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tools: ynl: add unicast notification receive support

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Add ntf_bind() method to YnlFamily for binding the netlink
socket without joining a multicast group. This enables receiving
unicast notifications through the existing poll_ntf/check_ntf
path.

The OVS packet family sends MISS and ACTION upcalls via
genlmsg_unicast() to a per-vport PID rather than through a
multicast group. The existing ntf_subscribe() couples bind()
with setsockopt(ADD_MEMBERSHIP), which does not fit the unicast
case. ntf_bind() provides the bind-only alternative, with the
address defaulting to (0, 0) but exposed as an explicit argument.

Signed-off-by: Minxi Hou <houminxi@gmail.com>
Link: https://patch.msgid.link/20260522174154.720293-3-houminxi@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Minxi Hou 2026-05-23 01:41:54 +08:00 committed by Jakub Kicinski
parent b82bfddc46
commit b74e71b6a9
1 changed files with 5 additions and 0 deletions
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5
tools/net/ynl/pyynl/lib/ynl.py
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@ -682,6 +682,7 @@ class YnlFamily(SpecFamily):
ynl.ntf_subscribe(mcast_name) -- join a multicast group
ynl.ntf_listen_all_nsid() -- listen on all netns
ynl.ntf_bind(addr=(0, 0)) -- bind socket for unicast notifications
ynl.check_ntf() -- drain pending notifications
ynl.poll_ntf(duration=None) -- yield notifications
@ -767,6 +768,10 @@ class YnlFamily(SpecFamily):
return None
return None
def ntf_bind(self, addr=(0, 0)):
"""Bind socket for receiving unicast notifications."""
self.sock.bind(addr)
def set_recv_dbg(self, enabled):
self._recv_dbg = enabled