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Date: Sat, 22 Oct 2011 13:43:11 +0800
From: Jason Wang <jasowang@...hat.com>
To: aliguori@...ibm.com, quintela@...hat.com, jan.kiszka@...mens.com,
mst@...hat.com, qemu-devel@...gnu.org, blauwirbel@...il.com
Cc: pbonzini@...hat.com, rusty@...tcorp.com.au, kvm@...r.kernel.org,
netdev@...r.kernel.org
Subject: [RFC v2 PATCH 5/4 PATCH] virtio-net: send gratuitous packet when
needed
This make let virtio-net driver can send gratituous packet by a new
config bit - VIRTIO_NET_S_ANNOUNCE in each config update
interrupt. When this bit is set by backend, the driver would schedule
a workqueue to send gratituous packet through NETDEV_NOTIFY_PEERS.
This feature is negotiated through bit VIRTIO_NET_F_GUEST_ANNOUNCE.
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
drivers/net/virtio_net.c | 31 ++++++++++++++++++++++++++++++-
include/linux/virtio_net.h | 2 ++
2 files changed, 32 insertions(+), 1 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index b8225f3..1cdecf7 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -71,6 +71,9 @@ struct virtnet_info {
/* Work struct for refilling if we run low on memory. */
struct delayed_work refill;
+ /* Work struct for send gratituous packet. */
+ struct work_struct announce;
+
/* Chain pages by the private ptr. */
struct page *pages;
@@ -507,6 +510,13 @@ static void refill_work(struct work_struct *work)
schedule_delayed_work(&vi->refill, HZ/2);
}
+static void announce_work(struct work_struct *work)
+{
+ struct virtnet_info *vi = container_of(work, struct virtnet_info,
+ announce);
+ netif_notify_peers(vi->dev);
+}
+
static int virtnet_poll(struct napi_struct *napi, int budget)
{
struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
@@ -923,11 +933,22 @@ static void virtnet_update_status(struct virtnet_info *vi)
&v, sizeof(v));
/* Ignore unknown (future) status bits */
- v &= VIRTIO_NET_S_LINK_UP;
+ v &= VIRTIO_NET_S_LINK_UP | VIRTIO_NET_S_ANNOUNCE;
if (vi->status == v)
return;
+ if (v & VIRTIO_NET_S_ANNOUNCE) {
+ if ((v & VIRTIO_NET_S_LINK_UP) &&
+ virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ANNOUNCE))
+ schedule_work(&vi->announce);
+ v &= ~VIRTIO_NET_S_ANNOUNCE;
+ vi->vdev->config->set(vi->vdev,
+ offsetof(struct virtio_net_config,
+ status),
+ &v, sizeof(v));
+ }
+
vi->status = v;
if (vi->status & VIRTIO_NET_S_LINK_UP) {
@@ -937,6 +958,7 @@ static void virtnet_update_status(struct virtnet_info *vi)
netif_carrier_off(vi->dev);
netif_stop_queue(vi->dev);
}
+
}
static void virtnet_config_changed(struct virtio_device *vdev)
@@ -1016,6 +1038,8 @@ static int virtnet_probe(struct virtio_device *vdev)
goto free;
INIT_DELAYED_WORK(&vi->refill, refill_work);
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE))
+ INIT_WORK(&vi->announce, announce_work);
sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
@@ -1077,6 +1101,8 @@ static int virtnet_probe(struct virtio_device *vdev)
unregister:
unregister_netdev(dev);
cancel_delayed_work_sync(&vi->refill);
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ANNOUNCE))
+ cancel_work_sync(&vi->announce);
free_vqs:
vdev->config->del_vqs(vdev);
free_stats:
@@ -1118,6 +1144,8 @@ static void __devexit virtnet_remove(struct virtio_device *vdev)
unregister_netdev(vi->dev);
cancel_delayed_work_sync(&vi->refill);
+ if(virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ANNOUNCE))
+ cancel_work_sync(&vi->announce);
/* Free unused buffers in both send and recv, if any. */
free_unused_bufs(vi);
@@ -1144,6 +1172,7 @@ static unsigned int features[] = {
VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
+ VIRTIO_NET_F_GUEST_ANNOUNCE,
};
static struct virtio_driver virtio_net_driver = {
diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
index 970d5a2..44a38d6 100644
--- a/include/linux/virtio_net.h
+++ b/include/linux/virtio_net.h
@@ -49,8 +49,10 @@
#define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
#define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
#define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */
+#define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can send gratituous packet */
#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
+#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
struct virtio_net_config {
/* The config defining mac address (if VIRTIO_NET_F_MAC) */
--
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