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datapath: move make_writable helper into common code
[mirror_ovs.git] / acinclude.m4
CommitLineData
064af421
BP		 1# -*- autoconf -*-
2
5020f5f0 3# Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 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"
a64e37a1
BP		 26 fi])])
27
e3438006 28dnl OVS_CHECK_LINUX
064af421
BP		 29dnl
30dnl Configure linux kernel source tree
e3438006 31AC_DEFUN([OVS_CHECK_LINUX], [
8a2d6596
BP		 32 AC_ARG_WITH([linux],
33 [AC_HELP_STRING([--with-linux=/path/to/linux],
34 [Specify the Linux kernel build directory])])
35 AC_ARG_WITH([linux-source],
36 [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
37 [Specify the Linux kernel source directory
a0903134
YT		 38 (usually figured out automatically from build
39 directory)])])
8a2d6596
BP		 40
41 # Deprecated equivalents to --with-linux, --with-linux-source.
42 AC_ARG_WITH([l26])
43 AC_ARG_WITH([l26-source])
44
45 if test X"$with_linux" != X; then
46 KBUILD=$with_linux
47 elif test X"$with_l26" != X; then
48 KBUILD=$with_l26
49 AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
50 else
51 KBUILD=
52 fi
53
54 if test X"$KBUILD" != X; then
55 if test X"$with_linux_source" != X; then
56 KSRC=$with_linux_source
57 elif test X"$with_l26_source" != X; then
58 KSRC=$with_l26_source
59 AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
0a89c170
BP		 60 else
61 KSRC=
8a2d6596
BP		 62 fi
63 elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
64 AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
65 fi
66
e3438006
BP		 67 if test -n "$KBUILD"; then
68 KBUILD=`eval echo "$KBUILD"`
69 case $KBUILD in
0b6d72fc 70 /*) ;;
e3438006 71 *) KBUILD=`pwd`/$KBUILD ;;
0b6d72fc 72 esac
064af421 73
7c9e113b
BP		 74 # The build directory is what the user provided.
75 # Make sure that it exists.
8a2d6596 76 AC_MSG_CHECKING([for Linux build directory])
e3438006 77 if test -d "$KBUILD"; then
a0903134
YT		 78 AC_MSG_RESULT([$KBUILD])
79 AC_SUBST(KBUILD)
064af421 80 else
a0903134
YT		 81 AC_MSG_RESULT([no])
82 AC_ERROR([source dir $KBUILD doesn't exist])
064af421
BP		 83 fi
84
7c9e113b 85 # Debian breaks kernel headers into "source" header and "build" headers.
e3438006 86 # We want the source headers, but $KBUILD gives us the "build" headers.
7c9e113b 87 # Use heuristics to find the source headers.
8a2d6596 88 AC_MSG_CHECKING([for Linux source directory])
e3438006
BP		 89 if test -n "$KSRC"; then
90 KSRC=`eval echo "$KSRC"`
91 case $KSRC in
f5fb5de6 92 /*) ;;
e3438006 93 *) KSRC=`pwd`/$KSRC ;;
b57f675c 94 esac
e3438006 95 if test ! -e $KSRC/include/linux/kernel.h; then
53319f95 96 AC_MSG_ERROR([$KSRC is not a kernel source directory])
f5fb5de6
BP		 97 fi
98 else
e3438006
BP		 99 KSRC=$KBUILD
100 if test ! -e $KSRC/include/linux/kernel.h; then
fe0731b1
BP		 101 # Debian kernel build Makefiles tend to include a line of the form:
102 # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
103 # First try to extract the source directory from this line.
104 KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
105 if test ! -e "$KSRC"/include/linux/kernel.h; then
106 # Didn't work. Fall back to name-based heuristics that used to work.
