/**
* Copyright (C) ARM Limited 2010-2011. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include "gator.h"
#include <linux/netdevice.h>
#define NETRX 0
#define NETTX 1
#define NETDRV 2
#define TOTALNET (NETDRV+1)
static ulong netdrv_enabled;
static ulong netrx_enabled;
static ulong nettx_enabled;
static ulong netdrv_key;
static ulong netrx_key;
static ulong nettx_key;
static int rx_total, tx_total;
static ulong netPrev[TOTALNET];
static int netGet[TOTALNET * 2];
static void get_network_stats(struct work_struct *wsptr) {
int rx = 0, tx = 0;
struct net_device *dev;
for_each_netdev(&init_net, dev) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
const struct net_device_stats *stats = dev_get_stats(dev);
#else
struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
#endif
rx += stats->rx_bytes;
tx += stats->tx_bytes;
}
rx_total = rx;
tx_total = tx;
}
DECLARE_WORK(wq_get_stats, get_network_stats);
static void calculate_delta(int *drv, int *rx, int *tx)
{
int drv_calc, rx_calc, tx_calc;
drv_calc = gator_net_traffic - netPrev[NETDRV];
if (drv_calc > 0) {
netPrev[NETDRV] += drv_calc;
netPrev[NETTX] += drv_calc;
// remove tcp/ip header overhead
// approximation based on empirical measurement
netPrev[NETRX] += drv_calc / 42;
netPrev[NETTX] += drv_calc / 18;
}
rx_calc = (int)(rx_total - netPrev[NETRX]);
if (rx_calc < 0)
rx_calc = 0;
netPrev[NETRX] += rx_calc;
tx_calc = (int)(tx_total - netPrev[NETTX]);
if (tx_calc < 0)
tx_calc = 0;
netPrev[NETTX] += tx_calc;
*drv = drv_calc;
*rx = rx_calc;
*tx = tx_calc;
}
static int gator_events_net_create_files(struct super_block *sb, struct dentry *root)
{
struct dentry *dir;
dir = gatorfs_mkdir(sb, root, "Linux_net_drv");
if (!dir) {
return -1;
}
gatorfs_create_ulong(sb, dir, "enabled", &netdrv_enabled);
gatorfs_create_ro_ulong(sb, dir, "key", &netdrv_key);
dir = gatorfs_mkdir(sb, root, "Linux_net_rx");
if (!dir) {
return -1;
}
gatorfs_create_ulong(sb, dir, "enabled", &netrx_enabled);
gatorfs_create_ro_ulong(sb, dir, "key", &netrx_key);
dir = gatorfs_mkdir(sb, root, "Linux_net_tx");
if (!dir) {
return -1;
}
gatorfs_create_ulong(sb, dir, "enabled", &nettx_enabled);
gatorfs_create_ro_ulong(sb, dir, "key", &nettx_key);
return 0;
}
static int gator_events_net_start(void)
{
get_network_stats(NULL);
netPrev[NETDRV] = 0;
netPrev[NETRX] = rx_total;
netPrev[NETTX] = tx_total;
return 0;
}
static void gator_events_net_stop(void)
{
netdrv_enabled = 0;
netrx_enabled = 0;
nettx_enabled = 0;
}
static int gator_events_net_read(int **buffer)
{
int len, drv_delta, rx_delta, tx_delta;
static int last_drv_delta = 0, last_rx_delta = 0, last_tx_delta = 0;
if (smp_processor_id() != 0)
return 0;
schedule_work(&wq_get_stats);
calculate_delta(&drv_delta, &rx_delta, &tx_delta);
len = 0;
if (netdrv_enabled && last_drv_delta != drv_delta) {
last_drv_delta = drv_delta;
netGet[len++] = netdrv_key;
netGet[len++] = drv_delta;
}
if (netrx_enabled && last_rx_delta != rx_delta) {
last_rx_delta = rx_delta;
netGet[len++] = netrx_key;
netGet[len++] = rx_delta;
}
if (nettx_enabled && last_tx_delta != tx_delta) {
last_tx_delta = tx_delta;
netGet[len++] = nettx_key;
netGet[len++] = tx_delta;
}
if (buffer)
*buffer = netGet;
return len;
}
static struct gator_interface gator_events_net_interface = {
.create_files = gator_events_net_create_files,
.start = gator_events_net_start,
.stop = gator_events_net_stop,
.read = gator_events_net_read,
};
int gator_events_net_init(void)
{
gator_net_traffic++;
netdrv_key = gator_events_get_key();
netrx_key = gator_events_get_key();
nettx_key = gator_events_get_key();
netdrv_enabled = 0;
netrx_enabled = 0;
nettx_enabled = 0;
return gator_events_install(&gator_events_net_interface);
}
gator_events_init(gator_events_net_init);