netdev - Re: If bridge have no sub-interfaces, it's status may be still with 'RUNNING'

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Message-ID: <54E17853.8070106@windriver.com>
Date:	Mon, 16 Feb 2015 12:55:47 +0800
From:	yzhu1 <Yanjun.Zhu@...driver.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
CC:	netdev <netdev@...r.kernel.org>,
	"Wu, Kuaikuai" <Kuaikuai.Wu@...driver.com>,
	"Tao, Yue" <Yue.Tao@...driver.com>
Subject: Re: If bridge have no sub-interfaces, it's status may be still with
 'RUNNING'

Hi, Stephen

Follow your advice, I made a new patch. This patch will turn off
carrier when a new bridge interface is created. Please comment on it.

Thanks a lot.
Zhu Yanjun
On 02/14/2015 02:30 AM, Stephen Hemminger wrote:
> On Fri, 13 Feb 2015 17:57:45 +0800
> yzhu1 <Yanjun.Zhu@...driver.com> wrote:
>
>> Hi, all
>>
>> I made this test on ubuntu 14.04 with kernel 3,19-rc7:
>>
>> 1. brctl addbr br0
>>
>> 2. ifconfig br0 up
>>
>> 3. ifconfig br0 (br0's status is with 'RUNNING')
>>
>> 4. brctl addif br0 eth0
>>
>> 5. brctl delif br0 eth0
>>
>> 6. ifconfig br0 (br0's status is without 'RUNNING')
>>
>> When there is no sub-interface, the flag "RUNNING" is missing after the
>> last sub-interface is removed.
>>
>> As such, should we keep "RUNNING" flag after the last sub-interface is
>> removed?
> This is intentional. If there are no active ports in bridge, then
> we want to tell applications that packets will go nowhere.
>
>


View attachment "0001-bridge-turn-off-carrier-when-the-bridge-is-created.patch" of type "text/x-patch" (999 bytes)