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vlan: use parent interface mtu as default

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After commit 22e8af6242 ("device: set a per-device default MTU on
activation") we explicitly set the VLAN MTU to 1500 if not overridden
by user settings. This has the advantage that the MTU is set to a
predictable value, while before it could have different values
depending on when the interface was created (for example, the
interface would get a 1500 MTU if created during boot, or would
inherit the parent's MTU if activated manually).

However, a better default value is the MTU of the parent interface
which is in most cases what the user wants. This value was the default
before commit 22e8af6242 for manually activated connections.

https://bugzilla.redhat.com/show_bug.cgi?id=1414186
This commit is contained in:
Beniamino Galvani 2017-01-18 11:25:38 +01:00
parent 8134d72f49
commit 7dde8d8106
1 changed files with 19 additions and 1 deletions
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20
src/devices/nm-device-vlan.c
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@ -572,6 +572,24 @@ act_stage1_prepare (NMDevice *device, NMDeviceStateReason *reason)
return ret;
}
static guint32
get_configured_mtu (NMDevice *self, gboolean *out_is_user_config)
{
guint32 mtu = 0;
int ifindex;
mtu = nm_device_get_configured_mtu_for_wired (self, out_is_user_config);
if (*out_is_user_config)
return mtu;
/* Inherit the MTU from parent device, if any */
ifindex = nm_device_parent_get_ifindex (self);
if (ifindex > 0)
mtu = nm_platform_link_get_mtu (NM_PLATFORM_GET, ifindex);
return mtu ?: NM_DEVICE_DEFAULT_MTU_WIRED;
}
/*****************************************************************************/
static void
@ -612,7 +630,7 @@ nm_device_vlan_class_init (NMDeviceVlanClass *klass)
parent_class->unrealize_notify = unrealize_notify;
parent_class->get_generic_capabilities = get_generic_capabilities;
parent_class->act_stage1_prepare = act_stage1_prepare;
parent_class->get_configured_mtu = nm_device_get_configured_mtu_for_wired;
parent_class->get_configured_mtu = get_configured_mtu;
parent_class->is_available = is_available;
parent_class->parent_changed_notify = parent_changed_notify;