Hi, There is another similar tool to dump maps data in Golang: https://github.com/cilium/bpf-map
But it works only via bpffs and not yet with map ids. And for code interacting with bpffs, there is also the gobpf library: https://github.com/iovisor/gobpf/pull/49/files Cheers, Alban On Sun, Jul 23, 2017 at 7:35 AM, Y Song via iovisor-dev < [email protected]> wrote: > 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 <[email protected]> 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? > _______________________________________________ > iovisor-dev mailing list > [email protected] > https://lists.iovisor.org/mailman/listinfo/iovisor-dev >
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