netdev - [PATCH net-next v4 05/15] net/smc: Add diagnostic information to smc ib-device

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Message-Id: <20201109151814.15040-6-kgraul@linux.ibm.com>
Date:   Mon,  9 Nov 2020 16:18:04 +0100
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        hca@...ux.ibm.com, raspl@...ux.ibm.com
Subject: [PATCH net-next v4 05/15] net/smc: Add diagnostic information to smc ib-device

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

During smc ib-device creation, add network device name to smc
ib-device structure. Register for netdevice name changes and
update ib-device accordingly. This is needed for diagnostic purposes.

Signed-off-by: Guvenc Gulce <guvenc@...ux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
---
 net/smc/smc_ib.c   | 45 +++++++++++++++++++++++++++++++++++++++++++++
 net/smc/smc_ib.h   |  2 ++
 net/smc/smc_pnet.c |  3 +++
 3 files changed, 50 insertions(+)

diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
index 1c314dbdc7fa..300cca9296be 100644
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -557,6 +557,50 @@ static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
 
 static struct ib_client smc_ib_client;
 
+static void smc_copy_netdev_name(struct smc_ib_device *smcibdev, int port)
+{
+	struct ib_device *ibdev = smcibdev->ibdev;
+	struct net_device *ndev;
+
+	if (!ibdev->ops.get_netdev)
+		return;
+	ndev = ibdev->ops.get_netdev(ibdev, port + 1);
+	if (ndev) {
+		snprintf(smcibdev->netdev[port],
+			 sizeof(smcibdev->netdev[port]),
+			 "%s", ndev->name);
+		dev_put(ndev);
+	}
+}
+
+void smc_ib_ndev_name_change(struct net_device *ndev)
+{
+	struct smc_ib_device *smcibdev;
+	struct ib_device *libdev;
+	struct net_device *lndev;
+	u8 port_cnt;
+	int i;
+
+	mutex_lock(&smc_ib_devices.mutex);
+	list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
+		port_cnt = smcibdev->ibdev->phys_port_cnt;
+		for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
+			libdev = smcibdev->ibdev;
+			if (!libdev->ops.get_netdev)
+				continue;
+			lndev = libdev->ops.get_netdev(libdev, i + 1);
+			if (lndev)
+				dev_put(lndev);
+			if (lndev != ndev)
+				continue;
+			snprintf(smcibdev->netdev[i],
+				 sizeof(smcibdev->netdev[i]),
+				 "%s", ndev->name);
+		}
+	}
+	mutex_unlock(&smc_ib_devices.mutex);
+}
+
 /* callback function for ib_register_client() */
 static int smc_ib_add_dev(struct ib_device *ibdev)
 {
@@ -596,6 +640,7 @@ static int smc_ib_add_dev(struct ib_device *ibdev)
 		if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
 					   smcibdev->pnetid[i]))
 			smc_pnetid_by_table_ib(smcibdev, i + 1);
+		smc_copy_netdev_name(smcibdev, i);
 		pr_warn_ratelimited("smc:    ib device %s port %d has pnetid "
 				    "%.16s%s\n",
 				    smcibdev->ibdev->name, i + 1,
diff --git a/net/smc/smc_ib.h b/net/smc/smc_ib.h
index 3b85360a473b..5319496adea0 100644
--- a/net/smc/smc_ib.h
+++ b/net/smc/smc_ib.h
@@ -55,11 +55,13 @@ struct smc_ib_device {				/* ib-device infos for smc */
 	struct mutex		mutex;		/* protect dev setup+cleanup */
 	atomic_t		lnk_cnt_by_port[SMC_MAX_PORTS];
 						/* number of links per port */
+	char			netdev[SMC_MAX_PORTS][IFNAMSIZ];/* ndev names */
 };
 
 struct smc_buf_desc;
 struct smc_link;
 
+void smc_ib_ndev_name_change(struct net_device *ndev);
 int smc_ib_register_client(void) __init;
 void smc_ib_unregister_client(void);
 bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport);
diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
index f3c18b991d35..b0f40d73afd6 100644
--- a/net/smc/smc_pnet.c
+++ b/net/smc/smc_pnet.c
@@ -828,6 +828,9 @@ static int smc_pnet_netdev_event(struct notifier_block *this,
 	case NETDEV_UNREGISTER:
 		smc_pnet_remove_by_ndev(event_dev);
 		return NOTIFY_OK;
+	case NETDEV_CHANGENAME:
+		smc_ib_ndev_name_change(event_dev);
+		return NOTIFY_OK;
 	case NETDEV_REGISTER:
 		smc_pnet_add_by_ndev(event_dev);
 		return NOTIFY_OK;
-- 
2.17.1