netdev - Re: [RFC PATCH net-next v1 4/4] net: page_pool: use netmem

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Message-ID: <fda068d0-f7fb-90fc-cdd6-1f853a4a225f@huawei.com>
Date: Wed, 3 Jan 2024 17:47:20 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: Mina Almasry <almasrymina@...gle.com>
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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().