1/* 2 * arch/s390/appldata/appldata_net_sum.c 3 * 4 * Data gathering module for Linux-VM Monitor Stream, Stage 1. 5 * Collects accumulated network statistics (Packets received/transmitted, 6 * dropped, errors, ...). 7 * 8 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH. 9 * 10 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> 11 */ 12 13#include <linux/module.h> 14#include <linux/init.h> 15#include <linux/errno.h> 16#include <linux/kernel_stat.h> 17#include <linux/netdevice.h> 18#include <net/net_namespace.h> 19 20#include "appldata.h" 21 22 23/* 24 * Network data 25 * 26 * This is accessed as binary data by z/VM. If changes to it can't be avoided, 27 * the structure version (product ID, see appldata_base.c) needs to be changed 28 * as well and all documentation and z/VM applications using it must be updated. 29 * 30 * The record layout is documented in the Linux for zSeries Device Drivers 31 * book: 32 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml 33 */ 34static struct appldata_net_sum_data { 35 u64 timestamp; 36 u32 sync_count_1; /* after VM collected the record data, */ 37 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the 38 same. If not, the record has been updated on 39 the Linux side while VM was collecting the 40 (possibly corrupt) data */ 41 42 u32 nr_interfaces; /* nr. of network interfaces being monitored */ 43 44 u32 padding; /* next value is 64-bit aligned, so these */ 45 /* 4 byte would be padded out by compiler */ 46 47 u64 rx_packets; /* total packets received */ 48 u64 tx_packets; /* total packets transmitted */ 49 u64 rx_bytes; /* total bytes received */ 50 u64 tx_bytes; /* total bytes transmitted */ 51 u64 rx_errors; /* bad packets received */ 52 u64 tx_errors; /* packet transmit problems */ 53 u64 rx_dropped; /* no space in linux buffers */ 54 u64 tx_dropped; /* no space available in linux */ 55 u64 collisions; /* collisions while transmitting */ 56} __attribute__((packed)) appldata_net_sum_data; 57 58 59/* 60 * appldata_get_net_sum_data() 61 * 62 * gather accumulated network statistics 63 */ 64static void appldata_get_net_sum_data(void *data) 65{ 66 int i; 67 struct appldata_net_sum_data *net_data; 68 struct net_device *dev; 69 unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors, 70 tx_errors, rx_dropped, tx_dropped, collisions; 71 72 net_data = data; 73 net_data->sync_count_1++; 74 75 i = 0; 76 rx_packets = 0; 77 tx_packets = 0; 78 rx_bytes = 0; 79 tx_bytes = 0; 80 rx_errors = 0; 81 tx_errors = 0; 82 rx_dropped = 0; 83 tx_dropped = 0; 84 collisions = 0; 85 86 rcu_read_lock(); 87 for_each_netdev_rcu(&init_net, dev) { 88 const struct rtnl_link_stats64 *stats; 89 struct rtnl_link_stats64 temp; 90 91 stats = dev_get_stats(dev, &temp); 92 rx_packets += stats->rx_packets; 93 tx_packets += stats->tx_packets; 94 rx_bytes += stats->rx_bytes; 95 tx_bytes += stats->tx_bytes; 96 rx_errors += stats->rx_errors; 97 tx_errors += stats->tx_errors; 98 rx_dropped += stats->rx_dropped; 99 tx_dropped += stats->tx_dropped; 100 collisions += stats->collisions; 101 i++; 102 } 103 rcu_read_unlock(); 104 105 net_data->nr_interfaces = i; 106 net_data->rx_packets = rx_packets; 107 net_data->tx_packets = tx_packets; 108 net_data->rx_bytes = rx_bytes; 109 net_data->tx_bytes = tx_bytes; 110 net_data->rx_errors = rx_errors; 111 net_data->tx_errors = tx_errors; 112 net_data->rx_dropped = rx_dropped; 113 net_data->tx_dropped = tx_dropped; 114 net_data->collisions = collisions; 115 116 net_data->timestamp = get_clock(); 117 net_data->sync_count_2++; 118} 119 120 121static struct appldata_ops ops = { 122 .name = "net_sum", 123 .record_nr = APPLDATA_RECORD_NET_SUM_ID, 124 .size = sizeof(struct appldata_net_sum_data), 125 .callback = &appldata_get_net_sum_data, 126 .data = &appldata_net_sum_data, 127 .owner = THIS_MODULE, 128 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */ 129}; 130 131 132/* 133 * appldata_net_init() 134 * 135 * init data, register ops 136 */ 137static int __init appldata_net_init(void) 138{ 139 return appldata_register_ops(&ops); 140} 141 142/* 143 * appldata_net_exit() 144 * 145 * unregister ops 146 */ 147static void __exit appldata_net_exit(void) 148{ 149 appldata_unregister_ops(&ops); 150} 151 152 153module_init(appldata_net_init); 154module_exit(appldata_net_exit); 155 156MODULE_LICENSE("GPL"); 157MODULE_AUTHOR("Gerald Schaefer"); 158MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics"); 159