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

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Message-ID: <DM6PR15MB2603BF2AA241ECB50ED6E167FA189@DM6PR15MB2603.namprd15.prod.outlook.com>
Date:   Wed, 23 Mar 2022 12:11:38 +0000
From:   Constantine Gavrilov <CONSTG@...ibm.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: io_uring_enter() with opcode IORING_OP_RECV ignores MSG_WAITALL in
 msg_flags

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.

-- 
----------------------------------------
Constantine Gavrilov
Storage Architect
Master Inventor
Tel-Aviv IBM Storage Lab
1 Azrieli Center, Tel-Aviv
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