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, 714 insertions, 0 deletions

diff --git a/drivers/staging/octeon/ethernet-tx.c b/drivers/staging/octeon/ethernet-tx.c
new file mode 100644
index 000000000..bbf33b88b
--- /dev/null
+++ b/drivers/staging/octeon/ethernet-tx.c
@@ -0,0 +1,714 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This file is based on code from OCTEON SDK by Cavium Networks.
+ *
+ * Copyright (c) 2003-2010 Cavium Networks
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ip.h>
+#include <linux/ratelimit.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <net/dst.h>
+#ifdef CONFIG_XFRM
+#include <linux/xfrm.h>
+#include <net/xfrm.h>
+#endif /* CONFIG_XFRM */
+
+#include <linux/atomic.h>
+#include <net/sch_generic.h>
+
+#include "octeon-ethernet.h"
+#include "ethernet-defines.h"
+#include "ethernet-tx.h"
+#include "ethernet-util.h"
+
+#define CVM_OCT_SKB_CB(skb)	((u64 *)((skb)->cb))
+
+/*
+ * You can define GET_SKBUFF_QOS() to override how the skbuff output
+ * function determines which output queue is used. The default
+ * implementation always uses the base queue for the port. If, for
+ * example, you wanted to use the skb->priority field, define
+ * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
+ */
+#ifndef GET_SKBUFF_QOS
+#define GET_SKBUFF_QOS(skb) 0
+#endif
+
+static void cvm_oct_tx_do_cleanup(unsigned long arg);
+static DECLARE_TASKLET_OLD(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup);
+
+/* Maximum number of SKBs to try to free per xmit packet. */
+#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
+
+static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
+{
+	int undo;
+
+	undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
+						   MAX_SKB_TO_FREE;
+	if (undo > 0)
+		cvmx_fau_atomic_add32(fau, -undo);
+	skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
+						       -skb_to_free;
+	return skb_to_free;
+}
+
+static void cvm_oct_kick_tx_poll_watchdog(void)
+{
+	union cvmx_ciu_timx ciu_timx;
+
+	ciu_timx.u64 = 0;
+	ciu_timx.s.one_shot = 1;
+	ciu_timx.s.len = cvm_oct_tx_poll_interval;
+	cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
+}
+
+static void cvm_oct_free_tx_skbs(struct net_device *dev)
+{
+	int skb_to_free;
+	int qos, queues_per_port;
+	int total_remaining = 0;
+	unsigned long flags;
+	struct octeon_ethernet *priv = netdev_priv(dev);
+
+	queues_per_port = cvmx_pko_get_num_queues(priv->port);
+	/* Drain any pending packets in the free list */
+	for (qos = 0; qos < queues_per_port; qos++) {
+		if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
+			continue;
+		skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
+						       MAX_SKB_TO_FREE);
+		skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
+							 priv->fau + qos * 4);
+		if (skb_to_free > 0) {
+			struct sk_buff *to_free_list = NULL;
+
+			spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
+			while (skb_to_free > 0) {
+				struct sk_buff *t;
+
+				t = __skb_dequeue(&priv->tx_free_list[qos]);
+				t->next = to_free_list;
+				to_free_list = t;
+				skb_to_free--;
+			}
+			spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
+					       flags);
+			/* Do the actual freeing outside of the lock. */
+			while (to_free_list) {
+				struct sk_buff *t = to_free_list;
+
+				to_free_list = to_free_list->next;
+				dev_kfree_skb_any(t);
+			}
+		}
+		total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
+	}
+	if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
+		netif_wake_queue(dev);
+	if (total_remaining)
+		cvm_oct_kick_tx_poll_watchdog();
+}
+
+/**
+ * cvm_oct_xmit - transmit a packet
+ * @skb:    Packet to send
+ * @dev:    Device info structure
+ *
+ * Returns Always returns NETDEV_TX_OK
+ */
+netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	union cvmx_pko_command_word0 pko_command;
+	union cvmx_buf_ptr hw_buffer;
+	u64 old_scratch;
+	u64 old_scratch2;
+	int qos;
+	int i;
+	enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
+	struct octeon_ethernet *priv = netdev_priv(dev);
+	struct sk_buff *to_free_list;
+	int skb_to_free;
+	int buffers_to_free;
+	u32 total_to_clean;
+	unsigned long flags;
+#if REUSE_SKBUFFS_WITHOUT_FREE
+	unsigned char *fpa_head;
+#endif
+
+	/*
+	 * Prefetch the private data structure.  It is larger than the
+	 * one cache line.
