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device: expand comment on MTU selection

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(cherry picked from commit 6455a4e528)
This commit is contained in:
Beniamino Galvani 2019-09-11 10:57:07 +02:00
parent f35783c3fb
commit 37720d856a
1 changed files with 15 additions and 3 deletions
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18
src/devices/nm-device.c
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@ -9333,9 +9333,21 @@ _commit_mtu (NMDevice *self, const NMIP4Config *config)
{
guint32 mtu = 0;
/* preferably, get the MTU from explicit user-configuration.
* Only if that fails, look at the current @config (which contains
* MTUs from DHCP/PPP) or maybe fallback to a device-specific MTU. */
/* We take the MTU from various sources: (in order of increasing
* priority) parent link, IP configuration (which contains the
* MTU from DHCP/PPP), connection profile.
*
* We could just compare it with the platform MTU and apply it
* when different, but this would revert at random times manual
* changes done by the user with the MTU from the connection.
*
* Instead, we remember the source of the currently configured
* MTU and apply the new one only when the new source has a
* higher priority, so that we don't set a MTU from same source
* multiple times. An exception to this is for the PARENT
* source, since we need to keep tracking the parent MTU when it
* changes.
*/
if (NM_DEVICE_GET_CLASS (self)->get_configured_mtu)
mtu = NM_DEVICE_GET_CLASS (self)->get_configured_mtu (self, &source);