netdev - Re: [RFC net-next 03/13] net: page

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Date: Thu, 17 Aug 2023 19:53:50 +0300
From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, hawk@...nel.org, aleksander.lobakin@...el.com, 
	linyunsheng@...wei.com, almasrymina@...gle.com
Subject: Re: [RFC net-next 03/13] net: page_pool: factor out uninit

On Thu, 17 Aug 2023 at 19:25, Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Thu, 17 Aug 2023 10:40:09 +0300 Ilias Apalodimas wrote:
> > > +static void page_pool_uninit(struct page_pool *pool)
> > > +{
> > > +       ptr_ring_cleanup(&pool->ring, NULL);
> > > +
> > > +       if (pool->p.flags & PP_FLAG_DMA_MAP)
> > > +               put_device(pool->p.dev);
> > > +
> > > +#ifdef CONFIG_PAGE_POOL_STATS
> > > +       free_percpu(pool->recycle_stats);
> > > +#endif
> > > +}
> >
> > I am not sure I am following the reasoning here.  The only extra thing
> > page_pool_free() does is disconnect the pool. So I assume no one will
> > call page_pool_uninit() directly.  Do you expect page_pool_free() to
> > grow in the future, so factoring out the uninit makes the code easier
> > to read?
>
> I'm calling it from the unwind patch of page_pool_create() in the next
> patch, because I'm adding another setup state after page_pool_init().
> I can't put the free into _uninit() because on the unwind path of
> _create() that's an individual step.

Yea fair enough, I went through that patch a few minutes ago, so this
one makes sense
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>