[PATCH net-next 18/21] rxrpc: Use ktimes for call timeout tracking and set the timer lazily

[David Howells <dhowells@redhat.com>]

Track the call timeouts as ktimes rather than jiffies as the latter's
granularity is too high and only set the timer at the end of the event
handling function.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
---
 include/trace/events/rxrpc.h | 174 +++++++++++++++++---------------
 net/rxrpc/af_rxrpc.c         |  12 +--
 net/rxrpc/ar-internal.h      |  35 +++----
 net/rxrpc/call_event.c       | 189 +++++++++++++++++------------------
 net/rxrpc/call_object.c      |  56 +++++------
 net/rxrpc/input.c            |  28 +++---
 net/rxrpc/misc.c             |   8 +-
 net/rxrpc/output.c           |  40 +++-----
 net/rxrpc/proc.c             |  10 +-
 net/rxrpc/rtt.c              |  36 +++----
 net/rxrpc/sendmsg.c          |  25 ++---
 net/rxrpc/sysctl.c           |  16 +--
 12 files changed, 307 insertions(+), 322 deletions(-)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 3b726a6c8c42..de3663280ee4 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -119,6 +119,7 @@
 	EM(rxrpc_call_poke_complete,		"Compl")	\
 	EM(rxrpc_call_poke_error,		"Error")	\
 	EM(rxrpc_call_poke_idle,		"Idle")		\
+	EM(rxrpc_call_poke_set_timeout,		"Set-timo")	\
 	EM(rxrpc_call_poke_start,		"Start")	\
 	EM(rxrpc_call_poke_timer,		"Timer")	\
 	E_(rxrpc_call_poke_timer_now,		"Timer-now")
@@ -340,27 +341,16 @@
 	E_(rxrpc_rtt_rx_requested_ack,		"RACK")
 
 #define rxrpc_timer_traces \
-	EM(rxrpc_timer_begin,			"Begin ") \
-	EM(rxrpc_timer_exp_ack,			"ExpAck") \
-	EM(rxrpc_timer_exp_hard,		"ExpHrd") \
-	EM(rxrpc_timer_exp_idle,		"ExpIdl") \
-	EM(rxrpc_timer_exp_keepalive,		"ExpKA ") \
-	EM(rxrpc_timer_exp_lost_ack,		"ExpLoA") \
-	EM(rxrpc_timer_exp_normal,		"ExpNml") \
-	EM(rxrpc_timer_exp_ping,		"ExpPng") \
-	EM(rxrpc_timer_exp_resend,		"ExpRsn") \
-	EM(rxrpc_timer_init_for_reply,		"IniRpl") \
-	EM(rxrpc_timer_init_for_send_reply,	"SndRpl") \
-	EM(rxrpc_timer_restart,			"Restrt") \
-	EM(rxrpc_timer_set_for_ack,		"SetAck") \
-	EM(rxrpc_timer_set_for_hard,		"SetHrd") \
-	EM(rxrpc_timer_set_for_idle,		"SetIdl") \
-	EM(rxrpc_timer_set_for_keepalive,	"KeepAl") \
-	EM(rxrpc_timer_set_for_lost_ack,	"SetLoA") \
-	EM(rxrpc_timer_set_for_normal,		"SetNml") \
-	EM(rxrpc_timer_set_for_ping,		"SetPng") \
-	EM(rxrpc_timer_set_for_resend,		"SetRTx") \
-	E_(rxrpc_timer_set_for_send,		"SetSnd")
+	EM(rxrpc_timer_trace_delayed_ack,	"DelayAck ") \
+	EM(rxrpc_timer_trace_expect_rx,		"ExpectRx ") \
+	EM(rxrpc_timer_trace_hard,		"HardLimit") \
+	EM(rxrpc_timer_trace_idle,		"IdleLimit") \
+	EM(rxrpc_timer_trace_keepalive,		"KeepAlive") \
+	EM(rxrpc_timer_trace_lost_ack,		"LostAck  ") \
+	EM(rxrpc_timer_trace_ping,		"DelayPing") \
+	EM(rxrpc_timer_trace_resend,		"Resend   ") \
+	EM(rxrpc_timer_trace_resend_reset,	"ResendRst") \
+	E_(rxrpc_timer_trace_resend_tx,		"ResendTx ")
 
 #define rxrpc_propose_ack_traces \
 	EM(rxrpc_propose_ack_client_tx_end,	"ClTxEnd") \
@@ -1314,90 +1304,112 @@ TRACE_EVENT(rxrpc_rtt_rx,
 		      __entry->rto)
 	    );
 
-TRACE_EVENT(rxrpc_timer,
-	    TP_PROTO(struct rxrpc_call *call, enum rxrpc_timer_trace why,
-		     unsigned long now),
+TRACE_EVENT(rxrpc_timer_set,
+	    TP_PROTO(struct rxrpc_call *call, ktime_t delay,
+		     enum rxrpc_timer_trace why),
 
-	    TP_ARGS(call, why, now),
+	    TP_ARGS(call, delay, why),
 
 	    TP_STRUCT__entry(
 		    __field(unsigned int,		call)
 		    __field(enum rxrpc_timer_trace,	why)
-		    __field(long,			now)
-		    __field(long,			ack_at)
-		    __field(long,			ack_lost_at)
-		    __field(long,			resend_at)
-		    __field(long,			ping_at)
-		    __field(long,			expect_rx_by)
-		    __field(long,			expect_req_by)
-		    __field(long,			expect_term_by)
-		    __field(long,			timer)
+		    __field(ktime_t,			delay)
 			     ),
 
 	    TP_fast_assign(
 		    __entry->call		= call->debug_id;
 		    __entry->why		= why;
-		    __entry->now		= now;
-		    __entry->ack_at		= call->delay_ack_at;
-		    __entry->ack_lost_at	= call->ack_lost_at;
-		    __entry->resend_at		= call->resend_at;
-		    __entry->expect_rx_by	= call->expect_rx_by;
-		    __entry->expect_req_by	= call->expect_req_by;
-		    __entry->expect_term_by	= call->expect_term_by;
-		    __entry->timer		= call->timer.expires;
+		    __entry->delay		= delay;
 			   ),
 
