On Thu, Dec 01, 2016 at 10:27:12PM +0100, Hannes Frederic Sowa wrote: > like") and the problematic of parsing DNS packets in XDP due to string > processing and looping inside eBPF.
Hannes, Not too long ago you proposed a very interesting idea to add support for bounded loops without adding any new bpf instructions and changing llvm (which was way better than my 'rep' like instructions I was experimenting with). I thought systemtap guys also wanted bounded loops and you were cooperating on the design, so I gave up on my work and was expecting an imminent patch from you. I guess it sounds like you know believe that bounded loops are impossible or I misunderstand your statement ? As far as pattern search for DNS packets... it was requested by Cloudflare guys back in March: https://github.com/iovisor/bcc/issues/471 and it is useful for several tracing use cases as well. Unfortunately no one had time to implement it yet.
