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IB/srpt: Detect session shutdown reliably
[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);
aaf45bd8 99static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc);
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;
257 cif->resp_time_value = 20;
258
259 mad->mad_hdr.status = 0;
260}
261
262/**
263 * srpt_get_iou() - Write IOUnitInfo to a management datagram.
264 *
265 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
266 * Specification. See also section B.7, table B.6 in the SRP r16a document.
267 */
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;
298
299 iocp = (struct ib_dm_ioc_profile *)mad->data;
300
301 if (!slot || slot > 16) {
302 mad->mad_hdr.status
b356c1c1 303 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
a42d985b
BVA		 304 return;
305 }
306
307 if (slot > 2) {
308 mad->mad_hdr.status
b356c1c1 309 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
a42d985b
BVA		 310 return;
311 }
312
9d2aa2b4 313 memset(iocp, 0, sizeof(*iocp));
a42d985b
BVA		 314 strcpy(iocp->id_string, SRPT_ID_STRING);
315 iocp->guid = cpu_to_be64(srpt_service_guid);
4a061b28
OG		 316 iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
317 iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);
318 iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);
319 iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
a42d985b 320 iocp->subsys_device_id = 0x0;
b356c1c1
VT		 321 iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
322 iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
323 iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
324 iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
a42d985b
BVA		 325 iocp->send_queue_depth = cpu_to_be16(sdev->srq_size);
326 iocp->rdma_read_depth = 4;
327 iocp->send_size = cpu_to_be32(srp_max_req_size);
328 iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
329 1U << 24));
330 iocp->num_svc_entries = 1;
331 iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
332 SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
333
334 mad->mad_hdr.status = 0;
335}
336
337/**
338 * srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
339 *
340 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
341 * Specification. See also section B.7, table B.8 in the SRP r16a document.
342 */
343static void srpt_get_svc_entries(u64 ioc_guid,
344 u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
345{
346 struct ib_dm_svc_entries *svc_entries;
347
348 WARN_ON(!ioc_guid);
349
350 if (!slot || slot > 16) {
351 mad->mad_hdr.status
b356c1c1 352 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
a42d985b
BVA		 353 return;
354 }
355
356 if (slot > 2 || lo > hi || hi > 1) {
357 mad->mad_hdr.status
b356c1c1 358 = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
a42d985b
BVA		 359 return;
360 }
361
362 svc_entries = (struct ib_dm_svc_entries *)mad->data;
9d2aa2b4 363 memset(svc_entries, 0, sizeof(*svc_entries));
a42d985b
BVA		 364 svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
365 snprintf(svc_entries->service_entries[0].name,
366 sizeof(svc_entries->service_entries[0].name),
367 "%s%016llx",
368 SRP_SERVICE_NAME_PREFIX,
369 ioc_guid);
370
371 mad->mad_hdr.status = 0;
372}
373
374/**
375 * srpt_mgmt_method_get() - Process a received management datagram.
376 * @sp: source port through which the MAD has been received.
377 * @rq_mad: received MAD.
378 * @rsp_mad: response MAD.
379 */
380static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
381 struct ib_dm_mad *rsp_mad)
382{
383 u16 attr_id;
384 u32 slot;
385 u8 hi, lo;
386
387 attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
388 switch (attr_id) {
389 case DM_ATTR_CLASS_PORT_INFO:
390 srpt_get_class_port_info(rsp_mad);
391 break;
392 case DM_ATTR_IOU_INFO:
393 srpt_get_iou(rsp_mad);
394 break;
395 case DM_ATTR_IOC_PROFILE:
396 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
397 srpt_get_ioc(sp, slot, rsp_mad);
398 break;
399 case DM_ATTR_SVC_ENTRIES:
400 slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
401 hi = (u8) ((slot >> 8) & 0xff);
402 lo = (u8) (slot & 0xff);
403 slot = (u16) ((slot >> 16) & 0xffff);
404 srpt_get_svc_entries(srpt_service_guid,
405 slot, hi, lo, rsp_mad);
406 break;
407 default:
408 rsp_mad->mad_hdr.status =
b356c1c1 409 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
a42d985b
BVA		 410 break;
411 }
412}
413
414/**
415 * srpt_mad_send_handler() - Post MAD-send callback function.
416 */
417static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
418 struct ib_mad_send_wc *mad_wc)
419{
420 ib_destroy_ah(mad_wc->send_buf->ah);
421 ib_free_send_mad(mad_wc->send_buf);
422}
423
424/**
425 * srpt_mad_recv_handler() - MAD reception callback function.
426 */
427static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
ca281265 428 struct ib_mad_send_buf *send_buf,
a42d985b
BVA		 429 struct ib_mad_recv_wc *mad_wc)
430{
431 struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
432 struct ib_ah *ah;
433 struct ib_mad_send_buf *rsp;
434 struct ib_dm_mad *dm_mad;
435
436 if (!mad_wc || !mad_wc->recv_buf.mad)
437 return;
438
439 ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
440 mad_wc->recv_buf.grh, mad_agent->port_num);
441 if (IS_ERR(ah))
442 goto err;
443
444 BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
445
446 rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
447 mad_wc->wc->pkey_index, 0,
448 IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
da2dfaa3
IW		 449 GFP_KERNEL,
450 IB_MGMT_BASE_VERSION);
a42d985b
BVA		 451 if (IS_ERR(rsp))
452 goto err_rsp;
453
454 rsp->ah = ah;
455
456 dm_mad = rsp->mad;
9d2aa2b4 457 memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad));
a42d985b
BVA		 458 dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
459 dm_mad->mad_hdr.status = 0;
460
461 switch (mad_wc->recv_buf.mad->mad_hdr.method) {
462 case IB_MGMT_METHOD_GET:
463 srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
464 break;
465 case IB_MGMT_METHOD_SET:
466 dm_mad->mad_hdr.status =
b356c1c1 467 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
a42d985b
BVA		 468 break;
469 default:
470 dm_mad->mad_hdr.status =
b356c1c1 471 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
a42d985b
BVA		 472 break;
473 }
474
475 if (!ib_post_send_mad(rsp, NULL)) {
476 ib_free_recv_mad(mad_wc);
477 /* will destroy_ah & free_send_mad in send completion */
478 return;
479 }
480
481 ib_free_send_mad(rsp);
482
483err_rsp:
484 ib_destroy_ah(ah);
485err:
486 ib_free_recv_mad(mad_wc);
487}
488
489/**
490 * srpt_refresh_port() - Configure a HCA port.
491 *
492 * Enable InfiniBand management datagram processing, update the cached sm_lid,
493 * lid and gid values, and register a callback function for processing MADs
494 * on the specified port.
495 *
496 * Note: It is safe to call this function more than once for the same port.
497 */
498static int srpt_refresh_port(struct srpt_port *sport)
499{
500 struct ib_mad_reg_req reg_req;
501 struct ib_port_modify port_modify;
502 struct ib_port_attr port_attr;
503 int ret;
504
9d2aa2b4 505 memset(&port_modify, 0, sizeof(port_modify));
a42d985b
BVA		 506 port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
507 port_modify.clr_port_cap_mask = 0;
508
509 ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
510 if (ret)
511 goto err_mod_port;
512
513 ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
514 if (ret)
515 goto err_query_port;
516
517 sport->sm_lid = port_attr.sm_lid;
518 sport->lid = port_attr.lid;
519
55ee3ab2
MB		 520 ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid,
521 NULL);
a42d985b
BVA		 522 if (ret)
523 goto err_query_port;
524
525 if (!sport->mad_agent) {
9d2aa2b4 526 memset(&reg_req, 0, sizeof(reg_req));
a42d985b
BVA		 527 reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
528 reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
529 set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
530 set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
531
532 sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
533 sport->port,
534 IB_QPT_GSI,
535 &reg_req, 0,
536 srpt_mad_send_handler,
537 srpt_mad_recv_handler,
0f29b46d 538 sport, 0);
a42d985b
BVA		 539 if (IS_ERR(sport->mad_agent)) {
540 ret = PTR_ERR(sport->mad_agent);
541 sport->mad_agent = NULL;
542 goto err_query_port;
543 }
544 }
545
546 return 0;
547
548err_query_port:
549
550 port_modify.set_port_cap_mask = 0;
551 port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
552 ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
553
554err_mod_port:
555
556 return ret;
557}
558
559/**
560 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
561 *
562 * Note: It is safe to call this function more than once for the same device.
563 */
564static void srpt_unregister_mad_agent(struct srpt_device *sdev)
565{
566 struct ib_port_modify port_modify = {
567 .clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
568 };
569 struct srpt_port *sport;
570 int i;
571
572 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
573 sport = &sdev->port[i - 1];
574 WARN_ON(sport->port != i);
575 if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
9f5d32af 576 pr_err("disabling MAD processing failed.\n");
a42d985b
BVA		 577 if (sport->mad_agent) {
578 ib_unregister_mad_agent(sport->mad_agent);
579 sport->mad_agent = NULL;
580 }
581 }
582}
583
584/**
585 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
586 */
587static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
588 int ioctx_size, int dma_size,
589 enum dma_data_direction dir)
590{
591 struct srpt_ioctx *ioctx;
592
593 ioctx = kmalloc(ioctx_size, GFP_KERNEL);
594 if (!ioctx)
595 goto err;
596
597 ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
598 if (!ioctx->buf)
599 goto err_free_ioctx;
600
601 ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
602 if (ib_dma_mapping_error(sdev->device, ioctx->dma))
603 goto err_free_buf;
604
605 return ioctx;
606
607err_free_buf:
608 kfree(ioctx->buf);
609err_free_ioctx:
610 kfree(ioctx);
611err:
612 return NULL;
613}
614
615/**
616 * srpt_free_ioctx() - Free an SRPT I/O context structure.
617 */
618static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
619 int dma_size, enum dma_data_direction dir)
620{
621 if (!ioctx)
622 return;
623
624 ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
625 kfree(ioctx->buf);
626 kfree(ioctx);
627}
628
629/**
630 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
631 * @sdev: Device to allocate the I/O context ring for.
632 * @ring_size: Number of elements in the I/O context ring.
633 * @ioctx_size: I/O context size.
634 * @dma_size: DMA buffer size.
635 * @dir: DMA data direction.
636 */
637static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
638 int ring_size, int ioctx_size,
639 int dma_size, enum dma_data_direction dir)
640{
641 struct srpt_ioctx **ring;
642 int i;
643
644 WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx)
645 && ioctx_size != sizeof(struct srpt_send_ioctx));
646
647 ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
648 if (!ring)
649 goto out;
650 for (i = 0; i < ring_size; ++i) {
651 ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
652 if (!ring[i])
653 goto err;
654 ring[i]->index = i;
655 }
656 goto out;
657
658err:
659 while (--i >= 0)
660 srpt_free_ioctx(sdev, ring[i], dma_size, dir);
661 kfree(ring);
715252d4 662 ring = NULL;
a42d985b
BVA		 663out:
664 return ring;
665}
666
667/**
668 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
669 */
670static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
671 struct srpt_device *sdev, int ring_size,
672 int dma_size, enum dma_data_direction dir)
673{
674 int i;
675
676 for (i = 0; i < ring_size; ++i)
677 srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
678 kfree(ioctx_ring);
679}
680
681/**
682 * srpt_get_cmd_state() - Get the state of a SCSI command.
683 */
684static enum srpt_command_state srpt_get_cmd_state(struct srpt_send_ioctx *ioctx)
685{
686 enum srpt_command_state state;
687 unsigned long flags;
688
689 BUG_ON(!ioctx);
690
691 spin_lock_irqsave(&ioctx->spinlock, flags);
692 state = ioctx->state;
693 spin_unlock_irqrestore(&ioctx->spinlock, flags);
694 return state;
695}
696
697/**
698 * srpt_set_cmd_state() - Set the state of a SCSI command.
699 *
700 * Does not modify the state of aborted commands. Returns the previous command
701 * state.
702 */
703static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
704 enum srpt_command_state new)
705{
706 enum srpt_command_state previous;
707 unsigned long flags;
708
709 BUG_ON(!ioctx);
710
711 spin_lock_irqsave(&ioctx->spinlock, flags);
712 previous = ioctx->state;
713 if (previous != SRPT_STATE_DONE)
714 ioctx->state = new;
715 spin_unlock_irqrestore(&ioctx->spinlock, flags);
716
717 return previous;
718}
719
720/**
721 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
722 *
723 * Returns true if and only if the previous command state was equal to 'old'.
724 */
725static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
726 enum srpt_command_state old,
727 enum srpt_command_state new)
728{
729 enum srpt_command_state previous;
730 unsigned long flags;
731
732 WARN_ON(!ioctx);
733 WARN_ON(old == SRPT_STATE_DONE);
734 WARN_ON(new == SRPT_STATE_NEW);
735
736 spin_lock_irqsave(&ioctx->spinlock, flags);
737 previous = ioctx->state;
738 if (previous == old)
739 ioctx->state = new;
740 spin_unlock_irqrestore(&ioctx->spinlock, flags);
741 return previous == old;
742}
743
744/**
745 * srpt_post_recv() - Post an IB receive request.
746 */
747static int srpt_post_recv(struct srpt_device *sdev,
748 struct srpt_recv_ioctx *ioctx)
749{
750 struct ib_sge list;
751 struct ib_recv_wr wr, *bad_wr;
752
753 BUG_ON(!sdev);
a42d985b
BVA		 754 list.addr = ioctx->ioctx.dma;
755 list.length = srp_max_req_size;
5a783956 756 list.lkey = sdev->pd->local_dma_lkey;
a42d985b 757
59fae4de
CH		 758 ioctx->ioctx.cqe.done = srpt_recv_done;
759 wr.wr_cqe = &ioctx->ioctx.cqe;
a42d985b
BVA		 760 wr.next = NULL;
761 wr.sg_list = &list;
762 wr.num_sge = 1;
763
764 return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
765}
766
767/**
768 * srpt_post_send() - Post an IB send request.
769 *
770 * Returns zero upon success and a non-zero value upon failure.
