[PATCH bpf-next 7/9] libbpf: add libbpf support to batch ops

[Brian Vazquez <brianvv@google.com>]

From: Yonghong Song <yhs@fb.com>

Added four libbpf API functions to support map batch operations:
  . int bpf_map_delete_batch( ... )
  . int bpf_map_lookup_batch( ... )
  . int bpf_map_lookup_and_delete_batch( ... )
  . int bpf_map_update_batch( ... )

Signed-off-by: Yonghong Song <yhs@fb.com>
---
 tools/lib/bpf/bpf.c      | 61 ++++++++++++++++++++++++++++++++++++++++
 tools/lib/bpf/bpf.h      | 14 +++++++++
 tools/lib/bpf/libbpf.map |  4 +++
 3 files changed, 79 insertions(+)

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 98596e15390fb..9acd9309b47b3 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -443,6 +443,67 @@ int bpf_map_freeze(int fd)
 	return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));
 }
 
+static int bpf_map_batch_common(int cmd, int fd, void  *in_batch,
+				void *out_batch, void *keys, void *values,
+				__u32 *count, __u64 elem_flags,
+				__u64 flags)
+{
+	union bpf_attr attr = {};
+	int ret;
+
+	memset(&attr, 0, sizeof(attr));
+	attr.batch.map_fd = fd;
+	attr.batch.in_batch = ptr_to_u64(in_batch);
+	attr.batch.out_batch = ptr_to_u64(out_batch);
+	attr.batch.keys = ptr_to_u64(keys);
+	attr.batch.values = ptr_to_u64(values);
+	if (count)
+		attr.batch.count = *count;
+	attr.batch.elem_flags = elem_flags;
+	attr.batch.flags = flags;
+
+	ret = sys_bpf(cmd, &attr, sizeof(attr));
+	if (count)
+		*count = attr.batch.count;
+
+	return ret;
+}
+
+int bpf_map_delete_batch(int fd, void *in_batch, void *out_batch, __u32 *count,
+			 __u64 elem_flags, __u64 flags)
+{
+	return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, in_batch,
+				    out_batch, NULL, NULL, count,
+				    elem_flags, flags);
+}
+
+int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
+			 void *values, __u32 *count,
+			 __u64 elem_flags, __u64 flags)
+{
+	return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch,
+				    out_batch, keys, values, count,
+				    elem_flags, flags);
+}
+
+int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
+				    void *keys, void *values,
+				    __u32 *count, __u64 elem_flags,
+				    __u64 flags)
+{
+	return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH,
+				    fd, in_batch, out_batch, keys, values,
+				    count, elem_flags, flags);
+}
+
+int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count,
+			 __u64 elem_flags, __u64 flags)
+{
+	return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH,
+				    fd, NULL, NULL, keys, values,
+				    count, elem_flags, flags);
+}
+
 int bpf_obj_pin(int fd, const char *pathname)
 {
 	union bpf_attr attr;
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 3c791fa8e68e8..3ec63384400f1 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -126,6 +126,20 @@ LIBBPF_API int bpf_map_lookup_and_delete_elem(int fd, const void *key,
 LIBBPF_API int bpf_map_delete_elem(int fd, const void *key);
 LIBBPF_API int bpf_map_get_next_key(int fd, const void *key, void *next_key);
 LIBBPF_API int bpf_map_freeze(int fd);
+LIBBPF_API int bpf_map_delete_batch(int fd, void *in_batch, void *out_batch,
+				    __u32 *count, __u64 elem_flags,
+				    __u64 flags);
+LIBBPF_API int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch,
+				    void *keys, void *values, __u32 *count,
+				    __u64 elem_flags, __u64 flags);
+LIBBPF_API int bpf_map_lookup_and_delete_batch(int fd, void *in_batch,
+					       void *out_batch, void *keys,
+					       void *values, __u32 *count,
+					       __u64 elem_flags, __u64 flags);
+LIBBPF_API int bpf_map_update_batch(int fd, void *keys, void *values,
+				    __u32 *count, __u64 elem_flags,
+				    __u64 flags);
+
 LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
 LIBBPF_API int bpf_obj_get(const char *pathname);
 LIBBPF_API int bpf_prog_attach(int prog_fd, int attachable_fd,
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 8ddc2c40e482d..56462fea66f74 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -207,4 +207,8 @@ LIBBPF_0.0.6 {
 		bpf_program__size;
 		btf__find_by_name_kind;
 		libbpf_find_vmlinux_btf_id;
+		bpf_map_delete_batch;
+		bpf_map_lookup_and_delete_batch;
+		bpf_map_lookup_batch;
+		bpf_map_update_batch;
 } LIBBPF_0.0.5;
-- 
2.24.0.432.g9d3f5f5b63-goog