Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) The forcedeth conversion from pci_*() DMA interfaces to dma_*() ones
    missed one spot. From Zhu Yanjun.

 2) Missing CRYPTO_SHA256 Kconfig dep in cfg80211, from Johannes Berg.

 3) Fix checksum offloading in thunderx driver, from Sunil Goutham.

 4) Add SPDX to vm_sockets_diag.h, from Stephen Hemminger.

 5) Fix use after free of packet headers in TIPC, from Jon Maloy.

 6) "sizeof(ptr)" vs "sizeof(*ptr)" bug in i40e, from Gustavo A R Silva.

 7) Tunneling fixes in mlxsw driver, from Petr Machata.

 8) Fix crash in fanout_demux_rollover() of AF_PACKET, from Mike
    Maloney.

 9) Fix race in AF_PACKET bind() vs. NETDEV_UP notifier, from Eric
    Dumazet.

10) Fix regression in sch_sfq.c due to one of the timer_setup()
    conversions. From Paolo Abeni.

11) SCTP does list_for_each_entry() using wrong struct member, fix from
    Xin Long.

12) Don't use big endian netlink attribute read for
    IFLA_BOND_AD_ACTOR_SYSTEM, it is in cpu endianness. Also from Xin
    Long.

13) Fix mis-initialization of q->link.clock in CBQ scheduler, preventing
    adding filters there. From Jiri Pirko.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (67 commits)
  ethernet: dwmac-stm32: Fix copyright
  net: via: via-rhine: use %p to format void * address instead of %x
  net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on 64-bit
  myri10ge: Update MAINTAINERS
  net: sched: cbq: create block for q->link.block
  atm: suni: remove extraneous space to fix indentation
  atm: lanai: use %p to format kernel addresses instead of %x
  VSOCK: Don't set sk_state to TCP_CLOSE before testing it
  atm: fore200e: use %pK to format kernel addresses instead of %x
  ambassador: fix incorrect indentation of assignment statement
  vxlan: use __be32 type for the param vni in __vxlan_fdb_delete
  bonding: use nla_get_u64 to extract the value for IFLA_BOND_AD_ACTOR_SYSTEM
  sctp: use right member as the param of list_for_each_entry
  sch_sfq: fix null pointer dereference at timer expiration
  cls_bpf: don't decrement net's refcount when offload fails
  net/packet: fix a race in packet_bind() and packet_notifier()
  packet: fix crash in fanout_demux_rollover()
  sctp: remove extern from stream sched
  sctp: force the params with right types for sctp csum apis
  sctp: force SCTP_ERROR_INV_STRM with __u32 when calling sctp_chunk_fail
  ...

15 files changed, 688 insertions, 302 deletions

diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 9b5c46b052fd..8f7cf4c042be 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -285,6 +285,7 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 					   bool upgrade)
 {
 	struct rxrpc_conn_parameters cp;
+	struct rxrpc_call_params p;
 	struct rxrpc_call *call;
 	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 	int ret;
@@ -302,6 +303,10 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 	if (key && !key->payload.data[0])
 		key = NULL; /* a no-security key */
 
+	memset(&p, 0, sizeof(p));
+	p.user_call_ID = user_call_ID;
+	p.tx_total_len = tx_total_len;
+
 	memset(&cp, 0, sizeof(cp));
 	cp.local		= rx->local;
 	cp.key			= key;
@@ -309,8 +314,7 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 	cp.exclusive		= false;
 	cp.upgrade		= upgrade;
 	cp.service_id		= srx->srx_service;
-	call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, tx_total_len,
-				     gfp);
+	call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp);
 	/* The socket has been unlocked. */
 	if (!IS_ERR(call)) {
 		call->notify_rx = notify_rx;
@@ -863,6 +867,19 @@ static int rxrpc_release_sock(struct sock *sk)
 	sock_orphan(sk);
 	sk->sk_shutdown = SHUTDOWN_MASK;
 
+	/* We want to kill off all connections from a service socket
+	 * as fast as possible because we can't share these; client
+	 * sockets, on the other hand, can share an endpoint.
+	 */
+	switch (sk->sk_state) {
+	case RXRPC_SERVER_BOUND:
+	case RXRPC_SERVER_BOUND2:
+	case RXRPC_SERVER_LISTENING:
+	case RXRPC_SERVER_LISTEN_DISABLED:
+		rx->local->service_closed = true;
+		break;
+	}
+
 	spin_lock_bh(&sk->sk_receive_queue.lock);
 	sk->sk_state = RXRPC_CLOSE;
 	spin_unlock_bh(&sk->sk_receive_queue.lock);
@@ -878,6 +895,8 @@ static int rxrpc_release_sock(struct sock *sk)
 	rxrpc_release_calls_on_socket(rx);
 	flush_workqueue(rxrpc_workqueue);
 	rxrpc_purge_queue(&sk->sk_receive_queue);
+	rxrpc_queue_work(&rx->local->rxnet->service_conn_reaper);
+	rxrpc_queue_work(&rx->local->rxnet->client_conn_reaper);
 
 	rxrpc_put_local(rx->local);
 	rx->local = NULL;
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index b2151993d384..416688381eb7 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -79,17 +79,20 @@ struct rxrpc_net {
 	struct list_head	conn_proc_list;	/* List of conns in this namespace for proc */
 	struct list_head	service_conns;	/* Service conns in this namespace */
 	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
-	struct delayed_work	service_conn_reaper;
+	struct work_struct	service_conn_reaper;
+	struct timer_list	service_conn_reap_timer;
 
 	unsigned int		nr_client_conns;
 	unsigned int		nr_active_client_conns;
 	bool			kill_all_client_conns;
+	bool			live;
 	spinlock_t		client_conn_cache_lock; /* Lock for ->*_client_conns */
 	spinlock_t		client_conn_discard_lock; /* Prevent multiple discarders */
 	struct list_head	waiting_client_conns;
 	struct list_head	active_client_conns;
 	struct list_head	idle_client_conns;
-	struct delayed_work	client_conn_reaper;
+	struct work_struct	client_conn_reaper;
+	struct timer_list	client_conn_reap_timer;
 
 	struct list_head	local_endpoints;
 	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
@@ -265,6 +268,7 @@ struct rxrpc_local {
 	rwlock_t		services_lock;	/* lock for services list */
 	int			debug_id;	/* debug ID for printks */
 	bool			dead;
+	bool			service_closed;	/* Service socket closed */
 	struct sockaddr_rxrpc	srx;		/* local address */
 };
 
@@ -338,8 +342,17 @@ enum rxrpc_conn_flag {
 	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
 	RXRPC_CONN_COUNTED,		/* Counted by rxrpc_nr_client_conns */
 	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
+	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
+	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
+	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
+	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
 };
 
+#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
+				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
+				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
+				   (1UL << RXRPC_CONN_FINAL_ACK_3))
+
 /*
  * Events that can be raised upon a connection.
  */
@@ -393,6 +406,7 @@ struct rxrpc_connection {
 #define RXRPC_ACTIVE_CHANS_MASK	((1 << RXRPC_MAXCALLS) - 1)
 	struct list_head	waiting_calls;	/* Calls waiting for channels */
 	struct rxrpc_channel {
+		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
 		struct rxrpc_call __rcu	*call;		/* Active call */
 		u32			call_id;	/* ID of current call */
 		u32			call_counter;	/* Call ID counter */
@@ -404,6 +418,7 @@ struct rxrpc_connection {
 		};
 	} channels[RXRPC_MAXCALLS];
 
+	struct timer_list	timer;		/* Conn event timer */
 	struct work_struct	processor;	/* connection event processor */
 	union {
 		struct rb_node	client_node;	/* Node in local->client_conns */
@@ -457,9 +472,10 @@ enum rxrpc_call_flag {
 enum rxrpc_call_event {
 	RXRPC_CALL_EV_ACK,		/* need to generate ACK */
 	RXRPC_CALL_EV_ABORT,		/* need to generate abort */
-	RXRPC_CALL_EV_TIMER,		/* Timer expired */
 	RXRPC_CALL_EV_RESEND,		/* Tx resend required */
 	RXRPC_CALL_EV_PING,		/* Ping send required */
+	RXRPC_CALL_EV_EXPIRED,		/* Expiry occurred */
+	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
 };
 
 /*
@@ -503,10 +519,16 @@ struct rxrpc_call {
 	struct rxrpc_peer	*peer;		/* Peer record for remote address */
 	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
 	struct mutex		user_mutex;	/* User access mutex */
-	ktime_t			ack_at;		/* When deferred ACK needs to happen */
-	ktime_t			resend_at;	/* When next resend needs to happen */
-	ktime_t			ping_at;	/* When next to send a ping */
-	ktime_t			expire_at;	/* When the call times out */
+	unsigned long		ack_at;		/* When deferred ACK needs to happen */
+	unsigned long		ack_lost_at;	/* When ACK is figured as lost */
+	unsigned long		resend_at;	/* When next resend needs to happen */
+	unsigned long		ping_at;	/* When next to send a ping */
+	unsigned long		keepalive_at;	/* When next to send a keepalive ping */
+	unsigned long		expect_rx_by;	/* When we expect to get a packet by */
+	unsigned long		expect_req_by;	/* When we expect to get a request DATA packet by */
+	unsigned long		expect_term_by;	/* When we expect call termination by */
+	u32			next_rx_timo;	/* Timeout for next Rx packet (jif) */
+	u32			next_req_timo;	/* Timeout for next Rx request packet (jif) */
 	struct timer_list	timer;		/* Combined event timer */
 	struct work_struct	processor;	/* Event processor */
 	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
@@ -609,6 +631,8 @@ struct rxrpc_call {
 	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
 	rxrpc_serial_t		acks_latest;	/* serial number of latest ACK received */
 	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
+	rxrpc_seq_t		acks_lost_top;	/* tx_top at the time lost-ack ping sent */
+	rxrpc_serial_t		acks_lost_ping;	/* Serial number of probe ACK */
 };
 
