[PATCH net-next v2 0/4] net/smc: Add SMC statistic support

[PATCH net-next v2 0/4] net/smc: Add SMC statistic support

[Karsten Graul]

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

This v2 is a resend of the code contained in v1 but with an updated
cover letter to describe why we have chosen to use the generic netlink
mechanism to access the smc protocol's statistic data.

The patchset adds statistic support to the SMC protocol. Per-cpu
variables are used to collect the statistic information for better
performance and for reducing concurrency pitfalls. The code that is
collecting statistic data is implemented in macros to increase code
reuse and readability.
The generic netlink mechanism in SMC is extended to provide the
collected statistics to userspace.
Network namespace awareness is also part of the statistics
implementation.

SMC is a protocol interacting with PCI devices (like RoCE Cards) and
runs on top of the TCP protocol. As SMC is a network protocol and not
an ethernet device driver, we decided to use the generic netlink
interface. This should be comparable to what other protocols in the
net subsystem like tipc, ncsi, ieee802154 or tcp, et al, do.
There is already an established internal generic netlink interface
mechanism in SMC which is used to collect SMC Protocol internal
information. This patchset extends that existing mechanism.

Guvenc Gulce (4):
  net/smc: Add SMC statistics support
  net/smc: Add netlink support for SMC statistics
  net/smc: Add netlink support for SMC fallback statistics
  net/smc: Make SMC statistics network namespace aware

 include/net/net_namespace.h |   4 +
 include/net/netns/smc.h     |  16 ++
 include/uapi/linux/smc.h    |  83 ++++++++
 net/smc/Makefile            |   2 +-
 net/smc/af_smc.c            | 102 +++++++--
 net/smc/smc_core.c          |  13 +-
 net/smc/smc_netlink.c       |  11 +
 net/smc/smc_netlink.h       |   2 +-
 net/smc/smc_rx.c            |   8 +
 net/smc/smc_stats.c         | 413 ++++++++++++++++++++++++++++++++++++
 net/smc/smc_stats.h         | 266 +++++++++++++++++++++++
 net/smc/smc_tx.c            |  18 +-
 12 files changed, 917 insertions(+), 21 deletions(-)
 create mode 100644 include/net/netns/smc.h
 create mode 100644 net/smc/smc_stats.c
 create mode 100644 net/smc/smc_stats.h

-- 
2.25.1

[PATCH net-next v2 1/4] net/smc: Add SMC statistics support

[Karsten Graul]

From: Guvenc Gulce <guvenc@linux.ibm.com>

Add the ability to collect SMC statistics information. Per-cpu
variables are used to collect the statistic information for better
performance and for reducing concurrency pitfalls. The code that is
collecting statistic data is implemented in macros to increase code
reuse and readability.

Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
---
 net/smc/Makefile    |   2 +-
 net/smc/af_smc.c    |  89 ++++++++++++----
 net/smc/smc_core.c  |  13 ++-
 net/smc/smc_rx.c    |   8 ++
 net/smc/smc_stats.c |  35 ++++++
 net/smc/smc_stats.h | 253 ++++++++++++++++++++++++++++++++++++++++++++
 net/smc/smc_tx.c    |  16 ++-
 7 files changed, 395 insertions(+), 21 deletions(-)
 create mode 100644 net/smc/smc_stats.c
 create mode 100644 net/smc/smc_stats.h

diff --git a/net/smc/Makefile b/net/smc/Makefile
index 77e54fe42b1c..99a0186cba5b 100644
--- a/net/smc/Makefile
+++ b/net/smc/Makefile
@@ -2,4 +2,4 @@
 obj-$(CONFIG_SMC)	+= smc.o
 obj-$(CONFIG_SMC_DIAG)	+= smc_diag.o
 smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o
-smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o
+smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 5eff7cccceff..efeaed384769 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -49,6 +49,7 @@
 #include "smc_tx.h"
 #include "smc_rx.h"
 #include "smc_close.h"
+#include "smc_stats.h"
 
 static DEFINE_MUTEX(smc_server_lgr_pending);	/* serialize link group
 						 * creation on server
@@ -508,9 +509,42 @@ static void smc_link_save_peer_info(struct smc_link *link,
 	link->peer_mtu = clc->r0.qp_mtu;
 }
 
-static void smc_switch_to_fallback(struct smc_sock *smc)
+static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
+				       struct smc_stats_fback *fback_arr)
+{
+	int cnt;
+
+	for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
+		if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
+			fback_arr[cnt].count++;
+			break;
+		}
+		if (!fback_arr[cnt].fback_code) {
+			fback_arr[cnt].fback_code = smc->fallback_rsn;
+			fback_arr[cnt].count++;
+			break;
+		}
+	}
+}
+
+static void smc_stat_fallback(struct smc_sock *smc)
+{
+	mutex_lock(&smc_stat_fback_rsn);
+	if (smc->listen_smc) {
+		smc_stat_inc_fback_rsn_cnt(smc, fback_rsn.srv);
+		fback_rsn.srv_fback_cnt++;
+	} else {
+		smc_stat_inc_fback_rsn_cnt(smc, fback_rsn.clnt);
+		fback_rsn.clnt_fback_cnt++;
+	}
+	mutex_unlock(&smc_stat_fback_rsn);
+}
+
+static void smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
 {
 	smc->use_fallback = true;
+	smc->fallback_rsn = reason_code;
+	smc_stat_fallback(smc);
 	if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
 		smc->clcsock->file = smc->sk.sk_socket->file;
 		smc->clcsock->file->private_data = smc->clcsock;
@@ -522,8 +556,7 @@ static void smc_switch_to_fallback(struct smc_sock *smc)
 /* fall back during connect */
 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 {
-	smc_switch_to_fallback(smc);
-	smc->fallback_rsn = reason_code;
+	smc_switch_to_fallback(smc, reason_code);
 	smc_copy_sock_settings_to_clc(smc);
 	smc->connect_nonblock = 0;
 	if (smc->sk.sk_state == SMC_INIT)
@@ -538,6 +571,7 @@ static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 	int rc;
 
 	if (reason_code < 0) { /* error, fallback is not possible */
+		this_cpu_inc(smc_stats->clnt_hshake_err_cnt);
 		if (smc->sk.sk_state == SMC_INIT)
 			sock_put(&smc->sk); /* passive closing */
 		return reason_code;
@@ -545,6 +579,7 @@ static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 	if (reason_code != SMC_CLC_DECL_PEERDECL) {
 		rc = smc_clc_send_decline(smc, reason_code, version);
 		if (rc < 0) {
+			this_cpu_inc(smc_stats->clnt_hshake_err_cnt);
 			if (smc->sk.sk_state == SMC_INIT)
 				sock_put(&smc->sk); /* passive closing */
 			return rc;
@@ -992,6 +1027,7 @@ static int __smc_connect(struct smc_sock *smc)
 	if (rc)
 		goto vlan_cleanup;
 
+	SMC_STAT_CLNT_SUCC_INC(aclc);
 	smc_connect_ism_vlan_cleanup(smc, ini);
 	kfree(buf);
 	kfree(ini);
@@ -1308,6 +1344,7 @@ static void smc_listen_out_err(struct smc_sock *new_smc)
 {
 	struct sock *newsmcsk = &new_smc->sk;
 
+	this_cpu_inc(smc_stats->srv_hshake_err_cnt);
 	if (newsmcsk->sk_state == SMC_INIT)
 		sock_put(&new_smc->sk); /* passive closing */
 	newsmcsk->sk_state = SMC_CLOSED;
@@ -1325,8 +1362,7 @@ static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
 		smc_listen_out_err(new_smc);
 		return;
 	}
-	smc_switch_to_fallback(new_smc);
-	new_smc->fallback_rsn = reason_code;
+	smc_switch_to_fallback(new_smc, reason_code);
 	if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
 		if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
 			smc_listen_out_err(new_smc);
@@ -1699,8 +1735,7 @@ static void smc_listen_work(struct work_struct *work)
 
 	/* check if peer is smc capable */
 	if (!tcp_sk(newclcsock->sk)->syn_smc) {
-		smc_switch_to_fallback(new_smc);
-		new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
+		smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
 		smc_listen_out_connected(new_smc);
 		return;
 	}
@@ -1778,6 +1813,7 @@ static void smc_listen_work(struct work_struct *work)
 	}
 	smc_conn_save_peer_info(new_smc, cclc);
 	smc_listen_out_connected(new_smc);
+	SMC_STAT_SERV_SUCC_INC(ini);
 	goto out_free;
 
 out_unlock:
@@ -1984,18 +2020,19 @@ static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 
 	if (msg->msg_flags & MSG_FASTOPEN) {
 		if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
-			smc_switch_to_fallback(smc);
-			smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
+			smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
 		} else {
 			rc = -EINVAL;
 			goto out;
 		}
 	}
 
-	if (smc->use_fallback)
+	if (smc->use_fallback) {
 		rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
-	else
+	} else {
 		rc = smc_tx_sendmsg(smc, msg, len);
+		SMC_STAT_TX_PAYLOAD(smc, len, rc);
+	}
 out:
 	release_sock(sk);
 	return rc;
@@ -2030,6 +2067,7 @@ static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
 	} else {
 		msg->msg_namelen = 0;
 		rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
+		SMC_STAT_RX_PAYLOAD(smc, rc, rc);
 	}
 
 out:
@@ -2194,8 +2232,7 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
 	case TCP_FASTOPEN_NO_COOKIE:
 		/* option not supported by SMC */
 		if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
-			smc_switch_to_fallback(smc);
-			smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
+			smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
 		} else {
 			rc = -EINVAL;
 		}
@@ -2204,18 +2241,22 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
 		if (sk->sk_state != SMC_INIT &&
 		    sk->sk_state != SMC_LISTEN &&
 		    sk->sk_state != SMC_CLOSED) {
-			if (val)
+			if (val) {
+				SMC_STAT_INC(!smc->conn.lnk, ndly_cnt);
 				mod_delayed_work(smc->conn.lgr->tx_wq,
 						 &smc->conn.tx_work, 0);
+			}
 		}
 		break;
 	case TCP_CORK:
 		if (sk->sk_state != SMC_INIT &&
 		    sk->sk_state != SMC_LISTEN &&
 		    sk->sk_state != SMC_CLOSED) {
-			if (!val)
+			if (!val) {
+				SMC_STAT_INC(!smc->conn.lnk, cork_cnt);
 				mod_delayed_work(smc->conn.lgr->tx_wq,
 						 &smc->conn.tx_work, 0);
+			}
 		}
 		break;
 	case TCP_DEFER_ACCEPT:
@@ -2338,11 +2379,13 @@ static ssize_t smc_sendpage(struct socket *sock, struct page *page,
 		goto out;
 	}
 	release_sock(sk);
-	if (smc->use_fallback)
+	if (smc->use_fallback) {
 		rc = kernel_sendpage(smc->clcsock, page, offset,
 				     size, flags);
-	else
+	} else {
+		SMC_STAT_INC(!smc->conn.lnk, sendpage_cnt);
 		rc = sock_no_sendpage(sock, page, offset, size, flags);
+	}
 
 out:
 	return rc;
@@ -2391,6 +2434,7 @@ static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
 			flags = MSG_DONTWAIT;
 		else
 			flags = 0;
+		SMC_STAT_INC(!smc->conn.lnk, splice_cnt);
 		rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
 	}
 out:
@@ -2514,10 +2558,16 @@ static int __init smc_init(void)
 	if (!smc_close_wq)
 		goto out_alloc_hs_wq;
 
