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, 553 insertions, 0 deletions

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
new file mode 100644
index 000000000..8037ec9b1
--- /dev/null
+++ b/net/sched/act_mirred.c
@@ -0,0 +1,553 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/act_mirred.c	packet mirroring and redirect actions
+ *
+ * Authors:	Jamal Hadi Salim (2002-4)
+ *
+ * TODO: Add ingress support (and socket redirect support)
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <linux/if_arp.h>
+#include <net/net_namespace.h>
+#include <net/netlink.h>
+#include <net/dst.h>
+#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
+#include <linux/tc_act/tc_mirred.h>
+#include <net/tc_act/tc_mirred.h>
+#include <net/tc_wrapper.h>
+
+static LIST_HEAD(mirred_list);
+static DEFINE_SPINLOCK(mirred_list_lock);
+
+#define MIRRED_NEST_LIMIT    4
+static DEFINE_PER_CPU(unsigned int, mirred_nest_level);
+
+static bool tcf_mirred_is_act_redirect(int action)
+{
+	return action == TCA_EGRESS_REDIR || action == TCA_INGRESS_REDIR;
+}
+
+static bool tcf_mirred_act_wants_ingress(int action)
+{
+	switch (action) {
+	case TCA_EGRESS_REDIR:
+	case TCA_EGRESS_MIRROR:
+		return false;
+	case TCA_INGRESS_REDIR:
+	case TCA_INGRESS_MIRROR:
+		return true;
+	default:
+		BUG();
+	}
+}
+
+static bool tcf_mirred_can_reinsert(int action)
+{
+	switch (action) {
+	case TC_ACT_SHOT:
+	case TC_ACT_STOLEN:
+	case TC_ACT_QUEUED:
+	case TC_ACT_TRAP:
+		return true;
+	}
+	return false;
+}
+
+static struct net_device *tcf_mirred_dev_dereference(struct tcf_mirred *m)
+{
+	return rcu_dereference_protected(m->tcfm_dev,
+					 lockdep_is_held(&m->tcf_lock));
+}
+
+static void tcf_mirred_release(struct tc_action *a)
+{
+	struct tcf_mirred *m = to_mirred(a);
+	struct net_device *dev;
+
+	spin_lock(&mirred_list_lock);
+	list_del(&m->tcfm_list);
+	spin_unlock(&mirred_list_lock);
+
+	/* last reference to action, no need to lock */
+	dev = rcu_dereference_protected(m->tcfm_dev, 1);
+	netdev_put(dev, &m->tcfm_dev_tracker);
+}
+
+static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
+	[TCA_MIRRED_PARMS]	= { .len = sizeof(struct tc_mirred) },
+};
+
+static struct tc_action_ops act_mirred_ops;
+
+static int tcf_mirred_init(struct net *net, struct nlattr *nla,
+			   struct nlattr *est, struct tc_action **a,
+			   struct tcf_proto *tp,
+			   u32 flags, struct netlink_ext_ack *extack)
+{
+	struct tc_action_net *tn = net_generic(net, act_mirred_ops.net_id);
+	bool bind = flags & TCA_ACT_FLAGS_BIND;
+	struct nlattr *tb[TCA_MIRRED_MAX + 1];
+	struct tcf_chain *goto_ch = NULL;
+	bool mac_header_xmit = false;
+	struct tc_mirred *parm;
+	struct tcf_mirred *m;
+	bool exists = false;
+	int ret, err;
+	u32 index;
+
+	if (!nla) {
+		NL_SET_ERR_MSG_MOD(extack, "Mirred requires attributes to be passed");
+		return -EINVAL;
+	}
+	ret = nla_parse_nested_deprecated(tb, TCA_MIRRED_MAX, nla,
