| // SPDX-License-Identifier: GPL-2.0-or-later |
| /******************************************************************************* |
| * This file contains iSCSI extentions for RDMA (iSER) Verbs |
| * |
| * (c) Copyright 2013 Datera, Inc. |
| * |
| * Nicholas A. Bellinger <nab@linux-iscsi.org> |
| * |
| ****************************************************************************/ |
| |
| #include <linux/string.h> |
| #include <linux/module.h> |
| #include <linux/scatterlist.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/in6.h> |
| #include <rdma/ib_verbs.h> |
| #include <rdma/rdma_cm.h> |
| #include <target/target_core_base.h> |
| #include <target/target_core_fabric.h> |
| #include <target/iscsi/iscsi_transport.h> |
| #include <linux/semaphore.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 + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN) |
| #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \ |
| ISERT_MAX_CONN) |
| |
| static int isert_debug_level; |
| module_param_named(debug_level, isert_debug_level, int, 0644); |
| MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)"); |
| |
| static DEFINE_MUTEX(device_list_mutex); |
| static LIST_HEAD(device_list); |
| static struct workqueue_struct *isert_comp_wq; |
| static struct workqueue_struct *isert_release_wq; |
| |
| static int |
| isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd); |
| static int |
| isert_login_post_recv(struct isert_conn *isert_conn); |
| static int |
| isert_rdma_accept(struct isert_conn *isert_conn); |
| struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np); |
| |
| static void isert_release_work(struct work_struct *work); |
| static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc); |
| static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc); |
| static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc); |
| static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc); |
| |
| static inline bool |
| isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd) |
| { |
| return (conn->pi_support && |
| cmd->prot_op != TARGET_PROT_NORMAL); |
| } |
| |
| |
| static void |
| isert_qp_event_callback(struct ib_event *e, void *context) |
| { |
| struct isert_conn *isert_conn = context; |
| |
| isert_err("%s (%d): conn %p\n", |
| ib_event_msg(e->event), e->event, isert_conn); |
| |
| switch (e->event) { |
| case IB_EVENT_COMM_EST: |
| rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST); |
| break; |
| case IB_EVENT_QP_LAST_WQE_REACHED: |
| isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n"); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static struct isert_comp * |
| isert_comp_get(struct isert_conn *isert_conn) |
| { |
| struct isert_device *device = isert_conn->device; |
| struct isert_comp *comp; |
| int i, min = 0; |
| |
| mutex_lock(&device_list_mutex); |
| for (i = 0; i < device->comps_used; i++) |
| if (device->comps[i].active_qps < |
| device->comps[min].active_qps) |
| min = i; |
| comp = &device->comps[min]; |
| comp->active_qps++; |
| mutex_unlock(&device_list_mutex); |
| |
| isert_info("conn %p, using comp %p min_index: %d\n", |
| isert_conn, comp, min); |
| |
| return comp; |
| } |
| |
| static void |
| isert_comp_put(struct isert_comp *comp) |
| { |
| mutex_lock(&device_list_mutex); |
| comp->active_qps--; |
| mutex_unlock(&device_list_mutex); |
| } |
| |
| static struct ib_qp * |
| isert_create_qp(struct isert_conn *isert_conn, |
| struct isert_comp *comp, |
| struct rdma_cm_id *cma_id) |
| { |
| struct isert_device *device = isert_conn->device; |
| struct ib_qp_init_attr attr; |
| int ret; |
| |
| memset(&attr, 0, sizeof(struct ib_qp_init_attr)); |
| attr.event_handler = isert_qp_event_callback; |
| attr.qp_context = isert_conn; |
| attr.send_cq = comp->cq; |
| attr.recv_cq = comp->cq; |
| attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1; |
| attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1; |
| attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX; |
| attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge; |
| attr.cap.max_recv_sge = 1; |
| attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| attr.qp_type = IB_QPT_RC; |
| if (device->pi_capable) |
| attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN; |
| |
| ret = rdma_create_qp(cma_id, device->pd, &attr); |
| if (ret) { |
| isert_err("rdma_create_qp failed for cma_id %d\n", ret); |
| return ERR_PTR(ret); |
| } |
| |
| return cma_id->qp; |
| } |
| |
| static int |
| isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id) |
| { |
| struct isert_comp *comp; |
| int ret; |
| |
| comp = isert_comp_get(isert_conn); |
| isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id); |
| if (IS_ERR(isert_conn->qp)) { |
| ret = PTR_ERR(isert_conn->qp); |
| goto err; |
| } |
| |
| return 0; |
| err: |
| isert_comp_put(comp); |
| return ret; |
| } |
| |
| static int |
| isert_alloc_rx_descriptors(struct isert_conn *isert_conn) |
| { |
| struct isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_device; |
| struct iser_rx_desc *rx_desc; |
| struct ib_sge *rx_sg; |
| u64 dma_addr; |
| int i, j; |
| |
| isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS, |
| sizeof(struct iser_rx_desc), |
| GFP_KERNEL); |
| if (!isert_conn->rx_descs) |
| return -ENOMEM; |
| |
| rx_desc = isert_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 = device->pd->local_dma_lkey; |
| rx_desc->rx_cqe.done = isert_recv_done; |
| } |
| |
| return 0; |
| |
| dma_map_fail: |
| rx_desc = isert_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->rx_descs); |
| isert_conn->rx_descs = NULL; |
| isert_err("conn %p failed to allocate rx descriptors\n", isert_conn); |
| return -ENOMEM; |
| } |
| |
| static void |
| isert_free_rx_descriptors(struct isert_conn *isert_conn) |
| { |
| struct ib_device *ib_dev = isert_conn->device->ib_device; |
| struct iser_rx_desc *rx_desc; |
| int i; |
| |
| if (!isert_conn->rx_descs) |
| return; |
| |
| rx_desc = isert_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->rx_descs); |
| isert_conn->rx_descs = NULL; |
| } |
| |
| static void |
| isert_free_comps(struct isert_device *device) |
| { |
| int i; |
| |
| for (i = 0; i < device->comps_used; i++) { |
| struct isert_comp *comp = &device->comps[i]; |
| |
| if (comp->cq) |
| ib_free_cq(comp->cq); |
| } |
| kfree(device->comps); |
| } |
| |
| static int |
| isert_alloc_comps(struct isert_device *device) |
| { |
| int i, max_cqe, ret = 0; |
| |
| device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(), |
| device->ib_device->num_comp_vectors)); |
| |
| isert_info("Using %d CQs, %s supports %d vectors support " |
| "pi_capable %d\n", |
| device->comps_used, dev_name(&device->ib_device->dev), |
| device->ib_device->num_comp_vectors, |
| device->pi_capable); |
| |
| device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp), |
| GFP_KERNEL); |
| if (!device->comps) |
| return -ENOMEM; |
| |
| max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe); |
| |
| for (i = 0; i < device->comps_used; i++) { |
| struct isert_comp *comp = &device->comps[i]; |
| |
| comp->device = device; |
| comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i, |
| IB_POLL_WORKQUEUE); |
| if (IS_ERR(comp->cq)) { |
| isert_err("Unable to allocate cq\n"); |
| ret = PTR_ERR(comp->cq); |
| comp->cq = NULL; |
| goto out_cq; |
| } |
| } |
| |
| return 0; |
| out_cq: |
| isert_free_comps(device); |
| return ret; |
| } |
| |
| static int |
| isert_create_device_ib_res(struct isert_device *device) |
| { |
| struct ib_device *ib_dev = device->ib_device; |
| int ret; |
| |
| isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n", |
| ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge); |
| isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd); |
| |
| ret = isert_alloc_comps(device); |
| if (ret) |
| goto out; |
| |
| device->pd = ib_alloc_pd(ib_dev, 0); |
| if (IS_ERR(device->pd)) { |
| ret = PTR_ERR(device->pd); |
| isert_err("failed to allocate pd, device %p, ret=%d\n", |
| device, ret); |
| goto out_cq; |
| } |
| |
| /* Check signature cap */ |
| device->pi_capable = ib_dev->attrs.device_cap_flags & |
| IB_DEVICE_INTEGRITY_HANDOVER ? true : false; |
| |
| return 0; |
| |
| out_cq: |
| isert_free_comps(device); |
| out: |
| if (ret > 0) |
| ret = -EINVAL; |
| return ret; |
| } |
| |
| static void |
| isert_free_device_ib_res(struct isert_device *device) |
| { |
| isert_info("device %p\n", device); |
| |
| ib_dealloc_pd(device->pd); |
| isert_free_comps(device); |
| } |
| |
| static void |
| isert_device_put(struct isert_device *device) |
| { |
| mutex_lock(&device_list_mutex); |
| device->refcount--; |
| isert_info("device %p refcount %d\n", device, 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_get(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++; |
| isert_info("Found iser device %p refcount %d\n", |
| device, 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); |
| isert_info("Created a new iser device %p refcount %d\n", |
| device, device->refcount); |
| mutex_unlock(&device_list_mutex); |
| |
| return device; |
| } |
| |
| static void |
| isert_init_conn(struct isert_conn *isert_conn) |
| { |
| isert_conn->state = ISER_CONN_INIT; |
| INIT_LIST_HEAD(&isert_conn->node); |
| init_completion(&isert_conn->login_comp); |
| init_completion(&isert_conn->login_req_comp); |
| init_waitqueue_head(&isert_conn->rem_wait); |
| kref_init(&isert_conn->kref); |
| mutex_init(&isert_conn->mutex); |
| INIT_WORK(&isert_conn->release_work, isert_release_work); |
| } |
| |
| static void |
| isert_free_login_buf(struct isert_conn *isert_conn) |
| { |
| struct ib_device *ib_dev = isert_conn->device->ib_device; |
| |
| ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, |
| ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE); |
| kfree(isert_conn->login_rsp_buf); |
| |
| ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, |
| ISER_RX_PAYLOAD_SIZE, |
| DMA_FROM_DEVICE); |
| kfree(isert_conn->login_req_buf); |
| } |
| |
| static int |
| isert_alloc_login_buf(struct isert_conn *isert_conn, |
| struct ib_device *ib_dev) |
| { |
| int ret; |
| |
| isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf), |
| GFP_KERNEL); |
| if (!isert_conn->login_req_buf) |
| return -ENOMEM; |
| |
| isert_conn->login_req_dma = ib_dma_map_single(ib_dev, |
| isert_conn->login_req_buf, |
| ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
| ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma); |
| if (ret) { |
| isert_err("login_req_dma mapping error: %d\n", ret); |
| isert_conn->login_req_dma = 0; |
| goto out_free_login_req_buf; |
| } |
| |
| isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL); |
| if (!isert_conn->login_rsp_buf) { |
| ret = -ENOMEM; |
| goto out_unmap_login_req_buf; |
| } |
| |
| isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, |
| isert_conn->login_rsp_buf, |
| ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE); |
| ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); |
| if (ret) { |
| isert_err("login_rsp_dma mapping error: %d\n", ret); |
| isert_conn->login_rsp_dma = 0; |
| goto out_free_login_rsp_buf; |
| } |
| |
| return 0; |
| |
| out_free_login_rsp_buf: |
| kfree(isert_conn->login_rsp_buf); |
| out_unmap_login_req_buf: |
| ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, |
| ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
| out_free_login_req_buf: |
| kfree(isert_conn->login_req_buf); |
| return ret; |
| } |
| |
| static void |
| isert_set_nego_params(struct isert_conn *isert_conn, |
| struct rdma_conn_param *param) |
| { |
| struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs; |
| |
| /* Set max inflight RDMA READ requests */ |
| isert_conn->initiator_depth = min_t(u8, param->initiator_depth, |
| attr->max_qp_init_rd_atom); |
| isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth); |
| |
| if (param->private_data) { |
| u8 flags = *(u8 *)param->private_data; |
| |
| /* |
| * use remote invalidation if the both initiator |
| * and the HCA support it |
| */ |
| isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) && |
| (attr->device_cap_flags & |
| IB_DEVICE_MEM_MGT_EXTENSIONS); |
| if (isert_conn->snd_w_inv) |
| isert_info("Using remote invalidation\n"); |
| } |
| } |
| |
| static int |
| isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) |
| { |
| struct isert_np *isert_np = cma_id->context; |
| struct iscsi_np *np = isert_np->np; |
| struct isert_conn *isert_conn; |
| struct isert_device *device; |
| int ret = 0; |
| |
| spin_lock_bh(&np->np_thread_lock); |
| if (!np->enabled) { |
| spin_unlock_bh(&np->np_thread_lock); |
| isert_dbg("iscsi_np is not enabled, reject connect request\n"); |
| return rdma_reject(cma_id, NULL, 0); |
| } |
| spin_unlock_bh(&np->np_thread_lock); |
| |
| isert_dbg("cma_id: %p, portal: %p\n", |
| cma_id, cma_id->context); |
| |
| isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL); |
| if (!isert_conn) |
| return -ENOMEM; |
| |
| isert_init_conn(isert_conn); |
| isert_conn->cm_id = cma_id; |
| |
| ret = isert_alloc_login_buf(isert_conn, cma_id->device); |
| if (ret) |
| goto out; |
| |
| device = isert_device_get(cma_id); |
| if (IS_ERR(device)) { |
| ret = PTR_ERR(device); |
| goto out_rsp_dma_map; |
| } |
| isert_conn->device = device; |
| |
| isert_set_nego_params(isert_conn, &event->param.conn); |
| |
| ret = isert_conn_setup_qp(isert_conn, cma_id); |
| if (ret) |
| goto out_conn_dev; |
| |
| ret = isert_login_post_recv(isert_conn); |
| if (ret) |
| goto out_conn_dev; |
| |
| ret = isert_rdma_accept(isert_conn); |
| if (ret) |
| goto out_conn_dev; |
| |
| mutex_lock(&isert_np->mutex); |
| list_add_tail(&isert_conn->node, &isert_np->accepted); |
| mutex_unlock(&isert_np->mutex); |
| |
| return 0; |
| |
| out_conn_dev: |
| isert_device_put(device); |
| out_rsp_dma_map: |
| isert_free_login_buf(isert_conn); |
| out: |
| kfree(isert_conn); |
| rdma_reject(cma_id, NULL, 0); |
| return ret; |
| } |
| |
| static void |
| isert_connect_release(struct isert_conn *isert_conn) |
| { |
| struct isert_device *device = isert_conn->device; |
| |
| isert_dbg("conn %p\n", isert_conn); |
| |
| BUG_ON(!device); |
| |
| isert_free_rx_descriptors(isert_conn); |
| if (isert_conn->cm_id && |
| !isert_conn->dev_removed) |
| rdma_destroy_id(isert_conn->cm_id); |
| |
| if (isert_conn->qp) { |
| struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context; |
| |
| isert_comp_put(comp); |
| ib_destroy_qp(isert_conn->qp); |
| } |
| |
| if (isert_conn->login_req_buf) |
| isert_free_login_buf(isert_conn); |
| |
| isert_device_put(device); |
| |
| if (isert_conn->dev_removed) |
| wake_up_interruptible(&isert_conn->rem_wait); |
| else |
| kfree(isert_conn); |
| } |
| |
| static void |
| isert_connected_handler(struct rdma_cm_id *cma_id) |
| { |
| struct isert_conn *isert_conn = cma_id->qp->qp_context; |
| struct isert_np *isert_np = cma_id->context; |
| |
| isert_info("conn %p\n", isert_conn); |
| |
| mutex_lock(&isert_conn->mutex); |
| isert_conn->state = ISER_CONN_UP; |
| kref_get(&isert_conn->kref); |
| mutex_unlock(&isert_conn->mutex); |
| |
| mutex_lock(&isert_np->mutex); |
| list_move_tail(&isert_conn->node, &isert_np->pending); |
| mutex_unlock(&isert_np->mutex); |
| |
| isert_info("np %p: Allow accept_np to continue\n", isert_np); |
| up(&isert_np->sem); |
| } |
| |
| static void |
