1 /*
2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
4 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34 #include <linux/kernel.h>
35 #include <linux/slab.h>
36 #include <linux/delay.h>
37
38 #include "iscsi_iser.h"
39
iser_qp_event_callback(struct ib_event * cause,void * context)40 static void iser_qp_event_callback(struct ib_event *cause, void *context)
41 {
42 iser_err("qp event %s (%d)\n",
43 ib_event_msg(cause->event), cause->event);
44 }
45
iser_event_handler(struct ib_event_handler * handler,struct ib_event * event)46 static void iser_event_handler(struct ib_event_handler *handler,
47 struct ib_event *event)
48 {
49 iser_err("async event %s (%d) on device %s port %d\n",
50 ib_event_msg(event->event), event->event,
51 dev_name(&event->device->dev), event->element.port_num);
52 }
53
54 /*
55 * iser_create_device_ib_res - creates Protection Domain (PD), Completion
56 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
57 * the adaptor.
58 *
59 * Return: 0 on success, -1 on failure
60 */
iser_create_device_ib_res(struct iser_device * device)61 static int iser_create_device_ib_res(struct iser_device *device)
62 {
63 struct ib_device *ib_dev = device->ib_device;
64
65 if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) {
66 iser_err("IB device does not support memory registrations\n");
67 return -1;
68 }
69
70 device->pd = ib_alloc_pd(ib_dev,
71 iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
72 if (IS_ERR(device->pd))
73 goto pd_err;
74
75 INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev,
76 iser_event_handler);
77 ib_register_event_handler(&device->event_handler);
78 return 0;
79
80 pd_err:
81 iser_err("failed to allocate an IB resource\n");
82 return -1;
83 }
84
85 /*
86 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
87 * CQ and PD created with the device associated with the adaptor.
88 */
iser_free_device_ib_res(struct iser_device * device)89 static void iser_free_device_ib_res(struct iser_device *device)
90 {
91 ib_unregister_event_handler(&device->event_handler);
92 ib_dealloc_pd(device->pd);
93
94 device->pd = NULL;
95 }
96
97 static struct iser_fr_desc *
iser_create_fastreg_desc(struct iser_device * device,struct ib_pd * pd,bool pi_enable,unsigned int size)98 iser_create_fastreg_desc(struct iser_device *device,
99 struct ib_pd *pd,
100 bool pi_enable,
101 unsigned int size)
102 {
103 struct iser_fr_desc *desc;
104 struct ib_device *ib_dev = device->ib_device;
105 enum ib_mr_type mr_type;
106 int ret;
107
108 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
109 if (!desc)
110 return ERR_PTR(-ENOMEM);
111
112 if (ib_dev->attrs.kernel_cap_flags & IBK_SG_GAPS_REG)
113 mr_type = IB_MR_TYPE_SG_GAPS;
114 else
115 mr_type = IB_MR_TYPE_MEM_REG;
116
117 desc->rsc.mr = ib_alloc_mr(pd, mr_type, size);
118 if (IS_ERR(desc->rsc.mr)) {
119 ret = PTR_ERR(desc->rsc.mr);
120 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret);
121 goto err_alloc_mr;
122 }
123
124 if (pi_enable) {
125 desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size);
126 if (IS_ERR(desc->rsc.sig_mr)) {
127 ret = PTR_ERR(desc->rsc.sig_mr);
128 iser_err("Failed to allocate sig_mr err=%d\n", ret);
129 goto err_alloc_mr_integrity;
130 }
131 }
132
133 return desc;
134
135 err_alloc_mr_integrity:
136 ib_dereg_mr(desc->rsc.mr);
137 err_alloc_mr:
138 kfree(desc);
139
140 return ERR_PTR(ret);
141 }
142
iser_destroy_fastreg_desc(struct iser_fr_desc * desc)143 static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc)
144 {
145 struct iser_reg_resources *res = &desc->rsc;
146
147 ib_dereg_mr(res->mr);
148 if (res->sig_mr) {
149 ib_dereg_mr(res->sig_mr);
150 res->sig_mr = NULL;
151 }
152 kfree(desc);
153 }
154
155 /**
156 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors
157 * for fast registration work requests.
