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[src/trunk]: src/sys Avoid having a rtcache directly in a percpu storage for ...
details: https://anonhg.NetBSD.org/src/rev/97e0cc218144
branches: trunk
changeset: 459636:97e0cc218144
user: knakahara <knakahara%NetBSD.org@localhost>
date: Thu Sep 19 06:07:24 2019 +0000
description:
Avoid having a rtcache directly in a percpu storage for tunnel protocols.
percpu(9) has a certain memory storage for each CPU and provides it by the piece
to users. If the storages went short, percpu(9) enlarges them by allocating new
larger memory areas, replacing old ones with them and destroying the old ones.
A percpu storage referenced by a pointer gotten via percpu_getref can be
destroyed by the mechanism after a running thread sleeps even if percpu_putref
has not been called.
Using rtcache, i.e., packet processing, typically involves sleepable operations
such as rwlock so we must avoid dereferencing a rtcache that is directly stored
in a percpu storage during packet processing. Address this situation by having
just a pointer to a rtcache in a percpu storage instead.
Reviewed by ozaki-r@ and yamaguchi@
diffstat:
sys/net/if.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++-
sys/net/if.h | 29 ++++++++++++++++++++++-
sys/net/if_gif.c | 39 +++----------------------------
sys/net/if_gif.h | 15 +++--------
sys/net/if_ipsec.c | 31 +++---------------------
sys/net/if_ipsec.h | 11 ++------
sys/net/if_l2tp.c | 31 +++---------------------
sys/net/if_l2tp.h | 11 ++------
sys/netinet/in_gif.c | 33 +++++++++++---------------
sys/netinet/in_l2tp.c | 30 +++++++++++------------
sys/netinet6/in6_gif.c | 46 ++++++++++++++++--------------------
sys/netinet6/in6_l2tp.c | 29 ++++++++++------------
sys/netipsec/ipsecif.c | 56 ++++++++++++++++----------------------------
13 files changed, 192 insertions(+), 230 deletions(-)
diffs (truncated from 962 to 300 lines):
diff -r b2f484d17190 -r 97e0cc218144 sys/net/if.c
--- a/sys/net/if.c Thu Sep 19 05:31:50 2019 +0000
+++ b/sys/net/if.c Thu Sep 19 06:07:24 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: if.c,v 1.460 2019/09/13 07:55:07 msaitoh Exp $ */
+/* $NetBSD: if.c,v 1.461 2019/09/19 06:07:24 knakahara Exp $ */
/*-
* Copyright (c) 1999, 2000, 2001, 2008 The NetBSD Foundation, Inc.
@@ -90,7 +90,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.460 2019/09/13 07:55:07 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.461 2019/09/19 06:07:24 knakahara Exp $");
#if defined(_KERNEL_OPT)
#include "opt_inet.h"
@@ -2906,6 +2906,63 @@
return 0;
}
+static void
+if_tunnel_ro_init_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
+{
+ struct tunnel_ro *tro = p;
+
+ tro->tr_ro = kmem_zalloc(sizeof(*tro->tr_ro), KM_SLEEP);
+ tro->tr_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
+}
+
+percpu_t *
+if_tunnel_alloc_ro_percpu(void)
+{
+ percpu_t *ro_percpu;
+
+ ro_percpu = percpu_alloc(sizeof(struct tunnel_ro));
+ percpu_foreach(ro_percpu, if_tunnel_ro_init_pc, NULL);
+
+ return ro_percpu;
+}
+
+static void
+if_tunnel_ro_fini_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
+{
+ struct tunnel_ro *tro = p;
+
+ rtcache_free(tro->tr_ro);
+ kmem_free(tro->tr_ro, sizeof(*tro->tr_ro));
+
+ mutex_obj_free(tro->tr_lock);
+}
+
+void
+if_tunnel_free_ro_percpu(percpu_t *ro_percpu)
+{
+
+ percpu_foreach(ro_percpu, if_tunnel_ro_fini_pc, NULL);
+ percpu_free(ro_percpu, sizeof(struct tunnel_ro));
+}
+
+
