netdev - Re: [net-next v4 0/8] seg6: add support for SRv6 End.DT4/DT6 behavior

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Message-ID: <20201204133629.19549345@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com>
Date:   Fri, 4 Dec 2020 13:36:29 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andrea Mayer <andrea.mayer@...roma2.it>
Cc:     "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Shuah Khan <shuah@...nel.org>,
        Shrijeet Mukherjee <shrijeet@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>,
        Stefano Salsano <stefano.salsano@...roma2.it>,
        Paolo Lungaroni <paolo.lungaroni@...t.it>,
        Ahmed Abdelsalam <ahabdels.dev@...il.com>
Subject: Re: [net-next v4 0/8] seg6: add support for SRv6 End.DT4/DT6
 behavior

On Wed,  2 Dec 2020 14:05:09 +0100 Andrea Mayer wrote:
> This patchset provides support for the SRv6 End.DT4 and End.DT6 (VRF mode)
> behaviors.
> 
> The SRv6 End.DT4 behavior is used to implement multi-tenant IPv4 L3 VPNs. It
> decapsulates the received packets and performs IPv4 routing lookup in the
> routing table of the tenant. The SRv6 End.DT4 Linux implementation leverages a
> VRF device in order to force the routing lookup into the associated routing
> table.
> The SRv6 End.DT4 behavior is defined in the SRv6 Network Programming [1].
> 
> The Linux kernel already offers an implementation of the SRv6 End.DT6 behavior
> which allows us to set up IPv6 L3 VPNs over SRv6 networks. This new
> implementation of DT6 is based on the same VRF infrastructure already exploited
> for implementing the SRv6 End.DT4 behavior. The aim of the new SRv6 End.DT6 in
> VRF mode consists in simplifying the construction of IPv6 L3 VPN services in
> the multi-tenant environment.
> Currently, the two SRv6 End.DT6 implementations (legacy and VRF mode)
> coexist seamlessly and can be chosen according to the context and the user
> preferences.
> 
> - Patch 1 is needed to solve a pre-existing issue with tunneled packets
>   when a sniffer is attached;
> 
> - Patch 2 improves the management of the seg6local attributes used by the
>   SRv6 behaviors;
> 
> - Patch 3 adds support for optional attributes in SRv6 behaviors;
> 
> - Patch 4 introduces two callbacks used for customizing the
>   creation/destruction of a SRv6 behavior;
> 
> - Patch 5 is the core patch that adds support for the SRv6 End.DT4
>   behavior;
> 
> - Patch 6 introduces the VRF support for SRv6 End.DT6 behavior;
> 
> - Patch 7 adds the selftest for SRv6 End.DT4 behavior;
> 
> - Patch 8 adds the selftest for SRv6 End.DT6 (VRF mode) behavior.
> 
> Regarding iproute2, the support for the new "vrftable" attribute, required by
> both SRv6 End.DT4 and End.DT6 (VRF mode) behaviors, is provided in a different
> patchset that will follow shortly.
> 
> I would like to thank David Ahern for his support during the development of
> this patchset.

Applied, thank you!