[mirror_ubuntu-jammy-kernel.git] / net / smc / smc_close.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 *  Socket Closing - normal and abnormal
 *
 *  Copyright IBM Corp. 2016
 *
 *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
 */

#include <linux/workqueue.h>
#include <linux/sched/signal.h>

#include <net/sock.h>

#include "smc.h"
#include "smc_tx.h"
#include "smc_cdc.h"
#include "smc_close.h"

#define SMC_CLOSE_WAIT_LISTEN_CLCSOCK_TIME	(5 * HZ)

/* release the clcsock that is assigned to the smc_sock */
void smc_clcsock_release(struct smc_sock *smc)
{
	struct socket *tcp;

	if (smc->listen_smc && current_work() != &smc->smc_listen_work)
		cancel_work_sync(&smc->smc_listen_work);
	mutex_lock(&smc->clcsock_release_lock);
	if (smc->clcsock) {
		tcp = smc->clcsock;
		smc->clcsock = NULL;
		sock_release(tcp);
	}
	mutex_unlock(&smc->clcsock_release_lock);
}

static void smc_close_cleanup_listen(struct sock *parent)
{
	struct sock *sk;

	/* Close non-accepted connections */
	while ((sk = smc_accept_dequeue(parent, NULL)))
		smc_close_non_accepted(sk);
}

/* wait for sndbuf data being transmitted */
static void smc_close_stream_wait(struct smc_sock *smc, long timeout)
{
	DEFINE_WAIT_FUNC(wait, woken_wake_function);
	struct sock *sk = &smc->sk;

	if (!timeout)
		return;

	if (!smc_tx_prepared_sends(&smc->conn))
		return;

	smc->wait_close_tx_prepared = 1;
	add_wait_queue(sk_sleep(sk), &wait);
	while (!signal_pending(current) && timeout) {
		int rc;

		rc = sk_wait_event(sk, &timeout,
				   !smc_tx_prepared_sends(&smc->conn) ||
				   sk->sk_err == ECONNABORTED ||
				   sk->sk_err == ECONNRESET ||
				   smc->conn.killed,
				   &wait);
		if (rc)
			break;
	}
	remove_wait_queue(sk_sleep(sk), &wait);
	smc->wait_close_tx_prepared = 0;
}

void smc_close_wake_tx_prepared(struct smc_sock *smc)
{
	if (smc->wait_close_tx_prepared)
		/* wake up socket closing */
		smc->sk.sk_state_change(&smc->sk);
}

static int smc_close_wr(struct smc_connection *conn)
{
	conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1;

	return smc_cdc_get_slot_and_msg_send(conn);
}

static int smc_close_final(struct smc_connection *conn)
{
	if (atomic_read(&conn->bytes_to_rcv))
		conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
	else
		conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1;
	if (conn->killed)
		return -EPIPE;

	return smc_cdc_get_slot_and_msg_send(conn);
}

static int smc_close_abort(struct smc_connection *conn)
{
	conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;

	return smc_cdc_get_slot_and_msg_send(conn);
}

/* terminate smc socket abnormally - active abort
 * link group is terminated, i.e. RDMA communication no longer possible
 */
static void smc_close_active_abort(struct smc_sock *smc)
{
	struct sock *sk = &smc->sk;

	if (sk->sk_state != SMC_INIT && smc->clcsock && smc->clcsock->sk) {
		sk->sk_err = ECONNABORTED;
		if (smc->clcsock && smc->clcsock->sk) {
			smc->clcsock->sk->sk_err = ECONNABORTED;
			smc->clcsock->sk->sk_state_change(smc->clcsock->sk);
		}
	}
	switch (sk->sk_state) {
	case SMC_ACTIVE:
		sk->sk_state = SMC_PEERABORTWAIT;
		release_sock(sk);
		cancel_delayed_work_sync(&smc->conn.tx_work);
		lock_sock(sk);
		sk->sk_state = SMC_CLOSED;
		sock_put(sk); /* passive closing */
		break;
	case SMC_APPCLOSEWAIT1:
	case SMC_APPCLOSEWAIT2:
		release_sock(sk);
		cancel_delayed_work_sync(&smc->conn.tx_work);
		lock_sock(sk);
		sk->sk_state = SMC_CLOSED;
		break;
	case SMC_PEERCLOSEWAIT1:
	case SMC_PEERCLOSEWAIT2:
	case SMC_PEERFINCLOSEWAIT:
		sk->sk_state = SMC_CLOSED;
		sock_put(sk); /* passive closing */
		break;
	case SMC_PROCESSABORT:
	case SMC_APPFINCLOSEWAIT:
		sk->sk_state = SMC_CLOSED;
		break;
	case SMC_INIT:
	case SMC_PEERABORTWAIT:
	case SMC_CLOSED:
		break;
	}

