100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
/*
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* Copyright (C) 2013 by Holger Hans Peter Freyther
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "tbf.h"
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#include "bts.h"
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#include "gprs_debug.h"
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extern "C" {
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#include <osmocom/core/utils.h>
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}
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uint8_t *gprs_rlc_data::prepare(size_t block_data_len)
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{
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/* todo.. only set it once if it turns out to be a bottleneck */
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memset(block, 0x0, ARRAY_SIZE(block));
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memset(block, 0x2b, block_data_len);
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return block;
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}
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void gprs_rlc_v_b::reset()
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{
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for (size_t i = 0; i < ARRAY_SIZE(m_v_b); ++i)
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mark_invalid(i);
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}
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int gprs_rlc_v_b::resend_needed(const uint16_t v_a, const uint16_t v_s,
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const uint16_t mod_sns,
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const uint16_t mod_sns_half)
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{
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for (uint8_t bsn = v_a; bsn != v_s; bsn = (bsn + 1) & mod_sns) {
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uint16_t index = bsn & mod_sns_half;
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if (is_nacked(index) || is_resend(index))
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return bsn;
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}
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return -1;
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}
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int gprs_rlc_v_b::mark_for_resend(const uint16_t v_a, const uint16_t v_s,
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const uint16_t mod_sns,
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const uint16_t mod_sns_half)
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{
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int resend = 0;
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for (uint8_t bsn = v_a; bsn != v_s; bsn = (bsn + 1) & mod_sns) {
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uint16_t index = (bsn & mod_sns_half);
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if (is_unacked(index)) {
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/* mark to be re-send */
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mark_resend(index);
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resend += 1;
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}
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}
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return resend;
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}
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void gprs_rlc_v_b::update(BTS *bts, char *show_rbb, uint8_t ssn,
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const uint16_t v_a,
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const uint16_t mod_sns, const uint16_t mod_sns_half,
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uint16_t *lost, uint16_t *received)
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{
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uint16_t bsn;
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int i;
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/* SSN - 1 is in range V(A)..V(S)-1 */
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for (i = 63, bsn = (ssn - 1) & mod_sns;
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i >= 0 && bsn != ((v_a - 1) & mod_sns);
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i--, bsn = (bsn - 1) & mod_sns) {
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if (show_rbb[i] == '1') {
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LOGP(DRLCMACDL, LOGL_DEBUG, "- got ack for BSN=%d\n", bsn);
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if (!is_acked(bsn & mod_sns_half))
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*received += 1;
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mark_acked(bsn & mod_sns_half);
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} else {
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LOGP(DRLCMACDL, LOGL_DEBUG, "- got NACK for BSN=%d\n", bsn);
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mark_nacked(bsn & mod_sns_half);
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bts->rlc_nacked();
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*lost += 1;
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}
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}
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}
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