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 dnl OVS_CHECK_LINUX
  29 dnl
  30 dnl Configure linux kernel source tree
  31 AC_DEFUN([OVS_CHECK_LINUX], [
  32   AC_ARG_WITH([linux],
  33               [AC_HELP_STRING([--with-linux=/path/to/linux],
  34                               [Specify the Linux kernel build directory])])
  35   AC_ARG_WITH([linux-source],
  36               [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
  37                               [Specify the Linux kernel source directory
  38                                (usually figured out automatically from build
  39                                directory)])])
  40
  41   # Deprecated equivalents to --with-linux, --with-linux-source.
  42   AC_ARG_WITH([l26])
  43   AC_ARG_WITH([l26-source])
  44
  45   if test X"$with_linux" != X; then
  46     KBUILD=$with_linux
  47   elif test X"$with_l26" != X; then
  48     KBUILD=$with_l26
  49     AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
  50   else
  51     KBUILD=
  52   fi
  53
  54   if test X"$KBUILD" != X; then
  55     if test X"$with_linux_source" != X; then
  56       KSRC=$with_linux_source
  57     elif test X"$with_l26_source" != X; then
  58       KSRC=$with_l26_source
  59       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
  60     else
  61       KSRC=
  62     fi
  63   elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
  64     AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
  65   fi
  66
  67   if test -n "$KBUILD"; then
  68     KBUILD=`eval echo "$KBUILD"`
  69     case $KBUILD in
  70         /*) ;;
  71         *) KBUILD=`pwd`/$KBUILD ;;
  72     esac
  73
  74     # The build directory is what the user provided.
  75     # Make sure that it exists.
  76     AC_MSG_CHECKING([for Linux build directory])
  77     if test -d "$KBUILD"; then
  78         AC_MSG_RESULT([$KBUILD])
  79         AC_SUBST(KBUILD)
  80     else
  81         AC_MSG_RESULT([no])
  82         AC_ERROR([source dir $KBUILD doesn't exist])
  83     fi
  84
  85     # Debian breaks kernel headers into "source" header and "build" headers.
  86     # We want the source headers, but $KBUILD gives us the "build" headers.
  87     # Use heuristics to find the source headers.
  88     AC_MSG_CHECKING([for Linux source directory])
  89     if test -n "$KSRC"; then
  90       KSRC=`eval echo "$KSRC"`
  91       case $KSRC in
  92           /*) ;;
  93           *) KSRC=`pwd`/$KSRC ;;
  94       esac
  95       if test ! -e $KSRC/include/linux/kernel.h; then
  96         AC_MSG_ERROR([$KSRC is not a kernel source directory])
  97       fi
  98     else
  99       KSRC=$KBUILD
 100       if test ! -e $KSRC/include/linux/kernel.h; then
 101         # Debian kernel build Makefiles tend to include a line of the form:
 102         # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
 103         # First try to extract the source directory from this line.
 104         KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
 105         if test ! -e "$KSRC"/include/linux/kernel.h; then
 106           # Didn't work.  Fall back to name-based heuristics that used to work.
 107           case `echo "$KBUILD" | sed 's,/*$,,'` in # (
 108             */build)
 109               KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
 110               ;; # (
 111             *)
 112               KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
 113               ;;
 114           esac
 115         fi
 116       fi
 117       if test ! -e "$KSRC"/include/linux/kernel.h; then
 118         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
 119       fi
 120     fi
 121     AC_MSG_RESULT([$KSRC])
 122
 123     AC_MSG_CHECKING([for kernel version])
 124     version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
 125     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
 126     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
 127     if test X"$version" = X || test X"$patchlevel" = X; then
 128        AC_ERROR([cannot determine kernel version])
 129     elif test X"$sublevel" = X; then
 130        kversion=$version.$patchlevel
 131     else
 132        kversion=$version.$patchlevel.$sublevel
 133     fi
 134     AC_MSG_RESULT([$kversion])
 135
 136     if test "$version" -ge 4; then
 137        if test "$version" = 4 && test "$patchlevel" -le 11; then
 138           : # Linux 4.x
 139        else
 140           AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 4.11.x is not supported (please refer to the FAQ for advice)])
 141        fi
 142     elif test "$version" = 3 && test "$patchlevel" -ge 10; then
 143        : # Linux 3.x
 144     else
 145        AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 3.10 or later is required])
 146     fi
 147     if (test ! -e "$KBUILD"/include/linux/version.h && \
 148         test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
 149        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 150         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 151         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 152     fi
 153     OVS_CHECK_LINUX_COMPAT
 154   fi
 155   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 156 ])
 157
 158 dnl OVS_CHECK_LINUX_TC
 159 dnl
 160 dnl Configure Linux tc compat.
