Re: [PATCH RFC bpf-next 6/7] libbpf: add bpf_link based TC-BPF management API

This adds userspace TC-BPF management API based on bpf_link.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 tools/lib/bpf/bpf.c      |  5 ++++
 tools/lib/bpf/bpf.h      |  8 +++++-
 tools/lib/bpf/libbpf.c   | 59 ++++++++++++++++++++++++++++++++++++++--
 tools/lib/bpf/libbpf.h   | 17 ++++++++++++
 tools/lib/bpf/libbpf.map |  1 +
 tools/lib/bpf/netlink.c  |  5 ++--
 tools/lib/bpf/netlink.h  |  8 ++++++
 7 files changed, 98 insertions(+), 5 deletions(-)
 create mode 100644 tools/lib/bpf/netlink.h

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 86dcac44f32f..ab2e2e9ccc5e 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c

@@ -28,6 +28,7 @@
 #include <asm/unistd.h>
 #include <errno.h>
 #include <linux/bpf.h>
+#include <arpa/inet.h>
 #include "bpf.h"
 #include "libbpf.h"
 #include "libbpf_internal.h"

@@ -692,6 +693,10 @@ int bpf_link_create(int prog_fd, int target_fd,
        attr.link_create.target_fd = target_fd;
        attr.link_create.attach_type = attach_type;
        attr.link_create.flags = OPTS_GET(opts, flags, 0);
+       attr.link_create.tc.parent = OPTS_GET(opts, tc.parent, 0);
+       attr.link_create.tc.handle = OPTS_GET(opts, tc.handle, 0);
+       attr.link_create.tc.priority = OPTS_GET(opts, tc.priority, 0);
+       attr.link_create.tc.gen_flags = OPTS_GET(opts, tc.gen_flags, 0);