After Quick Migration, the network is not immediately operational in the
current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, I added
another netif_notify_peers() into a scheduled work, otherwise GARP packet will
not be sent after quick migration, and cause network disconnection.
Thanks to Mike Surcouf <mike@xxxxxxxxxxxxx> for reporting the bug and
testing the patch.
This patch should also be backported to stable kernel 2.6.32 and later.
Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Signed-off-by: Hank Janssen <hjanssen@xxxxxxxxxxxxx>
Signed-off-by: Abhishek Kane <v-abkane@xxxxxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Cc: Mike Surcouf <mike@xxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxx>
---
drivers/staging/hv/netvsc_drv.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/drivers/staging/hv/netvsc_drv.c b/drivers/staging/hv/netvsc_drv.c
index 54a203b..258233d 100644
--- a/drivers/staging/hv/netvsc_drv.c
+++ b/drivers/staging/hv/netvsc_drv.c
@@ -48,6 +48,7 @@ struct net_device_context {
/* point back to our device context */
struct hv_device *device_ctx;
unsigned long avail;
+ struct work_struct work;
};
@@ -214,6 +215,7 @@ static void netvsc_linkstatus_callback(struct hv_device *device_obj,
unsigned int status)
{
struct net_device *net = dev_get_drvdata(&device_obj->device);
+ struct net_device_context *ndev_ctx;
if (!net) {
netdev_err(net, "got link status but net device "
@@ -225,6 +227,8 @@ static void netvsc_linkstatus_callback(struct hv_device *device_obj,
netif_carrier_on(net);
netif_wake_queue(net);
netif_notify_peers(net);
+ ndev_ctx = netdev_priv(net);
+ schedule_work(&ndev_ctx->work);
} else {
netif_carrier_off(net);
netif_stop_queue(net);
@@ -320,6 +324,25 @@ static const struct net_device_ops device_ops = {
.ndo_set_mac_address = eth_mac_addr,
};
+/*
+ * Send GARP packet to network peers after migrations.
+ * After Quick Migration, the network is not immediately operational in the
+ * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
+ * another netif_notify_peers() into a scheduled work, otherwise GARP packet
+ * will not be sent after quick migration, and cause network disconnection.
+ */
+static void netvsc_send_garp(struct work_struct *w)
+{
+ struct net_device_context *ndev_ctx;
+ struct net_device *net;
+
+ msleep(20);
+ ndev_ctx = container_of(w, struct net_device_context, work);
+ net = dev_get_drvdata(&ndev_ctx->device_ctx->device);
+ netif_notify_peers(net);
+}
+
+
static int netvsc_probe(struct device *device)
{
struct hv_driver *drv =
@@ -345,6 +368,7 @@ static int netvsc_probe(struct device *device)
net_device_ctx->device_ctx = device_obj;
net_device_ctx->avail = ring_size;
dev_set_drvdata(device, net);
+ INIT_WORK(&net_device_ctx->work, netvsc_send_garp);
/* Notify the netvsc driver of the new device */
ret = net_drv_obj->base.dev_add(device_obj, &device_info);
--
1.7.4.1
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