On Wed, Mar 16, 2011 at 02:18:55PM -0700, Jesse Gross wrote: > On Tue, Mar 15, 2011 at 12:18 PM, Ben Pfaff <[email protected]> wrote: > > Some Linux network drivers support a feature called "VLAN acceleration", > > associated with a data structure called a "vlan_group". ?A vlan_group is, > > abstractly, a dictionary that maps from a VLAN ID (in the range 0...4095) > > to a VLAN device, that is, a Linux network device associated with a > > particular VLAN, e.g. "eth0.9" for VLAN 9 on eth0. > > > > Some drivers that support VLAN acceleration have bugs that fall roughly > > into the following categories: > > > > ? ?* Some NICs strip VLAN tags on receive if no vlan_group is registered, > > ? ? ?so that the tag is completely lost. > > > > ? ?* Some drivers size their receive buffers based on whether a vlan_group > > ? ? ?is enabled, meaning that a maximum size packet with a VLAN tag will > > ? ? ?not fit if a vlan_group is not configured. > > > > ? ?* On transmit some drivers expect that VLAN acceleration will be used > > ? ? ?if it is available (which can only be done if a vlan_group is > > ? ? ?configured). ?In these cases, the driver may fail to parse the packet > > ? ? ?and correctly setup checksum offloading and/or TSO. > > > > The correct long term solution is to fix these driver bugs. ?To cope until > > then, we have prepared a patch to the Linux kernel network stack that works > > around these problems. ?This commit adds support for the workaround > > implemented by that patch. > > > > Signed-off-by: Ben Pfaff <[email protected]> > > Acked-by: Jesse Gross <[email protected]>
Thank you. I pushed this out. _______________________________________________ dev mailing list [email protected] http://openvswitch.org/mailman/listinfo/dev
