1068 lines
29 KiB
C
1068 lines
29 KiB
C
/* gprs_rlcmac.cpp
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <gprs_bssgp_pcu.h>
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#include <pcu_l1_if.h>
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#include <gprs_rlcmac.h>
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/* 3GPP TS 05.02 Annex B.1 */
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#define MS_NA 255 /* N/A */
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#define MS_A 254 /* 1 with hopping, 0 without */
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#define MS_B 253 /* 1 with hopping, 0 without (change Rx to Tx)*/
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#define MS_C 252 /* 1 with hopping, 0 without (change Tx to Rx)*/
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struct gprs_ms_multislot_class {
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uint8_t rx, tx, sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */
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uint8_t ta, tb, ra, rb; /* Minimum Number of Slots */
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uint8_t type; /* Type of Mobile */
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};
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struct gprs_ms_multislot_class gprs_ms_multislot_class[32] = {
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/* M-S Class Rx Tx Sum Tta Ttb Tra Trb Type */
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/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA },
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/* 1 */ { 1, 1, 2, 3, 2, 4, 2, 1 },
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/* 2 */ { 2, 1, 3, 3, 2, 3, 1, 1 },
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/* 3 */ { 2, 2, 3, 3, 2, 3, 1, 1 },
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/* 4 */ { 3, 1, 4, 3, 1, 3, 1, 1 },
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/* 5 */ { 2, 2, 4, 3, 1, 3, 1, 1 },
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/* 6 */ { 3, 2, 4, 3, 1, 3, 1, 1 },
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/* 7 */ { 3, 3, 4, 3, 1, 3, 1, 1 },
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/* 8 */ { 4, 1, 5, 3, 1, 2, 1, 1 },
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/* 9 */ { 3, 2, 5, 3, 1, 2, 1, 1 },
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/* 10 */ { 4, 2, 5, 3, 1, 2, 1, 1 },
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/* 11 */ { 4, 3, 5, 3, 1, 2, 1, 1 },
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/* 12 */ { 4, 4, 5, 2, 1, 2, 1, 1 },
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/* 13 */ { 3, 3, MS_NA, MS_NA, MS_A, 3, MS_A, 2 },
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/* 14 */ { 4, 4, MS_NA, MS_NA, MS_A, 3, MS_A, 2 },
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/* 15 */ { 5, 5, MS_NA, MS_NA, MS_A, 3, MS_A, 2 },
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/* 16 */ { 6, 6, MS_NA, MS_NA, MS_A, 2, MS_A, 2 },
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/* 17 */ { 7, 7, MS_NA, MS_NA, MS_A, 1, 0, 2 },
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/* 18 */ { 8, 8, MS_NA, MS_NA, 0, 0, 0, 2 },
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/* 19 */ { 6, 2, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 20 */ { 6, 3, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 21 */ { 6, 4, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 22 */ { 6, 4, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* 23 */ { 6, 6, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* 24 */ { 8, 2, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 25 */ { 8, 3, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 26 */ { 8, 4, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 27 */ { 8, 4, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* 28 */ { 8, 6, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* 29 */ { 8, 8, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA },
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/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA },
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};
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LLIST_HEAD(gprs_rlcmac_ul_tbfs);
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LLIST_HEAD(gprs_rlcmac_dl_tbfs);
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struct llist_head *gprs_rlcmac_tbfs_lists[] = {
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&gprs_rlcmac_ul_tbfs,
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&gprs_rlcmac_dl_tbfs,
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NULL
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};
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extern void *tall_pcu_ctx;
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/* FIXME: spread ressources over multiple TRX. Also add option to use same
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* TRX in case of existing TBF for TLLI in the other direction. */
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/* search for free TFI and return TFI, TRX and first TS */
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int tfi_alloc(enum gprs_rlcmac_tbf_direction dir, uint8_t *_trx, uint8_t *_ts,
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uint8_t use_trx, uint8_t first_ts)
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{
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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struct gprs_rlcmac_pdch *pdch;
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struct gprs_rlcmac_tbf **tbfp;
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uint8_t trx_from, trx_to, trx, ts, tfi;
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if (use_trx >= 0 && use_trx < 8)
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trx_from = trx_to = use_trx;
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else {
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trx_from = 0;
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trx_to = 7;
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}
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if (first_ts < 0 || first_ts >= 8)
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first_ts = 0;
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/* on TRX find first enabled TS */
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for (trx = trx_from; trx <= trx_to; trx++) {
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for (ts = first_ts; ts < 8; ts++) {
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pdch = &bts->trx[trx].pdch[ts];
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if (!pdch->enable)
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continue;
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break;
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}
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if (ts < 8)
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break;
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}
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if (trx > trx_to) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n");
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return -EINVAL;
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "Searching for first unallocated TFI: "
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"TRX=%d first TS=%d\n", trx, ts);
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if (dir == GPRS_RLCMAC_UL_TBF)
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tbfp = pdch->ul_tbf;
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else
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tbfp = pdch->dl_tbf;
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for (tfi = 0; tfi < 32; tfi++) {
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if (!tbfp[tfi])
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break;
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}
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if (tfi < 32) {
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LOGP(DRLCMAC, LOGL_DEBUG, " Found TFI=%d.\n", tfi);
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*_trx = trx;
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*_ts = ts;
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return tfi;
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}
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LOGP(DRLCMAC, LOGL_NOTICE, "No TFI available.\n");
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return -1;
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}
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static inline int8_t find_free_usf(struct gprs_rlcmac_pdch *pdch, uint8_t ts)
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{
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struct gprs_rlcmac_tbf *tbf;
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uint8_t usf_map = 0;
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uint8_t tfi, usf;
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/* make map of used USF */
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for (tfi = 0; tfi < 32; tfi++) {
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tbf = pdch->ul_tbf[tfi];
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if (!tbf)
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continue;
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usf_map |= (1 << tbf->dir.ul.usf[ts]);
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}
