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 #include <linux/export.h>
37
38 #include "rds.h"
39
40 DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
41 EXPORT_PER_CPU_SYMBOL_GPL(rds_stats);
42
43 /* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
44
45 static const char *const rds_stat_names[] = {
46 "conn_reset",
47 "recv_drop_bad_checksum",
48 "recv_drop_old_seq",
49 "recv_drop_no_sock",
50 "recv_drop_dead_sock",
51 "recv_deliver_raced",
52 "recv_delivered",
53 "recv_queued",
54 "recv_immediate_retry",
55 "recv_delayed_retry",
56 "recv_ack_required",
57 "recv_rdma_bytes",
58 "recv_ping",
59 "send_queue_empty",
60 "send_queue_full",
61 "send_lock_contention",
62 "send_lock_queue_raced",
63 "send_immediate_retry",
64 "send_delayed_retry",
65 "send_drop_acked",
66 "send_ack_required",
67 "send_queued",
68 "send_rdma",
69 "send_rdma_bytes",
70 "send_pong",
71 "page_remainder_hit",
72 "page_remainder_miss",
73 "copy_to_user",
74 "copy_from_user",
75 "cong_update_queued",
76 "cong_update_received",
77 "cong_send_error",
78 "cong_send_blocked",
79 };
80
rds_stats_info_copy(struct rds_info_iterator * iter,uint64_t * values,const char * const * names,size_t nr)81 void rds_stats_info_copy(struct rds_info_iterator *iter,
82 uint64_t *values, const char *const *names, size_t nr)
83 {
84 struct rds_info_counter ctr;
85 size_t i;
86
87 for (i = 0; i < nr; i++) {
88 BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
89 strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
90 ctr.name[sizeof(ctr.name) - 1] = '\0';
91 ctr.value = values[i];
92
93 rds_info_copy(iter, &ctr, sizeof(ctr));
94 }
95 }
96 EXPORT_SYMBOL_GPL(rds_stats_info_copy);
97
98 /*
99 * This gives global counters across all the transports. The strings
100 * are copied in so that the tool doesn't need knowledge of the specific
101 * stats that we're exporting. Some are pretty implementation dependent
102 * and may change over time. That doesn't stop them from being useful.
103 *
104 * This is the only function in the chain that knows about the byte granular
105 * length in userspace. It converts it to number of stat entries that the
106 * rest of the functions operate in.
107 */
rds_stats_info(struct socket * sock,unsigned int len,struct rds_info_iterator * iter,struct rds_info_lengths * lens)108 static void rds_stats_info(struct socket *sock, unsigned int len,
109 struct rds_info_iterator *iter,
110 struct rds_info_lengths *lens)
111 {
112 struct rds_statistics stats = {0, };
113 uint64_t *src;
114 uint64_t *sum;
115 size_t i;
116 int cpu;
117 unsigned int avail;
118
119 avail = len / sizeof(struct rds_info_counter);
120
121 if (avail < ARRAY_SIZE(rds_stat_names)) {
122 avail = 0;
123 goto trans;
124 }
125
126 for_each_online_cpu(cpu) {
127 src = (uint64_t *)&(per_cpu(rds_stats, cpu));
128 sum = (uint64_t *)&stats;
129 for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
130 *(sum++) += *(src++);
131 }
132
133 rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
134 ARRAY_SIZE(rds_stat_names));
135 avail -= ARRAY_SIZE(rds_stat_names);
136
137 trans:
138 lens->each = sizeof(struct rds_info_counter);
139 lens->nr = rds_trans_stats_info_copy(iter, avail) +
140 ARRAY_SIZE(rds_stat_names);
141 }
142
rds_stats_exit(void)143 void rds_stats_exit(void)
144 {
145 rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
146 }
147
rds_stats_init(void)148 int rds_stats_init(void)
149 {
150 rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
151 return 0;
152 }
153
