| /* Copied from gprs_bssgp_pcu.cpp |
| * |
| * Copyright (C) 2012 Ivan Klyuchnikov |
| * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| * Copyright (C) 2013 by Holger Hans Peter Freyther |
| * |
| * 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 <bts.h> |
| #include <tbf.h> |
| #include <rlc.h> |
| #include <gprs_rlcmac.h> |
| #include <gprs_debug.h> |
| |
| extern "C" { |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/talloc.h> |
| } |
| |
| #include <errno.h> |
| #include <string.h> |
| |
| extern "C" { |
| int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| uint8_t num_frames, uint32_t num_octets); |
| } |
| |
| extern void *tall_pcu_ctx; |
| |
| static void tbf_timer_cb(void *_tbf); |
| |
| inline gprs_rlcmac_bts *gprs_rlcmac_tbf::bts_data() const |
| { |
| return bts->bts_data(); |
| } |
| |
| static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, |
| const uint8_t ms_class) |
| { |
| if (!tbf->ms_class && ms_class) |
| tbf->ms_class = ms_class; |
| } |
| |
| static inline void tbf_assign_imsi(struct gprs_rlcmac_tbf *tbf, |
| const char *imsi) |
| { |
| strncpy(tbf->meas.imsi, imsi, sizeof(tbf->meas.imsi) - 1); |
| } |
| |
| static struct gprs_rlcmac_tbf *tbf_lookup_dl(BTS *bts, |
| const uint32_t tlli, const char *imsi) |
| { |
| /* TODO: look up by IMSI first, then tlli, then old_tlli */ |
| return bts->tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
| } |
| |
| static int tbf_append_data(struct gprs_rlcmac_tbf *tbf, |
| struct gprs_rlcmac_bts *bts, |
| const uint8_t ms_class, |
| const uint16_t pdu_delay_csec, |
| const uint8_t *data, const uint16_t len) |
| { |
| LOGP(DRLCMAC, LOGL_INFO, "TBF: APPEND TFI: %u TLLI: 0x%08x\n", tbf->tfi, tbf->tlli); |
| if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE)) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "TBF in WAIT RELEASE state " |
| "(T3193), so reuse TBF\n"); |
| memcpy(tbf->llc_frame, data, len); |
| tbf->llc_length = len; |
| /* reset rlc states */ |
| memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); |
| /* keep to flags */ |
| tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| tbf_update_ms_class(tbf, ms_class); |
| tbf->update(); |
| gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL); |
| } else { |
| /* the TBF exists, so we must write it in the queue |
| * we prepend lifetime in front of PDU */ |
| struct timeval *tv; |
| struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv), |
| "llc_pdu_queue"); |
| if (!llc_msg) |
| return -ENOMEM; |
| tv = (struct timeval *)msgb_put(llc_msg, sizeof(*tv)); |
| |
| uint16_t delay_csec; |
| if (bts->force_llc_lifetime) |
| delay_csec = bts->force_llc_lifetime; |
| else |
| delay_csec = pdu_delay_csec; |
| /* keep timestap at 0 for infinite delay */ |
| if (delay_csec != 0xffff) { |
| /* calculate timestamp of timeout */ |
| gettimeofday(tv, NULL); |
| tv->tv_usec += (delay_csec % 100) * 10000; |
| tv->tv_sec += delay_csec / 100; |
| if (tv->tv_usec > 999999) { |
| tv->tv_usec -= 1000000; |
| tv->tv_sec++; |
| } |
| } |
| memcpy(msgb_put(llc_msg, len), data, len); |
| msgb_enqueue(&tbf->llc_queue, llc_msg); |
| tbf_update_ms_class(tbf, ms_class); |
| } |
| |
| return 0; |
| } |
| |
| static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, |
| const char *imsi, |
| const uint32_t tlli, const uint8_t ms_class, |
| const uint8_t *data, const uint16_t len) |
| { |
| uint8_t trx, ta, ss; |
| int8_t use_trx; |
| struct gprs_rlcmac_tbf *old_tbf, *tbf; |
| int8_t tfi; /* must be signed */ |
| int rc; |
| |
| /* check for uplink data, so we copy our informations */ |
| #warning "Do the same look up for IMSI, TLLI and OLD_TLLI" |
| #warning "Refactor the below lines... into a new method" |
| tbf = bts->bts->tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
| if (tbf && tbf->dir.ul.contention_resolution_done |
| && !tbf->dir.ul.final_ack_sent) { |
| use_trx = tbf->trx_no; |
| ta = tbf->ta; |
| ss = 0; |
| old_tbf = tbf; |
| } else { |