 /*
@@ -632,6 +656,35 @@ struct rxrpc_ack_summary {
 	u8			cumulative_acks;
 };
 
+/*
+ * sendmsg() cmsg-specified parameters.
+ */
+enum rxrpc_command {
+	RXRPC_CMD_SEND_DATA,		/* send data message */
+	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
+	RXRPC_CMD_ACCEPT,		/* [server] accept incoming call */
+	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
+};
+
+struct rxrpc_call_params {
+	s64			tx_total_len;	/* Total Tx data length (if send data) */
+	unsigned long		user_call_ID;	/* User's call ID */
+	struct {
+		u32		hard;		/* Maximum lifetime (sec) */
+		u32		idle;		/* Max time since last data packet (msec) */
+		u32		normal;		/* Max time since last call packet (msec) */
+	} timeouts;
+	u8			nr_timeouts;	/* Number of timeouts specified */
+};
+
+struct rxrpc_send_params {
+	struct rxrpc_call_params call;
+	u32			abort_code;	/* Abort code to Tx (if abort) */
+	enum rxrpc_command	command : 8;	/* The command to implement */
+	bool			exclusive;	/* Shared or exclusive call */
+	bool			upgrade;	/* If the connection is upgradeable */
+};
+
 #include <trace/events/rxrpc.h>
 
 /*
@@ -657,12 +710,19 @@ int rxrpc_reject_call(struct rxrpc_sock *);
 /*
  * call_event.c
  */
-void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
-void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 		       enum rxrpc_propose_ack_trace);
 void rxrpc_process_call(struct work_struct *);
 
+static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
+					   unsigned long expire_at,
+					   unsigned long now,
+					   enum rxrpc_timer_trace why)
+{
+	trace_rxrpc_timer(call, why, now);
+	timer_reduce(&call->timer, expire_at);
+}
+
 /*
  * call_object.c
  */
@@ -672,11 +732,11 @@ extern unsigned int rxrpc_max_call_lifetime;
 extern struct kmem_cache *rxrpc_call_jar;
 
 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
-struct rxrpc_call *rxrpc_alloc_call(gfp_t);
+struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t);
 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 					 struct rxrpc_conn_parameters *,
 					 struct sockaddr_rxrpc *,
-					 unsigned long, s64, gfp_t);
+					 struct rxrpc_call_params *, gfp_t);
 int rxrpc_retry_client_call(struct rxrpc_sock *,
 			    struct rxrpc_call *,
 			    struct rxrpc_conn_parameters *,
@@ -803,8 +863,8 @@ static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
  */
 extern unsigned int rxrpc_max_client_connections;
 extern unsigned int rxrpc_reap_client_connections;
-extern unsigned int rxrpc_conn_idle_client_expiry;
-extern unsigned int rxrpc_conn_idle_client_fast_expiry;
+extern unsigned long rxrpc_conn_idle_client_expiry;
+extern unsigned long rxrpc_conn_idle_client_fast_expiry;
 extern struct idr rxrpc_client_conn_ids;
 
 void rxrpc_destroy_client_conn_ids(void);
@@ -825,6 +885,7 @@ void rxrpc_process_connection(struct work_struct *);
  * conn_object.c
  */
 extern unsigned int rxrpc_connection_expiry;
+extern unsigned int rxrpc_closed_conn_expiry;
 
 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
@@ -861,6 +922,12 @@ static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 		rxrpc_put_service_conn(conn);
 }
 
+static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
+					   unsigned long expire_at)
+{
+	timer_reduce(&conn->timer, expire_at);
+}
+
 /*
  * conn_service.c
  */
@@ -930,13 +997,13 @@ static inline void rxrpc_queue_local(struct rxrpc_local *local)
  * misc.c
  */
 extern unsigned int rxrpc_max_backlog __read_mostly;
-extern unsigned int rxrpc_requested_ack_delay;
-extern unsigned int rxrpc_soft_ack_delay;
-extern unsigned int rxrpc_idle_ack_delay;
+extern unsigned long rxrpc_requested_ack_delay;
+extern unsigned long rxrpc_soft_ack_delay;
+extern unsigned long rxrpc_idle_ack_delay;
 extern unsigned int rxrpc_rx_window_size;
 extern unsigned int rxrpc_rx_mtu;
 extern unsigned int rxrpc_rx_jumbo_max;
-extern unsigned int rxrpc_resend_timeout;
+extern unsigned long rxrpc_resend_timeout;
 
 extern const s8 rxrpc_ack_priority[];
 
@@ -954,7 +1021,7 @@ static inline struct rxrpc_net *rxrpc_net(struct net *net)
 /*
  * output.c
  */
-int rxrpc_send_ack_packet(struct rxrpc_call *, bool);
+int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
 int rxrpc_send_abort_packet(struct rxrpc_call *);
 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
 void rxrpc_reject_packets(struct rxrpc_local *);
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index cbd1701e813a..3028298ca561 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -94,7 +94,7 @@ static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
 	/* Now it gets complicated, because calls get registered with the
 	 * socket here, particularly if a user ID is preassigned by the user.
 	 */
-	call = rxrpc_alloc_call(gfp);
+	call = rxrpc_alloc_call(rx, gfp);
 	if (!call)
 		return -ENOMEM;
 	call->flags |= (1 << RXRPC_CALL_IS_SERVICE);
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 3574508baf9a..bda952ffe6a6 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -22,80 +22,6 @@
 #include "ar-internal.h"
 
 /*
- * Set the timer
- */
-void __rxrpc_set_timer(struct rxrpc_call *call, enum rxrpc_timer_trace why,
-		       ktime_t now)
-{
-	unsigned long t_j, now_j = jiffies;
-	ktime_t t;
-	bool queue = false;
-
-	if (call->state < RXRPC_CALL_COMPLETE) {
-		t = call->expire_at;
-		if (!ktime_after(t, now)) {
-			trace_rxrpc_timer(call, why, now, now_j);
-			queue = true;
-			goto out;
-		}
-
-		if (!ktime_after(call->resend_at, now)) {
-			call->resend_at = call->expire_at;
-			if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
-				queue = true;
-		} else if (ktime_before(call->resend_at, t)) {
-			t = call->resend_at;
-		}
-
-		if (!ktime_after(call->ack_at, now)) {
-			call->ack_at = call->expire_at;
-			if (!test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events))
-				queue = true;
-		} else if (ktime_before(call->ack_at, t)) {
-			t = call->ack_at;
-		}
-
-		if (!ktime_after(call->ping_at, now)) {
-			call->ping_at = call->expire_at;
-			if (!test_and_set_bit(RXRPC_CALL_EV_PING, &call->events))
-				queue = true;
-		} else if (ktime_before(call->ping_at, t)) {
-			t = call->ping_at;
-		}
-
-		t_j = nsecs_to_jiffies(ktime_to_ns(ktime_sub(t, now)));
-		t_j += jiffies;
-
-		/* We have to make sure that the calculated jiffies value falls
-		 * at or after the nsec value, or we may loop ceaselessly
-		 * because the timer times out, but we haven't reached the nsec
-		 * timeout yet.
-		 */
-		t_j++;
-
-		if (call->timer.expires != t_j || !timer_pending(&call->timer)) {
-			mod_timer(&call->timer, t_j);
-			trace_rxrpc_timer(call, why, now, now_j);
-		}
-	}
-
-out:
-	if (queue)
-		rxrpc_queue_call(call);
-}
-
-/*
- * Set the timer
- */
-void rxrpc_set_timer(struct rxrpc_call *call, enum rxrpc_timer_trace why,
-		     ktime_t now)
-{
-	read_lock_bh(&call->state_lock);
-	__rxrpc_set_timer(call, why, now);
-	read_unlock_bh(&call->state_lock);
-}
-
-/*
  * Propose a PING ACK be sent.
  */
 static void rxrpc_propose_ping(struct rxrpc_call *call,
@@ -106,12 +32,13 @@ static void rxrpc_propose_ping(struct rxrpc_call *call,
 		    !test_and_set_bit(RXRPC_CALL_EV_PING, &call->events))
 			rxrpc_queue_call(call);
 	} else {
-		ktime_t now = ktime_get_real();
-		ktime_t ping_at = ktime_add_ms(now, rxrpc_idle_ack_delay);
+		unsigned long now = jiffies;
+		unsigned long ping_at = now + rxrpc_idle_ack_delay;
 
-		if (ktime_before(ping_at, call->ping_at)) {
-			call->ping_at = ping_at;
-			rxrpc_set_timer(call, rxrpc_timer_set_for_ping, now);
+		if (time_before(ping_at, call->ping_at)) {
+			WRITE_ONCE(call->ping_at, ping_at);
+			rxrpc_reduce_call_timer(call, ping_at, now,
+						rxrpc_timer_set_for_ping);
 		}
 	}
 }
@@ -125,8 +52,7 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
 				enum rxrpc_propose_ack_trace why)
 {
 	enum rxrpc_propose_ack_outcome outcome = rxrpc_propose_ack_use;
-	unsigned int expiry = rxrpc_soft_ack_delay;
-	ktime_t now, ack_at;
+	unsigned long expiry = rxrpc_soft_ack_delay;
 	s8 prior = rxrpc_ack_priority[ack_reason];
 
