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, 681 insertions, 0 deletions

diff --git a/drivers/net/wireless/broadcom/b43legacy/pio.c b/drivers/net/wireless/broadcom/b43legacy/pio.c
new file mode 100644
index 000000000..aac413d0f
--- /dev/null
+++ b/drivers/net/wireless/broadcom/b43legacy/pio.c
@@ -0,0 +1,681 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+
+  Broadcom B43legacy wireless driver
+
+  PIO Transmission
+
+  Copyright (c) 2005 Michael Buesch <m@bues.ch>
+
+
+*/
+
+#include "b43legacy.h"
+#include "pio.h"
+#include "main.h"
+#include "xmit.h"
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+
+static void tx_start(struct b43legacy_pioqueue *queue)
+{
+	b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
+			    B43legacy_PIO_TXCTL_INIT);
+}
+
+static void tx_octet(struct b43legacy_pioqueue *queue,
+		     u8 octet)
+{
+	if (queue->need_workarounds) {
+		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
+		b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
+				    B43legacy_PIO_TXCTL_WRITELO);
+	} else {
+		b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
+				    B43legacy_PIO_TXCTL_WRITELO);
+		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
+	}
+}
+
+static u16 tx_get_next_word(const u8 *txhdr,
+			    const u8 *packet,
+			    size_t txhdr_size,
+			    unsigned int *pos)
+{
+	const u8 *source;
+	unsigned int i = *pos;
+	u16 ret;
+
+	if (i < txhdr_size)
+		source = txhdr;
+	else {
+		source = packet;
+		i -= txhdr_size;
+	}
+	ret = le16_to_cpu(*((__le16 *)(source + i)));
+	*pos += 2;
+
+	return ret;
+}
+
+static void tx_data(struct b43legacy_pioqueue *queue,
+		    u8 *txhdr,
+		    const u8 *packet,
+		    unsigned int octets)
+{
+	u16 data;
+	unsigned int i = 0;
+
+	if (queue->need_workarounds) {
+		data = tx_get_next_word(txhdr, packet,
+					sizeof(struct b43legacy_txhdr_fw3), &i);
+		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
+	}
+	b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
+			    B43legacy_PIO_TXCTL_WRITELO |
+			    B43legacy_PIO_TXCTL_WRITEHI);
+	while (i < octets - 1) {
+		data = tx_get_next_word(txhdr, packet,
+					sizeof(struct b43legacy_txhdr_fw3), &i);
+		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
+	}
+	if (octets % 2)
+		tx_octet(queue, packet[octets -
+			 sizeof(struct b43legacy_txhdr_fw3) - 1]);
+}
+
+static void tx_complete(struct b43legacy_pioqueue *queue,
+			struct sk_buff *skb)
+{
+	if (queue->need_workarounds) {
+		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA,
+				    skb->data[skb->len - 1]);
+		b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
+				    B43legacy_PIO_TXCTL_WRITELO |
+				    B43legacy_PIO_TXCTL_COMPLETE);
+	} else
+		b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
+				    B43legacy_PIO_TXCTL_COMPLETE);
+}
+
+static u16 generate_cookie(struct b43legacy_pioqueue *queue,
+			   struct b43legacy_pio_txpacket *packet)
+{
+	u16 cookie = 0x0000;
+	int packetindex;
+
+	/* We use the upper 4 bits for the PIO
+	 * controller ID and the lower 12 bits
+	 * for the packet index (in the cache).
