57 static u32 cube_rtt_scale __read_mostly;
58 static u32 beta_scale __read_mostly;
84 	u32	cnt;		/* increase cwnd by 1 after ACKs */
85 	u32 	last_max_cwnd;	/* last maximum snd_cwnd */
86 	u32	loss_cwnd;	/* congestion window at last loss */
87 	u32	last_cwnd;	/* the last snd_cwnd */
88 	u32	last_time;	/* time when updated last_cwnd */
89 	u32	bic_origin_point;/* origin point of bic function */
90 	u32	bic_K;		/* time to origin point from the beginning of the current epoch */
91 	u32	delay_min;	/* min delay (msec << 3) */
92 	u32	epoch_start;	/* beginning of an epoch */
93 	u32	ack_cnt;	/* number of acks */
94 	u32	tcp_cwnd;	/* estimated tcp cwnd */
100 	u32	round_start;	/* beginning of each round */
101 	u32	end_seq;	/* end_seq of the round */
102 	u32	last_ack;	/* last time when the ACK spacing is close */
103 	u32	curr_rtt;	/* the minimum rtt of current round */
122 static inline u32 bictcp_clock(void)  in bictcp_clock()
160 static u32 cubic_root(u64 a)  in cubic_root()
162 	u32 x, b, shift;  in cubic_root()
185 		return ((u32)v[(u32)a] + 35) >> 6;  in cubic_root()
191 	x = ((u32)(((u32)v[shift] + 10) << b)) >> 6;  in cubic_root()
199 	x = (2 * x + (u32)div64_u64(a, (u64)x * (u64)(x - 1)));  in cubic_root()
207 static inline void bictcp_update(struct bictcp *ca, u32 cwnd)  in bictcp_update()
210 	u32 delta, t, bic_target, max_cnt;  in bictcp_update()
285 		u32 scale = beta_scale;  in bictcp_update()
305 static void bictcp_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)  in bictcp_cong_avoid()
324 static u32 bictcp_recalc_ssthresh(struct sock *sk)  in bictcp_recalc_ssthresh()
343 static u32 bictcp_undo_cwnd(struct sock *sk)  in bictcp_undo_cwnd()
358 static void hystart_update(struct sock *sk, u32 delay)  in hystart_update()
364 		u32 now = bictcp_clock();  in hystart_update()
396 static void bictcp_acked(struct sock *sk, u32 cnt, s32 rtt_us)  in bictcp_acked()
401 	u32 delay;  in bictcp_acked()
404 		u32 ratio = ca->delayed_ack;  in bictcp_acked()