60 static inline void bictcp_reset(struct bictcp *ca)  in bictcp_reset()  argument
62 	ca->cnt = 0;  in bictcp_reset()
63 	ca->last_max_cwnd = 0;  in bictcp_reset()
64 	ca->last_cwnd = 0;  in bictcp_reset()
65 	ca->last_time = 0;  in bictcp_reset()
66 	ca->epoch_start = 0;  in bictcp_reset()
67 	ca->delayed_ack = 2 << ACK_RATIO_SHIFT;  in bictcp_reset()
72 	struct bictcp *ca = inet_csk_ca(sk);  in bictcp_init()  local
74 	bictcp_reset(ca);  in bictcp_init()
75 	ca->loss_cwnd = 0;  in bictcp_init()
84 static inline void bictcp_update(struct bictcp *ca, u32 cwnd)  in bictcp_update()  argument
86 	if (ca->last_cwnd == cwnd &&  in bictcp_update()
87 	    (s32)(tcp_time_stamp - ca->last_time) <= HZ / 32)  in bictcp_update()
90 	ca->last_cwnd = cwnd;  in bictcp_update()
91 	ca->last_time = tcp_time_stamp;  in bictcp_update()
93 	if (ca->epoch_start == 0) /* record the beginning of an epoch */  in bictcp_update()
94 		ca->epoch_start = tcp_time_stamp;  in bictcp_update()
98 		ca->cnt = cwnd;  in bictcp_update()
103 	if (cwnd < ca->last_max_cwnd) {  in bictcp_update()
104 		__u32	dist = (ca->last_max_cwnd - cwnd)  in bictcp_update()
109 			ca->cnt = cwnd / max_increment;  in bictcp_update()
112 			ca->cnt = (cwnd * smooth_part) / BICTCP_B;  in bictcp_update()
115 			ca->cnt = cwnd / dist;  in bictcp_update()
118 		if (cwnd < ca->last_max_cwnd + BICTCP_B)  in bictcp_update()
120 			ca->cnt = (cwnd * smooth_part) / BICTCP_B;  in bictcp_update()
121 		else if (cwnd < ca->last_max_cwnd + max_increment*(BICTCP_B-1))  in bictcp_update()
123 			ca->cnt = (cwnd * (BICTCP_B-1))  in bictcp_update()
124 				/ (cwnd - ca->last_max_cwnd);  in bictcp_update()
127 			ca->cnt = cwnd / max_increment;  in bictcp_update()
131 	if (ca->last_max_cwnd == 0) {  in bictcp_update()
132 		if (ca->cnt > 20) /* increase cwnd 5% per RTT */  in bictcp_update()
133 			ca->cnt = 20;  in bictcp_update()
136 	ca->cnt = (ca->cnt << ACK_RATIO_SHIFT) / ca->delayed_ack;  in bictcp_update()
137 	if (ca->cnt == 0)			/* cannot be zero */  in bictcp_update()
138 		ca->cnt = 1;  in bictcp_update()
144 	struct bictcp *ca = inet_csk_ca(sk);  in bictcp_cong_avoid()  local
152 		bictcp_update(ca, tp->snd_cwnd);  in bictcp_cong_avoid()
153 		tcp_cong_avoid_ai(tp, ca->cnt, 1);  in bictcp_cong_avoid()
164 	struct bictcp *ca = inet_csk_ca(sk);  in bictcp_recalc_ssthresh()  local
166 	ca->epoch_start = 0;	/* end of epoch */  in bictcp_recalc_ssthresh()
169 	if (tp->snd_cwnd < ca->last_max_cwnd && fast_convergence)  in bictcp_recalc_ssthresh()
170 		ca->last_max_cwnd = (tp->snd_cwnd * (BICTCP_BETA_SCALE + beta))  in bictcp_recalc_ssthresh()
173 		ca->last_max_cwnd = tp->snd_cwnd;  in bictcp_recalc_ssthresh()
175 	ca->loss_cwnd = tp->snd_cwnd;  in bictcp_recalc_ssthresh()
186 	const struct bictcp *ca = inet_csk_ca(sk);  in bictcp_undo_cwnd()  local
188 	return max(tp->snd_cwnd, ca->loss_cwnd);  in bictcp_undo_cwnd()
205 		struct bictcp *ca = inet_csk_ca(sk);  in bictcp_acked()  local
207 		cnt -= ca->delayed_ack >> ACK_RATIO_SHIFT;  in bictcp_acked()
208 		ca->delayed_ack += cnt;  in bictcp_acked()