ofi/btl: CHange default support to 1 & 2 sided ops

bwbarrett · bwbarrett · commit fd95d787cc39 · 2025-07-14T14:46:30.000Z
Historically, the OFI BTL has defaulted to only supporting one-sided
operations (ie, the RDMA OSC component).  Howard and I can't think of
a current Libfabric provider that has a performance difference when
in one-sided vs. both one and two-sided mode, so change the default
to support both.  This allows users who want to use the OB1 PML to
specify `-mca pml ob1` without also having to change the default
mode in the BTL.

Signed-off-by: Brian Barrett &lt;bbarrett@amazon.com&gt;
diff --git a/opal/mca/btl/ofi/btl_ofi_component.c b/opal/mca/btl/ofi/btl_ofi_component.c
@@ -150,7 +150,7 @@ static int mca_btl_ofi_component_register(void)
         return OPAL_ERR_OUT_OF_RESOURCE;
     }
 
-    mca_btl_ofi_component.mode = MCA_BTL_OFI_MODE_ONE_SIDED;
+    mca_btl_ofi_component.mode = MCA_BTL_OFI_MODE_FULL_SUPPORT;
     (void) mca_base_component_var_register(&mca_btl_ofi_component.super.btl_version, "mode", msg,
                                            MCA_BASE_VAR_TYPE_INT, NULL, 0, 0, OPAL_INFO_LVL_5,
                                            MCA_BASE_VAR_SCOPE_READONLY,

Original file line number	Diff line number	Diff line change
`@@ -150,7 +150,7 @@ static int mca_btl_ofi_component_register(void)`
`150`	`150`	`return OPAL_ERR_OUT_OF_RESOURCE;`
`151`	`151`	`}`
`152`	`152`
`153`		`- mca_btl_ofi_component.mode = MCA_BTL_OFI_MODE_ONE_SIDED;`
	`153`	`+ mca_btl_ofi_component.mode = MCA_BTL_OFI_MODE_FULL_SUPPORT;`
`154`	`154`	`(void) mca_base_component_var_register(&mca_btl_ofi_component.super.btl_version, "mode", msg,`
`155`	`155`	`MCA_BASE_VAR_TYPE_INT, NULL, 0, 0, OPAL_INFO_LVL_5,`
`156`	`156`	`MCA_BASE_VAR_SCOPE_READONLY,`