blob: c1658da685a330e0ec0f6f3aa2130bd05eea0c6b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/* SPDX-License-Identifier: (BSD-3-Clause OR LGPL-2.1)
* Copyright(c) 2010-2013 Intel Corporation.
* Copyright(c) 2013-2017 Wind River Systems, Inc.
*/
#ifndef _RTE_AVP_FIFO_H_
#define _RTE_AVP_FIFO_H_
#include "rte_avp_common.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __KERNEL__
/* Write memory barrier for kernel compiles */
#define AVP_WMB() smp_wmb()
/* Read memory barrier for kernel compiles */
#define AVP_RMB() smp_rmb()
#else
/* Write memory barrier for userspace compiles */
#define AVP_WMB() rte_wmb()
/* Read memory barrier for userspace compiles */
#define AVP_RMB() rte_rmb()
#endif
#ifndef __KERNEL__
#include <rte_debug.h>
/**
* Initializes the avp fifo structure
*/
static inline void
avp_fifo_init(struct rte_avp_fifo *fifo, unsigned int size)
{
/* Ensure size is power of 2 */
if (size & (size - 1))
rte_panic("AVP fifo size must be power of 2\n");
fifo->write = 0;
fifo->read = 0;
fifo->len = size;
fifo->elem_size = sizeof(void *);
}
#endif
/**
* Adds num elements into the fifo. Return the number actually written
*/
static inline unsigned
avp_fifo_put(struct rte_avp_fifo *fifo, void **data, unsigned int num)
{
unsigned int i = 0;
unsigned int fifo_write = fifo->write;
unsigned int fifo_read = fifo->read;
unsigned int new_write = fifo_write;
for (i = 0; i < num; i++) {
new_write = (new_write + 1) & (fifo->len - 1);
if (new_write == fifo_read)
break;
fifo->buffer[fifo_write] = data[i];
fifo_write = new_write;
}
AVP_WMB();
fifo->write = fifo_write;
return i;
}
/**
* Get up to num elements from the fifo. Return the number actually read
*/
static inline unsigned int
avp_fifo_get(struct rte_avp_fifo *fifo, void **data, unsigned int num)
{
unsigned int i = 0;
unsigned int new_read = fifo->read;
unsigned int fifo_write = fifo->write;
if (new_read == fifo_write)
return 0; /* empty */
for (i = 0; i < num; i++) {
if (new_read == fifo_write)
break;
data[i] = fifo->buffer[new_read];
new_read = (new_read + 1) & (fifo->len - 1);
}
AVP_RMB();
fifo->read = new_read;
return i;
}
/**
* Get the num of elements in the fifo
*/
static inline unsigned int
avp_fifo_count(struct rte_avp_fifo *fifo)
{
return (fifo->len + fifo->write - fifo->read) & (fifo->len - 1);
}
/**
* Get the num of available elements in the fifo
*/
static inline unsigned int
avp_fifo_free_count(struct rte_avp_fifo *fifo)
{
return (fifo->read - fifo->write - 1) & (fifo->len - 1);
}
#ifdef __cplusplus
}
#endif
#endif /* _RTE_AVP_FIFO_H_ */
|
