![Chuck Lever](/assets/img/avatar_default.png)
Some RPC transports have more overhead in their send_request callouts than others. For example, for RPC-over-RDMA: - Marshaling an RPC often has to DMA map the RPC arguments - Registration methods perform memory registration as part of marshaling To capture just server and network latencies more precisely: when sending a Call, capture the rq_xtime timestamp _after_ the transport header has been marshaled. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
875 lines
24 KiB
C
875 lines
24 KiB
C
/*
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* Copyright (c) 2014-2017 Oracle. All rights reserved.
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* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* 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/slab.h>
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#include <linux/seq_file.h>
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#include <linux/sunrpc/addr.h>
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#include "xprt_rdma.h"
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_TRANS
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#endif
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/*
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* 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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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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unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRWR;
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int xprt_rdma_pad_optimize;
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#if IS_ENABLED(CONFIG_SUNRPC_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 min_inline_size = RPCRDMA_MIN_INLINE;
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static unsigned int max_inline_size = RPCRDMA_MAX_INLINE;
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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 unsigned int dummy;
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static struct ctl_table_header *sunrpc_table_header;
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static struct 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_minmax,
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.extra1 = &min_inline_size,
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.extra2 = &max_inline_size,
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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_minmax,
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.extra1 = &min_inline_size,
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.extra2 = &max_inline_size,
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},
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{
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.procname = "rdma_inline_write_padding",
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.data = &dummy,
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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 struct 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 const struct rpc_xprt_ops xprt_rdma_procs;
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static void
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xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap)
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{
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struct sockaddr_in *sin = (struct sockaddr_in *)sap;
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char buf[20];
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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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xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA;
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}
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static void
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xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap)
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
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char buf[40];
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snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
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xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
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xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6;
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}
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void
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xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap)
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{
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char buf[128];
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switch (sap->sa_family) {
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case AF_INET:
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xprt_rdma_format_addresses4(xprt, sap);
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break;
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case AF_INET6:
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xprt_rdma_format_addresses6(xprt, sap);
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break;
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default:
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pr_err("rpcrdma: Unrecognized address family\n");
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return;
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}
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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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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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xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
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}
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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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void
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rpcrdma_conn_func(struct rpcrdma_ep *ep)
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{
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schedule_delayed_work(&ep->rep_connect_worker, 0);
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}
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void
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rpcrdma_connect_worker(struct work_struct *work)
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{
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struct rpcrdma_ep *ep =
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container_of(work, struct rpcrdma_ep, rep_connect_worker.work);
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struct rpcrdma_xprt *r_xprt =
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container_of(ep, struct rpcrdma_xprt, rx_ep);
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struct rpc_xprt *xprt = &r_xprt->rx_xprt;
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spin_lock_bh(&xprt->transport_lock);
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if (ep->rep_connected > 0) {
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if (!xprt_test_and_set_connected(xprt))
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xprt_wake_pending_tasks(xprt, 0);
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} else {
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if (xprt_test_and_clear_connected(xprt))
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xprt_wake_pending_tasks(xprt, -ENOTCONN);
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}
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spin_unlock_bh(&xprt->transport_lock);
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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 = container_of(work, struct rpcrdma_xprt,
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rx_connect_worker.work);
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struct rpc_xprt *xprt = &r_xprt->rx_xprt;
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int rc = 0;
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xprt_clear_connected(xprt);
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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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xprt_wake_pending_tasks(xprt, rc);
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xprt_clear_connecting(xprt);
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}
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static void
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xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
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{
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struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt,
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rx_xprt);
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trace_xprtrdma_inject_dsc(r_xprt);
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rdma_disconnect(r_xprt->rx_ia.ri_id);
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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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trace_xprtrdma_destroy(r_xprt);
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cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
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xprt_clear_connected(xprt);
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rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
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rpcrdma_buffer_destroy(&r_xprt->rx_buf);
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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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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 *sap;
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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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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 = RPCRDMA_BIND_TO;
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xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
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xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
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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->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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sap = args->dstaddr;
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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, sap, xprt->addrlen);
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if (rpc_get_port(sap))
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xprt_set_bound(xprt);
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xprt_rdma_format_addresses(xprt, sap);
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cdata.max_requests = xprt->max_reqs;
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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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/*
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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);
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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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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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rc = rpcrdma_buffer_create(new_xprt);
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if (rc)
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goto out3;
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INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
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xprt_rdma_connect_worker);
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xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
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if (xprt->max_payload == 0)
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goto out4;
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xprt->max_payload <<= PAGE_SHIFT;
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dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
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__func__, xprt->max_payload);
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if (!try_module_get(THIS_MODULE))
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goto out4;
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dprintk("RPC: %s: %s:%s\n", __func__,
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xprt->address_strings[RPC_DISPLAY_ADDR],
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xprt->address_strings[RPC_DISPLAY_PORT]);
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trace_xprtrdma_create(new_xprt);
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return xprt;
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out4:
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rpcrdma_buffer_destroy(&new_xprt->rx_buf);
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rc = -ENODEV;
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out3:
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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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trace_xprtrdma_destroy(new_xprt);
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xprt_rdma_free_addresses(xprt);
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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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* xprt_rdma_close - Close down RDMA connection
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* @xprt: generic transport to be closed
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*
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* Called during transport shutdown reconnect, or device
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* removal. Caller holds the transport's write lock.
