diff options
Diffstat (limited to 'drivers/infiniband/ulp/isert/ib_isert.c')
| -rw-r--r-- | drivers/infiniband/ulp/isert/ib_isert.c | 2651 |
1 files changed, 2651 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c new file mode 100644 index 000000000..ed375f517 --- /dev/null +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -0,0 +1,2651 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/******************************************************************************* + * This file contains iSCSI extentions for RDMA (iSER) Verbs + * + * (c) Copyright 2013 Datera, Inc. + * + * Nicholas A. Bellinger <nab@linux-iscsi.org> + * + ****************************************************************************/ + +#include <linux/string.h> +#include <linux/module.h> +#include <linux/scatterlist.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <rdma/ib_verbs.h> +#include <rdma/ib_cm.h> +#include <rdma/rdma_cm.h> +#include <target/target_core_base.h> +#include <target/target_core_fabric.h> +#include <target/iscsi/iscsi_transport.h> +#include <linux/semaphore.h> + +#include "ib_isert.h" + +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 int isert_sg_tablesize_set(const char *val, + const struct kernel_param *kp); +static const struct kernel_param_ops sg_tablesize_ops = { + .set = isert_sg_tablesize_set, + .get = param_get_int, +}; + +static int isert_sg_tablesize = ISCSI_ISER_MIN_SG_TABLESIZE; +module_param_cb(sg_tablesize, &sg_tablesize_ops, &isert_sg_tablesize, 0644); +MODULE_PARM_DESC(sg_tablesize, + "Number of gather/scatter entries in a single scsi command, should >= 128 (default: 128, max: 4096)"); + +static DEFINE_MUTEX(device_list_mutex); +static LIST_HEAD(device_list); +static struct workqueue_struct *isert_comp_wq; +static struct workqueue_struct *isert_release_wq; + +static int +isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd); +static int +isert_login_post_recv(struct isert_conn *isert_conn); +static int +isert_rdma_accept(struct isert_conn *isert_conn); +struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np); + +static void isert_release_work(struct work_struct *work); +static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc); +static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc); +static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc); +static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc); + +static int isert_sg_tablesize_set(const char *val, const struct kernel_param *kp) +{ + int n = 0, ret; + + ret = kstrtoint(val, 10, &n); + if (ret != 0 || n < ISCSI_ISER_MIN_SG_TABLESIZE || + n > ISCSI_ISER_MAX_SG_TABLESIZE) + return -EINVAL; + + return param_set_int(val, kp); +} + + +static inline bool +isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd) +{ + return (conn->pi_support && + cmd->prot_op != TARGET_PROT_NORMAL); +} + + +static void +isert_qp_event_callback(struct ib_event *e, void *context) +{ + struct isert_conn *isert_conn = context; + + isert_err("%s (%d): conn %p\n", + ib_event_msg(e->event), e->event, isert_conn); + + switch (e->event) { + case IB_EVENT_COMM_EST: + rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST); + break; + case IB_EVENT_QP_LAST_WQE_REACHED: + isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n"); + break; + default: + break; + } +} + +static struct ib_qp * +isert_create_qp(struct isert_conn *isert_conn, + struct rdma_cm_id *cma_id) +{ + u32 cq_size = ISERT_QP_MAX_REQ_DTOS + ISERT_QP_MAX_RECV_DTOS + 2; + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct ib_qp_init_attr attr; + int ret, factor; + + isert_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_WORKQUEUE); + if (IS_ERR(isert_conn->cq)) { + isert_err("Unable to allocate cq\n"); + ret = PTR_ERR(isert_conn->cq); + return ERR_PTR(ret); + } + isert_conn->cq_size = cq_size; + + memset(&attr, 0, sizeof(struct ib_qp_init_attr)); + attr.event_handler = isert_qp_event_callback; + attr.qp_context = isert_conn; + attr.send_cq = isert_conn->cq; + attr.recv_cq = isert_conn->cq; + attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1; + attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1; + factor = rdma_rw_mr_factor(device->ib_device, cma_id->port_num, + isert_sg_tablesize); + attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX * factor; + attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge; + attr.cap.max_recv_sge = 1; + attr.sq_sig_type = IB_SIGNAL_REQ_WR; + attr.qp_type = IB_QPT_RC; + if (device->pi_capable) + attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN; + + ret = rdma_create_qp(cma_id, device->pd, &attr); + if (ret) { + isert_err("rdma_create_qp failed for cma_id %d\n", ret); + ib_cq_pool_put(isert_conn->cq, isert_conn->cq_size); + + return ERR_PTR(ret); + } + + return cma_id->qp; +} + +static int +isert_alloc_rx_descriptors(struct isert_conn *isert_conn) +{ + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct iser_rx_desc *rx_desc; + struct ib_sge *rx_sg; + u64 dma_addr; + int i, j; + + isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS, + sizeof(struct iser_rx_desc), + GFP_KERNEL); + if (!isert_conn->rx_descs) + return -ENOMEM; + + rx_desc = isert_conn->rx_descs; + + for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { + dma_addr = ib_dma_map_single(ib_dev, rx_desc->buf, + ISER_RX_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 + isert_get_hdr_offset(rx_desc); + rx_sg->length = ISER_RX_PAYLOAD_SIZE; + rx_sg->lkey = device->pd->local_dma_lkey; + rx_desc->rx_cqe.done = isert_recv_done; + } + + return 0; + +dma_map_fail: + rx_desc = isert_conn->rx_descs; + for (j = 0; j < i; j++, rx_desc++) { + ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, + ISER_RX_SIZE, DMA_FROM_DEVICE); + } + kfree(isert_conn->rx_descs); + isert_conn->rx_descs = NULL; + isert_err("conn %p failed to allocate rx descriptors\n", isert_conn); + return -ENOMEM; +} + +static void +isert_free_rx_descriptors(struct isert_conn *isert_conn) +{ + struct ib_device *ib_dev = isert_conn->device->ib_device; + struct iser_rx_desc *rx_desc; + int i; + + if (!isert_conn->rx_descs) + return; + + rx_desc = isert_conn->rx_descs; + for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { + ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, + ISER_RX_SIZE, DMA_FROM_DEVICE); + } + + kfree(isert_conn->rx_descs); + isert_conn->rx_descs = NULL; +} + +static int +isert_create_device_ib_res(struct isert_device *device) +{ + struct ib_device *ib_dev = device->ib_device; + int ret; + + isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n", + ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge); + isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd); + + device->pd = ib_alloc_pd(ib_dev, 0); + if (IS_ERR(device->pd)) { + ret = PTR_ERR(device->pd); + isert_err("failed to allocate pd, device %p, ret=%d\n", + device, ret); + return ret; + } + + /* Check signature cap */ + device->pi_capable = ib_dev->attrs.device_cap_flags & + IB_DEVICE_INTEGRITY_HANDOVER ? true : false; + + return 0; +} + +static void +isert_free_device_ib_res(struct isert_device *device) +{ + isert_info("device %p\n", device); + + ib_dealloc_pd(device->pd); +} + +static void +isert_device_put(struct isert_device *device) +{ + mutex_lock(&device_list_mutex); + device->refcount--; + isert_info("device %p refcount %d\n", device, device->refcount); + if (!device->refcount) { + isert_free_device_ib_res(device); + list_del(&device->dev_node); + kfree(device); + } + mutex_unlock(&device_list_mutex); +} + +static struct isert_device * +isert_device_get(struct rdma_cm_id *cma_id) +{ + struct isert_device *device; + int ret; + + mutex_lock(&device_list_mutex); + list_for_each_entry(device, &device_list, dev_node) { + if (device->ib_device->node_guid == cma_id->device->node_guid) { + device->refcount++; + isert_info("Found iser device %p refcount %d\n", + device, device->refcount); + mutex_unlock(&device_list_mutex); + return device; + } + } + + device = kzalloc(sizeof(struct isert_device), GFP_KERNEL); + if (!device) { + mutex_unlock(&device_list_mutex); + return ERR_PTR(-ENOMEM); + } + + INIT_LIST_HEAD(&device->dev_node); + + device->ib_device = cma_id->device; + ret = isert_create_device_ib_res(device); + if (ret) { + kfree(device); + mutex_unlock(&device_list_mutex); + return ERR_PTR(ret); + } + + device->refcount++; + list_add_tail(&device->dev_node, &device_list); + isert_info("Created a new iser device %p refcount %d\n", + device, device->refcount); + mutex_unlock(&device_list_mutex); + + return device; +} + +static void +isert_init_conn(struct isert_conn *isert_conn) +{ + isert_conn->state = ISER_CONN_INIT; + INIT_LIST_HEAD(&isert_conn->node); + init_completion(&isert_conn->login_comp); + init_completion(&isert_conn->login_req_comp); + init_waitqueue_head(&isert_conn->rem_wait); + kref_init(&isert_conn->kref); + mutex_init(&isert_conn->mutex); + INIT_WORK(&isert_conn->release_work, isert_release_work); +} + +static void +isert_free_login_buf(struct isert_conn *isert_conn) +{ + struct ib_device *ib_dev = isert_conn->device->ib_device; + + ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, + ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE); + kfree(isert_conn->login_rsp_buf); + + ib_dma_unmap_single(ib_dev, isert_conn->login_desc->dma_addr, + ISER_RX_SIZE, DMA_FROM_DEVICE); + kfree(isert_conn->login_desc); +} + +static int +isert_alloc_login_buf(struct isert_conn *isert_conn, + struct ib_device *ib_dev) +{ + int ret; + + isert_conn->login_desc = kzalloc(sizeof(*isert_conn->login_desc), + GFP_KERNEL); + if (!isert_conn->login_desc) + return -ENOMEM; + + isert_conn->login_desc->dma_addr = ib_dma_map_single(ib_dev, + isert_conn->login_desc->buf, + ISER_RX_SIZE, DMA_FROM_DEVICE); + ret = ib_dma_mapping_error(ib_dev, isert_conn->login_desc->dma_addr); + if (ret) { + isert_err("login_desc dma mapping error: %d\n", ret); + isert_conn->login_desc->dma_addr = 0; + goto out_free_login_desc; + } + + isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL); + if (!isert_conn->login_rsp_buf) { + ret = -ENOMEM; + goto out_unmap_login_desc; + } + + isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, + isert_conn->login_rsp_buf, + ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE); + ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); + if (ret) { + isert_err("login_rsp_dma mapping error: %d\n", ret); + isert_conn->login_rsp_dma = 0; + goto out_free_login_rsp_buf; + } + + return 0; + +out_free_login_rsp_buf: + kfree(isert_conn->login_rsp_buf); +out_unmap_login_desc: + ib_dma_unmap_single(ib_dev, isert_conn->login_desc->dma_addr, + ISER_RX_SIZE, DMA_FROM_DEVICE); +out_free_login_desc: + kfree(isert_conn->login_desc); + return ret; +} + +static void +isert_set_nego_params(struct isert_conn *isert_conn, + struct rdma_conn_param *param) +{ + struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs; + + /* Set max inflight RDMA READ requests */ + isert_conn->initiator_depth = min_t(u8, param->initiator_depth, + attr->max_qp_init_rd_atom); + isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth); + + if (param->private_data) { + u8 flags = *(u8 *)param->private_data; + + /* + * use remote invalidation if the both initiator + * and the HCA support it + */ + isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) && + (attr->device_cap_flags & + IB_DEVICE_MEM_MGT_EXTENSIONS); + if (isert_conn->snd_w_inv) + isert_info("Using remote invalidation\n"); + } +} + +static void +isert_destroy_qp(struct isert_conn *isert_conn) +{ + ib_destroy_qp(isert_conn->qp); + ib_cq_pool_put(isert_conn->cq, isert_conn->cq_size); +} + +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, IB_CM_REJ_CONSUMER_DEFINED); + } + 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; + + device = isert_device_get(cma_id); + if (IS_ERR(device)) { + ret = PTR_ERR(device); + goto out; + } + isert_conn->device = device; + + ret = isert_alloc_login_buf(isert_conn, cma_id->device); + if (ret) + goto out_conn_dev; + + isert_set_nego_params(isert_conn, &event->param.conn); + + isert_conn->qp = isert_create_qp(isert_conn, cma_id); + if (IS_ERR(isert_conn->qp)) { + ret = PTR_ERR(isert_conn->qp); + goto out_rsp_dma_map; + } + + ret = isert_login_post_recv(isert_conn); + if (ret) + goto out_destroy_qp; + + ret = isert_rdma_accept(isert_conn); + if (ret) + goto out_destroy_qp; + + mutex_lock(&isert_np->mutex); + list_add_tail(&isert_conn->node, &isert_np->accepted); + mutex_unlock(&isert_np->mutex); + + return 0; + +out_destroy_qp: + isert_destroy_qp(isert_conn); +out_rsp_dma_map: + isert_free_login_buf(isert_conn); +out_conn_dev: + isert_device_put(device); +out: + kfree(isert_conn); + rdma_reject(cma_id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED); + return ret; +} + +static void +isert_connect_release(struct isert_conn *isert_conn) +{ + struct isert_device *device = isert_conn->device; + + isert_dbg("conn %p\n", isert_conn); + + BUG_ON(!device); + + isert_free_rx_descriptors(isert_conn); + if (isert_conn->cm_id && + !isert_conn->dev_removed) + rdma_destroy_id(isert_conn->cm_id); + + if (isert_conn->qp) + isert_destroy_qp(isert_conn); + + if (isert_conn->login_desc) + isert_free_login_buf(isert_conn); + + isert_device_put(device); + + if (isert_conn->dev_removed) + wake_up_interruptible(&isert_conn->rem_wait); + else + kfree(isert_conn); +} + +static void +isert_connected_handler(struct rdma_cm_id *cma_id) +{ + struct isert_conn *isert_conn = cma_id->qp->qp_context; + struct isert_np *isert_np = cma_id->context; + + isert_info("conn %p\n", isert_conn); + + mutex_lock(&isert_conn->mutex); + isert_conn->state = ISER_CONN_UP; + kref_get(&isert_conn->kref); + mutex_unlock(&isert_conn->mutex); + + mutex_lock(&isert_np->mutex); + list_move_tail(&isert_conn->node, &isert_np->pending); + mutex_unlock(&isert_np->mutex); + + isert_info("np %p: Allow accept_np to continue\n", isert_np); + up(&isert_np->sem); +} + +static void +isert_release_kref(struct kref *kref) +{ + struct isert_conn *isert_conn = container_of(kref, + struct isert_conn, kref); + + isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm, + current->pid); + + isert_connect_release(isert_conn); +} + +static void +isert_put_conn(struct isert_conn *isert_conn) +{ + kref_put(&isert_conn->kref, isert_release_kref); +} + +static void +isert_handle_unbound_conn(struct isert_conn *isert_conn) +{ + struct isert_np *isert_np = isert_conn->cm_id->context; + + mutex_lock(&isert_np->mutex); + if (!list_empty(&isert_conn->node)) { + /* + * This means iscsi doesn't know this connection + * so schedule a cleanup ourselves + */ + list_del_init(&isert_conn->node); + isert_put_conn(isert_conn); + queue_work(isert_release_wq, &isert_conn->release_work); + } + mutex_unlock(&isert_np->mutex); +} + +/** + * isert_conn_terminate() - Initiate connection termination + * @isert_conn: isert connection struct + * + * Notes: + * In case the connection state is BOUND, move state + * to TEMINATING and start teardown sequence (rdma_disconnect). + * In case the connection state is UP, complete flush as well. + * + * This routine must be called with mutex held. Thus it is + * safe to call multiple times. + */ +static void +isert_conn_terminate(struct isert_conn *isert_conn) +{ + int err; + + if (isert_conn->state >= ISER_CONN_TERMINATING) + return; + + isert_info("Terminating conn %p state %d\n", + isert_conn, isert_conn->state); + isert_conn->state = ISER_CONN_TERMINATING; + err = rdma_disconnect(isert_conn->cm_id); + if (err) + isert_warn("Failed rdma_disconnect isert_conn %p\n", + isert_conn); +} + +static int +isert_np_cma_handler(struct isert_np *isert_np, + enum rdma_cm_event_type event) +{ + isert_dbg("%s (%d): isert np %p\n", + rdma_event_msg(event), event, isert_np); + + switch (event) { + case RDMA_CM_EVENT_DEVICE_REMOVAL: + isert_np->cm_id = NULL; + break; + case RDMA_CM_EVENT_ADDR_CHANGE: + isert_np->cm_id = isert_setup_id(isert_np); + if (IS_ERR(isert_np->cm_id)) { + isert_err("isert np %p setup id failed: %ld\n", + isert_np, PTR_ERR(isert_np->cm_id)); + isert_np->cm_id = NULL; + } + break; + default: + isert_err("isert np %p Unexpected event %d\n", + isert_np, event); + } + + return -1; +} + +static int +isert_disconnected_handler(struct rdma_cm_id *cma_id, + enum rdma_cm_event_type event) +{ + struct isert_conn *isert_conn = cma_id->qp->qp_context; + + mutex_lock(&isert_conn->mutex); + switch (isert_conn->state) { + case ISER_CONN_TERMINATING: + break; + case ISER_CONN_UP: + isert_conn_terminate(isert_conn); + ib_drain_qp(isert_conn->qp); + isert_handle_unbound_conn(isert_conn); + break; + case ISER_CONN_BOUND: + case ISER_CONN_FULL_FEATURE: /* FALLTHRU */ + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + break; + default: + isert_warn("conn %p terminating in state %d\n", + isert_conn, isert_conn->state); + } + mutex_unlock(&isert_conn->mutex); + + return 0; +} + +static int +isert_connect_error(struct rdma_cm_id *cma_id) +{ + struct isert_conn *isert_conn = cma_id->qp->qp_context; + struct isert_np *isert_np = cma_id->context; + + ib_drain_qp(isert_conn->qp); + + mutex_lock(&isert_np->mutex); + list_del_init(&isert_conn->node); + mutex_unlock(&isert_np->mutex); + isert_conn->cm_id = NULL; + isert_put_conn(isert_conn); + + return -1; +} + +static int +isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) +{ + struct isert_np *isert_np = cma_id->context; + struct isert_conn *isert_conn; + int ret = 0; + + isert_info("%s (%d): status %d id %p np %p\n", + rdma_event_msg(event->event), event->event, + event->status, cma_id, cma_id->context); + + if (isert_np->cm_id == cma_id) + return isert_np_cma_handler(cma_id->context, event->event); + + switch (event->event) { + case RDMA_CM_EVENT_CONNECT_REQUEST: + ret = isert_connect_request(cma_id, event); + if (ret) + isert_err("failed handle connect request %d\n", ret); + break; + case RDMA_CM_EVENT_ESTABLISHED: + isert_connected_handler(cma_id); + break; + case RDMA_CM_EVENT_ADDR_CHANGE: + case RDMA_CM_EVENT_DISCONNECTED: + case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */ + ret = isert_disconnected_handler(cma_id, event->event); + break; + case RDMA_CM_EVENT_DEVICE_REMOVAL: + isert_conn = cma_id->qp->qp_context; + isert_conn->dev_removed = true; + isert_disconnected_handler(cma_id, event->event); + wait_event_interruptible(isert_conn->rem_wait, + isert_conn->state == ISER_CONN_DOWN); + kfree(isert_conn); + /* + * return non-zero from the callback to destroy + * the rdma cm id + */ + return 1; + case RDMA_CM_EVENT_REJECTED: + isert_info("Connection rejected: %s\n", + rdma_reject_msg(cma_id, event->status)); + fallthrough; + case RDMA_CM_EVENT_UNREACHABLE: + case RDMA_CM_EVENT_CONNECT_ERROR: + ret = isert_connect_error(cma_id); + break; + default: + isert_err("Unhandled RDMA CMA event: %d\n", event->event); + break; + } + + return ret; +} + +static int +isert_post_recvm(struct isert_conn *isert_conn, u32 count) +{ + struct ib_recv_wr *rx_wr; + int i, ret; + struct iser_rx_desc *rx_desc; + + for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { + rx_desc = &isert_conn->rx_descs[i]; + + rx_wr->wr_cqe = &rx_desc->rx_cqe; + rx_wr->sg_list = &rx_desc->rx_sg; + rx_wr->num_sge = 1; + rx_wr->next = rx_wr + 1; + rx_desc->in_use = false; + } + rx_wr--; + rx_wr->next = NULL; /* mark end of work requests list */ + + ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL); + if (ret) + isert_err("ib_post_recv() failed with ret: %d\n", ret); + + return ret; +} + +static int +isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc) +{ + struct ib_recv_wr rx_wr; + int ret; + + if (!rx_desc->in_use) { + /* + * if the descriptor is not in-use we already reposted it + * for recv, so just silently return + */ + return 0; + } + + rx_desc->in_use = false; + rx_wr.wr_cqe = &rx_desc->rx_cqe; + rx_wr.sg_list = &rx_desc->rx_sg; + rx_wr.num_sge = 1; + rx_wr.next = NULL; + + ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL); + if (ret) + isert_err("ib_post_recv() failed with ret: %d\n", ret); + + return ret; +} + +static int +isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) +{ + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct ib_send_wr send_wr; + int ret; + + ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, + ISER_HEADERS_LEN, DMA_TO_DEVICE); + + tx_desc->tx_cqe.done = isert_login_send_done; + + send_wr.next = NULL; + send_wr.wr_cqe = &tx_desc->tx_cqe; + send_wr.sg_list = tx_desc->tx_sg; + send_wr.num_sge = tx_desc->num_sge; + send_wr.opcode = IB_WR_SEND; + send_wr.send_flags = IB_SEND_SIGNALED; + + ret = ib_post_send(isert_conn->qp, &send_wr, NULL); + if (ret) + isert_err("ib_post_send() failed, ret: %d\n", ret); + + return ret; +} + +static void +__isert_create_send_desc(struct isert_device *device, + struct iser_tx_desc *tx_desc) +{ + + memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl)); + tx_desc->iser_header.flags = ISCSI_CTRL; + + tx_desc->num_sge = 1; + + if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) { + tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; + isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc); + } +} + +static void +isert_create_send_desc(struct isert_conn *isert_conn, + struct isert_cmd *isert_cmd, + struct iser_tx_desc *tx_desc) +{ + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + + ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr, + ISER_HEADERS_LEN, DMA_TO_DEVICE); + + __isert_create_send_desc(device, tx_desc); +} + +static int +isert_init_tx_hdrs(struct isert_conn *isert_conn, + struct iser_tx_desc *tx_desc) +{ + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + u64 dma_addr; + + dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc, + ISER_HEADERS_LEN, DMA_TO_DEVICE); + if (ib_dma_mapping_error(ib_dev, dma_addr)) { + isert_err("ib_dma_mapping_error() failed\n"); + return -ENOMEM; + } + + tx_desc->dma_addr = dma_addr; + tx_desc->tx_sg[0].addr = tx_desc->dma_addr; + tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; + tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; + + isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n", + tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length, + tx_desc->tx_sg[0].lkey); + + return 0; +} + +static void +isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, + struct ib_send_wr *send_wr) +{ + struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc; + + tx_desc->tx_cqe.done = isert_send_done; + send_wr->wr_cqe = &tx_desc->tx_cqe; + + if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) { + send_wr->opcode = IB_WR_SEND_WITH_INV; + send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey; + } else { + send_wr->opcode = IB_WR_SEND; + } + + send_wr->sg_list = &tx_desc->tx_sg[0]; + send_wr->num_sge = isert_cmd->tx_desc.num_sge; + send_wr->send_flags = IB_SEND_SIGNALED; +} + +static int +isert_login_post_recv(struct isert_conn *isert_conn) +{ + struct ib_recv_wr rx_wr; + struct ib_sge sge; + int ret; + + memset(&sge, 0, sizeof(struct ib_sge)); + sge.addr = isert_conn->login_desc->dma_addr + + isert_get_hdr_offset(isert_conn->login_desc); + sge.length = ISER_RX_PAYLOAD_SIZE; + sge.lkey = isert_conn->device->pd->local_dma_lkey; + + isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n", + sge.addr, sge.length, sge.lkey); + + isert_conn->login_desc->rx_cqe.done = isert_login_recv_done; + + memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); + rx_wr.wr_cqe = &isert_conn->login_desc->rx_cqe; + rx_wr.sg_list = &sge; + rx_wr.num_sge = 1; + + ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL); + if (ret) + isert_err("ib_post_recv() failed: %d\n", ret); + + return ret; +} + +static int +isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, + u32 length) +{ + struct isert_conn *isert_conn = conn->context; + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc; + int ret; + + __isert_create_send_desc(device, tx_desc); + + memcpy(&tx_desc->iscsi_header, &login->rsp[0], + sizeof(struct iscsi_hdr)); + + isert_init_tx_hdrs(isert_conn, tx_desc); + + if (length > 0) { + struct ib_sge *tx_dsg = &tx_desc->tx_sg[1]; + + ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma, + length, DMA_TO_DEVICE); + + memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length); + + ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma, + length, DMA_TO_DEVICE); + + tx_dsg->addr = isert_conn->login_rsp_dma; + tx_dsg->length = length; + tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey; + tx_desc->num_sge = 2; + } + if (!login->login_failed) { + if (login->login_complete) { + ret = isert_alloc_rx_descriptors(isert_conn); + if (ret) + return ret; + + ret = isert_post_recvm(isert_conn, + ISERT_QP_MAX_RECV_DTOS); + if (ret) + return ret; + + /* Now we are in FULL_FEATURE phase */ + mutex_lock(&isert_conn->mutex); + isert_conn->state = ISER_CONN_FULL_FEATURE; + mutex_unlock(&isert_conn->mutex); + goto post_send; + } + + ret = isert_login_post_recv(isert_conn); + if (ret) + return ret; + } +post_send: + ret = isert_login_post_send(isert_conn, tx_desc); + if (ret) + return ret; + + return 0; +} + +static void +isert_rx_login_req(struct isert_conn *isert_conn) +{ + struct iser_rx_desc *rx_desc = isert_conn->login_desc; + 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 *)isert_get_iscsi_hdr(rx_desc); + /* + * 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], isert_get_iscsi_hdr(rx_desc), 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, isert_get_data(rx_desc), 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, + isert_get_data(rx_desc), 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, isert_get_data(rx_desc), + imm_data_len); + isert_dbg("Transfer Immediate imm_data_len: %d\n", + imm_data_len); + } + + cmd->write_data_done += imm_data_len; + + if (cmd->write_data_done == cmd->se_cmd.data_length) { + spin_lock_bh(&cmd->istate_lock); + cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; + cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; + spin_unlock_bh(&cmd->istate_lock); + } + +sequence_cmd: + rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); + + if (!rc && dump_payload == false && unsol_data) + iscsit_set_unsolicited_dataout(cmd); + else if (dump_payload && imm_data) + target_put_sess_cmd(&cmd->se_cmd); + + return 0; +} + +static int +isert_handle_iscsi_dataout(struct isert_conn *isert_conn, + struct iser_rx_desc *rx_desc, unsigned char *buf) +{ + struct scatterlist *sg_start; + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_cmd *cmd = NULL; + struct iscsi_data *hdr = (struct iscsi_data *)buf; + u32 unsol_data_len = ntoh24(hdr->dlength); + int rc, sg_nents, sg_off, page_off; + + rc = iscsit_check_dataout_hdr(conn, buf, &cmd); + if (rc < 0) + return rc; + else if (!cmd) + return 0; + /* + * FIXME: Unexpected unsolicited_data out + */ + if (!cmd->unsolicited_data) { + isert_err("Received unexpected solicited data payload\n"); + dump_stack(); + return -1; + } + + isert_dbg("Unsolicited DataOut unsol_data_len: %u, " + "write_data_done: %u, data_length: %u\n", + unsol_data_len, cmd->write_data_done, + cmd->se_cmd.data_length); + + sg_off = cmd->write_data_done / PAGE_SIZE; + sg_start = &cmd->se_cmd.t_data_sg[sg_off]; + sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE)); + page_off = cmd->write_data_done % PAGE_SIZE; + /* + * FIXME: Non page-aligned unsolicited_data out + */ + if (page_off) { + isert_err("unexpected non-page aligned data payload\n"); + dump_stack(); + return -1; + } + isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u " + "sg_nents: %u from %p %u\n", sg_start, sg_off, + sg_nents, isert_get_data(rx_desc), unsol_data_len); + + sg_copy_from_buffer(sg_start, sg_nents, isert_get_data(rx_desc), + 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 + */ + return isert_post_recv(isert_conn, rx_desc); +} + +static int +isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, + struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, + unsigned char *buf) +{ + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; + int rc; + + rc = iscsit_setup_nop_out(conn, cmd, hdr); + if (rc < 0) + return rc; + /* + * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload + */ + + return iscsit_process_nop_out(conn, cmd, hdr); +} + +static int +isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, + struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, + struct iscsi_text *hdr) +{ + struct iscsi_conn *conn = isert_conn->conn; + u32 payload_length = ntoh24(hdr->dlength); + int rc; + unsigned char *text_in = NULL; + + rc = iscsit_setup_text_cmd(conn, cmd, hdr); + if (rc < 0) + return rc; + + if (payload_length) { + text_in = kzalloc(payload_length, GFP_KERNEL); + if (!text_in) + return -ENOMEM; + } + cmd->text_in_ptr = text_in; + + memcpy(cmd->text_in_ptr, isert_get_data(rx_desc), 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 = isert_get_iscsi_hdr(rx_desc); + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_cmd *cmd; + struct isert_cmd *isert_cmd; + int ret = -EINVAL; + u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); + + if (conn->sess->sess_ops->SessionType && + (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) { + isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery," + " ignoring\n", opcode); + return 0; + } + + switch (opcode) { + case ISCSI_OP_SCSI_CMD: + cmd = isert_allocate_cmd(conn, rx_desc); + if (!cmd) + break; + + isert_cmd = iscsit_priv_cmd(cmd); + isert_cmd->read_stag = read_stag; + isert_cmd->read_va = read_va; + isert_cmd->write_stag = write_stag; + isert_cmd->write_va = write_va; + isert_cmd->inv_rkey = read_stag ? read_stag : write_stag; + + ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd, + rx_desc, (unsigned char *)hdr); + break; + case ISCSI_OP_NOOP_OUT: + cmd = isert_allocate_cmd(conn, rx_desc); + if (!cmd) + break; + + isert_cmd = iscsit_priv_cmd(cmd); + ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd, + rx_desc, (unsigned char *)hdr); + break; + case ISCSI_OP_SCSI_DATA_OUT: + ret = isert_handle_iscsi_dataout(isert_conn, rx_desc, + (unsigned char *)hdr); + break; + case ISCSI_OP_SCSI_TMFUNC: + cmd = isert_allocate_cmd(conn, rx_desc); + if (!cmd) + break; + + ret = iscsit_handle_task_mgt_cmd(conn, cmd, + (unsigned char *)hdr); + break; + case ISCSI_OP_LOGOUT: + cmd = isert_allocate_cmd(conn, rx_desc); + if (!cmd) + break; + + ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); + break; + case ISCSI_OP_TEXT: + if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) + cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); + else + cmd = isert_allocate_cmd(conn, rx_desc); + + if (!cmd) + break; + + isert_cmd = iscsit_priv_cmd(cmd); + ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd, + rx_desc, (struct iscsi_text *)hdr); + break; + default: + isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); + dump_stack(); + break; + } + + return ret; +} + +static void +isert_print_wc(struct ib_wc *wc, const char *type) +{ + if (wc->status != IB_WC_WR_FLUSH_ERR) + isert_err("%s failure: %s (%d) vend_err %x\n", type, + ib_wc_status_msg(wc->status), wc->status, + wc->vendor_err); + else + isert_dbg("%s failure: %s (%d)\n", type, + ib_wc_status_msg(wc->status), wc->status); +} + +static void +isert_recv_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct isert_conn *isert_conn = wc->qp->qp_context; + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe); + struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc); + struct iser_ctrl *iser_ctrl = isert_get_iser_hdr(rx_desc); + uint64_t read_va = 