret; | |
2388 | } | |
2389 | ||
2ffcf042 BVA |
2390 | static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id, |
2391 | struct ib_cm_req_event_param *param, | |
2392 | void *private_data) | |
2393 | { | |
2394 | char sguid[40]; | |
2395 | ||
2396 | srpt_format_guid(sguid, sizeof(sguid), | |
2397 | ¶m->primary_path->dgid.global.interface_id); | |
2398 | ||
63cf1a90 BVA |
2399 | return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port, |
2400 | param->primary_path->pkey, | |
2ffcf042 BVA |
2401 | private_data, sguid); |
2402 | } | |
2403 | ||
63cf1a90 BVA |
2404 | static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id, |
2405 | struct rdma_cm_event *event) | |
2406 | { | |
2407 | struct srpt_device *sdev; | |
2408 | struct srp_login_req req; | |
2409 | const struct srp_login_req_rdma *req_rdma; | |
2410 | char src_addr[40]; | |
2411 | ||
2412 | sdev = ib_get_client_data(cm_id->device, &srpt_client); | |
2413 | if (!sdev) | |
2414 | return -ECONNREFUSED; | |
2415 | ||
2416 | if (event->param.conn.private_data_len < sizeof(*req_rdma)) | |
2417 | return -EINVAL; | |
2418 | ||
2419 | /* Transform srp_login_req_rdma into srp_login_req. */ | |
2420 | req_rdma = event->param.conn.private_data; | |
2421 | memset(&req, 0, sizeof(req)); | |
2422 | req.opcode = req_rdma->opcode; | |
2423 | req.tag = req_rdma->tag; | |
2424 | req.req_it_iu_len = req_rdma->req_it_iu_len; | |
2425 | req.req_buf_fmt = req_rdma->req_buf_fmt; | |
2426 | req.req_flags = req_rdma->req_flags; | |
2427 | memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16); | |
2428 | memcpy(req.target_port_id, req_rdma->target_port_id, 16); | |
2429 | ||
2430 | snprintf(src_addr, sizeof(src_addr), "%pIS", | |
2431 | &cm_id->route.addr.src_addr); | |
2432 | ||
2433 | return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num, | |
2434 | cm_id->route.path_rec->pkey, &req, src_addr); | |
2435 | } | |
2436 | ||
2739b592 BVA |
2437 | static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch, |
2438 | enum ib_cm_rej_reason reason, | |
2439 | const u8 *private_data, | |
2440 | u8 private_data_len) | |
a42d985b | 2441 | { |
c13c90ea BVA |
2442 | char *priv = NULL; |
2443 | int i; | |
2444 | ||
2445 | if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1, | |
2446 | GFP_KERNEL))) { | |
2447 | for (i = 0; i < private_data_len; i++) | |
2448 | sprintf(priv + 3 * i, " %02x", private_data[i]); | |
2449 | } | |
2450 | pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n", | |
2451 | ch->sess_name, ch->qp->qp_num, reason, private_data_len ? | |
2452 | "; private data" : "", priv ? priv : " (?)"); | |
2453 | kfree(priv); | |
a42d985b BVA |
2454 | } |
2455 | ||
2456 | /** | |
10eac19b BVA |
2457 | * srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event |
2458 | * @ch: SRPT RDMA channel. | |
a42d985b | 2459 | * |
63cf1a90 BVA |
2460 | * An RTU (ready to use) message indicates that the connection has been |
2461 | * established and that the recipient may begin transmitting. | |
a42d985b | 2462 | */ |
2739b592 | 2463 | static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch) |
a42d985b | 2464 | { |
a42d985b BVA |
2465 | int ret; |
2466 | ||
63cf1a90 | 2467 | ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp); |
db7683d7 BVA |
2468 | if (ret < 0) { |
2469 | pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name, | |
2470 | ch->qp->qp_num); | |
2471 | srpt_close_ch(ch); | |
2472 | return; | |
a42d985b | 2473 | } |
db7683d7 | 2474 | |
db7683d7 BVA |
2475 | /* |
2476 | * Note: calling srpt_close_ch() if the transition to the LIVE state | |
2477 | * fails is not necessary since that means that that function has | |
2478 | * already been invoked from another thread. | |
2479 | */ | |
e28a547d | 2480 | if (!srpt_set_ch_state(ch, CH_LIVE)) { |
db7683d7 BVA |
2481 | pr_err("%s-%d: channel transition to LIVE state failed\n", |
2482 | ch->sess_name, ch->qp->qp_num); | |
e28a547d BVA |
2483 | return; |
2484 | } | |
2485 | ||
2486 | /* Trigger wait list processing. */ | |
2487 | ret = srpt_zerolength_write(ch); | |
2488 | WARN_ONCE(ret < 0, "%d\n", ret); | |
a42d985b BVA |
2489 | } |
2490 | ||
a42d985b | 2491 | /** |
10eac19b BVA |
2492 | * srpt_cm_handler - IB connection manager callback function |
2493 | * @cm_id: IB/CM connection identifier. | |
2494 | * @event: IB/CM event. | |
a42d985b BVA |
2495 | * |
2496 | * A non-zero return value will cause the caller destroy the CM ID. | |
2497 | * | |
2498 | * Note: srpt_cm_handler() must only return a non-zero value when transferring | |
2499 | * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning | |
2500 | * a non-zero value in any other case will trigger a race with the | |
2501 | * ib_destroy_cm_id() call in srpt_release_channel(). | |
2502 | */ | |
2503 | static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
2504 | { | |
2739b592 | 2505 | struct srpt_rdma_ch *ch = cm_id->context; |
a42d985b BVA |
2506 | int ret; |
2507 | ||
2508 | ret = 0; | |
2509 | switch (event->event) { | |
2510 | case IB_CM_REQ_RECEIVED: | |
2ffcf042 BVA |
2511 | ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd, |
2512 | event->private_data); | |
a42d985b BVA |
2513 | break; |
2514 | case IB_CM_REJ_RECEIVED: | |
2739b592 BVA |
2515 | srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason, |
2516 | event->private_data, | |
2517 | IB_CM_REJ_PRIVATE_DATA_SIZE); | |
a42d985b BVA |
2518 | break; |
2519 | case IB_CM_RTU_RECEIVED: | |
2520 | case IB_CM_USER_ESTABLISHED: | |
2739b592 | 2521 | srpt_cm_rtu_recv(ch); |
a42d985b BVA |
2522 | break; |
2523 | case IB_CM_DREQ_RECEIVED: | |
aaf45bd8 | 2524 | srpt_disconnect_ch(ch); |
a42d985b BVA |
2525 | break; |
2526 | case IB_CM_DREP_RECEIVED: | |
2739b592 BVA |
2527 | pr_info("Received CM DREP message for ch %s-%d.\n", |
2528 | ch->sess_name, ch->qp->qp_num); | |
aaf45bd8 | 2529 | srpt_close_ch(ch); |
a42d985b BVA |
2530 | break; |
2531 | case IB_CM_TIMEWAIT_EXIT: | |
2739b592 BVA |
2532 | pr_info("Received CM TimeWait exit for ch %s-%d.\n", |
2533 | ch->sess_name, ch->qp->qp_num); | |
aaf45bd8 | 2534 | srpt_close_ch(ch); |
a42d985b BVA |
2535 | break; |
2536 | case IB_CM_REP_ERROR: | |
2739b592 BVA |
2537 | pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, |
2538 | ch->qp->qp_num); | |
a42d985b BVA |
2539 | break; |
2540 | case IB_CM_DREQ_ERROR: | |
1e20a2a5 | 2541 | pr_info("Received CM DREQ ERROR event.\n"); |
a42d985b BVA |
2542 | break; |
2543 | case IB_CM_MRA_RECEIVED: | |
1e20a2a5 | 2544 | pr_info("Received CM MRA event\n"); |
a42d985b BVA |
2545 | break; |
