// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* Copyright (c) 2014-2017 Oracle. All rights reserved.
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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/sunrpc/addr.h>
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#include <linux/sunrpc/svc_rdma.h>
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#include <linux/log2.h>
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#include <asm-generic/barrier.h>
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#include <asm/bitops.h>
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#include <rdma/ib_cm.h>
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#include "xprt_rdma.h"
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#include <trace/events/rpcrdma.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 int rpcrdma_sendctxs_create(struct rpcrdma_xprt *r_xprt);
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static void rpcrdma_sendctxs_destroy(struct rpcrdma_xprt *r_xprt);
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static void rpcrdma_sendctx_put_locked(struct rpcrdma_xprt *r_xprt,
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struct rpcrdma_sendctx *sc);
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static int rpcrdma_reqs_setup(struct rpcrdma_xprt *r_xprt);
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static void rpcrdma_reqs_reset(struct rpcrdma_xprt *r_xprt);
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static void rpcrdma_rep_destroy(struct rpcrdma_rep *rep);
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static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt);
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static void rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt);
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static void rpcrdma_mrs_destroy(struct rpcrdma_xprt *r_xprt);
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static void rpcrdma_ep_get(struct rpcrdma_ep *ep);
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static int rpcrdma_ep_put(struct rpcrdma_ep *ep);
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static struct rpcrdma_regbuf *
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rpcrdma_regbuf_alloc(size_t size, enum dma_data_direction direction,
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gfp_t flags);
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static void rpcrdma_regbuf_dma_unmap(struct rpcrdma_regbuf *rb);
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static void rpcrdma_regbuf_free(struct rpcrdma_regbuf *rb);
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/* Wait for outstanding transport work to finish. ib_drain_qp
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* handles the drains in the wrong order for us, so open code
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* them here.
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*/
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static void rpcrdma_xprt_drain(struct rpcrdma_xprt *r_xprt)
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{
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struct rpcrdma_ep *ep = r_xprt->rx_ep;
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struct rdma_cm_id *id = ep->re_id;
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/* Flush Receives, then wait for deferred Reply work
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* to complete.
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*/
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ib_drain_rq(id->qp);
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/* Deferred Reply processing might have scheduled
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* local invalidations.
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*/
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ib_drain_sq(id->qp);
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rpcrdma_ep_put(ep);
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}
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/**
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* rpcrdma_qp_event_handler - Handle one QP event (error notification)
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* @event: details of the event
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* @context: ep that owns QP where event occurred
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*
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* Called from the RDMA provider (device driver) possibly in an interrupt
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* context. The QP is always destroyed before the ID, so the ID will be
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* reliably available when this handler is invoked.
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*/
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static void rpcrdma_qp_event_handler(struct ib_event *event, void *context)
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{
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struct rpcrdma_ep *ep = context;
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trace_xprtrdma_qp_event(ep, event);
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}
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/* Ensure xprt_force_disconnect() is invoked exactly once when a
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* connection is closed or lost. (The important thing is it needs
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* to be invoked "at least" once).
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*/
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static void rpcrdma_force_disconnect(struct rpcrdma_ep *ep)
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{
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if (atomic_add_unless(&ep->re_force_disconnect, 1, 1))
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xprt_force_disconnect(ep->re_xprt);
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}
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/**
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* rpcrdma_flush_disconnect - Disconnect on flushed completion
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* @r_xprt: transport to disconnect
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* @wc: work completion entry
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*
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* Must be called in process context.
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*/
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void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc)
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{
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if (wc->status != IB_WC_SUCCESS)
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rpcrdma_force_disconnect(r_xprt->rx_ep);
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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
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* @wc: WCE for a completed Send WR
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*
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*/
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static void rpcrdma_wc_send(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_sendctx *sc =
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container_of(cqe, struct rpcrdma_sendctx, sc_cqe);
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struct rpcrdma_xprt *r_xprt = cq->cq_context;
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/* WARNING: Only wr_cqe and status are reliable at this point */
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trace_xprtrdma_wc_send(sc, wc);
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rpcrdma_sendctx_put_locked(r_xprt, sc);
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rpcrdma_flush_disconnect(r_xprt, wc);
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}
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/**
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* rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
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* @cq: completion queue
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* @wc: WCE for a completed Receive WR
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*
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*/
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static void rpcrdma_wc_receive(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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struct rpcrdma_xprt *r_xprt = cq->cq_context;
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/* WARNING: Only wr_cqe and status are reliable at this point */
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trace_xprtrdma_wc_receive(wc);
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--r_xprt->rx_ep->re_receive_count;
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if (wc->status != IB_WC_SUCCESS)
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goto out_flushed;
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/* status == SUCCESS means all fields in wc are trustworthy */
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rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len);
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rep->rr_wc_flags = wc->wc_flags;
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rep->rr_inv_rkey = wc->ex.invalidate_rkey;
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ib_dma_sync_single_for_cpu(rdmab_device(rep->rr_rdmabuf),
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rdmab_addr(rep->rr_rdmabuf),
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wc->byte_len, DMA_FROM_DEVICE);
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rpcrdma_reply_handler(rep);
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return;
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out_flushed:
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rpcrdma_flush_disconnect(r_xprt, wc);
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rpcrdma_rep_destroy(rep);
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}
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static void rpcrdma_update_cm_private(struct rpcrdma_ep *ep,
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struct rdma_conn_param *param)
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{
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const struct rpcrdma_connect_private *pmsg = param->private_data;
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unsigned int rsize, wsize;
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/* Default settings for RPC-over-RDMA Version One */
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ep->re_implicit_roundup = xprt_rdma_pad_optimize;
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rsize = RPCRDMA_V1_DEF_INLINE_SIZE;
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wsize = RPCRDMA_V1_DEF_INLINE_SIZE;
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if (pmsg &&
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pmsg->cp_magic == rpcrdma_cmp_magic &&
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pmsg->cp_version == RPCRDMA_CMP_VERSION) {
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ep->re_implicit_roundup = true;
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rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size);
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wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size);
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}
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if (rsize < ep->re_inline_recv)
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ep->re_inline_recv = rsize;
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if (wsize < ep->re_inline_send)
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ep->re_inline_send = wsize;
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rpcrdma_set_max_header_sizes(ep);
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}
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/**
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* rpcrdma_cm_event_handler - Handle RDMA CM events
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* @id: rdma_cm_id on which an event has occurred
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* @event: details of the event
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*
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* Called with @id's mutex held. Returns 1 if caller should
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* destroy @id, otherwise 0.
