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Message-ID: <aedf7b7f39f820de555f1c41b6a8d663738eb3a2.camel@physik.fu-berlin.de>
Subject: Re: Problems with csum_partial with misaligned buffers on sh4
 platform
From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
To: Guenter Roeck <linux@roeck-us.net>, Yoshinori Sato
	 <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>, linux-sh@vger.kernel.org, 
	linux-kernel@vger.kernel.org
Date: Sat, 10 Feb 2024 21:12:55 +0100
In-Reply-To: <65ed7c95-712c-410b-84f3-58496b0c9649@roeck-us.net>
References: <65ed7c95-712c-410b-84f3-58496b0c9649@roeck-us.net>
Autocrypt: addr=glaubitz@physik.fu-berlin.de; prefer-encrypt=mutual;
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Hi Guenter,

On Sat, 2024-02-10 at 07:12 -0800, Guenter Roeck wrote:
> when running checksum unit tests on sh4 qemu emulations, I get the follow=
ing
> errors.
>=20
>     KTAP version 1
>     # Subtest: checksum
>     # module: checksum_kunit
>     1..5
>     # test_csum_fixed_random_inputs: ASSERTION FAILED at lib/checksum_kun=
it.c:500
>     Expected ( u64)result =3D=3D ( u64)expec, but
>         ( u64)result =3D=3D 53378 (0xd082)
>         ( u64)expec =3D=3D 33488 (0x82d0)
>     not ok 1 test_csum_fixed_random_inputs
>     # test_csum_all_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.=
c:525
>     Expected ( u64)result =3D=3D ( u64)expec, but
>         ( u64)result =3D=3D 65281 (0xff01)
>         ( u64)expec =3D=3D 65280 (0xff00)
>     not ok 2 test_csum_all_carry_inputs
>     # test_csum_no_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.c=
:573
>     Expected ( u64)result =3D=3D ( u64)expec, but
>         ( u64)result =3D=3D 65535 (0xffff)
>         ( u64)expec =3D=3D 65534 (0xfffe)
>     not ok 3 test_csum_no_carry_inputs
>     ok 4 test_ip_fast_csum
>     ok 5 test_csum_ipv6_magic
> # checksum: pass:2 fail:3 skip:0 total:5
>=20
> The above is with from a little endian system. On a big endian system,
> the test result is as follows.
>=20
>     KTAP version 1
>     # Subtest: checksum
>     # module: checksum_kunit
>     1..5
>     # test_csum_fixed_random_inputs: ASSERTION FAILED at lib/checksum_kun=
it.c:500
>     Expected ( u64)result =3D=3D ( u64)expec, but
>         ( u64)result =3D=3D 33488 (0x82d0)
>         ( u64)expec =3D=3D 53378 (0xd082)
>     not ok 1 test_csum_fixed_random_inputs
>     # test_csum_all_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.=
c:525
>     Expected ( u64)result =3D=3D ( u64)expec, but
>         ( u64)result =3D=3D 65281 (0xff01)
>         ( u64)expec =3D=3D 255 (0xff)
>     not ok 2 test_csum_all_carry_inputs
>     # test_csum_no_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.c=
:565
>     Expected ( u64)result =3D=3D ( u64)expec, but
>         ( u64)result =3D=3D 1020 (0x3fc)
>         ( u64)expec =3D=3D 0 (0x0)
>     not ok 3 test_csum_no_carry_inputs
>     # test_ip_fast_csum: ASSERTION FAILED at lib/checksum_kunit.c:589
>     Expected ( u64)expected =3D=3D ( u64)csum_result, but
>         ( u64)expected =3D=3D 55939 (0xda83)
>         ( u64)csum_result =3D=3D 33754 (0x83da)
>     not ok 4 test_ip_fast_csum
>     # test_csum_ipv6_magic: ASSERTION FAILED at lib/checksum_kunit.c:617
>     Expected ( u64)expected_csum_ipv6_magic[i] =3D=3D ( u64)csum_ipv6_mag=
ic(saddr, daddr, len, proto, csum), but
>         ( u64)expected_csum_ipv6_magic[i] =3D=3D 6356 (0x18d4)
>         ( u64)csum_ipv6_magic(saddr, daddr, len, proto, csum) =3D=3D 4358=
6 (0xaa42)
>     not ok 5 test_csum_ipv6_magic
> # checksum: pass:0 fail:5 skip:0 total:5
>=20
> Note that test_ip_fast_csum and test_csum_ipv6_magic fail on all big endi=
an
> systems due to a bug in the test code, unrelated to this problem.
>=20
> Analysis shows that the errors are seen only if the buffer is misaligned.
> Looking into arch/sh/lib/checksum.S, I found commit cadc4e1a2b4d2 ("sh:
> Handle calling csum_partial with misaligned data") which seemed to be
> related. Reverting that commit fixes the problem.
> This suggests that something may be wrong with that commit. Alternatively=
,
> of course, it may be possible that something is wrong with the qemu
> emulation, but that seems unlikely.

I have not run these tests before. Can you tell me how these are run,
so I can verify these reproduce on real hardware?

Adrian

--=20
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913