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 Set OVS DPCLS Autovalidator as default subtable search at compile time?
  18 dnl This enables automatically running all unit tests with all DPCLS
  19 dnl implementations.
  20 AC_DEFUN([OVS_CHECK_DPCLS_AUTOVALIDATOR], [
  21   AC_ARG_ENABLE([autovalidator],
  22                 [AC_HELP_STRING([--enable-autovalidator], [Enable DPCLS autovalidator as default subtable search implementation.])],
  23                 [autovalidator=yes],[autovalidator=no])
  24   AC_MSG_CHECKING([whether DPCLS Autovalidator is default implementation])
  25   if test "$autovalidator" != yes; then
  26     AC_MSG_RESULT([no])
  27   else
  28     OVS_CFLAGS="$OVS_CFLAGS -DDPCLS_AUTOVALIDATOR_DEFAULT"
  29     AC_MSG_RESULT([yes])
  30   fi
  31 ])
  32
  33 dnl OVS_ENABLE_WERROR
  34 AC_DEFUN([OVS_ENABLE_WERROR],
  35   [AC_ARG_ENABLE(
  36      [Werror],
  37      [AC_HELP_STRING([--enable-Werror], [Add -Werror to CFLAGS])],
  38      [], [enable_Werror=no])
  39    AC_CONFIG_COMMANDS_PRE(
  40      [if test "X$enable_Werror" = Xyes; then
  41         OVS_CFLAGS="$OVS_CFLAGS -Werror"
  42       fi])
  43
  44    # Unless --enable-Werror is specified, report but do not fail the build
  45    # for errors reported by flake8.
  46    if test "X$enable_Werror" = Xyes; then
  47      FLAKE8_WERROR=
  48    else
  49      FLAKE8_WERROR=-
  50    fi
  51    AC_SUBST([FLAKE8_WERROR])
  52
  53    # If --enable-Werror is specified, fail the build on sparse warnings.
  54    if test "X$enable_Werror" = Xyes; then
  55      SPARSE_WERROR=-Wsparse-error
  56    else
  57      SPARSE_WERROR=
  58    fi
  59    AC_SUBST([SPARSE_WERROR])])
  60
  61 dnl OVS_CHECK_LINUX
  62 dnl
  63 dnl Configure linux kernel source tree
  64 AC_DEFUN([OVS_CHECK_LINUX], [
  65   AC_ARG_WITH([linux],
  66               [AC_HELP_STRING([--with-linux=/path/to/linux],
  67                               [Specify the Linux kernel build directory])])
  68   AC_ARG_WITH([linux-source],
  69               [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
  70                               [Specify the Linux kernel source directory
  71                                (usually figured out automatically from build
  72                                directory)])])
  73
  74   # Deprecated equivalents to --with-linux, --with-linux-source.
  75   AC_ARG_WITH([l26])
  76   AC_ARG_WITH([l26-source])
  77
  78   if test X"$with_linux" != X; then
  79     KBUILD=$with_linux
  80     AC_MSG_WARN([--with-linux is deprecated and kernel support is limited to 5.8 and below])
  81   elif test X"$with_l26" != X; then
  82     KBUILD=$with_l26
  83     AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
  84   else
  85     KBUILD=
  86   fi
  87
  88   if test X"$KBUILD" != X; then
  89     if test X"$with_linux_source" != X; then
  90       KSRC=$with_linux_source
  91     elif test X"$with_l26_source" != X; then
  92       KSRC=$with_l26_source
  93       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
  94     else
  95       KSRC=
  96     fi
  97   elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
  98     AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
  99   fi
 100
 101   if test -n "$KBUILD"; then
 102     KBUILD=`eval echo "$KBUILD"`
 103     case $KBUILD in
 104         /*) ;;
 105         *) KBUILD=`pwd`/$KBUILD ;;
 106     esac
 107
 108     # The build directory is what the user provided.
 109     # Make sure that it exists.
 110     AC_MSG_CHECKING([for Linux build directory])
 111     if test -d "$KBUILD"; then
 112         AC_MSG_RESULT([$KBUILD])
 113         AC_SUBST(KBUILD)
 114     else
 115         AC_MSG_RESULT([no])
 116         AC_ERROR([source dir $KBUILD doesn't exist])
 117     fi
 118
 119     # Debian breaks kernel headers into "source" header and "build" headers.
 120     # We want the source headers, but $KBUILD gives us the "build" headers.
 121     # Use heuristics to find the source headers.
 122     AC_MSG_CHECKING([for Linux source directory])
 123     if test -n "$KSRC"; then
 124       KSRC=`eval echo "$KSRC"`
 125       case $KSRC in
 126           /*) ;;
 127           *) KSRC=`pwd`/$KSRC ;;
 128       esac
 129       if test ! -e $KSRC/include/linux/kernel.h; then
 130         AC_MSG_ERROR([$KSRC is not a kernel source directory])
 131       fi
 132     else
 133       KSRC=$KBUILD
 134       if test ! -e $KSRC/include/linux/kernel.h; then
 135         # Debian kernel build Makefiles tend to include a line of the form:
 136         # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
 137         # First try to extract the source directory from this line.
 138         KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
 139         if test ! -e "$KSRC"/include/linux/kernel.h; then
 140           # Didn't work.  Fall back to name-based heuristics that used to work.
 141           case `echo "$KBUILD" | sed 's,/*$,,'` in # (
 142             */build)
 143               KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
 144               ;; # (
 145             *)
 146               KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
 147               ;;
 148           esac
 149         fi
 150       fi
 151       if test ! -e "$KSRC"/include/linux/kernel.h; then
 152         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
 153       fi
 154     fi
 155     AC_MSG_RESULT([$KSRC])
 156
 157     AC_MSG_CHECKING([for kernel version])
 158     version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
 159     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
 160     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
 161     if test X"$version" = X || test X"$patchlevel" = X; then
 162        AC_ERROR([cannot determine kernel version])
 163     elif test X"$sublevel" = X; then
 164        kversion=$version.$patchlevel
 165     else
 166        kversion=$version.$patchlevel.$sublevel
 167     fi
 168     AC_MSG_RESULT([$kversion])
 169
 170     if test "$version" -ge 5; then
 171        if test "$version" = 5 && test "$patchlevel" -le 8; then
 172           : # Linux 5.x
 173        else
 174           AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 5.8.x is not supported (please refer to the FAQ for advice)])
 175        fi
 176     elif test "$version" = 4; then
 177        : # Linux 4.x
 178     elif test "$version" = 3 && test "$patchlevel" -ge 10; then
 179        : # Linux 3.x
 180     else
 181        AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 3.10 or later is required])
 182     fi
 183     if (test ! -e "$KBUILD"/include/linux/version.h && \
 184         test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
 185        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 186         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 187         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 188     fi
 189     OVS_CHECK_LINUX_COMPAT
 190   fi
 191   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 192 ])
 193
 194 dnl OVS_CHECK_LINUX_NETLINK
 195 dnl
 196 dnl Configure Linux netlink compat.
