diff options
Diffstat (limited to 'drivers/net/netdevsim/bus.c')
| -rw-r--r-- | drivers/net/netdevsim/bus.c | 149 |
1 files changed, 147 insertions, 2 deletions
diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c index bcbc1e19edde..64c0cdd31bf8 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, |