linux-kernel - [RFC PATCH net] tools/net/ynl: fix cli.py --subscribe feature

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Message-Id: <20240823084220.258965-1-arkadiusz.kubalewski@intel.com>
Date: Fri, 23 Aug 2024 10:42:20 +0200
From: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
To: netdev@...r.kernel.org
Cc: donald.hunter@...il.com,
	kuba@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	jiri@...nulli.us,
	jacob.e.keller@...el.com,
	liuhangbin@...il.com,
	linux-kernel@...r.kernel.org,
	Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Subject: [RFC PATCH net] tools/net/ynl: fix cli.py --subscribe feature

Execution of command:
./tools/net/ynl/cli.py --spec Documentation/netlink/specs/dpll.yaml /
	--subscribe "monitor" --sleep 10
fails with:
Traceback (most recent call last):
  File "/root/arek/linux-dpll/./tools/net/ynl/cli.py", line 114, in <module>
    main()
  File "/root/arek/linux-dpll/./tools/net/ynl/cli.py", line 109, in main
    ynl.check_ntf()
  File "/root/arek/linux-dpll/tools/net/ynl/lib/ynl.py", line 924, in check_ntf
    op = self.rsp_by_value[nl_msg.cmd()]
KeyError: 19

The key value of 19 returned from nl_msg.cmd() is a received message
header's nl_type, which is the id value of generic netlink family being
addressed in the OS on subscribing. It is wrong to use it for decoding
the notification. Expected notification message on dpll subsystem is
DPLL_CMD_PIN_CHANGE_NTF=13, seems at that point only available as first
byte of RAW message payload, use it to target correct op and allow further
parsing.

Fixes: "0a966d606c68" ("tools/net/ynl: Fix extack decoding for directional ops")
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
---
 tools/net/ynl/lib/ynl.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index d42c1d605969..192d6c150303 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -921,7 +921,7 @@ class YnlFamily(SpecFamily):
                     print("Netlink done while checking for ntf!?")
                     continue
 
-                op = self.rsp_by_value[nl_msg.cmd()]
+                op = self.rsp_by_value[nl_msg.raw[0]]
                 decoded = self.nlproto.decode(self, nl_msg, op)
                 if decoded.cmd() not in self.async_msg_ids:
                     print("Unexpected msg id done while checking for ntf", decoded)
-- 
2.38.1