/* gprs_bssgp_pcu.h
 *
 * Copyright (C) 2012 Ivan Klyuchnikov
 * 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.
 */

#ifndef GPRS_BSSGP_PCU_H
#define GPRS_BSSGP_PCU_H

#ifdef __cplusplus
extern "C" {
#endif
#include <osmocom/core/talloc.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/signal.h>
#include <osmocom/core/application.h>
#include <osmocom/gprs/gprs_ns2.h>
#include <osmocom/gprs/gprs_bssgp.h>
#include <osmocom/gprs/gprs_bssgp_bss.h>
#include <osmocom/gprs/gprs_msgb.h>

struct bssgp_bvc_ctx *btsctx_alloc(uint16_t bvci, uint16_t nsei);

#include <gprs_debug.h>

#include <time.h>
#include <unistd.h>

#define QOS_PROFILE 4
#define BSSGP_HDR_LEN 53
#define NS_HDR_LEN 4
#define IE_LLC_PDU 14

enum sgsn_counter_id {
	SGSN_CTR_RX_PAGING_CS,
	SGSN_CTR_RX_PAGING_PS,
};

struct gprs_bssgp_pcu {
	struct bssgp_bvc_ctx *bctx;

	struct gprs_rlcmac_bts *bts;

	struct osmo_timer_list bvc_timer;

	struct rate_ctr_group *ctrs;

	/* state: is the NSVC unblocked? */
	int nsvc_unblocked;

	/* state: true if bvc signalling needs to be reseted or waiting for reset ack */
	int bvc_sig_reset;
	/* state: true if bvc ptp needs to be reseted or waiting for reset ack */
	int bvc_reset;
	/* state: true if bvc ptp is unblocked */
	int bvc_unblocked;

	/* Flow control */
	struct timespec queue_delay_sum;
	unsigned queue_delay_count;
	uint8_t fc_tag;
	unsigned queue_frames_sent;
	unsigned queue_bytes_recv;
	unsigned queue_frames_recv;

	/** callbacks below */

	/* The BSSGP has been unblocked */
	void (*on_unblock_ack)(struct gprs_bssgp_pcu *pcu);

	/* When BSSGP data arrives. The msgb is not only for reference */
	void (*on_dl_unit_data)(struct gprs_bssgp_pcu *pcu, struct msgb *msg,
				struct tlv_parsed *tp);
};

int gprs_gp_send_cb(void *ctx, struct msgb *msg);
int gprs_ns_prim_cb(struct osmo_prim_hdr *oph, void *ctx);
void gprs_bssgp_update_queue_delay(const struct timespec *tv_recv,
		const struct timespec *tv_now);
void gprs_bssgp_update_frames_sent();
void gprs_bssgp_update_bytes_received(unsigned bytes_recv, unsigned frames_recv);

struct gprs_bssgp_pcu *gprs_bssgp_init(
		struct gprs_rlcmac_bts *bts,
		uint16_t nsei, uint16_t bvci,
		uint16_t mcc, uint16_t mnc, bool mnc_3_digits,
		uint16_t lac, uint16_t rac, uint16_t cell_id);

int gprs_ns_update_config(struct gprs_rlcmac_bts *bts, uint16_t nsei,
		   const struct osmo_sockaddr *local,
		   const struct osmo_sockaddr *remote,
		   uint16_t *nsvci, uint16_t valid);

void gprs_bssgp_destroy(struct gprs_rlcmac_bts *bts);

#ifdef __cplusplus
}
#endif

#endif // GPRS_BSSGP_PCU_H