FreeBSD/Linux Kernel Cross Reference
sys/altq/altq_hfsc.h

     /*      $NetBSD: altq_hfsc.h,v 1.6 2005/02/26 23:04:16 perry Exp $      */
     /*      $KAME: altq_hfsc.h,v 1.6 2000/12/14 08:12:46 thorpej Exp $      */
     
     /*
      * Copyright (c) 1997-1999 Carnegie Mellon University. All Rights Reserved.
      *
      * Permission to use, copy, modify, and distribute this software and
      * its documentation is hereby granted (including for commercial or
      * for-profit use), provided that both the copyright notice and this
     * permission notice appear in all copies of the software, derivative
     * works, or modified versions, and any portions thereof, and that
     * both notices appear in supporting documentation, and that credit
     * is given to Carnegie Mellon University in all publications reporting
     * on direct or indirect use of this code or its derivatives.
     *
     * THIS SOFTWARE IS EXPERIMENTAL AND IS KNOWN TO HAVE BUGS, SOME OF
     * WHICH MAY HAVE SERIOUS CONSEQUENCES.  CARNEGIE MELLON PROVIDES THIS
     * SOFTWARE IN ITS ``AS IS'' CONDITION, 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 CARNEGIE MELLON UNIVERSITY 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.
     *
     * Carnegie Mellon encourages (but does not require) users of this
     * software to return any improvements or extensions that they make,
     * and to grant Carnegie Mellon the rights to redistribute these
     * changes without encumbrance.
     */
    #ifndef _ALTQ_ALTQ_HFSC_H_
    #define _ALTQ_ALTQ_HFSC_H_
    
    #include <altq/altq.h>
    #include <altq/altq_classq.h>
    #include <altq/altq_red.h>
    #include <altq/altq_rio.h>
    
    #ifdef __cplusplus
    extern "C" {
    #endif
    
    struct hfsc_interface {
            char    hfsc_ifname[IFNAMSIZ];  /* interface name (e.g., fxp0) */
    };
    
    struct hfsc_attach {
            struct hfsc_interface   iface;
            u_int                   bandwidth;  /* link bandwidth in bits/sec */
    };
    
    struct service_curve {
            u_int   m1;     /* slope of the first segment in bits/sec */
            u_int   d;      /* the x-projection of the first segment in msec */
            u_int   m2;     /* slope of the second segment in bits/sec */
    };
    
    struct hfsc_add_class {
            struct hfsc_interface   iface;
            u_long                  parent_handle;
            struct service_curve    service_curve;
            int                     qlimit;
            int                     flags;
    
            u_long                  class_handle;  /* return value */
    };
    
    /* special class handles */
    #define HFSC_ROOTCLASS_HANDLE   0
    #define HFSC_NULLCLASS_HANDLE   0
    
    /* hfsc class flags */
    #define HFCF_RED                0x0001  /* use RED */
    #define HFCF_ECN                0x0002  /* use RED/ECN */
    #define HFCF_RIO                0x0004  /* use RIO */
    #define HFCF_CLEARDSCP          0x0010  /* clear diffserv codepoint */
    #define HFCF_DEFAULTCLASS       0x1000  /* default class */
    
    struct hfsc_delete_class {
            struct hfsc_interface   iface;
            u_long                  class_handle;
    };
    
    /* service curve types */
    #define HFSC_REALTIMESC         1
    #define HFSC_LINKSHARINGSC      2
    #define HFSC_DEFAULTSC          (HFSC_REALTIMESC|HFSC_LINKSHARINGSC)
    
    struct hfsc_modify_class {
            struct hfsc_interface   iface;
            u_long                  class_handle;
            struct service_curve    service_curve;
            int                     sctype;
    };
   
   struct hfsc_add_filter {
           struct hfsc_interface   iface;
           u_long                  class_handle;
           struct flow_filter      filter;
   
           u_long                  filter_handle;  /* return value */
   };
   
