2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
33 * $Id: iser_verbs.c 7051 2006-05-10 12:29:11Z ogerlitz $
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/delay.h>
39 #include <linux/version.h>
41 #include "iscsi_iser.h"
43 #define ISCSI_ISER_MAX_CONN 8
44 #define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \
45 ISER_QP_MAX_REQ_DTOS) * \
48 static void iser_cq_tasklet_fn(unsigned long data);
49 static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
51 static void iser_cq_event_callback(struct ib_event *cause, void *context)
53 iser_err("got cq event %d \n", cause->event);
56 static void iser_qp_event_callback(struct ib_event *cause, void *context)
58 iser_err("got qp event %d\n",cause->event);
62 * iser_create_device_ib_res - creates Protection Domain (PD), Completion
63 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
66 * returns 0 on success, -1 on failure
68 static int iser_create_device_ib_res(struct iser_device *device)
70 device->pd = ib_alloc_pd(device->ib_device);
71 if (IS_ERR(device->pd))
74 device->cq = ib_create_cq(device->ib_device,
76 iser_cq_event_callback,
79 if (IS_ERR(device->cq))
82 if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP))
85 tasklet_init(&device->cq_tasklet,
87 (unsigned long)device);
89 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE |
90 IB_ACCESS_REMOTE_WRITE |
91 IB_ACCESS_REMOTE_READ);
92 if (IS_ERR(device->mr))
98 tasklet_kill(&device->cq_tasklet);
100 ib_destroy_cq(device->cq);
102 ib_dealloc_pd(device->pd);
104 iser_err("failed to allocate an IB resource\n");
109 * iser_free_device_ib_res - destory/dealloc/dereg the DMA MR,
110 * CQ and PD created with the device associated with the adapator.
112 static void iser_free_device_ib_res(struct iser_device *device)
114 BUG_ON(device->mr == NULL);
116 tasklet_kill(&device->cq_tasklet);
118 (void)ib_dereg_mr(device->mr);
119 (void)ib_destroy_cq(device->cq);
120 (void)ib_dealloc_pd(device->pd);
128 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP)
130 * returns 0 on success, -1 on failure
132 static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
134 struct iser_device *device;
135 struct ib_qp_init_attr init_attr;
137 struct ib_fmr_pool_param params;
139 BUG_ON(ib_conn->device == NULL);
141 device = ib_conn->device;
143 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
144 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
146 if (!ib_conn->page_vec) {
150 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
152 params.page_shift = SHIFT_4K;
153 /* when the first/last SG element are not start/end *
154 * page aligned, the map whould be of N+1 pages */
155 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
156 /* make the pool size twice the max number of SCSI commands *
157 * the ML is expected to queue, watermark for unmap at 50% */
158 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2;
159 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX;
161 params.flush_function = NULL;
162 params.access = (IB_ACCESS_LOCAL_WRITE |
163 IB_ACCESS_REMOTE_WRITE |
164 IB_ACCESS_REMOTE_READ);
166 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms);
167 if (IS_ERR(ib_conn->fmr_pool)) {
168 ret = PTR_ERR(ib_conn->fmr_pool);
172 memset(&init_attr, 0, sizeof init_attr);
174 init_attr.event_handler = iser_qp_event_callback;
175 init_attr.qp_context = (void *)ib_conn;
176 init_attr.send_cq = device->cq;
177 init_attr.recv_cq = device->cq;
178 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
179 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
180 init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN;
181 init_attr.cap.max_recv_sge = 2;
182 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
183 init_attr.qp_type = IB_QPT_RC;
185 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
189 ib_conn->qp = ib_conn->cma_id->qp;
190 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
191 ib_conn, ib_conn->cma_id,
192 ib_conn->fmr_pool, ib_conn->cma_id->qp);
196 (void)ib_destroy_fmr_pool(ib_conn->fmr_pool);
198 kfree(ib_conn->page_vec);
200 iser_err("unable to alloc mem or create resource, err %d\n", ret);
205 * releases the FMR pool, QP and CMA ID objects, returns 0 on success,
208 static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
210 BUG_ON(ib_conn == NULL);
212 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n",
213 ib_conn, ib_conn->cma_id,
214 ib_conn->fmr_pool, ib_conn->qp);
216 /* qp is created only once both addr & route are resolved */
217 if (ib_conn->fmr_pool != NULL)
218 ib_destroy_fmr_pool(ib_conn->fmr_pool);
220 if (ib_conn->qp != NULL)
221 rdma_destroy_qp(ib_conn->cma_id);
223 if (ib_conn->cma_id != NULL)
224 rdma_destroy_id(ib_conn->cma_id);
226 ib_conn->fmr_pool = NULL;
228 ib_conn->cma_id = NULL;
229 kfree(ib_conn->page_vec);
235 * based on the resolved device node GUID see if there already allocated
236 * device for this device. If there's no such, create one.
