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IB/srpt: Introduce srpt_disconnect_ch_sync()
[linux-2.6-block.git] / drivers / infiniband / ulp / srpt / ib_srpt.c
CommitLineData
a42d985b
BVA		 1/*
2 * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
3 * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 *
33 */
34
35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/ctype.h>
40#include <linux/kthread.h>
41#include <linux/string.h>
42#include <linux/delay.h>
43#include <linux/atomic.h>
ba929992 44#include <scsi/scsi_proto.h>
a42d985b 45#include <scsi/scsi_tcq.h>
a42d985b 46#include <target/target_core_base.h>
a42d985b 47#include <target/target_core_fabric.h>
a42d985b
BVA		 48#include "ib_srpt.h"
49
50/* Name of this kernel module. */
51#define DRV_NAME "ib_srpt"
52#define DRV_VERSION "2.0.0"
53#define DRV_RELDATE "2011-02-14"
54
55#define SRPT_ID_STRING "Linux SRP target"
56
57#undef pr_fmt
58#define pr_fmt(fmt) DRV_NAME " " fmt
59
60MODULE_AUTHOR("Vu Pham and Bart Van Assche");
61MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63MODULE_LICENSE("Dual BSD/GPL");
64
65/*
66 * Global Variables
67 */
68
69static u64 srpt_service_guid;
486d8b9f
RD		 70static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */
71static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */
a42d985b
BVA		 72
73static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
74module_param(srp_max_req_size, int, 0444);
75MODULE_PARM_DESC(srp_max_req_size,
76 "Maximum size of SRP request messages in bytes.");
77
78static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
79module_param(srpt_srq_size, int, 0444);
80MODULE_PARM_DESC(srpt_srq_size,
81 "Shared receive queue (SRQ) size.");
82
83static int srpt_get_u64_x(char *buffer, struct kernel_param *kp)
84{
85 return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
86}
87module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
88 0444);
89MODULE_PARM_DESC(srpt_service_guid,
90 "Using this value for ioc_guid, id_ext, and cm_listen_id"
91 " instead of using the node_guid of the first HCA.");
92
93static struct ib_client srpt_client;
2c7f37ff 94static void srpt_release_cmd(struct se_cmd *se_cmd);
aaf45bd8 95static void srpt_free_ch(struct kref *kref);
a42d985b 96static int srpt_queue_status(struct se_cmd *cmd);
59fae4de
CH		 97static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
98static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
387add46 99static void srpt_process_wait_list(struct srpt_rdma_ch *ch);
a42d985b 100
f130c220
BVA		 101/*
102 * The only allowed channel state changes are those that change the channel
103 * state into a state with a higher numerical value. Hence the new > prev test.
a42d985b 104 */
f130c220 105static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new)
a42d985b
BVA		 106{
107 unsigned long flags;
108 enum rdma_ch_state prev;
f130c220 109 bool changed = false;
a42d985b
BVA		 110
111 spin_lock_irqsave(&ch->spinlock, flags);
112 prev = ch->state;
f130c220 113 if (new > prev) {
a42d985b 114 ch->state = new;
f130c220
BVA		 115 changed = true;
116 }
a42d985b 117 spin_unlock_irqrestore(&ch->spinlock, flags);
f130c220
BVA		 118
119 return changed;
a42d985b
BVA		 120}
121
122/**
123 * srpt_event_handler() - Asynchronous IB event callback function.
124 *
125 * Callback function called by the InfiniBand core when an asynchronous IB
126 * event occurs. This callback may occur in interrupt context. See also
127 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
128 * Architecture Specification.
129 */
130static void srpt_event_handler(struct ib_event_handler *handler,
131 struct ib_event *event)
132{
133 struct srpt_device *sdev;
134 struct srpt_port *sport;
135
136 sdev = ib_get_client_data(event->device, &srpt_client);
137 if (!sdev || sdev->device != event->device)
138 return;
139
140 pr_debug("ASYNC event= %d on device= %s\n", event->event,
f68cba4e 141 sdev->device->name);
a42d985b
BVA		 142
143 switch (event->event) {
144 case IB_EVENT_PORT_ERR:
145 if (event->element.port_num <= sdev->device->phys_port_cnt) {
146 sport = &sdev->port[event->element.port_num - 1];
147 sport->lid = 0;
148 sport->sm_lid = 0;
149 }
150 break;
151 case IB_EVENT_PORT_ACTIVE:
152 case IB_EVENT_LID_CHANGE:
153 case IB_EVENT_PKEY_CHANGE:
154 case IB_EVENT_SM_CHANGE:
155 case IB_EVENT_CLIENT_REREGISTER:
2aa1cf64 156 case IB_EVENT_GID_CHANGE:
a42d985b
BVA		 157 /* Refresh port data asynchronously. */
158 if (event->element.port_num <= sdev->device->phys_port_cnt) {
159 sport = &sdev->port[event->element.port_num - 1];
160 if (!sport->lid && !sport->sm_lid)
161 schedule_work(&sport->work);
162 }
163 break;
164 default:
9f5d32af 165 pr_err("received unrecognized IB event %d\n",
a42d985b
BVA		 166 event->event);
167 break;
168 }
169}
170
171/**
172 * srpt_srq_event() - SRQ event callback function.
173 */
174static void srpt_srq_event(struct ib_event *event, void *ctx)
175{
9f5d32af 176 pr_info("SRQ event %d\n", event->event);
a42d985b
BVA		 177}
178
aaf45bd8
BVA		 179static const char *get_ch_state_name(enum rdma_ch_state s)
180{
181 switch (s) {
182 case CH_CONNECTING:
183 return "connecting";
184 case CH_LIVE:
185 return "live";
186 case CH_DISCONNECTING:
187 return "disconnecting";
188 case CH_DRAINING:
189 return "draining";
190 case CH_DISCONNECTED:
191 return "disconnected";
192 }
193 return "???";
194}
195
a42d985b
BVA		 196/**
197 * srpt_qp_event() - QP event callback function.
198 */
199static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
200{
201 pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n",
33912d73 202 event->event, ch->cm_id, ch->sess_name, ch->state);
a42d985b
BVA		 203
204 switch (event->event) {
205 case IB_EVENT_COMM_EST:
206 ib_cm_notify(ch->cm_id, event->event);
207 break;
208 case IB_EVENT_QP_LAST_WQE_REACHED:
aaf45bd8
BVA		 209 pr_debug("%s-%d, state %s: received Last WQE event.\n",
210 ch->sess_name, ch->qp->qp_num,
211 get_ch_state_name(ch->state));
a42d985b
BVA		 212 break;
213 default:
9f5d32af 214 pr_err("received unrecognized IB QP event %d\n", event->event);
a42d985b
BVA		 215 break;
216 }
217}
218
219/**
220 * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure.
221 *
222 * @slot: one-based slot number.
223 * @value: four-bit value.
224 *
225 * Copies the lowest four bits of value in element slot of the array of four
226 * bit elements called c_list (controller list). The index slot is one-based.
227 */
228static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
229{
230 u16 id;
231 u8 tmp;
232
233 id = (slot - 1) / 2;
234 if (slot & 0x1) {
235 tmp = c_list[id] & 0xf;
236 c_list[id] = (value << 4) | tmp;
237 } else {
238 tmp = c_list[id] & 0xf0;
239 c_list[id] = (value & 0xf) | tmp;
240 }
241}
242
243/**
244 * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram.
245 *
246 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
247 * Specification.
248 */
249static void srpt_get_class_port_info(struct ib_dm_mad *mad)
250{
251 struct ib_class_port_info *cif;
252
253 cif = (struct ib_class_port_info *)mad->data;
9d2aa2b4 254 memset(cif, 0, sizeof(*cif));
a42d985b
BVA		 255 cif->base_version = 1;
256 cif->class_version = 1;
a42d985b 257
507f6afa 258 ib_set_cpi_resp_time(cif, 20);
a42d985b
BVA		 259 mad->mad_hdr.status = 0;
260}
261
262/**
263 * srpt_get_iou() - Write IOUnitInfo to a management datagram.
264 *
265 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
266 * Specification. See also section B.7, table B.6 in the SRP r16a document.
267 */
268static void srpt_get_iou(struct ib_dm_mad *mad)
269{
270 struct ib_dm_iou_info *ioui;
271 u8 slot;
272 int i;
273
274 ioui = (struct ib_dm_iou_info *)mad->data;
b356c1c1 275 ioui->change_id = cpu_to_be16(1);
a42d985b
BVA		 276 ioui->max_controllers = 16;
277
278 /* set present for slot 1 and empty for the rest */
279 srpt_set_ioc(ioui->controller_list, 1, 1);
280 for (i = 1, slot = 2; i < 16; i++, slot++)
281 srpt_set_ioc(ioui->controller_list, slot, 0);
282
283 mad->mad_hdr.status = 0;
284}
285
286/**
287 * srpt_get_ioc() - Write IOControllerprofile to a management datagram.
288 *
289 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
290 * Architecture Specification. See also section B.7, table B.7 in the SRP
291 * r16a document.
292 */
293static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
294 struct ib_dm_mad *mad)
295{
296 struct srpt_device *sdev = sport->sdev;
297 struct ib_dm_ioc_profile *iocp;
dea26209 298 int send_queue_depth;
a42d985b
BVA		 299
300 iocp = (struct ib_dm_ioc_profile *)mad->data;
301
302 if (!slot || slot > 16) {
303 mad->mad_hdr.status
b356c1c1 304 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
a42d985b
BVA		 305 return;
306 }
307
308 if (slot > 2) {
309 mad->mad_hdr.status
b356c1c1 310 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
a42d985b
BVA		 311 return;
312 }
313
dea26209
BVA		 314 if (sdev->use_srq)
315 send_queue_depth = sdev->srq_size;
316 else
317 send_queue_depth = min(SRPT_RQ_SIZE,
318 sdev->device->attrs.max_qp_wr);
319
9d2aa2b4 320 memset(iocp, 0, sizeof(*iocp));
a42d985b
BVA		 321 strcpy(iocp->id_string, SRPT_ID_STRING);
322 iocp->guid = cpu_to_be64(srpt_service_guid);
4a061b28
OG		 323 iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
324 iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);
325 iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);
326 iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
a42d985b 327 iocp->subsys_device_id = 0x0;
b356c1c1
VT		 328 iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
329 iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
330 iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
331 iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
dea26209 332 iocp->send_queue_depth = cpu_to_be16(send_queue_depth);
a42d985b
BVA		 333 iocp->rdma_read_depth = 4;
334 iocp->send_size = cpu_to_be32(srp_max_req_size);
335 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
336 1U << 24));
337 iocp->num_svc_entries = 1;
338 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
339 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
340
341 mad->mad_hdr.status = 0;
342}
343
344/**
345 * srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
346 *
347 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
348 * Specification. See also section B.7, table B.8 in the SRP r16a document.
349 */
350static void srpt_get_svc_entries(u64 ioc_guid,
351 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
352{
353 struct ib_dm_svc_entries *svc_entries;
354
355 WARN_ON(!ioc_guid);
356
357 if (!slot || slot > 16) {
358 mad->mad_hdr.status
b356c1c1 359 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
a42d985b
BVA		 360 return;
361 }
362
363 if (slot > 2 || lo > hi || hi > 1) {
364 mad->mad_hdr.status
b356c1c1 365 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
a42d985b
BVA		 366 return;
367 }
368
369 svc_entries = (struct ib_dm_svc_entries *)mad->data;
9d2aa2b4 370 memset(svc_entries, 0, sizeof(*svc_entries));
a42d985b
BVA		 371 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
372 snprintf(svc_entries->service_entries[0].name,
373 sizeof(svc_entries->service_entries[0].name),
374 "%s%016llx",
375 SRP_SERVICE_NAME_PREFIX,
376 ioc_guid);
377
378 mad->mad_hdr.status = 0;
379}
380
381/**
382 * srpt_mgmt_method_get() - Process a received management datagram.
383 * @sp: source port through which the MAD has been received.
384 * @rq_mad: received MAD.
385 * @rsp_mad: response MAD.
386 */
387static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
388 struct ib_dm_mad *rsp_mad)
389{
390 u16 attr_id;
391 u32 slot;
392 u8 hi, lo;
393
394 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
395 switch (attr_id) {
396 case DM_ATTR_CLASS_PORT_INFO:
397 srpt_get_class_port_info(rsp_mad);
398 break;
399 case DM_ATTR_IOU_INFO:
400 srpt_get_iou(rsp_mad);
401 break;
402 case DM_ATTR_IOC_PROFILE:
403 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
404 srpt_get_ioc(sp, slot, rsp_mad);
405 break;
406 case DM_ATTR_SVC_ENTRIES:
407 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
408 hi = (u8) ((slot >> 8) & 0xff);
409 lo = (u8) (slot & 0xff);
410 slot = (u16) ((slot >> 16) & 0xffff);
411 srpt_get_svc_entries(srpt_service_guid,
412 slot, hi, lo, rsp_mad);
413 break;
414 default:
415 rsp_mad->mad_hdr.status =
b356c1c1 416 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
a42d985b
BVA		 417 break;
418 }
419}
420
421/**
422 * srpt_mad_send_handler() - Post MAD-send callback function.
423 */
424static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
425 struct ib_mad_send_wc *mad_wc)
426{
36523159 427 rdma_destroy_ah(mad_wc->send_buf->ah);
a42d985b
BVA		 428 ib_free_send_mad(mad_wc->send_buf);
429}
430
431/**
432 * srpt_mad_recv_handler() - MAD reception callback function.
433 */
434static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
ca281265 435 struct ib_mad_send_buf *send_buf,
a42d985b
BVA		 436 struct ib_mad_recv_wc *mad_wc)
437{
438 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
439 struct ib_ah *ah;
440 struct ib_mad_send_buf *rsp;
441 struct ib_dm_mad *dm_mad;
442
443 if (!mad_wc || !mad_wc->recv_buf.mad)
444 return;
445
446 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
447 mad_wc->recv_buf.grh, mad_agent->port_num);
448 if (IS_ERR(ah))
449 goto err;
450
451 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
452
453 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
454 mad_wc->wc->pkey_index, 0,
455 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
da2dfaa3
IW		 456 GFP_KERNEL,
457 IB_MGMT_BASE_VERSION);
a42d985b
BVA		 458 if (IS_ERR(rsp))
459 goto err_rsp;
460
461 rsp->ah = ah;
462
463 dm_mad = rsp->mad;
9d2aa2b4 464 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad));
a42d985b
BVA		 465 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
466 dm_mad->mad_hdr.status = 0;
467
468 switch (mad_wc->recv_buf.mad->mad_hdr.method) {
469 case IB_MGMT_METHOD_GET:
470 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
471 break;
472 case IB_MGMT_METHOD_SET:
473 dm_mad->mad_hdr.status =
b356c1c1 474 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
a42d985b
BVA		 475 break;
476 default:
477 dm_mad->mad_hdr.status =
b356c1c1 478 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
a42d985b
BVA		 479 break;
480 }
481
482 if (!ib_post_send_mad(rsp, NULL)) {
483 ib_free_recv_mad(mad_wc);
484 /* will destroy_ah & free_send_mad in send completion */
485 return;
486 }
487
488 ib_free_send_mad(rsp);
489
490err_rsp:
36523159 491 rdma_destroy_ah(ah);
a42d985b
BVA		 492err:
493 ib_free_recv_mad(mad_wc);
494}
495
496/**
497 * srpt_refresh_port() - Configure a HCA port.
