Offloading MACsec when its configured over VLAN with current MACsec
TX steering rules will wrongly insert MACsec sec tag after inserting
the VLAN header leading to a ETHERNET | SECTAG | VLAN packet when
ETHERNET | VLAN | SECTAG is configured.

The above issue is due to adding the SECTAG by HW which is a later
stage compared to the VLAN header insertion stage.

Detect such a case and adjust TX steering rules to insert the
SECTAG in the correct place by using reformat_param_0 field in
the packet reformat to indicate the offset of SECTAG from end of
the MAC header to account for VLANs in granularity of 4Bytes.
Signed-off-by: Emeel Hakim <ehakim@nvidia.com>
Reviewed-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>