Subject: Re: [PATCH bpf-next 6/7] bpf: devmap: check XDP features in bpf_map_update_elem and __xdp_enqueue

From: Martin KaFai Lau <[email-masked]>
Date: Fri, 20 Jan 2023 18:02:18 -0800

On 1/20/23 9:16 AM, Lorenzo Bianconi wrote:
> ---
>   kernel/bpf/devmap.c | 25 +++++++++++++++++++++----
>   net/core/filter.c   | 13 +++++--------
>   2 files changed, 26 insertions(+), 12 deletions(-)
> 
> diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
> index d01e4c55b376..69ceecc792df 100644
> --- a/kernel/bpf/devmap.c
> +++ b/kernel/bpf/devmap.c
> @@ -474,7 +474,11 @@ static inline int __xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
>   {
>   	int err;
>   
> -	if (!dev->netdev_ops->ndo_xdp_xmit)
> +	if (!(dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT))

The current "dev->netdev_ops->ndo_xdp_xmit" check is self explaining.
Any plan to put some document for the NETDEV_XDP_ACT_* values?