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 | |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 19 | #include "bts.h" |
| 20 | #include "gprs_debug.h" |
Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +0100 | [diff] [blame] | 21 | |
Jacob Erlbeck | 4abc686 | 2015-12-08 15:14:05 +0100 | [diff] [blame] | 22 | #include <errno.h> |
| 23 | |
Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +0100 | [diff] [blame] | 24 | extern "C" { |
| 25 | #include <osmocom/core/utils.h> |
| 26 | } |
| 27 | |
| 28 | |
| 29 | uint8_t *gprs_rlc_data::prepare(size_t block_data_len) |
| 30 | { |
| 31 | /* 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] | 32 | memset(block, 0x0, sizeof(block)); |
Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +0100 | [diff] [blame] | 33 | memset(block, 0x2b, block_data_len); |
| 34 | |
Aravind Sirsikar | 7a05b03 | 2016-03-23 18:29:45 +0530 | [diff] [blame] | 35 | /* Initial value of puncturing scheme */ |
| 36 | next_ps = EGPRS_PS_1; |
| 37 | |
Holger Hans Peter Freyther | 58db60c | 2013-11-13 20:45:40 +0100 | [diff] [blame] | 38 | return block; |
| 39 | } |
Holger Hans Peter Freyther | 321f3c3 | 2013-11-23 16:06:54 +0100 | [diff] [blame] | 40 | |
Holger Hans Peter Freyther | 423dd22 | 2013-11-25 23:24:29 +0100 | [diff] [blame] | 41 | void gprs_rlc_data::put_data(const uint8_t *data, size_t data_len) |
| 42 | { |
| 43 | memcpy(block, data, data_len); |
| 44 | len = data_len; |
| 45 | } |
| 46 | |
Holger Hans Peter Freyther | 321f3c3 | 2013-11-23 16:06:54 +0100 | [diff] [blame] | 47 | void gprs_rlc_v_b::reset() |
| 48 | { |
| 49 | for (size_t i = 0; i < ARRAY_SIZE(m_v_b); ++i) |
| 50 | mark_invalid(i); |
| 51 | } |
Holger Hans Peter Freyther | 1577779 | 2013-11-24 00:18:47 +0100 | [diff] [blame] | 52 | |
Daniel Willmann | 7e994e3 | 2014-08-07 15:49:21 +0200 | [diff] [blame] | 53 | void gprs_rlc_dl_window::reset() |
| 54 | { |
| 55 | m_v_s = 0; |
| 56 | m_v_a = 0; |
| 57 | m_v_b.reset(); |
| 58 | } |
| 59 | |
Max | ead08aa | 2017-12-13 18:25:36 +0100 | [diff] [blame] | 60 | int gprs_rlc_dl_window::resend_needed() const |
Holger Hans Peter Freyther | 1577779 | 2013-11-24 00:18:47 +0100 | [diff] [blame] | 61 | { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 62 | 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] | 63 | 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] | 64 | return bsn; |
| 65 | } |
| 66 | |
| 67 | return -1; |
| 68 | } |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 69 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 70 | int gprs_rlc_dl_window::mark_for_resend() |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 71 | { |
| 72 | int resend = 0; |
| 73 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 74 | 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] | 75 | if (m_v_b.is_unacked(bsn)) { |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 76 | /* mark to be re-send */ |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 77 | m_v_b.mark_resend(bsn); |
Holger Hans Peter Freyther | 8b16ae3 | 2013-11-24 00:38:54 +0100 | [diff] [blame] | 78 | resend += 1; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | return resend; |
