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IB/iser: iSER RDMA CM (CMA) and IB verbs interaction
This file contains the low level interaction with the RDMA CM and the IB verbs, where iSER is consumer of both. Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Or Gerlitz
Roland Dreier
parent
e85b24b5e7
commit
1cfa0a75db
1 changed files with 827 additions and 0 deletions
827
drivers/infiniband/ulp/iser/iser_verbs.c
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827
drivers/infiniband/ulp/iser/iser_verbs.c
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@ -0,0 +1,827 @@
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/*
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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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*
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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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* $Id: iser_verbs.c 7051 2006-05-10 12:29:11Z ogerlitz $
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*/
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#include <asm/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/smp_lock.h>
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#include <linux/delay.h>
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#include <linux/version.h>
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#include "iscsi_iser.h"
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#define ISCSI_ISER_MAX_CONN 8
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#define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \
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ISER_QP_MAX_REQ_DTOS) * \
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ISCSI_ISER_MAX_CONN)
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static void iser_cq_tasklet_fn(unsigned long data);
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static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
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static void iser_comp_error_worker(void *data);
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static void iser_cq_event_callback(struct ib_event *cause, void *context)
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{
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iser_err("got cq event %d \n", cause->event);
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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("got qp event %d\n",cause->event);
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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 adapator.
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*
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* returns 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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device->pd = ib_alloc_pd(device->ib_device);
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if (IS_ERR(device->pd))
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goto pd_err;
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device->cq = ib_create_cq(device->ib_device,
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iser_cq_callback,
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iser_cq_event_callback,
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(void *)device,
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ISER_MAX_CQ_LEN);
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if (IS_ERR(device->cq))
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goto cq_err;
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if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP))
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goto cq_arm_err;
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tasklet_init(&device->cq_tasklet,
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iser_cq_tasklet_fn,
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(unsigned long)device);
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device->mr = ib_get_dma_mr(device->pd,
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IB_ACCESS_LOCAL_WRITE);
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if (IS_ERR(device->mr))
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goto dma_mr_err;
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return 0;
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dma_mr_err:
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tasklet_kill(&device->cq_tasklet);
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cq_arm_err:
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ib_destroy_cq(device->cq);
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cq_err:
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ib_dealloc_pd(device->pd);
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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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* iser_free_device_ib_res - destory/dealloc/dereg the DMA MR,
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* CQ and PD created with the device associated with the adapator.
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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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BUG_ON(device->mr == NULL);
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tasklet_kill(&device->cq_tasklet);
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(void)ib_dereg_mr(device->mr);
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(void)ib_destroy_cq(device->cq);
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(void)ib_dealloc_pd(device->pd);
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device->mr = NULL;
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device->cq = NULL;
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device->pd = NULL;
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}
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/**
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* iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP)
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*
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* returns 0 on success, -1 on failure
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*/
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static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
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{
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struct iser_device *device;
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struct ib_qp_init_attr init_attr;
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int ret;
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struct ib_fmr_pool_param params;
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BUG_ON(ib_conn->device == NULL);
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device = ib_conn->device;
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ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
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(sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
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GFP_KERNEL);
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if (!ib_conn->page_vec) {
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ret = -ENOMEM;
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goto alloc_err;
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}
