netdev - Re: Problem about gre tunnel route offload in mlxsw

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Message-ID: <ca6e27e4-8bec-8591-9bab-d411649d1834@ucloud.cn>
Date:   Thu, 26 Dec 2019 16:22:48 +0800
From:   wenxu <wenxu@...oud.cn>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     netdev@...r.kernel.org, mlxsw@...lanox.com
Subject: Re: Problem about gre tunnel route offload in mlxsw


On 12/26/2019 3:49 PM, Ido Schimmel wrote:
> On Thu, Dec 26, 2019 at 01:07:33PM +0800, wenxu wrote:
>> Hi mlxsw team,
>>
>>
>> I did a route test with gre tunnel and vrf.
>>
>> This test under current net-next tree with following script:
>>
>>
>> ifconfig enp3s0np31 up
>> ip a a dev enp3s0np31 172.168.152.247/24
>>
>> ip l add dev vrf11 type vrf table 11
>> ifconfig vrf11 up
>> ip l set dev enp3s0np11 master vrf11
>> ifconfig enp3s0np11 10.0.7.1/24 up
>> ip tunnel add name gre11 mode gre local 172.168.152.247 remote 172.168.152.73 key 11 tos inherit  ttl inherit
>> ip l set dev gre11 master vrf11
>> ifconfig gre11 10.0.2.1/24 up
>>
>> ip l add dev vrf21 type vrf table 21
>> ifconfig vrf21 up
>> ip l set dev enp3s0np21 master vrf21
>> ifconfig enp3s0np21 10.0.7.1/24 up
>> ip tunnel add name gre21 mode gre local 172.168.152.247 remote 172.168.152.73 key 21 tos inherit  ttl inherit
>> ip l set dev gre21 master vrf21
>> ifconfig gre21 10.0.2.1/24 up
>>
>>
>> If there is only one tunnel. The route rule can be offloaded. But two tunnel only with different key can't be offloaded.
>>
>> If I add a new address 172.168.152.248 for tunnel source and change the gre21 to
>>
>> "ip tunnel add name gre21 mode gre local 172.168.152.248 remote 172.168.152.73 key 21 tos inherit  ttl inherit"
>>
>> It's work.
>>
>> So it means dispatch based on tunnel key is not supported ?
> Yes. See:
> "No two tunnels that share underlay VRF shall share a local address
> (i.e. dispatch based on tunnel key is not supported)"
>
> https://github.com/Mellanox/mlxsw/wiki/L3-Tunneling#features-and-limitations
>
>> It is a hardware limits or just software unsupported?
> Software. In hardware you can perform decapsulation in the router or
> using ACLs. mlxsw uses the former so the key is {tb_id, prefix}. With
> ACLs it is possible to match on more attributes.
>
I find mlxsw use ACL through TC flower. But currently It does't support ecn_*_keys in the flower match?

Also it doesn't support the action "redirect to GRE Tunnel device"?