104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
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/**
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* @file tc.h
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* @brief Provides Transparent Clock logic.
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* @note Copyright (C) 2018 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA.
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*/
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#ifndef HAVE_TC_H
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#define HAVE_TC_H
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#include "msg.h"
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#include "port_private.h"
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/**
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* Flushes the list of remembered residence times.
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* @param q Port whose list should be flushed
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*/
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void tc_flush(struct port *q);
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/**
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* Forwards a given general message out all other ports.
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* @param q The ingress port
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* @param msg The message to be sent
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* @return Zero on success, non-zero otherwise.
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*/
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int tc_forward(struct port *q, struct ptp_message *msg);
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/**
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* Forwards a given Follow-Up message out all other ports.
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*
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* This function adds the unique, per egress port residence time into
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* the correction field for the transmitted follow up message.
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*
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* @param q The ingress port
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* @param msg The message to be sent
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* @return Zero on success, non-zero otherwise.
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*/
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int tc_fwd_folup(struct port *q, struct ptp_message *msg);
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/**
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* Forwards a given delay request message out all other ports.
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*
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* This function computes the unique residence time for each egress
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* port, remembering it in that egress port.
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*
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* @param q The ingress port
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* @param msg The message to be sent
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* @return Zero on success, non-zero otherwise.
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*/
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int tc_fwd_request(struct port *q, struct ptp_message *msg);
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/**
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* Forwards a given response message out all other ports.
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*
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* This function adds the unique, per egress port residence time into
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* the correction field for the transmitted delay response message.
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*
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* @param q The ingress port
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* @param msg The message to be sent
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* @return Zero on success, non-zero otherwise.
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*/
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int tc_fwd_response(struct port *q, struct ptp_message *msg);
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/**
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* Forwards a given sync message out all other ports.
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*
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* This function computes the unique residence time for each egress
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* port, remembering it in that egress port.
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*
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* @param q The ingress port
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* @param msg The message to be sent
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* @return Zero on success, non-zero otherwise.
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*/
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int tc_fwd_sync(struct port *q, struct ptp_message *msg);
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/**
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* Determines whether the local clock should ignore a given message.
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*
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* @param q The ingress port
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* @param msg The message to test
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* @return One if the message should be ignored, zero otherwise.
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*/
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int tc_ignore(struct port *q, struct ptp_message *m);
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/**
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* Prunes stale entries from the list of remembered residence times.
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* @param q Port whose list should be pruned.
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*/
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void tc_prune(struct port *q);
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#endif
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