1 /* $KAME: if_altq.h,v 1.11 2003/07/10 12:07:50 kjc Exp $ */
4 * Copyright (C) 1997-2003
5 * Sony Computer Science Laboratories Inc. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #ifndef _NET_ALTQ_IF_ALTQ_H_
29 #define _NET_ALTQ_IF_ALTQ_H_
31 #ifndef _SYS_SERIALIZE_H_
32 #include <sys/serialize.h>
35 /* Default subqueue */
36 #define ALTQ_SUBQ_INDEX_DEFAULT 0
44 typedef int (*altq_mapsubq_t)(struct ifaltq *, int);
46 typedef int (*ifsq_enqueue_t)(struct ifaltq_subque *, struct mbuf *,
47 struct altq_pktattr *);
48 typedef struct mbuf *(*ifsq_dequeue_t)(struct ifaltq_subque *, int);
49 typedef int (*ifsq_request_t)(struct ifaltq_subque *, int, void *);
52 struct ifaltq_subque *stg_subq;
56 TAILQ_ENTRY(ifsubq_stage) stg_link;
59 #define IFSQ_STAGE_FLAG_QUED 0x1
60 #define IFSQ_STAGE_FLAG_SCHED 0x2
62 struct ifaltq_subque {
63 struct lwkt_serialize ifsq_lock;
66 struct ifaltq *ifsq_altq;
67 struct ifnet *ifsq_ifp;
68 void *ifsq_hw_priv; /* hw private data */
70 struct mbuf *ifsq_head;
71 struct mbuf *ifsq_tail;
75 ifsq_enqueue_t ifsq_enqueue;
76 ifsq_dequeue_t ifsq_dequeue;
77 ifsq_request_t ifsq_request;
79 struct lwkt_serialize *ifsq_hw_serialize;
81 struct mbuf *ifsq_prepended;/* mbuf dequeued, but not yet xmit */
82 int ifsq_started; /* ifnet.if_start interlock */
83 int ifsq_hw_oactive;/* hw too busy, protected by driver */
84 int ifsq_cpuid; /* owner cpu */
85 struct ifsubq_stage *ifsq_stage;/* packet staging information */
86 struct netmsg_base *ifsq_ifstart_nmsg;
87 /* percpu msgs to sched if_start */
92 #define ALTQ_SQ_ASSERT_LOCKED(ifsq) ASSERT_SERIALIZED(&(ifsq)->ifsq_lock)
93 #define ALTQ_SQ_LOCK_INIT(ifsq) lwkt_serialize_init(&(ifsq)->ifsq_lock)
94 #define ALTQ_SQ_LOCK(ifsq) \
95 lwkt_serialize_adaptive_enter(&(ifsq)->ifsq_lock)
96 #define ALTQ_SQ_UNLOCK(ifsq) lwkt_serialize_exit(&(ifsq)->ifsq_lock)
98 #define ASSERT_ALTQ_SQ_SERIALIZED_HW(ifsq) \
99 ASSERT_SERIALIZED((ifsq)->ifsq_hw_serialize)
100 #define ASSERT_ALTQ_SQ_NOT_SERIALIZED_HW(ifsq) \
101 ASSERT_NOT_SERIALIZED((ifsq)->ifsq_hw_serialize)
106 * Structure defining a queue for a network interface.
109 /* alternate queueing related fields */
110 int altq_type; /* discipline type */
111 int altq_flags; /* flags (e.g. ready, in-use) */
112 void *altq_disc; /* for discipline-specific use */
113 struct ifnet *altq_ifp; /* back pointer to interface */
115 /* classifier fields */
116 void *altq_clfier; /* classifier-specific use */
117 void *(*altq_classify)(struct ifaltq *, struct mbuf *,
118 struct altq_pktattr *);
120 /* token bucket regulator */
121 struct tb_regulator *altq_tbr;
123 /* Sub-queues mapping */
124 altq_mapsubq_t altq_mapsubq;
125 uint32_t altq_subq_mask;
129 struct ifaltq_subque *altq_subq;
136 #define ALTQ_LOCK(ifq) \
137 ALTQ_SQ_LOCK(&(ifq)->altq_subq[ALTQ_SUBQ_INDEX_DEFAULT])
139 #define ALTQ_UNLOCK(ifq) \
140 ALTQ_SQ_UNLOCK(&(ifq)->altq_subq[ALTQ_SUBQ_INDEX_DEFAULT])
146 * packet attributes used by queueing disciplines.
147 * pattr_class is a discipline-dependent scheduling class that is
148 * set by a classifier.
149 * pattr_hdr and pattr_af may be used by a discipline to access
150 * the header within a mbuf. (e.g. ECN needs to update the CE bit)
151 * note that pattr_hdr could be stale after m_pullup, though link
152 * layer output routines usually don't use m_pullup. link-level
153 * compression also invalidates these fields. thus, pattr_hdr needs
154 * to be verified when a discipline touches the header.
156 struct altq_pktattr {
157 void *pattr_class; /* sched class set by classifier */
158 int pattr_af; /* address family */
159 caddr_t pattr_hdr; /* saved header position in mbuf */
163 * a token-bucket regulator limits the rate that a network driver can
164 * dequeue packets from the output queue.
165 * modern cards are able to buffer a large amount of packets and dequeue
166 * too many packets at a time. this bursty dequeue behavior makes it
167 * impossible to schedule packets by queueing disciplines.
168 * a token-bucket is used to control the burst size in a device
169 * independent manner.
171 struct tb_regulator {
172 int64_t tbr_rate; /* (scaled) token bucket rate */
173 int64_t tbr_depth; /* (scaled) token bucket depth */
175 int64_t tbr_token; /* (scaled) current token */
176 int64_t tbr_filluptime; /* (scaled) time to fill up bucket */
177 uint64_t tbr_last; /* last time token was updated */
179 int tbr_lastop; /* last dequeue operation type
180 needed for poll-and-dequeue */
184 #define ALTQF_READY 0x01 /* driver supports alternate queueing */
185 #define ALTQF_ENABLED 0x02 /* altq is in use */
186 #define ALTQF_CLASSIFY 0x04 /* classify packets */
187 #define ALTQF_DRIVER1 0x40 /* driver specific */
189 /* if_altqflags set internally only: */
190 #define ALTQF_CANTCHANGE (ALTQF_READY)
192 /* altq_dequeue 2nd arg */
193 #define ALTDQ_REMOVE 1 /* dequeue mbuf from the queue */
194 #define ALTDQ_POLL 2 /* don't dequeue mbuf from the queue */
196 /* altq request types (currently only purge is defined) */
197 #define ALTRQ_PURGE 1 /* purge all packets */
199 int altq_attach(struct ifaltq *, int, void *, altq_mapsubq_t,
200 ifsq_enqueue_t, ifsq_dequeue_t, ifsq_request_t, void *,
201 void *(*)(struct ifaltq *, struct mbuf *, struct altq_pktattr *));
202 int altq_detach(struct ifaltq *);
203 int altq_enable(struct ifaltq *);
204 int altq_disable(struct ifaltq *);
205 struct mbuf *tbr_dequeue(struct ifaltq_subque *, int);
206 extern int (*altq_input)(struct mbuf *, int);
209 #endif /* _NET_ALTQ_IF_ALTQ_H_ */