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34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/slab.h>
37#include <linux/delay.h>
38
39#include "iscsi_iser.h"
40
41#define ISCSI_ISER_MAX_CONN 8
42#define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN)
43#define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN)
44
45static void iser_cq_tasklet_fn(unsigned long data);
46static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
47
48static void iser_cq_event_callback(struct ib_event *cause, void *context)
49{
50 iser_err("got cq event %d \n", cause->event);
51}
52
53static void iser_qp_event_callback(struct ib_event *cause, void *context)
54{
55 iser_err("got qp event %d\n",cause->event);
56}
57
58static void iser_event_handler(struct ib_event_handler *handler,
59 struct ib_event *event)
60{
61 iser_err("async event %d on device %s port %d\n", event->event,
62 event->device->name, event->element.port_num);
63}
64
65
66
67
68
69
70
71
72static int iser_create_device_ib_res(struct iser_device *device)
73{
74 int i, j;
75 struct iser_cq_desc *cq_desc;
76
77 device->cqs_used = min(ISER_MAX_CQ, device->ib_device->num_comp_vectors);
78 iser_info("using %d CQs, device %s supports %d vectors\n",
79 device->cqs_used, device->ib_device->name,
80 device->ib_device->num_comp_vectors);
81
82 device->cq_desc = kmalloc(sizeof(struct iser_cq_desc) * device->cqs_used,
83 GFP_KERNEL);
84 if (device->cq_desc == NULL)
85 goto cq_desc_err;
86 cq_desc = device->cq_desc;
87
88 device->pd = ib_alloc_pd(device->ib_device);
89 if (IS_ERR(device->pd))
90 goto pd_err;
91
92 for (i = 0; i < device->cqs_used; i++) {
93 cq_desc[i].device = device;
94 cq_desc[i].cq_index = i;
95
96 device->rx_cq[i] = ib_create_cq(device->ib_device,
97 iser_cq_callback,
98 iser_cq_event_callback,
99 (void *)&cq_desc[i],
100 ISER_MAX_RX_CQ_LEN, i);
101 if (IS_ERR(device->rx_cq[i]))
102 goto cq_err;
103
104 device->tx_cq[i] = ib_create_cq(device->ib_device,
105 NULL, iser_cq_event_callback,
106 (void *)&cq_desc[i],
107 ISER_MAX_TX_CQ_LEN, i);
108
109 if (IS_ERR(device->tx_cq[i]))
110 goto cq_err;
111
112 if (ib_req_notify_cq(device->rx_cq[i], IB_CQ_NEXT_COMP))
113 goto cq_err;
114
115 tasklet_init(&device->cq_tasklet[i],
116 iser_cq_tasklet_fn,
117 (unsigned long)&cq_desc[i]);
118 }
119
120 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE |
121 IB_ACCESS_REMOTE_WRITE |
122 IB_ACCESS_REMOTE_READ);
123 if (IS_ERR(device->mr))
124 goto dma_mr_err;
125
126 INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device,
127 iser_event_handler);
128 if (ib_register_event_handler(&device->event_handler))
129 goto handler_err;
130
131 return 0;
132
133handler_err:
134 ib_dereg_mr(device->mr);
135dma_mr_err:
136 for (j = 0; j < device->cqs_used; j++)
137 tasklet_kill(&device->cq_tasklet[j]);
138cq_err:
139 for (j = 0; j < i; j++) {
140 if (device->tx_cq[j])
141 ib_destroy_cq(device->tx_cq[j]);
142 if (device->rx_cq[j])
143 ib_destroy_cq(device->rx_cq[j]);
144 }
145 ib_dealloc_pd(device->pd);
146pd_err:
147 kfree(device->cq_desc);
148cq_desc_err:
149 iser_err("failed to allocate an IB resource\n");
150 return -1;
151}
152
153
154
155
156
157static void iser_free_device_ib_res(struct iser_device *device)
158{
159 int i;
160 BUG_ON(device->mr == NULL);
161
162 for (i = 0; i < device->cqs_used; i++) {
163 tasklet_kill(&device->cq_tasklet[i]);
164 (void)ib_destroy_cq(device->tx_cq[i]);
