Merge branch 'ldmvsw'

Aaron Young says:

====================
ldmvsw: Add ldmvsw driver

This series adds a new Logical Domains vSwitch (ldmvsw) driver.

The ldmvsw driver code will live in the drivers/net/ethernet/sun/
directory and will operate on Oracle systems running SPARC Linux in a
Logical Domains environment (typically in the control domain).

The ldmvsw driver is very similar in function to the existing sunvnet
driver. Ldmvsw creates a network interface for each "vsw-port" node
found in the Machine Description (MD) of a service domain. These
nodes correspond to ports on a vswitch created by the logical domains
manager. The created network interface(s) can be used by bridge/vswitch
software (such as the Linux bridge or Open vSwitch) to provide
guest domain(s) with network interconnectivity or connectivity
to a physical network.

Here is a example diagram of ldmvsw driver usage in a logical
domain environment to provide a guest domain with network connectivity
to a physical NIC on the service domain:

   +----------------+             +-----------------
   | Service Domain |             |  Guest domain  |
   |                |             |                |
   |  LinuxBridge   |             |                |
   |    |    |      |             |                |
   |   NIC Ldmvsw   |             |    Sunvnet     |
   +----------------+             +----------------+
        |    |           LDC              |
       LAN   ------------------------------

As stated, the sunvnet and ldmvsw drivers are _very_ similar in function.
They both create network interface(s) to receive/transmit network
traffic across LDC network channel(s). Since the driver is so similar
in function to sunvnet, the approach will be as follows to integrate
the driver and take advantage of common code:

Patch #1: Split sunvnet.c driver into sunvnet.c and sunvnet_common.c
Patch #2: Modify the sunvnet_common code and data structures to be compatible
          with both the sunvnet and ldmvsw drivers.
Patch #3: Add the new ldmvsw.c driver code
Patch #4: Checkpatch cleanup of the sunvnet/sunvnet_common code.

NOTE - Patch#1 renames a file (sunvnet.h -> sunvnet_common.h). When generating
the patches (using git format-patch), I had to use the --no-renames option
otherwise patch#1 would NOT apply using 'patch -p1' - which as I
understand is a requirement for patch acceptance. I wasn't sure if this
is proper thing to do.  Please advise if not. Thanks.

v2 changes:
  * change all EXPORT_SYMBOL declarations to EXPORT_SYMBOL_GPL
  * remove inline attribute for external function port_is_up_common()
  * Give all exported/global funcs in sunvnet_common.c a 'sunvnet_' prefix
    to avoid kernel global namespace pollution/collisions
  * ldmvsw.c: Order local variable declarations from longest to shortest line
  * ldmvsw.c: register the netdevice after all supporting state is ready/setup.
              NOTE: The consensus at Oracle is that the following functions
                    must be done AFTER register_netdev() - this is the same
                    ordering currently used in the sunvnet driver:
                    1. sunvnet_port_add_txq_common() - needs registered netdev
                    2. napi_enable() - requires registered netdev
                    3. vio_port_up() - as soon as this function is called
                                       LDC handshake messages will come in
                                       which must be handled by the napi code.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/configs/sparc64_defconfig

@@ -102,6 +102,7 @@ CONFIG_SUNLANCE=m
 CONFIG_HAPPYMEAL=m
 CONFIG_SUNGEM=m
 CONFIG_SUNVNET=m
+CONFIG_LDMVSW=m
 CONFIG_NET_PCI=y
 CONFIG_E1000=m
 CONFIG_E1000E=m

drivers/net/ethernet/sun/Kconfig

@@ -69,12 +69,28 @@ config CASSINI
 	  Support for the Sun Cassini chip, aka Sun GigaSwift Ethernet. See also
 	  <http://docs.oracle.com/cd/E19113-01/giga.ether.pci/817-4341-10/817-4341-10.pdf>.
 
+config SUNVNET_COMMON
+	bool
+	depends on SUN_LDOMS
+	default y if SUN_LDOMS
+
 config SUNVNET
 	tristate "Sun Virtual Network support"
 	depends on SUN_LDOMS
 	---help---
 	  Support for virtual network devices under Sun Logical Domains.
 
+config LDMVSW
+	tristate "Sun4v LDoms Virtual Switch support"
+	depends on SUN_LDOMS
+	---help---
+	  Support for virtual switch devices under Sun4v Logical Domains.
+	  This driver adds a network interface for every vsw-port node
+	  found in the machine description of a service domain.
+	  Linux bridge/switch software can use these interfaces for
+	  guest domain network interconnectivity or guest domain
+	  connection to a physical network on a service domain.
+
 config NIU
 	tristate "Sun Neptune 10Gbit Ethernet support"
 	depends on PCI

drivers/net/ethernet/sun/Makefile

@@ -7,5 +7,7 @@ obj-$(CONFIG_SUNQE) += sunqe.o
 obj-$(CONFIG_SUNBMAC) += sunbmac.o
 obj-$(CONFIG_SUNGEM) += sungem.o
 obj-$(CONFIG_CASSINI) += cassini.o
+obj-$(CONFIG_SUNVNET_COMMON) += sunvnet_common.o
 obj-$(CONFIG_SUNVNET) += sunvnet.o
+obj-$(CONFIG_LDMVSW) += ldmvsw.o
 obj-$(CONFIG_NIU) += niu.o

drivers/net/ethernet/sun/ldmvsw.c

+/* ldmvsw.c: Sun4v LDOM Virtual Switch Driver.
+ *
+ * Copyright (C) 2016 Oracle. All rights reserved.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/delay.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/highmem.h>
+#include <linux/if_vlan.h>
+#include <linux/init.h>
+#include <linux/kconfig.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#if defined(CONFIG_IPV6)
+#include <linux/icmpv6.h>
+#endif
+
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/route.h>
+
+#include <asm/vio.h>
+#include <asm/ldc.h>
+
+/* This driver makes use of the common code in sunvnet_common.c */
+#include "sunvnet_common.h"
+
+/* Length of time before we decide the hardware is hung,
+ * and dev->tx_timeout() should be called to fix the problem.
+ */
+#define VSW_TX_TIMEOUT			(10 * HZ)
+
+/* Static HW Addr used for the network interfaces representing vsw ports */
+static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+#define DRV_MODULE_NAME		"ldmvsw"
+#define DRV_MODULE_VERSION	"1.0"
+#define DRV_MODULE_RELDATE	"Jan 15, 2016"
+
+static char version[] =
+	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+MODULE_AUTHOR("Oracle");
+MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_MODULE_VERSION);
+
+/* Ordered from largest major to lowest */
+static struct vio_version vsw_versions[] = {
+	{ .major = 1, .minor = 8 },
+	{ .major = 1, .minor = 7 },
+	{ .major = 1, .minor = 6 },
+	{ .major = 1, .minor = 0 },
+};
+
+static void vsw_get_drvinfo(struct net_device *dev,
+			    struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
+}
+
+static u32 vsw_get_msglevel(struct net_device *dev)
+{
+	struct vnet_port *port = netdev_priv(dev);
+
+	return port->vp->msg_enable;
+}
+
+static void vsw_set_msglevel(struct net_device *dev, u32 value)
+{
+	struct vnet_port *port = netdev_priv(dev);
+
+	port->vp->msg_enable = value;
+}
+
+static const struct ethtool_ops vsw_ethtool_ops = {
+	.get_drvinfo		= vsw_get_drvinfo,
+	.get_msglevel		= vsw_get_msglevel,
+	.set_msglevel		= vsw_set_msglevel,
+	.get_link		= ethtool_op_get_link,
+};
+
+static LIST_HEAD(vnet_list);
+static DEFINE_MUTEX(vnet_list_mutex);
+
+/* func arg to vnet_start_xmit_common() to get the proper tx port */
+static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb,
+					  struct net_device *dev)
+{
+	struct vnet_port *port = netdev_priv(dev);
+
+	return port;
+}
+
+static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb,
+			    void *accel_priv, select_queue_fallback_t fallback)
+{
+	struct vnet_port *port = netdev_priv(dev);
+
+	if (!port)
+		return 0;
+
+	return port->q_index;
+}
+
+/* Wrappers to common functions */
+static int vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
+}
+
+static void vsw_set_rx_mode(struct net_device *dev)
+{
+	struct vnet_port *port = netdev_priv(dev);
+
+	return sunvnet_set_rx_mode_common(dev, port->vp);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void vsw_poll_controller(struct net_device *dev)
+{
+	struct vnet_port *port = netdev_priv(dev);
+
+	return sunvnet_poll_controller_common(dev, port->vp);
+}
+#endif
+
+static const struct net_device_ops vsw_ops = {
+	.ndo_open		= sunvnet_open_common,
+	.ndo_stop		= sunvnet_close_common,
+	.ndo_set_rx_mode	= vsw_set_rx_mode,
+	.ndo_set_mac_address	= sunvnet_set_mac_addr_common,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_tx_timeout		= sunvnet_tx_timeout_common,
+	.ndo_change_mtu		= sunvnet_change_mtu_common,
+	.ndo_start_xmit		= vsw_start_xmit,
+	.ndo_select_queue	= vsw_select_queue,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller    = vsw_poll_controller,
+#endif
+};
+
+static const char *local_mac_prop = "local-mac-address";
+static const char *cfg_handle_prop = "cfg-handle";
+
+static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
+				 u64 port_node,
+				 u64 *handle)
+{
+	struct vnet *vp;
+	struct vnet *iter;
+	const u64 *local_mac = NULL;
+	const u64 *cfghandle = NULL;
+	u64 a;
+
+	/* Get the parent virtual-network-switch macaddr and cfghandle */
+	mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
+		u64 target = mdesc_arc_target(hp, a);
+		const char *name;
+
+		name = mdesc_get_property(hp, target, "name", NULL);
+		if (!name || strcmp(name, "virtual-network-switch"))
+			continue;
+
+		local_mac = mdesc_get_property(hp, target,
+					       local_mac_prop, NULL);
+		cfghandle = mdesc_get_property(hp, target,
+					       cfg_handle_prop, NULL);
+		break;
+	}
+	if (!local_mac || !cfghandle)
+		return ERR_PTR(-ENODEV);
+
+	/* find or create associated vnet */
+	vp = NULL;
+	mutex_lock(&vnet_list_mutex);
+	list_for_each_entry(iter, &vnet_list, list) {
+		if (iter->local_mac == *local_mac) {
+			vp = iter;
+			break;
+		}
+	}
+
+	if (!vp) {
+		vp = kzalloc(sizeof(*vp), GFP_KERNEL);
+		if (unlikely(!vp)) {
+			mutex_unlock(&vnet_list_mutex);
+			return ERR_PTR(-ENOMEM);
+		}
+
+		spin_lock_init(&vp->lock);
+		INIT_LIST_HEAD(&vp->port_list);
+		INIT_LIST_HEAD(&vp->list);
+		vp->local_mac = *local_mac;
+		list_add(&vp->list, &vnet_list);
+	}
+
+	mutex_unlock(&vnet_list_mutex);
+
+	*handle = (u64)*cfghandle;
+
+	return vp;
+}
+
+static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
+					   struct vio_dev *vdev,
+					   u64 handle,
+					   u64 port_id)
+{
+	struct net_device *dev;
+	struct vnet_port *port;
+	int i;
+
+	dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+	dev->needed_headroom = VNET_PACKET_SKIP + 8;
+	dev->needed_tailroom = 8;
+
+	for (i = 0; i < ETH_ALEN; i++) {
+		dev->dev_addr[i] = hwaddr[i];
+		dev->perm_addr[i] = dev->dev_addr[i];
+	}
+
+	sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
+
+	dev->netdev_ops = &vsw_ops;
+	dev->ethtool_ops = &vsw_ethtool_ops;
+	dev->watchdog_timeo = VSW_TX_TIMEOUT;
+
+	dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
+			   NETIF_F_HW_CSUM | NETIF_F_SG;
+	dev->features = dev->hw_features;
+
+	SET_NETDEV_DEV(dev, &vdev->dev);
+
+	return dev;
+}
+
+static struct ldc_channel_config vsw_ldc_cfg = {
+	.event		= sunvnet_event_common,
+	.mtu		= 64,
+	.mode		= LDC_MODE_UNRELIABLE,
+};
+
+static struct vio_driver_ops vsw_vio_ops = {
+	.send_attr		= sunvnet_send_attr_common,
+	.handle_attr		= sunvnet_handle_attr_common,
+	.handshake_complete	= sunvnet_handshake_complete_common,
+};
+
+static void print_version(void)
+{
+	printk_once(KERN_INFO "%s", version);
+}
+
+static const char *remote_macaddr_prop = "remote-mac-address";
+static const char *id_prop = "id";
+
+static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
+{
+	struct mdesc_handle *hp;
+	struct vnet_port *port;
+	unsigned long flags;
+	struct vnet *vp;
+	struct net_device *dev;
+	const u64 *rmac;
+	int len, i, err;
+	const u64 *port_id;
+	u64 handle;
+
+	print_version();
+
+	hp = mdesc_grab();
+
+	rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
+	err = -ENODEV;
+	if (!rmac) {
+		pr_err("Port lacks %s property\n", remote_macaddr_prop);
+		mdesc_release(hp);
+		return err;
+	}
+
+	port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
+	err = -ENODEV;
+	if (!port_id) {
+		pr_err("Port lacks %s property\n", id_prop);
+		mdesc_release(hp);
+		return err;
+	}
+
+	/* Get (or create) the vnet associated with this port */
+	vp = vsw_get_vnet(hp, vdev->mp, &handle);
+	if (unlikely(IS_ERR(vp))) {
+		err = PTR_ERR(vp);
+		pr_err("Failed to get vnet for vsw-port\n");
+		mdesc_release(hp);
+		return err;
+	}
+
+	mdesc_release(hp);
+
+	dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
+	if (IS_ERR(dev)) {
+		err = PTR_ERR(dev);
+		pr_err("Failed to alloc netdev for vsw-port\n");
+		return err;
+	}
+
+	port = netdev_priv(dev);
+
+	INIT_LIST_HEAD(&port->list);
+
+	for (i = 0; i < ETH_ALEN; i++)
+		port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
+
+	port->vp = vp;
+	port->dev = dev;
+	port->switch_port = 1;
+	port->tso = true;
+	port->tsolen = 0;
+
+	/* Mark the port as belonging to ldmvsw which directs the
+	 * the common code to use the net_device in the vnet_port
+	 * rather than the net_device in the vnet (which is used
+	 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
+	 * macro.
+	 */
+	port->vsw = 1;
+
+	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
+			      vsw_versions, ARRAY_SIZE(vsw_versions),
+			      &vsw_vio_ops, dev->name);
+	if (err)
+		goto err_out_free_dev;
+
+	err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
+	if (err)
+		goto err_out_free_dev;
+
+	dev_set_drvdata(&vdev->dev, port);
+
+	netif_napi_add(dev, &port->napi, sunvnet_poll_common,
+		       NAPI_POLL_WEIGHT);
+
+	spin_lock_irqsave(&vp->lock, flags);
+	list_add_rcu(&port->list, &vp->port_list);
+	spin_unlock_irqrestore(&vp->lock, flags);
+
+	setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
+		    (unsigned long)port);
+
+	err = register_netdev(dev);
+	if (err) {
+		pr_err("Cannot register net device, aborting\n");
+		goto err_out_del_timer;
+	}
+
+	spin_lock_irqsave(&vp->lock, flags);
+	sunvnet_port_add_txq_common(port);
+	spin_unlock_irqrestore(&vp->lock, flags);
+
+	napi_enable(&port->napi);
+	vio_port_up(&port->vio);
+
+	netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
+
+	pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
+		port->raddr, " switch-port");
+
+	return 0;
+
+err_out_del_timer:
+	del_timer_sync(&port->clean_timer);
+	list_del_rcu(&port->list);
+	synchronize_rcu();
+	netif_napi_del(&port->napi);
+	dev_set_drvdata(&vdev->dev, NULL);
+	vio_ldc_free(&port->vio);
+
+err_out_free_dev:
+	free_netdev(dev);
+	return err;
+}
+
+static int vsw_port_remove(struct vio_dev *vdev)
+{
+	struct vnet_port *port = dev_get_drvdata(&vdev->dev);
+	unsigned long flags;
+
+	if (port) {
+		del_timer_sync(&port->vio.timer);
+
+		napi_disable(&port->napi);
+
+		list_del_rcu(&port->list);
+
+		synchronize_rcu();
+		del_timer_sync(&port->clean_timer);
+		spin_lock_irqsave(&port->vp->lock, flags);
+		sunvnet_port_rm_txq_common(port);
+		spin_unlock_irqrestore(&port->vp->lock, flags);
+		netif_napi_del(&port->napi);
+		sunvnet_port_free_tx_bufs_common(port);
+		vio_ldc_free(&port->vio);
+
+		dev_set_drvdata(&vdev->dev, NULL);
+
+		unregister_netdev(port->dev);
+		free_netdev(port->dev);
+	}
+
+	return 0;
+}
+
+static void vsw_cleanup(void)
+{
+	struct vnet *vp;
+
+	/* just need to free up the vnet list */
+	mutex_lock(&vnet_list_mutex);
+	while (!list_empty(&vnet_list)) {
+		vp = list_first_entry(&vnet_list, struct vnet, list);
+		list_del(&vp->list);
+		/* vio_unregister_driver() should have cleaned up port_list */
+		if (!list_empty(&vp->port_list))
+			pr_err("Ports not removed by VIO subsystem!\n");
+		kfree(vp);
+	}
+	mutex_unlock(&vnet_list_mutex);
+}
+
+static const struct vio_device_id vsw_port_match[] = {
+	{
+		.type = "vsw-port",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(vio, vsw_port_match);
+
+static struct vio_driver vsw_port_driver = {
+	.id_table	= vsw_port_match,
+	.probe		= vsw_port_probe,
+	.remove		= vsw_port_remove,
+	.name		= "vsw_port",
+};
+
+static int __init vsw_init(void)
+{
+	return vio_register_driver(&vsw_port_driver);
+}
+
+static void __exit vsw_exit(void)
+{
+	vio_unregister_driver(&vsw_port_driver);
+	vsw_cleanup();
+}
+
+module_init(vsw_init);
+module_exit(vsw_exit);

drivers/net/ethernet/sun/sunvnet.c

 /* sunvnet.c: Sun LDOM Virtual Network Driver.
  *
  * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
+ * Copyright (C) 2016 Oracle. All rights reserved.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -17,8 +18,6 @@
 #include <linux/mutex.h>
 #include <linux/highmem.h>
 #include <linux/if_vlan.h>
-#define CREATE_TRACE_POINTS
-#include <trace/events/sunvnet.h>
 