 161 AC_DEFUN([OVS_CHECK_LINUX_TC], [
 162   AC_COMPILE_IFELSE([
 163     AC_LANG_PROGRAM([#include <linux/pkt_cls.h>], [
 164         int x = TCA_ACT_COOKIE;
 165     ])],
 166     [AC_DEFINE([HAVE_TCA_ACT_COOKIE], [1],
 167                [Define to 1 if TCA_ACT_COOKIE is avaiable.])])
 168
 169   AC_COMPILE_IFELSE([
 170     AC_LANG_PROGRAM([#include <linux/tc_act/tc_vlan.h>], [
 171         int x = TCA_VLAN_PUSH_VLAN_PRIORITY;
 172     ])],
 173     [AC_DEFINE([HAVE_TCA_VLAN_PUSH_VLAN_PRIORITY], [1],
 174                [Define to 1 if TCA_VLAN_PUSH_VLAN_PRIORITY is avaiable.])])
 175
 176   AC_COMPILE_IFELSE([
 177     AC_LANG_PROGRAM([#include <linux/tc_act/tc_tunnel_key.h>], [
 178         int x = TCA_TUNNEL_KEY_ENC_DST_PORT;
 179     ])],
 180     [AC_DEFINE([HAVE_TCA_TUNNEL_KEY_ENC_DST_PORT], [1],
 181                [Define to 1 if TCA_TUNNEL_KEY_ENC_DST_PORT is avaiable.])])
 182 ])
 183
 184 dnl OVS_CHECK_DPDK
 185 dnl
 186 dnl Configure DPDK source tree
 187 AC_DEFUN([OVS_CHECK_DPDK], [
 188   AC_ARG_WITH([dpdk],
 189               [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
 190                               [Specify the DPDK build directory])],
 191               [have_dpdk=true])
 192
 193   AC_MSG_CHECKING([whether dpdk datapath is enabled])
 194   if test "$have_dpdk" != true || test "$with_dpdk" = no; then
 195     AC_MSG_RESULT([no])
 196     DPDKLIB_FOUND=false
 197   else
 198     AC_MSG_RESULT([yes])
 199     case "$with_dpdk" in
 200       yes)
 201         DPDK_AUTO_DISCOVER="true"
 202         DPDK_INCLUDE="/usr/local/include/dpdk -I/usr/include/dpdk"
 203         ;;
 204       *)
 205         DPDK_AUTO_DISCOVER="false"
 206         DPDK_INCLUDE="$with_dpdk/include"
 207         # If 'with_dpdk' is passed install directory, point to headers
 208         # installed in $DESTDIR/$prefix/include/dpdk
 209         AC_CHECK_FILE([$DPDK_INCLUDE/rte_config.h], [],
 210                       [AC_CHECK_FILE([$DPDK_INCLUDE/dpdk/rte_config.h],
 211                                      [DPDK_INCLUDE=$DPDK_INCLUDE/dpdk], [])])
 212         DPDK_LIB_DIR="$with_dpdk/lib"
 213         ;;
 214     esac
 215
 216     DPDK_LIB="-ldpdk"
 217     DPDK_EXTRA_LIB=""
 218
 219     ovs_save_CFLAGS="$CFLAGS"
 220     ovs_save_LDFLAGS="$LDFLAGS"
 221     CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
 222     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 223       LDFLAGS="$LDFLAGS -L${DPDK_LIB_DIR}"
 224     fi
 225
 226     AC_COMPILE_IFELSE([
 227       AC_LANG_PROGRAM(
 228         [
 229           #include <rte_config.h>
 230 #if RTE_LIBRTE_VHOST_NUMA
 231 #error
 232 #endif
 233         ], [])
 234       ], [],
 235       [AC_SEARCH_LIBS([get_mempolicy],[numa],[],[AC_MSG_ERROR([unable to find libnuma, install the dependency package])])
