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 <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index 40ff120..f42a954 100644
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -1784,6 +1784,20 @@
}
/*
+ * 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
*/