probeProgram: catch sys.ENOTSUPP error for unknown op codes

This commit extends the error catching in the `probeProgram` function by
additionally catching `sys.ENOTSUPP`. We see this error being returned
when compiling BPF programs that contain instructions with an unknown
op code (ex. checking ISA v4 support in arm64 with kernel version <v6.6).
This error code is different than EINVAL or EOPNOTSUPP.

Signed-off-by: Simone Magnani <simone.magnani@isovalent.com>

Author: smagnani96

features/prog.go

@@ -40,11 +40,12 @@ func probeProgram(spec *ebpf.ProgramSpec) error {
 	}
 
 	switch {
+	// ENOTSUPP occurs when attempting to create a program with an unknown op code.
 	// EINVAL occurs when attempting to create a program with an unknown type.
 	// E2BIG occurs when ProgLoadAttr contains non-zero bytes past the end
 	// of the struct known by the running kernel, meaning the kernel is too old
 	// to support the given prog type.
-	case errors.Is(err, unix.EINVAL), errors.Is(err, unix.E2BIG):
+	case errors.Is(err, sys.ENOTSUPP), errors.Is(err, unix.EINVAL), errors.Is(err, unix.E2BIG):
 		err = ebpf.ErrNotSupported
 	}