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From:   Roman Gushchin <guro@fb.com>
To:     <bpf@vger.kernel.org>
CC:     <ast@kernel.org>, <daniel@iogearbox.net>, <netdev@vger.kernel.org>,
        <andrii@kernel.org>, <akpm@linux-foundation.org>,
        <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
        <kernel-team@fb.com>
Subject: [PATCH bpf-next v8 22/34] bpf: eliminate rlimit-based memory accounting for devmap maps
Date:   Tue, 24 Nov 2020 19:01:07 -0800
Message-ID: <20201125030119.2864302-23-guro@fb.com>
In-Reply-To: <20201125030119.2864302-1-guro@fb.com>
References: <20201125030119.2864302-1-guro@fb.com>
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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 <guro@fb.com>
Acked-by: Song Liu <songliubraving@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 a4dfe544946f..1fdeb7225111 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -109,8 +109,6 @@ static inline struct hlist_head *dev_map_index_hash(s=
truct bpf_dtab *dtab,
 static int dev_map_init_map(struct bpf_dtab *dtab, union bpf_attr *attr)
 {
 	u32 valsize =3D attr->value_size;
-	u64 cost =3D 0;
-	int err;
=20
 	/* 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)
=20
 		if (!dtab->n_buckets) /* Overflow check */
 			return -EINVAL;
-		cost +=3D (u64) sizeof(struct hlist_head) * dtab->n_buckets;
-	} else {
-		cost +=3D (u64) dtab->map.max_entries * sizeof(struct bpf_dtab_netdev =
*);
 	}
=20
-	/* if map size is larger than memlock limit, reject it */
-	err =3D bpf_map_charge_init(&dtab->map.memory, cost);
-	if (err)
-		return -EINVAL;
-
 	if (attr->map_type =3D=3D BPF_MAP_TYPE_DEVMAP_HASH) {
 		dtab->dev_index_head =3D dev_map_create_hash(dtab->n_buckets,
 							   dtab->map.numa_node);
 		if (!dtab->dev_index_head)
-			goto free_charge;
+			return -ENOMEM;
=20
 		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;
 	}
=20
 	return 0;
-
-free_charge:
-	bpf_map_charge_finish(&dtab->map.memory);
-	return -ENOMEM;
 }
=20
 static struct bpf_map *dev_map_alloc(union bpf_attr *attr)
--=20
2.26.2