239 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
241 struct list_head *p_list;
242 struct iser_device *device = NULL;
244 mutex_lock(&ig.device_list_mutex);
246 p_list = ig.device_list.next;
247 while (p_list != &ig.device_list) {
248 device = list_entry(p_list, struct iser_device, ig_list);
249 /* find if there's a match using the node GUID */
250 if (device->ib_device->node_guid == cma_id->device->node_guid)
254 if (device == NULL) {
255 device = kzalloc(sizeof *device, GFP_KERNEL);
258 /* assign this device to the device */
259 device->ib_device = cma_id->device;
260 /* init the device and link it into ig device list */
261 if (iser_create_device_ib_res(device)) {
266 list_add(&device->ig_list, &ig.device_list);
269 BUG_ON(device == NULL);
271 mutex_unlock(&ig.device_list_mutex);
275 /* if there's no demand for this device, release it */
276 static void iser_device_try_release(struct iser_device *device)
278 mutex_lock(&ig.device_list_mutex);
280 iser_err("device %p refcount %d\n",device,device->refcount);
281 if (!device->refcount) {
282 iser_free_device_ib_res(device);
283 list_del(&device->ig_list);
286 mutex_unlock(&ig.device_list_mutex);
289 int iser_conn_state_comp(struct iser_conn *ib_conn,
290 enum iser_ib_conn_state comp)
294 spin_lock_bh(&ib_conn->lock);
295 ret = (ib_conn->state == comp);
296 spin_unlock_bh(&ib_conn->lock);
300 static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
301 enum iser_ib_conn_state comp,
302 enum iser_ib_conn_state exch)
306 spin_lock_bh(&ib_conn->lock);
307 if ((ret = (ib_conn->state == comp)))
308 ib_conn->state = exch;
309 spin_unlock_bh(&ib_conn->lock);
314 * Frees all conn objects and deallocs conn descriptor
316 static void iser_conn_release(struct iser_conn *ib_conn)
318 struct iser_device *device = ib_conn->device;
320 BUG_ON(ib_conn->state != ISER_CONN_DOWN);
322 mutex_lock(&ig.connlist_mutex);
323 list_del(&ib_conn->conn_list);
324 mutex_unlock(&ig.connlist_mutex);
326 iser_free_ib_conn_res(ib_conn);
327 ib_conn->device = NULL;
328 /* on EVENT_ADDR_ERROR there's no device yet for this conn */
330 iser_device_try_release(device);
331 if (ib_conn->iser_conn)
332 ib_conn->iser_conn->ib_conn = NULL;
337 * triggers start of the disconnect procedures and wait for them to be done
339 void iser_conn_terminate(struct iser_conn *ib_conn)
343 /* change the ib conn state only if the conn is UP, however always call
344 * rdma_disconnect since this is the only way to cause the CMA to change
345 * the QP state to ERROR
348 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING);
349 err = rdma_disconnect(ib_conn->cma_id);
351 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
354 wait_event_interruptible(ib_conn->wait,
355 ib_conn->state == ISER_CONN_DOWN);
357 iser_conn_release(ib_conn);
360 static void iser_connect_error(struct rdma_cm_id *cma_id)
362 struct iser_conn *ib_conn;
363 ib_conn = (struct iser_conn *)cma_id->context;
365 ib_conn->state = ISER_CONN_DOWN;
366 wake_up_interruptible(&ib_conn->wait);
369 static void iser_addr_handler(struct rdma_cm_id *cma_id)
371 struct iser_device *device;
372 struct iser_conn *ib_conn;
375 device = iser_device_find_by_ib_device(cma_id);
376 ib_conn = (struct iser_conn *)cma_id->context;
377 ib_conn->device = device;
379 ret = rdma_resolve_route(cma_id, 1000);
381 iser_err("resolve route failed: %d\n", ret);
382 iser_connect_error(cma_id);
