KVER ?= $(shell uname -r)
SRC_DIR ?= $(shell pwd)
MLNX_ARCH = $(shell uname -m)
OFA_DIR ?= /usr/src/ofa_kernel/$(MLNX_ARCH)
OFA = $(shell ( test -d $(OFA_DIR)/$(KVER) && echo $(OFA_DIR)/$(KVER) ) || ( test -d /var/lib/dkms/mlnx-ofed-kernel/ && ls -d /var/lib/dkms/mlnx-ofed-kernel/*/build ) || ( echo $(OFA_DIR) ))

ifneq ($(shell test -d $(OFA) && echo "true" || echo "" ),)
include $(OFA)/configure.mk.kernel
endif

export KERNELRELEASE=$(KVER)
K_BUILD ?= /lib/modules/$(KVER)/build
K_OBJ ?= $(K_BUILD)
K_SRC ?= $(shell test -d /lib/modules/$(KVER)/source && echo /lib/modules/$(KVER)/source || echo $(K_BUILD))

EXTRA_CFLAGS += $(shell echo $(BACKPORT_INCLUDES) | sed -e 's@/var/tmp/OFED_topdir/BUILD@/usr/src@')

autoconf_h=$(shell /bin/ls -1 $(K_BUILD)/include/*/autoconf.h 2> /dev/null | head -1)
kconfig_h=$(shell /bin/ls -1 $(K_BUILD)/include/*/kconfig.h 2> /dev/null | head -1)

ifneq ($(kconfig_h),)
KCONFIG_H = -include $(kconfig_h)
endif

V ?= 0

# GCC earlier than 4.6.0 will build modules which require 'mcount',
# and this symbol will not be available in the kernel if the kernel was
# compiled with GCC 4.6.0 and above.
# therefore, to prevent unknown symbol issues we disable function tracing.
#
CC  = $(CROSS_COMPILE)gcc
CPP = $(CC) -E

CPP_MAJOR := $(shell $(CPP) -dumpversion 2>&1 | cut -d'.' -f1)
CPP_MINOR := $(shell $(CPP) -dumpversion 2>&1 | cut -d'.' -f2)
CPP_PATCH := $(shell $(CPP) -dumpversion 2>&1 | cut -d'.' -f3)
# Assumes that major, minor, and patch cannot exceed 999
CPP_VERS  := $(shell expr 0$(CPP_MAJOR) \* 1000000 + 0$(CPP_MINOR) \* 1000 + 0$(CPP_PATCH))
compile_h=$(shell /bin/ls -1 $(K_BUILD)/include/*/compile.h 2> /dev/null | head -1)
ifneq ($(compile_h),)
KERNEL_GCC_MAJOR := $(shell grep LINUX_COMPILER $(compile_h) | sed -r -e 's/.*gcc version ([0-9\.\-]*) .*/\1/g' | cut -d'.' -f1)
KERNEL_GCC_MINOR := $(shell grep LINUX_COMPILER $(compile_h) | sed -r -e 's/.*gcc version ([0-9\.\-]*) .*/\1/g' | cut -d'.' -f2)
KERNEL_GCC_PATCH := $(shell grep LINUX_COMPILER $(compile_h) | sed -r -e 's/.*gcc version ([0-9\.\-]*) .*/\1/g' | cut -d'.' -f3)
KERNEL_GCC_VER  := $(shell expr 0$(KERNEL_GCC_MAJOR) \* 1000000 + 0$(KERNEL_GCC_MINOR) \* 1000 + 0$(KERNEL_GCC_PATCH))
ifneq ($(shell if [ $(CPP_VERS) -lt 4006000 ] && [ $(KERNEL_GCC_VER) -ge 4006000 ]; then \
					echo "YES"; else echo ""; fi),)
$(info Warning: The kernel was compiled with GCC newer than 4.6.0, while the current GCC is older than 4.6.0, Disabling function tracing to prevent unknown symbol issues...)
override WITH_MAKE_PARAMS += CONFIG_FUNCTION_TRACER= CONFIG_HAVE_FENTRY=
endif
ifneq ($(shell if [ $(CPP_VERS) -ge 4006000 ] && [ $(KERNEL_GCC_VER) -lt 4006000 ]; then \
					echo "YES"; else echo ""; fi),)
$(info Warning: The kernel was compiled with GCC older than 4.6.0, while the current GCC is newer than 4.6.0, Disabling function tracing to prevent unknown symbol issues...)
override WITH_MAKE_PARAMS += CONFIG_FUNCTION_TRACER= CONFIG_HAVE_FENTRY=
endif
endif

