fix(ascend): inject the driver tree whole, for the tool that answers device addresses

gpustack_runtime/deployer/cdi/ascend.py

@@ -43,14 +43,22 @@
 https://gitcode.com/Ascend/mind-cluster/blob/master/docs/en/scheduling/references/appendix.md.
 """
 
-_HCCN_CONF_PATH = "/etc/hccn.conf"
+_ASCEND_DRIVER_PATH = "/usr/local/Ascend/driver"
 """
-The device NIC addresses, as configured on the host. A transport that builds
-RoCE endpoints reads them from this file or from hccn_tool, which lives in a
-driver directory none of the mounts below covers; without either, the engine
-fails to initialize with "Failed to get device ip from hccn.conf and
-hccn_tool". A container that talks to another node over Device RoCE therefore
-needs this file, and one that does not is unaffected by its presence.
+The host driver tree, injected whole rather than as the three subdirectories
+the libraries and the topology file sit in.
+
+What the wider mount adds is hccn_tool: a transport that builds Device RoCE
+endpoints reads each NPU's NIC address through it, and a container holding the
+driver libraries but not the tool cannot open that transport at all -- it
+fails with "Failed to get device ip from hccn.conf and hccn_tool" and every
+process that opens it dies at startup. Reading the addresses out of
+/etc/hccn.conf instead works too, but only on a host that keeps them there,
+while the tool answers from the driver on every host that has one.
+
+The driver belongs to the host on every Ascend containerization path -- the
+image supplies the toolkit -- so injecting more of it shadows nothing a
+container ships with its own image.
 """
 
 _A5_RANKTABLE_VERSION = "2.0"
@@ -170,10 +178,7 @@ def generate(
 
         mount_paths = [
             _HCCL_RANKTABLE_PATH,
-            _HCCN_CONF_PATH,
-            "/usr/local/Ascend/driver/topo",
-            "/usr/local/Ascend/driver/lib64",
-            "/usr/local/Ascend/driver/include",
+            _ASCEND_DRIVER_PATH,
             "/usr/local/dcmi",
             "/usr/local/bin/npu-smi",
             "/var/queue_schedule",

tests/gpustack_runtime/deployer/test_ascend_ranktable.py

@@ -79,9 +79,7 @@ def test_a5_omits_the_host_ranktable():
     targets = _mount_targets(cfg)
     assert cdi_ascend._HCCL_RANKTABLE_PATH not in targets
     # The rest of the vendor's named list is untouched.
-    assert "/usr/local/Ascend/driver/topo" in targets
-    assert "/usr/local/Ascend/driver/lib64" in targets
-    assert "/usr/local/Ascend/driver/include" in targets
+    assert cdi_ascend._ASCEND_DRIVER_PATH in targets
     assert "/usr/local/dcmi" in targets
     assert "/usr/local/bin/npu-smi" in targets