Re: [PATCH net v2 3/3] net: stmmac: skip queueMaxSDU check for AF_XDP

[Simon Horman]

On Thu, Aug 13, 2026 at 12:08:00PM -0700, Stanislav Fomichev wrote:
> Commit c5c3e1bfc9e0 ("net: stmmac: Offload queueMaxSDU from tc-taprio")
> was inspired by commit 92a0dcb8427d ("igc: offload queue max SDU from
> tc-taprio"), but the igc change does not apply the check to AF_XDP.
> 
> xsk_tx_peek_desc() reserves a completion entry. Continuing without
> queuing or completing the descriptor leaves the AF_XDP rings imbalanced,
> so remove the check from the zero-copy path.
> 
> The assumptions is that AF_XDP zero-copy traffic bypasses the qdisc, so
> taprio's queueMaxSDU check does not apply to this path.
> 
> Fixes: c5c3e1bfc9e0 ("net: stmmac: Offload queueMaxSDU from tc-taprio")
> Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxxx>

Reviewed-by: Simon Horman <horms@xxxxxxxxxx>