| /* |
| * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. |
| * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. |
| * Copyright (c) 2013-2014 Mellanox Technologies. 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/slab.h> |
| #include <linux/delay.h> |
| |
| #include "iscsi_iser.h" |
| |
| #define ISCSI_ISER_MAX_CONN 8 |
| #define ISER_MAX_RX_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) |
| #define ISER_MAX_TX_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) |
| #define ISER_MAX_CQ_LEN (ISER_MAX_RX_LEN + ISER_MAX_TX_LEN + \ |
| ISCSI_ISER_MAX_CONN) |
| |
| static int iser_cq_poll_limit = 512; |
| |
| 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); |
| } |
| |
| static void iser_event_handler(struct ib_event_handler *handler, |
| struct ib_event *event) |
| { |
| iser_err("async event %d on device %s port %d\n", event->event, |
| event->device->name, event->element.port_num); |
| } |
| |
| /** |
| * 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) |
| { |
| struct ib_device_attr *dev_attr = &device->dev_attr; |
| int ret, i, max_cqe; |
| |
| ret = ib_query_device(device->ib_device, dev_attr); |
| if (ret) { |
| pr_warn("Query device failed for %s\n", device->ib_device->name); |
| return ret; |
| } |
| |
| /* Assign function handles - based on FMR support */ |
| if (device->ib_device->alloc_fmr && device->ib_device->dealloc_fmr && |
| device->ib_device->map_phys_fmr && device->ib_device->unmap_fmr) { |
| iser_info("FMR supported, using FMR for registration\n"); |
| device->iser_alloc_rdma_reg_res = iser_create_fmr_pool; |
| device->iser_free_rdma_reg_res = iser_free_fmr_pool; |
| device->iser_reg_rdma_mem = iser_reg_rdma_mem_fmr; |
| device->iser_unreg_rdma_mem = iser_unreg_mem_fmr; |
| } else |
| if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { |
| iser_info("FastReg supported, using FastReg for registration\n"); |
| device->iser_alloc_rdma_reg_res = iser_create_fastreg_pool; |
| device->iser_free_rdma_reg_res = iser_free_fastreg_pool; |
| device->iser_reg_rdma_mem = iser_reg_rdma_mem_fastreg; |
| device->iser_unreg_rdma_mem = iser_unreg_mem_fastreg; |
| } else { |
| iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n"); |
| return -1; |
| } |
| |
| device->comps_used = min_t(int, num_online_cpus(), |
| device->ib_device->num_comp_vectors); |
| |
| device->comps = kcalloc(device->comps_used, sizeof(*device->comps), |
| GFP_KERNEL); |
| if (!device->comps) |
| goto comps_err; |
| |
| max_cqe = min(ISER_MAX_CQ_LEN, dev_attr->max_cqe); |
| |
| iser_info("using %d CQs, device %s supports %d vectors max_cqe %d\n", |
| device->comps_used, device->ib_device->name, |
| device->ib_device->num_comp_vectors, max_cqe); |
| |
| device->pd = ib_alloc_pd(device->ib_device); |
| if (IS_ERR(device->pd)) |
| goto pd_err; |
| |
| for (i = 0; i < device->comps_used; i++) { |
| struct iser_comp *comp = &device->comps[i]; |
| |
| comp->device = device; |
| comp->cq = ib_create_cq(device->ib_device, |
| iser_cq_callback, |
| iser_cq_event_callback, |
| (void *)comp, |
| max_cqe, i); |
| if (IS_ERR(comp->cq)) { |
| comp->cq = NULL; |
| goto cq_err; |
| } |
| |
| if (ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP)) |
| goto cq_err; |
| |
| tasklet_init(&comp->tasklet, iser_cq_tasklet_fn, |
| (unsigned long)comp); |
| } |
| |
| 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; |
| |
| INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device, |
| iser_event_handler); |
| if (ib_register_event_handler(&device->event_handler)) |
| goto handler_err; |
| |
| return 0; |
| |
| handler_err: |
| ib_dereg_mr(device->mr); |
| dma_mr_err: |
| for (i = 0; i < device->comps_used; i++) |
| tasklet_kill(&device->comps[i].tasklet); |
| cq_err: |
| for (i = 0; i < device->comps_used; i++) { |
| struct iser_comp *comp = &device->comps[i]; |
| |
| if (comp->cq) |
| ib_destroy_cq(comp->cq); |
| } |
| ib_dealloc_pd(device->pd); |
| pd_err: |
| kfree(device->comps); |
| comps_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) |
| { |
| int i; |
