[linux-2.6-block.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),
				   &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;

	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;

	struct smc_cdc_conn_state_flags *txflags =
		&smc->conn.local_tx_ctrl.conn_state_flags;

	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);
		sock_put(sk); /* passive closing */
		break;
	case SMC_APPCLOSEWAIT1:
	case SMC_APPCLOSEWAIT2:
		if (!smc_cdc_rxed_any_close(&smc->conn))
			sk->sk_state = SMC_PEERABORTWAIT;
		else
			sk->sk_state = SMC_CLOSED;
		release_sock(sk);
		cancel_delayed_work_sync(&smc->conn.tx_work);
		lock_sock(sk);
		break;
	case SMC_PEERCLOSEWAIT1:
	case SMC_PEERCLOSEWAIT2:
		if (!txflags->peer_conn_closed) {
			/* just SHUTDOWN_SEND done */
			sk->sk_state = SMC_PEERABORTWAIT;
		} else {
			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_PEERFINCLOSEWAIT:
		sock_put(sk); /* passive closing */
		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);
			if (rc)
				break;
			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);
			if (rc)
				break;
		}
		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 (rc)
			break;
		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);
			if (rc)
				break;
		}
		/* peer sending PeerConnectionClosed will cause transition */
		break;
	case SMC_PEERFINCLOSEWAIT:
		/* peer sending PeerConnectionClosed will cause transition */
		break;
	case SMC_PROCESSABORT:
		smc_close_abort(conn);
		sk->sk_state = SMC_CLOSED;
		break;
	case SMC_PEERABORTWAIT:
	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->alert_token_local) {
		/* 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);
		if (rc)
			break;
		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);
		if (rc)
			break;
		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) \|\|
	68	(sk->sk_err == ECONNABORTED) \|\|
	69	(sk->sk_err == ECONNRESET),
	70	&wait);
	71	if (rc)
	72	break;
	73	}
	74	remove_wait_queue(sk_sleep(sk), &wait);
	75	smc->wait_close_tx_prepared = 0;
	76	}
	77
	78	void smc_close_wake_tx_prepared(struct smc_sock *smc)
	79	{
	80	if (smc->wait_close_tx_prepared)
	81	/* wake up socket closing */
	82	smc->sk.sk_state_change(&smc->sk);
	83	}
	84
	85	static int smc_close_wr(struct smc_connection *conn)
	86	{
	87	conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1;
	88
	89	return smc_cdc_get_slot_and_msg_send(conn);
	90	}
	91
	92	static int smc_close_final(struct smc_connection *conn)
	93	{
	94	if (atomic_read(&conn->bytes_to_rcv))
	95	conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
	96	else
	97	conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1;
	98
	99	return smc_cdc_get_slot_and_msg_send(conn);
	100	}
	101
	102	static int smc_close_abort(struct smc_connection *conn)
	103	{
	104	conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
	105
	106	return smc_cdc_get_slot_and_msg_send(conn);
	107	}
	108
	109	/* terminate smc socket abnormally - active abort
732720fa	110	* link group is terminated, i.e. RDMA communication no longer possible
b38d7324	111	*/
a8ae890b	112	static void smc_close_active_abort(struct smc_sock *smc)
b38d7324	113	{
3163c507 UB	114	struct sock *sk = &smc->sk;
3163c507 UB	115
b38d7324 UB	116	struct smc_cdc_conn_state_flags *txflags =
	117	&smc->conn.local_tx_ctrl.conn_state_flags;
	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);
