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, 725 insertions, 0 deletions

diff --git a/fs/afs/server.c b/fs/afs/server.c
new file mode 100644
index 000000000..b5237206e
--- /dev/null
+++ b/fs/afs/server.c
@@ -0,0 +1,725 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* AFS server record management
+ *
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include "afs_fs.h"
+#include "internal.h"
+#include "protocol_yfs.h"
+
+static unsigned afs_server_gc_delay = 10;	/* Server record timeout in seconds */
+static atomic_t afs_server_debug_id;
+
+static struct afs_server *afs_maybe_use_server(struct afs_server *,
+					       enum afs_server_trace);
+static void __afs_put_server(struct afs_net *, struct afs_server *);
+
+/*
+ * Find a server by one of its addresses.
+ */
+struct afs_server *afs_find_server(struct afs_net *net,
+				   const struct sockaddr_rxrpc *srx)
+{
+	const struct afs_addr_list *alist;
+	struct afs_server *server = NULL;
+	unsigned int i;
+	int seq = 0, diff;
+
+	rcu_read_lock();
+
+	do {
+		if (server)
+			afs_unuse_server_notime(net, server, afs_server_trace_put_find_rsq);
+		server = NULL;
+		read_seqbegin_or_lock(&net->fs_addr_lock, &seq);
+
+		if (srx->transport.family == AF_INET6) {
+			const struct sockaddr_in6 *a = &srx->transport.sin6, *b;
+			hlist_for_each_entry_rcu(server, &net->fs_addresses6, addr6_link) {
+				alist = rcu_dereference(server->addresses);
+				for (i = alist->nr_ipv4; i < alist->nr_addrs; i++) {
+					b = &alist->addrs[i].transport.sin6;
+					diff = ((u16 __force)a->sin6_port -
+						(u16 __force)b->sin6_port);
+					if (diff == 0)
+						diff = memcmp(&a->sin6_addr,
+							      &b->sin6_addr,
+							      sizeof(struct in6_addr));
+					if (diff == 0)
+						goto found;
+				}
+			}
+		} else {
+			const struct sockaddr_in *a = &srx->transport.sin, *b;
+			hlist_for_each_entry_rcu(server, &net->fs_addresses4, addr4_link) {
+				alist = rcu_dereference(server->addresses);
+				for (i = 0; i < alist->nr_ipv4; i++) {
+					b = &alist->addrs[i].transport.sin;
+					diff = ((u16 __force)a->sin_port -
+						(u16 __force)b->sin_port);
+					if (diff == 0)
+						diff = ((u32 __force)a->sin_addr.s_addr -
+							(u32 __force)b->sin_addr.s_addr);
+					if (diff == 0)
+						goto found;
+				}
+			}
+		}
+
+		server = NULL;
+		continue;
+	found:
+		server = afs_maybe_use_server(server, afs_server_trace_get_by_addr);
+
+	} while (need_seqretry(&net->fs_addr_lock, seq));
+
+	done_seqretry(&net->fs_addr_lock, seq);
+
+	rcu_read_unlock();
+	return server;
+}
+
+/*
+ * Look up a server by its UUID and mark it active.
+ */
+struct afs_server *afs_find_server_by_uuid(struct afs_net *net, const uuid_t *uuid)
+{
+	struct afs_server *server = NULL;
+	struct rb_node *p;
+	int diff, seq = 0;
+
+	_enter("%pU", uuid);
+
+	do {
+		/* Unfortunately, rbtree walking doesn't give reliable results
+		 * under just the RCU read lock, so we have to check for
+		 * changes.
