MFC ixgbe cummulative patch from stable/8

217712  Fix a couple of incorrect variable names in the sysctl code.
217713  - Panic on the 82598 adapter due to reading FCOE registers that don't exit
        - Make phy detection dynamic so adapters that support multiple types of
          media can be properly identified by the interface layer
        - Performance patch to the flow director (ixgbe_atr) code
        - Fix intermittent data corruption on the 82599
        - Add missing support code for buffer size and descriptors when doing
          jumbo frames, also add 16K cluster support.
        - Release RX lock when calling stack, this removes LOR problems.
217795  Remove TX_UNLOCK from the error path in local_timer, there is no LOCK
217796  Add missing case for Direct Attach 82598 in the dynamic phy detection
217797  Performance: don't run flow control shared code if nothing has changed

Approved by:  re (bz)

sys/dev/ixgbe/ixgbe.h

@@ -385,6 +385,7 @@ struct adapter {
 	int			advertise;  /* link speeds */
 	bool			link_active;
 	u16			max_frame_size;
+	u16			num_segs;
 	u32			link_speed;
 	bool			link_up;
 	u32 			linkvec;