	sock_set_flag(sk, SOCK_DEAD);
	sk->sk_state_change(sk);
}

static inline bool smc_close_sent_any_close(struct smc_connection *conn)
{
	return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort ||
	       conn->local_tx_ctrl.conn_state_flags.peer_conn_closed;
}

int smc_close_active(struct smc_sock *smc)
{
	struct smc_cdc_conn_state_flags *txflags =
		&smc->conn.local_tx_ctrl.conn_state_flags;
	struct smc_connection *conn = &smc->conn;
	struct sock *sk = &smc->sk;
	int old_state;
	long timeout;
	int rc = 0;

	timeout = current->flags & PF_EXITING ?
		  0 : sock_flag(sk, SOCK_LINGER) ?
		      sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;

	old_state = sk->sk_state;
again:
	switch (sk->sk_state) {
	case SMC_INIT:
		sk->sk_state = SMC_CLOSED;
		break;
	case SMC_LISTEN:
		sk->sk_state = SMC_CLOSED;
		sk->sk_state_change(sk); /* wake up accept */
		if (smc->clcsock && smc->clcsock->sk) {
			rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
			/* wake up kernel_accept of smc_tcp_listen_worker */
			smc->clcsock->sk->sk_data_ready(smc->clcsock->sk);
		}
		smc_close_cleanup_listen(sk);
		release_sock(sk);
		flush_work(&smc->tcp_listen_work);
		lock_sock(sk);
		break;
	case SMC_ACTIVE:
		smc_close_stream_wait(smc, timeout);
		release_sock(sk);
		cancel_delayed_work_sync(&conn->tx_work);
		lock_sock(sk);
		if (sk->sk_state == SMC_ACTIVE) {
			/* send close request */
			rc = smc_close_final(conn);
			sk->sk_state = SMC_PEERCLOSEWAIT1;
		} else {
			/* peer event has changed the state */
			goto again;
		}
		break;
	case SMC_APPFINCLOSEWAIT:
		/* socket already shutdown wr or both (active close) */
		if (txflags->peer_done_writing &&
		    !smc_close_sent_any_close(conn)) {
			/* just shutdown wr done, send close request */
			rc = smc_close_final(conn);
		}
		sk->sk_state = SMC_CLOSED;
		break;
	case SMC_APPCLOSEWAIT1:
	case SMC_APPCLOSEWAIT2:
		if (!smc_cdc_rxed_any_close(conn))
			smc_close_stream_wait(smc, timeout);
		release_sock(sk);
		cancel_delayed_work_sync(&conn->tx_work);
		lock_sock(sk);
		if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
		    sk->sk_state != SMC_APPCLOSEWAIT2)
			goto again;
		/* confirm close from peer */
		rc = smc_close_final(conn);
		if (smc_cdc_rxed_any_close(conn)) {
			/* peer has closed the socket already */
			sk->sk_state = SMC_CLOSED;
			sock_put(sk); /* postponed passive closing */
		} else {
			/* peer has just issued a shutdown write */
			sk->sk_state = SMC_PEERFINCLOSEWAIT;
		}
		break;
	case SMC_PEERCLOSEWAIT1:
	case SMC_PEERCLOSEWAIT2:
		if (txflags->peer_done_writing &&
		    !smc_close_sent_any_close(conn)) {
			/* just shutdown wr done, send close request */
			rc = smc_close_final(conn);
		}
		/* peer sending PeerConnectionClosed will cause transition */
		break;
	case SMC_PEERFINCLOSEWAIT:
		/* peer sending PeerConnectionClosed will cause transition */
		break;
	case SMC_PROCESSABORT:
		rc = smc_close_abort(conn);
		sk->sk_state = SMC_CLOSED;
		break;
	case SMC_PEERABORTWAIT:
		sk->sk_state = SMC_CLOSED;
		break;
	case SMC_CLOSED:
		/* nothing to do, add tracing in future patch */
		break;
	}

	if (old_state != sk->sk_state)
		sk->sk_state_change(sk);
	return rc;
}

static void smc_close_passive_abort_received(struct smc_sock *smc)
{
	struct smc_cdc_conn_state_flags *txflags =
		&smc->conn.local_tx_ctrl.conn_state_flags;
	struct sock *sk = &smc->sk;

