linux-kernel - RE: [Intel-wired-lan] [PATCH iwl-next v2 2/5] libeth: handle creating pools with unreadable buffers

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Message-ID: <LV1PR11MB87909472087A9DA0928B13569066A@LV1PR11MB8790.namprd11.prod.outlook.com>
Date: Fri, 6 Feb 2026 16:33:18 +0000
From: "Nowlin, Alexander" <alexander.nowlin@...el.com>
To: "Lobakin, Aleksander" <aleksander.lobakin@...el.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC: "Lobakin, Aleksander" <aleksander.lobakin@...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>, Simon Horman
	<horms@...nel.org>, "Keller, Jacob E" <jacob.e.keller@...el.com>, "Loktionov,
 Aleksandr" <aleksandr.loktionov@...el.com>, NXNE CNSE OSDT ITP Upstreaming
	<nxne.cnse.osdt.itp.upstreaming@...el.com>, "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 v2 2/5] libeth: handle creating
 pools with unreadable buffers

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Alexander Lobakin
> Sent: Thursday, December 4, 2025 7:52 AM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Lobakin, Aleksander <aleksander.lobakin@...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>; Simon Horman <horms@...nel.org>; Keller, Jacob E 
> <jacob.e.keller@...el.com>; Loktionov, Aleksandr <aleksandr.loktionov@...el.com>; NXNE CNSE OSDT ITP Upstreaming <nxne.cnse.osdt.itp.upstreaming@...el.com>; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH iwl-next v2 2/5] libeth: handle creating pools with unreadable buffers
> 
> libeth uses netmems for quite some time already, so in order to support unreadable frags / memory providers, it only needs to set PP_FLAG_ALLOW_UNREADABLE_NETMEM when needed.
> Also add a couple sanity checks to make sure the driver didn't mess up the configuration options and, in case when an MP is installed, return the truesize always equal to PAGE_SIZE, so that
> libeth_rx_alloc() will never try to allocate frags. Memory providers manage buffers on their own and expect 1:1 buffer / HW Rx descriptor association.
> 
> Bonus: mention in the libeth_sqe_type description that LIBETH_SQE_EMPTY should also be used for netmem Tx SQEs -- they don't need DMA unmapping.
> 
> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> ---
>  include/net/libeth/tx.h                |  2 +-
>  drivers/net/ethernet/intel/libeth/rx.c | 45 ++++++++++++++++++++++++++
>  2 files changed, 46 insertions(+), 1 deletion(-)

Tested-by: Alexander Nowlin <alexander.nowlin@...el.com>