diff options
author | Andy Grover <andy.grover@oracle.com> | 2009-08-21 16:28:31 +0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-08-24 06:13:02 +0400 |
commit | 70041088e3b976627ba9a183b812f39ef8a9ba0e (patch) | |
tree | bad7b11763d7b02b185bd705fe5ed292397cbc7a /net/rds/tcp_stats.c | |
parent | 7d6fd5e7e97a2188d56441e4e96494c21c5994a7 (diff) |
RDS: Add TCP transport to RDS
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>
Diffstat (limited to 'net/rds/tcp_stats.c')
-rw-r--r-- | net/rds/tcp_stats.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/net/rds/tcp_stats.c b/net/rds/tcp_stats.c new file mode 100644 index 000000000000..d5898d03cd68 --- /dev/null +++ b/net/rds/tcp_stats.c @@ -0,0 +1,74 @@ +/* + * Copyright (c) 2006 Oracle. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + */ +#include <linux/percpu.h> +#include <linux/seq_file.h> +#include <linux/proc_fs.h> + +#include "rds.h" +#include "tcp.h" + +DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats) + ____cacheline_aligned; + +static const char const *rds_tcp_stat_names[] = { + "tcp_data_ready_calls", + "tcp_write_space_calls", + "tcp_sndbuf_full", + "tcp_connect_raced", + "tcp_listen_closed_stale", +}; + +unsigned int rds_tcp_stats_info_copy(struct rds_info_iterator *iter, + unsigned int avail) +{ + struct rds_tcp_statistics stats = {0, }; + uint64_t *src; + uint64_t *sum; + size_t i; + int cpu; + + if (avail < ARRAY_SIZE(rds_tcp_stat_names)) + goto out; + + for_each_online_cpu(cpu) { + src = (uint64_t *)&(per_cpu(rds_tcp_stats, cpu)); + sum = (uint64_t *)&stats; + for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++) + *(sum++) += *(src++); + } + + rds_stats_info_copy(iter, (uint64_t *)&stats, rds_tcp_stat_names, + ARRAY_SIZE(rds_tcp_stat_names)); +out: + return ARRAY_SIZE(rds_tcp_stat_names); +} |