 	/* Pings are handled specially because we don't want to accidentally
@@ -190,11 +116,18 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
 		    background)
 			rxrpc_queue_call(call);
 	} else {
-		now = ktime_get_real();
-		ack_at = ktime_add_ms(now, expiry);
-		if (ktime_before(ack_at, call->ack_at)) {
-			call->ack_at = ack_at;
-			rxrpc_set_timer(call, rxrpc_timer_set_for_ack, now);
+		unsigned long now = jiffies, ack_at;
+
+		if (call->peer->rtt_usage > 0)
+			ack_at = nsecs_to_jiffies(call->peer->rtt);
+		else
+			ack_at = expiry;
+
+		ack_at = jiffies + expiry;
+		if (time_before(ack_at, call->ack_at)) {
+			WRITE_ONCE(call->ack_at, ack_at);
+			rxrpc_reduce_call_timer(call, ack_at, now,
+						rxrpc_timer_set_for_ack);
 		}
 	}
 
@@ -227,18 +160,28 @@ static void rxrpc_congestion_timeout(struct rxrpc_call *call)
 /*
  * Perform retransmission of NAK'd and unack'd packets.
  */
-static void rxrpc_resend(struct rxrpc_call *call, ktime_t now)
+static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
 {
 	struct rxrpc_skb_priv *sp;
 	struct sk_buff *skb;
+	unsigned long resend_at;
 	rxrpc_seq_t cursor, seq, top;
-	ktime_t max_age, oldest, ack_ts;
+	ktime_t now, max_age, oldest, ack_ts, timeout, min_timeo;
 	int ix;
 	u8 annotation, anno_type, retrans = 0, unacked = 0;
 
 	_enter("{%d,%d}", call->tx_hard_ack, call->tx_top);
 
-	max_age = ktime_sub_ms(now, rxrpc_resend_timeout);
+	if (call->peer->rtt_usage > 1)
+		timeout = ns_to_ktime(call->peer->rtt * 3 / 2);
+	else
+		timeout = ms_to_ktime(rxrpc_resend_timeout);
+	min_timeo = ns_to_ktime((1000000000 / HZ) * 4);
+	if (ktime_before(timeout, min_timeo))
+		timeout = min_timeo;
+
+	now = ktime_get_real();
+	max_age = ktime_sub(now, timeout);
 
 	spin_lock_bh(&call->lock);
 
@@ -282,7 +225,9 @@ static void rxrpc_resend(struct rxrpc_call *call, ktime_t now)
 				       ktime_to_ns(ktime_sub(skb->tstamp, max_age)));
 	}
 
-	call->resend_at = ktime_add_ms(oldest, rxrpc_resend_timeout);
+	resend_at = nsecs_to_jiffies(ktime_to_ns(ktime_sub(oldest, now)));
+	resend_at += jiffies + rxrpc_resend_timeout;
+	WRITE_ONCE(call->resend_at, resend_at);
 
 	if (unacked)
 		rxrpc_congestion_timeout(call);
@@ -292,14 +237,15 @@ static void rxrpc_resend(struct rxrpc_call *call, ktime_t now)
 	 * retransmitting data.
 	 */
 	if (!retrans) {
-		rxrpc_set_timer(call, rxrpc_timer_set_for_resend, now);
+		rxrpc_reduce_call_timer(call, resend_at, now,
+					rxrpc_timer_set_for_resend);
 		spin_unlock_bh(&call->lock);
 		ack_ts = ktime_sub(now, call->acks_latest_ts);
 		if (ktime_to_ns(ack_ts) < call->peer->rtt)
 			goto out;
 		rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, 0, true, false,
 				  rxrpc_propose_ack_ping_for_lost_ack);
-		rxrpc_send_ack_packet(call, true);
+		rxrpc_send_ack_packet(call, true, NULL);
 		goto out;
 	}
 
@@ -364,7 +310,8 @@ void rxrpc_process_call(struct work_struct *work)
 {
 	struct rxrpc_call *call =
 		container_of(work, struct rxrpc_call, processor);
-	ktime_t now;
+	rxrpc_serial_t *send_ack;
+	unsigned long now, next, t;
 
 	rxrpc_see_call(call);
 
@@ -384,22 +331,89 @@ recheck_state:
 		goto out_put;
 	}
 
-	now = ktime_get_real();
-	if (ktime_before(call->expire_at, now)) {
+	/* Work out if any timeouts tripped */
+	now = jiffies;
+	t = READ_ONCE(call->expect_rx_by);
+	if (time_after_eq(now, t)) {
+		trace_rxrpc_timer(call, rxrpc_timer_exp_normal, now);
+		set_bit(RXRPC_CALL_EV_EXPIRED, &call->events);
+	}
+
+	t = READ_ONCE(call->expect_req_by);
+	if (call->state == RXRPC_CALL_SERVER_RECV_REQUEST &&
+	    time_after_eq(now, t)) {
+		trace_rxrpc_timer(call, rxrpc_timer_exp_idle, now);
+		set_bit(RXRPC_CALL_EV_EXPIRED, &call->events);
+	}
+
+	t = READ_ONCE(call->expect_term_by);
+	if (time_after_eq(now, t)) {
+		trace_rxrpc_timer(call, rxrpc_timer_exp_hard, now);
+		set_bit(RXRPC_CALL_EV_EXPIRED, &call->events);
+	}
+
+	t = READ_ONCE(call->ack_at);
+	if (time_after_eq(now, t)) {
+		trace_rxrpc_timer(call, rxrpc_timer_exp_ack, now);
+		cmpxchg(&call->ack_at, t, now + MAX_JIFFY_OFFSET);
+		set_bit(RXRPC_CALL_EV_ACK, &call->events);
+	}
+
+	t = READ_ONCE(call->ack_lost_at);
+	if (time_after_eq(now, t)) {
+		trace_rxrpc_timer(call, rxrpc_timer_exp_lost_ack, now);
+		cmpxchg(&call->ack_lost_at, t, now + MAX_JIFFY_OFFSET);
+		set_bit(RXRPC_CALL_EV_ACK_LOST, &call->events);
+	}
+
+	t = READ_ONCE(call->keepalive_at);
+	if (time_after_eq(now, t)) {
+		trace_rxrpc_timer(call, rxrpc_timer_exp_keepalive, now);
+		cmpxchg(&call->keepalive_at, t, now + MAX_JIFFY_OFFSET);
+		rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, 0, true, true,
+				  rxrpc_propose_ack_ping_for_keepalive);
+		set_bit(RXRPC_CALL_EV_PING, &call->events);
+	}
+
+	t = READ_ONCE(call->ping_at);
+	if (time_after_eq(now, t)) {
+		trace_rxrpc_timer(call, rxrpc_timer_exp_ping, now);
+		cmpxchg(&call->ping_at, t, now + MAX_JIFFY_OFFSET);
+		set_bit(RXRPC_CALL_EV_PING, &call->events);
+	}
+
+	t = READ_ONCE(call->resend_at);
+	if (time_after_eq(now, t)) {
+		trace_rxrpc_timer(call, rxrpc_timer_exp_resend, now);
+		cmpxchg(&call->resend_at, t, now + MAX_JIFFY_OFFSET);
+		set_bit(RXRPC_CALL_EV_RESEND, &call->events);
+	}
+
+	/* Process events */
+	if (test_and_clear_bit(RXRPC_CALL_EV_EXPIRED, &call->events)) {
 		rxrpc_abort_call("EXP", call, 0, RX_USER_ABORT, -ETIME);
 		set_bit(RXRPC_CALL_EV_ABORT, &call->events);
 		goto recheck_state;
 	}
 
-	if (test_and_clear_bit(RXRPC_CALL_EV_ACK, &call->events)) {
+	send_ack = NULL;
+	if (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events)) {
+		call->acks_lost_top = call->tx_top;
+		rxrpc_propose_ACK(call, RXRPC_ACK_PING, 0, 0, true, false,
+				  rxrpc_propose_ack_ping_for_lost_ack);
+		send_ack = &call->acks_lost_ping;
+	}
+
+	if (test_and_clear_bit(RXRPC_CALL_EV_ACK, &call->events) ||
+	    send_ack) {
 		if (call->ackr_reason) {
-			rxrpc_send_ack_packet(call, false);
+			rxrpc_send_ack_packet(call, false, send_ack);
 			goto recheck_state;
 		}
 	}
 
 	if (test_and_clear_bit(RXRPC_CALL_EV_PING, &call->events)) {
-		rxrpc_send_ack_packet(call, true);
+		rxrpc_send_ack_packet(call, true, NULL);
 		goto recheck_state;
 	}
 
@@ -408,7 +422,24 @@ recheck_state:
 		goto recheck_state;
 	}
 
-	rxrpc_set_timer(call, rxrpc_timer_set_for_resend, now);
+	/* Make sure the timer is restarted */
+	next = call->expect_rx_by;
+
+#define set(T) { t = READ_ONCE(T); if (time_before(t, next)) next = t; }
+	
+	set(call->expect_req_by);
+	set(call->expect_term_by);
+	set(call->ack_at);
+	set(call->ack_lost_at);
+	set(call->resend_at);
+	set(call->keepalive_at);
+	set(call->ping_at);
+
+	now = jiffies;
+	if (time_after_eq(now, next))
+		goto recheck_state;
+
+	rxrpc_reduce_call_timer(call, next, now, rxrpc_timer_restart);
 
 	/* other events may have been raised since we started checking */
 	if (call->events && call->state < RXRPC_CALL_COMPLETE) {
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 994dc2df57e4..0b2db38dd32d 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -51,10 +51,14 @@ static void rxrpc_call_timer_expired(struct timer_list *t)
 
 	_enter("%d", call->debug_id);
 
