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From: Bui Quang Minh <>
To: Eric Dumazet <>,,
Subject: Re: [PATCH v2 1/2] udp: UDP socket send queue repair
Date: Thu, 12 Aug 2021 20:46:23 +0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 8/11/2021 11:14 PM, Eric Dumazet wrote:
> On 8/11/21 5:45 PM, Bui Quang Minh wrote:
>> In this patch, I implement UDP_REPAIR sockoption and a new path in
>> udp_recvmsg for dumping the corked packet in UDP socket's send queue.
>> A userspace program can use recvmsg syscall to get the packet's data and
>> the msg_name information of the packet. Currently, other related
>> information in inet_cork that are set in cmsg are not dumped.
>> While working on this, I was aware of Lese Doru Calin's patch and got some
>> ideas from it.
> What is the use case for this feature, adding a test in UDP fast path ?

This feature is used to help CRIU to dump CORKed UDP packet in send queue. I'm 
sorry for being not aware of the performance perspective here.

> IMO, TCP_REPAIR hijacking standard system calls was a design error,
> we should have added new system calls.

You are right that adding new system calls is a better approach. What do you 
think about adding a new option in getsockopt approach?

Quang Minh.

  reply	other threads:[~2021-08-12 13:46 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 15:45 Bui Quang Minh
2021-08-11 16:14 ` Eric Dumazet
2021-08-12 13:46   ` Bui Quang Minh [this message]
2021-08-12 15:51     ` Eric Dumazet
2021-08-13 11:08       ` Bui Quang Minh
2021-08-13 13:00         ` David Laight
2021-08-17 16:22           ` avagin
2021-08-16 14:35         ` Willem de Bruijn
2021-08-16 14:38 ` Willem de Bruijn

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