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 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/delay.h>
36 #include <linux/version.h>
38 #include "iscsi_iser.h"
40 #define ISCSI_ISER_MAX_CONN 8
41 #define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \
42 ISER_QP_MAX_REQ_DTOS) * \
45 static void iser_cq_tasklet_fn(unsigned long data);
46 static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
48 static void iser_cq_event_callback(struct ib_event *cause, void *context)
50 iser_err("got cq event %d \n", cause->event);
53 static void iser_qp_event_callback(struct ib_event *cause, void *context)
55 iser_err("got qp event %d\n",cause->event);
59 * iser_create_device_ib_res - creates Protection Domain (PD), Completion
60 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
63 * returns 0 on success, -1 on failure
65 static int iser_create_device_ib_res(struct iser_device *device)
67 device->pd = ib_alloc_pd(device->ib_device);
68 if (IS_ERR(device->pd))
71 device->cq = ib_create_cq(device->ib_device,
73 iser_cq_event_callback,
76 if (IS_ERR(device->cq))
79 if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP))
82 tasklet_init(&device->cq_tasklet,
84 (unsigned long)device);
86 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE |
87 IB_ACCESS_REMOTE_WRITE |
88 IB_ACCESS_REMOTE_READ);
89 if (IS_ERR(device->mr))
95 tasklet_kill(&device->cq_tasklet);
97 ib_destroy_cq(device->cq);
99 ib_dealloc_pd(device->pd);
101 iser_err("failed to allocate an IB resource\n");
106 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
107 * CQ and PD created with the device associated with the adapator.
109 static void iser_free_device_ib_res(struct iser_device *device)
111 BUG_ON(device->mr == NULL);
113 tasklet_kill(&device->cq_tasklet);
115 (void)ib_dereg_mr(device->mr);
116 (void)ib_destroy_cq(device->cq);
117 (void)ib_dealloc_pd(device->pd);
125 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP)
127 * returns 0 on success, -1 on failure
129 static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
131 struct iser_device *device;
132 struct ib_qp_init_attr init_attr;
134 struct ib_fmr_pool_param params;
136 BUG_ON(ib_conn->device == NULL);
138 device = ib_conn->device;
140 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
141 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
143 if (!ib_conn->page_vec) {
147 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
149 params.page_shift = SHIFT_4K;
150 /* when the first/last SG element are not start/end *
151 * page aligned, the map whould be of N+1 pages */
152 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
153 /* make the pool size twice the max number of SCSI commands *
154 * the ML is expected to queue, watermark for unmap at 50% */
155 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2;
156 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX;
158 params.flush_function = NULL;
159 params.access = (IB_ACCESS_LOCAL_WRITE |
160 IB_ACCESS_REMOTE_WRITE |
161 IB_ACCESS_REMOTE_READ);
163 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms);
164 if (IS_ERR(ib_conn->fmr_pool)) {
165 ret = PTR_ERR(ib_conn->fmr_pool);
169 memset(&init_attr, 0, sizeof init_attr);
171 init_attr.event_handler = iser_qp_event_callback;
172 init_attr.qp_context = (void *)ib_conn;
173 init_attr.send_cq = device->cq;
174 init_attr.recv_cq = device->cq;
175 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
176 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
177 init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN;
178 init_attr.cap.max_recv_sge = 2;
179 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
180 init_attr.qp_type = IB_QPT_RC;
182 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
186 ib_conn->qp = ib_conn->cma_id->qp;
187 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
188 ib_conn, ib_conn->cma_id,
189 ib_conn->fmr_pool, ib_conn->cma_id->qp);
193 (void)ib_destroy_fmr_pool(ib_conn->fmr_pool);
195 kfree(ib_conn->page_vec);
197 iser_err("unable to alloc mem or create resource, err %d\n", ret);
202 * releases the FMR pool, QP and CMA ID objects, returns 0 on success,
205 static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
207 BUG_ON(ib_conn == NULL);
209 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n",
210 ib_conn, ib_conn->cma_id,
211 ib_conn->fmr_pool, ib_conn->qp);
213 /* qp is created only once both addr & route are resolved */
214 if (ib_conn->fmr_pool != NULL)
215 ib_destroy_fmr_pool(ib_conn->fmr_pool);
217 if (ib_conn->qp != NULL)
218 rdma_destroy_qp(ib_conn->cma_id);
220 if (ib_conn->cma_id != NULL)
221 rdma_destroy_id(ib_conn->cma_id);
223 ib_conn->fmr_pool = NULL;
225 ib_conn->cma_id = NULL;
226 kfree(ib_conn->page_vec);
232 * based on the resolved device node GUID see if there already allocated
233 * device for this device. If there's no such, create one.
