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 | |
Jacob Erlbeck | 4abc686 | 2015-12-08 15:14:05 +0100 | [diff] [blame] | 23 | #include <errno.h> |
| 24 | |
Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +0100 | [diff] [blame] | 25 | extern "C" { |
| 26 | #include <osmocom/core/utils.h> |
| 27 | } |
| 28 | |
| 29 | |
| 30 | uint8_t *gprs_rlc_data::prepare(size_t block_data_len) |
| 31 | { |
| 32 | /* todo.. only set it once if it turns out to be a bottleneck */ |
Holger Hans Peter Freyther | 88553ab | 2013-11-26 21:01:04 +0100 | [diff] [blame] | 33 | memset(block, 0x0, sizeof(block)); |
Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +0100 | [diff] [blame] | 34 | memset(block, 0x2b, block_data_len); |
| 35 | |
Aravind Sirsikar | 7a05b03 | 2016-03-23 18:29:45 +0530 | [diff] [blame] | 36 | /* Initial value of puncturing scheme */ |
| 37 | next_ps = EGPRS_PS_1; |
| 38 | |
Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +0100 | [diff] [blame] | 39 | return block; |
| 40 | } |
Holger Hans Peter Freyther | 321f3c3 | 2013-11-23 16:06:54 +0100 | [diff] [blame] | 41 | |
Holger Hans Peter Freyther | 423dd22 | 2013-11-25 23:24:29 +0100 | [diff] [blame] | 42 | void gprs_rlc_data::put_data(const uint8_t *data, size_t data_len) |
| 43 | { |
| 44 | memcpy(block, data, data_len); |
| 45 | len = data_len; |
| 46 | } |
| 47 | |
Holger Hans Peter Freyther | 321f3c3 | 2013-11-23 16:06:54 +0100 | [diff] [blame] | 48 | void gprs_rlc_v_b::reset() |
| 49 | { |
| 50 | for (size_t i = 0; i < ARRAY_SIZE(m_v_b); ++i) |
| 51 | mark_invalid(i); |
| 52 | } |
Holger Hans Peter Freyther | 1577779 | 2013-11-24 00:18:47 +0100 | [diff] [blame] | 53 | |
Daniel Willmann | 7e994e3 | 2014-08-07 15:49:21 +0200 | [diff] [blame] | 54 | void gprs_rlc_dl_window::reset() |
| 55 | { |
| 56 | m_v_s = 0; |
| 57 | m_v_a = 0; |
| 58 | m_v_b.reset(); |
| 59 | } |
| 60 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 61 | int gprs_rlc_dl_window::resend_needed() |
Holger Hans Peter Freyther | 1577779 | 2013-11-24 00:18:47 +0100 | [diff] [blame] | 62 | { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 63 | for (uint16_t bsn = v_a(); bsn != v_s(); bsn = mod_sns(bsn + 1)) { |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 64 | if (m_v_b.is_nacked(bsn) || m_v_b.is_resend(bsn)) |
Holger Hans Peter Freyther | 1577779 | 2013-11-24 00:18:47 +0100 | [diff] [blame] | 65 | return bsn; |
| 66 | } |
| 67 | |
| 68 | return -1; |
| 69 | } |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 70 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 71 | int gprs_rlc_dl_window::mark_for_resend() |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 72 | { |
| 73 | int resend = 0; |
| 74 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 75 | for (uint16_t bsn = v_a(); bsn != v_s(); bsn = mod_sns(bsn + 1)) { |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 76 | if (m_v_b.is_unacked(bsn)) { |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 77 | /* mark to be re-send */ |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 78 | m_v_b.mark_resend(bsn); |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 79 | resend += 1; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | return resend; |
| 84 | } |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 85 | |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 86 | /* Update the receive block bitmap */ |
