[mirror_ubuntu-artful-kernel.git] / drivers / net / vsockmon.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <net/rtnetlink.h>
#include <net/sock.h>
#include <net/af_vsock.h>
#include <uapi/linux/vsockmon.h>
#include <linux/virtio_vsock.h>

/* Virtio transport max packet size plus header */
#define DEFAULT_MTU (VIRTIO_VSOCK_MAX_PKT_BUF_SIZE + \
		     sizeof(struct af_vsockmon_hdr))

struct pcpu_lstats {
	u64 rx_packets;
	u64 rx_bytes;
	struct u64_stats_sync syncp;
};

static int vsockmon_dev_init(struct net_device *dev)
{
	dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
	if (!dev->lstats)
		return -ENOMEM;
	return 0;
}

static void vsockmon_dev_uninit(struct net_device *dev)
{
	free_percpu(dev->lstats);
}

struct vsockmon {
	struct vsock_tap vt;
};

static int vsockmon_open(struct net_device *dev)
{
	struct vsockmon *vsockmon = netdev_priv(dev);

	vsockmon->vt.dev = dev;
	vsockmon->vt.module = THIS_MODULE;
	return vsock_add_tap(&vsockmon->vt);
}

static int vsockmon_close(struct net_device *dev)
{
	struct vsockmon *vsockmon = netdev_priv(dev);

	return vsock_remove_tap(&vsockmon->vt);
}

static netdev_tx_t vsockmon_xmit(struct sk_buff *skb, struct net_device *dev)
{
	int len = skb->len;
	struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats);

	u64_stats_update_begin(&stats->syncp);
	stats->rx_bytes += len;
	stats->rx_packets++;
	u64_stats_update_end(&stats->syncp);

	dev_kfree_skb(skb);

	return NETDEV_TX_OK;
}

static void
vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
	int i;
	u64 bytes = 0, packets = 0;

	for_each_possible_cpu(i) {
		const struct pcpu_lstats *vstats;
		u64 tbytes, tpackets;
		unsigned int start;

		vstats = per_cpu_ptr(dev->lstats, i);

		do {
			start = u64_stats_fetch_begin_irq(&vstats->syncp);
			tbytes = vstats->rx_bytes;
			tpackets = vstats->rx_packets;
		} while (u64_stats_fetch_retry_irq(&vstats->syncp, start));

		packets += tpackets;
		bytes += tbytes;
	}

	stats->rx_packets = packets;
	stats->tx_packets = 0;

	stats->rx_bytes = bytes;
	stats->tx_bytes = 0;
}

static int vsockmon_is_valid_mtu(int new_mtu)
{
	return new_mtu >= (int)sizeof(struct af_vsockmon_hdr);
}

static int vsockmon_change_mtu(struct net_device *dev, int new_mtu)
{
	if (!vsockmon_is_valid_mtu(new_mtu))
		return -EINVAL;

	dev->mtu = new_mtu;
	return 0;
}

static const struct net_device_ops vsockmon_ops = {
	.ndo_init = vsockmon_dev_init,
	.ndo_uninit = vsockmon_dev_uninit,
	.ndo_open = vsockmon_open,
	.ndo_stop = vsockmon_close,
	.ndo_start_xmit = vsockmon_xmit,
	.ndo_get_stats64 = vsockmon_get_stats64,
	.ndo_change_mtu = vsockmon_change_mtu,
};

static u32 always_on(struct net_device *dev)
{
	return 1;
}

static const struct ethtool_ops vsockmon_ethtool_ops = {
	.get_link = always_on,
};

static void vsockmon_setup(struct net_device *dev)
{
	dev->type = ARPHRD_VSOCKMON;
	dev->priv_flags |= IFF_NO_QUEUE;

	dev->netdev_ops	= &vsockmon_ops;
	dev->ethtool_ops = &vsockmon_ethtool_ops;
	dev->needs_free_netdev = true;

	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST |
			NETIF_F_HIGHDMA | NETIF_F_LLTX;

	dev->flags = IFF_NOARP;

	dev->mtu = DEFAULT_MTU;
}

static struct rtnl_link_ops vsockmon_link_ops __read_mostly = {
	.kind			= "vsockmon",
	.priv_size		= sizeof(struct vsockmon),
	.setup			= vsockmon_setup,
};

static __init int vsockmon_register(void)
{
	return rtnl_link_register(&vsockmon_link_ops);
}

static __exit void vsockmon_unregister(void)
{
	rtnl_link_unregister(&vsockmon_link_ops);
}

