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Date: Wed, 3 Jan 2024 17:47:20 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: Mina Almasry <almasrymina@...gle.com>
CC: Shakeel Butt <shakeelb@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<bpf@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar
	<mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, <x86@...nel.org>, "H. Peter Anvin"
	<hpa@...or.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J.
 Wysocki" <rafael@...nel.org>, Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>, Michael Chan
	<michael.chan@...adcom.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Alexei
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	<willemdebruijn.kernel@...il.com>
Subject: Re: [RFC PATCH net-next v1 4/4] net: page_pool: use netmem_t instead
 of struct page in API

On 2024/1/3 0:14, Mina Almasry wrote:
> 
> The idea being that skb_frag_page() can return NULL if the frag is not
> paged, and the relevant callers are modified to handle that.

There are many existing drivers which are not expecting NULL returning for
skb_frag_page() as those drivers are not supporting devmem, adding additionl
checking overhead in skb_frag_page() for those drivers does not make much
sense, IMHO, it may make more sense to introduce a new helper for the driver
supporting devmem or networking core that needing dealing with both normal
page and devmem.

And we are also able to keep the old non-NULL returning semantic for
skb_frag_page().

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