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

Instead of exposing this old module parameter on the new driver (thus
 having to keep it forever after for compatibility), let's confine it
 to the old one; if we find later that we need the feature, we ought
 to support it properly, with ethtool set-channels.
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/efx.c

@@ -68,6 +68,9 @@ module_param_named(interrupt_mode, efx_interrupt_mode, uint, 0444);
 MODULE_PARM_DESC(interrupt_mode,
 		 "Interrupt mode (0=>MSIX 1=>MSI 2=>legacy)");
 
+module_param(rss_cpus, uint, 0444);
+MODULE_PARM_DESC(rss_cpus, "Number of CPUs to use for Receive-Side Scaling");
+
 /*
  * Use separate channels for TX and RX events
  *

drivers/net/ethernet/sfc/efx_channels.c

@@ -32,9 +32,7 @@ unsigned int efx_interrupt_mode = EFX_INT_MODE_MSIX;
  * Cards without MSI-X will only target one CPU via legacy or MSI interrupt.
  * The default (0) means to assign an interrupt to each core.
  */
-static unsigned int rss_cpus;
-module_param(rss_cpus, uint, 0444);
-MODULE_PARM_DESC(rss_cpus, "Number of CPUs to use for Receive-Side Scaling");
+unsigned int rss_cpus;
 
 static unsigned int irq_adapt_low_thresh = 8000;
 module_param(irq_adapt_low_thresh, uint, 0644);

drivers/net/ethernet/sfc/efx_channels.h

@@ -12,6 +12,7 @@
 #define EFX_CHANNELS_H
 
 extern unsigned int efx_interrupt_mode;
+extern unsigned int rss_cpus;
 
 int efx_probe_interrupts(struct efx_nic *efx);
 void efx_remove_interrupts(struct efx_nic *efx);