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 "$with_dpdk" in
 224       yes)
 225         DPDK_AUTO_DISCOVER="true"
 226         PKG_CHECK_MODULES([DPDK], [libdpdk],
 227                           [DPDK_INCLUDE="$DPDK_CFLAGS"],
 228                           [DPDK_INCLUDE="-I/usr/local/include/dpdk -I/usr/include/dpdk"])
 229         ;;
 230       *)
 231         DPDK_AUTO_DISCOVER="false"
 232         DPDK_INCLUDE_PATH="$with_dpdk/include"
 233         # If 'with_dpdk' is passed install directory, point to headers
 234         # installed in $DESTDIR/$prefix/include/dpdk
 235         if test -e "$DPDK_INCLUDE_PATH/rte_config.h"; then
 236            DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH"
 237         elif test -e "$DPDK_INCLUDE_PATH/dpdk/rte_config.h"; then
 238            DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH/dpdk"
 239         fi
 240         DPDK_LIB_DIR="$with_dpdk/lib"
 241         ;;
 242     esac
 243
 244     DPDK_LIB="-ldpdk"
 245
 246     ovs_save_CFLAGS="$CFLAGS"
 247     ovs_save_LDFLAGS="$LDFLAGS"
 248     CFLAGS="$CFLAGS $DPDK_INCLUDE"
 249     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 250       LDFLAGS="$LDFLAGS -L${DPDK_LIB_DIR}"
 251     fi
 252
 253     AC_COMPILE_IFELSE([
 254       AC_LANG_PROGRAM(
 255         [
 256           #include <rte_config.h>
 257 #if defined(RTE_LIBRTE_VHOST_NUMA) || defined(RTE_EAL_NUMA_AWARE_HUGEPAGES)
 258 #error
 259 #endif
 260         ], [])
 261       ], [],
 262       [AC_SEARCH_LIBS([get_mempolicy],[numa],[],[AC_MSG_ERROR([unable to find libnuma, install the dependency package])])
 263        AC_DEFINE([VHOST_NUMA], [1], [NUMA Aware vHost support detected in DPDK.])])
 264
 265     AC_COMPILE_IFELSE([
 266       AC_LANG_PROGRAM(
 267         [
 268           #include <rte_config.h>
 269 #if RTE_LIBRTE_PMD_PCAP
 270 #error
 271 #endif
 272         ], [])
 273       ], [],
 274       [AC_SEARCH_LIBS([pcap_dump],[pcap],[],[AC_MSG_ERROR([unable to find libpcap, install the dependency package])])
 275        AC_COMPILE_IFELSE([
 276          AC_LANG_PROGRAM(
 277            [
 278              #include <rte_config.h>
 279 #if RTE_LIBRTE_PDUMP
 280 #error
 281 #endif
 282          ], [])
 283        ], [],
 284        [AC_DEFINE([DPDK_PDUMP], [1], [DPDK pdump enabled in OVS.])])
 285      ])
 286
 287     AC_COMPILE_IFELSE([
 288       AC_LANG_PROGRAM(
 289         [
 290           #include <rte_config.h>
 291 #if RTE_LIBRTE_MLX5_PMD
 292 #error
 293 #endif
 294         ], [])
 295       ], [],
 296       [AC_SEARCH_LIBS([mnl_attr_put],[mnl],[],[AC_MSG_ERROR([unable to find libmnl, install the dependency package])])
 297        AC_DEFINE([DPDK_MNL], [1], [MLX5 PMD detected in DPDK.])])
 298
 299     AC_COMPILE_IFELSE([
 300       AC_LANG_PROGRAM(
 301         [
 302           #include <rte_config.h>
 303 #if defined(RTE_LIBRTE_MLX5_PMD) && !defined(RTE_LIBRTE_MLX5_DLOPEN_DEPS)
 304 #error
 305 #endif
 306         ], [])
 307       ], [],
 308       [AC_SEARCH_LIBS([mlx5dv_create_wq],[mlx5],[],[AC_MSG_ERROR([unable to find libmlx5, install the dependency package])])])
 309
 310     AC_COMPILE_IFELSE([
 311       AC_LANG_PROGRAM(
 312         [
 313           #include <rte_config.h>
 314 #if defined(RTE_LIBRTE_MLX5_PMD) && !defined(RTE_LIBRTE_MLX5_DLOPEN_DEPS)
 315 #error
 316 #endif
 317         ], [])
 318       ], [],
 319       [AC_SEARCH_LIBS([verbs_init_cq],[ibverbs],[],[AC_MSG_ERROR([unable to find libibverbs, install the dependency package])])])
 320
 321     # On some systems we have to add -ldl to link with dpdk
 322     #
 323     # This code, at first, tries to link without -ldl (""),
 324     # then adds it and tries again.
