staging: hv: move hv_netvsc out of staging area

hv_netvsc has been reviewed on netdev mailing list on 6/09/2011.
All recommended changes have been made. We are requesting to move
it out of staging area.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: KY Srinivasan <kys@microsoft.com>
Signed-off-by: Mike Sterling <Mike.Sterling@microsoft.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

8 files changed, 3320 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 654a5e9..99aa7fa 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -338,4 +338,6 @@ config VMXNET3
 	  To compile this driver as a module, choose M here: the
 	  module will be called vmxnet3.
 
+source "drivers/net/hyperv/Kconfig"
+
 endif # NETDEVICES
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index fa877cd..a81192b 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -66,3 +66,5 @@ obj-$(CONFIG_USB_USBNET)        += usb/
 obj-$(CONFIG_USB_ZD1201)        += usb/
 obj-$(CONFIG_USB_IPHETH)        += usb/
 obj-$(CONFIG_USB_CDC_PHONET)   += usb/
+
+obj-$(CONFIG_HYPERV_NET) += hyperv/
diff --git a/drivers/net/hyperv/Kconfig b/drivers/net/hyperv/Kconfig
new file mode 100644
index 0000000..936968d
--- /dev/null
+++ b/drivers/net/hyperv/Kconfig
@@ -0,0 +1,5 @@
+config HYPERV_NET
+	tristate "Microsoft Hyper-V virtual network driver"
+	depends on HYPERV
+	help
+	  Select this option to enable the Hyper-V virtual network driver.
diff --git a/drivers/net/hyperv/Makefile b/drivers/net/hyperv/Makefile
new file mode 100644
index 0000000..c8a6682
--- /dev/null
+++ b/drivers/net/hyperv/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_HYPERV_NET) += hv_netvsc.o
+
+hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
new file mode 100644
index 0000000..ac1ec84
--- /dev/null
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -0,0 +1,1058 @@
+/*
+ *
+ * Copyright (c) 2011, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ *   K. Y. Srinivasan <kys@microsoft.com>
+ *
+ */
+
+#ifndef _HYPERV_NET_H
+#define _HYPERV_NET_H
+
+#include <linux/list.h>
+#include <linux/hyperv.h>
+
+/* Fwd declaration */
+struct hv_netvsc_packet;
+
+/* Represent the xfer page packet which contains 1 or more netvsc packet */
+struct xferpage_packet {
+	struct list_head list_ent;
+
+	/* # of netvsc packets this xfer packet contains */
+	u32 count;
+};
+
+/* The number of pages which are enough to cover jumbo frame buffer. */
+#define NETVSC_PACKET_MAXPAGE		4
+
+/*
+ * Represent netvsc packet which contains 1 RNDIS and 1 ethernet frame
+ * within the RNDIS
+ */
+struct hv_netvsc_packet {
+	/* Bookkeeping stuff */
+	struct list_head list_ent;
+
+	struct hv_device *device;
+	bool is_data_pkt;
+
+	/*
+	 * Valid only for receives when we break a xfer page packet
+	 * into multiple netvsc packets
+	 */
+	struct xferpage_packet *xfer_page_pkt;
+
+	union {
+		struct {
+			u64 recv_completion_tid;
+			void *recv_completion_ctx;
+			void (*recv_completion)(void *context);
+		} recv;
+		struct {
+			u64 send_completion_tid;
+			void *send_completion_ctx;
+			void (*send_completion)(void *context);
+		} send;
+	} completion;
+
+	/* This points to the memory after page_buf */
+	void *extension;
+
+	u32 total_data_buflen;
+	/* Points to the send/receive buffer where the ethernet frame is */
+	u32 page_buf_cnt;
+	struct hv_page_buffer page_buf[NETVSC_PACKET_MAXPAGE];
+};
+
+struct netvsc_device_info {
+	unsigned char mac_adr[6];
+	bool link_state;	/* 0 - link up, 1 - link down */
+	int  ring_size;
+};
+
+/* Interface */
+int netvsc_device_add(struct hv_device *device, void *additional_info);
+int netvsc_device_remove(struct hv_device *device);
+int netvsc_send(struct hv_device *device,
+		struct hv_netvsc_packet *packet);
+void netvsc_linkstatus_callback(struct hv_device *device_obj,
+				unsigned int status);
+int netvsc_recv_callback(struct hv_device *device_obj,
+			struct hv_netvsc_packet *packet);
+int rndis_filter_open(struct hv_device *dev);
+int rndis_filter_close(struct hv_device *dev);
+int rndis_filter_device_add(struct hv_device *dev,
+			void *additional_info);
+void rndis_filter_device_remove(struct hv_device *dev);
+int rndis_filter_receive(struct hv_device *dev,
+			struct hv_netvsc_packet *pkt);
+
+
+
+int rndis_filter_send(struct hv_device *dev,
+			struct hv_netvsc_packet *pkt);
+
+#define NVSP_INVALID_PROTOCOL_VERSION	((u32)0xFFFFFFFF)
+
+#define NVSP_PROTOCOL_VERSION_1		2
+#define NVSP_MIN_PROTOCOL_VERSION	NVSP_PROTOCOL_VERSION_1
+#define NVSP_MAX_PROTOCOL_VERSION	NVSP_PROTOCOL_VERSION_1
+
+enum {
+	NVSP_MSG_TYPE_NONE = 0,
+
+	/* Init Messages */
+	NVSP_MSG_TYPE_INIT			= 1,
+	NVSP_MSG_TYPE_INIT_COMPLETE		= 2,
+
+	NVSP_VERSION_MSG_START			= 100,
+
+	/* Version 1 Messages */
+	NVSP_MSG1_TYPE_SEND_NDIS_VER		= NVSP_VERSION_MSG_START,
+
+	NVSP_MSG1_TYPE_SEND_RECV_BUF,
+	NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE,
+	NVSP_MSG1_TYPE_REVOKE_RECV_BUF,
+
+	NVSP_MSG1_TYPE_SEND_SEND_BUF,
+	NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE,
+	NVSP_MSG1_TYPE_REVOKE_SEND_BUF,
+
+	NVSP_MSG1_TYPE_SEND_RNDIS_PKT,
+	NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
+
+	/*
+	 * This should be set to the number of messages for the version with
+	 * the maximum number of messages.
+	 */
+	NVSP_NUM_MSG_PER_VERSION		= 9,
+};
+
+enum {
+	NVSP_STAT_NONE = 0,
+	NVSP_STAT_SUCCESS,
+	NVSP_STAT_FAIL,
+	NVSP_STAT_PROTOCOL_TOO_NEW,
+	NVSP_STAT_PROTOCOL_TOO_OLD,
+	NVSP_STAT_INVALID_RNDIS_PKT,
+	NVSP_STAT_BUSY,
+	NVSP_STAT_MAX,
+};
+
+struct nvsp_message_header {
+	u32 msg_type;
+};
+
+/* Init Messages */
+
+/*
+ * This message is used by the VSC to initialize the channel after the channels
+ * has been opened. This message should never include anything other then
+ * versioning (i.e. this message will be the same for ever).
+ */
+struct nvsp_message_init {
+	u32 min_protocol_ver;
+	u32 max_protocol_ver;
+} __packed;
+
+/*
+ * This message is used by the VSP to complete the initialization of the
+ * channel. This message should never include anything other then versioning
+ * (i.e. this message will be the same for ever).
+ */
+struct nvsp_message_init_complete {
+	u32 negotiated_protocol_ver;
+	u32 max_mdl_chain_len;
+	u32 status;
+} __packed;
+
+union nvsp_message_init_uber {
+	struct nvsp_message_init init;
+	struct nvsp_message_init_complete init_complete;
+} __packed;
+
+/* Version 1 Messages */
+
+/*
+ * This message is used by the VSC to send the NDIS version to the VSP. The VSP
+ * can use this information when handling OIDs sent by the VSC.
+ */
+struct nvsp_1_message_send_ndis_version {
+	u32 ndis_major_ver;
+	u32 ndis_minor_ver;
+} __packed;
+
+/*
+ * This message is used by the VSC to send a receive buffer to the VSP. The VSP
+ * can then use the receive buffer to send data to the VSC.
+ */
+struct nvsp_1_message_send_receive_buffer {
+	u32 gpadl_handle;
+	u16 id;
+} __packed;
+
+struct nvsp_1_receive_buffer_section {
+	u32 offset;
+	u32 sub_alloc_size;
+	u32 num_sub_allocs;
+	u32 end_offset;
+} __packed;
+
+/*
+ * This message is used by the VSP to acknowledge a receive buffer send by the
+ * VSC. This message must be sent by the VSP before the VSP uses the receive
+ * buffer.
+ */
+struct nvsp_1_message_send_receive_buffer_complete {
+	u32 status;
+	u32 num_sections;
+
+	/*
+	 * The receive buffer is split into two parts, a large suballocation
+	 * section and a small suballocation section. These sections are then
+	 * suballocated by a certain size.
+	 */
+
+	/*
+	 * For example, the following break up of the receive buffer has 6
+	 * large suballocations and 10 small suballocations.
+	 */
+
+	/*
+	 * |            Large Section          |  |   Small Section   |
+	 * ------------------------------------------------------------
+	 * |     |     |     |     |     |     |  | | | | | | | | | | |
+	 * |                                      |
+	 *  LargeOffset                            SmallOffset
+	 */
+
+	struct nvsp_1_receive_buffer_section sections[1];
+} __packed;
+
+/*
+ * This message is sent by the VSC to revoke the receive buffer.  After the VSP
+ * completes this transaction, the vsp should never use the receive buffer
+ * again.
+ */
+struct nvsp_1_message_revoke_receive_buffer {
+	u16 id;
+};
+
+/*
+ * This message is used by the VSC to send a send buffer to the VSP. The VSC
+ * can then use the send buffer to send data to the VSP.
+ */
+struct nvsp_1_message_send_send_buffer {
+	u32 gpadl_handle;
+	u16 id;
+} __packed;
+
+/*
+ * This message is used by the VSP to acknowledge a send buffer sent by the
+ * VSC. This message must be sent by the VSP before the VSP uses the sent
+ * buffer.
+ */
+struct nvsp_1_message_send_send_buffer_complete {
+	u32 status;
+
+	/*
+	 * The VSC gets to choose the size of the send buffer and the VSP gets
+	 * to choose the sections size of the buffer.  This was done to enable
+	 * dynamic reconfigurations when the cost of GPA-direct buffers
+	 * decreases.
+	 */
+	u32 section_size;
+} __packed;
+
+/*
+ * This message is sent by the VSC to revoke the send buffer.  After the VSP
+ * completes this transaction, the vsp should never use the send buffer again.
+ */
+struct nvsp_1_message_revoke_send_buffer {
+	u16 id;
+};
+
+/*
+ * This message is used by both the VSP and the VSC to send a RNDIS message to
+ * the opposite channel endpoint.
+ */
+struct nvsp_1_message_send_rndis_packet {
+	/*
+	 * This field is specified by RNIDS. They assume there's two different
+	 * channels of communication. However, the Network VSP only has one.
+	 * Therefore, the channel travels with the RNDIS packet.
+	 */
+	u32 channel_type;
+
+	/*
+	 * This field is used to send part or all of the data through a send
+	 * buffer. This values specifies an index into the send buffer. If the
+	 * index is 0xFFFFFFFF, then the send buffer is not being used and all
+	 * of the data was sent through other VMBus mechanisms.
+	 */
+	u32 send_buf_section_index;
+	u32 send_buf_section_size;
+} __packed;
+
+/*
+ * This message is used by both the VSP and the VSC to complete a RNDIS message
+ * to the opposite channel endpoint. At this point, the initiator of this
+ * message cannot use any resources associated with the original RNDIS packet.
