Merge branch 'smc-next'

Ursula Braun says:

====================
net/smc: patches 2018-07-23

here are some small patches for SMC: Just the first patch contains a
functional change. It allows to differ between the modes SMCR and SMCD
on s390 when monitoring SMC sockets. The remaining patches are cleanups
without functional changes.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 84 insertions, 155 deletions

diff --git a/include/uapi/linux/smc_diag.h b/include/uapi/linux/smc_diag.h
index 92be255e534c..48ae3ee22b2d 100644
--- a/include/uapi/linux/smc_diag.h
+++ b/include/uapi/linux/smc_diag.h
@@ -20,7 +20,7 @@ struct smc_diag_req {
 struct smc_diag_msg {
 	__u8	diag_family;
 	__u8	diag_state;
-	__u8	diag_fallback;
+	__u8	diag_mode;
 	__u8	diag_shutdown;
 	struct inet_diag_sockid id;
 
@@ -28,6 +28,13 @@ struct smc_diag_msg {
 	__u64	diag_inode;
 };
 
+/* Mode of a connection */
+enum {
+	SMC_DIAG_MODE_SMCR,
+	SMC_DIAG_MODE_FALLBACK_TCP,
+	SMC_DIAG_MODE_SMCD,
+};
+
 /* Extensions */
 
 enum {
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 143b2220c0c8..7fc810ec31c5 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1755,12 +1755,8 @@ static int smc_ioctl(struct socket *sock, unsigned int cmd,
 		    smc->sk.sk_state == SMC_CLOSED) {
 			answ = 0;
 		} else {
-			smc_curs_write(&cons,
-			       smc_curs_read(&conn->local_tx_ctrl.cons, conn),
-				       conn);
-			smc_curs_write(&urg,
-				       smc_curs_read(&conn->urg_curs, conn),
-				       conn);
+			smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
+			smc_curs_copy(&urg, &conn->urg_curs, conn);
 			answ = smc_curs_diff(conn->rmb_desc->len,
 					     &cons, &urg) == 1;
 		}
diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
index 621d8cca570b..a7af2289cdff 100644
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -34,14 +34,15 @@ static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd,
 			       enum ib_wc_status wc_status)
 {
 	struct smc_cdc_tx_pend *cdcpend = (struct smc_cdc_tx_pend *)pnd_snd;
+	struct smc_connection *conn = cdcpend->conn;
 	struct smc_sock *smc;
 	int diff;
 
-	if (!cdcpend->conn)
+	if (!conn)
 		/* already dismissed */
 		return;
 
-	smc = container_of(cdcpend->conn, struct smc_sock, conn);
+	smc = container_of(conn, struct smc_sock, conn);
 	bh_lock_sock(&smc->sk);
 	if (!wc_status) {
 		diff = smc_curs_diff(cdcpend->conn->sndbuf_desc->len,
@@ -52,9 +53,7 @@ static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd,
 		atomic_add(diff, &cdcpend->conn->sndbuf_space);
 		/* guarantee 0 <= sndbuf_space <= sndbuf_desc->len */
 		smp_mb__after_atomic();
-		smc_curs_write(&cdcpend->conn->tx_curs_fin,
-			       smc_curs_read(&cdcpend->cursor, cdcpend->conn),
-			       cdcpend->conn);
+		smc_curs_copy(&conn->tx_curs_fin, &cdcpend->cursor, conn);
 	}
 	smc_tx_sndbuf_nonfull(smc);
 	bh_unlock_sock(&smc->sk);
@@ -110,9 +109,8 @@ int smc_cdc_msg_send(struct smc_connection *conn,
 			    &conn->local_tx_ctrl, conn);
 	rc = smc_wr_tx_send(link, (struct smc_wr_tx_pend_priv *)pend);
 	if (!rc)
-		smc_curs_write(&conn->rx_curs_confirmed,
-			       smc_curs_read(&conn->local_tx_ctrl.cons, conn),
-			       conn);
+		smc_curs_copy(&conn->rx_curs_confirmed,
+			      &conn->local_tx_ctrl.cons, conn);
 