| use_trx = -1; |
| /* we already have an uplink TBF, so we use that TA */ |
| if (tbf) |
| ta = tbf->ta; |
| else { |
| /* recall TA */ |
| rc = bts->bts->timing_advance()->recall(tlli); |
| if (rc < 0) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "TA unknown" |
| ", assuming 0\n"); |
| ta = 0; |
| } else |
| ta = rc; |
| } |
| ss = 1; /* PCH assignment only allows one timeslot */ |
| old_tbf = NULL; |
| } |
| |
| // Create new TBF (any TRX) |
| #warning "Copy and paste with alloc_ul_tbf" |
| tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_DL_TBF, &trx, use_trx); |
| if (tfi < 0) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
| /* FIXME: send reject */ |
| return -EBUSY; |
| } |
| /* set number of downlink slots according to multislot class */ |
| tbf = tbf_alloc(bts, tbf, GPRS_RLCMAC_DL_TBF, tfi, trx, ms_class, ss); |
| if (!tbf) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| /* FIXME: send reject */ |
| return -EBUSY; |
| } |
| tbf->tlli = tlli; |
| tbf->tlli_valid = 1; |
| tbf->ta = ta; |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, |
| "TBF: [DOWNLINK] START TFI: %d TLLI: 0x%08x \n", |
| tbf->tfi, tbf->tlli); |
| |
| /* new TBF, so put first frame */ |
| memcpy(tbf->llc_frame, data, len); |
| tbf->llc_length = len; |
| |
| /* trigger downlink assignment and set state to ASSIGN. |
| * we don't use old_downlink, so the possible uplink is used |
| * to trigger downlink assignment. if there is no uplink, |
| * AGCH is used. */ |
| gprs_rlcmac_trigger_downlink_assignment(tbf, old_tbf, imsi); |
| |
| /* store IMSI for debugging purpose. TODO: it is more than debugging */ |
| tbf_assign_imsi(tbf, imsi); |
| return 0; |
| } |
| |
| /** |
| * TODO: split into unit test-able parts... |
| */ |
| int tbf_handle(struct gprs_rlcmac_bts *bts, |
| const uint32_t tlli, const char *imsi, |
| const uint8_t ms_class, const uint16_t delay_csec, |
| const uint8_t *data, const uint16_t len) |
| { |
| struct gprs_rlcmac_tbf *tbf; |
| |
| /* check for existing TBF */ |
| tbf = tbf_lookup_dl(bts->bts, tlli, imsi); |
| if (tbf) { |
| int rc = tbf_append_data(tbf, bts, ms_class, |
| delay_csec, data, len); |
| if (rc >= 0) |
| tbf_assign_imsi(tbf, imsi); |
| return rc; |
| } |
| |
| return tbf_new_dl_assignment(bts, imsi, tlli, ms_class, data, len); |
| } |
| |
| struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts, |
| int8_t use_trx, uint8_t ms_class, |
| uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf) |
| { |
| uint8_t trx; |
| struct gprs_rlcmac_tbf *tbf; |
| uint8_t tfi; |
| |
| #warning "Copy and paste with tbf_new_dl_assignment" |
| /* create new TBF, use sme TRX as DL TBF */ |
| tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_UL_TBF, &trx, use_trx); |
| if (tfi < 0) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| /* FIXME: send reject */ |
| return NULL; |
| } |
| /* use multislot class of downlink TBF */ |
| tbf = tbf_alloc(bts, dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ms_class, 0); |
| if (!tbf) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| /* FIXME: send reject */ |
| return NULL; |
| } |
| tbf->tlli = tlli; |
| tbf->tlli_valid = 1; /* no contention resolution */ |
| tbf->dir.ul.contention_resolution_done = 1; |
| tbf->ta = ta; /* use current TA */ |
| tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
| tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| |
| return tbf; |
| } |
| |
| static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf) |
| { |
| struct gprs_rlcmac_pdch *pdch; |
| int ts; |
| |
| if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| tbf->trx->ul_tbf[tbf->tfi] = NULL; |
| for (ts = 0; ts < 8; ts++) { |
| pdch = tbf->pdch[ts]; |
| if (pdch) |
| pdch->ul_tbf[tbf->tfi] = NULL; |
| tbf->pdch[ts] = NULL; |
| } |
| } else { |
| tbf->trx->dl_tbf[tbf->tfi] = NULL; |
| 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; |
| |
| /* Give final measurement report */ |
| gprs_rlcmac_rssi_rep(tbf); |
