drivers/net/ethernet/cisco/enic/rq_enet_desc.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   5  */
   6
   7 #ifndef _RQ_ENET_DESC_H_
   8 #define _RQ_ENET_DESC_H_
   9
  10 /* Ethernet receive queue descriptor: 16B */
  11 struct rq_enet_desc {
  12         __le64 address;
  13         __le16 length_type;
  14         u8 reserved[6];
  15 };
  16
  17 enum rq_enet_type_types {
  18         RQ_ENET_TYPE_ONLY_SOP = 0,
  19         RQ_ENET_TYPE_NOT_SOP = 1,
  20         RQ_ENET_TYPE_RESV2 = 2,
  21         RQ_ENET_TYPE_RESV3 = 3,
  22 };
  23
  24 #define RQ_ENET_ADDR_BITS               64
  25 #define RQ_ENET_LEN_BITS                14
  26 #define RQ_ENET_LEN_MASK                ((1 << RQ_ENET_LEN_BITS) - 1)
  27 #define RQ_ENET_TYPE_BITS               2
  28 #define RQ_ENET_TYPE_MASK               ((1 << RQ_ENET_TYPE_BITS) - 1)
  29
  30 static inline void rq_enet_desc_enc(struct rq_enet_desc *desc,
  31         u64 address, u8 type, u16 length)
  32 {
  33         desc->address = cpu_to_le64(address);
  34         desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
  35                 ((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
  36 }
  37
  38 static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
  39         u64 *address, u8 *type, u16 *length)
  40 {
  41         *address = le64_to_cpu(desc->address);
  42         *length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
  43         *type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
  44                 RQ_ENET_TYPE_MASK);
  45 }
  46
  47 #endif /* _RQ_ENET_DESC_H_ */