0, write_va = 0; + uint32_t read_stag = 0, write_stag = 0; + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + isert_print_wc(wc, "recv"); + if (wc->status != IB_WC_WR_FLUSH_ERR) + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + return; + } + + rx_desc->in_use = true; + + ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr, + ISER_RX_SIZE, DMA_FROM_DEVICE); + + isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", + rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags, + (int)(wc->byte_len - ISER_HEADERS_LEN)); + + switch (iser_ctrl->flags & 0xF0) { + case ISCSI_CTRL: + if (iser_ctrl->flags & ISER_RSV) { + read_stag = be32_to_cpu(iser_ctrl->read_stag); + read_va = be64_to_cpu(iser_ctrl->read_va); + isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n", + read_stag, (unsigned long long)read_va); + } + if (iser_ctrl->flags & ISER_WSV) { + write_stag = be32_to_cpu(iser_ctrl->write_stag); + write_va = be64_to_cpu(iser_ctrl->write_va); + isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n", + write_stag, (unsigned long long)write_va); + } + + isert_dbg("ISER ISCSI_CTRL PDU\n"); + break; + case ISER_HELLO: + isert_err("iSER Hello message\n"); + break; + default: + isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags); + break; + } + + isert_rx_opcode(isert_conn, rx_desc, + read_stag, read_va, write_stag, write_va); + + ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr, + ISER_RX_SIZE, DMA_FROM_DEVICE); +} + +static void +isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct isert_conn *isert_conn = wc->qp->qp_context; + struct ib_device *ib_dev = isert_conn->device->ib_device; + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + isert_print_wc(wc, "login recv"); + return; + } + + ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_desc->dma_addr, + ISER_RX_SIZE, DMA_FROM_DEVICE); + + isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN; + + if (isert_conn->conn) { + struct iscsi_login *login = isert_conn->conn->conn_login; + + if (login && !login->first_request) + isert_rx_login_req(isert_conn); + } + + mutex_lock(&isert_conn->mutex); + complete(&isert_conn->login_req_comp); + mutex_unlock(&isert_conn->mutex); + + ib_dma_sync_single_for_device(ib_dev, isert_conn->login_desc->dma_addr, + ISER_RX_SIZE, DMA_FROM_DEVICE); +} + +static void +isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn) +{ + struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd; + enum dma_data_direction dir = target_reverse_dma_direction(se_cmd); + + if (!cmd->rw.nr_ops) + return; + + if (isert_prot_cmd(conn, se_cmd)) { + rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp, + conn->cm_id->port_num, se_cmd->t_data_sg, + se_cmd->t_data_nents, se_cmd->t_prot_sg, + se_cmd->t_prot_nents, dir); + } else { + rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num, + se_cmd->t_data_sg, se_cmd->t_data_nents, dir); + } + + cmd->rw.nr_ops = 0; +} + +static void +isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err) +{ + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + struct isert_conn *isert_conn = isert_cmd->conn; + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_text_rsp *hdr; + + isert_dbg("Cmd %p\n", isert_cmd); + + switch (cmd->iscsi_opcode) { + case ISCSI_OP_SCSI_CMD: + spin_lock_bh(&conn->cmd_lock); + if (!list_empty(&cmd->i_conn_node)) + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + + if (cmd->data_direction == DMA_TO_DEVICE) { + iscsit_stop_dataout_timer(cmd); + /* + * Check for special case during comp_err where + * WRITE_PENDING has been handed off from core, + * but requires an extra target_put_sess_cmd() + * before transport_generic_free_cmd() below. + */ + if (comp_err && + cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { + struct se_cmd *se_cmd = &cmd->se_cmd; + + target_put_sess_cmd(se_cmd); + } + } + + isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); + transport_generic_free_cmd(&cmd->se_cmd, 0); + break; + case ISCSI_OP_SCSI_TMFUNC: + spin_lock_bh(&conn->cmd_lock); + if (!list_empty(&cmd->i_conn_node)) + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + + transport_generic_free_cmd(&cmd->se_cmd, 0); + break; + case ISCSI_OP_REJECT: + case ISCSI_OP_NOOP_OUT: + case ISCSI_OP_TEXT: + hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; + /* If the continue bit is on, keep the command alive */ + if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE) + break; + + spin_lock_bh(&conn->cmd_lock); + if (!list_empty(&cmd->i_conn_node)) + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + + /* + * Handle special case for REJECT when iscsi_add_reject*() has + * overwritten the original iscsi_opcode assignment, and the + * associated cmd->se_cmd needs to be released. + */ + if (cmd->se_cmd.se_tfo != NULL) { + isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n", + cmd->iscsi_opcode); + transport_generic_free_cmd(&cmd->se_cmd, 0); + break; + } + fallthrough; + 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->sense_info = 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->sense_info, + mr_status.sig_err.expected, + mr_status.sig_err.actual); + ret = 1; + } + +fail_mr_status: + return ret; +} + +static void +isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct isert_conn *isert_conn = wc->qp->qp_context; + struct isert_device *device = isert_conn->device; + struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe); + struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc); + struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd; + int ret = 0; + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + isert_print_wc(wc, "rdma write"); + if (wc->status != IB_WC_WR_FLUSH_ERR) + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + isert_completion_put(desc, isert_cmd, device->ib_device, true); + return; + } + + isert_dbg("Cmd %p\n", isert_cmd); + + ret = isert_check_pi_status(cmd, isert_cmd->rw.reg->mr); + isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); + + if (ret) { + /* + * transport_generic_request_failure() expects to have + * plus two references to handle queue-full, so re-add + * one here as target-core will have already dropped + * it after the first isert_put_datain() callback. + */ + kref_get(&cmd->cmd_kref); + transport_generic_request_failure(cmd, cmd->pi_err); + } else { + /* + * XXX: isert_put_response() failure is not retried. + */ + ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd); + if (ret) + pr_warn_ratelimited("isert_put_response() ret: %d\n", ret); + } +} + +static void +isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct isert_conn *isert_conn = wc->qp->qp_context; + struct isert_device *device = isert_conn->device; + struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe); + struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc); + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + struct se_cmd *se_cmd = &cmd->se_cmd; + int ret = 0; + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + isert_print_wc(wc, "rdma read"); + if (wc->status != IB_WC_WR_FLUSH_ERR) + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + isert_completion_put(desc, isert_cmd, device->ib_device, true); + return; + } + + isert_dbg("Cmd %p\n", isert_cmd); + + iscsit_stop_dataout_timer(cmd); + + if (isert_prot_cmd(isert_conn, se_cmd)) + ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr); + isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); + cmd->write_data_done = 0; + + isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd); + spin_lock_bh(&cmd->istate_lock); + cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; + cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; + spin_unlock_bh(&cmd->istate_lock); + + /* + * transport_generic_request_failure() will drop the extra + * se_cmd->cmd_kref reference after T10-PI error, and handle + * any non-zero ->queue_status() callback