153 lines
4.4 KiB
C
153 lines
4.4 KiB
C
/* 3GPP TS 44.064
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* Copyright (C) 2013 by Holger Hans Peter Freyther
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* Copyright (C) 2022 by by Sysmocom s.f.m.c. GmbH
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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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#pragma once
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#ifdef __cplusplus
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extern "C" {
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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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#include <osmocom/core/endian.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/endian.h>
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#include "gprs_codel.h"
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#define LLC_MAX_LEN 1543
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struct gprs_rlcmac_bts;
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struct GprsMs;
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struct gprs_llc_hdr {
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#if OSMO_IS_LITTLE_ENDIAN
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union { /* 5.2, 6.2.0 */
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uint8_t address;
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uint8_t sapi:4, unused:2, c_r:1, pd:1;
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#elif OSMO_IS_BIG_ENDIAN
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/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
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union {
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uint8_t address;
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uint8_t pd:1, c_r:1, unused:2, sapi:4;
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#endif
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};
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uint8_t control[0];
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} __attribute__ ((packed));
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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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uint8_t frame[LLC_MAX_LEN]; /* current DL or UL frame */
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uint16_t index; /* current write/read position of frame */
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uint16_t length; /* len of current DL LLC_frame, 0 == no frame */
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};
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bool llc_is_user_data_frame(const uint8_t *data, size_t len);
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void llc_init(struct gprs_llc *llc);
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void llc_reset(struct gprs_llc *llc);
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void llc_reset_frame_space(struct gprs_llc *llc);
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void llc_put_frame(struct gprs_llc *llc, const uint8_t *data, size_t len);
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void llc_put_dummy_frame(struct gprs_llc *llc, size_t req_len);
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void llc_append_frame(struct gprs_llc *llc, const uint8_t *data, size_t len);
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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->length - llc->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->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->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->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->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->length + chunk_size <= LLC_MAX_LEN;
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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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enum gprs_llc_queue_prio { /* lowest value has highest prio */
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LLC_QUEUE_PRIO_GMM = 0, /* SAPI 1 */
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LLC_QUEUE_PRIO_TOM_SMS, /* SAPI 2,7,8 */
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LLC_QUEUE_PRIO_OTHER, /* Other SAPIs */
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_LLC_QUEUE_PRIO_SIZE /* used to calculate size of enum */
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};
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struct gprs_llc_prio_queue {
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struct gprs_codel codel_state;
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struct llist_head queue; /* queued LLC DL data. See enum gprs_llc_queue_prio. */
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};
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struct gprs_llc_queue {
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struct GprsMs *ms; /* backpointer */
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uint32_t avg_queue_delay; /* Average delay of data going through the queue */
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size_t queue_size;
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size_t queue_octets;
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bool use_codel;
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struct gprs_llc_prio_queue pq[_LLC_QUEUE_PRIO_SIZE]; /* queued LLC DL data. See enum gprs_llc_queue_prio. */
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};
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void llc_queue_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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bool llc_queue_is_frame_expired(const struct timespec *tv_now, const struct timespec *tv);
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void llc_queue_init(struct gprs_llc_queue *q, struct GprsMs *ms);
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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_set_codel_interval(struct gprs_llc_queue *q, unsigned int interval);
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void llc_queue_move_and_merge(struct gprs_llc_queue *q, struct gprs_llc_queue *o);
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void llc_queue_enqueue(struct gprs_llc_queue *q, struct msgb *llc_msg, const struct timespec *expire_time);
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struct msgb *llc_queue_dequeue(struct gprs_llc_queue *q);
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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->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->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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