498 *
499 * Enable InfiniBand management datagram processing, update the cached sm_lid,
500 * lid and gid values, and register a callback function for processing MADs
501 * on the specified port.
502 *
503 * Note: It is safe to call this function more than once for the same port.
504 */
505static int srpt_refresh_port(struct srpt_port *sport)
506{
507 struct ib_mad_reg_req reg_req;
508 struct ib_port_modify port_modify;
509 struct ib_port_attr port_attr;
2bce1a6d 510 __be16 *guid;
a42d985b
BVA		 511 int ret;
512
9d2aa2b4 513 memset(&port_modify, 0, sizeof(port_modify));
a42d985b
BVA		 514 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
515 port_modify.clr_port_cap_mask = 0;
516
517 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
518 if (ret)
519 goto err_mod_port;
520
521 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
522 if (ret)
523 goto err_query_port;
524
525 sport->sm_lid = port_attr.sm_lid;
526 sport->lid = port_attr.lid;
527
55ee3ab2
MB		 528 ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid,
529 NULL);
a42d985b
BVA		 530 if (ret)
531 goto err_query_port;
532
2bce1a6d
BVA		 533 sport->port_guid_wwn.priv = sport;
534 guid = (__be16 *)&sport->gid.global.interface_id;
716b076b 535 snprintf(sport->port_guid, sizeof(sport->port_guid),
2bce1a6d
BVA		 536 "%04x:%04x:%04x:%04x",
537 be16_to_cpu(guid[0]), be16_to_cpu(guid[1]),
538 be16_to_cpu(guid[2]), be16_to_cpu(guid[3]));
539 sport->port_gid_wwn.priv = sport;
540 snprintf(sport->port_gid, sizeof(sport->port_gid),
541 "0x%016llx%016llx",
542 be64_to_cpu(sport->gid.global.subnet_prefix),
543 be64_to_cpu(sport->gid.global.interface_id));
716b076b 544
a42d985b 545 if (!sport->mad_agent) {
9d2aa2b4 546 memset(&reg_req, 0, sizeof(reg_req));
a42d985b
BVA		 547 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
548 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
549 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
550 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
551
552 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
553 sport->port,
554 IB_QPT_GSI,
555 &reg_req, 0,
556 srpt_mad_send_handler,
557 srpt_mad_recv_handler,
0f29b46d 558 sport, 0);
a42d985b
BVA		 559 if (IS_ERR(sport->mad_agent)) {
560 ret = PTR_ERR(sport->mad_agent);
561 sport->mad_agent = NULL;
562 goto err_query_port;
563 }
564 }
565
566 return 0;
567
568err_query_port:
569
570 port_modify.set_port_cap_mask = 0;
571 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
572 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
573
574err_mod_port:
575
576 return ret;
577}
578
579/**
580 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
581 *
582 * Note: It is safe to call this function more than once for the same device.
583 */
584static void srpt_unregister_mad_agent(struct srpt_device *sdev)
585{
586 struct ib_port_modify port_modify = {
587 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
588 };
589 struct srpt_port *sport;
590 int i;
591
592 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
593 sport = &sdev->port[i - 1];
594 WARN_ON(sport->port != i);
595 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
9f5d32af 596 pr_err("disabling MAD processing failed.\n");
a42d985b
BVA		 597 if (sport->mad_agent) {
598 ib_unregister_mad_agent(sport->mad_agent);
599 sport->mad_agent = NULL;
600 }
601 }
602}
603
604/**
605 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
606 */
607static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
608 int ioctx_size, int dma_size,
609 enum dma_data_direction dir)
610{
611 struct srpt_ioctx *ioctx;
612
613 ioctx = kmalloc(ioctx_size, GFP_KERNEL);
614 if (!ioctx)
615 goto err;
616
617 ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
618 if (!ioctx->buf)
619 goto err_free_ioctx;
620
621 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
622 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
623 goto err_free_buf;
624
625 return ioctx;
626
627err_free_buf:
628 kfree(ioctx->buf);
629err_free_ioctx:
630 kfree(ioctx);
631err:
632 return NULL;
633}
634
635/**
636 * srpt_free_ioctx() - Free an SRPT I/O context structure.
637 */
638static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
639 int dma_size, enum dma_data_direction dir)
640{
641 if (!ioctx)
642 return;
643
644 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
645 kfree(ioctx->buf);
646 kfree(ioctx);
647}
648
649/**
650 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
651 * @sdev: Device to allocate the I/O context ring for.
652 * @ring_size: Number of elements in the I/O context ring.
653 * @ioctx_size: I/O context size.
654 * @dma_size: DMA buffer size.
655 * @dir: DMA data direction.
656 */
657static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
658 int ring_size, int ioctx_size,
659 int dma_size, enum dma_data_direction dir)
660{
661 struct srpt_ioctx **ring;
662 int i;
663
664 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
665 && ioctx_size != sizeof(struct srpt_send_ioctx));
666
667 ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
668 if (!ring)
669 goto out;
670 for (i = 0; i < ring_size; ++i) {
671 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
672 if (!ring[i])
673 goto err;
674 ring[i]->index = i;
675 }
676 goto out;
677
678err:
679 while (--i >= 0)
680 srpt_free_ioctx(sdev, ring[i], dma_size, dir);
681 kfree(ring);
715252d4 682 ring = NULL;
a42d985b
BVA		 683out:
684 return ring;
685}
686
687/**
688 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
689 */
690static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
691 struct srpt_device *sdev, int ring_size,
692 int dma_size, enum dma_data_direction dir)
693{
694 int i;
695
dea26209
BVA		 696 if (!ioctx_ring)
697 return;
698
a42d985b
BVA		 699 for (i = 0; i < ring_size; ++i)
700 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
701 kfree(ioctx_ring);
702}
703
704/**
705 * srpt_get_cmd_state() - Get the state of a SCSI command.
706 */
707static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx)
708{
709 enum srpt_command_state state;
710 unsigned long flags;
711
712 BUG_ON(!ioctx);
713
714 spin_lock_irqsave(&ioctx->spinlock, flags);
715 state = ioctx->state;
716 spin_unlock_irqrestore(&ioctx->spinlock, flags);
717 return state;
718}
719
720/**
721 * srpt_set_cmd_state() - Set the state of a SCSI command.
722 *
723 * Does not modify the state of aborted commands. Returns the previous command
724 * state.
725 */
726static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
727 enum srpt_command_state new)
728{
729 enum srpt_command_state previous;
730 unsigned long flags;
731
732 BUG_ON(!ioctx);
733
734 spin_lock_irqsave(&ioctx->spinlock, flags);
735 previous = ioctx->state;
736 if (previous != SRPT_STATE_DONE)
737 ioctx->state = new;
738 spin_unlock_irqrestore(&ioctx->spinlock, flags);
739
740 return previous;
741}
742
743/**
744 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
745 *
746 * Returns true if and only if the previous command state was equal to 'old'.
747 */
748static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
749 enum srpt_command_state old,
750 enum srpt_command_state new)
751{
752 enum srpt_command_state previous;
753 unsigned long flags;
754
755 WARN_ON(!ioctx);
756 WARN_ON(old == SRPT_STATE_DONE);
757 WARN_ON(new == SRPT_STATE_NEW);
758
759 spin_lock_irqsave(&ioctx->spinlock, flags);
760 previous = ioctx->state;
761 if (previous == old)
762 ioctx->state = new;
763 spin_unlock_irqrestore(&ioctx->spinlock, flags);
764 return previous == old;
765}
766
767/**
768 * srpt_post_recv() - Post an IB receive request.
769 */
dea26209 770static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,
a42d985b
BVA		 771 struct srpt_recv_ioctx *ioctx)
772{
773 struct ib_sge list;
774 struct ib_recv_wr wr, *bad_wr;
775
776 BUG_ON(!sdev);
a42d985b
BVA		 777 list.addr = ioctx->ioctx.dma;
778 list.length = srp_max_req_size;
74333f12 779 list.lkey = sdev->lkey;
a42d985b 780
59fae4de
CH		 781 ioctx->ioctx.cqe.done = srpt_recv_done;
782 wr.wr_cqe = &ioctx->ioctx.cqe;
a42d985b
BVA		 783 wr.next = NULL;
784 wr.sg_list = &list;
785 wr.num_sge = 1;
786
dea26209
BVA		 787 if (sdev->use_srq)
788 return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
789 else
790 return ib_post_recv(ch->qp, &wr, &bad_wr);
a42d985b
BVA		 791}
792
aaf45bd8
BVA		 793/**
794 * srpt_zerolength_write() - Perform a zero-length RDMA write.
795 *
796 * A quote from the InfiniBand specification: C9-88: For an HCA responder
797 * using Reliable Connection service, for each zero-length RDMA READ or WRITE
798 * request, the R_Key shall not be validated, even if the request includes
799 * Immediate data.
800 */
801static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
802{
803 struct ib_send_wr wr, *bad_wr;
804
805 memset(&wr, 0, sizeof(wr));
806 wr.opcode = IB_WR_RDMA_WRITE;
807 wr.wr_cqe = &ch->zw_cqe;
808 wr.send_flags = IB_SEND_SIGNALED;
809 return ib_post_send(ch->qp, &wr, &bad_wr);
810}
811
812static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
813{
814 struct srpt_rdma_ch *ch = cq->cq_context;
815
387add46
BVA		 816 if (wc->status == IB_WC_SUCCESS) {
817 srpt_process_wait_list(ch);
818 } else {
819 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
820 schedule_work(&ch->release_work);
821 else
5658600e 822 WARN_ONCE(1, "%s-%d\n", ch->sess_name, ch->qp->qp_num);
387add46 823 }
aaf45bd8
BVA		 824}
825
b99f8e4d
CH		 826static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
827 struct srp_direct_buf *db, int nbufs, struct scatterlist **sg,
828 unsigned *sg_cnt)
829{
830 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
831 struct srpt_rdma_ch *ch = ioctx->ch;
832 struct scatterlist *prev = NULL;
833 unsigned prev_nents;
834 int ret, i;
835
836 if (nbufs == 1) {
837 ioctx->rw_ctxs = &ioctx->s_rw_ctx;
838 } else {
839 ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs),
840 GFP_KERNEL);
841 if (!ioctx->rw_ctxs)
842 return -ENOMEM;
843 }
844
845 for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) {
846 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
847 u64 remote_addr = be64_to_cpu(db->va);
848 u32 size = be32_to_cpu(db->len);
849 u32 rkey = be32_to_cpu(db->key);
850
851 ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false,
852 i < nbufs - 1);
853 if (ret)
854 goto unwind;
855
856 ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port,
857 ctx->sg, ctx->nents, 0, remote_addr, rkey, dir);
858 if (ret < 0) {
859 target_free_sgl(ctx->sg, ctx->nents);
860 goto unwind;
861 }
862
863 ioctx->n_rdma += ret;
864 ioctx->n_rw_ctx++;
865
866 if (prev) {
867 sg_unmark_end(&prev[prev_nents - 1]);
868 sg_chain(prev, prev_nents + 1, ctx->sg);
869 } else {
870 *sg = ctx->sg;
871 }
872
873 prev = ctx->sg;
874 prev_nents = ctx->nents;
875
876 *sg_cnt += ctx->nents;
877 }
878
879 return 0;
880
881unwind:
882 while (--i >= 0) {
883 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
884
885 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
886 ctx->sg, ctx->nents, dir);
887 target_free_sgl(ctx->sg, ctx->nents);
888 }
889 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
890 kfree(ioctx->rw_ctxs);
891 return ret;
892}
893
894static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch,
895 struct srpt_send_ioctx *ioctx)
896{
897 enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
898 int i;
899
900 for (i = 0; i < ioctx->n_rw_ctx; i++) {
901 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
902
903 rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
904 ctx->sg, ctx->nents, dir);
905 target_free_sgl(ctx->sg, ctx->nents);
906 }
907
908 if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
909 kfree(ioctx->rw_ctxs);
910}
911
912static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
913{
914 /*
915 * The pointer computations below will only be compiled correctly
916 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
917 * whether srp_cmd::add_data has been declared as a byte pointer.
918 */
919 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&
920 !__same_type(srp_cmd->add_data[0], (u8)0));
921
922 /*
923 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
924 * CDB LENGTH' field are reserved and the size in bytes of this field
925 * is four times the value specified in bits 3..7. Hence the "& ~3".
926 */
927 return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3);
928}
929
a42d985b
BVA		 930/**
931 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
932 * @ioctx: Pointer to the I/O context associated with the request.
933 * @srp_cmd: Pointer to the SRP_CMD request data.
934 * @dir: Pointer to the variable to which the transfer direction will be
935 * written.
936 * @data_len: Pointer to the variable to which the total data length of all
937 * descriptors in the SRP_CMD request will be written.
938 *
939 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
940 *
941 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
942 * -ENOMEM when memory allocation fails and zero upon success.
943 */
944static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
b99f8e4d
CH		 945 struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
946 struct scatterlist **sg, unsigned *sg_cnt, u64 *data_len)
a42d985b 947{
a42d985b
BVA		 948 BUG_ON(!dir);
949 BUG_ON(!data_len);
950
a42d985b
BVA		 951 /*
952 * The lower four bits of the buffer format field contain the DATA-IN
953 * buffer descriptor format, and the highest four bits contain the
954 * DATA-OUT buffer descriptor format.
