freebsd-dev/sys/dev/netmap/netmap_mbq.h
Luigi Rizzo 997b054cf1 introduce mbq_lock() and mbq_unlock() for the mbq,
so it is easier to buil the same code on linux
(this generalizes the change in svn 267142)

MFC after:	3 days
2014-06-06 18:02:32 +00:00

89 lines
2.7 KiB
C

/*
* Copyright (C) 2013-2014 Vincenzo Maffione. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* $FreeBSD$
*/
#ifndef __NETMAP_MBQ_H__
#define __NETMAP_MBQ_H__
/*
* These function implement an mbuf tailq with an optional lock.
* The base functions act ONLY ON THE QUEUE, whereas the "safe"
* variants (mbq_safe_*) also handle the lock.
*/
/* XXX probably rely on a previous definition of SPINLOCK_T */
#ifdef linux
#define SPINLOCK_T safe_spinlock_t
#else
#define SPINLOCK_T struct mtx
#endif
/* A FIFO queue of mbufs with an optional lock. */
struct mbq {
struct mbuf *head;
struct mbuf *tail;
int count;
SPINLOCK_T lock;
};
/* XXX "destroy" does not match "init" as a name.
* We should also clarify whether init can be used while
* holding a lock, and whether mbq_safe_destroy() is a NOP.
*/
void mbq_init(struct mbq *q);
void mbq_destroy(struct mbq *q);
void mbq_enqueue(struct mbq *q, struct mbuf *m);
struct mbuf *mbq_dequeue(struct mbq *q);
void mbq_purge(struct mbq *q);
static inline void
mbq_lock(struct mbq *q)
{
mtx_lock_spin(&q->lock);
}
static inline void
mbq_unlock(struct mbq *q)
{
mtx_unlock_spin(&q->lock);
}
void mbq_safe_init(struct mbq *q);
void mbq_safe_destroy(struct mbq *q);
void mbq_safe_enqueue(struct mbq *q, struct mbuf *m);
struct mbuf *mbq_safe_dequeue(struct mbq *q);
void mbq_safe_purge(struct mbq *q);
static inline unsigned int mbq_len(struct mbq *q)
{
return q->count;
}
#endif /* __NETMAP_MBQ_H_ */