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+/* $KAME: altq_classq.h,v 1.6 2003/01/07 07:33:38 kjc Exp $ */
+
+/*
+ * Copyright (c) 1991-1997 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the Network Research
+ * Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory 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.
+ */
+/*
+ * class queue definitions extracted from rm_class.h.
+ */
+#ifndef _ALTQ_ALTQ_CLASSQ_H_
+#define _ALTQ_ALTQ_CLASSQ_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Packet Queue types: RED or DROPHEAD.
+ */
+#define Q_DROPHEAD 0x00
+#define Q_RED 0x01
+#define Q_RIO 0x02
+#define Q_DROPTAIL 0x03
+
+#ifdef _KERNEL
+
+/*
+ * Packet Queue structures and macros to manipulate them.
+ */
+struct _class_queue_ {
+ struct mbuf *tail_; /* Tail of packet queue */
+ int qlen_; /* Queue length (in number of packets) */
+ int qlim_; /* Queue limit (in number of packets*) */
+ int qtype_; /* Queue type */
+};
+
+typedef struct _class_queue_ class_queue_t;
+
+#define qtype(q) (q)->qtype_ /* Get queue type */
+#define qlimit(q) (q)->qlim_ /* Max packets to be queued */
+#define qlen(q) (q)->qlen_ /* Current queue length. */
+#define qtail(q) (q)->tail_ /* Tail of the queue */
+#define qhead(q) ((q)->tail_ ? (q)->tail_->m_nextpkt : NULL)
+
+#define qempty(q) ((q)->qlen_ == 0) /* Is the queue empty?? */
+#define q_is_red(q) ((q)->qtype_ == Q_RED) /* Is the queue a red queue */
+#define q_is_rio(q) ((q)->qtype_ == Q_RIO) /* Is the queue a rio queue */
+#define q_is_red_or_rio(q) ((q)->qtype_ == Q_RED || (q)->qtype_ == Q_RIO)
+
+#if !defined(__GNUC__) || defined(ALTQ_DEBUG)
+
+extern void _addq(class_queue_t *, struct mbuf *);
+extern struct mbuf *_getq(class_queue_t *);
+extern struct mbuf *_getq_tail(class_queue_t *);
+extern struct mbuf *_getq_random(class_queue_t *);
+extern void _removeq(class_queue_t *, struct mbuf *);
+extern void _flushq(class_queue_t *);
+
+#else /* __GNUC__ && !ALTQ_DEBUG */
+/*
+ * inlined versions
+ */
+static __inline void
+_addq(class_queue_t *q, struct mbuf *m)
+{
+ struct mbuf *m0;
+
+ if ((m0 = qtail(q)) != NULL)
+ m->m_nextpkt = m0->m_nextpkt;
+ else
+ m0 = m;
+ m0->m_nextpkt = m;
+ qtail(q) = m;
+ qlen(q)++;
+}
+
+static __inline struct mbuf *
+_getq(class_queue_t *q)
+{
+ struct mbuf *m, *m0;
+
+ if ((m = qtail(q)) == NULL)
+ return (NULL);
+ if ((m0 = m->m_nextpkt) != m)
+ m->m_nextpkt = m0->m_nextpkt;
+ else
+ qtail(q) = NULL;
+ qlen(q)--;
+ m0->m_nextpkt = NULL;
+ return (m0);
+}
+
+/* drop a packet at the tail of the queue */
+static __inline struct mbuf *
+_getq_tail(class_queue_t *q)
+{
+ struct mbuf *m, *m0, *prev;
+
+ if ((m = m0 = qtail(q)) == NULL)
+ return NULL;
+ do {
+ prev = m0;
+ m0 = m0->m_nextpkt;
+ } while (m0 != m);
+ prev->m_nextpkt = m->m_nextpkt;
+ if (prev == m)
+ qtail(q) = NULL;
+ else
+ qtail(q) = prev;
+ qlen(q)--;
+ m->m_nextpkt = NULL;
+ return (m);
+}
+
+/* randomly select a packet in the queue */
+static __inline struct mbuf *
+_getq_random(class_queue_t *q)
+{
+ struct mbuf *m;
+ int i, n;
+
+ if ((m = qtail(q)) == NULL)
+ return NULL;
+ if (m->m_nextpkt == m)
+ qtail(q) = NULL;
+ else {
+ struct mbuf *prev = NULL;
+
+ n = random() % qlen(q) + 1;
+ for (i = 0; i < n; i++) {
+ prev = m;
+ m = m->m_nextpkt;
+ }
+ prev->m_nextpkt = m->m_nextpkt;
+ if (m == qtail(q))
+ qtail(q) = prev;
+ }
+ qlen(q)--;
+ m->m_nextpkt = NULL;
+ return (m);
+}
+
+static __inline void
+_removeq(class_queue_t *q, struct mbuf *m)
+{
+ struct mbuf *m0, *prev;
+
+ m0 = qtail(q);
+ do {
+ prev = m0;
+ m0 = m0->m_nextpkt;
+ } while (m0 != m);
+ prev->m_nextpkt = m->m_nextpkt;
+ if (prev == m)
+ qtail(q) = NULL;
+ else if (qtail(q) == m)
+ qtail(q) = prev;
+ qlen(q)--;
+}
+
+static __inline void
+_flushq(class_queue_t *q)
+{
+ struct mbuf *m;
+
+ while ((m = _getq(q)) != NULL)
+ m_freem(m);
+}
+
+#endif /* __GNUC__ && !ALTQ_DEBUG */
+
+#endif /* _KERNEL */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ALTQ_ALTQ_CLASSQ_H_ */