Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 640 insertions, 0 deletions

diff --git a/drivers/usb/usbip/vudc_dev.c b/drivers/usb/usbip/vudc_dev.c
new file mode 100644
index 000000000..2bc428f2e
--- /dev/null
+++ b/drivers/usb/usbip/vudc_dev.c
@@ -0,0 +1,640 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
+ * Copyright (C) 2015-2016 Samsung Electronics
+ *               Igor Kotrasinski <i.kotrasinsk@samsung.com>
+ *               Krzysztof Opasiak <k.opasiak@samsung.com>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/hcd.h>
+#include <linux/kthread.h>
+#include <linux/file.h>
+#include <linux/byteorder/generic.h>
+
+#include "usbip_common.h"
+#include "vudc.h"
+
+#define VIRTUAL_ENDPOINTS (1 /* ep0 */ + 15 /* in eps */ + 15 /* out eps */)
+
+/* urb-related structures alloc / free */
+
+
+static void free_urb(struct urb *urb)
+{
+	if (!urb)
+		return;
+
+	kfree(urb->setup_packet);
+	urb->setup_packet = NULL;
+
+	kfree(urb->transfer_buffer);
+	urb->transfer_buffer = NULL;
+
+	usb_free_urb(urb);
+}
+
+struct urbp *alloc_urbp(void)
+{
+	struct urbp *urb_p;
+
+	urb_p = kzalloc(sizeof(*urb_p), GFP_KERNEL);
+	if (!urb_p)
+		return urb_p;
+
+	urb_p->urb = NULL;
+	urb_p->ep = NULL;
+	INIT_LIST_HEAD(&urb_p->urb_entry);
+	return urb_p;
+}
+
+static void free_urbp(struct urbp *urb_p)
+{
+	kfree(urb_p);
+}
+
+void free_urbp_and_urb(struct urbp *urb_p)
+{
+	if (!urb_p)
+		return;
+	free_urb(urb_p->urb);
+	free_urbp(urb_p);
+}
+
+
+/* utilities ; almost verbatim from dummy_hcd.c */
+
+/* called with spinlock held */
+static void nuke(struct vudc *udc, struct vep *ep)
+{
+	struct vrequest	*req;
+
+	while (!list_empty(&ep->req_queue)) {
+		req = list_first_entry(&ep->req_queue, struct vrequest,
+				       req_entry);
+		list_del_init(&req->req_entry);
+		req->req.status = -ESHUTDOWN;
+
+		spin_unlock(&udc->lock);
+		usb_gadget_giveback_request(&ep->ep, &req->req);
+		spin_lock(&udc->lock);
+	}
+}
+
+/* caller must hold lock */
+static void stop_activity(struct vudc *udc)
+{
+	int i;
+	struct urbp *urb_p, *tmp;
+
+	udc->address = 0;
+
+	for (i = 0; i < VIRTUAL_ENDPOINTS; i++)
+		nuke(udc, &udc->ep[i]);
+
+	list_for_each_entry_safe(urb_p, tmp, &udc->urb_queue, urb_entry) {
+		list_del(&urb_p->urb_entry);
+		free_urbp_and_urb(urb_p);
+	}
+}
+
+struct vep *vudc_find_endpoint(struct vudc *udc, u8 address)
+{
+	int i;
+
+	if ((address & ~USB_DIR_IN) == 0)
+		return &udc->ep[0];
+
+	for (i = 1; i < VIRTUAL_ENDPOINTS; i++) {
+		struct vep *ep = &udc->ep[i];
+
+		if (!ep->desc)
+			continue;
+		if (ep->desc->bEndpointAddress == address)
+			return ep;
+	}
+	return NULL;
+}
+
+/* gadget ops */
+
+static int vgadget_get_frame(struct usb_gadget *_gadget)
+{
+	struct timespec64 now;
+	struct vudc *udc = usb_gadget_to_vudc(_gadget);
+
+	ktime_get_ts64(&now);
+	return ((now.tv_sec - udc->start_time.tv_sec) * 1000 +
+		(now.tv_nsec - udc->start_time.tv_nsec) / NSEC_PER_MSEC)
+			& 0x7FF;
+}
+
+static int vgadget_set_selfpowered(struct usb_gadget *_gadget, int value)
+{
+	struct vudc *udc = usb_gadget_to_vudc(_gadget);
+
+	if (value)
+		udc->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
+	else
+		udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
+	return 0;
+}
+
+static int vgadget_pullup(struct usb_gadget *_gadget, int value)
+{
+	struct vudc *udc = usb_gadget_to_vudc(_gadget);
+	unsigned long flags;
+	int ret;
+
+
+	spin_lock_irqsave(&udc->lock, flags);
+	value = !!value;
+	if (value == udc->pullup)
+		goto unlock;
+
+	udc->pullup = value;
+	if (value) {
+		udc->gadget.speed = min_t(u8, USB_SPEED_HIGH,
+					   udc->driver->max_speed);
+		udc->ep[0].ep.maxpacket = 64;
+		/*
+		 * This is the first place where we can ask our
+		 * gadget driver for descriptors.
