On Thu, Jun 13, 2013 at 1:58 PM, jinho hwang <hwang.ji...@gmail.com> wrote:
> > On Thu, Jun 13, 2013 at 1:26 PM, Ben Pfaff <b...@nicira.com> wrote: > >> On Thu, Jun 13, 2013 at 01:17:39PM -0400, jinho hwang wrote: >> > On Thu, Jun 13, 2013 at 12:16 PM, Ben Pfaff <b...@nicira.com> wrote: >> > >> > > On Thu, Jun 13, 2013 at 10:37:49AM -0400, jinho hwang wrote: >> > > > I am new to ovs. I am trying to set up userspace switch using >> > > > INSTALL.userspace. There are many commands to add bridge and >> interfaces >> > > > using ovs-vsctl, but ovs-vsctl does not return (infinite loop). How >> do I >> > > > have to run these commands? Just ctrl-c is ok? I may not have a good >> > > > understanding of the system yet. If you can refer me to any good >> > > > documentation related to this, it would be appreciated as well. >> > > >> > > Is ovs-vswitchd running? >> > > >> > >> > Thanks, Ben. >> > >> > I have figured out how the system works now. I thought ovs-vsctl does >> not >> > return to the user, but it was controlled by ovs-vswtichd that signals >> to >> > close. Like you said, my fault was that I did not run ovs-vswitchd >> > properly. >> > >> > A couple of more questions if you can provide some more information: >> > >> > 1. Logging: >> > ovs-aptctl shows all INFO in file column, but I can not find any file >> > logging messages. Not in /var/log and in /usr/local/var/log/ >> > Is there any global knob I should control? >> >> Use --log-file, see the manpage for details. >> >> > 2. Userspace datapath: >> > - Does this mean netdev is used by datapath? >> >> Yes. >> >> > - If so, how can I query stat information of datapath? Is there even >> one to >> > query? I want to see something like "ovs-dpctl show br0", if there is >> one. >> >> You can use "ovs-appctl dpif/show". >> >> > - What are the limitations if I use userspace datapath? I know >> performance >> > can not be good, and some functionalities (tunneling) may not work. >> Right? >> >> Yes. >> > > Thanks again, Ben. > > Sorry to bother you, but I have follow-up questions: > > 1. Can you interpret these messages? > 2013-06-13T17:52:20Z|00144|*dpif_netdev*|ERR|error receiving data from > em1: Message too long > 2013-06-13T17:52:27Z|00145|netdev|INFO|Dropped 1214 log messages in last > 12 seconds (most recently, 0 seconds ago) due to excessive rate > 2013-06-13T17:52:27Z|00146|netdev|INFO|--------trace: > lib/netdev.c-netdev_recv(419) > > - Why is dpif_netdev called? > -> It turns out that dpif_netdev is the datapath routine that calls netdev.c for data. I can confirm that bridge.c makes this happens to make netdev class for "netdev" in a dummy fashion. - Is it a part of userspace netdev? > > -> Yes, > > 2. I am not very clear on where I receive packets and route them where? I > am trying to read code now, but I am not very sure. > > - Can you pin point where netdev receives packets and forward them to > where? > -> It comes to the netdev_recv function to call device-specific read, and in dpif_netdev_run function, a received packet goes to dp_netdev_port_input for routing. Then, depending on dp_netdev_lookup_flow result, the packet is switched to another place(dp_netdev_execute_actions) or to userspace as an upcall which hangs to dp->queues structure. > - Also, Do flows in the table not call upcall? Or all the traffic go to > the ovs-switchd? > -> Clarified above. > > Thank you, > > Jinho > Self answered. Please correct me if I am wrong. Thanks for the help! - Jinho
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