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 17; then
 155           : # Linux 4.x
 156        else
 157           AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 4.17.x is not supported (please refer to the FAQ for advice)])
 158        fi
 159     elif test "$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="$with_dpdk/lib"
 241         ;;
 242     esac
 243
 244     DPDK_LIB="-ldpdk"
 245     DPDK_EXTRA_LIB=""
 246
 247     ovs_save_CFLAGS="$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_COMPILE_IFELSE([
 255       AC_LANG_PROGRAM(
 256         [
 257           #include <rte_config.h>
 258 #if RTE_LIBRTE_VHOST_NUMA
 259 #error
 260 #endif
 261         ], [])
 262       ], [],
 263       [AC_SEARCH_LIBS([get_mempolicy],[numa],[],[AC_MSG_ERROR([unable to find libnuma, install the dependency package])])
 264        DPDK_EXTRA_LIB="-lnuma"
 265        AC_DEFINE([VHOST_NUMA], [1], [NUMA Aware vHost support detected in DPDK.])])
 266
 267     AC_COMPILE_IFELSE([
 268       AC_LANG_PROGRAM(
 269         [
 270           #include <rte_config.h>
 271 #if RTE_LIBRTE_PMD_PCAP
 272 #error
 273 #endif
 274         ], [])
 275       ], [],
 276       [AC_SEARCH_LIBS([pcap_dump],[pcap],[],[AC_MSG_ERROR([unable to find libpcap, install the dependency package])])
 277        DPDK_EXTRA_LIB="-lpcap"
 278        AC_COMPILE_IFELSE([
 279          AC_LANG_PROGRAM(
 280            [
 281              #include <rte_config.h>
 282 #if RTE_LIBRTE_PDUMP
 283 #error
 284 #endif
 285          ], [])
 286        ], [],
 287        [AC_DEFINE([DPDK_PDUMP], [1], [DPDK pdump enabled in OVS.])])
 288      ])
 289
 290     AC_COMPILE_IFELSE([
 291       AC_LANG_PROGRAM(
 292         [
 293           #include <rte_config.h>
 294 #if RTE_LIBRTE_MLX5_PMD
 295 #error
 296 #endif
 297         ], [])
 298       ], [],
 299       [AC_SEARCH_LIBS([mnl_attr_put],[mnl],[],[AC_MSG_ERROR([unable to find libmnl, install the dependency package])])
 300        DPDK_EXTRA_LIB="-lmnl"
 301        AC_DEFINE([DPDK_MNL], [1], [MLX5 PMD detected in DPDK.])])
 302
 303     # On some systems we have to add -ldl to link with dpdk
 304     #
 305     # This code, at first, tries to link without -ldl (""),
 306     # then adds it and tries again.
 307     # Before each attempt the search cache must be unset,
 308     # otherwise autoconf will stick with the old result
 309
 310     DPDKLIB_FOUND=false
 311     save_LIBS=$LIBS
 312     for extras in "" "-ldl"; do
 313         LIBS="$DPDK_LIB $extras $save_LIBS $DPDK_EXTRA_LIB"
 314         AC_LINK_IFELSE(
 315            [AC_LANG_PROGRAM([#include <rte_config.h>
 316                              #include <rte_eal.h>],
 317                             [int rte_argc; char ** rte_argv;
 318                              rte_eal_init(rte_argc, rte_argv);])],
 319            [DPDKLIB_FOUND=true])
 320         if $DPDKLIB_FOUND; then
 321             break
 322         fi
 323     done
 324
 325     # If linking unsuccessful
 326     if test "$DPDKLIB_FOUND" = "false" ; then
 327       if $DPDK_AUTO_DISCOVER; then
 328         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])
 329       else
 330         AC_MSG_ERROR([Could not find DPDK libraries in $DPDK_LIB_DIR])
 331       fi
 332     fi
 333     CFLAGS="$ovs_save_CFLAGS"
 334     LDFLAGS="$ovs_save_LDFLAGS"
 335     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 336       OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
 337     fi
 338     OVS_CFLAGS="$OVS_CFLAGS $DPDK_INCLUDE"
 339     OVS_ENABLE_OPTION([-mssse3])
 340
 341     # DPDK pmd drivers are not linked unless --whole-archive is used.