 	return rc;
 }
@@ -194,8 +192,8 @@ int smcd_cdc_msg_send(struct smc_connection *conn)
 	rc = smcd_tx_ism_write(conn, &cdc, sizeof(cdc), 0, 1);
 	if (rc)
 		return rc;
-	smc_curs_write(&conn->rx_curs_confirmed,
-		       smc_curs_read(&conn->local_tx_ctrl.cons, conn), conn);
+	smc_curs_copy(&conn->rx_curs_confirmed, &conn->local_tx_ctrl.cons,
+		      conn);
 	/* Calculate transmitted data and increment free send buffer space */
 	diff = smc_curs_diff(conn->sndbuf_desc->len, &conn->tx_curs_fin,
 			     &conn->tx_curs_sent);
@@ -204,8 +202,7 @@ int smcd_cdc_msg_send(struct smc_connection *conn)
 	atomic_add(diff, &conn->sndbuf_space);
 	/* guarantee 0 <= sndbuf_space <= sndbuf_desc->len */
 	smp_mb__after_atomic();
-	smc_curs_write(&conn->tx_curs_fin,
-		       smc_curs_read(&conn->tx_curs_sent, conn), conn);
+	smc_curs_copy(&conn->tx_curs_fin, &conn->tx_curs_sent, conn);
 
 	smc_tx_sndbuf_nonfull(smc);
 	return rc;
@@ -225,9 +222,7 @@ static void smc_cdc_handle_urg_data_arrival(struct smc_sock *smc,
 	char *base;
 
 	/* new data included urgent business */
-	smc_curs_write(&conn->urg_curs,
-		       smc_curs_read(&conn->local_rx_ctrl.prod, conn),
-		       conn);
+	smc_curs_copy(&conn->urg_curs, &conn->local_rx_ctrl.prod, conn);
 	conn->urg_state = SMC_URG_VALID;
 	if (!sock_flag(&smc->sk, SOCK_URGINLINE))
 		/* we'll skip the urgent byte, so don't account for it */
@@ -247,12 +242,8 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc,
 	struct smc_connection *conn = &smc->conn;
 	int diff_cons, diff_prod;
 
-	smc_curs_write(&prod_old,
-		       smc_curs_read(&conn->local_rx_ctrl.prod, conn),
-		       conn);
-	smc_curs_write(&cons_old,
-		       smc_curs_read(&conn->local_rx_ctrl.cons, conn),
-		       conn);
+	smc_curs_copy(&prod_old, &conn->local_rx_ctrl.prod, conn);
+	smc_curs_copy(&cons_old, &conn->local_rx_ctrl.cons, conn);
 	smc_cdc_msg_to_host(&conn->local_rx_ctrl, cdc, conn);
 
 	diff_cons = smc_curs_diff(conn->peer_rmbe_size, &cons_old,
@@ -374,7 +365,7 @@ static void smc_cdc_rx_handler(struct ib_wc *wc, void *buf)
 		return; /* invalid message */
 
 	/* lookup connection */
-	lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
+	lgr = smc_get_lgr(link);
 	read_lock_bh(&lgr->conns_lock);
 	conn = smc_lgr_find_conn(ntohl(cdc->token), lgr);
 	read_unlock_bh(&lgr->conns_lock);
diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h
index 8fbce4fee3e4..934df4473a7c 100644
--- a/net/smc/smc_cdc.h
+++ b/net/smc/smc_cdc.h
@@ -104,47 +104,34 @@ static inline u64 smc_curs_read(union smc_host_cursor *curs,
 #endif
 }
 
