Re: [PATCH bpf-next v2 1/6] bpf: Add bpf_link support for sk_msg and sk_skb progs

[kernel test robot <lkp@intel.com>]

Hi Yonghong,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Yonghong-Song/bpf-Add-bpf_link-support-for-sk_msg-and-sk_skb-progs/20240320-015917
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20240319175406.2940628-1-yonghong.song%40linux.dev
patch subject: [PATCH bpf-next v2 1/6] bpf: Add bpf_link support for sk_msg and sk_skb progs
config: nios2-randconfig-001-20240321 (https://download.01.org/0day-ci/archive/20240322/202403220545.KEzjr9hI-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240322/202403220545.KEzjr9hI-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403220545.KEzjr9hI-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   net/core/skmsg.c: In function 'bpf_sk_msg_skb_link_release':
>> net/core/skmsg.c:1279:23: error: implicit declaration of function 'sock_map_prog_update' [-Werror=implicit-function-declaration]
    1279 |                 (void)sock_map_prog_update(sk_link->map, NULL, link->prog,
         |                       ^~~~~~~~~~~~~~~~~~~~
>> net/core/skmsg.c:1281:17: error: implicit declaration of function 'bpf_map_put_with_uref' [-Werror=implicit-function-declaration]
    1281 |                 bpf_map_put_with_uref(sk_link->map);
         |                 ^~~~~~~~~~~~~~~~~~~~~
   net/core/skmsg.c: At top level:
>> net/core/skmsg.c:1371:5: warning: no previous prototype for 'bpf_sk_msg_skb_link_create' [-Wmissing-prototypes]
    1371 | int bpf_sk_msg_skb_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   net/core/skmsg.c: In function 'bpf_sk_msg_skb_link_create':
>> net/core/skmsg.c:1383:15: error: implicit declaration of function 'bpf_map_get_with_uref' [-Werror=implicit-function-declaration]
    1383 |         map = bpf_map_get_with_uref(attr->link_create.target_fd);
         |               ^~~~~~~~~~~~~~~~~~~~~
>> net/core/skmsg.c:1383:13: warning: assignment to 'struct bpf_map *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1383 |         map = bpf_map_get_with_uref(attr->link_create.target_fd);
         |             ^
   cc1: some warnings being treated as errors


vim +/sock_map_prog_update +1279 net/core/skmsg.c

  1272	
  1273	static void bpf_sk_msg_skb_link_release(struct bpf_link *link)
  1274	{
  1275		struct bpf_sk_msg_skb_link *sk_link = bpf_sk_msg_skb_link(link);
  1276	
  1277		mutex_lock(&link_mutex);
  1278		if (sk_link->map) {
> 1279			(void)sock_map_prog_update(sk_link->map, NULL, link->prog,
  1280						   sk_link->attach_type);
> 1281			bpf_map_put_with_uref(sk_link->map);
  1282			sk_link->map = NULL;
  1283		}
  1284		mutex_unlock(&link_mutex);
  1285	}
  1286	
  1287	static int bpf_sk_msg_skb_link_detach(struct bpf_link *link)
  1288	{
  1289		bpf_sk_msg_skb_link_release(link);
  1290		return 0;
  1291	}
  1292	
  1293	static void bpf_sk_msg_skb_link_dealloc(struct bpf_link *link)
  1294	{
  1295		kfree(bpf_sk_msg_skb_link(link));
  1296	}
  1297	
  1298	static int bpf_sk_msg_skb_link_update_prog(struct bpf_link *link,
  1299						   struct bpf_prog *new_prog,
  1300						   struct bpf_prog *old_prog)
  1301	{
  1302		const struct bpf_sk_msg_skb_link *sk_link = bpf_sk_msg_skb_link(link);
  1303		int ret = 0;
  1304	
  1305		mutex_lock(&link_mutex);
  1306		if (old_prog && link->prog != old_prog) {
  1307			ret = -EPERM;
  1308			goto out;
  1309		}
  1310	
  1311		if (link->prog->type != new_prog->type) {
  1312			ret = -EINVAL;
  1313			goto out;
  1314		}
  1315	
  1316		ret = sock_map_prog_update(sk_link->map, new_prog, old_prog,
  1317					   sk_link->attach_type);
  1318		if (!ret)
  1319			bpf_prog_inc(new_prog);
  1320	
  1321	out:
  1322		mutex_unlock(&link_mutex);
  1323		return ret;
  1324	}
  1325	
  1326	static int bpf_sk_msg_skb_link_fill_info(const struct bpf_link *link,
  1327						 struct bpf_link_info *info)
  1328	{
  1329		const struct bpf_sk_msg_skb_link *sk_link = bpf_sk_msg_skb_link(link);
  1330		u32 map_id = 0;
  1331	
  1332		mutex_lock(&link_mutex);
  1333		if (sk_link->map)
  1334			map_id = sk_link->map->id;
  1335		mutex_unlock(&link_mutex);
  1336	
  1337		if (link->type == BPF_LINK_TYPE_SK_MSG) {
  1338			info->skmsg.map_id = map_id;
  1339			info->skmsg.attach_type = sk_link->attach_type;
  1340		} else {
  1341			info->skskb.map_id = map_id;
  1342			info->skskb.attach_type = sk_link->attach_type;
  1343		}
  1344		return 0;
  1345	}
  1346	
  1347	static void bpf_sk_msg_skb_link_show_fdinfo(const struct bpf_link *link,
  1348						    struct seq_file *seq)
  1349	{
  1350		const struct bpf_sk_msg_skb_link *sk_link = bpf_sk_msg_skb_link(link);
  1351		u32 map_id = 0;
  1352	
  1353		mutex_lock(&link_mutex);
  1354		if (sk_link->map)
  1355			map_id = sk_link->map->id;
  1356		mutex_unlock(&link_mutex);
  1357	
  1358		seq_printf(seq, "map_id:\t%u\n", map_id);
  1359		seq_printf(seq, "attach_type:\t%u (...)\n", sk_link->attach_type);
  1360	}
  1361	
  1362	static const struct bpf_link_ops bpf_sk_msg_skb_link_ops = {
  1363		.release = bpf_sk_msg_skb_link_release,
  1364		.dealloc = bpf_sk_msg_skb_link_dealloc,
  1365		.detach = bpf_sk_msg_skb_link_detach,
  1366		.update_prog = bpf_sk_msg_skb_link_update_prog,
  1367		.fill_link_info = bpf_sk_msg_skb_link_fill_info,
  1368		.show_fdinfo = bpf_sk_msg_skb_link_show_fdinfo,
  1369	};
  1370	
> 1371	int bpf_sk_msg_skb_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
  1372	{
  1373		struct bpf_link_primer link_primer;
  1374		struct bpf_sk_msg_skb_link *sk_link;
  1375		enum bpf_attach_type attach_type;
  1376		enum bpf_link_type link_type;
  1377		struct bpf_map *map;
  1378		int ret;
  1379	
  1380		if (attr->link_create.flags)
  1381			return -EINVAL;
  1382	
> 1383		map = bpf_map_get_with_uref(attr->link_create.target_fd);

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