To the same OVS bridge which uses Userspace datapath. Let’s see an example: ssh from instance A to instance B, where A and B connect The phenomenon of this problem is that instancesĬonnected with OVS could not establish TCP connection, while 元 (e.g ping) Support TX offloading, but according to my tests, at least OVS 2.3~2.7 Userspaceĭatapath does not support. I’m not sure if all userspace datapath implementations do not Tricky is that OVS doesn’t complaining or report any errors in log for thisĬonfiguration. TX Offloading with Userspace DatapathĪ problem occurs when TX offloading is enabled while OVS bridge uses Userspaceĭatapath: Userspace Datapath does not support TX offloading. Instance, and this is handled by the kernel module openvswitch.ko. Utilize physical NICs for checksum calculating for each packet sent out from When TX offload is enabled on instance’s tap devices (default setting), OVS will Hi Dave, Assuming that you are not using vector functions but the default xmit function with offload enabled, are you computing the pseudo-header checksum? Also no need to setup PTYPE for TX.Fig.1.1 is a deployment graph, OVS manages both physical ports (NICs) and Hi Dave, Assuming that you are not using vector functions but theĭefault xmit function with offload enabled, are youĬomputing the pseudo-header checksum? Also no need to setup PTYPE for TX. across multiple trials wireshark reports a constant Simplest case: 14-byte ethernet headers w/ type 0x800,Ģ0-byte ipv4 headers, TCP (SYN,ACK) packet with some Struct rte_mbuf setup, I add the following: ![]() Trying to convince an Intel Fortville (i40e) PMD / NIC toĬompute and insert TCP correct TCP checksums. Hi Dave, Assuming that you are not using vector functions but the default xmit function with offload enabled, are you computing the pseudo-header checksum? Also no need to setup PTYPE for TX. Independent of port numbers / across multiple trials wireshark reports a constant checksum error of 0xe31.Ībs(received checksum - computed checksum) = 0xe31. The packets involved are the simplest case: 14-byte ethernet headers w/ type 0x800, 20-byte ipv4 headers, TCP (SYN,ACK) packet with some options. The inbound tcp->checksum is known to be zero. ![]() Mb->ol_flags = PKT_TX_TCP_CKSUM | PKT_TX_IPV4 RTE_PTYPE_L2_ETHER | RTE_PTYPE_INNER_元_IPV4 | RTE_PTYPE_INNER_L4_TCP If (b->flags & VLIB_BUFFER_TCP_CHECKSUM_OFFLOAD) In addition to the typical struct rte_mbuf setup, I add the following: I’m having a hard time trying to convince an Intel Fortville (i40e) PMD / NIC to compute and insert TCP correct TCP checksums. Xmit function with offload enabled, are you computing the Multiple trials wireshark reports a constant checksum errorĪssuming that you are not using vector functions but the default ![]() Headers, TCP (SYN,ACK) packet with some options. RTE_PTYPE_INNER_元_IPV4 | RTE_PTYPE_INNER_L4_TCP Ĭase: 14-byte ethernet headers w/ type 0x800, 20-byte ipv4 Convince an Intel Fortville (i40e) PMD / NIC to compute and
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