acinclude.m4

   1 # -*- autoconf -*-
   2
   3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019 Nicira, Inc.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at:
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 dnl OVS_ENABLE_WERROR
  18 AC_DEFUN([OVS_ENABLE_WERROR],
  19   [AC_ARG_ENABLE(
  20      [Werror],
  21      [AC_HELP_STRING([--enable-Werror], [Add -Werror to CFLAGS])],
  22      [], [enable_Werror=no])
  23    AC_CONFIG_COMMANDS_PRE(
  24      [if test "X$enable_Werror" = Xyes; then
  25         OVS_CFLAGS="$OVS_CFLAGS -Werror"
  26       fi])
  27
  28    # Unless --enable-Werror is specified, report but do not fail the build
  29    # for errors reported by flake8.
  30    if test "X$enable_Werror" = Xyes; then
  31      FLAKE8_WERROR=
  32    else
  33      FLAKE8_WERROR=-
  34    fi
  35    AC_SUBST([FLAKE8_WERROR])
  36
  37    # If --enable-Werror is specified, fail the build on sparse warnings.
  38    if test "X$enable_Werror" = Xyes; then
  39      SPARSE_WERROR=-Wsparse-error
  40    else
  41      SPARSE_WERROR=
  42    fi
  43    AC_SUBST([SPARSE_WERROR])])
  44
  45 dnl OVS_CHECK_LINUX
  46 dnl
  47 dnl Configure linux kernel source tree
  48 AC_DEFUN([OVS_CHECK_LINUX], [
  49   AC_ARG_WITH([linux],
  50               [AC_HELP_STRING([--with-linux=/path/to/linux],
  51                               [Specify the Linux kernel build directory])])
  52   AC_ARG_WITH([linux-source],
  53               [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
  54                               [Specify the Linux kernel source directory
  55                                (usually figured out automatically from build
  56                                directory)])])
  57
  58   # Deprecated equivalents to --with-linux, --with-linux-source.
  59   AC_ARG_WITH([l26])
  60   AC_ARG_WITH([l26-source])
  61
  62   if test X"$with_linux" != X; then
  63     KBUILD=$with_linux
  64   elif test X"$with_l26" != X; then
  65     KBUILD=$with_l26
  66     AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
  67   else
  68     KBUILD=
  69   fi
  70
  71   if test X"$KBUILD" != X; then
  72     if test X"$with_linux_source" != X; then
  73       KSRC=$with_linux_source
  74     elif test X"$with_l26_source" != X; then
  75       KSRC=$with_l26_source
  76       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
  77     else
  78       KSRC=
  79     fi
  80   elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
  81     AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
  82   fi
  83
  84   if test -n "$KBUILD"; then
  85     KBUILD=`eval echo "$KBUILD"`
  86     case $KBUILD in
  87         /*) ;;
  88         *) KBUILD=`pwd`/$KBUILD ;;
  89     esac
  90
  91     # The build directory is what the user provided.
  92     # Make sure that it exists.
  93     AC_MSG_CHECKING([for Linux build directory])
  94     if test -d "$KBUILD"; then
  95         AC_MSG_RESULT([$KBUILD])
  96         AC_SUBST(KBUILD)
  97     else
  98         AC_MSG_RESULT([no])
  99         AC_ERROR([source dir $KBUILD doesn't exist])
 100     fi
 101
 102     # Debian breaks kernel headers into "source" header and "build" headers.
 103     # We want the source headers, but $KBUILD gives us the "build" headers.
 104     # Use heuristics to find the source headers.
 105     AC_MSG_CHECKING([for Linux source directory])
 106     if test -n "$KSRC"; then
 107       KSRC=`eval echo "$KSRC"`
 108       case $KSRC in
 109           /*) ;;
 110           *) KSRC=`pwd`/$KSRC ;;
 111       esac
 112       if test ! -e $KSRC/include/linux/kernel.h; then
 113         AC_MSG_ERROR([$KSRC is not a kernel source directory])
 114       fi
 115     else
 116       KSRC=$KBUILD
 117       if test ! -e $KSRC/include/linux/kernel.h; then
 118         # Debian kernel build Makefiles tend to include a line of the form:
 119         # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
 120         # First try to extract the source directory from this line.
 121         KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
 122         if test ! -e "$KSRC"/include/linux/kernel.h; then
 123           # Didn't work.  Fall back to name-based heuristics that used to work.
 124           case `echo "$KBUILD" | sed 's,/*$,,'` in # (
 125             */build)
 126               KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
 127               ;; # (
 128             *)
 129               KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
 130               ;;
 131           esac
 132         fi
 133       fi
 134       if test ! -e "$KSRC"/include/linux/kernel.h; then
 135         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
 136       fi
 137     fi
 138     AC_MSG_RESULT([$KSRC])
 139
 140     AC_MSG_CHECKING([for kernel version])
 141     version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
 142     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
 143     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
 144     if test X"$version" = X || test X"$patchlevel" = X; then
 145        AC_ERROR([cannot determine kernel version])
 146     elif test X"$sublevel" = X; then
 147        kversion=$version.$patchlevel
 148     else
 149        kversion=$version.$patchlevel.$sublevel
 150     fi
 151     AC_MSG_RESULT([$kversion])
 152
 153     if test "$version" -ge 5; then
 154        if test "$version" = 5 && test "$patchlevel" -le 0; then
 155           : # Linux 5.x
 156        else
 157           AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 5.0.x is not supported (please refer to the FAQ for advice)])
 158        fi
 159     elif test "$version" = 4; then
 160        : # Linux 4.x
 161     elif test "$version" = 3 && test "$patchlevel" -ge 10; then
 162        : # Linux 3.x
 163     else
 164        AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 3.10 or later is required])
 165     fi
 166     if (test ! -e "$KBUILD"/include/linux/version.h && \
 167         test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
 168        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 169         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 170         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 171     fi
 172     OVS_CHECK_LINUX_COMPAT
 173   fi
 174   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 175 ])
 176
 177 dnl OVS_CHECK_LINUX_TC
 178 dnl
 179 dnl Configure Linux tc compat.
