1252 lines
31 KiB
C
1252 lines
31 KiB
C
/*
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* Copyright (c) 2003-2007 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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/*
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* verbs.c
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*
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* Encapsulates the major functions managing:
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* o adapters
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* o endpoints
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* o connections
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* o buffer memory
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*/
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/prefetch.h>
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#include <linux/sunrpc/addr.h>
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#include <asm/bitops.h>
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#include <linux/module.h> /* try_module_get()/module_put() */
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#include "xprt_rdma.h"
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/*
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* Globals/Macros
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*/
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_TRANS
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#endif
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/*
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* internal functions
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*/
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static struct workqueue_struct *rpcrdma_receive_wq;
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int
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rpcrdma_alloc_wq(void)
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{
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struct workqueue_struct *recv_wq;
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recv_wq = alloc_workqueue("xprtrdma_receive",
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WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_HIGHPRI,
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0);
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if (!recv_wq)
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return -ENOMEM;
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rpcrdma_receive_wq = recv_wq;
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return 0;
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}
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void
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rpcrdma_destroy_wq(void)
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{
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struct workqueue_struct *wq;
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if (rpcrdma_receive_wq) {
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wq = rpcrdma_receive_wq;
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rpcrdma_receive_wq = NULL;
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destroy_workqueue(wq);
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}
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}
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static void
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rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
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{
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struct rpcrdma_ep *ep = context;
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pr_err("RPC: %s: %s on device %s ep %p\n",
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__func__, ib_event_msg(event->event),
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event->device->name, context);
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if (ep->rep_connected == 1) {
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ep->rep_connected = -EIO;
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rpcrdma_conn_func(ep);
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wake_up_all(&ep->rep_connect_wait);
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}
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}
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/**
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* rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
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{
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/* WARNING: Only wr_cqe and status are reliable at this point */
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if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("rpcrdma: Send: %s (%u/0x%x)\n",
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ib_wc_status_msg(wc->status),
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wc->status, wc->vendor_err);
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}
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static void
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rpcrdma_receive_worker(struct work_struct *work)
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{
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struct rpcrdma_rep *rep =
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container_of(work, struct rpcrdma_rep, rr_work);
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rpcrdma_reply_handler(rep);
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}
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/* Perform basic sanity checking to avoid using garbage
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* to update the credit grant value.
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*/
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static void
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rpcrdma_update_granted_credits(struct rpcrdma_rep *rep)
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{
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struct rpcrdma_msg *rmsgp = rdmab_to_msg(rep->rr_rdmabuf);
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struct rpcrdma_buffer *buffer = &rep->rr_rxprt->rx_buf;
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u32 credits;
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if (rep->rr_len < RPCRDMA_HDRLEN_ERR)
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return;
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credits = be32_to_cpu(rmsgp->rm_credit);
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if (credits == 0)
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credits = 1; /* don't deadlock */
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else if (credits > buffer->rb_max_requests)
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credits = buffer->rb_max_requests;
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atomic_set(&buffer->rb_credits, credits);
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}
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/**
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* rpcrdma_receive_wc - Invoked by RDMA provider for each polled Receive WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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rpcrdma_receive_wc(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct ib_cqe *cqe = wc->wr_cqe;
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struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep,
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rr_cqe);
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/* WARNING: Only wr_id and status are reliable at this point */
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if (wc->status != IB_WC_SUCCESS)
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goto out_fail;
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/* status == SUCCESS means all fields in wc are trustworthy */
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if (wc->opcode != IB_WC_RECV)
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return;
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dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n",
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__func__, rep, wc->byte_len);
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rep->rr_len = wc->byte_len;
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ib_dma_sync_single_for_cpu(rep->rr_device,
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rdmab_addr(rep->rr_rdmabuf),
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rep->rr_len, DMA_FROM_DEVICE);
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rpcrdma_update_granted_credits(rep);
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out_schedule:
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queue_work(rpcrdma_receive_wq, &rep->rr_work);
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return;
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out_fail:
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if (wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("rpcrdma: Recv: %s (%u/0x%x)\n",
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ib_wc_status_msg(wc->status),
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wc->status, wc->vendor_err);
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rep->rr_len = RPCRDMA_BAD_LEN;
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goto out_schedule;
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}
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static int
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rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
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{
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struct rpcrdma_xprt *xprt = id->context;
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struct rpcrdma_ia *ia = &xprt->rx_ia;
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struct rpcrdma_ep *ep = &xprt->rx_ep;
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr;
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#endif
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struct ib_qp_attr *attr = &ia->ri_qp_attr;
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struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr;
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int connstate = 0;
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switch (event->event) {
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case RDMA_CM_EVENT_ADDR_RESOLVED:
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case RDMA_CM_EVENT_ROUTE_RESOLVED:
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ia->ri_async_rc = 0;
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complete(&ia->ri_done);
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break;
