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, 735 insertions, 0 deletions

diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c
new file mode 100644
index 000000000..6ac5ff20a
--- /dev/null
+++ b/drivers/firewire/core-card.c
@@ -0,0 +1,735 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
+ */
+
+#include <linux/bug.h>
+#include <linux/completion.h>
+#include <linux/crc-itu-t.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+
+#include <linux/atomic.h>
+#include <asm/byteorder.h>
+
+#include "core.h"
+
+#define define_fw_printk_level(func, kern_level)		\
+void func(const struct fw_card *card, const char *fmt, ...)	\
+{								\
+	struct va_format vaf;					\
+	va_list args;						\
+								\
+	va_start(args, fmt);					\
+	vaf.fmt = fmt;						\
+	vaf.va = &args;						\
+	printk(kern_level KBUILD_MODNAME " %s: %pV",		\
+	       dev_name(card->device), &vaf);			\
+	va_end(args);						\
+}
+define_fw_printk_level(fw_err, KERN_ERR);
+define_fw_printk_level(fw_notice, KERN_NOTICE);
+
+int fw_compute_block_crc(__be32 *block)
+{
+	int length;
+	u16 crc;
+
+	length = (be32_to_cpu(block[0]) >> 16) & 0xff;
+	crc = crc_itu_t(0, (u8 *)&block[1], length * 4);
+	*block |= cpu_to_be32(crc);
+
+	return length;
+}
+
+static DEFINE_MUTEX(card_mutex);
+static LIST_HEAD(card_list);
+
+static LIST_HEAD(descriptor_list);
+static int descriptor_count;
+
+static __be32 tmp_config_rom[256];
+/* ROM header, bus info block, root dir header, capabilities = 7 quadlets */
+static size_t config_rom_length = 1 + 4 + 1 + 1;
+
+#define BIB_CRC(v)		((v) <<  0)
+#define BIB_CRC_LENGTH(v)	((v) << 16)
+#define BIB_INFO_LENGTH(v)	((v) << 24)
+#define BIB_BUS_NAME		0x31333934 /* "1394" */
+#define BIB_LINK_SPEED(v)	((v) <<  0)
+#define BIB_GENERATION(v)	((v) <<  4)
+#define BIB_MAX_ROM(v)		((v) <<  8)
+#define BIB_MAX_RECEIVE(v)	((v) << 12)
+#define BIB_CYC_CLK_ACC(v)	((v) << 16)
+#define BIB_PMC			((1) << 27)
+#define BIB_BMC			((1) << 28)
+#define BIB_ISC			((1) << 29)
+#define BIB_CMC			((1) << 30)
+#define BIB_IRMC		((1) << 31)
+#define NODE_CAPABILITIES	0x0c0083c0 /* per IEEE 1394 clause 8.3.2.6.5.2 */
+
+/*
+ * IEEE-1394 specifies a default SPLIT_TIMEOUT value of 800 cycles (100 ms),
+ * but we have to make it longer because there are many devices whose firmware
+ * is just too slow for that.
+ */
+#define DEFAULT_SPLIT_TIMEOUT	(2 * 8000)
+
+#define CANON_OUI		0x000085
+
+static void generate_config_rom(struct fw_card *card, __be32 *config_rom)
+{
+	struct fw_descriptor *desc;
+	int i, j, k, length;
+
+	/*
+	 * Initialize contents of config rom buffer.  On the OHCI
+	 * controller, block reads to the config rom accesses the host
+	 * memory, but quadlet read access the hardware bus info block
+	 * registers.  That's just crack, but it means we should make
+	 * sure the contents of bus info block in host memory matches
+	 * the version stored in the OHCI registers.