+ */
+struct nvsp_1_message_send_rndis_packet_complete {
+	u32 status;
+};
+
+union nvsp_1_message_uber {
+	struct nvsp_1_message_send_ndis_version send_ndis_ver;
+
+	struct nvsp_1_message_send_receive_buffer send_recv_buf;
+	struct nvsp_1_message_send_receive_buffer_complete
+						send_recv_buf_complete;
+	struct nvsp_1_message_revoke_receive_buffer revoke_recv_buf;
+
+	struct nvsp_1_message_send_send_buffer send_send_buf;
+	struct nvsp_1_message_send_send_buffer_complete send_send_buf_complete;
+	struct nvsp_1_message_revoke_send_buffer revoke_send_buf;
+
+	struct nvsp_1_message_send_rndis_packet send_rndis_pkt;
+	struct nvsp_1_message_send_rndis_packet_complete
+						send_rndis_pkt_complete;
+} __packed;
+
+union nvsp_all_messages {
+	union nvsp_message_init_uber init_msg;
+	union nvsp_1_message_uber v1_msg;
+} __packed;
+
+/* ALL Messages */
+struct nvsp_message {
+	struct nvsp_message_header hdr;
+	union nvsp_all_messages msg;
+} __packed;
+
+
+
+
+/* #define NVSC_MIN_PROTOCOL_VERSION		1 */
+/* #define NVSC_MAX_PROTOCOL_VERSION		1 */
+
+#define NETVSC_RECEIVE_BUFFER_SIZE		(1024*1024)	/* 1MB */
+
+#define NETVSC_RECEIVE_BUFFER_ID		0xcafe
+
+#define NETVSC_RECEIVE_SG_COUNT			1
+
+/* Preallocated receive packets */
+#define NETVSC_RECEIVE_PACKETLIST_COUNT		256
+
+#define NETVSC_PACKET_SIZE                      2048
+
+/* Per netvsc channel-specific */
+struct netvsc_device {
+	struct hv_device *dev;
+
+	atomic_t num_outstanding_sends;
+	bool destroy;
+	/*
+	 * List of free preallocated hv_netvsc_packet to represent receive
+	 * packet
+	 */
+	struct list_head recv_pkt_list;
+	spinlock_t recv_pkt_list_lock;
+
+	/* Receive buffer allocated by us but manages by NetVSP */
+	void *recv_buf;
+	u32 recv_buf_size;
+	u32 recv_buf_gpadl_handle;
+	u32 recv_section_cnt;
+	struct nvsp_1_receive_buffer_section *recv_section;
+
+	/* Used for NetVSP initialization protocol */
+	struct completion channel_init_wait;
+	struct nvsp_message channel_init_pkt;
+
+	struct nvsp_message revoke_packet;
+	/* unsigned char HwMacAddr[HW_MACADDR_LEN]; */
+
+	struct net_device *ndev;
+
+	/* Holds rndis device info */
+	void *extension;
+};
+
+
+/*  Status codes */
+
+
+#ifndef STATUS_SUCCESS
+#define STATUS_SUCCESS				(0x00000000L)
+#endif
+
+#ifndef STATUS_UNSUCCESSFUL
+#define STATUS_UNSUCCESSFUL			(0xC0000001L)
+#endif
+
+#ifndef STATUS_PENDING
+#define STATUS_PENDING				(0x00000103L)
+#endif
+
+#ifndef STATUS_INSUFFICIENT_RESOURCES
+#define STATUS_INSUFFICIENT_RESOURCES		(0xC000009AL)
+#endif
+
+#ifndef STATUS_BUFFER_OVERFLOW
+#define STATUS_BUFFER_OVERFLOW			(0x80000005L)
+#endif
+
+#ifndef STATUS_NOT_SUPPORTED
+#define STATUS_NOT_SUPPORTED			(0xC00000BBL)
+#endif
+
+#define RNDIS_STATUS_SUCCESS			(STATUS_SUCCESS)
+#define RNDIS_STATUS_PENDING			(STATUS_PENDING)
+#define RNDIS_STATUS_NOT_RECOGNIZED		(0x00010001L)
+#define RNDIS_STATUS_NOT_COPIED			(0x00010002L)
+#define RNDIS_STATUS_NOT_ACCEPTED		(0x00010003L)
+#define RNDIS_STATUS_CALL_ACTIVE		(0x00010007L)
+
+#define RNDIS_STATUS_ONLINE			(0x40010003L)
+#define RNDIS_STATUS_RESET_START		(0x40010004L)
+#define RNDIS_STATUS_RESET_END			(0x40010005L)
+#define RNDIS_STATUS_RING_STATUS		(0x40010006L)
+#define RNDIS_STATUS_CLOSED			(0x40010007L)
+#define RNDIS_STATUS_WAN_LINE_UP		(0x40010008L)
+#define RNDIS_STATUS_WAN_LINE_DOWN		(0x40010009L)
+#define RNDIS_STATUS_WAN_FRAGMENT		(0x4001000AL)
+#define RNDIS_STATUS_MEDIA_CONNECT		(0x4001000BL)
+#define RNDIS_STATUS_MEDIA_DISCONNECT		(0x4001000CL)
+#define RNDIS_STATUS_HARDWARE_LINE_UP		(0x4001000DL)
+#define RNDIS_STATUS_HARDWARE_LINE_DOWN		(0x4001000EL)
+#define RNDIS_STATUS_INTERFACE_UP		(0x4001000FL)
+#define RNDIS_STATUS_INTERFACE_DOWN		(0x40010010L)
+#define RNDIS_STATUS_MEDIA_BUSY			(0x40010011L)
+#define RNDIS_STATUS_MEDIA_SPECIFIC_INDICATION	(0x40010012L)
+#define RNDIS_STATUS_WW_INDICATION		RDIA_SPECIFIC_INDICATION
+#define RNDIS_STATUS_LINK_SPEED_CHANGE		(0x40010013L)
+
+#define RNDIS_STATUS_NOT_RESETTABLE		(0x80010001L)
+#define RNDIS_STATUS_SOFT_ERRORS		(0x80010003L)
+#define RNDIS_STATUS_HARD_ERRORS		(0x80010004L)
+#define RNDIS_STATUS_BUFFER_OVERFLOW		(STATUS_BUFFER_OVERFLOW)
+
+#define RNDIS_STATUS_FAILURE			(STATUS_UNSUCCESSFUL)
+#define RNDIS_STATUS_RESOURCES			(STATUS_INSUFFICIENT_RESOURCES)
+#define RNDIS_STATUS_CLOSING			(0xC0010002L)
+#define RNDIS_STATUS_BAD_VERSION		(0xC0010004L)
+#define RNDIS_STATUS_BAD_CHARACTERISTICS	(0xC0010005L)
+#define RNDIS_STATUS_ADAPTER_NOT_FOUND		(0xC0010006L)
+#define RNDIS_STATUS_OPEN_FAILED		(0xC0010007L)
+#define RNDIS_STATUS_DEVICE_FAILED		(0xC0010008L)
+#define RNDIS_STATUS_MULTICAST_FULL		(0xC0010009L)
+#define RNDIS_STATUS_MULTICAST_EXISTS		(0xC001000AL)
+#define RNDIS_STATUS_MULTICAST_NOT_FOUND	(0xC001000BL)
+#define RNDIS_STATUS_REQUEST_ABORTED		(0xC001000CL)
+#define RNDIS_STATUS_RESET_IN_PROGRESS		(0xC001000DL)
+#define RNDIS_STATUS_CLOSING_INDICATING		(0xC001000EL)
+#define RNDIS_STATUS_NOT_SUPPORTED		(STATUS_NOT_SUPPORTED)
+#define RNDIS_STATUS_INVALID_PACKET		(0xC001000FL)
+#define RNDIS_STATUS_OPEN_LIST_FULL		(0xC0010010L)
+#define RNDIS_STATUS_ADAPTER_NOT_READY		(0xC0010011L)
+#define RNDIS_STATUS_ADAPTER_NOT_OPEN		(0xC0010012L)
+#define RNDIS_STATUS_NOT_INDICATING		(0xC0010013L)
+#define RNDIS_STATUS_INVALID_LENGTH		(0xC0010014L)
+#define RNDIS_STATUS_INVALID_DATA		(0xC0010015L)
+#define RNDIS_STATUS_BUFFER_TOO_SHORT		(0xC0010016L)
+#define RNDIS_STATUS_INVALID_OID		(0xC0010017L)
+#define RNDIS_STATUS_ADAPTER_REMOVED		(0xC0010018L)
+#define RNDIS_STATUS_UNSUPPORTED_MEDIA		(0xC0010019L)
+#define RNDIS_STATUS_GROUP_ADDRESS_IN_USE	(0xC001001AL)
+#define RNDIS_STATUS_FILE_NOT_FOUND		(0xC001001BL)
+#define RNDIS_STATUS_ERROR_READING_FILE		(0xC001001CL)
+#define RNDIS_STATUS_ALREADY_MAPPED		(0xC001001DL)
+#define RNDIS_STATUS_RESOURCE_CONFLICT		(0xC001001EL)
+#define RNDIS_STATUS_NO_CABLE			(0xC001001FL)
+
+#define RNDIS_STATUS_INVALID_SAP		(0xC0010020L)
+#define RNDIS_STATUS_SAP_IN_USE			(0xC0010021L)
+#define RNDIS_STATUS_INVALID_ADDRESS		(0xC0010022L)
+#define RNDIS_STATUS_VC_NOT_ACTIVATED		(0xC0010023L)
+#define RNDIS_STATUS_DEST_OUT_OF_ORDER		(0xC0010024L)
+#define RNDIS_STATUS_VC_NOT_AVAILABLE		(0xC0010025L)
+#define RNDIS_STATUS_CELLRATE_NOT_AVAILABLE	(0xC0010026L)
+#define RNDIS_STATUS_INCOMPATABLE_QOS		(0xC0010027L)
+#define RNDIS_STATUS_AAL_PARAMS_UNSUPPORTED	(0xC0010028L)
+#define RNDIS_STATUS_NO_ROUTE_TO_DESTINATION	(0xC0010029L)
+
+#define RNDIS_STATUS_TOKEN_RING_OPEN_ERROR	(0xC0011000L)
+
+/* Object Identifiers used by NdisRequest Query/Set Information */
+/* General Objects */
+#define RNDIS_OID_GEN_SUPPORTED_LIST		0x00010101
+#define RNDIS_OID_GEN_HARDWARE_STATUS		0x00010102
+#define RNDIS_OID_GEN_MEDIA_SUPPORTED		0x00010103
+#define RNDIS_OID_GEN_MEDIA_IN_USE		0x00010104
+#define RNDIS_OID_GEN_MAXIMUM_LOOKAHEAD		0x00010105
+#define RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE	0x00010106
+#define RNDIS_OID_GEN_LINK_SPEED		0x00010107
+#define RNDIS_OID_GEN_TRANSMIT_BUFFER_SPACE	0x00010108
+#define RNDIS_OID_GEN_RECEIVE_BUFFER_SPACE	0x00010109
+#define RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE	0x0001010A
+#define RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE	0x0001010B
+#define RNDIS_OID_GEN_VENDOR_ID			0x0001010C
+#define RNDIS_OID_GEN_VENDOR_DESCRIPTION	0x0001010D
+#define RNDIS_OID_GEN_CURRENT_PACKET_FILTER	0x0001010E
+#define RNDIS_OID_GEN_CURRENT_LOOKAHEAD		0x0001010F
+#define RNDIS_OID_GEN_DRIVER_VERSION		0x00010110
+#define RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE	0x00010111
+#define RNDIS_OID_GEN_PROTOCOL_OPTIONS		0x00010112
+#define RNDIS_OID_GEN_MAC_OPTIONS		0x00010113
+#define RNDIS_OID_GEN_MEDIA_CONNECT_STATUS	0x00010114
+#define RNDIS_OID_GEN_MAXIMUM_SEND_PACKETS	0x00010115
+#define RNDIS_OID_GEN_VENDOR_DRIVER_VERSION	0x00010116
+#define RNDIS_OID_GEN_NETWORK_LAYER_ADDRESSES	0x00010118
+#define RNDIS_OID_GEN_TRANSPORT_HEADER_OFFSET	0x00010119
+#define RNDIS_OID_GEN_MACHINE_NAME		0x0001021A
+#define RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER	0x0001021B
+
+#define RNDIS_OID_GEN_XMIT_OK			0x00020101
+#define RNDIS_OID_GEN_RCV_OK			0x00020102
+#define RNDIS_OID_GEN_XMIT_ERROR		0x00020103
+#define RNDIS_OID_GEN_RCV_ERROR			0x00020104
+#define RNDIS_OID_GEN_RCV_NO_BUFFER		0x00020105
+
+#define RNDIS_OID_GEN_DIRECTED_BYTES_XMIT	0x00020201
+#define RNDIS_OID_GEN_DIRECTED_FRAMES_XMIT	0x00020202
+#define RNDIS_OID_GEN_MULTICAST_BYTES_XMIT	0x00020203
+#define RNDIS_OID_GEN_MULTICAST_FRAMES_XMIT	0x00020204
+#define RNDIS_OID_GEN_BROADCAST_BYTES_XMIT	0x00020205
+#define RNDIS_OID_GEN_BROADCAST_FRAMES_XMIT	0x00020206
+#define RNDIS_OID_GEN_DIRECTED_BYTES_RCV	0x00020207
+#define RNDIS_OID_GEN_DIRECTED_FRAMES_RCV	0x00020208
+#define RNDIS_OID_GEN_MULTICAST_BYTES_RCV	0x00020209
+#define RNDIS_OID_GEN_MULTICAST_FRAMES_RCV	0x0002020A
+#define RNDIS_OID_GEN_BROADCAST_BYTES_RCV	0x0002020B
+#define RNDIS_OID_GEN_BROADCAST_FRAMES_RCV	0x0002020C
+
+#define RNDIS_OID_GEN_RCV_CRC_ERROR		0x0002020D
+#define RNDIS_OID_GEN_TRANSMIT_QUEUE_LENGTH	0x0002020E
+
+#define RNDIS_OID_GEN_GET_TIME_CAPS		0x0002020F
+#define RNDIS_OID_GEN_GET_NETCARD_TIME		0x00020210
+
+/* These are connection-oriented general OIDs. */
+/* These replace the above OIDs for connection-oriented media. */
+#define RNDIS_OID_GEN_CO_SUPPORTED_LIST		0x00010101
+#define RNDIS_OID_GEN_CO_HARDWARE_STATUS	0x00010102
+#define RNDIS_OID_GEN_CO_MEDIA_SUPPORTED	0x00010103
+#define RNDIS_OID_GEN_CO_MEDIA_IN_USE		0x00010104
+#define RNDIS_OID_GEN_CO_LINK_SPEED		0x00010105
+#define RNDIS_OID_GEN_CO_VENDOR_ID		0x00010106
+#define RNDIS_OID_GEN_CO_VENDOR_DESCRIPTION	0x00010107
+#define RNDIS_OID_GEN_CO_DRIVER_VERSION		0x00010108
+#define RNDIS_OID_GEN_CO_PROTOCOL_OPTIONS	0x00010109
+#define RNDIS_OID_GEN_CO_MAC_OPTIONS		0x0001010A
+#define RNDIS_OID_GEN_CO_MEDIA_CONNECT_STATUS	0x0001010B
+#define RNDIS_OID_GEN_CO_VENDOR_DRIVER_VERSION	0x0001010C
+#define RNDIS_OID_GEN_CO_MINIMUM_LINK_SPEED	0x0001010D
+
+#define RNDIS_OID_GEN_CO_GET_TIME_CAPS		0x00010201
+#define RNDIS_OID_GEN_CO_GET_NETCARD_TIME	0x00010202
+
+/* These are connection-oriented statistics OIDs. */
+#define RNDIS_OID_GEN_CO_XMIT_PDUS_OK		0x00020101
+#define RNDIS_OID_GEN_CO_RCV_PDUS_OK		0x00020102
+#define RNDIS_OID_GEN_CO_XMIT_PDUS_ERROR	0x00020103
+#define RNDIS_OID_GEN_CO_RCV_PDUS_ERROR		0x00020104
+#define RNDIS_OID_GEN_CO_RCV_PDUS_NO_BUFFER	0x00020105
+
+
+#define RNDIS_OID_GEN_CO_RCV_CRC_ERROR		0x00020201
+#define RNDIS_OID_GEN_CO_TRANSMIT_QUEUE_LENGTH	0x00020202
+#define RNDIS_OID_GEN_CO_BYTES_XMIT		0x00020203
+#define RNDIS_OID_GEN_CO_BYTES_RCV		0x00020204
+#define RNDIS_OID_GEN_CO_BYTES_XMIT_OUTSTANDING	0x00020205
+#define RNDIS_OID_GEN_CO_NETCARD_LOAD		0x00020206
+
+/* These are objects for Connection-oriented media call-managers. */
+#define RNDIS_OID_CO_ADD_PVC			0xFF000001
+#define RNDIS_OID_CO_DELETE_PVC			0xFF000002
+#define RNDIS_OID_CO_GET_CALL_INFORMATION	0xFF000003
+#define RNDIS_OID_CO_ADD_ADDRESS		0xFF000004
+#define RNDIS_OID_CO_DELETE_ADDRESS		0xFF000005
+#define RNDIS_OID_CO_GET_ADDRESSES		0xFF000006
