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This code allows RDS to be tunneled over a TCP connection. RDMA operations are disabled when using TCP transport, but this frees RDS from the IB/RDMA stack dependency, and allows it to be used with standard Ethernet adapters, or in a VM. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/*
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* Copyright (c) 2006 Oracle. 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
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* 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
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/percpu.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include "rds.h"
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#include "tcp.h"
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DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats)
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____cacheline_aligned;
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static const char const *rds_tcp_stat_names[] = {
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"tcp_data_ready_calls",
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"tcp_write_space_calls",
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"tcp_sndbuf_full",
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"tcp_connect_raced",
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"tcp_listen_closed_stale",
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};
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unsigned int rds_tcp_stats_info_copy(struct rds_info_iterator *iter,
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unsigned int avail)
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{
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struct rds_tcp_statistics stats = {0, };
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uint64_t *src;
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uint64_t *sum;
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size_t i;
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int cpu;
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if (avail < ARRAY_SIZE(rds_tcp_stat_names))
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goto out;
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for_each_online_cpu(cpu) {
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src = (uint64_t *)&(per_cpu(rds_tcp_stats, cpu));
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sum = (uint64_t *)&stats;
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for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
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*(sum++) += *(src++);
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}
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rds_stats_info_copy(iter, (uint64_t *)&stats, rds_tcp_stat_names,
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ARRAY_SIZE(rds_tcp_stat_names));
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out:
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return ARRAY_SIZE(rds_tcp_stat_names);
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}
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