kernel/drivers/staging/octeon/ethernet-rx.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 #include <asm/octeon/cvmx-fau.h>
  12
  13 void cvm_oct_poll_controller(struct net_device *dev);
  14 void cvm_oct_rx_initialize(void);
  15 void cvm_oct_rx_shutdown(void);
  16
  17 static inline void cvm_oct_rx_refill_pool(int fill_threshold)
  18 {
  19         int number_to_free;
  20         int num_freed;
  21         /* Refill the packet buffer pool */
  22         number_to_free =
  23                 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
  24
  25         if (number_to_free > fill_threshold) {
  26                 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
  27                                       -number_to_free);
  28                 num_freed = cvm_oct_mem_fill_fpa(CVMX_FPA_PACKET_POOL,
  29                                                  CVMX_FPA_PACKET_POOL_SIZE,
  30                                                  number_to_free);
  31                 if (num_freed != number_to_free) {
  32                         cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
  33                                         number_to_free - num_freed);
  34                 }
  35         }
  36 }