Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-4.9 / f8e56c42e4e3527f629682ca123f881c1bea8500 / . / drivers / scsi / fnic / vnic_cq.h
blob: 4ede6809fb1eea73f36d38930250586bcf97b424 [file] [log] [blame]
Abhijeet Joglekar5df6d732009-04-17 18:33:26 -0700[diff] [blame]1/*
2 * Copyright 2008 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#ifndef _VNIC_CQ_H_
19#define _VNIC_CQ_H_
20
21#include "cq_desc.h"
22#include "vnic_dev.h"
23
24/*
25 * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth
26 * Driver) when both are built with CONFIG options =y
27 */
28#define vnic_cq_service fnic_cq_service
29#define vnic_cq_free fnic_cq_free
30#define vnic_cq_alloc fnic_cq_alloc
31#define vnic_cq_init fnic_cq_init
32#define vnic_cq_clean fnic_cq_clean
33
34/* Completion queue control */
35struct vnic_cq_ctrl {
36 u64 ring_base; /* 0x00 */
37 u32 ring_size; /* 0x08 */
38 u32 pad0;
39 u32 flow_control_enable; /* 0x10 */
40 u32 pad1;
41 u32 color_enable; /* 0x18 */
42 u32 pad2;
43 u32 cq_head; /* 0x20 */
44 u32 pad3;
45 u32 cq_tail; /* 0x28 */
46 u32 pad4;
47 u32 cq_tail_color; /* 0x30 */
48 u32 pad5;
49 u32 interrupt_enable; /* 0x38 */
50 u32 pad6;
51 u32 cq_entry_enable; /* 0x40 */
52 u32 pad7;
53 u32 cq_message_enable; /* 0x48 */
54 u32 pad8;
55 u32 interrupt_offset; /* 0x50 */
56 u32 pad9;
57 u64 cq_message_addr; /* 0x58 */
58 u32 pad10;
59};
60
61struct vnic_cq {
62 unsigned int index;
63 struct vnic_dev *vdev;
64 struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */
65 struct vnic_dev_ring ring;
66 unsigned int to_clean;
67 unsigned int last_color;
68};
69
70static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
71 unsigned int work_to_do,
72 int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
73 u8 type, u16 q_number, u16 completed_index, void *opaque),
74 void *opaque)
75{
76 struct cq_desc *cq_desc;
77 unsigned int work_done = 0;
78 u16 q_number, completed_index;
79 u8 type, color;
80
81 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
82 cq->ring.desc_size * cq->to_clean);
83 cq_desc_dec(cq_desc, &type, &color,
84 &q_number, &completed_index);
85
86 while (color != cq->last_color) {
87
88 if ((*q_service)(cq->vdev, cq_desc, type,
89 q_number, completed_index, opaque))
90 break;
91
92 cq->to_clean++;
93 if (cq->to_clean == cq->ring.desc_count) {
94 cq->to_clean = 0;
95 cq->last_color = cq->last_color ? 0 : 1;
96 }
97
98 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
99 cq->ring.desc_size * cq->to_clean);
100 cq_desc_dec(cq_desc, &type, &color,
101 &q_number, &completed_index);
102
103 work_done++;
104 if (work_done >= work_to_do)
105 break;
106 }
107
108 return work_done;
109}
110
111void vnic_cq_free(struct vnic_cq *cq);
112int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
113 unsigned int desc_count, unsigned int desc_size);
114void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
115 unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
116 unsigned int cq_tail_color, unsigned int interrupt_enable,
117 unsigned int cq_entry_enable, unsigned int message_enable,
118 unsigned int interrupt_offset, u64 message_addr);
119void vnic_cq_clean(struct vnic_cq *cq);
120
121#endif /* _VNIC_CQ_H_ */