165 (void)ib_destroy_cq(device->rx_cq[i]);
166 device->tx_cq[i] = NULL;
167 device->rx_cq[i] = NULL;
168 }
169
170 (void)ib_unregister_event_handler(&device->event_handler);
171 (void)ib_dereg_mr(device->mr);
172 (void)ib_dealloc_pd(device->pd);
173
174 kfree(device->cq_desc);
175
176 device->mr = NULL;
177 device->pd = NULL;
178}
179
180
181
182
183
184
185static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
186{
187 struct iser_device *device;
188 struct ib_qp_init_attr init_attr;
189 int req_err, resp_err, ret = -ENOMEM;
190 struct ib_fmr_pool_param params;
191 int index, min_index = 0;
192
193 BUG_ON(ib_conn->device == NULL);
194
195 device = ib_conn->device;
196
197 ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
198 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
199 if (!ib_conn->login_buf)
200 goto out_err;
201
202 ib_conn->login_req_buf = ib_conn->login_buf;
203 ib_conn->login_resp_buf = ib_conn->login_buf + ISCSI_DEF_MAX_RECV_SEG_LEN;
204
205 ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device,
206 (void *)ib_conn->login_req_buf,
207 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
208
209 ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device,
210 (void *)ib_conn->login_resp_buf,
211 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
212
213 req_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_req_dma);
214 resp_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_resp_dma);
215
216 if (req_err || resp_err) {
217 if (req_err)
218 ib_conn->login_req_dma = 0;
219 if (resp_err)
220 ib_conn->login_resp_dma = 0;
221 goto out_err;
222 }
223
224 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
225 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
226 GFP_KERNEL);
227 if (!ib_conn->page_vec)
228 goto out_err;
229
230 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
231
232 params.page_shift = SHIFT_4K;
233
234
235 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
236
237
238 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2;
239 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX;
240 params.cache = 0;
241 params.flush_function = NULL;
242 params.access = (IB_ACCESS_LOCAL_WRITE |
243 IB_ACCESS_REMOTE_WRITE |
244 IB_ACCESS_REMOTE_READ);
245
246 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms);
247 ret = PTR_ERR(ib_conn->fmr_pool);
248 if (IS_ERR(ib_conn->fmr_pool) && ret != -ENOSYS) {
249 ib_conn->fmr_pool = NULL;
250 goto out_err;
251 } else if (ret == -ENOSYS) {
252 ib_conn->fmr_pool = NULL;
253 iser_warn("FMRs are not supported, using unaligned mode\n");
254 ret = 0;
255 }
256
257 memset(&init_attr, 0, sizeof init_attr);
258
259 mutex_lock(&ig.connlist_mutex);
260
261 for (index = 0; index < device->cqs_used; index++)
262 if (device->cq_active_qps[index] <
263 device->cq_active_qps[min_index])
264 min_index = index;
265 device->cq_active_qps[min_index]++;
266 mutex_unlock(&ig.connlist_mutex);
267 iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn);
268
269 init_attr.event_handler = iser_qp_event_callback;
270 init_attr.qp_context = (void *)ib_conn;
271 init_attr.send_cq = device->tx_cq[min_index];
272 init_attr.recv_cq = device->rx_cq[min_index];
273 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
274 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
275 init_attr.cap.max_send_sge = 2;
276 init_attr.cap.max_recv_sge = 1;
