2 * arch/s390/appldata/appldata_net_sum.c
4 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
5 * Collects accumulated network statistics (Packets received/transmitted,
6 * dropped, errors, ...).
8 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
10 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
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>
23 #define MY_PRINT_NAME "appldata_net_sum" /* for debug messages, etc. */
29 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
30 * the structure version (product ID, see appldata_base.c) needs to be changed
31 * as well and all documentation and z/VM applications using it must be updated.
33 * The record layout is documented in the Linux for zSeries Device Drivers
35 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
37 static struct appldata_net_sum_data {
39 u32 sync_count_1; /* after VM collected the record data, */
40 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
41 same. If not, the record has been updated on
42 the Linux side while VM was collecting the
43 (possibly corrupt) data */
45 u32 nr_interfaces; /* nr. of network interfaces being monitored */
47 u32 padding; /* next value is 64-bit aligned, so these */
48 /* 4 byte would be padded out by compiler */
50 u64 rx_packets; /* total packets received */
51 u64 tx_packets; /* total packets transmitted */
52 u64 rx_bytes; /* total bytes received */
53 u64 tx_bytes; /* total bytes transmitted */
54 u64 rx_errors; /* bad packets received */
55 u64 tx_errors; /* packet transmit problems */
56 u64 rx_dropped; /* no space in linux buffers */
57 u64 tx_dropped; /* no space available in linux */
58 u64 collisions; /* collisions while transmitting */
59 } __attribute__((packed)) appldata_net_sum_data;
62 static inline void appldata_print_debug(struct appldata_net_sum_data *net_data)
64 P_DEBUG("--- NET - RECORD ---\n");
66 P_DEBUG("nr_interfaces = %u\n", net_data->nr_interfaces);
67 P_DEBUG("rx_packets = %8lu\n", net_data->rx_packets);
68 P_DEBUG("tx_packets = %8lu\n", net_data->tx_packets);
69 P_DEBUG("rx_bytes = %8lu\n", net_data->rx_bytes);
70 P_DEBUG("tx_bytes = %8lu\n", net_data->tx_bytes);
71 P_DEBUG("rx_errors = %8lu\n", net_data->rx_errors);
72 P_DEBUG("tx_errors = %8lu\n", net_data->tx_errors);
73 P_DEBUG("rx_dropped = %8lu\n", net_data->rx_dropped);
74 P_DEBUG("tx_dropped = %8lu\n", net_data->tx_dropped);
75 P_DEBUG("collisions = %8lu\n", net_data->collisions);
77 P_DEBUG("sync_count_1 = %u\n", net_data->sync_count_1);
78 P_DEBUG("sync_count_2 = %u\n", net_data->sync_count_2);
79 P_DEBUG("timestamp = %lX\n", net_data->timestamp);
83 * appldata_get_net_sum_data()
85 * gather accumulated network statistics
87 static void appldata_get_net_sum_data(void *data)
90 struct appldata_net_sum_data *net_data;
91 struct net_device *dev;
92 struct net_device_stats *stats;
93 unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
94 tx_errors, rx_dropped, tx_dropped, collisions;
97 net_data->sync_count_1++;
109 read_lock(&dev_base_lock);
110 for (dev = dev_base; dev != NULL; dev = dev->next) {
111 stats = dev->get_stats(dev);
115 rx_packets += stats->rx_packets;
116 tx_packets += stats->tx_packets;
117 rx_bytes += stats->rx_bytes;
118 tx_bytes += stats->tx_bytes;
119 rx_errors += stats->rx_errors;
120 tx_errors += stats->tx_errors;
121 rx_dropped += stats->rx_dropped;
122 tx_dropped += stats->tx_dropped;
123 collisions += stats->collisions;
126 read_unlock(&dev_base_lock);
127 net_data->nr_interfaces = i;
128 net_data->rx_packets = rx_packets;
129 net_data->tx_packets = tx_packets;
130 net_data->rx_bytes = rx_bytes;
131 net_data->tx_bytes = tx_bytes;
132 net_data->rx_errors = rx_errors;
133 net_data->tx_errors = tx_errors;
134 net_data->rx_dropped = rx_dropped;
135 net_data->tx_dropped = tx_dropped;
136 net_data->collisions = collisions;
138 net_data->timestamp = get_clock();
139 net_data->sync_count_2++;
140 #ifdef APPLDATA_DEBUG
141 appldata_print_debug(net_data);
146 static struct appldata_ops ops = {
147 .ctl_nr = CTL_APPLDATA_NET_SUM,
149 .record_nr = APPLDATA_RECORD_NET_SUM_ID,
150 .size = sizeof(struct appldata_net_sum_data),
151 .callback = &appldata_get_net_sum_data,
152 .data = &appldata_net_sum_data,
153 .owner = THIS_MODULE,
154 .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
159 * appldata_net_init()
161 * init data, register ops
163 static int __init appldata_net_init(void)
167 P_DEBUG("sizeof(net) = %lu\n", sizeof(struct appldata_net_sum_data));
169 rc = appldata_register_ops(&ops);
171 P_ERROR("Error registering ops, rc = %i\n", rc);
173 P_DEBUG("%s-ops registered!\n", ops.name);
179 * appldata_net_exit()
183 static void __exit appldata_net_exit(void)
185 appldata_unregister_ops(&ops);
186 P_DEBUG("%s-ops unregistered!\n", ops.name);
190 module_init(appldata_net_init);
191 module_exit(appldata_net_exit);
193 MODULE_LICENSE("GPL");
194 MODULE_AUTHOR("Gerald Schaefer");
195 MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");