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Diffstat (limited to 'src/gprs_rlcmac.c')
| -rw-r--r-- | src/gprs_rlcmac.c | 1067 |
1 files changed, 1067 insertions, 0 deletions
diff --git a/src/gprs_rlcmac.c b/src/gprs_rlcmac.c new file mode 100644 index 00000000..2bd6af89 --- /dev/null +++ b/src/gprs_rlcmac.c @@ -0,0 +1,1067 @@ +/* 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> + +/* 3GPP TS 05.02 Annex B.1 */ + +#define MS_NA 255 /* N/A */ +#define MS_A 254 /* 1 with hopping, 0 without */ +#define MS_B 253 /* 1 with hopping, 0 without (change Rx to Tx)*/ +#define MS_C 252 /* 1 with hopping, 0 without (change Tx to Rx)*/ + +struct gprs_ms_multislot_class { + uint8_t rx, tx, sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */ + uint8_t ta, tb, ra, rb; /* Minimum Number of Slots */ + uint8_t type; /* Type of Mobile */ +}; + +struct gprs_ms_multislot_class gprs_ms_multislot_class[32] = { +/* M-S Class Rx Tx Sum Tta Ttb Tra Trb Type */ +/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA }, +/* 1 */ { 1, 1, 2, 3, 2, 4, 2, 1 }, +/* 2 */ { 2, 1, 3, 3, 2, 3, 1, 1 }, +/* 3 */ { 2, 2, 3, 3, 2, 3, 1, 1 }, +/* 4 */ { 3, 1, 4, 3, 1, 3, 1, 1 }, +/* 5 */ { 2, 2, 4, 3, 1, 3, 1, 1 }, +/* 6 */ { 3, 2, 4, 3, 1, 3, 1, 1 }, +/* 7 */ { 3, 3, 4, 3, 1, 3, 1, 1 }, +/* 8 */ { 4, 1, 5, 3, 1, 2, 1, 1 }, +/* 9 */ { 3, 2, 5, 3, 1, 2, 1, 1 }, +/* 10 */ { 4, 2, 5, 3, 1, 2, 1, 1 }, +/* 11 */ { 4, 3, 5, 3, 1, 2, 1, 1 }, +/* 12 */ { 4, 4, 5, 2, 1, 2, 1, 1 }, +/* 13 */ { 3, 3, MS_NA, MS_NA, MS_A, 3, MS_A, 2 }, +/* 14 */ { 4, 4, MS_NA, MS_NA, MS_A, 3, MS_A, 2 }, +/* 15 */ { 5, 5, MS_NA, MS_NA, MS_A, 3, MS_A, 2 }, +/* 16 */ { 6, 6, MS_NA, MS_NA, MS_A, 2, MS_A, 2 }, +/* 17 */ { 7, 7, MS_NA, MS_NA, MS_A, 1, 0, 2 }, +/* 18 */ { 8, 8, MS_NA, MS_NA, 0, 0, 0, 2 }, +/* 19 */ { 6, 2, MS_NA, 3, MS_B, 2, MS_C, 1 }, +/* 20 */ { 6, 3, MS_NA, 3, MS_B, 2, MS_C, 1 }, +/* 21 */ { 6, 4, MS_NA, 3, MS_B, 2, MS_C, 1 }, +/* 22 */ { 6, 4, MS_NA, 2, MS_B, 2, MS_C, 1 }, +/* 23 */ { 6, 6, MS_NA, 2, MS_B, 2, MS_C, 1 }, +/* 24 */ { 8, 2, MS_NA, 3, MS_B, 2, MS_C, 1 }, +/* 25 */ { 8, 3, MS_NA, 3, MS_B, 2, MS_C, 1 }, +/* 26 */ { 8, 4, MS_NA, 3, MS_B, 2, MS_C, 1 }, +/* 27 */ { 8, 4, MS_NA, 2, MS_B, 2, MS_C, 1 }, +/* 28 */ { 8, 6, MS_NA, 2, MS_B, 2, MS_C, 1 }, +/* 29 */ { 8, 8, MS_NA, 2, MS_B, 2, MS_C, 1 }, +/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA }, +/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA }, +}; + +LLIST_HEAD(gprs_rlcmac_ul_tbfs); +LLIST_HEAD(gprs_rlcmac_dl_tbfs); +struct llist_head *gprs_rlcmac_tbfs_lists[] = { + &gprs_rlcmac_ul_tbfs, + &gprs_rlcmac_dl_tbfs, + NULL +}; +extern void *tall_pcu_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 && tbf->tlli_valid) + 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(tall_pcu_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; + } + + /* set timestamp */ + gettimeofday(&tbf->bw_tv, 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; +} + +/* Slot Allocation: Algorithm B + * + * Assign as many downlink slots as possible. + * Assign one uplink slot. (With free USF) + * + */ +int alloc_algorithm_b(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; + struct gprs_ms_multislot_class *ms_class; + uint8_t Rx, Tx, Sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */ + uint8_t Tta, Ttb, Tra, Trb, Tt, Tr; /* Minimum Number of Slots */ + uint8_t Type; /* Type of Mobile */ + uint8_t rx_win_min, rx_win_max; + uint8_t tx_win_min, tx_win_max, tx_range; + uint8_t rx_window = 0, tx_window = 0; + const char *digit[10] = { "0","1","2","3","4","5","6","7","8","9" }; + int8_t usf[8] = { -1, -1, -1, -1, -1, -1, -1, -1 }; /* must be signed */ + int8_t tsc = -1; /* must be signed */ + uint8_t i, ts; + + LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm B) for class " + "%d\n", tbf->ms_class); + + if (tbf->ms_class >= 32) { + LOGP(DRLCMAC, LOGL_ERROR, "Multislot class %d out of range.