158 * @ib_conn: connection RDMA resources
159 * @cmds_max: max number of SCSI commands for this connection
160 * @size: max number of pages per map request
161 *
162 * Return: 0 on success, or errno code on failure
163 */
iser_alloc_fastreg_pool(struct ib_conn * ib_conn,unsigned cmds_max,unsigned int size)164 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
165 unsigned cmds_max,
166 unsigned int size)
167 {
168 struct iser_device *device = ib_conn->device;
169 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
170 struct iser_fr_desc *desc;
171 int i, ret;
172
173 INIT_LIST_HEAD(&fr_pool->list);
174 INIT_LIST_HEAD(&fr_pool->all_list);
175 spin_lock_init(&fr_pool->lock);
176 fr_pool->size = 0;
177 for (i = 0; i < cmds_max; i++) {
178 desc = iser_create_fastreg_desc(device, device->pd,
179 ib_conn->pi_support, size);
180 if (IS_ERR(desc)) {
181 ret = PTR_ERR(desc);
182 goto err;
183 }
184
185 list_add_tail(&desc->list, &fr_pool->list);
186 list_add_tail(&desc->all_list, &fr_pool->all_list);
187 fr_pool->size++;
188 }
189
190 return 0;
191
192 err:
193 iser_free_fastreg_pool(ib_conn);
194 return ret;
195 }
196
197 /**
198 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
199 * @ib_conn: connection RDMA resources
200 */
iser_free_fastreg_pool(struct ib_conn * ib_conn)201 void iser_free_fastreg_pool(struct ib_conn *ib_conn)
202 {
203 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
204 struct iser_fr_desc *desc, *tmp;
205 int i = 0;
206
207 if (list_empty(&fr_pool->all_list))
208 return;
209
210 iser_info("freeing conn %p fr pool\n", ib_conn);
211
212 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) {
213 list_del(&desc->all_list);
214 iser_destroy_fastreg_desc(desc);
215 ++i;
216 }
217
218 if (i < fr_pool->size)
219 iser_warn("pool still has %d regions registered\n",
220 fr_pool->size - i);
221 }
222
223 /*
224 * iser_create_ib_conn_res - Queue-Pair (QP)
225 *
226 * Return: 0 on success, -1 on failure
227 */
iser_create_ib_conn_res(struct ib_conn * ib_conn)228 static int iser_create_ib_conn_res(struct ib_conn *ib_conn)
229 {
230 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
231 struct iser_device *device;
232 struct ib_device *ib_dev;
233 struct ib_qp_init_attr init_attr;
234 int ret = -ENOMEM;
235 unsigned int max_send_wr, cq_size;
236
237 BUG_ON(ib_conn->device == NULL);
238
239 device = ib_conn->device;
240 ib_dev = device->ib_device;
241
242 /* +1 for drain */
243 if (ib_conn->pi_support)
244 max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1;
245 else
246 max_send_wr = ISER_QP_MAX_REQ_DTOS + 1;
247 max_send_wr = min_t(unsigned int, max_send_wr,
248 (unsigned int)ib_dev->attrs.max_qp_wr);
249
250 cq_size = max_send_wr + ISER_QP_MAX_RECV_DTOS;
251 ib_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_SOFTIRQ);
252 if (IS_ERR(ib_conn->cq)) {
253 ret = PTR_ERR(ib_conn->cq);
254 goto cq_err;
255 }
256 ib_conn->cq_size = cq_size;
257
258 memset(&init_attr, 0, sizeof(init_attr));
259
260 init_attr.event_handler = iser_qp_event_callback;
261 init_attr.qp_context = (void *)ib_conn;
262 init_attr.send_cq = ib_conn->cq;
263 init_attr.recv_cq = ib_conn->cq;
264 /* +1 for drain */
265 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS + 1;
266 init_attr.cap.max_send_sge = 2;
267 init_attr.cap.max_recv_sge = 1;
268 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
269 init_attr.qp_type = IB_QPT_RC;
270 init_attr.cap.max_send_wr = max_send_wr;
271 if (ib_conn->pi_support)
272 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
273 iser_conn->max_cmds = ISER_GET_MAX_XMIT_CMDS(max_send_wr - 1);
274
275 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
276 if (ret)
277 goto out_err;
278
279 ib_conn->qp = ib_conn->cma_id->qp;
280 iser_info("setting conn %p cma_id %p qp %p max_send_wr %d\n", ib_conn,
281 ib_conn->cma_id, ib_conn->cma_id->qp, max_send_wr);
282 return ret;
283
284 out_err:
285 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size);
286 cq_err:
287 iser_err("unable to alloc mem or create resource, err %d\n", ret);
288
289 return ret;
290 }
291
292 /*
293 * based on the resolved device node GUID see if there already allocated
294 * device for this device. If there's no such, create one.
