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 */
23 struct 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 
49 struct 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 
vnic_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)58 static 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(cq_desc, &type, &color,
72 		&q_number, &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(cq_desc, &type, &color,
89 			&q_number, &completed_index);
90 
91 		work_done++;
92 		if (work_done >= work_to_do)
93 			break;
94 	}
95 
96 	return work_done;
97 }
98 
99 void vnic_cq_free(struct vnic_cq *cq);
100 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
101 	unsigned int desc_count, unsigned int desc_size);
102 void 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);
107 void vnic_cq_clean(struct vnic_cq *cq);
108 
109 #endif /* _VNIC_CQ_H_ */
110