bnx2x: Segregate SR-IOV code

In this patch the SR-IOV code is segregated from the main bulk of
the bnx2x code. The CONFIG_BNX2X_SRIOV define is added to Broadcom's
Kconfig, and allows the elision of the building of all the SR-IOV
support code in the driver.
The define is dependant on the kernel CONFIG_PCI_IOV configuration
define.

Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/broadcom/Kconfig b/drivers/net/ethernet/broadcom/Kconfig
index f552673..3b3bf0d 100644
--- a/drivers/net/ethernet/broadcom/Kconfig
+++ b/drivers/net/ethernet/broadcom/Kconfig
@@ -121,4 +121,13 @@
 	  To compile this driver as a module, choose M here: the module
 	  will be called bnx2x.  This is recommended.
 
+config BNX2X_SRIOV
+	bool "Broadcom 578xx and 57712 SR-IOV support"
+	depends on BNX2X && PCI_IOV
+	default y
+	---help---
+	  This configuration parameter enables Single Root Input Output
+	  Virtualization support in the 578xx and 57712 products. This
+	  allows for virtual function acceleration in virtual environments.
+
 endif # NET_VENDOR_BROADCOM