acinclude.m4

   1 # -*- autoconf -*-
   2
   3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 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 "$version" -ge 4; then
 154        if test "$version" = 4 && test "$patchlevel" -le 18; then
 155           : # Linux 4.x
 156        else
 157           AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 4.18.x is not supported (please refer to the FAQ for advice)])
 158        fi
 159     elif test "$version" = 3 && test "$patchlevel" -ge 10; then
 160        : # Linux 3.x
 161     else
 162        AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 3.10 or later is required])
 163     fi
 164     if (test ! -e "$KBUILD"/include/linux/version.h && \
 165         test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
 166        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 167         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 168         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 169     fi
 170     OVS_CHECK_LINUX_COMPAT
 171   fi
 172   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 173 ])
 174
 175 dnl OVS_CHECK_LINUX_TC
 176 dnl
 177 dnl Configure Linux tc compat.
 178 AC_DEFUN([OVS_CHECK_LINUX_TC], [
 179   AC_COMPILE_IFELSE([
 180     AC_LANG_PROGRAM([#include <linux/pkt_cls.h>], [
 181         int x = TCA_FLOWER_KEY_ENC_IP_TTL_MASK;
 182     ])],
 183     [AC_DEFINE([HAVE_TCA_FLOWER_KEY_ENC_IP_TTL_MASK], [1],
 184                [Define to 1 if TCA_FLOWER_KEY_ENC_IP_TTL_MASK is available.])])
 185
 186   AC_COMPILE_IFELSE([
 187     AC_LANG_PROGRAM([#include <linux/tc_act/tc_vlan.h>], [
 188         int x = TCA_VLAN_PUSH_VLAN_PRIORITY;
 189     ])],
 190     [AC_DEFINE([HAVE_TCA_VLAN_PUSH_VLAN_PRIORITY], [1],
 191                [Define to 1 if TCA_VLAN_PUSH_VLAN_PRIORITY is available.])])
 192
 193   AC_COMPILE_IFELSE([
 194     AC_LANG_PROGRAM([#include <linux/tc_act/tc_tunnel_key.h>], [
 195         int x = TCA_TUNNEL_KEY_ENC_TTL;
 196     ])],
 197     [AC_DEFINE([HAVE_TCA_TUNNEL_KEY_ENC_TTL], [1],
 198                [Define to 1 if TCA_TUNNEL_KEY_ENC_TTL is available.])])
 199
 200   AC_COMPILE_IFELSE([
 201     AC_LANG_PROGRAM([#include <linux/tc_act/tc_pedit.h>], [
 202         int x = TCA_PEDIT_KEY_EX_HDR_TYPE_UDP;
 203     ])],
 204     [AC_DEFINE([HAVE_TCA_PEDIT_KEY_EX_HDR_TYPE_UDP], [1],
 205                [Define to 1 if TCA_PEDIT_KEY_EX_HDR_TYPE_UDP is available.])])
 206 ])
 207
 208 dnl OVS_CHECK_DPDK
 209 dnl
 210 dnl Configure DPDK source tree
 211 AC_DEFUN([OVS_CHECK_DPDK], [
 212   AC_ARG_WITH([dpdk],
 213               [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
 214                               [Specify the DPDK build directory])],
 215               [have_dpdk=true])
 216
 217   AC_MSG_CHECKING([whether dpdk datapath is enabled])
 218   if test "$have_dpdk" != true || test "$with_dpdk" = no; then
 219     AC_MSG_RESULT([no])
 220     DPDKLIB_FOUND=false
 221   else
 222     AC_MSG_RESULT([yes])
 223     case "$with_dpdk" in
 224       yes)
 225         DPDK_AUTO_DISCOVER="true"
 226         PKG_CHECK_MODULES_STATIC([DPDK], [libdpdk], [
 227             DPDK_INCLUDE="$DPDK_CFLAGS"
 228             DPDK_LIB="$DPDK_LIBS"], [
 229             DPDK_INCLUDE="-I/usr/local/include/dpdk -I/usr/include/dpdk"
 230             DPDK_LIB="-ldpdk"])
 231         ;;
 232       *)
 233         DPDK_AUTO_DISCOVER="false"
 234         DPDK_INCLUDE_PATH="$with_dpdk/include"
 235         # If 'with_dpdk' is passed install directory, point to headers
 236         # installed in $DESTDIR/$prefix/include/dpdk
 237         if test -e "$DPDK_INCLUDE_PATH/rte_config.h"; then
 238            DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH"
 239         elif test -e "$DPDK_INCLUDE_PATH/dpdk/rte_config.h"; then
 240            DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH/dpdk"
 241         fi
 242         DPDK_LIB_DIR="$with_dpdk/lib"
 243         DPDK_LIB="-ldpdk"
 244         ;;
 245     esac
 246
 247     ovs_save_CFLAGS="$CFLAGS"
 248     ovs_save_LDFLAGS="$LDFLAGS"
 249     CFLAGS="$CFLAGS $DPDK_INCLUDE"
 250     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 251       LDFLAGS="$LDFLAGS -L${DPDK_LIB_DIR}"
 252     fi
 253
 254     AC_CHECK_HEADERS([rte_config.h], [], [
 255       AC_MSG_ERROR([unable to find rte_config.h in $with_dpdk])
 256     ], [AC_INCLUDES_DEFAULT])
 257
 258     AC_COMPILE_IFELSE([
 259       AC_LANG_PROGRAM(
 260         [
 261           #include <rte_config.h>
 262 #if defined(RTE_LIBRTE_VHOST_NUMA) || defined(RTE_EAL_NUMA_AWARE_HUGEPAGES)
 263 #error
 264 #endif
 265         ], [])
 266       ], [],
 267       [AC_SEARCH_LIBS([get_mempolicy],[numa],[],[AC_MSG_ERROR([unable to find libnuma, install the dependency package])])
