5.15-stable review patch. If anyone has any objections, please let me know.
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From: Felix Fietkau nbd@nbd.name
[ Upstream commit d4736737110ffa83d29f1c5d17b26113864205f6 ]
When sending llc packets with vlan tx offload, the hardware fails to actually add the tag. Deal with this by fixing it up in software.
Fixes: 656e705243fd ("net-next: mediatek: add support for MT7623 ethernet") Reported-by: Thibaut VARENE hacks@slashdirt.org Signed-off-by: Felix Fietkau nbd@nbd.name Reviewed-by: Simon Horman horms@kernel.org Link: https://patch.msgid.link/20250831182007.51619-1-nbd@nbd.name Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 711acc6059a4f..4d7a72bcee614 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1196,6 +1196,13 @@ static netdev_tx_t mtk_start_xmit(struct sk_buff *skb, struct net_device *dev) bool gso = false; int tx_num;
+ if (skb_vlan_tag_present(skb) && + !eth_proto_is_802_3(eth_hdr(skb)->h_proto)) { + skb = __vlan_hwaccel_push_inside(skb); + if (!skb) + goto dropped; + } + /* normally we can rely on the stack not calling this more than once, * however we have 2 queues running on the same ring so we need to lock * the ring access @@ -1241,8 +1248,9 @@ static netdev_tx_t mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
drop: spin_unlock(ð->page_lock); - stats->tx_dropped++; dev_kfree_skb_any(skb); +dropped: + stats->tx_dropped++; return NETDEV_TX_OK; }