LXR linux/net/rds/iw

   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 "iw.h"
  39
  40DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_iw_statistics, rds_iw_stats);
  41
  42static const char *const rds_iw_stat_names[] = {
  43        "iw_connect_raced",
  44        "iw_listen_closed_stale",
  45        "iw_tx_cq_call",
  46        "iw_tx_cq_event",
  47        "iw_tx_ring_full",
  48        "iw_tx_throttle",
  49        "iw_tx_sg_mapping_failure",
  50        "iw_tx_stalled",
  51        "iw_tx_credit_updates",
  52        "iw_rx_cq_call",
  53        "iw_rx_cq_event",
  54        "iw_rx_ring_empty",
  55        "iw_rx_refill_from_cq",
  56        "iw_rx_refill_from_thread",
  57        "iw_rx_alloc_limit",
  58        "iw_rx_credit_updates",
  59        "iw_ack_sent",
  60        "iw_ack_send_failure",
  61        "iw_ack_send_delayed",
  62        "iw_ack_send_piggybacked",
  63        "iw_ack_received",
  64        "iw_rdma_mr_alloc",
  65        "iw_rdma_mr_free",
  66        "iw_rdma_mr_used",
  67        "iw_rdma_mr_pool_flush",
  68        "iw_rdma_mr_pool_wait",
  69        "iw_rdma_mr_pool_depleted",
  70};
  71
  72unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter,
  73                                    unsigned int avail)
  74{
  75        struct rds_iw_statistics stats = {0, };
  76        uint64_t *src;
  77        uint64_t *sum;
  78        size_t i;
  79        int cpu;
  80
  81        if (avail < ARRAY_SIZE(rds_iw_stat_names))
  82                goto out;
  83
  84        for_each_online_cpu(cpu) {
  85                src = (uint64_t *)&(per_cpu(rds_iw_stats, cpu));
  86                sum = (uint64_t *)&stats;
  87                for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
  88                        *(sum++) += *(src++);
  89        }
  90
  91        rds_stats_info_copy(iter, (uint64_t *)&stats, rds_iw_stat_names,
  92                            ARRAY_SIZE(rds_iw_stat_names));
  93out:
  94        return ARRAY_SIZE(rds_iw_stat_names);
  95}
  96