#
# Makefile for ib_srpt.ko.
#
ifndef PREFIX
	PREFIX=/usr/local
endif

SCST_INC_DIR := $(shell if [ -e "$$PWD/../scst" ];			\
			then echo "$$PWD/../scst/include";		\
			else echo "$(DESTDIR)$(PREFIX)/include/scst"; fi)
SCST_SYMVERS_DIR := $(shell if [ -e $$PWD/../scst ]; then	\
                        echo $$PWD/../scst/src;			\
                      else echo $(DESTDIR)$(PREFIX)/include/scst; fi)
SUBDIRS := $(shell pwd)

ifeq ($(KVER),)
  ifeq ($(KDIR),)
    KVER := $(shell uname -r)
    KDIR := /lib/modules/$(KVER)/build
  else
    ifeq ($(KERNELRELEASE),)
      KVER := $(strip $(shell						\
	cat $(KDIR)/include/config/kernel.release 2>/dev/null ||	\
	make -s -C $(KDIR) kernelversion))
    else
      KVER := $(KERNELRELEASE)
    endif
  endif
else
  KDIR := /lib/modules/$(KVER)/build
endif

ifeq ($(INSTALL_MOD_PATH),)
  export INSTALL_MOD_PATH := $(DESTDIR)
endif

INSTALL_DIR := $(INSTALL_MOD_PATH)/lib/modules/$(KVER)/extra

# Set variable $(2) to value $(3) in file $(1).
set_var = $(shell { if [ -e "$(1)" ]; then grep -v '^$(2)=' "$(1)"; fi; echo "$(2)=$(3)"; } >/tmp/$(1)-$$$$.tmp && mv /tmp/$(1)-$$$$.tmp $(1))


SRC_FILES=$(wildcard */*.[ch])

# The file Modules.symvers has been renamed in the 2.6.18 kernel to
# Module.symvers. Find out which name to use by looking in $(KDIR).
MODULE_SYMVERS:=$(shell if [ -e $(KDIR)/Module.symvers ]; then \
		       echo Module.symvers; else echo Modules.symvers; fi)

# Name of the OFED kernel RPM.
OFED_KERNEL_IB_RPM:=$(shell for r in kernel-ib mlnx-ofa_kernel compat-rdma; do rpm -q $$r 2>/dev/null | grep -q "^$$r" && echo $$r && break; done)

# Name of the OFED kernel development RPM.
OFED_KERNEL_IB_DEVEL_RPM:=$(shell for r in kernel-ib-devel mlnx-ofa_kernel-devel compat-rdma-devel; do rpm -q $$r 2>/dev/null | grep -q "^$$r" && echo $$r && break; done)

ifeq ($(OFED_KERNEL_IB_RPM),kernel-ib)
# Read OFED 1.x's config.mk, which contains the definition of the variable
# BACKPORT_INCLUDES.
include /usr/src/ofa_kernel/config.mk
OFED_MODULE_SYMVERS:=/usr/src/ofa_kernel/Module.symvers
OFED_CFLAGS:=$(BACKPORT_INCLUDES) -I/usr/src/ofa_kernel/include
endif
ifeq ($(OFED_KERNEL_IB_RPM),mlnx-ofa_kernel)
OFED_MODULE_SYMVERS:=/usr/src/ofa_kernel/default/Module.symvers
OFED_CFLAGS:=-I/usr/src/ofa_kernel/default/include
endif
ifeq ($(OFED_KERNEL_IB_RPM),compat-rdma)
OFED_MODULE_SYMVERS:=/usr/src/compat-rdma/Module.symvers
OFED_CFLAGS:=-I/usr/src/compat-rdma/include
endif

# Path of the OFED ib_srpt.ko kernel module.
OFED_SRPT_PATH:=/lib/modules/$(KVER)/updates/kernel/drivers/infiniband/ulp/srpt/ib_srpt.ko