 180 AC_DEFUN([OVS_CHECK_LINUX_TC], [
 181   AC_COMPILE_IFELSE([
 182     AC_LANG_PROGRAM([#include <linux/pkt_cls.h>], [
 183         int x = TCA_FLOWER_KEY_ENC_IP_TTL_MASK;
 184     ])],
 185     [AC_DEFINE([HAVE_TCA_FLOWER_KEY_ENC_IP_TTL_MASK], [1],
 186                [Define to 1 if TCA_FLOWER_KEY_ENC_IP_TTL_MASK is available.])])
 187
 188   AC_COMPILE_IFELSE([
 189     AC_LANG_PROGRAM([#include <linux/tc_act/tc_vlan.h>], [
 190         int x = TCA_VLAN_PUSH_VLAN_PRIORITY;
 191     ])],
 192     [AC_DEFINE([HAVE_TCA_VLAN_PUSH_VLAN_PRIORITY], [1],
 193                [Define to 1 if TCA_VLAN_PUSH_VLAN_PRIORITY is available.])])
 194
 195   AC_COMPILE_IFELSE([
 196     AC_LANG_PROGRAM([#include <linux/tc_act/tc_mpls.h>], [
 197         int x = TCA_MPLS_TTL;
 198     ])],
 199     [AC_DEFINE([HAVE_TCA_MPLS_TTL], [1],
 200                [Define to 1 if HAVE_TCA_MPLS_TTL is available.])])
 201
 202   AC_COMPILE_IFELSE([
 203     AC_LANG_PROGRAM([#include <linux/tc_act/tc_tunnel_key.h>], [
 204         int x = TCA_TUNNEL_KEY_ENC_TTL;
 205     ])],
 206     [AC_DEFINE([HAVE_TCA_TUNNEL_KEY_ENC_TTL], [1],
 207                [Define to 1 if TCA_TUNNEL_KEY_ENC_TTL is available.])])
 208
 209   AC_COMPILE_IFELSE([
 210     AC_LANG_PROGRAM([#include <linux/tc_act/tc_pedit.h>], [
 211         int x = TCA_PEDIT_KEY_EX_HDR_TYPE_UDP;
 212     ])],
 213     [AC_DEFINE([HAVE_TCA_PEDIT_KEY_EX_HDR_TYPE_UDP], [1],
 214                [Define to 1 if TCA_PEDIT_KEY_EX_HDR_TYPE_UDP is available.])])
 215
 216   AC_COMPILE_IFELSE([
 217     AC_LANG_PROGRAM([#include <linux/tc_act/tc_skbedit.h>], [
 218         int x = TCA_SKBEDIT_FLAGS;
 219     ])],
 220     [AC_DEFINE([HAVE_TCA_SKBEDIT_FLAGS], [1],
 221                [Define to 1 if TCA_SKBEDIT_FLAGS is available.])])
 222 ])
 223
 224 dnl OVS_CHECK_LINUX_SCTP_CT
 225 dnl
 226 dnl Checks for kernels which need additional SCTP state
 227 AC_DEFUN([OVS_CHECK_LINUX_SCTP_CT], [
 228   AC_COMPILE_IFELSE([
 229     AC_LANG_PROGRAM([#include <linux/netfilter/nfnetlink.h>
 230 #include <linux/netfilter/nfnetlink_conntrack.h>
 231 #include <linux/netfilter/nf_conntrack_common.h>
 232 #include <linux/netfilter/nf_conntrack_sctp.h>], [
 233         int x = SCTP_CONNTRACK_HEARTBEAT_SENT;
 234     ])],
 235     [AC_DEFINE([HAVE_SCTP_CONNTRACK_HEARTBEATS], [1],
 236                [Define to 1 if SCTP_CONNTRACK_HEARTBEAT_SENT is available.])])
 237 ])
 238
 239 dnl OVS_FIND_DEPENDENCY(FUNCTION, SEARCH_LIBS, NAME_TO_PRINT)
 240 dnl
 241 dnl Check for a function in a library list.
 242 AC_DEFUN([OVS_FIND_DEPENDENCY], [
 243   AC_SEARCH_LIBS([$1], [$2], [], [
 244     AC_MSG_ERROR([unable to find $3, install the dependency package])
 245   ])
 246 ])
 247
 248 dnl OVS_CHECK_LINUX_AF_XDP
 249 dnl
 250 dnl Check both Linux kernel AF_XDP and libbpf support
 251 AC_DEFUN([OVS_CHECK_LINUX_AF_XDP], [
 252   AC_ARG_ENABLE([afxdp],
 253                 [AC_HELP_STRING([--enable-afxdp], [Enable AF-XDP support])],
 254                 [], [enable_afxdp=no])
 255   AC_MSG_CHECKING([whether AF_XDP is enabled])
 256   if test "$enable_afxdp" != yes; then
 257     AC_MSG_RESULT([no])
 258     AF_XDP_ENABLE=false
 259   else
 260     AC_MSG_RESULT([yes])
 261     AF_XDP_ENABLE=true
 262
 263     AC_CHECK_HEADER([bpf/libbpf.h], [],
 264       [AC_MSG_ERROR([unable to find bpf/libbpf.h for AF_XDP support])])
 265
 266     AC_CHECK_HEADER([linux/if_xdp.h], [],
 267       [AC_MSG_ERROR([unable to find linux/if_xdp.h for AF_XDP support])])
 268
 269     AC_CHECK_HEADER([bpf/xsk.h], [],
 270       [AC_MSG_ERROR([unable to find bpf/xsk.h for AF_XDP support])])
 271
 272     AC_CHECK_FUNCS([pthread_spin_lock], [],
 273       [AC_MSG_ERROR([unable to find pthread_spin_lock for AF_XDP support])])
 274
 275     AC_DEFINE([HAVE_AF_XDP], [1],
 276               [Define to 1 if AF_XDP support is available and enabled.])
