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991 lines
26 KiB
991 lines
26 KiB
/* |
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* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. |
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* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. |
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* Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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|
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#include "iscsi_iser.h" |
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|
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#define ISCSI_ISER_MAX_CONN 8 |
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#define ISER_MAX_RX_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) |
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#define ISER_MAX_TX_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) |
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#define ISER_MAX_CQ_LEN (ISER_MAX_RX_LEN + ISER_MAX_TX_LEN + \ |
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ISCSI_ISER_MAX_CONN) |
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|
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static void iser_qp_event_callback(struct ib_event *cause, void *context) |
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{ |
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iser_err("qp event %s (%d)\n", |
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ib_event_msg(cause->event), cause->event); |
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} |
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|
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static void iser_event_handler(struct ib_event_handler *handler, |
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struct ib_event *event) |
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{ |
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iser_err("async event %s (%d) on device %s port %d\n", |
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ib_event_msg(event->event), event->event, |
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dev_name(&event->device->dev), event->element.port_num); |
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} |
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|
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/* |
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* iser_create_device_ib_res - creates Protection Domain (PD), Completion |
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* Queue (CQ), DMA Memory Region (DMA MR) with the device associated with |
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* the adaptor. |
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* |
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* Return: 0 on success, -1 on failure |
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*/ |
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static int iser_create_device_ib_res(struct iser_device *device) |
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{ |
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struct ib_device *ib_dev = device->ib_device; |
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|
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if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) { |
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iser_err("IB device does not support memory registrations\n"); |
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return -1; |
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} |
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|
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device->pd = ib_alloc_pd(ib_dev, |
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iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY); |
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if (IS_ERR(device->pd)) |
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goto pd_err; |
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INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev, |
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iser_event_handler); |
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ib_register_event_handler(&device->event_handler); |
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return 0; |
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pd_err: |
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iser_err("failed to allocate an IB resource\n"); |
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return -1; |
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} |
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|
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/* |
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* iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, |
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* CQ and PD created with the device associated with the adaptor. |
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*/ |
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static void iser_free_device_ib_res(struct iser_device *device) |
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{ |
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ib_unregister_event_handler(&device->event_handler); |
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ib_dealloc_pd(device->pd); |
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|
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device->pd = NULL; |
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} |
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|
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static struct iser_fr_desc * |
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iser_create_fastreg_desc(struct iser_device *device, |
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struct ib_pd *pd, |
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bool pi_enable, |
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unsigned int size) |
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{ |
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struct iser_fr_desc *desc; |
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struct ib_device *ib_dev = device->ib_device; |
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enum ib_mr_type mr_type; |
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int ret; |
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desc = kzalloc(sizeof(*desc), GFP_KERNEL); |
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if (!desc) |
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return ERR_PTR(-ENOMEM); |
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if (ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) |
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mr_type = IB_MR_TYPE_SG_GAPS; |
