3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
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:
9 # http://www.apache.org/licenses/LICENSE-2.0
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.
18 AC_DEFUN([OVS_ENABLE_WERROR],
21 [AC_HELP_STRING([--enable-Werror], [Add -Werror to CFLAGS])],
22 [], [enable_Werror=no])
23 AC_CONFIG_COMMANDS_PRE(
24 [if test "X$enable_Werror" = Xyes; then
25 OVS_CFLAGS="$OVS_CFLAGS -Werror"
30 dnl Configure linux kernel source tree
31 AC_DEFUN([OVS_CHECK_LINUX], [
33 [AC_HELP_STRING([--with-linux=/path/to/linux],
34 [Specify the Linux kernel build directory])])
35 AC_ARG_WITH([linux-source],
36 [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
37 [Specify the Linux kernel source directory
38 (usually figured out automatically from build
41 # Deprecated equivalents to --with-linux, --with-linux-source.
43 AC_ARG_WITH([l26-source])
45 if test X"$with_linux" != X; then
47 elif test X"$with_l26" != X; then
49 AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
54 if test X"$KBUILD" != X; then
55 if test X"$with_linux_source" != X; then
56 KSRC=$with_linux_source
57 elif test X"$with_l26_source" != X; then
59 AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
63 elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
64 AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
67 if test -n "$KBUILD"; then
68 KBUILD=`eval echo "$KBUILD"`
71 *) KBUILD=`pwd`/$KBUILD ;;
74 # The build directory is what the user provided.
75 # Make sure that it exists.
76 AC_MSG_CHECKING([for Linux build directory])
77 if test -d "$KBUILD"; then
78 AC_MSG_RESULT([$KBUILD])
82 AC_ERROR([source dir $KBUILD doesn't exist])
85 # Debian breaks kernel headers into "source" header and "build" headers.
86 # We want the source headers, but $KBUILD gives us the "build" headers.
87 # Use heuristics to find the source headers.
88 AC_MSG_CHECKING([for Linux source directory])
89 if test -n "$KSRC"; then
90 KSRC=`eval echo "$KSRC"`
93 *) KSRC=`pwd`/$KSRC ;;
95 if test ! -e $KSRC/include/linux/kernel.h; then
96 AC_MSG_ERROR([$KSRC is not a kernel source directory])
100 if test ! -e $KSRC/include/linux/kernel.h; then
101 # Debian kernel build Makefiles tend to include a line of the form:
102 # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
103 # First try to extract the source directory from this line.
104 KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
105 if test ! -e "$KSRC"/include/linux/kernel.h; then
106 # Didn't work. Fall back to name-based heuristics that used to work.
107 case `echo "$KBUILD" | sed 's,/*$,,'` in # (
109 KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
112 KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
117 if test ! -e "$KSRC"/include/linux/kernel.h; then
118 AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
121 AC_MSG_RESULT([$KSRC])
123 AC_MSG_CHECKING([for kernel version])
124 version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
125 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
126 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
127 if test X"$version" = X || test X"$patchlevel" = X; then
128 AC_ERROR([cannot determine kernel version])
129 elif test X"$sublevel" = X; then
130 kversion=$version.$patchlevel
132 kversion=$version.$patchlevel.$sublevel
134 AC_MSG_RESULT([$kversion])
136 if test "$version" -ge 4; then
137 if test "$version" = 4 && test "$patchlevel" -le 3; then
140 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 4.3.x is not supported (please refer to the FAQ for advice)])
142 elif test "$version" = 3 && test "$patchlevel" -ge 10; then
145 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 3.10 or later is required])
147 if (test ! -e "$KBUILD"/include/linux/version.h && \
148 test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
149 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
