linux-kernel - RE: [Intel-wired-lan] [PATCH iwl-next 0/5] idpf: add XSk support

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Message-ID: <DM4PR11MB64552622709ED75C9A0B136E981CA@DM4PR11MB6455.namprd11.prod.outlook.com>
Date: Wed, 24 Sep 2025 05:01:23 +0000
From: "R, Ramu" <ramu.r@...el.com>
To: "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC: "Lobakin, Aleksander" <aleksander.lobakin@...el.com>, "Kubiak, Michal"
	<michal.kubiak@...el.com>, "Fijalkowski, Maciej"
	<maciej.fijalkowski@...el.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, "Alexei
 Starovoitov" <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, "Simon
 Horman" <horms@...nel.org>, NXNE CNSE OSDT ITP Upstreaming
	<nxne.cnse.osdt.itp.upstreaming@...el.com>, "bpf@...r.kernel.org"
	<bpf@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH iwl-next 0/5] idpf: add XSk support

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Alexander Lobakin
> Sent: Thursday, September 11, 2025 9:52 PM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Lobakin, Aleksander <aleksander.lobakin@...el.com>; Kubiak, Michal
> <michal.kubiak@...el.com>; Fijalkowski, Maciej
> <maciej.fijalkowski@...el.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>; Kitszel, Przemyslaw
> <przemyslaw.kitszel@...el.com>; Andrew Lunn <andrew+netdev@...n.ch>;
> David S. Miller <davem@...emloft.net>; Eric Dumazet
> <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni
> <pabeni@...hat.com>; Alexei Starovoitov <ast@...nel.org>; Daniel
> Borkmann <daniel@...earbox.net>; Simon Horman <horms@...nel.org>;
> NXNE CNSE OSDT ITP Upstreaming
> <nxne.cnse.osdt.itp.upstreaming@...el.com>; bpf@...r.kernel.org;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH iwl-next 0/5] idpf: add XSk support
> 
> Add support for XSk xmit and receive using libeth_xdp.
> 
> This includes adding interfaces to reconfigure/enable/disable only a particular
> set of queues and support for checksum offload XSk Tx metadata.
> libeth_xdp's implementation mostly matches the one of ice: batched
> allocations and sending, unrolled descriptor writes etc. But unlike other Intel
> drivers, XSk wakeup is implemented using CSD/IPI instead of HW "software
> interrupt". In lots of different tests, this yielded way better perf than SW
> interrupts, but also, this gives better control over which CPU will handle the
> NAPI loop (SW interrupts are a subject to irqbalance and stuff, while CSDs are
> strictly pinned
> 1:1 to the core of the same index).
> Note that the header split is always disabled for XSk queues, as for now we
> see no reasons to have it there.
> 
> XSk xmit perf is up to 3x comparing to ice. XSk XDP_PASS is also faster a bunch
> as it uses system percpu page_pools, so that the only overlead left is
> memcpy(). The rest is at least comparable.
> 
> Alexander Lobakin (3):
>   idpf: implement XSk xmit
>   idpf: implement Rx path for AF_XDP
>   idpf: enable XSk features and ndo_xsk_wakeup
> 
> Michal Kubiak (2):
>   idpf: add virtchnl functions to manage selected queues
>   idpf: add XSk pool initialization
> 
>  drivers/net/ethernet/intel/idpf/Makefile      |    1 +
>  drivers/net/ethernet/intel/idpf/idpf.h        |    7 +
>  drivers/net/ethernet/intel/idpf/idpf_txrx.h   |   72 +-
>  .../net/ethernet/intel/idpf/idpf_virtchnl.h   |   32 +-
>  drivers/net/ethernet/intel/idpf/xdp.h         |    3 +
>  drivers/net/ethernet/intel/idpf/xsk.h         |   33 +
>  .../net/ethernet/intel/idpf/idpf_ethtool.c    |    8 +-
>  drivers/net/ethernet/intel/idpf/idpf_lib.c    |   10 +-
>  drivers/net/ethernet/intel/idpf/idpf_txrx.c   |  451 ++++++-
>  .../net/ethernet/intel/idpf/idpf_virtchnl.c   | 1160 +++++++++++------
>  drivers/net/ethernet/intel/idpf/xdp.c         |   44 +-
>  drivers/net/ethernet/intel/idpf/xsk.c         |  633 +++++++++
>  12 files changed, 1977 insertions(+), 477 deletions(-)  create mode 100644

Tested-by: Ramu R <ramu.r@...el.com>