 236        DPDK_EXTRA_LIB="-lnuma"
 237        AC_DEFINE([VHOST_NUMA], [1], [NUMA Aware vHost support detected in DPDK.])])
 238
 239     AC_COMPILE_IFELSE([
 240       AC_LANG_PROGRAM(
 241         [
 242           #include <rte_config.h>
 243 #if RTE_LIBRTE_PMD_PCAP
 244 #error
 245 #endif
 246         ], [])
 247       ], [],
 248       [AC_SEARCH_LIBS([pcap_dump],[pcap],[],[AC_MSG_ERROR([unable to find libpcap, install the dependency package])])
 249        DPDK_EXTRA_LIB="-lpcap"
 250        AC_COMPILE_IFELSE([
 251          AC_LANG_PROGRAM(
 252            [
 253              #include <rte_config.h>
 254 #if RTE_LIBRTE_PDUMP
 255 #error
 256 #endif
 257          ], [])
 258        ], [],
 259        [AC_DEFINE([DPDK_PDUMP], [1], [DPDK pdump enabled in OVS.])])
 260      ])
 261
 262     # On some systems we have to add -ldl to link with dpdk
 263     #
 264     # This code, at first, tries to link without -ldl (""),
 265     # then adds it and tries again.
 266     # Before each attempt the search cache must be unset,
 267     # otherwise autoconf will stick with the old result
 268
 269     DPDKLIB_FOUND=false
 270     save_LIBS=$LIBS
 271     for extras in "" "-ldl"; do
 272         LIBS="$DPDK_LIB $extras $save_LIBS $DPDK_EXTRA_LIB"
 273         AC_LINK_IFELSE(
 274            [AC_LANG_PROGRAM([#include <rte_config.h>
 275                              #include <rte_eal.h>],
 276                             [int rte_argc; char ** rte_argv;
 277                              rte_eal_init(rte_argc, rte_argv);])],
 278            [DPDKLIB_FOUND=true])
 279         if $DPDKLIB_FOUND; then
 280             break
 281         fi
 282     done
 283
 284     # If linking unsuccessful
 285     if test "$DPDKLIB_FOUND" = "false" ; then
 286       if $DPDK_AUTO_DISCOVER; then
 287         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])
 288       else
 289         AC_MSG_ERROR([Could not find DPDK libraries in $DPDK_LIB_DIR])
 290       fi
 291     fi
 292     CFLAGS="$ovs_save_CFLAGS"
 293     LDFLAGS="$ovs_save_LDFLAGS"
 294     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 295       OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
 296     fi
 297     OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE"
 298     OVS_ENABLE_OPTION([-mssse3])
 299
 300     # DPDK pmd drivers are not linked unless --whole-archive is used.
 301     #
 302     # This happens because the rest of the DPDK code doesn't use any symbol in
 303     # the pmd driver objects, and the drivers register themselves using an
 304     # __attribute__((constructor)) function.
 305     #
 306     # These options are specified inside a single -Wl directive to prevent
 307     # autotools from reordering them.
 308     DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
 309     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 310     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 311   fi
 312
 313   AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
 314 ])
 315
 316 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 317 dnl
 318 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 319 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 320 dnl <REGEX> translated to uppercase.
 321 AC_DEFUN([OVS_GREP_IFELSE], [
 322   AC_MSG_CHECKING([whether $2 matches in $1])
 323   if test -f $1; then
 324     grep '$2' $1 >/dev/null 2>&1
 325     status=$?
 326     case $status in
 327       0)
 328         AC_MSG_RESULT([yes])
 329         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 330         ;;
 331       1)
 332         AC_MSG_RESULT([no])
 333         $4
 334         ;;
 335       *)
 336         AC_MSG_ERROR([grep exited with status $status])
 337         ;;
 338     esac
 339   else
 340     AC_MSG_RESULT([file not found])
 341     $4
 342   fi
 343 ])
 344
 345 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 346 dnl
 347 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
 348 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
 349 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 350 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
 351 dnl translated to uppercase.
 352 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
 353   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 354   if test -f $1; then
 355     awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
 356     status=$?