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*/
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static int
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rpcrdma_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
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{
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struct sockaddr *sap = (struct sockaddr *)&id->route.addr.dst_addr;
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struct rpcrdma_ep *ep = id->context;
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might_sleep();
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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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ep->re_async_rc = 0;
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complete(&ep->re_done);
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return 0;
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case RDMA_CM_EVENT_ADDR_ERROR:
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ep->re_async_rc = -EPROTO;
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complete(&ep->re_done);
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return 0;
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case RDMA_CM_EVENT_ROUTE_ERROR:
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ep->re_async_rc = -ENETUNREACH;
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complete(&ep->re_done);
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return 0;
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case RDMA_CM_EVENT_DEVICE_REMOVAL:
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pr_info("rpcrdma: removing device %s for %pISpc\n",
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ep->re_id->device->name, sap);
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fallthrough;
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case RDMA_CM_EVENT_ADDR_CHANGE:
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ep->re_connect_status = -ENODEV;
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goto disconnected;
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case RDMA_CM_EVENT_ESTABLISHED:
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rpcrdma_ep_get(ep);
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ep->re_connect_status = 1;
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rpcrdma_update_cm_private(ep, &event->param.conn);
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trace_xprtrdma_inline_thresh(ep);
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wake_up_all(&ep->re_connect_wait);
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break;
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case RDMA_CM_EVENT_CONNECT_ERROR:
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ep->re_connect_status = -ENOTCONN;
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goto wake_connect_worker;
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case RDMA_CM_EVENT_UNREACHABLE:
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ep->re_connect_status = -ENETUNREACH;
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goto wake_connect_worker;
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case RDMA_CM_EVENT_REJECTED:
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dprintk("rpcrdma: connection to %pISpc rejected: %s\n",
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sap, rdma_reject_msg(id, event->status));
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ep->re_connect_status = -ECONNREFUSED;
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if (event->status == IB_CM_REJ_STALE_CONN)
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ep->re_connect_status = -ENOTCONN;
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wake_connect_worker:
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wake_up_all(&ep->re_connect_wait);
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return 0;
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case RDMA_CM_EVENT_DISCONNECTED:
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ep->re_connect_status = -ECONNABORTED;
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disconnected:
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rpcrdma_force_disconnect(ep);
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return rpcrdma_ep_put(ep);
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default:
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break;
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}
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dprintk("RPC: %s: %pISpc on %s/frwr: %s\n", __func__, sap,
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ep->re_id->device->name, rdma_event_msg(event->event));
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return 0;
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}
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static struct rdma_cm_id *rpcrdma_create_id(struct rpcrdma_xprt *r_xprt,
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struct rpcrdma_ep *ep)
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{
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unsigned long wtimeout = msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1;
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struct rpc_xprt *xprt = &r_xprt->rx_xprt;
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struct rdma_cm_id *id;
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int rc;
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init_completion(&ep->re_done);
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id = rdma_create_id(xprt->xprt_net, rpcrdma_cm_event_handler, ep,
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RDMA_PS_TCP, IB_QPT_RC);
|
if (IS_ERR(id))
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return id;
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ep->re_async_rc = -ETIMEDOUT;
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rc = rdma_resolve_addr(id, NULL, (struct sockaddr *)&xprt->addr,
|
RDMA_RESOLVE_TIMEOUT);
|
if (rc)
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goto out;
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rc = wait_for_completion_interruptible_timeout(&ep->re_done, wtimeout);
|
if (rc < 0)
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goto out;
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rc = ep->re_async_rc;
|
if (rc)
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goto out;
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ep->re_async_rc = -ETIMEDOUT;
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rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
|
if (rc)
|
goto out;
|
rc = wait_for_completion_interruptible_timeout(&ep->re_done, wtimeout);
|
if (rc < 0)
|
goto out;
|
rc = ep->re_async_rc;
|
if (rc)
|
goto out;
|
|
return id;
|
|
out:
|
rdma_destroy_id(id);
|
return ERR_PTR(rc);
|
}
|
|
static void rpcrdma_ep_destroy(struct kref *kref)
|
{
|
struct rpcrdma_ep *ep = container_of(kref, struct rpcrdma_ep, re_kref);
|
|
if (ep->re_id->qp) {
|
rdma_destroy_qp(ep->re_id);
|
ep->re_id->qp = NULL;
|
}
|
|
if (ep->re_attr.recv_cq)
|
ib_free_cq(ep->re_attr.recv_cq);
|
ep->re_attr.recv_cq = NULL;
|
if (ep->re_attr.send_cq)
|
ib_free_cq(ep->re_attr.send_cq);
|
ep->re_attr.send_cq = NULL;
|
|
if (ep->re_pd)
|
ib_dealloc_pd(ep->re_pd);
|
ep->re_pd = NULL;
|
|
kfree(ep);
|
module_put(THIS_MODULE);
|
}
|
|
static noinline void rpcrdma_ep_get(struct rpcrdma_ep *ep)
|
{
|
kref_get(&ep->re_kref);
|
}
|
|
/* Returns:
|
* %0 if @ep still has a positive kref count, or
|
* %1 if @ep was destroyed successfully.
