sys/altq/if_altq.h

   1 /*      $NetBSD: if_altq.h,v 1.12 2007/03/04 05:59:03 christos Exp $    */
   2 /*      $KAME: if_altq.h,v 1.12 2005/04/13 03:44:25 suz Exp $   */
   3
   4 /*
   5  * Copyright (C) 1997-2003
   6  *      Sony Computer Science Laboratories Inc.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 #ifndef _ALTQ_IF_ALTQ_H_
  30 #define _ALTQ_IF_ALTQ_H_
  31
  32 #if defined(_KERNEL_OPT)
  33 #include "opt_altq_enabled.h"
  34 #endif
  35
  36 struct altq_pktattr; struct tb_regulator; struct top_cdnr;
  37
  38 /*
  39  * Structure defining a queue for a network interface.
  40  */
  41 struct  ifaltq {
  42         /* fields compatible with struct ifqueue */
  43         struct  mbuf *ifq_head;
  44         struct  mbuf *ifq_tail;
  45         int     ifq_len;
  46         int     ifq_maxlen;
  47         int     ifq_drops;
  48
  49         /* alternate queueing related fields */
  50         int     altq_type;              /* discipline type */
  51         int     altq_flags;             /* flags (e.g. ready, in-use) */
  52         void    *altq_disc;             /* for discipline-specific use */
  53         struct  ifnet *altq_ifp;        /* back pointer to interface */
  54
  55         int     (*altq_enqueue)(struct ifaltq *, struct mbuf *,
  56                                 struct altq_pktattr *);
  57         struct  mbuf *(*altq_dequeue)(struct ifaltq *, int);
  58         int     (*altq_request)(struct ifaltq *, int, void *);
  59
  60         /* classifier fields */
  61         void    *altq_clfier;           /* classifier-specific use */
  62         void    *(*altq_classify)(void *, struct mbuf *, int);
  63
  64         /* token bucket regulator */
  65         struct  tb_regulator *altq_tbr;
  66
  67         /* input traffic conditioner (doesn't belong to the output queue...) */
  68         struct top_cdnr *altq_cdnr;
  69 };
  70
  71
  72 #ifdef _KERNEL
  73
  74 /*
  75  * packet attributes used by queueing disciplines.
  76  * pattr_class is a discipline-dependent scheduling class that is
  77  * set by a classifier.
  78  * pattr_hdr and pattr_af may be used by a discipline to access
  79  * the header within a mbuf.  (e.g. ECN needs to update the CE bit)
  80  * note that pattr_hdr could be stale after m_pullup, though link
  81  * layer output routines usually don't use m_pullup.  link-level
  82  * compression also invalidates these fields.  thus, pattr_hdr needs
  83  * to be verified when a discipline touches the header.
  84  */
  85 struct altq_pktattr {
  86         void    *pattr_class;           /* sched class set by classifier */
  87         int     pattr_af;               /* address family */
  88         void *  pattr_hdr;              /* saved header position in mbuf */
  89 };
  90
  91 /*
  92  * mbuf tag to carry a queue id (and hints for ECN).
  93  */
  94 struct altq_tag {
  95         u_int32_t       qid;            /* queue id */
  96         /* hints for ecn */
  97         int             af;             /* address family */
  98         void            *hdr;           /* saved header position in mbuf */
  99 };
 100
 101 /*
 102  * a token-bucket regulator limits the rate that a network driver can
 103  * dequeue packets from the output queue.
 104  * modern cards are able to buffer a large amount of packets and dequeue
 105  * too many packets at a time.  this bursty dequeue behavior makes it
 106  * impossible to schedule packets by queueing disciplines.
 107  * a token-bucket is used to control the burst size in a device
 108  * independent manner.
