net: implement threaded-able napi poll loop support
This patch allows running each napi poll loop inside its own kernel thread. The kthread is created during netif_napi_add() if dev->threaded is set. And threaded mode is enabled in napi_enable(). We will provide a way to set dev->threaded and enable threaded mode without a device up/down in the following patch. Once that threaded mode is enabled and the kthread is started, napi_schedule() will wake-up such thread instead of scheduling the softirq. The threaded poll loop behaves quite likely the net_rx_action, but it does not have to manipulate local irqs and uses an explicit scheduling point based on netdev_budget. Co-developed-by: NPaolo Abeni <pabeni@redhat.com> Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Co-developed-by: NHannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: NHannes Frederic Sowa <hannes@stressinduktion.org> Co-developed-by: NJakub Kicinski <kuba@kernel.org> Signed-off-by: NJakub Kicinski <kuba@kernel.org> Signed-off-by: NWei Wang <weiwan@google.com> Reviewed-by: NAlexander Duyck <alexanderduyck@fb.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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