| /******************************************************************************* |
| * 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 "isert_proto.h" |
| #include "ib_isert.h" |
| |
| #define ISERT_MAX_CONN 8 |
| #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN) |
| #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN) |
| #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 void |
| isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn); |
| static int |
| isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, |
| struct isert_rdma_wr *wr); |
| static void |
| isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn); |
| static int |
| isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, |
| struct isert_rdma_wr *wr); |
| static int |
| isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd); |
| static int |
| isert_rdma_post_recvl(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 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 int |
| isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr) |
| { |
| int ret; |
| |
| ret = ib_query_device(ib_dev, devattr); |
| if (ret) { |
| isert_err("ib_query_device() failed: %d\n", ret); |
| return ret; |
| } |
| isert_dbg("devattr->max_sge: %d\n", devattr->max_sge); |
| isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd); |
| |
| return 0; |
| } |
| |
| 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; |
| attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1; |
| /* |
| * FIXME: Use devattr.max_sge - 2 for max_send_sge as |
| * work-around for RDMA_READs with ConnectX-2. |
| * |
| * Also, still make sure to have at least two SGEs for |
| * outgoing control PDU responses. |
| */ |
| attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2); |
| isert_conn->max_sge = attr.cap.max_send_sge; |
| |
| attr.cap.max_recv_sge = 1; |
| attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| attr.qp_type = IB_QPT_RC; |
| 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 void |
| isert_cq_event_callback(struct ib_event *e, void *context) |
| { |
| isert_dbg("event: %d\n", e->event); |
| } |
| |
| 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 = kzalloc(ISERT_QP_MAX_RECV_DTOS * |
| sizeof(struct iser_rx_desc), GFP_KERNEL); |
| if (!isert_conn->rx_descs) |
| goto fail; |
| |
| 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; |
| } |
| |
| 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; |
| fail: |
| 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_cq_work(struct work_struct *); |
| static void isert_cq_callback(struct ib_cq *, void *); |
| |
| 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) { |
| cancel_work_sync(&comp->work); |
| ib_destroy_cq(comp->cq); |
| } |
| } |
| kfree(device->comps); |
| } |
| |
| static int |
| isert_alloc_comps(struct isert_device *device, |
| struct ib_device_attr *attr) |
| { |
| 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 " |
| "Fast registration %d pi_capable %d\n", |
| device->comps_used, device->ib_device->name, |
| device->ib_device->num_comp_vectors, device->use_fastreg, |
| device->pi_capable); |
| |
| device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp), |
| GFP_KERNEL); |
| if (!device->comps) { |
| isert_err("Unable to allocate completion contexts\n"); |
| return -ENOMEM; |
| } |
| |
| max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe); |
| |
| for (i = 0; i < device->comps_used; i++) { |
| struct ib_cq_init_attr cq_attr = {}; |
| struct isert_comp *comp = &device->comps[i]; |
| |
| comp->device = device; |
| INIT_WORK(&comp->work, isert_cq_work); |
| cq_attr.cqe = max_cqe; |
| cq_attr.comp_vector = i; |
| comp->cq = ib_create_cq(device->ib_device, |
| isert_cq_callback, |
| isert_cq_event_callback, |
| (void *)comp, |
| &cq_attr); |
| if (IS_ERR(comp->cq)) { |
| isert_err("Unable to allocate cq\n"); |
| ret = PTR_ERR(comp->cq); |
| comp->cq = NULL; |
| goto out_cq; |
| } |
| |
| ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP); |
| if (ret) |
| 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_attr *dev_attr; |
| int ret; |
| |
| dev_attr = &device->dev_attr; |
| ret = isert_query_device(device->ib_device, dev_attr); |
| if (ret) |
| return ret; |
| |
| /* asign function handlers */ |
| if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS && |
| dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) { |
| device->use_fastreg = 1; |
| device->reg_rdma_mem = isert_reg_rdma; |
| device->unreg_rdma_mem = isert_unreg_rdma; |
| } else { |
| device->use_fastreg = 0; |
| device->reg_rdma_mem = isert_map_rdma; |
| device->unreg_rdma_mem = isert_unmap_cmd; |
| } |
| |
| ret = isert_alloc_comps(device, dev_attr); |
| if (ret) |
| return ret; |
| |
| device->pd = ib_alloc_pd(device->ib_device); |
| 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 = dev_attr->device_cap_flags & |
| IB_DEVICE_SIGNATURE_HANDOVER ? true : false; |
| |
| return 0; |
| |
| out_cq: |
| isert_free_comps(device); |
| 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_conn_free_fastreg_pool(struct isert_conn *isert_conn) |
| { |
| struct fast_reg_descriptor *fr_desc, *tmp; |
| int i = 0; |
| |
| if (list_empty(&isert_conn->fr_pool)) |
| return; |
| |
| isert_info("Freeing conn %p fastreg pool", isert_conn); |
| |
| list_for_each_entry_safe(fr_desc, tmp, |
| &isert_conn->fr_pool, list) { |
| list_del(&fr_desc->list); |
| ib_dereg_mr(fr_desc->data_mr); |
| if (fr_desc->pi_ctx) { |
| ib_dereg_mr(fr_desc->pi_ctx->prot_mr); |
| ib_dereg_mr(fr_desc->pi_ctx->sig_mr); |
| kfree(fr_desc->pi_ctx); |
| } |
| kfree(fr_desc); |
| ++i; |
| } |
| |
| if (i < isert_conn->fr_pool_size) |
| isert_warn("Pool still has %d regions registered\n", |
| isert_conn->fr_pool_size - i); |
| } |
| |
| static int |
| isert_create_pi_ctx(struct fast_reg_descriptor *desc, |
| struct ib_device *device, |
| struct ib_pd *pd) |
| { |
| struct pi_context *pi_ctx; |
| int ret; |
| |
| pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); |
| if (!pi_ctx) { |
| isert_err("Failed to allocate pi context\n"); |
| return -ENOMEM; |
| } |
| |
| pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, |
| ISCSI_ISER_SG_TABLESIZE); |
| if (IS_ERR(pi_ctx->prot_mr)) { |
| isert_err("Failed to allocate prot frmr err=%ld\n", |
| PTR_ERR(pi_ctx->prot_mr)); |
