Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 1 | /* Copied from tbf.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <tbf.h> |
| 23 | #include <bts.h> |
| 24 | |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 25 | #include <stdio.h> |
| 26 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 27 | extern "C" { |
| 28 | #include <osmocom/core/msgb.h> |
| 29 | } |
| 30 | |
| 31 | /* reset LLC frame */ |
| 32 | void gprs_llc::reset() |
| 33 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 34 | m_index = 0; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 35 | m_length = 0; |
Holger Hans Peter Freyther | a42b2ad | 2013-11-26 16:39:47 +0100 | [diff] [blame] | 36 | |
| 37 | memset(frame, 0x42, sizeof(frame)); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | void gprs_llc::reset_frame_space() |
| 41 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 42 | m_index = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | void gprs_llc::enqueue(struct msgb *llc_msg) |
| 46 | { |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 47 | m_queue_size += 1; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 48 | msgb_enqueue(&queue, llc_msg); |
| 49 | } |
| 50 | |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 51 | /* Put an Unconfirmed Information (UI) Dummy command, see GSM 44.064, 6.4.2.2 */ |
| 52 | void gprs_llc::put_dummy_frame(size_t req_len) |
| 53 | { |
| 54 | /* The shortest dummy command (the spec requests at least 6 octets) */ |
| 55 | static const uint8_t llc_dummy_command[] = { |
| 56 | 0x43, 0xc0, 0x01, 0x2b, 0x2b, 0x2b |
| 57 | }; |
| 58 | static const int max_dummy_command_len = 79; |
| 59 | |
| 60 | put_frame(llc_dummy_command, sizeof(llc_dummy_command)); |
| 61 | |
| 62 | if (req_len > max_dummy_command_len) |
| 63 | req_len = max_dummy_command_len; |
| 64 | |
| 65 | /* Add further stuffing, if the requested length exceeds the minimum |
| 66 | * dummy command length */ |
| 67 | while (m_length < req_len) |
| 68 | frame[m_length++] = 0x2b; |
| 69 | } |
| 70 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 71 | void gprs_llc::put_frame(const uint8_t *data, size_t len) |
| 72 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 73 | /* only put frames when we are empty */ |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 74 | OSMO_ASSERT(m_index == 0 && m_length == 0); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 75 | append_frame(data, len); |
| 76 | } |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 77 | |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 78 | void gprs_llc::append_frame(const uint8_t *data, size_t len) |
| 79 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 80 | /* TODO: bounds check */ |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 81 | memcpy(frame + m_length, data, len); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 82 | m_length += len; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | void gprs_llc::clear(BTS *bts) |
| 86 | { |
| 87 | struct msgb *msg; |
| 88 | |
| 89 | while ((msg = msgb_dequeue(&queue))) { |
Holger Hans Peter Freyther | b3d5ee2 | 2013-11-13 16:43:26 +0100 | [diff] [blame] | 90 | bts->llc_dropped_frame(); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 91 | msgb_free(msg); |
| 92 | } |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 93 | |
| 94 | m_queue_size = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | void gprs_llc::init() |
| 98 | { |
| 99 | INIT_LLIST_HEAD(&queue); |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 100 | m_queue_size = 0; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 101 | m_avg_queue_delay = 0; |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 102 | reset(); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 103 | } |
| 104 | |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 105 | #define ALPHA 0.5f |
| 106 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 107 | struct msgb *gprs_llc::dequeue() |
| 108 | { |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 109 | struct msgb *msg; |
| 110 | struct timeval *tv, tv_now, tv_result; |
| 111 | uint32_t lifetime; |
| 112 | |
| 113 | |
| 114 | msg = msgb_dequeue(&queue); |
| 115 | if (!msg) |
| 116 | return NULL; |
| 117 | |
| 118 | m_queue_size -= 1; |
| 119 | |
| 120 | /* take the second time */ |
| 121 | gettimeofday(&tv_now, NULL); |
| 122 | tv = (struct timeval *)&msg->data[sizeof(*tv)]; |
| 123 | timersub(&tv_now, tv, &tv_result); |
| 124 | |
| 125 | lifetime = tv_result.tv_sec*1000 + tv_result.tv_usec/1000; |
| 126 | m_avg_queue_delay = m_avg_queue_delay * ALPHA + lifetime * (1-ALPHA); |
| 127 | |
| 128 | return msg; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 129 | } |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 130 | |
| 131 | |
| 132 | void gprs_llc::calc_pdu_lifetime(BTS *bts, const uint16_t pdu_delay_csec, struct timeval *tv) |
| 133 | { |
| 134 | uint16_t delay_csec; |
| 135 | if (bts->bts_data()->force_llc_lifetime) |
| 136 | delay_csec = bts->bts_data()->force_llc_lifetime; |
| 137 | else |
| 138 | delay_csec = pdu_delay_csec; |
| 139 | |
Holger Hans Peter Freyther | 5a7f636 | 2013-11-21 21:59:32 +0100 | [diff] [blame] | 140 | /* keep timestamp at 0 for infinite delay */ |
Holger Hans Peter Freyther | 985fd11 | 2013-11-13 15:19:39 +0100 | [diff] [blame] | 141 | if (delay_csec == 0xffff) { |
| 142 | memset(tv, 0, sizeof(*tv)); |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | /* calculate timestamp of timeout */ |
Holger Hans Peter Freyther | 51e093b | 2013-11-13 15:35:45 +0100 | [diff] [blame] | 147 | struct timeval now, csec; |
| 148 | gettimeofday(&now, NULL); |
| 149 | csec.tv_usec = (delay_csec % 100) * 10000; |
| 150 | csec.tv_sec = delay_csec / 100; |
| 151 | |
| 152 | timeradd(&now, &csec, tv); |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 153 | } |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 154 | |
| 155 | bool gprs_llc::is_frame_expired(struct timeval *tv_now, struct timeval *tv) |
| 156 | { |
| 157 | /* Timeout is infinite */ |
| 158 | if (tv->tv_sec == 0 && tv->tv_usec == 0) |
| 159 | return false; |
| 160 | |
| 161 | return timercmp(tv_now, tv, >); |
| 162 | } |