-static inline u64 smc_curs_read_net(union smc_cdc_cursor *curs,
-				    struct smc_connection *conn)
-{
-#ifndef KERNEL_HAS_ATOMIC64
-	unsigned long flags;
-	u64 ret;
-
-	spin_lock_irqsave(&conn->acurs_lock, flags);
-	ret = curs->acurs;
-	spin_unlock_irqrestore(&conn->acurs_lock, flags);
-	return ret;
-#else
-	return atomic64_read(&curs->acurs);
-#endif
-}
-
-static inline void smc_curs_write(union smc_host_cursor *curs, u64 val,
-				  struct smc_connection *conn)
+/* Copy cursor src into tgt */
+static inline void smc_curs_copy(union smc_host_cursor *tgt,
+				 union smc_host_cursor *src,
+				 struct smc_connection *conn)
 {
 #ifndef KERNEL_HAS_ATOMIC64
 	unsigned long flags;
 
 	spin_lock_irqsave(&conn->acurs_lock, flags);
-	curs->acurs = val;
+	tgt->acurs = src->acurs;
 	spin_unlock_irqrestore(&conn->acurs_lock, flags);
 #else
-	atomic64_set(&curs->acurs, val);
+	atomic64_set(&tgt->acurs, atomic64_read(&src->acurs));
 #endif
 }
 
-static inline void smc_curs_write_net(union smc_cdc_cursor *curs, u64 val,
-				      struct smc_connection *conn)
+static inline void smc_curs_copy_net(union smc_cdc_cursor *tgt,
+				     union smc_cdc_cursor *src,
+				     struct smc_connection *conn)
 {
 #ifndef KERNEL_HAS_ATOMIC64
 	unsigned long flags;
 
 	spin_lock_irqsave(&conn->acurs_lock, flags);
-	curs->acurs = val;
+	tgt->acurs = src->acurs;
 	spin_unlock_irqrestore(&conn->acurs_lock, flags);
 #else
-	atomic64_set(&curs->acurs, val);
+	atomic64_set(&tgt->acurs, atomic64_read(&src->acurs));
 #endif
 }
 
@@ -179,7 +166,7 @@ static inline void smc_host_cursor_to_cdc(union smc_cdc_cursor *peer,
 {
 	union smc_host_cursor temp;
 
-	smc_curs_write(&temp, smc_curs_read(local, conn), conn);
+	smc_curs_copy(&temp, local, conn);
 	peer->count = htonl(temp.count);
 	peer->wrap = htons(temp.wrap);
 	/* peer->reserved = htons(0); must be ensured by caller */
@@ -206,8 +193,8 @@ static inline void smc_cdc_cursor_to_host(union smc_host_cursor *local,
 	union smc_host_cursor temp, old;
 	union smc_cdc_cursor net;
 
-	smc_curs_write(&old, smc_curs_read(local, conn), conn);
-	smc_curs_write_net(&net, smc_curs_read_net(peer, conn), conn);
+	smc_curs_copy(&old, local, conn);
+	smc_curs_copy_net(&net, peer, conn);
 	temp.count = ntohl(net.count);
 	temp.wrap = ntohs(net.wrap);
 	if ((old.wrap > temp.wrap) && temp.wrap)
@@ -215,7 +202,7 @@ static inline void smc_cdc_cursor_to_host(union smc_host_cursor *local,
 	if ((old.wrap == temp.wrap) &&
 	    (old.count > temp.count))
 		return;
-	smc_curs_write(local, smc_curs_read(&temp, conn), conn);
+	smc_curs_copy(local, &temp, conn);
 }
 
