[mirror_ubuntu-eoan-kernel.git] / drivers / net / ethernet / sun / sunvnet.c

// SPDX-License-Identifier: GPL-2.0
/* sunvnet.c: Sun LDOM Virtual Network Driver.
 *
 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
 * Copyright (C) 2016-2017 Oracle. All rights reserved.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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>

#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"

/* 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	"2.0"
#define DRV_MODULE_RELDATE	"February 3, 2017"

static char version[] =
	DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM virtual network driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

/* Ordered from largest major to lowest */
static struct vio_version vnet_versions[] = {
	{ .major = 1, .minor = 8 },
	{ .major = 1, .minor = 7 },
	{ .major = 1, .minor = 6 },
	{ .major = 1, .minor = 0 },
};

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 {
	const char string[ETH_GSTRING_LEN];
} ethtool_stats_keys[] = {
	{ "rx_packets" },
	{ "tx_packets" },
	{ "rx_bytes" },
	{ "tx_bytes" },
	{ "rx_errors" },
	{ "tx_errors" },
	{ "rx_dropped" },
	{ "tx_dropped" },
	{ "multicast" },
	{ "rx_length_errors" },
	{ "rx_frame_errors" },
	{ "rx_missed_errors" },
	{ "tx_carrier_errors" },
	{ "nports" },
};

static int vnet_get_sset_count(struct net_device *dev, int sset)
{
	struct vnet *vp = (struct vnet *)netdev_priv(dev);

	switch (sset) {
	case ETH_SS_STATS:
		return ARRAY_SIZE(ethtool_stats_keys)
			+ (NUM_VNET_PORT_STATS * vp->nports);
	default:
		return -EOPNOTSUPP;
	}
}

static void vnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
{
	struct vnet *vp = (struct vnet *)netdev_priv(dev);
	struct vnet_port *port;
	char *p = (char *)buf;

	switch (stringset) {
	case ETH_SS_STATS:
		memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
		p += sizeof(ethtool_stats_keys);

		rcu_read_lock();
		list_for_each_entry_rcu(port, &vp->port_list, list) {
			snprintf(p, ETH_GSTRING_LEN, "p%u.%s-%pM",
				 port->q_index, port->switch_port ? "s" : "q",
				 port->raddr);
			p += ETH_GSTRING_LEN;
			snprintf(p, ETH_GSTRING_LEN, "p%u.rx_packets",
				 port->q_index);
			p += ETH_GSTRING_LEN;
			snprintf(p, ETH_GSTRING_LEN, "p%u.tx_packets",
				 port->q_index);
			p += ETH_GSTRING_LEN;
			snprintf(p, ETH_GSTRING_LEN, "p%u.rx_bytes",
				 port->q_index);
			p += ETH_GSTRING_LEN;
			snprintf(p, ETH_GSTRING_LEN, "p%u.tx_bytes",
				 port->q_index);
			p += ETH_GSTRING_LEN;
			snprintf(p, ETH_GSTRING_LEN, "p%u.event_up",
				 port->q_index);
			p += ETH_GSTRING_LEN;
			snprintf(p, ETH_GSTRING_LEN, "p%u.event_reset",
				 port->q_index);
			p += ETH_GSTRING_LEN;
		}
		rcu_read_unlock();
		break;
	default:
		WARN_ON(1);
		break;
	}
}

static void vnet_get_ethtool_stats(struct net_device *dev,
				   struct ethtool_stats *estats, u64 *data)
{
	struct vnet *vp = (struct vnet *)netdev_priv(dev);
	struct vnet_port *port;
	int i = 0;

	data[i++] = dev->stats.rx_packets;
	data[i++] = dev->stats.tx_packets;
	data[i++] = dev->stats.rx_bytes;
	data[i++] = dev->stats.tx_bytes;
	data[i++] = dev->stats.rx_errors;
	data[i++] = dev->stats.tx_errors;
	data[i++] = dev->stats.rx_dropped;
	data[i++] = dev->stats.tx_dropped;
	data[i++] = dev->stats.multicast;
	data[i++] = dev->stats.rx_length_errors;
	data[i++] = dev->stats.rx_frame_errors;
	data[i++] = dev->stats.rx_missed_errors;
	data[i++] = dev->stats.tx_carrier_errors;
	data[i++] = vp->nports;

	rcu_read_lock();
	list_for_each_entry_rcu(port, &vp->port_list, list) {
		data[i++] = port->q_index;
		data[i++] = port->stats.rx_packets;
		data[i++] = port->stats.tx_packets;
		data[i++] = port->stats.rx_bytes;
		data[i++] = port->stats.tx_bytes;
		data[i++] = port->stats.event_up;
		data[i++] = port->stats.event_reset;
	}
	rcu_read_unlock();
}

