#
# Copyright 2021 Google LLC
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# version 2 as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#

EAPI="7"

inherit linux-mod

DESCRIPTION="DPDK kernel modules"
HOMEPAGE="http://git.dpdk.org/dpdk-kmods/"
MY_TAR=dpdk-kmods-abc7e0ec4a0bfb45330e670f8a277f4780e6c71f.tar.xz
SRC_URI="gs://chromeos-localmirror/distfiles/${MY_TAR} -> ${P}.tar.xz"

LICENSE="BSD-Google"
SLOT="vanilla"
KEYWORDS="*"
IUSE=""
RESTRICT="mirror"

DEPEND="virtual/linux-sources"
RDEPEND="${DEPEND}"

S="${WORKDIR}/dpdk-kmods-main/linux/igb_uio"

MODULE_NAMES="igb_uio(kernel/drivers/uio:${S}:${S})"

pkg_setup() {
	set -x
	ls "${ROOT}/usr/src"
	# We cannot rely on auto detection because we have two kernels installed.
	KERNEL_DIR="$(find "${ROOT}/usr/src" -maxdepth 1 -name "lakitu-kernel-[0-9]*")"
	KBUILD_OUTPUT="${KERNEL_DIR}/build"
	set +x
	linux-mod_pkg_setup
}

src_compile() {
	LIBELF="$("${CBUILD}-pkg-config" libelf --libs 2>/dev/null || echo -lelf)"
	BUILD_PARAMS="HOST_LIBELF_LIBS=${LIBELF} CC=${CC}"
	BUILD_PARAMS+=" -C ${KBUILD_OUTPUT} M=${S} LLVM_IAS=1"
	BUILD_TARGETS="modules"
	linux-mod_src_compile
}

src_install() {
	# Sign the module first.
	MODULE_OBJECT=igb_uio.ko
	cp ${MODULE_OBJECT} ${MODULE_OBJECT}.orig
	"${KBUILD_OUTPUT}"/scripts/sign-file \
		sha256 \
		"${KBUILD_OUTPUT}"/certs/signing_key.pem \
		"${KBUILD_OUTPUT}"/certs/signing_key.x509 \
		${MODULE_OBJECT} || die "signing failed"

	# Do not strip the module signature.
	dostrip -x /lib/modules/${KV_FULL}/kernel/drivers/uio/${MODULE_OBJECT}
	linux-mod_src_install
}