+					  mirred_policy, extack);
+	if (ret < 0)
+		return ret;
+	if (!tb[TCA_MIRRED_PARMS]) {
+		NL_SET_ERR_MSG_MOD(extack, "Missing required mirred parameters");
+		return -EINVAL;
+	}
+	parm = nla_data(tb[TCA_MIRRED_PARMS]);
+	index = parm->index;
+	err = tcf_idr_check_alloc(tn, &index, a, bind);
+	if (err < 0)
+		return err;
+	exists = err;
+	if (exists && bind)
+		return 0;
+
+	switch (parm->eaction) {
+	case TCA_EGRESS_MIRROR:
+	case TCA_EGRESS_REDIR:
+	case TCA_INGRESS_REDIR:
+	case TCA_INGRESS_MIRROR:
+		break;
+	default:
+		if (exists)
+			tcf_idr_release(*a, bind);
+		else
+			tcf_idr_cleanup(tn, index);
+		NL_SET_ERR_MSG_MOD(extack, "Unknown mirred option");
+		return -EINVAL;
+	}
+
+	if (!exists) {
+		if (!parm->ifindex) {
+			tcf_idr_cleanup(tn, index);
+			NL_SET_ERR_MSG_MOD(extack, "Specified device does not exist");
+			return -EINVAL;
+		}
+		ret = tcf_idr_create_from_flags(tn, index, est, a,
+						&act_mirred_ops, bind, flags);
+		if (ret) {
+			tcf_idr_cleanup(tn, index);
+			return ret;
+		}
+		ret = ACT_P_CREATED;
+	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
+		tcf_idr_release(*a, bind);
+		return -EEXIST;
+	}
+
+	m = to_mirred(*a);
+	if (ret == ACT_P_CREATED)
+		INIT_LIST_HEAD(&m->tcfm_list);
+
+	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
+	if (err < 0)
+		goto release_idr;
+
+	spin_lock_bh(&m->tcf_lock);
+
+	if (parm->ifindex) {
+		struct net_device *odev, *ndev;
+
+		ndev = dev_get_by_index(net, parm->ifindex);
+		if (!ndev) {
+			spin_unlock_bh(&m->tcf_lock);
+			err = -ENODEV;
+			goto put_chain;
+		}
+		mac_header_xmit = dev_is_mac_header_xmit(ndev);
+		odev = rcu_replace_pointer(m->tcfm_dev, ndev,
+					  lockdep_is_held(&m->tcf_lock));
+		netdev_put(odev, &m->tcfm_dev_tracker);
+		netdev_tracker_alloc(ndev, &m->tcfm_dev_tracker, GFP_ATOMIC);
+		m->tcfm_mac_header_xmit = mac_header_xmit;
+	}
+	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
+	m->tcfm_eaction = parm->eaction;
+	spin_unlock_bh(&m->tcf_lock);
+	if (goto_ch)
+		tcf_chain_put_by_act(goto_ch);
+
+	if (ret == ACT_P_CREATED) {
+		spin_lock(&mirred_list_lock);
+		list_add(&m->tcfm_list, &mirred_list);
+		spin_unlock(&mirred_list_lock);
+	}
+
+	return ret;
+put_chain:
+	if (goto_ch)
+		tcf_chain_put_by_act(goto_ch);
+release_idr:
+	tcf_idr_release(*a, bind);
+	return err;
+}
+
+static bool is_mirred_nested(void)
+{
+	return unlikely(__this_cpu_read(mirred_nest_level) > 1);
+}
+
+static int tcf_mirred_forward(bool want_ingress, struct sk_buff *skb)
+{
+	int err;
+
+	if (!want_ingress)
+		err = tcf_dev_queue_xmit(skb, dev_queue_xmit);
+	else if (is_mirred_nested())
+		err = netif_rx(skb);
+	else
+		err = netif_receive_skb(skb);
+
+	return err;
+}
+
+TC_INDIRECT_SCOPE int tcf_mirred_act(struct sk_buff *skb,
+				     const struct tc_action *a,
+				     struct tcf_result *res)
+{
+	struct tcf_mirred *m = to_mirred(a);
+	struct sk_buff *skb2 = skb;
+	bool m_mac_header_xmit;
