![Chuck Lever](/assets/img/avatar_default.png)
If the server has forced a disconnect, the associated QP has not been moved to the Error state, and thus Receives are still posted. Ensure Receives (and any other outstanding WRs) are drained to release resources that can be freed during teardown of the svcrdma_xprt. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1335 lines
36 KiB
C
1335 lines
36 KiB
C
/*
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* Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
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* Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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#include <linux/sunrpc/svc_xprt.h>
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#include <linux/sunrpc/debug.h>
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#include <linux/sunrpc/rpc_rdma.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <linux/sunrpc/svc_rdma.h>
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#include <linux/export.h>
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#include "xprt_rdma.h"
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT
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static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *, int);
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static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
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struct net *net,
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struct sockaddr *sa, int salen,
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int flags);
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static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt);
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static void svc_rdma_release_rqst(struct svc_rqst *);
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static void svc_rdma_detach(struct svc_xprt *xprt);
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static void svc_rdma_free(struct svc_xprt *xprt);
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static int svc_rdma_has_wspace(struct svc_xprt *xprt);
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static int svc_rdma_secure_port(struct svc_rqst *);
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static struct svc_xprt_ops svc_rdma_ops = {
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.xpo_create = svc_rdma_create,
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.xpo_recvfrom = svc_rdma_recvfrom,
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.xpo_sendto = svc_rdma_sendto,
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.xpo_release_rqst = svc_rdma_release_rqst,
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.xpo_detach = svc_rdma_detach,
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.xpo_free = svc_rdma_free,
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.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
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.xpo_has_wspace = svc_rdma_has_wspace,
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.xpo_accept = svc_rdma_accept,
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.xpo_secure_port = svc_rdma_secure_port,
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};
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struct svc_xprt_class svc_rdma_class = {
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.xcl_name = "rdma",
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.xcl_owner = THIS_MODULE,
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.xcl_ops = &svc_rdma_ops,
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.xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA,
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.xcl_ident = XPRT_TRANSPORT_RDMA,
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};
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *,
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struct sockaddr *, int, int);
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static void svc_rdma_bc_detach(struct svc_xprt *);
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static void svc_rdma_bc_free(struct svc_xprt *);
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static struct svc_xprt_ops svc_rdma_bc_ops = {
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.xpo_create = svc_rdma_bc_create,
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.xpo_detach = svc_rdma_bc_detach,
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.xpo_free = svc_rdma_bc_free,
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.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
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.xpo_secure_port = svc_rdma_secure_port,
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};
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struct svc_xprt_class svc_rdma_bc_class = {
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.xcl_name = "rdma-bc",
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.xcl_owner = THIS_MODULE,
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.xcl_ops = &svc_rdma_bc_ops,
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.xcl_max_payload = (1024 - RPCRDMA_HDRLEN_MIN)
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};
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static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv,
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struct net *net,
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struct sockaddr *sa, int salen,
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int flags)
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{
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struct svcxprt_rdma *cma_xprt;
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struct svc_xprt *xprt;
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cma_xprt = rdma_create_xprt(serv, 0);
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if (!cma_xprt)
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return ERR_PTR(-ENOMEM);
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xprt = &cma_xprt->sc_xprt;
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svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv);
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serv->sv_bc_xprt = xprt;
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dprintk("svcrdma: %s(%p)\n", __func__, xprt);
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return xprt;
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}
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static void svc_rdma_bc_detach(struct svc_xprt *xprt)
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{
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dprintk("svcrdma: %s(%p)\n", __func__, xprt);
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}
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static void svc_rdma_bc_free(struct svc_xprt *xprt)
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{
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struct svcxprt_rdma *rdma =
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container_of(xprt, struct svcxprt_rdma, sc_xprt);
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dprintk("svcrdma: %s(%p)\n", __func__, xprt);
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if (xprt)
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kfree(rdma);
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}
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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static struct svc_rdma_op_ctxt *alloc_ctxt(struct svcxprt_rdma *xprt,
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gfp_t flags)
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{
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struct svc_rdma_op_ctxt *ctxt;
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ctxt = kmalloc(sizeof(*ctxt), flags);
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if (ctxt) {
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ctxt->xprt = xprt;
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INIT_LIST_HEAD(&ctxt->free);
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INIT_LIST_HEAD(&ctxt->dto_q);
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}
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return ctxt;
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}
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static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma *xprt)
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{
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unsigned int i;
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/* Each RPC/RDMA credit can consume a number of send
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* and receive WQEs. One ctxt is allocated for each.
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*/
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i = xprt->sc_sq_depth + xprt->sc_rq_depth;
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while (i--) {
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struct svc_rdma_op_ctxt *ctxt;
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ctxt = alloc_ctxt(xprt, GFP_KERNEL);
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if (!ctxt) {
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dprintk("svcrdma: No memory for RDMA ctxt\n");
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return false;
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}
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list_add(&ctxt->free, &xprt->sc_ctxts);
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}
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return true;
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}
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struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
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{
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struct svc_rdma_op_ctxt *ctxt = NULL;
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spin_lock_bh(&xprt->sc_ctxt_lock);
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xprt->sc_ctxt_used++;
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if (list_empty(&xprt->sc_ctxts))
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goto out_empty;
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ctxt = list_first_entry(&xprt->sc_ctxts,
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struct svc_rdma_op_ctxt, free);
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list_del_init(&ctxt->free);
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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out:
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ctxt->count = 0;
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ctxt->frmr = NULL;
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return ctxt;
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out_empty:
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/* Either pre-allocation missed the mark, or send
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* queue accounting is broken.