-	    TP_printk("c=%08x %s a=%ld la=%ld r=%ld xr=%ld xq=%ld xt=%ld t=%ld",
+	    TP_printk("c=%08x %s to=%lld",
 		      __entry->call,
 		      __print_symbolic(__entry->why, rxrpc_timer_traces),
-		      __entry->ack_at - __entry->now,
-		      __entry->ack_lost_at - __entry->now,
-		      __entry->resend_at - __entry->now,
-		      __entry->expect_rx_by - __entry->now,
-		      __entry->expect_req_by - __entry->now,
-		      __entry->expect_term_by - __entry->now,
-		      __entry->timer - __entry->now)
+		      (long long)__entry->delay / 1000)
+	    );
+
+TRACE_EVENT(rxrpc_timer_exp,
+	    TP_PROTO(struct rxrpc_call *call, ktime_t delay,
+		     enum rxrpc_timer_trace why),
+
+	    TP_ARGS(call, delay, why),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned int,		call)
+		    __field(enum rxrpc_timer_trace,	why)
+		    __field(ktime_t,			delay)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->call		= call->debug_id;
+		    __entry->why		= why;
+		    __entry->delay		= delay;
+			   ),
+
+	    TP_printk("c=%08x %s to=%lld",
+		      __entry->call,
+		      __print_symbolic(__entry->why, rxrpc_timer_traces),
+		      (long long)__entry->delay / 1000)
+	    );
+
+TRACE_EVENT(rxrpc_timer_can,
+	    TP_PROTO(struct rxrpc_call *call, enum rxrpc_timer_trace why),
+
+	    TP_ARGS(call, why),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned int,		call)
+		    __field(enum rxrpc_timer_trace,	why)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->call		= call->debug_id;
+		    __entry->why		= why;
+			   ),
+
+	    TP_printk("c=%08x %s",
+		      __entry->call,
+		      __print_symbolic(__entry->why, rxrpc_timer_traces))
+	    );
+
+TRACE_EVENT(rxrpc_timer_restart,
+	    TP_PROTO(struct rxrpc_call *call, ktime_t delay, unsigned long delayj),
+
+	    TP_ARGS(call, delay, delayj),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned int,		call)
+		    __field(unsigned long,		delayj)
+		    __field(ktime_t,			delay)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->call		= call->debug_id;
+		    __entry->delayj		= delayj;
+		    __entry->delay		= delay;
+			   ),
+
+	    TP_printk("c=%08x to=%lld j=%ld",
+		      __entry->call,
+		      (long long)__entry->delay / 1000,
+		      __entry->delayj)
 	    );
 
 TRACE_EVENT(rxrpc_timer_expired,
-	    TP_PROTO(struct rxrpc_call *call, unsigned long now),
+	    TP_PROTO(struct rxrpc_call *call),
 
-	    TP_ARGS(call, now),
+	    TP_ARGS(call),
 
 	    TP_STRUCT__entry(
 		    __field(unsigned int,	call)
-		    __field(long,		now)
-		    __field(long,		ack_at)
-		    __field(long,		ack_lost_at)
-		    __field(long,		resend_at)
-		    __field(long,		ping_at)
-		    __field(long,		expect_rx_by)
-		    __field(long,		expect_req_by)
-		    __field(long,		expect_term_by)
-		    __field(long,		timer)
 			     ),
 
 	    TP_fast_assign(
 		    __entry->call		= call->debug_id;
-		    __entry->now		= now;
-		    __entry->ack_at		= call->delay_ack_at;
-		    __entry->ack_lost_at	= call->ack_lost_at;
-		    __entry->resend_at		= call->resend_at;
-		    __entry->expect_rx_by	= call->expect_rx_by;
-		    __entry->expect_req_by	= call->expect_req_by;
-		    __entry->expect_term_by	= call->expect_term_by;
-		    __entry->timer		= call->timer.expires;
 			   ),
 
-	    TP_printk("c=%08x EXPIRED a=%ld la=%ld r=%ld xr=%ld xq=%ld xt=%ld t=%ld",
-		      __entry->call,
-		      __entry->ack_at - __entry->now,
-		      __entry->ack_lost_at - __entry->now,
-		      __entry->resend_at - __entry->now,
-		      __entry->expect_rx_by - __entry->now,
-		      __entry->expect_req_by - __entry->now,
-		      __entry->expect_term_by - __entry->now,
-		      __entry->timer - __entry->now)
+	    TP_printk("c=%08x EXPIRED",
+		      __entry->call)
 	    );
 
 TRACE_EVENT(rxrpc_rx_lose,
@@ -1507,7 +1519,7 @@ TRACE_EVENT(rxrpc_drop_ack,
 
 TRACE_EVENT(rxrpc_retransmit,
 	    TP_PROTO(struct rxrpc_call *call, rxrpc_seq_t seq,
-		     rxrpc_serial_t serial, s64 expiry),
+		     rxrpc_serial_t serial, ktime_t expiry),
 
 	    TP_ARGS(call, seq, serial, expiry),
 
@@ -1515,7 +1527,7 @@ TRACE_EVENT(rxrpc_retransmit,
 		    __field(unsigned int,	call)
 		    __field(rxrpc_seq_t,	seq)
 		    __field(rxrpc_serial_t,	serial)
-		    __field(s64,		expiry)
+		    __field(ktime_t,		expiry)
 			     ),
 
 	    TP_fast_assign(
@@ -1529,7 +1541,7 @@ TRACE_EVENT(rxrpc_retransmit,
 		      __entry->call,
 		      __entry->seq,
 		      __entry->serial,
-		      __entry->expiry)
+		      (long long)__entry->expiry / 1000)
 	    );
 
