netdev - Re: [PATCH 03/15] devlink: add operation to take an immediate snapshot

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Date:   Mon, 3 Feb 2020 08:33:23 -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
Subject: Re: [PATCH 03/15] devlink: add operation to take an immediate
 snapshot

On 2/3/2020 3:50 AM, Jiri Pirko wrote:
> Thu, Jan 30, 2020 at 11:58:58PM CET, jacob.e.keller@...el.com wrote:
>> Add a new devlink command, DEVLINK_CMD_REGION_TAKE_SNAPSHOT. This
> 
> Hmm, the shapshot is now removed by user calling:
> 
> $ devlink region del DEV/REGION snapshot SNAPSHOT_ID
> That is using DEVLINK_CMD_REGION_DEL netlink command calling
> devlink_nl_cmd_region_del()
> 
> I think the creation should be symmetric. Something like:
> $ devlink region add DEV/REGION snapshot SNAPSHOT_ID
> SNAPSHOT_ID is either exact number or "any" if user does not care.
> The benefit of using user-passed ID value is that you can use this
> easily in scripts.
> 
> The existing unused netlink command DEVLINK_CMD_REGION_NEW would be used
> for this.
> 

Sure, this makes some sense. It will likely require refactoring the
snapshot id creation to handle the fact that users can choose a snapshot
id themselves.

This approach sounds like a more sound design, making the commands
symmetric and enabling easier usage from scripts.

Thanks,
Jake

> 
>>
>>     # Dump a snapshot:
>>     $ devlink region dump pci/0000:00:05.0/fw-health snapshot 1
> 
> [...]
>