freebsd-dev/sys/dev/netmap/netmap_mbq.c
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

164 lines
3.3 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.
*/
/*
* $FreeBSD$
*/
#ifdef linux
#include "bsd_glue.h"
#else /* __FreeBSD__ */
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#endif /* __FreeBSD__ */
#include "netmap_mbq.h"
static inline void __mbq_init(struct mbq *q)
{
q->head = q->tail = NULL;
q->count = 0;
}
void mbq_safe_init(struct mbq *q)
{
mtx_init(&q->lock, "mbq", NULL, MTX_SPIN);
__mbq_init(q);
}
void mbq_init(struct mbq *q)
{
__mbq_init(q);
}
static inline void __mbq_enqueue(struct mbq *q, struct mbuf *m)
{
m->m_nextpkt = NULL;
if (q->tail) {
q->tail->m_nextpkt = m;
q->tail = m;
} else {
q->head = q->tail = m;
}
q->count++;
}
void mbq_safe_enqueue(struct mbq *q, struct mbuf *m)
{
mbq_lock(q);
__mbq_enqueue(q, m);
mbq_unlock(q);
}
void mbq_enqueue(struct mbq *q, struct mbuf *m)
{
__mbq_enqueue(q, m);
}
static inline struct mbuf *__mbq_dequeue(struct mbq *q)
{
struct mbuf *ret = NULL;
if (q->head) {
ret = q->head;
q->head = ret->m_nextpkt;
if (q->head == NULL) {
q->tail = NULL;
}
q->count--;
ret->m_nextpkt = NULL;
}
return ret;
}
struct mbuf *mbq_safe_dequeue(struct mbq *q)
{
struct mbuf *ret;
mbq_lock(q);
ret = __mbq_dequeue(q);
mbq_unlock(q);
return ret;
}
struct mbuf *mbq_dequeue(struct mbq *q)
{
return __mbq_dequeue(q);
}
/* XXX seems pointless to have a generic purge */
static void __mbq_purge(struct mbq *q, int safe)
{
struct mbuf *m;
for (;;) {
m = safe ? mbq_safe_dequeue(q) : mbq_dequeue(q);
if (m) {
m_freem(m);
} else {
break;
}
}
}
void mbq_purge(struct mbq *q)
{
__mbq_purge(q, 0);
}
void mbq_safe_purge(struct mbq *q)
{
__mbq_purge(q, 1);
}
void mbq_safe_destroy(struct mbq *q)
{
mtx_destroy(&q->lock);
}
void mbq_destroy(struct mbq *q)
{
}