/*
 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * Copyright (c) 2014, Cisco Systems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the
 * distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef _VNIC_RQ_H_
#define _VNIC_RQ_H_


#include "vnic_dev.h"
#include "vnic_cq.h"

/* Receive queue control */
struct vnic_rq_ctrl {
	u64 ring_base;			/* 0x00 */
	u32 ring_size;			/* 0x08 */
	u32 pad0;
	u32 posted_index;		/* 0x10 */
	u32 pad1;
	u32 cq_index;			/* 0x18 */
	u32 pad2;
	u32 enable;			/* 0x20 */
	u32 pad3;
	u32 running;			/* 0x28 */
	u32 pad4;
	u32 fetch_index;		/* 0x30 */
	u32 pad5;
	u32 error_interrupt_enable;	/* 0x38 */
	u32 pad6;
	u32 error_interrupt_offset;	/* 0x40 */
	u32 pad7;
	u32 error_status;		/* 0x48 */
	u32 pad8;
	u32 tcp_sn;			/* 0x50 */
	u32 pad9;
	u32 unused;			/* 0x58 */
	u32 pad10;
	u32 dca_select;			/* 0x60 */
	u32 pad11;
	u32 dca_value;			/* 0x68 */
	u32 pad12;
	u32 data_ring;			/* 0x70 */
	u32 pad13;
	u32 header_split;		/* 0x78 */
	u32 pad14;
};

struct vnic_rq {
	unsigned int index;
	unsigned int posted_index;
	struct vnic_dev *vdev;
	struct vnic_rq_ctrl __iomem *ctrl;	/* memory-mapped */
	struct vnic_dev_ring ring;
	struct rte_mbuf **mbuf_ring;		/* array of allocated mbufs */
	unsigned int mbuf_next_idx;		/* next mb to consume */
	void *os_buf_head;
	unsigned int pkts_outstanding;
	uint16_t rx_nb_hold;
	uint16_t rx_free_thresh;
	unsigned int socket_id;
	struct rte_mempool *mp;
	uint16_t rxst_idx;
	uint32_t tot_pkts;
	uint16_t data_queue_idx;
	uint8_t is_sop;
	uint8_t in_use;
	struct rte_mbuf *pkt_first_seg;
	struct rte_mbuf *pkt_last_seg;
	unsigned int max_mbufs_per_pkt;
};

static inline unsigned int vnic_rq_desc_avail(struct vnic_rq *rq)
{
	/* how many does SW own? */
	return rq->ring.desc_avail;
}

static inline unsigned int vnic_rq_desc_used(struct vnic_rq *rq)
{
	/* how many does HW own? */
	return rq->ring.desc_count - rq->ring.desc_avail - 1;
}



enum desc_return_options {
	VNIC_RQ_RETURN_DESC,
	VNIC_RQ_DEFER_RETURN_DESC,
};

static inline int vnic_rq_fill(struct vnic_rq *rq,
	int (*buf_fill)(struct vnic_rq *rq))
{
	int err;

	while (vnic_rq_desc_avail(rq) > 0) {

		err = (*buf_fill)(rq);
		if (err)
			return err;
	}

	return 0;
}

static inline int vnic_rq_fill_count(struct vnic_rq *rq,
	int (*buf_fill)(struct vnic_rq *rq), unsigned int count)
{
	int err;

	while ((vnic_rq_desc_avail(rq) > 0) && (count--)) {

		err = (*buf_fill)(rq);
		if (err)
			return err;
	}

	return 0;
}

void vnic_rq_free(struct vnic_rq *rq);
int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
	unsigned int desc_count, unsigned int desc_size);
void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
	unsigned int fetch_index, unsigned int posted_index,
	unsigned int error_interrupt_enable,
	unsigned int error_interrupt_offset);
void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
	unsigned int error_interrupt_enable,
	unsigned int error_interrupt_offset);
void vnic_rq_error_out(struct vnic_rq *rq, unsigned int error);
unsigned int vnic_rq_error_status(struct vnic_rq *rq);
void vnic_rq_enable(struct vnic_rq *rq);
int vnic_rq_disable(struct vnic_rq *rq);
void vnic_rq_clean(struct vnic_rq *rq,
	void (*buf_clean)(struct rte_mbuf **buf));
#endif /* _VNIC_RQ_H_ */