 325     # Before each attempt the search cache must be unset,
 326     # otherwise autoconf will stick with the old result
 327
 328     DPDKLIB_FOUND=false
 329     save_LIBS=$LIBS
 330     for extras in "" "-ldl"; do
 331         LIBS="$DPDK_LIB $extras $save_LIBS"
 332         AC_LINK_IFELSE(
 333            [AC_LANG_PROGRAM([#include <rte_config.h>
 334                              #include <rte_eal.h>],
 335                             [int rte_argc; char ** rte_argv;
 336                              rte_eal_init(rte_argc, rte_argv);])],
 337            [DPDKLIB_FOUND=true])
 338         if $DPDKLIB_FOUND; then
 339             break
 340         fi
 341     done
 342
 343     # If linking unsuccessful
 344     if test "$DPDKLIB_FOUND" = "false" ; then
 345       if $DPDK_AUTO_DISCOVER; then
 346         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])
 347       else
 348         AC_MSG_ERROR([Could not find DPDK libraries in $DPDK_LIB_DIR])
 349       fi
 350     fi
 351     CFLAGS="$ovs_save_CFLAGS"
 352     LDFLAGS="$ovs_save_LDFLAGS"
 353     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 354       OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
 355     fi
 356     OVS_CFLAGS="$OVS_CFLAGS $DPDK_INCLUDE"
 357     OVS_ENABLE_OPTION([-mssse3])
 358
 359     # DPDK pmd drivers are not linked unless --whole-archive is used.
 360     #
 361     # This happens because the rest of the DPDK code doesn't use any symbol in
 362     # the pmd driver objects, and the drivers register themselves using an
 363     # __attribute__((constructor)) function.
 364     #
 365     # These options are specified inside a single -Wl directive to prevent
 366     # autotools from reordering them.
 367     DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
 368     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 369     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 370   fi
 371
 372   AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
 373 ])
 374
 375 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 376 dnl
 377 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 378 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 379 dnl <REGEX> translated to uppercase.
 380 AC_DEFUN([OVS_GREP_IFELSE], [
 381   AC_MSG_CHECKING([whether $2 matches in $1])
 382   if test -f $1; then
 383     grep '$2' $1 >/dev/null 2>&1
 384     status=$?
 385     case $status in
 386       0)
 387         AC_MSG_RESULT([yes])
 388         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 389         ;;
 390       1)
 391         AC_MSG_RESULT([no])
 392         $4
 393         ;;
 394       *)
 395         AC_MSG_ERROR([grep exited with status $status])
 396         ;;
 397     esac
 398   else
 399     AC_MSG_RESULT([file not found])
 400     $4
 401   fi
 402 ])
 403
 404 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 405 dnl
 406 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
 407 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
 408 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 409 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
 410 dnl translated to uppercase.
 411 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
 412   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 413   if test -f $1; then
 414     awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
 415     status=$?
 416     case $status in
 417       0)
 418         AC_MSG_RESULT([yes])
 419         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 420         ;;
 421       1)
 422         AC_MSG_RESULT([no])
 423         $5
 424         ;;
 425       *)
 426         AC_MSG_ERROR([grep exited with status $status])
 427         ;;
 428     esac
 429   else
 430     AC_MSG_RESULT([file not found])
 431     $5
 432   fi
 433 ])
 434
 435 dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
 436 dnl
 437 dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
 438 dnl the function signature starting from the line matching FUNCTION
 439 dnl and ending with the line containing the closing parenthesis.  If
 440 dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH.  If
 441 dnl IF-MATCH is empty then it defines to
 442 dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
 443 dnl <REGEX> translated to uppercase.
