| /* gprs_rlcmac.cpp |
| * |
| * Copyright (C) 2012 Ivan Klyuchnikov |
| * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <gprs_bssgp_pcu.h> |
| #include <pcu_l1_if.h> |
| #include <gprs_rlcmac.h> |
| |
| LLIST_HEAD(gprs_rlcmac_ul_tbfs); |
| LLIST_HEAD(gprs_rlcmac_dl_tbfs); |
| void *rlcmac_tall_ctx; |
| |
| /* FIXME: spread ressources over multiple TRX. Also add option to use same |
| * TRX in case of existing TBF for TLLI in the other direction. */ |
| /* search for free TFI and return TFI, TRX and first TS */ |
| int tfi_alloc(enum gprs_rlcmac_tbf_direction dir, uint8_t *_trx, uint8_t *_ts, |
| uint8_t use_trx, uint8_t first_ts) |
| { |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| struct gprs_rlcmac_pdch *pdch; |
| struct gprs_rlcmac_tbf **tbfp; |
| uint8_t trx_from, trx_to, trx, ts, tfi; |
| |
| if (use_trx >= 0 && use_trx < 8) |
| trx_from = trx_to = use_trx; |
| else { |
| trx_from = 0; |
| trx_to = 7; |
| } |
| if (first_ts < 0 || first_ts >= 8) |
| first_ts = 0; |
| |
| /* on TRX find first enabled TS */ |
| for (trx = trx_from; trx <= trx_to; trx++) { |
| for (ts = first_ts; ts < 8; ts++) { |
| pdch = &bts->trx[trx].pdch[ts]; |
| if (!pdch->enable) |
| continue; |
| break; |
| } |
| if (ts < 8) |
| break; |
| } |
| if (trx > trx_to) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n"); |
| return -EINVAL; |
| } |
| |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "Searching for first unallocated TFI: " |
| "TRX=%d first TS=%d\n", trx, ts); |
| if (dir == GPRS_RLCMAC_UL_TBF) |
| tbfp = pdch->ul_tbf; |
| else |
| tbfp = pdch->dl_tbf; |
| for (tfi = 0; tfi < 32; tfi++) { |
| if (!tbfp[tfi]) |
| break; |
| } |
| |
| if (tfi < 32) { |
| LOGP(DRLCMAC, LOGL_DEBUG, " Found TFI=%d.\n", tfi); |
| *_trx = trx; |
| *_ts = ts; |
| return tfi; |
| } |
| LOGP(DRLCMAC, LOGL_NOTICE, "No TFI available.\n"); |
| |
| return -1; |
| } |
| |
| static inline int8_t find_free_usf(struct gprs_rlcmac_pdch *pdch, uint8_t ts) |
| { |
| struct gprs_rlcmac_tbf *tbf; |
| uint8_t usf_map = 0; |
| uint8_t tfi, usf; |
| |
| /* make map of used USF */ |
| for (tfi = 0; tfi < 32; tfi++) { |
| tbf = pdch->ul_tbf[tfi]; |
| if (!tbf) |
| continue; |
| usf_map |= (1 << tbf->dir.ul.usf[ts]); |
| } |
| |
| /* look for USF, don't use USF=7 */ |
| for (usf = 0; usf < 7; usf++) { |
| if (!(usf_map & (1 << usf))) |
| return usf; |
| } |
| |
| return -1; |
| } |
| |
| /* lookup TBF Entity (by TFI) */ |
| struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi, uint8_t trx, uint8_t ts, |
| enum gprs_rlcmac_tbf_direction dir) |
| { |
| struct gprs_rlcmac_tbf *tbf; |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| |
| if (tfi >= 32 || trx >= 8 || ts >= 8) |
| return NULL; |
| |
| if (dir == GPRS_RLCMAC_UL_TBF) |
| tbf = bts->trx[trx].pdch[ts].ul_tbf[tfi]; |
| else |
| tbf = bts->trx[trx].pdch[ts].dl_tbf[tfi]; |
| if (!tbf) |
| return NULL; |
| |
| if (tbf->state != GPRS_RLCMAC_RELEASING) |
| return tbf; |
| |
| return NULL; |
| } |
| |
| /* search for active downlink or uplink tbf */ |
| struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli, |
| enum gprs_rlcmac_tbf_direction dir) |
| { |
| struct gprs_rlcmac_tbf *tbf; |
| if (dir == GPRS_RLCMAC_UL_TBF) { |
| llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) { |
| if (tbf->state != GPRS_RLCMAC_RELEASING |
| && tbf->tlli == tlli) |
| return tbf; |
| } |
| } else { |
| llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) { |
| if (tbf->state != GPRS_RLCMAC_RELEASING |
