| /* |
| * 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 |