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rxrpc: Fix call timeouts

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Fix the rxrpc call expiration timeouts and make them settable from
userspace.  By analogy with other rx implementations, there should be three
timeouts:

 (1) "Normal timeout"

     This is set for all calls and is triggered if we haven't received any
     packets from the peer in a while.  It is measured from the last time
     we received any packet on that call.  This is not reset by any
     connection packets (such as CHALLENGE/RESPONSE packets).

     If a service operation takes a long time, the server should generate
     PING ACKs at a duration that's substantially less than the normal
     timeout so is to keep both sides alive.  This is set at 1/6 of normal
     timeout.

 (2) "Idle timeout"

     This is set only for a service call and is triggered if we stop
     receiving the DATA packets that comprise the request data.  It is
     measured from the last time we received a DATA packet.

 (3) "Hard timeout"

     This can be set for a call and specified the maximum lifetime of that
     call.  It should not be specified by default.  Some operations (such
     as volume transfer) take a long time.

Allow userspace to set/change the timeouts on a call with sendmsg, using a
control message:

	RXRPC_SET_CALL_TIMEOUTS

The data to the message is a number of 32-bit words, not all of which need
be given:

	u32 hard_timeout;	/* sec from first packet */
	u32 idle_timeout;	/* msec from packet Rx */
	u32 normal_timeout;	/* msec from data Rx */

This can be set in combination with any other sendmsg() that affects a
call.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2017-11-24 10:18:41 +00:00
parent 4812417894
commit a158bdd324
11 changed files with 289 additions and 200 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

69
include/trace/events/rxrpc.h
View file

@ -138,10 +138,20 @@ enum rxrpc_rtt_rx_trace {
enum rxrpc_timer_trace {
rxrpc_timer_begin,
rxrpc_timer_exp_ack,
rxrpc_timer_exp_hard,
rxrpc_timer_exp_idle,
rxrpc_timer_exp_normal,
rxrpc_timer_exp_ping,
rxrpc_timer_exp_resend,
rxrpc_timer_expired,
rxrpc_timer_init_for_reply,
rxrpc_timer_init_for_send_reply,
rxrpc_timer_restart,
rxrpc_timer_set_for_ack,
rxrpc_timer_set_for_hard,
rxrpc_timer_set_for_idle,
rxrpc_timer_set_for_normal,
rxrpc_timer_set_for_ping,
rxrpc_timer_set_for_resend,
rxrpc_timer_set_for_send,
@ -296,12 +306,22 @@ enum rxrpc_congest_change {
#define rxrpc_timer_traces \
EM(rxrpc_timer_begin, "Begin ") \
EM(rxrpc_timer_expired, "*EXPR*") \
EM(rxrpc_timer_exp_ack, "ExpAck") \
EM(rxrpc_timer_exp_hard, "ExpHrd") \
EM(rxrpc_timer_exp_idle, "ExpIdl") \
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_normal, "SetNml") \
EM(rxrpc_timer_set_for_ping, "SetPng") \
EM(rxrpc_timer_set_for_resend, "SetRTx") \
E_(rxrpc_timer_set_for_send, "SetTx ")
E_(rxrpc_timer_set_for_send, "SetSnd")
#define rxrpc_propose_ack_traces \
EM(rxrpc_propose_ack_client_tx_end, "ClTxEnd") \
@ -932,39 +952,44 @@ TRACE_EVENT(rxrpc_rtt_rx,
TRACE_EVENT(rxrpc_timer,
TP_PROTO(struct rxrpc_call *call, enum rxrpc_timer_trace why,
ktime_t now, unsigned long now_j),
unsigned long now),
TP_ARGS(call, why, now, now_j),
TP_ARGS(call, why, now),
TP_STRUCT__entry(
__field(struct rxrpc_call *, call )
__field(enum rxrpc_timer_trace, why )
__field_struct(ktime_t, now )
__field_struct(ktime_t, expire_at )
__field_struct(ktime_t, ack_at )
__field_struct(ktime_t, resend_at )
__field(unsigned long, now_j )
__field(unsigned long, timer )
__field(long, now )
__field(long, ack_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;
__entry->why = why;
__entry->now = now;
__entry->expire_at = call->expire_at;
__entry->ack_at = call->ack_at;
__entry->resend_at = call->resend_at;
__entry->now_j = now_j;
__entry->timer = call->timer.expires;
__entry->call = call;
__entry->why = why;
__entry->now = now;
__entry->ack_at = call->ack_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=%p %s x=%lld a=%lld r=%lld t=%ld",
TP_printk("c=%p %s a=%ld r=%ld xr=%ld xq=%ld xt=%ld t=%ld",
__entry->call,
__print_symbolic(__entry->why, rxrpc_timer_traces),
ktime_to_ns(ktime_sub(__entry->expire_at, __entry->now)),
ktime_to_ns(ktime_sub(__entry->ack_at, __entry->now)),
ktime_to_ns(ktime_sub(__entry->resend_at, __entry->now)),
__entry->timer - __entry->now_j)
__entry->ack_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)
);
TRACE_EVENT(rxrpc_rx_lose,

