Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +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 | #include "tbf.h" |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 20 | #include "bts.h" |
| 21 | #include "gprs_debug.h" |
Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +0100 | [diff] [blame] | 22 | |
| 23 | extern "C" { |
| 24 | #include <osmocom/core/utils.h> |
| 25 | } |
| 26 | |
| 27 | |
| 28 | uint8_t *gprs_rlc_data::prepare(size_t block_data_len) |
| 29 | { |
| 30 | /* todo.. only set it once if it turns out to be a bottleneck */ |
| 31 | memset(block, 0x0, ARRAY_SIZE(block)); |
| 32 | memset(block, 0x2b, block_data_len); |
| 33 | |
| 34 | return block; |
| 35 | } |
Holger Hans Peter Freyther | 321f3c3 | 2013-11-23 16:06:54 +0100 | [diff] [blame] | 36 | |
Holger Hans Peter Freyther | 423dd22 | 2013-11-25 23:24:29 +0100 | [diff] [blame] | 37 | void gprs_rlc_data::put_data(const uint8_t *data, size_t data_len) |
| 38 | { |
| 39 | memcpy(block, data, data_len); |
| 40 | len = data_len; |
| 41 | } |
| 42 | |
Holger Hans Peter Freyther | 321f3c3 | 2013-11-23 16:06:54 +0100 | [diff] [blame] | 43 | void gprs_rlc_v_b::reset() |
| 44 | { |
| 45 | for (size_t i = 0; i < ARRAY_SIZE(m_v_b); ++i) |
| 46 | mark_invalid(i); |
| 47 | } |
Holger Hans Peter Freyther | 1577779 | 2013-11-24 00:18:47 +0100 | [diff] [blame] | 48 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 49 | int gprs_rlc_v_b::resend_needed(const gprs_rlc_dl_window &w) |
Holger Hans Peter Freyther | 1577779 | 2013-11-24 00:18:47 +0100 | [diff] [blame] | 50 | { |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 51 | for (uint16_t bsn = w.v_a(); bsn != w.v_s(); bsn = (bsn + 1) & w.mod_sns()) { |
| 52 | uint16_t index = bsn & w.mod_sns_half(); |
Holger Hans Peter Freyther | 1577779 | 2013-11-24 00:18:47 +0100 | [diff] [blame] | 53 | if (is_nacked(index) || is_resend(index)) |
| 54 | return bsn; |
| 55 | } |
| 56 | |
| 57 | return -1; |
| 58 | } |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 59 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 60 | int gprs_rlc_v_b::mark_for_resend(const gprs_rlc_dl_window &w) |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 61 | { |
| 62 | int resend = 0; |
| 63 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 64 | for (uint16_t bsn = w.v_a(); bsn != w.v_s(); bsn = (bsn + 1) & w.mod_sns()) { |
| 65 | uint16_t index = bsn & w.mod_sns_half(); |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 66 | if (is_unacked(index)) { |
| 67 | /* mark to be re-send */ |
| 68 | mark_resend(index); |
| 69 | resend += 1; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | return resend; |
| 74 | } |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 75 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 76 | int gprs_rlc_v_b::count_unacked(const gprs_rlc_dl_window &w) |
Holger Hans Peter Freyther | 9c5539d | 2013-11-24 17:34:17 +0100 | [diff] [blame] | 77 | { |
| 78 | uint16_t unacked = 0; |
| 79 | uint16_t bsn; |
| 80 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 81 | for (bsn = w.v_a(); bsn != w.v_s(); bsn = (bsn + 1) & w.mod_sns()) { |
| 82 | uint16_t index = bsn & w.mod_sns_half(); |
Holger Hans Peter Freyther | 9c5539d | 2013-11-24 17:34:17 +0100 | [diff] [blame] | 83 | if (!is_acked(index)) |
| 84 | unacked += 1; |
| 85 | } |
| 86 | |
| 87 | return unacked; |
| 88 | } |
| 89 | |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 90 | void gprs_rlc_v_b::update(BTS *bts, char *show_rbb, uint8_t ssn, |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 91 | const gprs_rlc_dl_window &w, |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 92 | uint16_t *lost, uint16_t *received) |
