octeontx2-pf: Disable packet I/O for graceful exit

At the stage of enabling packet I/O in otx2_open, If mailbox
timeout occurs then interface ends up in down state where as
hardware packet I/O is enabled. Hence disable packet I/O also
before bailing out.

Fixes: 1ea0166 ("octeontx2-pf: Fix the device state on error")
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Sai Krishna <saikrishnag@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Subbaraya Sundeep

drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c

@@ -1835,13 +1835,22 @@ int otx2_open(struct net_device *netdev)
 		otx2_dmacflt_reinstall_flows(pf);
 
 	err = otx2_rxtx_enable(pf, true);
-	if (err)
+	/* If a mbox communication error happens at this point then interface
+	 * will end up in a state such that it is in down state but hardware
+	 * mcam entries are enabled to receive the packets. Hence disable the
+	 * packet I/O.
+	 */
+	if (err == EIO)
+		goto err_disable_rxtx;
+	else if (err)
 		goto err_tx_stop_queues;
 
 	otx2_do_set_rx_mode(pf);
 
 	return 0;
 
+err_disable_rxtx:
+	otx2_rxtx_enable(pf, false);
 err_tx_stop_queues:
 	netif_tx_stop_all_queues(netdev);
 	netif_carrier_off(netdev);