1161 lines
33 KiB
C
1161 lines
33 KiB
C
/*
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* Copyright (c) 2005-2007 Network Appliance, Inc. 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 BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following 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 provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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#include <linux/sunrpc/svc_xprt.h>
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#include <linux/sunrpc/debug.h>
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#include <linux/sunrpc/rpc_rdma.h>
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#include <linux/spinlock.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <linux/sunrpc/svc_rdma.h>
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT
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static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
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struct sockaddr *sa, int salen,
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int flags);
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static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt);
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static void svc_rdma_release_rqst(struct svc_rqst *);
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static void dto_tasklet_func(unsigned long data);
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static void svc_rdma_detach(struct svc_xprt *xprt);
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static void svc_rdma_free(struct svc_xprt *xprt);
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static int svc_rdma_has_wspace(struct svc_xprt *xprt);
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static void rq_cq_reap(struct svcxprt_rdma *xprt);
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static void sq_cq_reap(struct svcxprt_rdma *xprt);
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DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL);
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static DEFINE_SPINLOCK(dto_lock);
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static LIST_HEAD(dto_xprt_q);
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static struct svc_xprt_ops svc_rdma_ops = {
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.xpo_create = svc_rdma_create,
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.xpo_recvfrom = svc_rdma_recvfrom,
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.xpo_sendto = svc_rdma_sendto,
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.xpo_release_rqst = svc_rdma_release_rqst,
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.xpo_detach = svc_rdma_detach,
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.xpo_free = svc_rdma_free,
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.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
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.xpo_has_wspace = svc_rdma_has_wspace,
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.xpo_accept = svc_rdma_accept,
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};
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struct svc_xprt_class svc_rdma_class = {
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.xcl_name = "rdma",
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.xcl_owner = THIS_MODULE,
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.xcl_ops = &svc_rdma_ops,
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.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
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};
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static int rdma_bump_context_cache(struct svcxprt_rdma *xprt)
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{
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int target;
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int at_least_one = 0;
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struct svc_rdma_op_ctxt *ctxt;
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target = min(xprt->sc_ctxt_cnt + xprt->sc_ctxt_bump,
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xprt->sc_ctxt_max);
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spin_lock_bh(&xprt->sc_ctxt_lock);
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while (xprt->sc_ctxt_cnt < target) {
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xprt->sc_ctxt_cnt++;
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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ctxt = kmalloc(sizeof(*ctxt), GFP_KERNEL);
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spin_lock_bh(&xprt->sc_ctxt_lock);
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if (ctxt) {
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at_least_one = 1;
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INIT_LIST_HEAD(&ctxt->free_list);
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list_add(&ctxt->free_list, &xprt->sc_ctxt_free);
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} else {
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/* kmalloc failed...give up for now */
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xprt->sc_ctxt_cnt--;
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break;
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}
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}
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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dprintk("svcrdma: sc_ctxt_max=%d, sc_ctxt_cnt=%d\n",
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xprt->sc_ctxt_max, xprt->sc_ctxt_cnt);
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return at_least_one;
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}
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struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
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{
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struct svc_rdma_op_ctxt *ctxt;
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while (1) {
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spin_lock_bh(&xprt->sc_ctxt_lock);
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if (unlikely(list_empty(&xprt->sc_ctxt_free))) {
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/* Try to bump my cache. */
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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if (rdma_bump_context_cache(xprt))
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continue;
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printk(KERN_INFO "svcrdma: sleeping waiting for "
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"context memory on xprt=%p\n",
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xprt);
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schedule_timeout_uninterruptible(msecs_to_jiffies(500));
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continue;
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}
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ctxt = list_entry(xprt->sc_ctxt_free.next,
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struct svc_rdma_op_ctxt,
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free_list);
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list_del_init(&ctxt->free_list);
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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ctxt->xprt = xprt;
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INIT_LIST_HEAD(&ctxt->dto_q);
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ctxt->count = 0;
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atomic_inc(&xprt->sc_ctxt_used);
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break;
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}
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return ctxt;
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}
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void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
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{
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struct svcxprt_rdma *xprt;
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int i;
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BUG_ON(!ctxt);
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xprt = ctxt->xprt;
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if (free_pages)
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for (i = 0; i < ctxt->count; i++)
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put_page(ctxt->pages[i]);
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for (i = 0; i < ctxt->count; i++)
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ib_dma_unmap_single(xprt->sc_cm_id->device,
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ctxt->sge[i].addr,
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ctxt->sge[i].length,
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ctxt->direction);
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spin_lock_bh(&xprt->sc_ctxt_lock);
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list_add(&ctxt->free_list, &xprt->sc_ctxt_free);
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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atomic_dec(&xprt->sc_ctxt_used);
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}
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/* ib_cq event handler */
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static void cq_event_handler(struct ib_event *event, void *context)
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{
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struct svc_xprt *xprt = context;
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dprintk("svcrdma: received CQ event id=%d, context=%p\n",
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event->event, context);
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set_bit(XPT_CLOSE, &xprt->xpt_flags);
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}
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/* QP event handler */
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static void qp_event_handler(struct ib_event *event, void *context)
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{
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struct svc_xprt *xprt = context;
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switch (event->event) {
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/* These are considered benign events */
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case IB_EVENT_PATH_MIG:
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case IB_EVENT_COMM_EST:
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case IB_EVENT_SQ_DRAINED:
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case IB_EVENT_QP_LAST_WQE_REACHED:
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dprintk("svcrdma: QP event %d received for QP=%p\n",
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event->event, event->element.qp);
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break;
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/* These are considered fatal events */
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case IB_EVENT_PATH_MIG_ERR:
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case IB_EVENT_QP_FATAL:
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case IB_EVENT_QP_REQ_ERR:
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case IB_EVENT_QP_ACCESS_ERR:
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case IB_EVENT_DEVICE_FATAL:
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default:
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dprintk("svcrdma: QP ERROR event %d received for QP=%p, "
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"closing transport\n",
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event->event, event->element.qp);
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set_bit(XPT_CLOSE, &xprt->xpt_flags);
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break;
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}
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}
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/*
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* Data Transfer Operation Tasklet
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*
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* Walks a list of transports with I/O pending, removing entries as
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* they are added to the server's I/O pending list. Two bits indicate
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* if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave
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* spinlock that serializes access to the transport list with the RQ
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* and SQ interrupt handlers.
