Hand merge netpoll into latest upstream.

Documentation/networking/netconsole.txt

+
+started by Ingo Molnar <mingo@redhat.com>, 2001.09.17
+2.6 port and netpoll api by Matt Mackall <mpm@selenic.com>, Sep 9 2003
+
+Please send bug reports to Matt Mackall <mpm@selenic.com>
+
+This module logs kernel printk messages over UDP allowing debugging of
+problem where disk logging fails and serial consoles are impractical.
+
+It can be used either built-in or as a module. As a built-in,
+netconsole initializes immediately after NIC cards and will bring up
+the specified interface as soon as possible. While this doesn't allow
+capture of early kernel panics, it does capture most of the boot
+process.
+
+It takes a string configuration parameter "netconsole" in the
+following format:
+
+ netconsole=[src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
+
+   where
+        src-port      source for UDP packets (defaults to 6665)
+        src-ip        source IP to use (interface address)
+        dev           network interface (eth0)
+        tgt-port      port for logging agent (6666)
+        tgt-ip        IP address for logging agent
+        tgt-macaddr   ethernet MAC address for logging agent (broadcast)
+
+Examples:
+
+ linux netconsole=4444@10.0.0.1/eth1,9353@10.0.0.2/12:34:56:78:9a:bc
+
+  or
+
+ insmod netconsole netconsole=@/,@10.0.0.2/
+
+Built-in netconsole starts immediately after the TCP stack is
+initialized and attempts to bring up the supplied dev at the supplied
+address.
+
+The remote host can run either 'netcat -u -l -p <port>' or syslogd.
+
+WARNING: the default target ethernet setting uses the broadcast
+ethernet address to send packets, which can cause increased load on
+other systems on the same ethernet segment.
+
+NOTE: the network device (eth1 in the above case) can run any kind
+of other network traffic, netconsole is not intrusive. Netconsole
+might cause slight delays in other traffic if the volume of kernel
+messages is high, but should have no other impact.
+
+Netconsole was designed to be as instantaneous as possible, to
+enable the logging of even the most critical kernel bugs. It works
+from IRQ contexts as well, and does not enable interrupts while
+sending packets. Due to these unique needs, configuration can not
+be more automatic, and some fundamental limitations will remain:
+only IP networks, UDP packets and ethernet devices are supported.

drivers/net/3c503.c

@@ -337,6 +337,9 @@ el2_probe1(struct net_device *dev, int ioaddr)
     dev->open = &el2_open;
     dev->stop = &el2_close;
     dev->ethtool_ops = &netdev_ethtool_ops;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+    dev->poll_controller = ei_poll;
+#endif
 
     if (dev->mem_start)
 	printk("%s: %s - %dkB RAM, 8kB shared mem window at %#6lx-%#6lx.\n",

drivers/net/3c59x.c

@@ -920,6 +920,18 @@ static struct net_device *compaq_net_device;
 
 static int vortex_cards_found;
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void poll_vortex(struct net_device *dev)
+{
+	struct vortex_private *vp = (struct vortex_private *)dev->priv;
+	unsigned long flags;
+	local_save_flags(flags);
+	local_irq_disable();
+	(vp->full_bus_master_rx ? boomerang_interrupt:vortex_interrupt)(dev->irq,dev,NULL);
+	local_irq_restore(flags);
+} 
+#endif
+
 #ifdef CONFIG_PM
 
 static int vortex_suspend (struct pci_dev *pdev, u32 state)
@@ -1450,6 +1462,9 @@ static int __devinit vortex_probe1(struct device *gendev,
 	dev->set_multicast_list = set_rx_mode;
 	dev->tx_timeout = vortex_tx_timeout;
 	dev->watchdog_timeo = (watchdog * HZ) / 1000;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = poll_vortex; 
+#endif
 	if (pdev) {
 		vp->pm_state_valid = 1;
  		pci_save_state(VORTEX_PCI(vp), vp->power_state);

drivers/net/8390.c

@@ -516,6 +516,15 @@ irqreturn_t ei_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 	return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+void ei_poll(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	ei_interrupt(dev->irq, dev, NULL);
+	enable_irq(dev->irq);
+}
+#endif
+
 /**
  * ei_tx_err - handle transmitter error
  * @dev: network device which threw the exception
@@ -1124,6 +1133,9 @@ static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
 EXPORT_SYMBOL(ei_open);
 EXPORT_SYMBOL(ei_close);
 EXPORT_SYMBOL(ei_interrupt);
+#ifdef CONFIG_NET_POLL_CONTROLLER
+EXPORT_SYMBOL(ei_poll);
+#endif
 EXPORT_SYMBOL(ei_tx_timeout);
 EXPORT_SYMBOL(NS8390_init);
 EXPORT_SYMBOL(__alloc_ei_netdev);