| && tbf->tlli == tlli) |
| return tbf; |
| } |
| } |
| return NULL; |
| } |
| |
| struct gprs_rlcmac_tbf *tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts) |
| { |
| struct gprs_rlcmac_tbf *tbf; |
| |
| /* only one TBF can poll on specific TS/FN, because scheduler can only |
| * schedule one downlink control block (with polling) at a FN per TS */ |
| llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) { |
| if (tbf->state != GPRS_RLCMAC_RELEASING |
| && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED |
| && tbf->poll_fn == fn && tbf->trx == trx |
| && tbf->control_ts == ts) |
| return tbf; |
| } |
| llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) { |
| if (tbf->state != GPRS_RLCMAC_RELEASING |
| && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED |
| && tbf->poll_fn == fn && tbf->trx == trx |
| && tbf->control_ts == ts) |
| return tbf; |
| } |
| return NULL; |
| } |
| |
| struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_tbf *old_tbf, |
| enum gprs_rlcmac_tbf_direction dir, uint8_t tfi, uint8_t trx, |
| uint8_t first_ts, uint8_t ms_class, uint8_t single_slot) |
| { |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| struct gprs_rlcmac_tbf *tbf; |
| int rc; |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF starts here **********\n"); |
| LOGP(DRLCMAC, LOGL_INFO, "Allocating %s TBF: TFI=%d TRX=%d " |
| "MS_CLASS=%d\n", (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| tfi, trx, ms_class); |
| |
| if (trx >= 8 || first_ts >= 8 || tfi >= 32) |
| return NULL; |
| |
| tbf = talloc_zero(rlcmac_tall_ctx, struct gprs_rlcmac_tbf); |
| if (!tbf) |
| return NULL; |
| |
| tbf->direction = dir; |
| tbf->tfi = tfi; |
| tbf->trx = trx; |
| tbf->arfcn = bts->trx[trx].arfcn; |
| tbf->first_ts = first_ts; |
| tbf->ms_class = ms_class; |
| tbf->ws = 64; |
| tbf->sns = 128; |
| /* select algorithm A in case we don't have multislot class info */ |
| if (single_slot || ms_class == 0) |
| rc = alloc_algorithm_a(old_tbf, tbf, |
| bts->alloc_algorithm_curst); |
| else |
| rc = bts->alloc_algorithm(old_tbf, tbf, |
| bts->alloc_algorithm_curst); |
| /* if no ressource */ |
| if (rc < 0) { |
| talloc_free(tbf); |
| return NULL; |
| } |
| /* assign control ts */ |
| tbf->control_ts = 0xff; |
| rc = tbf_assign_control_ts(tbf); |
| /* if no ressource */ |
| if (rc < 0) { |
| talloc_free(tbf); |
| return NULL; |
| } |
| |
| INIT_LLIST_HEAD(&tbf->llc_queue); |
| if (dir == GPRS_RLCMAC_UL_TBF) |
| llist_add(&tbf->list, &gprs_rlcmac_ul_tbfs); |
| else |
| llist_add(&tbf->list, &gprs_rlcmac_dl_tbfs); |
| |
| return tbf; |
| } |
| |
| /* Slot Allocation: Algorithm A |
| * |
| * Assign single slot for uplink and downlink |
| */ |
| int alloc_algorithm_a(struct gprs_rlcmac_tbf *old_tbf, |
| struct gprs_rlcmac_tbf *tbf, uint32_t cust) |
| { |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| struct gprs_rlcmac_pdch *pdch; |
| uint8_t ts = tbf->first_ts; |
| int8_t usf; /* must be signed */ |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm A) for class " |
| "%d\n", tbf->ms_class); |
| |
| pdch = &bts->trx[tbf->trx].pdch[ts]; |
| if (!pdch->enable) { |
| LOGP(DRLCMAC, LOGL_ERROR, "TS=%d not enabled.", ts); |
| return -EIO; |
| } |
| tbf->tsc = pdch->tsc; |
| if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| /* if TFI is free on TS */ |
| if (!pdch->ul_tbf[tbf->tfi]) { |
| /* if USF available */ |
| usf = find_free_usf(pdch, ts); |