 268        AC_DEFINE([VHOST_NUMA], [1], [NUMA Aware vHost support detected in DPDK.])])
 269
 270     AC_COMPILE_IFELSE([
 271       AC_LANG_PROGRAM(
 272         [
 273           #include <rte_config.h>
 274 #if RTE_LIBRTE_PMD_PCAP
 275 #error
 276 #endif
 277         ], [])
 278       ], [],
 279       [AC_SEARCH_LIBS([pcap_dump],[pcap],[],[AC_MSG_ERROR([unable to find libpcap, install the dependency package])])
 280        AC_COMPILE_IFELSE([
 281          AC_LANG_PROGRAM(
 282            [
 283              #include <rte_config.h>
 284 #if RTE_LIBRTE_PDUMP
 285 #error
 286 #endif
 287          ], [])
 288        ], [],
 289        [AC_DEFINE([DPDK_PDUMP], [1], [DPDK pdump enabled in OVS.])])
 290      ])
 291
 292     AC_COMPILE_IFELSE([
 293       AC_LANG_PROGRAM(
 294         [
 295           #include <rte_config.h>
 296 #if RTE_LIBRTE_MLX5_PMD
 297 #error
 298 #endif
 299         ], [])
 300       ], [],
 301       [AC_SEARCH_LIBS([mnl_attr_put],[mnl],[],[AC_MSG_ERROR([unable to find libmnl, install the dependency package])])])
 302
 303     AC_COMPILE_IFELSE([
 304       AC_LANG_PROGRAM(
 305         [
 306           #include <rte_config.h>
 307 #if defined(RTE_LIBRTE_MLX5_PMD) && !defined(RTE_LIBRTE_MLX5_DLOPEN_DEPS)
 308 #error
 309 #endif
 310         ], [])
 311       ], [],
 312       [AC_SEARCH_LIBS([mlx5dv_create_wq],[mlx5],[],[AC_MSG_ERROR([unable to find libmlx5, install the dependency package])])])
 313
 314     AC_COMPILE_IFELSE([
 315       AC_LANG_PROGRAM(
 316         [
 317           #include <rte_config.h>
 318 #if defined(RTE_LIBRTE_MLX4_PMD) && !defined(RTE_LIBRTE_MLX4_DLOPEN_DEPS)
 319 #error
 320 #endif
 321         ], [])
 322       ], [],
 323       [AC_SEARCH_LIBS([mlx4dv_init_obj],[mlx4],[],[AC_MSG_ERROR([unable to find libmlx4, install the dependency package])])])
 324
 325     AC_COMPILE_IFELSE([
 326       AC_LANG_PROGRAM(
 327         [
 328           #include <rte_config.h>
 329 #if defined(RTE_LIBRTE_MLX5_PMD) && !defined(RTE_LIBRTE_MLX5_DLOPEN_DEPS)
 330 #error
 331 #endif
 332 #if defined(RTE_LIBRTE_MLX4_PMD) && !defined(RTE_LIBRTE_MLX4_DLOPEN_DEPS)
 333 #error
 334 #endif
 335         ], [])
 336       ], [],
 337       [AC_SEARCH_LIBS([verbs_init_cq],[ibverbs],[],[AC_MSG_ERROR([unable to find libibverbs, install the dependency package])])])
 338
 339     # On some systems we have to add -ldl to link with dpdk
 340     #
 341     # This code, at first, tries to link without -ldl (""),
 342     # then adds it and tries again.
