[dpdk-dev] [PATCH v1 1/3] app/testpmd: add GENEVE parsing

[Ophir Munk <ophirmu@mellanox.com>]

GENEVE is a widely used tunneling protocol in modern Virtualized
Networks. testpmd already supports parsing of several tunneling
protocols including VXLAN, VXLAN-GPE, GRE. This commit adds GENEVE
parsing of inner protocols (IPv4-0x0800, IPv6-0x86dd, Ethernet-0x6558)
based on IETF draft-ietf-nvo3-geneve-09. GENEVE is considered more
flexible than the other protocols.  In terms of protocol format GENEVE
header has a variable length options as opposed to other tunneling
protocols which have a fixed header size.

Signed-off-by: Ophir Munk <ophirmu@mellanox.com>
---
 app/test-pmd/csumonly.c     | 70 ++++++++++++++++++++++++++++++++++++++++++-
 app/test-pmd/testpmd.h      |  1 +
 lib/librte_net/Makefile     |  2 +-
 lib/librte_net/meson.build  |  3 +-
 lib/librte_net/rte_geneve.h | 72 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 145 insertions(+), 3 deletions(-)
 create mode 100644 lib/librte_net/rte_geneve.h

diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index 0a96b24..5f29868 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -43,6 +43,7 @@
 #include <rte_flow.h>
 #include <rte_gro.h>
 #include <rte_gso.h>
+#include <rte_geneve.h>
 
 #include "testpmd.h"
 
@@ -63,6 +64,7 @@
 #endif
 
 uint16_t vxlan_gpe_udp_port = 4790;
+uint16_t geneve_udp_port = RTE_GENEVE_DEFAULT_PORT;
 
 /* structure that caches offload info for the current packet */
 struct testpmd_offload_info {
@@ -333,6 +335,64 @@ parse_vxlan_gpe(struct rte_udp_hdr *udp_hdr,
 	info->l2_len += RTE_ETHER_VXLAN_GPE_HLEN;
 }
 
+/* Fill in outer layers length */
+static void
+update_tunnel_outer(struct testpmd_offload_info *info)
+{
+	info->is_tunnel = 1;
+	info->outer_ethertype = info->ethertype;
+	info->outer_l2_len = info->l2_len;
+	info->outer_l3_len = info->l3_len;
+	info->outer_l4_proto = info->l4_proto;
+}
+
+/* Parse a geneve header */
+static void
+parse_geneve(struct rte_udp_hdr *udp_hdr,
+	    struct testpmd_offload_info *info)
+{
+	struct rte_ether_hdr *eth_hdr;
+	struct rte_ipv4_hdr *ipv4_hdr;
+	struct rte_ipv6_hdr *ipv6_hdr;
+	struct rte_geneve_hdr *geneve_hdr;
+	uint16_t geneve_len;
+
+	/* Check udp destination port. */
+	if (udp_hdr->dst_port != _htons(geneve_udp_port))
+		return;
+
+	geneve_hdr = (struct rte_geneve_hdr *)((char *)udp_hdr +
+				sizeof(struct rte_udp_hdr));
+	geneve_len = sizeof(struct rte_geneve_hdr) + geneve_hdr->opt_len * 4;
+	if (!geneve_hdr->proto || geneve_hdr->proto ==
+	    _htons(RTE_GENEVE_TYPE_IPV4)) {
+		update_tunnel_outer(info);
+		ipv4_hdr = (struct rte_ipv4_hdr *)((char *)geneve_hdr +
+			   geneve_len);
+		parse_ipv4(ipv4_hdr, info);
+		info->ethertype = _htons(RTE_ETHER_TYPE_IPV4);
+		info->l2_len = 0;
+	} else if (geneve_hdr->proto == _htons(RTE_GENEVE_TYPE_IPV6)) {
+		update_tunnel_outer(info);
+		ipv6_hdr = (struct rte_ipv6_hdr *)((char *)geneve_hdr +
+			   geneve_len);
+		info->ethertype = _htons(RTE_ETHER_TYPE_IPV6);
+		parse_ipv6(ipv6_hdr, info);
+		info->l2_len = 0;
+
+	} else if (geneve_hdr->proto == _htons(RTE_GENEVE_TYPE_ETH)) {
+		update_tunnel_outer(info);
+		eth_hdr = (struct rte_ether_hdr *)((char *)geneve_hdr +
+			  geneve_len);
+		parse_ethernet(eth_hdr, info);
+	} else
+		return;
+
+	info->l2_len +=
+		(sizeof(struct rte_udp_hdr) + sizeof(struct rte_geneve_hdr) +
+		((struct rte_geneve_hdr *)geneve_hdr)->opt_len * 4);
+}
+
 /* Parse a gre header */
 static void
 parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
@@ -873,9 +933,17 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 				}
 				parse_vxlan(udp_hdr, &info,
 					    m->packet_type);
-				if (info.is_tunnel)
+				if (info.is_tunnel) {
 					tx_ol_flags |=
 						PKT_TX_TUNNEL_VXLAN;
+					goto tunnel_update;
+				}
+				parse_geneve(udp_hdr, &info);
+				if (info.is_tunnel) {
+					tx_ol_flags |=
+						PKT_TX_TUNNEL_GENEVE;
+					goto tunnel_update;
+				}
 			} else if (info.l4_proto == IPPROTO_GRE) {
 				struct simple_gre_hdr *gre_hdr;
 