277 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
278 init_attr.qp_type = IB_QPT_RC;
279
280 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
281 if (ret)
282 goto out_err;
283
284 ib_conn->qp = ib_conn->cma_id->qp;
285 iser_info("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
286 ib_conn, ib_conn->cma_id,
287 ib_conn->fmr_pool, ib_conn->cma_id->qp);
288 return ret;
289
290out_err:
291 iser_err("unable to alloc mem or create resource, err %d\n", ret);
292 return ret;
293}
294
295
296
297
298
299static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
300{
301 int cq_index;
302 BUG_ON(ib_conn == NULL);
303
304 iser_info("freeing conn %p cma_id %p fmr pool %p qp %p\n",
305 ib_conn, ib_conn->cma_id,
306 ib_conn->fmr_pool, ib_conn->qp);
307
308
309 if (ib_conn->fmr_pool != NULL)
310 ib_destroy_fmr_pool(ib_conn->fmr_pool);
311
312 if (ib_conn->qp != NULL) {
313 cq_index = ((struct iser_cq_desc *)ib_conn->qp->recv_cq->cq_context)->cq_index;
314 ib_conn->device->cq_active_qps[cq_index]--;
315
316 rdma_destroy_qp(ib_conn->cma_id);
317 }
318
319 ib_conn->fmr_pool = NULL;
320 ib_conn->qp = NULL;
321 kfree(ib_conn->page_vec);
322
323 if (ib_conn->login_buf) {
324 if (ib_conn->login_req_dma)
325 ib_dma_unmap_single(ib_conn->device->ib_device,
326 ib_conn->login_req_dma,
327 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
328 if (ib_conn->login_resp_dma)
329 ib_dma_unmap_single(ib_conn->device->ib_device,
330 ib_conn->login_resp_dma,
331 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
332 kfree(ib_conn->login_buf);
333 }
334
335 return 0;
336}
337
338
339
340
341
342static
343struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
344{
345 struct iser_device *device;
346
347 mutex_lock(&ig.device_list_mutex);
348
349 list_for_each_entry(device, &ig.device_list, ig_list)
350
351 if (device->ib_device->node_guid == cma_id->device->node_guid)
352 goto inc_refcnt;
353
354 device = kzalloc(sizeof *device, GFP_KERNEL);
355 if (device == NULL)
356 goto out;
357
358
359 device->ib_device = cma_id->device;
360
361 if (iser_create_device_ib_res(device)) {
362 kfree(device);
363 device = NULL;
364 goto out;
365 }
366 list_add(&device->ig_list, &ig.device_list);
367
368inc_refcnt:
369 device->refcount++;
370out:
371 mutex_unlock(&ig.device_list_mutex);
372 return device;
373}
374
375
376static void iser_device_try_release(struct iser_device *device)
377{
378 mutex_lock(&ig.device_list_mutex);
379 device->refcount--;
380 iser_info("device %p refcount %d\n", device, device->refcount);
381 if (!device->refcount) {
382 iser_free_device_ib_res(device);
383 list_del(&device->ig_list);
384 kfree(device);
385 }
386 mutex_unlock(&ig.device_list_mutex);
387}
388
389static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
390 enum iser_ib_conn_state comp,
391 enum iser_ib_conn_state exch)
392{
393 int ret;
394
395 spin_lock_bh(&ib_conn->lock);
396 if ((ret = (ib_conn->state == comp)))
397 ib_conn->state = exch;
398 spin_unlock_bh(&ib_conn->lock);
399 return ret;
400}
401
402
403
404
405static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id)
406{
407 struct iser_device *device = ib_conn->device;
408
409 BUG_ON(ib_conn->state != ISER_CONN_DOWN);
410
411 mutex_lock(&ig.connlist_mutex);
412 list_del(&ib_conn->conn_list);
413 mutex_unlock(&ig.connlist_mutex);
414 iser_free_rx_descriptors(ib_conn);
415 iser_free_ib_conn_res(ib_conn);