| 87 | uint16_t gprs_rlc_ul_window::update_egprs_rbb(uint8_t *rbb) |
| 88 | { |
| 89 | int i; |
| 90 | uint16_t bsn; |
| 91 | uint16_t bitmask = 0x80; |
| 92 | int8_t pos = 0; |
| 93 | int8_t bit_pos = 0; |
| 94 | for (i = 0, bsn = (v_q()+1); ((bsn < (v_r())) && (i < ws())); i++, |
| 95 | bsn = this->mod_sns(bsn + 1)) { |
| 96 | if (m_v_n.is_received(bsn)) { |
| 97 | rbb[pos] = rbb[pos] | bitmask; |
| 98 | } else { |
| 99 | rbb[pos] = rbb[pos] & (~bitmask); |
| 100 | } |
| 101 | bitmask = bitmask >> 1; |
| 102 | bit_pos++; |
| 103 | bit_pos = bit_pos % 8; |
| 104 | if (bit_pos == 0) { |
| 105 | pos++; |
| 106 | bitmask = 0x80; |
| 107 | } |
| 108 | } |
| 109 | return i; |
| 110 | } |
| 111 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 112 | int gprs_rlc_dl_window::count_unacked() |
Holger Hans Peter Freyther | 9c5539d | 2013-11-24 17:34:17 +0100 | [diff] [blame] | 113 | { |
| 114 | uint16_t unacked = 0; |
| 115 | uint16_t bsn; |
| 116 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 117 | for (bsn = v_a(); bsn != v_s(); bsn = mod_sns(bsn + 1)) { |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 118 | if (!m_v_b.is_acked(bsn)) |
Holger Hans Peter Freyther | 9c5539d | 2013-11-24 17:34:17 +0100 | [diff] [blame] | 119 | unacked += 1; |
| 120 | } |
| 121 | |
| 122 | return unacked; |
| 123 | } |
| 124 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 125 | static uint16_t bitnum_to_bsn(int bitnum, uint16_t ssn) |
Daniel Willmann | cc5a4cb | 2013-12-11 20:04:29 +0100 | [diff] [blame] | 126 | { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 127 | return (ssn - 1 - bitnum); |
Daniel Willmann | cc5a4cb | 2013-12-11 20:04:29 +0100 | [diff] [blame] | 128 | } |
| 129 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 130 | void gprs_rlc_dl_window::update(BTS *bts, const struct bitvec *rbb, |
| 131 | uint16_t first_bsn, uint16_t *lost, |
| 132 | uint16_t *received) |
| 133 | { |
aravind sirsikar | fb41afa | 2016-11-02 15:48:00 +0530 | [diff] [blame] | 134 | unsigned dist = distance(); |
| 135 | unsigned num_blocks = rbb->cur_bit > dist |
| 136 | ? dist : rbb->cur_bit; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 137 | unsigned bsn; |
| 138 | |
| 139 | /* first_bsn is in range V(A)..V(S) */ |
| 140 | |
| 141 | for (unsigned int bitpos = 0; bitpos < num_blocks; bitpos++) { |
| 142 | bool is_ack; |
| 143 | bsn = mod_sns(first_bsn + bitpos); |
| 144 | if (bsn == mod_sns(v_a() - 1)) |
| 145 | break; |
| 146 | |
| 147 | is_ack = bitvec_get_bit_pos(rbb, bitpos) == 1; |
| 148 | |
| 149 | if (is_ack) { |
| 150 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got ack for BSN=%d\n", bsn); |
| 151 | if (!m_v_b.is_acked(bsn)) |
| 152 | *received += 1; |
| 153 | m_v_b.mark_acked(bsn); |
| 154 | } else { |
| 155 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got NACK for BSN=%d\n", bsn); |
| 156 | m_v_b.mark_nacked(bsn); |
| 157 | bts->rlc_nacked(); |
| 158 | *lost += 1; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | |
Jacob Erlbeck | e1ca87f | 2015-12-23 16:40:56 +0100 | [diff] [blame] | 163 | void gprs_rlc_dl_window::update(BTS *bts, char *show_rbb, uint16_t ssn, |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 164 | uint16_t *lost, uint16_t *received) |