2546 | default: | |
1e20a2a5 | 2547 | pr_err("received unrecognized CM event %d\n", event->event); |
a42d985b BVA |
2548 | break; |
2549 | } | |
2550 | ||
2551 | return ret; | |
2552 | } | |
2553 | ||
63cf1a90 BVA |
2554 | static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id, |
2555 | struct rdma_cm_event *event) | |
2556 | { | |
2557 | struct srpt_rdma_ch *ch = cm_id->context; | |
2558 | int ret = 0; | |
2559 | ||
2560 | switch (event->event) { | |
2561 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
2562 | ret = srpt_rdma_cm_req_recv(cm_id, event); | |
2563 | break; | |
2564 | case RDMA_CM_EVENT_REJECTED: | |
2565 | srpt_cm_rej_recv(ch, event->status, | |
2566 | event->param.conn.private_data, | |
2567 | event->param.conn.private_data_len); | |
2568 | break; | |
2569 | case RDMA_CM_EVENT_ESTABLISHED: | |
2570 | srpt_cm_rtu_recv(ch); | |
2571 | break; | |
2572 | case RDMA_CM_EVENT_DISCONNECTED: | |
2573 | if (ch->state < CH_DISCONNECTING) | |
2574 | srpt_disconnect_ch(ch); | |
2575 | else | |
2576 | srpt_close_ch(ch); | |
2577 | break; | |
2578 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: | |
2579 | srpt_close_ch(ch); | |
2580 | break; | |
2581 | case RDMA_CM_EVENT_UNREACHABLE: | |
2582 | pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name, | |
2583 | ch->qp->qp_num); | |
2584 | break; | |
2585 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
2586 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
2587 | break; | |
2588 | default: | |
2589 | pr_err("received unrecognized RDMA CM event %d\n", | |
2590 | event->event); | |
2591 | break; | |
2592 | } | |
2593 | ||
2594 | return ret; | |
2595 | } | |
2596 | ||
a42d985b BVA |
2597 | static int srpt_write_pending_status(struct se_cmd *se_cmd) |
2598 | { | |
2599 | struct srpt_send_ioctx *ioctx; | |
2600 | ||
2601 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
dd3bec86 | 2602 | return ioctx->state == SRPT_STATE_NEED_DATA; |
a42d985b BVA |
2603 | } |
2604 | ||
2605 | /* | |
10eac19b | 2606 | * srpt_write_pending - Start data transfer from initiator to target (write). |
a42d985b BVA |
2607 | */ |
2608 | static int srpt_write_pending(struct se_cmd *se_cmd) | |
2609 | { | |
fc3af58d BVA |
2610 | struct srpt_send_ioctx *ioctx = |
2611 | container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
2612 | struct srpt_rdma_ch *ch = ioctx->ch; | |
b99f8e4d CH |
2613 | struct ib_send_wr *first_wr = NULL, *bad_wr; |
2614 | struct ib_cqe *cqe = &ioctx->rdma_cqe; | |
a42d985b | 2615 | enum srpt_command_state new_state; |
b99f8e4d | 2616 | int ret, i; |
a42d985b BVA |
2617 | |
2618 | new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA); | |
2619 | WARN_ON(new_state == SRPT_STATE_DONE); | |
b99f8e4d CH |
2620 | |
2621 | if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) { | |
2622 | pr_warn("%s: IB send queue full (needed %d)\n", | |
2623 | __func__, ioctx->n_rdma); | |
2624 | ret = -ENOMEM; | |
2625 | goto out_undo; | |
2626 | } | |
2627 | ||
2628 | cqe->done = srpt_rdma_read_done; | |
2629 | for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) { | |
2630 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
2631 | ||
2632 | first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port, | |
2633 | cqe, first_wr); | |
2634 | cqe = NULL; | |
2635 | } | |
dcc9881e | 2636 | |
b99f8e4d CH |
2637 | ret = ib_post_send(ch->qp, first_wr, &bad_wr); |
2638 | if (ret) { | |
2639 | pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n", | |
2640 | __func__, ret, ioctx->n_rdma, | |
2641 | atomic_read(&ch->sq_wr_avail)); | |
2642 | goto out_undo; | |
2643 | } | |
2644 | ||
2645 | return 0; | |
2646 | out_undo: | |
2647 | atomic_add(ioctx->n_rdma, &ch->sq_wr_avail); | |
2648 | return ret; | |
a42d985b BVA |
2649 | } |
2650 | ||
2651 | static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status) | |
2652 | { | |
2653 | switch (tcm_mgmt_status) { | |
2654 | case TMR_FUNCTION_COMPLETE: | |
2655 | return SRP_TSK_MGMT_SUCCESS; | |
2656 | case TMR_FUNCTION_REJECTED: | |
2657 | return SRP_TSK_MGMT_FUNC_NOT_SUPP; | |
2658 | } | |
2659 | return SRP_TSK_MGMT_FAILED; | |
2660 | } | |
2661 | ||
2662 | /** | |
10eac19b BVA |
2663 | * srpt_queue_response - transmit the response to a SCSI command |
2664 | * @cmd: SCSI target command. | |
a42d985b BVA |
2665 | * |
2666 | * Callback function called by the TCM core. Must not block since it can be | |
2667 | * invoked on the context of the IB completion handler. | |
2668 | */ | |
b79fafac | 2669 | static void srpt_queue_response(struct se_cmd *cmd) |
a42d985b | 2670 | { |
b99f8e4d CH |
2671 | struct srpt_send_ioctx *ioctx = |
2672 | container_of(cmd, struct srpt_send_ioctx, cmd); | |
2673 | struct srpt_rdma_ch *ch = ioctx->ch; | |
2674 | struct srpt_device *sdev = ch->sport->sdev; | |
10fce586 | 2675 | struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr; |
b99f8e4d | 2676 | struct ib_sge sge; |
a42d985b | 2677 | enum srpt_command_state state; |
b99f8e4d | 2678 | int resp_len, ret, i; |
a42d985b BVA |
2679 | u8 srp_tm_status; |
2680 | ||
a42d985b BVA |
2681 | BUG_ON(!ch); |
2682 | ||
a42d985b BVA |
2683 | state = ioctx->state; |
2684 | switch (state) { | |
2685 | case SRPT_STATE_NEW: | |
2686 | case SRPT_STATE_DATA_IN: | |
2687 | ioctx->state = SRPT_STATE_CMD_RSP_SENT; | |
2688 | break; | |
2689 | case SRPT_STATE_MGMT: | |
2690 | ioctx->state = SRPT_STATE_MGMT_RSP_SENT; | |
2691 | break; | |
2692 | default: | |
2693 | WARN(true, "ch %p; cmd %d: unexpected command state %d\n", | |
2694 | ch, ioctx->ioctx.index, ioctx->state); | |
2695 | break; | |
2696 | } | |
a42d985b | 2697 | |
55d69427 | 2698 | if (unlikely(WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) |
b79fafac | 2699 | return; |
a42d985b | 2700 | |
a42d985b | 2701 | /* For read commands, transfer the data to the initiator. */ |
b99f8e4d CH |
2702 | if (ioctx->cmd.data_direction == DMA_FROM_DEVICE && |
2703 | ioctx->cmd.data_length && | |
a42d985b | 2704 | !ioctx->queue_status_only) { |
b99f8e4d CH |
2705 | for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) { |
2706 | struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i]; | |
2707 | ||
2708 | first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, | |
10fce586 | 2709 | ch->sport->port, NULL, first_wr); |
a42d985b BVA |
2710 | } |
2711 | } | |
2712 | ||
2713 | if (state != SRPT_STATE_MGMT) | |
649ee054 | 2714 | resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag, |
a42d985b BVA |
2715 | cmd->scsi_status); |
2716 | else { | |
2717 | srp_tm_status | |
