Merge branch 'smc-next'

Karsten Graul says:

====================
net/smc: updates 2020-09-10

Please apply the following patch series for smc to netdev's net-next tree.

This patch series is a mix of various improvements and cleanups.
The patches 1 and 10 improve the handling of large parallel workloads.
Patch 8 corrects a kernel config default for config CCWGROUP on s390.
Patch 9 allows userspace tools to retrieve socket information for more
sockets.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/Kconfig

@@ -107,7 +107,7 @@ config QETH_OSX
 
 config CCWGROUP
 	tristate
-	default (LCS || CTCM || QETH)
+	default (LCS || CTCM || QETH || SMC)
 
 config ISM
 	tristate "Support for ISM vPCI Adapter"

net/smc/smc.h

@@ -18,6 +18,8 @@
 
 #include "smc_ib.h"
 
+#define SMC_V1		1		/* SMC version V1 */
+
 #define SMCPROTO_SMC		0	/* SMC protocol, IPv4 */
 #define SMCPROTO_SMC6		1	/* SMC protocol, IPv6 */
 
@@ -201,6 +203,8 @@ struct smc_connection {
 struct smc_sock {				/* smc sock container */
 	struct sock		sk;
 	struct socket		*clcsock;	/* internal tcp socket */
+	void			(*clcsk_data_ready)(struct sock *sk);
+						/* original data_ready fct. **/
 	struct smc_connection	conn;		/* smc connection */
 	struct smc_sock		*listen_smc;	/* listen parent */
 	struct work_struct	connect_work;	/* handle non-blocking connect*/
@@ -235,6 +239,9 @@ static inline struct smc_sock *smc_sk(const struct sock *sk)
 	return (struct smc_sock *)sk;
 }
 
+extern struct workqueue_struct	*smc_hs_wq;	/* wq for handshake work */
+extern struct workqueue_struct	*smc_close_wq;	/* wq for close work */
+
 #define SMC_SYSTEMID_LEN		8
 
 extern u8	local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */

net/smc/smc_cdc.c

@@ -299,7 +299,7 @@ static void smc_cdc_msg_validate(struct smc_sock *smc, struct smc_cdc_msg *cdc,
 		conn->lnk = link;
 		spin_unlock_bh(&conn->send_lock);
 		sock_hold(&smc->sk); /* sock_put in abort_work */
-		if (!schedule_work(&conn->abort_work))
+		if (!queue_work(smc_close_wq, &conn->abort_work))
 			sock_put(&smc->sk);
 	}
 }
@@ -368,7 +368,7 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc,
 			smc->clcsock->sk->sk_shutdown |= RCV_SHUTDOWN;
 		sock_set_flag(&smc->sk, SOCK_DONE);
 		sock_hold(&smc->sk); /* sock_put in close_work */
-		if (!schedule_work(&conn->close_work))
+		if (!queue_work(smc_close_wq, &conn->close_work))
 			sock_put(&smc->sk);
 	}
 }

net/smc/smc_clc.h

@@ -22,7 +22,6 @@
 #define SMC_CLC_CONFIRM		0x03
 #define SMC_CLC_DECLINE		0x04
 
-#define SMC_CLC_V1		0x1		/* SMC version                */
 #define SMC_TYPE_R		0		/* SMC-R only		      */
 #define SMC_TYPE_D		1		/* SMC-D only		      */
 #define SMC_TYPE_N		2		/* neither SMC-R nor SMC-D    */
@@ -38,7 +37,6 @@
 #define SMC_CLC_DECL_NOSMCDEV	0x03030000  /* no SMC device found (R or D)   */
 #define SMC_CLC_DECL_NOSMCDDEV	0x03030001  /* no SMC-D device found	      */
 #define SMC_CLC_DECL_NOSMCRDEV	0x03030002  /* no SMC-R device found	      */
-#define SMC_CLC_DECL_SMCDNOTALK	0x03030003  /* SMC-D dev can't talk to peer   */
 #define SMC_CLC_DECL_MODEUNSUPP	0x03040000  /* smc modes do not match (R or D)*/
 #define SMC_CLC_DECL_RMBE_EC	0x03050000  /* peer has eyecatcher in RMBE    */
 #define SMC_CLC_DECL_OPTUNSUPP	0x03060000  /* fastopen sockopt not supported */
@@ -111,25 +109,21 @@ struct smc_clc_msg_proposal {	/* clc proposal message sent by Linux */
 	__be16 iparea_offset;	/* offset to IP address information area */
 } __aligned(4);
 