 197 AC_DEFUN([OVS_CHECK_LINUX_NETLINK], [
 198   AC_COMPILE_IFELSE([
 199     AC_LANG_PROGRAM([#include <linux/netlink.h>], [
 200         struct nla_bitfield32 x =  { 0 };
 201     ])],
 202     [AC_DEFINE([HAVE_NLA_BITFIELD32], [1],
 203     [Define to 1 if struct nla_bitfield32 is available.])])
 204 ])
 205
 206 dnl OVS_CHECK_LINUX_TC
 207 dnl
 208 dnl Configure Linux tc compat.
 209 AC_DEFUN([OVS_CHECK_LINUX_TC], [
 210   AC_COMPILE_IFELSE([
 211     AC_LANG_PROGRAM([#include <linux/pkt_cls.h>], [
 212         int x = TCA_ACT_FLAGS;
 213     ])],
 214     [AC_DEFINE([HAVE_TCA_ACT_FLAGS], [1],
 215                [Define to 1 if TCA_ACT_FLAGS is available.])])
 216
 217   AC_CHECK_MEMBERS([struct tcf_t.firstuse], [], [], [#include <linux/pkt_cls.h>])
 218
 219   AC_COMPILE_IFELSE([
 220     AC_LANG_PROGRAM([#include <linux/tc_act/tc_vlan.h>], [
 221         int x = TCA_VLAN_PUSH_VLAN_PRIORITY;
 222     ])],
 223     [AC_DEFINE([HAVE_TCA_VLAN_PUSH_VLAN_PRIORITY], [1],
 224                [Define to 1 if TCA_VLAN_PUSH_VLAN_PRIORITY is available.])])
 225
 226   AC_COMPILE_IFELSE([
 227     AC_LANG_PROGRAM([#include <linux/tc_act/tc_mpls.h>], [
 228         int x = TCA_MPLS_TTL;
 229     ])],
 230     [AC_DEFINE([HAVE_TCA_MPLS_TTL], [1],
 231                [Define to 1 if HAVE_TCA_MPLS_TTL is available.])])
 232
 233   AC_COMPILE_IFELSE([
 234     AC_LANG_PROGRAM([#include <linux/tc_act/tc_tunnel_key.h>], [
 235         int x = TCA_TUNNEL_KEY_ENC_TTL;
 236     ])],
 237     [AC_DEFINE([HAVE_TCA_TUNNEL_KEY_ENC_TTL], [1],
 238                [Define to 1 if TCA_TUNNEL_KEY_ENC_TTL is available.])])
 239
 240   AC_COMPILE_IFELSE([
 241     AC_LANG_PROGRAM([#include <linux/tc_act/tc_pedit.h>], [
 242         int x = TCA_PEDIT_KEY_EX_HDR_TYPE_UDP;
 243     ])],
 244     [AC_DEFINE([HAVE_TCA_PEDIT_KEY_EX_HDR_TYPE_UDP], [1],
 245                [Define to 1 if TCA_PEDIT_KEY_EX_HDR_TYPE_UDP is available.])])
 246
 247   AC_COMPILE_IFELSE([
 248     AC_LANG_PROGRAM([#include <linux/tc_act/tc_skbedit.h>], [
 249         int x = TCA_SKBEDIT_FLAGS;
 250     ])],
 251     [AC_DEFINE([HAVE_TCA_SKBEDIT_FLAGS], [1],
 252                [Define to 1 if TCA_SKBEDIT_FLAGS is available.])])
 253 ])
 254
 255 dnl OVS_CHECK_LINUX_SCTP_CT
 256 dnl
 257 dnl Checks for kernels which need additional SCTP state
 258 AC_DEFUN([OVS_CHECK_LINUX_SCTP_CT], [
 259   AC_COMPILE_IFELSE([
 260     AC_LANG_PROGRAM([#include <linux/netfilter/nfnetlink.h>
 261 #include <linux/netfilter/nfnetlink_conntrack.h>
 262 #include <linux/netfilter/nf_conntrack_common.h>
 263 #include <linux/netfilter/nf_conntrack_sctp.h>], [
 264         int x = SCTP_CONNTRACK_HEARTBEAT_SENT;
 265     ])],
 266     [AC_DEFINE([HAVE_SCTP_CONNTRACK_HEARTBEATS], [1],
 267                [Define to 1 if SCTP_CONNTRACK_HEARTBEAT_SENT is available.])])
 268 ])
 269
 270 dnl OVS_CHECK_LINUX_VIRTIO_TYPES
 271 dnl
 272 dnl Checks for kernels that need virtio_types definition.
 273 AC_DEFUN([OVS_CHECK_LINUX_VIRTIO_TYPES], [
 274   AC_COMPILE_IFELSE([
 275     AC_LANG_PROGRAM([#include <linux/virtio_types.h>], [
 276         __virtio16 x =  0;
 277     ])],
 278     [AC_DEFINE([HAVE_VIRTIO_TYPES], [1],
 279     [Define to 1 if __virtio16 is available.])])
 280 ])
 281
 282 dnl OVS_FIND_DEPENDENCY(FUNCTION, SEARCH_LIBS, NAME_TO_PRINT)
 283 dnl
 284 dnl Check for a function in a library list.
 285 AC_DEFUN([OVS_FIND_DEPENDENCY], [
 286   AC_SEARCH_LIBS([$1], [$2], [], [
 287     AC_MSG_ERROR([unable to find $3, install the dependency package])
 288   ])
 289 ])
 290
 291 dnl OVS_CHECK_LINUX_AF_XDP
 292 dnl
 293 dnl Check both Linux kernel AF_XDP and libbpf support
 294 AC_DEFUN([OVS_CHECK_LINUX_AF_XDP], [
 295   AC_ARG_ENABLE([afxdp],
 296                 [AC_HELP_STRING([--enable-afxdp], [Enable AF-XDP support])],
 297                 [], [enable_afxdp=no])
 298   AC_MSG_CHECKING([whether AF_XDP is enabled])
 299   if test "$enable_afxdp" != yes; then
 300     AC_MSG_RESULT([no])
 301     AF_XDP_ENABLE=false
 302   else
 303     AC_MSG_RESULT([yes])
 304     AF_XDP_ENABLE=true
 305
 306     AC_CHECK_HEADER([bpf/libbpf.h], [],
 307       [AC_MSG_ERROR([unable to find bpf/libbpf.h for AF_XDP support])])
 308
 309     AC_CHECK_HEADER([linux/if_xdp.h], [],
 310       [AC_MSG_ERROR([unable to find linux/if_xdp.h for AF_XDP support])])
 311
 312     AC_CHECK_HEADER([bpf/xsk.h], [],
 313       [AC_MSG_ERROR([unable to find bpf/xsk.h for AF_XDP support])])
 314
 315     AC_CHECK_FUNCS([pthread_spin_lock], [],
 316       [AC_MSG_ERROR([unable to find pthread_spin_lock for AF_XDP support])])
 317
 318     OVS_FIND_DEPENDENCY([numa_alloc_onnode], [numa], [libnuma])
 319
 320     AC_DEFINE([HAVE_AF_XDP], [1],
 321               [Define to 1 if AF_XDP support is available and enabled.])
 322     LIBBPF_LDADD=" -lbpf -lelf"
 323     AC_SUBST([LIBBPF_LDADD])
 324
 325     AC_CHECK_DECL([xsk_ring_prod__needs_wakeup], [
 326       AC_DEFINE([HAVE_XDP_NEED_WAKEUP], [1],
 327         [XDP need wakeup support detected in xsk.h.])
 328     ], [], [[#include <bpf/xsk.h>]])
 329   fi
 330   AM_CONDITIONAL([HAVE_AF_XDP], test "$AF_XDP_ENABLE" = true)
 331 ])
 332
 333 dnl OVS_CHECK_DPDK
 334 dnl
 335 dnl Configure DPDK source tree
 336 AC_DEFUN([OVS_CHECK_DPDK], [
 337   AC_ARG_WITH([dpdk],
 338               [AC_HELP_STRING([--with-dpdk=static|shared|yes],
 339                               [Specify "static" or "shared" depending on the
 340                               DPDK libraries to use])],
 341               [have_dpdk=true])
 342
 343   AC_MSG_CHECKING([whether dpdk is enabled])
 344   if test "$have_dpdk" != true || test "$with_dpdk" = no; then
 345     AC_MSG_RESULT([no])
 346     DPDKLIB_FOUND=false
 347   else
 348     AC_MSG_RESULT([yes])
 349     case "$with_dpdk" in
 350       "shared")
 351           PKG_CHECK_MODULES([DPDK], [libdpdk], [
 352               DPDK_INCLUDE="$DPDK_CFLAGS"
 353               DPDK_LIB="$DPDK_LIBS"])
 354               ;;
 355       "static" | "yes")
 356           PKG_CHECK_MODULES_STATIC([DPDK], [libdpdk], [
 357               DPDK_INCLUDE="$DPDK_CFLAGS"
 358               DPDK_LIB="$DPDK_LIBS"])
 359
 360           dnl Statically linked private DPDK objects of form
 361           dnl -l:file.a must be positioned between
 362           dnl --whole-archive ... --no-whole-archive linker parameters.
 363           dnl Old pkg-config versions misplace --no-whole-archive parameter
 364           dnl and put it next to --whole-archive.
 365           AC_MSG_CHECKING([for faulty pkg-config version])
 366           echo "$DPDK_LIB" | grep -q 'whole-archive.*l:lib.*no-whole-archive'
 367           status=$?
 368           case $status in
 369             0)
 370               AC_MSG_RESULT([no])
 371               ;;
 372             1)
 373               AC_MSG_RESULT([yes])
 374               AC_MSG_ERROR([Please upgrade pkg-config])
 375               ;;
 376             *)
 377               AC_MSG_ERROR([grep exited with status $status])
 378               ;;
 379           esac
 380     esac
 381
 382     ovs_save_CFLAGS="$CFLAGS"
 383     ovs_save_LDFLAGS="$LDFLAGS"
 384     CFLAGS="$CFLAGS $DPDK_INCLUDE"
 385
 386     AC_CHECK_HEADERS([rte_config.h], [], [
 387       AC_MSG_ERROR([unable to find rte_config.h in $with_dpdk])
 388     ], [AC_INCLUDES_DEFAULT])
 389
 390     AC_CHECK_DECLS([RTE_LIBRTE_VHOST_NUMA, RTE_EAL_NUMA_AWARE_HUGEPAGES], [
 391       OVS_FIND_DEPENDENCY([get_mempolicy], [numa], [libnuma])
 392     ], [], [[#include <rte_config.h>]])
 393
 394     AC_CHECK_DECL([RTE_LIBRTE_PMD_PCAP], [
 395       OVS_FIND_DEPENDENCY([pcap_dump_close], [pcap], [libpcap])
 396     ], [], [[#include <rte_config.h>]])
 397
 398     AC_CHECK_DECL([RTE_LIBRTE_PMD_AF_XDP], [
 399       LIBBPF_LDADD="-lbpf"
 400     ], [], [[#include <rte_config.h>]])
 401
 402     AC_CHECK_DECL([RTE_LIBRTE_VHOST_NUMA], [
 403       AC_DEFINE([VHOST_NUMA], [1], [NUMA Aware vHost support detected in DPDK.])
 404     ], [], [[#include <rte_config.h>]])
 405
 406     AC_CHECK_DECL([RTE_LIBRTE_MLX5_PMD], [dnl found
 407       AC_CHECK_DECL([RTE_IBVERBS_LINK_DLOPEN], [], [dnl not found
 408         OVS_FIND_DEPENDENCY([mlx5dv_create_wq], [mlx5], [libmlx5])
 409         OVS_FIND_DEPENDENCY([verbs_init_cq], [ibverbs], [libibverbs])
 410       ], [[#include <rte_config.h>]])
 411     ], [], [[#include <rte_config.h>]])
 412
 413     AC_CHECK_DECL([RTE_LIBRTE_MLX4_PMD], [dnl found
 414       AC_CHECK_DECL([RTE_IBVERBS_LINK_DLOPEN], [], [dnl not found
 415         OVS_FIND_DEPENDENCY([mlx4dv_init_obj], [mlx4], [libmlx4])
 416         OVS_FIND_DEPENDENCY([verbs_init_cq], [ibverbs], [libibverbs])
 417       ], [[#include <rte_config.h>]])
 418     ], [], [[#include <rte_config.h>]])
 419
 420     # DPDK uses dlopen to load plugins.
 421     OVS_FIND_DEPENDENCY([dlopen], [dl], [libdl])
 422
 423     AC_MSG_CHECKING([whether linking with dpdk works])
 424     LIBS="$DPDK_LIB $LIBS"
 425     AC_LINK_IFELSE(
 426       [AC_LANG_PROGRAM([#include <rte_config.h>
 427                         #include <rte_eal.h>],
 428                        [int rte_argc; char ** rte_argv;
 429                         rte_eal_init(rte_argc, rte_argv);])],
 430       [AC_MSG_RESULT([yes])
 431        DPDKLIB_FOUND=true],
 432       [AC_MSG_RESULT([no])
 433        AC_MSG_ERROR(m4_normalize([
 434           Could not find DPDK library in default search path, update
 435           PKG_CONFIG_PATH for pkg-config to find the .pc file in
 436           non-standard location]))
 437       ])
 438
 439     CFLAGS="$ovs_save_CFLAGS"
 440     LDFLAGS="$ovs_save_LDFLAGS"
 441     # Stripping out possible instruction set specific configuration that DPDK
 442     # forces in pkg-config since this could override user-specified options.
 443     # It's enough to have -mssse3 to build with DPDK headers.
 444     DPDK_INCLUDE=$(echo "$DPDK_INCLUDE" | sed 's/-march=[[^ ]]*//g')
 445     # Also stripping out '-mno-avx512f'.  Support for AVX512 will be disabled
 446     # if OVS will detect that it's broken.  OVS could be built with a
 447     # completely different toolchain that correctly supports AVX512, flags
 448     # forced by DPDK only breaks our feature detection mechanism and leads to
 449     # build failures: https://github.com/openvswitch/ovs-issues/issues/201
 450     DPDK_INCLUDE=$(echo "$DPDK_INCLUDE" | sed 's/-mno-avx512f//g')
 451     OVS_CFLAGS="$OVS_CFLAGS $DPDK_INCLUDE"
 452     OVS_ENABLE_OPTION([-mssse3])
 453
 454     # DPDK pmd drivers are not linked unless --whole-archive is used.
 455     #
 456     # This happens because the rest of the DPDK code doesn't use any symbol in
 457     # the pmd driver objects, and the drivers register themselves using an
 458     # __attribute__((constructor)) function.
 459     # Wrap the DPDK libraries inside a single -Wl directive
 460     # after comma separation to prevent autotools from reordering them.
 461     DPDK_vswitchd_LDFLAGS=$(echo "$DPDK_LIB"| tr -s ' ' ',' | sed 's/-Wl,//g')
 462     # Replace -pthread with -lpthread for LD and remove the last extra comma.
 463     DPDK_vswitchd_LDFLAGS=$(echo "$DPDK_vswitchd_LDFLAGS"| sed 's/,$//' | \
 464                             sed 's/-pthread/-lpthread/g')
 465     # Prepend "-Wl,".
 466     DPDK_vswitchd_LDFLAGS="-Wl,$DPDK_vswitchd_LDFLAGS"
 467
 468     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 469     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 470   fi
 471
 472   AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
 473 ])
 474
 475 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 476 dnl
 477 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 478 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 479 dnl <REGEX> translated to uppercase.
 480 AC_DEFUN([OVS_GREP_IFELSE], [
 481   AC_MSG_CHECKING([whether $2 matches in $1])
 482   if test -f $1; then
 483     grep '$2' $1 >/dev/null 2>&1
 484     status=$?
 485     case $status in
 486       0)
 487         AC_MSG_RESULT([yes])
 488         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 489         ;;
 490       1)
 491         AC_MSG_RESULT([no])
 492         $4
 493         ;;
 494       *)
 495         AC_MSG_ERROR([grep exited with status $status])
 496         ;;
 497     esac
 498   else
 499     AC_MSG_RESULT([file not found])
 500     $4
 501   fi
 502 ])
 503
 504 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 505 dnl
 506 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
 507 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
 508 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 509 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
 510 dnl translated to uppercase.
 511 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
 512   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 513   if test -f $1; then
 514     awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
 515     status=$?
 516     case $status in
 517       0)
 518         AC_MSG_RESULT([yes])
 519         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 520         ;;
 521       1)
 522         AC_MSG_RESULT([no])
 523         $5
 524         ;;
 525       *)
 526         AC_MSG_ERROR([grep exited with status $status])
 527         ;;
 528     esac
 529   else
 530     AC_MSG_RESULT([file not found])
 531     $5
 532   fi
 533 ])
 534
 535 dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
 536 dnl
 537 dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
 538 dnl the function signature starting from the line matching FUNCTION
 539 dnl and ending with the line containing the closing parenthesis.  If
 540 dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH.  If
 541 dnl IF-MATCH is empty then it defines to
 542 dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
 543 dnl <REGEX> translated to uppercase.
 544 AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
 545   AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
 546   if test -f $1; then
 547     awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
 548     status=$?
 549     case $status in
 550       0)
 551         AC_MSG_RESULT([yes])
 552         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 553         ;;
 554       1)
 555         AC_MSG_RESULT([no])
 556         $5
 557         ;;
 558       *)
 559         AC_MSG_ERROR([grep exited with status $status])
 560         ;;
 561     esac
 562   else
 563     AC_MSG_RESULT([file not found])
 564     $5
 565   fi
 566 ])
 567
 568 dnl OVS_FIND_OP_PARAM_IFELSE(FILE, OP, REGEX, [IF-MATCH], [IF-NO-MATCH])
 569 dnl
 570 dnl Looks for OP in FILE. If it is found, greps for REGEX within the
 571 dnl OP definition. If this is successful, runs IF-MATCH, otherwise
 572 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 573 dnl OVS_DEFINE(HAVE_<OP>_WITH_<REGEX>), with <OP> and <REGEX>
 574 dnl translated to uppercase.
 575 AC_DEFUN([OVS_FIND_OP_PARAM_IFELSE], [
 576   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 577   if test -f $1; then
 578     awk '/$2[[ \t\n]]*\)\(/,/;/' $1 2>/dev/null | grep '$3' >/dev/null
 579     status=$?
 580     case $status in
 581       0)
 582         AC_MSG_RESULT([yes])
 583         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 584         ;;
 585       1)
 586         AC_MSG_RESULT([no])
 587         $5
 588         ;;
 589       *)
 590         AC_MSG_ERROR([grep exited with status $status])
 591         ;;
 592     esac
 593   else
 594     AC_MSG_RESULT([file not found])
 595     $5
 596   fi
 597 ])
 598
 599 dnl OVS_DEFINE(NAME)
 600 dnl
 601 dnl Defines NAME to 1 in kcompat.h.
 602 AC_DEFUN([OVS_DEFINE], [
 603   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 604 ])
 605
 606 dnl OVS_CHECK_LINUX_COMPAT
 607 dnl
 608 dnl Runs various Autoconf checks on the Linux kernel source in
 609 dnl the directory in $KBUILD.
 610 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 611   rm -f datapath/linux/kcompat.h.new
 612   mkdir -p datapath/linux
 613   : > datapath/linux/kcompat.h.new
 614
 615   echo '#include <linux/version.h>
 616 #ifndef RHEL_RELEASE_CODE
 617 #define RHEL_RELEASE_CODE 0
 618 #define RHEL_RELEASE_VERSION(a, b) 0
 619 #endif' >> datapath/linux/kcompat.h.new
 620
 621   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 622                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 623
 624   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6_get_cookie],
 625                   [OVS_DEFINE([HAVE_RT6_GET_COOKIE])])
 626
 627   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub],
 628                         [dst_entry])
 629   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
 630                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
 631   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup_flow.*net],
 632                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_FLOW_NET])])
 633   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
 634   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup_flow])
 635
 636   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 637   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 638   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
 639
 640   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [static_branch_unlikely(],
 641                   [OVS_DEFINE([HAVE_UPSTREAM_STATIC_KEY])])
 642   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h], [DEFINE_STATIC_KEY_FALSE],
 643                   [OVS_DEFINE([HAVE_DEFINE_STATIC_KEY])])
 644   OVS_GREP_IFELSE([$KSRC/include/linux/jump_label.h],
 645                   [DECLARE_STATIC_KEY_FALSE],
 646                   [OVS_DEFINE([HAVE_DECLARE_STATIC_KEY])])
 647
 648   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 649   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 650
 651   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
 652   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
 653   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 654   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 655   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 656   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_hwaccel_clear_tag])
 657
 658   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 659   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
 660   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 661                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 662   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
 663                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
 664
 665   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
 666                   [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
 667   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
 668                   [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
 669   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 670                         [ip_do_fragment], [net],
 671                         [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
 672   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
 673                         [ip_local_out], [net],
 674                         [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
 675
 676   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 677
 678   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
 679                   [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
 680   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
 681   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
 682                   [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
 683   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
 684                   [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
 685   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
 686   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
 687   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 688                         [frags_work])
 689   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 690                         [rwlock])
 691   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
 692                         [list_evictor])
 693   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
 694   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
 695                         [sub_frag_mem_limit], [struct.netns_frags],
 696                         [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
 697   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
 698                   [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
 699   OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
 700                   [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
 701
 702   dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
 703   dnl OVS does not really need ipv6 label field, but its presence signifies that
 704   dnl the stack has all required ipv6 support.
