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, 522 insertions, 0 deletions

diff --git a/drivers/net/usb/net1080.c b/drivers/net/usb/net1080.c
new file mode 100644
index 000000000..b0c0c9dd6
--- /dev/null
+++ b/drivers/net/usb/net1080.c
@@ -0,0 +1,522 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Net1080 based USB host-to-host cables
+ * Copyright (C) 2000-2005 by David Brownell
+ */
+
+// #define	DEBUG			// error path messages, extra info
+// #define	VERBOSE			// more; success messages
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/workqueue.h>
+#include <linux/mii.h>
+#include <linux/usb.h>
+#include <linux/usb/usbnet.h>
+#include <linux/slab.h>
+
+#include <asm/unaligned.h>
+
+
+/*
+ * Netchip 1080 driver ... http://www.netchip.com
+ * (Sept 2004:  End-of-life announcement has been sent.)
+ * Used in (some) LapLink cables
+ */
+
+#define frame_errors	data[1]
+
+/*
+ * NetChip framing of ethernet packets, supporting additional error
+ * checks for links that may drop bulk packets from inside messages.
+ * Odd USB length == always short read for last usb packet.
+ *	- nc_header
+ *	- Ethernet header (14 bytes)
+ *	- payload
+ *	- (optional padding byte, if needed so length becomes odd)
+ *	- nc_trailer
+ *
+ * This framing is to be avoided for non-NetChip devices.
+ */
+
+struct nc_header {		// packed:
+	__le16	hdr_len;		// sizeof nc_header (LE, all)
+	__le16	packet_len;		// payload size (including ethhdr)
+	__le16	packet_id;		// detects dropped packets
+#define MIN_HEADER	6
+
+	// all else is optional, and must start with:
+	// __le16	vendorId;	// from usb-if
+	// __le16	productId;
+} __packed;
+
+#define	PAD_BYTE	((unsigned char)0xAC)
+
+struct nc_trailer {
+	__le16	packet_id;
+} __packed;
+
+// packets may use FLAG_FRAMING_NC and optional pad
+#define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \
+				+ sizeof (struct ethhdr) \
+				+ (mtu) \
+				+ 1 \
+				+ sizeof (struct nc_trailer))
+
+#define MIN_FRAMED	FRAMED_SIZE(0)
+
+/* packets _could_ be up to 64KB... */
+#define NC_MAX_PACKET	32767
+
+
+/*
+ * Zero means no timeout; else, how long a 64 byte bulk packet may be queued
+ * before the hardware drops it.  If that's done, the driver will need to
+ * frame network packets to guard against the dropped USB packets.  The win32
+ * driver sets this for both sides of the link.
+ */
+#define	NC_READ_TTL_MS	((u8)255)	// ms
+
+/*
+ * We ignore most registers and EEPROM contents.
+ */
+#define	REG_USBCTL	((u8)0x04)
+#define REG_TTL		((u8)0x10)
+#define REG_STATUS	((u8)0x11)
+
+/*
+ * Vendor specific requests to read/write data
+ */
+#define	REQUEST_REGISTER	((u8)0x10)
+#define	REQUEST_EEPROM		((u8)0x11)
+
+static int
+nc_vendor_read(struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr)
+{
+	int status = usbnet_read_cmd(dev, req,
+				     USB_DIR_IN | USB_TYPE_VENDOR |
+				     USB_RECIP_DEVICE,
+				     0, regnum, retval_ptr,
+				     sizeof *retval_ptr);
+	if (status > 0)
+		status = 0;
+	if (!status)
+		le16_to_cpus(retval_ptr);
+	return status;
+}
+
+static inline int
+nc_register_read(struct usbnet *dev, u8 regnum, u16 *retval_ptr)
+{
+	return nc_vendor_read(dev, REQUEST_REGISTER, regnum, retval_ptr);
+}
+
+static void
+nc_vendor_write(struct usbnet *dev, u8 req, u8 regnum, u16 value)
+{
+	usbnet_write_cmd(dev, req,
+			 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+			 value, regnum, NULL, 0);
