netdev - RE: [Intel-wired-lan] [PATCH iwl-next] ice: add a separate Rx handler for flow director commands

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Message-ID: <PH0PR11MB50951C507DD78731384B7A25D6DB2@PH0PR11MB5095.namprd11.prod.outlook.com>
Date: Fri, 21 Mar 2025 22:52:00 +0000
From: "Keller, Jacob E" <jacob.e.keller@...el.com>
To: "Kubiak, Michal" <michal.kubiak@...el.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC: "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, "Kubiak, Michal" <michal.kubiak@...el.com>,
	"Swiatkowski, Michal" <michal.swiatkowski@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH iwl-next] ice: add a separate Rx handler
 for flow director commands



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Michal
> Kubiak
> Sent: Friday, March 21, 2025 8:14 AM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Fijalkowski, Maciej <maciej.fijalkowski@...el.com>; netdev@...r.kernel.org;
> Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>; Kubiak, Michal
> <michal.kubiak@...el.com>; Swiatkowski, Michal
> <michal.swiatkowski@...el.com>
> Subject: [Intel-wired-lan] [PATCH iwl-next] ice: add a separate Rx handler for flow
> director commands
> 
> The "ice" driver implementation uses the control VSI to handle
> the flow director configuration for PFs and VFs.
> 
> Unfortunately, although a separate VSI type was created to handle flow
> director queues, the Rx queue handler was shared between the flow
> director and a standard NAPI Rx handler.
> 
> Such a design approach was not very flexible. First, it mixed hotpath
> and slowpath code, blocking their further optimization. It also created
> a huge overkill for the flow director command processing, which is
> descriptor-based only, so there is no need to allocate Rx data buffers.
> 
> For the above reasons, implement a separate Rx handler for the control
> VSI. Also, remove from the NAPI handler the code dedicated to
> configuring the flow director rules on VFs.
> Do not allocate Rx data buffers to the flow director queues because
> their processing is descriptor-based only.
> Finally, allow Rx data queues to be allocated only for VSIs that have
> netdev assigned to them.
> 
> This handler splitting approach is the first step in converting the
> driver to use the Page Pool (which can only be used for data queues).
> 
> Test hints:
>   1. Create a VF for any PF managed by the ice driver.
>   2. In a loop, add and delete flow director rules for the VF, e.g.:
> 
>        for i in {1..128}; do
>            q=$(( i % 16 ))
>            ethtool -N ens802f0v0 flow-type tcp4 dst-port "$i" action "$q"
>        done
> 
>        for i in {0..127}; do
>            ethtool -N ens802f0v0 delete "$i"
>        done
> 
> Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> Suggested-by: Michal Swiatkowski <michal.swiatkowski@...el.com>
> Acked-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> Signed-off-by: Michal Kubiak <michal.kubiak@...el.com>

This is a much cleaner approach!

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>