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net: socket infrastructure for SO_TIMESTAMPING

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The overlap with the old SO_TIMESTAMP[NS] options is handled so
that time stamping in software (net_enable_timestamp()) is
enabled when SO_TIMESTAMP[NS] and/or SO_TIMESTAMPING_RX_SOFTWARE
is set.  It's disabled if all of these are off.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick Ohly 2009-02-12 05:03:38 +00:00 • committed by David S. Miller
parent ac45f602ee
commit 20d4947353
4 changed files with 185 additions and 41 deletions
Download patch file Download diff file Expand all files Collapse all files

82
net/socket.c
View file

@ -545,6 +545,18 @@ void sock_release(struct socket *sock)
sock->file = NULL;
}
int sock_tx_timestamp(struct msghdr *msg, struct sock *sk,
union skb_shared_tx *shtx)
{
shtx->flags = 0;
if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
shtx->hardware = 1;
if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
shtx->software = 1;
return 0;
}
EXPORT_SYMBOL(sock_tx_timestamp);
static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size)
{
@ -595,33 +607,65 @@ int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
return result;
}
static int ktime2ts(ktime_t kt, struct timespec *ts)
{
if (kt.tv64) {
*ts = ktime_to_timespec(kt);
return 1;
} else {
return 0;
}
}
/*
* 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;
int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
struct timespec ts[3];
int empty = 1;
struct skb_shared_hwtstamps *shhwtstamps =
skb_hwtstamps(skb);
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);
/* Race occurred between timestamp enabling and packet
receiving. Fill in the current time for now. */
if (need_software_tstamp && skb->tstamp.tv64 == 0)
__net_timestamp(skb);
if (need_software_tstamp) {
if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
struct timeval tv;
skb_get_timestamp(skb, &tv);
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
sizeof(tv), &tv);
} else {
struct timespec ts;
skb_get_timestampns(skb, &ts);
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
sizeof(ts), &ts);
}
}
memset(ts, 0, sizeof(ts));
if (skb->tstamp.tv64 &&
sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
skb_get_timestampns(skb, ts + 0);
empty = 0;
}
if (shhwtstamps) {
if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
ktime2ts(shhwtstamps->syststamp, ts + 1))
empty = 0;
if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
ktime2ts(shhwtstamps->hwtstamp, ts + 2))
empty = 0;
}
if (!empty)
put_cmsg(msg, SOL_SOCKET,
SCM_TIMESTAMPING, sizeof(ts), &ts);
}
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);