 TRACE_EVENT(rxrpc_congest,
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 465bfe5eb061..5222bc97d192 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -487,7 +487,7 @@ EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
  * rxrpc_kernel_set_max_life - Set maximum lifespan on a call
  * @sock: The socket the call is on
  * @call: The call to configure
- * @hard_timeout: The maximum lifespan of the call in jiffies
+ * @hard_timeout: The maximum lifespan of the call in ms
  *
  * Set the maximum lifespan of a call.  The call will end with ETIME or
  * ETIMEDOUT if it takes longer than this.
@@ -495,14 +495,14 @@ EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
 			       unsigned long hard_timeout)
 {
-	unsigned long now;
+	ktime_t delay = ms_to_ktime(hard_timeout), expect_term_by;
 
 	mutex_lock(&call->user_mutex);
 
-	now = jiffies;
-	hard_timeout += now;
-	WRITE_ONCE(call->expect_term_by, hard_timeout);
-	rxrpc_reduce_call_timer(call, hard_timeout, now, rxrpc_timer_set_for_hard);
+	expect_term_by = ktime_add(ktime_get_real(), delay);
+	WRITE_ONCE(call->expect_term_by, expect_term_by);
+	trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
+	rxrpc_poke_call(call, rxrpc_call_poke_set_timeout);
 
 	mutex_unlock(&call->user_mutex);
 }
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 47f4689379ca..21ecac22b51d 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -352,8 +352,8 @@ struct rxrpc_peer {
 	u32			mdev_us;	/* medium deviation			*/
 	u32			mdev_max_us;	/* maximal mdev for the last rtt period	*/
 	u32			rttvar_us;	/* smoothed mdev_max			*/
-	u32			rto_j;		/* Retransmission timeout in jiffies */
-	u8			backoff;	/* Backoff timeout */
+	u32			rto_us;		/* Retransmission timeout in usec */
+	u8			backoff;	/* Backoff timeout (as shift) */
 
 	u8			cong_ssthresh;	/* Congestion slow-start threshold */
 };
@@ -620,17 +620,17 @@ struct rxrpc_call {
 	const struct rxrpc_security *security;	/* applied security module */
 	struct mutex		user_mutex;	/* User access mutex */
 	struct sockaddr_rxrpc	dest_srx;	/* Destination address */
-	unsigned long		delay_ack_at;	/* When DELAY 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) */
-	u32			hard_timo;	/* Maximum lifetime or 0 (jif) */
+	ktime_t			delay_ack_at;	/* When DELAY ACK needs to happen */
+	ktime_t			ack_lost_at;	/* When ACK is figured as lost */
+	ktime_t			resend_at;	/* When next resend needs to happen */
+	ktime_t			ping_at;	/* When next to send a ping */
+	ktime_t			keepalive_at;	/* When next to send a keepalive ping */
+	ktime_t			expect_rx_by;	/* When we expect to get a packet by */
+	ktime_t			expect_req_by;	/* When we expect to get a request DATA packet by */
+	ktime_t			expect_term_by;	/* When we expect call termination by */
+	u32			next_rx_timo;	/* Timeout for next Rx packet (ms) */
+	u32			next_req_timo;	/* Timeout for next Rx request packet (ms) */
+	u32			hard_timo;	/* Maximum lifetime or 0 (s) */
 	struct timer_list	timer;		/* Combined event timer */
 	struct work_struct	destroyer;	/* In-process-context destroyer */
 	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
@@ -675,7 +675,7 @@ struct rxrpc_call {
 	rxrpc_seq_t		tx_transmitted;	/* Highest packet transmitted */
 	rxrpc_seq_t		tx_prepared;	/* Highest Tx slot prepared. */
 	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
-	u16			tx_backoff;	/* Delay to insert due to Tx failure */
+	u16			tx_backoff;	/* Delay to insert due to Tx failure (ms) */
 	u8			tx_winsize;	/* Maximum size of Tx window */
 #define RXRPC_TX_MAX_WINDOW	128
 	ktime_t			tx_last_sent;	/* Last time a transmission occurred */
@@ -866,11 +866,6 @@ void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *);
 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb);
 
-void rxrpc_reduce_call_timer(struct rxrpc_call *call,
-			     unsigned long expire_at,
-			     unsigned long now,
-			     enum rxrpc_timer_trace why);
-
 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb);
 
 /*
@@ -1214,7 +1209,7 @@ static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
  */
 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
 			rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
-unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
+ktime_t rxrpc_get_rto_backoff(struct rxrpc_peer *peer, bool retrans);
 void rxrpc_peer_init_rtt(struct rxrpc_peer *);
 
 /*
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index bc1a5abb7d6f..2a9f74eb7c46 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -23,14 +23,14 @@
 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
 			enum rxrpc_propose_ack_trace why)
 {
-	unsigned long now = jiffies;
-	unsigned long ping_at = now + rxrpc_idle_ack_delay;
+	ktime_t delay = ms_to_ktime(READ_ONCE(rxrpc_idle_ack_delay));
+	ktime_t now = ktime_get_real();
+	ktime_t ping_at = ktime_add(now, delay);
 
-	if (time_before(ping_at, call->ping_at)) {
+	trace_rxrpc_propose_ack(call, why, RXRPC_ACK_PING, serial);
+	if (ktime_before(ping_at, call->ping_at)) {
 		call->ping_at = ping_at;
-		rxrpc_reduce_call_timer(call, ping_at, now,
-					rxrpc_timer_set_for_ping);
-		trace_rxrpc_propose_ack(call, why, RXRPC_ACK_PING, serial);
+		trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_ping);
 	}
 }
 
@@ -40,25 +40,18 @@ void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
 void rxrpc_propose_delay_ACK(struct rxrpc_call *call, rxrpc_serial_t serial,
 			     enum rxrpc_propose_ack_trace why)
 {
-	unsigned long expiry = rxrpc_soft_ack_delay;
-	unsigned long now = jiffies, ack_at;
+	ktime_t now = ktime_get_real(), delay;
 
