| /* |
| * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. |
| * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| |
| #include "iscsi_iser.h" |
| |
| #define ISCSI_ISER_MAX_CONN 8 |
| #define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) |
| #define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) |
| |
| static void iser_cq_tasklet_fn(unsigned long data); |
| static void iser_cq_callback(struct ib_cq *cq, void *cq_context); |
| |
| static void iser_cq_event_callback(struct ib_event *cause, void *context) |
| { |
| iser_err("got cq event %d \n", cause->event); |
| } |
| |
| static void iser_qp_event_callback(struct ib_event *cause, void *context) |
| { |
| iser_err("got qp event %d\n",cause->event); |
| } |
| |
| /** |
| * iser_create_device_ib_res - creates Protection Domain (PD), Completion |
| * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with |
| * the adapator. |
| * |
| * returns 0 on success, -1 on failure |
| */ |
| static int iser_create_device_ib_res(struct iser_device *device) |
| { |
| device->pd = ib_alloc_pd(device->ib_device); |
| if (IS_ERR(device->pd)) |
| goto pd_err; |
| |
| device->rx_cq = ib_create_cq(device->ib_device, |
| iser_cq_callback, |
| iser_cq_event_callback, |
| (void *)device, |
| ISER_MAX_RX_CQ_LEN, 0); |
| if (IS_ERR(device->rx_cq)) |
| goto rx_cq_err; |
| |
| device->tx_cq = ib_create_cq(device->ib_device, |
| NULL, iser_cq_event_callback, |
| (void *)device, |
| ISER_MAX_TX_CQ_LEN, 0); |
| |
| if (IS_ERR(device->tx_cq)) |
| goto tx_cq_err; |
| |
| if (ib_req_notify_cq(device->rx_cq, IB_CQ_NEXT_COMP)) |
| goto cq_arm_err; |
| |
| tasklet_init(&device->cq_tasklet, |
| iser_cq_tasklet_fn, |
| (unsigned long)device); |
| |
| device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | |
| IB_ACCESS_REMOTE_WRITE | |
| IB_ACCESS_REMOTE_READ); |
| if (IS_ERR(device->mr)) |
| goto dma_mr_err; |
| |
| return 0; |
| |
| dma_mr_err: |
| tasklet_kill(&device->cq_tasklet); |
| cq_arm_err: |
| ib_destroy_cq(device->tx_cq); |
| tx_cq_err: |
| ib_destroy_cq(device->rx_cq); |
| rx_cq_err: |
| ib_dealloc_pd(device->pd); |
| pd_err: |
| iser_err("failed to allocate an IB resource\n"); |
| return -1; |
| } |
| |
| /** |
| * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, |
| * CQ and PD created with the device associated with the adapator. |
| */ |
| static void iser_free_device_ib_res(struct iser_device *device) |
| { |
| BUG_ON(device->mr == NULL); |
| |
| tasklet_kill(&device->cq_tasklet); |
| |
| (void)ib_dereg_mr(device->mr); |
| (void)ib_destroy_cq(device->tx_cq); |
| (void)ib_destroy_cq(device->rx_cq); |
| (void)ib_dealloc_pd(device->pd); |
| |
| device->mr = NULL; |
| device->tx_cq = NULL; |
| device->rx_cq = NULL; |
| device->pd = NULL; |
| } |
| |
| /** |
| * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) |
| * |
| * returns 0 on success, -1 on failure |
| */ |
| static int iser_create_ib_conn_res(struct iser_conn *ib_conn) |
| { |
| struct iser_device *device; |
| struct ib_qp_init_attr init_attr; |
| int ret = -ENOMEM; |
| struct ib_fmr_pool_param params; |
| |
| BUG_ON(ib_conn->device == NULL); |
| |
| device = ib_conn->device; |
| |
| ib_conn->login_buf = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); |
| if (!ib_conn->login_buf) { |
| goto alloc_err; |