-#define SMC_CLC_PROPOSAL_MAX_OFFSET	0x28
-#define SMC_CLC_PROPOSAL_MAX_PREFIX	(SMC_CLC_MAX_V6_PREFIX * \
-					 sizeof(struct smc_clc_ipv6_prefix))
-#define SMC_CLC_MAX_LEN		(sizeof(struct smc_clc_msg_proposal) + \
-				 SMC_CLC_PROPOSAL_MAX_OFFSET + \
-				 sizeof(struct smc_clc_msg_proposal_prefix) + \
-				 SMC_CLC_PROPOSAL_MAX_PREFIX + \
-				 sizeof(struct smc_clc_msg_trail))
+struct smc_clc_msg_proposal_area {
+	struct smc_clc_msg_proposal		pclc_base;
+	struct smc_clc_msg_smcd			pclc_smcd;
+	struct smc_clc_msg_proposal_prefix	pclc_prfx;
+	struct smc_clc_ipv6_prefix	pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX];
+	struct smc_clc_msg_trail		pclc_trl;
+};
 
-struct smc_clc_msg_accept_confirm {	/* clc accept / confirm message */
-	struct smc_clc_msg_hdr hdr;
-	union {
-		struct { /* SMC-R */
+struct smcr_clc_msg_accept_confirm {	/* SMCR accept/confirm */
 	struct smc_clc_msg_local lcl;
 	u8 qpn[3];			/* QP number */
 	__be32 rmb_rkey;		/* RMB rkey */
 	u8 rmbe_idx;			/* Index of RMBE in RMB */
-			__be32 rmbe_alert_token;/* unique connection id */
-#if defined(__BIG_ENDIAN_BITFIELD)
+	__be32 rmbe_alert_token;	/* unique connection id */
+ #if defined(__BIG_ENDIAN_BITFIELD)
 	u8 rmbe_size : 4,		/* buf size (compressed) */
 	   qp_mtu   : 4;		/* QP mtu */
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
@@ -142,8 +136,9 @@ struct smc_clc_msg_accept_confirm {	/* clc accept / confirm message */
 	u8 psn[3];		/* packet sequence number */
 	struct smc_clc_msg_trail smcr_trl;
 				/* eye catcher "SMCR" EBCDIC */
-		} __packed;
-		struct { /* SMC-D */
+} __packed;
+
+struct smcd_clc_msg_accept_confirm {	/* SMCD accept/confirm */
 	u64 gid;		/* Sender GID */
 	u64 token;		/* DMB token */
 	u8 dmbe_idx;		/* DMBE index */
@@ -159,7 +154,13 @@ struct smc_clc_msg_accept_confirm {	/* clc accept / confirm message */
 	u32 reserved5[3];
 	struct smc_clc_msg_trail smcd_trl;
 				/* eye catcher "SMCD" EBCDIC */
-		} __packed;
+} __packed;
+
+struct smc_clc_msg_accept_confirm {	/* clc accept / confirm message */
+	struct smc_clc_msg_hdr hdr;
+	union {
+		struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
+		struct smcd_clc_msg_accept_confirm d0; /* SMC-D */
 	};
 } __packed;			/* format defined in RFC7609 */
 
@@ -200,6 +201,6 @@ int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info);
 int smc_clc_send_proposal(struct smc_sock *smc, int smc_type,
 			  struct smc_init_info *ini);
 int smc_clc_send_confirm(struct smc_sock *smc);
-int smc_clc_send_accept(struct smc_sock *smc, int srv_first_contact);
+int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact);
 
 #endif

net/smc/smc_close.c

@@ -208,12 +208,11 @@ int smc_close_active(struct smc_sock *smc)
 		break;
 	case SMC_LISTEN:
 		sk->sk_state = SMC_CLOSED;
+		smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
+		smc->clcsock->sk->sk_user_data = NULL;
 		sk->sk_state_change(sk); /* wake up accept */
-		if (smc->clcsock && smc->clcsock->sk) {
+		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);

net/smc/smc_core.c

@@ -34,7 +34,6 @@
 #define SMC_LGR_NUM_INCR		256
 #define SMC_LGR_FREE_DELAY_SERV		(600 * HZ)
 #define SMC_LGR_FREE_DELAY_CLNT		(SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
-#define SMC_LGR_FREE_DELAY_FAST		(8 * HZ)
 
