linux-kernel - Re: [PATCH v7 2/2] lib: checksum: Use aligned accesses for ip_fast_csum and csum_ipv6

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Message-ID: <3e73b623-07c5-49fc-b76f-4fb3d29dd203@roeck-us.net>
Date: Tue, 13 Feb 2024 07:51:42 -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>,
	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 2/2] lib: checksum: Use aligned accesses for
 ip_fast_csum and csum_ipv6_magic tests

On Mon, Feb 12, 2024 at 12:33:05PM -0800, Charlie Jenkins wrote:
> The test cases for ip_fast_csum and csum_ipv6_magic were failing on a
> variety of architectures that are big endian or do not support
> misalgined accesses. Both of these test cases are changed to support big
> and little endian architectures.
> 
> The test for ip_fast_csum is changed to align the data along (14 +
> NET_IP_ALIGN) bytes which is the alignment of an IP header. The test for
> csum_ipv6_magic aligns the data using a struct. An extra padding field
> is added to the struct to ensure that the size of the struct is the same
> on all architectures (44 bytes).
> 
> Fixes: 6f4c45cbcb00 ("kunit: Add tests for csum_ipv6_magic and ip_fast_csum")
> Signed-off-by: Charlie Jenkins <charlie@...osinc.com>

I don't think holding this up for the sake of parisc64 (where the test
fails on qemu if the addresses are not 8-byte aligned) make sense, so
I would suggest to move forward with this patch series and address any
remaining problems separately.

Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Tested-by: Guenter Roeck <linux@...ck-us.net>

Thanks,
Guenter