 444 AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
 445   AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
 446   if test -f $1; then
 447     awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
 448     status=$?
 449     case $status in
 450       0)
 451         AC_MSG_RESULT([yes])
 452         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 453         ;;
 454       1)
 455         AC_MSG_RESULT([no])
 456         $5
 457         ;;
 458       *)
 459         AC_MSG_ERROR([grep exited with status $status])
 460         ;;
 461     esac
 462   else
 463     AC_MSG_RESULT([file not found])
 464     $5
 465   fi
 466 ])
 467
 468 dnl OVS_DEFINE(NAME)
 469 dnl
 470 dnl Defines NAME to 1 in kcompat.h.
 471 AC_DEFUN([OVS_DEFINE], [
 472   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 473 ])
 474
 475 dnl OVS_CHECK_LINUX_COMPAT
 476 dnl
 477 dnl Runs various Autoconf checks on the Linux kernel source in
 478 dnl the directory in $KBUILD.
 479 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 480   rm -f datapath/linux/kcompat.h.new
 481   mkdir -p datapath/linux
 482   : > datapath/linux/kcompat.h.new
 483
 484   echo '#include <linux/version.h>
 485 #ifndef RHEL_RELEASE_CODE
 486 #define RHEL_RELEASE_CODE 0
 487 #define RHEL_RELEASE_VERSION(a, b) 0
 488 #endif' >> datapath/linux/kcompat.h.new
 489
 490   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 491                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 492
 493   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6_get_cookie],
 494                   [OVS_DEFINE([HAVE_RT6_GET_COOKIE])])
 495
 496   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
 497                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
 498   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
 499
 500   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 501   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 502   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
 503
 504   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [static_branch_unlikely(],
 505                   [OVS_DEFINE([HAVE_UPSTREAM_STATIC_KEY])])
 506   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [DEFINE_STATIC_KEY_FALSE],
 507                   [OVS_DEFINE([HAVE_DEFINE_STATIC_KEY])])
 508
 509   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 510   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 511
 512   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
 513   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
 514   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 515   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 516   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 517
 518   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 519   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
 520   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 521                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 522   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
 523                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
 524
 525   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
 526                   [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
 527   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
 528                   [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
 529   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 530                         [ip_do_fragment], [net],
 531                         [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
 532   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 533                         [ip_local_out], [net],
 534                         [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
 535
 536   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 537
 538   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
 539                   [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
 540   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
 541   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
 542                   [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
 543   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
 544                   [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
 545   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
 546   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
 547   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 548                         [frags_work])
 549   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 550                         [rwlock])
 551   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
 552                         [list_evictor])
 553   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
 554   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
 555                         [sub_frag_mem_limit], [struct.netns_frags],
 556                         [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
 557   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
 558                   [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
 559   OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
 560                   [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
 561
 562   dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
 563   dnl OVS does not really need ipv6 label field, but its presence signifies that
 564   dnl the stack has all required ipv6 support.
 565   dnl OVS also does not need dst_cache But this dependency allows us to write
 566   dnl much cleaner code.
 567
 568   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
 569                         [label],
 570                         [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
 571                                          [iptunnel_pull_offloads],
 572                         [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 573                         [OVS_GREP_IFELSE([$KSRC/include/net/erspan.h], [erspan_md2],
 574                                          [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])])
 575
 576   OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 577                   [OVS_DEFINE([USE_BUILTIN_DST_CACHE])])
 578   OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
 579                   [OVS_DEFINE([MPLS_HEADER_IS_L3])])
 580   OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
 581                   [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
 582   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
 583   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 584   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 585   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 586   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
 587   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 588   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_gso_error_unwind])
 589   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 590   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
 591   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
 592                   [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
 593   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
 594   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
 595   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_udp_tunnel_add])
 596   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 597   dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
 598   dnl So check type of tstats.
