netdev - [PATCH net-next] selftests: net: bpf_offload: print loaded programs on mismatch

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Message-ID: <20250819073348.387972-1-liuhangbin@gmail.com>
Date: Tue, 19 Aug 2025 07:33:48 +0000
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Andrii Nakryiko <andriin@...com>,
	Jussi Maki <joamaki@...il.com>,
	Jay Vosburgh <jv@...sburgh.net>,
	Andy Gospodarek <andy@...yhouse.net>,
	Jonathan Corbet <corbet@....net>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Toke Høiland-Jørgensen <toke@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Felix Maurer <fmaurer@...hat.com>,
	Viktor Malik <vmalik@...hat.com>,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH net-next] selftests: net: bpf_offload: print loaded programs on mismatch

The test sometimes fails due to an unexpected number of loaded programs. e.g

  FAIL: 2 BPF programs loaded, expected 1
    File "/usr/libexec/kselftests/net/./bpf_offload.py", line 940, in <module>
      progs = bpftool_prog_list(expected=1)
    File "/usr/libexec/kselftests/net/./bpf_offload.py", line 187, in bpftool_prog_list
      fail(True, "%d BPF programs loaded, expected %d" %
    File "/usr/libexec/kselftests/net/./bpf_offload.py", line 89, in fail
      tb = "".join(traceback.extract_stack().format())

However, the logs do not show which programs were actually loaded, making it
difficult to debug the failure.

Add printing of the loaded programs when a mismatch is detected to help
troubleshoot such errors. The list is printed on a new line to avoid breaking
the current log format.

Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 tools/testing/selftests/net/bpf_offload.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/bpf_offload.py b/tools/testing/selftests/net/bpf_offload.py
index b2c271b79240..c856d266c8f3 100755
--- a/tools/testing/selftests/net/bpf_offload.py
+++ b/tools/testing/selftests/net/bpf_offload.py
@@ -184,8 +184,8 @@ def bpftool_prog_list(expected=None, ns="", exclude_orphaned=True):
         progs = [ p for p in progs if not p['orphaned'] ]
     if expected is not None:
         if len(progs) != expected:
-            fail(True, "%d BPF programs loaded, expected %d" %
-                 (len(progs), expected))
+            fail(True, "%d BPF programs loaded, expected %d\nLoaded Progs:\n%s" %
+                 (len(progs), expected, pp.pformat(progs)))
     return progs
 
 def bpftool_map_list(expected=None, ns=""):
-- 
2.50.1