diff mbox series

[bpf-next,02/16] bpf: Refactor codes into bpf_local_storage_destroy

Message ID 20230306084216.3186830-3-martin.lau@linux.dev (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: Use bpf_mem_cache_alloc/free in bpf_local_storage | expand

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netdev/cc_maintainers warning 14 maintainers not CCed: pabeni@redhat.com joannelkoong@gmail.com davem@davemloft.net jolsa@kernel.org john.fastabend@gmail.com yhs@fb.com kpsingh@kernel.org song@kernel.org houtao1@huawei.com haoluo@google.com edumazet@google.com kuba@kernel.org netdev@vger.kernel.org sdf@google.com
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Commit Message

Martin KaFai Lau March 6, 2023, 8:42 a.m. UTC 
From: Martin KaFai Lau <martin.lau@kernel.org>

This patch first renames bpf_local_storage_unlink_nolock to
bpf_local_storage_destroy(). It better reflects that it is only
used when the storage's owner (sk/task/cgrp/inode) is being kfree().

All bpf_local_storage_destroy's caller is taking the spin lock and
then free the storage. This patch also moves these two steps into
the bpf_local_storage_destroy.

This is a preparation work for a later patch that uses
bpf_mem_cache_alloc/free in the bpf_local_storage.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
---
 include/linux/bpf_local_storage.h | 2 +-
 kernel/bpf/bpf_cgrp_storage.c     | 9 +--------
 kernel/bpf/bpf_inode_storage.c    | 8 +-------
 kernel/bpf/bpf_local_storage.c    | 8 ++++++--
 kernel/bpf/bpf_task_storage.c     | 9 +--------
 net/core/bpf_sk_storage.c         | 8 +-------
 6 files changed, 11 insertions(+), 33 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/bpf_local_storage.h b/include/linux/bpf_local_storage.h
index 6917c9a408a1..c8dcf6f40497 100644
--- a/include/linux/bpf_local_storage.h
+++ b/include/linux/bpf_local_storage.h
@@ -128,7 +128,7 @@  bpf_local_storage_lookup(struct bpf_local_storage *local_storage,
 			 struct bpf_local_storage_map *smap,
 			 bool cacheit_lockit);
 
-bool bpf_local_storage_unlink_nolock(struct bpf_local_storage *local_storage);
+void bpf_local_storage_destroy(struct bpf_local_storage *local_storage);
 
 void bpf_local_storage_map_free(struct bpf_map *map,
 				struct bpf_local_storage_cache *cache,
diff --git a/kernel/bpf/bpf_cgrp_storage.c b/kernel/bpf/bpf_cgrp_storage.c
index 6cdf6d9ed91d..1d00f1d9bdb7 100644
--- a/kernel/bpf/bpf_cgrp_storage.c
+++ b/kernel/bpf/bpf_cgrp_storage.c
@@ -46,8 +46,6 @@  static struct bpf_local_storage __rcu **cgroup_storage_ptr(void *owner)
 void bpf_cgrp_storage_free(struct cgroup *cgroup)
 {
 	struct bpf_local_storage *local_storage;
-	bool free_cgroup_storage = false;
-	unsigned long flags;
 
 	rcu_read_lock();
 	local_storage = rcu_dereference(cgroup->bpf_cgrp_storage);
@@ -57,14 +55,9 @@  void bpf_cgrp_storage_free(struct cgroup *cgroup)
 	}
 
 	bpf_cgrp_storage_lock();
-	raw_spin_lock_irqsave(&local_storage->lock, flags);
-	free_cgroup_storage = bpf_local_storage_unlink_nolock(local_storage);
-	raw_spin_unlock_irqrestore(&local_storage->lock, flags);
+	bpf_local_storage_destroy(local_storage);
 	bpf_cgrp_storage_unlock();
 	rcu_read_unlock();
-
-	if (free_cgroup_storage)
-		kfree_rcu(local_storage, rcu);
 }
 
 static struct bpf_local_storage_data *
diff --git a/kernel/bpf/bpf_inode_storage.c b/kernel/bpf/bpf_inode_storage.c
index 05f4c66c9089..b4a9904df54e 100644
--- a/kernel/bpf/bpf_inode_storage.c
+++ b/kernel/bpf/bpf_inode_storage.c
@@ -57,7 +57,6 @@  static struct bpf_local_storage_data *inode_storage_lookup(struct inode *inode,
 void bpf_inode_storage_free(struct inode *inode)
 {
 	struct bpf_local_storage *local_storage;
-	bool free_inode_storage = false;
 	struct bpf_storage_blob *bsb;
 
 	bsb = bpf_inode(inode);
@@ -72,13 +71,8 @@  void bpf_inode_storage_free(struct inode *inode)
 		return;
 	}
 
