From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: netfilter-devel@vger.kernel.org, netdev@vger.kernel.org, oleg@redhat.com, akpm@linux-foundation.org, mingo@redhat.com, dave@stgolabs.net, manfred@colorfullife.com, tj@kernel.org, arnd@arndb.de, linux-arch@vger.kernel.org, will.deacon@arm.com, peterz@infradead.org, stern@rowland.harvard.edu, parri.andrea@gmail.com, torvalds@linux-foundation.org, <stable@vger.kernel.org>, Sasha Levin <sasha.levin@oracle.com>, Pablo Neira Ayuso <pablo@netfilter.org>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Subject: [PATCH v2 1/9] net/netfilter/nf_conntrack_core: Fix net_conntrack_lock() Date: Wed, 5 Jul 2017 16:31:35 -0700 [thread overview] Message-ID: <1499297503-23852-1-git-send-email-paulmck@linux.vnet.ibm.com> (raw) In-Reply-To: <20170705232955.GA15992@linux.vnet.ibm.com> From: Manfred Spraul <manfred@colorfullife.com> As we want to remove spin_unlock_wait() and replace it with explicit spin_lock()/spin_unlock() calls, we can use this to simplify the locking. In addition: - Reading nf_conntrack_locks_all needs ACQUIRE memory ordering. - The new code avoids the backwards loop. Only slightly tested, I did not manage to trigger calls to nf_conntrack_all_lock(). Fixes: b16c29191dc8 Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Cc: <stable@vger.kernel.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Pablo Neira Ayuso <pablo@netfilter.org> Cc: netfilter-devel@vger.kernel.org Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> --- net/netfilter/nf_conntrack_core.c | 44 +++++++++++++++++++++------------------ 1 file changed, 24 insertions(+), 20 deletions(-) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index e847dbaa0c6b..1193565c38ae 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -96,19 +96,24 @@ static struct conntrack_gc_work conntrack_gc_work; void nf_conntrack_lock(spinlock_t *lock) __acquires(lock) { + /* 1) Acquire the lock */ spin_lock(lock); - while (unlikely(nf_conntrack_locks_all)) { - spin_unlock(lock); - /* - * Order the 'nf_conntrack_locks_all' load vs. the - * spin_unlock_wait() loads below, to ensure - * that 'nf_conntrack_locks_all_lock' is indeed held: - */ - smp_rmb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ - spin_unlock_wait(&nf_conntrack_locks_all_lock); - spin_lock(lock); - } + /* 2) read nf_conntrack_locks_all, with ACQUIRE semantics */ + if (likely(smp_load_acquire(&nf_conntrack_locks_all) == false)) + return; + + /* fast path failed, unlock */ + spin_unlock(lock); + + /* Slow path 1) get global lock */ + spin_lock(&nf_conntrack_locks_all_lock); + + /* Slow path 2) get the lock we want */ + spin_lock(lock); + + /* Slow path 3) release the global lock */ + spin_unlock(&nf_conntrack_locks_all_lock); } EXPORT_SYMBOL_GPL(nf_conntrack_lock); @@ -149,18 +154,17 @@ static void nf_conntrack_all_lock(void) int i; spin_lock(&nf_conntrack_locks_all_lock); - nf_conntrack_locks_all = true; - /* - * Order the above store of 'nf_conntrack_locks_all' against - * the spin_unlock_wait() loads below, such that if - * nf_conntrack_lock() observes 'nf_conntrack_locks_all' - * we must observe nf_conntrack_locks[] held: - */ - smp_mb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ + nf_conntrack_locks_all = true; for (i = 0; i < CONNTRACK_LOCKS; i++) { - spin_unlock_wait(&nf_conntrack_locks[i]); + spin_lock(&nf_conntrack_locks[i]); + + /* This spin_unlock provides the "release" to ensure that + * nf_conntrack_locks_all==true is visible to everyone that + * acquired spin_lock(&nf_conntrack_locks[]). + */ + spin_unlock(&nf_conntrack_locks[i]); } } -- 2.5.2
WARNING: multiple messages have this Message-ID (diff)
