netdev - Re: [PATCH net-next v6 3/4] skbuff: Add a function to check if a page belongs to page

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Date: Fri, 1 Dec 2023 12:22:58 +0200
From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
To: Liang Chen <liangchen.linux@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, 
	pabeni@...hat.com, hawk@...nel.org, linyunsheng@...wei.com, 
	netdev@...r.kernel.org, linux-mm@...ck.org, jasowang@...hat.com
Subject: Re: [PATCH net-next v6 3/4] skbuff: Add a function to check if a page
 belongs to page_pool

The second time is the charm, apologize for the noise.. resending it
as plain-text

On Thu, 30 Nov 2023 at 13:59, Liang Chen <liangchen.linux@...il.com> wrote:
>
> Wrap code for checking if a page is a page_pool page into a
> function for better readability and ease of reuse.
>
> Signed-off-by: Liang Chen <liangchen.linux@...il.com>
> Reviewed-by: Yunsheng Lin <linyunsheng@...wei.com>
> ---
>  net/core/skbuff.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index b157efea5dea..31e57c29c556 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -890,6 +890,11 @@ static void skb_clone_fraglist(struct sk_buff *skb)
>                 skb_get(list);
>  }
>
> +static bool skb_frag_is_pp_page(struct page *page)
> +{
> +       return (page->pp_magic & ~0x3UL) == PP_SIGNATURE;
> +}
> +

That's fine, but why _frag? The same logic applies to non-fragmented pages no?
So rename it to skb_from_pp()?

[...]

Thanks
/Ilias