771 */
772static int srpt_post_send(struct srpt_rdma_ch *ch,
773 struct srpt_send_ioctx *ioctx, int len)
774{
775 struct ib_sge list;
776 struct ib_send_wr wr, *bad_wr;
777 struct srpt_device *sdev = ch->sport->sdev;
778 int ret;
779
780 atomic_inc(&ch->req_lim);
781
782 ret = -ENOMEM;
783 if (unlikely(atomic_dec_return(&ch->sq_wr_avail) < 0)) {
9f5d32af 784 pr_warn("IB send queue full (needed 1)\n");
a42d985b
BVA		 785 goto out;
786 }
787
788 ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len,
789 DMA_TO_DEVICE);
790
791 list.addr = ioctx->ioctx.dma;
792 list.length = len;
5a783956 793 list.lkey = sdev->pd->local_dma_lkey;
a42d985b 794
59fae4de 795 ioctx->ioctx.cqe.done = srpt_send_done;
a42d985b 796 wr.next = NULL;
59fae4de 797 wr.wr_cqe = &ioctx->ioctx.cqe;
a42d985b
BVA		 798 wr.sg_list = &list;
799 wr.num_sge = 1;
800 wr.opcode = IB_WR_SEND;
801 wr.send_flags = IB_SEND_SIGNALED;
802
803 ret = ib_post_send(ch->qp, &wr, &bad_wr);
804
805out:
806 if (ret < 0) {
807 atomic_inc(&ch->sq_wr_avail);
808 atomic_dec(&ch->req_lim);
809 }
810 return ret;
811}
812
aaf45bd8
BVA		 813/**
814 * srpt_zerolength_write() - Perform a zero-length RDMA write.
815 *
816 * A quote from the InfiniBand specification: C9-88: For an HCA responder
817 * using Reliable Connection service, for each zero-length RDMA READ or WRITE
818 * request, the R_Key shall not be validated, even if the request includes
819 * Immediate data.
820 */
821static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
822{
823 struct ib_send_wr wr, *bad_wr;
824
825 memset(&wr, 0, sizeof(wr));
826 wr.opcode = IB_WR_RDMA_WRITE;
827 wr.wr_cqe = &ch->zw_cqe;
828 wr.send_flags = IB_SEND_SIGNALED;
829 return ib_post_send(ch->qp, &wr, &bad_wr);
830}
831
832static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
833{
834 struct srpt_rdma_ch *ch = cq->cq_context;
835
836 WARN(wc->status == IB_WC_SUCCESS, "%s-%d: QP not in error state\n",
837 ch->sess_name, ch->qp->qp_num);
838 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
839 schedule_work(&ch->release_work);
840 else
841 WARN_ONCE("%s-%d\n", ch->sess_name, ch->qp->qp_num);
842}
843
a42d985b
BVA		 844/**
845 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
846 * @ioctx: Pointer to the I/O context associated with the request.
847 * @srp_cmd: Pointer to the SRP_CMD request data.
848 * @dir: Pointer to the variable to which the transfer direction will be
849 * written.
850 * @data_len: Pointer to the variable to which the total data length of all
851 * descriptors in the SRP_CMD request will be written.
852 *
853 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
854 *
855 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
856 * -ENOMEM when memory allocation fails and zero upon success.
857 */
858static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
859 struct srp_cmd *srp_cmd,
860 enum dma_data_direction *dir, u64 *data_len)
861{
862 struct srp_indirect_buf *idb;
863 struct srp_direct_buf *db;
864 unsigned add_cdb_offset;
865 int ret;
866
867 /*
868 * The pointer computations below will only be compiled correctly
869 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
870 * whether srp_cmd::add_data has been declared as a byte pointer.
871 */
872 BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0)
873 && !__same_type(srp_cmd->add_data[0], (u8)0));
874
875 BUG_ON(!dir);
876 BUG_ON(!data_len);
877
878 ret = 0;
879 *data_len = 0;
880
881 /*
882 * The lower four bits of the buffer format field contain the DATA-IN
883 * buffer descriptor format, and the highest four bits contain the
884 * DATA-OUT buffer descriptor format.
885 */
886 *dir = DMA_NONE;
887 if (srp_cmd->buf_fmt & 0xf)
888 /* DATA-IN: transfer data from target to initiator (read). */
889 *dir = DMA_FROM_DEVICE;
890 else if (srp_cmd->buf_fmt >> 4)
891 /* DATA-OUT: transfer data from initiator to target (write). */
892 *dir = DMA_TO_DEVICE;
893
894 /*
895 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
896 * CDB LENGTH' field are reserved and the size in bytes of this field
897 * is four times the value specified in bits 3..7. Hence the "& ~3".
898 */
899 add_cdb_offset = srp_cmd->add_cdb_len & ~3;
900 if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
901 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
902 ioctx->n_rbuf = 1;
903 ioctx->rbufs = &ioctx->single_rbuf;
904
905 db = (struct srp_direct_buf *)(srp_cmd->add_data
906 + add_cdb_offset);
9d2aa2b4 907 memcpy(ioctx->rbufs, db, sizeof(*db));
a42d985b
BVA		 908 *data_len = be32_to_cpu(db->len);
909 } else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
910 ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
911 idb = (struct srp_indirect_buf *)(srp_cmd->add_data
912 + add_cdb_offset);
913
9d2aa2b4 914 ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof(*db);
a42d985b
BVA		 915
916 if (ioctx->n_rbuf >
917 (srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
9f5d32af 918 pr_err("received unsupported SRP_CMD request"
a42d985b
BVA		 919 " type (%u out + %u in != %u / %zu)\n",
920 srp_cmd->data_out_desc_cnt,
921 srp_cmd->data_in_desc_cnt,
922 be32_to_cpu(idb->table_desc.len),
923 sizeof(*db));
924 ioctx->n_rbuf = 0;
925 ret = -EINVAL;
926 goto out;
927 }
928
929 if (ioctx->n_rbuf == 1)
930 ioctx->rbufs = &ioctx->single_rbuf;
931 else {
932 ioctx->rbufs =
9d2aa2b4 933 kmalloc(ioctx->n_rbuf * sizeof(*db), GFP_ATOMIC);
a42d985b
BVA		 934 if (!ioctx->rbufs) {
935 ioctx->n_rbuf = 0;
936 ret = -ENOMEM;
937 goto out;
938 }
939 }
940
941 db = idb->desc_list;
9d2aa2b4 942 memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof(*db));
a42d985b
BVA		 943 *data_len = be32_to_cpu(idb->len);
944 }
945out:
946 return ret;
947}
948
949/**
950 * srpt_init_ch_qp() - Initialize queue pair attributes.
951 *
952 * Initialized the attributes of queue pair 'qp' by allowing local write,
953 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
954 */
955static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
956{
957 struct ib_qp_attr *attr;
958 int ret;
959
9d2aa2b4 960 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
a42d985b
BVA		 961 if (!attr)
962 return -ENOMEM;
963
964 attr->qp_state = IB_QPS_INIT;
965 attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
966 IB_ACCESS_REMOTE_WRITE;
967 attr->port_num = ch->sport->port;
968 attr->pkey_index = 0;
969
970 ret = ib_modify_qp(qp, attr,
971 IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
972 IB_QP_PKEY_INDEX);
973
974 kfree(attr);
975 return ret;
976}
977
978/**
979 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
980 * @ch: channel of the queue pair.
981 * @qp: queue pair to change the state of.
982 *
983 * Returns zero upon success and a negative value upon failure.
984 *
985 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
986 * If this structure ever becomes larger, it might be necessary to allocate
987 * it dynamically instead of on the stack.
988 */
989static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
990{
991 struct ib_qp_attr qp_attr;
992 int attr_mask;
993 int ret;
994
995 qp_attr.qp_state = IB_QPS_RTR;
996 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
997 if (ret)
998 goto out;
999
1000 qp_attr.max_dest_rd_atomic = 4;
1001
1002 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1003
1004out:
1005 return ret;
1006}
1007
1008/**
1009 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1010 * @ch: channel of the queue pair.
1011 * @qp: queue pair to change the state of.
1012 *
1013 * Returns zero upon success and a negative value upon failure.
1014 *
1015 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1016 * If this structure ever becomes larger, it might be necessary to allocate
1017 * it dynamically instead of on the stack.
1018 */
1019static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
1020{
1021 struct ib_qp_attr qp_attr;
1022 int attr_mask;
1023 int ret;
1024
1025 qp_attr.qp_state = IB_QPS_RTS;
1026 ret = ib_cm_init_qp_attr(ch->cm_id, &qp_attr, &attr_mask);
1027 if (ret)
1028 goto out;
1029
1030 qp_attr.max_rd_atomic = 4;
1031
1032 ret = ib_modify_qp(qp, &qp_attr, attr_mask);
1033
1034out:
1035 return ret;
1036}
1037
1038/**
1039 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1040 */
1041static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
1042{
1043 struct ib_qp_attr qp_attr;
1044
1045 qp_attr.qp_state = IB_QPS_ERR;
1046 return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
1047}
1048
1049/**
1050 * srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list.
1051 */
1052static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1053 struct srpt_send_ioctx *ioctx)
1054{
1055 struct scatterlist *sg;
1056 enum dma_data_direction dir;
1057
1058 BUG_ON(!ch);
1059 BUG_ON(!ioctx);
59fae4de 1060 BUG_ON(ioctx->n_rdma && !ioctx->rdma_wrs);
a42d985b
BVA		 1061
1062 while (ioctx->n_rdma)
59fae4de 1063 kfree(ioctx->rdma_wrs[--ioctx->n_rdma].wr.sg_list);
a42d985b 1064
59fae4de
CH		 1065 kfree(ioctx->rdma_wrs);
1066 ioctx->rdma_wrs = NULL;
a42d985b
BVA		 1067
1068 if (ioctx->mapped_sg_count) {
1069 sg = ioctx->sg;
1070 WARN_ON(!sg);
1071 dir = ioctx->cmd.data_direction;
1072 BUG_ON(dir == DMA_NONE);
1073 ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt,
671ec1b2 1074 target_reverse_dma_direction(&ioctx->cmd));
a42d985b
BVA		 1075 ioctx->mapped_sg_count = 0;
1076 }
1077}
1078
1079/**
1080 * srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list.
1081 */
1082static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
1083 struct srpt_send_ioctx *ioctx)
1084{
b0768080 1085 struct ib_device *dev = ch->sport->sdev->device;
a42d985b
BVA		 1086 struct se_cmd *cmd;
1087 struct scatterlist *sg, *sg_orig;
1088 int sg_cnt;
1089 enum dma_data_direction dir;
59fae4de 1090 struct ib_rdma_wr *riu;
a42d985b
BVA		 1091 struct srp_direct_buf *db;
1092 dma_addr_t dma_addr;
1093 struct ib_sge *sge;
1094 u64 raddr;
1095 u32 rsize;
1096 u32 tsize;
1097 u32 dma_len;
1098 int count, nrdma;
1099 int i, j, k;
1100
1101 BUG_ON(!ch);
1102 BUG_ON(!ioctx);
1103 cmd = &ioctx->cmd;
1104 dir = cmd->data_direction;
1105 BUG_ON(dir == DMA_NONE);
1106
6f9e7f01
RD		 1107 ioctx->sg = sg = sg_orig = cmd->t_data_sg;
1108 ioctx->sg_cnt = sg_cnt = cmd->t_data_nents;
a42d985b
BVA		 1109
1110 count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt,
671ec1b2 1111 target_reverse_dma_direction(cmd));
a42d985b
BVA		 1112 if (unlikely(!count))
1113 return -EAGAIN;
1114
1115 ioctx->mapped_sg_count = count;
1116
59fae4de
CH		 1117 if (ioctx->rdma_wrs && ioctx->n_rdma_wrs)
1118 nrdma = ioctx->n_rdma_wrs;
a42d985b
BVA		 1119 else {
1120 nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE
1121 + ioctx->n_rbuf;
1122
59fae4de
CH		 1123 ioctx->rdma_wrs = kcalloc(nrdma, sizeof(*ioctx->rdma_wrs),
1124 GFP_KERNEL);
1125 if (!ioctx->rdma_wrs)
a42d985b
BVA		 1126 goto free_mem;
1127
59fae4de 1128 ioctx->n_rdma_wrs = nrdma;
a42d985b
BVA		 1129 }
1130
1131 db = ioctx->rbufs;
1132 tsize = cmd->data_length;
b0768080 1133 dma_len = ib_sg_dma_len(dev, &sg[0]);
59fae4de 1134 riu = ioctx->rdma_wrs;
a42d985b
BVA		 1135
1136 /*
1137 * For each remote desc - calculate the #ib_sge.