 705   dnl OVS also does not need dst_cache But this dependency allows us to write
 706   dnl much cleaner code.
 707
 708   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
 709                         [label],
 710                         [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
 711                                          [iptunnel_pull_offloads],
 712                         [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 713                         [OVS_GREP_IFELSE([$KSRC/include/net/erspan.h], [erspan_md2],
 714                                          [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])])
 715
 716   OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
 717                   [OVS_DEFINE([USE_BUILTIN_DST_CACHE])])
 718   OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
 719                   [OVS_DEFINE([MPLS_HEADER_IS_L3])])
 720   OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
 721                   [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
 722   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
 723   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 724   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 725   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 726   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
 727   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 728   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_gso_error_unwind])
 729   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 730   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
 731   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
 732                   [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
 733   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
 734   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
 735   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_udp_tunnel_add])
 736   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 737   dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
 738   dnl So check type of tstats.
 739   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
 740                   [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
 741   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
 742                   [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
 743   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_csum_hwoffload_help])
 744   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
 745   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
 746                   [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
 747   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
 748   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
 749   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
 750                         [extended])
 751   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 752                         [netdev_master_upper_dev_link], [upper_priv],
 753                         [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
 754   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
 755                   [netdev_master_upper_dev_link_rh],
 756                   [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_RH])])
 757
 758   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 759                         [max_mtu])
 760   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops_extended],
 761                         [ndo_change_mtu], [OVS_DEFINE([HAVE_RHEL7_MAX_MTU])])
 762   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
 763                         [dev_change_flags], [extack],
 764                         [OVS_DEFINE([HAVE_DEV_CHANGE_FLAGS_TAKES_EXTACK])])
 765
 766   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
 767   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state],
 768                         [struct net ], [OVS_DEFINE([HAVE_NF_HOOK_STATE_NET])])
 769   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
 770   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
 771                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
 772   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
 773                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
 774   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
 775                         [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
 776   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [NFPROTO_INET])
 777   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [CONFIG_NF_NAT_NEEDED])
 778
 779
 780   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
 781                         [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 782
 783   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 784                         [nf_conn], [struct timer_list[[ \t]]*timeout],
 785                         [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
 786   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 787                   [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
 788
 789   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 790                   [nf_ct_tmpl_alloc], [nf_conntrack_zone],
 791                   [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
 792   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 793                   [nf_ct_get_tuplepr], [struct.net],
 794                   [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
 795   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 796                   [nf_ct_set])
 797   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 798                   [nf_ct_is_untracked])
 799   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 800                   [nf_ct_invert_tuplepr])
 801   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
 802                   [nf_ct_zone_init])
 803   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
 804                   [net_ns_get])
 805   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 806                   [nf_connlabels_get])
 807   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 808                   [nf_connlabels_get], [int bit],
 809                   [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
 810   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 811                         [nf_conn_labels], [words])
 812   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
 813   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
 814   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_range2])
 815   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_packet],
 816                   [OVS_DEFINE([HAVE_UPSTREAM_NF_NAT])])
 817   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
 818   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h], [nf_conncount_gc_list],
 819                   [OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_count.h],
 820                                    [int nf_conncount_add],
 821                                    [], [OVS_DEFINE([HAVE_UPSTREAM_NF_CONNCOUNT])])])
 822   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h], [nf_ct_set_timeout])
 823   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h], [struct nf_ct_timeout],
 824                   [OVS_DEFINE([HAVE_NF_CT_TIMEOUT])])
 825   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_timeout.h],
 826                         [\(*nf_ct_timeout_find_get_hook\)], [net],
 827                         [OVS_DEFINE([HAVE_NF_CT_TIMEOUT_FIND_GET_HOOK_NET])])
 828
 829   OVS_GREP_IFELSE([$KSRC/include/linux/random.h],
 830                   [prandom_u32[[\(]]],
 831                   [OVS_DEFINE([HAVE_PRANDOM_U32])])
 832   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
 833   OVS_GREP_IFELSE([$KSRC/include/linux/prandom.h],
 834                   [prandom_u32[[\(]]],
 835                   [OVS_DEFINE([HAVE_PRANDOM_U32])])
 836   OVS_GREP_IFELSE([$KSRC/include/linux/prandom.h], [prandom_u32_max])
 837
 838   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
 839   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
 840   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
 841                   [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
 842   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
 843
 844   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 845                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 846                                    [rcu_read_lock_held])])
 847   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 848   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [net_rwsem])
 849   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h],
 850                         [rtnl_create_link], [extack],
 851                         [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_TAKES_EXTACK])])
 852   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [nf_reset_ct])
 853
 854   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 855   # is necessary because some versions of this header remove the
 856   # member but retain the kerneldoc comment that describes it (which
 857   # starts with @).  The brackets must be doubled because of m4
 858   # quoting rules.
