Merge tag 'v5.4-rockchip-dts32-2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.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 #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
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  */
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
143 void rds_stats_exit(void)
144 {
145         rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
146 }
147
148 int rds_stats_init(void)
149 {
150         rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
151         return 0;
152 }