Re: [PATCH net v2 3/3] net: stmmac: skip queueMaxSDU check for AF_XDP
From: Simon Horman <horms@kernel.org>
Date: 2026-08-17 10:18:00
Also in:
bpf, intel-wired-lan, linux-arm-kernel, linux-rdma, lkml
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@fomichev.me>Reviewed-by: Simon Horman <horms@kernel.org>