Struct NetPort 

pub struct NetPort {
    pub host_fd: i32,
    pub last_avail_tx: Atomic<u16>,
}

Host-side plumbing for a VirtioNet instance running under the custom VMM.

Holds the raw socket fd used to exchange L2 frames with the datapath (primary NIC) or the vmnet relay (bridge NIC), plus the TX cursor.

A NetPort is bound once via VirtioNet::bind_port after the host fd is known (which is after device registration, when the socketpair has been created). It is kept in an OnceLock on the device so hot-path methods can read both fields without mutex overhead.

Fields

host_fd: i32

Raw fd of the host-side socketpair peer. Reads pull inbound frames from the datapath; writes push guest TX frames to the datapath.

last_avail_tx: Atomic<u16>

Cursor into the TX avail ring — the last avail index the device has already drained. Wrapping u16 matches the VirtIO spec.

Trait Implementations

impl Debug for NetPort

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.