| 83 | } |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 84 | |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 85 | /* Update the receive block bitmap */ |
| 86 | uint16_t gprs_rlc_ul_window::update_egprs_rbb(uint8_t *rbb) |
| 87 | { |
| 88 | int i; |
| 89 | uint16_t bsn; |
| 90 | uint16_t bitmask = 0x80; |
| 91 | int8_t pos = 0; |
| 92 | int8_t bit_pos = 0; |
| 93 | for (i = 0, bsn = (v_q()+1); ((bsn < (v_r())) && (i < ws())); i++, |
| 94 | bsn = this->mod_sns(bsn + 1)) { |
| 95 | if (m_v_n.is_received(bsn)) { |
| 96 | rbb[pos] = rbb[pos] | bitmask; |
| 97 | } else { |
| 98 | rbb[pos] = rbb[pos] & (~bitmask); |
| 99 | } |
| 100 | bitmask = bitmask >> 1; |
| 101 | bit_pos++; |
| 102 | bit_pos = bit_pos % 8; |
| 103 | if (bit_pos == 0) { |
| 104 | pos++; |
| 105 | bitmask = 0x80; |
| 106 | } |
| 107 | } |
| 108 | return i; |
| 109 | } |
| 110 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 111 | int gprs_rlc_dl_window::count_unacked() |
Holger Hans Peter Freyther | 9c5539d | 2013-11-24 17:34:17 +0100 | [diff] [blame] | 112 | { |
| 113 | uint16_t unacked = 0; |
| 114 | uint16_t bsn; |
| 115 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 116 | for (bsn = v_a(); bsn != v_s(); bsn = mod_sns(bsn + 1)) { |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 117 | if (!m_v_b.is_acked(bsn)) |
Holger Hans Peter Freyther | 9c5539d | 2013-11-24 17:34:17 +0100 | [diff] [blame] | 118 | unacked += 1; |
| 119 | } |
| 120 | |
| 121 | return unacked; |
| 122 | } |
| 123 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 124 | static uint16_t bitnum_to_bsn(int bitnum, uint16_t ssn) |
Daniel Willmann | cc5a4cb | 2013-12-11 20:04:29 +0100 | [diff] [blame] | 125 | { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 126 | return (ssn - 1 - bitnum); |
Daniel Willmann | cc5a4cb | 2013-12-11 20:04:29 +0100 | [diff] [blame] | 127 | } |
| 128 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 129 | void gprs_rlc_dl_window::update(BTS *bts, const struct bitvec *rbb, |
| 130 | uint16_t first_bsn, uint16_t *lost, |
| 131 | uint16_t *received) |
| 132 | { |
aravind sirsikar | fb41afa | 2016-11-02 15:48:00 +0530 | [diff] [blame] | 133 | unsigned dist = distance(); |
| 134 | unsigned num_blocks = rbb->cur_bit > dist |
| 135 | ? dist : rbb->cur_bit; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 136 | unsigned bsn; |
| 137 | |
| 138 | /* first_bsn is in range V(A)..V(S) */ |
| 139 | |
| 140 | for (unsigned int bitpos = 0; bitpos < num_blocks; bitpos++) { |
| 141 | bool is_ack; |
| 142 | bsn = mod_sns(first_bsn + bitpos); |
| 143 | if (bsn == mod_sns(v_a() - 1)) |
| 144 | break; |
| 145 | |
| 146 | is_ack = bitvec_get_bit_pos(rbb, bitpos) == 1; |
| 147 | |
| 148 | if (is_ack) { |
| 149 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got ack for BSN=%d\n", bsn); |
| 150 | if (!m_v_b.is_acked(bsn)) |
| 151 | *received += 1; |
| 152 | m_v_b.mark_acked(bsn); |
| 153 | } else { |
| 154 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got NACK for BSN=%d\n", bsn); |
| 155 | m_v_b.mark_nacked(bsn); |
| 156 | bts->rlc_nacked(); |
| 157 | *lost += 1; |
| 158 | } |
| 159 | } |
| 160 | } |
| 161 | |
Jacob Erlbeck | e1ca87f | 2015-12-23 16:40:56 +0100 | [diff] [blame] | 162 | 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] | 163 | uint16_t *lost, uint16_t *received) |
