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

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Message-ID: <cb8d3d2a-b843-49d5-a219-10a29b5877d0@roeck-us.net>
Date: Tue, 2 Apr 2024 07:06:09 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	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,

On Mon, Mar 25, 2024 at 07:34:00AM -0700, Guenter Roeck wrote:
> On 3/25/24 00:39, John Paul Adrian Glaubitz wrote:
> > 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?
> > 
> 
> Enabling CONFIG_KUNIT and CHECKSUM_KUNIT and booting with those tests enabled
> should do it.
> 

Did you have time to test this on real hardware ?

Thanks,
Guenter