tfrc.h 1.9 KB

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  1. #ifndef _LINUX_TFRC_H_
  2. #define _LINUX_TFRC_H_
  3. /*
  4. * TFRC - Data Structures for the TCP-Friendly Rate Control congestion
  5. * control mechanism as specified in RFC 3448.
  6. *
  7. * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
  8. * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
  9. * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  10. * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
  11. *
  12. * This program is free software; you can redistribute it and/or modify
  13. * it under the terms of the GNU General Public License as published by
  14. * the Free Software Foundation; either version 2 of the License, or
  15. * (at your option) any later version.
  16. */
  17. #include <linux/types.h>
  18. /** tfrc_rx_info - TFRC Receiver Data Structure
  19. *
  20. * @tfrcrx_x_recv: receiver estimate of sending rate (3.2.2)
  21. * @tfrcrx_rtt: round-trip-time (communicated by sender)
  22. * @tfrcrx_p: current estimate of loss event rate (3.2.2)
  23. */
  24. struct tfrc_rx_info {
  25. __u32 tfrcrx_x_recv;
  26. __u32 tfrcrx_rtt;
  27. __u32 tfrcrx_p;
  28. };
  29. /** tfrc_tx_info - TFRC Sender Data Structure
  30. *
  31. * @tfrctx_x: computed transmit rate (4.3 (4))
  32. * @tfrctx_x_recv: receiver estimate of send rate (4.3)
  33. * @tfrctx_x_calc: return value of throughput equation (3.1)
  34. * @tfrctx_rtt: (moving average) estimate of RTT (4.3)
  35. * @tfrctx_p: current loss event rate (5.4)
  36. * @tfrctx_rto: estimate of RTO, equals 4*RTT (4.3)
  37. * @tfrctx_ipi: inter-packet interval (4.6)
  38. *
  39. * Note: X and X_recv are both maintained in units of 64 * bytes/second. This
  40. * enables a finer resolution of sending rates and avoids problems with
  41. * integer arithmetic; u32 is not sufficient as scaling consumes 6 bits.
  42. */
  43. struct tfrc_tx_info {
  44. __u64 tfrctx_x;
  45. __u64 tfrctx_x_recv;
  46. __u32 tfrctx_x_calc;
  47. __u32 tfrctx_rtt;
  48. __u32 tfrctx_p;
  49. __u32 tfrctx_rto;
  50. __u32 tfrctx_ipi;
  51. };
  52. #endif /* _LINUX_TFRC_H_ */