linux-kernel - Re: [PATCH v6 0/2] lib: checksum: Fix issues with checksum tests

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Date: Wed, 7 Feb 2024 20:15:43 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: David Laight <David.Laight@...lab.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v6 0/2] lib: checksum: Fix issues with checksum tests

On Wed, Feb 07, 2024 at 04:22:49PM -0800, Charlie Jenkins wrote:
> The ip_fast_csum and csum_ipv6_magic tests did not have the data
> types properly casted, and improperly misaligned data.
> 
> Signed-off-by: Charlie Jenkins <charlie@...osinc.com>

I still get:

Failed unit tests:
	mips:malta:checksum
	mips64:malta:checksum
	mipsel:malta:checksum
	mipsel64:malta:checksum
	parisc:B160L:checksum
	parisc:C3700:checksum
	parisc64:C3700:checksum
	sh:rts7751r2dplus_defconfig:checksum

on parisc/parisc64:

    # test_ip_fast_csum: ASSERTION FAILED at lib/checksum_kunit.c:463
    Expected ( u64)csum_result == ( u64)expected, but
        ( u64)csum_result == 33754 (0x83da)
        ( u64)expected == 10946 (0x2ac2)
    not ok 4 test_ip_fast_csum
    ok 5 test_csum_ipv6_magic
# checksum: pass:4 fail:1 skip:0 total:5
# Totals: pass:4 fail:1 skip:0 total:5

mipsel/mipsel64 (little endian):

    # test_csum_ipv6_magic: ASSERTION FAILED at lib/checksum_kunit.c:506
    Expected ( u64)csum_result == ( u64)expected, but
        ( u64)csum_result == 18588 (0x489c)
        ( u64)expected == 12357 (0x3045)
    not ok 5 test_csum_ipv6_magic
# checksum: pass:4 fail:1 skip:0 total:5
# Totals: pass:4 fail:1 skip:0 total:5

mips (big endian):

    # test_csum_ipv6_magic: ASSERTION FAILED at lib/checksum_kunit.c:506
    Expected ( u64)csum_result == ( u64)expected, but
        ( u64)csum_result == 59728 (0xe950)
        ( u64)expected == 12357 (0x3045)
    not ok 5 test_csum_ipv6_magic
# checksum: pass:4 fail:1 skip:0 total:5
# Totals: pass:4 fail:1 skip:0 total:5

I noticed that csum_result varies across tests for some reason. On parisc/parisc64
the value is unexpected but always the same.

sh (little endian; ok, this isn't entirely fair, this test wasn't enabled before):

    KTAP version 1
    # Subtest: checksum
    # module: checksum_kunit
    1..5
    # test_csum_fixed_random_inputs: ASSERTION FAILED at lib/checksum_kunit.c:370
    Expected ( u64)result == ( u64)expec, but
        ( u64)result == 53378 (0xd082)
        ( u64)expec == 33488 (0x82d0)
    not ok 1 test_csum_fixed_random_inputs
    # test_csum_all_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.c:395
    Expected ( u64)result == ( u64)expec, but
        ( u64)result == 65281 (0xff01)
        ( u64)expec == 65280 (0xff00)
    not ok 2 test_csum_all_carry_inputs
    # test_csum_no_carry_inputs: ASSERTION FAILED at lib/checksum_kunit.c:443
    Expected ( u64)result == ( u64)expec, but
        ( u64)result == 65535 (0xffff)
        ( u64)expec == 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
# Totals: pass:2 fail:3 skip:0 total:5

The result/expected values are always the same in the sh4 tests.
I'd take the test results for sh4 with a grain of salt; there is
at least some possibility that this is an emulation problem.

Guenter