FreeBSD/Linux Kernel Cross Reference
sys/net/altq/altq_fairq.h

     /*
      * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
      * 
      * This code is derived from software contributed to The DragonFly Project
      * by Matthew Dillon <dillon@backplane.com>
      * 
      * 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.
     * 3. Neither the name of The DragonFly Project nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific, prior written permission.
     * 
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE
     * COPYRIGHT HOLDERS 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.
     * 
     * $DragonFly: src/sys/net/altq/altq_fairq.h,v 1.1 2008/04/06 18:58:15 dillon Exp $
     * $FreeBSD$
     */
    
    #ifndef _ALTQ_ALTQ_FAIRQ_H_
    #define _ALTQ_ALTQ_FAIRQ_H_
    
    #include <net/altq/altq.h>
    #include <net/altq/altq_classq.h>
    #include <net/altq/altq_codel.h>
    #include <net/altq/altq_red.h>
    #include <net/altq/altq_rio.h>
    #include <net/altq/altq_rmclass.h>
    
    #define FAIRQ_MAX_BUCKETS       2048    /* maximum number of sorting buckets */
    #define FAIRQ_MAXPRI            RM_MAXPRIO
    #define FAIRQ_BITMAP_WIDTH      (sizeof(fairq_bitmap_t)*8)
    #define FAIRQ_BITMAP_MASK       (FAIRQ_BITMAP_WIDTH - 1)
    
    /* fairq class flags */
    #define FARF_RED                0x0001  /* use RED */
    #define FARF_ECN                0x0002  /* use RED/ECN */
    #define FARF_RIO                0x0004  /* use RIO */
    #define FARF_CODEL              0x0008  /* use CoDel */
    #define FARF_CLEARDSCP          0x0010  /* clear diffserv codepoint */
    #define FARF_DEFAULTCLASS       0x1000  /* default class */
    
    #define FARF_HAS_PACKETS        0x2000  /* might have queued packets */
    
    #define FARF_USERFLAGS          (FARF_RED|FARF_ECN|FARF_RIO|FARF_CLEARDSCP| \
                                     FARF_DEFAULTCLASS)
    
    /* special class handles */
    #define FAIRQ_NULLCLASS_HANDLE  0
    
    typedef u_int   fairq_bitmap_t;
    
    struct fairq_classstats {
            uint32_t                class_handle;
    
            u_int                   qlength;
            u_int                   qlimit;
            struct pktcntr          xmit_cnt;  /* transmitted packet counter */
            struct pktcntr          drop_cnt;  /* dropped packet counter */
    
            /* codel, red and rio related info */
            int                     qtype;
            struct redstats         red[3]; /* rio has 3 red stats */
            struct codel_stats      codel;
    };
    
    /*
     * FAIRQ_STATS_VERSION is defined in altq.h to work around issues stemming
     * from mixing of public-API and internal bits in each scheduler-specific
     * header.
     */
    
    #ifdef _KERNEL
    
    typedef struct fairq_bucket {
            struct fairq_bucket *next;      /* circular list */
            struct fairq_bucket *prev;      /* circular list */
            class_queue_t   queue;          /* the actual queue */
            uint64_t        bw_bytes;       /* statistics used to calculate bw */
            uint64_t        bw_delta;       /* statistics used to calculate bw */
            uint64_t        last_time;
           int             in_use;
   } fairq_bucket_t;
   
   struct fairq_class {
           uint32_t        cl_handle;      /* class handle */
           u_int           cl_nbuckets;    /* (power of 2) */
           u_int           cl_nbucket_mask; /* bucket mask */
           fairq_bucket_t  *cl_buckets;
           fairq_bucket_t  *cl_head;       /* head of circular bucket list */
           fairq_bucket_t  *cl_polled;
           union {
                   struct red      *cl_red;        /* RED state */
                   struct codel    *cl_codel;      /* CoDel state */
           } cl_aqm;
   #define cl_red          cl_aqm.cl_red
   #define cl_codel        cl_aqm.cl_codel
           u_int           cl_hogs_m1;
           u_int           cl_lssc_m1;
           u_int           cl_bandwidth;
           uint64_t        cl_bw_bytes;
           uint64_t        cl_bw_delta;
           uint64_t        cl_last_time;
           int             cl_qtype;       /* rollup */
           int             cl_qlimit;
           int             cl_pri;         /* priority */
           int             cl_flags;       /* class flags */
           struct fairq_if *cl_pif;        /* back pointer to pif */
           struct altq_pktattr *cl_pktattr; /* saved header used by ECN */
   
           /* round robin index */
   
           /* statistics */
           struct pktcntr  cl_xmitcnt;     /* transmitted packet counter */
           struct pktcntr  cl_dropcnt;     /* dropped packet counter */
   };
   
   /*
    * fairq interface state
    */
   struct fairq_if {
           struct fairq_if         *pif_next;      /* interface state list */
           struct ifaltq           *pif_ifq;       /* backpointer to ifaltq */
           u_int                   pif_bandwidth;  /* link bandwidth in bps */
           int                     pif_maxpri;     /* max priority in use */
           struct fairq_class      *pif_poll_cache;/* cached poll */
           struct fairq_class      *pif_default;   /* default class */
           struct fairq_class      *pif_classes[FAIRQ_MAXPRI]; /* classes */
   };
   
   #endif /* _KERNEL */
   
   #endif /* _ALTQ_ALTQ_FAIRQ_H_ */

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