Re: [PATCH net v3] usbnet: cap max_mtu for drivers without bind callback

[patchwork-bot+netdevbpf]

Hello:

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

On Fri, 31 Jul 2026 11:27:11 +0200 you wrote:
> usbnet_probe() initializes max_mtu to ETH_MAX_MTU and only caps it
> inside the if (info->bind) block. Drivers without a bind callback
> never enter this block, so max_mtu stays at ETH_MAX_MTU.
> 
> QEMU's usb-net device (0x0525/0xa4a2) is claimed by the cdc_subset
> driver which has no bind callback. The guest accepts any MTU from DHCP
> (e.g. 65520 from passt), leading to TCP segments that exceed the
> device's 2048-byte receive buffer and are silently dropped.
> 
> [...]

Here is the summary with links:
  - [net,v3] usbnet: cap max_mtu for drivers without bind callback
    https://git.kernel.org/netdev/net/c/1505b2cb6ae1

You are awesome, thank you!
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