Played with it a little bit more. It can receive packets only if promiscuous mode is enabled in DPDK.
On Mon, Feb 22, 2016 at 11:00 PM, Clarylin L <clearasu at gmail.com> wrote: > I am working with DPDK 2.0. > > I guess it's not DPDK code issue , but more like an environment issue (as > same code has been working fine before. It's even working on another setup > now). Someone might have accidentally changed my setup, and I want to find > out what made dpdk-virtio stop working. > > Is DPDK-virtio dependent on any specific modules on the hypervisor? or are > there any configurations on the hypervisor that would impact the > functionality of virtio? or anything else I need to look into and check? > My VM is running on Ubuntu KVM. > > On Mon, Feb 22, 2016 at 7:50 PM, Yuanhan Liu <yuanhan.liu at linux.intel.com> > wrote: > >> On Mon, Feb 22, 2016 at 11:15:57AM -0800, Clarylin L wrote: >> > 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 >> >> That could be normal, when you don't bind the driver to igb_uio. >> >> > If someone can give any pointers that I should further look into, >> that'd be >> > very helpful. Appreciate your help! >> >> What's the last commit you are testing? And what are the steps >> to reproduce it? I have a quick try with vhost-switch example, >> with pkts injected by IXIA; it works fine here. >> >> Or better, mind do a git bisect? There aren't too many commits >> there. It should be a pretty fast bisect. >> >> --yliu >> > >