-	if (call->state < RXRPC_CALL_COMPLETE)
-		rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real());
+	if (call->state < RXRPC_CALL_COMPLETE) {
+		trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
+		rxrpc_queue_call(call);
+	}
 }
 
+static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
+
 /*
  * find an extant server call
  * - called in process context with IRQs enabled
@@ -95,7 +99,7 @@ found_extant_call:
 /*
  * allocate a new call
  */
-struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
+struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp)
 {
 	struct rxrpc_call *call;
 
@@ -114,6 +118,14 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
 		goto nomem_2;
 
 	mutex_init(&call->user_mutex);
+
+	/* Prevent lockdep reporting a deadlock false positive between the afs
+	 * filesystem and sys_sendmsg() via the mmap sem.
+	 */
+	if (rx->sk.sk_kern_sock)
+		lockdep_set_class(&call->user_mutex,
+				  &rxrpc_call_user_mutex_lock_class_key);
+
 	timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
 	INIT_WORK(&call->processor, &rxrpc_process_call);
 	INIT_LIST_HEAD(&call->link);
@@ -128,6 +140,8 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
 	atomic_set(&call->usage, 1);
 	call->debug_id = atomic_inc_return(&rxrpc_debug_id);
 	call->tx_total_len = -1;
+	call->next_rx_timo = 20 * HZ;
+	call->next_req_timo = 1 * HZ;
 
 	memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 
@@ -150,7 +164,8 @@ nomem:
 /*
  * Allocate a new client call.
  */
-static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
+static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
+						  struct sockaddr_rxrpc *srx,
 						  gfp_t gfp)
 {
 	struct rxrpc_call *call;
@@ -158,7 +173,7 @@ static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
 
 	_enter("");
 
-	call = rxrpc_alloc_call(gfp);
+	call = rxrpc_alloc_call(rx, gfp);
 	if (!call)
 		return ERR_PTR(-ENOMEM);
 	call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
@@ -177,15 +192,17 @@ static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
  */
 static void rxrpc_start_call_timer(struct rxrpc_call *call)
 {
-	ktime_t now = ktime_get_real(), expire_at;
-
-	expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime);
-	call->expire_at = expire_at;
-	call->ack_at = expire_at;
-	call->ping_at = expire_at;
-	call->resend_at = expire_at;
-	call->timer.expires = jiffies + LONG_MAX / 2;
-	rxrpc_set_timer(call, rxrpc_timer_begin, now);
+	unsigned long now = jiffies;
+	unsigned long j = now + MAX_JIFFY_OFFSET;
+
+	call->ack_at = j;
+	call->ack_lost_at = j;
+	call->resend_at = j;
+	call->ping_at = j;
+	call->expect_rx_by = j;
+	call->expect_req_by = j;
+	call->expect_term_by = j;
+	call->timer.expires = now;
 }
 
 /*
@@ -196,8 +213,7 @@ static void rxrpc_start_call_timer(struct rxrpc_call *call)
 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 					 struct rxrpc_conn_parameters *cp,
 					 struct sockaddr_rxrpc *srx,
-					 unsigned long user_call_ID,
-					 s64 tx_total_len,
+					 struct rxrpc_call_params *p,
 					 gfp_t gfp)
 	__releases(&rx->sk.sk_lock.slock)
 {
@@ -207,18 +223,18 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 	const void *here = __builtin_return_address(0);
 	int ret;
 
-	_enter("%p,%lx", rx, user_call_ID);
+	_enter("%p,%lx", rx, p->user_call_ID);
 
-	call = rxrpc_alloc_client_call(srx, gfp);
+	call = rxrpc_alloc_client_call(rx, srx, gfp);
 	if (IS_ERR(call)) {
 		release_sock(&rx->sk);
 		_leave(" = %ld", PTR_ERR(call));
 		return call;
 	}
 
-	call->tx_total_len = tx_total_len;
+	call->tx_total_len = p->tx_total_len;
 	trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
-			 here, (const void *)user_call_ID);
+			 here, (const void *)p->user_call_ID);
 
 	/* We need to protect a partially set up call against the user as we
 	 * will be acting outside the socket lock.
@@ -234,16 +250,16 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
 		parent = *pp;
 		xcall = rb_entry(parent, struct rxrpc_call, sock_node);
 
-		if (user_call_ID < xcall->user_call_ID)
+		if (p->user_call_ID < xcall->user_call_ID)
 			pp = &(*pp)->rb_left;
-		else if (user_call_ID > xcall->user_call_ID)
+		else if (p->user_call_ID > xcall->user_call_ID)
 			pp = &(*pp)->rb_right;
 		else
 			goto error_dup_user_ID;
 	}
 
 	rcu_assign_pointer(call->socket, rx);
-	call->user_call_ID = user_call_ID;
+	call->user_call_ID = p->user_call_ID;
 	__set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
 	rxrpc_get_call(call, rxrpc_call_got_userid);
 	rb_link_node(&call->sock_node, parent, pp);
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index 5f9624bd311c..7f74ca3059f8 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -85,8 +85,8 @@
 
 __read_mostly unsigned int rxrpc_max_client_connections = 1000;
 __read_mostly unsigned int rxrpc_reap_client_connections = 900;
-__read_mostly unsigned int rxrpc_conn_idle_client_expiry = 2 * 60 * HZ;
-__read_mostly unsigned int rxrpc_conn_idle_client_fast_expiry = 2 * HZ;
+__read_mostly unsigned long rxrpc_conn_idle_client_expiry = 2 * 60 * HZ;
+__read_mostly unsigned long rxrpc_conn_idle_client_fast_expiry = 2 * HZ;
 
 /*
  * We use machine-unique IDs for our client connections.
@@ -554,6 +554,11 @@ static void rxrpc_activate_one_channel(struct rxrpc_connection *conn,
 
 	trace_rxrpc_client(conn, channel, rxrpc_client_chan_activate);
 
+	/* Cancel the final ACK on the previous call if it hasn't been sent yet
+	 * as the DATA packet will implicitly ACK it.
+	 */
+	clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
+
 	write_lock_bh(&call->state_lock);
 	if (!test_bit(RXRPC_CALL_TX_LASTQ, &call->flags))
 		call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
@@ -686,7 +691,7 @@ int rxrpc_connect_call(struct rxrpc_call *call,
 
 	_enter("{%d,%lx},", call->debug_id, call->user_call_ID);
 
-	rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper.work);
+	rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper);
 	rxrpc_cull_active_client_conns(rxnet);
 
 	ret = rxrpc_get_client_conn(call, cp, srx, gfp);
@@ -752,6 +757,18 @@ void rxrpc_expose_client_call(struct rxrpc_call *call)
 }
 
 /*
+ * Set the reap timer.
+ */
+static void rxrpc_set_client_reap_timer(struct rxrpc_net *rxnet)
+{
+	unsigned long now = jiffies;
+	unsigned long reap_at = now + rxrpc_conn_idle_client_expiry;
+
+	if (rxnet->live)
+		timer_reduce(&rxnet->client_conn_reap_timer, reap_at);
+}
+
+/*
  * Disconnect a client call.
  */
 void rxrpc_disconnect_client_call(struct rxrpc_call *call)
@@ -813,6 +830,19 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call)
 		goto out_2;
 	}
 
+	/* Schedule the final ACK to be transmitted in a short while so that it
+	 * can be skipped if we find a follow-on call.  The first DATA packet
+	 * of the follow on call will implicitly ACK this call.
+	 */
+	if (test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
+		unsigned long final_ack_at = jiffies + 2;
+
+		WRITE_ONCE(chan->final_ack_at, final_ack_at);
+		smp_wmb(); /* vs rxrpc_process_delayed_final_acks() */
+		set_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags);
+		rxrpc_reduce_conn_timer(conn, final_ack_at);
+	}
+
 	/* Things are more complex and we need the cache lock.  We might be
 	 * able to simply idle the conn or it might now be lurking on the wait
 	 * list.  It might even get moved back to the active list whilst we're
@@ -878,9 +908,7 @@ idle_connection:
 		list_move_tail(&conn->cache_link, &rxnet->idle_client_conns);
 		if (rxnet->idle_client_conns.next == &conn->cache_link &&
 		    !rxnet->kill_all_client_conns)
-			queue_delayed_work(rxrpc_workqueue,
-					   &rxnet->client_conn_reaper,
-					   rxrpc_conn_idle_client_expiry);
+			rxrpc_set_client_reap_timer(rxnet);
 	} else {
 		trace_rxrpc_client(conn, channel, rxrpc_client_to_inactive);
 		conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;
@@ -1018,8 +1046,7 @@ void rxrpc_discard_expired_client_conns(struct work_struct *work)
 {
 	struct rxrpc_connection *conn;
 	struct rxrpc_net *rxnet =
-		container_of(to_delayed_work(work),
-			     struct rxrpc_net, client_conn_reaper);
+		container_of(work, struct rxrpc_net, client_conn_reaper);
 	unsigned long expiry, conn_expires_at, now;
 	unsigned int nr_conns;
 	bool did_discard = false;
@@ -1061,6 +1088,8 @@ next:
 		expiry = rxrpc_conn_idle_client_expiry;
 		if (nr_conns > rxrpc_reap_client_connections)
 			expiry = rxrpc_conn_idle_client_fast_expiry;
+		if (conn->params.local->service_closed)
+			expiry = rxrpc_closed_conn_expiry * HZ;
 
 		conn_expires_at = conn->idle_timestamp + expiry;
 