 343     # Before each attempt the search cache must be unset,
 344     # otherwise autoconf will stick with the old result
 345
 346     DPDKLIB_FOUND=false
 347     save_LIBS=$LIBS
 348     for extras in "" "-ldl"; do
 349         LIBS="$DPDK_LIB $extras $save_LIBS"
 350         AC_LINK_IFELSE(
 351            [AC_LANG_PROGRAM([#include <rte_config.h>
 352                              #include <rte_eal.h>],
 353                             [int rte_argc; char ** rte_argv;
 354                              rte_eal_init(rte_argc, rte_argv);])],
 355            [DPDKLIB_FOUND=true])
 356         if $DPDKLIB_FOUND; then
 357             break
 358         fi
 359     done
 360
 361     # If linking unsuccessful
 362     if test "$DPDKLIB_FOUND" = "false" ; then
 363       if $DPDK_AUTO_DISCOVER; then
 364         AC_MSG_ERROR([Could not find DPDK library in default search path, Use --with-dpdk to specify the DPDK library installed in non-standard location])
 365       else
 366         AC_MSG_ERROR([Could not find DPDK libraries in $DPDK_LIB_DIR])
 367       fi
 368     fi
 369     CFLAGS="$ovs_save_CFLAGS"
 370     LDFLAGS="$ovs_save_LDFLAGS"
 371     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 372       OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
 373     fi
 374     OVS_CFLAGS="$OVS_CFLAGS $DPDK_INCLUDE"
 375     OVS_ENABLE_OPTION([-mssse3])
 376
 377     # DPDK pmd drivers are not linked unless --whole-archive is used.
 378     #
 379     # This happens because the rest of the DPDK code doesn't use any symbol in
 380     # the pmd driver objects, and the drivers register themselves using an
 381     # __attribute__((constructor)) function.
 382     #
 383     # These options are specified inside a single -Wl directive to prevent
 384     # autotools from reordering them.
 385     #
 386     # OTOH newer versions of dpdk pkg-config (generated with Meson)
 387     # will already have flagged just the right set of libs with
 388     # --whole-archive - in those cases do not wrap it once more.
 389     case "$DPDK_LIB" in
 390       *whole-archive*) DPDK_vswitchd_LDFLAGS=$DPDK_LIB;;
 391       *) DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
 392     esac
 393     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 394     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 395   fi
 396
 397   AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
 398 ])
 399
 400 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 401 dnl
 402 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 403 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 404 dnl <REGEX> translated to uppercase.
 405 AC_DEFUN([OVS_GREP_IFELSE], [
 406   AC_MSG_CHECKING([whether $2 matches in $1])
 407   if test -f $1; then
 408     grep '$2' $1 >/dev/null 2>&1
 409     status=$?
 410     case $status in
 411       0)
 412         AC_MSG_RESULT([yes])
 413         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 414         ;;
 415       1)
 416         AC_MSG_RESULT([no])
 417         $4
 418         ;;
 419       *)
 420         AC_MSG_ERROR([grep exited with status $status])
 421         ;;
 422     esac
 423   else
 424     AC_MSG_RESULT([file not found])
 425     $4
 426   fi
 427 ])
 428
 429 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 430 dnl
 431 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
 432 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
 433 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 434 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
 435 dnl translated to uppercase.
 436 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
 437   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 438   if test -f $1; then
 439     awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
 440     status=$?
 441     case $status in
 442       0)
 443         AC_MSG_RESULT([yes])
 444         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 445         ;;
 446       1)
 447         AC_MSG_RESULT([no])
 448         $5
 449         ;;
 450       *)
 451         AC_MSG_ERROR([grep exited with status $status])
 452         ;;
 453     esac
 454   else
 455     AC_MSG_RESULT([file not found])
 456     $5
 457   fi
 458 ])
 459
 460 dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
 461 dnl
 462 dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
 463 dnl the function signature starting from the line matching FUNCTION
 464 dnl and ending with the line containing the closing parenthesis.  If
 465 dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH.  If
 466 dnl IF-MATCH is empty then it defines to
 467 dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
 468 dnl <REGEX> translated to uppercase.
 469 AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
 470   AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
 471   if test -f $1; then
 472     awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
 473     status=$?
 474     case $status in
 475       0)
 476         AC_MSG_RESULT([yes])
 477         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 478         ;;
 479       1)
 480         AC_MSG_RESULT([no])
 481         $5
 482         ;;
 483       *)
 484         AC_MSG_ERROR([grep exited with status $status])
 485         ;;
 486     esac
 487   else
 488     AC_MSG_RESULT([file not found])
 489     $5
 490   fi
 491 ])
 492
 493 dnl OVS_DEFINE(NAME)
 494 dnl
 495 dnl Defines NAME to 1 in kcompat.h.
 496 AC_DEFUN([OVS_DEFINE], [
 497   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 498 ])
 499
 500 dnl OVS_CHECK_LINUX_COMPAT
 501 dnl
 502 dnl Runs various Autoconf checks on the Linux kernel source in
 503 dnl the directory in $KBUILD.
