netdev - Re: [PATCH net-next v2 1/1] bridge: return error code when deleting Vlan

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Date:   Sat, 14 Oct 2017 13:52:32 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Roman Mashak <mrv@...atatu.com>
Cc:     David Ahern <dsahern@...il.com>,
        David Miller <davem@...emloft.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCH net-next v2 1/1] bridge: return error code when deleting
 Vlan

On 13/10/17 19:00, Roman Mashak wrote:
> Nikolay Aleksandrov <nikolay@...ulusnetworks.com> writes:
> 
> 
> [...]
> 
>>>> Why do you want to return the error code here? Walking the code paths
>>>> seems like ENOENT or err from switchdev_port_obj_del are the 2 error
>>>> possibilities.
>>>
>>> For example, if you attempt to delete a non-existing vlan on a port,
>>> the current code succeeds and also sends event :
>>>
>>> rtnetlink_rcv_msg
>>>     rtnl_bridge_dellink
>>>        br_dellink
>>>           br_afspec
>>>              br_vlan_info
>>>
>>> int br_dellink(..)
>>> {
>>>   ...
>>>   err = br_afspec()
>>>   if (err == 0)
>>>       br_ifinfo_notify(RTM_NEWLINK, p);
>>> }
>>>
>>> This is misleading, so a proper errcode has to be produced.
>>>
>>
>> True, but you also change the expected behaviour because now a user can
>> clear all vlans with one request (1 - 4094), and after the change that
>> will fail with a partial delete if some vlan was missing.
> 
> Nikolay, would you like to have a crack at fixing this?
> 

Sure, need to finish something and will cook up a patch next week.

Thanks,
 Nik