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: netfilter-devel@vger.kernel.org, netdev@vger.kernel.org, oleg@redhat.com, akpm@linux-foundation.org, mingo@redhat.com, dave@stgolabs.net, manfred@colorfullife.com, tj@kernel.org, arnd@arndb.de, linux-arch@vger.kernel.org, will.deacon@arm.com, peterz@infradead.org, stern@rowland.harvard.edu, parri.andrea@gmail.com, torvalds@linux-foundation.org, stable@vger.kernel.org, Sasha Levin <sasha.levin@oracle.com>, Pablo Neira Ayuso <pablo@netfilter.org>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Subject: [PATCH v2 1/9] net/netfilter/nf_conntrack_core: Fix net_conntrack_lock() Date: Wed, 5 Jul 2017 16:31:35 -0700 [thread overview] Message-ID: <1499297503-23852-1-git-send-email-paulmck@linux.vnet.ibm.com> (raw) In-Reply-To: <20170705232955.GA15992@linux.vnet.ibm.com> From: Manfred Spraul <manfred@colorfullife.com> As we want to remove spin_unlock_wait() and replace it with explicit spin_lock()/spin_unlock() calls, we can use this to simplify the locking. In addition: - Reading nf_conntrack_locks_all needs ACQUIRE memory ordering. - The new code avoids the backwards loop. Only slightly tested, I did not manage to trigger calls to nf_conntrack_all_lock(). Fixes: b16c29191dc8 Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Cc: <stable@vger.kernel.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Pablo Neira Ayuso <pablo@netfilter.org> Cc: netfilter-devel@vger.kernel.org Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> --- net/netfilter/nf_conntrack_core.c | 44 +++++++++++++++++++++------------------ 1 file changed, 24 insertions(+), 20 deletions(-) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index e847dbaa0c6b..1193565c38ae 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -96,19 +96,24 @@ static struct conntrack_gc_work conntrack_gc_work; void nf_conntrack_lock(spinlock_t *lock) __acquires(lock) { + /* 1) Acquire the lock */ spin_lock(lock); - while (unlikely(nf_conntrack_locks_all)) { - spin_unlock(lock); - /* - * Order the 'nf_conntrack_locks_all' load vs. the - * spin_unlock_wait() loads below, to ensure - * that 'nf_conntrack_locks_all_lock' is indeed held: - */ - smp_rmb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ - spin_unlock_wait(&nf_conntrack_locks_all_lock); - spin_lock(lock); - } + /* 2) read nf_conntrack_locks_all, with ACQUIRE semantics */ + if (likely(smp_load_acquire(&nf_conntrack_locks_all) == false)) + return; + + /* fast path failed, unlock */ + spin_unlock(lock); + + /* Slow path 1) get global lock */ + spin_lock(&nf_conntrack_locks_all_lock); + + /* Slow path 2) get the lock we want */ + spin_lock(lock); + + /* Slow path 3) release the global lock */ + spin_unlock(&nf_conntrack_locks_all_lock); } EXPORT_SYMBOL_GPL(nf_conntrack_lock); @@ -149,18 +154,17 @@ static void nf_conntrack_all_lock(void) int i; spin_lock(&nf_conntrack_locks_all_lock); - nf_conntrack_locks_all = true; - /* - * Order the above store of 'nf_conntrack_locks_all' against - * the spin_unlock_wait() loads below, such that if - * nf_conntrack_lock() observes 'nf_conntrack_locks_all' - * we must observe nf_conntrack_locks[] held: - */ - smp_mb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ + nf_conntrack_locks_all = true; for (i = 0; i < CONNTRACK_LOCKS; i++) { - spin_unlock_wait(&nf_conntrack_locks[i]); + spin_lock(&nf_conntrack_locks[i]); + + /* This spin_unlock provides the "release" to ensure that + * nf_conntrack_locks_all==true is visible to everyone that + * acquired spin_lock(&nf_conntrack_locks[]). + */ + spin_unlock(&nf_conntrack_locks[i]); } } -- 2.5.2
next prev parent reply other threads:[~2017-07-05 23:32 UTC|newest] Thread overview: 211+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-06-29 23:59 [PATCH RFC 0/26] Remove spin_unlock_wait() Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 01/26] netfilter: Replace spin_unlock_wait() with lock/unlock pair Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney [not found] ` <a6642feb-2f3a-980f-5ed6-2deb79563e6b@colorfullife.com> 2017-07-02 2:00 ` Paul E. McKenney 2017-07-03 14:39 ` Alan Stern 2017-07-03 14:39 ` Alan Stern 2017-07-03 17:14 ` Paul E. McKenney 2017-07-03 19:01 ` Manfred Spraul 2017-07-03 19:57 ` Alan Stern 2017-07-03 19:57 ` Alan Stern 2017-07-06 18:43 ` Manfred Spraul 2017-07-06 