netdev - Re: [PATCH bpf-next] selftests/bpf: Fix building error when using userspace pt

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Date:   Fri, 17 Dec 2021 10:19:51 +0800
From:   Pu Lehui <pulehui@...wei.com>
To:     Daniel Borkmann <daniel@...earbox.net>, <ast@...nel.org>,
        <andrii@...nel.org>, <kafai@...com>, <songliubraving@...com>,
        <yhs@...com>, <john.fastabend@...il.com>, <kpsingh@...nel.org>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <shuah@...nel.org>
CC:     <linux-kselftest@...r.kernel.org>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next] selftests/bpf: Fix building error when using
 userspace pt_regs



On 2021/12/15 9:20, Pu Lehui wrote:
> On 2021/12/15 4:01, Daniel Borkmann wrote:
>> On 12/14/21 2:55 PM, Pu Lehui wrote:
>>> When building bpf selftests on arm64, the following error will occur:
>>>
>>> progs/loop2.c:20:7: error: incomplete definition of type 'struct
>>> user_pt_regs'
>>>
>>> Some archs, like arm64 and riscv, use userspace pt_regs in
>>> bpf_tracing.h, which causes build failure when bpf prog use
>>> macro in bpf_tracing.h. So let's use vmlinux.h directly.
>>>
>>> Signed-off-by: Pu Lehui <pulehui@...wei.com>
>>
>> Looks like this lets CI fail, did you run the selftests also with 
>> vmtest.sh to
>> double check?
>>
>> https://github.com/kernel-patches/bpf/runs/4521708490?check_suite_focus=true 
>> :
>>
>> [...]
>> #189 verif_scale_loop6:FAIL
>> libbpf: prog 'trace_virtqueue_add_sgs': BPF program load failed: 
>> Argument list too long
>> libbpf: prog 'trace_virtqueue_add_sgs': -- BEGIN PROG LOAD LOG --
>> R1 type=ctx expected=fp
>> BPF program is too large. Processed 1000001 insn
>> verification time 12250995 usec
>> stack depth 88
>> processed 1000001 insns (limit 1000000) max_states_per_insn 107 
>> total_states 21739 peak_states 2271 mark_read 6
>> -- END PROG LOAD LOG --
>> libbpf: failed to load program 'trace_virtqueue_add_sgs'
>> libbpf: failed to load object 'loop6.o'
>> scale_test:FAIL:expect_success unexpected error: -7 (errno 7)
>> Summary: 221/986 PASSED, 8 SKIPPED, 1 FAILED
>> [...]
>>
>> Please take a look and fix in your patch, thanks!
>> .
> Sorry for my negligence, I'll take a look and fix it.
> .
It seems strange that verifier think the loop can execute up to u64_max 
while I just replace the header file.
This looks very similar to the previous llvm issue, 
https://github.com/iovisor/bcc/pull/3270, but I have no idea how to locate.

Back to arm64 bpf selftest compiling problem, we can use header file 
directory generated by "make headers_install" to fix it.

--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -294,7 +294,8 @@ MENDIAN=$(if 
$(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
  CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
  BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) \
  	     -I$(INCLUDE_DIR) -I$(CURDIR) -I$(APIDIR) \
-	     -I$(abspath $(OUTPUT)/../usr/include)
+	     -I$(abspath $(OUTPUT)/../usr/include) \
+	     -I../../../../usr/include