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064af421
BP		 1# -*- autoconf -*-
2
344f6253 3# Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Nicira, Inc.
064af421 4#
a14bc59f
BP		 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:
064af421 8#
a14bc59f
BP		 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.
064af421 16
a64e37a1
BP		 17dnl OVS_ENABLE_WERROR
18AC_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$enable_Werror" = Xyes; then
95626395 25 OVS_CFLAGS="$OVS_CFLAGS -Werror"
308bf988
BP		 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$enable_Werror" = Xyes; then
31 FLAKE8_WERROR=
32 else
33 FLAKE8_WERROR=-
34 fi
df265086
BP		 35 AC_SUBST([FLAKE8_WERROR])
36
37 # If --enable-Werror is specified, fail the build on sparse warnings.
38 if test "X$enable_Werror" = Xyes; then
39 SPARSE_WERROR=-Wsparse-error
40 else
41 SPARSE_WERROR=
42 fi
43 AC_SUBST([SPARSE_WERROR])])
a64e37a1 44
e3438006 45dnl OVS_CHECK_LINUX
064af421 46dnl
997d327d 47dnl Configure linux kernel source tree
e3438006 48AC_DEFUN([OVS_CHECK_LINUX], [
8a2d6596
BP		 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
a0903134
YT		 55 (usually figured out automatically from build
56 directory)])])
8a2d6596
BP		 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=$with_l26_source
76 AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
0a89c170
BP		 77 else
78 KSRC=
8a2d6596
BP		 79 fi
80 elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
81 AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
82 fi
83
e3438006
BP		 84 if test -n "$KBUILD"; then
85 KBUILD=`eval echo "$KBUILD"`
86 case $KBUILD in
0b6d72fc 87 /*) ;;
e3438006 88 *) KBUILD=`pwd`/$KBUILD ;;
0b6d72fc 89 esac
064af421 90
7c9e113b
BP		 91 # The build directory is what the user provided.
92 # Make sure that it exists.
8a2d6596 93 AC_MSG_CHECKING([for Linux build directory])
e3438006 94 if test -d "$KBUILD"; then
a0903134
YT		 95 AC_MSG_RESULT([$KBUILD])
96 AC_SUBST(KBUILD)
064af421 97 else
a0903134
YT		 98 AC_MSG_RESULT([no])
99 AC_ERROR([source dir $KBUILD doesn't exist])
064af421
BP		 100 fi
101
7c9e113b 102 # Debian breaks kernel headers into "source" header and "build" headers.
e3438006 103 # We want the source headers, but $KBUILD gives us the "build" headers.
7c9e113b 104 # Use heuristics to find the source headers.
8a2d6596 105 AC_MSG_CHECKING([for Linux source directory])
e3438006
BP		 106 if test -n "$KSRC"; then
107 KSRC=`eval echo "$KSRC"`
108 case $KSRC in
f5fb5de6 109 /*) ;;
e3438006 110 *) KSRC=`pwd`/$KSRC ;;
b57f675c 111 esac
e3438006 112 if test ! -e $KSRC/include/linux/kernel.h; then
53319f95 113 AC_MSG_ERROR([$KSRC is not a kernel source directory])
f5fb5de6
BP		 114 fi
115 else
e3438006
BP		 116 KSRC=$KBUILD
117 if test ! -e $KSRC/include/linux/kernel.h; then
fe0731b1
BP		 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
f5fb5de6 133 fi
fe0731b1 134 if test ! -e "$KSRC"/include/linux/kernel.h; then
8a2d6596 135 AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
7c9e113b
BP		 136 fi
137 fi
e3438006 138 AC_MSG_RESULT([$KSRC])
7c9e113b
BP		 139
140 AC_MSG_CHECKING([for kernel version])
71fe9970 141 version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
e3438006
BP		 142 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
143 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
71fe9970 144 if test X"$version" = X || test X"$patchlevel" = X; then
7c9e113b 145 AC_ERROR([cannot determine kernel version])
71fe9970
BP		 146 elif test X"$sublevel" = X; then
147 kversion=$version.$patchlevel
148 else
149 kversion=$version.$patchlevel.$sublevel
7c9e113b 150 fi
71fe9970
BP		 151 AC_MSG_RESULT([$kversion])
152
3afcde43 153 if test "$version" -ge 4; then
bba78707 154 if test "$version" = 4 && test "$patchlevel" -le 15; then
3afcde43 155 : # Linux 4.x
d76aabea 156 else
bba78707 157 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 4.15.x is not supported (please refer to the FAQ for advice)])
d76aabea 158 fi
8063e095 159 elif test "$version" = 3 && test "$patchlevel" -ge 10; then
3afcde43 160 : # Linux 3.x
71fe9970 161 else
8063e095 162 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 3.10 or later is required])
064af421 163 fi
2520f452
IY		 164 if (test ! -e "$KBUILD"/include/linux/version.h && \
165 test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
e3438006
BP		 166 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
167 test ! -e "$KBUILD"/include/generated/autoconf.h); then
a0903134 168 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
064af421 169 fi
e3438006 170 OVS_CHECK_LINUX_COMPAT
064af421 171 fi
e3438006 172 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
064af421
BP		 173])
174
1dc0da67
PB		 175dnl OVS_CHECK_LINUX_TC
176dnl
177dnl Configure Linux tc compat.
