netdev - Re: [RFC PATCH net-next v6 09/15] memory-provider: dmabuf devmem memory provider

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Date: Tue, 5 Mar 2024 18:28:51 -0800
From: David Wei <dw@...idwei.uk>
To: 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,
 bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 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>,
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 Jesper Dangaard Brouer <hawk@...nel.org>,
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 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
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 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
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 <eddyz87@...il.com>, Song Liu <song@...nel.org>,
 Yonghong Song <yonghong.song@...ux.dev>,
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 Praveen Kaligineedi <pkaligineedi@...gle.com>,
 Willem de Bruijn <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH net-next v6 09/15] memory-provider: dmabuf devmem
 memory provider

On 2024-03-04 18:01, Mina Almasry wrote:
> +	if (pool->p.queue)
> +		binding = READ_ONCE(pool->p.queue->binding);
> +
> +	if (binding) {
> +		pool->mp_ops = &dmabuf_devmem_ops;
> +		pool->mp_priv = binding;
> +	}

This is specific to TCP devmem. For ZC Rx we will need something more
generic to let us pass our own memory provider backend down to the page
pool.

What about storing ops and priv void ptr in struct netdev_rx_queue
instead? Then we can both use it.