| /* PDCH scheduler |
| * |
| * 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. |
| */ |
| |
| #include <gprs_bssgp_pcu.h> |
| #include <gprs_rlcmac.h> |
| #include <pcu_l1_if.h> |
| #include <bts.h> |
| #include <tbf.h> |
| #include <tbf_ul.h> |
| #include <gprs_debug.h> |
| #include <gprs_ms.h> |
| #include <rlc.h> |
| #include <sba.h> |
| #include <pdch.h> |
| #include "pcu_utils.h" |
| |
| extern "C" { |
| #include <osmocom/core/gsmtap.h> |
| } |
| |
| struct tbf_sched_candidates { |
| struct gprs_rlcmac_tbf *ul_ass; |
| struct gprs_rlcmac_tbf *dl_ass; |
| struct gprs_rlcmac_tbf *nacc; |
| struct gprs_rlcmac_ul_tbf *ul_ack; |
| }; |
| |
| static void get_ctrl_msg_tbf_candidates(const struct gprs_rlcmac_pdch *pdch, |
| struct tbf_sched_candidates *tbf_cand) |
| { |
| struct gprs_rlcmac_ul_tbf *ul_tbf; |
| struct gprs_rlcmac_dl_tbf *dl_tbf; |
| struct llist_item *pos; |
| |
| llist_for_each_entry(pos, &pdch->trx->ul_tbfs, list) { |
| ul_tbf = tbf_as_ul_tbf((struct gprs_rlcmac_tbf *)pos->entry); |
| OSMO_ASSERT(ul_tbf); |
| /* this trx, this ts */ |
| if (!ul_tbf->is_control_ts(pdch->ts_no)) |
| continue; |
| if (tbf_ul_ack_rts(ul_tbf)) |
| tbf_cand->ul_ack = ul_tbf; |
| if (tbf_dl_ass_rts(ul_tbf)) |
| tbf_cand->dl_ass = ul_tbf; |
| if (tbf_ul_ass_rts(ul_tbf)) |
| tbf_cand->ul_ass = ul_tbf; |
| /* NACC ready to send. TFI assigned is needed to send messages */ |
| if (ul_tbf->is_tfi_assigned() && ms_nacc_rts(ul_tbf->ms())) |
| tbf_cand->nacc = ul_tbf; |
| /* FIXME: Is this supposed to be fair? The last TBF for each wins? Maybe use llist_add_tail and skip once we have all |
| states? */ |
| } |
| llist_for_each_entry(pos, &pdch->trx->dl_tbfs, list) { |
| dl_tbf = tbf_as_dl_tbf((struct gprs_rlcmac_tbf *)pos->entry); |
| OSMO_ASSERT(dl_tbf); |
| /* this trx, this ts */ |
| if (!dl_tbf->is_control_ts(pdch->ts_no)) |
| continue; |
| if (tbf_dl_ass_rts(dl_tbf)) |
| tbf_cand->dl_ass = dl_tbf; |
| if (tbf_ul_ass_rts(dl_tbf)) |
| tbf_cand->ul_ass = dl_tbf; |
| /* NACC ready to send. TFI assigned is needed to send messages */ |
| if (dl_tbf->is_tfi_assigned() && ms_nacc_rts(dl_tbf->ms())) |
| tbf_cand->nacc = dl_tbf; |
| } |
| } |
| |
| static struct gprs_rlcmac_ul_tbf *sched_select_uplink(struct gprs_rlcmac_pdch *pdch, bool require_gprs_only) |
| { |
| struct gprs_rlcmac_ul_tbf *tbf; |
| uint8_t i, tfi; |
| |
| /* select uplink resource */ |
| for (i = 0, tfi = pdch->next_ul_tfi; i < 32; |
| i++, tfi = (tfi + 1) & 31) { |
| tbf = pdch->ul_tbf_by_tfi(tfi); |
| /* no TBF for this tfi, go next */ |
| if (!tbf) |
| continue; |
| /* no UL resources needed, go next */ |
| /* we don't need to give resources in FINISHED state, |
| * because we have received all blocks and only poll |
| * for packet control ack. */ |
| if (tbf->state_is_not(TBF_ST_FLOW)) |
| continue; |
| |
| if (require_gprs_only && tbf->is_egprs_enabled()) |
| continue; |
| |
| /* use this USF (tbf) */ |
| /* next TBF to handle resource is the next one */ |
| pdch->next_ul_tfi = (tfi + 1) & 31; |
| return tbf; |
| } |
