[PATCH 14/20] testpmd: support ipip tunnel in csum forward engine

[Olivier Matz <olivier.matz-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>]

Add support for IP over IP tunnels.

Signed-off-by: Olivier Matz <olivier.matz-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
---
 app/test-pmd/cmdline.c  |  2 +-
 app/test-pmd/csumonly.c | 40 ++++++++++++++++++++++++++++++++++------
 2 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index aa5c178..70ab126 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -323,7 +323,7 @@ static void cmd_help_long_parsed(void *parsed_result,
 			"    ip|udp|tcp|sctp always concern the inner layer.\n"
 			"    outer-ip concerns the outer IP layer in"
 			" case the packet is recognized as a tunnel packet by"
-			" the forward engine (vxlan and gre are supported)\n"
+			" the forward engine (vxlan, gre and ipip are supported)\n"
 			"    Please check the NIC datasheet for HW limits.\n\n"
 
 			"csum parse-tunnel (on|off) (tx_port_id)\n"
diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index 02c01f6..407e3b3 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -278,6 +278,35 @@ parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
 	info->l2_len += sizeof(struct simple_gre_hdr);
 }
 
+
+/* Parse an encapsulated ip or ipv6 header */
+static void
+parse_encap_ip(void *encap_ip, struct testpmd_offload_info *info)
+{
+	struct ipv4_hdr *ipv4_hdr = encap_ip;
+	struct ipv6_hdr *ipv6_hdr = encap_ip;
+	uint8_t ip_version;
+
+	ip_version = (ipv4_hdr->version_ihl & 0xf0) >> 4;
+
+	if (ip_version != 4 && ip_version != 6)
+		return;
+
+	info->is_tunnel = 1;
+	info->outer_ethertype = info->ethertype;
+	info->outer_l2_len = info->l2_len;
+	info->outer_l3_len = info->l3_len;
+
+	if (ip_version == 4) {
+		parse_ipv4(ipv4_hdr, info);
+		info->ethertype = _htons(ETHER_TYPE_IPv4);
+	} else {
+		parse_ipv6(ipv6_hdr, info);
+		info->ethertype = _htons(ETHER_TYPE_IPv6);
+	}
+	info->l2_len = 0;
+}
+
 /* modify the IPv4 or IPv4 source address of a packet */
 static void
 change_ip_addresses(void *l3_hdr, uint16_t ethertype)
@@ -430,6 +459,7 @@ uint16_t testpmd_ol_flags)
  *           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
  *
  * The testpmd command line for this forward engine sets the flags
  * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
@@ -511,14 +541,12 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
 				gre_hdr = (struct simple_gre_hdr *)
 					((char *)l3_hdr + info.l3_len);
 				parse_gre(gre_hdr, &info);
+			} else if (info.l4_proto == IPPROTO_IPIP) {
+				void *encap_ip_hdr;
+				encap_ip_hdr = (char *)l3_hdr + info.l3_len;
+				parse_encap_ip(encap_ip_hdr, &info);
 			}
 		}
-			info.l4_proto == IPPROTO_GRE) {
-			struct simple_gre_hdr *gre_hdr;
-			gre_hdr = (struct simple_gre_hdr *)((char *)l3_hdr +
-				info.l3_len);
-			parse_gre(gre_hdr, &info);
-		}
 
 		/* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
 		if (info.is_tunnel) {
-- 
2.1.4