+	 */
+	prefetch(priv);
+
+	/*
+	 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
+	 * completely remove "qos" in the event neither interface
+	 * supports multiple queues per port.
+	 */
+	if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
+	    (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
+		qos = GET_SKBUFF_QOS(skb);
+		if (qos <= 0)
+			qos = 0;
+		else if (qos >= cvmx_pko_get_num_queues(priv->port))
+			qos = 0;
+	} else {
+		qos = 0;
+	}
+
+	if (USE_ASYNC_IOBDMA) {
+		/* Save scratch in case userspace is using it */
+		CVMX_SYNCIOBDMA;
+		old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
+		old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
+
+		/*
+		 * Fetch and increment the number of packets to be
+		 * freed.
+		 */
+		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
+					       FAU_NUM_PACKET_BUFFERS_TO_FREE,
+					       0);
+		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
+					       priv->fau + qos * 4,
+					       MAX_SKB_TO_FREE);
+	}
+
+	/*
+	 * We have space for 6 segment pointers, If there will be more
+	 * than that, we must linearize.
+	 */
+	if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
+		if (unlikely(__skb_linearize(skb))) {
+			queue_type = QUEUE_DROP;
+			if (USE_ASYNC_IOBDMA) {
+				/*
+				 * Get the number of skbuffs in use
+				 * by the hardware
+				 */
+				CVMX_SYNCIOBDMA;
+				skb_to_free =
+					cvmx_scratch_read64(CVMX_SCR_SCRATCH);
+			} else {
+				/*
+				 * Get the number of skbuffs in use
+				 * by the hardware
+				 */
+				skb_to_free =
+				     cvmx_fau_fetch_and_add32(priv->fau +
+							      qos * 4,
+							      MAX_SKB_TO_FREE);
+			}
+			skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
+								 priv->fau +
+								 qos * 4);
+			spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
+			goto skip_xmit;
+		}
+	}
+
+	/*
+	 * The CN3XXX series of parts has an errata (GMX-401) which
+	 * causes the GMX block to hang if a collision occurs towards
+	 * the end of a <68 byte packet. As a workaround for this, we
+	 * pad packets to be 68 bytes whenever we are in half duplex
+	 * mode. We don't handle the case of having a small packet but
+	 * no room to add the padding.  The kernel should always give
+	 * us at least a cache line
+	 */
+	if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
+		union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
+		int interface = INTERFACE(priv->port);
+		int index = INDEX(priv->port);
+
+		if (interface < 2) {
+			/* We only need to pad packet in half duplex mode */
+			gmx_prt_cfg.u64 =
+			    cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
+			if (gmx_prt_cfg.s.duplex == 0) {
+				int add_bytes = 64 - skb->len;
+
+				if ((skb_tail_pointer(skb) + add_bytes) <=
+				    skb_end_pointer(skb))
+					__skb_put_zero(skb, add_bytes);
+			}
+		}
+	}
+
+	/* Build the PKO command */
+	pko_command.u64 = 0;
+#ifdef __LITTLE_ENDIAN
+	pko_command.s.le = 1;
+#endif
+	pko_command.s.n2 = 1;	/* Don't pollute L2 with the outgoing packet */
+	pko_command.s.segs = 1;
+	pko_command.s.total_bytes = skb->len;
+	pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
+	pko_command.s.subone0 = 1;
+
+	pko_command.s.dontfree = 1;
+
+	/* Build the PKO buffer pointer */
+	hw_buffer.u64 = 0;
+	if (skb_shinfo(skb)->nr_frags == 0) {
+		hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
+		hw_buffer.s.pool = 0;
+		hw_buffer.s.size = skb->len;
+	} else {
+		hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
+		hw_buffer.s.pool = 0;
+		hw_buffer.s.size = skb_headlen(skb);
+		CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
+		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+			skb_frag_t *fs = skb_shinfo(skb)->frags + i;
+
+			hw_buffer.s.addr =
+				XKPHYS_TO_PHYS((uintptr_t)skb_frag_address(fs));
+			hw_buffer.s.size = skb_frag_size(fs);
+			CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
+		}
+		hw_buffer.s.addr =
+			XKPHYS_TO_PHYS((uintptr_t)CVM_OCT_SKB_CB(skb));
+		hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
+		pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
+		pko_command.s.gather = 1;
+		goto dont_put_skbuff_in_hw;
+	}
+
+	/*
+	 * See if we can put this skb in the FPA pool. Any strange
+	 * behavior from the Linux networking stack will most likely
+	 * be caused by a bug in the following code. If some field is
+	 * in use by the network stack and gets carried over when a
+	 * buffer is reused, bad things may happen.  If in doubt and
+	 * you dont need the absolute best performance, disable the
+	 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
+	 * shown a 25% increase in performance under some loads.