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*/
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static void dto_tasklet_func(unsigned long data)
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{
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struct svcxprt_rdma *xprt;
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unsigned long flags;
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spin_lock_irqsave(&dto_lock, flags);
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while (!list_empty(&dto_xprt_q)) {
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xprt = list_entry(dto_xprt_q.next,
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struct svcxprt_rdma, sc_dto_q);
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list_del_init(&xprt->sc_dto_q);
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spin_unlock_irqrestore(&dto_lock, flags);
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rq_cq_reap(xprt);
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sq_cq_reap(xprt);
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svc_xprt_put(&xprt->sc_xprt);
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spin_lock_irqsave(&dto_lock, flags);
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}
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spin_unlock_irqrestore(&dto_lock, flags);
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}
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/*
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* Receive Queue Completion Handler
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*
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* Since an RQ completion handler is called on interrupt context, we
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* need to defer the handling of the I/O to a tasklet
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*/
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static void rq_comp_handler(struct ib_cq *cq, void *cq_context)
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{
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struct svcxprt_rdma *xprt = cq_context;
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unsigned long flags;
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/* Guard against unconditional flush call for destroyed QP */
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if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
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return;
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/*
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* Set the bit regardless of whether or not it's on the list
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* because it may be on the list already due to an SQ
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* completion.
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*/
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set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags);
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/*
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* If this transport is not already on the DTO transport queue,
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* add it
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*/
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spin_lock_irqsave(&dto_lock, flags);
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if (list_empty(&xprt->sc_dto_q)) {
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svc_xprt_get(&xprt->sc_xprt);
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list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
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}
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spin_unlock_irqrestore(&dto_lock, flags);
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/* Tasklet does all the work to avoid irqsave locks. */
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tasklet_schedule(&dto_tasklet);
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}
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/*
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* rq_cq_reap - Process the RQ CQ.
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*
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* Take all completing WC off the CQE and enqueue the associated DTO
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* context on the dto_q for the transport.
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*
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* Note that caller must hold a transport reference.
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*/
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static void rq_cq_reap(struct svcxprt_rdma *xprt)
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{
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int ret;
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struct ib_wc wc;
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struct svc_rdma_op_ctxt *ctxt = NULL;
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if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags))
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return;
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ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP);
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atomic_inc(&rdma_stat_rq_poll);
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while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) {
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ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
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ctxt->wc_status = wc.status;
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ctxt->byte_len = wc.byte_len;
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if (wc.status != IB_WC_SUCCESS) {
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/* Close the transport */
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dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt);
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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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svc_rdma_put_context(ctxt, 1);
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svc_xprt_put(&xprt->sc_xprt);
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continue;
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}
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spin_lock_bh(&xprt->sc_rq_dto_lock);
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list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
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spin_unlock_bh(&xprt->sc_rq_dto_lock);
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svc_xprt_put(&xprt->sc_xprt);
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}
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if (ctxt)
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atomic_inc(&rdma_stat_rq_prod);
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set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
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/*
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* If data arrived before established event,
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* don't enqueue. This defers RPC I/O until the
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* RDMA connection is complete.
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*/
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if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
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svc_xprt_enqueue(&xprt->sc_xprt);
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}
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/*
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* Send Queue Completion Handler - potentially called on interrupt context.
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*
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* Note that caller must hold a transport reference.
