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
40 DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats)
41 ____cacheline_aligned;
42
43 static 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
rds_tcp_stats_info_copy(struct rds_info_iterator * iter,unsigned int avail)51 unsigned 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));
72 out:
73 return ARRAY_SIZE(rds_tcp_stat_names);
74 }
75