From: Jens Axboe <axboe@kernel.dk>
To: norman.maurer@googlemail.com, io-uring@vger.kernel.org
Cc: Norman Maurer <norman_maurer@apple.com>
Subject: Re: [PATCH v2] io_uring/net: Support multishot receive len cap
Date: Tue, 15 Jul 2025 11:32:57 -0600 [thread overview]
Message-ID: <c2cf0c2b-b5bd-476f-a5d2-b5305ed6c3d9@kernel.dk> (raw)
In-Reply-To: <20250715140249.31186-1-norman_maurer@apple.com>
On 7/15/25 8:02 AM, norman.maurer@googlemail.com wrote:
> From: Norman Maurer <norman_maurer@apple.com>
>
> At the moment its very hard to do fine grained backpressure when using
> multishot as the kernel might produce a lot of completions before the
> user has a chance to cancel a previous submitted multishot recv.
>
> This change adds support to issue a multishot recv that is capped by a
> len, which means the kernel will only rearm until X amount of data is
> received. When the limit is reached the completion will signal to the
> user that a re-arm needs to happen manually by not setting the IORING_CQE_F_MORE
> flag.
I like this. Worth mentioning that there's already a test case for this
in liburing:
https://git.kernel.dk/cgit/liburing/tree/test/recv-mshot-fair.c
--
Jens Axboe
next prev parent reply other threads:[~2025-07-15 17:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-15 14:02 [PATCH v2] io_uring/net: Support multishot receive len cap norman.maurer
2025-07-15 17:32 ` Jens Axboe [this message]
2025-07-16 14:28 ` Jens Axboe
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