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tcp: record last received ipv6 flowlabel

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In order to better estimate whether a data packet has been
retransmitted or is the result of a TLP, we save the last received
ipv6 flowlabel.

To make space for this field we resize the "ato" field in
inet_connection_sock as the current value of TCP_DELACK_MAX can be
fully contained in 8 bits and add a compile_time_assert ensuring this
field is the required size.

v2: addressed kernel bot feedback about dccp_delack_timer()
v3: addressed build error introduced by commit bbf80d713f ("tcp:
derive delack_max from rto_min")

Signed-off-by: David Morley <morleyd@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Tested-by: David Morley <morleyd@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
David Morley
2023-10-06 01:18:40 +00:00
committed by Paolo Abeni
parent 8cea95b0bd
commit 95b9a87c6a
6 changed files with 26 additions and 6 deletions
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5
include/net/inet_connection_sock.h
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@@ -114,7 +114,10 @@ struct inet_connection_sock {
__u8 quick; /* Scheduled number of quick acks */
__u8 pingpong; /* The session is interactive */
__u8 retry; /* Number of attempts */
__u32 ato; /* Predicted tick of soft clock */
#define ATO_BITS 8
__u32 ato:ATO_BITS, /* Predicted tick of soft clock */
lrcv_flowlabel:20, /* last received ipv6 flowlabel */
unused:4;
unsigned long timeout; /* Currently scheduled timeout */
__u32 lrcvtime; /* timestamp of last received data packet */
__u16 last_seg_size; /* Size of last incoming segment */