[dpdk-dev] [PATCH v4 1/6] vfio: allow DMA map of memory for the default vfio fd

[Shahaf Shuler]

Enable users the option to call rte_vfio_dma_map with request to map
to the default vfio fd.

Signed-off-by: Shahaf Shuler <shah...@mellanox.com>
Acked-by: Anatoly Burakov <anatoly.bura...@intel.com>
---
 doc/guides/rel_notes/release_19_05.rst   |  3 +++
 lib/librte_eal/common/include/rte_vfio.h |  8 ++++++--
 lib/librte_eal/linuxapp/eal/eal_vfio.c   | 10 ++++++++--
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/doc/guides/rel_notes/release_19_05.rst 
b/doc/guides/rel_notes/release_19_05.rst
index 61a2c73837..aa77b24bf5 100644
--- a/doc/guides/rel_notes/release_19_05.rst
+++ b/doc/guides/rel_notes/release_19_05.rst
@@ -136,6 +136,9 @@ ABI Changes
    Also, make sure to start the actual text at the margin.
    =========================================================
 
+* vfio: Functions ``rte_vfio_container_dma_map`` and
+  ``rte_vfio_container_dma_unmap`` have been extended with an option to
+  request mapping or un-mapping to the default vfio container fd.
 
 Shared Library Versions
 -----------------------
diff --git a/lib/librte_eal/common/include/rte_vfio.h 
b/lib/librte_eal/common/include/rte_vfio.h
index cae96fab90..cdfbedc1f9 100644
--- a/lib/librte_eal/common/include/rte_vfio.h
+++ b/lib/librte_eal/common/include/rte_vfio.h
@@ -80,6 +80,8 @@ struct vfio_device_info;
 
 #endif /* VFIO_PRESENT */
 
+#define RTE_VFIO_DEFAULT_CONTAINER_FD (-1)
+
 /**
  * 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.
@@ -347,7 +349,8 @@ rte_vfio_container_group_unbind(int container_fd, int 
iommu_group_num);
  * Perform DMA mapping for devices in a container.
  *
  * @param container_fd
- *   the specified container fd
+ *   the specified container fd. Use RTE_VFIO_DEFAULT_CONTAINER_FD to
+ *   use the default container.
  *
  * @param vaddr
  *   Starting virtual address of memory to be mapped.
@@ -370,7 +373,8 @@ rte_vfio_container_dma_map(int container_fd, uint64_t vaddr,
  * Perform DMA unmapping for devices in a container.
  *
  * @param container_fd
- *   the specified container fd
+ *   the specified container fd. Use RTE_VFIO_DEFAULT_CONTAINER_FD to
+ *   use the default container.
  *
  * @param vaddr
  *   Starting virtual address of memory to be unmapped.
diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c 
b/lib/librte_eal/linuxapp/eal/eal_vfio.c
index c821e83826..9adbda8bb7 100644
--- a/lib/librte_eal/linuxapp/eal/eal_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c
@@ -1897,7 +1897,10 @@ rte_vfio_container_dma_map(int container_fd, uint64_t 
vaddr, uint64_t iova,
                return -1;
        }
 
-       vfio_cfg = get_vfio_cfg_by_container_fd(container_fd);
+       if (container_fd == RTE_VFIO_DEFAULT_CONTAINER_FD)
+               vfio_cfg = default_vfio_cfg;
+       else
+               vfio_cfg = get_vfio_cfg_by_container_fd(container_fd);
        if (vfio_cfg == NULL) {
                RTE_LOG(ERR, EAL, "Invalid container fd\n");
                return -1;
@@ -1917,7 +1920,10 @@ rte_vfio_container_dma_unmap(int container_fd, uint64_t 
vaddr, uint64_t iova,
                return -1;
        }
 
-       vfio_cfg = get_vfio_cfg_by_container_fd(container_fd);
+       if (container_fd == RTE_VFIO_DEFAULT_CONTAINER_FD)
+               vfio_cfg = default_vfio_cfg;
+       else
+               vfio_cfg = get_vfio_cfg_by_container_fd(container_fd);
        if (vfio_cfg == NULL) {
                RTE_LOG(ERR, EAL, "Invalid container fd\n");
                return -1;
-- 
2.12.0