netdev - Re: [PATCH 1/1] bonding: restrict up state in 802.3ad mode

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Message-ID: <568E15B6.8010301@gmail.com>
Date:	Thu, 7 Jan 2016 15:37:26 +0800
From:	zhuyj <zyjzyj2000@...il.com>
To:	Michal Kubecek <mkubecek@...e.cz>
Cc:	emil.s.tantilov@...el.com, jay.vosburgh@...onical.com,
	vfalico@...il.com, gospo@...ulusnetworks.com,
	netdev@...r.kernel.org, boris.shteinbock@...driver.com
Subject: Re: [PATCH 1/1] bonding: restrict up state in 802.3ad mode

On 01/07/2016 02:53 PM, Michal Kubecek wrote:
> On Thu, Jan 07, 2016 at 02:15:13PM +0800, zyjzyj2000@...il.com wrote:
>> From: Zhu Yanjun <yanjun.zhu@...driver.com>
>>
>> In 802.3ad mode, the speed and duplex is needed. But in some NIC,
>> there is a time span between NIC up state and getting speed and duplex.
>> As such, sometimes a slave in 802.3ad mode is in up state without
>> speed and duplex. This will make bonding in 802.3ad mode can not
>> work well.
>> To make bonding driver be compatible with more NICs, it is
>> necessary to restrict the up state in 802.3ad mode.
>>
>> Signed-off-by: Zhu Yanjun <yanjun.zhu@...driver.com>
>> ---
>>   drivers/net/bonding/bond_main.c |   11 +++++++++++
>>   1 file changed, 11 insertions(+)
>>
>> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>> index 09f8a48..7df8af5 100644
>> --- a/drivers/net/bonding/bond_main.c
>> +++ b/drivers/net/bonding/bond_main.c
>> @@ -1991,6 +1991,17 @@ static int bond_miimon_inspect(struct bonding *bond)
>>   
>>   		link_state = bond_check_dev_link(bond, slave->dev, 0);
>>   
>> +		if ((BMSR_LSTATUS == link_state) &&
>> +		    (BOND_MODE(bond) == BOND_MODE_8023AD)) {
>> +			rtnl_lock();
>> +			bond_update_speed_duplex(slave);
>> +			rtnl_unlock();
>> +			if ((slave->speed == SPEED_UNKNOWN) ||
>> +			    (slave->duplex == DUPLEX_UNKNOWN)) {
>> +				link_state = 0;
>> +				netdev_info(bond->dev, "In 802.3ad mode, it is not enough to up without speed and duplex");
> If I read this right, whenever this state (link up but speed/duplex
> unknown) is entered, you'll keep writing this message into kernel log
> every miimon milliseconds until something changes. I'm not sure how long
> a NIC can stay in such state but it might get quite annoying (even more
> if something really goes wrong and NIC stays that way which can't be
> completely ruled out, IMHO).

Sure, Thanks a lot. I want to confirm link_up without link_speed. It is 
not usual. So I think this only lasts for several seconds.
It is very important to us since it can help us to find the root cause.

Zhu Yanjun

>
>
>> +			}
>> +		}
>>   		switch (slave->link) {
>>   		case BOND_LINK_UP:
>>   			if (link_state)
> BtW, you accidentally submitted this patch twice.
>
>                                                            Michal Kubecek

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