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/*
* Copyright (c) 2006 Oracle. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <linux/percpu.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/export.h>
#include "rds.h"
DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
EXPORT_PER_CPU_SYMBOL_GPL(rds_stats);
/* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
static const char *const rds_stat_names[] = {
"conn_reset",
"recv_drop_bad_checksum",
"recv_drop_old_seq",
"recv_drop_no_sock",
"recv_drop_dead_sock",
"recv_deliver_raced",
"recv_delivered",
"recv_queued",
"recv_immediate_retry",
"recv_delayed_retry",
"recv_ack_required",
"recv_rdma_bytes",
"recv_ping",
"send_queue_empty",
"send_queue_full",
"send_lock_contention",
"send_lock_queue_raced",
"send_immediate_retry",
"send_delayed_retry",
"send_drop_acked",
"send_ack_required",
"send_queued",
"send_rdma",
"send_rdma_bytes",
"send_pong",
"page_remainder_hit",
"page_remainder_miss",
"copy_to_user",
"copy_from_user",
"cong_update_queued",
"cong_update_received",
"cong_send_error",
"cong_send_blocked",
};
void rds_stats_info_copy(struct rds_info_iterator *iter,
uint64_t *values, const char *const *names, size_t nr)
{
struct rds_info_counter ctr;
size_t i;
for (i = 0; i < nr; i++) {
BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
ctr.value = values[i];
rds_info_copy(iter, &ctr, sizeof(ctr));
}
}
EXPORT_SYMBOL_GPL(rds_stats_info_copy);
/*
* This gives global counters across all the transports. The strings
* are copied in so that the tool doesn't need knowledge of the specific
* stats that we're exporting. Some are pretty implementation dependent
* and may change over time. That doesn't stop them from being useful.
*
* This is the only function in the chain that knows about the byte granular
* length in userspace. It converts it to number of stat entries that the
* rest of the functions operate in.
*/
static void rds_stats_info(struct socket *sock, unsigned int len,
struct rds_info_iterator *iter,
struct rds_info_lengths *lens)
{
struct rds_statistics stats = {0, };
uint64_t *src;
uint64_t *sum;
size_t i;
int cpu;
unsigned int avail;
avail = len / sizeof(struct rds_info_counter);
if (avail < ARRAY_SIZE(rds_stat_names)) {
avail = 0;
goto trans;
}
for_each_online_cpu(cpu) {
src = (uint64_t *)&(per_cpu(rds_stats, cpu));
sum = (uint64_t *)&stats;
for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
*(sum++) += *(src++);
}
rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
ARRAY_SIZE(rds_stat_names));
avail -= ARRAY_SIZE(rds_stat_names);
trans:
lens->each = sizeof(struct rds_info_counter);
lens->nr = rds_trans_stats_info_copy(iter, avail) +
ARRAY_SIZE(rds_stat_names);
}
void rds_stats_exit(void)
{
rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
}
int rds_stats_init(void)
{
rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
return 0;
}
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