A single BPF_OBJ_GET_INFO_BY_FD cmd is used to obtain the info for both bpf_prog and bpf_map. The kernel can figure out the fd is associated with a bpf_prog or bpf_map. The suggested struct bpf_prog_info and struct bpf_map_info are not meant to be a complete list and it is not the goal of this patch. New fields can be added in the future patch. The focus of this patch is to create the interface, BPF_OBJ_GET_INFO_BY_FD cmd for exposing the bpf_prog's and bpf_map's info. The obj's info, which will be extended (and get bigger) over time, is separated from the bpf_attr to avoid bloating the bpf_attr.
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| @@ -86,6 +86,7 @@ enum bpf_cmd { · 85 unmodified lines | ||
| 86 | 86 | BPF_MAP_GET_NEXT_ID, |
| 87 | 87 | BPF_PROG_GET_FD_BY_ID, |
| 88 | 88 | BPF_MAP_GET_FD_BY_ID, |
| 89 | + BPF_OBJ_GET_INFO_BY_FD, | |
| 89 | 90 | }; |
| 90 | 91 | |
| 91 | 92 | enum bpf_map_type { |
| @@ -222,6 +223,12 @@ union bpf_attr { · 130 unmodified lines | ||
| 222 | 223 | }; |
| 223 | 224 | __u32 next_id; |
| 224 | 225 | }; |
| 226 | + | |
| 227 | + struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */ | |
| 228 | + __u32 bpf_fd; | |
| 229 | + __u32 info_len; | |
| 230 | + __aligned_u64 info; | |
| 231 | + } info; | |
| 225 | 232 | } __attribute__((aligned(8))); |
| 226 | 233 | |
| 227 | 234 | /* BPF helper function descriptions: |
| @@ -686,4 +693,25 @@ struct xdp_md { · 458 unmodified lines | ||
| 686 | 693 | __u32 data_end; |
| 687 | 694 | }; |
| 688 | 695 | |
| 696 | +#define BPF_TAG_SIZE 8 | |
| 697 | + | |
| 698 | +struct bpf_prog_info { | |
| 699 | + __u32 type; | |
| 700 | + __u32 id; | |
| 701 | + __u8 tag[BPF_TAG_SIZE]; | |
| 702 | + __u32 jited_prog_len; | |
| 703 | + __u32 xlated_prog_len; | |
| 704 | + __aligned_u64 jited_prog_insns; | |
| 705 | + __aligned_u64 xlated_prog_insns; | |
| 706 | +} __attribute__((aligned(8))); | |
| 707 | + | |
| 708 | +struct bpf_map_info { | |
| 709 | + __u32 type; | |
| 710 | + __u32 id; | |
| 711 | + __u32 key_size; | |
| 712 | + __u32 value_size; | |
| 713 | + __u32 max_entries; | |
| 714 | + __u32 map_flags; | |
| 715 | +} __attribute__((aligned(8))); | |
| 716 | + | |
| 689 | 717 | #endif /* _UAPI__LINUX_BPF_H__ */ |