955 */
a42d985b
BVA		 956 if (srp_cmd->buf_fmt & 0xf)
957 /* DATA-IN: transfer data from target to initiator (read). */
958 *dir = DMA_FROM_DEVICE;
959 else if (srp_cmd->buf_fmt >> 4)
960 /* DATA-OUT: transfer data from initiator to target (write). */
961 *dir = DMA_TO_DEVICE;
b99f8e4d
CH		 962 else
963 *dir = DMA_NONE;
964
965 /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
966 ioctx->cmd.data_direction = *dir;
a42d985b 967
a42d985b
BVA		 968 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
969 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
b99f8e4d 970 struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd);
a42d985b 971
a42d985b 972 *data_len = be32_to_cpu(db->len);
b99f8e4d 973 return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt);
a42d985b
BVA		 974 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
975 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
b99f8e4d
CH		 976 struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd);
977 int nbufs = be32_to_cpu(idb->table_desc.len) /
978 sizeof(struct srp_direct_buf);
a42d985b 979
b99f8e4d 980 if (nbufs >
a42d985b 981 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
9f5d32af 982 pr_err("received unsupported SRP_CMD request"
a42d985b
BVA		 983 " type (%u out + %u in != %u / %zu)\n",
984 srp_cmd->data_out_desc_cnt,
985 srp_cmd->data_in_desc_cnt,
986 be32_to_cpu(idb->table_desc.len),
b99f8e4d
CH		 987 sizeof(struct srp_direct_buf));
988 return -EINVAL;
a42d985b
BVA		 989 }
990
a42d985b 991 *data_len = be32_to_cpu(idb->len);
b99f8e4d
CH		 992 return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs,
993 sg, sg_cnt);
994 } else {
995 *data_len = 0;
996 return 0;
a42d985b 997 }
a42d985b
BVA		 998}
999
1000/**
1001 * srpt_init_ch_qp() - Initialize queue pair attributes.
1002 *
1003 * Initialized the attributes of queue pair 'qp' by allowing local write,
1004 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
1005 */
1006static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1007{
1008 struct ib_qp_attr *attr;
1009 int ret;
1010
9d2aa2b4 1011 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
a42d985b
BVA		 1012 if (!attr)
1013 return -ENOMEM;
1014
1015 attr->qp_state = IB_QPS_INIT;
1016 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
1017 IB_ACCESS_REMOTE_WRITE;
1018 attr->port_num = ch->sport->port;
1019 attr->pkey_index = 0;
1020
1021 ret = ib_modify_qp(qp, attr,
1022 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
1023 IB_QP_PKEY_INDEX);
1024
1025 kfree(attr);
1026 return ret;
1027}
1028
1029/**
1030 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
1031 * @ch: channel of the queue pair.
1032 * @qp: queue pair to change the state of.
1033 *
1034 * Returns zero upon success and a negative value upon failure.
1035 *
1036 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1037 * If this structure ever becomes larger, it might be necessary to allocate
1038 * it dynamically instead of on the stack.
1039 */
1040static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1041{
1042 struct ib_qp_attr qp_attr;
1043 int attr_mask;
1044 int ret;
1045
1046 qp_attr.qp_state = IB_QPS_RTR;
1047 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1048 if (ret)
1049 goto out;
1050
1051 qp_attr.max_dest_rd_atomic = 4;
1052
1053 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1054
1055out:
1056 return ret;
1057}
1058
1059/**
1060 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1061 * @ch: channel of the queue pair.
1062 * @qp: queue pair to change the state of.
1063 *
1064 * Returns zero upon success and a negative value upon failure.
1065 *
1066 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1067 * If this structure ever becomes larger, it might be necessary to allocate
1068 * it dynamically instead of on the stack.
1069 */
1070static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1071{
1072 struct ib_qp_attr qp_attr;
1073 int attr_mask;
1074 int ret;
1075
1076 qp_attr.qp_state = IB_QPS_RTS;
1077 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1078 if (ret)
1079 goto out;
1080
1081 qp_attr.max_rd_atomic = 4;
1082
1083 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1084
1085out:
1086 return ret;
1087}
1088
1089/**
1090 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1091 */
1092static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1093{
1094 struct ib_qp_attr qp_attr;
1095
1096 qp_attr.qp_state = IB_QPS_ERR;
1097 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1098}
1099
a42d985b
BVA		 1100/**
1101 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1102 */
1103static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1104{
1105 struct srpt_send_ioctx *ioctx;
3c968887 1106 unsigned long flags;
a42d985b
BVA		 1107
1108 BUG_ON(!ch);
1109
3c968887
BVA		 1110 ioctx = NULL;
1111 spin_lock_irqsave(&ch->spinlock, flags);
1112 if (!list_empty(&ch->free_list)) {
1113 ioctx = list_first_entry(&ch->free_list,
1114 struct srpt_send_ioctx, free_list);
1115 list_del(&ioctx->free_list);
a42d985b 1116 }
3c968887
BVA		 1117 spin_unlock_irqrestore(&ch->spinlock, flags);
1118
1119 if (!ioctx)
1120 return ioctx;
1121
1122 BUG_ON(ioctx->ch != ch);
a42d985b
BVA		 1123 spin_lock_init(&ioctx->spinlock);
1124 ioctx->state = SRPT_STATE_NEW;
3c968887 1125 ioctx->n_rdma = 0;
b99f8e4d 1126 ioctx->n_rw_ctx = 0;
a42d985b 1127 init_completion(&ioctx->tx_done);
3c968887
BVA		 1128 ioctx->queue_status_only = false;
1129 /*
1130 * transport_init_se_cmd() does not initialize all fields, so do it
1131 * here.
1132 */
1133 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1134 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
a42d985b
BVA		 1135
1136 return ioctx;
1137}
1138
a42d985b
BVA		 1139/**
1140 * srpt_abort_cmd() - Abort a SCSI command.
1141 * @ioctx: I/O context associated with the SCSI command.
1142 * @context: Preferred execution context.
1143 */
1144static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1145{
1146 enum srpt_command_state state;
1147 unsigned long flags;
1148
1149 BUG_ON(!ioctx);
1150
1151 /*
1152 * If the command is in a state where the target core is waiting for
49f40163 1153 * the ib_srpt driver, change the state to the next state.
a42d985b
BVA		 1154 */
1155
1156 spin_lock_irqsave(&ioctx->spinlock, flags);
1157 state = ioctx->state;
1158 switch (state) {
1159 case SRPT_STATE_NEED_DATA:
1160 ioctx->state = SRPT_STATE_DATA_IN;
1161 break;
a42d985b
BVA		 1162 case SRPT_STATE_CMD_RSP_SENT:
1163 case SRPT_STATE_MGMT_RSP_SENT:
1164 ioctx->state = SRPT_STATE_DONE;
1165 break;
1166 default:
49f40163
BVA		 1167 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1168 __func__, state);
a42d985b
BVA		 1169 break;
1170 }
1171 spin_unlock_irqrestore(&ioctx->spinlock, flags);
1172
13fdd445
BVA		 1173 pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state,
1174 ioctx->state, ioctx->cmd.tag);
a42d985b
BVA		 1175
1176 switch (state) {
1177 case SRPT_STATE_NEW:
1178 case SRPT_STATE_DATA_IN:
1179 case SRPT_STATE_MGMT:
49f40163 1180 case SRPT_STATE_DONE:
a42d985b
BVA		 1181 /*
1182 * Do nothing - defer abort processing until
1183 * srpt_queue_response() is invoked.
1184 */
a42d985b
BVA		 1185 break;
1186 case SRPT_STATE_NEED_DATA:
49f40163
BVA		 1187 pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);
1188 transport_generic_request_failure(&ioctx->cmd,
1189 TCM_CHECK_CONDITION_ABORT_CMD);
a42d985b
BVA		 1190 break;
1191 case SRPT_STATE_CMD_RSP_SENT:
1192 /*
1193 * SRP_RSP sending failed or the SRP_RSP send completion has
1194 * not been received in time.
1195 */
49f40163 1196 transport_generic_free_cmd(&ioctx->cmd, 0);
a42d985b
BVA		 1197 break;
1198 case SRPT_STATE_MGMT_RSP_SENT:
49f40163 1199 transport_generic_free_cmd(&ioctx->cmd, 0);
a42d985b
BVA		 1200 break;
1201 default:
532ec6f1 1202 WARN(1, "Unexpected command state (%d)", state);
a42d985b
BVA		 1203 break;
1204 }
1205
a42d985b
BVA		 1206 return state;
1207}
1208
1209/**
e672a47f
CH		 1210 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1211 * the data that has been transferred via IB RDMA had to be postponed until the
142ad5db 1212 * check_stop_free() callback. None of this is necessary anymore and needs to
e672a47f 1213 * be cleaned up.
a42d985b 1214 */
59fae4de 1215static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
a42d985b 1216{
59fae4de
CH		 1217 struct srpt_rdma_ch *ch = cq->cq_context;
1218 struct srpt_send_ioctx *ioctx =
19f57298 1219 container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
59fae4de 1220
a42d985b
BVA		 1221 WARN_ON(ioctx->n_rdma <= 0);
1222 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
b99f8e4d 1223 ioctx->n_rdma = 0;
a42d985b 1224
59fae4de
CH		 1225 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1226 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1227 ioctx, wc->status);
1228 srpt_abort_cmd(ioctx);
1229 return;
a42d985b 1230 }
59fae4de
CH		 1231
1232 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1233 SRPT_STATE_DATA_IN))
1234 target_execute_cmd(&ioctx->cmd);
1235 else
1236 pr_err("%s[%d]: wrong state = %d\n", __func__,
1237 __LINE__, srpt_get_cmd_state(ioctx));
a42d985b
BVA		 1238}
1239
a42d985b
BVA		 1240/**
1241 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1242 * @ch: RDMA channel through which the request has been received.
1243 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1244 * be built in the buffer ioctx->buf points at and hence this function will
1245 * overwrite the request data.
1246 * @tag: tag of the request for which this response is being generated.
1247 * @status: value for the STATUS field of the SRP_RSP information unit.
1248 *
1249 * Returns the size in bytes of the SRP_RSP response.
1250 *
1251 * An SRP_RSP response contains a SCSI status or service response. See also
1252 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1253 * response. See also SPC-2 for more information about sense data.
1254 */
1255static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1256 struct srpt_send_ioctx *ioctx, u64 tag,
1257 int status)
1258{
1259 struct srp_rsp *srp_rsp;
1260 const u8 *sense_data;
1261 int sense_data_len, max_sense_len;
1262
1263 /*
1264 * The lowest bit of all SAM-3 status codes is zero (see also
1265 * paragraph 5.3 in SAM-3).
1266 */
1267 WARN_ON(status & 1);
1268
1269 srp_rsp = ioctx->ioctx.buf;
1270 BUG_ON(!srp_rsp);
1271
1272 sense_data = ioctx->sense_data;
1273 sense_data_len = ioctx->cmd.scsi_sense_length;
1274 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1275
9d2aa2b4 1276 memset(srp_rsp, 0, sizeof(*srp_rsp));
a42d985b
BVA		 1277 srp_rsp->opcode = SRP_RSP;
1278 srp_rsp->req_lim_delta =
b356c1c1 1279 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
a42d985b
BVA		 1280 srp_rsp->tag = tag;
1281 srp_rsp->status = status;
1282
1283 if (sense_data_len) {
1284 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1285 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1286 if (sense_data_len > max_sense_len) {
9f5d32af
DL		 1287 pr_warn("truncated sense data from %d to %d"
1288 " bytes\n", sense_data_len, max_sense_len);
a42d985b
BVA		 1289 sense_data_len = max_sense_len;
1290 }
1291
1292 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1293 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1294 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1295 }
1296
1297 return sizeof(*srp_rsp) + sense_data_len;
1298}
1299
1300/**
1301 * srpt_build_tskmgmt_rsp() - Build a task management response.
1302 * @ch: RDMA channel through which the request has been received.
1303 * @ioctx: I/O context in which the SRP_RSP response will be built.
1304 * @rsp_code: RSP_CODE that will be stored in the response.
1305 * @tag: Tag of the request for which this response is being generated.
1306 *
1307 * Returns the size in bytes of the SRP_RSP response.
1308 *
1309 * An SRP_RSP response contains a SCSI status or service response. See also
1310 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1311 * response.
1312 */
1313static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1314 struct srpt_send_ioctx *ioctx,
1315 u8 rsp_code, u64 tag)
1316{
1317 struct srp_rsp *srp_rsp;
1318 int resp_data_len;
1319 int resp_len;
1320
c807f643 1321 resp_data_len = 4;
a42d985b
BVA		 1322 resp_len = sizeof(*srp_rsp) + resp_data_len;
1323
1324 srp_rsp = ioctx->ioctx.buf;
1325 BUG_ON(!srp_rsp);
9d2aa2b4 1326 memset(srp_rsp, 0, sizeof(*srp_rsp));
a42d985b
BVA		 1327
1328 srp_rsp->opcode = SRP_RSP;
b356c1c1
VT		 1329 srp_rsp->req_lim_delta =
1330 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
a42d985b
BVA		 1331 srp_rsp->tag = tag;
1332
c807f643
JW		 1333 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1334 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1335 srp_rsp->data[3] = rsp_code;
a42d985b
BVA		 1336
1337 return resp_len;
1338}
1339
a42d985b
BVA		 1340static int srpt_check_stop_free(struct se_cmd *cmd)
1341{
9474b043
NB		 1342 struct srpt_send_ioctx *ioctx = container_of(cmd,
1343 struct srpt_send_ioctx, cmd);
a42d985b 1344
afc16604 1345 return target_put_sess_cmd(&ioctx->cmd);
a42d985b
BVA		 1346}
1347
1348/**
1349 * srpt_handle_cmd() - Process SRP_CMD.