| 164 | { |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 165 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 166 | for (int bitpos = 0; bitpos < ws(); bitpos++) { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 167 | uint16_t bsn = mod_sns(bitnum_to_bsn(bitpos, ssn)); |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 168 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 169 | if (bsn == mod_sns(v_a() - 1)) |
Daniel Willmann | cc5a4cb | 2013-12-11 20:04:29 +0100 | [diff] [blame] | 170 | break; |
| 171 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 172 | if (show_rbb[ws() - 1 - bitpos] == 'R') { |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 173 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got ack for BSN=%d\n", bsn); |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 174 | if (!m_v_b.is_acked(bsn)) |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 175 | *received += 1; |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 176 | m_v_b.mark_acked(bsn); |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 177 | } else { |
| 178 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got NACK for BSN=%d\n", bsn); |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 179 | m_v_b.mark_nacked(bsn); |
Holger Hans Peter Freyther | df6b4f5 | 2013-11-24 17:05:48 +0100 | [diff] [blame] | 180 | bts->rlc_nacked(); |
| 181 | *lost += 1; |
| 182 | } |
| 183 | } |
| 184 | } |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 185 | |
Daniel Willmann | 146514e | 2013-12-28 18:24:42 +0100 | [diff] [blame] | 186 | int gprs_rlc_dl_window::move_window() |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 187 | { |
| 188 | int i; |
| 189 | uint16_t bsn; |
| 190 | int moved = 0; |
| 191 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 192 | 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] | 193 | if (m_v_b.is_acked(bsn)) { |
| 194 | m_v_b.mark_invalid(bsn); |
Holger Hans Peter Freyther | e358ff8 | 2013-11-24 17:13:10 +0100 | [diff] [blame] | 195 | moved += 1; |
| 196 | } else |
| 197 | break; |
| 198 | } |
| 199 | |
| 200 | return moved; |
| 201 | } |
Holger Hans Peter Freyther | bc15570 | 2013-11-24 17:20:35 +0100 | [diff] [blame] | 202 | |
Daniel Willmann | 3ce011f | 2014-01-15 12:45:56 +0100 | [diff] [blame] | 203 | 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] | 204 | { |
| 205 | int i; |
| 206 | uint16_t bsn; |
| 207 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 208 | 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] | 209 | uint16_t index = bsn & mod_sns_half(); |
Daniel Willmann | d54d9f5 | 2013-12-28 21:16:13 +0100 | [diff] [blame] | 210 | switch(m_v_b.get_state(index)) { |
| 211 | case GPRS_RLC_DL_BSN_INVALID: |
| 212 | show_v_b[i] = 'I'; |
| 213 | break; |
| 214 | case GPRS_RLC_DL_BSN_ACKED: |
| 215 | show_v_b[i] = 'A'; |
| 216 | break; |
| 217 | case GPRS_RLC_DL_BSN_RESEND: |
| 218 | show_v_b[i] = 'X'; |
| 219 | break; |
| 220 | case GPRS_RLC_DL_BSN_NACKED: |
| 221 | show_v_b[i] = 'N'; |
| 222 | break; |
Daniel Willmann | 3ce011f | 2014-01-15 12:45:56 +0100 | [diff] [blame] | 223 | default: |
| 224 | show_v_b[i] = '?'; |
Daniel Willmann | d54d9f5 | 2013-12-28 21:16:13 +0100 | [diff] [blame] | 225 | } |
