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 40 DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats) 41 ____cacheline_aligned; 42 43 static 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 rds_tcp_stats_info_copy(struct rds_info_iterator * iter,unsigned int avail)51 unsigned 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)); 72 out: 73 return ARRAY_SIZE(rds_tcp_stat_names); 74 } 75