 277     LIBBPF_LDADD=" -lbpf -lelf"
 278     AC_SUBST([LIBBPF_LDADD])
 279   fi
 280   AM_CONDITIONAL([HAVE_AF_XDP], test "$AF_XDP_ENABLE" = true)
 281 ])
 282
 283 dnl OVS_CHECK_DPDK
 284 dnl
 285 dnl Configure DPDK source tree
 286 AC_DEFUN([OVS_CHECK_DPDK], [
 287   AC_ARG_WITH([dpdk],
 288               [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
 289                               [Specify the DPDK build directory])],
 290               [have_dpdk=true])
 291
 292   AC_MSG_CHECKING([whether dpdk datapath is enabled])
 293   if test "$have_dpdk" != true || test "$with_dpdk" = no; then
 294     AC_MSG_RESULT([no])
 295     DPDKLIB_FOUND=false
 296   else
 297     AC_MSG_RESULT([yes])
 298     case "$with_dpdk" in
 299       yes)
 300         DPDK_AUTO_DISCOVER="true"
 301         PKG_CHECK_MODULES_STATIC([DPDK], [libdpdk], [
 302             DPDK_INCLUDE="$DPDK_CFLAGS"
 303             DPDK_LIB="$DPDK_LIBS"], [
 304             DPDK_INCLUDE="-I/usr/local/include/dpdk -I/usr/include/dpdk"
 305             DPDK_LIB="-ldpdk"])
 306         ;;
 307       *)
 308         DPDK_AUTO_DISCOVER="false"
 309         DPDK_INCLUDE_PATH="$with_dpdk/include"
 310         # If 'with_dpdk' is passed install directory, point to headers
 311         # installed in $DESTDIR/$prefix/include/dpdk
 312         if test -e "$DPDK_INCLUDE_PATH/rte_config.h"; then
 313            DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH"
 314         elif test -e "$DPDK_INCLUDE_PATH/dpdk/rte_config.h"; then
 315            DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH/dpdk"
 316         fi
 317         DPDK_LIB_DIR="$with_dpdk/lib"
 318         DPDK_LIB="-ldpdk"
 319         ;;
 320     esac
 321
 322     ovs_save_CFLAGS="$CFLAGS"
 323     ovs_save_LDFLAGS="$LDFLAGS"
 324     CFLAGS="$CFLAGS $DPDK_INCLUDE"
 325     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 326       LDFLAGS="$LDFLAGS -L${DPDK_LIB_DIR}"
 327     fi
 328
 329     AC_CHECK_HEADERS([rte_config.h], [], [
 330       AC_MSG_ERROR([unable to find rte_config.h in $with_dpdk])
 331     ], [AC_INCLUDES_DEFAULT])
 332
 333     AC_CHECK_DECLS([RTE_LIBRTE_VHOST_NUMA, RTE_EAL_NUMA_AWARE_HUGEPAGES], [
 334       OVS_FIND_DEPENDENCY([get_mempolicy], [numa], [libnuma])
 335     ], [], [[#include <rte_config.h>]])
 336
 337     AC_CHECK_DECL([RTE_LIBRTE_VHOST_NUMA], [
 338       AC_DEFINE([VHOST_NUMA], [1], [NUMA Aware vHost support detected in DPDK.])
 339     ], [], [[#include <rte_config.h>]])
 340
 341     AC_CHECK_DECL([RTE_LIBRTE_PMD_PCAP], [
 342       OVS_FIND_DEPENDENCY([pcap_dump], [pcap], [libpcap])
 343       AC_CHECK_DECL([RTE_LIBRTE_PDUMP], [
 344         AC_DEFINE([DPDK_PDUMP], [1], [DPDK pdump enabled in OVS.])
 345       ], [], [[#include <rte_config.h>]])
 346     ], [], [[#include <rte_config.h>]])
 347
 348     AC_CHECK_DECL([RTE_LIBRTE_MLX5_PMD], [dnl found
 349       OVS_FIND_DEPENDENCY([mnl_attr_put], [mnl], [libmnl])
 350       AC_CHECK_DECL([RTE_LIBRTE_MLX5_DLOPEN_DEPS], [], [dnl not found
 351         OVS_FIND_DEPENDENCY([mlx5dv_create_wq], [mlx5], [libmlx5])
 352         OVS_FIND_DEPENDENCY([verbs_init_cq], [ibverbs], [libibverbs])
 353       ], [[#include <rte_config.h>]])
 354     ], [], [[#include <rte_config.h>]])
 355
 356     AC_CHECK_DECL([RTE_LIBRTE_MLX4_PMD], [dnl found
 357       AC_CHECK_DECL([RTE_LIBRTE_MLX4_DLOPEN_DEPS], [], [dnl not found
 358         OVS_FIND_DEPENDENCY([mlx4dv_init_obj], [mlx4], [libmlx4])
 359         OVS_FIND_DEPENDENCY([verbs_init_cq], [ibverbs], [libibverbs])
 360       ], [[#include <rte_config.h>]])
 361     ], [], [[#include <rte_config.h>]])
 362
 363     # DPDK uses dlopen to load plugins.
 364     OVS_FIND_DEPENDENCY([dlopen], [dl], [libdl])
 365
 366     AC_MSG_CHECKING([whether linking with dpdk works])
 367     LIBS="$DPDK_LIB $LIBS"
 368     AC_LINK_IFELSE(
 369       [AC_LANG_PROGRAM([#include <rte_config.h>
 370                         #include <rte_eal.h>],
 371                        [int rte_argc; char ** rte_argv;
 372                         rte_eal_init(rte_argc, rte_argv);])],
 373       [AC_MSG_RESULT([yes])
 374        DPDKLIB_FOUND=true],
 375       [AC_MSG_RESULT([no])
 376        if test "$DPDK_AUTO_DISCOVER" = "true"; then
 377          AC_MSG_ERROR(m4_normalize([
 378             Could not find DPDK library in default search path, Use --with-dpdk
 379             to specify the DPDK library installed in non-standard location]))
 380        else
 381          AC_MSG_ERROR([Could not find DPDK libraries in $DPDK_LIB_DIR])
 382        fi
 383       ])
 384
 385     CFLAGS="$ovs_save_CFLAGS"
 386     LDFLAGS="$ovs_save_LDFLAGS"
 387     if test "$DPDK_AUTO_DISCOVER" = "false"; then
 388       OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
 389     fi
 390     OVS_CFLAGS="$OVS_CFLAGS $DPDK_INCLUDE"
 391     OVS_ENABLE_OPTION([-mssse3])
 392
 393     # DPDK pmd drivers are not linked unless --whole-archive is used.
 394     #
 395     # This happens because the rest of the DPDK code doesn't use any symbol in
 396     # the pmd driver objects, and the drivers register themselves using an
 397     # __attribute__((constructor)) function.
 398     #
 399     # These options are specified inside a single -Wl directive to prevent
 400     # autotools from reordering them.
