netdev - Re: [PATCH net-next] net/mlx5: Introduce SF direction

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Date: Mon, 22 May 2023 14:15:45 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Shay Drory <shayd@...dia.com>
Cc: Saeed Mahameed <saeed@...nel.org>, "David S. Miller"
 <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, Eric Dumazet
 <edumazet@...gle.com>, Saeed Mahameed <saeedm@...dia.com>,
 <netdev@...r.kernel.org>, Tariq Toukan <tariqt@...dia.com>, Moshe Shemesh
 <moshe@...dia.com>
Subject: Re: [PATCH net-next] net/mlx5: Introduce SF direction

On Mon, 22 May 2023 15:47:15 +0300 Shay Drory wrote:
> > What does it mean that an SF is "facing" the network?  
> 
> Facing the physical wire, like an UPLINK vport.
> 
> > Why can't the device automatically "optimize" the hairpin?  
> 
> Our FW/HW can do steering optimization if we know the direction in advance.
> 
> > Or SF1 / SF2 will be uni-directional after this patch?  
> 
> No. every SF will continue to be bi-directional. the change will only 
> affect steering optimization.

I'm not going to claw the details out of you. AFAICT this sounds like
a lazy knob forcing the user to configure something that could be done
automatically. Consider it rejected.