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*/
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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ctxt = alloc_ctxt(xprt, GFP_NOIO);
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if (ctxt)
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goto out;
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spin_lock_bh(&xprt->sc_ctxt_lock);
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xprt->sc_ctxt_used--;
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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WARN_ONCE(1, "svcrdma: empty RDMA ctxt list?\n");
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return NULL;
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}
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void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
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{
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struct svcxprt_rdma *xprt = ctxt->xprt;
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int i;
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for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) {
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/*
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* Unmap the DMA addr in the SGE if the lkey matches
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* the local_dma_lkey, otherwise, ignore it since it is
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* an FRMR lkey and will be unmapped later when the
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* last WR that uses it completes.
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*/
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if (ctxt->sge[i].lkey == xprt->sc_pd->local_dma_lkey) {
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atomic_dec(&xprt->sc_dma_used);
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ib_dma_unmap_page(xprt->sc_cm_id->device,
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ctxt->sge[i].addr,
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ctxt->sge[i].length,
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ctxt->direction);
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}
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}
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}
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void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
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{
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struct svcxprt_rdma *xprt = ctxt->xprt;
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int i;
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if (free_pages)
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for (i = 0; i < ctxt->count; i++)
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put_page(ctxt->pages[i]);
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spin_lock_bh(&xprt->sc_ctxt_lock);
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xprt->sc_ctxt_used--;
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list_add(&ctxt->free, &xprt->sc_ctxts);
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spin_unlock_bh(&xprt->sc_ctxt_lock);
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}
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static void svc_rdma_destroy_ctxts(struct svcxprt_rdma *xprt)
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{
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while (!list_empty(&xprt->sc_ctxts)) {
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struct svc_rdma_op_ctxt *ctxt;
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ctxt = list_first_entry(&xprt->sc_ctxts,
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struct svc_rdma_op_ctxt, free);
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list_del(&ctxt->free);
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kfree(ctxt);
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}
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}
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static struct svc_rdma_req_map *alloc_req_map(gfp_t flags)
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{
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struct svc_rdma_req_map *map;
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map = kmalloc(sizeof(*map), flags);
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if (map)
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INIT_LIST_HEAD(&map->free);
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return map;
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}
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static bool svc_rdma_prealloc_maps(struct svcxprt_rdma *xprt)
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{
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unsigned int i;
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/* One for each receive buffer on this connection. */
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i = xprt->sc_max_requests;
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while (i--) {
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struct svc_rdma_req_map *map;
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map = alloc_req_map(GFP_KERNEL);
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if (!map) {
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dprintk("svcrdma: No memory for request map\n");
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return false;
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}
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list_add(&map->free, &xprt->sc_maps);
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}
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return true;
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}
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struct svc_rdma_req_map *svc_rdma_get_req_map(struct svcxprt_rdma *xprt)
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{
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struct svc_rdma_req_map *map = NULL;
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spin_lock(&xprt->sc_map_lock);
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if (list_empty(&xprt->sc_maps))
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goto out_empty;
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map = list_first_entry(&xprt->sc_maps,
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struct svc_rdma_req_map, free);
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list_del_init(&map->free);
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spin_unlock(&xprt->sc_map_lock);
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out:
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map->count = 0;
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return map;
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out_empty:
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spin_unlock(&xprt->sc_map_lock);
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/* Pre-allocation amount was incorrect */
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map = alloc_req_map(GFP_NOIO);
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if (map)
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goto out;
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WARN_ONCE(1, "svcrdma: empty request map list?\n");
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return NULL;
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}
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void svc_rdma_put_req_map(struct svcxprt_rdma *xprt,
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struct svc_rdma_req_map *map)
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{
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spin_lock(&xprt->sc_map_lock);
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list_add(&map->free, &xprt->sc_maps);
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spin_unlock(&xprt->sc_map_lock);
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}
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static void svc_rdma_destroy_maps(struct svcxprt_rdma *xprt)
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{
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while (!list_empty(&xprt->sc_maps)) {
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struct svc_rdma_req_map *map;
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map = list_first_entry(&xprt->sc_maps,