	switch (sk->sk_state) {
	case SMC_INIT:
	case SMC_ACTIVE:
	case SMC_APPCLOSEWAIT1:
		sk->sk_state = SMC_PROCESSABORT;
		sock_put(sk); /* passive closing */
		break;
	case SMC_APPFINCLOSEWAIT:
		sk->sk_state = SMC_PROCESSABORT;
		break;
	case SMC_PEERCLOSEWAIT1:
	case SMC_PEERCLOSEWAIT2:
		if (txflags->peer_done_writing &&
		    !smc_close_sent_any_close(&smc->conn))
			/* just shutdown, but not yet closed locally */
			sk->sk_state = SMC_PROCESSABORT;
		else
			sk->sk_state = SMC_CLOSED;
		sock_put(sk); /* passive closing */
		break;
	case SMC_APPCLOSEWAIT2:
	case SMC_PEERFINCLOSEWAIT:
		sk->sk_state = SMC_CLOSED;
		sock_put(sk); /* passive closing */
		break;
	case SMC_PEERABORTWAIT:
		sk->sk_state = SMC_CLOSED;
		break;
	case SMC_PROCESSABORT:
	/* nothing to do, add tracing in future patch */
		break;
	}
}

/* Either some kind of closing has been received: peer_conn_closed,
 * peer_conn_abort, or peer_done_writing
 * or the link group of the connection terminates abnormally.
 */
static void smc_close_passive_work(struct work_struct *work)
{
	struct smc_connection *conn = container_of(work,
						   struct smc_connection,
						   close_work);
	struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
	struct smc_cdc_conn_state_flags *rxflags;
	bool release_clcsock = false;
	struct sock *sk = &smc->sk;
	int old_state;

	lock_sock(sk);
	old_state = sk->sk_state;

	if (conn->killed) {
		/* abnormal termination */
		smc_close_active_abort(smc);
		goto wakeup;
	}

	rxflags = &conn->local_rx_ctrl.conn_state_flags;
	if (rxflags->peer_conn_abort) {
		/* peer has not received all data */
		smc_close_passive_abort_received(smc);
		release_sock(&smc->sk);
		cancel_delayed_work_sync(&conn->tx_work);
		lock_sock(&smc->sk);
		goto wakeup;
	}

	switch (sk->sk_state) {
	case SMC_INIT:
		sk->sk_state = SMC_APPCLOSEWAIT1;
		break;
	case SMC_ACTIVE:
		sk->sk_state = SMC_APPCLOSEWAIT1;
		/* postpone sock_put() for passive closing to cover
		 * received SEND_SHUTDOWN as well
		 */
		break;
	case SMC_PEERCLOSEWAIT1:
		if (rxflags->peer_done_writing)
			sk->sk_state = SMC_PEERCLOSEWAIT2;
		/* fall through */
		/* to check for closing */
	case SMC_PEERCLOSEWAIT2:
		if (!smc_cdc_rxed_any_close(conn))
			break;
		if (sock_flag(sk, SOCK_DEAD) &&
		    smc_close_sent_any_close(conn)) {
			/* smc_release has already been called locally */
			sk->sk_state = SMC_CLOSED;
		} else {
			/* just shutdown, but not yet closed locally */
			sk->sk_state = SMC_APPFINCLOSEWAIT;
		}
		sock_put(sk); /* passive closing */
		break;
	case SMC_PEERFINCLOSEWAIT:
		if (smc_cdc_rxed_any_close(conn)) {
			sk->sk_state = SMC_CLOSED;
			sock_put(sk); /* passive closing */
		}
		break;
	case SMC_APPCLOSEWAIT1:
	case SMC_APPCLOSEWAIT2:
		/* postpone sock_put() for passive closing to cover
		 * received SEND_SHUTDOWN as well
		 */
		break;
	case SMC_APPFINCLOSEWAIT:
	case SMC_PEERABORTWAIT:
	case SMC_PROCESSABORT:
	case SMC_CLOSED:
		/* nothing to do, add tracing in future patch */
		break;
	}

wakeup:
	sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
	sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */

	if (old_state != sk->sk_state) {
		sk->sk_state_change(sk);
		if ((sk->sk_state == SMC_CLOSED) &&
		    (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) {
			smc_conn_free(conn);
			if (smc->clcsock)
				release_clcsock = true;
		}
	}
	release_sock(sk);
	if (release_clcsock)
		smc_clcsock_release(smc);
	sock_put(sk); /* sock_hold done by schedulers of close_work */
}

int smc_close_shutdown_write(struct smc_sock *smc)
{
	struct smc_connection *conn = &smc->conn;
	struct sock *sk = &smc->sk;
	int old_state;
	long timeout;
	int rc = 0;

	timeout = current->flags & PF_EXITING ?
		  0 : sock_flag(sk, SOCK_LINGER) ?
		      sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;

