1/* SPDX-License-Identifier: GPL-2.0-only */
2/* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
3
4#ifndef _VNIC_CQ_H_
5#define _VNIC_CQ_H_
6
7#include "cq_desc.h"
8#include "vnic_dev.h"
9
10/* Completion queue control */
11struct vnic_cq_ctrl {
12	u64 ring_base;			/* 0x00 */
13	u32 ring_size;			/* 0x08 */
14	u32 pad0;
15	u32 flow_control_enable;	/* 0x10 */
16	u32 pad1;
17	u32 color_enable;		/* 0x18 */
18	u32 pad2;
19	u32 cq_head;			/* 0x20 */
20	u32 pad3;
21	u32 cq_tail;			/* 0x28 */
22	u32 pad4;
23	u32 cq_tail_color;		/* 0x30 */
24	u32 pad5;
25	u32 interrupt_enable;		/* 0x38 */
26	u32 pad6;
27	u32 cq_entry_enable;		/* 0x40 */
28	u32 pad7;
29	u32 cq_message_enable;		/* 0x48 */
30	u32 pad8;
31	u32 interrupt_offset;		/* 0x50 */
32	u32 pad9;
33	u64 cq_message_addr;		/* 0x58 */
34	u32 pad10;
35};
36
37struct vnic_cq {
38	unsigned int index;
39	struct vnic_dev *vdev;
40	struct vnic_cq_ctrl __iomem *ctrl;	/* memory-mapped */
41	struct vnic_dev_ring ring;
42	unsigned int to_clean;
43	unsigned int last_color;
44};
45
46static inline unsigned int svnic_cq_service(struct vnic_cq *cq,
47	unsigned int work_to_do,
48	int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
49	u8 type, u16 q_number, u16 completed_index, void *opaque),
50	void *opaque)
51{
52	struct cq_desc *cq_desc;
53	unsigned int work_done = 0;
54	u16 q_number, completed_index;
55	u8 type, color;
56
57	cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
58		cq->ring.desc_size * cq->to_clean);
59	cq_desc_dec(cq_desc, &type, &color,
60		&q_number, &completed_index);
61
62	while (color != cq->last_color) {
63
64		if ((*q_service)(cq->vdev, cq_desc, type,
65			q_number, completed_index, opaque))
66			break;
67
68		cq->to_clean++;
69		if (cq->to_clean == cq->ring.desc_count) {
70			cq->to_clean = 0;
71			cq->last_color = cq->last_color ? 0 : 1;
72		}
73
74		cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
75			cq->ring.desc_size * cq->to_clean);
76		cq_desc_dec(cq_desc, &type, &color,
77			&q_number, &completed_index);
78
79		work_done++;
80		if (work_done >= work_to_do)
81			break;
82	}
83
84	return work_done;
85}
86
87void svnic_cq_free(struct vnic_cq *cq);
88int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
89	unsigned int index, unsigned int desc_count, unsigned int desc_size);
90void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
91	unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
92	unsigned int cq_tail_color, unsigned int interrupt_enable,
93	unsigned int cq_entry_enable, unsigned int message_enable,
94	unsigned int interrupt_offset, u64 message_addr);
95void svnic_cq_clean(struct vnic_cq *cq);
96#endif /* _VNIC_CQ_H_ */
97