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#include <linux/export.h>
 37
 38#include "rds.h"
 39
 40DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
 41EXPORT_PER_CPU_SYMBOL_GPL(rds_stats);
 42
 43/* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
 44
 45static const char *const rds_stat_names[] = {
 46	"conn_reset",
 47	"recv_drop_bad_checksum",
 48	"recv_drop_old_seq",
 49	"recv_drop_no_sock",
 50	"recv_drop_dead_sock",
 51	"recv_deliver_raced",
 52	"recv_delivered",
 53	"recv_queued",
 54	"recv_immediate_retry",
 55	"recv_delayed_retry",
 56	"recv_ack_required",
 57	"recv_rdma_bytes",
 58	"recv_ping",
 59	"send_queue_empty",
 60	"send_queue_full",
 61	"send_lock_contention",
 62	"send_lock_queue_raced",
 63	"send_immediate_retry",
 64	"send_delayed_retry",
 65	"send_drop_acked",
 66	"send_ack_required",
 67	"send_queued",
 68	"send_rdma",
 69	"send_rdma_bytes",
 70	"send_pong",
 71	"page_remainder_hit",
 72	"page_remainder_miss",
 73	"copy_to_user",
 74	"copy_from_user",
 75	"cong_update_queued",
 76	"cong_update_received",
 77	"cong_send_error",
 78	"cong_send_blocked",
 79	"recv_bytes_added_to_sock",
 80	"recv_bytes_freed_fromsock",
 81	"send_stuck_rm",
 82};
 83
 84void rds_stats_info_copy(struct rds_info_iterator *iter,
 85			 uint64_t *values, const char *const *names, size_t nr)
 86{
 87	struct rds_info_counter ctr;
 88	size_t i;
 89
 90	for (i = 0; i < nr; i++) {
 91		BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
 92		strscpy_pad(ctr.name, names[i]);
 93		ctr.value = values[i];
 94
 95		rds_info_copy(iter, &ctr, sizeof(ctr));
 96	}
 97}
 98EXPORT_SYMBOL_GPL(rds_stats_info_copy);
 99
100/*
101 * This gives global counters across all the transports.  The strings
102 * are copied in so that the tool doesn't need knowledge of the specific
103 * stats that we're exporting.  Some are pretty implementation dependent
104 * and may change over time.  That doesn't stop them from being useful.
105 *
106 * This is the only function in the chain that knows about the byte granular
107 * length in userspace.  It converts it to number of stat entries that the
108 * rest of the functions operate in.
109 */
110static void rds_stats_info(struct socket *sock, unsigned int len,
111			   struct rds_info_iterator *iter,
112			   struct rds_info_lengths *lens)
113{
114	struct rds_statistics stats = {0, };
115	uint64_t *src;
116	uint64_t *sum;
117	size_t i;
118	int cpu;
119	unsigned int avail;
120
121	avail = len / sizeof(struct rds_info_counter);
122
123	if (avail < ARRAY_SIZE(rds_stat_names)) {
124		avail = 0;
125		goto trans;
126	}
127
128	for_each_online_cpu(cpu) {
129		src = (uint64_t *)&(per_cpu(rds_stats, cpu));
130		sum = (uint64_t *)&stats;
131		for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
132			*(sum++) += *(src++);
133	}
134
135	rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
136			    ARRAY_SIZE(rds_stat_names));
137	avail -= ARRAY_SIZE(rds_stat_names);
138
139trans:
140	lens->each = sizeof(struct rds_info_counter);
141	lens->nr = rds_trans_stats_info_copy(iter, avail) +
142		   ARRAY_SIZE(rds_stat_names);
143}
144
145void rds_stats_exit(void)
146{
147	rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
148}
149
150int rds_stats_init(void)
151{
152	rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
153	return 0;
154}