+	rc = smc_stats_init();
+	if (rc) {
+		pr_err("%s: smc_stats_init fails with %d\n", __func__, rc);
+		goto out_alloc_wqs;
+	}
+
 	rc = smc_core_init();
 	if (rc) {
 		pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
-		goto out_alloc_wqs;
+		goto out_smc_stat;
 	}
 
 	rc = smc_llc_init();
@@ -2569,6 +2619,8 @@ static int __init smc_init(void)
 	proto_unregister(&smc_proto);
 out_core:
 	smc_core_exit();
+out_smc_stat:
+	smc_stats_exit();
 out_alloc_wqs:
 	destroy_workqueue(smc_close_wq);
 out_alloc_hs_wq:
@@ -2591,6 +2643,7 @@ static void __exit smc_exit(void)
 	smc_ib_unregister_client();
 	destroy_workqueue(smc_close_wq);
 	destroy_workqueue(smc_hs_wq);
+	smc_stats_exit();
 	proto_unregister(&smc_proto6);
 	proto_unregister(&smc_proto);
 	smc_pnet_exit();
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 317bc2c90fab..d69f58f670a1 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -33,6 +33,7 @@
 #include "smc_close.h"
 #include "smc_ism.h"
 #include "smc_netlink.h"
+#include "smc_stats.h"
 
 #define SMC_LGR_NUM_INCR		256
 #define SMC_LGR_FREE_DELAY_SERV		(600 * HZ)
@@ -2029,6 +2030,7 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
 	struct smc_link_group *lgr = conn->lgr;
 	struct list_head *buf_list;
 	int bufsize, bufsize_short;
+	bool is_dgraded = false;
 	struct mutex *lock;	/* lock buffer list */
 	int sk_buf_size;
 
@@ -2056,6 +2058,8 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
 		/* check for reusable slot in the link group */
 		buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
 		if (buf_desc) {
+			SMC_STAT_RMB_SIZE(is_smcd, is_rmb, bufsize);
+			SMC_STAT_BUF_REUSE(is_smcd, is_rmb);
 			memset(buf_desc->cpu_addr, 0, bufsize);
 			break; /* found reusable slot */
 		}
@@ -2067,9 +2071,16 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
 
 		if (PTR_ERR(buf_desc) == -ENOMEM)
 			break;
-		if (IS_ERR(buf_desc))
+		if (IS_ERR(buf_desc)) {
+			if (!is_dgraded) {
+				is_dgraded = true;
+				SMC_STAT_RMB_DOWNGRADED(is_smcd, is_rmb);
+			}
 			continue;
+		}
 
+		SMC_STAT_RMB_ALLOC(is_smcd, is_rmb);
+		SMC_STAT_RMB_SIZE(is_smcd, is_rmb, bufsize);
 		buf_desc->used = 1;
 		mutex_lock(lock);
 		list_add(&buf_desc->list, buf_list);
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index fcfac59f8b72..ce1ae39923b1 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -21,6 +21,7 @@
 #include "smc_cdc.h"
 #include "smc_tx.h" /* smc_tx_consumer_update() */
 #include "smc_rx.h"
+#include "smc_stats.h"
 
 /* callback implementation to wakeup consumers blocked with smc_rx_wait().
  * indirectly called by smc_cdc_msg_recv_action().
@@ -227,6 +228,7 @@ static int smc_rx_recv_urg(struct smc_sock *smc, struct msghdr *msg, int len,
 	    conn->urg_state == SMC_URG_READ)
 		return -EINVAL;
 
+	SMC_STAT_INC(!conn->lnk, urg_data_cnt);
 	if (conn->urg_state == SMC_URG_VALID) {
 		if (!(flags & MSG_PEEK))
 			smc->conn.urg_state = SMC_URG_READ;
@@ -303,6 +305,12 @@ int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg,
 	timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 	target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
 
+	readable = atomic_read(&conn->bytes_to_rcv);
+	if (readable >= conn->rmb_desc->len)
+		SMC_STAT_RMB_RX_FULL(!conn->lnk);
+
+	if (len < readable)
+		SMC_STAT_RMB_RX_SIZE_SMALL(!conn->lnk);
 	/* we currently use 1 RMBE per RMB, so RMBE == RMB base addr */
 	rcvbuf_base = conn->rx_off + conn->rmb_desc->cpu_addr;
 
diff --git a/net/smc/smc_stats.c b/net/smc/smc_stats.c
new file mode 100644
index 000000000000..76e938388520
--- /dev/null
+++ b/net/smc/smc_stats.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * SMC statistics netlink routines
+ *
+ * Copyright IBM Corp. 2021
+ *
+ * Author(s):  Guvenc Gulce
+ */
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/ctype.h>
+#include "smc_stats.h"
+
+/* serialize fallback reason statistic gathering */
+DEFINE_MUTEX(smc_stat_fback_rsn);
+struct smc_stats __percpu *smc_stats;	/* per cpu counters for SMC */
+struct smc_stats_reason fback_rsn;
+
+int __init smc_stats_init(void)
+{
+	memset(&fback_rsn, 0, sizeof(fback_rsn));
+	smc_stats = alloc_percpu(struct smc_stats);
+	if (!smc_stats)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void smc_stats_exit(void)
+{
+	free_percpu(smc_stats);
+}
diff --git a/net/smc/smc_stats.h b/net/smc/smc_stats.h
new file mode 100644
index 000000000000..928372114cf1
--- /dev/null
+++ b/net/smc/smc_stats.h
@@ -0,0 +1,253 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Shared Memory Communications over RDMA (SMC-R) and RoCE
+ *
+ * Macros for SMC statistics
+ *
+ * Copyright IBM Corp. 2021
+ *
+ * Author(s):  Guvenc Gulce
+ */
+
+#ifndef NET_SMC_SMC_STATS_H_
+#define NET_SMC_SMC_STATS_H_
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/ctype.h>
+#include <linux/smc.h>
+
+#include "smc_clc.h"
+
+#define SMC_MAX_FBACK_RSN_CNT 30
+
+extern struct smc_stats __percpu *smc_stats;	/* per cpu counters for SMC */
+extern struct smc_stats_reason fback_rsn;
+extern struct mutex smc_stat_fback_rsn;
+
+enum {
+	SMC_BUF_8K,
+	SMC_BUF_16K,
+	SMC_BUF_32K,
+	SMC_BUF_64K,
+	SMC_BUF_128K,
+	SMC_BUF_256K,
+	SMC_BUF_512K,
+	SMC_BUF_1024K,
+	SMC_BUF_G_1024K,
+	SMC_BUF_MAX,
+};
+
+struct smc_stats_fback {
+	int	fback_code;
+	u16	count;
+};
+
+struct smc_stats_reason {
+	struct	smc_stats_fback srv[SMC_MAX_FBACK_RSN_CNT];
+	struct	smc_stats_fback clnt[SMC_MAX_FBACK_RSN_CNT];
+	u64			srv_fback_cnt;
+	u64			clnt_fback_cnt;
+};
+
+struct smc_stats_rmbcnt {
+	u64	buf_size_small_peer_cnt;
+	u64	buf_size_small_cnt;
+	u64	buf_full_peer_cnt;
+	u64	buf_full_cnt;
+	u64	reuse_cnt;
+	u64	alloc_cnt;
+	u64	dgrade_cnt;
+};
+
+struct smc_stats_memsize {
+	u64	buf[SMC_BUF_MAX];
+};
+
+struct smc_stats_tech {
+	struct smc_stats_memsize tx_rmbsize;
+	struct smc_stats_memsize rx_rmbsize;
+	struct smc_stats_memsize tx_pd;
+	struct smc_stats_memsize rx_pd;
+	struct smc_stats_rmbcnt rmb_tx;
+	struct smc_stats_rmbcnt rmb_rx;
+	u64			clnt_v1_succ_cnt;
+	u64			clnt_v2_succ_cnt;
+	u64			srv_v1_succ_cnt;
+	u64			srv_v2_succ_cnt;
+	u64			sendpage_cnt;
+	u64			urg_data_cnt;
+	u64			splice_cnt;
+	u64			cork_cnt;
+	u64			ndly_cnt;
+	u64			rx_bytes;
+	u64			tx_bytes;
+	u64			rx_cnt;
+	u64			tx_cnt;
+};
+
+struct smc_stats {
+	struct smc_stats_tech	smc[2];
+	u64			clnt_hshake_err_cnt;
+	u64			srv_hshake_err_cnt;
+};
+
+#define SMC_STAT_PAYLOAD_SUB(_tech, key, _len, _rc) \
+do { \
+	typeof(_tech) t = (_tech); \
+	typeof(_len) l = (_len); \
+	int _pos = fls64((l) >> 13); \
+	typeof(_rc) r = (_rc); \
+	int m = SMC_BUF_MAX - 1; \
+	this_cpu_inc((*smc_stats).smc[t].key ## _cnt); \
+	if (r <= 0) \
+		break; \
+	_pos = (_pos < m) ? ((l == 1 << (_pos + 12)) ? _pos - 1 : _pos) : m; \
+	this_cpu_inc((*smc_stats).smc[t].key ## _pd.buf[_pos]); \
+	this_cpu_add((*smc_stats).smc[t].key ## _bytes, r); \
+} \
+while (0)
+
+#define SMC_STAT_TX_PAYLOAD(_smc, length, rcode) \
+do { \
+	typeof(_smc) __smc = _smc; \
+	typeof(length) _len = (length); \
+	typeof(rcode) _rc = (rcode); \
+	bool is_smcd = !__smc->conn.lnk; \
+	if (is_smcd) \
+		SMC_STAT_PAYLOAD_SUB(SMC_TYPE_D, tx, _len, _rc); \
+	else \
+		SMC_STAT_PAYLOAD_SUB(SMC_TYPE_R, tx, _len, _rc); \
+} \
+while (0)
+
+#define SMC_STAT_RX_PAYLOAD(_smc, length, rcode) \
+do { \
+	typeof(_smc) __smc = _smc; \
+	typeof(length) _len = (length); \
+	typeof(rcode) _rc = (rcode); \
+	bool is_smcd = !__smc->conn.lnk; \
+	if (is_smcd) \
+		SMC_STAT_PAYLOAD_SUB(SMC_TYPE_D, rx, _len, _rc); \
+	else \
+		SMC_STAT_PAYLOAD_SUB(SMC_TYPE_R, rx, _len, _rc); \
+} \
+while (0)
+
+#define SMC_STAT_RMB_SIZE_SUB(_tech, k, _len) \
+do { \
+	typeof(_len) _l = (_len); \
+	typeof(_tech) t = (_tech); \
+	int _pos = fls((_l) >> 13); \
+	int m = SMC_BUF_MAX - 1; \
+	_pos = (_pos < m) ? ((_l == 1 << (_pos + 12)) ? _pos - 1 : _pos) : m; \
+	this_cpu_inc((*smc_stats).smc[t].k ## _rmbsize.buf[_pos]); \
+} \
+while (0)
+
+#define SMC_STAT_RMB_SUB(type, t, key) \
+	this_cpu_inc((*smc_stats).smc[t].rmb ## _ ## key.type ## _cnt)
+
+#define SMC_STAT_RMB_SIZE(_is_smcd, _is_rx, _len) \
+do { \
+	typeof(_is_smcd) is_d = (_is_smcd); \
+	typeof(_is_rx) is_r = (_is_rx); \
+	typeof(_len) l = (_len); \
+	if ((is_d) && (is_r)) \
+		SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_D, rx, l); \
+	if ((is_d) && !(is_r)) \
+		SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_D, tx, l); \
+	if (!(is_d) && (is_r)) \
+		SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_R, rx, l); \
+	if (!(is_d) && !(is_r)) \
+		SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_R, tx, l); \
+} \
+while (0)
+
+#define SMC_STAT_RMB(type, _is_smcd, _is_rx) \
+do { \
+	typeof(_is_smcd) is_d = (_is_smcd); \
+	typeof(_is_rx) is_r = (_is_rx); \
+	if ((is_d) && (is_r)) \
+		SMC_STAT_RMB_SUB(type, SMC_TYPE_D, rx); \
+	if ((is_d) && !(is_r)) \
+		SMC_STAT_RMB_SUB(type, SMC_TYPE_D, tx); \
+	if (!(is_d) && (is_r)) \
+		SMC_STAT_RMB_SUB(type, SMC_TYPE_R, rx); \
+	if (!(is_d) && !(is_r)) \
+		SMC_STAT_RMB_SUB(type, SMC_TYPE_R, tx); \
+} \
+while (0)
+
+#define SMC_STAT_BUF_REUSE(is_smcd, is_rx) \
+	SMC_STAT_RMB(reuse, is_smcd, is_rx)
+
+#define SMC_STAT_RMB_ALLOC(is_smcd, is_rx) \
+	SMC_STAT_RMB(alloc, is_smcd, is_rx)
+
+#define SMC_STAT_RMB_DOWNGRADED(is_smcd, is_rx) \
+	SMC_STAT_RMB(dgrade, is_smcd, is_rx)
+
+#define SMC_STAT_RMB_TX_PEER_FULL(is_smcd) \
+	SMC_STAT_RMB(buf_full_peer, is_smcd, false)
+
+#define SMC_STAT_RMB_TX_FULL(is_smcd) \
+	SMC_STAT_RMB(buf_full, is_smcd, false)
+
+#define SMC_STAT_RMB_TX_PEER_SIZE_SMALL(is_smcd) \
+	SMC_STAT_RMB(buf_size_small_peer, is_smcd, false)
+
+#define SMC_STAT_RMB_TX_SIZE_SMALL(is_smcd) \
+	SMC_STAT_RMB(buf_size_small, is_smcd, false)
+
+#define SMC_STAT_RMB_RX_SIZE_SMALL(is_smcd) \
+	SMC_STAT_RMB(buf_size_small, is_smcd, true)
+
+#define SMC_STAT_RMB_RX_FULL(is_smcd) \
+	SMC_STAT_RMB(buf_full, is_smcd, true)
+
+#define SMC_STAT_INC(is_smcd, type) \
+do { \
+	if ((is_smcd)) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].type); \
+	else \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_R].type); \
+} \
+while (0)
+
+#define SMC_STAT_CLNT_SUCC_INC(_aclc) \
+do { \
+	typeof(_aclc) acl = (_aclc); \
+	bool is_v2 = (acl->hdr.version == SMC_V2); \
+	bool is_smcd = (acl->hdr.typev1 == SMC_TYPE_D); \
+	if (is_v2 && is_smcd) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].clnt_v2_succ_cnt); \
+	else if (is_v2 && !is_smcd) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_R].clnt_v2_succ_cnt); \
+	else if (!is_v2 && is_smcd) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].clnt_v1_succ_cnt); \
+	else if (!is_v2 && !is_smcd) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_R].clnt_v1_succ_cnt); \
+} \
+while (0)
+
+#define SMC_STAT_SERV_SUCC_INC(_ini) \
+do { \
+	typeof(_ini) i = (_ini); \
+	bool is_v2 = (i->smcd_version & SMC_V2); \
+	bool is_smcd = (i->is_smcd); \
+	if (is_v2 && is_smcd) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].srv_v2_succ_cnt); \
+	else if (is_v2 && !is_smcd) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_R].srv_v2_succ_cnt); \
+	else if (!is_v2 && is_smcd) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].srv_v1_succ_cnt); \
+	else if (!is_v2 && !is_smcd) \
+		this_cpu_inc(smc_stats->smc[SMC_TYPE_R].srv_v1_succ_cnt); \
+} \
+while (0)
+
+int smc_stats_init(void) __init;
+void smc_stats_exit(void);
+
+#endif /* NET_SMC_SMC_STATS_H_ */
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index 4532c16bf85e..a043544d715f 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -27,6 +27,7 @@
 #include "smc_close.h"
 #include "smc_ism.h"
 #include "smc_tx.h"
+#include "smc_stats.h"
 