 #if IS_ENABLED(CONFIG_IPV6)
 #include <linux/icmpv6.h>
@@ -31,7 +30,12 @@
 #include <asm/vio.h>
 #include <asm/ldc.h>
 
-#include "sunvnet.h"
+#include "sunvnet_common.h"
+
+/* length of time before we decide the hardware is borked,
+ * and dev->tx_timeout() should be called to fix the problem
+ */
+#define VNET_TX_TIMEOUT			(5 * HZ)
 
 #define DRV_MODULE_NAME		"sunvnet"
 #define DRV_MODULE_VERSION	"1.0"
@@ -44,16 +48,6 @@ MODULE_DESCRIPTION("Sun LDOM virtual network driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRV_MODULE_VERSION);
 
-#define	VNET_MAX_TXQS		16
-
-/* Heuristic for the number of times to exponentially backoff and
- * retry sending an LDC trigger when EAGAIN is encountered
- */
-#define	VNET_MAX_RETRIES	10
-
-static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
-static void vnet_port_reset(struct vnet_port *port);
-
 /* Ordered from largest major to lowest */
 static struct vio_version vnet_versions[] = {
 	{ .major = 1, .minor = 8 },
@@ -62,881 +56,45 @@ static struct vio_version vnet_versions[] = {
 	{ .major = 1, .minor = 0 },
 };
 
-static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
-{
-	return vio_dring_avail(dr, VNET_TX_RING_SIZE);
-}
-
-static int vnet_handle_unknown(struct vnet_port *port, void *arg)
-{
-	struct vio_msg_tag *pkt = arg;
-
-	pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
-	       pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
-	pr_err("Resetting connection\n");
-
-	ldc_disconnect(port->vio.lp);
-
-	return -ECONNRESET;
-}
-
-static int vnet_port_alloc_tx_ring(struct vnet_port *port);
-
-static int vnet_send_attr(struct vio_driver_state *vio)
-{
-	struct vnet_port *port = to_vnet_port(vio);
-	struct net_device *dev = port->vp->dev;
-	struct vio_net_attr_info pkt;
-	int framelen = ETH_FRAME_LEN;
-	int i, err;
-
-	err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
-	if (err)
-		return err;
-
-	memset(&pkt, 0, sizeof(pkt));
-	pkt.tag.type = VIO_TYPE_CTRL;
-	pkt.tag.stype = VIO_SUBTYPE_INFO;
-	pkt.tag.stype_env = VIO_ATTR_INFO;
-	pkt.tag.sid = vio_send_sid(vio);
-	if (vio_version_before(vio, 1, 2))
-		pkt.xfer_mode = VIO_DRING_MODE;
-	else
-		pkt.xfer_mode = VIO_NEW_DRING_MODE;
-	pkt.addr_type = VNET_ADDR_ETHERMAC;
-	pkt.ack_freq = 0;
-	for (i = 0; i < 6; i++)
-		pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
-	if (vio_version_after(vio, 1, 3)) {
-		if (port->rmtu) {
-			port->rmtu = min(VNET_MAXPACKET, port->rmtu);
-			pkt.mtu = port->rmtu;
-		} else {
-			port->rmtu = VNET_MAXPACKET;
-			pkt.mtu = port->rmtu;
-		}
-		if (vio_version_after_eq(vio, 1, 6))
-			pkt.options = VIO_TX_DRING;
-	} else if (vio_version_before(vio, 1, 3)) {
-		pkt.mtu = framelen;
-	} else { /* v1.3 */
-		pkt.mtu = framelen + VLAN_HLEN;
-	}
-
-	pkt.cflags = 0;
-	if (vio_version_after_eq(vio, 1, 7) && port->tso) {
-		pkt.cflags |= VNET_LSO_IPV4_CAPAB;
-		if (!port->tsolen)
-			port->tsolen = VNET_MAXTSO;
-		pkt.ipv4_lso_maxlen = port->tsolen;
-	}
-
-	pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
-
-	viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
-	       "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
-	       "cflags[0x%04x] lso_max[%u]\n",
-	       pkt.xfer_mode, pkt.addr_type,
-	       (unsigned long long)pkt.addr,
-	       pkt.ack_freq, pkt.plnk_updt, pkt.options,
-	       (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
-
-
-	return vio_ldc_send(vio, &pkt, sizeof(pkt));
-}
-
-static int handle_attr_info(struct vio_driver_state *vio,
-			    struct vio_net_attr_info *pkt)
-{
-	struct vnet_port *port = to_vnet_port(vio);
-	u64	localmtu;
-	u8	xfer_mode;
-
-	viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
-	       "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
-	       " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
-	       pkt->xfer_mode, pkt->addr_type,
-	       (unsigned long long)pkt->addr,
-	       pkt->ack_freq, pkt->plnk_updt, pkt->options,
-	       (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
-	       pkt->ipv4_lso_maxlen);
-
-	pkt->tag.sid = vio_send_sid(vio);
-
-	xfer_mode = pkt->xfer_mode;
-	/* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
-	if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
-		xfer_mode = VIO_NEW_DRING_MODE;
-
-	/* MTU negotiation:
-	 *	< v1.3 - ETH_FRAME_LEN exactly
-	 *	> v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
-	 *			pkt->mtu for ACK
-	 *	= v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
-	 */
-	if (vio_version_before(vio, 1, 3)) {
-		localmtu = ETH_FRAME_LEN;
-	} else if (vio_version_after(vio, 1, 3)) {
-		localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
-		localmtu = min(pkt->mtu, localmtu);
-		pkt->mtu = localmtu;
-	} else { /* v1.3 */
-		localmtu = ETH_FRAME_LEN + VLAN_HLEN;
-	}
-	port->rmtu = localmtu;
-
-	/* LSO negotiation */
-	if (vio_version_after_eq(vio, 1, 7))
-		port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
-	else
-		port->tso = false;
-	if (port->tso) {
-		if (!port->tsolen)
-			port->tsolen = VNET_MAXTSO;
-		port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
-		if (port->tsolen < VNET_MINTSO) {
-			port->tso = false;
-			port->tsolen = 0;
-			pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
-		}
-		pkt->ipv4_lso_maxlen = port->tsolen;
-	} else {
-		pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
-		pkt->ipv4_lso_maxlen = 0;
-	}
-
-	/* for version >= 1.6, ACK packet mode we support */
-	if (vio_version_after_eq(vio, 1, 6)) {
-		pkt->xfer_mode = VIO_NEW_DRING_MODE;
-		pkt->options = VIO_TX_DRING;
-	}
-
-	if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
-	    pkt->addr_type != VNET_ADDR_ETHERMAC ||
-	    pkt->mtu != localmtu) {
-		viodbg(HS, "SEND NET ATTR NACK\n");
-
-		pkt->tag.stype = VIO_SUBTYPE_NACK;
-
-		(void) vio_ldc_send(vio, pkt, sizeof(*pkt));
-
-		return -ECONNRESET;
-	} else {
-		viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
-		       "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
-		       "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
-		       pkt->xfer_mode, pkt->addr_type,
-		       (unsigned long long)pkt->addr,
-		       pkt->ack_freq, pkt->plnk_updt, pkt->options,
-		       (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
-		       pkt->ipv4_lso_maxlen);
-
-		pkt->tag.stype = VIO_SUBTYPE_ACK;
-
-		return vio_ldc_send(vio, pkt, sizeof(*pkt));
-	}
-
-}
-
-static int handle_attr_ack(struct vio_driver_state *vio,
-			   struct vio_net_attr_info *pkt)
-{
-	viodbg(HS, "GOT NET ATTR ACK\n");
-
-	return 0;
-}
-
-static int handle_attr_nack(struct vio_driver_state *vio,
-			    struct vio_net_attr_info *pkt)
-{
-	viodbg(HS, "GOT NET ATTR NACK\n");
-
-	return -ECONNRESET;
-}
-
-static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
-{
-	struct vio_net_attr_info *pkt = arg;
-
-	switch (pkt->tag.stype) {
-	case VIO_SUBTYPE_INFO:
-		return handle_attr_info(vio, pkt);
-
-	case VIO_SUBTYPE_ACK:
-		return handle_attr_ack(vio, pkt);
-
-	case VIO_SUBTYPE_NACK:
-		return handle_attr_nack(vio, pkt);
-
-	default:
-		return -ECONNRESET;
-	}
-}
-
-static void vnet_handshake_complete(struct vio_driver_state *vio)
-{
-	struct vio_dring_state *dr;
-
-	dr = &vio->drings[VIO_DRIVER_RX_RING];
-	dr->snd_nxt = dr->rcv_nxt = 1;
-
-	dr = &vio->drings[VIO_DRIVER_TX_RING];
-	dr->snd_nxt = dr->rcv_nxt = 1;
-}
-
-/* The hypervisor interface that implements copying to/from imported
- * memory from another domain requires that copies are done to 8-byte
- * aligned buffers, and that the lengths of such copies are also 8-byte
- * multiples.
- *
- * So we align skb->data to an 8-byte multiple and pad-out the data
- * area so we can round the copy length up to the next multiple of
- * 8 for the copy.
- *
- * The transmitter puts the actual start of the packet 6 bytes into
- * the buffer it sends over, so that the IP headers after the ethernet
- * header are aligned properly.  These 6 bytes are not in the descriptor
- * length, they are simply implied.  This offset is represented using
- * the VNET_PACKET_SKIP macro.
- */
-static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
-					   unsigned int len)
-{
-	struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
-	unsigned long addr, off;
-
-	if (unlikely(!skb))
-		return NULL;
-
-	addr = (unsigned long) skb->data;
-	off = ((addr + 7UL) & ~7UL) - addr;
-	if (off)
-		skb_reserve(skb, off);
-
-	return skb;
-}
-
-static inline void vnet_fullcsum(struct sk_buff *skb)
-{
-	struct iphdr *iph = ip_hdr(skb);
-	int offset = skb_transport_offset(skb);
-
-	if (skb->protocol != htons(ETH_P_IP))
-		return;
-	if (iph->protocol != IPPROTO_TCP &&
-	    iph->protocol != IPPROTO_UDP)
-		return;
-	skb->ip_summed = CHECKSUM_NONE;
-	skb->csum_level = 1;
-	skb->csum = 0;
-	if (iph->protocol == IPPROTO_TCP) {
-		struct tcphdr *ptcp = tcp_hdr(skb);
-
-		ptcp->check = 0;
-		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
-		ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
-						skb->len - offset, IPPROTO_TCP,
-						skb->csum);
-	} else if (iph->protocol == IPPROTO_UDP) {
-		struct udphdr *pudp = udp_hdr(skb);
-
-		pudp->check = 0;
-		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
-		pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
-						skb->len - offset, IPPROTO_UDP,
-						skb->csum);
-	}
-}
-
-static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
-{
-	struct net_device *dev = port->vp->dev;
-	unsigned int len = desc->size;
-	unsigned int copy_len;
-	struct sk_buff *skb;
-	int maxlen;
-	int err;
-
-	err = -EMSGSIZE;
-	if (port->tso && port->tsolen > port->rmtu)
-		maxlen = port->tsolen;
-	else
-		maxlen = port->rmtu;
-	if (unlikely(len < ETH_ZLEN || len > maxlen)) {
-		dev->stats.rx_length_errors++;
-		goto out_dropped;
-	}
-
-	skb = alloc_and_align_skb(dev, len);
-	err = -ENOMEM;
-	if (unlikely(!skb)) {
-		dev->stats.rx_missed_errors++;
-		goto out_dropped;
-	}
-
-	copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
-	skb_put(skb, copy_len);
-	err = ldc_copy(port->vio.lp, LDC_COPY_IN,
-		       skb->data, copy_len, 0,
-		       desc->cookies, desc->ncookies);
-	if (unlikely(err < 0)) {
-		dev->stats.rx_frame_errors++;
-		goto out_free_skb;
-	}
-
-	skb_pull(skb, VNET_PACKET_SKIP);
-	skb_trim(skb, len);
-	skb->protocol = eth_type_trans(skb, dev);
-
-	if (vio_version_after_eq(&port->vio, 1, 8)) {
-		struct vio_net_dext *dext = vio_net_ext(desc);
-
-		skb_reset_network_header(skb);
-
-		if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
-			if (skb->protocol == ETH_P_IP) {
-				struct iphdr *iph = ip_hdr(skb);
-
-				iph->check = 0;
-				ip_send_check(iph);
-			}
-		}
-		if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
-		    skb->ip_summed == CHECKSUM_NONE) {
-			if (skb->protocol == htons(ETH_P_IP)) {
-				struct iphdr *iph = ip_hdr(skb);
-				int ihl = iph->ihl * 4;
-
-				skb_reset_transport_header(skb);
-				skb_set_transport_header(skb, ihl);
-				vnet_fullcsum(skb);
-			}
-		}
-		if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
-			skb->ip_summed = CHECKSUM_PARTIAL;
-			skb->csum_level = 0;
-			if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
-				skb->csum_level = 1;
-		}
-	}
-
-	skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
-
-	dev->stats.rx_packets++;
-	dev->stats.rx_bytes += len;
-	napi_gro_receive(&port->napi, skb);
-	return 0;
-
-out_free_skb:
-	kfree_skb(skb);
-
-out_dropped:
-	dev->stats.rx_dropped++;
-	return err;
-}
-
-static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
-			 u32 start, u32 end, u8 vio_dring_state)
-{
-	struct vio_dring_data hdr = {
-		.tag = {
-			.type		= VIO_TYPE_DATA,
-			.stype		= VIO_SUBTYPE_ACK,
-			.stype_env	= VIO_DRING_DATA,
-			.sid		= vio_send_sid(&port->vio),
-		},
-		.dring_ident		= dr->ident,
-		.start_idx		= start,
-		.end_idx		= end,
-		.state			= vio_dring_state,
-	};
-	int err, delay;
-	int retries = 0;
-
-	hdr.seq = dr->snd_nxt;
-	delay = 1;
-	do {
-		err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
-		if (err > 0) {
-			dr->snd_nxt++;
-			break;
-		}
-		udelay(delay);
-		if ((delay <<= 1) > 128)
-			delay = 128;
-		if (retries++ > VNET_MAX_RETRIES) {
-			pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
-				port->raddr[0], port->raddr[1],
-				port->raddr[2], port->raddr[3],
-				port->raddr[4], port->raddr[5]);
-			break;
-		}
-	} while (err == -EAGAIN);
-
-	if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
-		port->stop_rx_idx = end;
-		port->stop_rx = true;
-	} else {
-		port->stop_rx_idx = 0;
-		port->stop_rx = false;
-	}
-
-	return err;
-}
-
-static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
-					struct vio_dring_state *dr,
-					u32 index)
-{
-	struct vio_net_desc *desc = port->vio.desc_buf;
-	int err;
-
-	err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
-				  (index * dr->entry_size),
-				  dr->cookies, dr->ncookies);
-	if (err < 0)
-		return ERR_PTR(err);
-
-	return desc;
-}
-
-static int put_rx_desc(struct vnet_port *port,
-		       struct vio_dring_state *dr,
-		       struct vio_net_desc *desc,
-		       u32 index)
-{
-	int err;
-
-	err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
-				  (index * dr->entry_size),
-				  dr->cookies, dr->ncookies);
-	if (err < 0)
-		return err;
-
-	return 0;
-}
-
-static int vnet_walk_rx_one(struct vnet_port *port,
-			    struct vio_dring_state *dr,
-			    u32 index, int *needs_ack)
-{
-	struct vio_net_desc *desc = get_rx_desc(port, dr, index);
-	struct vio_driver_state *vio = &port->vio;
-	int err;
-
-	BUG_ON(desc == NULL);
-	if (IS_ERR(desc))
-		return PTR_ERR(desc);
-
-	if (desc->hdr.state != VIO_DESC_READY)
-		return 1;
-
-	dma_rmb();
-
-	viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
-	       desc->hdr.state, desc->hdr.ack,
-	       desc->size, desc->ncookies,
-	       desc->cookies[0].cookie_addr,
-	       desc->cookies[0].cookie_size);
-
-	err = vnet_rx_one(port, desc);
-	if (err == -ECONNRESET)
-		return err;
-	trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
-			  index, desc->hdr.ack);
-	desc->hdr.state = VIO_DESC_DONE;
-	err = put_rx_desc(port, dr, desc, index);
-	if (err < 0)
-		return err;
-	*needs_ack = desc->hdr.ack;
-	return 0;
-}
-
-static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
-			u32 start, u32 end, int *npkts, int budget)
-{
-	struct vio_driver_state *vio = &port->vio;
-	int ack_start = -1, ack_end = -1;
-	bool send_ack = true;
-
-	end = (end == (u32) -1) ? vio_dring_prev(dr, start)
-				: vio_dring_next(dr, end);
-
-	viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
-
-	while (start != end) {
-		int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
-		if (err == -ECONNRESET)
-			return err;
-		if (err != 0)
-			break;
-		(*npkts)++;
-		if (ack_start == -1)
-			ack_start = start;
-		ack_end = start;
-		start = vio_dring_next(dr, start);
-		if (ack && start != end) {
-			err = vnet_send_ack(port, dr, ack_start, ack_end,
-					    VIO_DRING_ACTIVE);
-			if (err == -ECONNRESET)
-				return err;
-			ack_start = -1;
-		}
-		if ((*npkts) >= budget) {
-			send_ack = false;
-			break;
-		}
-	}
-	if (unlikely(ack_start == -1))
-		ack_start = ack_end = vio_dring_prev(dr, start);
-	if (send_ack) {
-		port->napi_resume = false;
-		trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
-					       port->vio._peer_sid,
-					       ack_end, *npkts);
-		return vnet_send_ack(port, dr, ack_start, ack_end,
-				     VIO_DRING_STOPPED);
-	} else  {
-		trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
-						port->vio._peer_sid,
-						ack_end, *npkts);
-		port->napi_resume = true;
-		port->napi_stop_idx = ack_end;
-		return 1;
-	}
-}
-
-static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
-		   int budget)
-{
-	struct vio_dring_data *pkt = msgbuf;
-	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
-	struct vio_driver_state *vio = &port->vio;
-
-	viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
-	       pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
-
-	if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
-		return 0;
-	if (unlikely(pkt->seq != dr->rcv_nxt)) {
-		pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
-		       pkt->seq, dr->rcv_nxt);
-		return 0;
-	}
-
-	if (!port->napi_resume)
-		dr->rcv_nxt++;
-
-	/* XXX Validate pkt->start_idx and pkt->end_idx XXX */
-
-	return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
-			    npkts, budget);
-}
-
-static int idx_is_pending(struct vio_dring_state *dr, u32 end)
-{
-	u32 idx = dr->cons;
-	int found = 0;
-
-	while (idx != dr->prod) {
-		if (idx == end) {
-			found = 1;
-			break;
-		}
-		idx = vio_dring_next(dr, idx);
-	}
-	return found;
-}
-
-static int vnet_ack(struct vnet_port *port, void *msgbuf)
-{
-	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-	struct vio_dring_data *pkt = msgbuf;
-	struct net_device *dev;
-	struct vnet *vp;
-	u32 end;
-	struct vio_net_desc *desc;
-	struct netdev_queue *txq;
-
-	if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
-		return 0;
-
-	end = pkt->end_idx;
-	vp = port->vp;
-	dev = vp->dev;
-	netif_tx_lock(dev);
-	if (unlikely(!idx_is_pending(dr, end))) {
-		netif_tx_unlock(dev);
-		return 0;
-	}
-
-	/* sync for race conditions with vnet_start_xmit() and tell xmit it
-	 * is time to send a trigger.
-	 */
-	trace_vnet_rx_stopped_ack(port->vio._local_sid,
-				  port->vio._peer_sid, end);
-	dr->cons = vio_dring_next(dr, end);
-	desc = vio_dring_entry(dr, dr->cons);
-	if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
-		/* vnet_start_xmit() just populated this dring but missed
-		 * sending the "start" LDC message to the consumer.
-		 * Send a "start" trigger on its behalf.
-		 */
-		if (__vnet_tx_trigger(port, dr->cons) > 0)
-			port->start_cons = false;
-		else
-			port->start_cons = true;
-	} else {
-		port->start_cons = true;
-	}
-	netif_tx_unlock(dev);
-
-	txq = netdev_get_tx_queue(dev, port->q_index);
-	if (unlikely(netif_tx_queue_stopped(txq) &&
-		     vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
-		return 1;
-
-	return 0;
-}
-
-static int vnet_nack(struct vnet_port *port, void *msgbuf)
-{
-	/* XXX just reset or similar XXX */
-	return 0;
-}
-
-static int handle_mcast(struct vnet_port *port, void *msgbuf)
-{
-	struct vio_net_mcast_info *pkt = msgbuf;
-
-	if (pkt->tag.stype != VIO_SUBTYPE_ACK)
-		pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
-		       port->vp->dev->name,
-		       pkt->tag.type,
-		       pkt->tag.stype,
-		       pkt->tag.stype_env,
-		       pkt->tag.sid);
-
-	return 0;
-}
-
-/* Got back a STOPPED LDC message on port. If the queue is stopped,
- * wake it up so that we'll send out another START message at the
- * next TX.
- */
-static void maybe_tx_wakeup(struct vnet_port *port)
-{
-	struct netdev_queue *txq;
-
-	txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
-	__netif_tx_lock(txq, smp_processor_id());
-	if (likely(netif_tx_queue_stopped(txq))) {
-		struct vio_dring_state *dr;
-
-		dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-		netif_tx_wake_queue(txq);
-	}
-	__netif_tx_unlock(txq);
-}
-
-static inline bool port_is_up(struct vnet_port *vnet)
+static void vnet_get_drvinfo(struct net_device *dev,
+			     struct ethtool_drvinfo *info)
 {
-	struct vio_driver_state *vio = &vnet->vio;
-
-	return !!(vio->hs_state & VIO_HS_COMPLETE);
+	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
 }
 