18:43 ` Manfred Spraul 2017-07-06 18:43 ` Manfred Spraul 2017-07-03 20:04 ` Alan Stern 2017-07-03 20:04 ` Alan Stern 2017-07-03 20:53 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 02/26] task_work: " Paul E. McKenney 2017-06-30 11:04 ` Oleg Nesterov 2017-06-30 12:50 ` Paul E. McKenney 2017-06-30 15:20 ` Oleg Nesterov 2017-06-30 16:16 ` Paul E. McKenney 2017-06-30 17:21 ` Paul E. McKenney 2017-06-30 19:21 ` Oleg Nesterov 2017-06-30 19:50 ` Alan Stern 2017-06-30 19:50 ` Alan Stern 2017-06-30 20:04 ` Paul E. McKenney 2017-06-30 20:02 ` Paul E. McKenney 2017-06-30 20:19 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 03/26] sched: " Paul E. McKenney 2017-06-30 10:31 ` Arnd Bergmann 2017-06-30 12:35 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 04/26] completion: " Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 05/26] exit: " Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 06/26] ipc: " Paul E. McKenney 2017-07-01 19:23 ` Manfred Spraul 2017-07-02 3:16 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 07/26] drivers/ata: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 08/26] locking: Remove spin_unlock_wait() generic definitions Paul E. McKenney 2017-06-30 9:19 ` Will Deacon 2017-06-30 12:38 ` Paul E. McKenney 2017-06-30 13:13 ` Will Deacon 2017-06-30 22:18 ` Paul E. McKenney 2017-07-03 13:15 ` Will Deacon 2017-07-03 16:18 ` Paul E. McKenney 2017-07-03 16:40 ` Linus Torvalds 2017-07-03 17:13 ` Will Deacon 2017-07-03 22:30 ` Paul E. McKenney 2017-07-03 22:49 ` Linus Torvalds 2017-07-04 0:39 ` Paul E. McKenney 2017-07-04 0:54 ` Paul E. McKenney 2017-07-03 21:10 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 09/26] alpha: Remove spin_unlock_wait() arch-specific definitions Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 10/26] arc: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 11/26] arm: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 12/26] arm64: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 9:20 ` Will Deacon 2017-06-30 9:20 ` Will Deacon 2017-06-30 17:29 ` Paul E. McKenney 2017-06-30 17:29 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 13/26] blackfin: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 14/26] hexagon: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 15/26] ia64: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 16/26] m32r: " Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 17/26] metag: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 18/26] mips: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 19/26] mn10300: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 20/26] parisc: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 21/26] powerpc: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-07-02 3:58 ` Boqun Feng 2017-07-05 23:57 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 22/26] s390: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 23/26] sh: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 24/26] sparc: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 25/26] tile: " Paul E. McKenney 2017-06-30 0:06 ` Linus Torvalds 2017-06-30 0:09 ` Paul E. McKenney 2017-06-30 0:14 ` Paul E. McKenney 2017-06-30 0:10 ` Linus Torvalds 2017-06-30 0:24 ` Paul E. McKenney 2017-06-30 0:01 ` [PATCH RFC 26/26] xtensa: " Paul E. McKenney 2017-06-30 0:01 ` Paul E. McKenney 2017-07-05 23:29 ` [PATCH v2 0/9] Remove spin_unlock_wait() Paul E. McKenney 2017-07-05 23:31 ` Paul E. McKenney [this message] 2017-07-05 23:31 ` [PATCH v2 1/9] net/netfilter/nf_conntrack_core: Fix net_conntrack_lock() Paul E. McKenney 2017-07-06 18:45 ` Manfred Spraul 2017-07-06 18:45 ` Manfred Spraul 2017-07-06 18:45 ` Manfred Spraul 2017-07-06 20:26 ` Paul E. McKenney 2017-07-05 23:31 ` [PATCH v2 2/9] task_work: Replace spin_unlock_wait() with lock/unlock pair Paul E. McKenney 2017-07-05 23:31 ` [PATCH v2 3/9] sched: " Paul E. McKenney 2017-07-05 23:31 ` [PATCH v2 4/9] completion: " Paul E. McKenney 2017-07-05 23:31 ` [PATCH