ifneq ($(shell if (echo $(KVER) | grep -qE 'uek'); then \
					echo "YES"; else echo ""; fi),)
override WITH_MAKE_PARAMS += ctf-dir=$(CWD)/.ctf
endif

# This is an UGLY compat for MOFED ib_query_gid with attrs
ifneq ($(shell test -d $(OFA) && echo "true" || echo "" ),)
EXTRA_CFLAGS += -DHAVE_IB_QUERY_GID_ATTRS
endif

name := srp
VERSION=$(shell grep "define _version" $(name).spec  | sed -e 's/.*_version //' | sed -e 's/}//' | sed -e 's/\s*//g')
RELEASE=$(shell grep "define _release" $(name).spec  | sed -e 's/.*_release //' | sed -e 's/}//' | sed -e 's/\s*//g')
PACKAGE := $(name)-$(VERSION)
SHELL = /bin/bash
rpmspec := $(name).spec
rpmroot = $(PWD)/rpm-dist/
rpmopts = --nodeps --buildroot='$(rpmroot)/_rpm' --define '_source_filedigest_algorithm md5' --define '_binary_filedigest_algorithm md5'
rpmmacros =\
		   --define='_topdir $(rpmroot)'\
		   --define='_rpmdir $(rpmroot)'\
		   --define='_srcrpmdir $(rpmroot)'\
		   --define='_sourcedir $(rpmroot)'\
		   --define='_specdir $(PWD)'
override WITH_MAKE_PARAMS += KBUILD_EXTRA_SYMBOLS=$(OFA)/Module.symvers

LINUXINCLUDE=\
		$(EXTRA_CFLAGS) \
		-include $(autoconf_h) \
		$(KCONFIG_H) \
		-include $(OFA)/include/linux/compat-2.6.h \
		-I$(PWD) \
		-I$(OFA)/include \
		-I$(OFA)/include/uapi \
		$(BACKPORT_INCLUDES) \
		$$(if $$(CONFIG_XEN),-D__XEN_INTERFACE_VERSION__=$$(CONFIG_XEN_INTERFACE_VERSION)) \
		$$(if $$(CONFIG_XEN),-I$$(srctree)/arch/x86/include/mach-xen) \
		-I$$(srctree)/arch/$$(SRCARCH)/include \
		-Iarch/$$(SRCARCH)/include/generated \
		-Iinclude \
		-I$$(srctree)/arch/$$(SRCARCH)/include/uapi \
		-Iarch/$$(SRCARCH)/include/generated/uapi \
		-I$$(srctree)/include \
		-I$$(srctree)/include/uapi \
		-Iinclude/generated/uapi \
		$$(if $$(KBUILD_SRC),-Iinclude2 -I$$(srctree)/include) \
		-I$$(srctree)/arch/$$(SRCARCH)/include \
		-Iarch/$$(SRCARCH)/include/generated \
		#

