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