159. VF Jumboframe Tests

The support of jumbo frames by Poll Mode Drivers consists in enabling a port to receive Jumbo Frames with a configurable maximum packet length that is greater than the standard maximum Ethernet frame length (1518 bytes), up to a maximum value imposed by the hardware.

159.1. Prerequisites

  1. Create VF device from PF devices.:

    ./dpdk_nic_bind.py --st
    0000:87:00.0 'Ethernet Controller X710 for 10GbE SFP+' if=ens259f0 drv=i40e unused=
    0000:87:00.1 'Ethernet Controller X710 for 10GbE SFP+' if=ens259f1 drv=i40e unused=
    
    echo 1 > /sys/bus/pci/devices/0000\:87\:00.0/sriov_numvfs
    echo 1 > /sys/bus/pci/devices/0000\:87\:00.1/sriov_numvfs
    
    ./dpdk_nic_bind.py --st
    
    0000:87:00.0 'Ethernet Controller X710 for 10GbE SFP+' if=ens259f0 drv=i40e unused=
    0000:87:02.0 'XL710/X710 Virtual Function' unused=
    0000:87:0a.0 'XL710/X710 Virtual Function' unused=
    
  2. Detach VFs from the host, bind them to pci-stub driver:

    /sbin/modprobe pci-stub
    
    using `lspci -nn|grep -i ethernet` got VF device id, for example "8086 154c",
    
    echo "8086 154c" > /sys/bus/pci/drivers/pci-stub/new_id
    echo 0000:87:02.0 > /sys/bus/pci/devices/0000:87:02.0/driver/unbind
    echo 0000:87:02.0 > /sys/bus/pci/drivers/pci-stub/bind
    
    echo "8086 154c" > /sys/bus/pci/drivers/pci-stub/new_id
    echo 0000:87:0a.0 > /sys/bus/pci/devices/0000:87:0a.0/driver/unbind
    echo 0000:87:0a.0 > /sys/bus/pci/drivers/pci-stub/bind
    
  3. Passthrough VFs 87:02.0 & 87:02.1 to vm0 and start vm0:

    /usr/bin/qemu-system-x86_64  -name vm0 -enable-kvm \
    -cpu host -smp 4 -m 2048 -drive file=/home/image/sriov-fc20-1.img -vnc :1 \
    -device pci-assign,host=87:02.0,id=pt_0 \
    -device pci-assign,host=87:0a.0,id=pt_1
    
  4. Login vm0 and them bind VF devices to igb_uio driver:

    ./tools/dpdk_nic_bind.py --bind=igb_uio 00:04.0 00:05.0
    
  5. Start testpmd, set it in mac forward mode:

    testpmd -c 0x0f-- -i --portmask=0x1 \
      --tx-offloads=0x8fff --max-pkt-len=9000--port-topology=loop
    testpmd> set fwd mac
    testpmd> start
    

Start packet forwarding in the testpmd application with the start command. Then, make the Traffic Generator transmit to the target’s port packets of lengths (CRC included) 1517, 1518, 8999, and 9000 respectively. Check that the same amount of frames and bytes are received back by the Traffic Generator from its port connected to the target’s port.

Note: 8259x family VF device jumbo frame setting only take effect when VF rx mode jumbo frame is enable. VF device jumbo frame size setting shared with PF device and testpmd parameter max-pkt-len has no effect.

159.2. Functional Tests of Jumbo Frames

Testing the support of Jumbo Frames in Poll Mode Drivers consists in configuring the maximum packet length with a value greater than 1518, and in sending to the test machine packets with the following lengths (CRC included):

when driver is ixgbe, turn on the jumbo_frame switch:

sed -i -e 's/.jumbo_frame    = .*$/.jumbo_frame = 1,/g' app/test-pmd/testpmd.c
  1. packet length = 1518 - 1
  2. packet length = 1518
  3. packet length = 1518 + 1
  4. packet length = maximum packet length - 1
  5. packet length = maximum packet length
  6. packet length = maximum packet length + 1

159.3. Test Case: Normal frames with no jumbo frame support

Check that packets of standard lengths are still received with setting max-pkt-len.

159.4. Test Case: Normal frames with jumbo frame support

Check that packets of standard lengths are still received when enabling the receipt of Jumbo Frames.

159.5. Test Case: Jumbo frames with no jumbo frame support

Check that with jumbo frame support, packet lengths greater than the standard maximum frame (1518) can not received.

159.6. Test Case: Jumbo frames with jumbo frame support

Check that Jumbo Frames of lengths greater than the standard maximum frame (1518) and lower or equal to the maximum frame length can be received.

159.7. Test Case: Jumbo frames over jumbo frame support

Check that packets larger than the configured maximum packet length are effectively dropped by the hardware.