netdev - Re: [PATCH bpf-next v3 10/21] ice: Implement VLAN tag hint

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Date: Thu, 20 Jul 2023 19:50:27 +0100
From: Simon Horman <simon.horman@...igine.com>
To: Larysa Zaremba <larysa.zaremba@...el.com>
Cc: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
	andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
	yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
	sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
	David Ahern <dsahern@...il.com>, Jakub Kicinski <kuba@...nel.org>,
	Willem de Bruijn <willemb@...gle.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Anatoly Burakov <anatoly.burakov@...el.com>,
	Alexander Lobakin <alexandr.lobakin@...el.com>,
	Magnus Karlsson <magnus.karlsson@...il.com>,
	Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 10/21] ice: Implement VLAN tag hint

On Wed, Jul 19, 2023 at 08:37:23PM +0200, Larysa Zaremba wrote:

...

> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> index b11cfaedb81c..4ad6db83674e 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -639,7 +639,33 @@ static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
>  	return 0;
>  }
>  
> +/**
> + * ice_xdp_rx_vlan_tag - VLAN tag XDP hint handler
> + * @ctx: XDP buff pointer
> + * @vlan_tci: destination address for VLAN tag
> + * @vlan_proto: destination address for VLAN protocol
> + *
> + * Copy VLAN tag (if was stripped) and corresponding protocol
> + * to the destination address.
> + */
> +static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> +			       __be16 *vlan_proto)
> +{
> +	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> +
> +	*vlan_proto = xdp_ext->pkt_ctx.vlan_proto;
> +	if (!*vlan_proto)
> +		return -ENODATA;
> +
> +	*vlan_tci = ice_get_vlan_tci(xdp_ext->pkt_ctx.eop_desc);
> +	if (!*vlan_tag)

Hi Larysa,

Should this be vlan_tci rather than vlan_tag?

> +		return -ENODATA;
> +
> +	return 0;
> +}
> +

...