Holger Hans Peter Freyther | bc15570 | 2013-11-24 17:20:35 +0100 | [diff] [blame] | 226 | } |
| 227 | show_v_b[i] = '\0'; |
| 228 | } |
Holger Hans Peter Freyther | e9b1ebb | 2013-11-24 22:00:43 +0100 | [diff] [blame] | 229 | |
| 230 | void gprs_rlc_v_n::reset() |
| 231 | { |
Daniel Willmann | d54d9f5 | 2013-12-28 21:16:13 +0100 | [diff] [blame] | 232 | for (size_t i = 0; i < ARRAY_SIZE(m_v_n); ++i) |
| 233 | m_v_n[i] = GPRS_RLC_UL_BSN_INVALID; |
Holger Hans Peter Freyther | e9b1ebb | 2013-11-24 22:00:43 +0100 | [diff] [blame] | 234 | } |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 235 | |
Jacob Erlbeck | db88380 | 2016-01-19 14:07:33 +0100 | [diff] [blame] | 236 | void gprs_rlc_window::set_sns(uint16_t sns) |
Jacob Erlbeck | 8f8197f | 2015-12-28 13:51:44 +0100 | [diff] [blame] | 237 | { |
| 238 | OSMO_ASSERT(sns >= RLC_GPRS_SNS); |
| 239 | OSMO_ASSERT(sns <= RLC_MAX_SNS); |
| 240 | /* check for 2^n */ |
| 241 | OSMO_ASSERT((sns & (-sns)) == sns); |
| 242 | m_sns = sns; |
| 243 | } |
| 244 | |
Jacob Erlbeck | db88380 | 2016-01-19 14:07:33 +0100 | [diff] [blame] | 245 | void gprs_rlc_window::set_ws(uint16_t ws) |
Jacob Erlbeck | 8f8197f | 2015-12-28 13:51:44 +0100 | [diff] [blame] | 246 | { |
sivasankari | 8adfcd0 | 2017-01-16 15:41:21 +0530 | [diff] [blame] | 247 | LOGP(DRLCMAC, LOGL_INFO, "ws(%d)\n", |
| 248 | ws); |
Jacob Erlbeck | 8f8197f | 2015-12-28 13:51:44 +0100 | [diff] [blame] | 249 | OSMO_ASSERT(ws >= RLC_GPRS_SNS/2); |
| 250 | OSMO_ASSERT(ws <= RLC_MAX_SNS/2); |
| 251 | m_ws = ws; |
| 252 | } |
| 253 | |
Daniel Willmann | 8a31f9e | 2013-11-27 17:08:35 +0100 | [diff] [blame] | 254 | /* Update the receive block bitmap */ |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 255 | void gprs_rlc_ul_window::update_rbb(char *rbb) |
Daniel Willmann | 8a31f9e | 2013-11-27 17:08:35 +0100 | [diff] [blame] | 256 | { |
| 257 | int i; |
| 258 | for (i=0; i < ws(); i++) { |
Aravind Sirsikar | 7c7a86c | 2016-08-30 13:08:28 +0530 | [diff] [blame] | 259 | if (m_v_n.is_received((ssn()-1-i) & mod_sns())) |
Daniel Willmann | 8a31f9e | 2013-11-27 17:08:35 +0100 | [diff] [blame] | 260 | rbb[ws()-1-i] = 'R'; |
| 261 | else |
| 262 | rbb[ws()-1-i] = 'I'; |
| 263 | } |
| 264 | } |
| 265 | |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 266 | /* Raise V(R) to highest received sequence number not received. */ |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 267 | 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] | 268 | { |
| 269 | uint16_t offset_v_r; |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 270 | offset_v_r = mod_sns(bsn + 1 - v_r()); |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 271 | /* Positive offset, so raise. */ |
| 272 | if (offset_v_r < (sns() >> 1)) { |
| 273 | while (offset_v_r--) { |
| 274 | if (offset_v_r) /* all except the received block */ |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 275 | m_v_n.mark_missing(v_r()); |
Daniel Willmann | f4a1ec6 | 2013-12-28 13:57:31 +0100 | [diff] [blame] | 276 | raise_v_r_to(1); |
Holger Hans Peter Freyther | cbb00eb | 2013-11-25 23:26:06 +0100 | [diff] [blame] | 277 | } |
| 278 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", v_r()); |
| 279 | } |
| 280 | } |
Holger Hans Peter Freyther | 7f3e662 | 2013-11-25 23:51:19 +0100 | [diff] [blame] | 281 | |