+#define RNDIS_OID_CO_ADDRESS_CHANGE		0xFF000007
+#define RNDIS_OID_CO_SIGNALING_ENABLED		0xFF000008
+#define RNDIS_OID_CO_SIGNALING_DISABLED		0xFF000009
+
+/* 802.3 Objects (Ethernet) */
+#define RNDIS_OID_802_3_PERMANENT_ADDRESS	0x01010101
+#define RNDIS_OID_802_3_CURRENT_ADDRESS		0x01010102
+#define RNDIS_OID_802_3_MULTICAST_LIST		0x01010103
+#define RNDIS_OID_802_3_MAXIMUM_LIST_SIZE	0x01010104
+#define RNDIS_OID_802_3_MAC_OPTIONS		0x01010105
+
+#define NDIS_802_3_MAC_OPTION_PRIORITY		0x00000001
+
+#define RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT	0x01020101
+#define RNDIS_OID_802_3_XMIT_ONE_COLLISION	0x01020102
+#define RNDIS_OID_802_3_XMIT_MORE_COLLISIONS	0x01020103
+
+#define RNDIS_OID_802_3_XMIT_DEFERRED		0x01020201
+#define RNDIS_OID_802_3_XMIT_MAX_COLLISIONS	0x01020202
+#define RNDIS_OID_802_3_RCV_OVERRUN		0x01020203
+#define RNDIS_OID_802_3_XMIT_UNDERRUN		0x01020204
+#define RNDIS_OID_802_3_XMIT_HEARTBEAT_FAILURE	0x01020205
+#define RNDIS_OID_802_3_XMIT_TIMES_CRS_LOST	0x01020206
+#define RNDIS_OID_802_3_XMIT_LATE_COLLISIONS	0x01020207
+
+/* Remote NDIS message types */
+#define REMOTE_NDIS_PACKET_MSG			0x00000001
+#define REMOTE_NDIS_INITIALIZE_MSG		0x00000002
+#define REMOTE_NDIS_HALT_MSG			0x00000003
+#define REMOTE_NDIS_QUERY_MSG			0x00000004
+#define REMOTE_NDIS_SET_MSG			0x00000005
+#define REMOTE_NDIS_RESET_MSG			0x00000006
+#define REMOTE_NDIS_INDICATE_STATUS_MSG		0x00000007
+#define REMOTE_NDIS_KEEPALIVE_MSG		0x00000008
+
+#define REMOTE_CONDIS_MP_CREATE_VC_MSG		0x00008001
+#define REMOTE_CONDIS_MP_DELETE_VC_MSG		0x00008002
+#define REMOTE_CONDIS_MP_ACTIVATE_VC_MSG	0x00008005
+#define REMOTE_CONDIS_MP_DEACTIVATE_VC_MSG	0x00008006
+#define REMOTE_CONDIS_INDICATE_STATUS_MSG	0x00008007
+
+/* Remote NDIS message completion types */
+#define REMOTE_NDIS_INITIALIZE_CMPLT		0x80000002
+#define REMOTE_NDIS_QUERY_CMPLT			0x80000004
+#define REMOTE_NDIS_SET_CMPLT			0x80000005
+#define REMOTE_NDIS_RESET_CMPLT			0x80000006
+#define REMOTE_NDIS_KEEPALIVE_CMPLT		0x80000008
+
+#define REMOTE_CONDIS_MP_CREATE_VC_CMPLT	0x80008001
+#define REMOTE_CONDIS_MP_DELETE_VC_CMPLT	0x80008002
+#define REMOTE_CONDIS_MP_ACTIVATE_VC_CMPLT	0x80008005
+#define REMOTE_CONDIS_MP_DEACTIVATE_VC_CMPLT	0x80008006
+
+/*
+ * Reserved message type for private communication between lower-layer host
+ * driver and remote device, if necessary.
+ */
+#define REMOTE_NDIS_BUS_MSG			0xff000001
+
+/*  Defines for DeviceFlags in struct rndis_initialize_complete */
+#define RNDIS_DF_CONNECTIONLESS			0x00000001
+#define RNDIS_DF_CONNECTION_ORIENTED		0x00000002
+#define RNDIS_DF_RAW_DATA			0x00000004
+
+/*  Remote NDIS medium types. */
+#define RNDIS_MEDIUM_802_3			0x00000000
+#define RNDIS_MEDIUM_802_5			0x00000001
+#define RNDIS_MEDIUM_FDDI				0x00000002
+#define RNDIS_MEDIUM_WAN				0x00000003
+#define RNDIS_MEDIUM_LOCAL_TALK			0x00000004
+#define RNDIS_MEDIUM_ARCNET_RAW			0x00000006
+#define RNDIS_MEDIUM_ARCNET_878_2			0x00000007
+#define RNDIS_MEDIUM_ATM				0x00000008
+#define RNDIS_MEDIUM_WIRELESS_WAN			0x00000009
+#define RNDIS_MEDIUM_IRDA				0x0000000a
+#define RNDIS_MEDIUM_CO_WAN			0x0000000b
+/* Not a real medium, defined as an upper-bound */
+#define RNDIS_MEDIUM_MAX				0x0000000d
+
+
+/* Remote NDIS medium connection states. */
+#define RNDIS_MEDIA_STATE_CONNECTED		0x00000000
+#define RNDIS_MEDIA_STATE_DISCONNECTED		0x00000001
+
+/*  Remote NDIS version numbers */
+#define RNDIS_MAJOR_VERSION			0x00000001
+#define RNDIS_MINOR_VERSION			0x00000000
+
+
+/* NdisInitialize message */
+struct rndis_initialize_request {
+	u32 req_id;
+	u32 major_ver;
+	u32 minor_ver;
+	u32 max_xfer_size;
+};
+
+/* Response to NdisInitialize */
+struct rndis_initialize_complete {
+	u32 req_id;
+	u32 status;
+	u32 major_ver;
+	u32 minor_ver;
+	u32 dev_flags;
+	u32 medium;
+	u32 max_pkt_per_msg;
+	u32 max_xfer_size;
+	u32 pkt_alignment_factor;
+	u32 af_list_offset;
+	u32 af_list_size;
+};
+
+/* Call manager devices only: Information about an address family */
+/* supported by the device is appended to the response to NdisInitialize. */
+struct rndis_co_address_family {
+	u32 address_family;
+	u32 major_ver;
+	u32 minor_ver;
+};
+
+/* NdisHalt message */
+struct rndis_halt_request {
+	u32 req_id;
+};
+
+/* NdisQueryRequest message */
+struct rndis_query_request {
+	u32 req_id;
+	u32 oid;
+	u32 info_buflen;
+	u32 info_buf_offset;
+	u32 dev_vc_handle;
+};
+
+/* Response to NdisQueryRequest */
+struct rndis_query_complete {
+	u32 req_id;
+	u32 status;
+	u32 info_buflen;
+	u32 info_buf_offset;
+};
+
+/* NdisSetRequest message */
+struct rndis_set_request {
+	u32 req_id;
+	u32 oid;
+	u32 info_buflen;
+	u32 info_buf_offset;
+	u32 dev_vc_handle;
+};
+
+/* Response to NdisSetRequest */
+struct rndis_set_complete {
+	u32 req_id;
+	u32 status;
+};
+
+/* NdisReset message */
+struct rndis_reset_request {
+	u32 reserved;
+};
+
+/* Response to NdisReset */
+struct rndis_reset_complete {
+	u32 status;
+	u32 addressing_reset;
+};
+
+/* NdisMIndicateStatus message */
+struct rndis_indicate_status {
+	u32 status;
+	u32 status_buflen;
+	u32 status_buf_offset;
+};
+
+/* Diagnostic information passed as the status buffer in */
+/* struct rndis_indicate_status messages signifying error conditions. */
+struct rndis_diagnostic_info {
+	u32 diag_status;
+	u32 error_offset;
+};
+
+/* NdisKeepAlive message */
+struct rndis_keepalive_request {
+	u32 req_id;
+};
+
+/* Response to NdisKeepAlive */
+struct rndis_keepalive_complete {
+	u32 req_id;
+	u32 status;
+};
+
+/*
+ * Data message. All Offset fields contain byte offsets from the beginning of
+ * struct rndis_packet. All Length fields are in bytes.  VcHandle is set
+ * to 0 for connectionless data, otherwise it contains the VC handle.
+ */
+struct rndis_packet {
+	u32 data_offset;
+	u32 data_len;
+	u32 oob_data_offset;
+	u32 oob_data_len;
+	u32 num_oob_data_elements;
+	u32 per_pkt_info_offset;
+	u32 per_pkt_info_len;
+	u32 vc_handle;
+	u32 reserved;
+};
+
+/* Optional Out of Band data associated with a Data message. */
+struct rndis_oobd {
+	u32 size;
+	u32 type;
+	u32 class_info_offset;
+};
+
+/* Packet extension field contents associated with a Data message. */
+struct rndis_per_packet_info {
+	u32 size;
+	u32 type;
+	u32 per_pkt_info_offset;
+};
+
+/* Format of Information buffer passed in a SetRequest for the OID */
+/* OID_GEN_RNDIS_CONFIG_PARAMETER. */
+struct rndis_config_parameter_info {
+	u32 parameter_name_offset;
+	u32 parameter_name_length;
+	u32 parameter_type;
+	u32 parameter_value_offset;
+	u32 parameter_value_length;
+};
+
+/* Values for ParameterType in struct rndis_config_parameter_info */
+#define RNDIS_CONFIG_PARAM_TYPE_INTEGER     0
+#define RNDIS_CONFIG_PARAM_TYPE_STRING      2
+
+/* CONDIS Miniport messages for connection oriented devices */
+/* that do not implement a call manager. */
+
+/* CoNdisMiniportCreateVc message */
+struct rcondis_mp_create_vc {
+	u32 req_id;
+	u32 ndis_vc_handle;
+};
+
+/* Response to CoNdisMiniportCreateVc */
+struct rcondis_mp_create_vc_complete {
+	u32 req_id;
+	u32 dev_vc_handle;
+	u32 status;
+};
+
+/* CoNdisMiniportDeleteVc message */
+struct rcondis_mp_delete_vc {
+	u32 req_id;
+	u32 dev_vc_handle;
+};
+
+/* Response to CoNdisMiniportDeleteVc */
+struct rcondis_mp_delete_vc_complete {
+	u32 req_id;
+	u32 status;
+};
+
+/* CoNdisMiniportQueryRequest message */
+struct rcondis_mp_query_request {
+	u32 req_id;
+	u32 request_type;
+	u32 oid;
+	u32 dev_vc_handle;
+	u32 info_buflen;
+	u32 info_buf_offset;
+};
+
+/* CoNdisMiniportSetRequest message */
+struct rcondis_mp_set_request {
+	u32 req_id;
+	u32 request_type;
+	u32 oid;
+	u32 dev_vc_handle;
+	u32 info_buflen;
+	u32 info_buf_offset;
+};
+
+/* CoNdisIndicateStatus message */
+struct rcondis_indicate_status {
+	u32 ndis_vc_handle;
+	u32 status;
+	u32 status_buflen;
+	u32 status_buf_offset;
+};
+
+/* CONDIS Call/VC parameters */
+struct rcondis_specific_parameters {
+	u32 parameter_type;
+	u32 parameter_length;
+	u32 parameter_lffset;
+};
+
+struct rcondis_media_parameters {
+	u32 flags;
+	u32 reserved1;
+	u32 reserved2;
+	struct rcondis_specific_parameters media_specific;
+};
+
+struct rndis_flowspec {
+	u32 token_rate;
+	u32 token_bucket_size;
+	u32 peak_bandwidth;
+	u32 latency;
+	u32 delay_variation;
+	u32 service_type;
+	u32 max_sdu_size;
+	u32 minimum_policed_size;
+};
+
+struct rcondis_call_manager_parameters {
+	struct rndis_flowspec transmit;
+	struct rndis_flowspec receive;
+	struct rcondis_specific_parameters call_mgr_specific;
+};
+
+/* CoNdisMiniportActivateVc message */
+struct rcondis_mp_activate_vc_request {
+	u32 req_id;
+	u32 flags;
+	u32 dev_vc_handle;
+	u32 media_params_offset;
+	u32 media_params_length;
+	u32 call_mgr_params_offset;
+	u32 call_mgr_params_length;
+};
+
+/* Response to CoNdisMiniportActivateVc */
+struct rcondis_mp_activate_vc_complete {
+	u32 req_id;
+	u32 status;
+};
+
+/* CoNdisMiniportDeactivateVc message */
+struct rcondis_mp_deactivate_vc_request {
+	u32 req_id;
+	u32 flags;
+	u32 dev_vc_handle;
+};
+
+/* Response to CoNdisMiniportDeactivateVc */
+struct rcondis_mp_deactivate_vc_complete {
+	u32 req_id;
+	u32 status;
+};
+
+
+/* union with all of the RNDIS messages */
+union rndis_message_container {
+	struct rndis_packet pkt;
+	struct rndis_initialize_request init_req;
+	struct rndis_halt_request halt_req;
+	struct rndis_query_request query_req;
+	struct rndis_set_request set_req;
+	struct rndis_reset_request reset_req;
+	struct rndis_keepalive_request keep_alive_req;
+	struct rndis_indicate_status indicate_status;
+	struct rndis_initialize_complete init_complete;
+	struct rndis_query_complete query_complete;
+	struct rndis_set_complete set_complete;
+	struct rndis_reset_complete reset_complete;
+	struct rndis_keepalive_complete keep_alive_complete;
+	struct rcondis_mp_create_vc co_miniport_create_vc;
+	struct rcondis_mp_delete_vc co_miniport_delete_vc;
+	struct rcondis_indicate_status co_indicate_status;
+	struct rcondis_mp_activate_vc_request co_miniport_activate_vc;
+	struct rcondis_mp_deactivate_vc_request co_miniport_deactivate_vc;
+	struct rcondis_mp_create_vc_complete co_miniport_create_vc_complete;
+	struct rcondis_mp_delete_vc_complete co_miniport_delete_vc_complete;
+	struct rcondis_mp_activate_vc_complete co_miniport_activate_vc_complete;
+	struct rcondis_mp_deactivate_vc_complete
+		co_miniport_deactivate_vc_complete;
+};
+
+/* Remote NDIS message format */
+struct rndis_message {
+	u32 ndis_msg_type;
+
+	/* Total length of this message, from the beginning */
+	/* of the sruct rndis_message, in bytes. */
+	u32 msg_len;
+
+	/* Actual message */
+	union rndis_message_container msg;
+};
+
+
+struct rndis_filter_packet {
+	void *completion_ctx;
+	void (*completion)(void *context);
+	struct rndis_message msg;
+};
+
+/* Handy macros */
+
+/* get the size of an RNDIS message. Pass in the message type, */
+/* struct rndis_set_request, struct rndis_packet for example */
+#define RNDIS_MESSAGE_SIZE(msg)				\
+	(sizeof(msg) + (sizeof(struct rndis_message) -	\
+	 sizeof(union rndis_message_container)))
+