| if (usf >= 0) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "- Assign uplink " |
| "TS=%d USF=%d\n", ts, usf); |
| pdch->ul_tbf[tbf->tfi] = tbf; |
| tbf->pdch[ts] = pdch; |
| } else { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Failed " |
| "allocating TS=%d, no USF available\n", |
| ts); |
| return -EBUSY; |
| } |
| } else { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Failed allocating " |
| "TS=%d, TFI is not available\n", ts); |
| return -EBUSY; |
| } |
| } else { |
| /* if TFI is free on TS */ |
| if (!pdch->dl_tbf[tbf->tfi]) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "- Assign downlink TS=%d\n", |
| ts); |
| pdch->dl_tbf[tbf->tfi] = tbf; |
| tbf->pdch[ts] = pdch; |
| } else { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Failed allocating " |
| "TS=%d, TFI is not available\n", ts); |
| return -EBUSY; |
| } |
| } |
| /* the only one TS is the common TS */ |
| tbf->first_common_ts = ts; |
| |
| return 0; |
| } |
| |
| static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf) |
| { |
| struct gprs_rlcmac_pdch *pdch; |
| int ts; |
| |
| if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| for (ts = 0; ts < 8; ts++) { |
| pdch = tbf->pdch[ts]; |
| if (pdch) |
| pdch->ul_tbf[tbf->tfi] = NULL; |
| tbf->pdch[ts] = NULL; |
| } |
| } else { |
| for (ts = 0; ts < 8; ts++) { |
| pdch = tbf->pdch[ts]; |
| if (pdch) |
| pdch->dl_tbf[tbf->tfi] = NULL; |
| tbf->pdch[ts] = NULL; |
| } |
| } |
| } |
| |
| void tbf_free(struct gprs_rlcmac_tbf *tbf) |
| { |
| struct msgb *msg; |
| |
| LOGP(DRLCMAC, LOGL_INFO, "Free %s TBF=%d with TLLI=0x%08x.\n", |
| (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, |
| tbf->tlli); |
| if (tbf->ul_ass_state != GPRS_RLCMAC_UL_ASS_NONE) |
| LOGP(DRLCMAC, LOGL_ERROR, "Software error: Pending uplink " |
| "assignment. This may not happen, because the " |
| "assignment message never gets transmitted. Please " |
| "be shure not to free in this state. PLEASE FIX!\n"); |
| if (tbf->dl_ass_state != GPRS_RLCMAC_DL_ASS_NONE) |
| LOGP(DRLCMAC, LOGL_ERROR, "Software error: Pending downlink " |
| "assignment. This may not happen, because the " |
| "assignment message never gets transmitted. Please " |
| "be shure not to free in this state. PLEASE FIX!\n"); |
| tbf_timer_stop(tbf); |
| while ((msg = msgb_dequeue(&tbf->llc_queue))) |
| msgb_free(msg); |
| tbf_unlink_pdch(tbf); |
| llist_del(&tbf->list); |
| LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF ends here **********\n"); |
| talloc_free(tbf); |
| } |
| |
| int tbf_update(struct gprs_rlcmac_tbf *tbf) |
| { |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| struct gprs_rlcmac_tbf *ul_tbf = NULL; |
| int rc; |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF update **********\n"); |
| |
| if (tbf->direction != GPRS_RLCMAC_DL_TBF) |
| return -EINVAL; |
| |
| if (!tbf->ms_class) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "- Cannot update, no class\n"); |
| return -EINVAL; |
| } |
| |
| if (tbf->tlli_valid) |
| ul_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| |
| tbf_unlink_pdch(tbf); |
| rc = bts->alloc_algorithm(ul_tbf, tbf, bts->alloc_algorithm_curst); |
| /* if no ressource */ |
| if (rc < 0) { |
| LOGP(DRLCMAC, LOGL_ERROR, "No ressource after update???\n"); |
| return -rc; |
| } |
| |
| return 0; |
| } |
| |
| int tbf_assign_control_ts(struct gprs_rlcmac_tbf *tbf) |
| { |
| if (tbf->control_ts == 0xff) |
| LOGP(DRLCMAC, LOGL_DEBUG, "- Setting Control TS %d\n", |
| tbf->control_ts); |
