Re: [PATCH net v2] usbnet: limit max_mtu based on device's hard_mtu

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Mon, 19 Jan 2026 08:55:18 +0100 you wrote:
> The usbnet driver initializes net->max_mtu to ETH_MAX_MTU before calling
> the device's bind() callback. When the bind() callback sets
> dev->hard_mtu based the device's actual capability (from CDC Ethernet's
> wMaxSegmentSize descriptor), max_mtu is never updated to reflect this
> hardware limitation).
> 
> This allows userspace (DHCP or IPv6 RA) to configure MTU larger than the
> device can handle, leading to silent packet drops when the backend sends
> packet exceeding the device's buffer size.
> 
> [...]

Here is the summary with links:
  - [net,v2] usbnet: limit max_mtu based on device's hard_mtu
    https://git.kernel.org/netdev/net/c/c7159e960f14

You are awesome, thank you!
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