1138 * If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then
1139 * each remote desc rdma_iu is required a rdma wr;
1140 * else
1141 * we need to allocate extra rdma_iu to carry extra #ib_sge in
1142 * another rdma wr
1143 */
1144 for (i = 0, j = 0;
1145 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1146 rsize = be32_to_cpu(db->len);
1147 raddr = be64_to_cpu(db->va);
59fae4de 1148 riu->remote_addr = raddr;
a42d985b 1149 riu->rkey = be32_to_cpu(db->key);
59fae4de 1150 riu->wr.num_sge = 0;
a42d985b
BVA		 1151
1152 /* calculate how many sge required for this remote_buf */
1153 while (rsize > 0 && tsize > 0) {
1154
1155 if (rsize >= dma_len) {
1156 tsize -= dma_len;
1157 rsize -= dma_len;
1158 raddr += dma_len;
1159
1160 if (tsize > 0) {
1161 ++j;
1162 if (j < count) {
1163 sg = sg_next(sg);
b0768080
MM		 1164 dma_len = ib_sg_dma_len(
1165 dev, sg);
a42d985b
BVA		 1166 }
1167 }
1168 } else {
1169 tsize -= rsize;
1170 dma_len -= rsize;
1171 rsize = 0;
1172 }
1173
59fae4de 1174 ++riu->wr.num_sge;
a42d985b 1175
59fae4de
CH		 1176 if (rsize > 0 &&
1177 riu->wr.num_sge == SRPT_DEF_SG_PER_WQE) {
a42d985b 1178 ++ioctx->n_rdma;
59fae4de
CH		 1179 riu->wr.sg_list = kmalloc_array(riu->wr.num_sge,
1180 sizeof(*riu->wr.sg_list),
1181 GFP_KERNEL);
1182 if (!riu->wr.sg_list)
a42d985b
BVA		 1183 goto free_mem;
1184
1185 ++riu;
59fae4de
CH		 1186 riu->wr.num_sge = 0;
1187 riu->remote_addr = raddr;
a42d985b
BVA		 1188 riu->rkey = be32_to_cpu(db->key);
1189 }
1190 }
1191
1192 ++ioctx->n_rdma;
59fae4de
CH		 1193 riu->wr.sg_list = kmalloc_array(riu->wr.num_sge,
1194 sizeof(*riu->wr.sg_list),
1195 GFP_KERNEL);
1196 if (!riu->wr.sg_list)
a42d985b
BVA		 1197 goto free_mem;
1198 }
1199
1200 db = ioctx->rbufs;
1201 tsize = cmd->data_length;
59fae4de 1202 riu = ioctx->rdma_wrs;
a42d985b 1203 sg = sg_orig;
b0768080
MM		 1204 dma_len = ib_sg_dma_len(dev, &sg[0]);
1205 dma_addr = ib_sg_dma_address(dev, &sg[0]);
a42d985b
BVA		 1206
1207 /* this second loop is really mapped sg_addres to rdma_iu->ib_sge */
1208 for (i = 0, j = 0;
1209 j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
1210 rsize = be32_to_cpu(db->len);
59fae4de 1211 sge = riu->wr.sg_list;
a42d985b
BVA		 1212 k = 0;
1213
1214 while (rsize > 0 && tsize > 0) {
1215 sge->addr = dma_addr;
5a783956 1216 sge->lkey = ch->sport->sdev->pd->local_dma_lkey;
a42d985b
BVA		 1217
1218 if (rsize >= dma_len) {
1219 sge->length =
1220 (tsize < dma_len) ? tsize : dma_len;
1221 tsize -= dma_len;
1222 rsize -= dma_len;
1223
1224 if (tsize > 0) {
1225 ++j;
1226 if (j < count) {
1227 sg = sg_next(sg);
b0768080
MM		 1228 dma_len = ib_sg_dma_len(
1229 dev, sg);
1230 dma_addr = ib_sg_dma_address(
1231 dev, sg);
a42d985b
BVA		 1232 }
1233 }
1234 } else {
1235 sge->length = (tsize < rsize) ? tsize : rsize;
1236 tsize -= rsize;
1237 dma_len -= rsize;
1238 dma_addr += rsize;
1239 rsize = 0;
1240 }
1241
1242 ++k;
59fae4de 1243 if (k == riu->wr.num_sge && rsize > 0 && tsize > 0) {
a42d985b 1244 ++riu;
59fae4de 1245 sge = riu->wr.sg_list;
a42d985b
BVA		 1246 k = 0;
1247 } else if (rsize > 0 && tsize > 0)
1248 ++sge;
1249 }
1250 }
1251
1252 return 0;
1253
1254free_mem:
1255 srpt_unmap_sg_to_ib_sge(ch, ioctx);
1256
1257 return -ENOMEM;
1258}
1259
1260/**
1261 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1262 */
1263static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
1264{
1265 struct srpt_send_ioctx *ioctx;
1266 unsigned long flags;
1267
1268 BUG_ON(!ch);
1269
1270 ioctx = NULL;
1271 spin_lock_irqsave(&ch->spinlock, flags);
1272 if (!list_empty(&ch->free_list)) {
1273 ioctx = list_first_entry(&ch->free_list,
1274 struct srpt_send_ioctx, free_list);
1275 list_del(&ioctx->free_list);
1276 }
1277 spin_unlock_irqrestore(&ch->spinlock, flags);
1278
1279 if (!ioctx)
1280 return ioctx;
1281
1282 BUG_ON(ioctx->ch != ch);
a42d985b
BVA		 1283 spin_lock_init(&ioctx->spinlock);
1284 ioctx->state = SRPT_STATE_NEW;
1285 ioctx->n_rbuf = 0;
1286 ioctx->rbufs = NULL;
1287 ioctx->n_rdma = 0;
59fae4de
CH		 1288 ioctx->n_rdma_wrs = 0;
1289 ioctx->rdma_wrs = NULL;
a42d985b
BVA		 1290 ioctx->mapped_sg_count = 0;
1291 init_completion(&ioctx->tx_done);
1292 ioctx->queue_status_only = false;
1293 /*
1294 * transport_init_se_cmd() does not initialize all fields, so do it
1295 * here.
1296 */
1297 memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
1298 memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
1299
1300 return ioctx;
1301}
1302
a42d985b
BVA		 1303/**
1304 * srpt_abort_cmd() - Abort a SCSI command.
1305 * @ioctx: I/O context associated with the SCSI command.
1306 * @context: Preferred execution context.
1307 */
1308static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
1309{
1310 enum srpt_command_state state;
1311 unsigned long flags;
1312
1313 BUG_ON(!ioctx);
1314
1315 /*
1316 * If the command is in a state where the target core is waiting for
49f40163 1317 * the ib_srpt driver, change the state to the next state.
a42d985b
BVA		 1318 */
1319
1320 spin_lock_irqsave(&ioctx->spinlock, flags);
1321 state = ioctx->state;
1322 switch (state) {
1323 case SRPT_STATE_NEED_DATA:
1324 ioctx->state = SRPT_STATE_DATA_IN;
1325 break;
a42d985b
BVA		 1326 case SRPT_STATE_CMD_RSP_SENT:
1327 case SRPT_STATE_MGMT_RSP_SENT:
1328 ioctx->state = SRPT_STATE_DONE;
1329 break;
1330 default:
49f40163
BVA		 1331 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1332 __func__, state);
a42d985b
BVA		 1333 break;
1334 }
1335 spin_unlock_irqrestore(&ioctx->spinlock, flags);
1336
a42d985b 1337 pr_debug("Aborting cmd with state %d and tag %lld\n", state,
649ee054 1338 ioctx->cmd.tag);
a42d985b
BVA		 1339
1340 switch (state) {
1341 case SRPT_STATE_NEW:
1342 case SRPT_STATE_DATA_IN:
1343 case SRPT_STATE_MGMT:
49f40163 1344 case SRPT_STATE_DONE:
a42d985b
BVA		 1345 /*
1346 * Do nothing - defer abort processing until
1347 * srpt_queue_response() is invoked.
1348 */
a42d985b
BVA		 1349 break;
1350 case SRPT_STATE_NEED_DATA:
49f40163
BVA		 1351 pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);
1352 transport_generic_request_failure(&ioctx->cmd,
1353 TCM_CHECK_CONDITION_ABORT_CMD);
a42d985b
BVA		 1354 break;
1355 case SRPT_STATE_CMD_RSP_SENT:
1356 /*
1357 * SRP_RSP sending failed or the SRP_RSP send completion has
1358 * not been received in time.
1359 */
1360 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
49f40163 1361 transport_generic_free_cmd(&ioctx->cmd, 0);
a42d985b
BVA		 1362 break;
1363 case SRPT_STATE_MGMT_RSP_SENT:
49f40163 1364 transport_generic_free_cmd(&ioctx->cmd, 0);
a42d985b
BVA		 1365 break;
1366 default:
532ec6f1 1367 WARN(1, "Unexpected command state (%d)", state);
a42d985b
BVA		 1368 break;
1369 }
1370
a42d985b
BVA		 1371 return state;
1372}
1373
1374/**
e672a47f
CH		 1375 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1376 * the data that has been transferred via IB RDMA had to be postponed until the
142ad5db 1377 * check_stop_free() callback. None of this is necessary anymore and needs to
e672a47f 1378 * be cleaned up.
a42d985b 1379 */
59fae4de 1380static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
a42d985b 1381{
59fae4de
CH		 1382 struct srpt_rdma_ch *ch = cq->cq_context;
1383 struct srpt_send_ioctx *ioctx =
19f57298 1384 container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
59fae4de 1385
a42d985b
BVA		 1386 WARN_ON(ioctx->n_rdma <= 0);
1387 atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
1388
59fae4de
CH		 1389 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1390 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1391 ioctx, wc->status);
1392 srpt_abort_cmd(ioctx);
1393 return;
a42d985b 1394 }
59fae4de
CH		 1395
1396 if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
1397 SRPT_STATE_DATA_IN))
1398 target_execute_cmd(&ioctx->cmd);
1399 else
1400 pr_err("%s[%d]: wrong state = %d\n", __func__,
1401 __LINE__, srpt_get_cmd_state(ioctx));
a42d985b
BVA		 1402}
1403
59fae4de 1404static void srpt_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
a42d985b 1405{
59fae4de 1406 struct srpt_send_ioctx *ioctx =
19f57298 1407 container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
a42d985b 1408
59fae4de 1409 if (unlikely(wc->status != IB_WC_SUCCESS)) {
49f40163
BVA		 1410 /*
1411 * Note: if an RDMA write error completion is received that
1412 * means that a SEND also has been posted. Defer further
1413 * processing of the associated command until the send error
1414 * completion has been received.
1415 */
59fae4de
CH		 1416 pr_info("RDMA_WRITE for ioctx 0x%p failed with status %d\n",
1417 ioctx, wc->status);
a42d985b
BVA		 1418 }
1419}
1420
1421/**
1422 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1423 * @ch: RDMA channel through which the request has been received.
1424 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1425 * be built in the buffer ioctx->buf points at and hence this function will
1426 * overwrite the request data.
1427 * @tag: tag of the request for which this response is being generated.
1428 * @status: value for the STATUS field of the SRP_RSP information unit.
1429 *
1430 * Returns the size in bytes of the SRP_RSP response.
1431 *
1432 * An SRP_RSP response contains a SCSI status or service response. See also
1433 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1434 * response. See also SPC-2 for more information about sense data.
1435 */
1436static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
1437 struct srpt_send_ioctx *ioctx, u64 tag,
1438 int status)
1439{
1440 struct srp_rsp *srp_rsp;
1441 const u8 *sense_data;
1442 int sense_data_len, max_sense_len;
1443
1444 /*
1445 * The lowest bit of all SAM-3 status codes is zero (see also
1446 * paragraph 5.3 in SAM-3).
1447 */
1448 WARN_ON(status & 1);
1449
1450 srp_rsp = ioctx->ioctx.buf;
1451 BUG_ON(!srp_rsp);
1452
1453 sense_data = ioctx->sense_data;
1454 sense_data_len = ioctx->cmd.scsi_sense_length;
1455 WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
1456
9d2aa2b4 1457 memset(srp_rsp, 0, sizeof(*srp_rsp));
a42d985b
BVA		 1458 srp_rsp->opcode = SRP_RSP;
1459 srp_rsp->req_lim_delta =
b356c1c1 1460 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
a42d985b
BVA		 1461 srp_rsp->tag = tag;
1462 srp_rsp->status = status;
1463
1464 if (sense_data_len) {
1465 BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
1466 max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
1467 if (sense_data_len > max_sense_len) {
9f5d32af
DL		 1468 pr_warn("truncated sense data from %d to %d"
1469 " bytes\n", sense_data_len, max_sense_len);
a42d985b
BVA		 1470 sense_data_len = max_sense_len;
1471 }
1472
1473 srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
1474 srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
1475 memcpy(srp_rsp + 1, sense_data, sense_data_len);
1476 }
1477
1478 return sizeof(*srp_rsp) + sense_data_len;
1479}
1480
1481/**
1482 * srpt_build_tskmgmt_rsp() - Build a task management response.
1483 * @ch: RDMA channel through which the request has been received.
1484 * @ioctx: I/O context in which the SRP_RSP response will be built.
1485 * @rsp_code: RSP_CODE that will be stored in the response.
1486 * @tag: Tag of the request for which this response is being generated.
1487 *
1488 * Returns the size in bytes of the SRP_RSP response.
1489 *
1490 * An SRP_RSP response contains a SCSI status or service response. See also
1491 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1492 * response.
1493 */
1494static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
1495 struct srpt_send_ioctx *ioctx,
1496 u8 rsp_code, u64 tag)
1497{
1498 struct srp_rsp *srp_rsp;
1499 int resp_data_len;
1500 int resp_len;
1501
c807f643 1502 resp_data_len = 4;
a42d985b
BVA		 1503 resp_len = sizeof(*srp_rsp) + resp_data_len;
1504
1505 srp_rsp = ioctx->ioctx.buf;
1506 BUG_ON(!srp_rsp);
9d2aa2b4 1507 memset(srp_rsp, 0, sizeof(*srp_rsp));
a42d985b
BVA		 1508
1509 srp_rsp->opcode = SRP_RSP;
b356c1c1
VT		 1510 srp_rsp->req_lim_delta =
1511 cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
a42d985b
BVA		 1512 srp_rsp->tag = tag;
1513
c807f643
JW		 1514 srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
1515 srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
1516 srp_rsp->data[3] = rsp_code;
a42d985b
BVA		 1517
1518 return resp_len;
1519}
1520
a42d985b
BVA		 1521static int srpt_check_stop_free(struct se_cmd *cmd)
1522{
9474b043
NB		 1523 struct srpt_send_ioctx *ioctx = container_of(cmd,
1524 struct srpt_send_ioctx, cmd);
a42d985b 1525
afc16604 1526 return target_put_sess_cmd(&ioctx->cmd);
a42d985b
BVA		 1527}
1528
1529/**
1530 * srpt_handle_cmd() - Process SRP_CMD.
