[dpdk-dev] [PATCH] eal/vfio: export all VFIO functions when not compiling VFIO

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

Previously, VFIO functions were not compiled in and exported if
VFIO compilation was disabled. Fix this by actually compiling
all of the functions unconditionally, , and provide missing
prototypes on Linux.

Fixes: 279b581c897d ("vfio: expose functions")
Fixes: 73a639085938 ("vfio: allow to map other memory regions")
Fixes: 964b2f3bfb07 ("vfio: export some internal functions")
Cc: hemant.agrawal@nxp.com
Cc: gaetan.rivet@6wind.com
Cc: anatoly.burakov@intel.com

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_eal/bsdapp/eal/eal.c          | 15 +-------
 lib/librte_eal/common/include/rte_vfio.h | 17 +++++----
 lib/librte_eal/linuxapp/eal/eal_vfio.c   | 60 ++++++++++++++++++++++++++++++++
 3 files changed, 72 insertions(+), 20 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/eal.c b/lib/librte_eal/bsdapp/eal/eal.c
index bfbec0d..d996190 100644
--- a/lib/librte_eal/bsdapp/eal/eal.c
+++ b/lib/librte_eal/bsdapp/eal/eal.c
@@ -40,6 +40,7 @@
 #include <rte_dev.h>
 #include <rte_devargs.h>
 #include <rte_version.h>
+#include <rte_vfio.h>
 #include <rte_atomic.h>
 #include <malloc_heap.h>
 
@@ -756,20 +757,6 @@ rte_eal_vfio_intr_mode(void)
 	return RTE_INTR_MODE_NONE;
 }
 
-/* dummy forward declaration. */
-struct vfio_device_info;
-
-/* dummy prototypes. */
-int rte_vfio_setup_device(const char *sysfs_base, const char *dev_addr,
-		int *vfio_dev_fd, struct vfio_device_info *device_info);
-int rte_vfio_release_device(const char *sysfs_base, const char *dev_addr, int fd);
-int rte_vfio_enable(const char *modname);
-int rte_vfio_is_enabled(const char *modname);
-int rte_vfio_noiommu_is_enabled(void);
-int rte_vfio_clear_group(int vfio_group_fd);
-int rte_vfio_dma_map(uint64_t vaddr, uint64_t iova, uint64_t len);
-int rte_vfio_dma_unmap(uint64_t vaddr, uint64_t iova, uint64_t len);
-
 int rte_vfio_setup_device(__rte_unused const char *sysfs_base,
 		      __rte_unused const char *dev_addr,
 		      __rte_unused int *vfio_dev_fd,
diff --git a/lib/librte_eal/common/include/rte_vfio.h b/lib/librte_eal/common/include/rte_vfio.h
index c4a2e60..899baef 100644
--- a/lib/librte_eal/common/include/rte_vfio.h
+++ b/lib/librte_eal/common/include/rte_vfio.h
@@ -33,10 +33,6 @@
 #define VFIO_NOIOMMU_MODE      \
 	"/sys/module/vfio/parameters/enable_unsafe_noiommu_mode"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* NOIOMMU is defined from kernel version 4.5 onwards */
 #ifdef VFIO_NOIOMMU_IOMMU
 #define RTE_VFIO_NOIOMMU VFIO_NOIOMMU_IOMMU
@@ -44,6 +40,17 @@ extern "C" {
 #define RTE_VFIO_NOIOMMU 8
 #endif
 
+#else /* not VFIO_PRESENT */
+
+/* we don't need an actual definition, only pointer is used */
+struct vfio_device_info;
+
+#endif /* VFIO_PRESENT */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * Setup vfio_cfg for the device identified by its address.
  * It discovers the configured I/O MMU groups or sets a new one for the device.
@@ -249,6 +256,4 @@ rte_vfio_get_group_fd(int iommu_group_num);
 }
 #endif
 
-#endif /* VFIO_PRESENT */
-
 #endif /* _RTE_VFIO_H_ */
diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c b/lib/librte_eal/linuxapp/eal/eal_vfio.c
index 16ee730..19b3841 100644
--- a/lib/librte_eal/linuxapp/eal/eal_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c
@@ -1547,4 +1547,64 @@ rte_vfio_dma_unmap(uint64_t __rte_unused vaddr, uint64_t __rte_unused iova,
 	return -1;
 }
 
+int
+rte_vfio_setup_device(__rte_unused const char *sysfs_base,
+		__rte_unused const char *dev_addr,
+		__rte_unused int *vfio_dev_fd,
+		__rte_unused struct vfio_device_info *device_info)
+{
+	return -1;
+}
+
+int
+rte_vfio_release_device(__rte_unused const char *sysfs_base,
+		__rte_unused const char *dev_addr, __rte_unused int fd)
+{
+	return -1;
+}
+
+int
+rte_vfio_enable(__rte_unused const char *modname)
+{
+	return -1;
+}
+
+int
+rte_vfio_is_enabled(__rte_unused const char *modname)
+{
+	return -1;
+}
+
+int
+rte_vfio_noiommu_is_enabled(void)
+{
+	return -1;
+}
+
+int
+rte_vfio_clear_group(__rte_unused int vfio_group_fd)
+{
+	return -1;
+}
+
+int __rte_experimental
+rte_vfio_get_group_num(__rte_unused const char *sysfs_base,
+		__rte_unused const char *dev_addr,
+		__rte_unused int *iommu_group_num)
+{
+	return -1;
+}
+
+int __rte_experimental
+rte_vfio_get_container_fd(void)
+{
+	return -1;
+}
+
+int __rte_experimental
+rte_vfio_get_group_fd(__rte_unused int iommu_group_num)
+{
+	return -1;
+}
+
 #endif
-- 
2.7.4