Fix operational read for interface's MAC address

Hc2vpp supports 48-bit addresses.
VPP returns 64-bits, so ignore extended part.

This patch updates MAC address handling broken by
https://gerrit.fd.io/r/#/c/9090/

Change-Id: I7cc8d75e19f1f56e1f1adc23848a4a9baef87206
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

3 files changed, 14 insertions, 4 deletions

diff --git a/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/interfacesstate/InterfaceDataTranslator.java b/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/interfacesstate/InterfaceDataTranslator.java
index 01adefee1..9f788afc6 100644
--- a/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/interfacesstate/InterfaceDataTranslator.java
+++ b/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/interfacesstate/InterfaceDataTranslator.java
@@ -99,7 +99,11 @@ public interface InterfaceDataTranslator extends ByteDataTranslator, JvppReplyCo
         final int endIndex = PHYSICAL_ADDRESS_LENGTH;
         checkArgument(endIndex <= vppPhysAddress.length,
                 "Invalid physical address size (%s), expected >= %s", vppPhysAddress.length, endIndex);
-        return printHexBinary(vppPhysAddress);
+        // Extended (64-bit) MAC addresses are currently not supported , so use first 48-bits.
+        // Adding support for extended MAC addresses might require yang model change.
+        // Also VPP is not consistent (e.g. for TAP it allows to configure MAC of 6 bytes, but sw_interface_details
+        // contains 8 bytes.
+        return printHexBinary(vppPhysAddress, 0, PHYSICAL_ADDRESS_LENGTH);
     }
 
     /**
diff --git a/v3po/v3po2vpp/src/test/java/io/fd/hc2vpp/v3po/interfacesstate/InterfaceDataTranslatorTest.java b/v3po/v3po2vpp/src/test/java/io/fd/hc2vpp/v3po/interfacesstate/InterfaceDataTranslatorTest.java
index c58409754..9a9697413 100644
--- a/v3po/v3po2vpp/src/test/java/io/fd/hc2vpp/v3po/interfacesstate/InterfaceDataTranslatorTest.java
+++ b/v3po/v3po2vpp/src/test/java/io/fd/hc2vpp/v3po/interfacesstate/InterfaceDataTranslatorTest.java
@@ -30,7 +30,9 @@ public class InterfaceDataTranslatorTest implements InterfaceDataTranslator {
     @Test
     public void testVppPhysAddrToYang() throws Exception {
         assertEquals("01:02:03:04:05:06", vppPhysAddrToYang(new byte[]{1, 2, 3, 4, 5, 6}));
-        assertEquals("0a:0b:0c:0d:0e:0f", vppPhysAddrToYang(new byte[]{0xa, 0xb, 0xc, 0xd, 0xe, 0xf}));
+        // Extended (64-bit) MAC addresses are currently not supported (it might require yang model update),
+        // so test if extended part is ignored
+        assertEquals("0a:0b:0c:0d:0e:0f", vppPhysAddrToYang(new byte[]{0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0, 0}));
     }
 
     @Test(expected = NullPointerException.class)
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/hc2vpp/common/translate/util/ByteDataTranslator.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/hc2vpp/common/translate/util/ByteDataTranslator.java
index 25b8d50f0..c7583fb52 100644
--- a/vpp-common/vpp-translate-utils/src/main/java/io/fd/hc2vpp/common/translate/util/ByteDataTranslator.java
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/hc2vpp/common/translate/util/ByteDataTranslator.java
@@ -100,10 +100,14 @@ public interface ByteDataTranslator {
 
     default String printHexBinary(@Nonnull final byte[] bytes) {
         Objects.requireNonNull(bytes, "bytes array should not be null");
+        return printHexBinary(bytes, 0, bytes.length);
+    }
+
+    default String printHexBinary(@Nonnull final byte[] bytes, final int startIndex, final int endIndex) {
         StringBuilder str = new StringBuilder();
 
-        Impl.appendHexByte(str, bytes[0]);
-        for (int i = 1; i < bytes.length; i++) {
+        Impl.appendHexByte(str, bytes[startIndex]);
+        for (int i = startIndex + 1; i < endIndex; i++) {
             str.append(":");
             Impl.appendHexByte(str, bytes[i]);
         }