[dpdk-dev] [PATCH v3 4/4] vfio: add errno on unsupported platforms

[Anatoly Burakov <anatoly.burakov@intel.com>]

Currently, when code is running on FreeBSD or Windows,, there is no way
to distinguish between a geniune error and a "VFIO is unsupported"
error. Fix the dummy implementations to also set the rte_errno flag.

Cc: stable@dpdk.org
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Chenbo Xia <chenbo.xia@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/eal/freebsd/eal.c | 13 +++++++++++++
 lib/eal/windows/eal.c |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/lib/eal/freebsd/eal.c b/lib/eal/freebsd/eal.c
index dada210b19..fce13accc8 100644
--- a/lib/eal/freebsd/eal.c
+++ b/lib/eal/freebsd/eal.c
@@ -1005,6 +1005,7 @@ int rte_vfio_setup_device(__rte_unused const char *sysfs_base,
 		      __rte_unused int *vfio_dev_fd,
 		      __rte_unused struct vfio_device_info *device_info)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1012,11 +1013,13 @@ int rte_vfio_release_device(__rte_unused const char *sysfs_base,
 			__rte_unused const char *dev_addr,
 			__rte_unused int fd)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
 int rte_vfio_enable(__rte_unused const char *modname)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1032,6 +1035,7 @@ int rte_vfio_noiommu_is_enabled(void)
 
 int rte_vfio_clear_group(__rte_unused int vfio_group_fd)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1040,30 +1044,35 @@ rte_vfio_get_group_num(__rte_unused const char *sysfs_base,
 		       __rte_unused const char *dev_addr,
 		       __rte_unused int *iommu_group_num)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
 int
 rte_vfio_get_container_fd(void)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
 int
 rte_vfio_get_group_fd(__rte_unused int iommu_group_num)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
 int
 rte_vfio_container_create(void)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
 int
 rte_vfio_container_destroy(__rte_unused int container_fd)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1071,6 +1080,7 @@ int
 rte_vfio_container_group_bind(__rte_unused int container_fd,
 		__rte_unused int iommu_group_num)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1078,6 +1088,7 @@ int
 rte_vfio_container_group_unbind(__rte_unused int container_fd,
 		__rte_unused int iommu_group_num)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1087,6 +1098,7 @@ rte_vfio_container_dma_map(__rte_unused int container_fd,
 			__rte_unused uint64_t iova,
 			__rte_unused uint64_t len)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1096,5 +1108,6 @@ rte_vfio_container_dma_unmap(__rte_unused int container_fd,
 			__rte_unused uint64_t iova,
 			__rte_unused uint64_t len)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
diff --git a/lib/eal/windows/eal.c b/lib/eal/windows/eal.c
index f7ce1b6671..67db7f099a 100644
--- a/lib/eal/windows/eal.c
+++ b/lib/eal/windows/eal.c
@@ -481,6 +481,7 @@ rte_vfio_container_dma_map(__rte_unused int container_fd,
 			__rte_unused uint64_t iova,
 			__rte_unused uint64_t len)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -490,6 +491,7 @@ rte_vfio_container_dma_unmap(__rte_unused int container_fd,
 			__rte_unused uint64_t iova,
 			__rte_unused uint64_t len)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
-- 
2.25.1