135 lines
3.2 KiB
C++
135 lines
3.2 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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extern "C" {
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#include <osmocom/core/linuxlist.h>
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}
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#include <stdint.h>
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#include <string.h>
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#include <sys/time.h>
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#define LLC_MAX_LEN 1543
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struct 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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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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void consume(size_t len);
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void consume(uint8_t *data, size_t len);
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uint16_t chunk_size() const;
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uint16_t remaining_space() const;
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uint16_t frame_length() const;
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bool fits_in_current_frame(uint8_t size) const;
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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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/**
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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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struct MetaInfo {
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struct timeval recv_time;
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struct timeval expire_time;
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};
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static void calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec,
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struct timeval *tv);
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static bool is_frame_expired(const struct timeval *now,
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const struct timeval *tv);
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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 enqueue(struct msgb *llc_msg, const MetaInfo *info = 0);
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struct msgb *dequeue(const MetaInfo **info = 0);
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void clear(BTS *bts);
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void move_and_merge(gprs_llc_queue *o);
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size_t size() const;
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size_t octets() const;
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private:
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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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inline uint16_t gprs_llc::chunk_size() const
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{
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return m_length - m_index;
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}
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inline uint16_t gprs_llc::remaining_space() const
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{
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return LLC_MAX_LEN - m_length;
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}
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inline uint16_t gprs_llc::frame_length() const
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{
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return m_length;
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}
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inline void gprs_llc::consume(size_t len)
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{
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m_index += len;
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}
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inline void gprs_llc::consume(uint8_t *data, size_t len)
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{
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/* copy and increment index */
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memcpy(data, frame + m_index, len);
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consume(len);
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}
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inline bool gprs_llc::fits_in_current_frame(uint8_t chunk_size) const
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{
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return m_length + chunk_size <= LLC_MAX_LEN;
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}
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inline size_t gprs_llc_queue::size() const
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{
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return m_queue_size;
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}
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inline size_t gprs_llc_queue::octets() const
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{
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return m_queue_octets;
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}
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