+	 */
+	switch (queue->mmio_base) {
+	case B43legacy_MMIO_PIO1_BASE:
+		break;
+	case B43legacy_MMIO_PIO2_BASE:
+		cookie = 0x1000;
+		break;
+	case B43legacy_MMIO_PIO3_BASE:
+		cookie = 0x2000;
+		break;
+	case B43legacy_MMIO_PIO4_BASE:
+		cookie = 0x3000;
+		break;
+	default:
+		B43legacy_WARN_ON(1);
+	}
+	packetindex = pio_txpacket_getindex(packet);
+	B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000));
+	cookie |= (u16)packetindex;
+
+	return cookie;
+}
+
+static
+struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev,
+					u16 cookie,
+					struct b43legacy_pio_txpacket **packet)
+{
+	struct b43legacy_pio *pio = &dev->pio;
+	struct b43legacy_pioqueue *queue = NULL;
+	int packetindex;
+
+	switch (cookie & 0xF000) {
+	case 0x0000:
+		queue = pio->queue0;
+		break;
+	case 0x1000:
+		queue = pio->queue1;
+		break;
+	case 0x2000:
+		queue = pio->queue2;
+		break;
+	case 0x3000:
+		queue = pio->queue3;
+		break;
+	default:
+		B43legacy_WARN_ON(1);
+	}
+	packetindex = (cookie & 0x0FFF);
+	B43legacy_WARN_ON(!(packetindex >= 0 && packetindex
+			  < B43legacy_PIO_MAXTXPACKETS));
+	*packet = &(queue->tx_packets_cache[packetindex]);
+
+	return queue;
+}
+
+union txhdr_union {
+	struct b43legacy_txhdr_fw3 txhdr_fw3;
+};
+
+static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue,
+				  struct sk_buff *skb,
+				  struct b43legacy_pio_txpacket *packet,
+				  size_t txhdr_size)
+{
+	union txhdr_union txhdr_data;
+	u8 *txhdr = NULL;
+	unsigned int octets;
+	int err;
+
+	txhdr = (u8 *)(&txhdr_data.txhdr_fw3);
+
+	B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
+	err = b43legacy_generate_txhdr(queue->dev,
+				 txhdr, skb->data, skb->len,
+				 IEEE80211_SKB_CB(skb),
+				 generate_cookie(queue, packet));
+	if (err)
+		return err;
+
+	tx_start(queue);
+	octets = skb->len + txhdr_size;
+	if (queue->need_workarounds)
+		octets--;
+	tx_data(queue, txhdr, (u8 *)skb->data, octets);
+	tx_complete(queue, skb);
+
+	return 0;
+}
+
+static void free_txpacket(struct b43legacy_pio_txpacket *packet,
+			  int irq_context)
+{
+	struct b43legacy_pioqueue *queue = packet->queue;
+
+	if (packet->skb) {
+		if (irq_context)
+			dev_kfree_skb_irq(packet->skb);
+		else
+			dev_kfree_skb(packet->skb);
+	}
+	list_move(&packet->list, &queue->txfree);
+	queue->nr_txfree++;
+}
+
+static int pio_tx_packet(struct b43legacy_pio_txpacket *packet)
+{
+	struct b43legacy_pioqueue *queue = packet->queue;
+	struct sk_buff *skb = packet->skb;
+	u16 octets;
+	int err;
+
+	octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3);
+	if (queue->tx_devq_size < octets) {
+		b43legacywarn(queue->dev->wl, "PIO queue too small. "
+			"Dropping packet.\n");
+		/* Drop it silently (return success) */
+		free_txpacket(packet, 1);
+		return 0;
+	}
+	B43legacy_WARN_ON(queue->tx_devq_packets >
+			  B43legacy_PIO_MAXTXDEVQPACKETS);
+	B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size);
+	/* Check if there is sufficient free space on the device
+	 * TX queue. If not, return and let the TX tasklet
+	 * retry later.
+	 */
+	if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS)
+		return -EBUSY;
+	if (queue->tx_devq_used + octets > queue->tx_devq_size)
+		return -EBUSY;
+	/* Now poke the device. */
+	err = pio_tx_write_fragment(queue, skb, packet,
+			      sizeof(struct b43legacy_txhdr_fw3));
+	if (unlikely(err == -ENOKEY)) {
+		/* Drop this packet, as we don't have the encryption key
+		 * anymore and must not transmit it unencrypted. */
+		free_txpacket(packet, 1);
+		return 0;
+	}
+
+	/* Account for the packet size.
+	 * (We must not overflow the device TX queue)
+	 */
+	queue->tx_devq_packets++;
+	queue->tx_devq_used += octets;
+
+	/* Transmission started, everything ok, move the
+	 * packet to the txrunning list.
