LXR linux/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
  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