+		 */
+		if (server)
+			afs_unuse_server(net, server, afs_server_trace_put_uuid_rsq);
+		server = NULL;
+
+		read_seqbegin_or_lock(&net->fs_lock, &seq);
+
+		p = net->fs_servers.rb_node;
+		while (p) {
+			server = rb_entry(p, struct afs_server, uuid_rb);
+
+			diff = memcmp(uuid, &server->uuid, sizeof(*uuid));
+			if (diff < 0) {
+				p = p->rb_left;
+			} else if (diff > 0) {
+				p = p->rb_right;
+			} else {
+				afs_use_server(server, afs_server_trace_get_by_uuid);
+				break;
+			}
+
+			server = NULL;
+		}
+	} while (need_seqretry(&net->fs_lock, seq));
+
+	done_seqretry(&net->fs_lock, seq);
+
+	_leave(" = %p", server);
+	return server;
+}
+
+/*
+ * Install a server record in the namespace tree.  If there's a clash, we stick
+ * it into a list anchored on whichever afs_server struct is actually in the
+ * tree.
+ */
+static struct afs_server *afs_install_server(struct afs_cell *cell,
+					     struct afs_server *candidate)
+{
+	const struct afs_addr_list *alist;
+	struct afs_server *server, *next;
+	struct afs_net *net = cell->net;
+	struct rb_node **pp, *p;
+	int diff;
+
+	_enter("%p", candidate);
+
+	write_seqlock(&net->fs_lock);
+
+	/* Firstly install the server in the UUID lookup tree */
+	pp = &net->fs_servers.rb_node;
+	p = NULL;
+	while (*pp) {
+		p = *pp;
+		_debug("- consider %p", p);
+		server = rb_entry(p, struct afs_server, uuid_rb);
+		diff = memcmp(&candidate->uuid, &server->uuid, sizeof(uuid_t));
+		if (diff < 0) {
+			pp = &(*pp)->rb_left;
+		} else if (diff > 0) {
+			pp = &(*pp)->rb_right;
+		} else {
+			if (server->cell == cell)
+				goto exists;
+
+			/* We have the same UUID representing servers in
+			 * different cells.  Append the new server to the list.
+			 */
+			for (;;) {
+				next = rcu_dereference_protected(
+					server->uuid_next,
+					lockdep_is_held(&net->fs_lock.lock));
+				if (!next)
+					break;
+				server = next;
+			}
+			rcu_assign_pointer(server->uuid_next, candidate);
+			candidate->uuid_prev = server;
+			server = candidate;
+			goto added_dup;
+		}
+	}
+
+	server = candidate;
+	rb_link_node(&server->uuid_rb, p, pp);
+	rb_insert_color(&server->uuid_rb, &net->fs_servers);
+	hlist_add_head_rcu(&server->proc_link, &net->fs_proc);
+
+added_dup:
+	write_seqlock(&net->fs_addr_lock);
+	alist = rcu_dereference_protected(server->addresses,
+					  lockdep_is_held(&net->fs_addr_lock.lock));
+
+	/* Secondly, if the server has any IPv4 and/or IPv6 addresses, install
+	 * it in the IPv4 and/or IPv6 reverse-map lists.
+	 *
+	 * TODO: For speed we want to use something other than a flat list
+	 * here; even sorting the list in terms of lowest address would help a
+	 * bit, but anything we might want to do gets messy and memory
+	 * intensive.
+	 */
+	if (alist->nr_ipv4 > 0)
+		hlist_add_head_rcu(&server->addr4_link, &net->fs_addresses4);
+	if (alist->nr_addrs > alist->nr_ipv4)
+		hlist_add_head_rcu(&server->addr6_link, &net->fs_addresses6);
+
+	write_sequnlock(&net->fs_addr_lock);
+
+exists:
+	afs_get_server(server, afs_server_trace_get_install);
+	write_sequnlock(&net->fs_lock);
+	return server;
+}
+
+/*
+ * Allocate a new server record and mark it active.