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,
	.get_sset_count		= vnet_get_sset_count,
	.get_strings		= vnet_get_strings,
	.get_ethtool_stats	= vnet_get_ethtool_stats,
};

static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);

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 (!sunvnet_port_is_up_common(port))
			continue;
		if (ether_addr_equal(port->raddr, skb->data))
			return port;
	}
	list_for_each_entry_rcu(port, &vp->port_list, list) {
		if (!port->switch_port)
			continue;
		if (!sunvnet_port_is_up_common(port))
			continue;
		return port;
	}
	return NULL;
}

/* 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)
{
	struct vnet *vp = netdev_priv(dev);

	return __tx_port_find(vp, skb);
}

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)
		return 0;

	return port->q_index;
}

/* Wrappers to common functions */
static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	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);

	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);

	return sunvnet_poll_controller_common(dev, vp);
}
#endif

static const struct net_device_ops vnet_ops = {
	.ndo_open		= sunvnet_open_common,
	.ndo_stop		= sunvnet_close_common,
	.ndo_set_rx_mode	= vnet_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_start_xmit		= vnet_start_xmit,
	.ndo_select_queue	= vnet_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= vnet_poll_controller,
#endif
};

static struct vnet *vnet_new(const u64 *local_mac,
			     struct vio_dev *vdev)
{
	struct net_device *dev;
	struct vnet *vp;
	int err, i;

	dev = alloc_etherdev_mqs(sizeof(*vp), 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] = (*local_mac >> (5 - i) * 8) & 0xff;

	vp = netdev_priv(dev);

	spin_lock_init(&vp->lock);
	vp->dev = dev;

	INIT_LIST_HEAD(&vp->port_list);
	for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
		INIT_HLIST_HEAD(&vp->port_hash[i]);
	INIT_LIST_HEAD(&vp->list);
	vp->local_mac = *local_mac;

	dev->netdev_ops = &vnet_ops;
	dev->ethtool_ops = &vnet_ethtool_ops;
	dev->watchdog_timeo = VNET_TX_TIMEOUT;

	dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_ALL_TSO |
			   NETIF_F_HW_CSUM | NETIF_F_SG;
	dev->features = dev->hw_features;

	/* MTU range: 68 - 65535 */
	dev->min_mtu = ETH_MIN_MTU;
	dev->max_mtu = VNET_MAX_MTU;

	SET_NETDEV_DEV(dev, &vdev->dev);

	err = register_netdev(dev);
	if (err) {
		pr_err("Cannot register net device, aborting\n");
		goto err_out_free_dev;
	}

	netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);

	list_add(&vp->list, &vnet_list);

	return vp;

err_out_free_dev:
	free_netdev(dev);

	return ERR_PTR(err);
}

static struct vnet *vnet_find_or_create(const u64 *local_mac,
					struct vio_dev *vdev)
{
	struct vnet *iter, *vp;

	mutex_lock(&vnet_list_mutex);
	vp = NULL;
	list_for_each_entry(iter, &vnet_list, list) {
		if (iter->local_mac == *local_mac) {
			vp = iter;
			break;
		}
	}
	if (!vp)
		vp = vnet_new(local_mac, vdev);
	mutex_unlock(&vnet_list_mutex);

	return vp;
}

static void vnet_cleanup(void)
{
	struct vnet *vp;
	struct net_device *dev;

	mutex_lock(&vnet_list_mutex);
	while (!list_empty(&vnet_list)) {
		vp = list_first_entry(&vnet_list, struct vnet, list);
		list_del(&vp->list);
		dev = vp->dev;
		/* vio_unregister_driver() should have cleaned up port_list */
		BUG_ON(!list_empty(&vp->port_list));
		unregister_netdev(dev);
		free_netdev(dev);
	}
	mutex_unlock(&vnet_list_mutex);
}

static const char *local_mac_prop = "local-mac-address";

static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
				     u64 port_node,
				     struct vio_dev *vdev)
{
	const u64 *local_mac = NULL;
	u64 a;

