Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #pragma once |
| 20 | |
| 21 | #include <stdint.h> |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 22 | #include <string.h> |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 23 | |
| 24 | #define LLC_MAX_LEN 1543 |
| 25 | |
| 26 | /** |
| 27 | * I represent the LLC data to a MS |
| 28 | */ |
| 29 | struct gprs_llc { |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 30 | static void calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, struct timeval *tv); |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 31 | static bool is_frame_expired(struct timeval *now, struct timeval *tv); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 32 | static bool is_user_data_frame(uint8_t *data, size_t len); |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 33 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 34 | void init(); |
| 35 | void reset(); |
| 36 | void reset_frame_space(); |
| 37 | |
| 38 | void enqueue(struct msgb *llc_msg); |
| 39 | struct msgb *dequeue(); |
| 40 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 41 | void put_frame(const uint8_t *data, size_t len); |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 42 | void put_dummy_frame(size_t req_len); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 43 | void append_frame(const uint8_t *data, size_t len); |
| 44 | |
| 45 | void consume(size_t len); |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 46 | void consume(uint8_t *data, size_t len); |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 47 | void clear(BTS *bts); |
| 48 | |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 49 | uint16_t chunk_size() const; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 50 | uint16_t remaining_space() const; |
| 51 | uint16_t frame_length() const; |
| 52 | |
| 53 | bool fits_in_current_frame(uint8_t size) const; |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 54 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 55 | uint8_t frame[LLC_MAX_LEN]; /* current DL or UL frame */ |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 56 | uint16_t m_index; /* current write/read position of frame */ |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 57 | uint16_t m_length; /* len of current DL LLC_frame, 0 == no frame */ |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 58 | struct llist_head queue; /* queued LLC DL data */ |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 59 | |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 60 | uint32_t m_avg_queue_delay; /* Average delay of data going through the queue */ |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 61 | size_t m_queue_size; |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 62 | }; |
| 63 | |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 64 | inline uint16_t gprs_llc::chunk_size() const |
| 65 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 66 | return m_length - m_index; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | inline uint16_t gprs_llc::remaining_space() const |
| 70 | { |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 71 | return LLC_MAX_LEN - m_length; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | inline uint16_t gprs_llc::frame_length() const |
| 75 | { |
| 76 | return m_length; |
| 77 | } |
| 78 | |
| 79 | inline void gprs_llc::consume(size_t len) |
| 80 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 81 | m_index += len; |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | inline void gprs_llc::consume(uint8_t *data, size_t len) |
| 85 | { |
| 86 | /* copy and increment index */ |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 87 | memcpy(data, frame + m_index, len); |
| 88 | consume(len); |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 89 | } |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 90 | |
| 91 | inline bool gprs_llc::fits_in_current_frame(uint8_t chunk_size) const |
| 92 | { |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 93 | return m_length + chunk_size <= LLC_MAX_LEN; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 94 | } |