| ret = -ENOMEM; |
| } |
| |
| ib_conn->login_dma = ib_dma_map_single(ib_conn->device->ib_device, |
| (void *)ib_conn->login_buf, ISER_RX_LOGIN_SIZE, |
| DMA_FROM_DEVICE); |
| |
| ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + |
| (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), |
| GFP_KERNEL); |
| if (!ib_conn->page_vec) { |
| ret = -ENOMEM; |
| goto alloc_err; |
| } |
| ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); |
| |
| params.page_shift = SHIFT_4K; |
| /* when the first/last SG element are not start/end * |
| * page aligned, the map whould be of N+1 pages */ |
| params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; |
| /* make the pool size twice the max number of SCSI commands * |
| * the ML is expected to queue, watermark for unmap at 50% */ |
| params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; |
| params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; |
| params.cache = 0; |
| params.flush_function = NULL; |
| params.access = (IB_ACCESS_LOCAL_WRITE | |
| IB_ACCESS_REMOTE_WRITE | |
| IB_ACCESS_REMOTE_READ); |
| |
| ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); |
| if (IS_ERR(ib_conn->fmr_pool)) { |
| ret = PTR_ERR(ib_conn->fmr_pool); |
| goto fmr_pool_err; |
| } |
| |
| memset(&init_attr, 0, sizeof init_attr); |
| |
| init_attr.event_handler = iser_qp_event_callback; |
| init_attr.qp_context = (void *)ib_conn; |
| init_attr.send_cq = device->tx_cq; |
| init_attr.recv_cq = device->rx_cq; |
| init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; |
| init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; |
| init_attr.cap.max_send_sge = 2; |
| init_attr.cap.max_recv_sge = 1; |
| init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| init_attr.qp_type = IB_QPT_RC; |
| |
| ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); |
| if (ret) |
| goto qp_err; |
| |
| ib_conn->qp = ib_conn->cma_id->qp; |
| iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", |
| ib_conn, ib_conn->cma_id, |
| ib_conn->fmr_pool, ib_conn->cma_id->qp); |
| return ret; |
| |
| qp_err: |
| (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); |
| fmr_pool_err: |
| kfree(ib_conn->page_vec); |
| kfree(ib_conn->login_buf); |
| alloc_err: |
| iser_err("unable to alloc mem or create resource, err %d\n", ret); |
| return ret; |
| } |
| |
| /** |
| * releases the FMR pool, QP and CMA ID objects, returns 0 on success, |
| * -1 on failure |
| */ |
| static int iser_free_ib_conn_res(struct iser_conn *ib_conn) |
| { |
| BUG_ON(ib_conn == NULL); |
| |
| iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", |
| ib_conn, ib_conn->cma_id, |
| ib_conn->fmr_pool, ib_conn->qp); |
| |
| /* qp is created only once both addr & route are resolved */ |
| if (ib_conn->fmr_pool != NULL) |
| ib_destroy_fmr_pool(ib_conn->fmr_pool); |
| |
| if (ib_conn->qp != NULL) |
| rdma_destroy_qp(ib_conn->cma_id); |
| |
| if (ib_conn->cma_id != NULL) |
| rdma_destroy_id(ib_conn->cma_id); |
| |
| ib_conn->fmr_pool = NULL; |
| ib_conn->qp = NULL; |
| ib_conn->cma_id = NULL; |
| kfree(ib_conn->page_vec); |
| |
| return 0; |
| } |
| |
| /** |
| * based on the resolved device node GUID see if there already allocated |
| * device for this device. If there's no such, create one. |
| */ |
| static |
| struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) |
| { |
| struct iser_device *device; |
| |
| mutex_lock(&ig.device_list_mutex); |
| |
| list_for_each_entry(device, &ig.device_list, ig_list) |
| /* find if there's a match using the node GUID */ |
| if (device->ib_device->node_guid == cma_id->device->node_guid) |
| goto inc_refcnt; |
| |
| device = kzalloc(sizeof *device, GFP_KERNEL); |
| if (device == NULL) |
| goto out; |
| |
| /* assign this device to the device */ |
| device->ib_device = cma_id->device; |
| /* init the device and link it into ig device list */ |
| if (iser_create_device_ib_res(device)) { |
| kfree(device); |
| device = NULL; |
| goto out; |
| } |
| list_add(&device->ig_list, &ig.device_list); |
| |
| inc_refcnt: |
| device->refcount++; |
| out: |
| mutex_unlock(&ig.device_list_mutex); |
| return device; |
| } |
| |
| /* if there's no demand for this device, release it */ |
| static void iser_device_try_release(struct iser_device *device) |
| { |
| mutex_lock(&ig.device_list_mutex); |
| device->refcount--; |
| iser_err("device %p refcount %d\n",device,device->refcount); |
| if (!device->refcount) { |
| iser_free_device_ib_res(device); |
| list_del(&device->ig_list); |
| kfree(device); |
| } |
| mutex_unlock(&ig.device_list_mutex); |
| } |
| |
| int iser_conn_state_comp(struct iser_conn *ib_conn, |
| enum iser_ib_conn_state comp) |
| { |
| int ret; |
| |
| spin_lock_bh(&ib_conn->lock); |
| ret = (ib_conn->state == comp); |
| spin_unlock_bh(&ib_conn->lock); |
| return ret; |
| } |
| |
| static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, |
| enum iser_ib_conn_state comp, |
| enum iser_ib_conn_state exch) |
| { |
| int ret; |
| |
| spin_lock_bh(&ib_conn->lock); |
| if ((ret = (ib_conn->state == comp))) |
| ib_conn->state = exch; |
| spin_unlock_bh(&ib_conn->lock); |
| return ret; |
| } |
| |
| /** |
| * Frees all conn objects and deallocs conn descriptor |
| */ |
| static void iser_conn_release(struct iser_conn *ib_conn) |
| { |
| struct iser_device *device = ib_conn->device; |
| |
| BUG_ON(ib_conn->state != ISER_CONN_DOWN); |
| |
| mutex_lock(&ig.connlist_mutex); |
| list_del(&ib_conn->conn_list); |
| mutex_unlock(&ig.connlist_mutex); |
| iser_free_rx_descriptors(ib_conn); |
| iser_free_ib_conn_res(ib_conn); |
| ib_conn->device = NULL; |
| /* on EVENT_ADDR_ERROR there's no device yet for this conn */ |
| if (device != NULL) |
| iser_device_try_release(device); |
| if (ib_conn->iser_conn) |
| ib_conn->iser_conn->ib_conn = NULL; |
| iscsi_destroy_endpoint(ib_conn->ep); |
| } |
| |
| void iser_conn_get(struct iser_conn *ib_conn) |
| { |
| atomic_inc(&ib_conn->refcount); |
| } |
| |
| void iser_conn_put(struct iser_conn *ib_conn) |
| { |
| if (atomic_dec_and_test(&ib_conn->refcount)) |
| iser_conn_release(ib_conn); |
| } |
| |
| /** |
| * triggers start of the disconnect procedures and wait for them to be done |
| */ |
| void iser_conn_terminate(struct iser_conn *ib_conn) |
| { |
| int err = 0; |
| |
| /* change the ib conn state only if the conn is UP, however always call |
| * rdma_disconnect since this is the only way to cause the CMA to change |
| * the QP state to ERROR |
| */ |
| |
| iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); |
| err = rdma_disconnect(ib_conn->cma_id); |
| if (err) |
