netdev - Re: [PATCH] bonding: move ipoib_header

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Date:	Mon, 15 Dec 2014 09:12:53 +0800
From:	Wengang <wen.gang.wang@...cle.com>
To:	David Miller <davem@...emloft.net>, jay.vosburgh@...onical.com
CC:	ogerlitz@...lanox.com, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org
Subject: Re: [PATCH] bonding: move ipoib_header_ops to vmlinux

Anyone please respond to this?

thanks,
wengang

于 2014年12月03日 09:50, Wengang Wang 写道:
> Hi David and Jay,
>
> Then about about the change in this patch?
>
> thanks,
> wengang
>
> 在 2014年11月26日 09:30, Wengang 写道:
>> 于 2014年11月26日 02:44, David Miller 写道:
>>> From: Jay Vosburgh <jay.vosburgh@...onical.com>
>>> Date: Tue, 25 Nov 2014 10:41:17 -0800
>>>
>>>> Or Gerlitz <ogerlitz@...lanox.com> wrote:
>>>>
>>>>> On 11/25/2014 8:07 AM, David Miller wrote:
>>>>>> IPOIB should not work over bonding as it requires that the device
>>>>>> use ARPHRD_ETHER.
>>>>> Hi Dave,
>>>>>
>>>>> IPoIB devices can be enslaved to both bonding and teaming in their 
>>>>> HA mode,
>>>>> the bond device type becomes ARPHRD_INFINIBAND when this happens.
>>>>     The point was that pktgen disallows ARPHRD_INFINIBAND, not that
>>>> bonding does.
>>>>
>>>>     Pktgen specifically checks for type != ARPHRD_ETHER, so the
>>>> IPoIB bond should not be able to be used with pkgten.  My suspicion is
>>>> that pktgen is being configured on the bond first, then an IPoIB slave
>>>> is added to the bond; this would change its type in a way that pktgen
>>>> wouldn't notice.
>>> +1
>>
>> I think it go this way:
>>
>> 1) bond_master is ready
>> 2) bond_enslave enslave a IPOIB interface calling bond_setup_by_slave
>> 3) then bond_setup_by_slave set change master type to ARPHRD_INFINIBAND.
>>
>> code is like this:
>>
>> 1 /* enslave device <slave> to bond device <master> */
>> 2 int bond_enslave(struct net_device *bond_dev, struct net_device 
>> *slave_dev)
>> 3 {
>> 4 <snip>...
>> 5 /* set bonding device ether type by slave - bonding netdevices are
>> 6 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
>> 7 * there is a need to override some of the type dependent 
>> attribs/funcs.
>> 8 *
>> 9 * bond ether type mutual exclusion - don't allow slaves of dissimilar
>> 10 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the 
>> same bond
>> 11 */
>> 12 if (!bond_has_slaves(bond)) {
>> 13 if (bond_dev->type != slave_dev->type) {
>> 14 <snip>...
>> 15 if (slave_dev->type != ARPHRD_ETHER)
>> 16 bond_setup_by_slave(bond_dev, slave_dev);
>> 17 else {
>> 18 ether_setup(bond_dev);
>> 19 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
>> 20 }
>> 21
>> 22 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
>> 23 bond_dev);
>> 24 }
>> 25 <snip>...
>> 26 }
>> 27
>> 28 static void bond_setup_by_slave(struct net_device *bond_dev,
>> 29 struct net_device *slave_dev)
>> 30 {
>> 31 bond_dev->header_ops = slave_dev->header_ops;
>> 32
>> 33 bond_dev->type = slave_dev->type;
>> 34 bond_dev->hard_header_len = slave_dev->hard_header_len;
>> 35 bond_dev->addr_len = slave_dev->addr_len;
>> 36
>> 37 memcpy(bond_dev->broadcast, slave_dev->broadcast,
>> 38 slave_dev->addr_len);
>> 39 }
>> 40
>>
>> thanks
>> wengang
>> -- 
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