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struct svc_rdma_req_map, free);
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list_del(&map->free);
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kfree(map);
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}
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}
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/* QP event handler */
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static void qp_event_handler(struct ib_event *event, void *context)
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{
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struct svc_xprt *xprt = context;
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switch (event->event) {
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/* These are considered benign events */
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case IB_EVENT_PATH_MIG:
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case IB_EVENT_COMM_EST:
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case IB_EVENT_SQ_DRAINED:
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case IB_EVENT_QP_LAST_WQE_REACHED:
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dprintk("svcrdma: QP event %s (%d) received for QP=%p\n",
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ib_event_msg(event->event), event->event,
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event->element.qp);
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break;
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/* These are considered fatal events */
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case IB_EVENT_PATH_MIG_ERR:
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case IB_EVENT_QP_FATAL:
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case IB_EVENT_QP_REQ_ERR:
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case IB_EVENT_QP_ACCESS_ERR:
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case IB_EVENT_DEVICE_FATAL:
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default:
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dprintk("svcrdma: QP ERROR event %s (%d) received for QP=%p, "
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"closing transport\n",
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ib_event_msg(event->event), event->event,
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event->element.qp);
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set_bit(XPT_CLOSE, &xprt->xpt_flags);
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break;
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}
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}
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/**
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* svc_rdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
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* @cq: completion queue
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* @wc: completed WR
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*
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*/
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static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct svcxprt_rdma *xprt = cq->cq_context;
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struct ib_cqe *cqe = wc->wr_cqe;
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struct svc_rdma_op_ctxt *ctxt;
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/* WARNING: Only wc->wr_cqe and wc->status are reliable */
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ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe);
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ctxt->wc_status = wc->status;
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svc_rdma_unmap_dma(ctxt);
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if (wc->status != IB_WC_SUCCESS)
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goto flushed;
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/* All wc fields are now known to be valid */
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ctxt->byte_len = wc->byte_len;
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spin_lock(&xprt->sc_rq_dto_lock);
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list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
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spin_unlock(&xprt->sc_rq_dto_lock);
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set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
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if (test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
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goto out;
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svc_xprt_enqueue(&xprt->sc_xprt);
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goto out;
|
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flushed:
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if (wc->status != IB_WC_WR_FLUSH_ERR)
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pr_warn("svcrdma: receive: %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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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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svc_rdma_put_context(ctxt, 1);
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out:
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svc_xprt_put(&xprt->sc_xprt);
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}
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|
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static void svc_rdma_send_wc_common(struct svcxprt_rdma *xprt,
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struct ib_wc *wc,
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const char *opname)
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{
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if (wc->status != IB_WC_SUCCESS)
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goto err;
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out:
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atomic_dec(&xprt->sc_sq_count);
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wake_up(&xprt->sc_send_wait);
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return;
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err:
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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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if (wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("svcrdma: %s: %s (%u/0x%x)\n",
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opname, ib_wc_status_msg(wc->status),
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wc->status, wc->vendor_err);
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goto out;
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}
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|
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static void svc_rdma_send_wc_common_put(struct ib_cq *cq, struct ib_wc *wc,
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const char *opname)
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{
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struct svcxprt_rdma *xprt = cq->cq_context;
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svc_rdma_send_wc_common(xprt, wc, opname);
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svc_xprt_put(&xprt->sc_xprt);
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}
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|
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/**
|
|
* svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC
|
|
* @cq: completion queue
|
|
* @wc: completed WR
|
|
*
|
|
*/
|
|
void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct ib_cqe *cqe = wc->wr_cqe;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
|
|
svc_rdma_send_wc_common_put(cq, wc, "send");
|
|
|
|
ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe);
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
|
|
/**
|
|
* svc_rdma_wc_write - Invoked by RDMA provider for each polled Write WC
|
|
* @cq: completion queue
|
|
* @wc: completed WR
|
|
*
|
|
*/
|
|
void svc_rdma_wc_write(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct ib_cqe *cqe = wc->wr_cqe;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
|
|
svc_rdma_send_wc_common_put(cq, wc, "write");
|
|
|
|
ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe);
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_context(ctxt, 0);