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case RDMA_CM_EVENT_ADDR_ERROR:
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ia->ri_async_rc = -EHOSTUNREACH;
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dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
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__func__, ep);
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complete(&ia->ri_done);
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break;
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case RDMA_CM_EVENT_ROUTE_ERROR:
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ia->ri_async_rc = -ENETUNREACH;
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dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
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__func__, ep);
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complete(&ia->ri_done);
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break;
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case RDMA_CM_EVENT_ESTABLISHED:
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connstate = 1;
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ib_query_qp(ia->ri_id->qp, attr,
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IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC,
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iattr);
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dprintk("RPC: %s: %d responder resources"
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" (%d initiator)\n",
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__func__, attr->max_dest_rd_atomic,
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attr->max_rd_atomic);
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goto connected;
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case RDMA_CM_EVENT_CONNECT_ERROR:
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connstate = -ENOTCONN;
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goto connected;
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case RDMA_CM_EVENT_UNREACHABLE:
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connstate = -ENETDOWN;
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goto connected;
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case RDMA_CM_EVENT_REJECTED:
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connstate = -ECONNREFUSED;
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goto connected;
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case RDMA_CM_EVENT_DISCONNECTED:
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connstate = -ECONNABORTED;
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goto connected;
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case RDMA_CM_EVENT_DEVICE_REMOVAL:
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connstate = -ENODEV;
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connected:
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dprintk("RPC: %s: %sconnected\n",
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__func__, connstate > 0 ? "" : "dis");
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atomic_set(&xprt->rx_buf.rb_credits, 1);
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ep->rep_connected = connstate;
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rpcrdma_conn_func(ep);
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wake_up_all(&ep->rep_connect_wait);
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/*FALLTHROUGH*/
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default:
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dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n",
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__func__, sap, rpc_get_port(sap), ep,
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rdma_event_msg(event->event));
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break;
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}
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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if (connstate == 1) {
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int ird = attr->max_dest_rd_atomic;
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int tird = ep->rep_remote_cma.responder_resources;
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pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n",
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sap, rpc_get_port(sap),
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ia->ri_device->name,
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ia->ri_ops->ro_displayname,
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xprt->rx_buf.rb_max_requests,
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ird, ird < 4 && ird < tird / 2 ? " (low!)" : "");
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} else if (connstate < 0) {
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pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n",
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sap, rpc_get_port(sap), connstate);
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}
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#endif
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return 0;
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}
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static void rpcrdma_destroy_id(struct rdma_cm_id *id)
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{
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if (id) {
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module_put(id->device->owner);
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rdma_destroy_id(id);
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}
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}
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static struct rdma_cm_id *
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rpcrdma_create_id(struct rpcrdma_xprt *xprt,
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struct rpcrdma_ia *ia, struct sockaddr *addr)
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{
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struct rdma_cm_id *id;
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int rc;
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init_completion(&ia->ri_done);
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id = rdma_create_id(&init_net, rpcrdma_conn_upcall, xprt, RDMA_PS_TCP,
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IB_QPT_RC);
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if (IS_ERR(id)) {
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rc = PTR_ERR(id);
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dprintk("RPC: %s: rdma_create_id() failed %i\n",
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__func__, rc);
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return id;
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}
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ia->ri_async_rc = -ETIMEDOUT;
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rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT);
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if (rc) {
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dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
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__func__, rc);
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goto out;
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}
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wait_for_completion_interruptible_timeout(&ia->ri_done,
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msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
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|
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/* FIXME:
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* Until xprtrdma supports DEVICE_REMOVAL, the provider must
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* be pinned while there are active NFS/RDMA mounts to prevent
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* hangs and crashes at umount time.
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*/
|
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if (!ia->ri_async_rc && !try_module_get(id->device->owner)) {
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dprintk("RPC: %s: Failed to get device module\n",
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__func__);
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ia->ri_async_rc = -ENODEV;
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}
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rc = ia->ri_async_rc;
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if (rc)
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goto out;
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ia->ri_async_rc = -ETIMEDOUT;
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rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
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if (rc) {
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dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
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__func__, rc);
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goto put;
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}
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wait_for_completion_interruptible_timeout(&ia->ri_done,
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msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1);
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rc = ia->ri_async_rc;
|
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if (rc)
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goto put;
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|
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return id;
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put:
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module_put(id->device->owner);
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out:
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rdma_destroy_id(id);
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return ERR_PTR(rc);
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}
|
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|
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/*
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* Exported functions.
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*/
|
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|
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/*
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* Open and initialize an Interface Adapter.
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* o initializes fields of struct rpcrdma_ia, including
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* interface and provider attributes and protection zone.