150 test ! -e "$KBUILD"/include/generated/autoconf.h); then
151 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
153 OVS_CHECK_LINUX_COMPAT
155 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
160 dnl Configure DPDK source tree
161 AC_DEFUN([OVS_CHECK_DPDK], [
163 [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
164 [Specify the DPDK build directory])],
167 AC_MSG_CHECKING([whether dpdk datapath is enabled])
168 if test "$have_dpdk" != true || test "$with_dpdk" = no; then
175 DPDK_AUTO_DISCOVER="true"
176 DPDK_INCLUDE="/usr/local/include/dpdk -I/usr/include/dpdk"
179 DPDK_AUTO_DISCOVER="false"
180 DPDK_INCLUDE="$with_dpdk/include"
181 # If 'with_dpdk' is passed install directory, point to headers
182 # installed in $DESTDIR/$prefix/include/dpdk
183 AC_CHECK_FILE([$DPDK_INCLUDE/rte_config.h], [],
184 [AC_CHECK_FILE([$DPDK_INCLUDE/dpdk/rte_config.h],
185 [DPDK_INCLUDE=$DPDK_INCLUDE/dpdk], [])])
186 DPDK_LIB_DIR="$with_dpdk/lib"
193 ovs_save_CFLAGS="$CFLAGS"
194 ovs_save_LDFLAGS="$LDFLAGS"
195 CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
196 if test "$DPDK_AUTO_DISCOVER" = "false"; then
197 LDFLAGS="$LDFLAGS -L${DPDK_LIB_DIR}"
203 #include <rte_config.h>
204 #if !RTE_LIBRTE_VHOST_USER
209 [AC_DEFINE([VHOST_CUSE], [1], [DPDK vhost-cuse support enabled, vhost-user disabled.])
210 DPDK_EXTRA_LIB="-lfuse"])
212 AC_SEARCH_LIBS([get_mempolicy],[numa],[],[AC_MSG_ERROR([unable to find libnuma, install the dependency package])])
214 # On some systems we have to add -ldl to link with dpdk
216 # This code, at first, tries to link without -ldl (""),
217 # then adds it and tries again.
218 # Before each attempt the search cache must be unset,
219 # otherwise autoconf will stick with the old result
223 for extras in "" "-ldl"; do
224 LIBS="$DPDK_LIB $extras $save_LIBS $DPDK_EXTRA_LIB -lnuma"
226 [AC_LANG_PROGRAM([#include <rte_config.h>
227 #include <rte_eal.h>],
228 [int rte_argc; char ** rte_argv;
229 rte_eal_init(rte_argc, rte_argv);])],
230 [DPDKLIB_FOUND=true])
231 if $DPDKLIB_FOUND; then
236 # If linking unsuccessful
237 if test "$DPDKLIB_FOUND" = "false" ; then
238 if $DPDK_AUTO_DISCOVER; then
239 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])
241 AC_MSG_ERROR([Could not find DPDK libraries in $DPDK_LIB_DIR])
244 CFLAGS="$ovs_save_CFLAGS"
245 LDFLAGS="$ovs_save_LDFLAGS"
246 if test "$DPDK_AUTO_DISCOVER" = "false"; then
247 OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
249 OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE"
250 OVS_ENABLE_OPTION([-mssse3])
252 # DPDK pmd drivers are not linked unless --whole-archive is used.
254 # This happens because the rest of the DPDK code doesn't use any symbol in
255 # the pmd driver objects, and the drivers register themselves using an
256 # __attribute__((constructor)) function.
258 # These options are specified inside a single -Wl directive to prevent
259 # autotools from reordering them.
260 DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
261 AC_SUBST([DPDK_vswitchd_LDFLAGS])
262 AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
265 AM_CONDITIONAL([DPDK_NETDEV], test "$DPDKLIB_FOUND" = true)
268 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
270 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
271 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
272 dnl <REGEX> translated to uppercase.
273 AC_DEFUN([OVS_GREP_IFELSE], [
274 AC_MSG_CHECKING([whether $2 matches in $1])
276 grep '$2' $1 >/dev/null 2>&1
281 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
288 AC_MSG_ERROR([grep exited with status $status])
292 AC_MSG_RESULT([file not found])
297 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
299 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
300 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
301 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
302 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
303 dnl translated to uppercase.