 401     #
 402     # OTOH newer versions of dpdk pkg-config (generated with Meson)
 403     # will already have flagged just the right set of libs with
 404     # --whole-archive - in those cases do not wrap it once more.
 405     case "$DPDK_LIB" in
 406       *whole-archive*) DPDK_vswitchd_LDFLAGS=$DPDK_LIB;;
 407       *) DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
 408     esac
 409     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 410     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 411   fi
 412
 413   AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
 414 ])
 415
 416 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 417 dnl
 418 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 419 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 420 dnl <REGEX> translated to uppercase.
 421 AC_DEFUN([OVS_GREP_IFELSE], [
 422   AC_MSG_CHECKING([whether $2 matches in $1])
 423   if test -f $1; then
 424     grep '$2' $1 >/dev/null 2>&1
 425     status=$?
 426     case $status in
 427       0)
 428         AC_MSG_RESULT([yes])
 429         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 430         ;;
 431       1)
 432         AC_MSG_RESULT([no])
 433         $4
 434         ;;
 435       *)
 436         AC_MSG_ERROR([grep exited with status $status])
 437         ;;
 438     esac
 439   else
 440     AC_MSG_RESULT([file not found])
 441     $4
 442   fi
 443 ])
 444
 445 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 446 dnl
 447 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
 448 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
 449 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 450 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
 451 dnl translated to uppercase.
 452 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
 453   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 454   if test -f $1; then
 455     awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
 456     status=$?
 457     case $status in
 458       0)
 459         AC_MSG_RESULT([yes])
 460         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 461         ;;
 462       1)
 463         AC_MSG_RESULT([no])
 464         $5
 465         ;;
 466       *)
 467         AC_MSG_ERROR([grep exited with status $status])
 468         ;;
 469     esac
 470   else
 471     AC_MSG_RESULT([file not found])
 472     $5
 473   fi
 474 ])
 475
 476 dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
 477 dnl
 478 dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
 479 dnl the function signature starting from the line matching FUNCTION
 480 dnl and ending with the line containing the closing parenthesis.  If
 481 dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH.  If
 482 dnl IF-MATCH is empty then it defines to
 483 dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
 484 dnl <REGEX> translated to uppercase.
 485 AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
 486   AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
 487   if test -f $1; then
 488     awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
 489     status=$?
 490     case $status in
 491       0)
 492         AC_MSG_RESULT([yes])
 493         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 494         ;;
 495       1)
 496         AC_MSG_RESULT([no])
 497         $5
 498         ;;
 499       *)
 500         AC_MSG_ERROR([grep exited with status $status])
 501         ;;
 502     esac
 503   else
 504     AC_MSG_RESULT([file not found])
 505     $5
 506   fi
 507 ])
 508
 509 dnl OVS_DEFINE(NAME)
 510 dnl
 511 dnl Defines NAME to 1 in kcompat.h.
 512 AC_DEFUN([OVS_DEFINE], [
 513   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 514 ])
 515
 516 dnl OVS_CHECK_LINUX_COMPAT
 517 dnl
 518 dnl Runs various Autoconf checks on the Linux kernel source in
 519 dnl the directory in $KBUILD.
 520 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 521   rm -f datapath/linux/kcompat.h.new
 522   mkdir -p datapath/linux
 523   : > datapath/linux/kcompat.h.new
 524
 525   echo '#include <linux/version.h>
 526 #ifndef RHEL_RELEASE_CODE
 527 #define RHEL_RELEASE_CODE 0
 528 #define RHEL_RELEASE_VERSION(a, b) 0
 529 #endif' >> datapath/linux/kcompat.h.new
 530
 531   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 532                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 533
 534   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6_get_cookie],
 535                   [OVS_DEFINE([HAVE_RT6_GET_COOKIE])])
 536
 537   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
 538                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
 539   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
 540
 541   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 542   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 543   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
 544
 545   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [static_branch_unlikely(],
 546                   [OVS_DEFINE([HAVE_UPSTREAM_STATIC_KEY])])
 547   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [DEFINE_STATIC_KEY_FALSE],
 548                   [OVS_DEFINE([HAVE_DEFINE_STATIC_KEY])])
 549
 550   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 551   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 552
 553   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
 554   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
 555   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 556   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 557   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 558   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_hwaccel_clear_tag])
 559
 560   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 561   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
 562   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 563                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 564   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
 565                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
 566
 567   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
 568                   [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
 569   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
 570                   [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
 571   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 572                         [ip_do_fragment], [net],
 573                         [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
 574   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 575                         [ip_local_out], [net],
 576                         [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
 577
 578   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 579
 580   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
 581                   [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
 582   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
 583   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
 584                   [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
 585   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
 586                   [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
 587   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
 588   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
 589   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 590                         [frags_work])
 591   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 592                         [rwlock])
 593   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
 594                         [list_evictor])
 595   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
 596   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
 597                         [sub_frag_mem_limit], [struct.netns_frags],
 598                         [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
 599   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
 600                   [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
 601   OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
 602                   [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
 603
 604   dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
 605   dnl OVS does not really need ipv6 label field, but its presence signifies that
 606   dnl the stack has all required ipv6 support.
 607   dnl OVS also does not need dst_cache But this dependency allows us to write
 608   dnl much cleaner code.
 609
 610   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
 611                         [label],
 612                         [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
 613                                          [iptunnel_pull_offloads],
 614                         [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 615                         [OVS_GREP_IFELSE([$KSRC/include/net/erspan.h], [erspan_md2],
 616                                          [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])])
 617
 618   OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 619                   [OVS_DEFINE([USE_BUILTIN_DST_CACHE])])
 620   OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
 621                   [OVS_DEFINE([MPLS_HEADER_IS_L3])])
 622   OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
 623                   [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
 624   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
 625   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 626   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 627   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 628   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
 629   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 630   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_gso_error_unwind])
 631   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 632   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
 633   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
 634                   [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
 635   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
 636   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
 637   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_udp_tunnel_add])
 638   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 639   dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
 640   dnl So check type of tstats.
