/******************************************************************************* * This file contains iSCSI extentions for RDMA (iSER) Verbs * * (c) Copyright 2013 Datera, Inc. * * Nicholas A. Bellinger * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "isert_proto.h" #include "ib_isert.h" #define ISERT_MAX_CONN 8 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN) #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN) static DEFINE_MUTEX(device_list_mutex); static LIST_HEAD(device_list); static struct workqueue_struct *isert_rx_wq; static struct workqueue_struct *isert_comp_wq; static void isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn); static int isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct isert_rdma_wr *wr); static void isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn); static int isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct isert_rdma_wr *wr); static void isert_qp_event_callback(struct ib_event *e, void *context) { struct isert_conn *isert_conn = (struct isert_conn *)context; pr_err("isert_qp_event_callback event: %d\n", e->event); switch (e->event) { case IB_EVENT_COMM_EST: rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST); break; case IB_EVENT_QP_LAST_WQE_REACHED: pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n"); break; default: break; } } static int isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr) { int ret; ret = ib_query_device(ib_dev, devattr); if (ret) { pr_err("ib_query_device() failed: %d\n", ret); return ret; } pr_debug("devattr->max_sge: %d\n", devattr->max_sge); pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd); return 0; } static int isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id) { struct isert_device *device = isert_conn->conn_device; struct ib_qp_init_attr attr; int ret, index, min_index = 0; mutex_lock(&device_list_mutex); for (index = 0; index < device->cqs_used; index++) if (device->cq_active_qps[index] < device->cq_active_qps[min_index]) min_index = index; device->cq_active_qps[min_index]++; pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index); mutex_unlock(&device_list_mutex); memset(&attr, 0, sizeof(struct ib_qp_init_attr)); attr.event_handler = isert_qp_event_callback; attr.qp_context = isert_conn; attr.send_cq = device->dev_tx_cq[min_index]; attr.recv_cq = device->dev_rx_cq[min_index]; attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS; attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS; /* * FIXME: Use devattr.max_sge - 2 for max_send_sge as * work-around for RDMA_READ.. */ attr.cap.max_send_sge = device->dev_attr.max_sge - 2; isert_conn->max_sge = attr.cap.max_send_sge; attr.cap.max_recv_sge = 1; attr.sq_sig_type = IB_SIGNAL_REQ_WR; attr.qp_type = IB_QPT_RC; pr_debug("isert_conn_setup_qp cma_id->device: %p\n", cma_id->device); pr_debug("isert_conn_setup_qp conn_pd->device: %p\n", isert_conn->conn_pd->device); ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr); if (ret) { pr_err("rdma_create_qp failed for cma_id %d\n", ret); return ret; } isert_conn->conn_qp = cma_id->qp; pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n"); return 0; } static void isert_cq_event_callback(struct ib_event *e, void *context) { pr_debug("isert_cq_event_callback event: %d\n", e->event); } static int isert_alloc_rx_descriptors(struct isert_conn *isert_conn) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct iser_rx_desc *rx_desc; struct ib_sge *rx_sg; u64 dma_addr; int i, j; isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS * sizeof(struct iser_rx_desc), GFP_KERNEL); if (!isert_conn->conn_rx_descs) goto fail; rx_desc = isert_conn->conn_rx_descs; for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc, ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); if (ib_dma_mapping_error(ib_dev, dma_addr)) goto dma_map_fail; rx_desc->dma_addr = dma_addr; rx_sg = &rx_desc->rx_sg; rx_sg->addr = rx_desc->dma_addr; rx_sg->length = ISER_RX_PAYLOAD_SIZE; rx_sg->lkey = isert_conn->conn_mr->lkey; } isert_conn->conn_rx_desc_head = 0; return 0; dma_map_fail: rx_desc = isert_conn->conn_rx_descs; for (j = 0; j < i; j++, rx_desc++) { ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); } kfree(isert_conn->conn_rx_descs); isert_conn->conn_rx_descs = NULL; fail: return -ENOMEM; } static void isert_free_rx_descriptors(struct isert_conn *isert_conn) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct iser_rx_desc *rx_desc; int i; if (!isert_conn->conn_rx_descs) return; rx_desc = isert_conn->conn_rx_descs; for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); } kfree(isert_conn->conn_rx_descs); isert_conn->conn_rx_descs = NULL; } static void isert_cq_tx_work(struct work_struct *); static void isert_cq_tx_callback(struct ib_cq *, void *); static void isert_cq_rx_work(struct work_struct *); static void isert_cq_rx_callback(struct ib_cq *, void *); static int isert_create_device_ib_res(struct isert_device *device) { struct ib_device *ib_dev = device->ib_device; struct isert_cq_desc *cq_desc; struct ib_device_attr *dev_attr; int ret = 0, i, j; dev_attr = &device->dev_attr; ret = isert_query_device(ib_dev, dev_attr); if (ret) return ret; /* asign function handlers */ if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { device->use_fastreg = 1; device->reg_rdma_mem = isert_reg_rdma; device->unreg_rdma_mem = isert_unreg_rdma; } else { device->use_fastreg = 0; device->reg_rdma_mem = isert_map_rdma; device->unreg_rdma_mem = isert_unmap_cmd; } device->cqs_used = min_t(int, num_online_cpus(), device->ib_device->num_comp_vectors); device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used); pr_debug("Using %d CQs, device %s supports %d vectors support " "Fast registration %d\n", device->cqs_used, device->ib_device->name, device->ib_device->num_comp_vectors, device->use_fastreg); device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) * device->cqs_used, GFP_KERNEL); if (!device->cq_desc) { pr_err("Unable to allocate device->cq_desc\n"); return -ENOMEM; } cq_desc = device->cq_desc; for (i = 0; i < device->cqs_used; i++) { cq_desc[i].device = device; cq_desc[i].cq_index = i; INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work); device->dev_rx_cq[i] = ib_create_cq(device->ib_device, isert_cq_rx_callback, isert_cq_event_callback, (void *)&cq_desc[i], ISER_MAX_RX_CQ_LEN, i); if (IS_ERR(device->dev_rx_cq[i])) { ret = PTR_ERR(device->dev_rx_cq[i]); device->dev_rx_cq[i] = NULL; goto out_cq; } INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work); device->dev_tx_cq[i] = ib_create_cq(device->ib_device, isert_cq_tx_callback, isert_cq_event_callback, (void *)&cq_desc[i], ISER_MAX_TX_CQ_LEN, i); if (IS_ERR(device->dev_tx_cq[i])) { ret = PTR_ERR(device->dev_tx_cq[i]); device->dev_tx_cq[i] = NULL; goto out_cq; } ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP); if (ret) goto out_cq; ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP); if (ret) goto out_cq; } return 0; out_cq: for (j = 0; j < i; j++) { cq_desc = &device->cq_desc[j]; if (device->dev_rx_cq[j]) { cancel_work_sync(&cq_desc->cq_rx_work); ib_destroy_cq(device->dev_rx_cq[j]); } if (device->dev_tx_cq[j]) { cancel_work_sync(&cq_desc->cq_tx_work); ib_destroy_cq(device->dev_tx_cq[j]); } } kfree(device->cq_desc); return ret; } static void isert_free_device_ib_res(struct isert_device *device) { struct isert_cq_desc *cq_desc; int i; for (i = 0; i < device->cqs_used; i++) { cq_desc = &device->cq_desc[i]; cancel_work_sync(&cq_desc->cq_rx_work); cancel_work_sync(&cq_desc->cq_tx_work); ib_destroy_cq(device->dev_rx_cq[i]); ib_destroy_cq(device->dev_tx_cq[i]); device->dev_rx_cq[i] = NULL; device->dev_tx_cq[i] = NULL; } kfree(device->cq_desc); } static void isert_device_try_release(struct isert_device *device) { mutex_lock(&device_list_mutex); device->refcount--; if (!device->refcount) { isert_free_device_ib_res(device); list_del(&device->dev_node); kfree(device); } mutex_unlock(&device_list_mutex); } static struct isert_device * isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id) { struct isert_device *device; int ret; mutex_lock(&device_list_mutex); list_for_each_entry(device, &device_list, dev_node) { if (device->ib_device->node_guid == cma_id->device->node_guid) { device->refcount++; mutex_unlock(&device_list_mutex); return device; } } device = kzalloc(sizeof(struct isert_device), GFP_KERNEL); if (!device) { mutex_unlock(&device_list_mutex); return ERR_PTR(-ENOMEM); } INIT_LIST_HEAD(&device->dev_node); device->ib_device = cma_id->device; ret = isert_create_device_ib_res(device); if (ret) { kfree(device); mutex_unlock(&device_list_mutex); return ERR_PTR(ret); } device->refcount++; list_add_tail(&device->dev_node, &device_list); mutex_unlock(&device_list_mutex); return device; } static void isert_conn_free_fastreg_pool(struct isert_conn *isert_conn) { struct fast_reg_descriptor *fr_desc, *tmp; int