drivers/net/8390.h

@@ -39,6 +39,10 @@ extern int ei_debug;
 #define ei_debug 1
 #endif
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+extern void ei_poll(struct net_device *dev);
+#endif
+
 extern void NS8390_init(struct net_device *dev, int startp);
 extern int ei_open(struct net_device *dev);
 extern int ei_close(struct net_device *dev);

drivers/net/Kconfig

@@ -2476,6 +2476,13 @@ config SHAPER
 	  To compile this driver as a module, choose M here: the module
 	  will be called shaper.  If unsure, say N.
 
+config NETCONSOLE
+	tristate "Network console logging support (EXPERIMENTAL)"
+	depends on NETDEVICES && EXPERIMENTAL
+	---help---
+	If you want to log kernel messages over the network, enable this.
+	See Documentation/networking/netconsole.txt for details.
+
 source "drivers/net/wan/Kconfig"
 
 source "drivers/net/pcmcia/Kconfig"

drivers/net/Makefile

@@ -188,3 +188,4 @@ obj-$(CONFIG_NET_TULIP) += tulip/
 obj-$(CONFIG_HAMRADIO) += hamradio/
 obj-$(CONFIG_IRDA) += irda/
 
+obj-$(CONFIG_NETCONSOLE) += netconsole.o

drivers/net/ac3200.c

@@ -276,6 +276,9 @@ static int __init ac_probe1(int ioaddr, struct net_device *dev)
 
 	dev->open = &ac_open;
 	dev->stop = &ac_close_card;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 	return 0;
 out1:

drivers/net/amd8111e.c

@@ -1153,6 +1153,17 @@ static irqreturn_t amd8111e_interrupt(int irq, void *dev_id, struct pt_regs *reg
 	return IRQ_RETVAL(handled);
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void amd8111e_poll(struct net_device *dev)
+{ 
+	unsigned long flags;
+	local_save_flags(flags); 
+	local_irq_disable();
+	amd8111e_interrupt(0, dev, NULL);
+	local_irq_restore(flags); 
+} 
+#endif
+
 /*
 This function closes the network interface and updates the statistics so that most recent statistics will be available after the interface is down.
 */
@@ -1884,6 +1895,9 @@ static int __devinit amd8111e_probe_one(struct pci_dev *pdev,
 	dev->irq =pdev->irq;
 	dev->tx_timeout = amd8111e_tx_timeout; 
 	dev->watchdog_timeo = AMD8111E_TX_TIMEOUT; 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = amd8111e_poll; 
+#endif
 
 #if AMD8111E_VLAN_TAG_USED
 	dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;

drivers/net/apne.c

@@ -333,6 +333,9 @@ static int __init apne_probe1(struct net_device *dev, int ioaddr)
     ei_status.get_8390_hdr = &apne_get_8390_hdr;
     dev->open = &apne_open;
     dev->stop = &apne_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+    dev->poll_controller = ei_poll;
+#endif
     NS8390_init(dev, 0);
 
     pcmcia_ack_int(pcmcia_get_intreq());		/* ack PCMCIA int req */

drivers/net/e2100.c

@@ -269,6 +269,9 @@ static int __init e21_probe1(struct net_device *dev, int ioaddr)
 	ei_status.get_8390_hdr = &e21_get_8390_hdr;
 	dev->open = &e21_open;
 	dev->stop = &e21_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 
 	return 0;

drivers/net/eepro100.c

@@ -542,6 +542,7 @@ static int speedo_start_xmit(struct sk_buff *skb, struct net_device *dev);
 static void speedo_refill_rx_buffers(struct net_device *dev, int force);
 static int speedo_rx(struct net_device *dev);
 static void speedo_tx_buffer_gc(struct net_device *dev);
+static void poll_speedo (struct net_device *dev);
 static irqreturn_t speedo_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
 static int speedo_close(struct net_device *dev);
 static struct net_device_stats *speedo_get_stats(struct net_device *dev);
@@ -885,6 +886,9 @@ static int __devinit speedo_found1(struct pci_dev *pdev,
 	dev->get_stats = &speedo_get_stats;
 	dev->set_multicast_list = &set_rx_mode;
 	dev->do_ioctl = &speedo_ioctl;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = &poll_speedo;
+#endif
 
