Commit 59d3656d authored by Brenden Blanco's avatar Brenden Blanco Committed by David S. Miller

bpf: add bpf_prog_add api for bulk prog refcnt

A subsystem may need to store many copies of a bpf program, each
deserving its own reference. Rather than requiring the caller to loop
one by one (with possible mid-loop failure), add a bulk bpf_prog_add
Signed-off-by: default avatarBrenden Blanco <>
Acked-by: default avatarAlexei Starovoitov <>
Signed-off-by: default avatarDavid S. Miller <>
parent ddbcb794
......@@ -224,6 +224,7 @@ void bpf_register_map_type(struct bpf_map_type_list *tl);
struct bpf_prog *bpf_prog_get(u32 ufd);
struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type);
struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i);
struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog);
void bpf_prog_put(struct bpf_prog *prog);
......@@ -670,14 +670,20 @@ static struct bpf_prog *____bpf_prog_get(struct fd f)
return f.file->private_data;
struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i)
if (atomic_inc_return(&prog->aux->refcnt) > BPF_MAX_REFCNT) {
if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) {
atomic_sub(i, &prog->aux->refcnt);
return ERR_PTR(-EBUSY);
return prog;
struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
return bpf_prog_add(prog, 1);
static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *type)
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