On your system, what is your iommu and intel_iommu kernel parameters? Could you try to use uio_pci_generic for both PF on host and VF in guest after configuring "iommu=pt" on your system?
> -----Original Message----- > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Andrew Theurer > Sent: Wednesday, June 10, 2015 5:48 AM > To: dev at dpdk.org > Subject: [dpdk-dev] Trouble with Tx on some i40 ports in KVM VM > > Hello. I am having some trouble with getting various dpdk applications to > work when using in a KVM VM. This happens > with the 2nd port on a dual port adapter. What I have configured: > > Haswell-ep host with KVM, 2 x i40e phys functions bound to vfio-pci, 2 > functions assigned to KVM guest. In the guest, the > i40 functions bound to uio_pci_generic, running testpmd with these options: > --nb-cores=2 --nb-ports=2 --portmask=3 > --interactive --auto-start. > > On another host directly connected to these adapters, I run pktgen on the 2 > i40e ports. If I Tx on port1, I get packets back > on port0. If I Tx on port0, no packets come back on port0. For some reason > Tx simply does not happen on that second > port. > > I have tried this test where there is no KVM, just using host, and it works > as expected. I have also tried this test with ixgbe > adapter in a KVM VM (I have both in same system), and it works as expected. > I have also tried just using a bridge in the VM > with i40e ports, with i40e module in use, and that also works as expected. > So, I don't think this has anything to do with the > adapters themselves, or cables, etc. Something is not working when using the > KVM VM, I just don't know what it is. > > Here is xstats from testpmd: > ###### NIC extended statistics for port 1 > rx_packets: 134615456 > tx_packets: 0 > rx_bytes: 8615389184 > tx_bytes: 0 > tx_errors: 0 > rx_missed_errors: 0 > rx_crc_errors: 0 > rx_bad_length_errors: 0 > rx_errors: 0 > alloc_rx_buff_failed: 0 > fdir_match: 0 > fdir_miss: 0 > tx_flow_control_xon: 0 > rx_flow_control_xon: 0 > tx_flow_control_xoff: 0 > rx_flow_control_xoff: 0 > rx_queue_0_rx_packets: 0 > rx_queue_0_rx_bytes: 0 > tx_queue_0_tx_packets: 0 > tx_queue_0_tx_bytes: 0 > tx_queue_0_tx_errors: 0 > > I can't find any evidence of errors anywhere. It's just not doing Tx at all > on that port. I have also tried using ptkgen in the > VM, to manually send packets on that port, and again, no packets sent, but no > errors either. > > Has anyone else tried 2 i40e ports in a KVM VM? Any ideas what could be > going on here? > > Thanks, > > -Andrew