 342     #
 343     # This happens because the rest of the DPDK code doesn't use any symbol in
 344     # the pmd driver objects, and the drivers register themselves using an
 345     # __attribute__((constructor)) function.
 346     #
 347     # These options are specified inside a single -Wl directive to prevent
 348     # autotools from reordering them.
 349     DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
 350     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 351     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 352   fi
 353
 354   AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
 355 ])
 356
 357 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 358 dnl
 359 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 360 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 361 dnl <REGEX> translated to uppercase.
 362 AC_DEFUN([OVS_GREP_IFELSE], [
 363   AC_MSG_CHECKING([whether $2 matches in $1])
 364   if test -f $1; then
 365     grep '$2' $1 >/dev/null 2>&1
 366     status=$?
 367     case $status in
 368       0)
 369         AC_MSG_RESULT([yes])
 370         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 371         ;;
 372       1)
 373         AC_MSG_RESULT([no])
 374         $4
 375         ;;
 376       *)
 377         AC_MSG_ERROR([grep exited with status $status])
 378         ;;
 379     esac
 380   else
 381     AC_MSG_RESULT([file not found])
 382     $4
 383   fi
 384 ])
 385
 386 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 387 dnl
 388 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
 389 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
 390 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 391 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
 392 dnl translated to uppercase.
 393 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
 394   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 395   if test -f $1; then
 396     awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
 397     status=$?
 398     case $status in
 399       0)
 400         AC_MSG_RESULT([yes])
 401         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 402         ;;
 403       1)
 404         AC_MSG_RESULT([no])
 405         $5
 406         ;;
 407       *)
 408         AC_MSG_ERROR([grep exited with status $status])
 409         ;;
 410     esac
 411   else
 412     AC_MSG_RESULT([file not found])
 413     $5
 414   fi
 415 ])
 416
 417 dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
 418 dnl
 419 dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
 420 dnl the function signature starting from the line matching FUNCTION
 421 dnl and ending with the line containing the closing parenthesis.  If
 422 dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH.  If
 423 dnl IF-MATCH is empty then it defines to
 424 dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
 425 dnl <REGEX> translated to uppercase.
 426 AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
 427   AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
 428   if test -f $1; then
 429     awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
 430     status=$?
 431     case $status in
 432       0)
 433         AC_MSG_RESULT([yes])
 434         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 435         ;;
 436       1)
 437         AC_MSG_RESULT([no])
 438         $5
 439         ;;
 440       *)
 441         AC_MSG_ERROR([grep exited with status $status])
 442         ;;
 443     esac
 444   else
 445     AC_MSG_RESULT([file not found])
 446     $5
 447   fi
 448 ])
 449
 450 dnl OVS_DEFINE(NAME)
 451 dnl
 452 dnl Defines NAME to 1 in kcompat.h.
 453 AC_DEFUN([OVS_DEFINE], [
 454   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 455 ])
 456
 457 dnl OVS_CHECK_LINUX_COMPAT
 458 dnl
 459 dnl Runs various Autoconf checks on the Linux kernel source in
 460 dnl the directory in $KBUILD.
