I am running DPDK application (testpmd) within a VM based on virtio. With the same hypervisor and same DPDK code, it used to work well. But it stopped working since last week. The VM's port could not receive anything. I ran tcpdump on host's physical port, bridge interface as well as vnet interface, and did see packets coming in. However on VM's port there was nothing.
I ran gdb trying to debug, it hit function virtio_recv_mergeable_pkts(), but nb_used=VIRTQUEUE_NUSED(rxvq) always gave 0. I guess it's because the queue was empty. I enabled the PMD debug logging and the only thing that might be an issue was the following part. Other than this I could not see any thing that could indicate potential issues. Thu Feb 18 19:20:10 2016^@PMD: get_uio_dev(): Could not find uio resource Thu Feb 18 19:20:10 2016^@PMD: virtio_resource_init_by_ioports(): PCI Port IO found start=0xc040 with size=0x40 If someone can give any pointers that I should further look into, that'd be very helpful. Appreciate your help!