| BUG_ON(device->mr == NULL); |
| |
| for (i = 0; i < device->comps_used; i++) { |
| struct iser_comp *comp = &device->comps[i]; |
| |
| tasklet_kill(&comp->tasklet); |
| ib_destroy_cq(comp->cq); |
| comp->cq = NULL; |
| } |
| |
| (void)ib_unregister_event_handler(&device->event_handler); |
| (void)ib_dereg_mr(device->mr); |
| (void)ib_dealloc_pd(device->pd); |
| |
| kfree(device->comps); |
| device->comps = NULL; |
| |
| device->mr = NULL; |
| device->pd = NULL; |
| } |
| |
| /** |
| * iser_create_fmr_pool - Creates FMR pool and page_vector |
| * |
| * returns 0 on success, or errno code on failure |
| */ |
| int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max) |
| { |
| struct iser_device *device = ib_conn->device; |
| struct ib_fmr_pool_param params; |
| int ret = -ENOMEM; |
| |
| ib_conn->fmr.page_vec = kmalloc(sizeof(*ib_conn->fmr.page_vec) + |
| (sizeof(u64)*(ISCSI_ISER_SG_TABLESIZE + 1)), |
| GFP_KERNEL); |
| if (!ib_conn->fmr.page_vec) |
| return ret; |
| |
| ib_conn->fmr.page_vec->pages = (u64 *)(ib_conn->fmr.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 = cmds_max * 2; |
| params.dirty_watermark = 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)) |
| return 0; |
| |
| /* no FMR => no need for page_vec */ |
| kfree(ib_conn->fmr.page_vec); |
| ib_conn->fmr.page_vec = NULL; |
| |
| ret = PTR_ERR(ib_conn->fmr.pool); |
| ib_conn->fmr.pool = NULL; |
| if (ret != -ENOSYS) { |
| iser_err("FMR allocation failed, err %d\n", ret); |
| return ret; |
| } else { |
| iser_warn("FMRs are not supported, using unaligned mode\n"); |
| return 0; |
| } |
| } |
| |
| /** |
| * iser_free_fmr_pool - releases the FMR pool and page vec |
| */ |
| void iser_free_fmr_pool(struct ib_conn *ib_conn) |
| { |
| iser_info("freeing conn %p fmr pool %p\n", |
| ib_conn, ib_conn->fmr.pool); |
| |
| if (ib_conn->fmr.pool != NULL) |
| ib_destroy_fmr_pool(ib_conn->fmr.pool); |
| |
| ib_conn->fmr.pool = NULL; |
| |
| kfree(ib_conn->fmr.page_vec); |
| ib_conn->fmr.page_vec = NULL; |
| } |
| |
| static int |
| iser_create_fastreg_desc(struct ib_device *ib_device, struct ib_pd *pd, |
| bool pi_enable, struct fast_reg_descriptor *desc) |
| { |
| int ret; |
| |
| desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device, |
| ISCSI_ISER_SG_TABLESIZE + 1); |
| if (IS_ERR(desc->data_frpl)) { |
| ret = PTR_ERR(desc->data_frpl); |
| iser_err("Failed to allocate ib_fast_reg_page_list err=%d\n", |
| ret); |
| return PTR_ERR(desc->data_frpl); |
| } |
| |
| desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE + 1); |
| if (IS_ERR(desc->data_mr)) { |
| ret = PTR_ERR(desc->data_mr); |
| iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); |
| goto fast_reg_mr_failure; |
| } |
| desc->reg_indicators |= ISER_DATA_KEY_VALID; |
| |
| if (pi_enable) { |
| struct ib_mr_init_attr mr_init_attr = {0}; |
| struct iser_pi_context *pi_ctx = NULL; |
| |
| desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); |
| if (!desc->pi_ctx) { |
| iser_err("Failed to allocate pi context\n"); |
| ret = -ENOMEM; |
| goto pi_ctx_alloc_failure; |
| } |
| pi_ctx = desc->pi_ctx; |
| |
| pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device, |
| ISCSI_ISER_SG_TABLESIZE); |
| if (IS_ERR(pi_ctx->prot_frpl)) { |
| ret = PTR_ERR(pi_ctx->prot_frpl); |
| iser_err("Failed to allocate prot frpl ret=%d\n", |
| ret); |
| goto prot_frpl_failure; |
| } |
| |
| pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, |
| ISCSI_ISER_SG_TABLESIZE + 1); |
| if (IS_ERR(pi_ctx->prot_mr)) { |
| ret = PTR_ERR(pi_ctx->prot_mr); |
| iser_err("Failed to allocate prot frmr ret=%d\n", |
| ret); |
| goto prot_mr_failure; |
| } |
| desc->reg_indicators |= ISER_PROT_KEY_VALID; |
| |
| mr_init_attr.max_reg_descriptors = 2; |
| mr_init_attr.flags |= IB_MR_SIGNATURE_EN; |
| pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr); |
| if (IS_ERR(pi_ctx->sig_mr)) { |
| ret = PTR_ERR(pi_ctx->sig_mr); |
| iser_err("Failed to allocate signature enabled mr err=%d\n", |
| ret); |
| goto sig_mr_failure; |
| } |
| desc->reg_indicators |= ISER_SIG_KEY_VALID; |
