linux-kernel - Re: [PATCH v10] lib: checksum: Use aligned accesses for ip_fast_csum and csum_ipv6

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Message-ID: <b6337a96-e434-4a72-a196-2d758f4d431c@roeck-us.net>
Date: Sun, 25 Feb 2024 07:58:07 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Charlie Jenkins <charlie@...osinc.com>,
 David Laight <David.Laight@...lab.com>, Palmer Dabbelt <palmer@...belt.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Helge Deller <deller@....de>,
 "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
 Parisc List <linux-parisc@...r.kernel.org>,
 Christophe Leroy <christophe.leroy@...roup.eu>, Arnd Bergmann <arnd@...db.de>
Cc: linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>
Subject: Re: [PATCH v10] lib: checksum: Use aligned accesses for ip_fast_csum
 and csum_ipv6_magic tests

On 2/23/24 14:11, Charlie Jenkins wrote:
> The test cases for ip_fast_csum and csum_ipv6_magic were not properly
> aligning the IP header, which were causing failures on architectures
> that do not support misaligned accesses like some ARM platforms. To
> solve this, align the data along (14 + NET_IP_ALIGN) bytes which is the
> standard alignment of an IP header and must be supported by the
> architecture.
> 
> Furthermore, all architectures except the m68k pad "struct
> csum_ipv6_magic_data" to 44 bits. To make compatible with the m68k,
> manually pad this structure to 44 bits.
> 
> Fixes: 6f4c45cbcb00 ("kunit: Add tests for csum_ipv6_magic and ip_fast_csum")
> Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> Acked-by: Palmer Dabbelt <palmer@...osinc.com>

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