 641   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
 642                   [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
 643   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
 644                   [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
 645   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_csum_hwoffload_help])
 646   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
 647   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
 648                   [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
 649   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
 650   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
 651   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 652                         [extended])
 653   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 654                         [netdev_master_upper_dev_link], [upper_priv],
 655                         [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
 656   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 657                   [netdev_master_upper_dev_link_rh],
 658                   [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_RH])])
 659
 660   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 661                         [max_mtu])
 662   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops_extended],
 663                         [ndo_change_mtu], [OVS_DEFINE([HAVE_RHEL7_MAX_MTU])])
 664   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 665                         [dev_change_flags], [extack],
 666                         [OVS_DEFINE([HAVE_DEV_CHANGE_FLAGS_TAKES_EXTACK])])
 667
 668   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
 669   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state],
 670                         [struct net ], [OVS_DEFINE([HAVE_NF_HOOK_STATE_NET])])
 671   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
 672   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
 673                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
 674   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
 675                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
 676   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 677                         [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
 678   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [NFPROTO_INET])
 679   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [CONFIG_NF_NAT_NEEDED])
 680
 681
 682   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
 683                         [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 684
 685   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 686                         [nf_conn], [struct timer_list[[ \t]]*timeout],
 687                         [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
 688   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 689                   [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
 690
 691   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 692                   [nf_ct_tmpl_alloc], [nf_conntrack_zone],
 693                   [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
 694   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 695                   [nf_ct_get_tuplepr], [struct.net],
 696                   [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
 697   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 698                   [nf_ct_set])
 699   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 700                   [nf_ct_is_untracked])
 701   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 702                   [nf_ct_invert_tuplepr])
 703   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
 704                   [nf_ct_zone_init])
 705   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
 706                   [net_ns_get])
 707   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 708                   [nf_connlabels_get])
 709   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 710                   [nf_connlabels_get], [int bit],
 711                   [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
 712   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 713                         [nf_conn_labels], [words])
 714   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
 715   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
 716   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_range2])
 717   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_packet],
 718                   [OVS_DEFINE([HAVE_UPSTREAM_NF_NAT])])
 719   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
 720   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h], [nf_conncount_gc_list],
 721                   [OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h],
 722                                    [int nf_conncount_add],
 723                                    [], [OVS_DEFINE([HAVE_UPSTREAM_NF_CONNCOUNT])])])
 724   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h], [nf_ct_set_timeout])
 725   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h], [struct nf_ct_timeout],
 726                   [OVS_DEFINE([HAVE_NF_CT_TIMEOUT])])
 727   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h],
 728                         [\(*nf_ct_timeout_find_get_hook\)], [net],
 729                         [OVS_DEFINE([HAVE_NF_CT_TIMEOUT_FIND_GET_HOOK_NET])])
 730
 731   OVS_GREP_IFELSE([$KSRC/include/linux/random.h],
 732                   [prandom_u32[[\(]]],
 733                   [OVS_DEFINE([HAVE_PRANDOM_U32])])
 734   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
 735
 736   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
 737   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
 738   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
 739                   [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
 740   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
 741
 742   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 743                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 744                                    [rcu_read_lock_held])])
 745   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 746   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [net_rwsem])
 747   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h],
 748                         [rtnl_create_link], [extack],
 749                         [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_TAKES_EXTACK])])
 750   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [nf_reset_ct])
 751
 752   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 753   # is necessary because some versions of this header remove the
 754   # member but retain the kerneldoc comment that describes it (which
 755   # starts with @).  The brackets must be doubled because of m4
 756   # quoting rules.
 757   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 758                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 759   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
 760   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
 761   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
 762   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
 763   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
 764   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 765   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 766                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 767   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 768                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 769   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 770                   [skb_copy_from_linear_data_offset])
 771   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 772                   [skb_reset_tail_pointer])
 773   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 774   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 775                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 776   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 777   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 778   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 779   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 780   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 781   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 782   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 783   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
 784                   [OVS_DEFINE([HAVE_SKB_GET_HASH])])
 785   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 786   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 787                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 788   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
 789                   [OVS_DEFINE([HAVE_L4_RXHASH])])
 790   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 791   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 792   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
 793   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 794   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
 795   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
 796   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
 797   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
 798   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_put_zero])
 799
 800   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 801                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 802   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 803                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 804   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 805                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 806
 807   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 808   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 809
 810   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
 811   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
 812
 813   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 814   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 815   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 816   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 817                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 818   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 819   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
 820                   [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
 821   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_validate_flags])
 822   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
 823                         [genl_notify], [net],
 824                         [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
 825
 826
 827   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
 828                         [genl_multicast_group], [id])
 829   OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
 830
 831   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 832   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 833   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 834   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
 835   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
 836   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
 837                   [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
 838   OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
 839                   [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
 840
 841   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
