When the first packet is coming to datapath, the datapath does not know what to do, and its handover to userspace, and userspace program will insert the necessary actions along with the flow in the kernel path. Later, all subsequent packets taken care of the fast path, and the respective stats are updated in the datapath.
Now, assume that the packets are redirected to another path some time, not the datapath. In this case, the datapath entry for that respected flow will be deleted, if the flow is not reaches to datapath with in the expiry time. But in my scenario, the flow definitely passes again the datapath with in the expiry time. In this case, the datapath stats are not valid and needs update from user space before the packet reaches to datapath again, so that the stats are valid thereafter. Thanks, Ramana. On Fri, Jan 20, 2012 at 11:47 PM, Ben Pfaff <[email protected]> wrote: > What is a non-expiry flow? > > I don't understand the sentence that begins "This is possible." > > On Fri, Jan 20, 2012 at 09:36:46PM +0530, Ramana Reddy wrote: > > Hi Ben, > > Thanks for your reply. As you mentioned the datapath updates > > its own stats. But I need to update the stats for a given non-expiry > flow in > > the datapath from user space. > > > > This is possible, if the flow is deviated from the datapath certain time > > (less than > > the expiry time). > > > > Thanks, > > Ramana. > > > > > > On Fri, Jan 20, 2012 at 9:06 PM, Ben Pfaff <[email protected]> wrote: > > > > > On Fri, Jan 20, 2012 at 06:19:30PM +0530, Ramana Reddy wrote: > > > > How to update the datapath stats from user space in OVS-1.2.2. > > > > Is facet_update_stats in ofproto-dpif.c does this. > > > > If not what is the API from user space which is updating the > > > > stats. > > > > > > I don't really know what you're asking. A straightforward > > > interpretation is that the datapath updates its own stats. But that is > > > probably not what you are asking. Can you ask a more specific > question? > > > >
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