1350 */
2c7f37ff
BVA		 1351static void srpt_handle_cmd(struct srpt_rdma_ch *ch,
1352 struct srpt_recv_ioctx *recv_ioctx,
1353 struct srpt_send_ioctx *send_ioctx)
a42d985b
BVA		 1354{
1355 struct se_cmd *cmd;
1356 struct srp_cmd *srp_cmd;
b99f8e4d
CH		 1357 struct scatterlist *sg = NULL;
1358 unsigned sg_cnt = 0;
a42d985b
BVA		 1359 u64 data_len;
1360 enum dma_data_direction dir;
9474b043 1361 int rc;
a42d985b
BVA		 1362
1363 BUG_ON(!send_ioctx);
1364
1365 srp_cmd = recv_ioctx->ioctx.buf;
a42d985b 1366 cmd = &send_ioctx->cmd;
649ee054 1367 cmd->tag = srp_cmd->tag;
a42d985b
BVA		 1368
1369 switch (srp_cmd->task_attr) {
1370 case SRP_CMD_SIMPLE_Q:
68d81f40 1371 cmd->sam_task_attr = TCM_SIMPLE_TAG;
a42d985b
BVA		 1372 break;
1373 case SRP_CMD_ORDERED_Q:
1374 default:
68d81f40 1375 cmd->sam_task_attr = TCM_ORDERED_TAG;
a42d985b
BVA		 1376 break;
1377 case SRP_CMD_HEAD_OF_Q:
68d81f40 1378 cmd->sam_task_attr = TCM_HEAD_TAG;
a42d985b
BVA		 1379 break;
1380 case SRP_CMD_ACA:
68d81f40 1381 cmd->sam_task_attr = TCM_ACA_TAG;
a42d985b
BVA		 1382 break;
1383 }
1384
b99f8e4d
CH		 1385 rc = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &sg, &sg_cnt,
1386 &data_len);
1387 if (rc) {
1388 if (rc != -EAGAIN) {
1389 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1390 srp_cmd->tag);
1391 }
2c7f37ff 1392 goto release_ioctx;
a42d985b
BVA		 1393 }
1394
b99f8e4d 1395 rc = target_submit_cmd_map_sgls(cmd, ch->sess, srp_cmd->cdb,
e1dd413c
BVA		 1396 &send_ioctx->sense_data[0],
1397 scsilun_to_int(&srp_cmd->lun), data_len,
b99f8e4d
CH		 1398 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF,
1399 sg, sg_cnt, NULL, 0, NULL, 0);
9474b043 1400 if (rc != 0) {
2c7f37ff
BVA		 1401 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,
1402 srp_cmd->tag);
1403 goto release_ioctx;
187e70a5 1404 }
2c7f37ff 1405 return;
a42d985b 1406
2c7f37ff
BVA		 1407release_ioctx:
1408 send_ioctx->state = SRPT_STATE_DONE;
1409 srpt_release_cmd(cmd);
a42d985b
BVA		 1410}
1411
a42d985b
BVA		 1412static int srp_tmr_to_tcm(int fn)
1413{
1414 switch (fn) {
1415 case SRP_TSK_ABORT_TASK:
1416 return TMR_ABORT_TASK;
1417 case SRP_TSK_ABORT_TASK_SET:
1418 return TMR_ABORT_TASK_SET;
1419 case SRP_TSK_CLEAR_TASK_SET:
1420 return TMR_CLEAR_TASK_SET;
1421 case SRP_TSK_LUN_RESET:
1422 return TMR_LUN_RESET;
1423 case SRP_TSK_CLEAR_ACA:
1424 return TMR_CLEAR_ACA;
1425 default:
1426 return -1;
1427 }
1428}
1429
1430/**
1431 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1432 *
1433 * Returns 0 if and only if the request will be processed by the target core.
1434 *
1435 * For more information about SRP_TSK_MGMT information units, see also section
1436 * 6.7 in the SRP r16a document.
1437 */
1438static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1439 struct srpt_recv_ioctx *recv_ioctx,
1440 struct srpt_send_ioctx *send_ioctx)
1441{
1442 struct srp_tsk_mgmt *srp_tsk;
1443 struct se_cmd *cmd;
3e4f5748 1444 struct se_session *sess = ch->sess;
a42d985b 1445 int tcm_tmr;
3e4f5748 1446 int rc;
a42d985b
BVA		 1447
1448 BUG_ON(!send_ioctx);
1449
1450 srp_tsk = recv_ioctx->ioctx.buf;
1451 cmd = &send_ioctx->cmd;
1452
1453 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1454 " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func,
1455 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
1456
1457 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
649ee054 1458 send_ioctx->cmd.tag = srp_tsk->tag;
a42d985b 1459 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
e1dd413c
BVA		 1460 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,
1461 scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,
1462 GFP_KERNEL, srp_tsk->task_tag,
1463 TARGET_SCF_ACK_KREF);
3e4f5748
NB		 1464 if (rc != 0) {
1465 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
de103c93 1466 goto fail;
a42d985b 1467 }
de103c93
CH		 1468 return;
1469fail:
de103c93 1470 transport_send_check_condition_and_sense(cmd, 0, 0); // XXX:
a42d985b
BVA		 1471}
1472
1473/**
1474 * srpt_handle_new_iu() - Process a newly received information unit.
1475 * @ch: RDMA channel through which the information unit has been received.
1476 * @ioctx: SRPT I/O context associated with the information unit.
1477 */
1478static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
1479 struct srpt_recv_ioctx *recv_ioctx,
1480 struct srpt_send_ioctx *send_ioctx)
1481{
1482 struct srp_cmd *srp_cmd;
a42d985b
BVA		 1483
1484 BUG_ON(!ch);
1485 BUG_ON(!recv_ioctx);
1486
1487 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1488 recv_ioctx->ioctx.dma, srp_max_req_size,
1489 DMA_FROM_DEVICE);
1490
b99f8e4d
CH		 1491 if (unlikely(ch->state == CH_CONNECTING))
1492 goto out_wait;
a42d985b 1493
33912d73 1494 if (unlikely(ch->state != CH_LIVE))
b99f8e4d 1495 return;
a42d985b
BVA		 1496
1497 srp_cmd = recv_ioctx->ioctx.buf;
1498 if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
b99f8e4d
CH		 1499 if (!send_ioctx) {
1500 if (!list_empty(&ch->cmd_wait_list))
1501 goto out_wait;
a42d985b 1502 send_ioctx = srpt_get_send_ioctx(ch);
a42d985b 1503 }
b99f8e4d
CH		 1504 if (unlikely(!send_ioctx))
1505 goto out_wait;
a42d985b
BVA		 1506 }
1507
a42d985b
BVA		 1508 switch (srp_cmd->opcode) {
1509 case SRP_CMD:
1510 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1511 break;
1512 case SRP_TSK_MGMT:
1513 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1514 break;
1515 case SRP_I_LOGOUT:
9f5d32af 1516 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
a42d985b
BVA		 1517 break;
1518 case SRP_CRED_RSP:
1519 pr_debug("received SRP_CRED_RSP\n");
1520 break;
1521 case SRP_AER_RSP:
1522 pr_debug("received SRP_AER_RSP\n");
1523 break;
1524 case SRP_RSP:
9f5d32af 1525 pr_err("Received SRP_RSP\n");
a42d985b
BVA		 1526 break;
1527 default:
9f5d32af 1528 pr_err("received IU with unknown opcode 0x%x\n",
a42d985b
BVA		 1529 srp_cmd->opcode);
1530 break;
1531 }
1532
dea26209 1533 srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);
a42d985b 1534 return;
b99f8e4d
CH		 1535
1536out_wait:
1537 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
a42d985b
BVA		 1538}
1539
59fae4de 1540static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
a42d985b 1541{
59fae4de
CH		 1542 struct srpt_rdma_ch *ch = cq->cq_context;
1543 struct srpt_recv_ioctx *ioctx =
1544 container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
a42d985b 1545
a42d985b
BVA		 1546 if (wc->status == IB_WC_SUCCESS) {
1547 int req_lim;
1548
1549 req_lim = atomic_dec_return(&ch->req_lim);
1550 if (unlikely(req_lim < 0))
9f5d32af 1551 pr_err("req_lim = %d < 0\n", req_lim);
a42d985b
BVA		 1552 srpt_handle_new_iu(ch, ioctx, NULL);
1553 } else {
59fae4de
CH		 1554 pr_info("receiving failed for ioctx %p with status %d\n",
1555 ioctx, wc->status);
a42d985b
BVA		 1556 }
1557}
1558
539b3248
BVA		 1559/*
1560 * This function must be called from the context in which RDMA completions are
1561 * processed because it accesses the wait list without protection against
1562 * access from other threads.
1563 */
1564static void srpt_process_wait_list(struct srpt_rdma_ch *ch)
1565{
1566 struct srpt_send_ioctx *ioctx;
1567
1568 while (!list_empty(&ch->cmd_wait_list) &&
1569 ch->state >= CH_LIVE &&
1570 (ioctx = srpt_get_send_ioctx(ch)) != NULL) {
1571 struct srpt_recv_ioctx *recv_ioctx;
1572
1573 recv_ioctx = list_first_entry(&ch->cmd_wait_list,
1574 struct srpt_recv_ioctx,
1575 wait_list);
1576 list_del(&recv_ioctx->wait_list);
1577 srpt_handle_new_iu(ch, recv_ioctx, ioctx);
1578 }
1579}
1580
a42d985b 1581/**
a42d985b
BVA		 1582 * Note: Although this has not yet been observed during tests, at least in
1583 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1584 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1585 * value in each response is set to one, and it is possible that this response
1586 * makes the initiator send a new request before the send completion for that
1587 * response has been processed. This could e.g. happen if the call to
1588 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1589 * if IB retransmission causes generation of the send completion to be
1590 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1591 * are queued on cmd_wait_list. The code below processes these delayed
1592 * requests one at a time.
1593 */
59fae4de 1594static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
a42d985b 1595{
59fae4de
CH		 1596 struct srpt_rdma_ch *ch = cq->cq_context;
1597 struct srpt_send_ioctx *ioctx =
1598 container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
1599 enum srpt_command_state state;
a42d985b 1600
59fae4de
CH		 1601 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1602
1603 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
1604 state != SRPT_STATE_MGMT_RSP_SENT);
1605
b99f8e4d 1606 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
59fae4de 1607
49f40163 1608 if (wc->status != IB_WC_SUCCESS)
59fae4de
CH		 1609 pr_info("sending response for ioctx 0x%p failed"
1610 " with status %d\n", ioctx, wc->status);
1611
59fae4de 1612 if (state != SRPT_STATE_DONE) {
59fae4de 1613 transport_generic_free_cmd(&ioctx->cmd, 0);
a42d985b 1614 } else {
59fae4de
CH		 1615 pr_err("IB completion has been received too late for"
1616 " wr_id = %u.\n", ioctx->ioctx.index);
a42d985b
BVA		 1617 }
1618
539b3248 1619 srpt_process_wait_list(ch);
a42d985b
BVA		 1620}
1621
a42d985b
BVA		 1622/**
1623 * srpt_create_ch_ib() - Create receive and send completion queues.
1624 */
1625static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
1626{
1627 struct ib_qp_init_attr *qp_init;
1628 struct srpt_port *sport = ch->sport;
1629 struct srpt_device *sdev = sport->sdev;
30c6d877 1630 const struct ib_device_attr *attrs = &sdev->device->attrs;
a42d985b 1631 u32 srp_sq_size = sport->port_attrib.srp_sq_size;
dea26209 1632 int i, ret;
a42d985b
BVA		 1633
1634 WARN_ON(ch->rq_size < 1);
1635
1636 ret = -ENOMEM;
9d2aa2b4 1637 qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);
a42d985b
BVA		 1638 if (!qp_init)
1639 goto out;
1640
ab477c1f 1641retry:
59fae4de
CH		 1642 ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + srp_sq_size,
1643 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE);
a42d985b
BVA		 1644 if (IS_ERR(ch->cq)) {
1645 ret = PTR_ERR(ch->cq);
9f5d32af 1646 pr_err("failed to create CQ cqe= %d ret= %d\n",
a42d985b
BVA		 1647 ch->rq_size + srp_sq_size, ret);
1648 goto out;
1649 }
1650
1651 qp_init->qp_context = (void *)ch;
1652 qp_init->event_handler
1653 = (void(*)(struct ib_event *, void*))srpt_qp_event;
1654 qp_init->send_cq = ch->cq;
1655 qp_init->recv_cq = ch->cq;
a42d985b
BVA		 1656 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
1657 qp_init->qp_type = IB_QPT_RC;
b99f8e4d
CH		 1658 /*
1659 * We divide up our send queue size into half SEND WRs to send the
1660 * completions, and half R/W contexts to actually do the RDMA
1661 * READ/WRITE transfers. Note that we need to allocate CQ slots for
1662 * both both, as RDMA contexts will also post completions for the
1663 * RDMA READ case.
1664 */
7a01d05c 1665 qp_init->cap.max_send_wr = min(srp_sq_size / 2, attrs->max_qp_wr + 0U);
b99f8e4d 1666 qp_init->cap.max_rdma_ctxs = srp_sq_size / 2;
30c6d877 1667 qp_init->cap.max_send_sge = min(attrs->max_sge, SRPT_MAX_SG_PER_WQE);
b99f8e4d 1668 qp_init->port_num = ch->sport->port;
dea26209
BVA		 1669 if (sdev->use_srq) {
1670 qp_init->srq = sdev->srq;
1671 } else {
1672 qp_init->cap.max_recv_wr = ch->rq_size;
1673 qp_init->cap.max_recv_sge = qp_init->cap.max_send_sge;
1674 }
a42d985b
BVA		 1675
1676 ch->qp = ib_create_qp(sdev->pd, qp_init);
1677 if (IS_ERR(ch->qp)) {
1678 ret = PTR_ERR(ch->qp);
ab477c1f
BVA		 1679 if (ret == -ENOMEM) {
1680 srp_sq_size /= 2;
1681 if (srp_sq_size >= MIN_SRPT_SQ_SIZE) {
1682 ib_destroy_cq(ch->cq);
1683 goto retry;
1684 }
1685 }
9f5d32af 1686 pr_err("failed to create_qp ret= %d\n", ret);
a42d985b
BVA		 1687 goto err_destroy_cq;
1688 }
1689
1690 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
1691
1692 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1693 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
1694 qp_init->cap.max_send_wr, ch->cm_id);
1695
1696 ret = srpt_init_ch_qp(ch, ch->qp);
1697 if (ret)
1698 goto err_destroy_qp;
1699
321e329b
MM		 1700 if (!sdev->use_srq)
1701 for (i = 0; i < ch->rq_size; i++)
1702 srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]);
1703
a42d985b
BVA		 1704out:
1705 kfree(qp_init);
1706 return ret;
1707
1708err_destroy_qp:
1709 ib_destroy_qp(ch->qp);
1710err_destroy_cq:
59fae4de 1711 ib_free_cq(ch->cq);
a42d985b
BVA		 1712 goto out;
1713}
1714
1715static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
1716{
a42d985b 1717 ib_destroy_qp(ch->qp);
59fae4de 1718 ib_free_cq(ch->cq);
a42d985b
BVA		 1719}
1720
1721/**
aaf45bd8 1722 * srpt_close_ch() - Close an RDMA channel.
a42d985b 1723 *
aaf45bd8
BVA		 1724 * Make sure all resources associated with the channel will be deallocated at
1725 * an appropriate time.
a42d985b 1726 *
aaf45bd8
BVA		 1727 * Returns true if and only if the channel state has been modified into
1728 * CH_DRAINING.
