/*
* Copyright (C) 1997-2003
* 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_
/*
* 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;
uint64_t ifq_drops;
kmutex_t *ifq_lock;
/* 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 mbuf *(*altq_dequeue)(struct ifaltq *, int);
int (*altq_request)(struct ifaltq *, int, void *);
/* 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 */
void * pattr_hdr; /* saved header position in mbuf */
};
/*
* mbuf tag to carry a queue id (and hints for ECN).
*/
struct altq_tag {
u_int32_t qid; /* queue id */
/* hints for ecn */
int af; /* address family */
void *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 */
