Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) #ifndef _TCP_DCTCP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #define _TCP_DCTCP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) static inline void dctcp_ece_ack_cwr(struct sock *sk, u32 ce_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 	struct tcp_sock *tp = tcp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 	if (ce_state == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 		tp->ecn_flags |= TCP_ECN_DEMAND_CWR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 		tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /* Minimal DCTP CE state machine:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * S:	0 <- last pkt was non-CE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  *	1 <- last pkt was CE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static inline void dctcp_ece_ack_update(struct sock *sk, enum tcp_ca_event evt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 					u32 *prior_rcv_nxt, u32 *ce_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	u32 new_ce_state = (evt == CA_EVENT_ECN_IS_CE) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	if (*ce_state != new_ce_state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		/* CE state has changed, force an immediate ACK to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		 * reflect the new CE state. If an ACK was delayed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		 * send that first to reflect the prior CE state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		if (inet_csk(sk)->icsk_ack.pending & ICSK_ACK_TIMER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 			dctcp_ece_ack_cwr(sk, *ce_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 			__tcp_send_ack(sk, *prior_rcv_nxt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_NOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	*prior_rcv_nxt = tcp_sk(sk)->rcv_nxt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	*ce_state = new_ce_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	dctcp_ece_ack_cwr(sk, new_ce_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #endif