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rte_malloc.h(3) DPDK rte_malloc.h(3)

NAME

rte_malloc.h

SYNOPSIS

#include <stdio.h>
#include <stddef.h>
#include <rte_memory.h>

Data Structures


struct rte_malloc_socket_stats

Functions


void * rte_malloc (const char *type, size_t size, unsigned align) __rte_alloc_size(2)
void * rte_zmalloc (const char *type, size_t size, unsigned align) __rte_alloc_size(2)
void * rte_calloc (const char *type, size_t num, size_t size, unsigned align) __rte_alloc_size(2
void void * rte_realloc (void *ptr, size_t size, unsigned int align) __rte_alloc_size(2)
void * rte_realloc_socket (void *ptr, size_t size, unsigned int align, int socket) __rte_alloc_size(2)
void * rte_malloc_socket (const char *type, size_t size, unsigned align, int socket) __rte_alloc_size(2)
void * rte_zmalloc_socket (const char *type, size_t size, unsigned align, int socket) __rte_alloc_size(2)
void * rte_calloc_socket (const char *type, size_t num, size_t size, unsigned align, int socket) __rte_alloc_size(2
void void rte_free (void *ptr)
int rte_malloc_validate (const void *ptr, size_t *size)
int rte_malloc_get_socket_stats (int socket, struct rte_malloc_socket_stats *socket_stats)
int rte_malloc_heap_memory_add (const char *heap_name, void *va_addr, size_t len, rte_iova_t iova_addrs[], unsigned int n_pages, size_t page_sz)
int rte_malloc_heap_memory_remove (const char *heap_name, void *va_addr, size_t len)
int rte_malloc_heap_memory_attach (const char *heap_name, void *va_addr, size_t len)
int rte_malloc_heap_memory_detach (const char *heap_name, void *va_addr, size_t len)
int rte_malloc_heap_create (const char *heap_name)
int rte_malloc_heap_destroy (const char *heap_name)
int rte_malloc_heap_get_socket (const char *name)
int rte_malloc_heap_socket_is_external (int socket_id)
void rte_malloc_dump_stats (FILE *f, const char *type)
void rte_malloc_dump_heaps (FILE *f)
rte_iova_t rte_malloc_virt2iova (const void *addr)

Detailed Description

RTE Malloc. This library provides methods for dynamically allocating memory from hugepages.

Definition in file rte_malloc.h.

Function Documentation

void* rte_malloc (const char * type, size_t size, unsigned align)

This function allocates memory from the huge-page area of memory. The memory is not cleared. In NUMA systems, the memory allocated resides on the same NUMA socket as the core that calls this function.

Parameters:

type A string identifying the type of allocated objects (useful for debug purposes, such as identifying the cause of a memory leak). Can be NULL.
size Size (in bytes) to be allocated.
align If 0, the return is a pointer that is suitably aligned for any kind of variable (in the same manner as malloc()). Otherwise, the return is a pointer that is a multiple of align. In this case, it must be a power of two. (Minimum alignment is the cacheline size, i.e. 64-bytes)

Returns:

  • NULL on error. Not enough memory, or invalid arguments (size is 0, align is not a power of two).
  • Otherwise, the pointer to the allocated object.

void* rte_zmalloc (const char * type, size_t size, unsigned align)

Allocate zeroed memory from the heap.

Equivalent to rte_malloc() except that the memory zone is initialised with zeros. In NUMA systems, the memory allocated resides on the same NUMA socket as the core that calls this function.

Parameters:

type A string identifying the type of allocated objects (useful for debug purposes, such as identifying the cause of a memory leak). Can be NULL.
size Size (in bytes) to be allocated.
align If 0, the return is a pointer that is suitably aligned for any kind of variable (in the same manner as malloc()). Otherwise, the return is a pointer that is a multiple of align. In this case, it must obviously be a power of two. (Minimum alignment is the cacheline size, i.e. 64-bytes)

Returns:

  • NULL on error. Not enough memory, or invalid arguments (size is 0, align is not a power of two).
  • Otherwise, the pointer to the allocated object.

void* rte_calloc (const char * type, size_t num, size_t size, unsigned align)

Replacement function for calloc(), using huge-page memory. Memory area is initialised with zeros. In NUMA systems, the memory allocated resides on the same NUMA socket as the core that calls this function.

