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 #include <rte_byteorder.h>
  10
  11 /* Ethernet receive queue descriptor: 16B */
  12 struct rq_enet_desc {
  13         uint64_t address;
  14         uint16_t length_type;
  15         uint8_t reserved[6];
  16 };
  17
  18 enum rq_enet_type_types {
  19         RQ_ENET_TYPE_ONLY_SOP = 0,
  20         RQ_ENET_TYPE_NOT_SOP = 1,
  21         RQ_ENET_TYPE_RESV2 = 2,
  22         RQ_ENET_TYPE_RESV3 = 3,
  23 };
  24
  25 #define RQ_ENET_ADDR_BITS               64
  26 #define RQ_ENET_LEN_BITS                14
  27 #define RQ_ENET_LEN_MASK                ((1 << RQ_ENET_LEN_BITS) - 1)
  28 #define RQ_ENET_TYPE_BITS               2
  29 #define RQ_ENET_TYPE_MASK               ((1 << RQ_ENET_TYPE_BITS) - 1)
  30
  31 static inline void rq_enet_desc_enc(volatile struct rq_enet_desc *desc,
  32         uint64_t address, uint8_t type, uint16_t length)
  33 {
  34         desc->address = rte_cpu_to_le_64(address);
  35         desc->length_type = rte_cpu_to_le_16((length & RQ_ENET_LEN_MASK) |
  36                 ((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
  37 }
  38
  39 static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
  40         uint64_t *address, uint8_t *type, uint16_t *length)
  41 {
  42         *address = rte_le_to_cpu_64(desc->address);
  43         *length = rte_le_to_cpu_16(desc->length_type) & RQ_ENET_LEN_MASK;
  44         *type = (uint8_t)((rte_le_to_cpu_16(desc->length_type) >>
  45                 RQ_ENET_LEN_BITS) & RQ_ENET_TYPE_MASK);
  46 }
  47
  48 #endif /* _RQ_ENET_DESC_H_ */