1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
  4 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
  5 */
  6
  7#ifndef _VNIC_CQ_H_
  8#define _VNIC_CQ_H_
  9
 10#include "cq_desc.h"
 11#include "vnic_dev.h"
 12
 13/* Completion queue control */
 14struct vnic_cq_ctrl {
 15	u64 ring_base;			/* 0x00 */
 16	u32 ring_size;			/* 0x08 */
 17	u32 pad0;
 18	u32 flow_control_enable;	/* 0x10 */
 19	u32 pad1;
 20	u32 color_enable;		/* 0x18 */
 21	u32 pad2;
 22	u32 cq_head;			/* 0x20 */
 23	u32 pad3;
 24	u32 cq_tail;			/* 0x28 */
 25	u32 pad4;
 26	u32 cq_tail_color;		/* 0x30 */
 27	u32 pad5;
 28	u32 interrupt_enable;		/* 0x38 */
 29	u32 pad6;
 30	u32 cq_entry_enable;		/* 0x40 */
 31	u32 pad7;
 32	u32 cq_message_enable;		/* 0x48 */
 33	u32 pad8;
 34	u32 interrupt_offset;		/* 0x50 */
 35	u32 pad9;
 36	u64 cq_message_addr;		/* 0x58 */
 37	u32 pad10;
 38};
 39
 40struct vnic_rx_bytes_counter {
 41	unsigned int small_pkt_bytes_cnt;
 42	unsigned int large_pkt_bytes_cnt;
 43};
 44
 45struct vnic_cq {
 46	unsigned int index;
 47	struct vnic_dev *vdev;
 48	struct vnic_cq_ctrl __iomem *ctrl;              /* memory-mapped */
 49	struct vnic_dev_ring ring;
 50	unsigned int to_clean;
 51	unsigned int last_color;
 52	unsigned int interrupt_offset;
 53	struct vnic_rx_bytes_counter pkt_size_counter;
 54	unsigned int cur_rx_coal_timeval;
 55	unsigned int tobe_rx_coal_timeval;
 56	ktime_t prev_ts;
 57};
 58
 59static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
 60	unsigned int work_to_do,
 61	int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 62	u8 type, u16 q_number, u16 completed_index, void *opaque),
 63	void *opaque)
 64{
 65	struct cq_desc *cq_desc;
 66	unsigned int work_done = 0;
 67	u16 q_number, completed_index;
 68	u8 type, color;
 69
 70	cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
 71		cq->ring.desc_size * cq->to_clean);
 72	cq_desc_dec(cq_desc, &type, &color,
 73		&q_number, &completed_index);
 74
 75	while (color != cq->last_color) {
 76
 77		if ((*q_service)(cq->vdev, cq_desc, type,
 78			q_number, completed_index, opaque))
 79			break;
 80
 81		cq->to_clean++;
 82		if (cq->to_clean == cq->ring.desc_count) {
 83			cq->to_clean = 0;
 84			cq->last_color = cq->last_color ? 0 : 1;
 85		}
 86
 87		cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
 88			cq->ring.desc_size * cq->to_clean);
 89		cq_desc_dec(cq_desc, &type, &color,
 90			&q_number, &completed_index);
 91
 92		work_done++;
 93		if (work_done >= work_to_do)
 94			break;
 95	}
 96
 97	return work_done;
 98}
 99
100void vnic_cq_free(struct vnic_cq *cq);
101int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
102	unsigned int desc_count, unsigned int desc_size);
103void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
104	unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
105	unsigned int cq_tail_color, unsigned int interrupt_enable,
106	unsigned int cq_entry_enable, unsigned int message_enable,
107	unsigned int interrupt_offset, u64 message_addr);
108void vnic_cq_clean(struct vnic_cq *cq);
109
110#endif /* _VNIC_CQ_H_ */