diff options
| author | Yuchung Cheng <ycheng@google.com> | 2012-10-19 19:14:44 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-10-22 23:16:06 +0400 |
| commit | 6f73601efb35c7003f5c58c2bc6fd08f3652169c (patch) | |
| tree | f77807af2f6bbe08104b4563eb150e9e425dfce6 /include | |
| parent | e6e71054cd9f98c8ebb3a5f66f2776a9736afc87 (diff) | |
| download | linux-6f73601efb35c7003f5c58c2bc6fd08f3652169c.tar.xz | |
tcp: add SYN/data info to TCP_INFO
Add a bit TCPI_OPT_SYN_DATA (32) to the socket option TCP_INFO:tcpi_options.
It's set if the data in SYN (sent or received) is acked by SYN-ACK. Server or
client application can use this information to check Fast Open success rate.
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tcp.h | 3 | ||||
| -rw-r--r-- | include/uapi/linux/tcp.h | 1 |
2 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 8a7fc4be2d75..60b7aac15e0e 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -191,7 +191,8 @@ struct tcp_sock { u8 do_early_retrans:1,/* Enable RFC5827 early-retransmit */ early_retrans_delayed:1, /* Delayed ER timer installed */ syn_data:1, /* SYN includes data */ - syn_fastopen:1; /* SYN includes Fast Open option */ + syn_fastopen:1, /* SYN includes Fast Open option */ + syn_data_acked:1;/* data in SYN is acked by SYN-ACK */ /* RTT measurement */ u32 srtt; /* smoothed round trip time << 3 */ diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index c4b89a5cb7df..e962faa5ab0d 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -130,6 +130,7 @@ enum { #define TCPI_OPT_WSCALE 4 #define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */ #define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */ +#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */ enum tcp_ca_state { TCP_CA_Open = 0, |