2718 | = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response); | |
2719 | resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status, | |
649ee054 | 2720 | ioctx->cmd.tag); |
a42d985b | 2721 | } |
b99f8e4d CH |
2722 | |
2723 | atomic_inc(&ch->req_lim); | |
2724 | ||
2725 | if (unlikely(atomic_sub_return(1 + ioctx->n_rdma, | |
2726 | &ch->sq_wr_avail) < 0)) { | |
2727 | pr_warn("%s: IB send queue full (needed %d)\n", | |
2728 | __func__, ioctx->n_rdma); | |
2729 | ret = -ENOMEM; | |
2730 | goto out; | |
2731 | } | |
2732 | ||
2733 | ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len, | |
2734 | DMA_TO_DEVICE); | |
2735 | ||
2736 | sge.addr = ioctx->ioctx.dma; | |
2737 | sge.length = resp_len; | |
74333f12 | 2738 | sge.lkey = sdev->lkey; |
b99f8e4d CH |
2739 | |
2740 | ioctx->ioctx.cqe.done = srpt_send_done; | |
2741 | send_wr.next = NULL; | |
2742 | send_wr.wr_cqe = &ioctx->ioctx.cqe; | |
2743 | send_wr.sg_list = &sge; | |
2744 | send_wr.num_sge = 1; | |
2745 | send_wr.opcode = IB_WR_SEND; | |
2746 | send_wr.send_flags = IB_SEND_SIGNALED; | |
2747 | ||
2748 | ret = ib_post_send(ch->qp, first_wr, &bad_wr); | |
2749 | if (ret < 0) { | |
2750 | pr_err("%s: sending cmd response failed for tag %llu (%d)\n", | |
2751 | __func__, ioctx->cmd.tag, ret); | |
2752 | goto out; | |
a42d985b | 2753 | } |
b99f8e4d CH |
2754 | |
2755 | return; | |
2756 | ||
2757 | out: | |
2758 | atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail); | |
2759 | atomic_dec(&ch->req_lim); | |
2760 | srpt_set_cmd_state(ioctx, SRPT_STATE_DONE); | |
2761 | target_put_sess_cmd(&ioctx->cmd); | |
b79fafac | 2762 | } |
a42d985b | 2763 | |
b79fafac JE |
2764 | static int srpt_queue_data_in(struct se_cmd *cmd) |
2765 | { | |
2766 | srpt_queue_response(cmd); | |
2767 | return 0; | |
2768 | } | |
2769 | ||
2770 | static void srpt_queue_tm_rsp(struct se_cmd *cmd) | |
2771 | { | |
2772 | srpt_queue_response(cmd); | |
a42d985b BVA |
2773 | } |
2774 | ||
131e6abc NB |
2775 | static void srpt_aborted_task(struct se_cmd *cmd) |
2776 | { | |
131e6abc NB |
2777 | } |
2778 | ||
a42d985b BVA |
2779 | static int srpt_queue_status(struct se_cmd *cmd) |
2780 | { | |
2781 | struct srpt_send_ioctx *ioctx; | |
2782 | ||
2783 | ioctx = container_of(cmd, struct srpt_send_ioctx, cmd); | |
2784 | BUG_ON(ioctx->sense_data != cmd->sense_buffer); | |
2785 | if (cmd->se_cmd_flags & | |
2786 | (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE)) | |
2787 | WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION); | |
2788 | ioctx->queue_status_only = true; | |
b79fafac JE |
2789 | srpt_queue_response(cmd); |
2790 | return 0; | |
a42d985b BVA |
2791 | } |
2792 | ||
2793 | static void srpt_refresh_port_work(struct work_struct *work) | |
2794 | { | |
2795 | struct srpt_port *sport = container_of(work, struct srpt_port, work); | |
2796 | ||
2797 | srpt_refresh_port(sport); | |
2798 | } | |
2799 | ||
a1125314 BVA |
2800 | static bool srpt_ch_list_empty(struct srpt_port *sport) |
2801 | { | |
2802 | struct srpt_nexus *nexus; | |
2803 | bool res = true; | |
2804 | ||
2805 | rcu_read_lock(); | |
2806 | list_for_each_entry(nexus, &sport->nexus_list, entry) | |
2807 | if (!list_empty(&nexus->ch_list)) | |
2808 | res = false; | |
2809 | rcu_read_unlock(); | |
2810 | ||
2811 | return res; | |
2812 | } | |
2813 | ||
a42d985b | 2814 | /** |
ba60c84f BVA |
2815 | * srpt_release_sport - disable login and wait for associated channels |
2816 | * @sport: SRPT HCA port. | |
a42d985b | 2817 | */ |
ba60c84f | 2818 | static int srpt_release_sport(struct srpt_port *sport) |
a42d985b | 2819 | { |
a1125314 BVA |
2820 | struct srpt_nexus *nexus, *next_n; |
2821 | struct srpt_rdma_ch *ch; | |
a42d985b BVA |
2822 | |
2823 | WARN_ON_ONCE(irqs_disabled()); | |
2824 | ||
ba60c84f BVA |
2825 | mutex_lock(&sport->mutex); |
2826 | srpt_set_enabled(sport, false); | |
2827 | mutex_unlock(&sport->mutex); | |
a42d985b | 2828 | |
a1125314 BVA |
2829 | while (wait_event_timeout(sport->ch_releaseQ, |
2830 | srpt_ch_list_empty(sport), 5 * HZ) <= 0) { | |
2831 | pr_info("%s_%d: waiting for session unregistration ...\n", | |
2832 | sport->sdev->device->name, sport->port); | |
2833 | rcu_read_lock(); | |
2834 | list_for_each_entry(nexus, &sport->nexus_list, entry) { | |
2835 | list_for_each_entry(ch, &nexus->ch_list, list) { | |
2836 | pr_info("%s-%d: state %s\n", | |
2837 | ch->sess_name, ch->qp->qp_num, | |
2838 | get_ch_state_name(ch->state)); | |
2839 | } | |
2840 | } | |
2841 | rcu_read_unlock(); | |
2842 | } | |
2843 | ||
2844 | mutex_lock(&sport->mutex); | |
2845 | list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) { | |
2846 | list_del(&nexus->entry); | |
2847 | kfree_rcu(nexus, rcu); | |
2848 | } | |
2849 | mutex_unlock(&sport->mutex); | |
a42d985b BVA |
2850 | |
2851 | return 0; | |
2852 | } | |
2853 | ||
2bce1a6d | 2854 | static struct se_wwn *__srpt_lookup_wwn(const char *name) |
a42d985b BVA |
2855 | { |
2856 | struct ib_device *dev; | |
2857 | struct srpt_device *sdev; | |
2858 | struct srpt_port *sport; | |
2859 | int i; | |
2860 | ||
2861 | list_for_each_entry(sdev, &srpt_dev_list, list) { | |
2862 | dev = sdev->device; | |
2863 | if (!dev) | |
2864 | continue; | |
2865 | ||
2866 | for (i = 0; i < dev->phys_port_cnt; i++) { | |
2867 | sport = &sdev->port[i]; | |
2868 | ||
2bce1a6d BVA |
2869 | if (strcmp(sport->port_guid, name) == 0) |
2870 | return &sport->port_guid_wwn; | |
2871 | if (strcmp(sport->port_gid, name) == 0) | |
2872 | return &sport->port_gid_wwn; | |
a42d985b BVA |
2873 | } |
2874 | } | |
2875 | ||
2876 | return NULL; | |
2877 | } | |
2878 | ||
2bce1a6d | 2879 | static struct se_wwn *srpt_lookup_wwn(const char *name) |
a42d985b | 2880 | { |
2bce1a6d | 2881 | struct se_wwn *wwn; |
a42d985b BVA |
2882 | |
2883 | spin_lock(&srpt_dev_lock); | |
2bce1a6d | 2884 | wwn = __srpt_lookup_wwn(name); |
a42d985b BVA |
2885 | spin_unlock(&srpt_dev_lock); |
2886 | ||
2bce1a6d | 2887 | return wwn; |
a42d985b BVA |
2888 | } |
2889 | ||
c76d7d64 BVA |
2890 | static void srpt_free_srq(struct srpt_device *sdev) |
2891 | { | |
2892 | if (!sdev->srq) | |
2893 | return; | |
2894 | ||
2895 | ib_destroy_srq(sdev->srq); | |
2896 | srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev, | |
2897 | sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE); | |
2898 | sdev->srq = NULL; | |
2899 | } | |
2900 | ||
2901 | static int srpt_alloc_srq(struct srpt_device *sdev) | |
2902 | { | |
2903 | struct ib_srq_init_attr srq_attr = { | |
2904 | .event_handler = srpt_srq_event, | |
2905 | .srq_context = (void *)sdev, | |