| |
| return NULL; |
| } |
| |
| struct msgb *sched_app_info(struct gprs_rlcmac_tbf *tbf) { |
| struct gprs_rlcmac_bts *bts; |
| struct msgb *msg = NULL; |
| |
| if (!tbf || !tbf->ms()->app_info_pending) |
| return NULL; |
| |
| bts = tbf->bts; |
| |
| if (bts->app_info) { |
| LOGP(DRLCMACSCHED, LOGL_DEBUG, "Sending Packet Application Information message\n"); |
| msg = msgb_copy(bts->app_info, "app_info_msg_sched"); |
| } else |
| LOGP(DRLCMACSCHED, LOGL_ERROR, "MS has app_info_pending flag set, but no Packet Application Information" |
| " message stored in BTS!\n"); |
| |
| tbf->ms()->app_info_pending = false; |
| bts->app_info_pending--; |
| |
| if (!bts->app_info_pending) { |
| LOGP(DRLCMACSCHED, LOGL_DEBUG, "Packet Application Information successfully sent to all MS with active" |
| " TBF\n"); |
| msgb_free(bts->app_info); |
| bts->app_info = NULL; |
| } |
| return msg; |
| } |
| |
| static struct msgb *sched_select_ctrl_msg(struct gprs_rlcmac_pdch *pdch, uint32_t fn, |
| uint8_t block_nr, struct tbf_sched_candidates *tbfs) |
| { |
| struct msgb *msg = NULL; |
| struct gprs_rlcmac_tbf *tbf = NULL; |
| struct gprs_rlcmac_tbf *next_list[] = { tbfs->ul_ass, |
| tbfs->dl_ass, |
| tbfs->ul_ack, |
| tbfs->nacc }; |
| uint8_t ts = pdch->ts_no; |
| |
| /* Send Packet Application Information first (ETWS primary notifications) */ |
| msg = sched_app_info(tbfs->dl_ass); |
| |
| if (!msg) { |
| for (size_t i = 0; i < ARRAY_SIZE(next_list); ++i) { |
| tbf = next_list[(pdch->next_ctrl_prio + i) % ARRAY_SIZE(next_list)]; |
| if (!tbf) |
| continue; |
| |
| /* |
| * Assignments for the same direction have lower precedence, |
| * because they may kill the TBF when the CONTROL ACK is |
| * received, thus preventing the others from being processed. |
| */ |
| if (tbf == tbfs->ul_ass && tbf->ul_ass_state_is(TBF_UL_ASS_SEND_ASS_REJ)) |
| msg = tbf_ul_ass_create_rlcmac_msg(tbfs->ul_ass, fn, ts); |
| else if (tbf == tbfs->ul_ass && tbf->direction == GPRS_RLCMAC_DL_TBF) |
| msg = tbf_ul_ass_create_rlcmac_msg(tbfs->ul_ass, fn, ts); |
| else if (tbf == tbfs->dl_ass && tbf->direction == GPRS_RLCMAC_UL_TBF) |
| msg = tbf_dl_ass_create_rlcmac_msg(tbfs->dl_ass, fn, ts); |
| else if (tbf == tbfs->ul_ack) |
| msg = tbf_ul_ack_create_rlcmac_msg(tbfs->ul_ack, fn, ts); |
| else if (tbf == tbfs->nacc) { |
| msg = ms_nacc_create_rlcmac_msg(tbf->ms(), tbf, fn, ts); |
| } |
| |
| if (!msg) { |
| tbf = NULL; |
| continue; |
| } |
| |
| pdch->next_ctrl_prio = (pdch->next_ctrl_prio + 1) % ARRAY_SIZE(next_list); |
| break; |
| } |
| } |
| |
| if (!msg) { |
| /* |
| * If one of these is left, the response (CONTROL ACK) from the |
| * MS will kill the current TBF, only one of them can be |
| * non-NULL |
| */ |
| if (tbfs->dl_ass) { |
| tbf = tbfs->dl_ass; |
| msg = tbf_dl_ass_create_rlcmac_msg(tbfs->dl_ass, fn, ts); |
| } else if (tbfs->ul_ass) { |
| tbf = tbfs->ul_ass; |
| msg = tbf_ul_ass_create_rlcmac_msg(tbfs->ul_ass, fn, ts); |
| } |
| } |
| |
| /* any message */ |
| if (msg) { |