 static inline void smcr_cdc_msg_to_host(struct smc_host_cdc_msg *local,
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index 8b47e0168fc3..1e8974c50550 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -192,8 +192,7 @@ struct smc_link_group {
 			struct smc_rtoken	rtokens[SMC_RMBS_PER_LGR_MAX]
 						[SMC_LINKS_PER_LGR_MAX];
 						/* remote addr/key pairs */
-			unsigned long		rtokens_used_mask[BITS_TO_LONGS
-							(SMC_RMBS_PER_LGR_MAX)];
+			DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX);
 						/* used rtoken elements */
 		};
 		struct { /* SMC-D */
@@ -266,4 +265,9 @@ int smc_conn_create(struct smc_sock *smc, bool is_smcd, int srv_first_contact,
 		    u64 peer_gid);
 void smcd_conn_free(struct smc_connection *conn);
 void smc_core_exit(void);
+
+static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
+{
+	return container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
+}
 #endif
diff --git a/net/smc/smc_diag.c b/net/smc/smc_diag.c
index 6d83eef1b743..d772cd10297e 100644
--- a/net/smc/smc_diag.c
+++ b/net/smc/smc_diag.c
@@ -91,7 +91,12 @@ static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
 	r = nlmsg_data(nlh);
 	smc_diag_msg_common_fill(r, sk);
 	r->diag_state = sk->sk_state;
-	r->diag_fallback = smc->use_fallback;
+	if (smc->use_fallback)
+		r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
+	else if (smc->conn.lgr && smc->conn.lgr->is_smcd)
+		r->diag_mode = SMC_DIAG_MODE_SMCD;
+	else
+		r->diag_mode = SMC_DIAG_MODE_SMCR;
 	user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
 	if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
 		goto errout;
diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
index 36de2fd76170..4706ab7092a9 100644
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -112,8 +112,7 @@ int smc_ib_modify_qp_reset(struct smc_link *lnk)
 
 int smc_ib_ready_link(struct smc_link *lnk)
 {
-	struct smc_link_group *lgr =
-		container_of(lnk, struct smc_link_group, lnk[0]);
+	struct smc_link_group *lgr = smc_get_lgr(lnk);
 	int rc = 0;
 
 	rc = smc_ib_modify_qp_init(lnk);
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index 5800a6b43d83..b7944aa1ffc3 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -186,8 +186,7 @@ int smc_llc_send_confirm_link(struct smc_link *link, u8 mac[],
 			      union ib_gid *gid,
 			      enum smc_llc_reqresp reqresp)
 {
-	struct smc_link_group *lgr = container_of(link, struct smc_link_group,
-						  lnk[SMC_SINGLE_LINK]);
+	struct smc_link_group *lgr = smc_get_lgr(link);
 	struct smc_llc_msg_confirm_link *confllc;
 	struct smc_wr_tx_pend_priv *pend;
 	struct smc_wr_buf *wr_buf;
@@ -381,11 +380,9 @@ static int smc_llc_send_message(struct smc_link *link, void *llcbuf, int llclen)
 static void smc_llc_rx_confirm_link(struct smc_link *link,
 				    struct smc_llc_msg_confirm_link *llc)
 {
-	struct smc_link_group *lgr;
+	struct smc_link_group *lgr = smc_get_lgr(link);
 	int conf_rc;
 
-	lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
-
 	/* RMBE eyecatchers are not supported */
 	if (llc->hd.flags & SMC_LLC_FLAG_NO_RMBE_EYEC)
 		conf_rc = 0;
@@ -411,8 +408,7 @@ static void smc_llc_rx_confirm_link(struct smc_link *link,
 static void smc_llc_rx_add_link(struct smc_link *link,
 				struct smc_llc_msg_add_link *llc)
 {
-	struct smc_link_group *lgr = container_of(link, struct smc_link_group,
-						  lnk[SMC_SINGLE_LINK]);
+	struct smc_link_group *lgr = smc_get_lgr(link);
 
 	if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
 		if (link->state == SMC_LNK_ACTIVATING)
@@ -442,8 +438,7 @@ static void smc_llc_rx_add_link(struct smc_link *link,
 static void smc_llc_rx_delete_link(struct smc_link *link,
 				   struct smc_llc_msg_del_link *llc)
 {
-	struct smc_link_group *lgr = container_of(link, struct smc_link_group,
-						  lnk[SMC_SINGLE_LINK]);
+	struct smc_link_group *lgr = smc_get_lgr(link);
 
 	if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
 		if (lgr->role == SMC_SERV)
@@ -476,17 +471,14 @@ static void smc_llc_rx_test_link(struct smc_link *link,
 static void smc_llc_rx_confirm_rkey(struct smc_link *link,
 				    struct smc_llc_msg_confirm_rkey *llc)
 {
-	struct smc_link_group *lgr;
 	int rc;
 
