Release 4.10 drivers/net/dummy.c

Directory: drivers/net
/* dummy.c: a dummy net driver

        The purpose of this driver is to provide a device to point a
        route through, but not to actually transmit packets.

        Why?  If you have a machine whose only connection is an occasional
        PPP/SLIP/PLIP link, you can only connect to your own hostname
        when the link is up.  Otherwise you have to use localhost.
        This isn't very consistent.

        One solution is to set up a dummy link using PPP/SLIP/PLIP,
        but this seems (to me) too much overhead for too little gain.
        This driver provides a small alternative. Thus you can do

        [when not running slip]
                ifconfig dummy slip.addr.ess.here up
        [to go to slip]
                ifconfig dummy down
                dip whatever

        This was written by looking at Donald Becker's skeleton driver
        and the loopback driver.  I then threw away anything that didn't
        apply!  Thanks to Alan Cox for the key clue on what to do with
        misguided packets.

                        Nick Holloway, 27th May 1994
        [I tweaked this explanation a little but that's all]
                        Alan Cox, 30th May 1994
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/rtnetlink.h>
#include <net/rtnetlink.h>
#include <linux/u64_stats_sync.h>


#define DRV_NAME	"dummy"

#define DRV_VERSION	"1.0"


static int numdummies = 1;

/* fake multicast ability */


static void set_multicast_list(struct net_device *dev)
{
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 10 100.00% 2 100.00%
Total 10 100.00% 2 100.00%


struct pcpu_dstats {
	
u64			tx_packets;
	
u64			tx_bytes;
	
struct u64_stats_sync	syncp;
};



static struct rtnl_link_stats64 *dummy_get_stats64(struct net_device *dev,
						   struct rtnl_link_stats64 *stats)
{
	int i;

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

		dstats = per_cpu_ptr(dev->dstats, i);
		do {
			start = u64_stats_fetch_begin_irq(&dstats->syncp);
			tbytes = dstats->tx_bytes;
			tpackets = dstats->tx_packets;
		} while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
		stats->tx_bytes += tbytes;
		stats->tx_packets += tpackets;
	}
	return stats;
}

Contributors
Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 104 98.11% 1 50.00%
eric w. biederman eric w. biederman 2 1.89% 1 50.00%
Total 106 100.00% 2 100.00%



static netdev_tx_t dummy_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);

	u64_stats_update_begin(&dstats->syncp);
	dstats->tx_packets++;
	dstats->tx_bytes += skb->len;
	u64_stats_update_end(&dstats->syncp);

	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

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Person Tokens Prop Commits CommitProp
stephen hemminger stephen hemminger 36 55.38% 1 50.00%
eric dumazet eric dumazet 29 44.62% 1 50.00%
Total 65 100.00% 2 100.00%



static int dummy_dev_init(struct net_device *dev)
{
	dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
	if (!dev->dstats)
		return -ENOMEM;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 34 97.14% 1 50.00%
americo wang americo wang 1 2.86% 1 50.00%
Total 35 100.00% 2 100.00%



static void dummy_dev_uninit(struct net_device *dev)
{
	free_percpu(dev->dstats);
}

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Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 17 94.44% 1 50.00%
hiroaki shimoda hiroaki shimoda 1 5.56% 1 50.00%
Total 18 100.00% 2 100.00%



static int dummy_change_carrier(struct net_device *dev, bool new_carrier)
{
	if (new_carrier)
		netif_carrier_on(dev);
	else
		netif_carrier_off(dev);
	return 0;
}

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jiri pirko jiri pirko 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%


static const struct net_device_ops dummy_netdev_ops = {
	.ndo_init		= dummy_dev_init,
	.ndo_uninit		= dummy_dev_uninit,
	.ndo_start_xmit		= dummy_xmit,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_rx_mode	= set_multicast_list,
	.ndo_set_mac_address	= eth_mac_addr,
	.ndo_get_stats64	= dummy_get_stats64,
	.ndo_change_carrier	= dummy_change_carrier,
};



static void dummy_get_drvinfo(struct net_device *dev,
			      struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
}

Contributors
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flavio leitner flavio leitner 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%


static const struct ethtool_ops dummy_ethtool_ops = {
	.get_drvinfo            = dummy_get_drvinfo,
};



static void dummy_setup(struct net_device *dev)
{
	ether_setup(dev);

	/* Initialize the device structure. */
	dev->netdev_ops = &dummy_netdev_ops;
	dev->ethtool_ops = &dummy_ethtool_ops;
	dev->destructor = free_netdev;

