netdev - Re: [PATCH net-next 6/7] samples/bpf: xdp_redirect load XDP dummy prog on TX device

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Date:   Thu, 31 Aug 2017 13:08:22 +0300
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org
Cc:     John Fastabend <john.fastabend@...il.com>,
        Eran Ben Elisha <eranbe@...lanox.com>
Subject: Re: [PATCH net-next 6/7] samples/bpf: xdp_redirect load XDP dummy
 prog on TX device

Hi Jesper,

On 29/08/2017 5:38 PM, Jesper Dangaard Brouer wrote:
>   
> +/* Redirect require an XDP bpf_prog loaded on the TX device */
> +SEC("xdp_redirect_dummy")
> +int xdp_redirect_dummy(struct xdp_md *ctx)
> +{
> +	return XDP_PASS;
> +}
> +

I get a compilation error related to this:

$ make samples/bpf/

...
LLVM ERROR: 'xdp_redirect_dummy' label emitted multiple times to 
assembly file
make[1]: *** [samples/bpf/xdp_redirect_kern.o] Error 1
make: *** [samples/bpf/] Error 2


It can be fixed by the following patch.
I can submit it in a separate mail if you want to.


diff --git a/samples/bpf/xdp_redirect_kern.c 
b/samples/bpf/xdp_redirect_kern.c
index 1c90288d0203..8abb151e385f 100644
--- a/samples/bpf/xdp_redirect_kern.c
+++ b/samples/bpf/xdp_redirect_kern.c
@@ -82,7 +82,7 @@ int xdp_redirect_prog(struct xdp_md *ctx)

  /* Redirect require an XDP bpf_prog loaded on the TX device */
  SEC("xdp_redirect_dummy")
-int xdp_redirect_dummy(struct xdp_md *ctx)
+int xdp_redirect_dummy_prog(struct xdp_md *ctx)
  {
         return XDP_PASS;
  }
diff --git a/samples/bpf/xdp_redirect_map_kern.c 
b/samples/bpf/xdp_redirect_map_kern.c
index 79795d41ad0d..740a529ba84f 100644
--- a/samples/bpf/xdp_redirect_map_kern.c
+++ b/samples/bpf/xdp_redirect_map_kern.c
@@ -84,7 +84,7 @@ int xdp_redirect_map_prog(struct xdp_md *ctx)

  /* Redirect require an XDP bpf_prog loaded on the TX device */
  SEC("xdp_redirect_dummy")
-int xdp_redirect_dummy(struct xdp_md *ctx)
+int xdp_redirect_dummy_prog(struct xdp_md *ctx)
  {
         return XDP_PASS;
  }


Regards,
Tariq