diff mbox series

[bpf,3/3] selftests/bpf: Test gotol with large offsets

Message ID 20240102193531.3169422-4-iii@linux.ibm.com (mailing list archive)
State Accepted
Commit 63fac34669e4cc666f943173ed2aa76b8db999f0
Delegated to: BPF
Headers show
Series s390/bpf: Fix gotol with large offsets | expand

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netdev/tree_selection success Clearly marked for bpf
netdev/ynl success SINGLE THREAD; Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/cc_maintainers warning 11 maintainers not CCed: sdf@google.com haoluo@google.com martin.lau@linux.dev jolsa@kernel.org kpsingh@kernel.org shuah@kernel.org yonghong.song@linux.dev linux-kselftest@vger.kernel.org mykolal@fb.com song@kernel.org john.fastabend@gmail.com
netdev/build_clang success Errors and warnings before: 8 this patch: 8
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netdev/check_selftest success No net selftest shell script
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netdev/checkpatch warning WARNING: Avoid line continuations in quoted strings
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bpf/vmtest-bpf-VM_Test-40 success Logs for x86_64-llvm-18 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-18
bpf/vmtest-bpf-VM_Test-41 success Logs for x86_64-llvm-18 / test (test_verifier, false, 360) / test_verifier on x86_64 with llvm-18
bpf/vmtest-bpf-VM_Test-16 success Logs for s390x-gcc / test (test_verifier, false, 360) / test_verifier on s390x with gcc
bpf/vmtest-bpf-VM_Test-14 success Logs for s390x-gcc / test (test_progs, false, 360) / test_progs on s390x with gcc
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bpf/vmtest-bpf-PR fail PR summary
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Commit Message

Ilya Leoshkevich Jan. 2, 2024, 7:30 p.m. UTC 
Test gotol with offsets that don't fit into a short (i.e., larger than
32k or smaller than -32k).

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 .../selftests/bpf/progs/verifier_gotol.c      | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

Comments

Yonghong Song Jan. 3, 2024, 12:44 a.m. UTC | #1 
On 1/2/24 11:30 AM, Ilya Leoshkevich wrote:
> Test gotol with offsets that don't fit into a short (i.e., larger than
> 32k or smaller than -32k).
>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>

It might be useful to explain why the test will fail
with unpriv mode (4K insn limit) just in case that
people are not aware of the reason.

Acked-by: Yonghong Song <yonghong.song@linux.dev>

> ---
>   .../selftests/bpf/progs/verifier_gotol.c      | 19 +++++++++++++++++++
>   1 file changed, 19 insertions(+)
>
> diff --git a/tools/testing/selftests/bpf/progs/verifier_gotol.c b/tools/testing/selftests/bpf/progs/verifier_gotol.c
> index d1edbcff9a18..05a329ee45ee 100644
> --- a/tools/testing/selftests/bpf/progs/verifier_gotol.c
> +++ b/tools/testing/selftests/bpf/progs/verifier_gotol.c
> @@ -33,6 +33,25 @@ l3_%=:							\
>   	: __clobber_all);
>   }
>   
> +SEC("socket")
> +__description("gotol, large_imm")
> +__success __failure_unpriv __retval(40000)
> +__naked void gotol_large_imm(void)
> +{
> +	asm volatile ("					\
> +	gotol 1f;					\
> +0:							\
> +	r0 = 0;						\
> +	.rept 40000;					\
> +	r0 += 1;					\
> +	.endr;						\
> +	exit;						\
> +1:	gotol 0b;					\
> +"	:
> +	:
> +	: __clobber_all);
> +}
> +
>   #else
>   
>   SEC("socket")
John Fastabend Jan. 3, 2024, 6:44 p.m. UTC | #2 
Yonghong Song wrote:
> 
> On 1/2/24 11:30 AM, Ilya Leoshkevich wrote:
> > Test gotol with offsets that don't fit into a short (i.e., larger than
> > 32k or smaller than -32k).
> >
> > Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> 
> It might be useful to explain why the test will fail
> with unpriv mode (4K insn limit) just in case that
> people are not aware of the reason.
> 
> Acked-by: Yonghong Song <yonghong.song@linux.dev>
> 

Acked-by: John Fastabend <john.fastabend@gmail.com>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/verifier_gotol.c b/tools/testing/selftests/bpf/progs/verifier_gotol.c
index d1edbcff9a18..05a329ee45ee 100644
--- a/tools/testing/selftests/bpf/progs/verifier_gotol.c
+++ b/tools/testing/selftests/bpf/progs/verifier_gotol.c
@@ -33,6 +33,25 @@  l3_%=:							\
 	: __clobber_all);
 }
 
+SEC("socket")
+__description("gotol, large_imm")
+__success __failure_unpriv __retval(40000)
+__naked void gotol_large_imm(void)
+{
+	asm volatile ("					\
+	gotol 1f;					\
+0:							\
+	r0 = 0;						\
+	.rept 40000;					\
+	r0 += 1;					\
+	.endr;						\
+	exit;						\
+1:	gotol 0b;					\
+"	:
+	:
+	: __clobber_all);
+}
+
 #else
 
 SEC("socket")