| iser_err("Failed to disconnect, conn: 0x%p err %d\n", |
| ib_conn,err); |
| |
| wait_event_interruptible(ib_conn->wait, |
| ib_conn->state == ISER_CONN_DOWN); |
| |
| iser_conn_put(ib_conn); |
| } |
| |
| static void iser_connect_error(struct rdma_cm_id *cma_id) |
| { |
| struct iser_conn *ib_conn; |
| ib_conn = (struct iser_conn *)cma_id->context; |
| |
| ib_conn->state = ISER_CONN_DOWN; |
| wake_up_interruptible(&ib_conn->wait); |
| } |
| |
| static void iser_addr_handler(struct rdma_cm_id *cma_id) |
| { |
| struct iser_device *device; |
| struct iser_conn *ib_conn; |
| int ret; |
| |
| device = iser_device_find_by_ib_device(cma_id); |
| if (!device) { |
| iser_err("device lookup/creation failed\n"); |
| iser_connect_error(cma_id); |
| return; |
| } |
| |
| ib_conn = (struct iser_conn *)cma_id->context; |
| ib_conn->device = device; |
| |
| ret = rdma_resolve_route(cma_id, 1000); |
| if (ret) { |
| iser_err("resolve route failed: %d\n", ret); |
| iser_connect_error(cma_id); |
| } |
| } |
| |
| static void iser_route_handler(struct rdma_cm_id *cma_id) |
| { |
| struct rdma_conn_param conn_param; |
| int ret; |
| |
| ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); |
| if (ret) |
| goto failure; |
| |
| memset(&conn_param, 0, sizeof conn_param); |
| conn_param.responder_resources = 4; |
| conn_param.initiator_depth = 1; |
| conn_param.retry_count = 7; |
| conn_param.rnr_retry_count = 6; |
| |
| ret = rdma_connect(cma_id, &conn_param); |
| if (ret) { |
| iser_err("failure connecting: %d\n", ret); |
| goto failure; |
| } |
| |
| return; |
| failure: |
| iser_connect_error(cma_id); |
| } |
| |
| static void iser_connected_handler(struct rdma_cm_id *cma_id) |
| { |
| struct iser_conn *ib_conn; |
| |
| ib_conn = (struct iser_conn *)cma_id->context; |
| ib_conn->state = ISER_CONN_UP; |
| wake_up_interruptible(&ib_conn->wait); |
| } |
| |
| static void iser_disconnected_handler(struct rdma_cm_id *cma_id) |
| { |
| struct iser_conn *ib_conn; |
| |
| ib_conn = (struct iser_conn *)cma_id->context; |
| ib_conn->disc_evt_flag = 1; |
| |
| /* getting here when the state is UP means that the conn is being * |
| * terminated asynchronously from the iSCSI layer's perspective. */ |
| if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, |
| ISER_CONN_TERMINATING)) |
| iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, |
| ISCSI_ERR_CONN_FAILED); |
| |
| /* Complete the termination process if no posts are pending */ |
| if (ib_conn->post_recv_buf_count == 0 && |
| (atomic_read(&ib_conn->post_send_buf_count) == 0)) { |
| ib_conn->state = ISER_CONN_DOWN; |
| wake_up_interruptible(&ib_conn->wait); |
| } |
| } |
| |
| static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) |
| { |
| int ret = 0; |
| |
| iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id); |
| |
| switch (event->event) { |
| case RDMA_CM_EVENT_ADDR_RESOLVED: |
| iser_addr_handler(cma_id); |
| break; |
| case RDMA_CM_EVENT_ROUTE_RESOLVED: |
| iser_route_handler(cma_id); |
| break; |
| case RDMA_CM_EVENT_ESTABLISHED: |
| iser_connected_handler(cma_id); |
| break; |
| case RDMA_CM_EVENT_ADDR_ERROR: |
| case RDMA_CM_EVENT_ROUTE_ERROR: |
| case RDMA_CM_EVENT_CONNECT_ERROR: |
| case RDMA_CM_EVENT_UNREACHABLE: |
| case RDMA_CM_EVENT_REJECTED: |
