bpf: introduce per-cpu cgroup local storage

This commit introduced per-cpu cgroup local storage.

Per-cpu cgroup local storage is very similar to simple cgroup storage
(let's call it shared), except all the data is per-cpu.

The main goal of per-cpu variant is to implement super fast
counters (e.g. packet counters), which don't require neither
lookups, neither atomic operations.

>From userspace's point of view, accessing a per-cpu cgroup storage
is similar to other per-cpu map types (e.g. per-cpu hashmaps and
arrays).

Writing to a per-cpu cgroup storage is not atomic, but is performed
by copying longs, so some minimal atomicity is here, exactly
as with other per-cpu maps.

Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

4 files changed, 157 insertions, 27 deletions

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index e42f8789b7ea..6502115e8f55 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -206,10 +206,16 @@ BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags)
 	 */
 	enum bpf_cgroup_storage_type stype = cgroup_storage_type(map);
 	struct bpf_cgroup_storage *storage;
+	void *ptr;
 
 	storage = this_cpu_read(bpf_cgroup_storage[stype]);
 
-	return (unsigned long)&READ_ONCE(storage->buf)->data[0];
+	if (stype == BPF_CGROUP_STORAGE_SHARED)
+		ptr = &READ_ONCE(storage->buf)->data[0];
+	else
+		ptr = this_cpu_ptr(storage->percpu_buf);
+
+	return (unsigned long)ptr;
 }
 
 const struct bpf_func_proto bpf_get_local_storage_proto = {
diff --git a/kernel/bpf/local_storage.c b/kernel/bpf/local_storage.c
index 6742292fb39e..944eb297465f 100644
--- a/kernel/bpf/local_storage.c
+++ b/kernel/bpf/local_storage.c
@@ -152,6 +152,71 @@ static int cgroup_storage_update_elem(struct bpf_map *map, void *_key,
 	return 0;
 }
 
+int bpf_percpu_cgroup_storage_copy(struct bpf_map *_map, void *_key,
+				   void *value)
+{
+	struct bpf_cgroup_storage_map *map = map_to_storage(_map);
+	struct bpf_cgroup_storage_key *key = _key;
+	struct bpf_cgroup_storage *storage;
+	int cpu, off = 0;
+	u32 size;
+
+	rcu_read_lock();
+	storage = cgroup_storage_lookup(map, key, false);
+	if (!storage) {
+		rcu_read_unlock();
+		return -ENOENT;
+	}
+
+	/* per_cpu areas are zero-filled and bpf programs can only
+	 * access 'value_size' of them, so copying rounded areas
+	 * will not leak any kernel data
+	 */
+	size = round_up(_map->value_size, 8);
+	for_each_possible_cpu(cpu) {
+		bpf_long_memcpy(value + off,
+				per_cpu_ptr(storage->percpu_buf, cpu), size);
+		off += size;
+	}
+	rcu_read_unlock();
+	return 0;
+}
+
+int bpf_percpu_cgroup_storage_update(struct bpf_map *_map, void *_key,
+				     void *value, u64 map_flags)
+{
+	struct bpf_cgroup_storage_map *map = map_to_storage(_map);
+	struct bpf_cgroup_storage_key *key = _key;
+	struct bpf_cgroup_storage *storage;
+	int cpu, off = 0;
+	u32 size;
+
+	if (map_flags != BPF_ANY && map_flags != BPF_EXIST)
+		return -EINVAL;
+
+	rcu_read_lock();
+	storage = cgroup_storage_lookup(map, key, false);
+	if (!storage) {
+		rcu_read_unlock();
+		return -ENOENT;
+	}
+
+	/* the user space will provide round_up(value_size, 8) bytes that
+	 * will be copied into per-cpu area. bpf programs can only access
+	 * value_size of it. During lookup the same extra bytes will be
+	 * returned or zeros which were zero-filled by percpu_alloc,
+	 * so no kernel data leaks possible
+	 */
+	size = round_up(_map->value_size, 8);
+	for_each_possible_cpu(cpu) {
+		bpf_long_memcpy(per_cpu_ptr(storage->percpu_buf, cpu),
+				value + off, size);
+		off += size;
+	}
+	rcu_read_unlock();
+	return 0;
+}
+
 static int cgroup_storage_get_next_key(struct bpf_map *_map, void *_key,
 				       void *_next_key)
 {
@@ -287,60 +352,105 @@ void bpf_cgroup_storage_release(struct bpf_prog *prog, struct bpf_map *_map)
 	spin_unlock_bh(&map->lock);
 }
 
