netdev - Re: [PATCH v2 16/24] page_pool: Use netmem in page_pool_drain

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Date:   Tue, 10 Jan 2023 13:00:37 +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 16/24] page_pool: Use netmem in page_pool_drain_frag()

On Thu, Jan 05, 2023 at 09:46:23PM +0000, Matthew Wilcox (Oracle) wrote:
> We're not quite ready to change the API of page_pool_drain_frag(),
> but we can remove the use of several wrappers by using the netmem
> throughout.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  net/core/page_pool.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index c495e3a16e83..cd469a9970e7 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -672,17 +672,17 @@ static struct page *page_pool_drain_frag(struct page_pool *pool,
>  	long drain_count = BIAS_MAX - pool->frag_users;
>
>  	/* Some user is still using the page frag */
> -	if (likely(page_pool_defrag_page(page, drain_count)))
> +	if (likely(page_pool_defrag_netmem(nmem, drain_count)))
>  		return NULL;
>
> -	if (page_ref_count(page) == 1 && !page_is_pfmemalloc(page)) {
> +	if (netmem_ref_count(nmem) == 1 && !netmem_is_pfmemalloc(nmem)) {
>  		if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV)
>  			page_pool_dma_sync_for_device(pool, nmem, -1);
>
>  		return page;
>  	}
>
> -	page_pool_return_page(pool, page);
> +	page_pool_return_netmem(pool, nmem);
>  	return NULL;
>  }
>
> --
> 2.35.1
>

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