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kernel: netconsole: add network console logging support 

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>
This commit is contained in:
Catalin Toda 2022-07-15 10:18:23 -07:00 committed by Christian Lamparter
parent e879cccaa2
commit 488b25f5ac
1 changed files with 16 additions and 0 deletions
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16
package/kernel/linux/modules/netsupport.mk
View File

@ -1346,3 +1346,19 @@ 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))