netdev - Re: [PATCH bpf-next 6/6] bpftool: add pop and dequeue commands

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Date:   Wed, 16 Jan 2019 08:45:31 -0800
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        quentin.monnet@...ronome.com
Subject: Re: [PATCH bpf-next 6/6] bpftool: add pop and dequeue commands

On 01/15, Jakub Kicinski wrote:
> On Tue, 15 Jan 2019 15:22:52 -0800, Stanislav Fomichev wrote:
> > +static int do_pop_dequeue(int argc, char **argv)
> > +{
> > +	struct bpf_map_info info = {};
> > +	__u32 len = sizeof(info);
> > +	void *key, *value;
> > +	int err;
> > +	int fd;
> > +
> > +	if (argc < 2)
> > +		usage();
> > +
> > +	fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
> > +	if (fd < 0)
> > +		return -1;
> > +
> > +	err = alloc_key_value(&info, &key, &value);
> > +	if (err)
> > +		goto exit_free;
> > +
> > +	err = bpf_map_lookup_and_delete_elem(fd, key, value);
> > +	if (err) {
> > +		if (errno == ENOENT) {
> > +			if (json_output)
> > +				jsonw_null(json_wtr);
> > +			else
> > +				printf("Error: empty map\n");
> > +		} else {
> > +			p_err("pop failed: %s", strerror(errno));
> > +		}
> > +
> > +		goto exit_free;
> > +	}
> > +
> > +	print_key_value(&info, key, value);
> > +
> > +exit_free:
> > +	free(key);
> > +	free(value);
> > +	close(fd);
> > +
> > +	if (!err && json_output)
> > +		jsonw_null(json_wtr);
> 
> These two lines look out of place?
Ah, indeed, sorry about that. Will remove in v2.
> 
> > +	return err;
> > +}