	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, "network"))
			continue;

		local_mac = mdesc_get_property(hp, target,
					       local_mac_prop, NULL);
		if (local_mac)
			break;
	}
	if (!local_mac)
		return ERR_PTR(-ENODEV);

	return vnet_find_or_create(local_mac, vdev);
}

static struct ldc_channel_config vnet_ldc_cfg = {
	.event		= sunvnet_event_common,
	.mtu		= 64,
	.mode		= LDC_MODE_UNRELIABLE,
};

static struct vio_driver_ops vnet_vio_ops = {
	.send_attr		= sunvnet_send_attr_common,
	.handle_attr		= sunvnet_handle_attr_common,
	.handshake_complete	= sunvnet_handshake_complete_common,
};

const char *remote_macaddr_prop = "remote-mac-address";

static int vnet_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;
	const u64 *rmac;
	int len, i, err, switch_port;

	hp = mdesc_grab();

	vp = vnet_find_parent(hp, vdev->mp, vdev);
	if (IS_ERR(vp)) {
		pr_err("Cannot find port parent vnet\n");
		err = PTR_ERR(vp);
		goto err_out_put_mdesc;
	}

	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);
		goto err_out_put_mdesc;
	}

	port = kzalloc(sizeof(*port), GFP_KERNEL);
	err = -ENOMEM;
	if (!port)
		goto err_out_put_mdesc;

	for (i = 0; i < ETH_ALEN; i++)
		port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;

	port->vp = vp;

	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
			      vnet_versions, ARRAY_SIZE(vnet_versions),
			      &vnet_vio_ops, vp->dev->name);
	if (err)
		goto err_out_free_port;

	err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
	if (err)
		goto err_out_free_port;

	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))
		switch_port = 1;
	port->switch_port = switch_port;
	port->tso = true;
	port->tsolen = 0;

	spin_lock_irqsave(&vp->lock, flags);
	if (switch_port)
		list_add_rcu(&port->list, &vp->port_list);
	else
		list_add_tail_rcu(&port->list, &vp->port_list);
	hlist_add_head_rcu(&port->hash,
			   &vp->port_hash[vnet_hashfn(port->raddr)]);
	sunvnet_port_add_txq_common(port);
	spin_unlock_irqrestore(&vp->lock, flags);

	dev_set_drvdata(&vdev->dev, port);

	pr_info("%s: PORT ( remote-mac %pM%s )\n",
		vp->dev->name, port->raddr, switch_port ? " switch-port" : "");

	timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);

	napi_enable(&port->napi);
	vio_port_up(&port->vio);

	mdesc_release(hp);

	return 0;

err_out_free_port:
	kfree(port);

err_out_put_mdesc:
	mdesc_release(hp);
	return err;
}

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);

		list_del_rcu(&port->list);
		hlist_del_rcu(&port->hash);

		synchronize_rcu();
		del_timer_sync(&port->clean_timer);
		sunvnet_port_rm_txq_common(port);
		netif_napi_del(&port->napi);
		sunvnet_port_free_tx_bufs_common(port);
		vio_ldc_free(&port->vio);

		dev_set_drvdata(&vdev->dev, NULL);

		kfree(port);
	}
	return 0;
}

static const struct vio_device_id vnet_port_match[] = {
	{
		.type = "vnet-port",
	},
	{},
};
MODULE_DEVICE_TABLE(vio, vnet_port_match);

static struct vio_driver vnet_port_driver = {
	.id_table	= vnet_port_match,
	.probe		= vnet_port_probe,
	.remove		= vnet_port_remove,
	.name		= "vnet_port",
};

static int __init vnet_init(void)
{
	pr_info("%s\n", version);
	return vio_register_driver(&vnet_port_driver);
}

static void __exit vnet_exit(void)
{
	vio_unregister_driver(&vnet_port_driver);
	vnet_cleanup();
}

