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

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