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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 Macros #define __rte_dealloc_free __rte_dealloc(rte_free, 1) Functions void rte_free (void *ptr) __rte_experimental void rte_free_sensitive (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. __rte_experimental void rte_free_sensitive (void * ptr) Warning EXPERIMENTAL: this API may change without prior notice. Frees the memory space pointed to by the provided pointer and guarantees it will be zero'd before reuse. This function is slower than simple rte_free() it should only be used for security keys and other sensitive data. 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. Version 25.11.0 Thu Jun 11 2026 rte_malloc.h(3)
NAME | SYNOPSIS | Detailed Description | Macro Definition Documentation | Function Documentation | Author
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