net/rds/iw_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 #include "iw.h"
  39
  40 DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_iw_statistics, rds_iw_stats);
  41
  42 static 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
  72 unsigned 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));
  93 out:
  94         return ARRAY_SIZE(rds_iw_stat_names);
  95 }