+/* get pointer to info buffer with message pointer */
+#define MESSAGE_TO_INFO_BUFFER(msg)				\
+	(((unsigned char *)(msg)) + msg->info_buf_offset)
+
+/* get pointer to status buffer with message pointer */
+#define MESSAGE_TO_STATUS_BUFFER(msg)			\
+	(((unsigned char *)(msg)) + msg->status_buf_offset)
+
+/* get pointer to OOBD buffer with message pointer */
+#define MESSAGE_TO_OOBD_BUFFER(msg)				\
+	(((unsigned char *)(msg)) + msg->oob_data_offset)
+
+/* get pointer to data buffer with message pointer */
+#define MESSAGE_TO_DATA_BUFFER(msg)				\
+	(((unsigned char *)(msg)) + msg->per_pkt_info_offset)
+
+/* get pointer to contained message from NDIS_MESSAGE pointer */
+#define RNDIS_MESSAGE_PTR_TO_MESSAGE_PTR(rndis_msg)		\
+	((void *) &rndis_msg->msg)
+
+/* get pointer to contained message from NDIS_MESSAGE pointer */
+#define RNDIS_MESSAGE_RAW_PTR_TO_MESSAGE_PTR(rndis_msg)	\
+	((void *) rndis_msg)
+
+
+#define __struct_bcount(x)
+
+
+
+#define RNDIS_HEADER_SIZE	(sizeof(struct rndis_message) - \
+				 sizeof(union rndis_message_container))
+
+#define NDIS_PACKET_TYPE_DIRECTED	0x00000001
+#define NDIS_PACKET_TYPE_MULTICAST	0x00000002
+#define NDIS_PACKET_TYPE_ALL_MULTICAST	0x00000004
+#define NDIS_PACKET_TYPE_BROADCAST	0x00000008
+#define NDIS_PACKET_TYPE_SOURCE_ROUTING	0x00000010
+#define NDIS_PACKET_TYPE_PROMISCUOUS	0x00000020
+#define NDIS_PACKET_TYPE_SMT		0x00000040
+#define NDIS_PACKET_TYPE_ALL_LOCAL	0x00000080
+#define NDIS_PACKET_TYPE_GROUP		0x00000100
+#define NDIS_PACKET_TYPE_ALL_FUNCTIONAL	0x00000200
+#define NDIS_PACKET_TYPE_FUNCTIONAL	0x00000400
+#define NDIS_PACKET_TYPE_MAC_FRAME	0x00000800
+
+
+
+#endif /* _HYPERV_NET_H */
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
new file mode 100644
index 0000000..28e69a6
--- /dev/null
+++ b/drivers/net/hyperv/netvsc.c
@@ -0,0 +1,939 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+
+#include "hyperv_net.h"
+
+
+static struct netvsc_device *alloc_net_device(struct hv_device *device)
+{
+	struct netvsc_device *net_device;
+	struct net_device *ndev = hv_get_drvdata(device);
+
+	net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
+	if (!net_device)
+		return NULL;
+
+
+	net_device->destroy = false;
+	net_device->dev = device;
+	net_device->ndev = ndev;
+
+	hv_set_drvdata(device, net_device);
+	return net_device;
+}
+
+static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
+{
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(device);
+	if (net_device && net_device->destroy)
+		net_device = NULL;
+
+	return net_device;
+}
+
+static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
+{
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(device);
+
+	if (!net_device)
+		goto get_in_err;
+
+	if (net_device->destroy &&
+		atomic_read(&net_device->num_outstanding_sends) == 0)
+		net_device = NULL;
+
+get_in_err:
+	return net_device;
+}
+
+
+static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
+{
+	struct nvsp_message *revoke_packet;
+	int ret = 0;
+	struct net_device *ndev = net_device->ndev;
+
+	/*
+	 * If we got a section count, it means we received a
+	 * SendReceiveBufferComplete msg (ie sent
+	 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
+	 * to send a revoke msg here
+	 */
+	if (net_device->recv_section_cnt) {
+		/* Send the revoke receive buffer */
+		revoke_packet = &net_device->revoke_packet;
+		memset(revoke_packet, 0, sizeof(struct nvsp_message));
+
+		revoke_packet->hdr.msg_type =
+			NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
+		revoke_packet->msg.v1_msg.
+		revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
+
+		ret = vmbus_sendpacket(net_device->dev->channel,
+				       revoke_packet,
+				       sizeof(struct nvsp_message),
+				       (unsigned long)revoke_packet,
+				       VM_PKT_DATA_INBAND, 0);
+		/*
+		 * If we failed here, we might as well return and
+		 * have a leak rather than continue and a bugchk
+		 */
+		if (ret != 0) {
+			netdev_err(ndev, "unable to send "
+				"revoke receive buffer to netvsp\n");
+			return ret;
+		}
+	}
+
+	/* Teardown the gpadl on the vsp end */
+	if (net_device->recv_buf_gpadl_handle) {
+		ret = vmbus_teardown_gpadl(net_device->dev->channel,
+			   net_device->recv_buf_gpadl_handle);
+
+		/* If we failed here, we might as well return and have a leak
+		 * rather than continue and a bugchk
+		 */
+		if (ret != 0) {
+			netdev_err(ndev,
+				   "unable to teardown receive buffer's gpadl\n");
+			return ret;
+		}
+		net_device->recv_buf_gpadl_handle = 0;
+	}
+
+	if (net_device->recv_buf) {
+		/* Free up the receive buffer */
+		free_pages((unsigned long)net_device->recv_buf,
+			get_order(net_device->recv_buf_size));
+		net_device->recv_buf = NULL;
+	}
+
+	if (net_device->recv_section) {
+		net_device->recv_section_cnt = 0;
+		kfree(net_device->recv_section);
+		net_device->recv_section = NULL;
+	}
+
+	return ret;
+}
+
+static int netvsc_init_recv_buf(struct hv_device *device)
+{
+	int ret = 0;
+	int t;
+	struct netvsc_device *net_device;
+	struct nvsp_message *init_packet;
+	struct net_device *ndev;
+
+	net_device = get_outbound_net_device(device);
+	if (!net_device)
+		return -ENODEV;
+	ndev = net_device->ndev;
+
+	net_device->recv_buf =
+		(void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
+				get_order(net_device->recv_buf_size));
+	if (!net_device->recv_buf) {
+		netdev_err(ndev, "unable to allocate receive "
+			"buffer of size %d\n", net_device->recv_buf_size);
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	/*
+	 * Establish the gpadl handle for this buffer on this
+	 * channel.  Note: This call uses the vmbus connection rather
+	 * than the channel to establish the gpadl handle.
+	 */
+	ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
+				    net_device->recv_buf_size,
+				    &net_device->recv_buf_gpadl_handle);
+	if (ret != 0) {
+		netdev_err(ndev,
+			"unable to establish receive buffer's gpadl\n");
+		goto cleanup;
+	}
+
+
+	/* Notify the NetVsp of the gpadl handle */
+	init_packet = &net_device->channel_init_pkt;
+
+	memset(init_packet, 0, sizeof(struct nvsp_message));
+
+	init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
+	init_packet->msg.v1_msg.send_recv_buf.
+		gpadl_handle = net_device->recv_buf_gpadl_handle;
+	init_packet->msg.v1_msg.
+		send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
+
+	/* Send the gpadl notification request */
+	ret = vmbus_sendpacket(device->channel, init_packet,
+			       sizeof(struct nvsp_message),
+			       (unsigned long)init_packet,
+			       VM_PKT_DATA_INBAND,
+			       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+	if (ret != 0) {
+		netdev_err(ndev,
+			"unable to send receive buffer's gpadl to netvsp\n");
+		goto cleanup;
+	}
+
+	t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
+	BUG_ON(t == 0);
+
+
+	/* Check the response */
+	if (init_packet->msg.v1_msg.
+	    send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
+		netdev_err(ndev, "Unable to complete receive buffer "
+			   "initialization with NetVsp - status %d\n",
+			   init_packet->msg.v1_msg.
+			   send_recv_buf_complete.status);
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	/* Parse the response */
+
+	net_device->recv_section_cnt = init_packet->msg.
+		v1_msg.send_recv_buf_complete.num_sections;
+
+	net_device->recv_section = kmemdup(init_packet->msg.v1_msg.send_recv_buf_complete.sections,
+					   net_device->recv_section_cnt * sizeof(struct nvsp_1_receive_buffer_section),
+					   GFP_KERNEL);
+	if (net_device->recv_section == NULL) {
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	/*
+	 * For 1st release, there should only be 1 section that represents the
+	 * entire receive buffer
+	 */
+	if (net_device->recv_section_cnt != 1 ||
+	    net_device->recv_section->offset != 0) {
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	goto exit;
+
+cleanup:
+	netvsc_destroy_recv_buf(net_device);
+
+exit:
+	return ret;
+}
+
+
+static int netvsc_connect_vsp(struct hv_device *device)
+{
+	int ret, t;
+	struct netvsc_device *net_device;
+	struct nvsp_message *init_packet;
+	int ndis_version;
+	struct net_device *ndev;
+
+	net_device = get_outbound_net_device(device);
+	if (!net_device)
+		return -ENODEV;
+	ndev = net_device->ndev;
+
+	init_packet = &net_device->channel_init_pkt;
+
+	memset(init_packet, 0, sizeof(struct nvsp_message));
+	init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
+	init_packet->msg.init_msg.init.min_protocol_ver =
+		NVSP_MIN_PROTOCOL_VERSION;
+	init_packet->msg.init_msg.init.max_protocol_ver =
+		NVSP_MAX_PROTOCOL_VERSION;
+
+	/* Send the init request */
+	ret = vmbus_sendpacket(device->channel, init_packet,
+			       sizeof(struct nvsp_message),
+			       (unsigned long)init_packet,
+			       VM_PKT_DATA_INBAND,
+			       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+	if (ret != 0)
+		goto cleanup;
+
+	t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
+
+	if (t == 0) {
+		ret = -ETIMEDOUT;
+		goto cleanup;
+	}
+
+	if (init_packet->msg.init_msg.init_complete.status !=
+	    NVSP_STAT_SUCCESS) {
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	if (init_packet->msg.init_msg.init_complete.
+	    negotiated_protocol_ver != NVSP_PROTOCOL_VERSION_1) {
+		ret = -EPROTO;
+		goto cleanup;
+	}
+	/* Send the ndis version */
+	memset(init_packet, 0, sizeof(struct nvsp_message));
+
+	ndis_version = 0x00050000;
+
+	init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
+	init_packet->msg.v1_msg.
+		send_ndis_ver.ndis_major_ver =
+				(ndis_version & 0xFFFF0000) >> 16;
+	init_packet->msg.v1_msg.
+		send_ndis_ver.ndis_minor_ver =
+				ndis_version & 0xFFFF;
+
+	/* Send the init request */
+	ret = vmbus_sendpacket(device->channel, init_packet,
+				sizeof(struct nvsp_message),
+				(unsigned long)init_packet,
+				VM_PKT_DATA_INBAND, 0);
+	if (ret != 0)
+		goto cleanup;
+
+	/* Post the big receive buffer to NetVSP */
+	ret = netvsc_init_recv_buf(device);
+
+cleanup:
+	return ret;
+}
+
+static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
+{
+	netvsc_destroy_recv_buf(net_device);
+}
+
+/*
+ * netvsc_device_remove - Callback when the root bus device is removed
+ */
+int netvsc_device_remove(struct hv_device *device)
+{
+	struct netvsc_device *net_device;
+	struct hv_netvsc_packet *netvsc_packet, *pos;
+	unsigned long flags;
+
+	net_device = hv_get_drvdata(device);
+	spin_lock_irqsave(&device->channel->inbound_lock, flags);
+	net_device->destroy = true;
+	spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+	/* Wait for all send completions */
+	while (atomic_read(&net_device->num_outstanding_sends)) {
+		dev_info(&device->device,
+			"waiting for %d requests to complete...\n",
+			atomic_read(&net_device->num_outstanding_sends));
+		udelay(100);
+	}
+
+	netvsc_disconnect_vsp(net_device);
+
+	/*
+	 * Since we have already drained, we don't need to busy wait
+	 * as was done in final_release_stor_device()
+	 * Note that we cannot set the ext pointer to NULL until
+	 * we have drained - to drain the outgoing packets, we need to
+	 * allow incoming packets.
