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-rw-r--r--src/gprs_rlcmac.c1067
1 files changed, 1067 insertions, 0 deletions
diff --git a/src/gprs_rlcmac.c b/src/gprs_rlcmac.c
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+++ b/src/gprs_rlcmac.c
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+/* 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;
+}