linux-kernel - Re: [PATCH] Revert "sh: Handle calling csum

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Date: Mon, 25 Mar 2024 08:39:39 +0100
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Guenter Roeck <linux@...ck-us.net>, Yoshinori Sato
	 <ysato@...rs.sourceforge.jp>
Cc: Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "sh: Handle calling csum_partial with misaligned
 data"

Hi Guenter,

On Sun, 2024-03-24 at 16:18 -0700, Guenter Roeck wrote:
> This reverts commit cadc4e1a2b4d20d0cc0e81f2c6ba0588775e54e5.
> 
> Commit cadc4e1a2b4d ("sh: Handle calling csum_partial with misaligned
> data") causes bad checksum calculations on unaligned data. Reverting
> it fixes the problem.
> 
>     # Subtest: checksum
>     # module: checksum_kunit
>     1..5
>     # test_csum_fixed_random_inputs: ASSERTION FAILED at lib/checksum_kunit.c:500
>     Expected ( u64)result == ( u64)expec, but
>         ( u64)result == 53378 (0xd082)
>         ( u64)expec == 33488 (0x82d0)
>     # test_csum_fixed_random_inputs: pass:0 fail:1 skip:0 total:1
>     not ok 1 test_csum_fixed_random_inputs
>     # test_csum_all_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.c:525
>     Expected ( u64)result == ( u64)expec, but
>         ( u64)result == 65281 (0xff01)
>         ( u64)expec == 65280 (0xff00)
>     # test_csum_all_carry_inputs: pass:0 fail:1 skip:0 total:1
>     not ok 2 test_csum_all_carry_inputs
>     # test_csum_no_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.c:573
>     Expected ( u64)result == ( u64)expec, but
>         ( u64)result == 65535 (0xffff)
>         ( u64)expec == 65534 (0xfffe)
>     # test_csum_no_carry_inputs: pass:0 fail:1 skip:0 total:1
>     not ok 3 test_csum_no_carry_inputs
>     # test_ip_fast_csum: pass:1 fail:0 skip:0 total:1
>     ok 4 test_ip_fast_csum
>     # test_csum_ipv6_magic: pass:1 fail:0 skip:0 total:1
>     ok 5 test_csum_ipv6_magic
>  # checksum: pass:2 fail:3 skip:0 total:5
>  # Totals: pass:2 fail:3 skip:0 total:5
> not ok 22 checksum

Can you tell me how the tests are run so I can try to verify this on real hardware?

Adrian

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