 357     case $status in
 358       0)
 359         AC_MSG_RESULT([yes])
 360         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 361         ;;
 362       1)
 363         AC_MSG_RESULT([no])
 364         $5
 365         ;;
 366       *)
 367         AC_MSG_ERROR([grep exited with status $status])
 368         ;;
 369     esac
 370   else
 371     AC_MSG_RESULT([file not found])
 372     $5
 373   fi
 374 ])
 375
 376 dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
 377 dnl
 378 dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
 379 dnl the function signature starting from the line matching FUNCTION
 380 dnl and ending with the line containing the closing parenthesis.  If
 381 dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH.  If
 382 dnl IF-MATCH is empty then it defines to
 383 dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
 384 dnl <REGEX> translated to uppercase.
 385 AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
 386   AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
 387   if test -f $1; then
 388     awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
 389     status=$?
 390     case $status in
 391       0)
 392         AC_MSG_RESULT([yes])
 393         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 394         ;;
 395       1)
 396         AC_MSG_RESULT([no])
 397         $5
 398         ;;
 399       *)
 400         AC_MSG_ERROR([grep exited with status $status])
 401         ;;
 402     esac
 403   else
 404     AC_MSG_RESULT([file not found])
 405     $5
 406   fi
 407 ])
 408
 409 dnl OVS_DEFINE(NAME)
 410 dnl
 411 dnl Defines NAME to 1 in kcompat.h.
 412 AC_DEFUN([OVS_DEFINE], [
 413   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 414 ])
 415
 416 dnl OVS_CHECK_LINUX_COMPAT
 417 dnl
 418 dnl Runs various Autoconf checks on the Linux kernel source in
 419 dnl the directory in $KBUILD.
 420 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 421   rm -f datapath/linux/kcompat.h.new
 422   mkdir -p datapath/linux
 423   : > datapath/linux/kcompat.h.new
 424
 425   echo '#include <linux/version.h>
 426 #ifndef RHEL_RELEASE_CODE
 427 #define RHEL_RELEASE_CODE 0
 428 #define RHEL_RELEASE_VERSION(a, b) 0
 429 #endif' >> datapath/linux/kcompat.h.new
 430
 431   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 432                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 433
 434   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
 435                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
 436   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
 437
 438   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 439   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 440   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
 441
 442   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 443   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 444
 445   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
 446   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
 447   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 448   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 449   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 450
 451   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 452   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
 453   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 454                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 455   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
 456                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
 457
 458   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
 459                   [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
 460   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
 461                   [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
 462   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 463                         [ip_do_fragment], [net],
 464                         [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
 465   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 466                         [ip_local_out], [net],
 467                         [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
 468
 469   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 470
 471   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
 472                   [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
 473   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
 474   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
 475                   [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
 476   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
 477                   [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
 478   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
 479   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
 480   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 481                         [frags_work])
 482   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 483                         [rwlock])
 484   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
 485                         [list_evictor])
 486   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
 487   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
 488                         [sub_frag_mem_limit], [struct.netns_frags],
 489                         [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
 490   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
 491                   [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
 492   OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
 493                   [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
 494
 495   dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
 496   dnl OVS does not really need ipv6 label field, but its presence signifies that
 497   dnl the stack has all required ipv6 support.
 498   dnl OVS also does not need dst_cache But this dependency allows us to write
 499   dnl much cleaner code.
 500
 501   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
 502                         [label],
 503                         [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
 504                                          [iptunnel_pull_offloads],
 505                         [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 506                                          [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])
 507
 508   OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
 509                   [OVS_DEFINE([MPLS_HEADER_IS_L3])])
 510   OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
 511                   [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
 512   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
 513   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 514   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 515   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 516   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
 517   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 518   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 519   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
 520   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
 521                   [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
 522   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
 523   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
 524   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 525   dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
 526   dnl So check type of tstats.
