4 files changed, 28 insertions, 16 deletions

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index f4fbcb5aa24a..3958adade7eb 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -606,8 +606,8 @@ struct nvsp_message {
 } __packed;
 
 
-#define NETVSC_MTU 65536
-#define NETVSC_MTU_MIN 68
+#define NETVSC_MTU 65535
+#define NETVSC_MTU_MIN ETH_MIN_MTU
 
 #define NETVSC_RECEIVE_BUFFER_SIZE		(1024*1024*16)	/* 16MB */
 #define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY	(1024*1024*15)  /* 15MB */
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 720b5fa9e625..5a1cc089acb7 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -410,8 +410,8 @@ static int netvsc_init_buf(struct hv_device *device)
 	net_device->send_section_cnt =
 		net_device->send_buf_size / net_device->send_section_size;
 
-	dev_info(&device->device, "Send section size: %d, Section count:%d\n",
-		 net_device->send_section_size, net_device->send_section_cnt);
+	netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
+		   net_device->send_section_size, net_device->send_section_cnt);
 
 	/* Setup state for managing the send buffer. */
 	net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
@@ -578,7 +578,7 @@ void netvsc_device_remove(struct hv_device *device)
 	 * At this point, no one should be accessing net_device
 	 * except in here
 	 */
-	dev_notice(&device->device, "net device safe to remove\n");
+	netdev_dbg(ndev, "net device safe to remove\n");
 
 	/* Now, we can close the channel safely */
 	vmbus_close(device->channel);
@@ -888,6 +888,13 @@ int netvsc_send(struct hv_device *device,
 	if (!net_device)
 		return -ENODEV;
 
+	/* We may race with netvsc_connect_vsp()/netvsc_init_buf() and get
+	 * here before the negotiation with the host is finished and
+	 * send_section_map may not be allocated yet.
+	 */
+	if (!net_device->send_section_map)
+		return -EAGAIN;
+
 	out_channel = net_device->chn_table[q_idx];
 
 	packet->send_buf_index = NETVSC_INVALID_INDEX;
@@ -1380,7 +1387,7 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
 	}
 
 	/* Channel is opened */
-	pr_info("hv_netvsc channel opened successfully\n");
+	netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
 
 	/* If we're reopening the device we may have multiple queues, fill the
 	 * chn_table with the default channel to use it before subchannels are
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index f6382150b16a..c9414c054852 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -47,6 +47,10 @@
 				 NETIF_F_TSO | \
 				 NETIF_F_TSO6 | \
 				 NETIF_F_HW_CSUM)
+
+/* Restrict GSO size to account for NVGRE */
+#define NETVSC_GSO_MAX_SIZE	62768
+
 static int ring_size = 128;
 module_param(ring_size, int, S_IRUGO);
 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
@@ -871,19 +875,12 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 	struct netvsc_device *nvdev = ndevctx->nvdev;
 	struct hv_device *hdev = ndevctx->device_ctx;
 	struct netvsc_device_info device_info;
-	int limit = ETH_DATA_LEN;
 	u32 num_chn;
 	int ret = 0;
 
 	if (ndevctx->start_remove || !nvdev || nvdev->destroy)
 		return -ENODEV;
 
-	if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
-		limit = NETVSC_MTU - ETH_HLEN;
-
-	if (mtu < NETVSC_MTU_MIN || mtu > limit)
-		return -EINVAL;
-
 	ret = netvsc_close(ndev);
 	if (ret)
 		goto out;
@@ -1400,6 +1397,14 @@ static int netvsc_probe(struct hv_device *dev,
 	nvdev = net_device_ctx->nvdev;
 	netif_set_real_num_tx_queues(net, nvdev->num_chn);
 	netif_set_real_num_rx_queues(net, nvdev->num_chn);
+	netif_set_gso_max_size(net, NETVSC_GSO_MAX_SIZE);
+
+	/* MTU range: 68 - 1500 or 65521 */
+	net->min_mtu = NETVSC_MTU_MIN;
+	if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
+		net->max_mtu = NETVSC_MTU - ETH_HLEN;
+	else
+		net->max_mtu = ETH_DATA_LEN;
 
 	ret = register_netdev(net);
 	if (ret != 0) {
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 9195d5da8485..8d90904e0e49 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1059,9 +1059,9 @@ int rndis_filter_device_add(struct hv_device *dev,
 
 	device_info->link_state = rndis_device->link_state;
 
-	dev_info(&dev->device, "Device MAC %pM link state %s\n",
-		 rndis_device->hw_mac_adr,
-		 device_info->link_state ? "down" : "up");
+	netdev_dbg(net, "Device MAC %pM link state %s\n",
+		   rndis_device->hw_mac_adr,
+		   device_info->link_state ? "down" : "up");
 
 	if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
 		return 0;