387 static void iser_route_handler(struct rdma_cm_id *cma_id)
389 struct rdma_conn_param conn_param;
392 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context);
396 iser_dbg("path.mtu is %d setting it to %d\n",
397 cma_id->route.path_rec->mtu, IB_MTU_1024);
399 /* we must set the MTU to 1024 as this is what the target is assuming */
400 if (cma_id->route.path_rec->mtu > IB_MTU_1024)
401 cma_id->route.path_rec->mtu = IB_MTU_1024;
403 memset(&conn_param, 0, sizeof conn_param);
404 conn_param.responder_resources = 4;
405 conn_param.initiator_depth = 1;
406 conn_param.retry_count = 7;
407 conn_param.rnr_retry_count = 6;
409 ret = rdma_connect(cma_id, &conn_param);
411 iser_err("failure connecting: %d\n", ret);
417 iser_connect_error(cma_id);
420 static void iser_connected_handler(struct rdma_cm_id *cma_id)
422 struct iser_conn *ib_conn;
424 ib_conn = (struct iser_conn *)cma_id->context;
425 ib_conn->state = ISER_CONN_UP;
426 wake_up_interruptible(&ib_conn->wait);
429 static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
431 struct iser_conn *ib_conn;
433 ib_conn = (struct iser_conn *)cma_id->context;
434 ib_conn->disc_evt_flag = 1;
436 /* getting here when the state is UP means that the conn is being *
437 * terminated asynchronously from the iSCSI layer's perspective. */
438 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
439 ISER_CONN_TERMINATING))
440 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
441 ISCSI_ERR_CONN_FAILED);
443 /* Complete the termination process if no posts are pending */
444 if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) &&
445 (atomic_read(&ib_conn->post_send_buf_count) == 0)) {
446 ib_conn->state = ISER_CONN_DOWN;
447 wake_up_interruptible(&ib_conn->wait);
451 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
455 iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id);
457 switch (event->event) {
458 case RDMA_CM_EVENT_ADDR_RESOLVED:
459 iser_addr_handler(cma_id);
461 case RDMA_CM_EVENT_ROUTE_RESOLVED:
462 iser_route_handler(cma_id);
464 case RDMA_CM_EVENT_ESTABLISHED:
465 iser_connected_handler(cma_id);
467 case RDMA_CM_EVENT_ADDR_ERROR:
468 case RDMA_CM_EVENT_ROUTE_ERROR:
469 case RDMA_CM_EVENT_CONNECT_ERROR:
470 case RDMA_CM_EVENT_UNREACHABLE:
471 case RDMA_CM_EVENT_REJECTED:
472 iser_err("event: %d, error: %d\n", event->event, event->status);
473 iser_connect_error(cma_id);
475 case RDMA_CM_EVENT_DISCONNECTED:
476 iser_disconnected_handler(cma_id);
478 case RDMA_CM_EVENT_DEVICE_REMOVAL:
481 case RDMA_CM_EVENT_CONNECT_RESPONSE:
484 case RDMA_CM_EVENT_CONNECT_REQUEST:
491 int iser_conn_init(struct iser_conn **ibconn)
493 struct iser_conn *ib_conn;
495 ib_conn = kzalloc(sizeof *ib_conn, GFP_KERNEL);
497 iser_err("can't alloc memory for struct iser_conn\n");
500 ib_conn->state = ISER_CONN_INIT;
501 init_waitqueue_head(&ib_conn->wait);
502 atomic_set(&ib_conn->post_recv_buf_count, 0);
503 atomic_set(&ib_conn->post_send_buf_count, 0);
504 INIT_LIST_HEAD(&ib_conn->conn_list);
505 spin_lock_init(&ib_conn->lock);
512 * starts the process of connecting to the target
513 * sleeps untill the connection is established or rejected
515 int iser_connect(struct iser_conn *ib_conn,
516 struct sockaddr_in *src_addr,
517 struct sockaddr_in *dst_addr,
520 struct sockaddr *src, *dst;
523 sprintf(ib_conn->name,"%d.%d.%d.%d:%d",
524 NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port);