2906 | .attr.max_wr = sdev->srq_size, | |
2907 | .attr.max_sge = 1, | |
2908 | .srq_type = IB_SRQT_BASIC, | |
2909 | }; | |
2910 | struct ib_device *device = sdev->device; | |
2911 | struct ib_srq *srq; | |
2912 | int i; | |
2913 | ||
2914 | WARN_ON_ONCE(sdev->srq); | |
2915 | srq = ib_create_srq(sdev->pd, &srq_attr); | |
2916 | if (IS_ERR(srq)) { | |
2917 | pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq)); | |
2918 | return PTR_ERR(srq); | |
2919 | } | |
2920 | ||
2921 | pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size, | |
2922 | sdev->device->attrs.max_srq_wr, device->name); | |
2923 | ||
2924 | sdev->ioctx_ring = (struct srpt_recv_ioctx **) | |
2925 | srpt_alloc_ioctx_ring(sdev, sdev->srq_size, | |
2926 | sizeof(*sdev->ioctx_ring[0]), | |
2927 | srp_max_req_size, DMA_FROM_DEVICE); | |
2928 | if (!sdev->ioctx_ring) { | |
2929 | ib_destroy_srq(srq); | |
2930 | return -ENOMEM; | |
2931 | } | |
2932 | ||
2933 | sdev->use_srq = true; | |
2934 | sdev->srq = srq; | |
2935 | ||
fcf58936 BVA |
2936 | for (i = 0; i < sdev->srq_size; ++i) { |
2937 | INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list); | |
c76d7d64 | 2938 | srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]); |
fcf58936 | 2939 | } |
c76d7d64 BVA |
2940 | |
2941 | return 0; | |
2942 | } | |
2943 | ||
2944 | static int srpt_use_srq(struct srpt_device *sdev, bool use_srq) | |
2945 | { | |
2946 | struct ib_device *device = sdev->device; | |
2947 | int ret = 0; | |
2948 | ||
2949 | if (!use_srq) { | |
2950 | srpt_free_srq(sdev); | |
2951 | sdev->use_srq = false; | |
2952 | } else if (use_srq && !sdev->srq) { | |
2953 | ret = srpt_alloc_srq(sdev); | |
2954 | } | |
2955 | pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__, device->name, | |
2956 | sdev->use_srq, ret); | |
2957 | return ret; | |
2958 | } | |
2959 | ||
a42d985b | 2960 | /** |
10eac19b BVA |
2961 | * srpt_add_one - InfiniBand device addition callback function |
2962 | * @device: Describes a HCA. | |
a42d985b BVA |
2963 | */ |
2964 | static void srpt_add_one(struct ib_device *device) | |
2965 | { | |
2966 | struct srpt_device *sdev; | |
2967 | struct srpt_port *sport; | |
63cf1a90 | 2968 | int i, ret; |
a42d985b | 2969 | |
e3dfa60c | 2970 | pr_debug("device = %p\n", device); |
a42d985b | 2971 | |
9d2aa2b4 | 2972 | sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); |
a42d985b BVA |
2973 | if (!sdev) |
2974 | goto err; | |
2975 | ||
2976 | sdev->device = device; | |
ba60c84f | 2977 | mutex_init(&sdev->sdev_mutex); |
a42d985b | 2978 | |
ed082d36 | 2979 | sdev->pd = ib_alloc_pd(device, 0); |
a42d985b BVA |
2980 | if (IS_ERR(sdev->pd)) |
2981 | goto free_dev; | |
2982 | ||
74333f12 | 2983 | sdev->lkey = sdev->pd->local_dma_lkey; |
a42d985b | 2984 | |
4a061b28 | 2985 | sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr); |
a42d985b | 2986 | |
c76d7d64 | 2987 | srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq); |
a42d985b BVA |
2988 | |
2989 | if (!srpt_service_guid) | |
2990 | srpt_service_guid = be64_to_cpu(device->node_guid); | |
2991 | ||
63cf1a90 BVA |
2992 | if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND) |
2993 | sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev); | |
2994 | if (IS_ERR(sdev->cm_id)) { | |
2995 | pr_info("ib_create_cm_id() failed: %ld\n", | |
2996 | PTR_ERR(sdev->cm_id)); | |
2997 | sdev->cm_id = NULL; | |
2998 | if (!rdma_cm_id) | |
2999 | goto err_ring; | |
3000 | } | |
a42d985b BVA |
3001 | |
3002 | /* print out target login information */ | |
3003 | pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx," | |
3004 | "pkey=ffff,service_id=%016llx\n", srpt_service_guid, | |
3005 | srpt_service_guid, srpt_service_guid); | |
3006 | ||
3007 | /* | |
3008 | * We do not have a consistent service_id (ie. also id_ext of target_id) | |
3009 | * to identify this target. We currently use the guid of the first HCA | |
3010 | * in the system as service_id; therefore, the target_id will change | |
3011 | * if this HCA is gone bad and replaced by different HCA | |
3012 | */ | |
63cf1a90 BVA |
3013 | ret = sdev->cm_id ? |
3014 | ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0) : | |
3015 | 0; | |
3016 | if (ret < 0) { | |
3017 | pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret, | |
3018 | sdev->cm_id->state); | |
a42d985b | 3019 | goto err_cm; |
63cf1a90 | 3020 | } |
a42d985b BVA |
3021 | |
3022 | INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device, | |
3023 | srpt_event_handler); | |
dcc9881e | 3024 | ib_register_event_handler(&sdev->event_handler); |
a42d985b | 3025 | |
f225066b | 3026 | WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port)); |
a42d985b BVA |
3027 | |
3028 | for (i = 1; i <= sdev->device->phys_port_cnt; i++) { | |
3029 | sport = &sdev->port[i - 1]; | |
a1125314 | 3030 | INIT_LIST_HEAD(&sport->nexus_list); |
ba60c84f BVA |
3031 | init_waitqueue_head(&sport->ch_releaseQ); |
3032 | mutex_init(&sport->mutex); | |
a42d985b BVA |
3033 | sport->sdev = sdev; |
3034 | sport->port = i; | |
3035 | sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE; | |
3036 | sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE; | |
3037 | sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE; | |
dea26209 | 3038 | sport->port_attrib.use_srq = false; |
a42d985b | 3039 | INIT_WORK(&sport->work, srpt_refresh_port_work); |
a42d985b BVA |
3040 | |
3041 | if (srpt_refresh_port(sport)) { | |
9f5d32af | 3042 | pr_err("MAD registration failed for %s-%d.\n", |
f68cba4e | 3043 | sdev->device->name, i); |
dea26209 | 3044 | goto err_event; |
a42d985b | 3045 | } |
a42d985b BVA |
3046 | } |
3047 | ||
3048 | spin_lock(&srpt_dev_lock); | |
3049 | list_add_tail(&sdev->list, &srpt_dev_list); | |
3050 | spin_unlock(&srpt_dev_lock); | |
3051 | ||
3052 | out: | |
3053 | ib_set_client_data(device, &srpt_client, sdev); | |
3054 | pr_debug("added %s.\n", device->name); | |
3055 | return; | |
3056 | ||
a42d985b BVA |
3057 | err_event: |
3058 | ib_unregister_event_handler(&sdev->event_handler); | |
3059 | err_cm: | |
63cf1a90 BVA |
3060 | if (sdev->cm_id) |
3061 | ib_destroy_cm_id(sdev->cm_id); | |
dea26209 | 3062 | err_ring: |
c76d7d64 | 3063 | srpt_free_srq(sdev); |
a42d985b BVA |
3064 | ib_dealloc_pd(sdev->pd); |
3065 | free_dev: | |
3066 | kfree(sdev); | |
3067 | err: | |
3068 | sdev = NULL; | |
9f5d32af | 3069 | pr_info("%s(%s) failed.\n", __func__, device->name); |
a42d985b BVA |
3070 | goto out; |
3071 | } | |
3072 | ||
3073 | /** | |
10eac19b BVA |
3074 | * srpt_remove_one - InfiniBand device removal callback function |
