netdev - Re: [Bugme-new] [Bug 9270] New: sunhme requires lower MTU to handle 802.1q frames

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Date:	Thu, 1 Nov 2007 12:12:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	dev-null@...us.net, jeff@...zik.org
Subject: Re: [Bugme-new] [Bug 9270] New: sunhme requires lower MTU to handle
 802.1q frames

On Wed, 31 Oct 2007 16:35:57 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Andrew Morton <akpm@...ux-foundation.org>
> Date: Wed, 31 Oct 2007 15:43:01 -0700
> 
> > > sunhme requires lower MTU to handle 802.1q frames - even though the PCI
> > > driver supported VLAN tagging, you cannot do full MTU @ 1500 because the
> > > driver doesn't set the card to transfer more the extra bytes for a 802.1q
> > > frame at 1500 MTU.
> 
> It supports VLAN tagging by accident, the NETIF_F_VLAN_CHALLENGED
> flag should be set both in the PCI and non-PCI cases.
> 
> Jeff, please apply, thanks:
> 
> [SUNHME]: Fix missing NETIF_F_VLAN_CHALLENGED on PCI happy meals.
> 
> No HME parts can do VLANs correctly.
> 
> Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> diff --git a/drivers/net/sunhme.c b/drivers/net/sunhme.c
> index 120c8af..c20a3bd 100644
> --- a/drivers/net/sunhme.c
> +++ b/drivers/net/sunhme.c
> @@ -3143,8 +3143,8 @@ static int __devinit happy_meal_pci_probe(struct pci_dev *pdev,
>  	dev->irq = pdev->irq;
>  	dev->dma = 0;
>  
> -	/* Happy Meal can do it all... */
> -	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
> +	/* Happy Meal can do it all... except VLAN. */
> +	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_VLAN_CHALLENGED;
>  
>  #if defined(CONFIG_SBUS) && defined(CONFIG_PCI)
>  	/* Hook up PCI register/dma accessors. */

I forgot to add my standard "please reply via emailed reply-to-all, not via
the bugzilla web interface", so Chris has gone and attempted to communicate
with us via the bugzilla UI (sigh).

He asked

"Even though it appears to work after I bumped the BMAC_TXMAX / BMAC_RXMAX?"


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