linux-kernel - Re: io_uring_enter() with opcode IORING_OP_RECV ignores MSG_WAITALL in msg

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Date:   Wed, 23 Mar 2022 06:19:03 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Constantine Gavrilov <CONSTG@...ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     io-uring <io-uring@...r.kernel.org>
Subject: Re: io_uring_enter() with opcode IORING_OP_RECV ignores MSG_WAITALL
 in msg_flags

On 3/23/22 4:31 AM, Constantine Gavrilov wrote:
> I get partial receives on TCP socket, even though I specify
> MSG_WAITALL with IORING_OP_RECV opcode. Looking at tcpdump in
> wireshark, I see entire reassambled packet (+4k), so it is not a
> disconnect. The MTU is smaller than 4k.
> 
> From the mailing list history, looks like this was discussed before
> and it seems the fix was supposed to be in. Can someone clarify the
> expected behavior?
> 
> I do not think rsvmsg() has this issue.

Do you have a test case? I added the io-uring list, that's the
appropriate forum for this kind of discussion.

-- 
Jens Axboe