From: Guenter Roeck <linux@roeck-us.net>
To: David Laight <David.Laight@ACULAB.COM>,
'Christophe Leroy' <christophe.leroy@csgroup.eu>,
Charlie Jenkins <charlie@rivosinc.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Andrew Morton <akpm@linux-foundation.org>,
Helge Deller <deller@gmx.de>,
"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
Parisc List <linux-parisc@vger.kernel.org>,
Al Viro <viro@zeniv.linux.org.uk>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v9 2/2] lib: checksum: Use aligned accesses for ip_fast_csum and csum_ipv6_magic tests
Date: Fri, 23 Feb 2024 06:49:41 -0800 [thread overview]
Message-ID: <7ee8130c-e27f-42c7-af8e-a0a89bcf78a4@roeck-us.net> (raw)
In-Reply-To: <fa37be6a8c014d39ab75978e10995ca8@AcuMS.aculab.com>
On 2/23/24 02:28, David Laight wrote:
> From: Christophe Leroy
>> Sent: 23 February 2024 10:07
> ...
>>> +/* Ethernet headers are 14 bytes and NET_IP_ALIGN is used to align them */
>>> +#define IP_ALIGNMENT (14 + NET_IP_ALIGN)
>>
>> Only if no VLAN.
>>
>> When using VLANs it is 4 bytes more. But why do you mind that at all ?
>
> Wasn't one architecture faulting on a double-register read?
> Where that had to be aligned (probably 8 bytes) but a normal
> memory read could be misaligned?
>
That was hppa64, and the problem was with its qemu emulation,
not with this code.
Guenter
next prev parent reply other threads:[~2024-02-23 14:50 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240221-fix_sparse_errors_checksum_tests-v9-0-bff4d73ab9d1@rivosinc.com>
[not found] ` <20240221-fix_sparse_errors_checksum_tests-v9-1-bff4d73ab9d1@rivosinc.com>
2024-02-23 9:13 ` [PATCH v9 1/2] lib: checksum: Fix type casting in checksum kunits Christophe Leroy
[not found] ` <20240221-fix_sparse_errors_checksum_tests-v9-2-bff4d73ab9d1@rivosinc.com>
2024-02-23 10:06 ` [PATCH v9 2/2] lib: checksum: Use aligned accesses for ip_fast_csum and csum_ipv6_magic tests Christophe Leroy
2024-02-23 10:28 ` David Laight
2024-02-23 14:49 ` Guenter Roeck [this message]
2024-02-23 17:54 ` Charlie Jenkins
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