# Whether or not the OFED ib_srpt.ko kernel module has been installed.
OFED_SRPT_INSTALLED:=$(shell if [ -e $(OFED_SRPT_PATH) ]; then echo true; else echo false; fi)


all: src/$(MODULE_SYMVERS)
	$(MAKE) -C $(KDIR) SUBDIRS=$(shell pwd)/src \
	  PRE_CFLAGS="$(OFED_CFLAGS)" SCST_INC_DIR=$(SCST_INC_DIR) modules

install: all src/ib_srpt.ko
	$(MAKE) -C $(KDIR) SUBDIRS=$(shell pwd)/src		   \
	  PRE_CFLAGS="$(OFED_CFLAGS)" SCST_INC_DIR=$(SCST_INC_DIR) \
	  modules_install

uninstall:
	rm -f $(INSTALL_DIR)/ib_srpt.ko
	-/sbin/depmod -b $(INSTALL_MOD_PATH)/ -a $(KVER)

src/Module.symvers src/Modules.symvers: $(SCST_SYMVERS_DIR)/$(MODULE_SYMVERS)
	@if [ -n "$(OFED_KERNEL_IB_RPM)" ]; then                            \
	  if [ -z "$(OFED_KERNEL_IB_DEVEL_RPM)" ]; then                     \
	    echo "Error: the OFED package $(OFED_KERNEL_IB_RPM)-devel has"  \
	         " not yet been installed.";                                \
	    false;                                                          \
	  elif [ -e /lib/modules/$(KVER)/kernel/drivers/infiniband ]; then  \
	    echo "Error: the distro-provided InfiniBand kernel drivers"     \
	         "must be removed first"                                    \
	         " (/lib/modules/$(KVER)/kernel/drivers/infiniband).";      \
	    false;                                                          \
	  elif $(OFED_SRPT_INSTALLED); then                                 \
	    echo "Error: OFED has been built with srpt=y in ofed.conf.";    \
	    echo "Rebuild OFED with srpt=n.";                               \
	    false;                                                          \
	  elif [ -e $(KDIR)/scripts/Makefile.lib ]                          \
	       && ! grep -wq '^c_flags .*PRE_CFLAGS'                        \
	          $(KDIR)/scripts/Makefile.lib                              \
	       && ! grep -wq '^LINUXINCLUDE .*PRE_CFLAGS'                   \
	          $(KDIR)/Makefile; then                                    \
	    echo "Error: the kernel build system has not yet been patched.";\
	    false;                                                          \
	  else                                                              \
	    echo "  Building against $(OFED_KERNEL_IB_RPM) InfiniBand"      \
	         "kernel headers.";                                         \
	    (                                                               \
	      grep -v drivers/infiniband/ $<;                               \
	      cat $(OFED_MODULE_SYMVERS)                                    \
	    ) >$@;                                                          \
	  fi                                                                \
	else                                                                \
	  if [ -n "$(OFED_KERNEL_IB_DEVEL_RPM)" ]; then                     \
	    echo "Error: the OFED kernel package has not yet been"          \
	         "installed.";                                              \
	    false;                                                          \
	  else                                                              \
	    echo "  Building against in-tree InfiniBand kernel headers.";   \
	    cp $< $@;                                                       \
	  fi;                                                               \
	fi

clean:
	$(MAKE) -C $(KDIR) SUBDIRS=$(shell pwd)/src clean
	rm -f src/Modules.symvers src/Module.symvers src/Module.markers \
		src/modules.order

extraclean: clean
	rm -f *.orig *.rej

2debug:
	-$(MAKE) clean
	$(call set_var,build_mode,BUILDMODE,)

2release:
	-$(MAKE) clean
	$(call set_var,build_mode,BUILDMODE,RELEASE)

2perf:
	-$(MAKE) clean
	$(call set_var,build_mode,BUILDMODE,PERF)

release-archive:
	../scripts/generate-release-archive srpt "$$(sed -n 's/^#define[[:blank:]]DRV_VERSION[[:blank:]]*\"\([^\"]*\)\".*/\1/p' src/ib_srpt.c)"

kerneldoc.html: $(SRC_FILES)
	$(KDIR)/scripts/kernel-doc -html $(SRC_FILES) >$@

.PHONY: all install clean extraclean 2debug 2release 2perf