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| author |   Eric Dumazet <edumazet@google.com> | 2017-04-25 10:15:32 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-04-26 14:44:36 -0400 |
| commit | 69e996c58a35db9ca79b3f021a15bcd22202e1c0 (patch) | |
| tree | b01b75a8c41fe86ab2ce1fc88198c4f347268171 | |
| parent | rhashtable: remove insecure_max_entries param (diff) | |
| download | linux-dev-69e996c58a35db9ca79b3f021a15bcd22202e1c0.tar.xz linux-dev-69e996c58a35db9ca79b3f021a15bcd22202e1c0.zip | |
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: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/tcp.h | 1 | ||||
| -rw-r--r-- | net/ipv4/tcp_input.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index cbe5b602a2d3..99a22f44c32e 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -240,6 +240,7 @@ struct tcp_sock { u32 tlp_high_seq; /* snd_nxt at the time of TLP retransmit. */ /* RTT measurement */ + struct skb_mstamp tcp_mstamp; /* most recent packet received/sent */ u32 srtt_us; /* smoothed round trip time << 3 in usecs */ u32 mdev_us; /* medium deviation */ u32 mdev_max_us; /* maximal mdev for the last rtt period */ diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 5af2f04f8859..bd18c65df4a9 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5362,6 +5362,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb, { struct tcp_sock *tp = tcp_sk(sk); + skb_mstamp_get(&tp->tcp_mstamp); if (unlikely(!sk->sk_rx_dst)) 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) case TCP_SYN_SENT: tp->rx_opt.saw_tstamp = 0; + skb_mstamp_get(&tp->tcp_mstamp); queued = tcp_rcv_synsent_state_process(sk, skb, th); if (queued >= 0) return queued; @@ -5933,6 +5935,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb) return 0; } + skb_mstamp_get(&tp->tcp_mstamp); tp->rx_opt.saw_tstamp = 0; req = tp->fastopen_rsk; if (req) { |