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path: root/drivers/net/netdevsim/bus.c
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Diffstat (limited to 'drivers/net/netdevsim/bus.c')
-rw-r--r--drivers/net/netdevsim/bus.c149
1 files changed, 147 insertions, 2 deletions
diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c
index bcbc1e19ed..64c0cdd31b 100644
--- a/drivers/net/netdevsim/bus.c
+++ b/drivers/net/netdevsim/bus.c
@@ -129,7 +129,7 @@ static void nsim_bus_dev_release(struct device *dev)
complete(&nsim_bus_devs_released);
}
-static struct device_type nsim_bus_dev_type = {
+static const struct device_type nsim_bus_dev_type = {
.groups = nsim_bus_dev_attr_groups,
.release = nsim_bus_dev_release,
};
@@ -232,9 +232,154 @@ del_device_store(const struct bus_type *bus, const char *buf, size_t count)
}
static BUS_ATTR_WO(del_device);
+static ssize_t link_device_store(const struct bus_type *bus, const char *buf, size_t count)
+{
+ struct netdevsim *nsim_a, *nsim_b, *peer;
+ struct net_device *dev_a, *dev_b;
+ unsigned int ifidx_a, ifidx_b;
+ int netnsfd_a, netnsfd_b, err;
+ struct net *ns_a, *ns_b;
+
+ err = sscanf(buf, "%d:%u %d:%u", &netnsfd_a, &ifidx_a, &netnsfd_b,
+ &ifidx_b);
+ if (err != 4) {
+ pr_err("Format for linking two devices is \"netnsfd_a:ifidx_a netnsfd_b:ifidx_b\" (int uint int uint).\n");
+ return -EINVAL;
+ }
+
+ ns_a = get_net_ns_by_fd(netnsfd_a);
+ if (IS_ERR(ns_a)) {
+ pr_err("Could not find netns with fd: %d\n", netnsfd_a);
+ return -EINVAL;
+ }
+
+ ns_b = get_net_ns_by_fd(netnsfd_b);
+ if (IS_ERR(ns_b)) {
+ pr_err("Could not find netns with fd: %d\n", netnsfd_b);
+ put_net(ns_a);
+ return -EINVAL;
+ }
+
+ err = -EINVAL;
+ rtnl_lock();
+ dev_a = __dev_get_by_index(ns_a, ifidx_a);
+ if (!dev_a) {
+ pr_err("Could not find device with ifindex %u in netnsfd %d\n",
+ ifidx_a, netnsfd_a);
+ goto out_err;
+ }
+
+ if (!netdev_is_nsim(dev_a)) {
+ pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
+ ifidx_a, netnsfd_a);
+ goto out_err;
+ }
+
+ dev_b = __dev_get_by_index(ns_b, ifidx_b);
+ if (!dev_b) {
+ pr_err("Could not find device with ifindex %u in netnsfd %d\n",
+ ifidx_b, netnsfd_b);
+ goto out_err;
+ }
+
+ if (!netdev_is_nsim(dev_b)) {
+ pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
+ ifidx_b, netnsfd_b);
+ goto out_err;
+ }
+
+ if (dev_a == dev_b) {
+ pr_err("Cannot link a netdevsim to itself\n");
+ goto out_err;
+ }
+
+ err = -EBUSY;
+ nsim_a = netdev_priv(dev_a);
+ peer = rtnl_dereference(nsim_a->peer);
+ if (peer) {
+ pr_err("Netdevsim %d:%u is already linked\n", netnsfd_a,
+ ifidx_a);
+ goto out_err;
+ }
+
+ nsim_b = netdev_priv(dev_b);
+ peer = rtnl_dereference(nsim_b->peer);
+ if (peer) {
+ pr_err("Netdevsim %d:%u is already linked\n", netnsfd_b,
+ ifidx_b);
+ goto out_err;
+ }
+
+ err = 0;
+ rcu_assign_pointer(nsim_a->peer, nsim_b);
+ rcu_assign_pointer(nsim_b->peer, nsim_a);
+
+out_err:
+ put_net(ns_b);
+ put_net(ns_a);
+ rtnl_unlock();
+
+ return !err ? count : err;
+}
+static BUS_ATTR_WO(link_device);
+
+static ssize_t unlink_device_store(const struct bus_type *bus, const char *buf, size_t count)
+{
+ struct netdevsim *nsim, *peer;
+ struct net_device *dev;
+ unsigned int ifidx;
+ int netnsfd, err;
+ struct net *ns;
+
+ err = sscanf(buf, "%u:%u", &netnsfd, &ifidx);
+ if (err != 2) {
+ pr_err("Format for unlinking a device is \"netnsfd:ifidx\" (int uint).\n");
+ return -EINVAL;
+ }
+
+ ns = get_net_ns_by_fd(netnsfd);
+ if (IS_ERR(ns)) {
+ pr_err("Could not find netns with fd: %d\n", netnsfd);
+ return -EINVAL;
+ }
+
+ err = -EINVAL;
+ rtnl_lock();
+ dev = __dev_get_by_index(ns, ifidx);
+ if (!dev) {
+ pr_err("Could not find device with ifindex %u in netnsfd %d\n",
+ ifidx, netnsfd);
+ goto out_put_netns;
+ }
+
+ if (!netdev_is_nsim(dev)) {
+ pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
+ ifidx, netnsfd);
+ goto out_put_netns;
+ }
+
+ nsim = netdev_priv(dev);
+ peer = rtnl_dereference(nsim->peer);
+ if (!peer)
+ goto out_put_netns;
+
+ err = 0;
+ RCU_INIT_POINTER(nsim->peer, NULL);
+ RCU_INIT_POINTER(peer->peer, NULL);
+
+out_put_netns:
+ put_net(ns);
+ rtnl_unlock();
+
+ return !err ? count : err;
+}
+static BUS_ATTR_WO(unlink_device);
+
static struct attribute *nsim_bus_attrs[] = {
&bus_attr_new_device.attr,
&bus_attr_del_device.attr,
+ &bus_attr_link_device.attr,
+ &bus_attr_unlink_device.attr,
NULL
};
ATTRIBUTE_GROUPS(nsim_bus);
@@ -260,7 +405,7 @@ static int nsim_num_vf(struct device *dev)
return nsim_bus_dev->num_vfs;
}
-static struct bus_type nsim_bus = {
+static const struct bus_type nsim_bus = {
.name = DRV_NAME,
.dev_name = DRV_NAME,
.bus_groups = nsim_bus_groups,