aboutsummaryrefslogtreecommitdiffstats
path: root/src/sba.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/sba.cpp')
-rw-r--r--src/sba.cpp121
1 files changed, 121 insertions, 0 deletions
diff --git a/src/sba.cpp b/src/sba.cpp
new file mode 100644
index 0000000..f002649
--- /dev/null
+++ b/src/sba.cpp
@@ -0,0 +1,121 @@
+/* sba.cpp
+ *
+ * Copyright (C) 2012 Ivan Klyuchnikov
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
+ * Copyright (C) 2013 by Holger Hans Peter Freyther
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <gprs_rlcmac.h>
+#include <gprs_debug.h>
+#include <bts.h>
+
+extern "C" {
+#include <osmocom/core/talloc.h>
+}
+
+#include <errno.h>
+
+extern void *tall_pcu_ctx;
+
+/* starting time for assigning single slot
+ * This offset must be a multiple of 13. */
+#define AGCH_START_OFFSET 52
+
+LLIST_HEAD(gprs_rlcmac_sbas);
+
+int sba_alloc(struct gprs_rlcmac_bts *bts,
+ uint8_t *_trx, uint8_t *_ts, uint32_t *_fn, uint8_t ta)
+{
+
+ struct gprs_rlcmac_pdch *pdch;
+ struct gprs_rlcmac_sba *sba;
+ uint8_t trx, ts;
+ uint32_t fn;
+
+ sba = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_sba);
+ if (!sba)
+ return -ENOMEM;
+
+ for (trx = 0; trx < 8; trx++) {
+ for (ts = 0; ts < 8; ts++) {
+ pdch = &bts->trx[trx].pdch[ts];
+ if (!pdch->is_enabled())
+ continue;
+ break;
+ }
+ if (ts < 8)
+ break;
+ }
+ if (trx == 8) {
+ LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n");
+ talloc_free(sba);
+ return -EINVAL;
+ }
+
+ fn = (pdch->last_rts_fn + AGCH_START_OFFSET) % 2715648;
+
+ sba->trx = trx;
+ sba->ts = ts;
+ sba->fn = fn;
+ sba->ta = ta;
+
+ llist_add(&sba->list, &gprs_rlcmac_sbas);
+
+ *_trx = trx;
+ *_ts = ts;
+ *_fn = fn;
+ return 0;
+}
+
+struct gprs_rlcmac_sba *sba_find(uint8_t trx, uint8_t ts, uint32_t fn)
+{
+ struct gprs_rlcmac_sba *sba;
+
+ llist_for_each_entry(sba, &gprs_rlcmac_sbas, list) {
+ if (sba->trx == trx && sba->ts == ts && sba->fn == fn)
+ return sba;
+ }
+
+ return NULL;
+}
+
+uint32_t sched_sba(uint8_t trx, uint8_t ts, uint32_t fn, uint8_t block_nr)
+{
+ uint32_t sba_fn;
+ struct gprs_rlcmac_sba *sba;
+
+ /* check special TBF for events */
+ sba_fn = fn + 4;
+ if ((block_nr % 3) == 2)
+ sba_fn ++;
+ sba_fn = sba_fn % 2715648;
+ sba = sba_find(trx, ts, sba_fn);
+ if (sba)
+ return sba_fn;
+
+ return 0xffffffff;
+}
+
+int gprs_rlcmac_sba_timeout(struct gprs_rlcmac_sba *sba)
+{
+ LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for SBA\n");
+ llist_del(&sba->list);
+ talloc_free(sba);
+
+ return 0;
+}
+