-	raw_spin_lock_bh(&local_storage->lock);
-	free_inode_storage = bpf_local_storage_unlink_nolock(local_storage);
-	raw_spin_unlock_bh(&local_storage->lock);
+	bpf_local_storage_destroy(local_storage);
 	rcu_read_unlock();
-
-	if (free_inode_storage)
-		kfree_rcu(local_storage, rcu);
 }
 
 static void *bpf_fd_inode_storage_lookup_elem(struct bpf_map *map, void *key)
diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c
index 0510f50bd3ea..4d2bc7c97f7d 100644
--- a/kernel/bpf/bpf_local_storage.c
+++ b/kernel/bpf/bpf_local_storage.c
@@ -652,11 +652,12 @@  int bpf_local_storage_map_check_btf(const struct bpf_map *map,
 	return 0;
 }
 
-bool bpf_local_storage_unlink_nolock(struct bpf_local_storage *local_storage)
+void bpf_local_storage_destroy(struct bpf_local_storage *local_storage)
 {
 	struct bpf_local_storage_elem *selem;
 	bool free_storage = false;
 	struct hlist_node *n;
+	unsigned long flags;
 
 	/* Neither the bpf_prog nor the bpf_map's syscall
 	 * could be modifying the local_storage->list now.
@@ -667,6 +668,7 @@  bool bpf_local_storage_unlink_nolock(struct bpf_local_storage *local_storage)
 	 * when unlinking elem from the local_storage->list and
 	 * the map's bucket->list.
 	 */
+	raw_spin_lock_irqsave(&local_storage->lock, flags);
 	hlist_for_each_entry_safe(selem, n, &local_storage->list, snode) {
 		/* Always unlink from map before unlinking from
 		 * local_storage.
@@ -681,8 +683,10 @@  bool bpf_local_storage_unlink_nolock(struct bpf_local_storage *local_storage)
 		free_storage = bpf_selem_unlink_storage_nolock(
 			local_storage, selem, false, false);
 	}
+	raw_spin_unlock_irqrestore(&local_storage->lock, flags);
 
-	return free_storage;
+	if (free_storage)
+		kfree_rcu(local_storage, rcu);
 }
 
 struct bpf_map *
diff --git a/kernel/bpf/bpf_task_storage.c b/kernel/bpf/bpf_task_storage.c
index 1e486055a523..b5f404fe146c 100644
--- a/kernel/bpf/bpf_task_storage.c
+++ b/kernel/bpf/bpf_task_storage.c
@@ -72,8 +72,6 @@  task_storage_lookup(struct task_struct *task, struct bpf_map *map,
 void bpf_task_storage_free(struct task_struct *task)
 {
 	struct bpf_local_storage *local_storage;
-	bool free_task_storage = false;
-	unsigned long flags;
 
 	rcu_read_lock();
 
@@ -84,14 +82,9 @@  void bpf_task_storage_free(struct task_struct *task)
 	}
 
 	bpf_task_storage_lock();
-	raw_spin_lock_irqsave(&local_storage->lock, flags);
-	free_task_storage = bpf_local_storage_unlink_nolock(local_storage);
-	raw_spin_unlock_irqrestore(&local_storage->lock, flags);
+	bpf_local_storage_destroy(local_storage);
 	bpf_task_storage_unlock();
 	rcu_read_unlock();
-
-	if (free_task_storage)
-		kfree_rcu(local_storage, rcu);
 }
 
 static void *bpf_pid_task_storage_lookup_elem(struct bpf_map *map, void *key)
diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c
index bb378c33f542..42569d0904a5 100644
--- a/net/core/bpf_sk_storage.c
+++ b/net/core/bpf_sk_storage.c
@@ -49,7 +49,6 @@  static int bpf_sk_storage_del(struct sock *sk, struct bpf_map *map)
 void bpf_sk_storage_free(struct sock *sk)
 {
 	struct bpf_local_storage *sk_storage;
-	bool free_sk_storage = false;
 
 	rcu_read_lock();
 	sk_storage = rcu_dereference(sk->sk_bpf_storage);
@@ -58,13 +57,8 @@  void bpf_sk_storage_free(struct sock *sk)
 		return;
 	}
 
-	raw_spin_lock_bh(&sk_storage->lock);
-	free_sk_storage = bpf_local_storage_unlink_nolock(sk_storage);
-	raw_spin_unlock_bh(&sk_storage->lock);
+	bpf_local_storage_destroy(sk_storage);
 	rcu_read_unlock();
-
-	if (free_sk_storage)
-		kfree_rcu(sk_storage, rcu);
 }
 
 static void bpf_sk_storage_map_free(struct bpf_map *map)