datapath: Add IPv6 to list of parsed EtherTypes.
[sliver-openvswitch.git] / acinclude.m4
1 # -*- autoconf -*-
2
3 # Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
4 #
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at:
8 #
9 #     http://www.apache.org/licenses/LICENSE-2.0
10 #
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
16
17 dnl OVS_ENABLE_WERROR
18 AC_DEFUN([OVS_ENABLE_WERROR],
19   [AC_ARG_ENABLE(
20      [Werror],
21      [AC_HELP_STRING([--enable-Werror], [Add -Werror to CFLAGS])],
22      [], [enable_Werror=no])
23    AC_CONFIG_COMMANDS_PRE(
24      [if test "X$enable_Werror" = Xyes; then
25         CFLAGS="$CFLAGS -Werror"
26       fi])])
27
28 dnl OVS_CHECK_LINUX
29 dnl
30 dnl Configure linux kernel source tree 
31 AC_DEFUN([OVS_CHECK_LINUX], [
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
38                                (usually figured out automatically from build
39                                directory)])])
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=$with_l26_source
59       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
60     else
61       KSRC=
62     fi
63   elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
64     AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
65   fi
66
67   if test -n "$KBUILD"; then
68     KBUILD=`eval echo "$KBUILD"`
69     case $KBUILD in
70         /*) ;;
71         *) KBUILD=`pwd`/$KBUILD ;;
72     esac
73
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])
79         AC_SUBST(KBUILD)
80     else
81         AC_MSG_RESULT([no])
82         AC_ERROR([source dir $KBUILD doesn't exist])
83     fi
84
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"`
91       case $KSRC in
92           /*) ;;
93           *) KSRC=`pwd`/$KSRC ;;
94       esac
95       if test ! -e $KSRC/include/linux/kernel.h; then
96         AC_MSG_ERROR([$KSRC is not a kernel source directory])
97       fi
98     else
99       KSRC=$KBUILD
100       if test ! -e $KSRC/include/linux/kernel.h; then
101         case `echo "$KBUILD" | sed 's,/*$,,'` in # (
102           */build)
103             KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
104             ;; # (
105           *)
106             KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
107             ;;
108         esac
109       fi
110       if test ! -e $KSRC/include/linux/kernel.h; then
111         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
112       fi
113     fi
114     AC_MSG_RESULT([$KSRC])
115
116     AC_MSG_CHECKING([for kernel version])
117     version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
118     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
119     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
120     if test X"$version" = X || test X"$patchlevel" = X; then
121        AC_ERROR([cannot determine kernel version])
122     elif test X"$sublevel" = X; then
123        kversion=$version.$patchlevel
124     else
125        kversion=$version.$patchlevel.$sublevel
126     fi
127     AC_MSG_RESULT([$kversion])
128
129     if test "$version" -ge 3; then
130        : # Linux 3.x
131     elif test "$version" = 2 && test "$patchlevel" -ge 6; then
132        : # Linux 2.6.x
133     else
134        if test "$KBUILD" = "$KSRC"; then
135          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6 or later is required])
136        else
137          AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is version $kversion, but version 2.6 or later is required])
138        fi
139     fi
140     if test ! -e "$KBUILD"/include/linux/version.h || \
141        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
142         test ! -e "$KBUILD"/include/generated/autoconf.h); then
143         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
144     fi
145     OVS_CHECK_LINUX_COMPAT
146   fi
147   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
148 ])
149
150 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
151 dnl
152 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
153 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
154 dnl <REGEX> translated to uppercase.
155 AC_DEFUN([OVS_GREP_IFELSE], [
156   AC_MSG_CHECKING([whether $2 matches in $1])
157   if test -f $1; then
158     grep '$2' $1 >/dev/null 2>&1
159     status=$?
