Does virtio-net PMD require specific QEMU virtio-net parameters?

Hi,

I cannot invoke virtio-net PMD at least on Ubuntu12 and Ubuntu14 QEMU guest. This behavior might be seen on other users environment also, so I report it. .
Here is error log.

$ ./testpmd -c f -n 1 -- -i

....snip....

Configuring Port0 (socket0)
Fail to configuring port 0 tx queues.
EAL: Error - exiting with code: 1
Cause: Start ports failed
$

As a result of bisect, it seems this behavior is caused by following patch.

61b16f0f167a331e65f0729b3554ded0440b545b
virtio: check for transmit checksum config error

After revert the patch, I haven't seen the error.

My question is that after applying this patch, should I specify some specific parameters for QEMU virtio-net device?
Here is my parameters of virtio-net.

-device
virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:00:c6:a7:44,bus=pci.0,addr=0x5 \
-netdev tap,id=hostnet1

Also could someone reproduce the same issue?
My host is ubuntu14, and I am using QEMU I've got using apt-get.

Thanks,
Tetsuya

Try to add '--txqflags 0xf00' into the testpmd cmd line:

$ ./testpmd -c f -n 1 -- -i --txqflags 0xf00

Thanks
Changchun

I appreciate your suggestion. I can invoke it correctly.

Thanks,
Tetsuya