default: prep
ifneq ($(shell test -d $(OFA) && echo "true" || echo "" ),)
# compile with ofed driver
	make -C $(K_BUILD) O=$(K_OBJ) M=$(shell pwd) $(WITH_MAKE_PARAMS) \
		CONFIG_SCSI_SRP_ATTRS_STANDALONE=m \
		CONFIG_SCSI_SRP_ATTRS=m \
		CONFIG_INFINIBAND_SRP=m \
		CONFIG_INFINIBAND_SRP_DUMMY= \
		CONFIG_DTRACE= \
		CONFIG_CTF= \
		LINUXINCLUDE='$(LINUXINCLUDE)' \
		modules
else
# compile with inbox driver
		make EXTRA_CFLAGS="$(EXTRA_CFLAGS)" -C $(K_BUILD) O=$(K_OBJ) M=$(shell pwd) \
		CONFIG_SCSI_SRP_ATTRS_STANDALONE=m \
		CONFIG_SCSI_SRP_ATTRS=m \
		CONFIG_INFINIBAND_SRP=m \
		CONFIG_INFINIBAND_SRP_DUMMY= \
		modules
endif

install:
	make -C $(K_BUILD) O=$(K_OBJ) M=$(shell pwd) INSTALL_MOD_PATH=$(INSTALL_MOD_PATH) INSTALL_MOD_DIR=$(INSTALL_MOD_DIR) $(WITH_MAKE_PARAMS) modules_install
	if [ ! -n "$(INSTALL_MOD_PATH)" ]; then /sbin/depmod $(KVER);fi;

rpmcheck:
	@which rpmbuild &> /dev/null; \
		if [ $$? -ne 0 ]; then \
		echo "*** This make target requires an rpm-based linux distribution."; \
		(exit 1); exit 1; \
		fi
	-mkdir -p $(rpmroot)/BUILD

srcrpm: dist rpmcheck $(rpmspec)
	-rpmbuild -bs --define 'src_release $(RELEASE)' $(rpmmacros) $(rpmopts) $(rpmspec); \
		if [ $$? -ne 0 ]; then \
		(exit 1); exit 1; \
		fi

binrpm: rpmcheck $(rpmspec)
	-rpmbuild -bb $(rpmmacros) $(rpmopts) $(rpmspec); \
		if [ $$? -ne 0 ]; then \
		(exit 1); exit 1; \
		fi

dist: prep
	mkdir -p $(rpmroot)/$(PACKAGE)/
	cp {$(rpmspec),Kconfig,makefile,Kbuild,dkms.conf,Module.supported} $(rpmroot)/$(PACKAGE)/
	cp common.postinst $(rpmroot)/$(PACKAGE)/
	cp *.c $(rpmroot)/$(PACKAGE)/
	cp *.h $(rpmroot)/$(PACKAGE)/
	cp -r debian $(rpmroot)/$(PACKAGE)/
	cp -r tools $(rpmroot)/$(PACKAGE)/
	cp -r $(PWD)/scsi $(rpmroot)/$(PACKAGE)/
	cd $(rpmroot) && tar czf $(PACKAGE).tgz $(PACKAGE)
	cd $(rpmroot) && tar czf $(name)_$(VERSION).orig.tar.gz $(PACKAGE)

prep:
ifeq ($(shell test -d $(PWD)/scsi && echo "true" || echo ""),)
	-cp -r $(PWD)/../../../scsi $(PWD)
	-cp -r $(PWD)/../../../../include/scsi/* $(PWD)/scsi
	-rm -rf $(PWD)/scsi/scsi.h
	-rm -rf $(PWD)/scsi/scsi_device.h
	-rm -rf $(PWD)/scsi/cxgbi
	-sed -i 's@<scsi/scsi_transport_srp.h>@"scsi/scsi_transport_srp.h"@g' $(PWD)/ib_srp.c
endif

clean:
	rm -f *.o
	rm -f *.ko *.ko.gz
	rm -f *.mod.c
	rm -f Module*.symvers modules*.order

distclean: clean
	@rm -rf $(PWD)/rpm-dist
	rm -f makefile Makefile *.spec
	rm -rf $(PWD)/scsi

all: clean distclean dist srcrpm binrpm