107 case `echo "$KBUILD" | sed 's,/*$,,'` in # (
108 */build)
109 KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
110 ;; # (
111 *)
112 KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
113 ;;
114 esac
115 fi
f5fb5de6 116 fi
fe0731b1 117 if test ! -e "$KSRC"/include/linux/kernel.h; then
8a2d6596 118 AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
7c9e113b
BP		 119 fi
120 fi
e3438006 121 AC_MSG_RESULT([$KSRC])
7c9e113b
BP		 122
123 AC_MSG_CHECKING([for kernel version])
71fe9970 124 version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
e3438006
BP		 125 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
126 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
71fe9970 127 if test X"$version" = X || test X"$patchlevel" = X; then
7c9e113b 128 AC_ERROR([cannot determine kernel version])
71fe9970
BP		 129 elif test X"$sublevel" = X; then
130 kversion=$version.$patchlevel
131 else
132 kversion=$version.$patchlevel.$sublevel
7c9e113b 133 fi
71fe9970
BP		 134 AC_MSG_RESULT([$kversion])
135
136 if test "$version" -ge 3; then
4510f853 137 if test "$version" = 3 && test "$patchlevel" -le 18; then
d76aabea
PS		 138 : # Linux 3.x
139 else
4510f853 140 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 3.18.x is not supported (please refer to the FAQ for advice)])
d76aabea 141 fi
71fe9970 142 else
d76aabea
PS		 143 if test "$version" -le 1 || test "$patchlevel" -le 5 || test "$sublevel" -le 31; then
144 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6.32 or later is required])
7c9e113b 145 else
d76aabea 146 : # Linux 2.6.x
7c9e113b 147 fi
064af421 148 fi
2520f452
IY		 149 if (test ! -e "$KBUILD"/include/linux/version.h && \
150 test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
e3438006
BP		 151 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
152 test ! -e "$KBUILD"/include/generated/autoconf.h); then
a0903134 153 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
064af421 154 fi
e3438006 155 OVS_CHECK_LINUX_COMPAT
064af421 156 fi
e3438006 157 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
064af421
BP		 158])
159
8a9562d2
PS		 160dnl OVS_CHECK_DPDK
161dnl
162dnl Configure DPDK source tree
163AC_DEFUN([OVS_CHECK_DPDK], [
164 AC_ARG_WITH([dpdk],
165 [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
e2e54517 166 [Specify the DPDK build directory])])
8a9562d2
PS		 167
168 if test X"$with_dpdk" != X; then
169 RTE_SDK=$with_dpdk
170
171 DPDK_INCLUDE=$RTE_SDK/include
172 DPDK_LIB_DIR=$RTE_SDK/lib
d7310583 173 DPDK_LIB=-lintel_dpdk
8a9562d2 174
95626395
TG		 175 ovs_save_CFLAGS="$CFLAGS"
176 ovs_save_LDFLAGS="$LDFLAGS"
c1223b11
DDP		 177 LDFLAGS="$LDFLAGS -L$DPDK_LIB_DIR"
178 CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
179
180 # On some systems we have to add -ldl to link with dpdk
181 #
182 # This code, at first, tries to link without -ldl (""),
183 # then adds it and tries again.
184 # Before each attempt the search cache must be unset,
185 # otherwise autoconf will stick with the old result
186
187 found=false
188 save_LIBS=$LIBS
189 for extras in "" "-ldl"; do
d7310583 190 LIBS="$DPDK_LIB $extras $save_LIBS"
c1223b11
DDP		 191 AC_LINK_IFELSE(
192 [AC_LANG_PROGRAM([#include <rte_config.h>
193 #include <rte_eal.h>],
194 [int rte_argc; char ** rte_argv;
195 rte_eal_init(rte_argc, rte_argv);])],
196 [found=true])
197 if $found; then
198 break
199 fi
200 done
201 if $found; then :; else
202 AC_MSG_ERROR([cannot link with dpdk])
203 fi
95626395
TG		 204 CFLAGS="$ovs_save_CFLAGS"
205 LDFLAGS="$ovs_save_LDFLAGS"
206 OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
207 OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE"
8a9562d2 208
b35839f3 209 # DPDK 1.7 pmd drivers are not linked unless --whole-archive is used.
d7310583
DDP		 210 #
211 # This happens because the rest of the DPDK code doesn't use any symbol in
212 # the pmd driver objects, and the drivers register themselves using an
213 # __attribute__((constructor)) function.
214 #
215 # These options are specified inside a single -Wl directive to prevent
216 # autotools from reordering them.
9475dfeb
DDP		 217 DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
218 AC_SUBST([DPDK_vswitchd_LDFLAGS])
8a9562d2
PS		 219 AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
220 else
221 RTE_SDK=
222 fi
223
224 AM_CONDITIONAL([DPDK_NETDEV], test -n "$RTE_SDK")
225])
226
8828e5c7 227dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
064af421
BP		 228dnl
229dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
8828e5c7
BP		 230dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
231dnl <REGEX> translated to uppercase.