| isert_release_kref(struct kref *kref) |
| { |
| struct isert_conn *isert_conn = container_of(kref, |
| struct isert_conn, kref); |
| |
| isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm, |
| current->pid); |
| |
| isert_connect_release(isert_conn); |
| } |
| |
| static void |
| isert_put_conn(struct isert_conn *isert_conn) |
| { |
| kref_put(&isert_conn->kref, isert_release_kref); |
| } |
| |
| static void |
| isert_handle_unbound_conn(struct isert_conn *isert_conn) |
| { |
| struct isert_np *isert_np = isert_conn->cm_id->context; |
| |
| mutex_lock(&isert_np->mutex); |
| if (!list_empty(&isert_conn->node)) { |
| /* |
| * This means iscsi doesn't know this connection |
| * so schedule a cleanup ourselves |
| */ |
| list_del_init(&isert_conn->node); |
| isert_put_conn(isert_conn); |
| queue_work(isert_release_wq, &isert_conn->release_work); |
| } |
| mutex_unlock(&isert_np->mutex); |
| } |
| |
| /** |
| * isert_conn_terminate() - Initiate connection termination |
| * @isert_conn: isert connection struct |
| * |
| * Notes: |
| * In case the connection state is BOUND, move state |
| * to TEMINATING and start teardown sequence (rdma_disconnect). |
| * In case the connection state is UP, complete flush as well. |
| * |
| * This routine must be called with mutex held. Thus it is |
| * safe to call multiple times. |
| */ |
| static void |
| isert_conn_terminate(struct isert_conn *isert_conn) |
| { |
| int err; |
| |
| if (isert_conn->state >= ISER_CONN_TERMINATING) |
| return; |
| |
| isert_info("Terminating conn %p state %d\n", |
| isert_conn, isert_conn->state); |
| isert_conn->state = ISER_CONN_TERMINATING; |
| err = rdma_disconnect(isert_conn->cm_id); |
| if (err) |
| isert_warn("Failed rdma_disconnect isert_conn %p\n", |
| isert_conn); |
| } |
| |
| static int |
| isert_np_cma_handler(struct isert_np *isert_np, |
| enum rdma_cm_event_type event) |
| { |
| isert_dbg("%s (%d): isert np %p\n", |
| rdma_event_msg(event), event, isert_np); |
| |
| switch (event) { |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| isert_np->cm_id = NULL; |
| break; |
| case RDMA_CM_EVENT_ADDR_CHANGE: |
| isert_np->cm_id = isert_setup_id(isert_np); |
| if (IS_ERR(isert_np->cm_id)) { |
| isert_err("isert np %p setup id failed: %ld\n", |
| isert_np, PTR_ERR(isert_np->cm_id)); |
| isert_np->cm_id = NULL; |
| } |
| break; |
| default: |
| isert_err("isert np %p Unexpected event %d\n", |
| isert_np, event); |
| } |
| |
| return -1; |
| } |
| |
| static int |
| isert_disconnected_handler(struct rdma_cm_id *cma_id, |
| enum rdma_cm_event_type event) |
| { |
| struct isert_conn *isert_conn = cma_id->qp->qp_context; |
| |
| mutex_lock(&isert_conn->mutex); |
| switch (isert_conn->state) { |
| case ISER_CONN_TERMINATING: |
| break; |
| case ISER_CONN_UP: |
| isert_conn_terminate(isert_conn); |
| ib_drain_qp(isert_conn->qp); |
| isert_handle_unbound_conn(isert_conn); |
| break; |
| case ISER_CONN_BOUND: |
| case ISER_CONN_FULL_FEATURE: /* FALLTHRU */ |
| iscsit_cause_connection_reinstatement(isert_conn->conn, 0); |
| break; |
| default: |
| isert_warn("conn %p terminating in state %d\n", |
| isert_conn, isert_conn->state); |
| } |
| mutex_unlock(&isert_conn->mutex); |
| |
| return 0; |
| } |
| |
| static int |
| isert_connect_error(struct rdma_cm_id *cma_id) |
| { |
| struct isert_conn *isert_conn = cma_id->qp->qp_context; |
| |
| ib_drain_qp(isert_conn->qp); |
| list_del_init(&isert_conn->node); |
| isert_conn->cm_id = NULL; |
| isert_put_conn(isert_conn); |
| |
| return -1; |
| } |
| |
| static int |
| isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) |
| { |
| struct isert_np *isert_np = cma_id->context; |
| struct isert_conn *isert_conn; |
| int ret = 0; |
| |
| isert_info("%s (%d): status %d id %p np %p\n", |
| rdma_event_msg(event->event), event->event, |
| event->status, cma_id, cma_id->context); |
| |
| if (isert_np->cm_id == cma_id) |
| return isert_np_cma_handler(cma_id->context, event->event); |
| |
| switch (event->event) { |
| case RDMA_CM_EVENT_CONNECT_REQUEST: |
| ret = isert_connect_request(cma_id, event); |
| if (ret) |
| isert_err("failed handle connect request %d\n", ret); |
| break; |
| case RDMA_CM_EVENT_ESTABLISHED: |
| isert_connected_handler(cma_id); |
| break; |
| case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */ |
| case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */ |
| case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */ |
| ret = isert_disconnected_handler(cma_id, event->event); |
| break; |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| isert_conn = cma_id->qp->qp_context; |
| isert_conn->dev_removed = true; |
| isert_disconnected_handler(cma_id, event->event); |
| wait_event_interruptible(isert_conn->rem_wait, |
| isert_conn->state == ISER_CONN_DOWN); |
| kfree(isert_conn); |
| /* |
| * return non-zero from the callback to destroy |
| * the rdma cm id |
| */ |
| return 1; |
| case RDMA_CM_EVENT_REJECTED: |
| isert_info("Connection rejected: %s\n", |
| rdma_reject_msg(cma_id, event->status)); |
| /* fall through */ |
| case RDMA_CM_EVENT_UNREACHABLE: |
| case RDMA_CM_EVENT_CONNECT_ERROR: |
| ret = isert_connect_error(cma_id); |
| break; |
| default: |
| isert_err("Unhandled RDMA CMA event: %d\n", event->event); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int |
| isert_post_recvm(struct isert_conn *isert_conn, u32 count) |
| { |
| struct ib_recv_wr *rx_wr; |
| int i, ret; |
| struct iser_rx_desc *rx_desc; |
| |
| for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { |
| rx_desc = &isert_conn->rx_descs[i]; |
| |
| rx_wr->wr_cqe = &rx_desc->rx_cqe; |
| rx_wr->sg_list = &rx_desc->rx_sg; |
| rx_wr->num_sge = 1; |
| rx_wr->next = rx_wr + 1; |
| rx_desc->in_use = false; |
| } |
| rx_wr--; |
| rx_wr->next = NULL; /* mark end of work requests list */ |
| |
| ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL); |
| if (ret) |
| isert_err("ib_post_recv() failed with ret: %d\n", ret); |
| |
| return ret; |
| } |
| |
| static int |
| isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc) |
| { |
| struct ib_recv_wr rx_wr; |
| int ret; |
| |
| if (!rx_desc->in_use) { |
| /* |
| * if the descriptor is not in-use we already reposted it |
| * for recv, so just silently return |
| */ |
| return 0; |
| } |
| |
| rx_desc->in_use = false; |
| rx_wr.wr_cqe = &rx_desc->rx_cqe; |
| rx_wr.sg_list = &rx_desc->rx_sg; |
| rx_wr.num_sge = 1; |
| rx_wr.next = NULL; |
| |
| ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL); |
| if (ret) |
| isert_err("ib_post_recv() failed with ret: %d\n", ret); |
| |
| return ret; |
| } |
| |
| static int |
| isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) |
| { |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| struct ib_send_wr send_wr; |
| int ret; |
| |
| ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, |
| ISER_HEADERS_LEN, DMA_TO_DEVICE); |
| |
| tx_desc->tx_cqe.done = isert_login_send_done; |
| |
| send_wr.next = NULL; |
| send_wr.wr_cqe = &tx_desc->tx_cqe; |
| 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; |
| |
| ret = ib_post_send(isert_conn->qp, &send_wr, NULL); |
| if (ret) |
| isert_err("ib_post_send() failed, ret: %d\n", ret); |
| |
| return ret; |
| } |
| |
| static void |
| __isert_create_send_desc(struct isert_device *device, |
| struct iser_tx_desc *tx_desc) |
| { |
| |
| memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl)); |
| tx_desc->iser_header.flags = ISCSI_CTRL; |
| |
| tx_desc->num_sge = 1; |
| |
| if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) { |
| tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; |
| isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc); |
| } |
| } |
| |
| static void |