 599   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
 600                   [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
 601   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
 602                   [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
 603   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_csum_hwoffload_help])
 604   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
 605   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
 606                   [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
 607   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
 608   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
 609   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 610                         [extended])
 611   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 612                         [netdev_master_upper_dev_link], [upper_priv],
 613                         [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
 614   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 615                   [netdev_master_upper_dev_link_rh],
 616                   [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_RH])])
 617
 618   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 619                         [max_mtu])
 620   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops_extended],
 621                         [ndo_change_mtu], [OVS_DEFINE([HAVE_RHEL7_MAX_MTU])])
 622
 623   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
 624   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
 625   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
 626                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
 627   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
 628                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
 629   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 630                         [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
 631   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [NFPROTO_INET])
 632
 633
 634   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
 635                         [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 636
 637   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 638                         [nf_conn], [struct timer_list[[ \t]]*timeout],
 639                         [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
 640   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 641                   [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
 642
 643   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 644                   [nf_ct_tmpl_alloc], [nf_conntrack_zone],
 645                   [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
 646   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 647                   [nf_ct_get_tuplepr], [struct.net],
 648                   [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
 649   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 650                   [nf_ct_set])
 651   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 652                   [nf_ct_is_untracked])
 653   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
 654                   [nf_ct_zone_init])
 655   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
 656                   [net_ns_get])
 657   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 658                   [nf_connlabels_get])
 659   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 660                   [nf_connlabels_get], [int bit],
 661                   [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
 662   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 663                         [nf_conn_labels], [words])
 664   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
 665   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
 666   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_range2])
 667   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
 668   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h], [nf_conncount_gc_list],
 669                   [OVS_DEFINE([HAVE_UPSTREAM_NF_CONNCOUNT])])
 670
 671   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
 672   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
 673
 674   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
 675   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
 676   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
 677                   [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
 678   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
 679
 680   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 681                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 682                                    [rcu_read_lock_held])])
 683   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 684   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [net_rwsem])
 685
 686   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 687   # is necessary because some versions of this header remove the
 688   # member but retain the kerneldoc comment that describes it (which
 689   # starts with @).  The brackets must be doubled because of m4
 690   # quoting rules.
 691   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 692                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 693   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
 694   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
 695   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
 696   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
 697   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
 698   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 699   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 700                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 701   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 702                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 703   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 704                   [skb_copy_from_linear_data_offset])
 705   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 706                   [skb_reset_tail_pointer])
 707   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 708   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 709                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 710   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 711   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 712   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 713   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 714   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 715   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 716   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 717   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
 718                   [OVS_DEFINE([HAVE_SKB_GET_HASH])])
 719   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 720   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 721                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 722   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
 723                   [OVS_DEFINE([HAVE_L4_RXHASH])])
 724   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 725   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 726   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
 727   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 728   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
