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/*

 * 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"

#define MY_PRINT_NAME   "appldata_net_sum"      /* for debug messages, etc. */

/*

 * 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;

static inline void appldata_print_debug(struct appldata_net_sum_data *net_data)

{

        P_DEBUG("--- NET - RECORD ---\n");

        P_DEBUG("nr_interfaces = %u\n", net_data->nr_interfaces);

        P_DEBUG("rx_packets    = %8lu\n", net_data->rx_packets);

        P_DEBUG("tx_packets    = %8lu\n", net_data->tx_packets);

        P_DEBUG("rx_bytes      = %8lu\n", net_data->rx_bytes);

        P_DEBUG("tx_bytes      = %8lu\n", net_data->tx_bytes);

        P_DEBUG("rx_errors     = %8lu\n", net_data->rx_errors);

        P_DEBUG("tx_errors     = %8lu\n", net_data->tx_errors);

        P_DEBUG("rx_dropped    = %8lu\n", net_data->rx_dropped);

        P_DEBUG("tx_dropped    = %8lu\n", net_data->tx_dropped);

        P_DEBUG("collisions    = %8lu\n", net_data->collisions);

        P_DEBUG("sync_count_1 = %u\n", net_data->sync_count_1);

        P_DEBUG("sync_count_2 = %u\n", net_data->sync_count_2);

        P_DEBUG("timestamp    = %lX\n", net_data->timestamp);

}

/*

 * 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++;

#ifdef APPLDATA_DEBUG

        appldata_print_debug(net_data);

#endif

}

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)

{

        int rc;

        P_DEBUG("sizeof(net) = %lu\n", sizeof(struct appldata_net_sum_data));

        rc = appldata_register_ops(&ops);

        if (rc != 0) {

                P_ERROR("Error registering ops, rc = %i\n", rc);

        } else {

                P_DEBUG("%s-ops registered!\n", ops.name);

        }

        return rc;

}

/*

 * appldata_net_exit()

 *

 * unregister ops

 */

static void __exit appldata_net_exit(void)

{

        appldata_unregister_ops(&ops);

        P_DEBUG("%s-ops unregistered!\n", ops.name);

}

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");