	old_state = sk->sk_state;
again:
	switch (sk->sk_state) {
	case SMC_ACTIVE:
		smc_close_stream_wait(smc, timeout);
		release_sock(sk);
		cancel_delayed_work_sync(&conn->tx_work);
		lock_sock(sk);
		if (sk->sk_state != SMC_ACTIVE)
			goto again;
		/* send close wr request */
		rc = smc_close_wr(conn);
		sk->sk_state = SMC_PEERCLOSEWAIT1;
		break;
	case SMC_APPCLOSEWAIT1:
		/* passive close */
		if (!smc_cdc_rxed_any_close(conn))
			smc_close_stream_wait(smc, timeout);
		release_sock(sk);
		cancel_delayed_work_sync(&conn->tx_work);
		lock_sock(sk);
		if (sk->sk_state != SMC_APPCLOSEWAIT1)
			goto again;
		/* confirm close from peer */
		rc = smc_close_wr(conn);
		sk->sk_state = SMC_APPCLOSEWAIT2;
		break;
	case SMC_APPCLOSEWAIT2:
	case SMC_PEERFINCLOSEWAIT:
	case SMC_PEERCLOSEWAIT1:
	case SMC_PEERCLOSEWAIT2:
	case SMC_APPFINCLOSEWAIT:
	case SMC_PROCESSABORT:
	case SMC_PEERABORTWAIT:
		/* nothing to do, add tracing in future patch */
		break;
	}

