FreeBSD/Linux Kernel Cross Reference
sys/netgraph/qos.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2019 Lutz Donnerhacke <lutz@donnerhacke.de>
      *
      * 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 AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _NETGRAPH_QOS_H_
    #define _NETGRAPH_QOS_H_
    
    #include <sys/mbuf.h>
    
    /* ABI cookie */
    #define M_QOS_COOKIE            1571268051
    #define MTAG_SIZE(X)    ( sizeof(struct X) - sizeof(struct m_tag) )
    
    /*
     * Definition of types within this ABI:
     *  - Choose a type (16bit) by i.e. "echo $((1000+$(date +%s)%64536))"
     *  - Retry if the type is already in use
     *  - Define the structure for the type according to mbuf_tags(9)
     *      struct m_qos_foo {
     *          struct m_tag    tag;
     *          ...
     *      };
     * Preferred usage:
     *      struct m_qos_foo *p = (void *)m_tag_locate(m,
     *          M_QOS_COOKIE, M_QOS_FOO, ...);
     *    or
     *      p = (void *)m_tag_alloc(
     *          M_QOS_COOKIE, M_QOS_FOO, MTAG_SIZE(foo), ...);
            m_tag_prepend(m, &p->tag);
     */
    
    /* Color marking type */
    #define M_QOS_COLOR             23568
    /* Keep colors ordered semantically in order to allow use of "<=" or ">="  */
    enum qos_color {
            QOS_COLOR_GREEN,
            QOS_COLOR_YELLOW,
            QOS_COLOR_RED
    };
    struct m_qos_color {
            struct m_tag    tag;
            enum qos_color  color;
    };
    
    /*
     * Priority class
     * 
     * Processing per priority requires an overhead, which should
     * be static (i.e. for alloctating queues) and small (for memory)
     * So keep your chosen range limited.
     */
    #define M_QOS_PRIORITY          28858
    struct m_qos_priority {
            struct m_tag    tag;
            uint8_t         priority;       /* 0 - lowest */
    };
    
    #endif /* _NETGRAPH_QOS_H_ */

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