nvme: improve probe error handling in MP even further

In cases we probe without a specific trid, the underlying
rte_bus_probe() in spdk_pci_enumerate() might fail to
initialize some devices, but still return with code 0,
That's technically correct, as we asked just to probe
devices on the bus and that's what it did. Some devices might
have been initialized, others not. In secondary process we
blindly assumed all devices were probed successfully, which
might have eventually led to assert failures, as current
process was not on the ctrlr->active_procs list.

To fix it, just add an additional check before attaching
the controller in secondary process.

Change-Id: If015b1e562052a9189ed1a48091b209bd2dd5f2a
Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/431727
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

lib/nvme/nvme.c

@@ -536,6 +536,11 @@ spdk_nvme_probe_internal(const struct spdk_nvme_transport_id *trid, void *cb_ctx
 				continue;
 			}
 
+			/* Do not attach if we failed to initialize it in this process */
+			if (spdk_nvme_ctrlr_get_current_process(ctrlr) == NULL) {
+				continue;
+			}
+
 			nvme_ctrlr_proc_get_ref(ctrlr);
 
 			/*

test/unit/lib/nvme/nvme.c/nvme_ut.c

@@ -59,6 +59,10 @@ DEFINE_STUB(spdk_pci_device_get_id, struct spdk_pci_id,
 DEFINE_STUB(spdk_nvme_transport_available, bool,
 	    (enum spdk_nvme_transport_type trtype), true)
 
+/* return anything non-NULL, this won't be deferenced anywhere in this test */
+DEFINE_STUB(spdk_nvme_ctrlr_get_current_process, struct spdk_nvme_ctrlr_process *,
+	    (struct spdk_nvme_ctrlr *ctrlr), (struct spdk_nvme_ctrlr_process *)(uintptr_t)0x1)
+
 DEFINE_STUB(nvme_ctrlr_add_process, int,
 	    (struct spdk_nvme_ctrlr *ctrlr, void *devhandle), 0)
 

test/unit/lib/nvme/nvme_ns_cmd.c/nvme_ns_cmd_ut.c

@@ -91,6 +91,9 @@ nvme_ctrlr_destruct(struct spdk_nvme_ctrlr *ctrlr)
 {
 }
 
+DEFINE_STUB(spdk_nvme_ctrlr_get_current_process, struct spdk_nvme_ctrlr_process *,
+	    (struct spdk_nvme_ctrlr *ctrlr), NULL)
+
 int
 nvme_ctrlr_add_process(struct spdk_nvme_ctrlr *ctrlr, void *devhandle)
 {

test/unit/lib/nvme/nvme_ns_ocssd_cmd.c/nvme_ns_ocssd_cmd_ut.c

@@ -68,6 +68,8 @@ nvme_ctrlr_proc_get_ref(struct spdk_nvme_ctrlr *ctrlr)
 	return;
 }
 
+DEFINE_STUB(spdk_nvme_ctrlr_get_current_process, struct spdk_nvme_ctrlr_process *,
+	    (struct spdk_nvme_ctrlr *ctrlr), NULL)
 
 int
 nvme_ctrlr_process_init(struct spdk_nvme_ctrlr *ctrlr)