178AC_DEFUN([OVS_CHECK_LINUX_TC], [
179 AC_COMPILE_IFELSE([
180 AC_LANG_PROGRAM([#include <linux/pkt_cls.h>], [
2517aa5a 181 int x = TCA_FLOWER_KEY_IP_TTL_MASK;
1dc0da67 182 ])],
2517aa5a
PB		 183 [AC_DEFINE([HAVE_TCA_FLOWER_KEY_IP_TTL_MASK], [1],
184 [Define to 1 if TCA_FLOWER_KEY_IP_TTL_MASK is avaiable.])])
1dc0da67
PB		 185
186 AC_COMPILE_IFELSE([
187 AC_LANG_PROGRAM([#include <linux/tc_act/tc_vlan.h>], [
188 int x = TCA_VLAN_PUSH_VLAN_PRIORITY;
189 ])],
190 [AC_DEFINE([HAVE_TCA_VLAN_PUSH_VLAN_PRIORITY], [1],
191 [Define to 1 if TCA_VLAN_PUSH_VLAN_PRIORITY is avaiable.])])
192
193 AC_COMPILE_IFELSE([
194 AC_LANG_PROGRAM([#include <linux/tc_act/tc_tunnel_key.h>], [
195 int x = TCA_TUNNEL_KEY_ENC_DST_PORT;
196 ])],
197 [AC_DEFINE([HAVE_TCA_TUNNEL_KEY_ENC_DST_PORT], [1],
198 [Define to 1 if TCA_TUNNEL_KEY_ENC_DST_PORT is avaiable.])])
e5b1657e
PB		 199
200 AC_COMPILE_IFELSE([
201 AC_LANG_PROGRAM([#include <linux/tc_act/tc_pedit.h>], [
202 int x = TCA_PEDIT_KEY_EX_HDR_TYPE_UDP;
203 ])],
204 [AC_DEFINE([HAVE_TCA_PEDIT_KEY_EX_HDR_TYPE_UDP], [1],
205 [Define to 1 if TCA_PEDIT_KEY_EX_HDR_TYPE_UDP is avaiable.])])
1dc0da67
PB		 206])
207
8a9562d2
PS		 208dnl OVS_CHECK_DPDK
209dnl
210dnl Configure DPDK source tree
211AC_DEFUN([OVS_CHECK_DPDK], [
212 AC_ARG_WITH([dpdk],
213 [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
4c16ee48
MV		 214 [Specify the DPDK build directory])],
215 [have_dpdk=true])
8a9562d2 216
40b5ea86 217 AC_MSG_CHECKING([whether dpdk datapath is enabled])
4c16ee48 218 if test "$have_dpdk" != true || test "$with_dpdk" = no; then
40b5ea86
BB		 219 AC_MSG_RESULT([no])
220 DPDKLIB_FOUND=false
221 else
222 AC_MSG_RESULT([yes])
223 case "$with_dpdk" in
224 yes)
225 DPDK_AUTO_DISCOVER="true"
96195c09
CE		 226 PKG_CHECK_MODULES([DPDK], [libdpdk],
227 [DPDK_INCLUDE="$DPDK_CFLAGS"],
228 [DPDK_INCLUDE="-I/usr/local/include/dpdk -I/usr/include/dpdk"])
40b5ea86
BB		 229 ;;
230 *)
231 DPDK_AUTO_DISCOVER="false"
96195c09 232 DPDK_INCLUDE_PATH="$with_dpdk/include"
40b5ea86
BB		 233 # If 'with_dpdk' is passed install directory, point to headers
234 # installed in $DESTDIR/$prefix/include/dpdk
96195c09
CE		 235 if test -e "$DPDK_INCLUDE_PATH/rte_config.h"; then
236 DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH"
237 elif test -e "$DPDK_INCLUDE_PATH/dpdk/rte_config.h"; then
238 DPDK_INCLUDE="-I$DPDK_INCLUDE_PATH/dpdk"
214ac6d4 239 fi
40b5ea86
BB		 240 DPDK_LIB_DIR="$with_dpdk/lib"
241 ;;
242 esac
8a9562d2 243
18f777b2 244 DPDK_LIB="-ldpdk"
10d01ad2 245 DPDK_EXTRA_LIB=""
8a9562d2 246
95626395
TG		 247 ovs_save_CFLAGS="$CFLAGS"
248 ovs_save_LDFLAGS="$LDFLAGS"
96195c09 249 CFLAGS="$CFLAGS $DPDK_INCLUDE"
40b5ea86
BB		 250 if test "$DPDK_AUTO_DISCOVER" = "false"; then
251 LDFLAGS="$LDFLAGS -L${DPDK_LIB_DIR}"
252 fi
253
435aaddd
CL		 254 AC_COMPILE_IFELSE([
255 AC_LANG_PROGRAM(
256 [
257 #include <rte_config.h>
258#if RTE_LIBRTE_VHOST_NUMA
259#error
260#endif
261 ], [])
262 ], [],
263 [AC_SEARCH_LIBS([get_mempolicy],[numa],[],[AC_MSG_ERROR([unable to find libnuma, install the dependency package])])
5b9bf9e0
CL		 264 DPDK_EXTRA_LIB="-lnuma"
265 AC_DEFINE([VHOST_NUMA], [1], [NUMA Aware vHost support detected in DPDK.])])
16dfb8fa 266
4b88d678
CL		 267 AC_COMPILE_IFELSE([
268 AC_LANG_PROGRAM(
269 [
270 #include <rte_config.h>
271#if RTE_LIBRTE_PMD_PCAP
272#error
273#endif
274 ], [])
275 ], [],
276 [AC_SEARCH_LIBS([pcap_dump],[pcap],[],[AC_MSG_ERROR([unable to find libpcap, install the dependency package])])
277 DPDK_EXTRA_LIB="-lpcap"
278 AC_COMPILE_IFELSE([
279 AC_LANG_PROGRAM(
280 [
281 #include <rte_config.h>
282#if RTE_LIBRTE_PDUMP
283#error
284#endif
285 ], [])
286 ], [],
287 [AC_DEFINE([DPDK_PDUMP], [1], [DPDK pdump enabled in OVS.])])