526 /* the device is known only --after-- address resolution */
527 ib_conn->device = NULL;
529 iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n",
530 NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port);
532 ib_conn->state = ISER_CONN_PENDING;
534 ib_conn->cma_id = rdma_create_id(iser_cma_handler,
537 if (IS_ERR(ib_conn->cma_id)) {
538 err = PTR_ERR(ib_conn->cma_id);
539 iser_err("rdma_create_id failed: %d\n", err);
543 src = (struct sockaddr *)src_addr;
544 dst = (struct sockaddr *)dst_addr;
545 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000);
547 iser_err("rdma_resolve_addr failed: %d\n", err);
552 wait_event_interruptible(ib_conn->wait,
553 (ib_conn->state != ISER_CONN_PENDING));
555 if (ib_conn->state != ISER_CONN_UP) {
557 goto connect_failure;
561 mutex_lock(&ig.connlist_mutex);
562 list_add(&ib_conn->conn_list, &ig.connlist);
563 mutex_unlock(&ig.connlist_mutex);
567 ib_conn->cma_id = NULL;
569 ib_conn->state = ISER_CONN_DOWN;
571 iser_conn_release(ib_conn);
576 * iser_reg_page_vec - Register physical memory
578 * returns: 0 on success, errno code on failure
580 int iser_reg_page_vec(struct iser_conn *ib_conn,
581 struct iser_page_vec *page_vec,
582 struct iser_mem_reg *mem_reg)
584 struct ib_pool_fmr *mem;
589 page_list = page_vec->pages;
590 io_addr = page_list[0];
592 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
598 status = (int)PTR_ERR(mem);
599 iser_err("ib_fmr_pool_map_phys failed: %d\n", status);
603 mem_reg->lkey = mem->fmr->lkey;
604 mem_reg->rkey = mem->fmr->rkey;
605 mem_reg->len = page_vec->length * SIZE_4K;
606 mem_reg->va = io_addr;
608 mem_reg->mem_h = (void *)mem;
610 mem_reg->va += page_vec->offset;
611 mem_reg->len = page_vec->data_size;
613 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, "
614 "entry[0]: (0x%08lx,%ld)] -> "
615 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n",
616 page_vec, page_vec->length,
617 (unsigned long)page_vec->pages[0],
618 (unsigned long)page_vec->data_size,
619 (unsigned int)mem_reg->lkey, mem_reg->mem_h,
620 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len);
625 * Unregister (previosuly registered) memory.
627 void iser_unreg_mem(struct iser_mem_reg *reg)
631 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h);
633 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
635 iser_err("ib_fmr_pool_unmap failed %d\n", ret);
641 * iser_dto_to_iov - builds IOV from a dto descriptor
643 static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len)
647 struct iser_regd_buf *regd_buf;
649 if (dto->regd_vector_len > iov_len) {
650 iser_err("iov size %d too small for posting dto of len %d\n",
651 iov_len, dto->regd_vector_len);
655 for (i = 0; i < dto->regd_vector_len; i++) {
657 regd_buf = dto->regd[i];
659 sge->addr = regd_buf->reg.va;
660 sge->length = regd_buf->reg.len;
661 sge->lkey = regd_buf->reg.lkey;
663 if (dto->used_sz[i] > 0) /* Adjust size */
664 sge->length = dto->used_sz[i];
666 /* offset and length should not exceed the regd buf length */
667 if (sge->length + dto->offset[i] > regd_buf->reg.len) {
668 iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:"
669 "%ld in dto:0x%p [%d], va:0x%08lX\n",
670 (unsigned long)sge->length, dto->offset[i],
671 (unsigned long)regd_buf->reg.len, dto, i,
672 (unsigned long)sge->addr);
676 sge->addr += dto->offset[i]; /* Adjust offset */
681 * iser_post_recv - Posts a receive buffer.
