libcxgb: add library module for Chelsio drivers

Add common library module(libcxgb.ko) for
Chelsio drivers to remove duplicate code.

Code for iSCSI DDP Page Pod Manager is moved
from cxgb4.ko to libcxgb.ko. Earlier only cxgbit.ko
was using this code, now cxgb3i and cxgb4i will
also use common Page Pod manager code.

In future this module will have common connection
management and hardware specific code that can be
shared by multiple Chelsio drivers.

Signed-off-by: Varun Prakash <[email protected]>
Reviewed-by: Steve Wise <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

drivers/target/iscsi/cxgbit/Kconfig

@@ -1,7 +1,7 @@
 config ISCSI_TARGET_CXGB4
 	tristate "Chelsio iSCSI target offload driver"
 	depends on ISCSI_TARGET && CHELSIO_T4 && INET
-	select CHELSIO_T4_UWIRE
+	select CHELSIO_LIB
 	---help---
 	To compile this driver as module, choose M here: the module
 	will be called cxgbit.

drivers/target/iscsi/cxgbit/Makefile

@@ -1,4 +1,5 @@
 ccflags-y := -Idrivers/net/ethernet/chelsio/cxgb4
+ccflags-y += -Idrivers/net/ethernet/chelsio/libcxgb
 ccflags-y += -Idrivers/target/iscsi
 
 obj-$(CONFIG_ISCSI_TARGET_CXGB4)  += cxgbit.o

drivers/target/iscsi/cxgbit/cxgbit.h

@@ -37,7 +37,7 @@
 #include "cxgb4.h"
 #include "cxgb4_uld.h"
 #include "l2t.h"
-#include "cxgb4_ppm.h"
+#include "libcxgb_ppm.h"
 #include "cxgbit_lro.h"
 
 extern struct mutex cdev_list_lock;