51f1de79	132	sock_put(sk); /* passive closing */
b38d7324 UB	133	break;
	134	case SMC_APPCLOSEWAIT1:
	135	case SMC_APPCLOSEWAIT2:
b38d7324	136	if (!smc_cdc_rxed_any_close(&smc->conn))
3163c507	137	sk->sk_state = SMC_PEERABORTWAIT;
b38d7324	138	else
3163c507	139	sk->sk_state = SMC_CLOSED;
611b63a1 UB	140	release_sock(sk);
	141	cancel_delayed_work_sync(&smc->conn.tx_work);
	142	lock_sock(sk);
b38d7324 UB	143	break;
	144	case SMC_PEERCLOSEWAIT1:
	145	case SMC_PEERCLOSEWAIT2:
	146	if (!txflags->peer_conn_closed) {
51f1de79	147	/* just SHUTDOWN_SEND done */
3163c507	148	sk->sk_state = SMC_PEERABORTWAIT;
b38d7324	149	} else {
3163c507	150	sk->sk_state = SMC_CLOSED;
b38d7324	151	}
51f1de79	152	sock_put(sk); /* passive closing */
b38d7324 UB	153	break;
	154	case SMC_PROCESSABORT:
	155	case SMC_APPFINCLOSEWAIT:
3163c507	156	sk->sk_state = SMC_CLOSED;
b38d7324 UB	157	break;
b38d7324 UB	158	case SMC_PEERFINCLOSEWAIT:
51f1de79 UB	159	sock_put(sk); /* passive closing */
51f1de79 UB	160	break;
dd65d87a	161	case SMC_INIT:
b38d7324 UB	162	case SMC_PEERABORTWAIT:
	163	case SMC_CLOSED:
	164	break;
	165	}
	166
3163c507 UB	167	sock_set_flag(sk, SOCK_DEAD);
3163c507 UB	168	sk->sk_state_change(sk);
b38d7324 UB	169	}
b38d7324 UB	170
a98bf8c0 UB	171	static inline bool smc_close_sent_any_close(struct smc_connection *conn)
	172	{
	173	return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort \|\|
	174	conn->local_tx_ctrl.conn_state_flags.peer_conn_closed;
	175	}
	176
b38d7324 UB	177	int smc_close_active(struct smc_sock *smc)
	178	{
	179	struct smc_cdc_conn_state_flags *txflags =
	180	&smc->conn.local_tx_ctrl.conn_state_flags;
b38d7324 UB	181	struct smc_connection *conn = &smc->conn;
	182	struct sock *sk = &smc->sk;
	183	int old_state;
8c96feee	184	long timeout;
b38d7324 UB	185	int rc = 0;
b38d7324 UB	186
8c96feee UB	187	timeout = current->flags & PF_EXITING ?
	188	0 : sock_flag(sk, SOCK_LINGER) ?
	189	sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
b38d7324	190
b38d7324	191	old_state = sk->sk_state;
bbb96bf2 UB	192	again:
bbb96bf2 UB	193	switch (sk->sk_state) {
b38d7324 UB	194	case SMC_INIT:
b38d7324 UB	195	sk->sk_state = SMC_CLOSED;
b38d7324 UB	196	break;
	197	case SMC_LISTEN:
	198	sk->sk_state = SMC_CLOSED;
	199	sk->sk_state_change(sk); /* wake up accept */
	200	if (smc->clcsock && smc->clcsock->sk) {
	201	rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
	202	/* wake up kernel_accept of smc_tcp_listen_worker */
	203	smc->clcsock->sk->sk_data_ready(smc->clcsock->sk);
	204	}
b38d7324	205	smc_close_cleanup_listen(sk);
3d502067 UB	206	release_sock(sk);
	207	flush_work(&smc->tcp_listen_work);
	208	lock_sock(sk);
b38d7324 UB	209	break;
	210	case SMC_ACTIVE:
	211	smc_close_stream_wait(smc, timeout);
	212	release_sock(sk);
18e537cd	213	cancel_delayed_work_sync(&conn->tx_work);
b38d7324 UB	214	lock_sock(sk);
	215	if (sk->sk_state == SMC_ACTIVE) {
	216	/* send close request */
	217	rc = smc_close_final(conn);
bbb96bf2 UB	218	if (rc)
bbb96bf2 UB	219	break;
b38d7324 UB	220	sk->sk_state = SMC_PEERCLOSEWAIT1;
	221	} else {
	222	/* peer event has changed the state */
	223	goto again;
	224	}
	225	break;
	226	case SMC_APPFINCLOSEWAIT:
	227	/* socket already shutdown wr or both (active close) */
	228	if (txflags->peer_done_writing &&
a98bf8c0	229	!smc_close_sent_any_close(conn)) {
b38d7324 UB	230	/* just shutdown wr done, send close request */
