1 /************************************************************************** 2 3 Copyright (c) 2007, Chelsio Inc. 4 All rights reserved. 5 6 Redistribution and use in source and binary forms, with or without 7 modification, are permitted provided that the following conditions are met: 8 9 1. Redistributions of source code must retain the above copyright notice, 10 this list of conditions and the following disclaimer. 11 12 2. Neither the name of the Chelsio Corporation nor the names of its 13 contributors may be used to endorse or promote products derived from 14 this software without specific prior written permission. 15 16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE 20 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 POSSIBILITY OF SUCH DAMAGE. 27 28 ***************************************************************************/ 29 30 #ifndef CXGB_MBUFQ_H_ 31 #define CXGB_MBUFQ_H_ 32 33 #include <sys/mbuf.h> 34 35 struct mbuf_head { 36 struct mbuf *head; 37 struct mbuf *tail; 38 uint32_t qlen; 39 struct mtx lock; 40 }; 41 42 static __inline void 43 mbufq_init(struct mbuf_head *l) 44 { 45 l->head = l->tail = NULL; 46 } 47 48 static __inline int 49 mbufq_empty(struct mbuf_head *l) 50 { 51 return (l->head == NULL); 52 } 53 54 static __inline int 55 mbufq_len(struct mbuf_head *l) 56 { 57 return (l->qlen); 58 } 59 60 61 static __inline void 62 mbufq_tail(struct mbuf_head *l, struct mbuf *m) 63 { 64 l->qlen++; 65 l->tail->m_nextpkt = m; 66 l->tail = m; 67 } 68 69 static __inline struct mbuf * 70 mbufq_dequeue(struct mbuf_head *l) 71 { 72 struct mbuf *m; 73 74 m = l->head; 75 if (m) { 76 if (m == l->tail) 77 l->tail = NULL; 78 l->head = m->m_nextpkt; 79 l->qlen--; 80 } 81 82 return (m); 83 } 84 85 static __inline struct mbuf * 86 mbufq_peek(struct mbuf_head *l) 87 { 88 return (l->head); 89 } 90 91 #endif /* CXGB_MBUFQ_H_ */ 92