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