linux-kernel - Re: [PATCH bpf-next v4 2/2] selftests/bpf: Skip callback tests if jit is disabled in test

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Date: Tue, 16 Jan 2024 19:15:30 +0800
From: Hou Tao <houtao@...weicloud.com>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>, Alexei Starovoitov
 <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Andrii Nakryiko <andrii@...nel.org>
Cc: Eduard Zingerman <eddyz87@...il.com>,
 John Fastabend <john.fastabend@...il.com>, Jiri Olsa <jolsa@...nel.org>,
 bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v4 2/2] selftests/bpf: Skip callback tests if jit
 is disabled in test_verifier



On 1/16/2024 12:50 PM, Tiezhu Yang wrote:
> If CONFIG_BPF_JIT_ALWAYS_ON is not set and bpf_jit_enable is 0, there
> exist 6 failed tests.
>
>   [root@...ux bpf]# echo 0 > /proc/sys/net/core/bpf_jit_enable
>   [root@...ux bpf]# echo 0 > /proc/sys/kernel/unprivileged_bpf_disabled
>   [root@...ux bpf]# ./test_verifier | grep FAIL
>   #106/p inline simple bpf_loop call FAIL
>   #107/p don't inline bpf_loop call, flags non-zero FAIL
>   #108/p don't inline bpf_loop call, callback non-constant FAIL
>   #109/p bpf_loop_inline and a dead func FAIL
>   #110/p bpf_loop_inline stack locations for loop vars FAIL
>   #111/p inline bpf_loop call in a big program FAIL
>   Summary: 768 PASSED, 15 SKIPPED, 6 FAILED
>
> The test log shows that callbacks are not allowed in non-JITed programs,
> interpreter doesn't support them yet, thus these tests should be skipped
> if jit is disabled, copy some check functions from the other places under
> tools directory, and then handle this case in do_test_single().
>
> With this patch:
>
>   [root@...ux bpf]# echo 0 > /proc/sys/net/core/bpf_jit_enable
>   [root@...ux bpf]# echo 0 > /proc/sys/kernel/unprivileged_bpf_disabled
>   [root@...ux bpf]# ./test_verifier | grep FAIL
>   Summary: 768 PASSED, 21 SKIPPED, 0 FAILED
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>

Acked-by: Hou Tao <houtao1@...wei.com>