288 ])
289
c1223b11
DDP		 290 # On some systems we have to add -ldl to link with dpdk
291 #
292 # This code, at first, tries to link without -ldl (""),
293 # then adds it and tries again.
294 # Before each attempt the search cache must be unset,
295 # otherwise autoconf will stick with the old result
296
40b5ea86 297 DPDKLIB_FOUND=false
c1223b11
DDP		 298 save_LIBS=$LIBS
299 for extras in "" "-ldl"; do
435aaddd 300 LIBS="$DPDK_LIB $extras $save_LIBS $DPDK_EXTRA_LIB"
c1223b11
DDP		 301 AC_LINK_IFELSE(
302 [AC_LANG_PROGRAM([#include <rte_config.h>
303 #include <rte_eal.h>],
304 [int rte_argc; char ** rte_argv;
305 rte_eal_init(rte_argc, rte_argv);])],
40b5ea86
BB		 306 [DPDKLIB_FOUND=true])
307 if $DPDKLIB_FOUND; then
c1223b11
DDP		 308 break
309 fi
310 done
40b5ea86
BB		 311
312 # If linking unsuccessful
313 if test "$DPDKLIB_FOUND" = "false" ; then
314 if $DPDK_AUTO_DISCOVER; then
315 AC_MSG_ERROR([Could not find DPDK library in default search path, Use --with-dpdk to specify the DPDK library installed in non-standard location])
316 else
317 AC_MSG_ERROR([Could not find DPDK libraries in $DPDK_LIB_DIR])
318 fi
c1223b11 319 fi
95626395
TG		 320 CFLAGS="$ovs_save_CFLAGS"
321 LDFLAGS="$ovs_save_LDFLAGS"
40b5ea86
BB		 322 if test "$DPDK_AUTO_DISCOVER" = "false"; then
323 OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
324 fi
96195c09 325 OVS_CFLAGS="$OVS_CFLAGS $DPDK_INCLUDE"
ab2a3154 326 OVS_ENABLE_OPTION([-mssse3])
8a9562d2 327
3c94676c 328 # DPDK pmd drivers are not linked unless --whole-archive is used.
d7310583
DDP		 329 #
330 # This happens because the rest of the DPDK code doesn't use any symbol in
331 # the pmd driver objects, and the drivers register themselves using an
332 # __attribute__((constructor)) function.
333 #
334 # These options are specified inside a single -Wl directive to prevent
335 # autotools from reordering them.
3c94676c 336 DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
9475dfeb 337 AC_SUBST([DPDK_vswitchd_LDFLAGS])
8a9562d2 338 AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
8a9562d2
PS		 339 fi
340
40b5ea86 341 AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
8a9562d2
PS		 342])
343
8828e5c7 344dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
064af421
BP		 345dnl
346dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
8828e5c7
BP		 347dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
348dnl <REGEX> translated to uppercase.
064af421
BP		 349AC_DEFUN([OVS_GREP_IFELSE], [
350 AC_MSG_CHECKING([whether $2 matches in $1])
7507ec48
JG		 351 if test -f $1; then
352 grep '$2' $1 >/dev/null 2>&1
353 status=$?
354 case $status in
997d327d 355 0)
7507ec48 356 AC_MSG_RESULT([yes])
8828e5c7 357 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
7507ec48 358 ;;
997d327d 359 1)
7507ec48
JG		 360 AC_MSG_RESULT([no])
361 $4
362 ;;
997d327d 363 *)
7507ec48
JG		 364 AC_MSG_ERROR([grep exited with status $status])
365 ;;
366 esac
367 else
368 AC_MSG_RESULT([file not found])
369 $4
370 fi
064af421
BP		 371])
372
13dd4a97
JS		 373dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
374dnl
375dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
376dnl structure definition. If this is successful, runs IF-MATCH, otherwise
377dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
378dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
379dnl translated to uppercase.
380AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
381 AC_MSG_CHECKING([whether $2 has member $3 in $1])
382 if test -f $1; then
83a27884 383 awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
13dd4a97
JS		 384 status=$?
385 case $status in
386 0)
387 AC_MSG_RESULT([yes])
388 m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
389 ;;
390 1)
391 AC_MSG_RESULT([no])
392 $5
393 ;;
394 *)
395 AC_MSG_ERROR([grep exited with status $status])
396 ;;
397 esac
398 else
399 AC_MSG_RESULT([file not found])
400 $5
401 fi
402])
403
71ce9edd
JR		 404dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
405dnl
406dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
407dnl the function signature starting from the line matching FUNCTION
408dnl and ending with the line containing the closing parenthesis. If
409dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH. If
410dnl IF-MATCH is empty then it defines to
411dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
412dnl <REGEX> translated to uppercase.
413AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
414 AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
415 if test -f $1; then
416 awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
417 status=$?
418 case $status in
419 0)
420 AC_MSG_RESULT([yes])
421 m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
422 ;;
423 1)
424 AC_MSG_RESULT([no])
425 $5
426 ;;
427 *)
428 AC_MSG_ERROR([grep exited with status $status])
429 ;;
430 esac
431 else
432 AC_MSG_RESULT([file not found])
433 $5
434 fi
435])
436
064af421
BP		 437dnl OVS_DEFINE(NAME)
438dnl
439dnl Defines NAME to 1 in kcompat.h.
