![Tejun Heo](/assets/img/avatar_default.png)
* Create and use svc_rdma_wq instead of using the system workqueue and flush_scheduled_work(). This workqueue is necessary to serve as flushing domain for rdma->sc_work which is used to destroy itself and thus can't be flushed explicitly. * Replace cancel_delayed_work() + flush_scheduled_work() with cancel_delayed_work_sync(). * Implement synchronous connect in xprt_rdma_connect() using flush_delayed_work() on the rdma_connect work instead of using flush_scheduled_work(). This is to prepare for the deprecation and removal of flush_scheduled_work(). Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
781 lines
22 KiB
C
781 lines
22 KiB
C
/*
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* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* transport.c
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*
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* This file contains the top-level implementation of an RPC RDMA
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* transport.
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*
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* Naming convention: functions beginning with xprt_ are part of the
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* transport switch. All others are RPC RDMA internal.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include "xprt_rdma.h"
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_TRANS
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#endif
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_DESCRIPTION("RPC/RDMA Transport for Linux kernel NFS");
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MODULE_AUTHOR("Network Appliance, Inc.");
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/*
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* tunables
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*/
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static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
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static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
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static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
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static unsigned int xprt_rdma_inline_write_padding;
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static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR;
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int xprt_rdma_pad_optimize = 0;
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#ifdef RPC_DEBUG
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static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
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static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
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static unsigned int zero;
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static unsigned int max_padding = PAGE_SIZE;
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static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
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static unsigned int max_memreg = RPCRDMA_LAST - 1;
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static struct ctl_table_header *sunrpc_table_header;
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static ctl_table xr_tunables_table[] = {
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{
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.procname = "rdma_slot_table_entries",
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.data = &xprt_rdma_slot_table_entries,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_slot_table_size,
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.extra2 = &max_slot_table_size
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},
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{
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.procname = "rdma_max_inline_read",
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.data = &xprt_rdma_max_inline_read,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "rdma_max_inline_write",
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.data = &xprt_rdma_max_inline_write,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "rdma_inline_write_padding",
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.data = &xprt_rdma_inline_write_padding,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &max_padding,
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},
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{
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.procname = "rdma_memreg_strategy",
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.data = &xprt_rdma_memreg_strategy,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_memreg,
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.extra2 = &max_memreg,
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},
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{
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.procname = "rdma_pad_optimize",
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.data = &xprt_rdma_pad_optimize,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{ },
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};
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static ctl_table sunrpc_table[] = {
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{
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.procname = "sunrpc",
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.mode = 0555,
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.child = xr_tunables_table
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},
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{ },
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};
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#endif
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static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */
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static void
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xprt_rdma_format_addresses(struct rpc_xprt *xprt)
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{
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struct sockaddr *sap = (struct sockaddr *)
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&rpcx_to_rdmad(xprt).addr;
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struct sockaddr_in *sin = (struct sockaddr_in *)sap;
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char buf[64];
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(void)rpc_ntop(sap, buf, sizeof(buf));
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xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
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snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
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xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
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xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
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snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
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xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
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snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
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xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
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/* netid */
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xprt->address_strings[RPC_DISPLAY_NETID] = "rdma";
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}
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static void
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xprt_rdma_free_addresses(struct rpc_xprt *xprt)
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{
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unsigned int i;
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for (i = 0; i < RPC_DISPLAY_MAX; i++)
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switch (i) {
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case RPC_DISPLAY_PROTO:
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case RPC_DISPLAY_NETID:
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continue;
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default:
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kfree(xprt->address_strings[i]);
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}
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}
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static void
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xprt_rdma_connect_worker(struct work_struct *work)
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{
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struct rpcrdma_xprt *r_xprt =
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container_of(work, struct rpcrdma_xprt, rdma_connect.work);
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struct rpc_xprt *xprt = &r_xprt->xprt;
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int rc = 0;
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if (!xprt->shutdown) {
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xprt_clear_connected(xprt);
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dprintk("RPC: %s: %sconnect\n", __func__,
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r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
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rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
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if (rc)
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goto out;
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}
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goto out_clear;
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out:
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xprt_wake_pending_tasks(xprt, rc);
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out_clear:
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dprintk("RPC: %s: exit\n", __func__);
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xprt_clear_connecting(xprt);
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}
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/*
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* xprt_rdma_destroy
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*
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* Destroy the xprt.
