2005-04-16 16:20:36 -06:00
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/* dummy.c: a dummy net driver
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The purpose of this driver is to provide a device to point a
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route through, but not to actually transmit packets.
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Why? If you have a machine whose only connection is an occasional
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PPP/SLIP/PLIP link, you can only connect to your own hostname
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when the link is up. Otherwise you have to use localhost.
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This isn't very consistent.
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One solution is to set up a dummy link using PPP/SLIP/PLIP,
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but this seems (to me) too much overhead for too little gain.
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This driver provides a small alternative. Thus you can do
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2006-09-13 11:24:59 -06:00
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2005-04-16 16:20:36 -06:00
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[when not running slip]
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ifconfig dummy slip.addr.ess.here up
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[to go to slip]
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ifconfig dummy down
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dip whatever
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This was written by looking at Donald Becker's skeleton driver
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and the loopback driver. I then threw away anything that didn't
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apply! Thanks to Alan Cox for the key clue on what to do with
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misguided packets.
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Nick Holloway, 27th May 1994
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[I tweaked this explanation a little but that's all]
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Alan Cox, 30th May 1994
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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2007-06-13 13:04:20 -06:00
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#include <linux/rtnetlink.h>
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2017-03-11 13:06:54 -07:00
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#include <linux/net_tstamp.h>
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2007-06-13 13:04:34 -06:00
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#include <net/rtnetlink.h>
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2010-09-27 14:50:33 -06:00
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#include <linux/u64_stats_sync.h>
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2007-06-13 13:04:20 -06:00
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2014-12-05 17:13:24 -07:00
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#define DRV_NAME "dummy"
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#define DRV_VERSION "1.0"
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2017-01-23 04:17:33 -07:00
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#undef pr_fmt
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#define pr_fmt(fmt) DRV_NAME ": " fmt
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2005-04-16 16:20:36 -06:00
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static int numdummies = 1;
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2017-01-23 04:17:33 -07:00
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static int num_vfs;
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struct vf_data_storage {
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u8 vf_mac[ETH_ALEN];
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u16 pf_vlan; /* When set, guest VLAN config not allowed. */
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u16 pf_qos;
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__be16 vlan_proto;
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u16 min_tx_rate;
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u16 max_tx_rate;
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u8 spoofchk_enabled;
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bool rss_query_enabled;
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u8 trusted;
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int link_state;
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};
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struct dummy_priv {
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struct vf_data_storage *vfinfo;
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};
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static int dummy_num_vf(struct device *dev)
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{
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return num_vfs;
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}
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static struct bus_type dummy_bus = {
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.name = "dummy",
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.num_vf = dummy_num_vf,
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};
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static void release_dummy_parent(struct device *dev)
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{
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}
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static struct device dummy_parent = {
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.init_name = "dummy",
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.bus = &dummy_bus,
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.release = release_dummy_parent,
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};
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2005-04-16 16:20:36 -06:00
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/* fake multicast ability */
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static void set_multicast_list(struct net_device *dev)
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{
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}
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2010-09-27 14:50:33 -06:00
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struct pcpu_dstats {
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u64 tx_packets;
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u64 tx_bytes;
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struct u64_stats_sync syncp;
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};
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2017-01-06 20:12:52 -07:00
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static void dummy_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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2010-09-27 14:50:33 -06:00