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ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
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params.page_shift = PAGE_SHIFT;
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/* when the first/last SG element are not start/end *
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* page aligned, the map whould be of N+1 pages */
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params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
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/* make the pool size twice the max number of SCSI commands *
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* the ML is expected to queue, watermark for unmap at 50% */
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params.pool_size = ISCSI_XMIT_CMDS_MAX * 2;
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params.dirty_watermark = ISCSI_XMIT_CMDS_MAX;
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params.cache = 0;
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params.flush_function = NULL;
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params.access = (IB_ACCESS_LOCAL_WRITE |
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IB_ACCESS_REMOTE_WRITE |
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IB_ACCESS_REMOTE_READ);
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ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms);
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if (IS_ERR(ib_conn->fmr_pool)) {
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ret = PTR_ERR(ib_conn->fmr_pool);
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goto fmr_pool_err;
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}
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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 = device->cq;
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init_attr.recv_cq = device->cq;
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init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
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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 = MAX_REGD_BUF_VECTOR_LEN;
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init_attr.cap.max_recv_sge = 2;
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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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ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
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if (ret)
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goto qp_err;
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ib_conn->qp = ib_conn->cma_id->qp;
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iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
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ib_conn, ib_conn->cma_id,
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ib_conn->fmr_pool, ib_conn->cma_id->qp);
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return ret;
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qp_err:
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(void)ib_destroy_fmr_pool(ib_conn->fmr_pool);
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fmr_pool_err:
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kfree(ib_conn->page_vec);
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alloc_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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* releases the FMR pool, QP and CMA ID objects, returns 0 on success,
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* -1 on failure
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*/
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static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
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{
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BUG_ON(ib_conn == NULL);
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iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n",
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ib_conn, ib_conn->cma_id,
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ib_conn->fmr_pool, ib_conn->qp);
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/* qp is created only once both addr & route are resolved */
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if (ib_conn->fmr_pool != NULL)
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ib_destroy_fmr_pool(ib_conn->fmr_pool);
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if (ib_conn->qp != NULL)
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rdma_destroy_qp(ib_conn->cma_id);
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if (ib_conn->cma_id != NULL)
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rdma_destroy_id(ib_conn->cma_id);
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ib_conn->fmr_pool = NULL;
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ib_conn->qp = NULL;
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ib_conn->cma_id = NULL;
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kfree(ib_conn->page_vec);
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return 0;
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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 list_head *p_list;
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struct iser_device *device = NULL;
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mutex_lock(&ig.device_list_mutex);
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p_list = ig.device_list.next;
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while (p_list != &ig.device_list) {
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device = list_entry(p_list, struct iser_device, 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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break;
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}
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if (device == NULL) {
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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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}
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out:
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BUG_ON(device == NULL);
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device->refcount++;
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mutex_unlock(&ig.device_list_mutex);
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return device;
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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_err("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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int iser_conn_state_comp(struct iser_conn *ib_conn,
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enum iser_ib_conn_state comp)
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{
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int ret;
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spin_lock_bh(&ib_conn->lock);
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ret = (ib_conn->state == comp);
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spin_unlock_bh(&ib_conn->lock);
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return ret;
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}
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static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
