Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 1 | /* PDCH scheduler |
| 2 | * |
| 3 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version 2 |
| 8 | * of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <gprs_bssgp_pcu.h> |
| 21 | #include <gprs_rlcmac.h> |
| 22 | #include <pcu_l1_if.h> |
| 23 | |
| 24 | extern struct llist_head block_queue; |
| 25 | |
| 26 | static uint8_t rlcmac_dl_idle[23] = { |
| 27 | 0x47, /* control without optional header octets, no polling, USF=111 */ |
| 28 | 0x94, /* dummy downlink control message, paging mode 00 */ |
| 29 | 0x2b, /* no persistance level, 7 bits spare pattern */ |
| 30 | 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, |
| 31 | 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b |
| 32 | }; |
| 33 | |
| 34 | int gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn, |
| 35 | uint32_t fn, uint8_t block_nr) |
| 36 | { |
| 37 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 38 | struct gprs_rlcmac_pdch *pdch; |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 39 | struct gprs_rlcmac_tbf *tbf, *poll_tbf = NULL, *dl_ass_tbf = NULL, |
| 40 | *ul_ass_tbf = NULL, *ul_ack_tbf = NULL; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 41 | uint8_t usf = 0x7; |
| 42 | struct msgb *msg = NULL; |
| 43 | uint32_t poll_fn; |
| 44 | uint8_t i, tfi; |
| 45 | |
| 46 | if (trx >= 8 || ts >= 8) |
| 47 | return -EINVAL; |
| 48 | pdch = &bts->trx[trx].pdch[ts]; |
| 49 | |
| 50 | if (!pdch->enable) { |
| 51 | LOGP(DRLCMACSCHED, LOGL_ERROR, "Received RTS on disabled PDCH: " |
| 52 | "TRX=%d TS=%d\n", trx, ts); |
| 53 | return -EIO; |
| 54 | } |
| 55 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 56 | /* store last frame number of RTS */ |
| 57 | pdch->last_rts_fn = fn; |
| 58 | |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 59 | /* check special TBF for events */ |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 60 | poll_fn = fn + 4; |
| 61 | if ((block_nr % 3) == 2) |
| 62 | poll_fn ++; |
| 63 | poll_fn = poll_fn % 2715648; |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 64 | llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) { |
| 65 | /* this trx, this ts */ |
| 66 | if (tbf->trx != trx || tbf->control_ts != ts) |
| 67 | continue; |
| 68 | /* polling for next uplink block */ |
| 69 | if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED |
| 70 | && tbf->poll_fn == poll_fn) |
| 71 | poll_tbf = tbf; |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 72 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_SEND_ACK) |
| 73 | ul_ack_tbf = tbf; |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 74 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS) |
| 75 | dl_ass_tbf = tbf; |
| 76 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS) |
| 77 | ul_ass_tbf = tbf; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 78 | } |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 79 | llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) { |
| 80 | /* this trx, this ts */ |
| 81 | if (tbf->trx != trx || tbf->control_ts != ts) |
| 82 | continue; |
| 83 | /* polling for next uplink block */ |
| 84 | if (tbf->poll_state == GPRS_RLCMAC_POLL_SCHED |
| 85 | && tbf->poll_fn == poll_fn) |
| 86 | poll_tbf = tbf; |
| 87 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_SEND_ASS) |
| 88 | dl_ass_tbf = tbf; |
| 89 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_SEND_ASS) |
| 90 | ul_ass_tbf = tbf; |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | /* check uplink ressource for polling */ |
| 94 | if (poll_tbf) { |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 95 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d " |
| 96 | "TS=%d FN=%d block_nr=%d scheduling free USF for " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 97 | "polling at FN=%d of %s TFI=%d\n", trx, ts, fn, |
| 98 | block_nr, poll_fn, |
| 99 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 100 | poll_tbf->tfi); |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 101 | /* use free USF */ |
| 102 | /* else, we search for uplink ressource */ |
| 103 | } else { |
| 104 | /* select uplink ressource */ |
| 105 | for (i = 0, tfi = pdch->next_ul_tfi; i < 32; |
| 106 | i++, tfi = (tfi + 1) & 31) { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 107 | tbf = pdch->ul_tbf[tfi]; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 108 | /* no TBF for this tfi, go next */ |
| 109 | if (!tbf) |
| 110 | continue; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 111 | /* no UL ressources needed, go next */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 112 | /* we don't need to give ressources in FINISHED state, |
| 113 | * because we have received all blocks and only poll |
| 114 | * for packet control ack. */ |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 115 | if (tbf->state != GPRS_RLCMAC_FLOW) |
