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(desc_arg: cq_desc, type: &type, color: &color,
60 q_number: &q_number, completed_index: &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(desc_arg: cq_desc, type: &type, color: &color,
77 q_number: &q_number, completed_index: &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

source code of linux/drivers/scsi/snic/vnic_cq.h