netdev - Re: [PATCH net-next 5/9] page_pool: don't use driver-set flags field directly

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Message-ID: <20230803090029.16a6798d@kernel.org>
Date: Thu, 3 Aug 2023 09:00:29 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: Yunsheng Lin <linyunsheng@...wei.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
 Larysa Zaremba <larysa.zaremba@...el.com>, Alexander Duyck
 <alexanderduyck@...com>, Jesper Dangaard Brouer <hawk@...nel.org>, "Ilias
 Apalodimas" <ilias.apalodimas@...aro.org>, Simon Horman
 <simon.horman@...igine.com>, <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 5/9] page_pool: don't use driver-set flags
 field directly

On Thu, 3 Aug 2023 16:56:22 +0200 Alexander Lobakin wrote:
> > FWIW I'm tempted to do something like the patch below (an obvious move,
> > I suspect). I want to add another pointer (netdev) to the params and   
> 
> Just take napi->dev as I do in libie :)

:) The fields have extra semantics, like napi implies that recycling 
is allowed, and netdev implies that there is only _one_ netdev eating
from the PP. There's also a way to get the pp <> netdev from the memory
model registration. But I feel like explicit field is cleanest.

Anyone, conversation for a later time :)

> > I don't want it to eat up bytes in the first cache line.
> > The patch is incomplete, we need to stash a one-bit indication in 
> > the first cache line to know init_callback is not present without
> > having to look at @slow. I'll defer doing that cleanly until your
> > patches land.  
> 
> I would propose to include it in the series, but it has grown a bunch
> already and it's better to do that later separately :s

Yeah.. I'd be trying to split your series up a little to make progress
rather than add more things :( I was going to suggest that you post
just the first 3 patches for instance. Should be an easy merge.