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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 2/9] netfilter: nf_conncount: replace CONNCOUNT_LOCK_SLOTS with CONNCOUNT_SLOTS
Date: Sat, 29 Dec 2018 13:57:56 +0100
Message-ID: <20181229125803.7415-3-pablo@netfilter.org> (raw)
In-Reply-To: <20181229125803.7415-1-pablo@netfilter.org>

From: Shawn Bohrer <sbohrer@cloudflare.com>

Most of the time these were the same value anyway, but when
CONFIG_LOCKDEP was enabled we would use a smaller number of locks to
reduce overhead.  Unfortunately having two values is confusing and not
worth the complexity.

This fixes a bug where tree_gc_worker() would only GC up to
CONNCOUNT_LOCK_SLOTS trees which meant when CONFIG_LOCKDEP was enabled
not all trees would be GCed by tree_gc_worker().

Fixes: 5c789e131cbb9 ("netfilter: nf_conncount: Add list lock and gc worker, and RCU for init tree search")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Shawn Bohrer <sbohrer@cloudflare.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conncount.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/net/netfilter/nf_conncount.c b/net/netfilter/nf_conncount.c
index 9cd180bda092..3271a4e00500 100644
--- a/net/netfilter/nf_conncount.c
+++ b/net/netfilter/nf_conncount.c
@@ -33,12 +33,6 @@
 
 #define CONNCOUNT_SLOTS		256U
 
-#ifdef CONFIG_LOCKDEP
-#define CONNCOUNT_LOCK_SLOTS	8U
-#else
-#define CONNCOUNT_LOCK_SLOTS	256U
-#endif
-
 #define CONNCOUNT_GC_MAX_NODES	8
 #define MAX_KEYLEN		5
 
@@ -60,7 +54,7 @@ struct nf_conncount_rb {
 	struct rcu_head rcu_head;
 };
 
-static spinlock_t nf_conncount_locks[CONNCOUNT_LOCK_SLOTS] __cacheline_aligned_in_smp;
+static spinlock_t nf_conncount_locks[CONNCOUNT_SLOTS] __cacheline_aligned_in_smp;
 
 struct nf_conncount_data {
 	unsigned int keylen;
@@ -353,7 +347,7 @@ insert_tree(struct net *net,
 	unsigned int count = 0, gc_count = 0;
 	bool node_found = false;
 
-	spin_lock_bh(&nf_conncount_locks[hash % CONNCOUNT_LOCK_SLOTS]);
+	spin_lock_bh(&nf_conncount_locks[hash]);
 
 	parent = NULL;
 	rbnode = &(root->rb_node);
@@ -430,7 +424,7 @@ insert_tree(struct net *net,
 	rb_link_node_rcu(&rbconn->node, parent, rbnode);
 	rb_insert_color(&rbconn->node, root);
 out_unlock:
-	spin_unlock_bh(&nf_conncount_locks[hash % CONNCOUNT_LOCK_SLOTS]);
+	spin_unlock_bh(&nf_conncount_locks[hash]);
 	return count;
 }
 
@@ -499,7 +493,7 @@ static void tree_gc_worker(struct work_struct *work)
 	struct rb_node *node;
 	unsigned int tree, next_tree, gc_count = 0;
 
-	tree = data->gc_tree % CONNCOUNT_LOCK_SLOTS;
+	tree = data->gc_tree % CONNCOUNT_SLOTS;
 	root = &data->root[tree];
 
 	rcu_read_lock();
@@ -621,10 +615,7 @@ static int __init nf_conncount_modinit(void)
 {
 	int i;
 
-	BUILD_BUG_ON(CONNCOUNT_LOCK_SLOTS > CONNCOUNT_SLOTS);
-	BUILD_BUG_ON((CONNCOUNT_SLOTS % CONNCOUNT_LOCK_SLOTS) != 0);
-
-	for (i = 0; i < CONNCOUNT_LOCK_SLOTS; ++i)
+	for (i = 0; i < CONNCOUNT_SLOTS; ++i)
 		spin_lock_init(&nf_conncount_locks[i]);
 
 	conncount_conn_cachep = kmem_cache_create("nf_conncount_tuple",
-- 
2.11.0

  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-29 12:57 [PATCH 0/9] Netfilter fixes for net Pablo Neira Ayuso
2018-12-29 12:57 ` [PATCH 1/9] netfilter: nf_tables: fix a missing check of nla_put_failure Pablo Neira Ayuso
2018-12-29 12:57 ` Pablo Neira Ayuso [this message]
2018-12-29 12:57 ` [PATCH 3/9] netfilter: nf_conncount: don't skip eviction when age is negative Pablo Neira Ayuso
2018-12-29 12:57 ` [PATCH 4/9] netfilter: nf_conncount: split gc in two phases Pablo Neira Ayuso
2018-12-29 12:57 ` [PATCH 5/9] netfilter: nf_conncount: restart search when nodes have been erased Pablo Neira Ayuso
2018-12-29 12:58 ` [PATCH 6/9] netfilter: nf_conncount: merge lookup and add functions Pablo Neira Ayuso
2018-12-29 12:58 ` [PATCH 7/9] netfilter: nf_conncount: move all list iterations under spinlock Pablo Neira Ayuso
2018-12-29 12:58 ` [PATCH 8/9] netfilter: nf_conncount: speculative garbage collection on empty lists Pablo Neira Ayuso
2018-12-29 12:58 ` [PATCH 9/9] netfilter: nf_conncount: fix argument order to find_next_bit Pablo Neira Ayuso
2018-12-29 22:33 ` [PATCH 0/9] Netfilter fixes for net David Miller

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