1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright 2014 Cisco Systems, Inc. All rights reserved.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * This program is free software; you may redistribute it and/or modify
5*4882a593Smuzhiyun * it under the terms of the GNU General Public License as published by
6*4882a593Smuzhiyun * the Free Software Foundation; version 2 of the License.
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9*4882a593Smuzhiyun * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10*4882a593Smuzhiyun * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11*4882a593Smuzhiyun * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12*4882a593Smuzhiyun * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13*4882a593Smuzhiyun * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14*4882a593Smuzhiyun * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15*4882a593Smuzhiyun * SOFTWARE.
16*4882a593Smuzhiyun */
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #ifndef _VNIC_CQ_H_
19*4882a593Smuzhiyun #define _VNIC_CQ_H_
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include "cq_desc.h"
22*4882a593Smuzhiyun #include "vnic_dev.h"
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun /* Completion queue control */
25*4882a593Smuzhiyun struct vnic_cq_ctrl {
26*4882a593Smuzhiyun u64 ring_base; /* 0x00 */
27*4882a593Smuzhiyun u32 ring_size; /* 0x08 */
28*4882a593Smuzhiyun u32 pad0;
29*4882a593Smuzhiyun u32 flow_control_enable; /* 0x10 */
30*4882a593Smuzhiyun u32 pad1;
31*4882a593Smuzhiyun u32 color_enable; /* 0x18 */
32*4882a593Smuzhiyun u32 pad2;
33*4882a593Smuzhiyun u32 cq_head; /* 0x20 */
34*4882a593Smuzhiyun u32 pad3;
35*4882a593Smuzhiyun u32 cq_tail; /* 0x28 */
36*4882a593Smuzhiyun u32 pad4;
37*4882a593Smuzhiyun u32 cq_tail_color; /* 0x30 */
38*4882a593Smuzhiyun u32 pad5;
39*4882a593Smuzhiyun u32 interrupt_enable; /* 0x38 */
40*4882a593Smuzhiyun u32 pad6;
41*4882a593Smuzhiyun u32 cq_entry_enable; /* 0x40 */
42*4882a593Smuzhiyun u32 pad7;
43*4882a593Smuzhiyun u32 cq_message_enable; /* 0x48 */
44*4882a593Smuzhiyun u32 pad8;
45*4882a593Smuzhiyun u32 interrupt_offset; /* 0x50 */
46*4882a593Smuzhiyun u32 pad9;
47*4882a593Smuzhiyun u64 cq_message_addr; /* 0x58 */
48*4882a593Smuzhiyun u32 pad10;
49*4882a593Smuzhiyun };
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun struct vnic_cq {
52*4882a593Smuzhiyun unsigned int index;
53*4882a593Smuzhiyun struct vnic_dev *vdev;
54*4882a593Smuzhiyun struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */
55*4882a593Smuzhiyun struct vnic_dev_ring ring;
56*4882a593Smuzhiyun unsigned int to_clean;
57*4882a593Smuzhiyun unsigned int last_color;
58*4882a593Smuzhiyun };
59*4882a593Smuzhiyun
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*4882a593Smuzhiyun static inline unsigned int svnic_cq_service(struct vnic_cq *cq,
61*4882a593Smuzhiyun unsigned int work_to_do,
62*4882a593Smuzhiyun int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
63*4882a593Smuzhiyun u8 type, u16 q_number, u16 completed_index, void *opaque),
64*4882a593Smuzhiyun void *opaque)
65*4882a593Smuzhiyun {
66*4882a593Smuzhiyun struct cq_desc *cq_desc;
67*4882a593Smuzhiyun unsigned int work_done = 0;
68*4882a593Smuzhiyun u16 q_number, completed_index;
69*4882a593Smuzhiyun u8 type, color;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
72*4882a593Smuzhiyun cq->ring.desc_size * cq->to_clean);
73*4882a593Smuzhiyun cq_desc_dec(cq_desc, &type, &color,
74*4882a593Smuzhiyun &q_number, &completed_index);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun while (color != cq->last_color) {
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun if ((*q_service)(cq->vdev, cq_desc, type,
79*4882a593Smuzhiyun q_number, completed_index, opaque))
80*4882a593Smuzhiyun break;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun cq->to_clean++;
83*4882a593Smuzhiyun if (cq->to_clean == cq->ring.desc_count) {
84*4882a593Smuzhiyun cq->to_clean = 0;
85*4882a593Smuzhiyun cq->last_color = cq->last_color ? 0 : 1;
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
89*4882a593Smuzhiyun cq->ring.desc_size * cq->to_clean);
90*4882a593Smuzhiyun cq_desc_dec(cq_desc, &type, &color,
91*4882a593Smuzhiyun &q_number, &completed_index);
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun work_done++;
94*4882a593Smuzhiyun if (work_done >= work_to_do)
95*4882a593Smuzhiyun break;
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun return work_done;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun void svnic_cq_free(struct vnic_cq *cq);
102*4882a593Smuzhiyun int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
103*4882a593Smuzhiyun unsigned int index, unsigned int desc_count, unsigned int desc_size);
104*4882a593Smuzhiyun void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
105*4882a593Smuzhiyun unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
106*4882a593Smuzhiyun unsigned int cq_tail_color, unsigned int interrupt_enable,
107*4882a593Smuzhiyun unsigned int cq_entry_enable, unsigned int message_enable,
108*4882a593Smuzhiyun unsigned int interrupt_offset, u64 message_addr);
109*4882a593Smuzhiyun void svnic_cq_clean(struct vnic_cq *cq);
110*4882a593Smuzhiyun #endif /* _VNIC_CQ_H_ */
111