1/*
 2 * drivers/net/ethernet/rocker/rocker_tlv.c - Rocker switch device driver
 3 * Copyright (c) 2014-2016 Jiri Pirko <jiri@mellanox.com>
 4 * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License as published by
 8 * the Free Software Foundation; either version 2 of the License, or
 9 * (at your option) any later version.
10 */
11
12#include <linux/types.h>
13#include <linux/string.h>
14#include <linux/errno.h>
15
16#include "rocker_hw.h"
17#include "rocker_tlv.h"
18
19void rocker_tlv_parse(const struct rocker_tlv **tb, int maxtype,
20		      const char *buf, int buf_len)
21{
22	const struct rocker_tlv *tlv;
23	const struct rocker_tlv *head = (const struct rocker_tlv *) buf;
24	int rem;
25
26	memset(tb, 0, sizeof(struct rocker_tlv *) * (maxtype + 1));
27
28	rocker_tlv_for_each(tlv, head, buf_len, rem) {
29		u32 type = rocker_tlv_type(tlv);
30
31		if (type > 0 && type <= maxtype)
32			tb[type] = tlv;
33	}
34}
35
36int rocker_tlv_put(struct rocker_desc_info *desc_info,
37		   int attrtype, int attrlen, const void *data)
38{
39	int tail_room = desc_info->data_size - desc_info->tlv_size;
40	int total_size = rocker_tlv_total_size(attrlen);
41	struct rocker_tlv *tlv;
42
43	if (unlikely(tail_room < total_size))
44		return -EMSGSIZE;
45
46	tlv = rocker_tlv_start(desc_info);
47	desc_info->tlv_size += total_size;
48	tlv->type = attrtype;
49	tlv->len = rocker_tlv_attr_size(attrlen);
50	memcpy(rocker_tlv_data(tlv), data, attrlen);
51	memset((char *) tlv + tlv->len, 0, rocker_tlv_padlen(attrlen));
52	return 0;
53}