| isert_create_send_desc(struct isert_conn *isert_conn, |
| struct isert_cmd *isert_cmd, |
| struct iser_tx_desc *tx_desc) |
| { |
| struct isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_device; |
| |
| ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr, |
| ISER_HEADERS_LEN, DMA_TO_DEVICE); |
| |
| __isert_create_send_desc(device, tx_desc); |
| } |
| |
| static int |
| isert_init_tx_hdrs(struct isert_conn *isert_conn, |
| struct iser_tx_desc *tx_desc) |
| { |
| struct isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_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)) { |
| isert_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 = device->pd->local_dma_lkey; |
| |
| isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\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) |
| { |
| struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc; |
| |
| tx_desc->tx_cqe.done = isert_send_done; |
| send_wr->wr_cqe = &tx_desc->tx_cqe; |
| |
| if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) { |
| send_wr->opcode = IB_WR_SEND_WITH_INV; |
| send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey; |
| } else { |
| 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; |
| send_wr->send_flags = IB_SEND_SIGNALED; |
| } |
| |
| static int |
| isert_login_post_recv(struct isert_conn *isert_conn) |
| { |
| struct ib_recv_wr rx_wr; |
| struct ib_sge sge; |
| int ret; |
| |
| memset(&sge, 0, sizeof(struct ib_sge)); |
| sge.addr = isert_conn->login_req_dma; |
| sge.length = ISER_RX_PAYLOAD_SIZE; |
| sge.lkey = isert_conn->device->pd->local_dma_lkey; |
| |
| isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n", |
| sge.addr, sge.length, sge.lkey); |
| |
| isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done; |
| |
| memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); |
| rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe; |
| rx_wr.sg_list = &sge; |
| rx_wr.num_sge = 1; |
| |
| ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL); |
| if (ret) |
| isert_err("ib_post_recv() failed: %d\n", ret); |
| |
| 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 isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_device; |
| struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc; |
| int ret; |
| |
| __isert_create_send_desc(device, 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->device->pd->local_dma_lkey; |
| tx_desc->num_sge = 2; |
| } |
| if (!login->login_failed) { |
| if (login->login_complete) { |
| ret = isert_alloc_rx_descriptors(isert_conn); |
| if (ret) |
| return ret; |
| |
| ret = isert_post_recvm(isert_conn, |
| ISERT_QP_MAX_RECV_DTOS); |
| if (ret) |
| return ret; |
| |
| /* Now we are in FULL_FEATURE phase */ |
| mutex_lock(&isert_conn->mutex); |
| isert_conn->state = ISER_CONN_FULL_FEATURE; |
| mutex_unlock(&isert_conn->mutex); |
| goto post_send; |
| } |
| |
| ret = isert_login_post_recv(isert_conn); |
| if (ret) |
| return ret; |
| } |
| post_send: |
| ret = isert_login_post_send(isert_conn, tx_desc); |
| if (ret) |
| return ret; |
| |
| return 0; |
| } |
| |
| static void |
| isert_rx_login_req(struct isert_conn *isert_conn) |
| { |
| struct iser_rx_desc *rx_desc = isert_conn->login_req_buf; |
| int rx_buflen = isert_conn->login_req_len; |
| struct iscsi_conn *conn = isert_conn->conn; |
| struct iscsi_login *login = conn->conn_login; |
| int size; |
| |
| isert_info("conn %p\n", isert_conn); |
| |
| WARN_ON_ONCE(!login); |
| |
| 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); |
| isert_dbg("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->login_comp); |
| return; |
| } |
| schedule_delayed_work(&conn->login_work, 0); |
| } |
| |
| static struct iscsi_cmd |
| *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc) |
| { |
| struct isert_conn *isert_conn = conn->context; |
| struct isert_cmd *isert_cmd; |
| struct iscsi_cmd *cmd; |
| |
| cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); |
| if (!cmd) { |
| isert_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; |
| isert_cmd->rx_desc = rx_desc; |
| |
| 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; |
| int imm_data, imm_data_len, unsol_data, sg_nents, rc; |
| bool dump_payload = false; |
| unsigned int data_len; |
| |
| 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; |
| data_len = cmd->se_cmd.data_length; |
| |
| if (imm_data && imm_data_len == data_len) |
| cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
| 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; |
| |
| if (imm_data_len != data_len) { |
| sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE)); |
| sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents, |
| &rx_desc->data[0], imm_data_len); |
| isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n", |
| sg_nents, imm_data_len); |
| } else { |
| sg_init_table(&isert_cmd->sg, 1); |
| cmd->se_cmd.t_data_sg = &isert_cmd->sg; |
| cmd->se_cmd.t_data_nents = 1; |
| sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len); |
| isert_dbg("Transfer Immediate imm_data_len: %d\n", |
| 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_unsolicited_dataout(cmd); |
| else if (dump_payload && imm_data) |
| target_put_sess_cmd(&cmd->se_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) { |
| isert_err("Received unexpected solicited data payload\n"); |
| dump_stack(); |
| return -1; |
| } |
| |
| isert_dbg("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) { |
| isert_err("unexpected non-page aligned data payload\n"); |
| dump_stack(); |
| return -1; |
| } |
| isert_dbg("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; |
| |
| /* |
| * multiple data-outs on the same command can arrive - |
| * so post the buffer before hand |
| */ |
| rc = isert_post_recv(isert_conn, rx_desc); |
| if (rc) { |
| isert_err("ib_post_recv failed with %d\n", rc); |
| 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 = NULL; |
| |
| rc = iscsit_setup_text_cmd(conn, cmd, hdr); |
| if (rc < 0) |
| return rc; |
| |
| if (payload_length) { |
| text_in = kzalloc(payload_length, GFP_KERNEL); |
| if (!text_in) |
| 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_cmd *cmd; |
| struct isert_cmd *isert_cmd; |
| int ret = -EINVAL; |
| u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); |
| |
| if (conn->sess->sess_ops->SessionType && |
| (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) { |
| isert_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, rx_desc); |
| 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; |
| isert_cmd->inv_rkey = read_stag ? read_stag : write_stag; |
| |
| 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, rx_desc); |
| 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, rx_desc); |
| if (!cmd) |
| break; |
| |
| ret = iscsit_handle_task_mgt_cmd(conn, cmd, |
| (unsigned char *)hdr); |
| break; |
| case ISCSI_OP_LOGOUT: |
| cmd = isert_allocate_cmd(conn, rx_desc); |
| if (!cmd) |
| break; |
| |
| ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); |
| break; |
| case ISCSI_OP_TEXT: |
| if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) |
| cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); |
| else |
| cmd = isert_allocate_cmd(conn, rx_desc); |
| |
| 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: |
| isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); |
| dump_stack(); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static void |
| isert_print_wc(struct ib_wc *wc, const char *type) |
| { |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| isert_err("%s failure: %s (%d) vend_err %x\n", type, |
| ib_wc_status_msg(wc->status), wc->status, |
| wc->vendor_err); |
| else |