 461 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 462   rm -f datapath/linux/kcompat.h.new
 463   mkdir -p datapath/linux
 464   : > datapath/linux/kcompat.h.new
 465
 466   echo '#include <linux/version.h>
 467 #ifndef RHEL_RELEASE_CODE
 468 #define RHEL_RELEASE_CODE 0
 469 #define RHEL_RELEASE_VERSION(a, b) 0
 470 #endif' >> datapath/linux/kcompat.h.new
 471
 472   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 473                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 474
 475   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6_get_cookie],
 476                   [OVS_DEFINE([HAVE_RT6_GET_COOKIE])])
 477
 478   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
 479                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
 480   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
 481
 482   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 483   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 484   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
 485
 486   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [static_branch_unlikely(],
 487                   [OVS_DEFINE([HAVE_UPSTREAM_STATIC_KEY])])
 488   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [DEFINE_STATIC_KEY_FALSE],
 489                   [OVS_DEFINE([HAVE_DEFINE_STATIC_KEY])])
 490
 491   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 492   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 493
 494   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
 495   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
 496   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 497   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 498   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 499
 500   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 501   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
 502   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 503                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 504   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
 505                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
 506
 507   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
 508                   [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
 509   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
 510                   [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
 511   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 512                         [ip_do_fragment], [net],
 513                         [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
 514   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 515                         [ip_local_out], [net],
 516                         [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
 517
 518   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 519
 520   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
 521                   [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
 522   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
 523   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
 524                   [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
 525   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
 526                   [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
 527   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
 528   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
 529   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 530                         [frags_work])
 531   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 532                         [rwlock])
 533   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
 534                         [list_evictor])
 535   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
 536   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
 537                         [sub_frag_mem_limit], [struct.netns_frags],
 538                         [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
 539   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
 540                   [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
 541   OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
 542                   [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
 543
 544   dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
 545   dnl OVS does not really need ipv6 label field, but its presence signifies that
 546   dnl the stack has all required ipv6 support.
 547   dnl OVS also does not need dst_cache But this dependency allows us to write
 548   dnl much cleaner code.
 549
 550   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
 551                         [label],
 552                         [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
 553                                          [iptunnel_pull_offloads],
 554                         [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 555                         [OVS_GREP_IFELSE([$KSRC/include/net/erspan.h], [erspan_md2],
 556                                          [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])])
 557
 558   OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 559                   [OVS_DEFINE([USE_BUILTIN_DST_CACHE])])
 560   OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
 561                   [OVS_DEFINE([MPLS_HEADER_IS_L3])])
 562   OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
 563                   [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
 564   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
 565   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 566   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 567   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 568   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
 569   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 570   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_gso_error_unwind])
 571   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 572   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
 573   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
 574                   [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
 575   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
 576   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
 577   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_udp_tunnel_add])
 578   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 579   dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
 580   dnl So check type of tstats.
 581   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
 582                   [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
 583   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
 584                   [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
 585   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_csum_hwoffload_help])
 586   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
 587   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
 588                   [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
 589   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
 590   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
 591   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 592                         [extended])
 593   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 594                         [netdev_master_upper_dev_link], [upper_priv],
 595                         [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
 596   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 597                   [netdev_master_upper_dev_link_rh],
 598                   [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_RH])])
 599
 600   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 601                         [max_mtu])
 602   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops_extended],
 603                         [ndo_change_mtu], [OVS_DEFINE([HAVE_RHEL7_MAX_MTU])])
 604
 605   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
 606   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
 607   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
 608                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
 609   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
 610                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
 611   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 612                         [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
 613   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [NFPROTO_INET])
 614
 615
 616   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
 617                         [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 618
 619   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 620                         [nf_conn], [struct timer_list[[ \t]]*timeout],
 621                         [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
 622   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 623                   [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
 624
 625   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 626                   [nf_ct_tmpl_alloc], [nf_conntrack_zone],
 627                   [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
 628   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 629                   [nf_ct_get_tuplepr], [struct.net],
 630                   [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
 631   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 632                   [nf_ct_set])
 633   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 634                   [nf_ct_is_untracked])
 635   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
 636                   [nf_ct_zone_init])
 637   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
 638                   [net_ns_get])
 639   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 640                   [nf_connlabels_get])
 641   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 642                   [nf_connlabels_get], [int bit],
 643                   [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
 644   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 645                         [nf_conn_labels], [words])
 646   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
 647   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
 648   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_range2])
 649   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
 650   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h], [nf_conncount_gc_list],
 651                   [OVS_DEFINE([HAVE_UPSTREAM_NF_CONNCOUNT])])
 652
 653   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
 654   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
 655
 656   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
 657   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
 658   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
 659                   [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
 660   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
 661
 662   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 663                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 664                                    [rcu_read_lock_held])])
 665   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 666   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [net_rwsem])
 667
 668   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 669   # is necessary because some versions of this header remove the
 670   # member but retain the kerneldoc comment that describes it (which
 671   # starts with @).  The brackets must be doubled because of m4
 672   # quoting rules.
