sba: Create a SBAController that will manage the sbas for a BTS

The PollController is a friend of the SBAController and is allowed
to access the internal list. The list is hidden from everyone else.

This is done because the calculation of timeout should belong into
the PollController and not into the SBAController.

1 files changed, 65 insertions, 0 deletions

diff --git a/src/sba.h b/src/sba.h
new file mode 100644
index 00000000..c25aa14f
--- /dev/null
+++ b/src/sba.h
@@ -0,0 +1,65 @@
+/*
+ *
+ * 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.
+ */
+#pragma once
+
+#include <stdint.h>
+
+extern "C" {
+#include <osmocom/core/linuxlist.h>
+}
+
+class BTS;
+class PollController;
+struct gprs_rlcmac_sba;
+
+/*
+ * single block allocation entry
+ */
+struct gprs_rlcmac_sba {
+	struct llist_head list;
+	uint8_t trx;
+	uint8_t ts;
+	uint32_t fn;
+	uint8_t ta;
+};
+
+/**
+ * I help to manage SingleBlockAssignment (SBA).
+ *
+ * TODO: Add a flush method..
+ */
+class SBAController {
+	friend class PollController;
+public:
+	SBAController(BTS &bts);
+
+	int alloc(uint8_t *_trx, uint8_t *_ts, uint32_t *_fn, uint8_t ta);
+	gprs_rlcmac_sba *find(uint8_t trx, uint8_t ts, uint32_t fn);
+
+	uint32_t sched(uint8_t trx, uint8_t ts, uint32_t fn, uint8_t block_nr);
+
+	int timeout(struct gprs_rlcmac_sba *sba);
+	void free_resources(uint8_t trx, uint8_t ts);
+
+private:
+	BTS &m_bts;
+	llist_head m_sbas;
+};