acinclude.m4

   1 # -*- autoconf -*-
   2
   3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019 Nicira, Inc.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at:
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 dnl OVS_ENABLE_WERROR
  18 AC_DEFUN([OVS_ENABLE_WERROR],
  19   [AC_ARG_ENABLE(
  20      [Werror],
  21      [AC_HELP_STRING([--enable-Werror], [Add -Werror to CFLAGS])],
  22      [], [enable_Werror=no])
  23    AC_CONFIG_COMMANDS_PRE(
  24      [if test "X$enable_Werror" = Xyes; then
  25         OVS_CFLAGS="$OVS_CFLAGS -Werror"
  26       fi])
  27
  28    # Unless --enable-Werror is specified, report but do not fail the build
  29    # for errors reported by flake8.
  30    if test "X$enable_Werror" = Xyes; then
  31      FLAKE8_WERROR=
  32    else
  33      FLAKE8_WERROR=-
  34    fi
  35    AC_SUBST([FLAKE8_WERROR])
  36
  37    # If --enable-Werror is specified, fail the build on sparse warnings.
  38    if test "X$enable_Werror" = Xyes; then
  39      SPARSE_WERROR=-Wsparse-error
  40    else
  41      SPARSE_WERROR=
  42    fi
  43    AC_SUBST([SPARSE_WERROR])])
  44
  45 dnl OVS_CHECK_LINUX
  46 dnl
  47 dnl Configure linux kernel source tree
  48 AC_DEFUN([OVS_CHECK_LINUX], [
  49   AC_ARG_WITH([linux],
  50               [AC_HELP_STRING([--with-linux=/path/to/linux],
  51                               [Specify the Linux kernel build directory])])
  52   AC_ARG_WITH([linux-source],
  53               [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
  54                               [Specify the Linux kernel source directory
  55                                (usually figured out automatically from build
  56                                directory)])])
  57
  58   # Deprecated equivalents to --with-linux, --with-linux-source.
  59   AC_ARG_WITH([l26])
  60   AC_ARG_WITH([l26-source])
  61
  62   if test X"$with_linux" != X; then
  63     KBUILD=$with_linux
  64   elif test X"$with_l26" != X; then
  65     KBUILD=$with_l26
  66     AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
  67   else
  68     KBUILD=
  69   fi
  70
  71   if test X"$KBUILD" != X; then
  72     if test X"$with_linux_source" != X; then
  73       KSRC=$with_linux_source
  74     elif test X"$with_l26_source" != X; then
  75       KSRC=$with_l26_source
  76       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
  77     else
  78       KSRC=
  79     fi
  80   elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
  81     AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
  82   fi
  83
  84   if test -n "$KBUILD"; then
  85     KBUILD=`eval echo "$KBUILD"`
  86     case $KBUILD in
  87         /*) ;;
  88         *) KBUILD=`pwd`/$KBUILD ;;
  89     esac
  90
  91     # The build directory is what the user provided.
  92     # Make sure that it exists.
  93     AC_MSG_CHECKING([for Linux build directory])
  94     if test -d "$KBUILD"; then
  95         AC_MSG_RESULT([$KBUILD])
  96         AC_SUBST(KBUILD)
  97     else
  98         AC_MSG_RESULT([no])
  99         AC_ERROR([source dir $KBUILD doesn't exist])
 100     fi
 101
 102     # Debian breaks kernel headers into "source" header and "build" headers.
 103     # We want the source headers, but $KBUILD gives us the "build" headers.
 104     # Use heuristics to find the source headers.
 105     AC_MSG_CHECKING([for Linux source directory])
 106     if test -n "$KSRC"; then
 107       KSRC=`eval echo "$KSRC"`
 108       case $KSRC in
 109           /*) ;;
 110           *) KSRC=`pwd`/$KSRC ;;
 111       esac
 112       if test ! -e $KSRC/include/linux/kernel.h; then
 113         AC_MSG_ERROR([$KSRC is not a kernel source directory])
 114       fi
 115     else
 116       KSRC=$KBUILD
 117       if test ! -e $KSRC/include/linux/kernel.h; then
 118         # Debian kernel build Makefiles tend to include a line of the form:
 119         # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
 120         # First try to extract the source directory from this line.
 121         KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
 122         if test ! -e "$KSRC"/include/linux/kernel.h; then
 123           # Didn't work.  Fall back to name-based heuristics that used to work.
 124           case `echo "$KBUILD" | sed 's,/*$,,'` in # (
 125             */build)
 126               KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
 127               ;; # (
 128             *)
 129               KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
 130               ;;
 131           esac
 132         fi
 133       fi
 134       if test ! -e "$KSRC"/include/linux/kernel.h; then
 135         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
 136       fi
 137     fi
 138     AC_MSG_RESULT([$KSRC])
 139
 140     AC_MSG_CHECKING([for kernel version])
 141     version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
 142     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
 143     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
 144     if test X"$version" = X || test X"$patchlevel" = X; then
 145        AC_ERROR([cannot determine kernel version])
 146     elif test X"$sublevel" = X; then
 147        kversion=$version.$patchlevel
 148     else
 149        kversion=$version.$patchlevel.$sublevel
 150     fi
 151     AC_MSG_RESULT([$kversion])
 152
 153     if test "$version" -ge 5; then
 154        if test "$version" = 5 && test "$patchlevel" -le 5; then
 155           : # Linux 5.x
 156        else
 157           AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 5.5.x is not supported (please refer to the FAQ for advice)])
 158        fi
 159     elif test "$version" = 4; then
 160        : # Linux 4.x
 161     elif test "$version" = 3 && test "$patchlevel" -ge 10; then
 162        : # Linux 3.x
 163     else
 164        AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 3.10 or later is required])
 165     fi
 166     if (test ! -e "$KBUILD"/include/linux/version.h && \
 167         test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
 168        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 169         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 170         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 171     fi
 172     OVS_CHECK_LINUX_COMPAT
 173   fi
 174   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 175 ])
 176
 177 dnl OVS_CHECK_LINUX_NETLINK
 178 dnl
 179 dnl Configure Linux netlink compat.
 180 AC_DEFUN([OVS_CHECK_LINUX_NETLINK], [
 181   AC_COMPILE_IFELSE([
 182     AC_LANG_PROGRAM([#include <linux/netlink.h>], [
 183         struct nla_bitfield32 x =  { 0 };
 184     ])],
 185     [AC_DEFINE([HAVE_NLA_BITFIELD32], [1],
 186     [Define to 1 if struct nla_bitfield32 is available.])])
 187 ])
 188
 189 dnl OVS_CHECK_LINUX_TC
 190 dnl
 191 dnl Configure Linux tc compat.