| ret = PTR_ERR(pi_ctx->prot_mr); |
| goto err_pi_ctx; |
| } |
| desc->ind |= ISERT_PROT_KEY_VALID; |
| |
| pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2); |
| if (IS_ERR(pi_ctx->sig_mr)) { |
| isert_err("Failed to allocate signature enabled mr err=%ld\n", |
| PTR_ERR(pi_ctx->sig_mr)); |
| ret = PTR_ERR(pi_ctx->sig_mr); |
| goto err_prot_mr; |
| } |
| |
| desc->pi_ctx = pi_ctx; |
| desc->ind |= ISERT_SIG_KEY_VALID; |
| desc->ind &= ~ISERT_PROTECTED; |
| |
| return 0; |
| |
| err_prot_mr: |
| ib_dereg_mr(pi_ctx->prot_mr); |
| err_pi_ctx: |
| kfree(pi_ctx); |
| |
| return ret; |
| } |
| |
| static int |
| isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd, |
| struct fast_reg_descriptor *fr_desc) |
| { |
| fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, |
| ISCSI_ISER_SG_TABLESIZE); |
| if (IS_ERR(fr_desc->data_mr)) { |
| isert_err("Failed to allocate data frmr err=%ld\n", |
| PTR_ERR(fr_desc->data_mr)); |
| return PTR_ERR(fr_desc->data_mr); |
| } |
| fr_desc->ind |= ISERT_DATA_KEY_VALID; |
| |
| isert_dbg("Created fr_desc %p\n", fr_desc); |
| |
| return 0; |
| } |
| |
| static int |
| isert_conn_create_fastreg_pool(struct isert_conn *isert_conn) |
| { |
| struct fast_reg_descriptor *fr_desc; |
| struct isert_device *device = isert_conn->device; |
| struct se_session *se_sess = isert_conn->conn->sess->se_sess; |
| struct se_node_acl *se_nacl = se_sess->se_node_acl; |
| int i, ret, tag_num; |
| /* |
| * Setup the number of FRMRs based upon the number of tags |
| * available to session in iscsi_target_locate_portal(). |
| */ |
| tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth); |
| tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; |
| |
| isert_conn->fr_pool_size = 0; |
| for (i = 0; i < tag_num; i++) { |
| fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL); |
| if (!fr_desc) { |
| isert_err("Failed to allocate fast_reg descriptor\n"); |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| ret = isert_create_fr_desc(device->ib_device, |
| device->pd, fr_desc); |
| if (ret) { |
| isert_err("Failed to create fastreg descriptor err=%d\n", |
| ret); |
| kfree(fr_desc); |
| goto err; |
| } |
| |
| list_add_tail(&fr_desc->list, &isert_conn->fr_pool); |
| isert_conn->fr_pool_size++; |
| } |
| |
| isert_dbg("Creating conn %p fastreg pool size=%d", |
| isert_conn, isert_conn->fr_pool_size); |
| |
| return 0; |
| |
| err: |
| isert_conn_free_fastreg_pool(isert_conn); |
| return ret; |
| } |
| |
| 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_completion(&isert_conn->wait); |
| kref_init(&isert_conn->kref); |
| mutex_init(&isert_conn->mutex); |
| spin_lock_init(&isert_conn->pool_lock); |
| INIT_LIST_HEAD(&isert_conn->fr_pool); |
| 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_LOGIN_SIZE, DMA_TO_DEVICE); |
| ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, |
| ISCSI_DEF_MAX_RECV_SEG_LEN, |
| DMA_FROM_DEVICE); |
| kfree(isert_conn->login_buf); |
| } |
| |
| static int |
| isert_alloc_login_buf(struct isert_conn *isert_conn, |
| struct ib_device *ib_dev) |
| { |
| int ret; |
| |
| isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + |
| ISER_RX_LOGIN_SIZE, GFP_KERNEL); |
| if (!isert_conn->login_buf) { |
| isert_err("Unable to allocate isert_conn->login_buf\n"); |
| return -ENOMEM; |
| } |
| |
| isert_conn->login_req_buf = isert_conn->login_buf; |
| isert_conn->login_rsp_buf = isert_conn->login_buf + |
| ISCSI_DEF_MAX_RECV_SEG_LEN; |
| |
| isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n", |
| isert_conn->login_buf, isert_conn->login_req_buf, |
| isert_conn->login_rsp_buf); |
| |
| isert_conn->login_req_dma = ib_dma_map_single(ib_dev, |
| (void *)isert_conn->login_req_buf, |
| ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); |
| |
| ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma); |
| if (ret) { |
| isert_err("login_req_dma mapping error: %d\n", ret); |
| isert_conn->login_req_dma = 0; |
| goto out_login_buf; |
| } |
| |
| isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, |
| (void *)isert_conn->login_rsp_buf, |
| ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); |
| |
| ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); |
| if (ret) { |
| isert_err("login_rsp_dma mapping error: %d\n", ret); |
| isert_conn->login_rsp_dma = 0; |
| goto out_req_dma_map; |
| } |
| |
| return 0; |
| |
| out_req_dma_map: |
| ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, |
| ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); |
| out_login_buf: |
| kfree(isert_conn->login_buf); |
| return ret; |
| } |
| |
| 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; |
| |
| /* Set max inflight RDMA READ requests */ |
| isert_conn->initiator_depth = min_t(u8, |
| event->param.conn.initiator_depth, |
| device->dev_attr.max_qp_init_rd_atom); |
| isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth); |
| |
| ret = isert_conn_setup_qp(isert_conn, cma_id); |
| if (ret) |
| goto out_conn_dev; |
| |
| ret = isert_rdma_post_recvl(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); |
| |
| if (device->use_fastreg) |
| isert_conn_free_fastreg_pool(isert_conn); |
| |
| isert_free_rx_descriptors(isert_conn); |
| if (isert_conn->cm_id) |
| 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_buf) |
| isert_free_login_buf(isert_conn); |
| |
| isert_device_put(device); |
| |
| 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); |
| } |
| |
| /** |
| * isert_conn_terminate() - Initiate connection termination |
| * @isert_conn: isert connection struct |
| * |
| * Notes: |
| * In case the connection state is FULL_FEATURE, 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; |
| |
| switch (isert_conn->state) { |
| case ISER_CONN_TERMINATING: |
| break; |
| case ISER_CONN_UP: |
| case ISER_CONN_FULL_FEATURE: /* FALLTHRU */ |
| 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); |
| break; |
| default: |
| isert_warn("conn %p teminating in state %d\n", |
| isert_conn, isert_conn->state); |
| } |
| } |
| |
| 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_np *isert_np = cma_id->context; |
| struct isert_conn *isert_conn; |
| bool terminating = false; |
| |
| if (isert_np->cm_id == cma_id) |
| return isert_np_cma_handler(cma_id->context, event); |
| |
| isert_conn = cma_id->qp->qp_context; |
| |
| mutex_lock(&isert_conn->mutex); |