+		 */
+		ret = get_gadget_descs(udc);
+		if (ret) {
+			dev_err(&udc->gadget.dev, "Unable go get desc: %d", ret);
+			goto unlock;
+		}
+
+		spin_unlock_irqrestore(&udc->lock, flags);
+		usbip_start_eh(&udc->ud);
+	} else {
+		/* Invalidate descriptors */
+		udc->desc_cached = 0;
+
+		spin_unlock_irqrestore(&udc->lock, flags);
+		usbip_event_add(&udc->ud, VUDC_EVENT_REMOVED);
+		usbip_stop_eh(&udc->ud); /* Wait for eh completion */
+	}
+
+	return 0;
+
+unlock:
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return 0;
+}
+
+static int vgadget_udc_start(struct usb_gadget *g,
+		struct usb_gadget_driver *driver)
+{
+	struct vudc *udc = usb_gadget_to_vudc(g);
+	unsigned long flags;
+
+	spin_lock_irqsave(&udc->lock, flags);
+	udc->driver = driver;
+	udc->pullup = udc->connected = udc->desc_cached = 0;
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+static int vgadget_udc_stop(struct usb_gadget *g)
+{
+	struct vudc *udc = usb_gadget_to_vudc(g);
+	unsigned long flags;
+
+	spin_lock_irqsave(&udc->lock, flags);
+	udc->driver = NULL;
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return 0;
+}
+
+static const struct usb_gadget_ops vgadget_ops = {
+	.get_frame	= vgadget_get_frame,
+	.set_selfpowered = vgadget_set_selfpowered,
+	.pullup		= vgadget_pullup,
+	.udc_start	= vgadget_udc_start,
+	.udc_stop	= vgadget_udc_stop,
+};
+
+
+/* endpoint ops */
+
+static int vep_enable(struct usb_ep *_ep,
+		const struct usb_endpoint_descriptor *desc)
+{
+	struct vep	*ep;
+	struct vudc	*udc;
+	unsigned int	maxp;
+	unsigned long	flags;
+
+	ep = to_vep(_ep);
+	udc = ep_to_vudc(ep);
+
+	if (!_ep || !desc || ep->desc || _ep->caps.type_control
+			|| desc->bDescriptorType != USB_DT_ENDPOINT)
+		return -EINVAL;
+
+	if (!udc->driver)
+		return -ESHUTDOWN;
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	maxp = usb_endpoint_maxp(desc);
+	_ep->maxpacket = maxp;
+	ep->desc = desc;
+	ep->type = usb_endpoint_type(desc);
+	ep->halted = ep->wedged = 0;
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+static int vep_disable(struct usb_ep *_ep)
+{
+	struct vep *ep;
+	struct vudc *udc;
+	unsigned long flags;
+
+	ep = to_vep(_ep);
+	udc = ep_to_vudc(ep);
+	if (!_ep || !ep->desc || _ep->caps.type_control)
+		return -EINVAL;
+
+	spin_lock_irqsave(&udc->lock, flags);
+	ep->desc = NULL;
+	nuke(udc, ep);
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+static struct usb_request *vep_alloc_request(struct usb_ep *_ep,
+		gfp_t mem_flags)
+{
+	struct vrequest *req;
+
+	if (!_ep)
+		return NULL;
+
+	req = kzalloc(sizeof(*req), mem_flags);
+	if (!req)
+		return NULL;
+
+	INIT_LIST_HEAD(&req->req_entry);
+
+	return &req->req;
+}
+
+static void vep_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct vrequest *req;
+
+	/* ep is always valid here - see usb_ep_free_request() */
+	if (!_req)
+		return;
+
+	req = to_vrequest(_req);
+	kfree(req);
+}
+
+static int vep_queue(struct usb_ep *_ep, struct usb_request *_req,
+		gfp_t mem_flags)
+{
+	struct vep *ep;
+	struct vrequest *req;
+	struct vudc *udc;
+	unsigned long flags;
+
+	if (!_ep || !_req)
+		return -EINVAL;
+
+	ep = to_vep(_ep);
+	req = to_vrequest(_req);
+	udc = ep_to_vudc(ep);
+
+	spin_lock_irqsave(&udc->lock, flags);
+	_req->actual = 0;
+	_req->status = -EINPROGRESS;
+
