1 /**
2 * Copyright (C) ARM Limited 2010-2011. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 */
10 #include "gator.h"
11 #include <linux/netdevice.h>
13 #define NETRX 0
14 #define NETTX 1
15 #define NETDRV 2
16 #define TOTALNET (NETDRV+1)
18 static ulong netdrv_enabled;
19 static ulong netrx_enabled;
20 static ulong nettx_enabled;
21 static ulong netdrv_key;
22 static ulong netrx_key;
23 static ulong nettx_key;
24 static int rx_total, tx_total;
25 static ulong netPrev[TOTALNET];
26 static int netGet[TOTALNET * 2];
28 static void get_network_stats(struct work_struct *wsptr) {
29 int rx = 0, tx = 0;
30 struct net_device *dev;
32 for_each_netdev(&init_net, dev) {
33 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
34 const struct net_device_stats *stats = dev_get_stats(dev);
35 #else
36 struct rtnl_link_stats64 temp;
37 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
38 #endif
39 rx += stats->rx_bytes;
40 tx += stats->tx_bytes;
41 }
42 rx_total = rx;
43 tx_total = tx;
44 }
45 DECLARE_WORK(wq_get_stats, get_network_stats);
47 static void calculate_delta(int *drv, int *rx, int *tx)
48 {
49 int drv_calc, rx_calc, tx_calc;
51 drv_calc = gator_net_traffic - netPrev[NETDRV];
52 if (drv_calc > 0) {
53 netPrev[NETDRV] += drv_calc;
54 netPrev[NETTX] += drv_calc;
55 // remove tcp/ip header overhead
56 // approximation based on empirical measurement
57 netPrev[NETRX] += drv_calc / 42;
58 netPrev[NETTX] += drv_calc / 18;
59 }
61 rx_calc = (int)(rx_total - netPrev[NETRX]);
62 if (rx_calc < 0)
63 rx_calc = 0;
64 netPrev[NETRX] += rx_calc;
66 tx_calc = (int)(tx_total - netPrev[NETTX]);
67 if (tx_calc < 0)
68 tx_calc = 0;
69 netPrev[NETTX] += tx_calc;
71 *drv = drv_calc;
72 *rx = rx_calc;
73 *tx = tx_calc;
74 }
76 static int gator_events_net_create_files(struct super_block *sb, struct dentry *root)
77 {
78 struct dentry *dir;
80 dir = gatorfs_mkdir(sb, root, "Linux_net_drv");
81 if (!dir) {
82 return -1;
83 }
84 gatorfs_create_ulong(sb, dir, "enabled", &netdrv_enabled);
85 gatorfs_create_ro_ulong(sb, dir, "key", &netdrv_key);
87 dir = gatorfs_mkdir(sb, root, "Linux_net_rx");
88 if (!dir) {
89 return -1;
90 }
91 gatorfs_create_ulong(sb, dir, "enabled", &netrx_enabled);
92 gatorfs_create_ro_ulong(sb, dir, "key", &netrx_key);
94 dir = gatorfs_mkdir(sb, root, "Linux_net_tx");
95 if (!dir) {
96 return -1;
97 }
98 gatorfs_create_ulong(sb, dir, "enabled", &nettx_enabled);
99 gatorfs_create_ro_ulong(sb, dir, "key", &nettx_key);
101 return 0;
102 }
104 static int gator_events_net_init(int *key)
105 {
106 netdrv_key = *key;
107 *key = *key + 1;
108 netrx_key = *key;
109 *key = *key + 1;
110 nettx_key = *key;
111 *key = *key + 1;
113 netdrv_enabled = 0;
114 netrx_enabled = 0;
115 nettx_enabled = 0;
117 return 0;
118 }
120 static int gator_events_net_start(void)
121 {
122 get_network_stats(NULL);
123 netPrev[NETDRV] = 0;
124 netPrev[NETRX] = rx_total;
125 netPrev[NETTX] = tx_total;
126 return 0;
127 }
129 static void gator_events_net_stop(void)
130 {
131 netdrv_enabled = 0;
132 netrx_enabled = 0;
133 nettx_enabled = 0;
134 }
136 static int gator_events_net_read(int **buffer)
137 {
138 int len, drv_delta, rx_delta, tx_delta;
139 static int last_drv_delta = 0, last_rx_delta = 0, last_tx_delta = 0;
141 if (raw_smp_processor_id() != 0)
142 return 0;
144 schedule_work(&wq_get_stats);
145 calculate_delta(&drv_delta, &rx_delta, &tx_delta);
147 len = 0;
148 if (netdrv_enabled && last_drv_delta != drv_delta) {
149 last_drv_delta = drv_delta;
150 netGet[len++] = netdrv_key;
151 netGet[len++] = drv_delta;
152 }
154 if (netrx_enabled && last_rx_delta != rx_delta) {
155 last_rx_delta = rx_delta;
156 netGet[len++] = netrx_key;
157 netGet[len++] = rx_delta;
158 }
160 if (nettx_enabled && last_tx_delta != tx_delta) {
161 last_tx_delta = tx_delta;
162 netGet[len++] = nettx_key;
163 netGet[len++] = tx_delta;
164 }
166 if (buffer)
167 *buffer = netGet;
169 return len;
170 }
172 int gator_events_net_install(gator_interface *gi) {
173 gi->create_files = gator_events_net_create_files;
174 gi->init = gator_events_net_init;
175 gi->start = gator_events_net_start;
176 gi->stop = gator_events_net_stop;
177 gi->read = gator_events_net_read;
178 gator_net_traffic++;
179 return 0;
180 }