appldata_net_sum.c
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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 "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(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 = {
.ctl_nr = CTL_APPLDATA_NET_SUM,
.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");