netdev - Re: [RFC PATCH v3 10/12] tcp: RX path for devmem TCP

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Date: Mon, 6 Nov 2023 16:02:42 -0800
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: David Ahern <dsahern@...nel.org>
Cc: Stanislav Fomichev <sdf@...gle.com>, Mina Almasry <almasrymina@...gle.com>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, linux-media@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, Shuah Khan <shuah@...nel.org>, Sumit Semwal <sumit.semwal@...aro.org>, 
	Christian König <christian.koenig@....com>, 
	Shakeel Butt <shakeelb@...gle.com>, Jeroen de Borst <jeroendb@...gle.com>, 
	Praveen Kaligineedi <pkaligineedi@...gle.com>, Willem de Bruijn <willemb@...gle.com>, 
	Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH v3 10/12] tcp: RX path for devmem TCP

On Mon, Nov 6, 2023 at 3:55 PM David Ahern <dsahern@...nel.org> wrote:
>
> On 11/6/23 4:32 PM, Stanislav Fomichev wrote:
> >> The concise notification API returns tokens as a range for
> >> compression, encoding as two 32-bit unsigned integers start + length.
> >> It allows for even further batching by returning multiple such ranges
> >> in a single call.
> >
> > Tangential: should tokens be u64? Otherwise we can't have more than
> > 4gb unacknowledged. Or that's a reasonable constraint?
> >
>
> Was thinking the same and with bits reserved for a dmabuf id to allow
> multiple dmabufs in a single rx queue (future extension, but build the
> capability in now). e.g., something like a 37b offset (128GB dmabuf
> size), 19b length (large GRO), 8b dmabuf id (lots of dmabufs to a queue).

Agreed. Converting to 64b now sounds like a good forward looking revision.