netdev - [PATCH bpf-next v2 25/35] bpf: eliminate rlimit-based memory accounting for socket storage maps

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Date:   Mon, 27 Jul 2020 11:44:56 -0700
From:   Roman Gushchin <guro@...com>
To:     <bpf@...r.kernel.org>
CC:     <netdev@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        <linux-kernel@...r.kernel.org>, Roman Gushchin <guro@...com>
Subject: [PATCH bpf-next v2 25/35] bpf: eliminate rlimit-based memory accounting for socket storage maps

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

Signed-off-by: Roman Gushchin <guro@...com>
---
 net/core/bpf_sk_storage.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c
index fbcd03cd00d3..c0a35b6368af 100644
--- a/net/core/bpf_sk_storage.c
+++ b/net/core/bpf_sk_storage.c
@@ -676,8 +676,6 @@ static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
 	struct bpf_sk_storage_map *smap;
 	unsigned int i;
 	u32 nbuckets;
-	u64 cost;
-	int ret;
 
 	smap = kzalloc(sizeof(*smap), GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
 	if (!smap)
@@ -688,18 +686,9 @@ static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
 	/* Use at least 2 buckets, select_bucket() is undefined behavior with 1 bucket */
 	nbuckets = max_t(u32, 2, nbuckets);
 	smap->bucket_log = ilog2(nbuckets);
-	cost = sizeof(*smap->buckets) * nbuckets + sizeof(*smap);
-
-	ret = bpf_map_charge_init(&smap->map.memory, cost);
-	if (ret < 0) {
-		kfree(smap);
-		return ERR_PTR(ret);
-	}
-
 	smap->buckets = kvcalloc(sizeof(*smap->buckets), nbuckets,
 				 GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
 	if (!smap->buckets) {
-		bpf_map_charge_finish(&smap->map.memory);
 		kfree(smap);
 		return ERR_PTR(-ENOMEM);
 	}
-- 
2.26.2