Three new libbpf APIs are added to support bpf_iter:
- bpf_program__attach_iter
Given a bpf program and additional parameters, which is
none now, returns a bpf_link.
- bpf_link__create_iter
Given a bpf_link, create a bpf_iter and return a fd
so user can then do read() to get seq_file output data.
- bpf_iter_create
syscall level API to create a bpf iterator.
Two macros, BPF_SEQ_PRINTF0 and BPF_SEQ_PRINTF, are also introduced.
These two macros can help bpf program writers with
nicer bpf_seq_printf syntax similar to the kernel one.
Signed-off-by: Yonghong Song <yhs@xxxxxx>
---
tools/lib/bpf/bpf.c | 11 +++++++
tools/lib/bpf/bpf.h | 2 ++
tools/lib/bpf/bpf_tracing.h | 23 ++++++++++++++
tools/lib/bpf/libbpf.c | 60 +++++++++++++++++++++++++++++++++++++
tools/lib/bpf/libbpf.h | 11 +++++++
tools/lib/bpf/libbpf.map | 7 +++++
6 files changed, 114 insertions(+)
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 5cc1b0785d18..7ffd6c0ad95f 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -619,6 +619,17 @@ int bpf_link_update(int link_fd, int new_prog_fd,
return sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr));
}
+int bpf_iter_create(int link_fd, unsigned int flags)
+{
+ union bpf_attr attr;
+
+ memset(&attr, 0, sizeof(attr));
+ attr.iter_create.link_fd = link_fd;
+ attr.iter_create.flags = flags;
+
+ return sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr));
+}
+
int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
__u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
{
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 46d47afdd887..db9df303090e 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -187,6 +187,8 @@ struct bpf_link_update_opts {
LIBBPF_API int bpf_link_update(int link_fd, int new_prog_fd,
const struct bpf_link_update_opts *opts);
+LIBBPF_API int bpf_iter_create(int link_fd, unsigned int flags);
+
struct bpf_prog_test_run_attr {
int prog_fd;
int repeat;
diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index f3f3c3fb98cb..4a6dffaa7e57 100644
--- a/tools/lib/bpf/bpf_tracing.h
+++ b/tools/lib/bpf/bpf_tracing.h
@@ -413,4 +413,27 @@ typeof(name(0)) name(struct pt_regs *ctx) \
} \
static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args)
+/*
+ * BPF_SEQ_PRINTF to wrap bpf_seq_printf to-be-printed values
+ * in a structure. BPF_SEQ_PRINTF0 is a simple wrapper for
+ * bpf_seq_printf().
+ */
+#define BPF_SEQ_PRINTF0(seq, fmt) \
+ ({ \
+ int ret = bpf_seq_printf(seq, fmt, sizeof(fmt), \
+ (void *)0, 0); \
+ ret; \
+ })
+
+#define BPF_SEQ_PRINTF(seq, fmt, args...) \
+ ({ \
+ _Pragma("GCC diagnostic push") \
+ _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
+ __u64 param[___bpf_narg(args)] = { args }; \
+ _Pragma("GCC diagnostic pop") \
+ int ret = bpf_seq_printf(seq, fmt, sizeof(fmt), \
+ param, sizeof(param)); \
+ ret; \
+ })
+
#endif
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 8e1dc6980fac..ffdc4d8e0cc0 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -6366,6 +6366,9 @@ static const struct bpf_sec_def section_defs[] = {
.is_attach_btf = true,
.expected_attach_type = BPF_LSM_MAC,
.attach_fn = attach_lsm),
+ SEC_DEF("iter/", TRACING,
+ .expected_attach_type = BPF_TRACE_ITER,
+ .is_attach_btf = true),
BPF_PROG_SEC("xdp", BPF_PROG_TYPE_XDP),
BPF_PROG_SEC("perf_event", BPF_PROG_TYPE_PERF_EVENT),
