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vnic_cq.h
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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 */
27 struct vnic_cq_ctrl {
28  u64 ring_base; /* 0x00 */
29  u32 ring_size; /* 0x08 */
33  u32 color_enable; /* 0x18 */
35  u32 cq_head; /* 0x20 */
37  u32 cq_tail; /* 0x28 */
39  u32 cq_tail_color; /* 0x30 */
41  u32 interrupt_enable; /* 0x38 */
43  u32 cq_entry_enable; /* 0x40 */
45  u32 cq_message_enable; /* 0x48 */
47  u32 interrupt_offset; /* 0x50 */
49  u64 cq_message_addr; /* 0x58 */
51 };
52 
53 struct vnic_cq {
54  unsigned int index;
55  struct vnic_dev *vdev;
56  struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */
58  unsigned int to_clean;
59  unsigned int last_color;
60  unsigned int interrupt_offset;
61 };
62 
63 static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
64  unsigned int work_to_do,
65  int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
66  u8 type, u16 q_number, u16 completed_index, void *opaque),
67  void *opaque)
68 {
69  struct cq_desc *cq_desc;
70  unsigned int work_done = 0;
72  u8 type, color;
73 
74  cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
75  cq->ring.desc_size * cq->to_clean);
76  cq_desc_dec(cq_desc, &type, &color,
77  &q_number, &completed_index);
78 
79  while (color != cq->last_color) {
80 
81  if ((*q_service)(cq->vdev, cq_desc, type,
82  q_number, completed_index, opaque))
83  break;
84 
85  cq->to_clean++;
86  if (cq->to_clean == cq->ring.desc_count) {
87  cq->to_clean = 0;
88  cq->last_color = cq->last_color ? 0 : 1;
89  }
90 
91  cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
92  cq->ring.desc_size * cq->to_clean);
93  cq_desc_dec(cq_desc, &type, &color,
94  &q_number, &completed_index);
95 
96  work_done++;
97  if (work_done >= work_to_do)
98  break;
99  }
100 
101  return work_done;
102 }
103 
104 void vnic_cq_free(struct vnic_cq *cq);
105 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
106  unsigned int desc_count, unsigned int desc_size);
107 void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
108  unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
109  unsigned int cq_tail_color, unsigned int interrupt_enable,
110  unsigned int cq_entry_enable, unsigned int message_enable,
111  unsigned int interrupt_offset, u64 message_addr);
112 void vnic_cq_clean(struct vnic_cq *cq);
113 
114 #endif /* _VNIC_CQ_H_ */