netdev - Re: [RFC PATCH v2 14/22] devlink: implement DEVLINK_CMD_REGION

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Date:   Mon, 2 Mar 2020 14:14:34 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, valex@...lanox.com, linyunsheng@...wei.com,
        lihong.yang@...el.com, kuba@...nel.org
Subject: Re: [RFC PATCH v2 14/22] devlink: implement DEVLINK_CMD_REGION_NEW



On 3/2/2020 9:41 AM, Jiri Pirko wrote:
> Sat, Feb 15, 2020 at 12:22:13AM CET, jacob.e.keller@...el.com wrote:
>> Implement support for the DEVLINK_CMD_REGION_NEW command for creating
>> snapshots. This new command parallels the existing
>> DEVLINK_CMD_REGION_DEL.
>>
>> In order for DEVLINK_CMD_REGION_NEW to work for a region, the new
>> ".snapshot" operation must be implemented in the region's ops structure.
>>
>> The desired snapshot id may be provided. If the requested id is already
>> in use, an error will be reported. If no id is provided one will be
>> selected in the same way as a triggered snapshot.
>>
>> In either case, the reference count for that id will be incremented
>> in the snapshot IDR.
>>
>> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
>> ---
>> .../networking/devlink/devlink-region.rst     | 12 +++-
>> include/net/devlink.h                         |  6 ++
>> net/core/devlink.c                            | 72 +++++++++++++++++++
>> 3 files changed, 88 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/networking/devlink/devlink-region.rst b/Documentation/networking/devlink/devlink-region.rst
>> index 1a7683e7acb2..a24faf2b6b7a 100644
>> --- a/Documentation/networking/devlink/devlink-region.rst
>> +++ b/Documentation/networking/devlink/devlink-region.rst
>> @@ -20,6 +20,11 @@ address regions that are otherwise inaccessible to the user.
>> Regions may also be used to provide an additional way to debug complex error
>> states, but see also :doc:`devlink-health`
>>
>> +Regions may optionally support capturing a snapshot on demand via the
>> +``DEVLINK_CMD_REGION_NEW`` netlink message. A driver wishing to allow
>> +requested snapshots must implement the ``.snapshot`` callback for the region
>> +in its ``devlink_region_ops`` structure.
>> +
>> example usage
>> -------------
>>
>> @@ -40,8 +45,11 @@ example usage
>>     # Delete a snapshot using:
>>     $ devlink region del pci/0000:00:05.0/cr-space snapshot 1
>>
>> -    # Trigger (request) a snapshot be taken:
>> -    $ devlink region trigger pci/0000:00:05.0/cr-space
> 
> Odd. It is actually "devlink region dump". There is no trigger.
> 

This appears to have happened as I was working on the original "trigger"
patches at the same time as the documentation refactor, and things must
have gotten squashed in.

I can send a separate patch to remove it with a clearer explanation.

Thanks,
Jake