| 165 | { |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 166 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 167 | for (int bitpos = 0; bitpos < ws(); bitpos++) { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 168 | uint16_t bsn = mod_sns(bitnum_to_bsn(bitpos, ssn)); |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 169 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 170 | if (bsn == mod_sns(v_a() - 1)) |
Daniel Willmann | cc5a4cb | 2013-12-11 20:04:29 +0100 | [diff] [blame] | 171 | break; |
| 172 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 173 | if (show_rbb[ws() - 1 - bitpos] == 'R') { |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 174 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got ack for BSN=%d\n", bsn); |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 175 | if (!m_v_b.is_acked(bsn)) |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 176 | *received += 1; |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 177 | m_v_b.mark_acked(bsn); |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 178 | } else { |
| 179 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got NACK for BSN=%d\n", bsn); |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 180 | m_v_b.mark_nacked(bsn); |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 181 | bts->rlc_nacked(); |
| 182 | *lost += 1; |
| 183 | } |
| 184 | } |
| 185 | } |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 186 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 187 | int gprs_rlc_dl_window::move_window() |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 188 | { |
| 189 | int i; |
| 190 | uint16_t bsn; |
| 191 | int moved = 0; |
| 192 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 193 | for (i = 0, bsn = v_a(); bsn != v_s(); i++, bsn = mod_sns(bsn + 1)) { |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 194 | if (m_v_b.is_acked(bsn)) { |
| 195 | m_v_b.mark_invalid(bsn); |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 196 | moved += 1; |
| 197 | } else |
| 198 | break; |
| 199 | } |
| 200 | |
| 201 | return moved; |
| 202 | } |
Holger Hans Peter Freyther | bc15570 | 2013-11-24 17:20:35 +0100 | [diff] [blame] | 203 | |
Daniel Willmann | 3ce011f | 2014-01-15 12:45:56 +0100 | [diff] [blame] | 204 | void gprs_rlc_dl_window::show_state(char *show_v_b) |
Holger Hans Peter Freyther | bc15570 | 2013-11-24 17:20:35 +0100 | [diff] [blame] | 205 | { |
| 206 | int i; |
| 207 | uint16_t bsn; |
| 208 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 209 | for (i = 0, bsn = v_a(); bsn != v_s(); i++, bsn = mod_sns(bsn + 1)) { |
Holger Hans Peter Freyther | 3cbf9e0 | 2013-11-26 21:43:58 +0100 | [diff] [blame] | 210 | uint16_t index = bsn & mod_sns_half(); |
Daniel Willmann | d54d9f5 | 2013-12-28 21:16:13 +0100 | [diff] [blame] | 211 | switch(m_v_b.get_state(index)) { |
| 212 | case GPRS_RLC_DL_BSN_INVALID: |
| 213 | show_v_b[i] = 'I'; |
| 214 | break; |
| 215 | case GPRS_RLC_DL_BSN_ACKED: |
| 216 | show_v_b[i] = 'A'; |
| 217 | break; |
| 218 | case GPRS_RLC_DL_BSN_RESEND: |
| 219 | show_v_b[i] = 'X'; |
| 220 | break; |
| 221 | case GPRS_RLC_DL_BSN_NACKED: |
| 222 | show_v_b[i] = 'N'; |
| 223 | break; |
Daniel Willmann | 3ce011f | 2014-01-15 12:45:56 +0100 | [diff] [blame] | 224 | default: |
| 225 | show_v_b[i] = '?'; |
Daniel Willmann | d54d9f5 | 2013-12-28 21:16:13 +0100 | [diff] [blame] | 226 | } |
