diff mbox series

[net-next,1/4] netfilter: nfnetlink_log: remove rcu_bh usage

Message ID 20230330202928.28705-2-fw@strlen.de (mailing list archive)
State Accepted
Delegated to: Netdev Maintainers
Headers show
Series [net-next,1/4] netfilter: nfnetlink_log: remove rcu_bh usage | expand

Checks

Context Check Description
netdev/series_format success Pull request is its own cover letter
netdev/tree_selection success Clearly marked for net-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 18 this patch: 18
netdev/cc_maintainers warning 3 maintainers not CCed: kadlec@netfilter.org coreteam@netfilter.org pablo@netfilter.org
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 18 this patch: 18
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 93 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Florian Westphal March 30, 2023, 8:29 p.m. UTC
structure is free'd via call_rcu, so its safe to use rcu_read_lock only.

While at it, skip rcu_read_lock for lookup from packet path, its always
called with rcu held.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 net/netfilter/nfnetlink_log.c | 36 ++++++++++++++++++++++-------------
 1 file changed, 23 insertions(+), 13 deletions(-)
diff mbox series

Patch

diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index d97eb280cb2e..e57eb168ee13 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -103,9 +103,9 @@  static inline u_int8_t instance_hashfn(u_int16_t group_num)
 }
 
 static struct nfulnl_instance *
-__instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
+__instance_lookup(const struct nfnl_log_net *log, u16 group_num)
 {
-	struct hlist_head *head;
+	const struct hlist_head *head;
 	struct nfulnl_instance *inst;
 
 	head = &log->instance_table[instance_hashfn(group_num)];
@@ -123,15 +123,25 @@  instance_get(struct nfulnl_instance *inst)
 }
 
 static struct nfulnl_instance *
-instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
+instance_lookup_get_rcu(const struct nfnl_log_net *log, u16 group_num)
 {
 	struct nfulnl_instance *inst;
 
-	rcu_read_lock_bh();
 	inst = __instance_lookup(log, group_num);
 	if (inst && !refcount_inc_not_zero(&inst->use))
 		inst = NULL;
-	rcu_read_unlock_bh();
+
+	return inst;
+}
+
+static struct nfulnl_instance *
+instance_lookup_get(const struct nfnl_log_net *log, u16 group_num)
+{
+	struct nfulnl_instance *inst;
+
+	rcu_read_lock();
+	inst = instance_lookup_get_rcu(log, group_num);
+	rcu_read_unlock();
 
 	return inst;
 }
@@ -698,7 +708,7 @@  nfulnl_log_packet(struct net *net,
 	else
 		li = &default_loginfo;
 
-	inst = instance_lookup_get(log, li->u.ulog.group);
+	inst = instance_lookup_get_rcu(log, li->u.ulog.group);
 	if (!inst)
 		return;
 
@@ -1030,7 +1040,7 @@  static struct hlist_node *get_first(struct net *net, struct iter_state *st)
 		struct hlist_head *head = &log->instance_table[st->bucket];
 
 		if (!hlist_empty(head))
-			return rcu_dereference_bh(hlist_first_rcu(head));
+			return rcu_dereference(hlist_first_rcu(head));
 	}
 	return NULL;
 }
@@ -1038,7 +1048,7 @@  static struct hlist_node *get_first(struct net *net, struct iter_state *st)
 static struct hlist_node *get_next(struct net *net, struct iter_state *st,
 				   struct hlist_node *h)
 {
-	h = rcu_dereference_bh(hlist_next_rcu(h));
+	h = rcu_dereference(hlist_next_rcu(h));
 	while (!h) {
 		struct nfnl_log_net *log;
 		struct hlist_head *head;
@@ -1048,7 +1058,7 @@  static struct hlist_node *get_next(struct net *net, struct iter_state *st,
 
 		log = nfnl_log_pernet(net);
 		head = &log->instance_table[st->bucket];
-		h = rcu_dereference_bh(hlist_first_rcu(head));
+		h = rcu_dereference(hlist_first_rcu(head));
 	}
 	return h;
 }
@@ -1066,9 +1076,9 @@  static struct hlist_node *get_idx(struct net *net, struct iter_state *st,
 }
 
 static void *seq_start(struct seq_file *s, loff_t *pos)
-	__acquires(rcu_bh)
+	__acquires(rcu)
 {
-	rcu_read_lock_bh();
+	rcu_read_lock();
 	return get_idx(seq_file_net(s), s->private, *pos);
 }
 
@@ -1079,9 +1089,9 @@  static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
 }
 
 static void seq_stop(struct seq_file *s, void *v)
-	__releases(rcu_bh)
+	__releases(rcu)
 {
-	rcu_read_unlock_bh();
+	rcu_read_unlock();
 }
 
 static int seq_show(struct seq_file *s, void *v)