Re: [PATCH bpf-next v3 3/4] net/smc: add BPF injection on smc negotiation

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Hi Wythe,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/intel-lab-lkp/linux/commits/D-Wythe/net-smc-move-smc_sock-related-structure-definition/20230228-173007
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/1677576294-33411-4-git-send-email-alibuda%40linux.alibaba.com
patch subject: [PATCH bpf-next v3 3/4] net/smc: add BPF injection on smc negotiation
config: x86_64-randconfig-a015-20230227 (https://download.01.org/0day-ci/archive/20230228/202302282100.x7qq7PGX-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/aa482ab82f4bf9b99d490f8ba5d88e1491156ccf
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review D-Wythe/net-smc-move-smc_sock-related-structure-definition/20230228-173007
        git checkout aa482ab82f4bf9b99d490f8ba5d88e1491156ccf
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202302282100.x7qq7PGX-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   ld: net/smc/af_smc.o: in function `smc_hs_congested':
>> net/smc/af_smc.c:169: undefined reference to `smc_sock_should_select_smc'
   ld: net/smc/af_smc.o: in function `smc_release':
>> net/smc/af_smc.c:327: undefined reference to `smc_sock_perform_collecting_info'
   ld: net/smc/af_smc.o: in function `smc_connect':
   net/smc/af_smc.c:1637: undefined reference to `smc_sock_should_select_smc'


