[PATCH v3 11/16] net: support Nvgre in software packet type parser

[Olivier Matz <olivier.matz@6wind.com>]

Add support of Nvgre tunnels in rte_net_get_ptype(). At the same
time, as Nvgre transports Ethernet, we need to add the support for inner
Vlan, QinQ, and Mpls.

Signed-off-by: Jean Dao <jean.dao@6wind.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 lib/librte_mbuf/rte_mbuf_ptype.h |  7 +++++++
 lib/librte_net/rte_net.c         | 42 ++++++++++++++++++++++++++++++++++++++--
 lib/librte_net/rte_net.h         |  2 +-
 3 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/lib/librte_mbuf/rte_mbuf_ptype.h b/lib/librte_mbuf/rte_mbuf_ptype.h
index 6e62492..fbe764a 100644
--- a/lib/librte_mbuf/rte_mbuf_ptype.h
+++ b/lib/librte_mbuf/rte_mbuf_ptype.h
@@ -396,6 +396,13 @@ extern "C" {
  */
 #define RTE_PTYPE_INNER_L2_ETHER_VLAN       0x00020000
 /**
+ * QinQ packet type.
+ *
+ * Packet format:
+ * <'ether type'=[0x88A8]>
+ */
+#define RTE_PTYPE_INNER_L2_ETHER_QINQ       0x00030000
+/**
  * Mask of inner layer 2 packet types.
  */
 #define RTE_PTYPE_INNER_L2_MASK             0x000f0000
diff --git a/lib/librte_net/rte_net.c b/lib/librte_net/rte_net.c
index 66db2c8..53cfef8 100644
--- a/lib/librte_net/rte_net.c
+++ b/lib/librte_net/rte_net.c
@@ -183,7 +183,10 @@ ptype_tunnel(uint16_t *proto, const struct rte_mbuf *m,
 
 		*off += opt_len[flags];
 		*proto = gh->proto;
-		return RTE_PTYPE_TUNNEL_GRE;
+		if (*proto == rte_cpu_to_be_16(ETHER_TYPE_TEB))
+			return RTE_PTYPE_TUNNEL_NVGRE;
+		else
+			return RTE_PTYPE_TUNNEL_GRE;
 	}
 	case IPPROTO_IPIP:
 		*proto = rte_cpu_to_be_16(ETHER_TYPE_IPv4);
@@ -372,7 +375,42 @@ uint32_t rte_net_get_ptype(const struct rte_mbuf *m,
 	/* same job for inner header: we need to duplicate the code
 	 * because the packet types do not have the same value.
 	 */
-	hdr_lens->inner_l2_len = 0;
+	if (proto == rte_cpu_to_be_16(ETHER_TYPE_TEB)) {
+		eh = rte_pktmbuf_read(m, off, sizeof(*eh), &eh_copy);
+		if (unlikely(eh == NULL))
+			return pkt_type;
+		pkt_type |= RTE_PTYPE_INNER_L2_ETHER;
+		proto = eh->ether_type;
+		off += sizeof(*eh);
+		hdr_lens->inner_l2_len = sizeof(*eh);
+	}
+
+	if (proto == rte_cpu_to_be_16(ETHER_TYPE_VLAN)) {
+		const struct vlan_hdr *vh;
+		struct vlan_hdr vh_copy;
+
+		pkt_type &= ~RTE_PTYPE_INNER_L2_MASK;
+		pkt_type |= RTE_PTYPE_INNER_L2_ETHER_VLAN;
+		vh = rte_pktmbuf_read(m, off, sizeof(*vh), &vh_copy);
+		if (unlikely(vh == NULL))
+			return pkt_type;
+		off += sizeof(*vh);
+		hdr_lens->inner_l2_len += sizeof(*vh);
+		proto = vh->eth_proto;
+	} else if (proto == rte_cpu_to_be_16(ETHER_TYPE_QINQ)) {
+		const struct vlan_hdr *vh;
+		struct vlan_hdr vh_copy;
+
+		pkt_type &= ~RTE_PTYPE_INNER_L2_MASK;
+		pkt_type |= RTE_PTYPE_INNER_L2_ETHER_QINQ;
+		vh = rte_pktmbuf_read(m, off + sizeof(*vh), sizeof(*vh),
+			&vh_copy);
+		if (unlikely(vh == NULL))
+			return pkt_type;
+		off += 2 * sizeof(*vh);
+		hdr_lens->inner_l2_len += 2 * sizeof(*vh);
+		proto = vh->eth_proto;
+	}
 
 	if (proto == rte_cpu_to_be_16(ETHER_TYPE_IPv4)) {
 		const struct ipv4_hdr *ip4h;
diff --git a/lib/librte_net/rte_net.h b/lib/librte_net/rte_net.h
index 4a72b1b..02299db 100644
--- a/lib/librte_net/rte_net.h
+++ b/lib/librte_net/rte_net.h
@@ -68,7 +68,7 @@ struct rte_net_hdr_lens {
  *   L2: Ether, Vlan, QinQ
  *   L3: IPv4, IPv6
  *   L4: TCP, UDP, SCTP
- *   Tunnels: IPv4, IPv6, Gre
+ *   Tunnels: IPv4, IPv6, Gre, Nvgre
  *
  * @param m
  *   The packet mbuf to be parsed.
-- 
2.8.1