1531 */
2c7f37ff
BVA		 1532static void srpt_handle_cmd(struct srpt_rdma_ch *ch,
1533 struct srpt_recv_ioctx *recv_ioctx,
1534 struct srpt_send_ioctx *send_ioctx)
a42d985b
BVA		 1535{
1536 struct se_cmd *cmd;
1537 struct srp_cmd *srp_cmd;
a42d985b
BVA		 1538 u64 data_len;
1539 enum dma_data_direction dir;
9474b043 1540 int rc;
a42d985b
BVA		 1541
1542 BUG_ON(!send_ioctx);
1543
1544 srp_cmd = recv_ioctx->ioctx.buf;
a42d985b 1545 cmd = &send_ioctx->cmd;
649ee054 1546 cmd->tag = srp_cmd->tag;
a42d985b
BVA		 1547
1548 switch (srp_cmd->task_attr) {
1549 case SRP_CMD_SIMPLE_Q:
68d81f40 1550 cmd->sam_task_attr = TCM_SIMPLE_TAG;
a42d985b
BVA		 1551 break;
1552 case SRP_CMD_ORDERED_Q:
1553 default:
68d81f40 1554 cmd->sam_task_attr = TCM_ORDERED_TAG;
a42d985b
BVA		 1555 break;
1556 case SRP_CMD_HEAD_OF_Q:
68d81f40 1557 cmd->sam_task_attr = TCM_HEAD_TAG;
a42d985b
BVA		 1558 break;
1559 case SRP_CMD_ACA:
68d81f40 1560 cmd->sam_task_attr = TCM_ACA_TAG;
a42d985b
BVA		 1561 break;
1562 }
1563
de103c93 1564 if (srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len)) {
9f5d32af 1565 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
a42d985b 1566 srp_cmd->tag);
2c7f37ff 1567 goto release_ioctx;
a42d985b
BVA		 1568 }
1569
9474b043 1570 rc = target_submit_cmd(cmd, ch->sess, srp_cmd->cdb,
e1dd413c
BVA		 1571 &send_ioctx->sense_data[0],
1572 scsilun_to_int(&srp_cmd->lun), data_len,
1573 TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF);
9474b043 1574 if (rc != 0) {
2c7f37ff
BVA		 1575 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,
1576 srp_cmd->tag);
1577 goto release_ioctx;
187e70a5 1578 }
2c7f37ff 1579 return;
a42d985b 1580
2c7f37ff
BVA		 1581release_ioctx:
1582 send_ioctx->state = SRPT_STATE_DONE;
1583 srpt_release_cmd(cmd);
a42d985b
BVA		 1584}
1585
a42d985b
BVA		 1586static int srp_tmr_to_tcm(int fn)
1587{
1588 switch (fn) {
1589 case SRP_TSK_ABORT_TASK:
1590 return TMR_ABORT_TASK;
1591 case SRP_TSK_ABORT_TASK_SET:
1592 return TMR_ABORT_TASK_SET;
1593 case SRP_TSK_CLEAR_TASK_SET:
1594 return TMR_CLEAR_TASK_SET;
1595 case SRP_TSK_LUN_RESET:
1596 return TMR_LUN_RESET;
1597 case SRP_TSK_CLEAR_ACA:
1598 return TMR_CLEAR_ACA;
1599 default:
1600 return -1;
1601 }
1602}
1603
1604/**
1605 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1606 *
1607 * Returns 0 if and only if the request will be processed by the target core.
1608 *
1609 * For more information about SRP_TSK_MGMT information units, see also section
1610 * 6.7 in the SRP r16a document.
1611 */
1612static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
1613 struct srpt_recv_ioctx *recv_ioctx,
1614 struct srpt_send_ioctx *send_ioctx)
1615{
1616 struct srp_tsk_mgmt *srp_tsk;
1617 struct se_cmd *cmd;
3e4f5748 1618 struct se_session *sess = ch->sess;
a42d985b 1619 int tcm_tmr;
3e4f5748 1620 int rc;
a42d985b
BVA		 1621
1622 BUG_ON(!send_ioctx);
1623
1624 srp_tsk = recv_ioctx->ioctx.buf;
1625 cmd = &send_ioctx->cmd;
1626
1627 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1628 " cm_id %p sess %p\n", srp_tsk->tsk_mgmt_func,
1629 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
1630
1631 srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
649ee054 1632 send_ioctx->cmd.tag = srp_tsk->tag;
a42d985b 1633 tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
e1dd413c
BVA		 1634 rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,
1635 scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,
1636 GFP_KERNEL, srp_tsk->task_tag,
1637 TARGET_SCF_ACK_KREF);
3e4f5748
NB		 1638 if (rc != 0) {
1639 send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
de103c93 1640 goto fail;
a42d985b 1641 }
de103c93
CH		 1642 return;
1643fail:
de103c93 1644 transport_send_check_condition_and_sense(cmd, 0, 0); // XXX:
a42d985b
BVA		 1645}
1646
1647/**
1648 * srpt_handle_new_iu() - Process a newly received information unit.
1649 * @ch: RDMA channel through which the information unit has been received.
1650 * @ioctx: SRPT I/O context associated with the information unit.
1651 */
1652static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
1653 struct srpt_recv_ioctx *recv_ioctx,
1654 struct srpt_send_ioctx *send_ioctx)
1655{
1656 struct srp_cmd *srp_cmd;
a42d985b
BVA		 1657
1658 BUG_ON(!ch);
1659 BUG_ON(!recv_ioctx);
1660
1661 ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
1662 recv_ioctx->ioctx.dma, srp_max_req_size,
1663 DMA_FROM_DEVICE);
1664
33912d73 1665 if (unlikely(ch->state == CH_CONNECTING)) {
a42d985b
BVA		 1666 list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
1667 goto out;
1668 }
1669
33912d73 1670 if (unlikely(ch->state != CH_LIVE))
a42d985b
BVA		 1671 goto out;
1672
1673 srp_cmd = recv_ioctx->ioctx.buf;
1674 if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
1675 if (!send_ioctx)
1676 send_ioctx = srpt_get_send_ioctx(ch);
1677 if (unlikely(!send_ioctx)) {
1678 list_add_tail(&recv_ioctx->wait_list,
1679 &ch->cmd_wait_list);
1680 goto out;
1681 }
1682 }
1683
a42d985b
BVA		 1684 switch (srp_cmd->opcode) {
1685 case SRP_CMD:
1686 srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
1687 break;
1688 case SRP_TSK_MGMT:
1689 srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
1690 break;
1691 case SRP_I_LOGOUT:
9f5d32af 1692 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
a42d985b
BVA		 1693 break;
1694 case SRP_CRED_RSP:
1695 pr_debug("received SRP_CRED_RSP\n");
1696 break;
1697 case SRP_AER_RSP:
1698 pr_debug("received SRP_AER_RSP\n");
1699 break;
1700 case SRP_RSP:
9f5d32af 1701 pr_err("Received SRP_RSP\n");
a42d985b
BVA		 1702 break;
1703 default:
9f5d32af 1704 pr_err("received IU with unknown opcode 0x%x\n",
a42d985b
BVA		 1705 srp_cmd->opcode);
1706 break;
1707 }
1708
1709 srpt_post_recv(ch->sport->sdev, recv_ioctx);
1710out:
1711 return;
1712}
1713
59fae4de 1714static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
a42d985b 1715{
59fae4de
CH		 1716 struct srpt_rdma_ch *ch = cq->cq_context;
1717 struct srpt_recv_ioctx *ioctx =
1718 container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
a42d985b 1719
a42d985b
BVA		 1720 if (wc->status == IB_WC_SUCCESS) {
1721 int req_lim;
1722
1723 req_lim = atomic_dec_return(&ch->req_lim);
1724 if (unlikely(req_lim < 0))
9f5d32af 1725 pr_err("req_lim = %d < 0\n", req_lim);
a42d985b
BVA		 1726 srpt_handle_new_iu(ch, ioctx, NULL);
1727 } else {
59fae4de
CH		 1728 pr_info("receiving failed for ioctx %p with status %d\n",
1729 ioctx, wc->status);
a42d985b
BVA		 1730 }
1731}
1732
1733/**
a42d985b
BVA		 1734 * Note: Although this has not yet been observed during tests, at least in
1735 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1736 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1737 * value in each response is set to one, and it is possible that this response
1738 * makes the initiator send a new request before the send completion for that
1739 * response has been processed. This could e.g. happen if the call to
1740 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1741 * if IB retransmission causes generation of the send completion to be
1742 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1743 * are queued on cmd_wait_list. The code below processes these delayed
1744 * requests one at a time.
1745 */
59fae4de 1746static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
a42d985b 1747{
59fae4de
CH		 1748 struct srpt_rdma_ch *ch = cq->cq_context;
1749 struct srpt_send_ioctx *ioctx =
1750 container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
1751 enum srpt_command_state state;
a42d985b 1752
59fae4de
CH		 1753 state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
1754
1755 WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
1756 state != SRPT_STATE_MGMT_RSP_SENT);
1757
1758 atomic_inc(&ch->sq_wr_avail);
1759
49f40163 1760 if (wc->status != IB_WC_SUCCESS)
59fae4de
CH		 1761 pr_info("sending response for ioctx 0x%p failed"
1762 " with status %d\n", ioctx, wc->status);
1763
59fae4de
CH		 1764 if (state != SRPT_STATE_DONE) {
1765 srpt_unmap_sg_to_ib_sge(ch, ioctx);
1766 transport_generic_free_cmd(&ioctx->cmd, 0);
a42d985b 1767 } else {
59fae4de
CH		 1768 pr_err("IB completion has been received too late for"
1769 " wr_id = %u.\n", ioctx->ioctx.index);
a42d985b
BVA		 1770 }
1771
59fae4de 1772 while (!list_empty(&ch->cmd_wait_list) &&
33912d73 1773 ch->state == CH_LIVE &&
59fae4de 1774 (ioctx = srpt_get_send_ioctx(ch)) != NULL) {
a42d985b
BVA		 1775 struct srpt_recv_ioctx *recv_ioctx;
1776
1777 recv_ioctx = list_first_entry(&ch->cmd_wait_list,
1778 struct srpt_recv_ioctx,
1779 wait_list);
1780 list_del(&recv_ioctx->wait_list);
59fae4de 1781 srpt_handle_new_iu(ch, recv_ioctx, ioctx);
a42d985b
BVA		 1782 }
1783}
1784
a42d985b
BVA		 1785/**
1786 * srpt_create_ch_ib() - Create receive and send completion queues.
1787 */
1788static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
1789{
1790 struct ib_qp_init_attr *qp_init;
1791 struct srpt_port *sport = ch->sport;
1792 struct srpt_device *sdev = sport->sdev;
1793 u32 srp_sq_size = sport->port_attrib.srp_sq_size;
1794 int ret;
1795
1796 WARN_ON(ch->rq_size < 1);
1797
1798 ret = -ENOMEM;
9d2aa2b4 1799 qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);
a42d985b
BVA		 1800 if (!qp_init)
1801 goto out;
1802
ab477c1f 1803retry:
59fae4de
CH		 1804 ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + srp_sq_size,
1805 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE);
a42d985b
BVA		 1806 if (IS_ERR(ch->cq)) {
1807 ret = PTR_ERR(ch->cq);
9f5d32af 1808 pr_err("failed to create CQ cqe= %d ret= %d\n",
a42d985b
BVA		 1809 ch->rq_size + srp_sq_size, ret);
1810 goto out;
1811 }
1812
1813 qp_init->qp_context = (void *)ch;
1814 qp_init->event_handler
1815 = (void(*)(struct ib_event *, void*))srpt_qp_event;
1816 qp_init->send_cq = ch->cq;
1817 qp_init->recv_cq = ch->cq;
1818 qp_init->srq = sdev->srq;
1819 qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
1820 qp_init->qp_type = IB_QPT_RC;
1821 qp_init->cap.max_send_wr = srp_sq_size;
1822 qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE;
1823
1824 ch->qp = ib_create_qp(sdev->pd, qp_init);
1825 if (IS_ERR(ch->qp)) {
1826 ret = PTR_ERR(ch->qp);
ab477c1f
BVA		 1827 if (ret == -ENOMEM) {
1828 srp_sq_size /= 2;
1829 if (srp_sq_size >= MIN_SRPT_SQ_SIZE) {
1830 ib_destroy_cq(ch->cq);
1831 goto retry;
1832 }
1833 }
9f5d32af 1834 pr_err("failed to create_qp ret= %d\n", ret);
a42d985b
BVA		 1835 goto err_destroy_cq;
1836 }
1837
1838 atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
1839
1840 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1841 __func__, ch->cq->cqe, qp_init->cap.max_send_sge,
1842 qp_init->cap.max_send_wr, ch->cm_id);
1843
1844 ret = srpt_init_ch_qp(ch, ch->qp);
1845 if (ret)
1846 goto err_destroy_qp;
1847
a42d985b
BVA		 1848out:
1849 kfree(qp_init);
1850 return ret;
1851
1852err_destroy_qp:
1853 ib_destroy_qp(ch->qp);
1854err_destroy_cq:
59fae4de 1855 ib_free_cq(ch->cq);
a42d985b
BVA		 1856 goto out;
1857}
1858
1859static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
1860{
a42d985b 1861 ib_destroy_qp(ch->qp);
59fae4de 1862 ib_free_cq(ch->cq);
a42d985b
BVA		 1863}
1864
1865/**
aaf45bd8 1866 * srpt_close_ch() - Close an RDMA channel.
a42d985b 1867 *
aaf45bd8
BVA		 1868 * Make sure all resources associated with the channel will be deallocated at
1869 * an appropriate time.
a42d985b 1870 *
aaf45bd8
BVA		 1871 * Returns true if and only if the channel state has been modified into
1872 * CH_DRAINING.
a42d985b 1873 */
aaf45bd8 1874static bool srpt_close_ch(struct srpt_rdma_ch *ch)
a42d985b 1875{
aaf45bd8 1876 int ret;
a42d985b 1877
aaf45bd8
BVA		 1878 if (!srpt_set_ch_state(ch, CH_DRAINING)) {
1879 pr_debug("%s-%d: already closed\n", ch->sess_name,
1880 ch->qp->qp_num);
1881 return false;
a42d985b 1882 }
a42d985b 1883
aaf45bd8 1884 kref_get(&ch->kref);
a42d985b 1885
aaf45bd8
BVA		 1886 ret = srpt_ch_qp_err(ch);
1887 if (ret < 0)
1888 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1889 ch->sess_name, ch->qp->qp_num, ret);
a42d985b 1890
aaf45bd8
BVA		 1891 pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
1892 ch->qp->qp_num);
1893 ret = srpt_zerolength_write(ch);
1894 if (ret < 0) {
1895 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1896 ch->sess_name, ch->qp->qp_num, ret);
1897 if (srpt_set_ch_state(ch, CH_DISCONNECTED))
1898 schedule_work(&ch->release_work);
1899 else
1900 WARN_ON_ONCE(true);
1901 }
a42d985b 1902
aaf45bd8
BVA		 1903 kref_put(&ch->kref, srpt_free_ch);
1904
1905 return true;
1d19f780
NB		 1906}
1907
aaf45bd8
BVA		 1908/*
1909 * Change the channel state into CH_DISCONNECTING. If a channel has not yet
1910 * reached the connected state, close it. If a channel is in the connected
1911 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
1912 * the responsibility of the caller to ensure that this function is not
1913 * invoked concurrently with the code that accepts a connection. This means
1914 * that this function must either be invoked from inside a CM callback
1915 * function or that it must be invoked with the srpt_port.mutex held.
