1 /*
2 * Copyright 2014 Cisco Systems, Inc. All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18 #ifndef _VNIC_CQ_H_
19 #define _VNIC_CQ_H_
20
21 #include "cq_desc.h"
22 #include "vnic_dev.h"
23
24 /* Completion queue control */
25 struct vnic_cq_ctrl {
26 u64 ring_base; /* 0x00 */
27 u32 ring_size; /* 0x08 */
28 u32 pad0;
29 u32 flow_control_enable; /* 0x10 */
30 u32 pad1;
31 u32 color_enable; /* 0x18 */
32 u32 pad2;
33 u32 cq_head; /* 0x20 */
34 u32 pad3;
35 u32 cq_tail; /* 0x28 */
36 u32 pad4;
37 u32 cq_tail_color; /* 0x30 */
38 u32 pad5;
39 u32 interrupt_enable; /* 0x38 */
40 u32 pad6;
41 u32 cq_entry_enable; /* 0x40 */
42 u32 pad7;
43 u32 cq_message_enable; /* 0x48 */
44 u32 pad8;
45 u32 interrupt_offset; /* 0x50 */
46 u32 pad9;
47 u64 cq_message_addr; /* 0x58 */
48 u32 pad10;
49 };
50
51 struct vnic_cq {
52 unsigned int index;
53 struct vnic_dev *vdev;
54 struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */
55 struct vnic_dev_ring ring;
56 unsigned int to_clean;
57 unsigned int last_color;
58 };
59
svnic_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)60 static inline unsigned int svnic_cq_service(struct vnic_cq *cq,
61 unsigned int work_to_do,
62 int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
63 u8 type, u16 q_number, u16 completed_index, void *opaque),
64 void *opaque)
65 {
66 struct cq_desc *cq_desc;
67 unsigned int work_done = 0;
68 u16 q_number, completed_index;
69 u8 type, color;
70
71 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
72 cq->ring.desc_size * cq->to_clean);
73 cq_desc_dec(cq_desc, &type, &color,
74 &q_number, &completed_index);
75
76 while (color != cq->last_color) {
77
78 if ((*q_service)(cq->vdev, cq_desc, type,
79 q_number, completed_index, opaque))
80 break;
81
82 cq->to_clean++;
83 if (cq->to_clean == cq->ring.desc_count) {
84 cq->to_clean = 0;
85 cq->last_color = cq->last_color ? 0 : 1;
86 }
87
88 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
89 cq->ring.desc_size * cq->to_clean);
90 cq_desc_dec(cq_desc, &type, &color,
91 &q_number, &completed_index);
92
93 work_done++;
94 if (work_done >= work_to_do)
95 break;
96 }
97
98 return work_done;
99 }
100
101 void svnic_cq_free(struct vnic_cq *cq);
102 int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
103 unsigned int index, unsigned int desc_count, unsigned int desc_size);
104 void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
105 unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
106 unsigned int cq_tail_color, unsigned int interrupt_enable,
107 unsigned int cq_entry_enable, unsigned int message_enable,
108 unsigned int interrupt_offset, u64 message_addr);
109 void svnic_cq_clean(struct vnic_cq *cq);
110 #endif /* _VNIC_CQ_H_ */
111