295 */
296 static
iser_device_find_by_ib_device(struct rdma_cm_id * cma_id)297 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
298 {
299 struct iser_device *device;
300
301 mutex_lock(&ig.device_list_mutex);
302
303 list_for_each_entry(device, &ig.device_list, ig_list)
304 /* find if there's a match using the node GUID */
305 if (device->ib_device->node_guid == cma_id->device->node_guid)
306 goto inc_refcnt;
307
308 device = kzalloc(sizeof *device, GFP_KERNEL);
309 if (!device)
310 goto out;
311
312 /* assign this device to the device */
313 device->ib_device = cma_id->device;
314 /* init the device and link it into ig device list */
315 if (iser_create_device_ib_res(device)) {
316 kfree(device);
317 device = NULL;
318 goto out;
319 }
320 list_add(&device->ig_list, &ig.device_list);
321
322 inc_refcnt:
323 device->refcount++;
324 out:
325 mutex_unlock(&ig.device_list_mutex);
326 return device;
327 }
328
329 /* if there's no demand for this device, release it */
iser_device_try_release(struct iser_device * device)330 static void iser_device_try_release(struct iser_device *device)
331 {
332 mutex_lock(&ig.device_list_mutex);
333 device->refcount--;
334 iser_info("device %p refcount %d\n", device, device->refcount);
335 if (!device->refcount) {
336 iser_free_device_ib_res(device);
337 list_del(&device->ig_list);
338 kfree(device);
339 }
340 mutex_unlock(&ig.device_list_mutex);
341 }
342
iser_release_work(struct work_struct * work)343 void iser_release_work(struct work_struct *work)
344 {
345 struct iser_conn *iser_conn;
346
347 iser_conn = container_of(work, struct iser_conn, release_work);
348
349 /* Wait for conn_stop to complete */
350 wait_for_completion(&iser_conn->stop_completion);
351 /* Wait for IB resouces cleanup to complete */
352 wait_for_completion(&iser_conn->ib_completion);
353
354 mutex_lock(&iser_conn->state_mutex);
355 iser_conn->state = ISER_CONN_DOWN;
356 mutex_unlock(&iser_conn->state_mutex);
357
358 iser_conn_release(iser_conn);
359 }
360
361 /**
362 * iser_free_ib_conn_res - release IB related resources
363 * @iser_conn: iser connection struct
364 * @destroy: indicator if we need to try to release the
365 * iser device and memory regoins pool (only iscsi
366 * shutdown and DEVICE_REMOVAL will use this).
367 *
368 * This routine is called with the iser state mutex held
369 * so the cm_id removal is out of here. It is Safe to
370 * be invoked multiple times.