a42d985b 1729 */
aaf45bd8 1730static bool srpt_close_ch(struct srpt_rdma_ch *ch)
a42d985b 1731{
aaf45bd8 1732 int ret;
a42d985b 1733
aaf45bd8
BVA		 1734 if (!srpt_set_ch_state(ch, CH_DRAINING)) {
1735 pr_debug("%s-%d: already closed\n", ch->sess_name,
1736 ch->qp->qp_num);
1737 return false;
a42d985b 1738 }
a42d985b 1739
aaf45bd8 1740 kref_get(&ch->kref);
a42d985b 1741
aaf45bd8
BVA		 1742 ret = srpt_ch_qp_err(ch);
1743 if (ret < 0)
1744 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1745 ch->sess_name, ch->qp->qp_num, ret);
a42d985b 1746
aaf45bd8
BVA		 1747 pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
1748 ch->qp->qp_num);
1749 ret = srpt_zerolength_write(ch);
1750 if (ret < 0) {
1751 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1752 ch->sess_name, ch->qp->qp_num, ret);
1753 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
1754 schedule_work(&ch->release_work);
1755 else
1756 WARN_ON_ONCE(true);
1757 }
a42d985b 1758
aaf45bd8
BVA		 1759 kref_put(&ch->kref, srpt_free_ch);
1760
1761 return true;
1d19f780
NB		 1762}
1763
aaf45bd8
BVA		 1764/*
1765 * Change the channel state into CH_DISCONNECTING. If a channel has not yet
1766 * reached the connected state, close it. If a channel is in the connected
1767 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
1768 * the responsibility of the caller to ensure that this function is not
1769 * invoked concurrently with the code that accepts a connection. This means
1770 * that this function must either be invoked from inside a CM callback
1771 * function or that it must be invoked with the srpt_port.mutex held.
a42d985b 1772 */
aaf45bd8 1773static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
a42d985b 1774{
a42d985b 1775 int ret;
a42d985b 1776
aaf45bd8
BVA		 1777 if (!srpt_set_ch_state(ch, CH_DISCONNECTING))
1778 return -ENOTCONN;
a42d985b 1779
aaf45bd8
BVA		 1780 ret = ib_send_cm_dreq(ch->cm_id, NULL, 0);
1781 if (ret < 0)
1782 ret = ib_send_cm_drep(ch->cm_id, NULL, 0);
a42d985b 1783
aaf45bd8
BVA		 1784 if (ret < 0 && srpt_close_ch(ch))
1785 ret = 0;
1d19f780 1786
aaf45bd8
BVA		 1787 return ret;
1788}
1789
01b3ee13
BVA		 1790/*
1791 * Send DREQ and wait for DREP. Return true if and only if this function
1792 * changed the state of @ch.
1793 */
1794static bool srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)
1795 __must_hold(&sdev->mutex)
1796{
1797 DECLARE_COMPLETION_ONSTACK(release_done);
1798 struct srpt_device *sdev = ch->sport->sdev;
1799 bool wait;
1800
1801 lockdep_assert_held(&sdev->mutex);
1802
1803 pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
1804 ch->state);
1805
1806 WARN_ON(ch->release_done);
1807 ch->release_done = &release_done;
1808 wait = !list_empty(&ch->list);
1809 srpt_disconnect_ch(ch);
1810 mutex_unlock(&sdev->mutex);
1811
1812 if (!wait)
1813 goto out;
1814
1815 while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0)
1816 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
1817 ch->sess_name, ch->qp->qp_num, ch->state);
1818
1819out:
1820 mutex_lock(&sdev->mutex);
1821 return wait;
1822}
1823
aaf45bd8
BVA		 1824static void __srpt_close_all_ch(struct srpt_device *sdev)
1825{
1826 struct srpt_rdma_ch *ch;
1827
1828 lockdep_assert_held(&sdev->mutex);
1829
1830 list_for_each_entry(ch, &sdev->rch_list, list) {
1831 if (srpt_disconnect_ch(ch) >= 0)
1832 pr_info("Closing channel %s-%d because target %s has been disabled\n",
1833 ch->sess_name, ch->qp->qp_num,
1834 sdev->device->name);
1835 srpt_close_ch(ch);
a42d985b
BVA		 1836 }
1837}
1838
aaf45bd8
BVA		 1839static void srpt_free_ch(struct kref *kref)
1840{
1841 struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);
1842
1843 kfree(ch);
a42d985b
BVA		 1844}
1845
1846static void srpt_release_channel_work(struct work_struct *w)
1847{
1848 struct srpt_rdma_ch *ch;
1849 struct srpt_device *sdev;
9474b043 1850 struct se_session *se_sess;
a42d985b
BVA		 1851
1852 ch = container_of(w, struct srpt_rdma_ch, release_work);
f108f0f6
BVA		 1853 pr_debug("%s: %s-%d; release_done = %p\n", __func__, ch->sess_name,
1854 ch->qp->qp_num, ch->release_done);
a42d985b
BVA		 1855
1856 sdev = ch->sport->sdev;
1857 BUG_ON(!sdev);
1858
9474b043
NB		 1859 se_sess = ch->sess;
1860 BUG_ON(!se_sess);
1861
88936259 1862 target_sess_cmd_list_set_waiting(se_sess);
be646c2d 1863 target_wait_for_sess_cmds(se_sess);
9474b043
NB		 1864
1865 transport_deregister_session_configfs(se_sess);
1866 transport_deregister_session(se_sess);
a42d985b
BVA		 1867 ch->sess = NULL;
1868
0b41d6ca
NB		 1869 ib_destroy_cm_id(ch->cm_id);
1870
a42d985b
BVA		 1871 srpt_destroy_ch_ib(ch);
1872
1873 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
1874 ch->sport->sdev, ch->rq_size,
1875 ch->rsp_size, DMA_TO_DEVICE);
1876
dea26209
BVA		 1877 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
1878 sdev, ch->rq_size,
1879 srp_max_req_size, DMA_FROM_DEVICE);
1880
8628991f 1881 mutex_lock(&sdev->mutex);
f108f0f6 1882 list_del_init(&ch->list);
a42d985b
BVA		 1883 if (ch->release_done)
1884 complete(ch->release_done);
8628991f 1885 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 1886
1887 wake_up(&sdev->ch_releaseQ);
1888
aaf45bd8 1889 kref_put(&ch->kref, srpt_free_ch);
a42d985b
BVA		 1890}
1891
a42d985b
BVA		 1892/**
1893 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
1894 *
1895 * Ownership of the cm_id is transferred to the target session if this
1896 * functions returns zero. Otherwise the caller remains the owner of cm_id.
1897 */
1898static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
1899 struct ib_cm_req_event_param *param,
1900 void *private_data)
1901{
1902 struct srpt_device *sdev = cm_id->context;
1903 struct srpt_port *sport = &sdev->port[param->port - 1];
1904 struct srp_login_req *req;
1905 struct srp_login_rsp *rsp;
1906 struct srp_login_rej *rej;
1907 struct ib_cm_rep_param *rep_param;
1908 struct srpt_rdma_ch *ch, *tmp_ch;
2bce1a6d 1909 __be16 *guid;
a42d985b 1910 u32 it_iu_len;
3c968887 1911 int i, ret = 0;
a42d985b
BVA		 1912
1913 WARN_ON_ONCE(irqs_disabled());
1914
1915 if (WARN_ON(!sdev || !private_data))
1916 return -EINVAL;
1917
1918 req = (struct srp_login_req *)private_data;
1919
1920 it_iu_len = be32_to_cpu(req->req_it_iu_len);
1921
9f5d32af
DL		 1922 pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
1923 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
1924 " (guid=0x%llx:0x%llx)\n",
1925 be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
1926 be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
1927 be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
1928 be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
1929 it_iu_len,
1930 param->port,
1931 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
1932 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
a42d985b 1933
9d2aa2b4
BVA		 1934 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
1935 rej = kzalloc(sizeof(*rej), GFP_KERNEL);
1936 rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);
a42d985b
BVA		 1937
1938 if (!rsp || !rej || !rep_param) {
1939 ret = -ENOMEM;
1940 goto out;
1941 }
1942
1943 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
b356c1c1
VT		 1944 rej->reason = cpu_to_be32(
1945 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
a42d985b 1946 ret = -EINVAL;
9f5d32af 1947 pr_err("rejected SRP_LOGIN_REQ because its"
a42d985b
BVA		 1948 " length (%d bytes) is out of range (%d .. %d)\n",
1949 it_iu_len, 64, srp_max_req_size);
1950 goto reject;
1951 }
1952
1953 if (!sport->enabled) {
b356c1c1
VT		 1954 rej->reason = cpu_to_be32(
1955 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
a42d985b 1956 ret = -EINVAL;
9f5d32af 1957 pr_err("rejected SRP_LOGIN_REQ because the target port"
a42d985b
BVA		 1958 " has not yet been enabled\n");
1959 goto reject;
1960 }
1961
1962 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
1963 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
1964
8628991f 1965 mutex_lock(&sdev->mutex);
a42d985b
BVA		 1966
1967 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
1968 if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
1969 && !memcmp(ch->t_port_id, req->target_port_id, 16)
1970 && param->port == ch->sport->port
1971 && param->listen_id == ch->sport->sdev->cm_id
1972 && ch->cm_id) {
aaf45bd8 1973 if (srpt_disconnect_ch(ch) < 0)
a42d985b 1974 continue;
aaf45bd8
BVA		 1975 pr_info("Relogin - closed existing channel %s\n",
1976 ch->sess_name);
a42d985b
BVA		 1977 rsp->rsp_flags =
1978 SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
1979 }
1980 }
1981
8628991f 1982 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 1983
1984 } else
1985 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
1986
1987 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
1988 || *(__be64 *)(req->target_port_id + 8) !=
1989 cpu_to_be64(srpt_service_guid)) {
b356c1c1
VT		 1990 rej->reason = cpu_to_be32(
1991 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
a42d985b 1992 ret = -ENOMEM;
9f5d32af 1993 pr_err("rejected SRP_LOGIN_REQ because it"
a42d985b
BVA		 1994 " has an invalid target port identifier.\n");
1995 goto reject;
1996 }
1997
9d2aa2b4 1998 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
a42d985b 1999 if (!ch) {
b356c1c1
VT		 2000 rej->reason = cpu_to_be32(
2001 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
9f5d32af 2002 pr_err("rejected SRP_LOGIN_REQ because no memory.\n");
a42d985b
BVA		 2003 ret = -ENOMEM;
2004 goto reject;
2005 }
2006
aaf45bd8
BVA		 2007 kref_init(&ch->kref);
2008 ch->zw_cqe.done = srpt_zerolength_write_done;
a42d985b
BVA		 2009 INIT_WORK(&ch->release_work, srpt_release_channel_work);
2010 memcpy(ch->i_port_id, req->initiator_port_id, 16);
2011 memcpy(ch->t_port_id, req->target_port_id, 16);
2012 ch->sport = &sdev->port[param->port - 1];
2013 ch->cm_id = cm_id;
2739b592 2014 cm_id->context = ch;
a42d985b 2015 /*
7a01d05c
BVA		 2016 * ch->rq_size should be at least as large as the initiator queue
2017 * depth to avoid that the initiator driver has to report QUEUE_FULL
2018 * to the SCSI mid-layer.
a42d985b 2019 */
7a01d05c 2020 ch->rq_size = min(SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr);
a42d985b
BVA		 2021 spin_lock_init(&ch->spinlock);
2022 ch->state = CH_CONNECTING;
2023 INIT_LIST_HEAD(&ch->cmd_wait_list);
2024 ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
2025
2026 ch->ioctx_ring = (struct srpt_send_ioctx **)
2027 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2028 sizeof(*ch->ioctx_ring[0]),
2029 ch->rsp_size, DMA_TO_DEVICE);
2030 if (!ch->ioctx_ring)
2031 goto free_ch;
2032
3c968887
BVA		 2033 INIT_LIST_HEAD(&ch->free_list);
2034 for (i = 0; i < ch->rq_size; i++) {
2035 ch->ioctx_ring[i]->ch = ch;
2036 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
2037 }
dea26209
BVA		 2038 if (!sdev->use_srq) {
2039 ch->ioctx_recv_ring = (struct srpt_recv_ioctx **)
2040 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2041 sizeof(*ch->ioctx_recv_ring[0]),
2042 srp_max_req_size,
2043 DMA_FROM_DEVICE);
2044 if (!ch->ioctx_recv_ring) {
2045 pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n");
2046 rej->reason =
2047 cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2048 goto free_ring;
2049 }
2050 }
3c968887 2051
a42d985b
BVA		 2052 ret = srpt_create_ch_ib(ch);
2053 if (ret) {
b356c1c1
VT		 2054 rej->reason = cpu_to_be32(
2055 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
9f5d32af 2056 pr_err("rejected SRP_LOGIN_REQ because creating"
a42d985b 2057 " a new RDMA channel failed.\n");
dea26209 2058 goto free_recv_ring;
a42d985b
BVA		 2059 }
2060
2061 ret = srpt_ch_qp_rtr(ch, ch->qp);
2062 if (ret) {
b356c1c1 2063 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
9f5d32af 2064 pr_err("rejected SRP_LOGIN_REQ because enabling"
a42d985b
BVA		 2065 " RTR failed (error code = %d)\n", ret);
2066 goto destroy_ib;
2067 }
f246c941 2068
2bce1a6d
BVA		 2069 guid = (__be16 *)&param->primary_path->sgid.global.interface_id;
2070 snprintf(ch->ini_guid, sizeof(ch->ini_guid), "%04x:%04x:%04x:%04x",
2071 be16_to_cpu(guid[0]), be16_to_cpu(guid[1]),
2072 be16_to_cpu(guid[2]), be16_to_cpu(guid[3]));
a42d985b
BVA		 2073 snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx",
2074 be64_to_cpu(*(__be64 *)ch->i_port_id),
2075 be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
2076
2077 pr_debug("registering session %s\n", ch->sess_name);
2078
2bce1a6d
BVA		 2079 if (sport->port_guid_tpg.se_tpg_wwn)
2080 ch->sess = target_alloc_session(&sport->port_guid_tpg, 0, 0,
2081 TARGET_PROT_NORMAL,
2082 ch->ini_guid, ch, NULL);
2083 if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess))
2084 ch->sess = target_alloc_session(&sport->port_gid_tpg, 0, 0,
0d38c240
BVA		 2085 TARGET_PROT_NORMAL, ch->sess_name, ch,
2086 NULL);
2087 /* Retry without leading "0x" */
2bce1a6d
BVA		 2088 if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess))
2089 ch->sess = target_alloc_session(&sport->port_gid_tpg, 0, 0,
0d38c240
BVA		 2090 TARGET_PROT_NORMAL,
2091 ch->sess_name + 2, ch, NULL);
2bce1a6d 2092 if (IS_ERR_OR_NULL(ch->sess)) {
0d38c240
BVA		 2093 pr_info("Rejected login because no ACL has been configured yet for initiator %s.\n",
2094 ch->sess_name);
b42057ab
NB		 2095 rej->reason = cpu_to_be32((PTR_ERR(ch->sess) == -ENOMEM) ?