 729   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
 730   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
 731   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
 732   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_put_zero])
 733
 734   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 735                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 736   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 737                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 738   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 739                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 740
 741   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 742   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 743
 744   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
 745   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
 746
 747   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 748   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 749   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 750   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 751                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 752   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 753   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
 754                   [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
 755   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
 756                         [genl_notify], [net],
 757                         [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
 758
 759
 760   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
 761                         [genl_multicast_group], [id])
 762   OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
 763
 764   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 765   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 766   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 767   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
 768   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
 769   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
 770                   [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
 771   OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
 772                   [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
 773
 774   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
 775   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 776   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 777   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 778   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 779   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
 780   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 781   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 782   OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
 783                   [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
 784   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
 785                         [nla_parse], [netlink_ext_ack],
 786                         [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
 787
 788   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 789
 790   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 791                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 792   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 793   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 794   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
 795   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
 796   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
 797
 798   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/dst_metadata.h],
 799                         [metadata_dst_alloc], [metadata_type])
 800
 801   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 802
 803   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 804                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 805   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 806                   [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
 807                                    [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
 808   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
 809   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
 810   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
 811                   [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
 812   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
 813                         [gro_receive])
 814
 815   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
 816                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 817   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 818                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 819
 820   OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
 821   OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
 822   OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
 823                   [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
 824   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
 825                         [udp_add_offload], [net],
 826                         [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
 827   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 828                         [nf_defrag_ipv6_enable], [net],
 829                         [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
 830   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [family_list],
 831                         [OVS_DEFINE([HAVE_GENL_FAMILY_LIST])])
 832   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 833                         [needs_free_netdev],
 834                         [OVS_DEFINE([HAVE_NEEDS_FREE_NETDEV])])
 835   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_dev], [cfg],
 836                         [OVS_DEFINE([HAVE_VXLAN_DEV_CFG])])
 837   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
 838                   [nf_conntrack_helper_put],
 839                   [OVS_DEFINE(HAVE_NF_CONNTRACK_HELPER_PUT)])
 840   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],[[[[:space:]]]SKB_GSO_UDP[[[:space:]]]],
 841                   [OVS_DEFINE([HAVE_SKB_GSO_UDP])])
 842   OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
 843                   [OVS_DEFINE([HAVE_DST_NOCACHE])])
 844   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
 845                         [extack],
 846                   [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
 847   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 848                         [list],
 849                         [OVS_DEFINE([HAVE_LIST_IN_NF_HOOK_OPS])])
 850   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netfilter/nf_conntrack_common.h],
 851                   [IP_CT_UNTRACKED])
 852   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 853                         [netdev_master_upper_dev_link], [extack],
 854                         [OVS_DEFINE([HAVE_UPPER_DEV_LINK_EXTACK])])
 855   OVS_GREP_IFELSE([$KSRC/include/linux/compiler_types.h],
 856                   [__LINUX_COMPILER_TYPES_H],
 857                   [OVS_DEFINE([HAVE_LINUX_COMPILER_TYPES_H])])
 858   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 859                   [ktime_get_ts64],
 860                   [OVS_DEFINE([HAVE_KTIME_GET_TS64])])
 861   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h],
 862                   [EXPORT_SYMBOL_GPL(peernet2id_alloc)],