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{
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int i;
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for_each_possible_cpu(i) {
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const struct pcpu_dstats *dstats;
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u64 tbytes, tpackets;
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unsigned int start;
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dstats = per_cpu_ptr(dev->dstats, i);
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do {
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2014-03-13 22:26:42 -06:00
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start = u64_stats_fetch_begin_irq(&dstats->syncp);
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2010-09-27 14:50:33 -06:00
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tbytes = dstats->tx_bytes;
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tpackets = dstats->tx_packets;
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2014-03-13 22:26:42 -06:00
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} while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
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2010-09-27 14:50:33 -06:00
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stats->tx_bytes += tbytes;
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stats->tx_packets += tpackets;
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}
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}
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2009-08-31 13:50:51 -06:00
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static netdev_tx_t dummy_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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2010-09-27 14:50:33 -06:00
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struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
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u64_stats_update_begin(&dstats->syncp);
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dstats->tx_packets++;
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dstats->tx_bytes += skb->len;
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u64_stats_update_end(&dstats->syncp);
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2009-08-31 13:50:51 -06:00
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2017-03-11 13:06:54 -07:00
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skb_tx_timestamp(skb);
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2009-08-31 13:50:51 -06:00
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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2010-09-27 14:50:33 -06:00
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static int dummy_dev_init(struct net_device *dev)
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{
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2017-01-23 04:17:33 -07:00
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struct dummy_priv *priv = netdev_priv(dev);
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2014-02-13 12:46:28 -07:00
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dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
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2010-09-27 14:50:33 -06:00
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if (!dev->dstats)
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return -ENOMEM;
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2017-01-23 04:17:33 -07:00
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priv->vfinfo = NULL;
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if (!num_vfs)
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return 0;
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dev->dev.parent = &dummy_parent;
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priv->vfinfo = kcalloc(num_vfs, sizeof(struct vf_data_storage),
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GFP_KERNEL);
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if (!priv->vfinfo) {
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free_percpu(dev->dstats);
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return -ENOMEM;
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}
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2010-09-27 14:50:33 -06:00
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return 0;
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}
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2012-04-15 07:26:01 -06:00
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static void dummy_dev_uninit(struct net_device *dev)
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2010-09-27 14:50:33 -06:00
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{
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free_percpu(dev->dstats);
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}
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2012-12-27 16:49:40 -07:00
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static int dummy_change_carrier(struct net_device *dev, bool new_carrier)
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{
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if (new_carrier)
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netif_carrier_on(dev);
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else
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netif_carrier_off(dev);
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return 0;
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}
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2017-01-23 04:17:33 -07:00
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static int dummy_set_vf_mac(struct net_device *dev, int vf, u8 *mac)
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{
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struct dummy_priv *priv = netdev_priv(dev);
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if (!is_valid_ether_addr(mac) || (vf >= num_vfs))
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return -EINVAL;
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memcpy(priv->vfinfo[vf].vf_mac, mac, ETH_ALEN);
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return 0;
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}
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static int dummy_set_vf_vlan(struct net_device *dev, int vf,
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u16 vlan, u8 qos, __be16 vlan_proto)
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{
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struct dummy_priv *priv = netdev_priv(dev);
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if ((vf >= num_vfs) || (vlan > 4095) || (qos > 7))
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return -EINVAL;
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priv->vfinfo[vf].pf_vlan = vlan;
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priv->vfinfo[vf].pf_qos = qos;
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priv->vfinfo[vf].vlan_proto = vlan_proto;