 504 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 505   rm -f datapath/linux/kcompat.h.new
 506   mkdir -p datapath/linux
 507   : > datapath/linux/kcompat.h.new
 508
 509   echo '#include <linux/version.h>
 510 #ifndef RHEL_RELEASE_CODE
 511 #define RHEL_RELEASE_CODE 0
 512 #define RHEL_RELEASE_VERSION(a, b) 0
 513 #endif' >> datapath/linux/kcompat.h.new
 514
 515   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 516                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 517
 518   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6_get_cookie],
 519                   [OVS_DEFINE([HAVE_RT6_GET_COOKIE])])
 520
 521   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
 522                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
 523   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
 524
 525   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 526   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 527   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
 528
 529   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [static_branch_unlikely(],
 530                   [OVS_DEFINE([HAVE_UPSTREAM_STATIC_KEY])])
 531   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [DEFINE_STATIC_KEY_FALSE],
 532                   [OVS_DEFINE([HAVE_DEFINE_STATIC_KEY])])
 533
 534   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 535   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 536
 537   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
 538   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
 539   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 540   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 541   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 542
 543   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 544   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
 545   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 546                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 547   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
 548                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
 549
 550   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
 551                   [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
 552   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
 553                   [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
 554   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 555                         [ip_do_fragment], [net],
 556                         [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
 557   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 558                         [ip_local_out], [net],
 559                         [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
 560
 561   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 562
 563   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
 564                   [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
 565   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
 566   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
 567                   [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
 568   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
 569                   [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
 570   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
 571   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
 572   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 573                         [frags_work])
 574   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 575                         [rwlock])
 576   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
 577                         [list_evictor])
 578   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
 579   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
 580                         [sub_frag_mem_limit], [struct.netns_frags],
 581                         [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
 582   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
 583                   [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
 584   OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
 585                   [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
 586
 587   dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
 588   dnl OVS does not really need ipv6 label field, but its presence signifies that
 589   dnl the stack has all required ipv6 support.
 590   dnl OVS also does not need dst_cache But this dependency allows us to write
 591   dnl much cleaner code.
 592
 593   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
 594                         [label],
 595                         [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
 596                                          [iptunnel_pull_offloads],
 597                         [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 598                         [OVS_GREP_IFELSE([$KSRC/include/net/erspan.h], [erspan_md2],
 599                                          [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])])
 600
 601   OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 602                   [OVS_DEFINE([USE_BUILTIN_DST_CACHE])])
 603   OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
 604                   [OVS_DEFINE([MPLS_HEADER_IS_L3])])
 605   OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
 606                   [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
 607   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
 608   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 609   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 610   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 611   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
 612   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 613   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_gso_error_unwind])
 614   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 615   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
 616   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
 617                   [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
 618   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
 619   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
 620   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_udp_tunnel_add])
 621   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 622   dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
 623   dnl So check type of tstats.
 624   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
 625                   [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
 626   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
 627                   [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
 628   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_csum_hwoffload_help])
 629   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
 630   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
 631                   [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
 632   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
 633   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
 634   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 635                         [extended])
 636   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 637                         [netdev_master_upper_dev_link], [upper_priv],
 638                         [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
 639   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 640                   [netdev_master_upper_dev_link_rh],
 641                   [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_RH])])
 642
 643   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 644                         [max_mtu])
 645   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops_extended],
 646                         [ndo_change_mtu], [OVS_DEFINE([HAVE_RHEL7_MAX_MTU])])
 647
 648   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
 649   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
 650   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
 651                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
 652   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
 653                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
 654   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 655                         [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
 656   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [NFPROTO_INET])
 657
 658
 659   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
 660                         [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 661
 662   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 663                         [nf_conn], [struct timer_list[[ \t]]*timeout],
 664                         [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
 665   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 666                   [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
 667
 668   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 669                   [nf_ct_tmpl_alloc], [nf_conntrack_zone],
 670                   [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
 671   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 672                   [nf_ct_get_tuplepr], [struct.net],
 673                   [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
 674   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 675                   [nf_ct_set])
 676   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 677                   [nf_ct_is_untracked])
 678   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
 679                   [nf_ct_zone_init])
 680   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
 681                   [net_ns_get])
 682   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 683                   [nf_connlabels_get])
 684   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 685                   [nf_connlabels_get], [int bit],
 686                   [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
 687   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 688                         [nf_conn_labels], [words])
 689   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
 690   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
 691   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_range2])
 692   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
 693   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h], [nf_conncount_gc_list],
 694                   [OVS_DEFINE([HAVE_UPSTREAM_NF_CONNCOUNT])])
 695
 696   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
 697   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
 698
 699   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
 700   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
 701   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
 702                   [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
 703   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
 704
 705   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 706                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 707                                    [rcu_read_lock_held])])
 708   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 709   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [net_rwsem])
 710
 711   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 712   # is necessary because some versions of this header remove the
 713   # member but retain the kerneldoc comment that describes it (which
 714   # starts with @).  The brackets must be doubled because of m4
 715   # quoting rules.
