datapath-windows: Make VPORT ovs number values smaller than MAXUINT16

datapath-windows: Make VPORT ovs number values smaller than MAXUINT16

For this, the old method of finding vports based on the
ovs port numbers is removed. Now, the lookup of a vport
by ovs port number is done the same way as the lookup by
hyper-v switch port id.

This is done so that the kernel is able to interact with
the userspace correctly when using vport channels.
The problem manifested in lib/dpif-netlink.c, at the function
vport_add_channels.

This patch removes the field vportArray from OVS_SWITCH_CONTEXT.
In its place, portNoHashArray is set. In the OVS_VPORT_ENTRY
struct, we also add portNoLink. This new method will do lookup
and insertions of vports by ovs (datapath) port numbers the same
way it is done for hyper-v switch port ids.

This patch implicitly removes the indexes, which were previously
used in insertions and lookups on ovs port numbers. The removal
of the index also means that the vxlan vport can no longer be
looked up the same way as it was done before: now we hold a pointer
to it, vxlanVport in OVS_SWITCH_CONTEXT. For the moment, we can
have only one vxlan vport. When more will be allowed, this field
will turn into a list of vxlan ports.

The invalid port number value (held in OVS_DPPORT_NUMBER_INVALID)
is now changed from 0 to MAXUINT16, the same as it is on linux.

The function OvsComputeVportNo has also been removed, since the
computation of a vport port number can no longer be done like this.
When vport add will be added, a new, updated OvsComputeVportNo
function will be added.

Also, in OvsInitVportCommon, we no longer need to (and no longer can)
initialize vport->ovsName, nor vport->ovsNameLen, because they will
be initialized by the netlink command vport add. Since the netlink
command vport add will generate numbers for the datapath (ovs) port
numbers and set the port names, we cannot insert the vport into the
hash array of port numbers here, nor into the hash array of port names.

Signed-off-by: Samuel Ghinet <sghinet@cloudbasesolutions.com>
Co-authored-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Tested-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>