	if (old_state != sk->sk_state)
		sk->sk_state_change(sk);
	return rc;
}

/* Initialize close properties on connection establishment. */
void smc_close_init(struct smc_sock *smc)
{
	INIT_WORK(&smc->conn.close_work, smc_close_passive_work);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
b38d7324 UB	2	/*
	3	* Shared Memory Communications over RDMA (SMC-R) and RoCE
	4	*
	5	* Socket Closing - normal and abnormal
	6	*
	7	* Copyright IBM Corp. 2016
	8	*
	9	* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
	10	*/
	11
	12	#include <linux/workqueue.h>
c3edc401 IM	13	#include <linux/sched/signal.h>
c3edc401 IM	14
b38d7324 UB	15	#include <net/sock.h>
	16
	17	#include "smc.h"
	18	#include "smc_tx.h"
	19	#include "smc_cdc.h"
	20	#include "smc_close.h"
	21
127f4970 UB	22	#define SMC_CLOSE_WAIT_LISTEN_CLCSOCK_TIME (5 * HZ)
127f4970 UB	23
fd57770d KG	24	/* release the clcsock that is assigned to the smc_sock */
	25	void smc_clcsock_release(struct smc_sock *smc)
	26	{
	27	struct socket *tcp;
	28
	29	if (smc->listen_smc && current_work() != &smc->smc_listen_work)
	30	cancel_work_sync(&smc->smc_listen_work);
	31	mutex_lock(&smc->clcsock_release_lock);
	32	if (smc->clcsock) {
	33	tcp = smc->clcsock;
	34	smc->clcsock = NULL;
	35	sock_release(tcp);
	36	}
	37	mutex_unlock(&smc->clcsock_release_lock);
	38	}
	39
b38d7324 UB	40	static void smc_close_cleanup_listen(struct sock *parent)
	41	{
	42	struct sock *sk;
	43
	44	/* Close non-accepted connections */
	45	while ((sk = smc_accept_dequeue(parent, NULL)))
	46	smc_close_non_accepted(sk);
	47	}
	48
b38d7324 UB	49	/* wait for sndbuf data being transmitted */
	50	static void smc_close_stream_wait(struct smc_sock *smc, long timeout)
	51	{
	52	DEFINE_WAIT_FUNC(wait, woken_wake_function);
	53	struct sock *sk = &smc->sk;
	54
	55	if (!timeout)
	56	return;
	57
	58	if (!smc_tx_prepared_sends(&smc->conn))
	59	return;
	60
	61	smc->wait_close_tx_prepared = 1;
	62	add_wait_queue(sk_sleep(sk), &wait);
	63	while (!signal_pending(current) && timeout) {
	64	int rc;
	65
	66	rc = sk_wait_event(sk, &timeout,
	67	!smc_tx_prepared_sends(&smc->conn) \|\|
d18963cf	68	sk->sk_err == ECONNABORTED \|\|
b2900980 UB	69	sk->sk_err == ECONNRESET \|\|
b2900980 UB	70	smc->conn.killed,
b38d7324 UB	71	&wait);
	72	if (rc)
	73	break;
	74	}
	75	remove_wait_queue(sk_sleep(sk), &wait);
	76	smc->wait_close_tx_prepared = 0;
	77	}
	78
	79	void smc_close_wake_tx_prepared(struct smc_sock *smc)
	80	{
	81	if (smc->wait_close_tx_prepared)
	82	/* wake up socket closing */
	83	smc->sk.sk_state_change(&smc->sk);
	84	}
	85
	86	static int smc_close_wr(struct smc_connection *conn)
	87	{
	88	conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1;
	89
	90	return smc_cdc_get_slot_and_msg_send(conn);
	91	}
	92
	93	static int smc_close_final(struct smc_connection *conn)
	94	{
	95	if (atomic_read(&conn->bytes_to_rcv))
	96	conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
	97	else
	98	conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1;
b2900980 UB	99	if (conn->killed)
b2900980 UB	100	return -EPIPE;
b38d7324 UB	101
	102	return smc_cdc_get_slot_and_msg_send(conn);
	103	}
	104
	105	static int smc_close_abort(struct smc_connection *conn)
	106	{
	107	conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
	108
	109	return smc_cdc_get_slot_and_msg_send(conn);
	110	}
	111
	112	/* terminate smc socket abnormally - active abort
732720fa	113	* link group is terminated, i.e. RDMA communication no longer possible
b38d7324	114	*/
a8ae890b	115	static void smc_close_active_abort(struct smc_sock *smc)
b38d7324	116	{
3163c507 UB	117	struct sock *sk = &smc->sk;
3163c507 UB	118
dd65d87a UB	119	if (sk->sk_state != SMC_INIT && smc->clcsock && smc->clcsock->sk) {
	120	sk->sk_err = ECONNABORTED;
	121	if (smc->clcsock && smc->clcsock->sk) {
	122	smc->clcsock->sk->sk_err = ECONNABORTED;
	123	smc->clcsock->sk->sk_state_change(smc->clcsock->sk);
	124	}
b38d7324	125	}
3163c507	126	switch (sk->sk_state) {
