netdev - Re: [RFC bpf-next 3/4] tools/bpf: bpftool, split the function do

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Date:   Wed, 19 Sep 2018 08:26:17 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC bpf-next 3/4] tools/bpf: bpftool, split the function
 do_dump()

On Wed, 19 Sep 2018 16:51:42 +0900, Prashant Bhole wrote:
> +static int dump_map_elem(int fd, void *key, void *value,
> +			 struct bpf_map_info *map_info, struct btf *btf,
> +			 json_writer_t *btf_wtr)
> +{
> +	int num_elems = 0;
> +
> +	if (!bpf_map_lookup_elem(fd, key, value)) {
> +		if (json_output) {
> +			print_entry_json(map_info, key, value, btf);
> +		} else {
> +			if (btf) {
> +				struct btf_dumper d = {
> +					.btf = btf,
> +					.jw = btf_wtr,
> +					.is_plain_text = true,
> +				};
> +
> +				do_dump_btf(&d, map_info, key, value);
> +			} else {
> +				print_entry_plain(map_info, key, value);
> +			}
> +			num_elems++;
> +		}
> +		goto out;
> +	}
> +
> +	/* lookup error handling */
> +	if (map_is_map_of_maps(map_info->type) ||
> +	    map_is_map_of_progs(map_info->type))
> +		goto out;
> +

nit: why not just return?  the goto seems to only do a return anyway,
     is this suggested by some coding style?  Is it to help the
     compiler?  I see people do this from time to time..

[...]

> +out:
> +	return num_elems;