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else |
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mr_type = IB_MR_TYPE_MEM_REG; |
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|
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desc->rsc.mr = ib_alloc_mr(pd, mr_type, size); |
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if (IS_ERR(desc->rsc.mr)) { |
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ret = PTR_ERR(desc->rsc.mr); |
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iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); |
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goto err_alloc_mr; |
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} |
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if (pi_enable) { |
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desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size); |
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if (IS_ERR(desc->rsc.sig_mr)) { |
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ret = PTR_ERR(desc->rsc.sig_mr); |
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iser_err("Failed to allocate sig_mr err=%d\n", ret); |
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goto err_alloc_mr_integrity; |
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} |
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} |
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desc->rsc.mr_valid = 0; |
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|
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return desc; |
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err_alloc_mr_integrity: |
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ib_dereg_mr(desc->rsc.mr); |
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err_alloc_mr: |
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kfree(desc); |
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|
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return ERR_PTR(ret); |
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} |
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static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc) |
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{ |
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struct iser_reg_resources *res = &desc->rsc; |
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|
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ib_dereg_mr(res->mr); |
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if (res->sig_mr) { |
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ib_dereg_mr(res->sig_mr); |
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res->sig_mr = NULL; |
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} |
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kfree(desc); |
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} |
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|
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/** |
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* iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors |
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* for fast registration work requests. |
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* @ib_conn: connection RDMA resources |
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* @cmds_max: max number of SCSI commands for this connection |
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* @size: max number of pages per map request |
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* |
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* Return: 0 on success, or errno code on failure |
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*/ |
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int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, |
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unsigned cmds_max, |
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unsigned int size) |
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{ |
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struct iser_device *device = ib_conn->device; |
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struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; |
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struct iser_fr_desc *desc; |
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int i, ret; |
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|
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INIT_LIST_HEAD(&fr_pool->list); |
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INIT_LIST_HEAD(&fr_pool->all_list); |
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spin_lock_init(&fr_pool->lock); |
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fr_pool->size = 0; |
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for (i = 0; i < cmds_max; i++) { |
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desc = iser_create_fastreg_desc(device, device->pd, |
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ib_conn->pi_support, size); |
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if (IS_ERR(desc)) { |
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ret = PTR_ERR(desc); |
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goto err; |
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} |
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list_add_tail(&desc->list, &fr_pool->list); |
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list_add_tail(&desc->all_list, &fr_pool->all_list); |
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fr_pool->size++; |
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} |
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return 0; |
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|
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err: |
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iser_free_fastreg_pool(ib_conn); |
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return ret; |
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} |
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|
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/** |
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* iser_free_fastreg_pool - releases the pool of fast_reg descriptors |
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* @ib_conn: connection RDMA resources |
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*/ |
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void iser_free_fastreg_pool(struct ib_conn *ib_conn) |
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{ |
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struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; |
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struct iser_fr_desc *desc, *tmp; |
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int i = 0; |
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|
