netdev - Re: [PATCH bpf-next 1/3] netkit: Allow for configuring needed

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Message-ID: <26e95063-4737-42f1-91e2-74aae0e71941@blackwall.org>
Date: Sat, 21 Dec 2024 09:22:09 +0200
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Daniel Borkmann <daniel@...earbox.net>, martin.lau@...ux.dev
Cc: pabeni@...hat.com, bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next 1/3] netkit: Allow for configuring
 needed_{head,tail}room

On 12/19/24 19:39, Daniel Borkmann wrote:
> Allow the user to configure needed_{head,tail}room for both netkit
> devices. The idea is similar to 163e529200af ("veth: implement
> ndo_set_rx_headroom") with the difference that the two parameters
> can be specified upon device creation. By default the current behavior
> stays as is which is needed_{head,tail}room is 0.
> 
> In case of Cilium, for example, the netkit devices are not enslaved
> into a bridge or openvswitch device (rather, BPF-based redirection
> is used out of tcx), and as such these parameters are not propagated
> into the Pod's netns via peer device.
> 
> Given Cilium can run in vxlan/geneve tunneling mode (needed_headroom)
> and/or be used in combination with WireGuard (needed_{head,tail}room),
> allow the Cilium CNI plugin to specify these two upon netkit device
> creation.
> 
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: Nikolay Aleksandrov <razor@...ckwall.org>
> ---
>  drivers/net/netkit.c               | 66 +++++++++++++++++++-----------
>  include/uapi/linux/if_link.h       |  2 +
>  tools/include/uapi/linux/if_link.h |  2 +
>  3 files changed, 47 insertions(+), 23 deletions(-)
> 

Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>