 842   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 843   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 844   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 845   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 846   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
 847   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 848   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 849   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_nest_start_noflag])
 850   OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
 851                   [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
 852   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
 853                         [nla_parse], [netlink_ext_ack],
 854                         [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
 855
 856   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 857
 858   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 859   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 860   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
 861   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
 862   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
 863
 864   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/dst_metadata.h],
 865                         [metadata_dst_alloc], [metadata_type])
 866
 867   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 868
 869   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 870                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 871   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 872                   [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
 873                                    [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
 874   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
 875   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
 876   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
 877                   [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
 878   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
 879                         [gro_receive])
 880
 881   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
 882                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 883   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 884                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 885
 886   OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
 887   OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
 888   OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
 889                   [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
 890   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
 891                         [udp_add_offload], [net],
 892                         [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
 893   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 894                         [nf_defrag_ipv6_enable], [net],
 895                         [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
 896   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [family_list],
 897                         [OVS_DEFINE([HAVE_GENL_FAMILY_LIST])])
 898   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 899                         [needs_free_netdev],
 900                         [OVS_DEFINE([HAVE_NEEDS_FREE_NETDEV])])
 901   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_dev], [cfg],
 902                         [OVS_DEFINE([HAVE_VXLAN_DEV_CFG])])
 903   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
 904                   [nf_conntrack_helper_put],
 905                   [OVS_DEFINE(HAVE_NF_CONNTRACK_HELPER_PUT)])
 906   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],[[[[:space:]]]SKB_GSO_UDP[[[:space:]]]],
 907                   [OVS_DEFINE([HAVE_SKB_GSO_UDP])])
 908   OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
 909                   [OVS_DEFINE([HAVE_DST_NOCACHE])])
 910   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
 911                         [extack],
 912                   [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
 913   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 914                         [list],
 915                         [OVS_DEFINE([HAVE_LIST_IN_NF_HOOK_OPS])])
 916   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netfilter/nf_conntrack_common.h],
 917                   [IP_CT_UNTRACKED])
 918   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 919                         [netdev_master_upper_dev_link], [extack],
 920                         [OVS_DEFINE([HAVE_UPPER_DEV_LINK_EXTACK])])
 921   OVS_GREP_IFELSE([$KSRC/include/linux/compiler_types.h],
 922                   [__LINUX_COMPILER_TYPES_H],
 923                   [OVS_DEFINE([HAVE_LINUX_COMPILER_TYPES_H])])
 924   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 925                   [ktime_get_ts64],
 926                   [OVS_DEFINE([HAVE_KTIME_GET_TS64])])
 927   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h],
 928                   [EXPORT_SYMBOL_GPL(peernet2id_alloc)],
 929                   [OVS_DEFINE([HAVE_PEERNET2ID_ALLOC])])
 930   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
 931                   [ktime_get_ns],
 932                   [OVS_DEFINE([HAVE_KTIME_GET_NS])])
 933   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h],
 934                   frag_percpu_counter_batch[],
 935                   [OVS_DEFINE([HAVE_FRAG_PERCPU_COUNTER_BATCH])])
 936   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 937                   [null_compute_pseudo],
 938                   [OVS_DEFINE([HAVE_NULL_COMPUTE_PSEUDO])])
 939   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 940                   [__skb_checksum_convert],
 941                   [OVS_DEFINE([HAVE_SKB_CHECKSUM_CONVERT])])
 942   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 943                         [max_mtu],
 944                         [OVS_DEFINE([HAVE_NET_DEVICE_MAX_MTU])])
 945   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip6_tunnel.h], [__ip6_tnl_parm],
 946                         [erspan_ver],
 947                         [OVS_DEFINE([HAVE_IP6_TNL_PARM_ERSPAN_VER])])
 948   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 949                   [SKB_GSO_IPXIP6],
 950                   [OVS_DEFINE([HAVE_SKB_GSO_IPXIP6])])
 951   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ipv6.h],
 952                         [ip6_make_flowlabel], [fl6],
 953                         [OVS_DEFINE([HAVE_IP6_MAKE_FLOWLABEL_FL6])])
 954   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ipv6.h], [netns_sysctl_ipv6],
 955                         [auto_flowlabels],
 956                         [OVS_DEFINE([HAVE_NETNS_SYSCTL_IPV6_AUTO_FLOWLABELS])])
 957   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 958                   [netif_keep_dst],
 959                   [OVS_DEFINE([HAVE_NETIF_KEEP_DST])])
 960   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 961                         [ndo_get_iflink],
 962                         [OVS_DEFINE([HAVE_NDO_GET_IFLINK])])
 963   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 964                   [skb_set_inner_ipproto],
 965                   [OVS_DEFINE([HAVE_SKB_SET_INNER_IPPROTO])])
 966   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 967                   [tunnel_encap_types],
 968                   [OVS_DEFINE([HAVE_TUNNEL_ENCAP_TYPES])])
 969   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 970                   [IFLA_IPTUN_ENCAP_TYPE],
 971                   [OVS_DEFINE([HAVE_IFLA_IPTUN_ENCAP_TYPE])])
 972   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 973                   [IFLA_IPTUN_COLLECT_METADATA],
 974                   [OVS_DEFINE([HAVE_IFLA_IPTUN_COLLECT_METADATA])])
 975   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 976                   [IFLA_GRE_ENCAP_DPORT])
 977   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 978                   [IFLA_GRE_COLLECT_METADATA])
 979   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 980                   [IFLA_GRE_IGNORE_DF])
 981   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 982                   [IFLA_GRE_FWMARK])
 983   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 984                   [IFLA_GRE_ERSPAN_INDEX])
 985   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 986                   [IFLA_GRE_ERSPAN_HWID])
 987   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
 988                   [IFLA_IPTUN_FWMARK])
 989   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
 990                         [csum_valid],
 991                         [OVS_DEFINE([HAVE_SKBUFF_CSUM_VALID])])
 992   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
 993                         [vlan_present],
 994                         [OVS_DEFINE([HAVE_SKBUFF_VLAN_PRESENT])])
 995   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 996                   [skb_checksum_simple_validate])
 997   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 998                   [void.*ndo_get_stats64],
 999                   [OVS_DEFINE([HAVE_VOID_NDO_GET_STATS64])])
1000   OVS_GREP_IFELSE([$KSRC/include/linux/timer.h], [init_timer_deferrable],
1001                   [OVS_DEFINE([HAVE_INIT_TIMER_DEFERRABLE])])
1002   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip_tunnels.h],
1003                         [ip_tunnel_info_opts_set], [flags],
1004                         [OVS_DEFINE([HAVE_IP_TUNNEL_INFO_OPTS_SET_FLAGS])])
1005   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
1006                         [rnd],
1007                         [OVS_DEFINE([HAVE_INET_FRAGS_RND])])
1008   OVS_GREP_IFELSE([$KSRC/include/linux/overflow.h], [__LINUX_OVERFLOW_H],
1009                   [OVS_DEFINE([HAVE_OVERFLOW_H])])
1010   OVS_GREP_IFELSE([$KSRC/include/linux/overflow.h], [struct_size],
1011                   [OVS_DEFINE([HAVE_STRUCT_SIZE])])
1012   OVS_GREP_IFELSE([$KSRC/include/linux/mm.h], [kvmalloc_array],
1013                   [OVS_DEFINE([HAVE_KVMALLOC_ARRAY])])
1014   OVS_GREP_IFELSE([$KSRC/include/linux/mm.h], [kvmalloc_node],
1015                   [OVS_DEFINE([HAVE_KVMALLOC_NODE])])
1016   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
1017                   [nf_conntrack_l3proto],
1018                   [OVS_DEFINE([HAVE_NF_CONNTRACK_L3PROATO_H])])
1019   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_core.h],
1020                         [nf_conntrack_in], [nf_hook_state],
1021                         [OVS_DEFINE([HAVE_NF_CONNTRACK_IN_TAKES_NF_HOOK_STATE])])
1022   OVS_GREP_IFELSE([$KSRC/include/net/ipv6_frag.h], [IP6_DEFRAG_CONNTRACK_IN],
1023                   [OVS_DEFINE([HAVE_IPV6_FRAG_H])])
1024   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
1025                         [nf_ct_helper_ext_add], [nf_conntrack_helper],
1026                         [OVS_DEFINE([HAVE_NF_CT_HELPER_EXT_ADD_TAKES_HELPER])])
1027   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_calc_hlen],
1028                   [OVS_DEFINE([HAVE_GRE_CALC_HLEN])])
1029   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [ip_gre_calc_hlen],
1030                   [OVS_DEFINE([HAVE_IP_GRE_CALC_HLEN])])
1031   OVS_GREP_IFELSE([$KSRC/include/linux/rbtree.h], [rb_link_node_rcu],
1032                   [OVS_DEFINE([HAVE_RBTREE_RB_LINK_NODE_RCU])])
1033
1034   if cmp -s datapath/linux/kcompat.h.new \
1035             datapath/linux/kcompat.h >/dev/null 2>&1; then
1036     rm datapath/linux/kcompat.h.new
1037   else
1038     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
1039   fi
1040 ])
1041
1042 dnl Checks for net/if_dl.h.