module_init(vnet_init);
module_exit(vnet_exit);
Commit	Line	Data
c861ef83	1	// SPDX-License-Identifier: GPL-2.0
4c521e42 DM	2	/* sunvnet.c: Sun LDOM Virtual Network Driver.
4c521e42 DM	3	*
3d452e55	4	* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
0f512c84	5	* Copyright (C) 2016-2017 Oracle. All rights reserved.
4c521e42 DM	6	*/
4c521e42 DM	7
4d5870ec JP	8	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
4d5870ec JP	9
4c521e42 DM	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/types.h>
	13	#include <linux/slab.h>
	14	#include <linux/delay.h>
	15	#include <linux/init.h>
	16	#include <linux/netdevice.h>
	17	#include <linux/ethtool.h>
	18	#include <linux/etherdevice.h>
9184a046	19	#include <linux/mutex.h>
da38c564	20	#include <linux/highmem.h>
e4defc77	21	#include <linux/if_vlan.h>
4c521e42	22
a2b78e9b DS	23	#if IS_ENABLED(CONFIG_IPV6)
	24	#include <linux/icmpv6.h>
	25	#endif
	26
6d0ba919	27	#include <net/ip.h>
a2b78e9b DS	28	#include <net/icmp.h>
	29	#include <net/route.h>
	30
4c521e42 DM	31	#include <asm/vio.h>
	32	#include <asm/ldc.h>
	33
31762eaa AY	34	#include "sunvnet_common.h"
	35
	36	/* length of time before we decide the hardware is borked,
	37	* and dev->tx_timeout() should be called to fix the problem
	38	*/
	39	#define VNET_TX_TIMEOUT (5 * HZ)
4c521e42 DM	40
4c521e42 DM	41	#define DRV_MODULE_NAME "sunvnet"
f2f3e210 SN	42	#define DRV_MODULE_VERSION "2.0"
f2f3e210 SN	43	#define DRV_MODULE_RELDATE "February 3, 2017"
4c521e42	44
f73d12bd	45	static char version[] =
f2f3e210	46	DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
4c521e42 DM	47	MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
	48	MODULE_DESCRIPTION("Sun LDOM virtual network driver");
	49	MODULE_LICENSE("GPL");
	50	MODULE_VERSION(DRV_MODULE_VERSION);
	51
	52	/* Ordered from largest major to lowest */
	53	static struct vio_version vnet_versions[] = {
6d0ba919 DS	54	{ .major = 1, .minor = 8 },
6d0ba919 DS	55	{ .major = 1, .minor = 7 },
e4defc77	56	{ .major = 1, .minor = 6 },
4c521e42 DM	57	{ .major = 1, .minor = 0 },
	58	};
	59
4c521e42 DM	60	static void vnet_get_drvinfo(struct net_device *dev,
	61	struct ethtool_drvinfo *info)
	62	{
7826d43f JP	63	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
7826d43f JP	64	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
4c521e42 DM	65	}
	66
	67	static u32 vnet_get_msglevel(struct net_device *dev)
	68	{
	69	struct vnet *vp = netdev_priv(dev);
dc153f85	70
4c521e42 DM	71	return vp->msg_enable;
	72	}
	73
	74	static void vnet_set_msglevel(struct net_device *dev, u32 value)
	75	{
	76	struct vnet *vp = netdev_priv(dev);
dc153f85	77
4c521e42 DM	78	vp->msg_enable = value;
	79	}
	80
0f512c84 SN	81	static const struct {
	82	const char string[ETH_GSTRING_LEN];
	83	} ethtool_stats_keys[] = {
	84	{ "rx_packets" },
	85	{ "tx_packets" },
	86	{ "rx_bytes" },
	87	{ "tx_bytes" },
	88	{ "rx_errors" },
	89	{ "tx_errors" },
	90	{ "rx_dropped" },
	91	{ "tx_dropped" },
	92	{ "multicast" },
	93	{ "rx_length_errors" },
	94	{ "rx_frame_errors" },
	95	{ "rx_missed_errors" },
	96	{ "tx_carrier_errors" },
	97	{ "nports" },
	98	};
	99
	100	static int vnet_get_sset_count(struct net_device *dev, int sset)
	101	{
	102	struct vnet vp = (struct vnet )netdev_priv(dev);
	103
	104	switch (sset) {
	105	case ETH_SS_STATS:
	106	return ARRAY_SIZE(ethtool_stats_keys)
	107	+ (NUM_VNET_PORT_STATS * vp->nports);
	108	default:
	109	return -EOPNOTSUPP;
	110	}
	111	}
	112
	113	static void vnet_get_strings(struct net_device dev, u32 stringset, u8 buf)