 859   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 860                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 861   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
 862   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
 863   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
 864   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
 865   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
 866   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 867   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 868                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 869   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 870                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 871   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 872                   [skb_copy_from_linear_data_offset])
 873   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 874                   [skb_reset_tail_pointer])
 875   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 876   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 877                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 878   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 879   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 880   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 881   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 882   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 883   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 884   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 885   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
 886                   [OVS_DEFINE([HAVE_SKB_GET_HASH])])
 887   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 888   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 889                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 890   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 891   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 892   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
 893   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 894   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
 895   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
 896   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
 897   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
 898   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_put_zero])
 899
 900   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 901                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 902   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 903                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 904
 905   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 906   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 907
 908   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
 909   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
 910
 911   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 912   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 913   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 914   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 915                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 916   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 917   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
 918                   [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
 919   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_validate_flags])
 920   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
 921                         [genl_notify], [net],
 922                         [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
 923
 924
 925   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
 926                         [genl_multicast_group], [id])
 927   OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
 928
 929   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 930   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 931   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 932   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
 933   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
 934   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
 935                   [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
 936   OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
 937                   [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
 938
 939   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
 940   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 941   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 942   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 943   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 944   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
 945   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 946   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 947   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_nest_start_noflag])
 948   OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
 949                   [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
 950   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
 951                         [nla_parse], [netlink_ext_ack],
 952                         [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
 953
 954   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 955
 956   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 957   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 958   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
 959   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
 960   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
 961
 962   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/dst_metadata.h],
 963                         [metadata_dst_alloc], [metadata_type])
 964
 965   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 966
 967   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 968                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 969   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 970                   [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
 971                                    [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
 972   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
 973   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
 974   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
 975                   [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
 976   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
 977                         [gro_receive])
 978
 979   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
 980                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 981   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 982                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 983
 984   OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
 985   OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
 986   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
 987                         [udp_add_offload], [net],
 988                         [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
 989   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 990                         [nf_defrag_ipv6_enable], [net],
 991                         [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
 992   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [family_list],
 993                         [OVS_DEFINE([HAVE_GENL_FAMILY_LIST])])
 994   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
 995                         [needs_free_netdev],
 996                         [OVS_DEFINE([HAVE_NEEDS_FREE_NETDEV])])
 997   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_dev], [cfg],
 998                         [OVS_DEFINE([HAVE_VXLAN_DEV_CFG])])
 999   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
1000                   [nf_conntrack_helper_put],
1001                   [OVS_DEFINE(HAVE_NF_CONNTRACK_HELPER_PUT)])
1002   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
1003                   [nf_nat_helper_try_module_get])
1004   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
1005                   [nf_nat_helper_put])
1006   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],[[[[:space:]]]SKB_GSO_UDP[[[:space:]]]],
1007                   [OVS_DEFINE([HAVE_SKB_GSO_UDP])])
1008   OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
1009                   [OVS_DEFINE([HAVE_DST_NOCACHE])])
1010   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
1011                         [extack],
1012                   [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
1013   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
1014                         [list],
1015                         [OVS_DEFINE([HAVE_LIST_IN_NF_HOOK_OPS])])
1016   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netfilter/nf_conntrack_common.h],
1017                   [IP_CT_UNTRACKED])
1018   OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
1019                         [netdev_master_upper_dev_link], [extack],
1020                         [OVS_DEFINE([HAVE_UPPER_DEV_LINK_EXTACK])])
1021   OVS_GREP_IFELSE([$KSRC/include/linux/compiler_types.h],
1022                   [__LINUX_COMPILER_TYPES_H],
1023                   [OVS_DEFINE([HAVE_LINUX_COMPILER_TYPES_H])])
1024   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
1025                   [ktime_get_ts64],
1026                   [OVS_DEFINE([HAVE_KTIME_GET_TS64])])
1027   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h],
1028                   [EXPORT_SYMBOL_GPL(peernet2id_alloc)],
1029                   [OVS_DEFINE([HAVE_PEERNET2ID_ALLOC])])
1030   OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
1031                   [ktime_get_ns],
1032                   [OVS_DEFINE([HAVE_KTIME_GET_NS])])
1033   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h],
1034                   frag_percpu_counter_batch[],
1035                   [OVS_DEFINE([HAVE_FRAG_PERCPU_COUNTER_BATCH])])
1036   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1037                   [null_compute_pseudo],
1038                   [OVS_DEFINE([HAVE_NULL_COMPUTE_PSEUDO])])
1039   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1040                   [__skb_checksum_convert],
1041                   [OVS_DEFINE([HAVE_SKB_CHECKSUM_CONVERT])])
1042   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
1043                         [max_mtu],
1044                         [OVS_DEFINE([HAVE_NET_DEVICE_MAX_MTU])])
1045   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip6_tunnel.h], [__ip6_tnl_parm],
1046                         [erspan_ver],
1047                         [OVS_DEFINE([HAVE_IP6_TNL_PARM_ERSPAN_VER])])
1048   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1049                   [SKB_GSO_IPXIP6],
1050                   [OVS_DEFINE([HAVE_SKB_GSO_IPXIP6])])
1051   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ipv6.h],
1052                         [ip6_make_flowlabel], [fl6],
