On 6/19/20 11:11 PM, Andrey Ignatov wrote:
v1->v2: - move btf id cache to a new bpf_map_ops.map_btf_id field (Martin, Andrii); - don't check btf names for collisions (Martin); - drop btf_find_by_name_kind_next() patch since it was needed only for collision check; - don't fall back to `struct bpf_map` if a map type doesn't specify both map_btf_name and map_btf_id; 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 3 for more details on the feature and use-cases. Other patches: Patch 1 is refactoring to simplify btf_parse_vmlinux(). Patch 2 is a rename to avoid having two different `struct bpf_htab`. Patch 4 enables access to map fields for all map types. Patch 5 adds selftests.
Applied, thanks!