Holger Hans Peter Freyther | bc15570 | 2013-11-24 17:20:35 +0100 | [diff] [blame] | 227 | } |
| 228 | show_v_b[i] = '\0'; |
| 229 | } |
Holger Hans Peter Freyther | e9b1ebb | 2013-11-24 22:00:43 +0100 | [diff] [blame] | 230 | |
| 231 | void gprs_rlc_v_n::reset() |
| 232 | { |
Daniel Willmann | d54d9f5 | 2013-12-28 21:16:13 +0100 | [diff] [blame] | 233 | for (size_t i = 0; i < ARRAY_SIZE(m_v_n); ++i) |
| 234 | m_v_n[i] = GPRS_RLC_UL_BSN_INVALID; |
Holger Hans Peter Freyther | e9b1ebb | 2013-11-24 22:00:43 +0100 | [diff] [blame] | 235 | } |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 236 | |
Jacob Erlbeck | db88380 | 2016-01-19 14:07:33 +0100 | [diff] [blame] | 237 | void gprs_rlc_window::set_sns(uint16_t sns) |
Jacob Erlbeck | 8f8197f | 2015-12-28 13:51:44 +0100 | [diff] [blame] | 238 | { |
| 239 | OSMO_ASSERT(sns >= RLC_GPRS_SNS); |
| 240 | OSMO_ASSERT(sns <= RLC_MAX_SNS); |
| 241 | /* check for 2^n */ |
| 242 | OSMO_ASSERT((sns & (-sns)) == sns); |
| 243 | m_sns = sns; |
| 244 | } |
| 245 | |
Jacob Erlbeck | db88380 | 2016-01-19 14:07:33 +0100 | [diff] [blame] | 246 | void gprs_rlc_window::set_ws(uint16_t ws) |
Jacob Erlbeck | 8f8197f | 2015-12-28 13:51:44 +0100 | [diff] [blame] | 247 | { |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 248 | LOGP(DRLCMAC, LOGL_INFO, "ws(%d)\n", |
| 249 | ws); |
Jacob Erlbeck | 8f8197f | 2015-12-28 13:51:44 +0100 | [diff] [blame] | 250 | OSMO_ASSERT(ws >= RLC_GPRS_SNS/2); |
| 251 | OSMO_ASSERT(ws <= RLC_MAX_SNS/2); |
| 252 | m_ws = ws; |
| 253 | } |
| 254 | |
Daniel Willmann | 8a31f9e | 2013-11-27 17:08:35 +0100 | [diff] [blame] | 255 | /* Update the receive block bitmap */ |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 256 | void gprs_rlc_ul_window::update_rbb(char *rbb) |
Daniel Willmann | 8a31f9e | 2013-11-27 17:08:35 +0100 | [diff] [blame] | 257 | { |
| 258 | int i; |
| 259 | for (i=0; i < ws(); i++) { |
Aravind Sirsikar | 7c7a86c | 2016-08-30 13:08:28 +0530 | [diff] [blame] | 260 | if (m_v_n.is_received((ssn()-1-i) & mod_sns())) |
Daniel Willmann | 8a31f9e | 2013-11-27 17:08:35 +0100 | [diff] [blame] | 261 | rbb[ws()-1-i] = 'R'; |
| 262 | else |
| 263 | rbb[ws()-1-i] = 'I'; |
| 264 | } |
| 265 | } |
| 266 | |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 267 | /* Raise V(R) to highest received sequence number not received. */ |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 268 | void gprs_rlc_ul_window::raise_v_r(const uint16_t bsn) |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 269 | { |
| 270 | uint16_t offset_v_r; |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 271 | offset_v_r = mod_sns(bsn + 1 - v_r()); |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 272 | /* Positive offset, so raise. */ |
| 273 | if (offset_v_r < (sns() >> 1)) { |
| 274 | while (offset_v_r--) { |
| 275 | if (offset_v_r) /* all except the received block */ |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 276 | m_v_n.mark_missing(v_r()); |
Daniel Willmann | f4a1ec6 | 2013-12-28 13:57:31 +0100 | [diff] [blame] | 277 | raise_v_r_to(1); |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 278 | } |
| 279 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", v_r()); |
| 280 | } |
| 281 | } |
Holger Hans Peter Freyther | 7f3e662 | 2013-11-25 23:51:19 +0100 | [diff] [blame] | 282 | |
| 283 | /* |