|
*/
|
static noinline int rpcrdma_ep_put(struct rpcrdma_ep *ep)
|
{
|
return kref_put(&ep->re_kref, rpcrdma_ep_destroy);
|
}
|
|
static int rpcrdma_ep_create(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_connect_private *pmsg;
|
struct ib_device *device;
|
struct rdma_cm_id *id;
|
struct rpcrdma_ep *ep;
|
int rc;
|
|
ep = kzalloc(sizeof(*ep), GFP_NOFS);
|
if (!ep)
|
return -ENOTCONN;
|
ep->re_xprt = &r_xprt->rx_xprt;
|
kref_init(&ep->re_kref);
|
|
id = rpcrdma_create_id(r_xprt, ep);
|
if (IS_ERR(id)) {
|
kfree(ep);
|
return PTR_ERR(id);
|
}
|
__module_get(THIS_MODULE);
|
device = id->device;
|
ep->re_id = id;
|
|
ep->re_max_requests = r_xprt->rx_xprt.max_reqs;
|
ep->re_inline_send = xprt_rdma_max_inline_write;
|
ep->re_inline_recv = xprt_rdma_max_inline_read;
|
rc = frwr_query_device(ep, device);
|
if (rc)
|
goto out_destroy;
|
|
r_xprt->rx_buf.rb_max_requests = cpu_to_be32(ep->re_max_requests);
|
|
ep->re_attr.event_handler = rpcrdma_qp_event_handler;
|
ep->re_attr.qp_context = ep;
|
ep->re_attr.srq = NULL;
|
ep->re_attr.cap.max_inline_data = 0;
|
ep->re_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
ep->re_attr.qp_type = IB_QPT_RC;
|
ep->re_attr.port_num = ~0;
|
|
dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
|
"iovs: send %d recv %d\n",
|
__func__,
|
ep->re_attr.cap.max_send_wr,
|
ep->re_attr.cap.max_recv_wr,
|
ep->re_attr.cap.max_send_sge,
|
ep->re_attr.cap.max_recv_sge);
|
|
ep->re_send_batch = ep->re_max_requests >> 3;
|
ep->re_send_count = ep->re_send_batch;
|
init_waitqueue_head(&ep->re_connect_wait);
|
|
ep->re_attr.send_cq = ib_alloc_cq_any(device, r_xprt,
|
ep->re_attr.cap.max_send_wr,
|
IB_POLL_WORKQUEUE);
|
if (IS_ERR(ep->re_attr.send_cq)) {
|
rc = PTR_ERR(ep->re_attr.send_cq);
|
ep->re_attr.send_cq = NULL;
|
goto out_destroy;
|
}
|
|
ep->re_attr.recv_cq = ib_alloc_cq_any(device, r_xprt,
|
ep->re_attr.cap.max_recv_wr,
|
IB_POLL_WORKQUEUE);
|
if (IS_ERR(ep->re_attr.recv_cq)) {
|
rc = PTR_ERR(ep->re_attr.recv_cq);
|
ep->re_attr.recv_cq = NULL;
|
goto out_destroy;
|
}
|
ep->re_receive_count = 0;
|
|
/* Initialize cma parameters */
|
memset(&ep->re_remote_cma, 0, sizeof(ep->re_remote_cma));
|
|
/* Prepare RDMA-CM private message */
|
pmsg = &ep->re_cm_private;
|
pmsg->cp_magic = rpcrdma_cmp_magic;
|
pmsg->cp_version = RPCRDMA_CMP_VERSION;
|
pmsg->cp_flags |= RPCRDMA_CMP_F_SND_W_INV_OK;
|
pmsg->cp_send_size = rpcrdma_encode_buffer_size(ep->re_inline_send);
|
pmsg->cp_recv_size = rpcrdma_encode_buffer_size(ep->re_inline_recv);
|
ep->re_remote_cma.private_data = pmsg;
|
ep->re_remote_cma.private_data_len = sizeof(*pmsg);
|
|
/* Client offers RDMA Read but does not initiate */
|
ep->re_remote_cma.initiator_depth = 0;
|
ep->re_remote_cma.responder_resources =
|
min_t(int, U8_MAX, 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->re_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->re_remote_cma.flow_control = 0;
|
ep->re_remote_cma.rnr_retry_count = 0;
|
|
ep->re_pd = ib_alloc_pd(device, 0);
|
if (IS_ERR(ep->re_pd)) {
|
rc = PTR_ERR(ep->re_pd);
|
ep->re_pd = NULL;
|
goto out_destroy;
|
}
|
|
rc = rdma_create_qp(id, ep->re_pd, &ep->re_attr);
|
if (rc)
|
goto out_destroy;
|
|
r_xprt->rx_ep = ep;
|
return 0;
|
|
out_destroy:
|
rpcrdma_ep_put(ep);
|
rdma_destroy_id(id);
|
return rc;
|
}
|
|
/**
|
* rpcrdma_xprt_connect - Connect an unconnected transport
|
* @r_xprt: controlling transport instance
|
*
|
* Returns 0 on success or a negative errno.
|
*/
|
int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpc_xprt *xprt = &r_xprt->rx_xprt;
|
struct rpcrdma_ep *ep;
|
int rc;
|
|
rc = rpcrdma_ep_create(r_xprt);
|
if (rc)
|
return rc;
|
ep = r_xprt->rx_ep;
|
|
xprt_clear_connected(xprt);
|
rpcrdma_reset_cwnd(r_xprt);
|
|
/* Bump the ep's reference count while there are
|
* outstanding Receives.
|
*/
|
rpcrdma_ep_get(ep);
|
rpcrdma_post_recvs(r_xprt, 1, true);
|
|
rc = rdma_connect(ep->re_id, &ep->re_remote_cma);
|
if (rc)
|
goto out;
|
|
if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
|
xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
|
wait_event_interruptible(ep->re_connect_wait,
|
ep->re_connect_status != 0);
|
if (ep->re_connect_status <= 0) {
|
rc = ep->re_connect_status;
|
goto out;
|
}
|
|
rc = rpcrdma_sendctxs_create(r_xprt);
|
if (rc) {
|
rc = -ENOTCONN;
|
goto out;
|
}
|
|
rc = rpcrdma_reqs_setup(r_xprt);
|
if (rc) {
|
rc = -ENOTCONN;
|
goto out;
|
}
|
rpcrdma_mrs_create(r_xprt);
|
|
out:
|
trace_xprtrdma_connect(r_xprt, rc);
|
return rc;
|
}
|
|
/**
|
* rpcrdma_xprt_disconnect - Disconnect underlying transport
|
* @r_xprt: controlling transport instance
|
*
|
* Caller serializes. Either the transport send lock is held,
|
* or we're being called to destroy the transport.