 static struct smc_lgr_list smc_lgr_list = {	/* established link groups */
 	.lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
@@ -70,7 +69,7 @@ static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
 	 * creation. For client use a somewhat higher removal delay time,
 	 * otherwise there is a risk of out-of-sync link groups.
 	 */
-	if (!lgr->freeing && !lgr->freefast) {
+	if (!lgr->freeing) {
 		mod_delayed_work(system_wq, &lgr->free_work,
 				 (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
 						SMC_LGR_FREE_DELAY_CLNT :
@@ -78,15 +77,6 @@ static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
 	}
 }
 
-void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr)
-{
-	if (!lgr->freeing && !lgr->freefast) {
-		lgr->freefast = 1;
-		mod_delayed_work(system_wq, &lgr->free_work,
-				 SMC_LGR_FREE_DELAY_FAST);
-	}
-}
-
 /* Register connection's alert token in our lookup structure.
  * To use rbtrees we have to implement our own insert core.
  * Requires @conns_lock
@@ -227,7 +217,7 @@ void smc_lgr_cleanup_early(struct smc_connection *conn)
 	if (!list_empty(lgr_list))
 		list_del_init(lgr_list);
 	spin_unlock_bh(lgr_lock);
-	smc_lgr_schedule_free_work_fast(lgr);
+	__smc_lgr_terminate(lgr, true);
 }
 
 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
@@ -396,10 +386,15 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 		rc = SMC_CLC_DECL_MEM;
 		goto ism_put_vlan;
 	}
+	lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
+				     SMC_LGR_ID_SIZE, &lgr->id);
+	if (!lgr->tx_wq) {
+		rc = -ENOMEM;
+		goto free_lgr;
+	}
 	lgr->is_smcd = ini->is_smcd;
 	lgr->sync_err = 0;
 	lgr->terminating = 0;
-	lgr->freefast = 0;
 	lgr->freeing = 0;
 	lgr->vlan_id = ini->vlan_id;
 	mutex_init(&lgr->sndbufs_lock);
@@ -418,7 +413,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 	if (ini->is_smcd) {
 		/* SMC-D specific settings */
 		get_device(&ini->ism_dev->dev);
-		lgr->peer_gid = ini->ism_gid;
+		lgr->peer_gid = ini->ism_peer_gid;
 		lgr->smcd = ini->ism_dev;
 		lgr_list = &ini->ism_dev->lgr_list;
 		lgr_lock = &lgr->smcd->lgr_lock;
@@ -437,7 +432,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 		lnk = &lgr->lnk[link_idx];
 		rc = smcr_link_init(lgr, lnk, link_idx, ini);
 		if (rc)
-			goto free_lgr;
+			goto free_wq;
 		lgr_list = &smc_lgr_list.list;
 		lgr_lock = &smc_lgr_list.lock;
 		atomic_inc(&lgr_cnt);
@@ -448,6 +443,8 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 	spin_unlock_bh(lgr_lock);
 	return 0;
 
+free_wq:
+	destroy_workqueue(lgr->tx_wq);
 free_lgr:
 	kfree(lgr);
 ism_put_vlan:
@@ -517,7 +514,7 @@ static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
 	    smc->sk.sk_state != SMC_CLOSED) {
 		rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
 		if (!rc) {
-			schedule_delayed_work(&conn->tx_work, 0);
+			queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
 			smc->sk.sk_data_ready(&smc->sk);
 		}
 	} else {
@@ -824,11 +821,10 @@ static void smc_lgr_free(struct smc_link_group *lgr)
 	}
 
 	smc_lgr_free_bufs(lgr);
+	destroy_workqueue(lgr->tx_wq);
 	if (lgr->is_smcd) {
-		if (!lgr->terminating) {
 		smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
 		put_device(&lgr->smcd->dev);
-		}
 		if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
 			wake_up(&lgr->smcd->lgrs_deleted);
 	} else {
@@ -889,8 +885,6 @@ static void smc_lgr_cleanup(struct smc_link_group *lgr)
 	if (lgr->is_smcd) {
 		smc_ism_signal_shutdown(lgr);
 		smcd_unregister_all_dmbs(lgr);
-		smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
-		put_device(&lgr->smcd->dev);
 	} else {
 		u32 rsn = lgr->llc_termination_rsn;
 
