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810 lines
22 KiB
810 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause |
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/* |
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* Copyright (c) 2014-2017 Oracle. All rights reserved. |
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* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the BSD-type |
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* license below: |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* Neither the name of the Network Appliance, Inc. nor the names of |
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* its contributors may be used to endorse or promote products |
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* derived from this software without specific prior written |
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* permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/* |
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* 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/smp.h> |
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#include <linux/sunrpc/addr.h> |
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#include <linux/sunrpc/svc_rdma.h> |
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#include "xprt_rdma.h" |
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#include <trace/events/rpcrdma.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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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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static struct xprt_class xprt_rdma; |
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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 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 = SYSCTL_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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/** |
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* xprt_rdma_connect_worker - establish connection in the background |
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* @work: worker thread context |
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* |
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* Requester holds the xprt's send lock to prevent activity on this |
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* transport while a fresh connection is being established. RPC tasks |
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* sleep on the xprt's pending queue waiting for connect to complete. |
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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; |
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rc = rpcrdma_xprt_connect(r_xprt); |
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xprt_clear_connecting(xprt); |
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if (!rc) { |
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xprt->connect_cookie++; |
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xprt->stat.connect_count++; |
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xprt->stat.connect_time += (long)jiffies - |
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xprt->stat.connect_start; |
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xprt_set_connected(xprt); |
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rc = -EAGAIN; |
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} else |
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rpcrdma_xprt_disconnect(r_xprt); |
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xprt_unlock_connect(xprt, r_xprt); |
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xprt_wake_pending_tasks(xprt, rc); |
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} |
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/** |
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* xprt_rdma_inject_disconnect - inject a connection fault |
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* @xprt: transport context |
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* |
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* If @xprt is connected, disconnect it to simulate spurious |
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* connection loss. Caller must hold @xprt's send lock to |
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* ensure that data structures and hardware resources are |
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* stable during the rdma_disconnect() call. |
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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 = rpcx_to_rdmax(xprt); |
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trace_xprtrdma_op_inject_dsc(r_xprt); |
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rdma_disconnect(r_xprt->rx_ep->re_id); |
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} |
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/** |
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* xprt_rdma_destroy - Full tear down of transport |
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* @xprt: doomed transport context |
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* |
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* Caller guarantees there will be no more calls to us with |
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* this @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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cancel_delayed_work_sync(&r_xprt->rx_connect_worker); |
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rpcrdma_xprt_disconnect(r_xprt); |
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rpcrdma_buffer_destroy(&r_xprt->rx_buf); |
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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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/* 60 second timeout, no retries */ |
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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 rpc_xprt *xprt; |
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struct rpcrdma_xprt *new_xprt; |
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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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return ERR_PTR(-EBADF); |
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if (!try_module_get(THIS_MODULE)) |
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return ERR_PTR(-EIO); |
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xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, |
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xprt_rdma_slot_table_entries); |
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if (!xprt) { |
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module_put(THIS_MODULE); |
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return ERR_PTR(-ENOMEM); |
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} |
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xprt->timeout = &xprt_rdma_default_timeout; |
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xprt->connect_timeout = xprt->timeout->to_initval; |
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xprt->max_reconnect_timeout = xprt->timeout->to_maxval; |
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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->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->xprt_class = &xprt_rdma; |
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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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new_xprt = rpcx_to_rdmax(xprt); |
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rc = rpcrdma_buffer_create(new_xprt); |
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if (rc) { |
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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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return ERR_PTR(rc); |