| 284 | * Raise V(Q) if possible. This is looped until there is a gap |
| 285 | * (non received block) or the window is empty. |
| 286 | */ |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 287 | uint16_t gprs_rlc_ul_window::raise_v_q() |
Holger Hans Peter Freyther | 7f3e662 | 2013-11-25 23:51:19 +0100 | [diff] [blame] | 288 | { |
| 289 | uint16_t count = 0; |
| 290 | |
| 291 | while (v_q() != v_r()) { |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 292 | if (!m_v_n.is_received(v_q())) |
Holger Hans Peter Freyther | 7f3e662 | 2013-11-25 23:51:19 +0100 | [diff] [blame] | 293 | break; |
| 294 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 295 | "V(Q) to %d\n", v_q(), mod_sns(v_q() + 1)); |
Holger Hans Peter Freyther | 7f3e662 | 2013-11-25 23:51:19 +0100 | [diff] [blame] | 296 | raise_v_q(1); |
| 297 | count += 1; |
| 298 | } |
| 299 | |
| 300 | return count; |
| 301 | } |
Daniel Willmann | 5584479 | 2013-12-28 14:41:00 +0100 | [diff] [blame] | 302 | |
Jacob Erlbeck | d87e1d6 | 2015-12-14 11:43:04 +0100 | [diff] [blame] | 303 | void gprs_rlc_ul_window::receive_bsn(const uint16_t bsn) |
Daniel Willmann | 5584479 | 2013-12-28 14:41:00 +0100 | [diff] [blame] | 304 | { |
| 305 | m_v_n.mark_received(bsn); |
| 306 | raise_v_r(bsn); |
Jacob Erlbeck | 784a0bd | 2015-12-14 11:54:29 +0100 | [diff] [blame] | 307 | } |
Daniel Willmann | 5584479 | 2013-12-28 14:41:00 +0100 | [diff] [blame] | 308 | |
Jacob Erlbeck | 784a0bd | 2015-12-14 11:54:29 +0100 | [diff] [blame] | 309 | bool gprs_rlc_ul_window::invalidate_bsn(const uint16_t bsn) |
| 310 | { |
| 311 | bool was_valid = m_v_n.is_received(bsn); |
| 312 | m_v_n.mark_missing(bsn); |
| 313 | |
| 314 | return was_valid; |
Daniel Willmann | 5584479 | 2013-12-28 14:41:00 +0100 | [diff] [blame] | 315 | } |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 316 | |
| 317 | static void gprs_rlc_data_header_init(struct gprs_rlc_data_info *rlc, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 318 | GprsCodingScheme cs, bool with_padding, unsigned int header_bits, |
| 319 | const unsigned int spb) |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 320 | { |
| 321 | unsigned int i; |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 322 | unsigned int padding_bits = with_padding ? cs.optionalPaddingBits() : 0; |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 323 | |
| 324 | memset(rlc, 0, sizeof(*rlc)); |
| 325 | |
| 326 | rlc->cs = cs; |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 327 | rlc->with_padding = with_padding; |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 328 | rlc->num_data_blocks = cs.numDataBlocks(); |
| 329 | |
| 330 | OSMO_ASSERT(rlc->num_data_blocks <= ARRAY_SIZE(rlc->block_info)); |
| 331 | |
| 332 | for (i = 0; i < rlc->num_data_blocks; i++) { |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 333 | gprs_rlc_data_block_info_init(&rlc->block_info[i], cs, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 334 | with_padding, spb); |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 335 | |
| 336 | rlc->data_offs_bits[i] = |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 337 | header_bits + padding_bits + |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 338 | (i+1) * cs.numDataBlockHeaderBits() + |
