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1da177e4 LT |
1 | /* |
2 | * linux/drivers/net/netconsole.c | |
3 | * | |
4 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> | |
5 | * | |
6 | * This file contains the implementation of an IRQ-safe, crash-safe | |
7 | * kernel console implementation that outputs kernel messages to the | |
8 | * network. | |
9 | * | |
10 | * Modification history: | |
11 | * | |
12 | * 2001-09-17 started by Ingo Molnar. | |
13 | * 2003-08-11 2.6 port by Matt Mackall | |
14 | * simplified options | |
15 | * generic card hooks | |
16 | * works non-modular | |
17 | * 2003-09-07 rewritten with netpoll api | |
18 | */ | |
19 | ||
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) | |
24 | * any later version. | |
25 | * | |
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. | |
30 | * | |
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. | |
34 | * | |
35 | ****************************************************************/ | |
36 | ||
37 | #include <linux/mm.h> | |
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> | |
48 | ||
49 | MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); | |
50 | MODULE_DESCRIPTION("Console driver for network interfaces"); | |
51 | MODULE_LICENSE("GPL"); | |
52 | ||
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"); | |
56 | ||
57 | static struct netpoll np = { | |
58 | .name = "netconsole", | |
59 | .dev_name = "eth0", | |
60 | .local_port = 6665, | |
61 | .remote_port = 6666, | |
62 | .remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, | |
63 | .drop = netpoll_queue, | |
64 | }; | |
65 | static int configured = 0; | |
66 | ||
67 | #define MAX_PRINT_CHUNK 1000 | |
68 | ||
69 | static void write_msg(struct console *con, const char *msg, unsigned int len) | |
70 | { | |
71 | int frag, left; | |
72 | unsigned long flags; | |
73 | ||
74 | if (!np.dev) | |
75 | return; | |
76 | ||
77 | local_irq_save(flags); | |
78 | ||
79 | for(left = len; left; ) { | |
80 | frag = min(left, MAX_PRINT_CHUNK); | |
81 | netpoll_send_udp(&np, msg, frag); | |
82 | msg += frag; | |
83 | left -= frag; | |
84 | } | |
85 | ||
86 | local_irq_restore(flags); | |
87 | } | |
88 | ||
89 | static struct console netconsole = { | |
90 | .flags = CON_ENABLED | CON_PRINTBUFFER, | |
91 | .write = write_msg | |
92 | }; | |
93 | ||
94 | static int option_setup(char *opt) | |
95 | { | |
96 | configured = !netpoll_parse_options(&np, opt); | |
9b41046c | 97 | return 1; |
1da177e4 LT |
98 | } |
99 | ||
100 | __setup("netconsole=", option_setup); | |
101 | ||
102 | static int init_netconsole(void) | |
103 | { | |
104 | if(strlen(config)) | |
105 | option_setup(config); | |
106 | ||
107 | if(!configured) { | |
108 | printk("netconsole: not configured, aborting\n"); | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | if(netpoll_setup(&np)) | |
113 | return -EINVAL; | |
114 | ||
115 | register_console(&netconsole); | |
116 | printk(KERN_INFO "netconsole: network logging started\n"); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static void cleanup_netconsole(void) | |
121 | { | |
122 | unregister_console(&netconsole); | |
123 | netpoll_cleanup(&np); | |
124 | } | |
125 | ||
126 | module_init(init_netconsole); | |
127 | module_exit(cleanup_netconsole); |