error retries. + */ + if (ret) + transport_generic_request_failure(se_cmd, se_cmd->pi_err); + else + target_execute_cmd(se_cmd); +} + +static void +isert_do_control_comp(struct work_struct *work) +{ + struct isert_cmd *isert_cmd = container_of(work, + struct isert_cmd, comp_work); + struct isert_conn *isert_conn = isert_cmd->conn; + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + + isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state); + + switch (cmd->i_state) { + case ISTATE_SEND_TASKMGTRSP: + iscsit_tmr_post_handler(cmd, cmd->conn); + fallthrough; + case ISTATE_SEND_REJECT: + case ISTATE_SEND_TEXTRSP: + cmd->i_state = ISTATE_SENT_STATUS; + isert_completion_put(&isert_cmd->tx_desc, isert_cmd, + ib_dev, false); + break; + case ISTATE_SEND_LOGOUTRSP: + iscsit_logout_post_handler(cmd, cmd->conn); + break; + default: + isert_err("Unknown i_state %d\n", cmd->i_state); + dump_stack(); + break; + } +} + +static void +isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct isert_conn *isert_conn = wc->qp->qp_context; + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe); + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + isert_print_wc(wc, "login send"); + if (wc->status != IB_WC_WR_FLUSH_ERR) + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + } + + isert_unmap_tx_desc(tx_desc, ib_dev); +} + +static void +isert_send_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct isert_conn *isert_conn = wc->qp->qp_context; + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe); + struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc); + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + isert_print_wc(wc, "send"); + if (wc->status != IB_WC_WR_FLUSH_ERR) + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + isert_completion_put(tx_desc, isert_cmd, ib_dev, true); + return; + } + + isert_dbg("Cmd %p\n", isert_cmd); + + switch (isert_cmd->iscsi_cmd->i_state) { + case ISTATE_SEND_TASKMGTRSP: + case ISTATE_SEND_LOGOUTRSP: + case ISTATE_SEND_REJECT: + case ISTATE_SEND_TEXTRSP: + isert_unmap_tx_desc(tx_desc, ib_dev); + + INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp); + queue_work(isert_comp_wq, &isert_cmd->comp_work); + return; + default: + isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS; + isert_completion_put(tx_desc, isert_cmd, ib_dev, false); + break; + } +} + +static int +isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) +{ + int ret; + + ret = isert_post_recv(isert_conn, isert_cmd->rx_desc); + if (ret) + return ret; + + ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL); + if (ret) { + isert_err("ib_post_send failed with %d\n", ret); + return ret; + } + return ret; +} + +static int +isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *) + &isert_cmd->tx_desc.iscsi_header; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_rsp_pdu(cmd, conn, true, hdr); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + /* + * Attach SENSE DATA payload to iSCSI Response PDU + */ + if (cmd->se_cmd.sense_buffer && + ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || + (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; + u32 padding, pdu_len; + + put_unaligned_be16(cmd->se_cmd.scsi_sense_length, + cmd->sense_buffer); + cmd->se_cmd.scsi_sense_length += sizeof(__be16); + + padding = -(cmd->se_cmd.scsi_sense_length) & 3; + hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); + pdu_len = cmd->se_cmd.scsi_sense_length + padding; + + isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, + (void *)cmd->sense_buffer, pdu_len, + DMA_TO_DEVICE); + if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) + return -ENOMEM; + + isert_cmd->pdu_buf_len = pdu_len; + tx_dsg->addr = isert_cmd->pdu_buf_dma; + tx_dsg->length = pdu_len; + tx_dsg->lkey = device->pd->local_dma_lkey; + isert_cmd->tx_desc.num_sge = 2; + } + + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("Posting SCSI Response\n"); + + return isert_post_response(isert_conn, isert_cmd); +} + +static void +isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + + spin_lock_bh(&conn->cmd_lock); + if (!list_empty(&cmd->i_conn_node)) + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + + if (cmd->data_direction == DMA_TO_DEVICE) + iscsit_stop_dataout_timer(cmd); + isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); +} + +static enum target_prot_op +isert_get_sup_prot_ops(struct iscsi_conn *conn) +{ + struct isert_conn *isert_conn = conn->context; + struct isert_device *device = isert_conn->device; + + if (conn->tpg->tpg_attrib.t10_pi) { + if (device->pi_capable) { + isert_info("conn %p PI offload enabled\n", isert_conn); + isert_conn->pi_support = true; + return TARGET_PROT_ALL; + } + } + + isert_info("conn %p PI offload disabled\n", isert_conn); + isert_conn->pi_support = false; + + return TARGET_PROT_NORMAL; +} + +static int +isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn, + bool nopout_response) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *) + &isert_cmd->tx_desc.iscsi_header, + nopout_response); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Posting NOPIN Response\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *) + &isert_cmd->tx_desc.iscsi_header); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Posting Logout Response\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *) + &isert_cmd->tx_desc.iscsi_header); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Posting Task Management Response\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; + struct iscsi_reject *hdr = + (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_reject(cmd, conn, hdr); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + + hton24(hdr->dlength, ISCSI_HDR_LEN); + isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, + (void *)cmd->buf_ptr, ISCSI_HDR_LEN, + DMA_TO_DEVICE); + if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) + return -ENOMEM; + isert_cmd->pdu_buf_len = ISCSI_HDR_LEN; + tx_dsg->addr = isert_cmd->pdu_buf_dma; + tx_dsg->length = ISCSI_HDR_LEN; + tx_dsg->lkey = device->pd->local_dma_lkey; + isert_cmd->tx_desc.num_sge = 2; + + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Posting Reject\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + struct iscsi_text_rsp *hdr = + (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; + u32 txt_rsp_len; + int rc; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND); + if (rc < 0) + return rc; + + txt_rsp_len = rc; + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + + if (txt_rsp_len) { + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; + void *txt_rsp_buf = cmd->buf_ptr; + + isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, + txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE); + if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) + return -ENOMEM; + + isert_cmd->pdu_buf_len = txt_rsp_len; + tx_dsg->addr = isert_cmd->pdu_buf_dma; + tx_dsg->length = txt_rsp_len; + tx_dsg->lkey = device->pd->local_dma_lkey; + isert_cmd->tx_desc.num_sge = 2; + } + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Text Response\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static inline void +isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_domain *domain) +{ + domain->sig_type = IB_SIG_TYPE_T10_DIF; + domain->sig.dif.bg_type = IB_T10DIF_CRC; + domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size; + domain->sig.dif.ref_tag = se_cmd->reftag_seed; + /* + * At the moment we hard code those, but if in the future + * the target core would like to use it, we will take it + * from se_cmd. + */ + domain->sig.dif.apptag_check_mask = 0xffff; + domain->sig.dif.app_escape = true; + domain->sig.dif.ref_escape = true; + if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT || + se_cmd->prot_type == TARGET_DIF_TYPE2_PROT) + domain->sig.dif.ref_remap = true; +}; + +static int +isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs) +{ + memset(sig_attrs, 0, sizeof(*sig_attrs)); + + switch (se_cmd->prot_op) { + case TARGET_PROT_DIN_INSERT: + case TARGET_PROT_DOUT_STRIP: + sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; + isert_set_dif_domain(se_cmd, &sig_attrs->wire); + break; + case TARGET_PROT_DOUT_INSERT: + case TARGET_PROT_DIN_STRIP: + sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; + isert_set_dif_domain(se_cmd, &sig_attrs->mem); + break; + case TARGET_PROT_DIN_PASS: + case TARGET_PROT_DOUT_PASS: + isert_set_dif_domain(se_cmd, &sig_attrs->wire); + isert_set_dif_domain(se_cmd, &sig_attrs->mem); + break; + default: + isert_err("Unsupported PI operation %d\n", se_cmd->prot_op); + return -EINVAL; + } + + if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD) + sig_attrs->check_mask |= IB_SIG_CHECK_GUARD; + if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG) + sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG; + if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG) + sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG; + + return 0; +} + +static int +isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn, + struct ib_cqe *cqe, struct ib_send_wr *chain_wr) +{ + struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd; + enum dma_data_direction dir = target_reverse_dma_direction(se_cmd); + u8 port_num = conn->cm_id->port_num; + u64 addr; + u32 rkey, offset; + int ret; + + if (cmd->ctx_init_done) + goto rdma_ctx_post; + + if (dir == DMA_FROM_DEVICE) { + addr = cmd->write_va; + rkey = cmd->write_stag; + offset = cmd->iscsi_cmd->write_data_done; + } else { + addr = cmd->read_va; + rkey = cmd->read_stag; + offset = 0; + } + + if (isert_prot_cmd(conn, se_cmd)) { + struct ib_sig_attrs sig_attrs; + + ret = isert_set_sig_attrs(se_cmd, &sig_attrs); + if (ret) + return ret; + + WARN_ON_ONCE(offset); + ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num, + se_cmd->t_data_sg, se_cmd->t_data_nents, + se_cmd->t_prot_sg, se_cmd->t_prot_nents, + &sig_attrs, addr, rkey, dir); + } else { + ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num, + se_cmd->t_data_sg, se_cmd->t_data_nents, + offset, addr, rkey, dir); + } + + if (ret < 0) { + isert_err("Cmd: %p failed to prepare RDMA res\n", cmd); + return ret; + } + + cmd->ctx_init_done = true; + +rdma_ctx_post: + ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr); + if (ret < 0) + isert_err("Cmd: %p failed to post RDMA res\n", cmd); + return ret; +} + +static int +isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_cqe *cqe = NULL; + struct ib_send_wr *chain_wr = NULL; + int rc; + + isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n", + isert_cmd, se_cmd->data_length); + + if (isert_prot_cmd(isert_conn, se_cmd)) { + isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done; + cqe = &isert_cmd->tx_desc.tx_cqe; + } else { + /* + * Build isert_conn->tx_desc for iSCSI response PDU and attach + */ + isert_create_send_desc(isert_conn, isert_cmd, + &isert_cmd->tx_desc); + iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *) + &isert_cmd->tx_desc.iscsi_header); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + isert_init_send_wr(isert_conn, isert_cmd, + &isert_cmd->tx_desc.send_wr); + + rc = isert_post_recv(isert_conn, isert_cmd->rx_desc); + if (rc) + return rc; + + chain_wr = &isert_cmd->tx_desc.send_wr; + } + + rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr); + isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n", + isert_cmd, rc); + return rc; +} + +static int +isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + int ret; + + isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", + isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done); + + isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done; + ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context, + &isert_cmd->tx_desc.tx_cqe, NULL); + + isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n", + isert_cmd, ret); + return ret; +} + +static int +isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + int ret = 0; + + switch (state) { + case ISTATE_REMOVE: + spin_lock_bh(&conn->cmd_lock); + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + isert_put_cmd(isert_cmd, true); + break; + case ISTATE_SEND_NOPIN_WANT_RESPONSE: + ret = isert_put_nopin(cmd, conn, false); + break; + default: + isert_err("Unknown immediate state: 0x%02x\n", state); + ret = -EINVAL; + break; + } + + return ret; +} + +static int +isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) +{ + struct isert_conn *isert_conn = conn->context; + int ret; + + switch (state) { + case ISTATE_SEND_LOGOUTRSP: + ret = isert_put_logout_rsp(cmd, conn); + if (!ret) + isert_conn->logout_posted = true; + break; + case ISTATE_SEND_NOPIN: + ret = isert_put_nopin(cmd, conn, true); + break; + case ISTATE_SEND_TASKMGTRSP: + ret = isert_put_tm_rsp(cmd, conn); + break; + case ISTATE_SEND_REJECT: + ret = isert_put_reject(cmd, conn); + break; + case ISTATE_SEND_TEXTRSP: + ret = isert_put_text_rsp(cmd, conn); + break; + case ISTATE_SEND_STATUS: + /* + * Special case for sending non GOOD SCSI status from TX thread + * context during pre se_cmd excecution failure. + */ + ret = isert_put_response(conn, cmd); + break; + default: + isert_err("Unknown response state: 0x%02x\n", state); + ret = -EINVAL; + break; + } + + return ret; +} + +struct rdma_cm_id * +isert_setup_id(struct isert_np *isert_np) +{ + struct iscsi_np *np = isert_np->np; + struct rdma_cm_id *id; + struct sockaddr *sa; + int ret; + + sa = (struct sockaddr *)&np->np_sockaddr; + isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa); + + id = rdma_create_id(&init_net, isert_cma_handler, isert_np, + RDMA_PS_TCP, IB_QPT_RC); + if (IS_ERR(id)) { + isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id)); + ret = PTR_ERR(id); + goto out; + } + isert_dbg("id %p context %p\n", id, id->context); + + ret = rdma_bind_addr(id, sa); + if (ret) { + isert_err("rdma_bind_addr() failed: %d\n", ret); + goto out_id; + } + + ret = rdma_listen(id, 0); + if (ret) { + isert_err("rdma_listen() failed: %d\n", ret); + goto out_id; + } + + return id; +out_id: + rdma_destroy_id(id); +out: + return ERR_PTR(ret); +} + +static int +isert_setup_np(struct iscsi_np *np, + struct sockaddr_storage *ksockaddr) +{ + struct isert_np *isert_np; + struct rdma_cm_id *isert_lid; + int ret; + + isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL); + if (!isert_np) + return -ENOMEM; + + sema_init(&isert_np->sem, 0); + mutex_init(&isert_np->mutex); + INIT_LIST_HEAD(&isert_np->accepted); + INIT_LIST_HEAD(&isert_np->pending); + isert_np->np = np; + + /* + * Setup the np->np_sockaddr from the passed sockaddr setup + * in iscsi_target_configfs.c code.. + */ + memcpy(&np->np_sockaddr, ksockaddr, + sizeof(struct sockaddr_storage)); + + isert_lid = isert_setup_id(isert_np); + if (IS_ERR(isert_lid)) { + ret = PTR_ERR(isert_lid); + goto out; + } + + isert_np->cm_id = isert_lid; + np->np_context = isert_np; + + return 0; + +out: + kfree(isert_np); + + return ret; +} + +static int +isert_rdma_accept(struct isert_conn *isert_conn) +{ + struct rdma_cm_id *cm_id = isert_conn->cm_id; + struct rdma_conn_param cp; + int ret; + struct iser_cm_hdr rsp_hdr; + + memset(&cp, 0, sizeof(struct rdma_conn_param)); + cp.initiator_depth = isert_conn->initiator_depth; + cp.retry_count = 7; + cp.rnr_retry_count = 7; + + memset(&rsp_hdr, 0, sizeof(rsp_hdr)); + rsp_hdr.flags = ISERT_ZBVA_NOT_USED; + if (!isert_conn->snd_w_inv) + rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED; + cp.private_data = (void *)&rsp_hdr; + cp.private_data_len = sizeof(rsp_hdr); + + ret = rdma_accept(cm_id, &cp); + if (ret) { + isert_err("rdma_accept() failed with: %d\n", ret); + return ret; + } + + return 0; +} + +static int +isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) +{ + struct isert_conn *isert_conn = conn->context; + int ret; + + isert_info("before login_req comp conn: %p\n", isert_conn); + ret = wait_for_completion_interruptible(&isert_conn->login_req_comp); + if (ret) { + isert_err("isert_conn %p interrupted before got login req\n", + isert_conn); + return ret; + } + reinit_completion(&isert_conn->login_req_comp); + + /* + * For login requests after the first PDU, isert_rx_login_req() will + * kick schedule_delayed_work(&conn->login_work) as the packet is + * received, which turns this callback from iscsi_target_do_login_rx() + * into a NOP. + */ + if (!login->first_request) + return 0; + + isert_rx_login_req(isert_conn); + + isert_info("before login_comp conn: %p\n", conn); + ret = wait_for_completion_interruptible(&isert_conn->login_comp); + if (ret) + return ret; + + isert_info("processing login->req: %p\n", login->req); + + return 0; +} + +static void +isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn, + struct isert_conn *isert_conn) +{ + struct rdma_cm_id *cm_id = isert_conn->cm_id; + struct rdma_route *cm_route = &cm_id->route; + + conn->login_family = np->np_sockaddr.ss_family; + + conn->login_sockaddr = cm_route->addr.dst_addr; + conn->local_sockaddr = cm_route->addr.src_addr; +} + +static int +isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) +{ + struct isert_np *isert_np = np->np_context; + struct isert_conn *isert_conn; + int ret; + +accept_wait: + ret = down_interruptible(&isert_np->sem); + if (ret) + return -ENODEV; + + spin_lock_bh(&np->np_thread_lock); + if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) { + spin_unlock_bh(&np->np_thread_lock); + isert_dbg("np_thread_state %d\n", + np->np_thread_state); + /** + * No point in stalling here when np_thread + * is in state RESET/SHUTDOWN/EXIT - bail + **/ + return -ENODEV; + } + spin_unlock_bh(&np->np_thread_lock); + + mutex_lock(&isert_np->mutex); + if (list_empty(&isert_np->pending)) { + mutex_unlock(&isert_np->mutex); + goto accept_wait; + } + isert_conn = list_first_entry(&isert_np->pending, + struct isert_conn, node); + list_del_init(&isert_conn->node); + mutex_unlock(&isert_np->mutex); + + conn->context = isert_conn; + isert_conn->conn = conn; + isert_conn->state = ISER_CONN_BOUND; + + isert_set_conn_info(np, conn, isert_conn); + + isert_dbg("Processing isert_conn: %p\n", isert_conn); + + return 0; +} + +static void +isert_free_np(struct iscsi_np *np) +{ + struct isert_np *isert_np = np->np_context; + struct isert_conn *isert_conn, *n; + LIST_HEAD(drop_conn_list); + + 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); + list_move_tail(&isert_conn->node, &drop_conn_list); + } + } + + 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); + list_move_tail(&isert_conn->node, &drop_conn_list); + } + } + mutex_unlock(&isert_np->mutex); + + list_for_each_entry_safe(isert_conn, n, &drop_conn_list, node) { + list_del_init(&isert_conn->node); + isert_connect_release(isert_conn); + } + + np->np_context = NULL; + kfree(isert_np); +} + +static void isert_release_work(struct work_struct *work) +{ + struct isert_conn *isert_conn = container_of(work, + struct isert_conn, + release_work); + + isert_info("Starting release conn %p\n", isert_conn); + + mutex_lock(&isert_conn->mutex); + isert_conn->state = ISER_CONN_DOWN; + mutex_unlock(&isert_conn->mutex); + + isert_info("Destroying conn %p\n", isert_conn); + isert_put_conn(isert_conn); +} + +static void +isert_wait4logout(struct isert_conn *isert_conn) +{ + struct iscsi_conn *conn = isert_conn->conn; + + isert_info("conn %p\n", isert_conn); + + if (isert_conn->logout_posted) { + isert_info("conn %p wait for conn_logout_comp\n", isert_conn); + wait_for_completion_timeout(&conn->conn_logout_comp, + SECONDS_FOR_LOGOUT_COMP * HZ); + } +} + +static void +isert_wait4cmds(struct iscsi_conn *conn) +{ + isert_info("iscsi_conn %p\n", conn); + + if (conn->sess) { + target_sess_cmd_list_set_waiting(conn->sess->se_sess); + target_wait_for_sess_cmds(conn->sess->se_sess); + } +} + +/** + * isert_put_unsol_pending_cmds() - Drop commands waiting for + * unsolicitate dataout + * @conn: iscsi connection + * + * We might still have commands that are waiting for unsolicited + * dataouts messages. We must put the extra reference on those + * before blocking on the target_wait_for_session_cmds + */ +static void +isert_put_unsol_pending_cmds(struct iscsi_conn *conn) +{ + struct iscsi_cmd *cmd, *tmp; + static LIST_HEAD(drop_cmd_list); + + spin_lock_bh(&conn->cmd_lock); + list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) { + if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) && + (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) && + (cmd->write_data_done < cmd->se_cmd.data_length)) + list_move_tail(&cmd->i_conn_node, &drop_cmd_list); + } + spin_unlock_bh(&conn->cmd_lock); + + list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) { + list_del_init(&cmd->i_conn_node); + if (cmd->i_state != ISTATE_REMOVE) { + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + + isert_info("conn %p dropping cmd %p\n", conn, cmd); + isert_put_cmd(isert_cmd, true); + } + } +} + +static void isert_wait_conn(struct iscsi_conn *conn) +{ + struct isert_conn *isert_conn = conn->context; + + isert_info("Starting conn %p\n", isert_conn); + + mutex_lock(&isert_conn->mutex); + isert_conn_terminate(isert_conn); + mutex_unlock(&isert_conn->mutex); + + ib_drain_qp(isert_conn->qp); + isert_put_unsol_pending_cmds(conn); + isert_wait4cmds(conn); + isert_wait4logout(isert_conn); + + queue_work(isert_release_wq, &isert_conn->release_work); +} + +static void isert_free_conn(struct iscsi_conn *conn) +{ + struct isert_conn *isert_conn = conn->context; + + ib_drain_qp(isert_conn->qp); + isert_put_conn(isert_conn); +} + +static void isert_get_rx_pdu(struct iscsi_conn *conn) +{ + struct completion comp; + + init_completion(&comp); + + wait_for_completion_interruptible(&comp); +} + +static struct iscsit_transport iser_target_transport = { + .name = "IB/iSER", + .transport_type = ISCSI_INFINIBAND, + .rdma_shutdown = true, + .priv_size = sizeof(struct isert_cmd), + .owner = THIS_MODULE, + .iscsit_setup_np = isert_setup_np, + .iscsit_accept_np = isert_accept_np, + .iscsit_free_np = isert_free_np, + .iscsit_wait_conn = isert_wait_conn, + .iscsit_free_conn = isert_free_conn, + .iscsit_get_login_rx = isert_get_login_rx, + .iscsit_put_login_tx = isert_put_login_tx, + .iscsit_immediate_queue = isert_immediate_queue, + .iscsit_response_queue = isert_response_queue, + .iscsit_get_dataout = isert_get_dataout, + .iscsit_queue_data_in = isert_put_datain, + .iscsit_queue_status = isert_put_response, + .iscsit_aborted_task = isert_aborted_task, + .iscsit_get_rx_pdu = isert_get_rx_pdu, + .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops, +}; + +static int __init isert_init(void) +{ + int ret; + + isert_comp_wq = alloc_workqueue("isert_comp_wq", + WQ_UNBOUND | WQ_HIGHPRI, 0); + if (!isert_comp_wq) { + isert_err("Unable to allocate isert_comp_wq\n"); + return -ENOMEM; + } + + isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND, + WQ_UNBOUND_MAX_ACTIVE); + if (!isert_release_wq) { + isert_err("Unable to allocate isert_release_wq\n"); + ret = -ENOMEM; + goto destroy_comp_wq; + } + + iscsit_register_transport(&iser_target_transport); + isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n"); + + return 0; + +destroy_comp_wq: + destroy_workqueue(isert_comp_wq); + + return ret; +} + +static void __exit isert_exit(void) +{ + flush_scheduled_work(); + destroy_workqueue(isert_release_wq); + destroy_workqueue(isert_comp_wq); + iscsit_unregister_transport(&iser_target_transport); + isert_info("iSER_TARGET[0] - Released iser_target_transport\n"); +} + +MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure"); +MODULE_AUTHOR("nab@Linux-iSCSI.org"); +MODULE_LICENSE("GPL"); + +module_init(isert_init); +module_exit(isert_exit); |