a42d985b 1916 */
aaf45bd8 1917static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
a42d985b 1918{
a42d985b 1919 int ret;
a42d985b 1920
aaf45bd8
BVA		 1921 if (!srpt_set_ch_state(ch, CH_DISCONNECTING))
1922 return -ENOTCONN;
a42d985b 1923
aaf45bd8
BVA		 1924 ret = ib_send_cm_dreq(ch->cm_id, NULL, 0);
1925 if (ret < 0)
1926 ret = ib_send_cm_drep(ch->cm_id, NULL, 0);
a42d985b 1927
aaf45bd8
BVA		 1928 if (ret < 0 && srpt_close_ch(ch))
1929 ret = 0;
1d19f780 1930
aaf45bd8
BVA		 1931 return ret;
1932}
1933
1934static void __srpt_close_all_ch(struct srpt_device *sdev)
1935{
1936 struct srpt_rdma_ch *ch;
1937
1938 lockdep_assert_held(&sdev->mutex);
1939
1940 list_for_each_entry(ch, &sdev->rch_list, list) {
1941 if (srpt_disconnect_ch(ch) >= 0)
1942 pr_info("Closing channel %s-%d because target %s has been disabled\n",
1943 ch->sess_name, ch->qp->qp_num,
1944 sdev->device->name);
1945 srpt_close_ch(ch);
a42d985b
BVA		 1946 }
1947}
1948
a42d985b 1949/**
aaf45bd8 1950 * srpt_shutdown_session() - Whether or not a session may be shut down.
a42d985b 1951 */
aaf45bd8 1952static int srpt_shutdown_session(struct se_session *se_sess)
a42d985b 1953{
aaf45bd8
BVA		 1954 return 1;
1955}
1956
1957static void srpt_free_ch(struct kref *kref)
1958{
1959 struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);
1960
1961 kfree(ch);
a42d985b
BVA		 1962}
1963
1964static void srpt_release_channel_work(struct work_struct *w)
1965{
1966 struct srpt_rdma_ch *ch;
1967 struct srpt_device *sdev;
9474b043 1968 struct se_session *se_sess;
a42d985b
BVA		 1969
1970 ch = container_of(w, struct srpt_rdma_ch, release_work);
f108f0f6
BVA		 1971 pr_debug("%s: %s-%d; release_done = %p\n", __func__, ch->sess_name,
1972 ch->qp->qp_num, ch->release_done);
a42d985b
BVA		 1973
1974 sdev = ch->sport->sdev;
1975 BUG_ON(!sdev);
1976
9474b043
NB		 1977 se_sess = ch->sess;
1978 BUG_ON(!se_sess);
1979
88936259 1980 target_sess_cmd_list_set_waiting(se_sess);
be646c2d 1981 target_wait_for_sess_cmds(se_sess);
9474b043
NB		 1982
1983 transport_deregister_session_configfs(se_sess);
1984 transport_deregister_session(se_sess);
a42d985b
BVA		 1985 ch->sess = NULL;
1986
0b41d6ca
NB		 1987 ib_destroy_cm_id(ch->cm_id);
1988
a42d985b
BVA		 1989 srpt_destroy_ch_ib(ch);
1990
1991 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
1992 ch->sport->sdev, ch->rq_size,
1993 ch->rsp_size, DMA_TO_DEVICE);
1994
8628991f 1995 mutex_lock(&sdev->mutex);
f108f0f6 1996 list_del_init(&ch->list);
a42d985b
BVA		 1997 if (ch->release_done)
1998 complete(ch->release_done);
8628991f 1999 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 2000
2001 wake_up(&sdev->ch_releaseQ);
2002
aaf45bd8 2003 kref_put(&ch->kref, srpt_free_ch);
a42d985b
BVA		 2004}
2005
a42d985b
BVA		 2006/**
2007 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
2008 *
2009 * Ownership of the cm_id is transferred to the target session if this
2010 * functions returns zero. Otherwise the caller remains the owner of cm_id.
2011 */
2012static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
2013 struct ib_cm_req_event_param *param,
2014 void *private_data)
2015{
2016 struct srpt_device *sdev = cm_id->context;
2017 struct srpt_port *sport = &sdev->port[param->port - 1];
2018 struct srp_login_req *req;
2019 struct srp_login_rsp *rsp;
2020 struct srp_login_rej *rej;
2021 struct ib_cm_rep_param *rep_param;
2022 struct srpt_rdma_ch *ch, *tmp_ch;
f246c941 2023 struct se_node_acl *se_acl;
a42d985b 2024 u32 it_iu_len;
f246c941
NB		 2025 int i, ret = 0;
2026 unsigned char *p;
a42d985b
BVA		 2027
2028 WARN_ON_ONCE(irqs_disabled());
2029
2030 if (WARN_ON(!sdev || !private_data))
2031 return -EINVAL;
2032
2033 req = (struct srp_login_req *)private_data;
2034
2035 it_iu_len = be32_to_cpu(req->req_it_iu_len);
2036
9f5d32af
DL		 2037 pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
2038 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
2039 " (guid=0x%llx:0x%llx)\n",
2040 be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
2041 be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
2042 be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
2043 be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
2044 it_iu_len,
2045 param->port,
2046 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
2047 be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
a42d985b 2048
9d2aa2b4
BVA		 2049 rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
2050 rej = kzalloc(sizeof(*rej), GFP_KERNEL);
2051 rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);
a42d985b
BVA		 2052
2053 if (!rsp || !rej || !rep_param) {
2054 ret = -ENOMEM;
2055 goto out;
2056 }
2057
2058 if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
b356c1c1
VT		 2059 rej->reason = cpu_to_be32(
2060 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
a42d985b 2061 ret = -EINVAL;
9f5d32af 2062 pr_err("rejected SRP_LOGIN_REQ because its"
a42d985b
BVA		 2063 " length (%d bytes) is out of range (%d .. %d)\n",
2064 it_iu_len, 64, srp_max_req_size);
2065 goto reject;
2066 }
2067
2068 if (!sport->enabled) {
b356c1c1
VT		 2069 rej->reason = cpu_to_be32(
2070 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
a42d985b 2071 ret = -EINVAL;
9f5d32af 2072 pr_err("rejected SRP_LOGIN_REQ because the target port"
a42d985b
BVA		 2073 " has not yet been enabled\n");
2074 goto reject;
2075 }
2076
2077 if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
2078 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
2079
8628991f 2080 mutex_lock(&sdev->mutex);
a42d985b
BVA		 2081
2082 list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
2083 if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
2084 && !memcmp(ch->t_port_id, req->target_port_id, 16)
2085 && param->port == ch->sport->port
2086 && param->listen_id == ch->sport->sdev->cm_id
2087 && ch->cm_id) {
aaf45bd8 2088 if (srpt_disconnect_ch(ch) < 0)
a42d985b 2089 continue;
aaf45bd8
BVA		 2090 pr_info("Relogin - closed existing channel %s\n",
2091 ch->sess_name);
a42d985b
BVA		 2092 rsp->rsp_flags =
2093 SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
2094 }
2095 }
2096
8628991f 2097 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 2098
2099 } else
2100 rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
2101
2102 if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
2103 || *(__be64 *)(req->target_port_id + 8) !=
2104 cpu_to_be64(srpt_service_guid)) {
b356c1c1
VT		 2105 rej->reason = cpu_to_be32(
2106 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
a42d985b 2107 ret = -ENOMEM;
9f5d32af 2108 pr_err("rejected SRP_LOGIN_REQ because it"
a42d985b
BVA		 2109 " has an invalid target port identifier.\n");
2110 goto reject;
2111 }
2112
9d2aa2b4 2113 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
a42d985b 2114 if (!ch) {
b356c1c1
VT		 2115 rej->reason = cpu_to_be32(
2116 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
9f5d32af 2117 pr_err("rejected SRP_LOGIN_REQ because no memory.\n");
a42d985b
BVA		 2118 ret = -ENOMEM;
2119 goto reject;
2120 }
2121
aaf45bd8
BVA		 2122 kref_init(&ch->kref);
2123 ch->zw_cqe.done = srpt_zerolength_write_done;
a42d985b
BVA		 2124 INIT_WORK(&ch->release_work, srpt_release_channel_work);
2125 memcpy(ch->i_port_id, req->initiator_port_id, 16);
2126 memcpy(ch->t_port_id, req->target_port_id, 16);
2127 ch->sport = &sdev->port[param->port - 1];
2128 ch->cm_id = cm_id;
2739b592 2129 cm_id->context = ch;
a42d985b
BVA		 2130 /*
2131 * Avoid QUEUE_FULL conditions by limiting the number of buffers used
2132 * for the SRP protocol to the command queue size.
2133 */
2134 ch->rq_size = SRPT_RQ_SIZE;
2135 spin_lock_init(&ch->spinlock);
2136 ch->state = CH_CONNECTING;
2137 INIT_LIST_HEAD(&ch->cmd_wait_list);
2138 ch->rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
2139
2140 ch->ioctx_ring = (struct srpt_send_ioctx **)
2141 srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
2142 sizeof(*ch->ioctx_ring[0]),
2143 ch->rsp_size, DMA_TO_DEVICE);
2144 if (!ch->ioctx_ring)
2145 goto free_ch;
2146
2147 INIT_LIST_HEAD(&ch->free_list);
2148 for (i = 0; i < ch->rq_size; i++) {
2149 ch->ioctx_ring[i]->ch = ch;
2150 list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
2151 }
2152
2153 ret = srpt_create_ch_ib(ch);
2154 if (ret) {
b356c1c1
VT		 2155 rej->reason = cpu_to_be32(
2156 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
9f5d32af 2157 pr_err("rejected SRP_LOGIN_REQ because creating"
a42d985b
BVA		 2158 " a new RDMA channel failed.\n");
2159 goto free_ring;
2160 }
2161
2162 ret = srpt_ch_qp_rtr(ch, ch->qp);
2163 if (ret) {
b356c1c1 2164 rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
9f5d32af 2165 pr_err("rejected SRP_LOGIN_REQ because enabling"
a42d985b
BVA		 2166 " RTR failed (error code = %d)\n", ret);
2167 goto destroy_ib;
2168 }
f246c941 2169
a42d985b 2170 /*
f246c941
NB		 2171 * Use the initator port identifier as the session name, when
2172 * checking against se_node_acl->initiatorname[] this can be
2173 * with or without preceeding '0x'.
a42d985b
BVA		 2174 */
2175 snprintf(ch->sess_name, sizeof(ch->sess_name), "0x%016llx%016llx",
2176 be64_to_cpu(*(__be64 *)ch->i_port_id),
2177 be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
2178
2179 pr_debug("registering session %s\n", ch->sess_name);
f246c941 2180 p = &ch->sess_name[0];
a42d985b 2181
f246c941
NB		 2182 ch->sess = transport_init_session(TARGET_PROT_NORMAL);
2183 if (IS_ERR(ch->sess)) {
b356c1c1 2184 rej->reason = cpu_to_be32(
f246c941
NB		 2185 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
2186 pr_debug("Failed to create session\n");
a42d985b
BVA		 2187 goto destroy_ib;
2188 }
2189
f246c941
NB		 2190try_again:
2191 se_acl = core_tpg_get_initiator_node_acl(&sport->port_tpg_1, p);
2192 if (!se_acl) {
2193 pr_info("Rejected login because no ACL has been"
2194 " configured yet for initiator %s.\n", ch->sess_name);
2195 /*
2196 * XXX: Hack to retry of ch->i_port_id without leading '0x'
2197 */
2198 if (p == &ch->sess_name[0]) {
2199 p += 2;
2200 goto try_again;
2201 }
b356c1c1 2202 rej->reason = cpu_to_be32(
f246c941
NB		 2203 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
2204 transport_free_session(ch->sess);
2205 goto destroy_ib;
a42d985b 2206 }
f246c941
NB		 2207 ch->sess->se_node_acl = se_acl;
2208
2209 transport_register_session(&sport->port_tpg_1, se_acl, ch->sess, ch);
a42d985b
BVA		 2210
2211 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch->sess,
2212 ch->sess_name, ch->cm_id);
2213
2214 /* create srp_login_response */
2215 rsp->opcode = SRP_LOGIN_RSP;
2216 rsp->tag = req->tag;
2217 rsp->max_it_iu_len = req->req_it_iu_len;
2218 rsp->max_ti_iu_len = req->req_it_iu_len;
2219 ch->max_ti_iu_len = it_iu_len;
b356c1c1
VT		 2220 rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2221 | SRP_BUF_FORMAT_INDIRECT);
a42d985b
BVA		 2222 rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
2223 atomic_set(&ch->req_lim, ch->rq_size);
2224 atomic_set(&ch->req_lim_delta, 0);
2225
2226 /* create cm reply */
2227 rep_param->qp_num = ch->qp->qp_num;
2228 rep_param->private_data = (void *)rsp;
9d2aa2b4 2229 rep_param->private_data_len = sizeof(*rsp);
a42d985b
BVA		 2230 rep_param->rnr_retry_count = 7;
2231 rep_param->flow_control = 1;
2232 rep_param->failover_accepted = 0;
2233 rep_param->srq = 1;
2234 rep_param->responder_resources = 4;
2235 rep_param->initiator_depth = 4;
2236
2237 ret = ib_send_cm_rep(cm_id, rep_param);
2238 if (ret) {
9f5d32af 2239 pr_err("sending SRP_LOGIN_REQ response failed"
a42d985b
BVA		 2240 " (error code = %d)\n", ret);
2241 goto release_channel;
2242 }
2243
8628991f 2244 mutex_lock(&sdev->mutex);
a42d985b 2245 list_add_tail(&ch->list, &sdev->rch_list);
8628991f 2246 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 2247
2248 goto out;
2249
2250release_channel:
aaf45bd8 2251 srpt_disconnect_ch(ch);
a42d985b 2252 transport_deregister_session_configfs(ch->sess);
a42d985b
BVA		 2253 transport_deregister_session(ch->sess);
2254 ch->sess = NULL;
2255
2256destroy_ib:
2257 srpt_destroy_ch_ib(ch);
2258
2259free_ring:
2260 srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
2261 ch->sport->sdev, ch->rq_size,
2262 ch->rsp_size, DMA_TO_DEVICE);
2263free_ch:
2264 kfree(ch);
2265
2266reject:
2267 rej->opcode = SRP_LOGIN_REJ;
2268 rej->tag = req->tag;
b356c1c1
VT		 2269 rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2270 | SRP_BUF_FORMAT_INDIRECT);
a42d985b
BVA		 2271
2272 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
9d2aa2b4 2273 (void *)rej, sizeof(*rej));
a42d985b
BVA		 2274
2275out:
2276 kfree(rep_param);
2277 kfree(rsp);
2278 kfree(rej);
2279
2280 return ret;
2281}
2282
2739b592
BVA		 2283static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,
2284 enum ib_cm_rej_reason reason,
2285 const u8 *private_data,
2286 u8 private_data_len)
a42d985b 2287{
c13c90ea
BVA		 2288 char *priv = NULL;
2289 int i;
2290
2291 if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,
2292 GFP_KERNEL))) {
2293 for (i = 0; i < private_data_len; i++)
2294 sprintf(priv + 3 * i, " %02x", private_data[i]);
2295 }
2296 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2297 ch->sess_name, ch->qp->qp_num, reason, private_data_len ?