+	 */
+	list_move_tail(&packet->list, &queue->txrunning);
+
+	return 0;
+}
+
+static void tx_tasklet(struct tasklet_struct *t)
+{
+	struct b43legacy_pioqueue *queue = from_tasklet(queue, t, txtask);
+	struct b43legacy_wldev *dev = queue->dev;
+	unsigned long flags;
+	struct b43legacy_pio_txpacket *packet, *tmp_packet;
+	int err;
+	u16 txctl;
+
+	spin_lock_irqsave(&dev->wl->irq_lock, flags);
+	if (queue->tx_frozen)
+		goto out_unlock;
+	txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL);
+	if (txctl & B43legacy_PIO_TXCTL_SUSPEND)
+		goto out_unlock;
+
+	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
+		/* Try to transmit the packet. This can fail, if
+		 * the device queue is full. In case of failure, the
+		 * packet is left in the txqueue.
+		 * If transmission succeed, the packet is moved to txrunning.
+		 * If it is impossible to transmit the packet, it
+		 * is dropped.
+		 */
+		err = pio_tx_packet(packet);
+		if (err)
+			break;
+	}
+out_unlock:
+	spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
+}
+
+static void setup_txqueues(struct b43legacy_pioqueue *queue)
+{
+	struct b43legacy_pio_txpacket *packet;
+	int i;
+
+	queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS;
+	for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) {
+		packet = &(queue->tx_packets_cache[i]);
+
+		packet->queue = queue;
+		INIT_LIST_HEAD(&packet->list);
+
+		list_add(&packet->list, &queue->txfree);
+	}
+}
+
+static
+struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,
+						    u16 pio_mmio_base)
+{
+	struct b43legacy_pioqueue *queue;
+	u32 value;
+	u16 qsize;
+
+	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
+	if (!queue)
+		goto out;
+
+	queue->dev = dev;
+	queue->mmio_base = pio_mmio_base;
+	queue->need_workarounds = (dev->dev->id.revision < 3);
+
+	INIT_LIST_HEAD(&queue->txfree);
+	INIT_LIST_HEAD(&queue->txqueue);
+	INIT_LIST_HEAD(&queue->txrunning);
+	tasklet_setup(&queue->txtask, tx_tasklet);
+
+	value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
+	value &= ~B43legacy_MACCTL_BE;
+	b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value);
+
+	qsize = b43legacy_read16(dev, queue->mmio_base
+				 + B43legacy_PIO_TXQBUFSIZE);
+	if (qsize == 0) {
+		b43legacyerr(dev->wl, "This card does not support PIO "
+		       "operation mode. Please use DMA mode "
+		       "(module parameter pio=0).\n");
+		goto err_freequeue;
+	}
+	if (qsize <= B43legacy_PIO_TXQADJUST) {
+		b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",
+		       qsize);
+		goto err_freequeue;
+	}
+	qsize -= B43legacy_PIO_TXQADJUST;
+	queue->tx_devq_size = qsize;
+
+	setup_txqueues(queue);
+
+out:
+	return queue;
+
+err_freequeue:
+	kfree(queue);
+	queue = NULL;
+	goto out;
+}
+
+static void cancel_transfers(struct b43legacy_pioqueue *queue)
+{
+	struct b43legacy_pio_txpacket *packet, *tmp_packet;
+
+	tasklet_kill(&queue->txtask);
+
+	list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
+		free_txpacket(packet, 0);
+	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
+		free_txpacket(packet, 0);
+}
+
+static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue)
+{
+	if (!queue)
+		return;
+
+	cancel_transfers(queue);
+	kfree(queue);
+}
+
+void b43legacy_pio_free(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_pio *pio;
+
+	if (!b43legacy_using_pio(dev))
+		return;
+	pio = &dev->pio;
+
+	b43legacy_destroy_pioqueue(pio->queue3);
+	pio->queue3 = NULL;
+	b43legacy_destroy_pioqueue(pio->queue2);
+	pio->queue2 = NULL;
+	b43legacy_destroy_pioqueue(pio->queue1);