| } |
| desc->reg_indicators &= ~ISER_FASTREG_PROTECTED; |
| |
| iser_dbg("Create fr_desc %p page_list %p\n", |
| desc, desc->data_frpl->page_list); |
| |
| return 0; |
| sig_mr_failure: |
| ib_dereg_mr(desc->pi_ctx->prot_mr); |
| prot_mr_failure: |
| ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl); |
| prot_frpl_failure: |
| kfree(desc->pi_ctx); |
| pi_ctx_alloc_failure: |
| ib_dereg_mr(desc->data_mr); |
| fast_reg_mr_failure: |
| ib_free_fast_reg_page_list(desc->data_frpl); |
| |
| return ret; |
| } |
| |
| /** |
| * iser_create_fastreg_pool - Creates pool of fast_reg descriptors |
| * for fast registration work requests. |
| * returns 0 on success, or errno code on failure |
| */ |
| int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max) |
| { |
| struct iser_device *device = ib_conn->device; |
| struct fast_reg_descriptor *desc; |
| int i, ret; |
| |
| INIT_LIST_HEAD(&ib_conn->fastreg.pool); |
| ib_conn->fastreg.pool_size = 0; |
| for (i = 0; i < cmds_max; i++) { |
| desc = kzalloc(sizeof(*desc), GFP_KERNEL); |
| if (!desc) { |
| iser_err("Failed to allocate a new fast_reg descriptor\n"); |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| ret = iser_create_fastreg_desc(device->ib_device, device->pd, |
| ib_conn->pi_support, desc); |
| if (ret) { |
| iser_err("Failed to create fastreg descriptor err=%d\n", |
| ret); |
| kfree(desc); |
| goto err; |
| } |
| |
| list_add_tail(&desc->list, &ib_conn->fastreg.pool); |
| ib_conn->fastreg.pool_size++; |
| } |
| |
| return 0; |
| |
| err: |
| iser_free_fastreg_pool(ib_conn); |
| return ret; |
| } |
| |
| /** |
| * iser_free_fastreg_pool - releases the pool of fast_reg descriptors |
| */ |
| void iser_free_fastreg_pool(struct ib_conn *ib_conn) |
| { |
| struct fast_reg_descriptor *desc, *tmp; |
| int i = 0; |
| |
| if (list_empty(&ib_conn->fastreg.pool)) |
| return; |
| |
| iser_info("freeing conn %p fr pool\n", ib_conn); |
| |
| list_for_each_entry_safe(desc, tmp, &ib_conn->fastreg.pool, list) { |
| list_del(&desc->list); |
| ib_free_fast_reg_page_list(desc->data_frpl); |
| ib_dereg_mr(desc->data_mr); |
| if (desc->pi_ctx) { |
| ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl); |
| ib_dereg_mr(desc->pi_ctx->prot_mr); |
| ib_destroy_mr(desc->pi_ctx->sig_mr); |
| kfree(desc->pi_ctx); |
| } |
| kfree(desc); |
| ++i; |
| } |
| |
| if (i < ib_conn->fastreg.pool_size) |
| iser_warn("pool still has %d regions registered\n", |
| ib_conn->fastreg.pool_size - i); |
| } |
| |
| /** |
| * iser_create_ib_conn_res - Queue-Pair (QP) |
| * |
| * returns 0 on success, -1 on failure |
| */ |
| static int iser_create_ib_conn_res(struct ib_conn *ib_conn) |
| { |
| struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn, |
| ib_conn); |
| struct iser_device *device; |
| struct ib_device_attr *dev_attr; |
| struct ib_qp_init_attr init_attr; |
| int ret = -ENOMEM; |
| int index, min_index = 0; |
| |
| BUG_ON(ib_conn->device == NULL); |
| |
| device = ib_conn->device; |
| dev_attr = &device->dev_attr; |
| |
| memset(&init_attr, 0, sizeof init_attr); |
| |
| mutex_lock(&ig.connlist_mutex); |
| /* select the CQ with the minimal number of usages */ |
| for (index = 0; index < device->comps_used; index++) { |
| if (device->comps[index].active_qps < |
| device->comps[min_index].active_qps) |
| min_index = index; |
| } |
| ib_conn->comp = &device->comps[min_index]; |
| ib_conn->comp->active_qps++; |
| mutex_unlock(&ig.connlist_mutex); |
| iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn); |
| |
| init_attr.event_handler = iser_qp_event_callback; |
| init_attr.qp_context = (void *)ib_conn; |
| init_attr.send_cq = ib_conn->comp->cq; |
| init_attr.recv_cq = ib_conn->comp->cq; |
| 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; |
| if (ib_conn->pi_support) { |
| init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; |
| init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; |
| iser_conn->max_cmds = |
| ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS); |
| } else { |
| if (dev_attr->max_qp_wr > ISER_QP_MAX_REQ_DTOS) { |