-	lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
-
 	if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
 		link->llc_confirm_rkey_rc = llc->hd.flags &
 					    SMC_LLC_FLAG_RKEY_NEG;
 		complete(&link->llc_confirm_rkey);
 	} else {
-		rc = smc_rtoken_add(lgr,
+		rc = smc_rtoken_add(smc_get_lgr(link),
 				    llc->rtoken[0].rmb_vaddr,
 				    llc->rtoken[0].rmb_key);
 
@@ -514,18 +506,15 @@ static void smc_llc_rx_confirm_rkey_cont(struct smc_link *link,
 static void smc_llc_rx_delete_rkey(struct smc_link *link,
 				   struct smc_llc_msg_delete_rkey *llc)
 {
-	struct smc_link_group *lgr;
 	u8 err_mask = 0;
 	int i, max;
 
-	lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
-
 	if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
 		/* unused as long as we don't send this type of msg */
 	} else {
 		max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX);
 		for (i = 0; i < max; i++) {
-			if (smc_rtoken_delete(lgr, llc->rkey[i]))
+			if (smc_rtoken_delete(smc_get_lgr(link), llc->rkey[i]))
 				err_mask |= 1 << (SMC_LLC_DEL_RKEY_MAX - 1 - i);
 		}
 
@@ -583,12 +572,10 @@ static void smc_llc_testlink_work(struct work_struct *work)
 	struct smc_link *link = container_of(to_delayed_work(work),
 					     struct smc_link, llc_testlink_wrk);
 	unsigned long next_interval;
-	struct smc_link_group *lgr;
 	unsigned long expire_time;
 	u8 user_data[16] = { 0 };
 	int rc;
 
-	lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
 	if (link->state != SMC_LNK_ACTIVE)
 		return;		/* don't reschedule worker */
 	expire_time = link->wr_rx_tstamp + link->llc_testlink_time;
@@ -602,7 +589,7 @@ static void smc_llc_testlink_work(struct work_struct *work)
 	rc = wait_for_completion_interruptible_timeout(&link->llc_testlink_resp,
 						       SMC_LLC_WAIT_TIME);
 	if (rc <= 0) {
-		smc_lgr_terminate(lgr);
+		smc_lgr_terminate(smc_get_lgr(link));
 		return;
 	}
 	next_interval = link->llc_testlink_time;
@@ -613,8 +600,7 @@ out:
 
 int smc_llc_link_init(struct smc_link *link)
 {
-	struct smc_link_group *lgr = container_of(link, struct smc_link_group,
-						  lnk[SMC_SINGLE_LINK]);
+	struct smc_link_group *lgr = smc_get_lgr(link);
 	link->llc_wq = alloc_ordered_workqueue("llc_wq-%x:%x)", WQ_MEM_RECLAIM,
 					       *((u32 *)lgr->id),
 					       link->link_id);
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index b329803c8339..bbcf0fe4ae10 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -82,8 +82,7 @@ static int smc_rx_update_consumer(struct smc_sock *smc,
 		}
 	}
 
-	smc_curs_write(&conn->local_tx_ctrl.cons, smc_curs_read(&cons, conn),
-		       conn);
+	smc_curs_copy(&conn->local_tx_ctrl.cons, &cons, conn);
 
 	/* send consumer cursor update if required */
 	/* similar to advertising new TCP rcv_wnd if required */
@@ -97,8 +96,7 @@ static void smc_rx_update_cons(struct smc_sock *smc, size_t len)
 	struct smc_connection *conn = &smc->conn;
 	union smc_host_cursor cons;
 
-	smc_curs_write(&cons, smc_curs_read(&conn->local_tx_ctrl.cons, conn),
-		       conn);
+	smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
 	smc_rx_update_consumer(smc, cons, len);
 }
 
