drivers/net/ethernet/rocker/rocker_tlv.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/net/ethernet/rocker/rocker_tlv.c - Rocker switch device driver
   4  * Copyright (c) 2014-2016 Jiri Pirko <jiri@mellanox.com>
   5  * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/string.h>
  10 #include <linux/errno.h>
  11
  12 #include "rocker_hw.h"
  13 #include "rocker_tlv.h"
  14
  15 void rocker_tlv_parse(const struct rocker_tlv **tb, int maxtype,
  16                       const char *buf, int buf_len)
  17 {
  18         const struct rocker_tlv *tlv;
  19         const struct rocker_tlv *head = (const struct rocker_tlv *) buf;
  20         int rem;
  21
  22         memset(tb, 0, sizeof(struct rocker_tlv *) * (maxtype + 1));
  23
  24         rocker_tlv_for_each(tlv, head, buf_len, rem) {
  25                 u32 type = rocker_tlv_type(tlv);
  26
  27                 if (type > 0 && type <= maxtype)
  28                         tb[type] = tlv;
  29         }
  30 }
  31
  32 int rocker_tlv_put(struct rocker_desc_info *desc_info,
  33                    int attrtype, int attrlen, const void *data)
  34 {
  35         int tail_room = desc_info->data_size - desc_info->tlv_size;
  36         int total_size = rocker_tlv_total_size(attrlen);
  37         struct rocker_tlv *tlv;
  38
  39         if (unlikely(tail_room < total_size))
  40                 return -EMSGSIZE;
  41
  42         tlv = rocker_tlv_start(desc_info);
  43         desc_info->tlv_size += total_size;
  44         tlv->type = attrtype;
  45         tlv->len = rocker_tlv_attr_size(attrlen);
  46         memcpy(rocker_tlv_data(tlv), data, attrlen);
  47         memset((char *) tlv + tlv->len, 0, rocker_tlv_padlen(attrlen));
  48         return 0;
  49 }