 #define SMC_TX_WORK_DELAY	0
 #define SMC_TX_CORK_DELAY	(HZ >> 2)	/* 250 ms */
@@ -45,6 +46,8 @@ static void smc_tx_write_space(struct sock *sk)
 
 	/* similar to sk_stream_write_space */
 	if (atomic_read(&smc->conn.sndbuf_space) && sock) {
+		if (test_bit(SOCK_NOSPACE, &sock->flags))
+			SMC_STAT_RMB_TX_FULL(!smc->conn.lnk);
 		clear_bit(SOCK_NOSPACE, &sock->flags);
 		rcu_read_lock();
 		wq = rcu_dereference(sk->sk_wq);
@@ -151,6 +154,15 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 		goto out_err;
 	}
 
+	if (len > conn->sndbuf_desc->len)
+		SMC_STAT_RMB_TX_SIZE_SMALL(!conn->lnk);
+
+	if (len > conn->peer_rmbe_size)
+		SMC_STAT_RMB_TX_PEER_SIZE_SMALL(!conn->lnk);
+
+	if (msg->msg_flags & MSG_OOB)
+		SMC_STAT_INC(!conn->lnk, urg_data_cnt);
+
 	while (msg_data_left(msg)) {
 		if (sk->sk_state == SMC_INIT)
 			return -ENOTCONN;
@@ -419,8 +431,10 @@ static int smc_tx_rdma_writes(struct smc_connection *conn,
 	/* destination: RMBE */
 	/* cf. snd_wnd */
 	rmbespace = atomic_read(&conn->peer_rmbe_space);
-	if (rmbespace <= 0)
+	if (rmbespace <= 0) {
+		SMC_STAT_RMB_TX_PEER_FULL(!conn->lnk);
 		return 0;
+	}
 	smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
 	smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
 
-- 
2.25.1

[PATCH net-next v2 2/4] net/smc: Add netlink support for SMC statistics

[Karsten Graul]

From: Guvenc Gulce <guvenc@linux.ibm.com>

Add the netlink function which collects the statistics information and
delivers it to the userspace.

Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
---
 include/uapi/linux/smc.h |  69 ++++++++++
 net/smc/smc_netlink.c    |   6 +
 net/smc/smc_stats.c      | 279 +++++++++++++++++++++++++++++++++++++++
 net/smc/smc_stats.h      |   1 +
 4 files changed, 355 insertions(+)

diff --git a/include/uapi/linux/smc.h b/include/uapi/linux/smc.h
index 3e68da07fba2..f32f11b30963 100644
--- a/include/uapi/linux/smc.h
+++ b/include/uapi/linux/smc.h
@@ -47,6 +47,7 @@ enum {
 	SMC_NETLINK_GET_LGR_SMCD,
 	SMC_NETLINK_GET_DEV_SMCD,
 	SMC_NETLINK_GET_DEV_SMCR,
+	SMC_NETLINK_GET_STATS,
 };
 
 /* SMC_GENL_FAMILY top level attributes */
@@ -58,6 +59,7 @@ enum {
 	SMC_GEN_LGR_SMCD,		/* nest */
 	SMC_GEN_DEV_SMCD,		/* nest */
 	SMC_GEN_DEV_SMCR,		/* nest */
+	SMC_GEN_STATS,			/* nest */
 	__SMC_GEN_MAX,
 	SMC_GEN_MAX = __SMC_GEN_MAX - 1
 };
@@ -159,4 +161,71 @@ enum {
 	SMC_NLA_DEV_MAX = __SMC_NLA_DEV_MAX - 1
 };
 
