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, 456 insertions, 0 deletions

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
new file mode 100644
index 000000000000..93b0e91cbf98
--- /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);