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mptcp: add more offered MIBs counter 

Track the exceptional handling of MPTCP-level offered window
with a few more counters for observability.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2022-05-04 14:54:08 -07:00 committed by Jakub Kicinski
parent f3589be0c4
commit 38acb6260f
3 changed files with 13 additions and 1 deletions
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3
net/mptcp/mib.c
View File

@ -57,6 +57,9 @@ static const struct snmp_mib mptcp_snmp_list[] = {
SNMP_MIB_ITEM("SubflowStale", MPTCP_MIB_SUBFLOWSTALE),
SNMP_MIB_ITEM("SubflowRecover", MPTCP_MIB_SUBFLOWRECOVER),
SNMP_MIB_ITEM("SndWndShared", MPTCP_MIB_SNDWNDSHARED),
SNMP_MIB_ITEM("RcvWndShared", MPTCP_MIB_RCVWNDSHARED),
SNMP_MIB_ITEM("RcvWndConflictUpdate", MPTCP_MIB_RCVWNDCONFLICTUPDATE),
SNMP_MIB_ITEM("RcvWndConflict", MPTCP_MIB_RCVWNDCONFLICT),
SNMP_MIB_SENTINEL
};

5
net/mptcp/mib.h
View File

@ -50,6 +50,11 @@ enum linux_mptcp_mib_field {
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_RCVWNDSHARED, /* Subflow rcv wnd is overridden by msk's one */
MPTCP_MIB_RCVWNDCONFLICTUPDATE, /* subflow rcv wnd is overridden by msk's one due to
* conflict with another subflow while updating msk rcv wnd
*/
MPTCP_MIB_RCVWNDCONFLICT, /* Conflict with while updating msk rcv wnd */
__MPTCP_MIB_MAX
};

6
net/mptcp/options.c
View File

@ -1248,8 +1248,11 @@ static void mptcp_set_rwin(struct tcp_sock *tp, struct tcphdr *th)
if (rcv_wnd == rcv_wnd_old)
break;
if (before64(rcv_wnd_new, rcv_wnd))
if (before64(rcv_wnd_new, rcv_wnd)) {
MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_RCVWNDCONFLICTUPDATE);
goto raise_win;
}
MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_RCVWNDCONFLICT);
rcv_wnd_old = rcv_wnd;
}
return;
@ -1275,6 +1278,7 @@ raise_win:
/* RFC1323 scaling applied */
new_win >>= tp->rx_opt.rcv_wscale;
th->window = htons(new_win);
MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_RCVWNDSHARED);
}
}