Subject: Re: [PATCH net] eth: fbnic: Add validation for MTU changes

From: [email-masked]
Date: Wed, 18 Feb 2026 06:33:08 +0000

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <[email-masked]>:

On Sat, 14 Feb 2026 09:19:49 -0800 you wrote:
> Increasing the MTU beyond the HDS threshold causes the hardware to
> fragment packets across multiple buffers. If a single-buffer XDP program
> is attached, the driver will drop all multi-frag frames. While we can't
> prevent a remote sender from sending non-TCP packets larger than the MTU,
> this will prevent users from inadvertently breaking new TCP streams.
> 
> Traditionally, drivers supported XDP with MTU less than 4Kb
> (packet per page). Fbnic currently prevents attaching XDP when MTU is too high.
> But it does not prevent increasing MTU after XDP is attached.
> 
> [...]

Here is the summary with links:
  - [net] eth: fbnic: Add validation for MTU changes
    https://git.kernel.org/netdev/net/c/ccd8e87748ad

You are awesome, thank you!
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