netdev - Re: [patch net-next v3 02/17] net: make vid as a parameter for ndo_fdb_add/ndo_fdb

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Date:	Tue, 25 Nov 2014 08:01:50 -0800
From:	John Fastabend <john.r.fastabend@...el.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>,
	netdev@...r.kernel.org
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Subject: Re: [patch net-next v3 02/17] net: make vid as a parameter for ndo_fdb_add/ndo_fdb_del

On 11/25/2014 07:38 AM, Jamal Hadi Salim wrote:
> On 11/25/14 05:28, Jiri Pirko wrote:
>> Do the work of parsing NDA_VLAN directly in rtnetlink code, pass simple
>> u16 vid to drivers from there.
>>
> 
> Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
> 
> I know this maintains status quo of what is already in the kernel.
> But we need to take care of policy (pass it from user space) which
> dictates how to proceed on failure. Three possible options:
> 1) If something fails just continue with the rest of the transaction.
> Return success if at least one thing succeeds.

I'm not sure how (1) works. We can't just let user-space/management
software run along thinking its configuration is set when its
not. At least it doesn't look very appealing for the software I'm
looking at.

> 2) If something fails stop transaction and return some partial success code

Option (2) is the current behavior of fdb this is straight forward
and punts the complexity to user space. And at least the state is
always known.

> 3) If something fails undo everything that has been done and return failure.
> 

Sure this would be nice to have when doing bulk updates and is more
useful on hardware that has a commit phase where updates don't actually
occur until they are committed.

> So two bits from somewhere would be useful to send from userspace->kernel
> 

+1 for a follow up patch though.

> 
>> +static int fbd_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
> 
> typo fbd_vid_parse -> fdb_vid_parse
> 
> cheers,
> jamal
> 
> 

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