| iser_err("event: %d, error: %d\n", event->event, event->status); |
| iser_connect_error(cma_id); |
| break; |
| case RDMA_CM_EVENT_DISCONNECTED: |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| case RDMA_CM_EVENT_ADDR_CHANGE: |
| iser_disconnected_handler(cma_id); |
| break; |
| default: |
| iser_err("Unexpected RDMA CM event (%d)\n", event->event); |
| break; |
| } |
| return ret; |
| } |
| |
| void iser_conn_init(struct iser_conn *ib_conn) |
| { |
| ib_conn->state = ISER_CONN_INIT; |
| init_waitqueue_head(&ib_conn->wait); |
| ib_conn->post_recv_buf_count = 0; |
| atomic_set(&ib_conn->post_send_buf_count, 0); |
| atomic_set(&ib_conn->refcount, 1); |
| INIT_LIST_HEAD(&ib_conn->conn_list); |
| spin_lock_init(&ib_conn->lock); |
| } |
| |
| /** |
| * starts the process of connecting to the target |
| * sleeps until the connection is established or rejected |
| */ |
| int iser_connect(struct iser_conn *ib_conn, |
| struct sockaddr_in *src_addr, |
| struct sockaddr_in *dst_addr, |
| int non_blocking) |
| { |
| struct sockaddr *src, *dst; |
| int err = 0; |
| |
| sprintf(ib_conn->name, "%pI4:%d", |
| &dst_addr->sin_addr.s_addr, dst_addr->sin_port); |
| |
| /* the device is known only --after-- address resolution */ |
| ib_conn->device = NULL; |
| |
| iser_err("connecting to: %pI4, port 0x%x\n", |
| &dst_addr->sin_addr, dst_addr->sin_port); |
| |
| ib_conn->state = ISER_CONN_PENDING; |
| |
| ib_conn->cma_id = rdma_create_id(iser_cma_handler, |
| (void *)ib_conn, |
| RDMA_PS_TCP); |
| if (IS_ERR(ib_conn->cma_id)) { |
| err = PTR_ERR(ib_conn->cma_id); |
| iser_err("rdma_create_id failed: %d\n", err); |
| goto id_failure; |
| } |
| |
| src = (struct sockaddr *)src_addr; |
| dst = (struct sockaddr *)dst_addr; |
| err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); |
| if (err) { |
| iser_err("rdma_resolve_addr failed: %d\n", err); |
| goto addr_failure; |
| } |
| |
| if (!non_blocking) { |
| wait_event_interruptible(ib_conn->wait, |
| (ib_conn->state != ISER_CONN_PENDING)); |
| |
| if (ib_conn->state != ISER_CONN_UP) { |
| err = -EIO; |
| goto connect_failure; |
| } |
| } |
| |
| mutex_lock(&ig.connlist_mutex); |
| list_add(&ib_conn->conn_list, &ig.connlist); |
| mutex_unlock(&ig.connlist_mutex); |
| return 0; |
| |
| id_failure: |
| ib_conn->cma_id = NULL; |
| addr_failure: |
| ib_conn->state = ISER_CONN_DOWN; |
| connect_failure: |
| iser_conn_release(ib_conn); |
| return err; |
| } |
| |
| /** |
| * iser_reg_page_vec - Register physical memory |
| * |
| * returns: 0 on success, errno code on failure |
| */ |
| int iser_reg_page_vec(struct iser_conn *ib_conn, |
| struct iser_page_vec *page_vec, |
| struct iser_mem_reg *mem_reg) |
| { |
| struct ib_pool_fmr *mem; |
| u64 io_addr; |
| u64 *page_list; |
| int status; |
| |
| page_list = page_vec->pages; |
| io_addr = page_list[0]; |
| |
| mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, |
| page_list, |
| page_vec->length, |
| io_addr); |
| |
| if (IS_ERR(mem)) { |
| status = (int)PTR_ERR(mem); |
| iser_err("ib_fmr_pool_map_phys failed: %d\n", status); |
| return status; |
| } |
| |
| mem_reg->lkey = mem->fmr->lkey; |
| mem_reg->rkey = mem->fmr->rkey; |
| mem_reg->len = page_vec->length * SIZE_4K; |
| mem_reg->va = io_addr; |
| mem_reg->is_fmr = 1; |
| mem_reg->mem_h = (void *)mem; |
| |
