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Message-ID: <23be8495-53d1-469a-bd9d-4dc2295be71f@gmail.com>
Date: Tue, 13 Aug 2024 02:56:50 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Mina Almasry <almasrymina@...gle.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-alpha@...r.kernel.org, linux-mips@...r.kernel.org,
 linux-parisc@...r.kernel.org, sparclinux@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-kselftest@...r.kernel.org, bpf@...r.kernel.org,
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 Donald Hunter <donald.hunter@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Jonathan Corbet <corbet@....net>,
 Richard Henderson <richard.henderson@...aro.org>,
 Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner
 <mattst88@...il.com>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
 Helge Deller <deller@....de>, Andreas Larsson <andreas@...sler.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Arnd Bergmann <arnd@...db.de>,
 Steffen Klassert <steffen.klassert@...unet.com>,
 Herbert Xu <herbert@...dor.apana.org.au>, David Ahern <dsahern@...nel.org>,
 Willem de Bruijn <willemdebruijn.kernel@...il.com>,
 Shuah Khan <shuah@...nel.org>, Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 Bagas Sanjaya <bagasdotme@...il.com>, Christoph Hellwig <hch@...radead.org>,
 Nikolay Aleksandrov <razor@...ckwall.org>, Taehee Yoo <ap420073@...il.com>,
 David Wei <dw@...idwei.uk>, Jason Gunthorpe <jgg@...pe.ca>,
 Yunsheng Lin <linyunsheng@...wei.com>, Shailend Chand <shailend@...gle.com>,
 Harshitha Ramamurthy <hramamurthy@...gle.com>,
 Shakeel Butt <shakeel.butt@...ux.dev>, Jeroen de Borst
 <jeroendb@...gle.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>,
 Willem de Bruijn <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [PATCH net-next v18 07/14] memory-provider: dmabuf devmem memory
 provider

On 8/13/24 01:15, Jakub Kicinski wrote:
> On Mon, 12 Aug 2024 20:04:41 +0100 Pavel Begunkov wrote:
>>>> Also don't see the upside of the explicit "non-capable" flag,
>>>> but I haven't thought of that. Is there any use?
>>
>> Or maybe I don't get what you're asking, I explained
>> why to have that "PP_IGNORE_PROVIDERS" on top of the flag
>> saying that it's supported.
>>
>> Which "non-capable" flag you have in mind? A page pool create
>> flag or one facing upper layers like devmem tcp?
> 
> Let me rephrase - what's the point of having both PP_PROVIDERS_SUPPORTED
> and PP_IGNORE_PROVIDERS at the page pool level? PP_CAP_NET(MEM|IOV),
> and it's either there or it's not.

The second flag solves a problem with initializing page pools
with headers, but let's forget about it for now, it's rather a
small nuance, would probably reappear when someone would try to
use pp_params->queue for purposes different from memory providers.

> If you're thinking about advertising the support all the way to the
> user, I'm not sure if page pool is the right place to do so. It's more
> of a queue property.

Nope. Only the first "SUPPORTED" flag serves that purpose in a way
by failing setup like netlink devmem dmabuf binding and returning
the error back to user.

> BTW, Mina, the core should probably also check that XDP isn't installed
> before / while the netmem is bound to a queue.

-- 
Pavel Begunkov

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