2 * linux/drivers/net/netconsole.c
4 * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
6 * This file contains the implementation of an IRQ-safe, crash-safe
7 * kernel console implementation that outputs kernel messages to the
10 * Modification history:
12 * 2001-09-17 started by Ingo Molnar.
13 * 2003-08-11 2.6 port by Matt Mackall
17 * 2003-09-07 rewritten with netpoll api
20 /****************************************************************
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2, or (at your option)
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 ****************************************************************/
38 #include <linux/init.h>
39 #include <linux/module.h>
40 #include <linux/console.h>
41 #include <linux/moduleparam.h>
42 #include <linux/string.h>
43 #include <linux/netpoll.h>
45 MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");
46 MODULE_DESCRIPTION("Console driver for network interfaces");
47 MODULE_LICENSE("GPL");
49 #define MAX_PARAM_LENGTH 256
50 #define MAX_PRINT_CHUNK 1000
52 static char config[MAX_PARAM_LENGTH];
53 module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);
54 MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n");
57 static int __init option_setup(char *opt)
59 strlcpy(config, opt, MAX_PARAM_LENGTH);
62 __setup("netconsole=", option_setup);
66 * struct netconsole_target - Represents a configured netconsole target.
67 * @np: The netpoll structure for this target.
69 struct netconsole_target {
73 static struct netconsole_target default_target = {
79 .remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
83 /* Handle network interface device notifications */
84 static int netconsole_netdev_event(struct notifier_block *this,
88 struct net_device *dev = ptr;
89 struct netconsole_target *nt = &default_target;
91 if (nt->np.dev == dev) {
93 case NETDEV_CHANGEADDR:
94 memcpy(nt->np.local_mac, dev->dev_addr, ETH_ALEN);
97 case NETDEV_CHANGENAME:
98 strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ);
106 static struct notifier_block netconsole_netdev_notifier = {
107 .notifier_call = netconsole_netdev_event,
110 static void write_msg(struct console *con, const char *msg, unsigned int len)
114 struct netconsole_target *nt = &default_target;
116 if (netif_running(nt->np.dev)) {
117 local_irq_save(flags);
118 for (left = len; left;) {
119 frag = min(left, MAX_PRINT_CHUNK);
120 netpoll_send_udp(&nt->np, msg, frag);
124 local_irq_restore(flags);
128 static struct console netconsole = {
130 .flags = CON_ENABLED | CON_PRINTBUFFER,
134 static int __init init_netconsole(void)
137 struct netconsole_target *nt = &default_target;
139 if (!strnlen(config, MAX_PARAM_LENGTH)) {
140 printk(KERN_INFO "netconsole: not configured, aborting\n");
144 err = netpoll_parse_options(&nt->np, config);
148 err = netpoll_setup(&nt->np);
152 err = register_netdevice_notifier(&netconsole_netdev_notifier);
156 register_console(&netconsole);
157 printk(KERN_INFO "netconsole: network logging started\n");
163 static void __exit cleanup_netconsole(void)
165 struct netconsole_target *nt = &default_target;
167 unregister_console(&netconsole);
168 unregister_netdevice_notifier(&netconsole_netdev_notifier);
169 netpoll_cleanup(&nt->np);
172 module_init(init_netconsole);
173 module_exit(cleanup_netconsole);