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if (list_empty(&fr_pool->all_list)) |
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return; |
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iser_info("freeing conn %p fr pool\n", ib_conn); |
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|
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list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) { |
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list_del(&desc->all_list); |
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iser_destroy_fastreg_desc(desc); |
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++i; |
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} |
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if (i < fr_pool->size) |
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iser_warn("pool still has %d regions registered\n", |
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fr_pool->size - i); |
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} |
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/* |
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* iser_create_ib_conn_res - Queue-Pair (QP) |
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* |
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* Return: 0 on success, -1 on failure |
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*/ |
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static int iser_create_ib_conn_res(struct ib_conn *ib_conn) |
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{ |
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struct iser_conn *iser_conn = to_iser_conn(ib_conn); |
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struct iser_device *device; |
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struct ib_device *ib_dev; |
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struct ib_qp_init_attr init_attr; |
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int ret = -ENOMEM; |
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unsigned int max_send_wr, cq_size; |
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|
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BUG_ON(ib_conn->device == NULL); |
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device = ib_conn->device; |
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ib_dev = device->ib_device; |
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if (ib_conn->pi_support) |
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max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; |
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else |
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max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; |
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max_send_wr = min_t(unsigned int, max_send_wr, |
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(unsigned int)ib_dev->attrs.max_qp_wr); |
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cq_size = max_send_wr + ISER_QP_MAX_RECV_DTOS; |
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ib_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_SOFTIRQ); |
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if (IS_ERR(ib_conn->cq)) { |
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ret = PTR_ERR(ib_conn->cq); |
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goto cq_err; |
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} |
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ib_conn->cq_size = cq_size; |
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memset(&init_attr, 0, sizeof(init_attr)); |
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init_attr.event_handler = iser_qp_event_callback; |
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init_attr.qp_context = (void *)ib_conn; |
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init_attr.send_cq = ib_conn->cq; |
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init_attr.recv_cq = ib_conn->cq; |
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init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; |
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init_attr.cap.max_send_sge = 2; |
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init_attr.cap.max_recv_sge = 1; |
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init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
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init_attr.qp_type = IB_QPT_RC; |
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init_attr.cap.max_send_wr = max_send_wr; |
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if (ib_conn->pi_support) |
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init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN; |
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iser_conn->max_cmds = ISER_GET_MAX_XMIT_CMDS(max_send_wr - 1); |
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ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); |
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if (ret) |
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goto out_err; |
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ib_conn->qp = ib_conn->cma_id->qp; |
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iser_info("setting conn %p cma_id %p qp %p max_send_wr %d\n", |
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ib_conn, ib_conn->cma_id, |
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ib_conn->cma_id->qp, max_send_wr); |
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return ret; |
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out_err: |
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ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size); |
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cq_err: |
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iser_err("unable to alloc mem or create resource, err %d\n", ret); |
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return ret; |
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} |
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|
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/* |
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* based on the resolved device node GUID see if there already allocated |
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* device for this device. If there's no such, create one. |
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*/ |
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static |
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struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) |
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{ |
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struct iser_device *device; |
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|