-static int vnet_event_napi(struct vnet_port *port, int budget)
+static u32 vnet_get_msglevel(struct net_device *dev)
 {
-	struct vio_driver_state *vio = &port->vio;
-	int tx_wakeup, err;
-	int npkts = 0;
-	int event = (port->rx_event & LDC_EVENT_RESET);
-
-ldc_ctrl:
-	if (unlikely(event == LDC_EVENT_RESET ||
-		     event == LDC_EVENT_UP)) {
-		vio_link_state_change(vio, event);
-
-		if (event == LDC_EVENT_RESET) {
-			vnet_port_reset(port);
-			vio_port_up(vio);
-		}
-		port->rx_event = 0;
-		return 0;
-	}
-	/* We may have multiple LDC events in rx_event. Unroll send_events() */
-	event = (port->rx_event & LDC_EVENT_UP);
-	port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
-	if (event == LDC_EVENT_UP)
-		goto ldc_ctrl;
-	event = port->rx_event;
-	if (!(event & LDC_EVENT_DATA_READY))
-		return 0;
-
-	/* we dont expect any other bits than RESET, UP, DATA_READY */
-	BUG_ON(event != LDC_EVENT_DATA_READY);
-
-	tx_wakeup = err = 0;
-	while (1) {
-		union {
-			struct vio_msg_tag tag;
-			u64 raw[8];
-		} msgbuf;
-
-		if (port->napi_resume) {
-			struct vio_dring_data *pkt =
-				(struct vio_dring_data *)&msgbuf;
-			struct vio_dring_state *dr =
-				&port->vio.drings[VIO_DRIVER_RX_RING];
-
-			pkt->tag.type = VIO_TYPE_DATA;
-			pkt->tag.stype = VIO_SUBTYPE_INFO;
-			pkt->tag.stype_env = VIO_DRING_DATA;
-			pkt->seq = dr->rcv_nxt;
-			pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
-			pkt->end_idx = -1;
-			goto napi_resume;
-		}
-		err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
-		if (unlikely(err < 0)) {
-			if (err == -ECONNRESET)
-				vio_conn_reset(vio);
-			break;
-		}
-		if (err == 0)
-			break;
-		viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
-		       msgbuf.tag.type,
-		       msgbuf.tag.stype,
-		       msgbuf.tag.stype_env,
-		       msgbuf.tag.sid);
-		err = vio_validate_sid(vio, &msgbuf.tag);
-		if (err < 0)
-			break;
-napi_resume:
-		if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
-			if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
-				if (!port_is_up(port)) {
-					/* failures like handshake_failure()
-					 * may have cleaned up dring, but
-					 * NAPI polling may bring us here.
-					 */
-					err = -ECONNRESET;
-					break;
-				}
-				err = vnet_rx(port, &msgbuf, &npkts, budget);
-				if (npkts >= budget)
-					break;
-				if (npkts == 0)
-					break;
-			} else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
-				err = vnet_ack(port, &msgbuf);
-				if (err > 0)
-					tx_wakeup |= err;
-			} else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
-				err = vnet_nack(port, &msgbuf);
-			}
-		} else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
-			if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
-				err = handle_mcast(port, &msgbuf);
-			else
-				err = vio_control_pkt_engine(vio, &msgbuf);
-			if (err)
-				break;
-		} else {
-			err = vnet_handle_unknown(port, &msgbuf);
-		}
-		if (err == -ECONNRESET)
-			break;
-	}
-	if (unlikely(tx_wakeup && err != -ECONNRESET))
-		maybe_tx_wakeup(port);
-	return npkts;
-}
+	struct vnet *vp = netdev_priv(dev);
 
-static int vnet_poll(struct napi_struct *napi, int budget)
-{
-	struct vnet_port *port = container_of(napi, struct vnet_port, napi);
-	struct vio_driver_state *vio = &port->vio;
-	int processed = vnet_event_napi(port, budget);
-
-	if (processed < budget) {
-		napi_complete(napi);
-		port->rx_event &= ~LDC_EVENT_DATA_READY;
-		vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
-	}
-	return processed;
+	return vp->msg_enable;
 }
 
-static void vnet_event(void *arg, int event)
+static void vnet_set_msglevel(struct net_device *dev, u32 value)
 {
-	struct vnet_port *port = arg;
-	struct vio_driver_state *vio = &port->vio;
-
-	port->rx_event |= event;
-	vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
-	napi_schedule(&port->napi);
+	struct vnet *vp = netdev_priv(dev);
 
+	vp->msg_enable = value;
 }
 
-static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
-{
-	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-	struct vio_dring_data hdr = {
-		.tag = {
-			.type		= VIO_TYPE_DATA,
-			.stype		= VIO_SUBTYPE_INFO,
-			.stype_env	= VIO_DRING_DATA,
-			.sid		= vio_send_sid(&port->vio),
-		},
-		.dring_ident		= dr->ident,
-		.start_idx		= start,
-		.end_idx		= (u32) -1,
-	};
-	int err, delay;
-	int retries = 0;
-
-	if (port->stop_rx) {
-		trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
-						  port->vio._peer_sid,
-						  port->stop_rx_idx, -1);
-		err = vnet_send_ack(port,
-				    &port->vio.drings[VIO_DRIVER_RX_RING],
-				    port->stop_rx_idx, -1,
-				    VIO_DRING_STOPPED);
-		if (err <= 0)
-			return err;
-	}
-
-	hdr.seq = dr->snd_nxt;
-	delay = 1;
-	do {
-		err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
-		if (err > 0) {
-			dr->snd_nxt++;
-			break;
-		}
-		udelay(delay);
-		if ((delay <<= 1) > 128)
-			delay = 128;
-		if (retries++ > VNET_MAX_RETRIES)
-			break;
-	} while (err == -EAGAIN);
-	trace_vnet_tx_trigger(port->vio._local_sid,
-			      port->vio._peer_sid, start, err);
+static const struct ethtool_ops vnet_ethtool_ops = {
+	.get_drvinfo		= vnet_get_drvinfo,
+	.get_msglevel		= vnet_get_msglevel,
+	.set_msglevel		= vnet_set_msglevel,
+	.get_link		= ethtool_op_get_link,
+};
 
-	return err;
-}
+static LIST_HEAD(vnet_list);
+static DEFINE_MUTEX(vnet_list_mutex);
 
-struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
+static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
 {
 	unsigned int hash = vnet_hashfn(skb->data);
 	struct hlist_head *hp = &vp->port_hash[hash];
 	struct vnet_port *port;
 
 	hlist_for_each_entry_rcu(port, hp, hash) {
-		if (!port_is_up(port))
+		if (!sunvnet_port_is_up_common(port))
 			continue;
 		if (ether_addr_equal(port->raddr, skb->data))
 			return port;
@@ -944,841 +102,64 @@ struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
 	list_for_each_entry_rcu(port, &vp->port_list, list) {
 		if (!port->switch_port)
 			continue;
-		if (!port_is_up(port))
+		if (!sunvnet_port_is_up_common(port))
 			continue;
 		return port;
 	}
 	return NULL;
 }
 
-static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
-					  unsigned *pending)
-{
-	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-	struct sk_buff *skb = NULL;
-	int i, txi;
-
-	*pending = 0;
-
-	txi = dr->prod;
-	for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
-		struct vio_net_desc *d;
-
-		--txi;
-		if (txi < 0)
-			txi = VNET_TX_RING_SIZE-1;
-
-		d = vio_dring_entry(dr, txi);
-
-		if (d->hdr.state == VIO_DESC_READY) {
-			(*pending)++;
-			continue;
-		}
-		if (port->tx_bufs[txi].skb) {
-			if (d->hdr.state != VIO_DESC_DONE)
-				pr_notice("invalid ring buffer state %d\n",
-					  d->hdr.state);
-			BUG_ON(port->tx_bufs[txi].skb->next);
-
-			port->tx_bufs[txi].skb->next = skb;
-			skb = port->tx_bufs[txi].skb;
-			port->tx_bufs[txi].skb = NULL;
-
-			ldc_unmap(port->vio.lp,
-				  port->tx_bufs[txi].cookies,
-				  port->tx_bufs[txi].ncookies);
-		} else if (d->hdr.state == VIO_DESC_FREE)
-			break;
-		d->hdr.state = VIO_DESC_FREE;
-	}
-	return skb;
-}
-
-static inline void vnet_free_skbs(struct sk_buff *skb)
-{
-	struct sk_buff *next;
-
-	while (skb) {
-		next = skb->next;
-		skb->next = NULL;
-		dev_kfree_skb(skb);
-		skb = next;
-	}
-}
-
-static void vnet_clean_timer_expire(unsigned long port0)
-{
-	struct vnet_port *port = (struct vnet_port *)port0;
-	struct sk_buff *freeskbs;
-	unsigned pending;
-
-	netif_tx_lock(port->vp->dev);
-	freeskbs = vnet_clean_tx_ring(port, &pending);
-	netif_tx_unlock(port->vp->dev);
-
-	vnet_free_skbs(freeskbs);
-
-	if (pending)
-		(void)mod_timer(&port->clean_timer,
-				jiffies + VNET_CLEAN_TIMEOUT);
-	 else
-		del_timer(&port->clean_timer);
-}
-
-static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
-			       struct ldc_trans_cookie *cookies, int ncookies,
-			       unsigned int map_perm)
+/* func arg to vnet_start_xmit_common() to get the proper tx port */
+static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb,
+					   struct net_device *dev)
 {
-	int i, nc, err, blen;
-
-	/* header */
-	blen = skb_headlen(skb);
-	if (blen < ETH_ZLEN)
-		blen = ETH_ZLEN;
-	blen += VNET_PACKET_SKIP;
-	blen += 8 - (blen & 7);
-
-	err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
-			     ncookies, map_perm);
-	if (err < 0)
-		return err;
-	nc = err;
-
-	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
-		skb_frag_t *f = &skb_shinfo(skb)->frags[i];
-		u8 *vaddr;
-
-		if (nc < ncookies) {
-			vaddr = kmap_atomic(skb_frag_page(f));
-			blen = skb_frag_size(f);
-			blen += 8 - (blen & 7);
-			err = ldc_map_single(lp, vaddr + f->page_offset,
-					     blen, cookies + nc, ncookies - nc,
-					     map_perm);
-			kunmap_atomic(vaddr);
-		} else {
-			err = -EMSGSIZE;
-		}
+	struct vnet *vp = netdev_priv(dev);
 
