netdev - Re: [RFC PATCH v2 11/22] devlink: add functions to take snapshot while locked

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Date:   Tue, 3 Mar 2020 09:41:25 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     netdev@...r.kernel.org, valex@...lanox.com, linyunsheng@...wei.com,
        lihong.yang@...el.com, kuba@...nel.org
Subject: Re: [RFC PATCH v2 11/22] devlink: add functions to take snapshot
 while locked

Mon, Mar 02, 2020 at 11:25:16PM CET, jacob.e.keller@...el.com wrote:
>
>
>On 3/2/2020 9:43 AM, Jiri Pirko wrote:
>> Sat, Feb 15, 2020 at 12:22:10AM CET, jacob.e.keller@...el.com wrote:
>>> A future change is going to add a new devlink command to request
>>> a snapshot on demand. This function will want to call the
>>> devlink_region_snapshot_id_get and devlink_region_snapshot_create
>>> functions while already holding the devlink instance lock.
>>>
>>> Extract the logic of these two functions into static functions prefixed
>>> by `__` to indicate they are internal helper functions. Modify the
>>> original functions to be implemented in terms of the new locked
>>> functions.
>>>
>>> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
>> 
>> Reviewed-by: Jiri Pirko <jiri@...lanox.com>
>> 
>> 
>>> ---
>>> net/core/devlink.c | 93 ++++++++++++++++++++++++++++++----------------
>>> 1 file changed, 61 insertions(+), 32 deletions(-)
>>>
>>> diff --git a/net/core/devlink.c b/net/core/devlink.c
>>> index fef93f48028c..0e94887713f4 100644
>>> --- a/net/core/devlink.c
>>> +++ b/net/core/devlink.c
>>> @@ -3760,6 +3760,65 @@ static void devlink_nl_region_notify(struct devlink_region *region,
>>> 	nlmsg_free(msg);
>>> }
>>>
>>> +/**
>>> + *	__devlink_region_snapshot_id_get - get snapshot ID
>>> + *	@devlink: devlink instance
>>> + *
>>> + *	Returns a new snapshot id. Must be called while holding the
>>> + *	devlink instance lock.
>>> + */
>> 
>> You don't need this docu comment for static functions.
>> 
>> 
>
>I like having these for all functions. I'll remove it if you feel
>strongly, though.

Nope. I just wanted to note you don't have to do it.


>
>Thanks,
>Jake