 	if (register_netdevice(dev))
 		goto err_free_unlock;
@@ -1675,6 +1679,23 @@ static irqreturn_t speedo_interrupt(int irq, void *dev_instance, struct pt_regs
 	return IRQ_RETVAL(handled);
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+
+static void poll_speedo (struct net_device *dev)
+{
+	/* disable_irq is not very nice, but with the funny lockless design
+	   we have no other choice. */
+	disable_irq(dev->irq);
+	speedo_interrupt (dev->irq, dev, NULL);
+	enable_irq(dev->irq);
+}
+#endif
+
 static inline struct RxFD *speedo_rx_alloc(struct net_device *dev, int entry)
 {
 	struct speedo_private *sp = (struct speedo_private *)dev->priv;

drivers/net/es3210.c

@@ -298,6 +298,9 @@ static int __init es_probe1(struct net_device *dev, int ioaddr)
 
 	dev->open = &es_open;
 	dev->stop = &es_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 	return 0;
 out1:

drivers/net/hp-plus.c

@@ -236,6 +236,9 @@ static int __init hpp_probe1(struct net_device *dev, int ioaddr)
 
 	dev->open = &hpp_open;
 	dev->stop = &hpp_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 
 	ei_status.name = name;
 	ei_status.word16 = 0;		/* Agggghhhhh! Debug time: 2 days! */

drivers/net/hp.c

@@ -207,6 +207,9 @@ static int __init hp_probe1(struct net_device *dev, int ioaddr)
 	dev->base_addr = ioaddr + NIC_OFFSET;
 	dev->open = &hp_open;
 	dev->stop = &hp_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 
 	ei_status.name = name;
 	ei_status.word16 = wordmode;

drivers/net/hydra.c

@@ -138,6 +138,9 @@ static int __init hydra_init(unsigned long board)
     ei_status.reg_offset = hydra_offsets;
     dev->open = &hydra_open;
     dev->stop = &hydra_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+    dev->poll_controller = ei_poll;
+#endif
 #ifdef MODULE
     ei_status.priv = (unsigned long)root_hydra_dev;
     root_hydra_dev = dev;

drivers/net/lne390.c

@@ -299,6 +299,9 @@ static int __init lne390_probe1(struct net_device *dev, int ioaddr)
 
 	dev->open = &lne390_open;
 	dev->stop = &lne390_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 	return 0;
 cleanup:

drivers/net/mac8390.c

@@ -442,6 +442,9 @@ static int __init mac8390_initdev(struct net_device * dev, struct nubus_dev * nd
 	/* Now fill in our stuff */
 	dev->open = &mac8390_open;
 	dev->stop = &mac8390_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 
 	/* GAR, ei_status is actually a macro even though it looks global */
 	ei_status.name = cardname[type];

drivers/net/ne.c

@@ -496,6 +496,9 @@ static int __init ne_probe1(struct net_device *dev, int ioaddr)
 	ei_status.priv = 0;
 	dev->open = &ne_open;
 	dev->stop = &ne_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 	return 0;
 

drivers/net/ne2.c

@@ -509,6 +509,9 @@ static int __init ne2_probe1(struct net_device *dev, int slot)
 	
 	dev->open = &ne_open;
 	dev->stop = &ne_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 	return 0;
 out:

drivers/net/ne2k-pci.c

@@ -359,6 +359,9 @@ static int __devinit ne2k_pci_init_one (struct pci_dev *pdev,
 	dev->open = &ne2k_pci_open;
 	dev->stop = &ne2k_pci_close;
 	dev->ethtool_ops = &ne2k_pci_ethtool_ops;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 
 	i = register_netdev(dev);

drivers/net/ne2k_cbus.c

@@ -534,6 +534,9 @@ static int __init ne_probe1(struct net_device *dev, int ioaddr)
 	ei_status.priv = 0;
 	dev->open = &ne_open;
 	dev->stop = &ne_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 	return 0;
 

drivers/net/ne3210.c

@@ -205,6 +205,9 @@ static int __init ne3210_eisa_probe (struct device *device)
 
 	dev->open = &ne3210_open;
 	dev->stop = &ne3210_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	dev->if_port = ifmap_val[port_index];
 
 	if ((retval = register_netdev (dev)))

drivers/net/netconsole.c

+/*
+ *  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/module.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},
+};
+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);

