[PATCH bpf-next 1/5] bpf: add new BPF_BTF_GET_NEXT_ID syscall command

[Quentin Monnet]

Add a new command for the bpf() system call: BPF_BTF_GET_NEXT_ID is used
to cycle through all BTF objects loaded on the system.

The motivation is to be able to inspect (list) all BTF objects presents
on the system.

Signed-off-by: Quentin Monnet <quentin.mon...@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 include/linux/bpf.h      | 3 +++
 include/uapi/linux/bpf.h | 1 +
 kernel/bpf/btf.c         | 4 ++--
 kernel/bpf/syscall.c     | 4 ++++
 4 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index f9a506147c8a..279ea762c34e 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -24,6 +24,9 @@ struct seq_file;
 struct btf;
 struct btf_type;
 
+extern struct idr btf_idr;
+extern spinlock_t btf_idr_lock;
+
 /* map is generic key/value storage optionally accesible by eBPF programs */
 struct bpf_map_ops {
        /* funcs callable from userspace (via syscall) */
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 4393bd4b2419..874bc5eefee1 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -106,6 +106,7 @@ enum bpf_cmd {
        BPF_TASK_FD_QUERY,
        BPF_MAP_LOOKUP_AND_DELETE_ELEM,
        BPF_MAP_FREEZE,
+       BPF_BTF_GET_NEXT_ID,
 };
 
 enum bpf_map_type {
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 5fcc7a17eb5a..e716a64b2f7f 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -195,8 +195,8 @@
             i < btf_type_vlen(struct_type);                                    
\
             i++, member++)
 
-static DEFINE_IDR(btf_idr);
-static DEFINE_SPINLOCK(btf_idr_lock);
+DEFINE_IDR(btf_idr);
+DEFINE_SPINLOCK(btf_idr_lock);
 
 struct btf {
        void *data;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 5d141f16f6fa..407b7f840874 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2874,6 +2874,10 @@ SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, 
uattr, unsigned int, siz
                err = bpf_obj_get_next_id(&attr, uattr,
                                          &map_idr, &map_idr_lock);
                break;
+       case BPF_BTF_GET_NEXT_ID:
+               err = bpf_obj_get_next_id(&attr, uattr,
+                                         &btf_idr, &btf_idr_lock);
+               break;
        case BPF_PROG_GET_FD_BY_ID:
                err = bpf_prog_get_fd_by_id(&attr);
                break;
-- 
2.17.1