2298 "; private data" : "", priv ? priv : " (?)");
2299 kfree(priv);
a42d985b
BVA		 2300}
2301
2302/**
2303 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2304 *
2305 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2306 * and that the recipient may begin transmitting (RTU = ready to use).
2307 */
2739b592 2308static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
a42d985b 2309{
a42d985b
BVA		 2310 int ret;
2311
f130c220 2312 if (srpt_set_ch_state(ch, CH_LIVE)) {
a42d985b
BVA		 2313 struct srpt_recv_ioctx *ioctx, *ioctx_tmp;
2314
2315 ret = srpt_ch_qp_rts(ch, ch->qp);
2316
2317 list_for_each_entry_safe(ioctx, ioctx_tmp, &ch->cmd_wait_list,
2318 wait_list) {
2319 list_del(&ioctx->wait_list);
2320 srpt_handle_new_iu(ch, ioctx, NULL);
2321 }
2322 if (ret)
2323 srpt_close_ch(ch);
2324 }
2325}
2326
a42d985b
BVA		 2327/**
2328 * srpt_cm_handler() - IB connection manager callback function.
2329 *
2330 * A non-zero return value will cause the caller destroy the CM ID.
2331 *
2332 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2333 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2334 * a non-zero value in any other case will trigger a race with the
2335 * ib_destroy_cm_id() call in srpt_release_channel().
2336 */
2337static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2338{
2739b592 2339 struct srpt_rdma_ch *ch = cm_id->context;
a42d985b
BVA		 2340 int ret;
2341
2342 ret = 0;
2343 switch (event->event) {
2344 case IB_CM_REQ_RECEIVED:
2345 ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
2346 event->private_data);
2347 break;
2348 case IB_CM_REJ_RECEIVED:
2739b592
BVA		 2349 srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,
2350 event->private_data,
2351 IB_CM_REJ_PRIVATE_DATA_SIZE);
a42d985b
BVA		 2352 break;
2353 case IB_CM_RTU_RECEIVED:
2354 case IB_CM_USER_ESTABLISHED:
2739b592 2355 srpt_cm_rtu_recv(ch);
a42d985b
BVA		 2356 break;
2357 case IB_CM_DREQ_RECEIVED:
aaf45bd8 2358 srpt_disconnect_ch(ch);
a42d985b
BVA		 2359 break;
2360 case IB_CM_DREP_RECEIVED:
2739b592
BVA		 2361 pr_info("Received CM DREP message for ch %s-%d.\n",
2362 ch->sess_name, ch->qp->qp_num);
aaf45bd8 2363 srpt_close_ch(ch);
a42d985b
BVA		 2364 break;
2365 case IB_CM_TIMEWAIT_EXIT:
2739b592
BVA		 2366 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2367 ch->sess_name, ch->qp->qp_num);
aaf45bd8 2368 srpt_close_ch(ch);
a42d985b
BVA		 2369 break;
2370 case IB_CM_REP_ERROR:
2739b592
BVA		 2371 pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
2372 ch->qp->qp_num);
a42d985b
BVA		 2373 break;
2374 case IB_CM_DREQ_ERROR:
1e20a2a5 2375 pr_info("Received CM DREQ ERROR event.\n");
a42d985b
BVA		 2376 break;
2377 case IB_CM_MRA_RECEIVED:
1e20a2a5 2378 pr_info("Received CM MRA event\n");
a42d985b
BVA		 2379 break;
2380 default:
1e20a2a5 2381 pr_err("received unrecognized CM event %d\n", event->event);
a42d985b
BVA		 2382 break;
2383 }
2384
2385 return ret;
2386}
2387
2388/**
2389 * srpt_perform_rdmas() - Perform IB RDMA.
2390 *
2391 * Returns zero upon success or a negative number upon failure.
2392 */
2393static int srpt_perform_rdmas(struct srpt_rdma_ch *ch,
2394 struct srpt_send_ioctx *ioctx)
2395{
a42d985b 2396 struct ib_send_wr *bad_wr;
59fae4de 2397 int sq_wr_avail, ret, i;
a42d985b
BVA		 2398 enum dma_data_direction dir;
2399 const int n_rdma = ioctx->n_rdma;
2400
2401 dir = ioctx->cmd.data_direction;
2402 if (dir == DMA_TO_DEVICE) {
2403 /* write */
2404 ret = -ENOMEM;
2405 sq_wr_avail = atomic_sub_return(n_rdma, &ch->sq_wr_avail);
2406 if (sq_wr_avail < 0) {
9f5d32af
DL		 2407 pr_warn("IB send queue full (needed %d)\n",
2408 n_rdma);
a42d985b
BVA		 2409 goto out;
2410 }
2411 }
2412
59fae4de
CH		 2413 for (i = 0; i < n_rdma; i++) {
2414 struct ib_send_wr *wr = &ioctx->rdma_wrs[i].wr;
a42d985b 2415
59fae4de
CH		 2416 wr->opcode = (dir == DMA_FROM_DEVICE) ?
2417 IB_WR_RDMA_WRITE : IB_WR_RDMA_READ;
a42d985b 2418
59fae4de
CH		 2419 if (i == n_rdma - 1) {
2420 /* only get completion event for the last rdma read */
2421 if (dir == DMA_TO_DEVICE) {
2422 wr->send_flags = IB_SEND_SIGNALED;
2423 ioctx->rdma_cqe.done = srpt_rdma_read_done;
2424 } else {
2425 ioctx->rdma_cqe.done = srpt_rdma_write_done;
2426 }
2427 wr->wr_cqe = &ioctx->rdma_cqe;
2428 wr->next = NULL;
2429 } else {
2430 wr->wr_cqe = NULL;
2431 wr->next = &ioctx->rdma_wrs[i + 1].wr;
2432 }
a42d985b
BVA		 2433 }
2434
59fae4de 2435 ret = ib_post_send(ch->qp, &ioctx->rdma_wrs->wr, &bad_wr);
a42d985b 2436 if (ret)
9f5d32af 2437 pr_err("%s[%d]: ib_post_send() returned %d for %d/%d\n",
a42d985b 2438 __func__, __LINE__, ret, i, n_rdma);
a42d985b
BVA		 2439out:
2440 if (unlikely(dir == DMA_TO_DEVICE && ret < 0))
2441 atomic_add(n_rdma, &ch->sq_wr_avail);
2442 return ret;
2443}
2444
2445/**
2446 * srpt_xfer_data() - Start data transfer from initiator to target.
2447 */
2448static int srpt_xfer_data(struct srpt_rdma_ch *ch,
2449 struct srpt_send_ioctx *ioctx)
2450{
2451 int ret;
2452
2453 ret = srpt_map_sg_to_ib_sge(ch, ioctx);
2454 if (ret) {
9f5d32af 2455 pr_err("%s[%d] ret=%d\n", __func__, __LINE__, ret);
a42d985b
BVA		 2456 goto out;
2457 }
2458
2459 ret = srpt_perform_rdmas(ch, ioctx);
2460 if (ret) {
2461 if (ret == -EAGAIN || ret == -ENOMEM)
9f5d32af
DL		 2462 pr_info("%s[%d] queue full -- ret=%d\n",
2463 __func__, __LINE__, ret);
a42d985b 2464 else
9f5d32af 2465 pr_err("%s[%d] fatal error -- ret=%d\n",
a42d985b
BVA		 2466 __func__, __LINE__, ret);
2467 goto out_unmap;
2468 }
2469
2470out:
2471 return ret;
2472out_unmap:
2473 srpt_unmap_sg_to_ib_sge(ch, ioctx);
2474 goto out;
2475}
2476
2477static int srpt_write_pending_status(struct se_cmd *se_cmd)
2478{
2479 struct srpt_send_ioctx *ioctx;
2480
2481 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2482 return srpt_get_cmd_state(ioctx) == SRPT_STATE_NEED_DATA;
2483}
2484
2485/*
2486 * srpt_write_pending() - Start data transfer from initiator to target (write).
2487 */
2488static int srpt_write_pending(struct se_cmd *se_cmd)
2489{
2490 struct srpt_rdma_ch *ch;
2491 struct srpt_send_ioctx *ioctx;
2492 enum srpt_command_state new_state;
a42d985b
BVA		 2493 int ret;
2494
2495 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2496
2497 new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
2498 WARN_ON(new_state == SRPT_STATE_DONE);
2499
2500 ch = ioctx->ch;
2501 BUG_ON(!ch);
2502
33912d73 2503 switch (ch->state) {
a42d985b 2504 case CH_CONNECTING:
33912d73 2505 WARN(true, "unexpected channel state %d\n", ch->state);
a42d985b
BVA		 2506 ret = -EINVAL;
2507 goto out;
2508 case CH_LIVE:
2509 break;
2510 case CH_DISCONNECTING:
2511 case CH_DRAINING:
aaf45bd8 2512 case CH_DISCONNECTED:
a42d985b 2513 pr_debug("cmd with tag %lld: channel disconnecting\n",
649ee054 2514 ioctx->cmd.tag);
a42d985b
BVA		 2515 srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
2516 ret = -EINVAL;
2517 goto out;
2518 }
2519 ret = srpt_xfer_data(ch, ioctx);
2520
2521out:
2522 return ret;
2523}
2524
2525static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
2526{
2527 switch (tcm_mgmt_status) {
2528 case TMR_FUNCTION_COMPLETE:
2529 return SRP_TSK_MGMT_SUCCESS;
2530 case TMR_FUNCTION_REJECTED:
2531 return SRP_TSK_MGMT_FUNC_NOT_SUPP;
2532 }
2533 return SRP_TSK_MGMT_FAILED;
2534}
2535
2536/**
2537 * srpt_queue_response() - Transmits the response to a SCSI command.
2538 *
2539 * Callback function called by the TCM core. Must not block since it can be
2540 * invoked on the context of the IB completion handler.
2541 */
b79fafac 2542static void srpt_queue_response(struct se_cmd *cmd)
a42d985b
BVA		 2543{
2544 struct srpt_rdma_ch *ch;
2545 struct srpt_send_ioctx *ioctx;
2546 enum srpt_command_state state;
2547 unsigned long flags;
2548 int ret;
2549 enum dma_data_direction dir;
2550 int resp_len;
2551 u8 srp_tm_status;
2552
a42d985b
BVA		 2553 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
2554 ch = ioctx->ch;
2555 BUG_ON(!ch);
2556
2557 spin_lock_irqsave(&ioctx->spinlock, flags);
2558 state = ioctx->state;
2559 switch (state) {
2560 case SRPT_STATE_NEW:
2561 case SRPT_STATE_DATA_IN:
2562 ioctx->state = SRPT_STATE_CMD_RSP_SENT;
2563 break;
2564 case SRPT_STATE_MGMT:
2565 ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
2566 break;
2567 default:
2568 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2569 ch, ioctx->ioctx.index, ioctx->state);
2570 break;
2571 }
2572 spin_unlock_irqrestore(&ioctx->spinlock, flags);
2573
2574 if (unlikely(transport_check_aborted_status(&ioctx->cmd, false)
2575 || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) {
2576 atomic_inc(&ch->req_lim_delta);
2577 srpt_abort_cmd(ioctx);
b79fafac 2578 return;
a42d985b
BVA		 2579 }
2580
2581 dir = ioctx->cmd.data_direction;
2582
2583 /* For read commands, transfer the data to the initiator. */
2584 if (dir == DMA_FROM_DEVICE && ioctx->cmd.data_length &&
2585 !ioctx->queue_status_only) {
2586 ret = srpt_xfer_data(ch, ioctx);
2587 if (ret) {
9f5d32af 2588 pr_err("xfer_data failed for tag %llu\n",
649ee054 2589 ioctx->cmd.tag);
b79fafac 2590 return;
a42d985b
BVA		 2591 }
2592 }
2593
2594 if (state != SRPT_STATE_MGMT)
649ee054 2595 resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
a42d985b
BVA		 2596 cmd->scsi_status);
2597 else {
2598 srp_tm_status
2599 = tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
2600 resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
649ee054 2601 ioctx->cmd.tag);
a42d985b
BVA		 2602 }
2603 ret = srpt_post_send(ch, ioctx, resp_len);
2604 if (ret) {
9f5d32af 2605 pr_err("sending cmd response failed for tag %llu\n",
649ee054 2606 ioctx->cmd.tag);
a42d985b
BVA		 2607 srpt_unmap_sg_to_ib_sge(ch, ioctx);
2608 srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
afc16604 2609 target_put_sess_cmd(&ioctx->cmd);
a42d985b 2610 }
b79fafac 2611}
a42d985b 2612
b79fafac
JE		 2613static int srpt_queue_data_in(struct se_cmd *cmd)
2614{
2615 srpt_queue_response(cmd);
2616 return 0;
2617}
2618
2619static void srpt_queue_tm_rsp(struct se_cmd *cmd)
2620{
2621 srpt_queue_response(cmd);
a42d985b
BVA		 2622}
2623
131e6abc
NB		 2624static void srpt_aborted_task(struct se_cmd *cmd)
2625{
2626 struct srpt_send_ioctx *ioctx = container_of(cmd,
2627 struct srpt_send_ioctx, cmd);
2628
2629 srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
2630}
2631
a42d985b
BVA		 2632static int srpt_queue_status(struct se_cmd *cmd)
2633{
2634 struct srpt_send_ioctx *ioctx;
2635
2636 ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
2637 BUG_ON(ioctx->sense_data != cmd->sense_buffer);
2638 if (cmd->se_cmd_flags &
2639 (SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
2640 WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
2641 ioctx->queue_status_only = true;
b79fafac
JE		 2642 srpt_queue_response(cmd);
2643 return 0;
a42d985b
BVA		 2644}
2645
2646static void srpt_refresh_port_work(struct work_struct *work)
2647{
2648 struct srpt_port *sport = container_of(work, struct srpt_port, work);
2649
2650 srpt_refresh_port(sport);
2651}
2652
a42d985b
BVA		 2653/**
2654 * srpt_release_sdev() - Free the channel resources associated with a target.
