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)  * TCP Veno congestion control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * This is based on the congestion detection/avoidance scheme described in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *    C. P. Fu, S. C. Liew.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *    "TCP Veno: TCP Enhancement for Transmission over Wireless Access Networks."
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *    IEEE Journal on Selected Areas in Communication,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *    Feb. 2003.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * 	See https://www.ie.cuhk.edu.hk/fileadmin/staff_upload/soung/Journal/J3.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/inet_diag.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /* Default values of the Veno variables, in fixed-point representation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * with V_PARAM_SHIFT bits to the right of the binary point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define V_PARAM_SHIFT 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static const int beta = 3 << V_PARAM_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /* Veno variables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) struct veno {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	u8 doing_veno_now;	/* if true, do veno for this rtt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	u16 cntrtt;		/* # of rtts measured within last rtt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	u32 minrtt;		/* min of rtts measured within last rtt (in usec) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	u32 basertt;		/* the min of all Veno rtt measurements seen (in usec) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	u32 inc;		/* decide whether to increase cwnd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	u32 diff;		/* calculate the diff rate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) /* There are several situations when we must "re-start" Veno:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  *  o when a connection is established
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  *  o after an RTO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  *  o after fast recovery
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  *  o when we send a packet and there is no outstanding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  *    unacknowledged data (restarting an idle connection)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static inline void veno_enable(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct veno *veno = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	/* turn on Veno */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	veno->doing_veno_now = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	veno->minrtt = 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) static inline void veno_disable(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	struct veno *veno = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	/* turn off Veno */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	veno->doing_veno_now = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static void tcp_veno_init(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	struct veno *veno = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	veno->basertt = 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	veno->inc = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	veno_enable(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) /* Do rtt sampling needed for Veno. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) static void tcp_veno_pkts_acked(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 				const struct ack_sample *sample)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	struct veno *veno = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	u32 vrtt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (sample->rtt_us < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	/* Never allow zero rtt or baseRTT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	vrtt = sample->rtt_us + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	/* Filter to find propagation delay: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (vrtt < veno->basertt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		veno->basertt = vrtt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	/* Find the min rtt during the last rtt to find
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	 * the current prop. delay + queuing delay:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	veno->minrtt = min(veno->minrtt, vrtt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	veno->cntrtt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) static void tcp_veno_state(struct sock *sk, u8 ca_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (ca_state == TCP_CA_Open)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		veno_enable(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		veno_disable(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  * If the connection is idle and we are restarting,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)  * then we don't want to do any Veno calculations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  * until we get fresh rtt samples.  So when we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  * restart, we reset our Veno state to a clean
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  * state. After we get acks for this flight of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)  * packets, _then_ we can make Veno calculations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)  * again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static void tcp_veno_cwnd_event(struct sock *sk, enum tcp_ca_event event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (event == CA_EVENT_CWND_RESTART || event == CA_EVENT_TX_START)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		tcp_veno_init(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static void tcp_veno_cong_avoid(struct sock *sk, u32 ack, u32 acked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	struct tcp_sock *tp = tcp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	struct veno *veno = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (!veno->doing_veno_now) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		tcp_reno_cong_avoid(sk, ack, acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		return;
^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) 	/* limited by applications */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (!tcp_is_cwnd_limited(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	/* We do the Veno calculations only if we got enough rtt samples */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (veno->cntrtt <= 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		/* We don't have enough rtt samples to do the Veno
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		 * calculation, so we'll behave like Reno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		tcp_reno_cong_avoid(sk, ack, acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		u64 target_cwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		u32 rtt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		/* We have enough rtt samples, so, using the Veno
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		 * algorithm, we determine the state of the network.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		rtt = veno->minrtt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		target_cwnd = (u64)tp->snd_cwnd * veno->basertt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		target_cwnd <<= V_PARAM_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		do_div(target_cwnd, rtt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		veno->diff = (tp->snd_cwnd << V_PARAM_SHIFT) - target_cwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		if (tcp_in_slow_start(tp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			/* Slow start. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			acked = tcp_slow_start(tp, acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			if (!acked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 				goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		/* Congestion avoidance. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		if (veno->diff < beta) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			/* In the "non-congestive state", increase cwnd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			 * every rtt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			tcp_cong_avoid_ai(tp, tp->snd_cwnd, acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			/* In the "congestive state", increase cwnd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			 * every other rtt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 				if (veno->inc &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 				    tp->snd_cwnd < tp->snd_cwnd_clamp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 					tp->snd_cwnd++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 					veno->inc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 				} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 					veno->inc = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 				tp->snd_cwnd_cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 				tp->snd_cwnd_cnt += acked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		if (tp->snd_cwnd < 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			tp->snd_cwnd = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		else if (tp->snd_cwnd > tp->snd_cwnd_clamp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			tp->snd_cwnd = tp->snd_cwnd_clamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	/* Wipe the slate clean for the next rtt. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	/* veno->cntrtt = 0; */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	veno->minrtt = 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* Veno MD phase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static u32 tcp_veno_ssthresh(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	const struct tcp_sock *tp = tcp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct veno *veno = inet_csk_ca(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (veno->diff < beta)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		/* in "non-congestive state", cut cwnd by 1/5 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		return max(tp->snd_cwnd * 4 / 5, 2U);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		/* in "congestive state", cut cwnd by 1/2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		return max(tp->snd_cwnd >> 1U, 2U);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static struct tcp_congestion_ops tcp_veno __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	.init		= tcp_veno_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	.ssthresh	= tcp_veno_ssthresh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	.undo_cwnd	= tcp_reno_undo_cwnd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	.cong_avoid	= tcp_veno_cong_avoid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	.pkts_acked	= tcp_veno_pkts_acked,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	.set_state	= tcp_veno_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	.cwnd_event	= tcp_veno_cwnd_event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	.name		= "veno",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static int __init tcp_veno_register(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	BUILD_BUG_ON(sizeof(struct veno) > ICSK_CA_PRIV_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	tcp_register_congestion_control(&tcp_veno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static void __exit tcp_veno_unregister(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	tcp_unregister_congestion_control(&tcp_veno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) module_init(tcp_veno_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) module_exit(tcp_veno_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) MODULE_AUTHOR("Bin Zhou, Cheng Peng Fu");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) MODULE_DESCRIPTION("TCP Veno");