@@ -1296,9 +1290,9 @@ int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
 
 	lgr_list = ini->is_smcd ? &ini->ism_dev->lgr_list : &smc_lgr_list.list;
 	lgr_lock = ini->is_smcd ? &ini->ism_dev->lgr_lock : &smc_lgr_list.lock;
-	ini->cln_first_contact = SMC_FIRST_CONTACT;
+	ini->first_contact_local = 1;
 	role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
-	if (role == SMC_CLNT && ini->srv_first_contact)
+	if (role == SMC_CLNT && ini->first_contact_peer)
 		/* create new link group as well */
 		goto create;
 
@@ -1307,14 +1301,14 @@ int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
 	list_for_each_entry(lgr, lgr_list, list) {
 		write_lock_bh(&lgr->conns_lock);
 		if ((ini->is_smcd ?
-		     smcd_lgr_match(lgr, ini->ism_dev, ini->ism_gid) :
+		     smcd_lgr_match(lgr, ini->ism_dev, ini->ism_peer_gid) :
 		     smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
 		    !lgr->sync_err &&
 		    lgr->vlan_id == ini->vlan_id &&
 		    (role == SMC_CLNT || ini->is_smcd ||
 		     lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
 			/* link group found */
-			ini->cln_first_contact = SMC_REUSE_CONTACT;
+			ini->first_contact_local = 0;
 			conn->lgr = lgr;
 			rc = smc_lgr_register_conn(conn, false);
 			write_unlock_bh(&lgr->conns_lock);
@@ -1328,8 +1322,8 @@ int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
 	if (rc)
 		return rc;
 
-	if (role == SMC_CLNT && !ini->srv_first_contact &&
-	    ini->cln_first_contact == SMC_FIRST_CONTACT) {
+	if (role == SMC_CLNT && !ini->first_contact_peer &&
+	    ini->first_contact_local) {
 		/* Server reuses a link group, but Client wants to start
 		 * a new one
 		 * send out_of_sync decline, reason synchr. error
@@ -1338,7 +1332,7 @@ int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
 	}
 
 create:
-	if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
+	if (ini->first_contact_local) {
 		rc = smc_lgr_create(smc, ini);
 		if (rc)
 			goto out;
@@ -1892,8 +1886,8 @@ int smc_rmb_rtoken_handling(struct smc_connection *conn,
 			    struct smc_link *lnk,
 			    struct smc_clc_msg_accept_confirm *clc)
 {
-	conn->rtoken_idx = smc_rtoken_add(lnk, clc->rmb_dma_addr,
-					  clc->rmb_rkey);
+	conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
+					  clc->r0.rmb_rkey);
 	if (conn->rtoken_idx < 0)
 		return conn->rtoken_idx;
 	return 0;

net/smc/smc_core.h

@@ -137,9 +137,6 @@ struct smc_link {
 #define SMC_LINKS_PER_LGR_MAX	3
 #define SMC_SINGLE_LINK		0
 
-#define SMC_FIRST_CONTACT	1		/* first contact to a peer */
-#define SMC_REUSE_CONTACT	0		/* follow-on contact to a peer*/
-
 /* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */
 struct smc_buf_desc {
 	struct list_head	list;
@@ -228,9 +225,9 @@ struct smc_link_group {
 	u8			id[SMC_LGR_ID_SIZE];	/* unique lgr id */
 	struct delayed_work	free_work;	/* delayed freeing of an lgr */
 	struct work_struct	terminate_work;	/* abnormal lgr termination */
+	struct workqueue_struct	*tx_wq;		/* wq for conn. tx workers */
 	u8			sync_err : 1;	/* lgr no longer fits to peer */
 	u8			terminating : 1;/* lgr is terminating */
-	u8			freefast : 1;	/* free worker scheduled fast */
 	u8			freeing : 1;	/* lgr is being freed */
 
 	bool			is_smcd;	/* SMC-R or SMC-D */
@@ -294,9 +291,9 @@ struct smc_clc_msg_local;
 
 struct smc_init_info {
 	u8			is_smcd;
+	u8			first_contact_peer;
+	u8			first_contact_local;
 	unsigned short		vlan_id;
-	int			srv_first_contact;
-	int			cln_first_contact;
 	/* SMC-R */
 	struct smc_clc_msg_local *ib_lcl;
 	struct smc_ib_device	*ib_dev;
@@ -304,7 +301,7 @@ struct smc_init_info {
 	u8			ib_port;
 	u32			ib_clcqpn;
 	/* SMC-D */
-	u64			ism_gid;
+	u64			ism_peer_gid;
 	struct smcd_dev		*ism_dev;
 };
 

net/smc/smc_diag.c

@@ -22,6 +22,15 @@
 #include "smc.h"
 #include "smc_core.h"
 