-	if (rxrpc_soft_ack_delay < expiry)
-		expiry = rxrpc_soft_ack_delay;
-	if (call->peer->srtt_us != 0)
-		ack_at = usecs_to_jiffies(call->peer->srtt_us >> 3);
+	trace_rxrpc_propose_ack(call, why, RXRPC_ACK_DELAY, serial);
+
+	if (call->peer->srtt_us)
+		delay = (call->peer->srtt_us >> 3) * NSEC_PER_USEC;
 	else
-		ack_at = expiry;
-
-	ack_at += READ_ONCE(call->tx_backoff);
-	ack_at += now;
-	if (time_before(ack_at, call->delay_ack_at)) {
-		call->delay_ack_at = ack_at;
-		rxrpc_reduce_call_timer(call, ack_at, now,
-					rxrpc_timer_set_for_ack);
-	}
+		delay = ms_to_ktime(READ_ONCE(rxrpc_soft_ack_delay));
+	ktime_add_ms(delay, call->tx_backoff);
 
-	trace_rxrpc_propose_ack(call, why, RXRPC_ACK_DELAY, serial);
+	call->delay_ack_at = ktime_add(now, delay);
+	trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_delayed_ack);
 }
 
 /*
@@ -77,9 +70,8 @@ void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb)
 	struct rxrpc_ackpacket *ack = NULL;
 	struct rxrpc_skb_priv *sp;
 	struct rxrpc_txbuf *txb;
-	unsigned long resend_at;
 	rxrpc_seq_t transmitted = call->tx_transmitted;
-	ktime_t now, max_age, oldest, ack_ts;
+	ktime_t now, max_age, oldest, ack_ts, delay;
 	bool unacked = false;
 	unsigned int i;
 	LIST_HEAD(retrans_queue);
@@ -87,7 +79,7 @@ void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb)
 	_enter("{%d,%d}", call->acks_hard_ack, call->tx_top);
 
 	now = ktime_get_real();
-	max_age = ktime_sub_us(now, jiffies_to_usecs(call->peer->rto_j));
+	max_age = ktime_sub_us(now, call->peer->rto_us);
 	oldest = now;
 
 	if (list_empty(&call->tx_buffer))
@@ -178,10 +170,8 @@ void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb)
 
 no_further_resend:
 no_resend:
-	resend_at = nsecs_to_jiffies(ktime_to_ns(ktime_sub(now, oldest)));
-	resend_at += jiffies + rxrpc_get_rto_backoff(call->peer,
-						     !list_empty(&retrans_queue));
-	call->resend_at = resend_at;
+	delay = rxrpc_get_rto_backoff(call->peer, !list_empty(&retrans_queue));
+	call->resend_at = ktime_add(oldest, delay);
 
 	if (unacked)
 		rxrpc_congestion_timeout(call);
@@ -191,8 +181,7 @@ void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb)
 	 * retransmitting data.
 	 */
 	if (list_empty(&retrans_queue)) {
-		rxrpc_reduce_call_timer(call, resend_at, jiffies,
-					rxrpc_timer_set_for_resend);
+		trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_resend_reset);
 		ack_ts = ktime_sub(now, call->acks_latest_ts);
 		if (ktime_to_us(ack_ts) < (call->peer->srtt_us >> 3))
 			goto out;
@@ -218,13 +207,11 @@ void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb)
  */
 static void rxrpc_begin_service_reply(struct rxrpc_call *call)
 {
-	unsigned long now = jiffies;
-
 	rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SEND_REPLY);
-	call->delay_ack_at = now + MAX_JIFFY_OFFSET;
 	if (call->ackr_reason == RXRPC_ACK_DELAY)
 		call->ackr_reason = 0;
-	trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
+	call->delay_ack_at = KTIME_MAX;
+	trace_rxrpc_timer_can(call, rxrpc_timer_trace_delayed_ack);
 }
 
 /*
@@ -333,8 +320,8 @@ static void rxrpc_send_initial_ping(struct rxrpc_call *call)
  */
 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 {
-	unsigned long now, next, t;
-	bool resend = false, expired = false;
+	ktime_t now, t;
+	bool resend = false;
 	s32 abort_code;
 
 	rxrpc_see_call(call, rxrpc_call_see_input);
@@ -362,66 +349,69 @@ bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 		rxrpc_input_call_packet(call, skb);
 
 	/* If we see our async-event poke, check for timeout trippage. */
-	now = jiffies;
-	t = call->expect_rx_by;
-	if (time_after_eq(now, t)) {
-		trace_rxrpc_timer(call, rxrpc_timer_exp_normal, now);
-		expired = true;
+	now = ktime_get_real();
+	t = ktime_sub(call->expect_rx_by, now);
+	if (t <= 0) {
+		trace_rxrpc_timer_exp(call, t, rxrpc_timer_trace_expect_rx);
+		goto expired;
 	}
 
-	t = call->expect_req_by;
-	if (__rxrpc_call_state(call) == RXRPC_CALL_SERVER_RECV_REQUEST &&
-	    time_after_eq(now, t)) {
-		trace_rxrpc_timer(call, rxrpc_timer_exp_idle, now);
-		expired = true;
+	t = ktime_sub(call->expect_req_by, now);
+	if (t <= 0) {
+		call->expect_req_by = KTIME_MAX;
+		if (__rxrpc_call_state(call) == RXRPC_CALL_SERVER_RECV_REQUEST) {
+			trace_rxrpc_timer_exp(call, t, rxrpc_timer_trace_idle);
+			goto expired;
+		}
 	}
 
-	t = READ_ONCE(call->expect_term_by);
-	if (time_after_eq(now, t)) {
-		trace_rxrpc_timer(call, rxrpc_timer_exp_hard, now);
-		expired = true;
+	t = ktime_sub(READ_ONCE(call->expect_term_by), now);
+	if (t <= 0) {
+		trace_rxrpc_timer_exp(call, t, rxrpc_timer_trace_hard);
+		goto expired;
 	}
 
-	t = call->delay_ack_at;
-	if (time_after_eq(now, t)) {
-		trace_rxrpc_timer(call, rxrpc_timer_exp_ack, now);
-		call->delay_ack_at = now + MAX_JIFFY_OFFSET;
+	t = ktime_sub(call->delay_ack_at, now);
+	if (t <= 0) {
+		trace_rxrpc_timer_exp(call, t, rxrpc_timer_trace_delayed_ack);
+		call->delay_ack_at = KTIME_MAX;
 		rxrpc_send_ACK(call, RXRPC_ACK_DELAY, 0,
 			       rxrpc_propose_ack_delayed_ack);
 	}
 
