| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Christoph Hellwig | 6080 | 46.96% | 7 | 5.51% |
| Nicholas Bellinger | 3072 | 23.73% | 22 | 17.32% |
| Sagi Grimberg | 2148 | 16.59% | 59 | 46.46% |
| Vu Pham | 724 | 5.59% | 4 | 3.15% |
| Jenny Derzhavetz (Jenny Falkovich) | 555 | 4.29% | 11 | 8.66% |
| Raju Rangoju | 81 | 0.63% | 1 | 0.79% |
| Alex Estrin | 64 | 0.49% | 1 | 0.79% |
| Alexey Khoroshilov | 45 | 0.35% | 1 | 0.79% |
| Varun Prakash | 32 | 0.25% | 1 | 0.79% |
| Or Gerlitz | 32 | 0.25% | 1 | 0.79% |
| Max Gurtovoy | 27 | 0.21% | 2 | 1.57% |
| Steve Wise | 23 | 0.18% | 2 | 1.57% |
| Bharat Potnuri | 17 | 0.13% | 1 | 0.79% |
| Wei Yongjun | 17 | 0.13% | 2 | 1.57% |
| Bart Van Assche | 8 | 0.06% | 2 | 1.57% |
| Jason Gunthorpe | 7 | 0.05% | 2 | 1.57% |
| Andy Grover | 4 | 0.03% | 2 | 1.57% |
| Leon Romanovsky | 4 | 0.03% | 1 | 0.79% |
| Guy Shapiro | 3 | 0.02% | 1 | 0.79% |
| Kees Cook | 2 | 0.02% | 1 | 0.79% |
| Colin Ian King | 1 | 0.01% | 1 | 0.79% |
| Doug Ledford | 1 | 0.01% | 1 | 0.79% |
| Rasmus Villemoes | 1 | 0.01% | 1 | 0.79% |
| Total | 12948 | 127 |
/******************************************************************************* * This file contains iSCSI extentions for RDMA (iSER) Verbs * * (c) Copyright 2013 Datera, Inc. * * Nicholas A. Bellinger <nab@linux-iscsi.org> * * 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 <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_SIGNATURE_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_SIGNATURE_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_unsoliticed_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.sig->sig_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.sig->sig_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_attrs *sig_attrs, 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, &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, &sig_attrs->mem); break; case TARGET_PROT_DIN_PASS: case TARGET_PROT_DOUT_PASS: isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); isert_set_dif_domain(se_cmd, sig_attrs, &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); } } static void isert_wait4cmds(struct iscsi_conn *conn) { isert_info("iscsi_conn %p\n", conn); if (conn->sess) { target_sess_cmd_list_set_waiting(conn->sess->se_sess); target_wait_for_sess_cmds(conn->sess->se_sess); } } /** * 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_wait4cmds(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);
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