 527   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
 528                   [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
 529   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
 530                   [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
 531   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
 532   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
 533                   [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
 534   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
 535   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
 536   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 537                         [extended])
 538   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 539                         [netdev_master_upper_dev_link], [upper_priv],
 540                         [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
 541   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 542                         [max_mtu])
 543
 544   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
 545   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
 546   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
 547                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
 548   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
 549                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
 550   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 551                         [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
 552
 553   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
 554                         [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 555
 556   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 557                         [nf_conn], [struct timer_list[[ \t]]*timeout],
 558                         [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
 559   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 560                   [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
 561
 562   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 563                   [nf_ct_tmpl_alloc], [nf_conntrack_zone],
 564                   [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
 565   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 566                   [nf_ct_get_tuplepr], [struct.net],
 567                   [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
 568   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 569                   [nf_ct_set])
 570   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 571                   [nf_ct_is_untracked])
 572   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
 573                   [nf_ct_zone_init])
 574   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 575                   [nf_connlabels_get])
 576   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 577                   [nf_connlabels_get], [int bit],
 578                   [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
 579   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 580                         [nf_conn_labels], [words])
 581   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
 582   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
 583   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
 584
 585   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
 586   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
 587
 588   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
 589   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
 590   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
 591                   [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
 592   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
 593
 594   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 595                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 596                                    [rcu_read_lock_held])])
 597   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 598
 599   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 600   # is necessary because some versions of this header remove the
 601   # member but retain the kerneldoc comment that describes it (which
 602   # starts with @).  The brackets must be doubled because of m4
 603   # quoting rules.
 604   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 605                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 606   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
 607   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
 608   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
 609   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
 610   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
 611   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 612   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 613                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 614   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 615                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 616   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 617                   [skb_copy_from_linear_data_offset])
 618   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 619                   [skb_reset_tail_pointer])
 620   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 621   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 622                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 623   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 624   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 625   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 626   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 627   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 628   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 629   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 630   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
 631                   [OVS_DEFINE([HAVE_SKB_GET_HASH])])
 632   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 633   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 634                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 635   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
 636                   [OVS_DEFINE([HAVE_L4_RXHASH])])
 637   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 638   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 639   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
 640   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 641   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
 642   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
 643   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
 644   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
 645
 646   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 647                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 648   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 649                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 650   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 651                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 652
 653   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 654   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 655
 656   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
 657   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
 658
 659   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 660   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 661   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 662   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 663                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 664   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 665   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
 666                   [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
 667   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
 668                         [genl_notify], [net],
 669                         [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
 670
 671
 672   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
 673                         [genl_multicast_group], [id])
 674   OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
 675
 676   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 677   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 678   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 679   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
 680   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
 681   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
 682                   [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
 683   OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
 684                   [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
 685
 686   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
 687   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 688   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 689   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 690   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 691   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
 692   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 693   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 694   OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
 695                   [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
 696   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
 697                         [nla_parse], [netlink_ext_ack],
 698                         [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
 699
 700   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 701
 702   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 703                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 704   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 705   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 706   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
 707   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
 708   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
 709
 710   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 711
 712   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 713                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 714   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 715                   [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
 716                                    [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
 717   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
 718   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
 719   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
 720                   [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
 721   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
 722                         [gro_receive])
 723
 724   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
 725                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 726   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 727                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 728
 729   OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
 730   OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
 731   OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
 732                   [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
 733   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
 734                         [udp_add_offload], [net],
 735                         [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
 736   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 737                         [nf_defrag_ipv6_enable], [net],
 738                         [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
 739
 740   if cmp -s datapath/linux/kcompat.h.new \
 741             datapath/linux/kcompat.h >/dev/null 2>&1; then
 742     rm datapath/linux/kcompat.h.new
 743   else
 744     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 745   fi
 746 ])
 747
 748 dnl Checks for net/if_packet.h.
 749 AC_DEFUN([OVS_CHECK_IF_PACKET],
 750   [AC_CHECK_HEADER([net/if_packet.h],
 751                    [HAVE_IF_PACKET=yes],
 752                    [HAVE_IF_PACKET=no])
 753    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
 754    if test "$HAVE_IF_PACKET" = yes; then
 755       AC_DEFINE([HAVE_IF_PACKET], [1],
 756                 [Define to 1 if net/if_packet.h is available.])
 757    fi])
 758
 759 dnl Checks for net/if_dl.h.
 760 dnl
 761 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 762 dnl or NetBSD.)
 763 AC_DEFUN([OVS_CHECK_IF_DL],
 764   [AC_CHECK_HEADER([net/if_dl.h],
 765                    [HAVE_IF_DL=yes],
 766                    [HAVE_IF_DL=no])
 767    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 768    if test "$HAVE_IF_DL" = yes; then
 769       AC_DEFINE([HAVE_IF_DL], [1],
 770                 [Define to 1 if net/if_dl.h is available.])
 771
 772       # On these platforms we use libpcap to access network devices.
 773       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 774    fi])
 775
 776 dnl Checks for buggy strtok_r.