| terminating = (isert_conn->state == ISER_CONN_TERMINATING); |
| isert_conn_terminate(isert_conn); |
| mutex_unlock(&isert_conn->mutex); |
| |
| isert_info("conn %p completing wait\n", isert_conn); |
| complete(&isert_conn->wait); |
| |
| if (terminating) |
| goto out; |
| |
| mutex_lock(&isert_np->mutex); |
| if (!list_empty(&isert_conn->node)) { |
| 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); |
| |
| out: |
| return 0; |
| } |
| |
| static int |
| isert_connect_error(struct rdma_cm_id *cma_id) |
| { |
| struct isert_conn *isert_conn = cma_id->qp->qp_context; |
| |
| 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) |
| { |
| 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); |
| |
| 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_DEVICE_REMOVAL: /* FALLTHRU */ |
| case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */ |
| ret = isert_disconnected_handler(cma_id, event->event); |
| break; |
| case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */ |
| case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */ |
| 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, *rx_wr_failed; |
| 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_id = (uintptr_t)rx_desc; |
| rx_wr->sg_list = &rx_desc->rx_sg; |
| rx_wr->num_sge = 1; |
| rx_wr->next = rx_wr + 1; |
| } |
| rx_wr--; |
| rx_wr->next = NULL; /* mark end of work requests list */ |
| |
| isert_conn->post_recv_buf_count += count; |
| ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, |
| &rx_wr_failed); |
| if (ret) { |
| isert_err("ib_post_recv() failed with ret: %d\n", ret); |
| isert_conn->post_recv_buf_count -= count; |
| } |
| |
| return ret; |
| } |
| |
| static int |
| isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc) |
| { |
| struct ib_recv_wr *rx_wr_failed, rx_wr; |
| int ret; |
| |
| rx_wr.wr_id = (uintptr_t)rx_desc; |
| rx_wr.sg_list = &rx_desc->rx_sg; |
| rx_wr.num_sge = 1; |
| rx_wr.next = NULL; |
| |
| isert_conn->post_recv_buf_count++; |
| ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed); |
| if (ret) { |
| isert_err("ib_post_recv() failed with ret: %d\n", ret); |
| isert_conn->post_recv_buf_count--; |
| } |
| |
| return ret; |
| } |
| |
| static int |
| isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) |
| { |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| struct ib_send_wr send_wr, *send_wr_failed; |
| int ret; |
| |
| ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, |
| ISER_HEADERS_LEN, DMA_TO_DEVICE); |
| |
| send_wr.next = NULL; |
| send_wr.wr_id = (uintptr_t)tx_desc; |
| send_wr.sg_list = tx_desc->tx_sg; |
| send_wr.num_sge = tx_desc->num_sge; |
| send_wr.opcode = IB_WR_SEND; |
| send_wr.send_flags = IB_SEND_SIGNALED; |
| |
| ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed); |
| if (ret) |
| isert_err("ib_post_send() failed, ret: %d\n", ret); |
| |
| return ret; |
| } |
| |
| static void |
| isert_create_send_desc(struct isert_conn *isert_conn, |
| struct isert_cmd *isert_cmd, |
| struct iser_tx_desc *tx_desc) |
| { |
| struct 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); |
| |
| memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); |
| tx_desc->iser_header.flags = ISER_VER; |
| |
| tx_desc->num_sge = 1; |
| tx_desc->isert_cmd = isert_cmd; |
| |
| if (tx_desc->tx_sg[0].lkey != 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 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; |
| |
| isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND; |
| send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; |
| send_wr->opcode = IB_WR_SEND; |
| send_wr->sg_list = &tx_desc->tx_sg[0]; |
| send_wr->num_sge = isert_cmd->tx_desc.num_sge; |
| send_wr->send_flags = IB_SEND_SIGNALED; |
| } |
| |
| static int |
| isert_rdma_post_recvl(struct isert_conn *isert_conn) |
| { |
| struct ib_recv_wr rx_wr, *rx_wr_fail; |
| struct ib_sge sge; |
| int ret; |
| |
| memset(&sge, 0, sizeof(struct ib_sge)); |
| sge.addr = isert_conn->login_req_dma; |
| sge.length = ISER_RX_LOGIN_SIZE; |
| sge.lkey = isert_conn->device->pd->local_dma_lkey; |
| |
| isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n", |
| sge.addr, sge.length, sge.lkey); |
| |
| memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); |
| rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf; |
| rx_wr.sg_list = &sge; |
| rx_wr.num_sge = 1; |
| |
| isert_conn->post_recv_buf_count++; |
| ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail); |
| if (ret) { |
| isert_err("ib_post_recv() failed: %d\n", ret); |
| isert_conn->post_recv_buf_count--; |
| } |
| |
| 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(isert_conn, NULL, tx_desc); |
| |
| memcpy(&tx_desc->iscsi_header, &login->rsp[0], |
| sizeof(struct iscsi_hdr)); |
| |
| isert_init_tx_hdrs(isert_conn, tx_desc); |
| |
| if (length > 0) { |
| struct ib_sge *tx_dsg = &tx_desc->tx_sg[1]; |
| |
| ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma, |
| length, DMA_TO_DEVICE); |
| |
| memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length); |
| |
| ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma, |
| length, DMA_TO_DEVICE); |
| |
| tx_dsg->addr = isert_conn->login_rsp_dma; |
| tx_dsg->length = length; |
| tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey; |
| tx_desc->num_sge = 2; |
| } |
| if (!login->login_failed) { |
| if (login->login_complete) { |
| if (!conn->sess->sess_ops->SessionType && |
| isert_conn->device->use_fastreg) { |
| ret = isert_conn_create_fastreg_pool(isert_conn); |
| if (ret) { |
| isert_err("Conn: %p failed to create" |
| " fastreg pool\n", isert_conn); |
| return ret; |
| } |
| } |
| |
| ret = isert_alloc_rx_descriptors(isert_conn); |
| if (ret) |
| return ret; |
| |
| ret = isert_post_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_rdma_post_recvl(isert_conn); |
| if (ret) |
| return ret; |
| } |
| post_send: |
| ret = isert_post_send(isert_conn, tx_desc); |
| if (ret) |
| return ret; |
| |
| return 0; |
| } |
| |
| static void |
| isert_rx_login_req(struct isert_conn *isert_conn) |
| { |
| struct iser_rx_desc *rx_desc = (void *)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) { |
| isert_err("Unable to allocate text_in of payload_length: %u\n", |
| payload_length); |
| return -ENOMEM; |
| } |
| } |
| cmd->text_in_ptr = text_in; |
| |
| memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length); |
| |
| return iscsit_process_text_cmd(conn, cmd, hdr); |
| } |
| |
| static int |
| isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc, |
| uint32_t read_stag, uint64_t read_va, |
| uint32_t write_stag, uint64_t write_va) |
| { |
| struct iscsi_hdr *hdr = &rx_desc->iscsi_header; |
| struct iscsi_conn *conn = isert_conn->conn; |
| struct iscsi_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; |
| |
| 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_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn) |
| { |
| struct iser_hdr *iser_hdr = &rx_desc->iser_header; |
| uint64_t read_va = 0, write_va = 0; |
| uint32_t read_stag = 0, write_stag = 0; |
| |
| switch (iser_hdr->flags & 0xF0) { |
| case ISCSI_CTRL: |
| if (iser_hdr->flags & ISER_RSV) { |
| read_stag = be32_to_cpu(iser_hdr->read_stag); |
| read_va = be64_to_cpu(iser_hdr->read_va); |
| isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n", |
| read_stag, (unsigned long long)read_va); |
| } |
| if (iser_hdr->flags & ISER_WSV) { |
| write_stag = be32_to_cpu(iser_hdr->write_stag); |
| write_va = be64_to_cpu(iser_hdr->write_va); |
| 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_hdr->flags); |
| break; |
| } |
| |
| isert_rx_opcode(isert_conn, rx_desc, |
| read_stag, read_va, write_stag, write_va); |
| } |
| |
| static void |
| isert_rcv_completion(struct iser_rx_desc *desc, |
| struct isert_conn *isert_conn, |
| u32 xfer_len) |
| { |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| struct iscsi_hdr *hdr; |
| u64 rx_dma; |
| int rx_buflen; |
| |
| if ((char *)desc == isert_conn->login_req_buf) { |
| rx_dma = isert_conn->login_req_dma; |
| rx_buflen = ISER_RX_LOGIN_SIZE; |
| isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", |
| rx_dma, rx_buflen); |
| } else { |
| rx_dma = desc->dma_addr; |
| rx_buflen = ISER_RX_PAYLOAD_SIZE; |
| isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", |
| rx_dma, rx_buflen); |
| } |
| |
| ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE); |
| |
| hdr = &desc->iscsi_header; |
| isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", |
| hdr->opcode, hdr->itt, hdr->flags, |
| (int)(xfer_len - ISER_HEADERS_LEN)); |
| |
| if ((char *)desc == isert_conn->login_req_buf) { |
| isert_conn->login_req_len = xfer_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); |
| } else { |
| isert_rx_do_work(desc, isert_conn); |
| } |
| |
| ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen, |
| DMA_FROM_DEVICE); |
| |
| isert_conn->post_recv_buf_count--; |
| } |
| |
| static int |
| isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, |
| struct scatterlist *sg, u32 nents, u32 length, u32 offset, |
| enum iser_ib_op_code op, struct isert_data_buf *data) |
| { |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| |
| data->dma_dir = op == ISER_IB_RDMA_WRITE ? |
| DMA_TO_DEVICE : DMA_FROM_DEVICE; |
| |
| data->len = length - offset; |
| data->offset = offset; |
| data->sg_off = data->offset / PAGE_SIZE; |
| |
| data->sg = &sg[data->sg_off]; |
| data->nents = min_t(unsigned int, nents - data->sg_off, |
| ISCSI_ISER_SG_TABLESIZE); |
| data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE * |
| PAGE_SIZE); |
| |
| data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents, |
| data->dma_dir); |
| if (unlikely(!data->dma_nents)) { |
| isert_err("Cmd: unable to dma map SGs %p\n", sg); |
| return -EINVAL; |
| } |
| |
| isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n", |
| isert_cmd, data->dma_nents, data->sg, data->nents, data->len); |
| |
| return 0; |
| } |
| |
| static void |
| isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data) |
| { |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| |
| ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir); |
| memset(data, 0, sizeof(*data)); |
| } |
| |
| |
| |
| static void |
| isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) |
| { |
| struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; |
| |
| isert_dbg("Cmd %p\n", isert_cmd); |
| |
| if (wr->data.sg) { |
| isert_dbg("Cmd %p unmap_sg op\n", isert_cmd); |
| isert_unmap_data_buf(isert_conn, &wr->data); |
| } |
| |
| if (wr->rdma_wr) { |
| isert_dbg("Cmd %p free send_wr\n", isert_cmd); |
| kfree(wr->rdma_wr); |
| wr->rdma_wr = NULL; |
| } |
| |
| if (wr->ib_sge) { |
| isert_dbg("Cmd %p free ib_sge\n", isert_cmd); |
| kfree(wr->ib_sge); |
| wr->ib_sge = NULL; |
| } |
| } |
| |
| static void |
| isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) |
| { |
| struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; |
| |
| isert_dbg("Cmd %p\n", isert_cmd); |
| |
| if (wr->fr_desc) { |
| isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc); |
| if (wr->fr_desc->ind & ISERT_PROTECTED) { |
| isert_unmap_data_buf(isert_conn, &wr->prot); |
| wr->fr_desc->ind &= ~ISERT_PROTECTED; |
| } |
| spin_lock_bh(&isert_conn->pool_lock); |
| list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool); |
| spin_unlock_bh(&isert_conn->pool_lock); |
| wr->fr_desc = NULL; |
| } |
| |
| if (wr->data.sg) { |
| isert_dbg("Cmd %p unmap_sg op\n", isert_cmd); |
| isert_unmap_data_buf(isert_conn, &wr->data); |
| } |
| |
| wr->ib_sge = NULL; |
| wr->rdma_wr = NULL; |
| } |
| |
| static void |
| isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err) |
| { |
| struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; |
| struct isert_conn *isert_conn = isert_cmd->conn; |
| struct iscsi_conn *conn = isert_conn->conn; |
| struct isert_device *device = isert_conn->device; |
| 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); |
| } |
| } |
| |
| device->unreg_rdma_mem(isert_cmd, isert_conn); |
| transport_generic_free_cmd(&cmd->se_cmd, 0); |
| break; |
| case ISCSI_OP_SCSI_TMFUNC: |
| spin_lock_bh(&conn->cmd_lock); |
| if (!list_empty(&cmd->i_conn_node)) |
| list_del_init(&cmd->i_conn_node); |
| spin_unlock_bh(&conn->cmd_lock); |
| |
| transport_generic_free_cmd(&cmd->se_cmd, 0); |
| break; |
| case ISCSI_OP_REJECT: |
| case ISCSI_OP_NOOP_OUT: |
| case ISCSI_OP_TEXT: |
| 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_completion_rdma_write(struct iser_tx_desc *tx_desc, |
| struct isert_cmd *isert_cmd) |
| { |
| struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; |
| struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| struct isert_conn *isert_conn = isert_cmd->conn; |
| struct isert_device *device = isert_conn->device; |
| int ret = 0; |
| |
| if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) { |
| ret = isert_check_pi_status(se_cmd, |
| wr->fr_desc->pi_ctx->sig_mr); |
| wr->fr_desc->ind &= ~ISERT_PROTECTED; |
| } |
| |
| device->unreg_rdma_mem(isert_cmd, isert_conn); |
| wr->rdma_wr_num = 0; |
| if (ret) |
| transport_send_check_condition_and_sense(se_cmd, |
| se_cmd->pi_err, 0); |
| else |
| isert_put_response(isert_conn->conn, cmd); |
| } |
| |
| static void |
| isert_completion_rdma_read(struct iser_tx_desc *tx_desc, |
| struct isert_cmd *isert_cmd) |
| { |
| struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; |
| struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| struct isert_conn *isert_conn = isert_cmd->conn; |
| struct isert_device *device = isert_conn->device; |
| int ret = 0; |
| |
| if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) { |
| ret = isert_check_pi_status(se_cmd, |
| wr->fr_desc->pi_ctx->sig_mr); |
| wr->fr_desc->ind &= ~ISERT_PROTECTED; |
| } |
| |
| iscsit_stop_dataout_timer(cmd); |
| device->unreg_rdma_mem(isert_cmd, isert_conn); |
| cmd->write_data_done = wr->data.len; |
| wr->rdma_wr_num = 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); |
| |
| if (ret) { |
| target_put_sess_cmd(se_cmd); |
| transport_send_check_condition_and_sense(se_cmd, |
| se_cmd->pi_err, 0); |
| } 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); |
| case ISTATE_SEND_REJECT: /* FALLTHRU */ |
| case ISTATE_SEND_TEXTRSP: /* FALLTHRU */ |
| 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_response_completion(struct iser_tx_desc *tx_desc, |
| struct isert_cmd *isert_cmd, |
| struct isert_conn *isert_conn, |
| struct ib_device *ib_dev) |
| { |
| struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; |
| |
| if (cmd->i_state == ISTATE_SEND_TASKMGTRSP || |
| cmd->i_state == ISTATE_SEND_LOGOUTRSP || |
| cmd->i_state == ISTATE_SEND_REJECT || |
| cmd->i_state == ISTATE_SEND_TEXTRSP) { |
| isert_unmap_tx_desc(tx_desc, ib_dev); |
| |
| INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp); |
| queue_work(isert_comp_wq, &isert_cmd->comp_work); |
| return; |
| } |
| |
| cmd->i_state = ISTATE_SENT_STATUS; |
| isert_completion_put(tx_desc, isert_cmd, ib_dev, false); |
| } |
| |
| static void |
| isert_snd_completion(struct iser_tx_desc *tx_desc, |
| struct isert_conn *isert_conn) |
| { |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| struct isert_cmd *isert_cmd = tx_desc->isert_cmd; |
| struct isert_rdma_wr *wr; |
| |
| if (!isert_cmd) { |
| isert_unmap_tx_desc(tx_desc, ib_dev); |
| return; |
| } |
| wr = &isert_cmd->rdma_wr; |
| |
| isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op); |
| |
| switch (wr->iser_ib_op) { |
| case ISER_IB_SEND: |
| isert_response_completion(tx_desc, isert_cmd, |
| isert_conn, ib_dev); |
| break; |
| case ISER_IB_RDMA_WRITE: |
| isert_completion_rdma_write(tx_desc, isert_cmd); |
| break; |
| case ISER_IB_RDMA_READ: |
| isert_completion_rdma_read(tx_desc, isert_cmd); |
| break; |
| default: |
| isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op); |
| dump_stack(); |
| break; |
| } |
| } |
| |
| /** |
| * is_isert_tx_desc() - Indicate if the completion wr_id |
| * is a TX descriptor or not. |
| * @isert_conn: iser connection |
| * @wr_id: completion WR identifier |
| * |
| * Since we cannot rely on wc opcode in FLUSH errors |
| * we must work around it by checking if the wr_id address |
| * falls in the iser connection rx_descs buffer. If so |
| * it is an RX descriptor, otherwize it is a TX. |
| */ |
| static inline bool |
| is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id) |
| { |
| void *start = isert_conn->rx_descs; |
| int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs); |
| |
| if (wr_id >= start && wr_id < start + len) |
| return false; |
| |
| return true; |
| } |
| |
| static void |
| isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc) |
| { |
| if (wc->wr_id == ISER_BEACON_WRID) { |
| isert_info("conn %p completing wait_comp_err\n", |
| isert_conn); |
| complete(&isert_conn->wait_comp_err); |
| } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) { |
| struct ib_device *ib_dev = isert_conn->cm_id->device; |
| struct isert_cmd *isert_cmd; |
| struct iser_tx_desc *desc; |
| |
| desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; |
| isert_cmd = desc->isert_cmd; |
| if (!isert_cmd) |
| isert_unmap_tx_desc(desc, ib_dev); |
| else |
| isert_completion_put(desc, isert_cmd, ib_dev, true); |
| } else { |
| isert_conn->post_recv_buf_count--; |
| if (!isert_conn->post_recv_buf_count) |
| iscsit_cause_connection_reinstatement(isert_conn->conn, 0); |
| } |
| } |
| |
| static void |
| isert_handle_wc(struct ib_wc *wc) |
| { |
| struct isert_conn *isert_conn; |
| struct iser_tx_desc *tx_desc; |
| struct iser_rx_desc *rx_desc; |
| |
| isert_conn = wc->qp->qp_context; |
| if (likely(wc->status == IB_WC_SUCCESS)) { |
| if (wc->opcode == IB_WC_RECV) { |
| rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id; |
| isert_rcv_completion(rx_desc, isert_conn, wc->byte_len); |
| } else { |
| tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; |
| isert_snd_completion(tx_desc, isert_conn); |
| } |
| } else { |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| isert_err("%s (%d): wr id %llx vend_err %x\n", |
| ib_wc_status_msg(wc->status), wc->status, |
| wc->wr_id, wc->vendor_err); |
| else |
| isert_dbg("%s (%d): wr id %llx\n", |
| ib_wc_status_msg(wc->status), wc->status, |
| wc->wr_id); |
| |
| if (wc->wr_id != ISER_FASTREG_LI_WRID) |
| isert_cq_comp_err(isert_conn, wc); |
| } |
| } |
| |
| static void |
| isert_cq_work(struct work_struct *work) |
| { |
| enum { isert_poll_budget = 65536 }; |
| struct isert_comp *comp = container_of(work, struct isert_comp, |
| work); |
| struct ib_wc *const wcs = comp->wcs; |
| int i, n, completed = 0; |
| |
| while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) { |
| for (i = 0; i < n; i++) |
| isert_handle_wc(&wcs[i]); |
| |
| completed += n; |
| if (completed >= isert_poll_budget) |
| break; |
| } |
| |
| ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP); |
| } |
| |
| static void |