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*/
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int
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rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
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{
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struct rpcrdma_ia *ia = &xprt->rx_ia;
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int rc;
|
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|
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ia->ri_dma_mr = NULL;
|
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|
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ia->ri_id = rpcrdma_create_id(xprt, ia, addr);
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if (IS_ERR(ia->ri_id)) {
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rc = PTR_ERR(ia->ri_id);
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goto out1;
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}
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ia->ri_device = ia->ri_id->device;
|
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|
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ia->ri_pd = ib_alloc_pd(ia->ri_device);
|
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if (IS_ERR(ia->ri_pd)) {
|
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rc = PTR_ERR(ia->ri_pd);
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dprintk("RPC: %s: ib_alloc_pd() failed %i\n",
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__func__, rc);
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goto out2;
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}
|
|
|
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if (memreg == RPCRDMA_FRMR) {
|
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if (!(ia->ri_device->attrs.device_cap_flags &
|
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IB_DEVICE_MEM_MGT_EXTENSIONS) ||
|
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(ia->ri_device->attrs.max_fast_reg_page_list_len == 0)) {
|
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dprintk("RPC: %s: FRMR registration "
|
|
"not supported by HCA\n", __func__);
|
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memreg = RPCRDMA_MTHCAFMR;
|
|
}
|
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}
|
|
if (memreg == RPCRDMA_MTHCAFMR) {
|
|
if (!ia->ri_device->alloc_fmr) {
|
|
dprintk("RPC: %s: MTHCAFMR registration "
|
|
"not supported by HCA\n", __func__);
|
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rc = -EINVAL;
|
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goto out3;
|
|
}
|
|
}
|
|
|
|
switch (memreg) {
|
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case RPCRDMA_FRMR:
|
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ia->ri_ops = &rpcrdma_frwr_memreg_ops;
|
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break;
|
|
case RPCRDMA_ALLPHYSICAL:
|
|
ia->ri_ops = &rpcrdma_physical_memreg_ops;
|
|
break;
|
|
case RPCRDMA_MTHCAFMR:
|
|
ia->ri_ops = &rpcrdma_fmr_memreg_ops;
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "RPC: Unsupported memory "
|
|
"registration mode: %d\n", memreg);
|
|
rc = -ENOMEM;
|
|
goto out3;
|
|
}
|
|
dprintk("RPC: %s: memory registration strategy is '%s'\n",
|
|
__func__, ia->ri_ops->ro_displayname);
|
|
|
|
return 0;
|
|
|
|
out3:
|
|
ib_dealloc_pd(ia->ri_pd);
|
|
ia->ri_pd = NULL;
|
|
out2:
|
|
rpcrdma_destroy_id(ia->ri_id);
|
|
ia->ri_id = NULL;
|
|
out1:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Clean up/close an IA.
|
|
* o if event handles and PD have been initialized, free them.
|
|
* o close the IA
|
|
*/
|
|
void
|
|
rpcrdma_ia_close(struct rpcrdma_ia *ia)
|
|
{
|
|
dprintk("RPC: %s: entering\n", __func__);
|
|
if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) {
|
|
if (ia->ri_id->qp)
|
|
rdma_destroy_qp(ia->ri_id);
|
|
rpcrdma_destroy_id(ia->ri_id);
|
|
ia->ri_id = NULL;
|
|
}
|
|
|
|
/* If the pd is still busy, xprtrdma missed freeing a resource */
|
|
if (ia->ri_pd && !IS_ERR(ia->ri_pd))
|
|
ib_dealloc_pd(ia->ri_pd);
|
|
}
|
|
|
|
/*
|
|
* Create unconnected endpoint.
|
|
*/
|
|
int
|
|
rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
|
|
struct rpcrdma_create_data_internal *cdata)
|
|
{
|
|
struct ib_cq *sendcq, *recvcq;
|
|
unsigned int max_qp_wr;
|
|
int rc;
|
|
|
|
if (ia->ri_device->attrs.max_sge < RPCRDMA_MAX_IOVS) {
|
|
dprintk("RPC: %s: insufficient sge's available\n",
|
|
__func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) {
|
|
dprintk("RPC: %s: insufficient wqe's available\n",
|
|
__func__);
|
|
return -ENOMEM;
|
|
}
|
|
max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1;
|
|
|
|
/* check provider's send/recv wr limits */
|
|
if (cdata->max_requests > max_qp_wr)
|
|
cdata->max_requests = max_qp_wr;
|
|
|
