From: Andrey Ignatov <rdna@fb.com>
To: <bpf@vger.kernel.org>
Cc: Andrey Ignatov <rdna@fb.com>, <ast@kernel.org>,
<daniel@iogearbox.net>, <kafai@fb.com>, <kernel-team@fb.com>
Subject: [PATCH bpf-next 0/6] bpf: Support access to bpf map fields
Date: Wed, 17 Jun 2020 13:43:41 -0700 [thread overview]
Message-ID: <cover.1592426215.git.rdna@fb.com> (raw)
This patch set adds support to access bpf map fields from bpf programs
using btf_struct_access().
That way a program can cast a pointer to map to either `struct bpf_map *`
or map type specific struct pointer such as `struct bpf_array *` or
`struct bpf_htab *`, and access necessary fields, e.g. map->max_entries.
The fields, in turn, should be defined by a user provided struct with
preserve_access_index attribute or included from vmlinux.h.
Please see patch 4 for more details on the feature and use-cases.
Other patches:
Patch 1 is refactoring to simplify btf_parse_vmlinux().
Patch 2 introduces a new function to simplify iteration over btf.
Patch 3 is a rename to avoid having two different `struct bpf_htab`.
Patch 5 enables access to map fields for all map types.
Patch 6 adds selftests.
Andrey Ignatov (6):
bpf: Switch btf_parse_vmlinux to btf_find_by_name_kind
bpf: Introduce btf_find_by_name_kind_next()
bpf: Rename bpf_htab to bpf_shtab in sock_map
bpf: Support access to bpf map fields
bpf: Set map_btf_name for all map types
selftests/bpf: Test access to bpf map pointer
include/linux/bpf.h | 8 +
include/linux/bpf_verifier.h | 1 +
include/linux/btf.h | 2 +
kernel/bpf/arraymap.c | 6 +
kernel/bpf/bpf_struct_ops.c | 1 +
kernel/bpf/btf.c | 97 ++-
kernel/bpf/cpumap.c | 1 +
kernel/bpf/devmap.c | 2 +
kernel/bpf/hashtab.c | 5 +
kernel/bpf/local_storage.c | 1 +
kernel/bpf/lpm_trie.c | 1 +
kernel/bpf/queue_stack_maps.c | 2 +
kernel/bpf/reuseport_array.c | 1 +
kernel/bpf/ringbuf.c | 1 +
kernel/bpf/stackmap.c | 1 +
kernel/bpf/verifier.c | 77 +-
net/core/bpf_sk_storage.c | 1 +
net/core/sock_map.c | 84 +--
net/xdp/xskmap.c | 1 +
.../selftests/bpf/prog_tests/map_ptr.c | 32 +
.../selftests/bpf/progs/map_ptr_kern.c | 686 ++++++++++++++++++
.../testing/selftests/bpf/verifier/map_ptr.c | 62 ++
.../selftests/bpf/verifier/map_ptr_mixing.c | 2 +-
23 files changed, 1007 insertions(+), 68 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/map_ptr.c
create mode 100644 tools/testing/selftests/bpf/progs/map_ptr_kern.c
create mode 100644 tools/testing/selftests/bpf/verifier/map_ptr.c
--
2.24.1
next reply other threads:[~2020-06-17 20:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-17 20:43 Andrey Ignatov [this message]
2020-06-17 20:43 ` [PATCH bpf-next 1/6] bpf: Switch btf_parse_vmlinux to btf_find_by_name_kind Andrey Ignatov
2020-06-19 4:45 ` Andrii Nakryiko
2020-06-17 20:43 ` [PATCH bpf-next 2/6] bpf: Introduce btf_find_by_name_kind_next() Andrey Ignatov
2020-06-17 20:43 ` [PATCH bpf-next 3/6] bpf: Rename bpf_htab to bpf_shtab in sock_map Andrey Ignatov
2020-06-17 20:43 ` [PATCH bpf-next 4/6] bpf: Support access to bpf map fields Andrey Ignatov
2020-06-18 6:18 ` [Potential Spoof] " Martin KaFai Lau
2020-06-18 19:42 ` Andrey Ignatov
2020-06-18 21:03 ` Martin KaFai Lau
2020-06-18 23:51 ` Andrey Ignatov
2020-06-19 0:07 ` Andrii Nakryiko
2020-06-19 0:27 ` Andrey Ignatov
2020-06-19 1:11 ` Martin KaFai Lau
2020-06-19 1:53 ` Andrey Ignatov
2020-06-17 20:43 ` [PATCH bpf-next 5/6] bpf: Set map_btf_name for all map types Andrey Ignatov
2020-06-17 20:43 ` [PATCH bpf-next 6/6] selftests/bpf: Test access to bpf map pointer Andrey Ignatov
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