| init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; |
| iser_conn->max_cmds = |
| ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS); |
| } else { |
| init_attr.cap.max_send_wr = dev_attr->max_qp_wr; |
| iser_conn->max_cmds = |
| ISER_GET_MAX_XMIT_CMDS(dev_attr->max_qp_wr); |
| iser_dbg("device %s supports max_send_wr %d\n", |
| device->ib_device->name, dev_attr->max_qp_wr); |
| } |
| } |
| |
| ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); |
| if (ret) |
| goto out_err; |
| |
| ib_conn->qp = ib_conn->cma_id->qp; |
| iser_info("setting conn %p cma_id %p qp %p\n", |
| ib_conn, ib_conn->cma_id, |
| ib_conn->cma_id->qp); |
| return ret; |
| |
| out_err: |
| mutex_lock(&ig.connlist_mutex); |
| ib_conn->comp->active_qps--; |
| mutex_unlock(&ig.connlist_mutex); |
| iser_err("unable to alloc mem or create resource, err %d\n", ret); |
| |
| return ret; |
| } |
| |
| /** |
| * 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_info("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); |
| } |
| |
| /** |
| * Called with state mutex held |
| **/ |
| static int iser_conn_state_comp_exch(struct iser_conn *iser_conn, |
| enum iser_conn_state comp, |
| enum iser_conn_state exch) |
| { |
| int ret; |
| |
| ret = (iser_conn->state == comp); |
| if (ret) |
| iser_conn->state = exch; |
| |
| return ret; |
| } |
| |
| void iser_release_work(struct work_struct *work) |
| { |
| struct iser_conn *iser_conn; |
| |
| iser_conn = container_of(work, struct iser_conn, release_work); |
| |
| /* Wait for conn_stop to complete */ |
| wait_for_completion(&iser_conn->stop_completion); |
| /* Wait for IB resouces cleanup to complete */ |
| wait_for_completion(&iser_conn->ib_completion); |
| |
| mutex_lock(&iser_conn->state_mutex); |
| iser_conn->state = ISER_CONN_DOWN; |
| mutex_unlock(&iser_conn->state_mutex); |
| |
| iser_conn_release(iser_conn); |
| } |
| |
| /** |
| * iser_free_ib_conn_res - release IB related resources |
| * @iser_conn: iser connection struct |
| * @destroy: indicator if we need to try to release the |
| * iser device and memory regoins pool (only iscsi |
| * shutdown and DEVICE_REMOVAL will use this). |
| * |
| * This routine is called with the iser state mutex held |
| * so the cm_id removal is out of here. It is Safe to |
| * be invoked multiple times. |
| */ |
| static void iser_free_ib_conn_res(struct iser_conn *iser_conn, |
| bool destroy) |
| { |
| struct ib_conn *ib_conn = &iser_conn->ib_conn; |
| struct iser_device *device = ib_conn->device; |
| |
| iser_info("freeing conn %p cma_id %p qp %p\n", |
| iser_conn, ib_conn->cma_id, ib_conn->qp); |
| |
| if (ib_conn->qp != NULL) { |
| ib_conn->comp->active_qps--; |
| rdma_destroy_qp(ib_conn->cma_id); |
| ib_conn->qp = NULL; |
| } |
| |
| if (destroy) { |
| if (iser_conn->rx_descs) |
| iser_free_rx_descriptors(iser_conn); |
| |
| if (device != NULL) { |
| iser_device_try_release(device); |
| ib_conn->device = NULL; |
| } |
| } |
| } |
| |
| /** |
| * Frees all conn objects and deallocs conn descriptor |
| */ |
| void iser_conn_release(struct iser_conn *iser_conn) |
| { |
| struct ib_conn *ib_conn = &iser_conn->ib_conn; |
| |
| mutex_lock(&ig.connlist_mutex); |
| list_del(&iser_conn->conn_list); |
| mutex_unlock(&ig.connlist_mutex); |
| |
| mutex_lock(&iser_conn->state_mutex); |
| /* In case we endup here without ep_disconnect being invoked. */ |
| if (iser_conn->state != ISER_CONN_DOWN) { |
| iser_warn("iser conn %p state %d, expected state down.\n", |
| iser_conn, iser_conn->state); |
| iscsi_destroy_endpoint(iser_conn->ep); |
| iser_conn->state = ISER_CONN_DOWN; |
| } |
| /* |
| * In case we never got to bind stage, we still need to |
| * release IB resources (which is safe to call more than once). |
| */ |
| iser_free_ib_conn_res(iser_conn, true); |
| mutex_unlock(&iser_conn->state_mutex); |
| |
| if (ib_conn->cma_id != NULL) { |
| rdma_destroy_id(ib_conn->cma_id); |
| ib_conn->cma_id = NULL; |
| } |
| |
| kfree(iser_conn); |
| } |
| |
| /** |
| * triggers start of the disconnect procedures and wait for them to be done |
