tuntap: calculate rps hash only when needed
There's no need to calculate rps hash if it was not enabled. So this patch export rps_needed and check it before trying to get rps hash. Tests (using pktgen to inject packets to guest) shows this can improve pps about 13% (when rps is disabled). Before: ~1150000 pps After: ~1300000 pps Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: NJason Wang <jasowang@redhat.com> ---- Changes from V1: - Fix build when CONFIG_RPS is not set Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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