vim +169 net/smc/af_smc.c

   156	
   157	static bool smc_hs_congested(const struct sock *sk)
   158	{
   159		const struct smc_sock *smc;
   160	
   161		smc = smc_clcsock_user_data(sk);
   162	
   163		if (!smc)
   164			return true;
   165	
   166		if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq))
   167			return true;
   168	
 > 169		if (!smc_sock_should_select_smc(smc))
   170			return true;
   171	
   172		return false;
   173	}
   174	
   175	static struct smc_hashinfo smc_v4_hashinfo = {
   176		.lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
   177	};
   178	
   179	static struct smc_hashinfo smc_v6_hashinfo = {
   180		.lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
   181	};
   182	
   183	int smc_hash_sk(struct sock *sk)
   184	{
   185		struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
   186		struct hlist_head *head;
   187	
   188		head = &h->ht;
   189	
   190		write_lock_bh(&h->lock);
   191		sk_add_node(sk, head);
   192		write_unlock_bh(&h->lock);
   193		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
   194	
   195		return 0;
   196	}
   197	EXPORT_SYMBOL_GPL(smc_hash_sk);
   198	
   199	void smc_unhash_sk(struct sock *sk)
   200	{
   201		struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
   202	
   203		write_lock_bh(&h->lock);
   204		if (sk_del_node_init(sk))
   205			sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
   206		write_unlock_bh(&h->lock);
   207	}
   208	EXPORT_SYMBOL_GPL(smc_unhash_sk);
   209	
   210	/* This will be called before user really release sock_lock. So do the
   211	 * work which we didn't do because of user hold the sock_lock in the
   212	 * BH context
   213	 */
   214	static void smc_release_cb(struct sock *sk)
   215	{
   216		struct smc_sock *smc = smc_sk(sk);
   217	
   218		if (smc->conn.tx_in_release_sock) {
   219			smc_tx_pending(&smc->conn);
   220			smc->conn.tx_in_release_sock = false;
   221		}
   222	}
   223	
   224	struct proto smc_proto = {
   225		.name		= "SMC",
   226		.owner		= THIS_MODULE,
   227		.keepalive	= smc_set_keepalive,
   228		.hash		= smc_hash_sk,
   229		.unhash		= smc_unhash_sk,
   230		.release_cb	= smc_release_cb,
   231		.obj_size	= sizeof(struct smc_sock),
   232		.h.smc_hash	= &smc_v4_hashinfo,
   233		.slab_flags	= SLAB_TYPESAFE_BY_RCU,
   234	};
   235	EXPORT_SYMBOL_GPL(smc_proto);
   236	
   237	struct proto smc_proto6 = {
   238		.name		= "SMC6",
   239		.owner		= THIS_MODULE,
   240		.keepalive	= smc_set_keepalive,
   241		.hash		= smc_hash_sk,
   242		.unhash		= smc_unhash_sk,
   243		.release_cb	= smc_release_cb,
   244		.obj_size	= sizeof(struct smc_sock),
   245		.h.smc_hash	= &smc_v6_hashinfo,
   246		.slab_flags	= SLAB_TYPESAFE_BY_RCU,
   247	};
   248	EXPORT_SYMBOL_GPL(smc_proto6);
   249	
   250	static void smc_fback_restore_callbacks(struct smc_sock *smc)
   251	{
   252		struct sock *clcsk = smc->clcsock->sk;
   253	
   254		write_lock_bh(&clcsk->sk_callback_lock);
   255		clcsk->sk_user_data = NULL;
   256	
   257		smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change);
   258		smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready);
   259		smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space);
   260		smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report);
   261	
   262		write_unlock_bh(&clcsk->sk_callback_lock);
   263	}
   264	
   265	static void smc_restore_fallback_changes(struct smc_sock *smc)
   266	{
   267		if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
   268			smc->clcsock->file->private_data = smc->sk.sk_socket;
   269			smc->clcsock->file = NULL;
   270			smc_fback_restore_callbacks(smc);
   271		}
   272	}
   273	
   274	static int __smc_release(struct smc_sock *smc)
   275	{
   276		struct sock *sk = &smc->sk;
   277		int rc = 0;
   278	
   279		if (!smc->use_fallback) {
   280			rc = smc_close_active(smc);
   281			sock_set_flag(sk, SOCK_DEAD);
   282			sk->sk_shutdown |= SHUTDOWN_MASK;
   283		} else {
   284			if (sk->sk_state != SMC_CLOSED) {
   285				if (sk->sk_state != SMC_LISTEN &&
   286				    sk->sk_state != SMC_INIT)
   287					sock_put(sk); /* passive closing */
   288				if (sk->sk_state == SMC_LISTEN) {
   289					/* wake up clcsock accept */
   290					rc = kernel_sock_shutdown(smc->clcsock,
   291								  SHUT_RDWR);
   292				}
   293				sk->sk_state = SMC_CLOSED;
   294				sk->sk_state_change(sk);
   295			}
   296			smc_restore_fallback_changes(smc);
   297		}
   298	
   299		sk->sk_prot->unhash(sk);
   300	
   301		if (sk->sk_state == SMC_CLOSED) {
   302			if (smc->clcsock) {
   303				release_sock(sk);
   304				smc_clcsock_release(smc);
   305				lock_sock(sk);
   306			}
   307			if (!smc->use_fallback)
   308				smc_conn_free(&smc->conn);
   309		}
   310	
   311		return rc;
   312	}
   313	
   314	static int smc_release(struct socket *sock)
   315	{
   316		struct sock *sk = sock->sk;
   317		struct smc_sock *smc;
   318		int old_state, rc = 0;
   319	
   320		if (!sk)
   321			goto out;
   322	
   323		sock_hold(sk); /* sock_put below */
   324		smc = smc_sk(sk);
   325	
   326		/* trigger info gathering if needed.*/
 > 327		smc_sock_perform_collecting_info(sk, SMC_SOCK_CLOSED_TIMING);
   328	
   329		old_state = sk->sk_state;
   330	
   331		/* cleanup for a dangling non-blocking connect */
   332		if (smc->connect_nonblock && old_state == SMC_INIT)
   333			tcp_abort(smc->clcsock->sk, ECONNABORTED);
   334	
   335		if (cancel_work_sync(&smc->connect_work))
   336			sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
   337	
   338		if (sk->sk_state == SMC_LISTEN)
   339			/* smc_close_non_accepted() is called and acquires
   340			 * sock lock for child sockets again
   341			 */
   342			lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
   343		else
   344			lock_sock(sk);
   345	
   346		if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
   347		    !smc->use_fallback)
   348			smc_close_active_abort(smc);
   349	
   350		rc = __smc_release(smc);
   351	
   352		/* detach socket */
   353		sock_orphan(sk);
   354		sock->sk = NULL;
   355		release_sock(sk);
   356	
   357		sock_put(sk); /* sock_hold above */
   358		sock_put(sk); /* final sock_put */
   359	out:
   360		return rc;
   361	}
   362	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests



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