Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Open Menu / drivers / scsi / snic / vnic_cq.h
Loading...
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright 2014 Cisco 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 */
	u32 ring_size;			/* 0x08 */
	u32 pad0;
	u32 flow_control_enable;	/* 0x10 */
	u32 pad1;
	u32 color_enable;		/* 0x18 */
	u32 pad2;
	u32 cq_head;			/* 0x20 */
	u32 pad3;
	u32 cq_tail;			/* 0x28 */
	u32 pad4;
	u32 cq_tail_color;		/* 0x30 */
	u32 pad5;
	u32 interrupt_enable;		/* 0x38 */
	u32 pad6;
	u32 cq_entry_enable;		/* 0x40 */
	u32 pad7;
	u32 cq_message_enable;		/* 0x48 */
	u32 pad8;
	u32 interrupt_offset;		/* 0x50 */
	u32 pad9;
	u64 cq_message_addr;		/* 0x58 */
	u32 pad10;
};

struct vnic_cq {
	unsigned int index;
	struct vnic_dev *vdev;
	struct vnic_cq_ctrl __iomem *ctrl;	/* memory-mapped */
	struct vnic_dev_ring ring;
	unsigned int to_clean;
	unsigned int last_color;
};

static inline unsigned int svnic_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;
}

void svnic_cq_free(struct vnic_cq *cq);
int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
	unsigned int index, unsigned int desc_count, unsigned int desc_size);
void svnic_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 svnic_cq_clean(struct vnic_cq *cq);
#endif /* _VNIC_CQ_H_ */