| gprs_rlcmac_lost_rep(tbf); |
| |
| debug_diagram(tbf->bts, tbf->diag, "+---------------+"); |
| debug_diagram(tbf->bts, tbf->diag, "| THE END |"); |
| debug_diagram(tbf->bts, tbf->diag, "+---------------+"); |
| 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 sure 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 sure not to free in this state. PLEASE FIX!\n"); |
| tbf->stop_timer(); |
| #warning "TODO: Could/Should generate bssgp_tx_llc_discarded" |
| 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 gprs_rlcmac_tbf::update() |
| { |
| struct gprs_rlcmac_tbf *ul_tbf = NULL; |
| struct gprs_rlcmac_bts *bts_data = bts->bts_data(); |
| int rc; |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF update **********\n"); |
| |
| if (direction != GPRS_RLCMAC_DL_TBF) |
| return -EINVAL; |
| |
| if (!ms_class) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "- Cannot update, no class\n"); |
| return -EINVAL; |
| } |
| |
| ul_tbf = bts->tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
| |
| tbf_unlink_pdch(this); |
| rc = bts_data->alloc_algorithm(bts_data, ul_tbf, this, bts_data->alloc_algorithm_curst, 0); |
| /* 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_INFO, "- Setting Control TS %d\n", |
| tbf->first_common_ts); |
| else if (tbf->control_ts != tbf->first_common_ts) |
| LOGP(DRLCMAC, LOGL_INFO, "- Changing Control TS %d\n", |
| tbf->first_common_ts); |
| tbf->control_ts = tbf->first_common_ts; |
| |
| return 0; |
| } |
| |
| static 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) |
| { |
| debug_diagram(tbf->bts, tbf->diag, "->%s", tbf_state_name[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->set_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 gprs_rlcmac_tbf::stop_t3191() |
| { |
| return stop_timer(); |
| } |
| |
| void gprs_rlcmac_tbf::stop_timer() |
| { |
| if (osmo_timer_pending(&timer)) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "Stopping %s TBF=%d timer %u.\n", |
| (direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi, T); |
| osmo_timer_del(&timer); |
| } |
| } |
| |
| void gprs_rlcmac_tbf::poll_timeout() |
| { |
| LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n", |
| (direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi); |
| |
| poll_state = GPRS_RLCMAC_POLL_NONE; |
| |
| if (ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
| if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| "PACKET CONTROL ACK for PACKET UPLINK ACK\n"); |
| rlcmac_diag(); |
| state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| } |
| ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| debug_diagram(bts, this->diag, "timeout UL-ACK"); |
| if (state_is(GPRS_RLCMAC_FINISHED)) { |
| dir.ul.n3103++; |
| if (dir.ul.n3103 == bts->bts_data()->n3103) { |
| LOGP(DRLCMAC, LOGL_NOTICE, |
| "- N3103 exceeded\n"); |
| debug_diagram(bts, diag, "N3103 exceeded"); |
| tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| tbf_timer_start(this, 3169, bts->bts_data()->t3169, 0); |
| return; |
| } |
| /* reschedule UL ack */ |
| ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| } |
| } else if (ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| "PACKET CONTROL ACK for PACKET UPLINK " |
| "ASSIGNMENT.\n"); |
| rlcmac_diag(); |
| state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| } |
| ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| debug_diagram(bts, diag, "timeout UL-ASS"); |
| n3105++; |
| if (n3105 == bts_data()->n3105) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| debug_diagram(bts, diag, "N3105 exceeded"); |
| tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| return; |
| } |
| /* reschedule UL assignment */ |
| ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| } else if (dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| "PACKET CONTROL ACK for PACKET DOWNLINK " |
| "ASSIGNMENT.\n"); |
| rlcmac_diag(); |
| state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| } |
| dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| debug_diagram(bts, diag, "timeout DL-ASS"); |
| n3105++; |
| if (n3105 == bts->bts_data()->n3105) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| debug_diagram(bts, diag, "N3105 exceeded"); |
| tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| return; |
| } |
| /* reschedule DL assignment */ |
| dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| } else if (direction == GPRS_RLCMAC_DL_TBF) { |
| if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| "PACKET DOWNLINK ACK.\n"); |
| rlcmac_diag(); |
| state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| } |
| debug_diagram(bts, diag, "timeout DL-ACK"); |
| n3105++; |
| if (n3105 == bts->bts_data()->n3105) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| debug_diagram(bts, diag, "N3105 exceeded"); |
| tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| return; |
| } |
| /* resend IMM.ASS on CCCH on timeout */ |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| && !(state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " |
| "for TBF=%d on PCH (IMSI=%s)\n", tfi, |
| dir.dl.imsi); |
| /* send immediate assignment */ |
| bts->snd_dl_ass(this, 0, dir.dl.imsi); |
| dir.dl.wait_confirm = 1; |
| } |
| } else |
| LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
| } |
| |
| struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_bts *bts, |
| struct gprs_rlcmac_tbf *old_tbf, enum gprs_rlcmac_tbf_direction dir, |
| uint8_t tfi, uint8_t trx, |
| uint8_t ms_class, uint8_t single_slot) |
| { |
| struct gprs_rlcmac_tbf *tbf; |
| int rc; |
| |
| #ifdef DEBUG_DIAGRAM |
| /* hunt for first free number in diagram */ |
| int diagram_num; |
| for (diagram_num = 0; ; diagram_num++) { |
| llist_for_each_entry(tbf, &bts->ul_tbfs, list) { |
| if (tbf->diag == diagram_num) |
| goto next_diagram; |
| } |
| llist_for_each_entry(tbf, &bts->dl_tbfs, list) { |
| if (tbf->diag == diagram_num) |
| goto next_diagram; |
| } |
| break; |
| next_diagram: |
| continue; |
| } |
| #endif |
| |
| 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 || tfi >= 32) |
| return NULL; |
| |
| tbf = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_tbf); |
| if (!tbf) |
| return NULL; |
| |
| tbf->bts = bts->bts; |
| #ifdef DEBUG_DIAGRAM |
| tbf->diag = diagram_num; |
| #endif |
| tbf->direction = dir; |
| tbf->tfi = tfi; |
| tbf->trx_no = trx; |
| tbf->trx = &bts->trx[trx]; |
| tbf->arfcn = bts->trx[trx].arfcn; |
| tbf->ms_class = ms_class; |
| tbf->ws = 64; |
| tbf->sns = 128; |
| /* select algorithm */ |
| rc = bts->alloc_algorithm(bts, old_tbf, tbf, bts->alloc_algorithm_curst, |
| single_slot); |
| /* 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; |
| } |
| |
| /* set timestamp */ |
| gettimeofday(&tbf->meas.dl_bw_tv, NULL); |
| gettimeofday(&tbf->meas.rssi_tv, NULL); |
| gettimeofday(&tbf->meas.dl_loss_tv, NULL); |
| |
| INIT_LLIST_HEAD(&tbf->llc_queue); |
| if (dir == GPRS_RLCMAC_UL_TBF) |
| llist_add(&tbf->list, &bts->ul_tbfs); |
| else |
| llist_add(&tbf->list, &bts->dl_tbfs); |
| |
| debug_diagram(bts->bts, tbf->diag, "+-----------------+"); |
| debug_diagram(bts->bts, tbf->diag, "|NEW %s TBF TFI=%2d|", |
| (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi); |
| debug_diagram(bts->bts, tbf->diag, "+-----------------+"); |
| |
| return tbf; |
| } |
| |
| static void tbf_timer_cb(void *_tbf) |
| { |
| struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
| tbf->handle_timeout(); |
| } |
| |
| void gprs_rlcmac_tbf::handle_timeout() |
| { |
| LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n", |
| (direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi, T); |
| |
| num_T_exp++; |
| |
| switch (T) { |
| #ifdef DEBUG_DL_ASS_IDLE |
| case 1234: |
| gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi); |
| break; |
| #endif |
| case 0: /* assignment */ |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) { |
| if (state_is(GPRS_RLCMAC_ASSIGN)) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "Releasing due to " |
