ldmvsw: Add ldmvsw.c driver code (5d01fa0c) · Commits · e / devices / android_kernel_fairphone_FP4

arch/sparc/configs/sparc64_defconfig

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Original line number	Diff line number	Diff line
		@@ -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

+11 −0

Original line number	Diff line number	Diff line
		@@ -80,6 +80,17 @@ config SUNVNET
		---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

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		@@ -9,4 +9,5 @@ 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

0 → 100644

+468 −0

Original line number	Diff line number	Diff line
		/* 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);