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*/
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static void sq_cq_reap(struct svcxprt_rdma *xprt)
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{
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struct svc_rdma_op_ctxt *ctxt = NULL;
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struct ib_wc wc;
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struct ib_cq *cq = xprt->sc_sq_cq;
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int ret;
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if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags))
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return;
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ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP);
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atomic_inc(&rdma_stat_sq_poll);
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while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) {
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ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
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xprt = ctxt->xprt;
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if (wc.status != IB_WC_SUCCESS)
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/* Close the transport */
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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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/* Decrement used SQ WR count */
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atomic_dec(&xprt->sc_sq_count);
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wake_up(&xprt->sc_send_wait);
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switch (ctxt->wr_op) {
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case IB_WR_SEND:
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case IB_WR_RDMA_WRITE:
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svc_rdma_put_context(ctxt, 1);
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break;
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case IB_WR_RDMA_READ:
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if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
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struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr;
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BUG_ON(!read_hdr);
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set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
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spin_lock_bh(&xprt->sc_read_complete_lock);
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list_add_tail(&read_hdr->dto_q,
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&xprt->sc_read_complete_q);
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spin_unlock_bh(&xprt->sc_read_complete_lock);
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svc_xprt_enqueue(&xprt->sc_xprt);
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}
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svc_rdma_put_context(ctxt, 0);
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break;
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default:
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printk(KERN_ERR "svcrdma: unexpected completion type, "
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"opcode=%d, status=%d\n",
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wc.opcode, wc.status);
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break;
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}
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svc_xprt_put(&xprt->sc_xprt);
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}
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if (ctxt)
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atomic_inc(&rdma_stat_sq_prod);
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}
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static void sq_comp_handler(struct ib_cq *cq, void *cq_context)
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{
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struct svcxprt_rdma *xprt = cq_context;
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unsigned long flags;
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/* Guard against unconditional flush call for destroyed QP */
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if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
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return;
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|
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/*
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* Set the bit regardless of whether or not it's on the list
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* because it may be on the list already due to an RQ
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* completion.
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*/
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set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags);
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|
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/*
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* If this transport is not already on the DTO transport queue,
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* add it
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*/
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spin_lock_irqsave(&dto_lock, flags);
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if (list_empty(&xprt->sc_dto_q)) {
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svc_xprt_get(&xprt->sc_xprt);
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list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
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}
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spin_unlock_irqrestore(&dto_lock, flags);
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/* Tasklet does all the work to avoid irqsave locks. */
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tasklet_schedule(&dto_tasklet);
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}
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static void create_context_cache(struct svcxprt_rdma *xprt,
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int ctxt_count, int ctxt_bump, int ctxt_max)
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{