+static void
+if_tunnel_rtcache_free_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
+{
+ struct tunnel_ro *tro = p;
+
+ mutex_enter(tro->tr_lock);
+ rtcache_free(tro->tr_ro);
+ mutex_exit(tro->tr_lock);
+}
+
+void if_tunnel_ro_percpu_rtcache_free(percpu_t *ro_percpu)
+{
+
+ percpu_foreach(ro_percpu, if_tunnel_rtcache_free_pc, NULL);
+}
+
+
/* common */
int
ifioctl_common(struct ifnet *ifp, u_long cmd, void *data)
diff -r b2f484d17190 -r 97e0cc218144 sys/net/if.h
--- a/sys/net/if.h Thu Sep 19 05:31:50 2019 +0000
+++ b/sys/net/if.h Thu Sep 19 06:07:24 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: if.h,v 1.276 2019/09/13 07:55:07 msaitoh Exp $ */
+/* $NetBSD: if.h,v 1.277 2019/09/19 06:07:24 knakahara Exp $ */
/*-
* Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
@@ -1122,6 +1122,33 @@
#define if_release if_put
int if_tunnel_check_nesting(struct ifnet *, struct mbuf *, int);
+percpu_t *if_tunnel_alloc_ro_percpu(void);
+void if_tunnel_free_ro_percpu(percpu_t *);
+void if_tunnel_ro_percpu_rtcache_free(percpu_t *);
+
+struct tunnel_ro {
+ struct route *tr_ro;
+ kmutex_t *tr_lock;
+};
+
+static inline void
+if_tunnel_get_ro(percpu_t *ro_percpu, struct route **ro, kmutex_t **lock)
+{
+ struct tunnel_ro *tro;
+
+ tro = percpu_getref(ro_percpu);
+ *ro = tro->tr_ro;
+ *lock = tro->tr_lock;
+ mutex_enter(*lock);
+}
+
+static inline void
+if_tunnel_put_ro(percpu_t *ro_percpu, kmutex_t *lock)
+{
+
+ mutex_exit(lock);
+ percpu_putref(ro_percpu);
+}
static __inline if_index_t
if_get_index(const struct ifnet *ifp)
diff -r b2f484d17190 -r 97e0cc218144 sys/net/if_gif.c
--- a/sys/net/if_gif.c Thu Sep 19 05:31:50 2019 +0000
+++ b/sys/net/if_gif.c Thu Sep 19 06:07:24 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: if_gif.c,v 1.148 2019/06/25 12:30:50 msaitoh Exp $ */
+/* $NetBSD: if_gif.c,v 1.149 2019/09/19 06:07:24 knakahara Exp $ */
/* $KAME: if_gif.c,v 1.76 2001/08/20 02:01:02 kjc Exp $ */
/*
@@ -31,7 +31,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_gif.c,v 1.148 2019/06/25 12:30:50 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_gif.c,v 1.149 2019/09/19 06:07:24 knakahara Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@@ -104,9 +104,6 @@
struct psref_class *gv_psref_class __read_mostly;
-static void gif_ro_init_pc(void *, void *, struct cpu_info *);
-static void gif_ro_fini_pc(void *, void *, struct cpu_info *);
-
static int gifattach0(struct gif_softc *);
static int gif_output(struct ifnet *, struct mbuf *,
const struct sockaddr *, const struct rtentry *);
@@ -271,8 +268,7 @@
mutex_init(&sc->gif_lock, MUTEX_DEFAULT, IPL_NONE);
sc->gif_psz = pserialize_create();
- sc->gif_ro_percpu = percpu_alloc(sizeof(struct gif_ro));
- percpu_foreach(sc->gif_ro_percpu, gif_ro_init_pc, NULL);
+ sc->gif_ro_percpu = if_tunnel_alloc_ro_percpu();
mutex_enter(&gif_softcs.lock);
LIST_INSERT_HEAD(&gif_softcs.list, sc, gif_list);
mutex_exit(&gif_softcs.lock);
@@ -309,32 +305,6 @@
return 0;
}
-static void
-gif_ro_init_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
-{
- struct gif_ro *gro = p;
-
- gro->gr_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
-}
-
-static void
-gif_ro_fini_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
-{
- struct gif_ro *gro = p;
-
- rtcache_free(&gro->gr_ro);
-
- mutex_obj_free(gro->gr_lock);
-}
-
-void
-gif_rtcache_free_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
-{
- struct gif_ro *gro = p;
-