@@ -157,10 +155,8 @@ static int smc_rx_splice(struct pipe_inode_info *pipe, char *src, size_t len,
 	struct splice_pipe_desc spd;
 	struct partial_page partial;
 	struct smc_spd_priv *priv;
-	struct page *page;
 	int bytes;
 
-	page = virt_to_page(smc->conn.rmb_desc->cpu_addr);
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
@@ -172,7 +168,7 @@ static int smc_rx_splice(struct pipe_inode_info *pipe, char *src, size_t len,
 
 	spd.nr_pages_max = 1;
 	spd.nr_pages = 1;
-	spd.pages = &page;
+	spd.pages = &smc->conn.rmb_desc->pages;
 	spd.partial = &partial;
 	spd.ops = &smc_pipe_ops;
 	spd.spd_release = smc_rx_spd_release;
@@ -245,10 +241,7 @@ static int smc_rx_recv_urg(struct smc_sock *smc, struct msghdr *msg, int len,
 			if (!(flags & MSG_TRUNC))
 				rc = memcpy_to_msg(msg, &conn->urg_rx_byte, 1);
 			len = 1;
-			smc_curs_write(&cons,
-				       smc_curs_read(&conn->local_tx_ctrl.cons,
-						     conn),
-				       conn);
+			smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
 			if (smc_curs_diff(conn->rmb_desc->len, &cons,
 					  &conn->urg_curs) > 1)
 				conn->urg_rx_skip_pend = true;
@@ -370,9 +363,7 @@ copy:
 			continue;
 		}
 
-		smc_curs_write(&cons,
-			       smc_curs_read(&conn->local_tx_ctrl.cons, conn),
-			       conn);
+		smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
 		/* subsequent splice() calls pick up where previous left */
 		if (splbytes)
 			smc_curs_add(conn->rmb_desc->len, &cons, splbytes);
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index 142bcb134dd6..2f5e324e54b9 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -181,9 +181,7 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 		copylen = min_t(size_t, send_remaining, writespace);
 		/* determine start of sndbuf */
 		sndbuf_base = conn->sndbuf_desc->cpu_addr;
-		smc_curs_write(&prep,
-			       smc_curs_read(&conn->tx_curs_prep, conn),
-			       conn);
+		smc_curs_copy(&prep, &conn->tx_curs_prep, conn);
 		tx_cnt_prep = prep.count;
 		/* determine chunks where to write into sndbuf */
 		/* either unwrapped case, or 1st chunk of wrapped case */
@@ -214,9 +212,7 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 		smc_sndbuf_sync_sg_for_device(conn);
 		/* update cursors */
 		smc_curs_add(conn->sndbuf_desc->len, &prep, copylen);
-		smc_curs_write(&conn->tx_curs_prep,
-			       smc_curs_read(&prep, conn),
-			       conn);
+		smc_curs_copy(&conn->tx_curs_prep, &prep, conn);
 		/* increased in send tasklet smc_cdc_tx_handler() */
 		smp_mb__before_atomic();
 		atomic_sub(copylen, &conn->sndbuf_space);
@@ -417,8 +413,8 @@ static int smc_tx_rdma_writes(struct smc_connection *conn)
 	int rc;
 
 	/* source: sndbuf */
-	smc_curs_write(&sent, smc_curs_read(&conn->tx_curs_sent, conn), conn);
-	smc_curs_write(&prep, smc_curs_read(&conn->tx_curs_prep, conn), conn);
+	smc_curs_copy(&sent, &conn->tx_curs_sent, conn);
+	smc_curs_copy(&prep, &conn->tx_curs_prep, conn);
 	/* cf. wmem_alloc - (snd_max - snd_una) */
 	to_send = smc_curs_diff(conn->sndbuf_desc->len, &sent, &prep);
 	if (to_send <= 0)
@@ -429,12 +425,8 @@ static int smc_tx_rdma_writes(struct smc_connection *conn)
 	rmbespace = atomic_read(&conn->peer_rmbe_space);
 	if (rmbespace <= 0)
 		return 0;
-	smc_curs_write(&prod,
-		       smc_curs_read(&conn->local_tx_ctrl.prod, conn),
-		       conn);
-	smc_curs_write(&cons,
-		       smc_curs_read(&conn->local_rx_ctrl.cons, conn),
-		       conn);
+	smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
+	smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
 