| 339 | i * 8 * rlc->block_info[0].data_len; |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | void gprs_rlc_data_info_init_dl(struct gprs_rlc_data_info *rlc, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 344 | GprsCodingScheme cs, bool with_padding, const unsigned int spb) |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 345 | { |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 346 | return gprs_rlc_data_header_init(rlc, cs, with_padding, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 347 | cs.numDataHeaderBitsDL(), spb); |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | void gprs_rlc_data_info_init_ul(struct gprs_rlc_data_info *rlc, |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 351 | GprsCodingScheme cs, bool with_padding) |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 352 | { |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 353 | /* |
| 354 | * last parameter is sent as 0 since common function used |
| 355 | * for both DL and UL |
| 356 | */ |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 357 | return gprs_rlc_data_header_init(rlc, cs, with_padding, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 358 | cs.numDataHeaderBitsUL(), 0); |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 359 | } |
| 360 | |
| 361 | void gprs_rlc_data_block_info_init(struct gprs_rlc_data_block_info *rdbi, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 362 | GprsCodingScheme cs, bool with_padding, const unsigned int spb) |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 363 | { |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 364 | unsigned int data_len = cs.maxDataBlockBytes(); |
| 365 | if (with_padding) |
| 366 | data_len -= cs.optionalPaddingBits() / 8; |
| 367 | |
| 368 | rdbi->data_len = data_len; |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 369 | rdbi->bsn = 0; |
| 370 | rdbi->ti = 0; |
| 371 | rdbi->e = 1; |
| 372 | rdbi->cv = 15; |
| 373 | rdbi->pi = 0; |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 374 | rdbi->spb = spb; |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 375 | } |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 376 | |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 377 | unsigned int gprs_rlc_mcs_cps(GprsCodingScheme cs, |
| 378 | enum egprs_puncturing_values punct, |
| 379 | enum egprs_puncturing_values punct2, int with_padding) |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 380 | { |
Neels Hofmeyr | b609190 | 2017-02-08 16:49:20 +0100 | [diff] [blame] | 381 | /* validate that punct and punct2 are as expected */ |
| 382 | switch (GprsCodingScheme::Scheme(cs)) { |
| 383 | case GprsCodingScheme::MCS9: |
| 384 | case GprsCodingScheme::MCS8: |
| 385 | case GprsCodingScheme::MCS7: |
| 386 | if (punct2 == EGPRS_PS_INVALID) { |
| 387 | LOGP(DRLCMACDL, LOGL_ERROR, |
| 388 | "Invalid punct2 value for coding scheme %d: %d\n", |
| 389 | GprsCodingScheme::Scheme(cs), punct2); |
| 390 | return -1; |
| 391 | } |
| 392 | /* fall through */ |
| 393 | case GprsCodingScheme::MCS6: |
| 394 | case GprsCodingScheme::MCS5: |
| 395 | case GprsCodingScheme::MCS4: |
| 396 | case GprsCodingScheme::MCS3: |
| 397 | case GprsCodingScheme::MCS2: |
| 398 | case GprsCodingScheme::MCS1: |
| 399 | if (punct == EGPRS_PS_INVALID) { |
| 400 | LOGP(DRLCMACDL, LOGL_ERROR, |
| 401 | "Invalid punct value for coding scheme %d: %d\n", |
| 402 | GprsCodingScheme::Scheme(cs), punct); |
