/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* From: @(#)if.h 8.1 (Berkeley) 6/10/93
*/
#include <sys/param.h>
#include <sys/socket.h>
#ifndef ALTQ
#define ALTQ /* Needed for ifq.h prototypes only. */
#endif
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/ifq.h>
int
drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m)
{
int error = 0;
if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
IFQ_ENQUEUE(&ifp->if_snd, m, error);
if (error)
if_inc_counter((ifp), IFCOUNTER_OQDROPS, 1);
return (error);
}
error = buf_ring_enqueue(br, m);
if (error)
m_freem(m);
return (error);
}
void
drbr_putback(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m_new)
{
/*
* The top of the list needs to be swapped
* for this one.
*/
if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
/*
* Peek in altq case dequeued it
* so put it back.
*/
IFQ_DRV_PREPEND(&ifp->if_snd, m_new);
return;
}
buf_ring_putback_sc(br, m_new);
}
struct mbuf *
drbr_peek(struct ifnet *ifp, struct buf_ring *br)
{
struct mbuf *m;
if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
/*
* Pull it off like a dequeue
* since drbr_advance() does nothing
* for altq and drbr_putback() will
* use the old prepend function.
*/
IFQ_DEQUEUE(&ifp->if_snd, m);
return (m);
}
return ((struct mbuf *)buf_ring_peek_clear_sc(br));
}
void
drbr_flush(struct ifnet *ifp, struct buf_ring *br)
{
struct mbuf *m;
if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
IFQ_PURGE(&ifp->if_snd);
while ((m = (struct mbuf *)buf_ring_dequeue_sc(br)) != NULL)
m_freem(m);
}
struct mbuf *
drbr_dequeue(struct ifnet *ifp, struct buf_ring *br)
{
struct mbuf *m;
if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
IFQ_DEQUEUE(&ifp->if_snd, m);
return (m);
}
return ((struct mbuf *)buf_ring_dequeue_sc(br));
}
void
drbr_advance(struct ifnet *ifp, struct buf_ring *br)
{
/* Nothing to do here since peek dequeues in altq case */
if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
return;
return (buf_ring_advance_sc(br));
}
struct mbuf *
drbr_dequeue_cond(struct ifnet *ifp, struct buf_ring *br,
int (*func) (struct mbuf *, void *), void *arg)
{
struct mbuf *m;
if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
IFQ_LOCK(&ifp->if_snd);
IFQ_POLL_NOLOCK(&ifp->if_snd, m);
if (m != NULL && func(m, arg) == 0) {
IFQ_UNLOCK(&ifp->if_snd);
return (NULL);
}
IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m);
IFQ_UNLOCK(&ifp->if_snd);
return (m);
}
m = (struct mbuf *)buf_ring_peek(br);
if (m == NULL || func(m, arg) == 0)
return (NULL);
return ((struct mbuf *)buf_ring_dequeue_sc(br));
}
int
drbr_empty(struct ifnet *ifp, struct buf_ring *br)
{
if (ALTQ_IS_ENABLED(&ifp->if_snd))
return (IFQ_IS_EMPTY(&ifp->if_snd));
return (buf_ring_empty(br));
}
int
drbr_needs_enqueue(struct ifnet *ifp, struct buf_ring *br)
{
if (ALTQ_IS_ENABLED(&ifp->if_snd))
return (1);
return (!buf_ring_empty(br));
}
int
drbr_inuse(struct ifnet *ifp, struct buf_ring *br)
{
if (ALTQ_IS_ENABLED(&ifp->if_snd))
return (ifp->if_snd.ifq_len);
return (buf_ring_count(br));
}
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