[dpdk-dev] [PATCH v3 4/7] app/testpmd: introduce VXLAN GPE to csum forwarding engine

[Xueming Li]

This patch introduced VXLAN-GPE support to csum forwarding engine by
recognizing VXLAN-GPE UDP port and parsing tunnel payload according to
next-protocol type.

Signed-off-by: Xueming Li <xuemingl at mellanox.com>
---
 app/test-pmd/csumonly.c               | 96 +++++++++++++++++++++++++++++++++--
 app/test-pmd/parameters.c             | 12 ++++-
 app/test-pmd/testpmd.h                |  2 +
 doc/guides/testpmd_app_ug/run_app.rst |  5 ++
 4 files changed, 111 insertions(+), 4 deletions(-)

diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index 00ec40d58..526d28e74 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -56,6 +56,10 @@
 #define GRE_SUPPORTED_FIELDS	(GRE_CHECKSUM_PRESENT | GRE_KEY_PRESENT |\
 				 GRE_SEQUENCE_PRESENT)
 
+#define VXLAN_GPE_TYPE_IPv4 1
+#define VXLAN_GPE_TYPE_IPv6 2
+#define VXLAN_GPE_TYPE_ETH 3
+
 /* We cannot use rte_cpu_to_be_16() on a constant in a switch/case */
 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
@@ -63,6 +67,8 @@
 #define _htons(x) (x)
 #endif
 
+uint16_t vxlan_gpe_udp_port = 4790;
+
 /* structure that caches offload info for the current packet */
 struct testpmd_offload_info {
 	uint16_t ethertype;
@@ -87,6 +93,14 @@ struct simple_gre_hdr {
 	uint16_t proto;
 } __attribute__((__packed__));
 
+/* simplified VXLAN-GPE header */
+struct vxlan_gpe_hdr {
+	uint8_t vx_flags; /**< flag (8). */
+	uint8_t reserved[2]; /**< Reserved (16). */
+	uint8_t proto; /**< next-protocol (8). */
+	uint32_t vx_vni;   /**< VNI (24) + Reserved (8). */
+} __attribute__((__packed__));
+
 static uint16_t
 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
 {
@@ -197,6 +211,70 @@ parse_vxlan(struct udp_hdr *udp_hdr,
 	info->l2_len += ETHER_VXLAN_HLEN; /* add udp + vxlan */
 }
 
+/* Parse a vxlan-gpe header */
+static void
+parse_vxlan_gpe(struct udp_hdr *udp_hdr,
+	    struct testpmd_offload_info *info)
+{
+	struct ether_hdr *eth_hdr;
+	struct ipv4_hdr *ipv4_hdr;
+	struct ipv6_hdr *ipv6_hdr;
+	struct vxlan_gpe_hdr *vxlan_gpe_hdr;
+	uint8_t vxlan_gpe_len = sizeof(*vxlan_gpe_hdr);
+
+	/* check udp destination port, 4790 is the default vxlan-gpe port */
+	if (udp_hdr->dst_port != _htons(vxlan_gpe_udp_port))
+		return;
+
+	vxlan_gpe_hdr = (struct vxlan_gpe_hdr *)((char *)udp_hdr +
+				sizeof(struct udp_hdr));
+
+	if (!vxlan_gpe_hdr->proto || vxlan_gpe_hdr->proto ==
+	    VXLAN_GPE_TYPE_IPv4) {
+		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;
+
+		ipv4_hdr = (struct ipv4_hdr *)((char *)vxlan_gpe_hdr +
+			   vxlan_gpe_len);
+
+		parse_ipv4(ipv4_hdr, info);
+		info->ethertype = _htons(ETHER_TYPE_IPv4);
+		info->l2_len = 0;
+
+	} else if (vxlan_gpe_hdr->proto == VXLAN_GPE_TYPE_IPv6) {
+		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;
+
+		ipv6_hdr = (struct ipv6_hdr *)((char *)vxlan_gpe_hdr +
+			   vxlan_gpe_len);
+
+		info->ethertype = _htons(ETHER_TYPE_IPv6);
+		parse_ipv6(ipv6_hdr, info);
+		info->l2_len = 0;
+
+	} else if (vxlan_gpe_hdr->proto == VXLAN_GPE_TYPE_ETH) {
+		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;
+
+		eth_hdr = (struct ether_hdr *)((char *)vxlan_gpe_hdr +
+			  vxlan_gpe_len);
+
+		parse_ethernet(eth_hdr, info);
+	} else
+		return;
+
+	info->l2_len += ETHER_VXLAN_HLEN;
+}
+
 /* Parse a gre header */
 static void
 parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
@@ -591,6 +669,10 @@ pkt_copy_split(const struct rte_mbuf *pkt)
  *   Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
  *   Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
  *           UDP|TCP|SCTP
+ *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / Ether / IP|IP6 /
+ *           UDP|TCP|SCTP
+ *   Ether / (vlan) / outer IP|IP6 / outer UDP / VXLAN-GPE / IP|IP6 /
+ *           UDP|TCP|SCTP
  *   Ether / (vlan) / outer IP|IP6 / GRE / Ether / IP|IP6 / UDP|TCP|SCTP
  *   Ether / (vlan) / outer IP|IP6 / GRE / IP|IP6 / UDP|TCP|SCTP
  *   Ether / (vlan) / outer IP|IP6 / IP|IP6 / UDP|TCP|SCTP
@@ -694,10 +776,18 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 
 				udp_hdr = (struct udp_hdr *)((char *)l3_hdr +
 					info.l3_len);
-				parse_vxlan(udp_hdr, &info, m->packet_type);
-				if (info.is_tunnel)
-					tx_ol_flags |= (PKT_TX_TUNNEL_VXLAN |
+				parse_vxlan_gpe(udp_hdr, &info);
+				if (info.is_tunnel) {
+					tx_ol_flags |= (PKT_TX_TUNNEL_UNKNOWN |
 							PKT_TX_OUTER_UDP);
+				} else {
+					parse_vxlan(udp_hdr, &info,
+						    m->packet_type);
+					if (info.is_tunnel)
+						tx_ol_flags |=
+							(PKT_TX_TUNNEL_VXLAN |
+							 PKT_TX_OUTER_UDP);
+				}
 			} else if (info.l4_proto == IPPROTO_GRE) {
 				struct simple_gre_hdr *gre_hdr;
 
diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index 97d22b860..d7489bcec 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -70,7 +70,7 @@ usage(char* progname)
 	       "--rss-ip | --rss-udp | "
 	       "--rxpt= | --rxht= | --rxwt= | --rxfreet= | "
 	       "--txpt= | --txht= | --txwt= | --txfreet= | "
-	       "--txrst= | --tx-offloads ]\n",
+	       "--txrst= | --tx-offloads= | --vxlan-gpe-port= ]\n",
 	       progname);
 #ifdef RTE_LIBRTE_CMDLINE
 	printf("  --interactive: run in interactive mode.\n");
@@ -186,6 +186,7 @@ usage(char* progname)
 	printf("  --flow-isolate-all: "
 	       "requests flow API isolated mode on all ports at initialization time.\n");
 	printf("  --tx-offloads=0xXXXXXXXX: hexadecimal bitmask of TX queue offloads\n");
+	printf("  --vxlan-gpe-port=N: UPD port of tunnel VXLAN-GPE\n");
 }
 
 #ifdef RTE_LIBRTE_CMDLINE
@@ -621,6 +622,7 @@ launch_args_parse(int argc, char** argv)
 		{ "print-event",		1, 0, 0 },
 		{ "mask-event",			1, 0, 0 },
 		{ "tx-offloads",		1, 0, 0 },
+		{ "vxlan-gpe-port",		1, 0, 0 },
 		{ 0, 0, 0, 0 },
 	};
 
@@ -1092,6 +1094,14 @@ launch_args_parse(int argc, char** argv)
 					rte_exit(EXIT_FAILURE,
 						 "tx-offloads must be >= 0\n");
 			}
+			if (!strcmp(lgopts[opt_idx].name, "vxlan-gpe-port")) {
+				n = atoi(optarg);
+				if (n >= 0)
+					vxlan_gpe_udp_port = (uint16_t)n;
+				else
+					rte_exit(EXIT_FAILURE,
+						 "vxlan-gpe-port must be >= 0\n");
+			}
 			if (!strcmp(lgopts[opt_idx].name, "print-event"))
 				if (parse_event_printing_config(optarg, 1)) {
 					rte_exit(EXIT_FAILURE,
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 153abea05..4cec239fe 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -433,6 +433,8 @@ extern uint32_t retry_enabled;
 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 portid_t nb_peer_eth_addrs; /**< Number of peer ethernet addresses. */
 extern struct ether_addr peer_eth_addrs[RTE_MAX_ETHPORTS];
 
diff --git a/doc/guides/testpmd_app_ug/run_app.rst b/doc/guides/testpmd_app_ug/run_app.rst
index 1fd53958a..2e8690f41 100644
--- a/doc/guides/testpmd_app_ug/run_app.rst
+++ b/doc/guides/testpmd_app_ug/run_app.rst
@@ -479,3 +479,8 @@ The commandline options are:
 
     Set the hexadecimal bitmask of TX queue offloads.
     The default value is 0.
+
+*   ``--vxlan-gpe-port=N``
+
+    Set the UDP port number of tunnel VXLAN-GPE to N.
+    The default value is 4790.
-- 
2.13.3