[dpdk-dev] virtio still blindly take over virtio device managed by kernel

[Vincent Li <vincent.mc.li@gmail.com>]

Hi,

I am running the dpdk git repo which already had commit ac5e1d838dc
(virtio: skip error when probing kernel managed device), but in my
test, it seems still taking control of the kernel managed virtio
device and segmentation fault, here is the example:

# ./tools/dpdk_nic_bind.py --status

Network devices using DPDK-compatible driver
============================================
0000:00:07.0 'Virtio network device' drv=igb_uio unused=
0000:00:08.0 'Virtio network device' drv=igb_uio unused=

Network devices using kernel driver
===================================
0000:00:03.0 'Virtio network device' if= drv=virtio-pci unused=igb_uio

 #./x86_64-native-linuxapp-gcc/app/testpmd -c 0xf -n 4  -- -i
EAL: Detected 4 lcore(s)
EAL: Probing VFIO support...
EAL: WARNING: cpu flags constant_tsc=yes nonstop_tsc=no -> using
unreliable clock cycles !
EAL: PCI device 0000:00:03.0 on NUMA socket -1
EAL:   probe driver: 1af4:1000 rte_virtio_pmd
PMD: vtpci_init(): trying with legacy virtio pci.
Segmentation fault (core dumped)

if I blacklist 0000:00:03.0 from testpmd, testpmd works:

# ./x86_64-native-linuxapp-gcc/app/testpmd -c 0xf -n 4  -b 0000:00:03.0 -- -i
EAL: Detected 4 lcore(s)
EAL: Probing VFIO support...
EAL: WARNING: cpu flags constant_tsc=yes nonstop_tsc=no -> using
unreliable clock cycles !
EAL: PCI device 0000:00:03.0 on NUMA socket -1
EAL: PCI device 0000:00:07.0 on NUMA socket -1
EAL:   probe driver: 1af4:1000 rte_virtio_pmd
PMD: virtio_read_caps(): no modern virtio pci device found.
PMD: vtpci_init(): trying with legacy virtio pci.
EAL: PCI device 0000:00:08.0 on NUMA socket -1
EAL:   probe driver: 1af4:1000 rte_virtio_pmd
PMD: virtio_read_caps(): no modern virtio pci device found.
PMD: vtpci_init(): trying with legacy virtio pci.
Interactive-mode selected
Configuring Port 0 (socket 0)
rte_eth_dev_config_restore: port 0: MAC address array not supported
Port 0: 52:54:00:EA:6E:3E
Configuring Port 1 (socket 0)
rte_eth_dev_config_restore: port 1: MAC address array not supported
Port 1: 52:54:00:24:06:DB
Checking link statuses...
Port 0 Link Up - speed 10000 Mbps - full-duplex
Port 1 Link Up - speed 10000 Mbps - full-duplex
Done
testpmd>