 716   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 717                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 718   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
 719   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
 720   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
 721   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
 722   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
 723   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 724   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 725                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 726   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 727                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 728   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 729                   [skb_copy_from_linear_data_offset])
 730   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 731                   [skb_reset_tail_pointer])
 732   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 733   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 734                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 735   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 736   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 737   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 738   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 739   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 740   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 741   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 742   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
 743                   [OVS_DEFINE([HAVE_SKB_GET_HASH])])
 744   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 745   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 746                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 747   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
 748                   [OVS_DEFINE([HAVE_L4_RXHASH])])
 749   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 750   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 751   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
 752   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 753   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
 754   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
 755   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
 756   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
 757   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_put_zero])
 758
 759   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 760                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 761   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 762                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 763   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 764                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 765
 766   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 767   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 768
 769   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
 770   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
 771
 772   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 773   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 774   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 775   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 776                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 777   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 778   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
 779                   [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
 780   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
 781                         [genl_notify], [net],
 782                         [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
 783
 784
 785   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
 786                         [genl_multicast_group], [id])
 787   OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
 788
 789   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 790   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 791   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 792   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
 793   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
 794   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
 795                   [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
 796   OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
 797                   [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
 798
 799   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
 800   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 801   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 802   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 803   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 804   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
 805   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 806   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 807   OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
 808                   [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
 809   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
 810                         [nla_parse], [netlink_ext_ack],
 811                         [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
 812
 813   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 814
 815   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 816                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 817   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 818   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 819   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
 820   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
 821   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
 822
 823   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/dst_metadata.h],
 824                         [metadata_dst_alloc], [metadata_type])
 825
 826   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 827
 828   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 829                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 830   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 831                   [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
 832                                    [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
 833   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
 834   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
 835   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
 836                   [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
 837   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
 838                         [gro_receive])
 839
 840   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
 841                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 842   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 843                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 844
 845   OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
 846   OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
 847   OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
 848                   [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
 849   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
 850                         [udp_add_offload], [net],
 851                         [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
