[xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Alexei Starovoitov <alexei.starovoitov@gmail.com>]

On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> Implement .xmo_rx_csum callback to allow XDP code to determine,
> whether HW has validated any checksums.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> index 54685d0747aa..6647a7e55ac8 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
>  	return 0;
>  }
>  
> +/**
> + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> + * @ctx: XDP buff pointer
> + * @csum_status: destination address
> + * @csum_info: destination address
> + *
> + * Copy HW checksum level (if was checked) to the destination address.
> + */
> +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> +			   enum xdp_csum_status *csum_status,
> +			   union xdp_csum_info *csum_info)
> +{
> +	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> +	const union ice_32b_rx_flex_desc *eop_desc;
> +	enum ice_rx_csum_status status;
> +	u16 ptype;
> +
> +	eop_desc = xdp_ext->pkt_ctx.eop_desc;
> +	ptype = ice_get_ptype(eop_desc);
> +
> +	status = ice_get_rx_csum_status(eop_desc, ptype);
> +	if (status & ICE_RX_CSUM_NONE)
> +		return -ENODATA;
> +
> +	*csum_status = ice_rx_csum_lvl(status) + 1;
> +	return 0;
> +}

and xdp_csum_info from previous patch left uninitialized?
What was the point adding it then?