 192 AC_DEFUN([OVS_CHECK_LINUX_TC], [
 193   AC_COMPILE_IFELSE([
 194     AC_LANG_PROGRAM([#include <linux/pkt_cls.h>], [
 195         int x = TCA_ACT_FLAGS;
 196     ])],
 197     [AC_DEFINE([HAVE_TCA_ACT_FLAGS], [1],
 198                [Define to 1 if TCA_ACT_FLAGS is available.])])
 199
 200   AC_CHECK_MEMBERS([struct tcf_t.firstuse], [], [], [#include <linux/pkt_cls.h>])
 201
 202   AC_COMPILE_IFELSE([
 203     AC_LANG_PROGRAM([#include <linux/tc_act/tc_vlan.h>], [
 204         int x = TCA_VLAN_PUSH_VLAN_PRIORITY;
 205     ])],
 206     [AC_DEFINE([HAVE_TCA_VLAN_PUSH_VLAN_PRIORITY], [1],
 207                [Define to 1 if TCA_VLAN_PUSH_VLAN_PRIORITY is available.])])
 208
 209   AC_COMPILE_IFELSE([
 210     AC_LANG_PROGRAM([#include <linux/tc_act/tc_mpls.h>], [
 211         int x = TCA_MPLS_TTL;
 212     ])],
 213     [AC_DEFINE([HAVE_TCA_MPLS_TTL], [1],
 214                [Define to 1 if HAVE_TCA_MPLS_TTL is available.])])
 215
 216   AC_COMPILE_IFELSE([
 217     AC_LANG_PROGRAM([#include <linux/tc_act/tc_tunnel_key.h>], [
 218         int x = TCA_TUNNEL_KEY_ENC_TTL;
 219     ])],
 220     [AC_DEFINE([HAVE_TCA_TUNNEL_KEY_ENC_TTL], [1],
 221                [Define to 1 if TCA_TUNNEL_KEY_ENC_TTL is available.])])
 222
 223   AC_COMPILE_IFELSE([
 224     AC_LANG_PROGRAM([#include <linux/tc_act/tc_pedit.h>], [
 225         int x = TCA_PEDIT_KEY_EX_HDR_TYPE_UDP;
 226     ])],
 227     [AC_DEFINE([HAVE_TCA_PEDIT_KEY_EX_HDR_TYPE_UDP], [1],
 228                [Define to 1 if TCA_PEDIT_KEY_EX_HDR_TYPE_UDP is available.])])
 229
 230   AC_COMPILE_IFELSE([
 231     AC_LANG_PROGRAM([#include <linux/tc_act/tc_skbedit.h>], [
 232         int x = TCA_SKBEDIT_FLAGS;
 233     ])],
 234     [AC_DEFINE([HAVE_TCA_SKBEDIT_FLAGS], [1],
 235                [Define to 1 if TCA_SKBEDIT_FLAGS is available.])])
 236 ])
 237
 238 dnl OVS_CHECK_LINUX_SCTP_CT
 239 dnl
 240 dnl Checks for kernels which need additional SCTP state
 241 AC_DEFUN([OVS_CHECK_LINUX_SCTP_CT], [
 242   AC_COMPILE_IFELSE([
 243     AC_LANG_PROGRAM([#include <linux/netfilter/nfnetlink.h>
 244 #include <linux/netfilter/nfnetlink_conntrack.h>
 245 #include <linux/netfilter/nf_conntrack_common.h>
 246 #include <linux/netfilter/nf_conntrack_sctp.h>], [
 247         int x = SCTP_CONNTRACK_HEARTBEAT_SENT;
 248     ])],
 249     [AC_DEFINE([HAVE_SCTP_CONNTRACK_HEARTBEATS], [1],
 250                [Define to 1 if SCTP_CONNTRACK_HEARTBEAT_SENT is available.])])
 251 ])
 252
 253 dnl OVS_FIND_DEPENDENCY(FUNCTION, SEARCH_LIBS, NAME_TO_PRINT)
 254 dnl
 255 dnl Check for a function in a library list.
 256 AC_DEFUN([OVS_FIND_DEPENDENCY], [
 257   AC_SEARCH_LIBS([$1], [$2], [], [
 258     AC_MSG_ERROR([unable to find $3, install the dependency package])
 259   ])
 260 ])
 261
 262 dnl OVS_CHECK_LINUX_AF_XDP
 263 dnl
 264 dnl Check both Linux kernel AF_XDP and libbpf support
 265 AC_DEFUN([OVS_CHECK_LINUX_AF_XDP], [
 266   AC_ARG_ENABLE([afxdp],
 267                 [AC_HELP_STRING([--enable-afxdp], [Enable AF-XDP support])],
 268                 [], [enable_afxdp=no])
 269   AC_MSG_CHECKING([whether AF_XDP is enabled])
 270   if test "$enable_afxdp" != yes; then
 271     AC_MSG_RESULT([no])
 272     AF_XDP_ENABLE=false
 273   else
 274     AC_MSG_RESULT([yes])
 275     AF_XDP_ENABLE=true
 276
 277     AC_CHECK_HEADER([bpf/libbpf.h], [],
 278       [AC_MSG_ERROR([unable to find bpf/libbpf.h for AF_XDP support])])
 279
 280     AC_CHECK_HEADER([linux/if_xdp.h], [],
 281       [AC_MSG_ERROR([unable to find linux/if_xdp.h for AF_XDP support])])
 282
 283     AC_CHECK_HEADER([bpf/xsk.h], [],
 284       [AC_MSG_ERROR([unable to find bpf/xsk.h for AF_XDP support])])
 285
 286     AC_CHECK_FUNCS([pthread_spin_lock], [],
 287       [AC_MSG_ERROR([unable to find pthread_spin_lock for AF_XDP support])])
 288
 289     OVS_FIND_DEPENDENCY([numa_alloc_onnode], [numa], [libnuma])
 290
 291     AC_DEFINE([HAVE_AF_XDP], [1],
 292               [Define to 1 if AF_XDP support is available and enabled.])
 293     LIBBPF_LDADD=" -lbpf -lelf"
 294     AC_SUBST([LIBBPF_LDADD])
 295
 296     AC_CHECK_DECL([xsk_ring_prod__needs_wakeup], [
 297       AC_DEFINE([HAVE_XDP_NEED_WAKEUP], [1],
 298         [XDP need wakeup support detected in xsk.h.])