440AC_DEFUN([OVS_DEFINE], [
22bcc0e7 441 echo '#define $1 1' >> datapath/linux/kcompat.h.new
064af421
BP		 442])
443
e3438006 444dnl OVS_CHECK_LINUX_COMPAT
064af421 445dnl
8063e095 446dnl Runs various Autoconf checks on the Linux kernel source in
e3438006
BP		 447dnl the directory in $KBUILD.
448AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
22bcc0e7
JG		 449 rm -f datapath/linux/kcompat.h.new
450 mkdir -p datapath/linux
451 : > datapath/linux/kcompat.h.new
4aa13c0c 452
e23775f2
PS		 453 echo '#include <linux/version.h>
454#ifndef RHEL_RELEASE_CODE
455#define RHEL_RELEASE_CODE 0
456#define RHEL_RELEASE_VERSION(a, b) 0
457#endif' >> datapath/linux/kcompat.h.new
458
e3438006 459 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
25fb3596
JG		 460 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
461
e23775f2
PS		 462 OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
463 [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
464 OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
465
e3438006 466 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
4303ec34 467 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
54125dd0 468 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [PTR_ERR_OR_ZERO])
4aa13c0c 469
d923a695 470 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
e2f3178f 471 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
d923a695 472
e23775f2
PS		 473 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
474 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
475 OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
d923a695 476 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
ec96e663 477 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
d923a695 478
e3438006 479 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
46d69d18 480 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
2ea82414
PS		 481 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
482 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
e23775f2
PS		 483 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
484 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
485
13dd4a97
JS		 486 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
487 [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
39c0ff22
JS		 488 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
489 [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
0374bcbe
EB		 490 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
491 [ip_do_fragment], [net],
492 [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
0643a78b
PS		 493 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
494 [ip_local_out], [net],
495 [OVS_DEFINE([HAVE_IP_LOCAL_OUT_TAKES_NET])])
496
cfda4537 497 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
0f09d6e3
JS		 498
499 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
500 [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
06f1a61a 501 OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
595e069a
JS		 502 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
503 [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
8f00ece9
JS		 504 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
505 [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
e0d45da3 506 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
ccd0a13b 507 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evictor])
91408ae0
JS		 508 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
509 [frags_work])
d1c390e6
JS		 510 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
511 [rwlock])
e0d45da3
JS		 512 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
513 [list_evictor])
38f45380 514 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_lru_move])
6ccf21ca
YHW		 515 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/inet_frag.h],
516 [sub_frag_mem_limit], [struct.netns_frags],
517 [OVS_DEFINE([HAVE_SUB_FRAG_MEM_LIMIT_ARG_STRUCT_NETNS_FRAGS])])
518 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [void.*inet_frags_init],
519 [OVS_DEFINE([HAVE_VOID_INET_FRAGS_INIT])])
401da7b9
JS		 520 OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
521 [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
8f00ece9 522
f2252c61
PS		 523 dnl Check for dst_cache and ipv6 lable to use backported tunnel infrastructure.
524 dnl OVS does not really need ipv6 label field, but its presence signifies that
525 dnl the stack has all required ipv6 support.
526 dnl OVS also does not need dst_cache But this dependency allows us to write
527 dnl much cleaner code.
528
3259c4ff
PS		 529 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/ip_tunnels.h], [ip_tunnel_key],
530 [label],
531 [OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h],
532 [iptunnel_pull_offloads],
997d327d 533 [OVS_GREP_IFELSE([$KSRC/include/net/dst_cache.h], [dst_cache],
f2252c61 534 [OVS_DEFINE([USE_UPSTREAM_TUNNEL])])])])
4aa13c0c 535
65590144
YHW		 536 OVS_GREP_IFELSE([$KSRC/include/net/mpls.h], [mpls_hdr],
537 [OVS_DEFINE([MPLS_HEADER_IS_L3])])
fdce83a3
PS		 538 OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
539 [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
aad7cb91 540 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
e3438006
BP		 541 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
542 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
543 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
3f506f07 544 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
42d5dd95 545 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
96b82f6d 546 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_gso_error_unwind])
42d5dd95 547 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
e23775f2 548 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
0a0d9095
PS		 549 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_features_check],
550 [OVS_DEFINE([USE_UPSTREAM_TUNNEL_GSO])])
f2252c61
PS		 551 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_vxlan_port])
552 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_add_geneve_port])
d1890de5 553 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
8063e095
PS		 554 dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
555 dnl So check type of tstats.