| if (!tbf) { |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_ERROR, "FN=%" PRIu32 |
| " Control message to be scheduled, but no TBF\n", fn); |
| msgb_free(msg); |
| return NULL; |
| } |
| tbf->rotate_in_list(); |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_DEBUG, "FN=%" PRIu32 |
| " Scheduling control message at RTS for %s\n", |
| fn, tbf_name(tbf)); |
| rate_ctr_inc(rate_ctr_group_get_ctr(tbf->ms()->ctrs, MS_CTR_DL_CTRL_MSG_SCHED)); |
| return msg; |
| } |
| |
| /* schedule PACKET PAGING REQUEST, if any are pending */ |
| msg = pdch->packet_paging_request(); |
| if (msg) { |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_DEBUG, "FN=%" PRIu32 |
| " Scheduling paging request message at RTS\n", fn); |
| return msg; |
| } |
| |
| return NULL; |
| } |
| |
| static inline enum tbf_dl_prio tbf_compute_priority(const struct gprs_rlcmac_bts *bts, struct gprs_rlcmac_dl_tbf *tbf, |
| uint8_t ts, uint32_t fn, int age) |
| { |
| const gprs_rlc_dl_window *w = static_cast<gprs_rlc_dl_window *>(tbf->window()); |
| unsigned long msecs_t3190 = osmo_tdef_get(the_pcu->T_defs, 3190, OSMO_TDEF_MS, -1); |
| unsigned long dl_tbf_idle_msec = osmo_tdef_get(the_pcu->T_defs, -2031, OSMO_TDEF_MS, -1); |
| int age_thresh1 = msecs_to_frames(200); |
| int age_thresh2 = msecs_to_frames(OSMO_MIN(msecs_t3190/2, dl_tbf_idle_msec)); |
| |
| if (tbf->is_control_ts(ts) && tbf->need_poll_for_dl_ack_nack()) |
| return DL_PRIO_CONTROL; |
| |
| if (tbf->is_control_ts(ts) && age > age_thresh2 && age_thresh2 > 0) |
| return DL_PRIO_HIGH_AGE; |
| |
| if ((tbf->state_is(TBF_ST_FLOW) && tbf->have_data()) || w->resend_needed() >= 0) |
| return DL_PRIO_NEW_DATA; |
| |
| if (tbf->is_control_ts(ts) && age > age_thresh1 && tbf->keep_open(fn)) |
| return DL_PRIO_LOW_AGE; |
| |
| if (!w->window_empty()) |
| return DL_PRIO_SENT_DATA; |
| |
| return DL_PRIO_NONE; |
| } |
| |
| /* Check if next data block of a TBF can be encoded in GMSK [(M)CS1-4]. */ |
| static bool can_produce_gmsk_data_block_next(struct gprs_rlcmac_dl_tbf *tbf, enum tbf_dl_prio prio) |
| { |
| const gprs_rlc_dl_window *w; |
| |
| /* GPRS TBFs can always send GMSK */ |
| if (!tbf->is_egprs_enabled()) |
| return true; |
| |
| switch (prio) { |
| case DL_PRIO_CONTROL: |
| /* Control blocks are always CS-1 */ |
| return true; |
| case DL_PRIO_NEW_DATA: |
| /* We can send any new data (no block generated yet) using any |
| * MCS. However, we don't (yet) support resegmenting already |
| * sent blocks (NACKed blocks in this case) into lower MCS of |
| * the same family. See OS#4966 */ |
| w = static_cast<gprs_rlc_dl_window *>(tbf->window()); |
| return w->resend_needed() < 0; |
| default: |
| return false; |
| } |
| } |
| |
| static struct msgb *sched_select_dl_data_msg(struct gprs_rlcmac_bts *bts, struct gprs_rlcmac_pdch *pdch, |
| uint32_t fn, uint8_t block_nr, enum mcs_kind req_mcs_kind, |
| bool *is_egprs) |
| { |
| struct msgb *msg = NULL; |
| struct gprs_rlcmac_dl_tbf *tbf, *prio_tbf = NULL; |
| enum tbf_dl_prio prio, max_prio = DL_PRIO_NONE; |
| uint8_t ts = pdch->ts_no; |
| |