304 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
305 AC_MSG_CHECKING([whether $2 has member $3 in $1])
307 awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
312 m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
319 AC_MSG_ERROR([grep exited with status $status])
323 AC_MSG_RESULT([file not found])
328 dnl OVS_FIND_PARAM_IFELSE(FILE, FUNCTION, REGEX, [IF-MATCH], [IF-NO-MATCH])
330 dnl Looks for FUNCTION in FILE. If it is found, greps for REGEX within
331 dnl the function signature starting from the line matching FUNCTION
332 dnl and ending with the line containing the closing parenthesis. If
333 dnl this is successful, runs IF-MATCH, otherwise IF_NO_MATCH. If
334 dnl IF-MATCH is empty then it defines to
335 dnl OVS_DEFINE(HAVE_<FUNCTION>_WITH_<REGEX>), with <FUNCTION> and
336 dnl <REGEX> translated to uppercase.
337 AC_DEFUN([OVS_FIND_PARAM_IFELSE], [
338 AC_MSG_CHECKING([whether $2 has parameter $3 in $1])
340 awk '/$2[[ \t\n]]*\(/,/\)/' $1 2>/dev/null | grep '$3' >/dev/null
345 m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
352 AC_MSG_ERROR([grep exited with status $status])
356 AC_MSG_RESULT([file not found])
363 dnl Defines NAME to 1 in kcompat.h.
364 AC_DEFUN([OVS_DEFINE], [
365 echo '#define $1 1' >> datapath/linux/kcompat.h.new
368 dnl OVS_CHECK_LINUX_COMPAT
370 dnl Runs various Autoconf checks on the Linux kernel source in
371 dnl the directory in $KBUILD.
372 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
373 rm -f datapath/linux/kcompat.h.new
374 mkdir -p datapath/linux
375 : > datapath/linux/kcompat.h.new
377 echo '#include <linux/version.h>
378 #ifndef RHEL_RELEASE_CODE
379 #define RHEL_RELEASE_CODE 0
380 #define RHEL_RELEASE_VERSION(a, b) 0
381 #endif' >> datapath/linux/kcompat.h.new
383 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
384 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
386 OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
387 [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
388 OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
390 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
391 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
393 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
394 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
396 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
397 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
398 OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
399 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
400 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
402 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
403 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
404 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
405 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
406 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
407 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
409 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
410 [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
411 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_defrag.*net],
412 [OVS_DEFINE([HAVE_IP_DEFRAG_TAKES_NET])])
413 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/ip.h],
414 [ip_do_fragment], [net],
415 [OVS_DEFINE([HAVE_IP_DO_FRAGMENT_TAKES_NET])])
416 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
418 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
419 [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
420 OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
421 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
422 [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
423 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
424 [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
425 OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
426 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
428 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
430 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
432 OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
433 [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
435 OVS_GREP_IFELSE([$KSRC/include/net/dst_metadata.h], [metadata_dst])
437 OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
438 [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
439 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_fill_metadata_dst])
440 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
441 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
442 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
443 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
444 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
445 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
446 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
447 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
448 dnl Ubuntu kernel 3.13 has defined this struct but not used for netdev->tstats.
449 dnl So check type of tstats.
