ixgb: add tx timeout counter

This adds a TX timeout counter to the ethtool stats, a tx timeout
debug message, and sets the timer to 5 seconds.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>

diff --git a/drivers/net/ixgb/ixgb_ethtool.c b/drivers/net/ixgb/ixgb_ethtool.c
index 560b4b6..6d8192f 100644
--- a/drivers/net/ixgb/ixgb_ethtool.c
+++ b/drivers/net/ixgb/ixgb_ethtool.c
@@ -78,6 +78,7 @@
 	{"tx_heartbeat_errors", IXGB_STAT(net_stats.tx_heartbeat_errors)},
 	{"tx_window_errors", IXGB_STAT(net_stats.tx_window_errors)},
 	{"tx_deferred_ok", IXGB_STAT(stats.dc)},
+	{"tx_timeout_count", IXGB_STAT(tx_timeout_count) },
 	{"rx_long_length_errors", IXGB_STAT(stats.roc)},
 	{"rx_short_length_errors", IXGB_STAT(stats.ruc)},
 #ifdef NETIF_F_TSO