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* Free all memory associated with the object, including its own.
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* NOTE: none of the *destroy methods free memory for their top-level
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* objects, even though they may have allocated it (they do free
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* private memory). It's up to the caller to handle it. In this
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* case (RDMA transport), all structure memory is inlined with the
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* struct rpcrdma_xprt.
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*/
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static void
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xprt_rdma_destroy(struct rpc_xprt *xprt)
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{
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struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
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int rc;
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dprintk("RPC: %s: called\n", __func__);
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cancel_delayed_work_sync(&r_xprt->rdma_connect);
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xprt_clear_connected(xprt);
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rpcrdma_buffer_destroy(&r_xprt->rx_buf);
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rc = rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
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if (rc)
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dprintk("RPC: %s: rpcrdma_ep_destroy returned %i\n",
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__func__, rc);
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rpcrdma_ia_close(&r_xprt->rx_ia);
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xprt_rdma_free_addresses(xprt);
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xprt_free(xprt);
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dprintk("RPC: %s: returning\n", __func__);
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module_put(THIS_MODULE);
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}
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static const struct rpc_timeout xprt_rdma_default_timeout = {
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.to_initval = 60 * HZ,
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.to_maxval = 60 * HZ,
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};
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/**
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* xprt_setup_rdma - Set up transport to use RDMA
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*
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* @args: rpc transport arguments
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*/
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static struct rpc_xprt *
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xprt_setup_rdma(struct xprt_create *args)
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{
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struct rpcrdma_create_data_internal cdata;
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struct rpc_xprt *xprt;
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struct rpcrdma_xprt *new_xprt;
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struct rpcrdma_ep *new_ep;
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struct sockaddr_in *sin;
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int rc;
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if (args->addrlen > sizeof(xprt->addr)) {
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dprintk("RPC: %s: address too large\n", __func__);
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return ERR_PTR(-EBADF);
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}
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xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
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xprt_rdma_slot_table_entries);
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if (xprt == NULL) {
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dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
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__func__);
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return ERR_PTR(-ENOMEM);
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}
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/* 60 second timeout, no retries */
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xprt->timeout = &xprt_rdma_default_timeout;
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xprt->bind_timeout = (60U * HZ);
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xprt->reestablish_timeout = (5U * HZ);
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xprt->idle_timeout = (5U * 60 * HZ);
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xprt->resvport = 0; /* privileged port not needed */
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xprt->tsh_size = 0; /* RPC-RDMA handles framing */
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xprt->max_payload = RPCRDMA_MAX_DATA_SEGS * PAGE_SIZE;
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xprt->ops = &xprt_rdma_procs;
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/*
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* Set up RDMA-specific connect data.
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*/
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/* Put server RDMA address in local cdata */
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memcpy(&cdata.addr, args->dstaddr, args->addrlen);
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/* Ensure xprt->addr holds valid server TCP (not RDMA)
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* address, for any side protocols which peek at it */
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xprt->prot = IPPROTO_TCP;
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xprt->addrlen = args->addrlen;
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memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);
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sin = (struct sockaddr_in *)&cdata.addr;
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if (ntohs(sin->sin_port) != 0)
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xprt_set_bound(xprt);
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dprintk("RPC: %s: %pI4:%u\n",
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__func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port));
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/* Set max requests */
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cdata.max_requests = xprt->max_reqs;
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/* Set some length limits */
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cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
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cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
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cdata.inline_wsize = xprt_rdma_max_inline_write;
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if (cdata.inline_wsize > cdata.wsize)
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cdata.inline_wsize = cdata.wsize;
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cdata.inline_rsize = xprt_rdma_max_inline_read;
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if (cdata.inline_rsize > cdata.rsize)
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cdata.inline_rsize = cdata.rsize;
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cdata.padding = xprt_rdma_inline_write_padding;
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/*
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* Create new transport instance, which includes initialized
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* o ia
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* o endpoint
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* o buffers
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*/
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new_xprt = rpcx_to_rdmax(xprt);
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rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
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xprt_rdma_memreg_strategy);
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if (rc)
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goto out1;
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/*
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* initialize and create ep
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*/
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new_xprt->rx_data = cdata;
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new_ep = &new_xprt->rx_ep;
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new_ep->rep_remote_addr = cdata.addr;
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rc = rpcrdma_ep_create(&new_xprt->rx_ep,
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&new_xprt->rx_ia, &new_xprt->rx_data);
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if (rc)
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goto out2;
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/*
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* Allocate pre-registered send and receive buffers for headers and
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* any inline data. Also specify any padding which will be provided
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* from a preregistered zero buffer.
