From: Haiyang Zhang <haiyangz@microsoft.com>
Date: Wed, 21 Jun 2017 23:40:47 +0000 (-0700)
Subject: hv_netvsc: Fix the carrier state error when data path is off
X-Git-Tag: v4.13-rc1~157^2~110
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=53fa1a6f33520f01f9dbee48369074b34d77616b;p=karo-tx-linux.git

hv_netvsc: Fix the carrier state error when data path is off

When the VF NIC is opened, the synthetic NIC's carrier state is set to
off. This tells the host to transitions data path to the VF device. But
if startup script or user manipulates the admin state of the netvsc
device directly for example:
        # ifconfig eth0 down
	# ifconfig eth0 up
Then the carrier state of the synthetic NIC would be on, even though the
data path was still over the VF NIC. This patch sets the carrier state
of synthetic NIC with consideration of the related VF state.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index ced947d25793..d6c25580f8dd 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -717,6 +717,8 @@ struct net_device_context {
 	u32 vf_alloc;
 	/* Serial number of the VF to team with */
 	u32 vf_serial;
+
+	bool datapath;	/* 0 - synthetic, 1 - VF nic */
 };
 
 /* Per channel data */
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 7c5ed8fe7a4f..0a9167dd72fb 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -57,6 +57,8 @@ void netvsc_switch_datapath(struct net_device *ndev, bool vf)
 			       sizeof(struct nvsp_message),
 			       (unsigned long)init_pkt,
 			       VM_PKT_DATA_INBAND, 0);
+
+	net_device_ctx->datapath = vf;
 }
 
 static struct netvsc_device *alloc_net_device(void)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 9a6c5864bc04..991372150463 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -68,7 +68,8 @@ static void netvsc_set_multicast_list(struct net_device *net)
 
 static int netvsc_open(struct net_device *net)
 {
-	struct netvsc_device *nvdev = net_device_to_netvsc_device(net);
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	struct netvsc_device *nvdev = ndev_ctx->nvdev;
 	struct rndis_device *rdev;
 	int ret = 0;
 
@@ -84,7 +85,7 @@ static int netvsc_open(struct net_device *net)
 	netif_tx_wake_all_queues(net);
 
 	rdev = nvdev->extension;
-	if (!rdev->link_state)
+	if (!rdev->link_state && !ndev_ctx->datapath)
 		netif_carrier_on(net);
 
 	return ret;
@@ -1284,7 +1285,8 @@ static void netvsc_link_change(struct work_struct *w)
 	case RNDIS_STATUS_MEDIA_CONNECT:
 		if (rdev->link_state) {
 			rdev->link_state = false;
-			netif_carrier_on(net);
+			if (!ndev_ctx->datapath)
+				netif_carrier_on(net);
 			netif_tx_wake_all_queues(net);
 		} else {
 			notify = true;