dnl Configury specific to the libfabric verbs provider

dnl Called to configure this provider
dnl
dnl Arguments:
dnl
dnl $1: action if configured successfully
dnl $2: action if not configured successfully
dnl
AC_DEFUN([FI_VERBS_CONFIGURE],[
	# Determine if we can support the verbs provider
	verbs_ibverbs_happy=0
	verbs_rdmacm_happy=0
	AS_IF([test x"$enable_verbs" != x"no"],
	      [FI_CHECK_PACKAGE([verbs_ibverbs],
				[infiniband/verbs.h],
				[ibverbs],
				[ibv_open_device],
				[],
				[$verbs_PREFIX],
				[$verbs_LIBDIR],
				[FI_VERBS_DOUBLE_CHECK_LIBIBVERBS],
				[verbs_ibverbs_happy=0])

	       FI_CHECK_PACKAGE([verbs_rdmacm],
				[rdma/rdma_cma.h],
				[rdmacm],
				[rdma_create_qp],
				[],
				[$verbs_PREFIX],
				[$verbs_LIBDIR],
				[verbs_rdmacm_happy=1],
				[verbs_rdmacm_happy=0])

	       FI_CHECK_PACKAGE([verbs_rdmacm_ex],
				[rdma/rdma_cma.h],
				[rdmacm],
				[rdma_create_qp_ex],
				[],
				[$verbs_PREFIX],
				[$verbs_LIBDIR],
				[verbs_rdmacm_ex_happy=1],
				[verbs_rdmacm_ex_happy=0])

	      ])

	AS_IF([test $verbs_ibverbs_happy -eq 1 && \
	       test $verbs_rdmacm_happy -eq 1], [$1], [$2])

	#Set CPPFLAGS to allow correct include path to be used by AC_CHECK_DECL()
	fi_verbs_configure_save_CPPFLAGS=$CPPFLAGS
	CPPFLAGS=$verbs_ibverbs_CPPFLAGS

	#See if we have extended verbs calls
	VERBS_HAVE_QUERY_EX=0
	AS_IF([test $verbs_ibverbs_happy -eq 1],[
		AC_CHECK_DECL([ibv_query_device_ex],
			[VERBS_HAVE_QUERY_EX=1],[],
			[#include <infiniband/verbs.h>])
		])
	AC_DEFINE_UNQUOTED([VERBS_HAVE_QUERY_EX],[$VERBS_HAVE_QUERY_EX],
		[Whether infiniband/verbs.h has ibv_query_device_ex() support or not])

	#See if we have XRC support
	VERBS_HAVE_XRC=0
	AS_IF([test $verbs_ibverbs_happy -eq 1 && \
	       test $verbs_rdmacm_ex_happy -eq 1],[
		AC_CHECK_DECL([IBV_QPT_XRC_SEND],
			[VERBS_HAVE_XRC=1],[],
			[#include <infiniband/verbs.h>])
		])
	AC_DEFINE_UNQUOTED([VERBS_HAVE_XRC],[$VERBS_HAVE_XRC],
		[Whether infiniband/verbs.h has XRC support or not])

	#See if we have rdma-core rdma_establish support
	VERBS_HAVE_RDMA_ESTABLISH=0
	AS_IF([test $verbs_ibverbs_happy -eq 1 && \
	       test $verbs_rdmacm_ex_happy -eq 1],[
		AC_CHECK_DECL([rdma_establish],
			[VERBS_HAVE_RDMA_ESTABLISH=1],[],
			[#include <rdma/rdma_cma.h>])
		])
	AC_DEFINE_UNQUOTED([VERBS_HAVE_RDMA_ESTABLISH],[$VERBS_HAVE_RDMA_ESTABLISH],
		[Whether rdma/rdma_cma.h has rdma_establish() support or not])

	#See if we have rdma-core dmabuf mr support
	VERBS_HAVE_DMABUF_MR=0
	AS_IF([test $verbs_ibverbs_happy -eq 1],[
		AC_CHECK_DECL([ibv_reg_dmabuf_mr],
			[VERBS_HAVE_DMABUF_MR=1],[],
			[#include <infiniband/verbs.h>])
		])
	AC_DEFINE_UNQUOTED([VERBS_HAVE_DMABUF_MR],[$VERBS_HAVE_DMABUF_MR],
		[Whether infiniband/verbs.h has ibv_reg_dmabuf_mr() support or not])

	CPPFLAGS=$fi_verbs_configure_save_CPPFLAGS

	# Technically, verbs_ibverbs_CPPFLAGS and
	# verbs_rdmacm_CPPFLAGS could be different, but it is highly
	# unlikely that they ever will be.  So only list
	# verbs_ibverbs_CPPFLAGS here.  Same with verbs_*_LDFLAGS,
	# below.
	verbs_CPPFLAGS=$verbs_ibverbs_CPPFLAGS
	verbs_LDFLAGS=$verbs_ibverbs_LDFLAGS
	verbs_LIBS="$verbs_rdmacm_LIBS $verbs_ibverbs_LIBS"
	AC_SUBST(verbs_CPPFLAGS)
	AC_SUBST(verbs_LDFLAGS)
	AC_SUBST(verbs_LIBS)
])

dnl
dnl Per https://github.com/ofiwg/libfabric/issues/2070, it is possible
dnl that the AC_CHECK_LIB test for libibverbs is not sufficient --
dnl i.e., AC_CHECK_LIB may succeed, but then linking with libtool may
dnl fail.  This test therefore double checks that we can successfully
dnl use libtool to link against libibverbs.  NOTE: this test is
dnl contingent upon LT_OUTPUT having already been invoked (i.e., so that
dnl the libtool script exists).
dnl
AC_DEFUN([FI_VERBS_DOUBLE_CHECK_LIBIBVERBS],[
	AC_MSG_CHECKING(if libibverbs is linkable by libtool)
	file=conftemp.$$.c
	rm -f $file conftemp
	cat > $file <<-EOF
char ibv_open_device ();
int main ()
{ return ibv_open_device (); }
EOF

	cmd="./libtool --mode=link --tag=CC $CC $CPPFLAGS $CFLAGS $file -o conftemp $LDFLAGS -libverbs"
	echo "configure:$LINENO: $cmd" >> config.log 2>&1
	eval $cmd >> config.log 2>&1
	status=$?
	AS_IF([test $status -eq 0 && test -x conftemp],
		[AC_MSG_RESULT(yes)
		verbs_ibverbs_happy=1],
		[AC_MSG_RESULT(no)
		echo "configure: failed program was" >> config.log
		cat $file >> config.log
		verbs_ibverbs_happy=0])

	rm -f $file conftemp
])