| 403 | return -1; |
| 404 | } |
| 405 | break; |
| 406 | default: |
| 407 | return -1; |
| 408 | } |
| 409 | |
| 410 | /* See 3GPP TS 44.060 10.4.8a.3.1, 10.4.8a.2.1, 10.4.8a.1.1 */ |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 411 | switch (GprsCodingScheme::Scheme(cs)) { |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 412 | case GprsCodingScheme::MCS1: return 0b1011 + |
| 413 | punct % EGPRS_MAX_PS_NUM_2; |
| 414 | case GprsCodingScheme::MCS2: return 0b1001 + |
| 415 | punct % EGPRS_MAX_PS_NUM_2; |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 416 | case GprsCodingScheme::MCS3: return (with_padding ? 0b0110 : 0b0011) + |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 417 | punct % EGPRS_MAX_PS_NUM_3; |
| 418 | case GprsCodingScheme::MCS4: return 0b0000 + |
| 419 | punct % EGPRS_MAX_PS_NUM_3; |
| 420 | case GprsCodingScheme::MCS5: return 0b100 + |
| 421 | punct % EGPRS_MAX_PS_NUM_2; |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 422 | case GprsCodingScheme::MCS6: return (with_padding ? 0b010 : 0b000) + |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 423 | punct % EGPRS_MAX_PS_NUM_2; |
| 424 | case GprsCodingScheme::MCS7: return 0b10100 + |
| 425 | 3 * (punct % EGPRS_MAX_PS_NUM_3) + |
| 426 | punct2 % EGPRS_MAX_PS_NUM_3; |
| 427 | case GprsCodingScheme::MCS8: return 0b01011 + |
| 428 | 3 * (punct % EGPRS_MAX_PS_NUM_3) + |
| 429 | punct2 % EGPRS_MAX_PS_NUM_3; |
| 430 | case GprsCodingScheme::MCS9: return 0b00000 + |
| 431 | 4 * (punct % EGPRS_MAX_PS_NUM_3) + |
| 432 | punct2 % EGPRS_MAX_PS_NUM_3; |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 433 | default: ; |
| 434 | } |
| 435 | |
| 436 | return -1; |
| 437 | } |
Jacob Erlbeck | fbd82e4 | 2016-02-03 18:31:19 +0100 | [diff] [blame] | 438 | |
| 439 | void gprs_rlc_mcs_cps_decode(unsigned int cps, |
| 440 | GprsCodingScheme cs, int *punct, int *punct2, int *with_padding) |
| 441 | { |
| 442 | *punct2 = -1; |
| 443 | *with_padding = 0; |
| 444 | |
| 445 | switch (GprsCodingScheme::Scheme(cs)) { |
| 446 | case GprsCodingScheme::MCS1: |
| 447 | cps -= 0b1011; *punct = cps % 2; break; |
| 448 | case GprsCodingScheme::MCS2: |
| 449 | cps -= 0b1001; *punct = cps % 2; break; |
| 450 | case GprsCodingScheme::MCS3: |
| 451 | cps -= 0b0011; *punct = cps % 3; *with_padding = cps >= 3; break; |
| 452 | case GprsCodingScheme::MCS4: |
| 453 | cps -= 0b0000; *punct = cps % 3; break; |
| 454 | case GprsCodingScheme::MCS5: |
| 455 | cps -= 0b100; *punct = cps % 2; break; |
| 456 | case GprsCodingScheme::MCS6: |
| 457 | cps -= 0b000; *punct = cps % 2; *with_padding = cps >= 2; break; |
| 458 | case GprsCodingScheme::MCS7: |
| 459 | cps -= 0b10100; *punct = cps / 3; *punct2 = cps % 3; break; |
| 460 | case GprsCodingScheme::MCS8: |
| 461 | cps -= 0b01011; *punct = cps / 3; *punct2 = cps % 3; break; |
| 462 | case GprsCodingScheme::MCS9: |
| 463 | cps -= 0b00000; *punct = cps / 4; *punct2 = cps % 3; break; |
| 464 | default: ; |
| 465 | } |
| 466 | } |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 467 | |
| 468 | /* |
| 469 | * Finds the PS value for retransmission with MCS change, |
| 470 | * retransmission with no MCS change, fresh transmission cases. |
| 471 | * The return value shall be used for current transmission only |
| 472 | * 44.060 9.3.2.1 defines the PS selection for MCS change case |