| isert_dbg("%s failure: %s (%d)\n", type, |
| ib_wc_status_msg(wc->status), wc->status); |
| } |
| |
| static void |
| isert_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct isert_conn *isert_conn = wc->qp->qp_context; |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe); |
| struct iscsi_hdr *hdr = &rx_desc->iscsi_header; |
| struct iser_ctrl *iser_ctrl = &rx_desc->iser_header; |
| uint64_t read_va = 0, write_va = 0; |
| uint32_t read_stag = 0, write_stag = 0; |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS)) { |
| isert_print_wc(wc, "recv"); |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| iscsit_cause_connection_reinstatement(isert_conn->conn, 0); |
| return; |
| } |
| |
| rx_desc->in_use = true; |
| |
| ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr, |
| ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
| |
| isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", |
| rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags, |
| (int)(wc->byte_len - ISER_HEADERS_LEN)); |
| |
| switch (iser_ctrl->flags & 0xF0) { |
| case ISCSI_CTRL: |
| if (iser_ctrl->flags & ISER_RSV) { |
| read_stag = be32_to_cpu(iser_ctrl->read_stag); |
| read_va = be64_to_cpu(iser_ctrl->read_va); |
| isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n", |
| read_stag, (unsigned long long)read_va); |
| } |
| if (iser_ctrl->flags & ISER_WSV) { |
| write_stag = be32_to_cpu(iser_ctrl->write_stag); |
| write_va = be64_to_cpu(iser_ctrl->write_va); |
| isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n", |
| write_stag, (unsigned long long)write_va); |
| } |
| |
| isert_dbg("ISER ISCSI_CTRL PDU\n"); |
| break; |
| case ISER_HELLO: |
| isert_err("iSER Hello message\n"); |
| break; |
| default: |
| isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags); |
| break; |
| } |
| |
| isert_rx_opcode(isert_conn, rx_desc, |
| read_stag, read_va, write_stag, write_va); |
| |
| ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr, |
| ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
| } |
| |
| static void |
| isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct isert_conn *isert_conn = wc->qp->qp_context; |
| struct ib_device *ib_dev = isert_conn->device->ib_device; |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS)) { |
| isert_print_wc(wc, "login recv"); |
| return; |
| } |
| |
| ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma, |
| ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
| |
| isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN; |
| |
| if (isert_conn->conn) { |
| struct iscsi_login *login = isert_conn->conn->conn_login; |
| |
| if (login && !login->first_request) |
| isert_rx_login_req(isert_conn); |
| } |
| |
| mutex_lock(&isert_conn->mutex); |
| complete(&isert_conn->login_req_comp); |
| mutex_unlock(&isert_conn->mutex); |
| |
| ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma, |
| ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
| } |
| |
| static void |
| isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn) |
| { |
| struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd; |
| enum dma_data_direction dir = target_reverse_dma_direction(se_cmd); |
| |
| if (!cmd->rw.nr_ops) |
| return; |
| |
| if (isert_prot_cmd(conn, se_cmd)) { |
| rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp, |
| conn->cm_id->port_num, se_cmd->t_data_sg, |
| se_cmd->t_data_nents, se_cmd->t_prot_sg, |
| se_cmd->t_prot_nents, dir); |
| } else { |
| rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num, |
| se_cmd->t_data_sg, se_cmd->t_data_nents, dir); |
| } |
| |
| cmd->rw.nr_ops = 0; |
| } |
| |
| 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 iscsi_text_rsp *hdr; |
| |
| isert_dbg("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); |
| } |
| } |
| |
| isert_rdma_rw_ctx_destroy(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: |
| hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; |
| /* If the continue bit is on, keep the command alive */ |
| if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE) |
| break; |
| |
| 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) { |
| isert_dbg("Calling transport_generic_free_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) { |
| isert_dbg("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) { |
| isert_dbg("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 int |
| isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr) |
| { |
| struct ib_mr_status mr_status; |
| int ret; |
| |
| ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status); |
| if (ret) { |
| isert_err("ib_check_mr_status failed, ret %d\n", ret); |
| goto fail_mr_status; |
| } |
| |
| if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { |
| u64 sec_offset_err; |
| u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8; |
| |
| switch (mr_status.sig_err.err_type) { |
| case IB_SIG_BAD_GUARD: |
| se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; |
| break; |
| case IB_SIG_BAD_REFTAG: |
| se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; |
| break; |
| case IB_SIG_BAD_APPTAG: |
| se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED; |
| break; |
| } |
| sec_offset_err = mr_status.sig_err.sig_err_offset; |
| do_div(sec_offset_err, block_size); |
| se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba; |
| |
| isert_err("PI error found type %d at sector 0x%llx " |
| "expected 0x%x vs actual 0x%x\n", |
| mr_status.sig_err.err_type, |
| (unsigned long long)se_cmd->bad_sector, |
| mr_status.sig_err.expected, |
| mr_status.sig_err.actual); |
| ret = 1; |
| } |
| |
| fail_mr_status: |
| return ret; |
| } |
| |
| static void |
| isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct isert_conn *isert_conn = wc->qp->qp_context; |
| struct isert_device *device = isert_conn->device; |
| struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe); |
| struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc); |
| struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd; |
| int ret = 0; |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS)) { |
| isert_print_wc(wc, "rdma write"); |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| iscsit_cause_connection_reinstatement(isert_conn->conn, 0); |
| isert_completion_put(desc, isert_cmd, device->ib_device, true); |
| return; |
| } |
| |
| isert_dbg("Cmd %p\n", isert_cmd); |
| |
| ret = isert_check_pi_status(cmd, isert_cmd->rw.reg->mr); |
| isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); |
| |
| if (ret) { |
| /* |
| * transport_generic_request_failure() expects to have |
| * plus two references to handle queue-full, so re-add |
| * one here as target-core will have already dropped |
| * it after the first isert_put_datain() callback. |
| */ |
| kref_get(&cmd->cmd_kref); |
| transport_generic_request_failure(cmd, cmd->pi_err); |
| } else { |
| /* |
| * XXX: isert_put_response() failure is not retried. |
| */ |
| ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd); |
| if (ret) |
| pr_warn_ratelimited("isert_put_response() ret: %d\n", ret); |
| } |
| } |
| |
| static void |
| isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct isert_conn *isert_conn = wc->qp->qp_context; |
| struct isert_device *device = isert_conn->device; |
| struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe); |
| struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc); |
| struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| int ret = 0; |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS)) { |
| isert_print_wc(wc, "rdma read"); |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| iscsit_cause_connection_reinstatement(isert_conn->conn, 0); |