371 */
iser_free_ib_conn_res(struct iser_conn * iser_conn,bool destroy)372 static void iser_free_ib_conn_res(struct iser_conn *iser_conn, bool destroy)
373 {
374 struct ib_conn *ib_conn = &iser_conn->ib_conn;
375 struct iser_device *device = ib_conn->device;
376
377 iser_info("freeing conn %p cma_id %p qp %p\n",
378 iser_conn, ib_conn->cma_id, ib_conn->qp);
379
380 if (ib_conn->qp) {
381 rdma_destroy_qp(ib_conn->cma_id);
382 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size);
383 ib_conn->qp = NULL;
384 }
385
386 if (destroy) {
387 if (iser_conn->rx_descs)
388 iser_free_rx_descriptors(iser_conn);
389
390 if (device) {
391 iser_device_try_release(device);
392 ib_conn->device = NULL;
393 }
394 }
395 }
396
397 /**
398 * iser_conn_release - Frees all conn objects and deallocs conn descriptor
399 * @iser_conn: iSER connection context
400 */
iser_conn_release(struct iser_conn * iser_conn)401 void iser_conn_release(struct iser_conn *iser_conn)
402 {
403 struct ib_conn *ib_conn = &iser_conn->ib_conn;
404
405 mutex_lock(&ig.connlist_mutex);
406 list_del(&iser_conn->conn_list);
407 mutex_unlock(&ig.connlist_mutex);
408
409 mutex_lock(&iser_conn->state_mutex);
410 /* In case we endup here without ep_disconnect being invoked. */
411 if (iser_conn->state != ISER_CONN_DOWN) {
412 iser_warn("iser conn %p state %d, expected state down.\n",
413 iser_conn, iser_conn->state);
414 iscsi_destroy_endpoint(iser_conn->ep);
415 iser_conn->state = ISER_CONN_DOWN;
416 }
417 /*
418 * In case we never got to bind stage, we still need to
419 * release IB resources (which is safe to call more than once).
420 */
421 iser_free_ib_conn_res(iser_conn, true);
422 mutex_unlock(&iser_conn->state_mutex);
423
424 if (ib_conn->cma_id) {
425 rdma_destroy_id(ib_conn->cma_id);
426 ib_conn->cma_id = NULL;
427 }
428
429 kfree(iser_conn);
430 }
431
432 /**
433 * iser_conn_terminate - triggers start of the disconnect procedures and
434 * waits for them to be done
435 * @iser_conn: iSER connection context
436 *
437 * Called with state mutex held
438 */
iser_conn_terminate(struct iser_conn * iser_conn)439 int iser_conn_terminate(struct iser_conn *iser_conn)
440 {
441 struct ib_conn *ib_conn = &iser_conn->ib_conn;
442 int err = 0;
443
444 lockdep_assert_held(&iser_conn->state_mutex);
445
446 /* terminate the iser conn only if the conn state is UP */
447 if (iser_conn->state != ISER_CONN_UP)
448 return 0;
449
450 iser_conn->state = ISER_CONN_TERMINATING;
451 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state);
452
453 /* suspend queuing of new iscsi commands */
454 if (iser_conn->iscsi_conn)
455 iscsi_suspend_queue(iser_conn->iscsi_conn);
456
457 /*
458 * In case we didn't already clean up the cma_id (peer initiated
459 * a disconnection), we need to Cause the CMA to change the QP
460 * state to ERROR.
461 */
462 if (ib_conn->cma_id) {
463 err = rdma_disconnect(ib_conn->cma_id);
464 if (err)
465 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
466 iser_conn, err);
467
468 /* block until all flush errors are consumed */
469 ib_drain_qp(ib_conn->qp);
470 }
471
472 return 1;
473 }
474
475 /*
476 * Called with state mutex held
477 */
iser_connect_error(struct rdma_cm_id * cma_id)478 static void iser_connect_error(struct rdma_cm_id *cma_id)
479 {
480 struct iser_conn *iser_conn = cma_id->context;
481
482 lockdep_assert_held(&iser_conn->state_mutex);
483
484 iser_conn->state = ISER_CONN_TERMINATING;
485 }
486
iser_calc_scsi_params(struct iser_conn * iser_conn,unsigned int max_sectors)487 static void iser_calc_scsi_params(struct iser_conn *iser_conn,
488 unsigned int max_sectors)
489 {
490 struct iser_device *device = iser_conn->ib_conn.device;
491 struct ib_device_attr *attr = &device->ib_device->attrs;
492 unsigned short sg_tablesize, sup_sg_tablesize;
493 unsigned short reserved_mr_pages;
494 u32 max_num_sg;
495
496 /*
497 * FRs without SG_GAPS can only map up to a (device) page per entry,
498 * but if the first entry is misaligned we'll end up using two entries
499 * (head and tail) for a single page worth data, so one additional
500 * entry is required.