-	t = call->ack_lost_at;
-	if (time_after_eq(now, t)) {
-		trace_rxrpc_timer(call, rxrpc_timer_exp_lost_ack, now);
-		call->ack_lost_at = now + MAX_JIFFY_OFFSET;
+	t = ktime_sub(call->ack_lost_at, now);
+	if (t <= 0) {
+		trace_rxrpc_timer_exp(call, t, rxrpc_timer_trace_lost_ack);
+		call->ack_lost_at = KTIME_MAX;
 		set_bit(RXRPC_CALL_EV_ACK_LOST, &call->events);
 	}
 
-	t = call->keepalive_at;
-	if (time_after_eq(now, t)) {
-		trace_rxrpc_timer(call, rxrpc_timer_exp_keepalive, now);
-		call->keepalive_at = now + MAX_JIFFY_OFFSET;
+	t = ktime_sub(call->ping_at, now);
+	if (t <= 0) {
+		trace_rxrpc_timer_exp(call, t, rxrpc_timer_trace_ping);
+		call->ping_at = KTIME_MAX;
 		rxrpc_send_ACK(call, RXRPC_ACK_PING, 0,
 			       rxrpc_propose_ack_ping_for_keepalive);
 	}
 
-	t = call->ping_at;
-	if (time_after_eq(now, t)) {
-		trace_rxrpc_timer(call, rxrpc_timer_exp_ping, now);
-		call->ping_at = now + MAX_JIFFY_OFFSET;
-		rxrpc_send_ACK(call, RXRPC_ACK_PING, 0,
-			       rxrpc_propose_ack_ping_for_keepalive);
-	}
-
-	t = call->resend_at;
-	if (time_after_eq(now, t)) {
-		trace_rxrpc_timer(call, rxrpc_timer_exp_resend, now);
-		call->resend_at = now + MAX_JIFFY_OFFSET;
+	t = ktime_sub(call->resend_at, now);
+	if (t <= 0) {
+		trace_rxrpc_timer_exp(call, t, rxrpc_timer_trace_resend);
+		call->resend_at = KTIME_MAX;
 		resend = true;
 	}
 
 	rxrpc_transmit_some_data(call);
 
+	now = ktime_get_real();
+	t = ktime_sub(call->keepalive_at, now);
+	if (t <= 0) {
+		trace_rxrpc_timer_exp(call, t, rxrpc_timer_trace_keepalive);
+		call->keepalive_at = KTIME_MAX;
+		rxrpc_send_ACK(call, RXRPC_ACK_PING, 0,
+			       rxrpc_propose_ack_ping_for_keepalive);
+	}
+
 	if (skb) {
 		struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 
@@ -433,19 +423,6 @@ bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 		rxrpc_send_initial_ping(call);
 
 	/* Process events */
-	if (expired) {
-		if (test_bit(RXRPC_CALL_RX_HEARD, &call->flags) &&
-		    (int)call->conn->hi_serial - (int)call->rx_serial > 0) {
-			trace_rxrpc_call_reset(call);
-			rxrpc_abort_call(call, 0, RX_CALL_DEAD, -ECONNRESET,
-					 rxrpc_abort_call_reset);
-		} else {
-			rxrpc_abort_call(call, 0, RX_CALL_TIMEOUT, -ETIME,
-					 rxrpc_abort_call_timeout);
-		}
-		goto out;
-	}
-
 	if (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events))
 		rxrpc_send_ACK(call, RXRPC_ACK_PING, 0,
 			       rxrpc_propose_ack_ping_for_lost_ack);
@@ -474,23 +451,33 @@ bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 
 	/* Make sure the timer is restarted */
 	if (!__rxrpc_call_is_complete(call)) {
-		next = call->expect_rx_by;
+		ktime_t next = READ_ONCE(call->expect_term_by), delay;
 
-#define set(T) { t = READ_ONCE(T); if (time_before(t, next)) next = t; }
+#define set(T) { ktime_t _t = (T); if (ktime_before(_t, next)) next = _t; }
 
 		set(call->expect_req_by);
-		set(call->expect_term_by);
+		set(call->expect_rx_by);
 		set(call->delay_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))
+		now = ktime_get_real();
+		delay = ktime_sub(next, now);
+		if (delay <= 0) {
 			rxrpc_poke_call(call, rxrpc_call_poke_timer_now);
-
-		rxrpc_reduce_call_timer(call, next, now, rxrpc_timer_restart);
+		} else {
+			unsigned long nowj = jiffies, delayj, nextj;
+
+			delayj = max(nsecs_to_jiffies(delay), 1);
+			nextj = nowj + delayj;
+			if (time_before(nextj, call->timer.expires) ||
+			    !timer_pending(&call->timer)) {
+				trace_rxrpc_timer_restart(call, delay, delayj);
+				timer_reduce(&call->timer, nextj);
+			}
+		}
 	}
 
 out:
@@ -505,4 +492,16 @@ bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 		rxrpc_shrink_call_tx_buffer(call);
 	_leave("");
 	return true;
+
+expired:
+	if (test_bit(RXRPC_CALL_RX_HEARD, &call->flags) &&
+	    (int)call->conn->hi_serial - (int)call->rx_serial > 0) {
+		trace_rxrpc_call_reset(call);
+		rxrpc_abort_call(call, 0, RX_CALL_DEAD, -ECONNRESET,
+				 rxrpc_abort_call_reset);
+	} else {
+		rxrpc_abort_call(call, 0, RX_CALL_TIMEOUT, -ETIME,
+				 rxrpc_abort_call_timeout);
+	}
+	goto out;
 }
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 9fc9a6c3f685..01fa71e8b1f7 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -70,20 +70,11 @@ static void rxrpc_call_timer_expired(struct timer_list *t)
 	_enter("%d", call->debug_id);
 
 	if (!__rxrpc_call_is_complete(call)) {
-		trace_rxrpc_timer_expired(call, jiffies);
+		trace_rxrpc_timer_expired(call);
 		rxrpc_poke_call(call, rxrpc_call_poke_timer);
 	}
 }
 
