This is rather straight forward: for each object (in correct order),
if the object exists in VPP, we can skip it. We know that it will exist
only if it was valid (ie correct encapsulation, tc). If it does not
exist in VPP, issue the correct creation request to VPP.
Implement the creation of all types, in the following order:
- create_loopbacks() and create_bvis()
- create_bondethernets()
- create_vxlan_tunnels()
- create_sub_interfaces() first 1-tag, then 2-tag
- create_bridgedomains()
- create_lcps() bottomsup: first 0-tag, then 1-tag, then 2-tag names.
Add a placeholder TODO to fix a bug with prune_sub_interfaces() which
should allow for TAPs belonging to LCPs; will fix in followup commit.
After pruning elements from the VPP configuration, also remove them
from the configuration. The purpose of this is to leave a reasonable
representation of the VPP state in the configuration, so that subsequent
creates and syncs do not have to query the VPP API repeatedly.
The goal of this change is to be able to plan a complete path from
prune, create and sync, with only reading the initial VPP configuration
once, not multiple times.
- Add a get_sub_interfaces() call to fetch all DPDK / Bond sub-ints
- In prune_bvis(), prune_loopbacks() and prune_sub_interfaces(),
use sub_number_of_tags to go out-to-in (qinx, dot1x, untagged)
- Prune bridgedomains before pruning BVIs. The reason for this is that
prune_bridgedomains() will set the BVI to L3 mode, and if the BVI is
removed before the bridge is pruned, this is an error.
- When pruning bridge members, use the VPP configuration as the member
may not exist in the config, upon which the call to interface.is_sub()
will return False even if it is actually a VPP sub-int.
Update README.md, also take into account the previous change which calls
prune_addresses() before object deletion.
1. sub-ints have to be removed before their parent, particularly
bondethernets, because destroying BondEthernet0 will cascade
destruction of all of its sub-ints. So:
- first prune_sub_interfaces()
- then prune_bondethernets()
- finally prune_phys()
2. for any interface (loop, bvi, sub, phy, bond), prune_addresses()
before destroying the interface
Update the README with this new flow.
