Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

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
  ...

1 files changed, 200 insertions, 0 deletions

diff --git a/drivers/net/dummy.c b/drivers/net/dummy.c
new file mode 100644
index 000000000..36a4e85c6
--- /dev/null
+++ b/drivers/net/dummy.c
@@ -0,0 +1,200 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* dummy.c: a dummy net driver
+
+	The purpose of this driver is to provide a device to point a
+	route through, but not to actually transmit packets.
+
+	Why?  If you have a machine whose only connection is an occasional
+	PPP/SLIP/PLIP link, you can only connect to your own hostname
+	when the link is up.  Otherwise you have to use localhost.
+	This isn't very consistent.
+
+	One solution is to set up a dummy link using PPP/SLIP/PLIP,
+	but this seems (to me) too much overhead for too little gain.
+	This driver provides a small alternative. Thus you can do
+
+	[when not running slip]
+		ifconfig dummy slip.addr.ess.here up
+	[to go to slip]
+		ifconfig dummy down
+		dip whatever
+
+	This was written by looking at Donald Becker's skeleton driver
+	and the loopback driver.  I then threw away anything that didn't
+	apply!	Thanks to Alan Cox for the key clue on what to do with
+	misguided packets.
+
+			Nick Holloway, 27th May 1994
+	[I tweaked this explanation a little but that's all]
+			Alan Cox, 30th May 1994
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/rtnetlink.h>
+#include <linux/net_tstamp.h>
+#include <net/netdev_lock.h>
+#include <net/rtnetlink.h>
+#include <linux/u64_stats_sync.h>
+
+#define DRV_NAME	"dummy"
+
+static int numdummies = 1;
+
+/* fake multicast ability */
+static int set_multicast_list(struct net_device *dev,
+			      struct netdev_hw_addr_list *uc,
+			      struct netdev_hw_addr_list *mc)
+{
+	return 0;
+}
+
+static void dummy_get_stats64(struct net_device *dev,
+			      struct rtnl_link_stats64 *stats)
+{
+	dev_lstats_read(dev, &stats->tx_packets, &stats->tx_bytes);
+}
+
+static netdev_tx_t dummy_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	dev_lstats_add(dev, skb->len);
+
+	skb_tx_timestamp(skb);
+	dev_kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+static int dummy_dev_init(struct net_device *dev)
+{
+	dev->pcpu_stat_type = NETDEV_PCPU_STAT_LSTATS;
+
+	netdev_lockdep_set_classes(dev);
+	return 0;
+}
+
+static int dummy_change_carrier(struct net_device *dev, bool new_carrier)
+{
+	if (new_carrier)
+		netif_carrier_on(dev);
+	else
+		netif_carrier_off(dev);
+	return 0;
+}
+
+static const struct net_device_ops dummy_netdev_ops = {
+	.ndo_init		= dummy_dev_init,
+	.ndo_start_xmit		= dummy_xmit,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_rx_mode_async	= set_multicast_list,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_get_stats64	= dummy_get_stats64,
+	.ndo_change_carrier	= dummy_change_carrier,
+};
+
+static const struct ethtool_ops dummy_ethtool_ops = {
+	.get_ts_info		= ethtool_op_get_ts_info,
+};
+
+static void dummy_setup(struct net_device *dev)
+{
+	ether_setup(dev);
+
+	/* Initialize the device structure. */
+	dev->netdev_ops = &dummy_netdev_ops;
+	dev->ethtool_ops = &dummy_ethtool_ops;
+	dev->needs_free_netdev = true;
+	dev->request_ops_lock = true;
+
+	/* Fill in device structure with ethernet-generic values. */
+	dev->flags |= IFF_NOARP;
+	dev->flags &= ~IFF_MULTICAST;
+	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
+	dev->lltx = true;
+	dev->features	|= NETIF_F_SG | NETIF_F_FRAGLIST;
+	dev->features	|= NETIF_F_GSO_SOFTWARE;
+	dev->features	|= NETIF_F_HW_CSUM | NETIF_F_HIGHDMA;
+	dev->features	|= NETIF_F_GSO_ENCAP_ALL;
+	dev->hw_features |= dev->features;
+	dev->hw_enc_features |= dev->features;
+	eth_hw_addr_random(dev);
+
+	dev->min_mtu = 0;
+	dev->max_mtu = 0;
+}
+
+static int dummy_validate(struct nlattr *tb[], struct nlattr *data[],
+			  struct netlink_ext_ack *extack)
+{
+	if (tb[IFLA_ADDRESS]) {
+		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+			return -EINVAL;
+		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+			return -EADDRNOTAVAIL;
+	}
+	return 0;
+}
+
+static struct rtnl_link_ops dummy_link_ops __read_mostly = {
+	.kind		= DRV_NAME,
+	.setup		= dummy_setup,
+	.validate	= dummy_validate,
+};
+
+/* Number of dummy devices to be set up by this module. */
+module_param(numdummies, int, 0);
+MODULE_PARM_DESC(numdummies, "Number of dummy pseudo devices");
+
+static int __init dummy_init_one(void)
+{
+	struct net_device *dev_dummy;
+	int err;
+
+	dev_dummy = alloc_netdev(0, "dummy%d", NET_NAME_ENUM, dummy_setup);
+	if (!dev_dummy)
+		return -ENOMEM;
+
+	dev_dummy->rtnl_link_ops = &dummy_link_ops;
+	err = register_netdev(dev_dummy);
+	if (err < 0)
+		goto err;
+	return 0;
+
+err:
+	free_netdev(dev_dummy);
+	return err;
+}
+
+static int __init dummy_init_module(void)
+{
+	int i, err = 0;
+
+	err = rtnl_link_register(&dummy_link_ops);
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < numdummies && !err; i++) {
+		err = dummy_init_one();
+		cond_resched();
+	}
+
+	if (err < 0)
+		rtnl_link_unregister(&dummy_link_ops);
+
+	return err;
+}
+
+static void __exit dummy_cleanup_module(void)
+{
+	rtnl_link_unregister(&dummy_link_ops);
+}
+
+module_init(dummy_init_module);
+module_exit(dummy_cleanup_module);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Dummy netdevice driver which discards all packets sent to it");
+MODULE_ALIAS_RTNL_LINK(DRV_NAME);