2655 */
2656static int srpt_release_sdev(struct srpt_device *sdev)
2657{
aaf45bd8 2658 int i, res;
a42d985b
BVA		 2659
2660 WARN_ON_ONCE(irqs_disabled());
2661
2662 BUG_ON(!sdev);
2663
8628991f 2664 mutex_lock(&sdev->mutex);
aaf45bd8
BVA		 2665 for (i = 0; i < ARRAY_SIZE(sdev->port); i++)
2666 sdev->port[i].enabled = false;
2667 __srpt_close_all_ch(sdev);
8628991f 2668 mutex_unlock(&sdev->mutex);
a42d985b
BVA		 2669
2670 res = wait_event_interruptible(sdev->ch_releaseQ,
8628991f 2671 list_empty_careful(&sdev->rch_list));
a42d985b 2672 if (res)
9f5d32af 2673 pr_err("%s: interrupted.\n", __func__);
a42d985b
BVA		 2674
2675 return 0;
2676}
2677
2678static struct srpt_port *__srpt_lookup_port(const char *name)
2679{
2680 struct ib_device *dev;
2681 struct srpt_device *sdev;
2682 struct srpt_port *sport;
2683 int i;
2684
2685 list_for_each_entry(sdev, &srpt_dev_list, list) {
2686 dev = sdev->device;
2687 if (!dev)
2688 continue;
2689
2690 for (i = 0; i < dev->phys_port_cnt; i++) {
2691 sport = &sdev->port[i];
2692
2693 if (!strcmp(sport->port_guid, name))
2694 return sport;
2695 }
2696 }
2697
2698 return NULL;
2699}
2700
2701static struct srpt_port *srpt_lookup_port(const char *name)
2702{
2703 struct srpt_port *sport;
2704
2705 spin_lock(&srpt_dev_lock);
2706 sport = __srpt_lookup_port(name);
2707 spin_unlock(&srpt_dev_lock);
2708
2709 return sport;
2710}
2711
2712/**
2713 * srpt_add_one() - Infiniband device addition callback function.
2714 */
2715static void srpt_add_one(struct ib_device *device)
2716{
2717 struct srpt_device *sdev;
2718 struct srpt_port *sport;
2719 struct ib_srq_init_attr srq_attr;
2720 int i;
2721
2722 pr_debug("device = %p, device->dma_ops = %p\n", device,
2723 device->dma_ops);
2724
9d2aa2b4 2725 sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
a42d985b
BVA		 2726 if (!sdev)
2727 goto err;
2728
2729 sdev->device = device;
2730 INIT_LIST_HEAD(&sdev->rch_list);
2731 init_waitqueue_head(&sdev->ch_releaseQ);
8628991f 2732 mutex_init(&sdev->mutex);
a42d985b 2733
a42d985b
BVA		 2734 sdev->pd = ib_alloc_pd(device);
2735 if (IS_ERR(sdev->pd))
2736 goto free_dev;
2737
4a061b28 2738 sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
a42d985b
BVA		 2739
2740 srq_attr.event_handler = srpt_srq_event;
2741 srq_attr.srq_context = (void *)sdev;
2742 srq_attr.attr.max_wr = sdev->srq_size;
2743 srq_attr.attr.max_sge = 1;
2744 srq_attr.attr.srq_limit = 0;
6f360336 2745 srq_attr.srq_type = IB_SRQT_BASIC;
a42d985b
BVA		 2746
2747 sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
2748 if (IS_ERR(sdev->srq))
5a783956 2749 goto err_pd;
a42d985b
BVA		 2750
2751 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
4a061b28 2752 __func__, sdev->srq_size, sdev->device->attrs.max_srq_wr,
a42d985b
BVA		 2753 device->name);
2754
2755 if (!srpt_service_guid)
2756 srpt_service_guid = be64_to_cpu(device->node_guid);
2757
2758 sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
2759 if (IS_ERR(sdev->cm_id))
2760 goto err_srq;
2761
2762 /* print out target login information */
2763 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
2764 "pkey=ffff,service_id=%016llx\n", srpt_service_guid,
2765 srpt_service_guid, srpt_service_guid);
2766
2767 /*
2768 * We do not have a consistent service_id (ie. also id_ext of target_id)
2769 * to identify this target. We currently use the guid of the first HCA
2770 * in the system as service_id; therefore, the target_id will change
2771 * if this HCA is gone bad and replaced by different HCA
2772 */
73fec7fd 2773 if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0))
a42d985b
BVA		 2774 goto err_cm;
2775
2776 INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
2777 srpt_event_handler);
2778 if (ib_register_event_handler(&sdev->event_handler))
2779 goto err_cm;
2780
2781 sdev->ioctx_ring = (struct srpt_recv_ioctx **)
2782 srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
2783 sizeof(*sdev->ioctx_ring[0]),
2784 srp_max_req_size, DMA_FROM_DEVICE);
2785 if (!sdev->ioctx_ring)
2786 goto err_event;
2787
2788 for (i = 0; i < sdev->srq_size; ++i)
2789 srpt_post_recv(sdev, sdev->ioctx_ring[i]);
2790
f225066b 2791 WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
a42d985b
BVA		 2792
2793 for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
2794 sport = &sdev->port[i - 1];
2795 sport->sdev = sdev;
2796 sport->port = i;
2797 sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
2798 sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
2799 sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
2800 INIT_WORK(&sport->work, srpt_refresh_port_work);
a42d985b
BVA		 2801
2802 if (srpt_refresh_port(sport)) {
9f5d32af 2803 pr_err("MAD registration failed for %s-%d.\n",
f68cba4e 2804 sdev->device->name, i);
a42d985b
BVA		 2805 goto err_ring;
2806 }
2807 snprintf(sport->port_guid, sizeof(sport->port_guid),
2808 "0x%016llx%016llx",
2809 be64_to_cpu(sport->gid.global.subnet_prefix),
2810 be64_to_cpu(sport->gid.global.interface_id));
2811 }
2812
2813 spin_lock(&srpt_dev_lock);
2814 list_add_tail(&sdev->list, &srpt_dev_list);
2815 spin_unlock(&srpt_dev_lock);
2816
2817out:
2818 ib_set_client_data(device, &srpt_client, sdev);
2819 pr_debug("added %s.\n", device->name);
2820 return;
2821
2822err_ring:
2823 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
2824 sdev->srq_size, srp_max_req_size,
2825 DMA_FROM_DEVICE);
2826err_event:
2827 ib_unregister_event_handler(&sdev->event_handler);
2828err_cm:
2829 ib_destroy_cm_id(sdev->cm_id);
2830err_srq:
2831 ib_destroy_srq(sdev->srq);
a42d985b
BVA		 2832err_pd:
2833 ib_dealloc_pd(sdev->pd);
2834free_dev:
2835 kfree(sdev);
2836err:
2837 sdev = NULL;
9f5d32af 2838 pr_info("%s(%s) failed.\n", __func__, device->name);
a42d985b
BVA		 2839 goto out;
2840}
2841
2842/**
2843 * srpt_remove_one() - InfiniBand device removal callback function.
2844 */
7c1eb45a 2845static void srpt_remove_one(struct ib_device *device, void *client_data)
a42d985b 2846{
7c1eb45a 2847 struct srpt_device *sdev = client_data;
a42d985b
BVA		 2848 int i;
2849
a42d985b 2850 if (!sdev) {
9f5d32af 2851 pr_info("%s(%s): nothing to do.\n", __func__, device->name);
a42d985b
BVA		 2852 return;
2853 }
2854
2855 srpt_unregister_mad_agent(sdev);
2856
2857 ib_unregister_event_handler(&sdev->event_handler);
2858
2859 /* Cancel any work queued by the just unregistered IB event handler. */
2860 for (i = 0; i < sdev->device->phys_port_cnt; i++)
2861 cancel_work_sync(&sdev->port[i].work);
2862
2863 ib_destroy_cm_id(sdev->cm_id);
2864
2865 /*
2866 * Unregistering a target must happen after destroying sdev->cm_id
2867 * such that no new SRP_LOGIN_REQ information units can arrive while
2868 * destroying the target.
2869 */
2870 spin_lock(&srpt_dev_lock);
2871 list_del(&sdev->list);
2872 spin_unlock(&srpt_dev_lock);
2873 srpt_release_sdev(sdev);
2874
2875 ib_destroy_srq(sdev->srq);
a42d985b
BVA		 2876 ib_dealloc_pd(sdev->pd);
2877
2878 srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
2879 sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
2880 sdev->ioctx_ring = NULL;
2881 kfree(sdev);
2882}
2883
2884static struct ib_client srpt_client = {
2885 .name = DRV_NAME,
2886 .add = srpt_add_one,
2887 .remove = srpt_remove_one
2888};
2889
2890static int srpt_check_true(struct se_portal_group *se_tpg)
2891{
2892 return 1;
2893}
2894
2895static int srpt_check_false(struct se_portal_group *se_tpg)
2896{
2897 return 0;
2898}
2899
2900static char *srpt_get_fabric_name(void)
2901{
2902 return "srpt";
2903}
2904
a42d985b
BVA		 2905static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
2906{
2907 struct srpt_port *sport = container_of(tpg, struct srpt_port, port_tpg_1);
2908
2909 return sport->port_guid;
2910}
2911
2912static u16 srpt_get_tag(struct se_portal_group *tpg)
2913{
2914 return 1;
2915}
2916
a42d985b
BVA		 2917static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
2918{
2919 return 1;
2920}
2921
2922static void srpt_release_cmd(struct se_cmd *se_cmd)
2923{
9474b043
NB		 2924 struct srpt_send_ioctx *ioctx = container_of(se_cmd,
2925 struct srpt_send_ioctx, cmd);
2926 struct srpt_rdma_ch *ch = ioctx->ch;
2927 unsigned long flags;
2928
2929 WARN_ON(ioctx->state != SRPT_STATE_DONE);
2930 WARN_ON(ioctx->mapped_sg_count != 0);
2931
2932 if (ioctx->n_rbuf > 1) {
2933 kfree(ioctx->rbufs);
2934 ioctx->rbufs = NULL;
2935 ioctx->n_rbuf = 0;
2936 }
2937
2938 spin_lock_irqsave(&ch->spinlock, flags);
2939 list_add(&ioctx->free_list, &ch->free_list);
2940 spin_unlock_irqrestore(&ch->spinlock, flags);
a42d985b
BVA		 2941}
2942
a42d985b
BVA		 2943/**
2944 * srpt_close_session() - Forcibly close a session.
2945 *
2946 * Callback function invoked by the TCM core to clean up sessions associated
2947 * with a node ACL when the user invokes
2948 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2949 */
2950static void srpt_close_session(struct se_session *se_sess)
2951{
2952 DECLARE_COMPLETION_ONSTACK(release_done);
f108f0f6
BVA		 2953 struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
2954 struct srpt_device *sdev = ch->sport->sdev;
2955 bool wait;
a42d985b 2956
f108f0f6
BVA		 2957 pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
2958 ch->state);
a42d985b 2959
8628991f 2960 mutex_lock(&sdev->mutex);
a42d985b
BVA		 2961 BUG_ON(ch->release_done);
2962 ch->release_done = &release_done;
f108f0f6 2963 wait = !list_empty(&ch->list);
aaf45bd8 2964 srpt_disconnect_ch(ch);
8628991f 2965 mutex_unlock(&sdev->mutex);
a42d985b 2966
f108f0f6
BVA		 2967 if (!wait)
2968 return;
2969
2970 while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0)
2971 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
2972 ch->sess_name, ch->qp->qp_num, ch->state);
a42d985b
BVA		 2973}
2974
a42d985b
BVA		 2975/**
2976 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
2977 *
2978 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
2979 * This object represents an arbitrary integer used to uniquely identify a
2980 * particular attached remote initiator port to a particular SCSI target port
2981 * within a particular SCSI target device within a particular SCSI instance.
2982 */
2983static u32 srpt_sess_get_index(struct se_session *se_sess)
2984{
2985 return 0;
2986}
2987
2988static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
2989{
2990}
2991
a42d985b
BVA		 2992/* Note: only used from inside debug printk's by the TCM core. */
2993static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
2994{
2995 struct srpt_send_ioctx *ioctx;
2996
2997 ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
2998 return srpt_get_cmd_state(ioctx);
2999}
3000
a42d985b
BVA		 3001/**
3002 * srpt_parse_i_port_id() - Parse an initiator port ID.
