[apple/xnu.git] / bsd / netinet / mptcp_timer.c

/*
 * Copyright (c) 2012-2017 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mcache.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>

#include <mach/sdt.h>

#include <netinet/mp_pcb.h>
#include <netinet/mptcp_var.h>
#include <netinet/mptcp_timer.h>
#include <netinet/mptcp_seq.h>

#include <kern/locks.h>

/*
 * MPTCP Retransmission Timer comes into play only when subflow level
 * data is acked, but Data ACK is not received. Time is in seconds.
 */
static u_int32_t mptcp_rto = 3;
SYSCTL_INT(_net_inet_mptcp, OID_AUTO, rto, CTLFLAG_RW | CTLFLAG_LOCKED,
    &mptcp_rto, 0, "MPTCP Retransmission Timeout");

static int mptcp_nrtos = 3;
SYSCTL_INT(_net_inet_mptcp, OID_AUTO, nrto, CTLFLAG_RW | CTLFLAG_LOCKED,
    &mptcp_rto, 0, "MPTCP Retransmissions");

/*
 * MPTCP connections timewait interval in seconds.
 */
static u_int32_t mptcp_tw = 60;
SYSCTL_INT(_net_inet_mptcp, OID_AUTO, tw, CTLFLAG_RW | CTLFLAG_LOCKED,
    &mptcp_tw, 0, "MPTCP Timewait Period");

#define TIMEVAL_TO_HZ(_tv_)     ((_tv_).tv_sec * hz + (_tv_).tv_usec / hz)

static int mptcp_cancel_urgency_timer(struct mptses *mpte);

static int
mptcp_timer_demux(struct mptses *mpte, uint32_t now_msecs)
{
	struct mptcb *mp_tp = NULL;
	mp_tp = mpte->mpte_mptcb;
	int resched_timer = 0;

	DTRACE_MPTCP2(timer, struct mptses *, mpte, struct mptcb *, mp_tp);

	switch (mp_tp->mpt_timer_vals) {
	case MPTT_REXMT:
		if (mp_tp->mpt_rxtstart == 0) {
			break;
		}
		if ((now_msecs - mp_tp->mpt_rxtstart) >
		    (mptcp_rto * hz)) {
			if (MPTCP_SEQ_GT(mp_tp->mpt_snduna, mp_tp->mpt_rtseq)) {
				mp_tp->mpt_timer_vals = 0;
				mp_tp->mpt_rtseq = 0;
				break;
			}
			mp_tp->mpt_rxtshift++;
			if (mp_tp->mpt_rxtshift > mptcp_nrtos) {
				mp_tp->mpt_softerror = ETIMEDOUT;
				DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
			} else {
				mp_tp->mpt_sndnxt = mp_tp->mpt_rtseq;
				os_log_info(mptcp_log_handle,
				    "%s: REXMT %d sndnxt %u\n",
				    __func__, mp_tp->mpt_rxtshift,
				    (uint32_t)mp_tp->mpt_sndnxt);
				mptcp_output(mpte);
			}
		} else {
			resched_timer = 1;
		}
		break;
	case MPTT_TW:
		/* Allows for break before make XXX */
		if (mp_tp->mpt_timewait == 0) {
			VERIFY(0);
		}
		if ((now_msecs - mp_tp->mpt_timewait) >
		    (mptcp_tw * hz)) {
			mp_tp->mpt_softerror = ETIMEDOUT;
			DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
		} else {
			resched_timer = 1;
		}
		break;
	case MPTT_FASTCLOSE:
		/* TODO XXX */
		break;
	default:
		break;
	}

	return resched_timer;
}

uint32_t
mptcp_timer(struct mppcbinfo *mppi)
{
	struct mppcb *mpp, *tmpp;
	struct timeval now;
	u_int32_t now_msecs;
	uint32_t resched_timer = 0;

