aboutsummaryrefslogtreecommitdiffstats
path: root/arch/s390/appldata/appldata_net_sum.c
blob: f02e89ce4df1096cc95deabacae29486734648c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
 * 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) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/netdevice.h>
#include <net/net_namespace.h>

#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
 */
static 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 */
} __attribute__((packed)) appldata_net_sum_data;


/*
 * 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;

	rcu_read_lock();
	for_each_netdev_rcu(&init_net, dev) {
		struct rtnl_link_stats64 temp;
		const struct net_device_stats *stats = dev_get_stats(dev, &temp);

		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++;
	}
	rcu_read_unlock();

	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,
	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
};


/*
 * appldata_net_init()
 *
 * init data, register ops
 */
static int __init appldata_net_init(void)
{
	return appldata_register_ops(&ops);
}

/*
 * 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");

Privacy Policy