From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/net/macvtap.c | 256 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 256 insertions(+) create mode 100644 drivers/net/macvtap.c (limited to 'drivers/net/macvtap.c') diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c new file mode 100644 index 000000000..cc975dfb7 --- /dev/null +++ b/drivers/net/macvtap.c @@ -0,0 +1,256 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +struct macvtap_dev { + struct macvlan_dev vlan; + struct tap_dev tap; +}; + +/* + * Variables for dealing with macvtaps device numbers. + */ +static dev_t macvtap_major; + +static const struct ns_common *macvtap_net_namespace(const struct device *d) +{ + const struct net_device *dev = to_net_dev(d->parent); + + return to_ns_common(dev_net(dev)); +} + +static struct class macvtap_class = { + .name = "macvtap", + .ns_type = &net_ns_type_operations, + .namespace = macvtap_net_namespace, +}; +static struct cdev macvtap_cdev; + +#define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \ + NETIF_F_TSO6) + +static void macvtap_count_tx_dropped(struct tap_dev *tap) +{ + struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); + struct macvlan_dev *vlan = &vlantap->vlan; + + this_cpu_inc(vlan->pcpu_stats->tx_dropped); +} + +static void macvtap_count_rx_dropped(struct tap_dev *tap) +{ + struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); + struct macvlan_dev *vlan = &vlantap->vlan; + + macvlan_count_rx(vlan, 0, 0, 0); +} + +static void macvtap_update_features(struct tap_dev *tap, + netdev_features_t features) +{ + struct macvtap_dev *vlantap = container_of(tap, struct macvtap_dev, tap); + struct macvlan_dev *vlan = &vlantap->vlan; + + vlan->set_features = features; + netdev_update_features(vlan->dev); +} + +static int macvtap_newlink(struct net_device *dev, + struct rtnl_newlink_params *params, + struct netlink_ext_ack *extack) +{ + struct macvtap_dev *vlantap = netdev_priv(dev); + int err; + + INIT_LIST_HEAD(&vlantap->tap.queue_list); + + /* Since macvlan supports all offloads by default, make + * tap support all offloads also. + */ + vlantap->tap.tap_features = TUN_OFFLOADS; + + /* Register callbacks for rx/tx drops accounting and updating + * net_device features + */ + vlantap->tap.count_tx_dropped = macvtap_count_tx_dropped; + vlantap->tap.count_rx_dropped = macvtap_count_rx_dropped; + vlantap->tap.update_features = macvtap_update_features; + + err = netdev_rx_handler_register(dev, tap_handle_frame, &vlantap->tap); + if (err) + return err; + + /* Don't put anything that may fail after macvlan_common_newlink + * because we can't undo what it does. + */ + err = macvlan_common_newlink(dev, params, extack); + if (err) { + netdev_rx_handler_unregister(dev); + return err; + } + + vlantap->tap.dev = vlantap->vlan.dev; + + return 0; +} + +static void macvtap_dellink(struct net_device *dev, + struct list_head *head) +{ + struct macvtap_dev *vlantap = netdev_priv(dev); + + netdev_rx_handler_unregister(dev); + tap_del_queues(&vlantap->tap); + macvlan_dellink(dev, head); +} + +static void macvtap_setup(struct net_device *dev) +{ + macvlan_common_setup(dev); + dev->tx_queue_len = TUN_READQ_SIZE; +} + +static struct net *macvtap_link_net(const struct net_device *dev) +{ + return dev_net(macvlan_dev_real_dev(dev)); +} + +static struct rtnl_link_ops macvtap_link_ops __read_mostly = { + .kind = "macvtap", + .setup = macvtap_setup, + .newlink = macvtap_newlink, + .dellink = macvtap_dellink, + .get_link_net = macvtap_link_net, + .priv_size = sizeof(struct macvtap_dev), +}; + +static int macvtap_device_event(struct notifier_block *unused, + unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct macvtap_dev *vlantap; + struct device *classdev; + dev_t devt; + int err; + char tap_name[IFNAMSIZ]; + + if (dev->rtnl_link_ops != &macvtap_link_ops) + return NOTIFY_DONE; + + snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex); + vlantap = netdev_priv(dev); + + switch (event) { + case NETDEV_REGISTER: + /* Create the device node here after the network device has + * been registered but before register_netdevice has + * finished running. + */ + err = tap_get_minor(macvtap_major, &vlantap->tap); + if (err) + return notifier_from_errno(err); + + devt = MKDEV(MAJOR(macvtap_major), vlantap->tap.minor); + classdev = device_create(&macvtap_class, &dev->dev, devt, + dev, "%s", tap_name); + if (IS_ERR(classdev)) { + tap_free_minor(macvtap_major, &vlantap->tap); + return notifier_from_errno(PTR_ERR(classdev)); + } + err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj, + tap_name); + if (err) + return notifier_from_errno(err); + break; + case NETDEV_UNREGISTER: + /* vlan->minor == 0 if NETDEV_REGISTER above failed */ + if (vlantap->tap.minor == 0) + break; + sysfs_remove_link(&dev->dev.kobj, tap_name); + devt = MKDEV(MAJOR(macvtap_major), vlantap->tap.minor); + device_destroy(&macvtap_class, devt); + tap_free_minor(macvtap_major, &vlantap->tap); + break; + case NETDEV_CHANGE_TX_QUEUE_LEN: + if (tap_queue_resize(&vlantap->tap)) + return NOTIFY_BAD; + break; + } + + return NOTIFY_DONE; +} + +static struct notifier_block macvtap_notifier_block __read_mostly = { + .notifier_call = macvtap_device_event, +}; + +static int __init macvtap_init(void) +{ + int err; + + err = tap_create_cdev(&macvtap_cdev, &macvtap_major, "macvtap", + THIS_MODULE); + if (err) + goto out1; + + err = class_register(&macvtap_class); + if (err) + goto out2; + + err = register_netdevice_notifier(&macvtap_notifier_block); + if (err) + goto out3; + + err = macvlan_link_register(&macvtap_link_ops); + if (err) + goto out4; + + return 0; + +out4: + unregister_netdevice_notifier(&macvtap_notifier_block); +out3: + class_unregister(&macvtap_class); +out2: + tap_destroy_cdev(macvtap_major, &macvtap_cdev); +out1: + return err; +} +module_init(macvtap_init); + +static void __exit macvtap_exit(void) +{ + rtnl_link_unregister(&macvtap_link_ops); + unregister_netdevice_notifier(&macvtap_notifier_block); + class_unregister(&macvtap_class); + tap_destroy_cdev(macvtap_major, &macvtap_cdev); +} +module_exit(macvtap_exit); + +MODULE_ALIAS_RTNL_LINK("macvtap"); +MODULE_DESCRIPTION("MAC-VLAN based tap driver"); +MODULE_AUTHOR("Arnd Bergmann "); +MODULE_LICENSE("GPL"); -- cgit v1.3.1