+	 */
+
+	config_rom[0] = cpu_to_be32(
+		BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0));
+	config_rom[1] = cpu_to_be32(BIB_BUS_NAME);
+	config_rom[2] = cpu_to_be32(
+		BIB_LINK_SPEED(card->link_speed) |
+		BIB_GENERATION(card->config_rom_generation++ % 14 + 2) |
+		BIB_MAX_ROM(2) |
+		BIB_MAX_RECEIVE(card->max_receive) |
+		BIB_BMC | BIB_ISC | BIB_CMC | BIB_IRMC);
+	config_rom[3] = cpu_to_be32(card->guid >> 32);
+	config_rom[4] = cpu_to_be32(card->guid);
+
+	/* Generate root directory. */
+	config_rom[6] = cpu_to_be32(NODE_CAPABILITIES);
+	i = 7;
+	j = 7 + descriptor_count;
+
+	/* Generate root directory entries for descriptors. */
+	list_for_each_entry (desc, &descriptor_list, link) {
+		if (desc->immediate > 0)
+			config_rom[i++] = cpu_to_be32(desc->immediate);
+		config_rom[i] = cpu_to_be32(desc->key | (j - i));
+		i++;
+		j += desc->length;
+	}
+
+	/* Update root directory length. */
+	config_rom[5] = cpu_to_be32((i - 5 - 1) << 16);
+
+	/* End of root directory, now copy in descriptors. */
+	list_for_each_entry (desc, &descriptor_list, link) {
+		for (k = 0; k < desc->length; k++)
+			config_rom[i + k] = cpu_to_be32(desc->data[k]);
+		i += desc->length;
+	}
+
+	/* Calculate CRCs for all blocks in the config rom.  This
+	 * assumes that CRC length and info length are identical for
+	 * the bus info block, which is always the case for this
+	 * implementation. */
+	for (i = 0; i < j; i += length + 1)
+		length = fw_compute_block_crc(config_rom + i);
+
+	WARN_ON(j != config_rom_length);
+}
+
+static void update_config_roms(void)
+{
+	struct fw_card *card;
+
+	list_for_each_entry (card, &card_list, link) {
+		generate_config_rom(card, tmp_config_rom);
+		card->driver->set_config_rom(card, tmp_config_rom,
+					     config_rom_length);
+	}
+}
+
+static size_t required_space(struct fw_descriptor *desc)
+{
+	/* descriptor + entry into root dir + optional immediate entry */
+	return desc->length + 1 + (desc->immediate > 0 ? 1 : 0);
+}
+
+int fw_core_add_descriptor(struct fw_descriptor *desc)
+{
+	size_t i;
+	int ret;
+
+	/*
+	 * Check descriptor is valid; the length of all blocks in the
+	 * descriptor has to add up to exactly the length of the
+	 * block.
+	 */
+	i = 0;
+	while (i < desc->length)
+		i += (desc->data[i] >> 16) + 1;
+
+	if (i != desc->length)
+		return -EINVAL;
+
+	mutex_lock(&card_mutex);
+
+	if (config_rom_length + required_space(desc) > 256) {
+		ret = -EBUSY;
+	} else {
+		list_add_tail(&desc->link, &descriptor_list);
+		config_rom_length += required_space(desc);
+		descriptor_count++;
+		if (desc->immediate > 0)
+			descriptor_count++;
+		update_config_roms();
+		ret = 0;
+	}
+
+	mutex_unlock(&card_mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL(fw_core_add_descriptor);
+
+void fw_core_remove_descriptor(struct fw_descriptor *desc)
+{
+	mutex_lock(&card_mutex);
+
+	list_del(&desc->link);
+	config_rom_length -= required_space(desc);
+	descriptor_count--;
+	if (desc->immediate > 0)
+		descriptor_count--;
+	update_config_roms();
+
+	mutex_unlock(&card_mutex);
+}
+EXPORT_SYMBOL(fw_core_remove_descriptor);
+
+static int reset_bus(struct fw_card *card, bool short_reset)
+{
+	int reg = short_reset ? 5 : 1;
+	int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET;
+
+	return card->driver->update_phy_reg(card, reg, 0, bit);
+}
+
+void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset)
+{
+	/* We don't try hard to sort out requests of long vs. short resets. */
+	card->br_short = short_reset;
+
+	/* Use an arbitrary short delay to combine multiple reset requests. */
+	fw_card_get(card);
