Re: [PATCH bpf-next V1 3/6] bpf: add BPF-helper for reading MTU from net_device via ifindex

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Subject: Re: [PATCH bpf-next V1 3/6] bpf: add BPF-helper for reading MTU from net_device via ifindex
From: David Ahern <dsahern@xxxxxxxxx>
Date: Wed, 7 Oct 2020 09:35:39 -0700
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>, bpf <bpf@xxxxxxxxxxxxxxx>, Linux NetDev <netdev@xxxxxxxxxxxxxxx>, Daniel Borkmann <borkmann@xxxxxxxxxxxxx>, Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>, Lorenz Bauer <lmb@xxxxxxxxxxxxxx>, Shaun Crampton <shaun@xxxxxxxxx>, Lorenzo Bianconi <lorenzo@xxxxxxxxxx>, Marek Majkowski <marek@xxxxxxxxxxxxxx>, John Fastabend <john.fastabend@xxxxxxxxx>
In-reply-to: <CANP3RGe3S4eF=xVkQ22o=sxtW991jmNfq-bVtbKQQaszsLNZSA@mail.gmail.com>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.12.1

On 10/6/20 6:24 PM, Maciej Żenczykowski wrote:
> 
> FYI: It would be nice to have a similar function to return a device's
> L2 header size (ie. 14 for ethernet) and/or hwtype.

Why does that need to be looked up via a helper? It's a static number
for a device and can plumbed to a program in a number of ways.

Follow-Ups:
- Re: [PATCH bpf-next V1 3/6] bpf: add BPF-helper for reading MTU from net_device via ifindex
  - From: Maciej Żenczykowski

References:
- [PATCH bpf-next V1 0/6] bpf: New approach for BPF MTU handling and enforcement
  - From: Jesper Dangaard Brouer
- [PATCH bpf-next V1 3/6] bpf: add BPF-helper for reading MTU from net_device via ifindex
  - From: Jesper Dangaard Brouer
- Re: [PATCH bpf-next V1 3/6] bpf: add BPF-helper for reading MTU from net_device via ifindex
  - From: Jesper Dangaard Brouer
- Re: [PATCH bpf-next V1 3/6] bpf: add BPF-helper for reading MTU from net_device via ifindex
  - From: Jakub Kicinski
- Re: [PATCH bpf-next V1 3/6] bpf: add BPF-helper for reading MTU from net_device via ifindex
  - From: Maciej Żenczykowski

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