+}
+
+static inline void
+nc_register_write(struct usbnet *dev, u8 regnum, u16 value)
+{
+	nc_vendor_write(dev, REQUEST_REGISTER, regnum, value);
+}
+
+
+#if 0
+static void nc_dump_registers(struct usbnet *dev)
+{
+	u8	reg;
+	u16	*vp = kmalloc(sizeof (u16));
+
+	if (!vp)
+		return;
+
+	netdev_dbg(dev->net, "registers:\n");
+	for (reg = 0; reg < 0x20; reg++) {
+		int retval;
+
+		// reading some registers is trouble
+		if (reg >= 0x08 && reg <= 0xf)
+			continue;
+		if (reg >= 0x12 && reg <= 0x1e)
+			continue;
+
+		retval = nc_register_read(dev, reg, vp);
+		if (retval < 0)
+			netdev_dbg(dev->net, "reg [0x%x] ==> error %d\n",
+				   reg, retval);
+		else
+			netdev_dbg(dev->net, "reg [0x%x] = 0x%x\n", reg, *vp);
+	}
+	kfree(vp);
+}
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Control register
+ */
+
+#define	USBCTL_WRITABLE_MASK	0x1f0f
+// bits 15-13 reserved, r/o
+#define	USBCTL_ENABLE_LANG	(1 << 12)
+#define	USBCTL_ENABLE_MFGR	(1 << 11)
+#define	USBCTL_ENABLE_PROD	(1 << 10)
+#define	USBCTL_ENABLE_SERIAL	(1 << 9)
+#define	USBCTL_ENABLE_DEFAULTS	(1 << 8)
+// bits 7-4 reserved, r/o
+#define	USBCTL_FLUSH_OTHER	(1 << 3)
+#define	USBCTL_FLUSH_THIS	(1 << 2)
+#define	USBCTL_DISCONN_OTHER	(1 << 1)
+#define	USBCTL_DISCONN_THIS	(1 << 0)
+
+static inline void nc_dump_usbctl(struct usbnet *dev, u16 usbctl)
+{
+	netif_dbg(dev, link, dev->net,
+		  "net1080 %s-%s usbctl 0x%x:%s%s%s%s%s; this%s%s; other%s%s; r/o 0x%x\n",
+		  dev->udev->bus->bus_name, dev->udev->devpath,
+		  usbctl,
+		  (usbctl & USBCTL_ENABLE_LANG) ? " lang" : "",
+		  (usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "",
+		  (usbctl & USBCTL_ENABLE_PROD) ? " prod" : "",
+		  (usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "",
+		  (usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "",
+
+		  (usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "",
+		  (usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "",
+
+		  (usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "",
+		  (usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "",
+
+		  usbctl & ~USBCTL_WRITABLE_MASK);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Status register
+ */
+
+#define	STATUS_PORT_A		(1 << 15)
+
+#define	STATUS_CONN_OTHER	(1 << 14)
+#define	STATUS_SUSPEND_OTHER	(1 << 13)
+#define	STATUS_MAILBOX_OTHER	(1 << 12)
+#define	STATUS_PACKETS_OTHER(n)	(((n) >> 8) & 0x03)
+
+#define	STATUS_CONN_THIS	(1 << 6)
+#define	STATUS_SUSPEND_THIS	(1 << 5)
+#define	STATUS_MAILBOX_THIS	(1 << 4)
+#define	STATUS_PACKETS_THIS(n)	(((n) >> 0) & 0x03)
+
+#define	STATUS_UNSPEC_MASK	0x0c8c
+#define	STATUS_NOISE_MASK 	((u16)~(0x0303|STATUS_UNSPEC_MASK))
+
+
+static inline void nc_dump_status(struct usbnet *dev, u16 status)
+{
+	netif_dbg(dev, link, dev->net,
+		  "net1080 %s-%s status 0x%x: this (%c) PKT=%d%s%s%s; other PKT=%d%s%s%s; unspec 0x%x\n",
+		  dev->udev->bus->bus_name, dev->udev->devpath,
+		  status,
+
+		  // XXX the packet counts don't seem right
+		  // (1 at reset, not 0); maybe UNSPEC too
+
+		  (status & STATUS_PORT_A) ? 'A' : 'B',
+		  STATUS_PACKETS_THIS(status),
+		  (status & STATUS_CONN_THIS) ? " CON" : "",
+		  (status & STATUS_SUSPEND_THIS) ? " SUS" : "",
+		  (status & STATUS_MAILBOX_THIS) ? " MBOX" : "",
+
+		  STATUS_PACKETS_OTHER(status),
+		  (status & STATUS_CONN_OTHER) ? " CON" : "",
+		  (status & STATUS_SUSPEND_OTHER) ? " SUS" : "",
