/* * 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 IBM Corporation, IBM Deutschland Entwicklung GmbH. * * Author: Gerald Schaefer <geraldsc@de.ibm.com> */#include <linux/config.h>#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 */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 */} 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 (dev = dev_base; dev != NULL; dev = dev->next) {		if (dev->get_stats == NULL) {			continue;		}		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,};/* * 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");