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 25a12b1..a60e009 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -456,6 +456,7 @@ extern struct fwd_lcore  **fwd_lcores;
 extern struct fwd_stream **fwd_streams;
 
 extern uint16_t vxlan_gpe_udp_port; /**< UDP port of tunnel VXLAN-GPE. */
+extern uint16_t geneve_udp_port; /**< UDP port of tunnel GENEVE. */
 
 extern portid_t nb_peer_eth_addrs; /**< Number of peer ethernet addresses. */
 extern struct rte_ether_addr peer_eth_addrs[RTE_MAX_ETHPORTS];
diff --git a/lib/librte_net/Makefile b/lib/librte_net/Makefile
index 9830e77..9fe99af 100644
--- a/lib/librte_net/Makefile
+++ b/lib/librte_net/Makefile
@@ -20,6 +20,6 @@ SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_sctp.h rte_icmp.h rte_arp.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_ether.h rte_gre.h rte_net.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_net_crc.h rte_mpls.h rte_higig.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_gtp.h rte_vxlan.h
-SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_ecpri.h
+SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_ecpri.h rte_geneve.h
 
 include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_net/meson.build b/lib/librte_net/meson.build
index 24ed825..52d3a97 100644
--- a/lib/librte_net/meson.build
+++ b/lib/librte_net/meson.build
@@ -16,7 +16,8 @@ headers = files('rte_ip.h',
 	'rte_net_crc.h',
 	'rte_mpls.h',
 	'rte_higig.h',
-	'rte_ecpri.h')
+	'rte_ecpri.h',
+	'rte_geneve.h')
 
 sources = files('rte_arp.c', 'rte_ether.c', 'rte_net.c', 'rte_net_crc.c')
 deps += ['mbuf']
diff --git a/lib/librte_net/rte_geneve.h b/lib/librte_net/rte_geneve.h
new file mode 100644
index 0000000..a1b69c7
--- /dev/null
+++ b/lib/librte_net/rte_geneve.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2020 Mellanox Technologies, Ltd
+ */
+
+#ifndef _RTE_GENEVE_H_
+#define _RTE_GENEVE_H_
+
+/**
+ * @file
+ *
+ * GENEVE-related definitions
+ */
+
+#include <stdint.h>
+
+#include <rte_udp.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** GENEVE default port. */
+#define RTE_GENEVE_DEFAULT_PORT 6081
+
+/**
+ * GENEVE protocol header. (draft-ietf-nvo3-geneve-09)
+ * Contains:
+ * 2-bits version (must be 0).
+ * 6-bits option length in four byte multiples, not including the eight
+ *	bytes of the fixed tunnel header.
+ * 1-bit control packet.
+ * 1-bit critical options in packet.
+ * 6-bits reserved
+ * 16-bits Protocol Type. The protol data unit after the Geneve header
+ *	following the EtherType convention. Ethernet itself is represented by
+ *	the value 0x6558.
+ * 24-bits Virtual Network Identifier (VNI). Virtual network unique identified.
+ * 8-bits reserved bits (must be 0 on transmission and ignored on reciept).
+ * More-bits (optinal) variable length options.
+ */
+__extension__
+struct rte_geneve_hdr {
+#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+	uint8_t ver:2;		/**< Version (2).  */
+	uint8_t opt_len:6;	/**< Options length (6). */
+	uint8_t oam:1;		/**< Control packet (1). */
+	uint8_t critical:1;	/**< Critical packet (1). */
+	uint8_t rsvd1:6;	/**< Reserved (6). */
+#else
+	uint8_t opt_len:6;	/**< Options length (6). */
+	uint8_t ver:2;		/**< Version (2).  */
+	uint8_t rsvd1:6;	/**< Reserved (6). */
+	uint8_t critical:1;	/**< Critical packet (1). */
+	uint8_t oam:1;		/**< Control packet (1). */
+#endif
+	rte_be16_t proto;	/**< Protocol type (16). */
+	uint8_t vni[3];		/**< Virtual network identifier (24). */
+	uint8_t rsvd2;		/**< Reserved (8). */
+	char	opts[0];	/**<Variable length options. */
+} __rte_packed;
+
+/* GENEVE next protocol types */
+#define RTE_GENEVE_TYPE_IPV4		0x0800 /**< IPv4 Protocol. */
+#define RTE_GENEVE_TYPE_IPV6		0x86dd /**< IPv6 Protocol. */
+#define RTE_GENEVE_TYPE_ETH		0x6558 /**< Ethernet Protocol. */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_GENEVE_H_ */
-- 
2.8.4