-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);
-}
-
 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
 
 static void rxrpc_destroy_call(struct work_struct *);
@@ -163,12 +154,20 @@ struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
 	spin_lock_init(&call->notify_lock);
 	spin_lock_init(&call->tx_lock);
 	refcount_set(&call->ref, 1);
-	call->debug_id = debug_id;
-	call->tx_total_len = -1;
-	call->next_rx_timo = 20 * HZ;
-	call->next_req_timo = 1 * HZ;
-	call->ackr_window = 1;
-	call->ackr_wtop = 1;
+	call->debug_id		= debug_id;
+	call->tx_total_len	= -1;
+	call->next_rx_timo	= 20 * HZ;
+	call->next_req_timo	= 1 * HZ;
+	call->ackr_window	= 1;
+	call->ackr_wtop		= 1;
+	call->delay_ack_at	= KTIME_MAX;
+	call->ack_lost_at	= KTIME_MAX;
+	call->resend_at		= KTIME_MAX;
+	call->ping_at		= KTIME_MAX;
+	call->keepalive_at	= KTIME_MAX;
+	call->expect_rx_by	= KTIME_MAX;
+	call->expect_req_by	= KTIME_MAX;
+	call->expect_term_by	= KTIME_MAX;
 
 	memset(&call->sock_node, 0xed, sizeof(call->sock_node));
 
@@ -226,11 +225,11 @@ static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
 		__set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
 
 	if (p->timeouts.normal)
-		call->next_rx_timo = min(msecs_to_jiffies(p->timeouts.normal), 1UL);
+		call->next_rx_timo = min(p->timeouts.normal, 1);
 	if (p->timeouts.idle)
-		call->next_req_timo = min(msecs_to_jiffies(p->timeouts.idle), 1UL);
+		call->next_req_timo = min(p->timeouts.idle, 1);
 	if (p->timeouts.hard)
-		call->hard_timo = p->timeouts.hard * HZ;
+		call->hard_timo = p->timeouts.hard;
 
 	ret = rxrpc_init_client_call_security(call);
 	if (ret < 0) {
@@ -253,18 +252,13 @@ static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
  */
 void rxrpc_start_call_timer(struct rxrpc_call *call)
 {
-	unsigned long now = jiffies;
-	unsigned long j = now + MAX_JIFFY_OFFSET;
-
-	call->delay_ack_at = j;
-	call->ack_lost_at = j;
-	call->resend_at = j;
-	call->ping_at = j;
-	call->keepalive_at = j;
-	call->expect_rx_by = j;
-	call->expect_req_by = j;
-	call->expect_term_by = j + call->hard_timo;
-	call->timer.expires = now;
+	if (call->hard_timo) {
+		ktime_t delay = ms_to_ktime(call->hard_timo * 1000);
+
+		call->expect_term_by = ktime_add(ktime_get_real(), delay);
+		trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
+	}
+	call->timer.expires = jiffies;
 }
 
 /*
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index e53a49accc16..09cce1d5d605 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -252,6 +252,9 @@ static void rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
 {
 	ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags));
 
+	call->resend_at = KTIME_MAX;
+	trace_rxrpc_timer_can(call, rxrpc_timer_trace_resend);
+
 	if (unlikely(call->cong_last_nack)) {
 		rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack);
 		call->cong_last_nack = NULL;
@@ -288,13 +291,11 @@ static void rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
 static bool rxrpc_receiving_reply(struct rxrpc_call *call)
 {
 	struct rxrpc_ack_summary summary = { 0 };
-	unsigned long now;
 	rxrpc_seq_t top = READ_ONCE(call->tx_top);
 
 	if (call->ackr_reason) {
-		now = jiffies;
-		call->delay_ack_at = now + MAX_JIFFY_OFFSET;
-		trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now);
+		call->delay_ack_at = KTIME_MAX;
+		trace_rxrpc_timer_can(call, rxrpc_timer_trace_delayed_ack);
 	}
 
 	if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) {
@@ -327,7 +328,7 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call, rxrpc_serial_t serial)
 
 	case RXRPC_CALL_SERVER_RECV_REQUEST:
 		rxrpc_set_call_state(call, RXRPC_CALL_SERVER_ACK_REQUEST);
-		call->expect_req_by = jiffies + MAX_JIFFY_OFFSET;
+		call->expect_req_by = KTIME_MAX;
 		rxrpc_propose_delay_ACK(call, serial, rxrpc_propose_ack_processing_op);
 		break;
 
@@ -587,14 +588,12 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb)
 
 	case 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;
-			call->expect_req_by = now + timo;
-			rxrpc_reduce_call_timer(call, expect_req_by, now,
-						rxrpc_timer_set_for_idle);
+			ktime_t delay = ms_to_ktime(timo);
+
+			call->expect_req_by = ktime_add(ktime_get_real(), delay);
+			trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_idle);
 		}
 		break;
 	}
@@ -1046,11 +1045,10 @@ void rxrpc_input_call_packet(struct rxrpc_call *call, struct sk_buff *skb)
 
 	timo = READ_ONCE(call->next_rx_timo);
 	if (timo) {
-		unsigned long now = jiffies;
+		ktime_t delay = ms_to_ktime(timo);
 
-		call->expect_rx_by = now + timo;
-		rxrpc_reduce_call_timer(call, call->expect_rx_by, now,
-					rxrpc_timer_set_for_normal);
+		call->expect_rx_by = ktime_add(ktime_get_real(), delay);
+		trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_expect_rx);
 	}
 
 	switch (sp->hdr.type) {
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index 825b81183046..657cf35089a6 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -17,22 +17,22 @@
 unsigned int rxrpc_max_backlog __read_mostly = 10;
 
 /*
- * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
+ * How long to wait before scheduling an ACK with subtype DELAY (in ms).
  *
  * 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 long rxrpc_soft_ack_delay = HZ;
+unsigned long rxrpc_soft_ack_delay = 1000;
 
 /*
- * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
+ * How long to wait before scheduling an ACK with subtype IDLE (in ms).
  *
  * 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 long rxrpc_idle_ack_delay = HZ / 2;
+unsigned long rxrpc_idle_ack_delay = 500;
 
