linux-kernel - [PATCH net-next V2 1/3] virtio-net: introduce helpers to enable and disable all NAPIs

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Date:	Wed, 16 Jul 2014 14:21:45 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	rusty@...tcorp.com.au, mst@...hat.com,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Jason Wang <jasowang@...hat.com>,
	Vlad Yasevich <vyasevic@...hat.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next V2 1/3] virtio-net: introduce helpers to enable and disable all NAPIs

This patch introduces helpers to disable and enable NAPI for all rx
queues. This will be used by rx busy polling support.

Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Vlad Yasevich <vyasevic@...hat.com>
Cc: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/net/virtio_net.c | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7d9f84a..e1e1691 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -760,6 +760,22 @@ again:
 	return received;
 }
 
+static void virtnet_napi_enable_all(struct virtnet_info *vi)
+{
+	int i;
+
+	for (i = 0; i < vi->max_queue_pairs; i++)
+		virtnet_napi_enable(&vi->rq[i]);
+}
+
+static void virtnet_napi_disable_all(struct virtnet_info *vi)
+{
+	int i;
+
+	for (i = 0; i < vi->max_queue_pairs; i++)
+		napi_disable(&vi->rq[i].napi);
+}
+
 static int virtnet_open(struct net_device *dev)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
@@ -770,9 +786,10 @@ static int virtnet_open(struct net_device *dev)
 			/* Make sure we have some buffers: if oom use wq. */
 			if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
 				schedule_delayed_work(&vi->refill, 0);
-		virtnet_napi_enable(&vi->rq[i]);
 	}
 
+	virtnet_napi_enable_all(vi);
+
 	return 0;
 }
 
@@ -1076,13 +1093,11 @@ static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
 static int virtnet_close(struct net_device *dev)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
-	int i;
 
 	/* Make sure refill_work doesn't re-enable napi! */
 	cancel_delayed_work_sync(&vi->refill);
 
-	for (i = 0; i < vi->max_queue_pairs; i++)
-		napi_disable(&vi->rq[i].napi);
+	virtnet_napi_disable_all(vi);
 
 	return 0;
 }
@@ -1853,11 +1868,11 @@ static int virtnet_freeze(struct virtio_device *vdev)
 	netif_device_detach(vi->dev);
 	cancel_delayed_work_sync(&vi->refill);
 
-	if (netif_running(vi->dev))
-		for (i = 0; i < vi->max_queue_pairs; i++) {
-			napi_disable(&vi->rq[i].napi);
+	if (netif_running(vi->dev)) {
+		virtnet_napi_disable_all(vi);
+		for (i = 0; i < vi->max_queue_pairs; i++)
 			netif_napi_del(&vi->rq[i].napi);
-		}
+	}
 
 	remove_vq_common(vi);
 
@@ -1880,8 +1895,7 @@ static int virtnet_restore(struct virtio_device *vdev)
 			if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
 				schedule_delayed_work(&vi->refill, 0);
 
-		for (i = 0; i < vi->max_queue_pairs; i++)
-			virtnet_napi_enable(&vi->rq[i]);
+		virtnet_napi_enable_all(vi);
 	}
 
 	netif_device_attach(vi->dev);
-- 
1.8.3.1

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