| mem_reg->va += page_vec->offset; |
| mem_reg->len = page_vec->data_size; |
| |
| iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " |
| "entry[0]: (0x%08lx,%ld)] -> " |
| "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", |
| page_vec, page_vec->length, |
| (unsigned long)page_vec->pages[0], |
| (unsigned long)page_vec->data_size, |
| (unsigned int)mem_reg->lkey, mem_reg->mem_h, |
| (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); |
| return 0; |
| } |
| |
| /** |
| * Unregister (previosuly registered) memory. |
| */ |
| void iser_unreg_mem(struct iser_mem_reg *reg) |
| { |
| int ret; |
| |
| iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); |
| |
| ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); |
| if (ret) |
| iser_err("ib_fmr_pool_unmap failed %d\n", ret); |
| |
| reg->mem_h = NULL; |
| } |
| |
| int iser_post_recvl(struct iser_conn *ib_conn) |
| { |
| struct ib_recv_wr rx_wr, *rx_wr_failed; |
| struct ib_sge sge; |
| int ib_ret; |
| |
| sge.addr = ib_conn->login_dma; |
| sge.length = ISER_RX_LOGIN_SIZE; |
| sge.lkey = ib_conn->device->mr->lkey; |
| |
| rx_wr.wr_id = (unsigned long)ib_conn->login_buf; |
| rx_wr.sg_list = &sge; |
| rx_wr.num_sge = 1; |
| rx_wr.next = NULL; |
| |
| ib_conn->post_recv_buf_count++; |
| ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); |
| if (ib_ret) { |
| iser_err("ib_post_recv failed ret=%d\n", ib_ret); |
| ib_conn->post_recv_buf_count--; |
| } |
| return ib_ret; |
| } |
| |
| int iser_post_recvm(struct iser_conn *ib_conn, int count) |
| { |
| struct ib_recv_wr *rx_wr, *rx_wr_failed; |
| int i, ib_ret; |
| unsigned int my_rx_head = ib_conn->rx_desc_head; |
| struct iser_rx_desc *rx_desc; |
| |
| for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { |
| rx_desc = &ib_conn->rx_descs[my_rx_head]; |
| rx_wr->wr_id = (unsigned long)rx_desc; |
| rx_wr->sg_list = &rx_desc->rx_sg; |
| rx_wr->num_sge = 1; |
| rx_wr->next = rx_wr + 1; |
| my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1); |
| } |
| |
| rx_wr--; |
| rx_wr->next = NULL; /* mark end of work requests list */ |
| |
| ib_conn->post_recv_buf_count += count; |
| ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); |
| if (ib_ret) { |
| iser_err("ib_post_recv failed ret=%d\n", ib_ret); |
| ib_conn->post_recv_buf_count -= count; |
| } else |
| ib_conn->rx_desc_head = my_rx_head; |
| return ib_ret; |
| } |
| |
| |
| /** |
| * iser_start_send - Initiate a Send DTO operation |
| * |
| * returns 0 on success, -1 on failure |
| */ |
| int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) |
| { |
| int ib_ret; |
| struct ib_send_wr send_wr, *send_wr_failed; |
| |
| ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
| tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); |
| |
| send_wr.next = NULL; |
| send_wr.wr_id = (unsigned long)tx_desc; |
| send_wr.sg_list = tx_desc->tx_sg; |
| send_wr.num_sge = tx_desc->num_sge; |
| send_wr.opcode = IB_WR_SEND; |
| send_wr.send_flags = IB_SEND_SIGNALED; |
| |
| atomic_inc(&ib_conn->post_send_buf_count); |
| |
| ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); |
| if (ib_ret) { |
| iser_err("ib_post_send failed, ret:%d\n", ib_ret); |
| atomic_dec(&ib_conn->post_send_buf_count); |
| } |
| return ib_ret; |
| } |
| |
