Root/net/rds/ib_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 "ib.h"
39
40DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
41
42static const char *const rds_ib_stat_names[] = {
43    "ib_connect_raced",
44    "ib_listen_closed_stale",
45    "ib_tx_cq_call",
46    "ib_tx_cq_event",
47    "ib_tx_ring_full",
48    "ib_tx_throttle",
49    "ib_tx_sg_mapping_failure",
50    "ib_tx_stalled",
51    "ib_tx_credit_updates",
52    "ib_rx_cq_call",
53    "ib_rx_cq_event",
54    "ib_rx_ring_empty",
55    "ib_rx_refill_from_cq",
56    "ib_rx_refill_from_thread",
57    "ib_rx_alloc_limit",
58    "ib_rx_credit_updates",
59    "ib_ack_sent",
60    "ib_ack_send_failure",
61    "ib_ack_send_delayed",
62    "ib_ack_send_piggybacked",
63    "ib_ack_received",
64    "ib_rdma_mr_alloc",
65    "ib_rdma_mr_free",
66    "ib_rdma_mr_used",
67    "ib_rdma_mr_pool_flush",
68    "ib_rdma_mr_pool_wait",
69    "ib_rdma_mr_pool_depleted",
70};
71
72unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
73                    unsigned int avail)
74{
75    struct rds_ib_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_ib_stat_names))
82        goto out;
83
84    for_each_online_cpu(cpu) {
85        src = (uint64_t *)&(per_cpu(rds_ib_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_ib_stat_names,
92                ARRAY_SIZE(rds_ib_stat_names));
93out:
94    return ARRAY_SIZE(rds_ib_stat_names);
95}
96

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