text: /* SPDX-License-Identifier: BSD-3-Clause
   * Copyright 2008-2017 Cisco Systems, Inc.  All rights reserved.
   * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   */
  
  #ifndef _RQ_ENET_DESC_H_
  #define _RQ_ENET_DESC_H_
  
  /* Ethernet receive queue descriptor: 16B */
  struct rq_enet_desc {
  	__le64 address;
  	__le16 length_type;
  	u8 reserved[6];
  };
  
  enum rq_enet_type_types {
  	RQ_ENET_TYPE_ONLY_SOP = 0,
  	RQ_ENET_TYPE_NOT_SOP = 1,
  	RQ_ENET_TYPE_RESV2 = 2,
  	RQ_ENET_TYPE_RESV3 = 3,
  };
  
  #define RQ_ENET_ADDR_BITS		64
  #define RQ_ENET_LEN_BITS		14
  #define RQ_ENET_LEN_MASK		((1 << RQ_ENET_LEN_BITS) - 1)
  #define RQ_ENET_TYPE_BITS		2
  #define RQ_ENET_TYPE_MASK		((1 << RQ_ENET_TYPE_BITS) - 1)
  
  static inline void rq_enet_desc_enc(volatile struct rq_enet_desc *desc,
  	u64 address, u8 type, u16 length)
  {
  	desc->address = cpu_to_le64(address);
  	desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
  		((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
  }
  
  static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
  	u64 *address, u8 *type, u16 *length)
  {
  	*address = le64_to_cpu(desc->address);
  	*length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
  	*type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
  		RQ_ENET_TYPE_MASK);
  }
  
  #endif /* _RQ_ENET_DESC_H_ */
  