| static void iser_handle_comp_error(struct iser_tx_desc *desc, |
| struct iser_conn *ib_conn) |
| { |
| if (desc && desc->type == ISCSI_TX_DATAOUT) |
| kmem_cache_free(ig.desc_cache, desc); |
| |
| if (ib_conn->post_recv_buf_count == 0 && |
| atomic_read(&ib_conn->post_send_buf_count) == 0) { |
| /* getting here when the state is UP means that the conn is * |
| * being terminated asynchronously from the iSCSI layer's * |
| * perspective. */ |
| if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, |
| ISER_CONN_TERMINATING)) |
| iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, |
| ISCSI_ERR_CONN_FAILED); |
| |
| /* complete the termination process if disconnect event was delivered * |
| * note there are no more non completed posts to the QP */ |
| if (ib_conn->disc_evt_flag) { |
| ib_conn->state = ISER_CONN_DOWN; |
| wake_up_interruptible(&ib_conn->wait); |
| } |
| } |
| } |
| |
| static int iser_drain_tx_cq(struct iser_device *device) |
| { |
| struct ib_cq *cq = device->tx_cq; |
| struct ib_wc wc; |
| struct iser_tx_desc *tx_desc; |
| struct iser_conn *ib_conn; |
| int completed_tx = 0; |
| |
| while (ib_poll_cq(cq, 1, &wc) == 1) { |
| tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; |
| ib_conn = wc.qp->qp_context; |
| if (wc.status == IB_WC_SUCCESS) { |
| if (wc.opcode == IB_WC_SEND) |
| iser_snd_completion(tx_desc, ib_conn); |
| else |
| iser_err("expected opcode %d got %d\n", |
| IB_WC_SEND, wc.opcode); |
| } else { |
| iser_err("tx id %llx status %d vend_err %x\n", |
| wc.wr_id, wc.status, wc.vendor_err); |
| atomic_dec(&ib_conn->post_send_buf_count); |
| iser_handle_comp_error(tx_desc, ib_conn); |
| } |
| completed_tx++; |
| } |
| return completed_tx; |
| } |
| |
| |
| static void iser_cq_tasklet_fn(unsigned long data) |
| { |
| struct iser_device *device = (struct iser_device *)data; |
| struct ib_cq *cq = device->rx_cq; |
| struct ib_wc wc; |
| struct iser_rx_desc *desc; |
| unsigned long xfer_len; |
| struct iser_conn *ib_conn; |
| int completed_tx, completed_rx; |
| completed_tx = completed_rx = 0; |
| |
| while (ib_poll_cq(cq, 1, &wc) == 1) { |
| desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; |
| BUG_ON(desc == NULL); |
| ib_conn = wc.qp->qp_context; |
| if (wc.status == IB_WC_SUCCESS) { |
| if (wc.opcode == IB_WC_RECV) { |
| xfer_len = (unsigned long)wc.byte_len; |
| iser_rcv_completion(desc, xfer_len, ib_conn); |
| } else |
| iser_err("expected opcode %d got %d\n", |
| IB_WC_RECV, wc.opcode); |
| } else { |
| if (wc.status != IB_WC_WR_FLUSH_ERR) |
| iser_err("rx id %llx status %d vend_err %x\n", |
| wc.wr_id, wc.status, wc.vendor_err); |
| ib_conn->post_recv_buf_count--; |
| iser_handle_comp_error(NULL, ib_conn); |
| } |
| completed_rx++; |
| if (!(completed_rx & 63)) |
| completed_tx += iser_drain_tx_cq(device); |
| } |
| /* #warning "it is assumed here that arming CQ only once its empty" * |
| * " would not cause interrupts to be missed" */ |
| ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); |
| |
| completed_tx += iser_drain_tx_cq(device); |
| iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); |
| } |
| |
| static void iser_cq_callback(struct ib_cq *cq, void *cq_context) |
| { |
| struct iser_device *device = (struct iser_device *)cq_context; |
| |
| tasklet_schedule(&device->cq_tasklet); |
| } |