| uint8_t i, tfi, prio_tfi; |
| int age; |
| |
| /* select downlink resource */ |
| for (i = 0, tfi = pdch->next_dl_tfi; i < 32; |
| i++, tfi = (tfi + 1) & 31) { |
| tbf = pdch->dl_tbf_by_tfi(tfi); |
| /* no TBF for this tfi, go next */ |
| if (!tbf) |
| continue; |
| /* no DL TBF, go next */ |
| if (tbf->direction != GPRS_RLCMAC_DL_TBF) |
| continue; |
| /* no DL resources needed, go next */ |
| if (tbf->state_is_not(TBF_ST_FLOW) |
| && tbf->state_is_not(TBF_ST_FINISHED)) |
| continue; |
| |
| /* If a GPRS (CS1-4) Dl block is required, skip EGPRS(_GSMK) tbfs: */ |
| if (req_mcs_kind == GPRS && tbf->is_egprs_enabled()) |
| continue; |
| |
| age = tbf->frames_since_last_poll(fn); |
| |
| /* compute priority */ |
| prio = tbf_compute_priority(bts, tbf, ts, fn, age); |
| if (prio == DL_PRIO_NONE) |
| continue; |
| |
| /* If a GPRS (CS1-4/MCS1-4) Dl block is required, downgrade MCS |
| * below instead of skipping. However, downgrade can only be |
| * done on new data BSNs (not yet sent) and control blocks. */ |
| if (req_mcs_kind == EGPRS_GMSK && !can_produce_gmsk_data_block_next(tbf, prio)) { |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_DEBUG, "FN=%" PRIu32 |
| " Cannot downgrade EGPRS TBF with prio %d for %s\n", |
| fn, prio, tbf_name(tbf)); |
| continue; |
| } |
| |
| /* get the TBF with the highest priority */ |
| if (prio > max_prio) { |
| prio_tfi = tfi; |
| prio_tbf = tbf; |
| max_prio = prio; |
| } |
| } |
| |
| if (prio_tbf) { |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_DEBUG, "FN=%" PRIu32 |
| " Scheduling data message at RTS for DL TFI=%d prio=%d mcs_mode_restrict=%s\n", |
| fn, prio_tfi, max_prio, mode_name(req_mcs_kind)); |
| /* next TBF to handle resource is the next one */ |
| pdch->next_dl_tfi = (prio_tfi + 1) & 31; |
| /* generate DL data block */ |
| msg = prio_tbf->create_dl_acked_block(fn, ts, req_mcs_kind); |
| *is_egprs = prio_tbf->is_egprs_enabled(); |
| } |
| |
| return msg; |
| } |
| |
| static const uint8_t rlcmac_dl_idle[23] = { |
| 0x47, /* control without optional header octets, no polling, USF=111 */ |
| 0x94, /* dummy downlink control message, paging mode 00 */ |
| 0x2b, /* no persistance level, 7 bits spare pattern */ |
| 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, |
| 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b |
| }; |
| |
| static struct msgb *sched_dummy(void) |
| { |
| struct msgb *msg; |
| |
| msg = msgb_alloc(23, "rlcmac_dl_idle"); |
| if (!msg) |
| return NULL; |
| memcpy(msgb_put(msg, 23), rlcmac_dl_idle, 23); |
| |
| return msg; |
| } |
| |
| static inline void tap_n_acc(const struct msgb *msg, struct gprs_rlcmac_bts *bts, uint8_t trx, uint8_t ts, |
| uint32_t fn, enum pcu_gsmtap_category cat) |
| { |
| if (!msg) |
| return; |
| |
| switch(cat) { |
| case PCU_GSMTAP_C_DL_CTRL: |
| bts_do_rate_ctr_inc(bts, CTR_RLC_SENT_CONTROL); |
| bts_send_gsmtap(bts, PCU_GSMTAP_C_DL_CTRL, false, trx, ts, GSMTAP_CHANNEL_PACCH, fn, msg->data, |
| msg->len); |
| break; |
| case PCU_GSMTAP_C_DL_DATA_GPRS: |
