Release 4.16 drivers/net/dummy.c
/* 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 <linux/net_tstamp.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 |
| Linus Torvalds (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 void 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;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Dumazet | 98 | 97.03% | 1 | 33.33% |
| Eric W. Biedermann | 2 | 1.98% | 1 | 33.33% |
| Stephen Hemminger | 1 | 0.99% | 1 | 33.33% |
| Total | 101 | 100.00% | 3 | 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);
skb_tx_timestamp(skb);
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Dumazet | 32 | 45.71% | 1 | 25.00% |
| Stephen Hemminger | 27 | 38.57% | 1 | 25.00% |
| Jakub Kiciński | 10 | 14.29% | 1 | 25.00% |
| Phil Sutter | 1 | 1.43% | 1 | 25.00% |
| Total | 70 | 100.00% | 4 | 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 |
| Jakub Kiciński | 18 | 51.43% | 1 | 25.00% |
| Eric Dumazet | 8 | 22.86% | 1 | 25.00% |
| Phil Sutter | 5 | 14.29% | 1 | 25.00% |
| Jiri Pirko | 4 | 11.43% | 1 | 25.00% |
| Total | 35 | 100.00% | 4 | 100.00% |
static void dummy_dev_uninit(struct net_device *dev)
{
free_percpu(dev->dstats);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jakub Kiciński | 17 | 94.44% | 1 | 50.00% |
| Phil Sutter | 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jakub Kiciński | 27 | 84.38% | 1 | 50.00% |
| Jiri Pirko | 5 | 15.62% | 1 | 50.00% |
| Total | 32 | 100.00% | 2 | 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
| Person | Tokens | Prop | Commits | CommitProp |
| Flavio Leitner | 48 | 100.00% | 1 | 100.00% |
| Total | 48 | 100.00% | 1 | 100.00% |
static int dummy_get_ts_info(struct net_device *dev,
struct ethtool_ts_info *ts_info)
{
ts_info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_RX_SOFTWARE |
SOF_TIMESTAMPING_SOFTWARE;
ts_info->phc_index = -1;
return 0;
}Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ezequiel Lara Gomez | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
;
static const struct ethtool_ops dummy_ethtool_ops = {
.get_drvinfo = dummy_get_drvinfo,
.get_ts_info = dummy_get_ts_info,
};
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->needs_free_netdev = true;
/* 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;
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 = 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Dumazet | 45 | 36.89% | 2 | 8.70% |
| Linus Torvalds (pre-git) | 23 | 18.85% | 8 | 34.78% |
| Stephen Hemminger | 17 | 13.93% | 3 | 13.04% |
| Zhang Shengju | 12 | 9.84% | 2 | 8.70% |
| Flavio Leitner | 7 | 5.74% | 1 | 4.35% |
| Jiri Pirko | 6 | 4.92% | 1 | 4.35% |
| David S. Miller | 4 | 3.28% | 1 | 4.35% |
| Linus Torvalds | 2 | 1.64% | 1 | 4.35% |
| Patrick McHardy | 2 | 1.64% | 1 | 4.35% |
| Phil Sutter | 2 | 1.64% | 1 | 4.35% |
| Michał Mirosław | 1 | 0.82% | 1 | 4.35% |
| Danny Kukawka | 1 | 0.82% | 1 | 4.35% |
| Total | 122 | 100.00% | 23 | 100.00% |
static int dummy_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
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 | 64 | 92.75% | 1 | 50.00% |
| Matthias Schiffer | 5 | 7.25% | 1 | 50.00% |
| Total | 69 | 100.00% | 2 | 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_ENUM, 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 | 28 | 37.33% | 2 | 14.29% |
| Linus Torvalds (pre-git) | 26 | 34.67% | 6 | 42.86% |
| Stephen Hemminger | 11 | 14.67% | 2 | 14.29% |
| Andi Kleen | 7 | 9.33% | 1 | 7.14% |
| Tom Gundersen | 1 | 1.33% | 1 | 7.14% |
| Zhang Shengju | 1 | 1.33% | 1 | 7.14% |
| Jakub Kiciński | 1 | 1.33% | 1 | 7.14% |
| Total | 75 | 100.00% | 14 | 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 | 43 | 52.44% | 1 | 20.00% |
| Patrick McHardy | 23 | 28.05% | 2 | 40.00% |
| Ding Tianhong | 11 | 13.41% | 1 | 20.00% |
| 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 | 8 | 53.33% | 1 | 25.00% |
| Patrick McHardy | 6 | 40.00% | 2 | 50.00% |
| Linus Torvalds (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 | 216 | 23.84% | 3 | 5.88% |
| Patrick McHardy | 155 | 17.11% | 4 | 7.84% |
| Stephen Hemminger | 90 | 9.93% | 6 | 11.76% |
| Linus Torvalds (pre-git) | 83 | 9.16% | 13 | 25.49% |
| Flavio Leitner | 83 | 9.16% | 2 | 3.92% |
| Andi Kleen | 77 | 8.50% | 1 | 1.96% |
| Jakub Kiciński | 73 | 8.06% | 1 | 1.96% |
| Ezequiel Lara Gomez | 45 | 4.97% | 1 | 1.96% |
| Jiri Pirko | 22 | 2.43% | 3 | 5.88% |
| Zhang Shengju | 13 | 1.43% | 3 | 5.88% |
| Ding Tianhong | 11 | 1.21% | 1 | 1.96% |
| Phil Sutter | 9 | 0.99% | 2 | 3.92% |
| Linus Torvalds | 7 | 0.77% | 2 | 3.92% |
| Hiroaki SHIMODA | 5 | 0.55% | 1 | 1.96% |
| Matthias Schiffer | 5 | 0.55% | 1 | 1.96% |
| David S. Miller | 4 | 0.44% | 1 | 1.96% |
| Rusty Russell | 2 | 0.22% | 1 | 1.96% |
| Eric W. Biedermann | 2 | 0.22% | 1 | 1.96% |
| Danny Kukawka | 1 | 0.11% | 1 | 1.96% |
| Jeff Garzik | 1 | 0.11% | 1 | 1.96% |
| Tom Gundersen | 1 | 0.11% | 1 | 1.96% |
| Michał Mirosław | 1 | 0.11% | 1 | 1.96% |
| Total | 906 | 100.00% | 51 | 100.00% |
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