netdev - Re: Is it possible to get Rx timestamps in skb->tstamp?

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Message-ID: <10302.1537364584@warthog.procyon.org.uk>
Date:   Wed, 19 Sep 2018 14:43:04 +0100
From:   David Howells <dhowells@...hat.com>
To:     Toke
         =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= <toke@...e.dk>
Cc:     dhowells@...hat.com, netdev@...r.kernel.org
Subject: Re: Is it possible to get Rx timestamps in skb->tstamp?

Toke Høiland-Jørgensen <toke@...e.dk> wrote:

> > Is it possible to tell a UDP socket that you'd like it to put
> > reception timestamps in skb->tstamp?
> 
> I think you probably want SO_TIMESTAMP*?
> 
> See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/networking/timestamping.txt

That seems to work.  I thought that only affected recvmsg() putting the
timestamp into the ancillary data buffer, but apparently not.

Thanks,
David