diff options
Diffstat (limited to 'driver/gator_events_net.c')
| -rw-r--r-- | driver/gator_events_net.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/driver/gator_events_net.c b/driver/gator_events_net.c new file mode 100644 index 0000000..3ca5911 --- /dev/null +++ b/driver/gator_events_net.c @@ -0,0 +1,176 @@ +/** + * 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_init(int *key) +{ + netdrv_key = *key; + *key = *key + 1; + netrx_key = *key; + *key = *key + 1; + nettx_key = *key; + *key = *key + 1; + + netdrv_enabled = 0; + netrx_enabled = 0; + nettx_enabled = 0; + + 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; + + if (raw_smp_processor_id() != 0) + return 0; + + schedule_work(&wq_get_stats); + calculate_delta(&drv_delta, &rx_delta, &tx_delta); + + len = 0; + if (netdrv_enabled) { + netGet[len++] = netdrv_key; + netGet[len++] = drv_delta; + } + + if (netrx_enabled) { + netGet[len++] = netrx_key; + netGet[len++] = rx_delta; + } + + if (nettx_enabled) { + netGet[len++] = nettx_key; + netGet[len++] = tx_delta; + } + + if (buffer) + *buffer = netGet; + + return len; +} + +int gator_events_net_install(gator_interface *gi) { + gi->create_files = gator_events_net_create_files; + gi->init = gator_events_net_init; + gi->start = gator_events_net_start; + gi->stop = gator_events_net_stop; + gi->read = gator_events_net_read; + gator_net_traffic++; + return 0; +} |