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