summaryrefslogtreecommitdiff
path: root/tools/lib
diff options
context:
space:
mode:
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/.gitignore1
-rw-r--r--tools/lib/bpf/Makefile47
-rw-r--r--tools/lib/bpf/btf.c12
-rw-r--r--tools/lib/bpf/libbpf.c22
-rw-r--r--tools/lib/bpf/xsk.c83
5 files changed, 104 insertions, 61 deletions
diff --git a/tools/lib/bpf/.gitignore b/tools/lib/bpf/.gitignore
index 8a81b3679d2b..5d4cfac671d5 100644
--- a/tools/lib/bpf/.gitignore
+++ b/tools/lib/bpf/.gitignore
@@ -1,7 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
libbpf_version.h
libbpf.pc
-FEATURE-DUMP.libbpf
libbpf.so.*
TAGS
tags
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 55bd78b3496f..887a494ad5fc 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -58,28 +58,7 @@ ifndef VERBOSE
VERBOSE = 0
endif
-FEATURE_USER = .libbpf
-FEATURE_TESTS = libelf zlib bpf
-FEATURE_DISPLAY = libelf zlib bpf
-
INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi
-FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
-
-check_feat := 1
-NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
-ifdef MAKECMDGOALS
-ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
- check_feat := 0
-endif
-endif
-
-ifeq ($(check_feat),1)
-ifeq ($(FEATURES_DUMP),)
-include $(srctree)/tools/build/Makefile.feature
-else
-include $(FEATURES_DUMP)
-endif
-endif
export prefix libdir src obj
@@ -157,7 +136,7 @@ all: fixdep
all_cmd: $(CMD_TARGETS) check
-$(BPF_IN_SHARED): force elfdep zdep bpfdep $(BPF_HELPER_DEFS)
+$(BPF_IN_SHARED): force $(BPF_HELPER_DEFS)
@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
(diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
@@ -175,7 +154,7 @@ $(BPF_IN_SHARED): force elfdep zdep bpfdep $(BPF_HELPER_DEFS)
echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
-$(BPF_IN_STATIC): force elfdep zdep bpfdep $(BPF_HELPER_DEFS)
+$(BPF_IN_STATIC): force $(BPF_HELPER_DEFS)
$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
@@ -264,34 +243,16 @@ install_pkgconfig: $(PC_FILE)
install: install_lib install_pkgconfig install_headers
-### Cleaning rules
-
-config-clean:
- $(call QUIET_CLEAN, feature-detect)
- $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
-
-clean: config-clean
+clean:
$(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
*~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_HELPER_DEFS) \
$(SHARED_OBJDIR) $(STATIC_OBJDIR) \
$(addprefix $(OUTPUT), \
*.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
- $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
-
-
-PHONY += force elfdep zdep bpfdep cscope tags
+PHONY += force cscope tags
force:
-elfdep:
- @if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
-
-zdep:
- @if [ "$(feature-zlib)" != "1" ]; then echo "No zlib found"; exit 1 ; fi
-
-bpfdep:
- @if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
-
cscope:
ls *.c *.h > cscope.files
cscope -b -q -I $(srctree)/include -f cscope.out
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 9970a288dda5..d9c10830d749 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -858,6 +858,7 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
Elf_Scn *scn = NULL;
Elf *elf = NULL;
GElf_Ehdr ehdr;
+ size_t shstrndx;
if (elf_version(EV_CURRENT) == EV_NONE) {
pr_warn("failed to init libelf for %s\n", path);
@@ -882,7 +883,14 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
pr_warn("failed to get EHDR from %s\n", path);
goto done;
}
- if (!elf_rawdata(elf_getscn(elf, ehdr.e_shstrndx), NULL)) {
+
+ if (elf_getshdrstrndx(elf, &shstrndx)) {
+ pr_warn("failed to get section names section index for %s\n",
+ path);
+ goto done;
+ }
+
+ if (!elf_rawdata(elf_getscn(elf, shstrndx), NULL)) {
pr_warn("failed to get e_shstrndx from %s\n", path);
goto done;
}
@@ -897,7 +905,7 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
idx, path);
goto done;
}
- name = elf_strptr(elf, ehdr.e_shstrndx, sh.sh_name);
+ name = elf_strptr(elf, shstrndx, sh.sh_name);
if (!name) {
pr_warn("failed to get section(%d) name from %s\n",
idx, path);
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 2abbc3800568..d43cc3f29dae 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -884,24 +884,24 @@ static int bpf_map__init_kern_struct_ops(struct bpf_map *map,
if (btf_is_ptr(mtype)) {
struct bpf_program *prog;
- mtype = skip_mods_and_typedefs(btf, mtype->type, &mtype_id);
+ prog = st_ops->progs[i];
+ if (!prog)
+ continue;
+
kern_mtype = skip_mods_and_typedefs(kern_btf,
kern_mtype->type,
&kern_mtype_id);
- if (!btf_is_func_proto(mtype) ||
- !btf_is_func_proto(kern_mtype)) {
- pr_warn("struct_ops init_kern %s: non func ptr %s is not supported\n",
+
+ /* mtype->type must be a func_proto which was
+ * guaranteed in bpf_object__collect_st_ops_relos(),
+ * so only check kern_mtype for func_proto here.
