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 "recv_bytes_added_to_sock",
80 "recv_bytes_freed_fromsock",
81 "send_stuck_rm",
82 };
83
84 void rds_stats_info_copy(struct rds_info_iterator *iter,
85 uint64_t *values, const char *const *names, size_t nr)
86 {
87 struct rds_info_counter ctr;
88 size_t i;
89
90 for (i = 0; i < nr; i++) {
91 BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
92 strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
93 ctr.name[sizeof(ctr.name) - 1] = '\0';
94 ctr.value = values[i];
95
96 rds_info_copy(iter, &ctr, sizeof(ctr));
97 }
98 }
99 EXPORT_SYMBOL_GPL(rds_stats_info_copy);
100
101 /*
102 * This gives global counters across all the transports. The strings
103 * are copied in so that the tool doesn't need knowledge of the specific
104 * stats that we're exporting. Some are pretty implementation dependent
105 * and may change over time. That doesn't stop them from being useful.
106 *
107 * This is the only function in the chain that knows about the byte granular
108 * length in userspace. It converts it to number of stat entries that the
109 * rest of the functions operate in.
110 */
111 static void rds_stats_info(struct socket *sock, unsigned int len,
112 struct rds_info_iterator *iter,
113 struct rds_info_lengths *lens)
114 {
115 struct rds_statistics stats = {0, };
116 uint64_t *src;
117 uint64_t *sum;
118 size_t i;
119 int cpu;
120 unsigned int avail;
121
122 avail = len / sizeof(struct rds_info_counter);
123
124 if (avail < ARRAY_SIZE(rds_stat_names)) {
125 avail = 0;
126 goto trans;
127 }
128
129 for_each_online_cpu(cpu) {
130 src = (uint64_t *)&(per_cpu(rds_stats, cpu));
131 sum = (uint64_t *)&stats;
132 for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
133 *(sum++) += *(src++);
134 }
135
136 rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
137 ARRAY_SIZE(rds_stat_names));
138 avail -= ARRAY_SIZE(rds_stat_names);
139
140 trans:
141 lens->each = sizeof(struct rds_info_counter);
142 lens->nr = rds_trans_stats_info_copy(iter, avail) +
143 ARRAY_SIZE(rds_stat_names);
144 }
145
146 void rds_stats_exit(void)
147 {
148 rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
149 }
150
151 int rds_stats_init(void)
152 {
153 rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
154 return 0;
155 }
156
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