+static size_t bpf_cgroup_storage_calculate_size(struct bpf_map *map, u32 *pages)
+{
+	size_t size;
+
+	if (cgroup_storage_type(map) == BPF_CGROUP_STORAGE_SHARED) {
+		size = sizeof(struct bpf_storage_buffer) + map->value_size;
+		*pages = round_up(sizeof(struct bpf_cgroup_storage) + size,
+				  PAGE_SIZE) >> PAGE_SHIFT;
+	} else {
+		size = map->value_size;
+		*pages = round_up(round_up(size, 8) * num_possible_cpus(),
+				  PAGE_SIZE) >> PAGE_SHIFT;
+	}
+
+	return size;
+}
+
 struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
 					enum bpf_cgroup_storage_type stype)
 {
 	struct bpf_cgroup_storage *storage;
 	struct bpf_map *map;
+	gfp_t flags;
+	size_t size;
 	u32 pages;
 
 	map = prog->aux->cgroup_storage[stype];
 	if (!map)
 		return NULL;
 
-	pages = round_up(sizeof(struct bpf_cgroup_storage) +
-			 sizeof(struct bpf_storage_buffer) +
-			 map->value_size, PAGE_SIZE) >> PAGE_SHIFT;
+	size = bpf_cgroup_storage_calculate_size(map, &pages);
+
 	if (bpf_map_charge_memlock(map, pages))
 		return ERR_PTR(-EPERM);
 
 	storage = kmalloc_node(sizeof(struct bpf_cgroup_storage),
 			       __GFP_ZERO | GFP_USER, map->numa_node);
-	if (!storage) {
-		bpf_map_uncharge_memlock(map, pages);
-		return ERR_PTR(-ENOMEM);
-	}
+	if (!storage)
+		goto enomem;
 
-	storage->buf = kmalloc_node(sizeof(struct bpf_storage_buffer) +
-				    map->value_size, __GFP_ZERO | GFP_USER,
-				    map->numa_node);
-	if (!storage->buf) {
-		bpf_map_uncharge_memlock(map, pages);
-		kfree(storage);
-		return ERR_PTR(-ENOMEM);
+	flags = __GFP_ZERO | GFP_USER;
+
+	if (stype == BPF_CGROUP_STORAGE_SHARED) {
+		storage->buf = kmalloc_node(size, flags, map->numa_node);
+		if (!storage->buf)
+			goto enomem;
+	} else {
+		storage->percpu_buf = __alloc_percpu_gfp(size, 8, flags);
+		if (!storage->percpu_buf)
+			goto enomem;
 	}
 
 	storage->map = (struct bpf_cgroup_storage_map *)map;
 
 	return storage;
+
+enomem:
+	bpf_map_uncharge_memlock(map, pages);
+	kfree(storage);
+	return ERR_PTR(-ENOMEM);
+}
+
+static void free_shared_cgroup_storage_rcu(struct rcu_head *rcu)
+{
+	struct bpf_cgroup_storage *storage =
+		container_of(rcu, struct bpf_cgroup_storage, rcu);
+
+	kfree(storage->buf);
+	kfree(storage);
+}
+
+static void free_percpu_cgroup_storage_rcu(struct rcu_head *rcu)
+{
+	struct bpf_cgroup_storage *storage =
+		container_of(rcu, struct bpf_cgroup_storage, rcu);
+
+	free_percpu(storage->percpu_buf);
+	kfree(storage);
 }
 
 void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage)
 {
-	u32 pages;
+	enum bpf_cgroup_storage_type stype;
 	struct bpf_map *map;
+	u32 pages;
 
 	if (!storage)
 		return;
 
 	map = &storage->map->map;
-	pages = round_up(sizeof(struct bpf_cgroup_storage) +
-			 sizeof(struct bpf_storage_buffer) +
-			 map->value_size, PAGE_SIZE) >> PAGE_SHIFT;
+
+	bpf_cgroup_storage_calculate_size(map, &pages);
 	bpf_map_uncharge_memlock(map, pages);
 