+	if (!queue_delayed_work(fw_workqueue, &card->br_work,
+				delayed ? DIV_ROUND_UP(HZ, 100) : 0))
+		fw_card_put(card);
+}
+EXPORT_SYMBOL(fw_schedule_bus_reset);
+
+static void br_work(struct work_struct *work)
+{
+	struct fw_card *card = container_of(work, struct fw_card, br_work.work);
+
+	/* Delay for 2s after last reset per IEEE 1394 clause 8.2.1. */
+	if (card->reset_jiffies != 0 &&
+	    time_before64(get_jiffies_64(), card->reset_jiffies + 2 * HZ)) {
+		if (!queue_delayed_work(fw_workqueue, &card->br_work, 2 * HZ))
+			fw_card_put(card);
+		return;
+	}
+
+	fw_send_phy_config(card, FW_PHY_CONFIG_NO_NODE_ID, card->generation,
+			   FW_PHY_CONFIG_CURRENT_GAP_COUNT);
+	reset_bus(card, card->br_short);
+	fw_card_put(card);
+}
+
+static void allocate_broadcast_channel(struct fw_card *card, int generation)
+{
+	int channel, bandwidth = 0;
+
+	if (!card->broadcast_channel_allocated) {
+		fw_iso_resource_manage(card, generation, 1ULL << 31,
+				       &channel, &bandwidth, true);
+		if (channel != 31) {
+			fw_notice(card, "failed to allocate broadcast channel\n");
+			return;
+		}
+		card->broadcast_channel_allocated = true;
+	}
+
+	device_for_each_child(card->device, (void *)(long)generation,
+			      fw_device_set_broadcast_channel);
+}
+
+static const char gap_count_table[] = {
+	63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
+};
+
+void fw_schedule_bm_work(struct fw_card *card, unsigned long delay)
+{
+	fw_card_get(card);
+	if (!schedule_delayed_work(&card->bm_work, delay))
+		fw_card_put(card);
+}
+
+static void bm_work(struct work_struct *work)
+{
+	struct fw_card *card = container_of(work, struct fw_card, bm_work.work);
+	struct fw_device *root_device, *irm_device;
+	struct fw_node *root_node;
+	int root_id, new_root_id, irm_id, bm_id, local_id;
+	int gap_count, generation, grace, rcode;
+	bool do_reset = false;
+	bool root_device_is_running;
+	bool root_device_is_cmc;
+	bool irm_is_1394_1995_only;
+	bool keep_this_irm;
+	__be32 transaction_data[2];
+
+	spin_lock_irq(&card->lock);
+
+	if (card->local_node == NULL) {
+		spin_unlock_irq(&card->lock);
+		goto out_put_card;
+	}
+
+	generation = card->generation;
+
+	root_node = card->root_node;
+	fw_node_get(root_node);
+	root_device = root_node->data;
+	root_device_is_running = root_device &&
+			atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
+	root_device_is_cmc = root_device && root_device->cmc;
+
+	irm_device = card->irm_node->data;
+	irm_is_1394_1995_only = irm_device && irm_device->config_rom &&
+			(irm_device->config_rom[2] & 0x000000f0) == 0;
+
+	/* Canon MV5i works unreliably if it is not root node. */
+	keep_this_irm = irm_device && irm_device->config_rom &&
+			irm_device->config_rom[3] >> 8 == CANON_OUI;
+
+	root_id  = root_node->node_id;
+	irm_id   = card->irm_node->node_id;
+	local_id = card->local_node->node_id;
+
+	grace = time_after64(get_jiffies_64(),
+			     card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
+
+	if ((is_next_generation(generation, card->bm_generation) &&
+	     !card->bm_abdicate) ||
+	    (card->bm_generation != generation && grace)) {
+		/*
+		 * This first step is to figure out who is IRM and
+		 * then try to become bus manager.  If the IRM is not
+		 * well defined (e.g. does not have an active link
+		 * layer or does not responds to our lock request, we
+		 * will have to do a little vigilante bus management.
+		 * In that case, we do a goto into the gap count logic
+		 * so that when we do the reset, we still optimize the
+		 * gap count.  That could well save a reset in the
+		 * next generation.