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enum iser_ib_conn_state comp,
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enum iser_ib_conn_state exch)
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{
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int ret;
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spin_lock_bh(&ib_conn->lock);
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if ((ret = (ib_conn->state == comp)))
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ib_conn->state = exch;
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spin_unlock_bh(&ib_conn->lock);
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return ret;
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}
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/**
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* triggers start of the disconnect procedures and wait for them to be done
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*/
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void iser_conn_terminate(struct iser_conn *ib_conn)
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{
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int err = 0;
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/* change the ib conn state only if the conn is UP, however always call
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* rdma_disconnect since this is the only way to cause the CMA to change
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* the QP state to ERROR
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*/
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iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING);
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err = rdma_disconnect(ib_conn->cma_id);
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if (err)
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iser_err("Failed to disconnect, conn: 0x%p err %d\n",
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ib_conn,err);
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wait_event_interruptible(ib_conn->wait,
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ib_conn->state == ISER_CONN_DOWN);
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iser_conn_release(ib_conn);
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}
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static void iser_connect_error(struct rdma_cm_id *cma_id)
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{
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struct iser_conn *ib_conn;
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ib_conn = (struct iser_conn *)cma_id->context;
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ib_conn->state = ISER_CONN_DOWN;
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wake_up_interruptible(&ib_conn->wait);
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}
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static void iser_addr_handler(struct rdma_cm_id *cma_id)
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{
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struct iser_device *device;
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struct iser_conn *ib_conn;
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int ret;
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device = iser_device_find_by_ib_device(cma_id);
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ib_conn = (struct iser_conn *)cma_id->context;
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ib_conn->device = device;
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ret = rdma_resolve_route(cma_id, 1000);
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if (ret) {
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iser_err("resolve route failed: %d\n", ret);
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iser_connect_error(cma_id);
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}
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return;
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}
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static void iser_route_handler(struct rdma_cm_id *cma_id)
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{
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struct rdma_conn_param conn_param;
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int ret;
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ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context);
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if (ret)
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goto failure;
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iser_dbg("path.mtu is %d setting it to %d\n",
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cma_id->route.path_rec->mtu, IB_MTU_1024);
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/* we must set the MTU to 1024 as this is what the target is assuming */
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if (cma_id->route.path_rec->mtu > IB_MTU_1024)
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cma_id->route.path_rec->mtu = IB_MTU_1024;
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|
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memset(&conn_param, 0, sizeof conn_param);
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conn_param.responder_resources = 4;
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conn_param.initiator_depth = 1;
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conn_param.retry_count = 7;
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conn_param.rnr_retry_count = 6;
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|
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ret = rdma_connect(cma_id, &conn_param);
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if (ret) {
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iser_err("failure connecting: %d\n", ret);
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goto failure;
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}
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|
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return;
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failure:
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iser_connect_error(cma_id);
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}
|
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static void iser_connected_handler(struct rdma_cm_id *cma_id)
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{
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struct iser_conn *ib_conn;
|
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|
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ib_conn = (struct iser_conn *)cma_id->context;
|
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ib_conn->state = ISER_CONN_UP;
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wake_up_interruptible(&ib_conn->wait);
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}
|
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|
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static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
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{
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struct iser_conn *ib_conn;
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|
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ib_conn = (struct iser_conn *)cma_id->context;