-		if (err < 0) {
-			ldc_unmap(lp, cookies, nc);
-			return err;
-		}
-		nc += err;
-	}
-	return nc;
+	return __tx_port_find(vp, skb);
 }
 
-static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
-{
-	struct sk_buff *nskb;
-	int i, len, pad, docopy;
-
-	len = skb->len;
-	pad = 0;
-	if (len < ETH_ZLEN) {
-		pad += ETH_ZLEN - skb->len;
-		len += pad;
-	}
-	len += VNET_PACKET_SKIP;
-	pad += 8 - (len & 7);
-
-	/* make sure we have enough cookies and alignment in every frag */
-	docopy = skb_shinfo(skb)->nr_frags >= ncookies;
-	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
-		skb_frag_t *f = &skb_shinfo(skb)->frags[i];
-
-		docopy |= f->page_offset & 7;
-	}
-	if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
-	    skb_tailroom(skb) < pad ||
-	    skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
-		int start = 0, offset;
-		__wsum csum;
-
-		len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
-		nskb = alloc_and_align_skb(skb->dev, len);
-		if (nskb == NULL) {
-			dev_kfree_skb(skb);
-			return NULL;
-		}
-		skb_reserve(nskb, VNET_PACKET_SKIP);
-
-		nskb->protocol = skb->protocol;
-		offset = skb_mac_header(skb) - skb->data;
-		skb_set_mac_header(nskb, offset);
-		offset = skb_network_header(skb) - skb->data;
-		skb_set_network_header(nskb, offset);
-		offset = skb_transport_header(skb) - skb->data;
-		skb_set_transport_header(nskb, offset);
-
-		offset = 0;
-		nskb->csum_offset = skb->csum_offset;
-		nskb->ip_summed = skb->ip_summed;
-
-		if (skb->ip_summed == CHECKSUM_PARTIAL)
-			start = skb_checksum_start_offset(skb);
-		if (start) {
-			struct iphdr *iph = ip_hdr(nskb);
-			int offset = start + nskb->csum_offset;
-
-			if (skb_copy_bits(skb, 0, nskb->data, start)) {
-				dev_kfree_skb(nskb);
-				dev_kfree_skb(skb);
-				return NULL;
-			}
-			*(__sum16 *)(skb->data + offset) = 0;
-			csum = skb_copy_and_csum_bits(skb, start,
-						      nskb->data + start,
-						      skb->len - start, 0);
-			if (iph->protocol == IPPROTO_TCP ||
-			    iph->protocol == IPPROTO_UDP) {
-				csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
-							 skb->len - start,
-							 iph->protocol, csum);
-			}
-			*(__sum16 *)(nskb->data + offset) = csum;
-
-			nskb->ip_summed = CHECKSUM_NONE;
-		} else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
-			dev_kfree_skb(nskb);
-			dev_kfree_skb(skb);
-			return NULL;
-		}
-		(void)skb_put(nskb, skb->len);
-		if (skb_is_gso(skb)) {
-			skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
-			skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
-		}
-		nskb->queue_mapping = skb->queue_mapping;
-		dev_kfree_skb(skb);
-		skb = nskb;
-	}
-	return skb;
-}
-
-static u16
-vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
-		  void *accel_priv, select_queue_fallback_t fallback)
+static u16 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
+			     void *accel_priv, select_queue_fallback_t fallback)
 {
 	struct vnet *vp = netdev_priv(dev);
 	struct vnet_port *port = __tx_port_find(vp, skb);
 
-	if (port == NULL)
+	if (!port)
 		return 0;
-	return port->q_index;
-}
-
-static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev);
-
-static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
-{
-	struct net_device *dev = port->vp->dev;
-	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-	struct sk_buff *segs;
-	int maclen, datalen;
-	int status;
-	int gso_size, gso_type, gso_segs;
-	int hlen = skb_transport_header(skb) - skb_mac_header(skb);
-	int proto = IPPROTO_IP;
-
-	if (skb->protocol == htons(ETH_P_IP))
-		proto = ip_hdr(skb)->protocol;
-	else if (skb->protocol == htons(ETH_P_IPV6))
-		proto = ipv6_hdr(skb)->nexthdr;
-
-	if (proto == IPPROTO_TCP)
-		hlen += tcp_hdr(skb)->doff * 4;
-	else if (proto == IPPROTO_UDP)
-		hlen += sizeof(struct udphdr);
-	else {
-		pr_err("vnet_handle_offloads GSO with unknown transport "
-		       "protocol %d tproto %d\n", skb->protocol, proto);
-		hlen = 128; /* XXX */
-	}
-	datalen = port->tsolen - hlen;
-
-	gso_size = skb_shinfo(skb)->gso_size;
-	gso_type = skb_shinfo(skb)->gso_type;
-	gso_segs = skb_shinfo(skb)->gso_segs;
-
-	if (port->tso && gso_size < datalen)
-		gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
-
-	if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
-		struct netdev_queue *txq;
-
-		txq  = netdev_get_tx_queue(dev, port->q_index);
-		netif_tx_stop_queue(txq);
-		if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
-			return NETDEV_TX_BUSY;
-		netif_tx_wake_queue(txq);
-	}
-
-	maclen = skb_network_header(skb) - skb_mac_header(skb);
-	skb_pull(skb, maclen);
 
-	if (port->tso && gso_size < datalen) {
-		if (skb_unclone(skb, GFP_ATOMIC))
-			goto out_dropped;
-
-		/* segment to TSO size */
-		skb_shinfo(skb)->gso_size = datalen;
-		skb_shinfo(skb)->gso_segs = gso_segs;
-	}
-	segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
-	if (IS_ERR(segs))
-		goto out_dropped;
-
-	skb_push(skb, maclen);
-	skb_reset_mac_header(skb);
-
-	status = 0;
-	while (segs) {
-		struct sk_buff *curr = segs;
-
-		segs = segs->next;
-		curr->next = NULL;
-		if (port->tso && curr->len > dev->mtu) {
-			skb_shinfo(curr)->gso_size = gso_size;
-			skb_shinfo(curr)->gso_type = gso_type;
-			skb_shinfo(curr)->gso_segs =
-				DIV_ROUND_UP(curr->len - hlen, gso_size);
-		} else
-			skb_shinfo(curr)->gso_size = 0;
-
-		skb_push(curr, maclen);
-		skb_reset_mac_header(curr);
-		memcpy(skb_mac_header(curr), skb_mac_header(skb),
-		       maclen);
-		curr->csum_start = skb_transport_header(curr) - curr->head;
-		if (ip_hdr(curr)->protocol == IPPROTO_TCP)
-			curr->csum_offset = offsetof(struct tcphdr, check);
-		else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
-			curr->csum_offset = offsetof(struct udphdr, check);
-
-		if (!(status & NETDEV_TX_MASK))
-			status = vnet_start_xmit(curr, dev);
-		if (status & NETDEV_TX_MASK)
-			dev_kfree_skb_any(curr);
-	}
-
-	if (!(status & NETDEV_TX_MASK))
-		dev_kfree_skb_any(skb);
-	return status;
-out_dropped:
-	dev->stats.tx_dropped++;
-	dev_kfree_skb_any(skb);
-	return NETDEV_TX_OK;
+	return port->q_index;
 }
 
+/* Wrappers to common functions */
 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
-	struct vnet *vp = netdev_priv(dev);
-	struct vnet_port *port = NULL;
-	struct vio_dring_state *dr;
-	struct vio_net_desc *d;
-	unsigned int len;
-	struct sk_buff *freeskbs = NULL;
-	int i, err, txi;
-	unsigned pending = 0;
-	struct netdev_queue *txq;
-
-	rcu_read_lock();
-	port = __tx_port_find(vp, skb);
-	if (unlikely(!port)) {
-		rcu_read_unlock();
-		goto out_dropped;
-	}
-
-	if (skb_is_gso(skb) && skb->len > port->tsolen) {
-		err = vnet_handle_offloads(port, skb);
-		rcu_read_unlock();
-		return err;
-	}
-
-	if (!skb_is_gso(skb) && skb->len > port->rmtu) {
-		unsigned long localmtu = port->rmtu - ETH_HLEN;
-
-		if (vio_version_after_eq(&port->vio, 1, 3))
-			localmtu -= VLAN_HLEN;
-
-		if (skb->protocol == htons(ETH_P_IP)) {
-			struct flowi4 fl4;
-			struct rtable *rt = NULL;
-
-			memset(&fl4, 0, sizeof(fl4));
-			fl4.flowi4_oif = dev->ifindex;
-			fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
-			fl4.daddr = ip_hdr(skb)->daddr;
-			fl4.saddr = ip_hdr(skb)->saddr;
-
-			rt = ip_route_output_key(dev_net(dev), &fl4);
-			rcu_read_unlock();
-			if (!IS_ERR(rt)) {
-				skb_dst_set(skb, &rt->dst);
-				icmp_send(skb, ICMP_DEST_UNREACH,
-					  ICMP_FRAG_NEEDED,
-					  htonl(localmtu));
-			}
-		}
-#if IS_ENABLED(CONFIG_IPV6)
-		else if (skb->protocol == htons(ETH_P_IPV6))
-			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
-#endif
-		goto out_dropped;
-	}
-
-	skb = vnet_skb_shape(skb, 2);
-
-	if (unlikely(!skb))
-		goto out_dropped;
-
-	if (skb->ip_summed == CHECKSUM_PARTIAL)
-		vnet_fullcsum(skb);
-
-	dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-	i = skb_get_queue_mapping(skb);
-	txq = netdev_get_tx_queue(dev, i);
-	if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
-		if (!netif_tx_queue_stopped(txq)) {
-			netif_tx_stop_queue(txq);
-
-			/* This is a hard error, log it. */
-			netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
-			dev->stats.tx_errors++;
-		}
-		rcu_read_unlock();
-		return NETDEV_TX_BUSY;
-	}
-
-	d = vio_dring_cur(dr);
-
-	txi = dr->prod;
-
-	freeskbs = vnet_clean_tx_ring(port, &pending);
-
-	BUG_ON(port->tx_bufs[txi].skb);
-
-	len = skb->len;
-	if (len < ETH_ZLEN)
-		len = ETH_ZLEN;
-
-	err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
-			   (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
-	if (err < 0) {
-		netdev_info(dev, "tx buffer map error %d\n", err);
-		goto out_dropped;
-	}
-
-	port->tx_bufs[txi].skb = skb;
-	skb = NULL;
-	port->tx_bufs[txi].ncookies = err;
-
-	/* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
-	 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
-	 * the protocol itself does not require it as long as the peer
-	 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
-	 *
-	 * An ACK for every packet in the ring is expensive as the
-	 * sending of LDC messages is slow and affects performance.
-	 */
-	d->hdr.ack = VIO_ACK_DISABLE;
-	d->size = len;
-	d->ncookies = port->tx_bufs[txi].ncookies;
-	for (i = 0; i < d->ncookies; i++)
-		d->cookies[i] = port->tx_bufs[txi].cookies[i];
-	if (vio_version_after_eq(&port->vio, 1, 7)) {
-		struct vio_net_dext *dext = vio_net_ext(d);
-
-		memset(dext, 0, sizeof(*dext));
-		if (skb_is_gso(port->tx_bufs[txi].skb)) {
-			dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
-					     ->gso_size;
-			dext->flags |= VNET_PKT_IPV4_LSO;
-		}
-		if (vio_version_after_eq(&port->vio, 1, 8) &&
-		    !port->switch_port) {
-			dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
-			dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
-		}
-	}
-
-	/* This has to be a non-SMP write barrier because we are writing
-	 * to memory which is shared with the peer LDOM.
-	 */
-	dma_wmb();
-
-	d->hdr.state = VIO_DESC_READY;
-
-	/* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
-	 * to notify the consumer that some descriptors are READY.
-	 * After that "start" trigger, no additional triggers are needed until
-	 * a DRING_STOPPED is received from the consumer. The dr->cons field
-	 * (set up by vnet_ack()) has the value of the next dring index
-	 * that has not yet been ack-ed. We send a "start" trigger here
-	 * if, and only if, start_cons is true (reset it afterward). Conversely,
-	 * vnet_ack() should check if the dring corresponding to cons
-	 * is marked READY, but start_cons was false.
-	 * If so, vnet_ack() should send out the missed "start" trigger.
-	 *
-	 * Note that the dma_wmb() above makes sure the cookies et al. are
-	 * not globally visible before the VIO_DESC_READY, and that the
-	 * stores are ordered correctly by the compiler. The consumer will
-	 * not proceed until the VIO_DESC_READY is visible assuring that
-	 * the consumer does not observe anything related to descriptors
-	 * out of order. The HV trap from the LDC start trigger is the
-	 * producer to consumer announcement that work is available to the
-	 * consumer
-	 */
-	if (!port->start_cons) { /* previous trigger suffices */
-		trace_vnet_skip_tx_trigger(port->vio._local_sid,
-					   port->vio._peer_sid, dr->cons);
-		goto ldc_start_done;
-	}
-
-	err = __vnet_tx_trigger(port, dr->cons);
-	if (unlikely(err < 0)) {
-		netdev_info(dev, "TX trigger error %d\n", err);
-		d->hdr.state = VIO_DESC_FREE;
-		skb = port->tx_bufs[txi].skb;
-		port->tx_bufs[txi].skb = NULL;
-		dev->stats.tx_carrier_errors++;
-		goto out_dropped;
-	}
-
-ldc_start_done:
-	port->start_cons = false;
-
-	dev->stats.tx_packets++;
-	dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
-
-	dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
-	if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
-		netif_tx_stop_queue(txq);
-		if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
-			netif_tx_wake_queue(txq);
-	}
-
-	(void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
-	rcu_read_unlock();
-
-	vnet_free_skbs(freeskbs);
-
-	return NETDEV_TX_OK;
-
-out_dropped:
-	if (pending)
-		(void)mod_timer(&port->clean_timer,
-				jiffies + VNET_CLEAN_TIMEOUT);
-	else if (port)
-		del_timer(&port->clean_timer);
-	if (port)
-		rcu_read_unlock();
-	if (skb)
-		dev_kfree_skb(skb);
-	vnet_free_skbs(freeskbs);
-	dev->stats.tx_dropped++;
-	return NETDEV_TX_OK;
-}
-
-static void vnet_tx_timeout(struct net_device *dev)
-{
-	/* XXX Implement me XXX */
-}
-
-static int vnet_open(struct net_device *dev)
-{
-	netif_carrier_on(dev);
-	netif_tx_start_all_queues(dev);
-
-	return 0;
-}
-
-static int vnet_close(struct net_device *dev)
-{
-	netif_tx_stop_all_queues(dev);
-	netif_carrier_off(dev);
-
-	return 0;
-}
-
-static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
-{
-	struct vnet_mcast_entry *m;
-
-	for (m = vp->mcast_list; m; m = m->next) {
-		if (ether_addr_equal(m->addr, addr))
-			return m;
-	}
-	return NULL;
-}
-
-static void __update_mc_list(struct vnet *vp, struct net_device *dev)
-{
-	struct netdev_hw_addr *ha;
-
-	netdev_for_each_mc_addr(ha, dev) {
-		struct vnet_mcast_entry *m;
-
-		m = __vnet_mc_find(vp, ha->addr);
-		if (m) {
-			m->hit = 1;
-			continue;
-		}
-
-		if (!m) {
-			m = kzalloc(sizeof(*m), GFP_ATOMIC);
-			if (!m)
-				continue;
-			memcpy(m->addr, ha->addr, ETH_ALEN);
-			m->hit = 1;
-
-			m->next = vp->mcast_list;
-			vp->mcast_list = m;
-		}
-	}
-}
-
-static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
-{
-	struct vio_net_mcast_info info;
-	struct vnet_mcast_entry *m, **pp;
-	int n_addrs;
-
-	memset(&info, 0, sizeof(info));
-
-	info.tag.type = VIO_TYPE_CTRL;
-	info.tag.stype = VIO_SUBTYPE_INFO;
-	info.tag.stype_env = VNET_MCAST_INFO;
-	info.tag.sid = vio_send_sid(&port->vio);
-	info.set = 1;
-
-	n_addrs = 0;
-	for (m = vp->mcast_list; m; m = m->next) {
-		if (m->sent)
-			continue;
-		m->sent = 1;
-		memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
-		       m->addr, ETH_ALEN);
-		if (++n_addrs == VNET_NUM_MCAST) {
-			info.count = n_addrs;
-
-			(void) vio_ldc_send(&port->vio, &info,
-					    sizeof(info));
-			n_addrs = 0;
-		}
-	}
-	if (n_addrs) {
-		info.count = n_addrs;
-		(void) vio_ldc_send(&port->vio, &info, sizeof(info));
-	}
-
-	info.set = 0;
-
-	n_addrs = 0;
-	pp = &vp->mcast_list;
-	while ((m = *pp) != NULL) {
-		if (m->hit) {
-			m->hit = 0;
-			pp = &m->next;
-			continue;
-		}
-
-		memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
-		       m->addr, ETH_ALEN);
-		if (++n_addrs == VNET_NUM_MCAST) {
-			info.count = n_addrs;
-			(void) vio_ldc_send(&port->vio, &info,
-					    sizeof(info));
-			n_addrs = 0;
-		}
-
-		*pp = m->next;
-		kfree(m);
-	}
-	if (n_addrs) {
-		info.count = n_addrs;
-		(void) vio_ldc_send(&port->vio, &info, sizeof(info));
-	}
+	return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find);
 }
 