556 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
557 [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
e23775f2
PS		 558 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
559 [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
a0c9fedc 560 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [skb_csum_hwoffload_help])
e23775f2
PS		 561 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
562 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
563 [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
564 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
8ce37339 565 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [IFF_PHONY_HEADROOM])
6ccf21ca
YHW		 566 OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_ops],
567 [extended])
7efb1e09
PS		 568 OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
569 [netdev_master_upper_dev_link], [upper_priv],
570 [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_PRIV])])
b7ab7316
YHW		 571 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h],
572 [netdev_master_upper_dev_link_rh],
573 [OVS_DEFINE([HAVE_NETDEV_MASTER_UPPER_DEV_LINK_RH])])
574
6c0bf091
JW		 575 OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
576 [max_mtu])
e23775f2
PS		 577
578 OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
579 OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
cd7330d0
PS		 580 OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
581 [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
0643a78b
PS		 582 OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn], [priv],
583 [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_PRIV])])
584 OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
585 [owner], [OVS_DEFINE([HAVE_NF_HOOKS_OPS_OWNER])])
586
e4e04c3b 587 OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
2b64e8fc 588 [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
e2f3178f 589
6d9b6937
JR		 590 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
591 [nf_conn], [struct timer_list[[ \t]]*timeout],
592 [OVS_DEFINE([HAVE_NF_CONN_TIMER])])
593 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
594 [nf_ct_delete(], [OVS_DEFINE([HAVE_NF_CT_DELETE])])
595
71ce9edd
JR		 596 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
597 [nf_ct_tmpl_alloc], [nf_conntrack_zone],
057772cf 598 [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
71ce9edd
JR		 599 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
600 [nf_ct_get_tuplepr], [struct.net],
fa67f8e0 601 [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
dfa791b2
FW		 602 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
603 [nf_ct_set])
56ec5593
JS		 604 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
605 [nf_ct_is_untracked])
ac9cd0d2
JS		 606 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
607 [nf_ct_zone_init])
459064e7
JS		 608 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
609 [nf_connlabels_get])
7f2ab8cd
JR		 610 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
611 [nf_connlabels_get], [int bit],
612 [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
9f04eabe
JR		 613 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
614 [nf_conn_labels], [words])
0d330e42
JR		 615 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
616 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
617 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
057772cf 618
e2f3178f 619 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
f000c879 620 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
4aa13c0c 621
e23775f2
PS		 622 OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
623 OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
624 OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
625 [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
626 OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
627
e3438006
BP		 628 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
629 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
cf6cb3a2 630 [rcu_read_lock_held])])
8fa52250 631 OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
997d327d 632
6a33828d
BP		 633 # Check for the proto_data_valid member in struct sk_buff. The [^@]
634 # is necessary because some versions of this header remove the
635 # member but retain the kerneldoc comment that describes it (which
636 # starts with @). The brackets must be doubled because of m4
637 # quoting rules.
e3438006 638 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
6a33828d 639 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
ccb75a28 640 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
e23775f2 641 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
f2252c61 642 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol_type])
c1eb2500 643 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_inner_transport_offset])
d23239a2 644 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
60c4904f 645 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
5640cbd8
JG		 646 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
647 [OVS_DEFINE([HAVE_U16_RXHASH])])
e3438006 648 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
85444c3f 649 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
997d327d 650 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
8828e5c7 651 [skb_copy_from_linear_data_offset])
b9c15df9
PS		 652 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
653 [skb_reset_tail_pointer])
e3438006 654 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
e3438006 655 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
4aa13c0c 656 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
e3438006 657 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
6c4ea27c 658 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
da4bbeb7 659 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
0aa6fda7 660 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
d923a695 661 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
dc0d542d 662 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
1edc458d 663 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
c253c2e3
MC		 664 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
665 [OVS_DEFINE([HAVE_SKB_GET_HASH])])
e2f3178f 666 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
705e9260
PS		 667 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
668 [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
75e93287
FL		 669 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
670 [OVS_DEFINE([HAVE_L4_RXHASH])])
5cce04b6 671 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
97894370 672 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
a27c454e 673 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_vlan_pop])
97894370 674 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
c6e13fcc 675 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash_if_not_l4])
ea3acd7a 676 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_postpush_rcsum])
73daf51a 677 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [lco_csum])
d3c313c1 678 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_nfct])
0ace0a26 679 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_put_zero])
4aa13c0c 680
e3438006 681 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
4aa13c0c 682 [OVS_DEFINE([HAVE_BOOL_TYPE])])
e3438006 683 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
e215ebca 684 [OVS_DEFINE([HAVE_CSUM_TYPES])])
8dbe1f9f
PS		 685 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
686 [OVS_DEFINE([HAVE_CSUM_TYPES])])
4aa13c0c 687
e3438006
BP		 688 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
689 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
4aa13c0c 690
