netkit: Remove location field in netkit_link

Use attach_type in bpf_link to replace the location field, and
remove location field in netkit_link.

Signed-off-by: Tao Chen <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Acked-by: Nikolay Aleksandrov <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: Tao Chen

drivers/net/netkit.c

@@ -32,7 +32,6 @@ struct netkit {
 struct netkit_link {
 	struct bpf_link link;
 	struct net_device *dev;
-	u32 location;
 };
 
 static __always_inline int
@@ -733,8 +732,8 @@ static void netkit_link_fdinfo(const struct bpf_link *link, struct seq_file *seq
 
 	seq_printf(seq, "ifindex:\t%u\n", ifindex);
 	seq_printf(seq, "attach_type:\t%u (%s)\n",
-		   nkl->location,
-		   nkl->location == BPF_NETKIT_PRIMARY ? "primary" : "peer");
+		   link->attach_type,
+		   link->attach_type == BPF_NETKIT_PRIMARY ? "primary" : "peer");
 }
 
 static int netkit_link_fill_info(const struct bpf_link *link,
@@ -749,7 +748,7 @@ static int netkit_link_fill_info(const struct bpf_link *link,
 	rtnl_unlock();
 
 	info->netkit.ifindex = ifindex;
-	info->netkit.attach_type = nkl->location;
+	info->netkit.attach_type = link->attach_type;
 	return 0;
 }
 
@@ -776,7 +775,6 @@ static int netkit_link_init(struct netkit_link *nkl,
 {
 	bpf_link_init(&nkl->link, BPF_LINK_TYPE_NETKIT,
 		      &netkit_link_lops, prog, attr->link_create.attach_type);
-	nkl->location = attr->link_create.attach_type;
 	nkl->dev = dev;
 	return bpf_link_prime(&nkl->link, link_primer);
 }