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

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Message-ID: <CALvZod7-WsxLj8gdhu=FMfdunEDgBV+DwfOB2316NfXvf_K41g@mail.gmail.com>
Date: Fri, 15 Dec 2023 08:47:46 -0800
From: Shakeel Butt <shakeelb@...gle.com>
To: Yunsheng Lin <linyunsheng@...wei.com>
Cc: Mina Almasry <almasrymina@...gle.com>, 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>, 
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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 Fri, Dec 15, 2023 at 3:04 AM Yunsheng Lin <linyunsheng@...wei.com> wrote:
>
> On 2023/12/15 10:11, Shakeel Butt wrote:
> > On Thu, Dec 14, 2023 at 08:27:55AM -0800, Mina Almasry wrote:
> >> On Thu, Dec 14, 2023 at 4:05 AM Yunsheng Lin <linyunsheng@...wei.com> wrote:
> >>>
> > [...]
> >>> I perfer the second one personally, as devmem means that it is not
> >>> readable from cpu.
> >>
> >> From my POV it has to be the first one. We want to abstract the memory
> >> type from the drivers as much as possible, not introduce N new memory
> >> types and ask the driver to implement new code for each of them
> >> separately.
>
> That was my initial thinking too:
> https://www.spinics.net/lists/netdev/msg949376.html
>
> But after discussion, it may make more sense to have two sets of API from the
> driver's piont of view if we want a complete safe type protection, so that
> compiler can check everything statically and devmem driver API have a clear
> semantic:
> 1. devmem is not allowed to be called into mm subsystem.
> 2. it will not provide a API like page_address().
>

I think all of us are on the same page that there will be two sets of
APIs here but Mina's point was let's aim to not make that N set of
APIs.