![Tom Tucker](/assets/img/avatar_default.png)
The svcrdma transport was un-marshalling requests in-place. This resulted in sparse warnings due to __beXX data containing both NBO and HBO data. The code has been restructured to do byte-swapping as the header is parsed instead of when the header is validated immediately after receipt. Also moved extern declarations for the workqueue and memory pools to the private header file. Signed-off-by: Tom Tucker <tom@ogc.us> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1358 lines
38 KiB
C
1358 lines
38 KiB
C
/*
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* Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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#include <linux/sunrpc/svc_xprt.h>
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#include <linux/sunrpc/debug.h>
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#include <linux/sunrpc/rpc_rdma.h>
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#include <linux/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 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 dto_tasklet_func(unsigned long data);
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static void svc_rdma_detach(struct svc_xprt *xprt);
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static void svc_rdma_free(struct svc_xprt *xprt);
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static int svc_rdma_has_wspace(struct svc_xprt *xprt);
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static void rq_cq_reap(struct svcxprt_rdma *xprt);
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static void sq_cq_reap(struct svcxprt_rdma *xprt);
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static DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL);
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static DEFINE_SPINLOCK(dto_lock);
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static LIST_HEAD(dto_xprt_q);
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static struct svc_xprt_ops svc_rdma_ops = {
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.xpo_create = svc_rdma_create,
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.xpo_recvfrom = svc_rdma_recvfrom,
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.xpo_sendto = svc_rdma_sendto,
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.xpo_release_rqst = svc_rdma_release_rqst,
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.xpo_detach = svc_rdma_detach,
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.xpo_free = svc_rdma_free,
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.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
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.xpo_has_wspace = svc_rdma_has_wspace,
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.xpo_accept = svc_rdma_accept,
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};
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struct svc_xprt_class svc_rdma_class = {
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.xcl_name = "rdma",
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.xcl_owner = THIS_MODULE,
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.xcl_ops = &svc_rdma_ops,
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.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
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};
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struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
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{
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struct svc_rdma_op_ctxt *ctxt;
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while (1) {
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ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, GFP_KERNEL);
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if (ctxt)
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break;
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schedule_timeout_uninterruptible(msecs_to_jiffies(500));
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}
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ctxt->xprt = xprt;
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INIT_LIST_HEAD(&ctxt->dto_q);
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ctxt->count = 0;
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ctxt->frmr = NULL;
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atomic_inc(&xprt->sc_ctxt_used);
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return ctxt;
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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 sc_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_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;
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int i;
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BUG_ON(!ctxt);
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xprt = ctxt->xprt;
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if (free_pages)
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for (i = 0; i < ctxt->count; i++)
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put_page(ctxt->pages[i]);
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kmem_cache_free(svc_rdma_ctxt_cachep, ctxt);
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atomic_dec(&xprt->sc_ctxt_used);
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}
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/*
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* Temporary NFS req mappings are shared across all transport
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* instances. These are short lived and should be bounded by the number
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* of concurrent server threads * depth of the SQ.
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*/
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struct svc_rdma_req_map *svc_rdma_get_req_map(void)
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{
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struct svc_rdma_req_map *map;
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while (1) {
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map = kmem_cache_alloc(svc_rdma_map_cachep, GFP_KERNEL);
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if (map)
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break;
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schedule_timeout_uninterruptible(msecs_to_jiffies(500));
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}
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map->count = 0;
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map->frmr = NULL;
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return map;
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}
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void svc_rdma_put_req_map(struct svc_rdma_req_map *map)
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{
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kmem_cache_free(svc_rdma_map_cachep, map);
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}
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/* ib_cq event handler */
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static void cq_event_handler(struct ib_event *event, void *context)
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{
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struct svc_xprt *xprt = context;
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dprintk("svcrdma: received CQ event id=%d, context=%p\n",
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event->event, context);
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set_bit(XPT_CLOSE, &xprt->xpt_flags);
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}
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/* QP event handler */
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static void qp_event_handler(struct ib_event *event, void *context)
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{
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struct svc_xprt *xprt = context;
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switch (event->event) {
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/* These are considered benign events */
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case IB_EVENT_PATH_MIG:
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case IB_EVENT_COMM_EST:
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case IB_EVENT_SQ_DRAINED:
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case IB_EVENT_QP_LAST_WQE_REACHED:
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dprintk("svcrdma: QP event %d received for QP=%p\n",
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event->event, event->element.qp);
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break;
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/* These are considered fatal events */
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case IB_EVENT_PATH_MIG_ERR:
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case IB_EVENT_QP_FATAL:
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case IB_EVENT_QP_REQ_ERR:
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case IB_EVENT_QP_ACCESS_ERR:
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case IB_EVENT_DEVICE_FATAL:
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default:
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dprintk("svcrdma: QP ERROR event %d received for QP=%p, "
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"closing transport\n",
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event->event, event->element.qp);
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set_bit(XPT_CLOSE, &xprt->xpt_flags);
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break;
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}
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}
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/*
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* Data Transfer Operation Tasklet
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*
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* Walks a list of transports with I/O pending, removing entries as
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* they are added to the server's I/O pending list. Two bits indicate
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* if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave
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* spinlock that serializes access to the transport list with the RQ
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* and SQ interrupt handlers.