|
|
}
|
|
|
|
/**
|
|
* svc_rdma_wc_reg - Invoked by RDMA provider for each polled FASTREG WC
|
|
* @cq: completion queue
|
|
* @wc: completed WR
|
|
*
|
|
*/
|
|
void svc_rdma_wc_reg(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
svc_rdma_send_wc_common_put(cq, wc, "fastreg");
|
|
}
|
|
|
|
/**
|
|
* svc_rdma_wc_read - Invoked by RDMA provider for each polled Read WC
|
|
* @cq: completion queue
|
|
* @wc: completed WR
|
|
*
|
|
*/
|
|
void svc_rdma_wc_read(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct svcxprt_rdma *xprt = cq->cq_context;
|
|
struct ib_cqe *cqe = wc->wr_cqe;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
|
|
svc_rdma_send_wc_common(xprt, wc, "read");
|
|
|
|
ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe);
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_frmr(xprt, ctxt->frmr);
|
|
|
|
if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
|
|
struct svc_rdma_op_ctxt *read_hdr;
|
|
|
|
read_hdr = ctxt->read_hdr;
|
|
spin_lock(&xprt->sc_rq_dto_lock);
|
|
list_add_tail(&read_hdr->dto_q,
|
|
&xprt->sc_read_complete_q);
|
|
spin_unlock(&xprt->sc_rq_dto_lock);
|
|
|
|
set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&xprt->sc_xprt);
|
|
}
|
|
|
|
svc_rdma_put_context(ctxt, 0);
|
|
svc_xprt_put(&xprt->sc_xprt);
|
|
}
|
|
|
|
/**
|
|
* svc_rdma_wc_inv - Invoked by RDMA provider for each polled LOCAL_INV WC
|
|
* @cq: completion queue
|
|
* @wc: completed WR
|
|
*
|
|
*/
|
|
void svc_rdma_wc_inv(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
svc_rdma_send_wc_common_put(cq, wc, "localInv");
|
|
}
|
|
|
|
static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
|
|
int listener)
|
|
{
|
|
struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
|
|
|
|
if (!cma_xprt)
|
|
return NULL;
|
|
svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_frmr_q);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_ctxts);
|
|
INIT_LIST_HEAD(&cma_xprt->sc_maps);
|
|
init_waitqueue_head(&cma_xprt->sc_send_wait);
|
|
|
|
spin_lock_init(&cma_xprt->sc_lock);
|
|
spin_lock_init(&cma_xprt->sc_rq_dto_lock);
|
|
spin_lock_init(&cma_xprt->sc_frmr_q_lock);
|
|
spin_lock_init(&cma_xprt->sc_ctxt_lock);
|
|
spin_lock_init(&cma_xprt->sc_map_lock);
|
|
|
|
if (listener)
|
|
set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
|
|
|
|
return cma_xprt;
|
|
}
|
|
|
|
int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags)
|
|
{
|
|
struct ib_recv_wr recv_wr, *bad_recv_wr;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
struct page *page;
|
|
dma_addr_t pa;
|
|
int sge_no;
|
|
int buflen;
|
|
int ret;
|
|
|
|
ctxt = svc_rdma_get_context(xprt);
|
|
buflen = 0;
|
|
ctxt->direction = DMA_FROM_DEVICE;
|
|
ctxt->cqe.done = svc_rdma_wc_receive;
|
|
for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
|
|
if (sge_no >= xprt->sc_max_sge) {
|
|
pr_err("svcrdma: Too many sges (%d)\n", sge_no);
|
|
goto err_put_ctxt;
|
|
}
|
|
page = alloc_page(flags);
|
|
if (!page)
|
|
goto err_put_ctxt;
|
|
ctxt->pages[sge_no] = page;
|
|
pa = ib_dma_map_page(xprt->sc_cm_id->device,
|
|
page, 0, PAGE_SIZE,
|
|
DMA_FROM_DEVICE);
|
|
if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa))
|
|
goto err_put_ctxt;
|
|
atomic_inc(&xprt->sc_dma_used);
|
|
ctxt->sge[sge_no].addr = pa;
|
|
ctxt->sge[sge_no].length = PAGE_SIZE;
|
|
ctxt->sge[sge_no].lkey = xprt->sc_pd->local_dma_lkey;
|
|
ctxt->count = sge_no + 1;
|
|
buflen += PAGE_SIZE;
|
|
}
|
|
recv_wr.next = NULL;
|
|
recv_wr.sg_list = &ctxt->sge[0];
|
|
recv_wr.num_sge = ctxt->count;
|
|
recv_wr.wr_cqe = &ctxt->cqe;
|
|
|
|
svc_xprt_get(&xprt->sc_xprt);
|
|
ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
|
|
if (ret) {
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
svc_xprt_put(&xprt->sc_xprt);
|
|
}
|
|
return ret;
|
|
|
|
err_put_ctxt:
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = svc_rdma_post_recv(xprt, flags);
|
|
if (ret) {
|
|
pr_err("svcrdma: could not post a receive buffer, err=%d.\n",
|
|
ret);
|
|
pr_err("svcrdma: closing transport %p.\n", xprt);
|
|
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
|
|
ret = -ENOTCONN;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This function handles the CONNECT_REQUEST event on a listening
|
|
* endpoint. It is passed the cma_id for the _new_ connection. The context in
|
|
* this cma_id is inherited from the listening cma_id and is the svc_xprt
|
|
* structure for the listening endpoint.
|
|
*
|
|
* This function creates a new xprt for the new connection and enqueues it on
|
|
* the accept queue for the listent xprt. When the listen thread is kicked, it
|
|
* will call the recvfrom method on the listen xprt which will accept the new
|
|
* connection.
|
|
*/
|
|
static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird)
|
|
{
|
|
struct svcxprt_rdma *listen_xprt = new_cma_id->context;
|
|
struct svcxprt_rdma *newxprt;
|
|
struct sockaddr *sa;
|
|
|
|
/* Create a new transport */
|
|
newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0);
|
|
if (!newxprt) {
|
|
dprintk("svcrdma: failed to create new transport\n");
|
|
return;
|
|
}
|
|
newxprt->sc_cm_id = new_cma_id;
|
|
new_cma_id->context = newxprt;
|
|
dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
|
|
newxprt, newxprt->sc_cm_id, listen_xprt);
|
|
|
|
/* Save client advertised inbound read limit for use later in accept. */
|
|
newxprt->sc_ord = client_ird;
|
|
|
|
/* Set the local and remote addresses in the transport */
|
|
sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
|
|
svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa));
|
|
sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
|
|
svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
|
|
|
|
/*
|
|
* Enqueue the new transport on the accept queue of the listening
|
|
* transport
|
|
*/
|
|
spin_lock_bh(&listen_xprt->sc_lock);
|
|
list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
|
|
spin_unlock_bh(&listen_xprt->sc_lock);
|
|
|
|
set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&listen_xprt->sc_xprt);
|
|
}
|
|
|
|
/*
|
|
* Handles events generated on the listening endpoint. These events will be
|
|
* either be incoming connect requests or adapter removal events.
|
|
*/
|
|
static int rdma_listen_handler(struct rdma_cm_id *cma_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
struct svcxprt_rdma *xprt = cma_id->context;
|
|
int ret = 0;
|
|
|
|
switch (event->event) {
|
|
case RDMA_CM_EVENT_CONNECT_REQUEST:
|
|
dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
|
|
"event = %s (%d)\n", cma_id, cma_id->context,
|
|
rdma_event_msg(event->event), event->event);
|
|
handle_connect_req(cma_id,
|
|
event->param.conn.initiator_depth);
|
|
break;
|
|
|
|
case RDMA_CM_EVENT_ESTABLISHED:
|
|
/* Accept complete */
|
|
dprintk("svcrdma: Connection completed on LISTEN xprt=%p, "
|
|
"cm_id=%p\n", xprt, cma_id);
|
|
break;
|
|
|
|
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
|
dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
|
|
xprt, cma_id);
|
|
if (xprt)
|
|
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
|
|
break;
|
|
|
|
default:
|
|
dprintk("svcrdma: Unexpected event on listening endpoint %p, "
|
|
"event = %s (%d)\n", cma_id,
|
|
rdma_event_msg(event->event), event->event);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rdma_cma_handler(struct rdma_cm_id *cma_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
struct svc_xprt *xprt = cma_id->context;
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
switch (event->event) {
|
|
case RDMA_CM_EVENT_ESTABLISHED:
|
|
/* Accept complete */
|
|
svc_xprt_get(xprt);
|
|
dprintk("svcrdma: Connection completed on DTO xprt=%p, "
|
|
"cm_id=%p\n", xprt, cma_id);
|
|
clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
break;
|
|
case RDMA_CM_EVENT_DISCONNECTED:
|
|
dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
|
|
xprt, cma_id);
|
|
if (xprt) {
|
|
set_bit(XPT_CLOSE, &xprt->xpt_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
svc_xprt_put(xprt);
|
|
}
|
|
break;
|
|
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
|
dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
|
|
"event = %s (%d)\n", cma_id, xprt,
|
|
rdma_event_msg(event->event), event->event);
|
|
if (xprt) {
|
|
set_bit(XPT_CLOSE, &xprt->xpt_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
svc_xprt_put(xprt);
|
|
}
|
|
break;
|
|
default:
|
|
dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
|
|
"event = %s (%d)\n", cma_id,
|
|
rdma_event_msg(event->event), event->event);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create a listening RDMA service endpoint.
