Re: [PATCH bpf-next] bpf: don't check against device MTU in __bpf_skb_max_len

[Jakub Kicinski]

On Fri, 04 Sep 2020 11:30:28 +0200 Jesper Dangaard Brouer wrote:
> @@ -3211,8 +3211,7 @@ static int bpf_skb_net_shrink(struct sk_buff *skb, u32 
> off, u32 len_diff,
>  
>  static u32 __bpf_skb_max_len(const struct sk_buff *skb)
>  {
> -     return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len :
> -                       SKB_MAX_ALLOC;
> +     return SKB_MAX_ALLOC;
>  }
>  
>  BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
> 

Looks familiar:

https://lore.kernel.org/netdev/20200420231427.63894-1-zenczykow...@gmail.com/