|
ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
|
|
ep->rep_attr.qp_context = ep;
|
|
ep->rep_attr.srq = NULL;
|
|
ep->rep_attr.cap.max_send_wr = cdata->max_requests;
|
|
ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
|
|
ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */
|
|
rc = ia->ri_ops->ro_open(ia, ep, cdata);
|
|
if (rc)
|
|
return rc;
|
|
ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
|
|
ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
|
|
ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */
|
|
ep->rep_attr.cap.max_send_sge = RPCRDMA_MAX_IOVS;
|
|
ep->rep_attr.cap.max_recv_sge = 1;
|
|
ep->rep_attr.cap.max_inline_data = 0;
|
|
ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
|
ep->rep_attr.qp_type = IB_QPT_RC;
|
|
ep->rep_attr.port_num = ~0;
|
|
|
|
dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
|
|
"iovs: send %d recv %d\n",
|
|
__func__,
|
|
ep->rep_attr.cap.max_send_wr,
|
|
ep->rep_attr.cap.max_recv_wr,
|
|
ep->rep_attr.cap.max_send_sge,
|
|
ep->rep_attr.cap.max_recv_sge);
|
|
|
|
/* set trigger for requesting send completion */
|
|
ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1;
|
|
if (ep->rep_cqinit <= 2)
|
|
ep->rep_cqinit = 0; /* always signal? */
|
|
INIT_CQCOUNT(ep);
|
|
init_waitqueue_head(&ep->rep_connect_wait);
|
|
INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);
|
|
|
|
sendcq = ib_alloc_cq(ia->ri_device, NULL,
|
|
ep->rep_attr.cap.max_send_wr + 1,
|
|
0, IB_POLL_SOFTIRQ);
|
|
if (IS_ERR(sendcq)) {
|
|
rc = PTR_ERR(sendcq);
|
|
dprintk("RPC: %s: failed to create send CQ: %i\n",
|
|
__func__, rc);
|
|
goto out1;
|
|
}
|
|
|
|
recvcq = ib_alloc_cq(ia->ri_device, NULL,
|
|
ep->rep_attr.cap.max_recv_wr + 1,
|
|
0, IB_POLL_SOFTIRQ);
|
|
if (IS_ERR(recvcq)) {
|
|
rc = PTR_ERR(recvcq);
|
|
dprintk("RPC: %s: failed to create recv CQ: %i\n",
|
|
__func__, rc);
|
|
goto out2;
|
|
}
|
|
|
|
ep->rep_attr.send_cq = sendcq;
|
|
ep->rep_attr.recv_cq = recvcq;
|
|
|
|
/* Initialize cma parameters */
|
|
memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma));
|
|
|
|
/* RPC/RDMA does not use private data */
|
|
ep->rep_remote_cma.private_data = NULL;
|
|
ep->rep_remote_cma.private_data_len = 0;
|
|
|
|
/* Client offers RDMA Read but does not initiate */
|
|
ep->rep_remote_cma.initiator_depth = 0;
|
|
if (ia->ri_device->attrs.max_qp_rd_atom > 32) /* arbitrary but <= 255 */
|
|
ep->rep_remote_cma.responder_resources = 32;
|
|
else
|
|
ep->rep_remote_cma.responder_resources =
|
|
ia->ri_device->attrs.max_qp_rd_atom;
|
|
|
|
/* Limit transport retries so client can detect server
|
|
* GID changes quickly. RPC layer handles re-establishing
|
|
* transport connection and retransmission.
|
|
*/
|
|
ep->rep_remote_cma.retry_count = 6;
|
|
|
|
/* RPC-over-RDMA handles its own flow control. In addition,
|
|
* make all RNR NAKs visible so we know that RPC-over-RDMA
|
|
* flow control is working correctly (no NAKs should be seen).
|
|
*/
|
|
ep->rep_remote_cma.flow_control = 0;
|
|
ep->rep_remote_cma.rnr_retry_count = 0;
|
|
|
|
return 0;
|
|
|
|
out2:
|
|
ib_free_cq(sendcq);
|
|
out1:
|
|
if (ia->ri_dma_mr)
|
|
ib_dereg_mr(ia->ri_dma_mr);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* rpcrdma_ep_destroy
|
|
*
|
|
* Disconnect and destroy endpoint. After this, the only
|
|
* valid operations on the ep are to free it (if dynamically
|
|
* allocated) or re-create it.
|
|
*/
|
|
void
|
|
rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
|
|
{
|
|
int rc;
|
|
|
|
dprintk("RPC: %s: entering, connected is %d\n",
|
|
__func__, ep->rep_connected);
|
|
|
|
cancel_delayed_work_sync(&ep->rep_connect_worker);
|
|
|
|
if (ia->ri_id->qp) {
|
|
rpcrdma_ep_disconnect(ep, ia);
|
|
rdma_destroy_qp(ia->ri_id);
|
|
ia->ri_id->qp = NULL;
|
|
}
|
|
|
|
ib_free_cq(ep->rep_attr.recv_cq);
|
|
ib_free_cq(ep->rep_attr.send_cq);
|
|
|
|
if (ia->ri_dma_mr) {
|
|
rc = ib_dereg_mr(ia->ri_dma_mr);
|
|
dprintk("RPC: %s: ib_dereg_mr returned %i\n",
|
|
__func__, rc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Connect unconnected endpoint.
|
|
*/
|
|
int
|
|
rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
|
|
{
|
|
struct rdma_cm_id *id, *old;
|
|
int rc = 0;
|
|
int retry_count = 0;
|
|
|
|
if (ep->rep_connected != 0) {
|
|
struct rpcrdma_xprt *xprt;
|
|
retry:
|
|
dprintk("RPC: %s: reconnecting...\n", __func__);
|
|
|
|
rpcrdma_ep_disconnect(ep, ia);
|
|
|
|
xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
|
|
id = rpcrdma_create_id(xprt, ia,
|
|
(struct sockaddr *)&xprt->rx_data.addr);
|
|
if (IS_ERR(id)) {
|
|
rc = -EHOSTUNREACH;
|
|
goto out;
|
|
}
|
|
/* TEMP TEMP TEMP - fail if new device:
|
|
* Deregister/remarshal *all* requests!
|
|
* Close and recreate adapter, pd, etc!
|
|
* Re-determine all attributes still sane!
|
|
* More stuff I haven't thought of!
|
|
* Rrrgh!