|
|
*/
|
|
static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
|
|
struct net *net,
|
|
struct sockaddr *sa, int salen,
|
|
int flags)
|
|
{
|
|
struct rdma_cm_id *listen_id;
|
|
struct svcxprt_rdma *cma_xprt;
|
|
int ret;
|
|
|
|
dprintk("svcrdma: Creating RDMA socket\n");
|
|
if ((sa->sa_family != AF_INET) && (sa->sa_family != AF_INET6)) {
|
|
dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family);
|
|
return ERR_PTR(-EAFNOSUPPORT);
|
|
}
|
|
cma_xprt = rdma_create_xprt(serv, 1);
|
|
if (!cma_xprt)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
listen_id = rdma_create_id(&init_net, rdma_listen_handler, cma_xprt,
|
|
RDMA_PS_TCP, IB_QPT_RC);
|
|
if (IS_ERR(listen_id)) {
|
|
ret = PTR_ERR(listen_id);
|
|
dprintk("svcrdma: rdma_create_id failed = %d\n", ret);
|
|
goto err0;
|
|
}
|
|
|
|
/* Allow both IPv4 and IPv6 sockets to bind a single port
|
|
* at the same time.
|
|
*/
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
ret = rdma_set_afonly(listen_id, 1);
|
|
if (ret) {
|
|
dprintk("svcrdma: rdma_set_afonly failed = %d\n", ret);
|
|
goto err1;
|
|
}
|
|
#endif
|
|
ret = rdma_bind_addr(listen_id, sa);
|
|
if (ret) {
|
|
dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret);
|
|
goto err1;
|
|
}
|
|
cma_xprt->sc_cm_id = listen_id;
|
|
|
|
ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG);
|
|
if (ret) {
|
|
dprintk("svcrdma: rdma_listen failed = %d\n", ret);
|
|
goto err1;
|
|
}
|
|
|
|
/*
|
|
* We need to use the address from the cm_id in case the
|
|
* caller specified 0 for the port number.
|
|
*/
|
|
sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr;
|
|
svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen);
|
|
|
|
return &cma_xprt->sc_xprt;
|
|
|
|
err1:
|
|
rdma_destroy_id(listen_id);
|
|
err0:
|
|
kfree(cma_xprt);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
|
|
{
|
|
struct ib_mr *mr;
|
|
struct scatterlist *sg;
|
|
struct svc_rdma_fastreg_mr *frmr;
|
|
u32 num_sg;
|
|
|
|
frmr = kmalloc(sizeof(*frmr), GFP_KERNEL);
|
|
if (!frmr)
|
|
goto err;
|
|
|
|
num_sg = min_t(u32, RPCSVC_MAXPAGES, xprt->sc_frmr_pg_list_len);
|
|
mr = ib_alloc_mr(xprt->sc_pd, IB_MR_TYPE_MEM_REG, num_sg);
|
|
if (IS_ERR(mr))
|
|
goto err_free_frmr;
|
|
|
|
sg = kcalloc(RPCSVC_MAXPAGES, sizeof(*sg), GFP_KERNEL);
|
|
if (!sg)
|
|
goto err_free_mr;
|
|
|
|
sg_init_table(sg, RPCSVC_MAXPAGES);
|
|
|
|
frmr->mr = mr;
|
|
frmr->sg = sg;
|
|
INIT_LIST_HEAD(&frmr->frmr_list);
|
|
return frmr;
|
|
|
|
err_free_mr:
|
|
ib_dereg_mr(mr);
|
|
err_free_frmr:
|
|
kfree(frmr);
|
|
err:
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt)
|
|
{
|
|
struct svc_rdma_fastreg_mr *frmr;
|
|
|
|
while (!list_empty(&xprt->sc_frmr_q)) {
|
|
frmr = list_entry(xprt->sc_frmr_q.next,
|
|
struct svc_rdma_fastreg_mr, frmr_list);
|
|
list_del_init(&frmr->frmr_list);
|
|
kfree(frmr->sg);
|
|
ib_dereg_mr(frmr->mr);
|
|
kfree(frmr);
|
|
}
|
|
}
|
|
|
|
struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
|
|
{
|
|
struct svc_rdma_fastreg_mr *frmr = NULL;
|
|
|
|
spin_lock_bh(&rdma->sc_frmr_q_lock);
|
|
if (!list_empty(&rdma->sc_frmr_q)) {
|
|
frmr = list_entry(rdma->sc_frmr_q.next,
|
|
struct svc_rdma_fastreg_mr, frmr_list);
|
|
list_del_init(&frmr->frmr_list);
|
|
frmr->sg_nents = 0;
|
|
}
|
|
spin_unlock_bh(&rdma->sc_frmr_q_lock);
|
|
if (frmr)
|
|
return frmr;
|
|
|
|
return rdma_alloc_frmr(rdma);
|
|
}
|
|
|
|
void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
|
|
struct svc_rdma_fastreg_mr *frmr)
|
|
{
|
|
if (frmr) {
|
|
ib_dma_unmap_sg(rdma->sc_cm_id->device,
|
|
frmr->sg, frmr->sg_nents, frmr->direction);
|
|
atomic_dec(&rdma->sc_dma_used);
|
|
spin_lock_bh(&rdma->sc_frmr_q_lock);
|
|
WARN_ON_ONCE(!list_empty(&frmr->frmr_list));
|
|
list_add(&frmr->frmr_list, &rdma->sc_frmr_q);
|
|
spin_unlock_bh(&rdma->sc_frmr_q_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is the xpo_recvfrom function for listening endpoints. Its
|
|
* purpose is to accept incoming connections. The CMA callback handler
|
|
* has already created a new transport and attached it to the new CMA
|
|
* ID.
