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mptcp: zero window probe mib 

Explicitly account for MPTCP-level zero windows probe, to catch
hopefully earlier issues alike the one addressed by the previous
patch.

Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Tested-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20251028-net-mptcp-send-timeout-v1-4-38ffff5a9ec8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2025-10-28 09:16:55 +01:00 committed by Jakub Kicinski
parent a824084b98
commit fe11dfa109
3 changed files with 3 additions and 0 deletions
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1
net/mptcp/mib.c
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@ -85,6 +85,7 @@ static const struct snmp_mib mptcp_snmp_list[] = {
SNMP_MIB_ITEM("DssFallback", MPTCP_MIB_DSSFALLBACK),
SNMP_MIB_ITEM("SimultConnectFallback", MPTCP_MIB_SIMULTCONNFALLBACK),
SNMP_MIB_ITEM("FallbackFailed", MPTCP_MIB_FALLBACKFAILED),
SNMP_MIB_ITEM("WinProbe", MPTCP_MIB_WINPROBE),
};
/* mptcp_mib_alloc - allocate percpu mib counters

1
net/mptcp/mib.h
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@ -88,6 +88,7 @@ enum linux_mptcp_mib_field {
MPTCP_MIB_DSSFALLBACK, /* Bad or missing DSS */
MPTCP_MIB_SIMULTCONNFALLBACK, /* Simultaneous connect */
MPTCP_MIB_FALLBACKFAILED, /* Can't fallback due to msk status */
MPTCP_MIB_WINPROBE, /* MPTCP-level zero window probe */
__MPTCP_MIB_MAX
};

1
net/mptcp/protocol.c
View File

@ -1355,6 +1355,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
mpext->dsn64);
if (zero_window_probe) {
MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_WINPROBE);
mptcp_subflow_ctx(ssk)->rel_write_seq += copy;
mpext->frozen = 1;
if (READ_ONCE(msk->csum_enabled))