feat(init): implement dataplane NIC initialization

Implements basic NIC driver binding for DPDK compatibility.
Binds PCI network devices to vfio-pci driver as required
by DPDK for device control.

This is part 1 of the dataplane initialization system,
focusing on minimal viable functionality for team testing.

Future work:
- Add proper argument parsing
- Implement privilege dropping (especially CAP_SYS_ADMIN)
- Add exec to dataplane process after success

Signed-off-by: Daniel Noland <daniel@githedgehog.com>

Author: daniel-noland

init/src/main.rs

@@ -12,7 +12,7 @@ use std::path::PathBuf;
 use tracing::{error, info};
 
 use crate::{
-    nic::PciDriver,
+    nic::{BindToVfioPci, PciDriver, PciNic},
     sysfs::{SYSFS, SysfsPath},
 };
 
@@ -93,5 +93,13 @@ fn setup() {
 
 fn main() -> Result<(), InitErr> {
     setup();
+    // TODO: proper argument parsing
+    // -- hack add a real command line parser
+    let mut args = std::env::args().skip(1);
+    // -- end hack
+    // TODO: fix unwraps in the next PR.  These can't be properly addressed before the arg parser is done.
+    let address = hardware::pci::address::PciAddress::try_from(args.next().unwrap()).unwrap();
+    let mut device = PciNic::new(address)?;
+    device.bind_to_vfio_pci()?;
     Ok(())
 }