datapath: Account for "udptunnels: Call handle_offloads after inserting vlan tag."

datapath: Account for "udptunnels: Call handle_offloads after inserting vlan tag."

Upstream commit:
    udptunnels: Call handle_offloads after inserting vlan tag.

    handle_offloads() calls skb_reset_inner_headers() to store
    the layer pointers to the encapsulated packet. However, we
    currently push the vlag tag (if there is one) onto the packet
    afterwards. This changes the MAC header for the encapsulated
    packet but it is not reflected in skb->inner_mac_header, which
    breaks GSO and drivers which attempt to use this for encapsulation
    offloads.

    Fixes: b736a623 ("vxlan: Add tx-vlan offload support.")
    Signed-off-by: Jesse Gross <jesse@nicira.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
Upstream: 4aac884d ("udptunnels: Call handle_offloads after inserting vlan tag.")
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>