| else if (tbf->control_ts != tbf->first_common_ts) |
| LOGP(DRLCMAC, LOGL_DEBUG, "- Changing Control TS %d\n", |
| tbf->control_ts); |
| tbf->control_ts = tbf->first_common_ts; |
| |
| return 0; |
| } |
| |
| |
| const char *tbf_state_name[] = { |
| "NULL", |
| "ASSIGN", |
| "FLOW", |
| "FINISHED", |
| "WAIT RELEASE", |
| "RELEASING", |
| }; |
| |
| void tbf_new_state(struct gprs_rlcmac_tbf *tbf, |
| enum gprs_rlcmac_tbf_state state) |
| { |
| LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d changes state from %s to %s\n", |
| (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, |
| tbf_state_name[tbf->state], tbf_state_name[state]); |
| tbf->state = state; |
| } |
| |
| void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T, |
| unsigned int seconds, unsigned int microseconds) |
| { |
| if (!osmo_timer_pending(&tbf->timer)) |
| LOGP(DRLCMAC, LOGL_DEBUG, "Starting %s TBF=%d timer %u.\n", |
| (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| tbf->tfi, T); |
| else |
| LOGP(DRLCMAC, LOGL_DEBUG, "Restarting %s TBF=%d timer %u " |
| "while old timer %u pending \n", |
| (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| tbf->tfi, T, tbf->T); |
| |
| tbf->T = T; |
| tbf->num_T_exp = 0; |
| |
| /* Tunning timers can be safely re-scheduled. */ |
| tbf->timer.data = tbf; |
| tbf->timer.cb = &tbf_timer_cb; |
| |
| osmo_timer_schedule(&tbf->timer, seconds, microseconds); |
| } |
| |
| void tbf_timer_stop(struct gprs_rlcmac_tbf *tbf) |
| { |
| if (osmo_timer_pending(&tbf->timer)) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "Stopping %s TBF=%d timer %u.\n", |
| (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| tbf->tfi, tbf->T); |
| osmo_timer_del(&tbf->timer); |
| } |
| } |
| |
| #if 0 |
| static void tbf_gsm_timer_cb(void *_tbf) |
| { |
| struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
| |
| tbf->num_fT_exp++; |
| |
| switch (tbf->fT) { |
| case 0: |
| hier alles berdenken |
| // This is timer for delay RLC/MAC data sending after Downlink Immediate Assignment on CCCH. |
| gprs_rlcmac_segment_llc_pdu(tbf); |
| LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| tbf_free(tbf); |
| break; |
| default: |
| LOGP(DRLCMAC, LOGL_NOTICE, "Timer expired in unknown mode: %u \n", tbf->fT); |
| } |
| } |
| |
| static void tbf_gsm_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int fT, |
| int frames) |
| { |
| if (osmo_gsm_timer_pending(&tbf->gsm_timer)) |
| LOGP(DRLCMAC, LOGL_NOTICE, "Starting TBF timer %u while old timer %u pending \n", fT, tbf->fT); |
| tbf->fT = fT; |
| tbf->num_fT_exp = 0; |
| |
| /* FIXME: we should do this only once ? */ |
| tbf->gsm_timer.data = tbf; |
| tbf->gsm_timer.cb = &tbf_gsm_timer_cb; |
| |
| osmo_gsm_timer_schedule(&tbf->gsm_timer, frames); |
| } |
| |
| eine stop-funktion, auch im tbf_free aufrufen |
| |
| #endif |
| |
| #if 0 |
| void gprs_rlcmac_enqueue_block(bitvec *block, int len) |
| { |
| struct msgb *msg = msgb_alloc(len, "rlcmac_dl"); |
| bitvec_pack(block, msgb_put(msg, len)); |
| msgb_enqueue(&block_queue, msg); |
| } |
| #endif |
| |
| /* received RLC/MAC block from L1 */ |
| int gprs_rlcmac_rcv_block(uint8_t trx, uint8_t ts, uint8_t *data, uint8_t len, |
| uint32_t fn) |
| { |
| unsigned payload = data[0] >> 6; |
| bitvec *block; |
| int rc = 0; |
| |
| switch (payload) { |
| case GPRS_RLCMAC_DATA_BLOCK: |
| rc = gprs_rlcmac_rcv_data_block_acknowledged(trx, ts, data, |
| len); |
| break; |
| case GPRS_RLCMAC_CONTROL_BLOCK: |
| block = bitvec_alloc(len); |