Parameters:

type A string identifying the type of allocated objects (useful for debug purposes, such as identifying the cause of a memory leak). Can be NULL.
num Number of elements to be allocated.
size Size (in bytes) of a single element.
align If 0, the return is a pointer that is suitably aligned for any kind of variable (in the same manner as malloc()). Otherwise, the return is a pointer that is a multiple of align. In this case, it must obviously be a power of two. (Minimum alignment is the cacheline size, i.e. 64-bytes)

Returns:

  • NULL on error. Not enough memory, or invalid arguments (size is 0, align is not a power of two).
  • Otherwise, the pointer to the allocated object.

void void* rte_realloc (void * ptr, size_t size, unsigned int align)

Replacement function for realloc(), using huge-page memory. Reserved area memory is resized, preserving contents. In NUMA systems, the new area may not reside on the same NUMA node as the old one.

Parameters:

ptr Pointer to already allocated memory
size Size (in bytes) of new area. If this is 0, memory is freed.
align If 0, the return is a pointer that is suitably aligned for any kind of variable (in the same manner as malloc()). Otherwise, the return is a pointer that is a multiple of align. In this case, it must obviously be a power of two. (Minimum alignment is the cacheline size, i.e. 64-bytes)

Returns:

  • NULL on error. Not enough memory, or invalid arguments (size is 0, align is not a power of two).
  • Otherwise, the pointer to the reallocated memory.

void* rte_realloc_socket (void * ptr, size_t size, unsigned int align, int socket)

Replacement function for realloc(), using huge-page memory. Reserved area memory is resized, preserving contents. In NUMA systems, the new area resides on requested NUMA socket.

Parameters:

ptr Pointer to already allocated memory
size Size (in bytes) of new area. If this is 0, memory is freed.
align If 0, the return is a pointer that is suitably aligned for any kind of variable (in the same manner as malloc()). Otherwise, the return is a pointer that is a multiple of align. In this case, it must obviously be a power of two. (Minimum alignment is the cacheline size, i.e. 64-bytes)
socket NUMA socket to allocate memory on.

Returns:

  • NULL on error. Not enough memory, or invalid arguments (size is 0, align is not a power of two).
  • Otherwise, the pointer to the reallocated memory.

void* rte_malloc_socket (const char * type, size_t size, unsigned align, int socket)

This function allocates memory from the huge-page area of memory. The memory is not cleared.

Parameters:

type A string identifying the type of allocated objects (useful for debug purposes, such as identifying the cause of a memory leak). Can be NULL.
size Size (in bytes) to be allocated.
align If 0, the return is a pointer that is suitably aligned for any kind of variable (in the same manner as malloc()). Otherwise, the return is a pointer that is a multiple of align. In this case, it must be a power of two. (Minimum alignment is the cacheline size, i.e. 64-bytes)
socket NUMA socket to allocate memory on. If SOCKET_ID_ANY is used, this function will behave the same as rte_malloc().

Returns:

  • NULL on error. Not enough memory, or invalid arguments (size is 0, align is not a power of two).
  • Otherwise, the pointer to the allocated object.

void* rte_zmalloc_socket (const char * type, size_t size, unsigned align, int socket)

Allocate zeroed memory from the heap.

Equivalent to rte_malloc() except that the memory zone is initialised with zeros.

Parameters:

type A string identifying the type of allocated objects (useful for debug purposes, such as identifying the cause of a memory leak). Can be NULL.
size Size (in bytes) to be allocated.
align If 0, the return is a pointer that is suitably aligned for any kind of variable (in the same manner as malloc()). Otherwise, the return is a pointer that is a multiple of align. In this case, it must obviously be a power of two. (Minimum alignment is the cacheline size, i.e. 64-bytes)
socket NUMA socket to allocate memory on. If SOCKET_ID_ANY is used, this function will behave the same as rte_zmalloc().

Returns:

  • NULL on error. Not enough memory, or invalid arguments (size is 0, align is not a power of two).
  • Otherwise, the pointer to the allocated object.

void* rte_calloc_socket (const char * type, size_t num, size_t size, unsigned align, int socket)

Replacement function for calloc(), using huge-page memory. Memory area is initialised with zeros.

