ksmbd: detect RDMA capable lower devices when bridge and vlan netdev is used

If user set bridge interface as actual RDMA-capable NICs are lower devices,
ksmbd can not detect as RDMA capable. This patch can detect the RDMA
capable lower devices from bridge master or VLAN. With this change, ksmbd
can accept both TCP and RDMA connections through the same bridge IP
address, allowing mixed transport operation without requiring separate
interfaces.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/server/transport_rdma.c b/fs/smb/server/transport_rdma.c
index 7d86553fcc7cdc0c9b256d828e243091eba47425..4a8aeb1df0ccbe7b18ddb4602a228699a73ba4a9 100644 (file)
--- a/fs/smb/server/transport_rdma.c
+++ b/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 +2648,24 @@ out:
        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;
+
+       return false;
+}
+
 static const struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops = {
        .prepare        = smb_direct_prepare,
        .disconnect     = smb_direct_disconnect,