2096 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES :
f246c941 2097 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
f246c941 2098 goto destroy_ib;
a42d985b 2099 }
a42d985b
BVA		 2100
2101 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess,
2102 ch->sess_name, ch->cm_id);
2103
2104 /* create srp_login_response */
2105 rsp->opcode = SRP_LOGIN_RSP;
2106 rsp->tag = req->tag;
2107 rsp->max_it_iu_len = req->req_it_iu_len;
2108 rsp->max_ti_iu_len = req->req_it_iu_len;
2109 ch->max_ti_iu_len = it_iu_len;
b356c1c1
VT		 2110 rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2111 | SRP_BUF_FORMAT_INDIRECT);
a42d985b
BVA		 2112 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2113 atomic_set(&ch->req_lim, ch->rq_size);
2114 atomic_set(&ch->req_lim_delta, 0);
2115
2116 /* create cm reply */
2117 rep_param->qp_num = ch->qp->qp_num;
2118 rep_param->private_data = (void *)rsp;
9d2aa2b4 2119 rep_param->private_data_len = sizeof(*rsp);
a42d985b
BVA		 2120 rep_param->rnr_retry_count = 7;
2121 rep_param->flow_control = 1;
2122 rep_param->failover_accepted = 0;
2123 rep_param->srq = 1;
2124 rep_param->responder_resources = 4;
2125 rep_param->initiator_depth = 4;
2126
2127 ret = ib_send_cm_rep(cm_id, rep_param);
2128 if (ret) {
9f5d32af 2129 pr_err("sending SRP_LOGIN_REQ response failed"
a42d985b
BVA		 2130 " (error code = %d)\n", ret);
2131 goto release_channel;
2132 }
2133
8628991f 2134 mutex_lock(&sdev->mutex);
a42d985b 2135 list_add_tail(&ch->list, &sdev->rch_list);
8628991f 2136 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 2137
2138 goto out;
2139
2140release_channel:
aaf45bd8 2141 srpt_disconnect_ch(ch);
a42d985b 2142 transport_deregister_session_configfs(ch->sess);
a42d985b
BVA		 2143 transport_deregister_session(ch->sess);
2144 ch->sess = NULL;
2145
2146destroy_ib:
2147 srpt_destroy_ch_ib(ch);
2148
dea26209
BVA		 2149free_recv_ring:
2150 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
2151 ch->sport->sdev, ch->rq_size,
2152 srp_max_req_size, DMA_FROM_DEVICE);
2153
a42d985b
BVA		 2154free_ring:
2155 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2156 ch->sport->sdev, ch->rq_size,
2157 ch->rsp_size, DMA_TO_DEVICE);
2158free_ch:
2159 kfree(ch);
2160
2161reject:
2162 rej->opcode = SRP_LOGIN_REJ;
2163 rej->tag = req->tag;
b356c1c1
VT		 2164 rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2165 | SRP_BUF_FORMAT_INDIRECT);
a42d985b
BVA		 2166
2167 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
9d2aa2b4 2168 (void *)rej, sizeof(*rej));
a42d985b
BVA		 2169
2170out:
2171 kfree(rep_param);
2172 kfree(rsp);
2173 kfree(rej);
2174
2175 return ret;
2176}
2177
2739b592
BVA		 2178static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,
2179 enum ib_cm_rej_reason reason,
2180 const u8 *private_data,
2181 u8 private_data_len)
a42d985b 2182{
c13c90ea
BVA		 2183 char *priv = NULL;
2184 int i;
2185
2186 if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,
2187 GFP_KERNEL))) {
2188 for (i = 0; i < private_data_len; i++)
2189 sprintf(priv + 3 * i, " %02x", private_data[i]);
2190 }
2191 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2192 ch->sess_name, ch->qp->qp_num, reason, private_data_len ?
2193 "; private data" : "", priv ? priv : " (?)");
2194 kfree(priv);
a42d985b
BVA		 2195}
2196
2197/**
2198 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2199 *
2200 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2201 * and that the recipient may begin transmitting (RTU = ready to use).
2202 */
2739b592 2203static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
a42d985b 2204{
a42d985b
BVA		 2205 int ret;
2206
f130c220 2207 if (srpt_set_ch_state(ch, CH_LIVE)) {
a42d985b
BVA		 2208 ret = srpt_ch_qp_rts(ch, ch->qp);
2209
387add46
BVA		 2210 if (ret == 0) {
2211 /* Trigger wait list processing. */
2212 ret = srpt_zerolength_write(ch);
2213 WARN_ONCE(ret < 0, "%d\n", ret);
2214 } else {
a42d985b 2215 srpt_close_ch(ch);
387add46 2216 }
a42d985b
BVA		 2217 }
2218}
2219
a42d985b
BVA		 2220/**
2221 * srpt_cm_handler() - IB connection manager callback function.
2222 *
2223 * A non-zero return value will cause the caller destroy the CM ID.
2224 *
2225 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2226 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2227 * a non-zero value in any other case will trigger a race with the
2228 * ib_destroy_cm_id() call in srpt_release_channel().
2229 */
2230static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2231{
2739b592 2232 struct srpt_rdma_ch *ch = cm_id->context;
a42d985b
BVA		 2233 int ret;
2234
2235 ret = 0;
2236 switch (event->event) {
2237 case IB_CM_REQ_RECEIVED:
2238 ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
2239 event->private_data);
2240 break;
2241 case IB_CM_REJ_RECEIVED:
2739b592
BVA		 2242 srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,
2243 event->private_data,
2244 IB_CM_REJ_PRIVATE_DATA_SIZE);
a42d985b
BVA		 2245 break;
2246 case IB_CM_RTU_RECEIVED:
2247 case IB_CM_USER_ESTABLISHED:
2739b592 2248 srpt_cm_rtu_recv(ch);
a42d985b
BVA		 2249 break;
2250 case IB_CM_DREQ_RECEIVED:
aaf45bd8 2251 srpt_disconnect_ch(ch);
a42d985b
BVA		 2252 break;
2253 case IB_CM_DREP_RECEIVED:
2739b592
BVA		 2254 pr_info("Received CM DREP message for ch %s-%d.\n",
2255 ch->sess_name, ch->qp->qp_num);
aaf45bd8 2256 srpt_close_ch(ch);
a42d985b
BVA		 2257 break;
2258 case IB_CM_TIMEWAIT_EXIT:
2739b592
BVA		 2259 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2260 ch->sess_name, ch->qp->qp_num);
aaf45bd8 2261 srpt_close_ch(ch);
a42d985b
BVA		 2262 break;
2263 case IB_CM_REP_ERROR:
2739b592
BVA		 2264 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
2265 ch->qp->qp_num);
a42d985b
BVA		 2266 break;
2267 case IB_CM_DREQ_ERROR:
1e20a2a5 2268 pr_info("Received CM DREQ ERROR event.\n");
a42d985b
BVA		 2269 break;
2270 case IB_CM_MRA_RECEIVED:
1e20a2a5 2271 pr_info("Received CM MRA event\n");
a42d985b
BVA		 2272 break;
2273 default:
1e20a2a5 2274 pr_err("received unrecognized CM event %d\n", event->event);
a42d985b
BVA		 2275 break;
2276 }
2277
2278 return ret;
2279}
2280
a42d985b
BVA		 2281static int srpt_write_pending_status(struct se_cmd *se_cmd)
2282{
2283 struct srpt_send_ioctx *ioctx;
2284
2285 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2286 return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA;
2287}
2288
2289/*
2290 * srpt_write_pending() - Start data transfer from initiator to target (write).
2291 */
2292static int srpt_write_pending(struct se_cmd *se_cmd)
2293{
fc3af58d
BVA		 2294 struct srpt_send_ioctx *ioctx =
2295 container_of(se_cmd, struct srpt_send_ioctx, cmd);
2296 struct srpt_rdma_ch *ch = ioctx->ch;
b99f8e4d
CH		 2297 struct ib_send_wr *first_wr = NULL, *bad_wr;
2298 struct ib_cqe *cqe = &ioctx->rdma_cqe;
a42d985b 2299 enum srpt_command_state new_state;
b99f8e4d 2300 int ret, i;
a42d985b
BVA		 2301
2302 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2303 WARN_ON(new_state == SRPT_STATE_DONE);
b99f8e4d
CH		 2304
2305 if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) {
2306 pr_warn("%s: IB send queue full (needed %d)\n",
2307 __func__, ioctx->n_rdma);
2308 ret = -ENOMEM;
2309 goto out_undo;
2310 }
2311
2312 cqe->done = srpt_rdma_read_done;
2313 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2314 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2315
2316 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port,
2317 cqe, first_wr);
2318 cqe = NULL;
2319 }
dcc9881e 2320
b99f8e4d
CH		 2321 ret = ib_post_send(ch->qp, first_wr, &bad_wr);
2322 if (ret) {
2323 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
2324 __func__, ret, ioctx->n_rdma,
2325 atomic_read(&ch->sq_wr_avail));
2326 goto out_undo;
2327 }
2328
2329 return 0;
2330out_undo:
2331 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
2332 return ret;
a42d985b
BVA		 2333}
2334
2335static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2336{
2337 switch (tcm_mgmt_status) {
2338 case TMR_FUNCTION_COMPLETE:
2339 return SRP_TSK_MGMT_SUCCESS;
2340 case TMR_FUNCTION_REJECTED:
2341 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
2342 }
2343 return SRP_TSK_MGMT_FAILED;
2344}
2345
2346/**
2347 * srpt_queue_response() - Transmits the response to a SCSI command.
2348 *
2349 * Callback function called by the TCM core. Must not block since it can be
2350 * invoked on the context of the IB completion handler.
2351 */
b79fafac 2352static void srpt_queue_response(struct se_cmd *cmd)
a42d985b 2353{
b99f8e4d
CH		 2354 struct srpt_send_ioctx *ioctx =
2355 container_of(cmd, struct srpt_send_ioctx, cmd);
2356 struct srpt_rdma_ch *ch = ioctx->ch;
2357 struct srpt_device *sdev = ch->sport->sdev;
10fce586 2358 struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr;
b99f8e4d 2359 struct ib_sge sge;
a42d985b
BVA		 2360 enum srpt_command_state state;
2361 unsigned long flags;
b99f8e4d 2362 int resp_len, ret, i;
a42d985b
BVA		 2363 u8 srp_tm_status;
2364
a42d985b
BVA		 2365 BUG_ON(!ch);
2366
2367 spin_lock_irqsave(&ioctx->spinlock, flags);
2368 state = ioctx->state;
2369 switch (state) {
2370 case SRPT_STATE_NEW:
2371 case SRPT_STATE_DATA_IN:
2372 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
2373 break;
2374 case SRPT_STATE_MGMT:
2375 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
2376 break;
2377 default:
2378 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2379 ch, ioctx->ioctx.index, ioctx->state);
2380 break;
2381 }
2382 spin_unlock_irqrestore(&ioctx->spinlock, flags);
2383
55d69427 2384 if (unlikely(WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT)))
b79fafac 2385 return;
a42d985b 2386
a42d985b 2387 /* For read commands, transfer the data to the initiator. */
b99f8e4d
CH		 2388 if (ioctx->cmd.data_direction == DMA_FROM_DEVICE &&
2389 ioctx->cmd.data_length &&
a42d985b 2390 !ioctx->queue_status_only) {
b99f8e4d
CH		 2391 for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
2392 struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
2393
2394 first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,
10fce586 2395 ch->sport->port, NULL, first_wr);
a42d985b
BVA		 2396 }
2397 }
2398
2399 if (state != SRPT_STATE_MGMT)
649ee054 2400 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
a42d985b
BVA		 2401 cmd->scsi_status);
2402 else {
2403 srp_tm_status
2404 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
2405 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
649ee054 2406 ioctx->cmd.tag);
a42d985b 2407 }
b99f8e4d
CH		 2408
2409 atomic_inc(&ch->req_lim);
2410
2411 if (unlikely(atomic_sub_return(1 + ioctx->n_rdma,
2412 &ch->sq_wr_avail) < 0)) {
2413 pr_warn("%s: IB send queue full (needed %d)\n",
2414 __func__, ioctx->n_rdma);
2415 ret = -ENOMEM;
2416 goto out;
2417 }
2418
2419 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len,
2420 DMA_TO_DEVICE);
2421
2422 sge.addr = ioctx->ioctx.dma;
2423 sge.length = resp_len;
74333f12 2424 sge.lkey = sdev->lkey;
b99f8e4d
CH		 2425
2426 ioctx->ioctx.cqe.done = srpt_send_done;
2427 send_wr.next = NULL;
2428 send_wr.wr_cqe = &ioctx->ioctx.cqe;
2429 send_wr.sg_list = &sge;
2430 send_wr.num_sge = 1;
2431 send_wr.opcode = IB_WR_SEND;
2432 send_wr.send_flags = IB_SEND_SIGNALED;
2433
2434 ret = ib_post_send(ch->qp, first_wr, &bad_wr);
2435 if (ret < 0) {
2436 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
2437 __func__, ioctx->cmd.tag, ret);
2438 goto out;
a42d985b 2439 }
b99f8e4d
CH		 2440
2441 return;
2442
2443out:
2444 atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
2445 atomic_dec(&ch->req_lim);
2446 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
2447 target_put_sess_cmd(&ioctx->cmd);
b79fafac 2448}
a42d985b 2449
b79fafac
JE		 2450static int srpt_queue_data_in(struct se_cmd *cmd)
2451{
2452 srpt_queue_response(cmd);
2453 return 0;
2454}
2455
2456static void srpt_queue_tm_rsp(struct se_cmd *cmd)
2457{
2458 srpt_queue_response(cmd);
a42d985b
BVA		 2459}
2460
131e6abc
NB		 2461static void srpt_aborted_task(struct se_cmd *cmd)
2462{
131e6abc
NB		 2463}
2464
a42d985b
BVA		 2465static int srpt_queue_status(struct se_cmd *cmd)
2466{
2467 struct srpt_send_ioctx *ioctx;
2468
2469 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
2470 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
2471 if (cmd->se_cmd_flags &
2472 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
2473 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
2474 ioctx->queue_status_only = true;
b79fafac
JE		 2475 srpt_queue_response(cmd);
2476 return 0;
a42d985b
BVA		 2477}
2478
2479static void srpt_refresh_port_work(struct work_struct *work)
2480{
2481 struct srpt_port *sport = container_of(work, struct srpt_port, work);
2482
2483 srpt_refresh_port(sport);
2484}
2485
a42d985b
BVA		 2486/**
2487 * srpt_release_sdev() - Free the channel resources associated with a target.