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mutex_lock(&ig.device_list_mutex); |
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list_for_each_entry(device, &ig.device_list, ig_list) |
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/* find if there's a match using the node GUID */ |
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if (device->ib_device->node_guid == cma_id->device->node_guid) |
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goto inc_refcnt; |
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device = kzalloc(sizeof *device, GFP_KERNEL); |
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if (device == NULL) |
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goto out; |
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/* assign this device to the device */ |
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device->ib_device = cma_id->device; |
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/* init the device and link it into ig device list */ |
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if (iser_create_device_ib_res(device)) { |
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kfree(device); |
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device = NULL; |
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goto out; |
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} |
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list_add(&device->ig_list, &ig.device_list); |
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inc_refcnt: |
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device->refcount++; |
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out: |
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mutex_unlock(&ig.device_list_mutex); |
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return device; |
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} |
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|
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/* if there's no demand for this device, release it */ |
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static void iser_device_try_release(struct iser_device *device) |
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{ |
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mutex_lock(&ig.device_list_mutex); |
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device->refcount--; |
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iser_info("device %p refcount %d\n", device, device->refcount); |
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if (!device->refcount) { |
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iser_free_device_ib_res(device); |
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list_del(&device->ig_list); |
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kfree(device); |
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} |
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mutex_unlock(&ig.device_list_mutex); |
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} |
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|
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/* |
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* Called with state mutex held |
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*/ |
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static int iser_conn_state_comp_exch(struct iser_conn *iser_conn, |
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enum iser_conn_state comp, |
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enum iser_conn_state exch) |
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{ |
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int ret; |
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|
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ret = (iser_conn->state == comp); |
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if (ret) |
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iser_conn->state = exch; |
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|
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return ret; |
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} |
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|
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void iser_release_work(struct work_struct *work) |
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{ |
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struct iser_conn *iser_conn; |
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|
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iser_conn = container_of(work, struct iser_conn, release_work); |
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|
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/* Wait for conn_stop to complete */ |
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wait_for_completion(&iser_conn->stop_completion); |
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/* Wait for IB resouces cleanup to complete */ |
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wait_for_completion(&iser_conn->ib_completion); |
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|
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mutex_lock(&iser_conn->state_mutex); |
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iser_conn->state = ISER_CONN_DOWN; |
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mutex_unlock(&iser_conn->state_mutex); |
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|
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iser_conn_release(iser_conn); |
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} |
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|
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/** |
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* iser_free_ib_conn_res - release IB related resources |
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* @iser_conn: iser connection struct |
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* @destroy: indicator if we need to try to release the |
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* iser device and memory regoins pool (only iscsi |
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* shutdown and DEVICE_REMOVAL will use this). |
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* |
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* This routine is called with the iser state mutex held |
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* so the cm_id removal is out of here. It is Safe to |
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* be invoked multiple times. |
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*/ |
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static void iser_free_ib_conn_res(struct iser_conn *iser_conn, |
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bool destroy) |
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{ |