3075 | * @device: Describes a HCA. | |
3076 | * @client_data: The value passed as the third argument to ib_set_client_data(). | |
a42d985b | 3077 | */ |
7c1eb45a | 3078 | static void srpt_remove_one(struct ib_device *device, void *client_data) |
a42d985b | 3079 | { |
7c1eb45a | 3080 | struct srpt_device *sdev = client_data; |
a42d985b BVA |
3081 | int i; |
3082 | ||
a42d985b | 3083 | if (!sdev) { |
9f5d32af | 3084 | pr_info("%s(%s): nothing to do.\n", __func__, device->name); |
a42d985b BVA |
3085 | return; |
3086 | } | |
3087 | ||
3088 | srpt_unregister_mad_agent(sdev); | |
3089 | ||
3090 | ib_unregister_event_handler(&sdev->event_handler); | |
3091 | ||
3092 | /* Cancel any work queued by the just unregistered IB event handler. */ | |
3093 | for (i = 0; i < sdev->device->phys_port_cnt; i++) | |
3094 | cancel_work_sync(&sdev->port[i].work); | |
3095 | ||
63cf1a90 BVA |
3096 | if (sdev->cm_id) |
3097 | ib_destroy_cm_id(sdev->cm_id); | |
3098 | ||
3099 | ib_set_client_data(device, &srpt_client, NULL); | |
a42d985b BVA |
3100 | |
3101 | /* | |
3102 | * Unregistering a target must happen after destroying sdev->cm_id | |
3103 | * such that no new SRP_LOGIN_REQ information units can arrive while | |
3104 | * destroying the target. | |
3105 | */ | |
3106 | spin_lock(&srpt_dev_lock); | |
3107 | list_del(&sdev->list); | |
3108 | spin_unlock(&srpt_dev_lock); | |
ba60c84f BVA |
3109 | |
3110 | for (i = 0; i < sdev->device->phys_port_cnt; i++) | |
3111 | srpt_release_sport(&sdev->port[i]); | |
a42d985b | 3112 | |
c76d7d64 BVA |
3113 | srpt_free_srq(sdev); |
3114 | ||
a42d985b BVA |
3115 | ib_dealloc_pd(sdev->pd); |
3116 | ||
a42d985b BVA |
3117 | kfree(sdev); |
3118 | } | |
3119 | ||
3120 | static struct ib_client srpt_client = { | |
3121 | .name = DRV_NAME, | |
3122 | .add = srpt_add_one, | |
3123 | .remove = srpt_remove_one | |
3124 | }; | |
3125 | ||
3126 | static int srpt_check_true(struct se_portal_group *se_tpg) | |
3127 | { | |
3128 | return 1; | |
3129 | } | |
3130 | ||
3131 | static int srpt_check_false(struct se_portal_group *se_tpg) | |
3132 | { | |
3133 | return 0; | |
3134 | } | |
3135 | ||
3136 | static char *srpt_get_fabric_name(void) | |
3137 | { | |
3138 | return "srpt"; | |
3139 | } | |
3140 | ||
2bce1a6d BVA |
3141 | static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg) |
3142 | { | |
3143 | return tpg->se_tpg_wwn->priv; | |
3144 | } | |
3145 | ||
a42d985b BVA |
3146 | static char *srpt_get_fabric_wwn(struct se_portal_group *tpg) |
3147 | { | |
2bce1a6d | 3148 | struct srpt_port *sport = srpt_tpg_to_sport(tpg); |
a42d985b | 3149 | |
2bce1a6d BVA |
3150 | WARN_ON_ONCE(tpg != &sport->port_guid_tpg && |
3151 | tpg != &sport->port_gid_tpg); | |
3152 | return tpg == &sport->port_guid_tpg ? sport->port_guid : | |
3153 | sport->port_gid; | |
a42d985b BVA |
3154 | } |
3155 | ||
3156 | static u16 srpt_get_tag(struct se_portal_group *tpg) | |
3157 | { | |
3158 | return 1; | |
3159 | } | |
3160 | ||
a42d985b BVA |
3161 | static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg) |
3162 | { | |
3163 | return 1; | |
3164 | } | |
3165 | ||
3166 | static void srpt_release_cmd(struct se_cmd *se_cmd) | |
3167 | { | |
9474b043 NB |
3168 | struct srpt_send_ioctx *ioctx = container_of(se_cmd, |
3169 | struct srpt_send_ioctx, cmd); | |
3170 | struct srpt_rdma_ch *ch = ioctx->ch; | |
3c968887 | 3171 | unsigned long flags; |
9474b043 | 3172 | |
bd2c52d7 BVA |
3173 | WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE && |
3174 | !(ioctx->cmd.transport_state & CMD_T_ABORTED)); | |
9474b043 | 3175 | |
b99f8e4d CH |
3176 | if (ioctx->n_rw_ctx) { |
3177 | srpt_free_rw_ctxs(ch, ioctx); | |
3178 | ioctx->n_rw_ctx = 0; | |
9474b043 NB |
3179 | } |
3180 | ||
3c968887 BVA |
3181 | spin_lock_irqsave(&ch->spinlock, flags); |
3182 | list_add(&ioctx->free_list, &ch->free_list); | |
3183 | spin_unlock_irqrestore(&ch->spinlock, flags); | |
a42d985b BVA |
3184 | } |
3185 | ||
a42d985b | 3186 | /** |
10eac19b BVA |
3187 | * srpt_close_session - forcibly close a session |
3188 | * @se_sess: SCSI target session. | |
a42d985b BVA |
3189 | * |
3190 | * Callback function invoked by the TCM core to clean up sessions associated | |
3191 | * with a node ACL when the user invokes | |
3192 | * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
3193 | */ | |
3194 | static void srpt_close_session(struct se_session *se_sess) | |
3195 | { | |
f108f0f6 | 3196 | struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr; |
a42d985b | 3197 | |
01b3ee13 | 3198 | srpt_disconnect_ch_sync(ch); |
a42d985b BVA |
3199 | } |
3200 | ||
a42d985b | 3201 | /** |
10eac19b BVA |
3202 | * srpt_sess_get_index - return the value of scsiAttIntrPortIndex (SCSI-MIB) |
3203 | * @se_sess: SCSI target session. | |
a42d985b BVA |
3204 | * |
3205 | * A quote from RFC 4455 (SCSI-MIB) about this MIB object: | |
3206 | * This object represents an arbitrary integer used to uniquely identify a | |
3207 | * particular attached remote initiator port to a particular SCSI target port | |
3208 | * within a particular SCSI target device within a particular SCSI instance. | |
3209 | */ | |
3210 | static u32 srpt_sess_get_index(struct se_session *se_sess) | |
3211 | { | |
3212 | return 0; | |
3213 | } | |
3214 | ||
3215 | static void srpt_set_default_node_attrs(struct se_node_acl *nacl) | |
3216 | { | |
3217 | } | |
3218 | ||
a42d985b BVA |
3219 | /* Note: only used from inside debug printk's by the TCM core. */ |
3220 | static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd) | |
3221 | { | |
3222 | struct srpt_send_ioctx *ioctx; | |
3223 | ||
3224 | ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd); | |
dd3bec86 | 3225 | return ioctx->state; |
a42d985b BVA |
3226 | } |
3227 | ||
2bce1a6d BVA |
3228 | static int srpt_parse_guid(u64 *guid, const char *name) |
3229 | { | |
3230 | u16 w[4]; | |
3231 | int ret = -EINVAL; | |
3232 | ||
3233 | if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4) | |
3234 | goto out; | |
3235 | *guid = get_unaligned_be64(w); | |
3236 | ret = 0; | |
3237 | out: | |
3238 | return ret; | |
3239 | } | |
3240 | ||
a42d985b | 3241 | /** |
10eac19b | 3242 | * srpt_parse_i_port_id - parse an initiator port ID |
a42d985b BVA |
3243 | * @name: ASCII representation of a 128-bit initiator port ID. |
3244 | * @i_port_id: Binary 128-bit port ID. | |
3245 | */ | |
3246 | static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name) | |
3247 | { | |
3248 | const char *p; | |
3249 | unsigned len, count, leading_zero_bytes; | |