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ib_conn->disc_evt_flag = 1;
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|
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/* getting here when the state is UP means that the conn is being *
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* terminated asynchronously from the iSCSI layer's perspective. */
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if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
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ISER_CONN_TERMINATING))
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iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
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ISCSI_ERR_CONN_FAILED);
|
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|
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/* Complete the termination process if no posts are pending */
|
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if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) &&
|
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(atomic_read(&ib_conn->post_send_buf_count) == 0)) {
|
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ib_conn->state = ISER_CONN_DOWN;
|
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wake_up_interruptible(&ib_conn->wait);
|
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}
|
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}
|
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|
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static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
|
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{
|
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int ret = 0;
|
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|
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iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id);
|
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|
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switch (event->event) {
|
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case RDMA_CM_EVENT_ADDR_RESOLVED:
|
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iser_addr_handler(cma_id);
|
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break;
|
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case RDMA_CM_EVENT_ROUTE_RESOLVED:
|
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iser_route_handler(cma_id);
|
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break;
|
||||
case RDMA_CM_EVENT_ESTABLISHED:
|
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iser_connected_handler(cma_id);
|
||||
break;
|
||||
case RDMA_CM_EVENT_ADDR_ERROR:
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||||
case RDMA_CM_EVENT_ROUTE_ERROR:
|
||||
case RDMA_CM_EVENT_CONNECT_ERROR:
|
||||
case RDMA_CM_EVENT_UNREACHABLE:
|
||||
case RDMA_CM_EVENT_REJECTED:
|
||||
iser_err("event: %d, error: %d\n", event->event, event->status);
|
||||
iser_connect_error(cma_id);
|
||||
break;
|
||||
case RDMA_CM_EVENT_DISCONNECTED:
|
||||
iser_disconnected_handler(cma_id);
|
||||
break;
|
||||
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
||||
BUG();
|
||||
break;
|
||||
case RDMA_CM_EVENT_CONNECT_RESPONSE:
|
||||
BUG();
|
||||
break;
|
||||
case RDMA_CM_EVENT_CONNECT_REQUEST:
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int iser_conn_init(struct iser_conn **ibconn)
|
||||
{
|
||||
struct iser_conn *ib_conn;
|
||||
|
||||
ib_conn = kzalloc(sizeof *ib_conn, GFP_KERNEL);
|
||||
if (!ib_conn) {
|
||||
iser_err("can't alloc memory for struct iser_conn\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
ib_conn->state = ISER_CONN_INIT;
|
||||
init_waitqueue_head(&ib_conn->wait);
|
||||
atomic_set(&ib_conn->post_recv_buf_count, 0);
|
||||
atomic_set(&ib_conn->post_send_buf_count, 0);
|
||||
INIT_WORK(&ib_conn->comperror_work, iser_comp_error_worker,
|
||||
ib_conn);
|
||||
INIT_LIST_HEAD(&ib_conn->conn_list);
|
||||
spin_lock_init(&ib_conn->lock);
|
||||
|
||||
*ibconn = ib_conn;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* starts the process of connecting to the target
|
||||
* sleeps untill the connection is established or rejected
|
||||
*/
|
||||
int iser_connect(struct iser_conn *ib_conn,
|
||||
struct sockaddr_in *src_addr,
|
||||
struct sockaddr_in *dst_addr,
|
||||
int non_blocking)
|
||||
{
|
||||
struct sockaddr *src, *dst;
|
||||
int err = 0;
|
||||
|
||||
sprintf(ib_conn->name,"%d.%d.%d.%d:%d",
|
||||
NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port);
|
||||
|
||||
/* the device is known only --after-- address resolution */
|
||||
ib_conn->device = NULL;
|
||||
|
||||
iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n",
|
||||
NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port);
|
||||
|
||||
ib_conn->state = ISER_CONN_PENDING;
|
||||
|
||||
ib_conn->cma_id = rdma_create_id(iser_cma_handler,
|
||||
(void *)ib_conn,
|
||||
RDMA_PS_TCP);
|
||||
if (IS_ERR(ib_conn->cma_id)) {
|
||||
err = PTR_ERR(ib_conn->cma_id);
|
||||
iser_err("rdma_create_id failed: %d\n", err);
|
||||
goto id_failure;
|
||||
}
|
||||
|
||||
src = (struct sockaddr *)src_addr;
|
||||
dst = (struct sockaddr *)dst_addr;
|
||||
err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000);
|
||||
if (err) {
|
||||
iser_err("rdma_resolve_addr failed: %d\n", err);
|
||||
goto addr_failure;
|
||||
}
|
||||
|
||||
if (!non_blocking) {
|
||||
wait_event_interruptible(ib_conn->wait,
|
||||
(ib_conn->state != ISER_CONN_PENDING));
|
||||
|
||||
if (ib_conn->state != ISER_CONN_UP) {
|
||||
err = -EIO;
|
||||
goto connect_failure;
|
||||
}
|
||||
}
|
||||
|
||||
mutex_lock(&ig.connlist_mutex);
|
||||
list_add(&ib_conn->conn_list, &ig.connlist);
|
||||
mutex_unlock(&ig.connlist_mutex);
|
||||
return 0;
|
||||
|
||||
id_failure:
|
||||
ib_conn->cma_id = NULL;
|
||||
addr_failure:
|
||||
ib_conn->state = ISER_CONN_DOWN;
|
||||
connect_failure:
|
||||
iser_conn_release(ib_conn);
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* Frees all conn objects and deallocs conn descriptor
|
||||
*/
|
||||
void iser_conn_release(struct iser_conn *ib_conn)
|
||||
{
|
||||
struct iser_device *device = ib_conn->device;
|
||||
|
||||
BUG_ON(ib_conn->state != ISER_CONN_DOWN);
|
||||
|
||||
mutex_lock(&ig.connlist_mutex);
|
||||
list_del(&ib_conn->conn_list);
|
||||
mutex_unlock(&ig.connlist_mutex);
|
||||
|
||||
iser_free_ib_conn_res(ib_conn);
|
||||
ib_conn->device = NULL;
|
||||
/* on EVENT_ADDR_ERROR there's no device yet for this conn */
|
||||
if (device != NULL)
|
||||
iser_device_try_release(device);
|
||||
kfree(ib_conn);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* iser_reg_page_vec - Register physical memory
|
||||
*
|
||||
* returns: 0 on success, errno code on failure
|
||||
*/
|
||||
int iser_reg_page_vec(struct iser_conn *ib_conn,
|
||||
struct iser_page_vec *page_vec,
|
||||
struct iser_mem_reg *mem_reg)
|
||||
{
|
||||
struct ib_pool_fmr *mem;
|
||||
u64 io_addr;
|
||||
u64 *page_list;
|
||||
int status;
|
||||
|
||||
page_list = page_vec->pages;
|
||||
io_addr = page_list[0];
|
||||
|
||||
mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
|
||||
page_list,
|
||||
page_vec->length,
|
||||
&io_addr);
|
||||
|
||||
if (IS_ERR(mem)) {
|
||||
status = (int)PTR_ERR(mem);
|
||||
iser_err("ib_fmr_pool_map_phys failed: %d\n", status);
|
||||
return status;
|
||||
}
|
||||
|
||||
mem_reg->lkey = mem->fmr->lkey;
|
||||
mem_reg->rkey = mem->fmr->rkey;
|
||||
mem_reg->len = page_vec->length * PAGE_SIZE;
|
||||
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) memory.
