Hi, We are trying to bring up KVM based VMs on HP Gen10 Servers running on RHEL 7.6 and having Intel X710 NIC's.
The VMs are also running on RHEL 7.6 and the DPDK version used in the guest application is 18.08. Intel DPDK VF drivers (igb_uio) compiled and loaded currently in our VM are not compatible with the Host PF drivers(vfio-pci) for Intel X710 Ethernet NICs. The igb_uio driver may be only compatible with Intel NICs like 82599 as it worked in our lab for HP Gen9 servers running RHEL 7.6 having Intel 82599 NICs. Issues observed with DPDK VF driver igb_uio for Intel X710 NICs: The outgoing packets from DPDK application are leaving VM via VF towards Host’s Physical ports and reaching remote Host’s Physical ports. But the incoming packets from Host’s Physical port are not reaching VM via VF. Could you please confirm whether igb_uio driver is compatible with only Intel NICs like 82599 ? So we had to change PCI device binding to another driver vfio-pci available in RHEL7. But based on the debugging of our DPDK based application with VF driver vfio-pci on X710 NICs we observed that the incoming packets are VLAN stripped by HW when the OFFLOAD flags are not set for the same. why does X710 NIC VF driver remove the VLAN without RX offload VLAN strip flags set? Could you please check and confirm if the unexpected VLAN removal behaviour of X710 NIC VF driver vfio-pci is a known bug? We want to generalize DPDK implementation for all HW NICs.Could you please clarify if this is achievable with igb_uio or vfio-pci driver ? We would appreciate if you could provide your feedback and suggestions towards generic solution. Thanks, Suchetha