 852   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 853                         [nf_defrag_ipv6_enable], [net],
 854                         [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
 855   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [family_list],
 856                         [OVS_DEFINE([HAVE_GENL_FAMILY_LIST])])
 857   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 858                         [needs_free_netdev],
 859                         [OVS_DEFINE([HAVE_NEEDS_FREE_NETDEV])])
 860   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_dev], [cfg],
 861                         [OVS_DEFINE([HAVE_VXLAN_DEV_CFG])])
 862   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
 863                   [nf_conntrack_helper_put],
 864                   [OVS_DEFINE(HAVE_NF_CONNTRACK_HELPER_PUT)])
 865   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],[[[[:space:]]]SKB_GSO_UDP[[[:space:]]]],
 866                   [OVS_DEFINE([HAVE_SKB_GSO_UDP])])
 867   OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
 868                   [OVS_DEFINE([HAVE_DST_NOCACHE])])
 869   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
 870                         [extack],
 871                   [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
 872   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 873                         [list],
 874                         [OVS_DEFINE([HAVE_LIST_IN_NF_HOOK_OPS])])
 875   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netfilter/nf_conntrack_common.h],
 876                   [IP_CT_UNTRACKED])
 877   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 878                         [netdev_master_upper_dev_link], [extack],
 879                         [OVS_DEFINE([HAVE_UPPER_DEV_LINK_EXTACK])])
 880   OVS_GREP_IFELSE([$KSRC/include/linux/compiler_types.h],
 881                   [__LINUX_COMPILER_TYPES_H],
 882                   [OVS_DEFINE([HAVE_LINUX_COMPILER_TYPES_H])])
 883   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 884                   [ktime_get_ts64],
 885                   [OVS_DEFINE([HAVE_KTIME_GET_TS64])])
 886   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h],
 887                   [EXPORT_SYMBOL_GPL(peernet2id_alloc)],
 888                   [OVS_DEFINE([HAVE_PEERNET2ID_ALLOC])])
 889   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 890                   [ktime_get_ns],
 891                   [OVS_DEFINE([HAVE_KTIME_GET_NS])])
 892   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h],
 893                   frag_percpu_counter_batch[],
 894                   [OVS_DEFINE([HAVE_FRAG_PERCPU_COUNTER_BATCH])])
 895   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 896                   [null_compute_pseudo],
 897                   [OVS_DEFINE([HAVE_NULL_COMPUTE_PSEUDO])])
 898   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 899                   [__skb_checksum_convert],
 900                   [OVS_DEFINE([HAVE_SKB_CHECKSUM_CONVERT])])
 901   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 902                         [max_mtu],
 903                         [OVS_DEFINE([HAVE_NET_DEVICE_MAX_MTU])])
 904   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip6_tunnel.h], [__ip6_tnl_parm],
 905                         [erspan_ver],
 906                         [OVS_DEFINE([HAVE_IP6_TNL_PARM_ERSPAN_VER])])
 907   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 908                   [SKB_GSO_IPXIP6],
 909                   [OVS_DEFINE([HAVE_SKB_GSO_IPXIP6])])
 910   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ipv6.h],
 911                         [ip6_make_flowlabel], [fl6],
 912                         [OVS_DEFINE([HAVE_IP6_MAKE_FLOWLABEL_FL6])])
 913   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ipv6.h], [netns_sysctl_ipv6],
 914                         [auto_flowlabels],
 915                         [OVS_DEFINE([HAVE_NETNS_SYSCTL_IPV6_AUTO_FLOWLABELS])])
 916   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 917                   [netif_keep_dst],
 918                   [OVS_DEFINE([HAVE_NETIF_KEEP_DST])])
 919   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 920                         [ndo_get_iflink],
 921                         [OVS_DEFINE([HAVE_NDO_GET_IFLINK])])
 922   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 923                   [skb_set_inner_ipproto],
 924                   [OVS_DEFINE([HAVE_SKB_SET_INNER_IPPROTO])])
 925   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 926                   [tunnel_encap_types],
 927                   [OVS_DEFINE([HAVE_TUNNEL_ENCAP_TYPES])])
 928   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 929                   [IFLA_IPTUN_ENCAP_TYPE],
 930                   [OVS_DEFINE([HAVE_IFLA_IPTUN_ENCAP_TYPE])])
 931   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 932                   [IFLA_IPTUN_COLLECT_METADATA],
 933                   [OVS_DEFINE([HAVE_IFLA_IPTUN_COLLECT_METADATA])])
 934   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 935                   [IFLA_GRE_ENCAP_DPORT])
 936   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 937                   [IFLA_GRE_COLLECT_METADATA])
 938   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 939                   [IFLA_GRE_IGNORE_DF])
 940   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 941                   [IFLA_GRE_FWMARK])
 942   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 943                   [IFLA_GRE_ERSPAN_INDEX])
 944   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 945                   [IFLA_GRE_ERSPAN_HWID])
 946   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 947                   [IFLA_IPTUN_FWMARK])
 948   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
 949                         [csum_valid],
 950                         [OVS_DEFINE([HAVE_SKBUFF_CSUM_VALID])])
 951   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 952                   [skb_checksum_simple_validate])
 953   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 954                   [void.*ndo_get_stats64],
 955                   [OVS_DEFINE([HAVE_VOID_NDO_GET_STATS64])])
 956   OVS_GREP_IFELSE([$KSRC/include/linux/timer.h], [init_timer_deferrable],
 957                   [OVS_DEFINE([HAVE_INIT_TIMER_DEFERRABLE])])
 958   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip_tunnels.h],
 959                         [ip_tunnel_info_opts_set], [flags],
 960                         [OVS_DEFINE([HAVE_IP_TUNNEL_INFO_OPTS_SET_FLAGS])])
 961   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 962                         [rnd],
 963                         [OVS_DEFINE([HAVE_INET_FRAGS_RND])])
 964
 965   if cmp -s datapath/linux/kcompat.h.new \
 966             datapath/linux/kcompat.h >/dev/null 2>&1; then
 967     rm datapath/linux/kcompat.h.new
 968   else
 969     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 970   fi
 971 ])
 972
 973 dnl Checks for net/if_dl.h.
 974 dnl
 975 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 976 dnl or NetBSD.)
 977 AC_DEFUN([OVS_CHECK_IF_DL],
 978   [AC_CHECK_HEADER([net/if_dl.h],
 979                    [HAVE_IF_DL=yes],
 980                    [HAVE_IF_DL=no])
 981    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 982    if test "$HAVE_IF_DL" = yes; then
 983       AC_DEFINE([HAVE_IF_DL], [1],
 984                 [Define to 1 if net/if_dl.h is available.])
 985
 986       # On these platforms we use libpcap to access network devices.
 987       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 988    fi])
 989
 990 dnl Checks for buggy strtok_r.
