vfio: fix API description

Fix few comments and add detailed comments for return value.

Fixes: 279b581c897d ("vfio: expose functions")
Cc: stable@dpdk.org
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

diff --git a/lib/librte_eal/include/rte_vfio.h b/lib/librte_eal/include/rte_vfio.h
index 20ed8c4..e7a8745 100644 (file)
--- a/lib/librte_eal/include/rte_vfio.h
+++ b/lib/librte_eal/include/rte_vfio.h
@@ -156,7 +156,7 @@ int rte_vfio_enable(const char *modname);
  *   kernel module name.
  *
  * @return
- *   !0 if true.
+ *   1 if true.
  *   0 otherwise.
  */
 int rte_vfio_is_enabled(const char *modname);
@@ -168,8 +168,9 @@ int rte_vfio_is_enabled(const char *modname);
  * an error on BSD.
  *
  * @return
- *   !0 if true.
- *   0 otherwise.
+ *   1 if true.
+ *   0 if false.
+ *   <0 for errors.
  */
 int rte_vfio_noiommu_is_enabled(void);