 673   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 674                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 675   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
 676   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
 677   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
 678   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
 679   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
 680   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 681   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 682                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 683   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 684                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 685   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 686                   [skb_copy_from_linear_data_offset])
 687   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 688                   [skb_reset_tail_pointer])
 689   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 690   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 691                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 692   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 693   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 694   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 695   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 696   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 697   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 698   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 699   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
 700                   [OVS_DEFINE([HAVE_SKB_GET_HASH])])
 701   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 702   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 703                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 704   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
 705                   [OVS_DEFINE([HAVE_L4_RXHASH])])
 706   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 707   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 708   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
 709   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 710   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
 711   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
 712   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
 713   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
 714   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_put_zero])
 715
 716   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 717                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 718   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 719                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 720   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 721                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 722
 723   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 724   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 725
 726   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
 727   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
 728
 729   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 730   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 731   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 732   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 733                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 734   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 735   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
 736                   [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
 737   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
 738                         [genl_notify], [net],
 739                         [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
 740
 741
 742   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
 743                         [genl_multicast_group], [id])
 744   OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
 745
 746   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 747   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 748   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 749   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
 750   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
 751   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
 752                   [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
 753   OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
 754                   [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
 755
 756   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
 757   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 758   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 759   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 760   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 761   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
 762   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 763   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 764   OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
 765                   [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
 766   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
 767                         [nla_parse], [netlink_ext_ack],
 768                         [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
 769
 770   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 771
 772   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 773                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 774   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 775   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 776   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
 777   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
 778   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
 779
 780   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/dst_metadata.h],
 781                         [metadata_dst_alloc], [metadata_type])
 782
 783   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 784
 785   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 786                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 787   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 788                   [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
 789                                    [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
 790   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
 791   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
 792   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
 793                   [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
 794   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
 795                         [gro_receive])
 796
 797   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
 798                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 799   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 800                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 801
 802   OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
 803   OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