   struct hfsc_delete_filter {
           struct hfsc_interface   iface;
           u_long                  filter_handle;
   };
   
   struct hfsc_basic_class_stats {
           u_int                   class_id;
           u_long                  class_handle;
           struct service_curve    rsc;
           struct service_curve    fsc;
   
           u_int64_t               total;  /* total work in bytes */
           u_int64_t               cumul;  /* cumulative work in bytes
                                              done by real-time criteria */
           u_int64_t               d;              /* deadline */
           u_int64_t               e;              /* eligible time */
           u_int64_t               vt;             /* virtual time */
   
           u_int                   qlength;
           struct pktcntr          xmit_cnt;
           struct pktcntr          drop_cnt;
           u_int                   period;
   
           /* red and rio related info */
           int             qtype;
           struct redstats red[3];
   };
   
   struct hfsc_class_stats {
           struct hfsc_interface   iface;
           int                     nskip;          /* skip # of classes */
           int                     nclasses;       /* # of class stats (WR) */
           u_int64_t               cur_time;       /* current time */
           u_int                   hif_classes;    /* # of classes in the tree */
           u_int                   hif_packets;    /* # of packets in the tree */
           struct hfsc_basic_class_stats   *stats; /* pointer to stats array */
   };
   
   #define HFSC_IF_ATTACH          _IOW('Q', 1, struct hfsc_attach)
   #define HFSC_IF_DETACH          _IOW('Q', 2, struct hfsc_interface)
   #define HFSC_ENABLE             _IOW('Q', 3, struct hfsc_interface)
   #define HFSC_DISABLE            _IOW('Q', 4, struct hfsc_interface)
   #define HFSC_CLEAR_HIERARCHY    _IOW('Q', 5, struct hfsc_interface)
   #define HFSC_ADD_CLASS          _IOWR('Q', 7, struct hfsc_add_class)
   #define HFSC_DEL_CLASS          _IOW('Q', 8, struct hfsc_delete_class)
   #define HFSC_MOD_CLASS          _IOW('Q', 9, struct hfsc_modify_class)
   #define HFSC_ADD_FILTER         _IOWR('Q', 10, struct hfsc_add_filter)
   #define HFSC_DEL_FILTER         _IOW('Q', 11, struct hfsc_delete_filter)
   #define HFSC_GETSTATS           _IOWR('Q', 12, struct hfsc_class_stats)
   
   #ifdef _KERNEL
   /*
    * kernel internal service curve representation
    *      coordinates are given by 64 bit unsigned integers.
    *      x-axis: unit is clock count.  for the intel x86 architecture,
    *              the raw Pentium TSC (Timestamp Counter) value is used.
    *              virtual time is also calculated in this time scale.
    *      y-axis: unit is byte.
    *
    *      the service curve parameters are converted to the internal
    *      representation.
    *      the slope values are scaled to avoid overflow.
    *      the inverse slope values as well as the y-projection of the 1st
    *      segment are kept in order to to avoid 64-bit divide operations
    *      that are expensive on 32-bit architectures.
    *
    *  note: Intel Pentium TSC never wraps around in several thousands of years.
    *      x-axis doesn't wrap around for 1089 years with 1GHz clock.
    *      y-axis doesn't wrap around for 4358 years with 1Gbps bandwidth.
    */
   
   /* kernel internal representation of a service curve */
   struct internal_sc {
           u_int64_t       sm1;    /* scaled slope of the 1st segment */
           u_int64_t       ism1;   /* scaled inverse-slope of the 1st segment */
           u_int64_t       dx;     /* the x-projection of the 1st segment */
           u_int64_t       dy;     /* the y-projection of the 1st segment */
           u_int64_t       sm2;    /* scaled slope of the 2nd segment */
           u_int64_t       ism2;   /* scaled inverse-slope of the 2nd segment */
   };
   