| 282 | /* |
| 283 | * Raise V(Q) if possible. This is looped until there is a gap |
| 284 | * (non received block) or the window is empty. |
| 285 | */ |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 286 | uint16_t gprs_rlc_ul_window::raise_v_q() |
Holger Hans Peter Freyther | 7f3e662 | 2013-11-25 23:51:19 +0100 | [diff] [blame] | 287 | { |
| 288 | uint16_t count = 0; |
| 289 | |
| 290 | while (v_q() != v_r()) { |
Daniel Willmann | 7c3751b | 2013-12-28 13:59:24 +0100 | [diff] [blame] | 291 | if (!m_v_n.is_received(v_q())) |
Holger Hans Peter Freyther | 7f3e662 | 2013-11-25 23:51:19 +0100 | [diff] [blame] | 292 | break; |
| 293 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 294 | "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] | 295 | raise_v_q(1); |
| 296 | count += 1; |
| 297 | } |
| 298 | |
| 299 | return count; |
| 300 | } |
Daniel Willmann | 5584479 | 2013-12-28 14:41:00 +0100 | [diff] [blame] | 301 | |
Jacob Erlbeck | d87e1d6 | 2015-12-14 11:43:04 +0100 | [diff] [blame] | 302 | void gprs_rlc_ul_window::receive_bsn(const uint16_t bsn) |
Daniel Willmann | 5584479 | 2013-12-28 14:41:00 +0100 | [diff] [blame] | 303 | { |
| 304 | m_v_n.mark_received(bsn); |
| 305 | raise_v_r(bsn); |
Jacob Erlbeck | 784a0bd | 2015-12-14 11:54:29 +0100 | [diff] [blame] | 306 | } |
Daniel Willmann | 5584479 | 2013-12-28 14:41:00 +0100 | [diff] [blame] | 307 | |
Jacob Erlbeck | 784a0bd | 2015-12-14 11:54:29 +0100 | [diff] [blame] | 308 | bool gprs_rlc_ul_window::invalidate_bsn(const uint16_t bsn) |
| 309 | { |
| 310 | bool was_valid = m_v_n.is_received(bsn); |
| 311 | m_v_n.mark_missing(bsn); |
| 312 | |
| 313 | return was_valid; |
Daniel Willmann | 5584479 | 2013-12-28 14:41:00 +0100 | [diff] [blame] | 314 | } |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 315 | |
| 316 | 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] | 317 | GprsCodingScheme cs, bool with_padding, unsigned int header_bits, |
| 318 | const unsigned int spb) |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 319 | { |
| 320 | unsigned int i; |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 321 | unsigned int padding_bits = with_padding ? cs.optionalPaddingBits() : 0; |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 322 | |
| 323 | memset(rlc, 0, sizeof(*rlc)); |
| 324 | |
| 325 | rlc->cs = cs; |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 326 | rlc->with_padding = with_padding; |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 327 | rlc->num_data_blocks = cs.numDataBlocks(); |
| 328 | |
| 329 | OSMO_ASSERT(rlc->num_data_blocks <= ARRAY_SIZE(rlc->block_info)); |
| 330 | |
| 331 | for (i = 0; i < rlc->num_data_blocks; i++) { |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 332 | gprs_rlc_data_block_info_init(&rlc->block_info[i], cs, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 333 | with_padding, spb); |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 334 | |
| 335 | rlc->data_offs_bits[i] = |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 336 | header_bits + padding_bits + |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 337 | (i+1) * cs.numDataBlockHeaderBits() + |
