netdev - [PATCH net-next v5 3/6] Convert neigh_* seq

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Message-ID: <20241017070445.4013745-4-gnaaman@drivenets.com>
Date: Thu, 17 Oct 2024 07:04:38 +0000
From: Gilad Naaman <gnaaman@...venets.com>
To: netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Gilad Naaman <gnaaman@...venets.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>,
	Ido Schimmel <idosch@...dia.com>,
	Petr Machata <petrm@...dia.com>
Subject: [PATCH net-next v5 3/6] Convert neigh_* seq_file functions to use hlist

Convert seq_file-related neighbour functionality to use neighbour::hash
and the related for_each macro.

Signed-off-by: Gilad Naaman <gnaaman@...venets.com>
---
 include/net/neighbour.h |   2 +
 net/core/neighbour.c    | 104 +++++++++++++++++++---------------------
 2 files changed, 50 insertions(+), 56 deletions(-)

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 37303656ab65..14f08a2e4f74 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -278,6 +278,8 @@ static inline void *neighbour_priv(const struct neighbour *n)
 extern const struct nla_policy nda_policy[];
 
 #define neigh_for_each(pos, head) hlist_for_each_entry(pos, head, hash)
+#define neigh_first_entry(bucket) \
+	hlist_entry_safe((bucket)->first, struct neighbour, hash)
 
 static inline bool neigh_key_eq32(const struct neighbour *n, const void *pkey)
 {
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index d9c458e6f627..e4e31d2ca2ea 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -3204,43 +3204,53 @@ EXPORT_SYMBOL(neigh_xmit);
 
 #ifdef CONFIG_PROC_FS
 
-static struct neighbour *neigh_get_first(struct seq_file *seq)
+static struct neighbour *neigh_get_valid(struct seq_file *seq,
+					 struct neighbour *n,
+					 loff_t *pos)
 {
 	struct neigh_seq_state *state = seq->private;
 	struct net *net = seq_file_net(seq);
+
+	if (!net_eq(dev_net(n->dev), net))
+		return NULL;
+
+	if (state->neigh_sub_iter) {
+		loff_t fakep = 0;
+		void *v;
+
+		v = state->neigh_sub_iter(state, n, pos ? pos : &fakep);
+		if (!v)
+			return NULL;
+		if (pos)
+			return v;
+	}
+
+	if (!(state->flags & NEIGH_SEQ_SKIP_NOARP))
+		return n;
+
+	if (READ_ONCE(n->nud_state) & ~NUD_NOARP)
+		return n;
+
+	return NULL;
+}
+
+static struct neighbour *neigh_get_first(struct seq_file *seq)
+{
+	struct neigh_seq_state *state = seq->private;
 	struct neigh_hash_table *nht = state->nht;
-	struct neighbour *n = NULL;
-	int bucket;
+	struct neighbour *n, *tmp;
 
 	state->flags &= ~NEIGH_SEQ_IS_PNEIGH;
-	for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) {
-		n = rcu_dereference(nht->hash_buckets[bucket]);
-
-		while (n) {
-			if (!net_eq(dev_net(n->dev), net))
-				goto next;
-			if (state->neigh_sub_iter) {
-				loff_t fakep = 0;
-				void *v;
 
-				v = state->neigh_sub_iter(state, n, &fakep);
-				if (!v)
-					goto next;
-			}
-			if (!(state->flags & NEIGH_SEQ_SKIP_NOARP))
-				break;
-			if (READ_ONCE(n->nud_state) & ~NUD_NOARP)
-				break;
-next:
-			n = rcu_dereference(n->next);
+	while (++state->bucket < (1 << nht->hash_shift)) {
+		neigh_for_each(n, &nht->hash_heads[state->bucket]) {
+			tmp = neigh_get_valid(seq, n, NULL);
+			if (tmp)
+				return tmp;
 		}
-
-		if (n)
-			break;
 	}
-	state->bucket = bucket;
 
-	return n;
+	return NULL;
 }
 
 static struct neighbour *neigh_get_next(struct seq_file *seq,
@@ -3248,46 +3258,28 @@ static struct neighbour *neigh_get_next(struct seq_file *seq,
 					loff_t *pos)
 {
 	struct neigh_seq_state *state = seq->private;
-	struct net *net = seq_file_net(seq);
-	struct neigh_hash_table *nht = state->nht;
+	struct neighbour *tmp;
 
 	if (state->neigh_sub_iter) {
 		void *v = state->neigh_sub_iter(state, n, pos);
+
 		if (v)
 			return n;
 	}
-	n = rcu_dereference(n->next);
-
-	while (1) {
-		while (n) {
-			if (!net_eq(dev_net(n->dev), net))
-				goto next;
-			if (state->neigh_sub_iter) {
-				void *v = state->neigh_sub_iter(state, n, pos);
-				if (v)
-					return n;
-				goto next;
-			}
-			if (!(state->flags & NEIGH_SEQ_SKIP_NOARP))
-				break;
 
-			if (READ_ONCE(n->nud_state) & ~NUD_NOARP)
-				break;
-next:
-			n = rcu_dereference(n->next);
+	hlist_for_each_entry_continue(n, hash) {
+		tmp = neigh_get_valid(seq, n, pos);
+		if (tmp) {
+			n = tmp;
+			goto out;
 		}
-
-		if (n)
-			break;
-
-		if (++state->bucket >= (1 << nht->hash_shift))
-			break;
-
-		n = rcu_dereference(nht->hash_buckets[state->bucket]);
 	}
 
+	n = neigh_get_first(seq);
+out:
 	if (n && pos)
 		--(*pos);
+
 	return n;
 }
 
@@ -3390,7 +3382,7 @@ void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl
 	struct neigh_seq_state *state = seq->private;
 
 	state->tbl = tbl;
-	state->bucket = 0;
+	state->bucket = -1;
 	state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH);
 
 	rcu_read_lock();
-- 
2.46.0