|
|
*
|
|
* There is a queue of pending connections hung on the listening
|
|
* transport. This queue contains the new svc_xprt structure. This
|
|
* function takes svc_xprt structures off the accept_q and completes
|
|
* the connection.
|
|
*/
|
|
static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *listen_rdma;
|
|
struct svcxprt_rdma *newxprt = NULL;
|
|
struct rdma_conn_param conn_param;
|
|
struct ib_qp_init_attr qp_attr;
|
|
struct ib_device *dev;
|
|
unsigned int i;
|
|
int ret = 0;
|
|
|
|
listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
clear_bit(XPT_CONN, &xprt->xpt_flags);
|
|
/* Get the next entry off the accept list */
|
|
spin_lock_bh(&listen_rdma->sc_lock);
|
|
if (!list_empty(&listen_rdma->sc_accept_q)) {
|
|
newxprt = list_entry(listen_rdma->sc_accept_q.next,
|
|
struct svcxprt_rdma, sc_accept_q);
|
|
list_del_init(&newxprt->sc_accept_q);
|
|
}
|
|
if (!list_empty(&listen_rdma->sc_accept_q))
|
|
set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
|
|
spin_unlock_bh(&listen_rdma->sc_lock);
|
|
if (!newxprt)
|
|
return NULL;
|
|
|
|
dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
|
|
newxprt, newxprt->sc_cm_id);
|
|
|
|
dev = newxprt->sc_cm_id->device;
|
|
|
|
/* Qualify the transport resource defaults with the
|
|
* capabilities of this particular device */
|
|
newxprt->sc_max_sge = min((size_t)dev->attrs.max_sge,
|
|
(size_t)RPCSVC_MAXPAGES);
|
|
newxprt->sc_max_sge_rd = min_t(size_t, dev->attrs.max_sge_rd,
|
|
RPCSVC_MAXPAGES);
|
|
newxprt->sc_max_req_size = svcrdma_max_req_size;
|
|
newxprt->sc_max_requests = min_t(u32, dev->attrs.max_qp_wr,
|
|
svcrdma_max_requests);
|
|
newxprt->sc_max_bc_requests = min_t(u32, dev->attrs.max_qp_wr,
|
|
svcrdma_max_bc_requests);
|
|
newxprt->sc_rq_depth = newxprt->sc_max_requests +
|
|
newxprt->sc_max_bc_requests;
|
|
newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_rq_depth;
|
|
|
|
if (!svc_rdma_prealloc_ctxts(newxprt))
|
|
goto errout;
|
|
if (!svc_rdma_prealloc_maps(newxprt))
|
|
goto errout;
|
|
|
|
/*
|
|
* Limit ORD based on client limit, local device limit, and
|
|
* configured svcrdma limit.
|
|
*/
|
|
newxprt->sc_ord = min_t(size_t, dev->attrs.max_qp_rd_atom, newxprt->sc_ord);
|
|
newxprt->sc_ord = min_t(size_t, svcrdma_ord, newxprt->sc_ord);
|
|
|
|
newxprt->sc_pd = ib_alloc_pd(dev);
|
|
if (IS_ERR(newxprt->sc_pd)) {
|
|
dprintk("svcrdma: error creating PD for connect request\n");
|
|
goto errout;
|
|
}
|
|
newxprt->sc_sq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_sq_depth,
|
|
0, IB_POLL_SOFTIRQ);
|
|
if (IS_ERR(newxprt->sc_sq_cq)) {
|
|
dprintk("svcrdma: error creating SQ CQ for connect request\n");
|
|
goto errout;
|
|
}
|
|
newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_rq_depth,
|
|
0, IB_POLL_SOFTIRQ);
|
|
if (IS_ERR(newxprt->sc_rq_cq)) {
|
|
dprintk("svcrdma: error creating RQ CQ for connect request\n");
|
|
goto errout;
|
|
}
|
|
|
|
memset(&qp_attr, 0, sizeof qp_attr);
|
|
qp_attr.event_handler = qp_event_handler;
|
|
qp_attr.qp_context = &newxprt->sc_xprt;
|
|
qp_attr.cap.max_send_wr = newxprt->sc_sq_depth;
|
|
qp_attr.cap.max_recv_wr = newxprt->sc_rq_depth;
|
|
qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
|
|
qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
|
|
qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
|
qp_attr.qp_type = IB_QPT_RC;
|
|
qp_attr.send_cq = newxprt->sc_sq_cq;
|
|
qp_attr.recv_cq = newxprt->sc_rq_cq;
|
|
dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n"
|
|
" cm_id->device=%p, sc_pd->device=%p\n"
|
|
" cap.max_send_wr = %d\n"
|
|
" cap.max_recv_wr = %d\n"
|
|
" cap.max_send_sge = %d\n"
|
|
" cap.max_recv_sge = %d\n",
|
|
newxprt->sc_cm_id, newxprt->sc_pd,
|
|
dev, newxprt->sc_pd->device,
|
|
qp_attr.cap.max_send_wr,
|
|
qp_attr.cap.max_recv_wr,
|
|
qp_attr.cap.max_send_sge,
|
|
qp_attr.cap.max_recv_sge);
|
|
|
|
ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
|
|
if (ret) {
|
|
dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
|
|
goto errout;
|
|
}
|
|
newxprt->sc_qp = newxprt->sc_cm_id->qp;
|
|
|
|
/*
|
|
* Use the most secure set of MR resources based on the
|
|
* transport type and available memory management features in
|
|
* the device. Here's the table implemented below:
|
|
*
|
|
* Fast Global DMA Remote WR
|
|
* Reg LKEY MR Access
|
|
* Sup'd Sup'd Needed Needed
|
|
*
|
|
* IWARP N N Y Y
|
|
* N Y Y Y
|
|
* Y N Y N
|
|
* Y Y N -
|
|
*
|
|
* IB N N Y N
|
|
* N Y N -
|
|
* Y N Y N
|
|
* Y Y N -
|
|
*
|
|
* NB: iWARP requires remote write access for the data sink
|
|
* of an RDMA_READ. IB does not.