|
|
*/
|
|
if (ia->ri_device != id->device) {
|
|
printk("RPC: %s: can't reconnect on "
|
|
"different device!\n", __func__);
|
|
rpcrdma_destroy_id(id);
|
|
rc = -ENETUNREACH;
|
|
goto out;
|
|
}
|
|
/* END TEMP */
|
|
rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
|
|
if (rc) {
|
|
dprintk("RPC: %s: rdma_create_qp failed %i\n",
|
|
__func__, rc);
|
|
rpcrdma_destroy_id(id);
|
|
rc = -ENETUNREACH;
|
|
goto out;
|
|
}
|
|
|
|
old = ia->ri_id;
|
|
ia->ri_id = id;
|
|
|
|
rdma_destroy_qp(old);
|
|
rpcrdma_destroy_id(old);
|
|
} else {
|
|
dprintk("RPC: %s: connecting...\n", __func__);
|
|
rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
|
|
if (rc) {
|
|
dprintk("RPC: %s: rdma_create_qp failed %i\n",
|
|
__func__, rc);
|
|
/* do not update ep->rep_connected */
|
|
return -ENETUNREACH;
|
|
}
|
|
}
|
|
|
|
ep->rep_connected = 0;
|
|
|
|
rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
|
|
if (rc) {
|
|
dprintk("RPC: %s: rdma_connect() failed with %i\n",
|
|
__func__, rc);
|
|
goto out;
|
|
}
|
|
|
|
wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
|
|
|
|
/*
|
|
* Check state. A non-peer reject indicates no listener
|
|
* (ECONNREFUSED), which may be a transient state. All
|
|
* others indicate a transport condition which has already
|
|
* undergone a best-effort.
|
|
*/
|
|
if (ep->rep_connected == -ECONNREFUSED &&
|
|
++retry_count <= RDMA_CONNECT_RETRY_MAX) {
|
|
dprintk("RPC: %s: non-peer_reject, retry\n", __func__);
|
|
goto retry;
|
|
}
|
|
if (ep->rep_connected <= 0) {
|
|
/* Sometimes, the only way to reliably connect to remote
|
|
* CMs is to use same nonzero values for ORD and IRD. */
|
|
if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 &&
|
|
(ep->rep_remote_cma.responder_resources == 0 ||
|
|
ep->rep_remote_cma.initiator_depth !=
|
|
ep->rep_remote_cma.responder_resources)) {
|
|
if (ep->rep_remote_cma.responder_resources == 0)
|
|
ep->rep_remote_cma.responder_resources = 1;
|
|
ep->rep_remote_cma.initiator_depth =
|
|
ep->rep_remote_cma.responder_resources;
|
|
goto retry;
|
|
}
|
|
rc = ep->rep_connected;
|
|
} else {
|
|
struct rpcrdma_xprt *r_xprt;
|
|
unsigned int extras;
|
|
|
|
dprintk("RPC: %s: connected\n", __func__);
|
|
|
|
r_xprt = container_of(ia, struct rpcrdma_xprt, rx_ia);
|
|
extras = r_xprt->rx_buf.rb_bc_srv_max_requests;
|
|
|
|
if (extras) {
|
|
rc = rpcrdma_ep_post_extra_recv(r_xprt, extras);
|
|
if (rc) {
|
|
pr_warn("%s: rpcrdma_ep_post_extra_recv: %i\n",
|
|
__func__, rc);
|
|
rc = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (rc)
|
|
ep->rep_connected = rc;
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* rpcrdma_ep_disconnect
|
|
*
|
|
* This is separate from destroy to facilitate the ability
|
|
* to reconnect without recreating the endpoint.
|
|
*
|
|
* This call is not reentrant, and must not be made in parallel
|
|
* on the same endpoint.
|
|
*/
|
|
void
|
|
rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
|
|
{
|
|
int rc;
|
|
|
|
rc = rdma_disconnect(ia->ri_id);
|
|
if (!rc) {
|
|
/* returns without wait if not connected */
|
|
wait_event_interruptible(ep->rep_connect_wait,
|
|
ep->rep_connected != 1);
|
|
dprintk("RPC: %s: after wait, %sconnected\n", __func__,
|
|
(ep->rep_connected == 1) ? "still " : "dis");
|
|
} else {
|
|
dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc);
|
|
ep->rep_connected = rc;
|
|
}
|
|
|
|
ib_drain_qp(ia->ri_id->qp);
|
|
}
|
|
|
|
struct rpcrdma_req *
|
|
rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
|
|
struct rpcrdma_req *req;
|
|
|
|
req = kzalloc(sizeof(*req), GFP_KERNEL);
|
|
if (req == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
INIT_LIST_HEAD(&req->rl_free);
|
|
spin_lock(&buffer->rb_reqslock);
|
|
list_add(&req->rl_all, &buffer->rb_allreqs);
|
|
spin_unlock(&buffer->rb_reqslock);
|
|
req->rl_cqe.done = rpcrdma_wc_send;
|
|
req->rl_buffer = &r_xprt->rx_buf;
|
|
return req;
|
|
}
|
|
|
|
struct rpcrdma_rep *
|
|
rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
struct rpcrdma_rep *rep;
|
|
int rc;
|
|
|
|
rc = -ENOMEM;
|
|
rep = kzalloc(sizeof(*rep), GFP_KERNEL);
|
