trace: output kernel requirement for trace

daeuniverse · Mar 28, 2024 · ad275c4 · ad275c4
1 parent c84a6a9
commit ad275c4
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Showing 2 changed files with 12 additions and 0 deletions.
diff --git a/common/consts/ebpf.go b/common/consts/ebpf.go
@@ -154,6 +154,7 @@ var (
 	ChecksumFeatureVersion                    = internal.Version{5, 8, 0}
 	ProgTypeSkLookupFeatureVersion            = internal.Version{5, 9, 0}
 	UserspaceBatchUpdateLpmTrieFeatureVersion = internal.Version{5, 13, 0}
+	HelperBpfGetFuncIPVersionFeatureVersion   = internal.Version{5, 15, 0}
 )
 
 const (

diff --git a/trace/trace.go b/trace/trace.go
@@ -20,6 +20,8 @@ import (
 	"github.com/cilium/ebpf/btf"
 	"github.com/cilium/ebpf/link"
 	"github.com/cilium/ebpf/ringbuf"
+	"github.com/daeuniverse/dae/common/consts"
+	internal "github.com/daeuniverse/dae/pkg/ebpf_internal"
 	"github.com/sirupsen/logrus"
 )
 
@@ -42,6 +44,15 @@ func init() {
 }
 
 func StartTrace(ctx context.Context, ipVersion int, l4ProtoNo uint16, port int, outputFile string) (err error) {
+	kernelVersion, err := internal.KernelVersion()
+	if err != nil {
+		return fmt.Errorf("failed to get kernel version: %w", err)
+	}
+	if requirement := consts.HelperBpfGetFuncIPVersionFeatureVersion; kernelVersion.Less(requirement) {
+		return fmt.Errorf("your kernel version %v does not support bpf_get_func_ip; expect >=%v; upgrade your kernel and try again",
+			kernelVersion.String(),
+			requirement.String())
+	}
 	objs, err := rewriteAndLoadBpf(ipVersion, l4ProtoNo, port)
 	if err != nil {
 		return