46c28dbd	127	case SMC_ACTIVE:
3163c507	128	sk->sk_state = SMC_PEERABORTWAIT;
611b63a1 UB	129	release_sock(sk);
	130	cancel_delayed_work_sync(&smc->conn.tx_work);
	131	lock_sock(sk);
d18963cf	132	sk->sk_state = SMC_CLOSED;
51f1de79	133	sock_put(sk); /* passive closing */
b38d7324 UB	134	break;
	135	case SMC_APPCLOSEWAIT1:
	136	case SMC_APPCLOSEWAIT2:
611b63a1 UB	137	release_sock(sk);
	138	cancel_delayed_work_sync(&smc->conn.tx_work);
	139	lock_sock(sk);
d18963cf	140	sk->sk_state = SMC_CLOSED;
b38d7324 UB	141	break;
	142	case SMC_PEERCLOSEWAIT1:
	143	case SMC_PEERCLOSEWAIT2:
d18963cf UB	144	case SMC_PEERFINCLOSEWAIT:
d18963cf UB	145	sk->sk_state = SMC_CLOSED;
51f1de79	146	sock_put(sk); /* passive closing */
b38d7324 UB	147	break;
	148	case SMC_PROCESSABORT:
	149	case SMC_APPFINCLOSEWAIT:
3163c507	150	sk->sk_state = SMC_CLOSED;
b38d7324	151	break;
dd65d87a	152	case SMC_INIT:
b38d7324 UB	153	case SMC_PEERABORTWAIT:
	154	case SMC_CLOSED:
	155	break;
	156	}
	157
3163c507 UB	158	sock_set_flag(sk, SOCK_DEAD);
3163c507 UB	159	sk->sk_state_change(sk);
b38d7324 UB	160	}
b38d7324 UB	161
a98bf8c0 UB	162	static inline bool smc_close_sent_any_close(struct smc_connection *conn)
	163	{
	164	return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort \|\|
	165	conn->local_tx_ctrl.conn_state_flags.peer_conn_closed;
	166	}
	167
b38d7324 UB	168	int smc_close_active(struct smc_sock *smc)
	169	{
	170	struct smc_cdc_conn_state_flags *txflags =
	171	&smc->conn.local_tx_ctrl.conn_state_flags;
b38d7324 UB	172	struct smc_connection *conn = &smc->conn;
	173	struct sock *sk = &smc->sk;
	174	int old_state;
8c96feee	175	long timeout;
b38d7324 UB	176	int rc = 0;
b38d7324 UB	177
8c96feee UB	178	timeout = current->flags & PF_EXITING ?
	179	0 : sock_flag(sk, SOCK_LINGER) ?
	180	sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
b38d7324	181
b38d7324	182	old_state = sk->sk_state;
bbb96bf2 UB	183	again:
bbb96bf2 UB	184	switch (sk->sk_state) {
b38d7324 UB	185	case SMC_INIT:
b38d7324 UB	186	sk->sk_state = SMC_CLOSED;
b38d7324 UB	187	break;
	188	case SMC_LISTEN:
	189	sk->sk_state = SMC_CLOSED;
	190	sk->sk_state_change(sk); /* wake up accept */
	191	if (smc->clcsock && smc->clcsock->sk) {
	192	rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
	193	/* wake up kernel_accept of smc_tcp_listen_worker */
	194	smc->clcsock->sk->sk_data_ready(smc->clcsock->sk);
	195	}
b38d7324	196	smc_close_cleanup_listen(sk);
3d502067 UB	197	release_sock(sk);
	198	flush_work(&smc->tcp_listen_work);
	199	lock_sock(sk);
b38d7324 UB	200	break;
	201	case SMC_ACTIVE:
	202	smc_close_stream_wait(smc, timeout);
	203	release_sock(sk);
18e537cd	204	cancel_delayed_work_sync(&conn->tx_work);
b38d7324 UB	205	lock_sock(sk);
	206	if (sk->sk_state == SMC_ACTIVE) {
	207	/* send close request */
	208	rc = smc_close_final(conn);
	209	sk->sk_state = SMC_PEERCLOSEWAIT1;
	210	} else {
	211	/* peer event has changed the state */
	212	goto again;
	213	}
	214	break;
	215	case SMC_APPFINCLOSEWAIT:
	216	/* socket already shutdown wr or both (active close) */
	217	if (txflags->peer_done_writing &&
a98bf8c0	218	!smc_close_sent_any_close(conn)) {
b38d7324 UB	219	/* just shutdown wr done, send close request */
	220	rc = smc_close_final(conn);
	221	}
	222	sk->sk_state = SMC_CLOSED;
b38d7324 UB	223	break;
	224	case SMC_APPCLOSEWAIT1:
	225	case SMC_APPCLOSEWAIT2:
	226	if (!smc_cdc_rxed_any_close(conn))
	227	smc_close_stream_wait(smc, timeout);
	228	release_sock(sk);
18e537cd	229	cancel_delayed_work_sync(&conn->tx_work);
b38d7324	230	lock_sock(sk);
bbb96bf2 UB	231	if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
	232	sk->sk_state != SMC_APPCLOSEWAIT2)
	233	goto again;
	234	/* confirm close from peer */
	235	rc = smc_close_final(conn);
51f1de79	236	if (smc_cdc_rxed_any_close(conn)) {
b38d7324 UB	237	/* peer has closed the socket already */
b38d7324 UB	238	sk->sk_state = SMC_CLOSED;
51f1de79 UB	239	sock_put(sk); /* postponed passive closing */
