[xdp-hints] Re: [RFC bpf-next 11/23] ice: use VLAN proto from ring packet context in skb path

[Alexander Lobakin <aleksander.lobakin@intel.com>]

From: Larysa Zaremba <larysa.zaremba@intel.com>
Date: Thu, 24 Aug 2023 21:26:50 +0200

> VLAN proto, used in ice XDP hints implementation is stored in ring packet
> context. Utilize this value in skb VLAN processing too instead of checking
> netdev features.
> 
> At the same time, use vlan_tci instead of vlan_tag in touched code,
> because vlan_tag is misleading.

[...]

>  void
> -ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag)
> +ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tci)
>  {
> -	netdev_features_t features = rx_ring->netdev->features;
> -	bool non_zero_vlan = !!(vlan_tag & VLAN_VID_MASK);
> -
> -	if ((features & NETIF_F_HW_VLAN_CTAG_RX) && non_zero_vlan)
> -		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
> -	else if ((features & NETIF_F_HW_VLAN_STAG_RX) && non_zero_vlan)
> -		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD), vlan_tag);
> +	if (vlan_tci & VLAN_VID_MASK && rx_ring->pkt_ctx.vlan_proto)

I'd wrap the first expression into ()s to make it more readable (and no
questions like "shouldn't these be three &&?").

> +		__vlan_hwaccel_put_tag(skb, rx_ring->pkt_ctx.vlan_proto,
> +				       vlan_tci);
>  
>  	napi_gro_receive(&rx_ring->q_vector->napi, skb);
>  }

[...]

Thanks,
Olek