	114	{
	115	struct vnet vp = (struct vnet )netdev_priv(dev);
	116	struct vnet_port *port;
	117	char p = (char )buf;
	118
	119	switch (stringset) {
	120	case ETH_SS_STATS:
	121	memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
	122	p += sizeof(ethtool_stats_keys);
	123
	124	rcu_read_lock();
	125	list_for_each_entry_rcu(port, &vp->port_list, list) {
	126	snprintf(p, ETH_GSTRING_LEN, "p%u.%s-%pM",
	127	port->q_index, port->switch_port ? "s" : "q",
	128	port->raddr);
	129	p += ETH_GSTRING_LEN;
	130	snprintf(p, ETH_GSTRING_LEN, "p%u.rx_packets",
	131	port->q_index);
	132	p += ETH_GSTRING_LEN;
	133	snprintf(p, ETH_GSTRING_LEN, "p%u.tx_packets",
	134	port->q_index);
	135	p += ETH_GSTRING_LEN;
	136	snprintf(p, ETH_GSTRING_LEN, "p%u.rx_bytes",
	137	port->q_index);
	138	p += ETH_GSTRING_LEN;
	139	snprintf(p, ETH_GSTRING_LEN, "p%u.tx_bytes",
	140	port->q_index);
	141	p += ETH_GSTRING_LEN;
	142	snprintf(p, ETH_GSTRING_LEN, "p%u.event_up",
	143	port->q_index);
	144	p += ETH_GSTRING_LEN;
145	snprintf(p, ETH_GSTRING_LEN, "p%u.event_reset",
146	port->q_index);
147	p += ETH_GSTRING_LEN;
148	}
149	rcu_read_unlock();
150	break;
151	default:
152	WARN_ON(1);
153	break;
154	}
155	}
156
157	static void vnet_get_ethtool_stats(struct net_device *dev,
158	struct ethtool_stats estats, u64 data)
159	{
160	struct vnet vp = (struct vnet )netdev_priv(dev);
161	struct vnet_port *port;
162	int i = 0;
163
164	data[i++] = dev->stats.rx_packets;
165	data[i++] = dev->stats.tx_packets;
166	data[i++] = dev->stats.rx_bytes;
167	data[i++] = dev->stats.tx_bytes;
168	data[i++] = dev->stats.rx_errors;
169	data[i++] = dev->stats.tx_errors;
170	data[i++] = dev->stats.rx_dropped;
171	data[i++] = dev->stats.tx_dropped;
172	data[i++] = dev->stats.multicast;
173	data[i++] = dev->stats.rx_length_errors;
174	data[i++] = dev->stats.rx_frame_errors;
175	data[i++] = dev->stats.rx_missed_errors;
176	data[i++] = dev->stats.tx_carrier_errors;
177	data[i++] = vp->nports;
178
179	rcu_read_lock();
180	list_for_each_entry_rcu(port, &vp->port_list, list) {
181	data[i++] = port->q_index;
182	data[i++] = port->stats.rx_packets;
183	data[i++] = port->stats.tx_packets;
184	data[i++] = port->stats.rx_bytes;
185	data[i++] = port->stats.tx_bytes;
186	data[i++] = port->stats.event_up;
187	data[i++] = port->stats.event_reset;
188	}
189	rcu_read_unlock();
190	}
191
4c521e42 DM	192	static const struct ethtool_ops vnet_ethtool_ops = {
	193	.get_drvinfo = vnet_get_drvinfo,
	194	.get_msglevel = vnet_get_msglevel,
	195	.set_msglevel = vnet_set_msglevel,
	196	.get_link = ethtool_op_get_link,
0f512c84 SN	197	.get_sset_count = vnet_get_sset_count,
	198	.get_strings = vnet_get_strings,
	199	.get_ethtool_stats = vnet_get_ethtool_stats,
4c521e42 DM	200	};
4c521e42 DM	201
9184a046 DM	202	static LIST_HEAD(vnet_list);
	203	static DEFINE_MUTEX(vnet_list_mutex);
	204
67d0719f AY	205	static struct vnet_port __tx_port_find(struct vnet vp, struct sk_buff *skb)
	206	{
	207	unsigned int hash = vnet_hashfn(skb->data);
	208	struct hlist_head *hp = &vp->port_hash[hash];
	209	struct vnet_port *port;
	210
	211	hlist_for_each_entry_rcu(port, hp, hash) {
	212	if (!sunvnet_port_is_up_common(port))
	213	continue;
	214	if (ether_addr_equal(port->raddr, skb->data))
	215	return port;
	216	}
	217	list_for_each_entry_rcu(port, &vp->port_list, list) {
	218	if (!port->switch_port)
	219	continue;
	220	if (!sunvnet_port_is_up_common(port))
	221	continue;
	222	return port;