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} |
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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 = RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT; |
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return xprt; |
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} |
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/** |
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* xprt_rdma_close - close a transport connection |
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* @xprt: transport context |
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* |
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* Called during autoclose or device removal. |
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* |
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* Caller holds @xprt's send lock to prevent activity on this |
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* transport while the connection is torn down. |
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*/ |
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void 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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rpcrdma_xprt_disconnect(r_xprt); |
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xprt->reestablish_timeout = 0; |
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++xprt->connect_cookie; |
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xprt_disconnect_done(xprt); |
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} |
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/** |
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* xprt_rdma_set_port - update server port with rpcbind result |
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* @xprt: controlling RPC transport |
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* @port: new port value |
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* |
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* Transport connect status is unchanged. |
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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 *sap = (struct sockaddr *)&xprt->addr; |
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char buf[8]; |
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rpc_set_port(sap, port); |
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kfree(xprt->address_strings[RPC_DISPLAY_PORT]); |
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snprintf(buf, sizeof(buf), "%u", port); |
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xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
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kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
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snprintf(buf, sizeof(buf), "%4hx", port); |
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xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
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} |
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/** |
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* xprt_rdma_timer - invoked when an RPC times out |
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* @xprt: controlling RPC transport |
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* @task: RPC task that timed out |
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* |
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* Invoked when the transport is still connected, but an RPC |
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* retransmit timeout occurs. |
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* |
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* Since RDMA connections don't have a keep-alive, forcibly |
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* disconnect and retry to connect. This drives full |
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* detection of the network path, and retransmissions of |
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* all pending RPCs. |
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*/ |
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static void |
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xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task) |
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{ |
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xprt_force_disconnect(xprt); |
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} |
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/** |
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* xprt_rdma_set_connect_timeout - set timeouts for establishing a connection |
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* @xprt: controlling transport instance |
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* @connect_timeout: reconnect timeout after client disconnects |
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* @reconnect_timeout: reconnect timeout after server disconnects |
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* |
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*/ |
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static void xprt_rdma_set_connect_timeout(struct rpc_xprt *xprt, |
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unsigned long connect_timeout, |
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unsigned long reconnect_timeout) |
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{ |
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struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
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trace_xprtrdma_op_set_cto(r_xprt, connect_timeout, reconnect_timeout); |
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spin_lock(&xprt->transport_lock); |
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if (connect_timeout < xprt->connect_timeout) { |
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struct rpc_timeout to; |
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unsigned long initval; |
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to = *xprt->timeout; |
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initval = connect_timeout; |
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if (initval < RPCRDMA_INIT_REEST_TO << 1) |
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initval = RPCRDMA_INIT_REEST_TO << 1; |
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to.to_initval = initval; |
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to.to_maxval = initval; |
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r_xprt->rx_timeout = to; |
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xprt->timeout = &r_xprt->rx_timeout; |
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xprt->connect_timeout = connect_timeout; |
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} |
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if (reconnect_timeout < xprt->max_reconnect_timeout) |
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xprt->max_reconnect_timeout = reconnect_timeout; |
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spin_unlock(&xprt->transport_lock); |
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} |
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/** |
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* xprt_rdma_connect - schedule an attempt to reconnect |
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* @xprt: transport state |
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* @task: RPC scheduler context (unused) |
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* |
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*/ |
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static void |
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xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