| "PACCH assignment timeout.\n"); |
| tbf_free(this); |
| } else |
| LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not " |
| "in assign state\n"); |
| } |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { |
| /* change state to FLOW, so scheduler will start transmission */ |
| dir.dl.wait_confirm = 0; |
| if (state_is(GPRS_RLCMAC_ASSIGN)) { |
| tbf_new_state(this, GPRS_RLCMAC_FLOW); |
| tbf_assign_control_ts(this); |
| } else |
| LOGP(DRLCMAC, LOGL_NOTICE, "Continue flow after " |
| "IMM.ASS confirm\n"); |
| } |
| break; |
| case 3169: |
| case 3191: |
| case 3195: |
| LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during " |
| "transsmission\n", T); |
| rlcmac_diag(); |
| /* fall through */ |
| case 3193: |
| if (T == 3193) |
| debug_diagram(bts, diag, "T3193 timeout"); |
| LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); |
| /* free TBF */ |
| tbf_free(this); |
| break; |
| default: |
| LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n", T); |
| } |
| } |
| |
| int gprs_rlcmac_tbf::rlcmac_diag() |
| { |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n"); |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n"); |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA))) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n"); |
| else if (direction == GPRS_RLCMAC_UL_TBF) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n"); |
| if ((state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n"); |
| else if (direction == GPRS_RLCMAC_DL_TBF) |
| LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n"); |
| |
| return 0; |
| } |
| |
| struct msgb *gprs_rlcmac_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| { |
| struct msgb *msg; |
| struct timeval *tv, tv_now; |
| uint32_t octets = 0, frames = 0; |
| |
| gettimeofday(&tv_now, NULL); |
| |
| while ((msg = msgb_dequeue(&llc_queue))) { |
| tv = (struct timeval *)msg->data; |
| msgb_pull(msg, sizeof(*tv)); |
| if (tv->tv_sec /* not infinite */ |
| && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
| LOGP(DRLCMACDL, LOGL_NOTICE, "Discarding LLC PDU of " |
| "DL TBF=%d, because lifetime limit reached\n", |
| tfi); |
| frames++; |
| octets += msg->len; |
| msgb_free(msg); |
| continue; |
| } |
| break; |
| } |
| |
| if (frames) { |
| if (frames > 0xff) |
| frames = 0xff; |
| if (octets > 0xffffff) |
| octets = 0xffffff; |
| bssgp_tx_llc_discarded(bctx, tlli, frames, octets); |
| } |
| |
| return msg; |
| } |
| |
| void gprs_rlcmac_tbf::update_llc_frame(struct msgb *msg) |
| { |
| /* TODO: bounds check */ |
| memcpy(llc_frame, msg->data, msg->len); |
| llc_length = msg->len; |
| } |
| |
| /* |
| * Store received block data in LLC message(s) and forward to SGSN |
| * if complete. |
| */ |
| int gprs_rlcmac_tbf::assemble_forward_llc(uint8_t *data, uint8_t len) |
| { |
| struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
| uint8_t e, m; |
| struct rlc_li_field *li; |
| uint8_t frame_offset[16], offset = 0, chunk; |
| int i, frames = 0; |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
| |
| data += 3; |
| len -= 3; |
| e = rh->e; /* if extended */ |
| m = 1; /* more frames, that means: the first frame */ |
| |
| /* Parse frame offsets from length indicator(s), if any. */ |
| while (1) { |
| if (frames == (int)sizeof(frame_offset)) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
| "block\n"); |
| return -EINVAL; |
| } |
| frame_offset[frames++] = offset; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
| "%d\n", frames, offset); |
| if (!len) |
| break; |
| /* M == 0 and E == 0 is not allowed in this version. */ |
| if (!m && !e) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d " |
| "ignored, because M='0' and E='0'.\n", |
| this->tfi); |
| return 0; |
| } |
| /* no more frames in this segment */ |
| if (e) { |
| break; |
| } |
| /* There is a new frame and an LI that delimits it. */ |
| if (m) { |
| li = (struct rlc_li_field *)data; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| li->li); |
