/lib/dpdk/dpdk-init is in dpdk 17.11.1-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# dpdk-init: startup script to initialize a dpdk runtime environment
#
# Copyright 2015-2016 Canonical Ltd.
# Autor: Stefan Bader <stefan.bader@canonical.com>
# Autor: Christian Ehrhardt <christian.ehrhardt@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
set -e
DPDK_BIND="/sbin/dpdk-devbind"
DPDK_INTERF="/etc/dpdk/interfaces"
# pagesize supports [G|g]/[M|m]/[K|k]
get_kbytes() {
local unit
local num
unit=$(echo "${1}" | sed 's/[0-9]*//g')
num=$(echo "${1}" | sed 's/[^0-9]*//g')
case ${unit} in
*g | *G)
echo $((num*1024*1024))
;;
*m | *M)
echo $((num*1024))
;;
*k | *K)
echo $((num))
;;
*)
echo $((num/1024))
;;
esac
}
get_default_hpgsz() {
default_hpgsz=$(grep "Hugepagesize:" /proc/meminfo \
| sed 's/^Hugepagesize:\s*//g' | sed 's/\s*kB$//g')
echo "${default_hpgsz}"
}
get_hugetlbfs_mountpoint() {
local requested_hpgsz
local mp_hpgsz
requested_hpgsz=$(get_kbytes "${1}")
grep hugetlbfs /proc/mounts | while read \
mntfrom mntpoint mntfstype mntopt mntdump mntfsck; do
# check if the current muntpoint is of the requested huge page size
case ${mntopt} in
*pagesize=*)
mp_hpgsz=$(echo "${mntopt}" | sed 's/.*pagesize=//g' | sed 's/,.*//g')
mp_hpgsz=$(get_kbytes "${mp_hpgsz}")
;;
*)
mp_hpgsz=$(get_default_hpgsz)
;;
esac
if [ "${requested_hpgsz}" -eq "${mp_hpgsz}" ]; then
echo "${mntpoint}"
return
fi
done
}
_mount_hugetlbfs() {
local MNT="/dev/hugepages"
local MNTOPTS=""
local requested_hpgsz
local default_hpgsz
requested_hpgsz=$(get_kbytes "${1}")
default_hpgsz=$(get_default_hpgsz)
# kernel might not support the requested size
if [ ! -d "/sys/kernel/mm/hugepages/hugepages-${requested_hpgsz}kB" ]; then
echo "WARNING: requested page size of ${requested_hpgsz}kB " \
"not supported by the kernel"
return 0
fi
# special case if this is not the default huge page size
if [ "${requested_hpgsz}" -ne "${default_hpgsz}" ]; then
MNT="${MNT}-${requested_hpgsz}"
MNTOPTS="pagesize=${requested_hpgsz}K"
fi
if [ ! -e "${MNT}" ]; then
mkdir "${MNT}"
if [ $? -ne 0 ]; then
echo "Could not create directory ${MNT}!" >&2
return 1
fi
fi
mount -thugetlbfs hugetlbfs "${MNT}" -o "${MNTOPTS}"
return $?