| 338 | i * 8 * rlc->block_info[0].data_len; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | 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] | 343 | GprsCodingScheme cs, bool with_padding, const unsigned int spb) |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 344 | { |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 345 | return gprs_rlc_data_header_init(rlc, cs, with_padding, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 346 | cs.numDataHeaderBitsDL(), spb); |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | 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] | 350 | GprsCodingScheme cs, bool with_padding) |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 351 | { |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 352 | /* |
| 353 | * last parameter is sent as 0 since common function used |
| 354 | * for both DL and UL |
| 355 | */ |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 356 | return gprs_rlc_data_header_init(rlc, cs, with_padding, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 357 | cs.numDataHeaderBitsUL(), 0); |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | 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] | 361 | GprsCodingScheme cs, bool with_padding, const unsigned int spb) |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 362 | { |
Jacob Erlbeck | b55f313 | 2016-02-03 18:28:04 +0100 | [diff] [blame] | 363 | unsigned int data_len = cs.maxDataBlockBytes(); |
| 364 | if (with_padding) |
| 365 | data_len -= cs.optionalPaddingBits() / 8; |
| 366 | |
| 367 | rdbi->data_len = data_len; |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 368 | rdbi->bsn = 0; |
| 369 | rdbi->ti = 0; |
| 370 | rdbi->e = 1; |
| 371 | rdbi->cv = 15; |
| 372 | rdbi->pi = 0; |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 373 | rdbi->spb = spb; |
Jacob Erlbeck | 6e9f9c2 | 2016-01-11 11:15:45 +0100 | [diff] [blame] | 374 | } |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 375 | |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 376 | unsigned int gprs_rlc_mcs_cps(GprsCodingScheme cs, |
| 377 | enum egprs_puncturing_values punct, |
| 378 | enum egprs_puncturing_values punct2, int with_padding) |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 379 | { |
Neels Hofmeyr | b609190 | 2017-02-08 16:49:20 +0100 | [diff] [blame] | 380 | /* validate that punct and punct2 are as expected */ |
| 381 | switch (GprsCodingScheme::Scheme(cs)) { |
| 382 | case GprsCodingScheme::MCS9: |
| 383 | case GprsCodingScheme::MCS8: |
| 384 | case GprsCodingScheme::MCS7: |
| 385 | if (punct2 == EGPRS_PS_INVALID) { |
| 386 | LOGP(DRLCMACDL, LOGL_ERROR, |
| 387 | "Invalid punct2 value for coding scheme %d: %d\n", |
| 388 | GprsCodingScheme::Scheme(cs), punct2); |
| 389 | return -1; |
| 390 | } |
| 391 | /* fall through */ |
| 392 | case GprsCodingScheme::MCS6: |
| 393 | case GprsCodingScheme::MCS5: |
| 394 | case GprsCodingScheme::MCS4: |
| 395 | case GprsCodingScheme::MCS3: |
| 396 | case GprsCodingScheme::MCS2: |
| 397 | case GprsCodingScheme::MCS1: |
| 398 | if (punct == EGPRS_PS_INVALID) { |
| 399 | LOGP(DRLCMACDL, LOGL_ERROR, |
| 400 | "Invalid punct value for coding scheme %d: %d\n", |
| 401 | GprsCodingScheme::Scheme(cs), punct); |
| 402 | return -1; |
| 403 | } |
| 404 | break; |
| 405 | default: |
| 406 | return -1; |
| 407 | } |