| isert_cq_callback(struct ib_cq *cq, void *context) |
| { |
| struct isert_comp *comp = context; |
| |
| queue_work(isert_comp_wq, &comp->work); |
| } |
| |
| static int |
| isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) |
| { |
| struct ib_send_wr *wr_failed; |
| 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, |
| &wr_failed); |
| 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); |
| |
| 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; |
| struct isert_device *device = isert_conn->device; |
| |
| 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); |
| |
| device->unreg_rdma_mem(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); |
| 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); |
| |
| 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 int |
| isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, |
| struct ib_sge *ib_sge, struct ib_rdma_wr *rdma_wr, |
| u32 data_left, u32 offset) |
| { |
| struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; |
| struct scatterlist *sg_start, *tmp_sg; |
| struct isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_device; |
| u32 sg_off, page_off; |
| int i = 0, sg_nents; |
| |
| sg_off = offset / PAGE_SIZE; |
| sg_start = &cmd->se_cmd.t_data_sg[sg_off]; |
| sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge); |
| page_off = offset % PAGE_SIZE; |
| |
| rdma_wr->wr.sg_list = ib_sge; |
| rdma_wr->wr.wr_id = (uintptr_t)&isert_cmd->tx_desc; |
| /* |
| * Perform mapping of TCM scatterlist memory ib_sge dma_addr. |
| */ |
| for_each_sg(sg_start, tmp_sg, sg_nents, i) { |
| isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, " |
| "page_off: %u\n", |
| (unsigned long long)tmp_sg->dma_address, |
| tmp_sg->length, page_off); |
| |
| ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off; |
| ib_sge->length = min_t(u32, data_left, |
| ib_sg_dma_len(ib_dev, tmp_sg) - page_off); |
| ib_sge->lkey = device->pd->local_dma_lkey; |
| |
| isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n", |
| ib_sge->addr, ib_sge->length, ib_sge->lkey); |
| page_off = 0; |
| data_left -= ib_sge->length; |
| if (!data_left) |
| break; |
| ib_sge++; |
| isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge); |
| } |
| |
| rdma_wr->wr.num_sge = ++i; |
| isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n", |
| rdma_wr->wr.sg_list, rdma_wr->wr.num_sge); |
| |
| return rdma_wr->wr.num_sge; |
| } |
| |
| static int |
| isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, |
| struct isert_rdma_wr *wr) |
| { |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); |
| struct isert_conn *isert_conn = conn->context; |
| struct isert_data_buf *data = &wr->data; |
| struct ib_rdma_wr *rdma_wr; |
| struct ib_sge *ib_sge; |
| u32 offset, data_len, data_left, rdma_write_max, va_offset = 0; |
| int ret = 0, i, ib_sge_cnt; |
| |
| isert_cmd->tx_desc.isert_cmd = isert_cmd; |
| |
| offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0; |
| ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg, |
| se_cmd->t_data_nents, se_cmd->data_length, |
| offset, wr->iser_ib_op, &wr->data); |
| if (ret) |
| return ret; |
| |
| data_left = data->len; |
| offset = data->offset; |
| |
| ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL); |
| if (!ib_sge) { |
| isert_warn("Unable to allocate ib_sge\n"); |
| ret = -ENOMEM; |
| goto unmap_cmd; |
| } |
| wr->ib_sge = ib_sge; |
| |
| wr->rdma_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge); |
| wr->rdma_wr = kzalloc(sizeof(struct ib_rdma_wr) * wr->rdma_wr_num, |
| GFP_KERNEL); |
| if (!wr->rdma_wr) { |
| isert_dbg("Unable to allocate wr->rdma_wr\n"); |
| ret = -ENOMEM; |
| goto unmap_cmd; |
| } |
| |
| wr->isert_cmd = isert_cmd; |
| rdma_write_max = isert_conn->max_sge * PAGE_SIZE; |
| |
| for (i = 0; i < wr->rdma_wr_num; i++) { |
| rdma_wr = &isert_cmd->rdma_wr.rdma_wr[i]; |
| data_len = min(data_left, rdma_write_max); |
| |
| rdma_wr->wr.send_flags = 0; |
| if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { |
| rdma_wr->wr.opcode = IB_WR_RDMA_WRITE; |
| rdma_wr->remote_addr = isert_cmd->read_va + offset; |
| rdma_wr->rkey = isert_cmd->read_stag; |
| if (i + 1 == wr->rdma_wr_num) |
| rdma_wr->wr.next = &isert_cmd->tx_desc.send_wr; |
| else |
| rdma_wr->wr.next = &wr->rdma_wr[i + 1].wr; |
| } else { |
| rdma_wr->wr.opcode = IB_WR_RDMA_READ; |
| rdma_wr->remote_addr = isert_cmd->write_va + va_offset; |
| rdma_wr->rkey = isert_cmd->write_stag; |
| if (i + 1 == wr->rdma_wr_num) |
| rdma_wr->wr.send_flags = IB_SEND_SIGNALED; |
| else |
| rdma_wr->wr.next = &wr->rdma_wr[i + 1].wr; |
| } |
| |
| ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge, |
| rdma_wr, data_len, offset); |
| ib_sge += ib_sge_cnt; |
| |
| offset += data_len; |
| va_offset += data_len; |
| data_left -= data_len; |
| } |
| |
| return 0; |
| unmap_cmd: |
| isert_unmap_data_buf(isert_conn, data); |
| |
| return ret; |
| } |
| |
| static inline void |
| isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr) |
| { |
| u32 rkey; |
| |
| memset(inv_wr, 0, sizeof(*inv_wr)); |
| inv_wr->wr_id = ISER_FASTREG_LI_WRID; |
| inv_wr->opcode = IB_WR_LOCAL_INV; |
| inv_wr->ex.invalidate_rkey = mr->rkey; |
| |
| /* Bump the key */ |
| rkey = ib_inc_rkey(mr->rkey); |
| ib_update_fast_reg_key(mr, rkey); |
| } |
| |
| static int |
| isert_fast_reg_mr(struct isert_conn *isert_conn, |
| struct fast_reg_descriptor *fr_desc, |
| struct isert_data_buf *mem, |
| enum isert_indicator ind, |
| struct ib_sge *sge) |
| { |
| struct isert_device *device = isert_conn->device; |
| struct ib_device *ib_dev = device->ib_device; |
| struct ib_mr *mr; |
| struct ib_reg_wr reg_wr; |
| struct ib_send_wr inv_wr, *bad_wr, *wr = NULL; |
| int ret, n; |
| |
| if (mem->dma_nents == 1) { |
| sge->lkey = device->pd->local_dma_lkey; |
| sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]); |
| sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]); |
| isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n", |
| sge->addr, sge->length, sge->lkey); |
| return 0; |
| } |
| |
| if (ind == ISERT_DATA_KEY_VALID) |
| /* Registering data buffer */ |
| mr = fr_desc->data_mr; |
| else |
| /* Registering protection buffer */ |
| mr = fr_desc->pi_ctx->prot_mr; |
| |
| if (!(fr_desc->ind & ind)) { |
| isert_inv_rkey(&inv_wr, mr); |
| wr = &inv_wr; |
| } |
| |
