netdev - [PATCH net] tools: ynl: don't ignore errors in NLMSG

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Message-ID: <20240420020827.3288615-1-kuba@kernel.org>
Date: Fri, 19 Apr 2024 19:08:26 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	Jakub Kicinski <kuba@...nel.org>,
	donald.hunter@...il.com,
	jiri@...nulli.us,
	sdf@...gle.com
Subject: [PATCH net] tools: ynl: don't ignore errors in NLMSG_DONE messages

NLMSG_DONE contains an error code, it has to be extracted.
Prior to this change all dumps will end in success,
and in case of failure the result is silently truncated.

Fixes: e4b48ed460d3 ("tools: ynl: add a completely generic client")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: donald.hunter@...il.com
CC: jiri@...nulli.us
CC: sdf@...gle.com
---
 tools/net/ynl/lib/ynl.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index a67f7b6fef92..a9e4d588baf6 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -203,6 +203,7 @@ from .nlspec import SpecFamily
             self.done = 1
             extack_off = 20
         elif self.nl_type == Netlink.NLMSG_DONE:
+            self.error = struct.unpack("i", self.raw[0:4])[0]
             self.done = 1
             extack_off = 4
 
-- 
2.44.0