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transport: Introduce method for fetching a deferred transmit time stamp. 

When a messages is sent with the DEFER_EVENT flag, the lower transport
code does not fetch the time stamp right away.  This patch introduces
a method that allows a second call to retrieve the waiting transmit
time stamp.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
master
Richard Cochran 2018-03-17 12:12:59 -07:00
parent e160bad721
commit 5f9163af4b
2 changed files with 24 additions and 0 deletions
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11
transport.c
View File

@ -66,6 +66,17 @@ int transport_sendto(struct transport *t, struct fdarray *fda,
return t->send(t, fda, event, 0, msg, len, &msg->address, &msg->hwts);
}
int transport_txts(struct transport *t, struct fdarray *fda,
struct ptp_message *msg)
{
int cnt, len = ntohs(msg->header.messageLength);
struct hw_timestamp *hwts = &msg->hwts;
unsigned char pkt[1600];
cnt = sk_receive(fda->fd[FD_EVENT], pkt, len, NULL, hwts, MSG_ERRQUEUE);
return cnt > 0 ? 0 : cnt;
}
int transport_physical_addr(struct transport *t, uint8_t *addr)
{
if (t->physical_addr) {

13
transport.h
View File

@ -101,6 +101,19 @@ int transport_peer(struct transport *t, struct fdarray *fda,
int transport_sendto(struct transport *t, struct fdarray *fda,
enum transport_event event, struct ptp_message *msg);
/**
* Fetches the transmit time stamp for a PTP message that was sent
* with the TRANS_DEFER_EVENT flag.
*
* @param t The transport.
* @param fda The array of descriptors filled in by transport_open.
* @param msg The message previously sent using transport_send(),
* transport_peer(), or transport_sendto().
* @return Zero on success, or negative value in case of an error.
*/
int transport_txts(struct transport *t, struct fdarray *fda,
struct ptp_message *msg);
/**
* Returns the transport's type.
*/