064af421
BP		 232AC_DEFUN([OVS_GREP_IFELSE], [
233 AC_MSG_CHECKING([whether $2 matches in $1])
7507ec48
JG		 234 if test -f $1; then
235 grep '$2' $1 >/dev/null 2>&1
236 status=$?
237 case $status in
238 0)
239 AC_MSG_RESULT([yes])
8828e5c7 240 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
7507ec48
JG		 241 ;;
242 1)
243 AC_MSG_RESULT([no])
244 $4
245 ;;
246 *)
247 AC_MSG_ERROR([grep exited with status $status])
248 ;;
249 esac
250 else
251 AC_MSG_RESULT([file not found])
252 $4
253 fi
064af421
BP		 254])
255
256dnl OVS_DEFINE(NAME)
257dnl
258dnl Defines NAME to 1 in kcompat.h.
259AC_DEFUN([OVS_DEFINE], [
22bcc0e7 260 echo '#define $1 1' >> datapath/linux/kcompat.h.new
064af421
BP		 261])
262
064af421 263AC_DEFUN([OVS_CHECK_LOG2_H], [
e3438006
BP		 264 AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
265 if test -e $KSRC/include/linux/log2.h; then
064af421
BP		 266 AC_MSG_RESULT([yes])
267 OVS_DEFINE([HAVE_LOG2_H])
268 else
269 AC_MSG_RESULT([no])
270 fi
271])
272
e3438006 273dnl OVS_CHECK_LINUX_COMPAT
064af421
BP		 274dnl
275dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
e3438006
BP		 276dnl the directory in $KBUILD.
277AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
22bcc0e7
JG		 278 rm -f datapath/linux/kcompat.h.new
279 mkdir -p datapath/linux
280 : > datapath/linux/kcompat.h.new
4aa13c0c 281
e3438006 282 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
25fb3596
JG		 283 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
284
e3438006 285 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
4303ec34 286 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
705e9260 287 OVS_GREP_IFELSE([$KSRC/include/linux/hash.h], [fast_hash_ops])
4aa13c0c 288
d923a695 289 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
e2f3178f 290 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
d923a695
JG		 291
292 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
293
e3438006 294 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
2ea82414
PS		 295 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
296 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
4aa13c0c 297
e3438006
BP		 298 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
299 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
300 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
42d5dd95
TG		 301 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
302 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
d1890de5 303 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
e2f3178f
PK		 304 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
305
306 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
4aa13c0c 307
e3438006
BP		 308 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
309 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
cf6cb3a2 310 [rcu_read_lock_held])])
8fa52250 311 OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
cf6cb3a2 312
6a33828d
BP		 313 # Check for the proto_data_valid member in struct sk_buff. The [^@]
314 # is necessary because some versions of this header remove the
315 # member but retain the kerneldoc comment that describes it (which
316 # starts with @). The brackets must be doubled because of m4
317 # quoting rules.
e3438006 318 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
6a33828d 319 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
60c4904f 320 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
5640cbd8
JG		 321 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
322 [OVS_DEFINE([HAVE_U16_RXHASH])])
e3438006 323 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
85444c3f 324 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
e3438006 325 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
8828e5c7 326 [skb_copy_from_linear_data_offset])
b9c15df9
PS		 327 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
328 [skb_reset_tail_pointer])
e3438006
BP		 329 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
330 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
4aa13c0c 331 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
e3438006 332 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
d31f1109 333 [OVS_DEFINE([HAVE_ICMP6_HDR])])
e3438006 334 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
4aa13c0c 335 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
e3438006 336 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
6c4ea27c 337 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
da4bbeb7 338 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
0aa6fda7 339 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
d923a695 340 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
dc0d542d 341 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
1edc458d 342 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
e2f3178f
PK		 343 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
344 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
705e9260
PS		 345 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
346 [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
9bbf88b2 347 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
5cce04b6 348 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
4aa13c0c 349
e3438006 350 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
4aa13c0c 351 [OVS_DEFINE([HAVE_BOOL_TYPE])])