 static void vnet_set_rx_mode(struct net_device *dev)
 {
 	struct vnet *vp = netdev_priv(dev);
-	struct vnet_port *port;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(port, &vp->port_list, list) {
-
-		if (port->switch_port) {
-			__update_mc_list(vp, dev);
-			__send_mc_list(vp, port);
-			break;
-		}
-	}
-	rcu_read_unlock();
-}
-
-static int vnet_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < 68 || new_mtu > 65535)
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
-static int vnet_set_mac_addr(struct net_device *dev, void *p)
-{
-	return -EINVAL;
-}
-
-static void vnet_get_drvinfo(struct net_device *dev,
-			     struct ethtool_drvinfo *info)
-{
-	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
-	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
-}
-
-static u32 vnet_get_msglevel(struct net_device *dev)
-{
-	struct vnet *vp = netdev_priv(dev);
-	return vp->msg_enable;
-}
-
-static void vnet_set_msglevel(struct net_device *dev, u32 value)
-{
-	struct vnet *vp = netdev_priv(dev);
-	vp->msg_enable = value;
-}
-
-static const struct ethtool_ops vnet_ethtool_ops = {
-	.get_drvinfo		= vnet_get_drvinfo,
-	.get_msglevel		= vnet_get_msglevel,
-	.set_msglevel		= vnet_set_msglevel,
-	.get_link		= ethtool_op_get_link,
-};
-
-static void vnet_port_free_tx_bufs(struct vnet_port *port)
-{
-	struct vio_dring_state *dr;
-	int i;
-
-	dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-
-	if (dr->base == NULL)
-		return;
-
-	for (i = 0; i < VNET_TX_RING_SIZE; i++) {
-		struct vio_net_desc *d;
-		void *skb = port->tx_bufs[i].skb;
-
-		if (!skb)
-			continue;
-
-		d = vio_dring_entry(dr, i);
-
-		ldc_unmap(port->vio.lp,
-			  port->tx_bufs[i].cookies,
-			  port->tx_bufs[i].ncookies);
-		dev_kfree_skb(skb);
-		port->tx_bufs[i].skb = NULL;
-		d->hdr.state = VIO_DESC_FREE;
-	}
-	ldc_free_exp_dring(port->vio.lp, dr->base,
-			   (dr->entry_size * dr->num_entries),
-			   dr->cookies, dr->ncookies);
-	dr->base = NULL;
-	dr->entry_size = 0;
-	dr->num_entries = 0;
-	dr->pending = 0;
-	dr->ncookies = 0;
-}
-
-static void vnet_port_reset(struct vnet_port *port)
-{
-	del_timer(&port->clean_timer);
-	vnet_port_free_tx_bufs(port);
-	port->rmtu = 0;
-	port->tso = true;
-	port->tsolen = 0;
-}
-
-static int vnet_port_alloc_tx_ring(struct vnet_port *port)
-{
-	struct vio_dring_state *dr;
-	unsigned long len, elen;
-	int i, err, ncookies;
-	void *dring;
-
-	dr = &port->vio.drings[VIO_DRIVER_TX_RING];
-
-	elen = sizeof(struct vio_net_desc) +
-	       sizeof(struct ldc_trans_cookie) * 2;
-	if (vio_version_after_eq(&port->vio, 1, 7))
-		elen += sizeof(struct vio_net_dext);
-	len = VNET_TX_RING_SIZE * elen;
-
-	ncookies = VIO_MAX_RING_COOKIES;
-	dring = ldc_alloc_exp_dring(port->vio.lp, len,
-				    dr->cookies, &ncookies,
-				    (LDC_MAP_SHADOW |
-				     LDC_MAP_DIRECT |
-				     LDC_MAP_RW));
-	if (IS_ERR(dring)) {
-		err = PTR_ERR(dring);
-		goto err_out;
-	}
-
-	dr->base = dring;
-	dr->entry_size = elen;
-	dr->num_entries = VNET_TX_RING_SIZE;
-	dr->prod = dr->cons = 0;
-	port->start_cons  = true; /* need an initial trigger */
-	dr->pending = VNET_TX_RING_SIZE;
-	dr->ncookies = ncookies;
-
-	for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
-		struct vio_net_desc *d;
 
-		d = vio_dring_entry(dr, i);
-		d->hdr.state = VIO_DESC_FREE;
-	}
-	return 0;
-
-err_out:
-	vnet_port_free_tx_bufs(port);
-
-	return err;
+	return sunvnet_set_rx_mode_common(dev, vp);
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void vnet_poll_controller(struct net_device *dev)
 {
 	struct vnet *vp = netdev_priv(dev);
-	struct vnet_port *port;
-	unsigned long flags;
 
-	spin_lock_irqsave(&vp->lock, flags);
-	if (!list_empty(&vp->port_list)) {
-		port = list_entry(vp->port_list.next, struct vnet_port, list);
-		napi_schedule(&port->napi);
-	}
-	spin_unlock_irqrestore(&vp->lock, flags);
+	return sunvnet_poll_controller_common(dev, vp);
 }
 #endif
-static LIST_HEAD(vnet_list);
-static DEFINE_MUTEX(vnet_list_mutex);
 
 static const struct net_device_ops vnet_ops = {
-	.ndo_open		= vnet_open,
-	.ndo_stop		= vnet_close,
+	.ndo_open		= sunvnet_open_common,
+	.ndo_stop		= sunvnet_close_common,
 	.ndo_set_rx_mode	= vnet_set_rx_mode,
-	.ndo_set_mac_address	= vnet_set_mac_addr,
+	.ndo_set_mac_address	= sunvnet_set_mac_addr_common,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_tx_timeout		= vnet_tx_timeout,
-	.ndo_change_mtu		= vnet_change_mtu,
+	.ndo_tx_timeout		= sunvnet_tx_timeout_common,
+	.ndo_change_mtu		= sunvnet_change_mtu_common,
 	.ndo_start_xmit		= vnet_start_xmit,
 	.ndo_select_queue	= vnet_select_queue,
 #ifdef CONFIG_NET_POLL_CONTROLLER
@@ -1908,15 +289,15 @@ static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
 }
 
 static struct ldc_channel_config vnet_ldc_cfg = {
-	.event		= vnet_event,
+	.event		= sunvnet_event_common,
 	.mtu		= 64,
 	.mode		= LDC_MODE_UNRELIABLE,
 };
 
 static struct vio_driver_ops vnet_vio_ops = {
-	.send_attr		= vnet_send_attr,
-	.handle_attr		= vnet_handle_attr,
-	.handshake_complete	= vnet_handshake_complete,
+	.send_attr		= sunvnet_send_attr_common,
+	.handle_attr		= sunvnet_handle_attr_common,
+	.handshake_complete	= sunvnet_handshake_complete_common,
 };
 
 static void print_version(void)
@@ -1926,25 +307,6 @@ static void print_version(void)
 
 const char *remote_macaddr_prop = "remote-mac-address";
 
-static void
-vnet_port_add_txq(struct vnet_port *port)
-{
-	struct vnet *vp = port->vp;
-	int n;
-
-	n = vp->nports++;
-	n = n & (VNET_MAX_TXQS - 1);
-	port->q_index = n;
-	netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
-}
-
-static void
-vnet_port_rm_txq(struct vnet_port *port)
-{
-	port->vp->nports--;
-	netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
-}
-
 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 {
 	struct mdesc_handle *hp;
@@ -1992,13 +354,14 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	if (err)
 		goto err_out_free_port;
 
-	netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT);
+	netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common,
+		       NAPI_POLL_WEIGHT);
 
 	INIT_HLIST_NODE(&port->hash);
 	INIT_LIST_HEAD(&port->list);
 
 	switch_port = 0;
-	if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
+	if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL))
 		switch_port = 1;
 	port->switch_port = switch_port;
 	port->tso = true;
@@ -2011,7 +374,7 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 		list_add_tail_rcu(&port->list, &vp->port_list);
 	hlist_add_head_rcu(&port->hash,
 			   &vp->port_hash[vnet_hashfn(port->raddr)]);
-	vnet_port_add_txq(port);
+	sunvnet_port_add_txq_common(port);
 	spin_unlock_irqrestore(&vp->lock, flags);
 
 	dev_set_drvdata(&vdev->dev, port);
@@ -2019,7 +382,7 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	pr_info("%s: PORT ( remote-mac %pM%s )\n",
 		vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
 
-	setup_timer(&port->clean_timer, vnet_clean_timer_expire,
+	setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
 		    (unsigned long)port);
 
 	napi_enable(&port->napi);
@@ -2042,7 +405,6 @@ static int vnet_port_remove(struct vio_dev *vdev)
 	struct vnet_port *port = dev_get_drvdata(&vdev->dev);
 
 	if (port) {
-
 		del_timer_sync(&port->vio.timer);
 
 		napi_disable(&port->napi);
@@ -2052,15 +414,14 @@ static int vnet_port_remove(struct vio_dev *vdev)
 
 		synchronize_rcu();
 		del_timer_sync(&port->clean_timer);
-		vnet_port_rm_txq(port);
+		sunvnet_port_rm_txq_common(port);
 		netif_napi_del(&port->napi);
-		vnet_port_free_tx_bufs(port);
+		sunvnet_port_free_tx_bufs_common(port);
 		vio_ldc_free(&port->vio);
 
 		dev_set_drvdata(&vdev->dev, NULL);
 
