1 /* $KAME: altq_classq.h,v 1.6 2003/01/07 07:33:38 kjc Exp $ */
2 /* $DragonFly: src/sys/net/altq/altq_classq.h,v 1.1 2005/02/11 22:25:57 joerg Exp $ */
5 * Copyright (c) 1991-1997 Regents of the University of California.
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18 * This product includes software developed by the Network Research
19 * Group at Lawrence Berkeley Laboratory.
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37 * class queue definitions extracted from rm_class.h.
39 #ifndef _ALTQ_ALTQ_CLASSQ_H_
40 #define _ALTQ_ALTQ_CLASSQ_H_
43 * Packet Queue types: RED or DROPHEAD.
45 #define Q_DROPHEAD 0x00
48 #define Q_DROPTAIL 0x03
53 * Packet Queue structures and macros to manipulate them.
55 struct _class_queue_ {
56 struct mbuf *tail_; /* Tail of packet queue */
57 int qlen_; /* Queue length (in number of packets) */
58 int qlim_; /* Queue limit (in number of packets*) */
59 int qtype_; /* Queue type */
62 typedef struct _class_queue_ class_queue_t;
64 #define qtype(q) (q)->qtype_ /* Get queue type */
65 #define qlimit(q) (q)->qlim_ /* Max packets to be queued */
66 #define qlen(q) (q)->qlen_ /* Current queue length. */
67 #define qtail(q) (q)->tail_ /* Tail of the queue */
68 #define qhead(q) ((q)->tail_ ? (q)->tail_->m_nextpkt : NULL)
70 #define qempty(q) ((q)->qlen_ == 0) /* Is the queue empty?? */
71 #define q_is_red(q) ((q)->qtype_ == Q_RED) /* Is the queue a red queue */
72 #define q_is_rio(q) ((q)->qtype_ == Q_RIO) /* Is the queue a rio queue */
73 #define q_is_red_or_rio(q) ((q)->qtype_ == Q_RED || (q)->qtype_ == Q_RIO)
76 _addq(class_queue_t *q, struct mbuf *m)
80 if ((m0 = qtail(q)) != NULL)
81 m->m_nextpkt = m0->m_nextpkt;
89 static __inline struct mbuf *
90 _getq(class_queue_t *q)
94 if ((m = qtail(q)) == NULL)
96 if ((m0 = m->m_nextpkt) != m)
97 m->m_nextpkt = m0->m_nextpkt;
101 m0->m_nextpkt = NULL;
105 /* drop a packet at the tail of the queue */
106 static __inline struct mbuf *
107 _getq_tail(class_queue_t *q)
109 struct mbuf *m, *m0, *prev;
111 if ((m = m0 = qtail(q)) == NULL)
117 prev->m_nextpkt = m->m_nextpkt;
127 /* randomly select a packet in the queue */
128 static __inline struct mbuf *
129 _getq_random(class_queue_t *q)
134 if ((m = qtail(q)) == NULL)
136 if (m->m_nextpkt == m)
139 struct mbuf *prev = NULL;
141 n = random() % qlen(q) + 1;
142 for (i = 0; i < n; i++) {
146 prev->m_nextpkt = m->m_nextpkt;
156 _removeq(class_queue_t *q, struct mbuf *m)
158 struct mbuf *m0, *prev;
165 prev->m_nextpkt = m->m_nextpkt;
168 else if (qtail(q) == m)
174 _flushq(class_queue_t *q)
178 while ((m = _getq(q)) != NULL)
184 #endif /* _ALTQ_ALTQ_CLASSQ_H_ */