drivers/staging/octeon/ethernet-defines.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * This file is based on code from OCTEON SDK by Cavium Networks.
   4  *
   5  * Copyright (c) 2003-2007 Cavium Networks
   6  */
   7
   8 /*
   9  * A few defines are used to control the operation of this driver:
  10  *  USE_ASYNC_IOBDMA
  11  *      Use asynchronous IO access to hardware. This uses Octeon's asynchronous
  12  *      IOBDMAs to issue IO accesses without stalling. Set this to zero
  13  *      to disable this. Note that IOBDMAs require CVMSEG.
  14  *  REUSE_SKBUFFS_WITHOUT_FREE
  15  *      Allows the TX path to free an skbuff into the FPA hardware pool. This
  16  *      can significantly improve performance for forwarding and bridging, but
  17  *      may be somewhat dangerous. Checks are made, but if any buffer is reused
  18  *      without the proper Linux cleanup, the networking stack may have very
  19  *      bizarre bugs.
  20  */
  21 #ifndef __ETHERNET_DEFINES_H__
  22 #define __ETHERNET_DEFINES_H__
  23
  24 #ifdef CONFIG_NETFILTER
  25 #define REUSE_SKBUFFS_WITHOUT_FREE  0
  26 #else
  27 #define REUSE_SKBUFFS_WITHOUT_FREE  1
  28 #endif
  29
  30 #define USE_ASYNC_IOBDMA            (CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0)
  31
  32 /* Maximum number of SKBs to try to free per xmit packet. */
  33 #define MAX_OUT_QUEUE_DEPTH 1000
  34
  35 #define FAU_TOTAL_TX_TO_CLEAN (CVMX_FAU_REG_END - sizeof(u32))
  36 #define FAU_NUM_PACKET_BUFFERS_TO_FREE (FAU_TOTAL_TX_TO_CLEAN - sizeof(u32))
  37
  38 #define TOTAL_NUMBER_OF_PORTS       (CVMX_PIP_NUM_INPUT_PORTS + 1)
  39
  40 #endif /* __ETHERNET_DEFINES_H__ */