683 * returns 0 on success, -1 on failure
685 int iser_post_recv(struct iser_desc *rx_desc)
687 int ib_ret, ret_val = 0;
688 struct ib_recv_wr recv_wr, *recv_wr_failed;
689 struct ib_sge iov[2];
690 struct iser_conn *ib_conn;
691 struct iser_dto *recv_dto = &rx_desc->dto;
694 ib_conn = recv_dto->ib_conn;
696 iser_dto_to_iov(recv_dto, iov, 2);
699 recv_wr.sg_list = iov;
700 recv_wr.num_sge = recv_dto->regd_vector_len;
701 recv_wr.wr_id = (unsigned long)rx_desc;
703 atomic_inc(&ib_conn->post_recv_buf_count);
704 ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed);
706 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
707 atomic_dec(&ib_conn->post_recv_buf_count);
715 * iser_start_send - Initiate a Send DTO operation
717 * returns 0 on success, -1 on failure
719 int iser_post_send(struct iser_desc *tx_desc)
721 int ib_ret, ret_val = 0;
722 struct ib_send_wr send_wr, *send_wr_failed;
723 struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN];
724 struct iser_conn *ib_conn;
725 struct iser_dto *dto = &tx_desc->dto;
727 ib_conn = dto->ib_conn;
729 iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN);
732 send_wr.wr_id = (unsigned long)tx_desc;
733 send_wr.sg_list = iov;
734 send_wr.num_sge = dto->regd_vector_len;
735 send_wr.opcode = IB_WR_SEND;
736 send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0;
738 atomic_inc(&ib_conn->post_send_buf_count);
740 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
742 iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n",
743 dto, dto->regd_vector_len);
744 iser_err("ib_post_send failed, ret:%d\n", ib_ret);
745 atomic_dec(&ib_conn->post_send_buf_count);
752 static void iser_handle_comp_error(struct iser_desc *desc)
754 struct iser_dto *dto = &desc->dto;
755 struct iser_conn *ib_conn = dto->ib_conn;
757 iser_dto_buffs_release(dto);
759 if (desc->type == ISCSI_RX) {
761 kmem_cache_free(ig.desc_cache, desc);
762 atomic_dec(&ib_conn->post_recv_buf_count);
763 } else { /* type is TX control/command/dataout */
764 if (desc->type == ISCSI_TX_DATAOUT)
765 kmem_cache_free(ig.desc_cache, desc);
766 atomic_dec(&ib_conn->post_send_buf_count);
769 if (atomic_read(&ib_conn->post_recv_buf_count) == 0 &&
770 atomic_read(&ib_conn->post_send_buf_count) == 0) {
771 /* getting here when the state is UP means that the conn is *
772 * being terminated asynchronously from the iSCSI layer's *
774 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
775 ISER_CONN_TERMINATING))
776 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
777 ISCSI_ERR_CONN_FAILED);
779 /* complete the termination process if disconnect event was delivered *
780 * note there are no more non completed posts to the QP */
781 if (ib_conn->disc_evt_flag) {
782 ib_conn->state = ISER_CONN_DOWN;
783 wake_up_interruptible(&ib_conn->wait);
788 static void iser_cq_tasklet_fn(unsigned long data)
790 struct iser_device *device = (struct iser_device *)data;
791 struct ib_cq *cq = device->cq;
793 struct iser_desc *desc;
794 unsigned long xfer_len;
796 while (ib_poll_cq(cq, 1, &wc) == 1) {
797 desc = (struct iser_desc *) (unsigned long) wc.wr_id;
798 BUG_ON(desc == NULL);
800 if (wc.status == IB_WC_SUCCESS) {
801 if (desc->type == ISCSI_RX) {
802 xfer_len = (unsigned long)wc.byte_len;
803 iser_rcv_completion(desc, xfer_len);
804 } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */
805 iser_snd_completion(desc);
807 iser_err("comp w. error op %d status %d\n",desc->type,wc.status);
808 iser_handle_comp_error(desc);
811 /* #warning "it is assumed here that arming CQ only once its empty" *
812 * " would not cause interrupts to be missed" */
813 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
816 static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
818 struct iser_device *device = (struct iser_device *)cq_context;
820 tasklet_schedule(&device->cq_tasklet);