arch/mips/include/asm/octeon/cvmx-packet.h

   1 /***********************license start***************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2008 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26  ***********************license end**************************************/
  27
  28 /*
  29  * Packet buffer defines.
  30  */
  31
  32 #ifndef __CVMX_PACKET_H__
  33 #define __CVMX_PACKET_H__
  34
  35 /**
  36  * This structure defines a buffer pointer on Octeon
  37  */
  38 union cvmx_buf_ptr {
  39         void *ptr;
  40         uint64_t u64;
  41         struct {
  42 #ifdef __BIG_ENDIAN_BITFIELD
  43                 /* if set, invert the "free" pick of the overall
  44                  * packet. HW always sets this bit to 0 on inbound
  45                  * packet */
  46                 uint64_t i:1;
  47
  48                 /* Indicates the amount to back up to get to the
  49                  * buffer start in cache lines. In most cases this is
  50                  * less than one complete cache line, so the value is
  51                  * zero */
  52                 uint64_t back:4;
  53                 /* The pool that the buffer came from / goes to */
  54                 uint64_t pool:3;
  55                 /* The size of the segment pointed to by addr (in bytes) */
  56                 uint64_t size:16;
  57                 /* Pointer to the first byte of the data, NOT buffer */
  58                 uint64_t addr:40;
  59 #else
  60                 uint64_t addr:40;
  61                 uint64_t size:16;
  62                 uint64_t pool:3;
  63                 uint64_t back:4;
  64                 uint64_t i:1;
  65 #endif
  66         } s;
  67 };
  68
  69 #endif /*  __CVMX_PACKET_H__ */