net: mark read-only arrays as const
[linux-2.6.git] / 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
39 DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
40
41 /* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
42
43 static const char *const rds_stat_names[] = {
44         "conn_reset",
45         "recv_drop_bad_checksum",
46         "recv_drop_old_seq",
47         "recv_drop_no_sock",
48         "recv_drop_dead_sock",
49         "recv_deliver_raced",
50         "recv_delivered",
51         "recv_queued",
52         "recv_immediate_retry",
53         "recv_delayed_retry",
54         "recv_ack_required",
55         "recv_rdma_bytes",
56         "recv_ping",
57         "send_queue_empty",
58         "send_queue_full",
59         "send_sem_contention",
60         "send_sem_queue_raced",
61         "send_immediate_retry",
62         "send_delayed_retry",
63         "send_drop_acked",
64         "send_ack_required",
65         "send_queued",
66         "send_rdma",
67         "send_rdma_bytes",
68         "send_pong",
69         "page_remainder_hit",
70         "page_remainder_miss",
71         "copy_to_user",
72         "copy_from_user",
73         "cong_update_queued",
74         "cong_update_received",
75         "cong_send_error",
76         "cong_send_blocked",
77 };
78
79 void rds_stats_info_copy(struct rds_info_iterator *iter,
80                          uint64_t *values, const char *const *names, size_t nr)
81 {
82         struct rds_info_counter ctr;
83         size_t i;
84
85         for (i = 0; i < nr; i++) {
86                 BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
87                 strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
88                 ctr.value = values[i];
89
90                 rds_info_copy(iter, &ctr, sizeof(ctr));
91         }
92 }
93
94 /*
95  * This gives global counters across all the transports.  The strings
96  * are copied in so that the tool doesn't need knowledge of the specific
97  * stats that we're exporting.  Some are pretty implementation dependent
98  * and may change over time.  That doesn't stop them from being useful.
99  *
100  * This is the only function in the chain that knows about the byte granular
101  * length in userspace.  It converts it to number of stat entries that the
102  * rest of the functions operate in.
103  */
104 static void rds_stats_info(struct socket *sock, unsigned int len,
105                            struct rds_info_iterator *iter,
106                            struct rds_info_lengths *lens)
107 {
108         struct rds_statistics stats = {0, };
109         uint64_t *src;
110         uint64_t *sum;
111         size_t i;
112         int cpu;
113         unsigned int avail;
114
115         avail = len / sizeof(struct rds_info_counter);
116
117         if (avail < ARRAY_SIZE(rds_stat_names)) {
118                 avail = 0;
119                 goto trans;
120         }
121
122         for_each_online_cpu(cpu) {
123                 src = (uint64_t *)&(per_cpu(rds_stats, cpu));
124                 sum = (uint64_t *)&stats;
125                 for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
126                         *(sum++) += *(src++);
127         }
128
129         rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
130                             ARRAY_SIZE(rds_stat_names));
131         avail -= ARRAY_SIZE(rds_stat_names);
132
133 trans:
134         lens->each = sizeof(struct rds_info_counter);
135         lens->nr = rds_trans_stats_info_copy(iter, avail) +
136                    ARRAY_SIZE(rds_stat_names);
137 }
138
139 void rds_stats_exit(void)
140 {
141         rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
142 }
143
144 int __init rds_stats_init(void)
145 {
146         rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
147         return 0;
148 }