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*/
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static void dto_tasklet_func(unsigned long data)
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{
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struct svcxprt_rdma *xprt;
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unsigned long flags;
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spin_lock_irqsave(&dto_lock, flags);
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while (!list_empty(&dto_xprt_q)) {
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xprt = list_entry(dto_xprt_q.next,
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struct svcxprt_rdma, sc_dto_q);
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list_del_init(&xprt->sc_dto_q);
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spin_unlock_irqrestore(&dto_lock, flags);
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rq_cq_reap(xprt);
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sq_cq_reap(xprt);
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svc_xprt_put(&xprt->sc_xprt);
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spin_lock_irqsave(&dto_lock, flags);
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}
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spin_unlock_irqrestore(&dto_lock, flags);
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}
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/*
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* Receive Queue Completion Handler
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*
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* Since an RQ completion handler is called on interrupt context, we
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* need to defer the handling of the I/O to a tasklet
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*/
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static void rq_comp_handler(struct ib_cq *cq, void *cq_context)
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{
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struct svcxprt_rdma *xprt = cq_context;
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unsigned long flags;
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/* Guard against unconditional flush call for destroyed QP */
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if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
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return;
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/*
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* Set the bit regardless of whether or not it's on the list
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* because it may be on the list already due to an SQ
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* completion.
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*/
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set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags);
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/*
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* If this transport is not already on the DTO transport queue,
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* add it
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*/
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spin_lock_irqsave(&dto_lock, flags);
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if (list_empty(&xprt->sc_dto_q)) {
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svc_xprt_get(&xprt->sc_xprt);
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list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
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}
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spin_unlock_irqrestore(&dto_lock, flags);
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/* Tasklet does all the work to avoid irqsave locks. */
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tasklet_schedule(&dto_tasklet);
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}
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/*
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* rq_cq_reap - Process the RQ CQ.
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*
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* Take all completing WC off the CQE and enqueue the associated DTO
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* context on the dto_q for the transport.
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*
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* Note that caller must hold a transport reference.
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*/
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static void rq_cq_reap(struct svcxprt_rdma *xprt)
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{
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int ret;
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struct ib_wc wc;
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struct svc_rdma_op_ctxt *ctxt = NULL;
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if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags))
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return;
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ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP);
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atomic_inc(&rdma_stat_rq_poll);
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while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) {
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ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
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ctxt->wc_status = wc.status;
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ctxt->byte_len = wc.byte_len;
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svc_rdma_unmap_dma(ctxt);
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if (wc.status != IB_WC_SUCCESS) {
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/* Close the transport */
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dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt);
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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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svc_rdma_put_context(ctxt, 1);
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svc_xprt_put(&xprt->sc_xprt);
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continue;
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}
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spin_lock_bh(&xprt->sc_rq_dto_lock);
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list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
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spin_unlock_bh(&xprt->sc_rq_dto_lock);
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svc_xprt_put(&xprt->sc_xprt);
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}
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if (ctxt)
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atomic_inc(&rdma_stat_rq_prod);
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set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
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/*
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* If data arrived before established event,
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* don't enqueue. This defers RPC I/O until the
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* RDMA connection is complete.
