Commit 69e996c5 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller

tcp: add tp->tcp_mstamp field

We want to use precise timestamps in TCP stack, but we do not
want to call possibly expensive kernel time services too often.

tp->tcp_mstamp is guaranteed to be updated once per incoming packet.

We will use it in the following patches, removing specific
skb_mstamp_get() calls, and removing ack_time from
struct tcp_sacktag_state.
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 038a3e85
...@@ -240,6 +240,7 @@ struct tcp_sock { ...@@ -240,6 +240,7 @@ struct tcp_sock {
u32 tlp_high_seq; /* snd_nxt at the time of TLP retransmit. */ u32 tlp_high_seq; /* snd_nxt at the time of TLP retransmit. */
/* RTT measurement */ /* RTT measurement */
struct skb_mstamp tcp_mstamp; /* most recent packet received/sent */
u32 srtt_us; /* smoothed round trip time << 3 in usecs */ u32 srtt_us; /* smoothed round trip time << 3 in usecs */
u32 mdev_us; /* medium deviation */ u32 mdev_us; /* medium deviation */
u32 mdev_max_us; /* maximal mdev for the last rtt period */ u32 mdev_max_us; /* maximal mdev for the last rtt period */
......
...@@ -5362,6 +5362,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb, ...@@ -5362,6 +5362,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
{ {
struct tcp_sock *tp = tcp_sk(sk); struct tcp_sock *tp = tcp_sk(sk);
skb_mstamp_get(&tp->tcp_mstamp);
if (unlikely(!sk->sk_rx_dst)) if (unlikely(!sk->sk_rx_dst))
inet_csk(sk)->icsk_af_ops->sk_rx_dst_set(sk, skb); inet_csk(sk)->icsk_af_ops->sk_rx_dst_set(sk, skb);
/* /*
...@@ -5922,6 +5923,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb) ...@@ -5922,6 +5923,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
case TCP_SYN_SENT: case TCP_SYN_SENT:
tp->rx_opt.saw_tstamp = 0; tp->rx_opt.saw_tstamp = 0;
skb_mstamp_get(&tp->tcp_mstamp);
queued = tcp_rcv_synsent_state_process(sk, skb, th); queued = tcp_rcv_synsent_state_process(sk, skb, th);
if (queued >= 0) if (queued >= 0)
return queued; return queued;
...@@ -5933,6 +5935,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb) ...@@ -5933,6 +5935,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
return 0; return 0;
} }
skb_mstamp_get(&tp->tcp_mstamp);
tp->rx_opt.saw_tstamp = 0; tp->rx_opt.saw_tstamp = 0;
req = tp->fastopen_rsk; req = tp->fastopen_rsk;
if (req) { if (req) {
......
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