2488 */
2489static int srpt_release_sdev(struct srpt_device *sdev)
2490{
aaf45bd8 2491 int i, res;
a42d985b
BVA		 2492
2493 WARN_ON_ONCE(irqs_disabled());
2494
2495 BUG_ON(!sdev);
2496
8628991f 2497 mutex_lock(&sdev->mutex);
aaf45bd8
BVA		 2498 for (i = 0; i < ARRAY_SIZE(sdev->port); i++)
2499 sdev->port[i].enabled = false;
2500 __srpt_close_all_ch(sdev);
8628991f 2501 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 2502
2503 res = wait_event_interruptible(sdev->ch_releaseQ,
8628991f 2504 list_empty_careful(&sdev->rch_list));
a42d985b 2505 if (res)
9f5d32af 2506 pr_err("%s: interrupted.\n", __func__);
a42d985b
BVA		 2507
2508 return 0;
2509}
2510
2bce1a6d 2511static struct se_wwn *__srpt_lookup_wwn(const char *name)
a42d985b
BVA		 2512{
2513 struct ib_device *dev;
2514 struct srpt_device *sdev;
2515 struct srpt_port *sport;
2516 int i;
2517
2518 list_for_each_entry(sdev, &srpt_dev_list, list) {
2519 dev = sdev->device;
2520 if (!dev)
2521 continue;
2522
2523 for (i = 0; i < dev->phys_port_cnt; i++) {
2524 sport = &sdev->port[i];
2525
2bce1a6d
BVA		 2526 if (strcmp(sport->port_guid, name) == 0)
2527 return &sport->port_guid_wwn;
2528 if (strcmp(sport->port_gid, name) == 0)
2529 return &sport->port_gid_wwn;
a42d985b
BVA		 2530 }
2531 }
2532
2533 return NULL;
2534}
2535
2bce1a6d 2536static struct se_wwn *srpt_lookup_wwn(const char *name)
a42d985b 2537{
2bce1a6d 2538 struct se_wwn *wwn;
a42d985b
BVA		 2539
2540 spin_lock(&srpt_dev_lock);
2bce1a6d 2541 wwn = __srpt_lookup_wwn(name);
a42d985b
BVA		 2542 spin_unlock(&srpt_dev_lock);
2543
2bce1a6d 2544 return wwn;
a42d985b
BVA		 2545}
2546
c76d7d64
BVA		 2547static void srpt_free_srq(struct srpt_device *sdev)
2548{
2549 if (!sdev->srq)
2550 return;
2551
2552 ib_destroy_srq(sdev->srq);
2553 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
2554 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
2555 sdev->srq = NULL;
2556}
2557
2558static int srpt_alloc_srq(struct srpt_device *sdev)
2559{
2560 struct ib_srq_init_attr srq_attr = {
2561 .event_handler = srpt_srq_event,
2562 .srq_context = (void *)sdev,
2563 .attr.max_wr = sdev->srq_size,
2564 .attr.max_sge = 1,
2565 .srq_type = IB_SRQT_BASIC,
2566 };
2567 struct ib_device *device = sdev->device;
2568 struct ib_srq *srq;
2569 int i;
2570
2571 WARN_ON_ONCE(sdev->srq);
2572 srq = ib_create_srq(sdev->pd, &srq_attr);
2573 if (IS_ERR(srq)) {
2574 pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq));
2575 return PTR_ERR(srq);
2576 }
2577
2578 pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size,
2579 sdev->device->attrs.max_srq_wr, device->name);
2580
2581 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
2582 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
2583 sizeof(*sdev->ioctx_ring[0]),
2584 srp_max_req_size, DMA_FROM_DEVICE);
2585 if (!sdev->ioctx_ring) {
2586 ib_destroy_srq(srq);
2587 return -ENOMEM;
2588 }
2589
2590 sdev->use_srq = true;
2591 sdev->srq = srq;
2592
2593 for (i = 0; i < sdev->srq_size; ++i)
2594 srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]);
2595
2596 return 0;
2597}
2598
2599static int srpt_use_srq(struct srpt_device *sdev, bool use_srq)
2600{
2601 struct ib_device *device = sdev->device;
2602 int ret = 0;
2603
2604 if (!use_srq) {
2605 srpt_free_srq(sdev);
2606 sdev->use_srq = false;
2607 } else if (use_srq && !sdev->srq) {
2608 ret = srpt_alloc_srq(sdev);
2609 }
2610 pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__, device->name,
2611 sdev->use_srq, ret);
2612 return ret;
2613}
2614
a42d985b
BVA		 2615/**
2616 * srpt_add_one() - Infiniband device addition callback function.
2617 */
2618static void srpt_add_one(struct ib_device *device)
2619{
2620 struct srpt_device *sdev;
2621 struct srpt_port *sport;
a42d985b
BVA		 2622 int i;
2623
e3dfa60c 2624 pr_debug("device = %p\n", device);
a42d985b 2625
9d2aa2b4 2626 sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
a42d985b
BVA		 2627 if (!sdev)
2628 goto err;
2629
2630 sdev->device = device;
2631 INIT_LIST_HEAD(&sdev->rch_list);
2632 init_waitqueue_head(&sdev->ch_releaseQ);
8628991f 2633 mutex_init(&sdev->mutex);
a42d985b 2634
ed082d36 2635 sdev->pd = ib_alloc_pd(device, 0);
a42d985b
BVA		 2636 if (IS_ERR(sdev->pd))
2637 goto free_dev;
2638
74333f12
BVA		 2639 sdev->lkey = sdev->pd->local_dma_lkey;
2640
4a061b28 2641 sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
a42d985b 2642
c76d7d64 2643 srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq);
a42d985b
BVA		 2644
2645 if (!srpt_service_guid)
2646 srpt_service_guid = be64_to_cpu(device->node_guid);
2647
2648 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
2649 if (IS_ERR(sdev->cm_id))
dea26209 2650 goto err_ring;
a42d985b
BVA		 2651
2652 /* print out target login information */
2653 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
2654 "pkey=ffff,service_id=%016llx\n", srpt_service_guid,
2655 srpt_service_guid, srpt_service_guid);
2656
2657 /*
2658 * We do not have a consistent service_id (ie. also id_ext of target_id)
2659 * to identify this target. We currently use the guid of the first HCA
2660 * in the system as service_id; therefore, the target_id will change
2661 * if this HCA is gone bad and replaced by different HCA
2662 */
73fec7fd 2663 if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0))
a42d985b
BVA		 2664 goto err_cm;
2665
2666 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
2667 srpt_event_handler);
dcc9881e 2668 ib_register_event_handler(&sdev->event_handler);
a42d985b 2669
f225066b 2670 WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
a42d985b
BVA		 2671
2672 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
2673 sport = &sdev->port[i - 1];
2674 sport->sdev = sdev;
2675 sport->port = i;
2676 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
2677 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
2678 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
dea26209 2679 sport->port_attrib.use_srq = false;
a42d985b 2680 INIT_WORK(&sport->work, srpt_refresh_port_work);
a42d985b
BVA		 2681
2682 if (srpt_refresh_port(sport)) {
9f5d32af 2683 pr_err("MAD registration failed for %s-%d.\n",
f68cba4e 2684 sdev->device->name, i);
dea26209 2685 goto err_event;
a42d985b 2686 }
a42d985b
BVA		 2687 }
2688
2689 spin_lock(&srpt_dev_lock);
2690 list_add_tail(&sdev->list, &srpt_dev_list);
2691 spin_unlock(&srpt_dev_lock);
2692
2693out:
2694 ib_set_client_data(device, &srpt_client, sdev);
2695 pr_debug("added %s.\n", device->name);
2696 return;
2697
a42d985b
BVA		 2698err_event:
2699 ib_unregister_event_handler(&sdev->event_handler);
2700err_cm:
2701 ib_destroy_cm_id(sdev->cm_id);
dea26209 2702err_ring:
c76d7d64 2703 srpt_free_srq(sdev);
a42d985b
BVA		 2704 ib_dealloc_pd(sdev->pd);
2705free_dev:
2706 kfree(sdev);
2707err:
2708 sdev = NULL;
9f5d32af 2709 pr_info("%s(%s) failed.\n", __func__, device->name);
a42d985b
BVA		 2710 goto out;
2711}
2712
2713/**
2714 * srpt_remove_one() - InfiniBand device removal callback function.
2715 */
7c1eb45a 2716static void srpt_remove_one(struct ib_device *device, void *client_data)
a42d985b 2717{
7c1eb45a 2718 struct srpt_device *sdev = client_data;
a42d985b
BVA		 2719 int i;
2720
a42d985b 2721 if (!sdev) {
9f5d32af 2722 pr_info("%s(%s): nothing to do.\n", __func__, device->name);
a42d985b
BVA		 2723 return;
2724 }
2725
2726 srpt_unregister_mad_agent(sdev);
2727
2728 ib_unregister_event_handler(&sdev->event_handler);
2729
2730 /* Cancel any work queued by the just unregistered IB event handler. */
2731 for (i = 0; i < sdev->device->phys_port_cnt; i++)
2732 cancel_work_sync(&sdev->port[i].work);
2733
2734 ib_destroy_cm_id(sdev->cm_id);
2735
2736 /*
2737 * Unregistering a target must happen after destroying sdev->cm_id
2738 * such that no new SRP_LOGIN_REQ information units can arrive while
2739 * destroying the target.
2740 */
2741 spin_lock(&srpt_dev_lock);
2742 list_del(&sdev->list);
2743 spin_unlock(&srpt_dev_lock);
2744 srpt_release_sdev(sdev);
2745
c76d7d64
BVA		 2746 srpt_free_srq(sdev);
2747
dea26209
BVA		 2748 ib_dealloc_pd(sdev->pd);
2749
a42d985b
BVA		 2750 kfree(sdev);
2751}
2752
2753static struct ib_client srpt_client = {
2754 .name = DRV_NAME,
2755 .add = srpt_add_one,
2756 .remove = srpt_remove_one
2757};
2758
2759static int srpt_check_true(struct se_portal_group *se_tpg)
2760{
2761 return 1;
2762}
2763
2764static int srpt_check_false(struct se_portal_group *se_tpg)
2765{
2766 return 0;
2767}
2768
2769static char *srpt_get_fabric_name(void)
2770{
2771 return "srpt";
2772}
2773
2bce1a6d
BVA		 2774static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg)
2775{
2776 return tpg->se_tpg_wwn->priv;
2777}
2778
a42d985b
BVA		 2779static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
2780{
2bce1a6d 2781 struct srpt_port *sport = srpt_tpg_to_sport(tpg);
a42d985b 2782
2bce1a6d
BVA		 2783 WARN_ON_ONCE(tpg != &sport->port_guid_tpg &&
2784 tpg != &sport->port_gid_tpg);
2785 return tpg == &sport->port_guid_tpg ? sport->port_guid :
2786 sport->port_gid;
a42d985b
BVA		 2787}
2788
2789static u16 srpt_get_tag(struct se_portal_group *tpg)
2790{
2791 return 1;
2792}
2793
a42d985b
BVA		 2794static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
2795{
2796 return 1;
2797}
2798
2799static void srpt_release_cmd(struct se_cmd *se_cmd)
2800{
9474b043
NB		 2801 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
2802 struct srpt_send_ioctx, cmd);
2803 struct srpt_rdma_ch *ch = ioctx->ch;
3c968887 2804 unsigned long flags;
9474b043 2805
bd2c52d7
BVA		 2806 WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE &&
2807 !(ioctx->cmd.transport_state & CMD_T_ABORTED));
9474b043 2808
b99f8e4d
CH		 2809 if (ioctx->n_rw_ctx) {
2810 srpt_free_rw_ctxs(ch, ioctx);
2811 ioctx->n_rw_ctx = 0;
9474b043
NB		 2812 }
2813
3c968887
BVA		 2814 spin_lock_irqsave(&ch->spinlock, flags);
2815 list_add(&ioctx->free_list, &ch->free_list);
2816 spin_unlock_irqrestore(&ch->spinlock, flags);
a42d985b
BVA		 2817}
2818
a42d985b
BVA		 2819/**
2820 * srpt_close_session() - Forcibly close a session.
2821 *
2822 * Callback function invoked by the TCM core to clean up sessions associated
2823 * with a node ACL when the user invokes
2824 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2825 */
2826static void srpt_close_session(struct se_session *se_sess)
2827{
f108f0f6
BVA		 2828 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
2829 struct srpt_device *sdev = ch->sport->sdev;
a42d985b 2830
8628991f 2831 mutex_lock(&sdev->mutex);
01b3ee13 2832 srpt_disconnect_ch_sync(ch);
8628991f 2833 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 2834}
2835
a42d985b
BVA		 2836/**
2837 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
2838 *
2839 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
2840 * This object represents an arbitrary integer used to uniquely identify a
2841 * particular attached remote initiator port to a particular SCSI target port
2842 * within a particular SCSI target device within a particular SCSI instance.
2843 */
2844static u32 srpt_sess_get_index(struct se_session *se_sess)
2845{
2846 return 0;
2847}
2848
2849static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
2850{
2851}
2852
a42d985b
BVA		 2853/* Note: only used from inside debug printk's by the TCM core. */
2854static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
2855{
2856 struct srpt_send_ioctx *ioctx;
2857
2858 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2859 return srpt_get_cmd_state(ioctx);
2860}
2861
2bce1a6d
BVA		 2862static int srpt_parse_guid(u64 *guid, const char *name)
2863{
2864 u16 w[4];
2865 int ret = -EINVAL;
2866
2867 if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4)
2868 goto out;
2869 *guid = get_unaligned_be64(w);
2870 ret = 0;
2871out:
2872 return ret;
2873}
2874
a42d985b
BVA		 2875/**
2876 * srpt_parse_i_port_id() - Parse an initiator port ID.
2877 * @name: ASCII representation of a 128-bit initiator port ID.
2878 * @i_port_id: Binary 128-bit port ID.