236 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
238 struct iser_device *device;
240 mutex_lock(&ig.device_list_mutex);
242 list_for_each_entry(device, &ig.device_list, ig_list)
243 /* find if there's a match using the node GUID */
244 if (device->ib_device->node_guid == cma_id->device->node_guid)
247 device = kzalloc(sizeof *device, GFP_KERNEL);
251 /* assign this device to the device */
252 device->ib_device = cma_id->device;
253 /* init the device and link it into ig device list */
254 if (iser_create_device_ib_res(device)) {
259 list_add(&device->ig_list, &ig.device_list);
264 mutex_unlock(&ig.device_list_mutex);
268 /* if there's no demand for this device, release it */
269 static void iser_device_try_release(struct iser_device *device)
271 mutex_lock(&ig.device_list_mutex);
273 iser_err("device %p refcount %d\n",device,device->refcount);
274 if (!device->refcount) {
275 iser_free_device_ib_res(device);
276 list_del(&device->ig_list);
279 mutex_unlock(&ig.device_list_mutex);
282 int iser_conn_state_comp(struct iser_conn *ib_conn,
283 enum iser_ib_conn_state comp)
287 spin_lock_bh(&ib_conn->lock);
288 ret = (ib_conn->state == comp);
289 spin_unlock_bh(&ib_conn->lock);
293 static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
294 enum iser_ib_conn_state comp,
295 enum iser_ib_conn_state exch)
299 spin_lock_bh(&ib_conn->lock);
300 if ((ret = (ib_conn->state == comp)))
301 ib_conn->state = exch;
302 spin_unlock_bh(&ib_conn->lock);
307 * Frees all conn objects and deallocs conn descriptor
309 static void iser_conn_release(struct iser_conn *ib_conn)
311 struct iser_device *device = ib_conn->device;
313 BUG_ON(ib_conn->state != ISER_CONN_DOWN);
315 mutex_lock(&ig.connlist_mutex);
316 list_del(&ib_conn->conn_list);
317 mutex_unlock(&ig.connlist_mutex);
319 iser_free_ib_conn_res(ib_conn);
320 ib_conn->device = NULL;
321 /* on EVENT_ADDR_ERROR there's no device yet for this conn */
323 iser_device_try_release(device);
324 if (ib_conn->iser_conn)
325 ib_conn->iser_conn->ib_conn = NULL;
326 iscsi_destroy_endpoint(ib_conn->ep);
329 void iser_conn_get(struct iser_conn *ib_conn)
331 atomic_inc(&ib_conn->refcount);
334 void iser_conn_put(struct iser_conn *ib_conn)
336 if (atomic_dec_and_test(&ib_conn->refcount))
337 iser_conn_release(ib_conn);
341 * triggers start of the disconnect procedures and wait for them to be done
343 void iser_conn_terminate(struct iser_conn *ib_conn)
347 /* change the ib conn state only if the conn is UP, however always call
348 * rdma_disconnect since this is the only way to cause the CMA to change
349 * the QP state to ERROR
352 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING);
353 err = rdma_disconnect(ib_conn->cma_id);
355 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
358 wait_event_interruptible(ib_conn->wait,
359 ib_conn->state == ISER_CONN_DOWN);
361 iser_conn_put(ib_conn);
364 static void iser_connect_error(struct rdma_cm_id *cma_id)
366 struct iser_conn *ib_conn;
367 ib_conn = (struct iser_conn *)cma_id->context;
369 ib_conn->state = ISER_CONN_DOWN;
370 wake_up_interruptible(&ib_conn->wait);
373 static void iser_addr_handler(struct rdma_cm_id *cma_id)
375 struct iser_device *device;
376 struct iser_conn *ib_conn;
379 device = iser_device_find_by_ib_device(cma_id);
381 iser_err("device lookup/creation failed\n");
382 iser_connect_error(cma_id);
386 ib_conn = (struct iser_conn *)cma_id->context;