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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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struct rpcrdma_ep *ep = &r_xprt->rx_ep;
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struct rpcrdma_ia *ia = &r_xprt->rx_ia;
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dprintk("RPC: %s: closing xprt %p\n", __func__, xprt);
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if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) {
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xprt_clear_connected(xprt);
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rpcrdma_ia_remove(ia);
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return;
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}
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if (ep->rep_connected == -ENODEV)
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return;
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if (ep->rep_connected > 0)
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xprt->reestablish_timeout = 0;
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xprt_disconnect_done(xprt);
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rpcrdma_ep_disconnect(ep, ia);
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|
}
|
|
|
|
/**
|
|
* xprt_rdma_set_port - update server port with rpcbind result
|
|
* @xprt: controlling RPC transport
|
|
* @port: new port value
|
|
*
|
|
* Transport connect status is unchanged.
|
|
*/
|
|
static void
|
|
xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
|
|
{
|
|
struct sockaddr *sap = (struct sockaddr *)&xprt->addr;
|
|
char buf[8];
|
|
|
|
dprintk("RPC: %s: setting port for xprt %p (%s:%s) to %u\n",
|
|
__func__, xprt,
|
|
xprt->address_strings[RPC_DISPLAY_ADDR],
|
|
xprt->address_strings[RPC_DISPLAY_PORT],
|
|
port);
|
|
|
|
rpc_set_port(sap, port);
|
|
|
|
kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
|
|
snprintf(buf, sizeof(buf), "%u", port);
|
|
xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
|
|
|
|
kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
|
|
snprintf(buf, sizeof(buf), "%4hx", port);
|
|
xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
|
|
}
|
|
|
|
/**
|
|
* xprt_rdma_timer - invoked when an RPC times out
|
|
* @xprt: controlling RPC transport
|
|
* @task: RPC task that timed out
|
|
*
|
|
* Invoked when the transport is still connected, but an RPC
|
|
* retransmit timeout occurs.
|
|
*
|
|
* Since RDMA connections don't have a keep-alive, forcibly
|
|
* disconnect and retry to connect. This drives full
|
|
* detection of the network path, and retransmissions of
|
|
* all pending RPCs.
|
|
*/
|
|
static void
|
|
xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task)
|
|
{
|
|
xprt_force_disconnect(xprt);
|
|
}
|
|
|
|
static void
|
|
xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
|
|
{
|
|
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
|
|
|
|
if (r_xprt->rx_ep.rep_connected != 0) {
|
|
/* Reconnect */
|
|
schedule_delayed_work(&r_xprt->rx_connect_worker,
|
|
xprt->reestablish_timeout);
|
|
xprt->reestablish_timeout <<= 1;
|
|
if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
|
|
xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
|
|
else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
|
|
xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
|
|
} else {
|
|
schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
|
|
if (!RPC_IS_ASYNC(task))
|
|
flush_delayed_work(&r_xprt->rx_connect_worker);
|
|
}
|
|
}
|
|
|
|
static bool
|
|
rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
|
|
size_t size, gfp_t flags)
|
|
{
|
|
struct rpcrdma_regbuf *rb;
|
|
|
|
if (req->rl_sendbuf && rdmab_length(req->rl_sendbuf) >= size)
|
|
return true;
|
|
|
|
rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags);
|
|
if (IS_ERR(rb))
|
|
return false;
|
|
|
|
rpcrdma_free_regbuf(req->rl_sendbuf);
|
|
r_xprt->rx_stats.hardway_register_count += size;
|
|
req->rl_sendbuf = rb;
|
|
return true;
|
|
}
|
|
|
|
/* The rq_rcv_buf is used only if a Reply chunk is necessary.
