+static uint16_t
+eth_ena_prep_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
+ uint16_t nb_pkts)
+{
+ int32_t ret;
+ uint32_t i;
+ struct rte_mbuf *m;
+ struct ena_ring *tx_ring = (struct ena_ring *)(tx_queue);
+ struct ipv4_hdr *ip_hdr;
+ uint64_t ol_flags;
+ uint16_t frag_field;
+
+ for (i = 0; i != nb_pkts; i++) {
+ m = tx_pkts[i];
+ ol_flags = m->ol_flags;
+
+ if (!(ol_flags & PKT_TX_IPV4))
+ continue;
+
+ /* If there was not L2 header length specified, assume it is
+ * length of the ethernet header.
+ */
+ if (unlikely(m->l2_len == 0))
+ m->l2_len = sizeof(struct ether_hdr);
+
+ ip_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *,
+ m->l2_len);
+ frag_field = rte_be_to_cpu_16(ip_hdr->fragment_offset);
+
+ if ((frag_field & IPV4_HDR_DF_FLAG) != 0) {
+ m->packet_type |= RTE_PTYPE_L4_NONFRAG;
+
+ /* If IPv4 header has DF flag enabled and TSO support is
+ * disabled, partial chcecksum should not be calculated.
+ */
+ if (!tx_ring->adapter->tso4_supported)
+ continue;
+ }
+
+ if ((ol_flags & ENA_TX_OFFLOAD_NOTSUP_MASK) != 0 ||
+ (ol_flags & PKT_TX_L4_MASK) ==
+ PKT_TX_SCTP_CKSUM) {
+ rte_errno = -ENOTSUP;
+ return i;
+ }
+
+#ifdef RTE_LIBRTE_ETHDEV_DEBUG
+ ret = rte_validate_tx_offload(m);
+ if (ret != 0) {
+ rte_errno = ret;
+ return i;
+ }
+#endif
+
+ /* In case we are supposed to TSO and have DF not set (DF=0)
+ * hardware must be provided with partial checksum, otherwise
+ * it will take care of necessary calculations.
+ */
+
+ ret = rte_net_intel_cksum_flags_prepare(m,
+ ol_flags & ~PKT_TX_TCP_SEG);
+ if (ret != 0) {
+ rte_errno = ret;
+ return i;
+ }
+ }
+
+ return i;
+}
+