1 files changed, 58 insertions, 0 deletions
diff --git a/src/tbf_dl_ass_fsm.h b/src/tbf_dl_ass_fsm.h
new file mode 100644
index 00000000..cb7be8d3
--- /dev/null
+++ b/src/tbf_dl_ass_fsm.h
@@ -0,0 +1,58 @@
+/* tbf_dl_ass_fsm.h
+ *
+ * Copyright (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * Author: Pau Espin Pedrol <pespin@sysmocom.de>
+ *
+ * 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.
+ */
+#pragma once
+
+#include <osmocom/core/fsm.h>
+#include <osmocom/core/tdef.h>
+
+#include <gprs_pcu.h>
+
+struct gprs_rlcmac_tbf;
+struct gprs_rlcmac_pdch;
+
+enum tbf_dl_ass_fsm_event {
+	TBF_DL_ASS_EV_SCHED_ASS, /* Tx Uplink Assignment is pending */
+	TBF_DL_ASS_EV_CREATE_RLCMAC_MSG, /* Scheduler wants to gen+Tx the Ass (rej): data=tbf_dl_ass_ev_create_rlcmac_msg_ctx */
+	TBF_DL_ASS_EV_RX_ASS_CTRL_ACK, /* Received CTRL ACK answering poll set on Pkt Dl Ass */
+	TBF_DL_ASS_EV_ASS_POLL_TIMEOUT, /* Pdch Ul Controller signals timeout for poll set on Pkt Dl Ass */
+};
+
+enum tbf_dl_ass_fsm_states {
+	TBF_DL_ASS_NONE = 0,
+	TBF_DL_ASS_SEND_ASS, /* send downlink assignment on next RTS */
+	TBF_DL_ASS_WAIT_ACK, /* wait for PACKET CONTROL ACK */
+};
+
+struct tbf_dl_ass_fsm_ctx {
+	struct osmo_fsm_inst *fi;
+	struct gprs_rlcmac_tbf* tbf; /* back pointer */
+};
+
+extern struct osmo_fsm tbf_dl_ass_fsm;
+
+
+/* passed as data in TBF_DL_ASS_EV_CREATE_RLCMAC_MSG */
+struct tbf_dl_ass_ev_create_rlcmac_msg_ctx {
+	const struct gprs_rlcmac_pdch *pdch; /* TS where the created DL ctrl block is to be sent */
+	uint32_t fn; /* FN where the created DL ctrl block is to be sent */
+	struct msgb *msg; /* to be filled by FSM during event processing */
+};
+
+
+struct msgb *tbf_dl_ass_create_rlcmac_msg(const struct gprs_rlcmac_tbf *tbf,
+					  const struct gprs_rlcmac_pdch *pdch,
+					  uint32_t fn);
+bool tbf_dl_ass_rts(const struct gprs_rlcmac_tbf *tbf, const struct gprs_rlcmac_pdch *pdch);