+		 */
+
+		if (!card->irm_node->link_on) {
+			new_root_id = local_id;
+			fw_notice(card, "%s, making local node (%02x) root\n",
+				  "IRM has link off", new_root_id);
+			goto pick_me;
+		}
+
+		if (irm_is_1394_1995_only && !keep_this_irm) {
+			new_root_id = local_id;
+			fw_notice(card, "%s, making local node (%02x) root\n",
+				  "IRM is not 1394a compliant", new_root_id);
+			goto pick_me;
+		}
+
+		transaction_data[0] = cpu_to_be32(0x3f);
+		transaction_data[1] = cpu_to_be32(local_id);
+
+		spin_unlock_irq(&card->lock);
+
+		rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
+				irm_id, generation, SCODE_100,
+				CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
+				transaction_data, 8);
+
+		if (rcode == RCODE_GENERATION)
+			/* Another bus reset, BM work has been rescheduled. */
+			goto out;
+
+		bm_id = be32_to_cpu(transaction_data[0]);
+
+		spin_lock_irq(&card->lock);
+		if (rcode == RCODE_COMPLETE && generation == card->generation)
+			card->bm_node_id =
+			    bm_id == 0x3f ? local_id : 0xffc0 | bm_id;
+		spin_unlock_irq(&card->lock);
+
+		if (rcode == RCODE_COMPLETE && bm_id != 0x3f) {
+			/* Somebody else is BM.  Only act as IRM. */
+			if (local_id == irm_id)
+				allocate_broadcast_channel(card, generation);
+
+			goto out;
+		}
+
+		if (rcode == RCODE_SEND_ERROR) {
+			/*
+			 * We have been unable to send the lock request due to
+			 * some local problem.  Let's try again later and hope
+			 * that the problem has gone away by then.
+			 */
+			fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
+			goto out;
+		}
+
+		spin_lock_irq(&card->lock);
+
+		if (rcode != RCODE_COMPLETE && !keep_this_irm) {
+			/*
+			 * The lock request failed, maybe the IRM
+			 * isn't really IRM capable after all. Let's
+			 * do a bus reset and pick the local node as
+			 * root, and thus, IRM.
+			 */
+			new_root_id = local_id;
+			fw_notice(card, "BM lock failed (%s), making local node (%02x) root\n",
+				  fw_rcode_string(rcode), new_root_id);
+			goto pick_me;
+		}
+	} else if (card->bm_generation != generation) {
+		/*
+		 * We weren't BM in the last generation, and the last
+		 * bus reset is less than 125ms ago.  Reschedule this job.
+		 */
+		spin_unlock_irq(&card->lock);
+		fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
+		goto out;
+	}
+
+	/*
+	 * We're bus manager for this generation, so next step is to
+	 * make sure we have an active cycle master and do gap count
+	 * optimization.
+	 */
+	card->bm_generation = generation;
+
+	if (root_device == NULL) {
+		/*
+		 * Either link_on is false, or we failed to read the
+		 * config rom.  In either case, pick another root.
+		 */
+		new_root_id = local_id;
+	} else if (!root_device_is_running) {
+		/*
+		 * If we haven't probed this device yet, bail out now
+		 * and let's try again once that's done.
+		 */
+		spin_unlock_irq(&card->lock);
+		goto out;
+	} else if (root_device_is_cmc) {
+		/*
+		 * We will send out a force root packet for this
+		 * node as part of the gap count optimization.
+		 */
+		new_root_id = root_id;
+	} else {
+		/*
+		 * Current root has an active link layer and we
+		 * successfully read the config rom, but it's not
+		 * cycle master capable.
+		 */
+		new_root_id = local_id;
+	}
+
+ pick_me:
+	/*
+	 * Pick a gap count from 1394a table E-1.  The table doesn't cover
+	 * the typically much larger 1394b beta repeater delays though.
+	 */
+	if (!card->beta_repeaters_present &&
+	    root_node->max_hops < ARRAY_SIZE(gap_count_table))
+		gap_count = gap_count_table[root_node->max_hops];
+	else
+		gap_count = 63;
+
+	/*
+	 * Finally, figure out if we should do a reset or not.  If we have
+	 * done less than 5 resets with the same physical topology and we
+	 * have either a new root or a new gap count setting, let's do it.
+	 */
+
+	if (card->bm_retries++ < 5 &&
+	    (card->gap_count != gap_count || new_root_id != root_id))
+		do_reset = true;
+
+	spin_unlock_irq(&card->lock);
+
+	if (do_reset) {
+		fw_notice(card, "phy config: new root=%x, gap_count=%d\n",
+			  new_root_id, gap_count);
+		fw_send_phy_config(card, new_root_id, generation, gap_count);
+		reset_bus(card, true);
+		/* Will allocate broadcast channel after the reset. */
+		goto out;
+	}
+
+	if (root_device_is_cmc) {
+		/*
+		 * Make sure that the cycle master sends cycle start packets.