|
|
*/
|
|
newxprt->sc_reader = rdma_read_chunk_lcl;
|
|
if (dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
|
|
newxprt->sc_frmr_pg_list_len =
|
|
dev->attrs.max_fast_reg_page_list_len;
|
|
newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG;
|
|
newxprt->sc_reader = rdma_read_chunk_frmr;
|
|
}
|
|
|
|
/*
|
|
* Determine if a DMA MR is required and if so, what privs are required
|
|
*/
|
|
if (!rdma_protocol_iwarp(dev, newxprt->sc_cm_id->port_num) &&
|
|
!rdma_ib_or_roce(dev, newxprt->sc_cm_id->port_num))
|
|
goto errout;
|
|
|
|
if (rdma_protocol_iwarp(dev, newxprt->sc_cm_id->port_num))
|
|
newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV;
|
|
|
|
/* Post receive buffers */
|
|
for (i = 0; i < newxprt->sc_max_requests; i++) {
|
|
ret = svc_rdma_post_recv(newxprt, GFP_KERNEL);
|
|
if (ret) {
|
|
dprintk("svcrdma: failure posting receive buffers\n");
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
/* Swap out the handler */
|
|
newxprt->sc_cm_id->event_handler = rdma_cma_handler;
|
|
|
|
/* Accept Connection */
|
|
set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
|
|
memset(&conn_param, 0, sizeof conn_param);
|
|
conn_param.responder_resources = 0;
|
|
conn_param.initiator_depth = newxprt->sc_ord;
|
|
ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
|
|
if (ret) {
|
|
dprintk("svcrdma: failed to accept new connection, ret=%d\n",
|
|
ret);
|
|
goto errout;
|
|
}
|
|
|
|
dprintk("svcrdma: new connection %p accepted with the following "
|
|
"attributes:\n"
|
|
" local_ip : %pI4\n"
|
|
" local_port : %d\n"
|
|
" remote_ip : %pI4\n"
|
|
" remote_port : %d\n"
|
|
" max_sge : %d\n"
|
|
" max_sge_rd : %d\n"
|
|
" sq_depth : %d\n"
|
|
" max_requests : %d\n"
|
|
" ord : %d\n",
|
|
newxprt,
|
|
&((struct sockaddr_in *)&newxprt->sc_cm_id->
|
|
route.addr.src_addr)->sin_addr.s_addr,
|
|
ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
|
|
route.addr.src_addr)->sin_port),
|
|
&((struct sockaddr_in *)&newxprt->sc_cm_id->
|
|
route.addr.dst_addr)->sin_addr.s_addr,
|
|
ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
|
|
route.addr.dst_addr)->sin_port),
|
|
newxprt->sc_max_sge,
|
|
newxprt->sc_max_sge_rd,
|
|
newxprt->sc_sq_depth,
|
|
newxprt->sc_max_requests,
|
|
newxprt->sc_ord);
|
|
|
|
return &newxprt->sc_xprt;
|
|
|
|
errout:
|
|
dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
|
|
/* Take a reference in case the DTO handler runs */
|
|
svc_xprt_get(&newxprt->sc_xprt);
|
|
if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
|
|
ib_destroy_qp(newxprt->sc_qp);
|
|
rdma_destroy_id(newxprt->sc_cm_id);
|
|
/* This call to put will destroy the transport */
|
|
svc_xprt_put(&newxprt->sc_xprt);
|
|
return NULL;
|
|
}
|
|
|
|
static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* When connected, an svc_xprt has at least two references:
|
|
*
|
|
* - A reference held by the cm_id between the ESTABLISHED and
|
|
* DISCONNECTED events. If the remote peer disconnected first, this
|
|
* reference could be gone.
|
|
*
|
|
* - A reference held by the svc_recv code that called this function
|
|
* as part of close processing.
|
|
*
|
|
* At a minimum one references should still be held.