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*/
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if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
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svc_xprt_enqueue(&xprt->sc_xprt);
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}
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/*
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* Process a completion context
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*/
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static void process_context(struct svcxprt_rdma *xprt,
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struct svc_rdma_op_ctxt *ctxt)
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{
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svc_rdma_unmap_dma(ctxt);
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switch (ctxt->wr_op) {
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case IB_WR_SEND:
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if (test_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags))
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svc_rdma_put_frmr(xprt, ctxt->frmr);
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svc_rdma_put_context(ctxt, 1);
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break;
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case IB_WR_RDMA_WRITE:
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svc_rdma_put_context(ctxt, 0);
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break;
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case IB_WR_RDMA_READ:
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case IB_WR_RDMA_READ_WITH_INV:
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if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
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struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr;
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BUG_ON(!read_hdr);
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if (test_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags))
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svc_rdma_put_frmr(xprt, ctxt->frmr);
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spin_lock_bh(&xprt->sc_rq_dto_lock);
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set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
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list_add_tail(&read_hdr->dto_q,
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&xprt->sc_read_complete_q);
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spin_unlock_bh(&xprt->sc_rq_dto_lock);
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svc_xprt_enqueue(&xprt->sc_xprt);
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}
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svc_rdma_put_context(ctxt, 0);
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break;
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default:
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printk(KERN_ERR "svcrdma: unexpected completion type, "
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"opcode=%d\n",
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ctxt->wr_op);
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break;
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}
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}
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/*
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* Send Queue Completion Handler - potentially called on interrupt context.
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*
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* Note that caller must hold a transport reference.
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*/
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static void sq_cq_reap(struct svcxprt_rdma *xprt)
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{
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struct svc_rdma_op_ctxt *ctxt = NULL;
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struct ib_wc wc;
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struct ib_cq *cq = xprt->sc_sq_cq;
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int ret;
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if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags))
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return;
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ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP);
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atomic_inc(&rdma_stat_sq_poll);
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while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) {
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if (wc.status != IB_WC_SUCCESS)
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/* Close the transport */
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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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/* Decrement used SQ WR count */
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atomic_dec(&xprt->sc_sq_count);
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wake_up(&xprt->sc_send_wait);
