Re: [PATCH net-next 2/4] netconsole: Add configfs attribute for direct message sending

On Fri, Nov 28, 2025 at 06:20:47AM -0800, Breno Leitao wrote:

Add a new write-only configfs attribute "send_msg" to netconsole targets that allows sending arbitrary messages directly through netconsole.

This feature enables users to send custom messages through netconsole without having to go through the kernel logging infrastructure. Messages can be sent by simply writing to: /sys/kernel/config/netconsole/<target>/send_msg

The implementation:

• Checks if the target is enabled before sending
• Verifies the network interface is running
• Handles both basic and extended message formats
• Fragments large messages when needed for basic targets
• Reuses existing send_msg_udp() and send_ext_msg_udp() functions

Unfortunately this patch has two forward declaration, which is not ideal, but, moving send_msg_udp() functions earlier would cause too many changes, and this could be done in an idependent patch.

Signed-off-by: Breno Leitao leitao@debian.org

Reviewed-by: Simon Horman horms@kernel.org