| 408 | |
| 409 | /* 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] | 410 | switch (GprsCodingScheme::Scheme(cs)) { |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 411 | case GprsCodingScheme::MCS1: return 0b1011 + |
| 412 | punct % EGPRS_MAX_PS_NUM_2; |
| 413 | case GprsCodingScheme::MCS2: return 0b1001 + |
| 414 | punct % EGPRS_MAX_PS_NUM_2; |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 415 | case GprsCodingScheme::MCS3: return (with_padding ? 0b0110 : 0b0011) + |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 416 | punct % EGPRS_MAX_PS_NUM_3; |
| 417 | case GprsCodingScheme::MCS4: return 0b0000 + |
| 418 | punct % EGPRS_MAX_PS_NUM_3; |
| 419 | case GprsCodingScheme::MCS5: return 0b100 + |
| 420 | punct % EGPRS_MAX_PS_NUM_2; |
Jacob Erlbeck | 9e85939 | 2016-02-02 11:48:37 +0100 | [diff] [blame] | 421 | case GprsCodingScheme::MCS6: return (with_padding ? 0b010 : 0b000) + |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 422 | punct % EGPRS_MAX_PS_NUM_2; |
| 423 | case GprsCodingScheme::MCS7: return 0b10100 + |
| 424 | 3 * (punct % EGPRS_MAX_PS_NUM_3) + |
| 425 | punct2 % EGPRS_MAX_PS_NUM_3; |
| 426 | case GprsCodingScheme::MCS8: return 0b01011 + |
| 427 | 3 * (punct % EGPRS_MAX_PS_NUM_3) + |
| 428 | punct2 % EGPRS_MAX_PS_NUM_3; |
| 429 | case GprsCodingScheme::MCS9: return 0b00000 + |
| 430 | 4 * (punct % EGPRS_MAX_PS_NUM_3) + |
| 431 | punct2 % EGPRS_MAX_PS_NUM_3; |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 432 | default: ; |
| 433 | } |
| 434 | |
| 435 | return -1; |
| 436 | } |
Jacob Erlbeck | fbd82e4 | 2016-02-03 18:31:19 +0100 | [diff] [blame] | 437 | |
| 438 | void gprs_rlc_mcs_cps_decode(unsigned int cps, |
| 439 | GprsCodingScheme cs, int *punct, int *punct2, int *with_padding) |
| 440 | { |
| 441 | *punct2 = -1; |
| 442 | *with_padding = 0; |
| 443 | |
| 444 | switch (GprsCodingScheme::Scheme(cs)) { |
| 445 | case GprsCodingScheme::MCS1: |
| 446 | cps -= 0b1011; *punct = cps % 2; break; |
| 447 | case GprsCodingScheme::MCS2: |
| 448 | cps -= 0b1001; *punct = cps % 2; break; |
| 449 | case GprsCodingScheme::MCS3: |
| 450 | cps -= 0b0011; *punct = cps % 3; *with_padding = cps >= 3; break; |
| 451 | case GprsCodingScheme::MCS4: |
| 452 | cps -= 0b0000; *punct = cps % 3; break; |
| 453 | case GprsCodingScheme::MCS5: |
| 454 | cps -= 0b100; *punct = cps % 2; break; |
| 455 | case GprsCodingScheme::MCS6: |
| 456 | cps -= 0b000; *punct = cps % 2; *with_padding = cps >= 2; break; |
| 457 | case GprsCodingScheme::MCS7: |
| 458 | cps -= 0b10100; *punct = cps / 3; *punct2 = cps % 3; break; |
| 459 | case GprsCodingScheme::MCS8: |
| 460 | cps -= 0b01011; *punct = cps / 3; *punct2 = cps % 3; break; |
| 461 | case GprsCodingScheme::MCS9: |
| 462 | cps -= 0b00000; *punct = cps / 4; *punct2 = cps % 3; break; |
| 463 | default: ; |
| 464 | } |
| 465 | } |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 466 | |
| 467 | /* |
| 468 | * Finds the PS value for retransmission with MCS change, |
| 469 | * retransmission with no MCS change, fresh transmission cases. |
| 470 | * The return value shall be used for current transmission only |
| 471 | * 44.060 9.3.2.1 defines the PS selection for MCS change case |
| 472 | * cs_current is the output of MCS selection algorithm for retx |
