+static unsigned int
+setup_extbuf(uint32_t nb_mbufs, uint16_t mbuf_sz, unsigned int socket_id,
+ char *pool_name, struct rte_pktmbuf_extmem **ext_mem)
+{
+ struct rte_pktmbuf_extmem *xmem;
+ unsigned int ext_num, zone_num, elt_num;
+ uint16_t elt_size;
+
+ elt_size = RTE_ALIGN_CEIL(mbuf_sz, RTE_CACHE_LINE_SIZE);
+ elt_num = EXTBUF_ZONE_SIZE / elt_size;
+ zone_num = (nb_mbufs + elt_num - 1) / elt_num;
+
+ xmem = malloc(sizeof(struct rte_pktmbuf_extmem) * zone_num);
+ if (xmem == NULL) {
+ TESTPMD_LOG(ERR, "Cannot allocate memory for "
+ "external buffer descriptors\n");
+ *ext_mem = NULL;
+ return 0;
+ }
+ for (ext_num = 0; ext_num < zone_num; ext_num++) {
+ struct rte_pktmbuf_extmem *xseg = xmem + ext_num;
+ const struct rte_memzone *mz;
+ char mz_name[RTE_MEMZONE_NAMESIZE];
+ int ret;
+
+ ret = snprintf(mz_name, sizeof(mz_name),
+ RTE_MEMPOOL_MZ_FORMAT "_xb_%u", pool_name, ext_num);
+ if (ret < 0 || ret >= (int)sizeof(mz_name)) {
+ errno = ENAMETOOLONG;
+ ext_num = 0;
+ break;
+ }
+ mz = rte_memzone_reserve_aligned(mz_name, EXTBUF_ZONE_SIZE,
+ socket_id,
+ RTE_MEMZONE_IOVA_CONTIG |
+ RTE_MEMZONE_1GB |
+ RTE_MEMZONE_SIZE_HINT_ONLY,
+ EXTBUF_ZONE_SIZE);
+ if (mz == NULL) {
+ /*
+ * The caller exits on external buffer creation
+ * error, so there is no need to free memzones.
+ */
+ errno = ENOMEM;
+ ext_num = 0;
+ break;
+ }
+ xseg->buf_ptr = mz->addr;
+ xseg->buf_iova = mz->iova;
+ xseg->buf_len = EXTBUF_ZONE_SIZE;
+ xseg->elt_size = elt_size;
+ }
+ if (ext_num == 0 && xmem != NULL) {
+ free(xmem);
+ xmem = NULL;
+ }
+ *ext_mem = xmem;
+ return ext_num;
+}
+