+static void
+tap_verify_csum(struct rte_mbuf *mbuf)
+{
+ uint32_t l2 = mbuf->packet_type & RTE_PTYPE_L2_MASK;
+ uint32_t l3 = mbuf->packet_type & RTE_PTYPE_L3_MASK;
+ uint32_t l4 = mbuf->packet_type & RTE_PTYPE_L4_MASK;
+ unsigned int l2_len = sizeof(struct ether_hdr);
+ unsigned int l3_len;
+ uint16_t cksum = 0;
+ void *l3_hdr;
+ void *l4_hdr;
+
+ if (l2 == RTE_PTYPE_L2_ETHER_VLAN)
+ l2_len += 4;
+ else if (l2 == RTE_PTYPE_L2_ETHER_QINQ)
+ l2_len += 8;
+ /* Don't verify checksum for packets with discontinuous L2 header */
+ if (unlikely(l2_len + sizeof(struct ipv4_hdr) >
+ rte_pktmbuf_data_len(mbuf)))
+ return;
+ l3_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len);
+ if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
+ struct ipv4_hdr *iph = l3_hdr;
+
+ /* ihl contains the number of 4-byte words in the header */
+ l3_len = 4 * (iph->version_ihl & 0xf);
+ if (unlikely(l2_len + l3_len > rte_pktmbuf_data_len(mbuf)))
+ return;
+
+ cksum = ~rte_raw_cksum(iph, l3_len);
+ mbuf->ol_flags |= cksum ?
+ PKT_RX_IP_CKSUM_BAD :
+ PKT_RX_IP_CKSUM_GOOD;
+ } else if (l3 == RTE_PTYPE_L3_IPV6) {
+ l3_len = sizeof(struct ipv6_hdr);
+ } else {
+ /* IPv6 extensions are not supported */
+ return;
+ }
+ if (l4 == RTE_PTYPE_L4_UDP || l4 == RTE_PTYPE_L4_TCP) {
+ l4_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len + l3_len);
+ /* Don't verify checksum for multi-segment packets. */
+ if (mbuf->nb_segs > 1)
+ return;
+ if (l3 == RTE_PTYPE_L3_IPV4)
+ cksum = ~rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
+ else if (l3 == RTE_PTYPE_L3_IPV6)
+ cksum = ~rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
+ mbuf->ol_flags |= cksum ?
+ PKT_RX_L4_CKSUM_BAD :
+ PKT_RX_L4_CKSUM_GOOD;
+ }
+}
+
+static uint64_t
+tap_rx_offload_get_port_capa(void)
+{
+ /*
+ * In order to support legacy apps,
+ * report capabilities also as port capabilities.
+ */
+ return DEV_RX_OFFLOAD_SCATTER |
+ DEV_RX_OFFLOAD_IPV4_CKSUM |
+ DEV_RX_OFFLOAD_UDP_CKSUM |
+ DEV_RX_OFFLOAD_TCP_CKSUM;
+}
+
+static uint64_t
+tap_rx_offload_get_queue_capa(void)
+{
+ return DEV_RX_OFFLOAD_SCATTER |
+ DEV_RX_OFFLOAD_IPV4_CKSUM |
+ DEV_RX_OFFLOAD_UDP_CKSUM |
+ DEV_RX_OFFLOAD_TCP_CKSUM;
+}
+
+static bool
+tap_rxq_are_offloads_valid(struct rte_eth_dev *dev, uint64_t offloads)
+{
+ uint64_t port_offloads = dev->data->dev_conf.rxmode.offloads;
+ uint64_t queue_supp_offloads = tap_rx_offload_get_queue_capa();
+ uint64_t port_supp_offloads = tap_rx_offload_get_port_capa();
+
+ if ((offloads & (queue_supp_offloads | port_supp_offloads)) !=
+ offloads)
+ return false;
+ if ((port_offloads ^ offloads) & port_supp_offloads)
+ return false;
+ return true;
+}
+