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From 14a9b6ca66109fc1231eb16e98a9ce4262fb610c Mon Sep 17 00:00:00 2001
From: "Dmitry V. Levin" <ldv@altlinux.org>
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(-)
Index: strace-4.24/bpf.c
===================================================================
--- strace-4.24.orig/bpf.c 2020-01-28 00:14:36.905228319 +0100
+++ strace-4.24/bpf.c 2020-01-28 00:15:26.973756792 +0100
@@ -212,6 +212,16 @@
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)
Index: strace-4.24/bpf_attr.h
===================================================================
--- strace-4.24.orig/bpf_attr.h 2020-01-28 00:14:36.905228319 +0100
+++ strace-4.24/bpf_attr.h 2020-01-28 00:15:26.974756783 +0100
@@ -45,11 +45,14 @@
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;
Index: strace-4.24/tests/bpf-obj_get_info_by_fd.c
===================================================================
--- strace-4.24.orig/tests/bpf-obj_get_info_by_fd.c 2020-01-28 00:14:36.905228319 +0100
+++ strace-4.24/tests/bpf-obj_get_info_by_fd.c 2020-01-28 00:15:26.974756783 +0100
@@ -84,6 +84,10 @@
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</dev/null>"
+ ", btf_key_type_id=0, btf_value_type_id=0");
+ }
printf("}, %zu) = ", size);
if (rc >= 0)
printf("%ld<anon_inode:bpf-map>\n", rc);
Index: strace-4.24/tests/bpf.c
===================================================================
--- strace-4.24.orig/tests/bpf.c 2020-01-28 00:14:36.905228319 +0100
+++ strace-4.24/tests/bpf.c 2020-01-28 00:15:26.975756773 +0100
@@ -400,6 +400,26 @@
", 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[] = {
Index: strace-4.24/tests-m32/bpf-obj_get_info_by_fd.c
===================================================================
--- strace-4.24.orig/tests-m32/bpf-obj_get_info_by_fd.c 2020-01-28 00:15:16.441855977 +0100
+++ strace-4.24/tests-m32/bpf-obj_get_info_by_fd.c 2020-01-28 00:15:51.739523557 +0100
@@ -84,6 +84,10 @@
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</dev/null>"
+ ", btf_key_type_id=0, btf_value_type_id=0");
+ }
printf("}, %zu) = ", size);
if (rc >= 0)
printf("%ld<anon_inode:bpf-map>\n", rc);
Index: strace-4.24/tests-m32/bpf.c
===================================================================
--- strace-4.24.orig/tests-m32/bpf.c 2020-01-28 00:15:08.917926835 +0100
+++ strace-4.24/tests-m32/bpf.c 2020-01-28 00:15:45.840579111 +0100
@@ -400,6 +400,26 @@
", 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[] = {
Index: strace-4.24/tests-mx32/bpf-obj_get_info_by_fd.c
===================================================================
--- strace-4.24.orig/tests-mx32/bpf-obj_get_info_by_fd.c 2020-01-28 00:15:18.824833536 +0100
+++ strace-4.24/tests-mx32/bpf-obj_get_info_by_fd.c 2020-01-28 00:15:55.110491811 +0100
@@ -84,6 +84,10 @@
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</dev/null>"
+ ", btf_key_type_id=0, btf_value_type_id=0");
+ }
printf("}, %zu) = ", size);
if (rc >= 0)
printf("%ld<anon_inode:bpf-map>\n", rc);
Index: strace-4.24/tests-mx32/bpf.c
===================================================================
--- strace-4.24.orig/tests-mx32/bpf.c 2020-01-28 00:15:10.852908612 +0100
+++ strace-4.24/tests-mx32/bpf.c 2020-01-28 00:15:48.667552488 +0100
@@ -400,6 +400,26 @@
", 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[] = {
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