+		 */
+		transaction_data[0] = cpu_to_be32(CSR_STATE_BIT_CMSTR);
+		rcode = fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
+				root_id, generation, SCODE_100,
+				CSR_REGISTER_BASE + CSR_STATE_SET,
+				transaction_data, 4);
+		if (rcode == RCODE_GENERATION)
+			goto out;
+	}
+
+	if (local_id == irm_id)
+		allocate_broadcast_channel(card, generation);
+
+ out:
+	fw_node_put(root_node);
+ out_put_card:
+	fw_card_put(card);
+}
+
+void fw_card_initialize(struct fw_card *card,
+			const struct fw_card_driver *driver,
+			struct device *device)
+{
+	static atomic_t index = ATOMIC_INIT(-1);
+
+	card->index = atomic_inc_return(&index);
+	card->driver = driver;
+	card->device = device;
+	card->current_tlabel = 0;
+	card->tlabel_mask = 0;
+	card->split_timeout_hi = DEFAULT_SPLIT_TIMEOUT / 8000;
+	card->split_timeout_lo = (DEFAULT_SPLIT_TIMEOUT % 8000) << 19;
+	card->split_timeout_cycles = DEFAULT_SPLIT_TIMEOUT;
+	card->split_timeout_jiffies =
+			DIV_ROUND_UP(DEFAULT_SPLIT_TIMEOUT * HZ, 8000);
+	card->color = 0;
+	card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
+
+	kref_init(&card->kref);
+	init_completion(&card->done);
+	INIT_LIST_HEAD(&card->transaction_list);
+	INIT_LIST_HEAD(&card->phy_receiver_list);
+	spin_lock_init(&card->lock);
+
+	card->local_node = NULL;
+
+	INIT_DELAYED_WORK(&card->br_work, br_work);
+	INIT_DELAYED_WORK(&card->bm_work, bm_work);
+}
+EXPORT_SYMBOL(fw_card_initialize);
+
+int fw_card_add(struct fw_card *card,
+		u32 max_receive, u32 link_speed, u64 guid)
+{
+	int ret;
+
+	card->max_receive = max_receive;
+	card->link_speed = link_speed;
+	card->guid = guid;
+
+	mutex_lock(&card_mutex);
+
+	generate_config_rom(card, tmp_config_rom);
+	ret = card->driver->enable(card, tmp_config_rom, config_rom_length);
+	if (ret == 0)
+		list_add_tail(&card->link, &card_list);
+
+	mutex_unlock(&card_mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL(fw_card_add);
+
+/*
+ * The next few functions implement a dummy driver that is used once a card
+ * driver shuts down an fw_card.  This allows the driver to cleanly unload,
+ * as all IO to the card will be handled (and failed) by the dummy driver
+ * instead of calling into the module.  Only functions for iso context
+ * shutdown still need to be provided by the card driver.
+ *
+ * .read/write_csr() should never be called anymore after the dummy driver
+ * was bound since they are only used within request handler context.
+ * .set_config_rom() is never called since the card is taken out of card_list
+ * before switching to the dummy driver.
