Then, when a .netdev file of a stacked netdev is modified, the netdev
can be reconfigured with the updated setting by something like the
following way:
```
ip link del vlan99
networkctl reload
```
Note, removing the vlan interface in the above example may not be necessary,
e.g. when only VLAN flags, egress mapping, or ingress mapping are updated.
But, it is necessary when VLAN ID is updated.
Closes#9627.
Closes#27177.
Closes#34907.
Replaces #22557.
Several netdevs cannot set IFLA_ADDRESS or IFLA_MTU attribute on update.
Currently, the vtable field is unused, as we do not support updating
existing netdevs. Preparation for later commits.
- network_load() is always called with an empty OrderedHashmap, renamed the output
parameter to 'ret'.
- When netdev_load() is called on startup, the hashmap is NULL. When it is
called on reloading, the hashmap is not cleaned up.
Hence, then these cleanups are always no-op. Let's drop them.
Then, it is not necessary to free NetDev.ifname when a conflicting
.netdev file is already loaded.
This also split out netdev_detach_name() and netdev_detach_impl().
No functional change, just refactoring.
The macro used to return NULL if input was NULL or had the wrong type. Now
it asserts that input is nonnull and it has the expected type.
There are a few places where a missing or mismatched type was OK, but in a
majority of places, we would do both of the asserts. In various places we'd
only do one, but that was by ommission/mistake. So moving the asserts into the
macro allows us to save some lines.
This makes Request object takes hash, compare, free, and process functions.
With this change, the logic in networkd-queue.c can be mostly
independent of the type of the request or the object (e.g. Address) assigned
to the request, and it becomes simpler.
This also renames e.g. request_process_address() -> address_process_request().
Also, this drops type checks such as `assert(req->type == REQUEST_TYPE_ADDRESS)`,
as in the later commits, the function of processing request, e.g.
`address_process_request()`, will be assigned to the Request object when
it is created. And the request type will be used to distinguish and to
avoid deduplicating requests which do not have any assigned objects,
like REQUEST_TYPE_DHCP4_CLIENT. Hence, the type checks in process functions
are mostly not necessary and redundant.
This is mostly cleanups and preparation for later commits, and should
not change any behavior.
As suggested in https://github.com/systemd/systemd/pull/11484#issuecomment-775288617.
This does not touch anything exposed in src/systemd. Changing the defines there
would be a compatibility break.
Note that tests are broken after this commit. They will be fixed in the next one.
Intermediate Functional Block
The Intermediate Functional Block (ifb) pseudo network interface acts as a QoS concentrator for multiple different sources of traffic. Packets from or to other interfaces have to be redirected to it using the mirred action in order to be handled, regularly routed traffic will be dropped. This way, a single stack of qdiscs, classes and filters can be shared between multiple interfaces.
Here's a simple example to feed incoming traffic from multiple interfaces through a Stochastic Fairness Queue (sfq):
(1) # modprobe ifb
(2) # ip link set ifb0 up
(3) # tc qdisc add dev ifb0 root sfq
Yu Watanabe
Mike Yuan
Zbigniew Jędrzejewski-Szmek
Annika Wickert
Susant Sahani