/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2024 Pengutronix, Oleksij Rempel <[email protected]> */
#ifndef __DSCP_H__
#define __DSCP_H__
/*
* DSCP Pools and Codepoint Space Division:
*
* The Differentiated Services (Diffserv) architecture defines a method for
* classifying and managing network traffic using the DS field in IPv4 and IPv6
* packet headers. This field can carry one of 64 distinct DSCP (Differentiated
* Services Code Point) values, which are divided into three pools based on
* their Least Significant Bits (LSB) patterns and intended usage. Each pool has
* a specific registration procedure for assigning DSCP values:
*
* Pool 1 (Standards Action Pool):
* - Codepoint Space: xxxxx0
* This pool includes DSCP values ending in '0' (binary), allocated via
* Standards Action. It is intended for globally recognized traffic classes,
* ensuring interoperability across the internet. This pool encompasses
* well-known DSCP values such as CS0-CS7, AFxx, EF, and VOICE-ADMIT.
*
* Pool 2 (Experimental/Local Use Pool):
* - Codepoint Space: xxxx11
* Reserved for DSCP values ending in '11' (binary), this pool is designated
* for Experimental or Local Use. It allows for private or temporary traffic
* marking schemes not intended for standardized global use, facilitating
* testing and network-specific configurations without impacting
* interoperability.
*
* Pool 3 (Preferential Standardization Pool):
* - Codepoint Space: xxxx01
* Initially reserved for experimental or local use, this pool now serves as
* a secondary standardization resource should Pool 1 become exhausted. DSCP
* values ending in '01' (binary) are assigned via Standards Action, with a
* focus on adopting new, standardized traffic classes as the need arises.
*
* For pool updates see:
* https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml
*/
/* Pool 1: Standardized DSCP values as per [RFC8126] */
#define DSCP_CS0 0 /* 000000, [RFC2474] */
/* CS0 is some times called default (DF) */
#define DSCP_DF 0 /* 000000, [RFC2474] */
#define DSCP_CS1 8 /* 001000, [RFC2474] */
#define DSCP_CS2 16 /* 010000, [RFC2474] */
#define DSCP_CS3 24 /* 011000, [RFC2474] */
#define DSCP_CS4 32 /* 100000, [RFC2474] */
#define DSCP_CS5 40 /* 101000, [RFC2474] */
#define DSCP_CS6 48 /* 110000, [RFC2474] */
#define DSCP_CS7 56 /* 111000, [RFC2474] */
#define DSCP_AF11 10 /* 001010, [RFC2597] */
#define DSCP_AF12 12 /* 001100, [RFC2597] */
#define DSCP_AF13 14 /* 001110, [RFC2597] */
#define DSCP_AF21 18 /* 010010, [RFC2597] */
#define DSCP_AF22 20 /* 010100, [RFC2597] */
#define DSCP_AF23 22 /* 010110, [RFC2597] */
#define DSCP_AF31 26 /* 011010, [RFC2597] */
#define DSCP_AF32 28 /* 011100, [RFC2597] */
#define DSCP_AF33 30 /* 011110, [RFC2597] */
#define DSCP_AF41 34 /* 100010, [RFC2597] */
#define DSCP_AF42 36 /* 100100, [RFC2597] */
#define DSCP_AF43 38 /* 100110, [RFC2597] */
#define DSCP_EF 46 /* 101110, [RFC3246] */
#define DSCP_VOICE_ADMIT 44 /* 101100, [RFC5865] */
/* Pool 3: Standardized assignments, previously available for experimental/local
* use
*/
#define DSCP_LE 1 /* 000001, [RFC8622] */
#define DSCP_MAX 64
#endif /* __DSCP_H__ */
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