sfc_ef100: register accesses on EF100

EF100 adds a few new valid addresses for efx_writed_page(), as well as
 a Function Control Window in the BAR whose location is variable.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/net_driver.h

@@ -964,6 +964,7 @@ struct efx_async_filter_insertion {
  * @xdp_rxq_info_failed: Have any of the rx queues failed to initialise their
  *      xdp_rxq_info structures?
  * @mem_bar: The BAR that is mapped into membase.
+ * @reg_base: Offset from the start of the bar to the function control window.
  * @monitor_work: Hardware monitor workitem
  * @biu_lock: BIU (bus interface unit) lock
  * @last_irq_cpu: Last CPU to handle a possible test interrupt.  This
@@ -1142,6 +1143,7 @@ struct efx_nic {
 	bool xdp_rxq_info_failed;
 
 	unsigned int mem_bar;
+	u32 reg_base;
 
 	/* The following fields may be written more often */