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

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Message-Id: <20071031154301.3cc0fbb9.akpm@linux-foundation.org>
Date:	Wed, 31 Oct 2007 15:43:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	bugme-daemon@...zilla.kernel.org, dev-null@...us.net
Subject: Re: [Bugme-new] [Bug 9270] New: sunhme requires lower MTU to handle
 802.1q frames

On Wed, 31 Oct 2007 14:54:06 -0700 (PDT)
bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=9270
> 
>            Summary: sunhme requires lower MTU to handle 802.1q frames
>            Product: Drivers
>            Version: 2.5
>      KernelVersion: 2.6.18-3
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Network
>         AssignedTo: jgarzik@...ox.com
>         ReportedBy: dev-null@...us.net
> 
> 
> Most recent kernel where this bug did not occur: N/A
> Distribution: Debian 4.0r1 (Etch)
> Hardware Environment: Sun Netra T1 105
> Software Environment:
> Problem Description:
> 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.
> 
> Steps to reproduce:
> modprobe 8021q
> modprobe sunhme
> ifconfig eth0 up
> vconfig set_name_type DEV_PLUS_VID_NO_PAD
> vconfig add eth0 10
> ifconfig eth0.10 192.l68.0.1 netmask 255.255.255.252 broadcast 192.168.0.3 up
> # IP pkt size = 1496, Ethernet frame size = 1514
> ping -s 1468 -c 1 -w 1 192.168.0.2
> # IP pkt size = 1500, Ethernet frame size = 1518
> ping -s 1472 -c 1 -w 1 192.168.0.2
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