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struct svc_rdma_op_ctxt *ctxt;
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int i;
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xprt->sc_ctxt_max = ctxt_max;
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xprt->sc_ctxt_bump = ctxt_bump;
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xprt->sc_ctxt_cnt = 0;
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atomic_set(&xprt->sc_ctxt_used, 0);
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INIT_LIST_HEAD(&xprt->sc_ctxt_free);
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for (i = 0; i < ctxt_count; i++) {
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ctxt = kmalloc(sizeof(*ctxt), GFP_KERNEL);
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if (ctxt) {
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INIT_LIST_HEAD(&ctxt->free_list);
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list_add(&ctxt->free_list, &xprt->sc_ctxt_free);
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xprt->sc_ctxt_cnt++;
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}
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}
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}
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static void destroy_context_cache(struct svcxprt_rdma *xprt)
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{
|
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while (!list_empty(&xprt->sc_ctxt_free)) {
|
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struct svc_rdma_op_ctxt *ctxt;
|
|
ctxt = list_entry(xprt->sc_ctxt_free.next,
|
|
struct svc_rdma_op_ctxt,
|
|
free_list);
|
|
list_del_init(&ctxt->free_list);
|
|
kfree(ctxt);
|
|
}
|
|
}
|
|
|
|
static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
|
|
int listener)
|
|
{
|
|
struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
|
|
|
|
if (!cma_xprt)
|
|
return NULL;
|
|
svc_xprt_init(&svc_rdma_class, &cma_xprt->sc_xprt, serv);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
|
|
init_waitqueue_head(&cma_xprt->sc_send_wait);
|
|
|
|
spin_lock_init(&cma_xprt->sc_lock);
|
|
spin_lock_init(&cma_xprt->sc_read_complete_lock);
|
|
spin_lock_init(&cma_xprt->sc_ctxt_lock);
|
|
spin_lock_init(&cma_xprt->sc_rq_dto_lock);
|
|
|
|
cma_xprt->sc_ord = svcrdma_ord;
|
|
|
|
cma_xprt->sc_max_req_size = svcrdma_max_req_size;
|
|
cma_xprt->sc_max_requests = svcrdma_max_requests;
|
|
cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT;
|
|
atomic_set(&cma_xprt->sc_sq_count, 0);
|
|
|
|
if (!listener) {
|
|
int reqs = cma_xprt->sc_max_requests;
|
|
create_context_cache(cma_xprt,
|
|
reqs << 1, /* starting size */
|
|
reqs, /* bump amount */
|
|
reqs +
|
|
cma_xprt->sc_sq_depth +
|
|
RPCRDMA_MAX_THREADS + 1); /* max */
|
|
if (list_empty(&cma_xprt->sc_ctxt_free)) {
|
|
kfree(cma_xprt);
|
|
return NULL;
|
|
}
|
|
clear_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
|
|
} else
|
|
set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
|
|
|
|
return cma_xprt;
|
|
}
|
|
|
|
struct page *svc_rdma_get_page(void)
|
|
{
|
|
struct page *page;
|
|
|
|
while ((page = alloc_page(GFP_KERNEL)) == NULL) {
|
|
/* If we can't get memory, wait a bit and try again */
|
|
printk(KERN_INFO "svcrdma: out of memory...retrying in 1000 "
|
|
"jiffies.\n");
|
|
schedule_timeout_uninterruptible(msecs_to_jiffies(1000));
|
|
}
|
|
return page;
|
|
}
|
|
|
|
int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
|
|
{
|
|
struct ib_recv_wr recv_wr, *bad_recv_wr;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
struct page *page;
|
|
unsigned long pa;
|
|
int sge_no;
|
|
int buflen;
|
|
int ret;
|
|
|
|
ctxt = svc_rdma_get_context(xprt);
|
|
buflen = 0;
|
|
ctxt->direction = DMA_FROM_DEVICE;
|
|
for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
|
|
BUG_ON(sge_no >= xprt->sc_max_sge);
|
|
page = svc_rdma_get_page();
|
|
ctxt->pages[sge_no] = page;
|
|
pa = ib_dma_map_page(xprt->sc_cm_id->device,
|
|
page, 0, PAGE_SIZE,
|
|
DMA_FROM_DEVICE);
|
|
ctxt->sge[sge_no].addr = pa;
|
|
ctxt->sge[sge_no].length = PAGE_SIZE;
|
|
ctxt->sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
|
|
buflen += PAGE_SIZE;
|
|
}
|
|
ctxt->count = sge_no;
|
|
recv_wr.next = NULL;
|
|
recv_wr.sg_list = &ctxt->sge[0];
|
|
recv_wr.num_sge = ctxt->count;
|
|
recv_wr.wr_id = (u64)(unsigned long)ctxt;
|
|
|
|
svc_xprt_get(&xprt->sc_xprt);
|
|
ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
|
|
if (ret) {
|
|
svc_xprt_put(&xprt->sc_xprt);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This function handles the CONNECT_REQUEST event on a listening
|
|
* endpoint. It is passed the cma_id for the _new_ connection. The context in
|
|
* this cma_id is inherited from the listening cma_id and is the svc_xprt
|
|
* structure for the listening endpoint.
|
|
*
|
|
* This function creates a new xprt for the new connection and enqueues it on
|
|
* the accept queue for the listent xprt. When the listen thread is kicked, it
|
|
* will call the recvfrom method on the listen xprt which will accept the new
|
|
* connection.
|
|
*/
|
|
static void handle_connect_req(struct rdma_cm_id *new_cma_id)
|
|
{
|
|
struct svcxprt_rdma *listen_xprt = new_cma_id->context;
|
|
struct svcxprt_rdma *newxprt;
|
|
struct sockaddr *sa;
|
|
|
|
/* Create a new transport */
|
|
newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0);
|
|
if (!newxprt) {
|
|
dprintk("svcrdma: failed to create new transport\n");
|
|
return;
|
|
}
|
|
newxprt->sc_cm_id = new_cma_id;
|
|
new_cma_id->context = newxprt;
|
|
dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
|
|
newxprt, newxprt->sc_cm_id, listen_xprt);
|
|
|
|
/* Set the local and remote addresses in the transport */
|
|
sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
|
|
svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa));
|
|
sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
|
|
svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
|
|
|
|
/*
|
|
* Enqueue the new transport on the accept queue of the listening
|
|
* transport
|
|
*/
|
|
spin_lock_bh(&listen_xprt->sc_lock);
|
|
list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
|
|
spin_unlock_bh(&listen_xprt->sc_lock);
|
|
|
|
/*
|
|
* Can't use svc_xprt_received here because we are not on a
|
|
* rqstp thread
|
|
*/
|
|
set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&listen_xprt->sc_xprt);
|
|
}
|
|
|
|
/*
|
|
* Handles events generated on the listening endpoint. These events will be
|
|
* either be incoming connect requests or adapter removal events.