501 */
502 if (attr->kernel_cap_flags & IBK_SG_GAPS_REG)
503 reserved_mr_pages = 0;
504 else
505 reserved_mr_pages = 1;
506
507 if (iser_conn->ib_conn.pi_support)
508 max_num_sg = attr->max_pi_fast_reg_page_list_len;
509 else
510 max_num_sg = attr->max_fast_reg_page_list_len;
511
512 sg_tablesize = DIV_ROUND_UP(max_sectors * SECTOR_SIZE, SZ_4K);
513 sup_sg_tablesize = min_t(uint, ISCSI_ISER_MAX_SG_TABLESIZE,
514 max_num_sg - reserved_mr_pages);
515 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize);
516 iser_conn->pages_per_mr =
517 iser_conn->scsi_sg_tablesize + reserved_mr_pages;
518 }
519
520 /*
521 * Called with state mutex held
522 */
iser_addr_handler(struct rdma_cm_id * cma_id)523 static void iser_addr_handler(struct rdma_cm_id *cma_id)
524 {
525 struct iser_conn *iser_conn = cma_id->context;
526 struct iser_device *device;
527 struct ib_conn *ib_conn;
528 int ret;
529
530 lockdep_assert_held(&iser_conn->state_mutex);
531
532 if (iser_conn->state != ISER_CONN_PENDING)
533 /* bailout */
534 return;
535
536 ib_conn = &iser_conn->ib_conn;
537 device = iser_device_find_by_ib_device(cma_id);
538 if (!device) {
539 iser_err("device lookup/creation failed\n");
540 iser_connect_error(cma_id);
541 return;
542 }
543
544 ib_conn->device = device;
545
546 /* connection T10-PI support */
547 if (iser_pi_enable) {
548 if (!(device->ib_device->attrs.kernel_cap_flags &
549 IBK_INTEGRITY_HANDOVER)) {
550 iser_warn("T10-PI requested but not supported on %s, "
551 "continue without T10-PI\n",
552 dev_name(&ib_conn->device->ib_device->dev));
553 ib_conn->pi_support = false;
554 } else {
555 ib_conn->pi_support = true;
556 }
557 }
558
559 iser_calc_scsi_params(iser_conn, iser_max_sectors);
560
561 ret = rdma_resolve_route(cma_id, 1000);
562 if (ret) {
563 iser_err("resolve route failed: %d\n", ret);
564 iser_connect_error(cma_id);
565 return;
566 }
567 }
568
569 /*
570 * Called with state mutex held
571 */
iser_route_handler(struct rdma_cm_id * cma_id)572 static void iser_route_handler(struct rdma_cm_id *cma_id)
573 {
574 struct rdma_conn_param conn_param;
575 int ret;
576 struct iser_cm_hdr req_hdr;
577 struct iser_conn *iser_conn = cma_id->context;
578 struct ib_conn *ib_conn = &iser_conn->ib_conn;
579 struct ib_device *ib_dev = ib_conn->device->ib_device;
580
581 lockdep_assert_held(&iser_conn->state_mutex);
582
583 if (iser_conn->state != ISER_CONN_PENDING)
584 /* bailout */
585 return;
586
587 ret = iser_create_ib_conn_res(ib_conn);
588 if (ret)
589 goto failure;
590
591 memset(&conn_param, 0, sizeof conn_param);
592 conn_param.responder_resources = ib_dev->attrs.max_qp_rd_atom;
593 conn_param.initiator_depth = 1;
594 conn_param.retry_count = 7;
595 conn_param.rnr_retry_count = 6;
596
597 memset(&req_hdr, 0, sizeof(req_hdr));
598 req_hdr.flags = ISER_ZBVA_NOT_SUP;
599 if (!iser_always_reg)
600 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP;
601 conn_param.private_data = (void *)&req_hdr;
602 conn_param.private_data_len = sizeof(struct iser_cm_hdr);
603
604 ret = rdma_connect_locked(cma_id, &conn_param);
605 if (ret) {
606 iser_err("failure connecting: %d\n", ret);
607 goto failure;
608 }
609
610 return;
611 failure:
612 iser_connect_error(cma_id);
613 }
614
615 /*
616 * Called with state mutex held
617 */
iser_connected_handler(struct rdma_cm_id * cma_id,const void * private_data)618 static void iser_connected_handler(struct rdma_cm_id *cma_id,
619 const void *private_data)
620 {
621 struct iser_conn *iser_conn = cma_id->context;
622 struct ib_qp_attr attr;
623 struct ib_qp_init_attr init_attr;
624
625 lockdep_assert_held(&iser_conn->state_mutex);
626
627 if (iser_conn->state != ISER_CONN_PENDING)
628 /* bailout */
629 return;
630
631 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);
632 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num);
633
634 if (private_data) {
635 u8 flags = *(u8 *)private_data;
636
637 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP);
638 }
639
640 iser_info("conn %p: negotiated %s invalidation\n",
641 iser_conn, iser_conn->snd_w_inv ? "remote" : "local");
642
643 iser_conn->state = ISER_CONN_UP;
644 complete(&iser_conn->up_completion);
645 }
646
647 /*
648 * Called with state mutex held
649 */
iser_cleanup_handler(struct rdma_cm_id * cma_id,bool destroy)650 static void iser_cleanup_handler(struct rdma_cm_id *cma_id,
651 bool destroy)
652 {
653 struct iser_conn *iser_conn = cma_id->context;
654
655 lockdep_assert_held(&iser_conn->state_mutex);
656 /*
657 * We are not guaranteed that we visited disconnected_handler
658 * by now, call it here to be safe that we handle CM drep
659 * and flush errors.