1043 dnl
1044 dnl (We use this as a proxy for checking whether we're building on FreeBSD
1045 dnl or NetBSD.)
1046 AC_DEFUN([OVS_CHECK_IF_DL],
1047   [AC_CHECK_HEADER([net/if_dl.h],
1048                    [HAVE_IF_DL=yes],
1049                    [HAVE_IF_DL=no])
1050    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
1051    if test "$HAVE_IF_DL" = yes; then
1052       AC_DEFINE([HAVE_IF_DL], [1],
1053                 [Define to 1 if net/if_dl.h is available.])
1054
1055       # On these platforms we use libpcap to access network devices.
1056       AC_SEARCH_LIBS([pcap_open_live], [pcap])
1057    fi])
1058
1059 dnl Checks for buggy strtok_r.
1060 dnl
1061 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
1062 dnl with optimization that can cause segfaults:
1063 dnl
1064 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
1065 AC_DEFUN([OVS_CHECK_STRTOK_R],
1066   [AC_CACHE_CHECK(
1067      [whether strtok_r macro segfaults on some inputs],
1068      [ovs_cv_strtok_r_bug],
1069      [AC_RUN_IFELSE(
1070         [AC_LANG_PROGRAM([#include <stdio.h>
1071                           #include <string.h>
1072                          ],
1073                          [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
1074                            /* Assume bug is present, because relatively minor
1075                               changes in compiler settings (e.g. optimization
1076                               level) can make it crop up. */
1077                            return 1;
1078                            #else
1079                            char string[] = ":::";
1080                            char *save_ptr = (char *) 0xc0ffee;
1081                            char *token1, *token2;
1082                            token1 = strtok_r(string, ":", &save_ptr);
1083                            token2 = strtok_r(NULL, ":", &save_ptr);
1084                            freopen ("/dev/null", "w", stdout);
1085                            printf ("%s %s\n", token1, token2);
1086                            return 0;
1087                            #endif
1088                           ]])],
1089         [ovs_cv_strtok_r_bug=no],
1090         [ovs_cv_strtok_r_bug=yes],
1091         [ovs_cv_strtok_r_bug=yes])])
1092    if test $ovs_cv_strtok_r_bug = yes; then
1093      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
1094                [Define if strtok_r macro segfaults on some inputs])
1095    fi
1096 ])
1097
1098 dnl ----------------------------------------------------------------------
1099 dnl These macros are from GNU PSPP, with the following original license:
1100 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
1101 dnl This file is free software; the Free Software Foundation
1102 dnl gives unlimited permission to copy and/or distribute it,
1103 dnl with or without modifications, as long as this notice is preserved.
1104
1105 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
1106   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-= ], [__])])dnl
1107   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
1108     [ovs_save_CFLAGS="$CFLAGS"
1109      dnl Include -Werror in the compiler options, because without -Werror
1110      dnl clang's GCC-compatible compiler driver does not return a failure
1111      dnl exit status even though it complains about options it does not
1112      dnl understand.
1113      dnl
1114      dnl Also, check stderr as gcc exits with status 0 for options
1115      dnl rejected at getopt level.
1116      dnl    % touch /tmp/a.c
1117      dnl    % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
1118      dnl    gcc: unrecognized option '-Qunused-arguments'
1119      dnl    0
1120      dnl    %
1121      dnl
1122      dnl In addition, GCC does not complain about a -Wno-<foo> option that
1123      dnl it does not understand, unless it has another error to report, so
1124      dnl instead of testing for -Wno-<foo>, test for the positive version.
1125      CFLAGS="$CFLAGS $WERROR m4_bpatsubst([$1], [-Wno-], [-W])"
1126      AC_COMPILE_IFELSE(
1127        [AC_LANG_SOURCE([int x;])],
1128        [if test -s conftest.err && grep "unrecognized option" conftest.err
1129         then
1130           ovs_cv_name[]=no
1131         else
1132           ovs_cv_name[]=yes
1133         fi],
1134        [ovs_cv_name[]=no])
1135      CFLAGS="$ovs_save_CFLAGS"])
1136   if test $ovs_cv_name = yes; then
1137     m4_if([$2], [], [:], [$2])
1138   else
1139     m4_if([$3], [], [:], [$3])
1140   fi
1141 ])
1142
1143 dnl OVS_CHECK_WERROR
1144 dnl
1145 dnl Check whether the C compiler accepts -Werror.
1146 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
1147 AC_DEFUN([OVS_CHECK_WERROR],
1148   [WERROR=
1149    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
1150
1151 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
1152 dnl Check whether the given C compiler OPTION is accepted.
1153 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
1154 AC_DEFUN([OVS_CHECK_CC_OPTION],
1155   [AC_REQUIRE([OVS_CHECK_WERROR])
1156    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
1157
1158 dnl OVS_ENABLE_OPTION([OPTION])
1159 dnl Check whether the given C compiler OPTION is accepted.
1160 dnl If so, add it to WARNING_FLAGS.
1161 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
1162 AC_DEFUN([OVS_ENABLE_OPTION],
1163   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
1164    AC_SUBST([WARNING_FLAGS])])
1165
1166 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
1167 dnl Check whether the given C compiler OPTION is accepted.