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struct ib_conn *ib_conn = &iser_conn->ib_conn; |
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struct iser_device *device = ib_conn->device; |
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|
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iser_info("freeing conn %p cma_id %p qp %p\n", |
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iser_conn, ib_conn->cma_id, ib_conn->qp); |
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|
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if (ib_conn->qp != NULL) { |
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rdma_destroy_qp(ib_conn->cma_id); |
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ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size); |
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ib_conn->qp = NULL; |
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} |
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|
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if (destroy) { |
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if (iser_conn->rx_descs) |
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iser_free_rx_descriptors(iser_conn); |
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|
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if (device != NULL) { |
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iser_device_try_release(device); |
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ib_conn->device = NULL; |
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} |
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} |
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} |
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|
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/** |
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* iser_conn_release - Frees all conn objects and deallocs conn descriptor |
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* @iser_conn: iSER connection context |
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*/ |
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void iser_conn_release(struct iser_conn *iser_conn) |
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{ |
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struct ib_conn *ib_conn = &iser_conn->ib_conn; |
|
|
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mutex_lock(&ig.connlist_mutex); |
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list_del(&iser_conn->conn_list); |
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mutex_unlock(&ig.connlist_mutex); |
|
|
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mutex_lock(&iser_conn->state_mutex); |
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/* In case we endup here without ep_disconnect being invoked. */ |
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if (iser_conn->state != ISER_CONN_DOWN) { |
|
iser_warn("iser conn %p state %d, expected state down.\n", |
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iser_conn, iser_conn->state); |
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iscsi_destroy_endpoint(iser_conn->ep); |
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iser_conn->state = ISER_CONN_DOWN; |
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} |
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/* |
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* In case we never got to bind stage, we still need to |
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* release IB resources (which is safe to call more than once). |
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*/ |
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iser_free_ib_conn_res(iser_conn, true); |
|
mutex_unlock(&iser_conn->state_mutex); |
|
|
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if (ib_conn->cma_id != NULL) { |
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rdma_destroy_id(ib_conn->cma_id); |
|
ib_conn->cma_id = NULL; |
|
} |
|
|
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kfree(iser_conn); |
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} |
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|
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/** |
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* iser_conn_terminate - triggers start of the disconnect procedures and |
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* waits for them to be done |
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* @iser_conn: iSER connection context |
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* |
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* Called with state mutex held |
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*/ |
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int iser_conn_terminate(struct iser_conn *iser_conn) |
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{ |
|
struct ib_conn *ib_conn = &iser_conn->ib_conn; |
|
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, |
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ISER_CONN_TERMINATING)) |
|
return 0; |
|
|
|
iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); |
|
|
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/* suspend queuing of new iscsi commands */ |
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if (iser_conn->iscsi_conn) |
|
iscsi_suspend_queue(iser_conn->iscsi_conn); |
|
|
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/* |
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* 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 |
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* 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); |
|
|
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/* block until all flush errors are consumed */ |
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ib_drain_sq(ib_conn->qp); |
|
} |
|
|
|
return 1; |
|
} |
|
|
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/* |
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* 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; |
|
} |
|
|
|
static void |
|
iser_calc_scsi_params(struct iser_conn *iser_conn, |
|
unsigned int max_sectors) |
|
{ |
|
struct iser_device *device = iser_conn->ib_conn.device; |
|
struct ib_device_attr *attr = &device->ib_device->attrs; |
|
unsigned short sg_tablesize, sup_sg_tablesize; |
|
unsigned short reserved_mr_pages; |
|
u32 max_num_sg; |
|
|
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/* |
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* FRs without SG_GAPS can only map up to a (device) page per entry, |
|
* but if the first entry is misaligned we'll end up using two entries |
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* (head and tail) for a single page worth data, so one additional |
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* entry is required. |
|
*/ |
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if (attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG) |
