drivers/net/enic/base/rq_enet_desc.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2008-2017 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  */
   5
   6 #ifndef _RQ_ENET_DESC_H_
   7 #define _RQ_ENET_DESC_H_
   8
   9 /* Ethernet receive queue descriptor: 16B */
  10 struct rq_enet_desc {
  11         __le64 address;
  12         __le16 length_type;
  13         u8 reserved[6];
  14 };
  15
  16 enum rq_enet_type_types {
  17         RQ_ENET_TYPE_ONLY_SOP = 0,
  18         RQ_ENET_TYPE_NOT_SOP = 1,
  19         RQ_ENET_TYPE_RESV2 = 2,
  20         RQ_ENET_TYPE_RESV3 = 3,
  21 };
  22
  23 #define RQ_ENET_ADDR_BITS               64
  24 #define RQ_ENET_LEN_BITS                14
  25 #define RQ_ENET_LEN_MASK                ((1 << RQ_ENET_LEN_BITS) - 1)
  26 #define RQ_ENET_TYPE_BITS               2
  27 #define RQ_ENET_TYPE_MASK               ((1 << RQ_ENET_TYPE_BITS) - 1)
  28
  29 static inline void rq_enet_desc_enc(volatile struct rq_enet_desc *desc,
  30         u64 address, u8 type, u16 length)
  31 {
  32         desc->address = cpu_to_le64(address);
  33         desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
  34                 ((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
  35 }
  36
  37 static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
  38         u64 *address, u8 *type, u16 *length)
  39 {
  40         *address = le64_to_cpu(desc->address);
  41         *length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
  42         *type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
  43                 RQ_ENET_TYPE_MASK);
  44 }
  45
  46 #endif /* _RQ_ENET_DESC_H_ */