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| author |   Eric Dumazet <edumazet@google.com> | 2014-09-05 15:33:32 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-09-05 17:49:33 -0700 |
| commit | 04317dafd11dd7b0ec19b85f098414abae6ed5f7 (patch) | |
| tree | 3e9a5c6b3aea2e8b1f519d031fb0fcfa4af970fb /include/net/tcp.h | |
| parent | Merge branch 'eth_get_headlen' (diff) | |
| download | linux-dev-04317dafd11dd7b0ec19b85f098414abae6ed5f7.tar.xz linux-dev-04317dafd11dd7b0ec19b85f098414abae6ed5f7.zip | |
tcp: introduce TCP_SKB_CB(skb)->tcp_tw_isn
TCP_SKB_CB(skb)->when has different meaning in output and input paths.
In output path, it contains a timestamp.
In input path, it contains an ISN, chosen by tcp_timewait_state_process()
Lets add a different name to ease code comprehension.
Note that 'when' field will disappear in following patch,
as skb_mstamp already contains timestamp, the anonymous
union will promptly disappear as well.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 590e01a476ac..0cd7d2c65dc0 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -698,7 +698,12 @@ struct tcp_skb_cb { } header; /* For incoming frames */ __u32 seq; /* Starting sequence number */ __u32 end_seq; /* SEQ + FIN + SYN + datalen */ - __u32 when; /* used to compute rtt's */ + union { + /* used in output path */ + __u32 when; /* used to compute rtt's */ + /* used in input path */ + __u32 tcp_tw_isn; /* isn chosen by tcp_timewait_state_process() */ + }; __u8 tcp_flags; /* TCP header flags. (tcp[13]) */ __u8 sacked; /* State flags for SACK/FACK. */ |