Parameters:

type A string identifying the type of allocated objects (useful for debug purposes, such as identifying the cause of a memory leak). Can be NULL.
num Number of elements to be allocated.
size Size (in bytes) of a single element.
align If 0, the return is a pointer that is suitably aligned for any kind of variable (in the same manner as malloc()). Otherwise, the return is a pointer that is a multiple of align. In this case, it must obviously be a power of two. (Minimum alignment is the cacheline size, i.e. 64-bytes)
socket NUMA socket to allocate memory on. If SOCKET_ID_ANY is used, this function will behave the same as rte_calloc().

Returns:

  • NULL on error. Not enough memory, or invalid arguments (size is 0, align is not a power of two).
  • Otherwise, the pointer to the allocated object.

void void rte_free (void * ptr)

Frees the memory space pointed to by the provided pointer.

This pointer must have been returned by a previous call to rte_malloc(), rte_zmalloc(), rte_calloc() or rte_realloc(). The behaviour of rte_free() is undefined if the pointer does not match this requirement.

If the pointer is NULL, the function does nothing.

Parameters:

ptr The pointer to memory to be freed.

int rte_malloc_validate (const void * ptr, size_t * size)

If malloc debug is enabled, check a memory block for header and trailer markers to indicate that all is well with the block. If size is non-null, also return the size of the block.

Parameters:

ptr pointer to the start of a data block, must have been returned by a previous call to rte_malloc(), rte_zmalloc(), rte_calloc() or rte_realloc()
size if non-null, and memory block pointer is valid, returns the size of the memory block

Returns:

-1 on error, invalid pointer passed or header and trailer markers are missing or corrupted 0 on success

int rte_malloc_get_socket_stats (int socket, struct rte_malloc_socket_stats * socket_stats)

Get heap statistics for the specified heap.

Note:

This function is not thread-safe with respect to rte_malloc_heap_create()/rte_malloc_heap_destroy() functions.

Parameters:

socket An unsigned integer specifying the socket to get heap statistics for
socket_stats A structure which provides memory to store statistics

Returns:

Null on error Pointer to structure storing statistics on success

int rte_malloc_heap_memory_add (const char * heap_name, void * va_addr, size_t len, rte_iova_t iova_addrs[], unsigned int n_pages, size_t page_sz)

Add memory chunk to a heap with specified name.

Note:

Multiple memory chunks can be added to the same heap

Before accessing this memory in other processes, it needs to be attached in each of those processes by calling rte_malloc_heap_memory_attach in each other process.

Memory must be previously allocated for DPDK to be able to use it as a malloc heap. Failing to do so will result in undefined behavior, up to and including segmentation faults.

Calling this function will erase any contents already present at the supplied memory address.

Parameters:

heap_name Name of the heap to add memory chunk to
va_addr Start of virtual area to add to the heap. Must be aligned by page_sz.
len Length of virtual area to add to the heap. Must be aligned by page_sz.
iova_addrs Array of page IOVA addresses corresponding to each page in this memory area. Can be NULL, in which case page IOVA addresses will be set to RTE_BAD_IOVA.
n_pages Number of elements in the iova_addrs array. Ignored if iova_addrs is NULL.
page_sz Page size of the underlying memory

Returns:

  • 0 on success
  • -1 in case of error, with rte_errno set to one of the following: EINVAL - one of the parameters was invalid EPERM - attempted to add memory to a reserved heap ENOSPC - no more space in internal config to store a new memory chunk

int rte_malloc_heap_memory_remove (const char * heap_name, void * va_addr, size_t len)

Remove memory chunk from heap with specified name.

Note:

Memory chunk being removed must be the same as one that was added; partially removing memory chunks is not supported

Memory area must not contain any allocated elements to allow its removal from the heap

All other processes must detach from the memory chunk prior to it being removed from the heap.

Parameters:

heap_name Name of the heap to remove memory from
va_addr Virtual address to remove from the heap
len Length of virtual area to remove from the heap

Returns:

  • 0 on success
  • -1 in case of error, with rte_errno set to one of the following: EINVAL - one of the parameters was invalid EPERM - attempted to remove memory from a reserved heap ENOENT - heap or memory chunk was not found EBUSY - memory chunk still contains data

int rte_malloc_heap_memory_attach (const char * heap_name, void * va_addr, size_t len)

Attach to an already existing chunk of external memory in another process.