+	 */
+
+	spin_lock_irqsave(&device->channel->inbound_lock, flags);
+	hv_set_drvdata(device, NULL);
+	spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+	/*
+	 * At this point, no one should be accessing net_device
+	 * except in here
+	 */
+	dev_notice(&device->device, "net device safe to remove\n");
+
+	/* Now, we can close the channel safely */
+	vmbus_close(device->channel);
+
+	/* Release all resources */
+	list_for_each_entry_safe(netvsc_packet, pos,
+				 &net_device->recv_pkt_list, list_ent) {
+		list_del(&netvsc_packet->list_ent);
+		kfree(netvsc_packet);
+	}
+
+	kfree(net_device);
+	return 0;
+}
+
+static void netvsc_send_completion(struct hv_device *device,
+				   struct vmpacket_descriptor *packet)
+{
+	struct netvsc_device *net_device;
+	struct nvsp_message *nvsp_packet;
+	struct hv_netvsc_packet *nvsc_packet;
+	struct net_device *ndev;
+
+	net_device = get_inbound_net_device(device);
+	if (!net_device)
+		return;
+	ndev = net_device->ndev;
+
+	nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
+			(packet->offset8 << 3));
+
+	if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
+	    (nvsp_packet->hdr.msg_type ==
+	     NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
+	    (nvsp_packet->hdr.msg_type ==
+	     NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
+		/* Copy the response back */
+		memcpy(&net_device->channel_init_pkt, nvsp_packet,
+		       sizeof(struct nvsp_message));
+		complete(&net_device->channel_init_wait);
+	} else if (nvsp_packet->hdr.msg_type ==
+		   NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
+		/* Get the send context */
+		nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
+			packet->trans_id;
+
+		/* Notify the layer above us */
+		nvsc_packet->completion.send.send_completion(
+			nvsc_packet->completion.send.send_completion_ctx);
+
+		atomic_dec(&net_device->num_outstanding_sends);
+	} else {
+		netdev_err(ndev, "Unknown send completion packet type- "
+			   "%d received!!\n", nvsp_packet->hdr.msg_type);
+	}
+
+}
+
+int netvsc_send(struct hv_device *device,
+			struct hv_netvsc_packet *packet)
+{
+	struct netvsc_device *net_device;
+	int ret = 0;
+	struct nvsp_message sendMessage;
+	struct net_device *ndev;
+
+	net_device = get_outbound_net_device(device);
+	if (!net_device)
+		return -ENODEV;
+	ndev = net_device->ndev;
+
+	sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
+	if (packet->is_data_pkt) {
+		/* 0 is RMC_DATA; */
+		sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
+	} else {
+		/* 1 is RMC_CONTROL; */
+		sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
+	}
+
+	/* Not using send buffer section */
+	sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
+		0xFFFFFFFF;
+	sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
+
+	if (packet->page_buf_cnt) {
+		ret = vmbus_sendpacket_pagebuffer(device->channel,
+						  packet->page_buf,
+						  packet->page_buf_cnt,
+						  &sendMessage,
+						  sizeof(struct nvsp_message),
+						  (unsigned long)packet);
+	} else {
+		ret = vmbus_sendpacket(device->channel, &sendMessage,
+				sizeof(struct nvsp_message),
+				(unsigned long)packet,
+				VM_PKT_DATA_INBAND,
+				VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+	}
+
+	if (ret != 0)
+		netdev_err(ndev, "Unable to send packet %p ret %d\n",
+			   packet, ret);
+	else
+		atomic_inc(&net_device->num_outstanding_sends);
+
+	return ret;
+}
+
+static void netvsc_send_recv_completion(struct hv_device *device,
+					u64 transaction_id)
+{
+	struct nvsp_message recvcompMessage;
+	int retries = 0;
+	int ret;
+	struct net_device *ndev;
+	struct netvsc_device *net_device = hv_get_drvdata(device);
+
+	ndev = net_device->ndev;
+
+	recvcompMessage.hdr.msg_type =
+				NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
+
+	/* FIXME: Pass in the status */
+	recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
+		NVSP_STAT_SUCCESS;
+
+retry_send_cmplt:
+	/* Send the completion */
+	ret = vmbus_sendpacket(device->channel, &recvcompMessage,
+			       sizeof(struct nvsp_message), transaction_id,
+			       VM_PKT_COMP, 0);
+	if (ret == 0) {
+		/* success */
+		/* no-op */
+	} else if (ret == -EAGAIN) {
+		/* no more room...wait a bit and attempt to retry 3 times */
+		retries++;
+		netdev_err(ndev, "unable to send receive completion pkt"
+			" (tid %llx)...retrying %d\n", transaction_id, retries);
+
+		if (retries < 4) {
+			udelay(100);
+			goto retry_send_cmplt;
+		} else {
+			netdev_err(ndev, "unable to send receive "
+				"completion pkt (tid %llx)...give up retrying\n",
+				transaction_id);
+		}
+	} else {
+		netdev_err(ndev, "unable to send receive "
+			"completion pkt - %llx\n", transaction_id);
+	}
+}
+
+/* Send a receive completion packet to RNDIS device (ie NetVsp) */
+static void netvsc_receive_completion(void *context)
+{
+	struct hv_netvsc_packet *packet = context;
+	struct hv_device *device = (struct hv_device *)packet->device;
+	struct netvsc_device *net_device;
+	u64 transaction_id = 0;
+	bool fsend_receive_comp = false;
+	unsigned long flags;
+	struct net_device *ndev;
+
+	/*
+	 * Even though it seems logical to do a GetOutboundNetDevice() here to
+	 * send out receive completion, we are using GetInboundNetDevice()
+	 * since we may have disable outbound traffic already.
+	 */
+	net_device = get_inbound_net_device(device);
+	if (!net_device)
+		return;
+	ndev = net_device->ndev;
+
+	/* Overloading use of the lock. */
+	spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
+
+	packet->xfer_page_pkt->count--;
+
+	/*
+	 * Last one in the line that represent 1 xfer page packet.
+	 * Return the xfer page packet itself to the freelist
+	 */
+	if (packet->xfer_page_pkt->count == 0) {
+		fsend_receive_comp = true;
+		transaction_id = packet->completion.recv.recv_completion_tid;
+		list_add_tail(&packet->xfer_page_pkt->list_ent,
+			      &net_device->recv_pkt_list);
+
+	}
+
+	/* Put the packet back */
+	list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
+	spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
+
+	/* Send a receive completion for the xfer page packet */
+	if (fsend_receive_comp)
+		netvsc_send_recv_completion(device, transaction_id);
+
+}
+
+static void netvsc_receive(struct hv_device *device,
+			    struct vmpacket_descriptor *packet)
+{
+	struct netvsc_device *net_device;
+	struct vmtransfer_page_packet_header *vmxferpage_packet;
+	struct nvsp_message *nvsp_packet;
+	struct hv_netvsc_packet *netvsc_packet = NULL;
+	unsigned long start;
+	unsigned long end, end_virtual;
+	/* struct netvsc_driver *netvscDriver; */
+	struct xferpage_packet *xferpage_packet = NULL;
+	int i, j;
+	int count = 0, bytes_remain = 0;
+	unsigned long flags;
+	struct net_device *ndev;
+
+	LIST_HEAD(listHead);
+
+	net_device = get_inbound_net_device(device);
+	if (!net_device)
+		return;
+	ndev = net_device->ndev;
+
+	/*
+	 * All inbound packets other than send completion should be xfer page
+	 * packet
+	 */
+	if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
+		netdev_err(ndev, "Unknown packet type received - %d\n",
+			   packet->type);
+		return;
+	}
+
+	nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
+			(packet->offset8 << 3));
+
+	/* Make sure this is a valid nvsp packet */
+	if (nvsp_packet->hdr.msg_type !=
+	    NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
+		netdev_err(ndev, "Unknown nvsp packet type received-"
+			" %d\n", nvsp_packet->hdr.msg_type);
+		return;
+	}
+
+	vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
+
+	if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
+		netdev_err(ndev, "Invalid xfer page set id - "
+			   "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
+			   vmxferpage_packet->xfer_pageset_id);
+		return;
+	}
+
+	/*
+	 * Grab free packets (range count + 1) to represent this xfer
+	 * page packet. +1 to represent the xfer page packet itself.
+	 * We grab it here so that we know exactly how many we can
+	 * fulfil
+	 */
+	spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
+	while (!list_empty(&net_device->recv_pkt_list)) {
+		list_move_tail(net_device->recv_pkt_list.next, &listHead);
+		if (++count == vmxferpage_packet->range_cnt + 1)
+			break;
+	}
+	spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
+
+	/*
+	 * We need at least 2 netvsc pkts (1 to represent the xfer
+	 * page and at least 1 for the range) i.e. we can handled
+	 * some of the xfer page packet ranges...
+	 */
+	if (count < 2) {
+		netdev_err(ndev, "Got only %d netvsc pkt...needed "
+			"%d pkts. Dropping this xfer page packet completely!\n",
+			count, vmxferpage_packet->range_cnt + 1);
+
+		/* Return it to the freelist */
+		spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
+		for (i = count; i != 0; i--) {
+			list_move_tail(listHead.next,
+				       &net_device->recv_pkt_list);
+		}
+		spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
+				       flags);
+
+		netvsc_send_recv_completion(device,
+					    vmxferpage_packet->d.trans_id);
+
+		return;
+	}
+
+	/* Remove the 1st packet to represent the xfer page packet itself */
+	xferpage_packet = (struct xferpage_packet *)listHead.next;
+	list_del(&xferpage_packet->list_ent);
+
+	/* This is how much we can satisfy */
+	xferpage_packet->count = count - 1;
+
+	if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
+		netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
+			"this xfer page...got %d\n",
+			vmxferpage_packet->range_cnt, xferpage_packet->count);
+	}
+
+	/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
+	for (i = 0; i < (count - 1); i++) {
+		netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
+		list_del(&netvsc_packet->list_ent);
+
+		/* Initialize the netvsc packet */
+		netvsc_packet->xfer_page_pkt = xferpage_packet;
+		netvsc_packet->completion.recv.recv_completion =
+					netvsc_receive_completion;
+		netvsc_packet->completion.recv.recv_completion_ctx =
+					netvsc_packet;
+		netvsc_packet->device = device;
+		/* Save this so that we can send it back */
+		netvsc_packet->completion.recv.recv_completion_tid =
+					vmxferpage_packet->d.trans_id;
+
+		netvsc_packet->total_data_buflen =
+					vmxferpage_packet->ranges[i].byte_count;
+		netvsc_packet->page_buf_cnt = 1;
+
+		netvsc_packet->page_buf[0].len =
+					vmxferpage_packet->ranges[i].byte_count;
+
+		start = virt_to_phys((void *)((unsigned long)net_device->
+		recv_buf + vmxferpage_packet->ranges[i].byte_offset));
+
+		netvsc_packet->page_buf[0].pfn = start >> PAGE_SHIFT;
+		end_virtual = (unsigned long)net_device->recv_buf
+		    + vmxferpage_packet->ranges[i].byte_offset
+		    + vmxferpage_packet->ranges[i].byte_count - 1;
+		end = virt_to_phys((void *)end_virtual);
+
+		/* Calculate the page relative offset */
+		netvsc_packet->page_buf[0].offset =
+			vmxferpage_packet->ranges[i].byte_offset &
+			(PAGE_SIZE - 1);
+		if ((end >> PAGE_SHIFT) != (start >> PAGE_SHIFT)) {
+			/* Handle frame across multiple pages: */
+			netvsc_packet->page_buf[0].len =
+				(netvsc_packet->page_buf[0].pfn <<
+				 PAGE_SHIFT)
+				+ PAGE_SIZE - start;
+			bytes_remain = netvsc_packet->total_data_buflen -
+					netvsc_packet->page_buf[0].len;
+			for (j = 1; j < NETVSC_PACKET_MAXPAGE; j++) {
+				netvsc_packet->page_buf[j].offset = 0;
+				if (bytes_remain <= PAGE_SIZE) {
+					netvsc_packet->page_buf[j].len =
+						bytes_remain;
+					bytes_remain = 0;
+				} else {
+					netvsc_packet->page_buf[j].len =
+						PAGE_SIZE;
+					bytes_remain -= PAGE_SIZE;
+				}
+				netvsc_packet->page_buf[j].pfn =
+				    virt_to_phys((void *)(end_virtual -
+						bytes_remain)) >> PAGE_SHIFT;
+				netvsc_packet->page_buf_cnt++;
+				if (bytes_remain == 0)
+					break;
+			}
+		}
+
+		/* Pass it to the upper layer */
+		rndis_filter_receive(device, netvsc_packet);
+
+		netvsc_receive_completion(netvsc_packet->
+				completion.recv.recv_completion_ctx);
+	}
+
+}
+
+static void netvsc_channel_cb(void *context)
+{
+	int ret;
+	struct hv_device *device = context;
+	struct netvsc_device *net_device;
+	u32 bytes_recvd;
+	u64 request_id;
+	unsigned char *packet;
+	struct vmpacket_descriptor *desc;
+	unsigned char *buffer;
+	int bufferlen = NETVSC_PACKET_SIZE;
+	struct net_device *ndev;
+
+	packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
+			 GFP_ATOMIC);
+	if (!packet)
+		return;
+	buffer = packet;
+
+	net_device = get_inbound_net_device(device);
+	if (!net_device)
+		goto out;
+	ndev = net_device->ndev;
+
+	do {
+		ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
+					   &bytes_recvd, &request_id);
+		if (ret == 0) {
+			if (bytes_recvd > 0) {
+				desc = (struct vmpacket_descriptor *)buffer;
+				switch (desc->type) {
+				case VM_PKT_COMP:
+					netvsc_send_completion(device, desc);
+					break;
+
+				case VM_PKT_DATA_USING_XFER_PAGES:
+					netvsc_receive(device, desc);
+					break;
+
+				default:
+					netdev_err(ndev,
+						   "unhandled packet type %d, "
+						   "tid %llx len %d\n",
+						   desc->type, request_id,
+						   bytes_recvd);
+					break;
+				}
+
+				/* reset */
+				if (bufferlen > NETVSC_PACKET_SIZE) {
+					kfree(buffer);
+					buffer = packet;
+					bufferlen = NETVSC_PACKET_SIZE;
+				}
+			} else {
+				/* reset */
+				if (bufferlen > NETVSC_PACKET_SIZE) {
+					kfree(buffer);
+					buffer = packet;
+					bufferlen = NETVSC_PACKET_SIZE;
+				}
+
+				break;
+			}
+		} else if (ret == -ENOBUFS) {
+			/* Handle large packet */
+			buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
+			if (buffer == NULL) {
+				/* Try again next time around */
+				netdev_err(ndev,
+					   "unable to allocate buffer of size "
+					   "(%d)!!\n", bytes_recvd);
+				break;
+			}
+
+			bufferlen = bytes_recvd;
+		}
+	} while (1);
+
+out:
+	kfree(buffer);
+	return;
+}
+
+/*
+ * netvsc_device_add - Callback when the device belonging to this
+ * driver is added
+ */
+int netvsc_device_add(struct hv_device *device, void *additional_info)
+{
+	int ret = 0;
+	int i;
+	int ring_size =
+	((struct netvsc_device_info *)additional_info)->ring_size;
+	struct netvsc_device *net_device;
+	struct hv_netvsc_packet *packet, *pos;
+	struct net_device *ndev;
+
+	net_device = alloc_net_device(device);
+	if (!net_device) {
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	/*
+	 * Coming into this function, struct net_device * is
+	 * registered as the driver private data.
