From: Jiayu Hu <jiayu.hu@intel.com>
Date: Tue, 21 Nov 2017 06:56:52 +0000 (+0800)
Subject: vhost: support UDP Fragmentation Offload
X-Git-Tag: spdx-start~516
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=6d18505efaa6;p=dpdk.git

vhost: support UDP Fragmentation Offload

In virtio, UDP Fragmentation Offload (UFO) includes two parts: host UFO
and guest UFO. Guest UFO means the frontend can receive large UDP
packets, and host UFO means the backend can receive large UDP packets.
This patch supports host UFO and guest UFO for vhost-user.

Signed-off-by: Jiayu Hu <jiayu.hu@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Tested-by: Lei Yao <lei.a.yao@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Yuanhan Liu <yliu@fridaylinux.org>
---

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index e4e3917f64..6cba632b97 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -208,6 +208,13 @@ extern "C" {
 
 /* add new TX flags here */
 
+/**
+ * UDP Fragmentation Offload flag. This flag is used for enabling UDP
+ * fragmentation in SW or in HW. When use UFO, mbuf->tso_segsz is used
+ * to store the MSS of UDP fragments.
+ */
+#define PKT_TX_UDP_SEG	(1ULL << 42)
+
 /**
  * Request security offload processing on the TX packet.
  */
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 1943d069a1..8afb4265de 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -178,10 +178,12 @@ struct vhost_msg {
 				(1ULL << VIRTIO_NET_F_GSO) | \
 				(1ULL << VIRTIO_NET_F_HOST_TSO4) | \
 				(1ULL << VIRTIO_NET_F_HOST_TSO6) | \
+				(1ULL << VIRTIO_NET_F_HOST_UFO) | \
 				(1ULL << VIRTIO_NET_F_CSUM)    | \
 				(1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
 				(1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
 				(1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
+				(1ULL << VIRTIO_NET_F_GUEST_UFO) | \
 				(1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
 				(1ULL << VIRTIO_NET_F_MTU) | \
 				(1ULL << VIRTIO_F_IOMMU_PLATFORM))
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 4f7217f898..cd304f61b7 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -159,6 +159,11 @@ virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
 		net_hdr->gso_size = m_buf->tso_segsz;
 		net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
 					+ m_buf->l4_len;
+	} else if (m_buf->ol_flags & PKT_TX_UDP_SEG) {
+		net_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
+		net_hdr->gso_size = m_buf->tso_segsz;
+		net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len +
+			m_buf->l4_len;
 	} else {
 		ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
 		ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
@@ -792,6 +797,11 @@ vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
 			m->tso_segsz = hdr->gso_size;
 			m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
 			break;
+		case VIRTIO_NET_HDR_GSO_UDP:
+			m->ol_flags |= PKT_TX_UDP_SEG;
+			m->tso_segsz = hdr->gso_size;
+			m->l4_len = sizeof(struct udp_hdr);
+			break;
 		default:
 			RTE_LOG(WARNING, VHOST_DATA,
 				"unsupported gso type %u.\n", hdr->gso_type);