[PATCH 5.9 480/757] RDMA/ipoib: Set rtnl_link_ops for ipoib interfaces

[Greg Kroah-Hartman]

From: Kamal Heib <kamalheib1@xxxxxxxxx>

[ Upstream commit 5ce2dced8e95e76ff7439863a118a053a7fc6f91 ]

Report the "ipoib pkey", "mode" and "umcast" netlink attributes for every
IPoiB interface type, not just children created with 'ip link add'.

After setting the rtnl_link_ops for the parent interface, implement the
dellink() callback to block users from trying to remove it.

Fixes: 862096a8bbf8 ("IB/ipoib: Add more rtnl_link_ops callbacks")
Link: https://lore.kernel.org/r/20201004132948.26669-1-kamalheib1@xxxxxxxxx
Signed-off-by: Kamal Heib <kamalheib1@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/infiniband/ulp/ipoib/ipoib_main.c    |  2 ++
 drivers/infiniband/ulp/ipoib/ipoib_netlink.c | 11 +++++++++++
 drivers/infiniband/ulp/ipoib/ipoib_vlan.c    |  2 ++
 3 files changed, 15 insertions(+)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index f772fe8c5b663..abfab89423f41 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -2480,6 +2480,8 @@ static struct net_device *ipoib_add_port(const char *format,
 	/* call event handler to ensure pkey in sync */
 	queue_work(ipoib_workqueue, &priv->flush_heavy);
 
+	ndev->rtnl_link_ops = ipoib_get_link_ops();
+
 	result = register_netdev(ndev);
 	if (result) {
 		pr_warn("%s: couldn't register ipoib port %d; error %d\n",
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c
index 38c984d16996d..d5a90a66b45cf 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c
@@ -144,6 +144,16 @@ static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
 	return 0;
 }
 
+static void ipoib_del_child_link(struct net_device *dev, struct list_head *head)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	if (!priv->parent)
+		return;
+
+	unregister_netdevice_queue(dev, head);
+}
+
 static size_t ipoib_get_size(const struct net_device *dev)
 {
 	return nla_total_size(2) +	/* IFLA_IPOIB_PKEY   */
@@ -158,6 +168,7 @@ static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
 	.priv_size	= sizeof(struct ipoib_dev_priv),
 	.setup		= ipoib_setup_common,
 	.newlink	= ipoib_new_child_link,
+	.dellink	= ipoib_del_child_link,
 	.changelink	= ipoib_changelink,
 	.get_size	= ipoib_get_size,
 	.fill_info	= ipoib_fill_info,
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
index 30865605e0980..4c50a87ed7cc2 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -195,6 +195,8 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
 	}
 	priv = ipoib_priv(ndev);
 
+	ndev->rtnl_link_ops = ipoib_get_link_ops();
+
 	result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
 
 	if (result && ndev->reg_state == NETREG_UNINITIALIZED)
-- 
2.25.1