 777 dnl
 778 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 779 dnl with optimization that can cause segfaults:
 780 dnl
 781 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 782 AC_DEFUN([OVS_CHECK_STRTOK_R],
 783   [AC_CACHE_CHECK(
 784      [whether strtok_r macro segfaults on some inputs],
 785      [ovs_cv_strtok_r_bug],
 786      [AC_RUN_IFELSE(
 787         [AC_LANG_PROGRAM([#include <stdio.h>
 788                           #include <string.h>
 789                          ],
 790                          [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
 791                            /* Assume bug is present, because relatively minor
 792                               changes in compiler settings (e.g. optimization
 793                               level) can make it crop up. */
 794                            return 1;
 795                            #else
 796                            char string[] = ":::";
 797                            char *save_ptr = (char *) 0xc0ffee;
 798                            char *token1, *token2;
 799                            token1 = strtok_r(string, ":", &save_ptr);
 800                            token2 = strtok_r(NULL, ":", &save_ptr);
 801                            freopen ("/dev/null", "w", stdout);
 802                            printf ("%s %s\n", token1, token2);
 803                            return 0;
 804                            #endif
 805                           ]])],
 806         [ovs_cv_strtok_r_bug=no],
 807         [ovs_cv_strtok_r_bug=yes],
 808         [ovs_cv_strtok_r_bug=yes])])
 809    if test $ovs_cv_strtok_r_bug = yes; then
 810      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 811                [Define if strtok_r macro segfaults on some inputs])
 812    fi
 813 ])
 814
 815 dnl ----------------------------------------------------------------------
 816 dnl These macros are from GNU PSPP, with the following original license:
 817 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 818 dnl This file is free software; the Free Software Foundation
 819 dnl gives unlimited permission to copy and/or distribute it,
 820 dnl with or without modifications, as long as this notice is preserved.
 821
 822 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
 823   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-= ], [__])])dnl
 824   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 825     [ovs_save_CFLAGS="$CFLAGS"
 826      dnl Include -Werror in the compiler options, because without -Werror
 827      dnl clang's GCC-compatible compiler driver does not return a failure
 828      dnl exit status even though it complains about options it does not
 829      dnl understand.
 830      dnl
 831      dnl Also, check stderr as gcc exits with status 0 for options
 832      dnl rejected at getopt level.
 833      dnl    % touch /tmp/a.c
 834      dnl    % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
 835      dnl    gcc: unrecognized option '-Qunused-arguments'
 836      dnl    0
 837      dnl    %
 838      CFLAGS="$CFLAGS $WERROR $1"
 839      AC_COMPILE_IFELSE(
 840        [AC_LANG_SOURCE([int x;])],
 841        [if test -s conftest.err && grep "unrecognized option" conftest.err
 842         then
 843           ovs_cv_name[]=no
 844         else
 845           ovs_cv_name[]=yes
 846         fi],
 847        [ovs_cv_name[]=no])
 848      CFLAGS="$ovs_save_CFLAGS"])
 849   if test $ovs_cv_name = yes; then
 850     m4_if([$2], [], [:], [$2])
 851   else
 852     m4_if([$3], [], [:], [$3])
 853   fi
 854 ])
 855
 856 dnl OVS_CHECK_WERROR
 857 dnl
 858 dnl Check whether the C compiler accepts -Werror.
 859 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
 860 AC_DEFUN([OVS_CHECK_WERROR],
 861   [WERROR=
 862    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
 863
 864 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
 865 dnl Check whether the given C compiler OPTION is accepted.
 866 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
 867 AC_DEFUN([OVS_CHECK_CC_OPTION],
 868   [AC_REQUIRE([OVS_CHECK_WERROR])
 869    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
 870
 871 dnl OVS_ENABLE_OPTION([OPTION])
 872 dnl Check whether the given C compiler OPTION is accepted.
 873 dnl If so, add it to WARNING_FLAGS.
 874 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
 875 AC_DEFUN([OVS_ENABLE_OPTION],
 876   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
 877    AC_SUBST([WARNING_FLAGS])])
 878
 879 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
 880 dnl Check whether the given C compiler OPTION is accepted.
 881 dnl If so, enable the given Automake CONDITIONAL.
 882
 883 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 884 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
 885   [OVS_CHECK_CC_OPTION(
 886     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
 887    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
 888 dnl ----------------------------------------------------------------------
 889
 890 dnl Check for too-old XenServer.
