Commit 2ab3d86e authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov

libbpf: Add libbpf support to batch ops

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: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200115184308.162644-8-brianvv@google.com
parent a1e3a3b8
......@@ -452,6 +452,64 @@ 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,
const struct bpf_map_batch_opts *opts)
{
union bpf_attr attr = {};
int ret;
if (!OPTS_VALID(opts, bpf_map_batch_opts))
return -EINVAL;
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);
attr.batch.count = *count;
attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0);
attr.batch.flags = OPTS_GET(opts, flags, 0);
ret = sys_bpf(cmd, &attr, sizeof(attr));
*count = attr.batch.count;
return ret;
}
int bpf_map_delete_batch(int fd, void *keys, __u32 *count,
const struct bpf_map_batch_opts *opts)
{
return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL,
NULL, keys, NULL, count, opts);
}
int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
void *values, __u32 *count,
const struct bpf_map_batch_opts *opts)
{
return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch,
out_batch, keys, values, count, opts);
}
int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
void *keys, void *values, __u32 *count,
const struct bpf_map_batch_opts *opts)
{
return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH,
fd, in_batch, out_batch, keys, values,
count, opts);
}
int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count,
const struct bpf_map_batch_opts *opts)
{
return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL,
keys, values, count, opts);
}
int bpf_obj_pin(int fd, const char *pathname)
{
union bpf_attr attr;
......
......@@ -127,6 +127,28 @@ 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);
struct bpf_map_batch_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u64 elem_flags;
__u64 flags;
};
#define bpf_map_batch_opts__last_field flags
LIBBPF_API int bpf_map_delete_batch(int fd, void *keys,
__u32 *count,
const struct bpf_map_batch_opts *opts);
LIBBPF_API int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch,
void *keys, void *values, __u32 *count,
const struct bpf_map_batch_opts *opts);
LIBBPF_API int bpf_map_lookup_and_delete_batch(int fd, void *in_batch,
void *out_batch, void *keys,
void *values, __u32 *count,
const struct bpf_map_batch_opts *opts);
LIBBPF_API int bpf_map_update_batch(int fd, void *keys, void *values,
__u32 *count,
const struct bpf_map_batch_opts *opts);
LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
LIBBPF_API int bpf_obj_get(const char *pathname);
......
......@@ -214,6 +214,10 @@ LIBBPF_0.0.7 {
btf_dump__emit_type_decl;
bpf_link__disconnect;
bpf_map__attach_struct_ops;
bpf_map_delete_batch;
bpf_map_lookup_and_delete_batch;
bpf_map_lookup_batch;
bpf_map_update_batch;
bpf_object__find_program_by_name;
bpf_object__attach_skeleton;
bpf_object__destroy_skeleton;
......
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