netdev - Re: eBPF equivalent of SKF_AD

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Message-ID: <ad37a96a-1fe1-7b00-25fd-ea3ed5279f4d@iogearbox.net>
Date:   Thu, 24 Jan 2019 12:40:57 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Maciej Żenczykowski <zenczykowski@...il.com>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     Linux NetDev <netdev@...r.kernel.org>
Subject: Re: eBPF equivalent of SKF_AD_HATYPE / skb->dev->type

On 01/24/2019 12:27 PM, Maciej Żenczykowski wrote:
> In classic BPF 'SKF_AD_HATYPE' can be used to fetch skb->dev->type.
> 
> Are my eyes deceiving me, or is there a similar way to get at it from eBPF?
> 
> (while we're at it, skb->dev->mtu would probably be useful too)

Yeah we can add it if you have a concrete use case for access out of the BPF
program, feel free to send a patch. So far nobody ran into the need for it
which is why it hasn't been added yet.

Thanks,
Daniel