Root/net/rds/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
39DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
40EXPORT_PER_CPU_SYMBOL_GPL(rds_stats);
41
42/* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
43
44static const char *const rds_stat_names[] = {
45    "conn_reset",
46    "recv_drop_bad_checksum",
47    "recv_drop_old_seq",
48    "recv_drop_no_sock",
49    "recv_drop_dead_sock",
50    "recv_deliver_raced",
51    "recv_delivered",
52    "recv_queued",
53    "recv_immediate_retry",
54    "recv_delayed_retry",
55    "recv_ack_required",
56    "recv_rdma_bytes",
57    "recv_ping",
58    "send_queue_empty",
59    "send_queue_full",
60    "send_sem_contention",
61    "send_sem_queue_raced",
62    "send_immediate_retry",
63    "send_delayed_retry",
64    "send_drop_acked",
65    "send_ack_required",
66    "send_queued",
67    "send_rdma",
68    "send_rdma_bytes",
69    "send_pong",
70    "page_remainder_hit",
71    "page_remainder_miss",
72    "copy_to_user",
73    "copy_from_user",
74    "cong_update_queued",
75    "cong_update_received",
76    "cong_send_error",
77    "cong_send_blocked",
78};
79
80void rds_stats_info_copy(struct rds_info_iterator *iter,
81             uint64_t *values, const char *const *names, size_t nr)
82{
83    struct rds_info_counter ctr;
84    size_t i;
85
86    for (i = 0; i < nr; i++) {
87        BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
88        strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
89        ctr.value = values[i];
90
91        rds_info_copy(iter, &ctr, sizeof(ctr));
92    }
93}
94EXPORT_SYMBOL_GPL(rds_stats_info_copy);
95
96/*
97 * This gives global counters across all the transports. The strings
98 * are copied in so that the tool doesn't need knowledge of the specific
99 * stats that we're exporting. Some are pretty implementation dependent
100 * and may change over time. That doesn't stop them from being useful.
101 *
102 * This is the only function in the chain that knows about the byte granular
103 * length in userspace. It converts it to number of stat entries that the
104 * rest of the functions operate in.
105 */
106static void rds_stats_info(struct socket *sock, unsigned int len,
107               struct rds_info_iterator *iter,
108               struct rds_info_lengths *lens)
109{
110    struct rds_statistics stats = {0, };
111    uint64_t *src;
112    uint64_t *sum;
113    size_t i;
114    int cpu;
115    unsigned int avail;
116
117    avail = len / sizeof(struct rds_info_counter);
118
119    if (avail < ARRAY_SIZE(rds_stat_names)) {
120        avail = 0;
121        goto trans;
122    }
123
124    for_each_online_cpu(cpu) {
125        src = (uint64_t *)&(per_cpu(rds_stats, cpu));
126        sum = (uint64_t *)&stats;
127        for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
128            *(sum++) += *(src++);
129    }
130
131    rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
132                ARRAY_SIZE(rds_stat_names));
133    avail -= ARRAY_SIZE(rds_stat_names);
134
135trans:
136    lens->each = sizeof(struct rds_info_counter);
137    lens->nr = rds_trans_stats_info_copy(iter, avail) +
138           ARRAY_SIZE(rds_stat_names);
139}
140
141void rds_stats_exit(void)
142{
143    rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
144}
145
146int __init rds_stats_init(void)
147{
148    rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
149    return 0;
150}
151

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