+		  (status & STATUS_MAILBOX_OTHER) ? " MBOX" : "",
+
+		  status & STATUS_UNSPEC_MASK);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * TTL register
+ */
+
+#define	TTL_OTHER(ttl)	(0x00ff & (ttl >> 8))
+#define MK_TTL(this,other)	((u16)(((other)<<8)|(0x00ff&(this))))
+
+/*-------------------------------------------------------------------------*/
+
+static int net1080_reset(struct usbnet *dev)
+{
+	u16		usbctl, status, ttl;
+	u16		vp;
+	int		retval;
+
+	// nc_dump_registers(dev);
+
+	if ((retval = nc_register_read(dev, REG_STATUS, &vp)) < 0) {
+		netdev_dbg(dev->net, "can't read %s-%s status: %d\n",
+			   dev->udev->bus->bus_name, dev->udev->devpath, retval);
+		goto done;
+	}
+	status = vp;
+	nc_dump_status(dev, status);
+
+	if ((retval = nc_register_read(dev, REG_USBCTL, &vp)) < 0) {
+		netdev_dbg(dev->net, "can't read USBCTL, %d\n", retval);
+		goto done;
+	}
+	usbctl = vp;
+	nc_dump_usbctl(dev, usbctl);
+
+	nc_register_write(dev, REG_USBCTL,
+			USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER);
+
+	if ((retval = nc_register_read(dev, REG_TTL, &vp)) < 0) {
+		netdev_dbg(dev->net, "can't read TTL, %d\n", retval);
+		goto done;
+	}
+	ttl = vp;
+
+	nc_register_write(dev, REG_TTL,
+			MK_TTL(NC_READ_TTL_MS, TTL_OTHER(ttl)) );
+	netdev_dbg(dev->net, "assigned TTL, %d ms\n", NC_READ_TTL_MS);
+
+	netif_info(dev, link, dev->net, "port %c, peer %sconnected\n",
+		   (status & STATUS_PORT_A) ? 'A' : 'B',
+		   (status & STATUS_CONN_OTHER) ? "" : "dis");
+	retval = 0;
+
+done:
+	return retval;
+}
+
+static int net1080_check_connect(struct usbnet *dev)
+{
+	int			retval;
+	u16			status;
+	u16			vp;
+
+	retval = nc_register_read(dev, REG_STATUS, &vp);
+	status = vp;
+	if (retval != 0) {
+		netdev_dbg(dev->net, "net1080_check_conn read - %d\n", retval);
+		return retval;
+	}
+	if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER)
+		return -ENOLINK;
+	return 0;
+}
+
+static void nc_ensure_sync(struct usbnet *dev)
+{
+	if (++dev->frame_errors <= 5)
+		return;
+
+	if (usbnet_write_cmd_async(dev, REQUEST_REGISTER,
+					USB_DIR_OUT | USB_TYPE_VENDOR |
+					USB_RECIP_DEVICE,
+					USBCTL_FLUSH_THIS |
+					USBCTL_FLUSH_OTHER,
+					REG_USBCTL, NULL, 0))
+		return;
+
+	netif_dbg(dev, rx_err, dev->net,
+		  "flush net1080; too many framing errors\n");
+	dev->frame_errors = 0;
+}
+
+static int net1080_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
+{
+	struct nc_header	*header;
+	struct nc_trailer	*trailer;
+	u16			hdr_len, packet_len;
+
+	/* This check is no longer done by usbnet */
+	if (skb->len < dev->net->hard_header_len)
+		return 0;
+
+	if (!(skb->len & 0x01)) {
+		netdev_dbg(dev->net, "rx framesize %d range %d..%d mtu %d\n",
+			   skb->len, dev->net->hard_header_len, dev->hard_mtu,
+			   dev->net->mtu);
+		dev->net->stats.rx_frame_errors++;
+		nc_ensure_sync(dev);
+		return 0;
+	}
+
+	header = (struct nc_header *) skb->data;
+	hdr_len = le16_to_cpup(&header->hdr_len);
+	packet_len = le16_to_cpup(&header->packet_len);
+	if (FRAMED_SIZE(packet_len) > NC_MAX_PACKET) {
+		dev->net->stats.rx_frame_errors++;
+		netdev_dbg(dev->net, "packet too big, %d\n", packet_len);
+		nc_ensure_sync(dev);
+		return 0;
+	} else if (hdr_len < MIN_HEADER) {
+		dev->net->stats.rx_frame_errors++;
+		netdev_dbg(dev->net, "header too short, %d\n", hdr_len);
+		nc_ensure_sync(dev);
+		return 0;
+	} else if (hdr_len > MIN_HEADER) {
+		// out of band data for us?