|
|
*/
|
|
static void svc_rdma_detach(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
dprintk("svc: svc_rdma_detach(%p)\n", xprt);
|
|
|
|
/* Disconnect and flush posted WQE */
|
|
rdma_disconnect(rdma->sc_cm_id);
|
|
}
|
|
|
|
static void __svc_rdma_free(struct work_struct *work)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(work, struct svcxprt_rdma, sc_work);
|
|
struct svc_xprt *xprt = &rdma->sc_xprt;
|
|
|
|
dprintk("svcrdma: %s(%p)\n", __func__, rdma);
|
|
|
|
if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
|
|
ib_drain_qp(rdma->sc_qp);
|
|
|
|
/* We should only be called from kref_put */
|
|
if (atomic_read(&xprt->xpt_ref.refcount) != 0)
|
|
pr_err("svcrdma: sc_xprt still in use? (%d)\n",
|
|
atomic_read(&xprt->xpt_ref.refcount));
|
|
|
|
/*
|
|
* Destroy queued, but not processed read completions. Note
|
|
* that this cleanup has to be done before destroying the
|
|
* cm_id because the device ptr is needed to unmap the dma in
|
|
* svc_rdma_put_context.
|
|
*/
|
|
while (!list_empty(&rdma->sc_read_complete_q)) {
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
ctxt = list_entry(rdma->sc_read_complete_q.next,
|
|
struct svc_rdma_op_ctxt,
|
|
dto_q);
|
|
list_del_init(&ctxt->dto_q);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
|
|
/* Destroy queued, but not processed recv completions */
|
|
while (!list_empty(&rdma->sc_rq_dto_q)) {
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
ctxt = list_entry(rdma->sc_rq_dto_q.next,
|
|
struct svc_rdma_op_ctxt,
|
|
dto_q);
|
|
list_del_init(&ctxt->dto_q);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
|
|
/* Warn if we leaked a resource or under-referenced */
|
|
if (rdma->sc_ctxt_used != 0)
|
|
pr_err("svcrdma: ctxt still in use? (%d)\n",
|
|
rdma->sc_ctxt_used);
|
|
if (atomic_read(&rdma->sc_dma_used) != 0)
|
|
pr_err("svcrdma: dma still in use? (%d)\n",
|
|
atomic_read(&rdma->sc_dma_used));
|
|
|
|
/* Final put of backchannel client transport */
|
|
if (xprt->xpt_bc_xprt) {
|
|
xprt_put(xprt->xpt_bc_xprt);
|
|
xprt->xpt_bc_xprt = NULL;
|
|
}
|
|
|
|
rdma_dealloc_frmr_q(rdma);
|
|
svc_rdma_destroy_ctxts(rdma);
|
|
svc_rdma_destroy_maps(rdma);
|
|
|
|
/* Destroy the QP if present (not a listener) */
|
|
if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
|
|
ib_destroy_qp(rdma->sc_qp);
|
|
|
|
if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
|
|
ib_free_cq(rdma->sc_sq_cq);
|
|
|
|
if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
|
|
ib_free_cq(rdma->sc_rq_cq);
|
|
|
|
if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
|
|
ib_dealloc_pd(rdma->sc_pd);
|
|
|
|
/* Destroy the CM ID */
|
|
rdma_destroy_id(rdma->sc_cm_id);
|
|
|
|
kfree(rdma);
|
|
}
|
|
|
|
static void svc_rdma_free(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
INIT_WORK(&rdma->sc_work, __svc_rdma_free);
|
|
queue_work(svc_rdma_wq, &rdma->sc_work);
|
|
}
|
|
|
|
static int svc_rdma_has_wspace(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
|
|
/*
|
|
* If there are already waiters on the SQ,
|
|
* return false.
|
|
*/
|
|
if (waitqueue_active(&rdma->sc_send_wait))
|
|
return 0;
|
|
|
|
/* Otherwise return true. */
|
|
return 1;
|
|
}
|
|
|
|
static int svc_rdma_secure_port(struct svc_rqst *rqstp)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
|
|
{
|
|
struct ib_send_wr *bad_wr, *n_wr;
|
|
int wr_count;
|
|
int i;
|
|
int ret;
|
|
|
|
if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
|
|
return -ENOTCONN;
|
|
|
|
wr_count = 1;
|
|
for (n_wr = wr->next; n_wr; n_wr = n_wr->next)
|
|
wr_count++;
|
|
|
|
/* If the SQ is full, wait until an SQ entry is available */
|
|
while (1) {
|
|
spin_lock_bh(&xprt->sc_lock);
|
|
if (xprt->sc_sq_depth < atomic_read(&xprt->sc_sq_count) + wr_count) {
|
|
spin_unlock_bh(&xprt->sc_lock);
|
|
atomic_inc(&rdma_stat_sq_starve);
|
|
|
|
/* Wait until SQ WR available if SQ still full */
|
|
wait_event(xprt->sc_send_wait,
|
|
atomic_read(&xprt->sc_sq_count) <
|
|
xprt->sc_sq_depth);
|
|
if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
|
|
return -ENOTCONN;
|
|
continue;
|
|
}
|
|
/* Take a transport ref for each WR posted */
|
|
for (i = 0; i < wr_count; i++)
|
|
svc_xprt_get(&xprt->sc_xprt);
|
|
|
|
/* Bump used SQ WR count and post */
|
|
atomic_add(wr_count, &xprt->sc_sq_count);
|
|
ret = ib_post_send(xprt->sc_qp, wr, &bad_wr);
|
|
if (ret) {
|
|
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
|
|
atomic_sub(wr_count, &xprt->sc_sq_count);
|
|
for (i = 0; i < wr_count; i ++)
|
|
svc_xprt_put(&xprt->sc_xprt);
|
|
dprintk("svcrdma: failed to post SQ WR rc=%d, "
|
|
"sc_sq_count=%d, sc_sq_depth=%d\n",
|
|
ret, atomic_read(&xprt->sc_sq_count),
|
|
xprt->sc_sq_depth);
|
|
}
|
|
spin_unlock_bh(&xprt->sc_lock);
|
|
if (ret)
|
|
wake_up(&xprt->sc_send_wait);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|