Note:

This function must be called before any attempt is made to use an already existing external memory chunk. This function does not need to be called if a call to rte_malloc_heap_memory_add was made in the current process.

Parameters:

heap_name Heap name to which this chunk of memory belongs
va_addr Start address of memory chunk to attach to
len Length of memory chunk to attach to

Returns:

0 on successful attach -1 on unsuccessful attach, with rte_errno set to indicate cause for error: EINVAL - one of the parameters was invalid EPERM - attempted to attach memory to a reserved heap ENOENT - heap or memory chunk was not found

int rte_malloc_heap_memory_detach (const char * heap_name, void * va_addr, size_t len)

Detach from a chunk of external memory in secondary process.

Note:

This function must be called in before any attempt is made to remove external memory from the heap in another process. This function does not need to be called if a call to rte_malloc_heap_memory_remove will be called in current process.

Parameters:

heap_name Heap name to which this chunk of memory belongs
va_addr Start address of memory chunk to attach to
len Length of memory chunk to attach to

Returns:

0 on successful detach -1 on unsuccessful detach, with rte_errno set to indicate cause for error: EINVAL - one of the parameters was invalid EPERM - attempted to detach memory from a reserved heap ENOENT - heap or memory chunk was not found

int rte_malloc_heap_create (const char * heap_name)

Creates a new empty malloc heap with a specified name.

Note:

Heaps created via this call will automatically get assigned a unique socket ID, which can be found using rte_malloc_heap_get_socket()

Parameters:

heap_name Name of the heap to create.

Returns:

  • 0 on successful creation
  • -1 in case of error, with rte_errno set to one of the following: EINVAL - heap_name was NULL, empty or too long EEXIST - heap by name of heap_name already exists ENOSPC - no more space in internal config to store a new heap

int rte_malloc_heap_destroy (const char * heap_name)

Destroys a previously created malloc heap with specified name.

Note:

This function will return a failure result if not all memory allocated from the heap has been freed back to the heap

This function will return a failure result if not all memory segments were removed from the heap prior to its destruction

Parameters:

heap_name Name of the heap to create.

Returns:

  • 0 on success
  • -1 in case of error, with rte_errno set to one of the following: EINVAL - heap_name was NULL, empty or too long ENOENT - heap by the name of heap_name was not found EPERM - attempting to destroy reserved heap EBUSY - heap still contains data

int rte_malloc_heap_get_socket (const char * name)

Find socket ID corresponding to a named heap.

Parameters:

name Heap name to find socket ID for

Returns:

Socket ID in case of success (a non-negative number) -1 in case of error, with rte_errno set to one of the following: EINVAL - name was NULL ENOENT - heap identified by the name name was not found

int rte_malloc_heap_socket_is_external (int socket_id)

Check if a given socket ID refers to externally allocated memory.

Note:

Passing SOCKET_ID_ANY will return 0.

Parameters:

socket_id Socket ID to check

Returns:

1 if socket ID refers to externally allocated memory 0 if socket ID refers to internal DPDK memory -1 if socket ID is invalid

void rte_malloc_dump_stats (FILE * f, const char * type)

Dump statistics.

Dump for the specified type to a file. If the type argument is NULL, all memory types will be dumped.

Note:

This function is not thread-safe with respect to rte_malloc_heap_create()/rte_malloc_heap_destroy() functions.

Parameters:

f A pointer to a file for output
type A string identifying the type of objects to dump, or NULL to dump all objects.

void rte_malloc_dump_heaps (FILE * f)

Dump contents of all malloc heaps to a file.

Note:

This function is not thread-safe with respect to rte_malloc_heap_create()/rte_malloc_heap_destroy() functions.

Parameters:

f A pointer to a file for output

rte_iova_t rte_malloc_virt2iova (const void * addr)

Return the IO address of a virtual address obtained through rte_malloc

Parameters:

addr Address obtained from a previous rte_malloc call

Returns:

RTE_BAD_IOVA on error otherwise return an address suitable for IO

Author

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