 299     ], [], [[#include <bpf/xsk.h>]])
 300   fi
 301   AM_CONDITIONAL([HAVE_AF_XDP], test "$AF_XDP_ENABLE" = true)
 302 ])
 303
 304 dnl OVS_CHECK_DPDK
 305 dnl
 306 dnl Configure DPDK source tree
 307 AC_DEFUN([OVS_CHECK_DPDK], [
 308   AC_ARG_WITH([dpdk],
 309               [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
 310                               [Specify the DPDK build directory])],
 311               [have_dpdk=true])
 312
 313   AC_MSG_CHECKING([whether dpdk is enabled])
 314   if test "$have_dpdk" != true || test "$with_dpdk" = no; then
 315     AC_MSG_RESULT([no])
 316     DPDKLIB_FOUND=false
 317   else
 318     AC_MSG_RESULT([yes])
 319     case "$with_dpdk" in
 320       yes)
 321         DPDK_AUTO_DISCOVER="true"
 322         PKG_CHECK_MODULES_STATIC([DPDK], [libdpdk], [
 323             DPDK_INCLUDE="$DPDK_CFLAGS"
 324             DPDK_LIB="$DPDK_LIBS"], [
 325             DPDK_INCLUDE="-I/usr/local/include/dpdk -I/usr/include/dpdk"
 326             DPDK_LIB="-ldpdk"])
 327         ;;
 328       *)
 329         DPDK_AUTO_DISCOVER="false"
 330         DPDK_INCLUDE_PATH="$with_dpdk/include"
 331         # If 'with_dpdk' is passed install directory, point to headers
 332         # installed in $DESTDIR/$prefix/include/dpdk
 333         if test -e "$DPDK_INCLUDE_PATH/rte_config.h"; then
 334            DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH"
 335         elif test -e "$DPDK_INCLUDE_PATH/dpdk/rte_config.h"; then
 336            DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH/dpdk"
 337         fi
 338         DPDK_LIB_DIR="$with_dpdk/lib"
 339         DPDK_LIB="-ldpdk"
 340         ;;
 341     esac
 342
 343     ovs_save_CFLAGS="$CFLAGS"
 344     ovs_save_LDFLAGS="$LDFLAGS"
 345     CFLAGS="$CFLAGS $DPDK_INCLUDE"
 346     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 347       LDFLAGS="$LDFLAGS -L${DPDK_LIB_DIR}"
 348     fi
 349
 350     AC_CHECK_HEADERS([rte_config.h], [], [
 351       AC_MSG_ERROR([unable to find rte_config.h in $with_dpdk])
 352     ], [AC_INCLUDES_DEFAULT])
 353
 354     AC_CHECK_DECLS([RTE_LIBRTE_VHOST_NUMA, RTE_EAL_NUMA_AWARE_HUGEPAGES], [
 355       OVS_FIND_DEPENDENCY([get_mempolicy], [numa], [libnuma])
 356     ], [], [[#include <rte_config.h>]])
 357
 358     AC_CHECK_DECL([RTE_LIBRTE_PMD_PCAP], [
 359       OVS_FIND_DEPENDENCY([pcap_dump_close], [pcap], [libpcap])
 360     ], [], [[#include <rte_config.h>]])
 361
 362     AC_CHECK_DECL([RTE_LIBRTE_PMD_AF_XDP], [
 363       LIBBPF_LDADD="-lbpf"
 364     ], [], [[#include <rte_config.h>]])
 365
 366     AC_CHECK_DECL([RTE_LIBRTE_VHOST_NUMA], [
 367       AC_DEFINE([VHOST_NUMA], [1], [NUMA Aware vHost support detected in DPDK.])
 368     ], [], [[#include <rte_config.h>]])
 369
 370     AC_CHECK_DECL([RTE_LIBRTE_MLX5_PMD], [dnl found
 371       OVS_FIND_DEPENDENCY([mnl_attr_put], [mnl], [libmnl])
 372       AC_CHECK_DECL([RTE_IBVERBS_LINK_DLOPEN], [], [dnl not found
 373         OVS_FIND_DEPENDENCY([mlx5dv_create_wq], [mlx5], [libmlx5])
 374         OVS_FIND_DEPENDENCY([verbs_init_cq], [ibverbs], [libibverbs])
 375       ], [[#include <rte_config.h>]])
 376     ], [], [[#include <rte_config.h>]])
 377
 378     AC_CHECK_DECL([RTE_LIBRTE_MLX4_PMD], [dnl found
 379       AC_CHECK_DECL([RTE_IBVERBS_LINK_DLOPEN], [], [dnl not found
 380         OVS_FIND_DEPENDENCY([mlx4dv_init_obj], [mlx4], [libmlx4])
 381         OVS_FIND_DEPENDENCY([verbs_init_cq], [ibverbs], [libibverbs])
 382       ], [[#include <rte_config.h>]])
 383     ], [], [[#include <rte_config.h>]])
 384
 385     # DPDK uses dlopen to load plugins.
 386     OVS_FIND_DEPENDENCY([dlopen], [dl], [libdl])
 387
 388     AC_MSG_CHECKING([whether linking with dpdk works])
 389     LIBS="$DPDK_LIB $LIBS"
 390     AC_LINK_IFELSE(
 391       [AC_LANG_PROGRAM([#include <rte_config.h>
 392                         #include <rte_eal.h>],
 393                        [int rte_argc; char ** rte_argv;
 394                         rte_eal_init(rte_argc, rte_argv);])],
 395       [AC_MSG_RESULT([yes])
 396        DPDKLIB_FOUND=true],
 397       [AC_MSG_RESULT([no])
 398        if test "$DPDK_AUTO_DISCOVER" = "true"; then
 399          AC_MSG_ERROR(m4_normalize([
 400             Could not find DPDK library in default search path, Use --with-dpdk
 401             to specify the DPDK library installed in non-standard location]))
 402        else
 403          AC_MSG_ERROR([Could not find DPDK libraries in $DPDK_LIB_DIR])
 404        fi
 405       ])
 406
 407     CFLAGS="$ovs_save_CFLAGS"
 408     LDFLAGS="$ovs_save_LDFLAGS"
 409     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 410       OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
 411     fi
 412     OVS_CFLAGS="$OVS_CFLAGS $DPDK_INCLUDE"
 413     OVS_ENABLE_OPTION([-mssse3])
 414
 415     # DPDK pmd drivers are not linked unless --whole-archive is used.
 416     #
 417     # This happens because the rest of the DPDK code doesn't use any symbol in
 418     # the pmd driver objects, and the drivers register themselves using an
 419     # __attribute__((constructor)) function.
 420     #
 421     # These options are specified inside a single -Wl directive to prevent
 422     # autotools from reordering them.
 423     #
 424     # OTOH newer versions of dpdk pkg-config (generated with Meson)
 425     # will already have flagged just the right set of libs with
 426     # --whole-archive - in those cases do not wrap it once more.
 427     case "$DPDK_LIB" in
 428       *whole-archive*) DPDK_vswitchd_LDFLAGS=$DPDK_LIB;;
 429       *) DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
 430     esac
 431     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 432     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 433   fi
 434
 435   AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
 436 ])
 437
 438 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 439 dnl
 440 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 441 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 442 dnl <REGEX> translated to uppercase.
