netdev - [PATCH bpf 4/7] selftests/bpf/test_offload.py: only check verifier log on verification fails

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Date:   Thu, 03 Dec 2020 22:35:21 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Romain Perier <romain.perier@...il.com>,
        Allen Pais <apais@...ux.microsoft.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Simon Horman <simon.horman@...ronome.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Jiri Benc <jbenc@...hat.com>, oss-drivers@...ronome.com,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH bpf 4/7] selftests/bpf/test_offload.py: only check verifier
 log on verification fails

From: Toke Høiland-Jørgensen <toke@...hat.com>

Since 6f8a57ccf85 ("bpf: Make verifier log more relevant by default"), the
verifier discards log messages for successfully-verified programs. This
broke test_offload.py which is looking for a verification message from the
driver callback. Change test_offload.py to use the toggle in netdevsim to
make the verification fail before looking for the verification message.

Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
 tools/testing/selftests/bpf/test_offload.py |   19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_offload.py b/tools/testing/selftests/bpf/test_offload.py
index 7afe259c785f..6f8ff2f27027 100755
--- a/tools/testing/selftests/bpf/test_offload.py
+++ b/tools/testing/selftests/bpf/test_offload.py
@@ -905,11 +905,18 @@ try:
 
     sim.tc_flush_filters()
 
+    start_test("Test TC offloads failure...")
+    sim.dfs["dev/bpf_bind_verifier_accept"] = 0
+    ret, _, err = sim.cls_bpf_add_filter(obj, verbose=True, skip_sw=True,
+                                         fail=False, include_stderr=True)
+    fail(ret == 0, "TC filter did not reject with TC offloads enabled")
+    check_verifier_log(err, "[netdevsim] Hello from netdevsim!")
+    sim.dfs["dev/bpf_bind_verifier_accept"] = 1
+
     start_test("Test TC offloads work...")
     ret, _, err = sim.cls_bpf_add_filter(obj, verbose=True, skip_sw=True,
                                          fail=False, include_stderr=True)
     fail(ret != 0, "TC filter did not load with TC offloads enabled")
-    check_verifier_log(err, "[netdevsim] Hello from netdevsim!")
 
     start_test("Test TC offload basics...")
     dfs = simdev.dfs_get_bound_progs(expected=1)
@@ -1026,6 +1033,15 @@ try:
     rm("/sys/fs/bpf/offload")
     sim.wait_for_flush()
 
+    start_test("Test XDP load failure...")
+    sim.dfs["dev/bpf_bind_verifier_accept"] = 0
+    ret, _, err = bpftool_prog_load("sample_ret0.o", "/sys/fs/bpf/offload",
+                                 dev=sim['ifname'], fail=False, include_stderr=True)
+    fail(ret == 0, "verifier should fail on load")
+    check_verifier_log(err, "[netdevsim] Hello from netdevsim!")
+    sim.dfs["dev/bpf_bind_verifier_accept"] = 1
+    sim.wait_for_flush()
+
     start_test("Test XDP offload...")
     _, _, err = sim.set_xdp(obj, "offload", verbose=True, include_stderr=True)
     ipl = sim.ip_link_show(xdp=True)
@@ -1033,7 +1049,6 @@ try:
     progs = bpftool_prog_list(expected=1)
     prog = progs[0]
     fail(link_xdp["id"] != prog["id"], "Loaded program has wrong ID")
-    check_verifier_log(err, "[netdevsim] Hello from netdevsim!")
 
     start_test("Test XDP offload is device bound...")
     dfs = simdev.dfs_get_bound_progs(expected=1)