b38d7324 UB	231	rc = smc_close_final(conn);
bbb96bf2 UB	232	if (rc)
bbb96bf2 UB	233	break;
b38d7324 UB	234	}
b38d7324 UB	235	sk->sk_state = SMC_CLOSED;
b38d7324 UB	236	break;
	237	case SMC_APPCLOSEWAIT1:
	238	case SMC_APPCLOSEWAIT2:
	239	if (!smc_cdc_rxed_any_close(conn))
	240	smc_close_stream_wait(smc, timeout);
	241	release_sock(sk);
18e537cd	242	cancel_delayed_work_sync(&conn->tx_work);
b38d7324	243	lock_sock(sk);
bbb96bf2 UB	244	if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
	245	sk->sk_state != SMC_APPCLOSEWAIT2)
	246	goto again;
	247	/* confirm close from peer */
	248	rc = smc_close_final(conn);
	249	if (rc)
	250	break;
51f1de79	251	if (smc_cdc_rxed_any_close(conn)) {
b38d7324 UB	252	/* peer has closed the socket already */
b38d7324 UB	253	sk->sk_state = SMC_CLOSED;
51f1de79 UB	254	sock_put(sk); /* postponed passive closing */
51f1de79 UB	255	} else {
b38d7324 UB	256	/* peer has just issued a shutdown write */
b38d7324 UB	257	sk->sk_state = SMC_PEERFINCLOSEWAIT;
51f1de79	258	}
b38d7324 UB	259	break;
	260	case SMC_PEERCLOSEWAIT1:
	261	case SMC_PEERCLOSEWAIT2:
a98bf8c0 UB	262	if (txflags->peer_done_writing &&
	263	!smc_close_sent_any_close(conn)) {
	264	/* just shutdown wr done, send close request */
	265	rc = smc_close_final(conn);
bbb96bf2 UB	266	if (rc)
bbb96bf2 UB	267	break;
a98bf8c0 UB	268	}
	269	/* peer sending PeerConnectionClosed will cause transition */
	270	break;
b38d7324 UB	271	case SMC_PEERFINCLOSEWAIT:
	272	/* peer sending PeerConnectionClosed will cause transition */
	273	break;
	274	case SMC_PROCESSABORT:
b38d7324 UB	275	smc_close_abort(conn);
b38d7324 UB	276	sk->sk_state = SMC_CLOSED;
b38d7324 UB	277	break;
	278	case SMC_PEERABORTWAIT:
	279	case SMC_CLOSED:
	280	/* nothing to do, add tracing in future patch */
	281	break;
	282	}
	283
	284	if (old_state != sk->sk_state)
3163c507	285	sk->sk_state_change(sk);
b38d7324 UB	286	return rc;
	287	}
	288
	289	static void smc_close_passive_abort_received(struct smc_sock *smc)
	290	{
	291	struct smc_cdc_conn_state_flags *txflags =
	292	&smc->conn.local_tx_ctrl.conn_state_flags;
	293	struct sock *sk = &smc->sk;
	294
	295	switch (sk->sk_state) {
51f1de79	296	case SMC_INIT:
b38d7324	297	case SMC_ACTIVE:
b38d7324	298	case SMC_APPCLOSEWAIT1:
51f1de79 UB	299	sk->sk_state = SMC_PROCESSABORT;
	300	sock_put(sk); /* passive closing */
	301	break;
	302	case SMC_APPFINCLOSEWAIT:
b38d7324 UB	303	sk->sk_state = SMC_PROCESSABORT;
	304	break;
	305	case SMC_PEERCLOSEWAIT1:
	306	case SMC_PEERCLOSEWAIT2:
	307	if (txflags->peer_done_writing &&
51f1de79	308	!smc_close_sent_any_close(&smc->conn))
b38d7324	309	/* just shutdown, but not yet closed locally */
b38d7324	310	sk->sk_state = SMC_PROCESSABORT;
51f1de79	311	else
b38d7324	312	sk->sk_state = SMC_CLOSED;
51f1de79	313	sock_put(sk); /* passive closing */
b38d7324	314	break;
51f1de79	315	case SMC_APPCLOSEWAIT2:
b38d7324	316	case SMC_PEERFINCLOSEWAIT:
51f1de79 UB	317	sk->sk_state = SMC_CLOSED;
	318	sock_put(sk); /* passive closing */
	319	break;
b38d7324 UB	320	case SMC_PEERABORTWAIT:
	321	sk->sk_state = SMC_CLOSED;
	322	break;
b38d7324 UB	323	case SMC_PROCESSABORT:
	324	/* nothing to do, add tracing in future patch */
	325	break;
	326	}
	327	}
	328
732720fa UB	329	/* Either some kind of closing has been received: peer_conn_closed,
	330	* peer_conn_abort, or peer_done_writing
	331	* or the link group of the connection terminates abnormally.
