LXR linux/drivers/net/ethernet/rocker/rocker

   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}
  54