drivers/net/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, u8 *oui, u8 type)
  27 {
  28         struct vic_provinfo *vp;
  29
  30         if (!oui)
  31                 return NULL;
  32
  33         vp = kzalloc(VIC_PROVINFO_MAX_DATA, flags);
  34         if (!vp)
  35                 return NULL;
  36
  37         memcpy(vp->oui, oui, sizeof(vp->oui));
  38         vp->type = type;
  39         vp->length = htonl(sizeof(vp->num_tlvs));
  40
  41         return vp;
  42 }
  43
  44 void vic_provinfo_free(struct vic_provinfo *vp)
  45 {
  46         kfree(vp);
  47 }
  48
  49 int vic_provinfo_add_tlv(struct vic_provinfo *vp, u16 type, u16 length,
  50         void *value)
  51 {
  52         struct vic_provinfo_tlv *tlv;
  53
  54         if (!vp || !value)
  55                 return -EINVAL;
  56
  57         if (ntohl(vp->length) + offsetof(struct vic_provinfo_tlv, value) +
  58                 length > VIC_PROVINFO_MAX_TLV_DATA)
  59                 return -ENOMEM;
  60
  61         tlv = (struct vic_provinfo_tlv *)((u8 *)vp->tlv +
  62                 ntohl(vp->length) - sizeof(vp->num_tlvs));
  63
  64         tlv->type = htons(type);
  65         tlv->length = htons(length);
  66         memcpy(tlv->value, value, length);
  67
  68         vp->num_tlvs = htonl(ntohl(vp->num_tlvs) + 1);
  69         vp->length = htonl(ntohl(vp->length) +
  70                 offsetof(struct vic_provinfo_tlv, value) + length);
  71
  72         return 0;
  73 }
  74
  75 size_t vic_provinfo_size(struct vic_provinfo *vp)
  76 {
  77         return vp ?  ntohl(vp->length) + sizeof(*vp) - sizeof(vp->num_tlvs) : 0;
  78 }