netdev - Re: [PATCH net-next v3 3/3] skbuff: Optimization of SKB coalescing for page pool

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Date: Tue, 28 Nov 2023 18:41:54 +0800
From: Liang Chen <liangchen.linux@...il.com>
To: Yunsheng Lin <linyunsheng@...wei.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, 
	pabeni@...hat.com, hawk@...nel.org, ilias.apalodimas@...aro.org, 
	netdev@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH net-next v3 3/3] skbuff: Optimization of SKB coalescing
 for page pool

On Mon, Nov 27, 2023 at 6:48 PM Yunsheng Lin <linyunsheng@...wei.com> wrote:
>
> On 2023/11/27 12:23, Liang Chen wrote:
> > On Sat, Nov 25, 2023 at 8:16 PM Yunsheng Lin <linyunsheng@...wei.com> wrote:
> >>
> >> On 2023/11/24 15:34, Liang Chen wrote:
> >>
> >> ...
> >>
> >>> --- a/include/net/page_pool/helpers.h
> >>> +++ b/include/net/page_pool/helpers.h
> >>> @@ -402,4 +402,26 @@ static inline void page_pool_nid_changed(struct page_pool *pool, int new_nid)
> >>>               page_pool_update_nid(pool, new_nid);
> >>>  }
> >>>
> >>> +static inline bool page_pool_is_pp_page(struct page *page)
> >>> +{
> >>
> >> We have a page->pp_magic checking in napi_pp_put_page() in skbuff.c already,
> >> it seems better to move it to skbuff.c or skbuff.h and use it for
> >> napi_pp_put_page() too, as we seem to have chosen to demux the page_pool
> >> owned page and non-page_pool owned page handling in the skbuff core.
> >>
> >> If we move it to skbuff.c or skbuff.h, we might need a better prefix than
> >> page_pool_* too.
> >>
> >
> > How about keeping the 'page_pool_is_pp_page' function in 'helper.h'
> > and letting 'skbbuff.c' use it? It seems like the function's logic is
> > better suited to be internal to the page pool, and it might be needed
> > outside of 'skbuff.c' in the future.
>
> Yes, we can always extend it outside of 'skbuff' if there is a need in
> the future.
>
> For now, maybe it makes more sense to export as litte as possible in the
> .h file mirroring the napi_pp_put_page().
>

Sure. will be done in v4. Thanks!

> > .
> >