/* Pack and send on event multicast ip adress a Sync message */
int msg_issue_sync_followup(struct pp_instance *ppi)
{
Timestamp tstamp;
TimeInternal now, *time_snt;
int e;
/* Send sync on the event channel with the "current" timestamp */
ppi->t_ops->get(ppi, &now);
from_TimeInternal(&now, &tstamp);
msg_pack_sync(ppi, &tstamp);
e = __send_and_log(ppi, PP_SYNC_LENGTH, PPM_SYNC, PP_NP_EVT);
if (e) return e;
/* Send followup on general channel with sent-stamp of sync */
time_snt = &ppi->last_snt_time;
add_TimeInternal(time_snt, time_snt,
&OPTS(ppi)->outbound_latency);
from_TimeInternal(time_snt, &tstamp);
msg_pack_follow_up(ppi, &tstamp);
return __send_and_log(ppi, PP_FOLLOW_UP_LENGTH, PPM_FOLLOW_UP,
PP_NP_GEN);
}
int pp_slave(struct pp_instance *ppi, unsigned char *pkt, int plen)
{
int e = 0; /* error var, to check errors in msg handling */
MsgHeader *hdr = &ppi->received_ptp_header;
MsgDelayResp resp;
int d1, d2;
if (ppi->is_new_state) {
pp_servo_init(ppi);
if (pp_hooks.new_slave)
e = pp_hooks.new_slave(ppi, pkt, plen);
if (e)
goto out;
ppi->waiting_for_follow = FALSE;
pp_timeout_restart_annrec(ppi);
pp_timeout_rand(ppi, PP_TO_DELAYREQ,
DSPOR(ppi)->logMinDelayReqInterval);
}
if (plen == 0)
goto out;
switch (hdr->messageType) {
case PPM_ANNOUNCE:
e = st_com_slave_handle_announce(ppi, pkt, plen);
break;
case PPM_SYNC:
e = st_com_slave_handle_sync(ppi, pkt, plen);
break;
case PPM_FOLLOW_UP:
e = st_com_slave_handle_followup(ppi, pkt, plen);
break;
case PPM_DELAY_REQ:
/* Being slave, we are not waiting for a delay request */
break;
case PPM_DELAY_RESP:
e = (plen < PP_DELAY_RESP_LENGTH);
if (e)
break;
msg_unpack_delay_resp(pkt, &resp);
if ((memcmp(&DSPOR(ppi)->portIdentity.clockIdentity,
&resp.requestingPortIdentity.clockIdentity,
PP_CLOCK_IDENTITY_LENGTH) == 0) &&
((ppi->sent_seq[PPM_DELAY_REQ]) ==
hdr->sequenceId) &&
(DSPOR(ppi)->portIdentity.portNumber ==
resp.requestingPortIdentity.portNumber)
&& ppi->is_from_cur_par) {
to_TimeInternal(&ppi->t4, &resp.receiveTimestamp);
/*
* FIXME: how is correctionField handled in t3/t4?
* I think the master should consider it when
* generating t4, and report back a modified t4
*/
if (pp_hooks.handle_resp)
e = pp_hooks.handle_resp(ppi);
else
pp_servo_got_resp(ppi);
if (e)
goto out;
ppi->log_min_delay_req_interval =
hdr->logMessageInterval;
} else {
pp_diag(ppi, frames, 2, "pp_slave : "
"Delay Resp doesn't match Delay Req\n");
}
break;
/*
* We are not supporting pdelay (not configured to, see
* 9.5.13.1, p 106), so all the code about pdelay is removed
* as a whole by one commit in our history. It can be recoverd
* and fixed if needed
*/
default:
/* disregard, nothing to do */
break;
}
out:
if (e == 0)
e = st_com_execute_slave(ppi);
if (pp_timeout_z(ppi, PP_TO_DELAYREQ)) {
e = msg_issue_delay_req(ppi);
ppi->t3 = ppi->last_snt_time;
/* Restart the timeout for next time */
pp_timeout_rand(ppi, PP_TO_DELAYREQ,
DSPOR(ppi)->logMinDelayReqInterval);
/* Add latency */
add_TimeInternal(&ppi->t3,
&ppi->t3,
&OPTS(ppi)->outbound_latency);
}
if (e) {
ppi->next_state = PPS_FAULTY;
return 0;
}
/* Leaving this state */
if (ppi->next_state != ppi->state) {
pp_timeout_clr(ppi, PP_TO_ANN_RECEIPT);
pp_timeout_clr(ppi, PP_TO_DELAYREQ);
pp_servo_init(ppi);
}
d1 = d2 = pp_ms_to_timeout(ppi, PP_TO_ANN_RECEIPT);
if (ppi->timeouts[PP_TO_DELAYREQ])
d2 = pp_ms_to_timeout(ppi, PP_TO_DELAYREQ);
ppi->next_delay = d1 < d2 ? d1 : d2;
return 0;
}