@@ -1096,9 +1125,8 @@ not_yet_expired:
 	 */
 	_debug("not yet");
 	if (!rxnet->kill_all_client_conns)
-		queue_delayed_work(rxrpc_workqueue,
-				   &rxnet->client_conn_reaper,
-				   conn_expires_at - now);
+		timer_reduce(&rxnet->client_conn_reap_timer,
+			     conn_expires_at);
 
 out:
 	spin_unlock(&rxnet->client_conn_cache_lock);
@@ -1118,9 +1146,9 @@ void rxrpc_destroy_all_client_connections(struct rxrpc_net *rxnet)
 	rxnet->kill_all_client_conns = true;
 	spin_unlock(&rxnet->client_conn_cache_lock);
 
-	cancel_delayed_work(&rxnet->client_conn_reaper);
+	del_timer_sync(&rxnet->client_conn_reap_timer);
 
-	if (!queue_delayed_work(rxrpc_workqueue, &rxnet->client_conn_reaper, 0))
+	if (!rxrpc_queue_work(&rxnet->client_conn_reaper))
 		_debug("destroy: queue failed");
 
 	_leave("");
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
index 59a51a56e7c8..9e9a8db1bc9c 100644
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -24,9 +24,10 @@
  * Retransmit terminal ACK or ABORT of the previous call.
  */
 static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
-				       struct sk_buff *skb)
+				       struct sk_buff *skb,
+				       unsigned int channel)
 {
-	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
 	struct rxrpc_channel *chan;
 	struct msghdr msg;
 	struct kvec iov;
@@ -48,7 +49,7 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
 
 	_enter("%d", conn->debug_id);
 
-	chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
+	chan = &conn->channels[channel];
 
 	/* If the last call got moved on whilst we were waiting to run, just
 	 * ignore this packet.
@@ -56,7 +57,7 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
 	call_id = READ_ONCE(chan->last_call);
 	/* Sync with __rxrpc_disconnect_call() */
 	smp_rmb();
-	if (call_id != sp->hdr.callNumber)
+	if (skb && call_id != sp->hdr.callNumber)
 		return;
 
 	msg.msg_name	= &conn->params.peer->srx.transport;
@@ -65,9 +66,9 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
 	msg.msg_controllen = 0;
 	msg.msg_flags	= 0;
 
-	pkt.whdr.epoch		= htonl(sp->hdr.epoch);
-	pkt.whdr.cid		= htonl(sp->hdr.cid);
-	pkt.whdr.callNumber	= htonl(sp->hdr.callNumber);
+	pkt.whdr.epoch		= htonl(conn->proto.epoch);
+	pkt.whdr.cid		= htonl(conn->proto.cid);
+	pkt.whdr.callNumber	= htonl(call_id);
 	pkt.whdr.seq		= 0;
 	pkt.whdr.type		= chan->last_type;
 	pkt.whdr.flags		= conn->out_clientflag;
@@ -87,11 +88,11 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
 		mtu = conn->params.peer->if_mtu;
 		mtu -= conn->params.peer->hdrsize;
 		pkt.ack.bufferSpace	= 0;
-		pkt.ack.maxSkew		= htons(skb->priority);
-		pkt.ack.firstPacket	= htonl(chan->last_seq);
-		pkt.ack.previousPacket	= htonl(chan->last_seq - 1);
-		pkt.ack.serial		= htonl(sp->hdr.serial);
-		pkt.ack.reason		= RXRPC_ACK_DUPLICATE;
+		pkt.ack.maxSkew		= htons(skb ? skb->priority : 0);
+		pkt.ack.firstPacket	= htonl(chan->last_seq + 1);
+		pkt.ack.previousPacket	= htonl(chan->last_seq);
+		pkt.ack.serial		= htonl(skb ? sp->hdr.serial : 0);
+		pkt.ack.reason		= skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
 		pkt.ack.nAcks		= 0;
 		pkt.info.rxMTU		= htonl(rxrpc_rx_mtu);
 		pkt.info.maxMTU		= htonl(mtu);
@@ -272,7 +273,8 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
 	switch (sp->hdr.type) {
 	case RXRPC_PACKET_TYPE_DATA:
 	case RXRPC_PACKET_TYPE_ACK:
-		rxrpc_conn_retransmit_call(conn, skb);
+		rxrpc_conn_retransmit_call(conn, skb,
+					   sp->hdr.cid & RXRPC_CHANNELMASK);
 		return 0;
 
 	case RXRPC_PACKET_TYPE_BUSY:
@@ -379,6 +381,48 @@ abort:
 }
 
 /*
+ * Process delayed final ACKs that we haven't subsumed into a subsequent call.
+ */
+static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
+{
+	unsigned long j = jiffies, next_j;
+	unsigned int channel;
+	bool set;
+
+again:
+	next_j = j + LONG_MAX;
+	set = false;
+	for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
+		struct rxrpc_channel *chan = &conn->channels[channel];
+		unsigned long ack_at;
+
+		if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
+			continue;
+
+		smp_rmb(); /* vs rxrpc_disconnect_client_call */
+		ack_at = READ_ONCE(chan->final_ack_at);
+
+		if (time_before(j, ack_at)) {
+			if (time_before(ack_at, next_j)) {
+				next_j = ack_at;
+				set = true;
+			}
+			continue;
+		}
+
+		if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
+				       &conn->flags))
+			rxrpc_conn_retransmit_call(conn, NULL, channel);
+	}
+
+	j = jiffies;
+	if (time_before_eq(next_j, j))
+		goto again;
+	if (set)
+		rxrpc_reduce_conn_timer(conn, next_j);
+}
+
+/*
  * connection-level event processor
  */
 void rxrpc_process_connection(struct work_struct *work)
@@ -394,6 +438,10 @@ void rxrpc_process_connection(struct work_struct *work)
 	if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
 		rxrpc_secure_connection(conn);
 
+	/* Process delayed ACKs whose time has come. */
+	if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
+		rxrpc_process_delayed_final_acks(conn);
+
 	/* go through the conn-level event packets, releasing the ref on this
 	 * connection that each one has when we've finished with it */
 	while ((skb = skb_dequeue(&conn->rx_queue))) {
diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index fe575798592f..1aad04a32d5e 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -20,10 +20,19 @@
 /*
  * Time till a connection expires after last use (in seconds).
  */
-unsigned int rxrpc_connection_expiry = 10 * 60;
+unsigned int __read_mostly rxrpc_connection_expiry = 10 * 60;
+unsigned int __read_mostly rxrpc_closed_conn_expiry = 10;
 
 static void rxrpc_destroy_connection(struct rcu_head *);
 
+static void rxrpc_connection_timer(struct timer_list *timer)
+{
+	struct rxrpc_connection *conn =
+		container_of(timer, struct rxrpc_connection, timer);
+
+	rxrpc_queue_conn(conn);
+}
+
 /*
  * allocate a new connection
  */
@@ -38,6 +47,7 @@ struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
 		INIT_LIST_HEAD(&conn->cache_link);
 		spin_lock_init(&conn->channel_lock);
 		INIT_LIST_HEAD(&conn->waiting_calls);
+		timer_setup(&conn->timer, &rxrpc_connection_timer, 0);
 		INIT_WORK(&conn->processor, &rxrpc_process_connection);
 		INIT_LIST_HEAD(&conn->proc_link);
 		INIT_LIST_HEAD(&conn->link);
@@ -301,21 +311,29 @@ rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
 }
 
 /*
+ * Set the service connection reap timer.
+ */
+static void rxrpc_set_service_reap_timer(struct rxrpc_net *rxnet,
+					 unsigned long reap_at)
+{
+	if (rxnet->live)
+		timer_reduce(&rxnet->service_conn_reap_timer, reap_at);
+}
+
+/*
  * Release a service connection
  */
 void rxrpc_put_service_conn(struct rxrpc_connection *conn)
 {
-	struct rxrpc_net *rxnet;
 	const void *here = __builtin_return_address(0);
 	int n;
 
 	n = atomic_dec_return(&conn->usage);
 	trace_rxrpc_conn(conn, rxrpc_conn_put_service, n, here);
 	ASSERTCMP(n, >=, 0);
-	if (n == 0) {
-		rxnet = conn->params.local->rxnet;
-		rxrpc_queue_delayed_work(&rxnet->service_conn_reaper, 0);
-	}
+	if (n == 1)
+		rxrpc_set_service_reap_timer(conn->params.local->rxnet,
+					     jiffies + rxrpc_connection_expiry);
 }
 
 /*
@@ -332,6 +350,7 @@ static void rxrpc_destroy_connection(struct rcu_head *rcu)
 
 	_net("DESTROY CONN %d", conn->debug_id);
 
+	del_timer_sync(&conn->timer);
 	rxrpc_purge_queue(&conn->rx_queue);
 
 	conn->security->clear(conn);
@@ -351,17 +370,15 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
 {
 	struct rxrpc_connection *conn, *_p;
 	struct rxrpc_net *rxnet =
-		container_of(to_delayed_work(work),
-			     struct rxrpc_net, service_conn_reaper);
-	unsigned long reap_older_than, earliest, idle_timestamp, now;
+		container_of(work, struct rxrpc_net, service_conn_reaper);
+	unsigned long expire_at, earliest, idle_timestamp, now;
 
 	LIST_HEAD(graveyard);
 
 	_enter("");
 
 	now = jiffies;
-	reap_older_than = now - rxrpc_connection_expiry * HZ;
-	earliest = ULONG_MAX;
+	earliest = now + MAX_JIFFY_OFFSET;
 
 	write_lock(&rxnet->conn_lock);
 	list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
@@ -371,15 +388,21 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
 		if (conn->state == RXRPC_CONN_SERVICE_PREALLOC)
 			continue;
 