0d03e51c 691 OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
1dba1690 692 OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
0d03e51c 693
114fce23
SG		 694 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
695 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
14002a59 696 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
6233a1bd
TG		 697 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
698 [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
c623ba49 699 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
13dd4a97
JS		 700 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
701 [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
0643a78b
PS		 702 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/genetlink.h],
703 [genl_notify], [net],
704 [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_NET])])
705
13dd4a97
JS		 706
707 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
708 [genl_multicast_group], [id])
fdce83a3 709 OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
13dd4a97 710
cc1d0dea 711 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
e23775f2 712 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
8abaa53c 713 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
e23775f2 714 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
2d3ef70b 715 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
a94ebc39
JS		 716 OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
717 [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
213e1f54
JS		 718 OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
719 [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
720
91b37647 721 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_64bit])
e3438006 722 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
42d5dd95
TG		 723 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
724 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
725 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
dd693f9b 726 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
e3438006 727 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
0fcc086d 728 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
6dbd98e6
SH		 729 OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
730 [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
15702dc9
JB		 731 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netlink.h],
732 [nla_parse], [netlink_ext_ack],
733 [OVS_DEFINE([HAVE_NETLINK_EXT_ACK])])
4aa13c0c 734
c4e976db
JG		 735 OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
736
e3438006 737 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
431488e6 738 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
1f649f1c 739 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
17e3889f 740 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
e23775f2 741 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
5c3f23fe 742 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [skb_vlan_tagged])
ca6da1b1 743 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [eth_type_vlan])
431488e6 744
aadd6ae9
JS		 745 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/dst_metadata.h],
746 [metadata_dst_alloc], [metadata_type])
747
09f27436
JG		 748 OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
749
3174a818
TG		 750 OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
751 [OVS_DEFINE([HAVE_VXLAN_METADATA])])
f6a0c895 752 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
13dd4a97
JS		 753 [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
754 [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
755 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
e23775f2 756 OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
06aeda48
PS		 757 OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [sk_buff.*udp_tunnel_handle_offloads],
758 [OVS_DEFINE([HAVE_UDP_TUNNEL_HANDLE_OFFLOAD_RET_SKB])])
d7e58913
PS		 759 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_sock_cfg],
760 [gro_receive])
e23775f2
PS		 761
762 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
f6a0c895
TG		 763 [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
764 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
765 [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
f285d3e7 766
b7ebebcd
PS		 767 OVS_GREP_IFELSE([$KSRC/include/net/sock.h], [sk_no_check_tx])
768 OVS_GREP_IFELSE([$KSRC/include/linux/udp.h], [no_check6_tx])
21a719d6
FL		 769 OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
770 [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
c970aa4e
PS		 771 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/protocol.h],
772 [udp_add_offload], [net],
773 [OVS_DEFINE([HAVE_UDP_ADD_OFFLOAD_TAKES_NET])])
802d12b6
GR		 774 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
775 [nf_defrag_ipv6_enable], [net],
776 [OVS_DEFINE([HAVE_DEFRAG_ENABLE_TAKES_NET])])
bef862bc
GR		 777 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [family_list],
778 [OVS_DEFINE([HAVE_GENL_FAMILY_LIST])])
7f15e8dd
GR		 779 OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netdevice.h], [net_device],
780 [needs_free_netdev],
781 [OVS_DEFINE([HAVE_NEEDS_FREE_NETDEV])])
14365643
GR		 782 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_dev], [cfg],
783 [OVS_DEFINE([HAVE_VXLAN_DEV_CFG])])
ac8e3c6d 784 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_helper.h],
35fc0638
GR		 785 [nf_conntrack_helper_put],
786 [OVS_DEFINE(HAVE_NF_CONNTRACK_HELPER_PUT)])
f90e29c9 787 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],[[[[:space:]]]SKB_GSO_UDP[[[:space:]]]],
ad283644 788 [OVS_DEFINE([HAVE_SKB_GSO_UDP])])
e0b0150c
GR		 789 OVS_GREP_IFELSE([$KSRC/include/net/dst.h],[DST_NOCACHE],
790 [OVS_DEFINE([HAVE_DST_NOCACHE])])
6b51641a
GR		 791 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_link_ops],
792 [extack],
793 [OVS_DEFINE([HAVE_EXT_ACK_IN_RTNL_LINKOPS])])
a5220693
GR		 794 OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_ops],
795 [list],
796 [OVS_DEFINE([HAVE_LIST_IN_NF_HOOK_OPS])])
c0802634
EG		 797 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netfilter/nf_conntrack_common.h],
798 [IP_CT_UNTRACKED])
36d3520b
GR		 799 OVS_FIND_PARAM_IFELSE([$KSRC/include/linux/netdevice.h],
800 [netdev_master_upper_dev_link], [extack],
801 [OVS_DEFINE([HAVE_UPPER_DEV_LINK_EXTACK])])
a61fbfa4
GR		 802 OVS_GREP_IFELSE([$KSRC/include/linux/compiler_types.h],
803 [__LINUX_COMPILER_TYPES_H],
804 [OVS_DEFINE([HAVE_LINUX_COMPILER_TYPES_H])])
6deeb55a
AB		 805 OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
806 [ktime_get_ts64],
807 [OVS_DEFINE([HAVE_KTIME_GET_TS64])])
b147f2e9
JB		 808 OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h],
809 [EXPORT_SYMBOL_GPL(peernet2id_alloc)],
810 [OVS_DEFINE([HAVE_PEERNET2ID_ALLOC])])
1cb57039
AZ		 811 OVS_GREP_IFELSE([$KSRC/include/linux/timekeeping.h],
812 [ktime_get_ns],
813 [OVS_DEFINE([HAVE_KTIME_GET_NS])])
21a719d6 814
22bcc0e7
JG		 815 if cmp -s datapath/linux/kcompat.h.new \
816 datapath/linux/kcompat.h >/dev/null 2>&1; then
817 rm datapath/linux/kcompat.h.new
064af421 818 else
22bcc0e7 819 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
064af421
BP		 820 fi
821])
822
823dnl Checks for net/if_packet.h.
824AC_DEFUN([OVS_CHECK_IF_PACKET],
825 [AC_CHECK_HEADER([net/if_packet.h],
826 [HAVE_IF_PACKET=yes],
827 [HAVE_IF_PACKET=no])
828 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
829 if test "$HAVE_IF_PACKET" = yes; then
830 AC_DEFINE([HAVE_IF_PACKET], [1],
831 [Define to 1 if net/if_packet.h is available.])
832 fi])
833
f6eb6b20 834dnl Checks for net/if_dl.h.
d30e714c 835dnl
d23fa2ed
YT		 836dnl (We use this as a proxy for checking whether we're building on FreeBSD
837dnl or NetBSD.)