| if (!block) |
| return -ENOMEM; |
| bitvec_unpack(block, data); |
| rc = gprs_rlcmac_rcv_control_block(block, trx, ts, fn); |
| bitvec_free(block); |
| break; |
| case GPRS_RLCMAC_CONTROL_BLOCK_OPT: |
| LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n"); |
| default: |
| LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload.\n"); |
| rc = -EINVAL; |
| } |
| |
| return rc; |
| } |
| |
| // GSM 04.08 9.1.18 Immediate assignment |
| int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, |
| uint32_t fn, uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, |
| uint8_t tfi, uint8_t usf, uint32_t tlli, |
| uint8_t polling, uint32_t poll_fn) |
| { |
| unsigned wp = 0; |
| uint8_t plen; |
| |
| bitvec_write_field(dest, wp,0x0,4); // Skip Indicator |
| bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator |
| bitvec_write_field(dest, wp,0x3F,8); // Immediate Assignment Message Type |
| |
| // 10.5.2.25b Dedicated mode or TBF |
| bitvec_write_field(dest, wp,0x0,1); // spare |
| bitvec_write_field(dest, wp,0x0,1); // TMA : Two-message assignment: No meaning |
| bitvec_write_field(dest, wp,downlink,1); // Downlink : Downlink assignment to mobile in packet idle mode |
| bitvec_write_field(dest, wp,0x1,1); // T/D : TBF or dedicated mode: this message assigns a Temporary Block Flow (TBF). |
| |
| bitvec_write_field(dest, wp,0x0,4); // Page Mode |
| |
| // GSM 04.08 10.5.2.25a Packet Channel Description |
| bitvec_write_field(dest, wp,0x1,5); // Channel type |
| bitvec_write_field(dest, wp,ts,3); // TN |
| bitvec_write_field(dest, wp,tsc,3); // TSC |
| bitvec_write_field(dest, wp,0x0,3); // non-hopping RF channel configuraion |
| bitvec_write_field(dest, wp,arfcn,10); // ARFCN |
| |
| //10.5.2.30 Request Reference |
| bitvec_write_field(dest, wp,ra,8); // RA |
| bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1' |
| bitvec_write_field(dest, wp,fn % 51,6); // T3 |
| bitvec_write_field(dest, wp,fn % 26,5); // T2 |
| |
| // 10.5.2.40 Timing Advance |
| bitvec_write_field(dest, wp,0x0,2); // spare |
| bitvec_write_field(dest, wp,ta,6); // Timing Advance value |
| |
| // No mobile allocation in non-hopping systems. |
| // A zero-length LV. Just write L=0. |
| bitvec_write_field(dest, wp,0,8); |
| |
| if ((wp % 8)) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "Length of IMM.ASS without rest " |
| "octets is not multiple of 8 bits, PLEASE FIX!\n"); |
| exit (0); |
| } |
| plen = wp / 8; |
| |
| if (downlink) |
| { |
| // GSM 04.08 10.5.2.16 IA Rest Octets |
| bitvec_write_field(dest, wp, 3, 2); // "HH" |
| bitvec_write_field(dest, wp, 1, 2); // "01" Packet Downlink Assignment |
| bitvec_write_field(dest, wp,tlli,32); // TLLI |
| bitvec_write_field(dest, wp,0x1,1); // switch TFI : on |
| bitvec_write_field(dest, wp,tfi,5); // TFI |
| bitvec_write_field(dest, wp,0x0,1); // RLC acknowledged mode |
| bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| bitvec_write_field(dest, wp,0x0,5); // GAMMA power control parameter |
| bitvec_write_field(dest, wp,polling,1); // Polling Bit |
| bitvec_write_field(dest, wp,!polling,1); // TA_VALID ??? |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| bitvec_write_field(dest, wp,0x0,4); // TIMING_ADVANCE_INDEX |
| if (polling) { |
| bitvec_write_field(dest, wp,0x1,1); // TBF Starting TIME present |
| bitvec_write_field(dest, wp,(poll_fn / (26 * 51)) % 32,5); // T1' |
| bitvec_write_field(dest, wp,poll_fn % 51,6); // T3 |
