[linux-2.6-block.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))

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->bytes += len;
	stats->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->bytes;
			tpackets = vstats->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
0b2e6644 GG	14	static int vsockmon_dev_init(struct net_device *dev)
	15	{
	16	dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
	17	if (!dev->lstats)
	18	return -ENOMEM;
	19	return 0;
	20	}
	21
	22	static void vsockmon_dev_uninit(struct net_device *dev)
	23	{
	24	free_percpu(dev->lstats);
	25	}
	26
	27	struct vsockmon {
	28	struct vsock_tap vt;
	29	};
	30
	31	static int vsockmon_open(struct net_device *dev)
	32	{
	33	struct vsockmon *vsockmon = netdev_priv(dev);
	34
	35	vsockmon->vt.dev = dev;
	36	vsockmon->vt.module = THIS_MODULE;
	37	return vsock_add_tap(&vsockmon->vt);
	38	}
	39
	40	static int vsockmon_close(struct net_device *dev)
	41	{
	42	struct vsockmon *vsockmon = netdev_priv(dev);
	43
	44	return vsock_remove_tap(&vsockmon->vt);
	45	}
	46
	47	static netdev_tx_t vsockmon_xmit(struct sk_buff skb, struct net_device dev)
	48	{
	49	int len = skb->len;
	50	struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats);
	51
	52	u64_stats_update_begin(&stats->syncp);
52bb6677 LR	53	stats->bytes += len;
52bb6677 LR	54	stats->packets++;
0b2e6644 GG	55	u64_stats_update_end(&stats->syncp);
	56
	57	dev_kfree_skb(skb);
	58
	59	return NETDEV_TX_OK;
	60	}
	61
	62	static void
	63	vsockmon_get_stats64(struct net_device dev, struct rtnl_link_stats64 stats)
	64	{
	65	int i;
	66	u64 bytes = 0, packets = 0;
	67
	68	for_each_possible_cpu(i) {
	69	const struct pcpu_lstats *vstats;
	70	u64 tbytes, tpackets;
	71	unsigned int start;
	72
	73	vstats = per_cpu_ptr(dev->lstats, i);
	74
	75	do {
	76	start = u64_stats_fetch_begin_irq(&vstats->syncp);
52bb6677 LR	77	tbytes = vstats->bytes;
52bb6677 LR	78	tpackets = vstats->packets;
0b2e6644 GG	79	} while (u64_stats_fetch_retry_irq(&vstats->syncp, start));
	80
	81	packets += tpackets;
	82	bytes += tbytes;
	83	}
	84
	85	stats->rx_packets = packets;
	86	stats->tx_packets = 0;
	87
	88	stats->rx_bytes = bytes;
	89	stats->tx_bytes = 0;
	90	}
	91
	92	static int vsockmon_is_valid_mtu(int new_mtu)
	93	{
	94	return new_mtu >= (int)sizeof(struct af_vsockmon_hdr);
	95	}
	96
	97	static int vsockmon_change_mtu(struct net_device *dev, int new_mtu)
	98	{
	99	if (!vsockmon_is_valid_mtu(new_mtu))
	100	return -EINVAL;
	101
	102	dev->mtu = new_mtu;
	103	return 0;
	104	}
	105
	106	static const struct net_device_ops vsockmon_ops = {
	107	.ndo_init = vsockmon_dev_init,
	108	.ndo_uninit = vsockmon_dev_uninit,
	109	.ndo_open = vsockmon_open,
	110	.ndo_stop = vsockmon_close,
	111	.ndo_start_xmit = vsockmon_xmit,
	112	.ndo_get_stats64 = vsockmon_get_stats64,
	113	.ndo_change_mtu = vsockmon_change_mtu,
	114	};
	115
	116	static u32 always_on(struct net_device *dev)
	117	{
	118	return 1;
	119	}
	120
	121	static const struct ethtool_ops vsockmon_ethtool_ops = {
	122	.get_link = always_on,
	123	};
	124
	125	static void vsockmon_setup(struct net_device *dev)
	126	{
	127	dev->type = ARPHRD_VSOCKMON;
	128	dev->priv_flags \|= IFF_NO_QUEUE;
	129
	130	dev->netdev_ops = &vsockmon_ops;
	131	dev->ethtool_ops = &vsockmon_ethtool_ops;
cf124db5	132	dev->needs_free_netdev = true;
0b2e6644 GG	133
	134	dev->features = NETIF_F_SG \| NETIF_F_FRAGLIST \|
	135	NETIF_F_HIGHDMA \| NETIF_F_LLTX;
	136
	137	dev->flags = IFF_NOARP;
	138
	139	dev->mtu = DEFAULT_MTU;
	140	}
	141
	142	static struct rtnl_link_ops vsockmon_link_ops __read_mostly = {
	143	.kind = "vsockmon",
	144	.priv_size = sizeof(struct vsockmon),
	145	.setup = vsockmon_setup,
	146	};
	147
	148	static __init int vsockmon_register(void)
	149	{
	150	return rtnl_link_register(&vsockmon_link_ops);
	151	}
	152
	153	static __exit void vsockmon_unregister(void)
	154	{
	155	rtnl_link_unregister(&vsockmon_link_ops);
	156	}
	157
	158	module_init(vsockmon_register);
	159	module_exit(vsockmon_unregister);
	160
	161	MODULE_LICENSE("GPL v2");
	162	MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>");
	163	MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device.");
	164	MODULE_ALIAS_RTNL_LINK("vsockmon");