1053                         [OVS_DEFINE([HAVE_IP6_MAKE_FLOWLABEL_FL6])])
1054   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ipv6.h], [netns_sysctl_ipv6],
1055                         [auto_flowlabels],
1056                         [OVS_DEFINE([HAVE_NETNS_SYSCTL_IPV6_AUTO_FLOWLABELS])])
1057   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
1058                   [netif_keep_dst],
1059                   [OVS_DEFINE([HAVE_NETIF_KEEP_DST])])
1060   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
1061                         [ndo_get_iflink],
1062                         [OVS_DEFINE([HAVE_NDO_GET_IFLINK])])
1063   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1064                   [skb_set_inner_ipproto],
1065                   [OVS_DEFINE([HAVE_SKB_SET_INNER_IPPROTO])])
1066   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1067                   [tunnel_encap_types],
1068                   [OVS_DEFINE([HAVE_TUNNEL_ENCAP_TYPES])])
1069   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1070                   [IFLA_IPTUN_ENCAP_TYPE],
1071                   [OVS_DEFINE([HAVE_IFLA_IPTUN_ENCAP_TYPE])])
1072   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1073                   [IFLA_IPTUN_COLLECT_METADATA],
1074                   [OVS_DEFINE([HAVE_IFLA_IPTUN_COLLECT_METADATA])])
1075   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1076                   [IFLA_GRE_ENCAP_DPORT])
1077   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1078                   [IFLA_GRE_COLLECT_METADATA])
1079   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1080                   [IFLA_GRE_IGNORE_DF])
1081   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1082                   [IFLA_GRE_FWMARK])
1083   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1084                   [IFLA_GRE_ERSPAN_INDEX])
1085   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1086                   [IFLA_GRE_ERSPAN_HWID])
1087   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_tunnel.h],
1088                   [IFLA_IPTUN_FWMARK])
1089   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
1090                         [csum_valid],
1091                         [OVS_DEFINE([HAVE_SKBUFF_CSUM_VALID])])
1092   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/skbuff.h], [sk_buff],
1093                         [vlan_present],
1094                         [OVS_DEFINE([HAVE_SKBUFF_VLAN_PRESENT])])
1095   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1096                   [skb_checksum_simple_validate])
1097   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
1098                   [void.*ndo_get_stats64],
1099                   [OVS_DEFINE([HAVE_VOID_NDO_GET_STATS64])])
1100   OVS_GREP_IFELSE([$KSRC/include/linux/timer.h], [init_timer_deferrable],
1101                   [OVS_DEFINE([HAVE_INIT_TIMER_DEFERRABLE])])
1102   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip_tunnels.h],
1103                         [ip_tunnel_info_opts_set], [flags],
1104                         [OVS_DEFINE([HAVE_IP_TUNNEL_INFO_OPTS_SET_FLAGS])])
1105   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
1106                         [rnd],
1107                         [OVS_DEFINE([HAVE_INET_FRAGS_RND])])
1108   OVS_GREP_IFELSE([$KSRC/include/linux/overflow.h], [__LINUX_OVERFLOW_H],
1109                   [OVS_DEFINE([HAVE_OVERFLOW_H])])
1110   OVS_GREP_IFELSE([$KSRC/include/linux/overflow.h], [struct_size],
1111                   [OVS_DEFINE([HAVE_STRUCT_SIZE])])
1112   OVS_GREP_IFELSE([$KSRC/include/linux/mm.h], [kvmalloc_array],
1113                   [OVS_DEFINE([HAVE_KVMALLOC_ARRAY])])
1114   OVS_GREP_IFELSE([$KSRC/include/linux/mm.h], [kvmalloc_node],
1115                   [OVS_DEFINE([HAVE_KVMALLOC_NODE])])
1116   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_l3proto.h],
1117                   [nf_conntrack_l3proto],
1118                   [OVS_DEFINE([HAVE_NF_CONNTRACK_L3PROATO_H])])
1119   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_core.h],
1120                         [nf_conntrack_in], [nf_hook_state],
1121                         [OVS_DEFINE([HAVE_NF_CONNTRACK_IN_TAKES_NF_HOOK_STATE])])
1122   OVS_GREP_IFELSE([$KSRC/include/net/ipv6_frag.h], [IP6_DEFRAG_CONNTRACK_IN],
1123                   [OVS_DEFINE([HAVE_IPV6_FRAG_H])])
1124   OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
1125                         [nf_ct_helper_ext_add], [nf_conntrack_helper],
1126                         [OVS_DEFINE([HAVE_NF_CT_HELPER_EXT_ADD_TAKES_HELPER])])
1127   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_calc_hlen],
1128                   [OVS_DEFINE([HAVE_GRE_CALC_HLEN])])
1129   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [ip_gre_calc_hlen],
1130                   [OVS_DEFINE([HAVE_IP_GRE_CALC_HLEN])])
1131   OVS_GREP_IFELSE([$KSRC/include/linux/rbtree.h], [rb_link_node_rcu],
1132                   [OVS_DEFINE([HAVE_RBTREE_RB_LINK_NODE_RCU])])
1133   OVS_GREP_IFELSE([$KSRC/include/net/dst_ops.h], [bool confirm_neigh],
1134                   [OVS_DEFINE([HAVE_DST_OPS_CONFIRM_NEIGH])])
1135   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [fqdir],
1136                   [OVS_DEFINE([HAVE_INET_FRAG_FQDIR])])
1137   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h], [genl_ops],
1138                         [policy],
1139                         [OVS_DEFINE([HAVE_GENL_OPS_POLICY])])
1140   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h],
1141                   [nla_parse_deprecated_strict],
1142                   [OVS_DEFINE([HAVE_NLA_PARSE_DEPRECATED_STRICT])])
1143   OVS_FIND_OP_PARAM_IFELSE([$KSRC/include/net/rtnetlink.h],
1144                            [validate], [extack],
1145                            [OVS_DEFINE([HAVE_RTNLOP_VALIDATE_WITH_EXTACK])])
1146   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
1147                   [__skb_set_hash])
1148   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [sw_hash])
1149   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash_raw])
1150
1151   if cmp -s datapath/linux/kcompat.h.new \
1152             datapath/linux/kcompat.h >/dev/null 2>&1; then
1153     rm datapath/linux/kcompat.h.new
1154   else
1155     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
1156   fi
1157 ])
1158
1159 dnl Checks for net/if_dl.h.
1160 dnl
1161 dnl (We use this as a proxy for checking whether we're building on FreeBSD
1162 dnl or NetBSD.)
1163 AC_DEFUN([OVS_CHECK_IF_DL],
1164   [AC_CHECK_HEADER([net/if_dl.h],
1165                    [HAVE_IF_DL=yes],
1166                    [HAVE_IF_DL=no])
1167    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
1168    if test "$HAVE_IF_DL" = yes; then
1169       AC_DEFINE([HAVE_IF_DL], [1],
1170                 [Define to 1 if net/if_dl.h is available.])
1171
1172       # On these platforms we use libpcap to access network devices.
1173       AC_SEARCH_LIBS([pcap_open_live], [pcap])
1174    fi])
1175
1176 dnl Checks for buggy strtok_r.
1177 dnl
1178 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
1179 dnl with optimization that can cause segfaults:
1180 dnl
1181 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
1182 AC_DEFUN([OVS_CHECK_STRTOK_R],
1183   [AC_CACHE_CHECK(
1184      [whether strtok_r macro segfaults on some inputs],
1185      [ovs_cv_strtok_r_bug],
1186      [AC_RUN_IFELSE(
1187         [AC_LANG_PROGRAM([#include <stdio.h>
1188                           #include <string.h>
1189                          ],
1190                          [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
1191                            /* Assume bug is present, because relatively minor
1192                               changes in compiler settings (e.g. optimization
1193                               level) can make it crop up. */
1194                            return 1;
1195                            #else
1196                            char string[] = ":::";
1197                            char *save_ptr = (char *) 0xc0ffee;
1198                            char *token1, *token2;
1199                            token1 = strtok_r(string, ":", &save_ptr);
1200                            token2 = strtok_r(NULL, ":", &save_ptr);
1201                            freopen ("/dev/null", "w", stdout);
1202                            printf ("%s %s\n", token1, token2);
1203                            return 0;
1204                            #endif
1205                           ]])],
1206         [ovs_cv_strtok_r_bug=no],
1207         [ovs_cv_strtok_r_bug=yes],
1208         [ovs_cv_strtok_r_bug=yes])])
1209    if test $ovs_cv_strtok_r_bug = yes; then
1210      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
1211                [Define if strtok_r macro segfaults on some inputs])
1212    fi
1213 ])
1214
1215 dnl ----------------------------------------------------------------------
1216 dnl These macros are from GNU PSPP, with the following original license:
1217 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
1218 dnl This file is free software; the Free Software Foundation
1219 dnl gives unlimited permission to copy and/or distribute it,
1220 dnl with or without modifications, as long as this notice is preserved.
1221
1222 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
1223   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-= ], [__])])dnl
1224   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
1225     [ovs_save_CFLAGS="$CFLAGS"
1226      dnl Include -Werror in the compiler options, because without -Werror
1227      dnl clang's GCC-compatible compiler driver does not return a failure
1228      dnl exit status even though it complains about options it does not
1229      dnl understand.
1230      dnl
1231      dnl Also, check stderr as gcc exits with status 0 for options
1232      dnl rejected at getopt level.
1233      dnl    % touch /tmp/a.c
1234      dnl    % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
1235      dnl    gcc: unrecognized option '-Qunused-arguments'
1236      dnl    0
1237      dnl    %
1238      dnl
1239      dnl In addition, GCC does not complain about a -Wno-<foo> option that
1240      dnl it does not understand, unless it has another error to report, so
1241      dnl instead of testing for -Wno-<foo>, test for the positive version.
1242      CFLAGS="$CFLAGS $WERROR m4_bpatsubst([$1], [-Wno-], [-W])"
1243      AC_COMPILE_IFELSE(
1244        [AC_LANG_SOURCE([int x;])],
1245        [if test -s conftest.err && grep "unrecognized option" conftest.err
1246         then
1247           ovs_cv_name[]=no
1248         else
1249           ovs_cv_name[]=yes
1250         fi],
1251        [ovs_cv_name[]=no])
1252      CFLAGS="$ovs_save_CFLAGS"])
1253   if test $ovs_cv_name = yes; then
1254     m4_if([$2], [], [:], [$2])
1255   else
1256     m4_if([$3], [], [:], [$3])
1257   fi
1258 ])
1259
1260 dnl OVS_CHECK_WERROR
1261 dnl
1262 dnl Check whether the C compiler accepts -Werror.
1263 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
1264 AC_DEFUN([OVS_CHECK_WERROR],
1265   [WERROR=
1266    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
1267
1268 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
1269 dnl Check whether the given C compiler OPTION is accepted.
