bpf: Remove attach_type in sockmap_link

Use attach_type in bpf_link, and remove it in sockmap_link.

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

Author: Tao Chen

net/core/sock_map.c

@@ -1709,7 +1709,6 @@ EXPORT_SYMBOL_GPL(sock_map_close);
 struct sockmap_link {
 	struct bpf_link link;
 	struct bpf_map *map;
-	enum bpf_attach_type attach_type;
 };
 
 static void sock_map_link_release(struct bpf_link *link)
@@ -1721,7 +1720,7 @@ static void sock_map_link_release(struct bpf_link *link)
 		goto out;
 
 	WARN_ON_ONCE(sock_map_prog_update(sockmap_link->map, NULL, link->prog, link,
-					  sockmap_link->attach_type));
+					  link->attach_type));
 
 	bpf_map_put_with_uref(sockmap_link->map);
 	sockmap_link->map = NULL;
@@ -1772,7 +1771,7 @@ static int sock_map_link_update_prog(struct bpf_link *link,
 	}
 
 	ret = sock_map_prog_link_lookup(sockmap_link->map, &pprog, &plink,
-					sockmap_link->attach_type);
+					link->attach_type);
 	if (ret)
 		goto out;
 
@@ -1817,7 +1816,7 @@ static int sock_map_link_fill_info(const struct bpf_link *link,
 	u32 map_id = sock_map_link_get_map_id(sockmap_link);
 
 	info->sockmap.map_id = map_id;
-	info->sockmap.attach_type = sockmap_link->attach_type;
+	info->sockmap.attach_type = link->attach_type;
 	return 0;
 }
 
@@ -1828,7 +1827,7 @@ static void sock_map_link_show_fdinfo(const struct bpf_link *link,
 	u32 map_id = sock_map_link_get_map_id(sockmap_link);
 
 	seq_printf(seq, "map_id:\t%u\n", map_id);
-	seq_printf(seq, "attach_type:\t%u\n", sockmap_link->attach_type);
+	seq_printf(seq, "attach_type:\t%u\n", link->attach_type);
 }
 
 static const struct bpf_link_ops sock_map_link_ops = {
@@ -1869,7 +1868,6 @@ int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
 	bpf_link_init(&sockmap_link->link, BPF_LINK_TYPE_SOCKMAP, &sock_map_link_ops, prog,
 		      attach_type);
 	sockmap_link->map = map;
-	sockmap_link->attach_type = attach_type;
 
 	ret = bpf_link_prime(&sockmap_link->link, &link_primer);
 	if (ret) {