e3438006 352 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
e215ebca 353 [OVS_DEFINE([HAVE_CSUM_TYPES])])
8dbe1f9f
PS		 354 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
355 [OVS_DEFINE([HAVE_CSUM_TYPES])])
4aa13c0c 356
e3438006
BP		 357 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
358 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
4aa13c0c 359
114fce23
SG		 360 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
361 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
14002a59 362 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
705e9260 363 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_new_unicast])
cc1d0dea 364 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
705e9260
PS		 365 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
366 OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [iptunnel_xmit.*net],
367 [OVS_DEFINE([HAVE_IPTUNNEL_XMIT_NET])])
8abaa53c 368 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
e3438006 369 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
42d5dd95
TG		 370 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
371 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
372 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
e3438006 373 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
0fcc086d 374 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
4aa13c0c 375
c4e976db
JG		 376 OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
377
e3438006 378 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
431488e6 379 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
1f649f1c 380 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
17e3889f
TG		 381 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
382
431488e6 383
09f27436
JG		 384 OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
385
f285d3e7
TG		 386 OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
387 [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
06021dcb 388 OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_xmit_skb])
f6a0c895
TG		 389 OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [bool xnet],
390 [OVS_DEFINE([HAVE_VXLAN_XMIT_SKB_XNET_ARG])])
391 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
392 [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])
393 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df:1],
394 [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
395 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
396 [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
f285d3e7 397
064af421 398 OVS_CHECK_LOG2_H
4aa13c0c 399
22bcc0e7
JG		 400 if cmp -s datapath/linux/kcompat.h.new \
401 datapath/linux/kcompat.h >/dev/null 2>&1; then
402 rm datapath/linux/kcompat.h.new
064af421 403 else
22bcc0e7 404 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
064af421
BP		 405 fi
406])
407
408dnl Checks for net/if_packet.h.
409AC_DEFUN([OVS_CHECK_IF_PACKET],
410 [AC_CHECK_HEADER([net/if_packet.h],
411 [HAVE_IF_PACKET=yes],
412 [HAVE_IF_PACKET=no])
413 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
414 if test "$HAVE_IF_PACKET" = yes; then
415 AC_DEFINE([HAVE_IF_PACKET], [1],
416 [Define to 1 if net/if_packet.h is available.])
417 fi])
418
f6eb6b20 419dnl Checks for net/if_dl.h.
d30e714c 420dnl
d23fa2ed
YT		 421dnl (We use this as a proxy for checking whether we're building on FreeBSD
422dnl or NetBSD.)
9360d9b7
EM		 423AC_DEFUN([OVS_CHECK_IF_DL],
424 [AC_CHECK_HEADER([net/if_dl.h],
425 [HAVE_IF_DL=yes],
426 [HAVE_IF_DL=no])
427 AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
428 if test "$HAVE_IF_DL" = yes; then
429 AC_DEFINE([HAVE_IF_DL], [1],
430 [Define to 1 if net/if_dl.h is available.])
d30e714c 431
d23fa2ed 432 # On these platforms we use libpcap to access network devices.
d30e714c 433 AC_SEARCH_LIBS([pcap_open_live], [pcap])
9360d9b7
EM		 434 fi])
435
e50097d2
BP		 436dnl Checks for buggy strtok_r.
437dnl
438dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
439dnl with optimization that can cause segfaults:
440dnl
441dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
442AC_DEFUN([OVS_CHECK_STRTOK_R],
443 [AC_CACHE_CHECK(
444 [whether strtok_r macro segfaults on some inputs],
445 [ovs_cv_strtok_r_bug],
446 [AC_RUN_IFELSE(
447 [AC_LANG_PROGRAM([#include <stdio.h>
448 #include <string.h>
449 ],
450 [[char string[] = ":::";
451 char *save_ptr = (char *) 0xc0ffee;
452 char *token1, *token2;
453 token1 = strtok_r(string, ":", &save_ptr);
454 token2 = strtok_r(NULL, ":", &save_ptr);
5819a7cd 455 freopen ("/dev/null", "w", stdout);
e50097d2
BP		 456 printf ("%s %s\n", token1, token2);
457 return 0;
458 ]])],
459 [ovs_cv_strtok_r_bug=no],
460 [ovs_cv_strtok_r_bug=yes],
461 [ovs_cv_strtok_r_bug=yes])])
462 if test $ovs_cv_strtok_r_bug = yes; then
463 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
464 [Define if strtok_r macro segfaults on some inputs])
465 fi
466])
467
064af421
BP		 468dnl ----------------------------------------------------------------------
469dnl These macros are from GNU PSPP, with the following original license:
470dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
471dnl This file is free software; the Free Software Foundation
472dnl gives unlimited permission to copy and/or distribute it,
473dnl with or without modifications, as long as this notice is preserved.