|
|
*/
|
|
static int rdma_listen_handler(struct rdma_cm_id *cma_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
struct svcxprt_rdma *xprt = cma_id->context;
|
|
int ret = 0;
|
|
|
|
switch (event->event) {
|
|
case RDMA_CM_EVENT_CONNECT_REQUEST:
|
|
dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
|
|
"event=%d\n", cma_id, cma_id->context, event->event);
|
|
handle_connect_req(cma_id);
|
|
break;
|
|
|
|
case RDMA_CM_EVENT_ESTABLISHED:
|
|
/* Accept complete */
|
|
dprintk("svcrdma: Connection completed on LISTEN xprt=%p, "
|
|
"cm_id=%p\n", xprt, cma_id);
|
|
break;
|
|
|
|
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
|
dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
|
|
xprt, cma_id);
|
|
if (xprt)
|
|
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
|
|
break;
|
|
|
|
default:
|
|
dprintk("svcrdma: Unexpected event on listening endpoint %p, "
|
|
"event=%d\n", cma_id, event->event);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rdma_cma_handler(struct rdma_cm_id *cma_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
struct svc_xprt *xprt = cma_id->context;
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
switch (event->event) {
|
|
case RDMA_CM_EVENT_ESTABLISHED:
|
|
/* Accept complete */
|
|
svc_xprt_get(xprt);
|
|
dprintk("svcrdma: Connection completed on DTO xprt=%p, "
|
|
"cm_id=%p\n", xprt, cma_id);
|
|
clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
break;
|
|
case RDMA_CM_EVENT_DISCONNECTED:
|
|
dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
|
|
xprt, cma_id);
|
|
if (xprt) {
|
|
set_bit(XPT_CLOSE, &xprt->xpt_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
svc_xprt_put(xprt);
|
|
}
|
|
break;
|
|
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
|
dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
|
|
"event=%d\n", cma_id, xprt, event->event);
|
|
if (xprt) {
|
|
set_bit(XPT_CLOSE, &xprt->xpt_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
}
|
|
break;
|
|
default:
|
|
dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
|
|
"event=%d\n", cma_id, event->event);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create a listening RDMA service endpoint.
|
|
*/
|
|
static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
|
|
struct sockaddr *sa, int salen,
|
|
int flags)
|
|
{
|
|
struct rdma_cm_id *listen_id;
|
|
struct svcxprt_rdma *cma_xprt;
|
|
struct svc_xprt *xprt;
|
|
int ret;
|
|
|
|
dprintk("svcrdma: Creating RDMA socket\n");
|
|
|
|
cma_xprt = rdma_create_xprt(serv, 1);
|
|
if (!cma_xprt)
|
|
return ERR_PTR(-ENOMEM);
|
|
xprt = &cma_xprt->sc_xprt;
|
|
|
|
listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP);
|
|
if (IS_ERR(listen_id)) {
|
|
ret = PTR_ERR(listen_id);
|
|
dprintk("svcrdma: rdma_create_id failed = %d\n", ret);
|
|
goto err0;
|
|
}
|
|
|
|
ret = rdma_bind_addr(listen_id, sa);
|
|
if (ret) {
|
|
dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret);
|
|
goto err1;
|
|
}
|
|
cma_xprt->sc_cm_id = listen_id;
|
|
|
|
ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG);
|
|
if (ret) {
|
|
dprintk("svcrdma: rdma_listen failed = %d\n", ret);
|
|
goto err1;
|
|
}
|
|
|
|
/*
|
|
* We need to use the address from the cm_id in case the
|
|
* caller specified 0 for the port number.
|
|
*/
|
|
sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr;
|
|
svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen);
|
|
|
|
return &cma_xprt->sc_xprt;
|
|
|
|
err1:
|
|
rdma_destroy_id(listen_id);
|
|
err0:
|
|
kfree(cma_xprt);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* This is the xpo_recvfrom function for listening endpoints. Its
|
|
* purpose is to accept incoming connections. The CMA callback handler
|
|
* has already created a new transport and attached it to the new CMA
|
|
* ID.
|
|
*
|
|
* There is a queue of pending connections hung on the listening
|
|
* transport. This queue contains the new svc_xprt structure. This
|
|
* function takes svc_xprt structures off the accept_q and completes
|
|
* the connection.
