feat(dataplane): create taps at initialization

Create taps for the interfaces specified via cmd line args.
Taps should be created before drivers start so that the latter
can learn their during their initialization.

Signed-off-by: Fredi Raspall <fredi@githedgehog.com>

Author: Fredi-raspall

dataplane/src/main.rs

@@ -20,7 +20,7 @@ use pyroscope::PyroscopeAgent;
 use pyroscope_pprofrs::{PprofConfig, pprof_backend};
 
 use net::buffer::{TestBuffer, TestBufferPool};
-use pkt_io::start_io;
+use pkt_io::{start_io, tap_init};
 
 use routing::RouterParamsBuilder;
 use tracectl::{custom_target, get_trace_ctl, trace_target};
@@ -133,15 +133,18 @@ fn main() {
     // pipeline builder
     let pipeline_factory = setup.pipeline;
 
-    // Start driver with the provided pipeline builder. Driver should create a portmap table,
-    // populate it with [`PortSpec`]s and return the writer
+    // Start driver with the provided pipeline builder. Taps must have been created before this
+    // happens so that their ifindex is available when drivers initialize.
     let (_handle, iom_ctl) = {
         match &launch_config.driver {
-            args::DriverConfigSection::Dpdk(_section) => {
+            args::DriverConfigSection::Dpdk(section) => {
+                tap_init(&section.interfaces).expect("Tap initialization failed");
+
                 info!("Using driver DPDK...");
                 todo!();
             }
             args::DriverConfigSection::Kernel(section) => {
+                tap_init(&section.interfaces).expect("Tap initialization failed");
                 info!("Using driver kernel...");
                 DriverKernel::start(
                     section.interfaces.clone().into_iter(),