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[NET]: Adding SO_TIMESTAMPNS / SCM_TIMESTAMPNS support

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Now that network timestamps use ktime_t infrastructure, we can add a new
SOL_SOCKET sockopt  SO_TIMESTAMPNS.

This command is similar to SO_TIMESTAMP, but permits transmission of
a 'timespec struct' instead of a 'timeval struct' control message.
(nanosecond resolution instead of microsecond)

Control message is labelled SCM_TIMESTAMPNS instead of SCM_TIMESTAMP

A socket cannot mix SO_TIMESTAMP and SO_TIMESTAMPNS : the two modes are
mutually exclusive.

sock_recv_timestamp() became too big to be fully inlined so I added a
__sock_recv_timestamp() helper function.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
CC: linux-arch@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2007-03-25 22:14:49 -07:00 • committed by David S. Miller
parent c7a3c5da35
commit 92f37fd2ee
25 changed files with 101 additions and 13 deletions
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29
net/socket.c
View file

@ -585,6 +585,35 @@ int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
return result;
}
/*
* called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
*/
void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb)
{
ktime_t kt = skb->tstamp;
if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
struct timeval tv;
/* Race occurred between timestamp enabling and packet
receiving. Fill in the current time for now. */
if (kt.tv64 == 0)
kt = ktime_get_real();
skb->tstamp = kt;
tv = ktime_to_timeval(kt);
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv);
} else {
struct timespec ts;
/* Race occurred between timestamp enabling and packet
receiving. Fill in the current time for now. */
if (kt.tv64 == 0)
kt = ktime_get_real();
skb->tstamp = kt;
ts = ktime_to_timespec(kt);
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts);
}
}
static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size, int flags)
{