+	pio->queue1 = NULL;
+	b43legacy_destroy_pioqueue(pio->queue0);
+	pio->queue0 = NULL;
+}
+
+int b43legacy_pio_init(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_pio *pio = &dev->pio;
+	struct b43legacy_pioqueue *queue;
+	int err = -ENOMEM;
+
+	queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);
+	if (!queue)
+		goto out;
+	pio->queue0 = queue;
+
+	queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);
+	if (!queue)
+		goto err_destroy0;
+	pio->queue1 = queue;
+
+	queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);
+	if (!queue)
+		goto err_destroy1;
+	pio->queue2 = queue;
+
+	queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);
+	if (!queue)
+		goto err_destroy2;
+	pio->queue3 = queue;
+
+	if (dev->dev->id.revision < 3)
+		dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND;
+
+	b43legacydbg(dev->wl, "PIO initialized\n");
+	err = 0;
+out:
+	return err;
+
+err_destroy2:
+	b43legacy_destroy_pioqueue(pio->queue2);
+	pio->queue2 = NULL;
+err_destroy1:
+	b43legacy_destroy_pioqueue(pio->queue1);
+	pio->queue1 = NULL;
+err_destroy0:
+	b43legacy_destroy_pioqueue(pio->queue0);
+	pio->queue0 = NULL;
+	goto out;
+}
+
+int b43legacy_pio_tx(struct b43legacy_wldev *dev,
+		     struct sk_buff *skb)
+{
+	struct b43legacy_pioqueue *queue = dev->pio.queue1;
+	struct b43legacy_pio_txpacket *packet;
+
+	B43legacy_WARN_ON(queue->tx_suspended);
+	B43legacy_WARN_ON(list_empty(&queue->txfree));
+
+	packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,
+			    list);
+	packet->skb = skb;
+
+	list_move_tail(&packet->list, &queue->txqueue);
+	queue->nr_txfree--;
+	B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);
+
+	tasklet_schedule(&queue->txtask);
+
+	return 0;
+}
+
+void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
+				   const struct b43legacy_txstatus *status)
+{
+	struct b43legacy_pioqueue *queue;
+	struct b43legacy_pio_txpacket *packet;
+	struct ieee80211_tx_info *info;
+	int retry_limit;
+
+	queue = parse_cookie(dev, status->cookie, &packet);
+	B43legacy_WARN_ON(!queue);
+
+	if (!packet->skb)
+		return;
+
+	queue->tx_devq_packets--;
+	queue->tx_devq_used -= (packet->skb->len +
+				sizeof(struct b43legacy_txhdr_fw3));
+
+	info = IEEE80211_SKB_CB(packet->skb);
+
+	/* preserve the confiured retry limit before clearing the status
+	 * The xmit function has overwritten the rc's value with the actual
+	 * retry limit done by the hardware */
+	retry_limit = info->status.rates[0].count;
+	ieee80211_tx_info_clear_status(info);
+
+	if (status->acked)
+		info->flags |= IEEE80211_TX_STAT_ACK;
+
+	if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
+		/*
+		 * If the short retries (RTS, not data frame) have exceeded
+		 * the limit, the hw will not have tried the selected rate,
+		 * but will have used the fallback rate instead.
+		 * Don't let the rate control count attempts for the selected
+		 * rate in this case, otherwise the statistics will be off.
+		 */
+		info->status.rates[0].count = 0;
+		info->status.rates[1].count = status->frame_count;
+	} else {
+		if (status->frame_count > retry_limit) {
+			info->status.rates[0].count = retry_limit;
+			info->status.rates[1].count = status->frame_count -
+					retry_limit;
+
+		} else {
+			info->status.rates[0].count = status->frame_count;
+			info->status.rates[1].idx = -1;
+		}
+	}
+	ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb);
+	packet->skb = NULL;
+
+	free_txpacket(packet, 1);
+	/* If there are packets on the txqueue, poke the tasklet
+	 * to transmit them.