 /*
  * Receive window size in packets.  This indicates the maximum number of
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 0a317498b8e0..ec82193e5681 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -48,12 +48,10 @@ static const char rxrpc_keepalive_string[] = "";
 static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret)
 {
 	if (ret < 0) {
-		u16 tx_backoff = READ_ONCE(call->tx_backoff);
-
-		if (tx_backoff < HZ)
-			WRITE_ONCE(call->tx_backoff, tx_backoff + 1);
+		if (call->tx_backoff < 1000)
+			call->tx_backoff += 100;
 	} else {
-		WRITE_ONCE(call->tx_backoff, 0);
+		call->tx_backoff = 0;
 	}
 }
 
@@ -67,11 +65,10 @@ static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret)
  */
 static void rxrpc_set_keepalive(struct rxrpc_call *call)
 {
-	unsigned long now = jiffies;
+	ktime_t delay = ms_to_ktime(READ_ONCE(call->next_rx_timo) / 6);
 
-	call->keepalive_at = now + call->next_rx_timo / 6;
-	rxrpc_reduce_call_timer(call, call->keepalive_at, now,
-				rxrpc_timer_set_for_keepalive);
+	call->keepalive_at = ktime_add(ktime_get_real(), delay);
+	trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_keepalive);
 }
 
 /*
@@ -515,24 +512,21 @@ static int rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_txbuf *t
 		if (txb->flags & RXRPC_REQUEST_ACK) {
 			call->peer->rtt_last_req = txb->last_sent;
 			if (call->peer->rtt_count > 1) {
-				unsigned long nowj = jiffies, ack_lost_at;
+				ktime_t delay = rxrpc_get_rto_backoff(call->peer, false);
+				ktime_t now = ktime_get_real();
 
-				ack_lost_at = rxrpc_get_rto_backoff(call->peer, false);
-				ack_lost_at += nowj;
-				call->ack_lost_at = ack_lost_at;
-				rxrpc_reduce_call_timer(call, ack_lost_at, nowj,
-							rxrpc_timer_set_for_lost_ack);
+				call->ack_lost_at = ktime_add(now, delay);
+				trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_lost_ack);
 			}
 		}
 
 		if (txb->seq == 1 &&
 		    !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER,
 				      &call->flags)) {
-			unsigned long nowj = jiffies;
+			ktime_t delay = ms_to_ktime(READ_ONCE(call->next_rx_timo));
 
-			call->expect_rx_by = nowj + call->next_rx_timo;
-			rxrpc_reduce_call_timer(call, call->expect_rx_by, nowj,
-						rxrpc_timer_set_for_normal);
+			call->expect_rx_by = ktime_add(ktime_get_real(), delay);
+			trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_expect_rx);
 		}
 
 		rxrpc_set_keepalive(call);
@@ -755,11 +749,9 @@ void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb)
 			rxrpc_instant_resend(call, txb);
 		}
 	} else {
-		unsigned long now = jiffies;
-		unsigned long resend_at = now + call->peer->rto_j;
+		ktime_t delay = ns_to_ktime(call->peer->rto_us * NSEC_PER_USEC);
 
-		call->resend_at = resend_at;
-		rxrpc_reduce_call_timer(call, resend_at, now,
-					rxrpc_timer_set_for_send);
+		call->resend_at = ktime_add(ktime_get_real(), delay);
+		trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_resend_tx);
 	}
 }
diff --git a/net/rxrpc/proc.c b/net/rxrpc/proc.c
index 26dc2f26d92d..263a2251e3d2 100644
--- a/net/rxrpc/proc.c
+++ b/net/rxrpc/proc.c
@@ -52,9 +52,9 @@ static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
 	struct rxrpc_call *call;
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 	enum rxrpc_call_state state;
-	unsigned long timeout = 0;
 	rxrpc_seq_t acks_hard_ack;
 	char lbuff[50], rbuff[50];
+	long timeout = 0;
 
 	if (v == &rxnet->calls) {
 		seq_puts(seq,
@@ -76,10 +76,8 @@ static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
 	sprintf(rbuff, "%pISpc", &call->dest_srx.transport);
 
 	state = rxrpc_call_state(call);
-	if (state != RXRPC_CALL_SERVER_PREALLOC) {
-		timeout = READ_ONCE(call->expect_rx_by);
-		timeout -= jiffies;
-	}
+	if (state != RXRPC_CALL_SERVER_PREALLOC)
+		timeout = ktime_ms_delta(READ_ONCE(call->expect_rx_by), ktime_get_real());
 
 	acks_hard_ack = READ_ONCE(call->acks_hard_ack);
 	seq_printf(seq,
@@ -309,7 +307,7 @@ static int rxrpc_peer_seq_show(struct seq_file *seq, void *v)
 		   peer->mtu,
 		   now - peer->last_tx_at,
 		   peer->srtt_us >> 3,
-		   jiffies_to_usecs(peer->rto_j));
+		   peer->rto_us);
 
 	return 0;
 }
diff --git a/net/rxrpc/rtt.c b/net/rxrpc/rtt.c
index be61d6f5be8d..cdab7b7d08a0 100644
--- a/net/rxrpc/rtt.c
+++ b/net/rxrpc/rtt.c
@@ -11,8 +11,8 @@
 #include <linux/net.h>
 #include "ar-internal.h"
 
