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

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Date: Mon, 27 Nov 2023 18:48:39 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: Liang Chen <liangchen.linux@...il.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 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().

> .
>