e1000: Display Flow Control setting used after link negotiation

No part of e1000 was reporting which Fc settings were effectively
negotiated with the link partner so that it would be impossible
to know if FC was actually used at all.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index ce0d35f..ff7f396 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2426,15 +2426,22 @@ e1000_watchdog(unsigned long data)
 
 	if (link) {
 		if (!netif_carrier_ok(netdev)) {
+			uint32_t ctrl;
 			boolean_t txb2b = 1;
 			e1000_get_speed_and_duplex(&adapter->hw,
 			                           &adapter->link_speed,
 			                           &adapter->link_duplex);
 
-			DPRINTK(LINK, INFO, "NIC Link is Up %d Mbps %s\n",
+			ctrl = E1000_READ_REG(&adapter->hw, CTRL);
+			DPRINTK(LINK, INFO, "NIC Link is Up %d Mbps %s, "
+			       "Flow Control: %s\n",
 			       adapter->link_speed,
 			       adapter->link_duplex == FULL_DUPLEX ?
-			       "Full Duplex" : "Half Duplex");
+			       "Full Duplex" : "Half Duplex",
+			       ((ctrl & E1000_CTRL_TFCE) && (ctrl &
+			       E1000_CTRL_RFCE)) ? "RX/TX" : ((ctrl &
+			       E1000_CTRL_RFCE) ? "RX" : ((ctrl &
+			       E1000_CTRL_TFCE) ? "TX" : "None" )));
 
 			/* tweak tx_queue_len according to speed/duplex
 			 * and adjust the timeout factor */