netdev - Re: [patch net-next-2.6 37/47] igb: do vlan cleanup

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Date:	Wed, 20 Jul 2011 21:10:49 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	Jesse Gross <jesse@...ira.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	shemminger@...ux-foundation.org, eric.dumazet@...il.com,
	greearb@...delatech.com, mirqus@...il.com,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	peter.p.waskiewicz.jr@...el.com, bruce.w.allan@...el.com,
	carolyn.wyborny@...el.com, donald.c.skidmore@...el.com,
	gregory.v.rose@...el.com, alexander.h.duyck@...el.com,
	john.ronciak@...el.com, e1000-devel@...ts.sourceforge.net
Subject: Re: [patch net-next-2.6 37/47] igb: do vlan cleanup

Wed, Jul 20, 2011 at 07:35:33PM CEST, jesse@...ira.com wrote:
>On Wed, Jul 20, 2011 at 7:54 AM, Jiri Pirko <jpirko@...hat.com> wrote:
>> @@ -2943,7 +2944,7 @@ static void igb_rlpml_set(struct igb_adapter *adapter)
>>        struct e1000_hw *hw = &adapter->hw;
>>        u16 pf_id = adapter->vfs_allocated_count;
>>
>> -       if (adapter->vlgrp)
>> +       if (igb_vlan_used(adapter))
>>                max_frame_size += VLAN_TAG_SIZE;
>
>There are similar issues here as with the VF driver.  I think you're
>also confusing vlan acceleration with vlan filtering.  If no vlan
>filters are in use but the card is in promiscuous mode, the buffer
>will be undersized and we lose tagged packets.

I'm certainly not confusing vlan accel and filtering. Here is the
intension is the behaviour remains intact as well. I believe it's true.

>
>> +static void igb_vlan_mode(struct net_device *netdev, bool vlan_on)
>>  {
>>        struct igb_adapter *adapter = netdev_priv(netdev);
>>        struct e1000_hw *hw = &adapter->hw;
>>        u32 ctrl, rctl;
>>
>>        igb_irq_disable(adapter);
>> -       adapter->vlgrp = grp;
>>
>> -       if (grp) {
>> +       if (vlan_on) {
>>                /* enable VLAN tag insert/strip */
>
>This should be controlled by ethtool, not by whether vlan filters are
>enabled.  Essentially, with this, you are recreating the logic of the
>old vlan model in the new one.
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