|
*
|
* On return, @r_xprt is completely divested of all hardware
|
* resources and prepared for the next ->connect operation.
|
*/
|
void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_ep *ep = r_xprt->rx_ep;
|
struct rdma_cm_id *id;
|
int rc;
|
|
if (!ep)
|
return;
|
|
id = ep->re_id;
|
rc = rdma_disconnect(id);
|
trace_xprtrdma_disconnect(r_xprt, rc);
|
|
rpcrdma_xprt_drain(r_xprt);
|
rpcrdma_reps_unmap(r_xprt);
|
rpcrdma_reqs_reset(r_xprt);
|
rpcrdma_mrs_destroy(r_xprt);
|
rpcrdma_sendctxs_destroy(r_xprt);
|
|
if (rpcrdma_ep_put(ep))
|
rdma_destroy_id(id);
|
|
r_xprt->rx_ep = NULL;
|
}
|
|
/* Fixed-size circular FIFO queue. This implementation is wait-free and
|
* lock-free.
|
*
|
* Consumer is the code path that posts Sends. This path dequeues a
|
* sendctx for use by a Send operation. Multiple consumer threads
|
* are serialized by the RPC transport lock, which allows only one
|
* ->send_request call at a time.
|
*
|
* Producer is the code path that handles Send completions. This path
|
* enqueues a sendctx that has been completed. Multiple producer
|
* threads are serialized by the ib_poll_cq() function.
|
*/
|
|
/* rpcrdma_sendctxs_destroy() assumes caller has already quiesced
|
* queue activity, and rpcrdma_xprt_drain has flushed all remaining
|
* Send requests.
|
*/
|
static void rpcrdma_sendctxs_destroy(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
unsigned long i;
|
|
if (!buf->rb_sc_ctxs)
|
return;
|
for (i = 0; i <= buf->rb_sc_last; i++)
|
kfree(buf->rb_sc_ctxs[i]);
|
kfree(buf->rb_sc_ctxs);
|
buf->rb_sc_ctxs = NULL;
|
}
|
|
static struct rpcrdma_sendctx *rpcrdma_sendctx_create(struct rpcrdma_ep *ep)
|
{
|
struct rpcrdma_sendctx *sc;
|
|
sc = kzalloc(struct_size(sc, sc_sges, ep->re_attr.cap.max_send_sge),
|
GFP_KERNEL);
|
if (!sc)
|
return NULL;
|
|
sc->sc_cqe.done = rpcrdma_wc_send;
|
return sc;
|
}
|
|
static int rpcrdma_sendctxs_create(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_sendctx *sc;
|
unsigned long i;
|
|
/* Maximum number of concurrent outstanding Send WRs. Capping
|
* the circular queue size stops Send Queue overflow by causing
|
* the ->send_request call to fail temporarily before too many
|
* Sends are posted.
|
*/
|
i = r_xprt->rx_ep->re_max_requests + RPCRDMA_MAX_BC_REQUESTS;
|
buf->rb_sc_ctxs = kcalloc(i, sizeof(sc), GFP_KERNEL);
|
if (!buf->rb_sc_ctxs)
|
return -ENOMEM;
|
|
buf->rb_sc_last = i - 1;
|
for (i = 0; i <= buf->rb_sc_last; i++) {
|
sc = rpcrdma_sendctx_create(r_xprt->rx_ep);
|
if (!sc)
|
return -ENOMEM;
|
|
buf->rb_sc_ctxs[i] = sc;
|
}
|
|
buf->rb_sc_head = 0;
|
buf->rb_sc_tail = 0;
|
return 0;
|
}
|
|
/* The sendctx queue is not guaranteed to have a size that is a
|
* power of two, thus the helpers in circ_buf.h cannot be used.
|
* The other option is to use modulus (%), which can be expensive.
|
*/
|
static unsigned long rpcrdma_sendctx_next(struct rpcrdma_buffer *buf,
|
unsigned long item)
|
{
|
return likely(item < buf->rb_sc_last) ? item + 1 : 0;
|
}
|
|
/**
|
* rpcrdma_sendctx_get_locked - Acquire a send context
|
* @r_xprt: controlling transport instance
|
*
|
* Returns pointer to a free send completion context; or NULL if
|
* the queue is empty.
|
*
|
* Usage: Called to acquire an SGE array before preparing a Send WR.
|
*
|
* The caller serializes calls to this function (per transport), and
|
* provides an effective memory barrier that flushes the new value
|
* of rb_sc_head.
|
*/
|
struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_sendctx *sc;
|
unsigned long next_head;
|
|
next_head = rpcrdma_sendctx_next(buf, buf->rb_sc_head);
|
|
if (next_head == READ_ONCE(buf->rb_sc_tail))
|
goto out_emptyq;
|
|
/* ORDER: item must be accessed _before_ head is updated */
|
sc = buf->rb_sc_ctxs[next_head];
|
|
/* Releasing the lock in the caller acts as a memory
|
* barrier that flushes rb_sc_head.
|
*/
|
buf->rb_sc_head = next_head;
|
|
return sc;
|
|
out_emptyq:
|
/* The queue is "empty" if there have not been enough Send
|
* completions recently. This is a sign the Send Queue is
|
* backing up. Cause the caller to pause and try again.
|
*/
|
xprt_wait_for_buffer_space(&r_xprt->rx_xprt);
|
r_xprt->rx_stats.empty_sendctx_q++;
|
return NULL;
|
}
|
|
/**
|
* rpcrdma_sendctx_put_locked - Release a send context
|
* @r_xprt: controlling transport instance
|
* @sc: send context to release
|
*
|
* Usage: Called from Send completion to return a sendctxt
|
* to the queue.