416 ib_conn->device = NULL;
417
418 if (device != NULL)
419 iser_device_try_release(device);
420
421 if (ib_conn->cma_id != NULL && can_destroy_id) {
422 rdma_destroy_id(ib_conn->cma_id);
423 ib_conn->cma_id = NULL;
424 }
425 iscsi_destroy_endpoint(ib_conn->ep);
426}
427
428void iser_conn_get(struct iser_conn *ib_conn)
429{
430 atomic_inc(&ib_conn->refcount);
431}
432
433int iser_conn_put(struct iser_conn *ib_conn, int can_destroy_id)
434{
435 if (atomic_dec_and_test(&ib_conn->refcount)) {
436 iser_conn_release(ib_conn, can_destroy_id);
437 return 1;
438 }
439 return 0;
440}
441
442
443
444
445void iser_conn_terminate(struct iser_conn *ib_conn)
446{
447 int err = 0;
448
449
450
451
452
453
454 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING);
455 err = rdma_disconnect(ib_conn->cma_id);
456 if (err)
457 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
458 ib_conn,err);
459
460 wait_event_interruptible(ib_conn->wait,
461 ib_conn->state == ISER_CONN_DOWN);
462
463 iser_conn_put(ib_conn, 1);
464}
465
466static int iser_connect_error(struct rdma_cm_id *cma_id)
467{
468 struct iser_conn *ib_conn;
469 ib_conn = (struct iser_conn *)cma_id->context;
470
471 ib_conn->state = ISER_CONN_DOWN;
472 wake_up_interruptible(&ib_conn->wait);
473 return iser_conn_put(ib_conn, 0);
474}
475
476static int iser_addr_handler(struct rdma_cm_id *cma_id)
477{
478 struct iser_device *device;
479 struct iser_conn *ib_conn;
480 int ret;
481
482 device = iser_device_find_by_ib_device(cma_id);
483 if (!device) {
484 iser_err("device lookup/creation failed\n");
485 return iser_connect_error(cma_id);
486 }
487
488 ib_conn = (struct iser_conn *)cma_id->context;
489 ib_conn->device = device;
490
491 ret = rdma_resolve_route(cma_id, 1000);
492 if (ret) {
493 iser_err("resolve route failed: %d\n", ret);
494 return iser_connect_error(cma_id);
495 }
496
497 return 0;
498}
499
500static int iser_route_handler(struct rdma_cm_id *cma_id)
501{
502 struct rdma_conn_param conn_param;
503 int ret;
504 struct iser_cm_hdr req_hdr;
505
506 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context);
507 if (ret)
508 goto failure;
509
510 memset(&conn_param, 0, sizeof conn_param);
511 conn_param.responder_resources = 4;
512 conn_param.initiator_depth = 1;
513 conn_param.retry_count = 7;
514 conn_param.rnr_retry_count = 6;
515
516 memset(&req_hdr, 0, sizeof(req_hdr));
517 req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED |
518 ISER_SEND_W_INV_NOT_SUPPORTED);
519 conn_param.private_data = (void *)&req_hdr;
520 conn_param.private_data_len = sizeof(struct iser_cm_hdr);
521
522 ret = rdma_connect(cma_id, &conn_param);
523 if (ret) {
524 iser_err("failure connecting: %d\n", ret);
525 goto failure;
526 }
527
528 return 0;
529failure:
530 return iser_connect_error(cma_id);
531}
532
533static void iser_connected_handler(struct rdma_cm_id *cma_id)
534{
535 struct iser_conn *ib_conn;
536
537 ib_conn = (struct iser_conn *)cma_id->context;
538 ib_conn->state = ISER_CONN_UP;
539 wake_up_interruptible(&ib_conn->wait);
540}
541
542static int iser_disconnected_handler(struct rdma_cm_id *cma_id)
543{
544 struct iser_conn *ib_conn;
545 int ret;
546
547 ib_conn = (struct iser_conn *)cma_id->context;
548
549
550
551 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
552 ISER_CONN_TERMINATING))
553 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
