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rte_eal_paging.h(3) DPDK rte_eal_paging.h(3)

NAME

rte_eal_paging.h

SYNOPSIS

#include <stdint.h>
#include <rte_compat.h>

Enumerations


enum rte_mem_prot { RTE_PROT_READ = 1 << 0, RTE_PROT_WRITE = 1 << 1, RTE_PROT_EXECUTE = 1 << 2 }
enum rte_map_flags { RTE_MAP_SHARED = 1 << 0, RTE_MAP_ANONYMOUS = 1 << 1, RTE_MAP_PRIVATE = 1 << 2, RTE_MAP_FORCE_ADDRESS = 1 << 3 }

Functions


__rte_internal void * rte_mem_map (void *requested_addr, size_t size, int prot, int flags, int fd, uint64_t offset)
__rte_internal int rte_mem_unmap (void *virt, size_t size)
__rte_internal size_t rte_mem_page_size (void)
__rte_internal int rte_mem_lock (const void *virt, size_t size)

Enumeration Type Documentation

enum rte_mem_prot

Memory protection flags.

Enumerator

Read access.
Write access.
Code execution.

Definition at line 17 of file rte_eal_paging.h.

enum rte_map_flags

Additional flags for memory mapping.

Enumerator

Changes to the mapped memory are visible to other processes.
Mapping is not backed by a regular file.
Copy-on-write mapping, changes are invisible to other processes.
Force mapping to the requested address. This flag should be used with caution, because to fulfill the request implementation may remove all other mappings in the requested region. However, it is not required to do so, thus mapping with this flag may fail.

Definition at line 24 of file rte_eal_paging.h.

Function Documentation

__rte_internal void* rte_mem_map (void * requested_addr, size_t size, int prot, int flags, int fd, uint64_t offset)

Map a portion of an opened file or the page file into memory.

This function is similar to POSIX mmap(3) with common MAP_ANONYMOUS extension, except for the return value.

Parameters

requested_addr Desired virtual address for mapping. Can be NULL to let OS choose.
size Size of the mapping in bytes.
prot Protection flags, a combination of rte_mem_prot values.
flags Additional mapping flags, a combination of rte_map_flags.
fd Mapped file descriptor. Can be negative for anonymous mapping.
offset Offset of the mapped region in fd. Must be 0 for anonymous mappings.

Returns

Mapped address or NULL on failure and rte_errno is set to OS error.

__rte_internal int rte_mem_unmap (void * virt, size_t size)

OS-independent implementation of POSIX munmap(3).

__rte_internal size_t rte_mem_page_size (void)

Get system page size. This function never fails.

Returns

Page size in bytes.

__rte_internal int rte_mem_lock (const void * virt, size_t size)

Lock in physical memory all pages crossed by the address region.

Parameters

virt Base virtual address of the region.
size Size of the region.

Returns

0 on success, negative on error.

See also

rte_mem_page_size() to retrieve the page size.

rte_mem_lock_page() to lock an entire single page.

Author

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Fri Dec 15 2023 Version 23.11.0