This patchset adds map-in-map support (map->map). One use case is the (vips -> webservers) in the L4 load balancer so that different vips can be backed by different set of webservers.
Please refer to the individual commit log for details. Martin KaFai Lau (4): bpf: Fix and simplifications on inline map lookup bpf: Add array of maps support bpf: Add hash of maps support bpf: Add tests for map-in-map include/linux/bpf.h | 3 + include/uapi/linux/bpf.h | 3 + kernel/bpf/Makefile | 2 +- kernel/bpf/arraymap.c | 74 ++++++++++-- kernel/bpf/hashtab.c | 121 +++++++++++++++++++ kernel/bpf/map_in_map.c | 97 ++++++++++++++++ kernel/bpf/map_in_map.h | 23 ++++ kernel/bpf/syscall.c | 13 ++- kernel/bpf/verifier.c | 57 +++++++-- samples/bpf/Makefile | 4 + samples/bpf/bpf_helpers.h | 1 + samples/bpf/bpf_load.c | 22 +++- samples/bpf/test_map_in_map_kern.c | 173 ++++++++++++++++++++++++++++ samples/bpf/test_map_in_map_user.c | 116 +++++++++++++++++++ tools/include/uapi/linux/bpf.h | 3 + tools/lib/bpf/bpf.c | 17 +++ tools/lib/bpf/bpf.h | 2 + tools/testing/selftests/bpf/test_verifier.c | 131 ++++++++++++++++++--- 18 files changed, 823 insertions(+), 39 deletions(-) create mode 100644 kernel/bpf/map_in_map.c create mode 100644 kernel/bpf/map_in_map.h create mode 100644 samples/bpf/test_map_in_map_kern.c create mode 100644 samples/bpf/test_map_in_map_user.c -- 2.9.3