b38d7324	332	*/
46c28dbd	333	static void smc_close_passive_work(struct work_struct *work)
b38d7324	334	{
46c28dbd UB	335	struct smc_connection *conn = container_of(work,
	336	struct smc_connection,
	337	close_work);
	338	struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
	339	struct smc_cdc_conn_state_flags *rxflags;
fd57770d	340	bool release_clcsock = false;
b38d7324 UB	341	struct sock *sk = &smc->sk;
	342	int old_state;
	343
3163c507	344	lock_sock(sk);
b38d7324 UB	345	old_state = sk->sk_state;
b38d7324 UB	346
46c28dbd UB	347	if (!conn->alert_token_local) {
	348	/* abnormal termination */
	349	smc_close_active_abort(smc);
	350	goto wakeup;
	351	}
	352
3163c507	353	rxflags = &conn->local_rx_ctrl.conn_state_flags;
b38d7324	354	if (rxflags->peer_conn_abort) {
732720fa	355	/* peer has not received all data */
b38d7324	356	smc_close_passive_abort_received(smc);
611b63a1 UB	357	release_sock(&smc->sk);
	358	cancel_delayed_work_sync(&conn->tx_work);
	359	lock_sock(&smc->sk);
b38d7324 UB	360	goto wakeup;
	361	}
	362
	363	switch (sk->sk_state) {
	364	case SMC_INIT:
84b799a2	365	sk->sk_state = SMC_APPCLOSEWAIT1;
b38d7324 UB	366	break;
	367	case SMC_ACTIVE:
	368	sk->sk_state = SMC_APPCLOSEWAIT1;
51f1de79 UB	369	/* postpone sock_put() for passive closing to cover
	370	* received SEND_SHUTDOWN as well
	371	*/
b38d7324 UB	372	break;
	373	case SMC_PEERCLOSEWAIT1:
	374	if (rxflags->peer_done_writing)
	375	sk->sk_state = SMC_PEERCLOSEWAIT2;
7f6b437e GS	376	/* fall through */
7f6b437e GS	377	/* to check for closing */
b38d7324	378	case SMC_PEERCLOSEWAIT2:
3163c507	379	if (!smc_cdc_rxed_any_close(conn))
b38d7324 UB	380	break;
b38d7324 UB	381	if (sock_flag(sk, SOCK_DEAD) &&
a98bf8c0	382	smc_close_sent_any_close(conn)) {
b38d7324 UB	383	/* smc_release has already been called locally */
	384	sk->sk_state = SMC_CLOSED;
	385	} else {
	386	/* just shutdown, but not yet closed locally */
	387	sk->sk_state = SMC_APPFINCLOSEWAIT;
	388	}
51f1de79	389	sock_put(sk); /* passive closing */
b38d7324	390	break;
5ac92a00	391	case SMC_PEERFINCLOSEWAIT:
51f1de79	392	if (smc_cdc_rxed_any_close(conn)) {
5ac92a00	393	sk->sk_state = SMC_CLOSED;
51f1de79 UB	394	sock_put(sk); /* passive closing */
51f1de79 UB	395	}
5ac92a00	396	break;
b38d7324 UB	397	case SMC_APPCLOSEWAIT1:
b38d7324 UB	398	case SMC_APPCLOSEWAIT2:
51f1de79 UB	399	/* postpone sock_put() for passive closing to cover
	400	* received SEND_SHUTDOWN as well
	401	*/
	402	break;
b38d7324 UB	403	case SMC_APPFINCLOSEWAIT:
	404	case SMC_PEERABORTWAIT:
	405	case SMC_PROCESSABORT:
	406	case SMC_CLOSED:
	407	/* nothing to do, add tracing in future patch */
	408	break;
	409	}
	410
	411	wakeup:
b38d7324 UB	412	sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
