From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: davem@davemloft.net
Cc: daniel@iogearbox.net, andrii@kernel.org, tj@kernel.org,
memxor@gmail.com, delyank@fb.com, linux-mm@kvack.org,
bpf@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH v4 bpf-next 14/15] bpf: Remove prealloc-only restriction for sleepable bpf programs.
Date: Thu, 25 Aug 2022 19:44:29 -0700 [thread overview]
Message-ID: <20220826024430.84565-15-alexei.starovoitov@gmail.com> (raw)
In-Reply-To: <20220826024430.84565-1-alexei.starovoitov@gmail.com>
From: Alexei Starovoitov <ast@kernel.org>
Since hash map is now converted to bpf_mem_alloc and it's waiting for rcu and
rcu_tasks_trace GPs before freeing elements into global memory slabs it's safe
to use dynamically allocated hash maps in sleepable bpf programs.
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
kernel/bpf/verifier.c | 23 -----------------------
1 file changed, 23 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 57ec06b1d09d..068b20ed34d2 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -12586,14 +12586,6 @@ static int check_pseudo_btf_id(struct bpf_verifier_env *env,
return err;
}
-static int check_map_prealloc(struct bpf_map *map)
-{
- return (map->map_type != BPF_MAP_TYPE_HASH &&
- map->map_type != BPF_MAP_TYPE_PERCPU_HASH &&
- map->map_type != BPF_MAP_TYPE_HASH_OF_MAPS) ||
- !(map->map_flags & BPF_F_NO_PREALLOC);
-}
-
static bool is_tracing_prog_type(enum bpf_prog_type type)
{
switch (type) {
@@ -12608,15 +12600,6 @@ static bool is_tracing_prog_type(enum bpf_prog_type type)
}
}
-static bool is_preallocated_map(struct bpf_map *map)
-{
- if (!check_map_prealloc(map))
- return false;
- if (map->inner_map_meta && !check_map_prealloc(map->inner_map_meta))
- return false;
- return true;
-}
-
static int check_map_prog_compatibility(struct bpf_verifier_env *env,
struct bpf_map *map,
struct bpf_prog *prog)
@@ -12669,12 +12652,6 @@ static int check_map_prog_compatibility(struct bpf_verifier_env *env,
case BPF_MAP_TYPE_LRU_PERCPU_HASH:
case BPF_MAP_TYPE_ARRAY_OF_MAPS:
case BPF_MAP_TYPE_HASH_OF_MAPS:
- if (!is_preallocated_map(map)) {
- verbose(env,
- "Sleepable programs can only use preallocated maps\n");
- return -EINVAL;
- }
- break;
case BPF_MAP_TYPE_RINGBUF:
case BPF_MAP_TYPE_INODE_STORAGE:
case BPF_MAP_TYPE_SK_STORAGE:
--
2.30.2
next prev parent reply other threads:[~2022-08-26 2:45 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-26 2:44 [PATCH v4 bpf-next 00/15] bpf: BPF specific memory allocator Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 01/15] bpf: Introduce any context " Alexei Starovoitov
2022-08-29 21:30 ` Daniel Borkmann
2022-08-29 21:45 ` Alexei Starovoitov
2022-08-29 21:59 ` Daniel Borkmann
2022-08-29 22:04 ` Alexei Starovoitov
2022-08-29 22:39 ` Martin KaFai Lau
2022-08-29 22:42 ` Alexei Starovoitov
2022-08-29 22:59 ` Kumar Kartikeya Dwivedi
2022-08-29 23:13 ` Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 02/15] bpf: Convert hash map to bpf_mem_alloc Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 03/15] selftests/bpf: Improve test coverage of test_maps Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 04/15] samples/bpf: Reduce syscall overhead in map_perf_test Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 05/15] bpf: Relax the requirement to use preallocated hash maps in tracing progs Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 06/15] bpf: Optimize element count in non-preallocated hash map Alexei Starovoitov
2022-08-29 21:47 ` Daniel Borkmann
2022-08-29 21:57 ` Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 07/15] bpf: Optimize call_rcu " Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 08/15] bpf: Adjust low/high watermarks in bpf_mem_cache Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 09/15] bpf: Batch call_rcu callbacks instead of SLAB_TYPESAFE_BY_RCU Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 10/15] bpf: Add percpu allocation support to bpf_mem_alloc Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 11/15] bpf: Convert percpu hash map to per-cpu bpf_mem_alloc Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 12/15] bpf: Remove tracing program restriction on map types Alexei Starovoitov
2022-08-26 2:44 ` [PATCH v4 bpf-next 13/15] bpf: Prepare bpf_mem_alloc to be used by sleepable bpf programs Alexei Starovoitov
2022-08-26 2:44 ` Alexei Starovoitov [this message]
2022-08-26 2:44 ` [PATCH v4 bpf-next 15/15] bpf: Introduce sysctl kernel.bpf_force_dyn_alloc Alexei Starovoitov
[not found] ` <f0e3e3ab-99b7-4d87-4b5a-b71ca7724310@iogearbox.net>
2022-08-29 22:27 ` Alexei Starovoitov
2022-08-27 16:57 ` [PATCH v4 bpf-next 00/15] bpf: BPF specific memory allocator Andrii Nakryiko
2022-08-27 22:53 ` Kumar Kartikeya Dwivedi
2022-08-29 15:47 ` Alexei Starovoitov
2022-09-09 20:10 ` Andrii Nakryiko
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