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netdevsim: allow two netdevsim ports to be connected

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Add two netdevsim bus attribute to sysfs:
/sys/bus/netdevsim/link_device
/sys/bus/netdevsim/unlink_device

Writing "A M B N" to link_device will link netdevsim M in netnsid A with
netdevsim N in netnsid B.

Writing "A M" to unlink_device will unlink netdevsim M in netnsid A from
its peer, if any.

rtnl_lock is taken to ensure nothing changes during the linking.

Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Maciek Machnikowski <maciek@machnikowski.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Wei
2024-02-28 15:22:49 -08:00
committed by David S. Miller
parent e2d890afba
commit f532957d76
3 changed files with 157 additions and 0 deletions
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10
drivers/net/netdevsim/netdev.c
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@@ -413,8 +413,13 @@ err_free_netdev:
void nsim_destroy(struct netdevsim *ns)
{
struct net_device *dev = ns->netdev;
struct netdevsim *peer;
rtnl_lock();
peer = rtnl_dereference(ns->peer);
if (peer)
RCU_INIT_POINTER(peer->peer, NULL);
RCU_INIT_POINTER(ns->peer, NULL);
unregister_netdevice(dev);
if (nsim_dev_port_is_pf(ns->nsim_dev_port)) {
nsim_macsec_teardown(ns);
@@ -427,6 +432,11 @@ void nsim_destroy(struct netdevsim *ns)
free_netdev(dev);
}
bool netdev_is_nsim(struct net_device *dev)
{
return dev->netdev_ops == &nsim_netdev_ops;
}
static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{