387 ib_conn->device = device;
389 ret = rdma_resolve_route(cma_id, 1000);
391 iser_err("resolve route failed: %d\n", ret);
392 iser_connect_error(cma_id);
396 static void iser_route_handler(struct rdma_cm_id *cma_id)
398 struct rdma_conn_param conn_param;
401 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context);
405 iser_dbg("path.mtu is %d setting it to %d\n",
406 cma_id->route.path_rec->mtu, IB_MTU_1024);
408 /* we must set the MTU to 1024 as this is what the target is assuming */
409 if (cma_id->route.path_rec->mtu > IB_MTU_1024)
410 cma_id->route.path_rec->mtu = IB_MTU_1024;
412 memset(&conn_param, 0, sizeof conn_param);
413 conn_param.responder_resources = 4;
414 conn_param.initiator_depth = 1;
415 conn_param.retry_count = 7;
416 conn_param.rnr_retry_count = 6;
418 ret = rdma_connect(cma_id, &conn_param);
420 iser_err("failure connecting: %d\n", ret);
426 iser_connect_error(cma_id);
429 static void iser_connected_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->state = ISER_CONN_UP;
435 wake_up_interruptible(&ib_conn->wait);
438 static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
440 struct iser_conn *ib_conn;
442 ib_conn = (struct iser_conn *)cma_id->context;
443 ib_conn->disc_evt_flag = 1;
445 /* getting here when the state is UP means that the conn is being *
446 * terminated asynchronously from the iSCSI layer's perspective. */
447 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
448 ISER_CONN_TERMINATING))
449 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
450 ISCSI_ERR_CONN_FAILED);
452 /* Complete the termination process if no posts are pending */
453 if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) &&
454 (atomic_read(&ib_conn->post_send_buf_count) == 0)) {
455 ib_conn->state = ISER_CONN_DOWN;
456 wake_up_interruptible(&ib_conn->wait);
460 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
464 iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id);
466 switch (event->event) {
467 case RDMA_CM_EVENT_ADDR_RESOLVED:
468 iser_addr_handler(cma_id);
470 case RDMA_CM_EVENT_ROUTE_RESOLVED:
471 iser_route_handler(cma_id);
473 case RDMA_CM_EVENT_ESTABLISHED:
474 iser_connected_handler(cma_id);
476 case RDMA_CM_EVENT_ADDR_ERROR:
477 case RDMA_CM_EVENT_ROUTE_ERROR:
478 case RDMA_CM_EVENT_CONNECT_ERROR:
479 case RDMA_CM_EVENT_UNREACHABLE:
480 case RDMA_CM_EVENT_REJECTED:
481 iser_err("event: %d, error: %d\n", event->event, event->status);
482 iser_connect_error(cma_id);
484 case RDMA_CM_EVENT_DISCONNECTED:
485 case RDMA_CM_EVENT_DEVICE_REMOVAL:
486 case RDMA_CM_EVENT_ADDR_CHANGE:
487 iser_disconnected_handler(cma_id);
490 iser_err("Unexpected RDMA CM event (%d)\n", event->event);
496 void iser_conn_init(struct iser_conn *ib_conn)
498 ib_conn->state = ISER_CONN_INIT;
499 init_waitqueue_head(&ib_conn->wait);
500 atomic_set(&ib_conn->post_recv_buf_count, 0);
501 atomic_set(&ib_conn->post_send_buf_count, 0);
502 atomic_set(&ib_conn->refcount, 1);
503 INIT_LIST_HEAD(&ib_conn->conn_list);
504 spin_lock_init(&ib_conn->lock);
508 * starts the process of connecting to the target
509 * sleeps untill the connection is established or rejected
511 int iser_connect(struct iser_conn *ib_conn,
512 struct sockaddr_in *src_addr,
513 struct sockaddr_in *dst_addr,
516 struct sockaddr *src, *dst;
519 sprintf(ib_conn->name,"%d.%d.%d.%d:%d",
520 NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port);
