netdev - RE: [PATCH v2 11/14] bnx2x: Update bnx2x to use new vlan accleration.

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Date:	Tue, 26 Oct 2010 02:14:43 -0700
From:	"Vladislav Zolotarov" <vladz@...adcom.com>
To:	"Jesse Gross" <jesse@...ira.com>
cc:	"David Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Hao Zheng" <hzheng@...ira.com>,
	"Eilon Greenstein" <eilong@...adcom.com>
Subject: RE: [PATCH v2 11/14] bnx2x: Update bnx2x to use new vlan
 accleration.

> 
> Even though the fix prevents the panic, I'm still a little concerned
> that you ran into it at all when vlan stripping was disabled.  That
> function should only be called when a tag was received by the card.
> Is it possible that __vlan_hwaccel_put_tag is being called even in
> cases when no tag was stripped?  

Correct, and that's because u've patched the driver to put it the
following way:

if (le16_to_cpu(cqe->fast_path_cqe.pars_flags.flags) &
                     PARSING_FLAGS_VLAN)
        __vlan_hwaccel_put_tag(skb, le16_to_cpu(cqe->fast_path_cqe.vlan_tag));

The condition above will be TRUE regardless VLAN stripping is enabled or
disabled as the parsing flags come from our PARSER HW block and simply
indicates whether this frame has a VLAN header or not. When I disabled a VLAN
stripping I should have fixed this lines too but I think I didn't... ;)

> Maybe we made a mistake when converting the driver?

Since the driver always configures the VLAN stripping now, regardless the kernel
configuration, I think your patch was just fine. ;)

Thanks,
vlad

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