diff mbox series

[net-next,v8,1/6] neighbour: Add hlist_node to struct neighbour

Message ID 20241104080437.103-2-gnaaman@drivenets.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series Improve neigh_flush_dev performance | expand

Checks

Context Check Description
netdev/series_format warning Series does not have a cover letter
netdev/tree_selection success Clearly marked for net-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
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: 16 this patch: 16
netdev/build_tools success Errors and warnings before: 2 (+0) this patch: 2 (+0)
netdev/cc_maintainers warning 1 maintainers not CCed: horms@kernel.org
netdev/build_clang success Errors and warnings before: 27 this patch: 27
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: 2625 this patch: 2625
netdev/checkpatch warning WARNING: line length of 81 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-11-06--12-00 (tests: 782)

Commit Message

Gilad Naaman Nov. 4, 2024, 8:04 a.m. UTC 
Add a doubly-linked node to neighbours, so that they
can be deleted without iterating the entire bucket they're in.

Signed-off-by: Gilad Naaman <gnaaman@drivenets.com>
---
 include/net/neighbour.h |  2 ++
 net/core/neighbour.c    | 20 +++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

Comments

Kuniyuki Iwashima Nov. 6, 2024, 8:26 p.m. UTC | #1 
From: Gilad Naaman <gnaaman@drivenets.com>
Date: Mon,  4 Nov 2024 08:04:29 +0000
> Add a doubly-linked node to neighbours, so that they
> can be deleted without iterating the entire bucket they're in.
> 
> Signed-off-by: Gilad Naaman <gnaaman@drivenets.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
diff mbox series

Patch

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 3887ed9e5026..0402447854c7 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -136,6 +136,7 @@  struct neigh_statistics {
 
 struct neighbour {
 	struct neighbour __rcu	*next;
+	struct hlist_node	hash;
 	struct neigh_table	*tbl;
 	struct neigh_parms	*parms;
 	unsigned long		confirmed;
@@ -191,6 +192,7 @@  struct pneigh_entry {
 
 struct neigh_hash_table {
 	struct neighbour __rcu	**hash_buckets;
+	struct hlist_head	*hash_heads;
 	unsigned int		hash_shift;
 	__u32			hash_rnd[NEIGH_NUM_HASH_RND];
 	struct rcu_head		rcu;
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 4b871cecd2ce..5552e6b05c82 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -216,6 +216,7 @@  static bool neigh_del(struct neighbour *n, struct neighbour __rcu **np,
 		neigh = rcu_dereference_protected(n->next,
 						  lockdep_is_held(&tbl->lock));
 		rcu_assign_pointer(*np, neigh);
+		hlist_del_rcu(&n->hash);
 		neigh_mark_dead(n);
 		retval = true;
 	}
@@ -402,6 +403,7 @@  static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev,
 			rcu_assign_pointer(*np,
 				   rcu_dereference_protected(n->next,
 						lockdep_is_held(&tbl->lock)));
+			hlist_del_rcu(&n->hash);
 			write_lock(&n->lock);
 			neigh_del_timer(n);
 			neigh_mark_dead(n);
@@ -529,20 +531,30 @@  static void neigh_get_hash_rnd(u32 *x)
 
 static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift)
 {
+	size_t hash_heads_size = (1 << shift) * sizeof(struct hlist_head);
 	size_t size = (1 << shift) * sizeof(struct neighbour *);
-	struct neigh_hash_table *ret;
 	struct neighbour __rcu **buckets;
+	struct hlist_head *hash_heads;
+	struct neigh_hash_table *ret;
 	int i;
 
 	ret = kmalloc(sizeof(*ret), GFP_ATOMIC);
 	if (!ret)
 		return NULL;
+
 	buckets = kvzalloc(size, GFP_ATOMIC);
 	if (!buckets) {
 		kfree(ret);
 		return NULL;
 	}
+	hash_heads = kvzalloc(hash_heads_size, GFP_ATOMIC);
+	if (!hash_heads) {
+		kvfree(buckets);
+		kfree(ret);
+		return NULL;
+	}
 	ret->hash_buckets = buckets;
+	ret->hash_heads = hash_heads;
 	ret->hash_shift = shift;
 	for (i = 0; i < NEIGH_NUM_HASH_RND; i++)
 		neigh_get_hash_rnd(&ret->hash_rnd[i]);
@@ -556,6 +568,7 @@  static void neigh_hash_free_rcu(struct rcu_head *head)
 						    rcu);
 
 	kvfree(nht->hash_buckets);
+	kvfree(nht->hash_heads);
 	kfree(nht);
 }
 
@@ -592,6 +605,8 @@  static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl,
 						new_nht->hash_buckets[hash],
 						lockdep_is_held(&tbl->lock)));
 			rcu_assign_pointer(new_nht->hash_buckets[hash], n);
+			hlist_del_rcu(&n->hash);
+			hlist_add_head_rcu(&n->hash, &new_nht->hash_heads[hash]);
 		}
 	}
 
@@ -702,6 +717,7 @@  ___neigh_create(struct neigh_table *tbl, const void *pkey,
 			   rcu_dereference_protected(nht->hash_buckets[hash_val],
 						     lockdep_is_held(&tbl->lock)));
 	rcu_assign_pointer(nht->hash_buckets[hash_val], n);
+	hlist_add_head_rcu(&n->hash, &nht->hash_heads[hash_val]);
 	write_unlock_bh(&tbl->lock);
 	neigh_dbg(2, "neigh %p is created\n", n);
 	rc = n;
@@ -987,6 +1003,7 @@  static void neigh_periodic_work(struct work_struct *work)
 				rcu_assign_pointer(*np,
 					rcu_dereference_protected(n->next,
 						lockdep_is_held(&tbl->lock)));
+				hlist_del_rcu(&n->hash);
 				neigh_mark_dead(n);
 				write_unlock(&n->lock);
 				neigh_cleanup_and_release(n);
@@ -3116,6 +3133,7 @@  void __neigh_for_each_release(struct neigh_table *tbl,
 				rcu_assign_pointer(*np,
 					rcu_dereference_protected(n->next,
 						lockdep_is_held(&tbl->lock)));
+				hlist_del_rcu(&n->hash);
 				neigh_mark_dead(n);
 			} else
 				np = &n->next;