Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Binary Increase Congestion control for TCP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Home page:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *      http://netsrv.csc.ncsu.edu/twiki/bin/view/Main/BIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * This is from the implementation of BICTCP in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Lison-Xu, Kahaled Harfoush, and Injong Rhee.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  "Binary Increase Congestion Control for Fast, Long Distance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *  Networks" in InfoComm 2004
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * Available from:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *  http://netsrv.csc.ncsu.edu/export/bitcp.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * Unless BIC is enabled and congestion window is large
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * this behaves the same as the original Reno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define BICTCP_BETA_SCALE    1024	/* Scale factor beta calculation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 					 * max_cwnd = snd_cwnd * beta
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 					 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define BICTCP_B		4	 /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 					  * In binary search,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 					  * go to point (max+min)/N
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 					  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static int fast_convergence = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static int max_increment = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static int low_window = 14;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static int beta = 819;		/* = 819/1024 (BICTCP_BETA_SCALE) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static int initial_ssthresh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static int smooth_part = 20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) module_param(fast_convergence, int, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) MODULE_PARM_DESC(fast_convergence, "turn on/off fast convergence");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) module_param(max_increment, int, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) MODULE_PARM_DESC(max_increment, "Limit on increment allowed during binary search");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) module_param(low_window, int, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) MODULE_PARM_DESC(low_window, "lower bound on congestion window (for TCP friendliness)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) module_param(beta, int, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) MODULE_PARM_DESC(beta, "beta for multiplicative increase");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) module_param(initial_ssthresh, int, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) MODULE_PARM_DESC(initial_ssthresh, "initial value of slow start threshold");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) module_param(smooth_part, int, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) MODULE_PARM_DESC(smooth_part, "log(B/(B*Smin))/log(B/(B-1))+B, # of RTT from Wmax-B to Wmax");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /* BIC TCP Parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) struct bictcp {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	u32	cnt;		/* increase cwnd by 1 after ACKs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	u32	last_max_cwnd;	/* last maximum snd_cwnd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	u32	last_cwnd;	/* the last snd_cwnd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	u32	last_time;	/* time when updated last_cwnd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	u32	epoch_start;	/* beginning of an epoch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #define ACK_RATIO_SHIFT	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	u32	delayed_ack;	/* estimate the ratio of Packets/ACKs << 4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static inline void bictcp_reset(struct bictcp *ca)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	ca->cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	ca->last_max_cwnd = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	ca->last_cwnd = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	ca->last_time = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	ca->epoch_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	ca->delayed_ack = 2 << ACK_RATIO_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) static void bictcp_init(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct bictcp *ca = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	bictcp_reset(ca);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (initial_ssthresh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		tcp_sk(sk)->snd_ssthresh = initial_ssthresh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * Compute congestion window to use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static inline void bictcp_update(struct bictcp *ca, u32 cwnd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	if (ca->last_cwnd == cwnd &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	    (s32)(tcp_jiffies32 - ca->last_time) <= HZ / 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	ca->last_cwnd = cwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	ca->last_time = tcp_jiffies32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (ca->epoch_start == 0) /* record the beginning of an epoch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		ca->epoch_start = tcp_jiffies32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	/* start off normal */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if (cwnd <= low_window) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		ca->cnt = cwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	/* binary increase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (cwnd < ca->last_max_cwnd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		__u32	dist = (ca->last_max_cwnd - cwnd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			/ BICTCP_B;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		if (dist > max_increment)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			/* linear increase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			ca->cnt = cwnd / max_increment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		else if (dist <= 1U)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			/* binary search increase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			ca->cnt = (cwnd * smooth_part) / BICTCP_B;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			/* binary search increase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			ca->cnt = cwnd / dist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		/* slow start AMD linear increase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		if (cwnd < ca->last_max_cwnd + BICTCP_B)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			/* slow start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			ca->cnt = (cwnd * smooth_part) / BICTCP_B;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		else if (cwnd < ca->last_max_cwnd + max_increment*(BICTCP_B-1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			/* slow start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			ca->cnt = (cwnd * (BICTCP_B-1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 				/ (cwnd - ca->last_max_cwnd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			/* linear increase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			ca->cnt = cwnd / max_increment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	/* if in slow start or link utilization is very low */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (ca->last_max_cwnd == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		if (ca->cnt > 20) /* increase cwnd 5% per RTT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			ca->cnt = 20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	ca->cnt = (ca->cnt << ACK_RATIO_SHIFT) / ca->delayed_ack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	if (ca->cnt == 0)			/* cannot be zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		ca->cnt = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static void bictcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct tcp_sock *tp = tcp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	struct bictcp *ca = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (!tcp_is_cwnd_limited(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (tcp_in_slow_start(tp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		acked = tcp_slow_start(tp, acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		if (!acked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	bictcp_update(ca, tp->snd_cwnd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	tcp_cong_avoid_ai(tp, ca->cnt, acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)  *	behave like Reno until low_window is reached,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)  *	then increase congestion window slowly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static u32 bictcp_recalc_ssthresh(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	const struct tcp_sock *tp = tcp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	struct bictcp *ca = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	ca->epoch_start = 0;	/* end of epoch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	/* Wmax and fast convergence */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (tp->snd_cwnd < ca->last_max_cwnd && fast_convergence)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		ca->last_max_cwnd = (tp->snd_cwnd * (BICTCP_BETA_SCALE + beta))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			/ (2 * BICTCP_BETA_SCALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		ca->last_max_cwnd = tp->snd_cwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (tp->snd_cwnd <= low_window)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		return max(tp->snd_cwnd >> 1U, 2U);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		return max((tp->snd_cwnd * beta) / BICTCP_BETA_SCALE, 2U);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static void bictcp_state(struct sock *sk, u8 new_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (new_state == TCP_CA_Loss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		bictcp_reset(inet_csk_ca(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /* Track delayed acknowledgment ratio using sliding window
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  * ratio = (15*ratio + sample) / 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static void bictcp_acked(struct sock *sk, const struct ack_sample *sample)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	const struct inet_connection_sock *icsk = inet_csk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (icsk->icsk_ca_state == TCP_CA_Open) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		struct bictcp *ca = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		ca->delayed_ack += sample->pkts_acked -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			(ca->delayed_ack >> ACK_RATIO_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static struct tcp_congestion_ops bictcp __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	.init		= bictcp_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	.ssthresh	= bictcp_recalc_ssthresh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	.cong_avoid	= bictcp_cong_avoid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	.set_state	= bictcp_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	.undo_cwnd	= tcp_reno_undo_cwnd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	.pkts_acked     = bictcp_acked,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	.name		= "bic",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int __init bictcp_register(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	BUILD_BUG_ON(sizeof(struct bictcp) > ICSK_CA_PRIV_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	return tcp_register_congestion_control(&bictcp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) static void __exit bictcp_unregister(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	tcp_unregister_congestion_control(&bictcp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) module_init(bictcp_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) module_exit(bictcp_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) MODULE_AUTHOR("Stephen Hemminger");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) MODULE_DESCRIPTION("BIC TCP");