|
*
|
* The caller serializes calls to this function (per transport).
|
*/
|
static void rpcrdma_sendctx_put_locked(struct rpcrdma_xprt *r_xprt,
|
struct rpcrdma_sendctx *sc)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
unsigned long next_tail;
|
|
/* Unmap SGEs of previously completed but unsignaled
|
* Sends by walking up the queue until @sc is found.
|
*/
|
next_tail = buf->rb_sc_tail;
|
do {
|
next_tail = rpcrdma_sendctx_next(buf, next_tail);
|
|
/* ORDER: item must be accessed _before_ tail is updated */
|
rpcrdma_sendctx_unmap(buf->rb_sc_ctxs[next_tail]);
|
|
} while (buf->rb_sc_ctxs[next_tail] != sc);
|
|
/* Paired with READ_ONCE */
|
smp_store_release(&buf->rb_sc_tail, next_tail);
|
|
xprt_write_space(&r_xprt->rx_xprt);
|
}
|
|
static void
|
rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_ep *ep = r_xprt->rx_ep;
|
unsigned int count;
|
|
for (count = 0; count < ep->re_max_rdma_segs; count++) {
|
struct rpcrdma_mr *mr;
|
int rc;
|
|
mr = kzalloc(sizeof(*mr), GFP_NOFS);
|
if (!mr)
|
break;
|
|
rc = frwr_mr_init(r_xprt, mr);
|
if (rc) {
|
kfree(mr);
|
break;
|
}
|
|
spin_lock(&buf->rb_lock);
|
rpcrdma_mr_push(mr, &buf->rb_mrs);
|
list_add(&mr->mr_all, &buf->rb_all_mrs);
|
spin_unlock(&buf->rb_lock);
|
}
|
|
r_xprt->rx_stats.mrs_allocated += count;
|
trace_xprtrdma_createmrs(r_xprt, count);
|
}
|
|
static void
|
rpcrdma_mr_refresh_worker(struct work_struct *work)
|
{
|
struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
|
rb_refresh_worker);
|
struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
|
rx_buf);
|
|
rpcrdma_mrs_create(r_xprt);
|
xprt_write_space(&r_xprt->rx_xprt);
|
}
|
|
/**
|
* rpcrdma_mrs_refresh - Wake the MR refresh worker
|
* @r_xprt: controlling transport instance
|
*
|
*/
|
void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_ep *ep = r_xprt->rx_ep;
|
|
/* If there is no underlying connection, it's no use
|
* to wake the refresh worker.
|
*/
|
if (ep->re_connect_status == 1) {
|
/* The work is scheduled on a WQ_MEM_RECLAIM
|
* workqueue in order to prevent MR allocation
|
* from recursing into NFS during direct reclaim.
|
*/
|
queue_work(xprtiod_workqueue, &buf->rb_refresh_worker);
|
}
|
}
|
|
/**
|
* rpcrdma_req_create - Allocate an rpcrdma_req object
|
* @r_xprt: controlling r_xprt
|
* @size: initial size, in bytes, of send and receive buffers
|
* @flags: GFP flags passed to memory allocators
|
*
|
* Returns an allocated and fully initialized rpcrdma_req or NULL.
|
*/
|
struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size,
|
gfp_t flags)
|
{
|
struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
|
struct rpcrdma_req *req;
|
|
req = kzalloc(sizeof(*req), flags);
|
if (req == NULL)
|
goto out1;
|
|
req->rl_sendbuf = rpcrdma_regbuf_alloc(size, DMA_TO_DEVICE, flags);
|
if (!req->rl_sendbuf)
|
goto out2;
|
|
req->rl_recvbuf = rpcrdma_regbuf_alloc(size, DMA_NONE, flags);
|
if (!req->rl_recvbuf)
|
goto out3;
|
|
INIT_LIST_HEAD(&req->rl_free_mrs);
|
INIT_LIST_HEAD(&req->rl_registered);
|
spin_lock(&buffer->rb_lock);
|
list_add(&req->rl_all, &buffer->rb_allreqs);
|
spin_unlock(&buffer->rb_lock);
|
return req;
|
|
out3:
|
rpcrdma_regbuf_free(req->rl_sendbuf);
|
out2:
|
kfree(req);
|
out1:
|
return NULL;
|
}
|
|
/**
|
* rpcrdma_req_setup - Per-connection instance setup of an rpcrdma_req object
|
* @r_xprt: controlling transport instance
|
* @req: rpcrdma_req object to set up
|
*
|
* Returns zero on success, and a negative errno on failure.
|
*/
|
int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
|
{
|
struct rpcrdma_regbuf *rb;
|
size_t maxhdrsize;
|
|
/* Compute maximum header buffer size in bytes */
|
maxhdrsize = rpcrdma_fixed_maxsz + 3 +
|
r_xprt->rx_ep->re_max_rdma_segs * rpcrdma_readchunk_maxsz;
|
maxhdrsize *= sizeof(__be32);
|
rb = rpcrdma_regbuf_alloc(__roundup_pow_of_two(maxhdrsize),
|
DMA_TO_DEVICE, GFP_KERNEL);
|
if (!rb)
|
goto out;
|
|
if (!__rpcrdma_regbuf_dma_map(r_xprt, rb))
|
goto out_free;
|
|
req->rl_rdmabuf = rb;
|
xdr_buf_init(&req->rl_hdrbuf, rdmab_data(rb), rdmab_length(rb));
|
return 0;
|
|
out_free:
|
rpcrdma_regbuf_free(rb);
|
out:
|
return -ENOMEM;
|
}
|
|
/* ASSUMPTION: the rb_allreqs list is stable for the duration,
|
* and thus can be walked without holding rb_lock. Eg. the
|
* caller is holding the transport send lock to exclude
|
* device removal or disconnection.
