netdev - Re: [PATCH net-next v2] page_pool: split types and declarations from page

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Date: Wed, 26 Jul 2023 08:50:49 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Duyck <alexander.duyck@...il.com>
Cc: Yunsheng Lin <linyunsheng@...wei.com>, Alexander Lobakin
 <aleksander.lobakin@...el.com>, davem@...emloft.net, pabeni@...hat.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Eric Dumazet
 <edumazet@...gle.com>, Wei Fang <wei.fang@....com>, Shenwei Wang
 <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>, NXP Linux Team
 <linux-imx@....com>, Sunil Goutham <sgoutham@...vell.com>, Geetha sowjanya
 <gakula@...vell.com>, Subbaraya Sundeep <sbhatta@...vell.com>, hariprasad
 <hkelam@...vell.com>, Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky
 <leon@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, John
 Fastabend <john.fastabend@...il.com>, Felix Fietkau <nbd@....name>, Lorenzo
 Bianconi <lorenzo@...nel.org>, Ryder Lee <ryder.lee@...iatek.com>, Shayne
 Chen <shayne.chen@...iatek.com>, Sean Wang <sean.wang@...iatek.com>, Kalle
 Valo <kvalo@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Ilias
 Apalodimas <ilias.apalodimas@...aro.org>, linux-rdma@...r.kernel.org,
 bpf@...r.kernel.org, linux-wireless@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next v2] page_pool: split types and declarations
 from page_pool.h

On Wed, 26 Jul 2023 08:39:43 -0700 Alexander Duyck wrote:
> > > I suppose the above suggestion is about splitting or naming by
> > > the user as the discussed in the below thread?
> > > https://lore.kernel.org/all/20230721182942.0ca57663@kernel.org/  
> >
> > Actually my suggestion is more about defining boundaries for what is
> > meant to be used by drivers and what isn't. The stuff you could keep
> > in net/core/page_pool.h would only be usable by the files in net/core/
> > whereas the stuff you are keeping in the include/net/ folder is usable
> > by drivers. It is meant to prevent things like what you were
> > complaining about with the Mellanox drivers making use of interfaces
> > you didn't intend them to use.

FWIW moving stuff which is only supposed to be used by core (xdp, skb,
etc.) to net/core/page_pool.h is a good idea, too. 
Seems a bit independent from splitting the main header, tho.

> > So for example you could pull out functions like
> > page_pool_return_skb_page, page_pool_use_xdp_mem,
> > page_pool_update_nid, and the like and look at relocating them into
> > the net/core/ folder and thereby prevent abuse of those functions by
> > drivers.  
> 
> Okay, maybe not page_pool_update_nid. It looks like that is already in
> use in the form of page_pool_nid_changed by drivers..