linuxptp/p2p_tc.c

232 lines
5.0 KiB
C

/**
* @file p2p_tc.c
* @note Copyright (C) 2018 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA.
*/
#include <errno.h>
#include "port.h"
#include "port_private.h"
#include "print.h"
#include "rtnl.h"
#include "tc.h"
static int p2p_delay_request(struct port *p)
{
switch (p->state) {
case PS_INITIALIZING:
case PS_FAULTY:
case PS_DISABLED:
return 0;
case PS_LISTENING:
case PS_PRE_MASTER:
case PS_MASTER:
case PS_PASSIVE:
case PS_UNCALIBRATED:
case PS_SLAVE:
case PS_GRAND_MASTER:
break;
}
return port_delay_request(p);
}
void p2p_dispatch(struct port *p, enum fsm_event event, int mdiff)
{
if (!port_state_update(p, event, mdiff)) {
return;
}
if (!portnum(p)) {
/* UDS needs no timers. */
return;
}
port_clr_tmo(p->fda.fd[FD_ANNOUNCE_TIMER]);
port_clr_tmo(p->fda.fd[FD_SYNC_RX_TIMER]);
/* Leave FD_DELAY_TIMER running. */
port_clr_tmo(p->fda.fd[FD_QUALIFICATION_TIMER]);
port_clr_tmo(p->fda.fd[FD_MANNO_TIMER]);
port_clr_tmo(p->fda.fd[FD_SYNC_TX_TIMER]);
/*
* Handle the side effects of the state transition.
*/
switch (p->state) {
case PS_INITIALIZING:
break;
case PS_FAULTY:
case PS_DISABLED:
port_disable(p);
break;
case PS_LISTENING:
port_set_announce_tmo(p);
port_set_delay_tmo(p);
break;
case PS_PRE_MASTER:
port_set_qualification_tmo(p);
break;
case PS_MASTER:
case PS_GRAND_MASTER:
break;
case PS_PASSIVE:
port_set_announce_tmo(p);
break;
case PS_UNCALIBRATED:
case PS_SLAVE:
port_set_announce_tmo(p);
break;
};
}
enum fsm_event p2p_event(struct port *p, int fd_index)
{
int cnt, fd = p->fda.fd[fd_index];
enum fsm_event event = EV_NONE;
struct ptp_message *msg, *dup;
switch (fd_index) {
case FD_ANNOUNCE_TIMER:
case FD_SYNC_RX_TIMER:
pr_debug("port %hu: %s timeout", portnum(p),
fd_index == FD_SYNC_RX_TIMER ? "rx sync" : "announce");
if (p->best) {
fc_clear(p->best);
}
port_set_announce_tmo(p);
return EV_ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES;
case FD_DELAY_TIMER:
pr_debug("port %hu: delay timeout", portnum(p));
port_set_delay_tmo(p);
tc_prune(p);
return p2p_delay_request(p) ? EV_FAULT_DETECTED : EV_NONE;
case FD_QUALIFICATION_TIMER:
pr_debug("port %hu: qualification timeout", portnum(p));
return EV_QUALIFICATION_TIMEOUT_EXPIRES;
case FD_MANNO_TIMER:
case FD_SYNC_TX_TIMER:
case FD_UNICAST_REQ_TIMER:
case FD_UNICAST_SRV_TIMER:
pr_err("unexpected timer expiration");
return EV_NONE;
case FD_RTNL:
pr_debug("port %hu: received link status notification", portnum(p));
rtnl_link_status(fd, p->name, port_link_status, p);
if (p->link_status == (LINK_UP|LINK_STATE_CHANGED)) {
return EV_FAULT_CLEARED;
} else if ((p->link_status == (LINK_DOWN|LINK_STATE_CHANGED)) ||
(p->link_status & TS_LABEL_CHANGED)) {
return EV_FAULT_DETECTED;
} else {
return EV_NONE;
}
}
msg = msg_allocate();
if (!msg) {
return EV_FAULT_DETECTED;
}
msg->hwts.type = p->timestamping;
cnt = transport_recv(p->trp, fd, msg);
if (cnt <= 0) {
pr_err("port %hu: recv message failed", portnum(p));
msg_put(msg);
return EV_FAULT_DETECTED;
}
if (msg_sots_valid(msg)) {
ts_add(&msg->hwts.ts, -p->rx_timestamp_offset);
}
if (msg_unicast(msg)) {
pl_warning(600, "cannot switch unicast messages!");
msg_put(msg);
return EV_NONE;
}
dup = msg_duplicate(msg, cnt);
if (!dup) {
msg_put(msg);
return EV_NONE;
}
if (tc_ignore(p, dup)) {
msg_put(dup);
dup = NULL;
}
switch (msg_type(msg)) {
case SYNC:
if (tc_fwd_sync(p, msg)) {
event = EV_FAULT_DETECTED;
break;
}
if (dup) {
process_sync(p, dup);
}
break;
case DELAY_REQ:
break;
case PDELAY_REQ:
if (dup && process_pdelay_req(p, dup)) {
event = EV_FAULT_DETECTED;
}
break;
case PDELAY_RESP:
if (dup && process_pdelay_resp(p, dup)) {
event = EV_FAULT_DETECTED;
}
break;
case FOLLOW_UP:
if (tc_fwd_folup(p, msg)) {
event = EV_FAULT_DETECTED;
break;
}
if (dup) {
process_follow_up(p, dup);
}
break;
case DELAY_RESP:
break;
case PDELAY_RESP_FOLLOW_UP:
if (dup) {
process_pdelay_resp_fup(p, dup);
}
break;
case ANNOUNCE:
if (tc_forward(p, msg)) {
event = EV_FAULT_DETECTED;
break;
}
if (dup && process_announce(p, dup)) {
event = EV_STATE_DECISION_EVENT;
}
break;
case SIGNALING:
case MANAGEMENT:
if (tc_forward(p, msg)) {
event = EV_FAULT_DETECTED;
}
break;
}
msg_put(msg);
if (dup) {
msg_put(dup);
}
return event;
}