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>

1 files changed, 855 insertions, 0 deletions

diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
new file mode 100644
index 00000000000..bafccb36004
--- /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 */
+}