+/* SMC_NLA_STATS_T_TX(RX)_RMB_SIZE nested attributes */
+/* SMC_NLA_STATS_TX(RX)PLOAD_SIZE nested attributes */
+enum {
+	SMC_NLA_STATS_PLOAD_PAD,
+	SMC_NLA_STATS_PLOAD_8K,		/* u64 */
+	SMC_NLA_STATS_PLOAD_16K,	/* u64 */
+	SMC_NLA_STATS_PLOAD_32K,	/* u64 */
+	SMC_NLA_STATS_PLOAD_64K,	/* u64 */
+	SMC_NLA_STATS_PLOAD_128K,	/* u64 */
+	SMC_NLA_STATS_PLOAD_256K,	/* u64 */
+	SMC_NLA_STATS_PLOAD_512K,	/* u64 */
+	SMC_NLA_STATS_PLOAD_1024K,	/* u64 */
+	SMC_NLA_STATS_PLOAD_G_1024K,	/* u64 */
+	__SMC_NLA_STATS_PLOAD_MAX,
+	SMC_NLA_STATS_PLOAD_MAX = __SMC_NLA_STATS_PLOAD_MAX - 1
+};
+
+/* SMC_NLA_STATS_T_TX(RX)_RMB_STATS nested attributes */
+enum {
+	SMC_NLA_STATS_RMB_PAD,
+	SMC_NLA_STATS_RMB_SIZE_SM_PEER_CNT,	/* u64 */
+	SMC_NLA_STATS_RMB_SIZE_SM_CNT,		/* u64 */
+	SMC_NLA_STATS_RMB_FULL_PEER_CNT,	/* u64 */
+	SMC_NLA_STATS_RMB_FULL_CNT,		/* u64 */
+	SMC_NLA_STATS_RMB_REUSE_CNT,		/* u64 */
+	SMC_NLA_STATS_RMB_ALLOC_CNT,		/* u64 */
+	SMC_NLA_STATS_RMB_DGRADE_CNT,		/* u64 */
+	__SMC_NLA_STATS_RMB_MAX,
+	SMC_NLA_STATS_RMB_MAX = __SMC_NLA_STATS_RMB_MAX - 1
+};
+
+/* SMC_NLA_STATS_SMCD_TECH and _SMCR_TECH nested attributes */
+enum {
+	SMC_NLA_STATS_T_PAD,
+	SMC_NLA_STATS_T_TX_RMB_SIZE,	/* nest */
+	SMC_NLA_STATS_T_RX_RMB_SIZE,	/* nest */
+	SMC_NLA_STATS_T_TXPLOAD_SIZE,	/* nest */
+	SMC_NLA_STATS_T_RXPLOAD_SIZE,	/* nest */
+	SMC_NLA_STATS_T_TX_RMB_STATS,	/* nest */
+	SMC_NLA_STATS_T_RX_RMB_STATS,	/* nest */
+	SMC_NLA_STATS_T_CLNT_V1_SUCC,	/* u64 */
+	SMC_NLA_STATS_T_CLNT_V2_SUCC,	/* u64 */
+	SMC_NLA_STATS_T_SRV_V1_SUCC,	/* u64 */
+	SMC_NLA_STATS_T_SRV_V2_SUCC,	/* u64 */
+	SMC_NLA_STATS_T_SENDPAGE_CNT,	/* u64 */
+	SMC_NLA_STATS_T_SPLICE_CNT,	/* u64 */
+	SMC_NLA_STATS_T_CORK_CNT,	/* u64 */
+	SMC_NLA_STATS_T_NDLY_CNT,	/* u64 */
+	SMC_NLA_STATS_T_URG_DATA_CNT,	/* u64 */
+	SMC_NLA_STATS_T_RX_BYTES,	/* u64 */
+	SMC_NLA_STATS_T_TX_BYTES,	/* u64 */
+	SMC_NLA_STATS_T_RX_CNT,		/* u64 */
+	SMC_NLA_STATS_T_TX_CNT,		/* u64 */
+	__SMC_NLA_STATS_T_MAX,
+	SMC_NLA_STATS_T_MAX = __SMC_NLA_STATS_T_MAX - 1
+};
+
+/* SMC_GEN_STATS attributes */
+enum {
+	SMC_NLA_STATS_PAD,
+	SMC_NLA_STATS_SMCD_TECH,	/* nest */
+	SMC_NLA_STATS_SMCR_TECH,	/* nest */
+	SMC_NLA_STATS_CLNT_HS_ERR_CNT,	/* u64 */
+	SMC_NLA_STATS_SRV_HS_ERR_CNT,	/* u64 */
+	__SMC_NLA_STATS_MAX,
+	SMC_NLA_STATS_MAX = __SMC_NLA_STATS_MAX - 1
+};
 #endif /* _UAPI_LINUX_SMC_H */
diff --git a/net/smc/smc_netlink.c b/net/smc/smc_netlink.c
index 140419a19dbf..30e30b23370f 100644
--- a/net/smc/smc_netlink.c
+++ b/net/smc/smc_netlink.c
@@ -19,6 +19,7 @@
 #include "smc_core.h"
 #include "smc_ism.h"
 #include "smc_ib.h"
+#include "smc_stats.h"
 #include "smc_netlink.h"
 
 #define SMC_CMD_MAX_ATTR 1
@@ -55,6 +56,11 @@ static const struct genl_ops smc_gen_nl_ops[] = {
 		/* can be retrieved by unprivileged users */
 		.dumpit = smcr_nl_get_device,
 	},
+	{
+		.cmd = SMC_NETLINK_GET_STATS,
+		/* can be retrieved by unprivileged users */
+		.dumpit = smc_nl_get_stats,
+	},
 };
 
 static const struct nla_policy smc_gen_nl_policy[2] = {
diff --git a/net/smc/smc_stats.c b/net/smc/smc_stats.c
index 76e938388520..72119d3d8558 100644
--- a/net/smc/smc_stats.c
+++ b/net/smc/smc_stats.c
@@ -12,6 +12,10 @@
 #include <linux/mutex.h>
 #include <linux/percpu.h>
 #include <linux/ctype.h>
+#include <linux/smc.h>
+#include <net/genetlink.h>
+#include <net/sock.h>
+#include "smc_netlink.h"
 #include "smc_stats.h"
 
 /* serialize fallback reason statistic gathering */
@@ -33,3 +37,278 @@ void smc_stats_exit(void)
 {
 	free_percpu(smc_stats);
 }
+
+static int smc_nl_fill_stats_rmb_data(struct sk_buff *skb,
+				      struct smc_stats *stats, int tech,
+				      int type)
+{
+	struct smc_stats_rmbcnt *stats_rmb_cnt;
+	struct nlattr *attrs;
+
+	if (type == SMC_NLA_STATS_T_TX_RMB_STATS)
+		stats_rmb_cnt = &stats->smc[tech].rmb_tx;
+	else
+		stats_rmb_cnt = &stats->smc[tech].rmb_rx;
+
+	attrs = nla_nest_start(skb, type);
+	if (!attrs)
+		goto errout;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_REUSE_CNT,
+			      stats_rmb_cnt->reuse_cnt,
+			      SMC_NLA_STATS_RMB_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_SIZE_SM_PEER_CNT,
+			      stats_rmb_cnt->buf_size_small_peer_cnt,
+			      SMC_NLA_STATS_RMB_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_SIZE_SM_CNT,
+			      stats_rmb_cnt->buf_size_small_cnt,
+			      SMC_NLA_STATS_RMB_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_FULL_PEER_CNT,
+			      stats_rmb_cnt->buf_full_peer_cnt,
+			      SMC_NLA_STATS_RMB_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_FULL_CNT,
+			      stats_rmb_cnt->buf_full_cnt,
+			      SMC_NLA_STATS_RMB_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_ALLOC_CNT,
+			      stats_rmb_cnt->alloc_cnt,
+			      SMC_NLA_STATS_RMB_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_DGRADE_CNT,
+			      stats_rmb_cnt->dgrade_cnt,
+			      SMC_NLA_STATS_RMB_PAD))
+		goto errattr;
+
+	nla_nest_end(skb, attrs);
+	return 0;
+
+errattr:
+	nla_nest_cancel(skb, attrs);
+errout:
+	return -EMSGSIZE;
+}
+
+static int smc_nl_fill_stats_bufsize_data(struct sk_buff *skb,
+					  struct smc_stats *stats, int tech,
+					  int type)
+{
+	struct smc_stats_memsize *stats_pload;
+	struct nlattr *attrs;
+
+	if (type == SMC_NLA_STATS_T_TXPLOAD_SIZE)
+		stats_pload = &stats->smc[tech].tx_pd;
+	else if (type == SMC_NLA_STATS_T_RXPLOAD_SIZE)
+		stats_pload = &stats->smc[tech].rx_pd;
+	else if (type == SMC_NLA_STATS_T_TX_RMB_SIZE)
+		stats_pload = &stats->smc[tech].tx_rmbsize;
+	else if (type == SMC_NLA_STATS_T_RX_RMB_SIZE)
+		stats_pload = &stats->smc[tech].rx_rmbsize;
+	else
+		goto errout;
+
+	attrs = nla_nest_start(skb, type);
+	if (!attrs)
+		goto errout;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_8K,
+			      stats_pload->buf[SMC_BUF_8K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_16K,
+			      stats_pload->buf[SMC_BUF_16K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_32K,
+			      stats_pload->buf[SMC_BUF_32K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_64K,
+			      stats_pload->buf[SMC_BUF_64K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_128K,
+			      stats_pload->buf[SMC_BUF_128K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_256K,
+			      stats_pload->buf[SMC_BUF_256K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_512K,
+			      stats_pload->buf[SMC_BUF_512K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_1024K,
+			      stats_pload->buf[SMC_BUF_1024K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_G_1024K,
+			      stats_pload->buf[SMC_BUF_G_1024K],
+			      SMC_NLA_STATS_PLOAD_PAD))
+		goto errattr;
+
+	nla_nest_end(skb, attrs);
+	return 0;
+
+errattr:
+	nla_nest_cancel(skb, attrs);
+errout:
+	return -EMSGSIZE;
+}
+
+static int smc_nl_fill_stats_tech_data(struct sk_buff *skb,
+				       struct smc_stats *stats, int tech)
+{
+	struct smc_stats_tech *smc_tech;
+	struct nlattr *attrs;
+
+	smc_tech = &stats->smc[tech];
+	if (tech == SMC_TYPE_D)
+		attrs = nla_nest_start(skb, SMC_NLA_STATS_SMCD_TECH);
+	else
+		attrs = nla_nest_start(skb, SMC_NLA_STATS_SMCR_TECH);
+
+	if (!attrs)
+		goto errout;
+	if (smc_nl_fill_stats_rmb_data(skb, stats, tech,
+				       SMC_NLA_STATS_T_TX_RMB_STATS))
+		goto errattr;
+	if (smc_nl_fill_stats_rmb_data(skb, stats, tech,
+				       SMC_NLA_STATS_T_RX_RMB_STATS))
+		goto errattr;
+	if (smc_nl_fill_stats_bufsize_data(skb, stats, tech,
+					   SMC_NLA_STATS_T_TXPLOAD_SIZE))
+		goto errattr;
+	if (smc_nl_fill_stats_bufsize_data(skb, stats, tech,
+					   SMC_NLA_STATS_T_RXPLOAD_SIZE))
+		goto errattr;
+	if (smc_nl_fill_stats_bufsize_data(skb, stats, tech,
+					   SMC_NLA_STATS_T_TX_RMB_SIZE))
+		goto errattr;
+	if (smc_nl_fill_stats_bufsize_data(skb, stats, tech,
+					   SMC_NLA_STATS_T_RX_RMB_SIZE))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_CLNT_V1_SUCC,
+			      smc_tech->clnt_v1_succ_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_CLNT_V2_SUCC,
+			      smc_tech->clnt_v2_succ_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_SRV_V1_SUCC,
+			      smc_tech->srv_v1_succ_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_SRV_V2_SUCC,
+			      smc_tech->srv_v2_succ_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_RX_BYTES,
+			      smc_tech->rx_bytes,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_TX_BYTES,
+			      smc_tech->tx_bytes,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_RX_CNT,
+			      smc_tech->rx_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_TX_CNT,
+			      smc_tech->tx_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_SENDPAGE_CNT,
+			      smc_tech->sendpage_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_CORK_CNT,
+			      smc_tech->cork_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_NDLY_CNT,
+			      smc_tech->ndly_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_SPLICE_CNT,
+			      smc_tech->splice_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_URG_DATA_CNT,
+			      smc_tech->urg_data_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+
+	nla_nest_end(skb, attrs);
+	return 0;
+
+errattr:
+	nla_nest_cancel(skb, attrs);
+errout:
+	return -EMSGSIZE;
+}
+
+int smc_nl_get_stats(struct sk_buff *skb,
+		     struct netlink_callback *cb)
+{
+	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
+	struct smc_stats *stats;
+	struct nlattr *attrs;
+	int cpu, i, size;
+	void *nlh;
+	u64 *src;
+	u64 *sum;
+
+	if (cb_ctx->pos[0])
+		goto errmsg;
+	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			  &smc_gen_nl_family, NLM_F_MULTI,
+			  SMC_NETLINK_GET_STATS);
+	if (!nlh)
+		goto errmsg;
+
+	attrs = nla_nest_start(skb, SMC_GEN_STATS);
+	if (!attrs)
+		goto errnest;
+	stats = kzalloc(sizeof(*stats), GFP_KERNEL);
+	if (!stats)
+		goto erralloc;
+	size = sizeof(*stats) / sizeof(u64);
+	for_each_possible_cpu(cpu) {
+		src = (u64 *)per_cpu_ptr(smc_stats, cpu);
+		sum = (u64 *)stats;
+		for (i = 0; i < size; i++)
+			*(sum++) += *(src++);
+	}
+	if (smc_nl_fill_stats_tech_data(skb, stats, SMC_TYPE_D))
+		goto errattr;
+	if (smc_nl_fill_stats_tech_data(skb, stats, SMC_TYPE_R))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_CLNT_HS_ERR_CNT,
+			      stats->clnt_hshake_err_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_STATS_SRV_HS_ERR_CNT,
+			      stats->srv_hshake_err_cnt,
+			      SMC_NLA_STATS_PAD))
+		goto errattr;
+
+	nla_nest_end(skb, attrs);
+	genlmsg_end(skb, nlh);
+	cb_ctx->pos[0] = 1;
+	kfree(stats);
+	return skb->len;
+
+errattr:
+	kfree(stats);
+erralloc:
+	nla_nest_cancel(skb, attrs);
+errnest:
+	genlmsg_cancel(skb, nlh);
+errmsg:
+	return skb->len;
+}
diff --git a/net/smc/smc_stats.h b/net/smc/smc_stats.h
index 928372114cf1..84baaca59eaf 100644
--- a/net/smc/smc_stats.h
+++ b/net/smc/smc_stats.h
@@ -247,6 +247,7 @@ do { \
 } \
 while (0)
 
