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bpf: Generalize bpf_sk_storage

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Refactor the functionality in bpf_sk_storage.c so that concept of
storage linked to kernel objects can be extended to other objects like
inode, task_struct etc.

Each new local storage will still be a separate map and provide its own
set of helpers. This allows for future object specific extensions and
still share a lot of the underlying implementation.

This includes the changes suggested by Martin in:

  https://lore.kernel.org/bpf/20200725013047.4006241-1-kafai@fb.com/

adding new map operations to support bpf_local_storage maps:

* storages for different kernel objects to optionally have different
  memory charging strategy (map_local_storage_charge,
  map_local_storage_uncharge)
* Functionality to extract the storage pointer from a pointer to the
  owning object (map_owner_storage_ptr)

Co-developed-by: Martin KaFai Lau <kafai@fb.com>

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: KP Singh <kpsingh@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200825182919.1118197-4-kpsingh@chromium.org
This commit is contained in:
KP Singh
2020-08-25 20:29:15 +02:00
committed by Alexei Starovoitov
parent 4cc9ce4e73
commit f836a56e84
5 changed files with 228 additions and 86 deletions
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8
include/uapi/linux/bpf.h
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@@ -3765,9 +3765,13 @@ enum {
BPF_F_SYSCTL_BASE_NAME = (1ULL << 0),
};
/* BPF_FUNC_sk_storage_get flags */
/* BPF_FUNC_<kernel_obj>_storage_get flags */
enum {
BPF_SK_STORAGE_GET_F_CREATE = (1ULL << 0),
BPF_LOCAL_STORAGE_GET_F_CREATE = (1ULL << 0),
/* BPF_SK_STORAGE_GET_F_CREATE is only kept for backward compatibility
* and BPF_LOCAL_STORAGE_GET_F_CREATE must be used instead.
*/
BPF_SK_STORAGE_GET_F_CREATE = BPF_LOCAL_STORAGE_GET_F_CREATE,
};
/* BPF_FUNC_read_branch_records flags. */