Hi Ramana, I'm trying to understand your setup.
On Wed, Aug 28, 2019 at 4:11 AM Ramana Reddy <[email protected]> wrote: > > 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). Do you create AF_PACKET and bind its socket to OVS's vxlan device, ex: vxlan_sys_4789? In the non-ovs working case, do you bind AF_PACKET to the vxlan device created by using ip link command? > > 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? OVS's vxlan device is a light-weight tunnel device, so it might not have all the features. > > What is the expected behavior in AF_PACKET in OVS? Does OVS support > AF_PACKET offloading mechanism? AF_PACKET (see net/packet/af_packet.c) just from userspace send packet into kernel and to the device you bind to. It creates skb and invokes the device's xmit function. William > 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 > _______________________________________________ > dev mailing list > [email protected] > https://mail.openvswitch.org/mailman/listinfo/ovs-dev _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