+int smc_nl_get_stats(struct sk_buff *skb, struct netlink_callback *cb);
 int smc_stats_init(void) __init;
 void smc_stats_exit(void);
 
-- 
2.25.1

[PATCH net-next v2 3/4] net/smc: Add netlink support for SMC fallback statistics

[Karsten Graul]

From: Guvenc Gulce <guvenc@linux.ibm.com>

Add support to collect more detailed SMC fallback reason statistics and
provide these statistics to user space on the netlink interface.

Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
---
 include/uapi/linux/smc.h | 14 ++++++
 net/smc/smc_netlink.c    |  5 +++
 net/smc/smc_netlink.h    |  2 +-
 net/smc/smc_stats.c      | 92 ++++++++++++++++++++++++++++++++++++++++
 net/smc/smc_stats.h      |  1 +
 5 files changed, 113 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/smc.h b/include/uapi/linux/smc.h
index f32f11b30963..0f7f87c70baf 100644
--- a/include/uapi/linux/smc.h
+++ b/include/uapi/linux/smc.h
@@ -48,6 +48,7 @@ enum {
 	SMC_NETLINK_GET_DEV_SMCD,
 	SMC_NETLINK_GET_DEV_SMCR,
 	SMC_NETLINK_GET_STATS,
+	SMC_NETLINK_GET_FBACK_STATS,
 };
 
 /* SMC_GENL_FAMILY top level attributes */
@@ -60,6 +61,7 @@ enum {
 	SMC_GEN_DEV_SMCD,		/* nest */
 	SMC_GEN_DEV_SMCR,		/* nest */
 	SMC_GEN_STATS,			/* nest */
+	SMC_GEN_FBACK_STATS,		/* nest */
 	__SMC_GEN_MAX,
 	SMC_GEN_MAX = __SMC_GEN_MAX - 1
 };
@@ -228,4 +230,16 @@ enum {
 	__SMC_NLA_STATS_MAX,
 	SMC_NLA_STATS_MAX = __SMC_NLA_STATS_MAX - 1
 };
+
+/* SMC_GEN_FBACK_STATS attributes */
+enum {
+	SMC_NLA_FBACK_STATS_PAD,
+	SMC_NLA_FBACK_STATS_TYPE,	/* u8 */
+	SMC_NLA_FBACK_STATS_SRV_CNT,	/* u64 */
+	SMC_NLA_FBACK_STATS_CLNT_CNT,	/* u64 */
+	SMC_NLA_FBACK_STATS_RSN_CODE,	/* u32 */
+	SMC_NLA_FBACK_STATS_RSN_CNT,	/* u16 */
+	__SMC_NLA_FBACK_STATS_MAX,
+	SMC_NLA_FBACK_STATS_MAX = __SMC_NLA_FBACK_STATS_MAX - 1
+};
 #endif /* _UAPI_LINUX_SMC_H */
diff --git a/net/smc/smc_netlink.c b/net/smc/smc_netlink.c
index 30e30b23370f..6fb6f96c1d17 100644
--- a/net/smc/smc_netlink.c
+++ b/net/smc/smc_netlink.c
@@ -61,6 +61,11 @@ static const struct genl_ops smc_gen_nl_ops[] = {
 		/* can be retrieved by unprivileged users */
 		.dumpit = smc_nl_get_stats,
 	},
+	{
+		.cmd = SMC_NETLINK_GET_FBACK_STATS,
+		/* can be retrieved by unprivileged users */
+		.dumpit = smc_nl_get_fback_stats,
+	},
 };
 
 static const struct nla_policy smc_gen_nl_policy[2] = {
diff --git a/net/smc/smc_netlink.h b/net/smc/smc_netlink.h
index 3477265cba6c..5ce2c0a89ccd 100644
--- a/net/smc/smc_netlink.h
+++ b/net/smc/smc_netlink.h
@@ -18,7 +18,7 @@
 extern struct genl_family smc_gen_nl_family;
 
 struct smc_nl_dmp_ctx {
-	int pos[2];
+	int pos[3];
 };
 
 static inline struct smc_nl_dmp_ctx *smc_nl_dmp_ctx(struct netlink_callback *c)
diff --git a/net/smc/smc_stats.c b/net/smc/smc_stats.c
index 72119d3d8558..b3d279d29c52 100644
--- a/net/smc/smc_stats.c
+++ b/net/smc/smc_stats.c
@@ -312,3 +312,95 @@ int smc_nl_get_stats(struct sk_buff *skb,
 errmsg:
 	return skb->len;
 }
+
+static int smc_nl_get_fback_details(struct sk_buff *skb,
+				    struct netlink_callback *cb, int pos,
+				    bool is_srv)
+{
+	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
+	int cnt_reported = cb_ctx->pos[2];
+	struct smc_stats_fback *trgt_arr;
+	struct nlattr *attrs;
+	int rc = 0;
+	void *nlh;
+
+	if (is_srv)
+		trgt_arr = &fback_rsn.srv[0];
+	else
+		trgt_arr = &fback_rsn.clnt[0];
+	if (!trgt_arr[pos].fback_code)
+		return -ENODATA;
+	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			  &smc_gen_nl_family, NLM_F_MULTI,
+			  SMC_NETLINK_GET_FBACK_STATS);
+	if (!nlh)
+		goto errmsg;
+	attrs = nla_nest_start(skb, SMC_GEN_FBACK_STATS);
+	if (!attrs)
+		goto errout;
+	if (nla_put_u8(skb, SMC_NLA_FBACK_STATS_TYPE, is_srv))
+		goto errattr;
+	if (!cnt_reported) {
+		if (nla_put_u64_64bit(skb, SMC_NLA_FBACK_STATS_SRV_CNT,
+				      fback_rsn.srv_fback_cnt,
+				      SMC_NLA_FBACK_STATS_PAD))
+			goto errattr;
+		if (nla_put_u64_64bit(skb, SMC_NLA_FBACK_STATS_CLNT_CNT,
+				      fback_rsn.clnt_fback_cnt,
+				      SMC_NLA_FBACK_STATS_PAD))
+			goto errattr;
+		cnt_reported = 1;
+	}
+
+	if (nla_put_u32(skb, SMC_NLA_FBACK_STATS_RSN_CODE,
+			trgt_arr[pos].fback_code))
+		goto errattr;
+	if (nla_put_u16(skb, SMC_NLA_FBACK_STATS_RSN_CNT,
+			trgt_arr[pos].count))
+		goto errattr;
+
+	cb_ctx->pos[2] = cnt_reported;
+	nla_nest_end(skb, attrs);
+	genlmsg_end(skb, nlh);
+	return rc;
+
+errattr:
+	nla_nest_cancel(skb, attrs);
+errout:
+	genlmsg_cancel(skb, nlh);
+errmsg:
+	return -EMSGSIZE;
+}
+
+int smc_nl_get_fback_stats(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
+	int rc_srv = 0, rc_clnt = 0, k;
+	int skip_serv = cb_ctx->pos[1];
+	int snum = cb_ctx->pos[0];
+	bool is_srv = true;
+
+	mutex_lock(&smc_stat_fback_rsn);
+	for (k = 0; k < SMC_MAX_FBACK_RSN_CNT; k++) {
+		if (k < snum)
+			continue;
+		if (!skip_serv) {
+			rc_srv = smc_nl_get_fback_details(skb, cb, k, is_srv);
+			if (rc_srv && rc_srv != ENODATA)
+				break;
+		} else {
+			skip_serv = 0;
+		}
+		rc_clnt = smc_nl_get_fback_details(skb, cb, k, !is_srv);
+		if (rc_clnt && rc_clnt != ENODATA) {
+			skip_serv = 1;
+			break;
+		}
+		if (rc_clnt == ENODATA && rc_srv == ENODATA)
+			break;
+	}
+	mutex_unlock(&smc_stat_fback_rsn);
+	cb_ctx->pos[1] = skip_serv;
+	cb_ctx->pos[0] = k;
+	return skb->len;
+}
diff --git a/net/smc/smc_stats.h b/net/smc/smc_stats.h
index 84baaca59eaf..7c35b22d9e29 100644
--- a/net/smc/smc_stats.h
+++ b/net/smc/smc_stats.h
@@ -248,6 +248,7 @@ do { \
 while (0)
 
 int smc_nl_get_stats(struct sk_buff *skb, struct netlink_callback *cb);
+int smc_nl_get_fback_stats(struct sk_buff *skb, struct netlink_callback *cb);
 int smc_stats_init(void) __init;
 void smc_stats_exit(void);
 
-- 
2.25.1

[PATCH net-next v2 4/4] net/smc: Make SMC statistics network namespace aware

[Karsten Graul]

From: Guvenc Gulce <guvenc@linux.ibm.com>

Make the gathered SMC statistics network namespace aware, for each
namespace collect an own set of statistic information.

Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
---
 include/net/net_namespace.h |   4 ++
 include/net/netns/smc.h     |  16 ++++++
 net/smc/af_smc.c            |  65 +++++++++++++--------
 net/smc/smc_core.c          |  10 ++--
 net/smc/smc_rx.c            |   6 +-
 net/smc/smc_stats.c         |  47 ++++++++-------
 net/smc/smc_stats.h         | 111 ++++++++++++++++++++----------------
 net/smc/smc_tx.c            |  12 ++--
 8 files changed, 163 insertions(+), 108 deletions(-)
 create mode 100644 include/net/netns/smc.h

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index fa5887143f0d..befc5b93f311 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -32,6 +32,7 @@
 #include <net/netns/mpls.h>
 #include <net/netns/can.h>
 #include <net/netns/xdp.h>
+#include <net/netns/smc.h>
 #include <net/netns/bpf.h>
 #include <linux/ns_common.h>
 #include <linux/idr.h>
@@ -170,6 +171,9 @@ struct net {
 	struct sock		*crypto_nlsk;
 #endif
 	struct sock		*diag_nlsk;
+#if IS_ENABLED(CONFIG_SMC)
+	struct netns_smc	smc;
+#endif
 } __randomize_layout;
 
 #include <linux/seq_file_net.h>
diff --git a/include/net/netns/smc.h b/include/net/netns/smc.h
new file mode 100644
index 000000000000..ea8a9cf2619b
--- /dev/null
+++ b/include/net/netns/smc.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NETNS_SMC_H__
+#define __NETNS_SMC_H__
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+
+struct smc_stats_rsn;
+struct smc_stats;
+struct netns_smc {
+	/* per cpu counters for SMC */
+	struct smc_stats __percpu	*smc_stats;
+	/* protect fback_rsn */
+	struct mutex			mutex_fback_rsn;
+	struct smc_stats_rsn		*fback_rsn;
+};
+#endif
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index efeaed384769..e41fdac606d4 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -529,15 +529,17 @@ static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
 
 static void smc_stat_fallback(struct smc_sock *smc)
 {
-	mutex_lock(&smc_stat_fback_rsn);
+	struct net *net = sock_net(&smc->sk);
+
+	mutex_lock(&net->smc.mutex_fback_rsn);
 	if (smc->listen_smc) {
-		smc_stat_inc_fback_rsn_cnt(smc, fback_rsn.srv);
-		fback_rsn.srv_fback_cnt++;
+		smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
+		net->smc.fback_rsn->srv_fback_cnt++;
 	} else {
-		smc_stat_inc_fback_rsn_cnt(smc, fback_rsn.clnt);
-		fback_rsn.clnt_fback_cnt++;
+		smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
+		net->smc.fback_rsn->clnt_fback_cnt++;
 	}
-	mutex_unlock(&smc_stat_fback_rsn);
+	mutex_unlock(&net->smc.mutex_fback_rsn);
 }
 
 static void smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
@@ -568,10 +570,11 @@ static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 					u8 version)
 {
+	struct net *net = sock_net(&smc->sk);
 	int rc;
 
 	if (reason_code < 0) { /* error, fallback is not possible */
-		this_cpu_inc(smc_stats->clnt_hshake_err_cnt);
+		this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 		if (smc->sk.sk_state == SMC_INIT)
 			sock_put(&smc->sk); /* passive closing */
 		return reason_code;
@@ -579,7 +582,7 @@ static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
 	if (reason_code != SMC_CLC_DECL_PEERDECL) {
 		rc = smc_clc_send_decline(smc, reason_code, version);
 		if (rc < 0) {
-			this_cpu_inc(smc_stats->clnt_hshake_err_cnt);
+			this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
 			if (smc->sk.sk_state == SMC_INIT)
 				sock_put(&smc->sk); /* passive closing */
 			return rc;
@@ -1027,7 +1030,7 @@ static int __smc_connect(struct smc_sock *smc)
 	if (rc)
 		goto vlan_cleanup;
 
-	SMC_STAT_CLNT_SUCC_INC(aclc);
+	SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
 	smc_connect_ism_vlan_cleanup(smc, ini);
 	kfree(buf);
 	kfree(ini);
@@ -1343,8 +1346,9 @@ static void smc_listen_out_connected(struct smc_sock *new_smc)
 static void smc_listen_out_err(struct smc_sock *new_smc)
 {
 	struct sock *newsmcsk = &new_smc->sk;
+	struct net *net = sock_net(newsmcsk);
 
-	this_cpu_inc(smc_stats->srv_hshake_err_cnt);
+	this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
 	if (newsmcsk->sk_state == SMC_INIT)
 		sock_put(&new_smc->sk); /* passive closing */
 	newsmcsk->sk_state = SMC_CLOSED;
@@ -1813,7 +1817,7 @@ static void smc_listen_work(struct work_struct *work)
 	}
 	smc_conn_save_peer_info(new_smc, cclc);
 	smc_listen_out_connected(new_smc);
-	SMC_STAT_SERV_SUCC_INC(ini);
+	SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
 	goto out_free;
 
 out_unlock:
@@ -2242,7 +2246,7 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
 		    sk->sk_state != SMC_LISTEN &&
 		    sk->sk_state != SMC_CLOSED) {
 			if (val) {
-				SMC_STAT_INC(!smc->conn.lnk, ndly_cnt);
+				SMC_STAT_INC(smc, ndly_cnt);
 				mod_delayed_work(smc->conn.lgr->tx_wq,
 						 &smc->conn.tx_work, 0);
 			}
@@ -2253,7 +2257,7 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
 		    sk->sk_state != SMC_LISTEN &&
 		    sk->sk_state != SMC_CLOSED) {
 			if (!val) {
-				SMC_STAT_INC(!smc->conn.lnk, cork_cnt);
+				SMC_STAT_INC(smc, cork_cnt);
 				mod_delayed_work(smc->conn.lgr->tx_wq,
 						 &smc->conn.tx_work, 0);
 			}
@@ -2383,7 +2387,7 @@ static ssize_t smc_sendpage(struct socket *sock, struct page *page,
 		rc = kernel_sendpage(smc->clcsock, page, offset,
 				     size, flags);
 	} else {
-		SMC_STAT_INC(!smc->conn.lnk, sendpage_cnt);
+		SMC_STAT_INC(smc, sendpage_cnt);
 		rc = sock_no_sendpage(sock, page, offset, size, flags);
 	}
 
@@ -2434,7 +2438,7 @@ static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
 			flags = MSG_DONTWAIT;
 		else
 			flags = 0;
-		SMC_STAT_INC(!smc->conn.lnk, splice_cnt);
+		SMC_STAT_INC(smc, splice_cnt);
 		rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
 	}
 out:
@@ -2523,6 +2527,16 @@ static void __net_exit smc_net_exit(struct net *net)
 	smc_pnet_net_exit(net);
 }
 
+static __net_init int smc_net_stat_init(struct net *net)
+{
+	return smc_stats_init(net);
+}
+
+static void __net_exit smc_net_stat_exit(struct net *net)
+{
+	smc_stats_exit(net);
+}
+
 static struct pernet_operations smc_net_ops = {
 	.init = smc_net_init,
 	.exit = smc_net_exit,
@@ -2530,6 +2544,11 @@ static struct pernet_operations smc_net_ops = {
 	.size = sizeof(struct smc_net),
 };
 
+static struct pernet_operations smc_net_stat_ops = {
+	.init = smc_net_stat_init,
+	.exit = smc_net_stat_exit,
+};
+
 static int __init smc_init(void)
 {
 	int rc;
@@ -2538,6 +2557,10 @@ static int __init smc_init(void)
 	if (rc)
 		return rc;
 
+	rc = register_pernet_subsys(&smc_net_stat_ops);
+	if (rc)
+		return rc;
+
 	smc_ism_init();
 	smc_clc_init();
 
@@ -2558,16 +2581,10 @@ static int __init smc_init(void)
 	if (!smc_close_wq)
 		goto out_alloc_hs_wq;
 
-	rc = smc_stats_init();
-	if (rc) {
-		pr_err("%s: smc_stats_init fails with %d\n", __func__, rc);
-		goto out_alloc_wqs;
-	}
-
 	rc = smc_core_init();
 	if (rc) {
 		pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
-		goto out_smc_stat;
+		goto out_alloc_wqs;
 	}
 
 	rc = smc_llc_init();
@@ -2619,8 +2636,6 @@ static int __init smc_init(void)
 	proto_unregister(&smc_proto);
 out_core:
 	smc_core_exit();
-out_smc_stat:
-	smc_stats_exit();
 out_alloc_wqs:
 	destroy_workqueue(smc_close_wq);
 out_alloc_hs_wq:
@@ -2643,11 +2658,11 @@ static void __exit smc_exit(void)
 	smc_ib_unregister_client();
 	destroy_workqueue(smc_close_wq);
 	destroy_workqueue(smc_hs_wq);
-	smc_stats_exit();
 	proto_unregister(&smc_proto6);
 	proto_unregister(&smc_proto);
 	smc_pnet_exit();
 	smc_nl_exit();
+	unregister_pernet_subsys(&smc_net_stat_ops);
 	unregister_pernet_subsys(&smc_net_ops);
 	rcu_barrier();
 }
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index d69f58f670a1..cd0d7c908b2a 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -2058,8 +2058,8 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
 		/* check for reusable slot in the link group */
 		buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
 		if (buf_desc) {
-			SMC_STAT_RMB_SIZE(is_smcd, is_rmb, bufsize);
-			SMC_STAT_BUF_REUSE(is_smcd, is_rmb);
+			SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
+			SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb);
 			memset(buf_desc->cpu_addr, 0, bufsize);
 			break; /* found reusable slot */
 		}
@@ -2074,13 +2074,13 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
 		if (IS_ERR(buf_desc)) {
 			if (!is_dgraded) {
 				is_dgraded = true;
-				SMC_STAT_RMB_DOWNGRADED(is_smcd, is_rmb);
+				SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb);
 			}
 			continue;
 		}
 
-		SMC_STAT_RMB_ALLOC(is_smcd, is_rmb);
-		SMC_STAT_RMB_SIZE(is_smcd, is_rmb, bufsize);
+		SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb);
+		SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
 		buf_desc->used = 1;
 		mutex_lock(lock);
 		list_add(&buf_desc->list, buf_list);
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index ce1ae39923b1..170b733bc736 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -228,7 +228,7 @@ static int smc_rx_recv_urg(struct smc_sock *smc, struct msghdr *msg, int len,
 	    conn->urg_state == SMC_URG_READ)
 		return -EINVAL;
 
-	SMC_STAT_INC(!conn->lnk, urg_data_cnt);
+	SMC_STAT_INC(smc, urg_data_cnt);
 	if (conn->urg_state == SMC_URG_VALID) {
 		if (!(flags & MSG_PEEK))
 			smc->conn.urg_state = SMC_URG_READ;
@@ -307,10 +307,10 @@ int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg,
 
 	readable = atomic_read(&conn->bytes_to_rcv);
 	if (readable >= conn->rmb_desc->len)
-		SMC_STAT_RMB_RX_FULL(!conn->lnk);
+		SMC_STAT_RMB_RX_FULL(smc, !conn->lnk);
 
 	if (len < readable)
-		SMC_STAT_RMB_RX_SIZE_SMALL(!conn->lnk);
+		SMC_STAT_RMB_RX_SIZE_SMALL(smc, !conn->lnk);
 	/* we currently use 1 RMBE per RMB, so RMBE == RMB base addr */
 	rcvbuf_base = conn->rx_off + conn->rmb_desc->cpu_addr;
 
diff --git a/net/smc/smc_stats.c b/net/smc/smc_stats.c
index b3d279d29c52..614013e3b574 100644
--- a/net/smc/smc_stats.c
+++ b/net/smc/smc_stats.c
@@ -18,24 +18,28 @@
 #include "smc_netlink.h"
 #include "smc_stats.h"
 
