tools/net/ynl: Add support for create flags

Add support for using NLM_F_REPLACE, _EXCL, _CREATE and _APPEND flags
in requests.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20230825122756.7603-10-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: donaldh

tools/net/ynl/cli.py

@@ -6,7 +6,7 @@
 import pprint
 import time
 
-from lib import YnlFamily
+from lib import YnlFamily, Netlink
 
 
 def main():
@@ -19,6 +19,14 @@ def main():
     parser.add_argument('--dump', dest='dump', type=str)
     parser.add_argument('--sleep', dest='sleep', type=int)
     parser.add_argument('--subscribe', dest='ntf', type=str)
+    parser.add_argument('--replace', dest='flags', action='append_const',
+                        const=Netlink.NLM_F_REPLACE)
+    parser.add_argument('--excl', dest='flags', action='append_const',
+                        const=Netlink.NLM_F_EXCL)
+    parser.add_argument('--create', dest='flags', action='append_const',
+                        const=Netlink.NLM_F_CREATE)
+    parser.add_argument('--append', dest='flags', action='append_const',
+                        const=Netlink.NLM_F_APPEND)
     args = parser.parse_args()
 
     if args.no_schema:
@@ -37,7 +45,7 @@ def main():
         time.sleep(args.sleep)
 
     if args.do:
-        reply = ynl.do(args.do, attrs)
+        reply = ynl.do(args.do, attrs, args.flags)
         pprint.PrettyPrinter().pprint(reply)
     if args.dump:
         reply = ynl.dump(args.dump, attrs)

tools/net/ynl/lib/__init__.py

@@ -2,7 +2,7 @@
 
 from .nlspec import SpecAttr, SpecAttrSet, SpecEnumEntry, SpecEnumSet, \
     SpecFamily, SpecOperation
-from .ynl import YnlFamily
+from .ynl import YnlFamily, Netlink
 
 __all__ = ["SpecAttr", "SpecAttrSet", "SpecEnumEntry", "SpecEnumSet",
-           "SpecFamily", "SpecOperation", "YnlFamily"]
+           "SpecFamily", "SpecOperation", "YnlFamily", "Netlink"]

tools/net/ynl/lib/ynl.py

@@ -35,6 +35,10 @@ class Netlink:
     NLM_F_ACK = 4
     NLM_F_ROOT = 0x100
     NLM_F_MATCH = 0x200
+
+    NLM_F_REPLACE = 0x100
+    NLM_F_EXCL = 0x200
+    NLM_F_CREATE = 0x400
     NLM_F_APPEND = 0x800
 
     NLM_F_CAPPED = 0x100
@@ -654,10 +658,12 @@ def operation_do_attributes(self, name):
 
       return op['do']['request']['attributes'].copy()
 
-    def _op(self, method, vals, dump=False):
+    def _op(self, method, vals, flags, dump=False):
         op = self.ops[method]
 
         nl_flags = Netlink.NLM_F_REQUEST | Netlink.NLM_F_ACK
+        for flag in flags or []:
+            nl_flags |= flag
         if dump:
             nl_flags |= Netlink.NLM_F_DUMP
 
@@ -716,8 +722,8 @@ def _op(self, method, vals, dump=False):
             return rsp[0]
         return rsp
 
-    def do(self, method, vals):
-        return self._op(method, vals)
+    def do(self, method, vals, flags):
+        return self._op(method, vals, flags)
 
     def dump(self, method, vals):
-        return self._op(method, vals, dump=True)
+        return self._op(method, vals, [], dump=True)