522 /* the device is known only --after-- address resolution */
523 ib_conn->device = NULL;
525 iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n",
526 NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port);
528 ib_conn->state = ISER_CONN_PENDING;
530 ib_conn->cma_id = rdma_create_id(iser_cma_handler,
533 if (IS_ERR(ib_conn->cma_id)) {
534 err = PTR_ERR(ib_conn->cma_id);
535 iser_err("rdma_create_id failed: %d\n", err);
539 src = (struct sockaddr *)src_addr;
540 dst = (struct sockaddr *)dst_addr;
541 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000);
543 iser_err("rdma_resolve_addr failed: %d\n", err);
548 wait_event_interruptible(ib_conn->wait,
549 (ib_conn->state != ISER_CONN_PENDING));
551 if (ib_conn->state != ISER_CONN_UP) {
553 goto connect_failure;
557 mutex_lock(&ig.connlist_mutex);
558 list_add(&ib_conn->conn_list, &ig.connlist);
559 mutex_unlock(&ig.connlist_mutex);
563 ib_conn->cma_id = NULL;
565 ib_conn->state = ISER_CONN_DOWN;
567 iser_conn_release(ib_conn);
572 * iser_reg_page_vec - Register physical memory
574 * returns: 0 on success, errno code on failure
576 int iser_reg_page_vec(struct iser_conn *ib_conn,
577 struct iser_page_vec *page_vec,
578 struct iser_mem_reg *mem_reg)
580 struct ib_pool_fmr *mem;
585 page_list = page_vec->pages;
586 io_addr = page_list[0];
588 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
594 status = (int)PTR_ERR(mem);
595 iser_err("ib_fmr_pool_map_phys failed: %d\n", status);
599 mem_reg->lkey = mem->fmr->lkey;
600 mem_reg->rkey = mem->fmr->rkey;
601 mem_reg->len = page_vec->length * SIZE_4K;
602 mem_reg->va = io_addr;
604 mem_reg->mem_h = (void *)mem;
606 mem_reg->va += page_vec->offset;
607 mem_reg->len = page_vec->data_size;
609 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, "
610 "entry[0]: (0x%08lx,%ld)] -> "
611 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n",
612 page_vec, page_vec->length,
613 (unsigned long)page_vec->pages[0],
614 (unsigned long)page_vec->data_size,
615 (unsigned int)mem_reg->lkey, mem_reg->mem_h,
616 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len);
621 * Unregister (previosuly registered) memory.
623 void iser_unreg_mem(struct iser_mem_reg *reg)
627 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h);
629 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
631 iser_err("ib_fmr_pool_unmap failed %d\n", ret);
637 * iser_dto_to_iov - builds IOV from a dto descriptor
639 static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len)
643 struct iser_regd_buf *regd_buf;
645 if (dto->regd_vector_len > iov_len) {
646 iser_err("iov size %d too small for posting dto of len %d\n",
647 iov_len, dto->regd_vector_len);
651 for (i = 0; i < dto->regd_vector_len; i++) {
653 regd_buf = dto->regd[i];
655 sge->addr = regd_buf->reg.va;
656 sge->length = regd_buf->reg.len;
657 sge->lkey = regd_buf->reg.lkey;
659 if (dto->used_sz[i] > 0) /* Adjust size */
660 sge->length = dto->used_sz[i];
662 /* offset and length should not exceed the regd buf length */
663 if (sge->length + dto->offset[i] > regd_buf->reg.len) {
664 iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:"
665 "%ld in dto:0x%p [%d], va:0x%08lX\n",
666 (unsigned long)sge->length, dto->offset[i],
667 (unsigned long)regd_buf->reg.len, dto, i,
668 (unsigned long)sge->addr);
672 sge->addr += dto->offset[i]; /* Adjust offset */
677 * iser_post_recv - Posts a receive buffer.