+	 */
+	if (!list_empty(&queue->txqueue))
+		tasklet_schedule(&queue->txtask);
+}
+
+static void pio_rx_error(struct b43legacy_pioqueue *queue,
+			 int clear_buffers,
+			 const char *error)
+{
+	int i;
+
+	b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);
+	b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
+			    B43legacy_PIO_RXCTL_READY);
+	if (clear_buffers) {
+		B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);
+		for (i = 0; i < 15; i++) {
+			/* Dummy read. */
+			b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
+		}
+	}
+}
+
+void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
+{
+	__le16 preamble[21] = { 0 };
+	struct b43legacy_rxhdr_fw3 *rxhdr;
+	u16 tmp;
+	u16 len;
+	u16 macstat;
+	int i;
+	int preamble_readwords;
+	struct sk_buff *skb;
+
+	tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
+	if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))
+		return;
+	b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
+			    B43legacy_PIO_RXCTL_DATAAVAILABLE);
+
+	for (i = 0; i < 10; i++) {
+		tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
+		if (tmp & B43legacy_PIO_RXCTL_READY)
+			goto data_ready;
+		udelay(10);
+	}
+	b43legacydbg(queue->dev->wl, "PIO RX timed out\n");
+	return;
+data_ready:
+
+	len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
+	if (unlikely(len > 0x700)) {
+		pio_rx_error(queue, 0, "len > 0x700");
+		return;
+	}
+	if (unlikely(len == 0 && queue->mmio_base !=
+		     B43legacy_MMIO_PIO4_BASE)) {
+		pio_rx_error(queue, 0, "len == 0");
+		return;
+	}
+	preamble[0] = cpu_to_le16(len);
+	if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)
+		preamble_readwords = 14 / sizeof(u16);
+	else
+		preamble_readwords = 18 / sizeof(u16);
+	for (i = 0; i < preamble_readwords; i++) {
+		tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
+		preamble[i + 1] = cpu_to_le16(tmp);
+	}
+	rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;
+	macstat = le16_to_cpu(rxhdr->mac_status);
+	if (macstat & B43legacy_RX_MAC_FCSERR) {
+		pio_rx_error(queue,
+			     (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),
+			     "Frame FCS error");
+		return;
+	}
+	if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {
+		/* We received an xmit status. */
+		struct b43legacy_hwtxstatus *hw;
+
+		hw = (struct b43legacy_hwtxstatus *)(preamble + 1);
+		b43legacy_handle_hwtxstatus(queue->dev, hw);
+
+		return;
+	}
+
+	skb = dev_alloc_skb(len);
+	if (unlikely(!skb)) {
+		pio_rx_error(queue, 1, "OOM");
+		return;
+	}
+	skb_put(skb, len);
+	for (i = 0; i < len - 1; i += 2) {
+		tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
+		*((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);
+	}
+	if (len % 2) {
+		tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
+		skb->data[len - 1] = (tmp & 0x00FF);
+	}
+	b43legacy_rx(queue->dev, skb, rxhdr);
+}
+
+void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
+{
+	b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);
+	b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
+			    b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
+			    | B43legacy_PIO_TXCTL_SUSPEND);
+}
+
+void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
+{
+	b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
+			    b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
+			    & ~B43legacy_PIO_TXCTL_SUSPEND);
+	b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);
+	tasklet_schedule(&queue->txtask);
+}
+
+void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_pio *pio;
+
+	B43legacy_WARN_ON(!b43legacy_using_pio(dev));
+	pio = &dev->pio;
+	pio->queue0->tx_frozen = 1;
+	pio->queue1->tx_frozen = 1;
+	pio->queue2->tx_frozen = 1;
+	pio->queue3->tx_frozen = 1;
+}
+
+void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_pio *pio;
+
+	B43legacy_WARN_ON(!b43legacy_using_pio(dev));
+	pio = &dev->pio;
+	pio->queue0->tx_frozen = 0;
+	pio->queue1->tx_frozen = 0;
+	pio->queue2->tx_frozen = 0;
+	pio->queue3->tx_frozen = 0;
+	if (!list_empty(&pio->queue0->txqueue))
+		tasklet_schedule(&pio->queue0->txtask);
+	if (!list_empty(&pio->queue1->txqueue))
+		tasklet_schedule(&pio->queue1->txtask);
+	if (!list_empty(&pio->queue2->txqueue))
+		tasklet_schedule(&pio->queue2->txtask);
+	if (!list_empty(&pio->queue3->txqueue))
+		tasklet_schedule(&pio->queue3->txtask);
+}