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: Maciej Żenczykowski <maze@xxxxxxxxxx>
Date: Wed, 7 Oct 2020 10:44:30 -0700
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>, 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: <a8b0dd01-bd6a-2a28-154e-c30a79ce3c83@gmail.com>

> > 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.

Fair enough.

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

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