linux/arch/s390/appldata/appldata_net_sum.c
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   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
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