1 /*
2 * Copyright (C) 2013-2014 Vincenzo Maffione
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 /*
28 * $FreeBSD$
29 */
30
31
32 #ifdef linux
33 #include "bsd_glue.h"
34 #elif defined (_WIN32)
35 #include "win_glue.h"
36 #else /* __FreeBSD__ */
37 #include <sys/param.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/systm.h>
41 #include <sys/mbuf.h>
42 #endif /* __FreeBSD__ */
43
44 #include "netmap_mbq.h"
45
46
__mbq_init(struct mbq * q)47 static inline void __mbq_init(struct mbq *q)
48 {
49 q->head = q->tail = NULL;
50 q->count = 0;
51 }
52
53
mbq_safe_init(struct mbq * q)54 void mbq_safe_init(struct mbq *q)
55 {
56 mtx_init(&q->lock, "mbq", NULL, MTX_SPIN);
57 __mbq_init(q);
58 }
59
60
mbq_init(struct mbq * q)61 void mbq_init(struct mbq *q)
62 {
63 __mbq_init(q);
64 }
65
66
__mbq_enqueue(struct mbq * q,struct mbuf * m)67 static inline void __mbq_enqueue(struct mbq *q, struct mbuf *m)
68 {
69 m->m_nextpkt = NULL;
70 if (q->tail) {
71 q->tail->m_nextpkt = m;
72 q->tail = m;
73 } else {
74 q->head = q->tail = m;
75 }
76 q->count++;
77 }
78
79
mbq_safe_enqueue(struct mbq * q,struct mbuf * m)80 void mbq_safe_enqueue(struct mbq *q, struct mbuf *m)
81 {
82 mbq_lock(q);
83 __mbq_enqueue(q, m);
84 mbq_unlock(q);
85 }
86
87
mbq_enqueue(struct mbq * q,struct mbuf * m)88 void mbq_enqueue(struct mbq *q, struct mbuf *m)
89 {
90 __mbq_enqueue(q, m);
91 }
92
93
__mbq_dequeue(struct mbq * q)94 static inline struct mbuf *__mbq_dequeue(struct mbq *q)
95 {
96 struct mbuf *ret = NULL;
97
98 if (q->head) {
99 ret = q->head;
100 q->head = ret->m_nextpkt;
101 if (q->head == NULL) {
102 q->tail = NULL;
103 }
104 q->count--;
105 ret->m_nextpkt = NULL;
106 }
107
108 return ret;
109 }
110
111
mbq_safe_dequeue(struct mbq * q)112 struct mbuf *mbq_safe_dequeue(struct mbq *q)
113 {
114 struct mbuf *ret;
115
116 mbq_lock(q);
117 ret = __mbq_dequeue(q);
118 mbq_unlock(q);
119
120 return ret;
121 }
122
123
mbq_dequeue(struct mbq * q)124 struct mbuf *mbq_dequeue(struct mbq *q)
125 {
126 return __mbq_dequeue(q);
127 }
128
129
130 /* XXX seems pointless to have a generic purge */
__mbq_purge(struct mbq * q,int safe)131 static void __mbq_purge(struct mbq *q, int safe)
132 {
133 struct mbuf *m;
134
135 for (;;) {
136 m = safe ? mbq_safe_dequeue(q) : mbq_dequeue(q);
137 if (m) {
138 m_freem(m);
139 } else {
140 break;
141 }
142 }
143 }
144
145
mbq_purge(struct mbq * q)146 void mbq_purge(struct mbq *q)
147 {
148 __mbq_purge(q, 0);
149 }
150
151
mbq_safe_purge(struct mbq * q)152 void mbq_safe_purge(struct mbq *q)
153 {
154 __mbq_purge(q, 1);
155 }
156
157
mbq_safe_fini(struct mbq * q)158 void mbq_safe_fini(struct mbq *q)
159 {
160 mtx_destroy(&q->lock);
161 }
162
163
mbq_fini(struct mbq * q)164 void mbq_fini(struct mbq *q)
165 {
166 }
167