netdev - Re: mlx5e uplink hairpin forwarding

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Date:   Sat, 20 Jun 2020 21:35:58 +0300
From:   Eli Cohen <eli@...lanox.com>
To:     Tonghao Zhang <xiangxia.m.yue@...il.com>
Cc:     ozsh@...lanox.com, Saeed Mahameed <saeedm@...lanox.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: mlx5e uplink hairpin forwarding

On Sat, Jun 20, 2020 at 08:02:19PM +0800, Tonghao Zhang wrote:
> Hi Eli
> 
> I review your patches and try to test it.
> $ tc filter add dev enp130s0f0  protocol ip prio 1 root flower dst_ip
> 11.12.13.14 skip_sw action mirred egress redirect dev enp130s0f1
> or
> $ tc filter add dev enp130s0f0  protocol ip prio 1 parent ffff: flower
> dst_ip 11.12.13.14 skip_sw action mirred egress redirect dev
> enp130s0f1
> 
> TC can't install the rules above. The error message:
> mlx5_core: devices are both uplink, can't offload forwarding.
> 
> So how can I install hairpin rules between uplink and uplink forwarding ?
> 
> The test environment
> kernel 5.8.0-rc1+, the last commit id:69119673bd50b176ded34032fadd41530fb5af21
> NIC MCX512A-ACA_Ax
> FW 16.27.2008
> enp130s0f0、enp130s0f1 are uplink rep.
>

Hi Tonghao,
please note that hairpin is supported on the same uplink representor.
You cannot hairpin from one uplink to another.