	413	sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
	414
a98bf8c0 UB	415	if (old_state != sk->sk_state) {
	416	sk->sk_state_change(sk);
	417	if ((sk->sk_state == SMC_CLOSED) &&
b03faa1f	418	(sock_flag(sk, SOCK_DEAD) \|\| !sk->sk_socket)) {
3163c507	419	smc_conn_free(conn);
fd57770d KG	420	if (smc->clcsock)
fd57770d KG	421	release_clcsock = true;
b03faa1f	422	}
b38d7324	423	}
3163c507	424	release_sock(sk);
fd57770d KG	425	if (release_clcsock)
fd57770d KG	426	smc_clcsock_release(smc);
51f1de79	427	sock_put(sk); /* sock_hold done by schedulers of close_work */
b38d7324 UB	428	}
	429
	430	int smc_close_shutdown_write(struct smc_sock *smc)
	431	{
	432	struct smc_connection *conn = &smc->conn;
b38d7324 UB	433	struct sock *sk = &smc->sk;
b38d7324 UB	434	int old_state;
8c96feee	435	long timeout;
b38d7324 UB	436	int rc = 0;
b38d7324 UB	437
8c96feee UB	438	timeout = current->flags & PF_EXITING ?
	439	0 : sock_flag(sk, SOCK_LINGER) ?
	440	sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
b38d7324	441
b38d7324	442	old_state = sk->sk_state;
bbb96bf2 UB	443	again:
bbb96bf2 UB	444	switch (sk->sk_state) {
b38d7324 UB	445	case SMC_ACTIVE:
	446	smc_close_stream_wait(smc, timeout);
	447	release_sock(sk);
18e537cd	448	cancel_delayed_work_sync(&conn->tx_work);
b38d7324	449	lock_sock(sk);
bbb96bf2 UB	450	if (sk->sk_state != SMC_ACTIVE)
bbb96bf2 UB	451	goto again;
b38d7324 UB	452	/* send close wr request */
b38d7324 UB	453	rc = smc_close_wr(conn);
bbb96bf2 UB	454	if (rc)
	455	break;
	456	sk->sk_state = SMC_PEERCLOSEWAIT1;
b38d7324 UB	457	break;
	458	case SMC_APPCLOSEWAIT1:
	459	/* passive close */
	460	if (!smc_cdc_rxed_any_close(conn))
	461	smc_close_stream_wait(smc, timeout);
	462	release_sock(sk);
18e537cd	463	cancel_delayed_work_sync(&conn->tx_work);
b38d7324	464	lock_sock(sk);
bbb96bf2 UB	465	if (sk->sk_state != SMC_APPCLOSEWAIT1)
bbb96bf2 UB	466	goto again;
b38d7324 UB	467	/* confirm close from peer */
b38d7324 UB	468	rc = smc_close_wr(conn);
bbb96bf2 UB	469	if (rc)
bbb96bf2 UB	470	break;
b38d7324 UB	471	sk->sk_state = SMC_APPCLOSEWAIT2;
	472	break;
	473	case SMC_APPCLOSEWAIT2:
	474	case SMC_PEERFINCLOSEWAIT:
	475	case SMC_PEERCLOSEWAIT1:
	476	case SMC_PEERCLOSEWAIT2:
	477	case SMC_APPFINCLOSEWAIT:
	478	case SMC_PROCESSABORT:
	479	case SMC_PEERABORTWAIT:
	480	/* nothing to do, add tracing in future patch */
	481	break;
	482	}
	483
	484	if (old_state != sk->sk_state)
3163c507	485	sk->sk_state_change(sk);
b38d7324 UB	486	return rc;
b38d7324 UB	487	}
46c28dbd UB	488
	489	/* Initialize close properties on connection establishment. */
	490	void smc_close_init(struct smc_sock *smc)
	491	{
	492	INIT_WORK(&smc->conn.close_work, smc_close_passive_work);
	493	}