1/*
2 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
4 *
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16 * SOFTWARE.
17 *
18 */
19
20#ifndef _VNIC_CQ_H_
21#define _VNIC_CQ_H_
22
23#include "cq_desc.h"
24#include "vnic_dev.h"
25
26/* Completion queue control */
27struct vnic_cq_ctrl {
28	u64 ring_base;			/* 0x00 */
29	u32 ring_size;			/* 0x08 */
30	u32 pad0;
31	u32 flow_control_enable;	/* 0x10 */
32	u32 pad1;
33	u32 color_enable;		/* 0x18 */
34	u32 pad2;
35	u32 cq_head;			/* 0x20 */
36	u32 pad3;
37	u32 cq_tail;			/* 0x28 */
38	u32 pad4;
39	u32 cq_tail_color;		/* 0x30 */
40	u32 pad5;
41	u32 interrupt_enable;		/* 0x38 */
42	u32 pad6;
43	u32 cq_entry_enable;		/* 0x40 */
44	u32 pad7;
45	u32 cq_message_enable;		/* 0x48 */
46	u32 pad8;
47	u32 interrupt_offset;		/* 0x50 */
48	u32 pad9;
49	u64 cq_message_addr;		/* 0x58 */
50	u32 pad10;
51};
52
53struct vnic_rx_bytes_counter {
54	unsigned int small_pkt_bytes_cnt;
55	unsigned int large_pkt_bytes_cnt;
56};
57
58struct vnic_cq {
59	unsigned int index;
60	struct vnic_dev *vdev;
61	struct vnic_cq_ctrl __iomem *ctrl;              /* memory-mapped */
62	struct vnic_dev_ring ring;
63	unsigned int to_clean;
64	unsigned int last_color;
65	unsigned int interrupt_offset;
66	struct vnic_rx_bytes_counter pkt_size_counter;
67	unsigned int cur_rx_coal_timeval;
68	unsigned int tobe_rx_coal_timeval;
69	ktime_t prev_ts;
70};
71
72static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
73	unsigned int work_to_do,
74	int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
75	u8 type, u16 q_number, u16 completed_index, void *opaque),
76	void *opaque)
77{
78	struct cq_desc *cq_desc;
79	unsigned int work_done = 0;
80	u16 q_number, completed_index;
81	u8 type, color;
82
83	cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
84		cq->ring.desc_size * cq->to_clean);
85	cq_desc_dec(cq_desc, &type, &color,
86		&q_number, &completed_index);
87
88	while (color != cq->last_color) {
89
90		if ((*q_service)(cq->vdev, cq_desc, type,
91			q_number, completed_index, opaque))
92			break;
93
94		cq->to_clean++;
95		if (cq->to_clean == cq->ring.desc_count) {
96			cq->to_clean = 0;
97			cq->last_color = cq->last_color ? 0 : 1;
98		}
99
100		cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
101			cq->ring.desc_size * cq->to_clean);
102		cq_desc_dec(cq_desc, &type, &color,
103			&q_number, &completed_index);
104
105		work_done++;
106		if (work_done >= work_to_do)
107			break;
108	}
109
110	return work_done;
111}
112
113void vnic_cq_free(struct vnic_cq *cq);
114int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
115	unsigned int desc_count, unsigned int desc_size);
116void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
117	unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
118	unsigned int cq_tail_color, unsigned int interrupt_enable,
119	unsigned int cq_entry_enable, unsigned int message_enable,
120	unsigned int interrupt_offset, u64 message_addr);
121void vnic_cq_clean(struct vnic_cq *cq);
122
123#endif /* _VNIC_CQ_H_ */
124