|
if (rep == NULL)
|
|
goto out;
|
|
|
|
rep->rr_rdmabuf = rpcrdma_alloc_regbuf(ia, cdata->inline_rsize,
|
|
GFP_KERNEL);
|
|
if (IS_ERR(rep->rr_rdmabuf)) {
|
|
rc = PTR_ERR(rep->rr_rdmabuf);
|
|
goto out_free;
|
|
}
|
|
|
|
rep->rr_device = ia->ri_device;
|
|
rep->rr_cqe.done = rpcrdma_receive_wc;
|
|
rep->rr_rxprt = r_xprt;
|
|
INIT_WORK(&rep->rr_work, rpcrdma_receive_worker);
|
|
return rep;
|
|
|
|
out_free:
|
|
kfree(rep);
|
|
out:
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
int
|
|
rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
int i, rc;
|
|
|
|
buf->rb_max_requests = r_xprt->rx_data.max_requests;
|
|
buf->rb_bc_srv_max_requests = 0;
|
|
spin_lock_init(&buf->rb_lock);
|
|
atomic_set(&buf->rb_credits, 1);
|
|
|
|
rc = ia->ri_ops->ro_init(r_xprt);
|
|
if (rc)
|
|
goto out;
|
|
|
|
INIT_LIST_HEAD(&buf->rb_send_bufs);
|
|
INIT_LIST_HEAD(&buf->rb_allreqs);
|
|
spin_lock_init(&buf->rb_reqslock);
|
|
for (i = 0; i < buf->rb_max_requests; i++) {
|
|
struct rpcrdma_req *req;
|
|
|
|
req = rpcrdma_create_req(r_xprt);
|
|
if (IS_ERR(req)) {
|
|
dprintk("RPC: %s: request buffer %d alloc"
|
|
" failed\n", __func__, i);
|
|
rc = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
req->rl_backchannel = false;
|
|
list_add(&req->rl_free, &buf->rb_send_bufs);
|
|
}
|
|
|
|
INIT_LIST_HEAD(&buf->rb_recv_bufs);
|
|
for (i = 0; i < buf->rb_max_requests + 2; i++) {
|
|
struct rpcrdma_rep *rep;
|
|
|
|
rep = rpcrdma_create_rep(r_xprt);
|
|
if (IS_ERR(rep)) {
|
|
dprintk("RPC: %s: reply buffer %d alloc failed\n",
|
|
__func__, i);
|
|
rc = PTR_ERR(rep);
|
|
goto out;
|
|
}
|
|
list_add(&rep->rr_list, &buf->rb_recv_bufs);
|
|
}
|
|
|
|
return 0;
|
|
out:
|
|
rpcrdma_buffer_destroy(buf);
|
|
return rc;
|
|
}
|
|
|
|
static struct rpcrdma_req *
|
|
rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf)
|
|
{
|
|
struct rpcrdma_req *req;
|
|
|
|
req = list_first_entry(&buf->rb_send_bufs,
|
|
struct rpcrdma_req, rl_free);
|
|
list_del(&req->rl_free);
|
|
return req;
|
|
}
|
|
|
|
static struct rpcrdma_rep *
|
|
rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer *buf)
|
|
{
|
|
struct rpcrdma_rep *rep;
|
|
|
|
rep = list_first_entry(&buf->rb_recv_bufs,
|
|
struct rpcrdma_rep, rr_list);
|
|
list_del(&rep->rr_list);
|
|
return rep;
|
|
}
|
|
|
|
static void
|
|
rpcrdma_destroy_rep(struct rpcrdma_ia *ia, struct rpcrdma_rep *rep)
|
|
{
|
|
rpcrdma_free_regbuf(ia, rep->rr_rdmabuf);
|
|
kfree(rep);
|
|
}
|
|
|
|
void
|
|
rpcrdma_destroy_req(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
|
|
{
|
|
rpcrdma_free_regbuf(ia, req->rl_sendbuf);
|
|
rpcrdma_free_regbuf(ia, req->rl_rdmabuf);
|
|
kfree(req);
|
|
}
|
|
|
|
void
|
|
rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
|
|
{
|
|
struct rpcrdma_ia *ia = rdmab_to_ia(buf);
|
|
|
|
while (!list_empty(&buf->rb_recv_bufs)) {
|
|
struct rpcrdma_rep *rep;
|
|
|
|
rep = rpcrdma_buffer_get_rep_locked(buf);
|
|
rpcrdma_destroy_rep(ia, rep);
|
|
}
|
|
|
|
spin_lock(&buf->rb_reqslock);
|
|
while (!list_empty(&buf->rb_allreqs)) {
|
|
struct rpcrdma_req *req;
|
|
|
|
req = list_first_entry(&buf->rb_allreqs,
|
|
struct rpcrdma_req, rl_all);
|
|
list_del(&req->rl_all);
|
|
|
|
spin_unlock(&buf->rb_reqslock);
|
|
rpcrdma_destroy_req(ia, req);
|
|
spin_lock(&buf->rb_reqslock);
|
|
}
|
|
spin_unlock(&buf->rb_reqslock);
|
|
|
|
ia->ri_ops->ro_destroy(buf);
|
|
}
|
|
|
|
struct rpcrdma_mw *
|
|
rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
struct rpcrdma_mw *mw = NULL;
|
|
|
|
spin_lock(&buf->rb_mwlock);
|
|
if (!list_empty(&buf->rb_mws)) {
|
|
mw = list_first_entry(&buf->rb_mws,
|
|
struct rpcrdma_mw, mw_list);
|
|
list_del_init(&mw->mw_list);
|
|
}
|
|
spin_unlock(&buf->rb_mwlock);
|
|
|
|
if (!mw)
|
|
pr_err("RPC: %s: no MWs available\n", __func__);
|
|
return mw;
|
|
}
|
|
|
|
void
|
|
rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)
|
|
{
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
|
|
spin_lock(&buf->rb_mwlock);
|
|
list_add_tail(&mw->mw_list, &buf->rb_mws);
|
|
spin_unlock(&buf->rb_mwlock);
|
|
}
|
|
|
|
/*
|
|
* Get a set of request/reply buffers.