| 93 | { |
| 94 | uint16_t bsn; |
| 95 | int i; |
| 96 | |
| 97 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 98 | for (i = 63, bsn = (ssn - 1) & w.mod_sns(); |
| 99 | i >= 0 && bsn != ((w.v_a() - 1) & w.mod_sns()); |
| 100 | i--, bsn = (bsn - 1) & w.mod_sns()) { |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 101 | |
| 102 | if (show_rbb[i] == '1') { |
| 103 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got ack for BSN=%d\n", bsn); |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 104 | if (!is_acked(bsn & w.mod_sns_half())) |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 105 | *received += 1; |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 106 | mark_acked(bsn & w.mod_sns_half()); |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 107 | } else { |
| 108 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got NACK for BSN=%d\n", bsn); |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 109 | mark_nacked(bsn & w.mod_sns_half()); |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 110 | bts->rlc_nacked(); |
| 111 | *lost += 1; |
| 112 | } |
| 113 | } |
| 114 | } |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 115 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 116 | int gprs_rlc_v_b::move_window(const gprs_rlc_dl_window &w) |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 117 | { |
| 118 | int i; |
| 119 | uint16_t bsn; |
| 120 | int moved = 0; |
| 121 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 122 | for (i = 0, bsn = w.v_a(); bsn != w.v_s(); i++, bsn = (bsn + 1) & w.mod_sns()) { |
| 123 | uint16_t index = bsn & w.mod_sns_half(); |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 124 | if (is_acked(index)) { |
| 125 | mark_invalid(index); |
| 126 | moved += 1; |
| 127 | } else |
| 128 | break; |
| 129 | } |
| 130 | |
| 131 | return moved; |
| 132 | } |
Holger Hans Peter Freyther | bc15570 | 2013-11-24 17:20:35 +0100 | [diff] [blame] | 133 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 134 | void gprs_rlc_v_b::state(char *show_v_b, const gprs_rlc_dl_window &w) |
Holger Hans Peter Freyther | bc15570 | 2013-11-24 17:20:35 +0100 | [diff] [blame] | 135 | { |
| 136 | int i; |
| 137 | uint16_t bsn; |
| 138 | |
Holger Hans Peter Freyther | f1593b7 | 2013-11-24 20:36:36 +0100 | [diff] [blame] | 139 | for (i = 0, bsn = w.v_a(); bsn != w.v_s(); i++, bsn = (bsn + 1) & w.mod_sns()) { |
| 140 | uint16_t index = bsn & w.mod_sns_half(); |
Holger Hans Peter Freyther | bc15570 | 2013-11-24 17:20:35 +0100 | [diff] [blame] | 141 | show_v_b[i] = m_v_b[index]; |
| 142 | if (show_v_b[i] == 0) |
| 143 | show_v_b[i] = ' '; |
| 144 | } |
| 145 | show_v_b[i] = '\0'; |
| 146 | } |
Holger Hans Peter Freyther | e9b1ebb | 2013-11-24 22:00:43 +0100 | [diff] [blame] | 147 | |
| 148 | void gprs_rlc_v_n::reset() |
| 149 | { |
| 150 | memset(m_v_n, 0x0, sizeof(m_v_n)); |
| 151 | } |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame^] | 152 | |
| 153 | /* Raise V(R) to highest received sequence number not received. */ |
| 154 | void gprs_rlc_ul_window::raise(const uint16_t bsn, gprs_rlc_v_n *v_n) |
| 155 | { |
| 156 | uint16_t offset_v_r; |
| 157 | offset_v_r = (bsn + 1 - v_r()) & mod_sns(); |
| 158 | /* Positive offset, so raise. */ |
| 159 | if (offset_v_r < (sns() >> 1)) { |
| 160 | while (offset_v_r--) { |
| 161 | if (offset_v_r) /* all except the received block */ |
| 162 | v_n->mark_missing(v_r() & mod_sns_half()); |
| 163 | raise(1); |
| 164 | } |
| 165 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", v_r()); |
| 166 | } |
| 167 | } |