netdev - Re: [iproute2-next v4 0/2] devlink: add flash update overwrite mask

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Date:   Tue, 29 Sep 2020 11:00:01 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     David Ahern <dsahern@...il.com>, netdev@...r.kernel.org
Cc:     Jiri Pirko <jiri@...lanox.com>, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [iproute2-next v4 0/2] devlink: add flash update overwrite mask



On 9/29/2020 8:33 AM, David Ahern wrote:
> On 9/9/20 3:28 PM, Jacob Keller wrote:
>> This series implements the iproute2 side of the new
>> DEVLINK_ATTR_FLASH_UPDATE_OVERWRITE_MASK.
>>
>> This attribute is used to allow userspace to indicate what a device should
>> do with various subsections of a flash component when updating. For example,
>> a flash component might contain vital data such as the PCIe serial number or
>> configuration fields such as settings that control device bootup.
>>
>> The overwrite mask allows the user to specify what behavior they want when
>> performing an update. If nothing is specified, then the update should
>> preserve all vital fields and configuration.
>>
>> By specifying "overwrite identifiers" the user requests that the flash
>> update should overwrite any identifiers in the updated flash component with
>> identifier values from the provided flash image.
>>
>>   $devlink dev flash pci/0000:af:00.0 file flash_image.bin overwrite identifiers
>>
>> By specifying "overwrite settings" the user requests that the flash update
>> should overwrite any settings in the updated flash component with setting
>> values from the provided flash image.
>>
>>   $devlink dev flash pci/0000:af:00.0 file flash_image.bin overwrite settings
>>
>> These options may be combined, in which case both subsections will be sent
>> in the overwrite mask, resulting in a request to overwrite all settings and
>> identifiers stored in the updated flash components.
>>
>>   $devlink dev flash pci/0000:af:00.0 file flash_image.bin overwrite settings overwrite identifiers
>>
>> Cc: Jiri Pirko <jiri@...lanox.com>
>> Cc: Jakub Kicinski <kuba@...nel.org>
>>
>> Jacob Keller (2):
>>   Update devlink header for overwrite mask attribute
>>   devlink: support setting the overwrite mask
>>
>>  devlink/devlink.c            | 48 ++++++++++++++++++++++++++++++++++--
>>  include/uapi/linux/devlink.h | 27 ++++++++++++++++++++
>>  2 files changed, 73 insertions(+), 2 deletions(-)
>>
>>
>> base-commit: ad34d5fadb0b4699b0fe136fc408685e26bb1b43
>>
> 
> Jacob:
> 
> Compile fails on Ubuntu 20.04:
> 
> devlink
>     CC       devlink.o
> In file included from devlink.c:29:
> devlink.c: In function ‘flash_overwrite_section_get’:
> ../include/uapi/linux/devlink.h:249:42: warning: implicit declaration of
> function ‘_BITUL’ [-Wimplicit-function-declaration]
>   249 | #define DEVLINK_FLASH_OVERWRITE_SETTINGS
> _BITUL(DEVLINK_FLASH_OVERWRITE_SETTINGS_BIT)
>       |                                          ^~~~~~
> devlink.c:1293:12: note: in expansion of macro
> ‘DEVLINK_FLASH_OVERWRITE_SETTINGS’
>  1293 |   *mask |= DEVLINK_FLASH_OVERWRITE_SETTINGS;
>       |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>     CC       mnlg.o
>     LINK     devlink
> 
> I updated headers in -next; please redo the patch set and roll the cover
> letter details in patch 2.
> 

This appears to be because uapi/linux/const.h isn't included... I am not
sure what the correct fix here is.. should this be part of the include
chain for uapi/linux/devlink.h? I could add this to the devlink.c file
but that feels incorrect since the definition/usage is in
uapi/linux/devlink.h...

Thanks,
Jake