1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Data gathering module for Linux-VM Monitor Stream, Stage 1. |
4 | * Collects accumulated network statistics (Packets received/transmitted, |
5 | * dropped, errors, ...). |
6 | * |
7 | * Copyright IBM Corp. 2003, 2006 |
8 | * |
9 | * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> |
14 | #include <linux/errno.h> |
15 | #include <linux/kernel_stat.h> |
16 | #include <linux/netdevice.h> |
17 | #include <net/net_namespace.h> |
18 | |
19 | #include "appldata.h" |
20 | |
21 | |
22 | /* |
23 | * Network data |
24 | * |
25 | * This is accessed as binary data by z/VM. If changes to it can't be avoided, |
26 | * the structure version (product ID, see appldata_base.c) needs to be changed |
27 | * as well and all documentation and z/VM applications using it must be updated. |
28 | */ |
29 | struct appldata_net_sum_data { |
30 | u64 timestamp; |
31 | u32 sync_count_1; /* after VM collected the record data, */ |
32 | u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the |
33 | same. If not, the record has been updated on |
34 | the Linux side while VM was collecting the |
35 | (possibly corrupt) data */ |
36 | |
37 | u32 nr_interfaces; /* nr. of network interfaces being monitored */ |
38 | |
39 | u32 padding; /* next value is 64-bit aligned, so these */ |
40 | /* 4 byte would be padded out by compiler */ |
41 | |
42 | u64 rx_packets; /* total packets received */ |
43 | u64 tx_packets; /* total packets transmitted */ |
44 | u64 rx_bytes; /* total bytes received */ |
45 | u64 tx_bytes; /* total bytes transmitted */ |
46 | u64 rx_errors; /* bad packets received */ |
47 | u64 tx_errors; /* packet transmit problems */ |
48 | u64 rx_dropped; /* no space in linux buffers */ |
49 | u64 tx_dropped; /* no space available in linux */ |
50 | u64 collisions; /* collisions while transmitting */ |
51 | } __packed; |
52 | |
53 | |
54 | /* |
55 | * appldata_get_net_sum_data() |
56 | * |
57 | * gather accumulated network statistics |
58 | */ |
59 | static void appldata_get_net_sum_data(void *data) |
60 | { |
61 | int i; |
62 | struct appldata_net_sum_data *net_data; |
63 | struct net_device *dev; |
64 | unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors, |
65 | tx_errors, rx_dropped, tx_dropped, collisions; |
66 | |
67 | net_data = data; |
68 | net_data->sync_count_1++; |
69 | |
70 | i = 0; |
71 | rx_packets = 0; |
72 | tx_packets = 0; |
73 | rx_bytes = 0; |
74 | tx_bytes = 0; |
75 | rx_errors = 0; |
76 | tx_errors = 0; |
77 | rx_dropped = 0; |
78 | tx_dropped = 0; |
79 | collisions = 0; |
80 | |
81 | rcu_read_lock(); |
82 | for_each_netdev_rcu(&init_net, dev) { |
83 | const struct rtnl_link_stats64 *stats; |
84 | struct rtnl_link_stats64 temp; |
85 | |
86 | stats = dev_get_stats(dev, storage: &temp); |
87 | rx_packets += stats->rx_packets; |
88 | tx_packets += stats->tx_packets; |
89 | rx_bytes += stats->rx_bytes; |
90 | tx_bytes += stats->tx_bytes; |
91 | rx_errors += stats->rx_errors; |
92 | tx_errors += stats->tx_errors; |
93 | rx_dropped += stats->rx_dropped; |
94 | tx_dropped += stats->tx_dropped; |
95 | collisions += stats->collisions; |
96 | i++; |
97 | } |
98 | rcu_read_unlock(); |
99 | |
100 | net_data->nr_interfaces = i; |
101 | net_data->rx_packets = rx_packets; |
102 | net_data->tx_packets = tx_packets; |
103 | net_data->rx_bytes = rx_bytes; |
104 | net_data->tx_bytes = tx_bytes; |
105 | net_data->rx_errors = rx_errors; |
106 | net_data->tx_errors = tx_errors; |
107 | net_data->rx_dropped = rx_dropped; |
108 | net_data->tx_dropped = tx_dropped; |
109 | net_data->collisions = collisions; |
110 | |
111 | net_data->timestamp = get_tod_clock(); |
112 | net_data->sync_count_2++; |
113 | } |
114 | |
115 | |
116 | static struct appldata_ops ops = { |
117 | .name = "net_sum" , |
118 | .record_nr = APPLDATA_RECORD_NET_SUM_ID, |
119 | .size = sizeof(struct appldata_net_sum_data), |
120 | .callback = &appldata_get_net_sum_data, |
121 | .owner = THIS_MODULE, |
122 | .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */ |
123 | }; |
124 | |
125 | |
126 | /* |
127 | * appldata_net_init() |
128 | * |
129 | * init data, register ops |
130 | */ |
131 | static int __init appldata_net_init(void) |
132 | { |
133 | int ret; |
134 | |
135 | ops.data = kzalloc(size: sizeof(struct appldata_net_sum_data), GFP_KERNEL); |
136 | if (!ops.data) |
137 | return -ENOMEM; |
138 | |
139 | ret = appldata_register_ops(ops: &ops); |
140 | if (ret) |
141 | kfree(objp: ops.data); |
142 | |
143 | return ret; |
144 | } |
145 | |
146 | /* |
147 | * appldata_net_exit() |
148 | * |
149 | * unregister ops |
150 | */ |
151 | static void __exit appldata_net_exit(void) |
152 | { |
153 | appldata_unregister_ops(ops: &ops); |
154 | kfree(objp: ops.data); |
155 | } |
156 | |
157 | |
158 | module_init(appldata_net_init); |
159 | module_exit(appldata_net_exit); |
160 | |
161 | MODULE_LICENSE("GPL" ); |
162 | MODULE_AUTHOR("Gerald Schaefer" ); |
163 | MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics" ); |
164 | |