+	 * In alloc_net_device(), we register struct netvsc_device *
+	 * as the driver private data and stash away struct net_device *
+	 * in struct netvsc_device *.
+	 */
+	ndev = net_device->ndev;
+
+	/* Initialize the NetVSC channel extension */
+	net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
+	spin_lock_init(&net_device->recv_pkt_list_lock);
+
+	INIT_LIST_HEAD(&net_device->recv_pkt_list);
+
+	for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
+		packet = kzalloc(sizeof(struct hv_netvsc_packet) +
+				 (NETVSC_RECEIVE_SG_COUNT *
+				  sizeof(struct hv_page_buffer)), GFP_KERNEL);
+		if (!packet)
+			break;
+
+		list_add_tail(&packet->list_ent,
+			      &net_device->recv_pkt_list);
+	}
+	init_completion(&net_device->channel_init_wait);
+
+	/* Open the channel */
+	ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
+			 ring_size * PAGE_SIZE, NULL, 0,
+			 netvsc_channel_cb, device);
+
+	if (ret != 0) {
+		netdev_err(ndev, "unable to open channel: %d\n", ret);
+		goto cleanup;
+	}
+
+	/* Channel is opened */
+	pr_info("hv_netvsc channel opened successfully\n");
+
+	/* Connect with the NetVsp */
+	ret = netvsc_connect_vsp(device);
+	if (ret != 0) {
+		netdev_err(ndev,
+			"unable to connect to NetVSP - %d\n", ret);
+		goto close;
+	}
+
+	return ret;
+
+close:
+	/* Now, we can close the channel safely */
+	vmbus_close(device->channel);
+
+cleanup:
+
+	if (net_device) {
+		list_for_each_entry_safe(packet, pos,
+					 &net_device->recv_pkt_list,
+					 list_ent) {
+			list_del(&packet->list_ent);
+			kfree(packet);
+		}
+
+		kfree(net_device);
+	}
+
+	return ret;
+}
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
new file mode 100644
index 0000000..93b0e91
--- /dev/null
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -0,0 +1,456 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/atomic.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <net/arp.h>
+#include <net/route.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+
+#include "hyperv_net.h"
+
+struct net_device_context {
+	/* point back to our device context */
+	struct hv_device *device_ctx;
+	atomic_t avail;
+	struct delayed_work dwork;
+};
+
+
+#define PACKET_PAGES_LOWATER  8
+/* Need this many pages to handle worst case fragmented packet */
+#define PACKET_PAGES_HIWATER  (MAX_SKB_FRAGS + 2)
+
+static int ring_size = 128;
+module_param(ring_size, int, S_IRUGO);
+MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
+
+/* no-op so the netdev core doesn't return -EINVAL when modifying the the
+ * multicast address list in SIOCADDMULTI. hv is setup to get all multicast
+ * when it calls RndisFilterOnOpen() */
+static void netvsc_set_multicast_list(struct net_device *net)
+{
+}
+
+static int netvsc_open(struct net_device *net)
+{
+	struct net_device_context *net_device_ctx = netdev_priv(net);
+	struct hv_device *device_obj = net_device_ctx->device_ctx;
+	int ret = 0;
+
+	/* Open up the device */
+	ret = rndis_filter_open(device_obj);
+	if (ret != 0) {
+		netdev_err(net, "unable to open device (ret %d).\n", ret);
+		return ret;
+	}
+
+	netif_start_queue(net);
+
+	return ret;
+}
+
+static int netvsc_close(struct net_device *net)
+{
+	struct net_device_context *net_device_ctx = netdev_priv(net);
+	struct hv_device *device_obj = net_device_ctx->device_ctx;
+	int ret;
+
+	netif_stop_queue(net);
+
+	ret = rndis_filter_close(device_obj);
+	if (ret != 0)
+		netdev_err(net, "unable to close device (ret %d).\n", ret);
+
+	return ret;
+}
+
+static void netvsc_xmit_completion(void *context)
+{
+	struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
+	struct sk_buff *skb = (struct sk_buff *)
+		(unsigned long)packet->completion.send.send_completion_tid;
+
+	kfree(packet);
+
+	if (skb) {
+		struct net_device *net = skb->dev;
+		struct net_device_context *net_device_ctx = netdev_priv(net);
+		unsigned int num_pages = skb_shinfo(skb)->nr_frags + 2;
+
+		dev_kfree_skb_any(skb);
+
+		atomic_add(num_pages, &net_device_ctx->avail);
+		if (atomic_read(&net_device_ctx->avail) >=
+				PACKET_PAGES_HIWATER)
+			netif_wake_queue(net);
+	}
+}
+
+static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
+{
+	struct net_device_context *net_device_ctx = netdev_priv(net);
+	struct hv_netvsc_packet *packet;
+	int ret;
+	unsigned int i, num_pages;
+
+	/* Add 1 for skb->data and additional one for RNDIS */
+	num_pages = skb_shinfo(skb)->nr_frags + 1 + 1;
+	if (num_pages > atomic_read(&net_device_ctx->avail))
+		return NETDEV_TX_BUSY;
+
+	/* Allocate a netvsc packet based on # of frags. */
+	packet = kzalloc(sizeof(struct hv_netvsc_packet) +
+			 (num_pages * sizeof(struct hv_page_buffer)) +
+			 sizeof(struct rndis_filter_packet), GFP_ATOMIC);
+	if (!packet) {
+		/* out of memory, drop packet */
+		netdev_err(net, "unable to allocate hv_netvsc_packet\n");
+
+		dev_kfree_skb(skb);
+		net->stats.tx_dropped++;
+		return NETDEV_TX_BUSY;
+	}
+
+	packet->extension = (void *)(unsigned long)packet +
+				sizeof(struct hv_netvsc_packet) +
+				    (num_pages * sizeof(struct hv_page_buffer));
+
+	/* Setup the rndis header */
+	packet->page_buf_cnt = num_pages;
+
+	/* Initialize it from the skb */
+	packet->total_data_buflen	= skb->len;
+
+	/* Start filling in the page buffers starting after RNDIS buffer. */
+	packet->page_buf[1].pfn = virt_to_phys(skb->data) >> PAGE_SHIFT;
+	packet->page_buf[1].offset
+		= (unsigned long)skb->data & (PAGE_SIZE - 1);
+	packet->page_buf[1].len = skb_headlen(skb);
+
+	/* Additional fragments are after SKB data */
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+		const skb_frag_t *f = &skb_shinfo(skb)->frags[i];
+
+		packet->page_buf[i+2].pfn = page_to_pfn(skb_frag_page(f));
+		packet->page_buf[i+2].offset = f->page_offset;
+		packet->page_buf[i+2].len = skb_frag_size(f);
+	}
+
+	/* Set the completion routine */
+	packet->completion.send.send_completion = netvsc_xmit_completion;
+	packet->completion.send.send_completion_ctx = packet;
+	packet->completion.send.send_completion_tid = (unsigned long)skb;
+
+	ret = rndis_filter_send(net_device_ctx->device_ctx,
+				  packet);
+	if (ret == 0) {
+		net->stats.tx_bytes += skb->len;
+		net->stats.tx_packets++;
+
+		atomic_sub(num_pages, &net_device_ctx->avail);
+		if (atomic_read(&net_device_ctx->avail) < PACKET_PAGES_LOWATER)
+			netif_stop_queue(net);
+	} else {
+		/* we are shutting down or bus overloaded, just drop packet */
+		net->stats.tx_dropped++;
+		kfree(packet);
+		dev_kfree_skb_any(skb);
+	}
+
+	return ret ? NETDEV_TX_BUSY : NETDEV_TX_OK;
+}
+
+/*
+ * netvsc_linkstatus_callback - Link up/down notification
+ */
+void netvsc_linkstatus_callback(struct hv_device *device_obj,
+				       unsigned int status)
+{
+	struct net_device *net;
+	struct net_device_context *ndev_ctx;
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(device_obj);
+	net = net_device->ndev;
+
+	if (!net) {
+		netdev_err(net, "got link status but net device "
+				"not initialized yet\n");
+		return;
+	}
+
+	if (status == 1) {
+		netif_carrier_on(net);
+		netif_wake_queue(net);
+		ndev_ctx = netdev_priv(net);
+		schedule_delayed_work(&ndev_ctx->dwork, 0);
+		schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
+	} else {
+		netif_carrier_off(net);
+		netif_stop_queue(net);
+	}
+}
+
+/*
+ * netvsc_recv_callback -  Callback when we receive a packet from the
+ * "wire" on the specified device.
+ */
+int netvsc_recv_callback(struct hv_device *device_obj,
+				struct hv_netvsc_packet *packet)
+{
+	struct net_device *net = dev_get_drvdata(&device_obj->device);
+	struct sk_buff *skb;
+	void *data;
+	int i;
+	unsigned long flags;
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(device_obj);
+	net = net_device->ndev;
+
+	if (!net) {
+		netdev_err(net, "got receive callback but net device"
+			" not initialized yet\n");
+		return 0;
+	}
+
+	/* Allocate a skb - TODO direct I/O to pages? */
+	skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
+	if (unlikely(!skb)) {
+		++net->stats.rx_dropped;
+		return 0;
+	}
+
+	/* for kmap_atomic */
+	local_irq_save(flags);
+
+	/*
+	 * Copy to skb. This copy is needed here since the memory pointed by
+	 * hv_netvsc_packet cannot be deallocated
+	 */
+	for (i = 0; i < packet->page_buf_cnt; i++) {
+		data = kmap_atomic(pfn_to_page(packet->page_buf[i].pfn),
+					       KM_IRQ1);
+		data = (void *)(unsigned long)data +
+				packet->page_buf[i].offset;
+
+		memcpy(skb_put(skb, packet->page_buf[i].len), data,
+		       packet->page_buf[i].len);
+
+		kunmap_atomic((void *)((unsigned long)data -
+				       packet->page_buf[i].offset), KM_IRQ1);
+	}
+
+	local_irq_restore(flags);
+
+	skb->protocol = eth_type_trans(skb, net);
+	skb->ip_summed = CHECKSUM_NONE;
+
+	net->stats.rx_packets++;
+	net->stats.rx_bytes += skb->len;
+
+	/*
+	 * Pass the skb back up. Network stack will deallocate the skb when it
+	 * is done.
+	 * TODO - use NAPI?
