diff options
Diffstat (limited to 'kernel/drivers/infiniband/ulp/iser/iser_verbs.c')
| -rw-r--r-- | kernel/drivers/infiniband/ulp/iser/iser_verbs.c | 1274 |
1 files changed, 1274 insertions, 0 deletions
diff --git a/kernel/drivers/infiniband/ulp/iser/iser_verbs.c b/kernel/drivers/infiniband/ulp/iser/iser_verbs.c new file mode 100644 index 000000000..cc2dd35ff --- /dev/null +++ b/kernel/drivers/infiniband/ulp/iser/iser_verbs.c @@ -0,0 +1,1274 @@ +/* + * 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_alloc_pi_ctx(struct ib_device *ib_device, struct ib_pd *pd, + struct fast_reg_descriptor *desc) +{ + struct iser_pi_context *pi_ctx = NULL; + struct ib_mr_init_attr mr_init_attr = {.max_reg_descriptors = 2, + .flags = IB_MR_SIGNATURE_EN}; + int ret = 0; + + desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); + if (!desc->pi_ctx) + return -ENOMEM; + + 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); + 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); + goto prot_mr_failure; + } + desc->reg_indicators |= ISER_PROT_KEY_VALID; + + 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); + goto sig_mr_failure; + } + desc->reg_indicators |= ISER_SIG_KEY_VALID; + desc->reg_indicators &= ~ISER_FASTREG_PROTECTED; + + 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); + + return ret; +} + +static void +iser_free_pi_ctx(struct iser_pi_context *pi_ctx) +{ + ib_free_fast_reg_page_list(pi_ctx->prot_frpl); + ib_dereg_mr(pi_ctx->prot_mr); + ib_destroy_mr(pi_ctx->sig_mr); + kfree(pi_ctx); +} + +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) { + ret = iser_alloc_pi_ctx(ib_device, pd, desc); + if (ret) + goto pi_ctx_alloc_failure; + } + + return 0; +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) + iser_free_pi_ctx(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_TERMINATING; +} + +/** + * 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; +} + +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 (wc->wr_id == ISER_FASTREG_LI_WRID) + return; + + 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_BEACON_WRID) + /* all flush errors were consumed */ + complete(&ib_conn->flush_comp); + else + iser_handle_comp_error(ib_conn, wc); + } +} + +/** + * 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_reg[cmd_dir]; + 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; +} |