[PATCH bpf-next 17/35] bpf: eliminate rlimit-based memory accounting for devmap maps

[Roman Gushchin]

Do not use rlimit-based memory accounting for devmap maps.
It has been replaced with the memcg-based memory accounting.

Signed-off-by: Roman Gushchin <g...@fb.com>
---
 kernel/bpf/devmap.c | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index 05bf93088063..8148c7260a54 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -109,8 +109,6 @@ static inline struct hlist_head *dev_map_index_hash(struct 
bpf_dtab *dtab,
 static int dev_map_init_map(struct bpf_dtab *dtab, union bpf_attr *attr)
 {
        u32 valsize = attr->value_size;
-       u64 cost = 0;
-       int err;
 
        /* check sanity of attributes. 2 value sizes supported:
         * 4 bytes: ifindex
@@ -135,21 +133,13 @@ static int dev_map_init_map(struct bpf_dtab *dtab, union 
bpf_attr *attr)
 
                if (!dtab->n_buckets) /* Overflow check */
                        return -EINVAL;
-               cost += (u64) sizeof(struct hlist_head) * dtab->n_buckets;
-       } else {
-               cost += (u64) dtab->map.max_entries * sizeof(struct 
bpf_dtab_netdev *);
        }
 
-       /* if map size is larger than memlock limit, reject it */
-       err = bpf_map_charge_init(&dtab->map.memory, cost);
-       if (err)
-               return -EINVAL;
-
        if (attr->map_type == BPF_MAP_TYPE_DEVMAP_HASH) {
                dtab->dev_index_head = dev_map_create_hash(dtab->n_buckets,
                                                           dtab->map.numa_node);
                if (!dtab->dev_index_head)
-                       goto free_charge;
+                       return -ENOMEM;
 
                spin_lock_init(&dtab->index_lock);
        } else {
@@ -157,14 +147,10 @@ static int dev_map_init_map(struct bpf_dtab *dtab, union 
bpf_attr *attr)
                                                      sizeof(struct 
bpf_dtab_netdev *),
                                                      dtab->map.numa_node);
                if (!dtab->netdev_map)
-                       goto free_charge;
+                       return -ENOMEM;
        }
 
        return 0;
-
-free_charge:
-       bpf_map_charge_finish(&dtab->map.memory);
-       return -ENOMEM;
 }
 
 static struct bpf_map *dev_map_alloc(union bpf_attr *attr)
-- 
2.26.2