tcp: extract code to compute SYNACK RTT
In preparation for adding another spot where we compute the SYNACK RTT, extract this code so that it can be shared. Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1137,6 +1137,15 @@ static inline void tcp_openreq_init(struct request_sock *req,
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ireq->loc_port = tcp_hdr(skb)->dest;
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}
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/* Compute time elapsed between SYNACK and the ACK completing 3WHS */
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static inline void tcp_synack_rtt_meas(struct sock *sk,
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struct request_sock *req)
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{
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if (tcp_rsk(req)->snt_synack)
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tcp_valid_rtt_meas(sk,
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tcp_time_stamp - tcp_rsk(req)->snt_synack);
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}
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extern void tcp_enter_memory_pressure(struct sock *sk);
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static inline int keepalive_intvl_when(const struct tcp_sock *tp)
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@ -1733,9 +1733,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
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newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
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tcp_initialize_rcv_mss(newsk);
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if (tcp_rsk(req)->snt_synack)
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tcp_valid_rtt_meas(newsk,
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tcp_time_stamp - tcp_rsk(req)->snt_synack);
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tcp_synack_rtt_meas(newsk, req);
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newtp->total_retrans = req->retrans;
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#ifdef CONFIG_TCP_MD5SIG
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@ -1348,9 +1348,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
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newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
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tcp_initialize_rcv_mss(newsk);
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if (tcp_rsk(req)->snt_synack)
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tcp_valid_rtt_meas(newsk,
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tcp_time_stamp - tcp_rsk(req)->snt_synack);
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tcp_synack_rtt_meas(newsk, req);
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newtp->total_retrans = req->retrans;
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newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
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