| isert_completion_put(desc, isert_cmd, device->ib_device, true); |
| return; |
| } |
| |
| isert_dbg("Cmd %p\n", isert_cmd); |
| |
| iscsit_stop_dataout_timer(cmd); |
| |
| if (isert_prot_cmd(isert_conn, se_cmd)) |
| ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr); |
| isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); |
| cmd->write_data_done = 0; |
| |
| isert_dbg("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); |
| |
| /* |
| * transport_generic_request_failure() will drop the extra |
| * se_cmd->cmd_kref reference after T10-PI error, and handle |
| * any non-zero ->queue_status() callback error retries. |
| */ |
| if (ret) |
| transport_generic_request_failure(se_cmd, se_cmd->pi_err); |
| else |
| 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->cm_id->device; |
| struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; |
| |
| isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state); |
| |
| switch (cmd->i_state) { |
| case ISTATE_SEND_TASKMGTRSP: |
| iscsit_tmr_post_handler(cmd, cmd->conn); |
| /* fall through */ |
| case ISTATE_SEND_REJECT: |
| case ISTATE_SEND_TEXTRSP: |
| cmd->i_state = ISTATE_SENT_STATUS; |
| isert_completion_put(&isert_cmd->tx_desc, isert_cmd, |
| ib_dev, false); |
| break; |
| case ISTATE_SEND_LOGOUTRSP: |
| iscsit_logout_post_handler(cmd, cmd->conn); |
| break; |
| default: |
| isert_err("Unknown i_state %d\n", cmd->i_state); |
| dump_stack(); |
| break; |
| } |
| } |
| |
| static void |
| isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct isert_conn *isert_conn = wc->qp->qp_context; |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe); |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS)) { |
| isert_print_wc(wc, "login send"); |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| iscsit_cause_connection_reinstatement(isert_conn->conn, 0); |
| } |
| |
| isert_unmap_tx_desc(tx_desc, ib_dev); |
| } |
| |
| static void |
| isert_send_done(struct ib_cq *cq, struct ib_wc *wc) |
| { |
| struct isert_conn *isert_conn = wc->qp->qp_context; |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe); |
| struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc); |
| |
| if (unlikely(wc->status != IB_WC_SUCCESS)) { |
| isert_print_wc(wc, "send"); |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| iscsit_cause_connection_reinstatement(isert_conn->conn, 0); |
| isert_completion_put(tx_desc, isert_cmd, ib_dev, true); |
| return; |
| } |
| |
| isert_dbg("Cmd %p\n", isert_cmd); |
| |
| switch (isert_cmd->iscsi_cmd->i_state) { |
| case ISTATE_SEND_TASKMGTRSP: |
| case ISTATE_SEND_LOGOUTRSP: |
| case ISTATE_SEND_REJECT: |
| case 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; |
| default: |
| isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS; |
| isert_completion_put(tx_desc, isert_cmd, ib_dev, false); |
| break; |
| } |
| } |
| |
| static int |
| isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) |
| { |
| int ret; |
| |
| ret = isert_post_recv(isert_conn, isert_cmd->rx_desc); |
| if (ret) { |
| isert_err("ib_post_recv failed with %d\n", ret); |
| return ret; |
| } |
| |
| ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL); |
| if (ret) { |
| isert_err("ib_post_send failed with %d\n", ret); |
| 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 = 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 isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_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); |
| if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) |
| return -ENOMEM; |
| |
| isert_cmd->pdu_buf_len = pdu_len; |
| tx_dsg->addr = isert_cmd->pdu_buf_dma; |
| tx_dsg->length = pdu_len; |
| tx_dsg->lkey = device->pd->local_dma_lkey; |
| isert_cmd->tx_desc.num_sge = 2; |
| } |
| |
| isert_init_send_wr(isert_conn, isert_cmd, send_wr); |
| |
| isert_dbg("Posting SCSI Response\n"); |
| |
| return isert_post_response(isert_conn, isert_cmd); |
| } |
| |
| static void |
| isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) |
| { |
| struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); |
| struct isert_conn *isert_conn = conn->context; |
| |
| 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); |
| isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); |
| } |
| |
| static enum target_prot_op |
| isert_get_sup_prot_ops(struct iscsi_conn *conn) |
| { |
| struct isert_conn *isert_conn = conn->context; |
| struct isert_device *device = isert_conn->device; |
| |
| if (conn->tpg->tpg_attrib.t10_pi) { |
| if (device->pi_capable) { |
| isert_info("conn %p PI offload enabled\n", isert_conn); |
| isert_conn->pi_support = true; |
| return TARGET_PROT_ALL; |
| } |
| } |
| |
| isert_info("conn %p PI offload disabled\n", isert_conn); |
| isert_conn->pi_support = false; |
| |
| return TARGET_PROT_NORMAL; |
| } |
| |
| 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 = 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); |
| |
| isert_dbg("conn %p Posting NOPIN Response\n", isert_conn); |
| |
| 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 = 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); |
| |
| isert_dbg("conn %p Posting Logout Response\n", isert_conn); |
| |
| 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 = 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); |
| |
| isert_dbg("conn %p Posting Task Management Response\n", isert_conn); |
| |
| 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 = conn->context; |
| struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; |
| struct isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_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); |
| if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) |
| return -ENOMEM; |
| 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 = device->pd->local_dma_lkey; |
| isert_cmd->tx_desc.num_sge = 2; |
| |
| isert_init_send_wr(isert_conn, isert_cmd, send_wr); |
| |
| isert_dbg("conn %p Posting Reject\n", isert_conn); |
| |
| 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 = 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, ISCSI_INFINIBAND); |
| if (rc < 0) |
| return rc; |
| |
| txt_rsp_len = rc; |
| isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); |
| |
| if (txt_rsp_len) { |
| struct isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_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); |
| if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) |
| return -ENOMEM; |
| |
| 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 = device->pd->local_dma_lkey; |
| isert_cmd->tx_desc.num_sge = 2; |
| } |
| isert_init_send_wr(isert_conn, isert_cmd, send_wr); |
| |
| isert_dbg("conn %p Text Response\n", isert_conn); |
| |
| return isert_post_response(isert_conn, isert_cmd); |
| } |
| |
| static inline void |
| isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_domain *domain) |
| { |
| domain->sig_type = IB_SIG_TYPE_T10_DIF; |
| domain->sig.dif.bg_type = IB_T10DIF_CRC; |
| domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size; |
| domain->sig.dif.ref_tag = se_cmd->reftag_seed; |
| /* |
| * At the moment we hard code those, but if in the future |
| * the target core would like to use it, we will take it |
| * from se_cmd. |
| */ |
| domain->sig.dif.apptag_check_mask = 0xffff; |
| domain->sig.dif.app_escape = true; |
| domain->sig.dif.ref_escape = true; |
| if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT || |
| se_cmd->prot_type == TARGET_DIF_TYPE2_PROT) |
| domain->sig.dif.ref_remap = true; |
| }; |
| |
| static int |
| isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs) |
| { |
| memset(sig_attrs, 0, sizeof(*sig_attrs)); |
| |
| switch (se_cmd->prot_op) { |
