linux-kernel - Re: test ./tools/testing/selftests/bpf/test

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Message-ID: <YxjB7RZvVrKxJ4ec@shredder>
Date:   Wed, 7 Sep 2022 19:08:13 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     "Zhou, Jie2X" <jie2x.zhou@...el.com>, kuba@...nel.org
Cc:     "andrii@...nel.org" <andrii@...nel.org>,
        "mykolal@...com" <mykolal@...com>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "martin.lau@...ux.dev" <martin.lau@...ux.dev>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "hawk@...nel.org" <hawk@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Li, Philip" <philip.li@...el.com>,
        "petrm@...dia.com" <petrm@...dia.com>
Subject: Re: test ./tools/testing/selftests/bpf/test_offload.py failed

On Wed, Sep 07, 2022 at 08:51:56AM +0000, Zhou, Jie2X wrote:
> What is the output of test_offload.py?

This output [1], but requires this [2] additional fix on top of the one
I already posted for netdevsim. Hopefully someone more familiar with
this test can comment if this is the right fix or not.

Without it, bpftool refuses to load the program [3].

[1]
# ./test_offload.py
Test destruction of generic XDP...
Test TC non-offloaded...
Test TC non-offloaded isn't getting bound...
Test TC offloads are off by default...
[...]
test_offload.py: OK
# echo $?
0

[2]
diff --git a/tools/testing/selftests/bpf/progs/sample_map_ret0.c b/tools/testing/selftests/bpf/progs/sample_map_ret0.c
index 495990d355ef..91417aae6194 100644
--- a/tools/testing/selftests/bpf/progs/sample_map_ret0.c
+++ b/tools/testing/selftests/bpf/progs/sample_map_ret0.c
@@ -17,7 +17,8 @@ struct {
 } array SEC(".maps");
 
 /* Sample program which should always load for testing control paths. */
-SEC(".text") int func()
+SEC("xdp")
+int func()
 {
 	__u64 key64 = 0;
 	__u32 key = 0;
diff --git a/tools/testing/selftests/bpf/progs/sample_ret0.c b/tools/testing/selftests/bpf/progs/sample_ret0.c
index fec99750d6ea..f51c63dd6f20 100644
--- a/tools/testing/selftests/bpf/progs/sample_ret0.c
+++ b/tools/testing/selftests/bpf/progs/sample_ret0.c
@@ -1,6 +1,9 @@
 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
 
 /* Sample program which should always load for testing control paths. */
+SEC("xdp")
 int func()
 {
 	return 0;
diff --git a/tools/testing/selftests/bpf/test_offload.py b/tools/testing/selftests/bpf/test_offload.py
index 6cd6ef9fc20b..0381f48f45a6 100755
--- a/tools/testing/selftests/bpf/test_offload.py
+++ b/tools/testing/selftests/bpf/test_offload.py
@@ -235,7 +235,7 @@ def tc(args, JSON=True, ns="", fail=True, include_stderr=False):
 def ethtool(dev, opt, args, fail=True):
     return cmd("ethtool %s %s %s" % (opt, dev["ifname"], args), fail=fail)
 
-def bpf_obj(name, sec=".text", path=bpf_test_dir,):
+def bpf_obj(name, sec="xdp", path=bpf_test_dir,):
     return "obj %s sec %s" % (os.path.join(path, name), sec)
 
 def bpf_pinned(name):

[3]
# bpftool prog load /home/idosch/code/linux/tools/testing/selftests/bpf/sample_ret0.o /sys/fs/bpf/nooffload type xdp                                                 
Error: object file doesn't contain any bpf program                                    
Warning: bpftool is now running in libbpf strict mode and has more stringent requirements about BPF programs.                                                                
If it used to work for this object file but now doesn't, see --legacy option for more details.