+struct smc_diag_dump_ctx {
+	int pos[2];
+};
+
+static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)
+{
+	return (struct smc_diag_dump_ctx *)cb->ctx;
+}
+
 static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
 {
 	sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
@@ -193,13 +202,15 @@ static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
 }
 
 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
-			       struct netlink_callback *cb)
+			       struct netlink_callback *cb, int p_type)
 {
+	struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
 	struct net *net = sock_net(skb->sk);
+	int snum = cb_ctx->pos[p_type];
 	struct nlattr *bc = NULL;
 	struct hlist_head *head;
+	int rc = 0, num = 0;
 	struct sock *sk;
-	int rc = 0;
 
 	read_lock(&prot->h.smc_hash->lock);
 	head = &prot->h.smc_hash->ht;
@@ -209,13 +220,18 @@ static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
 	sk_for_each(sk, head) {
 		if (!net_eq(sock_net(sk), net))
 			continue;
+		if (num < snum)
+			goto next;
 		rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
-		if (rc)
-			break;
+		if (rc < 0)
+			goto out;
+next:
+		num++;
 	}
 
 out:
 	read_unlock(&prot->h.smc_hash->lock);
+	cb_ctx->pos[p_type] = num;
 	return rc;
 }
 
@@ -223,10 +239,10 @@ static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	int rc = 0;
 
-	rc = smc_diag_dump_proto(&smc_proto, skb, cb);
+	rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC);
 	if (!rc)
-		rc = smc_diag_dump_proto(&smc_proto6, skb, cb);
-	return rc;
+		smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6);
+	return skb->len;
 }
 
 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)

net/smc/smc_llc.c

@@ -1691,7 +1691,7 @@ static void smc_llc_enqueue(struct smc_link *link, union smc_llc_msg *llc)
 	spin_lock_irqsave(&lgr->llc_event_q_lock, flags);
 	list_add_tail(&qentry->list, &lgr->llc_event_q);
 	spin_unlock_irqrestore(&lgr->llc_event_q_lock, flags);
-	schedule_work(&lgr->llc_event_work);
+	queue_work(system_highpri_wq, &lgr->llc_event_work);
 }
 
 /* copy received msg and add it to the event queue */

net/smc/smc_pnet.c

@@ -928,7 +928,10 @@ static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
 	mutex_lock(&smcd_dev_list.mutex);
 	list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
 		if (smc_pnet_match(ismdev->pnetid, ndev_pnetid) &&
-		    !ismdev->going_away) {
+		    !ismdev->going_away &&
+		    (!ini->ism_peer_gid ||
+		     !smc_ism_cantalk(ini->ism_peer_gid, ini->vlan_id,
+				      ismdev))) {
 			ini->ism_dev = ismdev;
 			break;
 		}

net/smc/smc_tx.c

@@ -228,7 +228,7 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 			/* for a corked socket defer the RDMA writes if there
 			 * is still sufficient sndbuf_space available
 			 */
-			schedule_delayed_work(&conn->tx_work,
+			queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work,
 					   SMC_TX_CORK_DELAY);
 		else
 			smc_tx_sndbuf_nonempty(conn);
@@ -499,7 +499,7 @@ static int smcr_tx_sndbuf_nonempty(struct smc_connection *conn)
 			if (conn->killed)
 				return -EPIPE;
 			rc = 0;
-			mod_delayed_work(system_wq, &conn->tx_work,
+			mod_delayed_work(conn->lgr->tx_wq, &conn->tx_work,
 					 SMC_TX_WORK_DELAY);
 		}
 		return rc;
@@ -623,7 +623,7 @@ void smc_tx_consumer_update(struct smc_connection *conn, bool force)
 			return;
 		if ((smc_cdc_get_slot_and_msg_send(conn) < 0) &&
 		    !conn->killed) {
-			schedule_delayed_work(&conn->tx_work,
+			queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work,
 					   SMC_TX_WORK_DELAY);
 			return;
 		}