|
|
*
|
|
* Reply buffer (if available) is attached to send buffer upon return.
|
|
*/
|
|
struct rpcrdma_req *
|
|
rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
|
|
{
|
|
struct rpcrdma_req *req;
|
|
|
|
spin_lock(&buffers->rb_lock);
|
|
if (list_empty(&buffers->rb_send_bufs))
|
|
goto out_reqbuf;
|
|
req = rpcrdma_buffer_get_req_locked(buffers);
|
|
if (list_empty(&buffers->rb_recv_bufs))
|
|
goto out_repbuf;
|
|
req->rl_reply = rpcrdma_buffer_get_rep_locked(buffers);
|
|
spin_unlock(&buffers->rb_lock);
|
|
return req;
|
|
|
|
out_reqbuf:
|
|
spin_unlock(&buffers->rb_lock);
|
|
pr_warn("RPC: %s: out of request buffers\n", __func__);
|
|
return NULL;
|
|
out_repbuf:
|
|
spin_unlock(&buffers->rb_lock);
|
|
pr_warn("RPC: %s: out of reply buffers\n", __func__);
|
|
req->rl_reply = NULL;
|
|
return req;
|
|
}
|
|
|
|
/*
|
|
* Put request/reply buffers back into pool.
|
|
* Pre-decrement counter/array index.
|
|
*/
|
|
void
|
|
rpcrdma_buffer_put(struct rpcrdma_req *req)
|
|
{
|
|
struct rpcrdma_buffer *buffers = req->rl_buffer;
|
|
struct rpcrdma_rep *rep = req->rl_reply;
|
|
|
|
req->rl_niovs = 0;
|
|
req->rl_reply = NULL;
|
|
|
|
spin_lock(&buffers->rb_lock);
|
|
list_add_tail(&req->rl_free, &buffers->rb_send_bufs);
|
|
if (rep)
|
|
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
|
|
spin_unlock(&buffers->rb_lock);
|
|
}
|
|
|
|
/*
|
|
* Recover reply buffers from pool.
|
|
* This happens when recovering from disconnect.
|
|
*/
|
|
void
|
|
rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
|
|
{
|
|
struct rpcrdma_buffer *buffers = req->rl_buffer;
|
|
|
|
spin_lock(&buffers->rb_lock);
|
|
if (!list_empty(&buffers->rb_recv_bufs))
|
|
req->rl_reply = rpcrdma_buffer_get_rep_locked(buffers);
|
|
spin_unlock(&buffers->rb_lock);
|
|
}
|
|
|
|
/*
|
|
* Put reply buffers back into pool when not attached to
|
|
* request. This happens in error conditions.
|
|
*/
|
|
void
|
|
rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
|
|
{
|
|
struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
|
|
|
|
spin_lock(&buffers->rb_lock);
|
|
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
|
|
spin_unlock(&buffers->rb_lock);
|
|
}
|
|
|
|
/*
|
|
* Wrappers for internal-use kmalloc memory registration, used by buffer code.
|
|
*/
|
|
|
|
void
|
|
rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg)
|
|
{
|
|
dprintk("RPC: map_one: offset %p iova %llx len %zu\n",
|
|
seg->mr_offset,
|
|
(unsigned long long)seg->mr_dma, seg->mr_dmalen);
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers
|
|
* @ia: controlling rpcrdma_ia
|
|
* @size: size of buffer to be allocated, in bytes
|
|
* @flags: GFP flags
|
|
*
|
|
* Returns pointer to private header of an area of internally
|
|
* registered memory, or an ERR_PTR. The registered buffer follows
|
|
* the end of the private header.
|
|
*
|
|
* xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
|
|
* receiving the payload of RDMA RECV operations. regbufs are not
|
|
* used for RDMA READ/WRITE operations, thus are registered only for
|
|
* LOCAL access.