 804   OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
 805                   [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
 806   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
 807                         [udp_add_offload], [net],
 808                         [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
 809   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 810                         [nf_defrag_ipv6_enable], [net],
 811                         [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
 812   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [family_list],
 813                         [OVS_DEFINE([HAVE_GENL_FAMILY_LIST])])
 814   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 815                         [needs_free_netdev],
 816                         [OVS_DEFINE([HAVE_NEEDS_FREE_NETDEV])])
 817   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_dev], [cfg],
 818                         [OVS_DEFINE([HAVE_VXLAN_DEV_CFG])])
 819   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
 820                   [nf_conntrack_helper_put],
 821                   [OVS_DEFINE(HAVE_NF_CONNTRACK_HELPER_PUT)])
 822   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],[[[[:space:]]]SKB_GSO_UDP[[[:space:]]]],
 823                   [OVS_DEFINE([HAVE_SKB_GSO_UDP])])
 824   OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
 825                   [OVS_DEFINE([HAVE_DST_NOCACHE])])
 826   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
 827                         [extack],
 828                   [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
 829   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 830                         [list],
 831                         [OVS_DEFINE([HAVE_LIST_IN_NF_HOOK_OPS])])
 832   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netfilter/nf_conntrack_common.h],
 833                   [IP_CT_UNTRACKED])
 834   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 835                         [netdev_master_upper_dev_link], [extack],
 836                         [OVS_DEFINE([HAVE_UPPER_DEV_LINK_EXTACK])])
 837   OVS_GREP_IFELSE([$KSRC/include/linux/compiler_types.h],
 838                   [__LINUX_COMPILER_TYPES_H],
 839                   [OVS_DEFINE([HAVE_LINUX_COMPILER_TYPES_H])])
 840   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 841                   [ktime_get_ts64],
 842                   [OVS_DEFINE([HAVE_KTIME_GET_TS64])])
 843   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h],
 844                   [EXPORT_SYMBOL_GPL(peernet2id_alloc)],
 845                   [OVS_DEFINE([HAVE_PEERNET2ID_ALLOC])])
 846   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 847                   [ktime_get_ns],
 848                   [OVS_DEFINE([HAVE_KTIME_GET_NS])])
 849   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h],
 850                   frag_percpu_counter_batch[],
 851                   [OVS_DEFINE([HAVE_FRAG_PERCPU_COUNTER_BATCH])])
 852   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 853                   [null_compute_pseudo],
 854                   [OVS_DEFINE([HAVE_NULL_COMPUTE_PSEUDO])])
 855   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 856                   [__skb_checksum_convert],
 857                   [OVS_DEFINE([HAVE_SKB_CHECKSUM_CONVERT])])
 858   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 859                         [max_mtu],
 860                         [OVS_DEFINE([HAVE_NET_DEVICE_MAX_MTU])])
 861   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip6_tunnel.h], [__ip6_tnl_parm],
 862                         [erspan_ver],
 863                         [OVS_DEFINE([HAVE_IP6_TNL_PARM_ERSPAN_VER])])
 864   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 865                   [SKB_GSO_IPXIP6],
 866                   [OVS_DEFINE([HAVE_SKB_GSO_IPXIP6])])
 867   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ipv6.h],
 868                         [ip6_make_flowlabel], [fl6],
 869                         [OVS_DEFINE([HAVE_IP6_MAKE_FLOWLABEL_FL6])])
 870   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ipv6.h], [netns_sysctl_ipv6],
 871                         [auto_flowlabels],
 872                         [OVS_DEFINE([HAVE_NETNS_SYSCTL_IPV6_AUTO_FLOWLABELS])])
 873   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 874                   [netif_keep_dst],
 875                   [OVS_DEFINE([HAVE_NETIF_KEEP_DST])])
 876   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 877                         [ndo_get_iflink],
 878                         [OVS_DEFINE([HAVE_NDO_GET_IFLINK])])
 879   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 880                   [skb_set_inner_ipproto],
 881                   [OVS_DEFINE([HAVE_SKB_SET_INNER_IPPROTO])])
 882   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 883                   [tunnel_encap_types],
 884                   [OVS_DEFINE([HAVE_TUNNEL_ENCAP_TYPES])])
 885   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 886                   [IFLA_IPTUN_ENCAP_TYPE],
 887                   [OVS_DEFINE([HAVE_IFLA_IPTUN_ENCAP_TYPE])])
 888   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 889                   [IFLA_IPTUN_COLLECT_METADATA],
 890                   [OVS_DEFINE([HAVE_IFLA_IPTUN_COLLECT_METADATA])])
 891   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 892                   [IFLA_GRE_ENCAP_DPORT])
 893   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 894                   [IFLA_GRE_COLLECT_METADATA])
 895   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 896                   [IFLA_GRE_IGNORE_DF])
 897   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 898                   [IFLA_GRE_FWMARK])
 899   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 900                   [IFLA_GRE_ERSPAN_INDEX])
 901   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 902                   [IFLA_GRE_ERSPAN_HWID])
 903   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 904                   [IFLA_IPTUN_FWMARK])
 905   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
 906                         [csum_valid],
 907                         [OVS_DEFINE([HAVE_SKBUFF_CSUM_VALID])])
 908   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 909                   [skb_checksum_simple_validate])
 910   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 911                   [void.*ndo_get_stats64],
 912                   [OVS_DEFINE([HAVE_VOID_NDO_GET_STATS64])])
 913   OVS_GREP_IFELSE([$KSRC/include/linux/timer.h], [init_timer_deferrable],
 914                   [OVS_DEFINE([HAVE_INIT_TIMER_DEFERRABLE])])
 915   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip_tunnels.h],
 916                         [ip_tunnel_info_opts_set], [flags],
 917                         [OVS_DEFINE([HAVE_IP_TUNNEL_INFO_OPTS_SET_FLAGS])])
 918   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 919                         [rnd],
 920                         [OVS_DEFINE([HAVE_INET_FRAGS_RND])])
 921
 922   if cmp -s datapath/linux/kcompat.h.new \
 923             datapath/linux/kcompat.h >/dev/null 2>&1; then
 924     rm datapath/linux/kcompat.h.new
 925   else
 926     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 927   fi
 928 ])
 929
 930 dnl Checks for net/if_dl.h.