554 ISCSI_ERR_CONN_FAILED);
555
556
557 if (ib_conn->post_recv_buf_count == 0 &&
558 (atomic_read(&ib_conn->post_send_buf_count) == 0)) {
559 ib_conn->state = ISER_CONN_DOWN;
560 wake_up_interruptible(&ib_conn->wait);
561 }
562
563 ret = iser_conn_put(ib_conn, 0);
564 return ret;
565}
566
567static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
568{
569 int ret = 0;
570
571 iser_info("event %d status %d conn %p id %p\n",
572 event->event, event->status, cma_id->context, cma_id);
573
574 switch (event->event) {
575 case RDMA_CM_EVENT_ADDR_RESOLVED:
576 ret = iser_addr_handler(cma_id);
577 break;
578 case RDMA_CM_EVENT_ROUTE_RESOLVED:
579 ret = iser_route_handler(cma_id);
580 break;
581 case RDMA_CM_EVENT_ESTABLISHED:
582 iser_connected_handler(cma_id);
583 break;
584 case RDMA_CM_EVENT_ADDR_ERROR:
585 case RDMA_CM_EVENT_ROUTE_ERROR:
586 case RDMA_CM_EVENT_CONNECT_ERROR:
587 case RDMA_CM_EVENT_UNREACHABLE:
588 case RDMA_CM_EVENT_REJECTED:
589 ret = iser_connect_error(cma_id);
590 break;
591 case RDMA_CM_EVENT_DISCONNECTED:
592 case RDMA_CM_EVENT_DEVICE_REMOVAL:
593 case RDMA_CM_EVENT_ADDR_CHANGE:
594 ret = iser_disconnected_handler(cma_id);
595 break;
596 default:
597 iser_err("Unexpected RDMA CM event (%d)\n", event->event);
598 break;
599 }
600 return ret;
601}
602
603void iser_conn_init(struct iser_conn *ib_conn)
604{
605 ib_conn->state = ISER_CONN_INIT;
606 init_waitqueue_head(&ib_conn->wait);
607 ib_conn->post_recv_buf_count = 0;
608 atomic_set(&ib_conn->post_send_buf_count, 0);
609 atomic_set(&ib_conn->refcount, 1);
610 INIT_LIST_HEAD(&ib_conn->conn_list);
611 spin_lock_init(&ib_conn->lock);
612}
613
614
615
616
617
618int iser_connect(struct iser_conn *ib_conn,
619 struct sockaddr_in *src_addr,
620 struct sockaddr_in *dst_addr,
621 int non_blocking)
622{
623 struct sockaddr *src, *dst;
624 int err = 0;
625
626 sprintf(ib_conn->name, "%pI4:%d",
627 &dst_addr->sin_addr.s_addr, dst_addr->sin_port);
628
629
630 ib_conn->device = NULL;
631
632 iser_info("connecting to: %pI4, port 0x%x\n",
633 &dst_addr->sin_addr, dst_addr->sin_port);
634
635 ib_conn->state = ISER_CONN_PENDING;
636
637 iser_conn_get(ib_conn);
638 ib_conn->cma_id = rdma_create_id(iser_cma_handler,
639 (void *)ib_conn,
640 RDMA_PS_TCP, IB_QPT_RC);
641 if (IS_ERR(ib_conn->cma_id)) {
642 err = PTR_ERR(ib_conn->cma_id);
643 iser_err("rdma_create_id failed: %d\n", err);
644 goto id_failure;
645 }
646
647 src = (struct sockaddr *)src_addr;
648 dst = (struct sockaddr *)dst_addr;
649 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000);
650 if (err) {
651 iser_err("rdma_resolve_addr failed: %d\n", err);
652 goto addr_failure;
653 }
654
655 if (!non_blocking) {
656 wait_event_interruptible(ib_conn->wait,
657 (ib_conn->state != ISER_CONN_PENDING));
658
659 if (ib_conn->state != ISER_CONN_UP) {
660 err = -EIO;
661 goto connect_failure;
662 }
663 }
664
665 mutex_lock(&ig.connlist_mutex);
666 list_add(&ib_conn->conn_list, &ig.connlist);
667 mutex_unlock(&ig.connlist_mutex);
668 return 0;
669
670id_failure:
671 ib_conn->cma_id = NULL;
672addr_failure:
673 ib_conn->state = ISER_CONN_DOWN;
674 iser_conn_put(ib_conn, 1);
675connect_failure:
676 iser_conn_put(ib_conn, 1);
677 return err;
678}
679
680
681
682
683
684
685int iser_reg_page_vec(struct iser_conn *ib_conn,
686 struct iser_page_vec *page_vec,
687 struct iser_mem_reg *mem_reg)
688{
689 struct ib_pool_fmr *mem;
690 u64 io_addr;
