ia64/linux-2.6.18-xen.hg

view drivers/net/netconsole.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
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 */
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 ****************************************************************/
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>
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 = {
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;
67 #define MAX_PRINT_CHUNK 1000
69 static void write_msg(struct console *con, const char *msg, unsigned int len)
70 {
71 int frag, left;
72 unsigned long flags;
74 if (!np.dev)
75 return;
77 local_irq_save(flags);
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 }
86 local_irq_restore(flags);
87 }
89 static struct console netconsole = {
90 .name = "netcon",
91 .flags = CON_ENABLED | CON_PRINTBUFFER,
92 .write = write_msg
93 };
95 static int option_setup(char *opt)
96 {
97 configured = !netpoll_parse_options(&np, opt);
98 return 1;
99 }
101 __setup("netconsole=", option_setup);
103 static int init_netconsole(void)
104 {
105 if(strlen(config))
106 option_setup(config);
108 if(!configured) {
109 printk("netconsole: not configured, aborting\n");
110 return 0;
111 }
113 if(netpoll_setup(&np))
114 return -EINVAL;
116 register_console(&netconsole);
117 printk(KERN_INFO "netconsole: network logging started\n");
118 return 0;
119 }
121 static void cleanup_netconsole(void)
122 {
123 unregister_console(&netconsole);
124 netpoll_cleanup(&np);
125 }
127 module_init(init_netconsole);
128 module_exit(cleanup_netconsole);