Aw: Re: Re: [PATCH net v3 4/5] net: ethernet: mtk_eth_soc: drop generic vlan rx offload, only use DSA untagging

[Frank Wunderlich]

Hi

> Gesendet: Freitag, 30. Dezember 2022 um 15:58 Uhr
> Von: "Felix Fietkau" <nbd at nbd.name>

> Does this help?
> ---
> --- a/net/dsa/tag_mtk.c
> +++ b/net/dsa/tag_mtk.c
> @@ -25,6 +25,14 @@ static struct sk_buff *mtk_tag_xmit(stru
>   	u8 xmit_tpid;
>   	u8 *mtk_tag;
>
> +	/* The Ethernet switch we are interfaced with needs packets to be at
> +	 * least 64 bytes (including FCS) otherwise their padding might be
> +	 * corrupted. With tags enabled, we need to make sure that packets are
> +	 * at least 68 bytes (including FCS and tag).
> +	 */
> +	if (__skb_put_padto(skb, ETH_ZLEN + MTK_HDR_LEN, false))
> +		return NULL;
> +
>   	/* Build the special tag after the MAC Source Address. If VLAN header
>   	 * is present, it's required that VLAN header and special tag is
>   	 * being combined. Only in this way we can allow the switch can parse

no, i verified my vlan-setup ist right by adding additional device (my r2) into the same 2 vlans. My Laptop can ping both vlans of R2, but on r3/mt7986 only vlan500 (on eth1) works, not 600 on wan-port of mt7986.

see arp going out on r3, but not received in the other side (laptop/r2)....

any debug i can add for this? ethtool does not show stats for vlans, for wan i see no CRC/drops

regards Frank