+	struct net_device *dev;
+	unsigned int nest_level;
+	int retval, err = 0;
+	bool use_reinsert;
+	bool want_ingress;
+	bool is_redirect;
+	bool expects_nh;
+	bool at_ingress;
+	int m_eaction;
+	int mac_len;
+	bool at_nh;
+
+	nest_level = __this_cpu_inc_return(mirred_nest_level);
+	if (unlikely(nest_level > MIRRED_NEST_LIMIT)) {
+		net_warn_ratelimited("Packet exceeded mirred recursion limit on dev %s\n",
+				     netdev_name(skb->dev));
+		__this_cpu_dec(mirred_nest_level);
+		return TC_ACT_SHOT;
+	}
+
+	tcf_lastuse_update(&m->tcf_tm);
+	tcf_action_update_bstats(&m->common, skb);
+
+	m_mac_header_xmit = READ_ONCE(m->tcfm_mac_header_xmit);
+	m_eaction = READ_ONCE(m->tcfm_eaction);
+	retval = READ_ONCE(m->tcf_action);
+	dev = rcu_dereference_bh(m->tcfm_dev);
+	if (unlikely(!dev)) {
+		pr_notice_once("tc mirred: target device is gone\n");
+		goto out;
+	}
+
+	if (unlikely(!(dev->flags & IFF_UP))) {
+		net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
+				       dev->name);
+		goto out;
+	}
+
+	/* we could easily avoid the clone only if called by ingress and clsact;
+	 * since we can't easily detect the clsact caller, skip clone only for
+	 * ingress - that covers the TC S/W datapath.
+	 */
+	is_redirect = tcf_mirred_is_act_redirect(m_eaction);
+	at_ingress = skb_at_tc_ingress(skb);
+	use_reinsert = at_ingress && is_redirect &&
+		       tcf_mirred_can_reinsert(retval);
+	if (!use_reinsert) {
+		skb2 = skb_clone(skb, GFP_ATOMIC);
+		if (!skb2)
+			goto out;
+	}
+
+	want_ingress = tcf_mirred_act_wants_ingress(m_eaction);
+
+	/* All mirred/redirected skbs should clear previous ct info */
+	nf_reset_ct(skb2);
+	if (want_ingress && !at_ingress) /* drop dst for egress -> ingress */
+		skb_dst_drop(skb2);
+
+	expects_nh = want_ingress || !m_mac_header_xmit;
+	at_nh = skb->data == skb_network_header(skb);
+	if (at_nh != expects_nh) {
+		mac_len = skb_at_tc_ingress(skb) ? skb->mac_len :
+			  skb_network_header(skb) - skb_mac_header(skb);
+		if (expects_nh) {
+			/* target device/action expect data at nh */
+			skb_pull_rcsum(skb2, mac_len);
+		} else {
+			/* target device/action expect data at mac */
+			skb_push_rcsum(skb2, mac_len);
+		}
+	}
+
+	skb2->skb_iif = skb->dev->ifindex;
+	skb2->dev = dev;
+
+	/* mirror is always swallowed */
+	if (is_redirect) {
+		skb_set_redirected(skb2, skb2->tc_at_ingress);
+
+		/* let's the caller reinsert the packet, if possible */
+		if (use_reinsert) {
+			err = tcf_mirred_forward(want_ingress, skb);
+			if (err)
+				tcf_action_inc_overlimit_qstats(&m->common);
+			__this_cpu_dec(mirred_nest_level);
+			return TC_ACT_CONSUMED;
+		}
+	}
+
+	err = tcf_mirred_forward(want_ingress, skb2);
+	if (err) {
+out:
+		tcf_action_inc_overlimit_qstats(&m->common);
+		if (tcf_mirred_is_act_redirect(m_eaction))
+			retval = TC_ACT_SHOT;
+	}
+	__this_cpu_dec(mirred_nest_level);
+
+	return retval;
+}
+
+static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