+ */
+static struct afs_server *afs_alloc_server(struct afs_cell *cell,
+					   const uuid_t *uuid,
+					   struct afs_addr_list *alist)
+{
+	struct afs_server *server;
+	struct afs_net *net = cell->net;
+
+	_enter("");
+
+	server = kzalloc(sizeof(struct afs_server), GFP_KERNEL);
+	if (!server)
+		goto enomem;
+
+	refcount_set(&server->ref, 1);
+	atomic_set(&server->active, 1);
+	server->debug_id = atomic_inc_return(&afs_server_debug_id);
+	RCU_INIT_POINTER(server->addresses, alist);
+	server->addr_version = alist->version;
+	server->uuid = *uuid;
+	rwlock_init(&server->fs_lock);
+	INIT_WORK(&server->initcb_work, afs_server_init_callback_work);
+	init_waitqueue_head(&server->probe_wq);
+	INIT_LIST_HEAD(&server->probe_link);
+	spin_lock_init(&server->probe_lock);
+	server->cell = cell;
+	server->rtt = UINT_MAX;
+
+	afs_inc_servers_outstanding(net);
+	trace_afs_server(server->debug_id, 1, 1, afs_server_trace_alloc);
+	_leave(" = %p", server);
+	return server;
+
+enomem:
+	_leave(" = NULL [nomem]");
+	return NULL;
+}
+
+/*
+ * Look up an address record for a server
+ */
+static struct afs_addr_list *afs_vl_lookup_addrs(struct afs_cell *cell,
+						 struct key *key, const uuid_t *uuid)
+{
+	struct afs_vl_cursor vc;
+	struct afs_addr_list *alist = NULL;
+	int ret;
+
+	ret = -ERESTARTSYS;
+	if (afs_begin_vlserver_operation(&vc, cell, key)) {
+		while (afs_select_vlserver(&vc)) {
+			if (test_bit(AFS_VLSERVER_FL_IS_YFS, &vc.server->flags))
+				alist = afs_yfsvl_get_endpoints(&vc, uuid);
+			else
+				alist = afs_vl_get_addrs_u(&vc, uuid);
+		}
+
+		ret = afs_end_vlserver_operation(&vc);
+	}
+
+	return ret < 0 ? ERR_PTR(ret) : alist;
+}
+
+/*
+ * Get or create a fileserver record.
+ */
+struct afs_server *afs_lookup_server(struct afs_cell *cell, struct key *key,
+				     const uuid_t *uuid, u32 addr_version)
+{
+	struct afs_addr_list *alist;
+	struct afs_server *server, *candidate;
+
+	_enter("%p,%pU", cell->net, uuid);
+
+	server = afs_find_server_by_uuid(cell->net, uuid);
+	if (server) {
+		if (server->addr_version != addr_version)
+			set_bit(AFS_SERVER_FL_NEEDS_UPDATE, &server->flags);
+		return server;
+	}
+
+	alist = afs_vl_lookup_addrs(cell, key, uuid);
+	if (IS_ERR(alist))
+		return ERR_CAST(alist);
+
+	candidate = afs_alloc_server(cell, uuid, alist);
+	if (!candidate) {
+		afs_put_addrlist(alist);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	server = afs_install_server(cell, candidate);
+	if (server != candidate) {
+		afs_put_addrlist(alist);
+		kfree(candidate);
+	} else {
+		/* Immediately dispatch an asynchronous probe to each interface
+		 * on the fileserver.  This will make sure the repeat-probing
+		 * service is started.
+		 */
+		afs_fs_probe_fileserver(cell->net, server, key, true);
+	}
+
+	return server;
+}
+
+/*
+ * Set the server timer to fire after a given delay, assuming it's not already
+ * set for an earlier time.
+ */
+static void afs_set_server_timer(struct afs_net *net, time64_t delay)
+{
+	if (net->live) {
+		afs_inc_servers_outstanding(net);
+		if (timer_reduce(&net->fs_timer, jiffies + delay * HZ))
+			afs_dec_servers_outstanding(net);
+	}
+}
+
+/*
+ * Server management timer.  We have an increment on fs_outstanding that we
+ * need to pass along to the work item.
+ */
+void afs_servers_timer(struct timer_list *timer)
+{
+	struct afs_net *net = container_of(timer, struct afs_net, fs_timer);
+
+	_enter("");
+	if (!queue_work(afs_wq, &net->fs_manager))
+		afs_dec_servers_outstanding(net);
+}
+
+/*
+ * Get a reference on a server object.
