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

[bugme-daemon at bugzilla.kernel.org]

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 at pobox.com
        ReportedBy: dev-null at telus.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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