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