|
||||
*/
|
||||
void iser_unreg_mem(struct iser_mem_reg *reg)
|
||||
{
|
||||
int ret;
|
||||
|
||||
iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h);
|
||||
|
||||
ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
|
||||
if (ret)
|
||||
iser_err("ib_fmr_pool_unmap failed %d\n", ret);
|
||||
|
||||
reg->mem_h = NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_dto_to_iov - builds IOV from a dto descriptor
|
||||
*/
|
||||
static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len)
|
||||
{
|
||||
int i;
|
||||
struct ib_sge *sge;
|
||||
struct iser_regd_buf *regd_buf;
|
||||
|
||||
if (dto->regd_vector_len > iov_len) {
|
||||
iser_err("iov size %d too small for posting dto of len %d\n",
|
||||
iov_len, dto->regd_vector_len);
|
||||
BUG();
|
||||
}
|
||||
|
||||
for (i = 0; i < dto->regd_vector_len; i++) {
|
||||
sge = &iov[i];
|
||||
regd_buf = dto->regd[i];
|
||||
|
||||
sge->addr = regd_buf->reg.va;
|
||||
sge->length = regd_buf->reg.len;
|
||||
sge->lkey = regd_buf->reg.lkey;
|
||||
|
||||
if (dto->used_sz[i] > 0) /* Adjust size */
|
||||
sge->length = dto->used_sz[i];
|
||||
|
||||
/* offset and length should not exceed the regd buf length */
|
||||
if (sge->length + dto->offset[i] > regd_buf->reg.len) {
|
||||
iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:"
|
||||
"%ld in dto:0x%p [%d], va:0x%08lX\n",
|
||||
(unsigned long)sge->length, dto->offset[i],
|
||||
(unsigned long)regd_buf->reg.len, dto, i,
|
||||
(unsigned long)sge->addr);
|
||||
BUG();
|
||||
}
|
||||
|
||||
sge->addr += dto->offset[i]; /* Adjust offset */
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_post_recv - Posts a receive buffer.
|
||||
*
|
||||
* returns 0 on success, -1 on failure
|
||||
*/
|
||||
int iser_post_recv(struct iser_desc *rx_desc)
|
||||
{
|
||||
int ib_ret, ret_val = 0;
|
||||
struct ib_recv_wr recv_wr, *recv_wr_failed;
|
||||
struct ib_sge iov[2];
|
||||
struct iser_conn *ib_conn;
|
||||
struct iser_dto *recv_dto = &rx_desc->dto;
|
||||
|
||||
/* Retrieve conn */
|
||||
ib_conn = recv_dto->conn->ib_conn;
|
||||
|
||||
iser_dto_to_iov(recv_dto, iov, 2);
|
||||
|
||||
recv_wr.next = NULL;
|
||||
recv_wr.sg_list = iov;
|
||||
recv_wr.num_sge = recv_dto->regd_vector_len;
|
||||
recv_wr.wr_id = (unsigned long)rx_desc;
|
||||
|
||||
atomic_inc(&ib_conn->post_recv_buf_count);
|
||||
ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed);
|
||||
if (ib_ret) {
|
||||
iser_err("ib_post_recv failed ret=%d\n", ib_ret);
|
||||
atomic_dec(&ib_conn->post_recv_buf_count);
|
||||
ret_val = -1;
|
||||
}
|
||||
|
||||
return ret_val;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_start_send - Initiate a Send DTO operation
|
||||
*
|
||||
* returns 0 on success, -1 on failure
|
||||
*/
|
||||
int iser_post_send(struct iser_desc *tx_desc)
|
||||
{
|
||||
int ib_ret, ret_val = 0;
|
||||
struct ib_send_wr send_wr, *send_wr_failed;
|
||||
struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN];
|
||||
struct iser_conn *ib_conn;
|
||||
struct iser_dto *dto = &tx_desc->dto;
|
||||
|
||||
ib_conn = dto->conn->ib_conn;
|
||||
|
||||
iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN);
|
||||
|
||||
send_wr.next = NULL;
|
||||
send_wr.wr_id = (unsigned long)tx_desc;
|
||||
send_wr.sg_list = iov;
|
||||
send_wr.num_sge = dto->regd_vector_len;
|
||||