| n = ib_map_mr_sg(mr, mem->sg, mem->nents, PAGE_SIZE); |
| if (unlikely(n != mem->nents)) { |
| isert_err("failed to map mr sg (%d/%d)\n", |
| n, mem->nents); |
| return n < 0 ? n : -EINVAL; |
| } |
| |
| isert_dbg("Use fr_desc %p sg_nents %d offset %u\n", |
| fr_desc, mem->nents, mem->offset); |
| |
| reg_wr.wr.next = NULL; |
| reg_wr.wr.opcode = IB_WR_REG_MR; |
| reg_wr.wr.wr_id = ISER_FASTREG_LI_WRID; |
| reg_wr.wr.send_flags = 0; |
| reg_wr.wr.num_sge = 0; |
| reg_wr.mr = mr; |
| reg_wr.key = mr->lkey; |
| reg_wr.access = IB_ACCESS_LOCAL_WRITE; |
| |
| if (!wr) |
| wr = ®_wr.wr; |
| else |
| wr->next = ®_wr.wr; |
| |
| ret = ib_post_send(isert_conn->qp, wr, &bad_wr); |
| if (ret) { |
| isert_err("fast registration failed, ret:%d\n", ret); |
| return ret; |
| } |
| fr_desc->ind &= ~ind; |
| |
| sge->lkey = mr->lkey; |
| sge->addr = mr->iova; |
| sge->length = mr->length; |
| |
| isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n", |
| sge->addr, sge->length, sge->lkey); |
| |
| return ret; |
| } |
| |
| 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) |
| { |
| 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; |
| } |
| |
| return 0; |
| } |
| |
| static inline u8 |
| isert_set_prot_checks(u8 prot_checks) |
| { |
| return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) | |
| (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) | |
| (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0); |
| } |
| |
| static int |
| isert_reg_sig_mr(struct isert_conn *isert_conn, |
| struct se_cmd *se_cmd, |
| struct isert_rdma_wr *rdma_wr, |
| struct fast_reg_descriptor *fr_desc) |
| { |
| struct ib_sig_handover_wr sig_wr; |
| struct ib_send_wr inv_wr, *bad_wr, *wr = NULL; |
| struct pi_context *pi_ctx = fr_desc->pi_ctx; |
| struct ib_sig_attrs sig_attrs; |
| int ret; |
| |
| memset(&sig_attrs, 0, sizeof(sig_attrs)); |
| ret = isert_set_sig_attrs(se_cmd, &sig_attrs); |
| if (ret) |
| goto err; |
| |
| sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks); |
| |
| if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) { |
| isert_inv_rkey(&inv_wr, pi_ctx->sig_mr); |
| wr = &inv_wr; |
| } |
| |
| memset(&sig_wr, 0, sizeof(sig_wr)); |
| sig_wr.wr.opcode = IB_WR_REG_SIG_MR; |
| sig_wr.wr.wr_id = ISER_FASTREG_LI_WRID; |
| sig_wr.wr.sg_list = &rdma_wr->ib_sg[DATA]; |
| sig_wr.wr.num_sge = 1; |
| sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE; |
| sig_wr.sig_attrs = &sig_attrs; |
| sig_wr.sig_mr = pi_ctx->sig_mr; |
| if (se_cmd->t_prot_sg) |
| sig_wr.prot = &rdma_wr->ib_sg[PROT]; |
| |
| if (!wr) |
| wr = &sig_wr.wr; |
| else |
| wr->next = &sig_wr.wr; |
| |
| ret = ib_post_send(isert_conn->qp, wr, &bad_wr); |
| if (ret) { |
| isert_err("fast registration failed, ret:%d\n", ret); |
| goto err; |
| } |
| fr_desc->ind &= ~ISERT_SIG_KEY_VALID; |
| |
| rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey; |
| rdma_wr->ib_sg[SIG].addr = 0; |
| rdma_wr->ib_sg[SIG].length = se_cmd->data_length; |
| if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP && |
| se_cmd->prot_op != TARGET_PROT_DOUT_INSERT) |
| /* |
| * We have protection guards on the wire |
| * so we need to set a larget transfer |
| */ |
| rdma_wr->ib_sg[SIG].length += se_cmd->prot_length; |
| |
| isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n", |
| rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length, |
| rdma_wr->ib_sg[SIG].lkey); |
| err: |
| return ret; |
| } |
| |
| static int |
| isert_handle_prot_cmd(struct isert_conn *isert_conn, |
| struct isert_cmd *isert_cmd, |
| struct isert_rdma_wr *wr) |
| { |
| struct isert_device *device = isert_conn->device; |
| struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd; |
| int ret; |
| |
| if (!wr->fr_desc->pi_ctx) { |
| ret = isert_create_pi_ctx(wr->fr_desc, |
| device->ib_device, |
| device->pd); |
| if (ret) { |
| isert_err("conn %p failed to allocate pi_ctx\n", |
| isert_conn); |
| return ret; |
| } |
| } |
| |
| if (se_cmd->t_prot_sg) { |
| ret = isert_map_data_buf(isert_conn, isert_cmd, |
| se_cmd->t_prot_sg, |
| se_cmd->t_prot_nents, |
| se_cmd->prot_length, |
| 0, wr->iser_ib_op, &wr->prot); |
| if (ret) { |
| isert_err("conn %p failed to map protection buffer\n", |
| isert_conn); |
| return ret; |
| } |
| |
| memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT])); |
| ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot, |
| ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]); |
| if (ret) { |
| isert_err("conn %p failed to fast reg mr\n", |
| isert_conn); |
| goto unmap_prot_cmd; |
| } |
| } |
| |
| ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc); |
| if (ret) { |
| isert_err("conn %p failed to fast reg mr\n", |
| isert_conn); |
| goto unmap_prot_cmd; |
| } |
| wr->fr_desc->ind |= ISERT_PROTECTED; |
| |
| return 0; |
| |
| unmap_prot_cmd: |
| if (se_cmd->t_prot_sg) |
| isert_unmap_data_buf(isert_conn, &wr->prot); |
| |
| return ret; |
| } |
| |
| static int |
| isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, |
| struct isert_rdma_wr *wr) |
| { |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); |
| struct isert_conn *isert_conn = conn->context; |
| struct fast_reg_descriptor *fr_desc = NULL; |
| struct ib_rdma_wr *rdma_wr; |
| struct ib_sge *ib_sg; |
| u32 offset; |
| int ret = 0; |
| unsigned long flags; |
| |
| isert_cmd->tx_desc.isert_cmd = isert_cmd; |
| |
| offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0; |
| ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg, |
| se_cmd->t_data_nents, se_cmd->data_length, |
| offset, wr->iser_ib_op, &wr->data); |
| if (ret) |
| return ret; |
| |
| if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) { |
| spin_lock_irqsave(&isert_conn->pool_lock, flags); |
| fr_desc = list_first_entry(&isert_conn->fr_pool, |
| struct fast_reg_descriptor, list); |
| list_del(&fr_desc->list); |
| spin_unlock_irqrestore(&isert_conn->pool_lock, flags); |
| wr->fr_desc = fr_desc; |
| } |
| |
| ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data, |
| ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]); |
| if (ret) |
| goto unmap_cmd; |
| |
| if (isert_prot_cmd(isert_conn, se_cmd)) { |
| ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr); |
| if (ret) |
| goto unmap_cmd; |
| |
| ib_sg = &wr->ib_sg[SIG]; |
| } else { |
| ib_sg = &wr->ib_sg[DATA]; |
