netdev - Re: [PATCH bpf-next V2 1/6] bpf: Remove MTU check in __bpf_skb_max

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Message-ID: <CANP3RGeU4sMjgAjXHVRc0ES9as0tG2kBUw6jRZhz6vLTTtVEVA@mail.gmail.com>
Date:   Wed, 7 Oct 2020 16:46:10 -0700
From:   Maciej Żenczykowski <maze@...gle.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     bpf <bpf@...r.kernel.org>, Linux NetDev <netdev@...r.kernel.org>,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Lorenz Bauer <lmb@...udflare.com>,
        Shaun Crampton <shaun@...era.io>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Marek Majkowski <marek@...udflare.com>,
        John Fastabend <john.fastabend@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eyal Birger <eyal.birger@...il.com>
Subject: Re: [PATCH bpf-next V2 1/6] bpf: Remove MTU check in __bpf_skb_max_len

>  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 IP_MAX_MTU;
>  }

Shouldn't we just delete this helper instead and replace call sites?