 443 AC_DEFUN([OVS_GREP_IFELSE], [
 444   AC_MSG_CHECKING([whether $2 matches in $1])
 445   if test -f $1; then
 446     grep '$2' $1 >/dev/null 2>&1
 447     status=$?
 448     case $status in
 449       0)
 450         AC_MSG_RESULT([yes])
 451         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 452         ;;
 453       1)
 454         AC_MSG_RESULT([no])
 455         $4
 456         ;;
 457       *)
 458         AC_MSG_ERROR([grep exited with status $status])
 459         ;;
 460     esac
 461   else
 462     AC_MSG_RESULT([file not found])
 463     $4
 464   fi
 465 ])
 466
 467 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 468 dnl
 469 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
 470 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
 471 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 472 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
 473 dnl translated to uppercase.
 474 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
 475   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 476   if test -f $1; then
 477     awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
 478     status=$?
 479     case $status in
 480       0)
 481         AC_MSG_RESULT([yes])
 482         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 483         ;;
 484       1)
 485         AC_MSG_RESULT([no])
 486         $5
 487         ;;
 488       *)
 489         AC_MSG_ERROR([grep exited with status $status])
 490         ;;
 491     esac
 492   else
 493     AC_MSG_RESULT([file not found])
 494     $5
 495   fi
 496 ])
 497
 498 dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
 499 dnl
 500 dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
 501 dnl the function signature starting from the line matching FUNCTION
 502 dnl and ending with the line containing the closing parenthesis.  If
 503 dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH.  If
 504 dnl IF-MATCH is empty then it defines to
 505 dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
 506 dnl <REGEX> translated to uppercase.
 507 AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
 508   AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
 509   if test -f $1; then
 510     awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
 511     status=$?
 512     case $status in
 513       0)
 514         AC_MSG_RESULT([yes])
 515         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 516         ;;
 517       1)
 518         AC_MSG_RESULT([no])
 519         $5
 520         ;;
 521       *)
 522         AC_MSG_ERROR([grep exited with status $status])
 523         ;;
 524     esac
 525   else
 526     AC_MSG_RESULT([file not found])
 527     $5
 528   fi
 529 ])
 530
 531 dnl OVS_FIND_OP_PARAM_IFELSE(FILE, OP, REGEX, [IF-MATCH], [IF-NO-MATCH])
 532 dnl
 533 dnl Looks for OP in FILE. If it is found, greps for REGEX within the
 534 dnl OP definition. If this is successful, runs IF-MATCH, otherwise
 535 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 536 dnl OVS_DEFINE(HAVE_<OP>_WITH_<REGEX>), with <OP> and <REGEX>
 537 dnl translated to uppercase.
 538 AC_DEFUN([OVS_FIND_OP_PARAM_IFELSE], [
 539   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 540   if test -f $1; then
 541     awk '/$2[[ \t\n]]*\)\(/,/;/' $1 2>/dev/null | grep '$3' >/dev/null
 542     status=$?
 543     case $status in
 544       0)
 545         AC_MSG_RESULT([yes])
 546         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 547         ;;
 548       1)
 549         AC_MSG_RESULT([no])
 550         $5
 551         ;;
 552       *)
 553         AC_MSG_ERROR([grep exited with status $status])
 554         ;;
 555     esac
 556   else
 557     AC_MSG_RESULT([file not found])
 558     $5
 559   fi
 560 ])
 561
 562 dnl OVS_DEFINE(NAME)
 563 dnl
 564 dnl Defines NAME to 1 in kcompat.h.
 565 AC_DEFUN([OVS_DEFINE], [
 566   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 567 ])
 568
 569 dnl OVS_CHECK_LINUX_COMPAT
 570 dnl
 571 dnl Runs various Autoconf checks on the Linux kernel source in
 572 dnl the directory in $KBUILD.
 573 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 574   rm -f datapath/linux/kcompat.h.new
 575   mkdir -p datapath/linux
 576   : > datapath/linux/kcompat.h.new
 577
 578   echo '#include <linux/version.h>
 579 #ifndef RHEL_RELEASE_CODE
 580 #define RHEL_RELEASE_CODE 0
 581 #define RHEL_RELEASE_VERSION(a, b) 0
 582 #endif' >> datapath/linux/kcompat.h.new
 583
 584   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 585                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 586
 587   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6_get_cookie],
 588                   [OVS_DEFINE([HAVE_RT6_GET_COOKIE])])
 589
 590   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
 591                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
 592   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup_flow.*net],
 593                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_FLOW_NET])])
 594   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
 595   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup_flow])
 596
 597   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 598   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 599   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
 600
 601   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [static_branch_unlikely(],
 602                   [OVS_DEFINE([HAVE_UPSTREAM_STATIC_KEY])])
 603   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [DEFINE_STATIC_KEY_FALSE],
 604                   [OVS_DEFINE([HAVE_DEFINE_STATIC_KEY])])
 605
 606   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 607   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 608
 609   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
 610   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
 611   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 612   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 613   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 614   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_hwaccel_clear_tag])
 615
 616   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 617   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
 618   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 619                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 620   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
 621                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
 622
 623   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
 624                   [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
 625   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
 626                   [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
 627   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 628                         [ip_do_fragment], [net],
 629                         [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
 630   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 631                         [ip_local_out], [net],
 632                         [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
 633
 634   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 635
 636   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
 637                   [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
 638   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
 639   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
 640                   [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
 641   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
 642                   [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
 643   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
 644   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
 645   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 646                         [frags_work])
 647   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 648                         [rwlock])
 649   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
 650                         [list_evictor])
 651   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
 652   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
 653                         [sub_frag_mem_limit], [struct.netns_frags],
 654                         [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
 655   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
 656                   [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
 657   OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
 658                   [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
 659
 660   dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
 661   dnl OVS does not really need ipv6 label field, but its presence signifies that
 662   dnl the stack has all required ipv6 support.
 663   dnl OVS also does not need dst_cache But this dependency allows us to write
 664   dnl much cleaner code.
 665
 666   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
 667                         [label],
 668                         [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
 669                                          [iptunnel_pull_offloads],
 670                         [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 671                         [OVS_GREP_IFELSE([$KSRC/include/net/erspan.h], [erspan_md2],
 672                                          [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])])
 673
 674   OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 675                   [OVS_DEFINE([USE_BUILTIN_DST_CACHE])])
 676   OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
 677                   [OVS_DEFINE([MPLS_HEADER_IS_L3])])
 678   OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
 679                   [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
 680   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
 681   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 682   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 683   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 684   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
 685   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 686   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_gso_error_unwind])
 687   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 688   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
 689   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
 690                   [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
 691   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
 692   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
 693   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_udp_tunnel_add])
 694   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 695   dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
 696   dnl So check type of tstats.