+	 */
+	netif_rx(skb);
+
+	return 0;
+}
+
+static void netvsc_get_drvinfo(struct net_device *net,
+			       struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, "hv_netvsc");
+	strcpy(info->version, HV_DRV_VERSION);
+	strcpy(info->fw_version, "N/A");
+}
+
+static const struct ethtool_ops ethtool_ops = {
+	.get_drvinfo	= netvsc_get_drvinfo,
+	.get_link	= ethtool_op_get_link,
+};
+
+static const struct net_device_ops device_ops = {
+	.ndo_open =			netvsc_open,
+	.ndo_stop =			netvsc_close,
+	.ndo_start_xmit =		netvsc_start_xmit,
+	.ndo_set_rx_mode =		netvsc_set_multicast_list,
+	.ndo_change_mtu =		eth_change_mtu,
+	.ndo_validate_addr =		eth_validate_addr,
+	.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 delayed 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;
+	struct netvsc_device *net_device;
+
+	ndev_ctx = container_of(w, struct net_device_context, dwork.work);
+	net_device = hv_get_drvdata(ndev_ctx->device_ctx);
+	net = net_device->ndev;
+	netif_notify_peers(net);
+}
+
+
+static int netvsc_probe(struct hv_device *dev,
+			const struct hv_vmbus_device_id *dev_id)
+{
+	struct net_device *net = NULL;
+	struct net_device_context *net_device_ctx;
+	struct netvsc_device_info device_info;
+	int ret;
+
+	net = alloc_etherdev(sizeof(struct net_device_context));
+	if (!net)
+		return -ENOMEM;
+
+	/* Set initial state */
+	netif_carrier_off(net);
+
+	net_device_ctx = netdev_priv(net);
+	net_device_ctx->device_ctx = dev;
+	atomic_set(&net_device_ctx->avail, ring_size);
+	hv_set_drvdata(dev, net);
+	INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);
+
+	net->netdev_ops = &device_ops;
+
+	/* TODO: Add GSO and Checksum offload */
+	net->hw_features = NETIF_F_SG;
+	net->features = NETIF_F_SG;
+
+	SET_ETHTOOL_OPS(net, &ethtool_ops);
+	SET_NETDEV_DEV(net, &dev->device);
+
+	ret = register_netdev(net);
+	if (ret != 0) {
+		pr_err("Unable to register netdev.\n");
+		free_netdev(net);
+		goto out;
+	}
+
+	/* Notify the netvsc driver of the new device */
+	device_info.ring_size = ring_size;
+	ret = rndis_filter_device_add(dev, &device_info);
+	if (ret != 0) {
+		netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
+		unregister_netdev(net);
+		free_netdev(net);
+		hv_set_drvdata(dev, NULL);
+		return ret;
+	}
+	memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
+
+	netif_carrier_on(net);
+
+out:
+	return ret;
+}
+
+static int netvsc_remove(struct hv_device *dev)
+{
+	struct net_device *net;
+	struct net_device_context *ndev_ctx;
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(dev);
+	net = net_device->ndev;
+
+	if (net == NULL) {
+		dev_err(&dev->device, "No net device to remove\n");
+		return 0;
+	}
+
+	ndev_ctx = netdev_priv(net);
+	cancel_delayed_work_sync(&ndev_ctx->dwork);
+
+	/* Stop outbound asap */
+	netif_stop_queue(net);
+
+	unregister_netdev(net);
+
+	/*
+	 * Call to the vsc driver to let it know that the device is being
+	 * removed
+	 */
+	rndis_filter_device_remove(dev);
+
+	free_netdev(net);
+	return 0;
+}
+
+static const struct hv_vmbus_device_id id_table[] = {
+	/* Network guid */
+	{ VMBUS_DEVICE(0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
+		       0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E) },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(vmbus, id_table);
+
+/* The one and only one */
+static struct  hv_driver netvsc_drv = {
+	.name = "netvsc",
+	.id_table = id_table,
+	.probe = netvsc_probe,
+	.remove = netvsc_remove,
+};
+
+static void __exit netvsc_drv_exit(void)
+{
+	vmbus_driver_unregister(&netvsc_drv);
+}
+
+static int __init netvsc_drv_init(void)
+{
+	return vmbus_driver_register(&netvsc_drv);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(HV_DRV_VERSION);
+MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
+
+module_init(netvsc_drv_init);
+module_exit(netvsc_drv_exit);
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
new file mode 100644
index 0000000..bafccb3
--- /dev/null
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -0,0 +1,855 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/highmem.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+
+#include "hyperv_net.h"
+
+
+enum rndis_device_state {
+	RNDIS_DEV_UNINITIALIZED = 0,
+	RNDIS_DEV_INITIALIZING,
+	RNDIS_DEV_INITIALIZED,
+	RNDIS_DEV_DATAINITIALIZED,
+};
+
+struct rndis_device {
+	struct netvsc_device *net_dev;
+
+	enum rndis_device_state state;
+	bool link_state;
+	atomic_t new_req_id;
+
+	spinlock_t request_lock;
+	struct list_head req_list;
+
+	unsigned char hw_mac_adr[ETH_ALEN];
+};
+
+struct rndis_request {
+	struct list_head list_ent;
+	struct completion  wait_event;
+
+	/*
+	 * FIXME: We assumed a fixed size response here. If we do ever need to
+	 * handle a bigger response, we can either define a max response
+	 * message or add a response buffer variable above this field
+	 */
+	struct rndis_message response_msg;
+
+	/* Simplify allocation by having a netvsc packet inline */
+	struct hv_netvsc_packet	pkt;
+	struct hv_page_buffer buf;
+	/* FIXME: We assumed a fixed size request here. */
+	struct rndis_message request_msg;
+};
+
+static void rndis_filter_send_completion(void *ctx);
+
+static void rndis_filter_send_request_completion(void *ctx);
+
+
+
+static struct rndis_device *get_rndis_device(void)
+{
+	struct rndis_device *device;
+
+	device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
+	if (!device)
+		return NULL;
+
+	spin_lock_init(&device->request_lock);
+
+	INIT_LIST_HEAD(&device->req_list);
+
+	device->state = RNDIS_DEV_UNINITIALIZED;
+
+	return device;
+}
+
+static struct rndis_request *get_rndis_request(struct rndis_device *dev,
+					     u32 msg_type,
+					     u32 msg_len)
+{
+	struct rndis_request *request;
+	struct rndis_message *rndis_msg;
+	struct rndis_set_request *set;
+	unsigned long flags;
+
+	request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
+	if (!request)
+		return NULL;
+
+	init_completion(&request->wait_event);
+
+	rndis_msg = &request->request_msg;
+	rndis_msg->ndis_msg_type = msg_type;
+	rndis_msg->msg_len = msg_len;
+
+	/*
+	 * Set the request id. This field is always after the rndis header for
+	 * request/response packet types so we just used the SetRequest as a
+	 * template
+	 */
+	set = &rndis_msg->msg.set_req;
+	set->req_id = atomic_inc_return(&dev->new_req_id);
+
+	/* Add to the request list */
+	spin_lock_irqsave(&dev->request_lock, flags);
+	list_add_tail(&request->list_ent, &dev->req_list);
+	spin_unlock_irqrestore(&dev->request_lock, flags);
+
+	return request;
+}
+
+static void put_rndis_request(struct rndis_device *dev,
+			    struct rndis_request *req)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->request_lock, flags);
+	list_del(&req->list_ent);
+	spin_unlock_irqrestore(&dev->request_lock, flags);
+
+	kfree(req);
+}
+
+static void dump_rndis_message(struct hv_device *hv_dev,
+			struct rndis_message *rndis_msg)
+{
+	struct net_device *netdev;
+	struct netvsc_device *net_device;
+
+	net_device = hv_get_drvdata(hv_dev);
+	netdev = net_device->ndev;
+
+	switch (rndis_msg->ndis_msg_type) {
+	case REMOTE_NDIS_PACKET_MSG:
+		netdev_dbg(netdev, "REMOTE_NDIS_PACKET_MSG (len %u, "
+			   "data offset %u data len %u, # oob %u, "
+			   "oob offset %u, oob len %u, pkt offset %u, "
+			   "pkt len %u\n",
+			   rndis_msg->msg_len,
+			   rndis_msg->msg.pkt.data_offset,
+			   rndis_msg->msg.pkt.data_len,
+			   rndis_msg->msg.pkt.num_oob_data_elements,
+			   rndis_msg->msg.pkt.oob_data_offset,
+			   rndis_msg->msg.pkt.oob_data_len,
+			   rndis_msg->msg.pkt.per_pkt_info_offset,
+			   rndis_msg->msg.pkt.per_pkt_info_len);
+		break;
+
+	case REMOTE_NDIS_INITIALIZE_CMPLT:
+		netdev_dbg(netdev, "REMOTE_NDIS_INITIALIZE_CMPLT "
+			"(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
+			"device flags %d, max xfer size 0x%x, max pkts %u, "
+			"pkt aligned %u)\n",
+			rndis_msg->msg_len,
+			rndis_msg->msg.init_complete.req_id,
+			rndis_msg->msg.init_complete.status,
+			rndis_msg->msg.init_complete.major_ver,
+			rndis_msg->msg.init_complete.minor_ver,
+			rndis_msg->msg.init_complete.dev_flags,
+			rndis_msg->msg.init_complete.max_xfer_size,
+			rndis_msg->msg.init_complete.
+			   max_pkt_per_msg,
+			rndis_msg->msg.init_complete.
+			   pkt_alignment_factor);
+		break;
+
+	case REMOTE_NDIS_QUERY_CMPLT:
+		netdev_dbg(netdev, "REMOTE_NDIS_QUERY_CMPLT "
+			"(len %u, id 0x%x, status 0x%x, buf len %u, "
+			"buf offset %u)\n",
+			rndis_msg->msg_len,
+			rndis_msg->msg.query_complete.req_id,
+			rndis_msg->msg.query_complete.status,
+			rndis_msg->msg.query_complete.
+			   info_buflen,
+			rndis_msg->msg.query_complete.
+			   info_buf_offset);
+		break;
+
+	case REMOTE_NDIS_SET_CMPLT:
+		netdev_dbg(netdev,
+			"REMOTE_NDIS_SET_CMPLT (len %u, id 0x%x, status 0x%x)\n",
+			rndis_msg->msg_len,
+			rndis_msg->msg.set_complete.req_id,
+			rndis_msg->msg.set_complete.status);
+		break;
+
+	case REMOTE_NDIS_INDICATE_STATUS_MSG:
+		netdev_dbg(netdev, "REMOTE_NDIS_INDICATE_STATUS_MSG "
+			"(len %u, status 0x%x, buf len %u, buf offset %u)\n",
+			rndis_msg->msg_len,
+			rndis_msg->msg.indicate_status.status,
+			rndis_msg->msg.indicate_status.status_buflen,
+			rndis_msg->msg.indicate_status.status_buf_offset);
+		break;
+
+	default:
+		netdev_dbg(netdev, "0x%x (len %u)\n",
+			rndis_msg->ndis_msg_type,
+			rndis_msg->msg_len);
+		break;
+	}
+}
+
+static int rndis_filter_send_request(struct rndis_device *dev,
+				  struct rndis_request *req)
+{
+	int ret;
+	struct hv_netvsc_packet *packet;
+
+	/* Setup the packet to send it */
+	packet = &req->pkt;
+
+	packet->is_data_pkt = false;
+	packet->total_data_buflen = req->request_msg.msg_len;
+	packet->page_buf_cnt = 1;
+
+	packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
+					PAGE_SHIFT;
+	packet->page_buf[0].len = req->request_msg.msg_len;
+	packet->page_buf[0].offset =
+		(unsigned long)&req->request_msg & (PAGE_SIZE - 1);
+
+	packet->completion.send.send_completion_ctx = req;/* packet; */
+	packet->completion.send.send_completion =
+		rndis_filter_send_request_completion;
+	packet->completion.send.send_completion_tid = (unsigned long)dev;
+
+	ret = netvsc_send(dev->net_dev->dev, packet);
+	return ret;
+}
+
+static void rndis_filter_receive_response(struct rndis_device *dev,
+				       struct rndis_message *resp)
+{
+	struct rndis_request *request = NULL;
+	bool found = false;
+	unsigned long flags;
+	struct net_device *ndev;
+
+	ndev = dev->net_dev->ndev;
+
+	spin_lock_irqsave(&dev->request_lock, flags);
+	list_for_each_entry(request, &dev->req_list, list_ent) {
+		/*
+		 * All request/response message contains RequestId as the 1st
+		 * field
+		 */
+		if (request->request_msg.msg.init_req.req_id
+		    == resp->msg.init_complete.req_id) {
+			found = true;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&dev->request_lock, flags);
+
+	if (found) {
+		if (resp->msg_len <= sizeof(struct rndis_message)) {
+			memcpy(&request->response_msg, resp,
+			       resp->msg_len);
+		} else {
+			netdev_err(ndev,
+				"rndis response buffer overflow "
+				"detected (size %u max %zu)\n",
+				resp->msg_len,
+				sizeof(struct rndis_filter_packet));
+
+			if (resp->ndis_msg_type ==
+			    REMOTE_NDIS_RESET_CMPLT) {
+				/* does not have a request id field */
+				request->response_msg.msg.reset_complete.
+					status = STATUS_BUFFER_OVERFLOW;
+			} else {
+				request->response_msg.msg.
+				init_complete.status =
+					STATUS_BUFFER_OVERFLOW;
+			}
+		}
+
+		complete(&request->wait_event);
+	} else {
+		netdev_err(ndev,
+			"no rndis request found for this response "
+			"(id 0x%x res type 0x%x)\n",
+			resp->msg.init_complete.req_id,
+			resp->ndis_msg_type);
+	}
+}
+
+static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
+					     struct rndis_message *resp)
+{
+	struct rndis_indicate_status *indicate =
+			&resp->msg.indicate_status;
+
+	if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
+		netvsc_linkstatus_callback(
+			dev->net_dev->dev, 1);
+	} else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
+		netvsc_linkstatus_callback(
+			dev->net_dev->dev, 0);
+	} else {
+		/*
+		 * TODO:
+		 */
+	}
+}
+
+static void rndis_filter_receive_data(struct rndis_device *dev,
+				   struct rndis_message *msg,
+				   struct hv_netvsc_packet *pkt)
+{
+	struct rndis_packet *rndis_pkt;
+	u32 data_offset;
+	int i;
+
+	rndis_pkt = &msg->msg.pkt;
+
+	/*
+	 * FIXME: Handle multiple rndis pkt msgs that maybe enclosed in this
+	 * netvsc packet (ie TotalDataBufferLength != MessageLength)
+	 */
+
+	/* Remove the rndis header and pass it back up the stack */
+	data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
+
+	pkt->total_data_buflen -= data_offset;
+	pkt->page_buf[0].offset += data_offset;
+	pkt->page_buf[0].len -= data_offset;
+
+	/* Drop the 0th page, if rndis data go beyond page boundary */
+	if (pkt->page_buf[0].offset >= PAGE_SIZE) {
+		pkt->page_buf[1].offset = pkt->page_buf[0].offset - PAGE_SIZE;
+		pkt->page_buf[1].len -= pkt->page_buf[1].offset;
+		pkt->page_buf_cnt--;
+		for (i = 0; i < pkt->page_buf_cnt; i++)
+			pkt->page_buf[i] = pkt->page_buf[i+1];
+	}
+
+	pkt->is_data_pkt = true;
+
+	netvsc_recv_callback(dev->net_dev->dev, pkt);
+}
+
+int rndis_filter_receive(struct hv_device *dev,
+				struct hv_netvsc_packet	*pkt)
+{
+	struct netvsc_device *net_dev = hv_get_drvdata(dev);
+	struct rndis_device *rndis_dev;
+	struct rndis_message rndis_msg;
+	struct rndis_message *rndis_hdr;
+	struct net_device *ndev;
+
+	if (!net_dev)
+		return -EINVAL;
+
+	ndev = net_dev->ndev;
+
+	/* Make sure the rndis device state is initialized */
+	if (!net_dev->extension) {
+		netdev_err(ndev, "got rndis message but no rndis device - "
+			  "dropping this message!\n");
+		return -ENODEV;
+	}
+
+	rndis_dev = (struct rndis_device *)net_dev->extension;
+	if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
+		netdev_err(ndev, "got rndis message but rndis device "
+			   "uninitialized...dropping this message!\n");
+		return -ENODEV;
+	}
+
+	rndis_hdr = (struct rndis_message *)kmap_atomic(
+			pfn_to_page(pkt->page_buf[0].pfn), KM_IRQ0);
+
+	rndis_hdr = (void *)((unsigned long)rndis_hdr +
+			pkt->page_buf[0].offset);
+
+	/* Make sure we got a valid rndis message */
+	if ((rndis_hdr->ndis_msg_type != REMOTE_NDIS_PACKET_MSG) &&
+	    (rndis_hdr->msg_len > sizeof(struct rndis_message))) {
+		netdev_err(ndev, "incoming rndis message buffer overflow "
+			   "detected (got %u, max %zu)..marking it an error!\n",
+			   rndis_hdr->msg_len,
+			   sizeof(struct rndis_message));
+	}
+
+	memcpy(&rndis_msg, rndis_hdr,
+		(rndis_hdr->msg_len > sizeof(struct rndis_message)) ?