450 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats.*tstats],
451 [OVS_DEFINE([HAVE_PCPU_SW_NETSTATS])])
452 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
453 [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
454 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
455 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
456 [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
457 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
459 OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
460 OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
461 OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
462 [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
463 OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
464 [fragment.*sock], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
466 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
467 [nf_ct_tmpl_alloc], [nf_conntrack_zone],
468 [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
469 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
470 [nf_ct_get_tuplepr], [struct.net],
471 [OVS_DEFINE([HAVE_NF_CT_GET_TUPLEPR_TAKES_STRUCT_NET])])
472 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
474 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
476 OVS_FIND_PARAM_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
477 [nf_connlabels_get], [int bit],
478 [OVS_DEFINE([HAVE_NF_CONNLABELS_GET_TAKES_BIT])])
479 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
480 [nf_ct_frag6_consume_orig])
481 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
482 [nf_ct_frag6_output])
483 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_ct_nat_ext_add])
484 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_nat.h], [nf_nat_alloc_null_binding])
485 OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_seqadj.h], [nf_ct_seq_adjust])
487 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
488 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
490 OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
491 OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
492 OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
493 [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
494 OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
496 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
497 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
498 [rcu_read_lock_held])])
499 OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
501 # Check for the proto_data_valid member in struct sk_buff. The [^@]
502 # is necessary because some versions of this header remove the
503 # member but retain the kerneldoc comment that describes it (which
504 # starts with @). The brackets must be doubled because of m4
506 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
507 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
508 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
509 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
510 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_mac_header])
511 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_network_header])
512 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
513 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_scrub_packet.*xnet],
514 [OVS_DEFINE([HAVE_SKB_SCRUB_PACKET_XNET])])
515 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
516 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
517 [OVS_DEFINE([HAVE_U16_RXHASH])])
518 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
519 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
520 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
521 [skb_copy_from_linear_data_offset])
522 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
523 [skb_reset_tail_pointer])
524 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
525 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
526 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
527 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
528 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
529 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
530 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
531 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
532 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
533 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
534 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash(],
535 [OVS_DEFINE([HAVE_SKB_GET_HASH])])
536 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
537 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
538 [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
539 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
540 [OVS_DEFINE([HAVE_L4_RXHASH])])
541 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
542 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
543 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
545 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
546 [OVS_DEFINE([HAVE_BOOL_TYPE])])
547 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
548 [OVS_DEFINE([HAVE_CSUM_TYPES])])
549 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
550 [OVS_DEFINE([HAVE_CSUM_TYPES])])
552 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
553 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
555 OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
556 OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
558 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
559 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
560 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
561 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_new_unicast])
562 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
563 [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
564 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
565 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
566 [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
568 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
569 [genl_multicast_group], [id])
570 OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
572 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
573 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
574 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
575 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
576 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
577 OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
578 [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
579 OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
580 [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
582 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
583 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
584 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
585 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
586 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
587 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
588 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
589 OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
590 [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
592 OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
594 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
595 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
596 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
597 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
598 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
600 OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
602 OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
603 [OVS_DEFINE([HAVE_VXLAN_METADATA])])
604 OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [VXLAN_HF_RCO])
605 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
606 [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
607 [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
608 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
609 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_set_csum])
610 OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
611 OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [ipv6_v6only],
612 [OVS_DEFINE([HAVE_UDP_TUNNEL_IPV6])])
614 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
615 [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
616 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
617 [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
619 OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
620 [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
622 if cmp -s datapath/linux/kcompat.h.new \
623 datapath/linux/kcompat.h >/dev/null 2>&1; then
624 rm datapath/linux/kcompat.h.new
626 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
630 dnl Checks for net/if_packet.h.
631 AC_DEFUN([OVS_CHECK_IF_PACKET],
632 [AC_CHECK_HEADER([net/if_packet.h],
633 [HAVE_IF_PACKET=yes],
635 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
636 if test "$HAVE_IF_PACKET" = yes; then
637 AC_DEFINE([HAVE_IF_PACKET], [1],
638 [Define to 1 if net/if_packet.h is available.])
641 dnl Checks for net/if_dl.h.
643 dnl (We use this as a proxy for checking whether we're building on FreeBSD
645 AC_DEFUN([OVS_CHECK_IF_DL],
646 [AC_CHECK_HEADER([net/if_dl.h],
649 AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
650 if test "$HAVE_IF_DL" = yes; then
651 AC_DEFINE([HAVE_IF_DL], [1],
652 [Define to 1 if net/if_dl.h is available.])
654 # On these platforms we use libpcap to access network devices.
655 AC_SEARCH_LIBS([pcap_open_live], [pcap])
658 dnl Checks for buggy strtok_r.