+		netdev_dbg(dev->net, "header OOB, %d bytes\n", hdr_len - MIN_HEADER);
+		nc_ensure_sync(dev);
+		// switch (vendor/product ids) { ... }
+	}
+	skb_pull(skb, hdr_len);
+
+	trailer = (struct nc_trailer *)
+		(skb->data + skb->len - sizeof *trailer);
+	skb_trim(skb, skb->len - sizeof *trailer);
+
+	if ((packet_len & 0x01) == 0) {
+		if (skb->data [packet_len] != PAD_BYTE) {
+			dev->net->stats.rx_frame_errors++;
+			netdev_dbg(dev->net, "bad pad\n");
+			return 0;
+		}
+		skb_trim(skb, skb->len - 1);
+	}
+	if (skb->len != packet_len) {
+		dev->net->stats.rx_frame_errors++;
+		netdev_dbg(dev->net, "bad packet len %d (expected %d)\n",
+			   skb->len, packet_len);
+		nc_ensure_sync(dev);
+		return 0;
+	}
+	if (header->packet_id != get_unaligned(&trailer->packet_id)) {
+		dev->net->stats.rx_fifo_errors++;
+		netdev_dbg(dev->net, "(2+ dropped) rx packet_id mismatch 0x%x 0x%x\n",
+			   le16_to_cpu(header->packet_id),
+			   le16_to_cpu(trailer->packet_id));
+		return 0;
+	}
+#if 0
+	netdev_dbg(dev->net, "frame <rx h %d p %d id %d\n", header->hdr_len,
+		   header->packet_len, header->packet_id);
+#endif
+	dev->frame_errors = 0;
+	return 1;
+}
+
+static struct sk_buff *
+net1080_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
+{
+	struct sk_buff		*skb2;
+	struct nc_header	*header = NULL;
+	struct nc_trailer	*trailer = NULL;
+	int			padlen = sizeof (struct nc_trailer);
+	int			len = skb->len;
+
+	if (!((len + padlen + sizeof (struct nc_header)) & 0x01))
+		padlen++;
+	if (!skb_cloned(skb)) {
+		int	headroom = skb_headroom(skb);
+		int	tailroom = skb_tailroom(skb);
+
+		if (padlen <= tailroom &&
+		    sizeof(struct nc_header) <= headroom)
+			/* There's enough head and tail room */
+			goto encapsulate;
+
+		if ((sizeof (struct nc_header) + padlen) <
+				(headroom + tailroom)) {
+			/* There's enough total room, so just readjust */
+			skb->data = memmove(skb->head
+						+ sizeof (struct nc_header),
+					    skb->data, skb->len);
+			skb_set_tail_pointer(skb, len);
+			goto encapsulate;
+		}
+	}
+
+	/* Create a new skb to use with the correct size */
+	skb2 = skb_copy_expand(skb,
+				sizeof (struct nc_header),
+				padlen,
+				flags);
+	dev_kfree_skb_any(skb);
+	if (!skb2)
+		return skb2;
+	skb = skb2;
+
+encapsulate:
+	/* header first */
+	header = skb_push(skb, sizeof *header);
+	header->hdr_len = cpu_to_le16(sizeof (*header));
+	header->packet_len = cpu_to_le16(len);
+	header->packet_id = cpu_to_le16((u16)dev->xid++);
+
+	/* maybe pad; then trailer */
+	if (!((skb->len + sizeof *trailer) & 0x01))
+		skb_put_u8(skb, PAD_BYTE);
+	trailer = skb_put(skb, sizeof *trailer);
+	put_unaligned(header->packet_id, &trailer->packet_id);
+#if 0
+	netdev_dbg(dev->net, "frame >tx h %d p %d id %d\n",
+		   header->hdr_len, header->packet_len,
+		   header->packet_id);
+#endif
+	return skb;
+}
+
+static int net1080_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+	unsigned	extra = sizeof (struct nc_header)
+				+ 1
+				+ sizeof (struct nc_trailer);
+
+	dev->net->hard_header_len += extra;
+	dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu;
+	dev->hard_mtu = NC_MAX_PACKET;
+	return usbnet_get_endpoints (dev, intf);
+}
+
+static const struct driver_info	net1080_info = {
+	.description =	"NetChip TurboCONNECT",
+	.flags =	FLAG_POINTTOPOINT | FLAG_FRAMING_NC,
+	.bind =		net1080_bind,
+	.reset =	net1080_reset,
+	.check_connect = net1080_check_connect,
+	.rx_fixup =	net1080_rx_fixup,
+	.tx_fixup =	net1080_tx_fixup,
+};
+
+static const struct usb_device_id	products [] = {
+{
+	USB_DEVICE(0x0525, 0x1080),	// NetChip ref design
+	.driver_info =	(unsigned long) &net1080_info,
+}, {
+	USB_DEVICE(0x06D0, 0x0622),	// Laplink Gold
+	.driver_info =	(unsigned long) &net1080_info,
+},
+	{ },		// END
+};
+MODULE_DEVICE_TABLE(usb, products);
+
+static struct usb_driver net1080_driver = {
+	.name =		"net1080",
+	.id_table =	products,
+	.probe =	usbnet_probe,
+	.disconnect =	usbnet_disconnect,
+	.suspend =	usbnet_suspend,
+	.resume =	usbnet_resume,
+	.disable_hub_initiated_lpm = 1,
+};
+
+module_usb_driver(net1080_driver);
+
+MODULE_AUTHOR("David Brownell");
+MODULE_DESCRIPTION("NetChip 1080 based USB Host-to-Host Links");
+MODULE_LICENSE("GPL");