+ */
+
+static int dummy_read_phy_reg(struct fw_card *card, int address)
+{
+	return -ENODEV;
+}
+
+static int dummy_update_phy_reg(struct fw_card *card, int address,
+				int clear_bits, int set_bits)
+{
+	return -ENODEV;
+}
+
+static void dummy_send_request(struct fw_card *card, struct fw_packet *packet)
+{
+	packet->callback(packet, card, RCODE_CANCELLED);
+}
+
+static void dummy_send_response(struct fw_card *card, struct fw_packet *packet)
+{
+	packet->callback(packet, card, RCODE_CANCELLED);
+}
+
+static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
+{
+	return -ENOENT;
+}
+
+static int dummy_enable_phys_dma(struct fw_card *card,
+				 int node_id, int generation)
+{
+	return -ENODEV;
+}
+
+static struct fw_iso_context *dummy_allocate_iso_context(struct fw_card *card,
+				int type, int channel, size_t header_size)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static u32 dummy_read_csr(struct fw_card *card, int csr_offset)
+{
+	return 0;
+}
+
+static void dummy_write_csr(struct fw_card *card, int csr_offset, u32 value)
+{
+}
+
+static int dummy_start_iso(struct fw_iso_context *ctx,
+			   s32 cycle, u32 sync, u32 tags)
+{
+	return -ENODEV;
+}
+
+static int dummy_set_iso_channels(struct fw_iso_context *ctx, u64 *channels)
+{
+	return -ENODEV;
+}
+
+static int dummy_queue_iso(struct fw_iso_context *ctx, struct fw_iso_packet *p,
+			   struct fw_iso_buffer *buffer, unsigned long payload)
+{
+	return -ENODEV;
+}
+
+static void dummy_flush_queue_iso(struct fw_iso_context *ctx)
+{
+}
+
+static int dummy_flush_iso_completions(struct fw_iso_context *ctx)
+{
+	return -ENODEV;
+}
+
+static const struct fw_card_driver dummy_driver_template = {
+	.read_phy_reg		= dummy_read_phy_reg,
+	.update_phy_reg		= dummy_update_phy_reg,
+	.send_request		= dummy_send_request,
+	.send_response		= dummy_send_response,
+	.cancel_packet		= dummy_cancel_packet,
+	.enable_phys_dma	= dummy_enable_phys_dma,
+	.read_csr		= dummy_read_csr,
+	.write_csr		= dummy_write_csr,
+	.allocate_iso_context	= dummy_allocate_iso_context,
+	.start_iso		= dummy_start_iso,
+	.set_iso_channels	= dummy_set_iso_channels,
+	.queue_iso		= dummy_queue_iso,
+	.flush_queue_iso	= dummy_flush_queue_iso,
+	.flush_iso_completions	= dummy_flush_iso_completions,
+};
+
+void fw_card_release(struct kref *kref)
+{
+	struct fw_card *card = container_of(kref, struct fw_card, kref);
+
+	complete(&card->done);
+}
+EXPORT_SYMBOL_GPL(fw_card_release);
+
+void fw_core_remove_card(struct fw_card *card)
+{
+	struct fw_card_driver dummy_driver = dummy_driver_template;
+	unsigned long flags;
+
+	card->driver->update_phy_reg(card, 4,
+				     PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
+	fw_schedule_bus_reset(card, false, true);
+
+	mutex_lock(&card_mutex);
+	list_del_init(&card->link);
+	mutex_unlock(&card_mutex);
+
+	/* Switch off most of the card driver interface. */
+	dummy_driver.free_iso_context	= card->driver->free_iso_context;
+	dummy_driver.stop_iso		= card->driver->stop_iso;
+	card->driver = &dummy_driver;
+
+	spin_lock_irqsave(&card->lock, flags);
+	fw_destroy_nodes(card);
+	spin_unlock_irqrestore(&card->lock, flags);
+
+	/* Wait for all users, especially device workqueue jobs, to finish. */
+	fw_card_put(card);
+	wait_for_completion(&card->done);
+
+	WARN_ON(!list_empty(&card->transaction_list));
+}
+EXPORT_SYMBOL(fw_core_remove_card);
+
+/**
+ * fw_card_read_cycle_time: read from Isochronous Cycle Timer Register of 1394 OHCI in MMIO region
+ *			    for controller card.
+ * @card: The instance of card for 1394 OHCI controller.
+ * @cycle_time: The mutual reference to value of cycle time for the read operation.
+ *
+ * Read value from Isochronous Cycle Timer Register of 1394 OHCI in MMIO region for the given
+ * controller card. This function accesses the region without any lock primitives or IRQ mask.
+ * When returning successfully, the content of @value argument has value aligned to host endianness,
+ * formetted by CYCLE_TIME CSR Register of IEEE 1394 std.
+ *
+ * Context: Any context.
+ * Return:
+ * * 0 - Read successfully.
+ * * -ENODEV - The controller is unavailable due to being removed or unbound.
+ */
+int fw_card_read_cycle_time(struct fw_card *card, u32 *cycle_time)
+{
+	if (card->driver->read_csr == dummy_read_csr)
+		return -ENODEV;
+
+	// It's possible to switch to dummy driver between the above and the below. This is the best
+	// effort to return -ENODEV.
+	*cycle_time = card->driver->read_csr(card, CSR_CYCLE_TIME);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fw_card_read_cycle_time);