	LCK_MTX_ASSERT(&mppi->mppi_lock, LCK_MTX_ASSERT_OWNED);

	microuptime(&now);
	now_msecs = TIMEVAL_TO_HZ(now);
	TAILQ_FOREACH_SAFE(mpp, &mppi->mppi_pcbs, mpp_entry, tmpp) {
		struct socket *mp_so;
		struct mptses *mpte;

		mp_so = mpp->mpp_socket;
		mpte = mptompte(mpp);
		socket_lock(mp_so, 1);

		VERIFY(mpp->mpp_flags & MPP_ATTACHED);

		if (mptcp_timer_demux(mpte, now_msecs)) {
			resched_timer = 1;
		}
		socket_unlock(mp_so, 1);
	}

	return resched_timer;
}

void
mptcp_start_timer(struct mptses *mpte, int timer_type)
{
	struct timeval now;
	struct mptcb *mp_tp = mpte->mpte_mptcb;

	microuptime(&now);

	DTRACE_MPTCP2(start__timer, struct mptcb *, mp_tp, int, timer_type);
	mptcplog((LOG_DEBUG, "MPTCP Socket: %s: %d\n", __func__, timer_type),
	    MPTCP_SOCKET_DBG, MPTCP_LOGLVL_VERBOSE);

	socket_lock_assert_owned(mptetoso(mpte));

	switch (timer_type) {
	case MPTT_REXMT:
		mp_tp->mpt_timer_vals |= MPTT_REXMT;
		mp_tp->mpt_rxtstart = TIMEVAL_TO_HZ(now);
		mp_tp->mpt_rxtshift = 0;
		mp_tp->mpt_rtseq = mp_tp->mpt_sndnxt;
		break;
	case MPTT_TW:
		/* XXX: Not implemented yet */
		mp_tp->mpt_timer_vals |= MPTT_TW;
		mp_tp->mpt_timewait = TIMEVAL_TO_HZ(now);
		break;
	case MPTT_FASTCLOSE:
		/* NO-OP */
		break;
	default:
		VERIFY(0);
		/* NOTREACHED */
	}
	mptcp_timer_sched();
}

void
mptcp_cancel_timer(struct mptcb *mp_tp, int timer_type)
{
	socket_lock_assert_owned(mptetoso(mp_tp->mpt_mpte));

	switch (timer_type) {
	case MPTT_REXMT:
		mp_tp->mpt_rxtstart = 0;
		mp_tp->mpt_rxtshift = 0;
		mp_tp->mpt_timer_vals = 0;
		break;
	case MPTT_TW:
		/* NO-OP */
		break;
	case MPTT_FASTCLOSE:
		/* NO-OP */
		break;
	default:
		break;
	}
}

void
mptcp_cancel_all_timers(struct mptcb *mp_tp)
{
	struct mptses *mpte = mp_tp->mpt_mpte;

	if (mpte->mpte_time_target) {
		mptcp_cancel_urgency_timer(mpte);
	}

	mptcp_cancel_timer(mp_tp, MPTT_REXMT);
	mptcp_cancel_timer(mp_tp, MPTT_TW);
	mptcp_cancel_timer(mp_tp, MPTT_FASTCLOSE);
}

static void
mptcp_urgency_timer_locked(struct mptses *mpte)
{
	uint64_t time_now = mach_continuous_time();
	struct socket *mp_so = mptetoso(mpte);

	VERIFY(mp_so->so_usecount >= 0);

	os_log(mptcp_log_handle, "%s - %lx: timer at %llu now %llu usecount %u\n",
	    __func__, (unsigned long)VM_KERNEL_ADDRPERM(mpte), mpte->mpte_time_target, time_now, mp_so->so_usecount);

	mptcp_check_subflows_and_add(mpte);

	mp_so->so_usecount--;
}

static void
mptcp_urgency_timer(void *param0, __unused void *param1)
{
	struct mptses *mpte = (struct mptses *)param0;
	struct socket *mp_so = mptetoso(mpte);

	socket_lock(mp_so, 1);

	mptcp_urgency_timer_locked(mpte);

	socket_unlock(mp_so, 1);
}

void
mptcp_init_urgency_timer(struct mptses *mpte)
{
	/* thread_call_allocate never fails */
	mpte->mpte_time_thread = thread_call_allocate(mptcp_urgency_timer, mpte);
}

void
mptcp_set_urgency_timer(struct mptses *mpte)
{
	struct socket *mp_so = mptetoso(mpte);
	uint64_t time_now = 0;
	boolean_t ret = FALSE;

	socket_lock_assert_owned(mp_so);

	VERIFY(mp_so->so_usecount >= 0);
	if (mp_so->so_usecount == 0) {
		goto exit_log;
	}

	if (mpte->mpte_time_target == 0) {
		mptcp_cancel_urgency_timer(mpte);

		goto exit_log;
	}

	time_now = mach_continuous_time();

	if ((int64_t)(mpte->mpte_time_target - time_now) > 0) {
		mptcp_check_subflows_and_remove(mpte);

		ret = thread_call_enter_delayed_with_leeway(mpte->mpte_time_thread, NULL,
		    mpte->mpte_time_target, 0, THREAD_CALL_CONTINUOUS);

		if (!ret) {
			mp_so->so_usecount++;
		}
	} else if ((int64_t)(mpte->mpte_time_target - time_now) <= 0) {
		mp_so->so_usecount++;

		/* Already passed the deadline, trigger subflows now */
		mptcp_urgency_timer_locked(mpte);
	}

exit_log:
	os_log(mptcp_log_handle, "%s - %lx: timer at %llu now %llu usecount %u ret %u\n",
	    __func__, (unsigned long)VM_KERNEL_ADDRPERM(mpte), mpte->mpte_time_target, time_now,
	    mp_so->so_usecount, ret);
}

static int
mptcp_cancel_urgency_timer(struct mptses *mpte)
{
	struct socket *mp_so = mptetoso(mpte);
	boolean_t ret;

	ret = thread_call_cancel(mpte->mpte_time_thread);

	os_log(mptcp_log_handle, "%s - %lx: Canceled timer thread usecount %u ret %u\n",
	    __func__, (unsigned long)VM_KERNEL_ADDRPERM(mpte), mp_so->so_usecount, ret);

	mptcp_check_subflows_and_remove(mpte);

	if (ret) {
		mp_so->so_usecount--;
	}

	return 0;
}
Commit	Line	Data
39236c6e	1	/*
5ba3f43e	2	* Copyright (c) 2012-2017 Apple Inc. All rights reserved.
39236c6e A	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	#include <sys/param.h>
	30	#include <sys/systm.h>
	31	#include <sys/kernel.h>
	32	#include <sys/mcache.h>
	33	#include <sys/socket.h>
	34	#include <sys/socketvar.h>
	35	#include <sys/syslog.h>
	36	#include <sys/protosw.h>
	37	#include <sys/sysctl.h>
	38
	39	#include <mach/sdt.h>
	40
	41	#include <netinet/mp_pcb.h>
	42	#include <netinet/mptcp_var.h>
	43	#include <netinet/mptcp_timer.h>
	44	#include <netinet/mptcp_seq.h>
	45
	46	#include <kern/locks.h>
	47
	48	/*
	49	* MPTCP Retransmission Timer comes into play only when subflow level
	50	* data is acked, but Data ACK is not received. Time is in seconds.
	51	*/
	52	static u_int32_t mptcp_rto = 3;
	53	SYSCTL_INT(_net_inet_mptcp, OID_AUTO, rto, CTLFLAG_RW \| CTLFLAG_LOCKED,
0a7de745	54	&mptcp_rto, 0, "MPTCP Retransmission Timeout");
39236c6e A	55
	56	static int mptcp_nrtos = 3;
	57	SYSCTL_INT(_net_inet_mptcp, OID_AUTO, nrto, CTLFLAG_RW \| CTLFLAG_LOCKED,
0a7de745	58	&mptcp_rto, 0, "MPTCP Retransmissions");
39236c6e A	59
	60	/*
	61	* MPTCP connections timewait interval in seconds.
	62	*/
	63	static u_int32_t mptcp_tw = 60;
	64	SYSCTL_INT(_net_inet_mptcp, OID_AUTO, tw, CTLFLAG_RW \| CTLFLAG_LOCKED,
0a7de745	65	&mptcp_tw, 0, "MPTCP Timewait Period");
39236c6e	66
0a7de745	67	#define TIMEVAL_TO_HZ(_tv_) ((_tv_).tv_sec * hz + (_tv_).tv_usec / hz)
39236c6e	68
cb323159 A	69	static int mptcp_cancel_urgency_timer(struct mptses *mpte);
cb323159 A	70
39236c6e A	71	static int
	72	mptcp_timer_demux(struct mptses *mpte, uint32_t now_msecs)
	73	{
	74	struct mptcb *mp_tp = NULL;
	75	mp_tp = mpte->mpte_mptcb;
	76	int resched_timer = 0;
	77
	78	DTRACE_MPTCP2(timer, struct mptses , mpte, struct mptcb , mp_tp);
39236c6e	79
39236c6e A	80	switch (mp_tp->mpt_timer_vals) {
39236c6e A	81	case MPTT_REXMT:
0a7de745	82	if (mp_tp->mpt_rxtstart == 0) {
39236c6e	83	break;
0a7de745	84	}
39236c6e	85	if ((now_msecs - mp_tp->mpt_rxtstart) >
0a7de745	86	(mptcp_rto * hz)) {
a39ff7e2	87	if (MPTCP_SEQ_GT(mp_tp->mpt_snduna, mp_tp->mpt_rtseq)) {
39236c6e A	88	mp_tp->mpt_timer_vals = 0;
	89	mp_tp->mpt_rtseq = 0;
	90	break;
	91	}
	92	mp_tp->mpt_rxtshift++;
	93	if (mp_tp->mpt_rxtshift > mptcp_nrtos) {
	94	mp_tp->mpt_softerror = ETIMEDOUT;
	95	DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
	96	} else {
	97	mp_tp->mpt_sndnxt = mp_tp->mpt_rtseq;
a39ff7e2	98	os_log_info(mptcp_log_handle,
0a7de745 A	99	"%s: REXMT %d sndnxt %u\n",
	100	__func__, mp_tp->mpt_rxtshift,
	101	(uint32_t)mp_tp->mpt_sndnxt);
39236c6e	102	mptcp_output(mpte);
39236c6e A	103	}
	104	} else {
	105	resched_timer = 1;
	106	}
	107	break;
	108	case MPTT_TW:
	109	/* Allows for break before make XXX */
0a7de745	110	if (mp_tp->mpt_timewait == 0) {
39236c6e	111	VERIFY(0);
0a7de745	112	}