2879 */
2880static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
2881{
2882 const char *p;
2883 unsigned len, count, leading_zero_bytes;
c70ca389 2884 int ret;
a42d985b
BVA		 2885
2886 p = name;
b60459f0 2887 if (strncasecmp(p, "0x", 2) == 0)
a42d985b
BVA		 2888 p += 2;
2889 ret = -EINVAL;
2890 len = strlen(p);
2891 if (len % 2)
2892 goto out;
2893 count = min(len / 2, 16U);
2894 leading_zero_bytes = 16 - count;
2895 memset(i_port_id, 0, leading_zero_bytes);
c70ca389
BVA		 2896 ret = hex2bin(i_port_id + leading_zero_bytes, p, count);
2897 if (ret < 0)
2898 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", ret);
a42d985b
BVA		 2899out:
2900 return ret;
2901}
2902
2903/*
2904 * configfs callback function invoked for
2905 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2906 */
c7d6a803 2907static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
a42d985b 2908{
2bce1a6d 2909 u64 guid;
a42d985b 2910 u8 i_port_id[16];
2bce1a6d 2911 int ret;
a42d985b 2912
2bce1a6d
BVA		 2913 ret = srpt_parse_guid(&guid, name);
2914 if (ret < 0)
2915 ret = srpt_parse_i_port_id(i_port_id, name);
2916 if (ret < 0)
9f5d32af 2917 pr_err("invalid initiator port ID %s\n", name);
2bce1a6d 2918 return ret;
a42d985b
BVA		 2919}
2920
2eafd729
CH		 2921static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,
2922 char *page)
a42d985b 2923{
2eafd729 2924 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2bce1a6d 2925 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
a42d985b
BVA		 2926
2927 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
2928}
2929
2eafd729
CH		 2930static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,
2931 const char *page, size_t count)
a42d985b 2932{
2eafd729 2933 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2bce1a6d 2934 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
a42d985b
BVA		 2935 unsigned long val;
2936 int ret;
2937
9d8abf45 2938 ret = kstrtoul(page, 0, &val);
a42d985b 2939 if (ret < 0) {
9d8abf45 2940 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 2941 return -EINVAL;
2942 }
2943 if (val > MAX_SRPT_RDMA_SIZE) {
2944 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
2945 MAX_SRPT_RDMA_SIZE);
2946 return -EINVAL;
2947 }
2948 if (val < DEFAULT_MAX_RDMA_SIZE) {
2949 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
2950 val, DEFAULT_MAX_RDMA_SIZE);
2951 return -EINVAL;
2952 }
2953 sport->port_attrib.srp_max_rdma_size = val;
2954
2955 return count;
2956}
2957
2eafd729
CH		 2958static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,
2959 char *page)
a42d985b 2960{
2eafd729 2961 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2bce1a6d 2962 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
a42d985b
BVA		 2963
2964 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
2965}
2966
2eafd729
CH		 2967static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,
2968 const char *page, size_t count)
a42d985b 2969{
2eafd729 2970 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2bce1a6d 2971 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
a42d985b
BVA		 2972 unsigned long val;
2973 int ret;
2974
9d8abf45 2975 ret = kstrtoul(page, 0, &val);
a42d985b 2976 if (ret < 0) {
9d8abf45 2977 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 2978 return -EINVAL;
2979 }
2980 if (val > MAX_SRPT_RSP_SIZE) {
2981 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
2982 MAX_SRPT_RSP_SIZE);
2983 return -EINVAL;
2984 }
2985 if (val < MIN_MAX_RSP_SIZE) {
2986 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
2987 MIN_MAX_RSP_SIZE);
2988 return -EINVAL;
2989 }
2990 sport->port_attrib.srp_max_rsp_size = val;
2991
2992 return count;
2993}
2994
2eafd729
CH		 2995static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,
2996 char *page)
a42d985b 2997{
2eafd729 2998 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2bce1a6d 2999 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
a42d985b
BVA		 3000
3001 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
3002}
3003
2eafd729
CH		 3004static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,
3005 const char *page, size_t count)
a42d985b 3006{
2eafd729 3007 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2bce1a6d 3008 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
a42d985b
BVA		 3009 unsigned long val;
3010 int ret;
3011
9d8abf45 3012 ret = kstrtoul(page, 0, &val);
a42d985b 3013 if (ret < 0) {
9d8abf45 3014 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 3015 return -EINVAL;
3016 }
3017 if (val > MAX_SRPT_SRQ_SIZE) {
3018 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
3019 MAX_SRPT_SRQ_SIZE);
3020 return -EINVAL;
3021 }
3022 if (val < MIN_SRPT_SRQ_SIZE) {
3023 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
3024 MIN_SRPT_SRQ_SIZE);
3025 return -EINVAL;
3026 }
3027 sport->port_attrib.srp_sq_size = val;
3028
3029 return count;
3030}
3031
dea26209
BVA		 3032static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item,
3033 char *page)
3034{
3035 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3036 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3037
3038 return sprintf(page, "%d\n", sport->port_attrib.use_srq);
3039}
3040
3041static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item,
3042 const char *page, size_t count)
3043{
3044 struct se_portal_group *se_tpg = attrib_to_tpg(item);
3045 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
3046 unsigned long val;
3047 int ret;
3048
3049 ret = kstrtoul(page, 0, &val);
3050 if (ret < 0)
3051 return ret;
3052 if (val != !!val)
3053 return -EINVAL;
3054 sport->port_attrib.use_srq = val;
3055
3056 return count;
3057}
3058
2eafd729
CH		 3059CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);
3060CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);
3061CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);
dea26209 3062CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq);
a42d985b
BVA		 3063
3064static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
2eafd729
CH		 3065 &srpt_tpg_attrib_attr_srp_max_rdma_size,
3066 &srpt_tpg_attrib_attr_srp_max_rsp_size,
3067 &srpt_tpg_attrib_attr_srp_sq_size,
dea26209 3068 &srpt_tpg_attrib_attr_use_srq,
a42d985b
BVA		 3069 NULL,
3070};
3071
2eafd729 3072static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page)
a42d985b 3073{
2eafd729 3074 struct se_portal_group *se_tpg = to_tpg(item);
2bce1a6d 3075 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
a42d985b
BVA		 3076
3077 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
3078}
3079
2eafd729
CH		 3080static ssize_t srpt_tpg_enable_store(struct config_item *item,
3081 const char *page, size_t count)
a42d985b 3082{
2eafd729 3083 struct se_portal_group *se_tpg = to_tpg(item);
2bce1a6d 3084 struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
043a6806
BVA		 3085 struct srpt_device *sdev = sport->sdev;
3086 struct srpt_rdma_ch *ch;
a42d985b
BVA		 3087 unsigned long tmp;
3088 int ret;
3089
9d8abf45 3090 ret = kstrtoul(page, 0, &tmp);
a42d985b 3091 if (ret < 0) {
9f5d32af 3092 pr_err("Unable to extract srpt_tpg_store_enable\n");
a42d985b
BVA		 3093 return -EINVAL;
3094 }
3095
3096 if ((tmp != 0) && (tmp != 1)) {
9f5d32af 3097 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
a42d985b
BVA		 3098 return -EINVAL;
3099 }
043a6806
BVA		 3100 if (sport->enabled == tmp)
3101 goto out;
3102 sport->enabled = tmp;
3103 if (sport->enabled)
3104 goto out;
a42d985b 3105
043a6806
BVA		 3106 mutex_lock(&sdev->mutex);
3107 list_for_each_entry(ch, &sdev->rch_list, list) {
3108 if (ch->sport == sport) {
3109 pr_debug("%s: ch %p %s-%d\n", __func__, ch,
3110 ch->sess_name, ch->qp->qp_num);
3111 srpt_disconnect_ch(ch);
3112 srpt_close_ch(ch);
3113 }
3114 }
3115 mutex_unlock(&sdev->mutex);
3116
3117out:
a42d985b
BVA		 3118 return count;
3119}
3120
2eafd729 3121CONFIGFS_ATTR(srpt_tpg_, enable);
a42d985b
BVA		 3122
3123static struct configfs_attribute *srpt_tpg_attrs[] = {
2eafd729 3124 &srpt_tpg_attr_enable,
a42d985b
BVA		 3125 NULL,
3126};
3127
3128/**
3129 * configfs callback invoked for
3130 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
3131 */
3132static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
3133 struct config_group *group,
3134 const char *name)
3135{
2bce1a6d
BVA		 3136 struct srpt_port *sport = wwn->priv;
3137 static struct se_portal_group *tpg;
a42d985b
BVA		 3138 int res;
3139
2bce1a6d
BVA		 3140 WARN_ON_ONCE(wwn != &sport->port_guid_wwn &&
3141 wwn != &sport->port_gid_wwn);
3142 tpg = wwn == &sport->port_guid_wwn ? &sport->port_guid_tpg :
3143 &sport->port_gid_tpg;
3144 res = core_tpg_register(wwn, tpg, SCSI_PROTOCOL_SRP);
a42d985b
BVA		 3145 if (res)
3146 return ERR_PTR(res);
3147
2bce1a6d 3148 return tpg;
a42d985b
BVA		 3149}
3150
3151/**
3152 * configfs callback invoked for
3153 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
3154 */
3155static void srpt_drop_tpg(struct se_portal_group *tpg)
3156{
2bce1a6d 3157 struct srpt_port *sport = srpt_tpg_to_sport(tpg);
a42d985b
BVA		 3158
3159 sport->enabled = false;
2bce1a6d 3160 core_tpg_deregister(tpg);
a42d985b
BVA		 3161}
3162
3163/**
3164 * configfs callback invoked for
3165 * mkdir /sys/kernel/config/target/$driver/$port
3166 */
3167static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3168 struct config_group *group,
3169 const char *name)
3170{
2bce1a6d 3171 return srpt_lookup_wwn(name) ? : ERR_PTR(-EINVAL);
a42d985b
BVA		 3172}
3173
3174/**
3175 * configfs callback invoked for
3176 * rmdir /sys/kernel/config/target/$driver/$port
3177 */
3178static void srpt_drop_tport(struct se_wwn *wwn)
3179{
a42d985b
BVA		 3180}
3181
2eafd729 3182static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)
a42d985b
BVA		 3183{
3184 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3185}
3186
2eafd729 3187CONFIGFS_ATTR_RO(srpt_wwn_, version);
a42d985b
BVA		 3188
3189static struct configfs_attribute *srpt_wwn_attrs[] = {
2eafd729 3190 &srpt_wwn_attr_version,
a42d985b
BVA		 3191 NULL,
3192};
3193
9ac8928e
CH		 3194static const struct target_core_fabric_ops srpt_template = {
3195 .module = THIS_MODULE,
3196 .name = "srpt",
a42d985b 3197 .get_fabric_name = srpt_get_fabric_name,
a42d985b
BVA		 3198 .tpg_get_wwn = srpt_get_fabric_wwn,
3199 .tpg_get_tag = srpt_get_tag,
a42d985b
BVA		 3200 .tpg_check_demo_mode = srpt_check_false,
3201 .tpg_check_demo_mode_cache = srpt_check_true,
3202 .tpg_check_demo_mode_write_protect = srpt_check_true,
3203 .tpg_check_prod_mode_write_protect = srpt_check_false,
a42d985b
BVA		 3204 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3205 .release_cmd = srpt_release_cmd,
3206 .check_stop_free = srpt_check_stop_free,
a42d985b 3207 .close_session = srpt_close_session,
a42d985b
BVA		 3208 .sess_get_index = srpt_sess_get_index,
3209 .sess_get_initiator_sid = NULL,
3210 .write_pending = srpt_write_pending,
3211 .write_pending_status = srpt_write_pending_status,
3212 .set_default_node_attributes = srpt_set_default_node_attrs,
a42d985b 3213 .get_cmd_state = srpt_get_tcm_cmd_state,
b79fafac 3214 .queue_data_in = srpt_queue_data_in,
a42d985b 3215 .queue_status = srpt_queue_status,
b79fafac 3216 .queue_tm_rsp = srpt_queue_tm_rsp,
131e6abc 3217 .aborted_task = srpt_aborted_task,
a42d985b
BVA		 3218 /*
3219 * Setup function pointers for generic logic in
3220 * target_core_fabric_configfs.c
3221 */
3222 .fabric_make_wwn = srpt_make_tport,
3223 .fabric_drop_wwn = srpt_drop_tport,
3224 .fabric_make_tpg = srpt_make_tpg,
3225 .fabric_drop_tpg = srpt_drop_tpg,
c7d6a803 3226 .fabric_init_nodeacl = srpt_init_nodeacl,
9ac8928e
CH		 3227
3228 .tfc_wwn_attrs = srpt_wwn_attrs,
3229 .tfc_tpg_base_attrs = srpt_tpg_attrs,
3230 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
a42d985b
BVA		 3231};
3232
3233/**
3234 * srpt_init_module() - Kernel module initialization.
3235 *
3236 * Note: Since ib_register_client() registers callback functions, and since at
3237 * least one of these callback functions (srpt_add_one()) calls target core
3238 * functions, this driver must be registered with the target core before
3239 * ib_register_client() is called.
3240 */
3241static int __init srpt_init_module(void)
3242{
3243 int ret;
3244
3245 ret = -EINVAL;
3246 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
9f5d32af 3247 pr_err("invalid value %d for kernel module parameter"
a42d985b
BVA		 3248 " srp_max_req_size -- must be at least %d.\n",
3249 srp_max_req_size, MIN_MAX_REQ_SIZE);
3250 goto out;
3251 }
3252
3253 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3254 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
9f5d32af 3255 pr_err("invalid value %d for kernel module parameter"
a42d985b
BVA		 3256 " srpt_srq_size -- must be in the range [%d..%d].\n",
3257 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3258 goto out;
3259 }
3260
9ac8928e
CH		 3261 ret = target_register_template(&srpt_template);
3262 if (ret)
a42d985b 3263 goto out;
a42d985b
BVA		 3264
3265 ret = ib_register_client(&srpt_client);
3266 if (ret) {
9f5d32af 3267 pr_err("couldn't register IB client\n");
a42d985b
BVA		 3268 goto out_unregister_target;
3269 }
3270
3271 return 0;
3272
3273out_unregister_target:
9ac8928e 3274 target_unregister_template(&srpt_template);
a42d985b
BVA		 3275out:
3276 return ret;
3277}
3278
3279static void __exit srpt_cleanup_module(void)
3280{
3281 ib_unregister_client(&srpt_client);
9ac8928e 3282 target_unregister_template(&srpt_template);
a42d985b
BVA		 3283}
3284
3285module_init(srpt_init_module);
3286module_exit(srpt_cleanup_module);
Linux 6.x block layer and io_uring tree(s)