|
|
* The decision to use a Reply chunk is made later in
|
|
* rpcrdma_marshal_req. This buffer is registered at that time.
|
|
*
|
|
* Otherwise, the associated RPC Reply arrives in a separate
|
|
* Receive buffer, arbitrarily chosen by the HCA. The buffer
|
|
* allocated here for the RPC Reply is not utilized in that
|
|
* case. See rpcrdma_inline_fixup.
|
|
*
|
|
* A regbuf is used here to remember the buffer size.
|
|
*/
|
|
static bool
|
|
rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
|
|
size_t size, gfp_t flags)
|
|
{
|
|
struct rpcrdma_regbuf *rb;
|
|
|
|
if (req->rl_recvbuf && rdmab_length(req->rl_recvbuf) >= size)
|
|
return true;
|
|
|
|
rb = rpcrdma_alloc_regbuf(size, DMA_NONE, flags);
|
|
if (IS_ERR(rb))
|
|
return false;
|
|
|
|
rpcrdma_free_regbuf(req->rl_recvbuf);
|
|
r_xprt->rx_stats.hardway_register_count += size;
|
|
req->rl_recvbuf = rb;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* xprt_rdma_allocate - allocate transport resources for an RPC
|
|
* @task: RPC task
|
|
*
|
|
* Return values:
|
|
* 0: Success; rq_buffer points to RPC buffer to use
|
|
* ENOMEM: Out of memory, call again later
|
|
* EIO: A permanent error occurred, do not retry
|
|
*
|
|
* 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.
|
|
*
|
|
* xprt_rdma_allocate provides buffers that are already mapped for
|
|
* DMA, and a local DMA lkey is provided for each.
|
|
*/
|
|
static int
|
|
xprt_rdma_allocate(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *rqst = task->tk_rqstp;
|
|
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
|
|
struct rpcrdma_req *req;
|
|
gfp_t flags;
|
|
|
|
req = rpcrdma_buffer_get(&r_xprt->rx_buf);
|
|
if (req == NULL)
|
|
goto out_get;
|
|
|
|
flags = RPCRDMA_DEF_GFP;
|
|
if (RPC_IS_SWAPPER(task))
|
|
flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
|
|
|
|
if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags))
|
|
goto out_fail;
|
|
if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags))
|
|
goto out_fail;
|
|
|
|
rpcrdma_set_xprtdata(rqst, req);
|
|
rqst->rq_buffer = req->rl_sendbuf->rg_base;
|
|
rqst->rq_rbuffer = req->rl_recvbuf->rg_base;
|
|
trace_xprtrdma_allocate(task, req);
|
|
return 0;
|
|
|
|
out_fail:
|
|
rpcrdma_buffer_put(req);
|
|
out_get:
|
|
trace_xprtrdma_allocate(task, NULL);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* xprt_rdma_free - release resources allocated by xprt_rdma_allocate
|
|
* @task: RPC task
|
|
*
|
|
* Caller guarantees rqst->rq_buffer is non-NULL.
|
|
*/
|
|
static void
|
|
xprt_rdma_free(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *rqst = task->tk_rqstp;
|
|
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
|
|
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
|
|
|
|
if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags))
|
|
rpcrdma_release_rqst(r_xprt, req);
|
|
trace_xprtrdma_rpc_done(task, req);
|
|
rpcrdma_buffer_put(req);
|
|
}
|
|
|
|
/**
|
|
* xprt_rdma_send_request - marshal and send an RPC request
|
|
* @task: RPC task with an RPC message in rq_snd_buf
|
|
*
|
|
* Caller holds the transport's write lock.
|
|
*
|
|
* Returns:
|
|
* %0 if the RPC message has been sent
|
|
* %-ENOTCONN if the caller should reconnect and call again
|
|
* %-EAGAIN if the caller should call again
|
|
* %-ENOBUFS if the caller should call again after a delay
|
|
* %-EIO if a permanent error occurred and the request was not
|
|
* sent. Do not try to send this message again.
