DEBUG := debug
EXTRA_CFLAGS+= -g

sles_distro := $(wildcard /etc/SuSE-release)
rhel_distro := $(wildcard /etc/redhat-release)

KVER := $(shell uname -r)
INC_DIR := /lib/modules/$(KVER)/build/include

# Check for a standard header, say scsi.h, in the usual location.
# Lack of which usually means a SLES machine, which does not have
# headers like other distros; this way an upstream compile would
# work on a SLES machine.
ifeq ($(wildcard $(INC_DIR)/scsi/scsi.h),) # very likely SLES
	_KVER=$(shell echo $(KVER) | cut -d "-" -f1,2)
	INC_DIR := /usr/src/linux-$(_KVER)/include
endif

#
# set-def:-
# $(call set-def,<define>,<include-file>,<regex-pattern>)
# 	- returns <define> if pattern is in include file.
#
# pattern should have word boundaries (-w option) and should not have
# embedded space (use \s instead).
#
define set-def
$(shell grep -qsw "$(strip $3)" \
        $(INC_DIR)/$(strip $2) && echo "$(strip $1)")
endef

DEFINES += $(call set-def,DEFINE_FIP_VLAN_DESC,scsi/fc/fc_fip.h,fip_vlan_desc)
DEFINES += $(call set-def,DEFINE_FIP_SC_VL_REP,scsi/fc/fc_fip.h,FIP_SC_VL_REP)
DEFINES += $(call set-def,ETHER_ADDR_COPY,linux/etherdevice.h,ether_addr_copy)
DEFINES += $(call set-def,ETHER_ADDR_EQUAL,linux/etherdevice.h,ether_addr_equal)
DEFINES += $(call set-def,ETH_ZERO_ADDR,linux/etherdevice.h,eth_zero_addr)
DEFINES += $(call set-def,KMALLOC_ARRAY,linux/slab.h,kmalloc_array)
DEFINES += $(call set-def,FC_DISC_CONFIG,scsi/libfc.h,fc_disc_config)
DEFINES += $(call set-def,KREF_READ,linux/kref.h,kref_read)
DEFINES += $(call set-def,FC_RPORT_LOGIN,scsi/libfc.h,fc_rport_login)
DEFINES += $(call set-def,FC_RPORT_LOGOFF,scsi/libfc.h,fc_rport_logoff)
DEFINES += $(call set-def,FC_RPORT_CREATE,scsi/libfc.h,fc_rport_create)
DEFINES += $(call set-def,FC_RPORT_DESTROY,scsi/libfc.h,fc_rport_destroy)
DEFINES += $(call set-def,FC_RPORT_LOOKUP,scsi/libfc.h,fc_rport_lookup)
DEFINES += $(call set-def,FC_RPORT_INIT,scsi/libfc.h,fc_rport_init)
DEFINES += $(call set-def,KREF_GET_UNLESS_ZERO,linux/kref.h,kref_get_unless_zero)
DEFINES += $(call set-def,USE_BLK_MQ,scsi/scsi_host.h,nr_hw_queues)

override EXTRA_CFLAGS += $(addprefix -D,$(DEFINES))

# Addition defines via command line, call: make EXTRA_DEFINES=XYZ
override EXTRA_CFLAGS += $(addprefix -D,$(EXTRA_DEFINES))

ifneq ($(debug),)
$(warning EXTRA_CFLAGS=($(EXTRA_CFLAGS)))
endif

obj-m := qedf.o
qedf-objs = qedf_dbg.o qedf_main.o qedf_io.o qedf_fip.o \
	    qedf_attr.o qedf_els.o qedf_debugfs.o \
	    drv_scsi_fw_funcs.o drv_fcoe_fw_funcs.o

KVER_DIR=/lib/modules/$(KVER)
current_modules := $(shell grep -s ^INITRD_MODULES /etc/sysconfig/kernel | awk -F'"' '$$0=$$2')