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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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unsigned long delay; |
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WARN_ON_ONCE(!xprt_lock_connect(xprt, task, r_xprt)); |
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delay = 0; |
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if (ep && ep->re_connect_status != 0) { |
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delay = xprt_reconnect_delay(xprt); |
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xprt_reconnect_backoff(xprt, RPCRDMA_INIT_REEST_TO); |
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} |
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trace_xprtrdma_op_connect(r_xprt, delay); |
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queue_delayed_work(xprtiod_workqueue, &r_xprt->rx_connect_worker, |
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delay); |
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} |
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/** |
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* xprt_rdma_alloc_slot - allocate an rpc_rqst |
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* @xprt: controlling RPC transport |
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* @task: RPC task requesting a fresh rpc_rqst |
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* |
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* tk_status values: |
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* %0 if task->tk_rqstp points to a fresh rpc_rqst |
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* %-EAGAIN if no rpc_rqst is available; queued on backlog |
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*/ |
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static void |
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xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) |
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{ |
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struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
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struct rpcrdma_req *req; |
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req = rpcrdma_buffer_get(&r_xprt->rx_buf); |
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if (!req) |
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goto out_sleep; |
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task->tk_rqstp = &req->rl_slot; |
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task->tk_status = 0; |
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return; |
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out_sleep: |
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task->tk_status = -EAGAIN; |
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xprt_add_backlog(xprt, task); |
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} |
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/** |
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* xprt_rdma_free_slot - release an rpc_rqst |
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* @xprt: controlling RPC transport |
|
* @rqst: rpc_rqst to release |
|
* |
|
*/ |
|
static void |
|
xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst) |
|
{ |
|
struct rpcrdma_xprt *r_xprt = |
|
container_of(xprt, struct rpcrdma_xprt, rx_xprt); |
|
|
|
rpcrdma_reply_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); |
|
if (!xprt_wake_up_backlog(xprt, rqst)) { |
|
memset(rqst, 0, sizeof(*rqst)); |
|
rpcrdma_buffer_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); |
|
} |
|
} |
|
|
|
static bool rpcrdma_check_regbuf(struct rpcrdma_xprt *r_xprt, |
|
struct rpcrdma_regbuf *rb, size_t size, |
|
gfp_t flags) |
|
{ |
|
if (unlikely(rdmab_length(rb) < size)) { |
|
if (!rpcrdma_regbuf_realloc(rb, size, flags)) |
|
return false; |
|
r_xprt->rx_stats.hardway_register_count += size; |
|
} |
|
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 |
|
*/ |
|
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 = rpcr_to_rdmar(rqst); |
|
gfp_t flags; |
|
|
|
flags = RPCRDMA_DEF_GFP; |
|
if (RPC_IS_SWAPPER(task)) |
|
flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; |
|
|
|
if (!rpcrdma_check_regbuf(r_xprt, req->rl_sendbuf, rqst->rq_callsize, |
|
flags)) |
|
goto out_fail; |
|
if (!rpcrdma_check_regbuf(r_xprt, req->rl_recvbuf, rqst->rq_rcvsize, |
|
flags)) |
|
goto out_fail; |
|
|
|
rqst->rq_buffer = rdmab_data(req->rl_sendbuf); |
|
rqst->rq_rbuffer = rdmab_data(req->rl_recvbuf); |
|
return 0; |
|
|
|
out_fail: |
|
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_req *req = rpcr_to_rdmar(rqst); |
|
|
|
if (unlikely(!list_empty(&req->rl_registered))) { |
|
trace_xprtrdma_mrs_zap(task); |
|
frwr_unmap_sync(rpcx_to_rdmax(rqst->rq_xprt), req); |
|
} |
|
|
|
/* XXX: If the RPC is completing because of a signal and |
|
* not because a reply was received, we ought to ensure |
|
* that the Send completion has fired, so that memory |
|
* involved with the Send is not still visible to the NIC. |
|
*/ |
|
} |
|
|
|
/** |
|
* xprt_rdma_send_request - marshal and send an RPC request |
|
* @rqst: 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 |
|
* %-EMSGSIZE if encoding ran out of buffer space. The request |
|
* was not sent. Do not try to send this message again. |
|
* %-EIO if an I/O error occurred. The request was not sent. |
|
* Do not try to send this message again. |
|
*/ |
|
static int |
|
xprt_rdma_send_request(struct rpc_rqst *rqst) |
|
{ |
|
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)) |
|
return -ENOTCONN; |
|
|
|
if (!xprt_request_get_cong(xprt, rqst)) |
|
return -EBADSLT; |
|
|
|
rc = rpcrdma_marshal_req(r_xprt, rqst); |
|
if (rc < 0) |
|
goto failed_marshal; |
|
|
|
/* Must suppress retransmit to maintain credits */ |
|
if (rqst->rq_connect_cookie == xprt->connect_cookie) |
|
goto drop_connection; |
|
rqst->rq_xtime = ktime_get(); |
|
|
|
if (frwr_send(r_xprt, req)) |
|
goto drop_connection; |
|
|
|
rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; |
|
|
|
/* An RPC with no reply will throw off credit accounting, |
|
* so drop the connection to reset the credit grant. |
|
*/ |
|
if (!rpc_reply_expected(rqst->rq_task)) |
|
goto drop_connection; |
|
return 0; |
|
|
|
failed_marshal: |
|
if (rc != -ENOTCONN) |
|
return rc; |
|
drop_connection: |
|
xprt_rdma_close(xprt); |
|
return -ENOTCONN; |
|
} |
|
|
|
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 / HZ, |
|
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_recycled, |
|
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_rdma_alloc_slot, |
|
.free_slot = xprt_rdma_free_slot, |
|
.release_request = xprt_release_rqst_cong, /* ditto */ |
|
.wait_for_reply_request = xprt_wait_for_reply_request_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, |
|
.set_connect_timeout = xprt_rdma_set_connect_timeout, |
|
.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_maxpayload = xprt_rdma_bc_maxpayload, |
|
.bc_num_slots = xprt_rdma_bc_max_slots, |
|
.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, |
|
.netid = { "rdma", "rdma6", "" }, |
|
}; |
|
|
|
void xprt_rdma_cleanup(void) |
|
{ |
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
|
if (sunrpc_table_header) { |
|
unregister_sysctl_table(sunrpc_table_header); |
|
sunrpc_table_header = NULL; |
|
} |
|
#endif |
|
|
|
xprt_unregister_transport(&xprt_rdma); |
|
xprt_unregister_transport(&xprt_rdma_bc); |
|
} |
|
|
|
int xprt_rdma_init(void) |
|
{ |
|
int rc; |
|
|
|
rc = xprt_register_transport(&xprt_rdma); |
|
if (rc) |
|
return rc; |
|
|
|
rc = xprt_register_transport(&xprt_rdma_bc); |
|
if (rc) { |
|
xprt_unregister_transport(&xprt_rdma); |
|
return rc; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
|
if (!sunrpc_table_header) |
|
sunrpc_table_header = register_sysctl_table(sunrpc_table); |
|
#endif |
|
return 0; |
|
}
|
|
|