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*/
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rc = rpcrdma_buffer_create(&new_xprt->rx_buf, new_ep, &new_xprt->rx_ia,
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&new_xprt->rx_data);
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if (rc)
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goto out3;
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/*
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* Register a callback for connection events. This is necessary because
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* connection loss notification is async. We also catch connection loss
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* when reaping receives.
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*/
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INIT_DELAYED_WORK(&new_xprt->rdma_connect, xprt_rdma_connect_worker);
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new_ep->rep_func = rpcrdma_conn_func;
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new_ep->rep_xprt = xprt;
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xprt_rdma_format_addresses(xprt);
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if (!try_module_get(THIS_MODULE))
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goto out4;
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return xprt;
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out4:
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xprt_rdma_free_addresses(xprt);
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rc = -EINVAL;
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out3:
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(void) rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
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out2:
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rpcrdma_ia_close(&new_xprt->rx_ia);
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out1:
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xprt_free(xprt);
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return ERR_PTR(rc);
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}
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/*
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* Close a connection, during shutdown or timeout/reconnect
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*/
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static void
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xprt_rdma_close(struct rpc_xprt *xprt)
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{
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struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
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dprintk("RPC: %s: closing\n", __func__);
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if (r_xprt->rx_ep.rep_connected > 0)
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xprt->reestablish_timeout = 0;
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xprt_disconnect_done(xprt);
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(void) rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia);
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}
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static void
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xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
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{
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struct sockaddr_in *sap;
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sap = (struct sockaddr_in *)&xprt->addr;
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sap->sin_port = htons(port);
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sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr;
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sap->sin_port = htons(port);
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dprintk("RPC: %s: %u\n", __func__, port);
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}
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static void
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xprt_rdma_connect(struct rpc_task *task)
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{
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struct rpc_xprt *xprt = (struct rpc_xprt *)task->tk_xprt;
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struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
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if (r_xprt->rx_ep.rep_connected != 0) {
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/* Reconnect */
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schedule_delayed_work(&r_xprt->rdma_connect,
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xprt->reestablish_timeout);
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xprt->reestablish_timeout <<= 1;
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if (xprt->reestablish_timeout > (30 * HZ))
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xprt->reestablish_timeout = (30 * HZ);
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else if (xprt->reestablish_timeout < (5 * HZ))
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xprt->reestablish_timeout = (5 * HZ);
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} else {
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schedule_delayed_work(&r_xprt->rdma_connect, 0);
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if (!RPC_IS_ASYNC(task))
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flush_delayed_work(&r_xprt->rdma_connect);
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}
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}
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static int
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xprt_rdma_reserve_xprt(struct rpc_task *task)
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{
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struct rpc_xprt *xprt = task->tk_xprt;
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struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
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int credits = atomic_read(&r_xprt->rx_buf.rb_credits);
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/* == RPC_CWNDSCALE @ init, but *after* setup */
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if (r_xprt->rx_buf.rb_cwndscale == 0UL) {
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r_xprt->rx_buf.rb_cwndscale = xprt->cwnd;
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dprintk("RPC: %s: cwndscale %lu\n", __func__,
|
|
r_xprt->rx_buf.rb_cwndscale);
|
|
BUG_ON(r_xprt->rx_buf.rb_cwndscale <= 0);
|
|
}
|
|
xprt->cwnd = credits * r_xprt->rx_buf.rb_cwndscale;
|
|
return xprt_reserve_xprt_cong(task);
|
|
}
|
|
|
|
/*
|
|
* The RDMA allocate/free functions need the task structure as a place
|
|
* to hide the struct rpcrdma_req, which is necessary for the actual send/recv
|
|
* sequence. For this reason, the recv buffers are attached to send
|
|
* buffers for portions of the RPC. Note that the RPC layer allocates
|
|
* both send and receive buffers in the same call. We may register
|
|
* the receive buffer portion when using reply chunks.