 		kfree(port);
-
 	}
 	return 0;
 }

drivers/net/ethernet/sun/sunvnet_common.c

+/* sunvnet.c: Sun LDOM Virtual Network Driver.
+ *
+ * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
+ * Copyright (C) 2016 Oracle. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+#include <linux/mutex.h>
+#include <linux/highmem.h>
+#include <linux/if_vlan.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/sunvnet.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <linux/icmpv6.h>
+#endif
+
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/route.h>
+
+#include <asm/vio.h>
+#include <asm/ldc.h>
+
+#include "sunvnet_common.h"
+
+/* Heuristic for the number of times to exponentially backoff and
+ * retry sending an LDC trigger when EAGAIN is encountered
+ */
+#define	VNET_MAX_RETRIES	10
+
+static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
+static void vnet_port_reset(struct vnet_port *port);
+
+static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
+{
+	return vio_dring_avail(dr, VNET_TX_RING_SIZE);
+}
+
+static int vnet_handle_unknown(struct vnet_port *port, void *arg)
+{
+	struct vio_msg_tag *pkt = arg;
+
+	pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
+	       pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
+	pr_err("Resetting connection\n");
+
+	ldc_disconnect(port->vio.lp);
+
+	return -ECONNRESET;
+}
+
+static int vnet_port_alloc_tx_ring(struct vnet_port *port);
+
+int sunvnet_send_attr_common(struct vio_driver_state *vio)
+{
+	struct vnet_port *port = to_vnet_port(vio);
+	struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
+	struct vio_net_attr_info pkt;
+	int framelen = ETH_FRAME_LEN;
+	int i, err;
+
+	err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
+	if (err)
+		return err;
+
+	memset(&pkt, 0, sizeof(pkt));
+	pkt.tag.type = VIO_TYPE_CTRL;
+	pkt.tag.stype = VIO_SUBTYPE_INFO;
+	pkt.tag.stype_env = VIO_ATTR_INFO;
+	pkt.tag.sid = vio_send_sid(vio);
+	if (vio_version_before(vio, 1, 2))
+		pkt.xfer_mode = VIO_DRING_MODE;
+	else
+		pkt.xfer_mode = VIO_NEW_DRING_MODE;
+	pkt.addr_type = VNET_ADDR_ETHERMAC;
+	pkt.ack_freq = 0;
+	for (i = 0; i < 6; i++)
+		pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
+	if (vio_version_after(vio, 1, 3)) {
+		if (port->rmtu) {
+			port->rmtu = min(VNET_MAXPACKET, port->rmtu);
+			pkt.mtu = port->rmtu;
+		} else {
+			port->rmtu = VNET_MAXPACKET;
+			pkt.mtu = port->rmtu;
+		}
+		if (vio_version_after_eq(vio, 1, 6))
+			pkt.options = VIO_TX_DRING;
+	} else if (vio_version_before(vio, 1, 3)) {
+		pkt.mtu = framelen;
+	} else { /* v1.3 */
+		pkt.mtu = framelen + VLAN_HLEN;
+	}
+
+	pkt.cflags = 0;
+	if (vio_version_after_eq(vio, 1, 7) && port->tso) {
+		pkt.cflags |= VNET_LSO_IPV4_CAPAB;
+		if (!port->tsolen)
+			port->tsolen = VNET_MAXTSO;
+		pkt.ipv4_lso_maxlen = port->tsolen;
+	}
+
+	pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
+
+	viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
+	       "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
+	       "cflags[0x%04x] lso_max[%u]\n",
+	       pkt.xfer_mode, pkt.addr_type,
+	       (unsigned long long)pkt.addr,
+	       pkt.ack_freq, pkt.plnk_updt, pkt.options,
+	       (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
+
+	return vio_ldc_send(vio, &pkt, sizeof(pkt));
+}
+EXPORT_SYMBOL_GPL(sunvnet_send_attr_common);
+
+static int handle_attr_info(struct vio_driver_state *vio,
+			    struct vio_net_attr_info *pkt)
+{
+	struct vnet_port *port = to_vnet_port(vio);
+	u64	localmtu;
+	u8	xfer_mode;
+
+	viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
+	       "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
+	       " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
+	       pkt->xfer_mode, pkt->addr_type,
+	       (unsigned long long)pkt->addr,
+	       pkt->ack_freq, pkt->plnk_updt, pkt->options,
+	       (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
+	       pkt->ipv4_lso_maxlen);
+
+	pkt->tag.sid = vio_send_sid(vio);
+
+	xfer_mode = pkt->xfer_mode;
+	/* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
+	if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
+		xfer_mode = VIO_NEW_DRING_MODE;
+
+	/* MTU negotiation:
+	 *	< v1.3 - ETH_FRAME_LEN exactly
+	 *	> v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
+	 *			pkt->mtu for ACK
+	 *	= v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
+	 */
+	if (vio_version_before(vio, 1, 3)) {
+		localmtu = ETH_FRAME_LEN;
+	} else if (vio_version_after(vio, 1, 3)) {
+		localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
+		localmtu = min(pkt->mtu, localmtu);
+		pkt->mtu = localmtu;
+	} else { /* v1.3 */
+		localmtu = ETH_FRAME_LEN + VLAN_HLEN;
+	}
+	port->rmtu = localmtu;
+
+	/* LSO negotiation */
+	if (vio_version_after_eq(vio, 1, 7))
+		port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
+	else
+		port->tso = false;
+	if (port->tso) {
+		if (!port->tsolen)
+			port->tsolen = VNET_MAXTSO;
+		port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
+		if (port->tsolen < VNET_MINTSO) {
+			port->tso = false;
+			port->tsolen = 0;
+			pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
+		}
+		pkt->ipv4_lso_maxlen = port->tsolen;
+	} else {
+		pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
+		pkt->ipv4_lso_maxlen = 0;
+	}
+
+	/* for version >= 1.6, ACK packet mode we support */
+	if (vio_version_after_eq(vio, 1, 6)) {
+		pkt->xfer_mode = VIO_NEW_DRING_MODE;
+		pkt->options = VIO_TX_DRING;
+	}
+
+	if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
+	    pkt->addr_type != VNET_ADDR_ETHERMAC ||
+	    pkt->mtu != localmtu) {
+		viodbg(HS, "SEND NET ATTR NACK\n");
+
+		pkt->tag.stype = VIO_SUBTYPE_NACK;
+
+		(void)vio_ldc_send(vio, pkt, sizeof(*pkt));
+
+		return -ECONNRESET;
+	}
+
+	viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
+	       "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
+	       "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
+	       pkt->xfer_mode, pkt->addr_type,
+	       (unsigned long long)pkt->addr,
+	       pkt->ack_freq, pkt->plnk_updt, pkt->options,
+	       (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
+	       pkt->ipv4_lso_maxlen);
+
+	pkt->tag.stype = VIO_SUBTYPE_ACK;
+
+	return vio_ldc_send(vio, pkt, sizeof(*pkt));
+}
+
+static int handle_attr_ack(struct vio_driver_state *vio,
+			   struct vio_net_attr_info *pkt)
+{
+	viodbg(HS, "GOT NET ATTR ACK\n");
+
+	return 0;
+}
+
+static int handle_attr_nack(struct vio_driver_state *vio,
+			    struct vio_net_attr_info *pkt)
+{
+	viodbg(HS, "GOT NET ATTR NACK\n");
+
+	return -ECONNRESET;
+}
+
+int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg)
+{
+	struct vio_net_attr_info *pkt = arg;
+
+	switch (pkt->tag.stype) {
+	case VIO_SUBTYPE_INFO:
+		return handle_attr_info(vio, pkt);
+
+	case VIO_SUBTYPE_ACK:
+		return handle_attr_ack(vio, pkt);
+
+	case VIO_SUBTYPE_NACK:
+		return handle_attr_nack(vio, pkt);
+
+	default:
+		return -ECONNRESET;
+	}
+}
+EXPORT_SYMBOL_GPL(sunvnet_handle_attr_common);
+
+void sunvnet_handshake_complete_common(struct vio_driver_state *vio)
+{
+	struct vio_dring_state *dr;
+
+	dr = &vio->drings[VIO_DRIVER_RX_RING];
+	dr->rcv_nxt = 1;
+	dr->snd_nxt = 1;
+
+	dr = &vio->drings[VIO_DRIVER_TX_RING];
+	dr->rcv_nxt = 1;
+	dr->snd_nxt = 1;
+}
+EXPORT_SYMBOL_GPL(sunvnet_handshake_complete_common);
+
+/* The hypervisor interface that implements copying to/from imported
+ * memory from another domain requires that copies are done to 8-byte
+ * aligned buffers, and that the lengths of such copies are also 8-byte
+ * multiples.
+ *
+ * So we align skb->data to an 8-byte multiple and pad-out the data
+ * area so we can round the copy length up to the next multiple of
+ * 8 for the copy.
+ *
+ * The transmitter puts the actual start of the packet 6 bytes into
+ * the buffer it sends over, so that the IP headers after the ethernet
+ * header are aligned properly.  These 6 bytes are not in the descriptor
+ * length, they are simply implied.  This offset is represented using
+ * the VNET_PACKET_SKIP macro.
+ */
+static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
+					   unsigned int len)
+{
+	struct sk_buff *skb;
+	unsigned long addr, off;
+
+	skb = netdev_alloc_skb(dev, len + VNET_PACKET_SKIP + 8 + 8);
+	if (unlikely(!skb))
+		return NULL;
+
+	addr = (unsigned long)skb->data;
+	off = ((addr + 7UL) & ~7UL) - addr;
+	if (off)
+		skb_reserve(skb, off);
+
+	return skb;
+}
+
+static inline void vnet_fullcsum(struct sk_buff *skb)
+{
+	struct iphdr *iph = ip_hdr(skb);
+	int offset = skb_transport_offset(skb);
+
+	if (skb->protocol != htons(ETH_P_IP))
+		return;
+	if (iph->protocol != IPPROTO_TCP &&
+	    iph->protocol != IPPROTO_UDP)
+		return;
+	skb->ip_summed = CHECKSUM_NONE;
+	skb->csum_level = 1;
+	skb->csum = 0;
+	if (iph->protocol == IPPROTO_TCP) {
+		struct tcphdr *ptcp = tcp_hdr(skb);
+
+		ptcp->check = 0;
+		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+		ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+						skb->len - offset, IPPROTO_TCP,
+						skb->csum);
+	} else if (iph->protocol == IPPROTO_UDP) {
+		struct udphdr *pudp = udp_hdr(skb);
+
+		pudp->check = 0;
+		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+		pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+						skb->len - offset, IPPROTO_UDP,
+						skb->csum);
+	}
+}
+
+static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
+{
+	struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
+	unsigned int len = desc->size;
+	unsigned int copy_len;
+	struct sk_buff *skb;
+	int maxlen;
+	int err;
+
+	err = -EMSGSIZE;
+	if (port->tso && port->tsolen > port->rmtu)
+		maxlen = port->tsolen;
+	else
+		maxlen = port->rmtu;
+	if (unlikely(len < ETH_ZLEN || len > maxlen)) {
+		dev->stats.rx_length_errors++;
+		goto out_dropped;
+	}
+
+	skb = alloc_and_align_skb(dev, len);
+	err = -ENOMEM;
+	if (unlikely(!skb)) {
+		dev->stats.rx_missed_errors++;
+		goto out_dropped;
+	}
+
+	copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
+	skb_put(skb, copy_len);
+	err = ldc_copy(port->vio.lp, LDC_COPY_IN,
+		       skb->data, copy_len, 0,
+		       desc->cookies, desc->ncookies);
+	if (unlikely(err < 0)) {
+		dev->stats.rx_frame_errors++;
+		goto out_free_skb;
+	}
+
+	skb_pull(skb, VNET_PACKET_SKIP);
+	skb_trim(skb, len);
+	skb->protocol = eth_type_trans(skb, dev);
+
+	if (vio_version_after_eq(&port->vio, 1, 8)) {
+		struct vio_net_dext *dext = vio_net_ext(desc);
+
+		skb_reset_network_header(skb);
+
+		if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
+			if (skb->protocol == ETH_P_IP) {
+				struct iphdr *iph = ip_hdr(skb);
+
+				iph->check = 0;
+				ip_send_check(iph);
+			}
+		}
+		if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
+		    skb->ip_summed == CHECKSUM_NONE) {
+			if (skb->protocol == htons(ETH_P_IP)) {
+				struct iphdr *iph = ip_hdr(skb);
+				int ihl = iph->ihl * 4;
+
+				skb_reset_transport_header(skb);
+				skb_set_transport_header(skb, ihl);
+				vnet_fullcsum(skb);
+			}
+		}
+		if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
+			skb->ip_summed = CHECKSUM_PARTIAL;
+			skb->csum_level = 0;
+			if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
+				skb->csum_level = 1;
+		}
+	}
+
+	skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
+
+	dev->stats.rx_packets++;
+	dev->stats.rx_bytes += len;
+	napi_gro_receive(&port->napi, skb);
+	return 0;
+
+out_free_skb:
+	kfree_skb(skb);
+
+out_dropped:
+	dev->stats.rx_dropped++;
+	return err;
+}
+
+static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
+			 u32 start, u32 end, u8 vio_dring_state)
+{
+	struct vio_dring_data hdr = {
+		.tag = {
+			.type		= VIO_TYPE_DATA,
+			.stype		= VIO_SUBTYPE_ACK,
+			.stype_env	= VIO_DRING_DATA,
+			.sid		= vio_send_sid(&port->vio),
+		},
+		.dring_ident		= dr->ident,
+		.start_idx		= start,
+		.end_idx		= end,
+		.state			= vio_dring_state,
+	};
+	int err, delay;
+	int retries = 0;
+
+	hdr.seq = dr->snd_nxt;
+	delay = 1;
+	do {
+		err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
+		if (err > 0) {
+			dr->snd_nxt++;
+			break;
+		}
+		udelay(delay);
+		if ((delay <<= 1) > 128)
+			delay = 128;
+		if (retries++ > VNET_MAX_RETRIES) {
+			pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
+				port->raddr[0], port->raddr[1],
+				port->raddr[2], port->raddr[3],
+				port->raddr[4], port->raddr[5]);
+			break;
+		}
+	} while (err == -EAGAIN);
+
+	if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
+		port->stop_rx_idx = end;
+		port->stop_rx = true;
+	} else {
+		port->stop_rx_idx = 0;
+		port->stop_rx = false;
+	}
+
+	return err;
+}
+
+static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
+					struct vio_dring_state *dr,
+					u32 index)
+{
+	struct vio_net_desc *desc = port->vio.desc_buf;
+	int err;
+
+	err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
+				  (index * dr->entry_size),
+				  dr->cookies, dr->ncookies);
+	if (err < 0)
+		return ERR_PTR(err);
+
+	return desc;
+}
+
+static int put_rx_desc(struct vnet_port *port,
+		       struct vio_dring_state *dr,
+		       struct vio_net_desc *desc,
+		       u32 index)
+{
+	int err;
+
+	err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
+				  (index * dr->entry_size),
+				  dr->cookies, dr->ncookies);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+static int vnet_walk_rx_one(struct vnet_port *port,
+			    struct vio_dring_state *dr,
+			    u32 index, int *needs_ack)
+{
+	struct vio_net_desc *desc = get_rx_desc(port, dr, index);
+	struct vio_driver_state *vio = &port->vio;
+	int err;
+
+	BUG_ON(!desc);
+	if (IS_ERR(desc))
+		return PTR_ERR(desc);
+
+	if (desc->hdr.state != VIO_DESC_READY)
+		return 1;
+
+	dma_rmb();
+
+	viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
+	       desc->hdr.state, desc->hdr.ack,
+	       desc->size, desc->ncookies,
+	       desc->cookies[0].cookie_addr,
+	       desc->cookies[0].cookie_size);
+
+	err = vnet_rx_one(port, desc);
+	if (err == -ECONNRESET)
+		return err;
+	trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid,
+			  index, desc->hdr.ack);
+	desc->hdr.state = VIO_DESC_DONE;
+	err = put_rx_desc(port, dr, desc, index);
+	if (err < 0)
+		return err;
+	*needs_ack = desc->hdr.ack;
+	return 0;
+}
+
+static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
+			u32 start, u32 end, int *npkts, int budget)
+{
+	struct vio_driver_state *vio = &port->vio;
+	int ack_start = -1, ack_end = -1;
+	bool send_ack = true;
+
+	end = (end == (u32)-1) ? vio_dring_prev(dr, start)
+			       : vio_dring_next(dr, end);
+
+	viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
+
+	while (start != end) {
+		int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
+
+		if (err == -ECONNRESET)
+			return err;
+		if (err != 0)
+			break;
+		(*npkts)++;
+		if (ack_start == -1)
+			ack_start = start;
+		ack_end = start;
+		start = vio_dring_next(dr, start);
+		if (ack && start != end) {
+			err = vnet_send_ack(port, dr, ack_start, ack_end,
+					    VIO_DRING_ACTIVE);
+			if (err == -ECONNRESET)
+				return err;
+			ack_start = -1;
+		}
+		if ((*npkts) >= budget) {
+			send_ack = false;
+			break;
+		}
+	}
+	if (unlikely(ack_start == -1)) {
+		ack_end = vio_dring_prev(dr, start);
+		ack_start = ack_end;
+	}
+	if (send_ack) {
+		port->napi_resume = false;
+		trace_vnet_tx_send_stopped_ack(port->vio._local_sid,
+					       port->vio._peer_sid,
+					       ack_end, *npkts);
+		return vnet_send_ack(port, dr, ack_start, ack_end,
+				     VIO_DRING_STOPPED);
+	} else  {
+		trace_vnet_tx_defer_stopped_ack(port->vio._local_sid,
+						port->vio._peer_sid,
+						ack_end, *npkts);
+		port->napi_resume = true;
+		port->napi_stop_idx = ack_end;
+		return 1;
+	}
+}
+
+static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
+		   int budget)
+{
+	struct vio_dring_data *pkt = msgbuf;
+	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
+	struct vio_driver_state *vio = &port->vio;
+
+	viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
+	       pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
+
+	if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
+		return 0;
+	if (unlikely(pkt->seq != dr->rcv_nxt)) {
+		pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
+		       pkt->seq, dr->rcv_nxt);
+		return 0;
+	}
+
+	if (!port->napi_resume)
+		dr->rcv_nxt++;
+
+	/* XXX Validate pkt->start_idx and pkt->end_idx XXX */
+
+	return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
+			    npkts, budget);
+}
+
+static int idx_is_pending(struct vio_dring_state *dr, u32 end)
+{
+	u32 idx = dr->cons;
+	int found = 0;
+
+	while (idx != dr->prod) {
+		if (idx == end) {
+			found = 1;
+			break;
+		}
+		idx = vio_dring_next(dr, idx);
+	}
+	return found;
+}
+
+static int vnet_ack(struct vnet_port *port, void *msgbuf)
+{
+	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+	struct vio_dring_data *pkt = msgbuf;
+	struct net_device *dev;
+	u32 end;
+	struct vio_net_desc *desc;
+	struct netdev_queue *txq;
+
+	if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
+		return 0;
+
+	end = pkt->end_idx;
+	dev = VNET_PORT_TO_NET_DEVICE(port);
+	netif_tx_lock(dev);
+	if (unlikely(!idx_is_pending(dr, end))) {
+		netif_tx_unlock(dev);
+		return 0;
+	}
+
+	/* sync for race conditions with vnet_start_xmit() and tell xmit it
+	 * is time to send a trigger.
+	 */
+	trace_vnet_rx_stopped_ack(port->vio._local_sid,
+				  port->vio._peer_sid, end);
+	dr->cons = vio_dring_next(dr, end);
+	desc = vio_dring_entry(dr, dr->cons);
+	if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
+		/* vnet_start_xmit() just populated this dring but missed
+		 * sending the "start" LDC message to the consumer.
+		 * Send a "start" trigger on its behalf.
+		 */
+		if (__vnet_tx_trigger(port, dr->cons) > 0)
+			port->start_cons = false;
+		else
+			port->start_cons = true;
+	} else {
+		port->start_cons = true;
+	}
+	netif_tx_unlock(dev);
+
+	txq = netdev_get_tx_queue(dev, port->q_index);
+	if (unlikely(netif_tx_queue_stopped(txq) &&
+		     vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
+		return 1;
+
+	return 0;
+}
+
+static int vnet_nack(struct vnet_port *port, void *msgbuf)
+{
+	/* XXX just reset or similar XXX */
+	return 0;
+}
+
+static int handle_mcast(struct vnet_port *port, void *msgbuf)
+{
+	struct vio_net_mcast_info *pkt = msgbuf;
+	struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
+
+	if (pkt->tag.stype != VIO_SUBTYPE_ACK)
+		pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
+		       dev->name,
+		       pkt->tag.type,
+		       pkt->tag.stype,
+		       pkt->tag.stype_env,
+		       pkt->tag.sid);
+
+	return 0;
+}
+
+/* Got back a STOPPED LDC message on port. If the queue is stopped,
+ * wake it up so that we'll send out another START message at the
+ * next TX.
+ */
+static void maybe_tx_wakeup(struct vnet_port *port)
+{
+	struct netdev_queue *txq;
+
+	txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
+				  port->q_index);
+	__netif_tx_lock(txq, smp_processor_id());
+	if (likely(netif_tx_queue_stopped(txq))) {
+		struct vio_dring_state *dr;
+
+		dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+		netif_tx_wake_queue(txq);
+	}
+	__netif_tx_unlock(txq);
+}
+
+bool sunvnet_port_is_up_common(struct vnet_port *vnet)
+{
+	struct vio_driver_state *vio = &vnet->vio;
+
+	return !!(vio->hs_state & VIO_HS_COMPLETE);
+}
+EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common);
+
+static int vnet_event_napi(struct vnet_port *port, int budget)
+{
+	struct vio_driver_state *vio = &port->vio;
+	int tx_wakeup, err;
+	int npkts = 0;
+	int event = (port->rx_event & LDC_EVENT_RESET);
+
+ldc_ctrl:
+	if (unlikely(event == LDC_EVENT_RESET ||
+		     event == LDC_EVENT_UP)) {
+		vio_link_state_change(vio, event);
+
+		if (event == LDC_EVENT_RESET) {
+			vnet_port_reset(port);
+			vio_port_up(vio);
+		}
+		port->rx_event = 0;
+		return 0;
+	}
+	/* We may have multiple LDC events in rx_event. Unroll send_events() */
+	event = (port->rx_event & LDC_EVENT_UP);
+	port->rx_event &= ~(LDC_EVENT_RESET | LDC_EVENT_UP);
+	if (event == LDC_EVENT_UP)
+		goto ldc_ctrl;
+	event = port->rx_event;
+	if (!(event & LDC_EVENT_DATA_READY))
+		return 0;
+
+	/* we dont expect any other bits than RESET, UP, DATA_READY */
+	BUG_ON(event != LDC_EVENT_DATA_READY);
+
+	err = 0;
+	tx_wakeup = 0;
+	while (1) {
+		union {
+			struct vio_msg_tag tag;
+			u64 raw[8];
+		} msgbuf;
+
+		if (port->napi_resume) {
+			struct vio_dring_data *pkt =
+				(struct vio_dring_data *)&msgbuf;
+			struct vio_dring_state *dr =
+				&port->vio.drings[VIO_DRIVER_RX_RING];
+
+			pkt->tag.type = VIO_TYPE_DATA;
+			pkt->tag.stype = VIO_SUBTYPE_INFO;
+			pkt->tag.stype_env = VIO_DRING_DATA;
+			pkt->seq = dr->rcv_nxt;
+			pkt->start_idx = vio_dring_next(dr,
+							port->napi_stop_idx);
+			pkt->end_idx = -1;
+			goto napi_resume;
+		}
+		err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
+		if (unlikely(err < 0)) {
+			if (err == -ECONNRESET)
+				vio_conn_reset(vio);
+			break;
+		}
+		if (err == 0)
+			break;
+		viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
+		       msgbuf.tag.type,
+		       msgbuf.tag.stype,
+		       msgbuf.tag.stype_env,
+		       msgbuf.tag.sid);
+		err = vio_validate_sid(vio, &msgbuf.tag);
+		if (err < 0)
+			break;
+napi_resume:
+		if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
+			if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
+				if (!sunvnet_port_is_up_common(port)) {
+					/* failures like handshake_failure()
+					 * may have cleaned up dring, but
+					 * NAPI polling may bring us here.
+					 */
+					err = -ECONNRESET;
+					break;
+				}
+				err = vnet_rx(port, &msgbuf, &npkts, budget);
+				if (npkts >= budget)
+					break;
+				if (npkts == 0)
+					break;
+			} else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
+				err = vnet_ack(port, &msgbuf);
+				if (err > 0)
+					tx_wakeup |= err;
+			} else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
+				err = vnet_nack(port, &msgbuf);
+			}
+		} else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
+			if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
+				err = handle_mcast(port, &msgbuf);
+			else
+				err = vio_control_pkt_engine(vio, &msgbuf);
+			if (err)
+				break;
+		} else {
+			err = vnet_handle_unknown(port, &msgbuf);
+		}
+		if (err == -ECONNRESET)
+			break;
+	}
+	if (unlikely(tx_wakeup && err != -ECONNRESET))
+		maybe_tx_wakeup(port);
+	return npkts;
+}
+
+int sunvnet_poll_common(struct napi_struct *napi, int budget)
+{
+	struct vnet_port *port = container_of(napi, struct vnet_port, napi);
+	struct vio_driver_state *vio = &port->vio;
+	int processed = vnet_event_napi(port, budget);
+
+	if (processed < budget) {
+		napi_complete(napi);
+		port->rx_event &= ~LDC_EVENT_DATA_READY;