| * Called with state mutex held |
| */ |
| int iser_conn_terminate(struct iser_conn *iser_conn) |
| { |
| struct ib_conn *ib_conn = &iser_conn->ib_conn; |
| struct ib_send_wr *bad_wr; |
| int err = 0; |
| |
| /* terminate the iser conn only if the conn state is UP */ |
| if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP, |
| ISER_CONN_TERMINATING)) |
| return 0; |
| |
| iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); |
| |
| /* suspend queuing of new iscsi commands */ |
| if (iser_conn->iscsi_conn) |
| iscsi_suspend_queue(iser_conn->iscsi_conn); |
| |
| /* |
| * In case we didn't already clean up the cma_id (peer initiated |
| * a disconnection), we need to Cause the CMA to change the QP |
| * state to ERROR. |
| */ |
| if (ib_conn->cma_id) { |
| err = rdma_disconnect(ib_conn->cma_id); |
| if (err) |
| iser_err("Failed to disconnect, conn: 0x%p err %d\n", |
| iser_conn, err); |
| |
| /* post an indication that all flush errors were consumed */ |
| err = ib_post_send(ib_conn->qp, &ib_conn->beacon, &bad_wr); |
| if (err) { |
| iser_err("conn %p failed to post beacon", ib_conn); |
| return 1; |
| } |
| |
| wait_for_completion(&ib_conn->flush_comp); |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Called with state mutex held |
| **/ |
| static void iser_connect_error(struct rdma_cm_id *cma_id) |
| { |
| struct iser_conn *iser_conn; |
| |
| iser_conn = (struct iser_conn *)cma_id->context; |
| iser_conn->state = ISER_CONN_DOWN; |
| } |
| |
| /** |
| * Called with state mutex held |
| **/ |
| static void iser_addr_handler(struct rdma_cm_id *cma_id) |
| { |
| struct iser_device *device; |
| struct iser_conn *iser_conn; |
| struct ib_conn *ib_conn; |
| int ret; |
| |
| iser_conn = (struct iser_conn *)cma_id->context; |
| if (iser_conn->state != ISER_CONN_PENDING) |
| /* bailout */ |
| return; |
| |
| ib_conn = &iser_conn->ib_conn; |
| 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->device = device; |
| |
| /* connection T10-PI support */ |
| if (iser_pi_enable) { |
| if (!(device->dev_attr.device_cap_flags & |
| IB_DEVICE_SIGNATURE_HANDOVER)) { |
| iser_warn("T10-PI requested but not supported on %s, " |
| "continue without T10-PI\n", |
| ib_conn->device->ib_device->name); |
| ib_conn->pi_support = false; |
| } else { |
| ib_conn->pi_support = true; |
| } |
| } |
| |
| ret = rdma_resolve_route(cma_id, 1000); |
| if (ret) { |
| iser_err("resolve route failed: %d\n", ret); |
| iser_connect_error(cma_id); |
| return; |
| } |
| } |
| |
| /** |
| * Called with state mutex held |
| **/ |
| static void iser_route_handler(struct rdma_cm_id *cma_id) |
| { |
| struct rdma_conn_param conn_param; |
| int ret; |
| struct iser_cm_hdr req_hdr; |
| struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; |
| struct ib_conn *ib_conn = &iser_conn->ib_conn; |
| struct iser_device *device = ib_conn->device; |
| |
| if (iser_conn->state != ISER_CONN_PENDING) |
| /* bailout */ |
| return; |
| |
| ret = iser_create_ib_conn_res(ib_conn); |
| if (ret) |
| goto failure; |
| |
| memset(&conn_param, 0, sizeof conn_param); |
| conn_param.responder_resources = device->dev_attr.max_qp_rd_atom; |
| conn_param.initiator_depth = 1; |
| conn_param.retry_count = 7; |
| conn_param.rnr_retry_count = 6; |
| |
| memset(&req_hdr, 0, sizeof(req_hdr)); |
| req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED | |
| ISER_SEND_W_INV_NOT_SUPPORTED); |
| conn_param.private_data = (void *)&req_hdr; |
| conn_param.private_data_len = sizeof(struct iser_cm_hdr); |
| |
| 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 *iser_conn; |
| struct ib_qp_attr attr; |
| struct ib_qp_init_attr init_attr; |
| |
| iser_conn = (struct iser_conn *)cma_id->context; |
| if (iser_conn->state != ISER_CONN_PENDING) |
| /* bailout */ |
| return; |
| |
| (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); |
| iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); |
| |
| iser_conn->state = ISER_CONN_UP; |
| complete(&iser_conn->up_completion); |
| } |
| |
| static void iser_disconnected_handler(struct rdma_cm_id *cma_id) |