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/* look for USF, don't use USF=7 */
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for (usf = 0; usf < 7; usf++) {
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if (!(usf_map & (1 << usf)))
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return usf;
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}
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return -1;
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}
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/* lookup TBF Entity (by TFI) */
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struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi, uint8_t trx, uint8_t ts,
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enum gprs_rlcmac_tbf_direction dir)
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{
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struct gprs_rlcmac_tbf *tbf;
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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if (tfi >= 32 || trx >= 8 || ts >= 8)
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return NULL;
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if (dir == GPRS_RLCMAC_UL_TBF)
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tbf = bts->trx[trx].pdch[ts].ul_tbf[tfi];
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else
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tbf = bts->trx[trx].pdch[ts].dl_tbf[tfi];
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if (!tbf)
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return NULL;
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if (tbf->state != GPRS_RLCMAC_RELEASING)
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return tbf;
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return NULL;
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}
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/* search for active downlink or uplink tbf */
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struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli,
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enum gprs_rlcmac_tbf_direction dir)
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{
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struct gprs_rlcmac_tbf *tbf;
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if (dir == GPRS_RLCMAC_UL_TBF) {
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llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) {
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if (tbf->state != GPRS_RLCMAC_RELEASING
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&& tbf->tlli == tlli && tbf->tlli_valid)
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return tbf;
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}
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} else {
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llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) {
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if (tbf->state != GPRS_RLCMAC_RELEASING
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&& tbf->tlli == tlli)
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return tbf;
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}
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}
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return NULL;
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}
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struct gprs_rlcmac_tbf *tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
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{
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struct gprs_rlcmac_tbf *tbf;
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/* only one TBF can poll on specific TS/FN, because scheduler can only
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* schedule one downlink control block (with polling) at a FN per TS */
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llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) {
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if (tbf->state != GPRS_RLCMAC_RELEASING
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&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
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&& tbf->poll_fn == fn && tbf->trx == trx
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&& tbf->control_ts == ts)
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return tbf;
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}
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llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) {
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if (tbf->state != GPRS_RLCMAC_RELEASING
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&& tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
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&& tbf->poll_fn == fn && tbf->trx == trx
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&& tbf->control_ts == ts)
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return tbf;
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}
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return NULL;
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}
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struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_tbf *old_tbf,
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enum gprs_rlcmac_tbf_direction dir, uint8_t tfi, uint8_t trx,
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uint8_t first_ts, uint8_t ms_class, uint8_t single_slot)
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{
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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struct gprs_rlcmac_tbf *tbf;
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int rc;
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LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF starts here **********\n");
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LOGP(DRLCMAC, LOGL_INFO, "Allocating %s TBF: TFI=%d TRX=%d "
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"MS_CLASS=%d\n", (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL",
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tfi, trx, ms_class);
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if (trx >= 8 || first_ts >= 8 || tfi >= 32)
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return NULL;
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tbf = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_tbf);
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if (!tbf)
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return NULL;
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tbf->direction = dir;
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tbf->tfi = tfi;
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tbf->trx = trx;
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tbf->arfcn = bts->trx[trx].arfcn;
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tbf->first_ts = first_ts;
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tbf->ms_class = ms_class;
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tbf->ws = 64;
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tbf->sns = 128;
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/* select algorithm A in case we don't have multislot class info */
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if (single_slot || ms_class == 0)
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rc = alloc_algorithm_a(old_tbf, tbf,
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bts->alloc_algorithm_curst);
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else
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rc = bts->alloc_algorithm(old_tbf, tbf,
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bts->alloc_algorithm_curst);
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/* if no ressource */
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if (rc < 0) {
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talloc_free(tbf);
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return NULL;
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}
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/* assign control ts */
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tbf->control_ts = 0xff;
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rc = tbf_assign_control_ts(tbf);
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/* if no ressource */
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if (rc < 0) {
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talloc_free(tbf);
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return NULL;
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}
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/* set timestamp */
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gettimeofday(&tbf->bw_tv, NULL);
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INIT_LLIST_HEAD(&tbf->llc_queue);
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if (dir == GPRS_RLCMAC_UL_TBF)
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llist_add(&tbf->list, &gprs_rlcmac_ul_tbfs);
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else
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llist_add(&tbf->list, &gprs_rlcmac_dl_tbfs);
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return tbf;
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}
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/* Slot Allocation: Algorithm A