 931 dnl
 932 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 933 dnl or NetBSD.)
 934 AC_DEFUN([OVS_CHECK_IF_DL],
 935   [AC_CHECK_HEADER([net/if_dl.h],
 936                    [HAVE_IF_DL=yes],
 937                    [HAVE_IF_DL=no])
 938    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 939    if test "$HAVE_IF_DL" = yes; then
 940       AC_DEFINE([HAVE_IF_DL], [1],
 941                 [Define to 1 if net/if_dl.h is available.])
 942
 943       # On these platforms we use libpcap to access network devices.
 944       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 945    fi])
 946
 947 dnl Checks for buggy strtok_r.
 948 dnl
 949 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 950 dnl with optimization that can cause segfaults:
 951 dnl
 952 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 953 AC_DEFUN([OVS_CHECK_STRTOK_R],
 954   [AC_CACHE_CHECK(
 955      [whether strtok_r macro segfaults on some inputs],
 956      [ovs_cv_strtok_r_bug],
 957      [AC_RUN_IFELSE(
 958         [AC_LANG_PROGRAM([#include <stdio.h>
 959                           #include <string.h>
 960                          ],
 961                          [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
 962                            /* Assume bug is present, because relatively minor
 963                               changes in compiler settings (e.g. optimization
 964                               level) can make it crop up. */
 965                            return 1;
 966                            #else
 967                            char string[] = ":::";
 968                            char *save_ptr = (char *) 0xc0ffee;
 969                            char *token1, *token2;
 970                            token1 = strtok_r(string, ":", &save_ptr);
 971                            token2 = strtok_r(NULL, ":", &save_ptr);
 972                            freopen ("/dev/null", "w", stdout);
 973                            printf ("%s %s\n", token1, token2);
 974                            return 0;
 975                            #endif
 976                           ]])],
 977         [ovs_cv_strtok_r_bug=no],
 978         [ovs_cv_strtok_r_bug=yes],
 979         [ovs_cv_strtok_r_bug=yes])])
 980    if test $ovs_cv_strtok_r_bug = yes; then
 981      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 982                [Define if strtok_r macro segfaults on some inputs])
 983    fi
 984 ])
 985
 986 dnl ----------------------------------------------------------------------
 987 dnl These macros are from GNU PSPP, with the following original license:
 988 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 989 dnl This file is free software; the Free Software Foundation
 990 dnl gives unlimited permission to copy and/or distribute it,
 991 dnl with or without modifications, as long as this notice is preserved.
 992
 993 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
 994   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-= ], [__])])dnl
 995   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 996     [ovs_save_CFLAGS="$CFLAGS"
 997      dnl Include -Werror in the compiler options, because without -Werror
 998      dnl clang's GCC-compatible compiler driver does not return a failure
 999      dnl exit status even though it complains about options it does not
1000      dnl understand.
