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tcp: add u32 counter in tcp_sock and an SNMP counter for PLB

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A u32 counter is added to tcp_sock for counting the number of PLB
triggered rehashes for a TCP connection. An SNMP counter is also
added to count overall PLB triggered rehash events for a host. These
counters are hooked up to PLB implementation for DCTCP.

TCP_NLA_REHASH is added to SCM_TIMESTAMPING_OPT_STATS that reports
the rehash attempts triggered due to PLB or timeouts. This gives
a historical view of sustained congestion or timeouts experienced
by the TCP connection.

Signed-off-by: Mubashir Adnan Qureshi <mubashirq@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mubashir Adnan Qureshi
2022-10-26 13:51:14 +00:00
committed by David S. Miller
parent c30f8e0b04
commit 29c1c44646
6 changed files with 9 additions and 0 deletions
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1
include/uapi/linux/tcp.h
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@@ -315,6 +315,7 @@ enum {
TCP_NLA_BYTES_NOTSENT, /* Bytes in write queue not yet sent */
TCP_NLA_EDT, /* Earliest departure time (CLOCK_MONOTONIC) */
TCP_NLA_TTL, /* TTL or hop limit of a packet received */
TCP_NLA_REHASH, /* PLB and timeout triggered rehash attempts */
};
/* for TCP_MD5SIG socket option */