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Bug 679188 - gpxe virtio-net driver incorrectly hardcodes frame length always as 1514
Summary: gpxe virtio-net driver incorrectly hardcodes frame length always as 1514
Keywords:
Status: CLOSED DUPLICATE of bug 672529
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: gpxe
Version: 6.0
Hardware: All
OS: All
unspecified
medium
Target Milestone: rc
: ---
Assignee: john cooper
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On: 678789
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-02-21 20:29 UTC by Matt Domsch
Modified: 2014-07-25 03:46 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of: 678789
Environment:
Last Closed: 2011-03-09 16:31:01 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Matt Domsch 2011-02-21 20:29:27 UTC 
+++ This bug was initially created as a clone of Bug #678789 +++

Created attachment 479710 [details]
virtio-net: set size of transmitted ethernet frame to header + data length

Description of problem:

All ethernet frames sent by gpxe's virtio-net driver have a length of 1514, regardless of the actual size needed to encapsulate the data.  This messes up at least DHCP on some networks, because the DHCP relay agent can't manipulate the "full" ethernet frame.  This was causing KVM PXE failures for me since the DHCP transaction wouldn't complete.

Version-Release number of selected component (if applicable):
gpxe-1.0.1-1

How reproducible:
always

Steps to Reproduce:
1. Use virt-manager to create a VM with network driver virtio
2. Try to PXE boot the VM
3. Monitor the traffic--all frames have an ethernet length of 1514
  
Actual results:
fail to boot via PXE

Expected results:
Should boot via PXE.  virtio-net should set the ethernet frame length to the actual size of the data to be sent + headers.

Additional info:
See attached patch for the fix.

--- Additional comment from cra on 2011-02-19 12:29:03 EST ---

Same fix needs to be applied to F13, F14, F15, rawhide/F16, and EL5 branches.  Thanks.

--- Additional comment from lfarkas on 2011-02-20 15:05:37 EST ---

what's up with el6?

--- Additional comment from cra on 2011-02-21 11:58:13 EST ---

Same bug exists in el6.  Could someone who has a RHEL subscription please open a ticket?  Thanks.
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