1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (C) 2013-2014 Vincenzo Maffione 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * $FreeBSD$ 31 */ 32 33 34 #ifdef linux 35 #include "bsd_glue.h" 36 #elif defined (_WIN32) 37 #include "win_glue.h" 38 #else /* __FreeBSD__ */ 39 #include <sys/param.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/systm.h> 43 #include <sys/mbuf.h> 44 #endif /* __FreeBSD__ */ 45 46 #include "netmap_mbq.h" 47 48 49 static inline void __mbq_init(struct mbq *q) 50 { 51 q->head = q->tail = NULL; 52 q->count = 0; 53 } 54 55 56 void mbq_safe_init(struct mbq *q) 57 { 58 mtx_init(&q->lock, "mbq", NULL, MTX_SPIN); 59 __mbq_init(q); 60 } 61 62 63 void mbq_init(struct mbq *q) 64 { 65 __mbq_init(q); 66 } 67 68 69 static inline void __mbq_enqueue(struct mbq *q, struct mbuf *m) 70 { 71 m->m_nextpkt = NULL; 72 if (q->tail) { 73 q->tail->m_nextpkt = m; 74 q->tail = m; 75 } else { 76 q->head = q->tail = m; 77 } 78 q->count++; 79 } 80 81 82 void mbq_safe_enqueue(struct mbq *q, struct mbuf *m) 83 { 84 mbq_lock(q); 85 __mbq_enqueue(q, m); 86 mbq_unlock(q); 87 } 88 89 90 void mbq_enqueue(struct mbq *q, struct mbuf *m) 91 { 92 __mbq_enqueue(q, m); 93 } 94 95 96 static inline struct mbuf *__mbq_dequeue(struct mbq *q) 97 { 98 struct mbuf *ret = NULL; 99 100 if (q->head) { 101 ret = q->head; 102 q->head = ret->m_nextpkt; 103 if (q->head == NULL) { 104 q->tail = NULL; 105 } 106 q->count--; 107 ret->m_nextpkt = NULL; 108 } 109 110 return ret; 111 } 112 113 114 struct mbuf *mbq_safe_dequeue(struct mbq *q) 115 { 116 struct mbuf *ret; 117 118 mbq_lock(q); 119 ret = __mbq_dequeue(q); 120 mbq_unlock(q); 121 122 return ret; 123 } 124 125 126 struct mbuf *mbq_dequeue(struct mbq *q) 127 { 128 return __mbq_dequeue(q); 129 } 130 131 132 /* XXX seems pointless to have a generic purge */ 133 static void __mbq_purge(struct mbq *q, int safe) 134 { 135 struct mbuf *m; 136 137 for (;;) { 138 m = safe ? mbq_safe_dequeue(q) : mbq_dequeue(q); 139 if (m) { 140 m_freem(m); 141 } else { 142 break; 143 } 144 } 145 } 146 147 148 void mbq_purge(struct mbq *q) 149 { 150 __mbq_purge(q, 0); 151 } 152 153 154 void mbq_safe_purge(struct mbq *q) 155 { 156 __mbq_purge(q, 1); 157 } 158 159 160 void mbq_safe_fini(struct mbq *q) 161 { 162 mtx_destroy(&q->lock); 163 } 164 165 166 void mbq_fini(struct mbq *q) 167 { 168 } 169