blob: ac26a8c0b1ac9275dd844b7fc7bc77df37ea3ee2 (
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
|
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
/**
* Initializes the kni fifo structure
*/
static void
kni_fifo_init(struct rte_kni_fifo *fifo, unsigned size)
{
/* Ensure size is power of 2 */
if (size & (size - 1))
rte_panic("KNI fifo size must be power of 2\n");
fifo->write = 0;
fifo->read = 0;
fifo->len = size;
fifo->elem_size = sizeof(void *);
}
/**
* Adds num elements into the fifo. Return the number actually written
*/
static inline unsigned
kni_fifo_put(struct rte_kni_fifo *fifo, void **data, unsigned num)
{
unsigned i = 0;
unsigned fifo_write = fifo->write;
unsigned fifo_read = fifo->read;
unsigned 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;
}
fifo->write = fifo_write;
return i;
}
/**
* Get up to num elements from the fifo. Return the number actually read
*/
static inline unsigned
kni_fifo_get(struct rte_kni_fifo *fifo, void **data, unsigned num)
{
unsigned i = 0;
unsigned new_read = fifo->read;
unsigned fifo_write = fifo->write;
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);
}
fifo->read = new_read;
return i;
}
/**
* Get the num of elements in the fifo
*/
static inline uint32_t
kni_fifo_count(struct rte_kni_fifo *fifo)
{
return (fifo->len + fifo->write - fifo->read) & (fifo->len - 1);
}
|
