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Date: Sun, 16 Nov 2008 16:10:19 +0200
From: "Yony Yossef" <yonyossef.lists@gmail.com>
To: freebsd-hackers@freebsd.org, "Yehonatan Yossef" <yoniy@mellanox.co.il>
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Subject: VLAN offloads on FreeBSD 6.3 & 7.0
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X-List-Received-Date: Sun, 16 Nov 2008 14:10:20 -0000

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?

Thanks,
Yony