octeon_ep_vf: add ethtool support

Add support for the following ethtool commands:

ethtool -i|--driver devname
ethtool devname
ethtool -S|--statistics devname
Signed-off-by: Shinas Rasheed <srasheed@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeon_ep_vf/Makefile

@@ -6,4 +6,5 @@
 obj-$(CONFIG_OCTEON_EP_VF) += octeon_ep_vf.o
 
 octeon_ep_vf-y := octep_vf_main.o octep_vf_cn9k.o octep_vf_cnxk.o \
-		  octep_vf_tx.o octep_vf_rx.o octep_vf_mbox.o
+		  octep_vf_tx.o octep_vf_rx.o octep_vf_mbox.o \
+		  octep_vf_ethtool.o

drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c

@@ -1081,6 +1081,7 @@ static int octep_vf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	INIT_WORK(&octep_vf_dev->tx_timeout_task, octep_vf_tx_timeout_task);
 
 	netdev->netdev_ops = &octep_vf_netdev_ops;
+	octep_vf_set_ethtool_ops(netdev);
 	netif_carrier_off(netdev);
 
 	if (octep_vf_setup_mbox(octep_vf_dev)) {

drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.h

@@ -331,6 +331,7 @@ void octep_vf_device_setup_cn93(struct octep_vf_device *oct);
 void octep_vf_device_setup_cnxk(struct octep_vf_device *oct);
 int octep_vf_iq_process_completions(struct octep_vf_iq *iq, u16 budget);
 int octep_vf_oq_process_rx(struct octep_vf_oq *oq, int budget);
+void octep_vf_set_ethtool_ops(struct net_device *netdev);
 int octep_vf_get_link_info(struct octep_vf_device *oct);
 int octep_vf_get_if_stats(struct octep_vf_device *oct);
 void octep_vf_mbox_work(struct work_struct *work);

drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_mbox.c

@@ -114,7 +114,7 @@ static int __octep_vf_mbox_send_cmd(struct octep_vf_device *oct,
 {
 	struct octep_vf_mbox *mbox = oct->mbox;
 	u64 reg_val = 0ull;
-	int count;
+	int count = 0;
 
 	if (!mbox)
 		return OCTEP_PFVF_MBOX_CMD_STATUS_NOT_SETUP;