On Mon, 7 Oct, 2019, 11:03 PM Stephen Hemminger, <[email protected]> wrote:
> On Mon, 7 Oct 2019 22:37:43 +0530 > Jerin Jacob <[email protected]> wrote: > > > On Mon, 7 Oct, 2019, 10:23 PM Stephen Hemminger, < > [email protected]> > > wrote: > > > > > Simple classic BPF interpreter based off of libpcap. > > > > > > This is a copy of the BPF interpreter from libpcap which is > > > modified to handle mbuf meta data. The existing pcap_offline_filter > > > does not expose a way to match VLAN tags. Copying the BPF interpreter > > > also means that rte_pdump still does not have a hard dependency > > > on libpcap. > > > > > > > Why not use DPDK's librte_bpf library? Rather implementing cBPF > > interpreter. Currently it supports eBPF which is super set of cBPF.if is > > this features very specific to cBPF, we clould simply implement cBPF > using > > eBPF or implement a new cBPF program type. That scheme could leverage > > existing JIT infrastructure also. Using JIT will improve filtering > > performance. > > > > > > > > > > Because pcap library generates cBPF in its string to BPF compiler. > Translating cBPF to eBPF is non trivial. > Then at least cBPF interpreter should move to librte_bpf. We can hook to JIT if required in future.