\n", + tbf->ms_class); + return -EINVAL; + } + + ms_class = &gprs_ms_multislot_class[tbf->ms_class]; + if (ms_class->tx == MS_NA) { + LOGP(DRLCMAC, LOGL_NOTICE, "Multislot class %d not " + "applicable.\n", tbf->ms_class); + return -EINVAL; + } + + Rx = ms_class->rx; + Tx = ms_class->tx; + Sum = ms_class->sum; + Tta = ms_class->ta; + Ttb = ms_class->tb; + Tra = ms_class->ra; + Trb = ms_class->rb; + Type = ms_class->type; + + /* Tta and Ttb may depend on hopping or frequency change */ + if (Ttb == MS_A) { + if (/* FIXME: hopping*/ 0) + Ttb = 1; + else + Ttb = 0; + } + if (Trb == MS_A) { + if (/* FIXME: hopping*/ 0) + Ttb = 1; + else + Ttb = 0; + } + if (Ttb == MS_B) { + /* FIXME: or frequency change */ + if (/* FIXME: hopping*/ 0) + Ttb = 1; + else + Ttb = 0; + } + if (Trb == MS_C) { + /* FIXME: or frequency change */ + if (/* FIXME: hopping*/ 0) + Ttb = 1; + else + Ttb = 0; + } + + LOGP(DRLCMAC, LOGL_DEBUG, "- Rx=%d Tx=%d Sum Rx+Tx=%s Tta=%s Ttb=%d " + " Tra=%d Trb=%d Type=%d\n", Rx, Tx, + (Sum == MS_NA) ? "N/A" : digit[Sum], + (Tta == MS_NA) ? "N/A" : digit[Tta], Ttb, Tra, Trb, Type); + + /* select the values for time contraints */ + if (/* FIXME: monitoring */0) { + /* applicable to type 1 and type 2 */ + Tt = Ttb; + Tr = Tra; + } else { + /* applicable to type 1 and type 2 */ + Tt = Ttb; + Tr = Trb; + } + + /* select a window of Rx slots if available + * The maximum allowed slots depend on RX or the window of available + * slots. + * This must be done for uplink TBF also, because it is the basis + * for calculating control slot and uplink slot(s). */ + rx_win_min = rx_win_max = tbf->first_ts; + for (ts = tbf->first_ts, i = 0; ts < 8; ts++) { + pdch = &bts->trx[tbf->trx].pdch[ts]; + /* check if enabled */ + if (!pdch->enable) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, because " + "not enabled\n", ts); + /* increase window for Type 1 */ + if (Type == 1) + i++; + continue; + } + /* check if TSC changes */ + if (tsc < 0) + tbf->tsc = tsc = pdch->tsc; + else if (tsc != pdch->tsc) { + LOGP(DRLCMAC, LOGL_ERROR, "Skipping TS %d of TRX=%d, " + "because it has different TSC than lower TS " + "of TRX. In order to allow multislot, all " + "slots must be configured with the same " + "TSC!\n", ts, tbf->trx); + /* increase window for Type 1 */ + if (Type == 1) + i++; + continue; + } + /* check if TFI for slot is available + * This is only possible for downlink TFI. */ + if (tbf->direction == GPRS_RLCMAC_DL_TBF + && pdch->dl_tbf[tbf->tfi]) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, because " + "already assigned to other DL TBF with " + "TFI=%d\n", ts, tbf->tfi); + /* increase window for Type 1 */ + if (Type == 1) + i++; + continue; + } + + rx_window |= (1 << ts); + LOGP(DRLCMAC, LOGL_DEBUG, "- Selected DL TS %d\n", ts); + + /* range of window (required for Type 1) */ + rx_win_max = ts; + + if (++i == Rx) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because slots / " + "window reached maximum alowed Rx size\n"); + break; + } + } + + LOGP(DRLCMAC, LOGL_DEBUG, "- Selected slots for RX: " + "(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n", + ((rx_window & 0x01)) ? 