| { |
| struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; |
| |
| if (iser_conn_terminate(iser_conn)) { |
| if (iser_conn->iscsi_conn) |
| iscsi_conn_failure(iser_conn->iscsi_conn, |
| ISCSI_ERR_CONN_FAILED); |
| else |
| iser_err("iscsi_iser connection isn't bound\n"); |
| } |
| } |
| |
| static void iser_cleanup_handler(struct rdma_cm_id *cma_id, |
| bool destroy) |
| { |
| struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; |
| |
| /* |
| * We are not guaranteed that we visited disconnected_handler |
| * by now, call it here to be safe that we handle CM drep |
| * and flush errors. |
| */ |
| iser_disconnected_handler(cma_id); |
| iser_free_ib_conn_res(iser_conn, destroy); |
| complete(&iser_conn->ib_completion); |
| }; |
| |
| static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) |
| { |
| struct iser_conn *iser_conn; |
| int ret = 0; |
| |
| iser_conn = (struct iser_conn *)cma_id->context; |
| iser_info("event %d status %d conn %p id %p\n", |
| event->event, event->status, cma_id->context, cma_id); |
| |
| mutex_lock(&iser_conn->state_mutex); |
| 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_connect_error(cma_id); |
| break; |
| case RDMA_CM_EVENT_DISCONNECTED: |
| case RDMA_CM_EVENT_ADDR_CHANGE: |
| case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
| iser_cleanup_handler(cma_id, false); |
| break; |
| case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| /* |
| * we *must* destroy the device as we cannot rely |
| * on iscsid to be around to initiate error handling. |
| * also if we are not in state DOWN implicitly destroy |
| * the cma_id. |
| */ |
| iser_cleanup_handler(cma_id, true); |
| if (iser_conn->state != ISER_CONN_DOWN) { |
| iser_conn->ib_conn.cma_id = NULL; |
| ret = 1; |
| } |
| break; |
| default: |
| iser_err("Unexpected RDMA CM event (%d)\n", event->event); |
| break; |
| } |
| mutex_unlock(&iser_conn->state_mutex); |
| |
| return ret; |
| } |
| |
| void iser_conn_init(struct iser_conn *iser_conn) |
| { |
| iser_conn->state = ISER_CONN_INIT; |
| iser_conn->ib_conn.post_recv_buf_count = 0; |
| init_completion(&iser_conn->ib_conn.flush_comp); |
| init_completion(&iser_conn->stop_completion); |
| init_completion(&iser_conn->ib_completion); |
| init_completion(&iser_conn->up_completion); |
| INIT_LIST_HEAD(&iser_conn->conn_list); |
| spin_lock_init(&iser_conn->ib_conn.lock); |
| mutex_init(&iser_conn->state_mutex); |
| } |
| |
| /** |
| * starts the process of connecting to the target |
| * sleeps until the connection is established or rejected |
| */ |
| int iser_connect(struct iser_conn *iser_conn, |
| struct sockaddr *src_addr, |
| struct sockaddr *dst_addr, |
| int non_blocking) |
| { |
| struct ib_conn *ib_conn = &iser_conn->ib_conn; |
| int err = 0; |
| |
| mutex_lock(&iser_conn->state_mutex); |
| |
| sprintf(iser_conn->name, "%pISp", dst_addr); |
| |
| iser_info("connecting to: %s\n", iser_conn->name); |
| |
| /* the device is known only --after-- address resolution */ |
| ib_conn->device = NULL; |
| |
| iser_conn->state = ISER_CONN_PENDING; |
| |
| ib_conn->beacon.wr_id = ISER_BEACON_WRID; |
| ib_conn->beacon.opcode = IB_WR_SEND; |
| |
| ib_conn->cma_id = rdma_create_id(iser_cma_handler, |
| (void *)iser_conn, |
| RDMA_PS_TCP, IB_QPT_RC); |
| 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; |
| } |
| |
| err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); |
| if (err) { |
| iser_err("rdma_resolve_addr failed: %d\n", err); |
| goto addr_failure; |
| } |
| |
| if (!non_blocking) { |
| wait_for_completion_interruptible(&iser_conn->up_completion); |
| |
| if (iser_conn->state != ISER_CONN_UP) { |
| err = -EIO; |
| goto connect_failure; |
| } |
| } |
| mutex_unlock(&iser_conn->state_mutex); |
| |
| mutex_lock(&ig.connlist_mutex); |
| list_add(&iser_conn->conn_list, &ig.connlist); |
| mutex_unlock(&ig.connlist_mutex); |
| return 0; |
| |
| id_failure: |
| ib_conn->cma_id = NULL; |
| addr_failure: |
| iser_conn->state = ISER_CONN_DOWN; |
| connect_failure: |
| mutex_unlock(&iser_conn->state_mutex); |