drivers/net/oaknet.c

@@ -192,6 +192,9 @@ static int __init oaknet_init(void)
 
 	dev->open = oaknet_open;
 	dev->stop = oaknet_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 
 	NS8390_init(dev, FALSE);
 	ret = register_netdev(dev);

drivers/net/pcnet32.c

@@ -456,6 +456,14 @@ static struct pcnet32_access pcnet32_dwio = {
     .reset	= pcnet32_dwio_reset
 };
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void pcnet32_poll_controller(struct net_device *dev)
+{ 
+	disable_irq(dev->irq);
+	pcnet32_interrupt(0, dev, NULL);
+	enable_irq(dev->irq);
+} 
+#endif
 
 
 /* only probes for non-PCI devices, the rest are handled by 
@@ -806,6 +814,10 @@ pcnet32_probe1(unsigned long ioaddr, unsigned int irq_line, int shared,
     dev->tx_timeout = pcnet32_tx_timeout;
     dev->watchdog_timeo = (5*HZ);
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+    dev->poll_controller = pcnet32_poll_controller;
+#endif    
+
     /* Fill in the generic fields of the device structure. */
     if (register_netdev(dev))
 	goto err_free_consistent;

drivers/net/smc-mca.c

@@ -324,6 +324,9 @@ int __init ultramca_probe(struct device *gen_dev)
 
 	dev->open = &ultramca_open;
 	dev->stop = &ultramca_close_card;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 
 	NS8390_init(dev, 0);
 

drivers/net/smc-ultra.c

@@ -121,6 +121,14 @@ MODULE_DEVICE_TABLE(isapnp, ultra_device_ids);
 #define ULTRA_IO_EXTENT 32
 #define EN0_ERWCNT		0x08	/* Early receive warning count. */
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void ultra_poll(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	ei_interrupt(dev->irq, dev, NULL);
+	enable_irq(dev->irq);
+}
+#endif
 /*	Probe for the Ultra.  This looks like a 8013 with the station
 	address PROM at I/O ports <base>+8 to <base>+13, with a checksum
 	following.
@@ -134,6 +142,9 @@ static int __init do_ultra_probe(struct net_device *dev)
 
 	SET_MODULE_OWNER(dev);
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = &ultra_poll;
+#endif
 	if (base_addr > 0x1ff)		/* Check a single specified location. */
 		return ultra_probe1(dev, base_addr);
 	else if (base_addr != 0)	/* Don't probe at all. */
@@ -301,6 +312,9 @@ static int __init ultra_probe1(struct net_device *dev, int ioaddr)
 	ei_status.reset_8390 = &ultra_reset_8390;
 	dev->open = &ultra_open;
 	dev->stop = &ultra_close_card;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 
 	return 0;

drivers/net/smc-ultra32.c

@@ -268,6 +268,9 @@ static int __init ultra32_probe1(struct net_device *dev, int ioaddr)
 	ei_status.reset_8390 = &ultra32_reset_8390;
 	dev->open = &ultra32_open;
 	dev->stop = &ultra32_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 
 	return 0;

drivers/net/stnic.c

@@ -124,6 +124,9 @@ static int __init stnic_probe(void)
   dev->irq = IRQ_STNIC;
   dev->open = &stnic_open;
   dev->stop = &stnic_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+  dev->poll_controller = ei_poll;
+#endif
 
   /* Snarf the interrupt now.  There's no point in waiting since we cannot
      share and the board will usually be enabled. */

drivers/net/tg3.c

@@ -2479,6 +2479,13 @@ static irqreturn_t tg3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 static int tg3_init_hw(struct tg3 *);
 static int tg3_halt(struct tg3 *);
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void tg3_poll_controller(struct net_device *dev)
+{
+	tg3_interrupt(dev->irq, dev, NULL);
+}
+#endif
+
 static void tg3_reset_task(void *_data)
 {
 	struct tg3 *tp = _data;
@@ -7696,6 +7703,9 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
 	dev->watchdog_timeo = TG3_TX_TIMEOUT;
 	dev->change_mtu = tg3_change_mtu;
 	dev->irq = pdev->irq;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = tg3_poll_controller;
+#endif
 
 	err = tg3_get_invariants(tp);
 	if (err) {

drivers/net/tlan.c

@@ -814,6 +814,14 @@ static void  __init TLan_EisaProbe (void)
 
 } /* TLan_EisaProbe */
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void TLan_Poll(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	TLan_HandleInterrupt(dev->irq, dev, NULL);
+	enable_irq(dev->irq);
+}
+#endif
 