'D' : '.', + ((rx_window & 0x02)) ? 'D' : '.', + ((rx_window & 0x04)) ? 'D' : '.', + ((rx_window & 0x08)) ? 'D' : '.', + ((rx_window & 0x10)) ? 'D' : '.', + ((rx_window & 0x20)) ? 'D' : '.', + ((rx_window & 0x40)) ? 'D' : '.', + ((rx_window & 0x80)) ? 'D' : '.'); + + /* reduce window, if existing uplink slots collide RX window */ + if (Type == 1 && old_tbf && old_tbf->direction == GPRS_RLCMAC_UL_TBF) { + uint8_t collide = 0, ul_usage = 0; + int j; + + /* calculate mask of colliding slots */ + for (ts = old_tbf->first_ts; ts < 8; ts++) { + if (old_tbf->pdch[ts]) { + ul_usage |= (1 << ts); + /* mark bits from TS-t .. TS+r */ + for (j = ts - Tt; j != ((ts + Tr + 1) & 7); + j = (j + 1) & 7) + collide |= (1 << j); + } + } + LOGP(DRLCMAC, LOGL_DEBUG, "- Not allowed slots due to existing " + "UL allocation: (TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7) " + " D=downlink x=not usable\n", + ((ul_usage & 0x01)) ? 'D' : ((collide & 0x01))?'x':'.', + ((ul_usage & 0x02)) ? 'D' : ((collide & 0x02))?'x':'.', + ((ul_usage & 0x04)) ? 'D' : ((collide & 0x04))?'x':'.', + ((ul_usage & 0x08)) ? 'D' : ((collide & 0x08))?'x':'.', + ((ul_usage & 0x10)) ? 'D' : ((collide & 0x10))?'x':'.', + ((ul_usage & 0x20)) ? 'D' : ((collide & 0x20))?'x':'.', + ((ul_usage & 0x40)) ? 'D' : ((collide & 0x40))?'x':'.', + ((ul_usage & 0x80)) ? 'D' : ((collide & 0x80))?'x':'.'); + + /* apply massk to reduce tx_window (shifted by 3 slots) */ + rx_window &= ~(collide << 3); + rx_window &= ~(collide >> 5); + LOGP(DRLCMAC, LOGL_DEBUG, "- Remaining slots for RX: " + "(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n", + ((rx_window & 0x01)) ? 'D' : '.', + ((rx_window & 0x02)) ? 'D' : '.', + ((rx_window & 0x04)) ? 'D' : '.', + ((rx_window & 0x08)) ? 'D' : '.', + ((rx_window & 0x10)) ? 'D' : '.', + ((rx_window & 0x20)) ? 'D' : '.', + ((rx_window & 0x40)) ? 'D' : '.', + ((rx_window & 0x80)) ? 'D' : '.'); + if (!rx_window) { + LOGP(DRLCMAC, LOGL_NOTICE, "No suitable downlink slots " + "available with current uplink assignment\n"); + return -EBUSY; + } + + /* calculate new min/max */ + for (ts = rx_win_min; ts <= rx_win_max; ts++) { + if ((rx_window & (1 << ts))) + break; + rx_win_min = ts + 1; + LOGP(DRLCMAC, LOGL_DEBUG, "- TS has been deleted, so " + "raising start of DL window to %d\n", + rx_win_min); + } + for (ts = rx_win_max; ts >= rx_win_min; ts--) { + if ((rx_window & (1 << ts))) + break; + rx_win_max = ts - 1; + LOGP(DRLCMAC, LOGL_DEBUG, "- TS has been deleted, so " + "lowering end of DL window to %d\n", + rx_win_max); + } + } + + /* reduce window, to allow at least one uplink TX slot + * this is only required for Type 1 */ + if (Type == 1 && rx_win_max - rx_win_min + 1 + Tt + 1 + Tr > 8) { + rx_win_max = rx_win_min + 7 - Tr - 1 - Tr; + LOGP(DRLCMAC, LOGL_DEBUG, "- Reduce RX window due to time " + "contraints to %d slots\n", + rx_win_max - rx_win_min + 1); + } + + LOGP(DRLCMAC, LOGL_DEBUG, "- RX-Window is: %d..%d\n", rx_win_min, + rx_win_max); + + /* calculate TX window */ + if (Type == 1) { + /* calculate TX window (shifted by 3 timeslots) + * it uses the space between tx_win_max and tx_win_min */ + tx_win_min = (rx_win_max - 2 + Tt) & 7; + tx_win_max = (rx_win_min + 4 - Tr) & 7; + /* calculate the TX window size (might be larger than Tx) */ + tx_range = (tx_win_max - tx_win_min + 1) & 7; + } else { + /* TX and RX simultaniously */ + tx_win_min = rx_win_min; + tx_win_max = 7; + /* TX window size (might be larger than Tx) */ + tx_range = tx_win_max - tx_win_min + 1; + } + + LOGP(DRLCMAC, LOGL_DEBUG, "- TX-Window is: %d..