hmem/cuda: avoid stub loading at runtime

When the CUDA toolkit is installed, a set of "stub" libraries are
installed under /usr/local/cuda*/lib64/stubs/. These libraries include a
SONAME field with a `.1' suffix, but the filenames of these stubs are
bare. eg:

 > $ readelf -d /usr/local/cuda-12.5/lib64/stubs/libnvidia-ml.so | grep soname
 > 0x000000000000000e (SONAME)  Library soname: [libnvidia-ml.so.1]

The CUDA toolkit does not include any library file with the name
`libnvidia-ml.so.1` (or `libcuda.so.1`, etc.), as these are provided by
the driver package. This disconnect between the stub filename in the
toolkit and the SONAME within it is done intentionally to allow linking
with the stub at build time, while ensuring it's never loaded at
runtime.

In normal dynamic linking cases (ie: without dlopen), the SONAME field
of `libnvidia-ml.so.1` is used in the DT_NEEDED tag, where that filename
can only come from a driver package and this ensures that the stub
library will never match.

Match the same behavior and provide `.1` suffixes to dlopen where
appropriate for NVIDIA libraries.

Signed-off-by: Nicholas Sielicki <[email protected]>

fabtests/common/hmem_cuda.c

@@ -157,9 +157,9 @@ int ft_cuda_init(void)
 		goto err;
 	}
 
-	cuda_handle = dlopen("libcuda.so", RTLD_NOW);
+	cuda_handle = dlopen("libcuda.so.1", RTLD_NOW);
 	if (!cuda_handle) {
-		FT_ERR("Failed to dlopen libcuda.so\n");
+		FT_ERR("Failed to dlopen libcuda.so.1\n");
 		goto err_dlclose_cudart;
 	}
 

src/hmem_cuda.c

@@ -487,22 +487,17 @@ static int cuda_hmem_dl_init(void)
 		return -FI_ENOSYS;
 	}
 
-	cuda_attr.driver_handle = dlopen("libcuda.so", RTLD_NOW);
+	cuda_attr.driver_handle = dlopen("libcuda.so.1", RTLD_NOW);
 	if (!cuda_attr.driver_handle) {
 		FI_WARN(&core_prov, FI_LOG_CORE,
-			"Failed to dlopen libcuda.so\n");
+			"Failed to dlopen libcuda.so.1\n");
 		goto err_dlclose_cuda_runtime;
 	}
 
-	cuda_attr.nvml_handle = dlopen("libnvidia-ml.so", RTLD_NOW);
+	cuda_attr.nvml_handle = dlopen("libnvidia-ml.so.1", RTLD_NOW);
 	if (!cuda_attr.nvml_handle) {
-		FI_INFO(&core_prov, FI_LOG_CORE,
-			"Failed to dlopen libnvidia-ml.so.  Trying libnvidia-ml.so.1\n");
-		cuda_attr.nvml_handle = dlopen("libnvidia-ml.so.1", RTLD_NOW);
-		if (!cuda_attr.nvml_handle) {
-			FI_WARN(&core_prov, FI_LOG_CORE,
-			"Failed to dlopen libnvidia-ml.so or libnvidia-ml.so.1, bypassing nvml calls\n");
-		}
+		FI_WARN(&core_prov, FI_LOG_CORE,
+			"Failed to dlopen libnvidia-ml.so.1, bypassing nvml calls\n");
 	}
 
 	CUDA_DRIVER_FUNCS_DEF(CUDA_DRIVER_FUNCS_DLOPEN)