Re: [bpf-next PATCH 1/7] bpf: refactor sockmap sample program update for arg parsing

[Jesper Dangaard Brouer <brouer@redhat.com>]

On Mon, 08 Jan 2018 10:05:07 -0800
John Fastabend <john.fastabend@gmail.com> wrote:

> sockmap sample program takes arguments from cmd line but it reads them
> in using offsets into the array. Because we want to add more arguments
> in the future lets do proper argument handling.
> 
> Also refactor code to pull apart sock init and ping/pong test. This
> allows us to add new tests in the future.
> 
> Signed-off-by: John Fastabend <john.fastabend@gmail.com>
> ---
>  samples/sockmap/sockmap_user.c |  142 +++++++++++++++++++++++++++++-----------
>  1 file changed, 103 insertions(+), 39 deletions(-)
> 
> diff --git a/samples/sockmap/sockmap_user.c b/samples/sockmap/sockmap_user.c
> index 7cc9d22..5cbe7a5 100644
> --- a/samples/sockmap/sockmap_user.c
> +++ b/samples/sockmap/sockmap_user.c
> @@ -35,6 +35,8 @@
>  #include <assert.h>
>  #include <libgen.h>
>  
> +#include <getopt.h>
> +
>  #include "../bpf/bpf_load.h"
>  #include "../bpf/bpf_util.h"
>  #include "../bpf/libbpf.h"
> @@ -46,15 +48,39 @@
>  #define S1_PORT 10000
>  #define S2_PORT 10001
>  
> -static int sockmap_test_sockets(int rate, int dot)
> +/* global sockets */
> +int s1, s2, c1, c2, p1, p2;
> +
> +static const struct option long_options[] = {
> +	{"help",	no_argument,		NULL, 'h' },
> +	{"cgroup",	required_argument,	NULL, 'c' },
> +	{"rate",	required_argument,	NULL, 'r' },
> +	{"verbose",	no_argument,		NULL, 'v' },
> +	{0, 0, NULL, 0 }
> +};
> +
> +static void usage(char *argv[])
> +{
> +	int i;
> +
> +	printf(" Usage: %s --cgroup <cgroup_path>\n", argv[0]);
> +	printf(" options:\n");
> +	for (i = 0; long_options[i].name != 0; i++) {
> +		printf(" --%-12s", long_options[i].name);
> +		if (long_options[i].flag != NULL)
> +			printf(" flag (internal value:%d)\n",
> +				*long_options[i].flag);
> +		else
> +			printf(" -%c\n", long_options[i].val);
> +	}
> +	printf("\n");
> +}
> +

I love that you are using --long-options :-)

Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer