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[src/netbsd-8]: src/sys Pull up following revision(s) (requested by ozaki-r i...
details: https://anonhg.NetBSD.org/src/rev/d4711ca72c0c
branches: netbsd-8
changeset: 851328:d4711ca72c0c
user: snj <snj%NetBSD.org@localhost>
date: Sat Feb 03 22:07:26 2018 +0000
description:
Pull up following revision(s) (requested by ozaki-r in ticket #514):
sys/net/route.c: 1.205
sys/net/rtsock.c: 1.237-1.238
sys/netinet/in.c: 1.215
sys/netinet/tcp_subr.c: 1.272
sys/netinet/tcp_timer.c: 1.93
sys/netinet/tcp_timer.h: 1.29
sys/netinet/tcp_var.h: 1.182
sys/netinet6/in6.c: 1.258
Remove extra pserialize_perform from in_purgeaddr
It's already performed in ifa_remove. Note so there (in in6_unlink_ifa too).
Release rt_so_mtx on updating a rtentry to avoid a deadlock with route_intr
The deadlock happened only if NET_MPSAFE on.
Run tcp_slowtimo in workqueue if NET_MPSAFE
If NET_MPSAFE is enabled, we have to avoid taking softnet_lock in softint as
much as possible to prevent any softint handlers including callout handlers
such as tcp_slowtimo from sticking on softnet_lock because it results in
undesired delays of executing subsequent softint handlers.
NFCI for !NET_MPSAFE
Fix a return value of rt_update_prepare
Callers expect it to be an errno.
Fix another deadlock
When waiting for a route update to finish, a waiter has to release its reference
to the route to avoid a deadlock. Because a updater tries to wait for references
to a target route (except for a reference by the updater itself) to be released.
diffstat:
sys/net/route.c | 6 +++---
sys/net/rtsock.c | 36 ++++++++++++++++++++++++++++++++++--
sys/netinet/in.c | 8 +++-----
sys/netinet/tcp_subr.c | 9 +++------
sys/netinet/tcp_timer.c | 46 ++++++++++++++++++++++++++++++++++++++++++----
sys/netinet/tcp_timer.h | 3 ++-
sys/netinet/tcp_var.h | 4 +---
sys/netinet6/in6.c | 5 +++--
8 files changed, 91 insertions(+), 26 deletions(-)
diffs (truncated from 336 to 300 lines):
diff -r fda430895d3d -r d4711ca72c0c sys/net/route.c
--- a/sys/net/route.c Sat Feb 03 22:02:02 2018 +0000
+++ b/sys/net/route.c Sat Feb 03 22:07:26 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: route.c,v 1.194.6.4 2018/01/13 22:10:55 snj Exp $ */
+/* $NetBSD: route.c,v 1.194.6.5 2018/02/03 22:07:26 snj Exp $ */
/*-
* Copyright (c) 1998, 2008 The NetBSD Foundation, Inc.
@@ -97,7 +97,7 @@
#endif
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: route.c,v 1.194.6.4 2018/01/13 22:10:55 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: route.c,v 1.194.6.5 2018/02/03 22:07:26 snj Exp $");
#include <sys/param.h>
#ifdef RTFLUSH_DEBUG
@@ -747,7 +747,7 @@
/* If the entry is being destroyed, don't proceed the update. */
if (!ISSET(rt->rt_flags, RTF_UP)) {
RT_UNLOCK();
- return -1;
+ return ESRCH;
}
rt->rt_flags |= RTF_UPDATING;
RT_UNLOCK();
diff -r fda430895d3d -r d4711ca72c0c sys/net/rtsock.c
--- a/sys/net/rtsock.c Sat Feb 03 22:02:02 2018 +0000
+++ b/sys/net/rtsock.c Sat Feb 03 22:07:26 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: rtsock.c,v 1.213.2.5 2018/01/02 10:30:10 snj Exp $ */
+/* $NetBSD: rtsock.c,v 1.213.2.6 2018/02/03 22:07:26 snj Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -61,7 +61,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rtsock.c,v 1.213.2.5 2018/01/02 10:30:10 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rtsock.c,v 1.213.2.6 2018/02/03 22:07:26 snj Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@@ -82,6 +82,7 @@
#include <sys/kauth.h>
#include <sys/kmem.h>
#include <sys/intr.h>
+#include <sys/condvar.h>
#include <net/if.h>
#include <net/if_llatbl.h>
@@ -187,6 +188,9 @@
static struct rawcbhead rt_rawcb;
#ifdef NET_MPSAFE
static kmutex_t *rt_so_mtx;
+
+static bool rt_updating = false;
+static kcondvar_t rt_update_cv;
#endif
static void
@@ -1002,11 +1006,37 @@
case RTM_CHANGE:
#ifdef NET_MPSAFE
+ /*
+ * Release rt_so_mtx to avoid a deadlock with route_intr
+ * and also serialize updating routes to avoid another.
+ */
+ if (rt_updating) {
+ /* Release to allow the updater to proceed */
+ rt_unref(rt);
+ rt = NULL;
+ }
+ while (rt_updating) {
+ error = cv_wait_sig(&rt_update_cv, rt_so_mtx);
+ if (error != 0)
+ goto flush;
+ }
+ if (rt == NULL) {
+ error = rtrequest1(RTM_GET, &info, &rt);
+ if (error != 0)
+ goto flush;
+ }
+ rt_updating = true;
+ mutex_exit(rt_so_mtx);
+
error = rt_update_prepare(rt);
if (error == 0) {
error = route_output_change(rt, &info, rtm);
rt_update_finish(rt);
}
+
+ mutex_enter(rt_so_mtx);
+ rt_updating = false;
+ cv_broadcast(&rt_update_cv);
#else
error = route_output_change(rt, &info, rtm);
#endif
@@ -2105,6 +2135,8 @@
#endif
#ifdef NET_MPSAFE
rt_so_mtx = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
+
+ cv_init(&rt_update_cv, "rtsock_cv");
#endif
sysctl_net_route_setup(NULL);
diff -r fda430895d3d -r d4711ca72c0c sys/netinet/in.c
--- a/sys/netinet/in.c Sat Feb 03 22:02:02 2018 +0000
+++ b/sys/netinet/in.c Sat Feb 03 22:07:26 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: in.c,v 1.203.2.6 2018/01/13 05:45:06 snj Exp $ */
+/* $NetBSD: in.c,v 1.203.2.7 2018/02/03 22:07:26 snj Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -91,7 +91,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: in.c,v 1.203.2.6 2018/01/13 05:45:06 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: in.c,v 1.203.2.7 2018/02/03 22:07:26 snj Exp $");
#include "arp.h"
@@ -855,9 +855,7 @@
TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list);
IN_ADDRLIST_WRITER_REMOVE(ia);
ifa_remove(ifp, &ia->ia_ifa);
-#ifdef NET_MPSAFE
- pserialize_perform(in_ifaddrhash_psz);
-#endif
+ /* Assume ifa_remove called pserialize_perform and psref_destroy */
mutex_exit(&in_ifaddr_lock);
IN_ADDRHASH_ENTRY_DESTROY(ia);
IN_ADDRLIST_ENTRY_DESTROY(ia);
diff -r fda430895d3d -r d4711ca72c0c sys/netinet/tcp_subr.c
--- a/sys/netinet/tcp_subr.c Sat Feb 03 22:02:02 2018 +0000
+++ b/sys/netinet/tcp_subr.c Sat Feb 03 22:07:26 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tcp_subr.c,v 1.270 2017/03/03 07:13:06 ozaki-r Exp $ */
+/* $NetBSD: tcp_subr.c,v 1.270.6.1 2018/02/03 22:07:26 snj Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -91,7 +91,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tcp_subr.c,v 1.270 2017/03/03 07:13:06 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tcp_subr.c,v 1.270.6.1 2018/02/03 22:07:26 snj Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@@ -388,8 +388,6 @@
struct mowner tcp_sock_tx_mowner = MOWNER_INIT("tcp", "sock tx");
#endif
-callout_t tcp_slowtimo_ch;
-
static int
do_tcpinit(void)
{
@@ -430,8 +428,7 @@
vtw_earlyinit();
- callout_init(&tcp_slowtimo_ch, CALLOUT_MPSAFE);
- callout_reset(&tcp_slowtimo_ch, 1, tcp_slowtimo, NULL);
+ tcp_slowtimo_init();
return 0;
}
diff -r fda430895d3d -r d4711ca72c0c sys/netinet/tcp_timer.c
--- a/sys/netinet/tcp_timer.c Sat Feb 03 22:02:02 2018 +0000
+++ b/sys/netinet/tcp_timer.c Sat Feb 03 22:07:26 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tcp_timer.c,v 1.91 2016/07/25 00:10:38 knakahara Exp $ */
