Add optional binary kernel modules package

Add optional binary kernel modules package, disabled by default
(build with DEB_BUILD_OPTIONS=kernel_modules to enable). If enabled
will build kernel modules against the local, current kernel version
(override by adding ksrc=<path/to/kernel/sources> to
DEB_BUILD_OPTIONS) into a dpdk-modules-<kernel version> package.

Useful for downstream projects that ship a complete ISO, where it is
not desirable to include a whole building environment for DKMS
packages.

Change-Id: I7e0ab239eaf08da71f9d58d60e32abf7cd42bec4
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>

1 files changed, 54 insertions, 4 deletions

diff --git a/debian/rules b/debian/rules
index 77f90d8f..da7e3c86 100755
--- a/debian/rules
+++ b/debian/rules
@@ -39,11 +39,55 @@ endif
 DPDK_STATIC_DIR = "debian/build/static-root"
 DPDK_SHARED_DIR = "debian/build/shared-root"
 
+# kernel_modules can be passed via DEB_BUILD_OPTIONS to enable building the
+# optional binary kernel modules package. By default it will be built against
+# the current kernel, or ksrc can be passed with a path to the target kernel
+# sources instead.
+ifeq (,$(findstring kernel_modules,$(DEB_BUILD_OPTIONS)))
+DPDK_CONFIG_BUILD_KMOD=n
+KSRC=""
+else
+ifneq (,$(filter ksrc=%,$(DEB_BUILD_OPTIONS)))
+    KSRC := $(patsubst ksrc=%,%,$(filter ksrc=%,$(DEB_BUILD_OPTIONS)))
+else
+    KSRC := /lib/modules/$(shell uname -r)/build
+endif
+
+KVERS := $(shell perl debian/kernel-version $(KSRC))
+export KVERS
+
+DPDK_CONFIG_BUILD_KMOD=y
+
+# Since the binary module package is generated at build time depending on the
+# local kernel version, we have to append the new package in d/control.
+# We cannot use a separate control file since that wouldn't work with
+# dpkg-genchanges, and also would require a lot of overrides for debhelpers.
+get_built_using	?= $(filter-out (=),$(shell dpkg-query -f='$${source:Package} (=$${source:Version})' -W $1))
+
+override_dh_gencontrol:
+	dh_gencontrol
+	dh_gencontrol -p dpdk-modules-$(KVERS) -- \
+		-v`cat debian/VERSION` \
+		-V'built:using:kernel=$(call get_built_using,linux-headers-$(KVERS))'
+
+build:
+	@if [ x"$(KVERS)" = x ] ; then \
+	    echo 'No version in $(KSRC)/include/linux/version.h' >&2; \
+	    exit 1; \
+	fi
+	sh debian/prep-modules $(KSRC)
+	test -f debian/control.orig || cp -v debian/control debian/control.orig
+	cat debian/control.orig debian/control.modules > debian/control
+	dh $@ --with python2,dkms
+endif
+
 %:
 	dh $@ --with python2,dkms
 
 override_dh_auto_clean:
-	rm -rf debian/build debian/tmp
+	rm -rf debian/build debian/tmp debian/dpdk-modules-* \
+		debian/control.modules debian/VERSION
+	mv debian/control.orig debian/control || true
 
 override_dh_auto_configure:
 	# report dpkg-buildflags status to build log
@@ -53,8 +97,8 @@ override_dh_auto_configure:
 	$(MAKE) V=$(DH_VERBOSE) O=$(DPDK_STATIC_DIR) T=$(DPDK_CONFIG) config
 	sed -ri -e 's,(RTE_MACHINE=).*,\1$(RTE_MACHINE),' \
 		-e 's,(RTE_NEXT_ABI=).*,\1n,' \
-		-e 's,(CONFIG_RTE_EAL_IGB_UIO=).*,\1n,' \
-		-e 's,(CONFIG_RTE_KNI_KMOD=).*,\1n,' \
+		-e 's,(CONFIG_RTE_EAL_IGB_UIO=).*,\1$(DPDK_CONFIG_BUILD_KMOD),' \
+		-e 's,(CONFIG_RTE_KNI_KMOD=).*,\1$(DPDK_CONFIG_BUILD_KMOD),' \
 		-e 's,(LIBRTE_PMD_PCAP=).*,\1y,' \
 		-e 's,(LIBRTE_PMD_XENVIRT=).*,\1y,' \
 		$(DPDK_STATIC_DIR)/.config
@@ -83,7 +127,7 @@ override_dh_auto_build-arch:
 	cp -a $(DPDK_STATIC_DIR) $(DPDK_SHARED_DIR)
 	sed -ri 's,(RTE_BUILD_SHARED_LIB=).*,\1y,' \
 		$(DPDK_SHARED_DIR)/.config
-	$(MAKE) V=$(DH_VERBOSE) O=$(DPDK_SHARED_DIR) build
+	$(MAKE) V=$(DH_VERBOSE) O=$(DPDK_SHARED_DIR) RTE_KERNELDIR=$(KSRC) build
 
 override_dh_auto_install-arch: LIBDIR=usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
 override_dh_auto_install-arch:
@@ -146,6 +190,12 @@ override_dh_auto_install-arch:
 	mkdir -p debian/dpdk-rte-kni-dkms/usr/src/dpdk-rte-kni-$(VERSION)
 	cp -a lib/librte_eal/linuxapp/kni/* \
 		debian/dpdk-rte-kni-dkms/usr/src/dpdk-rte-kni-$(VERSION)
+ifneq (,$(KVERS))
+	# Package: dpdk-modules-<kernel version>
+	mkdir -p debian/dpdk-modules-$(KVERS)/lib/modules/$(KVERS)/kernel/drivers/net
+	cp -a debian/build/shared-root/kmod/* \
+		debian/dpdk-modules-$(KVERS)/lib/modules/$(KVERS)/kernel/drivers/net
+endif
 
 override_dh_dkms:
 	dh_dkms -V $(VERSION)