660 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
661 dnl with optimization that can cause segfaults:
663 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
664 AC_DEFUN([OVS_CHECK_STRTOK_R],
666 [whether strtok_r macro segfaults on some inputs],
667 [ovs_cv_strtok_r_bug],
669 [AC_LANG_PROGRAM([#include <stdio.h>
672 [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
673 /* Assume bug is present, because relatively minor
674 changes in compiler settings (e.g. optimization
675 level) can make it crop up. */
678 char string[] = ":::";
679 char *save_ptr = (char *) 0xc0ffee;
680 char *token1, *token2;
681 token1 = strtok_r(string, ":", &save_ptr);
682 token2 = strtok_r(NULL, ":", &save_ptr);
683 freopen ("/dev/null", "w", stdout);
684 printf ("%s %s\n", token1, token2);
688 [ovs_cv_strtok_r_bug=no],
689 [ovs_cv_strtok_r_bug=yes],
690 [ovs_cv_strtok_r_bug=yes])])
691 if test $ovs_cv_strtok_r_bug = yes; then
692 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
693 [Define if strtok_r macro segfaults on some inputs])
697 dnl ----------------------------------------------------------------------
698 dnl These macros are from GNU PSPP, with the following original license:
699 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
700 dnl This file is free software; the Free Software Foundation
701 dnl gives unlimited permission to copy and/or distribute it,
702 dnl with or without modifications, as long as this notice is preserved.
704 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
705 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
706 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
707 [ovs_save_CFLAGS="$CFLAGS"
708 dnl Include -Werror in the compiler options, because without -Werror
709 dnl clang's GCC-compatible compiler driver does not return a failure
710 dnl exit status even though it complains about options it does not
713 dnl Also, check stderr as gcc exits with status 0 for options
714 dnl rejected at getopt level.
716 dnl % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
717 dnl gcc: unrecognized option '-Qunused-arguments'
720 CFLAGS="$CFLAGS $WERROR $1"
721 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [if test -s conftest.err && grep "unrecognized option" conftest.err; then ovs_cv_name[]=no; else ovs_cv_name[]=yes; fi], [ovs_cv_name[]=no])
722 CFLAGS="$ovs_save_CFLAGS"])
723 if test $ovs_cv_name = yes; then
724 m4_if([$2], [], [:], [$2])
726 m4_if([$3], [], [:], [$3])
732 dnl Check whether the C compiler accepts -Werror.
733 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
734 AC_DEFUN([OVS_CHECK_WERROR],
736 _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
738 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
739 dnl Check whether the given C compiler OPTION is accepted.
740 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
741 AC_DEFUN([OVS_CHECK_CC_OPTION],
742 [AC_REQUIRE([OVS_CHECK_WERROR])
743 _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
745 dnl OVS_ENABLE_OPTION([OPTION])
746 dnl Check whether the given C compiler OPTION is accepted.
747 dnl If so, add it to WARNING_FLAGS.
748 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
749 AC_DEFUN([OVS_ENABLE_OPTION],
750 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
751 AC_SUBST([WARNING_FLAGS])])
753 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
754 dnl Check whether the given C compiler OPTION is accepted.
755 dnl If so, enable the given Automake CONDITIONAL.
757 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
758 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
759 [OVS_CHECK_CC_OPTION(
760 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
761 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
762 dnl ----------------------------------------------------------------------
764 dnl Check for too-old XenServer.
765 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
766 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
767 [if test -e /etc/redhat-release; then
768 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
770 if test -z "$ovs_cv_xsversion"; then
771 ovs_cv_xsversion=none
773 case $ovs_cv_xsversion in
777 [[1-9]][[0-9]]* | dnl XenServer 10 or later
778 [[6-9]]* | dnl XenServer 6 or later
779 5.[[7-9]]* | dnl XenServer 5.7 or later
780 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
781 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
782 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
786 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.)])
790 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
792 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
793 dnl Runs 'if-true' if so, 'if-false' otherwise.