|
|
*/
|
|
static void *
|
|
xprt_rdma_allocate(struct rpc_task *task, size_t size)
|
|
{
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
struct rpcrdma_req *req, *nreq;
|
|
|
|
req = rpcrdma_buffer_get(&rpcx_to_rdmax(xprt)->rx_buf);
|
|
BUG_ON(NULL == req);
|
|
|
|
if (size > req->rl_size) {
|
|
dprintk("RPC: %s: size %zd too large for buffer[%zd]: "
|
|
"prog %d vers %d proc %d\n",
|
|
__func__, size, req->rl_size,
|
|
task->tk_client->cl_prog, task->tk_client->cl_vers,
|
|
task->tk_msg.rpc_proc->p_proc);
|
|
/*
|
|
* Outgoing length shortage. Our inline write max must have
|
|
* been configured to perform direct i/o.
|
|
*
|
|
* This is therefore a large metadata operation, and the
|
|
* allocate call was made on the maximum possible message,
|
|
* e.g. containing long filename(s) or symlink data. In
|
|
* fact, while these metadata operations *might* carry
|
|
* large outgoing payloads, they rarely *do*. However, we
|
|
* have to commit to the request here, so reallocate and
|
|
* register it now. The data path will never require this
|
|
* reallocation.
|
|
*
|
|
* If the allocation or registration fails, the RPC framework
|
|
* will (doggedly) retry.
|
|
*/
|
|
if (rpcx_to_rdmax(xprt)->rx_ia.ri_memreg_strategy ==
|
|
RPCRDMA_BOUNCEBUFFERS) {
|
|
/* forced to "pure inline" */
|
|
dprintk("RPC: %s: too much data (%zd) for inline "
|
|
"(r/w max %d/%d)\n", __func__, size,
|
|
rpcx_to_rdmad(xprt).inline_rsize,
|
|
rpcx_to_rdmad(xprt).inline_wsize);
|
|
size = req->rl_size;
|
|
rpc_exit(task, -EIO); /* fail the operation */
|
|
rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++;
|
|
goto out;
|
|
}
|
|
if (task->tk_flags & RPC_TASK_SWAPPER)
|
|
nreq = kmalloc(sizeof *req + size, GFP_ATOMIC);
|
|
else
|
|
nreq = kmalloc(sizeof *req + size, GFP_NOFS);
|
|
if (nreq == NULL)
|
|
goto outfail;
|
|
|
|
if (rpcrdma_register_internal(&rpcx_to_rdmax(xprt)->rx_ia,
|
|
nreq->rl_base, size + sizeof(struct rpcrdma_req)
|
|
- offsetof(struct rpcrdma_req, rl_base),
|
|
&nreq->rl_handle, &nreq->rl_iov)) {
|
|
kfree(nreq);
|
|
goto outfail;
|
|
}
|
|
rpcx_to_rdmax(xprt)->rx_stats.hardway_register_count += size;
|
|
nreq->rl_size = size;
|
|
nreq->rl_niovs = 0;
|
|
nreq->rl_nchunks = 0;
|
|
nreq->rl_buffer = (struct rpcrdma_buffer *)req;
|
|
nreq->rl_reply = req->rl_reply;
|
|
memcpy(nreq->rl_segments,
|
|
req->rl_segments, sizeof nreq->rl_segments);
|
|
/* flag the swap with an unused field */
|
|
nreq->rl_iov.length = 0;
|
|
req->rl_reply = NULL;
|
|
req = nreq;
|
|
}
|
|
dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req);
|
|
out:
|
|
req->rl_connect_cookie = 0; /* our reserved value */
|
|
return req->rl_xdr_buf;
|
|
|
|
outfail:
|
|
rpcrdma_buffer_put(req);
|
|
rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* This function returns all RDMA resources to the pool.