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return 0;
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}
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static int dummy_set_vf_rate(struct net_device *dev, int vf, int min, int max)
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{
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struct dummy_priv *priv = netdev_priv(dev);
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if (vf >= num_vfs)
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return -EINVAL;
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priv->vfinfo[vf].min_tx_rate = min;
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priv->vfinfo[vf].max_tx_rate = max;
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return 0;
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}
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static int dummy_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
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{
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struct dummy_priv *priv = netdev_priv(dev);
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if (vf >= num_vfs)
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return -EINVAL;
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priv->vfinfo[vf].spoofchk_enabled = val;
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return 0;
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}
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static int dummy_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
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{
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struct dummy_priv *priv = netdev_priv(dev);
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if (vf >= num_vfs)
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return -EINVAL;
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priv->vfinfo[vf].rss_query_enabled = val;
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return 0;
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}
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static int dummy_set_vf_trust(struct net_device *dev, int vf, bool val)
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{
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struct dummy_priv *priv = netdev_priv(dev);
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if (vf >= num_vfs)
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return -EINVAL;
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priv->vfinfo[vf].trusted = val;
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return 0;
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}
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static int dummy_get_vf_config(struct net_device *dev,
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int vf, struct ifla_vf_info *ivi)
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{
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struct dummy_priv *priv = netdev_priv(dev);
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if (vf >= num_vfs)
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return -EINVAL;
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ivi->vf = vf;
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memcpy(&ivi->mac, priv->vfinfo[vf].vf_mac, ETH_ALEN);
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ivi->vlan = priv->vfinfo[vf].pf_vlan;
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ivi->qos = priv->vfinfo[vf].pf_qos;
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ivi->spoofchk = priv->vfinfo[vf].spoofchk_enabled;
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ivi->linkstate = priv->vfinfo[vf].link_state;
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ivi->min_tx_rate = priv->vfinfo[vf].min_tx_rate;
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ivi->max_tx_rate = priv->vfinfo[vf].max_tx_rate;
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ivi->rss_query_en = priv->vfinfo[vf].rss_query_enabled;
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ivi->trusted = priv->vfinfo[vf].trusted;
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ivi->vlan_proto = priv->vfinfo[vf].vlan_proto;
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return 0;
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}
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static int dummy_set_vf_link_state(struct net_device *dev, int vf, int state)
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{
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struct dummy_priv *priv = netdev_priv(dev);
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if (vf >= num_vfs)
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return -EINVAL;
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priv->vfinfo[vf].link_state = state;
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return 0;
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}
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2008-11-20 21:28:00 -07:00
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static const struct net_device_ops dummy_netdev_ops = {
|
2010-09-27 14:50:33 -06:00
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.ndo_init = dummy_dev_init,
|
2012-04-15 07:26:01 -06:00
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.ndo_uninit = dummy_dev_uninit,
|
2008-11-20 21:28:00 -07:00
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.ndo_start_xmit = dummy_xmit,
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.ndo_validate_addr = eth_validate_addr,
|
2011-08-16 00:29:01 -06:00
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.ndo_set_rx_mode = set_multicast_list,
|
2012-06-28 23:10:08 -06:00
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.ndo_set_mac_address = eth_mac_addr,
|
2010-09-27 14:50:33 -06:00
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.ndo_get_stats64 = dummy_get_stats64,
|
2012-12-27 16:49:40 -07:00
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.ndo_change_carrier = dummy_change_carrier,
|
2017-01-23 04:17:33 -07:00
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.ndo_set_vf_mac = dummy_set_vf_mac,
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.ndo_set_vf_vlan = dummy_set_vf_vlan,
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.ndo_set_vf_rate = dummy_set_vf_rate,
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.ndo_set_vf_spoofchk = dummy_set_vf_spoofchk,
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.ndo_set_vf_trust = dummy_set_vf_trust,
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.ndo_get_vf_config = dummy_get_vf_config,
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.ndo_set_vf_link_state = dummy_set_vf_link_state,
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.ndo_set_vf_rss_query_en = dummy_set_vf_rss_query_en,
|
2008-11-20 21:28:00 -07:00
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};
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|
2014-12-05 17:13:24 -07:00
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static void dummy_get_drvinfo(struct net_device *dev,
