nfp: make sure debug accesses don't depend on netdevs

We want to be able to inspect the state of descriptor rings of
the control vNIC, so it will use the same interface as data vNICs.

Make sure the code doesn't use netdevs to determine state
of the rings and names things appropriately.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfp_net.h

@@ -805,6 +805,17 @@ static inline u32 nfp_qcp_wr_ptr_read(u8 __iomem *q)
 	return _nfp_qcp_read(q, NFP_QCP_WRITE_PTR);
 }
 
+static inline bool nfp_net_is_data_vnic(struct nfp_net *nn)
+{
+	WARN_ON_ONCE(!nn->dp.netdev && nn->port);
+	return !!nn->dp.netdev;
+}
+
+static inline bool nfp_net_running(struct nfp_net *nn)
+{
+	return nn->dp.ctrl & NFP_NET_CFG_CTRL_ENABLE;
+}
+
 /* Globals */
 extern const char nfp_driver_version[];
 

drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c

@@ -54,7 +54,7 @@ static int nfp_net_debugfs_rx_q_read(struct seq_file *file, void *data)
 		goto out;
 	nn = r_vec->nfp_net;
 	rx_ring = r_vec->rx_ring;
-	if (!netif_running(nn->dp.netdev))
+	if (!nfp_net_running(nn))
 		goto out;
 
 	rxd_cnt = rx_ring->cnt;
@@ -138,7 +138,7 @@ static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
 	if (!r_vec->nfp_net || !tx_ring)
 		goto out;
 	nn = r_vec->nfp_net;
-	if (!netif_running(nn->dp.netdev))
+	if (!nfp_net_running(nn))
 		goto out;
 
 	txd_cnt = tx_ring->cnt;
@@ -209,7 +209,10 @@ void nfp_net_debugfs_vnic_add(struct nfp_net *nn, struct dentry *ddir, int id)
 	if (IS_ERR_OR_NULL(nfp_dir))
 		return;
 
-	sprintf(name, "vnic%d", id);
+	if (nfp_net_is_data_vnic(nn))
+		sprintf(name, "vnic%d", id);
+	else
+		strcpy(name, "ctrl-vnic");
 	nn->debugfs_dir = debugfs_create_dir(name, ddir);
 	if (IS_ERR_OR_NULL(nn->debugfs_dir))
 		return;