LXR linux/arch/s390/appldata/appldata_net

   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/slab.h>
  16#include <linux/errno.h>
  17#include <linux/kernel_stat.h>
  18#include <linux/netdevice.h>
  19#include <net/net_namespace.h>
  20
  21#include "appldata.h"
  22
  23
  24/*
  25 * Network data
  26 *
  27 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  28 * the structure version (product ID, see appldata_base.c) needs to be changed
  29 * as well and all documentation and z/VM applications using it must be updated.
  30 *
  31 * The record layout is documented in the Linux for zSeries Device Drivers
  32 * book:
  33 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  34 */
  35static struct appldata_net_sum_data {
  36        u64 timestamp;
  37        u32 sync_count_1;       /* after VM collected the record data, */
  38        u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  39                                   same. If not, the record has been updated on
  40                                   the Linux side while VM was collecting the
  41                                   (possibly corrupt) data */
  42
  43        u32 nr_interfaces;      /* nr. of network interfaces being monitored */
  44
  45        u32 padding;            /* next value is 64-bit aligned, so these */
  46                                /* 4 byte would be padded out by compiler */
  47
  48        u64 rx_packets;         /* total packets received        */
  49        u64 tx_packets;         /* total packets transmitted     */
  50        u64 rx_bytes;           /* total bytes received          */
  51        u64 tx_bytes;           /* total bytes transmitted       */
  52        u64 rx_errors;          /* bad packets received          */
  53        u64 tx_errors;          /* packet transmit problems      */
  54        u64 rx_dropped;         /* no space in linux buffers     */
  55        u64 tx_dropped;         /* no space available in linux   */
  56        u64 collisions;         /* collisions while transmitting */
  57} __attribute__((packed)) appldata_net_sum_data;
  58
  59
  60/*
  61 * appldata_get_net_sum_data()
  62 *
  63 * gather accumulated network statistics
  64 */
  65static void appldata_get_net_sum_data(void *data)
  66{
  67        int i;
  68        struct appldata_net_sum_data *net_data;
  69        struct net_device *dev;
  70        unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
  71                        tx_errors, rx_dropped, tx_dropped, collisions;
  72
  73        net_data = data;
  74        net_data->sync_count_1++;
  75
  76        i = 0;
  77        rx_packets = 0;
  78        tx_packets = 0;
  79        rx_bytes   = 0;
  80        tx_bytes   = 0;
  81        rx_errors  = 0;
  82        tx_errors  = 0;
  83        rx_dropped = 0;
  84        tx_dropped = 0;
  85        collisions = 0;
  86        read_lock(&dev_base_lock);
  87        for_each_netdev(&init_net, dev) {
  88                const struct net_device_stats *stats = dev_get_stats(dev);
  89
  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        read_unlock(&dev_base_lock);
 102        net_data->nr_interfaces = i;
 103        net_data->rx_packets = rx_packets;
 104        net_data->tx_packets = tx_packets;
 105        net_data->rx_bytes   = rx_bytes;
 106        net_data->tx_bytes   = tx_bytes;
 107        net_data->rx_errors  = rx_errors;
 108        net_data->tx_errors  = tx_errors;
 109        net_data->rx_dropped = rx_dropped;
 110        net_data->tx_dropped = tx_dropped;
 111        net_data->collisions = collisions;
 112
 113        net_data->timestamp = get_clock();
 114        net_data->sync_count_2++;
 115}
 116
 117
 118static struct appldata_ops ops = {
 119        .name      = "net_sum",
 120        .record_nr = APPLDATA_RECORD_NET_SUM_ID,
 121        .size      = sizeof(struct appldata_net_sum_data),
 122        .callback  = &appldata_get_net_sum_data,
 123        .data      = &appldata_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        return appldata_register_ops(&ops);
 137}
 138
 139/*
 140 * appldata_net_exit()
 141 *
 142 * unregister ops
 143 */
 144static void __exit appldata_net_exit(void)
 145{
 146        appldata_unregister_ops(&ops);
 147}
 148
 149
 150module_init(appldata_net_init);
 151module_exit(appldata_net_exit);
 152
 153MODULE_LICENSE("GPL");
 154MODULE_AUTHOR("Gerald Schaefer");
 155MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");
 156