hv_netvsc: Exclude non-TCP port numbers from vRSS hashing

hv_netvsc: Exclude non-TCP port numbers from vRSS hashing

BugLink: http://bugs.launchpad.net/bugs/1690174
Azure hosts are not supporting non-TCP port numbers in vRSS hashing for
now. For example, UDP packet loss rate will be high if port numbers are
also included in vRSS hash.

So, we created this patch to use only IP numbers for hashing in non-TCP
traffic.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(backported from commit f72860afa2e32cdc674cbdd7f354f8fb62e908a6)
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Conflicts:
	drivers/net/hyperv/netvsc_drv.c
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>