|
|
*/
|
|
struct rpcrdma_regbuf *
|
|
rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags)
|
|
{
|
|
struct rpcrdma_regbuf *rb;
|
|
struct ib_sge *iov;
|
|
|
|
rb = kmalloc(sizeof(*rb) + size, flags);
|
|
if (rb == NULL)
|
|
goto out;
|
|
|
|
iov = &rb->rg_iov;
|
|
iov->addr = ib_dma_map_single(ia->ri_device,
|
|
(void *)rb->rg_base, size,
|
|
DMA_BIDIRECTIONAL);
|
|
if (ib_dma_mapping_error(ia->ri_device, iov->addr))
|
|
goto out_free;
|
|
|
|
iov->length = size;
|
|
iov->lkey = ia->ri_pd->local_dma_lkey;
|
|
rb->rg_size = size;
|
|
rb->rg_owner = NULL;
|
|
return rb;
|
|
|
|
out_free:
|
|
kfree(rb);
|
|
out:
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_free_regbuf - deregister and free registered buffer
|
|
* @ia: controlling rpcrdma_ia
|
|
* @rb: regbuf to be deregistered and freed
|
|
*/
|
|
void
|
|
rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
|
|
{
|
|
struct ib_sge *iov;
|
|
|
|
if (!rb)
|
|
return;
|
|
|
|
iov = &rb->rg_iov;
|
|
ib_dma_unmap_single(ia->ri_device,
|
|
iov->addr, iov->length, DMA_BIDIRECTIONAL);
|
|
kfree(rb);
|
|
}
|
|
|
|
/*
|
|
* Prepost any receive buffer, then post send.
|
|
*
|
|
* Receive buffer is donated to hardware, reclaimed upon recv completion.
|
|
*/
|
|
int
|
|
rpcrdma_ep_post(struct rpcrdma_ia *ia,
|
|
struct rpcrdma_ep *ep,
|
|
struct rpcrdma_req *req)
|
|
{
|
|
struct ib_device *device = ia->ri_device;
|
|
struct ib_send_wr send_wr, *send_wr_fail;
|
|
struct rpcrdma_rep *rep = req->rl_reply;
|
|
struct ib_sge *iov = req->rl_send_iov;
|
|
int i, rc;
|
|
|
|
if (rep) {
|
|
rc = rpcrdma_ep_post_recv(ia, ep, rep);
|
|
if (rc)
|
|
goto out;
|
|
req->rl_reply = NULL;
|
|
}
|
|
|
|
send_wr.next = NULL;
|
|
send_wr.wr_cqe = &req->rl_cqe;
|
|
send_wr.sg_list = iov;
|
|
send_wr.num_sge = req->rl_niovs;
|
|
send_wr.opcode = IB_WR_SEND;
|
|
|
|
for (i = 0; i < send_wr.num_sge; i++)
|
|
ib_dma_sync_single_for_device(device, iov[i].addr,
|
|
iov[i].length, DMA_TO_DEVICE);
|
|
dprintk("RPC: %s: posting %d s/g entries\n",
|
|
__func__, send_wr.num_sge);
|
|
|
|
if (DECR_CQCOUNT(ep) > 0)
|
|
send_wr.send_flags = 0;
|
|
else { /* Provider must take a send completion every now and then */
|
|
INIT_CQCOUNT(ep);
|
|
send_wr.send_flags = IB_SEND_SIGNALED;
|
|
}
|
|
|
|
rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail);
|
|
if (rc)
|
|
dprintk("RPC: %s: ib_post_send returned %i\n", __func__,
|
|
rc);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* (Re)post a receive buffer.
|
|
*/
|
|
int
|
|
rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
|
|
struct rpcrdma_ep *ep,
|
|
struct rpcrdma_rep *rep)
|
|
{
|
|
struct ib_recv_wr recv_wr, *recv_wr_fail;
|
|
int rc;
|
|
|
|
recv_wr.next = NULL;
|
|
recv_wr.wr_cqe = &rep->rr_cqe;
|
|
recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
|
|
recv_wr.num_sge = 1;
|
|
|
|
ib_dma_sync_single_for_cpu(ia->ri_device,
|
|
rdmab_addr(rep->rr_rdmabuf),
|
|
rdmab_length(rep->rr_rdmabuf),
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail);
|
|
|
|
if (rc)
|
|
dprintk("RPC: %s: ib_post_recv returned %i\n", __func__,
|
|
rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests
|
|
* @r_xprt: transport associated with these backchannel resources
|
|
* @min_reqs: minimum number of incoming requests expected
|
|
*
|
|
* Returns zero if all requested buffers were posted, or a negative errno.
|
|
*/
|
|
int
|
|
rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *r_xprt, unsigned int count)
|
|
{
|
|
struct rpcrdma_buffer *buffers = &r_xprt->rx_buf;
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
struct rpcrdma_ep *ep = &r_xprt->rx_ep;
|
|
struct rpcrdma_rep *rep;
|
|
int rc;
|
|
|
|
while (count--) {
|
|
spin_lock(&buffers->rb_lock);
|
|
if (list_empty(&buffers->rb_recv_bufs))
|
|
goto out_reqbuf;
|
|
rep = rpcrdma_buffer_get_rep_locked(buffers);
|
|
spin_unlock(&buffers->rb_lock);
|
|
|
|
rc = rpcrdma_ep_post_recv(ia, ep, rep);
|
|
if (rc)
|
|
goto out_rc;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_reqbuf:
|
|
spin_unlock(&buffers->rb_lock);
|
|
pr_warn("%s: no extra receive buffers\n", __func__);
|
|
return -ENOMEM;
|
|
|
|
out_rc:
|
|
rpcrdma_recv_buffer_put(rep);
|
|
return rc;
|
|
}
|