 863                   [OVS_DEFINE([HAVE_PEERNET2ID_ALLOC])])
 864   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 865                   [ktime_get_ns],
 866                   [OVS_DEFINE([HAVE_KTIME_GET_NS])])
 867   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h],
 868                   frag_percpu_counter_batch[],
 869                   [OVS_DEFINE([HAVE_FRAG_PERCPU_COUNTER_BATCH])])
 870   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 871                   [null_compute_pseudo],
 872                   [OVS_DEFINE([HAVE_NULL_COMPUTE_PSEUDO])])
 873   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 874                   [__skb_checksum_convert],
 875                   [OVS_DEFINE([HAVE_SKB_CHECKSUM_CONVERT])])
 876   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 877                         [max_mtu],
 878                         [OVS_DEFINE([HAVE_NET_DEVICE_MAX_MTU])])
 879   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip6_tunnel.h], [__ip6_tnl_parm],
 880                         [erspan_ver],
 881                         [OVS_DEFINE([HAVE_IP6_TNL_PARM_ERSPAN_VER])])
 882   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 883                   [SKB_GSO_IPXIP6],
 884                   [OVS_DEFINE([HAVE_SKB_GSO_IPXIP6])])
 885   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ipv6.h],
 886                         [ip6_make_flowlabel], [fl6],
 887                         [OVS_DEFINE([HAVE_IP6_MAKE_FLOWLABEL_FL6])])
 888   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ipv6.h], [netns_sysctl_ipv6],
 889                         [auto_flowlabels],
 890                         [OVS_DEFINE([HAVE_NETNS_SYSCTL_IPV6_AUTO_FLOWLABELS])])
 891   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 892                   [netif_keep_dst],
 893                   [OVS_DEFINE([HAVE_NETIF_KEEP_DST])])
 894   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 895                         [ndo_get_iflink],
 896                         [OVS_DEFINE([HAVE_NDO_GET_IFLINK])])
 897   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 898                   [skb_set_inner_ipproto],
 899                   [OVS_DEFINE([HAVE_SKB_SET_INNER_IPPROTO])])
 900   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 901                   [tunnel_encap_types],
 902                   [OVS_DEFINE([HAVE_TUNNEL_ENCAP_TYPES])])
 903   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 904                   [IFLA_IPTUN_ENCAP_TYPE],
 905                   [OVS_DEFINE([HAVE_IFLA_IPTUN_ENCAP_TYPE])])
 906   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 907                   [IFLA_IPTUN_COLLECT_METADATA],
 908                   [OVS_DEFINE([HAVE_IFLA_IPTUN_COLLECT_METADATA])])
 909   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 910                   [IFLA_GRE_ENCAP_DPORT])
 911   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 912                   [IFLA_GRE_COLLECT_METADATA])
 913   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 914                   [IFLA_GRE_IGNORE_DF])
 915   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 916                   [IFLA_GRE_FWMARK])
 917   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 918                   [IFLA_GRE_ERSPAN_INDEX])
 919   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 920                   [IFLA_GRE_ERSPAN_HWID])
 921   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 922                   [IFLA_IPTUN_FWMARK])
 923   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
 924                         [csum_valid],
 925                         [OVS_DEFINE([HAVE_SKBUFF_CSUM_VALID])])
 926   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 927                   [skb_checksum_simple_validate])
 928   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 929                   [void.*ndo_get_stats64],
 930                   [OVS_DEFINE([HAVE_VOID_NDO_GET_STATS64])])
 931   OVS_GREP_IFELSE([$KSRC/include/linux/timer.h], [init_timer_deferrable],
 932                   [OVS_DEFINE([HAVE_INIT_TIMER_DEFERRABLE])])
 933   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip_tunnels.h],
 934                         [ip_tunnel_info_opts_set], [flags],
 935                         [OVS_DEFINE([HAVE_IP_TUNNEL_INFO_OPTS_SET_FLAGS])])
 936   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 937                         [rnd],
 938                         [OVS_DEFINE([HAVE_INET_FRAGS_RND])])
 939
 940   if cmp -s datapath/linux/kcompat.h.new \
 941             datapath/linux/kcompat.h >/dev/null 2>&1; then
 942     rm datapath/linux/kcompat.h.new
 943   else
 944     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 945   fi
 946 ])
 947
 948 dnl Checks for net/if_dl.h.
 949 dnl
 950 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 951 dnl or NetBSD.)
 952 AC_DEFUN([OVS_CHECK_IF_DL],
 953   [AC_CHECK_HEADER([net/if_dl.h],
 954                    [HAVE_IF_DL=yes],
 955                    [HAVE_IF_DL=no])
 956    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 957    if test "$HAVE_IF_DL" = yes; then
 958       AC_DEFINE([HAVE_IF_DL], [1],
 959                 [Define to 1 if net/if_dl.h is available.])
 960
 961       # On these platforms we use libpcap to access network devices.
 962       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 963    fi])
 964
 965 dnl Checks for buggy strtok_r.
 966 dnl
 967 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 968 dnl with optimization that can cause segfaults:
 969 dnl
 970 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 971 AC_DEFUN([OVS_CHECK_STRTOK_R],
 972   [AC_CACHE_CHECK(
 973      [whether strtok_r macro segfaults on some inputs],
 974      [ovs_cv_strtok_r_bug],
 975      [AC_RUN_IFELSE(
 976         [AC_LANG_PROGRAM([#include <stdio.h>
 977                           #include <string.h>
 978                          ],
 979                          [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
 980                            /* Assume bug is present, because relatively minor
 981                               changes in compiler settings (e.g. optimization
 982                               level) can make it crop up. */
 983                            return 1;
 984                            #else
 985                            char string[] = ":::";
 986                            char *save_ptr = (char *) 0xc0ffee;
 987                            char *token1, *token2;
 988                            token1 = strtok_r(string, ":", &save_ptr);
 989                            token2 = strtok_r(NULL, ":", &save_ptr);
 990                            freopen ("/dev/null", "w", stdout);
 991                            printf ("%s %s\n", token1, token2);
 992                            return 0;
 993                            #endif
 994                           ]])],
 995         [ovs_cv_strtok_r_bug=no],
 996         [ovs_cv_strtok_r_bug=yes],
 997         [ovs_cv_strtok_r_bug=yes])])
 998    if test $ovs_cv_strtok_r_bug = yes; then
 999      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
1000                [Define if strtok_r macro segfaults on some inputs])
1001    fi
1002 ])
1003
1004 dnl ----------------------------------------------------------------------
1005 dnl These macros are from GNU PSPP, with the following original license:
1006 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
1007 dnl This file is free software; the Free Software Foundation
1008 dnl gives unlimited permission to copy and/or distribute it,
1009 dnl with or without modifications, as long as this notice is preserved.