+		vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
+	}
+	return processed;
+}
+EXPORT_SYMBOL_GPL(sunvnet_poll_common);
+
+void sunvnet_event_common(void *arg, int event)
+{
+	struct vnet_port *port = arg;
+	struct vio_driver_state *vio = &port->vio;
+
+	port->rx_event |= event;
+	vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
+	napi_schedule(&port->napi);
+}
+EXPORT_SYMBOL_GPL(sunvnet_event_common);
+
+static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
+{
+	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+	struct vio_dring_data hdr = {
+		.tag = {
+			.type		= VIO_TYPE_DATA,
+			.stype		= VIO_SUBTYPE_INFO,
+			.stype_env	= VIO_DRING_DATA,
+			.sid		= vio_send_sid(&port->vio),
+		},
+		.dring_ident		= dr->ident,
+		.start_idx		= start,
+		.end_idx		= (u32)-1,
+	};
+	int err, delay;
+	int retries = 0;
+
+	if (port->stop_rx) {
+		trace_vnet_tx_pending_stopped_ack(port->vio._local_sid,
+						  port->vio._peer_sid,
+						  port->stop_rx_idx, -1);
+		err = vnet_send_ack(port,
+				    &port->vio.drings[VIO_DRIVER_RX_RING],
+				    port->stop_rx_idx, -1,
+				    VIO_DRING_STOPPED);
+		if (err <= 0)
+			return err;
+	}
+
+	hdr.seq = dr->snd_nxt;
+	delay = 1;
+	do {
+		err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
+		if (err > 0) {
+			dr->snd_nxt++;
+			break;
+		}
+		udelay(delay);
+		if ((delay <<= 1) > 128)
+			delay = 128;
+		if (retries++ > VNET_MAX_RETRIES)
+			break;
+	} while (err == -EAGAIN);
+	trace_vnet_tx_trigger(port->vio._local_sid,
+			      port->vio._peer_sid, start, err);
+
+	return err;
+}
+
+static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
+					  unsigned *pending)
+{
+	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+	struct sk_buff *skb = NULL;
+	int i, txi;
+
+	*pending = 0;
+
+	txi = dr->prod;
+	for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
+		struct vio_net_desc *d;
+
+		--txi;
+		if (txi < 0)
+			txi = VNET_TX_RING_SIZE - 1;
+
+		d = vio_dring_entry(dr, txi);
+
+		if (d->hdr.state == VIO_DESC_READY) {
+			(*pending)++;
+			continue;
+		}
+		if (port->tx_bufs[txi].skb) {
+			if (d->hdr.state != VIO_DESC_DONE)
+				pr_notice("invalid ring buffer state %d\n",
+					  d->hdr.state);
+			BUG_ON(port->tx_bufs[txi].skb->next);
+
+			port->tx_bufs[txi].skb->next = skb;
+			skb = port->tx_bufs[txi].skb;
+			port->tx_bufs[txi].skb = NULL;
+
+			ldc_unmap(port->vio.lp,
+				  port->tx_bufs[txi].cookies,
+				  port->tx_bufs[txi].ncookies);
+		} else if (d->hdr.state == VIO_DESC_FREE) {
+			break;
+		}
+		d->hdr.state = VIO_DESC_FREE;
+	}
+	return skb;
+}
+
+static inline void vnet_free_skbs(struct sk_buff *skb)
+{
+	struct sk_buff *next;
+
+	while (skb) {
+		next = skb->next;
+		skb->next = NULL;
+		dev_kfree_skb(skb);
+		skb = next;
+	}
+}
+
+void sunvnet_clean_timer_expire_common(unsigned long port0)
+{
+	struct vnet_port *port = (struct vnet_port *)port0;
+	struct sk_buff *freeskbs;
+	unsigned pending;
+
+	netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port));
+	freeskbs = vnet_clean_tx_ring(port, &pending);
+	netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port));
+
+	vnet_free_skbs(freeskbs);
+
+	if (pending)
+		(void)mod_timer(&port->clean_timer,
+				jiffies + VNET_CLEAN_TIMEOUT);
+	 else
+		del_timer(&port->clean_timer);
+}
+EXPORT_SYMBOL_GPL(sunvnet_clean_timer_expire_common);
+
+static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
+			       struct ldc_trans_cookie *cookies, int ncookies,
+			       unsigned int map_perm)
+{
+	int i, nc, err, blen;
+
+	/* header */
+	blen = skb_headlen(skb);
+	if (blen < ETH_ZLEN)
+		blen = ETH_ZLEN;
+	blen += VNET_PACKET_SKIP;
+	blen += 8 - (blen & 7);
+
+	err = ldc_map_single(lp, skb->data - VNET_PACKET_SKIP, blen, cookies,
+			     ncookies, map_perm);
+	if (err < 0)
+		return err;
+	nc = err;
+
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+		skb_frag_t *f = &skb_shinfo(skb)->frags[i];
+		u8 *vaddr;
+
+		if (nc < ncookies) {
+			vaddr = kmap_atomic(skb_frag_page(f));
+			blen = skb_frag_size(f);
+			blen += 8 - (blen & 7);
+			err = ldc_map_single(lp, vaddr + f->page_offset,
+					     blen, cookies + nc, ncookies - nc,
+					     map_perm);
+			kunmap_atomic(vaddr);
+		} else {
+			err = -EMSGSIZE;
+		}
+
+		if (err < 0) {
+			ldc_unmap(lp, cookies, nc);
+			return err;
+		}
+		nc += err;
+	}
+	return nc;
+}
+
+static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
+{
+	struct sk_buff *nskb;
+	int i, len, pad, docopy;
+
+	len = skb->len;
+	pad = 0;
+	if (len < ETH_ZLEN) {
+		pad += ETH_ZLEN - skb->len;
+		len += pad;
+	}
+	len += VNET_PACKET_SKIP;
+	pad += 8 - (len & 7);
+
+	/* make sure we have enough cookies and alignment in every frag */
+	docopy = skb_shinfo(skb)->nr_frags >= ncookies;
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+		skb_frag_t *f = &skb_shinfo(skb)->frags[i];
+
+		docopy |= f->page_offset & 7;
+	}
+	if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
+	    skb_tailroom(skb) < pad ||
+	    skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
+		int start = 0, offset;
+		__wsum csum;
+
+		len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
+		nskb = alloc_and_align_skb(skb->dev, len);
+		if (!nskb) {
+			dev_kfree_skb(skb);
+			return NULL;
+		}
+		skb_reserve(nskb, VNET_PACKET_SKIP);
+
+		nskb->protocol = skb->protocol;
+		offset = skb_mac_header(skb) - skb->data;
+		skb_set_mac_header(nskb, offset);
+		offset = skb_network_header(skb) - skb->data;
+		skb_set_network_header(nskb, offset);
+		offset = skb_transport_header(skb) - skb->data;
+		skb_set_transport_header(nskb, offset);
+
+		offset = 0;
+		nskb->csum_offset = skb->csum_offset;
+		nskb->ip_summed = skb->ip_summed;
+
+		if (skb->ip_summed == CHECKSUM_PARTIAL)
+			start = skb_checksum_start_offset(skb);
+		if (start) {
+			struct iphdr *iph = ip_hdr(nskb);
+			int offset = start + nskb->csum_offset;
+
+			if (skb_copy_bits(skb, 0, nskb->data, start)) {
+				dev_kfree_skb(nskb);
+				dev_kfree_skb(skb);
+				return NULL;
+			}
+			*(__sum16 *)(skb->data + offset) = 0;
+			csum = skb_copy_and_csum_bits(skb, start,
+						      nskb->data + start,
+						      skb->len - start, 0);
+			if (iph->protocol == IPPROTO_TCP ||
+			    iph->protocol == IPPROTO_UDP) {
+				csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
+							 skb->len - start,
+							 iph->protocol, csum);
+			}
+			*(__sum16 *)(nskb->data + offset) = csum;
+
+			nskb->ip_summed = CHECKSUM_NONE;
+		} else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
+			dev_kfree_skb(nskb);
+			dev_kfree_skb(skb);
+			return NULL;
+		}
+		(void)skb_put(nskb, skb->len);
+		if (skb_is_gso(skb)) {
+			skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
+			skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
+		}
+		nskb->queue_mapping = skb->queue_mapping;
+		dev_kfree_skb(skb);
+		skb = nskb;
+	}
+	return skb;
+}
+
+static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb,
+				struct vnet_port *(*vnet_tx_port)
+				(struct sk_buff *, struct net_device *))
+{
+	struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
+	struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+	struct sk_buff *segs;
+	int maclen, datalen;
+	int status;
+	int gso_size, gso_type, gso_segs;
+	int hlen = skb_transport_header(skb) - skb_mac_header(skb);
+	int proto = IPPROTO_IP;
+
+	if (skb->protocol == htons(ETH_P_IP))
+		proto = ip_hdr(skb)->protocol;
+	else if (skb->protocol == htons(ETH_P_IPV6))
+		proto = ipv6_hdr(skb)->nexthdr;
+
+	if (proto == IPPROTO_TCP) {
+		hlen += tcp_hdr(skb)->doff * 4;
+	} else if (proto == IPPROTO_UDP) {
+		hlen += sizeof(struct udphdr);
+	} else {
+		pr_err("vnet_handle_offloads GSO with unknown transport "
+		       "protocol %d tproto %d\n", skb->protocol, proto);
+		hlen = 128; /* XXX */
+	}
+	datalen = port->tsolen - hlen;
+
+	gso_size = skb_shinfo(skb)->gso_size;
+	gso_type = skb_shinfo(skb)->gso_type;
+	gso_segs = skb_shinfo(skb)->gso_segs;
+
+	if (port->tso && gso_size < datalen)
+		gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
+
+	if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
+		struct netdev_queue *txq;
+
+		txq  = netdev_get_tx_queue(dev, port->q_index);
+		netif_tx_stop_queue(txq);
+		if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
+			return NETDEV_TX_BUSY;
+		netif_tx_wake_queue(txq);
+	}
+
+	maclen = skb_network_header(skb) - skb_mac_header(skb);
+	skb_pull(skb, maclen);
+
+	if (port->tso && gso_size < datalen) {
+		if (skb_unclone(skb, GFP_ATOMIC))
+			goto out_dropped;
+
+		/* segment to TSO size */
+		skb_shinfo(skb)->gso_size = datalen;
+		skb_shinfo(skb)->gso_segs = gso_segs;
+	}
+	segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
+	if (IS_ERR(segs))
+		goto out_dropped;
+
+	skb_push(skb, maclen);
+	skb_reset_mac_header(skb);
+
+	status = 0;
+	while (segs) {
+		struct sk_buff *curr = segs;
+
+		segs = segs->next;
+		curr->next = NULL;
+		if (port->tso && curr->len > dev->mtu) {
+			skb_shinfo(curr)->gso_size = gso_size;
+			skb_shinfo(curr)->gso_type = gso_type;
+			skb_shinfo(curr)->gso_segs =
+				DIV_ROUND_UP(curr->len - hlen, gso_size);
+		} else {
+			skb_shinfo(curr)->gso_size = 0;
+		}
+
+		skb_push(curr, maclen);
+		skb_reset_mac_header(curr);
+		memcpy(skb_mac_header(curr), skb_mac_header(skb),
+		       maclen);
+		curr->csum_start = skb_transport_header(curr) - curr->head;
+		if (ip_hdr(curr)->protocol == IPPROTO_TCP)
+			curr->csum_offset = offsetof(struct tcphdr, check);
+		else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
+			curr->csum_offset = offsetof(struct udphdr, check);
+
+		if (!(status & NETDEV_TX_MASK))
+			status = sunvnet_start_xmit_common(curr, dev,
+							   vnet_tx_port);
+		if (status & NETDEV_TX_MASK)
+			dev_kfree_skb_any(curr);
+	}
+
+	if (!(status & NETDEV_TX_MASK))
+		dev_kfree_skb_any(skb);
+	return status;
+out_dropped:
+	dev->stats.tx_dropped++;
+	dev_kfree_skb_any(skb);
+	return NETDEV_TX_OK;
+}
+
+int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
+			      struct vnet_port *(*vnet_tx_port)
+			      (struct sk_buff *, struct net_device *))
+{
+	struct vnet_port *port = NULL;
+	struct vio_dring_state *dr;
+	struct vio_net_desc *d;
+	unsigned int len;
+	struct sk_buff *freeskbs = NULL;
+	int i, err, txi;
+	unsigned pending = 0;
+	struct netdev_queue *txq;
+
+	rcu_read_lock();
+	port = vnet_tx_port(skb, dev);
+	if (unlikely(!port)) {
+		rcu_read_unlock();
+		goto out_dropped;
+	}
+
+	if (skb_is_gso(skb) && skb->len > port->tsolen) {
+		err = vnet_handle_offloads(port, skb, vnet_tx_port);
+		rcu_read_unlock();
+		return err;
+	}
+
+	if (!skb_is_gso(skb) && skb->len > port->rmtu) {
+		unsigned long localmtu = port->rmtu - ETH_HLEN;
+
+		if (vio_version_after_eq(&port->vio, 1, 3))
+			localmtu -= VLAN_HLEN;
+
+		if (skb->protocol == htons(ETH_P_IP)) {
+			struct flowi4 fl4;
+			struct rtable *rt = NULL;
+
+			memset(&fl4, 0, sizeof(fl4));
+			fl4.flowi4_oif = dev->ifindex;
+			fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
+			fl4.daddr = ip_hdr(skb)->daddr;
+			fl4.saddr = ip_hdr(skb)->saddr;
+
+			rt = ip_route_output_key(dev_net(dev), &fl4);
+			rcu_read_unlock();
+			if (!IS_ERR(rt)) {
+				skb_dst_set(skb, &rt->dst);
+				icmp_send(skb, ICMP_DEST_UNREACH,
+					  ICMP_FRAG_NEEDED,
+					  htonl(localmtu));
+			}
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		else if (skb->protocol == htons(ETH_P_IPV6))
+			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
+#endif
+		goto out_dropped;
+	}
+
+	skb = vnet_skb_shape(skb, 2);
+
+	if (unlikely(!skb))
+		goto out_dropped;
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL)
+		vnet_fullcsum(skb);
+
+	dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+	i = skb_get_queue_mapping(skb);
+	txq = netdev_get_tx_queue(dev, i);
+	if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
+		if (!netif_tx_queue_stopped(txq)) {
+			netif_tx_stop_queue(txq);
+
+			/* This is a hard error, log it. */
+			netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
+			dev->stats.tx_errors++;
+		}
+		rcu_read_unlock();
+		return NETDEV_TX_BUSY;
+	}
+
+	d = vio_dring_cur(dr);
+
+	txi = dr->prod;
+
+	freeskbs = vnet_clean_tx_ring(port, &pending);
+
+	BUG_ON(port->tx_bufs[txi].skb);
+
+	len = skb->len;
+	if (len < ETH_ZLEN)
+		len = ETH_ZLEN;
+
+	err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
+			   (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
+	if (err < 0) {
+		netdev_info(dev, "tx buffer map error %d\n", err);
+		goto out_dropped;
+	}
+
+	port->tx_bufs[txi].skb = skb;
+	skb = NULL;
+	port->tx_bufs[txi].ncookies = err;
+
+	/* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
+	 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
+	 * the protocol itself does not require it as long as the peer
+	 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
+	 *
+	 * An ACK for every packet in the ring is expensive as the
+	 * sending of LDC messages is slow and affects performance.
+	 */
+	d->hdr.ack = VIO_ACK_DISABLE;
+	d->size = len;
+	d->ncookies = port->tx_bufs[txi].ncookies;
+	for (i = 0; i < d->ncookies; i++)
+		d->cookies[i] = port->tx_bufs[txi].cookies[i];
+	if (vio_version_after_eq(&port->vio, 1, 7)) {
+		struct vio_net_dext *dext = vio_net_ext(d);
+
+		memset(dext, 0, sizeof(*dext));
+		if (skb_is_gso(port->tx_bufs[txi].skb)) {
+			dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
+					     ->gso_size;
+			dext->flags |= VNET_PKT_IPV4_LSO;
+		}
+		if (vio_version_after_eq(&port->vio, 1, 8) &&
+		    !port->switch_port) {
+			dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
+			dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
+		}
+	}
+
+	/* This has to be a non-SMP write barrier because we are writing
+	 * to memory which is shared with the peer LDOM.
+	 */
+	dma_wmb();
+
+	d->hdr.state = VIO_DESC_READY;
+
+	/* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
+	 * to notify the consumer that some descriptors are READY.
+	 * After that "start" trigger, no additional triggers are needed until
+	 * a DRING_STOPPED is received from the consumer. The dr->cons field
+	 * (set up by vnet_ack()) has the value of the next dring index
+	 * that has not yet been ack-ed. We send a "start" trigger here
+	 * if, and only if, start_cons is true (reset it afterward). Conversely,
+	 * vnet_ack() should check if the dring corresponding to cons
+	 * is marked READY, but start_cons was false.
+	 * If so, vnet_ack() should send out the missed "start" trigger.
+	 *
+	 * Note that the dma_wmb() above makes sure the cookies et al. are
+	 * not globally visible before the VIO_DESC_READY, and that the
+	 * stores are ordered correctly by the compiler. The consumer will
+	 * not proceed until the VIO_DESC_READY is visible assuring that
+	 * the consumer does not observe anything related to descriptors
+	 * out of order. The HV trap from the LDC start trigger is the
+	 * producer to consumer announcement that work is available to the
+	 * consumer
+	 */
+	if (!port->start_cons) { /* previous trigger suffices */
+		trace_vnet_skip_tx_trigger(port->vio._local_sid,
+					   port->vio._peer_sid, dr->cons);
+		goto ldc_start_done;
+	}
+
+	err = __vnet_tx_trigger(port, dr->cons);
+	if (unlikely(err < 0)) {
+		netdev_info(dev, "TX trigger error %d\n", err);
+		d->hdr.state = VIO_DESC_FREE;
+		skb = port->tx_bufs[txi].skb;
+		port->tx_bufs[txi].skb = NULL;
+		dev->stats.tx_carrier_errors++;
+		goto out_dropped;
+	}
+
+ldc_start_done:
+	port->start_cons = false;
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
+
+	dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
+	if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
+		netif_tx_stop_queue(txq);
+		if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
+			netif_tx_wake_queue(txq);
+	}
+
+	(void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
+	rcu_read_unlock();
+
+	vnet_free_skbs(freeskbs);
+
+	return NETDEV_TX_OK;
+
+out_dropped:
+	if (pending)
+		(void)mod_timer(&port->clean_timer,
+				jiffies + VNET_CLEAN_TIMEOUT);
+	else if (port)
+		del_timer(&port->clean_timer);
+	if (port)
+		rcu_read_unlock();
+	if (skb)
+		dev_kfree_skb(skb);
+	vnet_free_skbs(freeskbs);
+	dev->stats.tx_dropped++;
+	return NETDEV_TX_OK;
+}
+EXPORT_SYMBOL_GPL(sunvnet_start_xmit_common);
+
+void sunvnet_tx_timeout_common(struct net_device *dev)
+{
+	/* XXX Implement me XXX */
+}
+EXPORT_SYMBOL_GPL(sunvnet_tx_timeout_common);
+
+int sunvnet_open_common(struct net_device *dev)
+{
+	netif_carrier_on(dev);
+	netif_tx_start_all_queues(dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sunvnet_open_common);
+
+int sunvnet_close_common(struct net_device *dev)
+{
+	netif_tx_stop_all_queues(dev);
+	netif_carrier_off(dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sunvnet_close_common);
+
+static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
+{
+	struct vnet_mcast_entry *m;
+
+	for (m = vp->mcast_list; m; m = m->next) {
+		if (ether_addr_equal(m->addr, addr))
+			return m;
+	}
+	return NULL;
+}
+
+static void __update_mc_list(struct vnet *vp, struct net_device *dev)
+{
+	struct netdev_hw_addr *ha;
+
+	netdev_for_each_mc_addr(ha, dev) {
+		struct vnet_mcast_entry *m;
+
+		m = __vnet_mc_find(vp, ha->addr);
+		if (m) {
+			m->hit = 1;
+			continue;
+		}
+
+		if (!m) {
+			m = kzalloc(sizeof(*m), GFP_ATOMIC);
+			if (!m)
+				continue;
+			memcpy(m->addr, ha->addr, ETH_ALEN);
+			m->hit = 1;
+
+			m->next = vp->mcast_list;
+			vp->mcast_list = m;
+		}
+	}
+}
+
+static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
+{
+	struct vio_net_mcast_info info;
+	struct vnet_mcast_entry *m, **pp;
+	int n_addrs;
+
+	memset(&info, 0, sizeof(info));
+
+	info.tag.type = VIO_TYPE_CTRL;
+	info.tag.stype = VIO_SUBTYPE_INFO;
+	info.tag.stype_env = VNET_MCAST_INFO;
+	info.tag.sid = vio_send_sid(&port->vio);
+	info.set = 1;
+
+	n_addrs = 0;
+	for (m = vp->mcast_list; m; m = m->next) {
+		if (m->sent)
+			continue;
+		m->sent = 1;
+		memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
+		       m->addr, ETH_ALEN);
+		if (++n_addrs == VNET_NUM_MCAST) {
+			info.count = n_addrs;
+
+			(void)vio_ldc_send(&port->vio, &info,
+					   sizeof(info));
+			n_addrs = 0;
+		}
+	}
+	if (n_addrs) {
+		info.count = n_addrs;
+		(void)vio_ldc_send(&port->vio, &info, sizeof(info));
+	}
+
+	info.set = 0;
+
+	n_addrs = 0;
+	pp = &vp->mcast_list;
+	while ((m = *pp) != NULL) {
+		if (m->hit) {
+			m->hit = 0;
+			pp = &m->next;
+			continue;
+		}
+
+		memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
+		       m->addr, ETH_ALEN);
+		if (++n_addrs == VNET_NUM_MCAST) {
+			info.count = n_addrs;
+			(void)vio_ldc_send(&port->vio, &info,
+					   sizeof(info));
+			n_addrs = 0;
+		}
+
+		*pp = m->next;
+		kfree(m);
+	}
+	if (n_addrs) {
+		info.count = n_addrs;
+		(void)vio_ldc_send(&port->vio, &info, sizeof(info));
+	}
+}
+
+void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp)
+{
+	struct vnet_port *port;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(port, &vp->port_list, list) {
+		if (port->switch_port) {
+			__update_mc_list(vp, dev);
+			__send_mc_list(vp, port);
+			break;
+		}
+	}
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(sunvnet_set_rx_mode_common);
+
+int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu)
+{
+	if (new_mtu < 68 || new_mtu > 65535)
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sunvnet_change_mtu_common);
+
+int sunvnet_set_mac_addr_common(struct net_device *dev, void *p)
+{
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(sunvnet_set_mac_addr_common);
+
+void sunvnet_port_free_tx_bufs_common(struct vnet_port *port)
+{
+	struct vio_dring_state *dr;
+	int i;
+
+	dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+
+	if (!dr->base)
+		return;
+
+	for (i = 0; i < VNET_TX_RING_SIZE; i++) {
+		struct vio_net_desc *d;
+		void *skb = port->tx_bufs[i].skb;
+
+		if (!skb)
+			continue;
+
+		d = vio_dring_entry(dr, i);
+
+		ldc_unmap(port->vio.lp,
+			  port->tx_bufs[i].cookies,
+			  port->tx_bufs[i].ncookies);
+		dev_kfree_skb(skb);
+		port->tx_bufs[i].skb = NULL;
+		d->hdr.state = VIO_DESC_FREE;
+	}
+	ldc_free_exp_dring(port->vio.lp, dr->base,
+			   (dr->entry_size * dr->num_entries),
+			   dr->cookies, dr->ncookies);
+	dr->base = NULL;
+	dr->entry_size = 0;
+	dr->num_entries = 0;
+	dr->pending = 0;
+	dr->ncookies = 0;
+}
+EXPORT_SYMBOL_GPL(sunvnet_port_free_tx_bufs_common);
+
+static void vnet_port_reset(struct vnet_port *port)
+{
+	del_timer(&port->clean_timer);
+	sunvnet_port_free_tx_bufs_common(port);
+	port->rmtu = 0;
+	port->tso = true;
+	port->tsolen = 0;
+}
+
+static int vnet_port_alloc_tx_ring(struct vnet_port *port)
+{
+	struct vio_dring_state *dr;
+	unsigned long len, elen;
+	int i, err, ncookies;
+	void *dring;
+
+	dr = &port->vio.drings[VIO_DRIVER_TX_RING];
+
+	elen = sizeof(struct vio_net_desc) +
+	       sizeof(struct ldc_trans_cookie) * 2;
+	if (vio_version_after_eq(&port->vio, 1, 7))
+		elen += sizeof(struct vio_net_dext);
+	len = VNET_TX_RING_SIZE * elen;
+
+	ncookies = VIO_MAX_RING_COOKIES;
+	dring = ldc_alloc_exp_dring(port->vio.lp, len,
+				    dr->cookies, &ncookies,
+				    (LDC_MAP_SHADOW |
+				     LDC_MAP_DIRECT |
+				     LDC_MAP_RW));
+	if (IS_ERR(dring)) {
+		err = PTR_ERR(dring);
+		goto err_out;
+	}
+
+	dr->base = dring;
+	dr->entry_size = elen;
+	dr->num_entries = VNET_TX_RING_SIZE;
+	dr->prod = 0;
+	dr->cons = 0;
+	port->start_cons  = true; /* need an initial trigger */
+	dr->pending = VNET_TX_RING_SIZE;
+	dr->ncookies = ncookies;
+
+	for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
+		struct vio_net_desc *d;
+
+		d = vio_dring_entry(dr, i);
+		d->hdr.state = VIO_DESC_FREE;
+	}
+	return 0;
+
+err_out:
+	sunvnet_port_free_tx_bufs_common(port);
+
+	return err;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp)
+{
+	struct vnet_port *port;
+	unsigned long flags;
+
+	spin_lock_irqsave(&vp->lock, flags);
+	if (!list_empty(&vp->port_list)) {
+		port = list_entry(vp->port_list.next, struct vnet_port, list);
+		napi_schedule(&port->napi);
+	}
+	spin_unlock_irqrestore(&vp->lock, flags);
+}
+EXPORT_SYMBOL_GPL(sunvnet_poll_controller_common);
+#endif
+
+void sunvnet_port_add_txq_common(struct vnet_port *port)
+{
+	struct vnet *vp = port->vp;
+	int n;
+
+	n = vp->nports++;
+	n = n & (VNET_MAX_TXQS - 1);
+	port->q_index = n;
+	netif_tx_wake_queue(netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
+						port->q_index));
+}
+EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
+
+void sunvnet_port_rm_txq_common(struct vnet_port *port)
+{
+	port->vp->nports--;
+	netif_tx_stop_queue(netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
+						port->q_index));
+}
+EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);

