[PATCH] vmbus: get current rte_vmbus_bus struct

[Abdelfattah Chehab]

Hi All,
FOREACH_DEVICE_ON_VMBUS needs rte_vmbus_bus to work on
If static link to libdpdk.a : no issues
If dynamic link to *.so: linker issue, global variable not found.

I suggest this patch to get a current rte_vmbus_bus struct:
Thanks.


diff --git a/dpdk-20.11/drivers/bus/vmbus/rte_bus_vmbus.h 
b/dpdk-20.11/drivers/bus/vmbus/rte_bus_vmbus.h
--- a/dpdk-20.11/drivers/bus/vmbus/rte_bus_vmbus.h
+++ b/dpdk-20.11/drivers/bus/vmbus/rte_bus_vmbus.h
@@ -414,6 +414,16 @@
               }                                                                
                              \
               RTE_PMD_EXPORT_NAME(nm, __COUNTER__)
+/**
+ * Gets the global rte_vmbus_bus struct
+ *
+ * @param bus
+ *          Pointer to rte_vmbus_bus structure.
+ * @return
+ *          Return 0 if success.
+ */
+int rte_vmbus_get_bus(struct rte_vmbus_bus *bus);
+
#ifdef __cplusplus
}
#endif
diff --git a/dpdk-20.11/drivers/bus/vmbus/version.map 
b/dpdk-20.11/drivers/bus/vmbus/version.map
--- a/dpdk-20.11/drivers/bus/vmbus/version.map
+++ b/dpdk-20.11/drivers/bus/vmbus/version.map
@@ -23,6 +23,7 @@
               rte_vmbus_subchan_open;
               rte_vmbus_unmap_device;
               rte_vmbus_unregister;
+             rte_vmbus_get_bus;
                local: *;
};
diff --git a/dpdk-20.11/drivers/bus/vmbus/vmbus_common.c 
b/dpdk-20.11/drivers/bus/vmbus/vmbus_common.c
--- a/dpdk-20.11/drivers/bus/vmbus/vmbus_common.c
+++ b/dpdk-20.11/drivers/bus/vmbus/vmbus_common.c
@@ -25,6 +25,17 @@
 extern struct rte_vmbus_bus rte_vmbus_bus;
+/* Gets the global rte_vmbus_bus struct*/
+int rte_vmbus_get_bus(struct rte_vmbus_bus *bus){
+
+  if (!bus)
+    return 1;
+
+  memcpy(bus, &rte_vmbus_bus, sizeof(struct rte_vmbus_bus));
+
+  return 0;
+}
+
/* map a particular resource from a file */
void *
vmbus_map_resource(void *requested_addr, int fd, off_t offset, size_t size,