Root/net/rds/tcp_stats.c

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}
75

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