   /* runtime service curve */
   struct runtime_sc {
           u_int64_t       x;      /* current starting position on x-axis */
           u_int64_t       y;      /* current starting position on x-axis */
           u_int64_t       sm1;    /* scaled slope of the 1st segment */
           u_int64_t       ism1;   /* scaled inverse-slope of the 1st segment */
           u_int64_t       dx;     /* the x-projection of the 1st segment */
           u_int64_t       dy;     /* the y-projection of the 1st segment */
           u_int64_t       sm2;    /* scaled slope of the 2nd segment */
           u_int64_t       ism2;   /* scaled inverse-slope of the 2nd segment */
   };
   
   /* for TAILQ based ellist and actlist implementation */
   struct hfsc_class;
   typedef TAILQ_HEAD(_eligible, hfsc_class) ellist_t;
   typedef TAILQ_ENTRY(hfsc_class) elentry_t;
   typedef TAILQ_HEAD(_active, hfsc_class) actlist_t;
   typedef TAILQ_ENTRY(hfsc_class) actentry_t;
   #define ellist_first(s)         TAILQ_FIRST(s)
   #define actlist_first(s)        TAILQ_FIRST(s)
   #define actlist_last(s)         TAILQ_LAST(s, _active)
   
   struct hfsc_class {
           u_int           cl_id;          /* class id (just for debug) */
           u_long          cl_handle;      /* class handle */
           struct hfsc_if  *cl_hif;        /* back pointer to struct hfsc_if */
           int             cl_flags;       /* misc flags */
   
           struct hfsc_class *cl_parent;   /* parent class */
           struct hfsc_class *cl_siblings; /* sibling classes */
           struct hfsc_class *cl_children; /* child classes */
   
           class_queue_t   *cl_q;          /* class queue structure */
           struct red      *cl_red;        /* RED state */
           struct altq_pktattr *cl_pktattr; /* saved header used by ECN */
   
           u_int64_t       cl_total;       /* total work in bytes */
           u_int64_t       cl_cumul;       /* cumulative work in bytes
                                              done by real-time criteria */
           u_int64_t       cl_d;           /* deadline */
           u_int64_t       cl_e;           /* eligible time */
           u_int64_t       cl_vt;          /* virtual time */
   
           struct internal_sc *cl_rsc;     /* internal real-time service curve */
           struct internal_sc *cl_fsc;     /* internal fair service curve */
           struct runtime_sc  cl_deadline; /* deadline curve */
           struct runtime_sc  cl_eligible; /* eligible curve */
           struct runtime_sc  cl_virtual;  /* virtual curve */
   
           u_int           cl_vtperiod;    /* vt period sequence no */
           u_int           cl_parentperiod;  /* parent's vt period seqno */
           int             cl_nactive;     /* number of active children */
           actlist_t       *cl_actc;       /* active children list */
   
           actentry_t      cl_actlist;     /* active children list entry */
           elentry_t       cl_ellist;      /* eligible list entry */
   
           struct {
                   struct pktcntr  xmit_cnt;
                   struct pktcntr  drop_cnt;
                   u_int period;
           } cl_stats;
   };
   
   /*
    * hfsc interface state
    */
   struct hfsc_if {
           struct hfsc_if          *hif_next;      /* interface state list */
           struct ifaltq           *hif_ifq;       /* backpointer to ifaltq */
           struct hfsc_class       *hif_rootclass;         /* root class */
           struct hfsc_class       *hif_defaultclass;      /* default class */
           struct hfsc_class       *hif_pollcache; /* cache for poll operation */
   
           u_int   hif_classes;                    /* # of classes in the tree */
           u_int   hif_packets;                    /* # of packets in the tree */
           u_int   hif_classid;                    /* class id sequence number */
   
           ellist_t *hif_eligible;                 /* eligible list */
   
           struct acc_classifier   hif_classifier;
   };
   
   #endif /* _KERNEL */
   
   #ifdef __cplusplus
   }
   #endif
   
   #endif /* _ALTQ_ALTQ_HFSC_H_ */

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