+ */
+struct afs_server *afs_get_server(struct afs_server *server,
+				  enum afs_server_trace reason)
+{
+	unsigned int a;
+	int r;
+
+	__refcount_inc(&server->ref, &r);
+	a = atomic_read(&server->active);
+	trace_afs_server(server->debug_id, r + 1, a, reason);
+	return server;
+}
+
+/*
+ * Try to get a reference on a server object.
+ */
+static struct afs_server *afs_maybe_use_server(struct afs_server *server,
+					       enum afs_server_trace reason)
+{
+	unsigned int a;
+	int r;
+
+	if (!__refcount_inc_not_zero(&server->ref, &r))
+		return NULL;
+
+	a = atomic_inc_return(&server->active);
+	trace_afs_server(server->debug_id, r + 1, a, reason);
+	return server;
+}
+
+/*
+ * Get an active count on a server object.
+ */
+struct afs_server *afs_use_server(struct afs_server *server, enum afs_server_trace reason)
+{
+	unsigned int a;
+	int r;
+
+	__refcount_inc(&server->ref, &r);
+	a = atomic_inc_return(&server->active);
+
+	trace_afs_server(server->debug_id, r + 1, a, reason);
+	return server;
+}
+
+/*
+ * Release a reference on a server record.
+ */
+void afs_put_server(struct afs_net *net, struct afs_server *server,
+		    enum afs_server_trace reason)
+{
+	unsigned int a, debug_id = server->debug_id;
+	bool zero;
+	int r;
+
+	if (!server)
+		return;
+
+	a = atomic_read(&server->active);
+	zero = __refcount_dec_and_test(&server->ref, &r);
+	trace_afs_server(debug_id, r - 1, a, reason);
+	if (unlikely(zero))
+		__afs_put_server(net, server);
+}
+
+/*
+ * Drop an active count on a server object without updating the last-unused
+ * time.
+ */
+void afs_unuse_server_notime(struct afs_net *net, struct afs_server *server,
+			     enum afs_server_trace reason)
+{
+	if (server) {
+		unsigned int active = atomic_dec_return(&server->active);
+
+		if (active == 0)
+			afs_set_server_timer(net, afs_server_gc_delay);
+		afs_put_server(net, server, reason);
+	}
+}
+
+/*
+ * Drop an active count on a server object.
+ */
+void afs_unuse_server(struct afs_net *net, struct afs_server *server,
+		      enum afs_server_trace reason)
+{
+	if (server) {
+		server->unuse_time = ktime_get_real_seconds();
+		afs_unuse_server_notime(net, server, reason);
+	}
+}
+
+static void afs_server_rcu(struct rcu_head *rcu)
+{
+	struct afs_server *server = container_of(rcu, struct afs_server, rcu);
+
+	trace_afs_server(server->debug_id, refcount_read(&server->ref),
+			 atomic_read(&server->active), afs_server_trace_free);
+	afs_put_addrlist(rcu_access_pointer(server->addresses));
+	kfree(server);
+}
+
+static void __afs_put_server(struct afs_net *net, struct afs_server *server)
+{
+	call_rcu(&server->rcu, afs_server_rcu);
+	afs_dec_servers_outstanding(net);
+}
+
+static void afs_give_up_callbacks(struct afs_net *net, struct afs_server *server)
+{
+	struct afs_addr_list *alist = rcu_access_pointer(server->addresses);
+	struct afs_addr_cursor ac = {
+		.alist	= alist,
+		.index	= alist->preferred,
+		.error	= 0,
+	};
+
+	afs_fs_give_up_all_callbacks(net, server, &ac, NULL);
+}
+
+/*
+ * destroy a dead server
+ */
+static void afs_destroy_server(struct afs_net *net, struct afs_server *server)
+{
+	if (test_bit(AFS_SERVER_FL_MAY_HAVE_CB, &server->flags))
+		afs_give_up_callbacks(net, server);
+
+	flush_work(&server->initcb_work);
+	afs_put_server(net, server, afs_server_trace_destroy);
+}
+
+/*
+ * Garbage collect any expired servers.
