netdev - Re: [PATCH v2 09/24] page_pool: Convert page_pool_defrag_page() to page_pool_defrag

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Date:   Tue, 10 Jan 2023 12:27:25 +0200
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Jesper Dangaard Brouer <hawk@...nel.org>, netdev@...r.kernel.org,
        linux-mm@...ck.org, Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH v2 09/24] page_pool: Convert page_pool_defrag_page() to
 page_pool_defrag_netmem()

On Thu, Jan 05, 2023 at 09:46:16PM +0000, Matthew Wilcox (Oracle) wrote:
> Add a page_pool_defrag_page() wrapper.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  include/net/page_pool.h | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/include/net/page_pool.h b/include/net/page_pool.h
> index 63aa530922de..8fe494166427 100644
> --- a/include/net/page_pool.h
> +++ b/include/net/page_pool.h
> @@ -393,7 +393,7 @@ static inline void page_pool_fragment_page(struct page *page, long nr)
>  	atomic_long_set(&page->pp_frag_count, nr);
>  }
>
> -static inline long page_pool_defrag_page(struct page *page, long nr)
> +static inline long page_pool_defrag_netmem(struct netmem *nmem, long nr)
>  {
>  	long ret;
>
> @@ -406,14 +406,19 @@ static inline long page_pool_defrag_page(struct page *page, long nr)
>  	 * especially when dealing with a page that may be partitioned
>  	 * into only 2 or 3 pieces.
>  	 */
> -	if (atomic_long_read(&page->pp_frag_count) == nr)
> +	if (atomic_long_read(&nmem->pp_frag_count) == nr)
>  		return 0;
>
> -	ret = atomic_long_sub_return(nr, &page->pp_frag_count);
> +	ret = atomic_long_sub_return(nr, &nmem->pp_frag_count);
>  	WARN_ON(ret < 0);
>  	return ret;
>  }
>
> +static inline long page_pool_defrag_page(struct page *page, long nr)
> +{
> +	return page_pool_defrag_netmem(page_netmem(page), nr);
> +}
> +
>  static inline bool page_pool_is_last_frag(struct page_pool *pool,
>  					  struct page *page)
>  {
> --
> 2.35.1
>

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>