c70ca389 | 3250 | int ret; |
a42d985b BVA |
3251 | |
3252 | p = name; | |
b60459f0 | 3253 | if (strncasecmp(p, "0x", 2) == 0) |
a42d985b BVA |
3254 | p += 2; |
3255 | ret = -EINVAL; | |
3256 | len = strlen(p); | |
3257 | if (len % 2) | |
3258 | goto out; | |
3259 | count = min(len / 2, 16U); | |
3260 | leading_zero_bytes = 16 - count; | |
3261 | memset(i_port_id, 0, leading_zero_bytes); | |
c70ca389 | 3262 | ret = hex2bin(i_port_id + leading_zero_bytes, p, count); |
63cf1a90 | 3263 | |
a42d985b BVA |
3264 | out: |
3265 | return ret; | |
3266 | } | |
3267 | ||
3268 | /* | |
63cf1a90 BVA |
3269 | * configfs callback function invoked for mkdir |
3270 | * /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id | |
3271 | * | |
3272 | * i_port_id must be an initiator port GUID, GID or IP address. See also the | |
3273 | * target_alloc_session() calls in this driver. Examples of valid initiator | |
3274 | * port IDs: | |
3275 | * 0x0000000000000000505400fffe4a0b7b | |
3276 | * 0000000000000000505400fffe4a0b7b | |
3277 | * 5054:00ff:fe4a:0b7b | |
3278 | * 192.168.122.76 | |
a42d985b | 3279 | */ |
c7d6a803 | 3280 | static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name) |
a42d985b | 3281 | { |
63cf1a90 | 3282 | struct sockaddr_storage sa; |
2bce1a6d | 3283 | u64 guid; |
a42d985b | 3284 | u8 i_port_id[16]; |
2bce1a6d | 3285 | int ret; |
a42d985b | 3286 | |
2bce1a6d BVA |
3287 | ret = srpt_parse_guid(&guid, name); |
3288 | if (ret < 0) | |
3289 | ret = srpt_parse_i_port_id(i_port_id, name); | |
63cf1a90 BVA |
3290 | if (ret < 0) |
3291 | ret = inet_pton_with_scope(&init_net, AF_UNSPEC, name, NULL, | |
3292 | &sa); | |
2bce1a6d | 3293 | if (ret < 0) |
9f5d32af | 3294 | pr_err("invalid initiator port ID %s\n", name); |
2bce1a6d | 3295 | return ret; |
a42d985b BVA |
3296 | } |
3297 | ||
2eafd729 CH |
3298 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item, |
3299 | char *page) | |
a42d985b | 3300 | { |
2eafd729 | 3301 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3302 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3303 | |
3304 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size); | |
3305 | } | |
3306 | ||
2eafd729 CH |
3307 | static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item, |
3308 | const char *page, size_t count) | |
a42d985b | 3309 | { |
2eafd729 | 3310 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3311 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3312 | unsigned long val; |
3313 | int ret; | |
3314 | ||
9d8abf45 | 3315 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3316 | if (ret < 0) { |
9d8abf45 | 3317 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3318 | return -EINVAL; |
3319 | } | |
3320 | if (val > MAX_SRPT_RDMA_SIZE) { | |
3321 | pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val, | |
3322 | MAX_SRPT_RDMA_SIZE); | |
3323 | return -EINVAL; | |
3324 | } | |
3325 | if (val < DEFAULT_MAX_RDMA_SIZE) { | |
3326 | pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n", | |
3327 | val, DEFAULT_MAX_RDMA_SIZE); | |
3328 | return -EINVAL; | |
3329 | } | |
3330 | sport->port_attrib.srp_max_rdma_size = val; | |
3331 | ||
3332 | return count; | |
3333 | } | |
3334 | ||
2eafd729 CH |
3335 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item, |
3336 | char *page) | |
a42d985b | 3337 | { |
2eafd729 | 3338 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3339 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3340 | |
3341 | return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size); | |
3342 | } | |
3343 | ||
2eafd729 CH |
3344 | static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item, |
3345 | const char *page, size_t count) | |
a42d985b | 3346 | { |
2eafd729 | 3347 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3348 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3349 | unsigned long val; |
3350 | int ret; | |
3351 | ||
9d8abf45 | 3352 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3353 | if (ret < 0) { |
9d8abf45 | 3354 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3355 | return -EINVAL; |
3356 | } | |
3357 | if (val > MAX_SRPT_RSP_SIZE) { | |
3358 | pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val, | |
3359 | MAX_SRPT_RSP_SIZE); | |
3360 | return -EINVAL; | |
3361 | } | |
3362 | if (val < MIN_MAX_RSP_SIZE) { | |
3363 | pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val, | |
3364 | MIN_MAX_RSP_SIZE); | |
3365 | return -EINVAL; | |
3366 | } | |
3367 | sport->port_attrib.srp_max_rsp_size = val; | |
3368 | ||
3369 | return count; | |
3370 | } | |
3371 | ||
2eafd729 CH |
3372 | static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item, |
3373 | char *page) | |
a42d985b | 3374 | { |
2eafd729 | 3375 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3376 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3377 | |
3378 | return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size); | |
3379 | } | |
3380 | ||
2eafd729 CH |
3381 | static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item, |
3382 | const char *page, size_t count) | |
a42d985b | 3383 | { |
2eafd729 | 3384 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
2bce1a6d | 3385 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3386 | unsigned long val; |
3387 | int ret; | |
3388 | ||
9d8abf45 | 3389 | ret = kstrtoul(page, 0, &val); |
a42d985b | 3390 | if (ret < 0) { |
9d8abf45 | 3391 | pr_err("kstrtoul() failed with ret: %d\n", ret); |
a42d985b BVA |
3392 | return -EINVAL; |
3393 | } | |
3394 | if (val > MAX_SRPT_SRQ_SIZE) { | |
3395 | pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val, | |
3396 | MAX_SRPT_SRQ_SIZE); | |
3397 | return -EINVAL; | |
3398 | } | |
3399 | if (val < MIN_SRPT_SRQ_SIZE) { | |
3400 | pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val, | |
3401 | MIN_SRPT_SRQ_SIZE); | |
3402 | return -EINVAL; | |
3403 | } | |
3404 | sport->port_attrib.srp_sq_size = val; | |
3405 | ||
3406 | return count; | |
3407 | } | |
3408 | ||
dea26209 BVA |
3409 | static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item, |
3410 | char *page) | |
3411 | { | |
3412 | struct se_portal_group *se_tpg = attrib_to_tpg(item); | |
3413 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); | |
3414 | ||
3415 | return sprintf(page, "%d\n", sport->port_attrib.use_srq); | |
3416 | } | |
3417 | ||
3418 | static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item, | |
3419 | const char *page, size_t count) | |
3420 | { | |
3421 | struct se_portal_group *se_tpg = attrib_to_tpg(item); | |
