linux/net/rds/tcp_stats.c
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   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#include "tcp.h"
  39
  40DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats)
  41        ____cacheline_aligned;
  42
  43static const char * const rds_tcp_stat_names[] = {
  44        "tcp_data_ready_calls",
  45        "tcp_write_space_calls",
  46        "tcp_sndbuf_full",
  47        "tcp_connect_raced",
  48        "tcp_listen_closed_stale",
  49};
  50
  51unsigned int rds_tcp_stats_info_copy(struct rds_info_iterator *iter,
  52                                     unsigned int avail)
  53{
  54        struct rds_tcp_statistics stats = {0, };
  55        uint64_t *src;
  56        uint64_t *sum;
  57        size_t i;
  58        int cpu;
  59
  60        if (avail < ARRAY_SIZE(rds_tcp_stat_names))
  61                goto out;
  62
  63        for_each_online_cpu(cpu) {
  64                src = (uint64_t *)&(per_cpu(rds_tcp_stats, cpu));
  65                sum = (uint64_t *)&stats;
  66                for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
  67                        *(sum++) += *(src++);
  68        }
  69
  70        rds_stats_info_copy(iter, (uint64_t *)&stats, rds_tcp_stat_names,
  71                            ARRAY_SIZE(rds_tcp_stat_names));
  72out:
  73        return ARRAY_SIZE(rds_tcp_stat_names);
  74}
  75
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