[dpdk-dev] [PATCH v1 2/2] vfio: add errno on unsupported platforms

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

Currently, when code is running on FreeBSD (or using fallback Linux
implementation), there is no way to distinguish between a geniune error
and a "VFIO is unsupported" error. Fix the dummy implemnetations to also
set the rte_errno flag.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/eal/freebsd/eal.c    | 12 ++++++++++++
 lib/eal/linux/eal_vfio.c | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/lib/eal/freebsd/eal.c b/lib/eal/freebsd/eal.c
index 6cee5ae369..6d249edb11 100644
--- a/lib/eal/freebsd/eal.c
+++ b/lib/eal/freebsd/eal.c
@@ -1000,6 +1000,7 @@ 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;
 }
 
@@ -1007,11 +1008,13 @@ 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;
 }
 
@@ -1035,30 +1038,35 @@ 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;
 }
 
@@ -1066,6 +1074,7 @@ int
 rte_vfio_container_group_bind(__rte_unused int container_fd,
 		__rte_unused int iommu_group_num)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1073,6 +1082,7 @@ int
 rte_vfio_container_group_unbind(__rte_unused int container_fd,
 		__rte_unused int iommu_group_num)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -1082,6 +1092,7 @@ 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;
 }
 
@@ -1091,5 +1102,6 @@ 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/linux/eal_vfio.c b/lib/eal/linux/eal_vfio.c
index b9e4d3ad3c..bb4c225aed 100644
--- a/lib/eal/linux/eal_vfio.c
+++ b/lib/eal/linux/eal_vfio.c
@@ -2092,6 +2092,7 @@ 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;
 }
 
@@ -2099,12 +2100,14 @@ 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;
 }
 
@@ -2131,30 +2134,35 @@ 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;
 }
 
@@ -2162,6 +2170,7 @@ int
 rte_vfio_container_group_bind(__rte_unused int container_fd,
 		__rte_unused int iommu_group_num)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -2169,6 +2178,7 @@ int
 rte_vfio_container_group_unbind(__rte_unused int container_fd,
 		__rte_unused int iommu_group_num)
 {
+	rte_errno = ENOTSUP;
 	return -1;
 }
 
@@ -2178,6 +2188,7 @@ 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;
 }
 
@@ -2187,6 +2198,7 @@ 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