v2 5/9] exit: " Paul E. McKenney 2017-07-05 23:31 ` [PATCH v2 6/9] ipc: " Paul E. McKenney 2017-07-05 23:31 ` [PATCH v2 7/9] drivers/ata: " Paul E. McKenney 2017-07-05 23:31 ` Paul E. McKenney 2017-07-05 23:31 ` [PATCH v2 8/9] locking: Remove spin_unlock_wait() generic definitions Paul E. McKenney 2017-07-05 23:31 ` [PATCH v2 9/9] arch: Remove spin_unlock_wait() arch-specific definitions Paul E. McKenney 2017-07-06 14:12 ` [PATCH v2 0/9] Remove spin_unlock_wait() David Laight 2017-07-06 15:21 ` Paul E. McKenney 2017-07-06 15:21 ` Paul E. McKenney 2017-07-06 15:21 ` Paul E. McKenney 2017-07-06 16:10 ` Peter Zijlstra 2017-07-06 16:10 ` Peter Zijlstra 2017-07-06 16:10 ` Peter Zijlstra 2017-07-06 16:24 ` Paul E. McKenney 2017-07-06 16:24 ` Paul E. McKenney 2017-07-06 16:24 ` Paul E. McKenney 2017-07-06 16:41 ` Peter Zijlstra 2017-07-06 16:41 ` Peter Zijlstra 2017-07-06 16:41 ` Peter Zijlstra 2017-07-06 17:03 ` Paul E. McKenney 2017-07-06 17:03 ` Paul E. McKenney 2017-07-06 17:03 ` Paul E. McKenney 2017-07-06 16:49 ` Alan Stern 2017-07-06 16:54 ` Peter Zijlstra 2017-07-06 16:54 ` Peter Zijlstra 2017-07-06 19:37 ` Alan Stern 2017-07-06 19:37 ` Alan Stern 2017-07-06 16:05 ` Peter Zijlstra 2017-07-06 16:05 ` Peter Zijlstra 2017-07-06 16:05 ` Peter Zijlstra 2017-07-06 16:20 ` Paul E. McKenney 2017-07-06 16:20 ` Paul E. McKenney 2017-07-06 16:20 ` Paul E. McKenney 2017-07-06 16:50 ` Peter Zijlstra 2017-07-06 16:50 ` Peter Zijlstra 2017-07-06 16:50 ` Peter Zijlstra 2017-07-06 17:08 ` Will Deacon 2017-07-06 17:08 ` Will Deacon 2017-07-06 17:08 ` Will Deacon 2017-07-06 17:29 ` Paul E. McKenney 2017-07-06 17:29 ` Paul E. McKenney 2017-07-06 17:29 ` Paul E. McKenney 2017-07-06 17:18 ` Paul E. McKenney 2017-07-06 17:18 ` Paul E. McKenney 2017-07-06 17:18 ` Paul E. McKenney 2017-07-07 8:31 ` Ingo Molnar 2017-07-07 8:31 ` Ingo Molnar 2017-07-07 8:31 ` Ingo Molnar 2017-07-07 8:44 ` Peter Zijlstra 2017-07-07 8:44 ` Peter Zijlstra 2017-07-07 8:44 ` Peter Zijlstra 2017-07-07 10:33 ` Ingo Molnar 2017-07-07 10:33 ` Ingo Molnar 2017-07-07 10:33 ` Ingo Molnar 2017-07-07 11:23 ` Peter Zijlstra 2017-07-07 11:23 ` Peter Zijlstra 2017-07-07 11:23 ` Peter Zijlstra 2017-07-07 14:41 ` Paul E. McKenney 2017-07-07 14:41 ` Paul E. McKenney 2017-07-08 8:43 ` Ingo Molnar 2017-07-08 8:43 ` Ingo Molnar 2017-07-08 11:41 ` Paul E. McKenney 2017-07-08 11:41 ` Paul E. McKenney 2017-07-07 17:47 ` Manfred Spraul 2017-07-07 17:47 ` Manfred Spraul 2017-07-07 17:47 ` Manfred Spraul 2017-07-08 8:35 ` Ingo Molnar 2017-07-08 8:35 ` Ingo Molnar 2017-07-08 11:39 ` Paul E. McKenney 2017-07-08 11:39 ` Paul E. McKenney 2017-07-08 12:30 ` Ingo Molnar 2017-07-08 12:30 ` Ingo Molnar 2017-07-08 14:45 ` Paul E. McKenney 2017-07-08 14:45 ` Paul E. McKenney 2017-07-08 16:21 ` Alan Stern 2017-07-08 16:21 ` Alan Stern 2017-07-10 17:22 ` Manfred Spraul 2017-07-07 8:06 ` Ingo Molnar 2017-07-07 8:06 ` Ingo Molnar 2017-07-07 8:06 ` Ingo Molnar 2017-07-07 9:32 ` Ingo Molnar 2017-07-07 9:32 ` Ingo Molnar 2017-07-07 9:32 ` Ingo Molnar 2017-07-07 19:27 ` [PATCH v3 " Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 1/9] net/netfilter/nf_conntrack_core: Fix net_conntrack_lock() Paul E. McKenney 2017-07-07 19:28 ` Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 2/9] task_work: Replace spin_unlock_wait() with lock/unlock pair Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 3/9] sched: " Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 4/9] completion: " Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 5/9] exit: " Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 6/9] ipc: " Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 7/9] drivers/ata: " Paul E. McKenney 2017-07-07 19:28 ` Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 8/9] locking: Remove spin_unlock_wait() generic definitions Paul E. McKenney 2017-07-07 19:28 ` [PATCH v3 9/9] arch: Remove spin_unlock_wait() arch-specific definitions Paul E. McKenney
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