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Date:   Fri, 22 May 2020 18:04:31 +0200
From:   Jesper Dangaard Brouer <>
To:     David Ahern <>
        Lorenzo Bianconi <>,
Subject: Re: [PATCH RFC bpf-next 1/4] bpf: Handle 8-byte values in DEVMAP

On Fri, 22 May 2020 14:08:05 +0200
Jesper Dangaard Brouer <> wrote:

> On Thu, 21 May 2020 19:05:23 -0600
> David Ahern <> wrote:
> > Add support to DEVMAP and DEVMAP_HASH to support 8-byte values as a
> > <device index, program id> pair. To do this, a new struct is needed in
> > bpf_dtab_netdev to hold the values to return on lookup.  
> I would like to see us leverage BTF instead of checking on the size
> attr->value_size. E.g do the sanity check based on BTF.
> Given I don't know the exact details on how this should be done, I will
> look into it... I already promised Lorenzo, as we have already
> discussed this on IRC.
> So, you can Lorenzo can go ahead with this approach, and test the
> use-case. And I'll try to figure out if-and-how we can leverage BTF
> here.  Input from BTF experts will be much appreciated.

Published my current notes here:

And created PR that people can GitHub "subscribe" to, if you are interested:

Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat

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