ixgbe: Disable Flow Control for certain devices

Flow Control autoneg should be disabled for certain adapters that don't support autonegotiation of Flow Control at 10 gigabit. These interfaces are the 10GBASE-T devices, CX4, and SFP+, all running at 10 gigabit only. 1 gigabit is fine. Signed-off-by: Peter P Waskiewicz Jr <[email protected]> Signed-off-by: Jeff Kirsher <[email protected]> Signed-off-by: David S. Miller <[email protected]>
jimmycarry · Nov 29, 2009 · 9bbe3a5 · 9bbe3a5
1 parent cfb3f91
commit 9bbe3a5
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
@@ -1783,6 +1783,20 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
 		}
 	}
 
+	/*
+	 * Bail out on
+	 * - copper or CX4 adapters
+	 * - fiber adapters running at 10gig
+	 */
+	if ((hw->phy.media_type == ixgbe_media_type_copper) ||
+	     (hw->phy.media_type == ixgbe_media_type_cx4) ||
+	     ((hw->phy.media_type == ixgbe_media_type_fiber) &&
+	     (speed == IXGBE_LINK_SPEED_10GB_FULL))) {
+		hw->fc.fc_was_autonegged = false;
+		hw->fc.current_mode = hw->fc.requested_mode;
+		goto out;
+	}
+
 	/*
 	 * Read the AN advertisement and LP ability registers and resolve
 	 * local flow control settings accordingly