|
|
*/
|
|
static void
|
|
xprt_rdma_free(void *buffer)
|
|
{
|
|
struct rpcrdma_req *req;
|
|
struct rpcrdma_xprt *r_xprt;
|
|
struct rpcrdma_rep *rep;
|
|
int i;
|
|
|
|
if (buffer == NULL)
|
|
return;
|
|
|
|
req = container_of(buffer, struct rpcrdma_req, rl_xdr_buf[0]);
|
|
if (req->rl_iov.length == 0) { /* see allocate above */
|
|
r_xprt = container_of(((struct rpcrdma_req *) req->rl_buffer)->rl_buffer,
|
|
struct rpcrdma_xprt, rx_buf);
|
|
} else
|
|
r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
|
|
rep = req->rl_reply;
|
|
|
|
dprintk("RPC: %s: called on 0x%p%s\n",
|
|
__func__, rep, (rep && rep->rr_func) ? " (with waiter)" : "");
|
|
|
|
/*
|
|
* Finish the deregistration. When using mw bind, this was
|
|
* begun in rpcrdma_reply_handler(). In all other modes, we
|
|
* do it here, in thread context. The process is considered
|
|
* complete when the rr_func vector becomes NULL - this
|
|
* was put in place during rpcrdma_reply_handler() - the wait
|
|
* call below will not block if the dereg is "done". If
|
|
* interrupted, our framework will clean up.
|
|
*/
|
|
for (i = 0; req->rl_nchunks;) {
|
|
--req->rl_nchunks;
|
|
i += rpcrdma_deregister_external(
|
|
&req->rl_segments[i], r_xprt, NULL);
|
|
}
|
|
|
|
if (rep && wait_event_interruptible(rep->rr_unbind, !rep->rr_func)) {
|
|
rep->rr_func = NULL; /* abandon the callback */
|
|
req->rl_reply = NULL;
|
|
}
|
|
|
|
if (req->rl_iov.length == 0) { /* see allocate above */
|
|
struct rpcrdma_req *oreq = (struct rpcrdma_req *)req->rl_buffer;
|
|
oreq->rl_reply = req->rl_reply;
|
|
(void) rpcrdma_deregister_internal(&r_xprt->rx_ia,
|
|
req->rl_handle,
|
|
&req->rl_iov);
|
|
kfree(req);
|
|
req = oreq;
|
|
}
|
|
|
|
/* Put back request+reply buffers */
|
|
rpcrdma_buffer_put(req);
|
|
}
|
|
|
|
/*
|
|
* send_request invokes the meat of RPC RDMA. It must do the following:
|
|
* 1. Marshal the RPC request into an RPC RDMA request, which means
|
|
* putting a header in front of data, and creating IOVs for RDMA
|
|
* from those in the request.
|
|
* 2. In marshaling, detect opportunities for RDMA, and use them.
|
|
* 3. Post a recv message to set up asynch completion, then send
|
|
* the request (rpcrdma_ep_post).
|
|
* 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP).
|
|
*/
|
|
|
|
static int
|
|
xprt_rdma_send_request(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *rqst = task->tk_rqstp;
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
|
|
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
|
|
|
|
/* marshal the send itself */
|
|
if (req->rl_niovs == 0 && rpcrdma_marshal_req(rqst) != 0) {
|
|
r_xprt->rx_stats.failed_marshal_count++;
|
|
dprintk("RPC: %s: rpcrdma_marshal_req failed\n",
|
|
__func__);
|
|
return -EIO;
|
|
}
|
|
|
|
if (req->rl_reply == NULL) /* e.g. reconnection */
|
|
rpcrdma_recv_buffer_get(req);
|
|
|
|
if (req->rl_reply) {
|
|
req->rl_reply->rr_func = rpcrdma_reply_handler;
|
|
/* this need only be done once, but... */
|
|
req->rl_reply->rr_xprt = xprt;
|
|
}
|
|
|
|
/* Must suppress retransmit to maintain credits */
|
|
if (req->rl_connect_cookie == xprt->connect_cookie)
|
|
goto drop_connection;
|
|
req->rl_connect_cookie = xprt->connect_cookie;
|
|
|
|
if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
|
|
goto drop_connection;
|
|
|
|
rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
|
|
rqst->rq_bytes_sent = 0;
|