+			     u64 drops, u64 lastuse, bool hw)
+{
+	struct tcf_mirred *m = to_mirred(a);
+	struct tcf_t *tm = &m->tcf_tm;
+
+	tcf_action_update_stats(a, bytes, packets, drops, hw);
+	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
+}
+
+static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind,
+			   int ref)
+{
+	unsigned char *b = skb_tail_pointer(skb);
+	struct tcf_mirred *m = to_mirred(a);
+	struct tc_mirred opt = {
+		.index   = m->tcf_index,
+		.refcnt  = refcount_read(&m->tcf_refcnt) - ref,
+		.bindcnt = atomic_read(&m->tcf_bindcnt) - bind,
+	};
+	struct net_device *dev;
+	struct tcf_t t;
+
+	spin_lock_bh(&m->tcf_lock);
+	opt.action = m->tcf_action;
+	opt.eaction = m->tcfm_eaction;
+	dev = tcf_mirred_dev_dereference(m);
+	if (dev)
+		opt.ifindex = dev->ifindex;
+
+	if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt))
+		goto nla_put_failure;
+
+	tcf_tm_dump(&t, &m->tcf_tm);
+	if (nla_put_64bit(skb, TCA_MIRRED_TM, sizeof(t), &t, TCA_MIRRED_PAD))
+		goto nla_put_failure;
+	spin_unlock_bh(&m->tcf_lock);
+
+	return skb->len;
+
+nla_put_failure:
+	spin_unlock_bh(&m->tcf_lock);
+	nlmsg_trim(skb, b);
+	return -1;
+}
+
+static int mirred_device_event(struct notifier_block *unused,
+			       unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct tcf_mirred *m;
+
+	ASSERT_RTNL();
+	if (event == NETDEV_UNREGISTER) {
+		spin_lock(&mirred_list_lock);
+		list_for_each_entry(m, &mirred_list, tcfm_list) {
+			spin_lock_bh(&m->tcf_lock);
+			if (tcf_mirred_dev_dereference(m) == dev) {
+				netdev_put(dev, &m->tcfm_dev_tracker);
+				/* Note : no rcu grace period necessary, as
+				 * net_device are already rcu protected.
+				 */
+				RCU_INIT_POINTER(m->tcfm_dev, NULL);
+			}
+			spin_unlock_bh(&m->tcf_lock);
+		}
+		spin_unlock(&mirred_list_lock);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block mirred_device_notifier = {
+	.notifier_call = mirred_device_event,
+};
+
+static void tcf_mirred_dev_put(void *priv)
+{
+	struct net_device *dev = priv;
+
+	dev_put(dev);
+}
+
+static struct net_device *
+tcf_mirred_get_dev(const struct tc_action *a,
+		   tc_action_priv_destructor *destructor)
+{
+	struct tcf_mirred *m = to_mirred(a);
+	struct net_device *dev;
+
+	rcu_read_lock();
+	dev = rcu_dereference(m->tcfm_dev);
+	if (dev) {
+		dev_hold(dev);
+		*destructor = tcf_mirred_dev_put;
+	}
+	rcu_read_unlock();
+
+	return dev;
+}
+
+static size_t tcf_mirred_get_fill_size(const struct tc_action *act)
+{
+	return nla_total_size(sizeof(struct tc_mirred));
+}
+
+static void tcf_offload_mirred_get_dev(struct flow_action_entry *entry,
+				       const struct tc_action *act)
+{
+	entry->dev = act->ops->get_dev(act, &entry->destructor);
+	if (!entry->dev)
+		return;
+	entry->destructor_priv = entry->dev;
+}
+
+static int tcf_mirred_offload_act_setup(struct tc_action *act, void *entry_data,
+					u32 *index_inc, bool bind,
+					struct netlink_ext_ack *extack)
