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, 420 insertions, 0 deletions

diff --git a/drivers/net/dsa/dsa_loop.c b/drivers/net/dsa/dsa_loop.c
new file mode 100644
index 000000000..5b139f220
--- /dev/null
+++ b/drivers/net/dsa/dsa_loop.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Distributed Switch Architecture loopback driver
+ *
+ * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/phy_fixed.h>
+#include <linux/export.h>
+#include <linux/ethtool.h>
+#include <linux/workqueue.h>
+#include <linux/module.h>
+#include <linux/if_bridge.h>
+#include <linux/dsa/loop.h>
+#include <net/dsa.h>
+
+#include "dsa_loop.h"
+
+static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
+	[DSA_LOOP_PHY_READ_OK]	= { "phy_read_ok", },
+	[DSA_LOOP_PHY_READ_ERR]	= { "phy_read_err", },
+	[DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
+	[DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
+};
+
+static struct phy_device *phydevs[PHY_MAX_ADDR];
+
+enum dsa_loop_devlink_resource_id {
+	DSA_LOOP_DEVLINK_PARAM_ID_VTU,
+};
+
+static u64 dsa_loop_devlink_vtu_get(void *priv)
+{
+	struct dsa_loop_priv *ps = priv;
+	unsigned int i, count = 0;
+	struct dsa_loop_vlan *vl;
+
+	for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
+		vl = &ps->vlans[i];
+		if (vl->members)
+			count++;
+	}
+
+	return count;
+}
+
+static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
+{
+	struct devlink_resource_size_params size_params;
+	struct dsa_loop_priv *ps = ds->priv;
+	int err;
+
+	devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
+					  ARRAY_SIZE(ps->vlans),
+					  1, DEVLINK_RESOURCE_UNIT_ENTRY);
+
+	err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
+					    DSA_LOOP_DEVLINK_PARAM_ID_VTU,
+					    DEVLINK_RESOURCE_ID_PARENT_TOP,
+					    &size_params);
+	if (err)
+		goto out;
+
+	dsa_devlink_resource_occ_get_register(ds,
+					      DSA_LOOP_DEVLINK_PARAM_ID_VTU,
+					      dsa_loop_devlink_vtu_get, ps);
+
+	return 0;
+
+out:
+	dsa_devlink_resources_unregister(ds);
+	return err;
+}
+
+static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
+						   int port,
+						   enum dsa_tag_protocol mp)
+{
+	dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
+
+	return DSA_TAG_PROTO_NONE;
+}
+
+static int dsa_loop_setup(struct dsa_switch *ds)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	unsigned int i;
+
+	for (i = 0; i < ds->num_ports; i++)
+		memcpy(ps->ports[i].mib, dsa_loop_mibs,
+		       sizeof(dsa_loop_mibs));
+
+	dev_dbg(ds->dev, "%s\n", __func__);
+
+	return dsa_loop_setup_devlink_resources(ds);
+}
+
+static void dsa_loop_teardown(struct dsa_switch *ds)
+{
+	dsa_devlink_resources_unregister(ds);
+}
+
+static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
+{
+	if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
+		return 0;
+
+	return __DSA_LOOP_CNT_MAX;
+}
+
+static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
+				 u32 stringset, uint8_t *data)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	unsigned int i;
+
+	if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
+		return;
+
+	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
+		memcpy(data + i * ETH_GSTRING_LEN,
+		       ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
+}
+
+static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
+				       uint64_t *data)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	unsigned int i;
+
+	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
+		data[i] = ps->ports[port].mib[i].val;
+}
+
+static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	struct mii_bus *bus = ps->bus;
+	int ret;
+
+	ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
+	if (ret < 0)
+		ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
+	else
+		ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
+
+	return ret;
+}
+
+static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
+			      int regnum, u16 value)
+{
+	struct dsa_loop_priv *ps = ds->priv;
+	struct mii_bus *bus = ps->bus;
+	int ret;
+
+	ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
+	if (ret < 0)
+		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
+	else
+		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
+
+	return ret;
+}
+
+static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
+				     struct dsa_bridge bridge,
+				     bool *tx_fwd_offload,
+				     struct netlink_ext_ack *extack)
+{
+	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
+		__func__, port, bridge.dev->name);
+
+	return 0;
+}
+
+static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
+				       struct dsa_bridge bridge)
+{
+	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
+		__func__, port, bridge.dev->name);
+}
+
+static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
+					u8 state)
+{
+	dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
+		__func__, port, state);
+}
+
+static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
+					bool vlan_filtering,
+					struct netlink_ext_ack *extack)
+{
+	dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
+		__func__, port, vlan_filtering);
+
+	return 0;
+}
+
+static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