660 */
661 if (iser_conn_terminate(iser_conn)) {
662 if (iser_conn->iscsi_conn)
663 iscsi_conn_failure(iser_conn->iscsi_conn,
664 ISCSI_ERR_CONN_FAILED);
665 else
666 iser_err("iscsi_iser connection isn't bound\n");
667 }
668 iser_free_ib_conn_res(iser_conn, destroy);
669 complete(&iser_conn->ib_completion);
670 }
671
iser_cma_handler(struct rdma_cm_id * cma_id,struct rdma_cm_event * event)672 static int iser_cma_handler(struct rdma_cm_id *cma_id,
673 struct rdma_cm_event *event)
674 {
675 struct iser_conn *iser_conn;
676 int ret = 0;
677
678 iser_conn = cma_id->context;
679 iser_info("%s (%d): status %d conn %p id %p\n",
680 rdma_event_msg(event->event), event->event,
681 event->status, cma_id->context, cma_id);
682
683 mutex_lock(&iser_conn->state_mutex);
684 switch (event->event) {
685 case RDMA_CM_EVENT_ADDR_RESOLVED:
686 iser_addr_handler(cma_id);
687 break;
688 case RDMA_CM_EVENT_ROUTE_RESOLVED:
689 iser_route_handler(cma_id);
690 break;
691 case RDMA_CM_EVENT_ESTABLISHED:
692 iser_connected_handler(cma_id, event->param.conn.private_data);
693 break;
694 case RDMA_CM_EVENT_REJECTED:
695 iser_info("Connection rejected: %s\n",
696 rdma_reject_msg(cma_id, event->status));
697 fallthrough;
698 case RDMA_CM_EVENT_ADDR_ERROR:
699 case RDMA_CM_EVENT_ROUTE_ERROR:
700 case RDMA_CM_EVENT_CONNECT_ERROR:
701 case RDMA_CM_EVENT_UNREACHABLE:
702 iser_connect_error(cma_id);
703 break;
704 case RDMA_CM_EVENT_DISCONNECTED:
705 case RDMA_CM_EVENT_ADDR_CHANGE:
706 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
707 iser_cleanup_handler(cma_id, false);
708 break;
709 case RDMA_CM_EVENT_DEVICE_REMOVAL:
710 /*
711 * we *must* destroy the device as we cannot rely
712 * on iscsid to be around to initiate error handling.
713 * also if we are not in state DOWN implicitly destroy
714 * the cma_id.