module_init(vsockmon_register);
module_exit(vsockmon_unregister);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>");
MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device.");
MODULE_ALIAS_RTNL_LINK("vsockmon");
Commit	Line	Data
0b2e6644 GG	1	#include <linux/module.h>
	2	#include <linux/kernel.h>
	3	#include <linux/if_arp.h>
	4	#include <net/rtnetlink.h>
	5	#include <net/sock.h>
	6	#include <net/af_vsock.h>
	7	#include <uapi/linux/vsockmon.h>
	8	#include <linux/virtio_vsock.h>
	9
	10	/* Virtio transport max packet size plus header */
	11	#define DEFAULT_MTU (VIRTIO_VSOCK_MAX_PKT_BUF_SIZE + \
	12	sizeof(struct af_vsockmon_hdr))
	13
	14	struct pcpu_lstats {
	15	u64 rx_packets;
	16	u64 rx_bytes;
	17	struct u64_stats_sync syncp;
	18	};
	19
	20	static int vsockmon_dev_init(struct net_device *dev)
	21	{
	22	dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
	23	if (!dev->lstats)
	24	return -ENOMEM;
	25	return 0;
	26	}
	27
	28	static void vsockmon_dev_uninit(struct net_device *dev)
	29	{
	30	free_percpu(dev->lstats);
	31	}
	32
	33	struct vsockmon {
	34	struct vsock_tap vt;
	35	};
	36
	37	static int vsockmon_open(struct net_device *dev)
	38	{
	39	struct vsockmon *vsockmon = netdev_priv(dev);
	40
	41	vsockmon->vt.dev = dev;
	42	vsockmon->vt.module = THIS_MODULE;
	43	return vsock_add_tap(&vsockmon->vt);
	44	}
	45
	46	static int vsockmon_close(struct net_device *dev)
	47	{
	48	struct vsockmon *vsockmon = netdev_priv(dev);
	49
	50	return vsock_remove_tap(&vsockmon->vt);
	51	}
	52
	53	static netdev_tx_t vsockmon_xmit(struct sk_buff skb, struct net_device dev)
	54	{
	55	int len = skb->len;
	56	struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats);
	57
	58	u64_stats_update_begin(&stats->syncp);
	59	stats->rx_bytes += len;
	60	stats->rx_packets++;
	61	u64_stats_update_end(&stats->syncp);
	62
	63	dev_kfree_skb(skb);
	64
65	return NETDEV_TX_OK;
66	}
67
68	static void
69	vsockmon_get_stats64(struct net_device dev, struct rtnl_link_stats64 stats)
70	{
71	int i;
72	u64 bytes = 0, packets = 0;
73
74	for_each_possible_cpu(i) {
75	const struct pcpu_lstats *vstats;
76	u64 tbytes, tpackets;
77	unsigned int start;
78
79	vstats = per_cpu_ptr(dev->lstats, i);
80
81	do {
82	start = u64_stats_fetch_begin_irq(&vstats->syncp);
83	tbytes = vstats->rx_bytes;
84	tpackets = vstats->rx_packets;
85	} while (u64_stats_fetch_retry_irq(&vstats->syncp, start));
86
87	packets += tpackets;
88	bytes += tbytes;
89	}
90
91	stats->rx_packets = packets;
92	stats->tx_packets = 0;
93
94	stats->rx_bytes = bytes;
95	stats->tx_bytes = 0;
96	}
97
98	static int vsockmon_is_valid_mtu(int new_mtu)
99	{
100	return new_mtu >= (int)sizeof(struct af_vsockmon_hdr);
101	}
102
103	static int vsockmon_change_mtu(struct net_device *dev, int new_mtu)
104	{
105	if (!vsockmon_is_valid_mtu(new_mtu))
106	return -EINVAL;
107
108	dev->mtu = new_mtu;
109	return 0;
110	}
111
112	static const struct net_device_ops vsockmon_ops = {
113	.ndo_init = vsockmon_dev_init,
114	.ndo_uninit = vsockmon_dev_uninit,
115	.ndo_open = vsockmon_open,
116	.ndo_stop = vsockmon_close,
117	.ndo_start_xmit = vsockmon_xmit,
118	.ndo_get_stats64 = vsockmon_get_stats64,
119	.ndo_change_mtu = vsockmon_change_mtu,
120	};
121
122	static u32 always_on(struct net_device *dev)
123	{
124	return 1;
125	}
126
127	static const struct ethtool_ops vsockmon_ethtool_ops = {
128	.get_link = always_on,
129	};
130
131	static void vsockmon_setup(struct net_device *dev)
132	{
133	dev->type = ARPHRD_VSOCKMON;
134	dev->priv_flags \|= IFF_NO_QUEUE;
135
136	dev->netdev_ops = &vsockmon_ops;
137	dev->ethtool_ops = &vsockmon_ethtool_ops;
cf124db5	138	dev->needs_free_netdev = true;
0b2e6644 GG	139
	140	dev->features = NETIF_F_SG \| NETIF_F_FRAGLIST \|
	141	NETIF_F_HIGHDMA \| NETIF_F_LLTX;
	142
	143	dev->flags = IFF_NOARP;
	144
	145	dev->mtu = DEFAULT_MTU;
	146	}
	147
	148	static struct rtnl_link_ops vsockmon_link_ops __read_mostly = {
	149	.kind = "vsockmon",
	150	.priv_size = sizeof(struct vsockmon),
	151	.setup = vsockmon_setup,
	152	};
	153
	154	static __init int vsockmon_register(void)
	155	{
	156	return rtnl_link_register(&vsockmon_link_ops);
	157	}
	158
	159	static __exit void vsockmon_unregister(void)
	160	{
	161	rtnl_link_unregister(&vsockmon_link_ops);
	162	}
	163
	164	module_init(vsockmon_register);
	165	module_exit(vsockmon_unregister);
	166
	167	MODULE_LICENSE("GPL v2");
	168	MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>");
	169	MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device.");
	170	MODULE_ALIAS_RTNL_LINK("vsockmon");