feat: provide ethtool-style features

api/resource/definitions/network/network.proto

@@ -183,6 +183,8 @@ message LinkStatusSpec {
   BondMasterSpec bond_master = 28;
   WireguardSpec wireguard = 29;
   bytes permanent_addr = 30;
+  map<string, string> features = 31;
+  map<string, bool> private_flags = 32;
 }
 
 // NfTablesAddressMatch describes the match on the IP address.

internal/app/machined/pkg/controllers/network/link_status.go

@@ -22,6 +22,7 @@ import (
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	networkadapter "github.com/siderolabs/talos/internal/app/machined/pkg/adapters/network"
+	networkutils "github.com/siderolabs/talos/internal/app/machined/pkg/controllers/network/utils"
 	"github.com/siderolabs/talos/internal/app/machined/pkg/controllers/network/watch"
 	"github.com/siderolabs/talos/internal/app/machined/pkg/controllers/runtime"
 	"github.com/siderolabs/talos/internal/pkg/pci"
@@ -166,6 +167,8 @@ func (ctrl *LinkStatusController) reconcile(
 			ethMode       *ethtool.LinkMode
 			driverInfo    ethtoolioctl.DrvInfo
 			permanentAddr net.HardwareAddr
+			features      map[string]ethtoolioctl.FeatureState
+			privateFlags  map[string]bool
 		)
 
 		if ethClient != nil {
@@ -221,6 +224,16 @@ func (ctrl *LinkStatusController) reconcile(
 					}
 				}
 			}
+
+			features, err = ethtoolIoctlClient.FeaturesWithState(link.Attributes.Name)
+			if err != nil {
+				logger.Warn("error querying ethtool ioctl features", zap.String("link", link.Attributes.Name), zap.Error(err))
+			}
+
+			privateFlags, err = ethtoolIoctlClient.PrivFlags(link.Attributes.Name)
+			if err != nil {
+				logger.Warn("error querying ethtool ioctl private flags", zap.String("link", link.Attributes.Name), zap.Error(err))
+			}
 		}
 
 		if err = r.Modify(ctx, network.NewLinkStatus(network.NamespaceName, link.Attributes.Name), func(r resource.Resource) error {
@@ -310,6 +323,9 @@ func (ctrl *LinkStatusController) reconcile(
 			status.DriverVersion = driverInfo.Version
 			status.FirmwareVersion = driverInfo.FwVersion
 
+			status.PrivateFlags = privateFlags
+			status.Features = networkutils.FormatFeatures(features)
+
 			// link.Attributes.Info will be non-nil, because we set status.Kind above using link.Attributes.Info.Kind
 			var rawLinkData []byte
 

internal/app/machined/pkg/controllers/network/utils/utils.go

@@ -7,10 +7,13 @@ package networkutils
 
 import (
 	"context"
+	"slices"
 
 	"github.com/cosi-project/runtime/pkg/controller"
 	"github.com/cosi-project/runtime/pkg/safe"
 	"github.com/cosi-project/runtime/pkg/state"
+	"github.com/safchain/ethtool"
+	"github.com/siderolabs/gen/maps"
 	"github.com/siderolabs/gen/optional"
 
 	"github.com/siderolabs/talos/pkg/machinery/resources/network"
@@ -64,3 +67,41 @@ func WaitForNetworkReady(ctx context.Context, r controller.Runtime, condition fu
 
 	return nil
 }
+
+// FormatFeatures formats ethtool features.
+func FormatFeatures(features map[string]ethtool.FeatureState) map[string]string {
+	if features == nil {
+		return nil
+	}
+
+	keys := maps.Keys(features)
+	slices.Sort(keys)
+
+	out := make(map[string]string, len(keys))
+
+	for _, feature := range keys {
+		state := features[feature]
+
+		var value string
+
+		if state.Active {
+			value = "on"
+		} else {
+			value = "off"
+		}
+
+		if !state.Available || state.NeverChanged {
+			value += " [fixed]"
+		} else if state.Requested != state.Active {
+			if state.Requested {
+				value += " [requested on]"
+			} else {
+				value += " [requested off]"
+			}
+		}
+
+		out[feature] = value
+	}
+
+	return out
+}