drivers/net/ethernet/cisco/enic/vnic_vic.c

   1 /*
   2  * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/errno.h>
  21 #include <linux/types.h>
  22 #include <linux/slab.h>
  23
  24 #include "vnic_vic.h"
  25
  26 struct vic_provinfo *vic_provinfo_alloc(gfp_t flags, const u8 *oui,
  27         const u8 type)
  28 {
  29         struct vic_provinfo *vp;
  30
  31         if (!oui)
  32                 return NULL;
  33
  34         vp = kzalloc(VIC_PROVINFO_MAX_DATA, flags);
  35         if (!vp)
  36                 return NULL;
  37
  38         memcpy(vp->oui, oui, sizeof(vp->oui));
  39         vp->type = type;
  40         vp->length = htonl(sizeof(vp->num_tlvs));
  41
  42         return vp;
  43 }
  44
  45 void vic_provinfo_free(struct vic_provinfo *vp)
  46 {
  47         kfree(vp);
  48 }
  49
  50 int vic_provinfo_add_tlv(struct vic_provinfo *vp, u16 type, u16 length,
  51         const void *value)
  52 {
  53         struct vic_provinfo_tlv *tlv;
  54
  55         if (!vp || !value)
  56                 return -EINVAL;
  57
  58         if (ntohl(vp->length) + offsetof(struct vic_provinfo_tlv, value) +
  59                 length > VIC_PROVINFO_MAX_TLV_DATA)
  60                 return -ENOMEM;
  61
  62         tlv = (struct vic_provinfo_tlv *)((u8 *)vp->tlv +
  63                 ntohl(vp->length) - sizeof(vp->num_tlvs));
  64
  65         tlv->type = htons(type);
  66         tlv->length = htons(length);
  67         memcpy(tlv->value, value, length);
  68
  69         vp->num_tlvs = htonl(ntohl(vp->num_tlvs) + 1);
  70         vp->length = htonl(ntohl(vp->length) +
  71                 offsetof(struct vic_provinfo_tlv, value) + length);
  72
  73         return 0;
  74 }
  75
  76 size_t vic_provinfo_size(struct vic_provinfo *vp)
  77 {
  78         return vp ?  ntohl(vp->length) + sizeof(*vp) - sizeof(vp->num_tlvs) : 0;
  79 }