39236c6e A	113	if ((now_msecs - mp_tp->mpt_timewait) >
	114	(mptcp_tw * hz)) {
	115	mp_tp->mpt_softerror = ETIMEDOUT;
	116	DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
	117	} else {
	118	resched_timer = 1;
	119	}
	120	break;
	121	case MPTT_FASTCLOSE:
	122	/* TODO XXX */
	123	break;
	124	default:
	125	break;
	126	}
39236c6e	127
0a7de745	128	return resched_timer;
39236c6e A	129	}
	130
	131	uint32_t
	132	mptcp_timer(struct mppcbinfo *mppi)
	133	{
	134	struct mppcb mpp, tmpp;
	135	struct timeval now;
	136	u_int32_t now_msecs;
	137	uint32_t resched_timer = 0;
	138
5ba3f43e	139	LCK_MTX_ASSERT(&mppi->mppi_lock, LCK_MTX_ASSERT_OWNED);
39236c6e A	140
	141	microuptime(&now);
	142	now_msecs = TIMEVAL_TO_HZ(now);
	143	TAILQ_FOREACH_SAFE(mpp, &mppi->mppi_pcbs, mpp_entry, tmpp) {
	144	struct socket *mp_so;
	145	struct mptses *mpte;
	146
	147	mp_so = mpp->mpp_socket;
39236c6e	148	mpte = mptompte(mpp);
cb323159 A	149	socket_lock(mp_so, 1);
cb323159 A	150
39236c6e	151	VERIFY(mpp->mpp_flags & MPP_ATTACHED);
39037602	152
0a7de745	153	if (mptcp_timer_demux(mpte, now_msecs)) {
39236c6e	154	resched_timer = 1;
0a7de745	155	}
cb323159	156	socket_unlock(mp_so, 1);
39236c6e A	157	}
39236c6e A	158
0a7de745	159	return resched_timer;
39236c6e A	160	}
	161
	162	void
3e170ce0	163	mptcp_start_timer(struct mptses *mpte, int timer_type)
39236c6e A	164	{
39236c6e A	165	struct timeval now;
3e170ce0	166	struct mptcb *mp_tp = mpte->mpte_mptcb;
39236c6e A	167
	168	microuptime(&now);
	169
39236c6e	170	DTRACE_MPTCP2(start__timer, struct mptcb *, mp_tp, int, timer_type);
3e170ce0 A	171	mptcplog((LOG_DEBUG, "MPTCP Socket: %s: %d\n", __func__, timer_type),
3e170ce0 A	172	MPTCP_SOCKET_DBG, MPTCP_LOGLVL_VERBOSE);
39236c6e	173
cb323159	174	socket_lock_assert_owned(mptetoso(mpte));
5ba3f43e	175
39236c6e A	176	switch (timer_type) {
	177	case MPTT_REXMT:
	178	mp_tp->mpt_timer_vals \|= MPTT_REXMT;
	179	mp_tp->mpt_rxtstart = TIMEVAL_TO_HZ(now);
	180	mp_tp->mpt_rxtshift = 0;
	181	mp_tp->mpt_rtseq = mp_tp->mpt_sndnxt;
	182	break;
	183	case MPTT_TW:
3e170ce0	184	/* XXX: Not implemented yet */
39236c6e A	185	mp_tp->mpt_timer_vals \|= MPTT_TW;
	186	mp_tp->mpt_timewait = TIMEVAL_TO_HZ(now);
	187	break;
	188	case MPTT_FASTCLOSE:
	189	/* NO-OP */
	190	break;
	191	default:
	192	VERIFY(0);
	193	/* NOTREACHED */
	194	}
	195	mptcp_timer_sched();
	196	}
	197
	198	void
	199	mptcp_cancel_timer(struct mptcb *mp_tp, int timer_type)
	200	{
cb323159	201	socket_lock_assert_owned(mptetoso(mp_tp->mpt_mpte));
39236c6e A	202
	203	switch (timer_type) {
	204	case MPTT_REXMT:
	205	mp_tp->mpt_rxtstart = 0;
	206	mp_tp->mpt_rxtshift = 0;
	207	mp_tp->mpt_timer_vals = 0;
	208	break;
	209	case MPTT_TW:
	210	/* NO-OP */
	211	break;
	212	case MPTT_FASTCLOSE:
	213	/* NO-OP */
	214	break;
	215	default:
	216	break;
	217	}
	218	}
	219
	220	void
	221	mptcp_cancel_all_timers(struct mptcb *mp_tp)
	222	{
cb323159 A	223	struct mptses *mpte = mp_tp->mpt_mpte;
	224
	225	if (mpte->mpte_time_target) {
