netdev - Re: [PATCH net-next] net/mlx5e: Transmit small messages in linear skb

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Message-ID: <CANn89iLnG4qkFR0mH_BN07BXGdYjBD_TzAYjB4nLtG2_SVYdFQ@mail.gmail.com>
Date: Fri, 6 Dec 2024 17:35:21 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: David Laight <David.Laight@...lab.com>
Cc: Alexandra Winter <wintera@...ux.ibm.com>, Rahul Rameshbabu <rrameshbabu@...dia.com>, 
	Saeed Mahameed <saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>, Leon Romanovsky <leon@...nel.org>, 
	David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Andrew Lunn <andrew+netdev@...n.ch>, Nils Hoppmann <niho@...ux.ibm.com>, 
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, 
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>, Heiko Carstens <hca@...ux.ibm.com>, 
	Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev <agordeev@...ux.ibm.com>, 
	Christian Borntraeger <borntraeger@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, 
	Thorsten Winkler <twinkler@...ux.ibm.com>, Simon Horman <horms@...nel.org>
Subject: Re: [PATCH net-next] net/mlx5e: Transmit small messages in linear skb

On Fri, Dec 6, 2024 at 3:48 PM David Laight <David.Laight@...lab.com> wrote:
>
> I've also wondered whether the ethernet driver could 'hold' the
> iommu page table entries after (eg) a receive frame is processed
> and then drop the PA of the replacement buffer into the same slot.
> That is likely to speed up iommu setup.

This has been done a long time ago (Alexander Duyck page refcount
trick in Intel drivers)

Then put into generic page_pool

https://static.lwn.net/kerneldoc/networking/page_pool.html