Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
osmo-pcu/src/llc.h

134 lines
3.5 KiB

/*
* 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.
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#include <osmocom/core/linuxlist.h>
#ifdef __cplusplus
}
#endif
#include <stdint.h>
#include <string.h>
#include <time.h>
#define LLC_MAX_LEN 1543
struct gprs_rlcmac_bts;
/**
* I represent the LLC data to a MS
*/
struct gprs_llc {
#ifdef __cplusplus
static bool is_user_data_frame(uint8_t *data, size_t len);
void init();
void reset();
void reset_frame_space();
void put_frame(const uint8_t *data, size_t len);
void put_dummy_frame(size_t req_len);
void append_frame(const uint8_t *data, size_t len);
#endif
uint8_t frame[LLC_MAX_LEN]; /* current DL or UL frame */
uint16_t m_index; /* current write/read position of frame */
uint16_t m_length; /* len of current DL LLC_frame, 0 == no frame */
};
struct MetaInfo {
struct timespec recv_time;
struct timespec expire_time;
};
/**
* I store the LLC frames that come from the SGSN.
*/
struct gprs_llc_queue {
#ifdef __cplusplus
static void calc_pdu_lifetime(struct gprs_rlcmac_bts *bts, const uint16_t pdu_delay_csec,
struct timespec *tv);
static bool is_frame_expired(const struct timespec *now,
const struct timespec *tv);
static bool is_user_data_frame(uint8_t *data, size_t len);
void enqueue(struct msgb *llc_msg, const struct timespec *expire_time);
struct msgb *dequeue(const MetaInfo **info = 0);
#endif
uint32_t m_avg_queue_delay; /* Average delay of data going through the queue */
size_t m_queue_size;
size_t m_queue_octets;
struct llist_head m_queue; /* queued LLC DL data */
};
#ifdef __cplusplus
extern "C" {
#endif
void llc_queue_init(struct gprs_llc_queue *q);
void llc_queue_clear(struct gprs_llc_queue *q, struct gprs_rlcmac_bts *bts);
void llc_queue_move_and_merge(struct gprs_llc_queue *q, struct gprs_llc_queue *o);
static inline uint16_t llc_chunk_size(const struct gprs_llc *llc)
{
return llc->m_length - llc->m_index;
}
static inline uint16_t llc_remaining_space(const struct gprs_llc *llc)
{
return LLC_MAX_LEN - llc->m_length;
}
static inline uint16_t llc_frame_length(const struct gprs_llc *llc)
{
return llc->m_length;
}
static inline void llc_consume(struct gprs_llc *llc, size_t len)
{
llc->m_index += len;
}
static inline void llc_consume_data(struct gprs_llc *llc, uint8_t *data, size_t len)
{
/* copy and increment index */
memcpy(data, llc->frame + llc->m_index, len);
llc_consume(llc, len);
}
static inline bool llc_fits_in_current_frame(const struct gprs_llc *llc, uint8_t chunk_size)
{
return llc->m_length + chunk_size <= LLC_MAX_LEN;
}
static inline size_t llc_queue_size(const struct gprs_llc_queue *q)
{
return q->m_queue_size;
}
static inline size_t llc_queue_octets(const struct gprs_llc_queue *q)
{
return q->m_queue_octets;
}
#ifdef __cplusplus
}
#endif