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>

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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/linux/tcp.h

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1

include/uapi/linux/snmp.h

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include/uapi/linux/tcp.h

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1

net/ipv4/proc.c

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net/ipv4/tcp.c

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net/ipv4/tcp_plb.c

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