-		idle_timestamp = READ_ONCE(conn->idle_timestamp);
-		_debug("reap CONN %d { u=%d,t=%ld }",
-		       conn->debug_id, atomic_read(&conn->usage),
-		       (long)reap_older_than - (long)idle_timestamp);
-
-		if (time_after(idle_timestamp, reap_older_than)) {
-			if (time_before(idle_timestamp, earliest))
-				earliest = idle_timestamp;
-			continue;
+		if (rxnet->live) {
+			idle_timestamp = READ_ONCE(conn->idle_timestamp);
+			expire_at = idle_timestamp + rxrpc_connection_expiry * HZ;
+			if (conn->params.local->service_closed)
+				expire_at = idle_timestamp + rxrpc_closed_conn_expiry * HZ;
+
+			_debug("reap CONN %d { u=%d,t=%ld }",
+			       conn->debug_id, atomic_read(&conn->usage),
+			       (long)expire_at - (long)now);
+
+			if (time_before(now, expire_at)) {
+				if (time_before(expire_at, earliest))
+					earliest = expire_at;
+				continue;
+			}
 		}
 
 		/* The usage count sits at 1 whilst the object is unused on the
@@ -387,6 +410,7 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
 		 */
 		if (atomic_cmpxchg(&conn->usage, 1, 0) != 1)
 			continue;
+		trace_rxrpc_conn(conn, rxrpc_conn_reap_service, 0, 0);
 
 		if (rxrpc_conn_is_client(conn))
 			BUG();
@@ -397,11 +421,10 @@ void rxrpc_service_connection_reaper(struct work_struct *work)
 	}
 	write_unlock(&rxnet->conn_lock);
 
-	if (earliest != ULONG_MAX) {
-		_debug("reschedule reaper %ld", (long) earliest - now);
+	if (earliest != now + MAX_JIFFY_OFFSET) {
+		_debug("reschedule reaper %ld", (long)earliest - (long)now);
 		ASSERT(time_after(earliest, now));
-		rxrpc_queue_delayed_work(&rxnet->client_conn_reaper,
-					 earliest - now);
+		rxrpc_set_service_reap_timer(rxnet, earliest);		
 	}
 
 	while (!list_empty(&graveyard)) {
@@ -429,9 +452,8 @@ void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
 
 	rxrpc_destroy_all_client_connections(rxnet);
 
-	rxrpc_connection_expiry = 0;
-	cancel_delayed_work(&rxnet->client_conn_reaper);
-	rxrpc_queue_delayed_work(&rxnet->client_conn_reaper, 0);
+	del_timer_sync(&rxnet->service_conn_reap_timer);
+	rxrpc_queue_work(&rxnet->service_conn_reaper);
 	flush_workqueue(rxrpc_workqueue);
 
 	write_lock(&rxnet->conn_lock);
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 1b592073ec96..23a5e61d8f79 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -318,16 +318,18 @@ bad_state:
 static bool rxrpc_receiving_reply(struct rxrpc_call *call)
 {
 	struct rxrpc_ack_summary summary = { 0 };
+	unsigned long now, timo;
 	rxrpc_seq_t top = READ_ONCE(call->tx_top);
 
 	if (call->ackr_reason) {
 		spin_lock_bh(&call->lock);
 		call->ackr_reason = 0;
-		call->resend_at = call->expire_at;
-		call->ack_at = call->expire_at;
 		spin_unlock_bh(&call->lock);
-		rxrpc_set_timer(call, rxrpc_timer_init_for_reply,
-				ktime_get_real());
+		now = jiffies;
+		timo = now + MAX_JIFFY_OFFSET;
+		WRITE_ONCE(call->resend_at, timo);
+		WRITE_ONCE(call->ack_at, timo);
+		trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now);
 	}
 
 	if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags))
@@ -437,6 +439,19 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb,
 	if (state >= RXRPC_CALL_COMPLETE)
 		return;
 
+	if (call->state == RXRPC_CALL_SERVER_RECV_REQUEST) {
+		unsigned long timo = READ_ONCE(call->next_req_timo);
+		unsigned long now, expect_req_by;
+
+		if (timo) {
+			now = jiffies;
+			expect_req_by = now + timo;
+			WRITE_ONCE(call->expect_req_by, expect_req_by);
+			rxrpc_reduce_call_timer(call, expect_req_by, now,
+						rxrpc_timer_set_for_idle);
+		}
+	}
+
 	/* Received data implicitly ACKs all of the request packets we sent
 	 * when we're acting as a client.
 	 */
@@ -616,6 +631,43 @@ found:
 }
 
 /*
+ * Process the response to a ping that we sent to find out if we lost an ACK.
+ *
+ * If we got back a ping response that indicates a lower tx_top than what we
+ * had at the time of the ping transmission, we adjudge all the DATA packets
+ * sent between the response tx_top and the ping-time tx_top to have been lost.
+ */
+static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call)
+{
+	rxrpc_seq_t top, bottom, seq;
+	bool resend = false;
+
+	spin_lock_bh(&call->lock);
+
+	bottom = call->tx_hard_ack + 1;
+	top = call->acks_lost_top;
+	if (before(bottom, top)) {
+		for (seq = bottom; before_eq(seq, top); seq++) {
+			int ix = seq & RXRPC_RXTX_BUFF_MASK;
+			u8 annotation = call->rxtx_annotations[ix];
+			u8 anno_type = annotation & RXRPC_TX_ANNO_MASK;
+
+			if (anno_type != RXRPC_TX_ANNO_UNACK)
+				continue;
+			annotation &= ~RXRPC_TX_ANNO_MASK;
+			annotation |= RXRPC_TX_ANNO_RETRANS;
+			call->rxtx_annotations[ix] = annotation;
+			resend = true;
+		}
+	}
+
+	spin_unlock_bh(&call->lock);
+
+	if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
+		rxrpc_queue_call(call);
+}
+
+/*
  * Process a ping response.
  */
 static void rxrpc_input_ping_response(struct rxrpc_call *call,
@@ -630,6 +682,9 @@ static void rxrpc_input_ping_response(struct rxrpc_call *call,
 	smp_rmb();
 	ping_serial = call->ping_serial;
 
+	if (orig_serial == call->acks_lost_ping)
+		rxrpc_input_check_for_lost_ack(call);
+
 	if (!test_bit(RXRPC_CALL_PINGING, &call->flags) ||
 	    before(orig_serial, ping_serial))
 		return;
@@ -908,9 +963,20 @@ static void rxrpc_input_call_packet(struct rxrpc_call *call,
 				    struct sk_buff *skb, u16 skew)
 {
 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	unsigned long timo;
 
 	_enter("%p,%p", call, skb);
 
+	timo = READ_ONCE(call->next_rx_timo);
+	if (timo) {
+		unsigned long now = jiffies, expect_rx_by;
+
+		expect_rx_by = jiffies + timo;
+		WRITE_ONCE(call->expect_rx_by, expect_rx_by);
+		rxrpc_reduce_call_timer(call, expect_rx_by, now,
+					rxrpc_timer_set_for_normal);
+	}
+	
 	switch (sp->hdr.type) {
 	case RXRPC_PACKET_TYPE_DATA:
 		rxrpc_input_data(call, skb, skew);
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index 1a2d4b112064..c1d9e7fd7448 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -21,33 +21,28 @@
 unsigned int rxrpc_max_backlog __read_mostly = 10;
 
 /*
- * Maximum lifetime of a call (in mx).
- */
-unsigned int rxrpc_max_call_lifetime = 60 * 1000;
-
-/*
  * How long to wait before scheduling ACK generation after seeing a
- * packet with RXRPC_REQUEST_ACK set (in ms).
+ * packet with RXRPC_REQUEST_ACK set (in jiffies).
  */
-unsigned int rxrpc_requested_ack_delay = 1;
+unsigned long rxrpc_requested_ack_delay = 1;
 
 /*
- * How long to wait before scheduling an ACK with subtype DELAY (in ms).
+ * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
  *
  * We use this when we've received new data packets.  If those packets aren't
  * all consumed within this time we will send a DELAY ACK if an ACK was not
  * requested to let the sender know it doesn't need to resend.
  */
-unsigned int rxrpc_soft_ack_delay = 1 * 1000;
+unsigned long rxrpc_soft_ack_delay = HZ;
 
 /*
- * How long to wait before scheduling an ACK with subtype IDLE (in ms).
+ * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
  *
  * We use this when we've consumed some previously soft-ACK'd packets when
  * further packets aren't immediately received to decide when to send an IDLE
  * ACK let the other end know that it can free up its Tx buffer space.
  */
-unsigned int rxrpc_idle_ack_delay = 0.5 * 1000;
+unsigned long rxrpc_idle_ack_delay = HZ / 2;
 
 /*
  * Receive window size in packets.  This indicates the maximum number of
@@ -75,7 +70,7 @@ unsigned int rxrpc_rx_jumbo_max = 4;
 /*
  * Time till packet resend (in milliseconds).
  */
-unsigned int rxrpc_resend_timeout = 4 * 1000;
+unsigned long rxrpc_resend_timeout = 4 * HZ;
 
 const s8 rxrpc_ack_priority[] = {
 	[0]				= 0,
diff --git a/net/rxrpc/net_ns.c b/net/rxrpc/net_ns.c
index 7edceb8522f5..f18c9248e0d4 100644
--- a/net/rxrpc/net_ns.c
+++ b/net/rxrpc/net_ns.c
@@ -14,6 +14,24 @@
 
 unsigned int rxrpc_net_id;
 
