netdev - Re: [PATCH net] net: ipa: Use the correct value for IPA_STATUS

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Date: Tue, 30 May 2023 07:29:36 -0500
From: Alex Elder <elder@...aro.org>
To: Bert Karwatzki <spasswolf@....de>,
 Simon Horman <simon.horman@...igine.com>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: ipa: Use the correct value for IPA_STATUS_SIZE

On 5/30/23 4:10 AM, Bert Karwatzki wrote:
> Am Dienstag, dem 30.05.2023 um 09:09 +0200 schrieb Simon Horman:
>> On Sat, May 27, 2023 at 10:46:25PM +0200, Bert Karwatzki wrote:
>>> commit b8dc7d0eea5a7709bb534f1b3ca70d2d7de0b42c introduced
>>> IPA_STATUS_SIZE as a replacement for the size of the removed struct
>>> ipa_status. sizeof(struct ipa_status) was sizeof(__le32[8]), use this
>>> as IPA_STATUS_SIZE.

This is better, however it really isn't done in a way that's
appropriate for a Linux kernel patch.  I will gladly help you
get it right if you have the patience for that.  But I'm not
going to say anything yet--until you say you want me to help
you do this.  If you prefer, I can submit the patch for you.

The reason this is important is your commit is permanent, and
just like code, commit messages are best if kept consistent
and readable.  I also am offering to help you understand so
you avoid any trouble next time you want to send a kernel patch.

Let me know what you prefer.

					-Alex

>>>
>>>>  From 0623148733819bb5d3648b1ed404d57c8b6b31d8 Mon Sep 17 00:00:00 2001
>>> From: Bert Karwatzki <spasswolf@....de>
>>> Date: Sat, 27 May 2023 22:16:52 +0200
>>> Subject: [PATCH] Use the correct value for IPA_STATUS_SIZE.
>>> IPA_STATUS_SIZE
>>>   was introduced in commit b8dc7d0eea5a7709bb534f1b3ca70d2d7de0b42c as a
>>>   replacment for the size of the removed struct ipa_status which had
>>> size =
>>>   sizeof(__le32[8]).
>>>
>>> Signed-off-by: Bert Karwatzki <spasswolf@....de>
>>
>> Hi Bert,
>>
>> As well as the feedback provided by Jakub elsewhere in this
>> thread I think it would be useful to CC the author of the above mentioned
>> commit, Alex Elder <elder@...aro.org>. I have CCed him on this email.
>> Please consider doing likewise when you post v2.
>>
>> FWIIW, I did take a look.
>> And I do agree with your maths: struct ipa_status was 32 (= 8 x 4) bytes long.
>>
>>> ---
>>>   drivers/net/ipa/ipa_endpoint.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/ipa/ipa_endpoint.c
>>> b/drivers/net/ipa/ipa_endpoint.c
>>> index 2ee80ed140b7..afa1d56d9095 100644
>>> --- a/drivers/net/ipa/ipa_endpoint.c
>>> +++ b/drivers/net/ipa/ipa_endpoint.c
>>> @@ -119,7 +119,7 @@ enum ipa_status_field_id {
>>>   };
>>>   
>>>   /* Size in bytes of an IPA packet status structure */
>>> -#define IPA_STATUS_SIZE                        sizeof(__le32[4])
>>> +#define IPA_STATUS_SIZE                        sizeof(__le32[8])
>>>   
>>>   /* IPA status structure decoder; looks up field values for a structure
>>> */
>>>   static u32 ipa_status_extract(struct ipa *ipa, const void *data,
>>> -- 
>>> 2.40.1
>>>
>>> Bert Karwatzki
> 
> Here is v2 of the patch, the first one was garbled by the linebreak setting of
> evolution.
> 
> From: Bert Karwatzki <spasswolf@....de>
> Date: Tue, 30 May 2023 10:55:55 +0200
> Subject: [PATCH] IPA_STATUS_SIZE was introduced in commit b8dc7d0eea5a as a
>   replacement for the size of the removed struct ipa_status of size
>   sizeof(__le32[8]). Use this value as IPA_STATUS_SIZE.
> 
> Signed-off-by: Bert Karwatzki <spasswolf@....de>
> ---
>   drivers/net/ipa/ipa_endpoint.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
> index 2ee80ed140b7..afa1d56d9095 100644
> --- a/drivers/net/ipa/ipa_endpoint.c
> +++ b/drivers/net/ipa/ipa_endpoint.c
> @@ -119,7 +119,7 @@ enum ipa_status_field_id {
>   };
>   
>   /* Size in bytes of an IPA packet status structure */
> -#define IPA_STATUS_SIZE			sizeof(__le32[4])
> +#define IPA_STATUS_SIZE			sizeof(__le32[8])
>   
>   /* IPA status structure decoder; looks up field values for a structure */
>   static u32 ipa_status_extract(struct ipa *ipa, const void *data,