|
|
*/
|
|
static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *listen_rdma;
|
|
struct svcxprt_rdma *newxprt = NULL;
|
|
struct rdma_conn_param conn_param;
|
|
struct ib_qp_init_attr qp_attr;
|
|
struct ib_device_attr devattr;
|
|
int ret;
|
|
int i;
|
|
|
|
listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
clear_bit(XPT_CONN, &xprt->xpt_flags);
|
|
/* Get the next entry off the accept list */
|
|
spin_lock_bh(&listen_rdma->sc_lock);
|
|
if (!list_empty(&listen_rdma->sc_accept_q)) {
|
|
newxprt = list_entry(listen_rdma->sc_accept_q.next,
|
|
struct svcxprt_rdma, sc_accept_q);
|
|
list_del_init(&newxprt->sc_accept_q);
|
|
}
|
|
if (!list_empty(&listen_rdma->sc_accept_q))
|
|
set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
|
|
spin_unlock_bh(&listen_rdma->sc_lock);
|
|
if (!newxprt)
|
|
return NULL;
|
|
|
|
dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
|
|
newxprt, newxprt->sc_cm_id);
|
|
|
|
ret = ib_query_device(newxprt->sc_cm_id->device, &devattr);
|
|
if (ret) {
|
|
dprintk("svcrdma: could not query device attributes on "
|
|
"device %p, rc=%d\n", newxprt->sc_cm_id->device, ret);
|
|
goto errout;
|
|
}
|
|
|
|
/* Qualify the transport resource defaults with the
|
|
* capabilities of this particular device */
|
|
newxprt->sc_max_sge = min((size_t)devattr.max_sge,
|
|
(size_t)RPCSVC_MAXPAGES);
|
|
newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr,
|
|
(size_t)svcrdma_max_requests);
|
|
newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests;
|
|
|
|
newxprt->sc_ord = min((size_t)devattr.max_qp_rd_atom,
|
|
(size_t)svcrdma_ord);
|
|
|
|
newxprt->sc_pd = ib_alloc_pd(newxprt->sc_cm_id->device);
|
|
if (IS_ERR(newxprt->sc_pd)) {
|
|
dprintk("svcrdma: error creating PD for connect request\n");
|
|
goto errout;
|
|
}
|
|
newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device,
|
|
sq_comp_handler,
|
|
cq_event_handler,
|
|
newxprt,
|
|
newxprt->sc_sq_depth,
|
|
0);
|
|
if (IS_ERR(newxprt->sc_sq_cq)) {
|
|
dprintk("svcrdma: error creating SQ CQ for connect request\n");
|
|
goto errout;
|
|
}
|
|
newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device,
|
|
rq_comp_handler,
|
|
cq_event_handler,
|
|
newxprt,
|
|
newxprt->sc_max_requests,
|
|
0);
|
|
if (IS_ERR(newxprt->sc_rq_cq)) {
|
|
dprintk("svcrdma: error creating RQ CQ for connect request\n");
|
|
goto errout;
|
|
}
|
|
|
|
memset(&qp_attr, 0, sizeof qp_attr);
|
|
qp_attr.event_handler = qp_event_handler;
|
|
qp_attr.qp_context = &newxprt->sc_xprt;
|
|
qp_attr.cap.max_send_wr = newxprt->sc_sq_depth;
|
|
qp_attr.cap.max_recv_wr = newxprt->sc_max_requests;
|
|
qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
|
|
qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
|
|
qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
|
qp_attr.qp_type = IB_QPT_RC;
|
|
qp_attr.send_cq = newxprt->sc_sq_cq;
|
|
qp_attr.recv_cq = newxprt->sc_rq_cq;
|
|
dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n"
|
|
" cm_id->device=%p, sc_pd->device=%p\n"
|
|
" cap.max_send_wr = %d\n"
|
|
" cap.max_recv_wr = %d\n"
|
|
" cap.max_send_sge = %d\n"
|
|
" cap.max_recv_sge = %d\n",
|
|
newxprt->sc_cm_id, newxprt->sc_pd,
|
|
newxprt->sc_cm_id->device, newxprt->sc_pd->device,
|
|
qp_attr.cap.max_send_wr,
|
|
qp_attr.cap.max_recv_wr,
|
|
qp_attr.cap.max_send_sge,
|
|
qp_attr.cap.max_recv_sge);
|
|
|
|
ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
|
|
if (ret) {
|
|
/*
|
|
* XXX: This is a hack. We need a xx_request_qp interface
|
|
* that will adjust the qp_attr's with a best-effort
|
|
* number
|
|
*/
|
|
qp_attr.cap.max_send_sge -= 2;
|
|
qp_attr.cap.max_recv_sge -= 2;
|
|
ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd,
|
|
&qp_attr);
|
|
if (ret) {
|
|
dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
|
|
goto errout;
|
|
}
|
|
newxprt->sc_max_sge = qp_attr.cap.max_send_sge;
|
|
newxprt->sc_max_sge = qp_attr.cap.max_recv_sge;
|
|
newxprt->sc_sq_depth = qp_attr.cap.max_send_wr;
|
|
newxprt->sc_max_requests = qp_attr.cap.max_recv_wr;
|
|
}
|
|
newxprt->sc_qp = newxprt->sc_cm_id->qp;
|
|
|
|
/* Register all of physical memory */
|
|
newxprt->sc_phys_mr = ib_get_dma_mr(newxprt->sc_pd,
|
|
IB_ACCESS_LOCAL_WRITE |
|
|
IB_ACCESS_REMOTE_WRITE);
|
|
if (IS_ERR(newxprt->sc_phys_mr)) {
|
|
dprintk("svcrdma: Failed to create DMA MR ret=%d\n", ret);
|
|
goto errout;
|
|
}
|
|
|
|
/* Post receive buffers */
|
|
for (i = 0; i < newxprt->sc_max_requests; i++) {
|
|
ret = svc_rdma_post_recv(newxprt);
|
|
if (ret) {
|
|
dprintk("svcrdma: failure posting receive buffers\n");
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
/* Swap out the handler */
|
|
newxprt->sc_cm_id->event_handler = rdma_cma_handler;
|
|
|
|
/*
|
|
* Arm the CQs for the SQ and RQ before accepting so we can't
|
|
* miss the first message
|
|
*/
|
|
ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP);
|
|
ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP);