|
*/
|
static int rpcrdma_reqs_setup(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_req *req;
|
int rc;
|
|
list_for_each_entry(req, &buf->rb_allreqs, rl_all) {
|
rc = rpcrdma_req_setup(r_xprt, req);
|
if (rc)
|
return rc;
|
}
|
return 0;
|
}
|
|
static void rpcrdma_req_reset(struct rpcrdma_req *req)
|
{
|
/* Credits are valid for only one connection */
|
req->rl_slot.rq_cong = 0;
|
|
rpcrdma_regbuf_free(req->rl_rdmabuf);
|
req->rl_rdmabuf = NULL;
|
|
rpcrdma_regbuf_dma_unmap(req->rl_sendbuf);
|
rpcrdma_regbuf_dma_unmap(req->rl_recvbuf);
|
|
frwr_reset(req);
|
}
|
|
/* ASSUMPTION: the rb_allreqs list is stable for the duration,
|
* and thus can be walked without holding rb_lock. Eg. the
|
* caller is holding the transport send lock to exclude
|
* device removal or disconnection.
|
*/
|
static void rpcrdma_reqs_reset(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_req *req;
|
|
list_for_each_entry(req, &buf->rb_allreqs, rl_all)
|
rpcrdma_req_reset(req);
|
}
|
|
/* No locking needed here. This function is called only by the
|
* Receive completion handler.
|
*/
|
static noinline
|
struct rpcrdma_rep *rpcrdma_rep_create(struct rpcrdma_xprt *r_xprt,
|
bool temp)
|
{
|
struct rpcrdma_rep *rep;
|
|
rep = kzalloc(sizeof(*rep), GFP_KERNEL);
|
if (rep == NULL)
|
goto out;
|
|
rep->rr_rdmabuf = rpcrdma_regbuf_alloc(r_xprt->rx_ep->re_inline_recv,
|
DMA_FROM_DEVICE, GFP_KERNEL);
|
if (!rep->rr_rdmabuf)
|
goto out_free;
|
|
xdr_buf_init(&rep->rr_hdrbuf, rdmab_data(rep->rr_rdmabuf),
|
rdmab_length(rep->rr_rdmabuf));
|
rep->rr_cqe.done = rpcrdma_wc_receive;
|
rep->rr_rxprt = r_xprt;
|
rep->rr_recv_wr.next = NULL;
|
rep->rr_recv_wr.wr_cqe = &rep->rr_cqe;
|
rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
|
rep->rr_recv_wr.num_sge = 1;
|
rep->rr_temp = temp;
|
list_add(&rep->rr_all, &r_xprt->rx_buf.rb_all_reps);
|
return rep;
|
|
out_free:
|
kfree(rep);
|
out:
|
return NULL;
|
}
|
|
/* No locking needed here. This function is invoked only by the
|
* Receive completion handler, or during transport shutdown.
|
*/
|
static void rpcrdma_rep_destroy(struct rpcrdma_rep *rep)
|
{
|
list_del(&rep->rr_all);
|
rpcrdma_regbuf_free(rep->rr_rdmabuf);
|
kfree(rep);
|
}
|
|
static struct rpcrdma_rep *rpcrdma_rep_get_locked(struct rpcrdma_buffer *buf)
|
{
|
struct llist_node *node;
|
|
/* Calls to llist_del_first are required to be serialized */
|
node = llist_del_first(&buf->rb_free_reps);
|
if (!node)
|
return NULL;
|
return llist_entry(node, struct rpcrdma_rep, rr_node);
|
}
|
|
static void rpcrdma_rep_put(struct rpcrdma_buffer *buf,
|
struct rpcrdma_rep *rep)
|
{
|
llist_add(&rep->rr_node, &buf->rb_free_reps);
|
}
|
|
static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_rep *rep;
|
|
list_for_each_entry(rep, &buf->rb_all_reps, rr_all) {
|
rpcrdma_regbuf_dma_unmap(rep->rr_rdmabuf);
|
rep->rr_temp = true;
|
}
|
}
|
|
static void rpcrdma_reps_destroy(struct rpcrdma_buffer *buf)
|
{
|
struct rpcrdma_rep *rep;
|
|
while ((rep = rpcrdma_rep_get_locked(buf)) != NULL)
|
rpcrdma_rep_destroy(rep);
|
}
|
|
/**
|
* rpcrdma_buffer_create - Create initial set of req/rep objects
|
* @r_xprt: transport instance to (re)initialize
|
*
|
* Returns zero on success, otherwise a negative errno.
|
*/
|
int rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
int i, rc;
|
|
buf->rb_bc_srv_max_requests = 0;
|
spin_lock_init(&buf->rb_lock);
|
INIT_LIST_HEAD(&buf->rb_mrs);
|
INIT_LIST_HEAD(&buf->rb_all_mrs);
|
INIT_WORK(&buf->rb_refresh_worker, rpcrdma_mr_refresh_worker);
|
|
INIT_LIST_HEAD(&buf->rb_send_bufs);
|
INIT_LIST_HEAD(&buf->rb_allreqs);
|
INIT_LIST_HEAD(&buf->rb_all_reps);
|
|
rc = -ENOMEM;
|
for (i = 0; i < r_xprt->rx_xprt.max_reqs; i++) {
|
struct rpcrdma_req *req;
|
|
req = rpcrdma_req_create(r_xprt, RPCRDMA_V1_DEF_INLINE_SIZE * 2,
|
GFP_KERNEL);
|
if (!req)
|
goto out;
|
list_add(&req->rl_list, &buf->rb_send_bufs);
|
}
|
|
init_llist_head(&buf->rb_free_reps);
|
|
return 0;
|
out:
|
rpcrdma_buffer_destroy(buf);
|
return rc;
|
}
|
|
/**
|
* rpcrdma_req_destroy - Destroy an rpcrdma_req object
|
* @req: unused object to be destroyed
|
*
|
* Relies on caller holding the transport send lock to protect
|
* removing req->rl_all from buf->rb_all_reqs safely.