+	 */
+#if REUSE_SKBUFFS_WITHOUT_FREE
+	fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
+	if (unlikely(skb->data < fpa_head)) {
+		/* TX buffer beginning can't meet FPA alignment constraints */
+		goto dont_put_skbuff_in_hw;
+	}
+	if (unlikely
+	    ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
+		/* TX buffer isn't large enough for the FPA */
+		goto dont_put_skbuff_in_hw;
+	}
+	if (unlikely(skb_shared(skb))) {
+		/* TX buffer sharing data with someone else */
+		goto dont_put_skbuff_in_hw;
+	}
+	if (unlikely(skb_cloned(skb))) {
+		/* TX buffer has been cloned */
+		goto dont_put_skbuff_in_hw;
+	}
+	if (unlikely(skb_header_cloned(skb))) {
+		/* TX buffer header has been cloned */
+		goto dont_put_skbuff_in_hw;
+	}
+	if (unlikely(skb->destructor)) {
+		/* TX buffer has a destructor */
+		goto dont_put_skbuff_in_hw;
+	}
+	if (unlikely(skb_shinfo(skb)->nr_frags)) {
+		/* TX buffer has fragments */
+		goto dont_put_skbuff_in_hw;
+	}
+	if (unlikely
+	    (skb->truesize !=
+	     sizeof(*skb) + skb_end_offset(skb))) {
+		/* TX buffer truesize has been changed */
+		goto dont_put_skbuff_in_hw;
+	}
+
+	/*
+	 * We can use this buffer in the FPA.  We don't need the FAU
+	 * update anymore
+	 */
+	pko_command.s.dontfree = 0;
+
+	hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
+			   ((unsigned long)fpa_head >> 7);
+
+	*(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
+
+	/*
+	 * The skbuff will be reused without ever being freed. We must
+	 * cleanup a bunch of core things.
+	 */
+	dst_release(skb_dst(skb));
+	skb_dst_set(skb, NULL);
+	skb_ext_reset(skb);
+	nf_reset_ct(skb);
+	skb_reset_redirect(skb);
+
+#ifdef CONFIG_NET_SCHED
+	skb->tc_index = 0;
+#endif /* CONFIG_NET_SCHED */
+#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
+
+dont_put_skbuff_in_hw:
+
+	/* Check if we can use the hardware checksumming */
+	if ((skb->protocol == htons(ETH_P_IP)) &&
+	    (ip_hdr(skb)->version == 4) &&
+	    (ip_hdr(skb)->ihl == 5) &&
+	    ((ip_hdr(skb)->frag_off == 0) ||
+	     (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
+	    ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
+	     (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
+		/* Use hardware checksum calc */
+		pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
+	}
+
+	if (USE_ASYNC_IOBDMA) {
+		/* Get the number of skbuffs in use by the hardware */
+		CVMX_SYNCIOBDMA;
+		skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
+		buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
+	} else {
+		/* Get the number of skbuffs in use by the hardware */
+		skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
+						       MAX_SKB_TO_FREE);
+		buffers_to_free =
+		    cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
+	}
+
+	skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
+						 priv->fau + qos * 4);
+
+	/*
+	 * If we're sending faster than the receive can free them then
+	 * don't do the HW free.