| iser_conn_release(iser_conn); |
| return err; |
| } |
| |
| /** |
| * iser_reg_page_vec - Register physical memory |
| * |
| * returns: 0 on success, errno code on failure |
| */ |
| int iser_reg_page_vec(struct ib_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->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 using FMR) memory. |
| * If memory is non-FMR does nothing. |
| */ |
| void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, |
| enum iser_data_dir cmd_dir) |
| { |
| struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg; |
| int ret; |
| |
| if (!reg->mem_h) |
| return; |
| |
| 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; |
| } |
| |
| void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, |
| enum iser_data_dir cmd_dir) |
| { |
| struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg; |
| struct iser_conn *iser_conn = iser_task->iser_conn; |
| struct ib_conn *ib_conn = &iser_conn->ib_conn; |
| struct fast_reg_descriptor *desc = reg->mem_h; |
| |
| if (!desc) |
| return; |
| |
| reg->mem_h = NULL; |
| spin_lock_bh(&ib_conn->lock); |
| list_add_tail(&desc->list, &ib_conn->fastreg.pool); |
| spin_unlock_bh(&ib_conn->lock); |
| } |
| |
| int iser_post_recvl(struct iser_conn *iser_conn) |
| { |
| struct ib_recv_wr rx_wr, *rx_wr_failed; |
| struct ib_conn *ib_conn = &iser_conn->ib_conn; |
| struct ib_sge sge; |
| int ib_ret; |
| |
| sge.addr = iser_conn->login_resp_dma; |
| sge.length = ISER_RX_LOGIN_SIZE; |
| sge.lkey = ib_conn->device->mr->lkey; |
| |
| rx_wr.wr_id = (uintptr_t)iser_conn->login_resp_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 *iser_conn, int count) |
| { |
| struct ib_recv_wr *rx_wr, *rx_wr_failed; |
| int i, ib_ret; |
| struct ib_conn *ib_conn = &iser_conn->ib_conn; |
| unsigned int my_rx_head = iser_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 = &iser_conn->rx_descs[my_rx_head]; |
| rx_wr->wr_id = (uintptr_t)rx_desc; |
| rx_wr->sg_list = &rx_desc->rx_sg; |
| rx_wr->num_sge = 1; |
| rx_wr->next = rx_wr + 1; |
| my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask; |
| } |
| |
| 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 |
| iser_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 ib_conn *ib_conn, struct iser_tx_desc *tx_desc, |
| bool signal) |
| { |
| 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 = (uintptr_t)tx_desc; |
| send_wr.sg_list = tx_desc->tx_sg; |
| send_wr.num_sge = tx_desc->num_sge; |
| send_wr.opcode = IB_WR_SEND; |
| send_wr.send_flags = signal ? IB_SEND_SIGNALED : 0; |
| |
| 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); |
| |
| return ib_ret; |
| } |
| |
| /** |
| * is_iser_tx_desc - Indicate if the completion wr_id |
| * is a TX descriptor or not. |
| * @iser_conn: iser connection |
| * @wr_id: completion WR identifier |
| * |
| * Since we cannot rely on wc opcode in FLUSH errors |
| * we must work around it by checking if the wr_id address |
| * falls in the iser connection rx_descs buffer. If so |
| * it is an RX descriptor, otherwize it is a TX. |
| */ |
| static inline bool |
| is_iser_tx_desc(struct iser_conn *iser_conn, void *wr_id) |
| { |
| void *start = iser_conn->rx_descs; |
| int len = iser_conn->num_rx_descs * sizeof(*iser_conn->rx_descs); |
| |
| if (wr_id >= start && wr_id < start + len) |
| return false; |
| |
| return true; |
| } |
| |
| /** |
| * iser_handle_comp_error() - Handle error completion |
| * @ib_conn: connection RDMA resources |
| * @wc: work completion |
| * |
| * Notes: We may handle a FLUSH error completion and in this case |
| * we only cleanup in case TX type was DATAOUT. For non-FLUSH |
| * error completion we should also notify iscsi layer that |
| * connection is failed (in case we passed bind stage). |
| */ |
| static void |
| iser_handle_comp_error(struct ib_conn *ib_conn, |
| struct ib_wc *wc) |
| { |
| void *wr_id = (void *)(uintptr_t)wc->wr_id; |
| struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn, |
| ib_conn); |
| |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| if (iser_conn->iscsi_conn) |