+static void rxrpc_client_conn_reap_timeout(struct timer_list *timer)
+{
+	struct rxrpc_net *rxnet =
+		container_of(timer, struct rxrpc_net, client_conn_reap_timer);
+
+	if (rxnet->live)
+		rxrpc_queue_work(&rxnet->client_conn_reaper);
+}
+
+static void rxrpc_service_conn_reap_timeout(struct timer_list *timer)
+{
+	struct rxrpc_net *rxnet =
+		container_of(timer, struct rxrpc_net, service_conn_reap_timer);
+
+	if (rxnet->live)
+		rxrpc_queue_work(&rxnet->service_conn_reaper);
+}
+
 /*
  * Initialise a per-network namespace record.
  */
@@ -22,6 +40,7 @@ static __net_init int rxrpc_init_net(struct net *net)
 	struct rxrpc_net *rxnet = rxrpc_net(net);
 	int ret;
 
+	rxnet->live = true;
 	get_random_bytes(&rxnet->epoch, sizeof(rxnet->epoch));
 	rxnet->epoch |= RXRPC_RANDOM_EPOCH;
 
@@ -31,8 +50,10 @@ static __net_init int rxrpc_init_net(struct net *net)
 	INIT_LIST_HEAD(&rxnet->conn_proc_list);
 	INIT_LIST_HEAD(&rxnet->service_conns);
 	rwlock_init(&rxnet->conn_lock);
-	INIT_DELAYED_WORK(&rxnet->service_conn_reaper,
-			  rxrpc_service_connection_reaper);
+	INIT_WORK(&rxnet->service_conn_reaper,
+		  rxrpc_service_connection_reaper);
+	timer_setup(&rxnet->service_conn_reap_timer,
+		    rxrpc_service_conn_reap_timeout, 0);
 
 	rxnet->nr_client_conns = 0;
 	rxnet->nr_active_client_conns = 0;
@@ -42,8 +63,10 @@ static __net_init int rxrpc_init_net(struct net *net)
 	INIT_LIST_HEAD(&rxnet->waiting_client_conns);
 	INIT_LIST_HEAD(&rxnet->active_client_conns);
 	INIT_LIST_HEAD(&rxnet->idle_client_conns);
-	INIT_DELAYED_WORK(&rxnet->client_conn_reaper,
-			  rxrpc_discard_expired_client_conns);
+	INIT_WORK(&rxnet->client_conn_reaper,
+		  rxrpc_discard_expired_client_conns);
+	timer_setup(&rxnet->client_conn_reap_timer,
+		    rxrpc_client_conn_reap_timeout, 0);
 
 	INIT_LIST_HEAD(&rxnet->local_endpoints);
 	mutex_init(&rxnet->local_mutex);
@@ -60,6 +83,7 @@ static __net_init int rxrpc_init_net(struct net *net)
 	return 0;
 
 err_proc:
+	rxnet->live = false;
 	return ret;
 }
 
@@ -70,6 +94,7 @@ static __net_exit void rxrpc_exit_net(struct net *net)
 {
 	struct rxrpc_net *rxnet = rxrpc_net(net);
 
+	rxnet->live = false;
 	rxrpc_destroy_all_calls(rxnet);
 	rxrpc_destroy_all_connections(rxnet);
 	rxrpc_destroy_all_locals(rxnet);
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index f47659c7b224..42410e910aff 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -33,6 +33,24 @@ struct rxrpc_abort_buffer {
 };
 
 /*
+ * Arrange for a keepalive ping a certain time after we last transmitted.  This
+ * lets the far side know we're still interested in this call and helps keep
+ * the route through any intervening firewall open.
+ *
+ * Receiving a response to the ping will prevent the ->expect_rx_by timer from
+ * expiring.
+ */
+static void rxrpc_set_keepalive(struct rxrpc_call *call)
+{
+	unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6;
+
+	keepalive_at += now;
+	WRITE_ONCE(call->keepalive_at, keepalive_at);
+	rxrpc_reduce_call_timer(call, keepalive_at, now,
+				rxrpc_timer_set_for_keepalive);
+}
+
+/*
  * Fill out an ACK packet.
  */
 static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
@@ -95,7 +113,8 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
 /*
  * Send an ACK call packet.
  */
-int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping)
+int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
+			  rxrpc_serial_t *_serial)
 {
 	struct rxrpc_connection *conn = NULL;
 	struct rxrpc_ack_buffer *pkt;
@@ -165,6 +184,8 @@ int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping)
 			   ntohl(pkt->ack.firstPacket),
 			   ntohl(pkt->ack.serial),
 			   pkt->ack.reason, pkt->ack.nAcks);
+	if (_serial)
+		*_serial = serial;
 
 	if (ping) {
 		call->ping_serial = serial;
@@ -202,6 +223,8 @@ int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping)
 				call->ackr_seen = top;
 			spin_unlock_bh(&call->lock);
 		}
+
+		rxrpc_set_keepalive(call);
 	}
 
 out:
@@ -323,7 +346,8 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
 	 * ACKs if a DATA packet appears to have been lost.
 	 */
 	if (!(sp->hdr.flags & RXRPC_LAST_PACKET) &&
-	    (retrans ||
+	    (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) ||
+	     retrans ||
 	     call->cong_mode == RXRPC_CALL_SLOW_START ||
 	     (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) ||
 	     ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000),
@@ -370,8 +394,23 @@ done:
 		if (whdr.flags & RXRPC_REQUEST_ACK) {
 			call->peer->rtt_last_req = now;
 			trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial);
+			if (call->peer->rtt_usage > 1) {
+				unsigned long nowj = jiffies, ack_lost_at;
+
+				ack_lost_at = nsecs_to_jiffies(2 * call->peer->rtt);
+				if (ack_lost_at < 1)
+					ack_lost_at = 1;
+
+				ack_lost_at += nowj;
+				WRITE_ONCE(call->ack_lost_at, ack_lost_at);
+				rxrpc_reduce_call_timer(call, ack_lost_at, nowj,
+							rxrpc_timer_set_for_lost_ack);
+			}
 		}
 	}
+
+	rxrpc_set_keepalive(call);
+
 	_leave(" = %d [%u]", ret, call->peer->maxdata);
 	return ret;
 
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 8510a98b87e1..cc21e8db25b0 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -144,11 +144,13 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call, rxrpc_serial_t serial)
 	trace_rxrpc_receive(call, rxrpc_receive_end, 0, call->rx_top);
 	ASSERTCMP(call->rx_hard_ack, ==, call->rx_top);
 
+#if 0 // TODO: May want to transmit final ACK under some circumstances anyway
 	if (call->state == RXRPC_CALL_CLIENT_RECV_REPLY) {
 		rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, serial, true, false,
 				  rxrpc_propose_ack_terminal_ack);
-		rxrpc_send_ack_packet(call, false);
+		rxrpc_send_ack_packet(call, false, NULL);
 	}
+#endif
 
 	write_lock_bh(&call->state_lock);
 
@@ -161,7 +163,7 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call, rxrpc_serial_t serial)
 	case RXRPC_CALL_SERVER_RECV_REQUEST:
 		call->tx_phase = true;
 		call->state = RXRPC_CALL_SERVER_ACK_REQUEST;
-		call->ack_at = call->expire_at;
+		call->expect_req_by = jiffies + MAX_JIFFY_OFFSET;
 		write_unlock_bh(&call->state_lock);
 		rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, 0, serial, false, true,
 				  rxrpc_propose_ack_processing_op);
@@ -217,10 +219,10 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
 		    after_eq(top, call->ackr_seen + 2) ||
 		    (hard_ack == top && after(hard_ack, call->ackr_consumed)))
 			rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, 0, serial,
-					  true, false,
+					  true, true,
 					  rxrpc_propose_ack_rotate_rx);
-		if (call->ackr_reason)
-			rxrpc_send_ack_packet(call, false);
+		if (call->ackr_reason && call->ackr_reason != RXRPC_ACK_DELAY)
+			rxrpc_send_ack_packet(call, false, NULL);
 	}
 }
 
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 7d2595582c09..a1c53ac066a1 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -21,22 +21,6 @@
 #include <net/af_rxrpc.h>
 #include "ar-internal.h"
 
-enum rxrpc_command {
-	RXRPC_CMD_SEND_DATA,		/* send data message */
-	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
-	RXRPC_CMD_ACCEPT,		/* [server] accept incoming call */
-	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
-};
-
-struct rxrpc_send_params {
-	s64			tx_total_len;	/* Total Tx data length (if send data) */
-	unsigned long		user_call_ID;	/* User's call ID */
-	u32			abort_code;	/* Abort code to Tx (if abort) */
-	enum rxrpc_command	command : 8;	/* The command to implement */
-	bool			exclusive;	/* Shared or exclusive call */
-	bool			upgrade;	/* If the connection is upgradeable */
-};
-
 /*
  * Wait for space to appear in the Tx queue or a signal to occur.
  */
@@ -174,6 +158,7 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
 			       rxrpc_notify_end_tx_t notify_end_tx)
 {
 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	unsigned long now;
 	rxrpc_seq_t seq = sp->hdr.seq;
 	int ret, ix;
 	u8 annotation = RXRPC_TX_ANNO_UNACK;
@@ -213,11 +198,11 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
 			break;
 		case RXRPC_CALL_SERVER_ACK_REQUEST:
 			call->state = RXRPC_CALL_SERVER_SEND_REPLY;
-			call->ack_at = call->expire_at;
+			now = jiffies;
+			WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET);
 			if (call->ackr_reason == RXRPC_ACK_DELAY)
 				call->ackr_reason = 0;
-			__rxrpc_set_timer(call, rxrpc_timer_init_for_send_reply,
-					  ktime_get_real());
+			trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
 			if (!last)
 				break;
 			/* Fall through */
@@ -239,14 +224,19 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
 		_debug("need instant resend %d", ret);
 		rxrpc_instant_resend(call, ix);
 	} else {
-		ktime_t now = ktime_get_real(), resend_at;
-
-		resend_at = ktime_add_ms(now, rxrpc_resend_timeout);
-
-		if (ktime_before(resend_at, call->resend_at)) {
-			call->resend_at = resend_at;
-			rxrpc_set_timer(call, rxrpc_timer_set_for_send, now);
-		}
+		unsigned long now = jiffies, resend_at;
+
+		if (call->peer->rtt_usage > 1)
+			resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2);
+		else
+			resend_at = rxrpc_resend_timeout;
+		if (resend_at < 1)
+			resend_at = 1;
+
+		resend_at = now + rxrpc_resend_timeout;
+		WRITE_ONCE(call->resend_at, resend_at);
+		rxrpc_reduce_call_timer(call, resend_at, now,
+					rxrpc_timer_set_for_send);
 	}
 