send_wr.opcode = IB_WR_SEND;
|
||||
send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0;
|
||||
|
||||
atomic_inc(&ib_conn->post_send_buf_count);
|
||||
|
||||
ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
|
||||
if (ib_ret) {
|
||||
iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n",
|
||||
dto, dto->regd_vector_len);
|
||||
iser_err("ib_post_send failed, ret:%d\n", ib_ret);
|
||||
atomic_dec(&ib_conn->post_send_buf_count);
|
||||
ret_val = -1;
|
||||
}
|
||||
|
||||
return ret_val;
|
||||
}
|
||||
|
||||
static void iser_comp_error_worker(void *data)
|
||||
{
|
||||
struct iser_conn *ib_conn = data;
|
||||
|
||||
/* getting here when the state is UP means that the conn is being *
|
||||
* terminated asynchronously from the iSCSI layer's perspective. */
|
||||
if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
|
||||
ISER_CONN_TERMINATING))
|
||||
iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
|
||||
ISCSI_ERR_CONN_FAILED);
|
||||
|
||||
/* complete the termination process if disconnect event was delivered *
|
||||
* note there are no more non completed posts to the QP */
|
||||
if (ib_conn->disc_evt_flag) {
|
||||
ib_conn->state = ISER_CONN_DOWN;
|
||||
wake_up_interruptible(&ib_conn->wait);
|
||||
}
|
||||
}
|
||||
|
||||
static void iser_handle_comp_error(struct iser_desc *desc)
|
||||
{
|
||||
struct iser_dto *dto = &desc->dto;
|
||||
struct iser_conn *ib_conn = dto->conn->ib_conn;
|
||||
|
||||
iser_dto_buffs_release(dto);
|
||||
|
||||
if (desc->type == ISCSI_RX) {
|
||||
kfree(desc->data);
|
||||
kmem_cache_free(ig.desc_cache, desc);
|
||||
atomic_dec(&ib_conn->post_recv_buf_count);
|
||||
} else { /* type is TX control/command/dataout */
|
||||
if (desc->type == ISCSI_TX_DATAOUT)
|
||||
kmem_cache_free(ig.desc_cache, desc);
|
||||
atomic_dec(&ib_conn->post_send_buf_count);
|
||||
}
|
||||
|
||||
if (atomic_read(&ib_conn->post_recv_buf_count) == 0 &&
|
||||
atomic_read(&ib_conn->post_send_buf_count) == 0)
|
||||
schedule_work(&ib_conn->comperror_work);
|
||||
}
|
||||
|
||||
static void iser_cq_tasklet_fn(unsigned long data)
|
||||
{
|
||||
struct iser_device *device = (struct iser_device *)data;
|
||||
struct ib_cq *cq = device->cq;
|
||||
struct ib_wc wc;
|
||||
struct iser_desc *desc;
|
||||
unsigned long xfer_len;
|
||||
|
||||
while (ib_poll_cq(cq, 1, &wc) == 1) {
|
||||
desc = (struct iser_desc *) (unsigned long) wc.wr_id;
|
||||
BUG_ON(desc == NULL);
|
||||
|
||||
if (wc.status == IB_WC_SUCCESS) {
|
||||
if (desc->type == ISCSI_RX) {
|
||||
xfer_len = (unsigned long)wc.byte_len;
|
||||
iser_rcv_completion(desc, xfer_len);
|
||||
} else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */
|
||||
iser_snd_completion(desc);
|
||||
} else {
|
||||
iser_err("comp w. error op %d status %d\n",desc->type,wc.status);
|
||||
iser_handle_comp_error(desc);
|
||||
}
|
||||
}
|
||||
/* #warning "it is assumed here that arming CQ only once its empty" *
|
||||
* " would not cause interrupts to be missed" */
|
||||
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
|
||||
}
|
||||
|
||||
static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
|
||||
{
|
||||
struct iser_device *device = (struct iser_device *)cq_context;
|
||||
|
||||
tasklet_schedule(&device->cq_tasklet);
|
||||
}
|
||||
Loading…
Reference in a new issue