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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* Definitions for the 'struct skb_array' datastructure.
*
* Author:
* Michael S. Tsirkin <mst@redhat.com>
*
* Copyright (C) 2016 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* Limited-size FIFO of skbs. Can be used more or less whenever
* sk_buff_head can be used, except you need to know the queue size in
* advance.
* Implemented as a type-safe wrapper around ptr_ring.
*/
#ifndef _LINUX_SKB_ARRAY_H
#define _LINUX_SKB_ARRAY_H 1
#ifdef __KERNEL__
#include <linux/ptr_ring.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#endif
struct skb_array {
struct ptr_ring ring;
};
/* Might be slightly faster than skb_array_full below, but callers invoking
* this in a loop must use a compiler barrier, for example cpu_relax().
*/
static inline bool __skb_array_full(struct skb_array *a)
{
return __ptr_ring_full(&a->ring);
}
static inline bool skb_array_full(struct skb_array *a)
{
return ptr_ring_full(&a->ring);
}
static inline int skb_array_produce(struct skb_array *a, struct sk_buff *skb)
{
return ptr_ring_produce(&a->ring, skb);
}
static inline int skb_array_produce_irq(struct skb_array *a, struct sk_buff *skb)
{
return ptr_ring_produce_irq(&a->ring, skb);
}
static inline int skb_array_produce_bh(struct skb_array *a, struct sk_buff *skb)
{
return ptr_ring_produce_bh(&a->ring, skb);
}
static inline int skb_array_produce_any(struct skb_array *a, struct sk_buff *skb)
{
return ptr_ring_produce_any(&a->ring, skb);
}
/* Might be slightly faster than skb_array_empty below, but only safe if the
* array is never resized. Also, callers invoking this in a loop must take care
* to use a compiler barrier, for example cpu_relax().
*/
static inline bool __skb_array_empty(struct skb_array *a)
{
return !__ptr_ring_peek(&a->ring);
}
static inline bool skb_array_empty(struct skb_array *a)
{
return ptr_ring_empty(&a->ring);
}
static inline bool skb_array_empty_bh(struct skb_array *a)
{
return ptr_ring_empty_bh(&a->ring);
}
static inline bool skb_array_empty_irq(struct skb_array *a)
{
return ptr_ring_empty_irq(&a->ring);
}
static inline bool skb_array_empty_any(struct skb_array *a)
{
return ptr_ring_empty_any(&a->ring);
}
static inline struct sk_buff *skb_array_consume(struct skb_array *a)
{
return ptr_ring_consume(&a->ring);
}
static inline struct sk_buff *skb_array_consume_irq(struct skb_array *a)
{
return ptr_ring_consume_irq(&a->ring);
}
static inline struct sk_buff *skb_array_consume_any(struct skb_array *a)
{
return ptr_ring_consume_any(&a->ring);
}
static inline struct sk_buff *skb_array_consume_bh(struct skb_array *a)
{
return ptr_ring_consume_bh(&a->ring);
}
static inline int __skb_array_len_with_tag(struct sk_buff *skb)
{
if (likely(skb)) {
int len = skb->len;
if (skb_vlan_tag_present(skb))
len += VLAN_HLEN;
return len;
} else {
return 0;
}
}
static inline int skb_array_peek_len(struct skb_array *a)
{
return PTR_RING_PEEK_CALL(&a->ring, __skb_array_len_with_tag);
}
static inline int skb_array_peek_len_irq(struct skb_array *a)
{
return PTR_RING_PEEK_CALL_IRQ(&a->ring, __skb_array_len_with_tag);
}
static inline int skb_array_peek_len_bh(struct skb_array *a)
{
return PTR_RING_PEEK_CALL_BH(&a->ring, __skb_array_len_with_tag);
}
static inline int skb_array_peek_len_any(struct skb_array *a)
{
return PTR_RING_PEEK_CALL_ANY(&a->ring, __skb_array_len_with_tag);
}
static inline int skb_array_init(struct skb_array *a, int size, gfp_t gfp)
{
return ptr_ring_init(&a->ring, size, gfp);
}
static void __skb_array_destroy_skb(void *ptr)
{
kfree_skb(ptr);
}
static inline int skb_array_resize(struct skb_array *a, int size, gfp_t gfp)
{
return ptr_ring_resize(&a->ring, size, gfp, __skb_array_destroy_skb);
}
static inline int skb_array_resize_multiple(struct skb_array **rings,
int nrings, unsigned int size,
gfp_t gfp)
{
BUILD_BUG_ON(offsetof(struct skb_array, ring));
return ptr_ring_resize_multiple((struct ptr_ring **)rings,
nrings, size, gfp,
__skb_array_destroy_skb);
}
static inline void skb_array_cleanup(struct skb_array *a)
{
ptr_ring_cleanup(&a->ring, __skb_array_destroy_skb);
}
#endif /* _LINUX_SKB_ARRAY_H */
|
