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  4. rte_vfio.h(3)

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rte_vfio.h(3) DPDK rte_vfio.h(3)

NAME

rte_vfio.h

SYNOPSIS

#include <stdbool.h>
#include <stdint.h>
#include <linux/vfio.h>

Functions


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_get_group_num (const char *sysfs_base, const char *dev_addr, int *iommu_group_num)
int rte_vfio_get_container_fd (void)
int rte_vfio_get_group_fd (int iommu_group_num)
int rte_vfio_container_create (void)
int rte_vfio_container_destroy (int container_fd)
int rte_vfio_container_group_bind (int container_fd, int iommu_group_num)
int rte_vfio_container_group_unbind (int container_fd, int iommu_group_num)
int rte_vfio_container_dma_map (int container_fd, uint64_t vaddr, uint64_t iova, uint64_t len)
int rte_vfio_container_dma_unmap (int container_fd, uint64_t vaddr, uint64_t iova, uint64_t len)

Detailed Description

RTE VFIO. This library provides various VFIO related utility functions.

Definition in file rte_vfio.h.

Function Documentation

int rte_vfio_setup_device (const char * sysfs_base, const char * dev_addr, int * vfio_dev_fd, struct vfio_device_info * device_info)

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. If a new groups is assigned, the DMA mapping is performed.

This function is only relevant to linux and will return an error on BSD.

Parameters:

sysfs_base sysfs path prefix.
dev_addr device location.
vfio_dev_fd VFIO fd.
device_info Device information.

Returns:

0 on success. <0 on failure. >1 if the device cannot be managed this way.

int rte_vfio_release_device (const char * sysfs_base, const char * dev_addr, int fd)

Release a device mapped to a VFIO-managed I/O MMU group.

This function is only relevant to linux and will return an error on BSD.

Parameters:

sysfs_base sysfs path prefix.
dev_addr device location.
fd VFIO fd.

Returns:

0 on success. <0 on failure.

int rte_vfio_enable (const char * modname)

Enable a VFIO-related kmod.

This function is only relevant to linux and will return an error on BSD.

Parameters:

modname kernel module name.

Returns:

0 on success. <0 on failure.

int rte_vfio_is_enabled (const char * modname)

Check whether a VFIO-related kmod is enabled.

This function is only relevant to Linux.

Parameters:

modname kernel module name.

Returns:

1 if true. 0 otherwise.

int rte_vfio_noiommu_is_enabled (void)

Whether VFIO NOIOMMU mode is enabled.

This function is only relevant to Linux.

Returns:

1 if true. 0 if false. <0 for errors.

int rte_vfio_clear_group (int vfio_group_fd)

Remove group fd from internal VFIO group fd array/

This function is only relevant to linux and will return an error on BSD.

Parameters:

vfio_group_fd VFIO Group FD.

Returns:

0 on success. <0 on failure.

int rte_vfio_get_group_num (const char * sysfs_base, const char * dev_addr, int * iommu_group_num)

Parse IOMMU group number for a device

This function is only relevant to linux and will return an error on BSD.

Parameters:

sysfs_base sysfs path prefix.
dev_addr device location.
iommu_group_num iommu group number

Returns:

>0 on success 0 for non-existent group or VFIO <0 for errors

int rte_vfio_get_container_fd (void)

Open a new VFIO container fd

This function is only relevant to linux and will return an error on BSD.

Returns:

0 container fd

< 0 for errors

int rte_vfio_get_group_fd (int iommu_group_num)

Open VFIO group fd or get an existing one

This function is only relevant to linux and will return an error on BSD.

Parameters:

iommu_group_num iommu group number

Returns:

0 group fd

< 0 for errors

int rte_vfio_container_create (void)

Create a new container for device binding.

Note:

Any newly allocated DPDK memory will not be mapped into these containers by default, user needs to manage DMA mappings for any container created by this API.

When creating containers using this API, the container will only be available in the process that has created it. Sharing containers and devices between multiple processes is not supported.

Returns:

the container fd if successful <0 if failed

int rte_vfio_container_destroy (int container_fd)

Destroy the container, unbind all vfio groups within it.

Parameters:

container_fd the container fd to destroy

Returns:

0 if successful <0 if failed

int rte_vfio_container_group_bind (int container_fd, int iommu_group_num)

Bind a IOMMU group to a container.

Parameters:

container_fd the container's fd
iommu_group_num the iommu group number to bind to container

Returns:

group fd if successful <0 if failed

int rte_vfio_container_group_unbind (int container_fd, int iommu_group_num)

Unbind a IOMMU group from a container.

Parameters:

container_fd the container fd of container
iommu_group_num the iommu group number to delete from container

Returns:

0 if successful <0 if failed

int rte_vfio_container_dma_map (int container_fd, uint64_t vaddr, uint64_t iova, uint64_t len)

Perform DMA mapping for devices in a container.

Parameters:

container_fd the specified container fd. Use RTE_VFIO_DEFAULT_CONTAINER_FD to use the default container.
vaddr Starting virtual address of memory to be mapped.
iova Starting IOVA address of memory to be mapped.
len Length of memory segment being mapped.

Returns:

0 if successful <0 if failed

int rte_vfio_container_dma_unmap (int container_fd, uint64_t vaddr, uint64_t iova, uint64_t len)

Perform DMA unmapping for devices in a container.

Parameters:

container_fd the specified container fd. Use RTE_VFIO_DEFAULT_CONTAINER_FD to use the default container.
vaddr Starting virtual address of memory to be unmapped.
iova Starting IOVA address of memory to be unmapped.
len Length of memory segment being unmapped.

Returns:

0 if successful <0 if failed

Author

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Thu May 23 2024 Version 23.11.0