datapath: select vport upcall portid directly

datapath: select vport upcall portid directly

Upstream commit:
    commit 90ce9f23a886bdef7a4b7a9bd52c7a50a6a81635
    Author: Tonghao Zhang <xiangxia.m.yue@gmail.com>
    Date:   Thu Nov 7 00:34:28 2019 +0800

    net: openvswitch: select vport upcall portid directly

    The commit 69c51582ff786 ("dpif-netlink: don't allocate per
    thread netlink sockets"), in Open vSwitch ovs-vswitchd, has
    changed the number of allocated sockets to just one per port
    by moving the socket array from a per handler structure to
    a per datapath one. In the kernel datapath, a vport will have
    only one socket in most case, if so select it directly in
    fast-path.

    Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
    Acked-by: Pravin B Shelar <pshelar@ovn.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Yi-Hung Wei <yihung.wei@gmail.com>
Signed-off-by: Greg Rose <gvrose8192@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>