3422 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); | |
57b0c460 | 3423 | struct srpt_device *sdev = sport->sdev; |
dea26209 | 3424 | unsigned long val; |
57b0c460 | 3425 | bool enabled; |
dea26209 BVA |
3426 | int ret; |
3427 | ||
3428 | ret = kstrtoul(page, 0, &val); | |
3429 | if (ret < 0) | |
3430 | return ret; | |
3431 | if (val != !!val) | |
3432 | return -EINVAL; | |
57b0c460 | 3433 | |
ba60c84f | 3434 | ret = mutex_lock_interruptible(&sdev->sdev_mutex); |
57b0c460 BVA |
3435 | if (ret < 0) |
3436 | return ret; | |
ba60c84f BVA |
3437 | ret = mutex_lock_interruptible(&sport->mutex); |
3438 | if (ret < 0) | |
3439 | goto unlock_sdev; | |
57b0c460 BVA |
3440 | enabled = sport->enabled; |
3441 | /* Log out all initiator systems before changing 'use_srq'. */ | |
3442 | srpt_set_enabled(sport, false); | |
dea26209 | 3443 | sport->port_attrib.use_srq = val; |
57b0c460 BVA |
3444 | srpt_use_srq(sdev, sport->port_attrib.use_srq); |
3445 | srpt_set_enabled(sport, enabled); | |
ba60c84f BVA |
3446 | ret = count; |
3447 | mutex_unlock(&sport->mutex); | |
3448 | unlock_sdev: | |
3449 | mutex_unlock(&sdev->sdev_mutex); | |
dea26209 | 3450 | |
ba60c84f | 3451 | return ret; |
dea26209 BVA |
3452 | } |
3453 | ||
2eafd729 CH |
3454 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size); |
3455 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size); | |
3456 | CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size); | |
dea26209 | 3457 | CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq); |
a42d985b BVA |
3458 | |
3459 | static struct configfs_attribute *srpt_tpg_attrib_attrs[] = { | |
2eafd729 CH |
3460 | &srpt_tpg_attrib_attr_srp_max_rdma_size, |
3461 | &srpt_tpg_attrib_attr_srp_max_rsp_size, | |
3462 | &srpt_tpg_attrib_attr_srp_sq_size, | |
dea26209 | 3463 | &srpt_tpg_attrib_attr_use_srq, |
a42d985b BVA |
3464 | NULL, |
3465 | }; | |
3466 | ||
63cf1a90 BVA |
3467 | static struct rdma_cm_id *srpt_create_rdma_id(struct sockaddr *listen_addr) |
3468 | { | |
3469 | struct rdma_cm_id *rdma_cm_id; | |
3470 | int ret; | |
3471 | ||
3472 | rdma_cm_id = rdma_create_id(&init_net, srpt_rdma_cm_handler, | |
3473 | NULL, RDMA_PS_TCP, IB_QPT_RC); | |
3474 | if (IS_ERR(rdma_cm_id)) { | |
3475 | pr_err("RDMA/CM ID creation failed: %ld\n", | |
3476 | PTR_ERR(rdma_cm_id)); | |
3477 | goto out; | |
3478 | } | |
3479 | ||
3480 | ret = rdma_bind_addr(rdma_cm_id, listen_addr); | |
3481 | if (ret) { | |
3482 | char addr_str[64]; | |
3483 | ||
3484 | snprintf(addr_str, sizeof(addr_str), "%pISp", listen_addr); | |
3485 | pr_err("Binding RDMA/CM ID to address %s failed: %d\n", | |
3486 | addr_str, ret); | |
3487 | rdma_destroy_id(rdma_cm_id); | |
3488 | rdma_cm_id = ERR_PTR(ret); | |
3489 | goto out; | |
3490 | } | |
3491 | ||
3492 | ret = rdma_listen(rdma_cm_id, 128); | |
3493 | if (ret) { | |
3494 | pr_err("rdma_listen() failed: %d\n", ret); | |
3495 | rdma_destroy_id(rdma_cm_id); | |
3496 | rdma_cm_id = ERR_PTR(ret); | |
3497 | } | |
3498 | ||
3499 | out: | |
3500 | return rdma_cm_id; | |
3501 | } | |
3502 | ||
3503 | static ssize_t srpt_rdma_cm_port_show(struct config_item *item, char *page) | |
3504 | { | |
3505 | return sprintf(page, "%d\n", rdma_cm_port); | |
3506 | } | |
3507 | ||
3508 | static ssize_t srpt_rdma_cm_port_store(struct config_item *item, | |
3509 | const char *page, size_t count) | |
3510 | { | |
3511 | struct sockaddr_in addr4 = { .sin_family = AF_INET }; | |
3512 | struct sockaddr_in6 addr6 = { .sin6_family = AF_INET6 }; | |
3513 | struct rdma_cm_id *new_id = NULL; | |
3514 | u16 val; | |
3515 | int ret; | |
3516 | ||
3517 | ret = kstrtou16(page, 0, &val); | |
3518 | if (ret < 0) | |
3519 | return ret; | |
3520 | ret = count; | |
3521 | if (rdma_cm_port == val) | |
3522 | goto out; | |
3523 | ||
3524 | if (val) { | |
3525 | addr6.sin6_port = cpu_to_be16(val); | |
3526 | new_id = srpt_create_rdma_id((struct sockaddr *)&addr6); | |
3527 | if (IS_ERR(new_id)) { | |
3528 | addr4.sin_port = cpu_to_be16(val); | |
3529 | new_id = srpt_create_rdma_id((struct sockaddr *)&addr4); | |
3530 | if (IS_ERR(new_id)) { | |
3531 | ret = PTR_ERR(new_id); | |
3532 | goto out; | |
3533 | } | |
3534 | } | |
3535 | } | |
3536 | ||
3537 | mutex_lock(&rdma_cm_mutex); | |
3538 | rdma_cm_port = val; | |
3539 | swap(rdma_cm_id, new_id); | |
3540 | mutex_unlock(&rdma_cm_mutex); | |
3541 | ||
3542 | if (new_id) | |
3543 | rdma_destroy_id(new_id); | |
3544 | ret = count; | |
3545 | out: | |
3546 | return ret; | |
3547 | } | |
3548 | ||
3549 | CONFIGFS_ATTR(srpt_, rdma_cm_port); | |
3550 | ||
3551 | static struct configfs_attribute *srpt_da_attrs[] = { | |
3552 | &srpt_attr_rdma_cm_port, | |
3553 | NULL, | |
3554 | }; | |
3555 | ||
2eafd729 | 3556 | static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page) |
a42d985b | 3557 | { |
2eafd729 | 3558 | struct se_portal_group *se_tpg = to_tpg(item); |
2bce1a6d | 3559 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3560 | |
3561 | return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0); | |
3562 | } | |
3563 | ||
2eafd729 CH |
3564 | static ssize_t srpt_tpg_enable_store(struct config_item *item, |
3565 | const char *page, size_t count) | |
a42d985b | 3566 | { |
2eafd729 | 3567 | struct se_portal_group *se_tpg = to_tpg(item); |
2bce1a6d | 3568 | struct srpt_port *sport = srpt_tpg_to_sport(se_tpg); |
a42d985b BVA |
3569 | unsigned long tmp; |
3570 | int ret; | |
3571 | ||
9d8abf45 | 3572 | ret = kstrtoul(page, 0, &tmp); |
a42d985b | 3573 | if (ret < 0) { |
9f5d32af | 3574 | pr_err("Unable to extract srpt_tpg_store_enable\n"); |
a42d985b BVA |
3575 | return -EINVAL; |
3576 | } | |
3577 | ||
3578 | if ((tmp != 0) && (tmp != 1)) { | |
9f5d32af | 3579 | pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp); |
a42d985b BVA |
3580 | return -EINVAL; |
3581 | } | |
a42d985b | 3582 | |
ba60c84f | 3583 | mutex_lock(&sport->mutex); |
8b6dc529 | 3584 | srpt_set_enabled(sport, tmp); |
ba60c84f | 3585 | mutex_unlock(&sport->mutex); |
043a6806 | 3586 | |
a42d985b BVA |
3587 | return count; |
3588 | } | |
3589 | ||
2eafd729 | 3590 | CONFIGFS_ATTR(srpt_tpg_, enable); |
a42d985b BVA |
3591 | |
3592 | static struct configfs_attribute *srpt_tpg_attrs[] = { | |
2eafd729 | 3593 | &srpt_tpg_attr_enable, |
a42d985b BVA |
3594 | NULL, |
3595 | }; | |
3596 | ||
3597 | /** | |
10eac19b BVA |
3598 | * srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg |
3599 | * @wwn: Corresponds to $driver/$port. | |
3600 | * @group: Not used. | |
3601 | * @name: $tpg. | |
a42d985b BVA |
3602 | */ |
3603 | static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn, | |
