/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2008-2017 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 */

#ifndef _VNIC_CQ_H_
#define _VNIC_CQ_H_

#include "cq_desc.h"
#include "vnic_dev.h"

/* Completion queue control */
struct vnic_cq_ctrl {
	u64 ring_base;			/* 0x00 */
#define CQ_RING_BASE			   0x00
	u32 ring_size;			/* 0x08 */
#define CQ_RING_SIZE			   0x08
	u32 pad0;
	u32 flow_control_enable;	/* 0x10 */
#define CQ_FLOW_CONTROL_ENABLE		   0x10
	u32 pad1;
	u32 color_enable;		/* 0x18 */
#define CQ_COLOR_ENABLE			   0x18
	u32 pad2;
	u32 cq_head;			/* 0x20 */
#define CQ_HEAD				   0x20
	u32 pad3;
	u32 cq_tail;			/* 0x28 */
#define CQ_TAIL				   0x28
	u32 pad4;
	u32 cq_tail_color;		/* 0x30 */
#define CQ_TAIL_COLOR			   0x30
	u32 pad5;
	u32 interrupt_enable;		/* 0x38 */
#define CQ_INTR_ENABLE			   0x38
	u32 pad6;
	u32 cq_entry_enable;		/* 0x40 */
#define CQ_ENTRY_ENABLE			   0x40
	u32 pad7;
	u32 cq_message_enable;		/* 0x48 */
#define CQ_MESSAGE_ENABLE		   0x48
	u32 pad8;
	u32 interrupt_offset;		/* 0x50 */
#define CQ_INTR_OFFSET			   0x50
	u32 pad9;
	u64 cq_message_addr;		/* 0x58 */
#define CQ_MESSAGE_ADDR			   0x58
	u32 pad10;
};

#ifdef ENIC_AIC
struct vnic_rx_bytes_counter {
	unsigned int small_pkt_bytes_cnt;
	unsigned int large_pkt_bytes_cnt;
};
#endif

struct vnic_cq {
	unsigned int index;
	struct vnic_dev *vdev;
	struct vnic_res *ctrl;
	struct vnic_dev_ring ring;
	unsigned int to_clean;
	unsigned int last_color;
	unsigned int interrupt_offset;
#ifdef ENIC_AIC
	struct vnic_rx_bytes_counter pkt_size_counter;
	unsigned int cur_rx_coal_timeval;
	unsigned int tobe_rx_coal_timeval;
	ktime_t prev_ts;
#endif
	int ntxqsets;
	int nrxqsets;
	int ntxqsets_start;
	int nrxqsets_start;
};

void vnic_cq_free(struct vnic_cq *cq);
void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
    unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
    unsigned int cq_tail_color, unsigned int interrupt_enable,
    unsigned int cq_entry_enable, unsigned int message_enable,
    unsigned int interrupt_offset, u64 message_addr);
void vnic_cq_clean(struct vnic_cq *cq);
int vnic_cq_mem_size(struct vnic_cq *cq, unsigned int desc_count,
    unsigned int desc_size);

static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
    unsigned int work_to_do,
    int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
        u8 type, u16 q_number, u16 completed_index, void *opaque),
    void *opaque)
{
	struct cq_desc *cq_desc;
	unsigned int work_done = 0;
	u16 q_number, completed_index;
	u8 type, color;

	cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
	    cq->ring.desc_size * cq->to_clean);
	cq_desc_dec(cq_desc, &type, &color,
	    &q_number, &completed_index);

	while (color != cq->last_color) {
		if ((*q_service)(cq->vdev, cq_desc, type,
			q_number, completed_index, opaque))
			break;

		cq->to_clean++;
		if (cq->to_clean == cq->ring.desc_count) {
			cq->to_clean = 0;
			cq->last_color = cq->last_color ? 0 : 1;
		}

		cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
		    cq->ring.desc_size * cq->to_clean);
		cq_desc_dec(cq_desc, &type, &color,
		    &q_number, &completed_index);

		work_done++;
		if (work_done >= work_to_do)
			break;
	}

	return work_done;
}

static inline unsigned int vnic_cq_work(struct vnic_cq *cq,
    unsigned int work_to_do)
{
	struct cq_desc *cq_desc;
	unsigned int work_avail = 0;
	u16 q_number, completed_index;
	u8 type, color;
	u32 to_clean, last_color;

	to_clean = cq->to_clean;
	last_color = cq->last_color;
	cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
	    cq->ring.desc_size * to_clean);
	cq_desc_dec(cq_desc, &type, &color,
	    &q_number, &completed_index);

	while (color != last_color) {
		to_clean++;
		if (to_clean == cq->ring.desc_count) {
			to_clean = 0;
			last_color = last_color ? 0 : 1;
		}

		cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
		    cq->ring.desc_size * to_clean);
		cq_desc_dec(cq_desc, &type, &color,
		    &q_number, &completed_index);

		work_avail++;
		if (work_avail >= work_to_do)
			break;
	}

	return work_avail;
}

#endif /* _VNIC_CQ_H_ */