VLAN offloads on FreeBSD 6.3 & 7.0

[Yony Yossef]

Hi Max, do you happen to know if TSO (as other capabilities) can be
enabled on a VLAN interface?
I've already posted this question so I'm not sending this mail to the list.

On Sun, Nov 16, 2008 at 5:08 PM, Max Laier <max at love2party.net> wrote:
> 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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