+/* $NetBSD: tcp_timer.c,v 1.91.8.1 2018/02/03 22:07:26 snj Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -93,11 +93,12 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tcp_timer.c,v 1.91 2016/07/25 00:10:38 knakahara Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tcp_timer.c,v 1.91.8.1 2018/02/03 22:07:26 snj Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_tcp_debug.h"
+#include "opt_net_mpsafe.h"
#endif
#include <sys/param.h>
@@ -108,6 +109,8 @@
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/kernel.h>
+#include <sys/callout.h>
+#include <sys/workqueue.h>
#include <net/if.h>
@@ -149,6 +152,15 @@
int tcp_maxpersistidle = 0; /* max idle time in persist */
+static callout_t tcp_slowtimo_ch;
+#ifdef NET_MPSAFE
+static struct workqueue *tcp_slowtimo_wq;
+static struct work tcp_slowtimo_wk;
+#endif
+
+static void tcp_slowtimo_work(struct work *, void *);
+static void tcp_slowtimo(void *);
+
/*
* Time to delay the ACK. This is initialized in tcp_init(), unless
* its patched.
@@ -193,6 +205,21 @@
tcp_delack_ticks = TCP_DELACK_TICKS;
}
+void
+tcp_slowtimo_init(void)
+{
+#ifdef NET_MPSAFE
+ int error;
+
+ error = workqueue_create(&tcp_slowtimo_wq, "tcp_slowtimo",
+ tcp_slowtimo_work, NULL, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE);
+ if (error != 0)
+ panic("%s: workqueue_create failed (%d)\n", __func__, error);
+#endif
+ callout_init(&tcp_slowtimo_ch, CALLOUT_MPSAFE);
+ callout_reset(&tcp_slowtimo_ch, 1, tcp_slowtimo, NULL);
+}
+
/*
* Callout to process delayed ACKs for a TCPCB.
*/
@@ -229,8 +256,8 @@
* Updates the timers in all active tcb's and
* causes finite state machine actions if timers expire.
*/
-void
-tcp_slowtimo(void *arg)
+static void
+tcp_slowtimo_work(struct work *wk, void *arg)
{
mutex_enter(softnet_lock);
@@ -241,6 +268,17 @@
callout_schedule(&tcp_slowtimo_ch, hz / PR_SLOWHZ);
}
+static void
+tcp_slowtimo(void *arg)
+{
+
+#ifdef NET_MPSAFE
+ workqueue_enqueue(tcp_slowtimo_wq, &tcp_slowtimo_wk, NULL);
+#else
+ tcp_slowtimo_work(NULL, NULL);
+#endif
+}
+
/*
* Cancel all timers for TCP tp.
*/
diff -r fda430895d3d -r d4711ca72c0c sys/netinet/tcp_timer.h
--- a/sys/netinet/tcp_timer.h Sat Feb 03 22:02:02 2018 +0000
+++ b/sys/netinet/tcp_timer.h Sat Feb 03 22:07:26 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tcp_timer.h,v 1.28 2011/05/24 18:37:52 gdt Exp $ */
+/* $NetBSD: tcp_timer.h,v 1.28.48.1 2018/02/03 22:07:26 snj Exp $ */
/*-
* Copyright (c) 2001, 2005 The NetBSD Foundation, Inc.
@@ -190,6 +190,7 @@
extern const int tcp_backoff[];
void tcp_timer_init(void);
+void tcp_slowtimo_init(void);
#endif
#endif /* !_NETINET_TCP_TIMER_H_ */
diff -r fda430895d3d -r d4711ca72c0c sys/netinet/tcp_var.h
--- a/sys/netinet/tcp_var.h Sat Feb 03 22:02:02 2018 +0000
+++ b/sys/netinet/tcp_var.h Sat Feb 03 22:07:26 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tcp_var.h,v 1.177.10.1 2017/10/21 19:43:54 snj Exp $ */
+/* $NetBSD: tcp_var.h,v 1.177.10.2 2018/02/03 22:07:26 snj Exp $ */
/*
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