1
include/uapi/linux/rxrpc.h
View file

@ -59,6 +59,7 @@ enum rxrpc_cmsg_type {
RXRPC_EXCLUSIVE_CALL = 10, /* s-: Call should be on exclusive connection */
RXRPC_UPGRADE_SERVICE = 11, /* s-: Request service upgrade for client call */
RXRPC_TX_LENGTH = 12, /* s-: Total length of Tx data */
RXRPC_SET_CALL_TIMEOUT = 13, /* s-: Set one or more call timeouts */
RXRPC__SUPPORTED
};

37
net/rxrpc/ar-internal.h
View file

@ -468,9 +468,9 @@ 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 */
};
/*
@ -514,10 +514,14 @@ 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 resend_at; /* When next resend needs to happen */
unsigned long ping_at; /* When next to send a 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 */
@ -697,12 +701,19 @@ 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
*/
@ -843,8 +854,8 @@ 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);
@ -976,13 +987,13 @@ 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[];

179
net/rxrpc/call_event.c
View file

@ -21,80 +21,6 @@
#include <net/af_rxrpc.h>
#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.
*/
@ -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 now, ack_at, 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 +116,12 @@ 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);
now = jiffies;
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 +154,20 @@ 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;
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);
now = ktime_get_real();
max_age = ktime_sub_ms(now, rxrpc_resend_timeout * 1000 / HZ);
spin_lock_bh(&call->lock);
@ -282,7 +211,9 @@ 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);
@ -292,7 +223,8 @@ 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)
@ -364,7 +296,7 @@ void rxrpc_process_call(struct work_struct *work)
{
struct rxrpc_call *call =
container_of(work, struct rxrpc_call, processor);
ktime_t now;
unsigned long now, next, t;
rxrpc_see_call(call);
@ -384,8 +316,50 @@ void rxrpc_process_call(struct work_struct *work)
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->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;
@ -408,7 +382,22 @@ void rxrpc_process_call(struct work_struct *work)
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->resend_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) {

25
net/rxrpc/call_object.c
View file

@ -51,8 +51,10 @@ static void rxrpc_call_timer_expired(unsigned long _call)
_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;
@ -139,6 +141,8 @@ struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, 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));
@ -189,15 +193,16 @@ static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
*/
static void rxrpc_start_call_timer(struct rxrpc_call *call)
{
ktime_t now = ktime_get_real(), expire_at;
unsigned long now = jiffies;
unsigned long j = now + MAX_JIFFY_OFFSET;
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);
call->ack_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;
}
/*

4
net/rxrpc/conn_client.c
View file

@ -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.

34
net/rxrpc/input.c
View file

@ -318,16 +318,18 @@ static bool 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, 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.
*/
@ -908,9 +923,20 @@ 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);

19
net/rxrpc/misc.c
View file

@ -20,34 +20,29 @@
*/
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,

2
net/rxrpc/recvmsg.c
View file

@ -163,7 +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);

59
net/rxrpc/sendmsg.c
View file

@ -158,6 +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;
@ -197,11 +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 */
@ -223,14 +224,12 @@ 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;
unsigned long now = jiffies, 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);
}
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);
@ -513,6 +512,19 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
return -EINVAL;
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:
return -EINVAL;
}
@ -577,11 +589,13 @@ 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 = {
.call.tx_total_len = -1,
.call.user_call_ID = 0,
.call.nr_timeouts = 0,
.abort_code = 0,
.command = RXRPC_CMD_SEND_DATA,
.exclusive = false,
@ -646,6 +660,31 @@ 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);
/* 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);
_debug("CALL %d USR %lx ST %d on CONN %p",
call->debug_id, call->user_call_ID, state, call->conn);

60
net/rxrpc/sysctl.c
View file

@ -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 */