Fixed the case where a device does not support inline data. Redefined the interpretation of max_inline_data MCA parameter.

* If max_inline_data == -1 perform runtime detection 
* If max_inline_data >=0 use the value provided 
* If the user does not explicitly set this via command line, use the value from INI file

This commit fixes trac:1662

This commit was SVN r19995.

The following Trac tickets were found above:
  Ticket 1662 --> https://svn.open-mpi.org/trac/ompi/ticket/1662

ompi/mca/btl/openib/btl_openib_component.c

@@ -1542,15 +1542,36 @@ static int init_one_device(opal_list_t *btl_list, struct ibv_device* ib_dev)
     /* Figure out what the max_inline_data value should be for all
        ports and QPs on this device */
     need_search = false;
-    if (0 == mca_btl_openib_component.ib_max_inline_data) {
+    if(-2 != mca_btl_openib_component.ib_max_inline_data) {
+        /* User has explicitly set btl_openib_max_inline_data MCA parameter 
+           Per setup in _mca.c, we know that the MCA param value is guaranteed
+           to be >= -1 */
+        if (-1 == mca_btl_openib_component.ib_max_inline_data) {
             need_search = true;
-    } else if (mca_btl_openib_component.ib_max_inline_data > 0) {
-        device->max_inline_data = mca_btl_openib_component.ib_max_inline_data;
+        } else {
+            device->max_inline_data = (uint32_t) 
+                mca_btl_openib_component.ib_max_inline_data;
+        }
     } else if (values.max_inline_data_set) {
-        if (0 == values.max_inline_data) {
+        if (-1 == values.max_inline_data) {
             need_search = true;
-        } else if (values.max_inline_data > 0) {
-            device->max_inline_data = values.max_inline_data;
+        } else if (values.max_inline_data >= 0) {
+            device->max_inline_data = (uint32_t) values.max_inline_data;
+        } else {
+            if(default_values.max_inline_data_set && 
+               default_values.max_inline_data >= -1) {
+                BTL_ERROR(("Invalid max_inline_data value specified "
+                           "in INI file (%d); using default value (%d)", 
+                            values.max_inline_data, 
+                            default_values.max_inline_data));
+                device->max_inline_data = (uint32_t) 
+                    default_values.max_inline_data;
+            } else {
+                BTL_ERROR(("Invalid max_inline_data value specified "
+                           "in INI file (%d)", values.max_inline_data));
+                ret = OMPI_ERR_BAD_PARAM;
+                goto error;
+            } 
         }
     }
     /* Horrible.  :-( Per the thread starting here:
@@ -2098,6 +2119,19 @@ btl_openib_component_init(int *num_btl_modules,
             ompi_mpi_leave_pinned_pipeline = 0;
         }
     }
+    index = mca_base_param_find("btl", "openib", "max_inline_data");
+    if (index >= 0) {
+        if (OPAL_SUCCESS == mca_base_param_lookup_source(index, &source,
+                                                         NULL)) {
+            if (-1 == mca_btl_openib_component.ib_max_inline_data  && 
+                MCA_BASE_PARAM_SOURCE_DEFAULT == source) {
+                /* If the user has not explicitly set this MCA parameter
+                   use max_inline_data value specified in the 
+                   device-specific parameters INI file */
+                mca_btl_openib_component.ib_max_inline_data = -2;
+            }
+        }
+    }
 
     OBJ_CONSTRUCT(&mca_btl_openib_component.send_free_coalesced, ompi_free_list_t);
     OBJ_CONSTRUCT(&mca_btl_openib_component.send_user_free, ompi_free_list_t);

ompi/mca/btl/openib/btl_openib_ini.c

@@ -397,7 +397,7 @@ static int parse_line(parsed_section_values_t *sv)
 
     else if (0 == strcasecmp(key_buffer, "max_inline_data")) {
         /* Single value */
-        sv->values.max_inline_data = (uint32_t) ompi_btl_openib_ini_intify(value);
+        sv->values.max_inline_data = (int32_t) ompi_btl_openib_ini_intify(value);
         sv->values.max_inline_data_set = true;
     }
 

ompi/mca/btl/openib/btl_openib_ini.h

@@ -29,7 +29,7 @@ typedef struct ompi_btl_openib_ini_values_t {
 
     char *receive_queues;
 
-    uint32_t max_inline_data;
+    int32_t max_inline_data;
     bool max_inline_data_set;
 } ompi_btl_openib_ini_values_t;
 

ompi/mca/btl/openib/btl_openib_mca.c

@@ -270,9 +270,10 @@ int btl_openib_register_mca_params(void)
 
     CHECK(reg_int("max_inline_data", "ib_max_inline_data",
                   "Maximum size of inline data segment "
-                  "(-1 = use device default, "
-                  "0 = run-time probe to discover max value, "
-                  "otherwise must be >= 1)",
+                  "(-1 = run-time probe to discover max value, "
+                  "otherwise must be >= 0). "
+                  "If not explicitly set, use max_inline_data from "
+                  "the INI file containing device-specific parameters",
                   -1, &ival, REGINT_NEG_ONE_OK | REGINT_GE_ZERO));
     mca_btl_openib_component.ib_max_inline_data = (int32_t) ival;
 

ompi/mca/btl/openib/mca-btl-openib-device-params.ini

@@ -87,7 +87,7 @@
 #    receive_queues = P,128,256,192,128:S,65536,256,192,128
 
 # max_inline_data: an integer specifying the maximum inline data (in
-# bytes) supported by the device.  0 means to use a run-time probe to
+# bytes) supported by the device.  -1 means to use a run-time probe to
 # figure out the maximum value supported by the device.
 
 #    max_inline_data = 1024
@@ -151,6 +151,7 @@ vendor_part_id = 0
 use_eager_rdma = 1
 mtu = 2048
 receive_queues = P,128,256,192,128:P,65536,256,192,128
+max_inline_data = 0
 
 ############################################################################