|
*/
|
void rpcrdma_req_destroy(struct rpcrdma_req *req)
|
{
|
struct rpcrdma_mr *mr;
|
|
list_del(&req->rl_all);
|
|
while ((mr = rpcrdma_mr_pop(&req->rl_free_mrs))) {
|
struct rpcrdma_buffer *buf = &mr->mr_xprt->rx_buf;
|
|
spin_lock(&buf->rb_lock);
|
list_del(&mr->mr_all);
|
spin_unlock(&buf->rb_lock);
|
|
frwr_release_mr(mr);
|
}
|
|
rpcrdma_regbuf_free(req->rl_recvbuf);
|
rpcrdma_regbuf_free(req->rl_sendbuf);
|
rpcrdma_regbuf_free(req->rl_rdmabuf);
|
kfree(req);
|
}
|
|
/**
|
* rpcrdma_mrs_destroy - Release all of a transport's MRs
|
* @r_xprt: controlling transport instance
|
*
|
* Relies on caller holding the transport send lock to protect
|
* removing mr->mr_list from req->rl_free_mrs safely.
|
*/
|
static void rpcrdma_mrs_destroy(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_mr *mr;
|
|
cancel_work_sync(&buf->rb_refresh_worker);
|
|
spin_lock(&buf->rb_lock);
|
while ((mr = list_first_entry_or_null(&buf->rb_all_mrs,
|
struct rpcrdma_mr,
|
mr_all)) != NULL) {
|
list_del(&mr->mr_list);
|
list_del(&mr->mr_all);
|
spin_unlock(&buf->rb_lock);
|
|
frwr_release_mr(mr);
|
|
spin_lock(&buf->rb_lock);
|
}
|
spin_unlock(&buf->rb_lock);
|
}
|
|
/**
|
* rpcrdma_buffer_destroy - Release all hw resources
|
* @buf: root control block for resources
|
*
|
* ORDERING: relies on a prior rpcrdma_xprt_drain :
|
* - No more Send or Receive completions can occur
|
* - All MRs, reps, and reqs are returned to their free lists
|
*/
|
void
|
rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
|
{
|
rpcrdma_reps_destroy(buf);
|
|
while (!list_empty(&buf->rb_send_bufs)) {
|
struct rpcrdma_req *req;
|
|
req = list_first_entry(&buf->rb_send_bufs,
|
struct rpcrdma_req, rl_list);
|
list_del(&req->rl_list);
|
rpcrdma_req_destroy(req);
|
}
|
}
|
|
/**
|
* rpcrdma_mr_get - Allocate an rpcrdma_mr object
|
* @r_xprt: controlling transport
|
*
|
* Returns an initialized rpcrdma_mr or NULL if no free
|
* rpcrdma_mr objects are available.
|
*/
|
struct rpcrdma_mr *
|
rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_mr *mr;
|
|
spin_lock(&buf->rb_lock);
|
mr = rpcrdma_mr_pop(&buf->rb_mrs);
|
spin_unlock(&buf->rb_lock);
|
return mr;
|
}
|
|
/**
|
* rpcrdma_mr_put - DMA unmap an MR and release it
|
* @mr: MR to release
|
*
|
*/
|
void rpcrdma_mr_put(struct rpcrdma_mr *mr)
|
{
|
struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
|
|
if (mr->mr_dir != DMA_NONE) {
|
trace_xprtrdma_mr_unmap(mr);
|
ib_dma_unmap_sg(r_xprt->rx_ep->re_id->device,
|
mr->mr_sg, mr->mr_nents, mr->mr_dir);
|
mr->mr_dir = DMA_NONE;
|
}
|
|
rpcrdma_mr_push(mr, &mr->mr_req->rl_free_mrs);
|
}
|
|
/**
|
* rpcrdma_reply_put - Put reply buffers back into pool
|
* @buffers: buffer pool
|
* @req: object to return
|
*
|
*/
|
void rpcrdma_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req)
|
{
|
if (req->rl_reply) {
|
rpcrdma_rep_put(buffers, req->rl_reply);
|
req->rl_reply = NULL;
|
}
|
}
|
|
/**
|
* rpcrdma_buffer_get - Get a request buffer
|
* @buffers: Buffer pool from which to obtain a buffer
|
*
|
* Returns a fresh rpcrdma_req, or NULL if none are available.
|
*/
|
struct rpcrdma_req *
|
rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
|
{
|
struct rpcrdma_req *req;
|
|
spin_lock(&buffers->rb_lock);
|
req = list_first_entry_or_null(&buffers->rb_send_bufs,
|
struct rpcrdma_req, rl_list);
|
if (req)
|
list_del_init(&req->rl_list);
|
spin_unlock(&buffers->rb_lock);
|
return req;
|
}
|
|
/**
|
* rpcrdma_buffer_put - Put request/reply buffers back into pool
|
* @buffers: buffer pool
|
* @req: object to return
|
*
|
*/
|
void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req)
|
{
|
rpcrdma_reply_put(buffers, req);
|
|
spin_lock(&buffers->rb_lock);
|
list_add(&req->rl_list, &buffers->rb_send_bufs);
|
spin_unlock(&buffers->rb_lock);
|
}
|
|
/**
|
* rpcrdma_recv_buffer_put - Release rpcrdma_rep back to free list
|
* @rep: rep to release
|
*
|
* Used after error conditions.
|
*/
|
void rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
|
{
|
rpcrdma_rep_put(&rep->rr_rxprt->rx_buf, rep);
|
}
|
|
/* Returns a pointer to a rpcrdma_regbuf object, or NULL.
|
*
|
* xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
|
* receiving the payload of RDMA RECV operations. During Long Calls
|
* or Replies they may be registered externally via frwr_map.