9360d9b7
EM		 838AC_DEFUN([OVS_CHECK_IF_DL],
839 [AC_CHECK_HEADER([net/if_dl.h],
840 [HAVE_IF_DL=yes],
841 [HAVE_IF_DL=no])
842 AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
843 if test "$HAVE_IF_DL" = yes; then
844 AC_DEFINE([HAVE_IF_DL], [1],
845 [Define to 1 if net/if_dl.h is available.])
d30e714c 846
d23fa2ed 847 # On these platforms we use libpcap to access network devices.
d30e714c 848 AC_SEARCH_LIBS([pcap_open_live], [pcap])
9360d9b7
EM		 849 fi])
850
e50097d2
BP		 851dnl Checks for buggy strtok_r.
852dnl
853dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
854dnl with optimization that can cause segfaults:
855dnl
856dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
857AC_DEFUN([OVS_CHECK_STRTOK_R],
858 [AC_CACHE_CHECK(
859 [whether strtok_r macro segfaults on some inputs],
860 [ovs_cv_strtok_r_bug],
861 [AC_RUN_IFELSE(
862 [AC_LANG_PROGRAM([#include <stdio.h>
863 #include <string.h>
864 ],
416e7132
BP		 865 [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
866 /* Assume bug is present, because relatively minor
867 changes in compiler settings (e.g. optimization
868 level) can make it crop up. */
869 return 1;
870 #else
871 char string[] = ":::";
e50097d2
BP		 872 char *save_ptr = (char *) 0xc0ffee;
873 char *token1, *token2;
874 token1 = strtok_r(string, ":", &save_ptr);
875 token2 = strtok_r(NULL, ":", &save_ptr);
5819a7cd 876 freopen ("/dev/null", "w", stdout);
e50097d2
BP		 877 printf ("%s %s\n", token1, token2);
878 return 0;
416e7132 879 #endif
e50097d2
BP		 880 ]])],
881 [ovs_cv_strtok_r_bug=no],
882 [ovs_cv_strtok_r_bug=yes],
883 [ovs_cv_strtok_r_bug=yes])])
884 if test $ovs_cv_strtok_r_bug = yes; then
885 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
886 [Define if strtok_r macro segfaults on some inputs])
887 fi
888])
889
064af421
BP		 890dnl ----------------------------------------------------------------------
891dnl These macros are from GNU PSPP, with the following original license:
892dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
893dnl This file is free software; the Free Software Foundation
894dnl gives unlimited permission to copy and/or distribute it,
895dnl with or without modifications, as long as this notice is preserved.
896
50194820 897AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
726af752 898 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-= ], [__])])dnl
064af421
BP		 899 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
900 [ovs_save_CFLAGS="$CFLAGS"
50194820
BP		 901 dnl Include -Werror in the compiler options, because without -Werror
902 dnl clang's GCC-compatible compiler driver does not return a failure
903 dnl exit status even though it complains about options it does not
904 dnl understand.
c2deac54
YT		 905 dnl
906 dnl Also, check stderr as gcc exits with status 0 for options
907 dnl rejected at getopt level.
908 dnl % touch /tmp/a.c
909 dnl % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
910 dnl gcc: unrecognized option '-Qunused-arguments'
911 dnl 0
912 dnl %
50194820 913 CFLAGS="$CFLAGS $WERROR $1"
37f4615e
BP		 914 AC_COMPILE_IFELSE(
915 [AC_LANG_SOURCE([int x;])],
916 [if test -s conftest.err && grep "unrecognized option" conftest.err
917 then
918 ovs_cv_name[]=no
919 else
920 ovs_cv_name[]=yes
921 fi],
922 [ovs_cv_name[]=no])
064af421
BP		 923 CFLAGS="$ovs_save_CFLAGS"])
924 if test $ovs_cv_name = yes; then
83f6c050 925 m4_if([$2], [], [:], [$2])
064af421
BP		 926 else
927 m4_if([$3], [], [:], [$3])
928 fi
929])
930
50194820
BP		 931dnl OVS_CHECK_WERROR
932dnl
933dnl Check whether the C compiler accepts -Werror.
934dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
935AC_DEFUN([OVS_CHECK_WERROR],
936 [WERROR=
937 _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
938
939dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
940dnl Check whether the given C compiler OPTION is accepted.
941dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
942AC_DEFUN([OVS_CHECK_CC_OPTION],
943 [AC_REQUIRE([OVS_CHECK_WERROR])
944 _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
945
064af421
BP		 946dnl OVS_ENABLE_OPTION([OPTION])
947dnl Check whether the given C compiler OPTION is accepted.
d161c099 948dnl If so, add it to WARNING_FLAGS.
064af421
BP		 949dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
950AC_DEFUN([OVS_ENABLE_OPTION],
d161c099
BP		 951 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
952 AC_SUBST([WARNING_FLAGS])])
c72e245a
BP		 953
954dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
955dnl Check whether the given C compiler OPTION is accepted.
956dnl If so, enable the given Automake CONDITIONAL.
957
958dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
959AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
960 [OVS_CHECK_CC_OPTION(
961 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
962 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
064af421 963dnl ----------------------------------------------------------------------
ed2d4f6a
BP		 964
965dnl Check for too-old XenServer.
966AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
967 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
968 [if test -e /etc/redhat-release; then
969 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
970 fi
971 if test -z "$ovs_cv_xsversion"; then
972 ovs_cv_xsversion=none
973 fi])
974 case $ovs_cv_xsversion in
975 none)
976 ;;
977
978 [[1-9]][[0-9]]* | dnl XenServer 10 or later
979 [[6-9]]* | dnl XenServer 6 or later
980 5.[[7-9]]* | dnl XenServer 5.7 or later
981 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
982 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
983 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
984 ;;
985
986 *)
987 AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported. (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
988 ;;
989 esac])
29d935d6 990
643c0c34
BP		 991dnl OVS_CHECK_SPARSE_TARGET
992dnl
993dnl The "cgcc" script from "sparse" isn't very good at detecting the
994dnl target for which the code is being built. This helps it out.
995AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
996 [AC_CACHE_CHECK(
997 [target hint for cgcc],
998 [ac_cv_sparse_target],
999 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
1000 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
1001 [x86_64-*], [ac_cv_sparse_target=x86_64],
1002 [ac_cv_sparse_target=other])])
1003 AS_CASE([$ac_cv_sparse_target],
1004 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
1005 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
1006 [SPARSEFLAGS= CGCCFLAGS=])
1007 AC_SUBST([SPARSEFLAGS])
1008 AC_SUBST([CGCCFLAGS])])
1009
32e96ab7
AZ		 1010dnl OVS_SPARSE_EXTRA_INCLUDES
1011dnl
1012dnl The cgcc script from "sparse" does not search gcc's default
1013dnl search path. Get the default search path from GCC and pass
1014dnl them to sparse.
1015AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
1016 AC_SUBST([SPARSE_EXTRA_INCLUDES],
1017 [`$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 ' ' `] ))
1018
29d935d6
BP		 1019dnl OVS_ENABLE_SPARSE
1020AC_DEFUN([OVS_ENABLE_SPARSE],
643c0c34 1021 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
32e96ab7 1022 AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
372d58a4
BP		 1023 : ${SPARSE=sparse}
1024 AC_SUBST([SPARSE])
1025 AC_CONFIG_COMMANDS_PRE(
d4042a70
BP		 1026 [CC='$(if $(C:0=),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) $(SPARSE_WERROR) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'])
1027
1028 AC_ARG_ENABLE(
1029 [sparse],
1030 [AC_HELP_STRING([--enable-sparse], [Run "sparse" by default])],
1031 [], [enable_sparse=no])
1032 AM_CONDITIONAL([ENABLE_SPARSE_BY_DEFAULT], [test $enable_sparse = yes])])
8a8cd0ac 1033
0eaaacac
FL		 1034dnl OVS_CTAGS_IDENTIFIERS
1035dnl
1036dnl ctags ignores symbols with extras identifiers. This builds a list of
1037dnl specially handled identifiers to be ignored.
1038AC_DEFUN([OVS_CTAGS_IDENTIFIERS],
1039 AC_SUBST([OVS_CTAGS_IDENTIFIERS_LIST],
c9990318 1040 [`printf %s '-I "'; sed -n 's/^#define \(OVS_[A-Z_]\+\)(\.\.\.)$/\1+/p' ${srcdir}/include/openvswitch/compiler.h | tr \\\n ' ' ; printf '"'`] ))
0eaaacac 1041
8a8cd0ac
BP		 1042dnl OVS_PTHREAD_SET_NAME
1043dnl
1044dnl This checks for three known variants of pthreads functions for setting
1045dnl the name of the current thread:
1046dnl
1047dnl glibc: int pthread_setname_np(pthread_t, const char *name);
1048dnl NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
1049dnl FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
1050dnl
1051dnl For glibc and FreeBSD, the arguments are just a thread and its name. For
1052dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
1053dnl provide to it.
1054dnl
1055dnl This macro defines:
1056dnl
1057dnl glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
1058dnl NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
1059dnl FreeBSD: HAVE_PTHREAD_SET_NAME_NP
1060AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
1061 [AC_CHECK_FUNCS([pthread_set_name_np])
1062 if test $ac_cv_func_pthread_set_name_np != yes; then
1063 AC_CACHE_CHECK(
1064 [for pthread_setname_np() variant],
1065 [ovs_cv_pthread_setname_np],
1066 [AC_LINK_IFELSE(
a0903134 1067 [AC_LANG_PROGRAM([#include <pthread.h>
8a8cd0ac 1068 ], [pthread_setname_np(pthread_self(), "name");])],
a0903134 1069 [ovs_cv_pthread_setname_np=glibc],
8a8cd0ac 1070 [AC_LINK_IFELSE(
a0903134 1071 [AC_LANG_PROGRAM([#include <pthread.h>
8a8cd0ac
BP		 1072], [pthread_setname_np(pthread_self(), "%s", "name");])],
1073 [ovs_cv_pthread_setname_np=netbsd],
a0903134 1074 [ovs_cv_pthread_setname_np=none])])])
8a8cd0ac
BP		 1075 case $ovs_cv_pthread_setname_np in # (
1076 glibc)
a0903134
YT		 1077 AC_DEFINE(
1078 [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
1079 [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
1080 ;; # (
8a8cd0ac 1081 netbsd)
a0903134
YT		 1082 AC_DEFINE(
1083 [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
1084 [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
1085 ;;
8a8cd0ac
BP		 1086 esac
1087 fi])
5020f5f0
BP		 1088
1089dnl OVS_CHECK_LINUX_HOST.
1090dnl
1091dnl Checks whether we're building for a Linux host, based on the presence of
1092dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
1093dnl LINUX based on the result.
1094AC_DEFUN([OVS_CHECK_LINUX_HOST],
1095 [AC_CACHE_CHECK(
1096 [whether __linux__ is defined],
1097 [ovs_cv_linux],
1098 [AC_COMPILE_IFELSE(
1099 [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
1100 [ovs_cv_linux=true],
1101 [ovs_cv_linux=false])])
1102 AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])
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