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IEEE 802.1q specification provides recommendation and examples which can be used as good default values for different drivers. This patch implements mapping examples documented in IEEE 802.1Q-2022 in Annex I "I.3 Traffic type to traffic class mapping" and IETF DSCP naming and mapping DSCP to Traffic Type inspired by RFC8325. This helpers will be used in followup patches for dsa/microchip DCB implementation. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
76 lines
3.2 KiB
C
76 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2024 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> */
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#ifndef __DSCP_H__
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#define __DSCP_H__
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/*
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* DSCP Pools and Codepoint Space Division:
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*
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* The Differentiated Services (Diffserv) architecture defines a method for
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* classifying and managing network traffic using the DS field in IPv4 and IPv6
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* packet headers. This field can carry one of 64 distinct DSCP (Differentiated
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* Services Code Point) values, which are divided into three pools based on
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* their Least Significant Bits (LSB) patterns and intended usage. Each pool has
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* a specific registration procedure for assigning DSCP values:
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*
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* Pool 1 (Standards Action Pool):
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* - Codepoint Space: xxxxx0
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* This pool includes DSCP values ending in '0' (binary), allocated via
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* Standards Action. It is intended for globally recognized traffic classes,
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* ensuring interoperability across the internet. This pool encompasses
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* well-known DSCP values such as CS0-CS7, AFxx, EF, and VOICE-ADMIT.
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*
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* Pool 2 (Experimental/Local Use Pool):
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* - Codepoint Space: xxxx11
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* Reserved for DSCP values ending in '11' (binary), this pool is designated
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* for Experimental or Local Use. It allows for private or temporary traffic
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* marking schemes not intended for standardized global use, facilitating
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* testing and network-specific configurations without impacting
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* interoperability.
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*
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* Pool 3 (Preferential Standardization Pool):
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* - Codepoint Space: xxxx01
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* Initially reserved for experimental or local use, this pool now serves as
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* a secondary standardization resource should Pool 1 become exhausted. DSCP
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* values ending in '01' (binary) are assigned via Standards Action, with a
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* focus on adopting new, standardized traffic classes as the need arises.
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*
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* For pool updates see:
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* https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml
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*/
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/* Pool 1: Standardized DSCP values as per [RFC8126] */
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#define DSCP_CS0 0 /* 000000, [RFC2474] */
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/* CS0 is some times called default (DF) */
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#define DSCP_DF 0 /* 000000, [RFC2474] */
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#define DSCP_CS1 8 /* 001000, [RFC2474] */
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#define DSCP_CS2 16 /* 010000, [RFC2474] */
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#define DSCP_CS3 24 /* 011000, [RFC2474] */
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#define DSCP_CS4 32 /* 100000, [RFC2474] */
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#define DSCP_CS5 40 /* 101000, [RFC2474] */
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#define DSCP_CS6 48 /* 110000, [RFC2474] */
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#define DSCP_CS7 56 /* 111000, [RFC2474] */
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#define DSCP_AF11 10 /* 001010, [RFC2597] */
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#define DSCP_AF12 12 /* 001100, [RFC2597] */
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#define DSCP_AF13 14 /* 001110, [RFC2597] */
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#define DSCP_AF21 18 /* 010010, [RFC2597] */
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#define DSCP_AF22 20 /* 010100, [RFC2597] */
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#define DSCP_AF23 22 /* 010110, [RFC2597] */
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#define DSCP_AF31 26 /* 011010, [RFC2597] */
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#define DSCP_AF32 28 /* 011100, [RFC2597] */
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#define DSCP_AF33 30 /* 011110, [RFC2597] */
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#define DSCP_AF41 34 /* 100010, [RFC2597] */
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#define DSCP_AF42 36 /* 100100, [RFC2597] */
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#define DSCP_AF43 38 /* 100110, [RFC2597] */
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#define DSCP_EF 46 /* 101110, [RFC3246] */
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#define DSCP_VOICE_ADMIT 44 /* 101100, [RFC5865] */
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/* Pool 3: Standardized assignments, previously available for experimental/local
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* use
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*/
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#define DSCP_LE 1 /* 000001, [RFC8622] */
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#define DSCP_MAX 64
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#endif /* __DSCP_H__ */
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