[PATCH net-next 2/2] ynl: support un-nest sub-type for indexed-array

[Hangbin Liu <liuhangbin@gmail.com>]

Support un-nest sub-type for indexed-array. Since all the attr types are
same for un-nest sub-ype, the index number is used as attr name.
The result would look like:

 # ip link add bond0 type bond mode 1 \
   arp_ip_target 192.168.1.1,192.168.1.2 ns_ip6_target 2001::1,2001::2
 # ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/rt_link.yaml \
   --do getlink --json '{"ifname": "bond0"}' --output-json | jq '.linkinfo'

    "arp-ip-target": [
      {
        "1": "192.168.1.1"
      },
      {
        "2": "192.168.1.2"
      }
    ],

    [...]

    "ns-ip6-target": [
      {
        "1": "2001::1"
      },
      {
        "2": "2001::2"
      }
    ],

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 tools/net/ynl/lib/ynl.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index 7239e673a28a..58a602ff9544 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -595,6 +595,21 @@ class YnlFamily(SpecFamily):
             decoded.append({ item.type: subattrs })
         return decoded
 
+    def _decode_index_array(self, attr, attr_spec):
+        decoded = []
+        offset = 0
+        index = 0
+        while offset < len(attr.raw):
+            index = index + 1
+            item = NlAttr(attr.raw, offset)
+            offset += item.full_len
+
+            subattrs = item.as_bin()
+            if attr_spec.display_hint:
+                subattrs = self._formatted_string(subattrs, attr_spec.display_hint)
+            decoded.append({ index: subattrs })
+        return decoded
+
     def _decode_nest_type_value(self, attr, attr_spec):
         decoded = {}
         value = attr
@@ -689,6 +704,8 @@ class YnlFamily(SpecFamily):
             elif attr_spec["type"] == 'indexed-array' and 'sub-type' in attr_spec:
                 if attr_spec["sub-type"] == 'nest':
                     decoded = self._decode_array_nest(attr, attr_spec)
+                else:
+                    decoded = self._decode_index_array(attr, attr_spec)
             elif attr_spec["type"] == 'bitfield32':
                 value, selector = struct.unpack("II", attr.raw)
                 if 'enum' in attr_spec:
-- 
2.43.0