1168 dnl If so, enable the given Automake CONDITIONAL.
1169
1170 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
1171 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
1172   [OVS_CHECK_CC_OPTION(
1173     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
1174    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
1175 dnl ----------------------------------------------------------------------
1176
1177 dnl Check for too-old XenServer.
1178 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
1179   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
1180     [if test -e /etc/redhat-release; then
1181        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
1182      fi
1183      if test -z "$ovs_cv_xsversion"; then
1184        ovs_cv_xsversion=none
1185      fi])
1186   case $ovs_cv_xsversion in
1187     none)
1188       ;;
1189
1190     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
1191     [[6-9]]* |                           dnl XenServer 6 or later
1192     5.[[7-9]]* |                         dnl XenServer 5.7 or later
1193     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
1194     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
1195     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
1196       ;;
1197
1198     *)
1199       AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported.  (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
1200       ;;
1201   esac])
1202
1203 dnl OVS_CHECK_SPARSE_TARGET
1204 dnl
1205 dnl The "cgcc" script from "sparse" isn't very good at detecting the
1206 dnl target for which the code is being built.  This helps it out.
1207 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
1208   [AC_CACHE_CHECK(
1209     [target hint for cgcc],
1210     [ac_cv_sparse_target],
1211     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
1212        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
1213        [x86_64-*], [ac_cv_sparse_target=x86_64],
1214        [ac_cv_sparse_target=other])])
1215    AS_CASE([$ac_cv_sparse_target],
1216      [x86], [SPARSEFLAGS= CGCCFLAGS="-target=i86 -target=host_os_specs"],
1217      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS="-target=x86_64 -target=host_os_specs"],
1218      [SPARSEFLAGS= CGCCFLAGS=])
1219
1220    dnl Get the default defines for vector instructions from compiler to
1221    dnl allow "sparse" correctly check the same code that will be built.
1222    dnl Required for checking DPDK headers.
1223    AC_MSG_CHECKING([vector options for cgcc])
1224    VECTOR=$($CC -dM -E - < /dev/null | grep -E "MMX|SSE|AVX" | \
1225             cut -c 9- | sed 's/ /=/' | sed 's/^/-D/' | tr '\n' ' ')
1226    AC_MSG_RESULT([$VECTOR])
1227    CGCCFLAGS="$CGCCFLAGS $VECTOR"
1228
1229    AC_SUBST([SPARSEFLAGS])
1230    AC_SUBST([CGCCFLAGS])])
1231
1232 dnl OVS_SPARSE_EXTRA_INCLUDES
1233 dnl
1234 dnl The cgcc script from "sparse" does not search gcc's default
1235 dnl search path. Get the default search path from GCC and pass
1236 dnl them to sparse.
1237 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
1238     AC_SUBST([SPARSE_EXTRA_INCLUDES],
1239            [`$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 ' ' `] ))
1240
1241 dnl OVS_ENABLE_SPARSE
1242 AC_DEFUN([OVS_ENABLE_SPARSE],
1243   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
1244    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
1245    : ${SPARSE=sparse}
1246    AC_SUBST([SPARSE])
1247    AC_CONFIG_COMMANDS_PRE(
1248      [CC='$(if $(C:0=),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) $(SPARSE_WERROR) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'])
1249
1250    AC_ARG_ENABLE(
1251      [sparse],
1252      [AC_HELP_STRING([--enable-sparse], [Run "sparse" by default])],
1253      [], [enable_sparse=no])
1254    AM_CONDITIONAL([ENABLE_SPARSE_BY_DEFAULT], [test $enable_sparse = yes])])
1255
1256 dnl OVS_CTAGS_IDENTIFIERS
1257 dnl
1258 dnl ctags ignores symbols with extras identifiers. This builds a list of
1259 dnl specially handled identifiers to be ignored.
1260 AC_DEFUN([OVS_CTAGS_IDENTIFIERS],
1261     AC_SUBST([OVS_CTAGS_IDENTIFIERS_LIST],
1262            [`printf %s '-I "'; sed -n 's/^#define \(OVS_[A-Z_]\+\)(\.\.\.)$/\1+/p' ${srcdir}/include/openvswitch/compiler.h  | tr \\\n ' ' ; printf '"'`] ))
1263
1264 dnl OVS_PTHREAD_SET_NAME
1265 dnl
1266 dnl This checks for three known variants of pthreads functions for setting
1267 dnl the name of the current thread:
1268 dnl
1269 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
1270 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
1271 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
1272 dnl
1273 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
1274 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
1275 dnl provide to it.
1276 dnl
1277 dnl This macro defines:
1278 dnl
1279 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
1280 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
1281 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
1282 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
1283   [AC_CHECK_FUNCS([pthread_set_name_np])
1284    if test $ac_cv_func_pthread_set_name_np != yes; then
1285      AC_CACHE_CHECK(
1286        [for pthread_setname_np() variant],
1287        [ovs_cv_pthread_setname_np],
1288        [AC_LINK_IFELSE(
1289          [AC_LANG_PROGRAM([#include <pthread.h>
1290   ], [pthread_setname_np(pthread_self(), "name");])],
1291          [ovs_cv_pthread_setname_np=glibc],
1292          [AC_LINK_IFELSE(
1293            [AC_LANG_PROGRAM([#include <pthread.h>
1294 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
1295            [ovs_cv_pthread_setname_np=netbsd],
1296            [ovs_cv_pthread_setname_np=none])])])
1297      case $ovs_cv_pthread_setname_np in # (
1298        glibc)
1299           AC_DEFINE(
1300             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
1301             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
1302           ;; # (
1303        netbsd)
1304           AC_DEFINE(
1305             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
1306             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
1307           ;;
1308      esac
1309    fi])
1310
1311 dnl OVS_CHECK_LINUX_HOST.
1312 dnl
1313 dnl Checks whether we're building for a Linux host, based on the presence of
1314 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
1315 dnl LINUX based on the result.
1316 AC_DEFUN([OVS_CHECK_LINUX_HOST],
1317   [AC_CACHE_CHECK(
1318      [whether __linux__ is defined],
1319      [ovs_cv_linux],
1320      [AC_COMPILE_IFELSE(
1321         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
1322         [ovs_cv_linux=true],
1323         [ovs_cv_linux=false])])
1324    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])