cc'ing iovisor/bcc dev alias Jakub, I think this (bpf prog/map introspection) is a great idea. I am cc'ing iovisor/bcc alias so maybe similar functionality can be implemented in bcc as well. Thanks, Yonghong On Sat, Jul 22, 2017 at 12:20 AM, Jakub Kicinski <kubakici@xxxxx> wrote: > On Fri, 21 Jul 2017 15:37:43 -0700, Jakub Kicinski wrote: >> On Fri, 21 Jul 2017 12:22:14 +0200, Daniel Borkmann wrote: >> > Hi Jakub, >> > >> > On 07/21/2017 07:53 AM, Jakub Kicinski wrote: >> > > I think it's recommended to use bpffs, are there any tools for >> > > interacting with it? >> > >> > Only to name a few examples, cilium and the iproute2's BPF ELF >> > loader interact with it, and I think recently also bcc got support >> > for bpffs. From library side kernel's libbpf supports pinning into >> > bpffs as well. We could probably have a small tool utilizing libbpf >> > that sits under kernel tools/, though. >> >> Upon further reflection it dawned on me that I should probably build on >> top of Martin's work and utilize the prog/map ids. Martin, do you have >> any code (or plans to produce code :)) for listing/interrogating/ >> prodding programs and maps via the new ABI? > > I put together this very simple tool with iproute2-like syntax: > > https://github.com/Netronome/bpf-tool > > These are available subcommands: > > bpf prog show > > bpf map show > bpf map dump id MAP_ID > bpf map update id MAP_ID key BYTES value BYTES > bpf map lookup id MAP_ID key BYTES > bpf map delete id MAP_ID key BYTES > > The plan is to add support for substituting "id MAP_ID" with "pinned > PATH". > > I probably have a need to poke maps more randomly than people would > usually do, but I certainly enjoy the freedom of being able to load the > xdp kernel samples with iproute2 and then observe the values from CLI :) > > I wonder what others think. Or maybe someone else has a similar tool, > but just haven't responded yet? > > One thing which is not clear to me is how to get the association > between programs and maps? Would we need to extend > BPF_OBJ_GET_INFO_BY_FD to provide this info?
|