 697   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
 698                   [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
 699   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
 700                   [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
 701   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_csum_hwoffload_help])
 702   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
 703   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
 704                   [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
 705   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
 706   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
 707   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 708                         [extended])
 709   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 710                         [netdev_master_upper_dev_link], [upper_priv],
 711                         [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
 712   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 713                   [netdev_master_upper_dev_link_rh],
 714                   [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_RH])])
 715
 716   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 717                         [max_mtu])
 718   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops_extended],
 719                         [ndo_change_mtu], [OVS_DEFINE([HAVE_RHEL7_MAX_MTU])])
 720   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 721                         [dev_change_flags], [extack],
 722                         [OVS_DEFINE([HAVE_DEV_CHANGE_FLAGS_TAKES_EXTACK])])
 723
 724   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
 725   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state],
 726                         [struct net ], [OVS_DEFINE([HAVE_NF_HOOK_STATE_NET])])
 727   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
 728   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
 729                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
 730   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
 731                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
 732   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 733                         [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
 734   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [NFPROTO_INET])
 735   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [CONFIG_NF_NAT_NEEDED])
 736
 737
 738   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
 739                         [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 740
 741   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 742                         [nf_conn], [struct timer_list[[ \t]]*timeout],
 743                         [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
 744   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 745                   [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
 746
 747   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 748                   [nf_ct_tmpl_alloc], [nf_conntrack_zone],
 749                   [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
 750   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 751                   [nf_ct_get_tuplepr], [struct.net],
 752                   [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
 753   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 754                   [nf_ct_set])
 755   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 756                   [nf_ct_is_untracked])
 757   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 758                   [nf_ct_invert_tuplepr])
 759   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
 760                   [nf_ct_zone_init])
 761   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
 762                   [net_ns_get])
 763   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 764                   [nf_connlabels_get])
 765   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 766                   [nf_connlabels_get], [int bit],
 767                   [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
 768   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 769                         [nf_conn_labels], [words])
 770   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
 771   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
 772   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_range2])
 773   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_packet],
 774                   [OVS_DEFINE([HAVE_UPSTREAM_NF_NAT])])
 775   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
 776   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h], [nf_conncount_gc_list],
 777                   [OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h],
 778                                    [int nf_conncount_add],
 779                                    [], [OVS_DEFINE([HAVE_UPSTREAM_NF_CONNCOUNT])])])
 780   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h], [nf_ct_set_timeout])
 781   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h], [struct nf_ct_timeout],
 782                   [OVS_DEFINE([HAVE_NF_CT_TIMEOUT])])
 783   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h],
 784                         [\(*nf_ct_timeout_find_get_hook\)], [net],
 785                         [OVS_DEFINE([HAVE_NF_CT_TIMEOUT_FIND_GET_HOOK_NET])])
 786
 787   OVS_GREP_IFELSE([$KSRC/include/linux/random.h],
 788                   [prandom_u32[[\(]]],
 789                   [OVS_DEFINE([HAVE_PRANDOM_U32])])
 790   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
 791
 792   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
 793   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
 794   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
 795                   [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
 796   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
 797
 798   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 799                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 800                                    [rcu_read_lock_held])])
 801   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 802   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [net_rwsem])
 803   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h],
 804                         [rtnl_create_link], [extack],
 805                         [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_TAKES_EXTACK])])
 806   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [nf_reset_ct])
 807
 808   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 809   # is necessary because some versions of this header remove the
 810   # member but retain the kerneldoc comment that describes it (which
 811   # starts with @).  The brackets must be doubled because of m4
 812   # quoting rules.
 813   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 814                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 815   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
 816   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
 817   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
 818   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
 819   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
 820   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 821   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 822                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 823   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 824                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 825   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 826                   [skb_copy_from_linear_data_offset])
 827   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 828                   [skb_reset_tail_pointer])
 829   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 830   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 831                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 832   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 833   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 834   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 835   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 836   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 837   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 838   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 839   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
 840                   [OVS_DEFINE([HAVE_SKB_GET_HASH])])
 841   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 842   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 843                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 844   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
 845                   [OVS_DEFINE([HAVE_L4_RXHASH])])
 846   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 847   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 848   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
 849   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 850   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
 851   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
 852   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
 853   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
 854   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_put_zero])
 855
 856   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 857                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 858   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 859                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 860
 861   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 862   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 863
 864   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
 865   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
 866
 867   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 868   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 869   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 870   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 871                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 872   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 873   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
 874                   [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
 875   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_validate_flags])
 876   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
 877                         [genl_notify], [net],
 878                         [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
 879
 880
 881   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
 882                         [genl_multicast_group], [id])
 883   OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
 884
 885   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 886   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 887   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 888   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
 889   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
 890   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
 891                   [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
 892   OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
 893                   [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
 894
 895   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
 896   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 897   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 898   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 899   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 900   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
 901   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 902   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 903   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_nest_start_noflag])
 904   OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