	/* Fill in device structure with ethernet-generic values. */
	dev->flags |= IFF_NOARP;
	dev->flags &= ~IFF_MULTICAST;
	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
	dev->features	|= NETIF_F_SG | NETIF_F_FRAGLIST;
	dev->features	|= NETIF_F_ALL_TSO | NETIF_F_UFO;
	dev->features	|= NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_LLTX;
	dev->features	|= NETIF_F_GSO_ENCAP_ALL;
	dev->hw_features |= dev->features;
	dev->hw_enc_features |= dev->features;
	eth_hw_addr_random(dev);

	dev->min_mtu = 0;
	dev->max_mtu = ETH_MAX_MTU;
}

Contributors
Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 47 37.90% 2 9.09%
pre-git pre-git 23 18.55% 8 36.36%
stephen hemminger stephen hemminger 17 13.71% 3 13.64%
zhang shengju zhang shengju 12 9.68% 1 4.55%
flavio leitner flavio leitner 7 5.65% 1 4.55%
jiri pirko jiri pirko 6 4.84% 1 4.55%
patrick mchardy patrick mchardy 5 4.03% 1 4.55%
phil sutter phil sutter 2 1.61% 1 4.55%
linus torvalds linus torvalds 2 1.61% 1 4.55%
hiroaki shimoda hiroaki shimoda 1 0.81% 1 4.55%
michal miroslaw michal miroslaw 1 0.81% 1 4.55%
danny kukawka danny kukawka 1 0.81% 1 4.55%
Total 124 100.00% 22 100.00%



static int dummy_validate(struct nlattr *tb[], struct nlattr *data[])
{
	if (tb[IFLA_ADDRESS]) {
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
			return -EINVAL;
		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
			return -EADDRNOTAVAIL;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 64 100.00% 1 100.00%
Total 64 100.00% 1 100.00%


static struct rtnl_link_ops dummy_link_ops __read_mostly = {
	.kind		= DRV_NAME,
	.setup		= dummy_setup,
	.validate	= dummy_validate,
};

/* Number of dummy devices to be set up by this module. */
module_param(numdummies, int, 0);
MODULE_PARM_DESC(numdummies, "Number of dummy pseudo devices");



static int __init dummy_init_one(void)
{
	struct net_device *dev_dummy;
	int err;

	dev_dummy = alloc_netdev(0, "dummy%d", NET_NAME_UNKNOWN, dummy_setup);
	if (!dev_dummy)
		return -ENOMEM;

	dev_dummy->rtnl_link_ops = &dummy_link_ops;
	err = register_netdevice(dev_dummy);
	if (err < 0)
		goto err;
	return 0;

err:
	free_netdev(dev_dummy);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
patrick mchardy patrick mchardy 29 38.67% 3 23.08%
pre-git pre-git 26 34.67% 6 46.15%
stephen hemminger stephen hemminger 11 14.67% 2 15.38%
andi kleen andi kleen 7 9.33% 1 7.69%
tom gundersen tom gundersen 2 2.67% 1 7.69%
Total 75 100.00% 13 100.00%



static int __init dummy_init_module(void)
{
	int i, err = 0;

	rtnl_lock();
	err = __rtnl_link_register(&dummy_link_ops);
	if (err < 0)
		goto out;

	for (i = 0; i < numdummies && !err; i++) {
		err = dummy_init_one();
		cond_resched();
	}
	if (err < 0)
		__rtnl_link_unregister(&dummy_link_ops);

out:
	rtnl_unlock();

	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
andi kleen andi kleen 43 52.44% 1 20.00%
patrick mchardy patrick mchardy 23 28.05% 2 40.00%
ding tianhong ding tianhong 11 13.41% 1 20.00%
eric dumazet eric dumazet 5 6.10% 1 20.00%
Total 82 100.00% 5 100.00%



static void __exit dummy_cleanup_module(void)
{
	rtnl_link_unregister(&dummy_link_ops);
}

Contributors
Person Tokens Prop Commits CommitProp
andi kleen andi kleen 8 53.33% 1 25.00%
patrick mchardy patrick mchardy 6 40.00% 2 50.00%
pre-git pre-git 1 6.67% 1 25.00%
Total 15 100.00% 4 100.00%


module_init(dummy_init_module);

module_exit(dummy_cleanup_module);
MODULE_LICENSE("GPL");

MODULE_ALIAS_RTNL_LINK(DRV_NAME);

MODULE_VERSION(DRV_VERSION);
Overall Contributors
Person Tokens Prop Commits CommitProp
eric dumazet eric dumazet 264 30.77% 3 6.82%
patrick mchardy patrick mchardy 159 18.53% 4 9.09%
stephen hemminger stephen hemminger 98 11.42% 5 11.36%
pre-git pre-git 83 9.67% 13 29.55%
flavio leitner flavio leitner 83 9.67% 2 4.55%
andi kleen andi kleen 77 8.97% 1 2.27%
jiri pirko jiri pirko 45 5.24% 3 6.82%
zhang shengju zhang shengju 12 1.40% 1 2.27%
ding tianhong ding tianhong 11 1.28% 1 2.27%
hiroaki shimoda hiroaki shimoda 7 0.82% 1 2.27%
linus torvalds linus torvalds 7 0.82% 2 4.55%
phil sutter phil sutter 2 0.23% 1 2.27%
tom gundersen tom gundersen 2 0.23% 1 2.27%
rusty russell rusty russell 2 0.23% 1 2.27%
eric w. biederman eric w. biederman 2 0.23% 1 2.27%
jeff garzik jeff garzik 1 0.12% 1 2.27%
americo wang americo wang 1 0.12% 1 2.27%
michal miroslaw michal miroslaw 1 0.12% 1 2.27%
danny kukawka danny kukawka 1 0.12% 1 2.27%
Total 858 100.00% 44 100.00%
Directory: drivers/net

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pre-git	pre-git	10	100.00%	2	100.00%
	Total	10	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 drivers/net/dummy.c

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