1010
1011 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
1012   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-= ], [__])])dnl
1013   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
1014     [ovs_save_CFLAGS="$CFLAGS"
1015      dnl Include -Werror in the compiler options, because without -Werror
1016      dnl clang's GCC-compatible compiler driver does not return a failure
1017      dnl exit status even though it complains about options it does not
1018      dnl understand.
1019      dnl
1020      dnl Also, check stderr as gcc exits with status 0 for options
1021      dnl rejected at getopt level.
1022      dnl    % touch /tmp/a.c
1023      dnl    % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
1024      dnl    gcc: unrecognized option '-Qunused-arguments'
1025      dnl    0
1026      dnl    %
1027      dnl
1028      dnl In addition, GCC does not complain about a -Wno-<foo> option that
1029      dnl it does not understand, unless it has another error to report, so
1030      dnl instead of testing for -Wno-<foo>, test for the positive version.
1031      CFLAGS="$CFLAGS $WERROR m4_bpatsubst([$1], [-Wno-], [-W])"
1032      AC_COMPILE_IFELSE(
1033        [AC_LANG_SOURCE([int x;])],
1034        [if test -s conftest.err && grep "unrecognized option" conftest.err
1035         then
1036           ovs_cv_name[]=no
1037         else
1038           ovs_cv_name[]=yes
1039         fi],
1040        [ovs_cv_name[]=no])
1041      CFLAGS="$ovs_save_CFLAGS"])
1042   if test $ovs_cv_name = yes; then
1043     m4_if([$2], [], [:], [$2])
1044   else
1045     m4_if([$3], [], [:], [$3])
1046   fi
1047 ])
1048
1049 dnl OVS_CHECK_WERROR
1050 dnl
1051 dnl Check whether the C compiler accepts -Werror.
1052 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
1053 AC_DEFUN([OVS_CHECK_WERROR],
1054   [WERROR=
1055    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
1056
1057 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
1058 dnl Check whether the given C compiler OPTION is accepted.
1059 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
1060 AC_DEFUN([OVS_CHECK_CC_OPTION],
1061   [AC_REQUIRE([OVS_CHECK_WERROR])
1062    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
1063
1064 dnl OVS_ENABLE_OPTION([OPTION])
1065 dnl Check whether the given C compiler OPTION is accepted.
1066 dnl If so, add it to WARNING_FLAGS.
1067 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
1068 AC_DEFUN([OVS_ENABLE_OPTION],
1069   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
1070    AC_SUBST([WARNING_FLAGS])])
1071
1072 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
1073 dnl Check whether the given C compiler OPTION is accepted.
1074 dnl If so, enable the given Automake CONDITIONAL.
1075
1076 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
1077 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
1078   [OVS_CHECK_CC_OPTION(
1079     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
1080    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
1081 dnl ----------------------------------------------------------------------
1082
1083 dnl Check for too-old XenServer.
1084 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
1085   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
1086     [if test -e /etc/redhat-release; then
1087        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
1088      fi
1089      if test -z "$ovs_cv_xsversion"; then
1090        ovs_cv_xsversion=none
1091      fi])
1092   case $ovs_cv_xsversion in
1093     none)
1094       ;;
1095
1096     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
1097     [[6-9]]* |                           dnl XenServer 6 or later
1098     5.[[7-9]]* |                         dnl XenServer 5.7 or later
1099     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
1100     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
1101     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
1102       ;;
1103
1104     *)
1105       AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported.  (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
1106       ;;
1107   esac])
1108
1109 dnl OVS_CHECK_SPARSE_TARGET
1110 dnl
1111 dnl The "cgcc" script from "sparse" isn't very good at detecting the
1112 dnl target for which the code is being built.  This helps it out.