160     case $status in
161       0) 
162         AC_MSG_RESULT([yes])
163         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
164         ;;
165       1) 
166         AC_MSG_RESULT([no])
167         $4
168         ;;
169       *) 
170         AC_MSG_ERROR([grep exited with status $status])
171         ;;
172     esac
173   else
174     AC_MSG_RESULT([file not found])
175     $4
176   fi
177 ])
178
179 dnl OVS_DEFINE(NAME)
180 dnl
181 dnl Defines NAME to 1 in kcompat.h.
182 AC_DEFUN([OVS_DEFINE], [
183   echo '#define $1 1' >> datapath/linux/kcompat.h.new
184 ])
185
186 AC_DEFUN([OVS_CHECK_LOG2_H], [
187   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
188   if test -e $KSRC/include/linux/log2.h; then
189     AC_MSG_RESULT([yes])
190     OVS_DEFINE([HAVE_LOG2_H])
191   else
192     AC_MSG_RESULT([no])
193   fi
194 ])
195
196 dnl OVS_CHECK_LINUX_COMPAT
197 dnl
198 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
199 dnl the directory in $KBUILD.
200 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
201   rm -f datapath/linux/kcompat.h.new
202   mkdir -p datapath/linux
203   : > datapath/linux/kcompat.h.new
204
205   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
206                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
207
208   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
209
210   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
211
212   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
213   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
214   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
215
216   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
217                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
218                                    [rcu_read_lock_held])])
219   
220   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
221   # is necessary because some versions of this header remove the
222   # member but retain the kerneldoc comment that describes it (which
223   # starts with @).  The brackets must be doubled because of m4
224   # quoting rules.
225   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
226                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
227   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
228                   [OVS_DEFINE([HAVE_MAC_RAW])])
229   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
230                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
231   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], 
232                   [skb_copy_from_linear_data_offset])
233   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
234   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
235                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
236   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
237                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
238   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
239                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
240   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
241
242   OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
243                   [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
244
245   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
246                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
247   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
248                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
249
250   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
251   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
252
253   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
254   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
255   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
256
257   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
258                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
259
260   OVS_CHECK_LOG2_H
261
262   if cmp -s datapath/linux/kcompat.h.new \
263             datapath/linux/kcompat.h >/dev/null 2>&1; then
264     rm datapath/linux/kcompat.h.new
265   else
266     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
267   fi
268 ])
269
270 dnl Checks for net/if_packet.h.
271 AC_DEFUN([OVS_CHECK_IF_PACKET],
272   [AC_CHECK_HEADER([net/if_packet.h],
273                    [HAVE_IF_PACKET=yes],
274                    [HAVE_IF_PACKET=no])
275    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
276    if test "$HAVE_IF_PACKET" = yes; then
277       AC_DEFINE([HAVE_IF_PACKET], [1],
278                 [Define to 1 if net/if_packet.h is available.])
279    fi])
280
281 dnl Checks for buggy strtok_r.
282 dnl
283 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
284 dnl with optimization that can cause segfaults:
285 dnl
286 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
287 AC_DEFUN([OVS_CHECK_STRTOK_R],
288   [AC_CACHE_CHECK(
289      [whether strtok_r macro segfaults on some inputs],
290      [ovs_cv_strtok_r_bug],
291      [AC_RUN_IFELSE(
292         [AC_LANG_PROGRAM([#include <stdio.h>
293                           #include <string.h>
294                          ],
295                          [[char string[] = ":::";
296                            char *save_ptr = (char *) 0xc0ffee;
297                            char *token1, *token2;
298                            token1 = strtok_r(string, ":", &save_ptr);
299                            token2 = strtok_r(NULL, ":", &save_ptr);
300                            freopen ("/dev/null", "w", stdout);
301                            printf ("%s %s\n", token1, token2);
302                            return 0;
303                           ]])],
304         [ovs_cv_strtok_r_bug=no],
305         [ovs_cv_strtok_r_bug=yes],
306         [ovs_cv_strtok_r_bug=yes])])
307    if test $ovs_cv_strtok_r_bug = yes; then
308      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
309                [Define if strtok_r macro segfaults on some inputs])
310    fi
311 ])
312
313 dnl ----------------------------------------------------------------------
314 dnl These macros are from GNU PSPP, with the following original license:
315 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
316 dnl This file is free software; the Free Software Foundation
317 dnl gives unlimited permission to copy and/or distribute it,
318 dnl with or without modifications, as long as this notice is preserved.
