Merge tag 'v6.18-rc4-smb-server-fixes' of git://git.samba.org/ksmbd

Pull smb server fixes from Steve French:

 - More safely detect RDMA capable devices correctly

* tag 'v6.18-rc4-smb-server-fixes' of git://git.samba.org/ksmbd:
  ksmbd: detect RDMA capable netdevs include IPoIB
  ksmbd: detect RDMA capable lower devices when bridge and vlan netdev is used

Author: torvalds

fs/smb/server/transport_rdma.c

@@ -2606,7 +2606,7 @@ void ksmbd_rdma_destroy(void)
 	}
 }
 
-bool ksmbd_rdma_capable_netdev(struct net_device *netdev)
+static bool ksmbd_find_rdma_capable_netdev(struct net_device *netdev)
 {
 	struct smb_direct_device *smb_dev;
 	int i;
@@ -2648,6 +2648,28 @@ bool ksmbd_rdma_capable_netdev(struct net_device *netdev)
 	return rdma_capable;
 }
 
+bool ksmbd_rdma_capable_netdev(struct net_device *netdev)
+{
+	struct net_device *lower_dev;
+	struct list_head *iter;
+
+	if (ksmbd_find_rdma_capable_netdev(netdev))
+		return true;
+
+	/* check if netdev is bridge or VLAN */
+	if (netif_is_bridge_master(netdev) ||
+	    netdev->priv_flags & IFF_802_1Q_VLAN)
+		netdev_for_each_lower_dev(netdev, lower_dev, iter)
+			if (ksmbd_find_rdma_capable_netdev(lower_dev))
+				return true;
+
+	/* check if netdev is IPoIB safely without layer violation */
+	if (netdev->type == ARPHRD_INFINIBAND)
+		return true;
+
+	return false;
+}
+
 static const struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops = {
 	.prepare	= smb_direct_prepare,
 	.disconnect	= smb_direct_disconnect,