tcp_stats.c
2.34 KB
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/*
* 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);
}