1001      dnl
1002      dnl Also, check stderr as gcc exits with status 0 for options
1003      dnl rejected at getopt level.
1004      dnl    % touch /tmp/a.c
1005      dnl    % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
1006      dnl    gcc: unrecognized option '-Qunused-arguments'
1007      dnl    0
1008      dnl    %
1009      dnl
1010      dnl In addition, GCC does not complain about a -Wno-<foo> option that
1011      dnl it does not understand, unless it has another error to report, so
1012      dnl instead of testing for -Wno-<foo>, test for the positive version.
1013      CFLAGS="$CFLAGS $WERROR m4_bpatsubst([$1], [-Wno-], [-W])"
1014      AC_COMPILE_IFELSE(
1015        [AC_LANG_SOURCE([int x;])],
1016        [if test -s conftest.err && grep "unrecognized option" conftest.err
1017         then
1018           ovs_cv_name[]=no
1019         else
1020           ovs_cv_name[]=yes
1021         fi],
1022        [ovs_cv_name[]=no])
1023      CFLAGS="$ovs_save_CFLAGS"])
1024   if test $ovs_cv_name = yes; then
1025     m4_if([$2], [], [:], [$2])
1026   else
1027     m4_if([$3], [], [:], [$3])
1028   fi
1029 ])
1030
1031 dnl OVS_CHECK_WERROR
1032 dnl
1033 dnl Check whether the C compiler accepts -Werror.
1034 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
1035 AC_DEFUN([OVS_CHECK_WERROR],
1036   [WERROR=
1037    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
1038
1039 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
1040 dnl Check whether the given C compiler OPTION is accepted.
1041 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
1042 AC_DEFUN([OVS_CHECK_CC_OPTION],
1043   [AC_REQUIRE([OVS_CHECK_WERROR])
1044    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
1045
1046 dnl OVS_ENABLE_OPTION([OPTION])
1047 dnl Check whether the given C compiler OPTION is accepted.
1048 dnl If so, add it to WARNING_FLAGS.
1049 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
1050 AC_DEFUN([OVS_ENABLE_OPTION],
1051   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
1052    AC_SUBST([WARNING_FLAGS])])
1053
1054 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
1055 dnl Check whether the given C compiler OPTION is accepted.
1056 dnl If so, enable the given Automake CONDITIONAL.
1057
1058 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
1059 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
1060   [OVS_CHECK_CC_OPTION(
1061     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
1062    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
1063 dnl ----------------------------------------------------------------------
1064
1065 dnl Check for too-old XenServer.
1066 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
1067   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
1068     [if test -e /etc/redhat-release; then
1069        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
1070      fi
1071      if test -z "$ovs_cv_xsversion"; then
1072        ovs_cv_xsversion=none
1073      fi])
1074   case $ovs_cv_xsversion in
1075     none)
1076       ;;
1077
1078     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
1079     [[6-9]]* |                           dnl XenServer 6 or later
1080     5.[[7-9]]* |                         dnl XenServer 5.7 or later
1081     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
1082     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
1083     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
1084       ;;
1085
1086     *)
1087       AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported.  (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
1088       ;;
1089   esac])
1090
1091 dnl OVS_CHECK_SPARSE_TARGET
1092 dnl
1093 dnl The "cgcc" script from "sparse" isn't very good at detecting the
1094 dnl target for which the code is being built.  This helps it out.
1095 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
1096   [AC_CACHE_CHECK(
1097     [target hint for cgcc],
1098     [ac_cv_sparse_target],
1099     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
1100        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
1101        [x86_64-*], [ac_cv_sparse_target=x86_64],
1102        [ac_cv_sparse_target=other])])
1103    AS_CASE([$ac_cv_sparse_target],
1104      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
1105      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
1106      [SPARSEFLAGS= CGCCFLAGS=])
1107    AC_SUBST([SPARSEFLAGS])
1108    AC_SUBST([CGCCFLAGS])])
1109
1110 dnl OVS_SPARSE_EXTRA_INCLUDES
1111 dnl
1112 dnl The cgcc script from "sparse" does not search gcc's default
1113 dnl search path. Get the default search path from GCC and pass
1114 dnl them to sparse.