| 473 | * cs_current is the output of MCS selection algorithm for retx |
| 474 | * cs is coding scheme of previous transmission of RLC data block |
| 475 | */ |
| 476 | enum egprs_puncturing_values gprs_get_punct_scheme( |
| 477 | enum egprs_puncturing_values punct, |
| 478 | const GprsCodingScheme &cs, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 479 | const GprsCodingScheme &cs_current, |
| 480 | const enum egprs_rlcmac_dl_spb spb) |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 481 | { |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 482 | |
| 483 | /* |
| 484 | * 10.4.8b of TS 44.060 |
| 485 | * If it is second segment of the block |
| 486 | * dont change the puncturing scheme |
| 487 | */ |
| 488 | if (spb == EGPRS_RLCMAC_DL_SEC_SEG) |
| 489 | return punct; |
| 490 | |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 491 | /* TS 44.060 9.3.2.1.1 */ |
| 492 | if ((GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS9) && |
| 493 | (GprsCodingScheme::Scheme(cs_current) == GprsCodingScheme::MCS6)) { |
| 494 | if ((punct == EGPRS_PS_1) || (punct == EGPRS_PS_3)) |
| 495 | return EGPRS_PS_1; |
| 496 | else if (punct == EGPRS_PS_2) |
| 497 | return EGPRS_PS_2; |
| 498 | } else if ((GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS6) && |
| 499 | (GprsCodingScheme::Scheme(cs_current) == GprsCodingScheme::MCS9)) { |
| 500 | if (punct == EGPRS_PS_1) |
| 501 | return EGPRS_PS_3; |
| 502 | else if (punct == EGPRS_PS_2) |
| 503 | return EGPRS_PS_2; |
| 504 | } else if ((GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS7) && |
| 505 | (GprsCodingScheme::Scheme(cs_current) == GprsCodingScheme::MCS5)) |
| 506 | return EGPRS_PS_1; |
| 507 | else if ((GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS5) && |
| 508 | (GprsCodingScheme::Scheme(cs_current) == GprsCodingScheme::MCS7)) |
| 509 | return EGPRS_PS_2; |
| 510 | else if (cs != cs_current) |
| 511 | return EGPRS_PS_1; |
| 512 | /* TS 44.060 9.3.2.1.1 ends here */ |
| 513 | /* |
| 514 | * Below else will handle fresh transmission, retransmission with no |
| 515 | * MCS change case |
| 516 | */ |
| 517 | else |
| 518 | return punct; |
| 519 | return EGPRS_PS_INVALID; |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * This function calculates puncturing scheme for retransmission of a RLC |
| 524 | * block with same MCS. The computed value shall be used for next transmission |
| 525 | * of the same RLC block |
| 526 | * TS 44.060 10.4.8a.3.1, 10.4.8a.2.1, 10.4.8a.1.1 |
| 527 | */ |
| 528 | void gprs_update_punct_scheme(enum egprs_puncturing_values *punct, |
| 529 | const GprsCodingScheme &cs) |
| 530 | { |
| 531 | switch (GprsCodingScheme::Scheme(cs)) { |
| 532 | case GprsCodingScheme::MCS1 : |
| 533 | case GprsCodingScheme::MCS2 : |
| 534 | case GprsCodingScheme::MCS5 : |
| 535 | case GprsCodingScheme::MCS6 : |
| 536 | *punct = ((enum egprs_puncturing_values)((*punct + 1) % |
| 537 | EGPRS_MAX_PS_NUM_2)); |
| 538 | break; |
| 539 | case GprsCodingScheme::MCS3 : |
| 540 | case GprsCodingScheme::MCS4 : |
| 541 | case GprsCodingScheme::MCS7 : |
| 542 | case GprsCodingScheme::MCS8 : |
| 543 | case GprsCodingScheme::MCS9 : |
| 544 | *punct = ((enum egprs_puncturing_values)((*punct + 1) % |
| 545 | EGPRS_MAX_PS_NUM_3)); |
| 546 | break; |
| 547 | default: |
| 548 | break; |
| 549 | } |
| 550 | } |