netdev - Re: [RFC PATCH v3 08/20] io_uring: add mmap support for shared ifq ringbuffers

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Date: Wed, 20 Dec 2023 09:13:30 -0700
From: Jens Axboe <axboe@...nel.dk>
To: David Wei <dw@...idwei.uk>, io-uring@...r.kernel.org,
 netdev@...r.kernel.org
Cc: 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>, David Ahern <dsahern@...nel.org>,
 Mina Almasry <almasrymina@...gle.com>
Subject: Re: [RFC PATCH v3 08/20] io_uring: add mmap support for shared ifq
 ringbuffers

On 12/19/23 2:03 PM, David Wei wrote:
> From: David Wei <davidhwei@...a.com>
> 
> This patch adds mmap support for ifq rbuf rings. There are two rings and
> a struct io_rbuf_ring that contains the head and tail ptrs into each
> ring.
> 
> Just like the io_uring SQ/CQ rings, userspace issues a single mmap call
> using the io_uring fd w/ magic offset IORING_OFF_RBUF_RING. An opaque
> ptr is returned to userspace, which is then expected to use the offsets
> returned in the registration struct to get access to the head/tail and
> rings.

Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe