LXR linux/arch/s390/appldata/appldata_net

   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 */
  32struct 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 */
  62static 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
 119static 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 */
 134static 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 */
 154static void __exit appldata_net_exit(void)
 155{
 156        appldata_unregister_ops(&ops);
 157        kfree(ops.data);
 158}
 159
 160
 161module_init(appldata_net_init);
 162module_exit(appldata_net_exit);
 163
 164MODULE_LICENSE("GPL");
 165MODULE_AUTHOR("Gerald Schaefer");
 166MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");
 167