sfc: move modparam 'interrupt_mode' out of common channel code

EF100 only supports MSI-X, so there's no need for the new driver to
 expose this old module parameter.
Since it's now visible to the linker, we have to rename it internally
 to efx_interrupt_mode to avoid symbol collisions in non-modular
 builds.

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

drivers/net/ethernet/sfc/efx.c

@@ -64,6 +64,10 @@ void efx_get_udp_tunnel_type_name(u16 type, char *buf, size_t buflen)
  *
  *************************************************************************/
 
+module_param_named(interrupt_mode, efx_interrupt_mode, uint, 0444);
+MODULE_PARM_DESC(interrupt_mode,
+		 "Interrupt mode (0=>MSIX 1=>MSI 2=>legacy)");
+
 /*
  * Use separate channels for TX and RX events
  *

drivers/net/ethernet/sfc/efx_channels.c

@@ -23,10 +23,7 @@
  * 1 => MSI
  * 2 => legacy
  */
-static unsigned int interrupt_mode;
-module_param(interrupt_mode, uint, 0444);
-MODULE_PARM_DESC(interrupt_mode,
-		 "Interrupt mode (0=>MSIX 1=>MSI 2=>legacy)");
+unsigned int efx_interrupt_mode = EFX_INT_MODE_MSIX;
 
 /* This is the requested number of CPUs to use for Receive-Side Scaling (RSS),
  * i.e. the number of CPUs among which we may distribute simultaneous
@@ -558,7 +555,7 @@ int efx_init_channels(struct efx_nic *efx)
 
 	/* Higher numbered interrupt modes are less capable! */
 	efx->interrupt_mode = min(efx->type->min_interrupt_mode,
-				  interrupt_mode);
+				  efx_interrupt_mode);
 
 	efx->max_channels = EFX_MAX_CHANNELS;
 	efx->max_tx_channels = EFX_MAX_CHANNELS;

drivers/net/ethernet/sfc/efx_channels.h

@@ -11,6 +11,8 @@
 #ifndef EFX_CHANNELS_H
 #define EFX_CHANNELS_H
 
+extern unsigned int efx_interrupt_mode;
+
 int efx_probe_interrupts(struct efx_nic *efx);
 void efx_remove_interrupts(struct efx_nic *efx);
 int efx_soft_enable_interrupts(struct efx_nic *efx);