| } |
| |
| memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg)); |
| wr->ib_sge = &wr->s_ib_sge; |
| wr->rdma_wr_num = 1; |
| memset(&wr->s_rdma_wr, 0, sizeof(wr->s_rdma_wr)); |
| wr->rdma_wr = &wr->s_rdma_wr; |
| wr->isert_cmd = isert_cmd; |
| |
| rdma_wr = &isert_cmd->rdma_wr.s_rdma_wr; |
| rdma_wr->wr.sg_list = &wr->s_ib_sge; |
| rdma_wr->wr.num_sge = 1; |
| rdma_wr->wr.wr_id = (uintptr_t)&isert_cmd->tx_desc; |
| if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { |
| rdma_wr->wr.opcode = IB_WR_RDMA_WRITE; |
| rdma_wr->remote_addr = isert_cmd->read_va; |
| rdma_wr->rkey = isert_cmd->read_stag; |
| rdma_wr->wr.send_flags = !isert_prot_cmd(isert_conn, se_cmd) ? |
| 0 : IB_SEND_SIGNALED; |
| } else { |
| rdma_wr->wr.opcode = IB_WR_RDMA_READ; |
| rdma_wr->remote_addr = isert_cmd->write_va; |
| rdma_wr->rkey = isert_cmd->write_stag; |
| rdma_wr->wr.send_flags = IB_SEND_SIGNALED; |
| } |
| |
| return 0; |
| |
| unmap_cmd: |
| if (fr_desc) { |
| spin_lock_irqsave(&isert_conn->pool_lock, flags); |
| list_add_tail(&fr_desc->list, &isert_conn->fr_pool); |
| spin_unlock_irqrestore(&isert_conn->pool_lock, flags); |
| } |
| isert_unmap_data_buf(isert_conn, &wr->data); |
| |
| return ret; |
| } |
| |
| static int |
| isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) |
| { |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); |
| struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; |
| struct isert_conn *isert_conn = conn->context; |
| struct isert_device *device = isert_conn->device; |
| struct ib_send_wr *wr_failed; |
| int rc; |
| |
| isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n", |
| isert_cmd, se_cmd->data_length); |
| |
| wr->iser_ib_op = ISER_IB_RDMA_WRITE; |
| rc = device->reg_rdma_mem(conn, cmd, wr); |
| if (rc) { |
| isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); |
| return rc; |
| } |
| |
| if (!isert_prot_cmd(isert_conn, se_cmd)) { |
| /* |
| * 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); |
| isert_cmd->rdma_wr.s_rdma_wr.wr.next = &isert_cmd->tx_desc.send_wr; |
| wr->rdma_wr_num += 1; |
| |
| rc = isert_post_recv(isert_conn, isert_cmd->rx_desc); |
| if (rc) { |
| isert_err("ib_post_recv failed with %d\n", rc); |
| return rc; |
| } |
| } |
| |
| rc = ib_post_send(isert_conn->qp, &wr->rdma_wr->wr, &wr_failed); |
| if (rc) |
| isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n"); |
| |
| if (!isert_prot_cmd(isert_conn, se_cmd)) |
| isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data " |
| "READ\n", isert_cmd); |
| else |
| isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", |
| isert_cmd); |
| |
| return 1; |
| } |
| |
| static int |
| isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) |
| { |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); |
| struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; |
| struct isert_conn *isert_conn = conn->context; |
| struct isert_device *device = isert_conn->device; |
| struct ib_send_wr *wr_failed; |
| int rc; |
| |
| isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", |
| isert_cmd, se_cmd->data_length, cmd->write_data_done); |
| wr->iser_ib_op = ISER_IB_RDMA_READ; |
| rc = device->reg_rdma_mem(conn, cmd, wr); |
| if (rc) { |
| isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); |
| return rc; |
| } |
| |
| rc = ib_post_send(isert_conn->qp, &wr->rdma_wr->wr, &wr_failed); |
| if (rc) |
| isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n"); |
| |
| isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n", |
| isert_cmd); |
| |
| return 0; |
| } |
| |
| static int |
| isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) |
| { |
| 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) { |
| isert_err("Unable to allocate struct isert_np\n"); |
| 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; |
| |
| memset(&cp, 0, sizeof(struct rdma_conn_param)); |
| cp.initiator_depth = isert_conn->initiator_depth; |
| cp.retry_count = 7; |
| cp.rnr_retry_count = 7; |
| |
| 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_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); |
| |
| wait_for_completion(&isert_conn->wait); |
| |
| 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); |
| } |
| } |
| |
| static void |
| isert_wait4flush(struct isert_conn *isert_conn) |
| { |
| struct ib_recv_wr *bad_wr; |
| |
| isert_info("conn %p\n", isert_conn); |
| |
| init_completion(&isert_conn->wait_comp_err); |
| isert_conn->beacon.wr_id = ISER_BEACON_WRID; |
| /* post an indication that all flush errors were consumed */ |
| if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) { |
| isert_err("conn %p failed to post beacon", isert_conn); |
| return; |
| } |
| |
| wait_for_completion(&isert_conn->wait_comp_err); |
| } |
| |
| /** |
| * 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); |
| /* |
| * Only wait for wait_comp_err if the isert_conn made it |
| * into full feature phase.. |
| */ |
| if (isert_conn->state == ISER_CONN_INIT) { |
| mutex_unlock(&isert_conn->mutex); |
| return; |
| } |
| isert_conn_terminate(isert_conn); |
| mutex_unlock(&isert_conn->mutex); |
| |
| isert_wait4flush(isert_conn); |
| 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; |
| |
| isert_wait4flush(isert_conn); |
| isert_put_conn(isert_conn); |
| } |
| |
| static struct iscsit_transport iser_target_transport = { |
| .name = "IB/iSER", |
| .transport_type = ISCSI_INFINIBAND, |
| .priv_size = sizeof(struct isert_cmd), |
| .owner = THIS_MODULE, |
| .iscsit_setup_np = isert_setup_np, |
| .iscsit_accept_np = isert_accept_np, |
| .iscsit_free_np = isert_free_np, |
| .iscsit_wait_conn = isert_wait_conn, |
| .iscsit_free_conn = isert_free_conn, |
| .iscsit_get_login_rx = isert_get_login_rx, |
| .iscsit_put_login_tx = isert_put_login_tx, |
| .iscsit_immediate_queue = isert_immediate_queue, |
| .iscsit_response_queue = isert_response_queue, |
| .iscsit_get_dataout = isert_get_dataout, |
| .iscsit_queue_data_in = isert_put_datain, |
| .iscsit_queue_status = isert_put_response, |
| .iscsit_aborted_task = isert_aborted_task, |
| .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"); |
| ret = -ENOMEM; |
| 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_VERSION("1.0"); |
| MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(isert_init); |
| module_exit(isert_exit); |