netdev - Re: [RFC net-next 12/15] net/mlx5e: Add PSP steering in local NIC RX

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Date: Sun, 12 May 2024 21:52:00 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, 
 netdev@...r.kernel.org
Cc: pabeni@...hat.com, 
 willemdebruijn.kernel@...il.com, 
 borisp@...dia.com, 
 gal@...dia.com, 
 cratiu@...dia.com, 
 rrameshbabu@...dia.com, 
 steffen.klassert@...unet.com, 
 tariqt@...dia.com, 
 Raed Salem <raeds@...dia.com>, 
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: [RFC net-next 12/15] net/mlx5e: Add PSP steering in local NIC RX

Jakub Kicinski wrote:
> From: Raed Salem <raeds@...dia.com>
> 
> Introduce decrypt FT, the RX error FT, and the default rules.
> 
> The PSP (PSP) RX decrypt flow table is pointed by the TTC
> (Traffic Type Classifier) UDP steering rules.
> The decrypt flow table has two flow groups. The first flow group
> keeps the decrypt steering rule programmed always when PSP packet is
> recognized using the dedicated udp destenation port number 1000, if

typo: destination

> packet is decrypted then a PSP marker is set in metadata_regB[30].
> The second flow group has a default rule to forward all non-offloaded
> PSP packet to the TTC UDP default RSS TIR.
> 
> The RX error flow table is the destination of the decrypt steering rules in
> the PSP RX decrypt flow table. It has two fixed rule one with single copy
> action that copies nisp_syndrome to metadata_regB[23:29]. The PSP marker
> and syndrome is used to filter out non-nisp packet and to return the PSP
> crypto offload status in Rx flow. The marker is used to identify such
> packet in driver so the driver could set SKB PSP metadata. The destination
> of RX error flow table is the TTC UDP default RSS TIR. The second rule will
> drop packets that failed to be decrypted (like in case illegal SPI or
> expired SPI is used).
> 
> Signed-off-by: Raed Salem <raeds@...dia.com>
> Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>