PREFIX=
ifneq ($(rhel_distro),)
DISTRO_DRV_DIR := extra
else
DISTRO_DRV_DIR := updates
endif
DRV_DIR := $(DISTRO_DRV_DIR)/qlgc-fastlinq

ifeq ($(ERROR_INJECT), 1)
override EXTRA_CFLAGS += -DERROR_INJECT
endif

NPROCS:=$(shell grep -c ^processor /proc/cpuinfo)

.PHONY: build_pre sparse sparse_endian smatch modcopy modules_install install

QED_FILES := Module.symvers qed_if.h qed_fcoe_if.h qed_ll2_if.h qed_chain.h

build: build_pre
	make -C $(KVER_DIR)/build -j$(NPROCS) M=`pwd` modules

$(QED_FILES): $(addprefix ../qed-8.33.9.0/src/,$(QED_FILES))
	cp -f $^ .

build_pre: $(QED_FILES)

sparse: build_pre
	if which sparse 1>/dev/null 2>&1; then\
		make -C $(KVER_DIR)/build C=2 M=`pwd` modules;\
	fi

sparse_endian: build_pre
	if which sparse 1>/dev/null 2>&1; then\
		make -C $(KVER_DIR)/build C=2 CF="-D_CHECK_ENDIAN_" M=`pwd` modules;\
	fi

smatch: build_pre
	if which smatch 1>/dev/null 2>&1; then\
		make -C $(KVER_DIR)/build CHECK="/root/bin/smatch -p=kernel" C=2 M=`pwd` modules;\
	fi
	
clean:
	rm -f Module.symvers
	rm -f modules.order
	rm -f ../storcmn/\.*.cmd ../storcmn/*.o
	make -C $(KVER_DIR)/build M=`pwd` clean

modcopy: build
	make -C $(KVER_DIR)/build M=`pwd` INSTALL_MOD_PATH=$(PREFIX) INSTALL_MOD_DIR=$(DRV_DIR) modules_install
	@if [ "$(rhel_distro)" != "" ]; then \
		echo "override qedf * $(DRV_DIR)" > qedf.conf ;\
		install -m 644 -D qedf.conf $(PREFIX)/etc/depmod.d/qedf.conf ;\
	fi
	@if [ "$(PREFIX)" = "" ] ;\
		then /sbin/depmod -a ;\
		else echo " *** Run '/sbin/depmod -a' to update the module database." ;\
	fi

modules_install: modcopy
	@if [ -f /boot/initramfs-$(KVER).img ]; then\
		echo "back up initrd to /boot/initramfs-$(KVER).img.bak" ;\
		cp /boot/initramfs-$(KVER).img /boot/initramfs-$(KVER).img.bak ;\
	elif [ -f /boot/initrd-$(KVER) ]; then\
		echo "back up initrd to /boot/initrd-$(KVER).bak";\
		cp /boot/initrd-$(KVER) /boot/initrd-$(KVER).bak;\
	elif [ -f /boot/initrd.img-$(KVER) ]; then\
		echo "back up initrd to /boot/initrd.img-$(KVER).bak";\
		cp /boot/initrd.img-$(KVER) /boot/initrd.img-$(KVER).bak;\
	fi
	@echo "add driver qedf to initrd"
	@if which dracut 1>/dev/null 2>&1; then\
		dracut -f --add-drivers qedf;\
	elif [ -f /boot/initrd.img-$(KVER) ] && [ -f /usr/sbin/update-initramfs ]; then\
		echo "updating initrd" ;\
		update-initramfs -u;\
	else\
	        if [ `echo $(current_modules) | grep -c qedf` -eq 0 ];\
		then\
			echo "need to add qedf to /sys/config/kernel";\
			sed -i "s/^INITRD_MODULES=\"${current_modules}\"/INITRD_MODULES=\"${current_modules} qedf\"/" /etc/sysconfig/kernel;\
	        fi;\
		mkinitrd -m qedf;\
	fi

install: modules_install