3604 | struct config_group *group, | |
3605 | const char *name) | |
3606 | { | |
2bce1a6d BVA |
3607 | struct srpt_port *sport = wwn->priv; |
3608 | static struct se_portal_group *tpg; | |
a42d985b BVA |
3609 | int res; |
3610 | ||
2bce1a6d BVA |
3611 | WARN_ON_ONCE(wwn != &sport->port_guid_wwn && |
3612 | wwn != &sport->port_gid_wwn); | |
3613 | tpg = wwn == &sport->port_guid_wwn ? &sport->port_guid_tpg : | |
3614 | &sport->port_gid_tpg; | |
3615 | res = core_tpg_register(wwn, tpg, SCSI_PROTOCOL_SRP); | |
a42d985b BVA |
3616 | if (res) |
3617 | return ERR_PTR(res); | |
3618 | ||
2bce1a6d | 3619 | return tpg; |
a42d985b BVA |
3620 | } |
3621 | ||
3622 | /** | |
10eac19b BVA |
3623 | * srpt_drop_tpg - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port/$tpg |
3624 | * @tpg: Target portal group to deregister. | |
a42d985b BVA |
3625 | */ |
3626 | static void srpt_drop_tpg(struct se_portal_group *tpg) | |
3627 | { | |
2bce1a6d | 3628 | struct srpt_port *sport = srpt_tpg_to_sport(tpg); |
a42d985b BVA |
3629 | |
3630 | sport->enabled = false; | |
2bce1a6d | 3631 | core_tpg_deregister(tpg); |
a42d985b BVA |
3632 | } |
3633 | ||
3634 | /** | |
10eac19b BVA |
3635 | * srpt_make_tport - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port |
3636 | * @tf: Not used. | |
3637 | * @group: Not used. | |
3638 | * @name: $port. | |
a42d985b BVA |
3639 | */ |
3640 | static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf, | |
3641 | struct config_group *group, | |
3642 | const char *name) | |
3643 | { | |
2bce1a6d | 3644 | return srpt_lookup_wwn(name) ? : ERR_PTR(-EINVAL); |
a42d985b BVA |
3645 | } |
3646 | ||
3647 | /** | |
10eac19b BVA |
3648 | * srpt_drop_tport - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port |
3649 | * @wwn: $port. | |
a42d985b BVA |
3650 | */ |
3651 | static void srpt_drop_tport(struct se_wwn *wwn) | |
3652 | { | |
a42d985b BVA |
3653 | } |
3654 | ||
2eafd729 | 3655 | static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf) |
a42d985b BVA |
3656 | { |
3657 | return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION); | |
3658 | } | |
3659 | ||
2eafd729 | 3660 | CONFIGFS_ATTR_RO(srpt_wwn_, version); |
a42d985b BVA |
3661 | |
3662 | static struct configfs_attribute *srpt_wwn_attrs[] = { | |
2eafd729 | 3663 | &srpt_wwn_attr_version, |
a42d985b BVA |
3664 | NULL, |
3665 | }; | |
3666 | ||
9ac8928e CH |
3667 | static const struct target_core_fabric_ops srpt_template = { |
3668 | .module = THIS_MODULE, | |
3669 | .name = "srpt", | |
a42d985b | 3670 | .get_fabric_name = srpt_get_fabric_name, |
a42d985b BVA |
3671 | .tpg_get_wwn = srpt_get_fabric_wwn, |
3672 | .tpg_get_tag = srpt_get_tag, | |
a42d985b BVA |
3673 | .tpg_check_demo_mode = srpt_check_false, |
3674 | .tpg_check_demo_mode_cache = srpt_check_true, | |
3675 | .tpg_check_demo_mode_write_protect = srpt_check_true, | |
3676 | .tpg_check_prod_mode_write_protect = srpt_check_false, | |
a42d985b BVA |
3677 | .tpg_get_inst_index = srpt_tpg_get_inst_index, |
3678 | .release_cmd = srpt_release_cmd, | |
3679 | .check_stop_free = srpt_check_stop_free, | |
a42d985b | 3680 | .close_session = srpt_close_session, |
a42d985b BVA |
3681 | .sess_get_index = srpt_sess_get_index, |
3682 | .sess_get_initiator_sid = NULL, | |
3683 | .write_pending = srpt_write_pending, | |
3684 | .write_pending_status = srpt_write_pending_status, | |
3685 | .set_default_node_attributes = srpt_set_default_node_attrs, | |
a42d985b | 3686 | .get_cmd_state = srpt_get_tcm_cmd_state, |
b79fafac | 3687 | .queue_data_in = srpt_queue_data_in, |
a42d985b | 3688 | .queue_status = srpt_queue_status, |
b79fafac | 3689 | .queue_tm_rsp = srpt_queue_tm_rsp, |
131e6abc | 3690 | .aborted_task = srpt_aborted_task, |
a42d985b BVA |
3691 | /* |
3692 | * Setup function pointers for generic logic in | |
3693 | * target_core_fabric_configfs.c | |
3694 | */ | |
3695 | .fabric_make_wwn = srpt_make_tport, | |
3696 | .fabric_drop_wwn = srpt_drop_tport, | |
3697 | .fabric_make_tpg = srpt_make_tpg, | |
3698 | .fabric_drop_tpg = srpt_drop_tpg, | |
c7d6a803 | 3699 | .fabric_init_nodeacl = srpt_init_nodeacl, |
9ac8928e | 3700 | |
63cf1a90 | 3701 | .tfc_discovery_attrs = srpt_da_attrs, |
9ac8928e CH |
3702 | .tfc_wwn_attrs = srpt_wwn_attrs, |
3703 | .tfc_tpg_base_attrs = srpt_tpg_attrs, | |
3704 | .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs, | |
a42d985b BVA |
3705 | }; |
3706 | ||
3707 | /** | |
10eac19b | 3708 | * srpt_init_module - kernel module initialization |
a42d985b BVA |
3709 | * |
3710 | * Note: Since ib_register_client() registers callback functions, and since at | |
3711 | * least one of these callback functions (srpt_add_one()) calls target core | |
3712 | * functions, this driver must be registered with the target core before | |
3713 | * ib_register_client() is called. | |
3714 | */ | |
3715 | static int __init srpt_init_module(void) | |
3716 | { | |
3717 | int ret; | |
3718 | ||
3719 | ret = -EINVAL; | |
3720 | if (srp_max_req_size < MIN_MAX_REQ_SIZE) { | |
9f5d32af | 3721 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3722 | " srp_max_req_size -- must be at least %d.\n", |
3723 | srp_max_req_size, MIN_MAX_REQ_SIZE); | |
3724 | goto out; | |
3725 | } | |
3726 | ||
3727 | if (srpt_srq_size < MIN_SRPT_SRQ_SIZE | |
3728 | || srpt_srq_size > MAX_SRPT_SRQ_SIZE) { | |
9f5d32af | 3729 | pr_err("invalid value %d for kernel module parameter" |
a42d985b BVA |
3730 | " srpt_srq_size -- must be in the range [%d..%d].\n", |
3731 | srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE); | |
3732 | goto out; | |
3733 | } | |
3734 | ||
9ac8928e CH |
3735 | ret = target_register_template(&srpt_template); |
3736 | if (ret) | |
a42d985b | 3737 | goto out; |
a42d985b BVA |
3738 | |
3739 | ret = ib_register_client(&srpt_client); | |
3740 | if (ret) { | |
9f5d32af | 3741 | pr_err("couldn't register IB client\n"); |
a42d985b BVA |
3742 | goto out_unregister_target; |
3743 | } | |
3744 | ||
3745 | return 0; | |
3746 | ||
3747 | out_unregister_target: | |
9ac8928e | 3748 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3749 | out: |
3750 | return ret; | |
3751 | } | |
3752 | ||
3753 | static void __exit srpt_cleanup_module(void) | |
3754 | { | |
63cf1a90 BVA |
3755 | if (rdma_cm_id) |
3756 | rdma_destroy_id(rdma_cm_id); | |
a42d985b | 3757 | ib_unregister_client(&srpt_client); |
9ac8928e | 3758 | target_unregister_template(&srpt_template); |
a42d985b BVA |
3759 | } |
3760 | ||
3761 | module_init(srpt_init_module); | |
3762 | module_exit(srpt_cleanup_module); |