1270 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
1271 AC_DEFUN([OVS_CHECK_CC_OPTION],
1272   [AC_REQUIRE([OVS_CHECK_WERROR])
1273    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
1274
1275 dnl OVS_ENABLE_OPTION([OPTION])
1276 dnl Check whether the given C compiler OPTION is accepted.
1277 dnl If so, add it to WARNING_FLAGS.
1278 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
1279 AC_DEFUN([OVS_ENABLE_OPTION],
1280   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
1281    AC_SUBST([WARNING_FLAGS])])
1282
1283 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
1284 dnl Check whether the given C compiler OPTION is accepted.
1285 dnl If so, enable the given Automake CONDITIONAL.
1286
1287 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
1288 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
1289   [OVS_CHECK_CC_OPTION(
1290     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
1291    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
1292 dnl ----------------------------------------------------------------------
1293
1294 dnl Check for too-old XenServer.
1295 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
1296   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
1297     [if test -e /etc/redhat-release; then
1298        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
1299      fi
1300      if test -z "$ovs_cv_xsversion"; then
1301        ovs_cv_xsversion=none
1302      fi])
1303   case $ovs_cv_xsversion in
1304     none)
1305       ;;
1306
1307     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
1308     [[6-9]]* |                           dnl XenServer 6 or later
1309     5.[[7-9]]* |                         dnl XenServer 5.7 or later
1310     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
1311     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
1312     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
1313       ;;
1314
1315     *)
1316       AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported.  (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
1317       ;;
1318   esac])
1319
1320 dnl OVS_CHECK_SPARSE_TARGET
1321 dnl
1322 dnl The "cgcc" script from "sparse" isn't very good at detecting the
1323 dnl target for which the code is being built.  This helps it out.
1324 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
1325   [AC_CACHE_CHECK(
1326     [target hint for cgcc],
1327     [ac_cv_sparse_target],
1328     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
1329        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
1330        [x86_64-*], [ac_cv_sparse_target=x86_64],
1331        [ac_cv_sparse_target=other])])
1332    AS_CASE([$ac_cv_sparse_target],
1333      [x86], [SPARSEFLAGS= CGCCFLAGS="-target=i86 -target=host_os_specs"],
1334      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS="-target=x86_64 -target=host_os_specs"],
1335      [SPARSEFLAGS= CGCCFLAGS=])
1336
1337    dnl Get the default defines for vector instructions from compiler to
1338    dnl allow "sparse" correctly check the same code that will be built.
1339    dnl Required for checking DPDK headers.
1340    AC_MSG_CHECKING([vector options for cgcc])
1341    VECTOR=$($CC -dM -E - < /dev/null | grep -E "MMX|SSE|AVX" | \
1342             cut -c 9- | sed 's/ /=/' | sed 's/^/-D/' | tr '\n' ' ')
1343    AC_MSG_RESULT([$VECTOR])
1344    CGCCFLAGS="$CGCCFLAGS $VECTOR"
1345
1346    AC_SUBST([SPARSEFLAGS])
1347    AC_SUBST([CGCCFLAGS])])
1348
1349 dnl OVS_SPARSE_EXTRA_INCLUDES
1350 dnl
1351 dnl The cgcc script from "sparse" does not search gcc's default
1352 dnl search path. Get the default search path from GCC and pass
1353 dnl them to sparse.
1354 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
1355     AC_SUBST([SPARSE_EXTRA_INCLUDES],
1356            [`$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 ' ' `] ))
1357
1358 dnl OVS_ENABLE_SPARSE
1359 AC_DEFUN([OVS_ENABLE_SPARSE],
1360   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
1361    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
1362    : ${SPARSE=sparse}
1363    AC_SUBST([SPARSE])
1364    AC_CONFIG_COMMANDS_PRE(
1365      [CC='$(if $(C:0=),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) $(SPARSE_WERROR) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'])
1366
1367    AC_ARG_ENABLE(
1368      [sparse],
1369      [AC_HELP_STRING([--enable-sparse], [Run "sparse" by default])],
1370      [], [enable_sparse=no])
1371    AM_CONDITIONAL([ENABLE_SPARSE_BY_DEFAULT], [test $enable_sparse = yes])])
1372
1373 dnl OVS_CTAGS_IDENTIFIERS
1374 dnl
1375 dnl ctags ignores symbols with extras identifiers. This is a list of
1376 dnl specially handled identifiers to be ignored. [ctags(1) -I <list>].
1377 AC_DEFUN([OVS_CTAGS_IDENTIFIERS],
1378     AC_SUBST([OVS_CTAGS_IDENTIFIERS_LIST],
1379            ["OVS_LOCKABLE OVS_NO_THREAD_SAFETY_ANALYSIS OVS_REQ_RDLOCK+ OVS_ACQ_RDLOCK+ OVS_REQ_WRLOCK+ OVS_ACQ_WRLOCK+ OVS_REQUIRES+ OVS_ACQUIRES+ OVS_TRY_WRLOCK+ OVS_TRY_RDLOCK+ OVS_TRY_LOCK+ OVS_GUARDED_BY+ OVS_EXCLUDED+ OVS_RELEASES+ OVS_ACQ_BEFORE+ OVS_ACQ_AFTER+"]))
1380
1381 dnl OVS_PTHREAD_SET_NAME
1382 dnl
1383 dnl This checks for three known variants of pthreads functions for setting
1384 dnl the name of the current thread:
1385 dnl
1386 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
1387 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
1388 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
1389 dnl
1390 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
1391 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
1392 dnl provide to it.
1393 dnl
1394 dnl This macro defines:
1395 dnl
1396 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
1397 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
1398 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
1399 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
1400   [AC_CHECK_FUNCS([pthread_set_name_np])
1401    if test $ac_cv_func_pthread_set_name_np != yes; then
1402      AC_CACHE_CHECK(
1403        [for pthread_setname_np() variant],
1404        [ovs_cv_pthread_setname_np],
1405        [AC_LINK_IFELSE(
1406          [AC_LANG_PROGRAM([#include <pthread.h>
1407   ], [pthread_setname_np(pthread_self(), "name");])],
1408          [ovs_cv_pthread_setname_np=glibc],
1409          [AC_LINK_IFELSE(
1410            [AC_LANG_PROGRAM([#include <pthread.h>
1411 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
1412            [ovs_cv_pthread_setname_np=netbsd],
1413            [ovs_cv_pthread_setname_np=none])])])
1414      case $ovs_cv_pthread_setname_np in # (
1415        glibc)
1416           AC_DEFINE(
1417             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
1418             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
1419           ;; # (
1420        netbsd)
1421           AC_DEFINE(
1422             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
1423             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
1424           ;;
1425      esac
1426    fi])
1427
1428 dnl OVS_CHECK_LINUX_HOST.
1429 dnl
1430 dnl Checks whether we're building for a Linux host, based on the presence of
1431 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
1432 dnl LINUX based on the result.
1433 AC_DEFUN([OVS_CHECK_LINUX_HOST],
1434   [AC_CACHE_CHECK(
1435      [whether __linux__ is defined],
1436      [ovs_cv_linux],
1437      [AC_COMPILE_IFELSE(
1438         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
1439         [ovs_cv_linux=true],
1440         [ovs_cv_linux=false])])
1441    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])