-#define RXRPC_RTO_MAX	((unsigned)(120 * HZ))
-#define RXRPC_TIMEOUT_INIT ((unsigned)(1*HZ))	/* RFC6298 2.1 initial RTO value	*/
+#define RXRPC_RTO_MAX	(120 * USEC_PER_SEC)
+#define RXRPC_TIMEOUT_INIT ((unsigned int)(1 * MSEC_PER_SEC)) /* RFC6298 2.1 initial RTO value */
 #define rxrpc_jiffies32 ((u32)jiffies)		/* As rxrpc_jiffies32 */
 
 static u32 rxrpc_rto_min_us(struct rxrpc_peer *peer)
@@ -22,7 +22,7 @@ static u32 rxrpc_rto_min_us(struct rxrpc_peer *peer)
 
 static u32 __rxrpc_set_rto(const struct rxrpc_peer *peer)
 {
-	return usecs_to_jiffies((peer->srtt_us >> 3) + peer->rttvar_us);
+	return (peer->srtt_us >> 3) + peer->rttvar_us;
 }
 
 static u32 rxrpc_bound_rto(u32 rto)
@@ -124,7 +124,7 @@ static void rxrpc_set_rto(struct rxrpc_peer *peer)
 	/* NOTE: clamping at RXRPC_RTO_MIN is not required, current algo
 	 * guarantees that rto is higher.
 	 */
-	peer->rto_j = rxrpc_bound_rto(rto);
+	peer->rto_us = rxrpc_bound_rto(rto);
 }
 
 static void rxrpc_ack_update_rtt(struct rxrpc_peer *peer, long rtt_us)
@@ -163,33 +163,33 @@ void rxrpc_peer_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
 	spin_unlock(&peer->rtt_input_lock);
 
 	trace_rxrpc_rtt_rx(call, why, rtt_slot, send_serial, resp_serial,
-			   peer->srtt_us >> 3, peer->rto_j);
+			   peer->srtt_us >> 3, peer->rto_us);
 }
 
 /*
- * Get the retransmission timeout to set in jiffies, backing it off each time
- * we retransmit.
+ * Get the retransmission timeout to set in nanoseconds, backing it off each
+ * time we retransmit.
  */
-unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *peer, bool retrans)
+ktime_t rxrpc_get_rto_backoff(struct rxrpc_peer *peer, bool retrans)
 {
-	u64 timo_j;
-	u8 backoff = READ_ONCE(peer->backoff);
+	u64 timo_us;
+	u32 backoff = READ_ONCE(peer->backoff);
 
-	timo_j = peer->rto_j;
-	timo_j <<= backoff;
-	if (retrans && timo_j * 2 <= RXRPC_RTO_MAX)
+	timo_us = peer->rto_us;
+	timo_us <<= backoff;
+	if (retrans && timo_us * 2 <= RXRPC_RTO_MAX)
 		WRITE_ONCE(peer->backoff, backoff + 1);
 
-	if (timo_j < 1)
-		timo_j = 1;
+	if (timo_us < 1)
+		timo_us = 1;
 
-	return timo_j;
+	return ns_to_ktime(timo_us * NSEC_PER_USEC);
 }
 
 void rxrpc_peer_init_rtt(struct rxrpc_peer *peer)
 {
-	peer->rto_j	= RXRPC_TIMEOUT_INIT;
-	peer->mdev_us	= jiffies_to_usecs(RXRPC_TIMEOUT_INIT);
+	peer->rto_us	= RXRPC_TIMEOUT_INIT;
+	peer->mdev_us	= RXRPC_TIMEOUT_INIT;
 	peer->backoff	= 0;
 	//minmax_reset(&peer->rtt_min, rxrpc_jiffies32, ~0U);
 }
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 4d152f06b039..6f765768c49c 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -609,7 +609,6 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
 	__releases(&rx->sk.sk_lock.slock)
 {
 	struct rxrpc_call *call;
-	unsigned long now, j;
 	bool dropped_lock = false;
 	int ret;
 
@@ -687,25 +686,21 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t 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);
+		WRITE_ONCE(call->next_rx_timo, p.call.timeouts.normal);
 		fallthrough;
 	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);
+		WRITE_ONCE(call->next_req_timo, p.call.timeouts.idle);
 		fallthrough;
 	case 1:
 		if (p.call.timeouts.hard > 0) {
-			j = p.call.timeouts.hard * HZ;
-			now = jiffies;
-			j += now;
-			WRITE_ONCE(call->expect_term_by, j);
-			rxrpc_reduce_call_timer(call, j, now,
-						rxrpc_timer_set_for_hard);
+			ktime_t delay = ms_to_ktime(p.call.timeouts.hard * MSEC_PER_SEC);
+
+			WRITE_ONCE(call->expect_term_by,
+				   ktime_add(p.call.timeouts.hard,
+					     ktime_get_real()));
+			trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
+			rxrpc_poke_call(call, rxrpc_call_poke_set_timeout);
+
 		}
 		break;
 	}
diff --git a/net/rxrpc/sysctl.c b/net/rxrpc/sysctl.c
index ecaeb4ecfb58..c9bedd0e2d86 100644
--- a/net/rxrpc/sysctl.c
+++ b/net/rxrpc/sysctl.c
@@ -15,6 +15,8 @@ static const unsigned int four = 4;
 static const unsigned int max_backlog = RXRPC_BACKLOG_MAX - 1;
 static const unsigned int n_65535 = 65535;
 static const unsigned int n_max_acks = 255;
+static const unsigned long one_ms = 1;
+static const unsigned long max_ms = 1000;
 static const unsigned long one_jiffy = 1;
 static const unsigned long max_jiffies = MAX_JIFFY_OFFSET;
 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
@@ -28,24 +30,24 @@ static const unsigned long max_500 = 500;
  * information on the individual parameters.
  */
 static struct ctl_table rxrpc_sysctl_table[] = {
-	/* Values measured in milliseconds but used in jiffies */
+	/* Values measured in milliseconds */
 	{
 		.procname	= "soft_ack_delay",
 		.data		= &rxrpc_soft_ack_delay,
 		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
-		.extra1		= (void *)&one_jiffy,
-		.extra2		= (void *)&max_jiffies,
+		.proc_handler	= proc_doulongvec_minmax,
+		.extra1		= (void *)&one_ms,
+		.extra2		= (void *)&max_ms,
 	},
 	{
 		.procname	= "idle_ack_delay",
 		.data		= &rxrpc_idle_ack_delay,
 		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_doulongvec_ms_jiffies_minmax,
-		.extra1		= (void *)&one_jiffy,
-		.extra2		= (void *)&max_jiffies,
+		.proc_handler	= proc_doulongvec_minmax,
+		.extra1		= (void *)&one_ms,
+		.extra2		= (void *)&max_ms,
 	},
 	{
 		.procname	= "idle_conn_expiry",