When doing a netdev_open(), a check is first done to make sure the
arguments are equivalent for any open devices with the same name. In
most cases, a simple shash comparison is sufficient. However, IPsec
key configuration is handled by an external program, so it is not pushed
down into the kernel module. Thus, when the "unparse_config" method is
called on an existing IPsec-based vport, a simple comparison with the
returned data will not match the original configuration. This commit
adds code to allow netdev-specific argument comparisons and has
"ipsec_gre" make use of them.
Bug #5575
This gives network device implementations the opportunity to fetch an
existing device's configuration and store it as their arguments, so that
netdev clients can find out how an existing device is configured.
So far netdev-vport is the only implementation that needs to use this.
The next commit will add use by clients.
Reviewed by Justin Pettit.
This commit removes the tunnel_egress_iface column from the
interface table and moves it's data to the status column. In the
process it reverts the database to version 1.0.0.
