Commit e1636836 authored by Phil Sutter's avatar Phil Sutter Committed by David S. Miller
Browse files

net: dummy: Introduce dummy virtual functions 



The idea for this was born when testing VF support in iproute2 which was
impeded by hardware requirements. In fact, not every VF-capable hardware
driver implements all netdev ops, so testing the interface is still hard
to do even with a well-sorted hardware shelf.

To overcome this and allow for testing the user-kernel interface, this
patch allows to turn dummy into a PF with a configurable amount of VFs.

Since my patch series 'bus-agnostic-num-vf' has been accepted,
implementing the required interfaces is pretty straightforward: Iff
'num_vfs' module parameter was given a value >0, a dummy bus type is
being registered which implements the 'num_vf()' callback. Additionally,
a dummy parent device common to all dummy devices is registered which
sits on the above dummy bus.

Joint work with Sabrina Dubroca.

Signed-off-by: default avatarSabrina Dubroca <sd@queasysnail.net>
Signed-off-by: default avatarPhil Sutter <phil@nwl.cc>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8b86b2c1

drivers/net/dummy.c

+215 −2
Original line number Diff line number Diff line
@@ -41,7 +41,48 @@ 
#define DRV_NAME	"dummy"

#define DRV_VERSION	"1.0"



#undef pr_fmt

#define pr_fmt(fmt) DRV_NAME ": " fmt



static int numdummies = 1;

static int num_vfs;



struct vf_data_storage {

	u8	vf_mac[ETH_ALEN];

	u16	pf_vlan; /* When set, guest VLAN config not allowed. */

	u16	pf_qos;

	__be16	vlan_proto;

	u16	min_tx_rate;

	u16	max_tx_rate;

	u8	spoofchk_enabled;

	bool	rss_query_enabled;

	u8	trusted;

	int	link_state;

};



struct dummy_priv {

	struct vf_data_storage	*vfinfo;

};



static int dummy_num_vf(struct device *dev)

{

	return num_vfs;

}



static struct bus_type dummy_bus = {

	.name	= "dummy",

	.num_vf	= dummy_num_vf,

};



static void release_dummy_parent(struct device *dev)

{

}



static struct device dummy_parent = {

	.init_name	= "dummy",

	.bus		= &dummy_bus,

	.release	= release_dummy_parent,

};



/* fake multicast ability */

static void set_multicast_list(struct net_device *dev)
@@ -90,10 +131,25 @@ static netdev_tx_t dummy_xmit(struct sk_buff *skb, struct net_device *dev) 


static int dummy_dev_init(struct net_device *dev)

{

	struct dummy_priv *priv = netdev_priv(dev);



	dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);

	if (!dev->dstats)

		return -ENOMEM;



	priv->vfinfo = NULL;



	if (!num_vfs)

		return 0;



	dev->dev.parent = &dummy_parent;

	priv->vfinfo = kcalloc(num_vfs, sizeof(struct vf_data_storage),

			       GFP_KERNEL);

	if (!priv->vfinfo) {

		free_percpu(dev->dstats);

		return -ENOMEM;

	}



	return 0;

}
@@ -111,6 +167,117 @@ static int dummy_change_carrier(struct net_device *dev, bool new_carrier) 
	return 0;

}



static int dummy_set_vf_mac(struct net_device *dev, int vf, u8 *mac)

{

	struct dummy_priv *priv = netdev_priv(dev);



	if (!is_valid_ether_addr(mac) || (vf >= num_vfs))

		return -EINVAL;



	memcpy(priv->vfinfo[vf].vf_mac, mac, ETH_ALEN);



	return 0;

}



static int dummy_set_vf_vlan(struct net_device *dev, int vf,

			     u16 vlan, u8 qos, __be16 vlan_proto)

{

	struct dummy_priv *priv = netdev_priv(dev);



	if ((vf >= num_vfs) || (vlan > 4095) || (qos > 7))

		return -EINVAL;



	priv->vfinfo[vf].pf_vlan = vlan;

	priv->vfinfo[vf].pf_qos = qos;

	priv->vfinfo[vf].vlan_proto = vlan_proto;



	return 0;

}



static int dummy_set_vf_rate(struct net_device *dev, int vf, int min, int max)

{

	struct dummy_priv *priv = netdev_priv(dev);



	if (vf >= num_vfs)

		return -EINVAL;



	priv->vfinfo[vf].min_tx_rate = min;

	priv->vfinfo[vf].max_tx_rate = max;



	return 0;

}



static int dummy_set_vf_spoofchk(struct net_device *dev, int vf, bool val)

{

	struct dummy_priv *priv = netdev_priv(dev);



	if (vf >= num_vfs)

		return -EINVAL;



	priv->vfinfo[vf].spoofchk_enabled = val;



	return 0;

}



static int dummy_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)

{

	struct dummy_priv *priv = netdev_priv(dev);



	if (vf >= num_vfs)

		return -EINVAL;



	priv->vfinfo[vf].rss_query_enabled = val;



	return 0;

}



static int dummy_set_vf_trust(struct net_device *dev, int vf, bool val)

{

	struct dummy_priv *priv = netdev_priv(dev);



	if (vf >= num_vfs)

		return -EINVAL;



	priv->vfinfo[vf].trusted = val;



	return 0;