|
|
*/
|
|
static int
|
|
xprt_rdma_send_request(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *rqst = task->tk_rqstp;
|
|
struct rpc_xprt *xprt = rqst->rq_xprt;
|
|
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
|
|
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
|
|
int rc = 0;
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
if (unlikely(!rqst->rq_buffer))
|
|
return xprt_rdma_bc_send_reply(rqst);
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
|
|
if (!xprt_connected(xprt))
|
|
goto drop_connection;
|
|
|
|
rc = rpcrdma_marshal_req(r_xprt, rqst);
|
|
if (rc < 0)
|
|
goto failed_marshal;
|
|
|
|
if (req->rl_reply == NULL) /* e.g. reconnection */
|
|
rpcrdma_recv_buffer_get(req);
|
|
|
|
/* Must suppress retransmit to maintain credits */
|
|
if (rqst->rq_connect_cookie == xprt->connect_cookie)
|
|
goto drop_connection;
|
|
rqst->rq_xtime = ktime_get();
|
|
|
|
__set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
|
|
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;
|
|
|
|
/* An RPC with no reply will throw off credit accounting,
|
|
* so drop the connection to reset the credit grant.
|
|
*/
|
|
if (!rpc_reply_expected(task))
|
|
goto drop_connection;
|
|
return 0;
|
|
|
|
failed_marshal:
|
|
if (rc != -ENOTCONN)
|
|
return rc;
|
|
drop_connection:
|
|
xprt_disconnect_done(xprt);
|
|
return -ENOTCONN; /* implies disconnect */
|
|
}
|
|
|
|
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_puts(seq, "\txprt:\trdma ");
|
|
seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ",
|
|
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);
|
|
seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
|
|
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,
|
|
r_xprt->rx_stats.nomsg_call_count);
|
|
seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n",
|
|
r_xprt->rx_stats.mrs_recovered,
|
|
r_xprt->rx_stats.mrs_orphaned,
|
|
r_xprt->rx_stats.mrs_allocated,
|
|
r_xprt->rx_stats.local_inv_needed,
|
|
r_xprt->rx_stats.empty_sendctx_q,
|
|
r_xprt->rx_stats.reply_waits_for_send);
|
|
}
|
|
|
|
static int
|
|
xprt_rdma_enable_swap(struct rpc_xprt *xprt)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
xprt_rdma_disable_swap(struct rpc_xprt *xprt)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Plumbing for rpc transport switch and kernel module
|
|
*/
|
|
|
|
static const struct rpc_xprt_ops xprt_rdma_procs = {
|
|
.reserve_xprt = xprt_reserve_xprt_cong,
|
|
.release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
|
|
.alloc_slot = xprt_alloc_slot,
|
|
.release_request = xprt_release_rqst_cong, /* ditto */
|
|
.set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
|
|
.timer = xprt_rdma_timer,
|
|
.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,
|
|
.enable_swap = xprt_rdma_enable_swap,
|
|
.disable_swap = xprt_rdma_disable_swap,
|
|
.inject_disconnect = xprt_rdma_inject_disconnect,
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
.bc_setup = xprt_rdma_bc_setup,
|
|
.bc_up = xprt_rdma_bc_up,
|
|
.bc_maxpayload = xprt_rdma_bc_maxpayload,
|
|
.bc_free_rqst = xprt_rdma_bc_free_rqst,
|
|
.bc_destroy = xprt_rdma_bc_destroy,
|
|
#endif
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
void xprt_rdma_cleanup(void)
|
|
{
|
|
int rc;
|
|
|
|
dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
|
|
#if IS_ENABLED(CONFIG_SUNRPC_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);
|
|
|
|
rpcrdma_destroy_wq();
|
|
|
|
rc = xprt_unregister_transport(&xprt_rdma_bc);
|
|
if (rc)
|
|
dprintk("RPC: %s: xprt_unregister(bc) returned %i\n",
|
|
__func__, rc);
|
|
}
|
|
|
|
int xprt_rdma_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = rpcrdma_alloc_wq();
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = xprt_register_transport(&xprt_rdma);
|
|
if (rc) {
|
|
rpcrdma_destroy_wq();
|
|
return rc;
|
|
}
|
|
|
|
rc = xprt_register_transport(&xprt_rdma_bc);
|
|
if (rc) {
|
|
xprt_unregister_transport(&xprt_rdma);
|
|
rpcrdma_destroy_wq();
|
|
return rc;
|
|
}
|
|
|
|
dprintk("RPCRDMA Module Init, register RPC RDMA transport\n");
|
|
|
|
dprintk("Defaults:\n");
|
|
dprintk("\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("\tPadding 0\n\tMemreg %d\n", xprt_rdma_memreg_strategy);
|
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
if (!sunrpc_table_header)
|
|
sunrpc_table_header = register_sysctl_table(sunrpc_table);
|
|
#endif
|
|
return 0;
|
|
}
|