- rtcache_free(&gro->gr_ro);
-}
-
static int
gif_clone_destroy(struct ifnet *ifp)
{
@@ -347,8 +317,7 @@
bpf_detach(ifp);
if_detach(ifp);
- percpu_foreach(sc->gif_ro_percpu, gif_ro_fini_pc, NULL);
- percpu_free(sc->gif_ro_percpu, sizeof(struct gif_ro));
+ if_tunnel_free_ro_percpu(sc->gif_ro_percpu);
pserialize_destroy(sc->gif_psz);
mutex_destroy(&sc->gif_lock);
diff -r b2f484d17190 -r 97e0cc218144 sys/net/if_gif.h
--- a/sys/net/if_gif.h Thu Sep 19 05:31:50 2019 +0000
+++ b/sys/net/if_gif.h Thu Sep 19 06:07:24 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: if_gif.h,v 1.32 2018/10/19 00:12:56 knakahara Exp $ */
+/* $NetBSD: if_gif.h,v 1.33 2019/09/19 06:07:24 knakahara Exp $ */
/* $KAME: if_gif.h,v 1.23 2001/07/27 09:21:42 itojun Exp $ */
/*
@@ -55,11 +55,6 @@
struct encaptab;
-struct gif_ro {
- struct route gr_ro;
- kmutex_t *gr_lock;
-};
-
struct gif_variant {
struct gif_softc *gv_softc;
struct sockaddr *gv_psrc; /* Physical src addr */
@@ -73,7 +68,7 @@
struct gif_softc {
struct ifnet gif_if; /* common area - must be at the top */
- percpu_t *gif_ro_percpu; /* struct gif_ro */
+ percpu_t *gif_ro_percpu; /* struct tunnel_ro */
struct gif_variant *gif_var; /*
* reader must use gif_getref_variant()
* instead of direct dereference.
@@ -131,8 +126,6 @@
/* Prototypes */
void gif_input(struct mbuf *, int, struct ifnet *);
-void gif_rtcache_free_pc(void *, void *, struct cpu_info *);
-
#ifdef GIF_ENCAPCHECK
int gif_encapcheck(struct mbuf *, int, int, void *);
#endif
@@ -147,8 +140,8 @@
* - gif_var->gv_psref for reader
* gif_softc->gif_var is used for variant values while the gif tunnel
* exists.
- * + Each CPU's gif_ro.gr_ro of gif_ro_percpu are protected by
- * percpu'ed gif_ro.gr_lock.
+ * + Each CPU's tunnel_ro.tr_ro of gif_ro_percpu are protected by
+ * percpu'ed tunnel_ro.tr_lock.
*
* Locking order:
* - encap_lock => gif_softc->gif_lock => gif_softcs.lock
diff -r b2f484d17190 -r 97e0cc218144 sys/net/if_ipsec.c
--- a/sys/net/if_ipsec.c Thu Sep 19 05:31:50 2019 +0000
+++ b/sys/net/if_ipsec.c Thu Sep 19 06:07:24 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: if_ipsec.c,v 1.23 2019/09/13 07:55:07 msaitoh Exp $ */
+/* $NetBSD: if_ipsec.c,v 1.24 2019/09/19 06:07:24 knakahara Exp $ */
/*
* Copyright (c) 2017 Internet Initiative Japan Inc.
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_ipsec.c,v 1.23 2019/09/13 07:55:07 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_ipsec.c,v 1.24 2019/09/19 06:07:24 knakahara Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@@ -80,9 +80,6 @@
#include <netipsec/ipsec.h>
#include <netipsec/ipsecif.h>
-static void if_ipsec_ro_init_pc(void *, void *, struct cpu_info *);
-static void if_ipsec_ro_fini_pc(void *, void *, struct cpu_info *);
-
static int if_ipsec_clone_create(struct if_clone *, int);
static int if_ipsec_clone_destroy(struct ifnet *);
@@ -182,8 +179,7 @@
sc->ipsec_var = var;
mutex_init(&sc->ipsec_lock, MUTEX_DEFAULT, IPL_NONE);
sc->ipsec_psz = pserialize_create();
- sc->ipsec_ro_percpu = percpu_alloc(sizeof(struct ipsec_ro));
- percpu_foreach(sc->ipsec_ro_percpu, if_ipsec_ro_init_pc, NULL);
+ sc->ipsec_ro_percpu = if_tunnel_alloc_ro_percpu();
mutex_enter(&ipsec_softcs.lock);
LIST_INSERT_HEAD(&ipsec_softcs.list, sc, ipsec_list);
@@ -213,24 +209,6 @@
if_register(&sc->ipsec_if);
}
-static void
-if_ipsec_ro_init_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
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