netdev - Re: Error running AF_XDP sample application

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Date:   Fri, 10 Aug 2018 11:58:47 +0200
From:   Konrad Djimeli <kdjimeli@...lia.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: Error running AF_XDP sample application

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