}
#
# The DPDK library will use the first mounted instance it finds for a given
# page size. so if there is already one for a given size there is no need to
# create another for the same huge page size.
#
mount_hugetlbfs() {
if [ ! -r /etc/dpdk/dpdk.conf ]; then
return 1
fi
. /etc/dpdk/dpdk.conf
# if a page size is requested, there has to be a mountpoint for that size
if [ -n "${NR_2M_PAGES}" -a -z "$(get_hugetlbfs_mountpoint '2M')" ]; then
_mount_hugetlbfs 2M
fi
if [ -n "${NR_16M_PAGES}" -a -z "$(get_hugetlbfs_mountpoint '16M')" ]; then
_mount_hugetlbfs 16M
fi
if [ -n "${NR_1G_PAGES}" -a -z "$(get_hugetlbfs_mountpoint '1G')" ]; then
_mount_hugetlbfs 1G
fi
}
_setup_hugepages() {
MMDIR="/sys/kernel/mm/hugepages/${1}"
PAGES=${2}
if [ "$PAGES" != "" ]; then
if [ "$PAGES" -gt 0 ]; then
if [ -d "$MMDIR" -a -w "$MMDIR/nr_hugepages" ]; then
# increases the chance to allocate enough huge pages
# configurable, since it comes at a perf penality
if [ "$DROPCACHE_BEFORE_HP_ALLOC" = "1" ]; then
echo 3 > /proc/sys/vm/drop_caches
fi
echo "$PAGES" > "$MMDIR/nr_hugepages"
GOTPAGES=$(cat "$MMDIR/nr_hugepages")
if [ "$GOTPAGES" -lt "$PAGES" ]; then
echo "WARNING: could not allocate $PAGES at " \
"$MMDIR/nr_hugepages (only got $GOTPAGES)."
fi
else
echo "WARNING: $MMDIR/nr_hugepages not found/writable"
fi
fi
fi
}
#
# Reserve a certain amount of hugepages (defined in /etc/dpdk.conf)
#
setup_hugepages() {
if [ ! -r /etc/dpdk/dpdk.conf ]; then
return 1
fi
. /etc/dpdk/dpdk.conf
_setup_hugepages "hugepages-2048kB" "$NR_2M_PAGES"
_setup_hugepages "hugepages-16384kB" "$NR_16M_PAGES"
_setup_hugepages "hugepages-1048576kB" "$NR_1G_PAGES"
# dpdk uses 2*#hugepages mappings, increase for huge systems LP #1507921
if [ -d /sys/kernel/mm/hugepages ]; then
max_map_count=$(awk -v pad=65530 '{tot+=$1}END{print tot*2+pad}' \
/sys/kernel/mm/hugepages/hugepages-*/nr_hugepages)
sysctl -q vm.max_map_count="${max_map_count:-65530}"
fi
return 0
}
#
# Allow NICs to be automatically bound to DPDK compatible drivers on boot.
#
bind_interfaces() {
if [ ! -r "$DPDK_INTERF" ]; then
return 0
fi
grep -v '^[ \t]*#' "$DPDK_INTERF" | while read BUS ID MOD; do
if [ "$BUS" = "" -o "$ID" = "" -o "$MOD" = "" ]; then
echo "WARNING: incomplete spec in $DPDK_INTERF" \
" - BUS '$BUS' ID '$ID' MOD '$MOD'"
continue
fi
if [ "$BUS" != "pci" ]; then
echo "WARNING: incompatible bus '$BUS' in $DPDK_INTERF"
continue
fi
SYSFSPATH="/sys/bus/$BUS/devices/$ID"
if [ ! -e "$SYSFSPATH" ]; then
echo "WARNING: invalid pci ID '$ID' in $DPDK_INTERF" \
" - '$SYSFSPATH' does not exist"
continue
fi
if [ -L "$SYSFSPATH/driver" ]; then
CUR=$(readlink "$SYSFSPATH/driver")
CUR=$(basename "$CUR")
else
# device existing, but currently unregistered
CUR=""
fi
if [ "$MOD" != "$CUR" ]; then
modprobe -q "$MOD" || true
# cloud img have no linux-image-extra initially (uip_pci_generic)
# so check if the module is available (loadable/built in)
if [ -e "/sys/bus/pci/drivers/${MOD}" ]; then
echo "Reassigning pci:$ID to $MOD"
$DPDK_BIND -b "$MOD" "$ID"
else
echo "Warning: failed assigning pci:$ID," \
" module $MOD not available"
fi
else
echo "pci:$ID already assigned to $MOD"
fi
done
}
case "$1" in
start)
mount_hugetlbfs
setup_hugepages
bind_interfaces
;;
stop)
;;
reload|force-reload)
setup_hugepages
bind_interfaces
;;
status)
$DPDK_BIND --status
;;
*)
echo "Usage: $0 {start|stop|reload|force-reload|status}"
exit 1
;;
esac
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