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/tty.h>
39 #include <linux/init.h>
40 #include <linux/module.h>
41 #include <linux/console.h>
42 #include <linux/tty_driver.h>
43 #include <linux/moduleparam.h>
44 #include <linux/string.h>
45 #include <linux/sysrq.h>
46 #include <linux/smp.h>
47 #include <linux/netpoll.h>
49 MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");
50 MODULE_DESCRIPTION("Console driver for network interfaces");
51 MODULE_LICENSE("GPL");
53 static char config
[256];
54 module_param_string(netconsole
, config
, 256, 0);
55 MODULE_PARM_DESC(netconsole
, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n");
57 static struct netpoll np
= {
62 .remote_mac
= {0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
64 static int configured
= 0;
66 #define MAX_PRINT_CHUNK 1000
68 static void write_msg(struct console
*con
, const char *msg
, unsigned int len
)
76 local_irq_save(flags
);
78 for(left
= len
; left
; ) {
79 frag
= min(left
, MAX_PRINT_CHUNK
);
80 netpoll_send_udp(&np
, msg
, frag
);
85 local_irq_restore(flags
);
88 static struct console netconsole
= {
90 .flags
= CON_ENABLED
| CON_PRINTBUFFER
,
94 static int option_setup(char *opt
)
96 configured
= !netpoll_parse_options(&np
, opt
);
100 __setup("netconsole=", option_setup
);
102 static int init_netconsole(void)
107 option_setup(config
);
110 printk("netconsole: not configured, aborting\n");
114 err
= netpoll_setup(&np
);
118 register_console(&netconsole
);
119 printk(KERN_INFO
"netconsole: network logging started\n");
123 static void cleanup_netconsole(void)
125 unregister_console(&netconsole
);
126 netpoll_cleanup(&np
);
129 module_init(init_netconsole
);
130 module_exit(cleanup_netconsole
);
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