i = 0; if (list_empty(&isert_conn->conn_fr_pool)) return; pr_debug("Freeing conn %p fastreg pool", isert_conn); list_for_each_entry_safe(fr_desc, tmp, &isert_conn->conn_fr_pool, list) { list_del(&fr_desc->list); ib_free_fast_reg_page_list(fr_desc->data_frpl); ib_dereg_mr(fr_desc->data_mr); kfree(fr_desc); ++i; } if (i < isert_conn->conn_fr_pool_size) pr_warn("Pool still has %d regions registered\n", isert_conn->conn_fr_pool_size - i); } static int isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd, struct fast_reg_descriptor *fr_desc) { fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device, ISCSI_ISER_SG_TABLESIZE); if (IS_ERR(fr_desc->data_frpl)) { pr_err("Failed to allocate data frpl err=%ld\n", PTR_ERR(fr_desc->data_frpl)); return PTR_ERR(fr_desc->data_frpl); } fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE); if (IS_ERR(fr_desc->data_mr)) { pr_err("Failed to allocate data frmr err=%ld\n", PTR_ERR(fr_desc->data_mr)); ib_free_fast_reg_page_list(fr_desc->data_frpl); return PTR_ERR(fr_desc->data_mr); } pr_debug("Create fr_desc %p page_list %p\n", fr_desc, fr_desc->data_frpl->page_list); fr_desc->valid = true; return 0; } static int isert_conn_create_fastreg_pool(struct isert_conn *isert_conn) { struct fast_reg_descriptor *fr_desc; struct isert_device *device = isert_conn->conn_device; struct se_session *se_sess = isert_conn->conn->sess->se_sess; struct se_node_acl *se_nacl = se_sess->se_node_acl; int i, ret, tag_num; /* * Setup the number of FRMRs based upon the number of tags * available to session in iscsi_target_locate_portal(). */ tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth); tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; isert_conn->conn_fr_pool_size = 0; for (i = 0; i < tag_num; i++) { fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL); if (!fr_desc) { pr_err("Failed to allocate fast_reg descriptor\n"); ret = -ENOMEM; goto err; } ret = isert_create_fr_desc(device->ib_device, isert_conn->conn_pd, fr_desc); if (ret) { pr_err("Failed to create fastreg descriptor err=%d\n", ret); kfree(fr_desc); goto err; } list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool); isert_conn->conn_fr_pool_size++; } pr_debug("Creating conn %p fastreg pool size=%d", isert_conn, isert_conn->conn_fr_pool_size); return 0; err: isert_conn_free_fastreg_pool(isert_conn); return ret; } static int isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) { struct iscsi_np *np = cma_id->context; struct isert_np *isert_np = np->np_context; struct isert_conn *isert_conn; struct isert_device *device; struct ib_device *ib_dev = cma_id->device; int ret = 0; pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n", cma_id, cma_id->context); isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL); if (!isert_conn) { pr_err("Unable to allocate isert_conn\n"); return -ENOMEM; } isert_conn->state = ISER_CONN_INIT; INIT_LIST_HEAD(&isert_conn->conn_accept_node); init_completion(&isert_conn->conn_login_comp); init_completion(&isert_conn->conn_wait); init_completion(&isert_conn->conn_wait_comp_err); kref_init(&isert_conn->conn_kref); kref_get(&isert_conn->conn_kref); mutex_init(&isert_conn->conn_mutex); spin_lock_init(&isert_conn->conn_lock); INIT_LIST_HEAD(&isert_conn->conn_fr_pool); cma_id->context = isert_conn; isert_conn->conn_cm_id = cma_id; isert_conn->responder_resources = event->param.conn.responder_resources; isert_conn->initiator_depth = event->param.conn.initiator_depth; pr_debug("Using responder_resources: %u initiator_depth: %u\n", isert_conn->responder_resources, isert_conn->initiator_depth); isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + ISER_RX_LOGIN_SIZE, GFP_KERNEL); if (!isert_conn->login_buf) { pr_err("Unable to allocate isert_conn->login_buf\n"); ret = -ENOMEM; goto out; } isert_conn->login_req_buf = isert_conn->login_buf; isert_conn->login_rsp_buf = isert_conn->login_buf + ISCSI_DEF_MAX_RECV_SEG_LEN; pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n", isert_conn->login_buf, isert_conn->login_req_buf, isert_conn->login_rsp_buf); isert_conn->login_req_dma = ib_dma_map_single(ib_dev, (void *)isert_conn->login_req_buf, ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma); if (ret) { pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n", ret); isert_conn->login_req_dma = 0; goto out_login_buf; } isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, (void *)isert_conn->login_rsp_buf, ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); if (ret) { pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n", ret); isert_conn->login_rsp_dma = 0; goto out_req_dma_map; } device = isert_device_find_by_ib_dev(cma_id); if (IS_ERR(device)) { ret = PTR_ERR(device); goto out_rsp_dma_map; } isert_conn->conn_device = device; isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device); if (IS_ERR(isert_conn->conn_pd)) { ret = PTR_ERR(isert_conn->conn_pd); pr_err("ib_alloc_pd failed for conn %p: ret=%d\n", isert_conn, ret); goto out_pd; } isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd, IB_ACCESS_LOCAL_WRITE); if (IS_ERR(isert_conn->conn_mr)) { ret = PTR_ERR(isert_conn->conn_mr); pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n", isert_conn, ret); goto out_mr; } ret = isert_conn_setup_qp(isert_conn, cma_id); if (ret) goto out_conn_dev; mutex_lock(&isert_np->np_accept_mutex); list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list); mutex_unlock(&isert_np->np_accept_mutex); pr_debug("isert_connect_request() up np_sem np: %p\n", np); up(&isert_np->np_sem); return 0; out_conn_dev: ib_dereg_mr(isert_conn->conn_mr); out_mr: ib_dealloc_pd(isert_conn->conn_pd); out_pd: isert_device_try_release(device); out_rsp_dma_map: ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); out_req_dma_map: ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); out_login_buf: kfree(isert_conn->login_buf); out: kfree(isert_conn); return ret; } static void isert_connect_release(struct isert_conn *isert_conn) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct isert_device *device = isert_conn->conn_device; int cq_index; pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); if (device && device->use_fastreg) isert_conn_free_fastreg_pool(isert_conn); if (isert_conn->conn_qp) { cq_index = ((struct isert_cq_desc *) isert_conn->conn_qp->recv_cq->cq_context)->cq_index; pr_debug("isert_connect_release: cq_index: %d\n", cq_index); isert_conn->conn_device->cq_active_qps[cq_index]--; rdma_destroy_qp(isert_conn->conn_cm_id); } isert_free_rx_descriptors(isert_conn); rdma_destroy_id(isert_conn->conn_cm_id); ib_dereg_mr(isert_conn->conn_mr); ib_dealloc_pd(isert_conn->conn_pd); if (isert_conn->login_buf) { ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); kfree(isert_conn->login_buf); } kfree(isert_conn); if (device) isert_device_try_release(device); pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n"); } static void isert_connected_handler(struct rdma_cm_id *cma_id) { return; } static void isert_release_conn_kref(struct kref *kref) { struct isert_conn *isert_conn = container_of(kref, struct isert_conn, conn_kref); pr_debug("Calling isert_connect_release for final kref %s/%d\n", current->comm, current->pid); isert_connect_release(isert_conn); } static void isert_put_conn(struct isert_conn *isert_conn) { kref_put(&isert_conn->conn_kref, isert_release_conn_kref); } static void isert_disconnect_work(struct work_struct *work) { struct isert_conn *isert_conn = container_of(work, struct isert_conn, conn_logout_work); pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); mutex_lock(&isert_conn->conn_mutex); if (isert_conn->state == ISER_CONN_UP) isert_conn->state = ISER_CONN_TERMINATING; if (isert_conn->post_recv_buf_count == 0 && atomic_read(&isert_conn->post_send_buf_count) == 0) { mutex_unlock(&isert_conn->conn_mutex); goto wake_up; } if (!isert_conn->conn_cm_id) { mutex_unlock(&isert_conn->conn_mutex); isert_put_conn(isert_conn); return; } if (!isert_conn->logout_posted) { pr_debug("Calling rdma_disconnect for !logout_posted from" " isert_disconnect_work\n"); rdma_disconnect(isert_conn->conn_cm_id); mutex_unlock(&isert_conn->conn_mutex); iscsit_cause_connection_reinstatement(isert_conn->conn, 0); goto wake_up; } mutex_unlock(&isert_conn->conn_mutex); wake_up: complete(&isert_conn->conn_wait); isert_put_conn(isert_conn); } static void isert_disconnected_handler(struct rdma_cm_id *cma_id) { struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context; INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work); schedule_work(&isert_conn->conn_logout_work); } static int isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) { int ret = 0; pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n", event->event, event->status, cma_id->context, cma_id); switch (event->event) { case RDMA_CM_EVENT_CONNECT_REQUEST: pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n"); ret = isert_connect_request(cma_id, event); break; case RDMA_CM_EVENT_ESTABLISHED: pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n"); isert_connected_handler(cma_id); break; case RDMA_CM_EVENT_DISCONNECTED: pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n"); isert_disconnected_handler(cma_id); break; case RDMA_CM_EVENT_DEVICE_REMOVAL: case RDMA_CM_EVENT_ADDR_CHANGE: break; case RDMA_CM_EVENT_CONNECT_ERROR: default: pr_err("Unknown RDMA CMA event: %d\n", event->event); break; } if (ret != 0) { pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n", event->event, ret); dump_stack(); } return ret; } static int isert_post_recv(struct isert_conn *isert_conn, u32 count) { struct ib_recv_wr *rx_wr, *rx_wr_failed; int i, ret; unsigned int rx_head = isert_conn->conn_rx_desc_head; struct iser_rx_desc *rx_desc; for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) { rx_desc = &isert_conn->conn_rx_descs[rx_head]; rx_wr->wr_id = (unsigned long)rx_desc; rx_wr->sg_list = &rx_desc->rx_sg; rx_wr->num_sge = 1; rx_wr->next = rx_wr + 1; rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1); } rx_wr--; rx_wr->next = NULL; /* mark end of work requests list */ isert_conn->post_recv_buf_count += count; ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr, &rx_wr_failed); if (ret) { pr_err("ib_post_recv() failed with ret: %d\n", ret); isert_conn->post_recv_buf_count -= count; } else { pr_debug("isert_post_recv(): Posted %d RX buffers\n", count); isert_conn->conn_rx_desc_head = rx_head; } return ret; } static int isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct ib_send_wr send_wr, *send_wr_failed; int ret; ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); send_wr.next = NULL; send_wr.wr_id = (unsigned long)tx_desc; send_wr.sg_list = tx_desc->tx_sg; send_wr.num_sge = tx_desc->num_sge; send_wr.opcode = IB_WR_SEND; send_wr.send_flags = IB_SEND_SIGNALED; atomic_inc(&isert_conn->post_send_buf_count); ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed); if (ret) { pr_err("ib_post_send() failed, ret: %d\n", ret); atomic_dec(&isert_conn->post_send_buf_count); } return ret; } static void isert_create_send_desc(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, struct iser_tx_desc *tx_desc) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); tx_desc->iser_header.flags = ISER_VER; tx_desc->num_sge = 1; tx_desc->isert_cmd = isert_cmd; if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) { tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey; pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc); } } static int isert_init_tx_hdrs(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; u64 dma_addr; dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc, ISER_HEADERS_LEN, DMA_TO_DEVICE); if (ib_dma_mapping_error(ib_dev, dma_addr)) { pr_err("ib_dma_mapping_error() failed\n"); return -ENOMEM; } tx_desc->dma_addr = dma_addr; tx_desc->tx_sg[0].addr = tx_desc->dma_addr; tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey; pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u" " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey); return 0; } static void isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, struct ib_send_wr *send_wr, bool coalesce) { struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc; isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND; send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc; send_wr->opcode = IB_WR_SEND; send_wr->sg_list = &tx_desc->tx_sg[0]; send_wr->num_sge = isert_cmd->tx_desc.num_sge; /* * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls. */ mutex_lock(&isert_conn->conn_mutex); if (coalesce && isert_conn->state == ISER_CONN_UP && ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) { tx_desc->llnode_active = true; llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist); mutex_unlock(&isert_conn->conn_mutex); return; } isert_conn->conn_comp_batch = 0; tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist); mutex_unlock(&isert_conn->conn_mutex); send_wr->send_flags = IB_SEND_SIGNALED; } static int isert_rdma_post_recvl(struct isert_conn *isert_conn) { struct ib_recv_wr rx_wr, *rx_wr_fail; struct ib_sge sge; int ret; memset(&sge, 0, sizeof(struct ib_sge)); sge.addr = isert_conn->login_req_dma; sge.length = ISER_RX_LOGIN_SIZE; sge.lkey = isert_conn->conn_mr->lkey; pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n", sge.addr, sge.length, sge.lkey); memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf; rx_wr.sg_list = &sge; rx_wr.num_sge = 1; isert_conn->post_recv_buf_count++; ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail); if (ret) { pr_err("ib_post_recv() failed: %d\n", ret); isert_conn->post_recv_buf_count--; } pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n"); return ret; } static int isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, u32 length) { struct isert_conn *isert_conn = conn->context; struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc; int ret; isert_create_send_desc(isert_conn, NULL, tx_desc); memcpy(&tx_desc->iscsi_header, &login->rsp[0], sizeof(struct iscsi_hdr)); isert_init_tx_hdrs(isert_conn, tx_desc); if (length > 0) { struct ib_sge *tx_dsg = &tx_desc->tx_sg[1]; ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma, length, DMA_TO_DEVICE); memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length); ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma, length, DMA_TO_DEVICE); tx_dsg->addr = isert_conn->login_rsp_dma; tx_dsg->length = length; tx_dsg->lkey = isert_conn->conn_mr->lkey; tx_desc->num_sge = 2; } if (!login->login_failed) { if (login->login_complete) { if (isert_conn->conn_device->use_fastreg) { ret = isert_conn_create_fastreg_pool(isert_conn); if (ret) { pr_err("Conn: %p failed to create" " fastreg pool\n", isert_conn); return ret; } } ret = isert_alloc_rx_descriptors(isert_conn); if (ret) return ret; ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX); if (ret) return ret; isert_conn->state = ISER_CONN_UP; goto post_send; } ret = isert_rdma_post_recvl(isert_conn); if (ret) return ret; } post_send: ret = isert_post_send(isert_conn, tx_desc); if (ret) return ret; return 0; } static void isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen, struct isert_conn *isert_conn) { struct iscsi_conn *conn = isert_conn->conn; struct iscsi_login *login = conn->conn_login; int size; if (!login) { pr_err("conn->conn_login is NULL\n"); dump_stack(); return; } if (login->first_request) { struct iscsi_login_req *login_req = (struct iscsi_login_req *)&rx_desc->iscsi_header; /* * Setup the initial iscsi_login values from the leading * login request PDU. */ login->leading_connection = (!login_req->tsih) ? 1 : 0; login->current_stage = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2; login->version_min = login_req->min_version; login->version_max = login_req->max_version; memcpy(login->isid, login_req->isid, 6); login->cmd_sn = be32_to_cpu(login_req->cmdsn); login->init_task_tag = login_req->itt; login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); login->cid = be16_to_cpu(login_req->cid); login->tsih = be16_to_cpu(login_req->tsih); } memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN); size = min(rx_buflen, MAX_KEY_VALUE_PAIRS); pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen, MAX_KEY_VALUE_PAIRS); memcpy(login->req_buf, &rx_desc->data[0], size); if (login->first_request) { complete(&isert_conn->conn_login_comp); return; } schedule_delayed_work(&conn->login_work, 0); } static struct iscsi_cmd *isert_allocate_cmd(struct iscsi_conn *conn) { struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct isert_cmd *isert_cmd; struct iscsi_cmd *cmd; cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); if (!cmd) { pr_err("Unable to allocate iscsi_cmd + isert_cmd\n"); return NULL; } isert_cmd = iscsit_priv_cmd(cmd); isert_cmd->conn = isert_conn; isert_cmd->iscsi_cmd = cmd; return cmd; } static int isert_handle_scsi_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, unsigned char *buf) { struct iscsi_conn *conn = isert_conn->conn; struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; struct scatterlist *sg; int imm_data, imm_data_len, unsol_data, sg_nents, rc; bool dump_payload = false; rc = iscsit_setup_scsi_cmd(conn, cmd, buf); if (rc < 0) return rc; imm_data = cmd->immediate_data; imm_data_len = cmd->first_burst_len; unsol_data = cmd->unsolicited_data; rc = iscsit_process_scsi_cmd(conn, cmd, hdr); if (rc < 0) { return 0; } else if (rc > 0) { dump_payload = true; goto sequence_cmd; } if (!imm_data) return 0; sg = &cmd->se_cmd.t_data_sg[0]; sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE)); pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n", sg, sg_nents, &rx_desc->data[0], imm_data_len); sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len); cmd->write_data_done += imm_data_len; if (cmd->write_data_done == cmd->se_cmd.data_length) { spin_lock_bh(&cmd->istate_lock); cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; spin_unlock_bh(&cmd->istate_lock); } sequence_cmd: rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); if (!rc && dump_payload == false && unsol_data) iscsit_set_unsoliticed_dataout(cmd); return 0; } static int isert_handle_iscsi_dataout(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc, unsigned char *buf) { struct scatterlist *sg_start; struct iscsi_conn *conn = isert_conn->conn; struct iscsi_cmd *cmd = NULL; struct iscsi_data *hdr = (struct iscsi_data *)buf; u32 unsol_data_len = ntoh24(hdr->dlength); int rc, sg_nents, sg_off, page_off; rc = iscsit_check_dataout_hdr(conn, buf, &cmd); if (rc < 0) return rc; else if (!cmd) return 0; /* * FIXME: Unexpected unsolicited_data out */ if (!cmd->unsolicited_data) { pr_err("Received unexpected solicited data payload\n"); dump_stack(); return -1; } pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n", unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length); sg_off = cmd->write_data_done / PAGE_SIZE; sg_start = &cmd->se_cmd.t_data_sg[sg_off]; sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE)); page_off = cmd->write_data_done % PAGE_SIZE; /* * FIXME: Non page-aligned unsolicited_data out */ if (page_off) { pr_err("Received unexpected non-page aligned data payload\n"); dump_stack(); return -1; } pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n", sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len); sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0], unsol_data_len); rc = iscsit_check_dataout_payload(cmd, hdr, false); if (rc < 0) return rc; return 0; } static int isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, unsigned char *buf) { struct iscsi_conn *conn = isert_conn->conn; struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; int rc; rc = iscsit_setup_nop_out(conn, cmd, hdr); if (rc < 0) return rc; /* * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload */ return iscsit_process_nop_out(conn, cmd, hdr); } static int isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, struct iscsi_text *hdr) { struct iscsi_conn *conn = isert_conn->conn; u32 payload_length = ntoh24(hdr->dlength); int rc; unsigned char *text_in; rc = iscsit_setup_text_cmd(conn, cmd, hdr); if (rc < 0) return rc; text_in = kzalloc(payload_length, GFP_KERNEL); if (!text_in) { pr_err("Unable to allocate text_in of payload_length: %u\n", payload_length); return -ENOMEM; } cmd->text_in_ptr = text_in; memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length); return iscsit_process_text_cmd(conn, cmd, hdr); } static int isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc, uint32_t read_stag, uint64_t read_va, uint32_t write_stag, uint64_t write_va) { struct iscsi_hdr *hdr = &rx_desc->iscsi_header; struct iscsi_conn *conn = isert_conn->conn; struct iscsi_session *sess = conn->sess; struct iscsi_cmd *cmd; struct isert_cmd *isert_cmd; int ret = -EINVAL; u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); if (sess->sess_ops->SessionType && (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) { pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery," " ignoring\n", opcode); return 0; } switch (opcode) { case ISCSI_OP_SCSI_CMD: cmd = isert_allocate_cmd(conn); if (!cmd) break; isert_cmd = iscsit_priv_cmd(cmd); isert_cmd->read_stag = read_stag; isert_cmd->read_va = read_va; isert_cmd->write_stag = write_stag; isert_cmd->write_va = write_va; ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd, rx_desc, (unsigned char *)hdr); break; case ISCSI_OP_NOOP_OUT: cmd = isert_allocate_cmd(conn); if (!cmd) break; isert_cmd = iscsit_priv_cmd(cmd); ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd, rx_desc, (unsigned char *)hdr); break; case ISCSI_OP_SCSI_DATA_OUT: ret = isert_handle_iscsi_dataout(isert_conn, rx_desc, (unsigned char *)hdr); break; case ISCSI_OP_SCSI_TMFUNC: cmd = isert_allocate_cmd(conn); if (!cmd) break; ret = iscsit_handle_task_mgt_cmd(conn, cmd, (unsigned char *)hdr); break; case ISCSI_OP_LOGOUT: cmd = isert_allocate_cmd(conn); if (!cmd) break; ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); if (ret > 0) wait_for_completion_timeout(&conn->conn_logout_comp, SECONDS_FOR_LOGOUT_COMP * HZ); break; case ISCSI_OP_TEXT: cmd = isert_allocate_cmd(conn); if (!cmd) break; isert_cmd = iscsit_priv_cmd(cmd); ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd, rx_desc, (struct iscsi_text *)hdr); break; default: pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); dump_stack(); break; } return ret; } static void isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn) { struct iser_hdr *iser_hdr = &rx_desc->iser_header; uint64_t read_va = 0, write_va = 0; uint32_t read_stag = 0, write_stag = 0; int rc; switch (iser_hdr->flags & 0xF0) { case ISCSI_CTRL: if (iser_hdr->flags & ISER_RSV) { read_stag = be32_to_cpu(iser_hdr->read_stag); read_va = be64_to_cpu(iser_hdr->read_va); pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n", read_stag, (unsigned long long)read_va); } if (iser_hdr->flags & ISER_WSV) { write_stag = be32_to_cpu(iser_hdr->write_stag); write_va = be64_to_cpu(iser_hdr->write_va); pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n", write_stag, (unsigned long long)write_va); } pr_debug("ISER ISCSI_CTRL PDU\n"); break; case ISER_HELLO: pr_err("iSER Hello message\n"); break; default: pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags); break; } rc = isert_rx_opcode(isert_conn, rx_desc, read_stag, read_va, write_stag, write_va); } static void isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn, unsigned long xfer_len) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct iscsi_hdr *hdr; u64 rx_dma; int rx_buflen, outstanding; if ((char *)desc == isert_conn->login_req_buf) { rx_dma = isert_conn->login_req_dma; rx_buflen = ISER_RX_LOGIN_SIZE; pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", rx_dma, rx_buflen); } else { rx_dma = desc->dma_addr; rx_buflen = ISER_RX_PAYLOAD_SIZE; pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", rx_dma, rx_buflen); } ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE); hdr = &desc->iscsi_header; pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", hdr->opcode, hdr->itt, hdr->flags, (int)(xfer_len - ISER_HEADERS_LEN)); if ((char *)desc == isert_conn->login_req_buf) isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN, isert_conn); else isert_rx_do_work(desc, isert_conn); ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE); isert_conn->post_recv_buf_count--; pr_debug("iSERT: Decremented post_recv_buf_count: %d\n", isert_conn->post_recv_buf_count); if ((char *)desc == isert_conn->login_req_buf) return; outstanding = isert_conn->post_recv_buf_count; if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) { int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding, ISERT_MIN_POSTED_RX); err = isert_post_recv(isert_conn, count); if (err) { pr_err("isert_post_recv() count: %d failed, %d\n", count, err); } } } static void isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) { struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; struct ib_device *ib_dev = isert_conn->conn_cm_id->device; pr_debug("isert_unmap_cmd: %p\n", isert_cmd); if (wr->sge) { pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd); ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); wr->sge = NULL; } if (wr->send_wr) { pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd); kfree(wr->send_wr); wr->send_wr = NULL; } if (wr->ib_sge) { pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd); kfree(wr->ib_sge); wr->ib_sge = NULL; } } static void isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) { struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; struct ib_device *ib_dev = isert_conn->conn_cm_id->device; LIST_HEAD(unmap_list); pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd); if (wr->fr_desc) { pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n", isert_cmd, wr->fr_desc); spin_lock_bh(&isert_conn->conn_lock); list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool); spin_unlock_bh(&isert_conn->conn_lock); wr->fr_desc = NULL; } if (wr->sge) { pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd); ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); wr->sge = NULL; } wr->ib_sge = NULL; wr->send_wr = NULL; } static void isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err) { struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; struct isert_conn *isert_conn = isert_cmd->conn; struct iscsi_conn *conn = isert_conn->conn; struct isert_device *device = isert_conn->conn_device; pr_debug("Entering isert_put_cmd: %p\n", isert_cmd); switch (cmd->iscsi_opcode) { case ISCSI_OP_SCSI_CMD: spin_lock_bh(&conn->cmd_lock); if (!list_empty(&cmd->i_conn_node)) list_del_init(&cmd->i_conn_node); spin_unlock_bh(&conn->cmd_lock); if (cmd->data_direction == DMA_TO_DEVICE) { iscsit_stop_dataout_timer(cmd); /* * Check for special case during comp_err where * WRITE_PENDING has been handed off from core, * but requires an extra target_put_sess_cmd() * before transport_generic_free_cmd() below. */ if (comp_err && cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { struct se_cmd *se_cmd = &cmd->se_cmd; target_put_sess_cmd(se_cmd->se_sess, se_cmd); } } device->unreg_rdma_mem(isert_cmd, isert_conn); transport_generic_free_cmd(&cmd->se_cmd, 0); break; case ISCSI_OP_SCSI_TMFUNC: spin_lock_bh(&conn->cmd_lock); if (!list_empty(&cmd->i_conn_node)) list_del_init(&cmd->i_conn_node); spin_unlock_bh(&conn->cmd_lock); transport_generic_free_cmd(&cmd->se_cmd, 0); break; case ISCSI_OP_REJECT: case ISCSI_OP_NOOP_OUT: case ISCSI_OP_TEXT: spin_lock_bh(&conn->cmd_lock); if (!list_empty(&cmd->i_conn_node)) list_del_init(&cmd->i_conn_node); spin_unlock_bh(&conn->cmd_lock); /* * Handle special case for REJECT when iscsi_add_reject*() has * overwritten the original iscsi_opcode assignment, and the * associated cmd->se_cmd needs to be released. */ if (cmd->se_cmd.se_tfo != NULL) { pr_debug("Calling transport_generic_free_cmd from" " isert_put_cmd for 0x%02x\n", cmd->iscsi_opcode); transport_generic_free_cmd(&cmd->se_cmd, 0); break; } /* * Fall-through */ default: iscsit_release_cmd(cmd); break; } } static void isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev) { if (tx_desc->dma_addr != 0) { pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n"); ib_dma_unmap_single(ib_dev, tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); tx_desc->dma_addr = 0; } } static void isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd, struct ib_device *ib_dev, bool comp_err) { if (isert_cmd->pdu_buf_dma != 0) { pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n"); ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma, isert_cmd->pdu_buf_len, DMA_TO_DEVICE); isert_cmd->pdu_buf_dma = 0; } isert_unmap_tx_desc(tx_desc, ib_dev); isert_put_cmd(isert_cmd, comp_err); } static void isert_completion_rdma_read(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd) { struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; struct se_cmd *se_cmd = &cmd->se_cmd; struct isert_conn *isert_conn = isert_cmd->conn; struct isert_device *device = isert_conn->conn_device; iscsit_stop_dataout_timer(cmd); device->unreg_rdma_mem(isert_cmd, isert_conn); cmd->write_data_done = wr->cur_rdma_length; wr->send_wr_num = 0; pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd); spin_lock_bh(&cmd->istate_lock); cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; spin_unlock_bh(&cmd->istate_lock); target_execute_cmd(se_cmd); } static void isert_do_control_comp(struct work_struct *work) { struct isert_cmd *isert_cmd = container_of(work, struct isert_cmd, comp_work); struct isert_conn *isert_conn = isert_cmd->conn; struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; switch (cmd->i_state) { case ISTATE_SEND_TASKMGTRSP: pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n"); atomic_dec(&isert_conn->post_send_buf_count); iscsit_tmr_post_handler(cmd, cmd->conn); cmd->i_state = ISTATE_SENT_STATUS; isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false); break; case ISTATE_SEND_REJECT: pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n"); atomic_dec(&isert_conn->post_send_buf_count); cmd->i_state = ISTATE_SENT_STATUS; isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false); break; case ISTATE_SEND_LOGOUTRSP: pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n"); /* * Call atomic_dec(&isert_conn->post_send_buf_count) * from isert_wait_conn() */ isert_conn->logout_posted = true; iscsit_logout_post_handler(cmd, cmd->conn); break; case ISTATE_SEND_TEXTRSP: atomic_dec(&isert_conn->post_send_buf_count); cmd->i_state = ISTATE_SENT_STATUS; isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false); break; default: pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state); dump_stack(); break; } } static void isert_response_completion(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd, struct isert_conn *isert_conn, struct ib_device *ib_dev) { struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; if (cmd->i_state == ISTATE_SEND_TASKMGTRSP || cmd->i_state == ISTATE_SEND_LOGOUTRSP || cmd->i_state == ISTATE_SEND_REJECT || cmd->i_state == ISTATE_SEND_TEXTRSP) { isert_unmap_tx_desc(tx_desc, ib_dev); INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp); queue_work(isert_comp_wq, &isert_cmd->comp_work); return; } atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count); cmd->i_state = ISTATE_SENT_STATUS; isert_completion_put(tx_desc, isert_cmd, ib_dev, false); } static void __isert_send_completion(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct isert_cmd *isert_cmd = tx_desc->isert_cmd; struct isert_rdma_wr *wr; if (!isert_cmd) { atomic_dec(&isert_conn->post_send_buf_count); isert_unmap_tx_desc(tx_desc, ib_dev); return; } wr = &isert_cmd->rdma_wr; switch (wr->iser_ib_op) { case ISER_IB_RECV: pr_err("isert_send_completion: Got ISER_IB_RECV\n"); dump_stack(); break; case ISER_IB_SEND: pr_debug("isert_send_completion: Got ISER_IB_SEND\n"); isert_response_completion(tx_desc, isert_cmd, isert_conn, ib_dev); break; case ISER_IB_RDMA_WRITE: pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n"); dump_stack(); break; case ISER_IB_RDMA_READ: pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n"); atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count); isert_completion_rdma_read(tx_desc, isert_cmd); break; default: pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op); dump_stack(); break; } } static void isert_send_completion(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn) { struct llist_node *llnode = tx_desc->comp_llnode_batch; struct iser_tx_desc *t; /* * Drain coalesced completion llist starting from comp_llnode_batch * setup in isert_init_send_wr(), and then complete trailing tx_desc. */ while (llnode) { t = llist_entry(llnode, struct iser_tx_desc, comp_llnode); llnode = llist_next(llnode); __isert_send_completion(t, isert_conn); } __isert_send_completion(tx_desc, isert_conn); } static void isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev) { struct llist_node *llnode; struct isert_rdma_wr *wr; struct iser_tx_desc *t; mutex_lock(&isert_conn->conn_mutex); llnode = llist_del_all(&isert_conn->conn_comp_llist); isert_conn->conn_comp_batch = 0; mutex_unlock(&isert_conn->conn_mutex); while (llnode) { t = llist_entry(llnode, struct iser_tx_desc, comp_llnode); llnode = llist_next(llnode); wr = &t->isert_cmd->rdma_wr; atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count); isert_completion_put(t, t->isert_cmd, ib_dev, true); } } static void isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct isert_cmd *isert_cmd = tx_desc->isert_cmd; struct llist_node *llnode = tx_desc->comp_llnode_batch; struct isert_rdma_wr *wr; struct iser_tx_desc *t; while (llnode) { t = llist_entry(llnode, struct iser_tx_desc, comp_llnode); llnode = llist_next(llnode); wr = &t->isert_cmd->rdma_wr; atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count); isert_completion_put(t, t->isert_cmd, ib_dev, true); } tx_desc->comp_llnode_batch = NULL; if (!isert_cmd) isert_unmap_tx_desc(tx_desc, ib_dev); else isert_completion_put(tx_desc, isert_cmd, ib_dev, true); } static void isert_cq_rx_comp_err(struct isert_conn *isert_conn) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct iscsi_conn *conn = isert_conn->conn; if (isert_conn->post_recv_buf_count) return; isert_cq_drain_comp_llist(isert_conn, ib_dev); if (conn->sess) { target_sess_cmd_list_set_waiting(conn->sess->se_sess); target_wait_for_sess_cmds(conn->sess->se_sess); } while (atomic_read(&isert_conn->post_send_buf_count)) msleep(3000); mutex_lock(&isert_conn->conn_mutex); isert_conn->state = ISER_CONN_DOWN; mutex_unlock(&isert_conn->conn_mutex); complete(&isert_conn->conn_wait_comp_err); } static void isert_cq_tx_work(struct work_struct *work) { struct isert_cq_desc *cq_desc = container_of(work, struct isert_cq_desc, cq_tx_work); struct isert_device *device = cq_desc->device; int cq_index = cq_desc->cq_index; struct ib_cq *tx_cq = device->dev_tx_cq[cq_index]; struct isert_conn *isert_conn; struct iser_tx_desc *tx_desc; struct ib_wc wc; while (ib_poll_cq(tx_cq, 1, &wc) == 1) { tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id; isert_conn = wc.qp->qp_context; if (wc.status == IB_WC_SUCCESS) { isert_send_completion(tx_desc, isert_conn); } else { pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n"); pr_debug("TX wc.status: 0x%08x\n", wc.status); pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err); if (wc.wr_id != ISER_FASTREG_LI_WRID) { if (tx_desc->llnode_active) continue; atomic_dec(&isert_conn->post_send_buf_count); isert_cq_tx_comp_err(tx_desc, isert_conn); } } } ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP); } static void isert_cq_tx_callback(struct ib_cq *cq, void *context) { struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context; queue_work(isert_comp_wq, &cq_desc->cq_tx_work); } static void isert_cq_rx_work(struct work_struct *work) { struct isert_cq_desc *cq_desc = container_of(work, struct isert_cq_desc, cq_rx_work); struct isert_device *device = cq_desc->device; int cq_index = cq_desc->cq_index; struct ib_cq *rx_cq = device->dev_rx_cq[cq_index]; struct isert_conn *isert_conn; struct iser_rx_desc *rx_desc; struct ib_wc wc; unsigned long xfer_len; while (ib_poll_cq(rx_cq, 1, &wc) == 1) { rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id; isert_conn = wc.qp->qp_context; if (wc.status == IB_WC_SUCCESS) { xfer_len = (unsigned long)wc.byte_len; isert_rx_completion(rx_desc, isert_conn, xfer_len); } else { pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n"); if (wc.status != IB_WC_WR_FLUSH_ERR) { pr_debug("RX wc.status: 0x%08x\n", wc.status); pr_debug("RX wc.vendor_err: 0x%08x\n", wc.vendor_err); } isert_conn->post_recv_buf_count--; isert_cq_rx_comp_err(isert_conn); } } ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP); } static void isert_cq_rx_callback(struct ib_cq *cq, void *context) { struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context; queue_work(isert_rx_wq, &cq_desc->cq_rx_work); } static int isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) { struct ib_send_wr *wr_failed; int ret; atomic_inc(&isert_conn->post_send_buf_count); ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr, &wr_failed); if (ret) { pr_err("ib_post_send failed with %d\n", ret); atomic_dec(&isert_conn->post_send_buf_count); return ret; } return ret; } static int isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd) { struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *) &isert_cmd->tx_desc.iscsi_header; isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); iscsit_build_rsp_pdu(cmd, conn, true, hdr); isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); /* * Attach SENSE DATA payload to iSCSI Response PDU */ if (cmd->se_cmd.sense_buffer && ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; u32 padding, pdu_len; put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); cmd->se_cmd.scsi_sense_length += sizeof(__be16); padding = -(cmd->se_cmd.scsi_sense_length) & 3; hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); pdu_len = cmd->se_cmd.scsi_sense_length + padding; isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, (void *)cmd->sense_buffer, pdu_len, DMA_TO_DEVICE); isert_cmd->pdu_buf_len = pdu_len; tx_dsg->addr = isert_cmd->pdu_buf_dma; tx_dsg->length = pdu_len; tx_dsg->lkey = isert_conn->conn_mr->lkey; isert_cmd->tx_desc.num_sge = 2; } isert_init_send_wr(isert_conn, isert_cmd, send_wr, true); pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n"); return isert_post_response(isert_conn, isert_cmd); } static int isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn, bool nopout_response) { struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *) &isert_cmd->tx_desc.iscsi_header, nopout_response); isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); isert_init_send_wr(isert_conn, isert_cmd, send_wr, false); pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n"); return isert_post_response(isert_conn, isert_cmd); } static int isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *) &isert_cmd->tx_desc.iscsi_header); isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); isert_init_send_wr(isert_conn, isert_cmd, send_wr, false); pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n"); return isert_post_response(isert_conn, isert_cmd); } static int isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *) &isert_cmd->tx_desc.iscsi_header); isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); isert_init_send_wr(isert_conn, isert_cmd, send_wr, false); pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n"); return isert_post_response(isert_conn, isert_cmd); } static int isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; struct iscsi_reject *hdr = (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header; isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); iscsit_build_reject(cmd, conn, hdr); isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); hton24(hdr->dlength, ISCSI_HDR_LEN); isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, (void *)cmd->buf_ptr, ISCSI_HDR_LEN, DMA_TO_DEVICE); isert_cmd->pdu_buf_len = ISCSI_HDR_LEN; tx_dsg->addr = isert_cmd->pdu_buf_dma; tx_dsg->length = ISCSI_HDR_LEN; tx_dsg->lkey = isert_conn->conn_mr->lkey; isert_cmd->tx_desc.num_sge = 2; isert_init_send_wr(isert_conn, isert_cmd, send_wr, false); pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n"); return isert_post_response(isert_conn, isert_cmd); } static int isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) { struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; u32 txt_rsp_len; int rc; isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); rc = iscsit_build_text_rsp(cmd, conn, hdr); if (rc < 0) return rc; txt_rsp_len = rc; isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); if (txt_rsp_len) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; void *txt_rsp_buf = cmd->buf_ptr; isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE); isert_cmd->pdu_buf_len = txt_rsp_len; tx_dsg->addr = isert_cmd->pdu_buf_dma; tx_dsg->length = txt_rsp_len; tx_dsg->lkey = isert_conn->conn_mr->lkey; isert_cmd->tx_desc.num_sge = 2; } isert_init_send_wr(isert_conn, isert_cmd, send_wr, false); pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n"); return isert_post_response(isert_conn, isert_cmd); } static int isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, struct ib_sge *ib_sge, struct ib_send_wr *send_wr, u32 data_left, u32 offset) { struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; struct scatterlist *sg_start, *tmp_sg; struct ib_device *ib_dev = isert_conn->conn_cm_id->device; u32 sg_off, page_off; int i = 0, sg_nents; sg_off = offset / PAGE_SIZE; sg_start = &cmd->se_cmd.t_data_sg[sg_off]; sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge); page_off = offset % PAGE_SIZE; send_wr->sg_list = ib_sge; send_wr->num_sge = sg_nents; send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc; /* * Perform mapping of TCM scatterlist memory ib_sge dma_addr. */ for_each_sg(sg_start, tmp_sg, sg_nents, i) { pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n", (unsigned long long)tmp_sg->dma_address, tmp_sg->length, page_off); ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off; ib_sge->length = min_t(u32, data_left, ib_sg_dma_len(ib_dev, tmp_sg) - page_off); ib_sge->lkey = isert_conn->conn_mr->lkey; pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n", ib_sge->addr, ib_sge->length, ib_sge->lkey); page_off = 0; data_left -= ib_sge->length; ib_sge++; pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge); } pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n", send_wr->sg_list, send_wr->num_sge); return sg_nents; } static int isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct isert_rdma_wr *wr) { struct se_cmd *se_cmd = &cmd->se_cmd; struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct ib_send_wr *send_wr; struct ib_sge *ib_sge; struct scatterlist *sg_start; u32 sg_off = 0, sg_nents; u32 offset = 0, data_len, data_left, rdma_write_max, va_offset = 0; int ret = 0, count, i, ib_sge_cnt; if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { data_left = se_cmd->data_length; } else { sg_off = cmd->write_data_done / PAGE_SIZE; data_left = se_cmd->data_length - cmd->write_data_done; offset = cmd->write_data_done; isert_cmd->tx_desc.isert_cmd = isert_cmd; } sg_start = &cmd->se_cmd.t_data_sg[sg_off]; sg_nents = se_cmd->t_data_nents - sg_off; count = ib_dma_map_sg(ib_dev, sg_start, sg_nents, (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); if (unlikely(!count)) { pr_err("Cmd: %p unrable to map SGs\n", isert_cmd); return -EINVAL; } wr->sge = sg_start; wr->num_sge = sg_nents; wr->cur_rdma_length = data_left; pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n", isert_cmd, count, sg_start, sg_nents, data_left); ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL); if (!ib_sge) { pr_warn("Unable to allocate ib_sge\n"); ret = -ENOMEM; goto unmap_sg; } wr->ib_sge = ib_sge; wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge); wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num, GFP_KERNEL); if (!wr->send_wr) { pr_debug("Unable to allocate wr->send_wr\n"); ret = -ENOMEM; goto unmap_sg; } wr->isert_cmd = isert_cmd; rdma_write_max = isert_conn->max_sge * PAGE_SIZE; for (i = 0; i < wr->send_wr_num; i++) { send_wr = &isert_cmd->rdma_wr.send_wr[i]; data_len = min(data_left, rdma_write_max); send_wr->send_flags = 0; if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { send_wr->opcode = IB_WR_RDMA_WRITE; send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset; send_wr->wr.rdma.rkey = isert_cmd->read_stag; if (i + 1 == wr->send_wr_num) send_wr->next = &isert_cmd->tx_desc.send_wr; else send_wr->next = &wr->send_wr[i + 1]; } else { send_wr->opcode = IB_WR_RDMA_READ; send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset; send_wr->wr.rdma.rkey = isert_cmd->write_stag; if (i + 1 == wr->send_wr_num) send_wr->send_flags = IB_SEND_SIGNALED; else send_wr->next = &wr->send_wr[i + 1]; } ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge, send_wr, data_len, offset); ib_sge += ib_sge_cnt; offset += data_len; va_offset += data_len; data_left -= data_len; } return 0; unmap_sg: ib_dma_unmap_sg(ib_dev, sg_start, sg_nents, (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); return ret; } static int isert_map_fr_pagelist(struct ib_device *ib_dev, struct scatterlist *sg_start, int sg_nents, u64 *fr_pl) { u64 start_addr, end_addr, page, chunk_start = 0; struct scatterlist *tmp_sg; int i = 0, new_chunk, last_ent, n_pages; n_pages = 0; new_chunk = 1; last_ent = sg_nents - 1; for_each_sg(sg_start, tmp_sg, sg_nents, i) { start_addr = ib_sg_dma_address(ib_dev, tmp_sg); if (new_chunk) chunk_start = start_addr; end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg); pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n", i, (unsigned long long)tmp_sg->dma_address, tmp_sg->length); if ((end_addr & ~PAGE_MASK) && i < last_ent) { new_chunk = 0; continue; } new_chunk = 1; page = chunk_start & PAGE_MASK; do { fr_pl[n_pages++] = page; pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n", n_pages - 1, page); page += PAGE_SIZE; } while (page < end_addr); } return n_pages; } static int isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc, struct isert_conn *isert_conn, struct scatterlist *sg_start, struct ib_sge *ib_sge, u32 sg_nents, u32 offset, unsigned int data_len) { struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct ib_send_wr fr_wr, inv_wr; struct ib_send_wr *bad_wr, *wr = NULL; int ret, pagelist_len; u32 page_off; u8 key; sg_nents = min_t(unsigned int, sg_nents, ISCSI_ISER_SG_TABLESIZE); page_off = offset % PAGE_SIZE; pr_debug("Use fr_desc %p sg_nents %d offset %u\n", fr_desc, sg_nents, offset); pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents, &fr_desc->data_frpl->page_list[0]); if (!fr_desc->valid) { memset(&inv_wr, 0, sizeof(inv_wr)); inv_wr.wr_id = ISER_FASTREG_LI_WRID; inv_wr.opcode = IB_WR_LOCAL_INV; inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey; wr = &inv_wr; /* Bump the key */ key = (u8)(fr_desc->data_mr->rkey & 0x000000FF); ib_update_fast_reg_key(fr_desc->data_mr, ++key); } /* Prepare FASTREG WR */ memset(&fr_wr, 0, sizeof(fr_wr)); fr_wr.wr_id = ISER_FASTREG_LI_WRID; fr_wr.opcode = IB_WR_FAST_REG_MR; fr_wr.wr.fast_reg.iova_start = fr_desc->data_frpl->page_list[0] + page_off; fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl; fr_wr.wr.fast_reg.page_list_len = pagelist_len; fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT; fr_wr.wr.fast_reg.length = data_len; fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey; fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE; if (!wr) wr = &fr_wr; else wr->next = &fr_wr; ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr); if (ret) { pr_err("fast registration failed, ret:%d\n", ret); return ret; } fr_desc->valid = false; ib_sge->lkey = fr_desc->data_mr->lkey; ib_sge->addr = fr_desc->data_frpl->page_list[0] + page_off; ib_sge->length = data_len; pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n", ib_sge->addr, ib_sge->length, ib_sge->lkey); return ret; } static int isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, struct isert_rdma_wr *wr) { struct se_cmd *se_cmd = &cmd->se_cmd; struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct ib_device *ib_dev = isert_conn->conn_cm_id->device; struct ib_send_wr *send_wr; struct ib_sge *ib_sge; struct scatterlist *sg_start; struct fast_reg_descriptor *fr_desc; u32 sg_off = 0, sg_nents; u32 offset = 0, data_len, data_left, rdma_write_max; int ret = 0, count; unsigned long flags; if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { data_left = se_cmd->data_length; } else { offset = cmd->write_data_done; sg_off = offset / PAGE_SIZE; data_left = se_cmd->data_length - cmd->write_data_done; isert_cmd->tx_desc.isert_cmd = isert_cmd; } sg_start = &cmd->se_cmd.t_data_sg[sg_off]; sg_nents = se_cmd->t_data_nents - sg_off; count = ib_dma_map_sg(ib_dev, sg_start, sg_nents, (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); if (unlikely(!count)) { pr_err("Cmd: %p unrable to map SGs\n", isert_cmd); return -EINVAL; } wr->sge = sg_start; wr->num_sge = sg_nents; pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n", isert_cmd, count, sg_start, sg_nents, data_left); memset(&wr->s_ib_sge, 0, sizeof(*ib_sge)); ib_sge = &wr->s_ib_sge; wr->ib_sge = ib_sge; wr->send_wr_num = 1; memset(&wr->s_send_wr, 0, sizeof(*send_wr)); wr->send_wr = &wr->s_send_wr; wr->isert_cmd = isert_cmd; rdma_write_max = ISCSI_ISER_SG_TABLESIZE * PAGE_SIZE; send_wr = &isert_cmd->rdma_wr.s_send_wr; send_wr->sg_list = ib_sge; send_wr->num_sge = 1; send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc; if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { send_wr->opcode = IB_WR_RDMA_WRITE; send_wr->wr.rdma.remote_addr = isert_cmd->read_va; send_wr->wr.rdma.rkey = isert_cmd->read_stag; send_wr->send_flags = 0; send_wr->next = &isert_cmd->tx_desc.send_wr; } else { send_wr->opcode = IB_WR_RDMA_READ; send_wr->wr.rdma.remote_addr = isert_cmd->write_va; send_wr->wr.rdma.rkey = isert_cmd->write_stag; send_wr->send_flags = IB_SEND_SIGNALED; } data_len = min(data_left, rdma_write_max); wr->cur_rdma_length = data_len; /* if there is a single dma entry, dma mr is sufficient */ if (count == 1) { ib_sge->addr = ib_sg_dma_address(ib_dev, &sg_start[0]); ib_sge->length = ib_sg_dma_len(ib_dev, &sg_start[0]); ib_sge->lkey = isert_conn->conn_mr->lkey; wr->fr_desc = NULL; } else { spin_lock_irqsave(&isert_conn->conn_lock, flags); fr_desc = list_first_entry(&isert_conn->conn_fr_pool, struct fast_reg_descriptor, list); list_del(&fr_desc->list); spin_unlock_irqrestore(&isert_conn->conn_lock, flags); wr->fr_desc = fr_desc; ret = isert_fast_reg_mr(fr_desc, isert_conn, sg_start, ib_sge, sg_nents, offset, data_len); if (ret) { list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool); goto unmap_sg; } } return 0; unmap_sg: ib_dma_unmap_sg(ib_dev, sg_start, sg_nents, (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); return ret; } static int isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) { struct se_cmd *se_cmd = &cmd->se_cmd; struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct isert_device *device = isert_conn->conn_device; struct ib_send_wr *wr_failed; int rc; pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n", isert_cmd, se_cmd->data_length); wr->iser_ib_op = ISER_IB_RDMA_WRITE; rc = device->reg_rdma_mem(conn, cmd, wr); if (rc) { pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); return rc; } /* * Build isert_conn->tx_desc for iSCSI response PDU and attach */ isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *) &isert_cmd->tx_desc.iscsi_header); isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); isert_init_send_wr(isert_conn, isert_cmd, &isert_cmd->tx_desc.send_wr, true); atomic_add(wr->send_wr_num + 1, &isert_conn->post_send_buf_count); rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed); if (rc) { pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n"); atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count); } pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n", isert_cmd); return 1; } static int isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) { struct se_cmd *se_cmd = &cmd->se_cmd; struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; struct isert_conn *isert_conn = (struct isert_conn *)conn->context; struct isert_device *device = isert_conn->conn_device; struct ib_send_wr *wr_failed; int rc; pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", isert_cmd, se_cmd->data_length, cmd->write_data_done); wr->iser_ib_op = ISER_IB_RDMA_READ; rc = device->reg_rdma_mem(conn, cmd, wr); if (rc) { pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); return rc; } atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count); rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed); if (rc) { pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n"); atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count); } pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n", isert_cmd); return 0; } static int isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) { int ret; switch (state) { case ISTATE_SEND_NOPIN_WANT_RESPONSE: ret = isert_put_nopin(cmd, conn, false); break; default: pr_err("Unknown immediate state: 0x%02x\n", state); ret = -EINVAL; break; } return ret; } static int isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) { int ret; switch (state) { case ISTATE_SEND_LOGOUTRSP: ret = isert_put_logout_rsp(cmd, conn); if (!ret) { pr_debug("Returning iSER Logout -EAGAIN\n"); ret = -EAGAIN; } break; case ISTATE_SEND_NOPIN: ret = isert_put_nopin(cmd, conn, true); break; case ISTATE_SEND_TASKMGTRSP: ret = isert_put_tm_rsp(cmd, conn); break; case ISTATE_SEND_REJECT: ret = isert_put_reject(cmd, conn); break; case ISTATE_SEND_TEXTRSP: ret = isert_put_text_rsp(cmd, conn); break; case ISTATE_SEND_STATUS: /* * Special case for sending non GOOD SCSI status from TX thread * context during pre se_cmd excecution failure. */ ret = isert_put_response(conn, cmd); break; default: pr_err("Unknown response state: 0x%02x\n", state); ret = -EINVAL; break; } return ret; } static int isert_setup_np(struct iscsi_np *np, struct __kernel_sockaddr_storage *ksockaddr) { struct isert_np *isert_np; struct rdma_cm_id *isert_lid; struct sockaddr *sa; int ret; isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL); if (!isert_np) { pr_err("Unable to allocate struct isert_np\n"); return -ENOMEM; } sema_init(&isert_np->np_sem, 0); mutex_init(&isert_np->np_accept_mutex); INIT_LIST_HEAD(&isert_np->np_accept_list); init_completion(&isert_np->np_login_comp); sa = (struct sockaddr *)ksockaddr; pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa); /* * Setup the np->np_sockaddr from the passed sockaddr setup * in iscsi_target_configfs.c code.. */ memcpy(&np->np_sockaddr, ksockaddr, sizeof(struct __kernel_sockaddr_storage)); isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP, IB_QPT_RC); if (IS_ERR(isert_lid)) { pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n", PTR_ERR(isert_lid)); ret = PTR_ERR(isert_lid); goto out; } ret = rdma_bind_addr(isert_lid, sa); if (ret) { pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret); goto out_lid; } ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG); if (ret) { pr_err("rdma_listen() for isert_lid failed: %d\n", ret); goto out_lid; } isert_np->np_cm_id = isert_lid; np->np_context = isert_np; pr_debug("Setup isert_lid->context: %p\n", isert_lid->context); return 0; out_lid: rdma_destroy_id(isert_lid); out: kfree(isert_np); return ret; } static int isert_rdma_accept(struct isert_conn *isert_conn) { struct rdma_cm_id *cm_id = isert_conn->conn_cm_id; struct rdma_conn_param cp; int ret; memset(&cp, 0, sizeof(struct rdma_conn_param)); cp.responder_resources = isert_conn->responder_resources; cp.initiator_depth = isert_conn->initiator_depth; cp.retry_count = 7; cp.rnr_retry_count = 7; pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n"); ret = rdma_accept(cm_id, &cp); if (ret) { pr_err("rdma_accept() failed with: %d\n", ret); return ret; } pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n"); return 0; } static int isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) { struct isert_conn *isert_conn = (struct isert_conn *)conn->context; int ret; pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn); /* * For login requests after the first PDU, isert_rx_login_req() will * kick schedule_delayed_work(&conn->login_work) as the packet is * received, which turns this callback from iscsi_target_do_login_rx() * into a NOP. */ if (!login->first_request) return 0; ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp); if (ret) return ret; pr_debug("isert_get_login_rx processing login->req: %p\n", login->req); return 0; } static void isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn, struct isert_conn *isert_conn) { struct rdma_cm_id *cm_id = isert_conn->conn_cm_id; struct rdma_route *cm_route = &cm_id->route; struct sockaddr_in *sock_in; struct sockaddr_in6 *sock_in6; conn->login_family = np->np_sockaddr.ss_family; if (np->np_sockaddr.ss_family == AF_INET6) { sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr; snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c", &sock_in6->sin6_addr.in6_u); conn->login_port = ntohs(sock_in6->sin6_port); sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr; snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c", &sock_in6->sin6_addr.in6_u); conn->local_port = ntohs(sock_in6->sin6_port); } else { sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr; sprintf(conn->login_ip, "%pI4", &sock_in->sin_addr.s_addr); conn->login_port = ntohs(sock_in->sin_port); sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr; sprintf(conn->local_ip, "%pI4", &sock_in->sin_addr.s_addr); conn->local_port = ntohs(sock_in->sin_port); } } static int isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) { struct isert_np *isert_np = (struct isert_np *)np->np_context; struct isert_conn *isert_conn; int max_accept = 0, ret; accept_wait: ret = down_interruptible(&isert_np->np_sem); if (max_accept > 5) return -ENODEV; spin_lock_bh(&np->np_thread_lock); if (np->np_thread_state == ISCSI_NP_THREAD_RESET) { spin_unlock_bh(&np->np_thread_lock); pr_debug("ISCSI_NP_THREAD_RESET for isert_accept_np\n"); return -ENODEV; } spin_unlock_bh(&np->np_thread_lock); mutex_lock(&isert_np->np_accept_mutex); if (list_empty(&isert_np->np_accept_list)) { mutex_unlock(&isert_np->np_accept_mutex); max_accept++; goto accept_wait; } isert_conn = list_first_entry(&isert_np->np_accept_list, struct isert_conn, conn_accept_node); list_del_init(&isert_conn->conn_accept_node); mutex_unlock(&isert_np->np_accept_mutex); conn->context = isert_conn; isert_conn->conn = conn; max_accept = 0; ret = isert_rdma_post_recvl(isert_conn); if (ret) return ret; ret = isert_rdma_accept(isert_conn); if (ret) return ret; isert_set_conn_info(np, conn, isert_conn); pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn); return 0; } static void isert_free_np(struct iscsi_np *np) { struct isert_np *isert_np = (struct isert_np *)np->np_context; rdma_destroy_id(isert_np->np_cm_id); np->np_context = NULL; kfree(isert_np); } static void isert_wait_conn(struct iscsi_conn *conn) { struct isert_conn *isert_conn = conn->context; pr_debug("isert_wait_conn: Starting \n"); /* * Decrement post_send_buf_count for special case when called * from isert_do_control_comp() -> iscsit_logout_post_handler() */ mutex_lock(&isert_conn->conn_mutex); if (isert_conn->logout_posted) atomic_dec(&isert_conn->post_send_buf_count); if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) { pr_debug("Calling rdma_disconnect from isert_wait_conn\n"); rdma_disconnect(isert_conn->conn_cm_id); } /* * Only wait for conn_wait_comp_err if the isert_conn made it * into full feature phase.. */ if (isert_conn->state == ISER_CONN_INIT) { mutex_unlock(&isert_conn->conn_mutex); return; } if (isert_conn->state == ISER_CONN_UP) isert_conn->state = ISER_CONN_TERMINATING; mutex_unlock(&isert_conn->conn_mutex); wait_for_completion(&isert_conn->conn_wait_comp_err); wait_for_completion(&isert_conn->conn_wait); } static void isert_free_conn(struct iscsi_conn *conn) { struct isert_conn *isert_conn = conn->context; isert_put_conn(isert_conn); } static struct iscsit_transport iser_target_transport = { .name = "IB/iSER", .transport_type = ISCSI_INFINIBAND, .priv_size = sizeof(struct isert_cmd), .owner = THIS_MODULE, .iscsit_setup_np = isert_setup_np, .iscsit_accept_np = isert_accept_np, .iscsit_free_np = isert_free_np, .iscsit_wait_conn = isert_wait_conn, .iscsit_free_conn = isert_free_conn, .iscsit_get_login_rx = isert_get_login_rx, .iscsit_put_login_tx = isert_put_login_tx, .iscsit_immediate_queue = isert_immediate_queue, .iscsit_response_queue = isert_response_queue, .iscsit_get_dataout = isert_get_dataout, .iscsit_queue_data_in = isert_put_datain, .iscsit_queue_status = isert_put_response, }; static int __init isert_init(void) { int ret; isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0); if (!isert_rx_wq) { pr_err("Unable to allocate isert_rx_wq\n"); return -ENOMEM; } isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0); if (!isert_comp_wq) { pr_err("Unable to allocate isert_comp_wq\n"); ret = -ENOMEM; goto destroy_rx_wq; } iscsit_register_transport(&iser_target_transport); pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n"); return 0; destroy_rx_wq: destroy_workqueue(isert_rx_wq); return ret; } static void __exit isert_exit(void) { destroy_workqueue(isert_comp_wq); destroy_workqueue(isert_rx_wq); iscsit_unregister_transport(&iser_target_transport); pr_debug("iSER_TARGET[0] - Released iser_target_transport\n"); } MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure"); MODULE_VERSION("0.1"); MODULE_AUTHOR("nab@Linux-iSCSI.org"); MODULE_LICENSE("GPL"); module_init(isert_init); module_exit(isert_exit);