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ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
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if (ctxt)
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process_context(xprt, ctxt);
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svc_xprt_put(&xprt->sc_xprt);
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}
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if (ctxt)
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atomic_inc(&rdma_stat_sq_prod);
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}
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static void sq_comp_handler(struct ib_cq *cq, void *cq_context)
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{
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struct svcxprt_rdma *xprt = cq_context;
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unsigned long flags;
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/* Guard against unconditional flush call for destroyed QP */
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if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
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return;
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/*
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* Set the bit regardless of whether or not it's on the list
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* because it may be on the list already due to an RQ
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* completion.
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*/
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set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags);
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/*
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* If this transport is not already on the DTO transport queue,
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* add it
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*/
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spin_lock_irqsave(&dto_lock, flags);
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if (list_empty(&xprt->sc_dto_q)) {
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svc_xprt_get(&xprt->sc_xprt);
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list_add_tail(&xprt->sc_dto_q, &dto_xprt_q);
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}
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spin_unlock_irqrestore(&dto_lock, flags);
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/* Tasklet does all the work to avoid irqsave locks. */
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tasklet_schedule(&dto_tasklet);
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}
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static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
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int listener)
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{
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struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
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|
|
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_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);
|
|
|
|
cma_xprt->sc_ord = svcrdma_ord;
|
|
|
|
cma_xprt->sc_max_req_size = svcrdma_max_req_size;
|
|
cma_xprt->sc_max_requests = svcrdma_max_requests;
|
|
cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT;
|
|
atomic_set(&cma_xprt->sc_sq_count, 0);
|
|
atomic_set(&cma_xprt->sc_ctxt_used, 0);
|
|
|
|
if (listener)
|
|
set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
|
|
|
|
return cma_xprt;
|
|
}
|
|
|
|
struct page *svc_rdma_get_page(void)
|
|
{
|
|
struct page *page;
|
|
|
|
while ((page = alloc_page(GFP_KERNEL)) == NULL) {
|
|
/* If we can't get memory, wait a bit and try again */
|
|
printk(KERN_INFO "svcrdma: out of memory...retrying in 1000 "
|
|
"jiffies.\n");
|
|
schedule_timeout_uninterruptible(msecs_to_jiffies(1000));
|
|
}
|
|
return page;
|
|
}
|
|
|
|
int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
|
|
{
|
|
struct ib_recv_wr recv_wr, *bad_recv_wr;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
struct page *page;
|
|
dma_addr_t pa;
|
|
int sge_no;
|
|
int buflen;
|
|
int ret;
|
|
|
|
ctxt = svc_rdma_get_context(xprt);
|
|
buflen = 0;
|
|
ctxt->direction = DMA_FROM_DEVICE;
|
|
for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
|
|
BUG_ON(sge_no >= xprt->sc_max_sge);
|
|
page = svc_rdma_get_page();
|
|
ctxt->pages[sge_no] = page;
|
|
pa = ib_dma_map_page(xprt->sc_cm_id->device,
|
|
page, 0, PAGE_SIZE,
|
|
DMA_FROM_DEVICE);
|
|
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_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_id = (u64)(unsigned long)ctxt;
|
|
|
|
svc_xprt_get(&xprt->sc_xprt);
|
|
ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
|
|
if (ret) {
|
|
svc_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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* Can't use svc_xprt_received here because we are not on a
|
|
* rqstp thread
|
|
*/
|
|
set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&listen_xprt->sc_xprt);
|
|
}
|
|
|
|
/*
|
|
* Handles events generated on the listening endpoint. These events will be
|
|
