netdev - Re: [PATCH ipsec-next 2/3] xfrm: interface: Add unstable helpers for setting/getting XFRM metadata from TC-BPF

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Date:   Tue, 29 Nov 2022 10:50:01 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>
CC:     Eyal Birger <eyal.birger@...il.com>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <herbert@...dor.apana.org.au>,
        <andrii@...nel.org>, <daniel@...earbox.net>,
        <nicolas.dichtel@...nd.com>, <razor@...ckwall.org>,
        <mykolal@...com>, <ast@...nel.org>, <song@...nel.org>,
        <yhs@...com>, <john.fastabend@...il.com>, <kpsingh@...nel.org>,
        <sdf@...gle.com>, <haoluo@...gle.com>, <jolsa@...nel.org>,
        <shuah@...nel.org>
Subject: Re: [PATCH ipsec-next 2/3] xfrm: interface: Add unstable helpers for
 setting/getting XFRM metadata from TC-BPF

On Mon, Nov 28, 2022 at 05:58:23PM -0800, Martin KaFai Lau wrote:
> On 11/28/22 8:05 AM, Eyal Birger wrote:
> > This change adds xfrm metadata helpers using the unstable kfunc call
> > interface for the TC-BPF hooks. This allows steering traffic towards
> > different IPsec connections based on logic implemented in bpf programs.
> > 
> > This object is built based on the availabilty of BTF debug info.
> > 
> > The metadata percpu dsts used on TX take ownership of the original skb
> > dsts so that they may be used as part of the xfrm transmittion logic -
> > e.g.  for MTU calculations.
> 
> A few quick comments and questions:
> 
> > 
> > Signed-off-by: Eyal Birger <eyal.birger@...il.com>
> > ---
> >   include/net/dst_metadata.h     |  1 +
> >   include/net/xfrm.h             | 20 ++++++++
> >   net/core/dst.c                 |  4 ++
> >   net/xfrm/Makefile              |  6 +++
> >   net/xfrm/xfrm_interface_bpf.c  | 92 ++++++++++++++++++++++++++++++++++
> 
> Please tag for bpf-next

This is a change to xfrm ipsec, so it should go
through the ipsec-next tree, unless there is
a good reason for handling that different.