| bitvec_write_field(dest, wp,poll_fn % 26,5); // T2 |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME present |
| } |
| bitvec_write_field(dest, wp,0x0,1); // P0 not present |
| // bitvec_write_field(dest, wp,0x1,1); // P0 not present |
| // bitvec_write_field(dest, wp,0xb,4); |
| } |
| else |
| { |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| // GMS 04.08 10.5.2.37b 10.5.2.16 |
| bitvec_write_field(dest, wp, 3, 2); // "HH" |
| bitvec_write_field(dest, wp, 0, 2); // "0" Packet Uplink Assignment |
| bitvec_write_field(dest, wp, 1, 1); // Block Allocation : Not Single Block Allocation |
| bitvec_write_field(dest, wp, tfi, 5); // TFI_ASSIGNMENT Temporary Flow Identity |
| bitvec_write_field(dest, wp, 0, 1); // POLLING |
| bitvec_write_field(dest, wp, 0, 1); // ALLOCATION_TYPE: dynamic |
| bitvec_write_field(dest, wp, usf, 3); // USF |
| bitvec_write_field(dest, wp, 0, 1); // USF_GRANULARITY |
| bitvec_write_field(dest, wp, 0 , 1); // "0" power control: Not Present |
| bitvec_write_field(dest, wp, bts->initial_cs-1, 2); // CHANNEL_CODING_COMMAND |
| bitvec_write_field(dest, wp, 1, 1); // TLLI_BLOCK_CHANNEL_CODING |
| bitvec_write_field(dest, wp, 1 , 1); // "1" Alpha : Present |
| bitvec_write_field(dest, wp, 0, 4); // Alpha |
| bitvec_write_field(dest, wp, 0, 5); // Gamma |
| bitvec_write_field(dest, wp, 0, 1); // TIMING_ADVANCE_INDEX_FLAG |
| bitvec_write_field(dest, wp, 0, 1); // TBF_STARTING_TIME_FLAG |
| } |
| |
| return plen; |
| } |
| |
| /* generate uplink assignment */ |
| void write_packet_uplink_assignment(bitvec * dest, uint8_t old_tfi, |
| uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli, |
| struct gprs_rlcmac_tbf *tbf, uint8_t poll) |
| { |
| // TODO We should use our implementation of encode RLC/MAC Control messages. |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| unsigned wp = 0; |
| uint8_t ts; |
| |
| bitvec_write_field(dest, wp,0x1,2); // Payload Type |
| bitvec_write_field(dest, wp,0x0,2); // Uplink block with TDMA framenumber (N+13) |
| bitvec_write_field(dest, wp,poll,1); // Suppl/Polling Bit |
| bitvec_write_field(dest, wp,0x0,3); // Uplink state flag |
| bitvec_write_field(dest, wp,0xa,6); // MESSAGE TYPE |
| |
| bitvec_write_field(dest, wp,0x0,2); // Page Mode |
| |
| bitvec_write_field(dest, wp,0x0,1); // switch PERSIST_LEVEL: off |
| if (use_tlli) { |
| bitvec_write_field(dest, wp,0x2,2); // switch TLLI : on |
| bitvec_write_field(dest, wp,tlli,32); // TLLI |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // switch TFI : on |
| bitvec_write_field(dest, wp,old_downlink,1); // 0=UPLINK TFI, 1=DL TFI |
| bitvec_write_field(dest, wp,old_tfi,5); // TFI |
| } |
| |
| bitvec_write_field(dest, wp,0x0,1); // Message escape |
| bitvec_write_field(dest, wp,bts->initial_cs-1, 2); // CHANNEL_CODING_COMMAND |
| bitvec_write_field(dest, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING |
| |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on |
| bitvec_write_field(dest, wp,tbf->ta,6); // TIMING_ADVANCE_VALUE |
| bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| |
| #if 1 |
| bitvec_write_field(dest, wp,0x1,1); // Frequency Parameters information elements = present |
| bitvec_write_field(dest, wp,tbf->tsc,3); // Training Sequence Code (TSC) |
| bitvec_write_field(dest, wp,0x0,2); // ARFCN = present |
| bitvec_write_field(dest, wp,tbf->arfcn,10); // ARFCN |
| #else |
| bitvec_write_field(dest, wp,0x0,1); // Frequency Parameters = off |
| #endif |
| |