51f1de79 UB	240	} else {
b38d7324 UB	241	/* peer has just issued a shutdown write */
b38d7324 UB	242	sk->sk_state = SMC_PEERFINCLOSEWAIT;
51f1de79	243	}
b38d7324 UB	244	break;
	245	case SMC_PEERCLOSEWAIT1:
	246	case SMC_PEERCLOSEWAIT2:
a98bf8c0 UB	247	if (txflags->peer_done_writing &&
	248	!smc_close_sent_any_close(conn)) {
	249	/* just shutdown wr done, send close request */
	250	rc = smc_close_final(conn);
	251	}
	252	/* peer sending PeerConnectionClosed will cause transition */
	253	break;
b38d7324 UB	254	case SMC_PEERFINCLOSEWAIT:
	255	/* peer sending PeerConnectionClosed will cause transition */
	256	break;
	257	case SMC_PROCESSABORT:
d18963cf	258	rc = smc_close_abort(conn);
b38d7324	259	sk->sk_state = SMC_CLOSED;
b38d7324 UB	260	break;
b38d7324 UB	261	case SMC_PEERABORTWAIT:
d18963cf UB	262	sk->sk_state = SMC_CLOSED;
d18963cf UB	263	break;
b38d7324 UB	264	case SMC_CLOSED:
	265	/* nothing to do, add tracing in future patch */
	266	break;
	267	}
	268
	269	if (old_state != sk->sk_state)
3163c507	270	sk->sk_state_change(sk);
b38d7324 UB	271	return rc;
	272	}
	273
	274	static void smc_close_passive_abort_received(struct smc_sock *smc)
	275	{
	276	struct smc_cdc_conn_state_flags *txflags =
	277	&smc->conn.local_tx_ctrl.conn_state_flags;
	278	struct sock *sk = &smc->sk;
	279
	280	switch (sk->sk_state) {
51f1de79	281	case SMC_INIT:
b38d7324	282	case SMC_ACTIVE:
b38d7324	283	case SMC_APPCLOSEWAIT1:
51f1de79 UB	284	sk->sk_state = SMC_PROCESSABORT;
	285	sock_put(sk); /* passive closing */
	286	break;
	287	case SMC_APPFINCLOSEWAIT:
b38d7324 UB	288	sk->sk_state = SMC_PROCESSABORT;
	289	break;
	290	case SMC_PEERCLOSEWAIT1:
	291	case SMC_PEERCLOSEWAIT2:
	292	if (txflags->peer_done_writing &&
51f1de79	293	!smc_close_sent_any_close(&smc->conn))
b38d7324	294	/* just shutdown, but not yet closed locally */
b38d7324	295	sk->sk_state = SMC_PROCESSABORT;
51f1de79	296	else
b38d7324	297	sk->sk_state = SMC_CLOSED;
51f1de79	298	sock_put(sk); /* passive closing */
b38d7324	299	break;
51f1de79	300	case SMC_APPCLOSEWAIT2:
b38d7324	301	case SMC_PEERFINCLOSEWAIT:
51f1de79 UB	302	sk->sk_state = SMC_CLOSED;
	303	sock_put(sk); /* passive closing */
	304	break;
b38d7324 UB	305	case SMC_PEERABORTWAIT:
	306	sk->sk_state = SMC_CLOSED;
	307	break;
b38d7324 UB	308	case SMC_PROCESSABORT:
	309	/* nothing to do, add tracing in future patch */
	310	break;
	311	}
	312	}
	313
732720fa UB	314	/* Either some kind of closing has been received: peer_conn_closed,
	315	* peer_conn_abort, or peer_done_writing
	316	* or the link group of the connection terminates abnormally.
b38d7324	317	*/
46c28dbd	318	static void smc_close_passive_work(struct work_struct *work)
b38d7324	319	{
46c28dbd UB	320	struct smc_connection *conn = container_of(work,
	321	struct smc_connection,
	322	close_work);
	323	struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
	324	struct smc_cdc_conn_state_flags *rxflags;
fd57770d	325	bool release_clcsock = false;
b38d7324 UB	326	struct sock *sk = &smc->sk;
	327	int old_state;
	328
3163c507	329	lock_sock(sk);
b38d7324 UB	330	old_state = sk->sk_state;
b38d7324 UB	331
b2900980	332	if (conn->killed) {
46c28dbd UB	333	/* abnormal termination */
	334	smc_close_active_abort(smc);
	335	goto wakeup;
	336	}
	337
3163c507	338	rxflags = &conn->local_rx_ctrl.conn_state_flags;
b38d7324	339	if (rxflags->peer_conn_abort) {
732720fa	340	/* peer has not received all data */
b38d7324	341	smc_close_passive_abort_received(smc);
611b63a1 UB	342	release_sock(&smc->sk);
	343	cancel_delayed_work_sync(&conn->tx_work);
	344	lock_sock(&smc->sk);
b38d7324 UB	345	goto wakeup;
	346	}
	347
	348	switch (sk->sk_state) {
	349	case SMC_INIT:
84b799a2	350	sk->sk_state = SMC_APPCLOSEWAIT1;
b38d7324 UB	351	break;
	352	case SMC_ACTIVE:
	353	sk->sk_state = SMC_APPCLOSEWAIT1;
51f1de79 UB	354	/* postpone sock_put() for passive closing to cover
	355	* received SEND_SHUTDOWN as well
	356	*/
b38d7324 UB	357	break;
	358	case SMC_PEERCLOSEWAIT1:
