netdev - Re: [PATCH v1 00/15] io

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Message-ID: <beb6e864-99a8-4ac5-b709-f764b1bcd7e4@kernel.org>
Date: Wed, 9 Oct 2024 11:19:50 -0600
From: David Ahern <dsahern@...nel.org>
To: Mina Almasry <almasrymina@...gle.com>, David Wei <dw@...idwei.uk>
Cc: io-uring@...r.kernel.org, netdev@...r.kernel.org,
 Jens Axboe <axboe@...nel.dk>, Pavel Begunkov <asml.silence@...il.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>
Subject: Re: [PATCH v1 00/15] io_uring zero copy rx

On 10/9/24 10:55 AM, Mina Almasry wrote:
> 
> I've been thinking about this a bit, and I hope this feedback isn't
> too late, but I think your work may be useful for users not using
> io_uring. I.e. zero copy to host memory that is not dependent on page
> aligned MSS sizing. I.e. AF_XDP zerocopy but using the TCP stack.

I disagree with this request; AF_XDP by definition is bypassing the
kernel stack.