1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
5  */
6 
7 #ifndef _VNIC_CQ_H_
8 #define _VNIC_CQ_H_
9 
10 #include "cq_desc.h"
11 #include "vnic_dev.h"
12 
13 /* Completion queue control */
14 struct vnic_cq_ctrl {
15 	u64 ring_base;			/* 0x00 */
16 	u32 ring_size;			/* 0x08 */
17 	u32 pad0;
18 	u32 flow_control_enable;	/* 0x10 */
19 	u32 pad1;
20 	u32 color_enable;		/* 0x18 */
21 	u32 pad2;
22 	u32 cq_head;			/* 0x20 */
23 	u32 pad3;
24 	u32 cq_tail;			/* 0x28 */
25 	u32 pad4;
26 	u32 cq_tail_color;		/* 0x30 */
27 	u32 pad5;
28 	u32 interrupt_enable;		/* 0x38 */
29 	u32 pad6;
30 	u32 cq_entry_enable;		/* 0x40 */
31 	u32 pad7;
32 	u32 cq_message_enable;		/* 0x48 */
33 	u32 pad8;
34 	u32 interrupt_offset;		/* 0x50 */
35 	u32 pad9;
36 	u64 cq_message_addr;		/* 0x58 */
37 	u32 pad10;
38 };
39 
40 struct vnic_rx_bytes_counter {
41 	unsigned int small_pkt_bytes_cnt;
42 	unsigned int large_pkt_bytes_cnt;
43 };
44 
45 struct vnic_cq {
46 	unsigned int index;
47 	struct vnic_dev *vdev;
48 	struct vnic_cq_ctrl __iomem *ctrl;              /* memory-mapped */
49 	struct vnic_dev_ring ring;
50 	unsigned int to_clean;
51 	unsigned int last_color;
52 	unsigned int interrupt_offset;
53 	struct vnic_rx_bytes_counter pkt_size_counter;
54 	unsigned int cur_rx_coal_timeval;
55 	unsigned int tobe_rx_coal_timeval;
56 	ktime_t prev_ts;
57 };
58 
59 static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
60 	unsigned int work_to_do,
61 	int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
62 	u8 type, u16 q_number, u16 completed_index, void *opaque),
63 	void *opaque)
64 {
65 	struct cq_desc *cq_desc;
66 	unsigned int work_done = 0;
67 	u16 q_number, completed_index;
68 	u8 type, color;
69 
70 	cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
71 		cq->ring.desc_size * cq->to_clean);
72 	cq_desc_dec(cq_desc, &type, &color,
73 		&q_number, &completed_index);
74 
75 	while (color != cq->last_color) {
76 
77 		if ((*q_service)(cq->vdev, cq_desc, type,
78 			q_number, completed_index, opaque))
79 			break;
80 
81 		cq->to_clean++;
82 		if (cq->to_clean == cq->ring.desc_count) {
83 			cq->to_clean = 0;
84 			cq->last_color = cq->last_color ? 0 : 1;
85 		}
86 
87 		cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
88 			cq->ring.desc_size * cq->to_clean);
89 		cq_desc_dec(cq_desc, &type, &color,
90 			&q_number, &completed_index);
91 
92 		work_done++;
93 		if (work_done >= work_to_do)
94 			break;
95 	}
96 
97 	return work_done;
98 }
99 
100 void vnic_cq_free(struct vnic_cq *cq);
101 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
102 	unsigned int desc_count, unsigned int desc_size);
103 void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
104 	unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
105 	unsigned int cq_tail_color, unsigned int interrupt_enable,
106 	unsigned int cq_entry_enable, unsigned int message_enable,
107 	unsigned int interrupt_offset, u64 message_addr);
108 void vnic_cq_clean(struct vnic_cq *cq);
109 
110 #endif /* _VNIC_CQ_H_ */
111