 	
 
@@ -893,6 +901,9 @@ static int TLan_Init( struct net_device *dev )
 	dev->get_stats = &TLan_GetStats;
 	dev->set_multicast_list = &TLan_SetMulticastList;
 	dev->do_ioctl = &TLan_ioctl;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = &TLan_Poll;
+#endif
 	dev->tx_timeout = &TLan_tx_timeout;
 	dev->watchdog_timeo = TX_TIMEOUT;
 

drivers/net/tulip/tulip_core.c

@@ -253,7 +253,7 @@ static void tulip_down(struct net_device *dev);
 static struct net_device_stats *tulip_get_stats(struct net_device *dev);
 static int private_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 static void set_rx_mode(struct net_device *dev);
-
+static void poll_tulip(struct net_device *dev);
 
 
 static void tulip_set_power_state (struct tulip_private *tp,
@@ -1618,6 +1618,9 @@ static int __devinit tulip_init_one (struct pci_dev *pdev,
 	dev->get_stats = tulip_get_stats;
 	dev->do_ioctl = private_ioctl;
 	dev->set_multicast_list = set_rx_mode;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = &poll_tulip;
+#endif
 
 	if (register_netdev(dev))
 		goto err_out_free_ring;
@@ -1774,6 +1777,22 @@ static void __devexit tulip_remove_one (struct pci_dev *pdev)
 	/* pci_power_off (pdev, -1); */
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+
+static void poll_tulip (struct net_device *dev)
+{
+	/* disable_irq here is not very nice, but with the lockless
+	   interrupt handler we have no other choice. */
+	disable_irq(dev->irq);
+	tulip_interrupt (dev->irq, dev, NULL);
+	enable_irq(dev->irq);
+}
+#endif
 
 static struct pci_driver tulip_driver = {
 	.name		= DRV_NAME,

drivers/net/via-rhine.c

@@ -615,6 +615,15 @@ static void __devinit reload_eeprom(long ioaddr)
 			break;
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void via_rhine_poll(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	via_rhine_interrupt(dev->irq, (void *)dev, NULL);
+	enable_irq(dev->irq);
+}
+#endif
+
 static int __devinit via_rhine_init_one (struct pci_dev *pdev,
 					 const struct pci_device_id *ent)
 {
@@ -784,6 +793,9 @@ static int __devinit via_rhine_init_one (struct pci_dev *pdev,
 	dev->ethtool_ops = &netdev_ethtool_ops;
 	dev->tx_timeout = via_rhine_tx_timeout;
 	dev->watchdog_timeo = TX_TIMEOUT;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = via_rhine_poll;
+#endif
 	if (np->drv_flags & ReqTxAlign)
 		dev->features |= NETIF_F_SG|NETIF_F_HW_CSUM;
 

drivers/net/wd.c

@@ -333,6 +333,9 @@ static int __init wd_probe1(struct net_device *dev, int ioaddr)
 	ei_status.get_8390_hdr = &wd_get_8390_hdr;
 	dev->open = &wd_open;
 	dev->stop = &wd_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
 	NS8390_init(dev, 0);
 
 #if 1

drivers/net/zorro8390.c

@@ -222,6 +222,9 @@ static int __init zorro8390_init(struct net_device *dev, unsigned long board,
     ei_status.reg_offset = zorro8390_offsets;
     dev->open = &zorro8390_open;
     dev->stop = &zorro8390_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+    dev->poll_controller = ei_poll;
+#endif
 #ifdef MODULE
     ei_status.priv = (unsigned long)root_zorro8390_dev;
     root_zorro8390_dev = dev;

include/linux/netdevice.h

@@ -456,6 +456,12 @@ struct net_device
 						     unsigned char *haddr);
 	int			(*neigh_setup)(struct net_device *dev, struct neigh_parms *);
 	int			(*accept_fastpath)(struct net_device *, struct dst_entry*);
+#ifdef CONFIG_NETPOLL_RX
+	int			netpoll_rx;
+#endif
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	void                    (*poll_controller)(struct net_device *dev);
+#endif
 
