btl/openib: fix check for exp verbs struct members

This commit fixes a compilation issue with some versions of exp
verbs. In some cases struct ibv_exp_device_attr does not have either
the exp_atom or exp_atomic_cap fields. It is fine to drop one check
and fall back to the non-exp attribute check on the other.

Signed-off-by: Nathan Hjelm <[email protected]>

(cherry picked from open-mpi/ompi@a65af6d)

Signed-off-by: Nathan Hjelm <[email protected]>

Author: hjelmn

config/opal_check_openfabrics.m4

@@ -400,6 +400,8 @@ AC_DEFUN([OPAL_CHECK_EXP_VERBS],[
     AC_DEFINE_UNQUOTED([HAVE_EXP_VERBS], [$have_struct_ibv_exp_send_wr], [Experimental verbs])
     AC_CHECK_DECLS([IBV_EXP_ATOMIC_HCA_REPLY_BE, IBV_EXP_QP_CREATE_ATOMIC_BE_REPLY, ibv_exp_create_qp, ibv_exp_query_device],
                    [], [], [#include <infiniband/verbs_exp.h>])
+    AC_CHECK_MEMBERS([struct ibv_exp_device_attr.ext_atom, struct ibv_exp_device_attr.ext_atomic_cap], [], [],
+                     [[#include <infiniband/verbs_exp.h>]])
     AS_IF([test '$have_struct_ibv_exp_send_wr' = 1], [$1], [$2])
     OPAL_VAR_SCOPE_POP
 ])dnl

opal/mca/btl/openib/btl_openib_component.c

@@ -780,7 +780,7 @@ static int init_one_port(opal_list_t *btl_list, mca_btl_openib_device_t *device,
 #if HAVE_DECL_IBV_ATOMIC_HCA
             openib_btl->atomic_ops_be = false;
 
-#if HAVE_DECL_IBV_EXP_QUERY_DEVICE
+#if HAVE_STRUCT_IBV_EXP_DEVICE_ATTR_EXT_ATOM
             /* check that 8-byte atomics are supported */
             if (!(device->ib_exp_dev_attr.ext_atom.log_atomic_arg_sizes & (1<<3ull))) {
                 openib_btl->super.btl_flags &= ~MCA_BTL_FLAGS_ATOMIC_FOPS;
@@ -790,7 +790,7 @@ static int init_one_port(opal_list_t *btl_list, mca_btl_openib_device_t *device,
             }
 #endif
 
-#if HAVE_DECL_IBV_EXP_QUERY_DEVICE
+#if HAVE_STRUCT_IBV_EXP_DEVICE_ATTR_EXT_ATOMIC_CAP
             switch (openib_btl->device->ib_exp_dev_attr.exp_atomic_cap)
 #else
             switch (openib_btl->device->ib_dev_attr.atomic_cap)