virtio_net: remove custom busy_poll

Generic NAPI busy polling allows us to remove custom implementations
found in drivers.

It is possible further optimization could be done by testing
napi_complete_done() return value.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index bd22cf3..0382827 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -29,7 +29,6 @@
 #include <linux/slab.h>
 #include <linux/cpu.h>
 #include <linux/average.h>
-#include <net/busy_poll.h>
 
 static int napi_weight = NAPI_POLL_WEIGHT;
 module_param(napi_weight, int, 0444);
@@ -1024,43 +1023,6 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
        return received;
 }
 
-#ifdef CONFIG_NET_RX_BUSY_POLL
-/* must be called with local_bh_disable()d */
-static int virtnet_busy_poll(struct napi_struct *napi)
-{
-       struct receive_queue *rq =
-               container_of(napi, struct receive_queue, napi);
-       struct virtnet_info *vi = rq->vq->vdev->priv;
-       int r, received = 0, budget = 4;
-
-       if (!(vi->status & VIRTIO_NET_S_LINK_UP))
-               return LL_FLUSH_FAILED;
-
-       if (!napi_schedule_prep(napi))
-               return LL_FLUSH_BUSY;
-
-       virtqueue_disable_cb(rq->vq);
-
-again:
-       received += virtnet_receive(rq, budget);
-
-       r = virtqueue_enable_cb_prepare(rq->vq);
-       clear_bit(NAPI_STATE_SCHED, &napi->state);
-       if (unlikely(virtqueue_poll(rq->vq, r)) &&
-           napi_schedule_prep(napi)) {
-               virtqueue_disable_cb(rq->vq);
-               if (received < budget) {
-                       budget -= received;
-                       goto again;
-               } else {
-                       __napi_schedule(napi);
-               }
-       }
-
-       return received;
-}
-#endif /* CONFIG_NET_RX_BUSY_POLL */
-
 static int virtnet_open(struct net_device *dev)
 {
        struct virtnet_info *vi = netdev_priv(dev);
@@ -1817,9 +1779,6 @@ static const struct net_device_ops virtnet_netdev = {
 #ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller = virtnet_netpoll,
 #endif
-#ifdef CONFIG_NET_RX_BUSY_POLL
-       .ndo_busy_poll          = virtnet_busy_poll,
-#endif
        .ndo_xdp                = virtnet_xdp,
 };