|
|
|
|
/* Accept Connection */
|
|
set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
|
|
memset(&conn_param, 0, sizeof conn_param);
|
|
conn_param.responder_resources = 0;
|
|
conn_param.initiator_depth = newxprt->sc_ord;
|
|
ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
|
|
if (ret) {
|
|
dprintk("svcrdma: failed to accept new connection, ret=%d\n",
|
|
ret);
|
|
goto errout;
|
|
}
|
|
|
|
dprintk("svcrdma: new connection %p accepted with the following "
|
|
"attributes:\n"
|
|
" local_ip : %d.%d.%d.%d\n"
|
|
" local_port : %d\n"
|
|
" remote_ip : %d.%d.%d.%d\n"
|
|
" remote_port : %d\n"
|
|
" max_sge : %d\n"
|
|
" sq_depth : %d\n"
|
|
" max_requests : %d\n"
|
|
" ord : %d\n",
|
|
newxprt,
|
|
NIPQUAD(((struct sockaddr_in *)&newxprt->sc_cm_id->
|
|
route.addr.src_addr)->sin_addr.s_addr),
|
|
ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
|
|
route.addr.src_addr)->sin_port),
|
|
NIPQUAD(((struct sockaddr_in *)&newxprt->sc_cm_id->
|
|
route.addr.dst_addr)->sin_addr.s_addr),
|
|
ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
|
|
route.addr.dst_addr)->sin_port),
|
|
newxprt->sc_max_sge,
|
|
newxprt->sc_sq_depth,
|
|
newxprt->sc_max_requests,
|
|
newxprt->sc_ord);
|
|
|
|
return &newxprt->sc_xprt;
|
|
|
|
errout:
|
|
dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
|
|
/* Take a reference in case the DTO handler runs */
|
|
svc_xprt_get(&newxprt->sc_xprt);
|
|
if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
|
|
ib_destroy_qp(newxprt->sc_qp);
|
|
rdma_destroy_id(newxprt->sc_cm_id);
|
|
/* This call to put will destroy the transport */
|
|
svc_xprt_put(&newxprt->sc_xprt);
|
|
return NULL;
|
|
}
|
|
|
|
static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* When connected, an svc_xprt has at least two references:
|
|
*
|
|
* - A reference held by the cm_id between the ESTABLISHED and
|
|
* DISCONNECTED events. If the remote peer disconnected first, this
|
|
* reference could be gone.
|
|
*
|
|
* - A reference held by the svc_recv code that called this function
|
|
* as part of close processing.
|
|
*
|
|
* At a minimum one references should still be held.
|
|
*/
|
|
static void svc_rdma_detach(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
dprintk("svc: svc_rdma_detach(%p)\n", xprt);
|
|
|
|
/* Disconnect and flush posted WQE */
|
|
rdma_disconnect(rdma->sc_cm_id);
|
|
}
|
|
|
|
static void __svc_rdma_free(struct work_struct *work)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(work, struct svcxprt_rdma, sc_work);
|
|
dprintk("svcrdma: svc_rdma_free(%p)\n", rdma);
|
|
|
|
/* We should only be called from kref_put */
|
|
BUG_ON(atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0);
|
|
|
|
/*
|
|
* Destroy queued, but not processed read completions. Note
|
|
* that this cleanup has to be done before destroying the
|
|
* cm_id because the device ptr is needed to unmap the dma in
|
|
* svc_rdma_put_context.
|
|
*/
|
|
spin_lock_bh(&rdma->sc_read_complete_lock);
|
|
while (!list_empty(&rdma->sc_read_complete_q)) {
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
ctxt = list_entry(rdma->sc_read_complete_q.next,
|
|
struct svc_rdma_op_ctxt,
|
|
dto_q);
|
|
list_del_init(&ctxt->dto_q);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
spin_unlock_bh(&rdma->sc_read_complete_lock);
|
|
|
|
/* Destroy queued, but not processed recv completions */
|
|
spin_lock_bh(&rdma->sc_rq_dto_lock);
|
|
while (!list_empty(&rdma->sc_rq_dto_q)) {
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
ctxt = list_entry(rdma->sc_rq_dto_q.next,
|
|
struct svc_rdma_op_ctxt,
|
|
dto_q);
|
|
list_del_init(&ctxt->dto_q);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
spin_unlock_bh(&rdma->sc_rq_dto_lock);
|
|
|
|
/* Warn if we leaked a resource or under-referenced */
|
|
WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0);
|
|
|
|
/* Destroy the QP if present (not a listener) */
|
|
if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
|
|
ib_destroy_qp(rdma->sc_qp);
|
|
|
|
if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
|
|
ib_destroy_cq(rdma->sc_sq_cq);
|
|
|
|
if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
|
|
ib_destroy_cq(rdma->sc_rq_cq);
|
|
|
|
if (rdma->sc_phys_mr && !IS_ERR(rdma->sc_phys_mr))
|
|
ib_dereg_mr(rdma->sc_phys_mr);
|
|
|
|
if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
|
|
ib_dealloc_pd(rdma->sc_pd);
|
|
|
|
/* Destroy the CM ID */
|
|
rdma_destroy_id(rdma->sc_cm_id);
|
|
|
|
destroy_context_cache(rdma);
|
|
kfree(rdma);
|
|
}
|
|
|
|
static void svc_rdma_free(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
INIT_WORK(&rdma->sc_work, __svc_rdma_free);
|
|
schedule_work(&rdma->sc_work);
|
|
}
|
|
|
|
static int svc_rdma_has_wspace(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
|
|
/*
|
|
* If there are fewer SQ WR available than required to send a
|
|
* simple response, return false.
