1 /* 2 * Data gathering module for Linux-VM Monitor Stream, Stage 1. 3 * Collects accumulated network statistics (Packets received/transmitted, 4 * dropped, errors, ...). 5 * 6 * Copyright IBM Corp. 2003, 2006 7 * 8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/errno.h> 14 #include <linux/kernel_stat.h> 15 #include <linux/netdevice.h> 16 #include <net/net_namespace.h> 17 18 #include "appldata.h" 19 20 21 /* 22 * Network data 23 * 24 * This is accessed as binary data by z/VM. If changes to it can't be avoided, 25 * the structure version (product ID, see appldata_base.c) needs to be changed 26 * as well and all documentation and z/VM applications using it must be updated. 27 * 28 * The record layout is documented in the Linux for zSeries Device Drivers 29 * book: 30 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml 31 */ 32 struct appldata_net_sum_data { 33 u64 timestamp; 34 u32 sync_count_1; /* after VM collected the record data, */ 35 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the 36 same. If not, the record has been updated on 37 the Linux side while VM was collecting the 38 (possibly corrupt) data */ 39 40 u32 nr_interfaces; /* nr. of network interfaces being monitored */ 41 42 u32 padding; /* next value is 64-bit aligned, so these */ 43 /* 4 byte would be padded out by compiler */ 44 45 u64 rx_packets; /* total packets received */ 46 u64 tx_packets; /* total packets transmitted */ 47 u64 rx_bytes; /* total bytes received */ 48 u64 tx_bytes; /* total bytes transmitted */ 49 u64 rx_errors; /* bad packets received */ 50 u64 tx_errors; /* packet transmit problems */ 51 u64 rx_dropped; /* no space in linux buffers */ 52 u64 tx_dropped; /* no space available in linux */ 53 u64 collisions; /* collisions while transmitting */ 54 } __packed; 55 56 57 /* 58 * appldata_get_net_sum_data() 59 * 60 * gather accumulated network statistics 61 */ 62 static void appldata_get_net_sum_data(void *data) 63 { 64 int i; 65 struct appldata_net_sum_data *net_data; 66 struct net_device *dev; 67 unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors, 68 tx_errors, rx_dropped, tx_dropped, collisions; 69 70 net_data = data; 71 net_data->sync_count_1++; 72 73 i = 0; 74 rx_packets = 0; 75 tx_packets = 0; 76 rx_bytes = 0; 77 tx_bytes = 0; 78 rx_errors = 0; 79 tx_errors = 0; 80 rx_dropped = 0; 81 tx_dropped = 0; 82 collisions = 0; 83 84 rcu_read_lock(); 85 for_each_netdev_rcu(&init_net, dev) { 86 const struct rtnl_link_stats64 *stats; 87 struct rtnl_link_stats64 temp; 88 89 stats = dev_get_stats(dev, &temp); 90 rx_packets += stats->rx_packets; 91 tx_packets += stats->tx_packets; 92 rx_bytes += stats->rx_bytes; 93 tx_bytes += stats->tx_bytes; 94 rx_errors += stats->rx_errors; 95 tx_errors += stats->tx_errors; 96 rx_dropped += stats->rx_dropped; 97 tx_dropped += stats->tx_dropped; 98 collisions += stats->collisions; 99 i++; 100 } 101 rcu_read_unlock(); 102 103 net_data->nr_interfaces = i; 104 net_data->rx_packets = rx_packets; 105 net_data->tx_packets = tx_packets; 106 net_data->rx_bytes = rx_bytes; 107 net_data->tx_bytes = tx_bytes; 108 net_data->rx_errors = rx_errors; 109 net_data->tx_errors = tx_errors; 110 net_data->rx_dropped = rx_dropped; 111 net_data->tx_dropped = tx_dropped; 112 net_data->collisions = collisions; 113 114 net_data->timestamp = get_tod_clock(); 115 net_data->sync_count_2++; 116 } 117 118 119 static struct appldata_ops ops = { 120 .name = "net_sum", 121 .record_nr = APPLDATA_RECORD_NET_SUM_ID, 122 .size = sizeof(struct appldata_net_sum_data), 123 .callback = &appldata_get_net_sum_data, 124 .owner = THIS_MODULE, 125 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */ 126 }; 127 128 129 /* 130 * appldata_net_init() 131 * 132 * init data, register ops 133 */ 134 static int __init appldata_net_init(void) 135 { 136 int ret; 137 138 ops.data = kzalloc(sizeof(struct appldata_net_sum_data), GFP_KERNEL); 139 if (!ops.data) 140 return -ENOMEM; 141 142 ret = appldata_register_ops(&ops); 143 if (ret) 144 kfree(ops.data); 145 146 return ret; 147 } 148 149 /* 150 * appldata_net_exit() 151 * 152 * unregister ops 153 */ 154 static void __exit appldata_net_exit(void) 155 { 156 appldata_unregister_ops(&ops); 157 kfree(ops.data); 158 } 159 160 161 module_init(appldata_net_init); 162 module_exit(appldata_net_exit); 163 164 MODULE_LICENSE("GPL"); 165 MODULE_AUTHOR("Gerald Schaefer"); 166 MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics"); 167