 905                   [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
 906   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
 907                         [nla_parse], [netlink_ext_ack],
 908                         [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
 909
 910   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 911
 912   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 913   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 914   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
 915   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
 916   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
 917
 918   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/dst_metadata.h],
 919                         [metadata_dst_alloc], [metadata_type])
 920
 921   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 922
 923   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 924                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 925   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 926                   [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
 927                                    [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
 928   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
 929   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
 930   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
 931                   [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
 932   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
 933                         [gro_receive])
 934
 935   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
 936                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 937   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 938                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 939
 940   OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
 941   OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
 942   OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
 943                   [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
 944   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
 945                         [udp_add_offload], [net],
 946                         [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
 947   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 948                         [nf_defrag_ipv6_enable], [net],
 949                         [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
 950   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [family_list],
 951                         [OVS_DEFINE([HAVE_GENL_FAMILY_LIST])])
 952   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 953                         [needs_free_netdev],
 954                         [OVS_DEFINE([HAVE_NEEDS_FREE_NETDEV])])
 955   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_dev], [cfg],
 956                         [OVS_DEFINE([HAVE_VXLAN_DEV_CFG])])
 957   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
 958                   [nf_conntrack_helper_put],
 959                   [OVS_DEFINE(HAVE_NF_CONNTRACK_HELPER_PUT)])
 960   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
 961                   [nf_nat_helper_try_module_get])
 962   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
 963                   [nf_nat_helper_put])
 964   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],[[[[:space:]]]SKB_GSO_UDP[[[:space:]]]],
 965                   [OVS_DEFINE([HAVE_SKB_GSO_UDP])])
 966   OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
 967                   [OVS_DEFINE([HAVE_DST_NOCACHE])])
 968   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
 969                         [extack],
 970                   [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
 971   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 972                         [list],
 973                         [OVS_DEFINE([HAVE_LIST_IN_NF_HOOK_OPS])])
 974   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netfilter/nf_conntrack_common.h],
 975                   [IP_CT_UNTRACKED])
 976   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 977                         [netdev_master_upper_dev_link], [extack],
 978                         [OVS_DEFINE([HAVE_UPPER_DEV_LINK_EXTACK])])
 979   OVS_GREP_IFELSE([$KSRC/include/linux/compiler_types.h],
 980                   [__LINUX_COMPILER_TYPES_H],
 981                   [OVS_DEFINE([HAVE_LINUX_COMPILER_TYPES_H])])
 982   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 983                   [ktime_get_ts64],
 984                   [OVS_DEFINE([HAVE_KTIME_GET_TS64])])
 985   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h],
 986                   [EXPORT_SYMBOL_GPL(peernet2id_alloc)],
 987                   [OVS_DEFINE([HAVE_PEERNET2ID_ALLOC])])
 988   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 989                   [ktime_get_ns],
 990                   [OVS_DEFINE([HAVE_KTIME_GET_NS])])
 991   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h],
 992                   frag_percpu_counter_batch[],
 993                   [OVS_DEFINE([HAVE_FRAG_PERCPU_COUNTER_BATCH])])
 994   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 995                   [null_compute_pseudo],
 996                   [OVS_DEFINE([HAVE_NULL_COMPUTE_PSEUDO])])
 997   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 998                   [__skb_checksum_convert],
 999                   [OVS_DEFINE([HAVE_SKB_CHECKSUM_CONVERT])])
1000   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
1001                         [max_mtu],
1002                         [OVS_DEFINE([HAVE_NET_DEVICE_MAX_MTU])])
1003   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip6_tunnel.h], [__ip6_tnl_parm],
1004                         [erspan_ver],
1005                         [OVS_DEFINE([HAVE_IP6_TNL_PARM_ERSPAN_VER])])
1006   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1007                   [SKB_GSO_IPXIP6],
1008                   [OVS_DEFINE([HAVE_SKB_GSO_IPXIP6])])
1009   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ipv6.h],
1010                         [ip6_make_flowlabel], [fl6],
1011                         [OVS_DEFINE([HAVE_IP6_MAKE_FLOWLABEL_FL6])])
1012   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ipv6.h], [netns_sysctl_ipv6],
1013                         [auto_flowlabels],
1014                         [OVS_DEFINE([HAVE_NETNS_SYSCTL_IPV6_AUTO_FLOWLABELS])])
1015   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
1016                   [netif_keep_dst],
1017                   [OVS_DEFINE([HAVE_NETIF_KEEP_DST])])
1018   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
1019                         [ndo_get_iflink],
1020                         [OVS_DEFINE([HAVE_NDO_GET_IFLINK])])
1021   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1022                   [skb_set_inner_ipproto],
1023                   [OVS_DEFINE([HAVE_SKB_SET_INNER_IPPROTO])])
1024   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1025                   [tunnel_encap_types],
1026                   [OVS_DEFINE([HAVE_TUNNEL_ENCAP_TYPES])])
1027   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1028                   [IFLA_IPTUN_ENCAP_TYPE],
1029                   [OVS_DEFINE([HAVE_IFLA_IPTUN_ENCAP_TYPE])])
1030   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1031                   [IFLA_IPTUN_COLLECT_METADATA],
1032                   [OVS_DEFINE([HAVE_IFLA_IPTUN_COLLECT_METADATA])])
1033   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1034                   [IFLA_GRE_ENCAP_DPORT])
1035   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1036                   [IFLA_GRE_COLLECT_METADATA])
1037   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1038                   [IFLA_GRE_IGNORE_DF])
1039   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1040                   [IFLA_GRE_FWMARK])
1041   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1042                   [IFLA_GRE_ERSPAN_INDEX])
1043   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1044                   [IFLA_GRE_ERSPAN_HWID])
1045   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1046                   [IFLA_IPTUN_FWMARK])
1047   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
1048                         [csum_valid],
1049                         [OVS_DEFINE([HAVE_SKBUFF_CSUM_VALID])])
1050   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
1051                         [vlan_present],
1052                         [OVS_DEFINE([HAVE_SKBUFF_VLAN_PRESENT])])
1053   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1054                   [skb_checksum_simple_validate])
1055   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
1056                   [void.*ndo_get_stats64],
1057                   [OVS_DEFINE([HAVE_VOID_NDO_GET_STATS64])])
1058   OVS_GREP_IFELSE([$KSRC/include/linux/timer.h], [init_timer_deferrable],
1059                   [OVS_DEFINE([HAVE_INIT_TIMER_DEFERRABLE])])
1060   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip_tunnels.h],
1061                         [ip_tunnel_info_opts_set], [flags],
1062                         [OVS_DEFINE([HAVE_IP_TUNNEL_INFO_OPTS_SET_FLAGS])])
1063   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
1064                         [rnd],
1065                         [OVS_DEFINE([HAVE_INET_FRAGS_RND])])
1066   OVS_GREP_IFELSE([$KSRC/include/linux/overflow.h], [__LINUX_OVERFLOW_H],
1067                   [OVS_DEFINE([HAVE_OVERFLOW_H])])
1068   OVS_GREP_IFELSE([$KSRC/include/linux/overflow.h], [struct_size],
1069                   [OVS_DEFINE([HAVE_STRUCT_SIZE])])
1070   OVS_GREP_IFELSE([$KSRC/include/linux/mm.h], [kvmalloc_array],
1071                   [OVS_DEFINE([HAVE_KVMALLOC_ARRAY])])
1072   OVS_GREP_IFELSE([$KSRC/include/linux/mm.h], [kvmalloc_node],
1073                   [OVS_DEFINE([HAVE_KVMALLOC_NODE])])
1074   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
1075                   [nf_conntrack_l3proto],
1076                   [OVS_DEFINE([HAVE_NF_CONNTRACK_L3PROATO_H])])
1077   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_core.h],
1078                         [nf_conntrack_in], [nf_hook_state],
1079                         [OVS_DEFINE([HAVE_NF_CONNTRACK_IN_TAKES_NF_HOOK_STATE])])
1080   OVS_GREP_IFELSE([$KSRC/include/net/ipv6_frag.h], [IP6_DEFRAG_CONNTRACK_IN],
1081                   [OVS_DEFINE([HAVE_IPV6_FRAG_H])])
1082   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
1083                         [nf_ct_helper_ext_add], [nf_conntrack_helper],
1084                         [OVS_DEFINE([HAVE_NF_CT_HELPER_EXT_ADD_TAKES_HELPER])])
1085   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_calc_hlen],
1086                   [OVS_DEFINE([HAVE_GRE_CALC_HLEN])])
1087   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [ip_gre_calc_hlen],
1088                   [OVS_DEFINE([HAVE_IP_GRE_CALC_HLEN])])
1089   OVS_GREP_IFELSE([$KSRC/include/linux/rbtree.h], [rb_link_node_rcu],
1090                   [OVS_DEFINE([HAVE_RBTREE_RB_LINK_NODE_RCU])])
1091   OVS_GREP_IFELSE([$KSRC/include/net/dst_ops.h], [bool confirm_neigh],
1092                   [OVS_DEFINE([HAVE_DST_OPS_CONFIRM_NEIGH])])
1093   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [fqdir],
1094                   [OVS_DEFINE([HAVE_INET_FRAG_FQDIR])])
1095   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h], [genl_ops],
1096                         [policy],
1097                         [OVS_DEFINE([HAVE_GENL_OPS_POLICY])])
1098   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h],
1099                   [nla_parse_deprecated_strict],
1100                   [OVS_DEFINE([HAVE_NLA_PARSE_DEPRECATED_STRICT])])
1101   OVS_FIND_OP_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h],
1102                            [validate], [extack],
1103                            [OVS_DEFINE([HAVE_RTNLOP_VALIDATE_WITH_EXTACK])])
1104
1105   if cmp -s datapath/linux/kcompat.h.new \
1106             datapath/linux/kcompat.h >/dev/null 2>&1; then
1107     rm datapath/linux/kcompat.h.new
1108   else
1109     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
1110   fi
1111 ])
1112
1113 dnl Checks for net/if_dl.h.