+ */
+static void afs_gc_servers(struct afs_net *net, struct afs_server *gc_list)
+{
+	struct afs_server *server, *next, *prev;
+	int active;
+
+	while ((server = gc_list)) {
+		gc_list = server->gc_next;
+
+		write_seqlock(&net->fs_lock);
+
+		active = atomic_read(&server->active);
+		if (active == 0) {
+			trace_afs_server(server->debug_id, refcount_read(&server->ref),
+					 active, afs_server_trace_gc);
+			next = rcu_dereference_protected(
+				server->uuid_next, lockdep_is_held(&net->fs_lock.lock));
+			prev = server->uuid_prev;
+			if (!prev) {
+				/* The one at the front is in the tree */
+				if (!next) {
+					rb_erase(&server->uuid_rb, &net->fs_servers);
+				} else {
+					rb_replace_node_rcu(&server->uuid_rb,
+							    &next->uuid_rb,
+							    &net->fs_servers);
+					next->uuid_prev = NULL;
+				}
+			} else {
+				/* This server is not at the front */
+				rcu_assign_pointer(prev->uuid_next, next);
+				if (next)
+					next->uuid_prev = prev;
+			}
+
+			list_del(&server->probe_link);
+			hlist_del_rcu(&server->proc_link);
+			if (!hlist_unhashed(&server->addr4_link))
+				hlist_del_rcu(&server->addr4_link);
+			if (!hlist_unhashed(&server->addr6_link))
+				hlist_del_rcu(&server->addr6_link);
+		}
+		write_sequnlock(&net->fs_lock);
+
+		if (active == 0)
+			afs_destroy_server(net, server);
+	}
+}
+
+/*
+ * Manage the records of servers known to be within a network namespace.  This
+ * includes garbage collecting unused servers.
+ *
+ * Note also that we were given an increment on net->servers_outstanding by
+ * whoever queued us that we need to deal with before returning.
+ */
+void afs_manage_servers(struct work_struct *work)
+{
+	struct afs_net *net = container_of(work, struct afs_net, fs_manager);
+	struct afs_server *gc_list = NULL;
+	struct rb_node *cursor;
+	time64_t now = ktime_get_real_seconds(), next_manage = TIME64_MAX;
+	bool purging = !net->live;
+
+	_enter("");
+
+	/* Trawl the server list looking for servers that have expired from
+	 * lack of use.
+	 */
+	read_seqlock_excl(&net->fs_lock);
+
+	for (cursor = rb_first(&net->fs_servers); cursor; cursor = rb_next(cursor)) {
+		struct afs_server *server =
+			rb_entry(cursor, struct afs_server, uuid_rb);
+		int active = atomic_read(&server->active);
+
+		_debug("manage %pU %u", &server->uuid, active);
+
+		if (purging) {
+			trace_afs_server(server->debug_id, refcount_read(&server->ref),
+					 active, afs_server_trace_purging);
+			if (active != 0)
+				pr_notice("Can't purge s=%08x\n", server->debug_id);
+		}
+
+		if (active == 0) {
+			time64_t expire_at = server->unuse_time;
+
+			if (!test_bit(AFS_SERVER_FL_VL_FAIL, &server->flags) &&
+			    !test_bit(AFS_SERVER_FL_NOT_FOUND, &server->flags))
+				expire_at += afs_server_gc_delay;
+			if (purging || expire_at <= now) {
+				server->gc_next = gc_list;
+				gc_list = server;
+			} else if (expire_at < next_manage) {
+				next_manage = expire_at;
+			}
+		}
+	}
+
+	read_sequnlock_excl(&net->fs_lock);
+
+	/* Update the timer on the way out.  We have to pass an increment on
+	 * servers_outstanding in the namespace that we are in to the timer or
+	 * the work scheduler.