	226	mptcp_cancel_urgency_timer(mpte);
	227	}
	228
39236c6e A	229	mptcp_cancel_timer(mp_tp, MPTT_REXMT);
	230	mptcp_cancel_timer(mp_tp, MPTT_TW);
	231	mptcp_cancel_timer(mp_tp, MPTT_FASTCLOSE);
	232	}
cb323159 A	233
	234	static void
	235	mptcp_urgency_timer_locked(struct mptses *mpte)
	236	{
	237	uint64_t time_now = mach_continuous_time();
	238	struct socket *mp_so = mptetoso(mpte);
	239
	240	VERIFY(mp_so->so_usecount >= 0);
	241
	242	os_log(mptcp_log_handle, "%s - %lx: timer at %llu now %llu usecount %u\n",
	243	__func__, (unsigned long)VM_KERNEL_ADDRPERM(mpte), mpte->mpte_time_target, time_now, mp_so->so_usecount);
	244
	245	mptcp_check_subflows_and_add(mpte);
	246
	247	mp_so->so_usecount--;
	248	}
	249
	250	static void
	251	mptcp_urgency_timer(void param0, __unused void param1)
	252	{
	253	struct mptses mpte = (struct mptses )param0;
	254	struct socket *mp_so = mptetoso(mpte);
	255
	256	socket_lock(mp_so, 1);
	257
	258	mptcp_urgency_timer_locked(mpte);
	259
	260	socket_unlock(mp_so, 1);
	261	}
	262
	263	void
	264	mptcp_init_urgency_timer(struct mptses *mpte)
	265	{
	266	/* thread_call_allocate never fails */
	267	mpte->mpte_time_thread = thread_call_allocate(mptcp_urgency_timer, mpte);
	268	}
	269
	270	void
	271	mptcp_set_urgency_timer(struct mptses *mpte)
	272	{
	273	struct socket *mp_so = mptetoso(mpte);
	274	uint64_t time_now = 0;
	275	boolean_t ret = FALSE;
	276
	277	socket_lock_assert_owned(mp_so);
	278
	279	VERIFY(mp_so->so_usecount >= 0);
	280	if (mp_so->so_usecount == 0) {
	281	goto exit_log;
	282	}
	283
	284	if (mpte->mpte_time_target == 0) {
	285	mptcp_cancel_urgency_timer(mpte);
	286
	287	goto exit_log;
	288	}
	289
	290	time_now = mach_continuous_time();
	291
	292	if ((int64_t)(mpte->mpte_time_target - time_now) > 0) {
	293	mptcp_check_subflows_and_remove(mpte);
	294
	295	ret = thread_call_enter_delayed_with_leeway(mpte->mpte_time_thread, NULL,
	296	mpte->mpte_time_target, 0, THREAD_CALL_CONTINUOUS);
297
298	if (!ret) {
299	mp_so->so_usecount++;
300	}
301	} else if ((int64_t)(mpte->mpte_time_target - time_now) <= 0) {
302	mp_so->so_usecount++;
303
304	/* Already passed the deadline, trigger subflows now */
305	mptcp_urgency_timer_locked(mpte);
306	}
307
308	exit_log:
309	os_log(mptcp_log_handle, "%s - %lx: timer at %llu now %llu usecount %u ret %u\n",
310	__func__, (unsigned long)VM_KERNEL_ADDRPERM(mpte), mpte->mpte_time_target, time_now,
311	mp_so->so_usecount, ret);
312	}
313
314	static int
315	mptcp_cancel_urgency_timer(struct mptses *mpte)
316	{
317	struct socket *mp_so = mptetoso(mpte);
318	boolean_t ret;
319
320	ret = thread_call_cancel(mpte->mpte_time_thread);
321
322	os_log(mptcp_log_handle, "%s - %lx: Canceled timer thread usecount %u ret %u\n",
323	__func__, (unsigned long)VM_KERNEL_ADDRPERM(mpte), mp_so->so_usecount, ret);
324
325	mptcp_check_subflows_and_remove(mpte);
326
327	if (ret) {
328	mp_so->so_usecount--;
329	}
330
331	return 0;
332	}