1262152Sluigi/* 2262152Sluigi * Copyright (C) 2013-2014 Vincenzo Maffione. All rights reserved. 3262152Sluigi * 4262152Sluigi * Redistribution and use in source and binary forms, with or without 5262152Sluigi * modification, are permitted provided that the following conditions 6262152Sluigi * are met: 7262152Sluigi * 1. Redistributions of source code must retain the above copyright 8262152Sluigi * notice, this list of conditions and the following disclaimer. 9262152Sluigi * 2. Redistributions in binary form must reproduce the above copyright 10262152Sluigi * notice, this list of conditions and the following disclaimer in the 11262152Sluigi * documentation and/or other materials provided with the distribution. 12262152Sluigi * 13262152Sluigi * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14262152Sluigi * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15262152Sluigi * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16262152Sluigi * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17262152Sluigi * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18262152Sluigi * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19262152Sluigi * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20262152Sluigi * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21262152Sluigi * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22262152Sluigi * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23262152Sluigi * SUCH DAMAGE. 24262152Sluigi */ 25262152Sluigi 26262152Sluigi/* 27262152Sluigi * $FreeBSD: releng/10.2/sys/dev/netmap/netmap_mbq.h 270252 2014-08-20 23:34:36Z luigi $ 28262152Sluigi */ 29262152Sluigi 30262152Sluigi 31262152Sluigi#ifndef __NETMAP_MBQ_H__ 32262152Sluigi#define __NETMAP_MBQ_H__ 33262152Sluigi 34262152Sluigi/* 35262152Sluigi * These function implement an mbuf tailq with an optional lock. 36262152Sluigi * The base functions act ONLY ON THE QUEUE, whereas the "safe" 37262152Sluigi * variants (mbq_safe_*) also handle the lock. 38262152Sluigi */ 39262152Sluigi 40262152Sluigi/* XXX probably rely on a previous definition of SPINLOCK_T */ 41262152Sluigi#ifdef linux 42262152Sluigi#define SPINLOCK_T safe_spinlock_t 43262152Sluigi#else 44262152Sluigi#define SPINLOCK_T struct mtx 45262152Sluigi#endif 46262152Sluigi 47262152Sluigi/* A FIFO queue of mbufs with an optional lock. */ 48262152Sluigistruct mbq { 49262152Sluigi struct mbuf *head; 50262152Sluigi struct mbuf *tail; 51262152Sluigi int count; 52262152Sluigi SPINLOCK_T lock; 53262152Sluigi}; 54262152Sluigi 55262152Sluigi/* XXX "destroy" does not match "init" as a name. 56262152Sluigi * We should also clarify whether init can be used while 57262152Sluigi * holding a lock, and whether mbq_safe_destroy() is a NOP. 58262152Sluigi */ 59262152Sluigivoid mbq_init(struct mbq *q); 60262152Sluigivoid mbq_destroy(struct mbq *q); 61262152Sluigivoid mbq_enqueue(struct mbq *q, struct mbuf *m); 62262152Sluigistruct mbuf *mbq_dequeue(struct mbq *q); 63262152Sluigivoid mbq_purge(struct mbq *q); 64262152Sluigi 65267282Sluigistatic inline void 66267282Sluigimbq_lock(struct mbq *q) 67267282Sluigi{ 68267282Sluigi mtx_lock_spin(&q->lock); 69267282Sluigi} 70262152Sluigi 71267282Sluigistatic inline void 72267282Sluigimbq_unlock(struct mbq *q) 73267282Sluigi{ 74267282Sluigi mtx_unlock_spin(&q->lock); 75267282Sluigi} 76267282Sluigi 77270252Sluigi 78262152Sluigivoid mbq_safe_init(struct mbq *q); 79262152Sluigivoid mbq_safe_destroy(struct mbq *q); 80262152Sluigivoid mbq_safe_enqueue(struct mbq *q, struct mbuf *m); 81262152Sluigistruct mbuf *mbq_safe_dequeue(struct mbq *q); 82262152Sluigivoid mbq_safe_purge(struct mbq *q); 83262152Sluigi 84262152Sluigistatic inline unsigned int mbq_len(struct mbq *q) 85262152Sluigi{ 86262152Sluigi return q->count; 87262152Sluigi} 88262152Sluigi 89262152Sluigi#endif /* __NETMAP_MBQ_H_ */ 90