netdev - Re: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE

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Date: Wed, 14 Jun 2023 10:19:54 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Yunsheng Lin <linyunsheng@...wei.com>
Cc: <davem@...emloft.net>, <pabeni@...hat.com>, <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, Lorenzo Bianconi <lorenzo@...nel.org>,
 Alexander Duyck <alexander.duyck@...il.com>, Yisen Zhuang
 <yisen.zhuang@...wei.com>, Salil Mehta <salil.mehta@...wei.com>, Eric
 Dumazet <edumazet@...gle.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>, Felix Fietkau <nbd@....name>, 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>, Jesper Dangaard Brouer
 <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>,
 <linux-rdma@...r.kernel.org>, <linux-wireless@...r.kernel.org>,
 <linux-arm-kernel@...ts.infradead.org>,
 <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG
 flag

On Mon, 12 Jun 2023 21:02:55 +0800 Yunsheng Lin wrote:
>  	struct page_pool_params pp_params = {
> -		.flags = PP_FLAG_DMA_MAP | PP_FLAG_PAGE_FRAG |
> -				PP_FLAG_DMA_SYNC_DEV,
> +		.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV,
>  		.order = hns3_page_order(ring),

Does hns3_page_order() set a good example for the users?

static inline unsigned int hns3_page_order(struct hns3_enet_ring *ring)
{
#if (PAGE_SIZE < 8192)
	if (ring->buf_size > (PAGE_SIZE / 2))
		return 1;
#endif
	return 0;
}

Why allocate order 1 pages for buffers which would fit in a single page?
I feel like this soft of heuristic should be built into the API itself.