linux-kernel - Re: [PATCH net-next 5/9] page_pool: don't use driver-set flags field directly

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Message-ID: <a0be882e-558a-9b1d-7514-0aad0080e08c@huawei.com>
Date:   Fri, 28 Jul 2023 20:36:50 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Larysa Zaremba <larysa.zaremba@...el.com>,
        Alexander Duyck <alexanderduyck@...com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Simon Horman <simon.horman@...igine.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 5/9] page_pool: don't use driver-set flags field
 directly

On 2023/7/27 22:43, Alexander Lobakin wrote:

>  
>  struct page_pool {
>  	struct page_pool_params p;
> -	long pad;
> +
> +	bool dma_map:1;				/* Perform DMA mapping */
> +	enum {
> +		PP_DMA_SYNC_ACT_DISABLED = 0,	/* Driver didn't ask to sync */
> +		PP_DMA_SYNC_ACT_DO,		/* Perform DMA sync ops */
> +	} dma_sync_act:1;
> +	bool page_frag:1;			/* Allow page fragments */
>  

Isn't it more common or better to just remove the flags field in
'struct page_pool_params' and pass the flags by parameter like
below, so that patch 4 is not needed?

struct page_pool *page_pool_create(const struct page_pool_params *params,
				   unsigned int	flags);