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/* $OpenBSD: if_altq.h,v 1.12 2009/05/31 19:15:59 claudio Exp $ */
/* $KAME: if_altq.h,v 1.6 2001/01/29 19:59:09 itojun Exp $ */
/*
* Copyright (C) 1997-2000
* Sony Computer Science Laboratories Inc. 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 SONY CSL 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 SONY CSL 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.
*/
#ifndef _ALTQ_IF_ALTQ_H_
#define _ALTQ_IF_ALTQ_H_
struct altq_pktattr; struct tb_regulator; struct top_cdnr;
/*
* Structure defining a queue for a network interface.
*/
struct ifaltq {
/* fields compatible with struct ifqueue */
struct mbuf *ifq_head;
struct mbuf *ifq_tail;
int ifq_len;
int ifq_maxlen;
int ifq_drops;
struct timeout *ifq_congestion;
/* alternate queueing related fields */
int altq_type; /* discipline type */
int altq_flags; /* flags (e.g. ready, in-use) */
void *altq_disc; /* for discipline-specific use */
struct ifnet *altq_ifp; /* back pointer to interface */
int (*altq_enqueue)(struct ifaltq *, struct mbuf *,
struct altq_pktattr *);
struct mbuf *(*altq_dequeue)(struct ifaltq *, int);
int (*altq_request)(struct ifaltq *, int, void *);
/* classifier fields */
void *altq_clfier; /* classifier-specific use */
void *(*altq_classify)(void *, struct mbuf *, int);
/* token bucket regulator */
struct tb_regulator *altq_tbr;
/* input traffic conditioner (doesn't belong to the output queue...) */
struct top_cdnr *altq_cdnr;
};
#ifdef _KERNEL
/*
* packet attributes used by queueing disciplines.
* pattr_class is a discipline-dependent scheduling class that is
* set by a classifier.
* pattr_hdr and pattr_af may be used by a discipline to access
* the header within a mbuf. (e.g. ECN needs to update the CE bit)
* note that pattr_hdr could be stale after m_pullup, though link
* layer output routines usually don't use m_pullup. link-level
* compression also invalidates these fields. thus, pattr_hdr needs
* to be verified when a discipline touches the header.
*/
struct altq_pktattr {
void *pattr_class; /* sched class set by classifier */
int pattr_af; /* address family */
caddr_t pattr_hdr; /* saved header position in mbuf */
};
/*
* a token-bucket regulator limits the rate that a network driver can
* dequeue packets from the output queue.
* modern cards are able to buffer a large amount of packets and dequeue
* too many packets at a time. this bursty dequeue behavior makes it
* impossible to schedule packets by queueing disciplines.
* a token-bucket is used to control the burst size in a device
* independent manner.
*/
struct tb_regulator {
int64_t tbr_rate; /* (scaled) token bucket rate */
int64_t tbr_depth; /* (scaled) token bucket depth */
int64_t tbr_token; /* (scaled) current token */
int64_t tbr_filluptime; /* (scaled) time to fill up bucket */
u_int64_t tbr_last; /* last time token was updated */
int tbr_lastop; /* last dequeue operation type
needed for poll-and-dequeue */
};
/* if_altqflags */
#define ALTQF_READY 0x01 /* driver supports alternate queueing */
#define ALTQF_ENABLED 0x02 /* altq is in use */
#define ALTQF_CLASSIFY 0x04 /* classify packets */
#define ALTQF_CNDTNING 0x08 /* altq traffic conditioning is enabled */
#define ALTQF_DRIVER1 0x40 /* driver specific */
/* if_altqflags set internally only: */
#define ALTQF_CANTCHANGE (ALTQF_READY)
/* altq_dequeue 2nd arg */
#define ALTDQ_REMOVE 1 /* dequeue mbuf from the queue */
#define ALTDQ_POLL 2 /* don't dequeue mbuf from the queue */
/* altq request types (currently only purge is defined) */
#define ALTRQ_PURGE 1 /* purge all packets */
#define ALTQ_IS_READY(ifq) ((ifq)->altq_flags & ALTQF_READY)
#define ALTQ_IS_ENABLED(ifq) ((ifq)->altq_flags & ALTQF_ENABLED)
#define ALTQ_NEEDS_CLASSIFY(ifq) ((ifq)->altq_flags & ALTQF_CLASSIFY)
#define ALTQ_IS_CNDTNING(ifq) ((ifq)->altq_flags & ALTQF_CNDTNING)
#define ALTQ_SET_CNDTNING(ifq) ((ifq)->altq_flags |= ALTQF_CNDTNING)
#define ALTQ_CLEAR_CNDTNING(ifq) ((ifq)->altq_flags &= ~ALTQF_CNDTNING)
#define ALTQ_IS_ATTACHED(ifq) ((ifq)->altq_disc != NULL)
#define ALTQ_ENQUEUE(ifq, m, pa, err) \
(err) = (*(ifq)->altq_enqueue)((ifq),(m),(pa))
#define ALTQ_DEQUEUE(ifq, m) \
(m) = (*(ifq)->altq_dequeue)((ifq), ALTDQ_REMOVE)
#define ALTQ_POLL(ifq, m) \
(m) = (*(ifq)->altq_dequeue)((ifq), ALTDQ_POLL)
#define ALTQ_PURGE(ifq) \
(void)(*(ifq)->altq_request)((ifq), ALTRQ_PURGE, (void *)0)
#define ALTQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0)
#define TBR_IS_ENABLED(ifq) ((ifq)->altq_tbr != NULL)
extern int altq_attach(struct ifaltq *, int, void *,
int (*)(struct ifaltq *, struct mbuf *,
struct altq_pktattr *),
struct mbuf *(*)(struct ifaltq *, int),
int (*)(struct ifaltq *, int, void *),
void *,
void *(*)(void *, struct mbuf *, int));
extern int altq_detach(struct ifaltq *);
extern int altq_enable(struct ifaltq *);
extern int altq_disable(struct ifaltq *);
extern struct mbuf *tbr_dequeue(struct ifaltq *, int);
extern int (*altq_input)(struct mbuf *, int);
#endif /* _KERNEL */
#endif /* _ALTQ_IF_ALTQ_H_ */
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