[PATCH net v3 2/3] net: stmmac: Consider Tx VLAN offload tag length for maxSDU

[Russell King (Oracle)]

On Fri, Oct 17, 2025 at 02:11:20PM +0800, Rohan G Thomas via B4 Relay wrote:
> From: Rohan G Thomas <rohan.g.thomas at altera.com>
> 
> On hardware with Tx VLAN offload enabled, add the VLAN tag length to
> the skb length before checking the Qbv maxSDU if Tx VLAN offload is
> requested for the packet. Add 4 bytes for 802.1Q tag.

This needs to say _why_. Please describe the problem that the current
code suffers from. (e.g. the packet becomes too long for the queue to
handle, which causes it to be dropped - which is my guess.)

We shouldn't be guessing the reasons behind changes.

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