drivers/net/ethernet/rocker/rocker_tlv.c

   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
  19 void 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
  36 int 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 }