Provided by: dpdk-doc_24.11.2-2_all 
NAME
rte_malloc.h
SYNOPSIS
#include <stdio.h>
#include <stddef.h>
#include <rte_memory.h>
Data Structures
struct rte_malloc_socket_stats
Macros
#define __rte_dealloc_free __rte_dealloc(rte_free, 1)
Functions
void rte_free (void *ptr)
void * rte_malloc (const char *type, size_t size, unsigned align) __rte_alloc_size(2)
__rte_alloc_align(3) __rte_malloc __rte_dealloc_free
void * rte_zmalloc (const char *type, size_t size, unsigned align) __rte_alloc_size(2)
__rte_alloc_align(3) __rte_malloc __rte_dealloc_free
void * rte_calloc (const char *type, size_t num, size_t size, unsigned align) __rte_alloc_size(2
void * rte_realloc (void *ptr, size_t size, unsigned int align) __rte_alloc_size(2) __rte_alloc_align(3)
__rte_malloc __rte_dealloc_free
void * rte_realloc_socket (void *ptr, size_t size, unsigned int align, int socket) __rte_alloc_size(2)
__rte_alloc_align(3) __rte_malloc __rte_dealloc_free
void * rte_malloc_socket (const char *type, size_t size, unsigned align, int socket) __rte_alloc_size(2)
__rte_alloc_align(3) __rte_malloc __rte_dealloc_free
void * rte_zmalloc_socket (const char *type, size_t size, unsigned align, int socket) __rte_alloc_size(2)
__rte_alloc_align(3) __rte_malloc __rte_dealloc_free
void * rte_calloc_socket (const char *type, size_t num, size_t size, unsigned align, int socket)
__rte_alloc_size(2
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.
Macro Definition Documentation
#define __rte_dealloc_free __rte_dealloc(rte_free, 1)
Functions that expect return value to be freed with rte_free()
Definition at line 37 of file rte_malloc.h.
Function Documentation
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.
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 tracing). 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 tracing). 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 tracing). 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 * 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 tracing). 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 tracing). 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 tracing). 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.
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 Deprecated parameter unused.
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
Generated automatically by Doxygen for DPDK from the source code.
DPDK Version 24.11.2 rte_malloc.h(3)