+	 */
+	if (!purging && next_manage < TIME64_MAX) {
+		now = ktime_get_real_seconds();
+
+		if (next_manage - now <= 0) {
+			if (queue_work(afs_wq, &net->fs_manager))
+				afs_inc_servers_outstanding(net);
+		} else {
+			afs_set_server_timer(net, next_manage - now);
+		}
+	}
+
+	afs_gc_servers(net, gc_list);
+
+	afs_dec_servers_outstanding(net);
+	_leave(" [%d]", atomic_read(&net->servers_outstanding));
+}
+
+static void afs_queue_server_manager(struct afs_net *net)
+{
+	afs_inc_servers_outstanding(net);
+	if (!queue_work(afs_wq, &net->fs_manager))
+		afs_dec_servers_outstanding(net);
+}
+
+/*
+ * Purge list of servers.
+ */
+void afs_purge_servers(struct afs_net *net)
+{
+	_enter("");
+
+	if (del_timer_sync(&net->fs_timer))
+		afs_dec_servers_outstanding(net);
+
+	afs_queue_server_manager(net);
+
+	_debug("wait");
+	atomic_dec(&net->servers_outstanding);
+	wait_var_event(&net->servers_outstanding,
+		       !atomic_read(&net->servers_outstanding));
+	_leave("");
+}
+
+/*
+ * Get an update for a server's address list.
+ */
+static noinline bool afs_update_server_record(struct afs_operation *op,
+					      struct afs_server *server)
+{
+	struct afs_addr_list *alist, *discard;
+
+	_enter("");
+
+	trace_afs_server(server->debug_id, refcount_read(&server->ref),
+			 atomic_read(&server->active),
+			 afs_server_trace_update);
+
+	alist = afs_vl_lookup_addrs(op->volume->cell, op->key, &server->uuid);
+	if (IS_ERR(alist)) {
+		if ((PTR_ERR(alist) == -ERESTARTSYS ||
+		     PTR_ERR(alist) == -EINTR) &&
+		    (op->flags & AFS_OPERATION_UNINTR) &&
+		    server->addresses) {
+			_leave(" = t [intr]");
+			return true;
+		}
+		op->error = PTR_ERR(alist);
+		_leave(" = f [%d]", op->error);
+		return false;
+	}
+
+	discard = alist;
+	if (server->addr_version != alist->version) {
+		write_lock(&server->fs_lock);
+		discard = rcu_dereference_protected(server->addresses,
+						    lockdep_is_held(&server->fs_lock));
+		rcu_assign_pointer(server->addresses, alist);
+		server->addr_version = alist->version;
+		write_unlock(&server->fs_lock);
+	}
+
+	afs_put_addrlist(discard);
+	_leave(" = t");
+	return true;
+}
+
+/*
+ * See if a server's address list needs updating.
+ */
+bool afs_check_server_record(struct afs_operation *op, struct afs_server *server)
+{
+	bool success;
+	int ret, retries = 0;
+
+	_enter("");
+
+	ASSERT(server);
+
+retry:
+	if (test_bit(AFS_SERVER_FL_UPDATING, &server->flags))
+		goto wait;
+	if (test_bit(AFS_SERVER_FL_NEEDS_UPDATE, &server->flags))
+		goto update;
+	_leave(" = t [good]");
+	return true;
+
+update:
+	if (!test_and_set_bit_lock(AFS_SERVER_FL_UPDATING, &server->flags)) {
+		clear_bit(AFS_SERVER_FL_NEEDS_UPDATE, &server->flags);
+		success = afs_update_server_record(op, server);
+		clear_bit_unlock(AFS_SERVER_FL_UPDATING, &server->flags);
+		wake_up_bit(&server->flags, AFS_SERVER_FL_UPDATING);
+		_leave(" = %d", success);
+		return success;
+	}
+
+wait:
+	ret = wait_on_bit(&server->flags, AFS_SERVER_FL_UPDATING,
+			  (op->flags & AFS_OPERATION_UNINTR) ?
+			  TASK_UNINTERRUPTIBLE : TASK_INTERRUPTIBLE);
+	if (ret == -ERESTARTSYS) {
+		op->error = ret;
+		_leave(" = f [intr]");
+		return false;
+	}
+
+	retries++;
+	if (retries == 4) {
+		_leave(" = f [stale]");
+		ret = -ESTALE;
+		return false;
+	}
+	goto retry;
+}