netdev - RE: [Intel-wired-lan] [PATCH iwl-next v2 3/3] ice: switch to Page Pool

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Message-ID: <PH3PPF67C992ECC2B85C5436B969773E2759106A@PH3PPF67C992ECC.namprd11.prod.outlook.com>
Date: Tue, 2 Sep 2025 06:13:52 +0000
From: "Singh, PriyaX" <priyax.singh@...el.com>
To: "intel-wired-lan-bounces@...osl.org" <intel-wired-lan-bounces@...osl.org>
CC: "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>, "Lobakin,
 Aleksander" <aleksander.lobakin@...el.com>, "Keller, Jacob E"
	<jacob.e.keller@...el.com>, "Zaremba, Larysa" <larysa.zaremba@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, Paul Menzel <pmenzel@...gen.mpg.de>, "Nguyen,
 Anthony L" <anthony.l.nguyen@...el.com>, "Kubiak, Michal"
	<michal.kubiak@...el.com>, "Buvaneswaran, Sujai"
	<sujai.buvaneswaran@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH iwl-next v2 3/3] ice: switch to Page
 Pool

> This patch completes the transition of the ice driver to use the Page Pool and
> libeth APIs, following the same direction as commit 5fa4caff59f2
> ("iavf: switch to Page Pool"). With the legacy page splitting and recycling logic
> already removed, the driver is now in a clean state to adopt the modern
> memory model.
> 
> The Page Pool integration simplifies buffer management by offloading DMA
> mapping and recycling to the core infrastructure. This eliminates the need for
> driver-specific handling of headroom, buffer sizing, and page order. The libeth
> helper is used for CPU-side processing, while DMA-for-device is handled by
> the Page Pool core.
> 
> Additionally, this patch extends the conversion to cover XDP support.
> The driver now uses libeth_xdp helpers for Rx buffer processing, and
> optimizes XDP_TX by skipping per-frame DMA mapping. Instead, all buffers
> are mapped as bi-directional up front, leveraging Page Pool's lifecycle
> management. This significantly reduces overhead in virtualized environments.
> 
> Performance observations:
> - In typical scenarios (netperf, XDP_PASS, XDP_DROP), performance remains
>   on par with the previous implementation.
> - In XDP_TX mode:
>   * With IOMMU enabled, performance improves dramatically - over 5x
>     increase - due to reduced DMA mapping overhead and better memory
> reuse.
>   * With IOMMU disabled, performance remains comparable to the previous
>     implementation, with no significant changes observed.
> 
> This change is also a step toward a more modular and unified XDP
> implementation across Intel Ethernet drivers, aligning with ongoing efforts to
> consolidate and streamline feature support.
> 
> Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> Suggested-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> Signed-off-by: Michal Kubiak <michal.kubiak@...el.com>
> ---
>  drivers/net/ethernet/intel/Kconfig            |   1 +
>  drivers/net/ethernet/intel/ice/ice_base.c     |  85 ++--
>  drivers/net/ethernet/intel/ice/ice_ethtool.c  |  17 +-
>  drivers/net/ethernet/intel/ice/ice_lib.c      |   1 -
>  drivers/net/ethernet/intel/ice/ice_main.c     |  10 +-
>  drivers/net/ethernet/intel/ice/ice_txrx.c     | 443 +++---------------
>  drivers/net/ethernet/intel/ice/ice_txrx.h     |  33 +-
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.c |  65 ++-
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.h |   9 -
>  drivers/net/ethernet/intel/ice/ice_xsk.c      |  76 +--
>  drivers/net/ethernet/intel/ice/ice_xsk.h      |   6 +-
>  11 files changed, 200 insertions(+), 546 deletions(-)

Tested-by: Priya Singh <priyax.singh@...el.com>