 991 dnl
 992 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 993 dnl with optimization that can cause segfaults:
 994 dnl
 995 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 996 AC_DEFUN([OVS_CHECK_STRTOK_R],
 997   [AC_CACHE_CHECK(
 998      [whether strtok_r macro segfaults on some inputs],
 999      [ovs_cv_strtok_r_bug],
1000      [AC_RUN_IFELSE(
1001         [AC_LANG_PROGRAM([#include <stdio.h>
1002                           #include <string.h>
1003                          ],
1004                          [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
1005                            /* Assume bug is present, because relatively minor
1006                               changes in compiler settings (e.g. optimization
1007                               level) can make it crop up. */
1008                            return 1;
1009                            #else
1010                            char string[] = ":::";
1011                            char *save_ptr = (char *) 0xc0ffee;
1012                            char *token1, *token2;
1013                            token1 = strtok_r(string, ":", &save_ptr);
1014                            token2 = strtok_r(NULL, ":", &save_ptr);
1015                            freopen ("/dev/null", "w", stdout);
1016                            printf ("%s %s\n", token1, token2);
1017                            return 0;
1018                            #endif
1019                           ]])],
1020         [ovs_cv_strtok_r_bug=no],
1021         [ovs_cv_strtok_r_bug=yes],
1022         [ovs_cv_strtok_r_bug=yes])])
1023    if test $ovs_cv_strtok_r_bug = yes; then
1024      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
1025                [Define if strtok_r macro segfaults on some inputs])
1026    fi
1027 ])
1028
1029 dnl ----------------------------------------------------------------------
1030 dnl These macros are from GNU PSPP, with the following original license:
1031 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
1032 dnl This file is free software; the Free Software Foundation
1033 dnl gives unlimited permission to copy and/or distribute it,
1034 dnl with or without modifications, as long as this notice is preserved.
1035
1036 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
1037   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-= ], [__])])dnl
1038   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
1039     [ovs_save_CFLAGS="$CFLAGS"
1040      dnl Include -Werror in the compiler options, because without -Werror
1041      dnl clang's GCC-compatible compiler driver does not return a failure
1042      dnl exit status even though it complains about options it does not
1043      dnl understand.
1044      dnl
1045      dnl Also, check stderr as gcc exits with status 0 for options
1046      dnl rejected at getopt level.
1047      dnl    % touch /tmp/a.c
1048      dnl    % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
1049      dnl    gcc: unrecognized option '-Qunused-arguments'
1050      dnl    0
1051      dnl    %
1052      dnl
1053      dnl In addition, GCC does not complain about a -Wno-<foo> option that
1054      dnl it does not understand, unless it has another error to report, so
1055      dnl instead of testing for -Wno-<foo>, test for the positive version.
1056      CFLAGS="$CFLAGS $WERROR m4_bpatsubst([$1], [-Wno-], [-W])"
1057      AC_COMPILE_IFELSE(
1058        [AC_LANG_SOURCE([int x;])],
1059        [if test -s conftest.err && grep "unrecognized option" conftest.err
1060         then
1061           ovs_cv_name[]=no
1062         else
1063           ovs_cv_name[]=yes
1064         fi],
1065        [ovs_cv_name[]=no])
1066      CFLAGS="$ovs_save_CFLAGS"])
1067   if test $ovs_cv_name = yes; then
1068     m4_if([$2], [], [:], [$2])
1069   else
1070     m4_if([$3], [], [:], [$3])
1071   fi
1072 ])
1073
1074 dnl OVS_CHECK_WERROR
1075 dnl
1076 dnl Check whether the C compiler accepts -Werror.
1077 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
1078 AC_DEFUN([OVS_CHECK_WERROR],
1079   [WERROR=
1080    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
1081
1082 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
1083 dnl Check whether the given C compiler OPTION is accepted.
1084 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
1085 AC_DEFUN([OVS_CHECK_CC_OPTION],
1086   [AC_REQUIRE([OVS_CHECK_WERROR])
1087    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
1088
1089 dnl OVS_ENABLE_OPTION([OPTION])
1090 dnl Check whether the given C compiler OPTION is accepted.
1091 dnl If so, add it to WARNING_FLAGS.
1092 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
1093 AC_DEFUN([OVS_ENABLE_OPTION],
1094   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
1095    AC_SUBST([WARNING_FLAGS])])
1096
1097 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
1098 dnl Check whether the given C compiler OPTION is accepted.
1099 dnl If so, enable the given Automake CONDITIONAL.
1100
1101 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
1102 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
1103   [OVS_CHECK_CC_OPTION(
1104     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
1105    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
1106 dnl ----------------------------------------------------------------------
1107
1108 dnl Check for too-old XenServer.
1109 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
1110   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
1111     [if test -e /etc/redhat-release; then
1112        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
1113      fi
1114      if test -z "$ovs_cv_xsversion"; then
1115        ovs_cv_xsversion=none
1116      fi])
1117   case $ovs_cv_xsversion in
1118     none)
1119       ;;
1120
1121     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
1122     [[6-9]]* |                           dnl XenServer 6 or later
1123     5.[[7-9]]* |                         dnl XenServer 5.7 or later
1124     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
1125     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
1126     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
1127       ;;
1128
1129     *)
1130       AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported.  (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
1131       ;;
1132   esac])
1133
1134 dnl OVS_CHECK_SPARSE_TARGET
1135 dnl
1136 dnl The "cgcc" script from "sparse" isn't very good at detecting the
1137 dnl target for which the code is being built.  This helps it out.
