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40 lines
1.0 KiB
40 lines
1.0 KiB
#ifndef _TCP_DCTCP_H |
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#define _TCP_DCTCP_H |
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static inline void dctcp_ece_ack_cwr(struct sock *sk, u32 ce_state) |
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{ |
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struct tcp_sock *tp = tcp_sk(sk); |
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if (ce_state == 1) |
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tp->ecn_flags |= TCP_ECN_DEMAND_CWR; |
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else |
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tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR; |
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} |
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/* Minimal DCTP CE state machine: |
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* |
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* S: 0 <- last pkt was non-CE |
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* 1 <- last pkt was CE |
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*/ |
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static inline void dctcp_ece_ack_update(struct sock *sk, enum tcp_ca_event evt, |
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u32 *prior_rcv_nxt, u32 *ce_state) |
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{ |
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u32 new_ce_state = (evt == CA_EVENT_ECN_IS_CE) ? 1 : 0; |
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if (*ce_state != new_ce_state) { |
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/* CE state has changed, force an immediate ACK to |
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* reflect the new CE state. If an ACK was delayed, |
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* send that first to reflect the prior CE state. |
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*/ |
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if (inet_csk(sk)->icsk_ack.pending & ICSK_ACK_TIMER) { |
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dctcp_ece_ack_cwr(sk, *ce_state); |
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__tcp_send_ack(sk, *prior_rcv_nxt); |
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} |
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inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_NOW; |
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} |
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*prior_rcv_nxt = tcp_sk(sk)->rcv_nxt; |
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*ce_state = new_ce_state; |
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dctcp_ece_ack_cwr(sk, new_ce_state); |
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} |
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#endif
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