cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tcp_stats.c (2399B)

      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 "tcp.h"
     39
     40DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats)
     41	____cacheline_aligned;
     42
     43static const char * const rds_tcp_stat_names[] = {
     44	"tcp_data_ready_calls",
     45	"tcp_write_space_calls",
     46	"tcp_sndbuf_full",
     47	"tcp_connect_raced",
     48	"tcp_listen_closed_stale",
     49};
     50
     51unsigned int rds_tcp_stats_info_copy(struct rds_info_iterator *iter,
     52				     unsigned int avail)
     53{
     54	struct rds_tcp_statistics stats = {0, };
     55	uint64_t *src;
     56	uint64_t *sum;
     57	size_t i;
     58	int cpu;
     59
     60	if (avail < ARRAY_SIZE(rds_tcp_stat_names))
     61		goto out;
     62
     63	for_each_online_cpu(cpu) {
     64		src = (uint64_t *)&(per_cpu(rds_tcp_stats, cpu));
     65		sum = (uint64_t *)&stats;
     66		for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
     67			*(sum++) += *(src++);
     68	}
     69
     70	rds_stats_info_copy(iter, (uint64_t *)&stats, rds_tcp_stat_names,
     71			    ARRAY_SIZE(rds_tcp_stat_names));
     72out:
     73	return ARRAY_SIZE(rds_tcp_stat_names);
     74}