691 u64 *page_list;
692 int status;
693
694 page_list = page_vec->pages;
695 io_addr = page_list[0];
696
697 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
698 page_list,
699 page_vec->length,
700 io_addr);
701
702 if (IS_ERR(mem)) {
703 status = (int)PTR_ERR(mem);
704 iser_err("ib_fmr_pool_map_phys failed: %d\n", status);
705 return status;
706 }
707
708 mem_reg->lkey = mem->fmr->lkey;
709 mem_reg->rkey = mem->fmr->rkey;
710 mem_reg->len = page_vec->length * SIZE_4K;
711 mem_reg->va = io_addr;
712 mem_reg->is_fmr = 1;
713 mem_reg->mem_h = (void *)mem;
714
715 mem_reg->va += page_vec->offset;
716 mem_reg->len = page_vec->data_size;
717
718 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, "
719 "entry[0]: (0x%08lx,%ld)] -> "
720 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n",
721 page_vec, page_vec->length,
722 (unsigned long)page_vec->pages[0],
723 (unsigned long)page_vec->data_size,
724 (unsigned int)mem_reg->lkey, mem_reg->mem_h,
725 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len);
726 return 0;
727}
728
729
730
731
732void iser_unreg_mem(struct iser_mem_reg *reg)
733{
734 int ret;
735
736 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h);
737
738 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
739 if (ret)
740 iser_err("ib_fmr_pool_unmap failed %d\n", ret);
741
742 reg->mem_h = NULL;
743}
744
745int iser_post_recvl(struct iser_conn *ib_conn)
746{
747 struct ib_recv_wr rx_wr, *rx_wr_failed;
748 struct ib_sge sge;
749 int ib_ret;
750
751 sge.addr = ib_conn->login_resp_dma;
752 sge.length = ISER_RX_LOGIN_SIZE;
753 sge.lkey = ib_conn->device->mr->lkey;
754
755 rx_wr.wr_id = (unsigned long)ib_conn->login_resp_buf;
756 rx_wr.sg_list = &sge;
757 rx_wr.num_sge = 1;
758 rx_wr.next = NULL;
759
760 ib_conn->post_recv_buf_count++;
761 ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed);
762 if (ib_ret) {
763 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
764 ib_conn->post_recv_buf_count--;
765 }
766 return ib_ret;
767}
768
769int iser_post_recvm(struct iser_conn *ib_conn, int count)
770{
771 struct ib_recv_wr *rx_wr, *rx_wr_failed;
772 int i, ib_ret;
773 unsigned int my_rx_head = ib_conn->rx_desc_head;
774 struct iser_rx_desc *rx_desc;
775
776 for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
777 rx_desc = &ib_conn->rx_descs[my_rx_head];
778 rx_wr->wr_id = (unsigned long)rx_desc;
779 rx_wr->sg_list = &rx_desc->rx_sg;
780 rx_wr->num_sge = 1;
781 rx_wr->next = rx_wr + 1;
782 my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1);
783 }
784
785 rx_wr--;
786 rx_wr->next = NULL;
787
788 ib_conn->post_recv_buf_count += count;
789 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed);
790 if (ib_ret) {
791 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
792 ib_conn->post_recv_buf_count -= count;
793 } else
794 ib_conn->rx_desc_head = my_rx_head;
795 return ib_ret;
796}
797
798
799
800
801
802
803
804int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc)
805{
806 int ib_ret;
807 struct ib_send_wr send_wr, *send_wr_failed;
808
809 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
810 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
811
812 send_wr.next = NULL;
813 send_wr.wr_id = (unsigned long)tx_desc;
814 send_wr.sg_list = tx_desc->tx_sg;
815 send_wr.num_sge = tx_desc->num_sge;
816 send_wr.opcode = IB_WR_SEND;
817 send_wr.send_flags = IB_SEND_SIGNALED;
818