1114 dnl
1115 dnl (We use this as a proxy for checking whether we're building on FreeBSD
1116 dnl or NetBSD.)
1117 AC_DEFUN([OVS_CHECK_IF_DL],
1118   [AC_CHECK_HEADER([net/if_dl.h],
1119                    [HAVE_IF_DL=yes],
1120                    [HAVE_IF_DL=no])
1121    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
1122    if test "$HAVE_IF_DL" = yes; then
1123       AC_DEFINE([HAVE_IF_DL], [1],
1124                 [Define to 1 if net/if_dl.h is available.])
1125
1126       # On these platforms we use libpcap to access network devices.
1127       AC_SEARCH_LIBS([pcap_open_live], [pcap])
1128    fi])
1129
1130 dnl Checks for buggy strtok_r.
1131 dnl
1132 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
1133 dnl with optimization that can cause segfaults:
1134 dnl
1135 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
1136 AC_DEFUN([OVS_CHECK_STRTOK_R],
1137   [AC_CACHE_CHECK(
1138      [whether strtok_r macro segfaults on some inputs],
1139      [ovs_cv_strtok_r_bug],
1140      [AC_RUN_IFELSE(
1141         [AC_LANG_PROGRAM([#include <stdio.h>
1142                           #include <string.h>
1143                          ],
1144                          [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
1145                            /* Assume bug is present, because relatively minor
1146                               changes in compiler settings (e.g. optimization
1147                               level) can make it crop up. */
1148                            return 1;
1149                            #else
1150                            char string[] = ":::";
1151                            char *save_ptr = (char *) 0xc0ffee;
1152                            char *token1, *token2;
1153                            token1 = strtok_r(string, ":", &save_ptr);
1154                            token2 = strtok_r(NULL, ":", &save_ptr);
1155                            freopen ("/dev/null", "w", stdout);
1156                            printf ("%s %s\n", token1, token2);
1157                            return 0;
1158                            #endif
1159                           ]])],
1160         [ovs_cv_strtok_r_bug=no],
1161         [ovs_cv_strtok_r_bug=yes],
1162         [ovs_cv_strtok_r_bug=yes])])
1163    if test $ovs_cv_strtok_r_bug = yes; then
1164      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
1165                [Define if strtok_r macro segfaults on some inputs])
1166    fi
1167 ])
1168
1169 dnl ----------------------------------------------------------------------
1170 dnl These macros are from GNU PSPP, with the following original license:
1171 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
1172 dnl This file is free software; the Free Software Foundation
1173 dnl gives unlimited permission to copy and/or distribute it,
1174 dnl with or without modifications, as long as this notice is preserved.
1175
1176 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
1177   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-= ], [__])])dnl
1178   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
1179     [ovs_save_CFLAGS="$CFLAGS"
1180      dnl Include -Werror in the compiler options, because without -Werror
1181      dnl clang's GCC-compatible compiler driver does not return a failure
1182      dnl exit status even though it complains about options it does not
1183      dnl understand.
1184      dnl
1185      dnl Also, check stderr as gcc exits with status 0 for options
1186      dnl rejected at getopt level.
1187      dnl    % touch /tmp/a.c
1188      dnl    % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
1189      dnl    gcc: unrecognized option '-Qunused-arguments'
1190      dnl    0
1191      dnl    %
1192      dnl
1193      dnl In addition, GCC does not complain about a -Wno-<foo> option that
1194      dnl it does not understand, unless it has another error to report, so
1195      dnl instead of testing for -Wno-<foo>, test for the positive version.
1196      CFLAGS="$CFLAGS $WERROR m4_bpatsubst([$1], [-Wno-], [-W])"
1197      AC_COMPILE_IFELSE(
1198        [AC_LANG_SOURCE([int x;])],
1199        [if test -s conftest.err && grep "unrecognized option" conftest.err
1200         then
1201           ovs_cv_name[]=no
1202         else
1203           ovs_cv_name[]=yes
1204         fi],
1205        [ovs_cv_name[]=no])
1206      CFLAGS="$ovs_save_CFLAGS"])
1207   if test $ovs_cv_name = yes; then
1208     m4_if([$2], [], [:], [$2])
1209   else
1210     m4_if([$3], [], [:], [$3])
1211   fi
1212 ])
1213
1214 dnl OVS_CHECK_WERROR
1215 dnl
1216 dnl Check whether the C compiler accepts -Werror.
1217 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
1218 AC_DEFUN([OVS_CHECK_WERROR],
1219   [WERROR=
1220    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
1221
1222 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
1223 dnl Check whether the given C compiler OPTION is accepted.
1224 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
1225 AC_DEFUN([OVS_CHECK_CC_OPTION],
1226   [AC_REQUIRE([OVS_CHECK_WERROR])
1227    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
1228
1229 dnl OVS_ENABLE_OPTION([OPTION])
1230 dnl Check whether the given C compiler OPTION is accepted.
1231 dnl If so, add it to WARNING_FLAGS.