+	 */
+	if ((buffers_to_free < -100) && !pko_command.s.dontfree)
+		pko_command.s.dontfree = 1;
+
+	if (pko_command.s.dontfree) {
+		queue_type = QUEUE_CORE;
+		pko_command.s.reg0 = priv->fau + qos * 4;
+	} else {
+		queue_type = QUEUE_HW;
+	}
+	if (USE_ASYNC_IOBDMA)
+		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
+					       FAU_TOTAL_TX_TO_CLEAN, 1);
+
+	spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
+
+	/* Drop this packet if we have too many already queued to the HW */
+	if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
+		     MAX_OUT_QUEUE_DEPTH)) {
+		if (dev->tx_queue_len != 0) {
+			/* Drop the lock when notifying the core.  */
+			spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
+					       flags);
+			netif_stop_queue(dev);
+			spin_lock_irqsave(&priv->tx_free_list[qos].lock,
+					  flags);
+		} else {
+			/* If not using normal queueing.  */
+			queue_type = QUEUE_DROP;
+			goto skip_xmit;
+		}
+	}
+
+	cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
+				     CVMX_PKO_LOCK_NONE);
+
+	/* Send the packet to the output queue */
+	if (unlikely(cvmx_pko_send_packet_finish(priv->port,
+						 priv->queue + qos,
+						 pko_command, hw_buffer,
+						 CVMX_PKO_LOCK_NONE))) {
+		printk_ratelimited("%s: Failed to send the packet\n",
+				   dev->name);
+		queue_type = QUEUE_DROP;
+	}
+skip_xmit:
+	to_free_list = NULL;
+
+	switch (queue_type) {
+	case QUEUE_DROP:
+		skb->next = to_free_list;
+		to_free_list = skb;
+		dev->stats.tx_dropped++;
+		break;
+	case QUEUE_HW:
+		cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
+		break;
+	case QUEUE_CORE:
+		__skb_queue_tail(&priv->tx_free_list[qos], skb);
+		break;
+	default:
+		BUG();
+	}
+
+	while (skb_to_free > 0) {
+		struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
+
+		t->next = to_free_list;
+		to_free_list = t;
+		skb_to_free--;
+	}
+
+	spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
+
+	/* Do the actual freeing outside of the lock. */
+	while (to_free_list) {
+		struct sk_buff *t = to_free_list;
+
+		to_free_list = to_free_list->next;
+		dev_kfree_skb_any(t);
+	}
+
+	if (USE_ASYNC_IOBDMA) {
+		CVMX_SYNCIOBDMA;
+		total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
+		/* Restore the scratch area */
+		cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
+		cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
+	} else {
+		total_to_clean =
+			cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
+	}
+
+	if (total_to_clean & 0x3ff) {
+		/*
+		 * Schedule the cleanup tasklet every 1024 packets for
+		 * the pathological case of high traffic on one port
+		 * delaying clean up of packets on a different port
+		 * that is blocked waiting for the cleanup.
+		 */
+		tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
+	}
+
+	cvm_oct_kick_tx_poll_watchdog();
+
+	return NETDEV_TX_OK;
+}
+
+/**
+ * cvm_oct_xmit_pow - transmit a packet to the POW
+ * @skb:    Packet to send
+ * @dev:    Device info structure
+ * Returns Always returns zero
+ */
+netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
+{
+	struct octeon_ethernet *priv = netdev_priv(dev);
+	void *packet_buffer;
+	void *copy_location;
+
+	/* Get a work queue entry */
+	struct cvmx_wqe *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
+
+	if (unlikely(!work)) {
+		printk_ratelimited("%s: Failed to allocate a work queue entry\n",
+				   dev->name);
+		dev->stats.tx_dropped++;
+		dev_kfree_skb_any(skb);
+		return 0;
+	}
+
+	/* Get a packet buffer */
+	packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
+	if (unlikely(!packet_buffer)) {
+		printk_ratelimited("%s: Failed to allocate a packet buffer\n",
+				   dev->name);
+		cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
+		dev->stats.tx_dropped++;
+		dev_kfree_skb_any(skb);
+		return 0;
+	}
+
+	/*
+	 * Calculate where we need to copy the data to. We need to
+	 * leave 8 bytes for a next pointer (unused). We also need to
+	 * include any configure skip. Then we need to align the IP
+	 * packet src and dest into the same 64bit word. The below
+	 * calculation may add a little extra, but that doesn't
+	 * hurt.
+	 */
+	copy_location = packet_buffer + sizeof(u64);
+	copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
+
+	/*
+	 * We have to copy the packet since whoever processes this
+	 * packet will free it to a hardware pool. We can't use the
+	 * trick of counting outstanding packets like in
+	 * cvm_oct_xmit.
+	 */
+	memcpy(copy_location, skb->data, skb->len);
+
+	/*
+	 * Fill in some of the work queue fields. We may need to add
+	 * more if the software at the other end needs them.