-	kfree_rcu(storage->buf, rcu);
-	kfree_rcu(storage, rcu);
+	stype = cgroup_storage_type(map);
+	if (stype == BPF_CGROUP_STORAGE_SHARED)
+		call_rcu(&storage->rcu, free_shared_cgroup_storage_rcu);
+	else
+		call_rcu(&storage->rcu, free_percpu_cgroup_storage_rcu);
 }
 
 void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage,
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 8c91d2b41b1e..5742df21598c 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -686,7 +686,8 @@ static int map_lookup_elem(union bpf_attr *attr)
 
 	if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
 	    map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
-	    map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY)
+	    map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
+	    map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
 		value_size = round_up(map->value_size, 8) * num_possible_cpus();
 	else if (IS_FD_MAP(map))
 		value_size = sizeof(u32);
@@ -705,6 +706,8 @@ static int map_lookup_elem(union bpf_attr *attr)
 		err = bpf_percpu_hash_copy(map, key, value);
 	} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
 		err = bpf_percpu_array_copy(map, key, value);
+	} else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
+		err = bpf_percpu_cgroup_storage_copy(map, key, value);
 	} else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
 		err = bpf_stackmap_copy(map, key, value);
 	} else if (IS_FD_ARRAY(map)) {
@@ -774,7 +777,8 @@ static int map_update_elem(union bpf_attr *attr)
 
 	if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
 	    map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
-	    map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY)
+	    map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
+	    map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
 		value_size = round_up(map->value_size, 8) * num_possible_cpus();
 	else
 		value_size = map->value_size;
@@ -809,6 +813,9 @@ static int map_update_elem(union bpf_attr *attr)
 		err = bpf_percpu_hash_update(map, key, value, attr->flags);
 	} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
 		err = bpf_percpu_array_update(map, key, value, attr->flags);
+	} else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
+		err = bpf_percpu_cgroup_storage_update(map, key, value,
+						       attr->flags);
 	} else if (IS_FD_ARRAY(map)) {
 		rcu_read_lock();
 		err = bpf_fd_array_map_update_elem(map, f.file, key, value,
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index e90899df585d..a8cc83a970d1 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2074,6 +2074,7 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env,
 			goto error;
 		break;
 	case BPF_MAP_TYPE_CGROUP_STORAGE:
+	case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
 		if (func_id != BPF_FUNC_get_local_storage)
 			goto error;
 		break;
@@ -2164,7 +2165,8 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env,
 			goto error;
 		break;
 	case BPF_FUNC_get_local_storage:
-		if (map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE)
+		if (map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
+		    map->map_type != BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
 			goto error;
 		break;
 	case BPF_FUNC_sk_select_reuseport:
@@ -5049,6 +5051,12 @@ static int check_map_prog_compatibility(struct bpf_verifier_env *env,
 	return 0;
 }
 
+static bool bpf_map_is_cgroup_storage(struct bpf_map *map)
+{
+	return (map->map_type == BPF_MAP_TYPE_CGROUP_STORAGE ||
+		map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE);
+}
+
 /* look for pseudo eBPF instructions that access map FDs and
  * replace them with actual map pointers
  */
@@ -5139,10 +5147,9 @@ static int replace_map_fd_with_map_ptr(struct bpf_verifier_env *env)
 			}
 			env->used_maps[env->used_map_cnt++] = map;
 
-			if (map->map_type == BPF_MAP_TYPE_CGROUP_STORAGE &&
+			if (bpf_map_is_cgroup_storage(map) &&
 			    bpf_cgroup_storage_assign(env->prog, map)) {
-				verbose(env,
-					"only one cgroup storage is allowed\n");
+				verbose(env, "only one cgroup storage of each type is allowed\n");
 				fdput(f);
 				return -EBUSY;
 			}