1232 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
1233 AC_DEFUN([OVS_ENABLE_OPTION],
1234   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
1235    AC_SUBST([WARNING_FLAGS])])
1236
1237 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
1238 dnl Check whether the given C compiler OPTION is accepted.
1239 dnl If so, enable the given Automake CONDITIONAL.
1240
1241 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
1242 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
1243   [OVS_CHECK_CC_OPTION(
1244     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
1245    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
1246 dnl ----------------------------------------------------------------------
1247
1248 dnl Check for too-old XenServer.
1249 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
1250   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
1251     [if test -e /etc/redhat-release; then
1252        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
1253      fi
1254      if test -z "$ovs_cv_xsversion"; then
1255        ovs_cv_xsversion=none
1256      fi])
1257   case $ovs_cv_xsversion in
1258     none)
1259       ;;
1260
1261     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
1262     [[6-9]]* |                           dnl XenServer 6 or later
1263     5.[[7-9]]* |                         dnl XenServer 5.7 or later
1264     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
1265     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
1266     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
1267       ;;
1268
1269     *)
1270       AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported.  (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
1271       ;;
1272   esac])
1273
1274 dnl OVS_CHECK_SPARSE_TARGET
1275 dnl
1276 dnl The "cgcc" script from "sparse" isn't very good at detecting the
1277 dnl target for which the code is being built.  This helps it out.
1278 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
1279   [AC_CACHE_CHECK(
1280     [target hint for cgcc],
1281     [ac_cv_sparse_target],
1282     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
1283        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
1284        [x86_64-*], [ac_cv_sparse_target=x86_64],
1285        [ac_cv_sparse_target=other])])
1286    AS_CASE([$ac_cv_sparse_target],
1287      [x86], [SPARSEFLAGS= CGCCFLAGS="-target=i86 -target=host_os_specs"],
1288      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS="-target=x86_64 -target=host_os_specs"],
1289      [SPARSEFLAGS= CGCCFLAGS=])
1290
1291    dnl Get the default defines for vector instructions from compiler to
1292    dnl allow "sparse" correctly check the same code that will be built.
1293    dnl Required for checking DPDK headers.
1294    AC_MSG_CHECKING([vector options for cgcc])
1295    VECTOR=$($CC -dM -E - < /dev/null | grep -E "MMX|SSE|AVX" | \
1296             cut -c 9- | sed 's/ /=/' | sed 's/^/-D/' | tr '\n' ' ')
1297    AC_MSG_RESULT([$VECTOR])
1298    CGCCFLAGS="$CGCCFLAGS $VECTOR"
1299
1300    AC_SUBST([SPARSEFLAGS])
1301    AC_SUBST([CGCCFLAGS])])
1302
1303 dnl OVS_SPARSE_EXTRA_INCLUDES
1304 dnl
1305 dnl The cgcc script from "sparse" does not search gcc's default
1306 dnl search path. Get the default search path from GCC and pass
1307 dnl them to sparse.
1308 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
1309     AC_SUBST([SPARSE_EXTRA_INCLUDES],
1310            [`$CC -v -E - </dev/null 2>&1 >/dev/null | sed -n -e '/^#include.*search.*starts.*here:/,/^End.*of.*search.*list\./s/^ \(.*\)/-I \1/p' |grep -v /usr/lib | grep -x -v '\-I /usr/include' | tr \\\n ' ' `] ))
1311
1312 dnl OVS_ENABLE_SPARSE
1313 AC_DEFUN([OVS_ENABLE_SPARSE],
1314   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
1315    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
1316    : ${SPARSE=sparse}
1317    AC_SUBST([SPARSE])
1318    AC_CONFIG_COMMANDS_PRE(
1319      [CC='$(if $(C:0=),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) $(SPARSE_WERROR) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'])
1320
1321    AC_ARG_ENABLE(
1322      [sparse],
1323      [AC_HELP_STRING([--enable-sparse], [Run "sparse" by default])],
1324      [], [enable_sparse=no])
1325    AM_CONDITIONAL([ENABLE_SPARSE_BY_DEFAULT], [test $enable_sparse = yes])])
1326
1327 dnl OVS_CTAGS_IDENTIFIERS
1328 dnl
1329 dnl ctags ignores symbols with extras identifiers. This builds a list of
1330 dnl specially handled identifiers to be ignored.
1331 AC_DEFUN([OVS_CTAGS_IDENTIFIERS],
1332     AC_SUBST([OVS_CTAGS_IDENTIFIERS_LIST],
1333            [`printf %s '-I "'; sed -n 's/^#define \(OVS_[A-Z_]\+\)(\.\.\.)$/\1+/p' ${srcdir}/include/openvswitch/compiler.h  | tr \\\n ' ' ; printf '"'`] ))
1334
1335 dnl OVS_PTHREAD_SET_NAME
1336 dnl
1337 dnl This checks for three known variants of pthreads functions for setting
1338 dnl the name of the current thread:
1339 dnl
1340 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
1341 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
1342 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
1343 dnl
1344 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
1345 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
1346 dnl provide to it.
1347 dnl
1348 dnl This macro defines:
1349 dnl
1350 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
1351 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
1352 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
1353 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
1354   [AC_CHECK_FUNCS([pthread_set_name_np])
1355    if test $ac_cv_func_pthread_set_name_np != yes; then
1356      AC_CACHE_CHECK(
1357        [for pthread_setname_np() variant],
1358        [ovs_cv_pthread_setname_np],
1359        [AC_LINK_IFELSE(
1360          [AC_LANG_PROGRAM([#include <pthread.h>
1361   ], [pthread_setname_np(pthread_self(), "name");])],
1362          [ovs_cv_pthread_setname_np=glibc],
1363          [AC_LINK_IFELSE(
1364            [AC_LANG_PROGRAM([#include <pthread.h>
1365 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
1366            [ovs_cv_pthread_setname_np=netbsd],
1367            [ovs_cv_pthread_setname_np=none])])])
1368      case $ovs_cv_pthread_setname_np in # (
1369        glibc)
1370           AC_DEFINE(
1371             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
1372             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
1373           ;; # (
1374        netbsd)
1375           AC_DEFINE(
1376             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
1377             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
1378           ;;
1379      esac
1380    fi])
1381
1382 dnl OVS_CHECK_LINUX_HOST.
1383 dnl
1384 dnl Checks whether we're building for a Linux host, based on the presence of
1385 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
1386 dnl LINUX based on the result.
1387 AC_DEFUN([OVS_CHECK_LINUX_HOST],
1388   [AC_CACHE_CHECK(
1389      [whether __linux__ is defined],
1390      [ovs_cv_linux],
1391      [AC_COMPILE_IFELSE(
1392         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
1393         [ovs_cv_linux=true],
1394         [ovs_cv_linux=false])])
1395    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])