| case PCU_GSMTAP_C_DL_DATA_EGPRS: |
| bts_do_rate_ctr_inc(bts, CTR_RLC_SENT); |
| bts_send_gsmtap(bts, cat, false, trx, ts, GSMTAP_CHANNEL_PDTCH, fn, msg->data, |
| msg->len); |
| break; |
| case PCU_GSMTAP_C_DL_DUMMY: |
| bts_do_rate_ctr_inc(bts, CTR_RLC_SENT_DUMMY); |
| bts_send_gsmtap(bts, PCU_GSMTAP_C_DL_DUMMY, false, trx, ts, GSMTAP_CHANNEL_PACCH, fn, msg->data, |
| msg->len); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts, |
| uint8_t trx, uint8_t ts, |
| uint32_t fn, uint8_t block_nr) |
| { |
| struct gprs_rlcmac_pdch *pdch; |
| struct tbf_sched_candidates tbf_cand = {0}; |
| struct gprs_rlcmac_tbf *poll_tbf; |
| struct gprs_rlcmac_ul_tbf *usf_tbf = NULL; |
| struct gprs_rlcmac_sba *sba; |
| uint8_t usf; |
| struct msgb *msg = NULL; |
| uint32_t poll_fn; |
| enum pcu_gsmtap_category gsmtap_cat = PCU_GSMTAP_C_DL_DUMMY; /* init: make gcc happy */ |
| bool tx_is_egprs = false; |
| bool require_gprs_only; |
| enum mcs_kind req_mcs_kind; /* Restrict CS/MCS if DL Data block is to be sent */ |
| |
| if (trx >= 8 || ts >= 8) |
| return -EINVAL; |
| pdch = &bts->trx[trx].pdch[ts]; |
| |
| if (!pdch->is_enabled()) { |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_INFO, "Received RTS on disabled TS\n"); |
| return -EIO; |
| } |
| |
| /* store last frame number of RTS */ |
| pdch->last_rts_fn = fn; |
| |
| /* require_gprs_only: Prioritize USF for GPRS-only MS here, |
| * since anyway we'll need to tx a Dl block with CS1-4 due to |
| * synchronization requirements. See 3GPP TS 03.64 version |
| * 8.12.0 |
| */ |
| require_gprs_only = (pdch->fn_without_cs14 == MS_RESYNC_NUM_FRAMES - 1); |
| if (require_gprs_only) { |
| LOGP(DRLCMACSCHED, LOGL_DEBUG, "TRX=%d TS=%d FN=%d " |
| "synchronization frame (every 18 frames), only CS1-4 allowed", |
| trx, ts, fn); |
| req_mcs_kind = GPRS; /* only GPRS CS1-4 allowed, all MS need to be able to decode it */ |
| } else { |
| req_mcs_kind = EGPRS; /* all kinds are fine */ |
| } |
| |
| /* polling for next uplink block */ |
| poll_fn = rts_next_fn(fn, block_nr); |
| /* check for sba */ |
| if ((sba = pdch_ulc_get_sba(pdch->ulc, poll_fn))) { |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: " |
| "FN=%d block_nr=%d scheduling free USF for " |
| "single block allocation at FN=%d\n", fn, block_nr, sba->fn); |
| /* else, check uplink resource for polling */ |
| } else if ((poll_tbf = pdch_ulc_get_tbf_poll(pdch->ulc, poll_fn))) { |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: FN=%d " |
| "block_nr=%d scheduling free USF for polling at FN=%d of %s\n", |
| fn, block_nr, poll_fn, tbf_name(poll_tbf)); |
| /* If POLL TBF is UL and already has a USF assigned on this TS, |
| * let's set its USF in the DL msg. This is not really needed, |
| * but it helps understand better the flow when looking at |
| * pcaps. */ |
| if (poll_tbf->direction == GPRS_RLCMAC_UL_TBF && tbf_as_ul_tbf(poll_tbf)->m_usf[ts] != USF_INVALID) |
| usf_tbf = tbf_as_ul_tbf(poll_tbf); |
| /* else, search for uplink tbf */ |
| } else if ((usf_tbf = sched_select_uplink(pdch, require_gprs_only))) { |
