[PATCH net-next v5 3/3] net: stmmac: allow non-linear xdp_buff in XDP mode
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HOTtoday
From: Lorenzo Bianconi <hidden>
Date: 2026-10-09 10:26:54
Also in:
bpf, linux-arm-kernel
Subsystem:
networking drivers, stmmac ethernet driver, the rest, xdp (express data path) · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Maxime Chevallier, Linus Torvalds, Alexei Starovoitov, Daniel Borkmann, Jesper Dangaard Brouer, John Fastabend
Since the RX path now builds multi-buffer xdp_buffs, XDP can operate on frames bigger than ETH_DATA_LEN (jumbo frames and scatter-gather frames). Drop the checks that rejected attaching an XDP program when the MTU is larger than ETH_DATA_LEN, and that refused to increase the MTU while XDP is enabled. Signed-off-by: Lorenzo Bianconi <redacted> --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ------ drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c | 8 -------- 2 files changed, 14 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index be2cba8fcbc6..cbeb43011c4b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c@@ -6351,12 +6351,6 @@ static int stmmac_change_mtu(struct net_device *dev, int new_mtu) txfifosz = priv->dma_cap.tx_fifo_size; txfifosz /= priv->plat->tx_queues_to_use; - - if (stmmac_xdp_is_enabled(priv) && new_mtu > ETH_DATA_LEN) { - netdev_dbg(priv->dev, "Jumbo frames not supported for XDP\n"); - return -EINVAL; - } - new_mtu = STMMAC_ALIGN(new_mtu); /* If condition true, FIFO is too small or MTU too large */
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c
index 9af9e0cb366c..f6b3e8628a7c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c@@ -109,14 +109,6 @@ int stmmac_xdp_set_prog(struct stmmac_priv *priv, struct bpf_prog *prog, if_running = netif_running(dev); - if (prog && dev->mtu > ETH_DATA_LEN) { - /* For now, the driver doesn't support XDP functionality with - * jumbo frames so we return error. - */ - NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported"); - return -EOPNOTSUPP; - } - if (!prog) xdp_features_clear_redirect_target(dev);
--
2.56.0