From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Thu, 25 Jan 2018 14:00:52 -0800
Subject: selftests/bpf: check for spurious extacks from the driver
Patch-mainline: v4.16-rc1
Git-commit: 2fb89a38d35bb6c935edb819d9096de455ce87cf
References: bsc#1109837

Drivers should not report errors when offload is not forced.
Check stdout and stderr for familiar messages when with no
skip flags and with skip_hw.  Check for add, replace, and
destroy.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 tools/testing/selftests/bpf/test_offload.py |   27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

--- a/tools/testing/selftests/bpf/test_offload.py
+++ b/tools/testing/selftests/bpf/test_offload.py
@@ -543,6 +543,10 @@ def check_extack(output, reference, args
 def check_extack_nsim(output, reference, args):
     check_extack(output, "Error: netdevsim: " + reference, args)
 
+def check_no_extack(res, needle):
+    fail((res[1] + res[2]).count(needle) or (res[1] + res[2]).count("Warning:"),
+         "Found '%s' in command output, leaky extack?" % (needle))
+
 def check_verifier_log(output, reference):
     lines = output.split("\n")
     for l in reversed(lines):
@@ -550,6 +554,18 @@ def check_verifier_log(output, reference
             return
     fail(True, "Missing or incorrect message from netdevsim in verifier log")
 
+def test_spurios_extack(sim, obj, skip_hw, needle):
+    res = sim.cls_bpf_add_filter(obj, prio=1, handle=1, skip_hw=skip_hw,
+                                 include_stderr=True)
+    check_no_extack(res, needle)
+    res = sim.cls_bpf_add_filter(obj, op="replace", prio=1, handle=1,
+                                 skip_hw=skip_hw, include_stderr=True)
+    check_no_extack(res, needle)
+    res = sim.cls_filter_op(op="delete", prio=1, handle=1, cls="bpf",
+                            include_stderr=True)
+    check_no_extack(res, needle)
+
+
 # Parse command line
 parser = argparse.ArgumentParser()
 parser.add_argument("--log", help="output verbose log to given file")
@@ -687,6 +703,17 @@ try:
                  (j))
         sim.cls_filter_op(op="delete", prio=1, handle=1, cls="bpf")
 
+    start_test("Test spurious extack from the driver...")
+    test_spurios_extack(sim, obj, False, "netdevsim")
+    test_spurios_extack(sim, obj, True, "netdevsim")
+
+    sim.set_ethtool_tc_offloads(False)
+
+    test_spurios_extack(sim, obj, False, "TC offload is disabled")
+    test_spurios_extack(sim, obj, True, "TC offload is disabled")
+
+    sim.set_ethtool_tc_offloads(True)
+
     sim.tc_flush_filters()
 
     start_test("Test TC offloads work...")