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Date: Mon, 14 Apr 2014 20:43:26 -0400 From: Neal Cardwell <ncardwell@...gle.com> To: Kenjiro Nakayama <nakayamakenjiro@...il.com> Cc: LKML <linux-kernel@...r.kernel.org>, Netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com>, Eric Dumazet <edumazet@...gle.com> Subject: Re: [PATCH] ipv4: Add option to get TCP_FASTOPEN to getsockopt() On Mon, Apr 14, 2014 at 1:39 PM, Kenjiro Nakayama <nakayamakenjiro@...il.com> wrote: > TCP_FASTOPEN option can be set via setsockopt(), but the value cannot be > gotten via getsockopt(). This patch adds the option to getsockopt(). > > Sighned-off-by: Kenjiro Nakayama <nakayamakenjiro@...il.com> > > Add option to get TCP_FASTOPEN to getsockopt() > --- > net/ipv4/tcp.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c > index 4bd6d52..6ccdbcc 100644 > --- a/net/ipv4/tcp.c > +++ b/net/ipv4/tcp.c > @@ -2916,6 +2916,11 @@ static int do_tcp_getsockopt(struct sock *sk, int level, > case TCP_USER_TIMEOUT: > val = jiffies_to_msecs(icsk->icsk_user_timeout); > break; > + > + case TCP_FASTOPEN: > + val = sysctl_tcp_fastopen; > + break; > + > case TCP_TIMESTAMP: > val = tcp_time_stamp + tp->tsoffset; > break; > -- > 1.9.0 Hi, Please cc the Linux network development mailing list at netdev@...r.kernel.org (cc-ed) for Linux networking patches like this. I don't think this is the implementation we'd want for a getsockopt() for TCP_FASTOPEN. I imagine that since the setsockopt(TCP_FASTOPEN) enables Fast Open on a listening socket with a given backlog, if we add a corresponding getsockopt() then it should return that Fast Open backlog if Fast Open is enabled on the listening socket, or 0 otherwise. That is, basically it would be querying whether fastopen_init_queue() has been run and returning fastopenq->max_qlen if so. That way setsockopt(TCP_FASTOPEN, getsockopt(TCP_FASTOPEN)) will be a NOP in most cases, as one would expect. neal -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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