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 }