| bitvec_write_field(dest, wp,0x1,2); // Dynamic Allocation |
| |
| bitvec_write_field(dest, wp,0x0,1); // Extended Dynamic Allocation = off |
| bitvec_write_field(dest, wp,0x0,1); // P0 = off |
| |
| bitvec_write_field(dest, wp,0x0,1); // USF_GRANULARITY |
| bitvec_write_field(dest, wp,0x1,1); // switch TFI : on |
| bitvec_write_field(dest, wp,tbf->tfi,5);// TFI |
| |
| bitvec_write_field(dest, wp,0x0,1); // |
| bitvec_write_field(dest, wp,0x0,1); // TBF Starting Time = off |
| bitvec_write_field(dest, wp,0x0,1); // Timeslot Allocation |
| |
| for (ts = 0; ts < 8; ts++) { |
| if (tbf->pdch[ts]) { |
| bitvec_write_field(dest, wp,0x1,1); // USF_TN(i): on |
| bitvec_write_field(dest, wp,tbf->dir.ul.usf[ts],3); // USF_TN(i) |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // USF_TN(i): off |
| } |
| // bitvec_write_field(dest, wp,0x0,1); // Measurement Mapping struct not present |
| } |
| |
| |
| /* generate downlink assignment */ |
| void write_packet_downlink_assignment(RlcMacDownlink_t * block, uint8_t old_tfi, |
| uint8_t old_downlink, struct gprs_rlcmac_tbf *tbf, uint8_t poll) |
| { |
| // Packet downlink assignment TS 44.060 11.2.7 |
| |
| uint8_t tn; |
| |
| block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
| block->RRBP = 0x0; // N+13 |
| block->SP = poll; // RRBP field is valid |
| block->USF = 0x0; // Uplink state flag |
| |
| block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment |
| block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging |
| |
| block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off |
| |
| block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on |
| block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = old_downlink; // 0=UPLINK TFI, 1=DL TFI |
| block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = old_tfi; // TFI |
| |
| block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation |
| block->u.Packet_Downlink_Assignment.RLC_MODE = 0x0; // RLC acknowledged mode |
| block->u.Packet_Downlink_Assignment.CONTROL_ACK = old_downlink; // NW establishes no new DL TBF for the MS with running timer T3192 |
| block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0; // timeslot(s) |
| for (tn = 0; tn < 8; tn++) { |
| if (tbf->pdch[tn]) |
| block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION |= 0x80 >> tn; // timeslot(s) |
| } |
| |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = tbf->ta; // TIMING_ADVANCE_VALUE |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off |
| |
| block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off |
| |
| block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.TSC = tbf->tsc; // Training Sequence Code (TSC) |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.UnionType = 0x0; // ARFCN = on |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.u.ARFCN = tbf->arfcn; // ARFCN |
| |
| block->u.Packet_Downlink_Assignment.Exist_DOWNLINK_TFI_ASSIGNMENT = 0x1; // DOWNLINK TFI ASSIGNMENT = on |
| block->u.Packet_Downlink_Assignment.DOWNLINK_TFI_ASSIGNMENT = tbf->tfi; // TFI |
| |
| block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = 0x0; // ALPHA |
| |
| for (tn = 0; tn < 8; tn++) |
| { |
| if (tbf->pdch[tn]) |
| { |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x1; // Slot[i] = on |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].GAMMA_TN = 0x0; // GAMMA_TN |
| } |
| else |
| { |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x0; // Slot[i] = off |
| } |
| } |
| |