	223	}
	224	return NULL;
	225	}
	226
	227	/* func arg to vnet_start_xmit_common() to get the proper tx port */
	228	static struct vnet_port vnet_tx_port_find(struct sk_buff skb,
	229	struct net_device *dev)
	230	{
	231	struct vnet *vp = netdev_priv(dev);
	232
	233	return __tx_port_find(vp, skb);
	234	}
	235
	236	static u16 vnet_select_queue(struct net_device dev, struct sk_buff skb,
	237	void *accel_priv, select_queue_fallback_t fallback)
	238	{
	239	struct vnet *vp = netdev_priv(dev);
	240	struct vnet_port *port = __tx_port_find(vp, skb);
	241
	242	if (!port)
	243	return 0;
	244
	245	return port->q_index;
	246	}
	247
	248	/* Wrappers to common functions */
	249	static int vnet_start_xmit(struct sk_buff skb, struct net_device dev)
	250	{
	251	return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find);
	252	}
	253
	254	static void vnet_set_rx_mode(struct net_device *dev)
	255	{
	256	struct vnet *vp = netdev_priv(dev);
	257
	258	return sunvnet_set_rx_mode_common(dev, vp);
	259	}
	260
	261	#ifdef CONFIG_NET_POLL_CONTROLLER
	262	static void vnet_poll_controller(struct net_device *dev)
	263	{
	264	struct vnet *vp = netdev_priv(dev);
	265
	266	return sunvnet_poll_controller_common(dev, vp);
	267	}
	268	#endif
269
8fd17f2e	270	static const struct net_device_ops vnet_ops = {
31762eaa AY	271	.ndo_open = sunvnet_open_common,
31762eaa AY	272	.ndo_stop = sunvnet_close_common,
67d0719f	273	.ndo_set_rx_mode = vnet_set_rx_mode,
31762eaa	274	.ndo_set_mac_address = sunvnet_set_mac_addr_common,
240c102d	275	.ndo_validate_addr = eth_validate_addr,
31762eaa	276	.ndo_tx_timeout = sunvnet_tx_timeout_common,
67d0719f AY	277	.ndo_start_xmit = vnet_start_xmit,
67d0719f AY	278	.ndo_select_queue = vnet_select_queue,
69088822	279	#ifdef CONFIG_NET_POLL_CONTROLLER
67d0719f	280	.ndo_poll_controller = vnet_poll_controller,
69088822	281	#endif
8fd17f2e DM	282	};
8fd17f2e DM	283
4c5d283a SV	284	static struct vnet vnet_new(const u64 local_mac,
4c5d283a SV	285	struct vio_dev *vdev)
9184a046 DM	286	{
	287	struct net_device *dev;
	288	struct vnet *vp;
	289	int err, i;
	290
d51bffd1	291	dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
41de8d4c	292	if (!dev)
9184a046	293	return ERR_PTR(-ENOMEM);
8e845f4c DS	294	dev->needed_headroom = VNET_PACKET_SKIP + 8;
8e845f4c DS	295	dev->needed_tailroom = 8;
9184a046 DM	296
	297	for (i = 0; i < ETH_ALEN; i++)
	298	dev->dev_addr[i] = (local_mac >> (5 - i) 8) & 0xff;
	299
9184a046 DM	300	vp = netdev_priv(dev);
	301
	302	spin_lock_init(&vp->lock);
	303	vp->dev = dev;
	304
	305	INIT_LIST_HEAD(&vp->port_list);
	306	for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
	307	INIT_HLIST_HEAD(&vp->port_hash[i]);
	308	INIT_LIST_HEAD(&vp->list);
	309	vp->local_mac = *local_mac;
	310
8fd17f2e	311	dev->netdev_ops = &vnet_ops;
9184a046 DM	312	dev->ethtool_ops = &vnet_ethtool_ops;
9184a046 DM	313	dev->watchdog_timeo = VNET_TX_TIMEOUT;
9184a046	314
cf55612a	315	dev->hw_features = NETIF_F_TSO \| NETIF_F_GSO \| NETIF_F_ALL_TSO \|
98524e04	316	NETIF_F_HW_CSUM \| NETIF_F_SG;
da38c564 DS	317	dev->features = dev->hw_features;
da38c564 DS	318
540bfe30 JW	319	/* MTU range: 68 - 65535 */
	320	dev->min_mtu = ETH_MIN_MTU;
	321	dev->max_mtu = VNET_MAX_MTU;
	322
4c5d283a SV	323	SET_NETDEV_DEV(dev, &vdev->dev);
4c5d283a SV	324
9184a046 DM	325	err = register_netdev(dev);
9184a046 DM	326	if (err) {
4d5870ec	327	pr_err("Cannot register net device, aborting\n");
9184a046 DM	328	goto err_out_free_dev;
	329	}
	330
