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tools: ynl: cli: add --policy support

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Add --policy flag which can be combined with --do or --dump to query
the kernel's netlink policy for an operation instead of executing it.

Examples:

  $ ynl --family netdev --do dev-get --policy
  {'ifindex': {'max-value': 4294967295, 'min-value': 1, 'type': 'u32'}}

  $ ynl --family ethtool --do channels-get --policy --output-json
  {"header": {"type": "nested", "policy": {"dev-index": ...}}}

  $ ynl --family netdev --dump dev-get --policy
  {}

Link: https://patch.msgid.link/20260310005337.3594225-6-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2026-03-09 17:53:37 -07:00
parent 77a6401a87
commit d6df5e9b2a
1 changed files with 12 additions and 0 deletions
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12
tools/net/ynl/pyynl/cli.py
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@@ -256,6 +256,8 @@ def main():
schema_group.add_argument('--no-schema', action='store_true')
dbg_group = parser.add_argument_group('Debug options')
io_group.add_argument('--policy', action='store_true',
help='Query kernel policy for the operation instead of executing it')
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()")
@@ -308,6 +310,16 @@ def main():
if args.dbg_small_recv:
ynl.set_recv_dbg(True)
if args.policy:
if args.do:
pol = ynl.get_policy(args.do, 'do')
output(pol.attrs if pol else None)
args.do = None
if args.dump:
pol = ynl.get_policy(args.dump, 'dump')
output(pol.attrs if pol else None)
args.dump = None
if args.ntf:
ynl.ntf_subscribe(args.ntf)