| 473 | * cs is coding scheme of previous transmission of RLC data block |
| 474 | */ |
| 475 | enum egprs_puncturing_values gprs_get_punct_scheme( |
| 476 | enum egprs_puncturing_values punct, |
| 477 | const GprsCodingScheme &cs, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 478 | const GprsCodingScheme &cs_current, |
| 479 | const enum egprs_rlcmac_dl_spb spb) |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 480 | { |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 481 | |
| 482 | /* |
| 483 | * 10.4.8b of TS 44.060 |
| 484 | * If it is second segment of the block |
| 485 | * dont change the puncturing scheme |
| 486 | */ |
| 487 | if (spb == EGPRS_RLCMAC_DL_SEC_SEG) |
| 488 | return punct; |
| 489 | |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 490 | /* TS 44.060 9.3.2.1.1 */ |
| 491 | if ((GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS9) && |
| 492 | (GprsCodingScheme::Scheme(cs_current) == GprsCodingScheme::MCS6)) { |
| 493 | if ((punct == EGPRS_PS_1) || (punct == EGPRS_PS_3)) |
| 494 | return EGPRS_PS_1; |
| 495 | else if (punct == EGPRS_PS_2) |
| 496 | return EGPRS_PS_2; |
| 497 | } else if ((GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS6) && |
| 498 | (GprsCodingScheme::Scheme(cs_current) == GprsCodingScheme::MCS9)) { |
| 499 | if (punct == EGPRS_PS_1) |
| 500 | return EGPRS_PS_3; |
| 501 | else if (punct == EGPRS_PS_2) |
| 502 | return EGPRS_PS_2; |
| 503 | } else if ((GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS7) && |
| 504 | (GprsCodingScheme::Scheme(cs_current) == GprsCodingScheme::MCS5)) |
| 505 | return EGPRS_PS_1; |
| 506 | else if ((GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS5) && |
| 507 | (GprsCodingScheme::Scheme(cs_current) == GprsCodingScheme::MCS7)) |
| 508 | return EGPRS_PS_2; |
| 509 | else if (cs != cs_current) |
| 510 | return EGPRS_PS_1; |
| 511 | /* TS 44.060 9.3.2.1.1 ends here */ |
| 512 | /* |
| 513 | * Below else will handle fresh transmission, retransmission with no |
| 514 | * MCS change case |
| 515 | */ |
| 516 | else |
| 517 | return punct; |
| 518 | return EGPRS_PS_INVALID; |
| 519 | } |
| 520 | |
| 521 | /* |
| 522 | * This function calculates puncturing scheme for retransmission of a RLC |
| 523 | * block with same MCS. The computed value shall be used for next transmission |
| 524 | * of the same RLC block |
| 525 | * TS 44.060 10.4.8a.3.1, 10.4.8a.2.1, 10.4.8a.1.1 |
| 526 | */ |
| 527 | void gprs_update_punct_scheme(enum egprs_puncturing_values *punct, |
| 528 | const GprsCodingScheme &cs) |
| 529 | { |
| 530 | switch (GprsCodingScheme::Scheme(cs)) { |
| 531 | case GprsCodingScheme::MCS1 : |
| 532 | case GprsCodingScheme::MCS2 : |
| 533 | case GprsCodingScheme::MCS5 : |
| 534 | case GprsCodingScheme::MCS6 : |
| 535 | *punct = ((enum egprs_puncturing_values)((*punct + 1) % |
| 536 | EGPRS_MAX_PS_NUM_2)); |
| 537 | break; |
| 538 | case GprsCodingScheme::MCS3 : |
| 539 | case GprsCodingScheme::MCS4 : |
| 540 | case GprsCodingScheme::MCS7 : |
| 541 | case GprsCodingScheme::MCS8 : |
| 542 | case GprsCodingScheme::MCS9 : |
| 543 | *punct = ((enum egprs_puncturing_values)((*punct + 1) % |
| 544 | EGPRS_MAX_PS_NUM_3)); |
| 545 | break; |
| 546 | default: |
| 547 | break; |
| 548 | } |
| 549 | } |