Re: [RFC v2 bpf-next 3/7] xsk: add usage of XDP features flags

[Yonghong Song <yhs@meta.com>]

On 1/14/23 7:54 AM, Lorenzo Bianconi wrote:
> From: Marek Majtyka <alardam@gmail.com>
> 
> Change necessary condition check for XSK from ndo functions to
> xdp features flags.
> 
> Signed-off-by: Marek Majtyka <alardam@gmail.com>
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
>   net/xdp/xsk_buff_pool.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
> index ed6c71826d31..2e6fa082142a 100644
> --- a/net/xdp/xsk_buff_pool.c
> +++ b/net/xdp/xsk_buff_pool.c
> @@ -178,8 +178,7 @@ int xp_assign_dev(struct xsk_buff_pool *pool,
>   		/* For copy-mode, we are done. */
>   		return 0;
>   
> -	if (!netdev->netdev_ops->ndo_bpf ||
> -	    !netdev->netdev_ops->ndo_xsk_wakeup) {
> +	if ((netdev->xdp_features & NETDEV_XDP_ACT_ZC) != NETDEV_XDP_ACT_ZC) {

Maybe:
	if (!(netdev->xdp_features & NETDEV_XDP_ACT_ZC))
?

>   		err = -EOPNOTSUPP;
>   		goto err_unreg_pool;
>   	}