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bond: restore MAC on release only when there is a cloned MAC address

Beniamino Galvani requested to merge bg/bond-mac into master

Currently we unconditionally reset the MAC to the previous value after releasing ports. This has some disadvantages:

  • by default, after the last port is removed the bond will have one of the previous port's address, which could conflict with the port;

  • in some cases, changing the bond MAC is not possible. For example when the bond is active-backup and has fail_over_mac=1|2. In such case the netlink call succeeds, but the address doesn't change; then NM would keep waiting for some time.

Don't try to restore the MAC unless the bond connection has a cloned MAC set.

Edited by Thomas Haller

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