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