+	 */
+	if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
+		work->word0.pip.cn38xx.hw_chksum = skb->csum;
+	work->word1.len = skb->len;
+	cvmx_wqe_set_port(work, priv->port);
+	cvmx_wqe_set_qos(work, priv->port & 0x7);
+	cvmx_wqe_set_grp(work, pow_send_group);
+	work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
+	work->word1.tag = pow_send_group;	/* FIXME */
+	/* Default to zero. Sets of zero later are commented out */
+	work->word2.u64 = 0;
+	work->word2.s.bufs = 1;
+	work->packet_ptr.u64 = 0;
+	work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
+	work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
+	work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
+	work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
+
+	if (skb->protocol == htons(ETH_P_IP)) {
+		work->word2.s.ip_offset = 14;
+#if 0
+		work->word2.s.vlan_valid = 0;	/* FIXME */
+		work->word2.s.vlan_cfi = 0;	/* FIXME */
+		work->word2.s.vlan_id = 0;	/* FIXME */
+		work->word2.s.dec_ipcomp = 0;	/* FIXME */
+#endif
+		work->word2.s.tcp_or_udp =
+		    (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
+		    (ip_hdr(skb)->protocol == IPPROTO_UDP);
+#if 0
+		/* FIXME */
+		work->word2.s.dec_ipsec = 0;
+		/* We only support IPv4 right now */
+		work->word2.s.is_v6 = 0;
+		/* Hardware would set to zero */
+		work->word2.s.software = 0;
+		/* No error, packet is internal */
+		work->word2.s.L4_error = 0;
+#endif
+		work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
+					  (ip_hdr(skb)->frag_off ==
+					      cpu_to_be16(1 << 14)));
+#if 0
+		/* Assume Linux is sending a good packet */
+		work->word2.s.IP_exc = 0;
+#endif
+		work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
+		work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
+#if 0
+		/* This is an IP packet */
+		work->word2.s.not_IP = 0;
+		/* No error, packet is internal */
+		work->word2.s.rcv_error = 0;
+		/* No error, packet is internal */
+		work->word2.s.err_code = 0;
+#endif
+
+		/*
+		 * When copying the data, include 4 bytes of the
+		 * ethernet header to align the same way hardware
+		 * does.
+		 */
+		memcpy(work->packet_data, skb->data + 10,
+		       sizeof(work->packet_data));
+	} else {
+#if 0
+		work->word2.snoip.vlan_valid = 0;	/* FIXME */
+		work->word2.snoip.vlan_cfi = 0;	/* FIXME */
+		work->word2.snoip.vlan_id = 0;	/* FIXME */
+		work->word2.snoip.software = 0;	/* Hardware would set to zero */
+#endif
+		work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
+		work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
+		work->word2.snoip.is_bcast =
+		    (skb->pkt_type == PACKET_BROADCAST);
+		work->word2.snoip.is_mcast =
+		    (skb->pkt_type == PACKET_MULTICAST);
+		work->word2.snoip.not_IP = 1;	/* IP was done up above */
+#if 0
+		/* No error, packet is internal */
+		work->word2.snoip.rcv_error = 0;
+		/* No error, packet is internal */
+		work->word2.snoip.err_code = 0;
+#endif
+		memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
+	}
+
+	/* Submit the packet to the POW */
+	cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
+			     cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+	dev_consume_skb_any(skb);
+	return 0;
+}
+
+/**
+ * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
+ * @dev:    Device being shutdown
+ *
+ */
+void cvm_oct_tx_shutdown_dev(struct net_device *dev)
+{
+	struct octeon_ethernet *priv = netdev_priv(dev);
+	unsigned long flags;
+	int qos;
+
+	for (qos = 0; qos < 16; qos++) {
+		spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
+		while (skb_queue_len(&priv->tx_free_list[qos]))
+			dev_kfree_skb_any(__skb_dequeue
+					  (&priv->tx_free_list[qos]));
+		spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
+	}
+}
+
+static void cvm_oct_tx_do_cleanup(unsigned long arg)
+{
+	int port;
+
+	for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
+		if (cvm_oct_device[port]) {
+			struct net_device *dev = cvm_oct_device[port];
+
+			cvm_oct_free_tx_skbs(dev);
+		}
+	}
+}
+
+static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
+{
+	/* Disable the interrupt.  */
+	cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
+	/* Do the work in the tasklet.  */
+	tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
+	return IRQ_HANDLED;
+}
+
+void cvm_oct_tx_initialize(void)
+{
+	int i;
+
+	/* Disable the interrupt.  */
+	cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
+	/* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
+	i = request_irq(OCTEON_IRQ_TIMER1,
+			cvm_oct_tx_cleanup_watchdog, 0,
+			"Ethernet", cvm_oct_device);
+
+	if (i)
+		panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
+}
+
+void cvm_oct_tx_shutdown(void)
+{
+	/* Free the interrupt handler */
+	free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
+}