[dpdk-dev] [PATCH v4 1/6] vfio: allow DMA map of memory for the default vfio fd
Shahaf Shuler
shahafs at mellanox.com
Sun Mar 10 09:27:58 CET 2019
Enable users the option to call rte_vfio_dma_map with request to map
to the default vfio fd.
Signed-off-by: Shahaf Shuler <shahafs at mellanox.com>
Acked-by: Anatoly Burakov <anatoly.burakov at 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
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