1 /*
2  * arch/s390/appldata/appldata_net_sum.c
3  *
4  * Data gathering module for Linux-VM Monitor Stream, Stage 1.
5  * Collects accumulated network statistics (Packets received/transmitted,
6  * dropped, errors, ...).
7  *
8  * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
9  *
10  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
11  */
12 
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/errno.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/netdevice.h>
18 #include <net/net_namespace.h>
19 
20 #include "appldata.h"
21 
22 
23 /*
24  * Network data
25  *
26  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
27  * the structure version (product ID, see appldata_base.c) needs to be changed
28  * as well and all documentation and z/VM applications using it must be updated.
29  *
30  * The record layout is documented in the Linux for zSeries Device Drivers
31  * book:
32  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
33  */
34 static struct appldata_net_sum_data {
35 	u64 timestamp;
36 	u32 sync_count_1;	/* after VM collected the record data, */
37 	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
38 				   same. If not, the record has been updated on
39 				   the Linux side while VM was collecting the
40 				   (possibly corrupt) data */
41 
42 	u32 nr_interfaces;	/* nr. of network interfaces being monitored */
43 
44 	u32 padding;		/* next value is 64-bit aligned, so these */
45 				/* 4 byte would be padded out by compiler */
46 
47 	u64 rx_packets;		/* total packets received        */
48 	u64 tx_packets;		/* total packets transmitted     */
49 	u64 rx_bytes;		/* total bytes received          */
50 	u64 tx_bytes;		/* total bytes transmitted       */
51 	u64 rx_errors;		/* bad packets received          */
52 	u64 tx_errors;		/* packet transmit problems      */
53 	u64 rx_dropped;		/* no space in linux buffers     */
54 	u64 tx_dropped;		/* no space available in linux   */
55 	u64 collisions;		/* collisions while transmitting */
56 } __attribute__((packed)) appldata_net_sum_data;
57 
58 
59 /*
60  * appldata_get_net_sum_data()
61  *
62  * gather accumulated network statistics
63  */
64 static void appldata_get_net_sum_data(void *data)
65 {
66 	int i;
67 	struct appldata_net_sum_data *net_data;
68 	struct net_device *dev;
69 	unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
70 			tx_errors, rx_dropped, tx_dropped, collisions;
71 
72 	net_data = data;
73 	net_data->sync_count_1++;
74 
75 	i = 0;
76 	rx_packets = 0;
77 	tx_packets = 0;
78 	rx_bytes   = 0;
79 	tx_bytes   = 0;
80 	rx_errors  = 0;
81 	tx_errors  = 0;
82 	rx_dropped = 0;
83 	tx_dropped = 0;
84 	collisions = 0;
85 
86 	rcu_read_lock();
87 	for_each_netdev_rcu(&init_net, dev) {
88 		const struct rtnl_link_stats64 *stats;
89 		struct rtnl_link_stats64 temp;
90 
91 		stats = dev_get_stats(dev, &temp);
92 		rx_packets += stats->rx_packets;
93 		tx_packets += stats->tx_packets;
94 		rx_bytes   += stats->rx_bytes;
95 		tx_bytes   += stats->tx_bytes;
96 		rx_errors  += stats->rx_errors;
97 		tx_errors  += stats->tx_errors;
98 		rx_dropped += stats->rx_dropped;
99 		tx_dropped += stats->tx_dropped;
100 		collisions += stats->collisions;
101 		i++;
102 	}
103 	rcu_read_unlock();
104 
105 	net_data->nr_interfaces = i;
106 	net_data->rx_packets = rx_packets;
107 	net_data->tx_packets = tx_packets;
108 	net_data->rx_bytes   = rx_bytes;
109 	net_data->tx_bytes   = tx_bytes;
110 	net_data->rx_errors  = rx_errors;
111 	net_data->tx_errors  = tx_errors;
112 	net_data->rx_dropped = rx_dropped;
113 	net_data->tx_dropped = tx_dropped;
114 	net_data->collisions = collisions;
115 
116 	net_data->timestamp = get_clock();
117 	net_data->sync_count_2++;
118 }
119 
120 
121 static struct appldata_ops ops = {
122 	.name	   = "net_sum",
123 	.record_nr = APPLDATA_RECORD_NET_SUM_ID,
124 	.size	   = sizeof(struct appldata_net_sum_data),
125 	.callback  = &appldata_get_net_sum_data,
126 	.data      = &appldata_net_sum_data,
127 	.owner     = THIS_MODULE,
128 	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
129 };
130 
131 
132 /*
133  * appldata_net_init()
134  *
135  * init data, register ops
136  */
137 static int __init appldata_net_init(void)
138 {
139 	return appldata_register_ops(&ops);
140 }
141 
142 /*
143  * appldata_net_exit()
144  *
145  * unregister ops
146  */
147 static void __exit appldata_net_exit(void)
148 {
149 	appldata_unregister_ops(&ops);
150 }
151 
152 
153 module_init(appldata_net_init);
154 module_exit(appldata_net_exit);
155 
156 MODULE_LICENSE("GPL");
157 MODULE_AUTHOR("Gerald Schaefer");
158 MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");
159