715 */
716 iser_cleanup_handler(cma_id, true);
717 if (iser_conn->state != ISER_CONN_DOWN) {
718 iser_conn->ib_conn.cma_id = NULL;
719 ret = 1;
720 }
721 break;
722 default:
723 iser_err("Unexpected RDMA CM event: %s (%d)\n",
724 rdma_event_msg(event->event), event->event);
725 break;
726 }
727 mutex_unlock(&iser_conn->state_mutex);
728
729 return ret;
730 }
731
iser_conn_init(struct iser_conn * iser_conn)732 void iser_conn_init(struct iser_conn *iser_conn)
733 {
734 struct ib_conn *ib_conn = &iser_conn->ib_conn;
735
736 iser_conn->state = ISER_CONN_INIT;
737 init_completion(&iser_conn->stop_completion);
738 init_completion(&iser_conn->ib_completion);
739 init_completion(&iser_conn->up_completion);
740 INIT_LIST_HEAD(&iser_conn->conn_list);
741 mutex_init(&iser_conn->state_mutex);
742
743 ib_conn->reg_cqe.done = iser_reg_comp;
744 }
745
746 /*
747 * starts the process of connecting to the target
748 * sleeps until the connection is established or rejected
749 */
iser_connect(struct iser_conn * iser_conn,struct sockaddr * src_addr,struct sockaddr * dst_addr,int non_blocking)750 int iser_connect(struct iser_conn *iser_conn, struct sockaddr *src_addr,
751 struct sockaddr *dst_addr, int non_blocking)
752 {
753 struct ib_conn *ib_conn = &iser_conn->ib_conn;
754 int err = 0;
755
756 mutex_lock(&iser_conn->state_mutex);
757
758 sprintf(iser_conn->name, "%pISp", dst_addr);
759
760 iser_info("connecting to: %s\n", iser_conn->name);
761
762 /* the device is known only --after-- address resolution */
763 ib_conn->device = NULL;
764
765 iser_conn->state = ISER_CONN_PENDING;
766
767 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler,
768 iser_conn, RDMA_PS_TCP, IB_QPT_RC);
769 if (IS_ERR(ib_conn->cma_id)) {
770 err = PTR_ERR(ib_conn->cma_id);
771 iser_err("rdma_create_id failed: %d\n", err);
772 goto id_failure;
773 }
774
775 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000);
776 if (err) {
777 iser_err("rdma_resolve_addr failed: %d\n", err);
778 goto addr_failure;
779 }
780
781 if (!non_blocking) {
782 wait_for_completion_interruptible(&iser_conn->up_completion);
783
784 if (iser_conn->state != ISER_CONN_UP) {
785 err = -EIO;
786 goto connect_failure;
787 }
788 }
789 mutex_unlock(&iser_conn->state_mutex);
790
791 mutex_lock(&ig.connlist_mutex);
792 list_add(&iser_conn->conn_list, &ig.connlist);
793 mutex_unlock(&ig.connlist_mutex);
794 return 0;
795
796 id_failure:
797 ib_conn->cma_id = NULL;
798 addr_failure:
799 iser_conn->state = ISER_CONN_DOWN;
800 connect_failure:
801 mutex_unlock(&iser_conn->state_mutex);
802 iser_conn_release(iser_conn);
803 return err;
804 }
805
iser_post_recvl(struct iser_conn * iser_conn)806 int iser_post_recvl(struct iser_conn *iser_conn)
807 {
808 struct ib_conn *ib_conn = &iser_conn->ib_conn;
809 struct iser_login_desc *desc = &iser_conn->login_desc;
810 struct ib_recv_wr wr;
811 int ret;
812
813 desc->sge.addr = desc->rsp_dma;
814 desc->sge.length = ISER_RX_LOGIN_SIZE;
815 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey;
816
817 desc->cqe.done = iser_login_rsp;
818 wr.wr_cqe = &desc->cqe;
819 wr.sg_list = &desc->sge;
820 wr.num_sge = 1;
821 wr.next = NULL;
822
823 ret = ib_post_recv(ib_conn->qp, &wr, NULL);
824 if (unlikely(ret))
825 iser_err("ib_post_recv login failed ret=%d\n", ret);
826
827 return ret;
828 }
829
iser_post_recvm(struct iser_conn * iser_conn,struct iser_rx_desc * rx_desc)830 int iser_post_recvm(struct iser_conn *iser_conn, struct iser_rx_desc *rx_desc)
831 {
