RDS/IB: get the xmit max_sge from the RDS IB device on the connection
[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 EXPORT_PER_CPU_SYMBOL_GPL(rds_stats);
41
42 /* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
43
44 static 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_lock_contention",
61         "send_lock_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
80 void 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 }
94 EXPORT_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  */
106 static 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
135 trans:
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
141 void rds_stats_exit(void)
142 {
143         rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
144 }
145
146 int __init rds_stats_init(void)
147 {
148         rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
149         return 0;
150 }