1113 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
1114   [AC_CACHE_CHECK(
1115     [target hint for cgcc],
1116     [ac_cv_sparse_target],
1117     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
1118        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
1119        [x86_64-*], [ac_cv_sparse_target=x86_64],
1120        [ac_cv_sparse_target=other])])
1121    AS_CASE([$ac_cv_sparse_target],
1122      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
1123      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
1124      [SPARSEFLAGS= CGCCFLAGS=])
1125    AC_SUBST([SPARSEFLAGS])
1126    AC_SUBST([CGCCFLAGS])])
1127
1128 dnl OVS_SPARSE_EXTRA_INCLUDES
1129 dnl
1130 dnl The cgcc script from "sparse" does not search gcc's default
1131 dnl search path. Get the default search path from GCC and pass
1132 dnl them to sparse.
1133 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
1134     AC_SUBST([SPARSE_EXTRA_INCLUDES],
1135            [`$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 ' ' `] ))
1136
1137 dnl OVS_ENABLE_SPARSE
1138 AC_DEFUN([OVS_ENABLE_SPARSE],
1139   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
1140    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
1141    : ${SPARSE=sparse}
1142    AC_SUBST([SPARSE])
1143    AC_CONFIG_COMMANDS_PRE(
1144      [CC='$(if $(C:0=),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) $(SPARSE_WERROR) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'])
1145
1146    AC_ARG_ENABLE(
1147      [sparse],
1148      [AC_HELP_STRING([--enable-sparse], [Run "sparse" by default])],
1149      [], [enable_sparse=no])
1150    AM_CONDITIONAL([ENABLE_SPARSE_BY_DEFAULT], [test $enable_sparse = yes])])
1151
1152 dnl OVS_CTAGS_IDENTIFIERS
1153 dnl
1154 dnl ctags ignores symbols with extras identifiers. This builds a list of
1155 dnl specially handled identifiers to be ignored.
1156 AC_DEFUN([OVS_CTAGS_IDENTIFIERS],
1157     AC_SUBST([OVS_CTAGS_IDENTIFIERS_LIST],
1158            [`printf %s '-I "'; sed -n 's/^#define \(OVS_[A-Z_]\+\)(\.\.\.)$/\1+/p' ${srcdir}/include/openvswitch/compiler.h  | tr \\\n ' ' ; printf '"'`] ))
1159
1160 dnl OVS_PTHREAD_SET_NAME
1161 dnl
1162 dnl This checks for three known variants of pthreads functions for setting
1163 dnl the name of the current thread:
1164 dnl
1165 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
1166 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
1167 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
1168 dnl
1169 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
1170 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
1171 dnl provide to it.
1172 dnl
1173 dnl This macro defines:
1174 dnl
1175 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
1176 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
1177 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
1178 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
1179   [AC_CHECK_FUNCS([pthread_set_name_np])
1180    if test $ac_cv_func_pthread_set_name_np != yes; then
1181      AC_CACHE_CHECK(
1182        [for pthread_setname_np() variant],
1183        [ovs_cv_pthread_setname_np],
1184        [AC_LINK_IFELSE(
1185          [AC_LANG_PROGRAM([#include <pthread.h>
1186   ], [pthread_setname_np(pthread_self(), "name");])],
1187          [ovs_cv_pthread_setname_np=glibc],
1188          [AC_LINK_IFELSE(
1189            [AC_LANG_PROGRAM([#include <pthread.h>
1190 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
1191            [ovs_cv_pthread_setname_np=netbsd],
1192            [ovs_cv_pthread_setname_np=none])])])
1193      case $ovs_cv_pthread_setname_np in # (
1194        glibc)
1195           AC_DEFINE(
1196             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
1197             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
1198           ;; # (
1199        netbsd)
1200           AC_DEFINE(
1201             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
1202             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
1203           ;;
1204      esac
1205    fi])
1206
1207 dnl OVS_CHECK_LINUX_HOST.
1208 dnl
1209 dnl Checks whether we're building for a Linux host, based on the presence of
1210 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
1211 dnl LINUX based on the result.
1212 AC_DEFUN([OVS_CHECK_LINUX_HOST],
1213   [AC_CACHE_CHECK(
1214      [whether __linux__ is defined],
1215      [ovs_cv_linux],
1216      [AC_COMPILE_IFELSE(
1217         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
1218         [ovs_cv_linux=true],
1219         [ovs_cv_linux=false])])
1220    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])