832 struct ib_conn *ib_conn = &iser_conn->ib_conn;
833 struct ib_recv_wr wr;
834 int ret;
835
836 rx_desc->cqe.done = iser_task_rsp;
837 wr.wr_cqe = &rx_desc->cqe;
838 wr.sg_list = &rx_desc->rx_sg;
839 wr.num_sge = 1;
840 wr.next = NULL;
841
842 ret = ib_post_recv(ib_conn->qp, &wr, NULL);
843 if (unlikely(ret))
844 iser_err("ib_post_recv failed ret=%d\n", ret);
845
846 return ret;
847 }
848
849
850 /**
851 * iser_post_send - Initiate a Send DTO operation
852 * @ib_conn: connection RDMA resources
853 * @tx_desc: iSER TX descriptor
854 *
855 * Return: 0 on success, -1 on failure
856 */
iser_post_send(struct ib_conn * ib_conn,struct iser_tx_desc * tx_desc)857 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc)
858 {
859 struct ib_send_wr *wr = &tx_desc->send_wr;
860 struct ib_send_wr *first_wr;
861 int ret;
862
863 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
864 tx_desc->dma_addr, ISER_HEADERS_LEN,
865 DMA_TO_DEVICE);
866
867 wr->next = NULL;
868 wr->wr_cqe = &tx_desc->cqe;
869 wr->sg_list = tx_desc->tx_sg;
870 wr->num_sge = tx_desc->num_sge;
871 wr->opcode = IB_WR_SEND;
872 wr->send_flags = IB_SEND_SIGNALED;
873
874 if (tx_desc->inv_wr.next)
875 first_wr = &tx_desc->inv_wr;
876 else if (tx_desc->reg_wr.wr.next)
877 first_wr = &tx_desc->reg_wr.wr;
878 else
879 first_wr = wr;
880
881 ret = ib_post_send(ib_conn->qp, first_wr, NULL);
882 if (unlikely(ret))
883 iser_err("ib_post_send failed, ret:%d opcode:%d\n",
884 ret, wr->opcode);
885
886 return ret;
887 }
888
iser_check_task_pi_status(struct iscsi_iser_task * iser_task,enum iser_data_dir cmd_dir,sector_t * sector)889 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
890 enum iser_data_dir cmd_dir, sector_t *sector)
891 {
892 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
893 struct iser_fr_desc *desc = reg->desc;
894 unsigned long sector_size = iser_task->sc->device->sector_size;
895 struct ib_mr_status mr_status;
896 int ret;
897
898 if (desc && desc->sig_protected) {
899 desc->sig_protected = false;
900 ret = ib_check_mr_status(desc->rsc.sig_mr,
901 IB_MR_CHECK_SIG_STATUS, &mr_status);
902 if (ret) {
903 iser_err("ib_check_mr_status failed, ret %d\n", ret);
904 /* Not a lot we can do, return ambiguous guard error */
905 *sector = 0;
906 return 0x1;
907 }
908
909 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
910 sector_t sector_off = mr_status.sig_err.sig_err_offset;
911
912 sector_div(sector_off, sector_size + 8);
913 *sector = scsi_get_sector(iser_task->sc) + sector_off;
914
915 iser_err("PI error found type %d at sector %llx "
916 "expected %x vs actual %x\n",
917 mr_status.sig_err.err_type,
918 (unsigned long long)*sector,
919 mr_status.sig_err.expected,
920 mr_status.sig_err.actual);
921
922 switch (mr_status.sig_err.err_type) {
923 case IB_SIG_BAD_GUARD:
924 return 0x1;
925 case IB_SIG_BAD_REFTAG:
926 return 0x3;
927 case IB_SIG_BAD_APPTAG:
928 return 0x2;
929 }
930 }
931 }
932
933 return 0;
934 }
935
iser_err_comp(struct ib_wc * wc,const char * type)936 void iser_err_comp(struct ib_wc *wc, const char *type)
937 {
938 if (wc->status != IB_WC_WR_FLUSH_ERR) {
939 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context);
940
941 iser_err("%s failure: %s (%d) vend_err %#x\n", type,
942 ib_wc_status_msg(wc->status), wc->status,
943 wc->vendor_err);
944
945 if (iser_conn->iscsi_conn)
946 iscsi_conn_failure(iser_conn->iscsi_conn,
947 ISCSI_ERR_CONN_FAILED);
948 } else {
949 iser_dbg("%s failure: %s (%d)\n", type,
950 ib_wc_status_msg(wc->status), wc->status);
951 }
952 }
953