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 | |
Jacob Erlbeck | 1eae96c | 2015-06-15 11:19:13 +0200 | [diff] [blame] | 21 | extern "C" { |
| 22 | #include <osmocom/core/linuxlist.h> |
| 23 | } |
| 24 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 25 | #include <stdint.h> |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 26 | #include <string.h> |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 27 | #include <time.h> |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 28 | |
| 29 | #define LLC_MAX_LEN 1543 |
| 30 | |
Jacob Erlbeck | 1d0a52a | 2015-06-02 11:28:07 +0200 | [diff] [blame] | 31 | struct BTS; |
Jacob Erlbeck | 1d0a52a | 2015-06-02 11:28:07 +0200 | [diff] [blame] | 32 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 33 | /** |
| 34 | * I represent the LLC data to a MS |
| 35 | */ |
| 36 | struct gprs_llc { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 37 | 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] | 38 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 39 | void init(); |
| 40 | void reset(); |
| 41 | void reset_frame_space(); |
| 42 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 43 | void put_frame(const uint8_t *data, size_t len); |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 44 | void put_dummy_frame(size_t req_len); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 45 | void append_frame(const uint8_t *data, size_t len); |
| 46 | |
| 47 | void consume(size_t len); |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 48 | void consume(uint8_t *data, size_t len); |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 49 | |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 50 | uint16_t chunk_size() const; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 51 | uint16_t remaining_space() const; |
| 52 | uint16_t frame_length() const; |
| 53 | |
| 54 | bool fits_in_current_frame(uint8_t size) const; |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 55 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 56 | 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] | 57 | uint16_t m_index; /* current write/read position of frame */ |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 58 | uint16_t m_length; /* len of current DL LLC_frame, 0 == no frame */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 59 | }; |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 60 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 61 | /** |
| 62 | * I store the LLC frames that come from the SGSN. |
| 63 | */ |
| 64 | struct gprs_llc_queue { |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 65 | struct MetaInfo { |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 66 | struct timespec recv_time; |
| 67 | struct timespec expire_time; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 68 | }; |
| 69 | |
Jacob Erlbeck | 1e50a3d | 2015-06-16 10:18:42 +0200 | [diff] [blame] | 70 | static void calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 71 | struct timespec *tv); |
| 72 | static bool is_frame_expired(const struct timespec *now, |
| 73 | const struct timespec *tv); |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 74 | static bool is_user_data_frame(uint8_t *data, size_t len); |
| 75 | |
| 76 | void init(); |
| 77 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 78 | void enqueue(struct msgb *llc_msg, const struct timespec *expire_time); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 79 | struct msgb *dequeue(const MetaInfo **info = 0); |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 80 | void clear(BTS *bts); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 81 | void move_and_merge(gprs_llc_queue *o); |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 82 | size_t size() const; |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 83 | size_t octets() const; |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 84 | |
| 85 | private: |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 86 | 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] | 87 | size_t m_queue_size; |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 88 | size_t m_queue_octets; |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 89 | struct llist_head m_queue; /* queued LLC DL data */ |
| 90 | |
Holger Hans Peter Freyther | be57081 | 2013-11-07 08:01:49 +0100 | [diff] [blame] | 91 | }; |
| 92 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 93 | |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 94 | inline uint16_t gprs_llc::chunk_size() const |
| 95 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 96 | return m_length - m_index; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | inline uint16_t gprs_llc::remaining_space() const |
| 100 | { |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 101 | return LLC_MAX_LEN - m_length; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | inline uint16_t gprs_llc::frame_length() const |
| 105 | { |
| 106 | return m_length; |
| 107 | } |
| 108 | |
| 109 | inline void gprs_llc::consume(size_t len) |
| 110 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 111 | m_index += len; |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | inline void gprs_llc::consume(uint8_t *data, size_t len) |
| 115 | { |
| 116 | /* copy and increment index */ |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 117 | memcpy(data, frame + m_index, len); |
| 118 | consume(len); |
Holger Hans Peter Freyther | acb5427 | 2013-11-07 08:15:58 +0100 | [diff] [blame] | 119 | } |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 120 | |
| 121 | inline bool gprs_llc::fits_in_current_frame(uint8_t chunk_size) const |
| 122 | { |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 123 | return m_length + chunk_size <= LLC_MAX_LEN; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 124 | } |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 125 | |
| 126 | inline size_t gprs_llc_queue::size() const |
| 127 | { |
Alexander Couzens | e4727a3 | 2016-06-07 14:31:29 +0200 | [diff] [blame] | 128 | return m_queue_size; |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 129 | } |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 130 | |
| 131 | inline size_t gprs_llc_queue::octets() const |
| 132 | { |
Alexander Couzens | e4727a3 | 2016-06-07 14:31:29 +0200 | [diff] [blame] | 133 | return m_queue_octets; |
Jacob Erlbeck | 07eb655 | 2015-06-15 11:05:44 +0200 | [diff] [blame] | 134 | } |