81. Generic Routing Encapsulation (GRE) Tests¶
Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol network. Intel® Ethernet 700 Series support GRE packet detecting, checksum computing and filtering.
81.1. Prerequisites¶
Intel® Ethernet 700 Series/ Intel® Ethernet Network Adapter X710-T4L/ Intel® Ethernet Network Adapter X710-T2L/ Intel® Ethernet 800 Series nic should be on the DUT.
81.2. Test Case 1: GRE ipv4 packet detect¶
Start testpmd and enable rxonly forwarding mode:
./<build_target>/app/dpdk-testpmd -c ffff -n 4 -- -i
testpmd> set fwd rxonly
testpmd> set verbose 1
testpmd> start
Send packet as table listed and packet type match each layer.
| Outer Vlan | Outer IP | Tunnel | Inner L3 | Inner L4 |
| No | Ipv4 | GRE | Ipv4 | Udp |
| No | Ipv4 | GRE | Ipv4 | Tcp |
| No | Ipv4 | GRE | Ipv4 | Sctp |
| Yes | Ipv4 | GRE | Ipv4 | Udp |
| Yes | Ipv4 | GRE | Ipv4 | Tcp |
| Yes | Ipv4 | GRE | Ipv4 | Sctp |
81.3. Test Case 2: GRE ipv6 packet detect¶
Start testpmd and enable rxonly forwarding mode:
./<build_target>/app/dpdk-testpmd -c ffff -n 4 -- -i --enable-hw-vlan
testpmd> set fwd rxonly
testpmd> set verbose 1
testpmd> start
Due to the kernel enables Qinq and cannot be closed, the DPDK only add `extend on` to make the VLAN filter
work normally. Therefore, if the i40e firmware version >= 8.4 the DPDK can only add `extend on` to make the VLAN filter work normally:
testpmd> vlan set extend on 0
Send packet as table listed and packet type match each layer:
Ether()/IPv6(nh=47)/GRE()/IP()/UDP()/Raw('x'*40)
Ether()/IPv6(nh=47)/GRE(proto=0x86dd)/IPv6()/UDP()/Raw('x'*40)
| Outer Vlan | Outer IP | Tunnel | Inner L3 | Inner L4 |
| No | Ipv6 | GRE | Ipv4 | Udp |
| No | Ipv6 | GRE | Ipv4 | Tcp |
| No | Ipv6 | GRE | Ipv4 | Sctp |
| Yes | Ipv6 | GRE | Ipv4 | Udp |
| Yes | Ipv6 | GRE | Ipv4 | Tcp |
| Yes | Ipv6 | GRE | Ipv4 | Sctp |
| Outer Vlan | Outer IP | Tunnel | Inner L3 | Inner L4 |
| No | Ipv6 | GRE | Ipv6 | Udp |
| No | Ipv6 | GRE | Ipv6 | Tcp |
| No | Ipv6 | GRE | Ipv6 | Sctp |
| Yes | Ipv6 | GRE | Ipv6 | Udp |
| Yes | Ipv6 | GRE | Ipv6 | Tcp |
| Yes | Ipv6 | GRE | Ipv6 | Sctp |
81.4. Test Case 4: GRE packet chksum offload¶
Start testpmd with hardware checksum offload enabled:
./<build_target>/app/dpdk-testpmd -c ff -n 3 -- -i --enable-rx-cksum --port-topology=loop
testpmd> set verbose 1
testpmd> set fwd csum
testpmd> csum set ip hw 0
testpmd> csum set udp hw 0
testpmd> csum set sctp hw 0
testpmd> csum set outer-ip hw 0
testpmd> csum set tcp hw 0
testpmd> csum parse-tunnel on 0
testpmd> start
Send packet with wrong outer IP checksum and check forwarded packet IP checksum is correct:
Ether()/IP(chksum=0x0)/GRE()/IP()/TCP()
Send packet with wrong inner IP checksum and check forwarded packet IP checksum is correct:
Ether()/IP()/GRE()/IP(chksum=0x0)/TCP()
Send packet with wrong inner TCP checksum and check forwarded packet TCP checksum is correct:
Ether()/IP()/GRE()/IP()/TCP(chksum=0x0)
Send packet with wrong inner UDP checksum and check forwarded packet UDP checksum is correct:
Ether()/IP()/GRE()/IP()/UDP(chksum=0xffff)
Send packet with wrong inner SCTP checksum and check forwarded packet SCTP checksum is correct:
Ether()/IP()/GRE()/IP()/SCTP(chksum=0x0)