* either be incoming connect requests or adapter removal events.
|
|
*/
|
|
static int rdma_listen_handler(struct rdma_cm_id *cma_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
struct svcxprt_rdma *xprt = cma_id->context;
|
|
int ret = 0;
|
|
|
|
switch (event->event) {
|
|
case RDMA_CM_EVENT_CONNECT_REQUEST:
|
|
dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
|
|
"event=%d\n", cma_id, cma_id->context, event->event);
|
|
handle_connect_req(cma_id,
|
|
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=%d\n", cma_id, event->event);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rdma_cma_handler(struct rdma_cm_id *cma_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
struct svc_xprt *xprt = cma_id->context;
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
switch (event->event) {
|
|
case RDMA_CM_EVENT_ESTABLISHED:
|
|
/* Accept complete */
|
|
svc_xprt_get(xprt);
|
|
dprintk("svcrdma: Connection completed on DTO xprt=%p, "
|
|
"cm_id=%p\n", xprt, cma_id);
|
|
clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
break;
|
|
case RDMA_CM_EVENT_DISCONNECTED:
|
|
dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
|
|
xprt, cma_id);
|
|
if (xprt) {
|
|
set_bit(XPT_CLOSE, &xprt->xpt_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
svc_xprt_put(xprt);
|
|
}
|
|
break;
|
|
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
|
dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
|
|
"event=%d\n", cma_id, xprt, event->event);
|
|
if (xprt) {
|
|
set_bit(XPT_CLOSE, &xprt->xpt_flags);
|
|
svc_xprt_enqueue(xprt);
|
|
}
|
|
break;
|
|
default:
|
|
dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
|
|
"event=%d\n", cma_id, event->event);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create a listening RDMA service endpoint.
|
|
*/
|
|
static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
|
|
struct net *net,
|
|
struct sockaddr *sa, int salen,
|
|
int flags)
|
|
{
|
|
struct rdma_cm_id *listen_id;
|
|
struct svcxprt_rdma *cma_xprt;
|
|
struct svc_xprt *xprt;
|
|
int ret;
|
|
|
|
dprintk("svcrdma: Creating RDMA socket\n");
|
|
if (sa->sa_family != AF_INET) {
|
|
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);
|
|
xprt = &cma_xprt->sc_xprt;
|
|
|
|
listen_id = rdma_create_id(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;
|
|
}
|
|
|
|
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 ib_fast_reg_page_list *pl;
|
|
struct svc_rdma_fastreg_mr *frmr;
|
|
|
|
frmr = kmalloc(sizeof(*frmr), GFP_KERNEL);
|
|
if (!frmr)
|
|
goto err;
|
|
|
|
mr = ib_alloc_fast_reg_mr(xprt->sc_pd, RPCSVC_MAXPAGES);
|
|
if (IS_ERR(mr))
|
|
goto err_free_frmr;
|
|
|
|
pl = ib_alloc_fast_reg_page_list(xprt->sc_cm_id->device,
|
|
RPCSVC_MAXPAGES);
|
|
if (IS_ERR(pl))
|
|
goto err_free_mr;
|
|
|
|
frmr->mr = mr;
|
|
frmr->page_list = pl;
|
|
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);
|
|
ib_dereg_mr(frmr->mr);
|
|
ib_free_fast_reg_page_list(frmr->page_list);
|
|
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->map_len = 0;
|
|
frmr->page_list_len = 0;
|
|
}
|
|
spin_unlock_bh(&rdma->sc_frmr_q_lock);
|
|
if (frmr)
|
|
return frmr;
|
|
|
|
return rdma_alloc_frmr(rdma);
|
|
}
|
|
|
|
static void frmr_unmap_dma(struct svcxprt_rdma *xprt,
|
|
struct svc_rdma_fastreg_mr *frmr)
|
|
{
|
|
int page_no;
|
|
for (page_no = 0; page_no < frmr->page_list_len; page_no++) {
|
|
dma_addr_t addr = frmr->page_list->page_list[page_no];
|
|
if (ib_dma_mapping_error(frmr->mr->device, addr))
|
|
continue;
|
|
atomic_dec(&xprt->sc_dma_used);
|
|
ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE,
|
|
frmr->direction);
|
|
}
|
|
}
|
|
|
|
void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
|
|
struct svc_rdma_fastreg_mr *frmr)
|
|
{
|
|
if (frmr) {
|
|
frmr_unmap_dma(rdma, frmr);
|
|
spin_lock_bh(&rdma->sc_frmr_q_lock);
|
|
BUG_ON(!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_attr devattr;
|
|
int uninitialized_var(dma_mr_acc);
|
|
int need_dma_mr;
|
|
int ret;
|
|
int i;
|
|
|
|
listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
clear_bit(XPT_CONN, &xprt->xpt_flags);
|
|
/* Get the next entry off the accept list */
|
|
spin_lock_bh(&listen_rdma->sc_lock);
|
|
if (!list_empty(&listen_rdma->sc_accept_q)) {
|
|
newxprt = list_entry(listen_rdma->sc_accept_q.next,
|
|
struct svcxprt_rdma, sc_accept_q);
|
|
list_del_init(&newxprt->sc_accept_q);
|
|
}
|
|
if (!list_empty(&listen_rdma->sc_accept_q))
|
|
set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
|
|
spin_unlock_bh(&listen_rdma->sc_lock);
|
|
if (!newxprt)
|
|
return NULL;
|
|
|
|
dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
|
|
newxprt, newxprt->sc_cm_id);
|
|
|
|
ret = ib_query_device(newxprt->sc_cm_id->device, &devattr);
|
|
if (ret) {
|
|
dprintk("svcrdma: could not query device attributes on "
|
|
"device %p, rc=%d\n", newxprt->sc_cm_id->device, ret);
|
|
goto errout;
|
|
}
|
|
|
|
/* Qualify the transport resource defaults with the
|
|
* capabilities of this particular device */
|
|
newxprt->sc_max_sge = min((size_t)devattr.max_sge,
|
|
(size_t)RPCSVC_MAXPAGES);
|
|
newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr,
|
|
(size_t)svcrdma_max_requests);
|
|
newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests;
|
|
|
|
/*
|
|
* Limit ORD based on client limit, local device limit, and
|
|
* configured svcrdma limit.