1138 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
1139   [AC_CACHE_CHECK(
1140     [target hint for cgcc],
1141     [ac_cv_sparse_target],
1142     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
1143        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
1144        [x86_64-*], [ac_cv_sparse_target=x86_64],
1145        [ac_cv_sparse_target=other])])
1146    AS_CASE([$ac_cv_sparse_target],
1147      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
1148      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
1149      [SPARSEFLAGS= CGCCFLAGS=])
1150    AC_SUBST([SPARSEFLAGS])
1151    AC_SUBST([CGCCFLAGS])])
1152
1153 dnl OVS_SPARSE_EXTRA_INCLUDES
1154 dnl
1155 dnl The cgcc script from "sparse" does not search gcc's default
1156 dnl search path. Get the default search path from GCC and pass
1157 dnl them to sparse.
1158 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
1159     AC_SUBST([SPARSE_EXTRA_INCLUDES],
1160            [`$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 ' ' `] ))
1161
1162 dnl OVS_ENABLE_SPARSE
1163 AC_DEFUN([OVS_ENABLE_SPARSE],
1164   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
1165    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
1166    : ${SPARSE=sparse}
1167    AC_SUBST([SPARSE])
1168    AC_CONFIG_COMMANDS_PRE(
1169      [CC='$(if $(C:0=),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) $(SPARSE_WERROR) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'])
1170
1171    AC_ARG_ENABLE(
1172      [sparse],
1173      [AC_HELP_STRING([--enable-sparse], [Run "sparse" by default])],
1174      [], [enable_sparse=no])
1175    AM_CONDITIONAL([ENABLE_SPARSE_BY_DEFAULT], [test $enable_sparse = yes])])
1176
1177 dnl OVS_CTAGS_IDENTIFIERS
1178 dnl
1179 dnl ctags ignores symbols with extras identifiers. This builds a list of
1180 dnl specially handled identifiers to be ignored.
1181 AC_DEFUN([OVS_CTAGS_IDENTIFIERS],
1182     AC_SUBST([OVS_CTAGS_IDENTIFIERS_LIST],
1183            [`printf %s '-I "'; sed -n 's/^#define \(OVS_[A-Z_]\+\)(\.\.\.)$/\1+/p' ${srcdir}/include/openvswitch/compiler.h  | tr \\\n ' ' ; printf '"'`] ))
1184
1185 dnl OVS_PTHREAD_SET_NAME
1186 dnl
1187 dnl This checks for three known variants of pthreads functions for setting
1188 dnl the name of the current thread:
1189 dnl
1190 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
1191 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
1192 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
1193 dnl
1194 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
1195 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
1196 dnl provide to it.
1197 dnl
1198 dnl This macro defines:
1199 dnl
1200 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
1201 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
1202 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
1203 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
1204   [AC_CHECK_FUNCS([pthread_set_name_np])
1205    if test $ac_cv_func_pthread_set_name_np != yes; then
1206      AC_CACHE_CHECK(
1207        [for pthread_setname_np() variant],
1208        [ovs_cv_pthread_setname_np],
1209        [AC_LINK_IFELSE(
1210          [AC_LANG_PROGRAM([#include <pthread.h>
1211   ], [pthread_setname_np(pthread_self(), "name");])],
1212          [ovs_cv_pthread_setname_np=glibc],
1213          [AC_LINK_IFELSE(
1214            [AC_LANG_PROGRAM([#include <pthread.h>
1215 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
1216            [ovs_cv_pthread_setname_np=netbsd],
1217            [ovs_cv_pthread_setname_np=none])])])
1218      case $ovs_cv_pthread_setname_np in # (
1219        glibc)
1220           AC_DEFINE(
1221             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
1222             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
1223           ;; # (
1224        netbsd)
1225           AC_DEFINE(
1226             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
1227             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
1228           ;;
1229      esac
1230    fi])
1231
1232 dnl OVS_CHECK_LINUX_HOST.
1233 dnl
1234 dnl Checks whether we're building for a Linux host, based on the presence of
1235 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
1236 dnl LINUX based on the result.
1237 AC_DEFUN([OVS_CHECK_LINUX_HOST],
1238   [AC_CACHE_CHECK(
1239      [whether __linux__ is defined],
1240      [ovs_cv_linux],
1241      [AC_COMPILE_IFELSE(
1242         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
1243         [ovs_cv_linux=true],
1244         [ovs_cv_linux=false])])
1245    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])