| case TARGET_PROT_DIN_INSERT: |
| case TARGET_PROT_DOUT_STRIP: |
| sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; |
| isert_set_dif_domain(se_cmd, &sig_attrs->wire); |
| break; |
| case TARGET_PROT_DOUT_INSERT: |
| case TARGET_PROT_DIN_STRIP: |
| sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; |
| isert_set_dif_domain(se_cmd, &sig_attrs->mem); |
| break; |
| case TARGET_PROT_DIN_PASS: |
| case TARGET_PROT_DOUT_PASS: |
| isert_set_dif_domain(se_cmd, &sig_attrs->wire); |
| isert_set_dif_domain(se_cmd, &sig_attrs->mem); |
| break; |
| default: |
| isert_err("Unsupported PI operation %d\n", se_cmd->prot_op); |
| return -EINVAL; |
| } |
| |
| if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD) |
| sig_attrs->check_mask |= IB_SIG_CHECK_GUARD; |
| if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG) |
| sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG; |
| if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG) |
| sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG; |
| |
| return 0; |
| } |
| |
| static int |
| isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn, |
| struct ib_cqe *cqe, struct ib_send_wr *chain_wr) |
| { |
| struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd; |
| enum dma_data_direction dir = target_reverse_dma_direction(se_cmd); |
| u8 port_num = conn->cm_id->port_num; |
| u64 addr; |
| u32 rkey, offset; |
| int ret; |
| |
| if (cmd->ctx_init_done) |
| goto rdma_ctx_post; |
| |
| if (dir == DMA_FROM_DEVICE) { |
| addr = cmd->write_va; |
| rkey = cmd->write_stag; |
| offset = cmd->iscsi_cmd->write_data_done; |
| } else { |
| addr = cmd->read_va; |
| rkey = cmd->read_stag; |
| offset = 0; |
| } |
| |
| if (isert_prot_cmd(conn, se_cmd)) { |
| struct ib_sig_attrs sig_attrs; |
| |
| ret = isert_set_sig_attrs(se_cmd, &sig_attrs); |
| if (ret) |
| return ret; |
| |
| WARN_ON_ONCE(offset); |
| ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num, |
| se_cmd->t_data_sg, se_cmd->t_data_nents, |
| se_cmd->t_prot_sg, se_cmd->t_prot_nents, |
| &sig_attrs, addr, rkey, dir); |
| } else { |
| ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num, |
| se_cmd->t_data_sg, se_cmd->t_data_nents, |
| offset, addr, rkey, dir); |
| } |
| |
| if (ret < 0) { |
| isert_err("Cmd: %p failed to prepare RDMA res\n", cmd); |
| return ret; |
| } |
| |
| cmd->ctx_init_done = true; |
| |
| rdma_ctx_post: |
| ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr); |
| if (ret < 0) |
| isert_err("Cmd: %p failed to post RDMA res\n", cmd); |
| 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_conn *isert_conn = conn->context; |
| struct ib_cqe *cqe = NULL; |
| struct ib_send_wr *chain_wr = NULL; |
| int rc; |
| |
| isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n", |
| isert_cmd, se_cmd->data_length); |
| |
| if (isert_prot_cmd(isert_conn, se_cmd)) { |
| isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done; |
| cqe = &isert_cmd->tx_desc.tx_cqe; |
| } else { |
| /* |
| * 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); |
| |
| rc = isert_post_recv(isert_conn, isert_cmd->rx_desc); |
| if (rc) { |
| isert_err("ib_post_recv failed with %d\n", rc); |
| return rc; |
| } |
| |
| chain_wr = &isert_cmd->tx_desc.send_wr; |
| } |
| |
| rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr); |
| isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n", |
| isert_cmd, rc); |
| return rc; |
| } |
| |
| static int |
| isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) |
| { |
| struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); |
| int ret; |
| |
| isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", |
| isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done); |
| |
| isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done; |
| ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context, |
| &isert_cmd->tx_desc.tx_cqe, NULL); |
| |
| isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n", |
| isert_cmd, ret); |
| return ret; |
| } |
| |
| static int |
| isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) |
| { |
| struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); |
| int ret = 0; |
| |
| switch (state) { |
| case ISTATE_REMOVE: |
| spin_lock_bh(&conn->cmd_lock); |
| list_del_init(&cmd->i_conn_node); |
| spin_unlock_bh(&conn->cmd_lock); |
| isert_put_cmd(isert_cmd, true); |
| break; |
| case ISTATE_SEND_NOPIN_WANT_RESPONSE: |
| ret = isert_put_nopin(cmd, conn, false); |
| break; |
| default: |
| isert_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) |
| { |
| struct isert_conn *isert_conn = conn->context; |
| int ret; |
| |
| switch (state) { |
| case ISTATE_SEND_LOGOUTRSP: |
| ret = isert_put_logout_rsp(cmd, conn); |
| if (!ret) |
| isert_conn->logout_posted = true; |
| 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: |
| isert_err("Unknown response state: 0x%02x\n", state); |
| ret = -EINVAL; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| struct rdma_cm_id * |
| isert_setup_id(struct isert_np *isert_np) |
| { |
| struct iscsi_np *np = isert_np->np; |
| struct rdma_cm_id *id; |
| struct sockaddr *sa; |
| int ret; |
| |
| sa = (struct sockaddr *)&np->np_sockaddr; |
| isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa); |
| |
| id = rdma_create_id(&init_net, isert_cma_handler, isert_np, |
| RDMA_PS_TCP, IB_QPT_RC); |
| if (IS_ERR(id)) { |
| isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id)); |
| ret = PTR_ERR(id); |
| goto out; |
| } |
| isert_dbg("id %p context %p\n", id, id->context); |
| |
| ret = rdma_bind_addr(id, sa); |
| if (ret) { |
| isert_err("rdma_bind_addr() failed: %d\n", ret); |
| goto out_id; |
| } |
| |
| ret = rdma_listen(id, 0); |
| if (ret) { |
| isert_err("rdma_listen() failed: %d\n", ret); |
| goto out_id; |
| } |
| |
| return id; |
| out_id: |
| rdma_destroy_id(id); |
| out: |
| return ERR_PTR(ret); |
| } |
| |
| static int |
| isert_setup_np(struct iscsi_np *np, |
| struct sockaddr_storage *ksockaddr) |
| { |
| struct isert_np *isert_np; |
| struct rdma_cm_id *isert_lid; |
| int ret; |
| |
| isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL); |
| if (!isert_np) |
| return -ENOMEM; |
| |
| sema_init(&isert_np->sem, 0); |
| mutex_init(&isert_np->mutex); |
| INIT_LIST_HEAD(&isert_np->accepted); |
| INIT_LIST_HEAD(&isert_np->pending); |
| isert_np->np = np; |
| |
| /* |
| * Setup the np->np_sockaddr from the passed sockaddr setup |
| * in iscsi_target_configfs.c code.. |
| */ |
| memcpy(&np->np_sockaddr, ksockaddr, |
| sizeof(struct sockaddr_storage)); |
| |
| isert_lid = isert_setup_id(isert_np); |
| if (IS_ERR(isert_lid)) { |
| ret = PTR_ERR(isert_lid); |
| goto out; |
| } |
| |
| isert_np->cm_id = isert_lid; |
| np->np_context = isert_np; |
| |
| return 0; |
| |
| out: |
| kfree(isert_np); |
| |
| return ret; |
| } |
| |
| static int |
| isert_rdma_accept(struct isert_conn *isert_conn) |
| { |
| struct rdma_cm_id *cm_id = isert_conn->cm_id; |
| struct rdma_conn_param cp; |
| int ret; |
| struct iser_cm_hdr rsp_hdr; |
| |
| memset(&cp, 0, sizeof(struct rdma_conn_param)); |
| cp.initiator_depth = isert_conn->initiator_depth; |
| cp.retry_count = 7; |
| cp.rnr_retry_count = 7; |
| |
| memset(&rsp_hdr, 0, sizeof(rsp_hdr)); |
| rsp_hdr.flags = ISERT_ZBVA_NOT_USED; |
| if (!isert_conn->snd_w_inv) |
| rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED; |
| cp.private_data = (void *)&rsp_hdr; |
| cp.private_data_len = sizeof(rsp_hdr); |
| |
| ret = rdma_accept(cm_id, &cp); |
| if (ret) { |
| isert_err("rdma_accept() failed with: %d\n", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) |
| { |
| struct isert_conn *isert_conn = conn->context; |
| int ret; |
| |
| isert_info("before login_req comp conn: %p\n", isert_conn); |
