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dscp.h

dscp.h 3.2 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. /* Copyright (c) 2024 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> */
    3. 

  3. 

  4. #ifndef __DSCP_H__
    5. 

  5. #define __DSCP_H__
    6. 

  6. 

  7. /*
    8. 

  8.  * DSCP Pools and Codepoint Space Division:
    9. 

  9.  *
    10. 

  10.  * The Differentiated Services (Diffserv) architecture defines a method for
    11. 

  11.  * classifying and managing network traffic using the DS field in IPv4 and IPv6
    12. 

  12.  * packet headers. This field can carry one of 64 distinct DSCP (Differentiated
    13. 

  13.  * Services Code Point) values, which are divided into three pools based on
    14. 

  14.  * their Least Significant Bits (LSB) patterns and intended usage. Each pool has
    15. 

  15.  * a specific registration procedure for assigning DSCP values:
    16. 

  16.  *
    17. 

  17.  * Pool 1 (Standards Action Pool):
    18. 

  18.  * - Codepoint Space: xxxxx0
    19. 

  19.  *   This pool includes DSCP values ending in '0' (binary), allocated via
    20. 

  20.  *   Standards Action. It is intended for globally recognized traffic classes,
    21. 

  21.  *   ensuring interoperability across the internet. This pool encompasses
    22. 

  22.  *   well-known DSCP values such as CS0-CS7, AFxx, EF, and VOICE-ADMIT.
    23. 

  23.  *
    24. 

  24.  * Pool 2 (Experimental/Local Use Pool):
    25. 

  25.  * - Codepoint Space: xxxx11
    26. 

  26.  *   Reserved for DSCP values ending in '11' (binary), this pool is designated
    27. 

  27.  *   for Experimental or Local Use. It allows for private or temporary traffic
    28. 

  28.  *   marking schemes not intended for standardized global use, facilitating
    29. 

  29.  *   testing and network-specific configurations without impacting
    30. 

  30.  *   interoperability.
    31. 

  31.  *
    32. 

  32.  * Pool 3 (Preferential Standardization Pool):
    33. 

  33.  * - Codepoint Space: xxxx01
    34. 

  34.  *   Initially reserved for experimental or local use, this pool now serves as
    35. 

  35.  *   a secondary standardization resource should Pool 1 become exhausted. DSCP
    36. 

  36.  *   values ending in '01' (binary) are assigned via Standards Action, with a
    37. 

  37.  *   focus on adopting new, standardized traffic classes as the need arises.
    38. 

  38.  *
    39. 

  39.  * For pool updates see:
    40. 

  40.  * https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml
    41. 

  41.  */
    42. 

  42. 

  43. /* Pool 1: Standardized DSCP values as per [RFC8126] */
    44. 

  44. #define DSCP_CS0 0		/* 000000, [RFC2474] */
    45. 

  45. /* CS0 is some times called default (DF) */
    46. 

  46. #define DSCP_DF 0		/* 000000, [RFC2474] */
    47. 

  47. #define DSCP_CS1 8		/* 001000, [RFC2474] */
    48. 

  48. #define DSCP_CS2 16		/* 010000, [RFC2474] */
    49. 

  49. #define DSCP_CS3 24		/* 011000, [RFC2474] */
    50. 

  50. #define DSCP_CS4 32		/* 100000, [RFC2474] */
    51. 

  51. #define DSCP_CS5 40		/* 101000, [RFC2474] */
    52. 

  52. #define DSCP_CS6 48		/* 110000, [RFC2474] */
    53. 

  53. #define DSCP_CS7 56		/* 111000, [RFC2474] */
    54. 

  54. #define DSCP_AF11 10		/* 001010, [RFC2597] */
    55. 

  55. #define DSCP_AF12 12		/* 001100, [RFC2597] */
    56. 

  56. #define DSCP_AF13 14		/* 001110, [RFC2597] */
    57. 

  57. #define DSCP_AF21 18		/* 010010, [RFC2597] */
    58. 

  58. #define DSCP_AF22 20		/* 010100, [RFC2597] */
    59. 

  59. #define DSCP_AF23 22		/* 010110, [RFC2597] */
    60. 

  60. #define DSCP_AF31 26		/* 011010, [RFC2597] */
    61. 

  61. #define DSCP_AF32 28		/* 011100, [RFC2597] */
    62. 

  62. #define DSCP_AF33 30		/* 011110, [RFC2597] */
    63. 

  63. #define DSCP_AF41 34		/* 100010, [RFC2597] */
    64. 

  64. #define DSCP_AF42 36		/* 100100, [RFC2597] */
    65. 

  65. #define DSCP_AF43 38		/* 100110, [RFC2597] */
    66. 

  66. #define DSCP_EF 46		/* 101110, [RFC3246] */
    67. 

  67. #define DSCP_VOICE_ADMIT 44	/* 101100, [RFC5865] */
    68. 

  68. 

  69. /* Pool 3: Standardized assignments, previously available for experimental/local
    70. 

  70.  * use
    71. 

  71.  */
    72. 

  72. #define DSCP_LE 1		/* 000001, [RFC8622] */
    73. 

  73. 

  74. #define DSCP_MAX 64
    75. 

  75. 

  76. #endif /* __DSCP_H__ */
    77.