tcp-roccet-kernel-module/tcp_roccet_struct.h

// Include Guard
#ifndef TCP_ROCCET_STRUCT
#define TCP_ROCCET_STRUCT

#include <linux/math64.h>

struct AckRate {
  u16 last_rate;
  u32 last_rate_time;
  u16 curr_rate;
  u16 cnt;
};

struct BandwidthLimitDetect {
  u32 sum_cwnd;   /* sum of cwnd during time interval */
  u32 sum_acked;  /* sum of received acks during time interval */
  u32 next_check; /* end/upper bound of time interval */
};

struct TimedRTT {
  u32 time;
  u32 rtt;
};

/* BIC TCP Parameters */
struct bictcp {
  u32 cnt;              /* increase cwnd by 1 after ACKs */
  u32 last_max_cwnd;    /* last maximum snd_cwnd */
  u32 last_cwnd;        /* the last snd_cwnd */
  u32 last_time;        /* time when updated last_cwnd */
  u32 bic_origin_point; /* origin point of bic function */
  u32 bic_K;            /* time to origin point
                           from the beginning of the current epoch */
  u32 delay_min;        /* min delay (usec) */
  u32 epoch_start;      /* beginning of an epoch */
  u32 ack_cnt;          /* number of acks */
  u32 tcp_cwnd;         /* estimated tcp cwnd */

  u32 curr_rtt; /* the minimum rtt of current round */

  // ROCCETv2 specific
  u32 roccet_last_event_time_us;      /* The last time ROCCETv2 was triggered */
  u32 curr_min_rtt;                   /* The current observed minRTT */
  struct TimedRTT curr_min_rtt_timed; /* The current observed minRTT with the
                             timestamp when it was observed */
  u32 curr_srRTT;          /* The srRTT calculated based on the latest ACK */
  struct AckRate ack_rate; /* The last and the current ACK rate */
  struct BandwidthLimitDetect bw_limit;
  u32 last_rtt; /* Used for jitter calculation */
};

#endif /* TCP_ROCCET_STRUCT */