chromium / chromiumos / third_party / kernel / 11f991ff52a03cdd8ac6f2adf6c46979bba48724 / . / include / linux / tfrc.h

#ifndef _LINUX_TFRC_H_ | |

#define _LINUX_TFRC_H_ | |

/* | |

* TFRC - Data Structures for the TCP-Friendly Rate Control congestion | |

* control mechanism as specified in RFC 3448. | |

* | |

* Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. | |

* Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz> | |

* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |

* Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon | |

* | |

* This program is free software; you can redistribute it and/or modify | |

* it under the terms of the GNU General Public License as published by | |

* the Free Software Foundation; either version 2 of the License, or | |

* (at your option) any later version. | |

*/ | |

#include <linux/types.h> | |

/** tfrc_rx_info - TFRC Receiver Data Structure | |

* | |

* @tfrcrx_x_recv: receiver estimate of sending rate (3.2.2) | |

* @tfrcrx_rtt: round-trip-time (communicated by sender) | |

* @tfrcrx_p: current estimate of loss event rate (3.2.2) | |

*/ | |

struct tfrc_rx_info { | |

__u32 tfrcrx_x_recv; | |

__u32 tfrcrx_rtt; | |

__u32 tfrcrx_p; | |

}; | |

/** tfrc_tx_info - TFRC Sender Data Structure | |

* | |

* @tfrctx_x: computed transmit rate (4.3 (4)) | |

* @tfrctx_x_recv: receiver estimate of send rate (4.3) | |

* @tfrctx_x_calc: return value of throughput equation (3.1) | |

* @tfrctx_rtt: (moving average) estimate of RTT (4.3) | |

* @tfrctx_p: current loss event rate (5.4) | |

* @tfrctx_rto: estimate of RTO, equals 4*RTT (4.3) | |

* @tfrctx_ipi: inter-packet interval (4.6) | |

* | |

* Note: X and X_recv are both maintained in units of 64 * bytes/second. This | |

* enables a finer resolution of sending rates and avoids problems with | |

* integer arithmetic; u32 is not sufficient as scaling consumes 6 bits. | |

*/ | |

struct tfrc_tx_info { | |

__u64 tfrctx_x; | |

__u64 tfrctx_x_recv; | |

__u32 tfrctx_x_calc; | |

__u32 tfrctx_rtt; | |

__u32 tfrctx_p; | |

__u32 tfrctx_rto; | |

__u32 tfrctx_ipi; | |

}; | |

#endif /* _LINUX_TFRC_H_ */ |