|
*/
|
static struct rpcrdma_regbuf *
|
rpcrdma_regbuf_alloc(size_t size, enum dma_data_direction direction,
|
gfp_t flags)
|
{
|
struct rpcrdma_regbuf *rb;
|
|
rb = kmalloc(sizeof(*rb), flags);
|
if (!rb)
|
return NULL;
|
rb->rg_data = kmalloc(size, flags);
|
if (!rb->rg_data) {
|
kfree(rb);
|
return NULL;
|
}
|
|
rb->rg_device = NULL;
|
rb->rg_direction = direction;
|
rb->rg_iov.length = size;
|
return rb;
|
}
|
|
/**
|
* rpcrdma_regbuf_realloc - re-allocate a SEND/RECV buffer
|
* @rb: regbuf to reallocate
|
* @size: size of buffer to be allocated, in bytes
|
* @flags: GFP flags
|
*
|
* Returns true if reallocation was successful. If false is
|
* returned, @rb is left untouched.
|
*/
|
bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size, gfp_t flags)
|
{
|
void *buf;
|
|
buf = kmalloc(size, flags);
|
if (!buf)
|
return false;
|
|
rpcrdma_regbuf_dma_unmap(rb);
|
kfree(rb->rg_data);
|
|
rb->rg_data = buf;
|
rb->rg_iov.length = size;
|
return true;
|
}
|
|
/**
|
* __rpcrdma_regbuf_dma_map - DMA-map a regbuf
|
* @r_xprt: controlling transport instance
|
* @rb: regbuf to be mapped
|
*
|
* Returns true if the buffer is now DMA mapped to @r_xprt's device
|
*/
|
bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
|
struct rpcrdma_regbuf *rb)
|
{
|
struct ib_device *device = r_xprt->rx_ep->re_id->device;
|
|
if (rb->rg_direction == DMA_NONE)
|
return false;
|
|
rb->rg_iov.addr = ib_dma_map_single(device, rdmab_data(rb),
|
rdmab_length(rb), rb->rg_direction);
|
if (ib_dma_mapping_error(device, rdmab_addr(rb))) {
|
trace_xprtrdma_dma_maperr(rdmab_addr(rb));
|
return false;
|
}
|
|
rb->rg_device = device;
|
rb->rg_iov.lkey = r_xprt->rx_ep->re_pd->local_dma_lkey;
|
return true;
|
}
|
|
static void rpcrdma_regbuf_dma_unmap(struct rpcrdma_regbuf *rb)
|
{
|
if (!rb)
|
return;
|
|
if (!rpcrdma_regbuf_is_mapped(rb))
|
return;
|
|
ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb), rdmab_length(rb),
|
rb->rg_direction);
|
rb->rg_device = NULL;
|
}
|
|
static void rpcrdma_regbuf_free(struct rpcrdma_regbuf *rb)
|
{
|
rpcrdma_regbuf_dma_unmap(rb);
|
if (rb)
|
kfree(rb->rg_data);
|
kfree(rb);
|
}
|
|
/**
|
* rpcrdma_post_sends - Post WRs to a transport's Send Queue
|
* @r_xprt: controlling transport instance
|
* @req: rpcrdma_req containing the Send WR to post
|
*
|
* Returns 0 if the post was successful, otherwise -ENOTCONN
|
* is returned.
|
*/
|
int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
|
{
|
struct ib_send_wr *send_wr = &req->rl_wr;
|
struct rpcrdma_ep *ep = r_xprt->rx_ep;
|
int rc;
|
|
if (!ep->re_send_count || kref_read(&req->rl_kref) > 1) {
|
send_wr->send_flags |= IB_SEND_SIGNALED;
|
ep->re_send_count = ep->re_send_batch;
|
} else {
|
send_wr->send_flags &= ~IB_SEND_SIGNALED;
|
--ep->re_send_count;
|
}
|
|
trace_xprtrdma_post_send(req);
|
rc = frwr_send(r_xprt, req);
|
if (rc)
|
return -ENOTCONN;
|
return 0;
|
}
|
|
/**
|
* rpcrdma_post_recvs - Refill the Receive Queue
|
* @r_xprt: controlling transport instance
|
* @needed: current credit grant
|
* @temp: mark Receive buffers to be deleted after one use
|
*
|
*/
|
void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed, bool temp)
|
{
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
struct rpcrdma_ep *ep = r_xprt->rx_ep;
|
struct ib_recv_wr *wr, *bad_wr;
|
struct rpcrdma_rep *rep;
|
int count, rc;
|
|
rc = 0;
|
count = 0;
|
|
if (likely(ep->re_receive_count > needed))
|
goto out;
|
needed -= ep->re_receive_count;
|
if (!temp)
|
needed += RPCRDMA_MAX_RECV_BATCH;
|
|
/* fast path: all needed reps can be found on the free list */
|
wr = NULL;
|
while (needed) {
|
rep = rpcrdma_rep_get_locked(buf);
|
if (rep && rep->rr_temp) {
|
rpcrdma_rep_destroy(rep);
|
continue;
|
}
|
if (!rep)
|
rep = rpcrdma_rep_create(r_xprt, temp);
|
if (!rep)
|
break;
|
if (!rpcrdma_regbuf_dma_map(r_xprt, rep->rr_rdmabuf)) {
|
rpcrdma_rep_put(buf, rep);
|
break;
|
}
|
|
trace_xprtrdma_post_recv(rep);
|
rep->rr_recv_wr.next = wr;
|
wr = &rep->rr_recv_wr;
|
--needed;
|
++count;
|
}
|
if (!wr)
|
goto out;
|
|
rc = ib_post_recv(ep->re_id->qp, wr,
|
(const struct ib_recv_wr **)&bad_wr);
|
out:
|
trace_xprtrdma_post_recvs(r_xprt, count, rc);
|
if (rc) {
|
for (wr = bad_wr; wr;) {
|
struct rpcrdma_rep *rep;
|
|
rep = container_of(wr, struct rpcrdma_rep, rr_recv_wr);
|
wr = wr->next;
|
rpcrdma_recv_buffer_put(rep);
|
--count;
|
}
|
}
|
ep->re_receive_count += count;
|
return;
|
}
|