+			sizeof(struct rndis_message) :
+			rndis_hdr->msg_len);
+
+	kunmap_atomic(rndis_hdr - pkt->page_buf[0].offset, KM_IRQ0);
+
+	dump_rndis_message(dev, &rndis_msg);
+
+	switch (rndis_msg.ndis_msg_type) {
+	case REMOTE_NDIS_PACKET_MSG:
+		/* data msg */
+		rndis_filter_receive_data(rndis_dev, &rndis_msg, pkt);
+		break;
+
+	case REMOTE_NDIS_INITIALIZE_CMPLT:
+	case REMOTE_NDIS_QUERY_CMPLT:
+	case REMOTE_NDIS_SET_CMPLT:
+		/* completion msgs */
+		rndis_filter_receive_response(rndis_dev, &rndis_msg);
+		break;
+
+	case REMOTE_NDIS_INDICATE_STATUS_MSG:
+		/* notification msgs */
+		rndis_filter_receive_indicate_status(rndis_dev, &rndis_msg);
+		break;
+	default:
+		netdev_err(ndev,
+			"unhandled rndis message (type %u len %u)\n",
+			   rndis_msg.ndis_msg_type,
+			   rndis_msg.msg_len);
+		break;
+	}
+
+	return 0;
+}
+
+static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
+				  void *result, u32 *result_size)
+{
+	struct rndis_request *request;
+	u32 inresult_size = *result_size;
+	struct rndis_query_request *query;
+	struct rndis_query_complete *query_complete;
+	int ret = 0;
+	int t;
+
+	if (!result)
+		return -EINVAL;
+
+	*result_size = 0;
+	request = get_rndis_request(dev, REMOTE_NDIS_QUERY_MSG,
+			RNDIS_MESSAGE_SIZE(struct rndis_query_request));
+	if (!request) {
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	/* Setup the rndis query */
+	query = &request->request_msg.msg.query_req;
+	query->oid = oid;
+	query->info_buf_offset = sizeof(struct rndis_query_request);
+	query->info_buflen = 0;
+	query->dev_vc_handle = 0;
+
+	ret = rndis_filter_send_request(dev, request);
+	if (ret != 0)
+		goto cleanup;
+
+	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+	if (t == 0) {
+		ret = -ETIMEDOUT;
+		goto cleanup;
+	}
+
+	/* Copy the response back */
+	query_complete = &request->response_msg.msg.query_complete;
+
+	if (query_complete->info_buflen > inresult_size) {
+		ret = -1;
+		goto cleanup;
+	}
+
+	memcpy(result,
+	       (void *)((unsigned long)query_complete +
+			 query_complete->info_buf_offset),
+	       query_complete->info_buflen);
+
+	*result_size = query_complete->info_buflen;
+
+cleanup:
+	if (request)
+		put_rndis_request(dev, request);
+
+	return ret;
+}
+
+static int rndis_filter_query_device_mac(struct rndis_device *dev)
+{
+	u32 size = ETH_ALEN;
+
+	return rndis_filter_query_device(dev,
+				      RNDIS_OID_802_3_PERMANENT_ADDRESS,
+				      dev->hw_mac_adr, &size);
+}
+
+static int rndis_filter_query_device_link_status(struct rndis_device *dev)
+{
+	u32 size = sizeof(u32);
+	u32 link_status;
+	int ret;
+
+	ret = rndis_filter_query_device(dev,
+				      RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
+				      &link_status, &size);
+	dev->link_state = (link_status != 0) ? true : false;
+
+	return ret;
+}
+
+static int rndis_filter_set_packet_filter(struct rndis_device *dev,
+				      u32 new_filter)
+{
+	struct rndis_request *request;
+	struct rndis_set_request *set;
+	struct rndis_set_complete *set_complete;
+	u32 status;
+	int ret, t;
+	struct net_device *ndev;
+
+	ndev = dev->net_dev->ndev;
+
+	request = get_rndis_request(dev, REMOTE_NDIS_SET_MSG,
+			RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
+			sizeof(u32));
+	if (!request) {
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	/* Setup the rndis set */
+	set = &request->request_msg.msg.set_req;
+	set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
+	set->info_buflen = sizeof(u32);
+	set->info_buf_offset = sizeof(struct rndis_set_request);
+
+	memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
+	       &new_filter, sizeof(u32));
+
+	ret = rndis_filter_send_request(dev, request);
+	if (ret != 0)
+		goto cleanup;
+
+	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+
+	if (t == 0) {
+		netdev_err(ndev,
+			"timeout before we got a set response...\n");
+		/*
+		 * We can't deallocate the request since we may still receive a
+		 * send completion for it.
+		 */
+		goto exit;
+	} else {
+		set_complete = &request->response_msg.msg.set_complete;
+		status = set_complete->status;
+	}
+
+cleanup:
+	if (request)
+		put_rndis_request(dev, request);
+exit:
+	return ret;
+}
+
+
+static int rndis_filter_init_device(struct rndis_device *dev)
+{
+	struct rndis_request *request;
+	struct rndis_initialize_request *init;
+	struct rndis_initialize_complete *init_complete;
+	u32 status;
+	int ret, t;
+
+	request = get_rndis_request(dev, REMOTE_NDIS_INITIALIZE_MSG,
+			RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
+	if (!request) {
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	/* Setup the rndis set */
+	init = &request->request_msg.msg.init_req;
+	init->major_ver = RNDIS_MAJOR_VERSION;
+	init->minor_ver = RNDIS_MINOR_VERSION;
+	/* FIXME: Use 1536 - rounded ethernet frame size */
+	init->max_xfer_size = 2048;
+
+	dev->state = RNDIS_DEV_INITIALIZING;
+
+	ret = rndis_filter_send_request(dev, request);
+	if (ret != 0) {
+		dev->state = RNDIS_DEV_UNINITIALIZED;
+		goto cleanup;
+	}
+
+
+	t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+
+	if (t == 0) {
+		ret = -ETIMEDOUT;
+		goto cleanup;
+	}
+
+	init_complete = &request->response_msg.msg.init_complete;
+	status = init_complete->status;
+	if (status == RNDIS_STATUS_SUCCESS) {
+		dev->state = RNDIS_DEV_INITIALIZED;
+		ret = 0;
+	} else {
+		dev->state = RNDIS_DEV_UNINITIALIZED;
+		ret = -EINVAL;
+	}
+
+cleanup:
+	if (request)
+		put_rndis_request(dev, request);
+
+	return ret;
+}
+
+static void rndis_filter_halt_device(struct rndis_device *dev)
+{
+	struct rndis_request *request;
+	struct rndis_halt_request *halt;
+
+	/* Attempt to do a rndis device halt */
+	request = get_rndis_request(dev, REMOTE_NDIS_HALT_MSG,
+				RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
+	if (!request)
+		goto cleanup;
+
+	/* Setup the rndis set */
+	halt = &request->request_msg.msg.halt_req;
+	halt->req_id = atomic_inc_return(&dev->new_req_id);
+
+	/* Ignore return since this msg is optional. */
+	rndis_filter_send_request(dev, request);
+
+	dev->state = RNDIS_DEV_UNINITIALIZED;
+
+cleanup:
+	if (request)
+		put_rndis_request(dev, request);
+	return;
+}
+
+static int rndis_filter_open_device(struct rndis_device *dev)
+{
+	int ret;
+
+	if (dev->state != RNDIS_DEV_INITIALIZED)
+		return 0;
+
+	ret = rndis_filter_set_packet_filter(dev,
+					 NDIS_PACKET_TYPE_BROADCAST |
+					 NDIS_PACKET_TYPE_ALL_MULTICAST |
+					 NDIS_PACKET_TYPE_DIRECTED);
+	if (ret == 0)
+		dev->state = RNDIS_DEV_DATAINITIALIZED;
+
+	return ret;
+}
+
+static int rndis_filter_close_device(struct rndis_device *dev)
+{
+	int ret;
+
+	if (dev->state != RNDIS_DEV_DATAINITIALIZED)
+		return 0;
+
+	ret = rndis_filter_set_packet_filter(dev, 0);
+	if (ret == 0)
+		dev->state = RNDIS_DEV_INITIALIZED;
+
+	return ret;
+}
+
+int rndis_filter_device_add(struct hv_device *dev,
+				  void *additional_info)
+{
+	int ret;
+	struct netvsc_device *net_device;
+	struct rndis_device *rndis_device;
+	struct netvsc_device_info *device_info = additional_info;
+
+	rndis_device = get_rndis_device();
+	if (!rndis_device)
+		return -ENODEV;
+
+	/*
+	 * Let the inner driver handle this first to create the netvsc channel
+	 * NOTE! Once the channel is created, we may get a receive callback
+	 * (RndisFilterOnReceive()) before this call is completed
+	 */
+	ret = netvsc_device_add(dev, additional_info);
+	if (ret != 0) {
+		kfree(rndis_device);
+		return ret;
+	}
+
+
+	/* Initialize the rndis device */
+	net_device = hv_get_drvdata(dev);
+
+	net_device->extension = rndis_device;
+	rndis_device->net_dev = net_device;
+
+	/* Send the rndis initialization message */
+	ret = rndis_filter_init_device(rndis_device);
+	if (ret != 0) {
+		/*
+		 * TODO: If rndis init failed, we will need to shut down the
+		 * channel
+		 */
+	}
+
+	/* Get the mac address */
+	ret = rndis_filter_query_device_mac(rndis_device);
+	if (ret != 0) {
+		/*
+		 * TODO: shutdown rndis device and the channel
+		 */
+	}
+
+	memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
+
+	rndis_filter_query_device_link_status(rndis_device);
+
+	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");
+
+	return ret;
+}
+
+void rndis_filter_device_remove(struct hv_device *dev)
+{
+	struct netvsc_device *net_dev = hv_get_drvdata(dev);
+	struct rndis_device *rndis_dev = net_dev->extension;
+
+	/* Halt and release the rndis device */
+	rndis_filter_halt_device(rndis_dev);
+
+	kfree(rndis_dev);
+	net_dev->extension = NULL;
+
+	netvsc_device_remove(dev);
+}
+
+
+int rndis_filter_open(struct hv_device *dev)
+{
+	struct netvsc_device *net_device = hv_get_drvdata(dev);
+
+	if (!net_device)
+		return -EINVAL;
+
+	return rndis_filter_open_device(net_device->extension);
+}
+
+int rndis_filter_close(struct hv_device *dev)
+{
+	struct netvsc_device *netDevice = hv_get_drvdata(dev);
+
+	if (!netDevice)
+		return -EINVAL;
+
+	return rndis_filter_close_device(netDevice->extension);
+}
+
+int rndis_filter_send(struct hv_device *dev,
+			     struct hv_netvsc_packet *pkt)
+{
+	int ret;
+	struct rndis_filter_packet *filterPacket;
+	struct rndis_message *rndisMessage;
+	struct rndis_packet *rndisPacket;
+	u32 rndisMessageSize;
+
+	/* Add the rndis header */
+	filterPacket = (struct rndis_filter_packet *)pkt->extension;
+
+	memset(filterPacket, 0, sizeof(struct rndis_filter_packet));
+
+	rndisMessage = &filterPacket->msg;
+	rndisMessageSize = RNDIS_MESSAGE_SIZE(struct rndis_packet);
+
+	rndisMessage->ndis_msg_type = REMOTE_NDIS_PACKET_MSG;
+	rndisMessage->msg_len = pkt->total_data_buflen +
+				      rndisMessageSize;
+
+	rndisPacket = &rndisMessage->msg.pkt;
+	rndisPacket->data_offset = sizeof(struct rndis_packet);
+	rndisPacket->data_len = pkt->total_data_buflen;
+
+	pkt->is_data_pkt = true;
+	pkt->page_buf[0].pfn = virt_to_phys(rndisMessage) >> PAGE_SHIFT;
+	pkt->page_buf[0].offset =
+			(unsigned long)rndisMessage & (PAGE_SIZE-1);
+	pkt->page_buf[0].len = rndisMessageSize;
+
+	/* Save the packet send completion and context */
+	filterPacket->completion = pkt->completion.send.send_completion;
+	filterPacket->completion_ctx =
+				pkt->completion.send.send_completion_ctx;
+
+	/* Use ours */
+	pkt->completion.send.send_completion = rndis_filter_send_completion;
+	pkt->completion.send.send_completion_ctx = filterPacket;
+
+	ret = netvsc_send(dev, pkt);
+	if (ret != 0) {
+		/*
+		 * Reset the completion to originals to allow retries from
+		 * above
+		 */
+		pkt->completion.send.send_completion =
+				filterPacket->completion;
+		pkt->completion.send.send_completion_ctx =
+				filterPacket->completion_ctx;
+	}
+
+	return ret;
+}
+
+static void rndis_filter_send_completion(void *ctx)
+{
+	struct rndis_filter_packet *filterPacket = ctx;
+
+	/* Pass it back to the original handler */
+	filterPacket->completion(filterPacket->completion_ctx);
+}
+
+
+static void rndis_filter_send_request_completion(void *ctx)
+{
+	/* Noop */
+}