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kernel: netconsole: add network console logging support

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Accessing the console on many devices is difficult.
netconsole eases debugging on devices that crash
after the network is up.

Reference to the netconsole documentation in upstream Linux:
<https://www.kernel.org/doc/html/latest/networking/netconsole.html>
|
|netconsole=[+][src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
|
| where
|  +            if present, enable extended console support
|  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)

OpenWrt specific notes:

OpenWrt's device userspace scripts are attaching the network
interface (i.e. eth0) to a (virtual) bridge (br-lan) device.
This will cause netconsole to report:
|network logging stopped on interface eth0 as it is joining a master device
(and unfortunately the traffic/logs to stop at this point)

As a workaround, the netconsole module can be manually loaded
again after the bridge has been setup with:

 insmod netconsole netconsole=@/br-lan,@192.168.1.x/MA:C...

One way of catching errors before the handoff, try to
append the /etc/modules.conf file with the following extra line:
 options netconsole netconsole=@/eth0,@192.168.1.x/MA:C...

and install the kmod-netconsole (=y) into the base image.

Signed-off-by: Catalin Toda <catalinii@yahoo.com>
(Added commit message from PR, added links to documentation)
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
(cherry picked from commit 488b25f5ac)
This commit is contained in:
Catalin Toda 2022-07-15 10:18:23 -07:00 committed by Hauke Mehrtens
parent 1f9bf1ee82
commit 69ed96fba8
1 changed files with 16 additions and 0 deletions
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16
package/kernel/linux/modules/netsupport.mk
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@ -1437,3 +1437,19 @@ define KernelPackage/wireguard/description
endef
$(eval $(call KernelPackage,wireguard))
define KernelPackage/netconsole
SUBMENU:=$(NETWORK_SUPPORT_MENU)
TITLE:=Network console logging support
KCONFIG:=CONFIG_NETCONSOLE \
CONFIG_NETCONSOLE_DYNAMIC=n
FILES:=$(LINUX_DIR)/drivers/net/netconsole.ko
AUTOLOAD:=$(call AutoProbe,netconsole)
endef
define KernelPackage/netconsole/description
Network console logging support.
endef
$(eval $(call KernelPackage,netconsole))