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ovs: set the MTU in ovsdb when changing platform MTU of ovs-interface

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If we change the the MTU of an ovs interface only through netlink, the
change could be overridden by ovs-vswitchd at any time when other
interfaces change. Set the MTU also in the ovsdb to prevent such
changes.

Note that if the MTU comes from the connection, we already set the
ovsdb MTU at creation time and so this other update becomes
useless. But it is needed when changing the MTU at runtime (reapply)
or when the MTU comes from a different source (e.g. DHCP).

(cherry picked from commit c2a9712945)
(cherry picked from commit e27a59c69e)
This commit is contained in:
Beniamino Galvani 2020-03-16 10:53:06 +01:00 • committed by Thomas Haller
parent b81370f70b
commit 99ef891db6
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GPG key ID: 29C2366E4DFC5728
3 changed files with 54 additions and 4 deletions
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17
src/devices/nm-device.c
View file

@ -9359,6 +9359,17 @@ _set_mtu (NMDevice *self, guint32 mtu)
}
}
static gboolean
set_platform_mtu (NMDevice *self, guint32 mtu)
{
int r;
r = nm_platform_link_set_mtu (nm_device_get_platform (self),
nm_device_get_ip_ifindex (self),
mtu);
return (r != -NME_PL_CANT_SET_MTU);
}
static void
_commit_mtu (NMDevice *self, const NMIP4Config *config)
{
@ -9518,10 +9529,7 @@ _commit_mtu (NMDevice *self, const NMIP4Config *config)
}
if (mtu_desired && mtu_desired != mtu_plat) {
int r;
r = nm_platform_link_set_mtu (nm_device_get_platform (self), ifindex, mtu_desired);
if (r == -NME_PL_CANT_SET_MTU) {
if (!NM_DEVICE_GET_CLASS (self)->set_platform_mtu (self, mtu_desired)) {
anticipated_failure = TRUE;
success = FALSE;
_LOGW (LOGD_DEVICE, "mtu: failure to set MTU. %s",
@ -17260,6 +17268,7 @@ nm_device_class_init (NMDeviceClass *klass)
klass->parent_changed_notify = parent_changed_notify;
klass->can_reapply_change = can_reapply_change;
klass->reapply_connection = reapply_connection;
klass->set_platform_mtu = set_platform_mtu;
obj_properties[PROP_UDI] =
g_param_spec_string (NM_DEVICE_UDI, "", "",

2
src/devices/nm-device.h
View file

@ -474,6 +474,8 @@ typedef struct _NMDeviceClass {
gboolean (* can_update_from_platform_link) (NMDevice *self, const NMPlatformLink *plink);
gboolean (* set_platform_mtu) (NMDevice *self, guint32 mtu);
/* Controls, whether to call act_stage2_config() callback also for assuming
* a device or for external activations. In this case, act_stage2_config() must
* take care not to touch the device's configuration. */

39
src/devices/ovs/nm-device-ovs-interface.c
View file

@ -135,6 +135,43 @@ _is_internal_interface (NMDevice *device)
return nm_streq (nm_setting_ovs_interface_get_interface_type (s_ovs_iface), "internal");
}
static void
set_platform_mtu_cb (GError *error, gpointer user_data)
{
NMDevice *device = user_data;
NMDeviceOvsInterface *self = NM_DEVICE_OVS_INTERFACE (device);
if ( error
&& !g_error_matches (error, NM_UTILS_ERROR, NM_UTILS_ERROR_CANCELLED_DISPOSING)) {
_LOGW (LOGD_DEVICE, "could not change mtu of '%s': %s",
nm_device_get_iface (device), error->message);
}
g_object_unref (device);
}
static gboolean
set_platform_mtu (NMDevice *device, guint32 mtu)
{
/*
* If the MTU is not set in ovsdb, Open vSwitch will change
* the MTU of an internal interface to match the minimum of
* the other interfaces in the bridge.
*/
/* FIXME(shutdown): the function should become cancellable so
* that it doesn't need to hold a reference to the device, and
* it can be stopped during shutdown.
*/
if (_is_internal_interface (device)) {
nm_ovsdb_set_interface_mtu (nm_ovsdb_get (),
nm_device_get_ip_iface (device),
mtu, set_platform_mtu_cb,
g_object_ref (device));
}
return NM_DEVICE_CLASS (nm_device_ovs_interface_parent_class)->set_platform_mtu (device, mtu);
}
static NMActStageReturn
act_stage3_ip_config_start (NMDevice *device,
int addr_family,
@ -365,4 +402,6 @@ nm_device_ovs_interface_class_init (NMDeviceOvsInterfaceClass *klass)
device_class->link_changed = link_changed;
device_class->act_stage3_ip_config_start = act_stage3_ip_config_start;
device_class->can_unmanaged_external_down = can_unmanaged_external_down;
device_class->set_platform_mtu = set_platform_mtu;
device_class->get_configured_mtu = nm_device_get_configured_mtu_for_wired;
}