|
|
*/
|
|
newxprt->sc_ord = min_t(size_t, devattr.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(newxprt->sc_cm_id->device);
|
|
if (IS_ERR(newxprt->sc_pd)) {
|
|
dprintk("svcrdma: error creating PD for connect request\n");
|
|
goto errout;
|
|
}
|
|
newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device,
|
|
sq_comp_handler,
|
|
cq_event_handler,
|
|
newxprt,
|
|
newxprt->sc_sq_depth,
|
|
0);
|
|
if (IS_ERR(newxprt->sc_sq_cq)) {
|
|
dprintk("svcrdma: error creating SQ CQ for connect request\n");
|
|
goto errout;
|
|
}
|
|
newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device,
|
|
rq_comp_handler,
|
|
cq_event_handler,
|
|
newxprt,
|
|
newxprt->sc_max_requests,
|
|
0);
|
|
if (IS_ERR(newxprt->sc_rq_cq)) {
|
|
dprintk("svcrdma: error creating RQ CQ for connect request\n");
|
|
goto errout;
|
|
}
|
|
|
|
memset(&qp_attr, 0, sizeof qp_attr);
|
|
qp_attr.event_handler = qp_event_handler;
|
|
qp_attr.qp_context = &newxprt->sc_xprt;
|
|
qp_attr.cap.max_send_wr = newxprt->sc_sq_depth;
|
|
qp_attr.cap.max_recv_wr = newxprt->sc_max_requests;
|
|
qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
|
|
qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
|
|
qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
|
qp_attr.qp_type = IB_QPT_RC;
|
|
qp_attr.send_cq = newxprt->sc_sq_cq;
|
|
qp_attr.recv_cq = newxprt->sc_rq_cq;
|
|
dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n"
|
|
" cm_id->device=%p, sc_pd->device=%p\n"
|
|
" cap.max_send_wr = %d\n"
|
|
" cap.max_recv_wr = %d\n"
|
|
" cap.max_send_sge = %d\n"
|
|
" cap.max_recv_sge = %d\n",
|
|
newxprt->sc_cm_id, newxprt->sc_pd,
|
|
newxprt->sc_cm_id->device, newxprt->sc_pd->device,
|
|
qp_attr.cap.max_send_wr,
|
|
qp_attr.cap.max_recv_wr,
|
|
qp_attr.cap.max_send_sge,
|
|
qp_attr.cap.max_recv_sge);
|
|
|
|
ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
|
|
if (ret) {
|
|
/*
|
|
* XXX: This is a hack. We need a xx_request_qp interface
|
|
* that will adjust the qp_attr's with a best-effort
|
|
* number
|
|
*/
|
|
qp_attr.cap.max_send_sge -= 2;
|
|
qp_attr.cap.max_recv_sge -= 2;
|
|
ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd,
|
|
&qp_attr);
|
|
if (ret) {
|
|
dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
|
|
goto errout;
|
|
}
|
|
newxprt->sc_max_sge = qp_attr.cap.max_send_sge;
|
|
newxprt->sc_max_sge = qp_attr.cap.max_recv_sge;
|
|
newxprt->sc_sq_depth = qp_attr.cap.max_send_wr;
|
|
newxprt->sc_max_requests = qp_attr.cap.max_recv_wr;
|
|
}
|
|
newxprt->sc_qp = newxprt->sc_cm_id->qp;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (devattr.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
|
|
newxprt->sc_frmr_pg_list_len =
|
|
devattr.max_fast_reg_page_list_len;
|
|
newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG;
|
|
}
|
|
|
|
/*
|
|
* Determine if a DMA MR is required and if so, what privs are required
|
|
*/
|
|
switch (rdma_node_get_transport(newxprt->sc_cm_id->device->node_type)) {
|
|
case RDMA_TRANSPORT_IWARP:
|
|
newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV;
|
|
if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) {
|
|
need_dma_mr = 1;
|
|
dma_mr_acc =
|
|
(IB_ACCESS_LOCAL_WRITE |
|
|
IB_ACCESS_REMOTE_WRITE);
|
|
} else if (!(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) {
|
|
need_dma_mr = 1;
|
|
dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
|
|
} else
|
|
need_dma_mr = 0;
|
|
break;
|
|
case RDMA_TRANSPORT_IB:
|
|
if (!(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) {
|
|
need_dma_mr = 1;
|
|
dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
|
|
} else
|
|
need_dma_mr = 0;
|
|
break;
|
|
default:
|
|
goto errout;
|
|
}
|
|
|
|
/* Create the DMA MR if needed, otherwise, use the DMA LKEY */
|
|
if (need_dma_mr) {
|
|
/* Register all of physical memory */
|
|
newxprt->sc_phys_mr =
|
|
ib_get_dma_mr(newxprt->sc_pd, dma_mr_acc);
|
|
if (IS_ERR(newxprt->sc_phys_mr)) {
|
|
dprintk("svcrdma: Failed to create DMA MR ret=%d\n",
|
|
ret);
|
|
goto errout;
|
|
}
|
|
newxprt->sc_dma_lkey = newxprt->sc_phys_mr->lkey;
|
|
} else
|
|
newxprt->sc_dma_lkey =
