netdev - [PATCH net-next v4 2/6] Define neigh_for

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Message-ID: <20241015165929.3203216-3-gnaaman@drivenets.com>
Date: Tue, 15 Oct 2024 16:59:22 +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>
Subject: [PATCH net-next v4 2/6] Define neigh_for_each

Define neigh_for_each in neighbour.h and move old definition
to its only point of usage within the mlxsw driver.

Signed-off-by: Gilad Naaman <gnaaman@...venets.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_router.c | 25 +++++++++++++++++--
 include/net/neighbour.h                       |  4 +--
 net/core/neighbour.c                          | 22 ----------------
 3 files changed, 25 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 800dfb64ec83..0bb46aba2502 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3006,6 +3006,27 @@ static void mlxsw_sp_neigh_rif_made_sync_each(struct neighbour *n, void *data)
 		rms->err = -ENOMEM;
 }
 
+static void mlxsw_sp_neigh_for_each(struct neigh_table *tbl,
+				    void (*cb)(struct neighbour *, void *),
+				    void *cookie)
+{
+	int chain;
+	struct neigh_hash_table *nht;
+
+	rcu_read_lock();
+	nht = rcu_dereference(tbl->nht);
+
+	read_lock_bh(&tbl->lock); /* avoid resizes */
+	for (chain = 0; chain < (1 << nht->hash_shift); chain++) {
+		struct neighbour *n;
+
+		neigh_for_each(n, &nht->hash_heads[chain])
+			cb(n, cookie);
+	}
+	read_unlock_bh(&tbl->lock);
+	rcu_read_unlock();
+}
+
 static int mlxsw_sp_neigh_rif_made_sync(struct mlxsw_sp *mlxsw_sp,
 					struct mlxsw_sp_rif *rif)
 {
@@ -3014,12 +3035,12 @@ static int mlxsw_sp_neigh_rif_made_sync(struct mlxsw_sp *mlxsw_sp,
 		.rif = rif,
 	};
 
-	neigh_for_each(&arp_tbl, mlxsw_sp_neigh_rif_made_sync_each, &rms);
+	mlxsw_sp_neigh_for_each(&arp_tbl, mlxsw_sp_neigh_rif_made_sync_each, &rms);
 	if (rms.err)
 		goto err_arp;
 
 #if IS_ENABLED(CONFIG_IPV6)
-	neigh_for_each(&nd_tbl, mlxsw_sp_neigh_rif_made_sync_each, &rms);
+	mlxsw_sp_neigh_for_each(&nd_tbl, mlxsw_sp_neigh_rif_made_sync_each, &rms);
 #endif
 	if (rms.err)
 		goto err_nd;
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 5f2b7249ba02..2f4cb9e51364 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)
+
 static inline bool neigh_key_eq32(const struct neighbour *n, const void *pkey)
 {
 	return *(const u32 *)n->primary_key == *(const u32 *)pkey;
@@ -391,8 +393,6 @@ static inline struct net *pneigh_net(const struct pneigh_entry *pneigh)
 }
 
 void neigh_app_ns(struct neighbour *n);
-void neigh_for_each(struct neigh_table *tbl,
-		    void (*cb)(struct neighbour *, void *), void *cookie);
 void __neigh_for_each_release(struct neigh_table *tbl,
 			      int (*cb)(struct neighbour *));
 int neigh_xmit(int fam, struct net_device *, const void *, struct sk_buff *);
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 01987368b6c5..e91105a4c5ee 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -3113,28 +3113,6 @@ static int neigh_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 	return err;
 }
 
-void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie)
-{
-	int chain;
-	struct neigh_hash_table *nht;
-
-	rcu_read_lock();
-	nht = rcu_dereference(tbl->nht);
-
-	read_lock_bh(&tbl->lock); /* avoid resizes */
-	for (chain = 0; chain < (1 << nht->hash_shift); chain++) {
-		struct neighbour *n;
-
-		for (n = rcu_dereference(nht->hash_buckets[chain]);
-		     n != NULL;
-		     n = rcu_dereference(n->next))
-			cb(n, cookie);
-	}
-	read_unlock_bh(&tbl->lock);
-	rcu_read_unlock();
-}
-EXPORT_SYMBOL(neigh_for_each);
-
 /* The tbl->lock must be held as a writer and BH disabled. */
 void __neigh_for_each_release(struct neigh_table *tbl,
 			      int (*cb)(struct neighbour *))
-- 
2.46.0