drivers/staging/octeon/ethernet-defines.h

   1 /*
   2  * This file is based on code from OCTEON SDK by Cavium Networks.
   3  *
   4  * Copyright (c) 2003-2007 Cavium Networks
   5  *
   6  * This file is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, Version 2, as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 /*
  12  * A few defines are used to control the operation of this driver:
  13  *  USE_ASYNC_IOBDMA
  14  *      Use asynchronous IO access to hardware. This uses Octeon's asynchronous
  15  *      IOBDMAs to issue IO accesses without stalling. Set this to zero
  16  *      to disable this. Note that IOBDMAs require CVMSEG.
  17  *  REUSE_SKBUFFS_WITHOUT_FREE
  18  *      Allows the TX path to free an skbuff into the FPA hardware pool. This
  19  *      can significantly improve performance for forwarding and bridging, but
  20  *      may be somewhat dangerous. Checks are made, but if any buffer is reused
  21  *      without the proper Linux cleanup, the networking stack may have very
  22  *      bizarre bugs.
  23  */
  24 #ifndef __ETHERNET_DEFINES_H__
  25 #define __ETHERNET_DEFINES_H__
  26
  27 #include <asm/octeon/cvmx-config.h>
  28
  29 #ifdef CONFIG_NETFILTER
  30 #define REUSE_SKBUFFS_WITHOUT_FREE  0
  31 #else
  32 #define REUSE_SKBUFFS_WITHOUT_FREE  1
  33 #endif
  34
  35 #define USE_ASYNC_IOBDMA            (CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0)
  36
  37 /* Maximum number of SKBs to try to free per xmit packet. */
  38 #define MAX_OUT_QUEUE_DEPTH 1000
  39
  40 #define FAU_TOTAL_TX_TO_CLEAN (CVMX_FAU_REG_END - sizeof(u32))
  41 #define FAU_NUM_PACKET_BUFFERS_TO_FREE (FAU_TOTAL_TX_TO_CLEAN - sizeof(u32))
  42
  43 #define TOTAL_NUMBER_OF_PORTS       (CVMX_PIP_NUM_INPUT_PORTS+1)
  44
  45 #endif /* __ETHERNET_DEFINES_H__ */