319
320 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
321 dnl Check whether the given C compiler OPTION is accepted.
322 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
323 AC_DEFUN([OVS_CHECK_CC_OPTION],
324 [
325   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
326   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name], 
327     [ovs_save_CFLAGS="$CFLAGS"
328      CFLAGS="$CFLAGS $1"
329      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
330      CFLAGS="$ovs_save_CFLAGS"])
331   if test $ovs_cv_name = yes; then
332     m4_if([$2], [], [:], [$2])
333   else
334     m4_if([$3], [], [:], [$3])
335   fi
336 ])
337
338 dnl OVS_ENABLE_OPTION([OPTION])
339 dnl Check whether the given C compiler OPTION is accepted.
340 dnl If so, add it to WARNING_FLAGS.
341 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
342 AC_DEFUN([OVS_ENABLE_OPTION], 
343   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
344    AC_SUBST([WARNING_FLAGS])])
345
346 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
347 dnl Check whether the given C compiler OPTION is accepted.
348 dnl If so, enable the given Automake CONDITIONAL.
349
350 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
351 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
352   [OVS_CHECK_CC_OPTION(
353     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
354    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
355 dnl ----------------------------------------------------------------------
356
357 dnl Check for too-old XenServer.
358 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
359   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
360     [if test -e /etc/redhat-release; then
361        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
362      fi
363      if test -z "$ovs_cv_xsversion"; then
364        ovs_cv_xsversion=none
365      fi])
366   case $ovs_cv_xsversion in
367     none)
368       ;;
369
370     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
371     [[6-9]]* |                           dnl XenServer 6 or later
372     5.[[7-9]]* |                         dnl XenServer 5.7 or later
373     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
374     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
375     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
376       ;;
377
378     *)
379       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.)])
380       ;;
381   esac])
382
383 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
384 dnl
385 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
386 dnl Runs 'if-true' if so, 'if-false' otherwise.
387 AC_DEFUN([OVS_MAKE_HAS_IF],
388   [AC_CACHE_CHECK(
389      [whether ${MAKE-make} has GNU make \$(if) extension],
390      [ovs_cv_gnu_make_if],
391      [cat <<'EOF' > conftest.mk
392 conftest.out:
393         echo $(if x,y,z) > conftest.out
394 .PHONY: all
395 EOF
396       rm -f conftest.out
397       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
398       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
399       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
400       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
401       result=`cat conftest.out`
402       rm -f conftest.mk conftest.out
403       if test "X$result" = "Xy"; then
404         ovs_cv_gnu_make_if=yes
405       else
406         ovs_cv_gnu_make_if=no
407       fi])
408    AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
409
410 dnl OVS_CHECK_SPARSE_TARGET
411 dnl
412 dnl The "cgcc" script from "sparse" isn't very good at detecting the
413 dnl target for which the code is being built.  This helps it out.
414 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
415   [AC_CACHE_CHECK(
416     [target hint for cgcc],
417     [ac_cv_sparse_target],
418     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
419        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
420        [x86_64-*], [ac_cv_sparse_target=x86_64],
421        [ac_cv_sparse_target=other])])
422    AS_CASE([$ac_cv_sparse_target],
423      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
424      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
425      [SPARSEFLAGS= CGCCFLAGS=])
426    AC_SUBST([SPARSEFLAGS])
427    AC_SUBST([CGCCFLAGS])])
428
429 dnl OVS_ENABLE_SPARSE
430 AC_DEFUN([OVS_ENABLE_SPARSE],
431   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
432    OVS_MAKE_HAS_IF(
433      [AC_CONFIG_COMMANDS_PRE(
434         [: ${SPARSE=sparse}
435          AC_SUBST([SPARSE])
436          CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS)" cgcc $(CGCCFLAGS),'"$CC"')'])])])