drivers/scsi/fnic/rq_enet_desc.h

   1 /*
   2  * Copyright 2008 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 #ifndef _RQ_ENET_DESC_H_
  19 #define _RQ_ENET_DESC_H_
  20
  21 /* Ethernet receive queue descriptor: 16B */
  22 struct rq_enet_desc {
  23         __le64 address;
  24         __le16 length_type;
  25         u8 reserved[6];
  26 };
  27
  28 enum rq_enet_type_types {
  29         RQ_ENET_TYPE_ONLY_SOP = 0,
  30         RQ_ENET_TYPE_NOT_SOP = 1,
  31         RQ_ENET_TYPE_RESV2 = 2,
  32         RQ_ENET_TYPE_RESV3 = 3,
  33 };
  34
  35 #define RQ_ENET_ADDR_BITS               64
  36 #define RQ_ENET_LEN_BITS                14
  37 #define RQ_ENET_LEN_MASK                ((1 << RQ_ENET_LEN_BITS) - 1)
  38 #define RQ_ENET_TYPE_BITS               2
  39 #define RQ_ENET_TYPE_MASK               ((1 << RQ_ENET_TYPE_BITS) - 1)
  40
  41 static inline void rq_enet_desc_enc(struct rq_enet_desc *desc,
  42         u64 address, u8 type, u16 length)
  43 {
  44         desc->address = cpu_to_le64(address);
  45         desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
  46                 ((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
  47 }
  48
  49 static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
  50         u64 *address, u8 *type, u16 *length)
  51 {
  52         *address = le64_to_cpu(desc->address);
  53         *length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
  54         *type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
  55                 RQ_ENET_TYPE_MASK);
  56 }
  57
  58 #endif /* _RQ_ENET_DESC_H_ */