-/* serialize fallback reason statistic gathering */
-DEFINE_MUTEX(smc_stat_fback_rsn);
-struct smc_stats __percpu *smc_stats;	/* per cpu counters for SMC */
-struct smc_stats_reason fback_rsn;
-
-int __init smc_stats_init(void)
+int smc_stats_init(struct net *net)
 {
-	memset(&fback_rsn, 0, sizeof(fback_rsn));
-	smc_stats = alloc_percpu(struct smc_stats);
-	if (!smc_stats)
-		return -ENOMEM;
-
+	net->smc.fback_rsn = kzalloc(sizeof(*net->smc.fback_rsn), GFP_KERNEL);
+	if (!net->smc.fback_rsn)
+		goto err_fback;
+	net->smc.smc_stats = alloc_percpu(struct smc_stats);
+	if (!net->smc.smc_stats)
+		goto err_stats;
+	mutex_init(&net->smc.mutex_fback_rsn);
 	return 0;
+
+err_stats:
+	kfree(net->smc.fback_rsn);
+err_fback:
+	return -ENOMEM;
 }
 
-void smc_stats_exit(void)
+void smc_stats_exit(struct net *net)
 {
-	free_percpu(smc_stats);
+	kfree(net->smc.fback_rsn);
+	if (net->smc.smc_stats)
+		free_percpu(net->smc.smc_stats);
 }
 
 static int smc_nl_fill_stats_rmb_data(struct sk_buff *skb,
@@ -256,6 +260,7 @@ int smc_nl_get_stats(struct sk_buff *skb,
 		     struct netlink_callback *cb)
 {
 	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
+	struct net *net = sock_net(skb->sk);
 	struct smc_stats *stats;
 	struct nlattr *attrs;
 	int cpu, i, size;
@@ -279,7 +284,7 @@ int smc_nl_get_stats(struct sk_buff *skb,
 		goto erralloc;
 	size = sizeof(*stats) / sizeof(u64);
 	for_each_possible_cpu(cpu) {
-		src = (u64 *)per_cpu_ptr(smc_stats, cpu);
+		src = (u64 *)per_cpu_ptr(net->smc.smc_stats, cpu);
 		sum = (u64 *)stats;
 		for (i = 0; i < size; i++)
 			*(sum++) += *(src++);
@@ -318,6 +323,7 @@ static int smc_nl_get_fback_details(struct sk_buff *skb,
 				    bool is_srv)
 {
 	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
+	struct net *net = sock_net(skb->sk);
 	int cnt_reported = cb_ctx->pos[2];
 	struct smc_stats_fback *trgt_arr;
 	struct nlattr *attrs;
@@ -325,9 +331,9 @@ static int smc_nl_get_fback_details(struct sk_buff *skb,
 	void *nlh;
 
 	if (is_srv)
-		trgt_arr = &fback_rsn.srv[0];
+		trgt_arr = &net->smc.fback_rsn->srv[0];
 	else
-		trgt_arr = &fback_rsn.clnt[0];
+		trgt_arr = &net->smc.fback_rsn->clnt[0];
 	if (!trgt_arr[pos].fback_code)
 		return -ENODATA;
 	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
@@ -342,11 +348,11 @@ static int smc_nl_get_fback_details(struct sk_buff *skb,
 		goto errattr;
 	if (!cnt_reported) {
 		if (nla_put_u64_64bit(skb, SMC_NLA_FBACK_STATS_SRV_CNT,
-				      fback_rsn.srv_fback_cnt,
+				      net->smc.fback_rsn->srv_fback_cnt,
 				      SMC_NLA_FBACK_STATS_PAD))
 			goto errattr;
 		if (nla_put_u64_64bit(skb, SMC_NLA_FBACK_STATS_CLNT_CNT,
-				      fback_rsn.clnt_fback_cnt,
+				      net->smc.fback_rsn->clnt_fback_cnt,
 				      SMC_NLA_FBACK_STATS_PAD))
 			goto errattr;
 		cnt_reported = 1;
@@ -375,12 +381,13 @@ static int smc_nl_get_fback_details(struct sk_buff *skb,
 int smc_nl_get_fback_stats(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
+	struct net *net = sock_net(skb->sk);
 	int rc_srv = 0, rc_clnt = 0, k;
 	int skip_serv = cb_ctx->pos[1];
 	int snum = cb_ctx->pos[0];
 	bool is_srv = true;
 
-	mutex_lock(&smc_stat_fback_rsn);
+	mutex_lock(&net->smc.mutex_fback_rsn);
 	for (k = 0; k < SMC_MAX_FBACK_RSN_CNT; k++) {
 		if (k < snum)
 			continue;
@@ -399,7 +406,7 @@ int smc_nl_get_fback_stats(struct sk_buff *skb, struct netlink_callback *cb)
 		if (rc_clnt == ENODATA && rc_srv == ENODATA)
 			break;
 	}
-	mutex_unlock(&smc_stat_fback_rsn);
+	mutex_unlock(&net->smc.mutex_fback_rsn);
 	cb_ctx->pos[1] = skip_serv;
 	cb_ctx->pos[0] = k;
 	return skb->len;
diff --git a/net/smc/smc_stats.h b/net/smc/smc_stats.h
index 7c35b22d9e29..84b7ecd8c05c 100644
--- a/net/smc/smc_stats.h
+++ b/net/smc/smc_stats.h
@@ -21,10 +21,6 @@
 
 #define SMC_MAX_FBACK_RSN_CNT 30
 
-extern struct smc_stats __percpu *smc_stats;	/* per cpu counters for SMC */
-extern struct smc_stats_reason fback_rsn;
-extern struct mutex smc_stat_fback_rsn;
-
 enum {
 	SMC_BUF_8K,
 	SMC_BUF_16K,
@@ -43,7 +39,7 @@ struct smc_stats_fback {
 	u16	count;
 };
 
-struct smc_stats_reason {
+struct smc_stats_rsn {
 	struct	smc_stats_fback srv[SMC_MAX_FBACK_RSN_CNT];
 	struct	smc_stats_fback clnt[SMC_MAX_FBACK_RSN_CNT];
 	u64			srv_fback_cnt;
@@ -92,122 +88,135 @@ struct smc_stats {
 	u64			srv_hshake_err_cnt;
 };
 
-#define SMC_STAT_PAYLOAD_SUB(_tech, key, _len, _rc) \
+#define SMC_STAT_PAYLOAD_SUB(_smc_stats, _tech, key, _len, _rc) \
 do { \
+	typeof(_smc_stats) stats = (_smc_stats); \
 	typeof(_tech) t = (_tech); \
 	typeof(_len) l = (_len); \
 	int _pos = fls64((l) >> 13); \
 	typeof(_rc) r = (_rc); \
 	int m = SMC_BUF_MAX - 1; \
-	this_cpu_inc((*smc_stats).smc[t].key ## _cnt); \
+	this_cpu_inc((*stats).smc[t].key ## _cnt); \
 	if (r <= 0) \
 		break; \
 	_pos = (_pos < m) ? ((l == 1 << (_pos + 12)) ? _pos - 1 : _pos) : m; \
-	this_cpu_inc((*smc_stats).smc[t].key ## _pd.buf[_pos]); \
-	this_cpu_add((*smc_stats).smc[t].key ## _bytes, r); \
+	this_cpu_inc((*stats).smc[t].key ## _pd.buf[_pos]); \
+	this_cpu_add((*stats).smc[t].key ## _bytes, r); \
 } \
 while (0)
 
 #define SMC_STAT_TX_PAYLOAD(_smc, length, rcode) \
 do { \
 	typeof(_smc) __smc = _smc; \
+	struct net *_net = sock_net(&__smc->sk); \
+	struct smc_stats __percpu *_smc_stats = _net->smc.smc_stats; \
 	typeof(length) _len = (length); \
 	typeof(rcode) _rc = (rcode); \
 	bool is_smcd = !__smc->conn.lnk; \
 	if (is_smcd) \
-		SMC_STAT_PAYLOAD_SUB(SMC_TYPE_D, tx, _len, _rc); \
+		SMC_STAT_PAYLOAD_SUB(_smc_stats, SMC_TYPE_D, tx, _len, _rc); \
 	else \
-		SMC_STAT_PAYLOAD_SUB(SMC_TYPE_R, tx, _len, _rc); \
+		SMC_STAT_PAYLOAD_SUB(_smc_stats, SMC_TYPE_R, tx, _len, _rc); \
 } \
 while (0)
 
 #define SMC_STAT_RX_PAYLOAD(_smc, length, rcode) \
 do { \
 	typeof(_smc) __smc = _smc; \
+	struct net *_net = sock_net(&__smc->sk); \
+	struct smc_stats __percpu *_smc_stats = _net->smc.smc_stats; \
 	typeof(length) _len = (length); \
 	typeof(rcode) _rc = (rcode); \
 	bool is_smcd = !__smc->conn.lnk; \
 	if (is_smcd) \
-		SMC_STAT_PAYLOAD_SUB(SMC_TYPE_D, rx, _len, _rc); \
+		SMC_STAT_PAYLOAD_SUB(_smc_stats, SMC_TYPE_D, rx, _len, _rc); \
 	else \
-		SMC_STAT_PAYLOAD_SUB(SMC_TYPE_R, rx, _len, _rc); \
+		SMC_STAT_PAYLOAD_SUB(_smc_stats, SMC_TYPE_R, rx, _len, _rc); \
 } \
 while (0)
 
-#define SMC_STAT_RMB_SIZE_SUB(_tech, k, _len) \
+#define SMC_STAT_RMB_SIZE_SUB(_smc_stats, _tech, k, _len) \
 do { \
 	typeof(_len) _l = (_len); \
 	typeof(_tech) t = (_tech); \
 	int _pos = fls((_l) >> 13); \
 	int m = SMC_BUF_MAX - 1; \
 	_pos = (_pos < m) ? ((_l == 1 << (_pos + 12)) ? _pos - 1 : _pos) : m; \
-	this_cpu_inc((*smc_stats).smc[t].k ## _rmbsize.buf[_pos]); \
+	this_cpu_inc((*(_smc_stats)).smc[t].k ## _rmbsize.buf[_pos]); \
 } \
 while (0)
 
-#define SMC_STAT_RMB_SUB(type, t, key) \
-	this_cpu_inc((*smc_stats).smc[t].rmb ## _ ## key.type ## _cnt)
+#define SMC_STAT_RMB_SUB(_smc_stats, type, t, key) \
+	this_cpu_inc((*(_smc_stats)).smc[t].rmb ## _ ## key.type ## _cnt)
 