	359	if (rxflags->peer_done_writing)
	360	sk->sk_state = SMC_PEERCLOSEWAIT2;
7f6b437e GS	361	/* fall through */
7f6b437e GS	362	/* to check for closing */
b38d7324	363	case SMC_PEERCLOSEWAIT2:
3163c507	364	if (!smc_cdc_rxed_any_close(conn))
b38d7324 UB	365	break;
b38d7324 UB	366	if (sock_flag(sk, SOCK_DEAD) &&
a98bf8c0	367	smc_close_sent_any_close(conn)) {
b38d7324 UB	368	/* smc_release has already been called locally */
	369	sk->sk_state = SMC_CLOSED;
	370	} else {
	371	/* just shutdown, but not yet closed locally */
	372	sk->sk_state = SMC_APPFINCLOSEWAIT;
	373	}
51f1de79	374	sock_put(sk); /* passive closing */
b38d7324	375	break;
5ac92a00	376	case SMC_PEERFINCLOSEWAIT:
51f1de79	377	if (smc_cdc_rxed_any_close(conn)) {
5ac92a00	378	sk->sk_state = SMC_CLOSED;
51f1de79 UB	379	sock_put(sk); /* passive closing */
51f1de79 UB	380	}
5ac92a00	381	break;
b38d7324 UB	382	case SMC_APPCLOSEWAIT1:
b38d7324 UB	383	case SMC_APPCLOSEWAIT2:
51f1de79 UB	384	/* postpone sock_put() for passive closing to cover
	385	* received SEND_SHUTDOWN as well
	386	*/
	387	break;
b38d7324 UB	388	case SMC_APPFINCLOSEWAIT:
	389	case SMC_PEERABORTWAIT:
	390	case SMC_PROCESSABORT:
	391	case SMC_CLOSED:
	392	/* nothing to do, add tracing in future patch */
	393	break;
	394	}
	395
	396	wakeup:
b38d7324 UB	397	sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
	398	sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
	399
a98bf8c0 UB	400	if (old_state != sk->sk_state) {
	401	sk->sk_state_change(sk);
	402	if ((sk->sk_state == SMC_CLOSED) &&
b03faa1f	403	(sock_flag(sk, SOCK_DEAD) \|\| !sk->sk_socket)) {
3163c507	404	smc_conn_free(conn);
fd57770d KG	405	if (smc->clcsock)
fd57770d KG	406	release_clcsock = true;
b03faa1f	407	}
b38d7324	408	}
3163c507	409	release_sock(sk);
fd57770d KG	410	if (release_clcsock)
fd57770d KG	411	smc_clcsock_release(smc);
51f1de79	412	sock_put(sk); /* sock_hold done by schedulers of close_work */
b38d7324 UB	413	}
	414
	415	int smc_close_shutdown_write(struct smc_sock *smc)
	416	{
	417	struct smc_connection *conn = &smc->conn;
b38d7324 UB	418	struct sock *sk = &smc->sk;
b38d7324 UB	419	int old_state;
8c96feee	420	long timeout;
b38d7324 UB	421	int rc = 0;
b38d7324 UB	422
8c96feee UB	423	timeout = current->flags & PF_EXITING ?
	424	0 : sock_flag(sk, SOCK_LINGER) ?
	425	sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
b38d7324	426
b38d7324	427	old_state = sk->sk_state;
bbb96bf2 UB	428	again:
bbb96bf2 UB	429	switch (sk->sk_state) {
b38d7324 UB	430	case SMC_ACTIVE:
	431	smc_close_stream_wait(smc, timeout);
	432	release_sock(sk);
18e537cd	433	cancel_delayed_work_sync(&conn->tx_work);
b38d7324	434	lock_sock(sk);
bbb96bf2 UB	435	if (sk->sk_state != SMC_ACTIVE)
bbb96bf2 UB	436	goto again;
b38d7324 UB	437	/* send close wr request */
b38d7324 UB	438	rc = smc_close_wr(conn);
bbb96bf2	439	sk->sk_state = SMC_PEERCLOSEWAIT1;
b38d7324 UB	440	break;
	441	case SMC_APPCLOSEWAIT1:
	442	/* passive close */
	443	if (!smc_cdc_rxed_any_close(conn))
	444	smc_close_stream_wait(smc, timeout);
	445	release_sock(sk);
18e537cd	446	cancel_delayed_work_sync(&conn->tx_work);
b38d7324	447	lock_sock(sk);
bbb96bf2 UB	448	if (sk->sk_state != SMC_APPCLOSEWAIT1)
bbb96bf2 UB	449	goto again;
b38d7324 UB	450	/* confirm close from peer */
	451	rc = smc_close_wr(conn);
	452	sk->sk_state = SMC_APPCLOSEWAIT2;
	453	break;
	454	case SMC_APPCLOSEWAIT2:
	455	case SMC_PEERFINCLOSEWAIT:
	456	case SMC_PEERCLOSEWAIT1:
	457	case SMC_PEERCLOSEWAIT2:
	458	case SMC_APPFINCLOSEWAIT:
	459	case SMC_PROCESSABORT:
	460	case SMC_PEERABORTWAIT:
	461	/* nothing to do, add tracing in future patch */
	462	break;
	463	}
	464
	465	if (old_state != sk->sk_state)
3163c507	466	sk->sk_state_change(sk);
b38d7324 UB	467	return rc;
b38d7324 UB	468	}
46c28dbd UB	469
	470	/* Initialize close properties on connection establishment. */
	471	void smc_close_init(struct smc_sock *smc)
	472	{
	473	INIT_WORK(&smc->conn.close_work, smc_close_passive_work);
	474	}