1 /*
2 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
3 * Collects accumulated network statistics (Packets received/transmitted,
4 * dropped, errors, ...).
5 *
6 * Copyright IBM Corp. 2003, 2006
7 *
8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
9 */
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/errno.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/netdevice.h>
16 #include <net/net_namespace.h>
17
18 #include "appldata.h"
19
20
21 /*
22 * Network data
23 *
24 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
25 * the structure version (product ID, see appldata_base.c) needs to be changed
26 * as well and all documentation and z/VM applications using it must be updated.
27 *
28 * The record layout is documented in the Linux for zSeries Device Drivers
29 * book:
30 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
31 */
32 struct appldata_net_sum_data {
33 u64 timestamp;
34 u32 sync_count_1; /* after VM collected the record data, */
35 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
36 same. If not, the record has been updated on
37 the Linux side while VM was collecting the
38 (possibly corrupt) data */
39
40 u32 nr_interfaces; /* nr. of network interfaces being monitored */
41
42 u32 padding; /* next value is 64-bit aligned, so these */
43 /* 4 byte would be padded out by compiler */
44
45 u64 rx_packets; /* total packets received */
46 u64 tx_packets; /* total packets transmitted */
47 u64 rx_bytes; /* total bytes received */
48 u64 tx_bytes; /* total bytes transmitted */
49 u64 rx_errors; /* bad packets received */
50 u64 tx_errors; /* packet transmit problems */
51 u64 rx_dropped; /* no space in linux buffers */
52 u64 tx_dropped; /* no space available in linux */
53 u64 collisions; /* collisions while transmitting */
54 } __packed;
55
56
57 /*
58 * appldata_get_net_sum_data()
59 *
60 * gather accumulated network statistics
61 */
appldata_get_net_sum_data(void * data)62 static void appldata_get_net_sum_data(void *data)
63 {
64 int i;
65 struct appldata_net_sum_data *net_data;
66 struct net_device *dev;
67 unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
68 tx_errors, rx_dropped, tx_dropped, collisions;
69
70 net_data = data;
71 net_data->sync_count_1++;
72
73 i = 0;
74 rx_packets = 0;
75 tx_packets = 0;
76 rx_bytes = 0;
77 tx_bytes = 0;
78 rx_errors = 0;
79 tx_errors = 0;
80 rx_dropped = 0;
81 tx_dropped = 0;
82 collisions = 0;
83
84 rcu_read_lock();
85 for_each_netdev_rcu(&init_net, dev) {
86 const struct rtnl_link_stats64 *stats;
87 struct rtnl_link_stats64 temp;
88
89 stats = dev_get_stats(dev, &temp);
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 rcu_read_unlock();
102
103 net_data->nr_interfaces = i;
104 net_data->rx_packets = rx_packets;
105 net_data->tx_packets = tx_packets;
106 net_data->rx_bytes = rx_bytes;
107 net_data->tx_bytes = tx_bytes;
108 net_data->rx_errors = rx_errors;
109 net_data->tx_errors = tx_errors;
110 net_data->rx_dropped = rx_dropped;
111 net_data->tx_dropped = tx_dropped;
112 net_data->collisions = collisions;
113
114 net_data->timestamp = get_tod_clock();
115 net_data->sync_count_2++;
116 }
117
118
119 static struct appldata_ops ops = {
120 .name = "net_sum",
121 .record_nr = APPLDATA_RECORD_NET_SUM_ID,
122 .size = sizeof(struct appldata_net_sum_data),
123 .callback = &appldata_get_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 */
appldata_net_init(void)134 static int __init appldata_net_init(void)
135 {
136 int ret;
137
138 ops.data = kzalloc(sizeof(struct appldata_net_sum_data), GFP_KERNEL);
139 if (!ops.data)
140 return -ENOMEM;
141
142 ret = appldata_register_ops(&ops);
143 if (ret)
144 kfree(ops.data);
145
146 return ret;
147 }
148
149 /*
150 * appldata_net_exit()
151 *
152 * unregister ops
153 */
appldata_net_exit(void)154 static void __exit appldata_net_exit(void)
155 {
156 appldata_unregister_ops(&ops);
157 kfree(ops.data);
158 }
159
160
161 module_init(appldata_net_init);
162 module_exit(appldata_net_exit);
163
164 MODULE_LICENSE("GPL");
165 MODULE_AUTHOR("Gerald Schaefer");
166 MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");
167