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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: davem@davemloft.net
Cc: daniel@iogearbox.net, andrii@kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH v7 bpf-next 06/11] bpf: Remember BTF of inner maps.
Date: Wed, 14 Jul 2021 17:54:12 -0700	[thread overview]
Message-ID: <20210715005417.78572-7-alexei.starovoitov@gmail.com> (raw)
In-Reply-To: <20210715005417.78572-1-alexei.starovoitov@gmail.com>

From: Alexei Starovoitov <ast@kernel.org>

BTF is required for 'struct bpf_timer' to be recognized inside map value.
The bpf timers are supported inside inner maps.
Remember 'struct btf *' in inner_map_meta to make it available
to the verifier in the sequence:

struct bpf_map *inner_map = bpf_map_lookup_elem(&outer_map, ...);
if (inner_map)
    timer = bpf_map_lookup_elem(&inner_map, ...);

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
---
 kernel/bpf/map_in_map.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/bpf/map_in_map.c b/kernel/bpf/map_in_map.c
index 890dfe14e731..5cd8f5277279 100644
--- a/kernel/bpf/map_in_map.c
+++ b/kernel/bpf/map_in_map.c
@@ -3,6 +3,7 @@
  */
 #include <linux/slab.h>
 #include <linux/bpf.h>
+#include <linux/btf.h>
 
 #include "map_in_map.h"
 
@@ -51,6 +52,10 @@ struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
 	inner_map_meta->max_entries = inner_map->max_entries;
 	inner_map_meta->spin_lock_off = inner_map->spin_lock_off;
 	inner_map_meta->timer_off = inner_map->timer_off;
+	if (inner_map->btf) {
+		btf_get(inner_map->btf);
+		inner_map_meta->btf = inner_map->btf;
+	}
 
 	/* Misc members not needed in bpf_map_meta_equal() check. */
 	inner_map_meta->ops = inner_map->ops;
@@ -66,6 +71,7 @@ struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
 
 void bpf_map_meta_free(struct bpf_map *map_meta)
 {
+	btf_put(map_meta->btf);
 	kfree(map_meta);
 }
 
-- 
2.30.2


  parent reply	other threads:[~2021-07-15  0:54 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15  0:54 [PATCH v7 bpf-next 00/11] bpf: Introduce BPF timers Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 01/11] bpf: Prepare bpf_prog_put() to be called from irq context Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 02/11] bpf: Factor out bpf_spin_lock into helpers Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 03/11] bpf: Introduce bpf timers Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 04/11] bpf: Add map side support for " Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 05/11] bpf: Prevent pointer mismatch in bpf_timer_init Alexei Starovoitov
2021-07-15  0:54 ` Alexei Starovoitov [this message]
2021-07-15  0:54 ` [PATCH v7 bpf-next 07/11] bpf: Relax verifier recursion check Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 08/11] bpf: Implement verifier support for validation of async callbacks Alexei Starovoitov
2022-01-04 17:15   ` Kris Van Hees
2022-01-04 18:19     ` Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 09/11] bpf: Teach stack depth check about " Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 10/11] selftests/bpf: Add bpf_timer test Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 11/11] selftests/bpf: Add a test with bpf_timer in inner map Alexei Starovoitov
2021-07-15 20:40 ` [PATCH v7 bpf-next 00/11] bpf: Introduce BPF timers patchwork-bot+netdevbpf

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