%d\n", tx_win_min, + tx_win_max); + + /* select a window of Tx slots if available + * The maximum allowed slots depend on TX or the window of available + * slots. */ + if (tbf->direction == GPRS_RLCMAC_UL_TBF) { + for (ts = tx_win_min, i = 0; i < tx_range; ts = (ts + 1) & 7) { + pdch = &bts->trx[tbf->trx].pdch[ts]; + /* check if enabled */ + if (!pdch->enable) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, " + "because not enabled\n", ts); + continue; + } + /* check if TSC changes */ + if (tsc < 0) + tbf->tsc = tsc = pdch->tsc; + else if (tsc != pdch->tsc) { + LOGP(DRLCMAC, LOGL_ERROR, "Skipping TS %d of " + "TRX=%d, because it has different TSC " + "than lower TS of TRX. In order to " + "allow multislot, all slots must be " + "configured with the same TSC!\n", + ts, tbf->trx); + /* increase window for Type 1 */ + if (Type == 1) + i++; + continue; + } + /* check if TFI for slot is available */ + if (pdch->ul_tbf[tbf->tfi]) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, " + "because already assigned to other " + "UL TBF with TFI=%d\n", ts, tbf->tfi); + /* increase window for Type 1 */ + if (Type == 1) + i++; + continue; + } + /* check for free usf */ + usf[ts] = find_free_usf(pdch, ts); + if (usf[ts] < 0) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, " + "because no USF available\n", ts); + /* increase window for Type 1 */ + if (Type == 1) + i++; + continue; + } + + tx_window |= (1 << ts); + LOGP(DRLCMAC, LOGL_DEBUG, "- Selected UL TS %d\n", ts); + + if (!(cust & 1)) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because " + "1 slot assigned\n"); + break; + } + if (++i == Tx) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because " + "slots / window reached maximum alowed " + "Tx size\n"); + break; + } + } + + LOGP(DRLCMAC, LOGL_DEBUG, "- Selected TX window: " + "(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n", + ((tx_window & 0x01)) ? 'U' : '.', + ((tx_window & 0x02)) ? 'U' : '.', + ((tx_window & 0x04)) ? 'U' : '.', + ((tx_window & 0x08)) ? 'U' : '.', + ((tx_window & 0x10)) ? 'U' : '.', + ((tx_window & 0x20)) ? 'U' : '.', + ((tx_window & 0x40)) ? 'U' : '.', + ((tx_window & 0x80)) ? 'U' : '.'); + + if (!tx_window) { + LOGP(DRLCMAC, LOGL_NOTICE, "No suitable uplink slots " + "available\n"); + return -EBUSY; + } + } + + if (tbf->direction == GPRS_RLCMAC_DL_TBF) { + uint8_t slotcount = 0; + + /* assign downlink */ + if (rx_window == 0) { + LOGP(DRLCMAC, LOGL_NOTICE, "No downlink slots " + "available\n"); + return -EINVAL; + } + for (ts = 0; ts < 8; ts++) { + if ((rx_window & (1 << ts))) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning DL TS " + "%d\n", ts); + pdch = &bts->trx[tbf->trx].pdch[ts]; + pdch->dl_tbf[tbf->tfi] = tbf; + tbf->pdch[ts] = pdch; + slotcount++; + } + } + if (slotcount) + LOGP(DRLCMAC, LOGL_INFO, "Using Multislot with %d " + "slots DL\n", slotcount); + } else { + /* assign uplink */ + if (tx_window == 0) { + LOGP(DRLCMAC, LOGL_NOTICE, "No uplink slots " + "available\n"); + return -EINVAL; + } + for (ts = 0; ts < 8; ts++) { + if ((tx_window & (1 << ts))) { + LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning UL TS " + "%d\n", ts); + pdch = &bts->trx[tbf->trx].pdch[ts]; + pdch->ul_tbf[tbf->tfi] = tbf; + tbf->pdch[ts] = pdch; + tbf->dir.ul.usf[ts] = usf[ts]; + } + } + } + + /* the timeslot of the TX window start is always + * available in RX window */ + tbf->first_common_ts = tx_win_min; + + 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; + } + + 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->first_common_ts); + else if (tbf->control_ts != tbf->first_common_ts) + LOGP(DRLCMAC, LOGL_DEBUG, "- Changing Control TS %d\n", + tbf->first_common_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; + 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: + rc = gprs_rlcmac_rcv_control_block(trx, ts, fn, data, len); + 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; +} + +/* add paging to paging queue(s) */ +int gprs_rlcmac_add_paging(uint8_t chan_needed, uint8_t *identity_lv) +{ + struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; + uint8_t l, trx, ts, any_tbf = 0; + struct gprs_rlcmac_tbf *tbf; + struct gprs_rlcmac_paging *pag; + uint8_t slot_mask[8]; + int8_t first_ts; /* must be signed */ + + LOGP(DRLCMAC, LOGL_INFO, "Add RR paging: chan-needed=%d MI=%s\n", + chan_needed, osmo_hexdump(identity_lv + 1, identity_lv[0])); + + /* collect slots to page + * Mark slots for every TBF, but only mark one of it. + * Mark only the first slot found. + * Don't mark, if TBF uses a different slot that is already marked. */ + memset(slot_mask, 0, sizeof(slot_mask)); + for (l = 0; gprs_rlcmac_tbfs_lists[l]; l++) { + llist_for_each_entry(tbf, gprs_rlcmac_tbfs_lists[l], list) { + first_ts = -1; + for (ts = 0; ts < 8; ts++) { + if (tbf->pdch[ts]) { + /* remember the first slot found */ + if (first_ts < 0) + first_ts = ts; + /* break, if we already marked a slot */ + if ((slot_mask[tbf->trx] & (1 << ts))) + break; + } + } + /* mark first slot found, if none is marked already */ + if (ts == 8 && first_ts >= 0) { + LOGP(DRLCMAC, LOGL_DEBUG, "- %s TBF=%d uses " + "TRX=%d TS=%d, so we mark\n", + (tbf->direction == GPRS_RLCMAC_UL_TBF) + ? "UL" : "DL", + tbf->tfi, tbf->trx, first_ts); + slot_mask[tbf->trx] |= (1 << first_ts); + } else + LOGP(DRLCMAC, LOGL_DEBUG, "- %s TBF=%d uses " + "already marked TRX=%d TS=%d\n", + (tbf->direction == GPRS_RLCMAC_UL_TBF) + ? "UL" : "DL", + tbf->tfi, tbf->trx, ts); + } + } + + /* Now we have a list of marked slots. Every TBF uses at least one + * of these slots. */ + + /* schedule paging to all marked slots */ + for (trx = 0; trx < 8; trx++) { + if (slot_mask[trx] == 0) + continue; + any_tbf = 1; + for (ts = 0; ts < 8; ts++) { + if ((slot_mask[trx] & (1 << ts))) { + /* schedule */ + pag = talloc_zero(tall_pcu_ctx, + struct gprs_rlcmac_paging); + if (!pag) + return -ENOMEM; + pag->chan_needed = chan_needed; + memcpy(pag->identity_lv, identity_lv, + identity_lv[0] + 1); + llist_add(&pag->list, + &bts->trx[trx].pdch[ts].paging_list); + LOGP(DRLCMAC, LOGL_INFO, "Paging on PACCH of " + "TRX=%d TS=%d\n", trx, ts); + } + } + } + + if (!any_tbf) + LOGP(DRLCMAC, LOGL_INFO, "No paging, because no TBF\n"); + + return 0; +} + +struct gprs_rlcmac_paging *gprs_rlcmac_dequeue_paging( + struct gprs_rlcmac_pdch *pdch) +{ + struct gprs_rlcmac_paging *pag; + + if (llist_empty(&pdch->paging_list)) + return NULL; + pag = llist_entry(pdch->paging_list.next, + struct gprs_rlcmac_paging, list); + llist_del(&pag->list); + + return pag; +} + +/* Send Uplink unit-data to SGSN. */ +int gprs_rlcmac_tx_ul_ud(struct 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; +} |