Hi,
any comment about this patch ?
forum users still need it
https://forum.proxmox.com/threads/set-mtu-on-guest.45078/page-2
(and it could help too with vxlan and other tunneling where mtu need to be
reduce on guest)
- Mail original -
De: "aderumier"
À: "pve-devel"
Cc: "aderumier"
Envoyé: Vendredi 17 Avril 2020 07:47:20
Objet: [PATCH qemu-server] add virtio host_mtu feature.
This add a new "mtu" param to vm nic,
and force the mtu in the guest for virtio nic only.
Special value: 1 = set the same value than the bridge
---
PVE/QemuServer.pm | 19 +++
1 file changed, 19 insertions(+)
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 6445508..9baa6ff 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -884,6 +884,12 @@ my $net_fmt = {
description => 'Whether this interface should be disconnected (like pulling the
plug).',
optional => 1,
},
+ mtu => {
+ type => 'integer',
+ minimum => 1, maximum => 65520,
+ description => 'Force mtu (virtio only). 1 = bridge mtu value',
+ optional => 1,
+ },
};
my $netdesc = {
@@ -1593,6 +1599,19 @@ sub print_netdevice_full {
}
$tmpstr .= ",bootindex=$net->{bootindex}" if $net->{bootindex} ;
+ if($net->{model} eq 'virtio' && $net->{mtu} && $net->{bridge}) {
+
+ my $mtu = $net->{mtu};
+ my $bridge_mtu = PVE::Network::read_bridge_mtu($net->{bridge});
+
+ if($mtu == 1) {
+ $mtu = $bridge_mtu;
+ } else {
+ die "mtu $mtu is bigger than bridge mtu $bridge_mtu" if $mtu > $bridge_mtu;
+ }
+ $tmpstr .= ",host_mtu=$mtu";
+ }
+
if ($use_old_bios_files) {
my $romfile;
if ($device eq 'virtio-net-pci') {
--
2.20.1
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