| iscsi_conn_failure(iser_conn->iscsi_conn, |
| ISCSI_ERR_CONN_FAILED); |
| |
| if (is_iser_tx_desc(iser_conn, wr_id)) { |
| struct iser_tx_desc *desc = wr_id; |
| |
| if (desc->type == ISCSI_TX_DATAOUT) |
| kmem_cache_free(ig.desc_cache, desc); |
| } else { |
| ib_conn->post_recv_buf_count--; |
| } |
| } |
| |
| /** |
| * iser_handle_wc - handle a single work completion |
| * @wc: work completion |
| * |
| * Soft-IRQ context, work completion can be either |
| * SEND or RECV, and can turn out successful or |
| * with error (or flush error). |
| */ |
| static void iser_handle_wc(struct ib_wc *wc) |
| { |
| struct ib_conn *ib_conn; |
| struct iser_tx_desc *tx_desc; |
| struct iser_rx_desc *rx_desc; |
| |
| ib_conn = wc->qp->qp_context; |
| if (likely(wc->status == IB_WC_SUCCESS)) { |
| if (wc->opcode == IB_WC_RECV) { |
| rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id; |
| iser_rcv_completion(rx_desc, wc->byte_len, |
| ib_conn); |
| } else |
| if (wc->opcode == IB_WC_SEND) { |
| tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; |
| iser_snd_completion(tx_desc, ib_conn); |
| } else { |
| iser_err("Unknown wc opcode %d\n", wc->opcode); |
| } |
| } else { |
| if (wc->status != IB_WC_WR_FLUSH_ERR) |
| iser_err("wr id %llx status %d vend_err %x\n", |
| wc->wr_id, wc->status, wc->vendor_err); |
| else |
| iser_dbg("flush error: wr id %llx\n", wc->wr_id); |
| |
| if (wc->wr_id != ISER_FASTREG_LI_WRID && |
| wc->wr_id != ISER_BEACON_WRID) |
| iser_handle_comp_error(ib_conn, wc); |
| |
| /* complete in case all flush errors were consumed */ |
| if (wc->wr_id == ISER_BEACON_WRID) |
| complete(&ib_conn->flush_comp); |
| } |
| } |
| |
| /** |
| * iser_cq_tasklet_fn - iSER completion polling loop |
| * @data: iSER completion context |
| * |
| * Soft-IRQ context, polling connection CQ until |
| * either CQ was empty or we exausted polling budget |
| */ |
| static void iser_cq_tasklet_fn(unsigned long data) |
| { |
| struct iser_comp *comp = (struct iser_comp *)data; |
| struct ib_cq *cq = comp->cq; |
| struct ib_wc *const wcs = comp->wcs; |
| int i, n, completed = 0; |
| |
| while ((n = ib_poll_cq(cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) { |
| for (i = 0; i < n; i++) |
| iser_handle_wc(&wcs[i]); |
| |
| completed += n; |
| if (completed >= iser_cq_poll_limit) |
| break; |
| } |
| |
| /* |
| * 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); |
| |
| iser_dbg("got %d completions\n", completed); |
| } |
| |
| static void iser_cq_callback(struct ib_cq *cq, void *cq_context) |
| { |
| struct iser_comp *comp = cq_context; |
| |
| tasklet_schedule(&comp->tasklet); |
| } |
| |
| u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, |
| enum iser_data_dir cmd_dir, sector_t *sector) |
| { |
| struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg; |
| struct fast_reg_descriptor *desc = reg->mem_h; |
| unsigned long sector_size = iser_task->sc->device->sector_size; |
| struct ib_mr_status mr_status; |
| int ret; |
| |
| if (desc && desc->reg_indicators & ISER_FASTREG_PROTECTED) { |
| desc->reg_indicators &= ~ISER_FASTREG_PROTECTED; |
| ret = ib_check_mr_status(desc->pi_ctx->sig_mr, |
| IB_MR_CHECK_SIG_STATUS, &mr_status); |
| if (ret) { |
| pr_err("ib_check_mr_status failed, ret %d\n", ret); |
| goto err; |
| } |
| |
| if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { |
| sector_t sector_off = mr_status.sig_err.sig_err_offset; |
| |
| do_div(sector_off, sector_size + 8); |
| *sector = scsi_get_lba(iser_task->sc) + sector_off; |
| |
| pr_err("PI error found type %d at sector %llx " |
| "expected %x vs actual %x\n", |
| mr_status.sig_err.err_type, |
| (unsigned long long)*sector, |
| mr_status.sig_err.expected, |
| mr_status.sig_err.actual); |
| |
| switch (mr_status.sig_err.err_type) { |
| case IB_SIG_BAD_GUARD: |
| return 0x1; |
| case IB_SIG_BAD_REFTAG: |
| return 0x3; |
| case IB_SIG_BAD_APPTAG: |
| return 0x2; |
| } |
| } |
| } |
| |
| return 0; |
| err: |
| /* Not alot we can do here, return ambiguous guard error */ |
| return 0x1; |
| } |