4d5870ec	331	netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
9184a046 DM	332
	333	list_add(&vp->list, &vnet_list);
	334
	335	return vp;
	336
	337	err_out_free_dev:
	338	free_netdev(dev);
	339
	340	return ERR_PTR(err);
	341	}
	342
4c5d283a SV	343	static struct vnet vnet_find_or_create(const u64 local_mac,
4c5d283a SV	344	struct vio_dev *vdev)
9184a046 DM	345	{
	346	struct vnet iter, vp;
	347
	348	mutex_lock(&vnet_list_mutex);
	349	vp = NULL;
	350	list_for_each_entry(iter, &vnet_list, list) {
	351	if (iter->local_mac == *local_mac) {
	352	vp = iter;
	353	break;
	354	}
	355	}
	356	if (!vp)
4c5d283a	357	vp = vnet_new(local_mac, vdev);
9184a046 DM	358	mutex_unlock(&vnet_list_mutex);
	359
	360	return vp;
	361	}
	362
a4b70a07 SV	363	static void vnet_cleanup(void)
	364	{
	365	struct vnet *vp;
	366	struct net_device *dev;
	367
	368	mutex_lock(&vnet_list_mutex);
	369	while (!list_empty(&vnet_list)) {
	370	vp = list_first_entry(&vnet_list, struct vnet, list);
	371	list_del(&vp->list);
	372	dev = vp->dev;
	373	/* vio_unregister_driver() should have cleaned up port_list */
	374	BUG_ON(!list_empty(&vp->port_list));
	375	unregister_netdev(dev);
	376	free_netdev(dev);
	377	}
	378	mutex_unlock(&vnet_list_mutex);
	379	}
	380
9184a046 DM	381	static const char *local_mac_prop = "local-mac-address";
9184a046 DM	382
f73d12bd	383	static struct vnet vnet_find_parent(struct mdesc_handle hp,
4c5d283a SV	384	u64 port_node,
4c5d283a SV	385	struct vio_dev *vdev)
9184a046 DM	386	{
	387	const u64 *local_mac = NULL;
	388	u64 a;
	389
	390	mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
	391	u64 target = mdesc_arc_target(hp, a);
	392	const char *name;
	393
	394	name = mdesc_get_property(hp, target, "name", NULL);
	395	if (!name \|\| strcmp(name, "network"))
	396	continue;
	397
	398	local_mac = mdesc_get_property(hp, target,
	399	local_mac_prop, NULL);
	400	if (local_mac)
	401	break;
	402	}
	403	if (!local_mac)
	404	return ERR_PTR(-ENODEV);
	405
4c5d283a	406	return vnet_find_or_create(local_mac, vdev);
9184a046 DM	407	}
9184a046 DM	408
4c521e42	409	static struct ldc_channel_config vnet_ldc_cfg = {
31762eaa	410	.event = sunvnet_event_common,
4c521e42 DM	411	.mtu = 64,
	412	.mode = LDC_MODE_UNRELIABLE,
	413	};
	414
	415	static struct vio_driver_ops vnet_vio_ops = {
31762eaa AY	416	.send_attr = sunvnet_send_attr_common,
	417	.handle_attr = sunvnet_handle_attr_common,
	418	.handshake_complete = sunvnet_handshake_complete_common,
4c521e42 DM	419	};
	420
	421	const char *remote_macaddr_prop = "remote-mac-address";
	422
1dd06ae8	423	static int vnet_port_probe(struct vio_dev vdev, const struct vio_device_id id)
4c521e42	424	{
43fdf274	425	struct mdesc_handle *hp;
4c521e42 DM	426	struct vnet_port *port;
	427	unsigned long flags;
	428	struct vnet *vp;
	429	const u64 *rmac;
	430	int len, i, err, switch_port;
	431
43fdf274 DM	432	hp = mdesc_grab();
43fdf274 DM	433
4c5d283a	434	vp = vnet_find_parent(hp, vdev->mp, vdev);
9184a046	435	if (IS_ERR(vp)) {
4d5870ec	436	pr_err("Cannot find port parent vnet\n");
9184a046 DM	437	err = PTR_ERR(vp);
	438	goto err_out_put_mdesc;
	439	}
	440
43fdf274 DM	441	rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
43fdf274 DM	442	err = -ENODEV;
4c521e42	443	if (!rmac) {
4d5870ec	444	pr_err("Port lacks %s property\n", remote_macaddr_prop);
43fdf274	445	goto err_out_put_mdesc;
4c521e42 DM	446	}
	447
	448	port = kzalloc(sizeof(*port), GFP_KERNEL);
43fdf274	449	err = -ENOMEM;
e404decb	450	if (!port)
43fdf274	451	goto err_out_put_mdesc;