+	list_add_tail(&req->req_entry, &ep->req_queue);
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+static int vep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct vep *ep;
+	struct vrequest *req;
+	struct vudc *udc;
+	struct vrequest *lst;
+	unsigned long flags;
+	int ret = -EINVAL;
+
+	if (!_ep || !_req)
+		return ret;
+
+	ep = to_vep(_ep);
+	req = to_vrequest(_req);
+	udc = req->udc;
+
+	if (!udc->driver)
+		return -ESHUTDOWN;
+
+	spin_lock_irqsave(&udc->lock, flags);
+	list_for_each_entry(lst, &ep->req_queue, req_entry) {
+		if (&lst->req == _req) {
+			list_del_init(&lst->req_entry);
+			_req->status = -ECONNRESET;
+			ret = 0;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	if (ret == 0)
+		usb_gadget_giveback_request(_ep, _req);
+
+	return ret;
+}
+
+static int
+vep_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
+{
+	struct vep *ep;
+	struct vudc *udc;
+	unsigned long flags;
+	int ret = 0;
+
+	ep = to_vep(_ep);
+	if (!_ep)
+		return -EINVAL;
+
+	udc = ep_to_vudc(ep);
+	if (!udc->driver)
+		return -ESHUTDOWN;
+
+	spin_lock_irqsave(&udc->lock, flags);
+	if (!value)
+		ep->halted = ep->wedged = 0;
+	else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
+			!list_empty(&ep->req_queue))
+		ret = -EAGAIN;
+	else {
+		ep->halted = 1;
+		if (wedged)
+			ep->wedged = 1;
+	}
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return ret;
+}
+
+static int
+vep_set_halt(struct usb_ep *_ep, int value)
+{
+	return vep_set_halt_and_wedge(_ep, value, 0);
+}
+
+static int vep_set_wedge(struct usb_ep *_ep)
+{
+	return vep_set_halt_and_wedge(_ep, 1, 1);
+}
+
+static const struct usb_ep_ops vep_ops = {
+	.enable		= vep_enable,
+	.disable	= vep_disable,
+
+	.alloc_request	= vep_alloc_request,
+	.free_request	= vep_free_request,
+
+	.queue		= vep_queue,
+	.dequeue	= vep_dequeue,
+
+	.set_halt	= vep_set_halt,
+	.set_wedge	= vep_set_wedge,
+};
+
+
+/* shutdown / reset / error handlers */
+
+static void vudc_shutdown(struct usbip_device *ud)
+{
+	struct vudc *udc = container_of(ud, struct vudc, ud);
+	int call_disconnect = 0;
+	unsigned long flags;
+
+	dev_dbg(&udc->pdev->dev, "device shutdown");
+	if (ud->tcp_socket)
+		kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
+
+	if (ud->tcp_rx) {
+		kthread_stop_put(ud->tcp_rx);
+		ud->tcp_rx = NULL;
+	}
+	if (ud->tcp_tx) {
+		kthread_stop_put(ud->tcp_tx);
+		ud->tcp_tx = NULL;
+	}
+
+	if (ud->tcp_socket) {
+		sockfd_put(ud->tcp_socket);
+		ud->tcp_socket = NULL;
+	}
+
+	spin_lock_irqsave(&udc->lock, flags);
+	stop_activity(udc);
+	if (udc->connected && udc->driver->disconnect)
+		call_disconnect = 1;
+	udc->connected = 0;
+	spin_unlock_irqrestore(&udc->lock, flags);
+	if (call_disconnect)
+		udc->driver->disconnect(&udc->gadget);
+}
+
+static void vudc_device_reset(struct usbip_device *ud)
+{
+	struct vudc *udc = container_of(ud, struct vudc, ud);
+	unsigned long flags;
+
+	dev_dbg(&udc->pdev->dev, "device reset");
+	spin_lock_irqsave(&udc->lock, flags);
+	stop_activity(udc);
+	spin_unlock_irqrestore(&udc->lock, flags);
+	if (udc->driver)
+		usb_gadget_udc_reset(&udc->gadget, udc->driver);
+	spin_lock_irqsave(&ud->lock, flags);
+	ud->status = SDEV_ST_AVAILABLE;
+	spin_unlock_irqrestore(&ud->lock, flags);
+}
+
