Add a --dbg-small-recv debug option to control the recv() buffer size
used by YNL, matching the same option already present in cli.py. This
is useful if user need to get large netlink message.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 tools/net/ynl/pyynl/ethtool.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/net/ynl/pyynl/ethtool.py b/tools/net/ynl/pyynl/ethtool.py
index 8bf234d594b3..6c50368de967 100755
--- a/tools/net/ynl/pyynl/ethtool.py
+++ b/tools/net/ynl/pyynl/ethtool.py
@@ -166,12 +166,19 @@ def main():
     parser.add_argument('device', metavar='device', type=str)
     parser.add_argument('args', metavar='args', type=str, nargs='*')
 
+    dbg_group = parser.add_argument_group('Debug options')
+    dbg_group.add_argument('--dbg-small-recv', default=0, const=4000,
+                           action='store', nargs='?', type=int, metavar='INT',
+                           help="Length of buffers used for recv()")
+
     args = parser.parse_args()
 
     spec = os.path.join(spec_dir(), 'ethtool.yaml')
     schema = os.path.join(schema_dir(), 'genetlink-legacy.yaml')
 
-    ynl = YnlFamily(spec, schema)
+    ynl = YnlFamily(spec, schema, recv_size=args.dbg_small_recv)
+    if args.dbg_small_recv:
+        ynl.set_recv_dbg(True)
 
     if args.set_priv_flags:
         # TODO: parse the bitmask

-- 
Git-155)