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/* RLC Window (DL TBF), 3GPP TS 44.060
*
* Copyright (C) 2012 Ivan Klyuchnikov
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
* Copyright (C) 2023 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* 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.
*/
#pragma once
#include "rlc.h"
#include "rlc_window.h"
enum gprs_rlc_dl_bsn_state {
GPRS_RLC_DL_BSN_INVALID,
GPRS_RLC_DL_BSN_NACKED,
GPRS_RLC_DL_BSN_ACKED,
GPRS_RLC_DL_BSN_UNACKED,
GPRS_RLC_DL_BSN_RESEND,
GPRS_RLC_DL_BSN_MAX,
};
/**
* TODO: for GPRS/EDGE maybe make sns a template parameter
* so we create specialized versions...
*/
struct gprs_rlc_v_b {
/* Check for an individual frame */
bool is_unacked(int bsn) const;
bool is_nacked(int bsn) const;
bool is_acked(int bsn) const;
bool is_resend(int bsn) const;
bool is_invalid(int bsn) const;
gprs_rlc_dl_bsn_state get_state(int bsn) const;
/* Mark a RLC frame for something */
void mark_unacked(int bsn);
void mark_nacked(int bsn);
void mark_acked(int bsn);
void mark_resend(int bsn);
void mark_invalid(int bsn);
void reset(void);
private:
bool is_state(int bsn, const gprs_rlc_dl_bsn_state state) const;
void mark(int bsn, const gprs_rlc_dl_bsn_state state);
gprs_rlc_dl_bsn_state m_v_b[RLC_MAX_SNS/2]; /* acknowledge state array */
};
inline bool gprs_rlc_v_b::is_state(int bsn, const gprs_rlc_dl_bsn_state type) const
{
return m_v_b[bsn & mod_sns_half()] == type;
}
inline void gprs_rlc_v_b::mark(int bsn, const gprs_rlc_dl_bsn_state type)
{
m_v_b[bsn & mod_sns_half()] = type;
}
inline bool gprs_rlc_v_b::is_nacked(int bsn) const
{
return is_state(bsn, GPRS_RLC_DL_BSN_NACKED);
}
inline bool gprs_rlc_v_b::is_acked(int bsn) const
{
return is_state(bsn, GPRS_RLC_DL_BSN_ACKED);
}
inline bool gprs_rlc_v_b::is_unacked(int bsn) const
{
return is_state(bsn, GPRS_RLC_DL_BSN_UNACKED);
}
inline bool gprs_rlc_v_b::is_resend(int bsn) const
{
return is_state(bsn, GPRS_RLC_DL_BSN_RESEND);
}
inline bool gprs_rlc_v_b::is_invalid(int bsn) const
{
return is_state(bsn, GPRS_RLC_DL_BSN_INVALID);
}
inline gprs_rlc_dl_bsn_state gprs_rlc_v_b::get_state(int bsn) const
{
return m_v_b[bsn & mod_sns_half()];
}
inline void gprs_rlc_v_b::mark_resend(int bsn)
{
return mark(bsn, GPRS_RLC_DL_BSN_RESEND);
}
inline void gprs_rlc_v_b::mark_unacked(int bsn)
{
return mark(bsn, GPRS_RLC_DL_BSN_UNACKED);
}
inline void gprs_rlc_v_b::mark_acked(int bsn)
{
return mark(bsn, GPRS_RLC_DL_BSN_ACKED);
}
inline void gprs_rlc_v_b::mark_nacked(int bsn)
{
return mark(bsn, GPRS_RLC_DL_BSN_NACKED);
}
inline void gprs_rlc_v_b::mark_invalid(int bsn)
{
return mark(bsn, GPRS_RLC_DL_BSN_INVALID);
}
struct gprs_rlc_dl_window : public gprs_rlc_window {
void reset(void);
bool window_stalled(void) const;
bool window_empty(void) const;
void increment_send(void);
void raise(int moves);
const uint16_t v_s(void) const;
const uint16_t v_s_mod(int offset) const;
const uint16_t v_a(void) const;
const uint16_t distance(void) const;
/* Methods to manage reception */
int resend_needed(void) const;
int mark_for_resend(void);
void update(struct gprs_rlcmac_bts *bts, char *show_rbb, uint16_t ssn,
uint16_t *lost, uint16_t *received);
void update(struct gprs_rlcmac_bts *bts, const struct bitvec *rbb,
uint16_t first_bsn, uint16_t *lost,
uint16_t *received);
int move_window(void);
void show_state(char *show_v_b);
int count_unacked(void);
uint16_t m_v_s; /* send state */
uint16_t m_v_a; /* ack state */
gprs_rlc_v_b m_v_b;
gprs_rlc_dl_window(void);
};
inline gprs_rlc_dl_window::gprs_rlc_dl_window(void)
: m_v_s(0)
, m_v_a(0)
{
reset();
}
inline const uint16_t gprs_rlc_dl_window::v_s(void) const
{
return m_v_s;
}
inline const uint16_t gprs_rlc_dl_window::v_s_mod(int offset) const
{
return mod_sns(m_v_s + offset);
}
inline const uint16_t gprs_rlc_dl_window::v_a(void) const
{
return m_v_a;
}
inline bool gprs_rlc_dl_window::window_stalled(void) const
{
return (mod_sns(m_v_s - m_v_a)) == ws();
}
inline bool gprs_rlc_dl_window::window_empty(void) const
{
return m_v_s == m_v_a;
}
inline void gprs_rlc_dl_window::increment_send(void)
{
m_v_s = (m_v_s + 1) & mod_sns();
}
inline void gprs_rlc_dl_window::raise(int moves)
{
m_v_a = (m_v_a + moves) & mod_sns();
}
inline const uint16_t gprs_rlc_dl_window::distance(void) const
{
return (m_v_s - m_v_a) & mod_sns();
}
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