Commit 92be2f52 authored by Paolo Abeni's avatar Paolo Abeni Committed by Jakub Kicinski
Browse files

mptcp: add mib for xmit window sharing 



Bump a counter for counter when snd_wnd is shared among subflow,
for observability's sake.

Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
Signed-off-by: default avatarMat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent b713d006

net/mptcp/mib.c

+1 −0
Original line number Diff line number Diff line
@@ -56,6 +56,7 @@ static const struct snmp_mib mptcp_snmp_list[] = { 
	SNMP_MIB_ITEM("RcvPruned", MPTCP_MIB_RCVPRUNED),

	SNMP_MIB_ITEM("SubflowStale", MPTCP_MIB_SUBFLOWSTALE),

	SNMP_MIB_ITEM("SubflowRecover", MPTCP_MIB_SUBFLOWRECOVER),

	SNMP_MIB_ITEM("SndWndShared", MPTCP_MIB_SNDWNDSHARED),

	SNMP_MIB_SENTINEL

};

net/mptcp/mib.h

+1 −0
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ enum linux_mptcp_mib_field { 
	MPTCP_MIB_RCVPRUNED,		/* Incoming packet dropped due to memory limit */

	MPTCP_MIB_SUBFLOWSTALE,		/* Subflows entered 'stale' status */

	MPTCP_MIB_SUBFLOWRECOVER,	/* Subflows returned to active status after being stale */

	MPTCP_MIB_SNDWNDSHARED,		/* Subflow snd wnd is overridden by msk's one */

	__MPTCP_MIB_MAX

};

net/mptcp/protocol.c

+3 −1
Original line number Diff line number Diff line
@@ -1153,8 +1153,10 @@ static int mptcp_check_allowed_size(const struct mptcp_sock *msk, struct sock *s 
	mptcp_snd_wnd = window_end - data_seq;

	avail_size = min_t(unsigned int, mptcp_snd_wnd, avail_size);



	if (unlikely(tcp_sk(ssk)->snd_wnd < mptcp_snd_wnd))

	if (unlikely(tcp_sk(ssk)->snd_wnd < mptcp_snd_wnd)) {

		tcp_sk(ssk)->snd_wnd = min_t(u64, U32_MAX, mptcp_snd_wnd);

		MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_SNDWNDSHARED);

	}



	return avail_size;

}