 	/* if usable snd_wnd closes ask peer to advertise once it opens again */
 	pflags = &conn->local_tx_ctrl.prod_flags;
@@ -481,14 +473,9 @@ static int smc_tx_rdma_writes(struct smc_connection *conn)
 		pflags->urg_data_present = 1;
 	smc_tx_advance_cursors(conn, &prod, &sent, len);
 	/* update connection's cursors with advanced local cursors */
-	smc_curs_write(&conn->local_tx_ctrl.prod,
-		       smc_curs_read(&prod, conn),
-		       conn);
+	smc_curs_copy(&conn->local_tx_ctrl.prod, &prod, conn);
 							/* dst: peer RMBE */
-	smc_curs_write(&conn->tx_curs_sent,
-		       smc_curs_read(&sent, conn),
-		       conn);
-							/* src: local sndbuf */
+	smc_curs_copy(&conn->tx_curs_sent, &sent, conn);/* src: local sndbuf */
 
 	return 0;
 }
@@ -606,17 +593,11 @@ void smc_tx_consumer_update(struct smc_connection *conn, bool force)
 	int sender_free = conn->rmb_desc->len;
 	int to_confirm;
 
-	smc_curs_write(&cons,
-		       smc_curs_read(&conn->local_tx_ctrl.cons, conn),
-		       conn);
-	smc_curs_write(&cfed,
-		       smc_curs_read(&conn->rx_curs_confirmed, conn),
-		       conn);
+	smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
+	smc_curs_copy(&cfed, &conn->rx_curs_confirmed, conn);
 	to_confirm = smc_curs_diff(conn->rmb_desc->len, &cfed, &cons);
 	if (to_confirm > conn->rmbe_update_limit) {
-		smc_curs_write(&prod,
-			       smc_curs_read(&conn->local_rx_ctrl.prod, conn),
-			       conn);
+		smc_curs_copy(&prod, &conn->local_rx_ctrl.prod, conn);
 		sender_free = conn->rmb_desc->len -
 			      smc_curs_diff(conn->rmb_desc->len, &prod, &cfed);
 	}
@@ -632,9 +613,8 @@ void smc_tx_consumer_update(struct smc_connection *conn, bool force)
 					      SMC_TX_WORK_DELAY);
 			return;
 		}
-		smc_curs_write(&conn->rx_curs_confirmed,
-			       smc_curs_read(&conn->local_tx_ctrl.cons, conn),
-			       conn);
+		smc_curs_copy(&conn->rx_curs_confirmed,
+			      &conn->local_tx_ctrl.cons, conn);
 		conn->local_rx_ctrl.prod_flags.cons_curs_upd_req = 0;
 	}
 	if (conn->local_rx_ctrl.prod_flags.write_blocked &&
diff --git a/net/smc/smc_tx.h b/net/smc/smc_tx.h
index b22bdc5694c4..07e6ad76224a 100644
--- a/net/smc/smc_tx.h
+++ b/net/smc/smc_tx.h
@@ -22,8 +22,8 @@ static inline int smc_tx_prepared_sends(struct smc_connection *conn)
 {
 	union smc_host_cursor sent, prep;
 