| /* Special case: LI == 0 |
| * If the last segment would fit precisely into the |
| * rest of the RLC MAC block, there would be no way |
| * to delimit that this segment ends and is not |
| * continued in the next block. |
| * The special LI (0) is used to force the segment to |
| * extend into the next block, so it is delimited there. |
| * This LI must be skipped. Also it is the last LI. |
| */ |
| if (li->li == 0) { |
| data++; |
| len--; |
| m = 1; /* M is ignored, we know there is more */ |
| break; /* handle E as '1', so we break! */ |
| } |
| e = li->e; |
| m = li->m; |
| offset += li->li; |
| data++; |
| len--; |
| continue; |
| } |
| } |
| if (!m) { |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
| "data\n"); |
| } |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
| len); |
| /* TLLI */ |
| if (rh->ti) { |
| if (len < 4) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| "frame border\n"); |
| return -EINVAL; |
| } |
| data += 4; |
| len -= 4; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| "%d\n", len); |
| } |
| |
| /* PFI */ |
| if (rh->pi) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| "please disable in SYSTEM INFORMATION\n"); |
| if (len < 1) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| "frame border\n"); |
| return -EINVAL; |
| } |
| data++; |
| len--; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
| "%d\n", len); |
| } |
| |
| /* Now we have: |
| * - a list of frames offsets: frame_offset[] |
| * - number of frames: i |
| * - m == 0: Last frame carries spare data (end of TBF). |
| */ |
| |
| /* Check if last offset would exceed frame. */ |
| if (offset > len) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, " |
| "because LI delimits data that exceeds block size.\n", |
| this->tfi); |
| return -EINVAL; |
| } |
| |
| /* create LLC frames */ |
| for (i = 0; i < frames; i++) { |
| /* last frame ? */ |
| if (i == frames - 1) { |
| /* no more data in last frame */ |
| if (!m) |
| break; |
| /* data until end of frame */ |
| chunk = len - frame_offset[i]; |
| } else { |
| /* data until next frame */ |
| chunk = frame_offset[i + 1] - frame_offset[i]; |
| } |
| LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
| "frame at %d.\n", chunk, this->llc_index); |
| if (this->llc_index + chunk > LLC_MAX_LEN) { |
| LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
| "maximum size.\n"); |
| chunk = LLC_MAX_LEN - this->llc_index; |
| } |
| memcpy(this->llc_frame + this->llc_index, data + frame_offset[i], |
| chunk); |
| this->llc_index += chunk; |
| /* not last frame. */ |
| if (i != frames - 1) { |
| /* send frame to SGSN */ |
| LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
| "TBF=%d: len=%d\n", this->tfi, this->llc_index); |
| gprs_rlcmac_tx_ul_ud(this); |
| this->llc_index = 0; /* reset frame space */ |
| /* also check if CV==0, because the frame may fill up the |
| * block precisely, then it is also complete. normally the |
| * frame would be extended into the next block with a 0-length |
| * delimiter added to this block. */ |
| } else if (rh->cv == 0) { |
| /* send frame to SGSN */ |
| LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
| "TBF=%d that fits precisely in last block: " |
| "len=%d\n", this->tfi, this->llc_index); |
| gprs_rlcmac_tx_ul_ud(this); |
| this->llc_index = 0; /* reset frame space */ |
| } |
| } |
| |
| return 0; |
| } |
| |
| void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx) |
| { |
| for (uint8_t tfi = 0; tfi < 32; tfi++) { |
| struct gprs_rlcmac_tbf *tbf; |
| |
| tbf = trx->ul_tbf[tfi]; |
| if (tbf) |
| tbf_free(tbf); |
| tbf = trx->dl_tbf[tfi]; |
| if (tbf) |
| tbf_free(tbf); |
| } |
| } |
| |
| void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_pdch *pdch) |
| { |
| for (uint8_t tfi = 0; tfi < 32; tfi++) { |
| struct gprs_rlcmac_tbf *tbf; |
| |
| tbf = pdch->ul_tbf[tfi]; |
| if (tbf) |
| tbf_free(tbf); |
| tbf = pdch->dl_tbf[tfi]; |
| if (tbf) |
| tbf_free(tbf); |
| } |
| } |