BPF_PROG_SEC("lwt_in", BPF_PROG_TYPE_LWT_IN),
@@ -6629,6 +6632,7 @@ static int bpf_object__collect_struct_ops_map_reloc(struct bpf_object *obj,
#define BTF_TRACE_PREFIX "btf_trace_"
#define BTF_LSM_PREFIX "bpf_lsm_"
+#define BTF_ITER_PREFIX "__bpf_iter__"
#define BTF_MAX_NAME_SIZE 128
static int find_btf_by_prefix_kind(const struct btf *btf, const char *prefix,
@@ -6659,6 +6663,9 @@ static inline int __find_vmlinux_btf_id(struct btf *btf, const char *name,
else if (attach_type == BPF_LSM_MAC)
err = find_btf_by_prefix_kind(btf, BTF_LSM_PREFIX, name,
BTF_KIND_FUNC);
+ else if (attach_type == BPF_TRACE_ITER)
+ err = find_btf_by_prefix_kind(btf, BTF_ITER_PREFIX, name,
+ BTF_KIND_FUNC);
else
err = btf__find_by_name_kind(btf, name, BTF_KIND_FUNC);
@@ -7617,6 +7624,59 @@ bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd)
return link;
}
+struct bpf_link *
+bpf_program__attach_iter(struct bpf_program *prog,
+ const struct bpf_iter_attach_opts *opts)
+{
+ enum bpf_attach_type attach_type;
+ char errmsg[STRERR_BUFSIZE];
+ struct bpf_link *link;
+ int prog_fd, link_fd;
+
+ if (!OPTS_VALID(opts, bpf_iter_attach_opts))
+ return ERR_PTR(-EINVAL);
+
+ prog_fd = bpf_program__fd(prog);
+ if (prog_fd < 0) {
+ pr_warn("program '%s': can't attach before loaded\n",
+ bpf_program__title(prog, false));
+ return ERR_PTR(-EINVAL);
+ }
+
+ link = calloc(1, sizeof(*link));
+ if (!link)
+ return ERR_PTR(-ENOMEM);
+ link->detach = &bpf_link__detach_fd;
+
+ attach_type = bpf_program__get_expected_attach_type(prog);
+ link_fd = bpf_link_create(prog_fd, 0, attach_type, NULL);
+ if (link_fd < 0) {
+ link_fd = -errno;
+ free(link);
+ pr_warn("program '%s': failed to attach to iterator: %s\n",
+ bpf_program__title(prog, false),
+ libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg)));
+ return ERR_PTR(link_fd);
+ }
+ link->fd = link_fd;
+ return link;
+}
+
+int bpf_link__create_iter(struct bpf_link *link, unsigned int flags)
+{
+ char errmsg[STRERR_BUFSIZE];
+ int iter_fd;
+
+ iter_fd = bpf_iter_create(bpf_link__fd(link), flags);
+ if (iter_fd < 0) {
+ iter_fd = -errno;
+ pr_warn("failed to create an iterator: %s\n",
+ libbpf_strerror_r(iter_fd, errmsg, sizeof(errmsg)));
+ }
+
+ return iter_fd;
+}
+
struct bpf_link *bpf_program__attach(struct bpf_program *prog)
{
const struct bpf_sec_def *sec_def;
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index f1dacecb1619..abe5786fcab3 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -258,6 +258,17 @@ struct bpf_map;
LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(struct bpf_map *map);
+struct bpf_iter_attach_opts {
+ size_t sz; /* size of this struct for forward/backward compatibility */
+};
+#define bpf_iter_attach_opts__last_field sz
+
+LIBBPF_API struct bpf_link *
+bpf_program__attach_iter(struct bpf_program *prog,
+ const struct bpf_iter_attach_opts *opts);
+LIBBPF_API int
+bpf_link__create_iter(struct bpf_link *link, unsigned int flags);
+
struct bpf_insn;
/*
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index bb8831605b25..1cea36f9f2e2 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -254,3 +254,10 @@ LIBBPF_0.0.8 {
bpf_program__set_lsm;
bpf_set_link_xdp_fd_opts;
} LIBBPF_0.0.7;
+
+LIBBPF_0.0.9 {
+ global:
+ bpf_link__create_iter;
+ bpf_program__attach_iter;
+ bpf_iter_create;
+} LIBBPF_0.0.8;
--
2.24.1