| 116 | continue; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 117 | |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 118 | /* use this USF */ |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 119 | usf = tbf->dir.ul.usf[ts]; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 120 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: " |
| 121 | "TRX=%d TS=%d FN=%d block_nr=%d scheduling " |
| 122 | "USF=%d for required uplink ressource of " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 123 | "UL TBF=%d\n", trx, ts, fn, block_nr, usf, tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 124 | /* next TBF to handle ressource is the next one */ |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 125 | pdch->next_ul_tfi = (tfi + 1) & 31; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 126 | break; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 127 | } |
| 128 | } |
| 129 | |
| 130 | /* Prio 1: select control message */ |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 131 | /* schedule PACKET DOWNLINK ASSIGNMENT */ |
| 132 | if (dl_ass_tbf) { |
| 133 | tbf = dl_ass_tbf; |
| 134 | msg = gprs_rlcmac_send_packet_downlink_assignment(tbf, fn); |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 135 | } |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 136 | /* schedule PACKET UPLINK ASSIGNMENT */ |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 137 | if (!msg && ul_ass_tbf) { |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 138 | tbf = ul_ass_tbf; |
| 139 | msg = gprs_rlcmac_send_packet_uplink_assignment(tbf, fn); |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 140 | } |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 141 | /* schedule PACKET UPLINK ACK */ |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 142 | if (!msg && ul_ack_tbf) { |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 143 | tbf = ul_ack_tbf; |
| 144 | msg = gprs_rlcmac_send_uplink_ack(tbf, fn); |
| 145 | } |
| 146 | if (msg) { |
| 147 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control " |
| 148 | "message at RTS for %s TBF=%d (TRX=%d, TS=%d)\n", |
| 149 | (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 150 | ? "UL" : "DL", tbf->tfi, trx, ts); |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 151 | } |
Andreas Eversberg | 3b7461c | 2012-07-20 11:19:59 +0200 | [diff] [blame] | 152 | /* schedule PACKET PAGING REQUEST */ |
| 153 | if (!msg && !llist_empty(&pdch->paging_list)) { |
| 154 | msg = gprs_rlcmac_send_packet_paging_request(pdch); |
| 155 | if (msg) |
| 156 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling paging " |
| 157 | "request message at RTS for (TRX=%d, TS=%d)\n", |
| 158 | trx, ts); |
| 159 | } |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 160 | |
| 161 | /* Prio 2: select data message for downlink */ |
| 162 | if (!msg) { |
| 163 | /* select downlink ressource */ |
| 164 | for (i = 0, tfi = pdch->next_dl_tfi; i < 32; |
| 165 | i++, tfi = (tfi + 1) & 31) { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 166 | tbf = pdch->dl_tbf[tfi]; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 167 | /* no TBF for this tfi, go next */ |
| 168 | if (!tbf) |
| 169 | continue; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 170 | /* no DL TBF, go next */ |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 171 | if (tbf->direction != GPRS_RLCMAC_DL_TBF) |
| 172 | continue; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 173 | /* no DL ressources needed, go next */ |
| 174 | if (tbf->state != GPRS_RLCMAC_FLOW |
| 175 | && tbf->state != GPRS_RLCMAC_FINISHED) |
| 176 | continue; |
| 177 | |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 178 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling data " |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 179 | "message at RTS for DL TBF=%d (TRX=%d, " |
| 180 | "TS=%d)\n", tfi, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 181 | /* next TBF to handle ressource is the next one */ |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 182 | pdch->next_dl_tfi = (tfi + 1) & 31; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 183 | /* generate DL data block */ |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 184 | msg = gprs_rlcmac_send_data_block_acknowledged(tbf, fn, |
| 185 | ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 186 | break; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 187 | } |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | /* Prio 3: send dummy contol message */ |
| 191 | if (!msg) { |
| 192 | msg = msgb_alloc(23, "rlcmac_dl_idle"); |
| 193 | if (!msg) |
| 194 | return -ENOMEM; |
| 195 | memcpy(msgb_put(msg, 23), rlcmac_dl_idle, 23); |
| 196 | } |
| 197 | /* msg is now available */ |
| 198 | |
| 199 | /* set USF */ |
| 200 | msg->data[0] = (msg->data[0] & 0xf8) | usf; |
| 201 | |
| 202 | // printf("len=%d, date=%s\n", msg->len, osmo_hexdump(msg->data, msg->len)); |
| 203 | |
| 204 | /* send PDTCH/PACCH to L1 */ |
| 205 | pcu_l1if_tx_pdtch(msg, trx, ts, arfcn, fn, block_nr); |
| 206 | |
| 207 | return 0; |
| 208 | } |