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*
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* Assign single slot for uplink and downlink
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*/
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int alloc_algorithm_a(struct gprs_rlcmac_tbf *old_tbf,
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struct gprs_rlcmac_tbf *tbf, uint32_t cust)
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{
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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struct gprs_rlcmac_pdch *pdch;
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uint8_t ts = tbf->first_ts;
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int8_t usf; /* must be signed */
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LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm A) for class "
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"%d\n", tbf->ms_class);
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pdch = &bts->trx[tbf->trx].pdch[ts];
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if (!pdch->enable) {
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LOGP(DRLCMAC, LOGL_ERROR, "TS=%d not enabled.", ts);
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return -EIO;
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}
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tbf->tsc = pdch->tsc;
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if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
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/* if TFI is free on TS */
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if (!pdch->ul_tbf[tbf->tfi]) {
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/* if USF available */
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usf = find_free_usf(pdch, ts);
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if (usf >= 0) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Assign uplink "
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"TS=%d USF=%d\n", ts, usf);
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pdch->ul_tbf[tbf->tfi] = tbf;
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tbf->pdch[ts] = pdch;
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} else {
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LOGP(DRLCMAC, LOGL_NOTICE, "- Failed "
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"allocating TS=%d, no USF available\n",
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ts);
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return -EBUSY;
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}
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} else {
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LOGP(DRLCMAC, LOGL_NOTICE, "- Failed allocating "
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"TS=%d, TFI is not available\n", ts);
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return -EBUSY;
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}
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} else {
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/* if TFI is free on TS */
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if (!pdch->dl_tbf[tbf->tfi]) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Assign downlink TS=%d\n",
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ts);
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pdch->dl_tbf[tbf->tfi] = tbf;
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tbf->pdch[ts] = pdch;
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} else {
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LOGP(DRLCMAC, LOGL_NOTICE, "- Failed allocating "
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"TS=%d, TFI is not available\n", ts);
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return -EBUSY;
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}
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}
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/* the only one TS is the common TS */
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tbf->first_common_ts = ts;
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return 0;
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}
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/* Slot Allocation: Algorithm B
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*
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* Assign as many downlink slots as possible.
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* Assign one uplink slot. (With free USF)
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*
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*/
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int alloc_algorithm_b(struct gprs_rlcmac_tbf *old_tbf,
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struct gprs_rlcmac_tbf *tbf, uint32_t cust)
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{
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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struct gprs_rlcmac_pdch *pdch;
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struct gprs_ms_multislot_class *ms_class;
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uint8_t Rx, Tx, Sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */
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uint8_t Tta, Ttb, Tra, Trb, Tt, Tr; /* Minimum Number of Slots */
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uint8_t Type; /* Type of Mobile */
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uint8_t rx_win_min, rx_win_max;
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uint8_t tx_win_min, tx_win_max, tx_range;
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uint8_t rx_window = 0, tx_window = 0;
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const char *digit[10] = { "0","1","2","3","4","5","6","7","8","9" };
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int8_t usf[8] = { -1, -1, -1, -1, -1, -1, -1, -1 }; /* must be signed */
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int8_t tsc = -1; /* must be signed */
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uint8_t i, ts;
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LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm B) for class "
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"%d\n", tbf->ms_class);
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if (tbf->ms_class >= 32) {
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LOGP(DRLCMAC, LOGL_ERROR, "Multislot class %d out of range.\n",
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tbf->ms_class);
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return -EINVAL;
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}
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ms_class = &gprs_ms_multislot_class[tbf->ms_class];
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if (ms_class->tx == MS_NA) {
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LOGP(DRLCMAC, LOGL_NOTICE, "Multislot class %d not "
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"applicable.\n", tbf->ms_class);
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return -EINVAL;
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}
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Rx = ms_class->rx;
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Tx = ms_class->tx;
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Sum = ms_class->sum;
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Tta = ms_class->ta;
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Ttb = ms_class->tb;
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Tra = ms_class->ra;
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Trb = ms_class->rb;
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Type = ms_class->type;
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/* Tta and Ttb may depend on hopping or frequency change */
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if (Ttb == MS_A) {
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if (/* FIXME: hopping*/ 0)
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Ttb = 1;
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else
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Ttb = 0;
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}
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if (Trb == MS_A) {
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if (/* FIXME: hopping*/ 0)
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Ttb = 1;
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else
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Ttb = 0;
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}
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if (Ttb == MS_B) {
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/* FIXME: or frequency change */
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if (/* FIXME: hopping*/ 0)
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Ttb = 1;
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else
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Ttb = 0;
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}
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if (Trb == MS_C) {
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/* FIXME: or frequency change */
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if (/* FIXME: hopping*/ 0)
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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;
|
|
}
|