VLAN offloads on FreeBSD 6.3 & 7.0

[Max Laier]

On Sunday 16 November 2008 15:10:19 Yony Yossef wrote:
> Hi All,
>
> I'm working on an Ethernet driver for FreeBSD, currently implementing
> VLAN offloads.
> I have two problems, one is enabling TSO over the VLAN interface and
> the second is enabling the VLAN filtering offload.
>
> About the TSO problem, I'm currently suffering a hugh performance
> penalty since I have no TSO enabled over my vlan interfaces.
> When I create a VLAN interface it does not inherit the features of
> it's mother-interface, e.g. IFCAP_TSO.
> Can it be done on FreeBSD 6.3 / 7.0 ?
>
> Second, my NIC is capable of holding a vlan table on HW, filtering
> vlans on it's own, now I need to find a way to update that HW table
> with added/deleted VLANs in order to use that VLAN filtering offload.
> One way is to recieve a ioctl from the OS of it's vlan table events
> (add, remove). I can't find such ioctl.
>
> Second way is to have direct access from the driver to the OS vlan
> table. I'm not familiar with the interface though (something parallel
> to vlan_group_get_device on linux) or if it's possible at all, can
> anyone help on this one?

See http://svn.freebsd.org/viewvc/base?view=revision&revision=180510 for the 
VLAN tag issue.  Simply EVENTHANDLER_REGISTER a function in your driver to 
update the hw-table on config/unconfig events.  I hope this helps.

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