 	/* bridge stuff */
 	struct net_bridge_port	*br_port;
@@ -545,6 +551,9 @@ extern int		dev_new_index(void);
 extern struct net_device	*dev_get_by_index(int ifindex);
 extern struct net_device	*__dev_get_by_index(int ifindex);
 extern int		dev_restart(struct net_device *dev);
+#ifdef CONFIG_NETPOLL_TRAP
+extern int		netpoll_trap(void);
+#endif
 
 typedef int gifconf_func_t(struct net_device * dev, char * bufptr, int len);
 extern int		register_gifconf(unsigned int family, gifconf_func_t * gifconf);
@@ -603,12 +612,20 @@ static inline void netif_start_queue(struct net_device *dev)
 
 static inline void netif_wake_queue(struct net_device *dev)
 {
+#ifdef CONFIG_NETPOLL_TRAP
+	if (netpoll_trap())
+		return;
+#endif
 	if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
 		__netif_schedule(dev);
 }
 
 static inline void netif_stop_queue(struct net_device *dev)
 {
+#ifdef CONFIG_NETPOLL_TRAP
+	if (netpoll_trap())
+		return;
+#endif
 	set_bit(__LINK_STATE_XOFF, &dev->state);
 }
 

include/linux/netpoll.h

+/*
+ * Common code for low-level network console, dump, and debugger code
+ *
+ * Derived from netconsole, kgdb-over-ethernet, and netdump patches
+ */
+
+#ifndef _LINUX_NETPOLL_H
+#define _LINUX_NETPOLL_H
+
+#include <linux/netdevice.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/list.h>
+
+struct netpoll;
+
+struct netpoll {
+	struct net_device *dev;
+	char dev_name[16], *name;
+	void (*rx_hook)(struct netpoll *, int, char *, int);
+	u32 local_ip, remote_ip;
+	u16 local_port, remote_port;
+	unsigned char local_mac[6], remote_mac[6];
+	struct list_head rx_list;
+};
+
+void netpoll_poll(struct netpoll *np);
+void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
+void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
+int netpoll_parse_options(struct netpoll *np, char *opt);
+int netpoll_setup(struct netpoll *np);
+int netpoll_trap(void);
+void netpoll_set_trap(int trap);
+void netpoll_cleanup(struct netpoll *np);
+int netpoll_rx(struct sk_buff *skb);
+
+
+#endif

net/Kconfig

@@ -664,4 +664,20 @@ source "net/irda/Kconfig"
 
 source "net/bluetooth/Kconfig"
 
+config NETPOLL
+	def_bool NETCONSOLE
+
+config NETPOLL_RX
+	bool "Netpoll support for trapping incoming packets"
+	default n
+	depends on NETPOLL
+
+config NETPOLL_TRAP
+	bool "Netpoll traffic trapping"
+	default n
+	depends on NETPOLL
+
+config NET_POLL_CONTROLLER
+	def_bool NETPOLL
+
 endmenu

net/core/Makefile

@@ -13,3 +13,4 @@ obj-$(CONFIG_NETFILTER) += netfilter.o
 obj-$(CONFIG_NET_DIVERT) += dv.o
 obj-$(CONFIG_NET_PKTGEN) += pktgen.o
 obj-$(CONFIG_NET_RADIO) += wireless.o
+obj-$(CONFIG_NETPOLL) += netpoll.o

net/core/dev.c

@@ -105,6 +105,7 @@
 #include <linux/kmod.h>
 #include <linux/module.h>
 #include <linux/kallsyms.h>
+#include <linux/netpoll.h>
 #ifdef CONFIG_NET_RADIO
 #include <linux/wireless.h>		/* Note : will define WIRELESS_EXT */
 #include <net/iw_handler.h>
@@ -1572,6 +1573,13 @@ int netif_rx(struct sk_buff *skb)
 	struct softnet_data *queue;
 	unsigned long flags;
 
+#ifdef CONFIG_NETPOLL_RX
+	if (skb->dev->netpoll_rx && netpoll_rx(skb)) {
+		kfree_skb(skb);
+		return NET_RX_DROP;
+	}
+#endif
+
 	if (!skb->stamp.tv_sec)
 		do_gettimeofday(&skb->stamp);
 
@@ -1727,6 +1735,13 @@ int netif_receive_skb(struct sk_buff *skb)
 	int ret = NET_RX_DROP;
 	unsigned short type = skb->protocol;
 
+#ifdef CONFIG_NETPOLL_RX
+	if (skb->dev->netpoll_rx && skb->dev->poll && netpoll_rx(skb)) {
+		kfree_skb(skb);
+		return NET_RX_DROP;
+	}
+#endif
+
 	if (!skb->stamp.tv_sec)
 		do_gettimeofday(&skb->stamp);