netdev - Re: [patch net-next-2.6 V3] net: convert bonding to use rx

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Date:	Sun, 27 Feb 2011 21:59:24 +0100
From:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
To:	Jiri Pirko <jpirko@...hat.com>
CC:	David Miller <davem@...emloft.net>, kaber@...sh.net,
	eric.dumazet@...il.com, netdev@...r.kernel.org,
	shemminger@...ux-foundation.org, fubar@...ibm.com,
	andy@...yhouse.net
Subject: Re: [patch net-next-2.6 V3] net: convert bonding to use rx_handler

Le 27/02/2011 21:06, Jiri Pirko a écrit :
> Sun, Feb 27, 2011 at 03:17:01PM CET, nicolas.2p.debian@...il.com wrote:

>>> +	if (bond_should_deliver_exact_match(skb, slave_dev, bond_dev)) {
>>> +		skb->deliver_no_wcard = 1;
>>> +		return skb;
>>
>> Shouldn't we return NULL here ?
>
> No we shouldn't. We need sbk to be delivered to exact match.

So, if I understand properly:

- If skb->dev changed, loop,
- else, if skb->deliver_no_wcard, do exact match delivery only,
- Else, if !skb, drop the frame, without ever exact match delivery,
- Else, do normal delivery.

Right?

>> The vlan_on_bond case used to be cost effective. Now, we clone the skb and call netif_rx...
>
> This should not cost too much overhead considering only few packets are
> going thru this. This hook shouldn't have exited in the fisrt place. I
> think introducing this functionality was a big mistake.

What would you have proposed instead?

Anyway, I think the feature is broken, because it wouldn't provide the expected effect on the 
following configuration:

eth0/eth1 -> bond0 -> br0 -> br0.100.

We probably need a more general way to fix this, after your patch have been accepted.

[snip]

>> I would instead consider NULL as meaning exact-match-delivery-only.
>> (The same effect as dev_bond_should_drop() returning true).
>
> we can change the behaviour later on.

Agreed.

	Nicolas.
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