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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 , . . . ) .
*
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* Copyright ( C ) 2003 , 2006 IBM Corporation , IBM Deutschland Entwicklung GmbH .
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*
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* Author : Gerald Schaefer < gerald . schaefer @ de . ibm . com >
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*/
# include <linux/module.h>
# include <linux/init.h>
# include <linux/errno.h>
# include <linux/kernel_stat.h>
# include <linux/netdevice.h>
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# include <net/net_namespace.h>
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# 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
*/
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static struct appldata_net_sum_data {
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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 */
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} __attribute__ ( ( packed ) ) appldata_net_sum_data ;
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/*
* 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 ;
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 ;
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rcu_read_lock ( ) ;
for_each_netdev_rcu ( & init_net , dev ) {
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struct rtnl_link_stats64 temp ;
const struct net_device_stats * stats = dev_get_stats ( dev , & temp ) ;
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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 + + ;
}
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rcu_read_unlock ( ) ;
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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 ,
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. mod_lvl = { 0xF0 , 0xF0 } , /* EBCDIC "00" */
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} ;
/*
* appldata_net_init ( )
*
* init data , register ops
*/
static int __init appldata_net_init ( void )
{
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return appldata_register_ops ( & ops ) ;
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}
/*
* 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 " ) ;