ethernet/rocker/rocker_tlv.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * drivers/net/ethernet/rocker/rocker_tlv.c - Rocker switch device driver
0004  * Copyright (c) 2014-2016 Jiri Pirko <jiri@mellanox.com>
0005  * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>
0006  */
0007
0008 #include <linux/types.h>
0009 #include <linux/string.h>
0010 #include <linux/errno.h>
0011
0012 #include "rocker_hw.h"
0013 #include "rocker_tlv.h"
0014
0015 void rocker_tlv_parse(const struct rocker_tlv **tb, int maxtype,
0016               const char *buf, int buf_len)
0017 {
0018     const struct rocker_tlv *tlv;
0019     const struct rocker_tlv *head = (const struct rocker_tlv *) buf;
0020     int rem;
0021
0022     memset(tb, 0, sizeof(struct rocker_tlv *) * (maxtype + 1));
0023
0024     rocker_tlv_for_each(tlv, head, buf_len, rem) {
0025         u32 type = rocker_tlv_type(tlv);
0026
0027         if (type > 0 && type <= maxtype)
0028             tb[type] = tlv;
0029     }
0030 }
0031
0032 int rocker_tlv_put(struct rocker_desc_info *desc_info,
0033            int attrtype, int attrlen, const void *data)
0034 {
0035     int tail_room = desc_info->data_size - desc_info->tlv_size;
0036     int total_size = rocker_tlv_total_size(attrlen);
0037     struct rocker_tlv *tlv;
0038
0039     if (unlikely(tail_room < total_size))
0040         return -EMSGSIZE;
0041
0042     tlv = rocker_tlv_start(desc_info);
0043     desc_info->tlv_size += total_size;
0044     tlv->type = attrtype;
0045     tlv->len = rocker_tlv_attr_size(attrlen);
0046     memcpy(rocker_tlv_data(tlv), data, attrlen);
0047     memset((char *) tlv + tlv->len, 0, rocker_tlv_padlen(attrlen));
0048     return 0;
0049 }