474
50194820 475AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
7c96151e 476 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
064af421
BP		 477 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
478 [ovs_save_CFLAGS="$CFLAGS"
50194820
BP		 479 dnl Include -Werror in the compiler options, because without -Werror
480 dnl clang's GCC-compatible compiler driver does not return a failure
481 dnl exit status even though it complains about options it does not
482 dnl understand.
483 CFLAGS="$CFLAGS $WERROR $1"
064af421
BP		 484 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
485 CFLAGS="$ovs_save_CFLAGS"])
486 if test $ovs_cv_name = yes; then
83f6c050 487 m4_if([$2], [], [:], [$2])
064af421
BP		 488 else
489 m4_if([$3], [], [:], [$3])
490 fi
491])
492
50194820
BP		 493dnl OVS_CHECK_WERROR
494dnl
495dnl Check whether the C compiler accepts -Werror.
496dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
497AC_DEFUN([OVS_CHECK_WERROR],
498 [WERROR=
499 _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
500
501dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
502dnl Check whether the given C compiler OPTION is accepted.
503dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
504AC_DEFUN([OVS_CHECK_CC_OPTION],
505 [AC_REQUIRE([OVS_CHECK_WERROR])
506 _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
507
064af421
BP		 508dnl OVS_ENABLE_OPTION([OPTION])
509dnl Check whether the given C compiler OPTION is accepted.
d161c099 510dnl If so, add it to WARNING_FLAGS.
064af421
BP		 511dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
512AC_DEFUN([OVS_ENABLE_OPTION],
d161c099
BP		 513 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
514 AC_SUBST([WARNING_FLAGS])])
c72e245a
BP		 515
516dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
517dnl Check whether the given C compiler OPTION is accepted.
518dnl If so, enable the given Automake CONDITIONAL.
519
520dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
521AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
522 [OVS_CHECK_CC_OPTION(
523 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
524 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
064af421 525dnl ----------------------------------------------------------------------
ed2d4f6a
BP		 526
527dnl Check for too-old XenServer.
528AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
529 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
530 [if test -e /etc/redhat-release; then
531 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
532 fi
533 if test -z "$ovs_cv_xsversion"; then
534 ovs_cv_xsversion=none
535 fi])
536 case $ovs_cv_xsversion in
537 none)
538 ;;
539
540 [[1-9]][[0-9]]* | dnl XenServer 10 or later
541 [[6-9]]* | dnl XenServer 6 or later
542 5.[[7-9]]* | dnl XenServer 5.7 or later
543 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
544 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
545 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
546 ;;
547
548 *)
549 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.)])
550 ;;
551 esac])
29d935d6
BP		 552
553dnl OVS_MAKE_HAS_IF([if-true], [if-false])
554dnl
555dnl Checks whether make has the GNU make $(if condition,then,else) extension.
556dnl Runs 'if-true' if so, 'if-false' otherwise.
372d58a4 557AC_DEFUN([OVS_CHECK_MAKE_IF],
29d935d6
BP		 558 [AC_CACHE_CHECK(
559 [whether ${MAKE-make} has GNU make \$(if) extension],
560 [ovs_cv_gnu_make_if],
561 [cat <<'EOF' > conftest.mk
562conftest.out:
380f86e4 563 echo $(if x,y,z) > conftest.out
29d935d6
BP		 564.PHONY: all
565EOF
566 rm -f conftest.out
567 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
568 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
569 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
570 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
571 result=`cat conftest.out`
572 rm -f conftest.mk conftest.out
573 if test "X$result" = "Xy"; then
574 ovs_cv_gnu_make_if=yes
575 else
576 ovs_cv_gnu_make_if=no
372d58a4 577 fi])])
29d935d6 578
b4e1bf8b
BP		 579dnl OVS_CHECK_GNU_MAKE
580dnl
581dnl Checks whether make is GNU make (because Linux kernel Makefiles
582dnl only work with GNU make).
583AC_DEFUN([OVS_CHECK_GNU_MAKE],
584 [AC_CACHE_CHECK(
585 [whether ${MAKE-make} is GNU make],
586 [ovs_cv_gnu_make],
587 [rm -f conftest.out
588 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
589 ${MAKE-make} --version >conftest.out 2>&1
590 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
591 result=`cat conftest.out`
592 rm -f conftest.mk conftest.out
593
594 case $result in # (
595 GNU*) ovs_cv_gnu_make=yes ;; # (
596 *) ovs_cv_gnu_make=no ;;
597 esac])
598 AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
599
643c0c34
BP		 600dnl OVS_CHECK_SPARSE_TARGET
601dnl
602dnl The "cgcc" script from "sparse" isn't very good at detecting the
603dnl target for which the code is being built. This helps it out.
604AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
605 [AC_CACHE_CHECK(
606 [target hint for cgcc],
607 [ac_cv_sparse_target],
608 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
609 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
610 [x86_64-*], [ac_cv_sparse_target=x86_64],
611 [ac_cv_sparse_target=other])])
612 AS_CASE([$ac_cv_sparse_target],
613 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
614 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
615 [SPARSEFLAGS= CGCCFLAGS=])
616 AC_SUBST([SPARSEFLAGS])
617 AC_SUBST([CGCCFLAGS])])
618
32e96ab7
AZ		 619dnl OVS_SPARSE_EXTRA_INCLUDES
620dnl
621dnl The cgcc script from "sparse" does not search gcc's default
622dnl search path. Get the default search path from GCC and pass
623dnl them to sparse.
624AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
625 AC_SUBST([SPARSE_EXTRA_INCLUDES],
626 [`$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 ' ' `] ))
627
29d935d6
BP		 628dnl OVS_ENABLE_SPARSE
629AC_DEFUN([OVS_ENABLE_SPARSE],
643c0c34 630 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
372d58a4 631 AC_REQUIRE([OVS_CHECK_MAKE_IF])
32e96ab7 632 AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
372d58a4
BP		 633 : ${SPARSE=sparse}
634 AC_SUBST([SPARSE])
635 AC_CONFIG_COMMANDS_PRE(
636 [if test $ovs_cv_gnu_make_if = yes; then
38b7a52b 637 CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
372d58a4 638 fi])])
8a8cd0ac
BP		 639
640dnl OVS_PTHREAD_SET_NAME
641dnl
642dnl This checks for three known variants of pthreads functions for setting
643dnl the name of the current thread:
644dnl
645dnl glibc: int pthread_setname_np(pthread_t, const char *name);
646dnl NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
647dnl FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
648dnl
649dnl For glibc and FreeBSD, the arguments are just a thread and its name. For
650dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
651dnl provide to it.
652dnl
653dnl This macro defines:
654dnl
655dnl glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
656dnl NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
657dnl FreeBSD: HAVE_PTHREAD_SET_NAME_NP
658AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
659 [AC_CHECK_FUNCS([pthread_set_name_np])
660 if test $ac_cv_func_pthread_set_name_np != yes; then
661 AC_CACHE_CHECK(
662 [for pthread_setname_np() variant],
663 [ovs_cv_pthread_setname_np],
664 [AC_LINK_IFELSE(
a0903134 665 [AC_LANG_PROGRAM([#include <pthread.h>
8a8cd0ac 666 ], [pthread_setname_np(pthread_self(), "name");])],
a0903134 667 [ovs_cv_pthread_setname_np=glibc],
8a8cd0ac 668 [AC_LINK_IFELSE(
a0903134 669 [AC_LANG_PROGRAM([#include <pthread.h>
8a8cd0ac
BP		 670], [pthread_setname_np(pthread_self(), "%s", "name");])],
671 [ovs_cv_pthread_setname_np=netbsd],
a0903134 672 [ovs_cv_pthread_setname_np=none])])])
8a8cd0ac
BP		 673 case $ovs_cv_pthread_setname_np in # (
674 glibc)
a0903134
YT		 675 AC_DEFINE(
676 [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
677 [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
678 ;; # (
8a8cd0ac 679 netbsd)
a0903134
YT		 680 AC_DEFINE(
681 [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
682 [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
683 ;;
8a8cd0ac
BP		 684 esac
685 fi])
5020f5f0
BP		 686
687dnl OVS_CHECK_LINUX_HOST.
688dnl
689dnl Checks whether we're building for a Linux host, based on the presence of
690dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
691dnl LINUX based on the result.
692AC_DEFUN([OVS_CHECK_LINUX_HOST],
693 [AC_CACHE_CHECK(
694 [whether __linux__ is defined],
695 [ovs_cv_linux],
696 [AC_COMPILE_IFELSE(
697 [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
698 [ovs_cv_linux=true],
699 [ovs_cv_linux=false])])
700 AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])
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