 	rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
@@ -295,7 +285,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
 	do {
 		/* Check to see if there's a ping ACK to reply to. */
 		if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
-			rxrpc_send_ack_packet(call, false);
+			rxrpc_send_ack_packet(call, false, NULL);
 
 		if (!skb) {
 			size_t size, chunk, max, space;
@@ -480,11 +470,11 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
 			if (msg->msg_flags & MSG_CMSG_COMPAT) {
 				if (len != sizeof(u32))
 					return -EINVAL;
-				p->user_call_ID = *(u32 *)CMSG_DATA(cmsg);
+				p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
 			} else {
 				if (len != sizeof(unsigned long))
 					return -EINVAL;
-				p->user_call_ID = *(unsigned long *)
+				p->call.user_call_ID = *(unsigned long *)
 					CMSG_DATA(cmsg);
 			}
 			got_user_ID = true;
@@ -522,11 +512,24 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
 			break;
 
 		case RXRPC_TX_LENGTH:
-			if (p->tx_total_len != -1 || len != sizeof(__s64))
+			if (p->call.tx_total_len != -1 || len != sizeof(__s64))
+				return -EINVAL;
+			p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
+			if (p->call.tx_total_len < 0)
 				return -EINVAL;
-			p->tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
-			if (p->tx_total_len < 0)
+			break;
+
+		case RXRPC_SET_CALL_TIMEOUT:
+			if (len & 3 || len < 4 || len > 12)
 				return -EINVAL;
+			memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
+			p->call.nr_timeouts = len / 4;
+			if (p->call.timeouts.hard > INT_MAX / HZ)
+				return -ERANGE;
+			if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
+				return -ERANGE;
+			if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
+				return -ERANGE;
 			break;
 
 		default:
@@ -536,7 +539,7 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
 
 	if (!got_user_ID)
 		return -EINVAL;
-	if (p->tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
+	if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
 		return -EINVAL;
 	_leave(" = 0");
 	return 0;
@@ -576,8 +579,7 @@ rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
 	cp.exclusive		= rx->exclusive | p->exclusive;
 	cp.upgrade		= p->upgrade;
 	cp.service_id		= srx->srx_service;
-	call = rxrpc_new_client_call(rx, &cp, srx, p->user_call_ID,
-				     p->tx_total_len, GFP_KERNEL);
+	call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL);
 	/* The socket is now unlocked */
 
 	_leave(" = %p\n", call);
@@ -594,15 +596,17 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
 {
 	enum rxrpc_call_state state;
 	struct rxrpc_call *call;
+	unsigned long now, j;
 	int ret;
 
 	struct rxrpc_send_params p = {
-		.tx_total_len	= -1,
-		.user_call_ID	= 0,
-		.abort_code	= 0,
-		.command	= RXRPC_CMD_SEND_DATA,
-		.exclusive	= false,
-		.upgrade	= true,
+		.call.tx_total_len	= -1,
+		.call.user_call_ID	= 0,
+		.call.nr_timeouts	= 0,
+		.abort_code		= 0,
+		.command		= RXRPC_CMD_SEND_DATA,
+		.exclusive		= false,
+		.upgrade		= false,
 	};
 
 	_enter("");
@@ -615,15 +619,15 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
 		ret = -EINVAL;
 		if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
 			goto error_release_sock;
-		call = rxrpc_accept_call(rx, p.user_call_ID, NULL);
+		call = rxrpc_accept_call(rx, p.call.user_call_ID, NULL);
 		/* The socket is now unlocked. */
 		if (IS_ERR(call))
 			return PTR_ERR(call);
-		rxrpc_put_call(call, rxrpc_call_put);
-		return 0;
+		ret = 0;
+		goto out_put_unlock;
 	}
 
-	call = rxrpc_find_call_by_user_ID(rx, p.user_call_ID);
+	call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
 	if (!call) {
 		ret = -EBADSLT;
 		if (p.command != RXRPC_CMD_SEND_DATA)
@@ -653,14 +657,39 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
 			goto error_put;
 		}
 
-		if (p.tx_total_len != -1) {
+		if (p.call.tx_total_len != -1) {
 			ret = -EINVAL;
 			if (call->tx_total_len != -1 ||
 			    call->tx_pending ||
 			    call->tx_top != 0)
 				goto error_put;
-			call->tx_total_len = p.tx_total_len;
+			call->tx_total_len = p.call.tx_total_len;
+		}
+	}
+
+	switch (p.call.nr_timeouts) {
+	case 3:
+		j = msecs_to_jiffies(p.call.timeouts.normal);
+		if (p.call.timeouts.normal > 0 && j == 0)
+			j = 1;
+		WRITE_ONCE(call->next_rx_timo, j);
+		/* Fall through */
+	case 2:
+		j = msecs_to_jiffies(p.call.timeouts.idle);
+		if (p.call.timeouts.idle > 0 && j == 0)
+			j = 1;
+		WRITE_ONCE(call->next_req_timo, j);
+		/* Fall through */
+	case 1:
+		if (p.call.timeouts.hard > 0) {
+			j = msecs_to_jiffies(p.call.timeouts.hard);
+			now = jiffies;
+			j += now;
+			WRITE_ONCE(call->expect_term_by, j);
+			rxrpc_reduce_call_timer(call, j, now,
+						rxrpc_timer_set_for_hard);
 		}
+		break;
 	}
 
 	state = READ_ONCE(call->state);
@@ -689,6 +718,7 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
 		ret = rxrpc_send_data(rx, call, msg, len, NULL);
 	}
 
+out_put_unlock:
 	mutex_unlock(&call->user_mutex);
 error_put:
 	rxrpc_put_call(call, rxrpc_call_put);
diff --git a/net/rxrpc/sysctl.c b/net/rxrpc/sysctl.c
index 34c706d2f79c..4a7af7aff37d 100644
--- a/net/rxrpc/sysctl.c
+++ b/net/rxrpc/sysctl.c
@@ -21,6 +21,8 @@ static const unsigned int four = 4;
 static const unsigned int thirtytwo = 32;
 static const unsigned int n_65535 = 65535;
 static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;
+static const unsigned long one_jiffy = 1;
+static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;
 
 /*
  * RxRPC operating parameters.
@@ -29,64 +31,60 @@ static const unsigned int n_max_acks = RXRPC_RXTX_BUFF_SIZE - 1;
  * information on the individual parameters.
  */
 static struct ctl_table rxrpc_sysctl_table[] = {
-	/* Values measured in milliseconds */
+	/* Values measured in milliseconds but used in jiffies */
 	{
 		.procname	= "req_ack_delay",
 		.data		= &rxrpc_requested_ack_delay,
-		.maxlen		= sizeof(unsigned int),
+		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-		.extra1		= (void *)&zero,
+		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
+		.extra1		= (void *)&one_jiffy,
+		.extra2		= (void *)&max_jiffies,
 	},
 	{
 		.procname	= "soft_ack_delay",
 		.data		= &rxrpc_soft_ack_delay,
-		.maxlen		= sizeof(unsigned int),
+		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-		.extra1		= (void *)&one,
+		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
+		.extra1		= (void *)&one_jiffy,
+		.extra2		= (void *)&max_jiffies,
 	},
 	{
 		.procname	= "idle_ack_delay",
 		.data		= &rxrpc_idle_ack_delay,
-		.maxlen		= sizeof(unsigned int),
+		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-		.extra1		= (void *)&one,
-	},
-	{
-		.procname	= "resend_timeout",
-		.data		= &rxrpc_resend_timeout,
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-		.extra1		= (void *)&one,
+		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
+		.extra1		= (void *)&one_jiffy,
+		.extra2		= (void *)&max_jiffies,
 	},
 	{
 		.procname	= "idle_conn_expiry",
 		.data		= &rxrpc_conn_idle_client_expiry,
-		.maxlen		= sizeof(unsigned int),
+		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec_ms_jiffies,
-		.extra1		= (void *)&one,
+		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
+		.extra1		= (void *)&one_jiffy,
+		.extra2		= (void *)&max_jiffies,
 	},
 	{
 		.procname	= "idle_conn_fast_expiry",
 		.data		= &rxrpc_conn_idle_client_fast_expiry,
-		.maxlen		= sizeof(unsigned int),
+		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec_ms_jiffies,
-		.extra1		= (void *)&one,
+		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
+		.extra1		= (void *)&one_jiffy,
+		.extra2		= (void *)&max_jiffies,
 	},
-
-	/* Values measured in seconds but used in jiffies */
 	{
-		.procname	= "max_call_lifetime",
-		.data		= &rxrpc_max_call_lifetime,
-		.maxlen		= sizeof(unsigned int),
+		.procname	= "resend_timeout",
+		.data		= &rxrpc_resend_timeout,
+		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-		.extra1		= (void *)&one,
+		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
+		.extra1		= (void *)&one_jiffy,
+		.extra2		= (void *)&max_jiffies,
 	},
 
 	/* Non-time values */