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
20#include "appldata.h"
21
22
23#define MY_PRINT_NAME	"appldata_net_sum"	/* for debug messages, etc. */
24
25
26/*
27 * Network data
28 *
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.
32 *
33 * The record layout is documented in the Linux for zSeries Device Drivers
34 * book:
35 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
36 */
37static struct appldata_net_sum_data {
38	u64 timestamp;
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 */
44
45	u32 nr_interfaces;	/* nr. of network interfaces being monitored */
46
47	u32 padding;		/* next value is 64-bit aligned, so these */
48				/* 4 byte would be padded out by compiler */
49
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;
60
61
62static inline void appldata_print_debug(struct appldata_net_sum_data *net_data)
63{
64	P_DEBUG("--- NET - RECORD ---\n");
65
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);
76
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);
80}
81
82/*
83 * appldata_get_net_sum_data()
84 *
85 * gather accumulated network statistics
86 */
87static void appldata_get_net_sum_data(void *data)
88{
89	int i;
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;
95
96	net_data = data;
97	net_data->sync_count_1++;
98
99	i = 0;
100	rx_packets = 0;
101	tx_packets = 0;
102	rx_bytes   = 0;
103	tx_bytes   = 0;
104	rx_errors  = 0;
105	tx_errors  = 0;
106	rx_dropped = 0;
107	tx_dropped = 0;
108	collisions = 0;
109	read_lock(&dev_base_lock);
110	for_each_netdev(dev) {
111		stats = dev->get_stats(dev);
112		rx_packets += stats->rx_packets;
113		tx_packets += stats->tx_packets;
114		rx_bytes   += stats->rx_bytes;
115		tx_bytes   += stats->tx_bytes;
116		rx_errors  += stats->rx_errors;
117		tx_errors  += stats->tx_errors;
118		rx_dropped += stats->rx_dropped;
119		tx_dropped += stats->tx_dropped;
120		collisions += stats->collisions;
121		i++;
122	}
123	read_unlock(&dev_base_lock);
124	net_data->nr_interfaces = i;
125	net_data->rx_packets = rx_packets;
126	net_data->tx_packets = tx_packets;
127	net_data->rx_bytes   = rx_bytes;
128	net_data->tx_bytes   = tx_bytes;
129	net_data->rx_errors  = rx_errors;
130	net_data->tx_errors  = tx_errors;
131	net_data->rx_dropped = rx_dropped;
132	net_data->tx_dropped = tx_dropped;
133	net_data->collisions = collisions;
134
135	net_data->timestamp = get_clock();
136	net_data->sync_count_2++;
137#ifdef APPLDATA_DEBUG
138	appldata_print_debug(net_data);
139#endif
140}
141
142
143static struct appldata_ops ops = {
144	.ctl_nr    = CTL_APPLDATA_NET_SUM,
145	.name	   = "net_sum",
146	.record_nr = APPLDATA_RECORD_NET_SUM_ID,
147	.size	   = sizeof(struct appldata_net_sum_data),
148	.callback  = &appldata_get_net_sum_data,
149	.data      = &appldata_net_sum_data,
150	.owner     = THIS_MODULE,
151	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
152};
153
154
155/*
156 * appldata_net_init()
157 *
158 * init data, register ops
159 */
160static int __init appldata_net_init(void)
161{
162	int rc;
163
164	P_DEBUG("sizeof(net) = %lu\n", sizeof(struct appldata_net_sum_data));
165
166	rc = appldata_register_ops(&ops);
167	if (rc != 0) {
168		P_ERROR("Error registering ops, rc = %i\n", rc);
169	} else {
170		P_DEBUG("%s-ops registered!\n", ops.name);
171	}
172	return rc;
173}
174
175/*
176 * appldata_net_exit()
177 *
178 * unregister ops
179 */
180static void __exit appldata_net_exit(void)
181{
182	appldata_unregister_ops(&ops);
183	P_DEBUG("%s-ops unregistered!\n", ops.name);
184}
185
186
187module_init(appldata_net_init);
188module_exit(appldata_net_exit);
189
190MODULE_LICENSE("GPL");
191MODULE_AUTHOR("Gerald Schaefer");
192MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");
193