diff options
Diffstat (limited to 'drivers/net/netconsole.c')
| -rw-r--r-- | drivers/net/netconsole.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c new file mode 100644 index 000000000000..edd1b5306b16 --- /dev/null +++ b/drivers/net/netconsole.c @@ -0,0 +1,127 @@ +/* + * linux/drivers/net/netconsole.c + * + * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> + * + * This file contains the implementation of an IRQ-safe, crash-safe + * kernel console implementation that outputs kernel messages to the + * network. + * + * Modification history: + * + * 2001-09-17 started by Ingo Molnar. + * 2003-08-11 2.6 port by Matt Mackall + * simplified options + * generic card hooks + * works non-modular + * 2003-09-07 rewritten with netpoll api + */ + +/**************************************************************** + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + ****************************************************************/ + +#include <linux/mm.h> +#include <linux/tty.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/console.h> +#include <linux/tty_driver.h> +#include <linux/moduleparam.h> +#include <linux/string.h> +#include <linux/sysrq.h> +#include <linux/smp.h> +#include <linux/netpoll.h> + +MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>"); +MODULE_DESCRIPTION("Console driver for network interfaces"); +MODULE_LICENSE("GPL"); + +static char config[256]; +module_param_string(netconsole, config, 256, 0); +MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]\n"); + +static struct netpoll np = { + .name = "netconsole", + .dev_name = "eth0", + .local_port = 6665, + .remote_port = 6666, + .remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, + .drop = netpoll_queue, +}; +static int configured = 0; + +#define MAX_PRINT_CHUNK 1000 + +static void write_msg(struct console *con, const char *msg, unsigned int len) +{ + int frag, left; + unsigned long flags; + + if (!np.dev) + return; + + local_irq_save(flags); + + for(left = len; left; ) { + frag = min(left, MAX_PRINT_CHUNK); + netpoll_send_udp(&np, msg, frag); + msg += frag; + left -= frag; + } + + local_irq_restore(flags); +} + +static struct console netconsole = { + .flags = CON_ENABLED | CON_PRINTBUFFER, + .write = write_msg +}; + +static int option_setup(char *opt) +{ + configured = !netpoll_parse_options(&np, opt); + return 0; +} + +__setup("netconsole=", option_setup); + +static int init_netconsole(void) +{ + if(strlen(config)) + option_setup(config); + + if(!configured) { + printk("netconsole: not configured, aborting\n"); + return -EINVAL; + } + + if(netpoll_setup(&np)) + return -EINVAL; + + register_console(&netconsole); + printk(KERN_INFO "netconsole: network logging started\n"); + return 0; +} + +static void cleanup_netconsole(void) +{ + unregister_console(&netconsole); + netpoll_cleanup(&np); +} + +module_init(init_netconsole); +module_exit(cleanup_netconsole); |