netdev - Re: Error running AF_XDP sample application

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Date:   Fri, 10 Aug 2018 17:45:00 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     kdjimeli@...lia.com
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Netdev <netdev@...r.kernel.org>, netdev-owner@...r.kernel.org
Subject: Re: Error running AF_XDP sample application

Den fre 10 aug. 2018 kl 15:23 skrev Konrad Djimeli <kdjimeli@...lia.com>:
>
> On 2018-08-10 11:58, Konrad Djimeli wrote:
> > On 2018-08-10 03:51, Jakub Kicinski wrote:
> >> On Thu, 09 Aug 2018 18:18:08 +0200, kdjimeli wrote:
> >>> Hello,
> >>>
> >>> I have been trying to test a sample AF_XDP program, but I have been
> >>> experiencing some issues.
> >>> After building the sample code
> >>> https://github.com/torvalds/linux/tree/master/samples/bpf,
> >>> when running the xdpsock binary, I get the errors
> >>> "libbpf: failed to create map (name: 'xsks_map'): Invalid argument"
> >>> "libbpf: failed to load object './xdpsock_kern.o"
> >>>
> >>> I tried to figure out the cause of the error but all I know is that it
> >>> occurs at line 910 with the function
> >>> call "bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd)".
> >>>
> >>> Please I would like to inquire what could be a possible for this error.
> >>
> >> which kernel version are you running?
> >
> > My kernel version is 4.18.0-rc8+. I cloned it from
> > https://github.com/torvalds/linux before building a running.
> >
> > My commit head(git show-ref --head) is at
> > 1236568ee3cbb0d3ac62d0074a29b97ecf34cbbc HEAD
> > 1236568ee3cbb0d3ac62d0074a29b97ecf34cbbc refs/heads/master
> > 1236568ee3cbb0d3ac62d0074a29b97ecf34cbbc refs/remotes/origin/HEAD
> > 1236568ee3cbb0d3ac62d0074a29b97ecf34cbbc refs/remotes/origin/master
> > ...
> >
> >
> > I also applied the patch https://patchwork.ozlabs.org/patch/949884/
> > (samples: bpf: convert xdpsock_user.c to libbpf ), as the error was
> > initially in the form show below:
> >   "failed to create a map: 22 Invalid argument"
> >   "ERROR: load_bpf_file"
> >
> > Thanks
> > Konrad
>
> Also other sample applications that make use of other bpf maps, such as
> BPF_MAP_TYPE_CPUMAP in xdp_redirect_cpu work fine. But the application
> with BPF_MAP_TYPE_XSKMAP fails producing the error mentioned above.
>
> Thanks
> Konrad

Thanks for taking AF_XDP for a spin!

Before I start digging into details; Do you have CONFIG_XDP_SOCKETS=y
in your config? :-)


Björn