linux-kernel - Re: [PATCH] AF_UNIX: Implement SO_TIMESTAMP and SO

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Message-ID: <20101004194734.6a1caf3e@chocolatine.cbg.collabora.co.uk>
Date:	Mon, 4 Oct 2010 19:47:34 +0100
From:	Alban Crequy <alban.crequy@...labora.co.uk>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Lennart Poettering <lennart@...ttering.net>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Alban Crequy <alban.crequy@...labora.co.uk>
Subject: Re: [PATCH] AF_UNIX: Implement SO_TIMESTAMP and SO_TIMETAMPNS on 
 Unix sockets

Le Mon, 04 Oct 2010 20:09:49 +0200,
Eric Dumazet <eric.dumazet@...il.com> a écrit :

> Le lundi 04 octobre 2010 à 19:01 +0100, Alban Crequy a écrit :
> > Userspace applications can already request to receive timestamps
> > with: setsockopt(sockfd, SOL_SOCKET, SO_TIMESTAMP, ...)
> > 
> > Although setsockopt() returns zero (success), timestamps are not
> > added to the ancillary data. This patch fixes that on SOCK_DGRAM
> > and SOCK_SEQPACKET Unix sockets.
> > 
> > Signed-off-by: Alban Crequy <alban.crequy@...labora.co.uk>
> > ---
> >  net/unix/af_unix.c |    3 +++
> >  1 files changed, 3 insertions(+), 0 deletions(-)
> > 
> > diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> > index 617bea4..bca0c1e 100644
> > --- a/net/unix/af_unix.c
> > +++ b/net/unix/af_unix.c
> > @@ -1697,6 +1697,9 @@ static int unix_dgram_recvmsg(struct kiocb
> > *iocb, struct socket *sock, if (err)
> >  		goto out_free;
> >  
> > +	if (sock_flag(sk, SOCK_RCVTSTAMP))
> > +		__sock_recv_timestamp(msg, sk, skb);
> > +
> >  	if (!siocb->scm) {
> >  		siocb->scm = &tmp_scm;
> >  		memset(&tmp_scm, 0, sizeof(tmp_scm));
> 
> Hmm, but how is set skb->tstamp ?
> 
> I think its zero at this point, so __sock_recv_timestamp() use current
> time, not time of send().
> 
> gettimeofday() might be better/cheaper :)

You're right, I just tested it and it was the time of reception. Thanks
for the review.

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