Logo Search packages:      
Sourcecode: linux version File versions  Download package

appldata_net_sum.c

/*
 * arch/s390/appldata/appldata_net_sum.c
 *
 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
 * Collects accumulated network statistics (Packets received/transmitted,
 * dropped, errors, ...).
 *
 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/netdevice.h>
#include <net/net_namespace.h>

#include "appldata.h"


/*
 * Network data
 *
 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
 * the structure version (product ID, see appldata_base.c) needs to be changed
 * as well and all documentation and z/VM applications using it must be updated.
 *
 * The record layout is documented in the Linux for zSeries Device Drivers
 * book:
 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
 */
static struct appldata_net_sum_data {
      u64 timestamp;
      u32 sync_count_1; /* after VM collected the record data, */
      u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
                           same. If not, the record has been updated on
                           the Linux side while VM was collecting the
                           (possibly corrupt) data */

      u32 nr_interfaces;      /* nr. of network interfaces being monitored */

      u32 padding;            /* next value is 64-bit aligned, so these */
                        /* 4 byte would be padded out by compiler */

      u64 rx_packets;         /* total packets received        */
      u64 tx_packets;         /* total packets transmitted     */
      u64 rx_bytes;           /* total bytes received          */
      u64 tx_bytes;           /* total bytes transmitted       */
      u64 rx_errors;          /* bad packets received          */
      u64 tx_errors;          /* packet transmit problems      */
      u64 rx_dropped;         /* no space in linux buffers     */
      u64 tx_dropped;         /* no space available in linux   */
      u64 collisions;         /* collisions while transmitting */
} __attribute__((packed)) appldata_net_sum_data;


/*
 * appldata_get_net_sum_data()
 *
 * gather accumulated network statistics
 */
static void appldata_get_net_sum_data(void *data)
{
      int i;
      struct appldata_net_sum_data *net_data;
      struct net_device *dev;
      struct net_device_stats *stats;
      unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
                  tx_errors, rx_dropped, tx_dropped, collisions;

      net_data = data;
      net_data->sync_count_1++;

      i = 0;
      rx_packets = 0;
      tx_packets = 0;
      rx_bytes   = 0;
      tx_bytes   = 0;
      rx_errors  = 0;
      tx_errors  = 0;
      rx_dropped = 0;
      tx_dropped = 0;
      collisions = 0;
      read_lock(&dev_base_lock);
      for_each_netdev(&init_net, dev) {
            stats = dev->get_stats(dev);
            rx_packets += stats->rx_packets;
            tx_packets += stats->tx_packets;
            rx_bytes   += stats->rx_bytes;
            tx_bytes   += stats->tx_bytes;
            rx_errors  += stats->rx_errors;
            tx_errors  += stats->tx_errors;
            rx_dropped += stats->rx_dropped;
            tx_dropped += stats->tx_dropped;
            collisions += stats->collisions;
            i++;
      }
      read_unlock(&dev_base_lock);
      net_data->nr_interfaces = i;
      net_data->rx_packets = rx_packets;
      net_data->tx_packets = tx_packets;
      net_data->rx_bytes   = rx_bytes;
      net_data->tx_bytes   = tx_bytes;
      net_data->rx_errors  = rx_errors;
      net_data->tx_errors  = tx_errors;
      net_data->rx_dropped = rx_dropped;
      net_data->tx_dropped = tx_dropped;
      net_data->collisions = collisions;

      net_data->timestamp = get_clock();
      net_data->sync_count_2++;
}


static struct appldata_ops ops = {
      .name    = "net_sum",
      .record_nr = APPLDATA_RECORD_NET_SUM_ID,
      .size    = sizeof(struct appldata_net_sum_data),
      .callback  = &appldata_get_net_sum_data,
      .data      = &appldata_net_sum_data,
      .owner     = THIS_MODULE,
      .mod_lvl   = {0xF0, 0xF0},          /* EBCDIC "00" */
};


/*
 * appldata_net_init()
 *
 * init data, register ops
 */
static int __init appldata_net_init(void)
{
      return appldata_register_ops(&ops);
}

/*
 * appldata_net_exit()
 *
 * unregister ops
 */
static void __exit appldata_net_exit(void)
{
      appldata_unregister_ops(&ops);
}


module_init(appldata_net_init);
module_exit(appldata_net_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gerald Schaefer");
MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");

Generated by  Doxygen 1.6.0   Back to index