[pve-devel] [PATCH pve-common] Inotify: fix mtu check

[Alexandre Derumier]

- special check for bond, ifupdown set parent mtu from
slaves mtu if no defined.

- error if parent mtu is lower than child mtu (not bigger)

- child inherit from parent mtu if not defined

- fix vlan check (parent/child was inverted)
---
 src/PVE/INotify.pm | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/PVE/INotify.pm b/src/PVE/INotify.pm
index 4cf8699..083fb70 100644
--- a/src/PVE/INotify.pm
+++ b/src/PVE/INotify.pm
@@ -754,16 +754,20 @@ my $extract_ovs_option = sub {
 };
 
 my $check_mtu = sub {
-    my ($ifaces, $parent, $child) = @_;
+    my ($ifaces, $parent, $child, $ifupdown2) = @_;
 
     die "check mtu - missing parent interface\n" if !$parent;
     die "check mtu - missing child interface\n" if !$child;
 
+    if($ifaces->{$parent}->{type} eq 'bond') {
+	$ifaces->{$parent}->{mtu} = $ifaces->{$child}->{mtu} if (!$ifaces->{$parent}->{mtu} && $ifaces->{$child}->{mtu} && !$ifupdown2);
+    }
+
     my $pmtu = $ifaces->{$parent}->{mtu} ? $ifaces->{$parent}->{mtu} : 1500;
-    my $cmtu = $ifaces->{$child}->{mtu} ? $ifaces->{$child}->{mtu} : 1500;
+    my $cmtu = $ifaces->{$child}->{mtu} ? $ifaces->{$child}->{mtu} : $pmtu;
 
-    die "interface '$parent' - mtu $pmtu is bigger than '$child' - mtu $cmtu\n"
-	if $pmtu > $cmtu;
+    die "interface '$parent' - mtu $pmtu is lower than '$child' - mtu $cmtu\n"
+	if $pmtu < $cmtu;
 };
 
 # config => {
@@ -1347,7 +1351,7 @@ sub __write_etc_network_interfaces {
 		    if !$n;
 		die "bond '$iface' - wrong interface type on slave '$p' " .
 		    "('$n->{type}' != 'eth')\n" if $n->{type} ne 'eth';
-		&$check_mtu($ifaces, $iface, $p);
+		&$check_mtu($ifaces, $iface, $p, $ifupdown2);
 	    }
 	}
     }
@@ -1393,7 +1397,7 @@ sub __write_etc_network_interfaces {
 		die "vlan '$iface' - wrong interface type on parent '$p' " .
 		    "('$n->{type}' != 'eth|bond|bridge' )\n";
 	    }
-	    &$check_mtu($ifaces, $iface, $p);
+	    &$check_mtu($ifaces, $p, $iface);
 	}
     }
 
-- 
2.11.0