+static void vudc_device_unusable(struct usbip_device *ud)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&ud->lock, flags);
+	ud->status = SDEV_ST_ERROR;
+	spin_unlock_irqrestore(&ud->lock, flags);
+}
+
+/* device setup / cleanup */
+
+struct vudc_device *alloc_vudc_device(int devid)
+{
+	struct vudc_device *udc_dev = NULL;
+
+	udc_dev = kzalloc(sizeof(*udc_dev), GFP_KERNEL);
+	if (!udc_dev)
+		goto out;
+
+	INIT_LIST_HEAD(&udc_dev->dev_entry);
+
+	udc_dev->pdev = platform_device_alloc(GADGET_NAME, devid);
+	if (!udc_dev->pdev) {
+		kfree(udc_dev);
+		udc_dev = NULL;
+	}
+
+out:
+	return udc_dev;
+}
+
+void put_vudc_device(struct vudc_device *udc_dev)
+{
+	platform_device_put(udc_dev->pdev);
+	kfree(udc_dev);
+}
+
+static int init_vudc_hw(struct vudc *udc)
+{
+	int i;
+	struct usbip_device *ud = &udc->ud;
+	struct vep *ep;
+
+	udc->ep = kcalloc(VIRTUAL_ENDPOINTS, sizeof(*udc->ep), GFP_KERNEL);
+	if (!udc->ep)
+		goto nomem_ep;
+
+	INIT_LIST_HEAD(&udc->gadget.ep_list);
+
+	/* create ep0 and 15 in, 15 out general purpose eps */
+	for (i = 0; i < VIRTUAL_ENDPOINTS; ++i) {
+		int is_out = i % 2;
+		int num = (i + 1) / 2;
+
+		ep = &udc->ep[i];
+
+		sprintf(ep->name, "ep%d%s", num,
+			i ? (is_out ? "out" : "in") : "");
+		ep->ep.name = ep->name;
+
+		ep->ep.ops = &vep_ops;
+
+		usb_ep_set_maxpacket_limit(&ep->ep, ~0);
+		ep->ep.max_streams = 16;
+		ep->gadget = &udc->gadget;
+		INIT_LIST_HEAD(&ep->req_queue);
+
+		if (i == 0) {
+			/* ep0 */
+			ep->ep.caps.type_control = true;
+			ep->ep.caps.dir_out = true;
+			ep->ep.caps.dir_in = true;
+
+			udc->gadget.ep0 = &ep->ep;
+		} else {
+			/* All other eps */
+			ep->ep.caps.type_iso = true;
+			ep->ep.caps.type_int = true;
+			ep->ep.caps.type_bulk = true;
+
+			if (is_out)
+				ep->ep.caps.dir_out = true;
+			else
+				ep->ep.caps.dir_in = true;
+
+			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
+		}
+	}
+
+	spin_lock_init(&udc->lock);
+	spin_lock_init(&udc->lock_tx);
+	INIT_LIST_HEAD(&udc->urb_queue);
+	INIT_LIST_HEAD(&udc->tx_queue);
+	init_waitqueue_head(&udc->tx_waitq);
+
+	spin_lock_init(&ud->lock);
+	mutex_init(&ud->sysfs_lock);
+	ud->status = SDEV_ST_AVAILABLE;
+	ud->side = USBIP_VUDC;
+
+	ud->eh_ops.shutdown = vudc_shutdown;
+	ud->eh_ops.reset    = vudc_device_reset;
+	ud->eh_ops.unusable = vudc_device_unusable;
+
+	v_init_timer(udc);
+	return 0;
+
+nomem_ep:
+		return -ENOMEM;
+}
+
+static void cleanup_vudc_hw(struct vudc *udc)
+{
+	kfree(udc->ep);
+}
+
+/* platform driver ops */
+
+int vudc_probe(struct platform_device *pdev)
+{
+	struct vudc *udc;
+	int ret = -ENOMEM;
+
+	udc = kzalloc(sizeof(*udc), GFP_KERNEL);
+	if (!udc)
+		goto out;
+
+	udc->gadget.name = GADGET_NAME;
+	udc->gadget.ops = &vgadget_ops;
+	udc->gadget.max_speed = USB_SPEED_HIGH;
+	udc->gadget.dev.parent = &pdev->dev;
+	udc->pdev = pdev;
+
+	ret = init_vudc_hw(udc);
+	if (ret)
+		goto err_init_vudc_hw;
+
+	ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
+	if (ret < 0)
+		goto err_add_udc;
+
+	platform_set_drvdata(pdev, udc);
+
+	return ret;
+
+err_add_udc:
+	cleanup_vudc_hw(udc);
+err_init_vudc_hw:
+	kfree(udc);
+out:
+	return ret;
+}
+
+int vudc_remove(struct platform_device *pdev)
+{
+	struct vudc *udc = platform_get_drvdata(pdev);
+
+	usb_del_gadget_udc(&udc->gadget);
+	cleanup_vudc_hw(udc);
+	kfree(udc);
+	return 0;
+}