+{
+	if (bind) {
+		struct flow_action_entry *entry = entry_data;
+
+		if (is_tcf_mirred_egress_redirect(act)) {
+			entry->id = FLOW_ACTION_REDIRECT;
+			tcf_offload_mirred_get_dev(entry, act);
+		} else if (is_tcf_mirred_egress_mirror(act)) {
+			entry->id = FLOW_ACTION_MIRRED;
+			tcf_offload_mirred_get_dev(entry, act);
+		} else if (is_tcf_mirred_ingress_redirect(act)) {
+			entry->id = FLOW_ACTION_REDIRECT_INGRESS;
+			tcf_offload_mirred_get_dev(entry, act);
+		} else if (is_tcf_mirred_ingress_mirror(act)) {
+			entry->id = FLOW_ACTION_MIRRED_INGRESS;
+			tcf_offload_mirred_get_dev(entry, act);
+		} else {
+			NL_SET_ERR_MSG_MOD(extack, "Unsupported mirred offload");
+			return -EOPNOTSUPP;
+		}
+		*index_inc = 1;
+	} else {
+		struct flow_offload_action *fl_action = entry_data;
+
+		if (is_tcf_mirred_egress_redirect(act))
+			fl_action->id = FLOW_ACTION_REDIRECT;
+		else if (is_tcf_mirred_egress_mirror(act))
+			fl_action->id = FLOW_ACTION_MIRRED;
+		else if (is_tcf_mirred_ingress_redirect(act))
+			fl_action->id = FLOW_ACTION_REDIRECT_INGRESS;
+		else if (is_tcf_mirred_ingress_mirror(act))
+			fl_action->id = FLOW_ACTION_MIRRED_INGRESS;
+		else
+			return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static struct tc_action_ops act_mirred_ops = {
+	.kind		=	"mirred",
+	.id		=	TCA_ID_MIRRED,
+	.owner		=	THIS_MODULE,
+	.act		=	tcf_mirred_act,
+	.stats_update	=	tcf_stats_update,
+	.dump		=	tcf_mirred_dump,
+	.cleanup	=	tcf_mirred_release,
+	.init		=	tcf_mirred_init,
+	.get_fill_size	=	tcf_mirred_get_fill_size,
+	.offload_act_setup =	tcf_mirred_offload_act_setup,
+	.size		=	sizeof(struct tcf_mirred),
+	.get_dev	=	tcf_mirred_get_dev,
+};
+
+static __net_init int mirred_init_net(struct net *net)
+{
+	struct tc_action_net *tn = net_generic(net, act_mirred_ops.net_id);
+
+	return tc_action_net_init(net, tn, &act_mirred_ops);
+}
+
+static void __net_exit mirred_exit_net(struct list_head *net_list)
+{
+	tc_action_net_exit(net_list, act_mirred_ops.net_id);
+}
+
+static struct pernet_operations mirred_net_ops = {
+	.init = mirred_init_net,
+	.exit_batch = mirred_exit_net,
+	.id   = &act_mirred_ops.net_id,
+	.size = sizeof(struct tc_action_net),
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002)");
+MODULE_DESCRIPTION("Device Mirror/redirect actions");
+MODULE_LICENSE("GPL");
+
+static int __init mirred_init_module(void)
+{
+	int err = register_netdevice_notifier(&mirred_device_notifier);
+	if (err)
+		return err;
+
+	pr_info("Mirror/redirect action on\n");
+	err = tcf_register_action(&act_mirred_ops, &mirred_net_ops);
+	if (err)
+		unregister_netdevice_notifier(&mirred_device_notifier);
+
+	return err;
+}
+
+static void __exit mirred_cleanup_module(void)
+{
+	tcf_unregister_action(&act_mirred_ops, &mirred_net_ops);
+	unregister_netdevice_notifier(&mirred_device_notifier);
+}
+
+module_init(mirred_init_module);
+module_exit(mirred_cleanup_module);