Re: [PATCH bpf-next] samples/bpf: xdp_redirect_cpu: Add mprog-disable to optstring.

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

On Sat, Jul 31, 2021 at 06:26:32AM IST, Matthew Cover wrote:
> Commit ce4dade7f12a ("samples/bpf: xdp_redirect_cpu: Load a eBPF program
> on cpumap") added the following option, but missed adding it to optstring:
> - mprog-disable: disable loading XDP program on cpumap entries
>
> Add the missing option character.
>

I made some changes in this area in [0], since the support was primarily to do
redirection from the cpumap prog, so by default we don't install anything now
and only do so if a redirection interface is specified (and use devmap instead).
So this option won't be used anyway going forward (since we don't install a
dummy XDP_PASS program anymore) if it gets accepted.

[0]: https://lore.kernel.org/bpf/20210728165552.435050-1-memxor@gmail.com

PS: I can restore it again if this is something really used beyond redirecting
to another device (i.e. with custom BPF programs). Any feedback would be helpful.

> Fixes: ce4dade7f12a ("samples/bpf: xdp_redirect_cpu: Load a eBPF program on cpumap")
> Signed-off-by: Matthew Cover <matthew.cover@stackpath.com>
> ---
>  samples/bpf/xdp_redirect_cpu_user.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/samples/bpf/xdp_redirect_cpu_user.c b/samples/bpf/xdp_redirect_cpu_user.c
> index d3ecdc1..9e225c9 100644
> --- a/samples/bpf/xdp_redirect_cpu_user.c
> +++ b/samples/bpf/xdp_redirect_cpu_user.c
> @@ -841,7 +841,7 @@ int main(int argc, char **argv)
>  	memset(cpu, 0, n_cpus * sizeof(int));
>
>  	/* Parse commands line args */
> -	while ((opt = getopt_long(argc, argv, "hSd:s:p:q:c:xzFf:e:r:m:",
> +	while ((opt = getopt_long(argc, argv, "hSd:s:p:q:c:xzFf:e:r:m:n",
>  				  long_options, &longindex)) != -1) {
>  		switch (opt) {
>  		case 'd':
> --
> 1.8.3.1
>

--
Kartikeya