|
|
newxprt->sc_cm_id->device->local_dma_lkey;
|
|
|
|
/* Post receive buffers */
|
|
for (i = 0; i < newxprt->sc_max_requests; i++) {
|
|
ret = svc_rdma_post_recv(newxprt);
|
|
if (ret) {
|
|
dprintk("svcrdma: failure posting receive buffers\n");
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
/* Swap out the handler */
|
|
newxprt->sc_cm_id->event_handler = rdma_cma_handler;
|
|
|
|
/*
|
|
* Arm the CQs for the SQ and RQ before accepting so we can't
|
|
* miss the first message
|
|
*/
|
|
ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP);
|
|
ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP);
|
|
|
|
/* Accept Connection */
|
|
set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
|
|
memset(&conn_param, 0, sizeof conn_param);
|
|
conn_param.responder_resources = 0;
|
|
conn_param.initiator_depth = newxprt->sc_ord;
|
|
ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
|
|
if (ret) {
|
|
dprintk("svcrdma: failed to accept new connection, ret=%d\n",
|
|
ret);
|
|
goto errout;
|
|
}
|
|
|
|
dprintk("svcrdma: new connection %p accepted with the following "
|
|
"attributes:\n"
|
|
" local_ip : %pI4\n"
|
|
" local_port : %d\n"
|
|
" remote_ip : %pI4\n"
|
|
" remote_port : %d\n"
|
|
" max_sge : %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_sq_depth,
|
|
newxprt->sc_max_requests,
|
|
newxprt->sc_ord);
|
|
|
|
return &newxprt->sc_xprt;
|
|
|
|
errout:
|
|
dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
|
|
/* Take a reference in case the DTO handler runs */
|
|
svc_xprt_get(&newxprt->sc_xprt);
|
|
if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
|
|
ib_destroy_qp(newxprt->sc_qp);
|
|
rdma_destroy_id(newxprt->sc_cm_id);
|
|
/* This call to put will destroy the transport */
|
|
svc_xprt_put(&newxprt->sc_xprt);
|
|
return NULL;
|
|
}
|
|
|
|
static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* When connected, an svc_xprt has at least two references:
|
|
*
|
|
* - A reference held by the cm_id between the ESTABLISHED and
|
|
* DISCONNECTED events. If the remote peer disconnected first, this
|
|
* reference could be gone.
|
|
*
|
|
* - A reference held by the svc_recv code that called this function
|
|
* as part of close processing.
|
|
*
|
|
* At a minimum one references should still be held.
|
|
*/
|
|
static void svc_rdma_detach(struct svc_xprt *xprt)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
dprintk("svc: svc_rdma_detach(%p)\n", xprt);
|
|
|
|
/* Disconnect and flush posted WQE */
|
|
rdma_disconnect(rdma->sc_cm_id);
|
|
}
|
|
|
|
static void __svc_rdma_free(struct work_struct *work)
|
|
{
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(work, struct svcxprt_rdma, sc_work);
|
|
dprintk("svcrdma: svc_rdma_free(%p)\n", rdma);
|
|
|
|
/* We should only be called from kref_put */
|
|
BUG_ON(atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0);
|
|
|
|
/*
|
|
* Destroy queued, but not processed read completions. Note
|
|
* that this cleanup has to be done before destroying the
|
|
* cm_id because the device ptr is needed to unmap the dma in
|
|
* svc_rdma_put_context.
|
|
*/
|
|
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 */
|
|
WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0);
|
|
WARN_ON(atomic_read(&rdma->sc_dma_used) != 0);
|
|
|
|
/* De-allocate fastreg mr */
|
|
rdma_dealloc_frmr_q(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_destroy_cq(rdma->sc_sq_cq);
|
|
|
|
if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
|
|
ib_destroy_cq(rdma->sc_rq_cq);
|
|
|
|
if (rdma->sc_phys_mr && !IS_ERR(rdma->sc_phys_mr))
|
|
ib_dereg_mr(rdma->sc_phys_mr);
|
|
|
|
if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
|
|
ib_dealloc_pd(rdma->sc_pd);
|
|
|
|
/* Destroy the CM ID */
|
|
rdma_destroy_id(rdma->sc_cm_id);
|
|
|
|
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 fewer SQ WR available than required to send a
|
|
* simple response, return false.
|
|
*/
|
|
if ((rdma->sc_sq_depth - atomic_read(&rdma->sc_sq_count) < 3))
|
|
return 0;
|
|
|
|
/*
|
|
* ...or there are already waiters on the SQ,
|
|
* return false.