+ */
+ if (!btf_is_func_proto(kern_mtype)) {
+ pr_warn("struct_ops init_kern %s: kernel member %s is not a func ptr\n",
map->name, mname);
return -ENOTSUP;
}
- prog = st_ops->progs[i];
- if (!prog) {
- pr_debug("struct_ops init_kern %s: func ptr %s is not set\n",
- map->name, mname);
- continue;
- }
-
prog->attach_btf_id = kern_type_id;
prog->expected_attach_type = kern_member_idx;
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index e3e41ceeb1bc..ffbb588724d8 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c
@@ -46,6 +46,11 @@
#define PF_XDP AF_XDP
#endif
+enum xsk_prog {
+ XSK_PROG_FALLBACK,
+ XSK_PROG_REDIRECT_FLAGS,
+};
+
struct xsk_umem {
struct xsk_ring_prod *fill_save;
struct xsk_ring_cons *comp_save;
@@ -351,6 +356,54 @@ int xsk_umem__create_v0_0_2(struct xsk_umem **umem_ptr, void *umem_area,
COMPAT_VERSION(xsk_umem__create_v0_0_2, xsk_umem__create, LIBBPF_0.0.2)
DEFAULT_VERSION(xsk_umem__create_v0_0_4, xsk_umem__create, LIBBPF_0.0.4)
+static enum xsk_prog get_xsk_prog(void)
+{
+ enum xsk_prog detected = XSK_PROG_FALLBACK;
+ struct bpf_load_program_attr prog_attr;
+ struct bpf_create_map_attr map_attr;
+ __u32 size_out, retval, duration;
+ char data_in = 0, data_out;
+ struct bpf_insn insns[] = {
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, XDP_PASS),
+ BPF_EMIT_CALL(BPF_FUNC_redirect_map),
+ BPF_EXIT_INSN(),
+ };
+ int prog_fd, map_fd, ret;
+
+ memset(&map_attr, 0, sizeof(map_attr));
+ map_attr.map_type = BPF_MAP_TYPE_XSKMAP;
+ map_attr.key_size = sizeof(int);
+ map_attr.value_size = sizeof(int);
+ map_attr.max_entries = 1;
+
+ map_fd = bpf_create_map_xattr(&map_attr);
+ if (map_fd < 0)
+ return detected;
+
+ insns[0].imm = map_fd;
+
+ memset(&prog_attr, 0, sizeof(prog_attr));
+ prog_attr.prog_type = BPF_PROG_TYPE_XDP;
+ prog_attr.insns = insns;
+ prog_attr.insns_cnt = ARRAY_SIZE(insns);
+ prog_attr.license = "GPL";
+
+ prog_fd = bpf_load_program_xattr(&prog_attr, NULL, 0);
+ if (prog_fd < 0) {
+ close(map_fd);
+ return detected;
+ }
+
+ ret = bpf_prog_test_run(prog_fd, 0, &data_in, 1, &data_out, &size_out, &retval, &duration);
+ if (!ret && retval == XDP_PASS)
+ detected = XSK_PROG_REDIRECT_FLAGS;
+ close(prog_fd);
+ close(map_fd);
+ return detected;
+}
+
static int xsk_load_xdp_prog(struct xsk_socket *xsk)
{
static const int log_buf_size = 16 * 1024;
@@ -358,7 +411,7 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk)
char log_buf[log_buf_size];
int err, prog_fd;
- /* This is the C-program:
+ /* This is the fallback C-program:
* SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx)
* {
* int ret, index = ctx->rx_queue_index;
@@ -414,9 +467,31 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk)
/* The jumps are to this instruction */
BPF_EXIT_INSN(),
};
- size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
- prog_fd = bpf_load_program(BPF_PROG_TYPE_XDP, prog, insns_cnt,
+ /* This is the post-5.3 kernel C-program:
+ * SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx)
+ * {
+ * return bpf_redirect_map(&xsks_map, ctx->rx_queue_index, XDP_PASS);
+ * }
+ */
+ struct bpf_insn prog_redirect_flags[] = {
+ /* r2 = *(u32 *)(r1 + 16) */
+ BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 16),
+ /* r1 = xskmap[] */
+ BPF_LD_MAP_FD(BPF_REG_1, ctx->xsks_map_fd),
+ /* r3 = XDP_PASS */
+ BPF_MOV64_IMM(BPF_REG_3, 2),
+ /* call bpf_redirect_map */
+ BPF_EMIT_CALL(BPF_FUNC_redirect_map),
+ BPF_EXIT_INSN(),
+ };
+ size_t insns_cnt[] = {sizeof(prog) / sizeof(struct bpf_insn),
+ sizeof(prog_redirect_flags) / sizeof(struct bpf_insn),
+ };
+ struct bpf_insn *progs[] = {prog, prog_redirect_flags};
+ enum xsk_prog option = get_xsk_prog();
+
+ prog_fd = bpf_load_program(BPF_PROG_TYPE_XDP, progs[option], insns_cnt[option],
"LGPL-2.1 or BSD-2-Clause", 0, log_buf,
log_buf_size);
if (prog_fd < 0) {
@@ -442,7 +517,7 @@ static int xsk_get_max_queues(struct xsk_socket *xsk)
struct ifreq ifr = {};
int fd, err, ret;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
+ fd = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (fd < 0)
return -errno;
generated by cgit v1.2.3 (git 2.46.0) at 2026-01-28 11:21:06 +0000