drivers/net/ethernet/sun/sunvnet.h → drivers/net/ethernet/sun/sunvnet_common.h

-#ifndef _SUNVNET_H
-#define _SUNVNET_H
+#ifndef _SUNVNETCOMMON_H
+#define _SUNVNETCOMMON_H
 
 #include <linux/interrupt.h>
 
-#define DESC_NCOOKIES(entry_size)	\
-	((entry_size) - sizeof(struct vio_net_desc))
-
-/* length of time before we decide the hardware is borked,
- * and dev->tx_timeout() should be called to fix the problem
- */
-#define VNET_TX_TIMEOUT			(5 * HZ)
-
 /* length of time (or less) we expect pending descriptors to be marked
  * as VIO_DESC_DONE and skbs ready to be freed
  */
-#define	VNET_CLEAN_TIMEOUT		((HZ/100)+1)
+#define	VNET_CLEAN_TIMEOUT		((HZ / 100) + 1)
 
 #define VNET_MAXPACKET			(65535ULL + ETH_HLEN + VLAN_HLEN)
 #define VNET_TX_RING_SIZE		512
@@ -29,7 +21,9 @@
  */
 #define VNET_PACKET_SKIP		6
 
-#define VNET_MAXCOOKIES			(VNET_MAXPACKET/PAGE_SIZE + 1)
+#define	VNET_MAXCOOKIES			(VNET_MAXPACKET / PAGE_SIZE + 1)
+
+#define	VNET_MAX_TXQS		16
 
 struct vnet_tx_entry {
 	struct sk_buff		*skb;
@@ -38,6 +32,13 @@ struct vnet_tx_entry {
 };
 
 struct vnet;
+
+/* Structure to describe a vnet-port or vsw-port in the MD.
+ * If the vsw bit is set, this structure represents a vswitch
+ * port, and the net_device can be found from ->dev. If the
+ * vsw bit is not set, the net_device is available from ->vp->dev.
+ * See the VNET_PORT_TO_NET_DEVICE macro below.
+ */
 struct vnet_port {
 	struct vio_driver_state	vio;
 
@@ -45,9 +46,11 @@ struct vnet_port {
 	u8			raddr[ETH_ALEN];
 	unsigned		switch_port:1;
 	unsigned		tso:1;
-	unsigned		__pad:14;
+	unsigned		vsw:1;
+	unsigned		__pad:13;
 
 	struct vnet		*vp;
+	struct net_device	*dev;
 
 	struct vnet_tx_entry	tx_bufs[VNET_TX_RING_SIZE];
 
@@ -111,4 +114,32 @@ struct vnet {
 	int			nports;
 };
 
-#endif /* _SUNVNET_H */
+/* Def used by common code to get the net_device from the proper location */
+#define VNET_PORT_TO_NET_DEVICE(__port) \
+	((__port)->vsw ? (__port)->dev : (__port)->vp->dev)
+
+/* Common funcs */
+void sunvnet_clean_timer_expire_common(unsigned long port0);
+int sunvnet_open_common(struct net_device *dev);
+int sunvnet_close_common(struct net_device *dev);
+void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp);
+int sunvnet_set_mac_addr_common(struct net_device *dev, void *p);
+void sunvnet_tx_timeout_common(struct net_device *dev);
+int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu);
+int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
+			   struct vnet_port *(*vnet_tx_port)
+			   (struct sk_buff *, struct net_device *));
+#ifdef CONFIG_NET_POLL_CONTROLLER
+void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp);
+#endif
+void sunvnet_event_common(void *arg, int event);
+int sunvnet_send_attr_common(struct vio_driver_state *vio);
+int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg);
+void sunvnet_handshake_complete_common(struct vio_driver_state *vio);
+int sunvnet_poll_common(struct napi_struct *napi, int budget);
+void sunvnet_port_free_tx_bufs_common(struct vnet_port *port);
+bool sunvnet_port_is_up_common(struct vnet_port *vnet);
+void sunvnet_port_add_txq_common(struct vnet_port *port);
+void sunvnet_port_rm_txq_common(struct vnet_port *port);
+
+#endif /* _SUNVNETCOMMON_H */