 891 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
 892   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
 893     [if test -e /etc/redhat-release; then
 894        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
 895      fi
 896      if test -z "$ovs_cv_xsversion"; then
 897        ovs_cv_xsversion=none
 898      fi])
 899   case $ovs_cv_xsversion in
 900     none)
 901       ;;
 902
 903     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
 904     [[6-9]]* |                           dnl XenServer 6 or later
 905     5.[[7-9]]* |                         dnl XenServer 5.7 or later
 906     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
 907     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
 908     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
 909       ;;
 910
 911     *)
 912       AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported.  (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
 913       ;;
 914   esac])
 915
 916 dnl OVS_CHECK_SPARSE_TARGET
 917 dnl
 918 dnl The "cgcc" script from "sparse" isn't very good at detecting the
 919 dnl target for which the code is being built.  This helps it out.
 920 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
 921   [AC_CACHE_CHECK(
 922     [target hint for cgcc],
 923     [ac_cv_sparse_target],
 924     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
 925        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
 926        [x86_64-*], [ac_cv_sparse_target=x86_64],
 927        [ac_cv_sparse_target=other])])
 928    AS_CASE([$ac_cv_sparse_target],
 929      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
 930      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
 931      [SPARSEFLAGS= CGCCFLAGS=])
 932    AC_SUBST([SPARSEFLAGS])
 933    AC_SUBST([CGCCFLAGS])])
 934
 935 dnl OVS_SPARSE_EXTRA_INCLUDES
 936 dnl
 937 dnl The cgcc script from "sparse" does not search gcc's default
 938 dnl search path. Get the default search path from GCC and pass
 939 dnl them to sparse.
 940 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
 941     AC_SUBST([SPARSE_EXTRA_INCLUDES],
 942            [`$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 ' ' `] ))
 943
 944 dnl OVS_ENABLE_SPARSE
 945 AC_DEFUN([OVS_ENABLE_SPARSE],
 946   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
 947    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
 948    : ${SPARSE=sparse}
 949    AC_SUBST([SPARSE])
 950    AC_CONFIG_COMMANDS_PRE(
 951      [CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'])])
 952
 953 dnl OVS_PTHREAD_SET_NAME
 954 dnl
 955 dnl This checks for three known variants of pthreads functions for setting
 956 dnl the name of the current thread:
 957 dnl
 958 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
 959 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
 960 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
 961 dnl
 962 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
 963 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
 964 dnl provide to it.
 965 dnl
 966 dnl This macro defines:
 967 dnl
 968 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
 969 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
 970 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
 971 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
 972   [AC_CHECK_FUNCS([pthread_set_name_np])
 973    if test $ac_cv_func_pthread_set_name_np != yes; then
 974      AC_CACHE_CHECK(
 975        [for pthread_setname_np() variant],
 976        [ovs_cv_pthread_setname_np],
 977        [AC_LINK_IFELSE(
 978          [AC_LANG_PROGRAM([#include <pthread.h>
 979   ], [pthread_setname_np(pthread_self(), "name");])],
 980          [ovs_cv_pthread_setname_np=glibc],
 981          [AC_LINK_IFELSE(
 982            [AC_LANG_PROGRAM([#include <pthread.h>
 983 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
 984            [ovs_cv_pthread_setname_np=netbsd],
 985            [ovs_cv_pthread_setname_np=none])])])
 986      case $ovs_cv_pthread_setname_np in # (
 987        glibc)
 988           AC_DEFINE(
 989             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
 990             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
 991           ;; # (
 992        netbsd)
 993           AC_DEFINE(
 994             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
 995             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
 996           ;;
 997      esac
 998    fi])
 999
1000 dnl OVS_CHECK_LINUX_HOST.
1001 dnl
1002 dnl Checks whether we're building for a Linux host, based on the presence of
1003 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
1004 dnl LINUX based on the result.
1005 AC_DEFUN([OVS_CHECK_LINUX_HOST],
1006   [AC_CACHE_CHECK(
1007      [whether __linux__ is defined],
1008      [ovs_cv_linux],
1009      [AC_COMPILE_IFELSE(
1010         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
1011         [ovs_cv_linux=true],
1012         [ovs_cv_linux=false])])
1013    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])