+ VHOST_LOG_DATA(WARNING, "(%s) unsupported gso type %u.\n",
+ dev->ifname, hdr->gso_type);
+ goto error;
+ }
+ }
+ return;
+
+error:
+ m->l2_len = 0;
+ m->l3_len = 0;
+ m->ol_flags = 0;
+}
+
+static __rte_always_inline void
+vhost_dequeue_offload(struct virtio_net *dev, struct virtio_net_hdr *hdr,
+ struct rte_mbuf *m, bool legacy_ol_flags)
+{
+ struct rte_net_hdr_lens hdr_lens;
+ int l4_supported = 0;
+ uint32_t ptype;
+
+ if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
+ return;
+
+ if (legacy_ol_flags) {
+ vhost_dequeue_offload_legacy(dev, hdr, m);
+ return;
+ }
+
+ m->ol_flags |= RTE_MBUF_F_RX_IP_CKSUM_UNKNOWN;
+
+ ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
+ m->packet_type = ptype;
+ if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
+ (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
+ (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
+ l4_supported = 1;
+
+ /* According to Virtio 1.1 spec, the device only needs to look at
+ * VIRTIO_NET_HDR_F_NEEDS_CSUM in the packet transmission path.
+ * This differs from the processing incoming packets path where the
+ * driver could rely on VIRTIO_NET_HDR_F_DATA_VALID flag set by the
+ * device.
+ *
+ * 5.1.6.2.1 Driver Requirements: Packet Transmission
+ * The driver MUST NOT set the VIRTIO_NET_HDR_F_DATA_VALID and
+ * VIRTIO_NET_HDR_F_RSC_INFO bits in flags.
+ *
+ * 5.1.6.2.2 Device Requirements: Packet Transmission
+ * The device MUST ignore flag bits that it does not recognize.
+ */
+ if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
+ uint32_t hdrlen;
+
+ hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
+ if (hdr->csum_start <= hdrlen && l4_supported != 0) {
+ m->ol_flags |= RTE_MBUF_F_RX_L4_CKSUM_NONE;
+ } else {
+ /* Unknown proto or tunnel, do sw cksum. We can assume
+ * the cksum field is in the first segment since the
+ * buffers we provided to the host are large enough.
+ * In case of SCTP, this will be wrong since it's a CRC
+ * but there's nothing we can do.
+ */
+ uint16_t csum = 0, off;
+
+ if (rte_raw_cksum_mbuf(m, hdr->csum_start,
+ rte_pktmbuf_pkt_len(m) - hdr->csum_start, &csum) < 0)
+ return;
+ if (likely(csum != 0xffff))
+ csum = ~csum;
+ off = hdr->csum_offset + hdr->csum_start;
+ if (rte_pktmbuf_data_len(m) >= off + 1)
+ *rte_pktmbuf_mtod_offset(m, uint16_t *, off) = csum;
+ }
+ }
+
+ if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+ if (hdr->gso_size == 0)
+ return;
+
+ switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+ case VIRTIO_NET_HDR_GSO_TCPV4:
+ case VIRTIO_NET_HDR_GSO_TCPV6:
+ if ((ptype & RTE_PTYPE_L4_MASK) != RTE_PTYPE_L4_TCP)
+ break;
+ m->ol_flags |= RTE_MBUF_F_RX_LRO | RTE_MBUF_F_RX_L4_CKSUM_NONE;
+ m->tso_segsz = hdr->gso_size;
+ break;
+ case VIRTIO_NET_HDR_GSO_UDP:
+ if ((ptype & RTE_PTYPE_L4_MASK) != RTE_PTYPE_L4_UDP)
+ break;
+ m->ol_flags |= RTE_MBUF_F_RX_LRO | RTE_MBUF_F_RX_L4_CKSUM_NONE;
+ m->tso_segsz = hdr->gso_size;
+ break;
+ default: