From 14a9b6ca66109fc1231eb16e98a9ce4262fb610c Mon Sep 17 00:00:00 2001 From: "Dmitry V. Levin" Date: Tue, 12 Mar 2019 11:17:20 +0000 Subject: [PATCH] bpf: add support for btf_* fields in BPF_MAP_CREATE * bpf_attr.h (struct BPF_MAP_CREATE_struct): Add btf_fd, btf_key_type_id, and btf_value_type_id fields. * bpf.c (BEGIN_BPF_CMD_DECODER(BPF_MAP_CREATE)): Decode btf_fd, btf_key_type_id, and btf_value_type_id fields introduced by Linux commits v4.18-rc1~114^2~417^2~1^2~3 and v4.18-rc1~114^2~148^2~7^2~2. * tests/bpf.c (BPF_MAP_CREATE_checks): Check it. * tests/bpf-obj_get_info_by_fd.c (print_map_create): Update expected output. --- bpf.c | 10 ++++++++++ bpf_attr.h | 5 ++++- tests/bpf-obj_get_info_by_fd.c | 4 ++++ tests/bpf.c | 20 ++++++++++++++++++++ 4 files changed, 38 insertions(+), 1 deletion(-) diff --git a/bpf.c b/bpf.c index 6fb4c2c2..bf7cd6ca 100644 --- a/bpf.c +++ b/bpf.c @@ -212,6 +212,16 @@ BEGIN_BPF_CMD_DECODER(BPF_MAP_CREATE) if (len <= offsetof(struct BPF_MAP_CREATE_struct, map_ifindex)) break; PRINT_FIELD_IFINDEX(", ", attr, map_ifindex); + + /* + * The following three fields were introduced by Linux commits + * v4.18-rc1~114^2~417^2~1^2~3 and v4.18-rc1~114^2~148^2~7^2~2. + */ + if (len <= offsetof(struct BPF_MAP_CREATE_struct, btf_fd)) + break; + PRINT_FIELD_FD(", ", attr, btf_fd, tcp); + PRINT_FIELD_U(", ", attr, btf_key_type_id); + PRINT_FIELD_U(", ", attr, btf_value_type_id); } END_BPF_CMD_DECODER(RVAL_DECODED | RVAL_FD) diff --git a/bpf_attr.h b/bpf_attr.h index cb498963..a789d10a 100644 --- a/bpf_attr.h +++ b/bpf_attr.h @@ -45,11 +45,14 @@ struct BPF_MAP_CREATE_struct { uint32_t numa_node; char map_name[BPF_OBJ_NAME_LEN]; uint32_t map_ifindex; + uint32_t btf_fd; + uint32_t btf_key_type_id; + uint32_t btf_value_type_id; }; # define BPF_MAP_CREATE_struct_size \ sizeof(struct BPF_MAP_CREATE_struct) -# define expected_BPF_MAP_CREATE_struct_size 48 +# define expected_BPF_MAP_CREATE_struct_size 60 struct BPF_MAP_LOOKUP_ELEM_struct { uint32_t map_fd; diff --git a/tests/bpf-obj_get_info_by_fd.c b/tests/bpf-obj_get_info_by_fd.c index ff06e27d..02d14e5e 100644 --- a/tests/bpf-obj_get_info_by_fd.c +++ b/tests/bpf-obj_get_info_by_fd.c @@ -84,6 +84,10 @@ print_map_create(void *attr_void, size_t size, long rc) printf(", map_name=\"test_map\""); if (size > offsetof(struct BPF_MAP_CREATE_struct, map_ifindex)) printf(", map_ifindex=0"); + if (size > offsetof(struct BPF_MAP_CREATE_struct, btf_fd)) { + printf(", btf_fd=0" + ", btf_key_type_id=0, btf_value_type_id=0"); + } printf("}, %zu) = ", size); if (rc >= 0) printf("%ld\n", rc); diff --git a/tests/bpf.c b/tests/bpf.c index cfed3191..b18a056e 100644 --- a/tests/bpf.c +++ b/tests/bpf.c @@ -400,6 +400,26 @@ static struct bpf_attr_check BPF_MAP_CREATE_checks[] = { ", map_ifindex=" IFINDEX_LO_STR, .init_fn = init_BPF_MAP_CREATE_attr7, }, + { /* 8 */ + .data = { .BPF_MAP_CREATE_data = { + .btf_fd = 0xbadc0ded, + .btf_key_type_id = 0xfacefeed, + .btf_value_type_id = 0xcafef00d + } }, + .size = offsetofend(struct BPF_MAP_CREATE_struct, + btf_value_type_id), + .str = "map_type=BPF_MAP_TYPE_UNSPEC" + ", key_size=0" + ", value_size=0" + ", max_entries=0" + ", map_flags=0" + ", inner_map_fd=0" + ", map_name=\"\"" + ", map_ifindex=0" + ", btf_fd=-1159983635" + ", btf_key_type_id=4207869677" + ", btf_value_type_id=3405705229" + }, }; static const struct bpf_attr_check BPF_MAP_LOOKUP_ELEM_checks[] = { -- 2.40.0