-	smc_curs_write(&sent, smc_curs_read(&conn->tx_curs_sent, conn), conn);
-	smc_curs_write(&prep, smc_curs_read(&conn->tx_curs_prep, conn), conn);
+	smc_curs_copy(&sent, &conn->tx_curs_sent, conn);
+	smc_curs_copy(&prep, &conn->tx_curs_prep, conn);
 	return smc_curs_diff(conn->sndbuf_desc->len, &sent, &prep);
 }
 
diff --git a/net/smc/smc_wr.c b/net/smc/smc_wr.c
index dbd2605d1962..b6df69756bef 100644
--- a/net/smc/smc_wr.c
+++ b/net/smc/smc_wr.c
@@ -92,8 +92,6 @@ static inline void smc_wr_tx_process_cqe(struct ib_wc *wc)
 	if (!test_and_clear_bit(pnd_snd_idx, link->wr_tx_mask))
 		return;
 	if (wc->status) {
-		struct smc_link_group *lgr;
-
 		for_each_set_bit(i, link->wr_tx_mask, link->wr_tx_cnt) {
 			/* clear full struct smc_wr_tx_pend including .priv */
 			memset(&link->wr_tx_pends[i], 0,
@@ -103,9 +101,7 @@ static inline void smc_wr_tx_process_cqe(struct ib_wc *wc)
 			clear_bit(i, link->wr_tx_mask);
 		}
 		/* terminate connections of this link group abnormally */
-		lgr = container_of(link, struct smc_link_group,
-				   lnk[SMC_SINGLE_LINK]);
-		smc_lgr_terminate(lgr);
+		smc_lgr_terminate(smc_get_lgr(link));
 	}
 	if (pnd_snd.handler)
 		pnd_snd.handler(&pnd_snd.priv, link, wc->status);
@@ -188,8 +184,7 @@ int smc_wr_tx_get_free_slot(struct smc_link *link,
 	} else {
 		struct smc_link_group *lgr;
 
-		lgr = container_of(link, struct smc_link_group,
-				   lnk[SMC_SINGLE_LINK]);
+		lgr = smc_get_lgr(link);
 		rc = wait_event_timeout(
 			link->wr_tx_wait,
 			list_empty(&lgr->list) || /* lgr terminated */
@@ -250,12 +245,8 @@ int smc_wr_tx_send(struct smc_link *link, struct smc_wr_tx_pend_priv *priv)
 	rc = ib_post_send(link->roce_qp, &link->wr_tx_ibs[pend->idx],
 			  &failed_wr);
 	if (rc) {
-		struct smc_link_group *lgr =
-			container_of(link, struct smc_link_group,
-				     lnk[SMC_SINGLE_LINK]);
-
 		smc_wr_tx_put_slot(link, priv);
-		smc_lgr_terminate(lgr);
+		smc_lgr_terminate(smc_get_lgr(link));
 	}
 	return rc;
 }
@@ -283,11 +274,7 @@ int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr)
 					      SMC_WR_REG_MR_WAIT_TIME);
 	if (!rc) {
 		/* timeout - terminate connections */
-		struct smc_link_group *lgr;
-
-		lgr = container_of(link, struct smc_link_group,
-				   lnk[SMC_SINGLE_LINK]);
-		smc_lgr_terminate(lgr);
+		smc_lgr_terminate(smc_get_lgr(link));
 		return -EPIPE;
 	}
 	if (rc == -ERESTARTSYS)
@@ -380,8 +367,6 @@ static inline void smc_wr_rx_process_cqes(struct ib_wc wc[], int num)
 			smc_wr_rx_demultiplex(&wc[i]);
 			smc_wr_rx_post(link); /* refill WR RX */
 		} else {
-			struct smc_link_group *lgr;
-
 			/* handle status errors */
 			switch (wc[i].status) {
 			case IB_WC_RETRY_EXC_ERR:
@@ -390,9 +375,7 @@ static inline void smc_wr_rx_process_cqes(struct ib_wc wc[], int num)
 				/* terminate connections of this link group
 				 * abnormally
 				 */
-				lgr = container_of(link, struct smc_link_group,
-						   lnk[SMC_SINGLE_LINK]);
-				smc_lgr_terminate(lgr);
+				smc_lgr_terminate(smc_get_lgr(link));
 				break;
 			default:
 				smc_wr_rx_post(link); /* refill WR RX */