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