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([2601:282:803:7700:6191:8310:a1b6:e817]) by smtp.googlemail.com with ESMTPSA id b22sm1832828qkk.20.2020.02.21.09.31.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Feb 2020 09:31:42 -0800 (PST) Subject: Re: [net-next 1/2] Perform IPv4 FIB lookup in a predefined FIB table To: Carmine Scarpitta Cc: davem@davemloft.net, kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, kuba@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, ahmed.abdelsalam@gssi.it, dav.lebrun@gmail.com, andrea.mayer@uniroma2.it, paolo.lungaroni@cnit.it, hiroki.shirokura@linecorp.com References: <20200213010932.11817-1-carmine.scarpitta@uniroma2.it> <20200213010932.11817-2-carmine.scarpitta@uniroma2.it> <7302c1f7-b6d1-90b7-5df1-3e5e0ba98f53@gmail.com> <20200219005007.23d724b7f717ef89ad3d75e5@uniroma2.it> <20200219034924.272d991505ee68d95566ff8d@uniroma2.it> <20200220233336.53eda87e7a76ed24317e0165@uniroma2.it> From: David Ahern Message-ID: <70077e59-1614-b059-a85e-42863f63144f@gmail.com> Date: Fri, 21 Feb 2020 10:31:40 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.4.2 MIME-Version: 1.0 In-Reply-To: <20200220233336.53eda87e7a76ed24317e0165@uniroma2.it> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/20/20 3:33 PM, Carmine Scarpitta wrote: > As you can see, what is missing is having SRv6 End.DT4 supported to do > decapsulation and VRF lookup. Thanks for the detailed explanation and reference. Both this comment and the slides reference VRF and per-tenant table lookup which is the same as VRF. If you allocated a VRF device for the tenant, the SRv6 header pop and route lookup can be done very similar to how MPLS works when the goal is to do a route lookup vs forwarding to a specific nexthop, be it main table: ip -f mpls route add 200 dev lo or VRF table ip -f mpls route add 200 dev red Take a look at the mpls code. Unless I am missing something this use case is very similar.