| block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off |
| block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off |
| block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off |
| } |
| |
| /* generate uplink ack */ |
| void write_packet_uplink_ack(RlcMacDownlink_t * block, struct gprs_rlcmac_tbf *tbf, |
| uint8_t final) |
| { |
| // Packet Uplink Ack/Nack TS 44.060 11.2.28 |
| |
| char show_v_n[65]; |
| |
| uint8_t rbb = 0; |
| uint16_t i, bbn; |
| uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| char bit; |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, "Sending Ack/Nack for TBF=%d " |
| "(final=%d)\n", tbf->tfi, final); |
| |
| block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
| block->RRBP = 0x0; // N+13 |
| block->SP = final; // RRBP field is valid, if it is final ack |
| block->USF = 0x0; // Uplink state flag |
| |
| block->u.Packet_Uplink_Ack_Nack.MESSAGE_TYPE = 0x9; // Packet Downlink Assignment |
| block->u.Packet_Uplink_Ack_Nack.PAGE_MODE = 0x0; // Normal Paging |
| block->u.Packet_Uplink_Ack_Nack.UPLINK_TFI = tbf->tfi; // Uplink TFI |
| |
| block->u.Packet_Uplink_Ack_Nack.UnionType = 0x0; // PU_AckNack_GPRS = on |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.CHANNEL_CODING_COMMAND = 0x0; // CS1 |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.FINAL_ACK_INDICATION = final; // FINAL ACK INDICATION |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER = tbf->dir.ul.v_r; // STARTING_SEQUENCE_NUMBER |
| // RECEIVE_BLOCK_BITMAP |
| for (i = 0, bbn = (tbf->dir.ul.v_r - 64) & mod_sns_half; i < 64; |
| i++, bbn = (bbn + 1) & mod_sns_half) { |
| bit = tbf->dir.ul.v_n[bbn]; |
| if (bit == 0) |
| bit = ' '; |
| show_v_n[i] = bit; |
| if (bit == 'R') |
| rbb = (rbb << 1)|1; |
| else |
| rbb = (rbb << 1); |
| if((i%8) == 7) |
| { |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP[i/8] = rbb; |
| rbb = 0; |
| } |
| } |
| show_v_n[64] = '\0'; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- V(N): \"%s\" R=Received " |
| "N=Not-Received\n", show_v_n); |
| |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.UnionType = 0x0; // Fixed Allocation Dummy = on |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.u.FixedAllocationDummy = 0x0; // Fixed Allocation Dummy |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off |
| |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_CONTENTION_RESOLUTION_TLLI = 0x1; |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.CONTENTION_RESOLUTION_TLLI = tbf->tlli; |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Packet_Timing_Advance = 0x0; |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Extension_Bits = 0x0; |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Power_Control_Parameters = 0x0; |
| } |
| |
| /* Send Uplink unit-data to SGSN. */ |
| int gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf) |
| { |
| const uint8_t qos_profile = QOS_PROFILE; |
| struct msgb *llc_pdu; |
| unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + tbf->llc_index; |
| |
| LOGP(DBSSGP, LOGL_INFO, "LLC [PCU -> SGSN] TFI: %u TLLI: 0x%08x len=%d\n", tbf->tfi, tbf->tlli, tbf->llc_index); |
| if (!bctx) { |
| LOGP(DBSSGP, LOGL_ERROR, "No bctx\n"); |
| return -EIO; |
| } |
| |
| llc_pdu = msgb_alloc_headroom(msg_len, msg_len,"llc_pdu"); |
| msgb_tvlv_push(llc_pdu, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*tbf->llc_index, tbf->llc_frame); |
| bssgp_tx_ul_ud(bctx, tbf->tlli, &qos_profile, llc_pdu); |
| |
| return 0; |
| } |