|
|
*/
|
|
if ((rdma->sc_sq_depth - atomic_read(&rdma->sc_sq_count) < 3))
|
|
return 0;
|
|
|
|
/*
|
|
* ...or there are already waiters on the SQ,
|
|
* return false.
|
|
*/
|
|
if (waitqueue_active(&rdma->sc_send_wait))
|
|
return 0;
|
|
|
|
/* Otherwise return true. */
|
|
return 1;
|
|
}
|
|
|
|
int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
|
|
{
|
|
struct ib_send_wr *bad_wr;
|
|
int ret;
|
|
|
|
if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
|
|
return -ENOTCONN;
|
|
|
|
BUG_ON(wr->send_flags != IB_SEND_SIGNALED);
|
|
BUG_ON(((struct svc_rdma_op_ctxt *)(unsigned long)wr->wr_id)->wr_op !=
|
|
wr->opcode);
|
|
/* If the SQ is full, wait until an SQ entry is available */
|
|
while (1) {
|
|
spin_lock_bh(&xprt->sc_lock);
|
|
if (xprt->sc_sq_depth == atomic_read(&xprt->sc_sq_count)) {
|
|
spin_unlock_bh(&xprt->sc_lock);
|
|
atomic_inc(&rdma_stat_sq_starve);
|
|
|
|
/* See if we can opportunistically reap SQ WR to make room */
|
|
sq_cq_reap(xprt);
|
|
|
|
/* Wait until SQ WR available if SQ still full */
|
|
wait_event(xprt->sc_send_wait,
|
|
atomic_read(&xprt->sc_sq_count) <
|
|
xprt->sc_sq_depth);
|
|
if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
|
|
return 0;
|
|
continue;
|
|
}
|
|
/* Bumped used SQ WR count and post */
|
|
svc_xprt_get(&xprt->sc_xprt);
|
|
ret = ib_post_send(xprt->sc_qp, wr, &bad_wr);
|
|
if (!ret)
|
|
atomic_inc(&xprt->sc_sq_count);
|
|
else {
|
|
svc_xprt_put(&xprt->sc_xprt);
|
|
dprintk("svcrdma: failed to post SQ WR rc=%d, "
|
|
"sc_sq_count=%d, sc_sq_depth=%d\n",
|
|
ret, atomic_read(&xprt->sc_sq_count),
|
|
xprt->sc_sq_depth);
|
|
}
|
|
spin_unlock_bh(&xprt->sc_lock);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
|
|
enum rpcrdma_errcode err)
|
|
{
|
|
struct ib_send_wr err_wr;
|
|
struct ib_sge sge;
|
|
struct page *p;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
u32 *va;
|
|
int length;
|
|
int ret;
|
|
|
|
p = svc_rdma_get_page();
|
|
va = page_address(p);
|
|
|
|
/* XDR encode error */
|
|
length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
|
|
|
|
/* Prepare SGE for local address */
|
|
sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
|
|
p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
|
|
sge.lkey = xprt->sc_phys_mr->lkey;
|
|
sge.length = length;
|
|
|
|
ctxt = svc_rdma_get_context(xprt);
|
|
ctxt->count = 1;
|
|
ctxt->pages[0] = p;
|
|
|
|
/* Prepare SEND WR */
|
|
memset(&err_wr, 0, sizeof err_wr);
|
|
ctxt->wr_op = IB_WR_SEND;
|
|
err_wr.wr_id = (unsigned long)ctxt;
|
|
err_wr.sg_list = &sge;
|
|
err_wr.num_sge = 1;
|
|
err_wr.opcode = IB_WR_SEND;
|
|
err_wr.send_flags = IB_SEND_SIGNALED;
|
|
|
|
/* Post It */
|
|
ret = svc_rdma_send(xprt, &err_wr);
|
|
if (ret) {
|
|
dprintk("svcrdma: Error %d posting send for protocol error\n",
|
|
ret);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
}
|