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/net/rds/tcp_stats.c

http://github.com/mirrors/linux
C | 74 lines | 35 code | 7 blank | 32 comment | 2 complexity | 2151bf168f504bf9dfca6013a3122103 MD5 | raw file
 1/*
 2 * Copyright (c) 2006 Oracle.  All rights reserved.
 3 *
 4 * This software is available to you under a choice of one of two
 5 * licenses.  You may choose to be licensed under the terms of the GNU
 6 * General Public License (GPL) Version 2, available from the file
 7 * COPYING in the main directory of this source tree, or the
 8 * OpenIB.org BSD license below:
 9 *
10 *     Redistribution and use in source and binary forms, with or
11 *     without modification, are permitted provided that the following
12 *     conditions are met:
13 *
14 *      - Redistributions of source code must retain the above
15 *        copyright notice, this list of conditions and the following
16 *        disclaimer.
17 *
18 *      - Redistributions in binary form must reproduce the above
19 *        copyright notice, this list of conditions and the following
20 *        disclaimer in the documentation and/or other materials
21 *        provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/percpu.h>
34#include <linux/seq_file.h>
35#include <linux/proc_fs.h>
36
37#include "rds.h"
38#include "tcp.h"
39
40DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats)
41	____cacheline_aligned;
42
43static const char * const rds_tcp_stat_names[] = {
44	"tcp_data_ready_calls",
45	"tcp_write_space_calls",
46	"tcp_sndbuf_full",
47	"tcp_connect_raced",
48	"tcp_listen_closed_stale",
49};
50
51unsigned int rds_tcp_stats_info_copy(struct rds_info_iterator *iter,
52				     unsigned int avail)
53{
54	struct rds_tcp_statistics stats = {0, };
55	uint64_t *src;
56	uint64_t *sum;
57	size_t i;
58	int cpu;
59
60	if (avail < ARRAY_SIZE(rds_tcp_stat_names))
61		goto out;
62
63	for_each_online_cpu(cpu) {
64		src = (uint64_t *)&(per_cpu(rds_tcp_stats, cpu));
65		sum = (uint64_t *)&stats;
66		for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
67			*(sum++) += *(src++);
68	}
69
70	rds_stats_info_copy(iter, (uint64_t *)&stats, rds_tcp_stat_names,
71			    ARRAY_SIZE(rds_tcp_stat_names));
72out:
73	return ARRAY_SIZE(rds_tcp_stat_names);
74}