+				  const struct switchdev_obj_port_vlan *vlan,
+				  struct netlink_ext_ack *extack)
+{
+	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
+	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
+	struct dsa_loop_priv *ps = ds->priv;
+	struct mii_bus *bus = ps->bus;
+	struct dsa_loop_vlan *vl;
+
+	if (vlan->vid >= ARRAY_SIZE(ps->vlans))
+		return -ERANGE;
+
+	/* Just do a sleeping operation to make lockdep checks effective */
+	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
+
+	vl = &ps->vlans[vlan->vid];
+
+	vl->members |= BIT(port);
+	if (untagged)
+		vl->untagged |= BIT(port);
+	else
+		vl->untagged &= ~BIT(port);
+
+	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
+		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
+
+	if (pvid)
+		ps->ports[port].pvid = vlan->vid;
+
+	return 0;
+}
+
+static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
+				  const struct switchdev_obj_port_vlan *vlan)
+{
+	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
+	struct dsa_loop_priv *ps = ds->priv;
+	u16 pvid = ps->ports[port].pvid;
+	struct mii_bus *bus = ps->bus;
+	struct dsa_loop_vlan *vl;
+
+	/* Just do a sleeping operation to make lockdep checks effective */
+	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
+
+	vl = &ps->vlans[vlan->vid];
+
+	vl->members &= ~BIT(port);
+	if (untagged)
+		vl->untagged &= ~BIT(port);
+
+	if (pvid == vlan->vid)
+		pvid = 1;
+
+	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
+		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
+	ps->ports[port].pvid = pvid;
+
+	return 0;
+}
+
+static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
+				    int new_mtu)
+{
+	struct dsa_loop_priv *priv = ds->priv;
+
+	priv->ports[port].mtu = new_mtu;
+
+	return 0;
+}
+
+static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
+{
+	return ETH_MAX_MTU;
+}
+
+static const struct dsa_switch_ops dsa_loop_driver = {
+	.get_tag_protocol	= dsa_loop_get_protocol,
+	.setup			= dsa_loop_setup,
+	.teardown		= dsa_loop_teardown,
+	.get_strings		= dsa_loop_get_strings,
+	.get_ethtool_stats	= dsa_loop_get_ethtool_stats,
+	.get_sset_count		= dsa_loop_get_sset_count,
+	.get_ethtool_phy_stats	= dsa_loop_get_ethtool_stats,
+	.phy_read		= dsa_loop_phy_read,
+	.phy_write		= dsa_loop_phy_write,
+	.port_bridge_join	= dsa_loop_port_bridge_join,
+	.port_bridge_leave	= dsa_loop_port_bridge_leave,
+	.port_stp_state_set	= dsa_loop_port_stp_state_set,
+	.port_vlan_filtering	= dsa_loop_port_vlan_filtering,
+	.port_vlan_add		= dsa_loop_port_vlan_add,
+	.port_vlan_del		= dsa_loop_port_vlan_del,
+	.port_change_mtu	= dsa_loop_port_change_mtu,
+	.port_max_mtu		= dsa_loop_port_max_mtu,
+};
+
+static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
+{
+	struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
+	struct dsa_loop_priv *ps;
+	struct dsa_switch *ds;
+	int ret;
+
+	if (!pdata)
+		return -ENODEV;
+
+	ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
+	if (!ds)
+		return -ENOMEM;
+
+	ds->dev = &mdiodev->dev;
+	ds->num_ports = DSA_LOOP_NUM_PORTS;
+
+	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
+	if (!ps)
+		return -ENOMEM;
+
+	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
+	if (!ps->netdev)
+		return -EPROBE_DEFER;
+
+	pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
+
+	ds->dev = &mdiodev->dev;
+	ds->ops = &dsa_loop_driver;
+	ds->priv = ps;
+	ps->bus = mdiodev->bus;
+
+	dev_set_drvdata(&mdiodev->dev, ds);
+
+	ret = dsa_register_switch(ds);
+	if (!ret)
+		dev_info(&mdiodev->dev, "%s: 0x%0x\n",
+			 pdata->name, pdata->enabled_ports);
+
+	return ret;
+}
+
+static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
+{
+	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
+	struct dsa_loop_priv *ps;
+
+	if (!ds)
+		return;
+
+	ps = ds->priv;
+
+	dsa_unregister_switch(ds);
+	dev_put(ps->netdev);
+}
+
+static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
+{
+	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
+
+	if (!ds)
+		return;
+
+	dsa_switch_shutdown(ds);
+
+	dev_set_drvdata(&mdiodev->dev, NULL);
+}
+
+static struct mdio_driver dsa_loop_drv = {
+	.mdiodrv.driver	= {
+		.name	= "dsa-loop",
+	},
+	.probe	= dsa_loop_drv_probe,
+	.remove	= dsa_loop_drv_remove,
+	.shutdown = dsa_loop_drv_shutdown,
+};
+
+#define NUM_FIXED_PHYS	(DSA_LOOP_NUM_PORTS - 2)
+
+static void dsa_loop_phydevs_unregister(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < NUM_FIXED_PHYS; i++)
+		if (!IS_ERR(phydevs[i])) {
+			fixed_phy_unregister(phydevs[i]);
+			phy_device_free(phydevs[i]);
+		}
+}
+
+static int __init dsa_loop_init(void)
+{
+	struct fixed_phy_status status = {
+		.link = 1,
+		.speed = SPEED_100,
+		.duplex = DUPLEX_FULL,
+	};
+	unsigned int i, ret;
+
+	for (i = 0; i < NUM_FIXED_PHYS; i++)
+		phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
+
+	ret = mdio_driver_register(&dsa_loop_drv);
+	if (ret)
+		dsa_loop_phydevs_unregister();
+
+	return ret;
+}
+module_init(dsa_loop_init);
+
+static void __exit dsa_loop_exit(void)
+{
+	mdio_driver_unregister(&dsa_loop_drv);
+	dsa_loop_phydevs_unregister();
+}
+module_exit(dsa_loop_exit);
+
+MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Fainelli");
+MODULE_DESCRIPTION("DSA loopback driver");