LXR linux/drivers/net/ethernet/cisco/enic/rq_enet

   1/*
   2 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   3 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4 *
   5 * This program is free software; you may redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; version 2 of the License.
   8 *
   9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16 * SOFTWARE.
  17 *
  18 */
  19
  20#ifndef _RQ_ENET_DESC_H_
  21#define _RQ_ENET_DESC_H_
  22
  23/* Ethernet receive queue descriptor: 16B */
  24struct rq_enet_desc {
  25        __le64 address;
  26        __le16 length_type;
  27        u8 reserved[6];
  28};
  29
  30enum rq_enet_type_types {
  31        RQ_ENET_TYPE_ONLY_SOP = 0,
  32        RQ_ENET_TYPE_NOT_SOP = 1,
  33        RQ_ENET_TYPE_RESV2 = 2,
  34        RQ_ENET_TYPE_RESV3 = 3,
  35};
  36
  37#define RQ_ENET_ADDR_BITS               64
  38#define RQ_ENET_LEN_BITS                14
  39#define RQ_ENET_LEN_MASK                ((1 << RQ_ENET_LEN_BITS) - 1)
  40#define RQ_ENET_TYPE_BITS               2
  41#define RQ_ENET_TYPE_MASK               ((1 << RQ_ENET_TYPE_BITS) - 1)
  42
  43static inline void rq_enet_desc_enc(struct rq_enet_desc *desc,
  44        u64 address, u8 type, u16 length)
  45{
  46        desc->address = cpu_to_le64(address);
  47        desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
  48                ((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
  49}
  50
  51static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
  52        u64 *address, u8 *type, u16 *length)
  53{
  54        *address = le64_to_cpu(desc->address);
  55        *length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
  56        *type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
  57                RQ_ENET_TYPE_MASK);
  58}
  59
  60#endif /* _RQ_ENET_DESC_H_ */
  61