Hi Ben, Justin, Jesse and All, Hope everyone doing great.
During my work, I create a socket using AF_PACKET with virtio_net_hdr and filled all the fields in the virtio_net_hdr and the flag to VIRTIO_NET_GSO_TCPV4 to enable TSO using af_packet. vnet->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; The code is not working when I am trying to send large packets over OVS VXLAN tunnel. It's dropping the large packets and the application is resending the MTU sized packets. The code is working fine in non ovs case (directly sending without ovs). I understood that UDP tunneling offloading (VXLAN) not happening because of nic may not support this offloading feature, but when I send iperf (AF_INET) traffic, though the offloading is not happening, but the large packets are fragmented and the VXLAN tunneling sending the fragmented packets. Why are we seeing this different behavior? What is the expected behavior in AF_PACKET in OVS? Does OVS support AF_PACKET offloading mechanism? If not, how we can avoid the retransmission of the packets. What are things to be done so that the kernel fragments large packets and send them out without dropping ( in case if offloading feature not available)? Looking forward to your reply. Regards, Ramana
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