3003 * @name: ASCII representation of a 128-bit initiator port ID.
3004 * @i_port_id: Binary 128-bit port ID.
3005 */
3006static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
3007{
3008 const char *p;
3009 unsigned len, count, leading_zero_bytes;
3010 int ret, rc;
3011
3012 p = name;
b60459f0 3013 if (strncasecmp(p, "0x", 2) == 0)
a42d985b
BVA		 3014 p += 2;
3015 ret = -EINVAL;
3016 len = strlen(p);
3017 if (len % 2)
3018 goto out;
3019 count = min(len / 2, 16U);
3020 leading_zero_bytes = 16 - count;
3021 memset(i_port_id, 0, leading_zero_bytes);
3022 rc = hex2bin(i_port_id + leading_zero_bytes, p, count);
3023 if (rc < 0)
3024 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc);
3025 ret = 0;
3026out:
3027 return ret;
3028}
3029
3030/*
3031 * configfs callback function invoked for
3032 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3033 */
c7d6a803 3034static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
a42d985b 3035{
a42d985b
BVA		 3036 u8 i_port_id[16];
3037
3038 if (srpt_parse_i_port_id(i_port_id, name) < 0) {
9f5d32af 3039 pr_err("invalid initiator port ID %s\n", name);
c7d6a803 3040 return -EINVAL;
a42d985b 3041 }
c7d6a803 3042 return 0;
a42d985b
BVA		 3043}
3044
2eafd729
CH		 3045static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,
3046 char *page)
a42d985b 3047{
2eafd729 3048 struct se_portal_group *se_tpg = attrib_to_tpg(item);
a42d985b
BVA		 3049 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3050
3051 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
3052}
3053
2eafd729
CH		 3054static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,
3055 const char *page, size_t count)
a42d985b 3056{
2eafd729 3057 struct se_portal_group *se_tpg = attrib_to_tpg(item);
a42d985b
BVA		 3058 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3059 unsigned long val;
3060 int ret;
3061
9d8abf45 3062 ret = kstrtoul(page, 0, &val);
a42d985b 3063 if (ret < 0) {
9d8abf45 3064 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 3065 return -EINVAL;
3066 }
3067 if (val > MAX_SRPT_RDMA_SIZE) {
3068 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
3069 MAX_SRPT_RDMA_SIZE);
3070 return -EINVAL;
3071 }
3072 if (val < DEFAULT_MAX_RDMA_SIZE) {
3073 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
3074 val, DEFAULT_MAX_RDMA_SIZE);
3075 return -EINVAL;
3076 }
3077 sport->port_attrib.srp_max_rdma_size = val;
3078
3079 return count;
3080}
3081
2eafd729
CH		 3082static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,
3083 char *page)
a42d985b 3084{
2eafd729 3085 struct se_portal_group *se_tpg = attrib_to_tpg(item);
a42d985b
BVA		 3086 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3087
3088 return sprintf(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
3089}
3090
2eafd729
CH		 3091static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,
3092 const char *page, size_t count)
a42d985b 3093{
2eafd729 3094 struct se_portal_group *se_tpg = attrib_to_tpg(item);
a42d985b
BVA		 3095 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3096 unsigned long val;
3097 int ret;
3098
9d8abf45 3099 ret = kstrtoul(page, 0, &val);
a42d985b 3100 if (ret < 0) {
9d8abf45 3101 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 3102 return -EINVAL;
3103 }
3104 if (val > MAX_SRPT_RSP_SIZE) {
3105 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
3106 MAX_SRPT_RSP_SIZE);
3107 return -EINVAL;
3108 }
3109 if (val < MIN_MAX_RSP_SIZE) {
3110 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
3111 MIN_MAX_RSP_SIZE);
3112 return -EINVAL;
3113 }
3114 sport->port_attrib.srp_max_rsp_size = val;
3115
3116 return count;
3117}
3118
2eafd729
CH		 3119static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,
3120 char *page)
a42d985b 3121{
2eafd729 3122 struct se_portal_group *se_tpg = attrib_to_tpg(item);
a42d985b
BVA		 3123 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3124
3125 return sprintf(page, "%u\n", sport->port_attrib.srp_sq_size);
3126}
3127
2eafd729
CH		 3128static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,
3129 const char *page, size_t count)
a42d985b 3130{
2eafd729 3131 struct se_portal_group *se_tpg = attrib_to_tpg(item);
a42d985b
BVA		 3132 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3133 unsigned long val;
3134 int ret;
3135
9d8abf45 3136 ret = kstrtoul(page, 0, &val);
a42d985b 3137 if (ret < 0) {
9d8abf45 3138 pr_err("kstrtoul() failed with ret: %d\n", ret);
a42d985b
BVA		 3139 return -EINVAL;
3140 }
3141 if (val > MAX_SRPT_SRQ_SIZE) {
3142 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
3143 MAX_SRPT_SRQ_SIZE);
3144 return -EINVAL;
3145 }
3146 if (val < MIN_SRPT_SRQ_SIZE) {
3147 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
3148 MIN_SRPT_SRQ_SIZE);
3149 return -EINVAL;
3150 }
3151 sport->port_attrib.srp_sq_size = val;
3152
3153 return count;
3154}
3155
2eafd729
CH		 3156CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);
3157CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);
3158CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);
a42d985b
BVA		 3159
3160static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
2eafd729
CH		 3161 &srpt_tpg_attrib_attr_srp_max_rdma_size,
3162 &srpt_tpg_attrib_attr_srp_max_rsp_size,
3163 &srpt_tpg_attrib_attr_srp_sq_size,
a42d985b
BVA		 3164 NULL,
3165};
3166
2eafd729 3167static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page)
a42d985b 3168{
2eafd729 3169 struct se_portal_group *se_tpg = to_tpg(item);
a42d985b
BVA		 3170 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3171
3172 return snprintf(page, PAGE_SIZE, "%d\n", (sport->enabled) ? 1: 0);
3173}
3174
2eafd729
CH		 3175static ssize_t srpt_tpg_enable_store(struct config_item *item,
3176 const char *page, size_t count)
a42d985b 3177{
2eafd729 3178 struct se_portal_group *se_tpg = to_tpg(item);
a42d985b
BVA		 3179 struct srpt_port *sport = container_of(se_tpg, struct srpt_port, port_tpg_1);
3180 unsigned long tmp;
3181 int ret;
3182
9d8abf45 3183 ret = kstrtoul(page, 0, &tmp);
a42d985b 3184 if (ret < 0) {
9f5d32af 3185 pr_err("Unable to extract srpt_tpg_store_enable\n");
a42d985b
BVA		 3186 return -EINVAL;
3187 }
3188
3189 if ((tmp != 0) && (tmp != 1)) {
9f5d32af 3190 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
a42d985b
BVA		 3191 return -EINVAL;
3192 }
3193 if (tmp == 1)
3194 sport->enabled = true;
3195 else
3196 sport->enabled = false;
3197
3198 return count;
3199}
3200
2eafd729 3201CONFIGFS_ATTR(srpt_tpg_, enable);
a42d985b
BVA		 3202
3203static struct configfs_attribute *srpt_tpg_attrs[] = {
2eafd729 3204 &srpt_tpg_attr_enable,
a42d985b
BVA		 3205 NULL,
3206};
3207
3208/**
3209 * configfs callback invoked for
3210 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
3211 */
3212static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
3213 struct config_group *group,
3214 const char *name)
3215{
3216 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3217 int res;
3218
3219 /* Initialize sport->port_wwn and sport->port_tpg_1 */
bc0c94b1 3220 res = core_tpg_register(&sport->port_wwn, &sport->port_tpg_1, SCSI_PROTOCOL_SRP);
a42d985b
BVA		 3221 if (res)
3222 return ERR_PTR(res);
3223
3224 return &sport->port_tpg_1;
3225}
3226
3227/**
3228 * configfs callback invoked for
3229 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
3230 */
3231static void srpt_drop_tpg(struct se_portal_group *tpg)
3232{
3233 struct srpt_port *sport = container_of(tpg,
3234 struct srpt_port, port_tpg_1);
3235
3236 sport->enabled = false;
3237 core_tpg_deregister(&sport->port_tpg_1);
3238}
3239
3240/**
3241 * configfs callback invoked for
3242 * mkdir /sys/kernel/config/target/$driver/$port
3243 */
3244static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
3245 struct config_group *group,
3246 const char *name)
3247{
3248 struct srpt_port *sport;
3249 int ret;
3250
3251 sport = srpt_lookup_port(name);
3252 pr_debug("make_tport(%s)\n", name);
3253 ret = -EINVAL;
3254 if (!sport)
3255 goto err;
3256
3257 return &sport->port_wwn;
3258
3259err:
3260 return ERR_PTR(ret);
3261}
3262
3263/**
3264 * configfs callback invoked for
3265 * rmdir /sys/kernel/config/target/$driver/$port
3266 */
3267static void srpt_drop_tport(struct se_wwn *wwn)
3268{
3269 struct srpt_port *sport = container_of(wwn, struct srpt_port, port_wwn);
3270
3271 pr_debug("drop_tport(%s\n", config_item_name(&sport->port_wwn.wwn_group.cg_item));
3272}
3273
2eafd729 3274static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)
a42d985b
BVA		 3275{
3276 return scnprintf(buf, PAGE_SIZE, "%s\n", DRV_VERSION);
3277}
3278
2eafd729 3279CONFIGFS_ATTR_RO(srpt_wwn_, version);
a42d985b
BVA		 3280
3281static struct configfs_attribute *srpt_wwn_attrs[] = {
2eafd729 3282 &srpt_wwn_attr_version,
a42d985b
BVA		 3283 NULL,
3284};
3285
9ac8928e
CH		 3286static const struct target_core_fabric_ops srpt_template = {
3287 .module = THIS_MODULE,
3288 .name = "srpt",
a42d985b 3289 .get_fabric_name = srpt_get_fabric_name,
a42d985b
BVA		 3290 .tpg_get_wwn = srpt_get_fabric_wwn,
3291 .tpg_get_tag = srpt_get_tag,
a42d985b
BVA		 3292 .tpg_check_demo_mode = srpt_check_false,
3293 .tpg_check_demo_mode_cache = srpt_check_true,
3294 .tpg_check_demo_mode_write_protect = srpt_check_true,
3295 .tpg_check_prod_mode_write_protect = srpt_check_false,
a42d985b
BVA		 3296 .tpg_get_inst_index = srpt_tpg_get_inst_index,
3297 .release_cmd = srpt_release_cmd,
3298 .check_stop_free = srpt_check_stop_free,
3299 .shutdown_session = srpt_shutdown_session,
3300 .close_session = srpt_close_session,
a42d985b
BVA		 3301 .sess_get_index = srpt_sess_get_index,
3302 .sess_get_initiator_sid = NULL,
3303 .write_pending = srpt_write_pending,
3304 .write_pending_status = srpt_write_pending_status,
3305 .set_default_node_attributes = srpt_set_default_node_attrs,
a42d985b 3306 .get_cmd_state = srpt_get_tcm_cmd_state,
b79fafac 3307 .queue_data_in = srpt_queue_data_in,
a42d985b 3308 .queue_status = srpt_queue_status,
b79fafac 3309 .queue_tm_rsp = srpt_queue_tm_rsp,
131e6abc 3310 .aborted_task = srpt_aborted_task,
a42d985b
BVA		 3311 /*
3312 * Setup function pointers for generic logic in
3313 * target_core_fabric_configfs.c
3314 */
3315 .fabric_make_wwn = srpt_make_tport,
3316 .fabric_drop_wwn = srpt_drop_tport,
3317 .fabric_make_tpg = srpt_make_tpg,
3318 .fabric_drop_tpg = srpt_drop_tpg,
c7d6a803 3319 .fabric_init_nodeacl = srpt_init_nodeacl,
9ac8928e
CH		 3320
3321 .tfc_wwn_attrs = srpt_wwn_attrs,
3322 .tfc_tpg_base_attrs = srpt_tpg_attrs,
3323 .tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
a42d985b
BVA		 3324};
3325
3326/**
3327 * srpt_init_module() - Kernel module initialization.
3328 *
3329 * Note: Since ib_register_client() registers callback functions, and since at
3330 * least one of these callback functions (srpt_add_one()) calls target core
3331 * functions, this driver must be registered with the target core before
3332 * ib_register_client() is called.
3333 */
3334static int __init srpt_init_module(void)
3335{
3336 int ret;
3337
3338 ret = -EINVAL;
3339 if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
9f5d32af 3340 pr_err("invalid value %d for kernel module parameter"
a42d985b
BVA		 3341 " srp_max_req_size -- must be at least %d.\n",
3342 srp_max_req_size, MIN_MAX_REQ_SIZE);
3343 goto out;
3344 }
3345
3346 if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
3347 || srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
9f5d32af 3348 pr_err("invalid value %d for kernel module parameter"
a42d985b
BVA		 3349 " srpt_srq_size -- must be in the range [%d..%d].\n",
3350 srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
3351 goto out;
3352 }
3353
9ac8928e
CH		 3354 ret = target_register_template(&srpt_template);
3355 if (ret)
a42d985b 3356 goto out;
a42d985b
BVA		 3357
3358 ret = ib_register_client(&srpt_client);
3359 if (ret) {
9f5d32af 3360 pr_err("couldn't register IB client\n");
a42d985b
BVA		 3361 goto out_unregister_target;
3362 }
3363
3364 return 0;
3365
3366out_unregister_target:
9ac8928e 3367 target_unregister_template(&srpt_template);
a42d985b
BVA		 3368out:
3369 return ret;
3370}
3371
3372static void __exit srpt_cleanup_module(void)
3373{
3374 ib_unregister_client(&srpt_client);
9ac8928e 3375 target_unregister_template(&srpt_template);
a42d985b
BVA		 3376}
3377
3378module_init(srpt_init_module);
3379module_exit(srpt_cleanup_module);
Linux 6.x block layer and io_uring tree(s)