netdev - Re: [RFC net-next v2] netmem: replace __netmem_clear_lsb() with netmem_to

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Message-ID: <20250811042306.GA41974@system.software.com>
Date: Mon, 11 Aug 2025 13:23:06 +0900
From: Byungchul Park <byungchul@...com>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel_team@...ynix.com, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, horms@...nel.org,
	almasrymina@...gle.com, hawk@...nel.org, toke@...hat.com
Subject: Re: [RFC net-next v2] netmem: replace __netmem_clear_lsb() with
 netmem_to_nmdesc()

On Sun, Aug 10, 2025 at 08:39:42PM +0100, Pavel Begunkov wrote:
> On 7/29/25 11:41, Byungchul Park wrote:
> > Changes from RFC:
> >       1. Optimize the implementation of netmem_to_nmdesc to use less
> >          instructions (feedbacked by Pavel)
> > 
> > ---8<---
> >  From 6a0dbaecbf9a2425afe73565914eaa762c5d15c8 Mon Sep 17 00:00:00 2001
> > From: Byungchul Park <byungchul@...com>
> > Date: Tue, 29 Jul 2025 19:34:12 +0900
> > Subject: [RFC net-next v2] netmem: replace __netmem_clear_lsb() with netmem_to_nmdesc()
> > 
> > Now that we have struct netmem_desc, it'd better access the pp fields
> > via struct netmem_desc rather than struct net_iov.
> > 
> > Introduce netmem_to_nmdesc() for safely converting netmem_ref to
> > netmem_desc regardless of the type underneath e.i. netmem_desc, net_iov.
> > 
> > While at it, remove __netmem_clear_lsb() and make netmem_to_nmdesc()
> > used instead.
> 
> I'll ultimately need this in another tree as indicated in the
> original diff, so I'll take it into a branch and send it out

Just curious.  What is the original diff?

	Byungchul

> with other patches.
> 
> --
> Pavel Begunkov