[dpdk-stable] [PATCH] vfio: fix getting default container

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

When requesting DMA mapping to default container, we are meant to
supply the RTE_VFIO_DEFAULT_CONTAINER_FD value, however this is
not handled correctly by get_vfio_cfg_by_container_fd(), because
it only looks at actual fd values and does not check for this
special case.

Fix it to return default container if the fd requested is the
special RTE_VFIO_DEFAULT_CONTAINER_FD value.

Fixes: 4f5519ed8349 ("vfio: cleanup getting group fd")
Cc: dariuszx.stojaczyk@intel.com
Cc: stable@dpdk.org

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_eal/linux/eal/eal_vfio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/librte_eal/linux/eal/eal_vfio.c b/lib/librte_eal/linux/eal/eal_vfio.c
index d9541b1220..d7887388f9 100644
--- a/lib/librte_eal/linux/eal/eal_vfio.c
+++ b/lib/librte_eal/linux/eal/eal_vfio.c
@@ -412,6 +412,9 @@ get_vfio_cfg_by_container_fd(int container_fd)
 {
 	int i;
 
+	if (container_fd == RTE_VFIO_DEFAULT_CONTAINER_FD)
+		return default_vfio_cfg;
+
 	for (i = 0; i < VFIO_MAX_CONTAINERS; i++) {
 		if (vfio_cfgs[i].vfio_container_fd == container_fd)
 			return &vfio_cfgs[i];
-- 
2.17.1