1115 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
1116     AC_SUBST([SPARSE_EXTRA_INCLUDES],
1117            [`$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 ' ' `] ))
1118
1119 dnl OVS_ENABLE_SPARSE
1120 AC_DEFUN([OVS_ENABLE_SPARSE],
1121   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
1122    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
1123    : ${SPARSE=sparse}
1124    AC_SUBST([SPARSE])
1125    AC_CONFIG_COMMANDS_PRE(
1126      [CC='$(if $(C:0=),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) $(SPARSE_WERROR) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'])
1127
1128    AC_ARG_ENABLE(
1129      [sparse],
1130      [AC_HELP_STRING([--enable-sparse], [Run "sparse" by default])],
1131      [], [enable_sparse=no])
1132    AM_CONDITIONAL([ENABLE_SPARSE_BY_DEFAULT], [test $enable_sparse = yes])])
1133
1134 dnl OVS_CTAGS_IDENTIFIERS
1135 dnl
1136 dnl ctags ignores symbols with extras identifiers. This builds a list of
1137 dnl specially handled identifiers to be ignored.
1138 AC_DEFUN([OVS_CTAGS_IDENTIFIERS],
1139     AC_SUBST([OVS_CTAGS_IDENTIFIERS_LIST],
1140            [`printf %s '-I "'; sed -n 's/^#define \(OVS_[A-Z_]\+\)(\.\.\.)$/\1+/p' ${srcdir}/include/openvswitch/compiler.h  | tr \\\n ' ' ; printf '"'`] ))
1141
1142 dnl OVS_PTHREAD_SET_NAME
1143 dnl
1144 dnl This checks for three known variants of pthreads functions for setting
1145 dnl the name of the current thread:
1146 dnl
1147 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
1148 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
1149 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
1150 dnl
1151 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
1152 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
1153 dnl provide to it.
1154 dnl
1155 dnl This macro defines:
1156 dnl
1157 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
1158 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
1159 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
1160 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
1161   [AC_CHECK_FUNCS([pthread_set_name_np])
1162    if test $ac_cv_func_pthread_set_name_np != yes; then
1163      AC_CACHE_CHECK(
1164        [for pthread_setname_np() variant],
1165        [ovs_cv_pthread_setname_np],
1166        [AC_LINK_IFELSE(
1167          [AC_LANG_PROGRAM([#include <pthread.h>
1168   ], [pthread_setname_np(pthread_self(), "name");])],
1169          [ovs_cv_pthread_setname_np=glibc],
1170          [AC_LINK_IFELSE(
1171            [AC_LANG_PROGRAM([#include <pthread.h>
1172 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
1173            [ovs_cv_pthread_setname_np=netbsd],
1174            [ovs_cv_pthread_setname_np=none])])])
1175      case $ovs_cv_pthread_setname_np in # (
1176        glibc)
1177           AC_DEFINE(
1178             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
1179             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
1180           ;; # (
1181        netbsd)
1182           AC_DEFINE(
1183             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
1184             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
1185           ;;
1186      esac
1187    fi])
1188
1189 dnl OVS_CHECK_LINUX_HOST.
1190 dnl
1191 dnl Checks whether we're building for a Linux host, based on the presence of
1192 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
1193 dnl LINUX based on the result.
1194 AC_DEFUN([OVS_CHECK_LINUX_HOST],
1195   [AC_CACHE_CHECK(
1196      [whether __linux__ is defined],
1197      [ovs_cv_linux],
1198      [AC_COMPILE_IFELSE(
1199         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
1200         [ovs_cv_linux=true],
1201         [ovs_cv_linux=false])])
1202    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])