Function malloc_heap_create_external_seg

dpdk/lib/eal/common/malloc_heap.c:1181–1242

}

struct rte_memseg_list *
malloc_heap_create_external_seg(void *va_addr, rte_iova_t iova_addrs[],
		unsigned int n_pages, size_t page_sz, const char *seg_name,
		unsigned int socket_id)
{
	struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
	char fbarray_name[RTE_FBARRAY_NAME_LEN];
	struct rte_memseg_list *msl = NULL;
	struct rte_fbarray *arr;
	size_t seg_len = n_pages * page_sz;
	unsigned int i;

	/* first, find a free memseg list */
	for (i = 0; i < RTE_MAX_MEMSEG_LISTS; i++) {
		struct rte_memseg_list *tmp = &mcfg->memsegs[i];
		if (tmp->base_va == NULL) {
			msl = tmp;
			break;
		}
	}
	if (msl == NULL) {
		RTE_LOG(ERR, EAL, "Couldn't find empty memseg list\n");
		rte_errno = ENOSPC;
		return NULL;
	}

	snprintf(fbarray_name, sizeof(fbarray_name), "%s_%p",
			seg_name, va_addr);

	/* create the backing fbarray */
	if (rte_fbarray_init(&msl->memseg_arr, fbarray_name, n_pages,
			sizeof(struct rte_memseg)) < 0) {
		RTE_LOG(ERR, EAL, "Couldn't create fbarray backing the memseg list\n");
		return NULL;
	}
	arr = &msl->memseg_arr;

	/* fbarray created, fill it up */
	for (i = 0; i < n_pages; i++) {
		struct rte_memseg *ms;

		rte_fbarray_set_used(arr, i);
		ms = rte_fbarray_get(arr, i);
		ms->addr = RTE_PTR_ADD(va_addr, i * page_sz);
		ms->iova = iova_addrs == NULL ? RTE_BAD_IOVA : iova_addrs[i];
		ms->hugepage_sz = page_sz;
		ms->len = page_sz;
		ms->nchannel = rte_memory_get_nchannel();
		ms->nrank = rte_memory_get_nrank();
		ms->socket_id = socket_id;
	}

	/* set up the memseg list */
	msl->base_va = va_addr;
	msl->page_sz = page_sz;
	msl->socket_id = socket_id;
	msl->len = seg_len;
	msl->version = 0;