netdev - Re: [PATCH v2 net-next 1/6] sfc: add fallback action-set-lists for TC offload

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Date: Fri, 9 Jun 2023 11:37:20 +0200
From: Simon Horman <simon.horman@...igine.com>
To: edward.cree@....com
Cc: linux-net-drivers@....com, davem@...emloft.net, kuba@...nel.org,
	pabeni@...hat.com, edumazet@...gle.com,
	Edward Cree <ecree.xilinx@...il.com>, netdev@...r.kernel.org,
	habetsm.xilinx@...il.com,
	Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
Subject: Re: [PATCH v2 net-next 1/6] sfc: add fallback action-set-lists for
 TC offload

On Thu, Jun 08, 2023 at 05:42:30PM +0100, edward.cree@....com wrote:
> From: Edward Cree <ecree.xilinx@...il.com>
> 
> When offloading a TC encap action, the action information for the
>  hardware might not be "ready": if there's currently no neighbour entry
>  available for the destination address, we can't construct the Ethernet
>  header to prepend to the packet.  In this case, we still offload the
>  flow rule, but with its action-set-list ID pointing at a "fallback"
>  action which simply delivers the packet to its default destination (as
>  though no flow rule had matched), thus allowing software TC to handle
>  it.  Later, when we receive a neighbouring update that allows us to
>  construct the encap header, the rule will become "ready" and we will
>  update its action-set-list ID in hardware to point at the actual
>  offloaded actions.
> This patch sets up these fallback ASLs, but does not yet use them.
> 
> Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
> Signed-off-by: Edward Cree <ecree.xilinx@...il.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>