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

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Message-ID: <ef987e32-f7ce-4b5a-82c4-8d89d5034afd@gmail.com>
Date: Sun, 10 Aug 2025 20:39:42 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Byungchul Park <byungchul@...com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: 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 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
with other patches.

-- 
Pavel Begunkov