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vnic_cq.h
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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 */
35 struct 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 
61 struct 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 
70 static 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;
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 
111 void vnic_cq_free(struct vnic_cq *cq);
112 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
113  unsigned int desc_count, unsigned int desc_size);
114 void 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);
119 void vnic_cq_clean(struct vnic_cq *cq);
120 
121 #endif /* _VNIC_CQ_H_ */