| ret = wait_for_completion_interruptible(&isert_conn->login_req_comp); |
| if (ret) { |
| isert_err("isert_conn %p interrupted before got login req\n", |
| isert_conn); |
| return ret; |
| } |
| reinit_completion(&isert_conn->login_req_comp); |
| |
| /* |
| * 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; |
| |
| isert_rx_login_req(isert_conn); |
| |
| isert_info("before login_comp conn: %p\n", conn); |
| ret = wait_for_completion_interruptible(&isert_conn->login_comp); |
| if (ret) |
| return ret; |
| |
| isert_info("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->cm_id; |
| struct rdma_route *cm_route = &cm_id->route; |
| |
| conn->login_family = np->np_sockaddr.ss_family; |
| |
| conn->login_sockaddr = cm_route->addr.dst_addr; |
| conn->local_sockaddr = cm_route->addr.src_addr; |
| } |
| |
| static int |
| isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) |
| { |
| struct isert_np *isert_np = np->np_context; |
| struct isert_conn *isert_conn; |
| int ret; |
| |
| accept_wait: |
| ret = down_interruptible(&isert_np->sem); |
| if (ret) |
| 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); |
| isert_dbg("np_thread_state %d\n", |
| np->np_thread_state); |
| /** |
| * No point in stalling here when np_thread |
| * is in state RESET/SHUTDOWN/EXIT - bail |
| **/ |
| return -ENODEV; |
| } |
| spin_unlock_bh(&np->np_thread_lock); |
| |
| mutex_lock(&isert_np->mutex); |
| if (list_empty(&isert_np->pending)) { |
| mutex_unlock(&isert_np->mutex); |
| goto accept_wait; |
| } |
| isert_conn = list_first_entry(&isert_np->pending, |
| struct isert_conn, node); |
| list_del_init(&isert_conn->node); |
| mutex_unlock(&isert_np->mutex); |
| |
| conn->context = isert_conn; |
| isert_conn->conn = conn; |
| isert_conn->state = ISER_CONN_BOUND; |
| |
| isert_set_conn_info(np, conn, isert_conn); |
| |
| isert_dbg("Processing isert_conn: %p\n", isert_conn); |
| |
| return 0; |
| } |
| |
| static void |
| isert_free_np(struct iscsi_np *np) |
| { |
| struct isert_np *isert_np = np->np_context; |
| struct isert_conn *isert_conn, *n; |
| |
| if (isert_np->cm_id) |
| rdma_destroy_id(isert_np->cm_id); |
| |
| /* |
| * FIXME: At this point we don't have a good way to insure |
| * that at this point we don't have hanging connections that |
| * completed RDMA establishment but didn't start iscsi login |
| * process. So work-around this by cleaning up what ever piled |
| * up in accepted and pending lists. |
| */ |
| mutex_lock(&isert_np->mutex); |
| if (!list_empty(&isert_np->pending)) { |
| isert_info("Still have isert pending connections\n"); |
| list_for_each_entry_safe(isert_conn, n, |
| &isert_np->pending, |
| node) { |
| isert_info("cleaning isert_conn %p state (%d)\n", |
| isert_conn, isert_conn->state); |
| isert_connect_release(isert_conn); |
| } |
| } |
| |
| if (!list_empty(&isert_np->accepted)) { |
| isert_info("Still have isert accepted connections\n"); |
| list_for_each_entry_safe(isert_conn, n, |
| &isert_np->accepted, |
| node) { |
| isert_info("cleaning isert_conn %p state (%d)\n", |
| isert_conn, isert_conn->state); |
| isert_connect_release(isert_conn); |
| } |
| } |
| mutex_unlock(&isert_np->mutex); |
| |
| np->np_context = NULL; |
| kfree(isert_np); |
| } |
| |
| static void isert_release_work(struct work_struct *work) |
| { |
| struct isert_conn *isert_conn = container_of(work, |
| struct isert_conn, |
| release_work); |
| |
| isert_info("Starting release conn %p\n", isert_conn); |
| |
| mutex_lock(&isert_conn->mutex); |
| isert_conn->state = ISER_CONN_DOWN; |
| mutex_unlock(&isert_conn->mutex); |
| |
| isert_info("Destroying conn %p\n", isert_conn); |
| isert_put_conn(isert_conn); |
| } |
| |
| static void |
| isert_wait4logout(struct isert_conn *isert_conn) |
| { |
| struct iscsi_conn *conn = isert_conn->conn; |
| |
| isert_info("conn %p\n", isert_conn); |
| |
| if (isert_conn->logout_posted) { |
| isert_info("conn %p wait for conn_logout_comp\n", isert_conn); |
| wait_for_completion_timeout(&conn->conn_logout_comp, |
| SECONDS_FOR_LOGOUT_COMP * HZ); |
| } |
| } |
| |
| /** |
| * isert_put_unsol_pending_cmds() - Drop commands waiting for |
| * unsolicitate dataout |
| * @conn: iscsi connection |
| * |
| * We might still have commands that are waiting for unsolicited |
| * dataouts messages. We must put the extra reference on those |
| * before blocking on the target_wait_for_session_cmds |
| */ |
| static void |
| isert_put_unsol_pending_cmds(struct iscsi_conn *conn) |
| { |
| struct iscsi_cmd *cmd, *tmp; |
| static LIST_HEAD(drop_cmd_list); |
| |
| spin_lock_bh(&conn->cmd_lock); |
| list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) { |
| if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) && |
| (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) && |
| (cmd->write_data_done < cmd->se_cmd.data_length)) |
| list_move_tail(&cmd->i_conn_node, &drop_cmd_list); |
| } |
| spin_unlock_bh(&conn->cmd_lock); |
| |
| list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) { |
| list_del_init(&cmd->i_conn_node); |
| if (cmd->i_state != ISTATE_REMOVE) { |
| struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); |
| |
| isert_info("conn %p dropping cmd %p\n", conn, cmd); |
| isert_put_cmd(isert_cmd, true); |
| } |
| } |
| } |
| |
| static void isert_wait_conn(struct iscsi_conn *conn) |
| { |
| struct isert_conn *isert_conn = conn->context; |
| |
| isert_info("Starting conn %p\n", isert_conn); |
| |
| mutex_lock(&isert_conn->mutex); |
| isert_conn_terminate(isert_conn); |
| mutex_unlock(&isert_conn->mutex); |
| |
| ib_drain_qp(isert_conn->qp); |
| isert_put_unsol_pending_cmds(conn); |
| isert_wait4logout(isert_conn); |
| |
| queue_work(isert_release_wq, &isert_conn->release_work); |
| } |
| |
| static void isert_free_conn(struct iscsi_conn *conn) |
| { |
| struct isert_conn *isert_conn = conn->context; |
| |
| ib_drain_qp(isert_conn->qp); |
| isert_put_conn(isert_conn); |
| } |
| |
| static void isert_get_rx_pdu(struct iscsi_conn *conn) |
| { |
| struct completion comp; |
| |
| init_completion(&comp); |
| |
| wait_for_completion_interruptible(&comp); |
| } |
| |
| static struct iscsit_transport iser_target_transport = { |
| .name = "IB/iSER", |
| .transport_type = ISCSI_INFINIBAND, |
| .rdma_shutdown = true, |
| .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, |
| .iscsit_aborted_task = isert_aborted_task, |
| .iscsit_get_rx_pdu = isert_get_rx_pdu, |
| .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops, |
| }; |
| |
| static int __init isert_init(void) |
| { |
| int ret; |
| |
| isert_comp_wq = alloc_workqueue("isert_comp_wq", |
| WQ_UNBOUND | WQ_HIGHPRI, 0); |
| if (!isert_comp_wq) { |
| isert_err("Unable to allocate isert_comp_wq\n"); |
| return -ENOMEM; |
| } |
| |
| isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND, |
| WQ_UNBOUND_MAX_ACTIVE); |
| if (!isert_release_wq) { |
| isert_err("Unable to allocate isert_release_wq\n"); |
| ret = -ENOMEM; |
| goto destroy_comp_wq; |
| } |
| |
| iscsit_register_transport(&iser_target_transport); |
| isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n"); |
| |
| return 0; |
| |
| destroy_comp_wq: |
| destroy_workqueue(isert_comp_wq); |
| |
| return ret; |
| } |
| |
| static void __exit isert_exit(void) |
| { |
| flush_scheduled_work(); |
| destroy_workqueue(isert_release_wq); |
| destroy_workqueue(isert_comp_wq); |
| iscsit_unregister_transport(&iser_target_transport); |
| isert_info("iSER_TARGET[0] - Released iser_target_transport\n"); |
| } |
| |
| MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure"); |
| MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(isert_init); |
| module_exit(isert_exit); |