}



static int dummy_get_vf_config(struct net_device *dev,

			       int vf, struct ifla_vf_info *ivi)

{

	struct dummy_priv *priv = netdev_priv(dev);



	if (vf >= num_vfs)

		return -EINVAL;



	ivi->vf = vf;

	memcpy(&ivi->mac, priv->vfinfo[vf].vf_mac, ETH_ALEN);

	ivi->vlan = priv->vfinfo[vf].pf_vlan;

	ivi->qos = priv->vfinfo[vf].pf_qos;

	ivi->spoofchk = priv->vfinfo[vf].spoofchk_enabled;

	ivi->linkstate = priv->vfinfo[vf].link_state;

	ivi->min_tx_rate = priv->vfinfo[vf].min_tx_rate;

	ivi->max_tx_rate = priv->vfinfo[vf].max_tx_rate;

	ivi->rss_query_en = priv->vfinfo[vf].rss_query_enabled;

	ivi->trusted = priv->vfinfo[vf].trusted;

	ivi->vlan_proto = priv->vfinfo[vf].vlan_proto;



	return 0;

}



static int dummy_set_vf_link_state(struct net_device *dev, int vf, int state)

{

	struct dummy_priv *priv = netdev_priv(dev);



	if (vf >= num_vfs)

		return -EINVAL;



	priv->vfinfo[vf].link_state = state;



	return 0;

}



static const struct net_device_ops dummy_netdev_ops = {

	.ndo_init		= dummy_dev_init,

	.ndo_uninit		= dummy_dev_uninit,
@@ -120,6 +287,14 @@ static const struct net_device_ops dummy_netdev_ops = { 
	.ndo_set_mac_address	= eth_mac_addr,

	.ndo_get_stats64	= dummy_get_stats64,

	.ndo_change_carrier	= dummy_change_carrier,

	.ndo_set_vf_mac		= dummy_set_vf_mac,

	.ndo_set_vf_vlan	= dummy_set_vf_vlan,

	.ndo_set_vf_rate	= dummy_set_vf_rate,

	.ndo_set_vf_spoofchk	= dummy_set_vf_spoofchk,

	.ndo_set_vf_trust	= dummy_set_vf_trust,

	.ndo_get_vf_config	= dummy_get_vf_config,

	.ndo_set_vf_link_state	= dummy_set_vf_link_state,

	.ndo_set_vf_rss_query_en = dummy_set_vf_rss_query_en,

};



static void dummy_get_drvinfo(struct net_device *dev,
@@ -133,6 +308,14 @@ static const struct ethtool_ops dummy_ethtool_ops = { 
	.get_drvinfo            = dummy_get_drvinfo,

};



static void dummy_free_netdev(struct net_device *dev)

{

	struct dummy_priv *priv = netdev_priv(dev);



	kfree(priv->vfinfo);

	free_netdev(dev);

}



static void dummy_setup(struct net_device *dev)

{

	ether_setup(dev);
@@ -140,7 +323,7 @@ static void dummy_setup(struct net_device *dev) 
	/* Initialize the device structure. */

	dev->netdev_ops = &dummy_netdev_ops;

	dev->ethtool_ops = &dummy_ethtool_ops;

	dev->destructor = free_netdev;

	dev->destructor = dummy_free_netdev;



	/* Fill in device structure with ethernet-generic values. */

	dev->flags |= IFF_NOARP;
@@ -171,6 +354,7 @@ static int dummy_validate(struct nlattr *tb[], struct nlattr *data[]) 


static struct rtnl_link_ops dummy_link_ops __read_mostly = {

	.kind		= DRV_NAME,

	.priv_size	= sizeof(struct dummy_priv),

	.setup		= dummy_setup,

	.validate	= dummy_validate,

};
@@ -179,12 +363,16 @@ static struct rtnl_link_ops dummy_link_ops __read_mostly = { 
module_param(numdummies, int, 0);

MODULE_PARM_DESC(numdummies, "Number of dummy pseudo devices");



module_param(num_vfs, int, 0);

MODULE_PARM_DESC(num_vfs, "Number of dummy VFs per dummy device");



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);

	dev_dummy = alloc_netdev(sizeof(struct dummy_priv),

				 "dummy%d", NET_NAME_UNKNOWN, dummy_setup);

	if (!dev_dummy)

		return -ENOMEM;
@@ -203,6 +391,21 @@ static int __init dummy_init_module(void) 
{

	int i, err = 0;



	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;

		}

	}



	rtnl_lock();

	err = __rtnl_link_register(&dummy_link_ops);

	if (err < 0)
@@ -218,12 +421,22 @@ static int __init dummy_init_module(void) 
out:

	rtnl_unlock();



	if (err && num_vfs) {

		device_unregister(&dummy_parent);

		bus_unregister(&dummy_bus);

	}



	return err;

}



static void __exit dummy_cleanup_module(void)

{

	rtnl_link_unregister(&dummy_link_ops);



	if (num_vfs) {

		device_unregister(&dummy_parent);

		bus_unregister(&dummy_bus);

	}

}



module_init(dummy_init_module);

CRA Git | Maintained and supported by SUSTech CRA and CCSE