|
return 0;
|
|
|
|
drop_connection:
|
|
xprt_disconnect_done(xprt);
|
|
return -ENOTCONN; /* implies disconnect */
|
|
}
|
|
|
|
static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
|
|
{
|
|
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
|
|
long idle_time = 0;
|
|
|
|
if (xprt_connected(xprt))
|
|
idle_time = (long)(jiffies - xprt->last_used) / HZ;
|
|
|
|
seq_printf(seq,
|
|
"\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu "
|
|
"%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n",
|
|
|
|
0, /* need a local port? */
|
|
xprt->stat.bind_count,
|
|
xprt->stat.connect_count,
|
|
xprt->stat.connect_time,
|
|
idle_time,
|
|
xprt->stat.sends,
|
|
xprt->stat.recvs,
|
|
xprt->stat.bad_xids,
|
|
xprt->stat.req_u,
|
|
xprt->stat.bklog_u,
|
|
|
|
r_xprt->rx_stats.read_chunk_count,
|
|
r_xprt->rx_stats.write_chunk_count,
|
|
r_xprt->rx_stats.reply_chunk_count,
|
|
r_xprt->rx_stats.total_rdma_request,
|
|
r_xprt->rx_stats.total_rdma_reply,
|
|
r_xprt->rx_stats.pullup_copy_count,
|
|
r_xprt->rx_stats.fixup_copy_count,
|
|
r_xprt->rx_stats.hardway_register_count,
|
|
r_xprt->rx_stats.failed_marshal_count,
|
|
r_xprt->rx_stats.bad_reply_count);
|
|
}
|
|
|
|
/*
|
|
* Plumbing for rpc transport switch and kernel module
|
|
*/
|
|
|
|
static struct rpc_xprt_ops xprt_rdma_procs = {
|
|
.reserve_xprt = xprt_rdma_reserve_xprt,
|
|
.release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
|
|
.release_request = xprt_release_rqst_cong, /* ditto */
|
|
.set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
|
|
.rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
|
|
.set_port = xprt_rdma_set_port,
|
|
.connect = xprt_rdma_connect,
|
|
.buf_alloc = xprt_rdma_allocate,
|
|
.buf_free = xprt_rdma_free,
|
|
.send_request = xprt_rdma_send_request,
|
|
.close = xprt_rdma_close,
|
|
.destroy = xprt_rdma_destroy,
|
|
.print_stats = xprt_rdma_print_stats
|
|
};
|
|
|
|
static struct xprt_class xprt_rdma = {
|
|
.list = LIST_HEAD_INIT(xprt_rdma.list),
|
|
.name = "rdma",
|
|
.owner = THIS_MODULE,
|
|
.ident = XPRT_TRANSPORT_RDMA,
|
|
.setup = xprt_setup_rdma,
|
|
};
|
|
|
|
static void __exit xprt_rdma_cleanup(void)
|
|
{
|
|
int rc;
|
|
|
|
dprintk(KERN_INFO "RPCRDMA Module Removed, deregister RPC RDMA transport\n");
|
|
#ifdef RPC_DEBUG
|
|
if (sunrpc_table_header) {
|
|
unregister_sysctl_table(sunrpc_table_header);
|
|
sunrpc_table_header = NULL;
|
|
}
|
|
#endif
|
|
rc = xprt_unregister_transport(&xprt_rdma);
|
|
if (rc)
|
|
dprintk("RPC: %s: xprt_unregister returned %i\n",
|
|
__func__, rc);
|
|
}
|
|
|
|
static int __init xprt_rdma_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = xprt_register_transport(&xprt_rdma);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
dprintk(KERN_INFO "RPCRDMA Module Init, register RPC RDMA transport\n");
|
|
|
|
dprintk(KERN_INFO "Defaults:\n");
|
|
dprintk(KERN_INFO "\tSlots %d\n"
|
|
"\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
|
|
xprt_rdma_slot_table_entries,
|
|
xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
|
|
dprintk(KERN_INFO "\tPadding %d\n\tMemreg %d\n",
|
|
xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy);
|
|
|
|
#ifdef RPC_DEBUG
|
|
if (!sunrpc_table_header)
|
|
sunrpc_table_header = register_sysctl_table(sunrpc_table);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
module_init(xprt_rdma_init);
|
|
module_exit(xprt_rdma_cleanup);
|