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struct ethtool_drvinfo *info)
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|
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{
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|
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strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
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|
|
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
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|
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}
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|
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|
2017-03-11 13:06:54 -07:00
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|
|
static int dummy_get_ts_info(struct net_device *dev,
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|
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struct ethtool_ts_info *ts_info)
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|
|
|
{
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|
|
|
ts_info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
|
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|
|
SOF_TIMESTAMPING_RX_SOFTWARE |
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|
|
SOF_TIMESTAMPING_SOFTWARE;
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|
|
ts_info->phc_index = -1;
|
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|
|
return 0;
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|
|
|
};
|
|
|
|
|
2014-12-05 17:13:24 -07:00
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|
|
static const struct ethtool_ops dummy_ethtool_ops = {
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|
|
|
.get_drvinfo = dummy_get_drvinfo,
|
2017-03-11 13:06:54 -07:00
|
|
|
.get_ts_info = dummy_get_ts_info,
|
2014-12-05 17:13:24 -07:00
|
|
|
};
|
|
|
|
|
2017-01-23 04:17:33 -07:00
|
|
|
static void dummy_free_netdev(struct net_device *dev)
|
|
|
|
{
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|
|
|
struct dummy_priv *priv = netdev_priv(dev);
|
|
|
|
|
|
|
|
kfree(priv->vfinfo);
|
|
|
|
free_netdev(dev);
|
|
|
|
}
|
|
|
|
|
2007-06-13 13:04:34 -06:00
|
|
|
static void dummy_setup(struct net_device *dev)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-11-20 21:28:00 -07:00
|
|
|
ether_setup(dev);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Initialize the device structure. */
|
2008-11-20 21:28:00 -07:00
|
|
|
dev->netdev_ops = &dummy_netdev_ops;
|
2014-12-05 17:13:24 -07:00
|
|
|
dev->ethtool_ops = &dummy_ethtool_ops;
|
2017-01-23 04:17:33 -07:00
|
|
|
dev->destructor = dummy_free_netdev;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Fill in device structure with ethernet-generic values. */
|
|
|
|
dev->flags |= IFF_NOARP;
|
|
|
|
dev->flags &= ~IFF_MULTICAST;
|
2015-08-18 02:30:30 -06:00
|
|
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
|
2015-10-19 21:17:59 -06:00
|
|
|
dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST;
|
|
|
|
dev->features |= NETIF_F_ALL_TSO | NETIF_F_UFO;
|
2011-11-15 08:29:55 -07:00
|
|
|
dev->features |= NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_LLTX;
|
2015-10-19 21:17:59 -06:00
|
|
|
dev->features |= NETIF_F_GSO_ENCAP_ALL;
|
|
|
|
dev->hw_features |= dev->features;
|
|
|
|
dev->hw_enc_features |= dev->features;
|
2012-02-14 23:45:40 -07:00
|
|
|
eth_hw_addr_random(dev);
|
2016-12-07 02:41:33 -07:00
|
|
|
|
|
|
|
dev->min_mtu = 0;
|
|
|
|
dev->max_mtu = ETH_MAX_MTU;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2010-09-27 14:50:33 -06:00
|
|
|
|
2007-07-11 20:42:31 -06:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2007-06-13 13:04:34 -06:00
|
|
|
static struct rtnl_link_ops dummy_link_ops __read_mostly = {
|
2014-12-05 17:13:24 -07:00
|
|
|
.kind = DRV_NAME,
|
2017-01-23 04:17:33 -07:00
|
|
|
.priv_size = sizeof(struct dummy_priv),
|
2007-06-13 13:04:34 -06:00
|
|
|
.setup = dummy_setup,
|
2007-07-11 20:42:31 -06:00
|
|
|
.validate = dummy_validate,
|
2007-06-13 13:04:34 -06:00
|
|
|
};
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* 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");
|
|
|
|
|
2017-01-23 04:17:33 -07:00
|
|
|
module_param(num_vfs, int, 0);
|
|
|
|
MODULE_PARM_DESC(num_vfs, "Number of dummy VFs per dummy device");
|
|
|
|
|
2007-06-13 13:04:20 -06:00
|
|
|
static int __init dummy_init_one(void)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct net_device *dev_dummy;
|
|
|
|
int err;
|
|
|
|
|
2017-01-23 04:17:33 -07:00
|
|
|
dev_dummy = alloc_netdev(sizeof(struct dummy_priv),
|
|
|
|
"dummy%d", NET_NAME_UNKNOWN, dummy_setup);
|
2005-04-16 16:20:36 -06:00
|
|
|
if (!dev_dummy)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2007-06-13 13:04:34 -06:00
|
|
|
dev_dummy->rtnl_link_ops = &dummy_link_ops;
|
|
|
|
err = register_netdevice(dev_dummy);
|
|
|
|
if (err < 0)
|
|
|
|
goto err;
|
|
|
|
return 0;
|
2007-06-13 13:04:20 -06:00
|
|
|
|
2007-06-13 13:04:34 -06:00
|
|
|
err:
|
|
|
|
free_netdev(dev_dummy);
|
|
|
|
return err;
|
2006-09-13 11:24:59 -06:00
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
static int __init dummy_init_module(void)
|
2006-09-13 11:24:59 -06:00
|
|
|
{
|
2005-04-16 16:20:36 -06:00
|
|
|
int i, err = 0;
|
2007-06-13 13:04:20 -06:00
|
|
|
|
2017-01-23 04:17:33 -07:00
|
|
|
if (num_vfs) {
|
|
|
|
err = bus_register(&dummy_bus);
|
|
|
|
if (err < 0) {
|
|
|
|
pr_err("registering dummy bus failed\n");
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
err = device_register(&dummy_parent);
|
|
|
|
if (err < 0) {
|
|
|
|
pr_err("registering dummy parent device failed\n");
|
|
|
|
bus_unregister(&dummy_bus);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-06-13 13:04:34 -06:00
|
|
|
rtnl_lock();
|
|
|
|
err = __rtnl_link_register(&dummy_link_ops);
|
2013-07-11 05:04:02 -06:00
|
|
|
if (err < 0)
|
|
|
|
goto out;
|
2007-06-13 13:04:34 -06:00
|
|
|
|
2012-06-10 15:11:57 -06:00
|
|
|
for (i = 0; i < numdummies && !err; i++) {
|
2007-06-13 13:04:20 -06:00
|
|
|
err = dummy_init_one();
|
2012-06-10 15:11:57 -06:00
|
|
|
cond_resched();
|
|
|
|
}
|
2007-07-11 20:42:13 -06:00
|
|
|
if (err < 0)
|
2007-06-13 13:04:34 -06:00
|
|
|
__rtnl_link_unregister(&dummy_link_ops);
|
2013-07-11 05:04:02 -06:00
|
|
|
|
|
|
|
out:
|
2007-06-13 13:04:34 -06:00
|
|
|
rtnl_unlock();
|
|
|
|
|
2017-01-23 04:17:33 -07:00
|
|
|
if (err && num_vfs) {
|
|
|
|
device_unregister(&dummy_parent);
|
|
|
|
bus_unregister(&dummy_bus);
|
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
return err;
|
2006-09-13 11:24:59 -06:00
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
static void __exit dummy_cleanup_module(void)
|
|
|
|
{
|
2007-07-11 20:42:13 -06:00
|
|
|
rtnl_link_unregister(&dummy_link_ops);
|
2017-01-23 04:17:33 -07:00
|
|
|
|
|
|
|
if (num_vfs) {
|
|
|
|
device_unregister(&dummy_parent);
|
|
|
|
bus_unregister(&dummy_bus);
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(dummy_init_module);
|
|
|
|
module_exit(dummy_cleanup_module);
|
|
|
|
MODULE_LICENSE("GPL");
|
2014-12-05 17:13:24 -07:00
|
|
|
MODULE_ALIAS_RTNL_LINK(DRV_NAME);
|
2014-12-09 17:41:48 -07:00
|
|
|
MODULE_VERSION(DRV_VERSION);
|