[PATCH net-next 3/3] net: stmmac: skip queueMaxSDU check for AF_XDP
From: Stanislav Fomichev <hidden>
Date: 2026-08-10 18:47:57
Also in:
bpf, intel-wired-lan, linux-arm-kernel, linux-rdma, lkml
Subsystem:
networking drivers, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Maxime Chevallier, Linus Torvalds
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.
Fixes: c5c3e1bfc9e0 ("net: stmmac: Offload queueMaxSDU from tc-taprio")
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index efa35cfecc4f..6e9d4cb336ee 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c@@ -2714,13 +2714,6 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget) if (!xsk_tx_peek_desc(pool, &xdp_desc)) break; - if (priv->est && priv->est->enable && - priv->est->max_sdu[queue] && - xdp_desc.len > priv->est->max_sdu[queue]) { - priv->xstats.max_sdu_txq_drop[queue]++; - continue; - } - tx_desc = stmmac_get_tx_desc(priv, tx_q, entry); dma_addr = xsk_buff_raw_get_dma(pool, xdp_desc.addr); meta = xsk_buff_get_metadata(pool, xdp_desc.addr,
--
2.53.0-Meta