794 AC_DEFUN([OVS_CHECK_MAKE_IF],
796 [whether ${MAKE-make} has GNU make \$(if) extension],
797 [ovs_cv_gnu_make_if],
798 [cat <<'EOF' > conftest.mk
800 echo $(if x,y,z) > conftest.out
804 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
805 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
806 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
807 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
808 result=`cat conftest.out`
809 rm -f conftest.mk conftest.out
810 if test "X$result" = "Xy"; then
811 ovs_cv_gnu_make_if=yes
813 ovs_cv_gnu_make_if=no
816 dnl OVS_CHECK_GNU_MAKE
818 dnl Checks whether make is GNU make (because Linux kernel Makefiles
819 dnl only work with GNU make).
820 AC_DEFUN([OVS_CHECK_GNU_MAKE],
822 [whether ${MAKE-make} is GNU make],
825 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
826 ${MAKE-make} --version >conftest.out 2>&1
827 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
828 result=`cat conftest.out`
829 rm -f conftest.mk conftest.out
832 GNU*) ovs_cv_gnu_make=yes ;; # (
833 *) ovs_cv_gnu_make=no ;;
835 AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
837 dnl OVS_CHECK_SPARSE_TARGET
839 dnl The "cgcc" script from "sparse" isn't very good at detecting the
840 dnl target for which the code is being built. This helps it out.
841 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
843 [target hint for cgcc],
844 [ac_cv_sparse_target],
845 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
846 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
847 [x86_64-*], [ac_cv_sparse_target=x86_64],
848 [ac_cv_sparse_target=other])])
849 AS_CASE([$ac_cv_sparse_target],
850 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
851 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
852 [SPARSEFLAGS= CGCCFLAGS=])
853 AC_SUBST([SPARSEFLAGS])
854 AC_SUBST([CGCCFLAGS])])
856 dnl OVS_SPARSE_EXTRA_INCLUDES
858 dnl The cgcc script from "sparse" does not search gcc's default
859 dnl search path. Get the default search path from GCC and pass
861 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
862 AC_SUBST([SPARSE_EXTRA_INCLUDES],
863 [`$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 ' ' `] ))
865 dnl OVS_ENABLE_SPARSE
866 AC_DEFUN([OVS_ENABLE_SPARSE],
867 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
868 AC_REQUIRE([OVS_CHECK_MAKE_IF])
869 AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
872 AC_CONFIG_COMMANDS_PRE(
873 [if test $ovs_cv_gnu_make_if = yes; then
874 CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
877 dnl OVS_PTHREAD_SET_NAME
879 dnl This checks for three known variants of pthreads functions for setting
880 dnl the name of the current thread:
882 dnl glibc: int pthread_setname_np(pthread_t, const char *name);
883 dnl NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
884 dnl FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
886 dnl For glibc and FreeBSD, the arguments are just a thread and its name. For
887 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
890 dnl This macro defines:
892 dnl glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
893 dnl NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
894 dnl FreeBSD: HAVE_PTHREAD_SET_NAME_NP
895 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
896 [AC_CHECK_FUNCS([pthread_set_name_np])
897 if test $ac_cv_func_pthread_set_name_np != yes; then
899 [for pthread_setname_np() variant],
900 [ovs_cv_pthread_setname_np],
902 [AC_LANG_PROGRAM([#include <pthread.h>
903 ], [pthread_setname_np(pthread_self(), "name");])],
904 [ovs_cv_pthread_setname_np=glibc],
906 [AC_LANG_PROGRAM([#include <pthread.h>
907 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
908 [ovs_cv_pthread_setname_np=netbsd],
909 [ovs_cv_pthread_setname_np=none])])])
910 case $ovs_cv_pthread_setname_np in # (
913 [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
914 [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
918 [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
919 [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
924 dnl OVS_CHECK_LINUX_HOST.
926 dnl Checks whether we're building for a Linux host, based on the presence of
927 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
928 dnl LINUX based on the result.
929 AC_DEFUN([OVS_CHECK_LINUX_HOST],
931 [whether __linux__ is defined],
934 [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
936 [ovs_cv_linux=false])])
937 AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])