tcp_dctcp.h (1036B)
1#ifndef _TCP_DCTCP_H 2#define _TCP_DCTCP_H 3 4static inline void dctcp_ece_ack_cwr(struct sock *sk, u32 ce_state) 5{ 6 struct tcp_sock *tp = tcp_sk(sk); 7 8 if (ce_state == 1) 9 tp->ecn_flags |= TCP_ECN_DEMAND_CWR; 10 else 11 tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR; 12} 13 14/* Minimal DCTP CE state machine: 15 * 16 * S: 0 <- last pkt was non-CE 17 * 1 <- last pkt was CE 18 */ 19static inline void dctcp_ece_ack_update(struct sock *sk, enum tcp_ca_event evt, 20 u32 *prior_rcv_nxt, u32 *ce_state) 21{ 22 u32 new_ce_state = (evt == CA_EVENT_ECN_IS_CE) ? 1 : 0; 23 24 if (*ce_state != new_ce_state) { 25 /* CE state has changed, force an immediate ACK to 26 * reflect the new CE state. If an ACK was delayed, 27 * send that first to reflect the prior CE state. 28 */ 29 if (inet_csk(sk)->icsk_ack.pending & ICSK_ACK_TIMER) { 30 dctcp_ece_ack_cwr(sk, *ce_state); 31 __tcp_send_ack(sk, *prior_rcv_nxt); 32 } 33 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_NOW; 34 } 35 *prior_rcv_nxt = tcp_sk(sk)->rcv_nxt; 36 *ce_state = new_ce_state; 37 dctcp_ece_ack_cwr(sk, new_ce_state); 38} 39 40#endif