679 * returns 0 on success, -1 on failure
681 int iser_post_recv(struct iser_desc *rx_desc)
683 int ib_ret, ret_val = 0;
684 struct ib_recv_wr recv_wr, *recv_wr_failed;
685 struct ib_sge iov[2];
686 struct iser_conn *ib_conn;
687 struct iser_dto *recv_dto = &rx_desc->dto;
690 ib_conn = recv_dto->ib_conn;
692 iser_dto_to_iov(recv_dto, iov, 2);
695 recv_wr.sg_list = iov;
696 recv_wr.num_sge = recv_dto->regd_vector_len;
697 recv_wr.wr_id = (unsigned long)rx_desc;
699 atomic_inc(&ib_conn->post_recv_buf_count);
700 ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed);
702 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
703 atomic_dec(&ib_conn->post_recv_buf_count);
711 * iser_start_send - Initiate a Send DTO operation
713 * returns 0 on success, -1 on failure
715 int iser_post_send(struct iser_desc *tx_desc)
717 int ib_ret, ret_val = 0;
718 struct ib_send_wr send_wr, *send_wr_failed;
719 struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN];
720 struct iser_conn *ib_conn;
721 struct iser_dto *dto = &tx_desc->dto;
723 ib_conn = dto->ib_conn;
725 iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN);
728 send_wr.wr_id = (unsigned long)tx_desc;
729 send_wr.sg_list = iov;
730 send_wr.num_sge = dto->regd_vector_len;
731 send_wr.opcode = IB_WR_SEND;
732 send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0;
734 atomic_inc(&ib_conn->post_send_buf_count);
736 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
738 iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n",
739 dto, dto->regd_vector_len);
740 iser_err("ib_post_send failed, ret:%d\n", ib_ret);
741 atomic_dec(&ib_conn->post_send_buf_count);
748 static void iser_handle_comp_error(struct iser_desc *desc)
750 struct iser_dto *dto = &desc->dto;
751 struct iser_conn *ib_conn = dto->ib_conn;
753 iser_dto_buffs_release(dto);
755 if (desc->type == ISCSI_RX) {
757 kmem_cache_free(ig.desc_cache, desc);
758 atomic_dec(&ib_conn->post_recv_buf_count);
759 } else { /* type is TX control/command/dataout */
760 if (desc->type == ISCSI_TX_DATAOUT)
761 kmem_cache_free(ig.desc_cache, desc);
762 atomic_dec(&ib_conn->post_send_buf_count);
765 if (atomic_read(&ib_conn->post_recv_buf_count) == 0 &&
766 atomic_read(&ib_conn->post_send_buf_count) == 0) {
767 /* getting here when the state is UP means that the conn is *
768 * being terminated asynchronously from the iSCSI layer's *
770 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
771 ISER_CONN_TERMINATING))
772 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
773 ISCSI_ERR_CONN_FAILED);
775 /* complete the termination process if disconnect event was delivered *
776 * note there are no more non completed posts to the QP */
777 if (ib_conn->disc_evt_flag) {
778 ib_conn->state = ISER_CONN_DOWN;
779 wake_up_interruptible(&ib_conn->wait);
784 static void iser_cq_tasklet_fn(unsigned long data)
786 struct iser_device *device = (struct iser_device *)data;
787 struct ib_cq *cq = device->cq;
789 struct iser_desc *desc;
790 unsigned long xfer_len;
792 while (ib_poll_cq(cq, 1, &wc) == 1) {
793 desc = (struct iser_desc *) (unsigned long) wc.wr_id;
794 BUG_ON(desc == NULL);
796 if (wc.status == IB_WC_SUCCESS) {
797 if (desc->type == ISCSI_RX) {
798 xfer_len = (unsigned long)wc.byte_len;
799 iser_rcv_completion(desc, xfer_len);
800 } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */
801 iser_snd_completion(desc);
803 iser_err("comp w. error op %d status %d\n",desc->type,wc.status);
804 iser_handle_comp_error(desc);
807 /* #warning "it is assumed here that arming CQ only once its empty" *
808 * " would not cause interrupts to be missed" */
809 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
812 static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
814 struct iser_device *device = (struct iser_device *)cq_context;
816 tasklet_schedule(&device->cq_tasklet);