|
reserved_mr_pages = 0; |
|
else |
|
reserved_mr_pages = 1; |
|
|
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if (iser_conn->ib_conn.pi_support) |
|
max_num_sg = attr->max_pi_fast_reg_page_list_len; |
|
else |
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max_num_sg = attr->max_fast_reg_page_list_len; |
|
|
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sg_tablesize = DIV_ROUND_UP(max_sectors * SECTOR_SIZE, SZ_4K); |
|
sup_sg_tablesize = min_t(uint, ISCSI_ISER_MAX_SG_TABLESIZE, |
|
max_num_sg - reserved_mr_pages); |
|
iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize); |
|
iser_conn->pages_per_mr = |
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iser_conn->scsi_sg_tablesize + reserved_mr_pages; |
|
} |
|
|
|
/* |
|
* 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->ib_device->attrs.device_cap_flags & |
|
IB_DEVICE_INTEGRITY_HANDOVER)) { |
|
iser_warn("T10-PI requested but not supported on %s, " |
|
"continue without T10-PI\n", |
|
dev_name(&ib_conn->device->ib_device->dev)); |
|
ib_conn->pi_support = false; |
|
} else { |
|
ib_conn->pi_support = true; |
|
} |
|
} |
|
|
|
iser_calc_scsi_params(iser_conn, iser_max_sectors); |
|
|
|
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 ib_device *ib_dev = ib_conn->device->ib_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 = ib_dev->attrs.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_SUP; |
|
if (!iser_always_reg) |
|
req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP; |
|
conn_param.private_data = (void *)&req_hdr; |
|
conn_param.private_data_len = sizeof(struct iser_cm_hdr); |
|
|
|
ret = rdma_connect_locked(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, |
|
const void *private_data) |
|
{ |
|
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); |
|
|
|
if (private_data) { |
|
u8 flags = *(u8 *)private_data; |
|
|
|
iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP); |
|
} |
|
|
|
iser_info("conn %p: negotiated %s invalidation\n", |
|
iser_conn, iser_conn->snd_w_inv ? "remote" : "local"); |
|
|
|
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("%s (%d): status %d conn %p id %p\n", |
|
rdma_event_msg(event->event), 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, event->param.conn.private_data); |
|
break; |
|
case RDMA_CM_EVENT_REJECTED: |
|
iser_info("Connection rejected: %s\n", |
|
rdma_reject_msg(cma_id, event->status)); |
|
fallthrough; |
|
case RDMA_CM_EVENT_ADDR_ERROR: |
|
case RDMA_CM_EVENT_ROUTE_ERROR: |
|
case RDMA_CM_EVENT_CONNECT_ERROR: |
|
case RDMA_CM_EVENT_UNREACHABLE: |
|
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: %s (%d)\n", |
|
rdma_event_msg(event->event), event->event); |
|
break; |
|
} |
|
mutex_unlock(&iser_conn->state_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
void iser_conn_init(struct iser_conn *iser_conn) |
|
{ |
|
struct ib_conn *ib_conn = &iser_conn->ib_conn; |
|
|
|
iser_conn->state = ISER_CONN_INIT; |
|
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); |
|
mutex_init(&iser_conn->state_mutex); |
|
|
|
ib_conn->post_recv_buf_count = 0; |
|
ib_conn->reg_cqe.done = iser_reg_comp; |
|
} |
|
|
|
/** |
|
* 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->cma_id = rdma_create_id(&init_net, 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_conn *ib_conn = &iser_conn->ib_conn; |
|
struct iser_login_desc *desc = &iser_conn->login_desc; |
|
struct ib_recv_wr wr; |
|
int ib_ret; |
|
|
|
desc->sge.addr = desc->rsp_dma; |
|
desc->sge.length = ISER_RX_LOGIN_SIZE; |
|
desc->sge.lkey = ib_conn->device->pd->local_dma_lkey; |
|
|
|
desc->cqe.done = iser_login_rsp; |
|
wr.wr_cqe = &desc->cqe; |
|
wr.sg_list = &desc->sge; |
|
wr.num_sge = 1; |
|
wr.next = NULL; |
|
|
|
ib_conn->post_recv_buf_count++; |
|
ib_ret = ib_post_recv(ib_conn->qp, &wr, NULL); |
|
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_conn *ib_conn = &iser_conn->ib_conn; |
|
unsigned int my_rx_head = iser_conn->rx_desc_head; |
|
struct iser_rx_desc *rx_desc; |
|
struct ib_recv_wr *wr; |
|
int i, ib_ret; |
|
|
|
for (wr = ib_conn->rx_wr, i = 0; i < count; i++, wr++) { |
|
rx_desc = &iser_conn->rx_descs[my_rx_head]; |
|
rx_desc->cqe.done = iser_task_rsp; |
|
wr->wr_cqe = &rx_desc->cqe; |
|
wr->sg_list = &rx_desc->rx_sg; |
|
wr->num_sge = 1; |
|
wr->next = wr + 1; |
|
my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask; |
|
} |
|
|
|
wr--; |
|
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, NULL); |
|
if (unlikely(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_post_send - Initiate a Send DTO operation |
|
* @ib_conn: connection RDMA resources |
|
* @tx_desc: iSER TX descriptor |
|
* @signal: true to send work request as SIGNALED |
|
* |
|
* Return: 0 on success, -1 on failure |
|
*/ |
|
int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, |
|
bool signal) |
|
{ |
|
struct ib_send_wr *wr = &tx_desc->send_wr; |
|
struct ib_send_wr *first_wr; |
|
int ib_ret; |
|
|
|
ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
|
tx_desc->dma_addr, ISER_HEADERS_LEN, |
|
DMA_TO_DEVICE); |
|
|
|
wr->next = NULL; |
|
wr->wr_cqe = &tx_desc->cqe; |
|
wr->sg_list = tx_desc->tx_sg; |
|
wr->num_sge = tx_desc->num_sge; |
|
wr->opcode = IB_WR_SEND; |
|
wr->send_flags = signal ? IB_SEND_SIGNALED : 0; |
|
|
|
if (tx_desc->inv_wr.next) |
|
first_wr = &tx_desc->inv_wr; |
|
else if (tx_desc->reg_wr.wr.next) |
|
first_wr = &tx_desc->reg_wr.wr; |
|
else |
|
first_wr = wr; |
|
|
|
ib_ret = ib_post_send(ib_conn->qp, first_wr, NULL); |
|
if (unlikely(ib_ret)) |
|
iser_err("ib_post_send failed, ret:%d opcode:%d\n", |
|
ib_ret, wr->opcode); |
|
|
|
return ib_ret; |
|
} |
|
|
|
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 iser_fr_desc *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->sig_protected) { |
|
desc->sig_protected = false; |
|
ret = ib_check_mr_status(desc->rsc.sig_mr, |
|
IB_MR_CHECK_SIG_STATUS, &mr_status); |
|
if (ret) { |
|
iser_err("ib_check_mr_status failed, ret %d\n", ret); |
|
/* Not a lot we can do, return ambiguous guard error */ |
|
*sector = 0; |
|
return 0x1; |
|
} |
|
|
|
if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { |
|
sector_t sector_off = mr_status.sig_err.sig_err_offset; |
|
|
|
sector_div(sector_off, sector_size + 8); |
|
*sector = scsi_get_lba(iser_task->sc) + sector_off; |
|
|
|
iser_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; |
|
} |
|
|
|
void iser_err_comp(struct ib_wc *wc, const char *type) |
|
{ |
|
if (wc->status != IB_WC_WR_FLUSH_ERR) { |
|
struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context); |
|
|
|
iser_err("%s failure: %s (%d) vend_err %#x\n", type, |
|
ib_wc_status_msg(wc->status), wc->status, |
|
wc->vendor_err); |
|
|
|
if (iser_conn->iscsi_conn) |
|
iscsi_conn_failure(iser_conn->iscsi_conn, |
|
ISCSI_ERR_CONN_FAILED); |
|
} else { |
|
iser_dbg("%s failure: %s (%d)\n", type, |
|
ib_wc_status_msg(wc->status), wc->status); |
|
} |
|
}
|
|
|