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/* Copied from tbf.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
* Copyright (C) 2013 by Holger Hans Peter Freyther
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <tbf.h>
#include <bts.h>
#include <stdio.h>
extern "C" {
#include <osmocom/core/msgb.h>
}
/* reset LLC frame */
void gprs_llc::reset()
{
m_index = 0;
m_length = 0;
}
void gprs_llc::reset_frame_space()
{
m_index = 0;
}
void gprs_llc::enqueue(struct msgb *llc_msg)
{
msgb_enqueue(&queue, llc_msg);
}
void gprs_llc::put_frame(const uint8_t *data, size_t len)
{
/* only put frames when we are empty */
OSMO_ASSERT(m_index == 0 && m_length == 0);
append_frame(data, len);
}
void gprs_llc::append_frame(const uint8_t *data, size_t len)
{
/* TODO: bounds check */
memcpy(frame + m_length, data, len);
m_length += len;
}
void gprs_llc::clear(BTS *bts)
{
struct msgb *msg;
while ((msg = msgb_dequeue(&queue))) {
bts->llc_dropped_frame();
msgb_free(msg);
}
}
void gprs_llc::init()
{
INIT_LLIST_HEAD(&queue);
reset();
}
struct msgb *gprs_llc::dequeue()
{
return msgb_dequeue(&queue);
}
void gprs_llc::calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, struct timeval *tv)
{
uint16_t delay_csec;
if (bts->bts_data()->force_llc_lifetime)
delay_csec = bts->bts_data()->force_llc_lifetime;
else
delay_csec = pdu_delay_csec;
/* keep timestap at 0 for infinite delay */
if (delay_csec == 0xffff) {
memset(tv, 0, sizeof(*tv));
return;
}
/* calculate timestamp of timeout */
struct timeval now, csec;
gettimeofday(&now, NULL);
csec.tv_usec = (delay_csec % 100) * 10000;
csec.tv_sec = delay_csec / 100;
timeradd(&now, &csec, tv);
}
bool gprs_llc::is_frame_expired(struct timeval *tv_now, struct timeval *tv)
{
/* Timeout is infinite */
if (tv->tv_sec == 0 && tv->tv_usec == 0)
return false;
return timercmp(tv_now, tv, >);
}
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