|
|
*/
|
|
if (waitqueue_active(&rdma->sc_send_wait))
|
|
return 0;
|
|
|
|
/* Otherwise return true. */
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Attempt to register the kvec representing the RPC memory with the
|
|
* device.
|
|
*
|
|
* Returns:
|
|
* NULL : The device does not support fastreg or there were no more
|
|
* fastreg mr.
|
|
* frmr : The kvec register request was successfully posted.
|
|
* <0 : An error was encountered attempting to register the kvec.
|
|
*/
|
|
int svc_rdma_fastreg(struct svcxprt_rdma *xprt,
|
|
struct svc_rdma_fastreg_mr *frmr)
|
|
{
|
|
struct ib_send_wr fastreg_wr;
|
|
u8 key;
|
|
|
|
/* Bump the key */
|
|
key = (u8)(frmr->mr->lkey & 0x000000FF);
|
|
ib_update_fast_reg_key(frmr->mr, ++key);
|
|
|
|
/* Prepare FASTREG WR */
|
|
memset(&fastreg_wr, 0, sizeof fastreg_wr);
|
|
fastreg_wr.opcode = IB_WR_FAST_REG_MR;
|
|
fastreg_wr.send_flags = IB_SEND_SIGNALED;
|
|
fastreg_wr.wr.fast_reg.iova_start = (unsigned long)frmr->kva;
|
|
fastreg_wr.wr.fast_reg.page_list = frmr->page_list;
|
|
fastreg_wr.wr.fast_reg.page_list_len = frmr->page_list_len;
|
|
fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
|
|
fastreg_wr.wr.fast_reg.length = frmr->map_len;
|
|
fastreg_wr.wr.fast_reg.access_flags = frmr->access_flags;
|
|
fastreg_wr.wr.fast_reg.rkey = frmr->mr->lkey;
|
|
return svc_rdma_send(xprt, &fastreg_wr);
|
|
}
|
|
|
|
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;
|
|
|
|
BUG_ON(wr->send_flags != IB_SEND_SIGNALED);
|
|
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);
|
|
|
|
/* See if we can opportunistically reap SQ WR to make room */
|
|
sq_cq_reap(xprt);
|
|
|
|
/* Wait until SQ WR available if SQ still full */
|
|
wait_event(xprt->sc_send_wait,
|
|
atomic_read(&xprt->sc_sq_count) <
|
|
xprt->sc_sq_depth);
|
|
if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
|
|
return -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;
|
|
}
|
|
|
|
void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
|
|
enum rpcrdma_errcode err)
|
|
{
|
|
struct ib_send_wr err_wr;
|
|
struct page *p;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
u32 *va;
|
|
int length;
|
|
int ret;
|
|
|
|
p = svc_rdma_get_page();
|
|
va = page_address(p);
|
|
|
|
/* XDR encode error */
|
|
length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
|
|
|
|
ctxt = svc_rdma_get_context(xprt);
|
|
ctxt->direction = DMA_FROM_DEVICE;
|
|
ctxt->count = 1;
|
|
ctxt->pages[0] = p;
|
|
|
|
/* Prepare SGE for local address */
|
|
ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device,
|
|
p, 0, length, DMA_FROM_DEVICE);
|
|
if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) {
|
|
put_page(p);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return;
|
|
}
|
|
atomic_inc(&xprt->sc_dma_used);
|
|
ctxt->sge[0].lkey = xprt->sc_dma_lkey;
|
|
ctxt->sge[0].length = length;
|
|
|
|
/* Prepare SEND WR */
|
|
memset(&err_wr, 0, sizeof err_wr);
|
|
ctxt->wr_op = IB_WR_SEND;
|
|
err_wr.wr_id = (unsigned long)ctxt;
|
|
err_wr.sg_list = ctxt->sge;
|
|
err_wr.num_sge = 1;
|
|
err_wr.opcode = IB_WR_SEND;
|
|
err_wr.send_flags = IB_SEND_SIGNALED;
|
|
|
|
/* Post It */
|
|
ret = svc_rdma_send(xprt, &err_wr);
|
|
if (ret) {
|
|
dprintk("svcrdma: Error %d posting send for protocol error\n",
|
|
ret);
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
}
|