4c521e42 DM	452
	453	for (i = 0; i < ETH_ALEN; i++)
	454	port->raddr[i] = (rmac >> (5 - i) 8) & 0xff;
	455
	456	port->vp = vp;
	457
43fdf274	458	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
4c521e42 DM	459	vnet_versions, ARRAY_SIZE(vnet_versions),
	460	&vnet_vio_ops, vp->dev->name);
	461	if (err)
	462	goto err_out_free_port;
	463
	464	err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
	465	if (err)
	466	goto err_out_free_port;
	467
31762eaa AY	468	netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common,
31762eaa AY	469	NAPI_POLL_WEIGHT);
69088822	470
4c521e42 DM	471	INIT_HLIST_NODE(&port->hash);
	472	INIT_LIST_HEAD(&port->list);
	473
	474	switch_port = 0;
dc153f85	475	if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL))
4c521e42	476	switch_port = 1;
028ebff2	477	port->switch_port = switch_port;
368e36ed DS	478	port->tso = true;
368e36ed DS	479	port->tsolen = 0;
4c521e42 DM	480
	481	spin_lock_irqsave(&vp->lock, flags);
	482	if (switch_port)
2a968dd8	483	list_add_rcu(&port->list, &vp->port_list);
4c521e42	484	else
2a968dd8 SV	485	list_add_tail_rcu(&port->list, &vp->port_list);
	486	hlist_add_head_rcu(&port->hash,
	487	&vp->port_hash[vnet_hashfn(port->raddr)]);
31762eaa	488	sunvnet_port_add_txq_common(port);
4c521e42 DM	489	spin_unlock_irqrestore(&vp->lock, flags);
	490
	491	dev_set_drvdata(&vdev->dev, port);
	492
4d5870ec JP	493	pr_info("%s: PORT ( remote-mac %pM%s )\n",
4d5870ec JP	494	vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
4c521e42	495
0822c5d9	496	timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
8e845f4c	497
69088822	498	napi_enable(&port->napi);
4c521e42 DM	499	vio_port_up(&port->vio);
4c521e42 DM	500
43fdf274 DM	501	mdesc_release(hp);
43fdf274 DM	502
4c521e42 DM	503	return 0;
4c521e42 DM	504
4c521e42 DM	505	err_out_free_port:
	506	kfree(port);
	507
43fdf274 DM	508	err_out_put_mdesc:
43fdf274 DM	509	mdesc_release(hp);
4c521e42 DM	510	return err;
	511	}
	512
	513	static int vnet_port_remove(struct vio_dev *vdev)
	514	{
	515	struct vnet_port *port = dev_get_drvdata(&vdev->dev);
	516
	517	if (port) {
4c521e42 DM	518	del_timer_sync(&port->vio.timer);
4c521e42 DM	519
69088822	520	napi_disable(&port->napi);
4c521e42	521
2a968dd8 SV	522	list_del_rcu(&port->list);
	523	hlist_del_rcu(&port->hash);
	524
	525	synchronize_rcu();
	526	del_timer_sync(&port->clean_timer);
31762eaa	527	sunvnet_port_rm_txq_common(port);
69088822	528	netif_napi_del(&port->napi);
31762eaa	529	sunvnet_port_free_tx_bufs_common(port);
4c521e42 DM	530	vio_ldc_free(&port->vio);
	531
	532	dev_set_drvdata(&vdev->dev, NULL);
	533
	534	kfree(port);
	535	}
	536	return 0;
	537	}
	538
3d452e55	539	static const struct vio_device_id vnet_port_match[] = {
4c521e42 DM	540	{
	541	.type = "vnet-port",
	542	},
	543	{},
	544	};
da68e081	545	MODULE_DEVICE_TABLE(vio, vnet_port_match);
4c521e42 DM	546
	547	static struct vio_driver vnet_port_driver = {
	548	.id_table = vnet_port_match,
	549	.probe = vnet_port_probe,
	550	.remove = vnet_port_remove,
cb52d897	551	.name = "vnet_port",
4c521e42 DM	552	};
4c521e42 DM	553
4c521e42 DM	554	static int __init vnet_init(void)
4c521e42 DM	555	{
f2f3e210	556	pr_info("%s\n", version);
9184a046	557	return vio_register_driver(&vnet_port_driver);
4c521e42 DM	558	}
	559
	560	static void __exit vnet_exit(void)
	561	{
	562	vio_unregister_driver(&vnet_port_driver);
a4b70a07	563	vnet_cleanup();
4c521e42 DM	564	}
	565
	566	module_init(vnet_init);
	567	module_exit(vnet_exit);