| LOGPDCH(pdch, DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: FN=%d " |
| "block_nr=%d scheduling USF=%d for %s, expect answer on UL FN=%d\n", |
| fn, block_nr, usf_tbf->m_usf[pdch->ts_no], tbf_name(usf_tbf), poll_fn); |
| pdch_ulc_reserve_tbf_usf(pdch->ulc, poll_fn, usf_tbf); |
| } |
| /* If MS selected for USF is GPRS-only, then it will only be |
| * able to read USF if dl block uses GMSK (CS1-4, MCS1-4) */ |
| if (usf_tbf && req_mcs_kind == EGPRS && ms_mode(usf_tbf->ms()) != EGPRS) |
| req_mcs_kind = EGPRS_GMSK; |
| |
| get_ctrl_msg_tbf_candidates(pdch, &tbf_cand); |
| |
| /* Prio 1: select control message */ |
| if ((msg = sched_select_ctrl_msg(pdch, fn, block_nr, &tbf_cand))) { |
| gsmtap_cat = PCU_GSMTAP_C_DL_CTRL; |
| } |
| /* Prio 2: select data message for downlink */ |
| else if((msg = sched_select_dl_data_msg(bts, pdch, fn, block_nr, req_mcs_kind, &tx_is_egprs))) { |
| gsmtap_cat = tx_is_egprs ? PCU_GSMTAP_C_DL_DATA_EGPRS : |
| PCU_GSMTAP_C_DL_DATA_GPRS; |
| } |
| /* Prio 3: send dummy control message if need to poll or USF */ |
| else { |
| /* If there's no TBF attached to this PDCH, we can submit an empty |
| * data_req since there's nothing to transmit nor to poll/USF. This |
| * way we help BTS energy saving (on TRX!=C0) by sending nothing |
| * instead of a dummy block. The early return is done here and |
| * not at the start of the function because the condition below |
| * (num_tbfs==0) may not be enough, because temporary dummy TBFs |
| * created to send Imm Ass Rej (see handle_tbf_reject()) don't |
| * have a TFI assigned and hence are not attached to the PDCH |
| * TS, so they don't show up in the count below. |
| */ |
| const unsigned num_tbfs = pdch->num_tbfs(GPRS_RLCMAC_DL_TBF) |
| + pdch->num_tbfs(GPRS_RLCMAC_UL_TBF); |
| bool skip_idle = (num_tbfs == 0); |
| #ifdef ENABLE_DIRECT_PHY |
| /* In DIRECT_PHY mode we want to always submit something to L1 in |
| * TRX0, since BTS is not preparing dummy bursts on idle TS for us */ |
| skip_idle = skip_idle && trx != 0; |
| #endif |
| if (!skip_idle && (msg = sched_dummy())) { |
| /* increase counter */ |
| gsmtap_cat = PCU_GSMTAP_C_DL_DUMMY; |
| } else { |
| msg = NULL; /* submit empty frame */ |
| } |
| } |
| |
| if (tx_is_egprs && pdch->has_gprs_only_tbf_attached()) { |
| pdch->fn_without_cs14 += 1; |
| } else { |
| pdch->fn_without_cs14 = 0; |
| } |
| |
| /* Used to measure the leak rate, count all blocks */ |
| gprs_bssgp_update_frames_sent(); |
| |
| if (msg) { |
| /* msg is now available */ |
| bts_do_rate_ctr_add(bts, CTR_RLC_DL_BYTES, msgb_length(msg)); |
| |
| /* set USF */ |
| OSMO_ASSERT(msgb_length(msg) > 0); |
| usf = usf_tbf ? usf_tbf->m_usf[ts] : USF_UNUSED; |
| msg->data[0] = (msg->data[0] & 0xf8) | usf; |
| |
| /* Send to GSMTAP */ |
| tap_n_acc(msg, bts, trx, ts, fn, gsmtap_cat); |
| } |
| |
| /* send PDTCH/PACCH to L1. msg=NULL accepted too (idle block) */ |
| pcu_l1if_tx_pdtch(msg, bts, trx, ts, bts->trx[trx].arfcn, fn, block_nr); |
| |
| return 0; |
| } |