819 atomic_inc(&ib_conn->post_send_buf_count);
820
821 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
822 if (ib_ret) {
823 iser_err("ib_post_send failed, ret:%d\n", ib_ret);
824 atomic_dec(&ib_conn->post_send_buf_count);
825 }
826 return ib_ret;
827}
828
829static void iser_handle_comp_error(struct iser_tx_desc *desc,
830 struct iser_conn *ib_conn)
831{
832 if (desc && desc->type == ISCSI_TX_DATAOUT)
833 kmem_cache_free(ig.desc_cache, desc);
834
835 if (ib_conn->post_recv_buf_count == 0 &&
836 atomic_read(&ib_conn->post_send_buf_count) == 0) {
837
838
839
840 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
841 ISER_CONN_TERMINATING))
842 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
843 ISCSI_ERR_CONN_FAILED);
844
845
846
847 ib_conn->state = ISER_CONN_DOWN;
848 wake_up_interruptible(&ib_conn->wait);
849 }
850}
851
852static int iser_drain_tx_cq(struct iser_device *device, int cq_index)
853{
854 struct ib_cq *cq = device->tx_cq[cq_index];
855 struct ib_wc wc;
856 struct iser_tx_desc *tx_desc;
857 struct iser_conn *ib_conn;
858 int completed_tx = 0;
859
860 while (ib_poll_cq(cq, 1, &wc) == 1) {
861 tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id;
862 ib_conn = wc.qp->qp_context;
863 if (wc.status == IB_WC_SUCCESS) {
864 if (wc.opcode == IB_WC_SEND)
865 iser_snd_completion(tx_desc, ib_conn);
866 else
867 iser_err("expected opcode %d got %d\n",
868 IB_WC_SEND, wc.opcode);
869 } else {
870 iser_err("tx id %llx status %d vend_err %x\n",
871 wc.wr_id, wc.status, wc.vendor_err);
872 atomic_dec(&ib_conn->post_send_buf_count);
873 iser_handle_comp_error(tx_desc, ib_conn);
874 }
875 completed_tx++;
876 }
877 return completed_tx;
878}
879
880
881static void iser_cq_tasklet_fn(unsigned long data)
882{
883 struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)data;
884 struct iser_device *device = cq_desc->device;
885 int cq_index = cq_desc->cq_index;
886 struct ib_cq *cq = device->rx_cq[cq_index];
887 struct ib_wc wc;
888 struct iser_rx_desc *desc;
889 unsigned long xfer_len;
890 struct iser_conn *ib_conn;
891 int completed_tx, completed_rx;
892 completed_tx = completed_rx = 0;
893
894 while (ib_poll_cq(cq, 1, &wc) == 1) {
895 desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id;
896 BUG_ON(desc == NULL);
897 ib_conn = wc.qp->qp_context;
898 if (wc.status == IB_WC_SUCCESS) {
899 if (wc.opcode == IB_WC_RECV) {
900 xfer_len = (unsigned long)wc.byte_len;
901 iser_rcv_completion(desc, xfer_len, ib_conn);
902 } else
903 iser_err("expected opcode %d got %d\n",
904 IB_WC_RECV, wc.opcode);
905 } else {
906 if (wc.status != IB_WC_WR_FLUSH_ERR)
907 iser_err("rx id %llx status %d vend_err %x\n",
908 wc.wr_id, wc.status, wc.vendor_err);
909 ib_conn->post_recv_buf_count--;
910 iser_handle_comp_error(NULL, ib_conn);
911 }
912 completed_rx++;
913 if (!(completed_rx & 63))
914 completed_tx += iser_drain_tx_cq(device, cq_index);
915 }
916
917
918 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
919
920 completed_tx += iser_drain_tx_cq(device, cq_index);
921 iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx);
922}
923
924static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
925{
926 struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)cq_context;
927 struct iser_device *device = cq_desc->device;
928 int cq_index = cq_desc->cq_index;
929
930 tasklet_schedule(&device->cq_tasklet[cq_index]);
931}
932