Description

For the moment, vdpa_sim_net allows to simulate a vdpa compatible interface but in loopback mode only.

The aim of this EPIC is to add to the vdpa_sim_net driver the hability  to communicate with the host network stack and thus to allow the VM to use the vdpa_sim_net like a real networking card supporting vDPA API. This is required for customer to experiment when they don't have HW.  

Acceptance Criteria

• ethtool, ip and other related networking commands can be used with the interface (on host, with virtio-vdpa,  in guest with virtio-net (guest) and vhost-vdpa (host)
• A guest using vhost-vdpa with vdpa_sim_net will be able to access network: user can connect from the host to the guest, user from the guest can connect to a remote host.
• virtio-vdpa will be able to use vdpa_sim_net to send and receive data from the host (an IP address can be set, a daemon can be listening on this IP address and client can connect to the daemon).