 109  */
 110 struct tb_regulator {
 111         int64_t         tbr_rate;       /* (scaled) token bucket rate */
 112         int64_t         tbr_depth;      /* (scaled) token bucket depth */
 113
 114         int64_t         tbr_token;      /* (scaled) current token */
 115         int64_t         tbr_filluptime; /* (scaled) time to fill up bucket */
 116         u_int64_t       tbr_last;       /* last time token was updated */
 117
 118         int             tbr_lastop;     /* last dequeue operation type
 119                                            needed for poll-and-dequeue */
 120 };
 121
 122 /* if_altqflags */
 123 #define ALTQF_READY      0x01   /* driver supports alternate queueing */
 124 #define ALTQF_ENABLED    0x02   /* altq is in use */
 125 #define ALTQF_CLASSIFY   0x04   /* classify packets */
 126 #define ALTQF_CNDTNING   0x08   /* altq traffic conditioning is enabled */
 127 #define ALTQF_DRIVER1    0x40   /* driver specific */
 128
 129 /* if_altqflags set internally only: */
 130 #define ALTQF_CANTCHANGE        (ALTQF_READY)
 131
 132 /* altq_dequeue 2nd arg */
 133 #define ALTDQ_REMOVE            1       /* dequeue mbuf from the queue */
 134 #define ALTDQ_POLL              2       /* don't dequeue mbuf from the queue */
 135
 136 /* altq request types (currently only purge is defined) */
 137 #define ALTRQ_PURGE             1       /* purge all packets */
 138
 139 #define ALTQ_IS_READY(ifq)              ((ifq)->altq_flags & ALTQF_READY)
 140 #define ALTQ_IS_ENABLED(ifq)            ((ifq)->altq_flags & ALTQF_ENABLED)
 141 #define ALTQ_NEEDS_CLASSIFY(ifq)        ((ifq)->altq_flags & ALTQF_CLASSIFY)
 142 #define ALTQ_IS_CNDTNING(ifq)           ((ifq)->altq_flags & ALTQF_CNDTNING)
 143
 144 #define ALTQ_SET_CNDTNING(ifq)          ((ifq)->altq_flags |= ALTQF_CNDTNING)
 145 #define ALTQ_CLEAR_CNDTNING(ifq)        ((ifq)->altq_flags &= ~ALTQF_CNDTNING)
 146 #define ALTQ_IS_ATTACHED(ifq)           ((ifq)->altq_disc != NULL)
 147
 148 #define ALTQ_ENQUEUE(ifq, m, pa, err)                                   \
 149         (err) = (*(ifq)->altq_enqueue)((ifq),(m),(pa))
 150 #define ALTQ_DEQUEUE(ifq, m)                                            \
 151         (m) = (*(ifq)->altq_dequeue)((ifq), ALTDQ_REMOVE)
 152 #define ALTQ_POLL(ifq, m)                                               \
 153         (m) = (*(ifq)->altq_dequeue)((ifq), ALTDQ_POLL)
 154 #define ALTQ_PURGE(ifq)                                                 \
 155         (void)(*(ifq)->altq_request)((ifq), ALTRQ_PURGE, (void *)0)
 156 #define ALTQ_IS_EMPTY(ifq)              ((ifq)->ifq_len == 0)
 157 #define TBR_IS_ENABLED(ifq)             ((ifq)->altq_tbr != NULL)
 158
 159 extern int altq_attach(struct ifaltq *, int, void *,
 160                        int (*)(struct ifaltq *, struct mbuf *,
 161                                struct altq_pktattr *),
 162                        struct mbuf *(*)(struct ifaltq *, int),
 163                        int (*)(struct ifaltq *, int, void *),
 164                        void *,
 165                        void *(*)(void *, struct mbuf *, int));
 166 extern int altq_detach(struct ifaltq *);
 167 extern int altq_enable(struct ifaltq *);
 168 extern int altq_disable(struct ifaltq *);
 169 extern struct mbuf *tbr_dequeue(struct ifaltq *, int);
 170 extern int (*altq_input)(struct mbuf *, int);
 171 #if 1 /* ALTQ3_CLFIER_COMPAT */
 172 void altq_etherclassify(struct ifaltq *, struct mbuf *, struct altq_pktattr *);
 173 #endif
 174 #endif /* _KERNEL */
 175
 176 #endif /* _ALTQ_IF_ALTQ_H_ */