-#define SMC_STAT_RMB_SIZE(_is_smcd, _is_rx, _len) \
+#define SMC_STAT_RMB_SIZE(_smc, _is_smcd, _is_rx, _len) \
 do { \
+	struct net *_net = sock_net(&(_smc)->sk); \
+	struct smc_stats __percpu *_smc_stats = _net->smc.smc_stats; \
 	typeof(_is_smcd) is_d = (_is_smcd); \
 	typeof(_is_rx) is_r = (_is_rx); \
 	typeof(_len) l = (_len); \
 	if ((is_d) && (is_r)) \
-		SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_D, rx, l); \
+		SMC_STAT_RMB_SIZE_SUB(_smc_stats, SMC_TYPE_D, rx, l); \
 	if ((is_d) && !(is_r)) \
-		SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_D, tx, l); \
+		SMC_STAT_RMB_SIZE_SUB(_smc_stats, SMC_TYPE_D, tx, l); \
 	if (!(is_d) && (is_r)) \
-		SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_R, rx, l); \
+		SMC_STAT_RMB_SIZE_SUB(_smc_stats, SMC_TYPE_R, rx, l); \
 	if (!(is_d) && !(is_r)) \
-		SMC_STAT_RMB_SIZE_SUB(SMC_TYPE_R, tx, l); \
+		SMC_STAT_RMB_SIZE_SUB(_smc_stats, SMC_TYPE_R, tx, l); \
 } \
 while (0)
 
-#define SMC_STAT_RMB(type, _is_smcd, _is_rx) \
+#define SMC_STAT_RMB(_smc, type, _is_smcd, _is_rx) \
 do { \
+	struct net *net = sock_net(&(_smc)->sk); \
+	struct smc_stats __percpu *_smc_stats = net->smc.smc_stats; \
 	typeof(_is_smcd) is_d = (_is_smcd); \
 	typeof(_is_rx) is_r = (_is_rx); \
 	if ((is_d) && (is_r)) \
-		SMC_STAT_RMB_SUB(type, SMC_TYPE_D, rx); \
+		SMC_STAT_RMB_SUB(_smc_stats, type, SMC_TYPE_D, rx); \
 	if ((is_d) && !(is_r)) \
-		SMC_STAT_RMB_SUB(type, SMC_TYPE_D, tx); \
+		SMC_STAT_RMB_SUB(_smc_stats, type, SMC_TYPE_D, tx); \
 	if (!(is_d) && (is_r)) \
-		SMC_STAT_RMB_SUB(type, SMC_TYPE_R, rx); \
+		SMC_STAT_RMB_SUB(_smc_stats, type, SMC_TYPE_R, rx); \
 	if (!(is_d) && !(is_r)) \
-		SMC_STAT_RMB_SUB(type, SMC_TYPE_R, tx); \
+		SMC_STAT_RMB_SUB(_smc_stats, type, SMC_TYPE_R, tx); \
 } \
 while (0)
 
-#define SMC_STAT_BUF_REUSE(is_smcd, is_rx) \
-	SMC_STAT_RMB(reuse, is_smcd, is_rx)
+#define SMC_STAT_BUF_REUSE(smc, is_smcd, is_rx) \
+	SMC_STAT_RMB(smc, reuse, is_smcd, is_rx)
 
-#define SMC_STAT_RMB_ALLOC(is_smcd, is_rx) \
-	SMC_STAT_RMB(alloc, is_smcd, is_rx)
+#define SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rx) \
+	SMC_STAT_RMB(smc, alloc, is_smcd, is_rx)
 
-#define SMC_STAT_RMB_DOWNGRADED(is_smcd, is_rx) \
-	SMC_STAT_RMB(dgrade, is_smcd, is_rx)
+#define SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rx) \
+	SMC_STAT_RMB(smc, dgrade, is_smcd, is_rx)
 
-#define SMC_STAT_RMB_TX_PEER_FULL(is_smcd) \
-	SMC_STAT_RMB(buf_full_peer, is_smcd, false)
+#define SMC_STAT_RMB_TX_PEER_FULL(smc, is_smcd) \
+	SMC_STAT_RMB(smc, buf_full_peer, is_smcd, false)
 
-#define SMC_STAT_RMB_TX_FULL(is_smcd) \
-	SMC_STAT_RMB(buf_full, is_smcd, false)
+#define SMC_STAT_RMB_TX_FULL(smc, is_smcd) \
+	SMC_STAT_RMB(smc, buf_full, is_smcd, false)
 
-#define SMC_STAT_RMB_TX_PEER_SIZE_SMALL(is_smcd) \
-	SMC_STAT_RMB(buf_size_small_peer, is_smcd, false)
+#define SMC_STAT_RMB_TX_PEER_SIZE_SMALL(smc, is_smcd) \
+	SMC_STAT_RMB(smc, buf_size_small_peer, is_smcd, false)
 
-#define SMC_STAT_RMB_TX_SIZE_SMALL(is_smcd) \
-	SMC_STAT_RMB(buf_size_small, is_smcd, false)
+#define SMC_STAT_RMB_TX_SIZE_SMALL(smc, is_smcd) \
+	SMC_STAT_RMB(smc, buf_size_small, is_smcd, false)
 
-#define SMC_STAT_RMB_RX_SIZE_SMALL(is_smcd) \
-	SMC_STAT_RMB(buf_size_small, is_smcd, true)
+#define SMC_STAT_RMB_RX_SIZE_SMALL(smc, is_smcd) \
+	SMC_STAT_RMB(smc, buf_size_small, is_smcd, true)
 
-#define SMC_STAT_RMB_RX_FULL(is_smcd) \
-	SMC_STAT_RMB(buf_full, is_smcd, true)
+#define SMC_STAT_RMB_RX_FULL(smc, is_smcd) \
+	SMC_STAT_RMB(smc, buf_full, is_smcd, true)
 
-#define SMC_STAT_INC(is_smcd, type) \
+#define SMC_STAT_INC(_smc, type) \
 do { \
+	typeof(_smc) __smc = _smc; \
+	bool is_smcd = !(__smc)->conn.lnk; \
+	struct net *net = sock_net(&(__smc)->sk); \
+	struct smc_stats __percpu *smc_stats = net->smc.smc_stats; \
 	if ((is_smcd)) \
 		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].type); \
 	else \
@@ -215,11 +224,12 @@ do { \
 } \
 while (0)
 
-#define SMC_STAT_CLNT_SUCC_INC(_aclc) \
+#define SMC_STAT_CLNT_SUCC_INC(net, _aclc) \
 do { \
 	typeof(_aclc) acl = (_aclc); \
 	bool is_v2 = (acl->hdr.version == SMC_V2); \
 	bool is_smcd = (acl->hdr.typev1 == SMC_TYPE_D); \
+	struct smc_stats __percpu *smc_stats = (net)->smc.smc_stats; \
 	if (is_v2 && is_smcd) \
 		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].clnt_v2_succ_cnt); \
 	else if (is_v2 && !is_smcd) \
@@ -231,11 +241,12 @@ do { \
 } \
 while (0)
 
-#define SMC_STAT_SERV_SUCC_INC(_ini) \
+#define SMC_STAT_SERV_SUCC_INC(net, _ini) \
 do { \
 	typeof(_ini) i = (_ini); \
 	bool is_v2 = (i->smcd_version & SMC_V2); \
 	bool is_smcd = (i->is_smcd); \
+	typeof(net->smc.smc_stats) smc_stats = (net)->smc.smc_stats; \
 	if (is_v2 && is_smcd) \
 		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].srv_v2_succ_cnt); \
 	else if (is_v2 && !is_smcd) \
@@ -249,7 +260,7 @@ while (0)
 
 int smc_nl_get_stats(struct sk_buff *skb, struct netlink_callback *cb);
 int smc_nl_get_fback_stats(struct sk_buff *skb, struct netlink_callback *cb);
-int smc_stats_init(void) __init;
-void smc_stats_exit(void);
+int smc_stats_init(struct net *net);
+void smc_stats_exit(struct net *net);
 
 #endif /* NET_SMC_SMC_STATS_H_ */
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index a043544d715f..075c4f4b41cf 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -47,7 +47,7 @@ static void smc_tx_write_space(struct sock *sk)
 	/* similar to sk_stream_write_space */
 	if (atomic_read(&smc->conn.sndbuf_space) && sock) {
 		if (test_bit(SOCK_NOSPACE, &sock->flags))
-			SMC_STAT_RMB_TX_FULL(!smc->conn.lnk);
+			SMC_STAT_RMB_TX_FULL(smc, !smc->conn.lnk);
 		clear_bit(SOCK_NOSPACE, &sock->flags);
 		rcu_read_lock();
 		wq = rcu_dereference(sk->sk_wq);
@@ -155,13 +155,13 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 	}
 
 	if (len > conn->sndbuf_desc->len)
-		SMC_STAT_RMB_TX_SIZE_SMALL(!conn->lnk);
+		SMC_STAT_RMB_TX_SIZE_SMALL(smc, !conn->lnk);
 
 	if (len > conn->peer_rmbe_size)
-		SMC_STAT_RMB_TX_PEER_SIZE_SMALL(!conn->lnk);
+		SMC_STAT_RMB_TX_PEER_SIZE_SMALL(smc, !conn->lnk);
 
 	if (msg->msg_flags & MSG_OOB)
-		SMC_STAT_INC(!conn->lnk, urg_data_cnt);
+		SMC_STAT_INC(smc, urg_data_cnt);
 
 	while (msg_data_left(msg)) {
 		if (sk->sk_state == SMC_INIT)
@@ -432,7 +432,9 @@ static int smc_tx_rdma_writes(struct smc_connection *conn,
 	/* cf. snd_wnd */
 	rmbespace = atomic_read(&conn->peer_rmbe_space);
 	if (rmbespace <= 0) {
-		SMC_STAT_RMB_TX_PEER_FULL(!conn->lnk);
+		struct smc_sock *smc = container_of(conn, struct smc_sock,
+						    conn);
+		SMC_STAT_RMB_TX_PEER_FULL(smc, !conn->lnk);
 		return 0;
 	}
 	smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
-- 
2.25.1

Re: [PATCH net-next v2 0/4] net/smc: Add SMC statistic support

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Wed, 16 Jun 2021 16:52:54 +0200 you wrote:
> Please apply the following patch series for smc to netdev's net-next tree.
> 
> This v2 is a resend of the code contained in v1 but with an updated
> cover letter to describe why we have chosen to use the generic netlink
> mechanism to access the smc protocol's statistic data.
> 
> The patchset adds statistic support to the SMC protocol. Per-cpu
> variables are used to collect the statistic information for better
> performance and for reducing concurrency pitfalls. The code that is
> collecting statistic data is implemented in macros to increase code
> reuse and readability.
> The generic netlink mechanism in SMC is extended to provide the
> collected statistics to userspace.
> Network namespace awareness is also part of the statistics
> implementation.
> 
> [...]

Here is the summary with links:
  - [net-next,v2,1/4] net/smc: Add SMC statistics support
    https://git.kernel.org/netdev/net-next/c/e0e4b8fa5338
  - [net-next,v2,2/4] net/smc: Add netlink support for SMC statistics
    https://git.kernel.org/netdev/net-next/c/8c40602b4be1
  - [net-next,v2,3/4] net/smc: Add netlink support for SMC fallback statistics
    https://git.kernel.org/netdev/net-next/c/f0dd7bf5e330
  - [net-next,v2,4/4] net/smc: Make SMC statistics network namespace aware
    https://git.kernel.org/netdev/net-next/c/194730a9beb5

You are awesome, thank you!
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